CN109103972A - Wireless power source transmitting line and its control method - Google Patents
Wireless power source transmitting line and its control method Download PDFInfo
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- CN109103972A CN109103972A CN201810300570.0A CN201810300570A CN109103972A CN 109103972 A CN109103972 A CN 109103972A CN 201810300570 A CN201810300570 A CN 201810300570A CN 109103972 A CN109103972 A CN 109103972A
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Classifications
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- H02J7/025—
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- H02J5/005—
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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
- H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
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Abstract
The present invention proposes a kind of wireless power source transmitting line and its control method.Wireless power source transmitting line includes power-switching circuit, a power inverter circuit, LC circuit, resonance transmitting line and control circuit.Wherein, LC circuit, including inductance and capacitor, the wherein reactance of LC circuit substantially zero.LC circuit is to be converted to coil current for ac output current.Resonance transmitting line includes at least a transmit coil and variable capacitance circuit, and wherein coil current flows through an at least transmit coil, inductance capacitance power supply is converted to resonant radio source.Control circuit, to adjust the impedance of variable capacitance circuit, makes resonance transmitting line be generally operating in impedance matching situation to generate capacitor adjustment signal.
Description
Technical field
The present invention relates to a kind of wireless power source transmitting lines, and resonance transmitting line therein can be made substantially by particularly relating to one kind
On operate in the wireless power source transmitting line of impedance matching (impedance matched) situation.The present invention also relates to be used for nothing
The control method of line power supply transmitting line.
Background technique
In general wireless power source transmit circuit is used for wireless charging application, need to have constant current (constant
Current) control function, and in power input or excessively high output, and firm power (constant power) need to be converted to
Control model, to avoid damage wireless power source transmit circuit or late-class circuit.Fig. 1 shows a kind of wireless power source of prior art
Transmitting line (wireless power source transmitting line 1), wireless power source transmitting line 1 include a decompression converting circuit, a power converter
Circuit (power inverter circuit), a resonance transmitting line 11 and a resonant matching circuit 12.Wherein resonance electricity
Stream IRS is determined according to the level of the input voltage VS of power inverter circuit.Power supply transmitting line 1 is wireless to generate resonance
Power supply Pwlrs, so that inductive charging power supply gives charging circuit 13.
The prior art shown in Fig. 1, its shortcoming is that needing relatively high input voltage level, relatively large electricity
Pressure control range and very high-resolution digital analog converter (it is not shown, it is inverse with electric power to control decompression converting circuit
Become device circuit), it can be only achieved that resonance current IRS is controlled in constant current or resonant radio source Pwlrs is controlled in constant function
The demand of rate.Resonance transmitting line 11 includes inductance Lp and capacitor Cp and reflected umpedance Zeq.Wherein, reflected umpedance Zeq is
An equivalent impedance in resonance transmitting line 11, also 13 placement location of charging circuit by receiving end is influenced and is changed
Become, this is well known to those skilled in the art, and it will not be described here.
The prior art shown in Fig. 1, its shortcoming is that, since resonance transmitting line 11 converts the exchange out-put supply
It is resonant radio source Pwlrs to realize that wireless power source is sent, with charging circuit 13 (such as rechargeable battery or the hand to receiving end
Machine) charging.Due in actual application, when the relative position difference of charging circuit 13 and resonance transmitting line 11, resonance hair
The reflected umpedance Zeq on power transmission road 11 can thus it is different, which results in power losses.As shown in Fig. 2, reflected umpedance Zeq includes real
The reflected resistance Req in the portion and reflected reactance Xeq of imaginary part.Fig. 2 is shown, when the charging equipment and resonance transmitting line 11 of receiving end
Relative position difference when, reflected umpedance Zeq can be changed.Wherein, reflected umpedance Zeq contains reflected resistance Req and reflection electricity
Anti- Xeq.The case where reflected reactance Xeq is bigger, resonance 11 impedance mismatch of transmitting line is more serious, resonant radio source Pwlrs
Power loss it is bigger.If maintaining constant current or firm power, need to input higher voltage and higher power.Such as
Shown in Fig. 3, when the imaginary part reflected reactance Xeq of reflected umpedance Zeq is bigger, the pressure drop on required inductance Lp is higher, ability
Reach identical inductive current.
