A parallel switching power supply, also known as a parallel regulated power supply, is a power supply system that uses multiple switching power supply modules to operate in parallel. This power supply system can provide higher output power and better stability, while also achieving load balancing and redundant protection. The following is an introduction to the principle of parallel switching power supplies:
Basic concepts of switching power supplies
A switch mode power supply is a high-frequency power conversion device that converts the input alternating current (AC) into the required direct current (DC). It uses the high-speed switching characteristics of modern power electronic devices (such as MOSFET, IGBT, etc.) to achieve high-efficiency energy conversion.
Composition of parallel switching power supplies
A parallel switching power supply is mainly composed of the following parts:
Input filter: used to filter out high-frequency noise in the power grid.
Rectifier: converts AC into pulsating DC.
Filter capacitor: smooths pulsating DC and reduces voltage fluctuations.
Switching circuit: consists of a switching tube, a control circuit, and a drive circuit, responsible for high-frequency switching operations.
Transformer: used for isolation and voltage conversion.
Output rectifier filter: converts the high-frequency AC output of the transformer into stable DC.
Control circuit: responsible for controlling the switching time and frequency of the switch tube to achieve a stable output voltage.
Protection circuit: including overvoltage, overcurrent, overheating and other protection functions.
Working principle of parallel switching power supply
1.Parallel principle
Multiple switching power supply modules run in parallel and share the same input and output. Each module can be controlled independently or coordinated by a central control unit.
2. Load balancing
The parallel switching power supply distributes the load evenly to each module through the load balancing algorithm to avoid overloading of a single module.
3.Redundancy protection
When a module fails, other modules can take over its load to ensure the continuous operation of the power supply system.
4 .Control strategy
Parallel switching power supplies usually adopt a master-slave control strategy, with one module as the master control module and the other modules as slave control modules. The master control module is responsible for coordinating the operation of the entire system.
Advantages of parallel switching power supplies
High reliability: modular design, easy maintenance and replacement.
High efficiency: high-frequency switching operation, low loss.
High flexibility: modules can be added or removed as needed to adapt to different load requirements.
High stability: load balancing and redundant protection improve the stability of the system.
Application of parallel switching power supply
Parallel switching power supply is widely used in communications, data centers, industrial automation, medical equipment and other fields.
Design considerations of parallel switching power supply
Modular design: easy to expand and maintain.
Thermal management: reasonable heat dissipation design to ensure stable operation of the power supply.
Electromagnetic compatibility: electromagnetic interference (EMI) issues need to be considered during design.
Control strategy: reasonable control strategy to achieve load balancing and redundant protection.
Future development of parallel switching power supply
With the development of power electronics technology, the future parallel switching power supply will be more intelligent, modular, and have higher efficiency and reliability.
Conclusion
The parallel switching power supply is an efficient and reliable power supply system. Through the parallel operation of multiple modules, load balancing and redundant protection are achieved, and the stability and reliability of the power supply system are improved. With the continuous advancement of technology, its application field will become more and more extensive.
