JP2015132871A - Power supply system and control method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply system having a first power source and a second power source, configured to improve power supply efficiency.SOLUTION: A power supply system includes: a first power source 300 which can be turned on/off from the outside and outputs a first output 210 to a first output end 120; a second power source 500 which outputs a second output 220 lower in power than the first output 210 to a second output end 130; a first switch 600 which allows the first power source 300 to output the first output 210 to the first and second output ends 120, 130 when the first power source 300 is on; a second switch 700 which allows electrical disconnection so that the second power source 500 may not output the second output 220 to the second output end 130 when the first power source 300 is on; and a control section 400 which on/off-controls the second power source 500, the first switch 600, and the second switch 700.

Description

  The present invention relates to a power supply system and a control method thereof.

  There is a power supply system that can obtain two types of outputs from one power supply. For example, a power supply system includes a main power supply and a standby power supply. The main power supply can supply high-voltage power (hereinafter also referred to as a main output). (Hereinafter also referred to as standby output) can be supplied. Since the standby power supply cannot be turned on and off by an external operation, the standby power supply operates in such a power supply system even when the main power supply is operating. For this reason, even when the main power supply is highly efficient, the standby power supply operates, and the loss due to the standby power supply causes the efficiency of power supply in the power supply system to decrease.

  Here, as related technologies existing prior to the present application, there are, for example, the following patent documents.

  Japanese Patent Application Laid-Open No. 2004-228561 discloses a technique for switching a power supply for supplying power using a FET (Field Effect Transistor) in a power supply device including two power supplies.

  Patent Document 2 discloses a power supply apparatus that includes two power supplies and uses the power supplies properly depending on the size of a load during operation.

  Patent Document 3 discloses a technique in which an electric circuit includes a capacitor and a diode in order to stabilize power supply.

  In Patent Document 4, in a computer having a main power supply and an auxiliary power supply, the main power supply is turned on by supplying power to devices other than the CPU (Central Processing Unit) by using the auxiliary power supply in advance. A computer that shortens the time until startup is disclosed.

JP 2013-125505 A JP 2010-220460 A JP 2010-015310 A JP 2005-149225 A

  However, even if the techniques proposed in Patent Documents 1 to 4 are used, improvement in power supply efficiency in a power supply system including a main power supply and a standby power supply is not considered, and the above-described problems are solved. Has not reached.

  Therefore, the main object of the present invention is to provide a power supply system that can improve the efficiency of power supply in a power supply system including two types of power supplies.

  In order to achieve the above object, a power supply system according to the present invention includes the following configuration.

That is, the power supply system according to the present invention is
A first power source that can be switched on and off from the outside and capable of outputting the first output to the first output terminal,
A second power source capable of outputting a second output having lower power than the first output to the second output end;
A first switch that enables the first power source to output the first output to the second output end together with the first output end when the first power source is in an on state;
When the first power source is in the on state, the second power source can disconnect the electrical connection so as not to output the second output to the second output terminal. With the switch,
A control unit that switches the on / off state of the second power source, the first switch, and the second switch is provided.

The control method of the power supply system according to the present invention that achieves the same object is as follows.
A first power source that can be switched on and off from the outside and capable of outputting the first output to the first output terminal, and a second output having a lower power than the first output to the second output terminal A method for controlling a power supply system having a second power supply,
When the first power source is in an ON state, the first power source is switched by the first switch so that the first output is output to the second output end together with the first output end, and The second power source disconnects the electrical connection by the second switch so that the second output is not output to the second output terminal.

  According to the present invention described above, there is an effect that the efficiency of power supply in a power supply system including two types of power supplies can be improved.

It is a block diagram which shows the structure of the power supply system which concerns on the 1st Embodiment of this invention. It is a block diagram which shows the structure of the power supply system which concerns on the 2nd Embodiment of this invention. It is a block diagram which shows the structure of the power supply system which concerns on the 3rd Embodiment of this invention.

  Next, embodiments of the present invention will be described in detail with reference to the drawings.

<First Embodiment>
FIG. 1 is a block diagram showing the configuration of the power supply system according to the first embodiment of the present invention.

  The power supply system according to the present embodiment includes a rectifier circuit 1, a transformer 2, a main power supply 3, an operation control circuit 4, a standby power supply 5, an M_FET 6, and an S_FET 7.

  M_FET 6 and S_FET 7 are FETs (field effect transistors).

