发明名称 |
Capacitor discharging method and discharging circuit thereof |
摘要 |
In one embodiment, a method of controlling a capacitor discharge for a switching power supply, can include: (i) generating a first voltage signal from a voltage at an X capacitor that is coupled between input terminals of the switching power supply; (ii) activating a detection signal in response to the first voltage signal being inactive for a duration of a predetermined time interval, where the detection signal being activated indicates a cut-off of the input terminals; and (iii) at least partially discharging the X capacitor after the cut-off and in response to activation of the detection signal. |
申请公布号 |
US9419511(B2) |
申请公布日期 |
2016.08.16 |
申请号 |
US201414243719 |
申请日期 |
2014.04.02 |
申请人 |
Silergy Semiconductor Technology (Hangzhou) LTD |
发明人 |
Huang Qiukai;Han Yunlong;Xu Xiaoru |
分类号 |
H02M1/32;H02M3/335 |
主分类号 |
H02M1/32 |
代理机构 |
|
代理人 |
Stephens, Jr. Michael C. |
主权项 |
1. A method of controlling a capacitor discharge for a switching power supply, the method comprising:
a) generating a first voltage signal from a voltage at an X capacitor that is coupled between input terminals of said switching power supply, wherein said generating said first voltage signal comprises differentiating said voltage at said X capacitor to generate a differential signal, clamping said differential signal between an upper limit and a lower limit to generate a clamping signal, and converting said clamping signal to generate said first voltage signal; b) activating a detection signal in response to said first voltage signal being inactive for a duration of a predetermined time interval, wherein said detection signal being activated indicates a cut-off of said input terminals; and c) at least partially discharging the X capacitor after the cut-off and in response to activation of the detection signal. |
地址 |
Hangzhou CN |