Patent ID: 8937792
Filing Date: 2015-01-20
Classification: H02H

Abstract:
1. A buck circuit, comprising: a first inductor, a second inductor, a first capacitor, a second capacitor, a first resistor, a second resistor, a voltage input terminal, and a voltage output terminal; a first electronic switch comprising: a second electronic switch comprising a first terminal connected to the second terminal of the first electronic switch, a second terminal grounded, and a third terminal; and a controller comprising: wherein relationship of capacitance C of the first capacitor, resistance R of the first resistor, inductance L of the first inductor, and equivalent impedance Z of the first inductor is R*C=L/Z; and wherein the controller detects voltage of the first capacitor through the first detecting pin and the second detecting pin, determines whether current of the first inductor is more than a preset value according to the voltage of the first capacitor, and executes over-current protection in response to the current of the first inductor being more than the preset value.