JP6020212B2 - Power supply and power supply system - Google Patents

Description

  The present invention relates to a power supply device that is configured to be capable of being connected in series, and particularly suitable for charging a storage battery, and to a power supply system that is configured by connecting a plurality of power supply devices in series.

  As a configuration for connecting a plurality of power supply devices in series, a configuration disclosed in Patent Document 1 below is known. In this configuration, a backflow prevention diode and a diode for bypassing the output current (hereinafter also referred to as a bypass diode) are externally attached to the output terminal of each power supply device (DC / DC converter), and these two By connecting a plurality of power supply devices with external diodes connected in series, a current (load current) is output to the load.

  According to this configuration, even when one of the power supply devices stops operating, the output voltage of the power supply device that has stopped operating is the forward voltage (forward direction) of the backflow prevention diode externally attached to the power supply device. Voltage) and the bypass diode externally attached to this power supply device is turned on, so that this bypass diode functions as a detour and reduces the output current of other power supply devices in the operating state. By passing, the supply of the output current to the load is continued.

Japanese Patent Laid-Open No. 5-276636 (page 2-3, FIG. 1)

  However, the above power supply apparatus has the following problems to be solved. That is, in this power supply device, when a power supply system is configured by connecting a plurality of power supply devices in series, the power supply device is separately prepared for the number of power supply devices in which a backflow prevention diode and a bypass diode are connected in series, and There is a problem to be solved that each power supply apparatus must be externally attached and the work is complicated.

  The present invention has been made to solve such a problem, and a power supply device that can be used by simply connecting a plurality of backflow prevention diodes and bypass diodes in series without separately preparing them, and The main object is to provide a power supply system using a power supply device.

  In order to achieve the above object, a power supply device according to the present invention rectifies and smoothes a voltage induced in a secondary winding of a transformer due to intermittent application of a voltage to the primary winding of the transformer, thereby generating a DC voltage. And a rectifying / smoothing circuit that outputs the DC voltage between the positive output unit and the negative output unit, a positive output terminal and a negative output terminal for outputting the DC voltage to the outside, and a series connection terminal; A rectifying element for backflow prevention and a rectifying element for bypass, wherein the series connection terminal is connected to the positive output unit, the negative output terminal is connected to the negative output unit, and the backflow prevention rectification The element is connected between the positive output unit and the positive output terminal with a direction toward the positive output terminal as a forward direction, and the bypass rectifying element is interposed between the positive output unit and the negative output unit. The direction toward the positive output part is the forward direction. It is connected Te.

  Further, in the power supply device according to the present invention, the series connection terminal is connected to the positive output part via a bus bar made of a metal conductor, and the bus bar includes the backflow preventing rectifier element and the bypass rectifier element. By attaching at least one of the rectifying elements, it functions as a radiator of the at least one rectifying element.

  Further, the power supply device according to the present invention generates a DC voltage by rectifying and smoothing a voltage induced in the secondary winding of the transformer due to intermittent application of the voltage to the primary winding of the transformer. A rectifying / smoothing circuit that outputs a DC voltage between a positive output unit and a negative output unit, a positive output terminal and a negative output terminal for outputting the DC voltage to the outside, a terminal for series connection, and a rectifier for backflow prevention And a bypass rectifying element, the series connection terminal is connected to the negative output unit, the positive output terminal is connected to the positive output unit, and the backflow prevention rectifying element is the negative output unit. A direction toward the negative output unit is connected between the output unit and the negative output terminal as a forward direction, and the bypass rectifying element is connected to the positive output unit between the positive output unit and the negative output unit. Connected with forward direction as forward direction

  Further, in the power supply device according to the present invention, the series connection terminal is connected to the negative output part via a bus bar made of a metal conductor, and the bus bar is connected to the rectifier for backflow prevention and the rectifier for bypass. By attaching at least one of the rectifying elements, it functions as a radiator of the at least one rectifying element.

  Further, a power supply system according to the present invention includes a plurality of the power supply devices described above, and the plurality of power supply devices includes the negative output terminal of the power supply device on the high potential side and the power supply device on the low potential side. The series connection terminal is connected in series, and the added DC voltage of each power supply device is added to the positive output terminal of the power supply device arranged on the highest potential side, Output between the negative output terminal of the power supply device disposed on the low potential side.