This is in view of this, it is an object of the present invention to the shortcomings that being directed to the above-mentioned prior art and deficiency, propose a kind of wireless
Power supply transmitting line and its control method can solve aforementioned problem of the prior art, reduce the power damage in resonant radio source
It loses, and realizes constant-current mode or constant power-mode.
Summary of the invention
In order to achieve the above-mentioned object of the invention, one of viewpoint is sayed, the present invention provides a kind of wireless power sources to send electricity
Road, which includes: a power-switching circuit (power converter circuit), to convert one
Input voltage and generate a conversion output voltage；One power inverter circuit (power inverter circuit), to root
Switch wherein at least one switch according to an operation signal, which converted and generates an ac output voltage,
And an ac output current is supplied, an output AC power is generated whereby；One inductance capacitance (LC) circuit, with the power converter
Circuit coupling, the lc circuit include an inductance and a capacitor, the wherein reactance (reactance) substantially zero of the lc circuit,
The lc circuit is to be converted to a coil current for the ac output current；One resonance transmitting line sends line comprising at least one
Circle and a variable capacitance circuit, wherein the coil current flows through an at least transmit coil, and generates a resonant radio source；With
And a control circuit, to generate the operation signal and a capacitor adjustment signal, wherein the capacitor adjustment signal is to adjust this
The impedance of variable capacitance circuit makes the resonance transmitting line be generally operating in an impedance matching (impedance matched)
Situation.
In a preferred embodiment, which controls the power-switching circuit, and/or adjusts the operation signal and control
The power inverter circuit is made, it is pre- which is maintained at one when the output AC power is lower than a predetermined power
If fixed coil electric current, and when the output AC power is not less than the predetermined power, which is maintained at this
Predetermined power.
In a preferred embodiment, the control circuit is according to the operation signal and/or the coil current, and generates the capacitor
Adjustment signal makes the coil current be maintained at a first area minimum value (local to adjust the impedance of the variable capacitance circuit
minimum)。
In a preferred embodiment, the control circuit is according to the ac output current, and generates the capacitor adjustment signal, with
The impedance for adjusting the variable capacitance circuit makes the ac output current be maintained at a second area minimum value (local
minimum)。
In a preferred embodiment, the control circuit is according to a capacitor cross-pressure of the capacitor in the lc circuit, and generating should
Capacitor adjustment signal makes the capacitor cross-pressure be maintained at a third region minimum value to adjust the impedance of the variable capacitance circuit
(local minimum)。
In a preferred embodiment, the control circuit adjusts the operating frequency and/or a work ratio of the operation signal,
To control the power inverter circuit, when the output AC power is not higher than the predetermined power, which to be maintained
Fixed coil electric current is preset in this, and when the output AC power is higher than the predetermined power, which is maintained
In the default fixed output power.
In a preferred embodiment, which is a half-bridge or full-bridge D class inverter circuit (class D
Inverter circuit), an E class inverter circuit (class E inverter circuit) or a differential mode
(differential mode) E class inverter circuit (class E inverter circuit).
In a preferred embodiment, which is a suitching type decompression converting circuit (buck converter
Circuit) or a suitching type voltage up converting circuit (boost converter circuit) or a suitching type buck conversion
Circuit (buck-boost converter circuit) or an AC-DC conversion circuit (AC-DC converter
circuit)。
In a preferred embodiment, the wherein inductance in the lc circuit and the capacitor, with one electricity of transmit coil composition
Feel capacitor and inductor resonance inverter (LCL-resonant inverter) circuit.
Another viewpoint is sayed that present invention provides a kind of control method of wireless power source transmitting line, the radio
To send a resonant radio source, the control method of the wireless power source transmitting line includes source transmitting line: one input of conversion
Voltage and generate a conversion output voltage；Switch at least one switch according to an operation signal, which is turned
It changes and generates an ac output voltage, and supply an ac output current, generate an output AC power whereby；One inductance is provided
Capacitor (LC) circuit, including an inductance and a capacitor, the wherein reactance (reactance) substantially zero of the lc circuit, the LC
Circuit is to be converted to a coil current for the ac output current；By the way that the coil current is flowed through at least one transmission line
Circle, is converted to the resonant radio source for the LC power supply；And a capacitor adjustment signal is generated, to adjust a variable capacitance
The impedance of circuit makes the resonance transmitting line be generally operating in an impedance matching (impedance matched) situation.
