CN206894366U - Inductive load detection circuit, reactance compensation device, power emitting unit and system - Google Patents
Inductive load detection circuit, reactance compensation device, power emitting unit and system Download PDFInfo
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- CN206894366U CN206894366U CN201720420082.4U CN201720420082U CN206894366U CN 206894366 U CN206894366 U CN 206894366U CN 201720420082 U CN201720420082 U CN 201720420082U CN 206894366 U CN206894366 U CN 206894366U
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Abstract
Wireless charging field is the utility model is related to, discloses a kind of inductive load detection circuit, reactance compensation device, wireless charging power emitting unit and wireless charging system.Inductive load detects circuit in the utility model, applied to power amplification circuit, including triggers circuit, waveform generating circuit and comparator；Triggers circuit is connected with the drain electrode of the first power switch pipe in power amplification circuit, and the triggers circuit is connected with the input of the waveform generating circuit, and the wave period of waveform generating circuit generation is controlled for triggering；The first input end of comparator electrically connects with the output end of the waveform generating circuit, the second input input predeterminated voltage of the comparator, the output end output inductive load testing result of comparator；The predeterminated voltage is the threshold voltage of the inductive load.Present embodiment fast and accurately detect inductive load in power amplification circuit, can optimize the efficiency of wireless charging system according to testing result, it is ensured that the safety of power amplifier.
Description
Technical field
The utility model is related to wireless charging field, more particularly to a kind of inductive load detection circuit, reactance compensation device,
Power emitting unit and system.
Background technology
Magnetic field resonance type wireless charging is realized using the magnetic coupling between transmitting coil and receiving coil, basic nothing
Micro USB electric system includes power emitting unit (Power Transmitter Unit, PTU) and power receiving unit (Power
Receiving Unit, PRU), wireless charging system block diagram as shown in Figure 1, wherein, PTU includes transmitting coil, power is put
Big circuit, matching network and input impedance Zin, PRU include receiving coil, rectification unit and DC load.Wireless charging system
PTU and PRU putting position is as shown in Figure 2 in system.Such as wireless charging alliance (Alliance for Wireless Power,
Referred to as " A4WP ") use the technology.Due to the advantage such as the topological structure of E power-like amplifiers is accurate and efficiency is high, in magnetic field
Increasingly main flow is become using switching regulator E power-like amplifiers in resonance type wireless charging system.
In resonance type wireless charging system, in order to optimize the efficiency of whole system, the load of power amplifier need to be ensured
In limited range.Such as the safe input impedance Zin scopes that Fig. 3 is an E class A amplifier A, if input impedance Zin is beyond peace
Full input impedance Zin scopes, input impedance Zin deviations perception or deviation capacitive, will cause whole wireless charging system efficiency
Decline, even result in the damage of component.
In resonance type wireless charging system, the fluctuation range of input impedance is big, and longer charging distance, bigger fills
Electric scope and the compatibility for different sized devices so that input impedance Zin fluctuation range becomes much larger, for example, flat board
Computer or notebook computer etc..In order to reduce input impedance Zin fluctuation range, increase between transmitting end-coil and matching network
Add switching capacity realize automatic tuning circuit, different capacitor combinations can adjust input impedance Zin return to it is comparatively safe
Region.But due to adjustable range, the limitation of step-length and response delay is adjusted, when being quickly put into or remove equipment on PTU
When, region that input impedance Zin may still be at beyond safe range.
Therefore, it is very necessary to carry out load detecting to power amplification circuit.
Inventor has found that load detection method usually used at present is to utilize voltage during the present invention is realized,
What current sensor and phase detectors were realized.Fig. 4 is that prior art utilizes voltage sensor, current sensor and phase-detection
The circuit diagram for the load detecting that device is carried out, voltage sensor and phase detectors are connected electrically in switched mode power amplifier and PTU
Between transmitting coil, and it is connected with tuning circuit.By voltage amplitude (V), current amplitude (I), the phase between electric current and voltage
Position φ is input in the analog-digital converter of microcontroller, to determine trigger condition.Then, microcontroller passes through equation below
1~3 is calculated load impedance：
| Z |=| V |/| I | (1)
R=| Z | cos φ (2)
JX=j | Z | sin φ (3)
Microcontroller determines whether automatic tuning circuit needs to turn on or close according to the imaginary impedance jX values calculated
Break more tuning capacitances.But this load detecting circuit calculates phase place change so as to control tuning electricity by microcontroller
Road capacitance value, delay be present, for the imaginary impedance of possible fast-changing PTU coils, detection is inaccurate, it is impossible to
Ensure the change of input impedance in safe range.