  In addition, a power supply system according to the present invention includes a plurality of the power supply devices described above, and the plurality of power supply devices include the terminal for series connection of the power supply device on the high potential side and the power supply device on the low potential side. The positive output terminal is connected in series by being connected, and the added DC voltage of each power supply apparatus is the most positive output terminal of the power supply apparatus disposed on the highest potential side, Output between the negative output terminal of the power supply device disposed on the low potential side.

  In the power supply device of the present invention, the backflow preventing rectifying element is connected between the positive output part and the positive output terminal with the direction toward the positive output terminal as the forward direction, and the bypass rectifying element is connected to the positive output part and the negative output. The direction toward the positive output unit is connected to the unit as the forward direction.

  Therefore, according to this power supply apparatus, even when a plurality of units are connected in series and used as a power supply system, there is no need to prepare a rectifying element for backflow prevention and a rectifying element for bypass separately. Multiple units can be connected in series with extremely simple work. In addition, this power supply device includes a series connection terminal connected (directly connected) to the positive output portion without interposing a rectifying element. Therefore, a plurality of power supply devices are connected using the series connection terminal. By connecting the power supply system in series, the voltage drop due to the presence of the backflow preventing rectifying element can be suppressed to only the forward voltage of one backflow preventing rectifying element.

  According to the power supply device and the power supply system of the present invention, the serial connection terminal is connected to the positive output portion via the bus bar made of a metal conductor, and at least one of the backflow prevention rectifier and the bypass rectifier By attaching the rectifying element to the bus bar, the bus bar functions as a radiator of the at least one rectifying element, so that heat generated by the at least one rectifying element can be efficiently radiated.

  In the power supply device of the present invention, the backflow preventing rectifying element is connected between the negative output part and the negative output terminal with the direction toward the negative output part as the forward direction, and the bypass rectifying element is connected to the positive output part and the negative output. The direction toward the positive output unit is connected to the unit as the forward direction.

  Therefore, according to this power supply apparatus, even when a plurality of units are connected in series and used as a power supply system, there is no need to prepare a rectifying element for backflow prevention and a rectifying element for bypass separately. Multiple units can be connected in series with extremely simple work. In addition, this power supply device includes a series connection terminal connected (directly connected) to the negative output portion without interposing a rectifying element. Therefore, a plurality of power supply devices can be connected using the series connection terminal. By connecting the power supply system in series, the voltage drop due to the presence of the backflow preventing rectifying element can be suppressed to only the forward voltage of one backflow preventing rectifying element.

  Further, according to the power supply device and the power supply system of the present invention, the series connection terminal is connected to the negative output portion via the bus bar made of the metal conductor, and at least one of the backflow prevention rectifier and the bypass rectifier By attaching the rectifying element to the bus bar, the bus bar functions as a radiator of the at least one rectifying element, so that heat generated by the at least one rectifying element can be efficiently radiated.

1 is a configuration diagram showing a configuration of a power supply device 1. FIG. 6 is an explanatory diagram showing a state where the backflow preventing rectifying element 10 and the bypass rectifying element 11 are attached to the bus bar 15. FIG. 4 is an output characteristic diagram showing characteristics of output voltage with respect to output current of power supply devices 1 and 21. It is a block diagram which shows the structure of power supply system SY1. It is an output characteristic figure which shows the characteristic of the output voltage with respect to the output current of power supply system SY1, SY2. 3 is a configuration diagram showing a configuration of a power supply device 21. FIG. It is a block diagram which shows the structure of power supply system SY2.

  Hereinafter, embodiments of a power supply device and a power supply system will be described with reference to the drawings.

  1 includes, as an example, a positive input terminal 2, a negative input terminal 3, a rectifying and smoothing circuit 4, a switching circuit 5, a transformer 6, a rectifying circuit 7, a smoothing circuit 8, a control circuit 9, and a backflow preventing rectifying element. 10, a bypass rectifying element 11, a positive output terminal 12, a negative output terminal 13, a series connection terminal 14, and a bus bar 15, and an input voltage input between the positive input terminal 2 and the negative input terminal 3 (in this example) As an example, the converter is configured as an isolated converter that converts an AC voltage Vac (which may be a DC voltage) into a DC voltage Vdc and outputs it. As long as the power supply device 1 is an insulating converter, the power supply device 1 can be configured by various insulating converters such as a forward method, a flyback method, a bridge method, and a push-pull method.

