Silvio
Well-known member
Hi, can anybody help me calculate the values of a snubber needed for the primary winding of a half bridge smps?
At the moment I have 680pf 1kv with a series resistor of 150 ohms at 3watts but its getting rather hot!
Input voltage = 230 volts AC
Input dc voltage at transformer Primary is 155 Vdc
Output voltage is 45-0-45 volts dc
transformer used is EI 40
calculated output power is 350 - 400 watts
operating frequency is 75Khz
Mosfets used are IRF 740
Drive circuit with IR2153
duty cycle 50%
HELP IS GREATLY APPRECIATED.
At the moment I have 680pf 1kv with a series resistor of 150 ohms at 3watts but its getting rather hot!
Input voltage = 230 volts AC
Input dc voltage at transformer Primary is 155 Vdc
Output voltage is 45-0-45 volts dc
transformer used is EI 40
calculated output power is 350 - 400 watts
operating frequency is 75Khz
Mosfets used are IRF 740
Drive circuit with IR2153
duty cycle 50%
HELP IS GREATLY APPRECIATED.