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Using the HCTL-1100 with DC Brush Motors Application Brief M-024

PWM / LINEAR HOST / MICROPROCESSOR CONTROLLER HCTL-1100 ENCODER AMP

Using the HCTL-1100 with DC Brush Motors Application Brief M-024
Introduction
The HCTL-1100 general purpose motion control IC can be used for closed loop position and velocity control of DC Brush motors. A block diagram is shown in Figure 1. A linear or PWM amplifier, host computer / microcontroller and an incremental optical encoder are the only other components needed to design and implement the closed loop control system. Any one of four operating modes (two for position control and two for velocity control) can be used with DC Brush motors. Please refer to the technical data sheets for the HCTL-1100 for detailed information on the different modes of operation. For more information on interfacing to a host please refer to Application Briefs M-015, M-016, M-021, and M-003. For more information on HP optical encoders please refer to Application Briefs M-101 and M-109. Amplifiers compatible with the HCTL-1100s can be built from discrete components, are available as integrated half and full bridges and, from various ven5965-3476E
PWM / LINEAR HOST / MICROPROCESSOR CONTROLLER HCTL-1100 ENCODER AMP
MOTOR
Figure 1. Closed Loop Position and Velocity Control of DC Brush Motor.
dors with special features. A list of some of the manufacturers of amplifiers follows:
Name Allegro SGS-Thomson Unitrode Harris TI Motorola International Rectifier Siliconix Phone Number (508) 853-5000 (602) 867-6100 (603) 424-2410 (407) 724-3000 (800) 336-5236 (708) 490-9500 (310) 322-3331 (408) 970-5700
PWM Interface
Figure 2 shows the glue logic for a PWM amplifier interface to the HCTL-1100 for a DC Brush motor using the L6203 IC made by SGS-Thomson.
Linear Amplifier Interface
Figure 3 shows an example of a linear amplifier interface to the HCTL-1100 for a DC Brush motor using the L165 made by SGS-Thomson. The circuit makes use of a digital to analog converter DAC-08.
In many cases motor manufacturers supply amplifiers for their motors. A good reference for a list of amplifier vendors is the PCIM® (Power Conversion and Intelligent Motion) magazine issue dated December 1995.
PWM #16 SIGN #17
L6203
1 FROM HCTL-1100 2
U1A 74LS00 3 U1D 74L500 11 GND 6 SENSE 10
12 U1B 74LS00 6 10 9 U1C 74LS00 6 13
D2 DIODE BYW 98
OPTICAL INCREMENTAL ENCODER SIGNALS
Figure 2.
CH A 31 CH B 30 +15V FROM HCTL-1100 MC7 25 MC6 24 MC5 23 MC4 22 MC3 21 MC2 20 MC1 19 MC0 18 12 11 10 9 8 7 6 5 14 15 2 1 R1 2 5.0 K 1 B8 B7 B6 B5 B4 B3 B2 B1 +VR -VR VLC -V 1 1 C1 2 0.01 µF R5 10 K 1 R4 10 K COMP 16 -15V 2 2 I OUT 2 2 +15V C3 1 C5 0.1 µF 13 +V U2 I OUT 4 1 2 + U3 L165 - 3 5 4 1 2 0.1 µF OPTICAL INCREMENTAL ENCODER SIGNALS
DIODE
DAC08
D2 DIODE C2 1 2 0.1 µF
2A DC MOTOR
R2 C4 0.1 µF 3 5.0 K -15V
D1, D2:
+15V 2 VIN VO REF-01 5 6 +10V
Figure 3.