JP6923568B2 - Voltage controller, power supply, power supply and voltage control method - Google Patents

Description

The present invention relates to a method of suppressing a decrease in output from a power source.

In the case of a power supply having redundancy by connecting a plurality of power supply modules in parallel, an orling element is generally inserted into an output unit from each power supply module from the viewpoint of preventing backflow of current (Patent Document 1). reference).

FIG. 1 is a conceptual diagram showing a configuration of a power supply 100, which is a general example of a power supply having a redundant configuration.

The power supply 100 shown in FIG. 1 has a redundant configuration by two power supply modules connected in parallel. The power supply 100 is, for example, a power supply for a server.

As shown in FIG. 1, the power supply 100 includes power supply modules 101a and 101b.

To each of the power modules 101a and 101b (each power module) voltage _{V in} a common input voltage is input. _{Each power supply module is expected to output a voltage V out} , which is the same output voltage, to the load 201. In the power supply 100, even if the output from one of the power supply modules 101a and 101b is stopped, if the output from the other is maintained, _{the supply of the voltage V out} to the load 201 is continued.

The number of current modules included in the power supply 100 and connected in parallel to each other may be three or more.

FIG. 2 is a conceptual diagram showing the configuration of the power supply module 101, which is an example of each power supply module shown in FIG.

The power supply module 101 includes a voltage control unit 103, a voltage adjustment unit 106, a voltage detection unit 111, an oring element 120, an FET control unit 131, and a current detection unit 146. Here, FET is an abbreviation for Field Effect Transistor.

The oring element 120 includes a diode 121 and an FET 116.

Voltage detecting unit 111 sends a signal S2 representative of the voltage _{V m} is the output voltage from the voltage regulator 106 to the voltage control unit 103. The voltage detecting unit 111 may be a voltage _{V m} itself as the contents of the signal S2. In that case, the voltage detection unit 111 is _{a conductor such as a wiring that transmits the voltage V m} and does not have a configuration for detecting the voltage.

The voltage control unit 103 sequentially sends the signal S1 which is a control signal for bringing the _{voltage V m} represented by the signal S2 closer to the voltage Vs1 which is a set value for the voltage V _{m to the voltage adjusting unit 106.} As the signal S1, a well-known control signal generally used to bring the output voltage close to the set value can be used.

The voltage adjusting unit 106 is, for example, a DC-DC converter or an AC-DC converter. Here, DC is an abbreviation for Direct Current. AC is an abbreviation for Alternating Current.

If the voltage adjustment unit 106 is a DC-DC converter, the voltage _{V in} is the input voltage is a DC voltage. If the voltage adjustment unit 106 is a AC-DC converter, the voltage _{V in} is an AC voltage. _{The voltage V m,} which is the output voltage from the voltage adjusting unit 106, is a DC voltage.

Voltage adjustment unit 106 includes, for example, a variable resistor for changing the voltage V _m which is the output voltage. In that case, the voltage adjusting unit 106 adjusts the value of the voltage V _m by changing the resistance value of the variable resistor according to the signal S1.

The current detection unit 146 detects the current value I _out of the output current from the oring element 120. The current detection unit 146 sends a signal S7, which is a signal representing the _{current value I out, to the FET control unit 131.}

FET controller 131, it is determined whether the current value _{I out} expressed by the signal S7 is sent from the current detection unit 146 exceeds the threshold value _{I th.} FET controller 131, when it is determined that the current value _{I out} exceeds the threshold _{I th,} the signal S4 to be sent to the gate of the FET 116, the source - level which conduction between the drain (hereinafter, "on-level" ). FET controller 131, when it is determined that the current value _{I out} is below the threshold value _{I th,} the signal S4 to be sent to the gate of the FET 116, the source - level to insulate the drain (hereinafter, referred to as "off level" .). This operation is a general control performed on the oring element including the FET in the power supply module.

The FET 116 conducts the source and the drain while the signal S4 sent from the FET control unit 131 is on-level. The FET 116 insulates the source and drain while the signal S4 is off-level.

