參數(shù)資料
型號： MC1H3
廠商： Microchip Technology Inc.
英文描述： High Voltage Power Module Users Guide
中文描述： 高壓電源模塊用戶指南
文件頁數(shù)： 18/60頁
文件大小： 1522K
代理商： MC1H3
dsPICDEM MC1H 3-Phase High Voltage Power Module
DS70096A-page 12
2003 Microchip Technology Inc.
1.2.6
Power Module Feedback Signals
1.2.6.1
INTRODUCTION
The power module may be operated in two distinct ways with respect to signal
isolation. This effects which of the feedback signals are available. All feedback signals
are preconditioned and scaled within the power module. Which particular set of
feedback signals the user requires will change depending on the application. Typically
industrial applications tend to use isolated signals for both safety, noise and
performance reasons. More cost-sensitive applications, and especially those that
have little or no user input, tend to run the control electronics live and use non-isolated
feedback signals.
1.2.6.2
ISOLATED FEEDBACK
Table 1-2 gives the scaling of the isolated feedback signals as the system is delivered.
TABLE 1-2:
ISOLATED SCALING
1.2.6.3
NON-ISOLATED FEEDBACK
As the system is delivered, access is not given to the non-isolated feedback signals to
ensure user safety. If an experienced user wishes to access these signals they should
read
Section 1.4 “Detailed Description of Operation”
along with
Section
1.5.3.4 “Accessing the Additional (non-isolated) Feedback Signals”
. Note that
once the isolation barrier is bridged, all signals can no longer be considered to be
isolated from the power circuit. When operating in the non-isolated configuration, the
Hall current sensors and SPI voltage feedback signals are also available.
The scaling for the signals as the system is delivered is given below. For details of
changing the scaling, see
Section 1.5.3 “Changing Current Feedback and Trip
Scaling”
.
TABLE 1-3:
NON-ISOLATED SCALING
Feedback Signal
Scaling
Inverter Output (R and Y) Hall Current Sensor
2.4 A/V with 2.5V = 0A
DC Input Hall Current Sensor
4.8 A/V with 2.5V = 0A
DC Bus Voltage via SPI Channel
230 = 410V (1LSB = 1.78V)
Rectified AC Voltage (|VAC|) via SPI Channel
230 = 369V (1LSB = 1.60V)
Feedback Signal
Scaling
R, Y, B Inverter Leg Shunts
2.4 A/V with 2.5V = 0A*
DC Bus Shunt
2.38 A/V with 2.5V = 0A*
Brake Chopper Shunt
1.09 A/V
DC Bus Voltage
91.0 V/V
|VAC| Voltage
81.9 V/V
R. Y, B Inverter Output Voltages
92.0 V/V
* If a large rate of change of current occurs due to the use of a load with low inductance, the
voltage across the self-inductance of the shunts will cause an additional shunt voltage
that will add to the shunt feedback signals.
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