CN104659923B - PMU and its wireless power system of application - Google Patents
PMU and its wireless power system of application Download PDFInfo
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- CN104659923B CN104659923B CN201310578166.7A CN201310578166A CN104659923B CN 104659923 B CN104659923 B CN 104659923B CN 201310578166 A CN201310578166 A CN 201310578166A CN 104659923 B CN104659923 B CN 104659923B
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Classifications
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- H02J7/025—
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- H02J5/005—
Abstract
The present invention relates to a kind of PMU, applied to wireless power system, including：Rectifier, with input port to receive wireless power, and there is rectification output end to export DC voltage；First switch, and an external first protection electric capacity is coupled between one end of input port and the passage of first switch；Second switch, and an external second protection electric capacity is coupled between the other end of input port and the passage of second switch；There is provided a reference voltage for reference voltage end；Comparator, compares input with two and is respectively coupled to rectification output end and reference voltage end, and with comparing output end while being coupled to first switch and the control end of second switch.
Description
【Technical field】
The present invention is particularly a kind of to have overvoltage on a kind of PMU and its wireless power system of application
The PMU of protective effect and its wireless power system of application.
【Background technology】
Wireless power（wireless power）, or wireless energy transfer（wireless energy
transmission）, it is the mode sensed using near field, such as inductive（inductive coupling）, set by power supply
A kind of standby technology for transmitting its energy to power electronic equipment.For example in wireless charging（wireless charging）Application
In, electronic installation receives energy by wireless power, and the battery included by it is charged, and can transport in itself electronic devices simultaneously
It is used as.Due to transmitting energy between electronic installation and electric supply installation with inductive, do not run wires between the two, therefore
Electronic installation can accomplish that no conductive junction point is exposed with electric supply installation.Due to being designed without conductive junction point, wireless power technology can
To avoid the danger got an electric shock, and electric power transmission element is without exposed, therefore will not be corroded by the moisture content in air, oxygen etc..In addition,
Also due to the presence of contactless, therefore loss or the spark of mechanical wear when connection is with separating are not had（spark）Make
Into potentially dangerous.
The technology development of wireless power brings very big contribution in the use of medical applications and consumer electronics.
The technology of wireless power makes medical implant apparatus safer, and user can be in the case where not damaging bodily tissue, to planting
The medical treatment device entered in human body is charged, and is passed through skin and other autologous tissues without live wire, is removed the wind of infection from
Danger.In addition, wireless charging also bring consumer electronic device use upper sizable convenience because device charging when without
It need to be connected with electric wire, as long as being put into charger nearby；Moreover, a technical charger can enter to multiple power devices
Advance electric, therefore multiple chargers can be saved in the case where there are multiple power devices, without taking multiple power outlets, and
And the trouble also wound mutually without a plurality of electric wire.
Fig. 1 is the schematic diagram of known wireless power system 100.In wireless power system 100 with power supply unit 110,
Feeder ear coupled capacitor 120 and the one wireless power transmitting terminal of formation of primary winding 130, and with secondary coil 150, input capacitance
160 form a wireless power receiving terminal.Wireless power transmitting terminal produces the wireless power 140 with alternating current aspect, and utilizes
Near field sensing mode, for example using（But it is not limited to）The inductive of primary winding 130 and secondary coil 150 so that
Wireless power receiving terminal is able to receive wireless power 140, and produces the electric power of an alternating current aspect with input rectifier 170.It is whole
It is the alternating current of reception is changed into a DC voltage and the DC voltage is exported to flow device 170.Wireless power system 100 can
Further to include voltage regulation unit 180, the DC voltage that rectifier 170 is exported is received, and produce a stable output electricity
Pressure is for the load circuit of rear class（Do not show in figure）Use, or produce stable an output voltage or output current with to an electricity
Pond is charged, and this is the application of wireless charging.
However, in the design of rectifier, due to needing the conversion efficiency in view of rectifier 170, therefore rectifier 170
In element generally have the tolerance rated value of a voltage, when the input voltage of rectifier 170 is higher than this tolerance rated value,
The service life for being likely to cause rectifier is shortened, or even is directly damaged.However as the gradually popularization of wireless power technology,
Wireless power system will also develop a variety of wireless power specifications, with response to a variety of application scenarios.Now
May occur the wireless power receiving terminal of relatively low power specification, receive the wireless power transmitting terminal institute of a higher power specification
The situation of the wireless power of transmitting, thus the input port formation one in rectifier is very likely caused higher than its tolerance rated value
Voltage, thus cause service life to shorten or damage.Also therefore, wireless power receiving terminal must be directed to above-mentioned situation,
Carry out necessary design protection.
