CN208874367U - Radio energy transmitting terminal, wireless charging system and circuit module - Google Patents
Radio energy transmitting terminal, wireless charging system and circuit module Download PDFInfo
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- CN208874367U CN208874367U CN201821129985.8U CN201821129985U CN208874367U CN 208874367 U CN208874367 U CN 208874367U CN 201821129985 U CN201821129985 U CN 201821129985U CN 208874367 U CN208874367 U CN 208874367U
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Abstract
Disclose a kind of radio energy transmitting terminal, wireless charging system and circuit module, wherein radio energy transmitting terminal includes emitting side resonance circuit, it is configured as wirelessly emitting electric energy, the emitting side resonance circuit includes electric energy transmitting coil and emitting side resonant capacitance, and the electric energy transmitting coil is connected with the emitting side resonant capacitance；Current sample element is connected with the emitting side resonance circuit；Inverter circuit is configured as exporting high-frequency alternating current to the emitting side resonance circuit；Current detection circuit is connect with the current sample element, is configured as obtaining the peak value of the electric current of the emitting side resonance circuit；And transmitting side controller, it is configured as controlling the working condition of the inverter circuit.The utility model embodiment is by increasing a current sample element in radio energy transmitting terminal and obtaining the electric current of radio energy transmitting terminal by the electric current of detection current sample element, so as to detect the electric current of electric energy transmitting coil more accurately.
Description
Technical field
The utility model relates to wireless charging technical fields, and in particular to a kind of radio energy transmitting terminal, wireless charging system
System and circuit module.
Background technique
Wireless charging system can pass between radio energy transmitting terminal and radio energy receiving end in a non-contact manner
Pass electric energy.
Fig. 1 is the circuit diagram of the wireless charging system of the prior art.As shown in Figure 1, radio energy transmitting terminal 1 includes inversion
Circuit 11, emitting side resonance circuit 12 and transmitting side controller 13, radio energy receiving end 2 include 21 He of receiving side resonance circuit
Rectification circuit 22.Emitting side resonance circuit 12 and receiving side resonance circuit 21 pass through the alternating magnetic field of resonant frequency with non-contacting
Mode intercouples, to realize that radio energy transmits.Transmitting side controller 13 is used to control the working condition of inverter circuit 11.
Existing wireless charging system passes through sampling emitting side resonant capacitance for the overcurrent protection of radio energy transmitting terminal
Electric current realize, since there are errors for the electric current and capacitor's capacity of the electric current lagging circuit of capacitor, so that the electric current obtained has
Error, overcurrent protection cannot be carried out timely and accurately, by the element in losser circuit.Meanwhile with the input work of inverter circuit
The increase of rate, when radio energy transmitting terminal foreign matter lesser there are resistance, due to current detecting inaccuracy, so that foreign bodies detection
Effect is poor, and then may cause the protection to radio energy transmitting terminal not in time.
Utility model content
In view of this, the utility model embodiment proposes a kind of radio energy transmitting terminal and wireless charging system, so that
The electric current that emitting side resonance circuit can accurately be obtained, controls the working condition of inverter circuit, to realize radio energy
The overcurrent protection of transmitting terminal and foreign bodies detection.
According to the utility model embodiment in a first aspect, providing a kind of radio energy transmitting terminal, comprising:
Emitting side resonance circuit is configured as wirelessly emitting electric energy；
Current sample element is connected with the emitting side resonance circuit；
Inverter circuit is configured as exporting high-frequency alternating current to the emitting side resonance circuit；
Current detection circuit is connect with the current sample element, is configured as obtaining the emitting side resonance circuit
The peak value of electric current；And
Emit side controller, is configured as controlling the working condition of the inverter circuit.
Preferably, the emitting side resonance circuit includes:
Electric energy transmitting coil；And
Emitting side resonant capacitance is connected with the electric energy transmitting coil.
The preferably described current sample element are as follows:
Current transformer；Or
Sampling resistor.
Preferably, the current detection circuit includes peak detection circuit.
Preferably, the peak value of the electric current of the transmitting side controller in the emitting side resonance circuit or virtual value are high
The inverter circuit is controlled when predetermined threshold to stop working.
