JPH05274061A - Multiplex power supply device - Google Patents

Abstract

PURPOSE:To perform normal hot-line insertion/extraction without using a reverse current preventing diode by pulling in the voltage of an operating common power bus to a replacement power source module to be connected instead of a faulty power source module and preliminarily charging an output voltage smoothing capacitor of the replacement power source module. CONSTITUTION:Plural power source modules 10 and 10 provided with output voltage smoothing capacitors, plug-in connector mechanisms P1, BJ1, and BJ2 which connect plural power source modules in parallel by plug-in connection of these modules, precharging terminals J1 provided in respective power source modules 10 and 10, and a harness 8 which precharges the power source module 10 in the standby state through the precharging terminal J1 are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an N including a replacement power supply module which makes it possible to replace the failed power supply module under operating conditions when the power supply module in operation fails.
The present invention relates to a multiplexed power supply device composed of +1 power supply module.

[0002]

2. Description of the Related Art In a multiplex power supply device in which a plurality of power supply modules are connected in parallel, a backflow prevention diode is conventionally used in an output circuit in each power supply module for replacement (hot plugging / unplugging) of the power supply module in an operating state. It was realized by providing.

An example of this equivalent circuit is shown in FIG. In FIG. 12, PM is a power supply module, Dz is a backflow prevention diode interposed in the power supply voltage output circuit of the power supply module PM, Cz is an output smoothing capacitor provided in the power supply voltage output circuit, and Pz is each power supply module PM. Is a common power bus.

However, in a low-voltage and high-current power supply module such as 5V, 3.3V, 2V,
The loss in the above-mentioned backflow prevention diode is large, and therefore a mechanism for heat treatment is required, which hinders miniaturization of the module.

In order to eliminate the above-mentioned problems, when the backflow prevention diode is removed, the defective power supply module is removed,
When the normal power supply module is connected via the plug-in connector, the output voltage during operation (common power supply bus voltage) is short-circuited by the output smoothing capacitor of the normal power supply module, which causes the bus voltage to drop sharply and significantly. Then, a problem such as an error occurring in the load during operation occurs.

[0006]

As described above, in the multiplex power supply device according to the conventional structure, when the faulty power supply module is removed and the normal power supply modules are connected in parallel via the plug-in connector. In order to avoid the inconvenience that the output voltage during operation (common power supply bus voltage) is short-circuited by the output smoothing capacitor of the normal power supply module and the bus voltage drops sharply and significantly with it, the output circuit in each power supply module is Since the backflow prevention diode is inserted, therefore, each power supply module needs a heat generation processing mechanism of the backflow prevention diode, which causes a problem that miniaturization of the module is hindered.

The present invention has been made in view of the above situation,
An object of the present invention is to provide a multiplex power supply device capable of hot-line maintenance of each power supply module that constitutes a multiplex power supply (N + 1 redundant power supply) including a standby power supply without providing a backflow prevention diode in the power supply module. ..

[0008]

SUMMARY OF THE INVENTION In a multiplex power supply, the present invention draws a common power supply bus voltage during operation into a replacement power supply module connected instead of a failed power supply module, and replaces the replacement power supply module. By previously charging (precharging) the output voltage smoothing capacitor, it is possible to perform normal hot-swap without using a backflow prevention diode.

[0009]

The function of the output voltage smoothing capacitor of the replacement power supply module in the preliminary state is precharged by the operating common power supply bus voltage. Therefore, the defective power supply module is removed and the replacement power supply module is plugged into the plug-in connector. Avoid the inconvenience that the output voltage during operation (common power supply bus voltage) is short-circuited by the output voltage smoothing capacitor of the replacement power supply module when connected in parallel via the above, causing the bus voltage to drop sharply and significantly. You can This enables normal hot-swap without using a backflow prevention diode, omitting the backflow prevention diode,
It is possible to reduce the module size, improve reliability, save current, and reduce costs.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. First, a first embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a block diagram showing a configuration of a multiplex power supply device according to a first embodiment of the present invention. Here, for simplification of description, a state in which two power supply modules are connected in parallel is taken as an example. Although shown, it includes a case where a plurality (N) of power supply modules that are operated at the same time and one replacement power supply module in a standby state are configured (N + 1 redundant).

