Electrical Encyclopedia: The forward transformer duty cycle is mainly dependent on the input and output of the secondary freewheeling inductor.

The forward duty cycle is mainly dependent on the input and output of the secondary freewheeling inductor.

It is the use of transformer magnetizing inductance and MOSFET junction capacitance resonant reset, but the required inductance and capacitance need to be calculated in detail, usually need to open the air gap of the forward transformer. The reset current is generally relatively small, so the reset winding heat is also smaller, on the inner layer generally can be completed to facilitate the control of the process. Transformers are generally reset, primary, secondary, and auxiliary.

The forward transformer duty cycle is mainly dependent on the input and output of the secondary freewheeling inductor.

If the secondary winding is inside, the single-turn length of the copper wire used in this winding is small and the DC loss is low, but the heat dissipation is a bit worse. If it is outside, the situation is opposite.

For a forward power supply, the turns ratio affects the duty cycle, the peak current of the primary and secondary circuits, the number of turns, and the inductance of the secondary energy storage inductor.

There is no bias magnetic flux and direct fault, the main advantage is the high reliability. At the same frequency, the forward transformer core heat only bridge 1/3. 200W-500W forward transformer, can add 0.05-0.1 The air gap of MM can reduce the number of primary turns, increase the frequency appropriately, and further reduce the number of turns to reduce the amount of heat generated by the wires.

When the forward power is turned on and off, what components are included in the primary and secondary currents? After steady state? The two clamp diodes of the two-transistor forward are turned on at the time of reset, so that the voltage across the clamp MOSFET is approximately equal to the DC bus voltage, and the reset diode is preferably restored in an ultra-fast manner. The ideal choice is BYV26C or the like. The tube, UF series can also be.

The tube assembly needs to be installed with end plugs to prevent dust and other objects from entering the quick connector and causing the connector to be blocked.

End Plug

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