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SYSTEM, METHOD AND APPARATUS OF TRANSITION BETWEEN PULSE-WIDTH MODULATION AND PULSE-FREQUENCY MODULATION IN A SWITCH MODE POWER SUPPLY
SYSTEM, METHOD AND APPARATUS OF TRANSITION BETWEEN PULSE-WIDTH MODULATION AND PULSE-FREQUENCY MODULATION IN A SWITCH MODE POWER SUPPLY
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机译:开关电源中脉冲宽度调制和脉冲频率调制之间转换的系统,方法和装置
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摘要
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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