发明名称 |
Method and apparatus for maintaining a constant load current with line voltage in a switch mode power supply |
摘要 |
A power supply including a regulation circuit that maintains an approximately constant load current with line voltage. An example circuit includes a switch including first, second and third terminals. The first terminal is coupled or decoupled to the second terminal in response to a control signal received at the third terminal. Voltage sense circuitry is included and is coupled to sense a voltage drop across the switch. The voltage drop is representative of a current in the switch during an on time of the switch. The voltage sense circuitry has a variable current limit threshold that increases between a first level and a second level during the on time of the switch. The control signal is responsive to the variable current limit threshold to regulate a power supply with an output characteristic having an approximately constant output voltage below an output current threshold and an approximately constant output current below an output voltage threshold.
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申请公布号 |
US7215105(B2) |
申请公布日期 |
2007.05.08 |
申请号 |
US20060397524 |
申请日期 |
2006.04.03 |
申请人 |
POWER INTEGRATIONS, INC. |
发明人 |
BALAKRISHNAN BALU;DJENGUERIAN ALEX B.;WONG KENT;MATTHEWS DAVID MICHAEL HUGH |
分类号 |
G05F1/40;H02M3/28;H02M3/335 |
主分类号 |
G05F1/40 |
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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