JP4626617B2 - Window comparator device - Google Patents

Description

  The present invention relates to a window comparator that determines whether or not a voltage value of an input signal falls within a predetermined range.

  As this type of window comparator, for example, a technique described in Non-Patent Document 1 is known. A conventionally known window comparator including the technique described in this document will be described with reference to FIG.

  As shown in FIG. 4, the window comparator 100 basically includes a constant voltage source Vcc set to a constant voltage, and sequentially connected in series to the constant voltage source Vcc so that an upper limit voltage value “Va” within a predetermined range. And the resistors 111 to 103 that generate the lower limit voltage value “Vb” and the comparator 111 that compares the voltage value of the input signal input to the inverting input terminal and the upper limit voltage value Va input to the non-inverting input terminal. And a comparator 112 that compares the voltage value of the input signal input to the inverting input terminal with the lower limit voltage value Vb input to the non-inverting input terminal.

The window comparator 100 configured as described above, more precisely, has a voltage value “Vs” smaller than the upper limit voltage value “Va” and larger than the lower limit voltage value “Vb” for the comparators 111 and 112. When each of the input signals is applied, the voltage “Va” applied to the non-inverting input terminal of the comparator 111 is larger than the voltage value “Vs” applied to the inverting input terminal. Thus, a voltage having a magnitude corresponding to the logic Hi level is output. Further, since the voltage value “Vs” applied to the inverting input terminal of the comparator 112 is larger than the voltage “Vb” applied to the non-inverting input terminal, it corresponds to the logic Lo level from the comparator 112 via the terminal 122. A voltage of the specified magnitude is output. Therefore, when the voltage corresponding to the logic Hi level and the voltage value corresponding to the logic Lo level are output from the comparators 111 and 112, respectively, it can be determined that the voltage value of the input signal is within a predetermined range. it can.
Design of regular OP circuit, 1990, QC publisher

  For example, to automatically adjust the temperature inside the engine room to a desired range, first, a temperature sensor whose output value changes in accordance with the temperature change is disposed in the engine room, and the conventional window comparator is installed. It is used to determine whether or not the sensor output value of the temperature sensor falls within a desired range, that is, whether or not the temperature inside the engine room falls within the desired range. When it is determined that the sensor output value of the temperature sensor (that is, the temperature inside the engine room) exceeds the upper limit of the desired range, for example, a fan disposed inside the engine room is driven. As a result, the air inside the engine room is forcibly replaced with the outside air, and the temperature inside the engine room is automatically adjusted so that it falls within a desired range.

  In order to carry out such temperature regulation inside the engine room more precisely, multiple reference voltage values are set outside the desired range, and the fan is driven in accordance with how the sensor output value reaches the set reference voltage value. It is possible to do. That is, for example, when it is determined that the sensor output value of the temperature sensor reaches only a reference voltage value that is slightly above the upper limit value of the desired range, the fan is driven at a low speed. On the other hand, when it is determined that the sensor output value of the temperature sensor reaches a reference voltage that greatly exceeds the upper limit value of the desired range, the fan is driven at high speed. This can be considered. Since the desired range is also actually determined by the upper limit voltage value and the lower limit voltage value, it can be identified with the plurality of reference voltage values.

  In this way, it is necessary to set a plurality of reference voltage values for the sensor output values of the temperature sensor and determine how to reach the plurality of reference voltage values. For this purpose, it is necessary to use a large number of comparators for comparing the sensor output value of the temperature sensor and a plurality of reference voltage values.

  However, in general, the comparator has hysteresis, and due to this hysteresis, there is a concern that the determination accuracy for determining the manner of reaching the plurality of reference voltage values may deteriorate.

  In order to reduce the hysteresis of the comparator in order to increase this specific accuracy, it is necessary to mount a correction circuit that corrects the hysteresis in addition to the comparator, and if the correction circuit is not miniaturized, the correction circuit This leads to an increase in the size of the comparator including the. In addition, since many such comparators are used, the size of the window comparator device is increased.

  Note that this situation is not limited to the case where the temperature inside the engine room is to be automatically adjusted precisely to a desired range, but to determine the manner in which the voltage value of the input signal reaches a plurality of set reference voltage values. In some cases, it is generally possible.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a window comparator device capable of reducing the size of the physique while improving the determination accuracy related to the magnitude of the voltage value of the input signal. Is to provide.

  In order to achieve such an object, in the invention described in claim 1, as a window comparator device that determines the magnitude of the voltage value of the input signal through a comparison between a plurality of different reference voltage values and the voltage value of the input signal, A reference voltage value generation unit configured to generate the plurality of reference voltage values; a reference voltage value used as a determination value of the determination comparator among the plurality of reference voltage values; and a voltage value of the input signal. A comparison comparator for comparison, a switching comparator for comparing a reference voltage value used as a threshold of the switching comparator among the plurality of reference voltage values and a voltage value of the input signal, and the reference An analog switch interposed between the voltage value generation unit and the determination comparator, and based on the comparison result of the switching comparator, through the analog switch, the A switch circuit that switches a determination value of the regular comparator, and a determination unit that determines the magnitude of the voltage value of the input signal based on the comparison result of the determination comparator and the comparison result of the switching comparator. I decided to prepare.

  In such a configuration as the window comparator device, first, in the switching comparator, the reference voltage value used as a threshold value among the plurality of reference voltage values generated by the reference voltage value generation unit and the voltage of the input signal The value is compared. Based on the comparison result of the switching comparator, the determination value of the determination comparator is switched through the switch circuit. The judgment value thus switched and the voltage value of the input signal are compared in the judgment comparator, and through the judgment means, the voltage of the input signal is based on the comparison result of the judgment comparator and the comparison result of the switching comparator. The magnitude of the value will be determined. As a result, since the determination value of the determination comparator is switched using the switch circuit, the voltage value of the input signal can be compared with a large number of determination values with a single determination comparator. That is, the window comparator device does not need to include a comparator for determination in addition to the determination value, so that the number of comparators can be reduced. Since the number of comparators can be reduced, the number of correction circuits and the like for correcting the hysteresis of the comparators can be reduced, and the size of the window comparator device can be reduced. Will be able to.

  Further, in the configuration according to claim 1, for example, in the invention according to claim 2, the determination comparator is configured by two of a first determination comparator and a second determination comparator, As the first determination value that is the determination value of the first determination comparator, the larger reference voltage value of the two adjacent reference voltage values is set, and the determination value of the second determination comparator is A smaller reference voltage value of the two adjacent reference voltage values is set as a second determination value, and the switch circuit determines the first determination value based on a comparison result of the switching comparator. And the second determination value are switched at once, and the determination unit is configured to switch the input signal based on a comparison result of the first and second determination comparators and a comparison result of the switching comparator. The magnitude of the voltage value was determined.

