Today we will talk about the application of MOSFETs in automotive inverters, hoping to be helpful to you. If you like it, please follow us!

The application of MOSFETs in automotive inverters is mainly used for controlling the circuit switch to achieve the conversion from DC to AC. MOSFETs have advantages such as fast switching speed, low loss, and high reliability, so they are widely used in automotive inverters.

Automotive Inverters

An automotive inverter is a device that converts the DC power of a car battery into AC power for use by onboard electrical appliances. In automotive inverters, the three main circuit control methods include push-pull control, anti-reverse connection protection circuit, and full-bridge circuit.

• Push-pull control is a commonly used inverter control method. It controls the polarity of the output voltage by using NPN and PNP transistors.

By alternately controlling the conduction and cutoff of the two transistors, the output voltage can be switched between positive and negative:

When the NPN transistor conducts, the output voltage is positive; when the PNP transistor conducts, the output voltage is negative. By alternately controlling the conduction and cutoff of the two transistors, the output voltage can be switched between positive and negative.

• The anti-reverse connection protection circuit is a circuit that protects the inverter from damage caused by reverse connection at the output port. It usually consists of a diode and a switching tube: when the output port is reverse connected, the diode conducts, diverting the reverse current to the switching tube, causing the switching tube to disconnect, protecting the inverter from damage.

• The full-bridge circuit is an efficient inverter control method that controls the polarity of the output voltage by using four switching tubes:

When the switching tubes on two diagonal lines conduct, the output voltage is positive; when the other two switching tubes on the diagonal lines conduct, the output voltage is negative. By alternately controlling the conduction and cutoff of the four switching tubes, the output voltage can be switched between positive and negative.

(Partial information comes from the internet, please use it with caution)

Application of MOSFETs in Automotive Inverters

MOSFETs have strong voltage and current bearing capacity, which can meet the high-power requirements of automotive inverters.

In automotive inverters, MOSFETs are usually used as switching devices. By controlling the conduction and cutoff of MOSFETs, the conversion from DC to AC can be achieved.

The application of MOSFETs in the three control methods of automotive inverters is as follows:

1. Anti-reverse connection protection circuit: mainly used to prevent MOSFET damage caused by reverse connection of the battery. By adding a diode to the control terminal of the MOSFET, when the positive and negative poles of the battery are reversed, the diode conducts, protecting the MOSFET.

2. Push-pull control: mainly used to control the output voltage of the automotive inverter. By alternately conducting two MOSFETs, the positive and negative half-waves of the output voltage are controlled. Simply put, when one MOSFET conducts, the other MOSFET is cut off, and the positive half-wave voltage is output; conversely, the negative half-wave voltage is output.

3. Full-bridge circuit: mainly used to control the output frequency of the automotive inverter. By alternately conducting four MOSFETs, the output frequency is controlled. Specifically, when the two MOSFETs on the diagonal lines conduct, the positive half-wave voltage is output; conversely, when the other two MOSFETs on the diagonal lines conduct, the negative half-wave voltage is output.

When MOSFETs are in operation, they have the advantages of low on-resistance, high switching speed, and low drive voltage, but they also have disadvantages such as high leakage current and high static power consumption.

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Here we recommend using VBsemi MOSFETs. VBsemi MOSFETs have the advantages of fast response, low voltage drop, and low power consumption, which can be efficiently applied in automotive inverters to protect the circuit from damage.