The diode 121 may be a body diode included in the oring element 120 attached to the FET 116.

JP-A-2015-192301

_{FIG. 3 is a diagram showing a time change of the voltage V out} , which is the output voltage of the power supply module 101 shown in FIG. 2, when the FET 116 shifts from the on state to the off state in the power supply module 101 shown in FIG. Here, the ON state is a state in which the FET 116 conducts between the source and the drain. Further, the off state is a state in which the FET 116 insulates between the source and the drain.

The voltage V _out drops by the voltage Vf when the FET 116 shifts from the on state to the off state at time t1. The reason will be described with reference to FIG.

FIG. 4 is an image diagram showing the main current paths in the oring element 120 shown in FIG. 2 in each of the cases where the FET 116 is in the on state and the off state.

The current input from the voltage adjusting unit 106 to the oring element 120 is diverted between the source and drain of the diode 121 and the FET 116, then merges and flows to the current detecting unit 146.

When the FET 116 is in the ON state, its source-drain resistance R _FON is almost zero. On the other hand, in general, the forward resistance R _D of the diode 121 has a certain value. Therefore, when the FET 116 is in the ON state, most of the current flowing from the voltage adjusting unit 106 to the current detecting unit 146 passes between the source and the drain of the FET 116, as shown in FIG. 4A. Since the resistance R _FON is almost zero, when the FET 116 is in the ON state, the voltage drop in the oring element 120 hardly occurs.

When the FET 116 is in the off state, its source and drain are isolated. _{Alternatively, the resistance R FON} between the source and the drain when the FET 116 is off is a large value according to the insulation. Therefore, as shown in FIG. 4B, most of the current flowing from the voltage adjusting unit 106 to the current detecting unit 146 passes through the diode 121. As described above, the forward resistance R _D of the diode 121 has a certain value. Therefore, when the FET 116 is in the off state, _{the voltage drops by the voltage obtained by multiplying the resistor RD} by the value of the current passing through the diode 121. The voltage corresponding to the voltage drop is the voltage Vf shown in FIG.

Here, the magnitude of the voltage Vf in FIG. 3 is at a level that does not pose a problem depending on the circuit included in the load 201 shown in FIG. However, it can be assumed that the circuit included in the load 201 shown in FIG. 1 is sensitive to a voltage drop. In that case, a problem occurs in the load 201 due to the voltage drop of the voltage Vf shown in FIG.

An object of the present invention is to provide a power supply module or the like that can further suppress the occurrence of defects that occur in a load due to a decrease in output.

The control device of the present invention comprises the insulation between the source and drain of the field effect transistor of the parallel connection circuit of the field effect transistor and the diode connected in series in the direction of the current flowing in the subsequent stage to the subsequent stage of the voltage adjusting unit. When switching between continuity, the sending unit that sends the first or second information, the addition of the absolute value of the output voltage of the voltage adjusting unit based on the first information, and the addition based on the second information, respectively. It is provided with a control unit that controls the output voltage including the release of.

The power supply module and the like of the present invention can further suppress the occurrence of defects that occur in the load due to the decrease in output.

It is a conceptual diagram which shows the general configuration example of the power supply which has a redundant structure. It is a conceptual diagram which shows the general configuration example of a power supply module. It is an image diagram which shows the time change of the output voltage of a general power supply module. It is an image diagram which shows the current path in an oring element. It is a conceptual diagram which shows the structural example of the power supply module of 1st Embodiment. It is a conceptual diagram which shows the structural example of the voltage control part of 1st Embodiment. It is an image diagram which shows the time change of the output voltage of the power supply module of 1st Embodiment. It is a conceptual diagram which shows the structural example of the power supply module of 2nd Embodiment. It is a block diagram which shows the minimum structure of the control apparatus of embodiment.

<First Embodiment>
This embodiment relates to a power supply module that adjusts the level of the output voltage from the voltage adjusting unit in conjunction with turning on / off of the FET included in the oring element of the power supply module.