  In such a configuration as a window comparator device, first, in the switching comparator, among the plurality of reference voltage values generated by the reference voltage value generation unit, similarly to the configuration described in claim 1 above. The reference voltage value used as the threshold value is compared with the voltage value of the input signal. Based on the comparison result of the switching comparator, the first determination value of the first determination comparator and the second determination value of the second determination comparator are collectively switched through the switch circuit. The first and second determination values thus switched and the voltage value of the input signal are compared in the first and second determination comparators, respectively, and the comparison result of the first and second determination comparators is determined through the determination means. In addition, the magnitude of the voltage of the input signal is determined based on the comparison result of the switching comparator.

  According to such a configuration, if the first determination comparator, the second determination comparator, and the “N (number)” switching comparator are used, that is, the “N + 2 (number)” comparator can be used. For example, it is possible to determine how to reach the reference voltage value of “(N + 1) × 2 + N (pieces)” at the maximum. On the other hand, according to the conventional window comparator described in the background art column, a comparator is required for each determination value. Therefore, even if an “N + 2 (piece)” comparator is used, “N + 2 (piece)” It is only possible to determine how the reference voltage value is reached. Therefore, according to the above configuration as the window comparator device, it is possible to reduce the number of comparators in determining the manner of reaching the same number of reference voltage values.

  In the configuration of the second aspect, the threshold voltage of the switching comparator is set to a reference voltage value different from the first determination value and the second determination value, for example, as in the third aspect of the invention. It is most desirable to reduce the number of comparators.

  Specifically, in the configuration according to the third aspect, the switching comparator is composed of one comparator as in the invention according to the fourth aspect, for example, and the reference voltage value generation unit is different. In addition to generating five reference voltage values, these five reference voltage values are in order of magnitude: “first set of first determination values → first set of second determination values → threshold → second The first determination value of the set → the second determination value of the second set ”, and the switch circuit obtains a comparison result that the voltage value of the input signal is larger than the threshold value through the switching comparator. The first set of first decision values as the decision value of the first decision comparator, and the first set of second decision values as the decision value of the second decision comparator, respectively. And the voltage value of the input signal is smaller than the threshold value. When the comparison result is obtained, the second set of first determination values as the determination value of the first determination comparator and the second set of second determination as the determination value of the second determination comparator are obtained. It is good also as switching to a value collectively. As a result, in the conventional technique described in the background art section, “four” comparators are required. However, in the above configuration, the comparator can be configured with “three” comparators. “1” can be reduced.

  Further, in the configuration described in claim 3, as in the invention described in claim 5, for example, the switching comparator is configured by two of a first switching comparator and a second switching comparator. The reference voltage value generation unit generates eight different reference voltage values, and each of the eight reference voltage values is “first set of first determination value → first set” in order of magnitude. Second determination value → first threshold → second set of first determination value → second set of second determination value → second threshold value → third set of first determination value → third set of second determination value ” When the comparison result that the voltage value of the input signal is larger than the first threshold is obtained through the switching comparator, the switch circuit determines the determination value of the first determination comparator. As the first determination value of the first set, the second determination value of the first set as the determination value of the second determination comparator When the comparison result that the voltage value of the input signal is smaller than the first threshold and larger than the second threshold is obtained, the determination by the first determination comparator is performed. The value is switched to the first determination value of the second set as a value, and the second determination value of the second set as the determination value of the second determination comparator, and the voltage value of the input signal is changed to the first value. When a comparison result indicating that the threshold value is smaller than two threshold values is obtained, the first determination value of the first determination comparator is the first determination value of the third set, and the second determination comparator is the determination value of the second determination value. It was decided to switch to three sets of second judgment values in a lump. As a result, in the conventional technique described in the background art section, “6” comparators are necessary. However, in the above configuration, the comparator can be configured with “4” comparators. "2" can be reduced.

  Further, in the configuration according to claim 3, as in the invention according to claim 6, for example, the switching comparator includes three first to third switching comparators, and the reference voltage The value generator generates eleven different reference voltage values, and each of the eleven reference voltage values is “first set of first determination values → first set of second determination values” in order of magnitude. Value → first threshold → second set of first determination value → second set of second determination value → second threshold value → third set of first determination value → third set of second determination value → third threshold value → The fourth set of first determination values → the fourth set of second determination values ”, and the switch circuit indicates that the voltage value of the input signal is greater than the first threshold value through the switching comparator. When a comparison result is obtained, the first determination value of the first set is used as the determination value of the first determination comparator. A comparison that the voltage value of the input signal is smaller than the first threshold and larger than the second threshold is collectively switched to the second determination value of the first set as the judgment value of the comparator. When the result is obtained, the determination value of the first determination comparator is set to the second set of first determination values, and the determination value of the second determination comparator is set to the second set of second determination values. When the comparison result that the voltage value of the input signal is smaller than the second threshold and larger than the third threshold is obtained, the determination by the first determination comparator is performed. The value is switched to the first determination value of the third set as a value, and the second determination value of the third set as the determination value of the second determination comparator, and the voltage value of the input signal is changed to the first determination value. When a comparison result indicating that the threshold value is smaller than 4 is obtained, the first determination ratio The first determined value of the fourth set as the determination value of vessel, the Second second determined value of the fourth set as the determination value of the determination comparator, and a switching collectively respectively. As a result, in the conventional technique described in the background art section, “8” comparators are required. However, in the above configuration, since it can be configured with “5” comparators, "3" can be reduced.

  In the above configuration, as in the invention of claim 7, for example, the reference voltage value generation unit includes a constant voltage source that outputs a voltage of a predetermined value, and a plurality of resistors that are directly connected to the constant voltage source. It is good also as having. As a result, the window comparator device can be configured more simply.

(First embodiment)
A window comparator device according to a first embodiment of the present invention will be described below with reference to FIG. FIG. 1 is an equivalent circuit diagram of the window comparator device of the present embodiment.

  As shown in FIG. 1 and as will be described in detail below, the window comparator device 1 of the present embodiment includes a (first) determination comparator BC1 and a (second) determination comparator BC2, In addition, a total of three comparators, one switching comparator SC11, are provided, and the magnitude of the voltage value Vs of the input signal input via the input terminal In1 is compared with five reference voltage values. I am trying to judge.

  As shown in FIG. 1, the window comparator device 1 of the present embodiment includes a constant voltage source Vcc that generates a constant voltage of, for example, “5 V”, and, for example, “80 kΩ” sequentially connected in series to the constant voltage source Vcc. A plurality of resistors R11 to R16 having an electrical resistance value of Here, since the resistors R11 to R16 have the same electric resistance value and are connected in series to the constant voltage source Vcc, the reference voltage values “V11” to “V15” at the terminals T11 to T15 between these resistors. The constant voltage of the constant voltage source Vcc is equally divided. That is, these reference voltage values have a relationship of “V11> V12> V13> V14> V15”.

  The terminal T11 between the resistors R11 and R12 is connected to the non-inverting input terminal of the determination comparator BC1 via the analog switch AS11, and between the resistor R12 and the resistor R13. The terminal T12 is connected to the non-inverting input terminal of the determination comparator BC2 via the analog switch AS12. Here, for example, when the analog switches AS11 and AS12 are in a closed state, the reference voltage value “V11” at the terminal T11 is applied to the non-inverting input terminal of the determination comparator BC1, and the reference voltage value “at the terminal T12”. V12 "is applied to the non-inverting input terminal of the comparator for judgment BC2. In this way, the reference voltage value “V11” is used as the (first set of first) determination values of the determination comparator BC1, and the reference voltage value is used as the (first set of second) determination values of the determination comparator BC2. “V12” is set.

