JPS6146850B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a temperature control device that controls the temperature of a controlled object such as a control room that is controlled by a heat source that performs cooling or heating including a compressor.
Its objectives are as follows.

(1) It is a temperature control device that creates a highly comfortable living space.

For example, when a conventional compressor is used for cooling operation, the temperature in the control room is detected by a thermistor, and the set ON temperature is X°C and the set OFF temperature is Y°C.
The compressor was controlled by a thermostat that turned on and off. This method has the following drawbacks because the gap temperature α of the thermostat is constant α=(X-Y)°C. In particular, when the load on the control room is light, the temperature in the control room increases slowly after the thermostat is turned off, so it takes an extremely long time to reach the set ON temperature of X°C. Therefore, the compressor has a long OFF period, and the temperature in the control room rises during this period, making it uncomfortable. In addition, the above-mentioned drawbacks can be solved by setting the thermostat gap temperature α°C narrowly, but conversely,
If the control room is under heavy load, the thermostat will
After turning off, the temperature in the control room rises rapidly and reaches the set ON temperature of X℃ in a short time. the result,
There is a problem in that the number of times the compressor is turned on and off increases, leading to the deterioration of its life. Generally, at the gap temperature α℃
Conventionally, the temperature was set at 1.5 to 2°C.

It is the intent of the present invention that the thermostat
After a predetermined time T ₁ after turning off, the gap temperature α℃
Change the setting of the operating point so that the temperature is approximately 0℃ or decreased to β℃, which is close to 0, so that the new set ON temperature X℃ = (Setting OFF temperature Y℃ + gap temperature O ~ β,℃) This is what we do. As a result,
The thermostat turns on when the temperature in the control room reaches the new set ON temperature X°C, so the compressor turns on earlier than with the conventional method, reducing discomfort caused by increased humidity in the control room. Also,
During heavy loads, the gap temperature is α°C, which is the same as in the conventional case, so there is no problem with compressor life. In order to achieve the above control method, the timer-up output of a counter-type timer unit, which includes a single specific number of circuits that are charged by the ON signal of the thermostat and start discharging from the generation of the OFF signal, is used for the predetermined period of time.
This is what gives T ₁ .

(2) Compressor motor locks, seizures, etc. that occur when restarting the compressor within a short period of time after it has stopped operating
Or, it is a temperature control device that reliably protects against power breaker tripping.

In particular, by using the single time constant circuit described above that starts discharging based on the generation of the thermostat OFF signal, the compressor is restarted for a period until the voltage of this time constant circuit drops to the reference low voltage V _L. The solution is to provide a timer section that prohibits

(3) The temperature control device provides user convenience by displaying the period during which restarting the compressor is prohibited after it has stopped operating.

(4) The main part of the temperature control device is made into a semiconductor integrated circuit, thereby achieving miniaturization and improved reliability while strengthening the control function. In particular, cooling
As a temperature control device that can be used for both heating, exclusive OR is used as a means to invert the thermostat output signal during cooling and heating, and cooling or heating can be selectively shared by the same temperature control device using an external signal. , is a general-purpose control device used.

An embodiment of the present invention will be described based on the drawings. The drawing shows an example in which the present invention is applied to cooling using a compressor or heating using a heat pump.