An example of the configuration of the power supply of this embodiment is the configuration of the power supply 100 shown in FIG.

FIG. 5 is a conceptual diagram showing the configuration of the power supply module 101, which is an example of each power supply module of the present embodiment shown in FIG.

The description of the power supply module 101 shown in FIG. 5 is the same as the description of the power supply module 101 shown in FIG. 2 except for the following description. Hereinafter, a portion of the power supply module 101 shown in FIG. 5 that differs from the power supply module 101 shown in FIG. 2 will be described. If the following explanation differs from the explanation in the background technology section, the following explanation will take precedence.

The FET control unit 131 shown in FIG. 5 interlocks with the timing of switching the signal S4 sent to the FET 116 between the on-level and the off-level, and outputs the signal S3 indicating whether the switched content is the on-level or the off-level to the voltage control unit 103. Send to. The signal S3 may be the signal S4 itself.

Voltage control unit 103, the content represented by the signal S3 when switched to the off level from the on-level, the reference voltage for the voltage _{V m} to be used for voltage control of the voltage _{V m,} to the voltage _{V msoff.} The voltage V _msoff is obtained by adding the voltage Vf shown in FIG. 3 to the _{voltage V mson} , which is the reference voltage when the signal S4 is on level. The voltage adjusting unit 106 generates a signal S1 which is a control signal for causing the _{voltage adjusting unit 106 to adjust the voltage V m} so as to approach the _{reference voltage (VMson} or _{Vmsoff), and sends the signal S1 to the voltage adjusting unit 106.} The control signal is generally used when the voltage is brought close to the set value.

On the other hand, when the content represented by the signal S3 is switched from the off level to the on level, the voltage control unit 103 sets the reference voltage to _VMson .

FIG. 6 is a conceptual diagram showing a configuration example of the voltage control unit 103 shown in FIG.

The voltage control unit 103 shown in FIG. 6 includes a control circuit 102, a differential amplifier 104, and a selection unit 105.

In FIG. 6, it is assumed that the signal S4 is the signal S3 itself. Further, it is assumed that the signal S8 is the reference voltage itself with respect to the _{voltage V m.} Further, the content of the signal S2 is the same as the voltage V _m (that is, the voltage detection unit 111 _{passes the voltage V m} as it is).

The selection unit 105 includes power supplies 311 and 312, FETs 301 and 302, and a negative element 306.

The power supply 311 supplies the FET ₃₀₁ with a voltage V mson, which is a reference voltage for the _{voltage V m} when the FET 116 is on.

The power supply 312 supplies the FET ₃₀₂ with a voltage VMsoff, which is a reference voltage for the _{voltage V m} when the FET 116 is in the off state. The voltage V _msoff is a voltage value obtained by adding the voltage Vf shown in FIG. 3 to the voltage V _mson.

While the signal S3 (= S4) is on-level, an on-level signal is input to the gate of the FET 301. As a result, the FET 301 short-circuits its source and drain. _{Therefore, the voltage VMson} is supplied from the power supply 311 to the differential amplifier 104 as the signal S8.

While the signal S3 (= S4) is on-level, an off-level signal is input to the gate of the FET 302. Therefore, the FET 302 insulates between its source and drain. _{Therefore, the voltage VMsoff} is not supplied from the power supply 312 to the differential amplifier 104.

On the other hand, while the signal S3 (= S4) is off-level, an off-level signal is input to the gate of the FET 301. Therefore, the FET 301 insulates between its source and drain. _{Therefore, the voltage V mson} is not supplied from the power supply 311 to the differential amplifier 104.

While the signal S3 (= S4) is off-level, an on-level signal is input to the gate of the FET 302. Therefore, the FET 302 short-circuits its source and drain. _{Therefore, the voltage VMsoff} is supplied from the power supply 312 to the differential amplifier 104 as the signal S8.