  The rectifier circuit 1 converts the input AC11 from AC (alternating current) to DC (direct current). The DC voltage output from the rectifier circuit 1 is applied to the primary side of the transformer 2. As shown in FIG. 1, a main power supply 3 and a standby power supply 5 are connected to the secondary side of the transformer 2. That is, the DC voltage input to the primary side of the transformer 2 is divided according to a predetermined ratio determined according to the specifications of the transformer 2, and the DC voltage divided according to the ratio is converted into the main power supply. 3 and standby power supply 5. The transformer 2 is not limited to the above-described configuration, and may be prepared individually as long as a predetermined voltage can be applied to the two types of power supplies (3, 5).

  The main power supply 3 can output a larger amount of power (main output 21) than the standby power supply 5 from the output stage. Further, the main power supply 3 can control (on / off control) whether or not to output the main output 21 by an interface (not shown) that performs on / off control based on an external operation. On the other hand, the standby output 22 output from the standby power supply 5 is used to operate the interface. Therefore, the standby power supply 5 may be a circuit with low power and low efficiency as compared with at least the main power supply 3.

  In the present embodiment, the rectifier circuit 1, the main power supply 3, and the standby power supply 5 can employ a rectifier circuit having a general configuration at present, and thus a detailed description thereof will be omitted. .

  The operation signal 14 is a signal for the main power supply 3 to notify the operation detection circuit 4 of the operation state (on / off) of the device itself.

  The operation control circuit 4 outputs a standby signal 15 based on the operation signal 14 and controls an on / off operation by the M_FET control signal 16 and the S_FET control signal 17.

  The source and drain of the M_FET 6 are connected to a main output terminal (first output terminal) 12 from which the main output 21 of the main power supply 3 is output, and a standby output terminal from which the standby output 22 of the standby power supply 5 is output. (Second output end) is connected to the line connected to 13. The M_FET 6 controls the flow of current between the main power supply 3 and the standby output terminal 13 in accordance with the M_FET control signal 16 input to the gate of the M_FET 6. That is, the M_FET control signal 16 is a signal that instructs the operation control circuit 4 to change the operation state (ON / OFF) of the M_FET 6 to the M_FET 6.

  The standby output 22 of the standby power supply 5 can be output to the standby output terminal 13 via the S_FET 7. That is, the source and drain of the S_FET 7 are connected between the standby power supply 5 and the standby output terminal 13. The S_FET 7 controls the flow of current between the standby power supply 5 and the standby output terminal 13 in accordance with the S_FET control signal 17 input to the gate of the S_FET 7. That is, the S_FET control signal 17 is a signal that instructs the operation control circuit 4 to change the operation state (ON / OFF) of the S_FET 7 to the S_FET 7.

  The standby signal 15 is a signal for the operation control circuit 4 to instruct the standby power supply 5 to change the operation state (ON / OFF) of the standby power supply 5.

  The standby power supply 5 is in an on state by default, and is turned on / off based on the content indicated by the standby signal 15.

  Hereinafter, the operation of the power supply system according to the present embodiment will be described with reference to FIG.

  First, when the main power supply 3 is not turned on, the standby power supply 5 is operated by the input AC11 in the power supply system shown in FIG. At this time, since the main power supply 3 is stopped, the operation control circuit 4 does not instruct the standby power supply 5 to change to the off state using the standby signal 15. That is, the standby power supply 5 remains on.

  The operation control circuit 4 instructs the M_FET 6 to change to the OFF state using the M_FET control signal 16. In response to this instruction, the M_FET 6 disconnects the electrical connection between the main power supply 3 and the standby output terminal 13.

  Further, the operation control circuit 4 uses the S_FET control signal 17 to instruct the S_FET 7 to change to the ON state. As a result, the output of the standby power supply 5 (standby output 22) can be output from the standby output terminal 13 to the outside.

  When the main power supply 3 is turned on using an external interface, the main power supply 3 notifies the operation control circuit 4 that the power supply is turned on by an operation signal 14. The operation control circuit 4 detects that the main power supply 3 is operating based on the notified operation signal 14. At that time, the operation control circuit 4 instructs the standby power supply 5 to change to the OFF state by the standby signal 15. Further, the operation control circuit 4 instructs the S_FET 7 to change to the OFF state by the S_FET control signal 17. As a result, the S_FET 7 disconnects the electrical connection between the standby power supply 5 and the standby output terminal 13. Further, the operation control circuit 4 instructs the M_FET 6 to change to the ON state by the M_FET control signal 16. As a result, the M_FET 6 electrically connects the main power supply 3 and the standby output terminal 13. As a result, the main output 21 can be output from the standby output terminal 13 to the outside.