In a preferred embodiment, when the output AC power is lower than a predetermined power, the conversion output voltage is adjusted
Or the ac output voltage, which is maintained at a default fixed coil electric current, and not in the output AC power
When lower than the predetermined power, the conversion output voltage or the ac output voltage are adjusted, which is maintained at
The predetermined power.
In a preferred embodiment, which makes to adjust the impedance of the variable capacitance circuit
The resonance transmitting line be generally operating in a step of impedance matching (impedance matched) situation include: according to should
Operation signal and/or the coil current, and the capacitor adjustment signal is generated, to adjust the impedance of the variable capacitance circuit, make this
Coil current is maintained at a first area minimum value (local minimum).
In a preferred embodiment, which makes to adjust the impedance of the variable capacitance circuit
The resonance transmitting line be generally operating in a step of impedance matching (impedance matched) situation include: according to should
Ac output current, and the capacitor adjustment signal is generated, to adjust the impedance of the variable capacitance circuit, make the ac output current
It is maintained at a second area minimum value (local minimum).
In a preferred embodiment, which makes to adjust the impedance of the variable capacitance circuit
The resonance transmitting line be generally operating in a step of impedance matching (impedance matched) situation include: according to should
A capacitor cross-pressure of the capacitor in lc circuit, and the capacitor adjustment signal is generated, to adjust the impedance of the variable capacitance circuit, make
The capacitor cross-pressure is maintained at a third region minimum value (local minimum).
In a preferred embodiment, the control method of wireless power source transmitting line also includes: adjusting the one of the operation signal
Operating frequency and/or a work ratio, when the output AC power is not higher than the predetermined power, which to be maintained at
The default fixed coil electric current, and when the output AC power is higher than the predetermined power, which is maintained at
The default fixed output power.
Below by way of specific embodiment elaborate, when be easier to understand the purpose of the present invention, technology contents, feature and its
The effect of realized.
Detailed description of the invention
Fig. 1 shows a kind of schematic diagram of the wireless power source transmitting line of prior art；
Fig. 2 is shown in the prior art, when the relative position difference of the charging equipment of receiving end and resonance transmitting line 11,
The reflected umpedance Zeq of resonance transmitting line 11 can be changed；
Fig. 3 shows that pressure drop on required inductance Lp is got over when the imaginary part reflected reactance Xeq of reflected umpedance Zeq is bigger
It is high；
Fig. 4 shows the schematic diagram of an embodiment of wireless power source transmitting line of the invention；
Fig. 5 A-5D shows the signal waveforms corresponding to Fig. 4 embodiment；
Fig. 6 shows in wireless power source transmitting line of the invention, the schematic diagram of an embodiment of resonance transmitting line；
Fig. 7 shows the schematic diagram of an embodiment of wireless power source transmitting line of the invention；
Fig. 8 shows in wireless power source transmitting line of the invention, the schematic diagram of an embodiment of control circuit；
Fig. 9 shows the schematic diagram of an embodiment of wireless power source transmitting line of the invention；
Figure 10 shows the schematic diagram of an embodiment of wireless power source transmitting line of the invention.
Specific embodiment
Referring to Fig. 4, for an embodiment of wireless power source transmitting line of the invention, (wireless power source sends electricity as shown in the figure
Road 2) schematic diagram, wireless power source transmitting line 2 includes a power-switching circuit 20 (power converter circuit), one
Power inverter circuit 30 (power inverter circuit), an inductance capacitance (LC) circuit 40, a resonance transmitting line
50 and a control circuit 60.Wherein power-switching circuit 20 generates conversion output electricity to convert an input voltage vin
Press Vdco.Input voltage vin can be an alternating voltage or a DC voltage, and power-switching circuit 20 can then correspond to one respectively
AC-DC conversion circuit or one direct current-DC converting circuit.Power inverter circuit 30 to according to an operation signal OP and
Switch a wherein at least switch S1, output voltage Vdco conversion will be converted and generate an ac output voltage Vaco, and supplied
One ac output current Iaco generates an output AC power Paco whereby.Inductance capacitance (LC) circuit 40 and power converter
Circuit 30 couples.Lc circuit 40 includes that an at least inductance (is not shown, in rear detailed description) with a capacitor, wherein the electricity of lc circuit 40
Anti- (reactance) substantially zero.Lc circuit 40 is to be converted to a coil current Icoil for ac output current Iaco.