  A terminal T14 between the resistors R14 and R15 is connected to the non-inverting input terminal of the comparator for judgment BC1 via the analog switch AS13, and between the resistors R15 and R16. The intermediate terminal T15 is connected to the non-inverting input terminal of the determination comparator BC2 via the analog switch AS14. Here, for example, when the analog switches AS13 and AS14 are in a closed state, the reference voltage value “V14” at the terminal T14 is applied to the non-inverting input terminal of the comparator BC1 and the reference voltage value at the terminal T15. “V15” is applied to the non-inverting input terminal of the comparator for judgment BC2. In this way, the reference voltage value “V14” is used as the (second set of first) determination values of the determination comparator BC1, and the reference voltage value is used as the (second set of second) determination values of the determination comparator BC2. “V15” is set.

  Further, the terminal T13 between the resistors R13 and R14 is connected to the non-inverting input terminal of the switching comparator SC11, and the reference voltage value “V13” at the terminal T13 is changed to the switching comparator SC11. It is a threshold value.

  In this way, the constant voltage source Vcc and the resistors R11 to R16 constitute a reference voltage value generation unit that generates a plurality of different reference voltage values “V11 to V15”.

  On the other hand, as shown in FIG. 1, an input terminal In1 for applying an input signal to the window comparator device 1 is an inverting input terminal of each of the determination comparator BC1, the determination comparator BC2, and the switching comparator SC11. It is connected to the. Among these, the output terminal of the switching comparator SC11 is further connected to the analog switches AS11 and AS12, and connected to the analog switches AS13 and AS14 via the inverter In11 that inverts the input logical output value, respectively. Has been. In this way, the analog switches AS11 to AS14 and the inverter 11 constitute a switch circuit that switches the determination values of the determination comparators BC1 and BC2 based on the comparison result of the switching comparator SC11.

  Further, the window comparator device 1 includes a determination microcomputer (determination means) 10. As shown in FIG. 1, the determination microcomputer 10 is connected to determination comparators BC1 and BC2 and a switching comparator SC11 via output terminals Out11 to 13, respectively. Then, the determination microcomputer 10 uses the determination comparators BC11 and BC12 and the switching comparator as digital information (comparison results) consisting of a voltage value corresponding to the logic Hi level and a voltage value corresponding to the logic Lo level. The magnitude of the voltage value Vs of the input signal inputted through the input terminal In1 is judged based on the digital information fetched from the SC11 and taken from the judgment comparators BC11 and BC12 and the switching comparator SC11.

  When an input signal is applied to the input terminal In1 of the window comparator device 1 configured as described above, for example, with a voltage value “Vs” larger than the reference voltage value “V13”, first, a switching comparator. Through SC11, the reference voltage value “V11” as the determination value of the determination comparator BC1 and the reference voltage value “V12” as the determination value of the determination comparator BC2 are collectively switched.

  Specifically, the switching comparator SC11 compares the voltage value “Vs” of the input signal applied to the inverting input terminal with the reference voltage value “V13” applied to the non-inverting input terminal. Here, since the voltage value “Vs” of the input signal applied to the inverting input terminal is larger than the reference voltage value “V13” applied to the non-inverting input terminal, the voltage corresponding to the logic Lo level is changed. Output from SC11. That is, the voltage value at the output terminal Out3 is a voltage value corresponding to the logic Lo level. When the voltage corresponding to the logic Lo level is output from the switching comparator SC11 in this way, the voltage corresponding to the logic Lo level is applied to the analog switches AS11 and AS12, so that the analog switches AS11 and AS12 are closed and the determination is made. The reference voltage value “V11” is applied to the non-inverting input terminal of the comparator BC1, and the reference voltage value “V12” is applied to the non-inverting input terminal of the determination comparator BC2. On the other hand, when the voltage corresponding to the logic Lo level is output from the switching comparator SC11, the logic level is inverted by the inverter In11, and the voltage corresponding to the logic Hi level is applied to the analog switches AS13 and AS14. When such a voltage is applied to the analog switches AS13 and AS14, the analog switches AS13 and AS14 will remain open. As described above, the switching comparator SC11 switches to the reference voltage value “V11” as the determination value of the determination comparator BC1, and switches to the reference voltage value “V12” as the determination value of the determination comparator BC2.

  Then, the determination comparator BC1 compares the voltage value “Vs” of the input signal applied to the inverting input terminal with the reference voltage value “V11” applied to the non-inverting input terminal. In addition, the determination comparator BC2 compares the voltage value “Vs” of the input signal applied to the inverting input terminal with the reference voltage value “V12” applied to the non-inverting input terminal.

  Here, when the voltage value “Vs” of the input signal applied to the input terminal In1 is larger than the reference voltage value “V11”, the voltage value “Vs” applied to the inverting input terminal of the comparator BC1 for determination. Is larger than the reference voltage value “V11” applied to the non-inverting input terminal of the determination comparator BC1, and therefore, a voltage having a magnitude corresponding to the logic Lo level is output from the determination comparator BC1. That is, the voltage at the output terminal Out11 has a voltage value corresponding to the logic Lo level. Similarly, since the voltage value “Vs” applied to the inverting input terminal of the determination comparator BC2 is larger than the reference voltage value “V12” applied to the non-inverting input terminal of the determination comparator BC2, the logic Lo A voltage having a magnitude corresponding to the level is output from the determination comparator BC2. That is, the voltage at the output terminal Out12 has a voltage value corresponding to the logic Lo level. Therefore, in the determination microcomputer 10, the voltage values at the output terminals Out11 and Out12 are both voltage values corresponding to the logic Lo level, and the voltage value at the output terminal Out13 is equal to the logic Lo level. It can be determined that the voltage value of the input signal applied to the window comparator device 1 (more precisely, the input terminal In1) is larger than the reference voltage value “V11”.

  On the other hand, when the voltage value “Vs” of the input signal applied to the input terminal In1 is smaller than the reference voltage value “V11” and larger than the reference voltage value “V12”, the determination comparator BC1 is not turned on. Since the reference voltage value “V11” applied to the inverting input terminal is larger than the voltage value “Vs” applied to the inverting input terminal of the comparator for determination BC1, a voltage having a magnitude corresponding to the logic Hi level is determined. Output from the comparator BC1. That is, the voltage at the output terminal Out11 has a voltage value corresponding to the logic Hi level. However, since the voltage value “Vs” applied to the inverting input terminal of the judgment comparator BC2 is larger than the reference voltage value “V12” applied to the non-inverting input terminal of the judgment comparator BC2, the voltage level becomes the logic Lo level. A voltage having a corresponding magnitude is output from the comparator for judgment BC1. That is, the voltage at the output terminal Out12 has a voltage value corresponding to the logic Lo level. Accordingly, in the determination microcomputer 10, the voltage value at the output terminal Out11 is a voltage value having a magnitude corresponding to the logic Hi level, and the voltage values at the output terminals Out12 and Out13 are having a magnitude corresponding to the logic Lo level. When it is a voltage value, it is determined that the voltage value of the input signal applied to the window comparator device 1 (more precisely, the input terminal In1) falls within the reference value voltages “V11” and “V12”. be able to.