  The rectifying / smoothing circuit 4 rectifies and smoothes the AC voltage Vac to convert it into a DC voltage and output it. When a DC voltage is input instead of the AC voltage Vac, a configuration using a smoothing circuit instead of the rectifying / smoothing circuit 4 can be adopted, and furthermore, when a ripple of the input DC voltage is small. Can adopt a configuration in which the rectifying and smoothing circuit 4 is omitted. The switching circuit 5 has a switch element (transistor, etc.) (not shown), and this switch element is controlled by the control circuit 9 to repeatedly turn on and off, thereby switching the DC voltage output from the rectifying and smoothing circuit 4. And intermittently applied to the transformer 6.

  As an example, the transformer 6 includes a primary winding 6a and a secondary winding 6b that are electrically insulated from each other. Further, the transformer 6 induces an AC voltage in the secondary winding 6 b due to intermittent application of the DC voltage to the primary winding 6 a by the switching circuit 5.

  The rectifier circuit 7 rectifies the alternating voltage induced in the secondary winding 6b, thereby converting it into a pulsating voltage and outputting it. The smoothing circuit 8 constitutes a rectifying / smoothing circuit in combination with the rectifying circuit 7, converts the pulsating voltage rectified by the rectifying circuit 7 into a DC voltage Vdc, and outputs the positive output unit 8a and the negative output. Output from between the unit 8b. The smoothing circuit 8 includes a voltage detection unit and a current detection unit (not shown). For example, the voltage detection unit is configured by a voltage dividing resistor circuit, detects the DC voltage Vdc, generates a voltage detection signal Sv whose voltage value changes according to the voltage value of the DC voltage Vdc, and supplies the voltage detection signal Sv to the control circuit 9. Output. Further, the current detection unit is configured with a detection resistor having a minute resistance value of, for example, less than 1Ω, and detects the DC current Idc output from the positive output unit 8a and the negative output unit 8b, and sets the current value of the DC current Idc. In response to this, a current detection signal Si whose voltage value changes is generated and output to the control circuit 9.

  The control circuit 9 calculates a current voltage value of the direct current voltage Vdc based on the voltage detection signal Sv, and calculates a current value of the current direct current current Idc based on the current detection signal Si. Further, the control circuit 9 determines that the direct current voltage Vdc and the direct current Idc are based on the calculated current value of the direct current voltage Vdc and the current value of the direct current current Idc as shown in FIG. ), That is, the switching element of the switching circuit 5 is controlled so as to have a constant current voltage drooping type overcurrent protection characteristic.

  Specifically, the control circuit 9 performs duty ratio control (or frequency control) on the switch element of the switching circuit 5 when the voltage value of the current DC voltage Vdc is less than a predetermined reference voltage value Vref. Thus, constant current control is performed to set the current value of the direct current Idc to a reference current value Iref defined in advance. Further, when the voltage value of the current DC voltage Vdc reaches the reference voltage value Vref, the control circuit 9 performs duty ratio control (or frequency control) on the switch element of the switching circuit 5 to thereby obtain the current DC voltage. Constant voltage control is performed to maintain the voltage value of Vdc at the reference voltage value Vref.

  The backflow preventing rectifying element 10 is configured by a diode as an example, and is connected in advance between the positive output portion 8a of the smoothing circuit 8 and the positive output terminal 12 with the direction toward the positive output terminal 12 being a forward direction. . The bypass rectifying element 11 is connected in advance between the positive output unit 8a and the negative output unit 8b of the smoothing circuit 8 with the direction toward the positive output unit 8a as the forward direction. Specifically, as shown in FIG. 2, the backflow preventing rectifying element 10 and the bypass rectifying element 11 include other electronic components (not shown), a positive output terminal 12, and a negative output terminal. 13 and the serial connection terminal 14 are mounted together on the circuit board 16 and connected in advance to the above-described portion (that is, built in the power supply device 1).

