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Tags: changer, frequency, CycloconverterAC, CycloconverterAC to AC frequency changer,
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Cycloconverter-AC to AC frequency changer
Post: #1

Abstracts: System is based in 8051 microcontroller. Power supply gives regulated 5v DC from 230V input. 2X16 LCD is there to display parameters of system on the display. Sine to square wave converter gives square wave reference input to microcontroller from 50HZ sinewave line voltage. We have connected four devices at one input of load and four devices at another input of load. At a time only one device is active out of four devices. It is on for half cycle only. Next cycle which device to switch on depends on what frequency output we want. This can be set using four switches. We can generate output at line frequency, line frequency/2, line frequency/3 etc.
Post: #2
can i get the project report.if possible please send this at ramkrishna8271[at]
Post: #3
A cycloconverter (CCV) or a cyclo inverter converts a constant voltage, constant frequency AC waveform to another AC waveform of a lower frequency by synthesising the output waveform of segments of the AC supply without a DC link intermediate (Dorf 1993, pp. 2241-2243 and Lander 1993, p.181). There are two main types of CCV, type of circulating current or blocking mode, most high-power commercial products are of the blocking mode type. SCR switching devices controlled by phase can be used throughout the CCV range, low cost and low power consumption. TRIAC-based CCVs are inherently reserved for resistive load applications. The amplitude and the frequency of the output voltage of the converters are both variables. The output ratio at the input frequency of a three-phase CCV must be less than about one third for CCVs in circulating current mode or half for CCVs in blocking mode. (Lander 1993, p.188) The quality of the output wave improves as the pulse number of the switching device jumpers in the phase shift configuration increases at the CCV input. In general, the CCV can have input / output configurations of 1 phase / 1 phase, 3 phases / 1 phase and 3 phases / 3 phases, but most applications are three phase / three phase.

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