阅读说明：本技术 电源控制电路及图像形成装置 (Power supply control circuit and image forming apparatus ) 是由 覃祖料 梁杰 晏丹丹 黄香川 黄超豪 胡智敏 于 2020-06-19 设计创作，主要内容包括：本申请公开了一种电源控制电路和图像形成装置,该电源控制电路包括电源电路和自动关机控制电路,所述电源电路用于为电子装置提供电能,并在符合预定条件时,输出自动关机控制信号,其中,电源电路包括电压转换器,所述自动关机控制电路用于接收电源电路输出的自动关机控制信号,并在接收到所述电源电路输出的自动关机控制信号时,输出电压信号至所述电压转换器的使能端,控制所述电源电路停止提供电能到所述电子装置,使所述电子装置停止工作,进而实现了所述电子装置的自动关机功能,提升了用户的体验感。(The application discloses power control circuit and image forming device, this power control circuit include power supply circuit and automatic shutdown control circuit, power supply circuit is used for providing the electric energy for electronic device to when according with the predetermined condition, output automatic shutdown control signal, wherein, power supply circuit includes voltage converter, automatic shutdown control circuit is used for receiving the automatic shutdown control signal of power supply circuit output, and is receiving during the automatic shutdown control signal of power supply circuit output, output voltage signal extremely voltage converter's messenger end, control power supply circuit stops to provide the electric energy to electronic device makes electronic device stop work, and then has realized electronic device's automatic shutdown function has promoted user's experience sense.)

1. A power control circuit for an electronic device, comprising:

the power supply circuit is used for providing electric energy for the electronic device and outputting an automatic shutdown control signal when a preset condition is met, wherein the power supply circuit comprises a voltage converter;

and the automatic shutdown control circuit is used for receiving the automatic shutdown control signal output by the power circuit, outputting a voltage signal to the enabling end of the voltage converter when receiving the automatic shutdown control signal output by the power circuit, and controlling the power circuit to stop supplying electric energy to the electronic device.

2. The power control circuit according to claim 1, wherein the automatic shutdown control circuit comprises a shutdown locking module, a shutdown triggering module and a startup locking module, the shutdown triggering module is connected to the power circuit, the shutdown triggering module is connected to the shutdown locking module via the startup locking module, and the shutdown locking module is connected to the voltage converter;

when the shutdown trigger module receives an automatic shutdown control signal output by the power circuit, the shutdown trigger module controls the switching device in the startup locking module to be switched off, so that the switching device in the shutdown locking module is switched on, and the shutdown locking module outputs a preset level to the enabling end of the voltage converter, so that the voltage converter stops working.

3. The power control circuit according to claim 2, wherein the shutdown locking module comprises a first transistor, the startup locking module comprises a triode, the shutdown triggering module comprises a second transistor, a gate of the second transistor is connected to the output terminal of the automatic shutdown control signal of the power circuit, a drain of the second transistor is connected to a gate of the first transistor through the triode, and a drain of the first transistor is connected to the enable terminal of the voltage converter;

when the power circuit outputs an automatic shutdown control signal, the second transistor is conducted, the triode is cut off, and the first transistor is conducted, so that an input signal of an enabling end of the voltage converter is at a preset level.

4. The power control circuit according to claim 3, wherein the shutdown locking module further includes a first capacitor, a first resistor, and a second resistor, a gate of the first transistor is connected to the first voltage output by the power circuit through the first resistor, a base of the transistor is connected to a drain of the second transistor and is configured to receive the second voltage output by the voltage converter, a collector of the transistor is connected to the gate of the first transistor, one end of the first capacitor and one end of the second resistor are respectively connected to the gate of the first transistor, and the other end of the first capacitor and the other end of the second resistor are respectively connected to ground;

when the power circuit outputs an automatic shutdown control signal, the second transistor is conducted, the triode is cut off, the shutdown locking module receives first voltage input to enable the first capacitor to be charged, and when the voltage of the first capacitor reaches the threshold value of the starting voltage of the first transistor, the first transistor is conducted to enable the enabling end of the voltage converter to input a preset level.

5. The power control circuit according to claim 3, wherein the shutdown trigger module further comprises a second capacitor, a first diode and a seventh resistor, a gate of the second transistor is connected to the output terminal of the automatic shutdown control signal of the power circuit through the seventh resistor and the first diode, and one end of the second capacitor is connected to the gate of the second transistor;

when the power circuit outputs an automatic shutdown control signal, the automatic shutdown control signal charges the second capacitor through the first diode and the seventh resistor, and when the voltage of the second capacitor reaches the threshold of the starting voltage of the second transistor, the second transistor is conducted, so that the triode is cut off.

6. The power supply control circuit according to claim 5, wherein the shutdown trigger module further includes a sixth resistor, and two ends of the sixth resistor are respectively connected to the gate of the second transistor and the second capacitor, and are configured to limit a charging current of the gate of the second transistor.

7. The power control circuit of claim 1, wherein the auto-off control circuit further comprises a fast restart module, the fast restart module being coupled to the shutdown lock module.

8. The power control circuit of claim 7, wherein the fast restart module comprises a zener diode, a cathode of the zener diode is connected to the first voltage output by the power circuit, and an anode of the zener diode is connected to the shutdown locking module.

9. The power control circuit according to claim 1, wherein the power conversion circuit comprises an AC-DC conversion circuit, a DC-DC conversion circuit and a main control circuit, and the DC-DC conversion circuit is connected to the AC-DC conversion circuit and the main control circuit respectively;

the AC-DC conversion circuit is used for converting commercial power into first voltage and outputting the first voltage, the DC-DC conversion circuit is used for converting the first voltage output by the AC-DC conversion circuit into second voltage and outputting the second voltage to the main control circuit, and the main control circuit is used for controlling the work of the electronic device and outputting an automatic shutdown control signal when a preset condition is met; wherein the DC-DC conversion circuit includes the voltage converter.

10. An image forming apparatus comprising the power supply control circuit according to any one of claims 1 to 9.