FIG. 1 is a diagram of a heat source system. 1 is a structure such as a house, 2 is a control room that is the object to be controlled, and 3 is an outdoor unit that is composed of a compressor 4, a four-way valve 5, an outdoor heat exchanger 6, a fan motor 7, and a capillary tube 8. Ru. Reference numeral 9 denotes an indoor unit, which is composed of an indoor heat-light exchanger 10, a fan motor 11, and a capillary tube 12, in which a refrigerant is circulated through pipes 13 and 14. During cooling, the four-way valve 5 operates so that the outdoor heat exchanger 6 functions as a condenser and the indoor heat exchanger 10 functions as an evaporator. Furthermore, during heating, the four-way valve 5 is configured to operate so that the refrigerant circulates in the opposite direction. Note that 15 is blown air, 16 is suction air, and 17 is outdoor blown air. Figure 2 shows
It is an electrical wiring diagram. 18 is an AC power supply, 19 is a power switch, 20 is a temperature control device, and power terminal 2
1, 22, a relay that includes a thermistor 23 that detects the temperature of the control room 2 by detecting the temperature of the blown air or suction air of the indoor unit 9 in FIG. 1, a temperature setting volume 24, and a drive contact 25a of the compressor 4. 25. Display unit 26, 2 that displays the control status
7. A terminal 31 that receives input from a switching means 30 that is turned on when heating is selected, including the cooling/heating changeover switches 28 and 29. 32 is a speed changeover switch for the fan motor 11 of the indoor unit. FIG. 3 is a block diagram showing the main part of the present invention, and FIG. 4 is a timing chart for explaining the operation. The constituent elements of the present invention in FIG. 3 include a bridge 33 including a thermistor 23;
A comparator 34 that turns ON and OFF, at least one differential circuit 35 that receives the output of the comparator 34 and determines the gap voltage of the bridge 33, is charged by the ON output of the comparator 34, and generates an OFF output. Single time constant circuit 3 that starts discharge as a base point
6. Includes a counter-type timer section 37 that detects the discharge pressure of the time constant circuit 36 and performs frequency division operation to generate a plurality of frequency-divided outputs. A control logic 38 that operates the machine 4 in a set order, a load output circuit 39 that operates the relay 25, and a power reset circuit 4.
0. Other inputs and outputs include a cooling/heating changeover switch 29 and a display section 27. Further, 41 is a main circuit for temperature control. The operation sequence during cooling operation will be explained with reference to FIG. In this case, the cooling/heating selector switch 29 is OFF, and in FIG.
This is an example in which the temperature setting volume 24 is set so that the set OFF temperature Y.℃ = 25℃, the comparator 34 is turned off and the relay 25 is turned off by the load output circuit 39, and its contact 25a Stop compressor 4. Also, set ON temperature X℃ = 27℃
When the room temperature rises, comparator 34 turns on and relay 2
5 is turned on and compressor 4 is activated. This state is mode A in FIG. In FIG. 4, when the room temperature drops to the set OFF temperature Y°C at time _t1 , the resistance of the thermistor 23 increases, so the voltage at the positive input terminal of the comparator 34 decreases, and the output of the comparator 34 becomes an "O" voltage. That is, it turns off and the compressor 4 stops. This also turns off the differential circuit 35, disconnecting the gap resistor 44 of the bridge 33 and returning it to the series circuit of the reference resistors 42 and 43. As a result, the negative terminal of the comparator 34, that is, the reference voltage, is set higher than the reference voltage V _S of the bridge 33 when the compressor 4 is turned on by ΔV. In terms of temperature, at time t ₁ , the set point of bridge 33 is Y
This means that the temperature suddenly changed from °C to X °C. time t ₁
Previously, since the room temperature was higher than the set OFF temperature Y° C., the output of the comparator 34 was “1” voltage, that is, it was ON. With this ON output, the single time constant circuit 36 is charged to approximately the power supply voltage and is on standby. Then, at time t ₁ , the room temperature is set to OFF.
Since the temperature drops to Y°C, the comparator 34 turns OFF,
The capacitor 46 of the time constant circuit 36 is a resistor 47
When this voltage drops to the set reference low voltage V _L , the control logic 38 detects,
Gives output at time t ₂ . This period _T2 is a period in which restarting the compressor 4 is prohibited, and the comparator 34 outputs a
Even if there is an ON signal, or the power switch 1
The control logic 38 is configured to prohibit restart even if the power switch 9 is turned off and then turned on again. Further, the display section 27 lights up only during this _T2 period.

