CN108183559A - The single-chip method of work that wireless charging receiving terminal directly charges the battery - Google Patents
The single-chip method of work that wireless charging receiving terminal directly charges the battery Download PDFInfo
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- CN108183559A CN108183559A CN201810030789.3A CN201810030789A CN108183559A CN 108183559 A CN108183559 A CN 108183559A CN 201810030789 A CN201810030789 A CN 201810030789A CN 108183559 A CN108183559 A CN 108183559A
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- 238000007600 charging Methods 0.000 title claims abstract description 87
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- 230000005611 electricity Effects 0.000 claims description 14
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- 238000013461 design Methods 0.000 abstract description 7
- 230000002093 peripheral effect Effects 0.000 abstract description 4
- 238000004891 communication Methods 0.000 description 11
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Classifications
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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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- H02J7/0022—
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
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- H02J7/025—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1582—Buck-boost converters
Abstract
The present invention provides the scheme that one chip realizes wireless telecommunications and quick charge simultaneously, the single-chip method of work that there is the wireless charging receiving terminal of higher charge efficiency, less peripheral component and smaller board design directly to charge the battery；Restored on chip with the mode of AC adapter with completing the DC power supply at wireless receiving end, it is charged using the power supply for direct pair of battery being connect with output terminal of subsequent circuit, wherein, in charging process, make corresponding adjust to input power, output current and output voltage using subsequent circuit；The basic framework of wireless charging is realized by single-chip, to obtain smaller circuit area, lower cost and higher charge efficiency, to ensure that system meets the demand of practical application.
Description
Technical field
The present invention relates to the technical fields of analog to digital hybrid circuit and integrated circuit, refer in particular to wireless charging and connect
The single-chip method of work that receiving end directly charges the battery.
Background technology
Wireless charging technology（Wireless charging technology）Derived from wireless power transmission technology.Wireless charging
There are two types of modes for electricity to transmit energy.When it is induction, the alternating current of certain frequency is generated in primary coil, passes through electromagnetism
Sensing generates certain electric current in secondary coil, so as to which energy is transferred to receiving terminal from transmitting terminal.Current main application
Agreement is WPC（Also known as Qi）And PMA.The frequency of transmitting terminal is generally than relatively low, between 80KHz ~ 205KHz.Another kind is magnetic field
It is resonant, when the device of transmitting terminal and receiving terminal is adjusted to identical frequency, in other words when resonating in a specific frequency, it
Can exchange mutual energy.Current main application protocol is A4WP, and transmitting terminal frequency is fixed 6.78MHz.
WPC（Wireless Power Consortium, or Qi）It is most widely used agreement and to be easiest at present
The a set of agreement realized.Its main supporter comes from Philip, three magnitudes.It transmits energy, nothing by electromagnetic induction
Line tranmitting frequency is in 85KHz ~ 205KHz.According to newest specification, the mode that transmitting terminal sends information to receiving terminal is frequency tune
System（Frequency Shift Keying, FSK）.And the mode that receiving terminal sends information to transmitting terminal is carried out with 2KHz frequencies
Load modulation（Load Modulation）.Although WPC application ranges are most wide at present, it the defects of can not be ignored.WPC is only
Can realize communication and the energy transmission of a transmitting terminal and receiving terminal, and require transmitting end-coil and receive end-coil that
It is aligned in position between this, to obtain good energy transmission efficiency.
PMA (Power Matters Alliance) is the agreement that another transmits energy using electromagnetic induction.It
Frequency can only realize the communication from receiving terminal to transmitting terminal near 200KHz in a manner of loading and modulate.But PMA exists special
Some software hooks（Software hook）To define agreement, control and managing signaling.
A4WP（Alliance for Wireless Power）What is walked is an other technology path.It is total to using magnetic
The mode shaken transmits energy.Its main supporter is from high pass, Google etc..A4WP defines the mature protocol with bluetooth come complete
Into the communication between transmitting terminal and receiving terminal, working frequency is fixed 6.78MHz.Its advantages of, is very prominent, compared to WPC,
The mutual communication of both direction can be realized easily, while it is of less demanding for the coil alignment degree of transmitting terminal and receiving terminal,
And it can realize a transmitting terminal simultaneously to multiple receiving terminal emitted energies.But it the shortcomings that it is similarly apparent, when
On this frequency point of 6.78MHz, the efficiency of transmission of energy is not high, second is that stage of this agreement also in popularization, not universal enough.
Generally speaking, the technology of electromagnetic induction is more ripe, cost is lower, charge efficiency is high, it is universal also faster.It but may
A kind of only solution of transition, because it requires power supply transmitting equipment and accepting device that could closely contact, one
Charge point can only fill an equipment, it is impossible to more equipment be supported to work at the same time.And magnetic resonance then represents following real trend,
Only it could allow wireless charging to be really used widely.Because it can realize remote wireless charging, a charging
Point just can simultaneously charge to multiple equipment.Only this technology is nowadays also immature, and charge efficiency is relatively low.
