I have purchased the following H-bridge and I'm controlling it with a microcontroller:
My problem is that the MOSFETs will only conduct when the bridge supply voltage Vhv is in the 10-40V range.
I need finer voltage control for my application and would like Vhv to be able to be as low as 2V - giving a 2-40V range.
Is there a way I can bias in order to reduce the minimum bridge operating voltage?
My power supply voltage is 48V. I was thinking to use a separate power supply and bias the gates on the MOSFETS. Any advice appreciated
Here is a question restatement. Use as desired.
I am controlling a Peltier device.
I use a separate power supply to supply a voltage (Vhv) of 2 to 40V smoothed DC to the Peltier device. (This is derived by PWMing a 48V DC supply and then filtering the PWM to provide smooth DC).
I wish to use a full-bridge / H-bridge to change the polarity of the Peltier device so that I can change it from heating to cooling.
The fully-assembled Full bridge PCBA that I am attempting to use will only operate over a 10V to 40V Vhv range.
I wish to determine why the device is limited to a minimum of 10V on Vhv and whether I can modify it to operate over a 2-40V range, or even 2-48V. Any suggestions would be welcome.