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UCC2626 Datasheet(PDF) 8 Page - Texas Instruments |
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UCC2626 Datasheet(HTML) 8 Page - Texas Instruments |
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8 / 15 page  8 UCC2626 UCC3626 Two Quadrant vs Four Quadrant Control Fig. 8 illustrates the four possible quadrants of operation for a motor. Two quadrant control refers to a system whose operation is limited to quadrants I and III where torque and velocity are in the same direction. With a two quadrant brushless DC amplifier, there are no provisions other than friction to decelerate the load, limiting the ap- proach to less demanding applications. Four quadrant controllers, on the other hand, provide controlled opera- tion in all quadrants, including II and IV, where torque and rotation are of opposite direction. When configured for two quadrant operation, (QUAD=0), the UCC3626 will only modulate the low side devices of the output power stage. The current paths within the out- put stage during the PWM on and off times are illus- trated in Fig. 9. During the 'on' interval, both switches are on and current flows through the load down to ground. During the 'off' time, the lower switch is shut off and the motor current circulates through the upper half bridge via the flyback diode. The motor is assumed to be operating in either quadrant I or III. APPLICATION INFORMATION (cont.) 2 5 4 14 VREF R_TACH C_TACH PWM_NI PWM_I 13 TACH_OUT 3 6CT + – UCC3626 Figure 7. Simple analog velocity loop. UDG-97189 I II III IV VELOCITY CW TORQUE CW CCW CCW Figure 8. Four quadrants of operation. IPHASE + BEMF - VMOT IOFF ION S1 S3 S5 S2 S4 S6 Figure 10. Two quadrant reversal. IPHASE + BEMF - VMOT IOFF ION S1 S3 S5 S2 S4 S6 Figure 9. Two quadrant chopping. |
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Similar Description - UCC2626 |
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