发明名称 |
Microwave discharge light source apparatus. |
摘要 |
<p>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. <IMAGE></p> |
申请公布号 |
EP0474315(A2) |
申请公布日期 |
1992.03.11 |
申请号 |
EP19910202577 |
申请日期 |
1988.07.27 |
申请人 |
MITSUBISHI DENKI KABUSHIKI KAISHA |
发明人 |
SHODA, ISAO;KODAMA, HITOSHI;MAGOME, KAZUO;IWATA, AKIHIKO;YOSHIZAWA, KENJI;TAKI, MASAKAZU |
分类号 |
H01J65/04;H05B41/24;H05B41/282;H05B41/392 |
主分类号 |
H01J65/04 |
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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