KR940015746A

KR940015746A - Synchronization circuit at turn-on of switching element of power supply for notebook personal computer

Info

Publication number: KR940015746A
Application number: KR1019920025348A
Authority: KR
Inventors: 임성호
Original assignee: 황선두; 삼성전기 주식회사
Priority date: 1992-12-24
Filing date: 1992-12-24
Publication date: 1994-07-21

Abstract

이 발명은 노트북 퍼스널 컴퓨터용 전원공급장치에 관한 것으로서, 종래에는 컨버터 설계시 스위칭 소자를 두개를 이용해 병렬로 운용할때 두 스위칭 소자의 오프시 소자간의 적은 오차로 인해 전압 불균형이 일어나는 것을 막기위해 스너버 회로의 콘덴서를 용량이 큰 것으로 사용하여야 하는 문제점이 있으므로 종래 스너버 회로의 콘덴서가 스위칭 소자인 트랜지스터의 소오스에 연결된 것을 트랜지스터의 게이트에 연결시킴으로써 같은 용량의 콘덴서에 대해 전류 이득 만큼의 더 큰 용량을 얻을 수 있으므로 콘덴서를 소오스에 연결하는 것보다 게이트에 연결하면 작은 콘덴서를 사용하므로 소형화가 가능한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply for a notebook personal computer. In the prior art, when a converter is designed using two switching elements in parallel, a voltage error is prevented due to a small error between the two switching elements when the switching elements are turned off. Since there is a problem that the capacitor of the nubber circuit should be used with a large capacity, the capacitor of the conventional snubber circuit is connected to the source of the transistor, which is a switching element, by connecting the gate of the transistor to a larger capacity as much as the current gain for the capacitor of the same capacity. Since a capacitor can be connected to a gate rather than a source, a small capacitor can be used to reduce the size of the capacitor.

Description

Synchronization circuit at turn-on of switching element of power supply for notebook personal computer

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제2도는 이 발명에 따른 노트북 퍼스널 컴퓨터용 전원공급장치의 스위칭 소자의 턴온시 동기화 회로의 일실실예를 나타내는 회로도이다.2 is a circuit diagram showing one embodiment of a synchronization circuit at turn-on of a switching element of a power supply for a notebook personal computer according to the present invention.

Claims

Transistor Q1, which is a switching element, a snubber circuit 10 connected between the drain and gate of the transistor Q1 and preventing an overvoltage, and transistor Q2, which is a switching element connected to a source of the transistor Q1. And a snubber circuit (20) connected between the drain and the source of the transistor (Q2) and configured to prevent overvoltage.

2. The circuit of claim 1, wherein the transistor (Q1) comprises a MOS field effect transistor.

2. The synchronization circuit of claim 1, wherein the transistor (Q2) comprises a MOS field effect transistor.

The capacitor (10) of claim 1, wherein the snubber circuit (10) has a capacitor (R1) and a diode (D1) connected in parallel to a train of the transistor (Q1) and connected to the resistor (R1) and a diode (D1). C1) is connected to the gate of transistor Q1 so that the capacitance of the capacitor is larger than the current gain, the synchronization circuit on turn-on of the switching element of the power supply for a notebook personal computer.

The snubber circuit 20 of claim 1, wherein a drain of the transistor Q2 is connected to a source of the transistor Q1, and a resistor R2 and a diode D2 are connected to a train of the transistor Q2. The capacitor C2 connected in parallel and connected to the resistor R2 and the diode D2 is connected to the gate of the transistor Q2 so that the capacity of the capacitor becomes larger by the current gain. Synchronization circuit on turn-on of the switching elements of the power supply.

※ Note: The disclosure is based on the initial application.