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Three Phase Circuits
Last Updated on:
Wednesday, July 16, 2014 06:35 AM

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

$5 junkbox Circuit Determines Phase Sequence  -  04/23/98 EDN-Design Ideas....Have you ever wondered which way a blower motor is going to turn when you plug it into anor socket, or have you ever inherited  task of modifying three-phase wiring in your plant?....[Note  File contains multiple circuits scroll to find this circuit.]   [Design Idea by Hugh Adams, Fort Walton Beach, FL]
60 Hz modulator records process variables -  02/16/98 EDN-Design Ideas....The circuit in Figure 1 allows you to record process variables (4 to 20 mA,0 to 10V dc]on a three-phase power monitor designed to record only ac waveforms. Many of se recorders have a seventh channel.... [Design Idea by Warren Jochem, Research Triangle Institute, Research Triangle Park, NC]
Circuit eases three-phase monitoring -  12/17/98 Issue of EDN   Measuring line-to-line voltages in a delta-connected three-phase system can present special problems. Because all three lines may be floating several hundred volts above ground, you can not use nonisolated,....Page includes several designs.  Scroll to find this one.... [Design Idea by Henno Normet, Tavares, FL]
Inverters form three-phase VCO -  2-Aug-01 Issue of EDN  You sometimes need an inexpensive VCO that can produce evenly spaced three-phase outputs over a wide frequency range. You could use tracking all-phase filters with only one oscillator, but this technique is difficult to implement and offers limited range. Other methods, such as using a DSP, are feasible, but they're complex and expensive.... [Design Idea by Al Dutcher, AL Labs, West Deptford, NJ]

Level shifting nixes need for dual Power Supply -  01/06/00 EDN-Design Ideas....The AD736 true-rms-to-dcconverter is useful for many applications that require precise calculation of the rms value of a waveform.  This converter can determine the true rms value, the average rectified value, or the absolute value of a myriad input wavefo.... EDN is migrating links. This link is not verified.  Search the "title" + "EDN" for new link.
Optocoupler simplifies power-line monitoring -  10-Jan-02 Issue of EDN  The use of a linear optocoupler and a capacitor-based power supply yields a simple, yet precise power-line-monitoring system. The circuit in Figure 1 converts the 110V-ac power-line voltage to an ac output voltage centered at 2.5V, covering 0 to 5V. The circuit isolates the output signal from the power line.... [Design Idea by Alfredo del Rio and Ana Cao y Paz, University of Vigo, Spain]
Phase Coupler for PLC or X10 Network -  As long as the AC power grid does not carry too much interference, power line carrier communications (PLC) works very well in homes with single-phase AC. Unfortunately, this is not the case with a 3-phase installation. If the transmitter and receiver find themselves on different phases, they cannot communicate!….must register on this site.... [Published in Elecktor July/August 2010]
RF Transmitter uses AMI encoding -  11/24/99 EDN-Design Ideas....Although alternate-mark-inversion (AMI]encoding is well-suited for direct-conversion FM transmission, designers often overlook the technique. AMI, a three-phase, synchronous-encoding technique, uses bipolar pulses to represent logic ones and no signal to.... EDN is migrating links. This link is not verified.  Search the "title" + "EDN" for new link.
Self-modifying code extends addressing-mode -  12/17/98 Issue of EDN  As just about any assembly-language programmer knows, self-modifying code (SMC) is usually undesirable, unintentional, and destructive. However, the SMC routine in Listing 1 is extremely useful to extend the indexed, 16-bit offset addressing mode of the venerable HC05 µC from 8 bits, or 256 locations, to the full 13-bit (8-kbyte) memory address space....Page includes several designs.  Scroll to find this one.... [Design Idea by Paul Sofianos, Motorola Inc, Tempe, AZ]
Three Phase Basics -  Get an understanding of three phase wiring in wind turbine alternators…. [REUK - Renewable Energy UK website]
Three Phase Bridge Rectifier -  Find out about three phase bridge rectifiers…. [REUK - Renewable Energy UK website]
Three Phase Voltage Multiplier -  The Cockcroft-Walton turbine voltage multiplier…. [REUK - Renewable Energy UK website]

Three Phase Circuits

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