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參數(shù)資料
| 型號： | PW-82520R0NEW |
| 英文描述： | Controllers. Torque Loop|3-Phase Torque Controller. Small Plug In Hybrid |
| 中文描述： | 控制器。扭矩環(huán)| 3相轉(zhuǎn)矩控制器。小型插入式混合動力 |
| 文件頁數(shù)： | 7/16頁 |
| 文件大?。?/td> | 191K |
| 代理商： | PW-82520R0NEW |
7
Data Device Corporation
www.ddc-web.com
PW-82520/21N
A-11/01-1000
UA
LA
UB
LB
0
Drive Switches and Phase Current vs. Time
FIGURE 3B. STANDARD 4-QUADRANT DRIVE
PWM CYCLE
ON
OFF
ON
OFF
ON
OFF
ON
OFF
S
P
Time (half phase)
1
2
3
4
UA
LA
UB
LB
0
Drive Switches and Phase Current vs. Time
ON
OFF
ON
OFF
ON
OFF
ON
OFF
P
S
Time (quarter phase)
1
2
3
4
1
2
3
4
FIGURE 3A. COMPLEMENTARY 4-QUADRANT DRIVE
PWM CYCLE
NON-COMPLEMENTARY (FIGURES 2, 3B)
Non-Complementary Drives produce a unidirectional torque by
applying a unipolar current into the motor that has an average
positive value as shown in FIGURE 3B.
During the first half of the PWM cycle the MOSFET's, Phase A
upper and Phase B lower, are turned on to provide current into
the phases.
During the second half of the PWM cycle the drive is in dead
time, all transistors are turned off, the motor current continues to
flow in the same direction through the device diodes, until it
decays to zero.
Current flowing in to and out of the phases produces a net torque
in one direction.
MAJOR ADVANTAGES
The advantage of a complementary 4-quadrant drive over a
standard 4-quadrant drive is that it provides holding torque dur-
ing a zero current command. The motor current at 50% duty
cycle is simply the magnetizing current of the motor winding.
Using the complementary 4-quadrant technique allows the motor
direction to be defined by the duty cycle.
Relative to a given switch pair, i.e. Phase A upper and Phase B
lower, a duty cycle greater than 50% will result in a clockwise
rotation whereas a duty cycle less than 50% will result in a
counter clockwise rotation. Therefore, with the use of average
current mode control, direction can be controlled without the use
of a direction bit and the current can be controlled through zero
in a very precise and linear fashion.
The PW-82520N contains all the circuitry required to close an
average current mode control loop around a complementary 4-
quadrant drive. The PW-82520N use of average current mode
control simplifies the control loop by eliminating the need for
slope compensation and by eliminating the pole created by the
motor inductance. Slope compensation and the pole created by
the motor inductance are two limitations normally associated
with implementing standard 4 quadrant current mode controls.
FUNCTIONAL AND PIN DESCRIPTIONS
VBUS+A, VBUS+B, VBUS+C
The VBUS+ supply is the power source for the motor phases.For
the PW-82520 (PW-82521) series device, the normal operating
voltage is 28Vdc (100Vdc) and may vary from +18 (+36) to
+70Vdc (+140Vdc) with respect to VBUS-. The power-stage
MOSFETs in the hybrid have an absolute maximum VBUS+ sup-
ply voltage rating of 100V (200V).The user must supply sufficient
external capacitance or circuitry to prevent the bus supply from
exceeding the maximum recommended voltages at the hybrid
power terminals under any condition.
POWER-ON SEQUENCE (
IMPORTANT!
)
The VBUS+ should be applied at least 50ms after V
DD
and V
EE
to allow the internal analog circuitry to stabilize. If this is not pos-
sible, the hybrid must be powered up in the "disabled" mode.
VBUS-
This is the high current ground return for VBUS+.This point must
be closely connected to SUPPLY GND for proper operation of
the current loop.
VCC (+5V SUPPLY) AND VCC RTN
These inputs are used to power the digital circuitry of the hybrid.
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