In FIG. 1, reference numerals 10 (0) and 10 (1) denote power supply modules that form a multiplexed power supply.
Here, the power supply module 10 (0) is shown as a replacement (replacement) of a defective product, and the power supply module 10 (1) is shown as a power supply module currently in operation. Vin and VinRTN are the power supply module 10 (0),
10 (1) is the input power supply voltage that is the primary power supply voltage,
AC or DC input voltage. RL is a load connected to the multiplex power supply, and the power supply module 10 (0),
Power is supplied from 10 (1). BJ1 and BJ2 are jacks of the plug-in connector, and the power supply module 1
It exchanges power with 0 (0) and 10 (1). P1 is a plug of a plug-in connector attached to the power supply module 10 (0), 10 (1), and is a jack BJ1,
Combines with BJ2. HP1 and HP2 are plugs for connectors, which connect the jacks J1 of the power supply modules 10 (0) and 10 (1) to each other, and are connected by the maintenance staff at the time of maintenance. J1 is a connector jack attached to the power supply modules 10 (0) and 10 (1), and is connected to the connector plugs HP1 and HP2. 1 to 7 are the above connectors (BJ1, BJ2, P1, HP1, HP2, J1)
) Is the pin number of the contact.

Reference numeral 8 is a precharging harness for connecting the jack J1 of the power supply module 10 (0) and the jack J1 of the power supply module 10 (1), and the power is supplied through the connector plugs HP1 and HP2 connected to the ends. Connect the jacks J1 of the modules 10 (0) and 10 (1) to each other. + Vo, + Vo RTN is power supply module 10
The output voltages of (0) and 10 (1) are supplied to the load RL. FIG. 2 is a block diagram showing a circuit configuration of each power supply module 10 in FIG.

In FIG. 2, reference numerals 1 to 4 are contacts of the connector plug P1, and the power supply module 10
(0) and 10 (1) are connected in parallel. That is, the input voltage Vin is commonly supplied to each of the power supply modules 10 (0), 10 (1) through the contacts 3, 4 of the connector plug P1.
The output voltage (1) is output to the common power supply bus via the contacts 1 and 2 of the connector plug P1.

Numerals 5 to 7 are contacts of the connector jack J1 for connecting the power supply modules 10 (0) and 10 (1) to each other via the precharging harness 8 (0). That is, the charging current is supplied to the mating power supply module through the contacts 5 and 7 of the connector jack J1, and the charging current from the mating power supply module is input through the contacts 6 and 7 of the connector jack J1. Two
Reference numeral 0 denotes a switching power supply unit, which receives an input voltage Vin and outputs a DC output voltage Vo. The internal circuit configuration of the switching power supply unit 20 is shown in FIG. Reference numerals 21 and 22 are input terminals of the switching power supply unit 20 and have an input voltage Vin.
Receive. Reference numerals 23 and 24 denote output terminals of the switching power supply unit 20, which output a DC output voltage Vo. Reference numeral 25 denotes a dummy circuit terminal of the switching power supply unit 20, which is connected to the output terminal 23 when the switch 26 is in the operating position (a).

Reference numeral 26 is a two-circuit, two-contact interlock switch 26-
Maintenance / operation changeover switch 2 composed of 1 and 26-2
6 and has a maintenance position (b) and an operating position (a),
Maintenance personnel operate the replacement power supply module. R1
Is a charging current limiting resistor that limits the charging current supplied from another (counterpart) power supply module. FIG. 3 is FIG.
2 is a block diagram showing a circuit configuration of a switching power supply unit 20 in FIG.

In FIG. 3, reference numeral 40 is a switching circuit (SW-P), which rectifies and smoothes the input voltage (Vin, VinRTN) in the case of alternating current and leaves it as it is in the case of direct current, and a high frequency alternating current by a switching transistor. The voltage is converted and output from the output terminals 43 and 44. 41 and 42 are input terminals of the switching circuit 40. 43 and 44 are output terminals of the switching circuit 40.

T is a transformer for receiving the output of the switching circuit 40, Np is a primary winding, and Ns is 2
It is the next winding. This transformer T is a switching circuit 4
The AC voltage output from the 0 output terminals 43 and 44 is insulated, converted into a different voltage, and output. RECT is a rectifying diode assembly, which rectifies the voltage converted by the transformer T.