  On the other hand, when the voltage value “Vs” of the input signal applied to the input terminal In1 is smaller than the reference voltage value “V12”, the reference voltage value “V11” applied to the non-inverting input terminal of the determination comparator BC1. ”Is larger than the voltage value“ Vs ”applied to the inverting input terminal of the determination comparator BC1, a voltage having a magnitude corresponding to the logic Hi level is output from the determination comparator BC1. That is, the voltage at the output terminal Out11 has a voltage value corresponding to the logic Hi level. Similarly, since the reference voltage value “V12” applied to the non-inverting input terminal of the determination comparator BC2 is larger than the voltage value “Vs” applied to the inverting input terminal of the determination comparator BC2, the logic Hi level is set. Is output from the comparator for judgment BC2. That is, the voltage at the output terminal Out12 has a voltage value corresponding to the logic Hi level. Therefore, in the determination microcomputer 10, the voltage values at the output terminals Out11 and Out12 are both voltage values corresponding to the logic Hi level, and the voltage value at the output terminal Out13 is equal to the logic Lo level. It is determined that the voltage value of the input signal applied to the window comparator device 1 (more precisely, the input terminal In1) falls within the reference voltage values “V12” and “V13”. can do.

  Further, when an input signal is applied to the input terminal In1 of the window comparator device 1 configured as described above, for example, with a voltage value “Vs” smaller than the reference voltage value “V13”, first, for switching Through the comparator SC11, the reference voltage value “V14” is switched as a determination value of the determination comparator BC1 and the reference voltage value “V15” is switched as a determination value of the determination comparator BC2.

  Specifically, the switching comparator SC11 compares the voltage value “Vs” of the input signal applied to the inverting input terminal with the reference voltage value “V13” applied to the non-inverting input terminal. Here, since the reference voltage value “V13” applied to the non-inverting input terminal is larger than the voltage value “Vs” of the input signal applied to the inverting input terminal, the voltage corresponding to the logic Hi level is the switching comparator. Output from SC11. That is, the voltage value at the output terminal Out3 is a voltage value corresponding to the logic Hi level. When the voltage corresponding to the logic Hi level is output from the switching comparator SC11 in this way, the voltage corresponding to the logic Hi level is applied to the analog switches AS11 and AS12. When such a voltage is applied to the analog switches AS11 and AS12, the analog switches AS11 and AS12 are opened. On the other hand, when the voltage corresponding to the logic Hi level is output from the switching comparator SC11, the logic level is inverted by the inverter In11, and the voltage corresponding to the logic Lo level is applied to the analog switches AS13 and AS14. Since the voltage corresponding to the logic Lo level is applied to the analog switches AS13 and AS14, the analog switches AS13 and AS14 are closed, and the reference voltage value “V14” is applied to the non-inverting input terminal of the determination comparator BC1. At the same time, the reference voltage value “V15” is applied to the non-inverting input terminal of the comparator BC2. As described above, the switching comparator SC11 is configured so that the switching comparator SC11 has the reference voltage value “V14” as the determination value of the determination comparator BC1, and the reference voltage value “V15” as the determination value of the determination comparator BC2. Respectively.

  Then, the determination comparator BC1 compares the voltage value “Vs” of the input signal applied to the inverting input terminal with the reference voltage value “V14” applied to the non-inverting input terminal. Further, the determination comparator BC2 compares the voltage value “Vs” of the input signal applied to the inverting input terminal with the reference voltage value “V15” applied to the non-inverting input terminal.

  Here, when the voltage value “Vs” of the input signal applied to the input terminal In1 is larger than the reference voltage value “V14”, the voltage value “Vs” applied to the inverting input terminal of the comparator BC1 for determination. Is larger than the reference voltage value “V14” applied to the non-inverting input terminal of the determination comparator BC1, and therefore, a voltage having a magnitude corresponding to the logic Lo level is output from the determination comparator BC1. That is, the voltage at the output terminal Out11 has a voltage value corresponding to the logic Lo level. Similarly, since the voltage value “Vs” applied to the inverting input terminal of the determination comparator BC2 is larger than the reference voltage value “V15” applied to the non-inverting input terminal of the determination comparator BC2, the logic Lo A voltage having a magnitude corresponding to the level is output from the determination comparator BC2. That is, the voltage at the output terminal Out12 has a voltage value corresponding to the logic Lo level. Accordingly, in the determination microcomputer 10, the voltage values at the output terminals Out11 and Out12 are both voltage values corresponding to the logic Lo level, and the voltage value at the output terminal Out13 is equal to the logic Hi level. It is determined that the voltage value of the input signal applied to the window comparator device 1 (more precisely, the input terminal In1) falls within the reference voltage values “V13” and “V14”. can do.

  On the other hand, when the voltage value “Vs” of the input signal applied to the input terminal In1 is smaller than the reference voltage value “V14” and larger than the reference voltage value “V15”, the determination comparator BC1 is not turned on. Since the reference voltage value “V14” applied to the inverting input terminal is larger than the voltage value “Vs” applied to the inverting input terminal of the determination comparator BC1, the voltage having a magnitude corresponding to the logic Hi level is determined. Output from the comparator BC1. That is, the voltage at the output terminal Out11 has a voltage value corresponding to the logic Hi level. However, since the voltage value “Vs” applied to the inverting input terminal of the judgment comparator BC2 is larger than the reference voltage value “V15” applied to the non-inverting input terminal of the judgment comparator BC2, the voltage level becomes the logic Lo level. A voltage having a corresponding magnitude is output from the comparator for judgment BC1. That is, the voltage at the output terminal Out12 has a voltage value corresponding to the logic Lo level. Therefore, in the determination microcomputer 10, the voltage value at the output terminals Out11 and Out13 is a voltage value corresponding to the logic Hi level, and the voltage value at the output terminal Out12 is equal to the logic Lo level. When it is a voltage value, it is determined that the voltage value of the input signal applied to the window comparator device 1 (more precisely, the input terminal In1) falls between the reference voltage values “V14” and “V15”. be able to.

  On the other hand, when the voltage value “Vs” of the input signal applied to the input terminal In1 is smaller than the reference voltage value “V15”, the reference voltage value “V14” applied to the non-inverting input terminal of the judgment comparator BC1. ”Is larger than the voltage value“ Vs ”applied to the inverting input terminal of the determination comparator BC1, a voltage having a magnitude corresponding to the logic Hi level is output from the determination comparator BC1. That is, the voltage at the output terminal Out11 has a voltage value corresponding to the logic Hi level. Similarly, since the reference voltage value “V15” applied to the non-inverting input terminal of the determination comparator BC2 is larger than the voltage value “Vs” applied to the inverting input terminal of the determination comparator BC2, the logic high level is set. Is output from the comparator for judgment BC2. That is, the voltage at the output terminal Out12 has a voltage value corresponding to the logic Hi level. Therefore, in the determination microcomputer 10, the voltage values at the output terminals Out11 and Out12 are both voltage values corresponding to the logic Hi level, and the voltage value at the output terminal Out13 is equal to the logic Hi level. It can be determined that the voltage value of the input signal applied to the window comparator device 1 (more precisely, the input terminal In1) is smaller than the reference voltage value “V15”.