The chip of wireless charging receiving terminal is generally required including three modules.First, it is converted into direct current from coil AC energy
The rectification module of energy；Second is that rear step voltage conversion and Voltage stabilizing module；Third, the loop control of WPC/PMA and communication module.
As shown in Figure 1.
Rectification module is that the AC signal that coil is brought is become DC power supply by rectification circuit.Traditionally whole
Current circuit is usually four diodes composition as shown in Figure 1, this is asynchronous full-wave rectifying circuit.Due to the pressure on diode
Drop in more than 0.6V, causes asynchronous rectification circuit efficiency too high always.Chip design end, in order to improve efficiency and
It prevents from overheating, generally require using synchronous full-wave rectifying circuit, as shown in Fig. 4 and Fig. 6.So-called synchronous full-wave rectification, is root
The power tube of conducting electric current is opened according to current ac polar, is equivalent to the way for realizing ideal diode.This way can be with
Improve the efficiency of rectification.
Step voltage conversion and Voltage stabilizing module afterwards, being will by the structure of LDO or Buck by the power supply that full-wave rectification obtains
Voltage is dropped on the required level of subsequent conditioning circuit.The functional diagram of Fig. 1 is the framework of a Buck.It is real if the framework of LDO
Now get up fairly simple, Vrect and Vout voltage relatively close to when, good efficiency can be obtained.But this
Higher requirement is proposed to the design of receiving terminal coil.In addition there are one shortcomings for LDO frameworks, it is less susceptible to be compared
Good load response speed.Another structure is exactly Buck frameworks shown in FIG. 1, it has apparent advantage relative to LDO, than
Such as when Vrect and Vout differences are bigger, the odds for effectiveness of Buck just embodies clearly, this has also given receiving terminal
The more degree of freedom of design of coil.But this framework also requires to be with more components, such as inductance outside.Either
The framework of LDO or Buck, in order to prevent the overload of subsequent conditioning circuit and Vrect is worn down, needed in circuit design pair
The input power of Vrect is limited.I.e. on the basis of traditional Buck voltage loops, it is also necessary to which input power is examined
It surveys, i.e., detects Vrect voltages and input current Irect simultaneously, if on some Vrect electrical voltage point, find Irect mistakes
Greatly, then just being adjusted by loop reduces the duty ratio of Buck, so as to reduce Vout, reduces output power, prevents Vrect from being dragged
Collapse.
The loop control of WPC/PMA and communication module are to be designed to complete WPC/PMA with transmitting end communication, are belonged to
Load modulation or a warbled part.
Above is exactly the function of completion required for the receiving terminal chip infinitely to charge.Existing charging chip is described below
The design function module to be covered.Charging chip generally comprises switching regulator charging chip and linear-charging chip.It is if electric
Tankage is bigger, mostly using switching regulator charging chip, to realize quick charge；If battery capacity is smaller, use more
Linear-charging.
There are two types of the main frames of the quick charge chip of switching regulator, and a kind of is without path management, as shown in Figure 2；
Another kind is belt path management.By taking Fig. 2 as an example, traditional fast charge chip includes following several loops.When cell voltage
Control loop is compared with current cell voltage feedback Vbat and local reference voltage Vbat_ref, then adjusts Buck works
The duty ratio of work, to ensure that cell voltage is no more than desired value.Second is that charging current loop, it, which needs to detect, currently gives electricity
Then the electric current Ichg in pond is compared with local reference current Ichg_ref, the duty ratio of adjustment Buck work, to ensure electricity
Pond charging current is no more than default value.The detection of battery charge Ichg is connected on battery by periphery in Fig. 2
Precision resistance Rsout realize.Chip gets off the voltage sample on precision resistance, is carried out with the reference voltage of chip interior
Compare, so as to know current charging current value.If belt path management, the detection of battery charge is to measure to pass through chip
The electric current of inner track power tube, general method is the mode with image current, charging current scaled down, Ran Houyu
Internal reference current is compared, so as to know the value of current charging current.Third, input current loop, it is responsible for detecting defeated
Enter the size of electric current Iin, be then compared with local reference current Iindpm_ref, if input current approaches or super
Cross threshold value, then this loop can adjust the duty ratio of Buck work, reduce output voltage, to reduce the method for output power
Reduce input current, ensure that it is no more than the threshold value of default.The setting for inputting current limliting loop is powered often from periphery
The requirement of equipment.For example the interface of USB2.0, its output current ability only have 500mA, then rushing chip soon needs input
The threshold value of current limliting loop is set in 500mA, prevents from collapsing the drawing of the power supply of input during large current charge.Fourth, input pressure limiting loop,
It is responsible for detecting the size of input voltage vin, is then compared with local reference voltage Vdpm_ref, if input voltage connects
Closely or less than threshold value, then this loop can adjust the duty ratio of Buck work, output voltage be reduced, to reduce output power
Method raise input voltage, ensure its not low threshold value for crossing default.The situation of this loop processed is in input current limliting
The situation of loop processed is similar, is provided to ensure that the load of peripheral power supply unit is in suitable value, is not in overload
Situation.Fifth, chip temperature control loop, it is responsible for the temperature of detection chip, as the temperature of fruit chip is near or above threshold
Value, then this loop can adjust the duty ratio of Buck work, reduce output voltage, reduced with reducing the method for output power
The power consumption of chip in itself, so as to which chip be controlled not overheat.In addition to five loops of charging control, quick charge chip also passes through
NTC resistance is monitored battery temperature, it is ensured that temperature safety of the battery in entire charging process.If it find that the temperature of battery
Height or too low is spent, is required for stopping charging.Either according to JEITA standards when battery temperature is relatively low or higher, reduce
Charging current reduces charging by voltage.