  As described above, power loss due to the standby power supply 5 is eliminated by stopping the standby power supply 5 while the main power supply 3 is operating. Since the standby power supply 5 has a smaller current than the main power supply 3, an increase in current in the main power supply 3 caused by outputting the main output 21 of the main power supply 3 from the standby output terminal 13 is small. Therefore, the power efficiency is hardly deteriorated by outputting the main output 21 of the main power supply 3 from the standby output terminal 13. Therefore, the power supply system according to the present embodiment stops the low-efficiency standby power supply 5 when the main power supply 3 is operating. Thereby, according to the power supply system which concerns on this embodiment, the efficiency of the electric power supply in the said whole power supply system can be improved by operating the highly efficient main power supply 3. FIG.

  When the main power supply 3 is turned off using an interface from the outside, the main power supply 3 notifies the operation control circuit 4 that it is turned off by the operation signal 14. The operation control circuit 4 detects that the main power supply 3 is stopped by the notified operation signal 14. At that time, the operation control circuit 4 instructs the standby power supply 5 to be turned on by the standby signal 15. The operation control circuit 4 instructs the M_FET 6 to change to the OFF state by the M_FET control signal 16. As a result, the M_FET 6 disconnects the electrical connection between the main power supply 3 and the standby output terminal 13. Further, the operation control circuit 4 instructs the S_FET 7 to change to the ON state by the S_FET control signal 17. As a result, the S_FET 7 can electrically connect the standby power supply 5 and the standby output terminal 13 to output the standby output 22 of the standby power supply 5 from the standby output terminal 13 to the outside.

  As described above, the first embodiment has an effect of improving the efficiency of power supply in a power supply system having two types of power supplies (main power supply 3 and standby power supply 5). The reason is that the power supply system according to the present embodiment stops the low-efficiency standby power supply 5 while the main power supply 3 is operating, and outputs the output of the high-efficiency main power supply 3 from the standby output terminal 13. This is because power loss in the standby power supply 5 can be prevented.

<Second Embodiment>
Next, a second embodiment based on the power supply system according to the first embodiment described above will be described. In the following description, the characteristic part according to the present embodiment will be mainly described. At this time, the same reference numerals are assigned to the same configurations as those in the first embodiment described above, and the duplicate description is omitted.

  FIG. 2 is a block diagram showing a configuration of a power supply system according to the second embodiment of the present invention.

  The power supply system according to this embodiment has a configuration in which a backflow preventing diode 8, a state holding capacitor 9, and a capacitor 23 are added to the configuration described in the first embodiment. The state holding capacitor 9 can be charged by the main power supply 3 as will be described later.

  The capacitor 23 is a capacitor for preventing pulsating flow that is generally connected to a terminal to which a load (not shown) is connected. For convenience of explanation of the operation of the power supply system according to the present embodiment, the capacitor 23 is connected to the standby output terminal 13. The state holding capacitor 9 and the capacitor 23 are connected in parallel between the ground as shown in FIG.

  The anode side of the diode 8 is connected between the source of the M_FET 6 and the standby output terminal 13. The cathode side of the diode 8 is connected to the standby power supply 5, the drain of the S_FET 7, and one terminal of the state holding capacitor 9.

  When the main power supply 3 is changed to OFF, as described above in the first embodiment, the operation control circuit 4 changes the standby power supply 5 to the ON state, changes the M_FET 6 to the OFF state, and turns on the S_FET 7. Instruct to change to state. As a result, the standby power supply 5 outputs the standby output 22 from the standby output terminal 13 instead of the main power supply 3 that has been output.

  The capacitor 23 is assumed to have a small electrostatic capacity in response to the standby power supply 5 having low power. In this case, if the start-up of the standby power supply 5 is delayed, there is a possibility that the voltage output to the standby output terminal 13 may decrease due to the lack of the capacitance held in the capacitor 23. .

  Therefore, in the present embodiment, by adopting the above-described circuit configuration shown in FIG. 2, even when the standby power supply 5 is in the off state, the M_FET 6 is in the on state when the main power supply 3 is in the on state, and If the S_FET 7 is in an off state, electric charge is stored in the state holding capacitor 9. Therefore, when the power supply output to the standby output terminal 13 is switched from the main power supply 3 to the standby power supply 5, the state holding capacitor 9 stores the accumulated charge until the standby power supply 5 rises. Can be output. As a result, it is possible to prevent the voltage at the standby output terminal 13 from being lowered.

  According to the second embodiment described above, in addition to the effects of the first embodiment, when the standby output 22 of the standby power supply 5 is switched to output from the standby output terminal 13, the standby output terminal 13 is switched to the standby output terminal 13. There is an effect that the output voltage can be prevented from decreasing.

  The reason is that the power supply system according to the present embodiment charges the state holding capacitor 9 when the standby power supply 5 is in an off state, and until the standby power supply 5 starts up when the main power supply 3 is switched to the standby power supply 5. This is because the pulsation of the output voltage at the standby output terminal 13 can be prevented by utilizing the discharge of the state holding capacitor 9.

