JP2008141839A - Simultaneous power supply starting system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem that, in a plurality of power supply systems using conventional loop circuits, when even one fault occurs in a power supply module, the loop circuit is brought into an "opened state", and as a result, a power supply cannot start power feeding to a load, or may stop the power feeding. <P>SOLUTION: In order to solve the problem, there is provided a multiple-power simultaneous power supply starting system which comprises: a plurality of power supplies: a plurality of switches for starting power feeding to the loads; a standby number detection part for detecting the number of the power supplies in standby states which are power feedable states; and a command part which outputs an on-command being a command for turning on the switch according to the detection result. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a control circuit for simultaneously starting up the power supply modules in a power supply system including a plurality of power supply modules.

  Currently, power supplies for communication equipment such as exchanges and broadcasting equipment are required to be miniaturized in accordance with rack mounting. Power is supplied to a single load using a plurality of small power sources.

  In addition, in order to increase the power consumption of equipment, the power supply capacity of one small power supply often becomes insufficient with respect to the power supply required by the load side. Therefore, if power is supplied by a single power source, the power source bears a load exceeding the rated value, causing an overload failure and stopping the power source. For this reason, a plurality of power supplies are used in order to be able to supply the power required by the load side. In this case, in order to be able to supply the power required by the load, a certain number of power supplies is required. Therefore, a plurality of power supplies are started in order, and power supply is performed when a certain number of power supplies is reached. Need to start. Therefore, in the prior art, if the number of power supplies that can supply the power required by the load side is N, when the number of activated power supplies is less than N, the power supply is not performed and the standby state is established. A system is used in which power is supplied simultaneously from a power supply in a standby state when power can be supplied and power required by the load side can be supplied.

Here, FIG. 15 shows an example of a control system for simultaneously starting up a plurality of power supply modules of the prior art. The control circuit for simultaneously starting a plurality of power supply modules takes loop contact information of switches (1501, 1502, 1503) in each of the N power supply modules in a loop circuit as shown in FIG. In this system, power is supplied from all the power supply modules to the load side when the power supply modules are started up (only when all the power supply modules in the figure are started and the loop circuit is closed).
JP-A-1-243823

  However, here, in the conventional simultaneous power supply startup system as shown in FIG. 15, if even one power supply module fails, the loop circuit becomes “open” and the power supply supplies power to the load. Cannot start or power supply is stopped. Moreover, since all the power supply modules are stopped, it is impossible to determine which power supply has failed. Furthermore, when replacing a power supply module for periodic power supply maintenance or the like, the apparatus itself is stopped only by stopping one power supply module, and cannot be adopted in an exchange or the like in which the apparatus cannot be stopped.

  Therefore, in order to solve the above problems, in the present invention, a plurality of power supply units, a plurality of switches for starting supply of power from each power supply unit to the load, and a standby state in which power can be supplied A multiple power supply simultaneous supply start system comprising: a standby number detection unit that detects the number of power supply units in the system; and a command unit that outputs an ON command that is a command to simultaneously turn on the plurality of switches according to a detection result. provide. In addition, the same number of switches and command units as the number of power supply units are provided, and the power supply unit, the switch unit, and the command unit are all stored in the module housing, and the standby number detection unit is provided on the board. Provided is a multiple power supply system that is provided integrally. In addition, the standby number detection unit includes a standby number detection resistor for obtaining a first voltage by a current obtained according to the number of standbys of the power supply unit, and a first value to be compared with the first voltage by a comparator which is a command unit. Provided is a simultaneous multiple power supply system comprising a comparison resistor for generating two voltages. The standby number detection unit compares one standby number detection resistor for obtaining a first voltage with a current obtained according to the number of standbys of the power supply unit, and the first voltage by a comparator which is a command unit. Provided is a multiple power supply simultaneous supply system including a comparison resistor that generates a second voltage corresponding to each power supply unit. In addition, the plurality of comparison resistance values corresponding to each power supply unit are all the same value, and a plurality of power supplies in which each switch is turned on when the number of standbys of the power supply unit becomes a predetermined relationship compared to the first voltage. Provide a simultaneous supply system. The standby number detection unit includes a standby number detection voltage adder that is a standby number detection unit for obtaining a third voltage that is a sum of voltages obtained according to the standby of the power supply unit, and a comparator that is a command unit. Provided is a multiple power supply simultaneous supply system comprising a comparison resistor for generating a fourth voltage to be compared with the third voltage. Further, the plurality of comparison resistance values corresponding to each power supply unit are all the same value, and each switch is turned on when the number of standbys of the power supply unit has a predetermined relationship compared with the third voltage. 6. A simultaneous power supply system for a plurality of power sources according to item 6.

