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    • 3. 发明申请
    • POWER SUPPLY APPARATUS
    • 电源设备
    • US20120294046A1
    • 2012-11-22
    • US13475138
    • 2012-05-18
    • Satoru NATEHiroshi HAYASHI
    • Satoru NATEHiroshi HAYASHI
    • H02M3/335
    • H02M1/42H02J9/005H02M1/4225H02M3/33507H02M3/33569H02M2001/0032H02M2001/007Y02B70/126Y02B70/16
    • A second control circuit is configured to switch a pulse signal to a level which turns off a second switching transistor when a coil current that flows through a primary winding reaches a predetermined threshold current. The second control circuit is configured to start a switching operation when a power supply for an electronic device is turned on, to set the threshold current to a first value when an intermediate voltage is higher than a predetermined level, and to set the threshold current to a second value that is lower than the first value when the intermediate voltage is lower than a predetermined level. A first control circuit is configured to start a switching operation upon receiving an instruction from a microcontroller to start operating.
    • 第二控制电路被配置为当流过初级绕组的线圈电流达到预定阈值电流时,将脉冲信号切换到关闭第二开关晶体管的电平。 第二控制电路被配置为当电子设备的电源接通时开始切换操作,当中间电压高于预定电平时将阈值电流设置为第一值,并将阈值电流设置为 当所述中间电压低于预定电平时,所述第二值低于所述第一值。 第一控制电路被配置为在从微控制器接收到开始操作的指令时开始切换操作。