【The content of the invention】
In view of the above problems, the present invention provides the wireless power system of a kind of PMU and its application, especially
It is the wireless power system of a kind of PMU acted on overvoltage protection and its application.
The present invention proposes a kind of PMU, applied to a wireless power system.Wireless power system further includes two
Secondary coil, input capacitance, the first protection electric capacity and the second protection electric capacity.Wherein input capacitance is coupled to one end of secondary coil
And one between power receiver end, and wireless power of the secondary coil to receive alternating current aspect.PMU enters one
Step includes rectifier, voltage regulation unit, first switch, second switch, reference voltage end and comparator.
Rectifier has input port and a rectification output end, the two ends of wherein input port be respectively coupled to power receiver end with
And the other end of secondary coil.Rectifier changes into a DC voltage, and rectification output end to the alternating current for receiving input port
To export described DC voltage.Voltage regulation unit is coupled to rectifier and receives described DC voltage, has to export
The VD of one load voltage value, or voltage regulation unit are also used to charge to a battery.
First protection electric capacity is coupled between one end of the passage of power receiver end and first switch, and first switch
The other end of passage is coupled to earth terminal.Second protection electric capacity is coupled to the other end of secondary coil and the passage of second switch
One end between, and the other end of the passage of second switch is coupled to earth terminal.
Reference voltage end is to provide a reference voltage.Comparator has two to compare input and compare output end, its
In two compare input and be respectively coupled to rectification output end and reference voltage end, and compare output end and opened while being coupled to first
The control end of pass and the control end of second switch.
The present invention more proposes a kind of wireless power system, and the wireless power system applied with foregoing PMU
System, with identical circuit composition.
The present invention effect be, disclosed herein PMU and its application wireless power system, can
During occurring the situation of overtension in the wireless power that it is received, the very first time produces the effect of protection, and can be further
Avoid PMU from constantly receiving too high voltage, and cause the service life of PMU to shorten even straight
Connect damage.
Feature for the present invention, implementation and effect, hereby coordinate schema to make most preferred embodiment detailed description as follows.
【Brief description of the drawings】
Fig. 1 is the schematic diagram of known wireless power system.
Fig. 2 be disclosed herein first embodiment wireless power system schematic diagram.
Fig. 3 be disclosed herein second embodiment wireless power system schematic diagram.
Fig. 4 be disclosed herein volt circuit of rationing the power supply an embodiment.
Fig. 5 be disclosed herein 3rd embodiment wireless power system schematic diagram.
Primary clustering symbol description：
100th, the input port of 200,300,500 wireless power system 2911
2912 rectification output ends
110th, the first switch of 210 power supply unit 293
120th, the second switch of 220 feeder ear coupled capacitor 294
130th, the reference voltage end of 230 primary winding 295
140th, the comparator of 240 wireless power 296
150th, 250 secondary coils 2961,2962 compare input
160th, 260 input capacitances 2963 compare output end
170th, 291 rectifiers 391,400 are rationed the power supply volt circuit
180th, the pressure limit switch of 292 voltage regulation unit 410
The current-limiting resistance of 265 power receiver end 420
The 270 first protection diode sequential circuits of electric capacity 430
The control end resistance of 275 earth terminal 440
280 second protection electric capacity 591 first are rationed the power supply volt circuit
290th, 390,590 PMUs 592 second are rationed the power supply volt circuit
【Embodiment】
Among specification and follow-up claim, " coupling " one word is comprising any directly and indirect herein
Electrical connection.Therefore, if a first device is coupled to a second device described in text, representing first device can be directly electric
Gas is connected to second device, or is electrically connected indirectly to second device by other devices or connection means.
