Data Determination Method for Supplying-End Module of Induction Type Power Supply System and Related Supplying-End Module

• US 20150065045A1
• Filed: 11/07/2014
• Published: 03/05/2015
• Est. Priority Date: 02/01/2011
• Status: Active Grant

• Current Assignee: Fu Da Tong Technology Co., Ltd.
• Original Assignee: Fu Da Tong Technology Co., Ltd.
• Inventors: Tsai, Ming-Chiu, Chan, Chi-Che
• Granted Patent: US 10,056,944 B2
• Time in Patent Office: Days
• US Class Current: 455/41.1
• CPC Class Codes: G06F 1/26 Power supply means, e.g. regulation thereof for memories G11C
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 50/80 involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
• CPC Class Codes: H04B 5/24 Inductive coupling
• CPC Class Codes: H04B 5/72 for local intradevice communication
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer

Abstract

A data determination method for a supplying-end module of an induction type power supply system includes generating a current signal on a resonant coil of the supplying-end module according to a modulated signal of a receiving-end module of the induction type power supply system fed back from a resonant coil of the receiving-end module to the resonant coil of the supplying-end module; amplifying the current signal to retrieve a plurality of peak values of the current signal; setting a reference voltage according to magnitudes of the plurality of peak values; comparing the plurality of peak values with the reference voltage to generate a comparison result; and analyzing the comparison result to obtain modulation data of the receiving-end module of the induction type power supply system.

Claims

1. A data determination method for a supplying-end module of an induction type power supply system, the method comprising:

generating a current signal on a resonant coil of the supplying-end module according to a modulated signal of a receiving-end module of the induction type power supply system fed back from a resonant coil of the receiving-end module to the resonant coil of the supplying-end module;

amplifying the current signal to retrieve a plurality of peak values of the current signal;

setting a reference voltage according to magnitudes of the plurality of peak values;

comparing the plurality of peak values with the reference voltage to generate a comparison result; and

analyzing the comparison result to obtain modulation data of the receiving-end module of the induction type power supply system.

2. The data determination method of claim 1, wherein the current signal corresponds to a current flowing through the resonant coil of the supplying-end module.

3. The data determination method of claim 1, further comprising:

not performing filtering on the current signal.

4. The data determination method of claim 1, wherein the plurality of peak values of the current signal are located in positive half cycles of the current signal.

5. The data determination method of claim 1, wherein the step of setting the reference voltage according to the magnitudes of the plurality of peak values comprises:

setting the reference voltage to a predefined value;

calculating a frequency of the current signal to determine a total number of the plurality of peak values during a first period;

detecting a number of peak values greater than the reference voltage among the plurality of peak values during the first period, in order to calculate a first trigger ratio of the plurality of peak values greater than the reference voltage according to the total number of the plurality of peak values; and

adjusting the reference voltage according to the first trigger ratio.

6. The data determination method of claim 5, wherein the modulation data of the receiving-end module of the induction type power supply system is transmitted via a data format of a universal asynchronous receiver transmitter (UART), and a length of the first period is not smaller than three sub-data cycles, wherein each of the sub-data cycles is a cycle of signal transition in a non-return-to-zero (NRZ) line code.

7. The data determination method of claim 5, wherein the step of adjusting the reference voltage according to the first trigger ratio comprises:

increasing the reference voltage when the first trigger ratio is greater than a first threshold value;

or

decreasing the reference voltage when the first trigger ratio is smaller than a second threshold value.

8. The data determination method of claim 1, wherein the step of comparing the plurality of peak values with the reference voltage to generate the comparison result comprises:

calculating a frequency of the current signal to determine a total number of the plurality of peak values during a second period;

detecting a number of peak values greater than the reference voltage among the plurality of peak values during the second period, in order to calculate a second trigger ratio of the plurality of peak values greater than the reference voltage according to the total number of the plurality of peak values; and

outputting a sub-data bit corresponding to the second period according to the second trigger ratio.

9. The data determination method of claim 8, wherein the modulation data of the receiving-end module of the induction type power supply system is transmitted via a data format of a UART, and a length of the second period is equal or close to a sub-data cycle, wherein the sub-data cycle is a cycle of signal transition in a NRZ line code.

