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Set Up and Operation
1.4.9.3
DC BUS OVER-VOLTAGE
condition. The threshold is set at approximately 410V in order to protect the power
devices and the DC bus capacitors. A similar circuit as described in Section
1.4.9.4
BRAKE OVER-CURRENT
The feedback signal derived from the brake chopper shunt is used to detect an
over-current. The threshold is set at 6.1 A. The circuitry used to implement the trip is
1.4.9.5
HEAT SINK OVER-TEMPERATURE
To protect the power devices from thermal overload, a heat sink temperature trip is
included. The trip temperature is set at nominal value of 65°C (150F) The circuitry
used to implement this is described below:
? U1 – A Microchip TC622EAT temperature trip IC. This IC only requires an external
resistor (R34) to set the nominal trip temperature. As the version chosen is
packaged in a TO220, this is easily mounted along with the other power devices
to the heat sink. This ensures excellent thermal coupling. As the tab of the device
is not isolated, a thermally conductive insulator is used.
? R116 and C42 – These filter the output of U1 to prevent false tripping due to
noise.
1.4.9.6
HALL OVER-CURRENT
The signals from the three Hall effect current transducers are used to provide
protection against overload, wiring and earth (ground) faults. The two inverter output
Hall effect sensors (U3 and U4) are checked for both positive and negative current.
The DC input Hall effect sensor (U2) is only checked for positive current for obvious
reasons. The circuitry to implement the trip is shown on Appendix A, Sheet 6. Being
similar to that described in Section 1.4.9.2 “Inverter Shunt Over-current” , it
requires little further explanation. The one difference is that the input signals to the
comparator are divided down in order to stay within the input voltage limitations of the
comparators when running from +5V.
? 2003 Microchip Technology Inc.
DS70096A-page 29
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