公开(公告)号：WO2002078161A1

公开(公告)日：2002-10-03

申请号：PCT/IB2002/000848

申请日：2002-03-22

Applicant: KONINKLIJKE PHILIPS ELECTRONICS N.V.

Inventor： SABATE, Juan, A. ,  BRUNING, Gert, W.

IPC: H02M3/338

CPC classification number: H02M1/44 ,  H02M3/33592 ,  H02M3/3376 ,  H02M2001/0022 ,  H02M2001/0058 ,  Y02B70/1433 ,  Y02B70/1475 ,  Y02B70/1491

Abstract: A switching power supply is provided in two stages with the primary of the power transformer (18) being in the first stage and the secondary in the second stage. The first stage (Stage 1) includes an EMI filter (12) connected to the input of a rectifier (14). The output of the rectifier is connected to a self oscillating, half-bridge, resonant inverter (16) operating in open loop with the primary of the transformer (18) to provide isolation from the power source (10). Feed-forward control is used to compensate for line variations, providing very small output voltage variation compared with input voltage variation. In the second stage (Stage 2), the secondary of the transformer (18) provides an input to post regulator circuitry (20) including a PWM control circuit (34) to regulate the output current using the error signal representing the differences between the current sensed and the desired value.

Abstract translation: 开关电源分两级设置，电源变压器（18）的主电源处于第一级，次级在第二级。 第一级（阶段1）包括连接到整流器（14）的输入端的EMI滤波器（12）。 整流器的输出连接到与变压器（18）的初级工作在开环中的自振荡半桥谐振逆变器（16），以提供与电源（10）的隔离。 前馈控制用于补偿线路变化，与输入电压变化相比，提供非常小的输出电压变化。 在第二阶段（阶段2）中，变压器（18）的次级提供一个输入到后稳压器电路（20），包括一个PWM控制电路（34），以使用表示电流之间的差异的误差信号来调节输出电流 感测和期望值。