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BC05 Schematic ( PDF Datasheet ) - Apex Microtechnology Corporation

Teilenummer BC05
Beschreibung Motion Control
Hersteller Apex Microtechnology Corporation
Logo Apex Microtechnology Corporation Logo 




Gesamt 6 Seiten
BC05 Datasheet, Funktion
MICROTECHNOLOGY
HIGH PERFORMANCE BRUSHLESS DC MOTOR DRIVER
BC05 • BC05A
HTTP://WWW.APEXMICROTECH.COM (800) 546-APEX (800) 546-2739
FEATURES
• 10V TO 200V MOTOR SUPPLY AT 5A CONTINUOUS
AND 10A PEAK OUTPUT CURRENT
• OPERATION WITH 10.8V TO 16V VCC, ALLOWING
NOMINAL 12V OR 15 V VCC SUPPLIES
• THREE PHASE FULL BRIDGE OPERATION WITH 2 OR
4 QUADRANT PWM
• AUTOMATIC BRAKING WHEN USING 2 QUADRANT PWM
www.DataSheet4UT.cHoEmRMAL PROTECTION
• ANTI SHOOT THROUGH DESIGN
• 50 KHZ INTERNALLY SET PWM FREQUENCY, WHICH MAY
BE LOWERED WITH EXTERNAL CAPACITORS
• SELECTABLE 60° OR 120° COMMUTATION SEQUENCES
• COMMUTATION TRANSITIONS OUTPUT FOR DERIVING
DESCRIPTION
The BC05 Brushless DC Motor Controller provides the
necessary functions to control conventional 3-phase brushless
DC motors in an open loop or closed loop system. The BC05
SPEED CONTROL
• MAY BE USED OPEN LOOP, OR WITHIN A FEEDBACK
LOOP
• ANALOG MOTOR CURRENT MONITOR OUTPUT, MAY BE
USED FOR TORQUE CONTROL OR FOR TRANSCONDUC-
TANCE AMPLIFIER DRIVE.
is able to control motors requiring up to 1kW continuous
input power.
The controller drives the motor, generates the PWM,
decodes the commutation patterns, multiplexes the current
sense, and provides error amplification. Operation with
either 60° or 120° commutation patterns may be selected
with a logic input.
• ANALOG REFERENCE, FEEDBACK, AND TORQUE INPUTS
Current sense multiplexing is used to make the current
monitor output always proportional to the active motor
APPLICATIONS
coils current. Therefore the current monitor output may
be used in generating transconductance drive for easy
• 3 PHASE BRUSHLESS MOTOR CONTROL
servo compensation.
The controller may generate 4-quadrant PWM for applica-
BLOCK DIAGRAM
SSC
18
OE 19
HS1 6
HS2 7
HS3 8
120 22
REV 21
COMMUTATION
DECODE
LOGIC
tions requiring continuous transition through zero velocity, or
2Q
VCC
HV
20 2 9
TOP DRIVE 1
BOTTOM DRIVE 1
V+
1/2
BRIDGE
1
OUT 1
10
S1
2 quadrant PWM for
HV electrically quieter
operation in unidirec-
tional applications.
Direction of rotation
may be reversed in
13 2-quadrant mode by
BRIDGE
CONTROL
LOGIC
using the reverse
command input.
REF IN 23
V+ When in 2-quadrant
+
∑ ∑+
X10
X10
––
PWM
COMPARATOR
PWM
TOP DRIVE 2
BOTTOM DRIVE 2
1/2
BRIDGE
2
OUT 2
11
S2
15
mode if the motor is
stopped or deceler-
ating dynamic brak-
ing is automatically
FB 24
TEMP
SENSING
OVERTEMP
SHUTDOWN
TOP DRIVE 3
BOTTOM DRIVE 3
V+
1/2
BRIDGE
3
OUT 3
12
S3
applied. In this way
deceleration profiles
may be followed even
when using 2-quad-
rant PWM.
14
PWM
OSCILLATOR
POWER
FAULT OVERCURRENT
LOGIC
CURRENT
SENSING
SIGNAL
CONDITIONING
HV RTN
16
HV RTN
4
TORQUE
CT 3
17
FAULT
5
MOTOR I
GROUND 1
APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL [email protected]
1






