JP5507268B2 - Power supply - Google Patents

Description

  The present invention relates to a power supply device.

  Conventionally, power supply devices that output voltages having different polarities have been used (see, for example, Patent Document 1).

[Configuration of Power Supply Device 100]
FIG. 5 is a circuit diagram of a power supply device 100 according to a conventional example. The power supply apparatus 100 includes a transformer T, a primary side circuit 110, diodes D101 and D102, capacitors C101, C102, and C103, and relays R101 and R102.

  A primary circuit 110 is connected to both ends of the primary winding T1 of the transformer T. One end of the secondary winding T2 of the transformer T is connected to the anode of the diode D101 and the cathode of the diode D102. An output terminal OUT2 is connected to the other end of the secondary winding T2 of the transformer T. The cathode of the diode D101 is connected to the output terminal OUT1 via the relay R101 and to the output terminal OUT2 via the capacitor C101. The output terminal OUT1 is connected to the anode of the diode D102 via the relay R102, and the output terminal OUT2 is connected via the capacitor C102. The output terminal OUT1 and the output terminal OUT2 are connected via a capacitor C103.

[Operation of Power Supply Device 100]
The power supply device 100 having the above configuration causes a current to flow through the primary winding T1 of the transformer T by the primary side circuit 110, thereby generating a voltage in the secondary winding T2 of the transformer T. Compared with the other end of the secondary winding T2, one end of the secondary winding T2 of the transformer T is set to a high potential or a low potential. Then, by controlling the relays R101 and R102 by a control unit (not shown), the voltage of the secondary winding T2 of the transformer T is rectified, smoothed by the capacitor C103, and then output from the output terminal OUT1.

  Specifically, in a period in which one end of the secondary winding T2 of the transformer T is at a higher potential than the other end, the relay R101 is turned on and the relay R102 is turned off. Then, a positive voltage having a higher potential than the output terminal OUT2 is output from the output terminal OUT1 by the amount corresponding to the voltage of the secondary winding T2 of the transformer T.

  On the other hand, in a period in which one end of the secondary winding T2 of the transformer T is at a lower potential than the other end, the relay R101 is turned off and the relay R102 is turned on. Then, a negative voltage whose potential is lower than that of the output terminal OUT2 by the amount corresponding to the voltage of the secondary winding T2 of the transformer T is output from the output terminal OUT1.

Japanese Patent Laid-Open No. 11-243692

  The above-described relays R101 and R102 are provided with a mechanically operated mechanism unit, and the mechanism unit is driven to be turned on or turned off. For this reason, since the mechanism portion is worn by repeating mechanical operations, it is necessary to replace the relays R101 and R102 in accordance with the operation frequency and operation time of the mechanism portion, and the convenience is low.

  In view of the above problems, an object of the present invention is to improve the convenience of a power supply device that outputs voltages having different polarities.

The present invention proposes the following items in order to solve the above-described problems.
(1) The present invention includes a transformer, current supply means for supplying current to the primary winding of the transformer, and rectifying means for rectifying the voltage generated in the secondary winding of the transformer, and the voltage from the output terminal The rectifying means includes a first unidirectional element that allows a current to flow from one end of a secondary winding of the transformer toward the output terminal, and 2 of the transformer from the output terminal. A second unidirectional element that allows current to flow toward one end of the secondary winding, and an end of the secondary winding of the transformer is the first unidirectional element or the second unidirectional element. And a switching means adapted to be connected to the power supply, and a power supply device is proposed in which a first terminal having a first potential is connected to the other end of the secondary winding of the transformer. .

  According to the present invention, the power supply device is provided with a transformer, a current supply means for passing a current to the primary winding of the transformer, and a rectifying means for rectifying the voltage generated in the secondary winding of the transformer. It was decided to output voltage. Then, a first unidirectional element that flows current from one end of the secondary winding of the transformer to the output terminal and a second first flow of current to one end of the secondary winding of the transformer are supplied to the rectifier. A directional element and switching means were provided. The switching means connects one end of the secondary winding of the transformer to the first unidirectional element or the second unidirectional element. A first terminal that is a first potential is connected to the other end of the secondary winding of the transformer.

  Therefore, if each of the first unidirectional element and the second unidirectional element flows current from one end to the other end, the other end of the first unidirectional element and the second one An output terminal is connected to one end of the directional element. In addition, one end of the first unidirectional element and the other end of the second unidirectional element are connected to one end of the secondary winding of the transformer by a switching unit. Become.