Preferably, the transmitting side controller is configured as calculating the emitting side resonance according to the virtual value of the electric current
The value and power reference of circuit controls the inversion electricity when the difference of input power and the value and power reference meets predetermined condition
Road stops working.
Preferably, the transmitting side controller is configured as the voltage disturbance for detecting the electric energy transmitting circuit or power is disturbed
The dynamic output power to obtain the electric energy transmitting coil of electric energy receiving end feedback.
According to the second aspect of the utility model embodiment, a kind of wireless charging system is provided, comprising:
Radio energy transmitting terminal as described in relation to the first aspect；And
At least one radio energy receiving end is configured as wirelessly receiving the radio energy transmitting terminal transmitting
Electric energy.
According to the third aspect of the utility model embodiment, a kind of circuit module is provided, comprising:
Electric energy transmitting coil；
Emitting side resonant capacitance；And
Current sample element is connected with the electric energy transmitting coil and the emitting side resonant capacitance.
Preferably, the current sample element are as follows:
Current transformer；Or
Sampling resistor.
Disclose a kind of radio energy transmitting terminal, wireless charging system and circuit module.The utility model embodiment passes through
Increase a current sample element in radio energy transmitting terminal and radio energy is obtained by the electric current of detection current sample element
The electric current of transmitting terminal, so as to detect the electric current of electric energy transmitting coil more accurately.
Detailed description of the invention
By referring to the drawings to the description of the utility model embodiment, the above-mentioned and other mesh of the utility model
, feature and advantage will be apparent from, in the accompanying drawings:
Fig. 1 is the circuit diagram of the wireless charging system of the prior art；
Fig. 2 is the circuit diagram of the radio energy transmitting terminal of the utility model embodiment；
Fig. 3 is the circuit diagram of the radio energy transmitting terminal of an optional implementation of the utility model；
Fig. 4 is the circuit diagram of the radio energy transmitting terminal of another optional implementation of the utility model.
Specific embodiment
The utility model is described below based on embodiment, but the utility model is not restricted to these implementations
Example.It is detailed to describe some specific detail sections below in the datail description of the utility model.To those skilled in the art
The utility model can also be understood completely in the description of part without these details for member.In order to avoid obscuring the utility model
Essence, there is no narrations in detail for well known method, process, process, element and circuit.
In addition, it should be understood by one skilled in the art that provided herein attached drawing be provided to explanation purpose, and
What attached drawing was not necessarily drawn to scale.
It will also be appreciated that in the following description, " circuit " refers to be passed through electrically by least one element or sub-circuit
The galvanic circle that connection or electromagnetism connect and compose.When title element or the " connection of another element of circuit " being connected to " or element/circuit
" between two nodes when, it, which can be, is directly coupled or connected another element or there may be intermediary element, element it
Between connection can be physically, in logic or its combination.On the contrary, when claiming element " being directly coupled to " or " directly connecting
Be connected to " another element when, it is meant that the two be not present intermediary element.
Unless the context clearly requires otherwise, "include", "comprise" otherwise throughout the specification and claims etc. are similar
Word should be construed as the meaning for including rather than exclusive or exhaustive meaning；That is, be " including but not limited to " contains
Justice.
In the description of the present invention, it should be understood that term " first ", " second " etc. are used for description purposes only,
It is not understood to indicate or imply relative importance.In addition, in the description of the present invention, unless otherwise indicated, it is " more
It is a " it is meant that two or more.
