I. Introduction
The auxiliary power supply supplies power to control systems such as the main control unit, display module, protection control unit, signal acquisition unit, and card swiping module. Its function is to provide a stable low-voltage power supply to the control circuit and drive circuit, ensuring that the control circuit and drive circuit can work stably and reliably. It can be designed into stabilized DC power of 5V, 12V, 24V and other voltages according to different voltage requirements.
2. Product application
Auxiliary power supplies are an important part of industrial applications such as motor drives, photovoltaic inverters, welding machines, frequency converters and UPS systems.
3. Typical application topology diagram
The auxiliary power supply generally uses a single-switch flyback topology: it has a simple structure, a small number of components, and a low cost; however, when the power switch MOS tube in the single-switch flyback converter is turned off, the MOS tube will withstand twice the input voltage. stress, so we recommend ultra-high voltage MOS tubes for this type of topology application to cope with the impact of voltage changes.
4. Recommendation of auxiliary power MOS tube
For auxiliary power supply single-switch flyback topology applications, we recommend the Reasunos Semiconductor ultra-high-voltage MOS series. Reasunos Semiconductor's R&D and mass production of 800V-1500V ultra-high-voltage MOSFETs have filled the gap in the domestic market and broken the monopoly of imported brands.
Advantages of Reasunos Semiconductor's ultra-high voltage MOS products:
1. New lateral variable doping technology, ultra-high voltage, ultra-small internal resistance;
2. Good heat dissipation performance, small leakage at high temperatures, and small voltage drop at high temperatures;
3. Lower switching speed achieves better EMI compatibility;
4. Product performance is reliable and import substitution is fully realized.
5. Recommended selection table
The main selection of ultra-high voltage MOS for auxiliary power supply is as follows: