KR970077925A

KR970077925A - The power supply circuit of the switching mode power supply

Info

Publication number: KR970077925A
Application number: KR1019960015200A
Authority: KR
Inventors: 심재규
Original assignee: 김광호; 삼성전자 주식회사
Priority date: 1996-05-09
Filing date: 1996-05-09
Publication date: 1997-12-12

Abstract

본 발명은 전원 스위치를 온하는 초기에 PWM용 집적소자에 안정된 초기 동작전원을 공급하는 것이다.The present invention supplies stable initial operating power to the integrated circuit for PWM at the initial stage of turning on the power switch.

본 발명은 전원 스위치를 온함에 따라 공급되는 교류전원으로 PWM 집적 소자에 직접 동작전원을 공급하는 것으로서, 교류전원을 정류하고, 이를 평활한 후 PWM 집적소자의 전원단자에 공급함으로써 별도로 전력 용량이 높은 고가의 저항 사용할 필요가 없음은 물론 발생되는 열이 매우 적어 주변 부품의 동작에 아무런 영향도 주지 않고, 안정되게 동작한다.The present invention is to supply the operating power directly to the PWM integrated device with the AC power supplied when the power switch is turned on. By rectifying the AC power, smoothing the AC power, and supplying it to the power terminal of the PWM integrated device, It is not necessary to use an expensive resistor, and the generated heat is very small, so that it does not affect the operation of peripheral components and operates stably.

Description

The power supply circuit of the switching mode power supply

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is a trivial issue, I did not include the contents of the text.

제 1 도는 종래의 기동전원 공급회로가 구성된 스위칭 모드 전원공급장치의 구성을 보인 회로도, 제 2 도는 본 발명의 기동전원 공급회로가 구성된 스위칭 모드 전원공급장치의 구성을 보인 회로도.FIG. 1 is a circuit diagram showing a configuration of a switching mode power supply device in which a conventional activated power supply circuit is configured; FIG. 2 is a circuit diagram showing a configuration of a switching mode power supply device configured with a startup power supply circuit according to the present invention;

Claims

AC power (AC ₁₁₎ of the DC power converter 11 that converts the direct-current power supply to output a switching power supply for integrated for PWM oscillating to generate a PWM signal device 12 and the integrated element (12 for the PWM ) is an on and an output power of as being off the switching transistor (Q _11), the switching transistor (Q ₁₁₎ oN, and the DC power converter 11 in accordance with the off according to the output PWM signal to the primary coil (TA ₁₁ ) action on the secondary coil (TA ₁₂₎ and secondary coil (TA _13), a switching transistor (SWT ₁₁₎ and said auxiliary coil (TA _13), the integrated device (12 to rectify the power for the PWM guided to) that led to the in A level detection unit 14 for detecting an output power level of the operation power supply unit 13 and a control unit 14 for controlling the PWM (SCR < RTI ID = 0.0 > _{11 < /} RTI > And an initial operating power supply unit (15) for rectifying and smoothing the AC power source ( ₁₁ ) and supplying initial operating power to the PWM integrated device (12). The switching power source Supply circuit.

The starting power supply circuit according to claim 1, wherein the initial operating power supply unit (15) comprises a smoothing unit including a rectifying unit and a small capacity condenser (C ₁₃ ).

※ Note: It is disclosed by the contents of the first application.