<Third Embodiment>
Next, a third embodiment common to the power supply systems according to the first and second embodiments described above will be described.

  FIG. 3 is a block diagram showing a configuration of a power supply system according to the third embodiment of the present invention.

  The power supply system shown in FIG. 3 includes a first power supply 300, a control unit 400, a second power supply 500, a first switch 600, and a second switch 700.

  The first power supply 300 can be switched on and off from the outside, and outputs the first output 210 to the first output terminal 120. In addition, the first power supply 300 notifies the control unit 400 of the on / off state of its own device by the power supply notification signal 140.

  The second power supply 500 outputs a second output 220 having lower power than the first output 210 to the second output terminal 130.

  In the first switch 600, when the first power supply 300 is in the ON state, the first power supply 300 outputs the first output 210 to the second output terminal 130 together with the first output terminal 120.

  The second switch 700 disconnects the electrical connection so that the second power supply 500 does not output the second output 220 to the second output end 130 when the first power supply 300 is in the ON state.

  Based on the power notification signal 140, the control unit 400 uses the power control signal 150, the first switch control signal 160, and the second switch control signal 170 to generate the second power source 500 and the first switch 600. And the on / off state of the second switch 700 is switched.

  As described above, the third embodiment has an effect that the power supply efficiency in the power supply system having two types of power supplies (the first power supply 300 and the second power supply 500) can be improved. There is. The reason is that the power supply system according to the present embodiment stops the low-efficiency second power supply 500 while the first power supply 300 is in operation, and outputs the output of the high-efficiency first power supply 300 to the second. This is because power loss in the second power supply 500 can be prevented by outputting from the output terminal 130.

DESCRIPTION OF SYMBOLS 1 Rectification circuit 2 Transformer 3 Main power supply 4 Operation control circuit 5 Standby power supply 6 M_FET
7 S_FET
8 Diode 9 State holding capacitor 11 Input AC
12 Main output terminal 13 Standby output terminal 14 Operation signal 15 Standby signal 16 M_FET control signal 17 S_FET control signal 21 Main output 22 Standby output 23 Capacitor 100 V
120 First output terminal 130 Second output terminal 140 Power notification signal 150 Power control signal 160 First switch control signal 170 Second switch control signal 200 V
300 First power source 400 Control unit 500 Second power source 600 First switch 700 Second switch

Claims (8)

A first power source that can be switched on and off from the outside and capable of outputting the first output to the first output terminal,
A second power source capable of outputting a second output having lower power than the first output to the second output end;
A first switch that enables the first power source to output the first output to the second output end together with the first output end when the first power source is in an on state;
When the first power source is in the on state, the second power source can disconnect the electrical connection so as not to output the second output to the second output terminal. With the switch,
A power supply system comprising: the second power supply; the first switch; and a control unit that switches an on / off state between the second switch and the second switch. The controller is
In response to turning on the first power source, turning on the first switch, turning off the second switch, and turning off the second power source,
The first switch is turned off, the second switch is turned on, and the second power supply is turned on in response to the first power supply being turned off. The power supply system according to 1. A capacitor connected in parallel between the second power source and the second switch;
The capacitor is
When the first switch is on and the second switch is off, it is charged by the first power source,
The first switch is turned off in response to switching of the first power supply from an on state to an off state, and discharging is performed in response to the second switch being turned on. The power supply system according to claim 2. When the first switch is on, a diode for supplying the first output to the capacitor is provided between the first switch and the second output terminal, the second power source, and the capacitor. The power supply system according to any one of claims 1 to 3, further comprising: 5. The power supply system according to claim 1, wherein the first switch and the second switch are field effect transistors. 6. A first power source that can be switched on and off from the outside and capable of outputting the first output to the first output terminal, and a second output having a lower power than the first output to the second output terminal A method for controlling a power supply system having a second power supply,
When the first power source is in an ON state, the first power source is switched by the first switch so that the first output is output to the second output end together with the first output end, and A control method comprising: disconnecting an electrical connection by a second switch so that the second power source does not output the second output to the second output terminal. In response to turning on the first power source, turning on the first switch, turning off the second switch, and turning off the second power source,
The first switch is turned off, the second switch is turned on, and the second power supply is turned on in response to the first power supply being turned off. 6. The control method according to 6. A capacitor connected in parallel between the second power source and the second switch is charged by the first power source when the first switch is on and the second switch is off. The capacitor is discharged by turning off the first switch and turning on the second switch in response to switching of the first power source from an on state to an off state. The control method according to claim 6 or 7.

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