Fig. 2 is the circuit diagram of the radio energy transmitting terminal of the utility model embodiment.As shown in Fig. 2, the nothing of the present embodiment
Line electric energy transmitting terminal 3 includes inverter circuit 31, emitting side resonance circuit 32, transmitting side controller 33,34 and of current detection circuit
Current sample element 35.Wherein, inverter circuit 31 is configured as exporting high-frequency alternating current to emitting side resonance circuit 32.Emitting side
Resonance circuit 32 is configured as humorous with the receiving side of corresponding radio energy receiving end (not marking in figure) in a non-contact manner
The circuit that shakes couples, to wirelessly emit electric energy.Emitting side resonance circuit 32 is connected with current sample element 35.It is preferred that
Ground, emitting side resonance circuit 32 include electric energy transmitting coil Ls and emitting side resonant capacitance Cs, the two series connection, in high-frequency alternating current
Driving under resonance generate frequency be predetermined work frequency f0Alternating magnetic field.Current detection circuit 34 and current sample element 35
Connection is configured as the peak value of the electric current of detection emitting side resonance circuit 32.Due to current sample element 35 and emitting side resonance
Circuit 32 is connected, and can accurately obtain emitting side resonance circuit 32 by detecting the peak value of electric current of current sample element 35
The peak value of electric current.Transmitting side controller 33 is connect with current detection circuit 34, receives the electric current inspection that current detection circuit 34 exports
Survey signal IP.It should be understood that current detection signal IP can be the voltage or current signal of simulation, or by current detection value
Convert the digital signal obtained.Transmitting side controller 33 is configured as the working condition of control inverter circuit 31.Specifically, emit
Side controller 33 can control the working condition of inverter circuit 31 according to current detection signal IP to carry out overcurrent protection and different
Analyte detection protection.Wherein, current detection signal IP is used to characterize the peak value for the electric current for flowing through emitting side resonance circuit 32.According to electricity
The virtual value of the available electric current of the peak value of stream.Specifically, in alternating current, the peak value of electric current is virtual valueTimes.Its
In, current detection circuit 34 includes peak detection circuit 34 '.In the present embodiment, current sample element 35 is in real time or basic
In real time conversion output with the curent change flowed through signal element, it is described with flow through curent change signal can for electricity
Flowing signal may be voltage signal.
Specifically, when carrying out overcurrent protection to radio energy transmitting terminal 3, transmitting side controller 33 is in emitting side resonance electricity
Control inverter circuit stops working when the peak value or virtual value of the electric current on road 32 are higher than predetermined threshold.Pass through detection current sample member
The peak value of the electric current of part 35 relatively can accurately and almost without delay obtain the peak value of the electric current of emitting side resonance circuit 32.?
When current detection circuit 34 detects the peak value or excessive virtual value of the electric current of emitting side resonance circuit 32, emit side controller 33
Inverter circuit 31 can be controlled at once to stop working, to protect each element of radio energy transmitting terminal 3, improve overcurrent protection
Reliability.
When carrying out foreign bodies detection to radio energy transmitting terminal 3, transmitting side controller is configured as according to current peak meter
The value and power reference for calculating emitting side resonance circuit meets predetermined condition time control in the difference of input power and the value and power reference
The inverter circuit is made to stop working.Usually the resistance of each element will receive the shadow of temperature during circuit communication
It rings, and testing result of electric current etc. can also have certain error, therefore can also have one by calculating the value and power reference obtained
Determine deviation, needs to determine that reasonable predetermined condition obtains more accurate foreign bodies detection model according to situations such as temperature, realize more smart
Quasi- foreign bodies detection.
The utility model embodiment is by increasing a current sample element in radio energy transmitting terminal and by detection electricity
The electric current for flowing sampling element obtains the electric current of radio energy transmitting terminal, so as to detect electric energy transmitting coil more accurately
Electric current, and then overcurrent protection and foreign bodies detection can be more precisely carried out, improve radio energy transmission system safety and
Reliability.
Fig. 3 is the circuit diagram of the radio energy transmitting terminal of an optional implementation of the utility model, as shown in figure 3,
The current sample element of the utility model embodiment is current transformer 351.The first side winding and transmitting of current transformer 351
Side resonance circuit 32 is connected, and secondary side winding is connected to current detection circuit 34.Preferably, can in current detection circuit 34 or
Emit setting signal amplifying circuit in side controller 33.Signal amplification circuit is configured the secondary side of strengthening electric current mutual inductor 351
The current detection signal of winding obtains the current detection signal IP of emitting side resonance circuit 32.Transmitting side controller 33 is configured as
Value and power reference can be calculated according to current detection signal IP.Value and power reference is electric for being characterized under current load condition
The normal output power of energy transmitting terminal.Value and power reference can calculate according to the following formula:
Pin_ref=P1+P2+P3+Pout
Wherein, Pin_ref is the value and power reference；
P1 is the loss power of the electric energy transmitting coil,
P2 is the conduction loss of the inverter circuit,
P3 is the switching loss of the inverter circuit, P3=fkVinIp；And
Pout is the output power of the electric energy transmitting coil of electric energy receiving end feedback.
