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    • 7. 发明授权
    • Control circuit and method for self-exciting capacitor charging circuit
    • 自励电容充电电路的控制电路及方法
    • US07952299B2
    • 2011-05-31
    • US12248279
    • 2008-10-09
    • Tatsuya Iwasaki
    • Tatsuya Iwasaki
    • H05B37/00
    • H02M3/33507H02M1/36
    • A first voltage comparator makes a comparison between a first detection voltage that occurs at one terminal of a first resistor and a predetermined first threshold voltage. A second voltage comparator compares a second detection voltage that occurs at one terminal of a second resistor with a predetermined second threshold voltage. A logic unit generates a switching signal, the level of which is switched according to the output signals of the first voltage comparator and the second voltage comparator, and outputs the switching signal thus generated to the gate of a switching transistor. After a predetermined period of time elapses after the switching signal is switched to the level which turns off the switching transistor, an automatic restart circuit forcibly switches the switching signal to a level which switches the switching transistor to the ON state.
    • 第一电压比较器比较在第一电阻器的一个端子处发生的第一检测电压和预定的第一阈值电压之间的比较。 第二电压比较器将在第二电阻器的一个端子处发生的第二检测电压与预定的第二阈值电压进行比较。 逻辑单元产生切换信号,其电平根据第一电压比较器和第二电压比较器的输出信号而被切换,并将所产生的切换信号输出到开关晶体管的栅极。 在切换信号切换到关闭开关晶体管的电平经过预定时间段之后,自动重启电路将开关信号强制切换到将开关晶体管切换到接通状态的电平。