Resonance transmitting line 50 includes an at least transmit coil L and a variable capacitance circuit 51, and wherein coil current Icoil flows through this extremely
A few transmit coil L, and generate a resonant radio source Pwlrs.In the present embodiment, resonance transmitting line 50 includes mutually to be connected in series
Transmit coil L and resonant capacitance circuit 51 and reflected umpedance Zeq.It should be noted that resonance transmitting line 50 and unlimited
In the circuit structure of the present embodiment, can also resonance circuit otherwise implement, such as, but not limited to parallel or series connection
With the resonance circuit of parallel combination.Control circuit 60 is to generate operation signal OP and a capacitor adjustment signal ADJ, wherein capacitor
Impedance of the adjustment signal ADJ to adjust variable capacitance circuit 51, makes resonance transmitting line 50 be generally operating in an impedance
With (impedance matched) situation.So-called impedance matching situation refers to impedance (resistance power-up is anti-) in the biography of AC power source
During defeated, transmit coil L can completely be reached by reaching AC power source, be reflected back lc circuit 40 without having AC power source, thus
Promote power supply conversion efficiency；Impedance matching situation is well known to those skilled in the art, and it will not be described here.
Please continue to refer to Fig. 4, in the present embodiment, variable capacitance circuit 51 includes a variable condenser (varactor) Cvd,
Wherein capacitor adjustment signal ADJ is an analog signal and the control terminal for being coupled to variable condenser Cvd, to simulate and continuously
Ground controls the impedance of variable condenser Cvd, aforementioned resonance transmitting line 50 is made to be generally operating in impedance matching shape to realize
Condition；Wherein the variable condenser (varactor) can be a kind of voltage controlled variable capacitor (such as voltage controlled variable
Di-cap, varactor diode), by applying different reverses biased (reverse bias voltage) to it,
Its capacitance can be changed.It should be noted that capacitor adjustment signal ADJ by a bias resistance Rb is coupled to this in the present embodiment
The control terminal of variable condenser Cvd, and in one embodiment, bias resistance Rb can be omitted.
Please continue to refer to Fig. 4, and simultaneously refering to Fig. 5 A-5D, in one embodiment, control circuit 50 controls power supply conversion electricity
Road 20, and/or adjust operation signal OP and control power inverter circuit 30, with default lower than one in output AC power Paco
When power P prd, coil current Icoil is maintained at a default fixed coil electric current Icnst, and not low in output AC power
When predetermined power Pprd, output AC power Paco is maintained at predetermined power Pprd.Wherein control circuit 50 can be with
Output AC power Paco is obtained according to signal relevant to ac output current Iaco and ac output voltage Vaco.Control
Signal CTRL is generally maintained at predetermined power to control power-switching circuit 20, to adjust output AC power Paco
Pprd, to realize constant power-mode.Wherein described " default " power P prd can be a fixed value, or be one it is adjustable can
Change value, similarly hereinafter.Furthermore it should be noted that: because matching mutual between itself or part of circuit component is not necessarily ideal,
Therefore, although output AC power Paco to be made is maintained at predetermined power Pprd, the output AC power Paco actually generated
Level may not be accurate predetermined power Pprd, and be only that this is i.e. above-mentioned " generally to tie up close to predetermined power Pprd
It is held in " meaning of predetermined power Pprd, similarly hereinafter.
It should be noted that as shown in figs. 5 a-5d, when reflected resistance Req is resistance Req1, output AC power Paco is
Predetermined power Pprd.Ac output voltage Vaco amplitude, with coil current Icoil substantially proportional relation.Exchange output electricity
Stream Iaco and reflected resistance Req has positive relationship.
