CN207518301U - A kind of boost type wireless charging receiving circuit - Google Patents
A kind of boost type wireless charging receiving circuit Download PDFInfo
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- CN207518301U CN207518301U CN201721418507.4U CN201721418507U CN207518301U CN 207518301 U CN207518301 U CN 207518301U CN 201721418507 U CN201721418507 U CN 201721418507U CN 207518301 U CN207518301 U CN 207518301U
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Abstract
The utility model is related to a kind of boost type wireless charging receiving circuits, traditional feedback method is not used, but by using the output current of energy storage inductor not with the characteristic that duty ratio and charging time change, in the case of the not up to required voltage of charged battery voltage, it is charged by constant charge current, and in the case of voltage needed for reaching in charged battery voltage, pass through constant-potential charge, the stability of charge control and charging process is improved, realizes boost type wireless charging.
Description
Technical field
The utility model is related to wireless charging field, more particularly to a kind of boost type wireless charging receiving circuit.
Background technology
In order to promote the charge efficiency of charger, the circuit majority of charger is based on DC-DC converter.It is general to have micro USB
Electric appliance can easily use the structure of buck DC-DC, input voltage is converted into needed for lithium battery since input voltage is higher
The voltage wanted, such as 4.2V.However, for wireless charging, due to the limitation of the efficiency and transmission power of wireless transmission, wirelessly
The voltage that charger receives is usually smaller, even less than 4.2V, therefore the structure of buck DC-DC is not applied for wireless charging
Device.Wireless charger is made to obtain higher voltage, it is necessary to using the structure of boost type DC-DC.
Please refer to Fig.1 and Fig. 2, Fig. 1 be existing boost type DC-DC chargers circuit structure diagram, Fig. 2 be Fig. 1 in filling
Electrical equipment control sequence diagram.For charger, constant current mode and constant voltage mode are needed --- first with constant current mode output
Voltage Vout is charged to VREF, then switches to constant voltage mode again.Wherein, for constant current mode, it is desirable to export/charging current perseverance
It is fixed.By Fig. 1 and Fig. 2 it is found that VDC is input voltage.The break-make of S control power tubes MN and MP, and S is by Reset and Set signal groups
Close control --- when Reset is inputted, S 0；When Set is inputted, S 1.And S controls use the control mode of constant frequency, that is, multiple
Position signal Reset is with constant frequencyOccur.When charging current is S=0 (at this point, power tube MN is disconnected, power tube MP
Conducting) flow through the electric current Iout of power tube MP.Charging current Iout generates voltage VSENS, voltage VSENS=1/ by integrator
C1·∫IoutDt, wherein, C1 is integrating capacitor, and the time of integration is Δ TCHG.When VSENS is more than reference voltage VREF (VREF=
1/C1·Iav·ΔTSW, it represents mean charging current and reaches rated value, wherein, Iav is average current) when, generate Set signals.
But the above-mentioned feedback controling mode using constant frequency is unstable, as shown in figure 3, Fig. 3 is existing boosting
Formula DC-DC chargers charge when using constant frequency feedback controling mode there are the problem of schematic diagram.Work as ILIt is small there are one
Disturbance Δ I1 when, this disturbance through feedback will not be suppressed, can become increasing instead, such as Δ I2.
In addition, the existing charge control mode that is utilized as of boost type wireless charging brings new challenge.Referring to Fig. 4,
Fig. 4 is the circuit structure diagram of the boost type wireless charging circuit of the DC-DC charging circuits based on Fig. 1, it follows that existing boosting
Formula wireless charging circuit is differed only in existing boost type DC-DC charging circuits：Add resonance circuit and rectifier
REC.Wherein, resonance circuit can be the connection mode of serial or parallel connection, and rectifier can be full-wave rectifier, half-wave rectifier
With voltage multiplier etc..Capacitance C is passed through in the output of rectifierDCVoltage regulation filtering after, the input as rear class boost type DC-DC.
But referring to Fig. 5, Fig. 5 is the output voltage VDC of the rectifier of the boost type wireless charging circuit in Fig. 4 with duty ratio D
With the analogous diagram of charging time variation.For wired DC-DC boost charges circuit, VDC is fixed input voltage, but for nothing
Line boost type charging circuit, VDC are with duty ratio D (D=(Δ TSW-ΔTCHG)/ΔTSW) and charging time variation.This be by
In the load as wireless charging rectifier, the impedance of the boost type DC-DC rectifiers of rear class also can be with duty ratio and charging
Time change.Remove startup stage, hence it is evident that as can be seen that duty ratio is smaller, the charging time is longer, and VDC is bigger.Therefore, it is traditional
Charge control method based on DC-DC is not particularly suited for boost type wireless charging circuit.
