JPS63182686U

JPS63182686U -

Info

Publication number: JPS63182686U
Application number: JP7392987U
Authority: JP
Priority date: 1987-05-18
Filing date: 1987-05-18
Publication date: 1988-11-24

Description

[Brief explanation of the drawing]

第１図は本考案に係るスイツチング電源の電気
回路図、第２図は本考案に係るスイツチング電源
の動作を説明するタイムチヤート、第３図は過電
流保護動作における出力電流―出力電圧特性図、
第４図は従来のスイツチング電源の電気回路図、
第５図は変圧器の巻線に現われる電圧波形図であ
る。３…変圧器、３１〜３３…巻線、４…スイツチ
ング素子、５…制御回路、６…補助電源回路、６
０１…ダイオード、６０２…抵抗、６０３…コン
デンサ、６０４…スイツチング素子、６０５…コ
ンデンサ、７…出力回路。 Fig. 1 is an electric circuit diagram of the switching power supply according to the present invention, Fig. 2 is a time chart explaining the operation of the switching power supply according to the present invention, and Fig. 3 is an output current-output voltage characteristic diagram in overcurrent protection operation.
Figure 4 is an electric circuit diagram of a conventional switching power supply.
FIG. 5 is a diagram of voltage waveforms appearing in the windings of the transformer. 3...Transformer, 31-33...Winding, 4...Switching element, 5...Control circuit, 6...Auxiliary power supply circuit, 6
01...Diode, 602...Resistor, 603...Capacitor, 604...Switching element, 605...Capacitor, 7...Output circuit.

Claims

[Claims for Utility Model Registration] (1) A transformer, a switching element that switches a DC input provided through an input winding of the transformer, and a switching element that is connected to the output winding of the transformer and switches a switching output to a DC input. a control circuit for controlling the switching element; and an auxiliary power supply circuit that includes a winding provided in the transformer and supplies operating power to the control circuit. In the power source, the auxiliary power circuit includes a time constant circuit that is charged in one direction by the voltage generated in the winding of the transformer, and a time constant circuit that is connected in series to the winding of the transformer and that is charged in one direction by the voltage generated in the winding of the transformer. A switching power supply comprising: a switching element that turns on and off based on a charging voltage of a constant circuit; and a capacitor that smooths the output of the switching element and supplies an auxiliary power supply voltage to the control circuit. (2) The time constant circuit has a time constant that is longer than the cascade time of the spike voltage component included in the voltage generated in the winding of the transformer. The switching power supply described in item 1.