  According to this, in a period in which one end of the secondary winding of the transformer is at a higher potential than the other end, the switching means causes one end of the first unidirectional element and one end of the secondary winding of the transformer to , The positive voltage having a higher potential than the first terminal can be output from the output terminal by the amount of the voltage generated in the secondary winding of the transformer.

  On the other hand, during the period in which one end of the secondary winding of the transformer is at a lower potential than the other end, the other end of the second unidirectional element and one end of the secondary winding of the transformer are switched by the switching means. By connecting, a negative voltage whose potential is lower than that of the first terminal can be output from the output terminal by the amount of voltage generated in the secondary winding of the transformer.

  According to the above, voltages having different polarities can be output without providing a component having a mechanically operated mechanism such as a relay. For this reason, since wear of the component parts due to repeated mechanical operations does not occur, it is not necessary to replace the component parts, and convenience can be improved.

  In addition, since the voltages having different polarities can be output without using a relay that is a relatively large component, the power supply device can be downsized as compared with the case of using a relay.

  (2) In the power supply device according to (1), the rectifier is connected in series to one end of the secondary winding of the transformer, and connected in parallel to the first series connector. Second series connection means, wherein the first series connection means is a first light receiving element that is the switching means, and the first unidirectionality connected in series to the first light receiving element. And the second series connection means includes a second light receiving element which is the switching means, and the second unidirectional element connected in series to the second light receiving element. The power supply device characterized by this is proposed.

  According to this invention, the rectifying means is provided with the first series connection means connected in series to one end of the secondary winding of the transformer, and the second series connection means connected in parallel to the first series connection means. . And the 1st light receiving element which is a switching means and the 1st one-way element connected in series to the 1st light receiving element were provided in the 1st series connection means. The second series connection means is provided with a second light receiving element which is a switching means, and a second unidirectional element connected in series with the second light receiving element.

  For this reason, by irradiating light to the first light receiving element and not irradiating light to the second light receiving element in a period in which one end of the secondary winding of the transformer is at a higher potential than the other end, When the first light receiving element is turned on and the second light receiving element is turned off, a positive voltage having a higher potential than the first terminal is output from the output terminal by the voltage generated in the secondary winding of the transformer. can do.

  On the other hand, in a period in which one end of the secondary winding of the transformer is at a lower potential than the other end, the first light receiving element is not irradiated with light, and the second light receiving element is irradiated with light. When the second light receiving element is turned off and the second light receiving element is turned on, a negative voltage having a potential lower than that of the first terminal is output from the output terminal by the amount of voltage generated in the secondary winding of the transformer. be able to.

  According to the above, an effect similar to the effect described above can be achieved.

  (3) The present invention proposes a power supply apparatus according to (1) or (2), wherein the rectifier includes a voltage doubler rectifier circuit.

  According to the present invention, the rectifier means includes the voltage doubler rectifier circuit. For this reason, a voltage twice as much as the voltage generated in the secondary winding of the transformer is output from the output terminal. Here, when the voltage doubler rectifier circuit is provided in the power supply apparatus 100 according to the conventional example shown in FIG. 5, it is necessary to use high voltage relays, which are relatively expensive components, as the relays R101 and R102. However, since the power supply device according to the present invention can output voltages having different polarities without providing the relays R101 and R102 using high-voltage relays, the manufacturing cost can be reduced.

  According to the present invention, since there is no component such as a relay that needs to be replaced, it is unnecessary to replace the component, and the convenience of the power supply device that outputs voltages having different polarities can be improved. In addition, the power supply device can be downsized as compared with the case where a relay is used.

1 is a circuit diagram showing a schematic configuration of a power supply device according to a first embodiment of the present invention. It is a circuit diagram of the power supply device. It is a circuit diagram of the power supply device which concerns on 2nd Embodiment of this invention. It is a circuit diagram of the power supply device which concerns on 3rd Embodiment of this invention. It is a circuit diagram of the power supply device which concerns on a prior art example.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the constituent elements in the following embodiments can be appropriately replaced with existing constituent elements, and various variations including combinations with other existing constituent elements are possible. Accordingly, the description of the following embodiments does not limit the contents of the invention described in the claims.

<First Embodiment>
[Configuration of Power Supply Device 1]
FIG. 1 is a circuit diagram showing a schematic configuration of a power supply device 1 according to the first embodiment of the present invention. The power supply device 1 is different from the power supply device 100 according to the conventional example shown in FIG. In the power supply device 1, the same components as those of the power supply device 100 are denoted by the same reference numerals and description thereof is omitted.

  The power supply device 1 includes, on the secondary side of the transformer T, a switching unit SW1 as switching means, a diode D11 as a first unidirectional element, a diode D12 as a second unidirectional element, and a capacitor C103. And comprising.

  A switching unit SW1 is connected to one end of the secondary winding T2 of the transformer T. The switching unit SW1 connects one end of the secondary winding T2 of the transformer T and either the anode of the diode D11 or the cathode of the diode D12. An output terminal OUT1 as an output terminal is connected to the cathode of the diode D11 and the anode of the diode D12.

  An output terminal OUT2 as a first terminal is connected to the other end of the secondary winding T2 of the transformer T. The output terminal OUT1 and the output terminal OUT2 are connected via a capacitor C103.

  FIG. 2 is a circuit diagram showing a detailed configuration of the power supply device 1. As shown in FIG. 2, the switching unit SW1 shown in FIG. 1 includes a phototransistor PC11 as a first light receiving element and a phototransistor PC12 as a second light receiving element.

  One end of the secondary winding T2 of the transformer T is connected to the collector of the phototransistor PC11, and the anode of the diode D11 is connected to the emitter of the phototransistor PC11. That is, the phototransistor PC11 and the diode D11 are connected in series.

  One end of the secondary winding T2 of the transformer T is connected to the emitter of the phototransistor PC12, and the cathode of the diode D12 is connected to the collector of the phototransistor PC12. That is, the phototransistor PC12 and the diode D12 are connected in series.

  And the 1st series connection part as the 1st series connection means which connected the phototransistor PC11 and the diode D11 in series, The 2nd series connection part as the 2nd series connection means which connected the phototransistor PC12 and the diode D12 in series Are connected in parallel.

[Operation of power supply 1]
In the power supply device 1 having the above configuration, a current is caused to flow through the primary winding T1 of the transformer T by the primary side circuit 110 as a current supply unit, similarly to the power supply device 100 according to the conventional example shown in FIG. Thus, a voltage is generated in the secondary winding T2 of the transformer T so that one end of the secondary winding T2 of the transformer T is set to a higher potential or a lower potential than the other end of the secondary winding T2 of the transformer T. Or Then, by controlling the first photodiode (not shown) provided in a pair with the phototransistor PC11 and the second photodiode (not shown) provided in a pair with the phototransistor PC12, the transformer T The secondary winding T2 is rectified and smoothed by the capacitor C103, and then output from the output terminal OUT1.

  Specifically, light is emitted from the first photodiode and light is not emitted from the second photodiode during a period in which one end of the secondary winding T2 of the transformer T is at a higher potential than the other end. I will do it. According to this, the phototransistor PC11 is turned on and the phototransistor PC12 is turned off. Then, the voltage of the secondary winding T2 of the transformer T is rectified, and a positive voltage having a higher potential than the output terminal OUT2 is output from the output terminal OUT1 by the amount of the voltage of the secondary winding T2 of the transformer T. .

  On the other hand, in a period in which one end of the secondary winding T2 of the transformer T is at a lower potential than the other end, light is not emitted from the first photodiode and light is emitted from the second photodiode. . According to this, the phototransistor PC11 is turned off and the phototransistor PC12 is turned on. Then, the voltage of the secondary winding T2 of the transformer T is rectified, and a negative voltage having a lower potential than the output terminal OUT2 is output from the output terminal OUT1 by the amount of the voltage of the secondary winding T2 of the transformer T. .

  According to the above power supply device 1, the following effects can be produced.

  The first photodiode and the second photodiode described above, the phototransistors PC11 and PC12 provided on the secondary side of the transformer T, the diodes D11 and D12, and the capacitor C103 are the conventional example shown in FIG. It does not have a mechanically operated mechanism such as the relays R101 and R102. For this reason, since wear due to repeated mechanical operations does not occur in the component parts, it is not necessary to replace the component parts, and convenience can be improved.

  Further, since the first photodiode and phototransistor PC11 and the second photodiode and phototransistor PC12 are smaller than the relays R101 and R102, respectively, the power supply device 1 is smaller than the power supply device 100. Can be

Second Embodiment
[Configuration of Power Supply Device 1A]
FIG. 3 is a circuit diagram of a power supply device 1A according to the second embodiment of the present invention. The power supply device 1A is different from the power supply device 1 according to the first embodiment of the present invention shown in FIGS. 1 and 2 in that a switching unit SW2 including phototransistors PC21 and PC22, diodes D21 and D22, and a capacitor C1. Furthermore, the point to prepare is different. In the power supply device 1A, the same components as those of the power supply device 1 are denoted by the same reference numerals and description thereof is omitted.