Wherein, IpFor the virtual value for the electric current that detection obtains, RacFor the equivalent impedance of the electric energy transmitting coil,
RdsonFor the equivalent impedance of the inverter circuit, fk is the loss factor of the inverter circuit switching process, VinFor the inversion
The input voltage of circuit.In general, when the access of radio energy receiving end, voltage, temperature, the output power of radio energy receiving end
Equal signals can feed back radio energy transmitting terminal.For example, can be fed back by wireless near field communication connection.Wherein,
Wireless near field communication connection includes the communication connection based on technologies such as bluetooth, near-field communication NFC, infrared communications.In another example can
To carry out information feedback by carrying out voltage disturbance or power disturbance in radio energy receiving end.Voltage/power disturbance is logical
The output power or output voltage for changing radio energy receiving end are crossed, so that the emitting side resonance circuit of radio energy transmitting terminal
Output parameter accordingly changes.Feedback information can be obtained by the output parameter of detection emitting side resonance circuit as a result,.
For example, radio energy transmitting terminal can be made come short circuit load according to feedback information coding by radio energy receiving end side
Output electric current change with the load of radio energy receiving end and change, therefore the electric current of emitting side resonance circuit can be passed through
The variation detection of virtual value obtains the output power of radio energy receiving end.It is possible thereby in the input work of radio energy transmitting terminal
The difference of rate and the value and power reference controls the inverter circuit when meeting predetermined condition and stops working.Specifically, wireless
When the difference of the input power of electric energy transmitting terminal and the value and power reference is greater than predetermined threshold, illustrate that radio energy transmitting terminal removes
Outside to radio energy receiving end output power and other possible losses, also to other object output powers, therefore can
With judgement, there are foreign matters.
In this implementation, when radio energy transmitting terminal is in running order, for the ease of detecting emitting side resonance
Electric current in circuit converts electric current using current transformer (Current Transformer, CT).It specifically, can be with
Using traditional electromagnetic current transducer, traditional electromagnetic current transducer be according to electromagnetic induction principle by primary side around
The instrument that the low current that high current in group is converted in secondary side winding measures.The first side winding circle of current transformer
Number seldom, is connected, secondary side winding the number of turns is more, connect with current detection circuit 34 with emitting side resonance circuit 32.Meanwhile
Can use relatively advanced electronic current mutual inductor, such as optical current sensor, hollow coil current transformer (
That is, Rogowski coil formula current transformer), iron-core coil low power current transformer (LPCT), frequency conversion current sensor
Deng.Electronic current mutual inductor Electro Magnetic Compatibility is more preferable, and amplitude-frequency characteristic and phase-frequency characteristic are more preferable, can be in wide cut value, frequency, phase
Higher measurement accuracy is obtained in the range of position, and new error will not be introduced, transformer error is exactly systematic error.Current transformer
Precision be divided into a variety of ranks, it is possible thereby to obtain the electric current of different accuracy, obtain the foreign bodies detection model of different accuracy,
Realize the foreign bodies detection of different accuracy.
Time delay there's almost no as current sample element using current transformer, therefore detect the current detection value obtained
It is more accurate.Simultaneously as current transformer can convert electric current, the electric current of secondary side can be much smaller than primary side
Electric current therefore can reduce the electric current for being applied to current detection circuit so that current detection circuit can be lesser
It works under current or voltage environment, reduces the manufacturing cost of circuit.Meanwhile it can be carried out using current transformer high-power, big
The loss of current detecting, current transformer can be ignored.