  In addition, at least one rectifying element (in this example, both rectifying elements 10 and 11) of the backflow preventing rectifying element 10 and the bypass rectifying element 11 is electrically insulated from the below-described bus bar 15 and is heated. It is mounted with good conductivity. With this configuration, the bus bar 15 functions as a radiator of this one rectifying element. In this example, as an example, the bus bar 15 is mounted on the circuit board 16 as shown in FIG.

  The series connection terminal 14 is connected to the positive output portion 8 a of the smoothing circuit 8. Specifically, the serial connection terminal 14 is connected to the positive output portion 8a via a bus bar 15 made of a metal conductor. The negative output terminal 13 is connected to the negative output unit 8 b of the smoothing circuit 8.

  Next, the operation of the power supply device 1 will be described with reference to an example in which a storage battery unit 50 (a unit configured by connecting a plurality of storage batteries in series), which is an example of a load, is charged.

  First, the operation | movement which charges the storage battery unit 50 with the one power supply device 1 is demonstrated. In this case, the positive output terminal 12 of the power supply device 1 is connected to the positive electrode of the storage battery unit 50, and the negative output terminal 13 is connected to the negative electrode of the storage battery unit 50.

  In this state, in the power supply device 1, when the current DC voltage Vdc is less than the reference voltage value Vref, the control circuit 9 uses the current value of the DC current Idc as a reference until the reference voltage value Vref is reached. The constant current control which is regulated to the current value Iref and output to the storage battery unit 50 is executed. Thereby, the storage battery unit 50 is charged with a constant current (reference current value Iref), and the charge voltage (that is, the DC voltage Vdc) of the storage battery unit 50 increases.

  Thereafter, when the voltage value of the charging voltage (DC voltage Vdc) of the storage battery unit 50 reaches the reference voltage value Vref, the control circuit 9 maintains the current voltage value of the DC voltage Vdc at the reference voltage value Vref. The constant voltage control for charging the unit 50 is executed. In this case, the current value of the current DC current Idc gradually decreases from the reference current value Iref, and the control circuit 9 determines that the current value of the current DC current Idc is a predetermined lower limit current value Imin (<reference current value). When reaching (Iref), the switching element of the switching circuit 5 is controlled to be in an OFF state, thereby stopping the operation of generating the DC voltage Vdc (the DC voltage Vdc becomes zero volts). Thus, charging of the storage battery unit 50 is completed, and the storage battery unit 50 is charged to a voltage (Vref−Vf1) obtained by subtracting the forward voltage (Vf1) of the backflow preventing rectifier 10 from the reference voltage value Vref.

  Next, as shown in FIG. 4, the operation of charging the storage battery unit 50 with the power supply system SY1 configured by connecting a plurality of (two in this example as an example) power supply devices 1 (1a, 1b) in series will be described. .

  In this case, as shown in the figure, each power supply device 1a, 1b is connected to the negative output terminal 13 of the high potential side power supply device 1a and the series connection terminal 14 of the low potential side power supply device 1b. Are connected in series with each other. Further, the positive output terminal 12 of the power supply device (power supply device 1a in this example) arranged on the highest potential side is connected to the positive electrode of the storage battery unit 50 by a connecting line, and the power supply device arranged on the lowest potential side. The negative output terminal 13 of the power supply device 1b (in this example) is connected to the negative electrode of the storage battery unit 50 by a connection line. Therefore, the DC voltage Vdc of each power supply device 1a, 1b is added and output to the storage battery unit 50 from between the positive output terminal 12 of the power supply device 1a and the negative output terminal 13 of the power supply device 1b.

  Since the power supply devices 1a and 1b are configured identically, each has the current-voltage characteristics shown in FIG. Therefore, the power supply system SY1 has the current-voltage characteristics shown in FIG. 5, that is, when the output voltage of the entire power supply devices 1a and 1b is less than the voltage value (Vref × 2) (that is, the DC voltage of each power supply device 1a and 1b). When the voltage value of Vdc is less than the reference voltage value Vref), constant current control is performed so that the current value of the current DC current Idc is set to a predetermined reference current value Iref, and the output of the entire power supply devices 1a and 1b is executed. When the voltage reaches the voltage value (Vref × 2) (that is, when the voltage value of the DC voltage Vdc of each power supply device 1a, 1b reaches the reference voltage value Vref), the voltage value of the current output voltage is changed. Constant voltage control is performed to maintain Vref × 2.

