The Output Adjustable Flyback Converter

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Circuit : Simon Oh
Email: Simon@SoftSwitching.com

This circuit may also be downloaded in PDF format, please click here.

Description:
A high voltage step-up DC power supply using adjustable flyback conversion.

Specification:
Vin = 220Vac +-10% @ 50/60Hz
Vout =0~600Vdc @ 0.25A
Switching Frequency: 70~100KHz

fig 1

Design Guidelines:
DCM mode, output power is 200W

The input RMS current in worse condition with discontinuous current mode may be calculated as:

If the optimum operating duty cycle is set at D=0.35, then input peak current can be found as:

Therefore the voltage sensing limit voltage level from the FAN7554 data sheet is 1.5V

Source : http://www.zen22142.zen.co.uk/Circuits/Power/oafc.htm

This entry was posted on Thursday, June 28th, 2007 at 9:26 pm and is filed under Converter Circuit, high voltage power supply, inverter, switching power supply. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.