_{The differential amplifier 104 inputs an output corresponding to the difference between the voltage V m} shown in FIG. 5 which is the signal S2 and the _{voltage V mson} or the voltage V _m sof which is the signal S8 and the reference voltage to the control circuit 102 as the signal S9. ..

The control circuit 102 generates a signal S1 in response to a voltage value in the signal S9 input from the differential amplifier 104, and inputs the signal S1 to the voltage adjusting unit 106.

FIG. 7 is an image diagram showing a time change _{of the voltage V out} when the FET 116 shown in FIG. 5 shifts from the on state to the off state.

When the FET 116 shifts from the on state to the off state at time t1, the voltage V _out starts to decrease. The reason for this is as described with reference to FIG. On the other hand, at time t1, the voltage control unit 103 shown in FIG. 5 switches the reference voltage for the voltage V _m from the voltage V _{mson to the voltage V m sof.} The voltage V _msoff is higher than the voltage V _mson by the voltage Vf. Since the voltage control unit 103 controls the _{voltage V m} by the voltage V _{m sof} , the voltage V _out is adjusted to the value before the FET 116 is switched off after the time t1.
[effect]
In the power supply module of the present embodiment, when the FET included in the oring element shifts from the on level to the off level, a reference voltage for controlling the output voltage from the voltage adjusting unit is added. The additional width is the amount of voltage drop that occurs in the oring element due to the transition of the FET from the on-level to the off-level. Therefore, the voltage drop caused by the transition of the FET included in the oring element from the on level to the off level is eliminated. Therefore, the power supply module can further suppress the occurrence of malfunctions that occur in the load due to the voltage drop that occurs in the oring element due to the transition of the FET from the on level to the off level.
<Second embodiment>
The second embodiment is an embodiment relating to a power supply in which each power supply module is controlled to approach the value of the output current with the other power supply modules.

The configuration example of the power supply of the present embodiment is a configuration example of the power supply 100 of the first embodiment shown in FIG.

FIG. 8 is a conceptual diagram showing the configuration of the power supply module 101, which is an example of each power supply module of the present embodiment shown in FIG.

The description of the power supply module 101 shown in FIG. 8 is the same as the description of the power supply module 101 shown in FIG. 5, except for the following description. Hereinafter, the parts of the power supply module 101 shown in FIG. 8 that are different from the power supply module 101 shown in FIG. 5 will be described. If the following description differs from the description of the first embodiment, the following description takes precedence.

The current detection unit 146 detects the current value I _out of the output current from the oring element 120. The current detection unit 146 sends _{a signal S7, which is a signal representing the current value I out} , to the FET control unit 131 and the current balance unit 151.

_{The current balance unit 151 sends the signal S8, which is a signal representing the current value I out} represented by the signal S7 sent from the current detection unit 146, to the current balance unit 151 of the other power supply module 101. The other power supply module 101 is a power supply module 101b when the power supply module 101 shown in FIG. 2 is the power supply module 101a shown in FIG.

The current balance unit 151 of the other power supply module 101 sends a signal S8', which is a signal corresponding to the signal S8 transmitted by the power supply module 101, to the current balance unit 151.

Current balance unit 151, the current value _{I out} and the signal S8 'of the output current from other power modules 101 that represents the current value _{I out'} a signal representing the difference is signal S9 the voltage control unit 103 with the signal S7 represents Send to. The signal S9 also includes information indicating which of the current value I _out and the current value I _{out'is larger.} The current balance unit 151 generates the signal S9 from the _{current value I out} and the current value I _out' , for example, in a configuration including a differential amplifier.

When the difference between the current value I _out and the current value I _{out'exceeds the} set value, the voltage control unit 103 performs the following operation. _{When the difference between the current value I out} and the current value I _out'is equal to or less than the set value, the voltage control unit 103 stops the next operation.

That is, the voltage control unit 103 generates a signal S10 which is a control signal for adjusting the voltage V _m which is the output voltage to the voltage adjustment unit 106 by signal S9 which is sent from the current balance unit 151. Signal S10 decreases the voltage V _m when the current value I _out exceeds the current value I _{out ',} in the opposite case is of the content to increase the voltage V _m.

