ST STEVAL-WBC86TX - Overvoltage Protection (OVP); Figure 17. OCP Settings; Figure 18. OVP Settings

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Figure 17. OCP settings

4.8.2 Overvoltage protection (OVP)

Excessive input voltage may damage the board and/or device. For this reason, a TVS diode is placed at the input

of the board. The IC is also equipped with an ADC dedicated to monitoring the input voltage level. The protection

can be enabled/disabled in the GUI and the threshold can be set in a range of 0 to 25.5 V. Triggering OVP also

leads to power transfer termination, as an increase in transmitter input voltage may also lead to an increased Rx

VRECT voltage.

Figure 18. OVP settings

UM3161

Protections overview

UM3161 - Rev 1

page 18/78

Main Page

Figure 1. STEVAL-WBC86TX Board1
Reference Design Specifications3
Table 1. STEVAL-WBC86TX Target Specifications3
Overview of the Board4
Figure 2. STEVAL-WBC86TX Evaluation Board Features4
Test Points5
Figure 3. Connectors and Test Points5
Basic Operating Modes6
Table 2. Connectors and Test Points6
Graphical User Interface (GUI)7
Connecting STWBC86 to PC GUI7
Figure 4. GUI Connection7
Patch and Configuration Files8
Figure 5. GUI Device Connection8
Configuration File Generation9
Figure 6. Generation of Configuration File9
Figure 7. Version of the Configuration File9
Header File10
Figure 8. Saving of the Configuration File10
Header File Generation11
Figure 9. Header Generator - Chip Selection11
Figure 10. Header Generation - Pop up Window11
Figure 11. Header Generation - Save Header File12
Programming the Device13
Figure 12. Programming the Device by Header File13
Figure 13. Generating the Header File by Patch and Configuration Files14
Device Description and Operation15
System Block Diagram15
Integrated Power Inverter15
Figure 14. System Block Diagram15
Adc16
Figure 15. H-Bridge Mode Settings16
Figure 16. GUI Charts Monitoring16
Ldos17
Power-Up Sequence17
Uvlo17
Chip Reset17
Protections Overview17
Overcurrent Protection (OCP)17
Overvoltage Protection (OVP)18
Figure 17. OCP Settings18
Figure 18. OVP Settings18
Overtemperature Protection (OVTP)19
Ntc19
Figure 19. OVTP Settings19
Figure 20. NTC Connection on Board20
Figure 21. NTC Settings20
Foreign Object Detection (FOD)21
FOD Tuning21
Figure 22. Disable FO Detection21
Figure 23. Add a New Dataset22
Figure 24. Display Dataset in Plot22
Figure 25. Enable Auto Scroll22
Figure 26. Additional Dataset Options23
Figure 27. Line Properties - Dashed/Solid23
Figure 28. Line Properties - Color23
Figure 29. Logged Data24
Figure 30. Delete a Single Data Point25
Figure 31. Spot Wrong Data Point in Plot25
Figure 32. Plot Logged Data26
Figure 33. Ploss Threshold27
Figure 34. CTC Threshold27
Figure 35. Unsutiable Parameter Values Highlighted in Red28
Figure 36. Load Tuned Parameters29
Figure 37. Enable FOD and Set FOD Debounce29
EPT Reason30
Figure 38. EPT Reason30
Figure 39. Received Message31
Figure 40. EPT Interrupt Setting31
WPC Qi Wireless Power Transfer32
Figure 41. Protection Debounce Setting32
Figure 42. EPT Reping Settings32
Wireless Power Interface33
Bidirectional Communication33
Figure 43. Power Transfer Start up Sequence33
ASK Communication35
Figure 44. Amplitude Modulation of the Power Signal35
Figure 45. Example of a Differential Bi-Phase Encoding Scheme36
Figure 46. Example of the Asynchronous Serial Format36