Next, mode B in FIG. 4 will be explained. This mode is used when the load on the control room 2 is light. At time _t7 , when the room temperature drops to the set OFF temperature Y°C, the comparator 34 turns OFF and the gap resistor 44 of the bridge 33 is disconnected. As a result, the ON point of the comparator 34 becomes the set ON temperature X° C., and the capacitor 46 of the time constant circuit 36 starts discharging. This voltage is determined by the control logic 38 as a reference low voltage V _L
At time _t8 , the timer section 37 of the control logic 38 outputs an output to release the restart inhibited state of the compressor 4. This period T ₂ is the same as mode A. After time _t8 , the time constant circuit 36 charges and discharges between the reference high voltage _VH and the reference low voltage _VL ,
Control logic 38 is configured to generate a clock signal, which is frequency-divided by timer section 16 including a counter to produce a final frequency-divided (time-up) output at time _t9 . The differential circuit 35 is operated with this final frequency-divided output, and the gap resistor 44 of the bridge 33 is turned on. As a result,
Resistors 43 and 44 are connected in parallel,
The set point of bridge 33 is set at time t ₉
The ON temperature decreases from X°C to the new set ON temperature X°C (temperature higher than the set OFF temperature Y°C by the gap temperature β°C).
The predetermined time T ₁ from time t ₇ to t ₉ will hereinafter be referred to as forced return time. The gap temperature β°C is determined by the differential circuit 35 being configured such that when the differential circuit 35 is operated by the final frequency-divided output of the control logic 38, a dummy resistor _Rx is inserted in series with the gap resistor 44. and when operated by the comparator 34, the dummy resistor _R.sub.X is configured to be zero. When the room temperature reaches the new set ON temperature U°C at time _t10 in Fig. 4, the comparator 34 turns ON.
This output operates the differential circuit 35, which connects the gap resistor 44 in parallel with the resistor 43 (in this case,
A dummy resistor R _x =O) is connected to the bridge 33
The set point is the set OFF temperature Y°C. At the same time, the comparator 34 is turned on, and the compressor 4 is activated. Then, when the room temperature decreases and reaches the set OFF temperature Y°C, the comparator 34 turns OFF and the compressor 4 stops, at the same time,
The set point of Bridge 33 also rises to the set ON temperature X°C. Also, when the comparator is turned off, the time constant circuit 36
starts discharging and prohibits the restart of the compressor 4 until time _t2 , and at time _t13 , the set point of the bridge 33 is lowered to X°C, that is, the operation of forced return is repeated. As can be seen from Figure 4, in the case of mode B, the load on the control room 2 is light, and the swing width of the room temperature is from α℃=(X-Y)℃ to B
℃, and the humidity swing of the control room 2 can also be made relatively narrow. Furthermore, the third
The transistor 48 in the figure is the load output circuit 39
The diode 50 is a spike voltage killer for the relay 25. Also, 49 and 51 are resistors, and 2
6 is a light emitting diode that lights up when the compressor 4 is in operation. Reference numeral 27 denotes a light emitting diode, which is a display section that lights up at time _T2 when restarting the compressor 4 shown in FIG. 4 is prohibited. Further, a capacitor 45 for noise prevention is also connected in parallel with the thermistor 23. Next, details of the operation will be explained using the detailed circuit shown in FIG. In FIG. 5, the same parts as in FIG. 3 are given the same numbers. 53 is a power supply section, which includes a surge absorber 54, a transformer 55, and a diode 5.
6, a smoothing capacitor 57, a resistor 58, a constant voltage diode 59, and a capacitor 60. The main part 41 for temperature control is a semiconductor integrated circuit and has terminal pins. The pin is Bridge〓
The input terminal and pin of the thermistor are the reference voltage terminals, and the reference voltage V _S is set to △V by the gap resistor 44.
only changes. The pin is a differential terminal, the pin is a selection terminal for cooling or heating, the pin is a ground terminal, the pin is a charging/discharging terminal for the single time constant circuit 36, the pin prohibits the restart of the compressor 4
The pin is a terminal that lights up the display section 27 only during the _T2 period, the pin is a terminal that drives the relay 25 that drives the compressor 4, and the pin is a control power supply terminal. Control logic 38 is then constructed as follows. A cooling/heating inverter 61 consisting of an exclusive OR, a voltage check circuit 62 of the time constant circuit 36, and a voltage comparator 63 of the time constant circuit 36 as a timer section 37.
A two-level voltage comparator 65 consisting of a voltage converter 64 that generates a reference low voltage V _L and a reference voltage V _H from this output, a clock gate 66 that controls the clock generated by the voltage comparator 63, a counter 67, and a time constant circuit. Charging control circuit 6 that controls charging and discharging to 36
8. The control logic 38 is comprised of parts including a charging amplifier 69, an operation display circuit 70 for creating a _T2 period for prohibiting the restart of the compressor 4, an amplifier 71 thereof, a reset circuit 72 for the counter 67, and the like.

