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參數(shù)資料
| 型號： | PWR-82521-140 |
| 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, 18 A, DMA41 |
| 封裝： | DIP-41 |
| 文件頁數(shù)： | 7/12頁 |
| 文件大?。?/td> | 150K |
| 代理商： | PWR-82521-140 |
4
June 1, 2000; Data Device Corp.
VBUS
PHASE A
UPPER
PHASE A
LOWER
PHASE B
UPPER
PHASE B
LOWER
Rsense
PHASE A
PHASE B
PHASE C
-
+
OFF
ON
I
FIGURE 2A. COMPLEMENTARY 4-QUANDRANT DRIVE
FIRST HALF OF PWM CYCLE
VBUS
PHASE A
UPPER
PHASE A
LOWER
PHASE B
UPPER
PHASE B
LOWER
Rsense
PHASE A
PHASE B
PHASE C
+
_
ON
OFF
I
FIGURE 2B. COMPLEMENTARY 4-QUANDRANT DRIVE
SECOND HALF OF PWM CYCLE
The ENABLE input signal provides quick start and shutdown of
the output power switches. In addition, built-in power sequence
fault protection turns off the output in case of low power supply
voltages.
The hybrid features dual current limiting functions. The input
command amplifier output is limited to 10.8V thus limiting the
current under normal operation. In addition, there is a built in
over current limit which trips at 18 Amps, protecting the hybrid as
well as the load.
BASIC OPERATION
The PW-82521 utilizes a complimentary four-quadrant drive
technique to control current in the load.
The complimentary
drive has the following advantages over the standard drive:
1. Maximum holding torque and position accuracy
2. Linear current control through zero
3. No deadband at zero
The complementary drive design uses a 50% PWM duty cycle
for a zero command signal. For a zero input command, a pair of
MOSFETs are turned on in the drive, Phase A upper & Phase B
lower as shown in FIGURE 2A, to supply current into the load for
the first half of the PWM cycle. This is the same mode of oper-
ation for the standard 4-quadrant drive as shown in FIGURE
3A/B. During the second half of the PWM cycle, a second pair
of transistors are turned on, Phase A lower & Phase B upper as
shown in FIGURE 2B, for the flyback current and to provide load
current in the opposite direction.
This is normally the dead time for standard 4-quadrant drive as
shown in FIGURE 3B. The result is current flowing in both direc-
tions in the motor for each PWM cycle. The advantage this has
over standard 4-quadrant drive is that at 50% duty cycle, which
corresponds to zero average current in the motor, holding torque
is provided. The motor current at 50% duty cycle is simply the
magnetizing current of the motor winding.
Using the complimentary 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 rota-
tion. 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-82521 contains all the circuitry required to close an
average current mode control loop around a complimentary 4-
quadrant drive. The PWR-82521 use of average current mode
control simplifies the control loop by eliminating the need for
slope compensation and eliminating the pole created by the
motor inductance. These two effects are normally associated
with 50% duty cycle limitations when implementing standard
peak current mode control.
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