Fig. 4 is the circuit diagram of the radio energy transmitting terminal of another optional embodiment of the utility model.Such as Fig. 4 institute
Show, the current sample element of the utility model embodiment is sampling resistor Rsense.Sampling resistor Rsense and emitting side resonance
Circuit 32 is connected, and current detection circuit 34 is connected in parallel on the both ends sampling resistor Rsense.It is possible thereby to which it is humorous to accurately obtain emitting side
The peak value of the electric current of vibration circuit 32.It is alternatively possible to obtain the electric current of emitting side resonance circuit 32 by the way of difference sampling
Peak value, keep sampling precision.After the peak value for obtaining the electric current of emitting side resonance circuit 32, power reference can be calculated
Value:
Pin_ref=P1+P2+P3+P4+Pout
Wherein, Pin_ref is the value and power reference；
P1 is the loss of the electric energy transmitting coil,
P2 is the conduction loss of the inverter circuit,
P3 is the switching loss of the inverter circuit, P3=fkVinIp；
P4 is the loss of the sampling resistor,And
Pout is the output power of the electric energy transmitting coil of electric energy receiving end feedback；
Wherein, IpFor the virtual value for the electric current that detection obtains, RacFor the equivalent impedance of the electric energy transmitting coil,
RdsonFor the equivalent impedance of the inverter circuit, fk is the loss factor of the inverter circuit switching process, VinFor the inversion
The input voltage of circuit, RsenseFor the equivalent impedance of the sampling resistor Rsense.In general, when radio energy receiving end is accessed
When, the signals such as voltage, temperature, output power of radio energy receiving end can feed back radio energy transmitting terminal.For example, can lead to
Wireless near field communication connection is crossed to be fed back.Wherein, wireless near field communication connection includes being based on bluetooth, near-field communication
The communication connection of the technologies such as NFC, infrared communication.In another example can be by carrying out voltage disturbance or function in radio energy receiving end
Rate disturbs to carry out information feedback.Voltage/power disturbance is the output power or output electricity by changing radio energy receiving end
Pressure, so that the output parameter of the emitting side resonance circuit of radio energy transmitting terminal accordingly changes.Pass through detection transmitting as a result,
The output parameter of side resonance circuit can obtain feedback information.For example, by radio energy receiving end side according to feedback letter
Breath coding comes short circuit load, can make radio energy transmitting terminal output electric current with radio energy receiving end load variation and
Change, therefore the defeated of radio energy receiving end can be obtained by the variation detection of the virtual value of the electric current of emitting side resonance circuit
Power out.It is possible thereby to when the input power of radio energy transmitting terminal and the difference of the value and power reference meet predetermined condition
The inverter circuit is controlled to stop working.Specifically, in the input power of radio energy transmitting terminal and the value and power reference
When difference is greater than predetermined threshold, illustrate radio energy transmitting terminal in addition to radio energy receiving end output power and other possibility
Loss outside, also to other object output powers, therefore may determine that there are foreign matters.
It is commonly used for the resistance value very little of the sampling resistor of current sample, sampling resistor is suitable for small-power, low current is examined
It surveys, it is therefore desirable to consider the loss of sampling resistor to obtain more accurately foreign bodies detection model.Specifically, the essence of sampling resistor
Degree is equally divided into a variety of ranks, it is possible thereby to obtain the electric current of different accuracy, obtains the foreign bodies detection model of different accuracy,
Realize the foreign bodies detection of different accuracy.
In the utility model embodiment, delay there's almost no as current sample element using sampling resistor, therefore
The electric current of acquisition is more accurate.Sampling resistor is suitable for small-power, low current detects, and is emitted using the radio energy of sampling resistor
The circuit connection at end is easily achieved.But sampling resistor will increase the excess loss of radio energy transmitting terminal, therefore equally can root
According to the sampling resistor of actual needs selection different accuracy.
The utility model embodiment is by increasing a current sample element in radio energy transmitting terminal and by detection electricity
The electric current for flowing sampling element obtains the electric current of radio energy transmitting terminal, to carry out more accurate overcurrent to radio energy transmitting terminal
Protection and foreign bodies detection.
The radio energy transmitting terminal of various embodiments of the utility model can be with existing mode of resonance radio energy receiving end
With the use of composition wireless charging system.
The current sample element of various embodiments of the utility model can be sent out with existing emitting side resonant capacitance and electric energy
Ray circle circuit module in series.
