JPH0179389U

JPH0179389U -

Info

Publication number: JPH0179389U
Application number: JP1987173365U
Authority: JP
Priority date: 1987-11-13
Filing date: 1987-11-13
Publication date: 1989-05-29

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例を示す構成ブロツク
図、第２図は検出器２８の動作説明図、第３図は
本考案の第２の実施例を示す構成ブロツク図であ
る。第４図は従来装置の構成ブロツク図である。１０……コンバータ部、１３……スイツチング
素子、Ｔ１……トランス、２１……比較器、２２
……ＰＷＭ制御部、２４……保護部、２６……信
号伝達トランス、２７……発振器、２８……検出
器、Ｖ_ｔｈ１，_２……基準電圧。 FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is an explanatory diagram of the operation of the detector 28, and FIG. 3 is a block diagram showing a second embodiment of the present invention. FIG. 4 is a block diagram of a conventional device. 10...Converter section, 13...Switching element, T1...Transformer, 21...Comparator, 22
... PWM control section, 24 ... protection section, 26 ... signal transmission transformer, 27 ... oscillator, 28 ... detector, V _th1 , ₂ ... reference voltage.

Claims

[Claims for Utility Model Registration] A converter section that turns on and off the DC voltage input to the primary side of the transformer using a switching element, rectifies and smoothes the switching signal output to the secondary side, and outputs the rectified and smoothed signal, and this output voltage as a reference. an error section that compares the voltage; a PWM control section that transmits a control signal to the switching element to stabilize the output voltage based on the error signal output from the error section; and the output signal is an overvoltage or an overcurrent. A switching power supply equipped with an output stabilizing circuit consisting of a protection section that transmits an alarm signal to the PWM control section to protect the converter section when the PWM control section occurs, and a remote control switch that allows the supply of the output voltage of the converter section. a signal transmission transformer in which the alarm signal of the protection unit and the remote control switch are connected to a side corresponding to the secondary side of the transformer; an oscillator connected to the primary side of the signal transmission transformer; a detection circuit that inputs the output voltage of the oscillator on the primary side of the signal transmission transformer, compares it with a first reference voltage and a second reference voltage higher than the first reference voltage, and outputs a comparison signal to the PWM control section; , and in response to the comparison signal, the PWM control section assumes that the remote control switch is instructing to turn off when the comparison signal is lower than the first reference voltage, and stops switching the first and second reference voltages. A comparison signal that is between the reference voltages of the second and second reference voltages indicates that the remote control switch is instructing to turn on and outputs a normal output, and a comparison signal that is higher than the second reference voltage indicates that an alarm signal is being output. Remote control of switching power to protect.