  As described above, the determination microcomputer 10 determines the magnitude of the voltage value Vs of the input signal input through the input terminal In1 based on the digital information of each terminal fetched from the output terminals Out11 to Out13. .

  According to the window comparator device 1 described above, in the conventional technique described in the background art section, “four” comparators are required. However, the determination comparators BC1 and BC2 and the switching comparator SC11 are “total”. Since it can be configured with “three”, the number of required comparators can be reduced by “one”. Accordingly, the number of correction circuits (not shown) for correcting the hysteresis of the comparator can be reduced, so that the size of the window comparator device 1 can be reduced. Become.

  Note that the window comparator device according to the present invention is not limited to the configuration exemplified in the first embodiment, and can be implemented as, for example, the following form in which the present embodiment is appropriately changed.

  In the first embodiment, since the electrical resistance values of the resistors R11 to R16 are set to the same magnitude, the widths “V11 to V12”, “V12 to V13”, “V13 to” between the reference voltage values are set. “V14” and “V14 to V15” were the same. However, the electrical resistance values of the resistors R11 to R16 need not be set to the same electrical resistance value, and the electrical resistance values of the resistors R11 to R16 may be changed as necessary. That is, the width between the reference voltage values is arbitrary.

  In the first embodiment, the reference voltage value generation unit is configured using the constant voltage source Vcc and the resistors R11 to R16. However, the constituent elements are not limited thereto. In addition, for example, a constant voltage source set to the reference voltage value “V11 to V15” may be prepared separately to configure the window comparator device. In short, if the determination comparators BC1 and BC2 and the switching comparator SC11 can generate a reference voltage value to be compared with the voltage value of the input signal input via the input terminal In1, the configuration thereof will be described. Is optional.

(Second Embodiment)
Next, a window comparator device according to a second embodiment of the present invention will be described with reference to FIG. FIG. 2 is an equivalent circuit diagram of the window comparator device of the present embodiment.

  As shown in FIG. 2, the window comparator device 2 of the present embodiment also has a configuration according to the first embodiment. However, the window comparator device 2 of the present embodiment includes a total of four comparators: a first determination comparator BC1 and a second determination comparator BC2, and two switching comparators SC21 and SC22. Thus, the magnitude of the voltage value Vs of the input signal applied through the input terminal 2 is determined through comparison with the eight reference voltage values.

  As shown in FIG. 2, the window comparator device 2 according to the present embodiment also has a constant voltage source Vcc that generates a constant voltage of, for example, “5V”, and “55 kΩ” that is sequentially connected in series to the constant voltage source Vcc. And a plurality of resistors R21 to R29 having the following electrical resistance values. Here, since the resistors R21 to R29 have the same electric resistance value and are connected in series to the constant voltage source Vcc, the reference voltage values “V21” to “V28” at the terminals T21 to T28 between these resistors. The constant voltage of the constant voltage source Vcc is equally divided. That is, these reference voltage values have a relationship of “V21> V22>...> V27> V28”.

  The terminal T21 between the resistors R21 and R22 is connected to the non-inverting input terminal of the determination comparator BC1 via the analog switch AS21, and between the resistor R22 and the resistor R23. The terminal T22 is connected to the non-inverting input terminal of the determination comparator BC2 via the analog switch AS22. Here, for example, when the analog switches AS21 and AS22 are in a closed state, the reference voltage value “V21” at the terminal T21 is applied to the non-inverting input terminal of the comparator BC1 and the reference voltage value at the terminal T22. “V22” is applied to the non-inverting input terminal of the determination comparator BC2. In this way, the reference voltage value “V21” is used as the (first set of first) determination values of the determination comparator BC1, and the reference voltage value is used as the (first set of second) determination values of the determination comparator BC2. “V22” is set for each.

  Similarly, a terminal T24 between the resistor R24 and the resistor R25 is connected to the non-inverting input terminal of the comparator for judgment BC1 through the analog switch AS23, and the resistor R25, the resistor R26, The terminal T25 is connected to the non-inverting input terminal of the determination comparator BC2 via the analog switch AS24. Here, for example, when the analog switches AS23 and AS24 are in the closed state, the reference voltage value “V24” at the terminal T24 is applied to the non-inverting input terminal of the determination comparator BC1, and the reference voltage value “at the terminal T25” V25 "is applied to the non-inverting input terminal of the comparator for judgment BC2. In this way, the reference voltage value “V24” is used as the (second set of first) determination values of the determination comparator BC1, and the reference voltage value is used as the (second set of second) determination values of the determination comparator BC2. “V25” is set for each.

  Similarly, a terminal T27 between the resistor R27 and the resistor R28 is connected to a non-inverting input terminal of the determination comparator BC1 via the analog switch AS25, and the resistor R28 and the resistor R29. The terminal T28 between and is connected to the non-inverting input terminal of the judgment comparator BC2 via the analog switch AS26. Here, for example, when the analog switches AS25 and AS26 are closed, the reference voltage value “V27” at the terminal T27 is applied to the non-inverting input terminal of the determination comparator BC1, and the reference voltage value “T27” at the terminal T28. V28 "is applied to the non-inverting input terminal of the judgment comparator BC2. In this way, the reference voltage value “V27” is used as the (third set of first) determination value of the determination comparator BC1, and the reference voltage value is used as the (third set of second) determination value of the determination comparator BC2. “V28” is set.

  Further, the terminal T23 between the resistors R23 and R24 is connected to the non-inverting input terminal of the switching comparator SC21, and the reference voltage value “V23” at the terminal T23 is connected to the switching comparator SC21. It is a threshold value. Similarly, the terminal T26 between the resistor R26 and the resistor R27 is connected to the non-inverting input terminal of the switching comparator SC22, and the reference voltage value “V26” at the terminal T26 is the switching comparator SC22. It is a threshold value.

  In this way, the constant voltage source Vcc and the resistors R21 to R29 constitute a reference voltage value generation unit that generates a plurality of different reference voltage values “V21 to V28”, respectively.

  On the other hand, as shown in FIG. 2, the input terminal In2 for applying the input signal to the window comparator device 2 is an inversion of the comparators BC1 and BC2 for determination and the comparators SC21 and SC22 for switching. Connected to the input terminal. Among these, the output ends of the switching comparators SC21 and SC22 are connected to the switching microcomputer 20a. The switching microcomputer 20a is connected to the analog switches AS21 and AS22, AS23 and AS24, and AS25 and AS26, respectively. In this way, the switching microcomputer 20a and the analog switches AS21 to AS26 constitute a switch circuit that switches the determination values of the determination comparators BC1 and BC2 based on the comparison results of the switching comparators SC21 and SC22. Yes.

