Power supply circuit with stand-by control circuit and energy storage circuit

A power supply circuit configured for supplying power for a load, comprising:

• a main power supply configured to convert a received voltage into a required direct current voltage;
• a microprocessor;
• a stand-by control circuit configured to control the main power supply;
• a stand-by pilot circuit configured to receive the voltage outputted from the main power supply and display operation conditions of the main power supply, the stand-by pilot circuit comprising a capacitor, a first transistor, a second transistor, a light emitting diode, and a zener diode, an emitter of the first transistor connected to the voltage conversion circuit, a collector of the first transistor connected to an anode of the light emitting diode, a cathode of the light emitting diode connected to ground, a base of the first transistor connected to the main power supply, the base of the first transistor connected to the emitter of the first transistor via a resistor, a collector of the second transistor connected to the base of the first transistor via a resistor, an emitter of the second transistor connected to ground, a base of the second transistor connected to an anode of the zener diode, a cathode of the zener diode connected to the emitter of the first transistor, the capacitor connected between the emitter of the first transistor and ground;
• an energy storage circuit configured for supplying power for the stand-by control circuit;
• a voltage conversion circuit connected to the energy storage circuit and the first plate of the capacitor of the stand-by pilot circuit, and the voltage conversion circuit configured to convert a received alternate voltage into a direct current voltage and supply the direct current voltage to the energy storage circuit and the stand-by pilot circuit;
• wherein in response to when the load stops operating, the microprocessor outputs a switch-off signal to the stand-by control circuit, the stand-by control circuit outputs a first control signal to turn off the main power supply;
• and in response to when the load starts to operate, the stand-by control circuit correspondingly outputs a second control signal to turn on the main power supply, and the main power supply charges the energy storage circuit.

A power supply circuit configured for supplying power for a load, comprising:

• a main power supply configured for converting a received voltage into a required direct current voltage;
• a commutating and filter circuit configured for converting external alternate current (AC) voltages into direct current (DC) voltages and supplying the DC voltages for the main power supply;
• a microprocessor;
• a stand-by control circuit configured for controlling the main power supply, wherein the stand-by control circuit comprises a switch comprising a first terminal and a second terminal, a trigger, a transistor, an optical coupler, and a reverser;
• the first terminal of the switch is connected to the trigger, the second terminal of the switch is connected to ground;
• a control electrode of the transistor is connected to the trigger, a first terminal of the transistor is connected to the trigger, a second terminal of the transistor is connected to the optical coupler;
• the reverser is connected to the optical coupler;
• an energy storage circuit configured for supplying power for the stand-by control circuit;
• wherein the main power supply comprises a transformer configured for converting the DC voltages into AC voltages;
• a transistor configured for switching on or switching off the main power supply, a switch control circuit configured for turning on or turning off the transistor, and a feedback circuit configured for feeding back the voltages outputted from the transformer to the switch control circuit;
• wherein in response to when the load stops operating, the microprocessor outputs a control signal to the stand-by control circuit, the stand-by control circuit outputs a corresponding control signal to turn off the main power supply;
• and in response to when the load starts to operate, the stand-by control circuit outputs a corresponding control signal to turn on the main power supply, and the main power supply charges the energy storage circuit.