Buck circuit

Patent metadata

Field	Value
Publication number	US-8937792-B2
Application number	US-201313787854-A
Country	US
Kind code	B2
Filing date	Mar 7, 2013
Priority date	Mar 19, 2012
Publication date	Jan 20, 2015
Grant date	Jan 20, 2015

Abstract

A buck circuit includes a first inductor, a second inductor, a first capacitor, a second capacitor, a first resistor, a second resistor, a first electronic switch, a second electronic switch, a controller, a voltage input terminal, and a voltage output terminal. The relationship of the capacitance C of the first capacitor, the resistance R of the first resistor, the inductance L of the first inductor, and the equivalent impedance Z of the first inductor is R*C=L/Z. The controller detects voltage of the first capacitor, 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 when the current of the first inductor is more than the preset value.

First claim

What is claimed is:

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 first terminal connected to the voltage input terminal through the first inductor, and connected to the voltage input terminal through the first capacitor and the first resistor in that order;
a second terminal connecte…

Assignees

• Hongfujin Prec Ind Shenzhen
• Hon Hai Prec Ind Co Ltd

Inventors

• Li ji-chao

Classifications

• H02H9/025 Primary

  Electricity · mapped topic