CN106208417B - Wireless charging system and method for rapidly identifying number of wireless charging receiving terminals - Google Patents
Wireless charging system and method for rapidly identifying number of wireless charging receiving terminals Download PDFInfo
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Abstract
The invention discloses a wireless charging system and a method for rapidly identifying the number of wireless charging receiving terminals, wherein the wireless charging system comprises a transmitting terminal and a receiving terminal which transmit electric energy and signals through coils, and the receiving terminal comprises a rectifying circuit, an output and control circuit, a modulation signal generating circuit and a modulation circuit; the transmitting end comprises an inverter circuit, a single chip microcomputer and a demodulation circuit, and the single chip microcomputer is connected with the coil through the inverter circuit. The receiving end randomly and dynamically sends a certain number of modulation signals at intervals of a fixed time period, the sending end receives the modulation signals through the coil, demodulates and counts the modulation signals generated by different receiving ends in the same time period, and calculates the total number of the receiving ends. The technology of the invention solves the problem that when one sending end is used for charging a plurality of receiving ends, the sending end can dynamically monitor the number of the receiving ends, thereby achieving the purposes of detecting foreign matters and protecting the safety of a system.
Description
Technical Field
The invention relates to the field of wireless charging, in particular to a wireless charging system and a communication method for rapidly identifying the number of receiving terminals of wireless charging based on the wireless charging system.
Background
In a wireless charging system, a transmitting end and a receiving end may perform transmission of wireless energy. The transmission of radio energy is realized by coil resonance coupling or induction between the transmitting end and the receiving end, however, a safe and stable wireless charging system not only includes simple transmission of electric energy, but also includes some communication controls to dynamically monitor the states of the transmitting end and the receiving end. In this regard, several international alliances such as WPC and A4WP have established standards and communication protocols for wireless charging, so long as devices conforming to these standards are compatible for operation.
However, with the expansion of the wireless charging application range and some special application occasions or customized systems, a communication mechanism needs to be established simply and quickly so that the sending end can quickly identify the number of the receiving ends.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects in the prior art, the invention provides a wireless charging system and a method for quickly identifying the number of the receiving ends for wireless charging, wherein the transmitting end can dynamically monitor the number of the receiving ends during wireless charging so as to determine whether the energy provided by the transmitting end is matched with the number of the receiving ends.
The technical scheme is as follows: in order to achieve the purpose, the wireless charging system comprises a sending end and a receiving end, wherein the sending end comprises an inverter circuit, the receiving end comprises a rectifying circuit, electric energy and signals are transmitted between the inverter circuit and the rectifying circuit through a coil, the coil comprises a sending end coil and a receiving end coil, and the sending end coil and the receiving end coil are respectively connected with the inverter circuit and the rectifying circuit; the receiving end also comprises an output and control circuit arranged between the rectifying circuit and the load, a modulation signal generating circuit used for generating a modulation signal, and a modulation circuit arranged between the modulation signal generating circuit and the rectifying circuit; the transmitting end further comprises a single chip microcomputer and a demodulation circuit, the single chip microcomputer is connected with the coil through the inverter circuit, and the modulation signal received by the coil is transmitted back to the single chip microcomputer after being demodulated through the demodulation circuit.
Furthermore, the sending end also comprises a sending end detection and protection circuit connected with the single chip microcomputer, and the receiving end also comprises a receiving end protection circuit.
Further, the modulation signal generating circuit comprises a pseudo-random signal generator and a judging circuit.
The method for rapidly identifying the number of the wireless charging receiving terminals comprises the steps that each receiving terminal randomly and dynamically sends a certain number of modulation signals every other fixed time period, the modulation signals are loaded to a coil in a voltage mode, the sending terminal receives the modulation signals through the coil, demodulates and counts the modulation signals generated by different receiving terminals in the same time period, and the total number of the receiving terminals is calculated.
Further, the method for generating the modulation signal comprises the following steps: the pseudo-random signal generator generates a pseudo-random sequence, the judging circuit judges whether the pseudo-random sequence currently output by the pseudo-random signal generator is equal to a preset judging sequence or not, and if the pseudo-random sequence is equal to the judging sequence, a modulation signal is output.
Further, the pseudo-random signal generator needs an initial sequence, and the method for generating the initial sequence comprises: and when the receiving end is electrified and works, acquiring an analog signal or a digital signal in the initial state of the receiving end to generate the initial sequence.
Further, the predetermined judgment sequence may be any sequence except all "0" sequences, and the judgment sequences in each receiving end are equal.
Further, the initial sequence is obtained by acquiring a rectified voltage at a time point after a receiving end circuit is reset by a digital-to-analog converter in the receiving end.
Has the advantages that: the invention provides a communication method for rapidly identifying the number of wireless charging receiving terminals, which aims to solve the problem that when one transmitting terminal is used for charging a plurality of receiving terminals, the transmitting terminal can dynamically monitor the number of the receiving terminals, so that the transmitting terminal can confirm whether the total energy provided by the transmitting terminal is matched with the number of the receiving terminals, and further, the aims of detecting foreign matters and protecting the safety of a system are fulfilled.