10. The data determination method of claim 8, wherein the step of outputting the sub-data bit corresponding to the second period according to the second trigger ratio comprises:

outputting the sub-data bit as logic “

1”

when the second trigger ratio is greater than a third threshold value;

or

outputting the sub-data bit as logic “

0”

when the second trigger ratio is smaller than a fourth threshold value;

wherein the third threshold value is greater than or equal to the fourth threshold value.

11. The data determination method of claim 10, wherein the step of outputting the sub-data bit corresponding to the second period according to the second trigger ratio further comprises:

setting the sub-data bit to be pending when the second trigger ratio is located between the third threshold value and the fourth threshold value.

12. The data determination method of claim 11, further comprising:

setting at least one sub-data bit among three sub-data bits corresponding to three consecutive second periods to be pending when the three sub-data bits have the same value.

13. The data determination method of claim 12, further comprising:

in turn, determining a logic value of each of a plurality of sub-data bits in the modulation data, in order to generate a received data sequence comprising the plurality of sub-data bits.

14. The data determination method of claim 13, wherein the step of analyzing the comparison result to obtain the modulation data of the receiving-end module of the induction type power supply system comprises:

when there is at least one pending sub-data bit among the plurality of sub-data bits, respectively inputting different logic values to the at least one pending sub-data bit, in order to generate a plurality of pending received data sequences after all of the plurality of sub-data bits in the modulation data are determined;

decoding the plurality of sub-data bits in each of the plurality of pending received data sequences to generate a plurality of modulation data sequences, respectively; and

in turn, determining an accuracy of each of the plurality of modulation data sequences according to an error checking code in the modulation data.

15. The data determination method of claim 14, wherein the step of in turn determining the accuracy of each of the plurality of modulation data sequences according to the error checking code in the modulation data comprises:

when a modulation data sequence among the plurality of modulation data sequences is determined to be accurate, outputting the modulation data sequence as an accurate decoding result of the modulation data;

when a modulation data sequence among the plurality of modulation data sequences is determined to be inaccurate, determining a next modulation data sequence among the plurality of modulation data sequences; and

when all of the plurality of modulation data sequences are determined to be inaccurate, discarding the plurality of modulation data sequences.

16. The data determination method of claim 1, further comprising:

performing an initialization process for obtaining the modulation data according to a characteristic of the plurality of peak values.

17. The data determination method of claim 16, wherein the step of performing the initialization process for obtaining the modulation data according to the characteristic of the plurality of peak values comprises:

determining whether the plurality of peak values comply with a format of a pre-launch signal of a UART.

18. The data determination method of claim 16, wherein the step of performing the initialization process for obtaining the modulation data according to the characteristic of the plurality of peak values further comprises:

detecting whether there is a specific number of consecutive peak values not exceeding the reference voltage;

after the specific number of consecutive peak values not exceeding the reference voltage is detected, determining whether a following peak value exceeds the reference voltage, and starting a first timer when a peak value exceeding the reference voltage occurs;

when the first timer is running, after the specific number of consecutive peak values not exceeding the reference voltage is detected, determining whether a following peak value exceeds the reference voltage, and stopping the first timer when another peak value exceeding the reference voltage occurs;

determining whether a first run time of the first timer is equal or close to a predefined data cycle; and

starting a second timer when the first run time of the first timer is equal or close to the predefined data cycle, or stopping the initialization process when the first run time of the first timer is not equal or close to the predefined data cycle.

19. The data determination method of claim 18, wherein the step of performing the initialization process for obtaining the modulation data according to the characteristic of the plurality of peak values further comprises:

performing the following steps when the second timer is running;

re-starting the first timer;

after the specific number of consecutive peak values not exceeding the reference voltage is detected, determining whether a following peak value exceeds the reference voltage, and stopping the first timer when a further peak value exceeding the reference voltage occurs;

determining whether a second run time of the first timer is equal or close to the predefined data cycle;

repeating the above steps when the run time of the first timer is equal or close to the predefined data cycle, or stopping the initialization process when the run time of the first timer is not equal or close to the predefined data cycle; and

stopping the second timer, and calculating a run time of the second timer when a number of times of re-starting and stopping the first timer reaches a predetermined number;

diving the run time of the second timer by the predetermined number to obtain a length of a real data cycle; and

setting a length of a cycle for determining a data bit to be equal to the length of the real data cycle.