  In this state, in the power supply devices 1a and 1b (power supply system SY1), when each control circuit 9 has a current voltage value of the DC voltage Vdc lower than the reference voltage value Vref, the current voltage value Vref is reached until the current value reaches the reference voltage value Vref. The constant current control is performed in which the current value of the direct current Idc is defined as the reference current value Iref and output to the storage battery unit 50. Thereby, the storage battery unit 50 is charged with a constant current (reference current value Iref), and the charging voltage (that is, the DC voltage Vdc) of the storage battery unit 50 increases.

  After that, when the voltage value of the DC voltage Vdc of each power supply device 1a, 1b reaches the reference voltage value Vref, that is, when the voltage value of the charging voltage of the storage battery unit 50 reaches twice the reference voltage value Vref, The control circuit 9 executes constant voltage control for charging the storage battery unit 50 in a state where the voltage value of the current DC voltage Vdc is maintained at the reference voltage value Vref. In this case, the current value of the direct current Idc output from each power supply device 1a, 1b gradually decreases from the reference current value Iref. Each control circuit 9 controls the switching element of the switching circuit 5 to the OFF state when the current value of the current DC current Idc reaches the lower limit current value Imin (<reference current value Iref), so that the DC voltage Vdc is controlled. Is stopped (DC voltage Vdc becomes zero volts). Thereby, the charge with respect to the storage battery unit 50 by the power supply devices 1a and 1b (power supply system SY1) is completed.

  In the power supply system SY1, as described above, the plurality of power supply devices 1 including the series connection terminal 14 dedicated for series connection are connected to the negative output terminal 13 of the high potential side power supply device 1a and the low potential side power supply device 1b. Are connected in series in a state in which the backflow preventing rectifying element 10 of the low-potential-side power supply device 1b is bypassed, and connected to the highest potential-side power supply device (in this example, the power supply device). Current backflow is prevented only by the backflow preventing rectifier element 1a).

  Thereby, in this power supply system SY1, no matter how many power supply devices 1 are connected in series, a backflow preventing rectifier element is obtained from a voltage value obtained by multiplying the reference voltage value Vref by the number of power supply devices 1 (n). The storage battery unit 50 can be charged to a voltage (Vref × n−Vf1) obtained by subtracting the forward voltage (Vf1) corresponding to ten. Therefore, externally attached to each power supply device is a voltage value obtained by multiplying the reference voltage value Vref by the number (n) of power supply devices 1 as in the configuration in which the storage battery unit 50 is charged in the above-described conventional power supply device serial connection structure. Unlike the configuration in which the total voltage value of the forward voltage of all the backflow prevention rectifier elements 10 is reduced, a higher voltage can be obtained without externally attaching the backflow prevention rectifier element 10 and the bypass rectifier element 11 to each power supply device 1. It is possible to charge the storage battery unit 50 to the value.

  In the power supply system SY1, the output of the DC voltage Vdc from any one of the power supply devices 1 during charging of the storage battery unit 50 is performed in the same manner as the power supply system in which a plurality of power supply devices are connected in series with the conventional serial connection structure. In the case of stopping, the bypass rectifying element 11 provided in advance (incorporated) in the power supply device 1 shifts to the on state and bypasses the power supply device 1, so that the storage battery unit 50 Charging continues.

  Thus, in this power supply device 1, the backflow preventing rectifying element 10 is connected in advance between the positive output portion 8a of the smoothing circuit 8 and the positive output terminal 12 with the direction toward the positive output terminal 12 as the forward direction. The bypass rectifying element 11 is connected in advance between the positive output unit 8a and the negative output unit 8b of the smoothing circuit 8 with the direction toward the positive output unit 8a as the forward direction. Therefore, according to the power supply device 1, even when a plurality of power supply systems are connected in series and used as the power supply system SY1, there is no need to separately provide a rectifying element for backflow prevention and a rectifying element for bypass. Therefore, a plurality of units can be connected in series with an extremely simple operation.

