POWER TRANSMISSION METHOD OF HIGH-POWER WIRELESS INDUCTION POWER SUPPLY SYSTEM

• US 20110291489A1
• Filed: 10/06/2010
• Published: 12/01/2011
• Est. Priority Date: 05/31/2010
• Status: Active Grant

• Current Assignee: Fu Da Tong Technology Co., Ltd.
• Original Assignee: Fu Da Tong Technology Co., Ltd.
• Inventors: CHAN, Chi-Che, TSAI, Ming-Chiu
• GRANTED PATENT: US 8,417,359 B2
• Time in patent office: 0 Days
• US Class Current: 307/104
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/80 involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices

Abstract

A power transmission method used in a high-power wireless induction power supply system consisting of a power-supplying module and a power-receiving module is disclosed. The power-supplying module regulates its output energy by means of frequency modulation and driving power adjustment, enabling the energy to be received by the power-receiving module and transmitted through a power-receiving coil array and a primary resonant capacitor and a secondary resonant capacitor of power-receiving resonance circuit, a synchronizing rectifier, a low-power voltage stabilizer, a high-frequency filter capacitor, a first power switch, a low-frequency filter capacitor and a second power switch of a filter circuit for output to an external apparatus.

Claims

1. A power transmission method used in a high-power wireless induction power supply system comprising a power-supplying module and a power-receiving module, said power-supplying module comprising a power-supplying microprocessor having installed therein a software and a memory, a power circuit electrically connected to said power-supplying microprocessor and electrically connectable to an external power source, a first driver circuit and a second driver circuit each consisting of a plurality of parallelly connected MOSFET arrays and electrically connected in parallel to said power-supplying microprocessor, a power-supplying resonance circuit electrically connected to said first driver circuit and consisting of a capacitor array and a power-supplying coil array that is adapted for receiving power supply from said second driver circuit and emitting a power energy, a signal sampling circuit electrically connected to said power-supplying coil array, a data analysis circuit electrically connected between said power-supplying microprocessor and said signal sampling circuit, and a voltage sensor circuit having one end thereof electrically connected with said data analysis circuit to said power-supplying microprocessor and an opposite end thereof electrically connected to said signal sampling circuit in a parallel manner relative to said data analysis circuit, the power transmission method comprising the steps of:

(a1) system starts up system initialization, and said power-supplying microprocessor runs built-in program and reads in system parameters from said memory immediately after initialization of the system;

(a2) system scans coil resonant points where said power-supplying microprocessor automatically scans the frequency of the resonant maximum point of the capacitor array and power-supplying coil array of said power supply resonance circuit, the frequency of resonant minimum point defined by the system, the system operation normal resonance frequency, the system operation maximum resonance frequency and the frequency of resonant maximum point outputted by said power-supplying microprocessor;

(a3) said power-supplying microprocessor stores the respective frequency values in said memory;

(a4) system enters the standby mode in which said power-supplying microprocessor outputs any PWM signal to said first driver circuit and said second driver circuit, said power-supplying resonance circuit emits no electromagnetic energy, and the system starts to count a predetermined clock cycle;

(a5) the time of the clock cycle is up, and said power-supplying microprocessor outputs a transient PWM signal to said first driver circuit and said second driver circuit, causing said power-supplying resonance circuit to emit an electromagnetic energy for delivering power supply;

(a6) system scans data signal status where said signal sampling circuit detects said power-supplying coil array to check the receipt of a feedback data signal from said power-receiving module, and then the system proceeds to step (a7) when said signal sampling circuit receives a feedback data signal from said power-receiving module, or returns to step (a4) when said signal sampling circuit receives no signal;

(a7) system enters the power-supplying mode and then said power-supplying microprocessor outputs a continuous PWM signal to said first driver circuit/said second driver circuit, causing said power-supplying resonance circuit to emit an electromagnetic energy and to transmit power supply to said power-receiving module; and

(a8) system interrupts the power-supplying mode and enters the standby mode, and then repeats step (a4).

