Medical high-voltage inverter control method

How a voltage control inverter helps in achieving voltage variation?

In the case of variable speed drives, inverters with voltage control help in achieving voltage variation. Voltage control of inverters is employed in order to compensate for changes in input dc voltage.

How to control AC voltage in an inverter?

Basically, there are three techniques by which the voltage can be controlled in an inverter. They are, Internal control of Inverter. In this method of control, an ac voltage controller is connected at the output of the inverter to obtain the required (controlled) output ac voltage.

Why are inverters used in motor control applications?

When inverters are used to feed such ac loads, it is necessary that the inverters provide provision for voltage variations so as to supply the required voltage to ac loads. In motor control applications, inverters handle the control of circuit voltage along with frequency so that the saturation of motor magnetic circuits is avoided.

What is internal control of inverter?

Internal control of Inverter. In this method of control, an ac voltage controller is connected at the output of the inverter to obtain the required (controlled) output ac voltage. The block diagram representation of this method is shown in the below figure.

How do inverter circuits work?

In this, the inverter circuit is fed from a constant dc voltage source and a controlled ac voltage is obtained at the output terminals by turning ON and OFF the switching components in the inverter circuit. The main drawback of this method is that it requires very low turn-ON and turn-OFF time thyristors which are very expensive.

What is external control of DC input voltage?

The external control of dc input voltage is a technique that is adapted to control the dc voltage at the input side of the inverter itself to get a desired ac output voltage at the load side. This method is further classified into two categories based on the type of source.