Fig. 2 be disclosed herein first embodiment wireless power system 200 schematic diagram.Wireless power system
200 include secondary coil 250, the protection protection of electric capacity 270, second of input capacitance 260, first electric capacity 280, PMU
290.A wireless power 240 of the secondary coil 250 to receive alternating current aspect.Input capacitance 260 is coupled to secondary coil 250
One end and power receiver end 265 between.PMU 290 further comprises rectifier 291, voltage regulation unit 292,
One switch 293, second switch 294, reference voltage end 295 and comparator 296.
Rectifier 291 has the two ends difference coupling of input port 2911 and rectification output end 2912, wherein input port 2911
It is connected to the other end of power receiver end 265 and secondary coil 250.Rectifier 291 is to the exchange that receives input port 2911
Electricity changes into a DC voltage, and rectification output end 2912 is to export described DC voltage.Voltage regulation unit 292 is coupled to rectification
Device 291 simultaneously receives described DC voltage, has the VD of a load voltage value to export, and to its output end
One load circuit of coupling（Do not show in figure）It is powered；Or voltage regulation unit 292 is also used to a battery（Do not show in figure）
Charged, such as to determine voltage（Constant voltage, CV）Pattern or determine electric current（Constant current, CC）
Pattern charges to battery.
First protection electric capacity 270 is coupled between one end of the passage of power receiver end 265 and first switch 293, and
The other end of the passage of first switch 293 is coupled to earth terminal 275.Second protection electric capacity 280 is coupled to the another of secondary coil 250
Between one end of the passage of one end and second switch 294, and the other end of the passage of second switch 294 is coupled to earth terminal
275。
Reference voltage end 295 is to provide a reference voltage.Comparator 296 have two compare input 2961,2962 with
And compare output end 2963, wherein two compare input 2961,2962 and are respectively coupled to rectification output end 2912 and with reference to electricity
Pressure side 295, and compare output end 2963 while being coupled to the control end of first switch 293 and the control end of second switch 294.
First switch 293 and second switch 294 can be N-type effect electric crystals（N-type field-effect transistor）
Or bipolar npn junction transistors（NPN-type bipolar junction transistor）, but not as
Limit.It is worth noting that, the set of field effect electric crystal includes metal oxide semiconductor field effect electric crystal（metal-oxide-
Semiconductor field-effect transistor, MOSFET）, Junction fet（junction field-
Effect transistor, JFET）, insulation lock bipolar transistor（Insulated-gate bipolar transistor,
IGBT）Or the semiconductor element with structure similar to said elements and function.In addition, and the control end of field effect electric crystal be
Refer to its gate（gate terminal）, the passage of field effect electric crystal refers to its source electrode（source terminal）And drain
（drain terminal）Between passage；And bipolarity junction transistors（Bipolar junction transistor,
BJT）Control end refer to its base stage（base terminal）, the passage of bipolarity junction transistors refers to its collector
（collector terminal）And emitter-base bandgap grading（emitter terminal）Between passage.
In addition, wireless power system 200 may further include a wireless power transmitting terminal, be by power supply unit 210,
Feeder ear coupled capacitor 220 and the concatenation of primary winding 230 are formed, to produce wireless power 240 and be sent out by primary winding 230
Penetrate wireless power 240；That is, power supply unit 210 is to produce energy, and through feeder ear coupled capacitor 220 by energy coupling
To primary winding 230, primary winding 230 transforms energy into wireless power 240 and launches wireless power 240.
Furthermore, due to manufacture of semiconductor（semiconductor process）The progress of technology, PMU 290
It can be the IC that manufacture of semiconductor is realized（Integrated circuit, IC）, that is, manufacture of semiconductor is utilized, will
Element included by PMU 290 is integrated in one or more integrated circuit chips（IC chip）In, and can
To be further packaged（package）And with stitch（pins）Electrical connection is done with external circuit.
Furthermore, because the first protection protection electric capacity 280 of electric capacity 270 and second has larger capacitance, for example, 470
How farad（Nano-Farad, nF）, and can not be directly integrated in integrated circuit chips with existing manufacture of semiconductor technology, because
This, the first protection protection electric capacity 280 of electric capacity 270 and second can be the electrochemical capacitor of circumscribed（electrolytic
capacitor）Or ceramic condenser（ceramic capacitor）, wherein conventional electrochemical capacitor includes aluminium（aluminum）
Electrochemical capacitor and tantalum（tantulum）Electrochemical capacitor etc..
