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DRV10963 Datasheet(PDF) 15 Page - Texas Instruments |
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DRV10963 Datasheet(HTML) 15 Page - Texas Instruments |
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15 / 31 page  DRV10963 www.ti.com SLAS955A – MARCH 2013 – REVISED JULY 2015 7.3.8 Anti-Voltage Surge (AVS) Under normal operation the DRV10963 acts to transfer energy from the power supply to the motor to generate torque, which results in angular rotation of the motor. Under certain conditions, however, energy which is stored in the motor in the form of inductive energy or angular momentum (mechanical energy) can be returned to the power supply. This can happen whenever the output voltage is quickly interrupted or whenever the voltage applied to the motor becomes less than the BEMF voltage generated by the motor. The energy which is returned to the supply can cause the supply voltage to increase. This condition is referred to as voltage surge. The DRV10963 includes an anti-voltage-surge (AVS) feature which prevents energy from being transferred from the motor to the power supply. This feature helps to protect the DRV10963 as well as any other components that are connected to the power supply (VCC). 7.3.8.1 Protecting Against the Return of Mechanical Energy Mechanical energy is typically returned to the power supply when the speed command is abruptly decreased. If the voltage applied to the phase becomes less than the BEMF voltage then the motor will work as a generator and current will flow from the motor back to VCC. This is illustrated in Figure 14. To prevent this from happening, the DRV10963 buffers the speed command value and limits the rate at which it is able to change. The AVS function acts to ensure that the effective output amplitude (U) is maintained to be larger than the BEMF voltage. This prevents current from becoming less than zero. The value of BEMF used to perform this function is calculated by the motor Kt and the motor speed. Figure 14. Mechanical AVS 7.3.8.2 Protecting Against the Return of Inductive Energy When the DRV10963 suddenly stops driving the motor, the current which is flowing in the motor’s inductance will continue to flow. It flows through the intrinsic body diodes in the mosfets and charges VCC. An example of this behavior is illustrated by the two pictures in the top half of Figure 15. When the driver is active, the current flows from S1 to the motor and then to S6 and is returned to ground. When the driver is placed into a high impedance (tri-state) mode, the current goes flows from ground through the body diode of S2 to the motor and then through the body diode of S5 to VCC. The current will continue to flow through the motor’s inductance in this direction until the inductive energy is dissipated. Figure 15. Inductive AVS Copyright © 2013–2015, Texas Instruments Incorporated Submit Documentation Feedback 15 Product Folder Links: DRV10963 |
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