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一、损坏原因开关管是彩电开关电源核心元件,由于工作在大电流、高电压的状态,除过流过压会造成损坏外,还应考虑其饱和导通时间与截止时间之比。损坏原因主要有以下方面。1.过压损坏因电源过压而烧坏开关管的原因主要有以下方面。(1)市电输入电压过高。开关管c-e极承受电压为市电经整流得到的电压与开关管截止时脉冲变压器自感电压之和,正常为450～650V之间(视机型而定)。若市电输入电压
First, the reason for damage Switch color TV switching power supply is the core component, due to work in high current, high voltage state, in addition to over-voltage will cause damage, but also should consider the saturation turn-on time and deadline ratio. The main reasons for damage are the following aspects. 1. Over-voltage damage due to over-voltage power supply and burn the main reasons for the switch in the following areas. (1) Mains input voltage is too high. Switch c-e extremely withstand voltage for the mains by the rectified voltage and the switch off the pulse transformer self-inductance voltage and the normal between 450 ~ 650V (depending on the model). If mains input voltage