In order to solve the delay issue of microcontroller, and then there is the drain electrode crest voltage progress using power switch pipe
The circuit of load detecting, still, the detection offset by the drain crest voltage of power switch pipe come the imaginary impedance that carries out, when
When load is in capacitive region and partial perceptual region, drain crest voltage can reduce as the value of imaginary impedance becomes big；
When load is in the larger region of perception, drain voltage peak value can become big as the value of imaginary impedance becomes big.Therefore, load
The perceptual constant interval larger in one, drain voltage peak value and imaginary impedance are not single transformation relations, and this can make tune
Humorous circuit produces the operation of mistake, so as to cause to damage power amplification when the big equipment of size is put into or removes charged area
Device, the circuit that load detecting is carried out using the drain electrode peak value of power switch pipe can not be carried out reliably accurately to inductive load
, certain potential safety hazard be present in detection.
Utility model content
The purpose of this utility model is to provide a kind of inductive load detection circuit, reactance compensation device, power emission list
Member and system so that inductive load can be fast and accurately detected in power amplification circuit, with can be excellent according to testing result
Change the efficiency of wireless charging system, it is ensured that the safety of power amplifier.
In order to solve the above technical problems, embodiment of the present utility model provides a kind of inductive load detection circuit, should
For power amplification circuit, including triggers circuit, waveform generating circuit and comparator；In triggers circuit and power amplification circuit
The drain electrode connection of first power switch pipe, and the triggers circuit is connected with the input of the waveform generating circuit, is controlled for triggering
Make the wave period of waveform generating circuit generation；The output end electricity of the first input end of the comparator and the waveform generating circuit
Connection, the second input input predeterminated voltage of the comparator, the output end output inductive load testing result of the comparator；Its
In, the predeterminated voltage is the threshold voltage of the inductive load.
It is of the present utility model that embodiment further provides a kind of reactance skew compensation mechanism, including the inspection of above-mentioned inductive load
Slowdown monitoring circuit and tuning circuit；The output end of inductive load detection circuit is connected with the control terminal of the tuning circuit；Tuning electricity
The Signal Regulation electric capacity that road inputs according to the control terminal.
It is of the present utility model that embodiment further provides a kind of wireless charging power emitting unit, including above-mentioned reactance are inclined
Move compensation device.
It is of the present utility model that embodiment further provides a kind of wireless charging system, including above-mentioned wireless charging power hair
Penetrate unit.
The utility model embodiment is in terms of existing technologies, there is provided inductive load detection circuit, will triggering electricity
Road is connected with the drain electrode of the first power switch pipe in power amplification circuit, because the drain voltage waveform of power switch pipe changes
To load change it is related, to inductive load change sensitivity, therefore, using waveform generating circuit generate, in power amplification circuit
Power switch pipe drain voltage waveform, inductive load is detected, detection speed is fast and accurate, simultaneously as drain electrode
Voltage waveform and inductive load change are single, inductive load are detected reliable.The input of triggers circuit and waveform generating circuit
Connection so that triggers circuit can control the cycle of waveform generating circuit generation waveform, improve the detection of load detecting circuit
The flexibility of load.By comparator, the result that inductive load detects can be quickly exported.The inductive load testing result is used for
Regulation of the tuning circuit to capacitance is controlled, so that the efficiency of wireless charging system can be optimized according to testing result, it is ensured that work(
The safety of rate amplifying circuit.
In addition, triggers circuit includes：Second power switch pipe and at least one resistance；The drain electrode of second power switch pipe with
The resistance connects, the source ground of second power switch pipe, the grid input switch signal of second power switch pipe.Pass through
Using the second power switch pipe so that switching signal can flexibly control the conducting and cut-off of the second power switch pipe, meanwhile, increase
Power-up resistance, share the voltage of the second power switch pipe, it is ensured that the security of the second power switch pipe.
In addition, waveform generating circuit includes：Integrating circuit and rectification circuit；The output end of integrating circuit and the rectification circuit
Input connection；The input of integrating circuit is connected with the triggers circuit；The output end of the rectification circuit and the comparator
First input end electrically connects.Drained the voltage integrating meter exported by integrating circuit to the first power switch pipe, and passes through rectified current
Road carries out rectification output direct current signal to the result after integration, obtains the first power switch pipe drain voltage waveform, so that
The drain voltage waveform can characterize the imaginary impedance of input impedance.
