JP4596791B2 - Power supply - Google Patents

Description

  The present invention relates to a power supply apparatus that supplies a commercial power supply voltage to an external device via an insulating transformer.

In general, when supplying commercial power to an external device such as a video printer in an electronic device such as an ultrasonic diagnostic apparatus, the commercial power is not supplied through to ensure safety such as leakage prevention, but is insulated. This is done through a power supply device including a transformer. In addition, in order to supply the external device with different commercial power supply voltages for each destination, it is possible to cope with universality by changing the configuration of the winding of the insulating transformer. As conventional examples, there are those disclosed in Patent Documents 1 and 2 below.
JP 2001-37774 A JP 2000-287442 A

  However, changing to a transformer having a winding configuration according to the voltage at the destination is cumbersome, and after developing a power supply device according to a voltage at a certain destination, for example, AC100V-120V, In order to correspond to the voltage of the destination, for example, AC 220V-240V, it takes time to modify the transformer and confirm safety.

By the way, in order to solve the above-mentioned problems, it is conceivable to use a transformer having a configuration that can handle the voltages of a plurality of commercial power sources for each destination, and to select a transformer configuration at the time of factory shipment.
In order to support two systems of commercial power supply voltage, two windings are used on the primary and secondary sides of one transformer. In the case of AC100V-120V, the primary and secondary sides of the transformer are connected in parallel. In the case of AC220V-240V, by connecting the primary side and the secondary side of the transformer in series, it is possible to cope with two commercial power supply voltages of AC100V-120V and AC220V-240V. However, this method involves the work of connecting each primary side and each secondary side of one transformer in parallel or in series, so that there is a problem that the work is complicated and connection errors are likely to occur, and the voltages are different. When resold between regions, there is a problem that the voltage of the resold destination cannot be handled.

  In view of the above-described problems of the conventional example, the present invention provides a universal power supply apparatus that can automatically cope with commercial power supplies having different voltages when supplying commercial power supply voltage to an external device via an insulation transformer. The purpose is to provide.

In order to achieve the above object, the present invention has a primary side winding connected to a commercial power source, a secondary side winding connected to an external device, and the configuration of the windings corresponding to a plurality of commercial power supply voltages. Insulating transformer means switchable to any one of them;
Detecting means for detecting the voltage of the commercial power supply;
Switching means for switching the configuration of the winding of the insulation transformer means so as to correspond to the voltage of the commercial power supply detected by the detection means;
Commercial power on / off means for turning on / off the supply of the commercial power to the external device after chattering at the time of switching of the switching means is completed,
The switching means is configured such that when the coil that drives the switching means is in a non-energized state and the voltage detected by the detection means is at least AC 220 to 240 V, the primary winding and the secondary winding are simultaneously connected in series. And when the coil is energized and the voltage detected by the detection means is at least 100 to 120 VAC, the primary winding and the secondary winding are respectively connected in parallel at the same time. did.
With this configuration, when a commercial power supply voltage is supplied to an external device via an insulation transformer, it is possible to automatically cope with a commercial power supply having a different voltage.

The present invention, the switching means has a configuration, wherein the relay der Rukoto.

Further, the present invention selects a plurality of fuses corresponding to each of the plurality of commercial power supply voltages and one of the plurality of fuses so as to correspond to the voltage of the commercial power supply detected by the detecting means. A fuse switching means for connecting to the device is further provided.
With this configuration, it is possible to ensure the safety of an external device with respect to commercial power sources having different voltages.

The present invention also includes voltage display means for displaying any of the voltages of the plurality of commercial power supplies, and voltage display switching means for switching the voltage display means to display the voltage of the commercial power supply detected by the detection means. Furthermore, it was set as the structure provided.
With this configuration, it is possible to prevent the user from connecting external devices having different commercial power supply voltages.

  According to the present invention, when a commercial power supply voltage is supplied to an external device via an insulation transformer, it is possible to automatically cope with commercial power supplies having different voltages.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a circuit diagram showing a transformer configuration in an embodiment of a power supply device according to the present invention. FIG. 1 shows, as an example, a configuration using a transformer T1 having two windings (coils) on each of the primary side and the secondary side in order to cope with two commercial power supply voltages of AC100V and AC230V. One input IN1 of the commercial power supply is connected to one primary terminal 11 of the winding C1 of the transformer T1 and one input terminal 31 of the relay contact K3, and the other primary terminal 12 of the winding C1 of the transformer T1 is The relay contact K4 is connected to the common contact 43 and the other input terminal 32 of the relay contact K3.

  The common contact 33 of the relay contact K3 is connected to one primary terminal 21 of the winding C2 of T1, and the other primary terminal 22 of the winding C2 of the transformer T1 is connected to the other input IN2 of the commercial power supply. ing. The other input IN2 of the commercial power supply is also connected to one input terminal 41 of the relay contact K4, and the other input terminal 42 of the relay contact K4 is an open end.

