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參數(shù)資料
| 型號(hào)： | PW-82520R3-231 |
| 廠商： | DATA DEVICE CORP |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, 3 A, DMA41 |
| 封裝： | DIP-41 |
| 文件頁數(shù)： | 13/16頁 |
| 文件大?。?/td> | 219K |
| 代理商： | PW-82520R3-231 |
6
Data Device Corporation
www.ddc-web.com
PW-82520R
F-03/06-0
INTRODUCTION
The PW-82520R is a radiation hardened, 3-phase high perform-
ance current control (torque loop) motor controller hybrid, which
provides true four-quadrant control through zero current (Refer to
FIGURE 1. PW-82520R Block Diagram). Its high Pulse Width
Modulation (PWM) switching frequency makes it suitable for
operation with low inductance motors. The PW-82520R hybrids
can accept either 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-82520R 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-linearity 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 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-82520R'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 volt-
ages. 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 ICL limits).
BASIC OPERATION AND ADVANTAGES
The PW-82520R utilizes 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 tran-
sistors, 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 current
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 quarter 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.
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.
VBUS
PHASE A
UPPER
PHASE A
LOWER
PHASE B
UPPER
PHASE B
LOWER
Rsense
PHASE A
PHASE B
PHASE C
-
+
OFF
ON
FIGURE 2. COMPLEMENTARY 4-QUADRANT DRIVE
FIRST HALF OF PWM CYCLE
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