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(2)实际应用电路 图6是以IR51H420为核心构成的13W紧凑型电子镇流器应用电路原理图。该电路输入电源有两种方式:120V交流输入(AC1-N)和220V交流输入(AC1-AC2)。在120V AC输入条件下,线电压被整流并倍压,母线电压升到约300V。在220V AC输入条件下,线电压只被整流而不倍压,母线电压约300V。 图6中,泵升电路由C_(10)、VD5和VD6组成,当IR51H420开始振荡,泵升电路能够提供电流来增加
(2) Practical application circuit Fig. 6 is a circuit diagram of a 13W compact electronic ballast with IR51H420 as the core. There are two ways to input power to this circuit: 120V AC input (AC1-N) and 220V AC input (AC1-AC2). Under 120V AC input conditions, the line voltage is rectified and doubled, and the bus voltage rises to about 300V. Under 220V AC input conditions, the line voltage is only rectified without doubling the voltage, the bus voltage is about 300V. In Figure 6, the pump-up circuit consists of C_ (10), VD5 and VD6 and when the IR51H420 begins to oscillate, the pump-up circuit can supply current to increase