When the voltage control unit 103 sends the signal S10 to the voltage adjustment unit 106, the voltage control unit 103 stops sending the signal S1 to the voltage adjustment unit 106.

The voltage control unit 103, to generate the control signal to approximate the current value I _out to the current value I _{out ',} it is possible to use a general method of generating a control signal closer to a certain value measurements.

The situation in which the voltage control unit 103 sends the signal S10 to the voltage adjustment unit 106 _{may occur when the current value I out} , which is the output current, is large to some extent. The reason is that the _{situation where the difference between the current value I out} and the current value I _out'is greater than or equal to the set value can occur when each current value is large to some extent. As a case where each current value is large to some extent, for example, when the load 201 includes a fan and a semiconductor, it can be assumed that the fan is operating.

The current detection unit 146 may be inserted at another position after the voltage adjustment unit 106. Further, the current detection unit 146 may be inserted inside the voltage adjustment unit 106. Further, the current detection unit 146 may be inserted in front of the voltage adjustment unit 106. In that case, it may be one which measures the current of the voltage V _in the alternating current of the AC-DC converter is a voltage adjusting unit 106.

However, as depicted in FIG. 8, is better to the current detection unit 146 is inserted at a position closer on the current path to the load 201, the current value _{I out} of the current value _{I out} and other power module 101 of the power module 101 It is considered that the control to bring the currents closer to each other can be performed more accurately. When the current detection unit 146 is far from the load 201 on the current path, the _{current value I out} is controlled by the current value deviating from the _{current value I out actually output to the load 201.} Therefore, the variation in the degree of the deviation between the power supply modules can be a factor of control error.
[effect]
The power supply module of the second embodiment has the same configuration as the power supply module of the first embodiment, and has the same effect.

The power supply module of the second embodiment is a voltage adjusting unit that brings the output current value of the other power supply module closer to its own output current value when the output current value of the other power supply module deviates from its own output current value. Control the output voltage. Therefore, all the current modules connected in parallel can bring the current supplied to the load close to the maximum value allowed for the power supply module. As a result, the power supply of the second embodiment may supply more current to the load.

As the power supply module of the embodiment, it can be assumed that the output voltage from the voltage adjusting unit is negative. In that case, the direction of connection to the subsequent stage of the voltage adjusting portion of the oring element is opposite. Then, when the FET of the oring element is turned off, the voltage control unit sends a control signal to be added to the absolute value of the output voltage to the voltage adjustment unit. The voltage adjusting unit adds to the absolute value of the output voltage by the control signal.

When the output voltage is positive, the addition of the absolute value of the output voltage is the same as the addition of the output voltage.

FIG. 9 is a block diagram showing the configuration of the control device 101x, which is the minimum configuration of the control device of the embodiment.

The control device 101x includes a sending unit 131x and a control unit 103x.

The transmission unit 131x transmits first or second information when switching between insulation and conduction between the source and drain of the field effect transistor in the parallel connection circuit of the field effect transistor and the diode, respectively. The parallel connection circuit is connected in series to the rear stage of the voltage adjusting unit in the direction of the current flowing through the rear stage.

The control unit 103x controls the output voltage including the addition of the absolute value of the output voltage of the voltage adjusting unit based on the first information and the cancellation of the addition based on the second information.

When the source-drain of the field-effect transistor is isolated, the main current path of the output current from the voltage regulator is switched from the source-drain to the diode. The resistance of the diode in the orientation is greater than the resistance in the orientation between the source and drain. Therefore, when the source and drain are insulated, the voltage drop of the absolute value of the output voltage from the parallel connection circuit increases.

The control device 101x adds the absolute value of the output voltage of the voltage adjusting unit to the period during which the absolute value of the voltage decrease is increasing. Therefore, the control device 101x can reduce or eliminate the voltage drop of the absolute value of the output voltage from the parallel connection circuit.

Therefore, the control device 101x can further suppress the trouble that occurs in the load due to the decrease in output.

