The charger (charger) is divided according to the working frequency of the design circuit, and can be divided into a power frequency machine and a high frequency machine. The power frequency machine is designed based on the traditional analog circuit principle, and the internal power devices of the machine (such as transformers, inductors, capacitors, etc.) ) Are relatively large, and generally there is less noise when running with a large load, but this model has stronger resistance performance in harsh grid environmental conditions, and its reliability and stability are stronger than high-frequency machines.
The high-frequency machine uses a microprocessor (CPU chip) as the processing control center. It burns complicated hardware analog circuits into the microprocessor and uses software programs to control the operation of the UPS. Therefore, the volume is greatly reduced, The weight is greatly reduced, the manufacturing cost is low, and the price is relatively low. The inverter frequency of the high-frequency machine is generally above 20KHZ. However, the high-frequency machine has poor tolerance under the harsh power grid and environmental conditions, and is more suitable for the power grid to be more stable and dusty Low, suitable temperature/humidity environment.
In terms of comparison between high-frequency machines and industrial frequency machines: small size, light weight, high operating efficiency (low operating costs), low noise, suitable for office spaces, high cost performance (under the same power, low price), and impact on space and environment Relatively speaking, the impact (SPIKE) and transient response (TRANSIENT) caused by high-frequency chargers on copiers, laser printers and motors are easily affected. Because the transformer of the industrial frequency machine isolates the mains from the load, it is In harsh environments, power frequency machines can provide safer and more reliable protection than high frequency machines. In some situations, such as medical treatment, the charger is required to have an isolation device. Therefore, for industrial, medical, and transportation applications, power frequency machines are A better choice. The choice of the two should be considered according to the different conditions of the customer, the installation environment, and the load situation.
The characteristics of the industrial frequency machine are simple, and the existing problems are:
1) Large input and output transformer size;
2) The size of the output filter used to eliminate high-order harmonics is large;
3) Transformers and inductors produce audio noise;
4) The dynamic response performance to load and mains changes is poor.
5) Low efficiency;
6) The input has no power factor correction, which causes serious pollution to the grid;
7) The cost is high, especially for small-capacity models, which cannot be compared with high-frequency machines.
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