Utility model content
To solve the disadvantage that the above-mentioned prior art and deficiency, the utility model provides a kind of boost type wireless charging and receives
Circuit does not use traditional feedback method, but by using the output current of energy storage inductor not with duty ratio and charging time
The characteristic of variation in the case of the not up to required voltage of charged battery voltage, is charged by constant charge current, and is being charged
In the case that cell voltage reaches required voltage, by constant-potential charge, the stability of charge control and charging process is improved,
Realize boost type wireless charging.
A kind of boost type wireless charging receiving circuit, including resonance circuit, rectifier, the first filter capacitor, energy storage inductor,
N-type metal-oxide-semiconductor, p-type metal-oxide-semiconductor, the second filter capacitor, adder, first comparator, the second comparator, third comparator, first are adopted
Sample capacitance, the first sampling switch, the second sampling switch, the second sampling capacitance, third sampling capacitance, third sampling switch and control
Switch；
The resonance circuit is received by way of magnetic coupling by the energy of external emission circuit transmission, output terminal with
The input terminal electrical connection of the rectifier；
The output terminal of the rectifier is grounded by first filter capacitor, and the output signal of the output terminal of rectifier
It is exported after the first filter capacitor rectifying and wave-filtering to the energy storage inductor；
Institute's energy storage inductor one end is electrically connected with the rectifier output end, the other end drain electrode with the N-type metal-oxide-semiconductor simultaneously
Drain electrode with the p-type metal-oxide-semiconductor is electrically connected；
The source electrode ground connection of the N-type metal-oxide-semiconductor, grid are electrically connected with the grid of the p-type metal-oxide-semiconductor and access square wave control
Signal；
The source electrode of the p-type metal-oxide-semiconductor is grounded by second filter capacitor；
The both ends of second filter capacitor form charging output terminal, for accessing rechargeable battery；
Two input terminals of the adder detect the drain electrode electricity of the drain current for flowing through N-type metal-oxide-semiconductor and p-type metal-oxide-semiconductor respectively
Stream obtains two image currents after scaled down, and adder carries out two image currents addition processing, and generation mutually powers up
Stream, and pass through its output terminal and export；The output terminal of adder is grounded by the first sampling capacitance；
First sampling switch is in parallel with first sampling capacitance, and the first sampling switch is by one first pulse signal
Its break-make is controlled, realizes the first sampling capacitance of short-circuit first sampling capacitance or access；
The second sampling switch both ends are defeated with the reverse phase of the output terminal of the adder and the third comparator respectively
Enter end electrical connection, and the second sampling switch controls its break-make by one second pulse signal；Second pulse signal is than the first arteries and veins
Rush signal delay input；
Described second sampling capacitance one end is electrically connected to the inverting input of the third comparator, other end ground connection；
The in-phase input end of the third comparator accesses a fixed current source, and output terminal exports a third pulse signal,
The third pulse signal controls the break-make of the third sampling switch；
The fixed current source, other end ground connection are accessed in described third sampling switch one end；
The third sampling capacitance is in parallel with the third sampling switch, and it accesses fixed current with third sampling switch
The one end in source is electrically connected with the in-phase input end of the first comparator；
The in-phase input end of second comparator is electrically connected with the source electrode of the p-type metal-oxide-semiconductor, inverting input access one
Reference voltage, output terminal output switch control signal；
The inverting input of the first comparator passes through a capacity earth；The first comparator is by comparing its reverse phase
The input voltage of input terminal and in-phase input end obtains the required square wave control signal, and passes through its output terminal output institute
Square wave control signal is stated, the break-make of the N-type metal-oxide-semiconductor and p-type metal-oxide-semiconductor is controlled, realizes and required perseverance is obtained in constant current mode
Determine charging current；
The control switch is in parallel with the capacitance, and controls its break-make, and the control by the switch control signal
A fixed level is accessed in the one end connected in switch by the capacitance and the inverting input of first comparator；When the switch
When the control signal control control switch is closed, the reverse inter-input-ing ending grounding of first comparator, circuit is in constant voltage mode；When
When the switch control signal control control switch disconnects, the inverting input of first comparator accesses the fixed level, electricity
Road is in constant current mode.