The control device 101x shown in FIG. 9 is, for example, a combination of the FET control unit 131 and the voltage control unit 103 shown in FIGS. 5 and 8.

Further, the sending unit 131x is, for example, the FET control unit 131 shown in FIGS. 5 and 8.

Further, the control unit 103x is, for example, the voltage control unit 103 shown in FIGS. 5 and 8.

Further, the voltage adjusting unit is, for example, the voltage adjusting unit 106 shown in FIGS. 5 and 8.

Further, the field effect transistor is, for example, the FET 116 shown in FIGS. 5 and 8.

Further, the diode is, for example, the diode 121 shown in FIGS. 5 and 8.

Further, the parallel connection circuit is, for example, the oring element 120 shown in FIGS. 5 and 8.

Further, the addition is, for example, the voltage Vf shown in FIG. 7.

Although each embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and further modifications, substitutions, and adjustments can be made without departing from the basic technical idea of the present invention. Can be added. For example, the composition of the elements shown in each drawing is an example for facilitating the understanding of the present invention, and is not limited to the composition shown in these drawings.

Further, a part or all of the above-described embodiment may be described as in the following appendix, but is not limited to the following.
(Appendix 1)
When switching between the insulation and conduction between the source and drain of the field effect transistor of the parallel connection circuit of the field effect transistor and diode connected in series in the direction of the current flowing in the subsequent stage to the rear stage of the voltage adjusting unit, A sending section that sends the first or second information, respectively,
A voltage control device including a control unit that controls the output voltage including addition of an absolute value of the output voltage of the voltage adjusting unit based on the first information and cancellation of the addition based on the second information.
(Appendix 2)
The voltage according to Appendix 1, wherein the control unit includes a switching unit that switches a reference voltage for the output voltage used for the control related to each of the addition and the release based on the first and second information. Control device.
(Appendix 3)
The voltage control device according to Appendix 2, wherein the switching unit includes a plurality of voltage sources having different output voltages, and performs the switching by selecting the voltage source to be output.
(Appendix 4)
The voltage control device according to Appendix 2 or Appendix 3, wherein the switching unit includes a switch for performing the switching.
(Appendix 5)
The voltage control device according to Appendix 4, wherein the switch is a second field effect transistor.
(Appendix 6)
The voltage control device according to Appendix 5, further comprising a plurality of the second field effect transistors.
(Appendix 7)
In any one of Supplementary note 2 to Supplementary note 6, further comprising a differential circuit that outputs a voltage representing the difference between the output voltage and the reference voltage, and a control circuit that performs the control by the voltage representing the difference. Described voltage controller.
(Appendix 8)
The first information is one of a first signal which is a signal for performing the insulation and a second signal which is a signal for performing the conduction, and the second information is the first signal and the said. The voltage control device according to any one of Supplementary note 1 to Supplementary note 7, which is the other of the second signals.
(Appendix 9)
The current value of the first position provided in the first power supply device and which is a predetermined position of the current path between the input terminal of the first power supply device and the output terminal of the first power supply device for the control. The first current value is close to the second current value which is the current value of the second position corresponding to the position of the second power supply device. The voltage control device described in the above.
(Appendix 10)
The voltage control device according to Appendix 9, wherein the position is after the parallel connection circuit in the current path.
(Appendix 11)
A power supply device including the voltage control device according to any one of Supplementary Note 1 to Supplementary Note 10 and the voltage adjusting unit.
(Appendix 12)
The power supply device according to Appendix 11, further comprising the parallel connection circuit.
(Appendix 13)
A power supply in which a plurality of power supply devices according to Appendix 11 or 12 are connected in parallel.
(Appendix 14)
When switching between the insulation and conduction between the source and drain of the field-effect transistor of the parallel connection circuit of the field-effect transistor and diode connected in series in the forward direction of the current after the voltage regulator, respectively, the first Send the first or second information,
The output voltage is controlled including the addition of the output voltage of the voltage adjusting unit based on the first information and the cancellation of the addition based on the second information.
Voltage control method.

