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UC3626 Folha de dados(PDF) 11 Page - Texas Instruments |
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UC3626 Folha de dados(HTML) 11 Page - Texas Instruments |
11 / 23 page UCC2626, UCC3626 SLUS318B – APRIL 1999 – REVISED JANUARY 2002 11 www.ti.com APPLICATION INFORMATION The TACH_OUT signal can be used to close a digital velocity loop using a microcontroller, as shown in Figure 6, or directly low-pass filtered in an analog implementation, Figure 7. UDG–97188 5 4 14 R_TACH C_TACH PWM_NI PWM_I 13 TACH_OUT 3 6CT UCC3626 VOUT AD558 VCE VCS IC1 PC0 MC68HC11 PB0–PB7 DB0–DB7 VOUTSENSE VOUTSELECT Figure 6. Digital Velocity Loop Implementation Using MC68HC11 two quadrant vs four quadrant control Figure 8 illustrates the four possible quadrants of operation for a motor. Two-quadrant control refers to a system in which 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 approach to less demanding applications. Four-quadrant controllers, on the other hand, provide controlled operation in all quadrants, including II and IV, where torque and rotation are of opposite direction. 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 IV III II VELOCITY CW CCW TORQUE CW CCW UDG–01118 Figure 8. Four Quadrants of Operation |
Nº de peça semelhante - UC3626 |
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Descrição semelhante - UC3626 |
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