soft light dimmer circuit

Posted on Feb 7, 2014

This is a design circuit for soft light dimmer. This circuit uses the IGBT STGP10N50A and the TS555 timer as main components. The timer is triggered on the zero crossing voltage pulse. The time constant determined by C5/R14+R15 that is used to determine the conduction angle. The T2 T3 inhibits the power switch until the auxiliary supply voltag

soft light dimmer circuit
Click here to download the full size of the above Circuit.

e reaches 8V to guarantee that the gate of the IGBT receives correct voltage level. This is the figure of the circuit R5 is the current sense resistor, that is used for the short circuit and over-current protection. The gate of the IGBT will taken low and turn off, when the voltage across R5 reaches the sensitive gate thyristor`s gate trigger voltage. At the same time the timer will reset. This current limiting also provides protection against excessive in-rush current and automatic soft-start. [Circuit Source: STMicroelectronics Application Note]

Leave Comment

characters left:

Related Circuits

  • New Circuits



    Popular Circuits

    Control 32 DAC channels via a parallel port
    Brief introduction of circuit diagram of the inverter and principle
    60MHz Frequency Meter / Counter 10Hz to 60MHz
    a more practical capacitor powered
    inverter circuit
    Battery Charger Regulator
    Circuit explanation of DC/AC inverter
    Portable hypoxia monitoring circuit ICL7660 PC254A PC153A