The efficient electronic ballast is composed of rectifier-filter circuit, high-frequency inverse transforming circuit, power regulation circuit and filament preheating circuit.
本发明提出了一种高效电子镇流器，由整流滤波电路、高频逆变电路、功率调节电路及灯丝预热电路组成。
Then current through C1, RT forms the return circuit-preheating filament.
于是，电流通过C1、Rt形成回路预热灯丝。
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