Relay Suppression Diode Failure
- From: Mark P <marketmark@xxxxxxxxxx>
- Date: Mon, 18 Jun 2007 15:36:03 -0400
I trying to determine the cause of a relay suppression diode failure.
The diode is built into the relay can (T-05 type) and is a standard
switching type diode - according to the manufacturer. The relay coil
specs: L=600mH and R=850 ohms. The relay was driven with a 2 second
ON pulse followed by 2 seconds OFF. This duty cycle was continued for
three minutes. The relay was driven with a transistor switch on the
low side. The voltage on the coil was 13V. The relay failed and after
it was opened up you could see that the diode was cooked.
When the transistor switch turns OFF the diode suppresses the voltage
transient. Is there sufficient energy dissipated in the diode over 3
minutes to cause it to fail? Is there a way to calculate or estimate
the diode junction temp rise? The manufacturer has no thermal data on
the part.
.
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