2. The power transmission method as claimed in claim 1, wherein said step (a2) of scanning coil resonant points comprises the sub-steps of:

(b1) said power-supplying microprocessor reads in the maximum resonance frequency from the system parameters stored in said memory;

(b2) said power-supplying microprocessor outputs a PWM signal to said first driver circuit/said second driver circuit to drive said power-supplying resonance circuit;

(b3) said power-supplying microprocessor scans the coil signal amplitude of said capacitor array and said power-supplying coil array of said power-supplying resonance circuit by means of automatic frequency variation;

(b4) said power-supplying microprocessor compares the scanned coil signal amplitude with the system parameter, and then proceeds to step (b5) if the scanned coil signal amplitude is above the system parameter, or step (b6) if the scanned oil signal amplitude is below the range of the system parameter, or step (b7) if the scanned coil signal amplitude is within the range of the system parameter;

(b5) said power-supplying microprocessor raises the resonance frequency to move the coil signal amplitude toward said system operation maximum resonance frequency, and then repeats step (b2);

(b6) said power-supplying microprocessor lowers the resonance frequency to move the coil signal amplitude toward said frequency of resonant minimum point defined by the system, and then repeats step (b2); and

(b7) said power-supplying microprocessor stores the value of the resonance value in said memory for use as the system operation normal resonance frequency.

3. The power transmission method as claimed in claim 1, wherein said step (a5) in which said power-supplying microprocessor outputs a transient PWM signal to said first driver circuit and said second driver circuits comprises the sub-steps of:

(c1) said power-supplying microprocessor reads in the value of the resonance frequency stored in said memory;

(c2) said power-supplying microprocessor outputs a PWM signal to said first driver circuit/said second driver circuit, driving said power-supplying resonance circuit to emit said frequency of resonant maximum point set by the system;

(c3) said power-supplying microprocessor corrects the resonance frequency downwardly to the value of the resonance frequency stored in its built-in memory; and

(c4) said power-supplying module outputs the resonance frequency to start sending power supply to said power-receiving module or scanning feedback signal from said power-receiving module.

4. The power transmission method as claimed in claim 1, wherein said power-supplying module further comprises a temperature sensor module electrically connected to said power-supplying microprocessor and adapted for sensing the temperature of said first driver circuit, said second driver circuit and said power-supplying coil array;

when said power-supplying module received a data signal from said power-receiving module, the system enters the power-supplying mode and proceeds to said (a7) that comprises the sub-steps of;

(d01) said power-supplying module analyzes the ID code of the data signal received by said power-supplying coil array from said power-receiving module, via said signal sampling circuit;

(d02) said power-supplying module checks the correctness of the ID code, and then proceeds to step (d03) when the ID code is incorrect, or step (d04) when the ID code is correct;

(d03) said power-supplying module determines the result of no mating power-receiving module, and then proceeds to step (d15);

(d04) said power-supplying module reads in the power output data of the system parameters from said memory and corrects the output power subject to the power demand of said power-receiving module, and then proceeds to step (d05) if the power demand is to lower the output power, or step (d06) if the power demand is to raise the output power;

(d05) said power-supplying module raises the outputting PWM signal frequency, causing said first driver circuit/said second driver circuit to lower the output power of said power-supplying resonance circuit, and then proceeds to step (d07);

(d06) said power-supplying module lowers the outputting PWM signal frequency, causing said first driver circuit/said second driver circuit to raise the output power of said power-supplying resonance circuit, and then proceeds to step (d07);

(d07) said power-supplying module checks the system power output status;

(d08) said power-supplying module checks the power output value of said power-supplying resonance circuit via said voltage sensor circuit, and then proceeds to step (d09) if the power output value surpasses the limited output range of said first driver circuit/said second driver circuit, or step (d10) if the power output value is below the limited output range of said first driver circuit/said second driver circuit, or step (d11) if the power output value is within the limited output range of said first driver circuit/said second driver circuit;