L1 is a smoothing choke coil, C1 is a smoothing capacitor, and RECT removes the ripple component of the voltage rectified by the rectifying diode assembly RECT to obtain a DC voltage. D2 is a charge completion indicating light emitting element (charge completion indicating LED), which is driven to light when the voltage of the smoothing capacitor C1 is charged to a specified value. R2 is a resistor that limits the light emission current of the light emitting element (LED) D2.

R3 is a dummy resistor, which is provided so as to operate stably even when the load of the switching power supply unit 20 is removed. When the maintenance / operation changeover switch 26 is put in the operating position (a), the switching power supply unit 20 is provided. Is connected between the output terminals 23 and 24 of.

Reference numeral 50 denotes an error amplifier circuit (E / AU) which compares the output voltage Vo between the output terminals 23 and 24 with a predetermined reference voltage and outputs a correction signal according to the magnitude of the error. To do. Reference numerals 51 and 52 are input terminals of the error amplification circuit 50, and 53 is an output terminal of the error amplification circuit 50.

Reference numeral 45 denotes a control signal input terminal of the switching circuit 40, which controls the switching duty ratio according to the output signal (correction signal) of the error amplification circuit 50,
The output voltage Vo between the output terminals 23 and 24 is controlled to be constant. An output voltage abnormality detection circuit (ALM-U) 60 outputs an abnormality signal when the secondary voltage of the transformer T is out of the specified range. 61 and 62 are input terminals of the output voltage abnormality detection circuit 60, and 63 is an output voltage abnormality detection circuit 6
0 output terminal.

Reference numeral 46 denotes an abnormality signal input terminal of the switching circuit 40, which stops the switching operation upon receiving the abnormality detection signal output from the output terminal 63 of the output voltage abnormality detection circuit 60, and at the same time displays an abnormality indicating light emitting element (abnormality). The display LED) D1 is driven to emit light. By the light emission of the abnormality indication light emitting element (abnormality indication LED) D1, the maintenance personnel can identify which power supply module is down during the parallel operation. Reference numeral 47 is a terminal for connecting the abnormality display light emitting element of the switching circuit 40. FIG. 4 is a block diagram showing the configuration of the output voltage abnormality detection circuit (ALM-U) 60 shown in FIG.
In FIG. 4, D61 is a diode, which rectifies the secondary voltage of the transformer T and supplies it to the low-pass filter U61.
U61 is a low-pass filter that extracts a DC component proportional to the output voltage from the secondary voltage of the transformer T.

IC61 and IC62 are comparators, and the comparator (OV) IC61 is the low-pass filter U.
The DC component output from 61 is compared with the reference voltage REFOV, and the comparator (UV) IC 62 compares the DC component with the reference voltage REFUV, and the DC component is REFUV to R
When it goes out of the EFOV range, the comparators IC61, IC
One of the outputs of 62 becomes "H" (high) level.

R61 and R62 are comparators IC61 and IC62
Is a pull-up resistor for pulling up the output line of V.sub.cc to the Vcc potential, and limits the current when the outputs of the comparators IC61 and IC62 are at "L" level.

Vcc is an auxiliary power supply for pulling up the output lines of the comparators IC61 and IC62, and when the outputs of the comparators IC61 and IC62 are at "H" level, the output lines are pulled up to the Vcc potential. D62, D63
Is a diode, and the two comparator IC61,
OR output of IC62.

U62 is a circuit for invalidating the comparison operation (UV detection) of the comparator (UV) IC62, and inhibits the UV detection operation by the IC62 until the output voltage Vo is established at the time of startup. Here, the operation of the first embodiment of the present invention will be described with reference to FIGS.

During parallel operation of the power supply modules 10 (0) and 10 (1), either power supply module (for example, 10
If (Z) is a failure (abnormality occurs), the failure (abnormality) of the power supply module 10 (z) is displayed by lighting an abnormality indicating light emitting element (abnormality indicating LED) D1 provided in the module. The maintenance staff prepares a normal replacement power supply module 10 (0) and a precharge harness 8. Then, the defective power supply module 10 (z) is removed.

The operating power supply module 10 (1) and the prepared replacement power supply module 10 (0) are connected by the precharging harness 8. At this time, the maintenance / operation changeover switch 26 of the prepared replacement power supply module 10 (0) is set to the maintenance position (b). As a result, the smoothing capacitor C1 of the replacement power supply module 10 (0) prepared
Is charged (precharged).

