Charger is the use of high-frequency power technology, the use of advanced intelligent dynamic adjustment charging technology. Chargers are widely used in various fields, especially in the field of life is widely used in mobile phones, cameras and other common appliances. Charger is the use of power electronic semiconductor devices, the voltage and frequency of fixed alternating current into a DC current converter device. In the battery for the work of power or standby power supply occasions, the charger has a wide range of applications.
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 principle of analog circuit design, the machine internal power devices (such as transformers, inductors, capacitors, etc.) are larger, generally in the larger load with a small noise, but the model in the harsh Power system environmental conditions in the 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 the complex hardware analog circuit burned in the microprocessor, the software program to control the way the UPS operation.Therefore, the volume greatly reduced , Greatly reduce the weight, low manufacturing costs, the price is relatively low. High frequency machine 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 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, due to the frequency of the transformer to the mains and load isolation, In the harsh environment, the frequency machine provides more safe 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, The choice of the two options according to the customer's different installation environment, load conditions and other conditions to consider.
The frequency machine is characterized by simple, the existence of the problem is:
1) input and output transformer size;
2) The output filter used to eliminate higher harmonics is large in size;
3) Transformers and inductors produce audio noise;
4) Poor dynamic response to load and mains 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.
Reliability comparison between frequency machine and high frequency machine
1, high frequency machine is unreliable is untenable, the world's leading manufacturers in the technical selection and future development trends are based on high frequency as the absolute main direction, 30KVA and below the machines are mainly high frequency machine , Which is dynamic response with high frequency machine load fast, high energy density, small size, low noise, low price has a great relationship, especially high frequency machine can be input active power factor correction, the real representative of the future green power development trend.
2, those who questioned the reliability of high-frequency machine, you can be sure that the domestic brand-name small charger manufacturers themselves their limited technical strength, lack of test equipment, so the development of high-frequency machine in the process of development by the level of restrictions can not Improve the performance of the fuselage, which can only be introduced in the late 80s on the basis of the technology manufacturers in Taiwan to improve the frequency machine. Frequency machine to the development of high frequency machine is very important point is the high-frequency switching control anti-jamming problem to the front Of the technology, or recommended in the selection of funds such as sufficient funds, then: in the high-power aspects of the use of frequency machines, in the following 6KVA use of high-frequency machine.
Technical Differences between High Frequency Charger and Power Frequency Charger
With the continuous development of technology, many computers, power electronics field of new technologies, new ideas introduced to the charger industry.With the IT industry, other products similar to the front of the charger compared with the previous product, both in the main performance, Appearance size, the adaptability of the site environment and reliability, have
Significant progress, some indicators and even qualitative leap, for large and medium-sized charger is even more so.