Next, the operation will be explained. First, mode B in FIG. 4 will be described. Immediately before time t ₇ in Figure 4,
Compressor 4 because the room temperature is higher than the set OFF temperature Y℃
is ON. In this case, since the output 73 of the comparator 34 is "1", that is, it is ON, the pin becomes zero voltage due to the differential circuit 35, and the gap resistor 44 is connected in parallel with the resistor 43. Therefore, the pin is at the reference voltage V _S . Further, the output 74 of the inverter 61 is also "1", and the outputs 75 and 76 of the voltage check circuit 62 are both "1", so the transistor 48 is turned on by the load output circuit 39, and the relay 2 is turned on.
5, the compressor 4 is operating. Then, the output 76 of the voltage check circuit 62 causes the charging amplifier 6 to
9. The time constant circuit 36 is charged from the pin via the diode 77 to almost the power supply voltage (V _CC ), and the counter 67 is also reset by the reset circuit 72 . This state is t ₇ or more in FIG. 6.

When the room temperature reaches the set OFF temperature Y℃ at time _t7 ,
As shown in FIG. 6, the output 73 of the comparator 34 becomes O voltage and turns off, and the compressor 4 stops. At the same time, since the output 76 of the electric check circuit 62 is "0", the charging amplifier 69 is turned off, and the voltage V _C of the time constant circuit 36 is turned off.
begins to drop from the power supply V _CC . The output 78 of voltage comparator 63 is "1" and the output 79 of clock gate 66 is held at "O". Further, the voltage converter 64 is set to a reference low voltage _VL .
The first frequency division output 80 of the counter 67 is at "1" and the final frequency division (time-up) output is at "O". At this point, the display unit 27 is turned on by the operation display unit 70, but the logic is that although the output of the inverter 74 is “0”, the output 83 of the inverter 82 is “1”, and the output 78 of the voltage comparator 63 is "1" of
and the first frequency division of the counter (same as the reset output)
Operation display unit 7 which is NAND with “1” of output 80
The output 84 of 0 becomes "0", and the amplifier 71 draws current to the display section 27 to turn it on. Further, the voltage check circuit 62 outputs the first frequency divided output 80 of the counter 67 by dropping its output 76 to "0".
Temporarily, the output of the inverter 74 is "1" until this occurs.
The output 75 is locked so that it does not become "1" even if it returns to "1". The charging control circuit 68 is composed of a NOR gate, and the output 78 of the voltage comparator 63 which is its input is "1", the first frequency division output 80 is "1", and the final frequency division (time up) output is "0". Since the output 85 is "0", the time constant circuit 36 is not charged and continues discharging. And time t ₈
When the voltage V _C of the time constant circuit 36 reaches the reference low voltage V _L , the output 78 of the voltage comparator 63 changes from "1" to "0" and is returned to the reference high voltage V _H by the voltage converter 64. . At the same time, since the inverter 74, which is the input of the clock gate 66, is at "0", the output 78 falls to "0", and at the same time, the output 79
changes from "0" to "1", and the counter 67 is frequency-divided at this edge, so that the first frequency-divided output 80 changes from "1" to "0".