(d09) said power-supplying module increases the number of the operating MOSFET arrays of said first driver circuit/said second driver circuit, and then proceeds to step (d12);

(d10) said power-supplying module reduces the number of the operating MOSFET arrays of said first driver circuit/said second driver circuit, and then proceeds to step (d12);

(d11) said power-supplying module makes no change to the number of the operating MOSFET arrays of said first driver circuit/said second driver circuit, and then proceeds to step (d12);

(d12) said power-supplying module checks the operating temperature of said first driver circuit, said second driver circuit and said power-supplying coil array by means of said temperature sensor module;

(d13) said power-supplying module determines whether or not the detected operating temperature is within a predetermined limit range, and then proceeds to step (d14) when positive, or step (d15) when negative;

(d14) the operating temperature is normal, and the system returns to step (d01); and

(d15) the system interrupts the power-supplying mode, and then enters the standby mode.

5. The power transmission method as claimed in claim 1, wherein said power-receiving module comprises a power-receiving microprocessor, a power-receiving resonance circuit electrically connected to said power-receiving microprocessor and comprising a power-receiving coil array adapted for receiving the power energy emitted by said power-supplying coil array of said power-supplying module and a primary resonant capacitor and a secondary resonant capacitor electrically connected in parallel to said power-receiving coil array, a synchronizing rectifier electrically connected to said primary resonant capacitor, a low-power voltage stabilizer electrically connected to said secondary resonant capacitor and adapted for providing a low voltage to said power-supplying module and said synchronizing rectifier, a filter circuit electrically connected to said synchronizing rectifier and comprising a high-frequency filter capacitor, a first power switch, a low-frequency filter capacitor and a second power switch, a power output terminal electrically connected to the second power switch for DC power output, a voltage sensor circuit having two input ends respectively electrically connected to said high-frequency filter capacitor and said low-frequency filter capacitor and an output end electrically connected to said power-receiving microprocessor and adapted for sensing the voltage of said high-frequency filter capacitor and the voltage of said low-frequency filter capacitor and providing the sensed voltage signal to said power-receiving microprocessor for enabling said power-receiving microprocessor to switch said first power switch or said second power switch for output of DC power supply from said high-frequency filter capacitor or said low-frequency filter capacitor to said power output terminal of said power-supplying module, and a signal modulation circuit electrically connected to said power-receiving microprocessor and adapted for modulating encoded signal from said power-receiving microprocessor for enabling said power-receiving coil array to transmit a data signal to said power-supplying module wirelessly for judgment of power output level;

said step (a7) in which the system enters the power-supplying mode and then said power-supplying microprocessor outputs a continuous PWM signal to said first driver circuit/said second driver circuit comprises the sub-steps of;

(d01) said power-receiving resonance circuit of said power-receiving module receives no energy;

said power-receiving module is in the standby status;

(d02) said power-receiving resonance circuit of the power-receiving module receives an electromagnetic wave energy of a transient PWM signal from said power-supplying module;

said power-receiving module enters the startup procedure;

(d03) said power-receiving microprocessor turns off said synchronizing rectifier and said first power switch and said second power switch of said filter circuit;

(d04) said power-supplying module scans the receiving of an ID code of a feedback signal from the power-receiving module;

the system proceeds to step (d05) when no ID code is received by said power-supplying module, or step (d06) when the correct ID code is received;

(d05) said power-supplying module receives no ID code and regards said power-receiving module to be beyond the receiving range;

the system repeats step (d01);

(d06) said power-supplying module receives the ID code and keeps sending power supply to said power-receiving module;

(d07) said power-receiving microprocessor turns on said synchronizing rectifier;

