Charger principle

A charger is a device for charging other electrical appliances. The equipment adopts high frequency power supply technology, intelligent dynamic adjustment charging technology, and uses power electronic semiconductor devices to convert constant voltage and constant frequency alternating current into direct current. Generally composed of flexible printed circuit board and electronic components. According to the working frequency of the designed circuit, it can be divided into power frequency machine and high frequency machine, which are widely used in major cities, especially in the field of life, and are widely used in common appliances such as mobile phones and cameras. Charger can be divided into power frequency machine and high frequency machine according to the working frequency of the designed circuit. Power frequency machine is designed according to the principle of traditional analog circuit, and its internal power devices (such as transformer, inductor, capacitor, etc.). ) are relatively large, and generally the noise is very small when running under heavy load, but this machine has strong reactance performance and stronger reliability and stability than the high-frequency machine in the harsh power grid environment.

The high-frequency machine takes the microprocessor (CPU chip) as the processing control center, records complex hardware analog circuits in the microprocessor, and controls the operation of UPS through software programs. Therefore, the volume is greatly reduced, the weight is greatly reduced, the manufacturing cost is low, and the price is relatively low. The frequency conversion 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 power grid stability, less dust and low temperature/humidity.

Compared with the power frequency machine, the high frequency machine is small in size, light in weight, high in operating efficiency (low in operating cost), low in noise, suitable for office places, high in cost performance (low in price at the same power), and has little impact on space and environment. Relatively speaking, the peak and transient response of high-frequency charger to photocopiers, laser printers and motors are easily affected. Because of the power frequency machine, in the harsh environment of commercial power, power frequency machine provides safer and more reliable protection than high frequency machine. In some occasions, such as medical treatment, it requires the charger to have an isolation device. Therefore, the power frequency machine is a better choice for industrial, medical and transportation applications. The choice of the two should be considered according to different customers, installation environment and load conditions.