COVER STORY
Figure 4: A simplified scheme of power path
for the TMC5160, while the required delay is in the order of tens of nanoseconds. This could be improved by defi ning a diff erent timer-based delay function that allows for shorter delay intervals.
The second cause of this delay is the Scapy function used to receive frames, which requires a minimum set-up time of 3ms after it has been called. In a real- world application, this can be improved by developing the interface directly with network adapter drivers for the operating system, instead of third-party tools like Scapy. However, drawbacks include losing compatibility with diff erent operating systems and increasing code complexity. Precise execution times for the callback implemented on the microcontroller were measured by toggling a GPIO and measuring the high period with an oscilloscope. Measured execution time includes functions used to read and parse received frames and to send commands to motion controllers.
The second set of measurements was made to evaluate power losses along the transmission path when using PoDL to supply remote devices. Tests were conducted by substituting the motion controller shield with an electronic load set at diff erent currents, starting from 0.1A up to 0.5A in 100mA steps, to determine which components had a major impact on power losses and, consequently, how to improve the design to achieve higher current ratings.
Figure 5: Power losses for each passive component, as a function of current
The results show that a major contribution to the losses is given by the bridge rectifi er along with the Schottky diode D2, both used for reverse-polarity protection. Both components could be replaced with a similar circuit based on MOSFETs and an ideal diode controller to gain higher effi ciency, without losing this type of protection. At higher currents, the contribution of the DC resistance of the coupled inductors used for input and output supply fi ltering becomes
dominant, so, to improve current capability, similar inductors with higher current ratings are also needed.
Conclusion
Industry 4.0 is pushing the boundaries of intelligent automation. ADI Trinamic technology used along with the ADIN1100, ADIN1110 and 10BASE-T1L transceivers enable the remote control of sensors and actuators up to 1700m from their controller, without requiring power at the edge. With a reliable method of remote control, stepper motors can easily be controlled in real time at longer distances without sacrifi cing any performance or speed. Systems solutions are paving the way toward an industrial transformation that promises unprecedented response times along with maximum performance.
CONTACT: Table 2: System efficiency
automationmagazine.co.uk
Analog Devices Inc.
www.analog.com
Automation | November 2023 15
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46