As a result, the operation display section 70 stops operating, the display section 27 turns off, the voltage check circuit 62 is released from the locked state, and is always on standby so that the output 74 of the inverter 61 can be received. In addition, the charging controller 68
Since the final frequency division output 81 is still "0",
After time _t8 when the first frequency divided output 80 falls to "0", it is controlled by the output 78 of the voltage comparator 63, and becomes "1" only when this output 78 becomes "0".
The output is output, the charging amplifier 69 is turned on, and the time constant circuit 36 is charged. Then, when the voltage V _C of the time constant circuit 36 is charged to the reference voltage V _H , the output 78 of the voltage comparator 63 changes from "0" to "1", so that charging is stopped. As a result, it acts as a self-excited oscillator that charges and discharges between voltages V _H and V _L . This oscillation pulse passes through clock gate 66 and divides the frequency of counter 67. Then, at time _t9 , when the final frequency division (time up) output 81 changes from "0" to "1", the charging controller 68 stops and charging to the time constant circuit 36 is stopped, so this voltage V _C It discharges towards 0 voltage. In addition, when the final frequency division (time up) output 81 becomes "1", the input to the differential circuit 35 is added, and the input is connected in series with the dummy resistor _Rx built in the differential circuit 35. Since the gap resistor 44 is connected in parallel with the resistor 43, the reference voltage at the pin decreases. The set point of the bridge 33 obtained by this operation of changing the explanation is the fourth
As shown in the figure, the new setting is turned ON from the setting ON temperature
The temperature changes to X℃. If the dummy resistor R _X is set to zero, the gap temperature β° C.=0° C., and if the R _X is increased, β° C. can be increased. That is, the gap temperature (also called differential) β° C. is made small or zero. then time
At t ₁₀ , the room temperature reaches the new set ON temperature X°C, the output 73 of the comparator 34 becomes "1", that is, ON, and the above operation is repeated again due to the output "1" of the inverter 61. . At this time, the output 73 of the comparator 34 causes the differential circuit 35 to set the built-in dummy resistance R _x =0, so the set point of the bridge 33 is set to the set OFF temperature Y°C, as described above. . In case of Fig. 4 A, mode B
As explained in , after the comparator 34 turns OFF,
The voltage check circuit 62, which generates the first frequency-divided output 80 of the counter 67, always outputs the output of the inverter 61,
That is, since the output of the comparator 34 is on standby, the compressor 4 can be driven by the load output circuit 39 when the comparator 34 is inverted and outputs "1".

Next, when the power switch 19 is turned on, if there is a residual voltage of 36 timed times (not much time has passed since the compressor 4 stopped operating), or if there is no residual voltage (the compressor 4 stops operating). The restart control by the voltage check circuit 62 when a sufficient amount of time has elapsed since then will be explained. FIG. 7 shows a detailed circuit diagram of the voltage check circuit 62, and the same parts as in FIG. 5 are given the same numbers.

First, the room temperature in the control room 2 is high, and the time constant circuit 3
The case where there is no residual voltage of No. 6 will be explained. This state occurs immediately after the power switch 19 is turned on.
This is an example of a vehicle being driven by a driver. When the power switch 19 is turned on, the power reset circuit 40 emits a pulse for a predetermined period of time. The circuit that is initially reset in response to this pulse is indicated by the arrow RST in FIGS. 5 and 7. During the generation period of this reset pulse, the output of the inverter 89 in FIG. 7 is "0".
The output of NAND gate 91 is "1", inverter 9
The output 76 of 2 becomes "0", and the previous state is maintained during this pulse period. Now, time constant circuit 36
Since the residual voltage V _C of is 0 voltage, the voltage comparator 6
The output 78 of 3 is '0', therefore the NAND gate 9
The output of 3 is "1". With this "1" output
The output of the NOR gate 94 is “0” and the inverter 95
The output of is "1", the comparator 34 is turned on and the output 74 of the inverter 61 is "1", so that NAND
The gate 96 becomes "0" and the inverter 97 becomes "1". Therefore, when the output of the voltage check circuit 62 becomes "1", the compressor 4 is operated. After that, when the pulse of the power supply reset circuit 40 disappears, the output of the inverter 89 changes from "0" to "1", the inverter 90 becomes "1" due to the NAND gate 96, the output of the NAND gate 91 becomes "0", and the output of the inverter 92 becomes "1". The output of holds "1". and,
When the time constant circuit 36 is charged and reaches the reference voltage V _L , the output 78 of the comparator 63 changes from "0" to "1" and the output of the NAND gate 93 changes from "1" to "0". This output is NOR due to “0”
Since the output of the gate 94 remains "0" and the output of the inverter 95 remains "1", the state of the NAND gate 96 does not change, and the compressor 4 continues to operate.