  The collector of the phototransistor PC11 and the emitter of the phototransistor PC12 are connected to one end of the secondary winding T2 of the transformer T via the capacitor C1, and the cathode of the diode D21, the anode of the diode D22, and , Are connected. The emitter of the phototransistor PC21 is connected to the anode of the diode D21, and the collector of the phototransistor PC22 is connected to the cathode of the diode D22. The collector of the phototransistor PC21 and the emitter of the phototransistor PC22 are connected to the other end of the secondary winding T2 of the transformer T.

  That is, the phototransistor PC21 and the diode D21, and the phototransistor PC22 and the diode D22 are connected in series, respectively, a third series connection unit in which the phototransistor PC21 and the diode D21 are connected in series, and the phototransistor PC22, The fourth series connection portion in which the diode D22 is connected in series is connected in parallel.

[Operation of Power Supply Device 1A]
In the power supply device 1A having the above configuration, a current is supplied to the primary winding T1 of the transformer T by the primary side circuit 110, similarly to the power supply device 1 according to the first embodiment of the present invention shown in FIGS. By flowing, a voltage is generated in the secondary winding T2 of the transformer T, and one end of the secondary winding T2 of the transformer T is set to a higher potential or lower than the other end of the secondary winding T2 of the transformer T. Or to a potential. A first photodiode (not shown) provided in a pair with the phototransistor PC11, a second photodiode (not shown) provided in a pair with the phototransistor PC12, and a phototransistor PC21 are provided in a pair. The voltage of the secondary winding T2 of the transformer T is doubled by controlling the third photodiode (not shown) and the fourth photodiode (not shown) provided in a pair with the phototransistor PC22. The voltage is rectified and smoothed by the capacitor C103, and then output from the output terminal OUT1.

  Specifically, first, the phototransistor PC21 is turned on by emitting light from the third photodiode in a period in which one end of the secondary winding T2 of the transformer T is at a lower potential than the other end. To do. Then, the capacitor C1 is charged by the voltage of the secondary winding T2 of the transformer T.

  Next, the phototransistor PC11 is turned on by emitting light from the first photodiode in a period in which one end of the secondary winding T2 of the transformer T is at a higher potential than the other end. Then, the above-mentioned inter-terminal voltage of the charged capacitor C1 and the voltage of the secondary winding T2 of the transformer T are superimposed, and the voltage is a maximum of twice the voltage of the secondary winding T2 of the transformer T. A positive voltage having a higher potential than the output terminal OUT2 is output from the output terminal OUT1.

  On the other hand, first, the phototransistor PC22 is turned on by emitting light from the fourth photodiode in a period in which one end of the secondary winding T2 of the transformer T is at a higher potential than the other end. Then, the capacitor C1 is charged by the voltage of the secondary winding T2 of the transformer T.

  Next, the phototransistor PC12 is turned on by emitting light from the second photodiode in a period in which one end of the secondary winding T2 of the transformer T is at a lower potential than the other end. Then, the above-mentioned inter-terminal voltage of the charged capacitor C1 and the voltage of the secondary winding T2 of the transformer T are superimposed, and the voltage is a maximum of twice the voltage of the secondary winding T2 of the transformer T. A negative voltage having a lower potential than the output terminal OUT2 is output from the output terminal OUT1.

  According to the above power supply device 1A, in addition to the above-described effects that can be achieved by the power supply device 1, the following effects can be achieved.

  The power supply device 1A includes phototransistors PC21 and PC22, diodes D21 and D22, and a capacitor C1, thereby performing voltage doubler rectification as described above. Here, also in the power supply device 100 according to the conventional example shown in FIG. 5, voltage rectification can be performed by providing the above-described phototransistors PC21 and PC22, diodes D21 and D22, and a capacitor C1. . However, when voltage doubler rectification is performed, a voltage twice as much as the maximum is applied to the relay R101, R102 that is in the ON state as compared with the case where rectification is performed. It is necessary to use a high voltage relay which is a relatively expensive component. However, since the power supply apparatus 1A does not include the relays R101 and R102 using high-voltage relays, the manufacturing cost can be reduced.

<Third Embodiment>
[Configuration of Power Supply Device 1B]
FIG. 4 is a circuit diagram of a power supply device 1B according to the third embodiment of the present invention. The power supply device 1B is different from the power supply device 1A according to the second embodiment of the present invention shown in FIG. In the power supply device 1B, the same components as those of the power supply device 1A are denoted by the same reference numerals, and the description thereof is omitted.