Relative to the prior art, the utility model boost type wireless charging receiving circuit by using energy storage inductor output
Electric current with the characteristic that duty ratio and charging time change, in the case of the not up to required voltage of charged battery voltage, does not pass through
Constant charge current charges, and in the case of voltage needed for reaching in charged battery voltage, by constant-potential charge, raising is filled
Electric control and the stability of charging process realize boost type wireless charging.
Further, during constant current mode, the adder is by obtaining the drain current grade ratios of N-type metal-oxide-semiconductor and p-type metal-oxide-semiconductor
Image current after example diminution, and two image current additions are handled, it generates and is added electric current ISENS, electric current ISENSIt is by the period
TSENSFirst pulse signal charge to the first sampling capacitance C0, one amplitude of generation be ISENS·TSENSThe sawtooth of/C0
Wave VSENS, wherein, TSENS=C0/I0, I0 are the fixed current source, and I0=Iout0/1000, Iout0 are required constant fill
Electric current；Second pulse signal is by controlling the second sampling switch break-make, sampling sawtooth wave VSENSThe electricity of peak
Pressure amplitude degree VE, and be stored on the second sampling capacitance C2, VE=ISENS·TSENS/ C0=(IL/1000)·(C0/I0)/C0
=IL/ Iout0=1/ (1-D0), wherein ILOutflow electric current for energy storage inductor；Meanwhile by the fixed current source I0 to institute
Third sampling capacitance C3 chargings are stated, generate another sawtooth wave VRAMP, wherein, C3=C0/n, n are integer；As the sawtooth wave VRAMP
When reaching VE, compared by third comparator, generate the third pulse signal, of short duration conducting third sampling switch resets
VRAMP, VRAMPCycle TRAMP=VEC3/I0=ISENSTSENS/ C0C3/I0=IL/Iout0/nTSENS=1/ (1-
D0)/n·TSENS；Pass through the first comparator sawtooth wave VRAMPWith the fixed level V0, V0=1V, generation accounts for
Sky realizes the constant charge current Iout0 needed for obtaining than the square wave control signal S for D0；
It is charged by constant charge current Iout0 to rechargeable battery, charged battery voltage rises linearly over time；Work as charging
When cell voltage is more than the reference voltage, by the more current charged battery voltage of the second comparator and the reference voltage,
The switch control signal generated is high level, and the control switch is controlled to be closed, the inverting input of first comparator
Current potential is down to low potential from V0, realizes that the duty ratio of the square wave control signal gradually increases to 100%, the constant charging electricity
It is 0 to flow, and realizes and is converted from constant current mode to constant voltage mode.
Further, the value of Integer n is more than 1.By limiting herein, third sampling capacitance can be reduced, reduce ripple.
Further, the value of Integer n is equal to 4.By limiting herein, third sampling capacitance can be further reduced, reduces line
Wave.
Further, the resonance circuit is LC series resonant circuits.
In order to better understand and implement, the utility model is described in detail below in conjunction with the accompanying drawings.
Description of the drawings
Fig. 1 is the circuit structure diagram of existing boost type DC-DC chargers；
Fig. 2 is the charger control sequential figure in Fig. 1；
Fig. 3 be existing boost type DC-DC chargers charge when using constant frequency feedback controling mode there are the problem of
Schematic diagram；
Fig. 4 is the circuit structure diagram of the boost type wireless charging circuit of the DC-DC charging circuits based on Fig. 1；
Fig. 5 is the output voltage VDC of the rectifier of the boost type wireless charging circuit in Fig. 4 with duty ratio D and charging
The analogous diagram of time change；
Fig. 6 is the oscillogram of the one of which method of square wave control signal that the utility model generates that duty ratio is D0；
Fig. 7 is the oscillogram of another method of square wave control signal that the utility model generates that duty ratio is D0；
Fig. 8 is the circuit diagram of the utility model boost type wireless charging receiving circuit；
Fig. 9 is the working waveform figure of the utility model boost type wireless charging receiving circuit.