  According to the present invention having the above-described configuration, it is possible to perform simultaneous activation by majority decision according to the standby number of the power supply unit, instead of the AND condition of the loop contact information as described in the prior art. Further, even if a failure occurs in some of the power supply units (power supply modules), another power supply unit can supply power to the apparatus load. In addition, the power supply module can be replaced during the operation of the apparatus.

  Hereinafter, embodiments of each invention will be described. Note that the present invention is not limited to these embodiments, and can be implemented in various modes without departing from the spirit of the present invention.

  In addition, the relationship between the following embodiment and a claim is as follows. In the first embodiment, claims 1 and 2 will be mainly described. In the second embodiment, claim 3 will be mainly described. In the third embodiment, claims 4 and 5 will be described. In the fourth embodiment, claims 6 and 7 will be mainly described.

<< Embodiment 1 >>
<Outline of Embodiment 1>
In the present embodiment, as shown in FIG. 1, the apparatus power supply (0100) has a plurality of power supply modules (0101, 0102, 0103) and supplies power to the apparatus load (0190). This is a system in which the apparatus power supply starts supplying power to the load based on the result of the detection unit (0120) that detects that the supply is possible (standby state). In order to avoid confusion, only three power supply modules are shown in the figure, but the number of power supply modules is an arbitrary integer of two or more.

<Configuration of Embodiment 1>
The present embodiment relates to a multiple power supply simultaneous supply start system including a plurality of power supply units, a plurality of switches, a standby number detection unit, and a command unit.

  FIG. 2 shows an example of a block diagram in the present embodiment. The multiple power supply simultaneous supply start system of the present embodiment includes a plurality of “power supply units” (0201, 0202, 0203), a plurality of “switches” (0211, 0212, 0213), and a “standby number detection unit” (0220). And an “instruction part” (0230).

  The “power supply unit” (0201, 0202, 0203) is configured to supply power to the apparatus load as described above. For example, a DC-DC converter or an AC-DC converter may be used. Here, each power supply unit is configured to output a signal indicating that it has entered a standby state to a standby number detection unit (to be described later) when it enters a standby state (a state in which power can be supplied to the load). May be. Here, in the multiple power supply simultaneous supply start system of this embodiment, a plurality of power supply units (N units) are used, but in order to avoid confusion on the drawing, the power supply unit 1 (0201) and the power supply unit 2 are shown in the figure. (0202), only the power supply unit N (0203) is described. This means that there are not only three power supply units, but there are N power supply units, and this will be described just in case (hereinafter, the same applies to switches and the like). . Also, here, assuming that the number of power supply units necessary to supply the power that can be operated by the load is M, N = M + 1 units or N = M + X units (X is an arbitrary positive integer) can be prepared. It is possible to make the power supply redundant.

  The “switch” (0211, 0212, 0213) is configured to start supplying power from each power supply unit to the load. Here, ON / OFF of the switch is determined by an instruction of an instruction part to be described later. FIG. 3 shows a specific example of the configuration of connection between the switch and the power supply unit (configuration of only one power supply unit). However, here, it is assumed that the power supply unit (0301) (here, a DC-DC converter) used in this example has a remote control terminal (0341), and a switch (0311) is connected to the remote control terminal. . When a voltage of “Low” level (for example, about 0 V to 1.0 V) is applied to the remote control terminal, the output voltage of the DC-DC converter is output to the load (0390). On the other hand, when a “High” level voltage (for example, about 3.5 V to 7.0 V) is applied, the output voltage to the load is turned off. Therefore, as shown in the figure, a switch (here, FET) is connected to the remote control terminal of the DC-DC converter, and a power supply terminal Vcc is connected to the drain of the FET. Further, an instruction unit (0330) described later is connected to the gate of the FET. In this case, when the switch is turned on, it means that a high level voltage signal for turning on the FET is applied to the gate from the command section, and a ground level “Low” level voltage is applied to the remote control terminal. The DC-DC converter outputs the output voltage to the load.

