I need to create a 100-120V 50mA output from a transformer.
I do not need continuous steady output (no need DC 120V a 120V pulsating signal on output is enough.)
- secondary impedance 1.2kOhm
- primary impedance 8Ohm
- The primary current is limited to 0.75A. -The frequency response of transformer 10Hz to 10kHz.
- PWM signal is from STM32F103C8 microcontroller 3.3V DC (PWM frequency 20Hz-1kHz)
I have the following doubts:
Will a 12V DC PWM signal create 120V and 50mA on secondary winding?
Following is my schematic. Is it possible to workout?
Back EMF from the transformer primary winding - do I need a diode across the winding?
The main purpose of this circuit is built a transcutaneous electrical nerve stimulation machine as shown in http://chemelec.com/Projects/Tens/Tens-2-Rev-4.png
Turns Ratio N3 2-3: 0.11 gage 380 turns
N2 1-2: 0.11 gage 380 turns
and N1 4-5: 0.21 gage 60 turns
I am using 1-3 (output 120V generation) and 4-5 (input 12V)here.