In addition, integrating circuit uses resistance and capacitor seriesing circuit.
In addition, input voltage of the predeterminated voltage based on power amplification circuit obtains.By being obtained based on power amplification circuit
Predeterminated voltage, it is not necessary to increase extra power-supply device.
In addition, the first input end magnitude of voltage of comparator is higher than the second input terminal voltage value of the comparator, then output end
The inductive load testing result of output is partially perceptual for load.By comparator, the knot that inductive load detects can be quickly obtained
Fruit.
Brief description of the drawings
Fig. 1 is the wireless charging system block diagram according to prior art；
Fig. 2 is according to the putting position figure of power emitting unit and power receiving unit in the prior art；
Fig. 3 is the safe input impedance Zin scope schematic diagrames according to an E class A amplifier A of the prior art；
Fig. 4 is the circuit diagram according to the load detecting of prior art；
Fig. 5 is to detect circuit diagram according to the inductive load of the utility model first embodiment；
Fig. 6 is according to the integrated signal schematic diagram after rectification in the utility model first embodiment；
Fig. 7 is illustrated according to the first power switch pipe drain voltage waveform in ideal in the utility model first embodiment
Figure；
Fig. 8 is according to the first power switch pipe drain voltage ripple when inclined capacitive is loaded in the utility model first embodiment
Shape schematic diagram；
Fig. 9 is according to the first power switch pipe drain voltage ripple when loading partially perceptual in the utility model first embodiment
Shape schematic diagram；
Figure 10 is according to switching signal V2 or switching signal V3 waveform diagram in the utility model first embodiment；
Figure 11 is the inductive load detection circuit diagram in the utility model second embodiment；
Figure 12 is the reactance skew compensation mechanism structural representation in the embodiment of the utility model the 3rd；
Figure 13 is the circuit diagram of the tuning circuit in the embodiment of the utility model the 3rd.
Embodiment
It is new to this practicality below in conjunction with accompanying drawing to make the purpose of this utility model, technical scheme and advantage clearer
Each embodiment of type is explained in detail.It is however, it will be understood by those skilled in the art that each in the utility model
In embodiment, in order that reader more fully understands the application and proposes many ins and outs.But even if without these skills
Art details and many variations based on following embodiment and modification, it can also realize that each claim of the application is required and protect
The technical scheme of shield.
First embodiment of the present utility model is related to a kind of inductive load detection circuit.Inductive load detection circuit should
In power amplification circuit for wireless charging system transmitter unit, for example, D classes power amplification circuit, E classes power amplification electricity
Road, F class power amplification circuits.Present embodiment illustrates by taking E class power amplification circuits as an example.Inductive load detection electricity
Road, including：Triggers circuit 501, waveform generating circuit 502 and comparator 503, specific connection are as shown in Figure 5.
Triggers circuit 501 is connected with the drain electrode of the first power switch pipe 4011 in power amplification circuit, and triggers circuit
501 are connected with the input of waveform generating circuit 502, and the cycle of the waveform generating circuit 502 generation waveform is controlled for triggering.
Specifically, perception change of the power switch pipe to waveform is sensitive, therefore, triggers circuit in present embodiment with
Illustrated exemplified by power switch pipe, triggers circuit 501 includes：Second power switch pipe 5011, the second power switch pipe 5011
Drain electrode and the drain electrode of the first power switch pipe 4011 of power amplification circuit connect, the source electrode of the second power switch pipe 5011 connects
Ground, the grid input switch signal of second power switch pipe 5011.
Waveform generating circuit 502 includes：Integrating circuit 5021 and rectification circuit 5022.Wherein, integrating circuit 5021 uses
Resistance R1With electric capacity C1Series circuit.It is in series with a resistor because electric capacity has the characteristic of electric discharge and charging, realize to input waveform
Adjustment conversion, export the integral result to input voltage, the first work(obtained to integral result rectification by rectification circuit 5022
The drain voltage waveform of rate switching tube.Rectification circuit 5022 is roughly the same with the rectification circuit of prior art, in present embodiment
In will not be described in great detail.Resistance R in integrating circuit 50211The first connection end and triggers circuit 501 in the second power switch
The drain electrode connection of pipe 5011, R1Second connection end be connected with the input of rectification circuit 5022.R1Second connection end simultaneously with
Electric capacity C1The first connection end connection, C1Second connection end ground connection.By waveform generating circuit 502, establish the first power and open
Close the drain voltage waveform of pipe 4011 and input impedance Zin imaginary impedance jX direct relation.Fig. 6 is to pass through the integration after rectification
Signal, it will be appreciated from fig. 6 that perceptual region becomes big as the change of inductive load is big, the integrated signal in capacitive region is zero.
