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    • 1. 发明申请
    • High efficiency electronic ballast for metal halide lamp
    • 金属卤化物灯高效电子镇流器
    • US20070222398A1
    • 2007-09-27
    • US11715612
    • 2007-03-07
    • Heping ChenMin ChenQin KongWenxiong Zhang
    • Heping ChenMin ChenQin KongWenxiong Zhang
    • H05B41/36
    • H05B41/2925Y02B20/208Y10S315/02
    • A high efficiency electronic ballast for large power metal halide lamp includes a power input circuit, a power factor correction circuit, a secondary power supply, a control circuit, a half bridge power converter, a resonant starting circuit, and lamp current on/off detector. The half bridge power converter has two DC block output capacitor to protect the converter when the output is shorted to ground. The operation frequency of the converter is chosen in the weak area of the acoustic resonant to avoid the acoustic resonant in the lamp. The control circuit adds a method for deep frequency and amplitude modulation and delay control function to the converter. For fine sweep pass through the output resonance point for igniting high voltage, two sweep rate control circuits are added. The metal halide lamp can be operated with very stable from starting to normal operation with high electronic ballast system efficiency.
    • 一种用于大功率金属卤化物灯的高效率电子镇流器包括电源输入电路,功率因数校正电路,二次电源,控制电路,半桥功率转换器,谐振启动电路和灯电流开/关检测器 。 半桥电源转换器有两个直流电阻输出电容,用于在输出短路到地时保护转换器。 在谐振的弱区域选择转换器的工作频率,以避免灯中的声谐振。 控制电路为转换器增加了深度和幅度调制和延迟控制功能的方法。 为了精细扫描通过用于点燃高电压的输出谐振点,增加了两个扫频速率控制电路。 金属卤化物灯可以以高电子镇流器系统效率从起始到正常运行非常稳定地运行。
    • 2. 发明授权
    • High efficiency electronic ballast for metal halide lamp
    • 金属卤化物灯高效电子镇流器
    • US07459862B2
    • 2008-12-02
    • US11715612
    • 2007-03-07
    • Heping ChenMin ChenQin KongWenxiong Zhang
    • Heping ChenMin ChenQin KongWenxiong Zhang
    • H05B37/02
    • H05B41/2925Y02B20/208Y10S315/02
    • A high efficiency electronic ballast for large power metal halide lamp includes a power input circuit, a power factor correction circuit, a secondary power supply, a control circuit, a half bridge power converter, a resonant starting circuit, and lamp current on/off detector. The half bridge power converter has two DC block output capacitor to protect the converter when the output is shorted to ground. The operation frequency of the converter is chosen in the weak area of the acoustic resonant to avoid the acoustic resonant in the lamp. The control circuit adds a method for deep frequency and amplitude modulation and delay control function to the converter. For fine sweep pass through the output resonance point for igniting high voltage, two sweep rate control circuits are added. The metal halide lamp can be operated with very stable from starting to normal operation with high electronic ballast system efficiency.
    • 一种用于大功率金属卤化物灯的高效率电子镇流器包括电源输入电路,功率因数校正电路,二次电源,控制电路,半桥功率转换器,谐振启动电路和灯电流开/关检测器 。 半桥电源转换器有两个直流电阻输出电容,用于在输出短路到地时保护转换器。 在谐振的弱区域选择转换器的工作频率,以避免灯中的声谐振。 控制电路为转换器增加了深度和幅度调制和延迟控制功能的方法。 为了精细扫描通过用于点燃高电压的输出谐振点,增加了两个扫频速率控制电路。 金属卤化物灯可以以高电子镇流器系统效率从起始到正常运行非常稳定地运行。
    • 8. 发明授权
    • Isolated flyback converter with efficient light load operation
    • 隔离式反激式转换器,具有高效的轻载操作
    • US08570772B2
    • 2013-10-29
    • US13359447
    • 2012-01-26
    • John D. MorrisMichael G. NegreteMin Chen
    • John D. MorrisMichael G. NegreteMin Chen
    • H02M3/335
    • H02M1/32H02M3/33584H02M3/33592H02M2001/0032Y02B70/1475Y02B70/16
    • A flyback converter uses primary side sensing to sense the output voltage for regulation feedback. Such sensing requires a predetermined minimum duty cycle even with very light load currents. Therefore, such a minimum duty cycle may create an over-voltage condition. In the flyback phase, after a minimum duty cycle of the power switch at light load currents, a synchronous rectifier turns off approximately when the current through the secondary winding falls to zero to create a discontinuous mode. If it is detected that there is an over-voltage, the synchronous rectifier is turned on for a brief interval to draw a reverse current through the secondary winding. When the synchronous rectifier shuts off, a current flows through the primary winding via a drain-body diode while the power switch is off. Therefore, excess power is transferred from the secondary side to the power source to reduce the over-voltage so is not wasted.
    • 反激转换器使用初级侧感测来检测输出电压以进行调节反馈。 即使使用非常轻的负载电流,这种感测也需要预定的最小占空比。 因此,这样的最小占空比可能产生过电压状态。 在反激阶段,在轻负载电流下电源开关的最小占空比之后,当通过次级绕组的电流下降到零时,同步整流器大致关闭以产生不连续模式。 如果检测到存在过电压,则同步整流器接通短暂的间隔以通过次级绕组产生反向电流。 当同步整流器关闭时,电源开关关闭时,电流通过漏极体二极管流过初级绕组。 因此,多余的功率从次级侧传输到电源,以减少过电压,因此不会浪费。