100 Power supply 101, 101a, 101b Power supply module 101x Control device 102 Control circuit 103 Voltage control unit 103x Control unit 104 Differential amplifier 105 Selection unit 106 Voltage adjustment unit 111 Voltage detection unit 116 FET
120 Oring element 121 Diode 131 FET Control unit 131x Feed unit 146 Current detection unit 151 Current balance unit 201 Load 301, 302 FET
306 Negative element 311, 312 Power supply

Claims (7)

Insulation and conduction between the source and drain of the first field-effect transistor of the parallel connection circuit of the first field-effect transistor and diode connected in series in the direction of the current flowing in the latter stage to the rear stage of the voltage regulator. When switching between, and the sending section that sends the first or second information, respectively,
It is provided with a control unit that controls the output voltage including the addition of the absolute value of the output voltage of the voltage adjusting unit based on the first information and the cancellation of the addition based on the second information.
The control unit includes a switching unit that switches a reference voltage for the output voltage used for the control related to the addition and the release, respectively, based on the first and second information.
The switching unit includes a plurality of voltage sources having different output voltages, and by selecting the voltage source to be output, the switching is performed.
The control unit includes a differential circuit that outputs a voltage representing the difference between the output voltage and the reference voltage, and a control circuit that performs the control by the voltage representing the difference.
The output voltage is input to one input terminal of the differential circuit, and the input of the first reference voltage to the other input terminal of the differential circuit is switched by the second field effect transistor, and the other The input of the second reference voltage to the input terminal of is switched by the third field effect transistor, and is between the source and drain of one of the second field effect transistor and the third field effect transistor. Switching between insulation and conduction is performed based on the first and second information, and switching between insulation and conduction between the source and drain of the second field effect transistor and the other of the third field effect transistor is performed. Is performed by the first and second information input via the negative circuit.
Voltage controller. The first information is one of a first signal which is a signal for performing the insulation and a second signal which is a signal for performing the conduction, and the second information is the first signal and the said. The voltage control device according to claim 1 , which is the other of the second signals. The current value of the first position provided in the first power supply device and which is a predetermined position of the current path between the input terminal of the first power supply device and the output terminal of the first power supply device for the control. The first current value is the one according to claim 1 or 2 , wherein the first current value is close to the second current value which is the current value of the second position corresponding to the position of the second power supply device. Voltage control device. The voltage control device according to claim 3 , wherein the position is after the parallel connection circuit in the current path. A power supply device including the voltage control device according to any one of claims 1 to 4 and the voltage adjusting unit. A power supply in which a plurality of power supply devices according to claim 5 are connected in parallel. When switching between the insulation and conduction between the source and drain of the field effect transistor of the parallel connection circuit of the field effect transistor and diode connected in series in the direction of the current flowing in the subsequent stage to the rear stage of the voltage adjusting unit, Send the first or second information, respectively,
There line control of the output voltage includes a release of the plus plus the absolute value by the second information of the output voltage of the voltage regulator according to the first information,
The output voltage control is performed by switching the reference voltage for the output voltage used for the control related to the addition and the cancellation, respectively, based on the first and second information.
The switching of the reference voltage is performed by selecting the voltage source to be output from a plurality of voltage sources having different output voltages.
The control of the output voltage is
The output voltage is input to one input terminal of a differential circuit that outputs a voltage representing the difference between the output voltage and the reference voltage, and the first reference voltage to the other input terminal of the differential circuit The input is switched by the second field-effect transistor, and the input of the second reference voltage to the other input terminal is switched by the third field-effect transistor, the second field-effect transistor and the third. Switching between insulation and conduction between the source and drain of one of the field-effect transistors of the above is performed by the first and second information, and of the second field-effect transistor and the third field-effect transistor. When the switching between the insulation and the continuity between the other source and drain is performed by the first and second information input via the negative circuit, the output from the differential circuit is used.
Voltage control method.

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