HIGH PERFORMANCE BRUSHLESS DC MOTOR DRIVER
BC10/BC20
M I C R O T E C H N O L O G Y
HTTP://WWW.APEXMICROTECH.COM
(800) 546-APEX
(800) 546-2739
PRELIMINARY
FEATURES
鈥?10V TO 500V MOTOR SUPPLY AT 20 A CONTINUOUS
AND 40 A PEAK OUTPUT CURRENT, BC20
鈥?10V TO 100V MOTOR SUPPLY AT 10 A CONTINUOUS
AND 20 A PEAK OUTPUT CURRENT, BC10
鈥?OPERATION WITH 10.8V TO 16V VCC, ALLOWING
NOMINAL 12V OR 15 V VCC SUPPLIES
鈥?THREE PHASE FULL BRIDGE OPERATION WITH 2 OR
4 QUADRANT PWM
鈥?AUTOMATIC BRAKING WHEN USING 2 QUADRANT PWM
鈥?THERMAL PROTECTION
鈥?TOP AND BOTTOM RAIL SHORT CIRCUIT PROTECTION
鈥?ANTI SHOOT THROUGH DESIGN
鈥?50 KHZ INTERNALLY SET PWM FREQUENCY, WHICH
MAY BE LOWERED WITH EXTERNAL CAPACITOR S
鈥?SELECTABLE 60擄 OR 120擄 COMMUTATION SEQUENCES
鈥?COMMUTATION TRANSITIONS OUTPUT FOR DERIVING
SPEED CONTROL
鈥?MAY BE USED OPEN LOOP, OR WITHIN A FEEDBACK
LOOP
鈥?ANALOG MOTOR CURRENT MONITOR OUTPUT, MAY BE
USED FOR TORQUE CONTROL OR FOR
TRANSCONDUCTANCE AMPLI鏗丒R DRIVE.
鈥?ANALOG REFERENCE, FEEDBACK, AND TORQUE INPUTS
DESCRIPTION
The BC10 and BC20 Brushless DC Motor Controllers provide
the necessary functions to control conventional 3 phase brushless
dc motors in an open loop or closed loop system. The BC10 is able
to control motors requiring up to 1 kW continuous input power; the
BC20 is able to control larger motors requiring up to 10 kW
continuous input power.
Both controllers drive the motors, generate the PWM, decode
the commutation patterns, multiplex the current sense, and pro-
vide error ampli鏗乧ation. Operation with either 60擄 or 120擄 commu-
tation patterns may be selected with a logic input.
Current sense multiplexing is used to make the current monitor
output always proportional to the active motor coils current.
Therefore the current monitor output may be used in generating
transconductance drive for easy servo compensation.
The controller may generate 4-quadrant PWM for applications
requiring continuous transition through zero velocity, or 2 quad-
rant PWM for electrically quieter operation in unidirectional appli-
cations. Direction of rotation may be reversed in 2-quadrant mode
by using the reverse command input. When in 2-quadrant mode
if the motor is stopped or decelerating dynamic braking is auto-
matically applied. In this way deceleration pro鏗乴es may be fol-
lowed even when
VCC
HV
HV
using 2-quadrant
PWM.
V+
TOP DRIVE 1
1/2
BRIDGE
1
OUT 1
S1
APPLICATIONS
鈥?3 PHASE BRUSHLESS MOTOR CONTROL
SSC
2Q
OE
HS1
HS2
HS3
120
REV
REF IN
+
BOTTOM DRIVE 1
COMMUTATION
DECODE
LOGIC
BRIDGE
CONTROL
LOGIC
V+
PWM
COMPARATOR
PWM
TOP DRIVE 2
BOTTOM DRIVE 2
1/2
BRIDGE
2
OUT 2
S2
鈥?/div>
FB
鈭?/div>
+
鈭?/div>
鈥?/div>
TEMP
SENSING
OVERTEMP
SHUTDOWN
TOP DRIVE 3
V+
BOTTOM DRIVE 3
1/2
BRIDGE
3
OUT 3
S3
POWER
FAULT
LOGIC
PWM
OSCILLATOR
OVERCURRENT
CURRENT
SENSING
SIGNAL
CONDITIONING
HV RTN
HV RTN
BLOCK DIAGRAM
TORQUE
CT
FAULT
MOTOR I
GROUND
APEX MICROTECHNOLOGY CORPORATION
鈥?TELEPHONE (520) 690-8600 鈥?FAX (520) 888-3329 鈥?ORDERS (520) 690-8601 鈥?EMAIL prodlit@apexmicrotech.com
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