JPS62151906A - Power source device - Google Patents

Abstract

PURPOSE:To reduce the occurrence of noise by employing a semiconductor joint part such as a thyrister through the use of a solid relay when a main electric route with a great current is opened and closed. CONSTITUTION:A current limit resistance 7A is connected to any one of the solid relays 2A-2C serially connected to respective power source lines, and any one of the remaining relays is made conductive. Then a space between a smoothing circuit and the current limit resistance 7A becomes a closed circuit through the solid relays 2A-2C and a rectifier 3, and a current is flowed to charge the smoothing capacitor 9 of the smoothing circuit. At that time, the nonconductive solid relays 2A-2C are made conductive to short-circuit the current limit resistance 7A, and a steady DC voltage is outputted to the smoothing circuit. Then power source modules 4A-4B becoming large loads are started to complete the activation of a power source device. For stopping the power source device, first the power source modules 4A-4B are stopped, and then all the solid relays 2A-2C are opened, thereby completing the stoppage.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a power supply device, and particularly to a power supply device that uses a solid state relay to control the start and stop of supply of output voltage.

(Conventional technology) Conventional power supply devices used in computers, etc. are required to be more efficient, smaller, and more reliable, as the amount of power used increases as computers become faster and larger. Measures are also required to prevent outbreaks.

For this reason, AC power is often directly rectified into DC power, converted to high frequency, transformed, and rectified again to output the desired DC voltage.

A brief explanation will be given with reference to FIG. 3, focusing on the part where the receiver is responsible for starting and stopping the supply of the output of the power supply device which directly rectifies the AC input.

FIG. 3 shows an example of a conventional power supply device.

The power supply device shown in FIG. 3 includes a circuit breaker 26, alarm heaters 25A to 25C, a control section 21, and an electromagnetic switch 30.
．． 31, rectifier 23, and power supply modules 24A, 24
B, a current limiting resistor 27A, a dummy resistor 27B, a smoothing coil 28, and a smoothing capacitor 29.

The three-phase AC input from terminals R, , 8, and T is connected to circuit breaker 2.
6, supplies power to the control unit 21, passes through alarm heaters 25A to 25C for each phase, and reaches the electromagnetic switch 30. f? The alarm fuses 25A to 25C are used to send an alarm signal to the control unit 21 to request repair when a built-in fuse blows out.

When the electromagnetic switch 30 is activated from the control unit 21, the three-phase alternating current is rectified into three-phase full-wave rectification by the rectifier 23. When the smoothing capacitor 29 is charged,
The output current of the rectifier 23 is generally limited by the dummy resistor 27B.

Therefore, by closing the electromagnetic switch 31 with a command from the control unit 210 after a predetermined time has elapsed since the electromagnetic switch 30 is activated, a predetermined current can be extracted. From the control unit 21 to the power supply module 24A.

A signal is sent to 24'B to start the operation.

To stop the operation of the power supply device, first stop the operation of the power supply modules 24A and 24B, and then turn off the electromagnetic switch 30.
．． 31 is stopped and the contact is opened.

(Problem to be solved by the invention) In a conventional power supply device, a mechanically moving element such as an electromagnetic switch and an electrical contact at the tip are present in a relatively large part of the current, which is the main path of the current. Therefore, there is a drawback that noise may be generated due to the opening/closing of the contacts and reliability may be lowered. In a power supply device having at least one output voltage, a solid state relay has a contact inserted for each phase of an AC power supply and the connection/disconnection of the contact can be controlled from the outside, and the contact of any one of the solid state relays. At this time, the current limiting resistor inserted in the blood pressure sensor and any one of the solid state relays having the contact point in which the current limiting resistor is inserted are made conductive for a predetermined period of time. control means for making all the other solid state relays conductive to start supplying the output voltage when the time has elapsed, and for opening all the conductive solid state relays to stop supplying the output voltage. 0 (Embodiment) Next, an embodiment of the present invention will be described in detail with reference to the drawings.0 FIG. 1 is a block diagram showing a first embodiment of the present invention, and FIG.
The figure is a block diagram showing a second embodiment of the present invention.

First, an outline of an embodiment of the present invention will be explained with reference to FIG.

In the power supply device shown in FIG. 1, a circuit breaker 6. The AC voltage that has passed through the alarm fuses 58 to 50 is applied to the rectifier 3, converted to DC voltage, and then applied to a DC voltage that is smoothed by a smoothing coil 8 and a smoothing capacitor 9. form of power supply.

The power supply of the power supply is interrupted without mechanical operation, and the outside is SS.
It is equipped with a bidirectional thyristor, also called R (5 solid state relay), and when there is an external trigger etc. on its gate, when the instantaneous value of the AC voltage applied to it becomes less than a predetermined value. (
(also called zero crossing state), solid state relay 28~2C
It is possible to convert between the connected state and the disconnected state. Its operation is based on thyristors with opposite polarity connected in parallel and controlled by the presence or absence of voltage at their gates.
Solid state relays 2A-2C can also be implemented.