  One secondary terminal 13 of the winding C3 of the transformer T1 is connected to one output OUT1 of an outlet (not shown) for supplying commercial power to an external device and one output terminal 52 of a relay contact K5. The other secondary terminal 14 of T1 is connected to the other output terminal 53 of the relay contact K5 and the common contact 61 of the relay contact K6. One output terminal 62 of the relay contact K6 is connected to the other output OUT2 of an outlet (not shown), and the other output terminal 63 of the relay contact K6 is an open end. One secondary terminal 23 of the winding C4 of the transformer T1 is connected to the common contact 51 of the relay contact K5, and the other secondary terminal 24 of the transformer T1 is connected to the other output OUT2 of the outlet (not shown). ing.

  In the above configuration, the relay contacts K3, K4, K5, and K6 are connected in the state shown in the figure when the respective coils are not energized, and the primary and secondary sides of the transformer T1 are connected in series (AC220V-240V). In addition, when the respective coils are energized, the primary side and the secondary side of the transformer T1 are connected in parallel (in the case of AC100V-120V).

  Here, the relay contacts K3, K4, K5, and K6 cause chattering at the start of energization and at the end of energization, so that the winding configuration of the transformer T1 fluctuates during the chattering period and adversely affects external devices. Become. Furthermore, there is a risk that the primary and secondary windings will be connected to instantaneous AC100V-120V even though the input voltage is AC220V-240V, the transformer operation enters the saturation region, and the primary side has a large current. Begins to flow. With this large current, the overcurrent protection circuit equipped as a protection function acts on the input of the ultrasonic diagnostic apparatus, and it has an adverse effect. This chattering is performed when the power switch of the electric / electronic device (for example, an ultrasonic diagnostic apparatus) having this power supply device is provided on the input IN1 and IN2 side of the commercial power supply, This occurs when the power plugs on the IN1 and IN2 sides of the commercial power supply are inserted and removed, or when the commercial power supply is interrupted / restored.

Therefore, in the present embodiment, as shown in FIGS. 2 and 3, relay contacts K1 and K2 are further provided in front of the switching means constituted by the relay contacts K3 and K4, and the relay contacts K3 and K4 (and K5 and K6) are provided. ) In the chattering period 7-10 ms (<delay time (for example, 15-100 ms)), the relay contacts K1, K2 are turned off, and the relay contacts K1, K2 are turned on after the output voltage of the transformer T1 is stabilized. Yes. In this way, when a commercial power supply voltage is supplied to an external device via an insulation transformer, a universal power supply apparatus that can automatically cope with a commercial power supply having a different voltage can be provided.
Since the winding configuration of the transformer T1 is stable during the chattering period of the relay contacts K1 and K2, the chattering of the relay contacts K1 and K2 is absorbed by the power supply device on the external device side and does not have an adverse effect.

FIG. 4 shows a circuit for detecting the commercial power supply voltage and controlling the relay contacts K1, K2, K3 to K6. Further, the relay contacts K1 and K2 are turned off in the chattering period at the start of energization of the relay contacts K3 to K6. A circuit to be turned on after chattering is shown. First, the AC of the commercial power supply is voltage doubled rectified by the diodes D1 and D2, and the DC voltage V is applied to the voltage dividing resistors R1, R2, and R3. The comparator COMP1 is
V × (R2 + R3) / (R1 + R2 + R3)
And the reference voltage E are compared to detect AC100V-120V or AC220V-240V. The 100V-120V / 220V-240V switching relay drive circuit 101 controls the relay contacts K3 to K6 based on the detection result of the comparator COMP1.

The comparator COMP2 is
V × R3 / (R1 + R2 + R3)
And the reference voltage E are compared to detect whether the voltage is AC100V-120V or more, and the transformer connection on / off relay drive circuit 102 controls the relay contacts K1 and K2 based on the detection result of the comparator COMP2. To do.

  Here, when the commercial power supply voltage fluctuates and the voltage V fluctuates with respect to the reference voltage E of the comparators COMP1 and COMP2, the detection results of the comparators COMP1 and COMP2 fluctuate unnecessarily. Therefore, the comparators COMP1 and COMP2 have hysteresis due to the feedback resistors R4 and R5. For example, as shown in FIG. 5, the comparator COMP1 determines that AC220V-240V is greater than 145V with respect to the reference voltage E = 130V (detection result = L In the case of 115V or less, it is determined that AC100V-120V is detected (detection result = H), and AC115V to 145V is configured to depend on hysteresis.

  Returning to FIG. 4, when the standby switch SW <b> 1 is turned on, the commercial power supply is full-wave rectified by the diode bridge D <b> 3, and this DC voltage is passed through the switching power supply 103 to the electrical / electronic device (for example, ultrasonic diagnosis) having this power supply device. Device) to the necessary circuits. The power supply of the comparator COMP2 is supplied to the delay circuit 104 by supplying the output of the switching power supply 103, and is supplied after the chattering period of the relay contacts K3 to K6 by the delay circuit 104 (and the switch SW2). Thereby, the relay contacts K1 and K2 can be turned on after the chattering of the relay contacts K3 to K6 is completed.