  Moreover, according to this power supply device 1, since it has the terminal 14 for series connection connected (that is, connected directly) to the positive output part 8a of the smoothing circuit 8 without interposing a rectifier element, By connecting a plurality of terminals in series using the terminal 14, the voltage drop caused by the presence of the backflow preventing rectifying element 10 can be suppressed to only the forward voltage Vf corresponding to one backflow preventing rectifying element 10. .

  Further, according to the power supply device 1, at least one of the backflow preventing rectifying element 10 and the bypass rectifying element 11 (in this example, the backflow preventing rectifying element 10) is electrically connected to the bus bar 15. Since it is insulated and attached with a good thermal conductivity, the heat generated by the at least one rectifying element can be efficiently radiated.

  In the power supply device 1 described above, a configuration in which the series connection terminal 14 is connected to the positive output portion 8a is adopted. However, a configuration in which the power supply device 21 is connected to the negative output portion 8b as in the power supply device 21 shown in FIG. It can also be adopted. Hereinafter, the power supply device 21 will be described with reference to the drawings. In addition, about the structure same as the power supply device 1, the same code | symbol is attached | subjected and the overlapping description is abbreviate | omitted.

  6 includes, as an example, a positive input terminal 2, a negative input terminal 3, a rectifying / smoothing circuit 4, a switching circuit 5, a transformer 6, a rectifying circuit 7, a smoothing circuit 8, a control circuit 9, and a rectifier for backflow prevention. Element 10, bypass rectifier 11, positive output terminal 12, negative output terminal 13, series connection terminal 14, and bus bar 15, except for the backflow prevention rectifier 10, series connection terminal 14, and bus bar 15. The power supply device 1 has the same configuration. Hereinafter, different configurations will be mainly described.

  The backflow preventing rectifying element 10 is formed of a diode as an example, and is connected in advance between the negative output unit 8b and the negative output terminal 13 of the smoothing circuit 8 with the direction toward the negative output unit 8b as the forward direction. . The series connection terminal 14 is connected to the negative output portion 8 b of the smoothing circuit 8. Specifically, the serial connection terminal 14 is connected to the negative output portion 8b via a bus bar 15 made of a metal conductor. The positive output terminal 12 is connected to the positive output unit 8 a of the smoothing circuit 8.

  Next, operation | movement of the power supply device 21 is given and demonstrated about the example which charges the storage battery unit 50 which is an example of load.

  First, the operation | movement which charges the storage battery unit 50 with the one power supply device 21 is demonstrated. In this case, the power supply device 21 has its positive output terminal 12 connected to the positive electrode of the storage battery unit 50 and its negative output terminal 13 connected to the negative electrode of the storage battery unit 50. The power supply device 21 operates in the same manner as the power supply device 1 described above, and charges the storage battery unit 50 to a voltage (Vref−Vf1).

  Next, as shown in FIG. 7, an operation of charging the storage battery unit 50 with the power supply system SY2 configured by connecting a plurality (two in this example as an example) of power supply devices 21 (21a, 21b) in series will be described. .

  In this case, as shown in the figure, each power supply device 21a, 21b is connected to the series connection terminal 14 of the high potential side power supply device 21a and the positive output terminal 12 of the low potential side power supply device 21b. Are connected in series with each other. Further, the positive output terminal 12 of the power supply device (the power supply device 21a in this example) arranged on the highest potential side is connected to the positive electrode of the storage battery unit 50, and the power supply device (this example) arranged on the lowest potential side. Then, the negative output terminal 13 of the power supply device 21 b) is connected to the negative electrode of the storage battery unit 50. Therefore, the DC voltage Vdc of each power supply device 21a, 21b is added and output to the storage battery unit 50 from between the positive output terminal 12 of the power supply device 21a and the negative output terminal 13 of the power supply device 21b.

  In these power supply devices 21a and 21b (power supply system SY2), the backflow of current is prevented only by the backflow preventing rectifier 10 of the power supply device (power supply device 21b in this example) arranged on the lowest potential side. The battery unit 50 is charged to a voltage (Vref × n−Vf1) in the same manner as the power supply system SY1 described above. In this example, n = 2.

  Therefore, also in this power supply device 21, since the backflow preventing rectifying element 10 and the bypass rectifying element 11 are connected in advance in the same manner as the power supply device 1 described above, a plurality of them are connected in series and used as the power supply system SY2. Even in such a case, it is not necessary to prepare a rectifying element for backflow prevention and a rectifying element for bypass separately and attach them externally, so that a plurality of them can be connected in series with a very simple operation.