And the framework of linear-charging chip is then simple many, it is typically class LDO frameworks.Due to input current and output
Electric current is very close, so input current need not be separately monitored.It generally comprises four control loops, inputs pressure limiting loop, defeated
Go out voltage loop, charging current loop and chip temperature control loop.Similar to the control of switching regulator framework, this four loops
All it is to be compared monitoring variable with threshold value, if monitoring variable is more than threshold value, reduces output current（That is charging current）, with this
To ensure the safety of charging process.
Invention content
Realize wireless telecommunications and quick simultaneously it is an object of the invention to overcome the deficiencies of the prior art and provide one chip
The scheme of charging, the wireless charging with higher charge efficiency, less peripheral component and smaller board design connect
The single-chip method of work that receiving end directly charges the battery.
In order to realize above-mentioned purpose, the single-chip that wireless charging receiving terminal provided by the present invention directly charges the battery
Method of work is restored with completing the DC power supply at wireless receiving end with the mode of AC adapter on chip, utilizes the power supply
It charges for direct pair of battery being connect with output terminal of subsequent circuit, wherein, in charging process, using subsequent circuit to defeated
Enter power, output current and output voltage and make corresponding adjust.
Further, wireless receiving end first by the method for AC rectification the radio wave that coil couples to be changed into directly
Galvanic electricity pressure is used for subsequent circuit, wherein, the mode of AC rectification is full-wave rectification or halfwave rectifier；Then wireless receiving end with
Transmitting terminal completes related protocol and shakes hands to establish stable communication process, wherein, which is WPC（Qi）, PMA or
A4WP。
Further, after power supply is restored at wireless receiving end, subsequent circuit is with the framework of switching circuit that is preset with to battery
It charges, wherein, the framework of the switching circuit is Buck, Boost or Buck-Boost, so as to corresponding power voltage respectively
It is consistently higher than the situation of cell voltage, supply voltage is consistently lower than the situation of cell voltage and supply voltage and cell voltage
Magnitude relationship situation about can change in charging process.
Further, after power supply is restored at wireless receiving end, switching circuit carries out quick charge to battery, wherein, switch electricity
Road controls charging current, charging by voltage, input power, chip temperature during quick charge
Further, when switching circuit charges for single battery, switching circuit is the framework of Buck；When switching circuit pair
When multiple batteries are charged, switching circuit is the structure of Boost or Buck-Boost.
Further, the battery being connect by wired input power pair in parallel with output terminal charges.
The present invention uses above-mentioned scheme, and advantage is：The application realizes the base of wireless charging by single-chip
This framework, to obtain smaller circuit area, lower cost and higher charge efficiency, to ensure that system meets reality
The demand of application.
Description of the drawings
Fig. 1：Conventional wireless charging receiving terminal functional-block diagram.
Fig. 2：Traditional quick charge chip functions block diagram.
Fig. 3：For one of single-chip wireless charging control program of the present invention.
Fig. 4：Two for single-chip wireless charging control program of the present invention.
Fig. 5：Three for single-chip wireless charging control program of the present invention.
Fig. 6：Four for single-chip wireless charging control program of the present invention.
Fig. 7：Five for single-chip wireless charging control program of the present invention.
Specific embodiment
With reference to specific embodiment, the present invention is further illustrated.