Further illustrate, when wireless power system 200 is in normal operating, the voltage of rectification output end 2912 is less than ginseng
The reference voltage of voltage end 295 is examined, the voltage quasi position that the comparison output end 2963 of comparator 296 is exported causes first switch 293
And the passage of second switch 294 is cut-off, now the first protection protection electric capacity 280 of electric capacity 270 and second is suspension joint
（floating）, therefore the influence of essence will not be produced to the operation of rectifier.For example compare output end 2963 export equivalent to
0 volt of the voltage quasi position of earth terminal 275 so that its aspect is N-type effect electric crystal or bipolar npn junction transistors
The passage of first switch 270 and second switch 294 is cut-off.It is otherwise noted that the first protection electric capacity 270 of suspension joint
And second protection electric capacity will now be discharged by the leakage path of itself, that is, after long-time, first protects electric capacity
270 and second protection electric capacity two end pole plates would tend to be not present the quantity of electric charge.
However, when the wireless power system 200 with relatively low power specification, receiving another group has higher power specification
Wireless power transmitting terminal launched wireless power when, the input port 2911 of rectifier there may be one and be higher than normal operating
The voltage of scope, so that the rectification output end 2912 of rectifier produces a higher magnitude of voltage；Work as rectification output end
When 2912 voltage is more than the reference voltage of reference voltage end 295, now compares the output of output end 2,963 one and be more than first switch
293 and the threshold voltage of second switch 294（threshold voltage）Voltage quasi position so that first switch 270 and
Two switch 294 passage to turn on, and now the first protection protection electric capacity 280 of electric capacity 270 and second will play following several works
With：Firstth, the first protection electric capacity 270 is coupled to earth terminal 275 by first switch 293, and the second protection electric capacity 280 passes through the
Two switches 294 are coupled to earth terminal 275, can be effectively reduced the two ends of input port 2911（Relative to earth terminal 275）It is absolute
Voltage, prevents the absolute voltage at the two ends of input port 2911 to be resistant to rated value higher than it；Secondth, one in parallel of input port 2911 by
First protection electric capacity 270 and second protection electric capacity 280 series connection formed equivalent bulky capacitor, and with input capacitance 260 and two
Secondary coil 250 is connected and forms a complete current loop, therefore is worked as on secondary coil 250 in the presence of a larger voltage
When, because relative to described equivalent bulky capacitor, the capacitance of input capacitance 260 is minimum, therefore input capacitance 260 with it is described
Equivalent bulky capacitor partial pressure as a result, it is possible to avoid the voltage on input port 2911, that is, the voltage difference at the two ends of input port 2911 is high
Rated value is resistant in it.
Explanation more than is it is to be understood that first switch 293, second switch 294, reference voltage end 295, comparator
296th, the protection circuit that the first protection protection electric capacity 280 of electric capacity 270 and second is constituted, can avoid PMU
290 constantly receive too high voltage, and cause the service life of PMU 290 to shorten even directly damage.
Fig. 3 be disclosed herein second embodiment wireless power system 300 schematic diagram.Wireless power system
The function and implementation of each element in 300, may be referred to wireless power system 200 disclosed by Fig. 2 each
The explanation of counter element.Wireless power system 300 does not exist together with wireless power system 200, is in wireless power system 300
PMU 390 further include volt circuit 391 of rationing the power supply.Volt circuit of rationing the power supply 391 has a pressure limiting current path
It is coupled between rectification output end 2912 and earth terminal 275, and works as the voltage of rectification output end 2912 and is more than a pressure limiting threshold values,
Pressure limiting current path is conducting, and when the voltage of rectification output end 2912 is less than pressure limiting threshold values, the cut-off of pressure limiting current path.