  FIG. 6 shows a configuration in which a fuse f1 for 100V-120V, a fuse f2 for 220V-240V and a relay contact K7 are added to the secondary side of the configuration shown in FIG. . With this configuration, it is possible to ensure the safety of an external device with respect to commercial power sources having different voltages. Further, in FIG. 7, an AC100V-120V display lamp L1 and an AC220V-240V display lamp L2 are added to the secondary side of the configuration shown in FIG. 6, and the lamp L1 or L2 is turned on by the relay contact K7 to voltage. The structure which alert | reports a mode to a user is shown. With this configuration, it is possible to prevent the user from connecting an external device that does not support the commercial power supply voltage.

  Here, in the configuration shown in FIG. 4, since power supply to an external device (not shown) is interlocked under the influence of the state of the standby switch SW1, it is possible to supply power to the external device that is interlocked with the operation of the device body. Become. FIG. 8 shows a modification of FIG. 4. Instead of the delay circuit 104 in FIG. 4, a delay circuit 105 is provided between the comparator COMP2 and the transformer connection on / off relay drive circuit 102 to turn on the relay contacts K1 and K2. The structure which delays time to make is shown. According to this configuration, since the power supply to the external device is not affected by the state of the standby switch SW1, the power supply to the external device that is not related to the operation of the device main body is possible as compared with the configuration shown in FIG. It becomes.

  FIG. 9 shows a configuration in which a switch SW3 interlocked with the standby switch SW1 is provided between the comparator COMP2 and the delay circuit 105 as shown in FIG. The switch SW3 is preferably a semiconductor element that double-insulates the primary side and the secondary side together with the transformer T1, for example, a photocoupler.

  The present invention has an effect that when a commercial power supply voltage is supplied to an external device via an insulation transformer, it can automatically cope with a commercial power supply having a different voltage. Therefore, it can be used for an electronic device that must be supplied to an external device to ensure safety, for example, a medical device such as an ultrasonic diagnostic apparatus.

The circuit diagram which shows the transformer structure in one Embodiment of the power supply device which concerns on this invention The block diagram which shows the structure of one Embodiment of the power supply device which concerns on this invention Timing chart for explaining the operation of the relay of FIGS. The block diagram which shows the voltage detection circuit of the power supply device which concerns on this invention Explanatory drawing which shows the hysteresis of the comparator of FIG. The block diagram which shows the modification of the power supply device which concerns on this invention The block diagram which shows the other modification of the power supply device which concerns on this invention FIG. 4 is a block diagram showing a modification of the voltage detection circuit of FIG. The block diagram which shows the other modification of the voltage detection circuit of FIG. Explanatory drawing which shows voltage switching by the voltage detection circuit of FIG.

Explanation of symbols

101 100V-120V / 220V-240V switching relay drive circuit 102 transformer connection on / off relay drive circuit 103 switching power supply 104, 105 delay circuit COMP1, COMP2 comparator D1, D2 diode D3 diode bridge f1, f2 fuse K1-K7 relay Contact L1 AC100V-120V display lamp (lamp)
L2 AC220V-240V display lamp (lamp)
R1, R2, R3 Voltage dividing resistor R4, R5 Feedback resistor SW1 Standby switch SW2, SW3 switch T1 Isolation transformer

Claims (4)

Insulation transformer means in which the primary side winding is connected to a commercial power source, the secondary side winding is connected to an external device, and the configuration of the winding can be switched to any one corresponding to a plurality of commercial power supply voltages When,
Detecting means for detecting the voltage of the commercial power supply;
Switching means for switching the configuration of the winding of the insulation transformer means so as to correspond to the voltage of the commercial power supply detected by the detection means;
Commercial power on / off means for turning on / off the supply of the commercial power to the external device after chattering at the time of switching of the switching means is completed,
The switching means is configured such that when the coil that drives the switching means is in a non-energized state and the voltage detected by the detection means is at least AC 220 to 240 V, the primary winding and the secondary winding are simultaneously connected in series. The primary winding and the secondary winding are connected in parallel at the same time when the coil is energized and the voltage detected by the detection means is at least 100 to 120 VAC. Power supply. It said switching means power supply device according to claim 1, wherein the relay der Rukoto.   A plurality of fuses corresponding to each of the plurality of commercial power supply voltages, and a fuse for selecting one of the plurality of fuses to correspond to the voltage of the commercial power supply detected by the detecting means and connecting to the external device The power supply device according to claim 1, further comprising switching means.   A voltage display means for displaying one of the voltages of the plurality of commercial power supplies, and a voltage display switching means for switching the voltage display means to display the voltage of the commercial power supply detected by the detection means. The power supply device according to any one of 1 to 3.