Then, when the room temperature in the control room 2 falls and reaches the set OFF temperature Y°C, the output 73 of the comparator 34 becomes "0".
The output 74 of the inverter 61 is also "0", thereby
Since the output of the NAND gate 96 changes from ``0'' to ``1'', the output 75 changes from ``1'' to ``0'' by the inverter 97, and the compressor 4 stops. Further, since the output of the inverter 90 also changes from "1" to "0", the output of the NAND gate 91 changes from "0" to "1", and the output 76 of the inverter 92 also changes from "1" to "0". Since the output 76 which is one input of the NOR gate 94 is "0", the period until the output of the NAND gate 93 changes from "0" to "1" (the time constant circuit 36 discharges and the reference level is Voltage V
It has a locking effect that does not change the state of the NAND gate 96 when it becomes _L (T ₂ hours). And said
After T ₂ hours have passed, the inverter 95 is set to "1" by the NOR gate 94, and enters a state in which it waits for and receives input from the comparator.

Next, when the room temperature is high and the compressor 4 is in operation, the power goes out and the power is turned on again, or the power switch 19 is turned off.
The operation of the voltage check circuit 62 when it is turned off and then turned on again within a relatively short time will be described. In this case, the voltage V _C of the time constant circuit 36 is the power supply voltage V _CC
This is a process in which something that was previously charged is being discharged. When the AC power is turned on again, a pulse is generated in the power supply reset circuit 40 as described above, and during the check period, the output of the inverter 89 is "0", the output of the NAND gate 91 is "1", and therefore the output 76 is It is "0". On the other hand, the voltage comparator 63 detects that the voltage V _C of the time constant circuit 36 is lower than the reference low voltage V _L so that V _C >V _L
Therefore, the output 78 is "1". counter 6
Since the first frequency division output 80 of the voltage comparator 63 has also been reset, it is "1", and the output of the NAND gate 93 is "0" during the period ( _T2 period) until the output 78 of the voltage comparator 63 falls to "0". ”, so this “0”
and the output 76 is "0", the NOR gate 94 is kept at "1", and therefore the inverter 95 is kept at "0". Therefore, the output of the NAND gate 96 is "1" during the _T2 period until the NOR gate 94 is inverted, and the inverter 97 is kept at "0" to reliably prohibit the restart of the compressor 4.

Next, operate the cooling/heating changeover switches 28 and 29 to select the heating mode, that is, the switch 2
We will explain what happens when 8 and 29 are turned on. In this state, the four-way valve 5 is turned on, and the outdoor or indoor heat exchangers 6 and 10 function so that the refrigerant flows in the opposite direction to the cooling direction to provide heat pump heating. Generally, when cooling and heating are performed using the same thermistor 23 and comparator 34, the output of the comparator 34 must be inverted. That is, when the room temperature is high during cooling, the comparator 34 must be turned on and the compressor 4 must be operated, but during heating, when the room temperature is high, the comparator 34 is turned on.
It turns on, but compressor 4 must be turned off. This inversion operation is performed by an inverter 61 consisting of an exclusive OR. First, when cooling, switch 2.
9 is OFF and the pin output 88 is configured to be "0". Therefore, the output 73 of comparator 34
When becomes "1", the output of the inverter 61 also becomes "1". Next, when the switch 26 is turned on to switch on heating, the pin output 88 is configured to become "1". Then, when the room temperature rises, the thermistor 23
As a result, the comparator 34 turns on and the output 73 becomes "1", but since the pin output 88 is also "1" and both partners are "1", the output 74 of the inverter 61 becomes "0" and the compressor 4 stop. When the room temperature falls, the comparator 34 turns off and the output 73 becomes "0", and since the pin output 88 is "1", the output 74 of the inverter 61 changes from "0" to "1". , the compressor 4 is operated.

In this way, by using the inverter 61 configured by exclusive OR, it is possible to select cooling or heating. Furthermore, by inserting the inverter 61 after the comparator 34, restarting can be prohibited for the _T2 period each time the compressor 4 stops.

Next, when the power switch 19 is turned on, the predetermined point of the bridge 33 is lowered by the pulse of the power reset circuit 40, and the new set ON temperature is set to X°C as shown in FIG.
An example of quickly operating the compressor 4 will be explained with reference to FIG. The reset pulse of the power supply reset circuit 40 is applied as an input to the differential circuit 35 (arrow RST in the figure), and this input turns on the differential circuit 35 and connects it in series with its built-in dummy resistor _R A gap resistor 44 is inserted and connected in parallel with the resistor 43. By using this room temperature startup check, it is possible to
The compressor 4 does not operate unless the room temperature is above .degree. C., but in this system, it operates when the set OFF temperature is above Y.degree. C..beta..degree. C., so the room temperature can be quickly controlled.

