What is the difference between high frequency UPS power supply and power frequency UPS power supply?

UPS power supply can be divided into two types: high frequency UPS and power frequency UPS. At present, the development direction of UPS is to replace power-frequency UPS with high-frequency UPS. High-frequency UPS power supply not only eliminates heavy transformers, but also improves efficiency by nearly 5%. Generally speaking, UPS with inverter output transformer is called power frequency machine, and UPS without inverter output transformer is high frequency machine.

What is the difference between high frequency UPS power supply and power frequency UPS power supply?

Generally speaking, UPS with inverter output transformer is called power frequency machine, and the power supply of UPS without inverter output transformer is high frequency machine. High-frequency machine usually uses IGBT for high-frequency switching rectification, while completing the function of power factor correction. All power frequency machines use thyristors to rectify the full-controlled bridge, which has great harmonic pollution to the power grid. High-frequency UPS power supply is an energy-saving and environmental protection model, and also a trend of development, because it has no output transformer, saves resources, reduces weight and improves efficiency. The world's major UPS manufacturers have launched high-power high-frequency machines.

(1) Different definitions

High Frequency Machine: High Frequency Switching Technology is used to replace UPS power supply of power frequency transformer in rectifier and inverter with high frequency switching elements, commonly known as high frequency machine. High Frequency Machine has small size and high efficiency.

Power Frequency Machine: The UPS power supply using power frequency transformer as rectifier and inverter components is commonly known as power frequency machine. Its main characteristics are stable and reliable main power components, strong overload ability, anti-impact and anti-interference ability, and strong load capacity.

(2) High frequency UPS power supply does not have isolation transformer, and its output zero line has high frequency current, mainly from harmonic interference of municipal power grid, pulsating current of UPS rectifier and high frequency inverter, harmonic interference of load, etc. Its interference voltage is not only high, but also difficult to eliminate. The output zero-ground voltage of power frequency UPS power supply is lower, and there is no high-frequency component. It is more important for the communication security of computer network.

(3) High-frequency UPS power supply is small in size, light in weight, low in price, suitable for the protection of low-power equipment at a single working point, and not sensitive to interference and high in reliability. The power frequency machine is suitable for all equipment protection, whether it is network equipment or IDC (data center), with high reliability, but it has the disadvantages of large volume, heavy weight and high price.

(4) Power frequency UPS power supply uses thyristor rectifier. After inversion, it needs to be boosted by transformer to supply power normally. Therefore, there is an output isolation transformer, so the volume is relatively large, which is suitable for high-power supply. High frequency UPS power supply uses IGBT rectifier and inverter, without output transformer boost, so there is no output isolation transformer, so the volume is relatively small, suitable for small power supply.

Characteristics and Performance of Power Frequency UPS Power Supply

UPS power supply breaks through the technical bottleneck of UPS industry, replacing traditional analog circuit with advanced digital circuit system, and realizes extraordinary innovation. In the digital circuit mode, high-speed microcontrollers and programmable logic devices are more perfect for circuit control, parameter setting and operation management, and more powerful for self-detection and self-detection. Full-range sampling technology is not only conducive to self-detection and fault analysis of all independent circuit connections on the circuit board, but also can be digitally converted to extremely pure and stable sinusoidal voltage to ensure ultra-stable operation of the system.

Power frequency UPS power supply imports advanced intelligent battery management system, which can automatically adjust the charging current parameters of batteries according to the configuration of users'batteries, and carry out uniform charging and floating conversion, temperature compensation charging and discharging management of batteries according to the power supply environment. The full digital control technology is adopted to realize the parallel redundancy function of multiple UPS.

The high precision SMD technology MD series of power UPS power supply has changed the traditional plug-in circuit processing technology. All of them adopt high precision SMD technology, which not only saves space, but also completely eliminates the pins in the traditional UPS circuit, so as to improve the safe operation of integrated circuits, and at the same time improve the reliability and operation accuracy.

Characteristics and Performance of High Frequency UPS Power Supply

High-frequency UPS is also called modular high-frequency UPS power supply. This UPS mainly adopts drawer-type high-intelligence modular design. It can meet the requirements of power output, input and reliability by adding or subtracting UPS modules in cabinet. It has great flexibility and achieves the best performance-price ratio. With plug-in function, not only can the power output and reliability requirements be satisfied by adding or reducing the modules in the cabinet, but also can be maintained online as long as redundancy permits, so as to achieve zero maintenance time. It is a milestone in the technological revolution of UPS industry to adopt full-scale control technology and concentrate the advanced technological achievements in the field of power electronics and automatic control.

The advanced two-stage and three-stage charging method is adopted in the module high-frequency machine. In the first stage, high current and constant current charging can be used to recharge about 90% of the power quickly. In the second stage, pulsating charging can homogenize the characteristics of the battery and fully charge the battery. In the third stage, constant voltage maintenance can ensure the loss of power. This can give a good consideration to the goal of fast charging and prolonging battery life, and save battery costs for users.

Using advanced wireless parallel control technology, compared with wired parallel connection, it reduces the single point of failure (even if the parallel communication line fault can work normally in steady state), and improves the reliability. Modular UPS high frequency machine adopts modular design and easy plug-in function. It consists of UPS module, communication module, distribution panel and some optional parts plus cabinet.

From the above comparison, it can be clearly seen that power frequency UPS power supply is superior to high frequency machine in many aspects. For some important and key parts with high reliability requirementsThe high precision SMD technology MD series of power UPS power supply has changed the traditional plug-in circuit processing technology. All of them adopt high precision SMD technology, which not only saves space, but also completely eliminates the pins in the traditional UPS circuit, so as to improve the safe operation of integrated circuits, and at the same time improve the reliability and operation accuracy.

Characteristics and Performance of High Frequency UPS Power Supply

High-frequency UPS is also called modular high-frequency UPS power supply. This UPS mainly adopts drawer-type high-intelligence modular design. It can meet the requirements of power output, input and reliability by adding or subtracting UPS modules in cabinet. It has great flexibility and achieves the best performance-price ratio. With plug-in function, not only can the power output and reliability requirements be satisfied by adding or reducing the modules in the cabinet, but also can be maintained online as long as redundancy permits, so as to achieve zero maintenance time. It is a milestone in the technological revolution of UPS industry to adopt full-scale control technology and concentrate the advanced technological achievements in the field of power electronics and automatic control.

The advanced two-stage and three-stage charging method is adopted in the module high-frequency machine. In the first stage, high current and constant current charging can be used to recharge about 90% of the power quickly. In the second stage, pulsating charging can homogenize the characteristics of the battery and fully charge the battery. In the third stage, constant voltage maintenance can ensure the loss of power. This can give a good consideration to the goal of fast charging and prolonging battery life, and save battery costs for users.

Using advanced wireless parallel control technology, compared with wired parallel connection, it reduces the single point of failure (even if the parallel communication line fault can work normally in steady state), and improves the reliability. Modular UPS high frequency machine adopts modular design and easy plug-in function. It consists of UPS module, communication module, distribution panel and some optional parts plus cabinet.

From the above comparison, it can be clearly seen that power frequency UPS power supply is superior to high frequency machine in many aspects. For some important and key parts with high reliability requirements