Table of Contents
How The Working Of The Inverter
Inverter dc The observed voltage and frequency of the power are AC. Converts to power.
BJT, MOSFET, IGBT MCT or SCR are used for the inverter. Devices other than SCR are used for low current rating, while SCR is used for high rating. The output voltage waveform of the inverter is sinusoidal or non-sinusoidal. Square wave inverters can be used for low and medium power requirement. When a low wave sine wave is used for more power. Output AC on the on and off time of the active device.
Inverter’s D.C. Input source battery, solar cell or any other DC. Can be lead. In most industrial uses, the first AC is converted to DC. The DC filtered voltage is used for the inverter.
The output voltage of a single phase inverter is 220 V, 50 Hz or 120 V, 60 Hz. While for three phases it is 220/380 V, 50 Hz or 115/200 V, 400 Hz. Apart from this it can be of any other voltage and frequency as required.
How The Working Principle Of The Inverter Works
The circuit for understanding the working principle is shown in the figure. Battery, switch and center tapping transformer are connected. Initially the switch is in B position. (Is off)
When the switch is moved to position A, current flows through the upper part of the transformer winding. Flux is generated in the core and emf is induced in the secondary winding, load current flows.
When the switch is brought to position C current flows from the bottom winding of the transformer, flux is generated in the opposite direction in the core and EMF is induced in the opposite direction in the secondary.
In fact a transistor or SCR is used instead of the above mechanical switch. SCR inverters are better than transistor inverters, as SCRs get a larger current rating and SCRs require less driving power.
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Voltage Control Of single Phase Inverter
Requirement of voltage control of inverter
Controlling the output voltage of the inverter is required in the SOGO outlined below.
A change in the input source voltage causes a change in the output voltage so the output voltage should be brought to the desired value.
To adjust the voltage change in the inverter.
At certain loads it is necessary to change the output voltage with a change in frequency. Such as in the variable speed control of an induction motor.
Types of voltage control
There are two types to control the voltage of an inverter. Which is as shown below.
- External control
A.C. in external control. The voltage controller is changed by placing the voltage controller between the inverter and the load, or the d at the inverter D. C. The voltage of the inverter is changed by changing the voltage.
2. Internal control of the inverter
In this way the control is given inside the inverter instead of the external control. The following two methods are used for this.
- Series inverter control
- Pulse Width Modulation (PWM) control
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