It is noted that as shown in figure 5, Vpa is the DC input voitage of power amplification circuit, V3 is that the second power is opened
Close the switching voltage of pipe 5011.The preferable operating point of first power switch pipe is in zero-point voltage switch and zero point differential switch shape
It is 50% dutycycle under state, preferable first power switch pipe drain voltage (Vdrain) waveform is as shown in fig. 7, wherein, separately
One waveform is the switching signal V2 of the first power switch pipe；Vdrain can be expressed as formula (4)：
The Vdrain oscillograms of the inclined capacitives of input impedance Zin are as shown in figure 8, the Vdrain oscillograms of input impedance perception partially
As shown in Figure 9.Integral areas of the Vdrain in shadow region becomes as inductive load becomes big it can be seen from Fig. 5 to Fig. 9
Greatly, the integral area of the first power switch pipe drain voltage is zero under capacitive load and desired load.Therefore, by controlling shade
The time interval in region so that Vdrain integration is directly proportional to inductance value.Wherein, what the first power switch tube grid inputted opens
OFF signal V2 is identical with the waveform for the switching signal V3 that the second power switch tube grid inputs, as shown in Figure 10.
The first input end of comparator 503 electrically connects with the output end of waveform generating circuit 502, and the second of comparator 501
Input inputs predeterminated voltage, the output end output inductive load testing result of comparator 503.Wherein, predeterminated voltage is perception
The threshold voltage of load.
Specifically, as shown in figure 5, Vpa is the DC input voitage of power amplification circuit, implementation can be set as needed
Fixed threshold voltage of the suitable reference voltage as inductive load.For example, can be according to the reference voltage of calculating, by Vpa
After concatenate bleeder circuit, by obtaining predeterminated voltage after partial pressure, such as predeterminated voltage Vref parts in Fig. 5.Predeterminated voltage Vref and
Signal after rectification represents whether load alreadys exceed sense by comparator 503, the output end output voltage Vind of comparator 503
Property load threshold value, if exceeding threshold value, inductive load testing result for load partially perception.For example, output voltage Vind
For high level when, represent that load alreadys exceed the threshold value of inductive load, inductive load testing result is partially perceptual for load；Or
Person, when output voltage Vind is low level, represent that load alreadys exceed the threshold value of inductive load, inductive load testing result is
Load is partially perceptual.
In present embodiment, when the drain voltage waveform of the first power switch pipe is changed into perception, triggers circuit 501 will be by
Triggering, Simultaneous Switching signal V3 (referring to V3 signals in Fig. 5) are controlled in the integrating circuit 5021 in waveform generating circuit 502
Integration period, so that the integration of the drain voltage of the first power switch pipe is directly proportional to load inductance amount, and this is integrated
Signal afterwards passes through the rectification of rectification circuit 5022, the integrated signal stablized.By the integrated signal and predeterminated voltage after rectification
Vref is compared by comparator, the signal acquisition inductive load testing result exported by the output end of comparator.
In terms of existing technologies, the inductive load detection circuit that present embodiment provides, utilizes power amplification circuit
In power switch pipe drain voltage waveform with load change relation, the first power switch is established by switching signal
Pipe drain voltage waveform and imaginary impedance jX direct relation, realize quick, the reliable detection to inductive load.Pass through
Two power switch pipes, the cycle of control waveform generating circuit generation waveform can be quickly triggered, accelerate the speed of inductive load, together
When, realize the first power switch pipe drain voltage waveform relation directly proportional to imaginary impedance jX so that the inspection of inductive load
Survey relatively reliable, ensure that the security of power amplification circuit.
Second embodiment of the present utility model is related to a kind of inductive load detection circuit.Second embodiment is first real
The further improvement of mode is applied, is mainly theed improvement is that：In the utility model second embodiment, triggers circuit 502 is wrapped
Include the second power switch pipe and at least one resistance.Physical circuit is as shown in figure 11.Resistance is according to actual need in present embodiment
It is configured, can is one, two and two or more, triggers circuit in present embodiment, with second power switch
Illustrated exemplified by pipe and a resistance.
Specifically, the drain electrode of the second power switch pipe 5011 is connected with one end of resistance 5012, meanwhile, to drain electrode and product
R in parallel circuit 50211Connection；The other end of resistance 5012 is connected with the drain electrode of the first power switch pipe 4011, the second power
The grid input switch signal of switching tube 5011, source ground.Now, the second power switch pipe 5011 is to connect with resistance 5012
Structure, by increasing resistance, realize the partial pressure to the second power switch pipe 5011.
