JPH0397716U

JPH0397716U -

Info

Publication number: JPH0397716U
Application number: JP581790U
Authority: JP
Priority date: 1990-01-25
Filing date: 1990-01-25
Publication date: 1991-10-08

Description

[Brief explanation of drawings]

第１図はこの考案の一実施例を示す直流電源装
置の構成図、第２図は従来の直流電源装置の構成
図である。図において、１……一次電源、２……フイルタ
回路、３，１０，２４，２５，２６……ダイオー
ド、４……制御回路、５……コンデンサ、６……
トランジスタ、７……トランス、８……整流回路
、９……負荷、１１，１２，１８，１９，２０，
２１，２２，２３……抵抗、１３……比較回路、
１４，２７……瞬断検出回路、１５，１６，１７
……カレントトランスである。なお、図中同一符
号は同一または相当部分を示す。 FIG. 1 is a block diagram of a DC power supply device showing an embodiment of this invention, and FIG. 2 is a block diagram of a conventional DC power supply device. In the figure, 1...Primary power supply, 2...Filter circuit, 3, 10, 24, 25, 26...Diode, 4...Control circuit, 5...Capacitor, 6...
Transistor, 7... Transformer, 8... Rectifier circuit, 9... Load, 11, 12, 18, 19, 20,
21, 22, 23...Resistor, 13...Comparison circuit,
14, 27...Momentary interruption detection circuit, 15, 16, 17
...It is a current transformer. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims

[Scope of utility model registration request]

a control circuit that detects a voltage supplied to a load and controls the pulse width of a pulse signal; a transistor that performs a switching operation based on an output signal of the control circuit;
A transformer having one end of a primary winding connected to the collector of the transistor and having at least one secondary winding, a capacitor supplying pulsed power to the transformer, and converting alternating current power supplied from the primary power source into direct current. a first plurality of diodes,
a filter circuit that prevents high frequency current caused by the rectification by the first diode group and the switching operation of the transistor from flowing out to the primary power source side; and a line in series for each phase between the primary power source and the first diode group. A current detection transformer connected thereto, a second group of diodes that rectify the output of the current detection transformer, and a comparison circuit that adds the outputs of the second group of diodes and compares the added value with a reference voltage value. A DC power supply device characterized by: