Invention Grant
US08427123B2 System, method and apparatus to transition between pulse width modulation and pulse-frequency modulation in a switch mode power supply
有权
在开关模式电源中脉冲宽度调制与脉冲频率调制之间转换的系统，方法和装置
- Patent Title: System, method and apparatus to transition between pulse width modulation and pulse-frequency modulation in a switch mode power supply
- Patent Title (中): 在开关模式电源中脉冲宽度调制与脉冲频率调制之间转换的系统，方法和装置
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Application No.: US12787066Application Date: 2010-05-25
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Publication No.: US08427123B2Publication Date: 2013-04-23
- Inventor: Scott C. Dearborn
- Applicant: Scott C. Dearborn
- Applicant Address: US AZ Chandler
- Assignee: Microchip Technology Incorporated
- Current Assignee: Microchip Technology Incorporated
- Current Assignee Address: US AZ Chandler
- Agency: King & Spalding L.L.P.
- Main IPC: G05F1/00
- IPC: G05F1/00
Abstract:
A switch mode power supply (SMPS) has optimized efficiency over an entire operating range, from no load to full load, by transitioning between pulse frequency modulation (PFM) and pulse width modulation (PWM) for control of the SMPS depending upon load current. Accurate, smooth, and seamless transitions between PFM and PWM modes of operation occur at a preset load current(s). PFM operation improves efficiency during light load conditions, and PWM has better efficiency at higher load currents. This is advantageous in battery powered applications, and thereby results in a longer time before battery replacement or recharge is necessary.
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