Advantages of push-pull switch mode power supplies
1. The push-pull switching power supply has a very high transient response speed of output current and good voltage output characteristics. The push-pull switching power supply has the highest voltage utilization among all switching power supplies.
Since the two control switches in the push-pull switching power supply work alternately, its output voltage waveform is very symmetrical, and the switching power supply provides power output to the load throughout the cycle. Therefore, its output current transient response speed is very high. , the voltage output characteristics are very good. The push-pull switching power supply has the highest voltage utilization among all switching power supplies. It can still maintain a large output power when the input voltage is very low, so the push-pull switching power supply is widely used in low input voltage DC/AC inverters and DC/DC converter circuits.
2. The push-pull switching power supply is a switching power supply with good output voltage characteristics.
After the push-pull switching power supply undergoes bridge rectification or full-wave rectification, its output voltage ripple coefficient and current ripple coefficient are very small. Therefore, a very small energy storage filter capacitor or energy storage filter inductor is needed to obtain a voltage Output voltage with very small ripple and current ripple. Therefore, the push-pull switching power supply is a switching power supply with good output voltage characteristics.
3. The leakage inductance and copper resistance loss of the push-pull switching power supply transformer are much smaller than that of the unipolar magnetized pole transformer, and the switching power supply has high working efficiency.
The transformer of the push-pull switching power supply has bipolar magnetization poles. The magnetic induction strain range is more than twice that of the unipolar magnetization pole, and the transformer core does not require an air gap. Therefore, the magnetic field of the push-pull switching power supply transformer core is The permeability is many times higher than the magnetic permeability of the transformer core of the forward or flyback switching power supply with unipolar magnetization. In this way, the number of turns of the primary and secondary coils of the push-pull switching power supply transformer is comparable to that of the unipolar magnetization The number of turns in the primary and secondary coils of the transformer is more than doubled. Therefore, the leakage inductance and copper resistance loss of the push-pull switching power supply transformer are much smaller than that of the unipolar magnetized pole transformer, so the working efficiency of the switching power supply is higher.
4. The drive circuit of the push-pull switching power supply is simple.
The two switching devices of the push-pull switching power supply have a common ground terminal. Compared with the half-bridge or full-bridge switching power supply, the driving circuit is much simpler.
5. The push-pull switching power supply does not have the possibility of two control switches colluding at the same time like the half-bridge and full-bridge switching power supply.