Further, the diode 77 shown in FIG. 5 blocks the discharge current of the time constant circuit 36 from flowing out from the pin when the power supply V _CC disappears due to a power outage or the like. In addition to the above-mentioned functions, this diode 77 also has the function of
The best method is to insert it at the fifth location, since it also works to compensate for the temperature characteristics of.

Above, in particular, explanation has been given of cooling and heating using the compressor 4, but the scope of the present invention also includes a heat source using a heater or thermal firing for heating. In addition, the present invention can be applied to cooling and heating food, etc., regardless of whether it is used for air conditioning or heating.

The temperature control device of the present invention has the following excellent effects.

(1) Detect room temperature with a thermistor, turn ON with a comparator,
In addition to turning off and controlling heat sources such as compressors,
The ON output of the comparator charges up to almost the power supply voltage, and the OFF output starts discharging.The timer output, which detects the voltage of a single time constant circuit and divides the frequency, and the output of the comparator, etc., are used to eliminate the heat source. Since the control logic is configured to operate in a set order,
It has the advantage that there is no discomfort after the heat source is stopped, it has a long lifespan, it can reliably eliminate the various drawbacks that occur when the heat source is restarted, and it is possible to realize a temperature control device that is inexpensive, compact, and accurately controls the heat source. .

(2) A single time constant circuit is used, and it has a discharge timer configuration, and a timer section and control logic that charges and discharges between the reference low voltage V _L and high voltage V _H and divides and counts, T ₁ To make time, T ₂ hours, the power is cut during the T ₁ period.Even if the power is turned on again, restarting of the heat source can be reliably prohibited, and moreover, after the T ₂ period, the gap temperature of the bridge is brought to β℃ or close to zero. Comfort can be improved.

(3) When the pulse of the power supply reset circuit for initial reset is used, and this pulse period is used as the period for checking the residual voltage of the time constant circuit, and the voltage of the time constant circuit during this period is lower than the reference low voltage V _L Since this is a voltage check circuit, the heat source is activated by the AND of the OFF output of the voltage comparator and the output of the comparator, and the AND output of this output and the output of the power supply reset circuit is used as the check output. The residual voltage in the time constant circuit can be checked and restart can be prohibited. Also, even when the comparator stops, restarting is reliably prohibited.

(4) By providing an inverter for cooling/heating switching consisting of an exclusive OR between the comparator and the load output circuit, cooling or heating can be selected by an external switching signal. Moreover, among the temperature control devices,
By integrating components including at least a comparator, an inverter, and a load output circuit, miniaturization and high reliability can be achieved, and since cooling and heating can be selected by operating external terminals, versatility is increased.

(5) The display will be lit continuously during the _T2 period when restarting the heat source such as the compressor is prohibited, but by blinking, the heat source such as the compressor will not restart even if the temperature setting is changed during this period. It also serves as a warning that the engine will not start, making it easier to use.

(6) When the power is turned on, a pulse from the power reset circuit lowers the bridge set point to the new set ON temperature X°C, allowing for quick operation.

(7) When the set point of the bridge that switches to T ₁ hour is set to the new constant ON temperature X℃, this gap temperature β℃
The desired gap temperature β° C. can be set by obtaining it with a built-in dummy resistor R _X of the differential circuit or with a constant voltage element such as a diode.

[Brief explanation of the drawing]

Fig. 1 is a system diagram of a heat source to which the temperature control device of the present invention is applied, Fig. 2 is an electrical wiring diagram of the temperature control device, Fig. 3 is a block diagram of the temperature control device, and Fig. 4 is a timing chart of the same. Figure 5 is the electrical circuit diagram of the temperature control device, Figure 6 is the operational waveform diagram,
FIG. 7 is an explanatory diagram of the voltage check circuit. 4... Compressor, 33... Bridge, 34... Comparator, 35... Differential circuit, 36...
... Time constant circuit, 37 ... Timer section, 38 ... Control logic, 39 ... Load output circuit, 40 ... Power supply reset circuit, 46 ... Capacitor.