Drawings
Fig. 1 is a block diagram of a wireless charging system;
fig. 2 is a modulation signal generating circuit of a receiving end;
fig. 3 is a working schematic diagram of the wireless charging system during power-on;
FIG. 4 is a schematic diagram of the system when the receiver stops charging;
fig. 5 is a working schematic diagram of the wireless charging system in which the number of the transmitting terminals is identified.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
The wireless charging system shown in fig. 1 comprises a transmitting end and a receiving end, wherein the transmitting end comprises an inverter circuit, the receiving end comprises a rectifier circuit, and electric energy and signals are transmitted between the inverter circuit and the rectifier circuit through a coil; the receiving end also comprises an output and control circuit arranged between the rectifying circuit and the load, a modulation signal generating circuit used for generating a modulation signal, and a modulation circuit arranged between the modulation signal generating circuit and the rectifying circuit; the transmitting end further comprises a single chip microcomputer and a demodulation circuit, the single chip microcomputer is connected with the coil through the inverter circuit, and the modulation signal received by the coil is transmitted back to the single chip microcomputer after being demodulated through the demodulation circuit. The modulation signal generating circuit comprises a pseudo-random signal generator and a judging circuit.
In order to ensure the safety of the system, the sending end further comprises a sending end detection and protection circuit connected with the single chip microcomputer, and the receiving end further comprises a receiving end protection circuit.
The method for rapidly identifying the number of the wireless charging receiving ends based on the wireless charging system specifically comprises the following steps: and each receiving terminal randomly and dynamically sends a certain number of modulation signals at intervals of a fixed time period, the modulation signals are loaded to the coil in a voltage mode, the sending terminal receives the modulation signals through the coil, demodulates and counts the modulation signals generated by different receiving terminals in the same time period, and calculates the total number of the receiving terminals.
The method for generating the modulation signal comprises the following steps: the pseudo-random signal generator generates a pseudo-random sequence, the judging circuit judges whether the pseudo-random sequence currently output by the pseudo-random signal generator is equal to a preset judging sequence or not, and if the pseudo-random sequence is equal to the judging sequence, a modulation signal is output. As shown in fig. 2, the pseudo-random signal generator is a linear feedback shift register, and the pseudo-random sequence has the longest pseudo-random period by selecting a suitable feedback coefficient, and the pseudo-random sequence at this time is also referred to as an m-sequence, and the m-sequence can traverse all states except all 0, that is, for an n-stage linear feedback shift register, the period of the pseudo-random sequence is p ═ 2n-1. Of modulated signalsThe generation mechanism can judge the pseudo-random sequence and a preset judgment sequence { a) by the judgment circuitcWhether the pseudo-random sequence is equal to the judgment sequence { a }cWhen the two phases are equal, a modulation signal of one period is sent out.
The pseudo-random signal generator initial sequence a0The generation method comprises the following steps: and when the receiving end is electrified and works, acquiring an analog signal or a digital signal in the initial state of the receiving end to generate the initial sequence. Due to the difference of the receiving ends and the difference of the time and the position of the receiving ends on the transmitting ends, the { a ] obtained by each receiving end can be ensured0The modulation signals are not equal to each other, so that the problem that the modulation signals sent by different receiving ends are possibly overlapped is avoided to the maximum extent. Wherein in the present invention { a0And acquiring the rectified voltage at a certain time point after the receiving end circuit is reset through an analog-to-digital converter (ADC).
The specific working process of the system is as follows: as shown in fig. 3, after the transmitting end is powered on, the single chip microcomputer can work, at this time, the transmitting end enters a "Ping stage" first, that is, a detection waiting stage, the single chip microcomputer intermittently transmits a short-time pulse width modulation signal (PWM wave) with a tping time as a period, the PWM wave drives the inverter circuit to work, so that alternating current and voltage pass through two ends of the coil, at this time, if a receiving end exists on the transmitting end coil, the receiving end coil can sense the voltage, the transmitting end can judge that the receiving end exists through the current change on the coil, so as to enter a normal working stage (Power Transfer stage), the single chip microcomputer at the transmitting end continuously transmits the PWM wave, and the receiving end starts charging after a delay of Tdelay time, so that the transmitting end can continuously provide energy to the receiving end; if the sender detects that no receiver exists, the sender is always in the Ping stage. When the receiving end stops charging (full charge or is taken away from the transmitting end), as shown in fig. 4, the single chip microcomputer of the transmitting end does not immediately stop transmitting the PWM wave until the transmitting end does not detect the modulation signal within a fixed time period, which indicates that the receiving end stops charging, the transmitting end stops continuously transmitting the PWM wave, at this time, the transmitting end enters a detection waiting stage (Ping stage) from a normal working stage (Power Transfer stage), and there is a time delay of Toff between the time when the receiving end stops charging and the time when the transmitting end stops transmitting the PWM wave.
