參數(shù)資料
型號(hào)： 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(yè)數(shù)： 27/60頁(yè)
文件大小： 1522K
代理商： MC1H3
2003 Microchip Technology Inc.
DS70096A-page 21
Set Up and Operation
D3 – A 8A 600V diode required to freewheel the current around the resistor due to
it's inductance. As the tab of the device is not isolated, a 3W 25m
shunt resistor
through which the low side switch and diode returns to the -DC bus. The shunt is
used for FAULT protection and (optionally) for an alternative feedback signal, see
Section 1.4.6 “Shunt Feedback (Appendix A, Sheet 3)”
and
Section
1.5.3.4 “Accessing the Additional (non-isolated) Feedback Signals”
.
U23 – Microchip TC1412N gate drive IC. This contains a low resistance
complementary push-pull MOSFET pair and input circuitry suitable for interfacing
to a wide range of input voltages. It has a small footprint allowing it to be located
physically close to the transistor, allowing a low inductance gate circuit layout.
Note that the full current drive capability of the TC1412N is not necessarily
required, as high frequency modulation is not essential for a brake chopper. A less
expensive TC1410N or TC1411N could be used.
R60, R62, R67, Q12, C24, C28 – These components act to provide a dynamic
level shifting circuit to U23 while Q10 switches. Inductance of the power tracking
between the emitter of Q10 due to the physical board layout means there is a
substantial transient voltage (up to 2V in this case) between the +15V supply star
point reference and the emitter of Q10. This simple low cost circuit allows the
power supply of U23 to move transiently. Q12 provides a level shift to ensure
correct assertion of the firing command. In applications with fewer constraints on
physical layout and/or lower switching speed requirements, these components
may not be needed.
Brake Resistor – A 50W metal clad 4K7
resistor mounted to the heat sink is
connected to pads J7 and J8. The value of the resistor has been chosen to allow
a maximum dissipation of 40W. If the user wishes to be able to dissipate more
power, then an external resistor can be connected to pins 6 and 7 of the 7-pin
output connector. This will operate in parallel with the internal resistor. If the user
wishes to change the value of the internal resistor or disconnect it, they should
read
Section 1.5.3.2 “Modifying or Removing the Internal Braking Resistor”
.
1.4.5
Isolated Current Feedback (Appendix A, Sheets 1 and 2)
In order to provide isolated current feedback, Hall effect closed loop DC current
transducers (LEM LTS 6-NP) devices have been installed. These devices have the
following characteristics:
Single 5V supply with 2.5V (nominal) representing 0A
Bipolar current sensing with ±19.2A given by 4.5V and 0.5V respectively with a
single turn through the transducer.
>200 kHz bandwidth
3 kV AC isolation
A detailed device data sheet can be obtained from www.lem.com.
Two such devices (U3 and U4) are installed in series with the output connections of
phases R and Y. These are configured to have 4 turns through the device with LK 15
and 18 installed and an additional turn formed by the internal output leads. This gives
a maximum sensed current of ±4.8A and a gain of 2.4A/V. Note that a third device is
not required, as the sum of the output line currents must always be zero due to
symmetry. The one exception to this is during a ground FAULT condition that is
detected elsewhere.
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