Three Phase
Circuits
Last Updated on:
Monday, October 03, 2011 06:07 PM |
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Links to electronic circuits,
electronic schematics, designs for engineers, hobbyists, students & inventors:
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$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] |
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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] |
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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] |
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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] |
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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. |
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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] |
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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] |
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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. |
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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] |
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Three Phase Basics - Get an understanding of three phase wiring in wind
turbine alternators…. [REUK - Renewable Energy UK website] |
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Three Phase Bridge Rectifier - Find out about three phase bridge
rectifiers…. [REUK - Renewable Energy UK website] |
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Three Phase Voltage Multiplier - The Cockcroft-Walton turbine voltage
multiplier…. [REUK - Renewable Energy UK website] |
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| Three Phase
Circuits |
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