Figure 47. ASK Communication Example - High Load Current36
FSK Communication37
Figure 48. ASK Communication - no Load37
Figure 49. Example of Differential Bi-Phase Encoding37
Most Common Qi Communication Packets38
Figure 50. Format of the Three Defined Responses38
I2C Interface39
Data Validity39
Start and Stop Conditions39
Byte Format39
Interface Protocol39
Writing to a Single Register39
Writing to Multiple Registers with Incremental Addressing40
Reading from a Single Register40
Figure 51. Writing to a Single Register40
Figure 52. Writing to Multiple Registers40
Figure 53. Reading from a Single Register40
Reading from Multiple Registers with Incremental Addressing41
Gpiox and INTB Pins41
Interrupt Registers41
Table 3. GPIO Functions41
Figure 54. Reading from Multiple Registers41
Frequency Hopping (Fhop)42
Figure 55. Interrupt Registers42
Figure 56. FHOP Settings43
Figure 57. FHOP Example43
PID Tuning44
Figure 58. PID Parameters44
STEVAL-WBC86TX Description and Operation45
STWBC86 Default Configuration45
Table 4. Basic Parameters45
Typical Performance Characteristics46
Power-Up Waveforms46
Table 5. Charging Performance46
Table 6. Signal Legend for Power up Waveform46
Figure 59. Power up Waveform46
Efficiency and Spatial Freedom in the XY Plane47
Figure 60. X, y Axis for Misalignment47
Efficiency and Spatial Freedom in the Z-Axis48
Figure 61. Efficiency Curve in X Axis48
Figure 62. Efficiency Curve in y Axis48
Thermal Performance49
Figure 63. Efficiency Curve in Z Axis49
Figure 64. Thermal Performance49
Designing a 5 W Wireless Power Transmitter Based on the STEVAL-WBC86TX50
Evaluation Board50
External Component Design50
Coil Selection50
Series Resonant Capacitor Selection50
Vin and Vinv Capacitors Selection50
Hardware Input Protections50
Ring Node Voltage Sensing51
PCB Layout Guidelines51
Figure 65. Ring Node Voltage Sensing51
Figure 66. Ring Node Divider Configuration51
Reference Code with STM32 Development Boards52
Hardware Requirements52
Hardware Connections52
Table 7. Pin Connection between Host (STM32) and STWBC8652
Figure 67. Pin Connection between Host and STWBC86 Chip/Evaluation Board52
Software Requirements53
Source Files53
Reference Code Porting Procedure53
Figure 68. Connectivity53
Api54
Error Codes54
Table 8. Error Codes with Descriptions54
Schematic Diagrams55
Figure 69. STEVAL-WBC86TX Circuit Schematic (1 of 4)55
Figure 70. STEVAL-WBC86TX Circuit Schematic (2 of 4)56
Figure 71. STEVAL-WBC86TX Circuit Schematic (3 of 4)57
Figure 72. STEVAL-WBC86TX Circuit Schematic (4 of 4)58
Bill of Materials59
Table 9. STEVAL-WBC86TX Bill of Materials59
STEVAL-WBC86TX PCB Layout62
Figure 73. Top Layer62
Figure 74. Inner1 Layer63
Figure 75. Inner2 Layer64
Figure 76. Bottom Layer65
Board Versions66
Table 10. STEVAL-WBC86TX Versions66
Regulatory Compliance Information67
Appendix A Thermal Measurements68
Figure 77. Temperature before Power Transfer Maximum 25⁰C on STEVAL-WBC86TX68
Figure 78. Maximum Temperature of the Board after 2Hours (40.8⁰C) - 5W Power Transfer STEVAL-WLC38RX69
Figure 79. Maximum Temperature of the Board and Plastic Case after 2Hours (33.5⁰C) - 5W Power Transfer70
Revision History71
Table 11. Document Revision History71
Table of Contents72
List of Tables75
List of Figures76

ST STEVAL-WBC86TX - Overvoltage Protection (OVP); Figure 17. OCP Settings; Figure 18. OVP Settings

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