Wireless power source transmitting line of the invention, difference according to actual needs, such as, but not limited to input voltage vin
The range of voltage range and output AC power Paco, in multiple and different embodiments, power-switching circuit 20 can be all
Change formula decompression converting circuit (buck converter circuit) or a suitching type voltage up converting circuit (boost
Converter circuit) or suitching type lifting voltage conversion circuit (buck-boost converter circuit), and
Input voltage vin is done into decompression conversion or boost conversion respectively or buck is converted and generation conversion output voltage Vdco.?
In one embodiment, power-switching circuit 20 can be an AC-DC conversion circuit (AC-DC converter circuit), will
The input voltage vin of form of communication does AC-DC conversion.
Wireless power source transmitting line of the invention, difference according to actual needs, in multiple and different embodiments, electric power is inverse
Becoming device circuit 30 can be a D class inverter circuit (class D inverter circuit), an E class inverter circuit (class
E inverter circuit) or a differential mode (differential mode) E class inverter circuit (class E inverter
circuit)。
Referring to Fig. 6, in one embodiment, resonance transmitting line 50 ' (such as resonance transmitting line 50 corresponding to Fig. 4)
Variable capacitance circuit 51 ' may include the capacitor being coupled against each other and a capacitor switching switch (in such as, but not limited to Fig. 6
The capacitor Cvs and capacitor of coupled in parallel switch switch SV), in the case, capacitor adjustment signal ADJ controls the capacitor and cuts
The switching of switch SV is changed, to control the reflected umpedance Zeq of the variable capacitance circuit 51 ' and resonance transmitting line 50 ', makes resonance
Transmitting line 50 ' is generally operating in impedance matching situation.
Referring to Fig. 7, showing an embodiment (the wireless power source transmitting line of wireless power source transmitting line of the invention in figure
3) schematic diagram, the power inverter circuit of wireless power source transmitting line 3 are a full-bridge type D class inverter circuit (inverter electricity
Road 30 ') comprising four switching elements (such as switching switch S1, S2, S3 and S4 in figure), to have an operating frequency (example
Such as 6.78MHz) operation signal OP switching, will convert output voltage Vdco convert and generate ac output voltage Vaco.LC
Circuit 40 includes an an inductance L1 and capacitor C1.Capacitor C1 has capacitor cross-pressure Vc1.In a kind of preferred embodiment, LC electricity
Inductance L1 and capacitor C1 in road 40 form inductance capacitance inductance resonance (LCL-resonant) circuit with transmit coil L, with
Make wireless power source transmitting line 3 when resonance frequency operation, a stable electric current is provided, and the current source stable as one.
Similarly, control circuit 60 generates capacitor adjustment signal ADJ according to operation signal OP and/or coil current Icoil, to control
The impedance of the variable capacitance circuit 51 is made, to control the reflected umpedance of the variable capacitance circuit 51 and resonance transmitting line 50
Zeq makes coil current Icoil be maintained at a first area minimum value (local minimum), keeps resonance transmitting line 50 big
Impedance matching situation is operated in cause.Its operation spirit is similar with the embodiment of Fig. 4, and it will not be described here.Wherein, control circuit
60 generate capacitor adjustment than (duty ratio) according to the such as, but not limited to frequency, phase of operation signal OP and/or work
Signal ADJ.
In addition, in one embodiment, in wireless power source transmitting line of the invention, power inverter circuit can be optional for one
Formula (selectable) power inverter circuit, for example, please continue to refer to Fig. 7, in one embodiment, such as relatively
Low-power in application, the switching switch S4 of controllable inverter circuit 30 ' is permanent conducting, and control switching switch S3 as perseverance not
Conducting, make inverter circuit 30 ' have in semibridge system D class inverter circuit operation mode (it is, only S1 and S2 continue with
Operating frequency switching), it can so save power loss.
Referring to Fig. 8, in one embodiment, control circuit 60 ' (such as control circuit 60 corresponding to Fig. 4) includes an electricity
Flow signal processing circuit 61 and a signal conversion circuit 62；Wherein current signal processing circuit 61 is according to current reference signal
IREF and coil current Icoil and generate a difference signal VDF；Signal conversion circuit 62 is then produced according to difference signal VDF
Raw capacitor adjustment signal ADJ, to control the impedance of variable capacitance circuit 51, so that resonance transmitting line 50 is generally operating in
Impedance matching situation.Wherein the details of current signal processing circuit 61 and signal conversion circuit 62 will be described as rear.
