JPS63182679U

JPS63182679U -

Info

Publication number: JPS63182679U
Application number: JP7182687U
Authority: JP
Priority date: 1987-05-15
Filing date: 1987-05-15
Publication date: 1988-11-24

Description

[Brief explanation of the drawing]

第１図は本考案によるスイツチング電源回路の
一実施例を示す回路図、第２図Ａ〜Ｃは各々この
第１図に示す回路の波形図、第３図は従来からあ
るスイツチング電源回路の回路の一例を示す回路
図、第４図Ａ〜Ｃは各々この第３図に示す回路の
波形図、第５図は従来からあるスイツチング電源
回路の他の例を示す回路図、第６図Ａ〜Ｃは各々
この第５図に示す回路の波形図、第７図は従来か
らあるスイツチング電源回路の他の例を示す回路
図、第８図Ａ〜Ｃは各々この第７図に示す回路の
波形図である。３３…電圧変換部（スイツチングトランス）、
３５…直流電圧生成部（出力側整流平滑部）、３
６…電源異常検出用整流平滑部、３８…電源異常
検出部、４０…ダイオード、４１…整流用のダイ
オード。 Figure 1 is a circuit diagram showing one embodiment of the switching power supply circuit according to the present invention, Figures 2A to C are waveform diagrams of the circuit shown in Figure 1, and Figure 3 is a circuit diagram of a conventional switching power supply circuit. A circuit diagram showing an example, FIGS. 4A to 4C are waveform diagrams of the circuit shown in FIG. 3, and FIG. 5 is a circuit diagram showing another example of the conventional switching power supply circuit, and FIGS. 6A to 6 C is a waveform diagram of the circuit shown in FIG. 5, FIG. 7 is a circuit diagram showing another example of a conventional switching power supply circuit, and FIGS. 8A to C are waveform diagrams of the circuit shown in FIG. 7. It is a diagram. 33...Voltage converter (switching transformer),
35...DC voltage generation section (output side rectification smoothing section), 3
6... Rectifying and smoothing unit for power supply abnormality detection, 38... Power supply abnormality detection unit, 40... Diode, 41... Diode for rectification.

Claims

[Scope of utility model registration request]

It has a voltage converter that switches the power supply voltage supplied from the outside and converts it into an AC voltage, and a rectifying diode, and the diode converts the AC voltage output from the voltage converter into a DC voltage. It also has a DC voltage generator that supplies this DC voltage to the load side, and a diode with a lower drop voltage in the forward direction than the rectifier diode, and the AC voltage output from the voltage converter by this diode. a rectifying and smoothing section for detecting power supply abnormality that rectifies the voltage, and when AC voltage is no longer output from the voltage converting section based on the output of the rectifying and smoothing section for detecting power supply abnormality, this is detected and a power supply abnormality signal is generated. 1. A switching power supply circuit comprising a power supply abnormality detection section.