Talking about the advantages and disadvantages of reversible pwm converter

H-type PWM converters are divided into three types: bipolar, unipolar, and restricted unipolar in terms of control methods. They have their own advantages and disadvantages.

The bipolar control bridge reversible PWM converter has the following advantages

1) The current must be continuous;

2) The motor can be operated in four quadrants;

3) There is a micro-vibration current when the motor stops, which can eliminate the dead zone of static friction:

4) The low-speed smoothness is good, and the system's speed adjustment range can reach around 1: 20000:

5) At low speeds, the driving pulse of each switching device is still relatively wide, which helps to ensure the reliable conduction of the device. The shortcomings of the bipolar control method are: during 1. During the operation, the 4 switching devices may be in the switching state, the switching loss is human, and the upper and lower bridge arms may be on during the switching accident, in order to prevent Through, the logic delay should be set between k and the driving pulse of the lower bridge arm. In order to overcome the above shortcomings, unipolar control can be used to keep some devices in a normally-on or normally-new state to reduce switching times and switching losses and improve reliability. However, the static and dynamic performance of the system will be slightly reduced by 5".
Related links Brief description of the role of pwm converter Reversible PWM converter working principle based on IR2110 H-bridge reversible PWM drive circuit application