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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)： | 29/60頁 |
| 文件大?。?/td> | 1522K |
| 代理商： | MC1H3 |
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2003 Microchip Technology Inc.
DS70096A-page 23
Set Up and Operation
1.4.6.2
INVERTER LEG SHUNT RESISTOR FEEDBACK
A shunt is located between the emitter of the low side switches (e.g., Q4) and the -DC
bus in every leg of the inverter. A simple differential amplifier circuit is used as shown
in Appendix A, Sheet 3. The operation of the circuit used for the RED phase leg is
described below:
U24-A – One quarter of the MC6024 op amp.
R94, R99 and C34 – These provide a small amount of passive differential filtering.
This helps to reduce input stage overloading of the op amp that would occur due
to spikes of voltage produced by the shunt's self-inductance. Clearly, this has a
beneficial effect on the output signal.
R84, R85, R88 and R89 – The resistors form the differential configuration of the
amplifier.
LK5 and LK6 – These allow two different gain settings to be used by shorting out
R85 and R89. Note that both links must be used together for correct operation.
LK4 – Provision is made for either bipolar or unipolar sensing by changing this
link. It changes the non-inverting input reference point between 2.5V and 0V.
Bipolar sensing is required for applications using sinusoidal modulation, whereas
unipolar sensing is sufficient for other applications.
Other points to note:
No common mode filtering has been used, as the amplifier's inherent common
mode rejection is sufficient and it requires tight tolerance components to be
effective.
Note that the output of the op amp is not glitch-free during switching transitions,
but tracks the current rapidly. It is assumed that suitable synchronization of the
sampling of the output is used to reject the glitches.
The self-inductance of the shunts (approx. 10nH) causes an additional voltage to
be produced proportional to the rate of change of current. For typical motors, this
additional voltage is negligible, as the inductance is high enough to ensure a low
rate of change of current. If a low inductance load is used, the effect of the
additional voltage will have to be compensated for in the user's software.
1.4.6.3
DC BUS SHUNT RESISTOR FEEDBACK
In addition to the three inverter leg shunts, provision has been made to monitor the
current in the -DC bus. In many applications, the information contained in this signal
alone is sufficient to provide the required closed loop control. The operating range and
the quality of control will dictate whether a bus shunt alone can be used. Clearly, it is
the cheapest of all schemes to implement.
The current that the shunt has flowing in it at any given time depends on the state of
all three inverter legs. It should be recalled that having both switches in the same leg
on at the same time is not allowed. The top switch being off (Top Fire = 0) assumes a
bottom switch is on. It does not matter whether the current actually flows in the switch
or the anti-parallel diode. The result depends only on the magnitude and direction of
the output currents, see Table 1-5.
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| MC1LKN0800 | 功能描述:環(huán)形公制連接器 M40 C Straight Recpt 8 Position RoHS:否 制造商:3M Electronic Solutions Division 產(chǎn)品類型:Connectors 系列:M12 外殼類型:Plug 觸點數(shù)量:4 安裝風格:Cable 端接類型:Solder Cup 電流額定值:4 A |
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