发明名称 |
Control circuit and method for protecting a piezoelectric transformer from an open state and a short-circuited state |
摘要 |
In a piezoelectric transformer control circuit, when a load (2) is disconnected from a piezoelectric transformer (1) and changes to an open state, an output detection voltage (Vdet) becomes higher than a reference voltage (Vref2), and the output from a voltage comparator (10a) goes "Low". When the output of the piezoelectric transformer (1) is short-circuited to GND, the output detection voltage (Vdet) abruptly drops to almost "0" and becomes lower than a reference voltage (Vref3). The output from a voltage comparator (10b) goes "Low". A voltage-controlled oscillation circuit (6) detects the signal "Low" to stop the generation of the oscillation signal to a driving circuit (7) for driving the piezoelectric transformer (1).
|
申请公布号 |
US6486612(B2) |
申请公布日期 |
2002.11.26 |
申请号 |
US19990423902 |
申请日期 |
1999.11.16 |
申请人 |
TAIHEIYO CEMENT CORPORATION |
发明人 |
FUJIMURA TAKESHI;ISHIKAWA KATSUYUKI;TOYAMA MASAAKI |
分类号 |
H01L41/107;H01L41/04;H02M11/00;H05B41/285;(IPC1-7):H05B37/02 |
主分类号 |
H01L41/107 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|