Specific embodiment
The defects of to solve the prior art, by the study found that for boost type wireless charger, the output of energy storage inductor
Electric current ILBe one not with the amount that duty ratio and charging time change becauseThat is, ILOnly with the letter of transmitting terminal
Number amplitude VPAAnd L, C of resonance circuit are related to coefficient of coup k.Thus using this characteristic, for required constant charging electricity
Flow Iout0, it is only necessary to find corresponding duty ratio D0.It is therefore not necessary to using traditional feedback method, duty only need to be generated
Than the square wave control signal S for D0, you can obtain the constant charge current Iout0 of needs.
Wherein, to obtain the square wave control signal that duty ratio is D0, it can be realized and obtained by two methods：
The first acquisition methods：Referring to Fig. 6, first, the sawtooth wave that an amplitude is 1 is generated, with the saw that the amplitude is 1
Tooth wave and the signal that amplitude is 1-D0 are compared, and generation a cycle is T, the square-wave signal that duty ratio is D0.
Second of acquisition methods：Referring to Fig. 7, first, generate the signal that an amplitude is 1, and with the amplitude for 1 signal
It is compared with signal of the amplitude for 1/ (1-D0), generation a cycle is T, the square-wave signal that duty ratio is D0.
It follows that in above two method, the amplitude of sawtooth wave is fixed value 1 in first method, at second
It is 1/ (1-D0) in method, is all proportional to IL；And the amplitude of comparative level is 1-D0 in first method, in second method
For fixed value 1, it is all proportional to Iout.For charger, it is desirable to Iout certainly as fixed value, and ILBe with
VPAAnd the relevant variables of k, the relationship of the two are adjusted by D0.Therefore, to reach more stable charge control and preferably filling
Electric effect, the utility model employs the acquisition methods for the square wave control signal that second of duty ratio is D0, specific as follows to state.
Referring to Fig. 8, the utility model provides a kind of boost type wireless charging receiving circuit, including resonance circuit, whole
Flow device REC, the first filter capacitor CDC, energy storage inductor L1, N-type metal-oxide-semiconductor MN, p-type metal-oxide-semiconductor MP, the second filter capacitor C1, addition
Device, first comparator CMP1, the second comparator CMP2, third comparator CMP3, the first sampling capacitance C0, the first sampling switch
S1, the second sampling switch S2, the second sampling capacitance C2, third sampling capacitance C3, third sampling switch S3 and control switch S4.
The resonance circuit is received by way of magnetic coupling by the energy of external emission circuit transmission, output terminal with
The input terminal electrical connection of the rectifier REC.In the present embodiment, the resonance circuit is LC series resonant circuits, by one
A resonant inductance L and resonant capacitance C is formed.One end of the resonant inductance L and the resonant capacitance C mutually concatenate, the other end
Collectively form the output terminal of resonance circuit, output energy to the rectifier REC.
The output terminal of the rectifier REC passes through the first filter capacitor CDCGround connection, and the output terminal of rectifier REC
Output signal passes through the first filter capacitor CDCIt is exported after rectifying and wave-filtering to the energy storage inductor L1.The rectifier REC is all-wave
Rectifier or half-wave rectifier and voltage-doubler rectifier.
Institute energy storage inductor L1 one end is electrically connected with the rectifier REC output terminals, the other end simultaneously with the N-type metal-oxide-semiconductor
The drain electrode of MN and the drain electrode of the p-type metal-oxide-semiconductor MP are electrically connected.
The source electrode ground connection of the N-type metal-oxide-semiconductor MN, grid are electrically connected with the grid of the p-type metal-oxide-semiconductor MP and access a square wave
Control signal S.
The source electrode of the p-type metal-oxide-semiconductor MP is grounded by the second filter capacitor C1.
The both ends of the second filter capacitor C1 form charging output terminal, and for accessing rechargeable battery, rechargeable battery is in electricity
Equivalent capacity in road is CB, terminal voltage Vout.
Two input terminals of the adder detect the leakage of the drain current for flowing through N-type metal-oxide-semiconductor MN and p-type metal-oxide-semiconductor MP respectively
Electrode current obtains two image currents after scaled down, and adder carries out addition processing to two image currents of acquisition, production
It is raw to be added electric current, and pass through its output terminal and export；The output terminal of adder is grounded by the first sampling capacitance C0.In the present embodiment
In, two input terminals of the adder obtain drain current by transistor respectively and reduce the image current after 1000 times, that is,
Two image currents obtained are respectively the 1/1000 of its corresponding drain current.
The first sampling switch S1 is in parallel with the first sampling capacitance C0, and the first sampling switch S1 is by one first arteries and veins
It rushes signal psi 1 and controls its break-make, realize the first sampling capacitance C0 of the first sampling capacitance C0 of short circuit or access.
The second sampling switch S2 both ends respectively with the output terminal of the adder and the third comparator CMP3
Inverting input is electrically connected, and the second sampling switch S2 controls its break-make by one second pulse signal φ 2；The second pulse letter
Number 2 to the first pulse signal φ 1 of φ delay input.In the present embodiment, 2 to the first pulse signal φ 1 of the second pulse signal φ
Postpone an extremely short period.
Described second sampling capacitance C2 one end is electrically connected to the inverting input of the third comparator CMP3, another termination
Ground.
The in-phase input end of the third comparator CMP3 accesses a fixed current source I0, and output terminal exports a third pulse
Signal psi 3, third pulse signal φ 3 control the break-make of the third sampling switch S3.
The fixed current source I0, other end ground connection are accessed in described third sampling switch S3 one end.
The third sampling capacitance C3 is in parallel with the third sampling switch S3, and it is solid with third sampling switch S3 accesses
One end of constant current source I0 is electrically connected with the in-phase input end of the first comparator CMP1.
The in-phase input end of the second comparator CMP2 is electrically connected with the source electrode of the p-type metal-oxide-semiconductor MP, inverting input
Access a reference voltage VREF, output terminal output switch control signal VM.
The inverting input of the first comparator CMP1 is grounded by a capacitance C4；The first comparator CMP1 passes through
Compare the input voltage of its inverting input and in-phase input end, obtain the required square wave control signal S, and it is defeated to pass through its
Outlet exports the square wave control signal S, controls the break-make of the N-type metal-oxide-semiconductor MN and p-type metal-oxide-semiconductor MP, realizes in constant current mode
Constant charge current Iout0 needed for middle acquisition.
The control switch S4 is in parallel with the capacitance, and controls its break-make by the switch control signal VM.It is and described
Electricity is fixed in one end access one being connect in control switch S4 by the capacitance C4 with the inverting input of first comparator CMP1
Flat V0；When the switch control signal VM controls control switch S4 is closed, the inverting input of first comparator CMP1
Ground connection, circuit are in constant voltage mode；When the switch control signal VM controls control switch S4 is disconnected, first comparator CMP1
Inverting input access the fixed level V0, circuit is in constant current mode.
Please refer to Fig. 9, in constant current mode, to generate the sawtooth wave of 1/ (1-D0) amplitude, the adder is by obtaining
The image current after the drain current scaled down of N-type metal-oxide-semiconductor MN and p-type metal-oxide-semiconductor MP is taken, each image current of acquisition is
The 1/1000 of its corresponding drain current, and two image current additions are handled, it generates and is added electric current ISENS, ISENS=IL/
1000, electric current ISENSIt is T by the periodSENSThe first pulse signal φ 1 charge to the first sampling capacitance C0, generate
One amplitude is ISENS·TSENSThe sawtooth wave V of/C0SENS, wherein, TSENS=C0/I0, I0 be the fixed current source, I0=
Iout0/1000, Iout0 are required constant charge current；The second pulse signal φ 2 is by controlling second sampling
Switch S2 break-makes, sampling sawtooth wave VSENSThe voltage amplitude VE of peak, and be stored on the second sampling capacitance C2, VE=
ISENS·TSENS/ C0=(IL/ 1000) (C0/I0)/C0=IL/ Iout0=1/ (1-D0), wherein ILStream for energy storage inductor L1
Go out electric current；Meanwhile charged by the fixed current source I0 to the third sampling capacitance C3, generate another sawtooth wave VRAMP,
Wherein, C3=C0/n, n are integer；As the sawtooth wave VRAMPWhen reaching VE, compared by third comparator CMP3, generate institute
Third pulse signal φ 3, of short duration conducting third sampling switch S3 are stated, resets VRAMP, VRAMPCycle TRAMP=VEC3/I0=
ISENS·TSENS/ C0C3/I0=IL/Iout0/nTSENS=1/ (1-D0)/nTSENS；Pass through the first comparator
The CMP1 sawtooth wave VRAMPWith fixed level V0, the V0=1V, the square wave control letter that duty ratio is D0 is generated
Number S, and the N-type metal-oxide-semiconductor and p-type metal-oxide-semiconductor are controlled using square wave control signal S, you can that realizes needed for obtaining constant fills
Electric current Iout0.At this point, the output current Iout=Iout0 of the source electrode of p-type metal-oxide-semiconductor.
