Invention Grant
- Patent Title: Current feedback method, current feedback circuit, driving circuit and switching power supply thereof
- Patent Title (中): 电流反馈方式，电流反馈电路，驱动电路及开关电源
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Application No.: US14525974Application Date: 2014-10-28
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Publication No.: US09246384B2Publication Date: 2016-01-26
- Inventor: Guojia Liu , Wei Chen
- Applicant: Silergy Semiconductor Technology (Hangzhou) LTD
- Applicant Address: CN Hangzhou
- Assignee: Silergy Semiconductor Technology (Hangzhou) LTD
- Current Assignee: Silergy Semiconductor Technology (Hangzhou) LTD
- Current Assignee Address: CN Hangzhou
- Agent Michael C. Stephens, Jr.
- Priority: CN201310533046 20131031
- Main IPC: H02M3/156
- IPC: H02M3/156 ; H03K7/08 ; H02M1/00
Abstract:
In one embodiment, a current feedback circuit can include: (i) a first current mirror circuit having an input terminal coupled to a source of a main power transistor of a switching power supply, and a control terminal configured to receive a PWM control signal, the first current mirror circuit being configured to generate a first mirror current; (ii) the first current mirror circuit and the main power transistor being on such that an output sampling current flows through the first current mirror circuit and the main power transistor when the PWM control signal is active; and (iii) a second current mirror circuit configured to generate an output feedback current that is in a predetermined direct proportion with the output sampling current, and is generated in accordance with the first mirror current.
Public/Granted literature
- US20150115922A1 CURRENT FEEDBACK METHOD, CURRENT FEEDBACK CIRCUIT, DRIVING CIRCUIT AND SWITCHING POWER SUPPLY THEREOF Public/Granted day:2015-04-30
Information query
IPC分类:
