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參數(shù)資料
| 型號(hào)： | PW-82520N1-890 |
| 英文描述： | Industrial Control IC |
| 中文描述： | 工業(yè)控制IC |
| 文件頁數(shù)： | 6/16頁 |
| 文件大?。?/td> | 191K |
| 代理商： | PW-82520N1-890 |
6
Data Device Corporation
www.ddc-web.com
PW-82520/21N
A-11/01-1000
INTRODUCTION
The PW-82520/21N is a 3-phase high performance current con-
trol (torque loop) motor controller hybrid, which provides true
four-quadrant control through zero current (Refer to FIGURE 1.
PW-82520/21N Block Diagram). Its high Pulse Width Modulation
(PWM) switching frequency makes it suitable for operation with
low inductance motors. The PW-82520/21N hybrids can accept
single-ended or differential mode command signals. The current
gain can be easily programmed to match the end user system
requirements. The addition of an externally wired compensation
network provides the user with optimum control of a wide range
of loads.
The PW-82520/21N uses single point current sense technology
with an internal non-inductive hybrid sense resistor (Rsense),
which yields a highly linear current output over the full -55°C to
+125°C military temperature range. The output current non-lin-
earity is less than 1.5% and the total error due to all the factors
such as offset, initial component accuracy, etc., is maintained
well below 3% of the full-scale rated output current.
The Hall sensor interface for current commutation has built-in
decoder logic that ignores illegal codes and ensures that there is
no cross conduction.The Hall sensor inputs are internally pulled
up to +5V and they can be driven from open-collector outputs.
The PWM frequency can be programmed externally by adding a
capacitor from PWM OUT to PWM GND. Multiple PW-82520N's
can be synchronized in two ways: 1) by using one device as a
master and connecting its PWM OUT pin to the PWM IN of all
the other slave devices, or 2) by applying a master SYNC pulse
from an external source to the PWM IN pins on all devices to be
synchronized.
The ENABLE input signal provides quick start and shutdown of
the internal PWM. In addition, built-in under-voltage fault protec-
tion turns off the output in case of improper power supply voltages.
The hybrid features dual current limiting functions. The input
command amplifier output is limited to ±5V, limiting the motor
current under normal operation. In addition, there is a cycle-by-
cycle current limit which kicks in to protect the hybrid as well as
the load (see TABLE 2 for
I
CL
limits).
BASIC OPERATION AND ADVANTAGES
The PW-82520/21N uses a complementary four-quadrant drive
technique to control current in the load. The complementary
drive has the following advantages over standard drives:
1. Holding torque in the motor at zero commanded current
2. Linear current control through zero
3. No deadband at zero
The complementary drive design produces a 50% PWM duty
cycle in response to a zero current command. During a zero cur-
rent command the benefit of a complementary 4 quadrant drive
over a standard 4 quadrant is as follows:
COMPLEMENTARY (FIGURES 2, 3A)
Complementary Drives produce a bi-directional holding torque
by driving a balanced bi-polar current into the motor that has an
average value of zero.
During the first quarter of the PWM cycle (starting at time zero
on FIGURE 3A) the MOSFET's, PHASE A UPPER (UA) and
PHASE B LOWER (LB) (FIGURE 2), are turned on. This allows
current flow from phase A to phase B to increase to +Imax.
During the second quarter of the PWM cycle, the first pair of
transistors, UA and LB are turned off and a second pair PHASE
A LOWER (LA) & PHASE B UPPER (UB) (FIGURE 2) are turned
on. This allows the current in phase A & B from the previous
quarter cycle to decrease from Imax to zero. The average cur-
rent during the first two-quarter cycles is positive.
During the third quarter of the PWM cycle, the second pair of
switches UB & LA remain on allowing current to flow, in the neg-
ative direction, from phase B to phase A and increase to –Imax
as shown in FIGURE 3A.
During the fourth quarter of the PWM cycle, the first pair of
switches UA & LB are turned on while the second pair of switch-
es UB & LA are turned off, to allow the current in the inductor to
decrease to zero.
The average current in the phases for the third and fourth quar-
ter cycles is negative.
The positive current (phase A to B) in the first two-quarter cycles
produces a torque in one direction and the negative current
(phase B to A) in the third and fourth quarter cycles produces a
torque in the opposite direction. The average of the two oppos-
ing torques results in a net zero or holding torque.
V
BUS
PHASE A
UPPER
PHASE A
LOWER
PHASE B
UPPER
PHASE B
LOWER
Rsense
PHASE A
PHASE B
PHASE C
-
+
OFF
OFF
ON
ON
FIGURE 2. COMPLEMENTARY 4-QUADRANT DRIVE
FIRST HALF OF PWM CYCLE
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