AC power without power transistor switching circuit

  
AC-DC power supply without power switching circuit normally used for lighting load circuit, once the power grid or power is restored, the standby power supply automatic switching immediately. Automatic switching circuit using a transistor as shown, the
AC power without power transistor switching circuit - schematic

automatic switching time less than Is. Figure (a) applies to straight stream 12V standby power supply; Fig. (B) for DC 24V standby power supply; FIG. (C) For AC backup power.




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