| 摘要 |
<p>An inverter is made up of a parallel circuit as voltage resonance circuit (201), and first diode (14), which are connected in series between both ends of a power source (102). Circuit (201) includes primary winding (2021) of output transformer (202), and resonance capacitor (204). First diode (14) is connected at the cathode to primary winding (2021) of transformer (202). Secondary winding (2022) of transformer (202) is coupled with load (12) such as a discharge lmap. The cathode and anode of first diode (14) are respectively connected to the collector and emitter of transistor (302). A series circuit of second diode (402) and capacitor (404) is connected across the collector-emitter path of transistor (302). Second diode (402) is forwardly arranged with respect to transistor (302). Voltage detector (501) comprises capacitor (404) and two resistors (406, 408) which are connected in series, and connected across capacitor (404). The output voltage is derived from the node of those resistors (406, 408). Error amplifier (504) compares the output voltage of voltage detector (401) and an output voltage from reference voltage source (502). VCO (506) oscillates at a switching frequency based on the comparison result. The oscillation output signal is applied to the base of transistor (302).</p> |
