JPH031689U

JPH031689U -

Info

Publication number: JPH031689U
Application number: JP6069489U
Authority: JP
Priority date: 1989-05-25
Filing date: 1989-05-25
Publication date: 1991-01-09

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例の構成ブロツク図、
第２図は動作の一例を示すタイムチヤート、第３
図は本考案の他の実施例の構成ブロツク図、第４
図は突入電流制限機能を備えた従来の直流電源装
置の構成ブロツク図、第５図は第４図回路の動作
を説明するための波形図である。１０…突入電流制限回路、２０…メイントラン
ス、３０…整流平滑回路、４０…パル入幅制御回
路、５０…スタート／ストツプ回路、６０…タイ
マー回路、７０…ピーク保持回路、８０…比較器
、Ｑ１…スイツチング素子。 FIG. 1 is a block diagram of an embodiment of the present invention.
Figure 2 is a time chart showing an example of operation, Figure 3 is a time chart showing an example of operation.
The figure is a block diagram of another embodiment of the present invention.
This figure is a block diagram of a conventional DC power supply device having an inrush current limiting function, and FIG. 5 is a waveform diagram for explaining the operation of the circuit of FIG. 4. 10... Rush current limiting circuit, 20... Main transformer, 30... Rectifying and smoothing circuit, 40... Pulse input width control circuit, 50... Start/stop circuit, 60... Timer circuit, 70... Peak holding circuit, 80... Comparator, Q1 ...Switching element.

Claims

[Claims for Utility Model Registration] (1) Rectifying and smoothing the input AC power supply, turning the DC voltage on and off using a switching element and applying it to the primary winding of the transformer, and rectifying the signal generated in the secondary winding. A circuit consisting of a main converter that smoothes and obtains a DC voltage, a current limiting resistor, and a triax connected in parallel is inserted into the current path from the input AC power supply, and the triax is turned on and off by the output signal of the main converter. In a power supply device equipped with a current limiting circuit, a pulse width control circuit for controlling on/off of the switching element is a primary side control type pulse having an on/off terminal capable of controlling operation of pulse width control. An inrush pulse of a DC power supply configured to use a width control circuit and apply a signal generated in relation to the magnitude of a smoothed voltage obtained by rectifying and smoothing an input AC power supply to an on/off terminal of the pulse width control circuit. Current limit circuit. (2) A start/stop circuit that detects when the smoothed voltage obtained by rectifying and smoothing the input AC power reaches a predetermined value by detecting a signal generated in relation to the magnitude of the smoothed voltage obtained by rectifying and smoothing the input AC power. and a timer circuit for delaying the signal from the start/stop circuit for a predetermined period of time. (3) A signal generated in relation to the magnitude of the smoothed voltage obtained by rectifying and smoothing the input AC power source is connected to a peak holding circuit that holds the peak value of the input AC power source, and the peak value from this peak holding circuit and the input signal. 2. The inrush current limiting circuit for a DC power source according to claim 1, wherein the inrush current limiting circuit for a DC power source is obtained by a comparator that compares the smoothed voltage obtained by rectifying and smoothing the AC power source.