发明名称 |
Method and apparatus to reduce audio frequencies in a switching power supply |
摘要 |
A controller for use in a power supply regulator is disclosed. One controller includes a feedback circuit coupled to generate a feedback current signal that corresponds to a peak switching current in response to a sense signal from a power supply regulator output. A comparator is coupled to compare the feedback current signal with a reference voltage. A modulation circuit is coupled to the feedback circuit to generate a pulse width modulated switching signal with fixed switching frequency in response to the feedback current signal and the reference voltage. A multi-cycle modulator circuit is coupled to the output of the comparator. The multi-cycle modulator circuit is coupled to enable or disable a switch signal from the controller to be coupled to a switch of the power supply regulator. A group of two or more consecutive switching cycles is separated from a next group having two or more switching cycles by a time of no switching. The time of no switching is adjusted in closed loop to regulate a transfer of energy from a power supply regulator input to the power supply regulator output. |
申请公布号 |
US7965524(B2) |
申请公布日期 |
2011.06.21 |
申请号 |
US20100767564 |
申请日期 |
2010.04.26 |
申请人 |
POWER INTEGRATIONS, INC. |
发明人 |
BALAKRISHNAN BALU;ODELL ARTHUR B. |
分类号 |
H02M3/335 |
主分类号 |
H02M3/335 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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