Electro nS
Full Member level 6
hello guys
i want to use a mosfet as a high side switch ( instead of a relay)
there is no fast switching (of duty cycle) just 0 or 1 , just ON/OFF each couple of seconds .
to turn on the high side mosfet , you need about 12-15v between gate and source .
but i am using a micro-controller or a key button (digital pin NO PWM), so i need a circuit that can take 3-24v and transform that into isolated 15v . (very low current , 10-50mA)
i have disassembled a solid state relay with similar specification and i cannot on earth under stand the circuit they are using , i have drawn it (if anybody want to investigate i can post)
basically it uses 3coil transformer and an RC + transistor to transform any input DC voltage into AC (+/-2v) then past it to transfomer to create +/-12v signal then rectifies and some staff to drive the mosfet
i am thinking if there is easier way to do it . using 555 timer + transformer ? maybe or a small dc-dc conveter ?
note that most gate drivers are not for this type of applications, since they need switching and separate supply.
i want a reliable , easy method , price is not an issue .
what is your opinion
thanks in advance for help
i want to use a mosfet as a high side switch ( instead of a relay)
there is no fast switching (of duty cycle) just 0 or 1 , just ON/OFF each couple of seconds .
to turn on the high side mosfet , you need about 12-15v between gate and source .
but i am using a micro-controller or a key button (digital pin NO PWM), so i need a circuit that can take 3-24v and transform that into isolated 15v . (very low current , 10-50mA)
i have disassembled a solid state relay with similar specification and i cannot on earth under stand the circuit they are using , i have drawn it (if anybody want to investigate i can post)
basically it uses 3coil transformer and an RC + transistor to transform any input DC voltage into AC (+/-2v) then past it to transfomer to create +/-12v signal then rectifies and some staff to drive the mosfet
i am thinking if there is easier way to do it . using 555 timer + transformer ? maybe or a small dc-dc conveter ?
note that most gate drivers are not for this type of applications, since they need switching and separate supply.
i want a reliable , easy method , price is not an issue .
what is your opinion
thanks in advance for help
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