  Further, the window comparator device 2 includes a determination microcomputer (determination means) 10a. As shown in FIG. 2, the determination microcomputer 10a is connected to determination comparators BC1 and BC2 and switching comparators SC21 and SC22 via output terminals Out21 to 24, respectively. Then, the determination microcomputer 10a uses the determination comparators BC1 and BC2 and the switching comparator as digital information (comparison results) including a voltage value corresponding to the logic Hi level and a voltage value corresponding to the logic Lo level. Based on the acquired digital information, the magnitude of the voltage value Vs of the input signal input via the input terminal In2 is determined based on the acquired digital information.

  When an input signal is applied to the input terminal In2 of the window comparator device 2 configured as described above, for example, with a voltage value “Vs” larger than the reference voltage value “V23”, first, a switching comparator. SC21 and SC22 and the switching microcomputer 20a collectively switch the reference voltage value “V21” as the determination value of the determination comparator BC1 and the reference voltage value “V22” as the determination value of the determination comparator BC2. .

  Specifically, the switching comparator SC21 compares the voltage value “Vs” of the input signal applied to the inverting input terminal with the reference voltage value “V23” applied to the non-inverting input terminal. Here, since the voltage value “Vs” of the input signal applied to the inverting input terminal is larger than the reference voltage value “V23” applied to the non-inverting input terminal, the voltage corresponding to the logic Lo level is changed. Output from SC21. That is, the voltage value at the output terminal Out22 becomes a voltage value corresponding to the logic Lo level, and the voltage value corresponding to the logic Lo level is input to the switching microcomputer 20a. Similarly, in the switching comparator SC22, the voltage value “Vs” of the input signal applied to the inverting input terminal is compared with the reference voltage value “V26” applied to the non-inverting input terminal. Here, since the voltage value “Vs” of the input signal applied to the inverting input terminal is larger than the reference voltage value “V26” applied to the non-inverting input terminal, the voltage corresponding to the logic Lo level is changed. Output from SC22. That is, the voltage value at the output terminal Out24 becomes a voltage value corresponding to the logic Lo level, and the voltage value corresponding to the logic Lo level is input to the switching microcomputer 20a.

  When the voltage corresponding to the logic Lo level is output from the switching comparators SC21 and SC22 in this way, the switching microcomputer 20a applies a voltage corresponding to the logic Lo level to the analog switches AS21 and AS22. A voltage corresponding to the logic Hi level is applied to the switches AS23 and AS24 and AS25 and AS26. The analog switches AS23 and AS24 and AS25 and AS26 are opened, while the analog switches AS21 and AS22 are closed, and the reference voltage value “V21” is applied to the non-inverting input terminal of the determination comparator BC1. The reference voltage value “V22” is applied to the non-inverting input terminal of the comparator for judgment BC2. As described above, the switching comparators SC21 and SC22 and the switching microcomputer 20a have the reference voltage value “V21” as the determination value of the determination comparator BC1 and the reference voltage value “V22” as the determination value of the determination comparator BC2. To “”.

  Then, the determination comparator BC1 compares the voltage value “Vs” of the input signal applied to the inverting input terminal with the upper reference voltage value “V21” applied to the non-inverting input terminal. Further, the determination comparator BC2 compares the voltage value “Vs” of the input signal applied to the inverting input terminal with the reference voltage value “V22” applied to the non-inverting input terminal.

  Here, when the voltage value “Vs” of the input signal applied to the input terminal In2 is larger than the reference voltage value “V21”, the voltage value “Vs” applied to the inverting input terminal of the comparator BC1 for determination. Is larger than the reference voltage value “V21” applied to the non-inverting input terminal of the determination comparator BC1, and therefore, a voltage having a magnitude corresponding to the logic Lo level is output from the determination comparator BC1. That is, the voltage at the output terminal Out21 has a voltage value corresponding to the logic Lo level. Similarly, since the voltage value “Vs” applied to the inverting input terminal of the determination comparator BC2 is larger than the reference voltage value “V22” applied to the non-inverting input terminal of the determination comparator BC2, the logic Lo A voltage having a magnitude corresponding to the level is output from the determination comparator BC2. That is, the voltage at the output terminal Out23 has a voltage value corresponding to the logic Lo level. Therefore, in the determination microcomputer 10a, when all the voltage values taken in from the output terminals Out21 to Out24 are voltage values corresponding to the logic Lo level, the window comparator device 2 (more precisely, the input terminal In2) is connected. On the other hand, it can be determined that the voltage value of the input signal applied is larger than the reference voltage value “V21”.

  On the other hand, when the voltage value “Vs” of the input signal applied to the input terminal In2 is smaller than the reference voltage value “V21” and larger than the reference voltage value “V22”, the determination comparator BC1 is not turned on. Since the reference voltage value “V21” applied to the inverting input terminal is larger than the voltage value “Vs” applied to the inverting input terminal of the determination comparator BC1, a voltage having a magnitude corresponding to the logic Hi level is determined. Output from the comparator BC1. That is, the voltage at the output terminal Out21 has a voltage value corresponding to the logic Hi level. However, since the voltage value “Vs” applied to the inverting input terminal of the determination comparator BC2 is larger than the reference voltage value “V22” applied to the non-inverting input terminal of the determination comparator BC2, the voltage level becomes “V”. A voltage having a corresponding magnitude is output from the comparator for judgment BC1. That is, the voltage at the output terminal Out23 has a voltage value corresponding to the logic Lo level. Therefore, in the determination microcomputer 10a, the voltage value acquired from the output terminal Out21 is a voltage value corresponding to the logic Hi level, and the voltage value acquired from the output terminals Out22 to Out24 corresponds to the logic Lo level. The voltage value of the input signal applied to the window comparator device 2 (more precisely, the input terminal In2) falls within the reference voltage values “V21” and “V22”. It can be determined.

  On the other hand, when the voltage value “Vs” of the input signal applied to the input terminal In2 is smaller than the reference voltage value “V22”, the reference voltage value “V21” applied to the non-inverting input terminal of the determination comparator BC1. ”Is larger than the voltage value“ Vs ”applied to the inverting input terminal of the determination comparator BC1, a voltage having a magnitude corresponding to the logic Hi level is output from the determination comparator BC1. That is, the voltage at the output terminal Out21 has a voltage value corresponding to the logic Hi level. Similarly, since the reference voltage value “V22” applied to the non-inverting input terminal of the judgment comparator BC2 is larger than the voltage value “Vs” applied to the inverting input terminal of the judgment comparator BC2, the logic Hi level Is output from the comparator for judgment BC2. That is, the voltage at the output terminal Out23 has a voltage value corresponding to the logic Hi level. Therefore, in the determination microcomputer 10a, the voltage values taken from the output terminals Out21 and Out23 are both voltage values corresponding to the logic Hi level, and the voltage values at the output terminals Out22 and Out24 are at the logic Lo level. When the voltage value has a corresponding magnitude, the voltage value of the input signal applied to the window comparator device 2 (more precisely, the input terminal In2) is between the reference voltage values “V22” and “V23”. It can be determined that it fits.

