| 主权项 |
1. A power supply circuit to supply power to an electronic element, the power supply circuit comprising a voltage conversion unit comprising an output terminal connected to the electronic element, and a voltage clamping unit comprising:
a first resistor; a second resistor; a first inductor; a comparator comprising a non-inverting terminal connected to a reference voltage, an inverting terminal connected to the output terminal of the voltage conversion unit through the first resistor and grounded through the second resistor, and an output terminal; a first electronic switch comprising a first terminal connected to the output terminal of the comparator, a second terminal grounded, and a third terminal connected to the output terminal of the voltage conversion unit through the first inductor; and a diode comprising an anode connected to the third terminal of the first electronic switch, and a cathode connected to the output terminal of the voltage conversion unit;wherein in response to a voltage of the output terminal of the voltage conversion unit being more than an operation voltage of the electronic element, a voltage of the inverting terminal of the comparator is more than the reference voltage, the output terminal of the comparator outputs a low level signal, the first electronic switch is turned on, the first inductor is grounded through the first electronic switch to pull down the voltage of the output terminal of the voltage conversion unit, and the first inductor is charged by the voltage of the output terminal of the voltage conversion unit; in response to the voltage of the output terminal of the voltage conversion unit being pulled down to the operation voltage of the electronic element, the voltage of the inverting terminal of the comparator is less than the reference voltage, the output terminal of the comparator outputs a high level signal, the first electronic switch is turned off, and the first inductor is discharged through the diode. |