20. The data determination method of claim 19, further comprising:

calculating a real sub-data cycle according to the real data cycle; and

in turn, obtaining a plurality of sub-data bits according to the length of the real sub-data cycle with a starting point on a stopping time of the second timer.

21. A supplying-end module for an induction type power supply system comprising:

a current sensing element, for generating a current signal on a resonant coil of the supplying-end module according to a modulated signal of a receiving-end module of the induction type power supply system fed back from a resonant coil of the receiving-end module to the resonant coil of the supplying-end module;

at least one amplifier, for amplifying the current signal to retrieve a plurality of peak values of the current signal;

a voltage setting unit, for setting a reference voltage according to magnitudes of the plurality of peak values;

a comparator, for comparing the plurality of peak values with the reference voltage to generate a comparison result; and

a control unit, for analyzing the comparison result to obtain modulation data of the receiving-end module of the induction type power supply system.

22. The supplying-end module of claim 21, wherein the current signal corresponds to a current flowing through the resonant coil of the supplying-end module.

23. The supplying-end module of claim 21, wherein the at least one amplifier comprises:

a first amplifier, for retrieving a positive half-cycle part of the current signal and performing a first stage amplification on the positive half-cycle part; and

a second amplifier, electrically connected to the first amplifier, for performing a second stage amplification on the plurality of peak values located in the positive half-cycle part according to a first reference voltage;

wherein the comparator compares the plurality of peak values after being amplified by the second stage amplification with a second reference voltage to generate the comparison result.

24. The supplying-end module of claim 23, wherein the voltage setting unit comprises:

a first voltage generator, electrically connected to the second amplifier, for outputting the first reference voltage; and

a second voltage generator, electrically connected to the comparator, for outputting the second reference voltage.

25. The supplying-end module of claim 21, wherein the voltage setting unit comprises:

a first processor; and

a first storage unit, electrically connected to the first processor, for storing a first program which instructs the first processor to perform the following steps;

setting the reference voltage to a predefined value;

calculating a frequency of the current signal to determine a total number of the plurality of peak values during a first period;

detecting a number of peak values greater than the reference voltage among the plurality of peak values during the first period, in order to calculate a first trigger ratio of the plurality of peak values greater than the reference voltage according to the total number of the plurality of peak values; and

adjusting the reference voltage according to the first trigger ratio.

26. The supplying-end module of claim 25, wherein the modulation data of the receiving-end module of the induction type power supply system is transmitted via a data format of a universal asynchronous receiver transmitter (UART), and a length of the first period is not smaller than three sub-data cycles, wherein each of the sub-data cycles is a cycle of signal transition in a non-return-to-zero (NRZ) line code.

27. The supplying-end module of claim 25, wherein the first program further instructs the first processor to perform the following steps to adjust the reference voltage according to the first trigger ratio:

increasing the reference voltage when the first trigger ratio is greater than a first threshold value;

or

decreasing the reference voltage when the first trigger ratio is smaller than a second threshold value.

28. The supplying-end module of claim 21, wherein the control unit comprises:

a second processor; and

a second storage unit, electrically connected to the second processor, for storing a second program which instructs the second processor to perform the following steps;

calculating a frequency of the current signal to determine a total number of the plurality of peak values during a second period;

detecting a number of peak values greater than the reference voltage among the plurality of peak values during the second period, in order to calculate a second trigger ratio of the plurality of peak values greater than the reference voltage according to the total number of the plurality of peak values; and

outputting a sub-data bit corresponding to the second period according to the second trigger ratio.

29. The supplying-end module of claim 28, wherein the modulation data of the receiving-end module of the induction type power supply system is transmitted via a data format of a UART, and a length of the second period is equal or close to a sub-data cycle, wherein the sub-data cycle is a cycle of signal transition in a NRZ line code.

30. The supplying-end module of claim 28, wherein the second program further instructs the second processor to perform the following steps to output the sub-data bit corresponding to the second period according to the second trigger ratio:

outputting the sub-data bit as logic “

1”

when the second trigger ratio is greater than a third threshold value;

or

outputting the sub-data bit as logic “

0”

when the second trigger ratio is smaller than a fourth threshold value;

wherein the third threshold value is greater than or equal to the fourth threshold value.

31. The supplying-end module of claim 30, wherein the second program further instructs the second processor to perform the following step to output the sub-data bit corresponding to the second period according to the second trigger ratio:

setting the sub-data bit to be pending when the second trigger ratio is located between the third threshold value and the fourth threshold value.