  Similarly, an input signal is applied to the input terminal In2 of the window comparator device 2 with a voltage value “Vs” that is smaller than the reference voltage value “V23” and larger than the reference voltage value “V26”, for example. Then, first, the switching comparators SC21 and SC22 and the switching microcomputer 20a set the reference voltage value “V24” as the determination value of the determination comparator BC1 and the reference voltage value as the determination value of the determination comparator BC2. It is switched to “V25” at once. At this time, the voltage value at the output terminal Out22 is a voltage value corresponding to the logic Hi level, and the voltage value at the output terminal Out24 is a voltage value corresponding to the logic Lo level.

  Furthermore, when the voltage value “Vs” of the input signal applied to the input terminal In2 is larger than the reference voltage value “V24”, the voltages at the output terminals Out21 and Out23 have a voltage value corresponding to the logic Lo level. It has become. On the other hand, when the voltage value “Vs” of the input signal applied to the input terminal In2 is smaller than the reference voltage value “V24” and larger than the reference voltage value “V25”, the voltage at the output terminal Out21 is logical. The voltage value corresponds to the Hi level, and the voltage at the output terminal Out23 has a voltage value corresponding to the logic Lo level. On the other hand, when the voltage value “Vs” of the input signal applied to the input terminal In2 is smaller than the reference voltage value “V25”, the voltages at the output terminals Out21 and Out23 have a voltage value corresponding to the logic Hi level. It has become.

  Similarly, when an input signal is applied to the input terminal In2 of the window comparator device 2 with, for example, a voltage value “Vs” smaller than the reference voltage value “V26”, first, the switching comparators SC21 and SC22. In addition, the switching microcomputer 20a collectively switches the reference voltage value “V27” as the determination value of the determination comparator BC1 and the reference voltage value “V28” as the determination value of the determination comparator BC2. At this time, the voltage values at the output terminals Out22 and Out24 are voltage values corresponding to the logic Hi level.

  Furthermore, when the voltage value “Vs” of the input signal applied to the input terminal In2 is larger than the reference voltage value “V27”, the voltages at the output terminals Out21 and Out23 have a voltage value corresponding to the logic Lo level. It has become. On the other hand, when the voltage value “Vs” of the input signal applied to the input terminal In2 is smaller than the reference voltage value “V27” and larger than the reference voltage value “V28”, the voltage at the output terminal Out21 is logical. The voltage value corresponds to the Hi level, and the voltage at the output terminal Out23 has a voltage value corresponding to the logic Lo level. On the other hand, when the voltage value “Vs” of the input signal applied to the input terminal In2 is smaller than the reference voltage value “V28”, the voltages at the output terminals Out21 and Out23 have a voltage value corresponding to the logic Hi level. It has become.

  Thus, the determination microcomputer 10a determines the magnitude of the voltage value Vs of the input signal input through the input terminal In2 based on the digital information of each terminal fetched from the output terminals Out21 to 24. it can.

  According to the window comparator device 2 described above, in the conventional technique described in the background art section, “6” comparators are necessary. However, the comparators BC1 and BC2 for determination and the comparators SC21 and SC22 for switching are included. Since the total number of comparators can be “4”, the number of required comparators can be reduced by “2”. Accordingly, the number of correction circuits (not shown) for correcting the hysteresis of the comparator can be reduced, so that the size of the window comparator device 2 can be reduced. Become.

  Note that the window comparator device according to the present invention is not limited to the configuration exemplified in the second embodiment, and can be implemented as, for example, the following form in which the present embodiment is appropriately changed.

  In the second embodiment, the determination microcomputer 10a and the switching microcomputer 20a are provided. However, the present invention is not limited to this, and a single microcomputer may be used.

  In the second embodiment, since the electrical resistance values of the resistors R21 to R29 are set to the same magnitude, the widths “V21 to V22”, “V22 to V23” between the reference voltage values,... , “V26 to V27” and “V27 to V28” were the same. However, the electrical resistance values of the resistors R21 to R29 may not be set to the same electrical resistance value, and the electrical resistance values of the resistors R21 to R29 may be changed as necessary. That is, the width between the reference voltage values is arbitrary.

  In the second embodiment, the reference voltage value generation unit is configured using the constant voltage source Vcc and the resistors R21 to R29. However, the constituent elements are not limited thereto. In addition, for example, a constant voltage source set to the reference voltage value “V21 to V28” may be prepared separately to configure the window comparator device. In short, if the determination comparators BC1 and BC2 and the switching comparators SC21 and SC22 can generate a reference voltage value to be compared with the voltage value of the input signal input via the input terminal In2, The configuration is arbitrary.

(Other embodiments)
Moreover, each said embodiment can also be implemented as the following forms, for example.

  In the first embodiment, the window comparator device 1 includes a total of three comparators, ie, comparators BC1 and BC2 for determination and a comparator SC11 for switching, and an input terminal through comparison with five reference voltage values. The magnitude of the voltage value Vs of the input signal input via In1 has been determined. In the second embodiment, the window comparator device 2 includes a total of four comparators, ie, comparators BC1 and BC2 for determination and switching comparators SC21 and SC22, and compares them with eight reference voltage values. Then, the magnitude of the voltage value Vs of the input signal applied via the input terminal 2 is determined. It is not restricted to such a configuration. As shown in FIG. 3 as a diagram corresponding to FIGS. 1 and 2, the comparators BC1 and BC2 for determination and the comparators SC31 to SC33 for switching are provided in total, and 11 reference voltage values are provided. It is also possible to configure the window comparator device 3 to determine the magnitude of the voltage value Vs of the input signal input through the input terminal In3 through comparison with. According to such a configuration as the window comparator device 3, in the conventional technique described in the background art section, “8” comparators are required, but the determination comparators BC1 and BC2 and the switching comparator SC31. Since it can be configured with a total of “5” to SC33, the number of required comparators can be reduced by “3”. As a result, the number of correction circuits (not shown) for correcting the hysteresis of the comparator can be reduced, so that the size of the window comparator device 3 can be reduced. Become.

  Moreover, it is not restricted to such a structure. In short, if a window comparator device is configured using judgment comparators BC1 and BC2 and “N (pieces)” switching comparators, that is, a total of “N + 2 (pieces)” comparators, It is possible to determine how to reach the reference voltage value of “(N + 1) × 2 + N (pieces)”. According to the conventional window comparator described in the background art section, a comparator is required for each determination value. Therefore, even if an “N + 2 (piece)” comparator is used, a reference voltage of “N + 2 (piece)” is used. When only the arrival mode of the value can be determined, according to such a configuration as the window comparator device, the number of comparators can be reduced in determining the arrival mode of the same number of reference voltage values. Will be able to. As a result, the number of correction circuits and the like for correcting the hysteresis of the comparator can be reduced, so that the size of the window comparator device can be reduced. In addition, as the number of reference voltage values increases, in other words, as the determination accuracy increases, the effect of reducing the number of comparators, and thus the effect of reducing the size of the comparator, increases.

