Single-phase offline uninterruptible power supply

Single-phase is a common power protection device, which is used to provide power backup when the power grid fails to ensure the normal operation of the equipment. It usually consists of a rectifier, an inverter and a battery.

How it works

Under normal circumstances, power is supplied from the AC grid and converted to DC by a rectifier, while the battery pack remains charged. When a grid fault is detected, the inverter converts DC to AC for use by the equipment, while the battery provides energy to ensure continuous power supply to the system.

The role of MOS tube in single-phase offline uninterruptible power supply

MOS tubes (metal oxide semiconductor field effect transistors) are generally used as switching devices. Their main function is to convert direct current into alternating current in the inverter part.

By precisely controlling the on and off states of the MOS tube through the control circuit, the system can achieve accurate power conversion and ensure the stability of the output current.

Application of MOS tube in single-phase offline uninterruptible power supply

 -MOS tubes are generally used as switching devices, and their main function is to convert direct current into alternating current in the inverter part.

-The conduction and cutoff of the MOS tube can be precisely controlled by the control circuit, thus achieving efficient energy conversion and stable output current.

In an uninterruptible power supply, the selection of MOS tubes is crucial, because different MOS tubes have different parameters and characteristics. The appropriate selection of MOS tubes can improve the efficiency and reliability of the system. (Figure: Typical application topology diagram)

 Key points for selecting MOS tubes

Withstand voltage (VDS): The withstand voltage of the MOS tube should be greater than the maximum operating voltage of the inverter part to ensure stability and safety.

Maximum current (ID): The maximum on-state current of the MOS tube should be greater than the maximum load current of the system to avoid overload damage.

On-resistance (RDS(on)): The lower the on-resistance, the smaller the power consumption of the MOS tube when it is in the on state and the higher the efficiency.

Switching speed: The switching speed of the MOS tube affects the response speed of the system. Select a switching speed that suits the system requirements.

Thermal resistance: Consider the thermal resistance of the MOS tube to ensure that it does not overheat under high load conditions.

Reliability: Select MOS tubes with good reliability and durability to ensure long-term stable operation of the system.

 When selecting a MOS tube, in addition to considering basic parameters such as its withstand voltage, maximum current, on-resistance, switching speed, and thermal resistance, it is also necessary to comprehensively consider the actual needs of the system and the working environment. Choosing the right MOS tube is crucial.

Here we can recommend VBsemi's medium and low voltage MOS tubes , which can effectively meet the requirements of MOS tubes in the circuit design of single-phase offline uninterruptible power supply, and achieve efficient energy conversion and stable output current. In addition, VBsemi's MOS tubes have different parameters and characteristics , which can appropriately and effectively improve the efficiency and reliability of the system.