  Here, if a configuration including the switching unit SW1 and the diodes D11 and D12 is referred to as a specific connection unit, the voltage superimposing unit 10 is connected in parallel to the above-described specific connection unit. The voltage superimposing unit 10 includes switching units SW3 and SW4, diodes D31, D32, D41, and D42, and capacitors C2 and C3.

  The switching unit SW3 is connected to one end of the secondary winding T2 of the transformer T via capacitors C1 and C2. The switching unit SW3 connects one end of the secondary winding T2 of the transformer T and either the anode of the diode D31 or the cathode of the diode D32 via the capacitors C1 and C2. The output terminal OUT1 is connected to the cathode of the diode D31 and the anode of the diode D32.

  The switching unit SW4 is connected to the output terminal OUT1. The switching unit SW4 connects the output terminal OUT1 and either the anode of the diode D41 or the cathode of the diode D42. One end of the secondary winding T2 of the transformer T is connected to the cathode of the diode D41 and the anode of the diode D42 via capacitors C1 and C2.

[Operation of Power Supply Device 1B]
In the power supply device 1B having the above configuration, a current is caused to flow through the primary winding T1 of the transformer T by the primary side circuit 110, similarly to the power supply device 1A according to the second embodiment of the present invention shown in FIG. Thus, a voltage is generated in the secondary winding T2 of the transformer T so that one end of the secondary winding T2 of the transformer T is set to a higher potential or a lower potential than the other end of the secondary winding T2 of the transformer T. Or Then, by controlling the switching units SW1 to SW4, a positive voltage having a potential higher than that of the output terminal OUT2 by the maximum three times the voltage of the secondary winding T2 of the transformer T, and the secondary winding of the transformer T A negative voltage having a potential lower than that of the output terminal OUT2 is output from the output terminal OUT1 by a maximum of three times the voltage of T2.

  According to the power supply device 1B described above, it is possible to achieve the same effects as those described above that can be achieved by the power supply device 1A.

  The present invention is not limited to the above-described embodiment, and various modifications and applications can be made without departing from the gist of the present invention.

  For example, in the second embodiment described above, the phototransistors PC21 and PC22 are provided in the power supply device 1A. However, instead of the phototransistors PC21 and PC22, for example, a switch element formed of a MOSFET may be provided.

  Further, for example, in the above-described third embodiment, one voltage superimposing unit 10 is connected in parallel to the specific connecting unit including the switching unit SW1 and the diodes D11 and D12. Two or three units 10 may be connected in parallel. In this way, by changing the number of voltage superimposing units 10 connected in parallel to the specific connection unit described above, it is possible to arbitrarily set the positive voltage and the negative voltage output from the output terminal OUT1.

DESCRIPTION OF SYMBOLS 1, 1A, 1B, 100; Power supply device 10; Voltage superimposition part 110; Primary side circuit C1-C3, C101-C103; Capacitor D11, D12, D21, D22, D31, D32, D41, D42, D101, D102; Diodes OUT1, OUT2; output terminals PC11, PC12, PC21, PC22; phototransistors R101, R102; relays SW1-SW4; switching unit T: transformer

Claims (2)

A transformer, current supply means for supplying current to the primary winding of the transformer, rectifying means for rectifying the voltage generated in the secondary winding of the transformer, and one electrode at one end of the secondary winding of the transformer A power supply device including a connected capacitor and outputting a voltage from an output terminal,
The rectifying means includes
A first unidirectional element that allows current to flow from the other electrode of the capacitor toward the output terminal;
A second unidirectional element that allows current to flow from the output terminal toward the other electrode of the capacitor ;
A first switching means in which the other electrode of the capacitor is connected to the first unidirectional element or the second unidirectional element;
A third unidirectional element for passing a current from the other end of the secondary winding of the transformer toward the other electrode of the capacitor;
A fourth unidirectional element for passing a current from the other electrode of the capacitor toward the other end of the secondary winding of the transformer;
A second switching unit configured to connect the other end of the secondary winding of the transformer to the third unidirectional element or the fourth unidirectional element ;
A power supply apparatus, wherein a first terminal having a first potential is connected to the other end of the secondary winding of the transformer. The first switching unit includes a first light receiving element connected in series to the first unidirectional element, and a second light receiving element connected in series to the second unidirectional element. ,
The second switching unit includes a third light receiving element connected in series to the third unidirectional element, and a fourth light receiving element connected in series to the fourth unidirectional element. The power supply device according to claim 1.

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