Upon completion of charging of the smoothing capacitor C1 provided in the replacement power supply module 10 (0), the charge completion indicating light emitting element (charge completion indicating LED) D2 provided in the power supply module is turned on.

Replacement power supply module 10 (0) prepared
Is connected in parallel to another operating power supply module 10 (1) by the plug-in connectors (P1, BJ1). This state is shown in FIG. After that, the maintenance / operation changeover switch 26 of the replacement power supply module 10 (0) prepared
Is switched to the driving side (a), and the precharge harness 8 is removed. This completes the hot-line insertion / extraction.

When a healthy (normal) module or a defective (abnormal) module in an operating state is hot-plugged, the maintenance / operation selector switch 26 is set in advance to the maintenance position (b).
Set to. Thus, when the power supply module is healthy (normal), the input voltage is dropped and the switching operation is stopped. By this operation stop, the load current shared by this power supply module is borne by the remaining operating power supply module. This load can be gradually changed by stopping the switching operation while gradually lowering the duty ratio when the maintenance / operation changeover switch 26 is tilted to the maintenance position (b). Next, FIGS.
Another embodiment of the present invention will be described with reference to FIG. FIG. 5 shows a second embodiment of the present invention, and here shows a configuration example in which a precharge power source is supplied by a precharge-dedicated connection connector.

In FIG. 5, BJ2 is a jack of the precharge connector, and each power supply module (# 1 to #
N) Power bus (P common to 10 (1), 10 (1), ...
-BUS) and becomes a terminal for taking out the voltage (+ Vo to + Vo RTN) for charging (for precharging).

Reference numeral 8 (1) is a precharge harness for supplying the charging current (precharge current) on the power bus (P-BUS) to the spare replacement power module (# N + 1) 10 (0). Yes, the replacement power supply module (# N + 1) 10 (0) to be precharged is circuit-connected to the precharge connector BJ2. 10
(1), 10 (1), ... Are N power supply modules (# 1 to #N) in operation, and 10 (0) are one replacement power supply module.

Reference numeral 100 denotes an unstable power supply which is supplied to each power supply module, and the output power supply voltage becomes the input voltage Vin of each power supply module. This unstable power supply 100
Outputs a DC or AC voltage according to the input specifications of each power supply module.

R4 is a dummy resistor common to the above power supply modules, and is provided in place of the dummy resistor R3 inside the power supply module as shown in FIG. If a common dummy resistor R4 is provided instead of the internal dummy resistor R3, the maintenance / operation changeover switch 26 can be omitted. The reason is that in FIG. 5, after the replacement power supply module 10 (0) is precharged and the precharge harness 8 (1) is removed, a discharge path by a dummy resistor or the like is formed at the voltage output terminal. This is because the charge of the smoothing capacitor C1 is not lost.

FIG. 6 shows the third embodiment of the present invention. Here, the jack BJ2 of the precharge connector as shown in FIG. 5 is not provided, but instead of this, the replacement power supply module 10 ( 0) is effectively utilized for the plug-in connector BJ1.

In FIG. 6, reference numeral 8 (2) is a pre-charging harness for supplying a charging current (pre-charging current), which is an exchange target for pre-charging via connector plugs HP1 and HP2. Power supply module 10
Connect (0) to plug-in connector BJ1. HP2
Is a plug of the connector for connection, and is connected to the charging connector jack J1 of the power supply module. Other components are the same as those in FIG.

In the configurations shown in FIGS. 5 and 6 described above, as the precharge power source, the voltage of the power supply bus (P-BUS) is taken out from the precharge connector BJ2 or the plug-in connector BJ1 and precharged. Becomes N
It is supplied to the + 1st replacement power supply module (# N + 1).

At this time, the replacement power supply module (# N +
The smoothing capacitor C1 of 1) has the same module (#N
+1) to the jack J1 via the precharging harness 8 (1) or 8 (2), the power bus (P-BU
Charging is performed by applying the output voltage (Vo to Vo RTN) of S).

In both of the above FIG. 5 and FIG.
Since the dummy resistor R3 does not exist inside the power supply module and the dummy resistor R4 is provided outside,
With the precharge harness 8 removed, a discharge path due to a dummy resistor or the like is not formed at the voltage output end, and the charge of the smoothing capacitor C1 is not lost. Therefore, the internal dummy resistor and the maintenance / operation changeover switch 26 are It can be eliminated and the configuration can be simplified.

