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    • 106. 发明授权
    • Switching power supply device
    • 开关电源装置
    • US09397575B2
    • 2016-07-19
    • US14176405
    • 2014-02-10
    • Murata Manufacturing Co., Ltd.
    • Tatsuya Hosotani
    • H02M3/335H02M3/338
    • H02M3/33507H02M3/33569H02M3/3385
    • In a switching power supply device, a voltage of a counter electromotive force induced in a drive winding as a high side switching element is turned off is output to a ZT terminal of a switching control IC, and thus an OUT terminal of the switching control IC is brought to a high level, and thus a low side switching element is turned on. A constant current circuit charges a capacitor with a constant current through a voltage at the OUT terminal. A comparator in the switching control IC inverts the voltage at the OUT terminal to a low level upon a voltage at an IS terminal exceeding a voltage at an FB terminal. Thus, an on time of the low side switching element is controlled in accordance with a voltage output to the FB terminal, and an output voltage Vo is turned into a constant voltage.
    • 在开关电源装置中,在作为高侧开关元件的驱动绕组中感应出的反电动势的电压被截止,输出到开关控制IC的ZT端,因此切换控制IC的OUT端 被带到高电平,因此低侧开关元件导通。 恒流电路通过OUT端的电压以恒定电流对电容器充电。 开关控制IC中的比较器在IS端子处的电压超过FB端子处的电压时将OUT端子处的电压反相到低电平。 因此,根据向FB端子输出的电压来控制低侧开关元件的导通时间,并且输出电压Vo变为恒定电压。