(d08) said power-receiving microprocessor drives said voltage sensor circuit to detect the voltage of said high-frequency filter capacitor of said filter circuit, and then proceeds to step (d09) when the detected voltage is below the predetermined limit, or step (d10) when the detected voltage is above the predetermined limit;

(d09) said power-receiving microprocessor outputs an encode signal for power-up to said signal modulation circuit, driving said power-receiving coil array to emit a data signal to said power-supplying module for correcting power output, and then proceeds to step (d11);

(d10) said power-receiving microprocessor outputs an encode signal for power-down to said signal modulation circuit, driving said power-receiving coil array to emit a data signal to said power-supplying module for correction of power output;

(d11) said power-receiving microprocessor drives said voltage sensor circuit to detect the voltage of said high-frequency filter capacitor of said filter circuit again, and then proceeds to step (d15) when the detected voltage is within the predetermined limit, or step (d12) if the detected voltage is not within the predetermined limit;

(d12) said power-receiving microprocessor determines whether or not the continuous voltage of said high-frequency filter capacitor of said filter circuit is excessively high. And then said power-receiving microprocessor repeats step (d08) when not excessively high, or proceeds to step (d13) when excessively high;

(d13) the status is determined to be an error;

said power-receiving microprocessor turns off said synchronizing rectifier and said first power switch and said second power switch of said filter circuit;

(d14) said power-receiving microprocessor outputs an encode signal for power interruption to said signal modulation circuit, driving said power-receiving coil array to emit a data signal to said power-supplying module for interruption of power output, and then repeats step (d01);

(d15) said power-receiving microprocessor turns on said first power switch;

(d16) said power-receiving microprocessor drives said voltage sensor circuit to detect the voltage of said low-frequency filter capacitor of said filter circuit, and then proceeds to step (d17) when the detected voltage is below the range of the predetermined limit, or step (d18) when the detected voltage is above the range of the predetermined limit;

(d17) said power-receiving microprocessor outputs an encode signal for power-up to said signal modulation circuit, driving said power-receiving coil array to emit a data signal to said power-supplying module for correction of power output, and then proceeds to step (d19);

(d18) said power-receiving microprocessor outputs an encode signal for power-down to said signal modulation circuit, driving said power-receiving coil array to emit a data signal to said power-supplying module for correction of power output;

(d19) said power-receiving microprocessor drives said voltage sensor circuit to detect the voltage of said low-frequency filter capacitor of said filter circuit again, and then proceeds to step (d20) when the detected voltage is not within the predetermined limit, or step (521) when the detected voltage is within the predetermined limit;

(d20) said power-receiving microprocessor determines whether or not the continuous voltage of said low-frequency filter capacitor of said filter circuit is excessively high. And then, said power-receiving microprocessor repeats step (d513) when not excessively high;

(d21) said power-receiving microprocessor turns on said second power switch of said filter circuit;

(d22) said second power switch of said filter circuit starts to provide DC power supply to said power output terminal of said power-receiving module for output;

(d23) said power-receiving microprocessor drives said temperature sensor module of said power-receiving module to detect the operating temperature of power-receiving end filter circuit and power-receiving end power-receiving coil array, and then proceeds to step (d24) when the detected value surpasses the predetermined limit, or step (d25) when the detected value is within the predetermined limit;

(d24) the detected temperature is excessively high, and said power-receiving microprocessor repeats step (d13); and

(d25) the detected temperature is normal, and said power-receiving microprocessor is ready for a next voltage sensing cycle and then repeats step (d07).

6. The power transmission method as claimed in claim 1, wherein said power-supplying module further comprises indicator device electrically connected to said power-supplying microprocessor, said indicator device comprising a sound module adapted for providing a warning sound and a display unit adapted for displaying the operating status of said power-supplying module.

7. The power transmission method as claimed in claim 6, wherein said sound module is selected from a group consisting of speaker and buzzer.

8. The power transmission method as claimed in claim 1, wherein said display unit is selected from a group consisting of LED indicator light set, 7-segment display and LCD module.