发明名称 |
LED ballast power supply having digital controller |
摘要 |
A power supply for an LED lamp has a set of coupled coils, primary-side power circuitry including a converter power switch for conducting input power, and secondary-side power circuitry including a dimming power switch. Power control circuitry includes converter control circuitry which generates a converter control signal for the converter power switch to maintain a desired undimmed level of lamp current at a normal operating value of a lamp voltage. Dimming control circuitry generates a dimming control signal for the dimming power switch to pulse-width modulate the lamp current at a duty cycle corresponding to a desired dimming. Operation of the converter control circuitry is modified during dimming to prevent an automatic increase of the lamp voltage in response to a decrease in lamp current, avoiding undesirable overshooting of the lamp current and providing more accurate and effective control over dimming operation. |
申请公布号 |
US8395329(B2) |
申请公布日期 |
2013.03.12 |
申请号 |
US20100868965 |
申请日期 |
2010.08.26 |
申请人 |
JUTRAS MARK;MASERA MARK;MOORE SCOTT;BEL FUSE (MACAO COMMERCIAL OFFSHORE) |
发明人 |
JUTRAS MARK;MASERA MARK;MOORE SCOTT |
分类号 |
G05F1/00;H05B37/02;H05B39/04;H05B41/16;H05B41/24;H05B41/36 |
主分类号 |
G05F1/00 |
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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