SMPS float capacitor question Page 1 of. Which gives me about 24 volts DC that I feed into the sg3525 and ir2110.

Offline Half-bridge converter Input: 160 to 240V AC 50/60Hz Output: 14.5v 10A (max) Final test circuit (on PCB) for battery charging. To be incorporated in SMPS inverter with charger. The primary side PWM is controlled by SG3525 PWM chip. Atomic mail sender. Frequency of operation is around 50kHz. The output signals of the SG3525 are fed into a IR2110 high-low side driver which drives the 2 MOSFETs (IRF840) configured for half-bridge topology. ETD39 core is used for the transformer. It was wound by hand at home by me.

A primary side snubber is used. 2 bulk capacitors (470uF, 200V each) are used for the half-bridge converter.

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An auxiliary 50Hz transformer (18V 100mA) is used to provide auxiliary low voltage output, which is rectified, filtered and regulated to 12V with a 7812 to power the SG3525, IR2110 and related circuitry. Since average current is low, voltage difference between 7812 input and output is not too great, the power dissipated by the 7812 is not too high and no heat sink is required. The output of the ETD39-based transformer is rectified with schottky rectifier STPS3045 and an LC filter is used to filter to pure DC. The output voltage is kept regulated using a zener-optocoupler based voltage feedback loop. The STPS3045 is mounted on a heatsink.

The output inductor is the large toroidal inductor beside the 50Hz transformer. It has not been mounted on the PCB. NTC has been used at the input side to limit inrush current due to charging of the LARGE BULK capacitors at the primary side. A fuse has been used for protection in case of short-circuit. A 200-ohm resistance is used at the output as 'dummy load'.

I have designed the PCB myself and have wound the transformer myself, at home. 1A offline flyback power supply with UC3842 Input: 160 to 240V AC 50/60Hz Output: 14.5v 1A (max) Could be used as auxiliary power supply. The primary side PWM is controlled by UC3842 chip. The UC3842 drives the high voltage MOSFET (IRF840) directly as it has a built-in MOSFET driver. 50k resistor is used for startup from the high voltage DC bus - the UC3842 has built-in zener diode that limits voltage, provided current is low enough. EE25 core was used for the transformer.

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I wound the transformer myself. The output of the transformer is rectified with ultrafast rectifier 31DF6 and capacitor is used to filter to pure DC.

The output voltage is kept regulated using a zener-optocoupler based voltage feedback loop. NTC has been used at the input side to limit inrush current due to charging of the capacitor at the primary side. A fuse has been used for protection in case of short-circuit. This is one of the oldest SMPS circuits I had made. I made it sometime in 2008. 2A flyback power supply with TOP-GX Input: 160 to 240V AC 50/60Hz Output: 14.5v 2A (max) The power supply is based on the dedicated offline-switcher 'TOPSwitch-GX' TOP245Y, which contains both the primary PWM controller and the high-voltage MOSFET.

EE25 core was used for the transformer. I wound the transformer myself. The output of the transformer is rectified with ultrafast rectifier MUR420 and LC filter is used to filter to pure DC. The output voltage is kept regulated using a TL431-optocoupler based voltage feedback loop. NTC has been used at the input side to limit inrush current due to charging of the capacitor at the primary side. A fuse has been used for protection in case of short-circuit. This is one of the oldest SMPS circuits I had made.