  The “standby number detection unit” (0203) is configured to detect the number of power supply units in a standby state in which power can be supplied. Here, the standby number detection unit may be configured by a control circuit or the like that receives a signal output when each of the power supply units described above is in a standby state and determines the standby number based on the signal. In addition, when it is determined that the number of standby units of the power supply unit has reached a predetermined number, a signal that causes the command unit to output an ON command may be output to the command unit described later.

  The “command section” (0230) is configured to output an ON command that is a command to turn on the plurality of switches simultaneously according to the detection result. Here, the command unit may be configured by a control circuit that receives a signal output from the above-described standby number detection unit and outputs a signal that turns on each of the above-described switches based on the signal. Also, as shown in FIG. 4, the command unit (0430) includes N command units corresponding to the plurality of N power supply units (0401, 0402, 0403) and switches (0411, 0412, 0413). 1 (0431), command part 2 (0432)... Command part N (0433). This is the end of the description of each component.

  Next, as shown in FIG. 5, in the simultaneous multiple power supply start system of the present invention, switches and command units are provided in the same number as the number of power supply units, and power supply units (0501, 0502, 0503) and switches (0511). , 0512, 0513) and the command section (0531, 0532, 0533) are accommodated in the module housing, and the standby number detection section (0520) is integrally provided on the board. It may be configured. As a result, the modules connected to the power supply units (power supply module 1 (0551), power supply module 2 (0552),... Power supply module N (0553)) and the wiring connected to the standby detection unit (0520) are connected. Each module can be wired and can have a simple configuration. In addition, since each power supply module and the standby number detection unit board are configured separately, if a failure such as a failure occurs, the failure can be recovered by replacing only the failed power supply module and replaced to the standby detection unit There is no need to do. In addition, when a power supply module more than the power required by the load, such as M + 1 units, is incorporated and made redundant, the power supply to the load does not stop even if the faulty module is removed, so that it is always driven. Effective for necessary equipment. Here, the switch and the command unit may be provided on the standby detection unit board instead of being housed in the power supply module housing. This is because when the switch and the command section are composed of highly reliable electronic components, it is considered that it is not necessary to house them on the power supply module side particularly for the purpose of replacement.

<Effect of Embodiment 1>
As described above, the multiple power supply simultaneous supply start system according to the present embodiment does not start the simultaneous supply of power to the load under the AND condition of the loop contact information as described in the prior art, but by the majority decision according to the number of standbys of the power supply module. Can be activated simultaneously. Further, even if a failure occurs in some power supply modules, power can be supplied to the device load, and the failed power supply module can be replaced or maintained without stopping the operation of the device. In addition, by storing switches and command units on the power module housing side and configuring the power module separately from the standby number detection unit, if a failure occurs in the power module, only the power module is replaced and the standby number detection unit There is no need to replace a faulty power supply module connected to it.

<< Embodiment 2 >>
<Outline of Embodiment 2>
In this embodiment, a comparator is used for the command unit used in the first embodiment, and a standby number detection resistor and a threshold voltage are generated in a standby number detection unit for generating a voltage input to the comparator. A resistor is used.

<Configuration of Embodiment 2>
The present embodiment relates to a simultaneous multiple power supply start system in which a standby number detection unit includes a standby number detection resistor and a comparison resistor.

  FIG. 6 shows an example of a circuit configuration in this embodiment. In the multiple power supply simultaneous supply start system of the present embodiment, the standby number detection unit (0620) includes a standby number detection resistor (0621) and a comparison resistor (0622). Further, the command part is composed of comparators (0631, 0632, 0633).

