发明名称 |
Electronic ballast with open circuit voltage control and cable compensation |
摘要 |
An electronic ballast uses a voltage sampling circuit and a voltage control circuit to limit the open circuit voltage of the ballast. A lamp voltage sensing circuit is provided that uses a voltage dividing capacitor to accomplish lossless monitoring of the open circuit voltage of the ballast. A resistor placed in series with the sampling capacitor is used to create a voltage that turns a control transistor off and on. The control transistor produces a gating signal trimming signal that a half bridge driver uses to alter the gating signals provided to the inverter transistors of the ballast. A cable compensation circuit is included that minimizes variations in the open circuit voltage due to the connecting and disconnecting of a cable to the ballast by turning the control transistor off and on.
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申请公布号 |
US7098606(B2) |
申请公布日期 |
2006.08.29 |
申请号 |
US20040004625 |
申请日期 |
2004.12.03 |
申请人 |
UNIVERSAL LIGHTING TECHNOLOGIES, INC. |
发明人 |
YU QINGHONG;RADZINSKI CHRISTOPHER;SHACKLE PETER;DERNOVSEK JOHN JAY |
分类号 |
H05B37/02;H05B37/00;H05B41/00;H05B41/14;H05B41/285;H05B41/36 |
主分类号 |
H05B37/02 |
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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