FIGS. 7 to 9 show the fourth embodiment of the present invention, respectively, and show the circuit configuration when the precharge power source is input to the plug-in connector via the pin conversion harness. .. 7 to 9,
R1 is a charging current limiting resistor that suppresses the charging current of the smoothing capacitor C1 of the power supply module. Reference numeral 9 denotes one charging pin (charging contactor) provided on the plug-in connector. Reference numerals 8 (3), 8 (4), and 8 (5) are harnesses for precharging, and supply the power supply bus voltage Vo to the charging contacts 9 of the plug-in connector. Each of the above precharge harnesses 8 (3), 8 (4), 8 (5)
May be replaced with an extender card extender.

In FIG. 8, 26A is composed of interlocking switches 26 (a1) and 26 (a2) with two circuits and three contacts.
It is a maintenance / operation changeover switch and is provided with each position for operation / charging / holding. This maintenance / operation changeover switch 26A
Is maintained at the holding position, it is possible to prevent the charge of the smoothing capacitor C1 from decreasing.

In FIG. 9, reference numeral 20 (1) is a switching power supply section, which is obtained by removing the charge completion indication issuing element (charge completion indication LED) D2 and the resistor R2 from the configuration of FIG. D2, R2) is the switching power supply 2
This is a configuration provided outside 0 (1).

Reference numeral 26 (b) is a switch, which is a maintenance / operation switching switch having a charging / holding switching position. By holding the switch 26 (b) in the holding position, the charge of the smoothing capacitor C1 is changed. You can prevent the decrease.

In the configuration of FIG. 9, the power supply bus (+ Vo-
+ Vo TRN) is provided with a dummy resistor R4 common to each power supply module, whereby the internal dummy resistor R3 can be omitted.

FIG. 10 shows a fifth embodiment of the present invention, in which a precharge circuit is not provided but a precharge power source is inputted from a plug-in connector through a precharge harness. There is. That is, here, a configuration is shown in which the charging contacts shown in FIGS. 7 to 9 are omitted and a charging current suppressing circuit (implemented by a current limiting resistor or the like) is incorporated in the precharging harness.

In FIG. 10, reference numeral 8 (6) is a precharging harness having a charging current limiting resistor R1, and a power supply bus voltage (+ Vo to + Vo RTN) is plugged in through the charging current limiting resistor R1. Supply to the output terminal of the connector.

26B is an interlock switch 26 having two circuits and two contacts.
-1 and 26-2 are maintenance / operation changeover switches 26, and a dummy resistor R3 is connected via a terminal 25 during operation (position a) (see FIG. 3). When a dummy resistor R4 common to each power source module is provided between the power source bus voltages (+ Vo to + Vo RTN) (see FIGS. 5 and 6), the internal dummy resistor R3 can be omitted and the switch 26- 2 can also be omitted.

In this embodiment, the precharge harness 8 is provided between the replacement power supply module 10 (0) and the plug-in connector for connecting the common power supply bus (P-BUS) to each power supply module. The smoothing capacitor C1 is charged in advance via (6). And after charging is complete,
The harness 8 (6) for precharging is removed, and the plug-in connectors are directly connected. After that, the maintenance / operation switch 26 is switched to the operation state (position a). Also in this embodiment, the precharge harness 8 (6) can be realized by the card extender. FIG. 11 shows a sixth embodiment of the present invention, in which a dedicated charger is used as a precharge power source. In FIG. 11, reference numeral 8 (7) is a precharge harness for connecting the charger 101 and the plug-in connector P1 of the replacement power supply module 10 (0). Reference numeral 101 denotes a charger dedicated to precharging, which supplies a charging current (precharging current) to the replacement power supply module 10 (0).

In the embodiment shown in FIG. 11, a replacement power supply module 10 (0) is used by using a separately prepared charger 101 as the precharge power supply instead of the power supply bus voltage.
The charging current (pre-charging current) is supplied from the plug P1 of the plug-in connector. When the charger 101 is used, the replacement power supply module 10 (0)
A charging connector may be provided in a part of the.

When a dummy resistor R4 common to each power source module is provided on the power source bus (P-BUS) common to each power source module (see FIGS. 5 and 6), each dummy resistor inside the power source module is used. R3 may be omitted. In this case, the maintenance / operation changeover switch 26 can be omitted. An application example of each of the above embodiments will be illustrated below.