  The “standby number detection resistor” (0621) is configured to obtain the first voltage by a current obtained according to the number of standbys of the power supply unit. Here, as shown in FIG. 6, as a configuration for generating the first voltage Vn in the standby number detection resistor, when the power supply unit enters a standby state where power can be supplied, the current source included in the power supply unit A predetermined current may be supplied. In this case, a stepped voltage appears at the node A as shown in FIG. Here, a description will be given below of the generation of a stepped voltage at the node A. In a region 0701 of FIG. 7, the power supply unit is not in a standby state, and the current from the current source is not output to the standby number detection resistor, so that a predetermined voltage is not generated at the node A. Next, in a region 0702, when one power supply unit is in a standby state, the current from one current source is output to the standby number detection resistor, and the voltage V1 is generated at the node A. Next, in a region 0703, when one power supply unit is in a standby state, currents from two current sources are output to the standby number detection resistor, and a voltage V2 is generated at the node A. Thereafter, as each power supply unit enters a standby state, the first voltage Vn increases stepwise.

  The “command part” is composed of comparators (0631, 0632, 0633). Here, the comparator is a voltage comparator, which compares two input voltages and converts the output into a binary value of high level and low level depending on the magnitude. As an example of the comparator, a circuit configuration using an open loop operational amplifier (0831) as shown in FIG. Usually, an operational amplifier is used to amplify a difference between two input voltages (here, Vn and Vth). However, because the amplification is very large, it is usually used with negative feedback, but when used as a comparator, it is used in an open loop without negative feedback. Therefore, in order to amplify a slight difference in the input voltage, if there is any difference in the input voltage, the output voltage will be saturated positively or negatively (0 V in this example), as shown in FIG. The graph is as shown. For example, as shown in the figure, when the input voltage Vth of the non-inverting terminal is used as a reference, when the input voltage Vn of the inverting terminal is equal to or lower than the voltage Vth, the voltage output is the voltage V3, and the input voltage Vn of the inverting terminal is non-inverting terminal. When the input voltage is Vth or higher, a voltage output near 0 V is obtained. However, the voltage output here is not the voltage amplified according to the amplification factor of the operational amplifier, but is saturated in the vicinity of the power supply voltage Vcc applied to the operational amplifier, and thus has an output pattern as shown in the figure.

  The “comparison resistor” (0622) is configured to generate a second voltage to be compared with the first voltage by a comparator serving as an instruction unit. Here, for example, as shown in FIG. 6, there is a method of applying the power supply voltage Vcc to the comparison resistor as a configuration for generating the second voltage in the comparison resistor. In this case, the comparison resistor may be configured to include two resistors (0622, 0623) for dividing the voltage from the power source in order to input the predetermined voltage Vth to the comparator.

  FIG. 9 shows an example of the relationship between the first voltage Vn and the second voltage Vth generated by the standby number detection resistor and the comparison resistor in the circuit configuration of FIG. First, when the power supply unit enters a standby state in which power can be supplied, a predetermined current is supplied from a current source according to the number of standbys. Then, the step-like first voltage Vn appears at the node A, and the first voltage Vn is input to the comparator. Here, the second voltage Vth, which is the voltage of the node B generated by the comparison resistor, is input to the other input terminal of the comparator.

  Here, each power supply unit is activated to sequentially enter a standby state. First, in the state 0901, there is no standby state in which the power supply unit can supply power, no current flows from the current source to the standby number detection resistor, and no voltage is generated at the node A. For this reason, the comparator does not output an ON command for turning on the switch as described in the first embodiment. Next, in a state 0902, a power supply unit is in a standby state where power can be supplied, current flows from the current source to the standby number detection resistor, and a voltage V4 is generated at the node A. Therefore, the voltage V4 is input to the comparator. However, since it is lower than the second voltage Vth that is the reference voltage input to the other terminal of the comparator, the comparator does not output an ON command for turning on the switch, as in the state 0901. Next, in the state 0903, the two power supply units are in the standby state, the current flows from the current sources for the two units to the standby number detection resistor, and the voltage V5 is generated at the node A. Since this voltage is higher than the second voltage Vth, which is the reference voltage input to the other terminal of the comparator, the comparator outputs an ON command for turning on the switch. Therefore, at this time, all the power supply units in the standby state are activated, and power can be supplied to the load. As described above, by adjusting the relationship between the first voltage and the second voltage, it is possible to simultaneously activate a plurality of power supply units that supply power necessary for the load. In addition, in the case where the power supply is made redundant, another power supply unit may be subsequently activated to be in the state 0904. At this time, the voltage appearing at the node A becomes V6, and the output of the comparator outputs an ON command for turning on the switch as in the state 0903.