It is charged by constant charge current Iout0 to rechargeable battery, charged battery voltage Vout rises linearly over time；When
When charged battery voltage Vout is more than the reference voltage VREF, pass through the second more current charged battery voltages of comparator CMP2
The Vout and reference voltage VREF, the switch control signal VM of generation is high level, and the control switch S4 is controlled to close
It closes, the current potential of the inverting input of first comparator CMP1 is down to low potential from V0, realizes the duty of the square wave control signal S
Than gradually increasing to 100%, the constant charge current Iout0 is 0, realizes and is converted from constant current mode to constant voltage mode.
To reduce ripple, reduce third sampling capacitance C3, it is preferable that the value of Integer n is more than 1.And in the present embodiment,
The value of Integer n is equal to 4.
Relative to the prior art, the utility model boost type wireless charging receiving circuit does not use traditional feedback method,
But by using the output current of energy storage inductor not with the characteristic that duty ratio and charging time change, in charged battery voltage not
In the case of voltage needed for reaching, charged by constant charge current, and the situation of voltage needed for reaching in charged battery voltage
Under, by constant-potential charge, the stability of charge control and charging process is improved, realizes boost type wireless charging.
Embodiment described above only expresses the several embodiments of the utility model, and description is more specific and detailed,
But therefore it can not be interpreted as the limitation to utility model patent range.It should be pointed out that the common skill for this field
For art personnel, without departing from the concept of the premise utility, various modifications and improvements can be made, these are belonged to
The scope of protection of the utility model.
Claims (5)
1. a kind of boost type wireless charging receiving circuit, it is characterised in that：Including resonance circuit, rectifier, the first filter capacitor,
Energy storage inductor, N-type metal-oxide-semiconductor, p-type metal-oxide-semiconductor, the second filter capacitor, adder, first comparator, the second comparator, third compare
Device, the first sampling capacitance, the first sampling switch, the second sampling switch, the second sampling capacitance, third sampling capacitance, third sampling
Switch and control switch；
The resonance circuit is received by way of magnetic coupling by the energy of external emission circuit transmission, output terminal with it is described
The input terminal electrical connection of rectifier；
The output terminal of the rectifier is grounded by first filter capacitor, and the output signal of the output terminal of rectifier is passed through
It is exported after first filter capacitor rectifying and wave-filtering to the energy storage inductor；
Institute's energy storage inductor one end is electrically connected with the rectifier output end, other end drain electrode with the N-type metal-oxide-semiconductor simultaneously and institute
State the drain electrode electrical connection of p-type metal-oxide-semiconductor；
The source electrode ground connection of the N-type metal-oxide-semiconductor, grid are electrically connected with the grid of the p-type metal-oxide-semiconductor and access square wave control letter
Number；
The source electrode of the p-type metal-oxide-semiconductor is grounded by second filter capacitor；
The both ends of second filter capacitor form charging output terminal, for accessing rechargeable battery；
Two input terminals of the adder flow through the drain current of N-type metal-oxide-semiconductor and the drain electrode electricity of p-type metal-oxide-semiconductor by detecting respectively
Stream obtains two image currents after scaled down, and adder carries out two image currents addition processing, and generation mutually powers up
Stream, and pass through its output terminal and export；The output terminal of adder is grounded by the first sampling capacitance；
First sampling switch is in parallel with first sampling capacitance, and the first sampling switch is controlled by one first pulse signal
Its break-make realizes the first sampling capacitance of short-circuit first sampling capacitance or access；
The second sampling switch both ends respectively with the output terminal of the adder and the inverting input of the third comparator
Electrical connection, and the second sampling switch controls its break-make by one second pulse signal；Second pulse signal is believed than the first pulse
Number delay input；
Described second sampling capacitance one end is electrically connected to the inverting input of the third comparator, other end ground connection；
The in-phase input end of the third comparator accesses a fixed current source, and output terminal exports a third pulse signal, this
Three pulse signals control the break-make of the third sampling switch；
The fixed current source, other end ground connection are accessed in described third sampling switch one end；
The third sampling capacitance is in parallel with the third sampling switch, and itself and third sampling switch access fixed current source
One end is electrically connected with the in-phase input end of the first comparator；
The in-phase input end of second comparator is electrically connected with the source electrode of the p-type metal-oxide-semiconductor, one reference of inverting input access
Voltage, output terminal output switch control signal；
The inverting input of the first comparator passes through a capacity earth；The first comparator is by comparing its anti-phase input
End and the input voltage of in-phase input end, obtain the required square wave control signal, and pass through its output terminal and export the side
Wave control signal controls the break-make of the N-type metal-oxide-semiconductor and p-type metal-oxide-semiconductor, realizes and required constant fill is obtained in constant current mode
Electric current；
The control switch is in parallel with the capacitance, and controls its break-make, and the control switch by the switch control signal
In pass through one end that the capacitance and the inverting input of first comparator connect and access a fixed level；When the switch control
When the signal control control switch is closed, the reverse inter-input-ing ending grounding of first comparator, circuit is in constant voltage mode；Work as switch
When controlling the signal control control switch to disconnect, the inverting input of first comparator accesses the fixed level, at circuit
In constant current mode.
