JPH0340885U

JPH0340885U -

Info

Publication number: JPH0340885U
Application number: JP9997189U
Authority: JP
Priority date: 1989-08-29
Filing date: 1989-08-29
Publication date: 1991-04-19

Description

[Brief explanation of drawings]

第１図は従来装置のブロツク図、第２図、第３
図は本考案の一実施例を示すブロツク図及び回路
図である。図中Ｐは入力回路、Ｔはトランス、Ｓ
は出力回路、Ｃは制御回路、ａ，ｂはその出力検
出部及びスイツチング設定部、１はホトカプラ、
２及び３は演算増巾器、４は出力電流又は出力電
圧検出回路、５は基準電圧源、６は三角波発生回
路、７はドライブ回路、８は一次側回路のバイア
ス電源、９は二次側回路のバイアス電源である。 Figure 1 is a block diagram of the conventional device, Figures 2 and 3
The figures are a block diagram and a circuit diagram showing one embodiment of the present invention. In the figure, P is the input circuit, T is the transformer, and S
is an output circuit, C is a control circuit, a and b are its output detection section and switching setting section, 1 is a photocoupler,
2 and 3 are operational amplifiers, 4 is an output current or output voltage detection circuit, 5 is a reference voltage source, 6 is a triangular wave generation circuit, 7 is a drive circuit, 8 is a bias power supply for the primary side circuit, 9 is a secondary side This is the bias power supply for the circuit.

Claims

[Scope of utility model registration request]

a main switching element connected to the primary circuit of the transformer, a rectifier circuit connected to the secondary circuit of the transformer, and detecting the output current (or voltage) of the rectifier circuit to turn on the switching element;
In a switching power supply device that includes a control circuit that controls an off operation, the control circuit includes an output detection section that compares the output current (or voltage) with a reference value and sends out positive and negative error signals; 1. A switching power supply device comprising a switching setting section that controls the switching element according to the switching element.