CN106300520A - The overvoltage crowbar of wireless charging receiving terminal and over-voltage protection method - Google Patents
The overvoltage crowbar of wireless charging receiving terminal and over-voltage protection method Download PDFInfo
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Abstract
The invention discloses overvoltage crowbar and the over-voltage protection method of a kind of wireless charging receiving terminal, including receiving the energy of transmitting coil transmission with resonance manner and being converted into the receiving coil of alternating voltage, connect described receiving coil and for regulating the resonant matching network of the frequency of described receiving coil, described alternating voltage being carried out rectifying conversion to generate rectification circuit and the testing circuit of DC charging voltage；Described testing circuit detects the amplitude of described DC charging voltage, and compares with the secure threshold set；If the amplitude of charging voltage exceedes the secure threshold of setting; then control described resonant matching network and adjust the operating frequency of described receiving coil; receiving coil is made to be in non-resonant condition at the operating frequency point of transmitting coil; and then the voltage making receiving coil receive reduces, then reach the purpose of design of receiving terminal overvoltage protection.The present invention designs simply, reliable operation, greatly improves the safety of power device charging.
Description
Technical field
The invention belongs to wireless charging technical field, specifically, relate to a kind of in wireless charging system
Receiving terminal carries out circuit design and the implementation method of overvoltage protection.
Background technology
Wireless charging technology comes from wireless power transmission technology, and low power wireless charging technology is frequently with electromagnetic induction
Formula, powerful wireless charging technology then uses resonant mode, power supply unit (charger) transmit its energy to power device.
Power device uses the energy received to charge the battery of its inside, and is used for himself running simultaneously.Due to charger
And transmitting energy with magnetic field between power device, connect without electric wire between the two, therefore, charger and power device can
Accomplishing to expose without conductive junction point, safety is high, and charging operations is convenient flexibly, at current mobile phone, TV, electric automobile etc.
Field has obtained increasingly being widely applied.
In the electronic product designed based on resonance type wireless charging technique, charger end is provided with transmitting coil,
Receiving terminal (that is, power device) is provided with receiving coil, when transmitting coil and receiving coil are adjusted to same frequency, in other words
When transmitting coil and receiving coil resonate in a specific frequency, the most just can exchange energy each other.In reality
During border uses, when the voltage of transmitting coil is relatively big or transmitting coil causes the voltage of transmitting terminal higher because of operation irregularity
Time, receiving coil will receive bigger voltage.When receiving the secure threshold that voltage exceedes load circuit in power device,
May result in the load circuit excessive pressure damages in power device, then affect the service life of power device.
In order to receiving terminal carries out overvoltage protection, existing solution is installation over-voltage protector in receiving terminal,
Such as electric fuse, varistor, stabilivolt etc., to play certain overvoltage protection, burning voltage, minimizing damage etc. in circuit
Effect.But, this over-voltage protection method is all to protect device consumed energy to realize, and after long-term work, protection device can
Can be able to lose efficacy, therefore protective effect is very limited.
Summary of the invention
It is an object of the invention to provide a kind of brand-new over-voltage protection technology for wireless charging receiving terminal, receiving
During the electric voltage exception that termination receives, the resonant frequency of regulation receiving coil is used to reduce reception with the mode of transmitting coil mismatch
The voltage of coil, reaches the purpose of overvoltage protection then.
For solving above-mentioned technical problem, the present invention is achieved by the following technical solutions:
The present invention proposes the over-voltage protection method of a kind of wireless charging receiving terminal in one aspect, including: at described wireless charging
Electricity receiving terminal, its receiving coil receives, with resonance manner, the energy that transmitting coil transmits, and is converted into alternating voltage；To described friendship
Stream voltage carries out rectifying conversion, to generate DC charging voltage；Detect the amplitude of described DC charging voltage, and with the peace set
Full threshold value compares；If the amplitude of charging voltage exceedes secure threshold, then adjust the frequency of receiving coil, make receiving coil exist
It is in non-resonant condition, so that the voltage that receiving coil receives reduces at the operating frequency point of transmitting coil.
In order to the working frequency points of described receiving coil is regulated neatly, can set at described wireless charging receiving terminal
Put resonant matching network, the receiving coil described in connection, the frequency of receiving coil is adjusted by resonant matching network；Described humorous
Shake and matching network arranges the idle capacity of alternative access, before described idle capacity access network, adjust described reception
Coil is in resonant condition at the operating frequency point of transmitting coil；Described safety threshold is exceeded in amplitude charging voltage being detected
During value, by described idle capacity access network, make the operating frequency point of the Frequency point deviation transmitting coil of described receiving coil, continue
And reduce the purpose of described charging voltage.
Preferably, described idle capacity is at least provided with one；Reception line described in one end of described idle capacity is connected
Circle, the other end passes through switch element ground connection, or by after described idle capacity and switch elements in series, and in resonant matching network
Matching capacitance be in parallel；Then by changing the on off operating mode of described switch element, to control described idle capacity selectivity
Ground accesses described resonant matching network.
The present invention proposes the overvoltage crowbar of a kind of wireless charging receiving terminal on the other hand, including with resonance manner
Receive the energy of transmitting coil transmission and be converted into the receiving coil of alternating voltage, connect described receiving coil and for regulating
State the resonant matching network of the frequency of receiving coil, described alternating voltage carried out rectifying conversion to generate DC charging voltage
Rectification circuit and testing circuit；Described testing circuit detect described DC charging voltage amplitude, and with set safety threshold
Value compares；If the amplitude of charging voltage exceedes the secure threshold of setting, then control described resonant matching network and adjust described
The operating frequency of receiving coil, makes receiving coil be in non-resonant condition at the operating frequency point of transmitting coil, and then makes to connect
The voltage that take-up circle receives reduces.
For the ease of regulating the frequency of receiving coil, described resonant matching network is provided with the standby of alternative access
With electric capacity, described testing circuit is when the amplitude described charging voltage being detected exceedes the secure threshold of setting, by controlling institute
State idle capacity and access described resonant matching network, to change the frequency of described receiving coil so that it is deviate described transmitting coil
Operating frequency point, then reduce described charging voltage, reach the purpose of overvoltage protection.
A kind of preferred implementation of resonant matching network, described idle capacity is accessed as described idle capacity selectivity
At least provided with one, the receiving coil described in the connection of one end, the other end passes through switch element ground connection；Described testing circuit is in inspection
When measuring described charging voltage not less than secure threshold, control described switch element and disconnect, the idle capacity described in isolation；In inspection
Measure described charging voltage when exceeding secure threshold, control described switching elements conductive, make described idle capacity ground connection, by described
Idle capacity accesses described resonant matching network.
Preferably, described resonant matching network is provided with multiple matching capacitance, regulates the electric capacity of described matching capacitance
Value, is in resonant condition at the operating frequency point of transmitting coil adjusting described receiving coil；Described idle capacity is provided with two
Individual, one end of first idle capacity connects one end of described receiving coil, and the other end of receiving coil is by described coupling
Electric capacity connects one end of second idle capacity, and the other end of two idle capacities is connect by the switch ways of described switch element
Ground, the testing circuit described in control end connection of described switch element.
Another preferred implementation of resonant matching network is accessed, described humorous as described idle capacity selectivity
Shake and matching network is provided with multiple matching capacitance, regulate the capacitance of described matching capacitance, exist adjusting described receiving coil
The operating frequency point of transmitting coil is in resonant condition；Described idle capacity at least provided with one, described idle capacity with open
After closing the switch ways series connection of element, it is connected in parallel on the two ends of one or more described matching capacitance, described switch element
Control end connect described in testing circuit, by control described switch element break-make, to control described idle capacity selectivity
Ground accesses resonant matching network.
