The full name of the high-frequency machine is "high-frequency induction heating machine", which is currently the induction heating equipment with the highest heating efficiency, the fastest speed, low energy consumption, energy saving and environmental protection for metal materials. It is the induction heating equipment with the highest heating efficiency, the fastest speed, low energy consumption, energy saving and environmental protection for metal materials. The full name of the high frequency machine is "high frequency induction heating machine", also known as high frequency heating machine, high frequency induction heating equipment, high frequency induction heating device, high frequency heating power supply, high frequency power supply, high frequency welding machine, high frequency induction heating machine, High frequency induction heaters (welders), etc. In addition, there are medium frequency induction heating equipment, ultra high frequency induction heating equipment, etc. The application range is very wide.

High-frequency machine: Using high-frequency switching technology, 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 environments with stable power grid, less dust, and suitable temperature / humidity. The development direction of UPS is high frequency, miniaturization, intelligence and green. Because miniaturization can save investment, improve efficiency, save space, etc. The premise of miniaturization is high frequency, and only high frequency can achieve miniaturization. The first goal of miniaturization is to eliminate the input / output isolation transformer. In the past, due to technical, device and material reasons, input / output isolation transformers were added to the UPS, making the product bulky, poor performance, high energy consumption and expensive. Later, due to the advent of new devices, the new scheme first introduced by the US IPM company in 1980 successfully canceled the input isolation transformer. In recent years, due to the further development and maturity of the technology, the half-bridge inverter conversion scheme was launched and successfully The elimination of the output isolation transformer has greatly improved the performance of the UPS. This is what people call a high-frequency machine. It further reduces the size, improves the performance, reduces the weight, improves the efficiency, and reduces the UPS. Cost and reliability. Therefore, most well-known international companies have abandoned the production of UPS with output isolation transformers.

Comparison of high frequency machine and industrial frequency machine

Compared with the industrial frequency machine, the high-frequency machine has small size, light weight, high operating efficiency (low operating cost), low noise, suitable for office space, high cost performance (low price at the same power), and little impact on space and environment Relatively speaking, the shock (SPIKE) and transient response (TRANSIENT) caused by high-frequency UPS to copiers, laser printers and motors are easily affected. Because the transformer of the industrial frequency machine isolates the mains from the load, the mains In the environment, the power frequency machine provides more safe and reliable protection than the high frequency function. In some occasions such as medical treatment, the UPS is required to have an isolation device. Therefore, the industrial frequency machine is better for industrial, medical, transportation and other applications. select. The choice of the two should be weighed according to different users, installation environment, load conditions and other conditions.

The high-frequency machine does not have an isolation transformer, and there is a high-frequency current in the output neutral line, mainly from the harmonics of the commercial power grid *, the pulsating current of the UPS rectifier and high-frequency inverter, the harmonics of the load *, etc. The value is high and difficult to eliminate. The output voltage of the power frequency machine is low, and there is no high frequency component, which is more important for the safety of computer network communication.

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