  The case where the power required by the load requires power supply from two or more power supply units has been described above. Furthermore, when the power required by the load needs to be supplied from three or more power supply units, the relationship between the first voltage Vn and the second voltage Vth input to the comparator as the command unit may be changed. For example, as shown in FIG. 10, if the value of the comparison resistor that generates the second voltage Vth is changed and Vth is set between V5 and V6, the power supplies can be started simultaneously in a state where three power supply units are in the standby state. It becomes like this. Further, the step interval Vstep of the staircase can be adjusted by changing the value of the standby number detection resistor. For this reason, by adjusting Vstep without changing the second voltage Vth, the power supplies may be activated simultaneously in a state where the three power supply units are in the standby state. Hereinafter, when four power supply units are required, the respective resistance values may be similarly changed.

<Effect of Embodiment 2>
As described above, the multiple power supply simultaneous supply start system according to the present embodiment does not start the simultaneous supply of power to the load under the AND condition of the loop contact information as described in the prior art, but by the majority decision according to the number of standbys of the power supply module. Can be activated simultaneously. Further, the standby number detection unit can be configured to have a relatively simple circuit configuration of a power source (power supply terminal), a standby number detection resistor, and a comparison resistor.

<< Embodiment 3 >>
<Outline of Embodiment 3>
The present embodiment is based on the second embodiment, and is characterized in that the number of comparison resistors of the standby number detection unit is the same as the number of power supply units.

<Configuration of Embodiment 3>
In this embodiment, the standby number detection unit uses a standby number detection resistor for obtaining a first voltage from a current obtained according to the number of standbys of the power supply unit, and a comparator serving as an instruction unit. And a comparison resistor for generating a second voltage corresponding to each power supply unit to be compared. Here, the “standby number detection resistor”, “command unit”, and “comparison resistor” have already been described in the second embodiment, and thus the description thereof is omitted in this embodiment.

  FIG. 11 shows an example of a circuit configuration in the present embodiment. Basically, the configuration is similar to that of FIG. 6 described in the second embodiment, except that the comparison resistors (1124, 1125, 1126) correspond to the respective power supply units, and the same number is prepared. Here, the second voltage generated at the node C, the node D, and the node E is supplied with a predetermined current from a current source (1171, 1172, 1173) included in the power supply unit when the power supply unit is in a standby state. It may be configured as follows. In addition, as shown in FIG. 12, a power supply that outputs a predetermined voltage is connected to each comparison resistor, and the second voltage is generated at the node F, the node G, and the node H by dividing the voltage by the two resistors. Good. Further, the comparison resistor may be mounted on the power supply module side.

  Further, the plurality of comparison resistance values corresponding to each power supply unit are all the same value (or substantially the same value), and when the number of standbys of the power supply unit becomes a predetermined relationship compared to the first voltage Vn, The switch may be configured to be turned on. Therefore, as a result, the voltages Vn and Vth input to the comparator are the same graphs as in FIG. 9, and, as described in the second embodiment, depending on the relationship between the standby number detection resistor and the voltage generated from the comparison resistor. It is possible to simultaneously start a plurality of power supply units and supply power necessary for a load. In this case, all the electronic components configured in the standby number detection unit are passive electronic components, and the circuit configuration is simplified.