  In the above embodiments (including modifications), the reference voltage value set as the threshold value of the switching comparators (SC11 to SC33) is used as the reference value set as the determination value of the determination comparators (BC1 and BC2). Although the reference voltage value is different from the voltage value, the present invention is not limited to this. Even if the reference voltage value set as the threshold value and the determination value is partially overlapped, the intended purpose can be achieved.

  In the above-described embodiment (including the modified example), the determination comparator is configured by two of the first determination comparator and the second determination comparator. A comparator for determination may be configured by the comparator. In short, if the judgment value of the judgment comparator is switched through the switch circuit based on the comparison result of the switching comparator, the input signal can be obtained even if the judgment comparator is constituted by a single comparator. Can be compared with a large number of determination values. That is, the window comparator device does not need to include a comparator for determination in addition to the determination value, so that the number of comparators can be reduced. Since the number of comparators can be reduced, the number of correction circuits and the like for correcting the hysteresis of the comparators can be reduced, and the size of the window comparator device can be reduced. Will be able to. Even with such a configuration, the intended purpose can be achieved.

The figure which shows an example of the equivalent circuit about 1st Embodiment of the window comparator apparatus which concerns on this invention. The figure which shows an example of the equivalent circuit about 2nd Embodiment of the window comparator apparatus which concerns on this invention. The figure which shows an example of the equivalent circuit about the modification of each embodiment. The figure which shows an example of the equivalent circuit about the conventional window comparator.

Explanation of symbols

1, 2, 3... Window comparator device, 10, 10a... Determination microcomputer (determination means), 20a, 20b... Switching microcomputer (switch circuit), In1. ~ 35 ... Output terminal, R11 to R16, R21 to R29, R301 to R312 ... Resistor, T11 to T15, T21 to T28, T301 to T311 ... Terminal, AS11 to AS14, AS21 to AS26, AS31 to AS38 ... Analog switch ( Switch circuit), IN11... Inverter, BC1... (First) determination comparator, BC2 (second) determination comparator, SC11, SC21 to 22, SC31 to 33... Switching comparator, Vcc. .

Claims (7)

A window comparator device that determines the magnitude of the voltage value of the input signal through a comparison between different reference voltage values and the voltage value of the input signal,
A reference voltage value generation unit that generates the plurality of reference voltage values;
A determination comparator for comparing a reference voltage value used as a determination value of the determination comparator among the plurality of reference voltage values with a voltage value of the input signal;
A switching comparator that compares a reference voltage value used as a threshold value of the switching comparator among the plurality of reference voltage values with a voltage value of the input signal;
The determination comparator is configured to include an analog switch interposed between the reference voltage value generation unit and the determination comparator, and through the analog switch based on a comparison result of the switching comparator. A switch circuit for switching the judgment value of
A window comparator device comprising: a determination unit that determines a magnitude of a voltage value of the input signal based on a comparison result of the determination comparator and a comparison result of the switching comparator. The judgment comparator is composed of two parts, a first judgment comparator and a second judgment comparator,
As a first determination value that is a determination value of the first determination comparator, a larger reference voltage value of two adjacent reference voltage values is set, and a determination value of the second determination comparator As the second determination value that is, the smaller reference voltage value of the two adjacent reference voltage values is set,
The switch circuit switches the first determination value and the second determination value in a batch based on a comparison result of the switching comparator,
The determination means determines a magnitude of a voltage value of the input signal based on a comparison result of the first and second determination comparators and a comparison result of the switching comparator. The window comparator device according to 1.   The window comparator device according to claim 2, wherein a reference voltage value different from the first determination value and the second determination value is set as the threshold value of the switching comparator. The switching comparator is composed of one comparator,
The reference voltage value generation unit generates five different reference voltage values,
Each of these five reference voltage values is, in order of magnitude, “first set of first determination values → first set of second determination values → threshold → second set of first determination values → second set of second set of values”. Set as `` judgment value '',
When the comparison result that the voltage value of the input signal is larger than the threshold value is obtained through the switching comparator, the switch circuit uses the first set of judgment values as the judgment value of the first judgment comparator. A comparison that the voltage value of the input signal is smaller than the threshold value and the first determination value is collectively switched to the first determination value of the second determination value as the determination value of the second determination comparator. When the result is obtained, the determination value of the first determination comparator is set to the second set of first determination values, and the determination value of the second determination comparator is set to the second set of second determination values. The window comparator device according to claim 3, wherein each is switched at once. The switching comparator is composed of two parts, a first switching comparator and a second switching comparator,
The reference voltage value generation unit generates eight different reference voltage values,
Each of these eight reference voltage values is, in order of magnitude, “first set of first decision values → first set of second decision values → first threshold value → second set of first decision values → second set of sets”. Second determination value → second threshold → third set of first determination value → third set of second determination value ”
When the comparison result indicating that the voltage value of the input signal is larger than the first threshold value is obtained through the switching comparator, the switch circuit uses the first determination comparator as the determination value. A set of first determination values is collectively switched to the first set of second determination values as the determination value of the second determination comparator, and the voltage value of the input signal is smaller than the first threshold value. And when a comparison result indicating that the value is larger than the second threshold value is obtained, the determination value of the first determination comparator is set to the first determination value of the second set of the second determination comparator. When the comparison result that the voltage value of the input signal is smaller than the second threshold value is obtained as a determination value, the first determination comparison is performed. The second set of first determination values as the second determination value The second determination value of the third set as the determination value of 較器, window comparator device according to claim 3, characterized in that switching collectively respectively. The switching comparator is composed of three first to third switching comparators,
The reference voltage value generation unit generates eleven different reference voltage values,
Each of these 11 reference voltage values is, in order of magnitude, “first set of first determination values → first set of second determination values → first threshold value → second set of first determination values → second set of sets”. 2nd determination value-> 2nd threshold-> 3rd set of 1st determination value-> 3rd set of 2nd determination value-> 3rd threshold-> 4th set of 1st determination value-> 4th set of 2nd determination value Set,
When the comparison result indicating that the voltage value of the input signal is larger than the first threshold value is obtained through the switching comparator, the switch circuit uses the first determination comparator as the determination value. A set of first determination values is collectively switched to the first set of second determination values as the determination value of the second determination comparator, and the voltage value of the input signal is smaller than the first threshold value. And when a comparison result indicating that the value is larger than the second threshold value is obtained, the determination value of the first determination comparator is set to the first determination value of the second set of the second determination comparator. As a determination value, the second set of second determination values are collectively switched, and a comparison result indicating that the voltage value of the input signal is smaller than the second threshold value and larger than the third threshold value is obtained. The third judgment value as the judgment value of the first judgment comparator. The first judgment value is switched to the third judgment value as the judgment value of the second judgment comparator in a lump, and the voltage value of the input signal is smaller than the fourth threshold value. When the comparison result is obtained, the fourth set of first determination values is set as the determination value of the first determination comparator, and the fourth set of second determination is set as the determination value of the second determination comparator. 4. The window comparator device according to claim 3, wherein each of the values is collectively switched.   The said reference voltage value production | generation part has a constant voltage source which outputs the voltage of a predetermined value, and several resistors directly connected to the said constant voltage source, The any one of Claims 1-6 characterized by the above-mentioned. Window comparator device according to item.

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