As the precharge completion display means, for example, the voltage level of the smoothing capacitor C1 may be detected by a comparator or the like. Alternatively, a means for measuring the time corresponding to the charging time of the smoothing capacitor C1 may be used, and for example, a timer for timekeeping may be provided to display the completion of charging after charging for a predetermined time. Alternatively, a voltage measuring terminal of the smoothing capacitor C1 may be provided and the voltage across the smoothing capacitor C1 may be measured with a tester, a voltmeter or the like.

Alternatively, the precharge harness may be removed after connecting the replacement power supply module without providing the maintenance / operation changeover switch. In this case, when the input voltage Vin is supplied by connecting the replacement power supply module,
The switching power supply unit 20 may be automatically started, or when the replacement power supply module is connected, an ON signal is sent from the CPU on the load side to the switching power supply unit 20 via the power ON / OFF signal line. Good.

In FIG. 2, when the maintenance / operation changeover switch is omitted, a dummy resistor R inside the power supply module is used.
3 is connected in parallel to the smoothing capacitor C1 (see FIG. 3). In this case, the voltage of the smoothing capacitor C1 at the time of precharging is regulated by the voltage dividing circuit formed by the dummy resistor R3 and the limiting resistor R1. Therefore, the voltage across the smoothing capacitor C1 is Vo * R3 / ( R1 + R
It only goes up to 3). Therefore, when the replacement power supply module is connected to the power supply bus by connecting the plug-in connector, it is necessary to set the voltage at the completion of precharging of the smoothing capacitor C1 so that the bus voltage dip does not become a problem. is there.

An overcurrent detection signal of the power supply module may be added to the output voltage abnormality detection circuit 60 shown in FIGS. The overcurrent detection can also be performed by the input current (current of the terminal 21) or the output current (current of the terminal 23) of the switching power supply unit 20.

[0057]

As described in detail above, according to the multiplex power supply device of the present invention, the common power supply bus voltage during operation is drawn into the replacement power supply module connected in place of the failed power supply module, and the replacement power supply is connected. Since the output voltage smoothing capacitor of the module is pre-charged (pre-charged), the power supply module can be hot-plugged and unplugged normally without using the backflow prevention diode. ..

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of a first embodiment of the present invention.

2 is a block diagram showing a circuit configuration of each power supply module 10 in FIG.

3 is a block diagram showing a circuit configuration of a switching power supply unit 20 in FIG.

4 is a block diagram showing a configuration of an output voltage abnormality detection circuit (ALM-U) 60 in FIG.

FIG. 5 is a block diagram showing a configuration of a second exemplary embodiment of the present invention.

FIG. 6 is a block diagram showing a configuration of a third exemplary embodiment of the present invention.

FIG. 7 is a block diagram showing a configuration of a fourth exemplary embodiment of the present invention.

FIG. 8 is a block diagram showing a modification of the fourth embodiment of the present invention.

FIG. 9 is a block diagram showing a modification of the fourth embodiment of the present invention.

FIG. 10 is a block diagram showing a configuration of a fifth exemplary embodiment of the present invention.

FIG. 11 is a block diagram showing a configuration of a sixth exemplary embodiment of the present invention.

FIG. 12 is a diagram showing an equivalent circuit when connecting multiple modules of a conventional multiplex power supply.

[Explanation of symbols]

10 (0), 10 (1) ... Power supply module, 8 ... Precharging harness, 20 ... Switching power supply unit 21,
22 ... Input terminal, 23, 24 ... Output terminal, 25 ... Terminal,
26 ... Maintenance / operation changeover switch, 40 ... Switching circuit (SW-P), 41, 42 ... Input terminals, 43, 44 ...
Output terminal, 45 ... Control signal input terminal, 46 ... Input terminal,
47 ... Light emitting element connection terminal, 50 ... Error amplification circuit (E / A
-U), 51, 52 ... Input terminal, 53 ... Output terminal, 60
... Output voltage abnormality detection circuit (ALM-U), 61, 62 ...
Input terminal, 63 ... Output terminal, 100 ... Unstable power supply, 10
1 ... Charger, Vin, VinRTN ... Input power supply voltage (primary power supply voltage), RL ... Load, BJ1, BJ2 ... Plug-in connector jack, P1 ... Plug-in connector plug, HP1, HP2 ... Connector plug, J1 ... Connector jack, + Vo, + Vo RTN ... Output power supply voltage,
P1 ... Connector plug contact, R1 ... Charging current limiting resistance, R3, R4 ... Dummy resistance, R2, R61, R
62 ... Resistance, T ... Transformer (transformer), Np ... Primary winding,
Ns ... Secondary winding, RECT ... Rectifying diode assembly, L1 ... Smoothing choke coil, C1 ... Smoothing capacitor, D1 ... Abnormality indication light emitting element (abnormality indication LED), D
2 ... Charge completion indicator light emitting element (charge completion indicator LED), U
61 ... Low-pass filter, IC61, IC62 ... Comparator, Vcc ... Auxiliary power supply, D61, D62, D63 ... Diode,
U62 ... Circuit that disables UV detection, P-BUS ... Power supply bus.