  Here, as described in the first embodiment, the power supply unit, the command unit, and the switch are all stored in the power supply module side, and the standby number detection unit is integrally provided on the board. Think. In this case, since the standby number detection resistor and the comparison resistor provided integrally on the board of the standby number detection unit are passive electronic components, the standby number detection unit is unlikely to fail. Therefore, it is very rare to replace the standby number detection unit board due to a failure or the like. This can be said that there is a higher possibility of a failure occurring on the power supply module side in which the active electronic component is housed than on the board side of the standby number detection unit configured only by resistors. Therefore, the reliability of the system can be improved by making it possible to replace power supply modules that are relatively susceptible to failure by separating the board of the standby number detection unit that is less likely to fail and the power supply module side. Furthermore, at this time, since each power supply module has no individuality when viewed from the standby number detection unit side, there is no problem even if any power supply module enters the standby state. In the case of a redundant power supply, a failure occurs in a certain power supply module, and even if the power supply module is removed, the power supply to the load does not change. Therefore, it is possible to insert / remove the power supply module without stopping the operation of the apparatus.

<Effect of Embodiment 3>
As described above, the multiple power supply simultaneous supply start system in this embodiment does not start the simultaneous supply of power to the load under the AND condition of the loop contact information as described in the prior art, but by majority decision according to the number of standbys of the power supply module. Can be activated simultaneously. Further, compared to the configuration of the second embodiment, the standby number detection unit does not require a power source, and the circuit configuration can be configured with all passive components such as resistors, and a simple circuit configuration can be achieved. In addition, since the configuration of only passive components is less likely to fail, reliability can be improved. In addition to the above effects, if the values of the comparison resistors are all the same, in the case of a failure in a certain power supply module in a redundant power supply, the device can be operated even if the power supply module is removed. It is possible to insert and remove the power supply module without stopping.

<< Embodiment 4 >>
<Outline of Embodiment 4>
In the present embodiment, a voltage source is used instead of the current source of the power supply unit used in the third embodiment.

<Configuration of Embodiment 4>
The present embodiment relates to a multiple power supply simultaneous supply start system in which a standby number detection unit includes a standby number detection voltage adder and a comparison resistor.

  FIG. 13 shows an example of a circuit configuration in this embodiment. In the multiple power supply simultaneous supply start system of the present embodiment, the standby number detection unit (1320) includes a standby number detection voltage adder (1381) and comparison resistors (1382, 1383, 1384). However, “comparator” has already been described in the second embodiment, and a description thereof will be omitted in this embodiment.

  The “standby number detection voltage adder” (1381) is configured to obtain a third voltage that is the sum of the voltages obtained in accordance with the standby of the power supply unit. Here, as shown in FIG. 13, as a configuration for causing the standby number detection voltage adder to generate the third voltage Vn, when the power supply unit is in a standby state in which power can be supplied, the power supply unit performs predetermined processing. May be output. Therefore, with such a configuration, the third voltage Vn is generated at the node I. FIG. 14 shows an example of the circuit configuration of the standby number detection voltage adder. Thus, the sum of the input voltages can be obtained by the voltage adder using the operational amplifier (1401). However, the output voltage of the operational amplifier (1401) is an inverted voltage with respect to the input voltage. Therefore, a voltage having the same phase as the input voltage can be obtained by combining an inverting amplifier using an operational amplifier (1402) in the subsequent stage (however, the resistance values used in the circuit are all the same value).

  The “comparison resistors” (1382, 1383, 1384) are configured to generate a fourth voltage Vth to be compared with the third voltage Vn by a comparator which is an instruction unit. Here, for example, as shown in FIG. 13, the voltage output from the power supply units (1301, 1302, and 1303) to the standby detection unit is divided into a predetermined voltage as a configuration in which the comparison resistor generates the fourth voltage. In order to pressurize, two resistors (1382 and 1385, 1383 and 1386, 1384 and 1387) may be configured. Therefore, a fourth voltage is generated at node J, node K, and node L existing between these two resistors.

