Chargers (chargers) are divided according to the working frequency of the design circuit, which can be divided into power frequency machines and high frequency machines. Power frequency machines are designed based on traditional analog circuit principles. The internal power devices (such as transformers, inductors, capacitors, etc.) ) Are relatively large, generally there is less noise when running with a large load, but this model has strong resistance to resistance in harsh grid environment conditions, and its reliability and stability are stronger than high-frequency machines.
The high-frequency machine uses a microprocessor (CPU chip) as a processing control center, and burns complicated hardware analog circuits into the microprocessor to control the operation of the UPS by means of a software program. Therefore, the volume is greatly reduced. The weight is greatly reduced, the manufacturing cost is low, and the selling 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 harsh power grid and environmental conditions, which is more suitable for grid stability and dust. Environment with low temperature and humidity.
Compared with high-frequency machines: high-frequency and small-frequency machines: small size, light weight, high operating efficiency (low operating cost), low noise, suitable for office places, high cost performance (low price at the same power), impact on space and environment Small, relatively speaking, the impact (SPIKE) and transient response (TRANSIENT) caused by high-frequency chargers on copiers, laser printers, and motors is easily affected.
In harsh environments, power frequency machines can provide more secure and reliable protection than high frequency machines.In some occasions such as medical treatment, it is required that the charger has an isolation device. Therefore, for industrial, medical, transportation and other applications, power frequency machines are Better choice. The choice of the two should be considered according to the different customers, installation environment, load conditions and other conditions.
The characteristics of the power frequency machine are simple, and the problems are:
1. The size of the input and output transformers is large;
2. The size of the output filter used to eliminate high harmonics is large;
3. Transformer and inductor generate audio noise;
4. The dynamic response performance to load and mains power changes is poor.
5. Low efficiency;
6. The input has no power factor correction, which causes serious pollution to the power grid;
7. high cost, especially for small capacity models, can not be compared with high-frequency machines.
Post time: Jul-03-2023