发明名称 |
Electronic ballast system |
摘要 |
An electronic ballast for use in illuminating a lamp includes a lamp driving circuit having a pulse-width modulated signal generator, a timing capacitor coupled to the lamp driving circuit, and a power controller. The power controller uses a current sense resistor to detect a current flowing through the lamp and an operational amplifier circuit to compare a signal associated with the detected current to a reference voltage associated with a desired lamp current. Based on the comparison, the power controller provides a correction current to the timing capacitor to control a duty cycle of an output of the pulse-width modulated signal generator.
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申请公布号 |
US6262542(B1) |
申请公布日期 |
2001.07.17 |
申请号 |
US20000574276 |
申请日期 |
2000.05.19 |
申请人 |
FAIRCHILD KOREA SEMICONDUCTOR LTD. |
发明人 |
KIM DAE-BONG;CHOI NAK-CHOON |
分类号 |
H05B41/16;H05B41/282;H05B41/392;(IPC1-7):H05B37/02 |
主分类号 |
H05B41/16 |
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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