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Registered Member #195
Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
When a fault is generated in sync with zero crossing how much is shut down. In other words is the burst shut down or is the the offending pulse stopped, or is the whole tesla shut down to await a manual reset. How does the forum aproch a fault generation. Thanks N.B.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Different people do it different ways. This is my fault detecting logic:
If the primary current rises over the (user set) limit during a burst, the gate drive is stopped until the current falls below the limit again. So the gate drive pulses on and off to keep the current within bounds.
If the power supply to the gate driver stage or any of the other circuitry falls too low, the gate drive is stopped and won't restart until the voltage rises again (to a few volts higher than the voltage that makes it trip out)
My PLL driver only allows the gate drive to be started or stopped at positive zero crossings of the primary current. So it basically dishes it out in units of one cycle.
When I add isolated gate drivers for large IGBTs, I'll use optoisolators to monitor their supply rails and, again, shut the gate drive off if any show a fault.
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
teravolt wrote ...
When a fault is generated in sync with zero crossing how much is shut down. In other words is the burst shut down or is the the offending pulse stopped, or is the whole tesla shut down to await a manual reset. How does the forum aproch a fault generation. Thanks N.B.
It depends on a number of things including personal preference and the system it is being used in. Overcurrent monitoring may have several different thresholds and scenarios it shuts down. Some may wish to latch in faults (especially if there are many being monitored) so a user can inspect them and then reset them. Some faults can be tripped and reset on a cycle by cycle basis, while others on a burst by burst basis.
It all comes down to a number of things including personal tastes, overall complexity, and the minimum fault detection that may be required for a particular design.
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fault synchronization
