Resonant inverters convert DC to AC and are used in various applications such as UPS, induction heaters, and medical equipment. They use an unmodulated single-phase system and controlled switches to determine power output. The damping factor affects energy loss, which can be controlled through passive elements or auxiliary methods. Resonant inverter technology is applied in many areas including non-contact power transfer and DC-DC converters.
A resonant inverter is a special electrical energy conversion circuit which is used to change direct current (DC) to alternating current (AC) for a simpler application. There are different types of electric inverters which are used for different purposes. This mainly involves converting power through both direct and alternative means. For example, resonant inverters are used in uninterruptible power supplies (UPS), electric induction heaters, microwaves, surface sensing devices or sonar systems, medical diagnostic equipment, high frequency radio and communication devices, fluorescent lighting, and transfer of inductive power pairs.
The main difference between typical inverters and a resonant inverter is that resonant inverters convert electrical energy through an unmodulated single-phase system whose structure depends on the nature of the DC source. It can deliver electric waves from DC voltage or current power sources. The resonant inverter is based on an electronic oscillator with unidirectional or bidirectional switches, depending on the type of current in use. Switches consist of controlled components connected to a single diode. The controlled components ultimately determine the switch swapping mechanism.
The effective operation of an electrical inverter depends on the inherent characteristics of its network of circuits. These characteristics include the damping factor, the underdamped natural frequency, and the switching frequency of the controlled internal components. In a resonant inverter, the actual power output is determined by the swings of the switches. A switch with a high damping factor has a low rate of energy loss because its oscillations extinguish more slowly. This is the ideal type of switch for electric inverters. On the other hand, one with an underdamped circuit has a higher rate of energy loss as its oscillations die off much faster.
It is possible to control the energy loss within the inverter by adding passive elements to the load of the device. However, this will lead to an increase in the price and weight of the device, but this will be compensated by a better use of its internal components. Better control of energy loss can be achieved through the use of auxiliary methods such as controlling the amplitude of the direct current entering the device.
There are many industrial and household applications for electrical inverters. Non-contact power transfer, induction heating, DC-DC converters, and uninterruptible power supplies are just some of the areas where resonant inverter technology is applied. The power output obtained from the device can be connected to transformer windings, extended coils and other components. The unique way in which a resonant inverter converts electrical energy can be applied in numerous electronic processes.
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