CN110518706A - A kind of wireless charging device and its protection circuit - Google Patents
A kind of wireless charging device and its protection circuit Download PDFInfo
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- CN110518706A CN110518706A CN201910733303.7A CN201910733303A CN110518706A CN 110518706 A CN110518706 A CN 110518706A CN 201910733303 A CN201910733303 A CN 201910733303A CN 110518706 A CN110518706 A CN 110518706A
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- 238000001514 detection method Methods 0.000 claims abstract description 14
- 238000004891 communication Methods 0.000 claims abstract description 10
- 238000006243 chemical reaction Methods 0.000 claims description 7
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- 238000005516 engineering process Methods 0.000 abstract description 2
- 230000005611 electricity Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000005674 electromagnetic induction Effects 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
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- 239000000796 flavoring agent Substances 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/10—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by the energy transfer between the charging station and the vehicle
- B60L53/12—Inductive energy transfer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/60—Monitoring or controlling charging stations
- B60L53/62—Monitoring or controlling charging stations in response to charging parameters, e.g. current, voltage or electrical charge
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/80—Circuit arrangements or systems for wireless supply or distribution of electric power involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/12—Electric charging stations
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The present invention relates to electronic technology fields; provide a kind of wireless charging device and its protection circuit; wireless charging device includes wireless power transmitting terminal and wireless power receiving end; wireless power transmitting terminal includes the first control module and power supply module; wireless power receiving end includes the second control module and receiving module; the voltage output end of receiving module and load connect; first control module and the second control module wireless communication connect, and protection circuit includes voltage detection module, voltage comparison module and short block；The input terminal of voltage detection module with the voltage output end of receiving module for connecting, the output end of voltage detection module and the first input end of voltage comparison module connect, second input terminal of voltage comparison module inputs comparison voltage threshold value, and the output end of the voltage comparison module is connect with short block.So that wireless power receiving module is constantly in short-circuit condition by short block when there is over-voltage exception, realizes the decoupling of wireless power receiving module and load.
Description
Technical field
The invention belongs to electronic technology field more particularly to a kind of wireless charging device and its protection circuits.
Background technique
The charger to charge for electric car and electric bicycle batteries operates mainly in constant current section.In non-contact charge
Under mode, energy transmitting end (primary side system) and energy acceptance end (secondary edge system) needs to pass through nothing while transmitting energy
Line communicates to interact data, and then forms the closed-loop control of entire wireless charging system.The energy of wireless charging system connects
Receiving end is generally integrated on electrical equipment or battery, and the restrictive conditions such as volume, heat dissipation, cost determine setting for energy acceptance end
Meter high power density, low cost and high reliability as far as possible.At present in most of wireless charging products, energy acceptance end is only
Secondary coil is contained, three major parts of compensation network and high-frequency rectification, under the conditions of constant current output, load cannot open a way,
Otherwise output voltage will rapidly rise, so that the work of energy receiving end is in short-circuit condition.Since data transmission delay and system are rung
The reasons such as speed are answered, energy transmitting end can not be relied solely on and adjust output power to realize that total system is protected.
To guarantee charging safety, idling consumption, the secondary controller of wireless charging system and the control electricity of relay are reduced
It is generally derived from high-pressure side, rather than provides vulnerabilities scan power supply by electrical equipment.It carves at the beginning, output relay disconnects, former
Edge system injects micro-energy, and secondary edges generating line voltage activates secondary controller after increasing, former pair side realizes that communication is shaken hands, interaction number
According to.Output relay is opened after shaking hands successfully, into charging flow, primary side increases input power, realizes function by wireless telecommunications
The closed-loop control of rate output.After secondary side output voltage or electric current are higher than protection threshold value, by short-circuiting device by high voltage bus and ground
Short circuit is realized and decouples battery and non-contact charger.However DC bus-bar voltage is down to 0V after short circuit decoupling, can not be secondary side
Controller and short-circuiting device power supply, therefore excessively high output voltage can still damage load (battery pack) and charging equipment.
In conclusion step voltage is increased and then is damaged after wireless charging device will cause under the open circuit situations such as load at present
The problem of battery group and charging equipment.
Summary of the invention
In view of this, the embodiment of the invention provides a kind of wireless charging device and its protection circuits, it is intended to solve current
Wireless charging mode increases and then damages battery group and charging equipment there are will cause rear step voltage in the case of load open circuit
Problem.
First aspect of the embodiment of the present invention provides a kind of protection circuit, is applied to wireless charging device, the wireless charging
Electric equipment includes wireless power transmitting terminal and wireless power receiving end, the wireless power transmitting terminal include the first control module and
Power supply module, the wireless power receiving end include the second control module and receiving module, the voltage output of the receiving module
For connecting with load, first control module and second control module wireless communication are connected at end；
The protection circuit includes voltage detection module, voltage comparison module and short block；
The input terminal of the voltage detection module with the voltage output end of the receiving module for connecting, the voltage inspection
The output end for surveying module is connect with the first input end of the voltage comparison module, the second input terminal input of voltage comparison module
The output end of comparison voltage threshold value, the voltage comparison module is connect with short block；
The voltage detection module is exported for detecting receiving module to the output voltage of load；
The voltage comparison module is for the output voltage to be compared with comparison voltage threshold value, when the output electricity
When pressure is beyond the comparison voltage threshold value, output control level to the short block；
The short block is used for the constant conduction when receiving the control level, makes the receiving module short circuit.
Second aspect of the embodiment of the present invention provides a kind of wireless charging device, and the wireless charging device includes wireless function
Rate transmitting terminal, protection with the wireless power receiving end of wireless power transmitting terminal wireless connection and as described in relation to the first aspect
Circuit, the protection circuit are connect with the wireless power receiving end.
Wireless charging device provided in an embodiment of the present invention and its protection circuit, by leading to when over-voltage exception occurs in load
Crossing short block makes wireless power receiving module be constantly in short-circuit condition, realizes the solution of wireless power receiving module and load
Coupling is unable to maintain that short-circuiting device is powered after avoiding the second control module power loss, after short-circuit decoupled state continues for some time, wirelessly
Power sending module can stop powering, and be effectively protected load and wireless charging device, solve current wireless charging device negative
It will cause the problem of rear step voltage increases and then damages battery group and charging equipment under the open circuit situations such as load.
Detailed description of the invention
It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to embodiment or description of the prior art
Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is only of the invention some
Embodiment for those of ordinary skill in the art without any creative labor, can also be according to these
Attached drawing obtains other attached drawings.
Fig. 1 is the structural schematic diagram for the protection circuit that the embodiment of the present invention one provides；
Fig. 2 is the exemplary circuit schematic diagram for the protection circuit that the embodiment of the present invention one provides；
The structural schematic diagram of the position Fig. 3 wireless charging device provided by Embodiment 2 of the present invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
It should be noted that term " includes " and their any changes in description and claims of this specification
Shape, it is intended that cover and non-exclusive include.Such as system, product or the equipment comprising a series of units are not limited to arrange
Unit out, but optionally further comprising the step of not listing or unit, or optionally further comprising for these products or set
Standby intrinsic other units.In addition, term " first ", " second " and " third " etc. be for distinguishing different objects, not for
Particular order is described.
The embodiment of the present invention is in order to solve current wireless charging device step voltage after load etc. will cause under open circuit situations
It increases and then damages battery group and the problem of charging equipment, provide a kind of wireless charging device and its protection circuit, pass through
Protection circuit makes wireless power receiving module be constantly in short-circuit condition when over-voltage exception occurs in load by short block, real
The decoupling of existing wireless power receiving module and load is unable to maintain that short-circuiting device is powered after avoiding the second control module power loss, short
After road decoupled state continues for some time, wireless power sending module can stop powering, and be effectively protected load and wireless charging
Device.
In order to illustrate above-mentioned wireless charging device and its protection circuit, carried out specifically below in conjunction with specific embodiment
It is bright:
Embodiment one:
The structure that Fig. 1 shows the protection circuit of the offer of the embodiment of the present invention one illustrates only and this for ease of description
The relevant part of inventive embodiments, details are as follows:
Referring to Fig. 1, a kind of protection circuit 100 provided in an embodiment of the present invention, be applied to wireless charging device, for
The wireless power receiving end of wireless charging device connects.Above-mentioned wireless charging device includes wireless power transmitting terminal 200 and wireless
Power receiving end 300, wireless power transmitting terminal 200 include the first control module 210 and power supply module 220, and wireless power receives
End 300 includes the second control module 310 and receiving module 320, and the output end of receiving module 320 is used for and load (battery packet)
Connection, the first control module 210 and the second control 220 modules wireless communication connect.
Protecting circuit 100 includes voltage detection module 110, voltage comparison module 120 and short block 130.
The input terminal of voltage detection module 110 with the voltage output end of receiving module 320 for connecting, voltage detection module
110 output end is connect with the first input end of voltage comparison module 120, the second input terminal input of voltage comparison module 120
The output end of comparison voltage threshold value, voltage comparison module 120 is connect with short block 130.
Voltage detection module 110 is used to detect the output voltage of the output of receiving module 320 to load.
Voltage comparison module 120 is for the output voltage to be compared with comparison voltage threshold value, when output voltage is super
Out when comparison voltage threshold value, output control level to short block 130.
Short block 130 is used for the constant conduction when receiving control level, keeps receiving module 320 short-circuit.
In a particular application, above-mentioned first control module 210 and the second control module 310 can pass through Infrared Wireless Communication
Mode realizes communication connection, can also be realized and be communicated to connect by bluetooth, without restriction herein.
In a particular application, electric energy is transmitted to above-mentioned reception mould by resonant mode electromagnetic induction by above-mentioned power supply module 220
Block 320, the voltage output end output voltage by receiving module 320 charge to battery packet to (battery packet) is loaded.
In a particular application, when there is over-voltage exception, the voltage of the first input end of voltage comparison module 120 can be higher than
Comparison voltage threshold value, voltage comparison module 120 will export control level to short block 130 at this time.Above-mentioned over-voltage is wrapped extremely
Include mistake caused by wireless power receiving end opens a way (load open circuit) in abnormal cases, causes load to become smaller due to poor contact
The raised exception of output voltage of the voltage output end of receiving module caused by reduce off-flavor is normal and other reasons, is not limited herein
System.It should be noted that since wireless power receiving end works in constant current state, in its load open circuit or poor contact, meeting
The output voltage VDD of the voltage output end of receiving module is caused to increase, i.e. the first input end of input voltage comparison module 120
Voltage can increase.
In a particular application, the second control module 310 of wireless power receiving end 300 is by the voltage of receiving module 320
The working power that the output voltage VDD of output end is obtained after power-switching circuit carries out power supply conversion, working power 5V/
The DC power supply of 3.3V.
As an embodiment of the present embodiment, above-mentioned protection circuit further includes power module, above-mentioned power module
Input terminal for connecting with the voltage output end of receiving module, control with voltage comparator and second respectively by the output end of power module
The connection of molding block.
In a particular application, the voltage received by electric power source pair of module obtains 5V working power after carrying out DC/DC decompression,
And 5V working power is input to the second control module, operating voltage is provided for the second control module.And it generates preset
Comparison voltage threshold value, and the comparison voltage threshold value is input to the second input terminal of voltage comparison unit, as reference voltage into
Row voltage compares.
As an embodiment of the present embodiment, above-mentioned power module includes pressure unit and voltage conversion unit；Drop
Press the input terminal of unit for the input terminal of power module, the output end of pressure unit and the input terminal of voltage conversion unit connect,
First output end of voltage conversion unit is connect with second control module, the output end of voltage conversion unit and the voltage
Comparison module connection.
As shown in Fig. 2, as an embodiment of the present invention, Fig. 2 shows the exemplary circuits of the protection circuit 100 of the present embodiment
Schematic diagram.
Referring to Fig. 2, in a particular application, above-mentioned voltage comparison module includes that voltage compares as a kind of implementation
Device U1.The first end of voltage comparator U1 is the first input end of voltage comparison module, and the second end of voltage comparator U1 is electricity
The second input terminal of comparison module is pressed, the third end of voltage comparator U1 is the output end of voltage comparison module.
In a particular application, above-mentioned short block includes thyristor Q1, and the first end of above-mentioned thyristor Q1 is compared with voltage
Module connection, the second end of thyristor Q1 and the voltage output end of receiving module connect, the third end ground connection of thyristor Q1.
Above-mentioned current foldback circuit is described further below in conjunction with working principle and Fig. 2:
When the abnormal conditions such as poor contact, open circuit occurs during the charging process in battery group, since wireless power receives
Hold work under constant current mode, be followed by load (battery group) open circuit (or poor contact) will cause receiving module voltage it is defeated
The output voltage VDD of outlet is increased, and the output voltage that voltage detection module 110 detects increases, and the output electricity that will test
Pressure is input to voltage comparator U1 and is compared with comparison voltage threshold value, when output voltage is higher than comparison voltage threshold value, voltage
Above-mentioned thyristor Q1 is connected in comparator U1 output high level, after thyristor Q1 conducting, so that wireless power receiving end
Short circuit, the voltage of DC bus is reduced to 0 at this time, so that the second control module 310 powers off.However wireless power transmitting terminal
The voltage of input is not reduced, due to the constant-current characteristics of system, other than turn on thyristors moment causes biggish dash current,
The current value for flowing through thyristor remains steady state, according to thyristor characteristics, as long as having follow current to flow through nothing after conducting
On state is maintained by how trigger voltage changes thyristor, therefore thyristor remains on state.Due to bus electricity
Pressure is 0 (i.e. output voltage is 0), therefore 310 power loss of the second module does not work, and interrupts the channel radio with the first control module 210
News connection, when the first control module 210 of wireless power transmitting terminal detects the communicating interrupt of itself and the second control module 310
When, it will judge communication abnormality occur and then stop powering.By simply protecting circuit to realize the overvoltage protection of pure hardware, and
The protection circuit has high reliability, and the protection circuit of the low wireless charging device provided in this embodiment of cost of implementation is occurring
So that wireless power receiving module is constantly in short-circuit condition by short block when over-voltage exception, realizes wireless power receiving module
With the decoupling of load.It is unable to maintain that short-circuiting device is powered after avoiding the second control module power loss, continues one section in short-circuit decoupled state
After time, wireless power sending module can stop powering, and be effectively protected load and wireless charging device.
Protection circuit provided in this embodiment, by making wireless power by short block when over-voltage exception occurs in load
Receiving module is constantly in short-circuit condition, realizes the decoupling of wireless power receiving module and load, and the second control module is avoided to lose
It is unable to maintain that short-circuiting device is powered after electricity, after short-circuit decoupled state continues for some time, wireless power sending module can stop supplying
Electricity is effectively protected load and wireless charging device, and solve current wireless charging device will cause under the open circuit situations such as load
The problem of step voltage increases and then damages battery group and charging equipment afterwards.
Embodiment two:
Wireless charging device 10 provided by Embodiment 2 of the present invention.Above-mentioned wireless charging device 10 is sent including wireless power
Guarantor described in end 200, the wireless power receiving end 300 being wirelessly connected with the wireless power transmitting terminal 200 and embodiment one
Protection circuit 100.
In a particular application, wireless power transmitting terminal 200 includes the first control module 210 and power supply module 220, and power connects
Receiving module 300 includes the second control module 310 and receiving module 320, and the voltage output end of receiving module 320 is used to connect with load
It connects, the first control module 210 and the second control module 310 communicate to connect；Protection circuit 100 is connect with receiving module 320.
In a particular application, above-mentioned first control module 210 and the second control module 310 can pass through Infrared Wireless Communication
Mode realizes communication connection, can also be realized and be communicated to connect by bluetooth, without restriction herein.
In a particular application, electric energy is transmitted to above-mentioned reception mould by resonant mode electromagnetic induction by above-mentioned power supply module 220
Block 320, the voltage output end output voltage by receiving module 320 charge to battery packet to (battery packet) is loaded.
In a particular application, above-mentioned receiving module 320 includes receiving unit 321 and rectification output unit 322.
Receiving unit 321 and power supply module 220 are wirelessly connected, and receiving unit 321 is connect with rectification output unit 322, whole
The output end for flowing output unit 322 is the voltage output end of receiving module 320.
In a particular application, above-mentioned receiving unit 321 includes receiving coil.Power supply module is received by above-mentioned receiving coil
The wireless power of output.
In a particular application, above-mentioned rectification output unit 322 includes rectifier.Above-mentioned receiving coil is connect by rectifier
The wireless power received generates output voltage after carrying out rectifying and wave-filtering and exports to load.
It should be noted that wireless charging device provided in an embodiment of the present invention, as real with method shown in Fig. 1 of the present invention
It applies example and is based on same design, bring technical effect is identical as embodiment of the method shown in Fig. 1 of the present invention, and particular content can be found in
Narration in embodiment of the method shown in Fig. 1 of the present invention, details are not described herein again.
Therefore, wireless charging device provided in this embodiment equally can pass through short circuit when over-voltage exception occurs in load
Module makes wireless power receiving module be constantly in short-circuit condition, realizes the decoupling of wireless power receiving module and load, avoids
It is unable to maintain that short-circuiting device is powered after second control module power loss, after short-circuit decoupled state continues for some time, wireless power hair
It send module that can stop powering, is effectively protected load and wireless charging device, solve current wireless charging device and opened in load etc.
