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Magnetic resonance wireless charging system for suppressing system radiation and stray

A wireless charging and magnetic resonance technology, applied in electrical components, circuit devices, etc., can solve the problems of aggravating space radiation, deteriorating high-frequency stray signals, impedance mismatch rectifier circuits, etc., to suppress system radiation and stray, reduce High frequency stray radiation, the effect of improving system conversion efficiency

Pending Publication Date: 2021-06-04
CHENGDU SPROUTING TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The currently disclosed magnetic resonance wireless charging system has the following disadvantages and cannot meet the demand:
[0004] (1) The design of the magnetic resonance wireless charging system is based on the system working in the best coupling state. When the receiving end moves a long distance and a large position, the magnetic resonance The resonant wireless charging system will work in the over-coupling state and under-coupling state. When the system works in the over-coupling state and under-coupling state, the efficiency is low and the space radiation will be aggravated, so that the electromagnetic compatibility of the system cannot meet the safety requirements.
[0005] (2) The receiving end of the magnetic resonance wireless charging system is generally designed as a receiving coil connected to an impedance mapping circuit to form a receiving antenna system, and then the receiving antenna system is connected to a rectifier circuit to convert radio frequency energy into DC power to supply power to electrical equipment , which will cause the impedance mismatch between the rectifier circuit and the receiving antenna system and the rectifier circuit in the switching state will deteriorate the high-frequency stray signal, and radiate the high-frequency stray signal to the space through the receiving coil, making the magnetic resonance wireless charging system unable to pass RF test standard

Method used

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  • Magnetic resonance wireless charging system for suppressing system radiation and stray
  • Magnetic resonance wireless charging system for suppressing system radiation and stray
  • Magnetic resonance wireless charging system for suppressing system radiation and stray

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Such as figure 1 As shown, a magnetic resonance wireless charging system that suppresses system radiation and strays includes an adapter, a magnetic resonance transmitting module, and a magnetic resonance receiving module;

[0051] The magnetic resonance transmission module includes a DC / DC power supply, a radio frequency power amplifier circuit, a radio frequency filter circuit 1, several secondary mapping circuits composed of LC matching and capacitor matching networks, several primary mapping circuits composed of LC matching networks, and a Bluetooth transmitter A communication circuit and a transmitting antenna; the DC / DC power supply is electrically connected to the adapter, the radio frequency power amplifier circuit and the bluetooth transmission circuit respectively, the radio frequency power amplifier circuit is electrically connected to the radio frequency filter circuit 1, and the radio frequency filter circuit 1 is connected to the radio frequency filter circ...

Embodiment 2

[0089] The change of the impedance of the antenna system after the transmitting and receiving antenna passes through the primary mapping circuit A1 and the secondary mapping circuit B1 within the distance variation range of 0cm-5cm.

[0090] according to Figure 18 The schematic diagram shown, combined with the actual application requirements, adopts the following electrical parameters for this case:

[0091] Table 1: Electrical parameters when there is only a capacitor matching network in Implementation Case 2

[0092] symbol identification value C149 58pF C147 150pF C153 150pF

[0093] Table 2: Zin values ​​measured under the electrical parameters in Table 1

[0094] distance frequency Zin 0cm 6.78Mhz 79R-23j 1cm 6.78Mhz 54R-17j 2cm 6.78Mhz 43R-10j 3cm 6.78Mhz 29R-0j 4cm 6.78Mhz 22R+3j 5cm 6.78Mhz 16R+6j

[0095] according to Figure 19 In the schematic diagram shown...

Embodiment 3

[0105] Embodiment 3: Combining the primary mapping circuit, secondary mapping circuit, and capacitor matching network of Example 2, the receiving end adopts only the capacitor matching circuit, adds a hybrid filter, and adds a primary filter and a hybrid filter.

[0106] according to Figure 21 In the schematic diagram shown, Zin is the input impedance of the antenna at the transmitting end, and ZL is the equivalent load impedance at the receiving end. Combined with the actual application requirements, the following electrical parameters are used for this case:

[0107] Table 7: The transmitting end is to add the primary mapping circuit and the secondary mapping circuit, and the receiving end only has the electrical parameters of the capacitance matching network

[0108]

[0109]

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Abstract

The invention discloses a magnetic resonance wireless charging system for suppressing system radiation and stray, and solves the problems that the input impedance and coupling strength of a transmitting end antenna are greatly changed under the condition of different coupling distances and do not match the output impedance of a power amplifier output end, so that the reflection of the power amplifier end is large, and the efficiency is low. Under different coupling conditions, due to different coupling coefficients and coupling strengths between a transmitting antenna and a receiving antenna, the input impedance of the transmitting antenna at the transmitting end has a large variation range in different distances, and the output impedance of the power amplifier has a small variation range in a certain power range; and the input impedance of the transmitting antenna seriously mismatches the output impedance of the power amplifier at a partial coupling distance, so that the spatial stray is increased. According to the invention, the input impedance of the antenna matches the output impedance change range of the power amplifier through impedance matching according to different input impedance of the antenna at different coupling distances, so that the overall efficiency is improved, and the space stray is improved.

Description

technical field [0001] The invention belongs to the technical field of wireless energy transmission, and in particular relates to a magnetic resonance wireless charging system for suppressing system radiation and stray. Background technique [0002] With the continuous development of electronic information technology, automation control technology, Internet of Things and smart home and other industries, various home appliances, consumer electronics, mobile communication equipment, etc. have been widely popularized. However, traditional household appliances rely on power cords The wired connection with the power socket is used for charging and power supply. Electronic devices with built-in batteries also need a wired connection between the charging cable and the power socket for charging, so we can see wires that provide power supply for electronic devices everywhere. As people are looking for portable devices that can fully use wireless charging, the research and application...

Claims

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Application Information

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IPC IPC(8): H02J50/23H02J50/27H02J50/70
CPCH02J50/23H02J50/27H02J50/70
Inventor 喻易强李伟刘勇罗鑫李智军
Owner CHENGDU SPROUTING TECH CO LTD
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