Xinjie Energy 1500V/1700V power VDMOS

Time：2024-03-22　Reading：70

     In the inverter auxiliary power supply or photovoltaic inverter, the main role of the auxiliary power supply is to depressurize the DC high voltage, and supply power to the driver IC, the main control MCU, and the communication module chip. Taking the inverter of 380V system as an example, because the auxiliary power supply is the high-voltage input after 380V rectification, and the voltage after rectification and filtering is generally about 550V, the auxiliary power supply of the inverter is generally flyback design, and the power device is generally required to leave 1.5-2.5 times the margin, and the maximum voltage margin of 2.5 times is required to withstand 1375V. Therefore, it is necessary to apply to 1500V pressure-resistant MOS tubes. In the auxiliary power supply of photovoltaic inverter, due to the different bus voltage and power, single-tube flyback or double-tube flyback topology is generally selected, and no matter what kind of topology is inseparable from the core power device, that is, 1500V~1700V power MOS.

Typical auxiliary power supply (left) single-tube flyback topology; (Right) Topology of a two-tube flyback auxiliary power supply

Xinjie Energy launched 1500V and 1700V series power VDMOS, taking 1700V and 3A products as an example, the key parameters compared with mainstream foreign competitors are as follows:

     It can be seen that NCE3N170T has a smaller on-resistance and a smaller gate charge than foreign competitors, so the FOM (on-resistance X gate charge), which represents the overall switching and on-loss of the device, is about 10% lower than the competition. In addition to excellent performance, the 1500V and 1700V power VDMOS introduced by Xinjian Energy also have the following characteristics: large voltage tolerance: ensure that the device can 100% guarantee the voltage greater than the rated voltage requirements at low temperature to -40℃; Provide maximum protection for the device to work outdoors or under extremely cold conditions; High device junction temperature: the maximum allowable transient working junction temperature is 175℃, which provides a greater safety margin for transient overload of the system; Strong reliability: The product can not only pass the conventional reliability assessment items, but also meet the 100% bias HTRB\HTGB assessment at the maximum junction temperature and the more stringent HV-H3TRB assessment, to ensure the stable work of the device under high temperature, high humidity and other harsh conditions. At present, the 3A products of 1500V and 1700V series power VDMOS have been mass-produced, and the other current specifications products are being launched one after another.