It will cause the problem of rear step voltage increases and then damages battery group and charging equipment in the case of road.
The above is merely preferred embodiments of the present invention, be not intended to limit the invention, it is all in spirit of the invention and
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within principle.
Claims (10)
1. a kind of protection circuit, which is characterized in that be applied to wireless charging device, the wireless charging device includes wireless power
Transmitting terminal and wireless power receiving end, the wireless power transmitting terminal includes the first control module and power supply module, described wireless
Power receiving end includes the second control module and receiving module, and the voltage output end of the receiving module is used to connect with load,
First control module and second control module wireless communication connect；
The protection circuit includes voltage detection module, voltage comparison module and short block；
The input terminal of the voltage detection module with the voltage output end of the receiving module for connecting, the voltage detecting mould
The output end of block is connect with the first input end of the voltage comparison module, and the second input terminal input of voltage comparison module is compared
The output end of voltage threshold, the voltage comparison module is connect with short block；
The voltage detection module is exported for detecting receiving module to the output voltage of load；
The voltage comparison module is for the output voltage to be compared with comparison voltage threshold value, when the output voltage is super
Out when the comparison voltage threshold value, output control level to the short block；
The short block is used for the constant conduction when receiving the control level, makes the receiving module short circuit.
2. protection circuit according to claim 1, which is characterized in that the protection circuit further includes power module；
The input terminal of the power module with the voltage output end of the receiving module for connecting, the output of the power module
End is connect with voltage comparison module, and the output end of the power module is also used to connect with second control module.
3. protection circuit according to claim 2, which is characterized in that the power module includes that pressure unit and voltage turn
Change unit；
The input terminal of the pressure unit is the input terminal of the power module, the output end of the pressure unit and the voltage
The input terminal of converting unit connects, and the first output end of the voltage conversion unit is connect with second control module, described
The output end of voltage conversion unit is connect with the voltage comparison module.
4. protection circuit according to claim 1, which is characterized in that the voltage comparison module includes voltage comparator；
The first end of the voltage comparator be the voltage comparison module first input end, the second of the voltage comparator
End is the second input terminal of the voltage comparison module, and the third end of the voltage comparator is the defeated of the voltage comparison module
Outlet.
5. protection circuit according to claim 1, which is characterized in that the short block includes thyristor；
The first end of the thyristor is connect with the voltage comparison module, the second end of the thyristor and the receiving module
Voltage output end connection, the thyristor third end ground connection.
6. a kind of wireless charging device, which is characterized in that the wireless charging device includes wireless power transmitting terminal and the nothing
The wireless power receiving end and the protection circuit as described in claim 1 to 5 any one that linear heat generation rate transmitting terminal is wirelessly connected,
The protection circuit is connect with the wireless power receiving end.
7. wireless charging device according to claim 6, which is characterized in that the wireless power transmitting terminal includes the first control
Module and power supply module, the power receiving module include the second control module and receiving module, the voltage of the receiving module
Output end is used to connect with load, and first control module and second control module communicate to connect；The protection circuit
It is connect with the receiving module.
8. wireless charging device according to claim 7, which is characterized in that the receiving module includes receiving unit and whole
Flow output unit；
The receiving unit and power supply module are wirelessly connected, and the receiving unit is connect with the rectification output unit, described whole
The output end for flowing output unit is the voltage output end of the receiving module.
9. wireless charging device according to claim 8, which is characterized in that the receiving unit includes receiving coil.
10. wireless charging device according to claim 8, which is characterized in that the rectification output unit includes rectifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910733303.7A CN110518706A (en) | 2019-08-09 | 2019-08-09 | A kind of wireless charging device and its protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910733303.7A CN110518706A (en) | 2019-08-09 | 2019-08-09 | A kind of wireless charging device and its protection circuit |
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| CN112564298A (en) * | 2020-11-10 | 2021-03-26 | 上海万暨电子科技有限公司 | Circuit protection system and method and LCC type wireless charging system |
| CN113472047A (en) * | 2021-07-21 | 2021-10-01 | Tcl通讯（宁波）有限公司 | Charging interface over-temperature protection circuit and terminal equipment |
| CN114362381A (en) * | 2021-12-13 | 2022-04-15 | 上海南芯半导体科技股份有限公司 | Overvoltage protection device for wireless charging system and control method thereof |
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