Further, described testing circuit is provided with voltage sampling circuit and comparator, described voltage sampling circuit
Described DC charging voltage is sampled, and forms sampled voltage；Described comparator receive described sampled voltage, and with reference
Voltage compares, and when described sampled voltage is more than described reference voltage, output effectively controls signal to resonance pair net
Network, to regulate the frequency of described receiving coil, makes described receiving coil be in disresonance at the operating frequency point of transmitting coil
State；Wherein, described reference voltage determines according to described secure threshold.
Preferably, described reference voltage is preferably generated by linear voltage regulator conversion by described DC charging voltage, transmission
To the inverting input of described comparator, the sampled voltage described in in-phase input end reception of described comparator, export high level
Effectively control signal to described resonant matching network.
Compared with prior art, advantages of the present invention and good effect are: the present invention is based on resonance type wireless charging technique
Design receiving terminal overvoltage crowbar, use when the overtension that receiving terminal receives adjust receiving coil resonance point with
The mode of the operating frequency point mismatch of transmitting coil, makes the voltage of receiving coil reduce, has then reached receiving terminal overvoltage
The purpose of design of protection.Use this overvoltage protection mode, at receiving terminal without arranging special over-voltage protector, on the one hand
Can solve because setting up the energy loss problem that over-voltage protector is brought, on the other hand can solve over-voltage protector because of
Life-time service and the problems such as disabler easily occur, then significantly improve the overvoltage protection effect of receiving terminal, contribute to extend
The service life of power device.
After reading in conjunction with the accompanying the detailed description of embodiment of the present invention, the other features and advantages of the invention will become more
Add clear.
Accompanying drawing explanation
Fig. 1 is the flow chart of a kind of embodiment of the over-voltage protection method of wireless charging receiving terminal proposed by the invention；
Fig. 2 is the circuit theory frame of a kind of embodiment of the overvoltage crowbar of wireless charging receiving terminal proposed by the invention
Figure；
Fig. 3 is the circuit theory diagrams of a kind of embodiment of the overvoltage crowbar shown in Fig. 2；
Fig. 4 is the circuit theory diagrams of another embodiment of the overvoltage crowbar shown in Fig. 2.
Detailed description of the invention
Below in conjunction with the accompanying drawings the detailed description of the invention of the present invention is described in more detail.
The present embodiment proposes a kind of over-voltage protection method based on resonance type wireless charging technique, applies in wireless charging system
The receiving terminal of system, when the overtension of receiving coil, can adjust the Frequency point deviation transmitting coil of receiving coil automatically
Working frequency points, enters mismatch Conditions by controlling receiving coil, so that the voltage of receiving coil reduces, then reaches overvoltage
The purpose of design of protection.
Its concrete methods of realizing is: combine shown in Fig. 1, first, according to different power devices, charging voltage is born energy
Power, presets secure threshold.According to the secure threshold set, the reasonably work frequency of the transmitting coil in adjustment charger
Rate, to meet charging requirement.Secondly, at wireless charging receiving terminal, the Frequency point of its receiving coil is regulated so that it is at transmitting coil
Operating frequency point at enter resonant condition.Owing to receiving coil impedance at present frequency point is minimum, therefore energy conversion
Efficiency is the highest, the magnetic field energy that transmitting coil is launched can be realized high efficiency reception and conversion.Just working at transmitting coil
Chang Shi, after being processed by the rectified filtering of voltage that receiving coil receives etc., is generated amplitude and fills less than the direct current of secure threshold
Piezoelectric voltage.On the one hand utilize described DC charging voltage can be the battery charging in power device, on the other hand can be direct
The load circuit being supplied in power device, meets need for electricity when it runs.When the input voltage of transmitting coil is relatively big or
Person's transmitting coil because of operation irregularity cause transmitting terminal voltage higher time, the charging voltage received by receiving coil will be risen therewith
Height, may cause the excessive pressure damages of load circuit then beyond the secure threshold set.Protect to receiving terminal be realized overvoltage
Protecting, the present embodiment, when the amplitude described DC charging voltage being detected exceedes the secure threshold of setting, changes receiving coil
Frequency, is adjusted to mismatch Conditions by the most matched receiving coil, i.e. allows receiving coil at the operating frequency point of transmitting coil
It is in non-resonant condition, so that the voltage of receiving coil reduces, reaches the purpose of overvoltage protection.
In order to realize adjusting neatly to the frequency of receiving coil, resonance pair net can be set at wireless charging receiving terminal
Network, the receiving coil described in connection, by the parameter value of the matching capacitance in regulation resonant matching network, to adjust receiving coil
Resonant condition is entered at the operating frequency point of transmitting coil.When the overtension of receiving terminal, in order to make the frequency of receiving coil
Point offsets, and enters non-resonant condition, and the present embodiment sets up the standby electricity optionally accessed in resonant matching network
Hold, be linked in resonant matching network when receiving-end voltage exceedes secure threshold by controlling idle capacity, so that receiving
The frequency departure resonance point of coil, enters mismatch Conditions.Now, the return loss of receiving coil increases, and impedance increases, and then makes
Must be reduced by the charging voltage that receiving coil receives, play the effect of overvoltage protection.
Based on above-mentioned design philosophy, the present embodiment devises a set of overvoltage crowbar at wireless charging receiving terminal, such as Fig. 2
Shown in, the key component such as including resonant matching network, rectification circuit, testing circuit, switch element, idle capacity.Wherein,
Resonant matching network connects the receiving coil of wireless charging receiving terminal, for being adjusted the frequency of receiving coil.Regulate humorous
The capacitance of the matching capacitance shaken in matching network, makes receiving coil and resonant matching network at the operating frequency point of transmitting coil
There is series resonance in place, then receives, with resonance manner, the energy that transmitting coil transmits, and change generation alternating voltage.Utilize whole
Current circuit carries out rectifying conversion, to form DC charging voltage, for power device to the alternating voltage of receiving coil conversion output
In load circuit power, and be in power device battery charging.Utilize the testing circuit width to described DC charging voltage
Value carries out sample detecting, and compares with secure threshold set in advance, if the amplitude of DC charging voltage is not less than safety
Threshold value, then it represents that the voltage that receiving coil receives is normal, controls switch element and keeps the off-state of acquiescence.By idle capacity
It is connected to described switch element, when switch element disconnects, controls described idle capacity and isolate with resonant matching network, keep connecing
The resonant condition of take-up circle.When testing circuit detects the secure threshold that the amplitude of charging voltage exceedes setting, represent and receive
The overtension that coil receives, needs to perform overvoltage protection operation.Now, testing circuit output control signal, control described
Switch element closes, and idle capacity is accessed resonant matching network, then changes the Frequency point of receiving coil so that it is off-resonance
Point.Now, the return loss of receiving coil increases, i.e. receiving coil is in disresonance shape at the operating frequency point of transmitting coil
State, impedance increases, and the voltage that receiving coil receives reduces, thus plays the effect of the load circuit in protection power device.
Below in conjunction with Fig. 3, Fig. 4, particular circuit configurations and operation principle thereof to the overvoltage crowbar of the present embodiment are entered
The elaboration that row is detailed.
As it is shown on figure 3, in the present embodiment, described resonant matching network is provided with the matching capacitance of multi-channel parallel, example
Such as matching capacitance C3, C4, C5.After matching capacitance C3, C4, C5 parallel connection, it is in series with receiving coil L1, configures described coupling electricity
Hold the capacitance of C3, C4, C5, so that receiving coil L1 goes here and there at the operating frequency point of transmitting coil with resonant matching network
Connection resonance.Utilize receiving coil L1 to receive the energy that transmitting coil transmits, and be converted into AC voltages transmission to rectification circuit.Institute
State rectification circuit and the alternating voltage that receiving coil L1 generates is carried out rectifying conversion, generate DC voltage and carry out via filter circuit
After waveform shaping, export stable DC charging voltage Vin, transmit to load circuit or fill for the battery in power device
Electricity.Design voltage sample circuit and comparator U1 in testing circuit, utilize voltage sampling circuit to described DC charging voltage
Vin samples, and one of them input of generation sampled voltage Vo transmission to comparator U1 (such as, transmits to comparator U1
In-phase input end+), the another one input at comparator U1 connects reference voltage Vref (such as, anti-at comparator U1
Phase input-connection reference voltage Vref), described reference voltage Vref should determine according to the secure threshold set.As this reality
Execute a kind of preferred design of example, it is possible to use linear voltage regulator LDO carries out voltage stabilizing change to described DC charging voltage Vin
Change, to generate stable reference voltage Vref.The outfan of comparator U1 is connected to the control end of switch element K, utilizes ratio
The low and high level Signal-controlled switch element K break-make of relatively device U1 output, and then change idle capacity C1, C2 at resonant matching network
In access or isolation.In the present embodiment, described idle capacity C1, C2 can arrange a road, it is also possible to arrange multichannel,
Can use and one end of idle capacity C1 or C2 is connected receiving coil L1, the other end is connect by the switch ways of switch element K
The mode on ground, it is achieved the selectivity of idle capacity C1 or C2 accesses, as shown in Figure 3.It is of course also possible to use idle capacity C1
After connecting with the switch ways of switch element K, it is connected in parallel on the side at the two ends of a wherein road or multichannel matching capacitance C3, C4 or C5
Formula, realizes idle capacity C1 selectivity in resonant matching network and accesses, as shown in Figure 4.
Fig. 3 shows the circuit design mode arranging two-way idle capacity C1, C2, by the one of a wherein road idle capacity C2
End is connected to one end of described receiving coil L1, and the other end of receiving coil L1 passes through matching capacitance C3 of series connection with it, C4, C5
Parallel branch connect an other road idle capacity C1 one end, the other end of two-way idle capacity C1, C2 is connected to switch
The switch ways of element K, and by the switch ways ground connection of described switch element K.
When transmitting terminal is working properly, the alternating voltage being received and being generated by receiving coil L1 is via rectification circuit and filter
The amplitude of the DC charging voltage Vin that wave circuit rectifying and wave-filtering exports after processing is less than the secure threshold set, now by electricity
The sampled voltage Vo that pressure sample circuit collects, less than reference voltage Vref, comparator U1 output low level signal, controls switch
Element K keeps the off-state of acquiescence.Now, idle capacity C1, C2 do not access resonant matching network, and receiving coil L1 is operated in
Under resonant condition.
The input voltage received when transmitting coil is relatively big or transmitting coil causes transmitting terminal voltage relatively because of operation irregularity
Gao Shi, the alternating voltage being received by receiving coil L1 and being generated is defeated after processing via rectification circuit and filter circuit rectifying and wave-filtering
The amplitude of the DC charging voltage Vin gone out raises, and has exceeded the secure threshold set.Now, gathered by voltage sampling circuit
The sampled voltage Vo arrived is more than reference voltage Vref, and comparator U1 exports the effective control signal of high level, controls switch element K
Conducting, and then make the other end ground connection of idle capacity C1, C2.Now, idle capacity C1, C2 access resonant matching network, cause
The working frequency points of receiving coil L1 changes, and deviate from resonance point.Now, the return loss of receiving coil L1 increases, impedance
Raise, then make the voltage received by receiving coil L1 reduce, thus serve the effect of overvoltage protection.
Fig. 4 shows another circuit design being linked in resonant matching network by idle capacity C1 selectivity.That is,
After the switch ways of idle capacity C1 with switch element K is connected, the wherein road coupling electricity being connected in parallel in resonant matching network
Hold the two ends of C5.When charging voltage Vin is not less than the secure threshold set, comparator U1 output low level signal, control out
Close element K to remain off, make idle capacity C1 isolate resonant matching network.When transmitting terminal electric voltage exception, cause receiving terminal
Charging voltage Vin when exceeding the secure threshold of setting, then comparator U1 exports the effective control signal of high level, controls switch
Element K turns on, and idle capacity C1 is accessed resonant matching network, and is in parallel with matching capacitance C5, then change receiving coil
The working frequency points of L1, makes receiving coil L1 and transmitting coil mismatch, receiving coil L1 at the operating frequency point of transmitting coil not
Again being at resonant condition, thus impedance increases, the voltage received reduces, and has reached the purpose of overvoltage protection.
Certainly, described idle capacity can also be adopted and be selectively switched in other ways in resonant matching network, with reality
The now adjustment to the working frequency points of receiving coil L1.
In the present embodiment, described switch element K can select transistor, controllable silicon, field effect transistor etc. to have switch work
Electronic component, this is the most specifically limited by the present embodiment.
The over-voltage protection technology of the wireless charging receiving terminal of the present invention, the working frequency points deviation using regulation receiving coil is humorous
The mode shaken a little, to reduce receiving-end voltage, is compared tradition and is used the circuit design mode of over-voltage protector, and circuit works more
Add reliable, the forfeiture of function will not be caused because of the inefficacy of over-voltage protector, greatly improve the peace of power device charging
Quan Xing.
Certainly, described above is not limitation of the present invention, and the present invention is also not limited to the example above, and this technology is led
Change that the those of ordinary skill in territory is made in the essential scope of the present invention, retrofit, add or replace, also should belong to this
Bright protection domain.
Claims (10)
1. the over-voltage protection method of a wireless charging receiving terminal, it is characterised in that
At described wireless charging receiving terminal, its receiving coil receives, with resonance manner, the energy that transmitting coil transmits, and is converted into
Alternating voltage；
Described alternating voltage is carried out rectifying conversion, to generate DC charging voltage；
Detect the amplitude of described DC charging voltage, and compare with the secure threshold set；If the amplitude of charging voltage surpasses
Cross secure threshold, then adjust the frequency of receiving coil, make receiving coil be in disresonance at the operating frequency point of transmitting coil
State, so that the voltage that receiving coil receives reduces.
The over-voltage protection method of wireless charging receiving terminal the most according to claim 1, it is characterised in that
At described wireless charging receiving terminal, resonant matching network is set, the receiving coil described in connection, passes through resonant matching network
Adjust the frequency of receiving coil；
The idle capacity of alternative access is set in described resonant matching network, before described idle capacity access network,
Adjust described receiving coil and be in resonant condition at the operating frequency point of transmitting coil；Surpass in amplitude charging voltage being detected
When crossing described secure threshold, by described idle capacity access network, make the Frequency point deviation transmitting coil of described receiving coil
Operating frequency point, reduces described charging voltage then.
The over-voltage protection method of wireless charging receiving terminal the most according to claim 2, it is characterised in that described idle capacity
At least provided with one；Receiving coil described in one end of described idle capacity is connected, the other end passes through switch element ground connection, or
Person, by after described idle capacity and switch elements in series, is in parallel with the matching capacitance in resonant matching network；Then by changing
Become the on off operating mode of described switch element, be selectively accessing described resonant matching network controlling described idle capacity.
4. the overvoltage crowbar of a wireless charging receiving terminal, it is characterised in that including:
Receiving coil, receives, with resonance manner, the energy that transmitting coil transmits, and is converted into alternating voltage；
Resonant matching network, the receiving coil described in connection, for regulating the frequency of described receiving coil；
Rectification circuit, carries out rectifying conversion to described alternating voltage, to generate DC charging voltage；
Testing circuit, detects the amplitude of described DC charging voltage, and compares with the secure threshold set；If charging voltage
Amplitude exceed the secure threshold of setting, then control described resonant matching network and adjust the operating frequency of described receiving coil, make
Receiving coil is in non-resonant condition at the operating frequency point of transmitting coil, and then makes the voltage drop that receiving coil receives
Low.
