| 摘要 |
With the AC voltage output from an inverter series-driving a high-Q parallel-loaded resonant L-C circuit, and with the parallel-connected load being of a type that needs to be conditioned before it will absorb power (as would be the case with loads such as magnetrons or fluorescent lamps), the inverter and/or the L-C circuit may be destructively overloaded during the time it takes for the load to become conditioned. In a power-line-operated inverter-type power supply with such a high-Q parallel-loaded resonant L-C circuit series-connected across its output, subject invention provides for means to prevent such destructive overload. In this power supply, the unfiltered pulsed DC output of a full-wave power-line-supplied rectifier is applied to a pair of inverters: an auxiliary inverter for pre-conditioning the load, and a main inverter for powering the load. The auxiliary inverter starts operating immediately upon application of power from the power line, and therefore immediately starts the process of conditioning the load. The main inverter, however, is not started until after the load has become adequately conditioned, at which time the load will adequately load the series-resonant L-C circuit. If at any time the main inverter is operating, but if the load is removed or otherwise fails to adequately load the L-C circuit, the main inverter is immediately disabled for a pre-determined period.
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