Claims (1)

[Scope of Claims] 1. A heat source that performs cooling or heating including a compressor, and a bridge that detects the temperature of a controlled object such as a control room controlled by the heat source using a thermistor or the like;
a comparator that operates with the output of the bridge; at least one differential circuit that operates with the output of the comparator as input and provides a gap voltage of the bridge; When the voltage of a single time constant circuit including a capacitor that is charged and starts discharging based on the generation of off output falls to the reference low voltage V _L , it turns off,
A two-level voltage comparator that turns ON when the reference high voltage V _H is reached, a counter that is frequency-divided by the OFF output of this voltage comparator and outputs multiple frequency-divided outputs including a first frequency-divided output, and this counter. The charging control circuit charges the time constant circuit only during the period from the generation of the first frequency division output to the generation of the final frequency division (time-up) output using the OFF output of the two-level voltage comparator. The timer section is configured with a voltage check circuit that prohibits the restart of the heat source during the period from when the comparator turns OFF until the first frequency-divided output of the timer section is output. The frequency division (time-up) output operates a differential circuit and outputs an output that returns the gap voltage of the bridge to almost zero; a control logic that outputs an output that returns the gap voltage of the bridge to almost zero; and a load output circuit that drives the heat source with the output of the control logic. 1. A temperature control device comprising: a power reset circuit that emits a pulse for a predetermined period of time after power is turned on, and uses this pulse to maintain the control logic and the like in an initial state. 2 As a control logic, the voltage of a single time constant circuit that discharges after the comparator is turned off is the reference low voltage V _L
It turns OFF when the voltage drops to VH, and turns ON when it rises above the reference high voltage _VH .
The pulse period generated by the two-level voltage comparator and the power reset circuit when the power is turned on is used as a check period for detecting the residual voltage of the time constant circuit, and within this period, the voltage of the time constant circuit reaches the reference low voltage V. of the voltage comparator which emits when lower than _L.
A voltage check circuit of a time constant circuit that drives a load output circuit with an AND output of the OFF output and the output of the comparator, and uses an AND output of the AND output and the output of the power supply reset circuit as a check period. A temperature control device according to claim 1, characterized in that the temperature control device has: 3. The control logic includes an inverter for switching between cooling and heating, which is made up of an exclusive OR input of the output of the comparator and the selected output of cooling or heating, and a heat source control that operates by detecting the discharge pressure of the time constant circuit. and a timer section for the semiconductor integrated circuit, at least a portion including the comparator, an inverter for cooling/heating switching formed by an exclusive OR, and a load output circuit is implemented as a semiconductor integrated circuit, and the input/output of the semiconductor integrated circuit is The temperature control device according to claim 1, wherein one of the terminals is provided with a terminal that allows selection of cooling or heating, and the exclusive OR is controlled by this terminal so that it can be used commonly for cooling or heating. . 4 As a control logic, the voltage of a single time constant circuit that starts discharging after the comparator is turned off reaches the reference low voltage V _L , or the pulse period generated by the power reset circuit when the power is turned on.
the voltage of the time constant circuit is at a reference low voltage V _L ;
Claim 1, characterized in that the display circuit has a display circuit that outputs either lighting or blinking of the display section during the time until the discharge reaches the reference resistance voltage V _L after the discharge. Temperature control device as described. 5. Claims characterized in that the differential circuit inputs at least the output of the comparator and the pulse output generated by the power supply reset circuit when the power is turned on, so that the bridge gap voltage is almost zero. The temperature control device according to item 1. 6. As a differential circuit, detects the output of the comparator and the voltage of a single time constant circuit that starts discharging when the comparator is turned off, and performs frequency division operation,
The final frequency division (time-up) output of a timer section including a counter that generates a plurality of frequency division outputs including the first frequency division output and the pulse output generated by the power supply reset circuit are input, and the output of the comparator is A patent claim characterized in that a diode, a resistor, etc. are provided so that the gap voltage given by the final frequency division output or the output of the power supply reset circuit is set narrower than the gap voltage of the bridge thus determined. The temperature control device according to item 1.