Advantages of Push-Pull Switching Power Supplies
1, push-pull switching power supply output current transient response speed is very high, the voltage output characteristics are very good. Push-pull switching power supply is the switching power supply with the highest voltage utilisation among all switching power supplies.
As the two control switches in the push-pull switching power supply work alternately in turn, its output voltage waveform is very symmetrical, and the switching power supply provides power output to the load throughout the cycle, so its output current transient response speed is very high, and the voltage output characteristics are very good. The push-pull switching power supply has the highest voltage utilisation of all switching power supplies. It can still maintain a large output power at very low input voltage, so push-pull switching power supply is widely used in low input voltage DC/AC inverter, live DC/DC converter circuit.
2, push-pull switching power supply is a switching power supply with good output voltage characteristics.
Push-pull switching power supply by the bridge rectifier or full-wave rectifier, its output voltage pulsation coefficient and current pulsation coefficient is very small, therefore, a very small value of energy storage filter capacitor or energy storage filter inductor can be obtained by a voltage ripple and current ripple is very small output voltage. Therefore, push-pull switching power supply is a switching power supply with good output voltage characteristics.
3, push-pull switching power supply transformer leakage inductance as well as copper resistance loss than unipolar magnetised pole transformer is much smaller, switching power supply high efficiency.
Push-pull switching power supply transformer belongs to the bipolar magnetisation pole, the magnetic induction transformer range is more than twice as much as the unipolar magnetisation pole, and the transformer core does not need an air gap, so the permeability of the core of the push-pull switching power supply transformer is many times higher than that of the core of the transformer of the single-polar magnetisation pole of the forward or backward switching power supply, so that the number of turns of the primary and secondary coils of the push-pull switching power supply transformer can be higher than that of the unipolar magnetisation pole transformer primary and secondary coil, and the number of turns of the primary and secondary coil can be lower than that of the unipolar magnetisation pole transformer. The number of turns of the primary and secondary coils of the push-pull switching power supply transformer can be more than double that of the primary and secondary coils of the single-polarity magnetisation pole transformer. Therefore, the leakage inductance and copper resistance loss of push-pull switching power supply transformer are much smaller than that of unipolar magnetised pole transformer, so the working efficiency of switching power supply is high.
4, push-pull switching power supply drive circuit is simple.
Push-pull switching power supply two switching devices have a common ground, compared to half-bridge or full-bridge switching power supply, the drive circuit is much simpler.
5, push-pull switching power supply will not be like a half-bridge, full-bridge switching power supply as the possibility of two control switches at the same time crosstalk.
