CN105024436A

CN105024436A - Double detection of wireless charging system

Info

Publication number: CN105024436A
Application number: CN201510501144.XA
Authority: CN
Inventors: 胡颖; 于保华
Original assignee: Suzhou Bao Run Electronic Science And Technology Co Ltd
Current assignee: Suzhou Bao Run Electronic Science And Technology Co Ltd
Priority date: 2015-08-17
Filing date: 2015-08-17
Publication date: 2015-11-04

Abstract

During the energy transmission process of wireless charging, a transmitting terminal needs to detect an input signal transmitted by a receiving terminal firstly; however, in practice, the input signal is disturbed by various noises and thus detection and determination on the receiving terminal signal by the transmitting terminal are affected. According to the invention, dual detection is carried out on an input signal by the transmitting terminal, thereby eliminating the disturbance and thus guaranteeing execution of the wireless charging function.

Description

The two of wireless charging system detect

Technical field

Wireless charging technology utilize near field respond to or inductance coupling high, by power supply unit by energy Wireless transceiver to power device, complete the wireless transmission of energy from wireless transmitting terminals to internal cell.Specifically, wireless charging transmitting terminal has a coil, when electric current is by coil time, will produce magnetic field, near field; Meanwhile, wireless charging receiving terminal also has a coil, receives the energy in this magnetic field, near field, and generation current in coil charges to load battery, and this process is exactly the wireless charging technology of electromagnetic induction.When the distance of receiving terminal and transmitting terminal becomes far away, then need to adopt electromagentic resonance technology to carry out wireless charging.The wireless charging standard of main flow has three kinds: Qi standard, PMA standard, A4WP standard.

Background technology

Based on wireless charging system framework, the process of two kinds of equipment (referring generally to energy transmitting terminal and energy acceptance end) transferring electric powers does not need the tangible electric wire existed by any physics.Adopt the advantages of wireless charging technology, safer, stable, waterproof, attractive in appearance and convenient etc. more.The energy transport of wireless charging, first transmitting terminal needs to detect the input signal that receiving terminal imports into, but under actual conditions, input signal can be subject to various noise jamming affects transmitting terminal to the detection of receiving end signal and judgement, the present invention is intended to transmitting terminal and carries out two detection to input signal, and exclusive PCR ensures the execution of wireless charging function.

Summary of the invention

First wireless charging system framework is learnt about, as Fig. 1 depicts a mobile terminal to carry out wireless charging system framework by recharging base.Mobile terminal can be that regular handset, smart mobile phone, Hand Personal Computer, Pad etc. can the portable electronic products of electromagnetic induction wireless charging.When recharging base detects mobile terminal (distance of mobile terminal recharging base distance is less than 1cm), the energy conversion unit of transmitting terminal supplies energy to transmitting coil, produces magnetic field.At receiving terminal, magnetic field energy is received by receiving coil and changes electric current into, and meanwhile, received energy unit is to the load supplying of mobile terminal.Transmitting terminal and receiving terminal have one to communicate and control unit, are responsible for induction and management wireless charging process.The communication of Fig. 1 transmitting terminal and control unit, energy conversion unit by further refinement, describe the circuit and method that perform two detection in Fig. 2 of the present invention.

In Fig. 2,8 electric capacity and 9 coils are induction coil circuit groups of recharging base (transmitting terminal), are responsible for reception and transmission that induction coil circuit group that is direct and mobile terminal (receiving terminal) carries out signal/energy.The energy conversion unit of Fig. 2 has two test point A and B, and each test point has a detector to be 6a and 6b respectively, and 5 power supplys and 7 drive circuits (bridge rectifier).The A test point circuit of Fig. 2, the input of 4a detection line is the 6a detector of energy conversion unit, and the other end is connected with the 3a filter of communication control unit, and the input signal of 6a detector exports to 1 processor by 3a filter.Communication control unit 1 processor of Fig. 2, connects 5 power supplys by 2a control line, and in energy conversion unit, the output voltage of 5 power supplys is inputs of 7 drive circuits, and namely 1 processor is by the output voltage of control 5 power supply, thus controls the input of 7 drive circuits.The B test point circuit of Fig. 2 is an auxiliary circuit similar with A test point circuit, and composition comprises and controls the input of 7 drive circuits, 3b filter, 4b detection line and 6b detector by 2b control line.

accompanying drawing illustrates:below in conjunction with accompanying drawing, the present invention is further described with enforcement.

Fig. 1 is wireless charging system framework

Fig. 2 is two testing circuits

Fig. 3 is input signal detection method

Fig. 4 is two testing processes

embodiment:the present invention wireless charging transmitting terminal to input signal detection and judge whether perform wireless charging method as shown in Figure 3:

W1. sensor circuit waveform is detected---in Fig. 2,1 processor notice 4a detection line and 6a detector detect the input waveform of A point induction coil circuit group; When W2 or W3 judged result is that NO is no, transmitting terminal can continue this W1 step and detect external input signal;

W2. whether changing---in Fig. 2,1 processor judges whether input waveform changes;

W3. whether waveform exceedes preset value---when W2 judged result is YES be, explanation has input, in Fig. 2,1 processor will by 3a filter process input waveform, and judges or whether the frequency of the average peak of waveform or the area of waveform or waveform exceedes preset value;

W4. wireless charging is carried out in power supply supercharging---and be that the input signal being input as receiving terminal is described when W3 judged result is YES, in Fig. 2, the output voltage of 5 power supplys will be increased by 2a control line by 1 processor, drive and perform wireless charging function.

W5. power supply decompression stops wireless charging---and when wireless charging function is finished, in Fig. 2, the output voltage of 5 power supplys reduces by 2a control line by 1 processor, stops wireless charging function.

The present invention performs two method detected as shown in Figure 4 at wireless charging transmitting terminal to input signal:

W6. test point waveform---in Fig. 2,1 processor reads the detection waveform of test point A and B respectively to read A, B two respectively;

W7. whether waveform A is correct---and in Fig. 2,1 processor judges that whether the waveform of test point A is the input signal (concrete criterion is as shown in Figure 3) of receiving terminal;

W8. whether waveform B is correct---and in Fig. 2,1 processor judges that whether the waveform of test point B is the input signal (concrete criterion is as shown in Figure 3) of receiving terminal;

W9. recording testing result is " 100 "---when W7 judged result is YES be, or W8 judged result is YES, in Fig. 2,1 processor for recording testing result is that " 100 " (first " 1 " is designated and reads successfully, second " 0 " is designated the failure of non-waveform display, and the 3rd " 0 " is designated non-erroneous);

W10. recording testing result is " 011 "---when W7 judged result is that NO is no, or W8 judged result is that NO is no, in Fig. 2,1 processor for recording testing result is that " 011 " (first " 0 " is designated and non-ly reads successfully, second " 1 " is designated waveform display failure, and the 3rd " 1 " is designated mistake).

Only have when testing result is for " 100 ", system just can start to perform wireless charging function.

Claims

1. in wireless charging system framework, the communication and control unit of wireless charging transmitting terminal includes processor and filter, and energy conversion unit comprises two detectors, drive circuit and power supplys, performs the two of input signal and detects.

2. based on the requirement of right 1, processor will judge the input signal of two detectors simultaneously, if any one input signal meets pre-conditioned, then power supply supercharging starts to carry out wireless charging.