Further illustrate, be by too high rectification output end in the operation of the protection circuit of wireless power system 200
2912 voltage causes comparator 296 to react and after turning on first switch 293 and second switch 294, passes through the first protection
The protection electric capacity 280 of electric capacity 270 and second is dragged down after the voltage of input port 2911, then is reacted and to reduce original too high rectification defeated
Go out the voltage at end 2912, therefore form certain reaction time, and be likely to result in before protection circuit is in time for reaction, rectification
The related elements of output end 2912 cause damage due to overtension.On the other hand, in the electricity of wireless power system 300
The volt circuit 391 of rationing the power supply added in source control unit 390, then can in the overtension of rectification output end 2912, first
The voltage of time restriction rectification output end 2912, and then protect the related elements of rectification output end 2912；Yet with voltage limit
The guiding path of circuit 391 can be equivalent to a certain size resistance, only have limited current capacity, it is therefore necessary to enter one
Step starts second-line protective effect, that is, first switch 293, second switch 294, first by the reaction of comparator 296
The protective effect that the protection protection electric capacity 280 of electric capacity 270 and second is provided.
Explanation more than is it is to be understood that the volt circuit 391 of rationing the power supply of wireless power system 300, first switch 293, the
Two switches 294, reference voltage end 295, the protection protection electric capacity 280 of electric capacity 270 and second of comparator 296, first are constituted
Protection circuit, the overtension of rectification output end 2912 can be avoided in the very first time, PMU is further avoided
290 constantly receive too high voltage, and cause the service life of PMU 290 to shorten even directly damage.
Fig. 4 be disclosed herein volt circuit of rationing the power supply an embodiment, that is, volt circuit of rationing the power supply 400.Volt circuit of rationing the power supply 400
Including pressure limit switch 410, current-limiting resistance 420, diode sequential circuit 430 and control end resistance 440.
One end of the passage of pressure limit switch 410 is coupled to earth terminal 275.Current-limiting resistance 420 is coupled to rectification output end
2912 and pressure limit switch 410 passage the other end between.Diode sequential circuit 430 is by several diode element strings
Connect and form, between the control end for being coupled to rectification output end 2912 and pressure limit switch 410.Control end resistance 440 is coupled to limit
Compress switch 410 control end and earth terminal 275 between.Pressure limit switch 410 can be that N-type effect electric crystal or NPN type are double
Polarity junction transistors, but be not limited thereto.
Further illustrate, it is assumed that diode sequential circuit 430 is forward to be concatenated to form by N number of diode element, and each
The forward bias voltage drop of two grades of volume elements parts is Vf, then when the voltage of rectification output end 2912 is more than N*Vf, diode sequential circuit 430
Begin to turn on.And with the voltage increase of rectification output end 2912, the voltage of the control end of pressure limit switch 410 also with increase,
Until the threshold voltage more than pressure limit switch 410, the passage of pressure limit switch 410 is begun to turn on, and forms institute with current-limiting resistance 420
The pressure limiting current path stated, pressure limiting current path can be equivalent to a certain size resistance, and with the equivalent output resistance of rectifier
The relation of a partial pressure is formed, therefore can effectively suppress the rising of the voltage of rectification output end 2912.
It is worth noting that, the embodiment of the volt circuit 391 of rationing the power supply disclosed by Fig. 3 is not with the embodiment disclosed by Fig. 4
It is limited, the volt circuit 400 of rationing the power supply disclosed by Fig. 4 is only used as spirit to illustrate the invention, is not intended to limit the invention
Scope.One skilled in the art, all having the ability can be according to its actual application scenarios, and is learnt in known techniques
The circuit aspect of suitable volt circuit 391 of rationing the power supply simultaneously is carried out.
Fig. 5 be disclosed herein fourth embodiment wireless power system 500 schematic diagram.Wireless power system
The function and implementation of each element in 500, may be referred to wireless power system 200 disclosed by Fig. 2 each
The explanation of counter element.Wireless power system 500 does not exist together with wireless power system 200, is in wireless power system 500
PMU 590 further include first and ration the power supply and volt circuit 591 and second ration the power supply volt circuit 592.First limit
There is potential circuit 591 first pressure limiting current path to be coupled between power receiver end 265 and earth terminal 275, and work as electric power
The voltage of receiving terminal 265 is more than the first pressure limiting threshold values, the conducting of the first pressure limiting current path, and works as the voltage at power receiver end 265
Less than the first pressure limiting threshold values, the cut-off of the first pressure limiting current path.Second rations the power supply volt circuit 592 with the second pressure limiting current path coupling
It is connected between the other end of secondary coil 250 and earth terminal 275, and when the voltage of the other end of secondary coil 250 is more than the
Two pressure limiting threshold values, the conducting of the second pressure limiting current path, and when the voltage of the other end of secondary coil 250 is less than the second pressure limiting valve
Value, the cut-off of the second pressure limiting current path.
