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    • 4. 发明授权
    • Power supply for microwave discharge light source
    • 微波放电光源供电
    • US4988922A
    • 1991-01-29
    • US329786
    • 1989-03-17
    • Isao ShodaHitoshi KodamaKazuo MagomeAkihiko IwataKenji YoshizawaMasakazu Taki
    • Isao ShodaHitoshi KodamaKazuo MagomeAkihiko IwataKenji YoshizawaMasakazu Taki
    • H01J65/04H05B41/24H05B41/282H05B41/392
    • H01J65/044H05B41/24
    • A power supply circuit for a magnetron adapted to supply microwave energy to an electrodeless discharge bulb is disclosed. The circuit comprises a rectifier coupled across a commercial AC voltage source, a filter for smoothing the output of the rectifier, an inverter for converting the DC voltage supplied from the filter into a high frequency AC voltage, a step-up transformer for stepping up the high frequency AC voltage outputted from the inverter, and a rectifier which rectifies the high voltage AC output of the transformer into a unidirectional voltage which is supplied to the magnetron. The inverter switching is controlled by a pulse width modulation control circuit to maintain the magnetron output power at a predetermined level. According to one aspect, an inductance is provided in the circuit which supresses high frequency components in the currents flowing through the windings of the transformer; according to another aspect, the inverter switching frequency (expressed in kHz) is set at a value not less than 1500/D, wherein D represents the diameter of the electrodeless bulb expressed in millimeters; according to still another aspect, the peak to the mean value ratio of the magnetron current is limited under 3.75 inclusive.
    • PCT No.PCT / JP88 / 00753 Sec。 371日期:1989年3月17日 102(e)日期1989年3月17日PCT Filed 1988年7月27日PCT公开号 出版物WO89 / 01234 日期:1989年2月9日。公开了一种用于向无电极放电灯提供微波能量的磁控管的电源电路。 该电路包括跨越商用交流电压源耦合的整流器,用于平滑整流器输出的滤波器,将从滤波器提供的直流电压转换成高频交流电压的逆变器,用于加速 从逆变器输出的高频交流电压,以及将变压器的高压交流输出整流为提供给磁控管的单向电压的整流器。 逆变器切换由脉宽调制控制电路控制,以将磁控管输出功率维持在预定水平。 根据一个方面,在电路中提供电感,其抑制流过变压器绕组的电流中的高频分量; 根据另一方面,逆变器开关频率(以kHz表示)设定为不小于1500 / D的值,其中D表示以毫米表示的无电极灯泡的直径; 根据另一方面,磁控管电流的平均值比的峰值被限制在3.75以下。