AC and DC Dummy Load All The Electronics That's Fit To Build
A dummy load is traditionally a big resistor you connect across the output of a power device when testing it. These are used to test power supply designs and instead of just chaining resistive loads together every time so the builder decided to look into building a tool for the job. It is a reliable constant current load that can be dialed.
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Step 1: Preparing a Case The Answer: A dead computer power supply! You can use any brand of ATX power supply though for internal packaging reasons, one with a small rear-mounted exhaust fan works perfectly. In my case, I was able to wrangle up a dead HP power supply that fit the bill.
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What do you use for PSU testing and for power supply circuit testing? Electronic loads are nice, but you could buy 20 resistors for the price of one of these devices, and a resistor works for AC, too, which is even more expensive for electronic loads.
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Variable Dummy Load for Power Supply Testing. How to test a voltage source to know if it is good or not?. What is the percentage regulation?.. 20 Amp Variable Power Supply with an output voltage from 1.5 to 15 volts using the LM317 regulator and 4 2N3055 power transistors to amplify the current capacity.
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EEVblog #102 - DIY Constant Current Dummy Load for Power Supply and Battery Testing. EEVblog August 1, 2010 EEVblog, EEVblog - Podcast Comments Off 52,099 Views. Dave grabs a few junkbox parts and builds a useful constant current load for switch mode power supply, battery testing, and other applications. Podcast: Download.
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You can test power supplies and related devices at maximum peak output current without resorting to arrays of power resistors, using this dummy load circuit, which is nothing but a simple transistor current sink circuit.
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February 11, 2020 When it comes to testing power supplies, it's useful to have a dummy load to put the gear through its paces. While it's possible to just use some old heating elements or.
EEVblog 102 DIY Constant Current Dummy Load for Power Supply and
To test real capacity of a power supply, we need a load with variable current consumption. If we have high power variable resistor such as tapped wire-wound resistor, we can directly connect this resistor and make some measurement. Unfortunately, this kind of high power resistor is expensive and not so flexible getting wide adjustment range.
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This variable dummy load is helpful in power supply testing by providing virtual load which can be adjusted to draw certain current. It act like a high power variable resistor but.
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The best way to test the correct operation of a circuit is to test it whilst it is under the expected load range. For purely resistive circuits with minimal voltage fluctuations, this can easily be done by placing a suitable valued resistor across the voltage potential.
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3 I'm working on a power supply build and need a dummy load. I've found many mentions here that are good for a few amps, but I need one that's good for 30A or more. at 5V. I thought about just using some high wattage LEDs or something but they all require 30V or more. Being variable isn't a hard requirement but would be nice.
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I made my dummy load switchable. You can draw a big current and then by flipping the switch the current almost doubles. The lowest resistance I got from this circuit was 1.8 Ohms. That means with 12 volts connected you can draw a little under 7 Amps. and this transistor has no troubles with that (provided the heat-sink is up to it).
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If they we're perfectly equal (they aren't) this means I made a 0.2ohm 2.5W resistor. sqrt (2.5/0.2) = 3.54A would be the limit current in theory but remember that one resistor might be more stressed than the others because it has more resistance (R*I^2 for constant current, so the bigger the R, the worse for the poor resistor). Note:
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Variable Dummy Load for Power Supply Testing It is easy to find on the Internet many designs of voltage sources, with which we can power our circuits designs. It would be very useful to know how to test a voltage source in order to determine if its characteristics are good or not.
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All you need to do is clip a multimeter across the big current sense resistor, and as it is 1 Ohm, then 100 mV on the meter will represent 100 mA current. It seems to work pretty well. I could only get the lower limit down to around 20 mA but the op-amp wasn't a rail-to-rail one.
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You use an active-load test circuit to ensure that a power supply for a microprocessor or for other digital loads supplies 100A transient currents. This active load can provide a dc load for a power supply, and it can rapidly switch between dc levels. These transient loads simulate the fast logic switching in the microprocessor.
