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By Valery Vodovozov

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In contrast, in a common emitter configuration, the drivers of each switch have to use an isolated supply; however, one driver for both IGBTs is sufficient if separate control of current direction is not required. Another approach is to use the novel semiconductor device – reverse blocking IGBT. It behaves like an IGBT, but provides blocking capability for applied reverse voltage. An anti-parallel connection of two of those devices according to Fig. 24, c, operates as bi-directional, bipolar switch.

Thereat, instead of a CSI, in electric drives the VSI are used as a current source in which an appropriate current feedback arrangement is used. com 45 Introduction to Power Electronics Power Electronic Converters In resonant inverters, the controllable switches turn on and off at zero voltage and/or zero current that opens the way to the frequency increasing. Therefore, less volume is required for the converters and reactive components can be reduced in size, resulting in design that is more compact and attracting the attention of portable drive designers.

27, a, the converter output voltage measured by the voltage sensor is compared with its reference value using the comparator. The comparator output represents the switching function whose pulse width regulates the output of the converter. com 62 Introduction to Power Electronics Power Electronic Converters A circuit that is capable of two-quadrant operation is depicted in Fig. 27, b. During the first phase, the converter operates as the basic chopper with VT1 carrying the current. The current flows through the load while the transistor VT1 is in on state.

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Introduction to Power Electronics by Valery Vodovozov

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