The above is only the preferred embodiment of the present invention, is not intended to limit the utility model, for this field
For technical staff, the utility model can have various modifications and changes.All institutes within the spirit and principle of the utility model
Any modification, equivalent substitution, improvement and etc. of work, should be included within the scope of protection of this utility model.
Claims (9)
1. a kind of radio energy transmitting terminal, which is characterized in that the radio energy transmitting terminal includes:
Emitting side resonance circuit is configured as wirelessly emitting electric energy, and the emitting side resonance circuit includes electric energy hair
Ray circle and emitting side resonant capacitance, the electric energy transmitting coil are connected with the emitting side resonant capacitance；
Current sample element is connected with the emitting side resonance circuit；
Inverter circuit is configured as exporting high-frequency alternating current to the emitting side resonance circuit；
Current detection circuit is connect with the current sample element, is configured as obtaining the electric current of the emitting side resonance circuit
Peak value；And
Emit side controller, is configured as controlling the working condition of the inverter circuit.
2. radio energy transmitting terminal according to claim 1, which is characterized in that the current sample element are as follows:
Current transformer；Or
Sampling resistor.
3. radio energy transmitting terminal according to claim 1, which is characterized in that the current detection circuit includes peak value inspection
Slowdown monitoring circuit.
4. radio energy transmitting terminal according to claim 1, which is characterized in that the transmitting side controller is in the transmitting
The peak value or virtual value of the electric current of side resonance circuit control the inverter circuit when being higher than predetermined threshold and stop working.
5. radio energy transmitting terminal according to claim 1, which is characterized in that the transmitting side controller is configured as root
The value and power reference that the emitting side resonance circuit is calculated according to the virtual value of the electric current, in input power and the power reference
The difference of value controls the inverter circuit and stops working when meeting predetermined condition.
6. radio energy transmitting terminal according to claim 1, which is characterized in that the transmitting side controller is configured as examining
Voltage disturbance or the power disturbance of the emitting side resonance circuit are surveyed to obtain the electric energy emission lines of electric energy receiving end feedback
The output power of circle.
7. a kind of wireless charging system, which is characterized in that the system comprises:
Such as radio energy transmitting terminal of any of claims 1-6；And
At least one radio energy receiving end is configured as wirelessly receiving the electricity of the radio energy transmitting terminal transmitting
Energy.
8. a kind of circuit module, which is characterized in that the circuit module includes:
Electric energy transmitting coil；
Emitting side resonant capacitance；And
Current sample element is connected with the electric energy transmitting coil and the emitting side resonant capacitance.
9. circuit module according to claim 8, which is characterized in that the current sample element are as follows:
Current transformer；Or
Sampling resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821129985.8U CN208874367U (en) | 2018-07-17 | 2018-07-17 | Radio energy transmitting terminal, wireless charging system and circuit module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821129985.8U CN208874367U (en) | 2018-07-17 | 2018-07-17 | Radio energy transmitting terminal, wireless charging system and circuit module |
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| Publication Number | Publication Date |
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| CN208874367U true CN208874367U (en) | 2019-05-17 |
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ID=66463046
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| CN201821129985.8U Active CN208874367U (en) | 2018-07-17 | 2018-07-17 | Radio energy transmitting terminal, wireless charging system and circuit module |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112868163A (en) * | 2019-08-07 | 2021-05-28 | 华为技术有限公司 | Wireless charging device, position detection method and system |
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2018
- 2018-07-17 CN CN201821129985.8U patent/CN208874367U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112868163A (en) * | 2019-08-07 | 2021-05-28 | 华为技术有限公司 | Wireless charging device, position detection method and system |
| CN113039700A (en) * | 2019-08-07 | 2021-06-25 | 华为技术有限公司 | Wireless charging device, position detection method and system |
| CN112868163B (en) * | 2019-08-07 | 2024-05-17 | 华为数字能源技术有限公司 | Wireless charging device, position detection method and system |
| CN113039700B (en) * | 2019-08-07 | 2024-06-11 | 华为数字能源技术有限公司 | Wireless charging device, position detection method and system |
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