An Efficient Single-Phase AC to AC Buck and Boost Matrix Converter

Description

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OBJECTIVE

Increases the overall size, cost and complexity. Conversion efficiency is poor due to high power loss in two stage conversion. They have also low reliability due to presence of dc linked capacitor, are the basic drawbacks of ac to ac converter here An Efficient Single-Phase AC-to-AC Buck and Boost Matrix Converter is proposed.to overcome these drawbacks.

EXISTING SYSTEM

  1. Matrix converters change the magnitude and frequency of the output voltage without involving any intermediate stage. They are directly connected between the source and load. They can be the good replacement of the bulky indirect ac-to-ac converters
  2. Single-phase matrix converter proposed in can decrease the output voltage with an increase in the output frequency. It lacks the voltage boost and frequency buck capabilities, also matrix converters is developed for induction heating. Its comparison with indirect converter proves that matrix converters are best replacement of indirect ac-to-ac converters for induction heating application.
  3. The matrix converters used in ac-to-dc converters with boost Capabilities the main drawback of matrix converter is that The single phase matrix converters operated in buck mode can only buck the output voltage. They cannot be used in the application that requires boost or buck-boost operation.
  4. The matrix converter implemented with z-source arrangement proposed in can be operated in buck-boost mode. It solves the problem of limited voltage gain. The quality of the input current is improved as input current is continuous due to the z-source arrangement, At any given instant of time of the output voltage, four semiconductor switching devices are switched with PWM control. So, its switching losses are increased as they are proportional to switching frequency. The overall losses are high due to high conduction and switching losses that reduce its conversion efficiency. In this matrix converter, the quality of the output voltage is poor that increases its THD and hence it has poor power factor.

PROPOSED SYSTEM

In the proposed research, an efficient single-phase matrix converter is proposed that can be operated in buck and boost mode separately. The quality of the input current is improved due to inherent continuous current conduction in boost mode. The switching losses are reduced by switching only on semiconductor switch with PWM control. The conduction losses remain same as. So overall losses are reduced

that result in the improvement of conversion efficiency. The efficiency of the converter is also improved due to reduction of losses caused by the generated harmonics in boost operation.

ADVANTAGES

Reduces the Switching losses, thus enhances the switching converter efficiency. This also reduces the complexity of the control circuit

APPLICATION

Motor drives

CONCLUSION

This research focuses on an efficient ac-to-ac matrix converter that may be employed as a voltage and frequency changer operating in buck and boost mode separately. It can control both the frequency and magnitude of the output voltage.

The efficiency of this converter is improved by applying PWM control to only one switch out of eight controlled switches during each instant of time. This reduces the switching losses effectively. Conduction losses are also reduced by turning on

only three controlled switches. Four switches remain off in each half cycle of the input voltage. Conduction losses are also reduced by taking the advantage of low on-state resistance of MOSFET. The quality of the output voltage is also improved as there is no short through problem. The quality of the input current is improved in boost operation. The input current is continuous thus having low THD. The topology comes with advantage of high input power factor.

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