Please continue to refer to Fig. 8, in one embodiment, current signal processing circuit 61 include a peak sensing circuit 611 with
And one transduction amplifying circuit 612 (transconductance amplifier circuit)；611 detection lines of peak sensing circuit
The peak value of loop current Icoil and generate a current peak signal VP；Transduce amplifying circuit 512 according to current peak signal VP with
And reference current signal IREF and generate difference signal VDF；Signal conversion circuit 62 then include an integral filter circuit 621 and
One buffer amplifier circuit 622；Wherein difference signal VDF integral filtering is generated filtered circuit letter by integral filter circuit 621
Number VF；Filtered current signal VF Hyblid Buffer Amplifier is then generated capacitor adjustment signal ADJ by buffer amplifier circuit 622, in this implementation
In example, capacitor adjustment signal ADJ can be an impedance control bias (impedance control bias voltage), to logical
It crosses the control terminal of control example variable condenser Cvd as the aforementioned and simulates and continuously control the impedance of variable condenser Cvd, and
And then the impedance of variable capacitance circuit 31 is controlled, aforementioned resonance transmitting line 50 is made to be generally operating in impedance matching shape to realize
Condition.
Referring to Fig. 9, showing an embodiment (the wireless power source transmitting line of wireless power source transmitting line of the invention in figure
4) schematic diagram, the power inverter circuit of wireless power source transmitting line 4 are full-bridge type D class inverter circuit (inverter circuit
30 ') comprising four switching elements (such as switching switch S1, S2, S3 and S4 in figure), with have an operating frequency (such as
Operation signal OP switching 6.78MHz), will convert output voltage Vdco conversion and generate ac output voltage Vaco.It is similar
Ground, control circuit 60 generate capacitor adjustment signal ADJ according to ac output current Iaco, to control the variable capacitance circuit
51 impedance makes exchange output electricity to control the reflected umpedance Zeq of the variable capacitance circuit 51 and resonance transmitting line 50
Stream Iaco is maintained at a second area minimum value (local minimum), and resonance transmitting line 50 is made to be generally operating in resistance
Anti- matching state.Its operation spirit is similar with the embodiment of Fig. 4, and it will not be described here.
Referring to Fig. 10, showing an embodiment (the wireless power source transmission electricity of wireless power source transmitting line of the invention in figure
Road 5) schematic diagram.Similarly, control circuit 60 generates capacitor according to the capacitor cross-pressure Vc1 for being relevant to capacitor in lc circuit 40
Adjustment signal ADJ is sent to control the impedance of the variable capacitance circuit 51 with controlling the variable capacitance circuit 51 and resonance
The reflected umpedance Zeq of circuit 50 makes the capacitor cross-pressure Vc1 for being relevant to the capacitor in lc circuit 40 be maintained at third region minimum
It is worth (local minimum), and resonance transmitting line 50 is made to be generally operating in impedance matching situation.It operates spirit and Fig. 4
Embodiment it is similar, it will not be described here.It should be noted that the so-called capacitor cross-pressure Vc1 for making the capacitor in lc circuit 40 is maintained
In a third region minimum value, refers to by adjusting reflected umpedance Zeq, capacitor cross-pressure Vc1 is made to remain mathematically defined
Region minimum value (or being local minimum), this region minimum value (or being local minimum) is those skilled in the art institute
Known, it will not be described here.First area minimum value above-mentioned and second area minimum value, also the rest may be inferred, and it will not go into details.