The inductive load detection circuit that present embodiment provides, increases at least one resistance, so as to real in triggers circuit
Now to the partial pressure of the second power switch pipe, it is ensured that security of second power switch pipe when inductive load quickly changes, keep away
The damage of the second power switch pipe is exempted from.
The embodiment of the utility model the 3rd is related to a kind of reactance skew compensation mechanism, and the device is applied to power amplification electricity
Lu Zhong, as shown in figure 12, including：Inductive load detects circuit 1201 and tuning circuit 1202.
In one specific embodiment, the output end of inductive load detection circuit 1202 and the control of tuning circuit 1202
End connection.
Specifically, inductive load detection circuit 1201 is using the perception detection electricity in above-mentioned first or second embodiment
Road, the structure of tuning circuit 1202 is as shown in figure 13, and tuning circuit is concatenated with electric capacity parallel-connection structure by multigroup switch and formed, and is passed through
Capacitance in control signal control tuning circuit 1102.
The Signal Regulation electric capacity that tuning circuit 1202 inputs according to control terminal.
Specifically, control of the result of the output end output of inductive load detection circuit 1201 as tuning circuit 1202
Signal.High level or the low level that circuit 1201 exports are detected by inductive load, control in tuning circuit 1202 and electric capacity
The opening and closing of switch in parallel, wherein, control signal can control at least one set of electric capacity and opening in switch in parallel structure
Close.Can be the control terminal input high level of tuning circuit 1202 in implementation, control tuning circuit increase electric capacity or tune
The humorous control terminal input low level of circuit 1202, control tuning circuit increase electric capacity, control level not limited in present embodiment
System.For example, inductive load detection circuit 1202 exports high level, then tuning circuit 1202 is as shown in figure 13, according to the high level
Control the opening of sw1 at least one switches into sw4.
In terms of existing technologies, the reactance skew compensation mechanism provided in present embodiment, inductive load is detected
The control terminal of circuit output end and tuning circuit connects, and controls tuning circuit to adjust electric capacity by the testing result of inductive load
Value, so as to ensure that load change is in limited range in power amplification circuit, it is ensured that the safety of power amplification circuit.Together
When, the detection speed of inductive load detection circuit is fast, without can determine that testing result by microcontroller, therefore, passes through sense
Control signal of the output result of property load detecting circuit as tuning circuit, improves response speed, ensures that power
The security of amplifying circuit.
The embodiment of the utility model the 4th is related to a kind of reactance skew compensation mechanism.4th embodiment is the 3rd implementation
The further improvement of mode, is mainly theed improvement is that：If the input signal of tuning circuit control terminal is the partially perceptual letter of load
Number, then control the tuning circuit to increase capacitance.
Specifically, in power amplification circuit, when load change is partially perceptual, in order to which proof load changes in limited range
It is interior, by controlling tuning circuit to increase the capacitance in tuning circuit.Therefore, the input signal of tuning circuit control terminal is
The partially perceptual signal of load, then control tuning circuit increase capacitance.
The reactance skew compensation mechanism that present embodiment provides, when loading partially perceptual in power amplification circuit, passes through control
Tuning circuit processed increases capacitance, ensures that and change in limited range is supported in power amplification circuit.
The embodiment of the utility model the 5th is related to a kind of wireless charging power emitting unit.Wireless charging power emission list
Member, including：Reactance skew compensation mechanism in 3rd or the 4th embodiment.Power amplification circuit is not limited in present embodiment
Type, present embodiment illustrates by taking E class power amplification circuits as an example.
Tuning circuit in reactance skew compensation mechanism is included in matching network, can by reactance skew compensation mechanism
The capacitance in tuning circuit is adjusted with quick detection inductive load and according to testing result.
In terms of existing technologies, the wireless charging transmitter unit that this embodiment party provides, is filled by reactance migration
Put, when loading partially perceptual, adjust the capacitance of tuning circuit so that load change is in limited range, it is ensured that wireless charging
The efficiency of electric transmitter unit will not decline, while protect the safety of the power amplification circuit of wireless charging transmitter unit.
The embodiment of the utility model the 6th is related to the wireless charging in a kind of wireless charging system, including the 5th embodiment
Transmitter unit.
