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发明授权
CN1677822B 降压型DC-DC变流器 失效 - 权利终止

降压型DC-DC变流器
摘要：
本发明提供一种降压型DC-DC变流器。不用设置高于输入电压的特别的电压电路，而使用N沟道型MOS晶体管构成具有良好特性的DC-DC变流器。在直流电源的负极侧和输出用电容器(8)的负极侧之间，串联连接N沟道型MOS晶体管(11)和扼流线圈(12)。具有根据电阻(9、10)对输入电压的分压向MOS晶体管(11)的栅极施加脉冲信号的PWM电路(14)。在直流电源的正极侧和负极侧之间提供向MOS晶体管(11)的栅极施加脉冲信号的电源。PWM电路(14)的脉冲信号是由与输出用电容器(8)的输出电压对应的电压形成的，通过光电耦合器(16)将该脉冲信号输入到N沟道型MOS晶体管(11)的栅极上。
摘要（英）：

The invention constitutes a DC-DC converter having good characteristics using an N channel MOS transistor without providing a special voltage circuit having a voltage higher than the input voltage. An N channel MOS transistor 11 and a choke coil 12 are connected in series between the minus side of a DC power supply and the minus side of an output capacitor 8. A PWM circuit 14 for applying a pulsesignal to the gate of the MOS transistor 11 based on an input voltage divided by resistors 9 and 10 is provided. Power of the pulse signal being applied to the gate of the MOS transistor 11 is supplied between the plus side and minus side of the DC power supply. Pulse signal of the PWM circuit 14 is formed by a voltage corresponding to the output voltage from the output capacitor 8 and inputted to the gate of the MOS transistor 11 through a photocoupler 16.

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