When one of the other solid state relays 2A to 2C connected to the series is brought into conduction, a closed circuit is created between the smoothing circuit and the current limiting resistor 7A through this solid state relay 2A to 2C and the rectifier 3, and current flows. Hiragishi capacitor 9 of the smoothing circuit is charged. Solid relay 2A which is not conducting at this time~
2C is made conductive, the current limiting resistor 7A is also short-circuited, and a steady DC voltage is output to the smoothing circuit. The power supply modules 4A to 4B, which are large loads of the 0th order, are started, and the power supply device is started. Complete.

Hello, shutting down the power supply means first shutting down power supply modules 4A~4B, then all solid state relays 28~2C.
Complete by releasing .

Next, an embodiment of the present invention will be described, focusing on its configuration and operation.

The power supply device shown in FIG. 1 includes a control section 1, a solid relay disconnector 6, a current limiting resistor 7A, a dummy resistor 7B, a smoothing coil 8, and a smoothing capacitor 9.

The three-phase AC input from terminals R, S, and T is connected to circuit breaker 6.
, supplies power to the control unit 1, passes through alarm heaters 5A to 5C for each phase, and connects solid relays 28 to 28.
It reaches 2C. First, when the solid state relay 2C is made conductive by the control unit 1, the alternating current input through the solid state relay 2C and the current limiting resistor 7A, which is connected in parallel to the two solid state relays and limits the inrush current, is rectified by the rectifier 3. When the smoothing capacitor 9 is charged through the smoothing coil 8, the output current of the rectifier 3 is approximately limited by the dummy resistor 7B.

Then, after a predetermined time after the solid state relay 2C becomes conductive, the solid state relay 2C is connected to the solid state L/-2A, 2 by a command from the control section 10.
By making B conductive, a predetermined current can be extracted.

Next, in order to stop the operation of the power supply modules 4A and 4 from the control unit 1, first
The purpose is achieved by stopping the operation of B and then opening the solid state relays 2A to 2C.

Next, the structure and operation of the power supply device shown in FIG. 2, which is a second embodiment of the present invention, will be explained.

The power supply device shown in FIG. 2 includes a control section 11 and a solid state relay 12.
A, 12B, rectifier 13, power module, dummy resistor 17B, smoothing coil 18, smoothing capacitor 19
It is equipped with

The power supply device shown in FIG. 2 receives a single-phase power source as an input.

The input single-phase alternating current passes through the circuit breaker 16 and is sent to the control unit 11.
and alarm fuses 15A and 15B.
through solid state relay 12A.

It reaches 12B.

First, when the solid state relay 12B is made conductive by the control unit 11, the AC input through the power supply limiting resistor 17A and the solid state relay 12B connected in parallel to the solid state relay 12A is rectified by the rectifier 13, and smoothed by the smoothing coil 18. When the capacitor 19 is charged, the output current of the rectifier 13 is generally limited by the dummy resistor 17B.

Therefore, after a predetermined time has elapsed since the solid state relay 12B becomes conductive, the solid state relay 12B is
By making A conductive, a predetermined current can be extracted.

Next, the power supply module 14A is sent from the control unit 11.

A signal is sent to 14B to start the operation.

To deactivate the power supply, first deactivate the power modules 14A, 14B, then turn on the solid state relay 12.
A and 12B are opened and the objective is achieved.

(Effects of the Invention) The power supply device of the present invention is configured to use semiconductor junctions such as thyristors using nine solid state relays to open and close the main circuit with a large current, so it generates less noise and is reliable. It has the effect of improving sex 0

[Brief explanation of drawings]

Fig. 1 is a block diagram showing a first embodiment of the present invention, Fig. 2 is a block diagram showing a second embodiment of the invention, and Fig. 3 is a block diagram showing a conventional example.・・・・・・
...Solid relay, 3,13.23...Rectifier, 4
A~4C, 14A~14C, 24A~24C...
7 source module, 58~5C, 15A...Current limiting resistor, 7B, 17B, 27B...Dummy resistor, 8,18.28...Smoothing coil, 9゜19 ．．
29... Smoothing capacitor, R, S, T...
Terminal, 30.31... Electromagnetic switch. ′〜、・

Claims (1)

[Scope of Claims] A power supply device that rectifies AC power supply voltage and has at least one output voltage, comprising: a plurality of solid bodies in which contacts are inserted for each phase of the AC power supply and connection/disconnection of the contacts can be controlled from the outside; a relay, a current limiting resistor inserted in parallel to the contact of any one of the solid relays, and any one of the solid relays having the contact in which the current limiting resistor is not inserted. When a predetermined time has elapsed from this time, all other solid state relays are made conductive to start supplying the output voltage, and all of the solid state relays that are conducting are opened to increase the output voltage. A power supply device comprising: control means for stopping supply.