參數(shù)資料
型號(hào)： MC1H3
廠(chǎng)商： Microchip Technology Inc.
英文描述： High Voltage Power Module Users Guide
中文描述： 高壓電源模塊用戶(hù)指南
文件頁(yè)數(shù)： 35/60頁(yè)
文件大?。?/td> 1522K
代理商： MC1H3
2003 Microchip Technology Inc.
DS70096A-page 29
Set Up and Operation
1.4.9.3
DC BUS OVER-VOLTAGE
The feedback signal derived for the DC bus voltage (see
Section 1.4.7 “Voltage
Feedback (Appendix A, Sheets 1, 6 and 7)”
) is used to detect an 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
1.4.9.2 “Inverter Shunt Over-current”
is used.
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
similar to that described in
Section 1.4.9.2 “Inverter Shunt Over-current”
.
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.
Latching and indication is identical to that described in
Section 1.4.9.2 “Inverter
Shunt Over-current”
.
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.
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