Power supply with dual conversion circuits and discharge path for output capacitors

A control system comprising:

• a first power supply comprising:
• a first input terminal configured to receive a first AC power;
• a first conversion circuit converting the first AC power to a first DC power;
• a first output capacitor configured to store the first DC power;
• a first discharge circuit creating a first discharge path to discharge the first output capacitor in response to the first DC power being greater than a second DC power;
• and a first output terminal configured to output the first DC power;
• a second power supply comprising:
• a second input terminal configured to receive a second AC power;
• a second conversion circuit converting the second AC power to the second DC power;
• a second output capacitor configured to store the second DC power;
• a second discharge circuit creating a second discharge path to discharge the second output capacitor in response to the second DC power being greater than the first DC power;
• and a second output terminal configured to output the second DC power;
• and a system load comprising:
• a first interface comprising:
• a first power-receiving terminal;
• and a first connection terminal, wherein in response to the first output terminal being coupled to the first interface, the first power-receiving terminal receives the first DC power and the first connection terminal is connected to the first discharge circuit;
• and a second interface comprising:
• a second power-receiving terminal electrically connected to the first power-receiving terminal;
• and a second connection terminal electrically connected to the first connection terminal, wherein in response to the second output terminal being coupled to the second interface, the second power-receiving terminal receives the second DC power and the second connection terminal is connected to the second discharge circuit, Wherein:
• the first conversion circuit comprises:
• an AC-DC converter converting the first AC power to a first voltage;
• a boost circuit processing the first voltage to generate a second voltage;
• a buck circuit processing the second voltage to generate the first DC power;
• and a feedback compensation circuit generating a feedback signal according to the first DC power, wherein the buck circuit adjusts the first DC power according to the feedback signal, the buck circuit comprises:
• a first pulse-width modulation (PWM) circuit generating a first switching signal and a second switching signal according to the feedback signal;
• a first switch receiving the first switching signal and coupled between a first node and a second node;
• a second switch receiving the second switching signal and coupled between the second node and the ground terminal;
• a resonant circuit coupled between the second node and the ground terminal to generate a resonant voltage;
• and a transformer generating the first DC power according to the resonant voltage.