BC05 Datasheet, Funktion
BC05 • BC05A
OPERATING
CONSIDERATONS
R is the resistor from MOTOR I to TORQUE.
FBI
RIN is the value of the external resistors used to reduce
gain.
Solving this equation for RFBI:
RFBI = 125000(GM)(V)( RS)/ (2.5(A)(V) - GM(RL)) - 10K
If 125000(V)(RS) is large compared to RL(RFBI + 10K), not
always the case, then the equations simplify to:
www.DataSheet4U.com
Gm = A(RFBI + 10K)/(50000RS)
RFBI = 50000(RS)(GM)/A - 10K
However the voltage gain of the PWM amplifier is twice as
high when a 4 quadrant PWM is used. In this case:
Gm = 5(A)(V)(RFBI +10K)/(RL(RFBI +10K) + 250000(V)(RS))
Solving this equation for RFBI:
RFBI = 250000(GM)(V)( RS)/(5(A)(V) - GM(RL)) - 10K
If 250000(V)(RS) is large compared to RL(RFBI +10K), not
always the case, then the equations simplify to the same
as in the 2 quadrant case:
GM = A(RFBI +10K)/(50000RS)
RFBI = (50000(RS)(GM)/A) - 10K
GROUNDING AND BYPASSING
The BC05 output switches hundreds of volts and tens
of amperes with nano-second rise and fall times. Thus
care in bypassing and grounding is required to eliminate
noise in the system..
High voltage return and signal ground are electrically
isolated in the BC05. This allows connections which avoid
ground loops. However in order to avoid damaging offsets
between grounds on internal components internal back to
back schottky diodes are installed between signal ground
and high voltage return. So, at a minimum, signal ground
and high voltage must be tied together at one point in the
system. Clean operation has been obtained with single point
grounding, grounds tied together at the BC05, and with the
combination of single point grounding for dc with grounds
ac connected at the BC05 with a 1 µf capacitor. The system
designer should follow best practice for his system.
On the high voltage supply a switching regulator grade
electrolytic capacitor should be installed between high voltage
and high voltage return. This capacitor should be installed at
the BC05, with leads as short as practical. Apex recommends
10 µf per ampere of output current for this capacitor. The
voltage rating should withstand the highest transient voltage
on the high voltage supply; transients should not be allowed
exceed 450V for safe operation of the BC05. This is
required even if large value filter capacitors are in the
high voltage supply.
A 1 µf minimum ceramic capacitor with the same voltage
rating as the electrolytic should also be installed across
the high voltage supply. This capacitor should be installed
directly from the high voltage pin to the high voltage return
pin. (In our test set ups, this capacitor has a total lead length
of less than 2 inches.)
The control circuit power supply, Vcc is internally bypassed
with a 0.1 µf ceramic. There is no additional bypassing in Apex
test set ups, although it certainly wouldn’t be harmful.
APPLICATION REFERENCES
For additional technical information please refer to the
following Application Notes:
AN 1: General Operating Considerations
AN 30: PWM Basics
100
80
60
40
20
0
25 35 45 55 65 75 85 95 105 115 125
CASE TEMPERATURE, °C
Figure 2: Power Derating, Each Active FET
TAhPisEdXataMsIhCeeRtOhTasEbCeHenNcOarLefOulGlyYchCeOckRedPaOnRd AisTbIeOlieNved t5o9b8e0relNiaOblRe,ThHowSeHveAr,NnoNOreNspoRnOsibAilDityisTaUssCuSmOedNf,orApRoIssZibOleNiAna8cc5ur7ac4ie1s or UomSiAssionAs.PAPllLsIpCecAifiTcIaOtiNonSs aHreOsTuLbIjeNctE:to1ch(a8ng0e0w)it5h4ou6t-n2o7ti3ce9.
6 BC05U REV C MARCH 2003 © 2003 Apex Microtechnology Corp.

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