  In addition, the plurality of comparison resistance values corresponding to each power supply unit are all the same value, and each switch is turned on when the number of standbys of the power supply unit has a predetermined relationship compared to the third voltage. May be. According to the present embodiment having such a configuration, the relationship between the third voltage Vn and the fourth voltage Vth input to the comparator is a graph similar to that in FIG. 9, and the number of standbys is the same as described in the second embodiment. Depending on the relationship between the voltage generated from the detection voltage adder and the comparison resistor, it is possible to simultaneously start a plurality of power supply units and supply power necessary for the load.

<Effect of Embodiment 4>
As described above, the multiple power supply simultaneous supply start system according to the present embodiment does not start the simultaneous supply of power to the load under the AND condition of the loop contact information as described in the prior art, but by the majority decision according to the number of standbys of the power supply module. Can be activated simultaneously. Moreover, the circuit which comprises the current source used in Embodiment 2 and Embodiment 3 is not required.

An example of a schematic perspective view of a configuration of a simultaneous multiple power supply start system according to Embodiment 1 An example of a block diagram of a simultaneous multiple power supply start system according to the first embodiment Example of switch configuration according to Embodiment 1 Another example of a block diagram of the simultaneous multiple power supply start system in the first embodiment Another example of a block diagram of the simultaneous multiple power supply start system in the first embodiment An example of a block diagram and circuit diagram of the simultaneous multiple power supply start system in the second embodiment An example of the graph showing the voltage which arises in the node A in Embodiment 2 An example of a circuit constituting an instruction unit in the second embodiment An example of a graph representing the relationship between the first voltage and the second voltage in the second embodiment Another example of a graph representing the relationship between the first voltage and the second voltage in the second embodiment An example of a block diagram and a circuit diagram of a system for simultaneously starting a plurality of power supplies according to the third embodiment Another example of a block diagram and circuit diagram of the simultaneous power supply start system for multiple power sources in the mobile phone 3 Example of block diagram and circuit diagram of simultaneous supply start system for plural power sources in embodiment 4 Example of voltage adder circuit according to the fourth embodiment An example of a block diagram of a control system for simultaneously starting up a plurality of power supply modules of the prior art

Explanation of symbols

0201 Power supply unit 1
0202 Power supply unit 2
0203 Power supply N
0211 Switch 1
0212 Switch 2
0213 Switch N
0220 Standby number detection unit 0230 Command unit

Claims (7)

Multiple power supplies,
A plurality of switches for starting the supply of power from each power supply to the load;
A standby number detection unit that detects the number of power supply units in a standby state in which power can be supplied; and
A command unit that outputs an ON command that is a command to simultaneously turn on the plurality of switches according to a detection result;
A simultaneous power supply start system having a plurality of power supplies. There are as many switches and command units as there are power supplies.
The power supply unit, the switch, and the command unit are each stored in a module housing,
The multiple power supply simultaneous supply system according to claim 1, wherein the standby number detection unit is integrally provided on the board.   The standby number detection unit includes a standby number detection resistor for obtaining a first voltage from a current obtained according to the number of standbys of the power supply unit, and a second voltage to be compared with the first voltage by a comparator as a command unit. The multiple power supply simultaneous supply system according to claim 1, further comprising: a comparison resistor that generates   The standby number detection unit has one standby number detection resistor for obtaining the first voltage by the current obtained according to the number of standbys of the power supply unit, and each of the first voltage to be compared with the comparator which is the command unit. The simultaneous multiple power supply system according to claim 1, further comprising a comparison resistor that generates a second voltage corresponding to the power supply unit.   The plurality of comparison resistance values corresponding to each power supply unit are all the same value, and each switch is turned on when the number of standbys of the power supply unit becomes a predetermined relationship compared to the first voltage. Multiple power supply simultaneous supply system of description.   The standby number detection unit includes a standby number detection voltage adder that is a standby number detection unit for obtaining a third voltage that is a sum of voltages obtained according to standby of the power supply unit, and a comparator that is a command unit. The multiple power supply simultaneous supply system according to claim 1, further comprising a comparison resistor that generates a fourth voltage to be compared with the third voltage.   The plurality of comparison resistance values corresponding to each power supply unit are all the same value, and each switch is turned on when the standby number of the power supply unit has a predetermined relationship compared to the third voltage. Multiple power supply simultaneous supply system of description.

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