32. The supplying-end module of claim 31, wherein the second program further instructs the second processor to perform the following step:

setting at least one sub-data bit among three sub-data bits corresponding to three consecutive second periods to be pending when the three sub-data bits have the same value.

33. The supplying-end module of claim 32, wherein the second program further instructs the second processor to perform the following step:

in turn, determining a logic value of each of a plurality of sub-data bits in the modulation data, in order to generate a received data sequence comprising the plurality of sub-data bits.

34. The supplying-end module of claim 33, wherein the second program further instructs the second processor to perform the following steps to analyze the comparison result to obtain the modulation data of the receiving-end module of the induction type power supply system:

when there is at least one pending sub-data bit among the plurality of sub-data bits, respectively inputting different logic values to the at least one pending sub-data bit, in order to generate a plurality of pending received data sequences after all of the plurality of sub-data bits in the modulation data are determined;

decoding the plurality of sub-data bits in each of the plurality of pending received data sequences to generate a plurality of modulation data sequences, respectively; and

in turn, determining an accuracy of each of the plurality of modulation data sequences according to an error checking code in the modulation data.

35. The supplying-end module of claim 34, wherein the second program further instructs the second processor to perform the following steps to in turn determine the accuracy of each of the plurality of modulation data sequences according to the error checking code in the modulation data:

when a modulation data sequence among the plurality of modulation data sequences is determined to be accurate, outputting the modulation data sequence as an accurate decoding result of the modulation data;

when a modulation data sequence among the plurality of modulation data sequences is determined to be inaccurate, determining a next modulation data sequence among the plurality of modulation data sequences; and

when all of the plurality of modulation data sequences are determined to be inaccurate, discarding the plurality of modulation data sequences.

36. The supplying-end module of claim 21, wherein the control unit is further utilized for performing an initialization process for obtaining the modulation data according to a characteristic of the plurality of peak values.

37. The supplying-end module of claim 36, wherein the control unit further performs the following step to perform the initialization process for obtaining the modulation data according to the characteristic of the plurality of peak values:

determining whether the plurality of peak values comply with a format of a pre-launch signal of a UART.

38. The supplying-end module of claim 36, wherein the control unit further performs the following steps to perform the initialization process for obtaining the modulation data according to the characteristic of the plurality of peak values:

detecting whether there is a specific number of consecutive peak values not exceeding the reference voltage;

after the specific number of consecutive peak values not exceeding the reference voltage is detected, determining whether a following peak value exceeds the reference voltage, and starting a first timer when a peak value exceeding the reference voltage occurs;

when the first timer is running, after the specific number of consecutive peak values not exceeding the reference voltage is detected, determining whether a following peak value exceeds the reference voltage, and stopping the first timer when another peak value exceeding the reference voltage occurs;

determining whether a first run time of the first timer is equal or close to a predefined data cycle; and

starting a second timer when the first run time of the first timer is equal or close to the predefined data cycle, or stopping the initialization process when the first run time of the first timer is not equal or close to the predefined data cycle.

39. The supplying-end module of claim 38, wherein the control unit further performs the following steps to perform the initialization process for obtaining the modulation data according to the characteristic of the plurality of peak values:

performing the following steps when the second timer is running;

re-starting the first timer;

after the specific number of consecutive peak values not exceeding the reference voltage is detected, determining whether a following peak value exceeds the reference voltage, and stopping the first timer when a further peak value exceeding the reference voltage occurs;

determining whether a second run time of the first timer is equal or close to the predefined data cycle;

repeating the above steps when the second run time of the first timer is equal or close to the predefined data cycle, or stopping the initialization process when the second run time of the first timer is not equal or close to the predefined data cycle; and

stopping the second timer, and calculating a run time of the second timer when a number of times of re-starting and stopping the first timer reaches a predetermined number;

diving the run time of the second timer by the predetermined number to obtain a length of a real data cycle; and

setting a length of a cycle for determining a data bit to be equal to the length of the real data cycle.

40. The supplying-end module of claim 39, wherein the control unit is further utilized for performing the following steps:

calculating a real sub-data cycle according to the real data cycle; and

in turn, obtaining a plurality of sub-data bits according to the length of the real sub-data cycle with a starting point on a stopping time of the second timer.