DC-AC conversion - Inverter and frequency converters

Power Electronics » DC-AC conversion - Inverter and frequency converters

DC/AC converter, also described as “Inverter”, is a circuit that converts a DC source into a sinusoidal AC voltage to supply AC loads, control AC motors, or event connect DC devices that are connected to the grid. Similar to a DC/DC converter, the input to an inverter can be a direct source such as battery, solar cell, or fuel cell or can be from an intermediate DC link that can be supplied from an AC source. Inverters can be usually classified according to their AC output as single-phase or three-phase and also as half- or full-bridge converters. De Lorenzo has designed two configurations to implement this category. One configuration to cover the inverters with PWM control and another configuration to explain the properties of the frequency converter circuit. Regarding the frequency converter and because it is difficult to change the frequency of an AC sine wave in the AC mode, the first job of a frequency converter is to convert the wave to DC because it is relatively easy to manipulate DC in order to make it look like AC. The three main components of all frequency converters are Rectifier, DC Bus and Inverter. They are dedicated to high schools and first years of university.

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DIRECT CURRENT ALTERNATE CURRENT CONVERSION

This type of converters are used in ac motor drives and in ac uninterruptible power supplies, where the objective is to supply a sinusoidal ac output with controlled amplitude and frequency.
In this section of the laboratory inverters and frequency converters are studied.
This trainer has a modular structure and it consists of didactic panels installed on a vertical frame. It is supplied with a theoretical and practical manual.
The modularity of these didactic system grants to the students a direct and immediate approach to the topics, offering the opportunity to study various subjects performing several experiments as following:
• Single-phase full-bridge dc chopper. PWM control.
• Single-phase full-bridge inverter. Square-wave PWM control.
• Single-phase full-bridge inverter. Sinusoidal PWM control.
• Frequency converter
• Input controlled rectifier
• Output power inverter

INVERTERS

Power electronics studies the application of electronic devices to conversion and control of electrical power with the greatest possible efficiency.
In this laboratory the students can analyze the proprieties of the inverter with a PWM control.
This trainer has a modular structure and it consists of didactic panels installed on a vertical frame. It is supplied with a theoretical and practical manual.
The modularity of this didactic system grants to the students a direct and immediate approach to the topics, offering the opportunity to study various subjects performing several experiments as following:
• Single-phase full-bridge dc chopper. PWM control.
• Single-phase full-bridge inverter. Square-wave PWM control.
• Single-phase full-bridge inverter. Sinusoidal PWM control.

FREQUENCY CONVERTERS

Power electronics studies the application of electronic devices to conversion and control of electrical power with the greatest possible efficiency.
In this laboratory the students can analyze the properties of the frequency converter circuit.
This trainer has a modular structure and it consists of didactic panels installed on a vertical frame.
It is supplied with a theoretical and practical manual.
The modularity of this didactic system grants to the students a direct and immediate approach to the topics, offering the opportunity to study various subjects performing several experiments as following:
• Frequency converter
• Input controlled rectifier
• Output power inverter

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ProductsCodeCatalogueTender specsManuals SimpleVideo
DC-AC CONVERSION - INVERTER AND FREQUENCY CONVERTERSDCA 204
INVERTERSDCA 204.1
FREQUENCY CONVERTERSDCA 204.2