  In addition, since the power supply device 21 includes the series connection terminal 14 connected (that is, directly connected) to the negative output portion 8b of the smoothing circuit 8 without interposing a rectifying element, the series connection terminal 14 is provided. According to the power supply system SY2 configured by connecting a plurality of power supply devices 21 in series, the voltage drop caused by the presence of the backflow prevention rectifier 10 is reduced in the order of one backflow prevention rectifier 10. Only the directional voltage Vf can be suppressed.

  Further, according to the power supply device 21, at least one of the backflow preventing rectifying element 10 and the bypass rectifying element 11 (in this example, the backflow preventing rectifying element 10) is electrically connected to the bus bar 15. Since it is insulated and attached with a good thermal conductivity, the heat generated by the at least one rectifying element can be efficiently radiated.

DESCRIPTION OF SYMBOLS 1,21 Power supply device 6 Transformer 6a Primary winding 6b Secondary winding 8 Smoothing circuit 8a Positive output part 8b Negative output part 10 Backflow prevention rectifier 11 Bypass rectifier 12 Positive output terminal 13 Negative output terminal 14 Series connection Terminal 15 Busbar Vdc DC voltage

Claims (6)

DC voltage is generated by rectifying and smoothing the voltage induced in the secondary winding of the transformer due to intermittent application of voltage to the primary winding of the transformer, and the DC voltage is supplied to the positive output section and the negative output section. A rectifying / smoothing circuit that outputs to the outside, a positive output terminal and a negative output terminal for outputting the DC voltage to the outside, a series connection terminal, a backflow preventing rectifying element, and a bypass rectifying element ,
The series connection terminal is connected to the positive output unit,
The negative output terminal is connected to the negative output unit,
The backflow preventing rectifying element is connected between the positive output portion and the positive output terminal as a forward direction in the direction toward the positive output terminal,
The bypass rectifying element is a power supply device that is connected between the positive output unit and the negative output unit with a direction toward the positive output unit as a forward direction. The series connection terminal is connected to the positive output part via a bus bar made of a metal conductor,
2. The power supply device according to claim 1, wherein the bus bar functions as a radiator of the at least one rectifying element by attaching at least one rectifying element of the backflow preventing rectifying element and the bypass rectifying element. DC voltage is generated by rectifying and smoothing the voltage induced in the secondary winding of the transformer due to intermittent application of voltage to the primary winding of the transformer, and the DC voltage is supplied to the positive output section and the negative output section. A rectifying / smoothing circuit that outputs to the outside, a positive output terminal and a negative output terminal for outputting the DC voltage to the outside, a series connection terminal, a backflow preventing rectifying element, and a bypass rectifying element ,
The series connection terminal is connected to the negative output unit,
The positive output terminal is connected to the positive output unit,
The backflow preventing rectifying element is connected between the negative output portion and the negative output terminal as a forward direction toward the negative output portion,
The bypass rectifying element is a power supply device that is connected between the positive output unit and the negative output unit with a direction toward the positive output unit as a forward direction. The series connection terminal is connected to the negative output portion via a bus bar made of a metal conductor,
4. The power supply device according to claim 3, wherein the bus bar functions as a radiator of the at least one rectifying element by attaching at least one rectifying element of the backflow preventing rectifying element and the bypass rectifying element. 5. A plurality of power supply devices according to claim 1 or 2 are provided.
The plurality of power supply devices are connected in series by connecting the negative output terminal of the power supply device on the high potential side and the terminal for series connection of the power supply device on the low potential side, and the added power supply device The DC voltage of each power supply device is output between the positive output terminal of the power supply device arranged on the highest potential side and the negative output terminal of the power supply device arranged on the lowest potential side. Power system. A plurality of power supply devices according to claim 3 or 4 are provided.
The plurality of power supply devices are connected in series by connecting the series connection terminal of the power supply device on the high potential side and the positive output terminal of the power supply device on the low potential side, and the added power supply device The DC voltage of each power supply device is output between the positive output terminal of the power supply device arranged on the highest potential side and the negative output terminal of the power supply device arranged on the lowest potential side. Power system.

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