How to Test IGBT Bricks - DMM Test & Lamp Test

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How to Test IGBT Brick Modules with a Multimeter (DMM) and test IGBTs with a Lamp & Battery.
IGBT Test with the Digital Multimeter is useful when the IGBT module cannot easily be removed or isolated.
Lamp & Battery test for when the IGBT can be removed or isolated.
See end of video for diagrams.

IGBT Battery Lamp Test:

- Wire lamp in series with 12v battery and IGBT polarity respective.
Negative of battery to E, Positive of battery to lamp, other side of lamp to C.
- Touch positive of battery and gate to turn on.
- Touch negative of battery and gate to turn off.
* Note touch battery first as IBGTs are ESD sensitive and can be damaged.



IGBT Digital Multimeter (DMM) Test Procedure:

Collector-Emitter Junction test:
- With the module out of circuit remove the conductive foam and short the gate to emitter.
- With DMM in diode check mode, the collector to emitter should give a normal diode reading with positive on the emitter and negative on the collector.
- The DMM should read open or infinite with positive on the collector and negative on the emitter. Damaged IGBTs may test as shorted in both positive and negative directions, open in both directions, or resistive in both directions.
Gate test: With the DMM in resistance mode the resistance from gate to collector and gate to emitter should read infinite on a good device. A damaged device may be shorted or have resistive leakage from gate to collector and/or emitter.

SCR Powerblock Tester

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https://youtu.be/k2V-OE3VEXQ SCR Tester Circuit Diagram

This prototype device tests the Gate Trigger Current (IGT), Latching Current (IL) and Holding Current (IH) of Powerblock SCR Modules (Thyristors). 

The dial, led indicator and amp panel on the left are for the gate trigger and current. The dial, led indicator and amp panel on the right are for the A/K Latch and Hold Current.  
When the trigger button is pressed current must be increased with the dial until the right led lights - that is the required Gate Trigger Current displayed on the amp panel.
Now the A/K load current must be increased until the right led lights and stays on after the trigger is released. Then the SCR is latched in the On state and the current displayed on the amp panel is the required Latching Current (IL). Current can be lowered down to the Holding Current (IH) for the specific SCR under test and still stay in the On state (check data sheets). If current falls below (IH) the SCR will turn off.

This prototype was made since I couldn't find such a product on the market to test large Powerblock SCRs requiring high IGT and IL currents. 

Next project after I make the final polished version of this tool is an (IPM) Intellimod IGBT tester.

Edit: 2014_04
120vac input to regulated 48VDC supply. Wire wound variable resistors for dials. This unit is designed to deliver only a few amps max.

DIY Magnet Pole Tester Hall Effect Sensor

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DIY battery powered Magnet Pole Tester. I lost the AMY6 Magnet Tester I purchased so I decided to just build one. A circuit diagram is in the video.

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Materials:
APX9141 Hall Effect Sensor,
3V Battery,
Red LED,
Blue LED,
Momentary Pushbutton Switch,
Breadboard, 
56 Ohm Resistor,
Hookup Wire,

Magnetic Polarity Detector Trial Test

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Trial test of a Magnetic Polarity Detector using a hall effect sensor (APX9141) and indicator LEDs. This is just a test before I build a battery powered pen sized Magnet Pole Tester. I lost the AMY6 Magnet Tester I purchased so I decided to just build one. A circuit diagram is in the video.

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How To: Safely Discharging a Capacitor Bank

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How to safely discharge a capacitor bank.
A method to discharge large capacitor banks with an insulated high wattage resistor. This resistor and method is used to discharge large 700vdc 30+ capacitor elevator banks. The banks have two 35k ohm bleeder/balance resistors but they can take some time to discharge and in many cases can't overcome the dielectric absorption (battery action) which can be significant on larger drives I clip this discharge resistor and leave it on while work is performed.


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