Half bridge power inverter configurations
What is Inverter?
The inverter is a power electronic converter that converts direct power to alternating power. By using this inverter device, we can convert fixed dc into variable ac power which as a variable frequency and voltage. Secondly from this inverter, we can vary the frequency . we will be able to generate the 40HZ, 50HZ, 60HZ frequencies as of our requirement. If the dc input is a voltage source then the inverter is known as VSI (Voltage Source Inverter). The half-bridge inverter needs two switching devices. The bridge inverters are of two types they are half-bridge inverter and full-bridge inverter. This article discusses the half-bridge inverter.
What is Half-Bridge Inverter?
The half-bridge inverter requires two signal switches which are connected in anti-parallel. The two signal switches are complementary switches which means when the first signal 1 switch is ON the second signal 2 switch will be OFF Similarly, when the second signal 2 switch is ON the first signal 1 switch will be OFF…..
The voltage rating of the transformer must be slightly lower than the battery voltage for square wave inverters.
PWM or SPWM, it should be equal to the average voltage applied at the gates of the MOSFETs. This can be measured by measuring the average DC voltage applied at the gate of the MOSFETs from the oscillator stage. So, suppose your battery voltage is 12 V, but because of PWM your average switching voltage from the oscillator shows 7.5 V DC, that implies your transformer must be a 7.5-0-7.5 V and not 12-0-12 V.