The overvoltage crowbar of wireless charging receiving terminal the most according to claim 4, it is characterised in that at described resonance
Being provided with the idle capacity of alternative access in distribution network, described testing circuit surpasses in the amplitude described charging voltage being detected
When crossing the secure threshold set, access described resonant matching network, to regulate described reception line by controlling described idle capacity
Described in the frequency departure of circle, the operating frequency point of transmitting coil, reduces described charging voltage then.
The overvoltage crowbar of wireless charging receiving terminal the most according to claim 5, it is characterised in that described idle capacity
At least provided with one, the receiving coil described in the connection of one end, the other end passes through switch element ground connection；Described testing circuit is in inspection
When measuring described charging voltage not less than secure threshold, control described switch element and disconnect, the idle capacity described in isolation；In inspection
Measure described charging voltage when exceeding secure threshold, control described switching elements conductive, make described idle capacity ground connection, by described
Idle capacity accesses described resonant matching network.
The overvoltage crowbar of wireless charging receiving terminal the most according to claim 6, it is characterised in that at described resonance
Distribution network is provided with multiple matching capacitance, regulates the capacitance of described matching capacitance, to adjust described receiving coil in transmitting
It is in resonant condition at the operating frequency point of coil；
Described idle capacity is provided with two, and one end of first idle capacity connects one end of described receiving coil, receives line
The other end of circle connects one end of second idle capacity by described matching capacitance, and the other end of two idle capacities passes through
The switch ways ground connection of described switch element, the testing circuit described in control end connection of described switch element.
The overvoltage crowbar of wireless charging receiving terminal the most according to claim 5, it is characterised in that at described resonance
Distribution network is provided with multiple matching capacitance, regulates the capacitance of described matching capacitance, to adjust described receiving coil in transmitting
It is in resonant condition at the operating frequency point of coil；
Described idle capacity, at least provided with one, after described idle capacity is connected with the switch ways of switch element, is connected in parallel on
The two ends of one or more described matching capacitance, the testing circuit described in control end connection of described switch element is logical
Cross the on off operating mode changing described switch element, be selectively accessing resonant matching network controlling described idle capacity.
9. according to the overvoltage crowbar of the wireless charging receiving terminal according to any one of claim 4 to 8, it is characterised in that
Described testing circuit is provided with
Voltage sampling circuit, samples to described DC charging voltage, forms sampled voltage；
Comparator, receives described sampled voltage, and compares with reference voltage, when described sampled voltage more than described with reference to electricity
During pressure, output effectively controls signal to resonant matching network, to regulate the frequency of described receiving coil, makes described receiving coil
It is in non-resonant condition at the operating frequency point of transmitting coil；
Wherein, described reference voltage determines according to described secure threshold.
The overvoltage crowbar of wireless charging receiving terminal the most according to claim 9, it is characterised in that described with reference to electricity
Press and generated by linear voltage regulator conversion by described DC charging voltage, the inverting input of transmission to described comparator, described
The sampled voltage described in in-phase input end reception of comparator, output high level effectively controls signal to described resonance coupling
Network.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109546711A (en) * | 2018-12-28 | 2019-03-29 | 维沃移动通信有限公司 | Wireless charging control method, circuit and terminal device |
| CN114499593A (en) * | 2021-12-30 | 2022-05-13 | 上海矽力杰微电子技术有限公司 | Method for detecting wireless charging communication envelope |
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| US11996700B2 (en) | 2018-12-28 | 2024-05-28 | Vivo Mobile Communication Co., Ltd. | Wireless charging control method, circuit and terminal device |
| CN114499593A (en) * | 2021-12-30 | 2022-05-13 | 上海矽力杰微电子技术有限公司 | Method for detecting wireless charging communication envelope |
| CN114499593B (en) * | 2021-12-30 | 2023-07-21 | 上海矽力杰微电子技术有限公司 | Detection method of wireless charging communication envelope |
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Application publication date: 20170104 |