Charger (charger) according to the design circuit operating frequency to points can be divided into frequency machine and high frequency machine. Frequency machine is based on the traditional analog circuit principle to design, the machine internal power devices (such as transformers, inductors, capacitors, etc. ) Are larger, generally in the load with a larger operation there is a small noise, but the model in the harsh power grid environment resistance to strong resistance, reliability and stability than the high frequency machine strong.


The high-frequency machine is a microprocessor (CPU chip) as a processing control center, is a complex hardware analog circuit burned in the microprocessor, the software program to control the way the UPS operation. Therefore, the volume greatly reduced, greatly reduced the weight, low manufacturing costs, the price is relatively low. High frequency inverter frequency is generally above 20KHZ. But the high frequency machine in the harsh power grid and environmental conditions, poor tolerance, more suitable for the grid is relatively stable and less dust, temperature / humidity suitable environment.
High-frequency machine and frequency machine in terms of comparison: small size, light weight, high operating efficiency (low operating costs), low noise, suitable for office space; cost-effective (under the same power, low price), space, environmental impact Small, relatively speaking, high-frequency charger on the copier, laser printer and motor-induced shock (SPIKE) and transient response (TRANSIENT) vulnerable to the frequency of the transformer to the mains and load isolation, the electricity In the harsh environment, the frequency machine provides more secure and reliable protection than the high frequency function. In some occasions, such as medical treatment, the charger is required to have the isolation device. Therefore, for industrial, medical and transportation applications, A better choice. The choice of the two according to the customer's different installation environment, load conditions and other conditions to consider.
Frequency machine is characterized by a simple, the existence of the problem is:
1) input and output transformer size;
2) The output filter used to eliminate high harmonics is large in size;
3) Transformers and inductors produce audio noise;
4) Poor dynamic response to load and utility changes.
5) low efficiency;
6) input without power factor correction, the grid pollution is more serious;
7) high cost, especially for small capacity models, can not be compared with the high frequency machine.