公开(公告)号：EP1387475A1

公开(公告)日：2004-02-04

申请号：EP02425506.9

申请日：2002-08-01

Applicant: STMicroelectronics S.r.l.

Inventor： Pidutti, Albino ,  Beria, Stefano

IPC: H02M1/12 ,  H02M3/156

CPC classification number: H02M1/4225 ,  Y02B70/126 ,  Y02P80/112

Abstract: The present invention refers to a switching power supply, in particular to a power factor corrector (PFC), and more particularly to a circuit for the programmable protection of output overvoltages. It also refers to a power factor corrector integrated circuit comprising a circuit for the programmable protection of output overvoltages.
In one embodiment the circuit for the programmable protection of output overvoltages in a power factor corrector comprises means (R1, R2) for detecting a signal proportional to the output voltage; a first preset reference voltage (Vref1); a second preset reference voltage (Vref2); a transconductance amplifier (18) which receives in input said signal proportional to the output voltage and said first preset reference voltage (Vref1); a comparator (21) which receives in input said signal proportional to the output voltage and said second preset reference voltage (Vref2); means (Rint) suitable for absorbing a current coming from said signal proportional to the output voltage.

Abstract translation: 本发明涉及一种开关电源，特别是功率因数校正器（PFC）的开关电源，更具体地说，涉及用于可编程保护输出过电压的电路。 它还涉及功率因数校正器集成电路，其包括用于可编程保护输出过电压的电路。 在一个实施例中，功率因数校正器中用于可编程保护输出过电压的电路包括用于检测与输出电压成比例的信号的装置（R1，R2） 第一预设参考电压（Vref1）; 第二预设参考电压（Vref2）; 跨导放大器（18），其在输入端接收与输出电压成比例的信号和所述第一预置参考电压（Vref1）; 比较器（21），其在输入端接收与所述输出电压和所述第二预置参考电压（Vref2）成比例的所述信号; 适用于吸收来自与输出电压成正比的信号的电流（Rint）。