In addition, first rations the power supply volt circuit 591 or the second volt circuit 592 of rationing the power supply refers to piezoelectricity of rationing the power supply disclosed by Fig. 4
Road 400 is its suitable embodiment.It is important to note, however, that first rations the power supply and volt circuit 591 or second rations the power supply volt circuit 592
Embodiment be not limited with the embodiment disclosed by Fig. 4, the volt circuit 400 of rationing the power supply disclosed by Fig. 4 is only made to illustrate the invention
Spirit use, the scope being not intended to limit the invention.One skilled in the art, all having the ability can be according in fact
The application scenarios on border, and learn that suitable first is rationed the power supply in known techniques and volt circuit 591 or second ration the power supply volt circuit 592
Circuit aspect is simultaneously carried out.
Further illustrate, first added in the PMU 590 of wireless power system 500 is rationed the power supply volt circuit
591 and second ration the power supply volt circuit 592, can respectively in the overtension of the two-end-point of input port 2911 of rectifier 291,
The inner member of one guardtime rectifier 291.Ration the power supply and volt circuit 591 and second ration the power supply volt circuit 592 yet with first
Guiding path can be equivalent to a certain size resistance respectively, only have limited current capacity, it is therefore necessary to by than
Start second-line protection compared with the reaction of device 296, that is, the passage of conducting first switch 293 and second switch 294, make the
The one protection protection electric capacity 280 of electric capacity 270 and second is played such as protection illustrated in first embodiment and second embodiment
Effect.
Explanation more than is it is to be understood that wireless power system 300 first is rationed the power supply volt circuit 591, the second voltage limit
Circuit 592, first switch 293, second switch 294, reference voltage end 295, the protection electric capacity 270 of comparator 296, first and the
The protection circuit that two protection electric capacity 280 are constituted, can avoid the overtension of input port 2911, further in the very first time
Avoid PMU 290 from constantly receiving too high voltage, and cause the service life of PMU 290 to shorten
Even directly damage.
Although embodiments of the invention are disclosed above described, the present invention is so not limited to, it is any to be familiar with related art techniques
Person, without departing from the spirit and scope of the present invention, such as according to the shape described in the present patent application scope, construction, feature and number
Amount, which is worked as, can do a little change, therefore the scope of patent protection of the present invention must regard claim institute circle appended by this specification
The person of determining is defined.
Claims (18)
1. a kind of PMU, applied to a wireless power system, the wireless power system further include a secondary coil,
One input capacitance, one first protection electric capacity and one second protection electric capacity, wherein the input capacitance is coupled to the secondary line
Between one end of circle and a power receiver end, and a wireless power of the secondary coil to receive alternating current aspect, its
It is characterised by, the PMU is included：
One rectifier, including an input port and a rectification output end, wherein the two ends of the input port be respectively coupled to it is described
Power receiver end and the other end of the secondary coil, the rectifier are changed into the alternating current for receiving the input port
One DC voltage, and the rectification output end is to export the DC voltage；
One voltage regulation unit, is coupled to the rectifier and receives the DC voltage, to export a VD or right
One battery is charged；
One first switch, wherein the first protection electric capacity is coupled to the passage of the power receiver end and the first switch
One end between, and the other end of the passage of the first switch is coupled to an earth terminal；
One second switch, wherein the second protection electric capacity is coupled to the other end and the second switch of the secondary coil
Passage one end between, and the other end of the passage of the second switch is coupled to the earth terminal；
One reference voltage end, to provide a reference voltage；And
One comparator, including two compare input and one compare output end, wherein described two compare input and are respectively coupled to
The rectification output end and the reference voltage end, and described compare output end while being coupled to the control of the first switch
End and the control end of the second switch.
2. PMU as claimed in claim 1, it is characterised in that wherein further include one and ration the power supply volt circuit, including one
Pressure limiting current path is coupled between the rectification output end and the earth terminal, and when the voltage of the rectification output end is big
In a pressure limiting threshold values, the pressure limiting current path conducting, and the voltage for working as the rectification output end is less than the pressure limiting threshold values, institute
State the cut-off of pressure limiting current path.