Claims (9)

[Claims] 1. A plurality of power supply modules provided with output voltage smoothing capacitors, a mechanism for connecting the output terminals of the power supply modules in parallel by plugging in the plurality of power supply modules, and A multiplex power supply device comprising: a precharge terminal provided in the power supply module; and means for precharging the power supply module in a preliminary state via the precharge terminal. 2. A connector is used as a precharge terminal,
The connector is provided with a harness that is connected in parallel and is connected to the output voltage circuit of the power supply module in operation,
2. The multiplexed power supply device according to claim 1, wherein the output voltage smoothing capacitor of the power supply module in the standby state is charged with the output voltage of the power supply module in the operating state via the connector and the harness. 3. The multiplex power supply device according to claim 1, wherein the power supply modules connected in parallel are provided with a switch for switching between a charging mode and an operation mode, and the charging circuit in the module itself is cut off in the operation mode. .. 4. A power supply module, an insulating transformer in which an output of a switching circuit is supplied to a primary winding, a low-pass filter for detecting an average rectified voltage value of a secondary winding voltage of the insulating transformer, and a low-pass filter for the same. 3. A circuit for comparing the detected voltage value with a reference value and, when the detected voltage value of the filter deviates from the reference value, determines that the power supply module is defective. Multiplexed power supply as described. 5. A plurality of power supply modules, each having an output voltage smoothing capacitor and a charging circuit, including a replacement power supply module, and output terminals of the respective power supply modules connected in parallel on a common power supply bus. A circuit for outputting, a connector for taking out the voltage on the power supply bus, a charging connector for guiding the power supply bus voltage of the connector to the charging circuit of the replacement power supply module and precharging the output voltage smoothing capacitor of the replacement power supply module, and A multiplexed power supply device comprising a harness. 6. A plurality of power supply modules, each having an output voltage smoothing capacitor and a charging circuit, including a replacement power supply module, and output terminals of the respective power supply modules are connected in parallel on a common power supply bus. A circuit for outputting, a connector for taking out the voltage on the power supply bus, a circuit connecting means composed of a harness or an extender board for connecting the connector and the plug-in connector of the replacement power supply module, and a charging current path of the circuit connecting means. A multiplex power supply device, comprising: a charging current suppressing circuit connected in series to control a precharge current to the output voltage smoothing capacitor of the replacement power supply module. 7. A plurality of power supply modules including a replacement power supply module, each having an output voltage smoothing capacitor and a charging circuit, and a charging contact provided in a plug-in connector of the replacement power supply module. , A plug-in connector provided corresponding to each of the power supply modules for connecting the output terminals of the power supply modules in parallel and outputting on a common power supply bus, and the power bus connection terminal of the plug-in connector and the exchange Charging circuit provided with a plug-in connector of the power supply module for power supply, and a charging circuit connecting means composed of a harness or an extender board for supplying a precharge current to the output voltage smoothing capacitor of the replacement power supply module. Multiplexed power supply device characterized by the following. 8. A plurality of power supply modules including a replacement power supply module provided with an output voltage smoothing capacitor,
A plug-in connector provided corresponding to each of the power supply modules for connecting the output terminals of the power supply modules in parallel and outputting on a common power supply bus; a charger dedicated to the replacement power supply module; And a circuit connecting means for precharging the output voltage smoothing capacitor of the replacement power supply module by a charger. 9. A dummy resistor common to each power supply module is provided on a power supply bus to which output terminals of each power supply module constituting the multiplexed power supply are connected in parallel.
Alternatively, the multiplex power supply device according to 6 or 7 or 8.