H - Electricity – 05 – B
Patent
H - Electricity
05
B
315/67
H05B 41/24 (2006.01) H01J 65/04 (2006.01) H05B 41/392 (2006.01) H05B 41/29 (1990.01)
Patent
CA 1304773
ABSTRACT 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.
573179
Iwata Akihiko
Kodama Hitoshi
Magome Kazuo
Shoda Isao
Taki Masakazu
Marks & Clerk
Mitsubishi Denki Kabushiki Kaisha
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