2. boost type wireless charging receiving circuit according to claim 1, it is characterised in that：
During constant current mode, the mirror after drain current scaled down of the adder by obtaining N-type metal-oxide-semiconductor and p-type metal-oxide-semiconductor
Image current, and two image current additions are handled, it generates and is added electric current ISENS, electric current ISENSIt is T by the periodSENSDescribed
One pulse signal charges to the first sampling capacitance C0, and one amplitude of generation is ISENS·TSENSThe sawtooth wave V of/C0SENS, wherein,
TSENS=C0/I0, I0 are the fixed current source, and I0=Iout0/1000, Iout0 are required constant charge current；It is described
Second pulse signal is by controlling the second sampling switch break-make, sampling sawtooth wave VSENSThe voltage amplitude VE of peak, and
It is stored on the second sampling capacitance C2, VE=ISENS·TSENS/ C0=(IL/ 1000) (C0/I0)/C0=IL/Iout0
=1/ (1-D0), wherein ILOutput current for energy storage inductor；Meanwhile the third is sampled by the fixed current source I0
Capacitance C3 charges, and generates another sawtooth wave VRAMP, wherein, C3=C0/n, n are integer；As the sawtooth wave VRAMPWhen reaching VE,
Compared by third comparator, generate the third pulse signal, of short duration conducting third sampling switch resets VRAMP, VRAMPWeek
Phase TRAMP=VEC3/I0=ISENSTSENS/ C0C3/I0=IL/Iout0/nTSENS=1/ (1-D0)/nTSENS；
Pass through the first comparator sawtooth wave VRAMPWith fixed level V0, the V0=1V, it is D0's to generate duty ratio
The square wave control signal S realizes the constant charge current Iout0 needed for obtaining；
It is charged by constant charge current Iout0 to rechargeable battery, charged battery voltage rises linearly over time；Work as rechargeable battery
When voltage is more than the reference voltage, by the more current charged battery voltage of the second comparator and the reference voltage, generate
The switch control signal for high level, the control switch is controlled to be closed, the current potential of the inverting input of first comparator
Low potential is down to from V0, realizes that the duty ratio of the square wave control signal gradually increases to 100%, the constant charge current is
0, it realizes and is converted from constant current mode to constant voltage mode.
3. boost type wireless charging receiving circuit according to claim 2, it is characterised in that：The value of Integer n is more than 1.
4. boost type wireless charging receiving circuit according to claim 3, it is characterised in that：The value of Integer n is equal to 4.
5. boost type wireless charging receiving circuit according to claim 1, it is characterised in that：The resonance circuit is gone here and there for LC
Join resonance circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721418507.4U CN207518301U (en) | 2017-10-30 | 2017-10-30 | A kind of boost type wireless charging receiving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721418507.4U CN207518301U (en) | 2017-10-30 | 2017-10-30 | A kind of boost type wireless charging receiving circuit |
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| Publication Number | Publication Date |
|---|---|
| CN207518301U true CN207518301U (en) | 2018-06-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721418507.4U Expired - Fee Related CN207518301U (en) | 2017-10-30 | 2017-10-30 | A kind of boost type wireless charging receiving circuit |
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| Country | Link |
|---|---|
| CN (1) | CN207518301U (en) |
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2017
- 2017-10-30 CN CN201721418507.4U patent/CN207518301U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180619 Termination date: 20181030 |