After the transmitting end enters a normal working stage (Power Transfer stage), alternating Voltage (VAC) received by the receiving end through the coil is rectified and then changed into direct current Voltage (VRECT), so that a charging circuit of the receiving end can work normally. The receiving end charging circuit is mainly used for rectifying the alternating voltage on the coil and providing stable direct current output for a load after some output control circuits, and the stable voltage output or current output can be realized; in addition, a modulation signal generating circuit at the receiving end also works to output modulation signal pulses, and the modulation signals are loaded to two ends of the coil through the modulation circuit. The sending end receives the modulation signals and considers the receiving end to be effective after demodulation, and the sending end can judge how many receiving ends are effective by counting the modulation signals in a period; because the power received by each receiving end is basically consistent, the number of the receiving ends and the power output by the transmitting end are compared at the transmitting end to judge whether the system normally works, if the transmitting power is greater than the total required power of the receiving ends, the transmitting end judges that foreign matters exist, the transmitting end gives an alarm prompt or directly turns off the output, and therefore the safety of the system is protected. As shown in fig. 5, the receiving terminals Rx1 and Rx2 … … Rx16 respectively transmit a modulated signal pulse in each time period T, and the transmitting terminal counts the number of received pulse signals in the same time period to determine the number of receiving terminals.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (3)
1. The method for rapidly identifying the number of the wireless charging receiving ends is characterized in that: the wireless charging system is applied to a wireless charging system, the wireless charging system comprises a sending end and a receiving end, the sending end comprises an inverter circuit, the receiving end comprises a rectifier circuit, and electric energy and signals are transmitted between the inverter circuit and the rectifier circuit through a coil; the receiving end also comprises an output and control circuit arranged between the rectifying circuit and the load, a modulation signal generating circuit used for generating a modulation signal, and a modulation circuit arranged between the modulation signal generating circuit and the rectifying circuit; the transmitting end also comprises a single chip microcomputer and a demodulation circuit, the single chip microcomputer is connected with the coil through the inverter circuit, and the modulation signal received by the coil is demodulated through the demodulation circuit and then transmitted back to the single chip microcomputer; the modulation signal generating circuit comprises a pseudo-random signal generator and a judging circuit;
the method comprises the following steps: each receiving terminal randomly and dynamically sends a certain number of modulation signals every other fixed time period, the modulation signals are loaded to the coil in a voltage mode, the sending terminal receives the modulation signals through the coil, demodulates and counts the modulation signals generated by different receiving terminals in the same time period, and calculates the total number of the receiving terminals; the method for generating the modulation signal comprises the following steps: the pseudo-random signal generator generates a pseudo-random sequence, the pseudo-random sequence generated by the pseudo-random signal generator can traverse all states except all 0 states, the judging circuit judges whether the pseudo-random sequence currently output by the pseudo-random signal generator is equal to a preset judging sequence or not, and if the pseudo-random sequence is equal to the judging sequence, a modulation signal is output; the judging sequences of all the receiving ends are equal; the pseudo-random signal generator needs an initial sequence, and the initial sequences of the pseudo-random signal generators of all receiving ends are unequal; the generation method of the initial sequence comprises the following steps: and when the receiving end is electrified and works, acquiring an analog signal or a digital signal in the initial state of the receiving end to generate the initial sequence.
2. The method for rapidly identifying the number of receiving terminals for wireless charging according to claim 1, wherein: the preset judgment sequence can be any sequence except all '0' sequences, and the judgment sequences in all the receiving ends are equal.
3. The method for rapidly identifying the number of receiving terminals for wireless charging according to claim 1, wherein: the initial sequence is obtained by acquiring the rectified voltage of a receiving end circuit at a time point after the receiving end circuit is reset through a digital-to-analog converter in the receiving end.
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| CN107332360B (en) * | 2017-08-11 | 2019-12-20 | 宁波微鹅电子科技有限公司 | Wireless electric energy transmission system, electric energy transmitting terminal, electric energy receiving terminal and detection method |
| CN107612347A (en) * | 2017-09-29 | 2018-01-19 | 哈尔滨工业大学 | Wireless energy and data synchronization transmissions system based on bilateral LCC compensation |
| CN108039894A (en) * | 2017-12-05 | 2018-05-15 | 无锡市瀚为科技有限公司 | Suitable for the communication disturbance restraining method between the multiple transmitting terminals of wireless charging system |
| CN108092657B (en) * | 2018-01-04 | 2021-09-03 | 无锡市瀚为科技有限公司 | Capacitive touch switch with structured touch electrode and triggering method thereof |
| CN112564300B (en) * | 2020-12-03 | 2023-05-26 | 维沃移动通信有限公司 | Wireless charging receiving end, method and device and electronic equipment |
| CN113141063A (en) * | 2020-12-11 | 2021-07-20 | 未来穿戴技术有限公司 | Wireless power supply control method of fascia gun, fascia gun and readable storage medium |
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| CN102625423B (en) * | 2011-03-10 | 2015-06-03 | 深圳市华奥通通信技术有限公司 | Wireless communication system and wake up method thereof |
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| CN1819538A (en) * | 2005-02-09 | 2006-08-16 | 索尼株式会社 | Wireless communication apparatus, wireless communication method, and program |
| CN101452517A (en) * | 2008-12-29 | 2009-06-10 | 浙江大学 | Wireless passive radio frequency sensing system anti-collision data-transmission method |
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