3. PMU as claimed in claim 2, it is characterised in that wherein described voltage limit circuit is further included：
One pressure limit switch, one end of the passage of the pressure limit switch is coupled to the earth terminal；
Between one current-limiting resistance, the other end for being coupled to the passage of the rectification output end and the pressure limit switch；
One diode sequential circuit, is to be formed by several diode elements concatenation, is coupled to the rectification output end and institute
Between the control end for stating pressure limit switch；
One control end resistance, is coupled between the control end of the pressure limit switch and the earth terminal.
4. PMU as claimed in claim 1, it is characterised in that wherein further include：
One first rations the power supply volt circuit, including one first pressure limiting current path is coupled to the power receiver end and the earth terminal
Between, and when the voltage at the power receiver end is more than one first pressure limiting threshold values, the first pressure limiting current path is turned on, and is worked as
The voltage at the power receiver end is less than the first pressure limiting threshold values, the first pressure limiting current path cut-off；And
One second rations the power supply volt circuit, including one second pressure limiting current path is coupled to the other end of the secondary coil and described
Between earth terminal, and when the voltage of the other end of the secondary coil is more than one second pressure limiting threshold values, the second pressure limiting electric current
Path is turned on, and when the voltage of the other end of the secondary coil is less than the second pressure limiting threshold values, the second pressure limiting electric current
End in path.
5. PMU as claimed in claim 4, it is characterised in that wherein described first rations the power supply volt circuit or described
Two volt circuits of rationing the power supply are further included：
One pressure limit switch, one end of the passage of the pressure limit switch is coupled to the earth terminal；
One current-limiting resistance, is coupled to the other end and the power receiver end or described secondary of the passage of the pressure limit switch
Between the other end of coil；
One diode sequential circuit, is to be formed by several diode elements concatenation, is coupled to the control end of the pressure limit switch
And between the power receiver end or the other end of the secondary coil；
One control end resistance, is coupled between the control end of the pressure limit switch and the earth terminal.
6. PMU as claimed in claim 1, it is characterised in that wireless power system further includes wireless power hair
End is penetrated, is formed by a power supply unit, a feeder ear coupled capacitor and a primary winding concatenation, it is described wireless to produce
Electric power simultaneously launches the wireless power by the primary winding.
7. the PMU as any one of claim 1 to 6, it is characterised in that wherein described first switch with
And it is N-type effect electric crystal or bipolar npn junction transistors that the second switch, which is,.
8. the PMU as any one of claim 1 to 6, it is characterised in that wherein described power management list
Member is the IC to be realized with manufacture of semiconductor.
9. the PMU as any one of claim 1 to 6, it is characterised in that wherein described first protection electricity
It is electrochemical capacitor or ceramic condenser that appearance and the second protection electric capacity, which are,.
10. a kind of wireless power system, it is characterised in that the wireless power system is included：
One secondary coil, the wireless power to receive alternating current aspect；
One input capacitance, is coupled between one end of the secondary coil and a power receiver end；
One first protection electric capacity；
One second protection electric capacity；And
One PMU, comprising：
One rectifier, including an input port and a rectification output end, wherein the two ends of the input port be respectively coupled to it is described
Power receiver end and the other end of the secondary coil, the rectifier are changed into the alternating current for receiving the input port
One DC voltage, and the rectification output end is to export the DC voltage；
One voltage regulation unit, is coupled to the rectifier and receives the DC voltage, to export a VD or right
One battery is charged；
One first switch, wherein the first protection electric capacity is coupled to the passage of the power receiver end and the first switch
One end between, and the other end of the passage of the first switch is coupled to an earth terminal；
One second switch, wherein the second protection electric capacity is coupled to the other end and the second switch of the secondary coil
Passage one end between, and the other end of the passage of the second switch is coupled to the earth terminal；
One reference voltage end, to provide a reference voltage；And
One comparator, including two compare input and one compare output end, wherein described two compare input and are respectively coupled to
The rectification output end and the reference voltage end, and described compare output end while being coupled to the control of the first switch
End and the control end of the second switch.