Specifically, wireless charging system includes, power emitting unit and power receiving unit, the work(in present embodiment
Rate transmitter unit is the wireless charging power emitting unit in the 5th embodiment, power receiving unit and work(of the prior art
Rate receiving unit is roughly the same, is repeated no more in present embodiment.
In terms of existing technologies, the wireless charging system that present embodiment provides, it is excellent by the power emitting unit
Whole wireless charging system is changed.
It will be understood by those skilled in the art that the respective embodiments described above are to realize specific implementation of the present utility model
Example, and in actual applications, can to it, various changes can be made in the form and details, without departing from spirit of the present utility model
And scope.
Claims (10)
1. a kind of inductive load detects circuit, it is characterised in that is given birth to applied to power amplification circuit, including triggers circuit, waveform
Into circuit and comparator；
The triggers circuit is connected with the drain electrode of the first power switch pipe in the power amplification circuit, and the triggers circuit
It is connected with the input of the waveform generating circuit, the wave period of the waveform generating circuit generation is controlled for triggering；
The first input end of the comparator electrically connects with the output end of the waveform generating circuit, and the second of the comparator is defeated
Enter end input predeterminated voltage, the output end output inductive load testing result of the comparator；
Wherein, the predeterminated voltage is the threshold voltage of the inductive load.
2. circuit is detected according to the inductive load described in claim 1, it is characterised in that the triggers circuit includes：Second
Power switch pipe and at least one resistance；
The drain electrode of second power switch pipe is connected with the resistance, the source ground of second power switch pipe, described
The grid input switch signal of second power switch pipe.
3. inductive load according to any one of claim 1 to 2 detects circuit, it is characterised in that the waveform generation
Circuit includes：Integrating circuit and rectification circuit；
The output end of the integrating circuit is connected with the input of the rectification circuit；
The input of the integrating circuit is connected with the triggers circuit；
The output end of the rectification circuit electrically connects with the first input end of the comparator.
4. circuit is detected according to the inductive load described in claim 3, it is characterised in that the integrating circuit using resistance with
Electric capacity serial or parallel connection circuit.
5. circuit is detected according to the inductive load described in claim 4, it is characterised in that the predeterminated voltage is based on the work(
The input voltage of rate amplifying circuit obtains.
6. circuit is detected according to the inductive load described in claim 1, it is characterised in that the first input end of the comparator
Magnitude of voltage is higher than the second input terminal voltage value of the comparator, then the inductive load testing result of output end output is inclined for load
Perception.
7. a kind of reactance skew compensation mechanism, it is characterised in that including the inductive load inspection described in any one of claim 1 to 6
Slowdown monitoring circuit and tuning circuit；
The output end of the inductive load detection circuit is connected with the control terminal of the tuning circuit；
The Signal Regulation electric capacity that the tuning circuit inputs according to the control terminal.
8. according to the reactance skew compensation mechanism described in claim 7, it is characterised in that if the tuning circuit control terminal
Input signal is the partially perceptual signal of load, then controls the tuning circuit increase capacitance.
9. a kind of wireless charging power emitting unit, it is characterised in that inclined including the reactance described in any one of claim 7 to 8
Move compensation device.
10. a kind of wireless charging system, it is characterised in that including the wireless charging power emitting unit described in claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720420082.4U CN206894366U (en) | 2017-04-20 | 2017-04-20 | Inductive load detection circuit, reactance compensation device, power emitting unit and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720420082.4U CN206894366U (en) | 2017-04-20 | 2017-04-20 | Inductive load detection circuit, reactance compensation device, power emitting unit and system |
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| Publication Number | Publication Date |
|---|---|
| CN206894366U true CN206894366U (en) | 2018-01-16 |
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ID=61324414
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720420082.4U Expired - Fee Related CN206894366U (en) | 2017-04-20 | 2017-04-20 | Inductive load detection circuit, reactance compensation device, power emitting unit and system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110556925A (en) * | 2018-05-31 | 2019-12-10 | 华为技术有限公司 | wireless charger and control method |
-
2017
- 2017-04-20 CN CN201720420082.4U patent/CN206894366U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110556925A (en) * | 2018-05-31 | 2019-12-10 | 华为技术有限公司 | wireless charger and control method |
| CN110556925B (en) * | 2018-05-31 | 2022-12-27 | 华为技术有限公司 | Wireless charger and control method |
| US11569688B2 (en) | 2018-05-31 | 2023-01-31 | Huawei Technologies Co., Ltd. | Wireless charger and control method |
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Granted publication date: 20180116 Termination date: 20180420 |