Chargers (chargers) can be divided into power frequency machines and high-frequency machines according to the design circuit working frequency. The power frequency machine is designed based on the traditional analog circuit principle. The internal power devices (such as transformers, inductors, capacitors, etc.) of the machine are large. Generally, there is small noise when the machine is operating with large load. However, the machine has strong resistance performance, reliability and stability in harsh grid environment conditions.
The high frequency machine takes the microprocessor (CPU chip) as the processing and control center. It records the complicated hardware analog circuit in the microprocessor and controls the operation of UPS in the way of software program. 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 high-frequency machine is generally above 20KHZ. However, the high frequency machine has poor tolerance under harsh power grid and environmental conditions, and is more suitable for the environment with relatively stable power grid, less dust and appropriate temperature/humidity.
Compared with power frequency machines, high-frequency machines are small in size, light in weight, high in operation efficiency (low in operation cost), low in noise, suitable for office space, high in cost performance (low in price at the same power), and have little impact on space and environment. Relatively speaking, high-frequency chargers are vulnerable to impact (SPIKE) and transient response (TRANSIENT) caused by copiers, laser printers and motors, Because the transformer of the power frequency machine isolates the mains power from the load, the power frequency machine provides more safe and reliable protection than the high-frequency function under the harsh environment of the mains power. In some occasions, such as medical treatment, the charger is required to have an isolation device. Therefore, the power frequency machine is a better choice for industrial, medical, traffic and other applications. The choice of the two should be considered according to the customer's different, installation environment, load conditions and other conditions.