11. wireless power system as claimed in claim 10, it is characterised in that wherein further include one and ration the power supply volt circuit, including
One pressure limiting current path is coupled between the rectification output end and the earth terminal, and when the voltage of the rectification output end
More than a pressure limiting threshold values, the pressure limiting current path conducting, and the voltage for working as the rectification output end is less than the pressure limiting threshold values,
The pressure limiting current path cut-off.
12. wireless power system as claimed in claim 11, it is characterised in that wherein described voltage limit circuit is further included：
One pressure limit switch, one end of the passage of the pressure limit switch is coupled to the earth terminal；
Between one current-limiting resistance, the other end for being coupled to the passage of the rectification output end and the pressure limit switch；
One diode sequential circuit, is to be formed by several diode elements concatenation, is coupled to the rectification output end and institute
Between the control end for stating pressure limit switch；
One control end resistance, is coupled between the control end of the pressure limit switch and the earth terminal.
13. wireless power system as claimed in claim 10, it is characterised in that wherein further include：
One first rations the power supply volt circuit, including one first pressure limiting current path is coupled to the power receiver end and the earth terminal
Between, and when the voltage at the power receiver end is more than one first pressure limiting threshold values, the first pressure limiting current path is turned on, and is worked as
The voltage at the power receiver end is less than the first pressure limiting threshold values, the first pressure limiting current path cut-off；And
One second rations the power supply volt circuit, including one second pressure limiting current path is coupled to the other end of the secondary coil and described
Between earth terminal, and when the voltage of the other end of the secondary coil is more than one second pressure limiting threshold values, the second pressure limiting electric current
Path is turned on, and when the voltage of the other end of the secondary coil is less than the second pressure limiting threshold values, the second pressure limiting electric current
End in path.
14. wireless power system as claimed in claim 13, it is characterised in that wherein described first rations the power supply volt circuit or described
Second volt circuit of rationing the power supply is further included：
One pressure limit switch, one end of the passage of the pressure limit switch is coupled to the earth terminal；
One current-limiting resistance, is coupled to the other end and the power receiver end or described secondary of the passage of the pressure limit switch
Between the other end of coil；
One diode sequential circuit, is to be formed by several diode elements concatenation, is coupled to the control end of the pressure limit switch
And between the power receiver end or the other end of the secondary coil；
One control end resistance, is coupled between the control end of the pressure limit switch and the earth terminal.
15. wireless power system as claimed in claim 10, it is characterised in that wherein further include a wireless power transmitting terminal,
It is to be formed by a power supply unit, a feeder ear coupled capacitor and a primary winding concatenation, to produce the wireless power
And the wireless power is launched by the primary winding.
16. the wireless power system as any one of claim 10 to 15, it is characterised in that wherein described first switch
And it is N-type effect electric crystal or bipolar npn junction transistors that the second switch, which is,.
17. the wireless power system as any one of claim 10 to 15, it is characterised in that wherein described power management
Unit is the IC to be realized with manufacture of semiconductor.
18. the wireless power system as any one of claim 10 to 15, it is characterised in that wherein described first protection
It is electrochemical capacitor or ceramic condenser that electric capacity and the second protection electric capacity, which are,.
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| CN201310578166.7A CN104659923B (en) | 2013-11-18 | 2013-11-18 | PMU and its wireless power system of application |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310578166.7A CN104659923B (en) | 2013-11-18 | 2013-11-18 | PMU and its wireless power system of application |
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| CN104659923B true CN104659923B (en) | 2017-09-22 |
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| US20180233942A1 (en) * | 2017-02-10 | 2018-08-16 | Apple Inc. | Wireless Charging System With Protection Circuitry |
| CN108808868A (en) * | 2017-05-05 | 2018-11-13 | 国美科技有限公司 | Wireless charging receiver with voltage protection |
| US10958154B2 (en) * | 2017-07-06 | 2021-03-23 | Integrated Device Technology, Inc. | Wireless receiver rectifier low side current limited operation |
| US10483772B2 (en) * | 2017-11-02 | 2019-11-19 | Lear Corporation | System and method for electric vehicle wireless charger output protection |
| TWI692166B (en) | 2018-05-16 | 2020-04-21 | 國立交通大學 | Wireless power system |
| US11075515B2 (en) * | 2018-06-05 | 2021-07-27 | Nuvolta Technologies (Hefei) Co., Ltd. | Overvoltage protection device and method thereof |
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