Admitting That my electronics knowledge is basic I really need some help from your community. Here is what I am trying to do.
What we are doing:
I need a heater coil fired. It is a pre-heater for an RC Helicopter engine block that we use for aerial reconnaissance during Alaskan wilderness surveys. Extreme cold requires us to preheat the block. We currently us resistance wire wrapped into a low ohm coil 0.05 ohms. We use the battery on the RC to fire the coils manually for about 10 seconds. With a fresh battery we are running @ 4.2 volts so we are drawing ~85 amps. We would like to radio control the heater so we can land the Chopper for extended times and take video without consuming fuel. but we are unable to preheat the block by remote.
What we have:
What I have Tried is to connect a manual micro switch to a servo and that works fine to fire a SSR but the SSR we have is bulky and to handle the amps we need also very costly.
What we need.
I have been trying to build a 555 timer circuit with a STGW40NC60V IGBT from mouser to fire the coil. Activating it with power to the gate portion of the circuit provided by the micro switch. and I just can't get it to work. Anyone willing to drop a schematic to point me in the right direction would be great. Here is our application and requirements.
Battery power is provided from an RC Li-Po battery Volt range from 3-4.2 volts it is 4.2 @ takeoff and drops as low as 3 volts after extended flight.
Coil Resistance is 0.05ohm fired off 4.2 volts so on paper the amp draw is ~84 amps.
Activation is by on board mechanical servo switch rates @ 500ma.
we went with the STGW40NC60V for availability and price and rewarped the coil to .1 ohm but want to co back to the out of the box 0.05ohm coil.
The Ultimate
I have been told if we use a 556 dual timer we can use 2 IGBT firing 50% cycles alternating and spread the load out. This would be ideal.
Any help would be great.
What we are doing:
I need a heater coil fired. It is a pre-heater for an RC Helicopter engine block that we use for aerial reconnaissance during Alaskan wilderness surveys. Extreme cold requires us to preheat the block. We currently us resistance wire wrapped into a low ohm coil 0.05 ohms. We use the battery on the RC to fire the coils manually for about 10 seconds. With a fresh battery we are running @ 4.2 volts so we are drawing ~85 amps. We would like to radio control the heater so we can land the Chopper for extended times and take video without consuming fuel. but we are unable to preheat the block by remote.
What we have:
What I have Tried is to connect a manual micro switch to a servo and that works fine to fire a SSR but the SSR we have is bulky and to handle the amps we need also very costly.
What we need.
I have been trying to build a 555 timer circuit with a STGW40NC60V IGBT from mouser to fire the coil. Activating it with power to the gate portion of the circuit provided by the micro switch. and I just can't get it to work. Anyone willing to drop a schematic to point me in the right direction would be great. Here is our application and requirements.
Battery power is provided from an RC Li-Po battery Volt range from 3-4.2 volts it is 4.2 @ takeoff and drops as low as 3 volts after extended flight.
Coil Resistance is 0.05ohm fired off 4.2 volts so on paper the amp draw is ~84 amps.
Activation is by on board mechanical servo switch rates @ 500ma.
we went with the STGW40NC60V for availability and price and rewarped the coil to .1 ohm but want to co back to the out of the box 0.05ohm coil.
The Ultimate
I have been told if we use a 556 dual timer we can use 2 IGBT firing 50% cycles alternating and spread the load out. This would be ideal.
Any help would be great.