Patent ID: 11901885
Assignee: REALTEK SEMICONDUCTOR CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A pulse width modulation-based (PWM-based) overcurrent protection circuit, comprising:
a pulse-width-modulation circuit, connected to a charge pump and a load-detection circuit, wherein both the charge pump and the load-detection circuit are connected to a power-switch circuit; wherein the charge pump outputs a voltage to the power-switch circuit according to a clock-voltage signal; wherein the load-detection circuit detects an overcurrent flowing through the power-switch circuit according to a load at an output end of the power-switch circuit;
wherein, when the load-detection circuit detects the overcurrent, the load-detection circuit generates an overcurrent protection voltage and the pulse-width-modulation circuit dynamically adjusts the clock-voltage signal according to the overcurrent protection voltage and dynamically controls a duty-cycle width of the voltage outputted by the charge pump, so as to suppress the voltage outputted to the power-switch circuit by the charge pump, and accordingly correct an output voltage from the power-switch circuit.