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专家点评:鉴于以上缺点,并联式开关电源除了由启动电路、振荡电路、误差取样放大电路和脉宽调节电路组成的常规电路外,为了保证开关电源和负载电路可靠地工作,还设置了许多附属电路。例如:①为防止开关管因开启损耗大或关断损耗大而损坏,设置了开关管恒流激励电路;②为防止负载短路使开关管因过电流损坏,而设置了开关管过电流保护电路;③
Expert Comments: In view of the above shortcomings, parallel switching power supply in addition to the start-up circuit, the oscillation circuit, the error sampling amplifier circuit and pulse width modulation circuit of the conventional circuit, in order to ensure the switching power supply and load circuit to work reliably, but also set a lot of subsidiary Circuit. For example: ①To prevent the switch from being damaged due to large turn-on loss or turn-off loss, a constant current excitation circuit of the switch tube is set; ② In order to prevent the load short-circuit, the switch tube is over-current damaged due to over-current protection circuit ; ③