Illustrate the present invention, but as described above for preferred embodiment above, only makes those skilled in the art easy
In the understanding contents of the present invention, interest field not for the purpose of limiting the invention.Illustrated each embodiment, however it is not limited to single
Solely application, can also be with combined application；Lifting wherein an example, " constant-current mode " and " constant power-mode " can be used together, and make nothing
Line power supply transmitting line is operable in this two kinds of different modes, makes wireless power source transmitting line under different demands, is operable in
This two kinds of different modes；In the case where above-mentioned be used in combination, panel drive circuit may include the physical circuit of previous embodiment, with reality
The combination of existing above-mentioned mode.In addition, under same spirit of the invention, it may occur to persons skilled in the art that various equivalence changes
And various combinations, for example, in the aforementioned embodiment such as Fig. 8, with current type circuit (such as, but not limited to transduction amplification electricity
Road 612 etc.) for, right spirit according to the present invention can also be used voltage-type circuit and realize identical function.In another example this
Alleged by invention " according to certain signal carry out processing operation or generate certain output result ", be not limited to according to the signal itself,
Comprising when necessary, which being carried out Voltage to current transducer, Current Voltage conversion and/or ratio conversion etc., basis turns later
Signal after changing carries out processing or operation generates certain output result.It follows that under same spirit of the invention, this field skill
Art personnel are contemplated that various equivalence changes and various combinations, and a combination thereof mode is a lot of, explanation numerous to list herein.Cause
This, the scope of the present invention should cover above-mentioned and other all equivalence changes.
Claims (15)
1. a kind of wireless power source transmitting line, characterized by comprising:
One power-switching circuit generates a conversion output voltage to convert an input voltage；
The conversion is exported electricity to switch wherein at least one switch according to an operation signal by one power inverter circuit
Pressure is converted and generates an ac output voltage, and supplies an ac output current, generates an output AC power whereby；
One LC circuit is coupled with the power inverter circuit, which includes an inductance and a capacitor,
In the LC circuit reactance substantially zero, the LC circuit is to be converted to a line for the ac output current
Loop current；
One resonance transmitting line includes an at least transmit coil and a variable capacitance circuit, and wherein the coil current flows through this extremely
A few transmit coil, and generate a resonant radio source；And
One control circuit, to generate the operation signal and a capacitor adjustment signal, wherein the capacitor adjustment signal is to adjust
The impedance of the variable capacitance circuit makes the resonance transmitting line be generally operating in an impedance matching situation.
2. wireless power source transmitting line according to claim 1, wherein the control circuit controls the power-switching circuit,
And/or adjust the operation signal and control the power inverter circuit, in the output AC power be lower than a predetermined power when,
The coil current is maintained at a default fixed coil electric current, and when the output AC power is not less than the predetermined power, it will
The output AC power is maintained at the predetermined power.
3. wireless power source transmitting line according to claim 1, wherein the control circuit according to the operation signal and/or
The coil current, and the capacitor adjustment signal is generated, to adjust the impedance of the variable capacitance circuit, it is maintained at the coil current
One first area minimum value.
4. wireless power source transmitting line according to claim 1, wherein the control circuit according to the ac output current,
And the capacitor adjustment signal is generated, to adjust the impedance of the variable capacitance circuit, the ac output current is made to be maintained at one second
Region minimum value.
5. wireless power source transmitting line according to claim 1, wherein the control circuit is according in the LC circuit
One capacitor cross-pressure of the capacitor, and generate the capacitor adjustment signal, to adjust the impedance of the variable capacitance circuit, make the capacitor across
Pressure is maintained at a third region minimum value.
6. wireless power source transmitting line according to claim 2, wherein the control circuit adjusts the one of the operation signal
Operating frequency and/or a work ratio, to control the power inverter circuit, to preset function not higher than this in the output AC power
When rate, which is maintained at the default fixed coil electric current, and when the output AC power is higher than the predetermined power,
The output AC power is maintained at the default fixed output power.
7. wireless power source transmitting line according to claim 1, wherein the power inverter circuit is a half-bridge or full-bridge
D class inverter circuit, an E class inverter circuit or a differential mode E class inverter circuit.
8. wireless power source transmitting line according to claim 1, wherein the power-switching circuit is that suitching type decompression turns
Change circuit or a suitching type voltage up converting circuit or suitching type lifting voltage conversion circuit or an AC-DC conversion circuit.
9. wireless power source transmitting line according to claim 1, wherein the inductance and the electricity in the LC circuit
Hold, forms an inductance capacitance inductor, resonant circuit with the transmit coil.
10. a kind of control method of wireless power source transmitting line, the wireless power source transmitting line is to send a resonant radio
Source, which is characterized in that the control method of the wireless power source transmitting line includes:
It converts an input voltage and generates a conversion output voltage；
Switch at least one switch according to an operation signal, which is converted and generates an exchange output electricity
Pressure, and an ac output current is supplied, an output AC power is generated whereby；
A LC circuit, including an inductance and a capacitor are provided, wherein the reactance of the LC circuit substantially zero,
The LC circuit is to be converted to a coil current for the ac output current；
By the way that the coil current is flowed through an at least transmit coil, which is converted into the resonant radio
Source；And
A capacitor adjustment signal is generated, to adjust the impedance of a variable capacitance circuit, grasps the resonance transmitting line generally
Make in an impedance match situation.
11. the control method of wireless power source transmitting line according to claim 10, wherein when the output AC power is low
When a predetermined power, the conversion output voltage or the ac output voltage are adjusted, which is maintained at one and is preset
Fixed coil electric current, and when the output AC power is not less than the predetermined power, adjust the conversion output voltage or the exchange
The output AC power is maintained at the predetermined power by output voltage.
12. the control method of wireless power source transmitting line according to claim 10, wherein one capacitor of generation adjustment letter
Number, to adjust the impedance of the variable capacitance circuit, the resonance transmitting line is made to be generally operating in an impedance match situation
Step includes: and to generate the capacitor adjustment signal according to the operation signal and/or the coil current, to adjust the variable capacitance
The impedance of circuit makes the coil current be maintained at a first area minimum value.
13. the control method of wireless power source transmitting line according to claim 10, wherein one capacitor of generation adjustment letter
Number, to adjust the impedance of the variable capacitance circuit, the resonance transmitting line is made to be generally operating in an impedance match situation
Step includes: and to generate the capacitor adjustment signal according to the ac output current, to adjust the impedance of the variable capacitance circuit,
The ac output current is set to be maintained at a second area minimum value.
14. the control method of wireless power source transmitting line according to claim 10, wherein one capacitor of generation adjustment letter
Number, to adjust the impedance of the variable capacitance circuit, the resonance transmitting line is made to be generally operating in an impedance match situation
Step includes: and to generate the capacitor adjustment signal according to a capacitor cross-pressure of the capacitor in the LC circuit, with adjust should
The impedance of variable capacitance circuit makes the capacitor cross-pressure be maintained at a third region minimum value.
15. the control method of wireless power source transmitting line according to claim 11, also includes: adjusting the operation signal
One operating frequency and/or a work ratio, when the output AC power is not higher than the predetermined power, which to be maintained
Fixed coil electric current is preset in this, and when the output AC power is higher than the predetermined power, which is maintained
In the default fixed output power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US15/984,291 US10742072B2 (en) | 2017-06-21 | 2018-05-18 | Wireless power transmitter circuit and control circuit and control method thereof |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US201762522937P | 2017-06-21 | 2017-06-21 | |
| US62/522,937 | 2017-06-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109103972A true CN109103972A (en) | 2018-12-28 |
Family
ID=64796433
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810300570.0A Pending CN109103972A (en) | 2017-06-21 | 2018-04-04 | Wireless power source transmitting line and its control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109103972A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016151889A1 (en) * | 2015-03-23 | 2016-09-29 | 三菱電機株式会社 | Bidirectional non-contact power supply device and bidirectional non-contact power supply system |
| CN205921458U (en) * | 2016-06-27 | 2017-02-01 | 中兴新能源汽车有限责任公司 | Wireless transmitting system of charging and wireless receiving system that charges |
| CN106549435A (en) * | 2015-09-22 | 2017-03-29 | 英特尔公司 | For the constant current radio-frequency signal generator of wireless charging system |
-
2018
- 2018-04-04 CN CN201810300570.0A patent/CN109103972A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016151889A1 (en) * | 2015-03-23 | 2016-09-29 | 三菱電機株式会社 | Bidirectional non-contact power supply device and bidirectional non-contact power supply system |
| CN106549435A (en) * | 2015-09-22 | 2017-03-29 | 英特尔公司 | For the constant current radio-frequency signal generator of wireless charging system |
| CN205921458U (en) * | 2016-06-27 | 2017-02-01 | 中兴新能源汽车有限责任公司 | Wireless transmitting system of charging and wireless receiving system that charges |
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