发明名称 |
DISCHARGE LAMP BALLAST, LIGHTING UNIT, AND VEHICLE |
摘要 |
A discharge lamp ballast includes a DC-DC converter circuit configured to convert a voltage of a DC power supply by a switching operation of a switching element based on a PWM signal and to output a DC power, an inverter circuit configured to invert the DC power into an AC power, and a PWM ON-width control circuit configured to control switching conditions of the switching element in the DC-DC converter circuit immediately before a polarity of the AC power is reversed such that an ON-width of the PWM signal is increased from a start of a polarity reversal so as to increase the DC power in a predetermined period. The polarity of the AC power of the inverter circuit is reversed in synchronism with a switching timing of the switching element immediately after the control by the PWM ON-width control circuit to increase the ON-width.
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申请公布号 |
US2012038276(A1) |
申请公布日期 |
2012.02.16 |
申请号 |
US201013259411 |
申请日期 |
2010.03.18 |
申请人 |
NAKAMURA TOSHIAKI;PANASONIC ELECTRIC WORKS CO., LTD. |
发明人 |
NAKAMURA TOSHIAKI |
分类号 |
B60Q1/00;H05B41/36 |
主分类号 |
B60Q1/00 |
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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