In the present embodiment, the single-chip method of work that wireless charging receiving terminal directly charges the battery, is used on chip
The mode of AC adapter supplies direct pair of follow-on system and output terminal to complete the power up at wireless receiving end, using the power supply
The battery of connection charges, wherein, in charging process, using follow-on system to input power, output current and output electricity
Pressure makees corresponding adjust.
For this method of work, charge construction proposed by the invention includes Power generation circuit, home control network communication protocol
It shakes hands and three parts of charge loop.
First part is Power generation circuit, and framework as shown in Figure 3 is the asynchronous rectified circuit of all-wave；As shown in Figure 4
Framework is all-wave circuit of synchronous rectification.Asynchronous rectified circuit in such as Fig. 3 is attached using four diodes, through coil
The AC signal AC1 and AC2 to come over is sent into the network that diode is formed, in rectified voltage（Vrect）It is formed between Gnd straight
Galvanic electricity pressure.Work as AC1>During AC2, D1 and D4 conducting electric currents are Vrect ends capacitor charging；Work as AC1<During AC2, D2 and D3 electric conductions
Stream is the capacitor charging at Vrect ends.In this manner, due to the use of be not ideal diode, electric current passes through two poles
The pressure drop of about 0.6V or so is had when pipe, so the efficiency of asynchronous rectified circuit is not high, fever is serious.And Fig. 4 institutes
The synchronization full-wave rectifying circuit shown, works as AC1>During AC2, MN1 and MN4 are actively opened, and conducting electric current is Vrect ends capacitor charging；
Work as AC1<During AC2, MN2 and MN3 are actively opened, and conducting electric current is the capacitor charging at Vrect ends.There is rationally drive with reference to preset
The power tube of circuit is moved, then their working condition is equivalent to ideal diode, and the electric current for Vrect chargings flows through power tube
When, pressure drop is only related with conducting electric current with its conducting resistance, and the efficiency of such rectification circuit greatly improves, and calorific value is also substantially
Degree reduces.
Further, wireless receiving end first by the method for AC rectification the radio wave that coil couples to be changed into directly
Galvanic electricity pressure is used for follow-on system, wherein, the mode of AC rectification is full-wave rectification or halfwave rectifier；Then wireless receiving end with
Transmitting terminal completes related protocol and shakes hands to establish stable communication process, wherein, which is WPC（Qi）, PMA or A4WP
Or other any relevant wireless charging agreements.
Second part is that home control network communication protocol is shaken hands, and includes the agreement of logical gate and load modulating part, wirelessly
Communications protocol needs to meet WPC（Qi）, tri- kinds of agreements of PMA and A4WP, two work frequencies of compatible 80KHz ~ 220KHz and 6.78MHz
Section, while also need to realize to load regulation and receiving terminal to the communication between transmitting terminal.
Part III is the charge loop after Vrect, and by taking Fig. 3 and Fig. 4 as an example, the framework of charge loop will at least include
Four loop controls.
First loop is output voltage control loop, and the major loop of this Buck framework ensures in charging process, battery
Voltage is no more than the threshold value of setting, the problem of over-charging of battery will not occur, by comparing the feedback voltage V bat of battery-end always
With the reference voltage Vbat_ref of chip interior, if Vbat is near or above Vbat_ref, the control of output voltage control loop
The duty ratio of pwm signal can be reduced, thus to achieve the effect that reduce output voltage.
Second loop is charging current control loop, is responsible for monitoring the electric current for flowing to battery in charging process, control is filled
Electric current is no more than the threshold value set by system.According to the difference of framework, the method for realizing charging current monitoring has the following two kinds,
One kind is by resistance detection output current size, and another kind is to flow through the electric current of switching power tube by detection come work.Before
It is a kind of as shown in figure 3, this resistance Rsout framves are between the output Vsys of Buck and battery Vbat, charging current loop is inspection
The voltage (Vsys-Vbat) at measuring resistance both ends is compared with reference voltage Rsout x Ichg_ref, if resistance both ends are electric
Pressure has been more than threshold value, be reduced by Buck work duty ratio, reduce output voltage, so as to charging current control threshold value with
It is interior.Detection resistance can use the resistance of built-in chip type to realize, can also be realized with the precision resistance outside chip.It is another such as to scheme
Shown in 4, this power tube Qp framves are between the output Vsys of Buck and battery Vbat.The difference of this framework is, if electric
Cell voltage is less than the startup voltage of follow-on system, then Buck can ensure the voltage at Vsys ends using Vsys as output feedback point
More than minimum system operating voltage, to ensure the work of follow-on system.Power tube Qp can be operated in linear zone simultaneously, to electricity
It charges in pond.After cell voltage is higher than the startup voltage of follow-on system, power tube Qp is allowed to fully open, with low resistance
Mode works, and the voltage loop of Buck enters the pattern of quick charge then using cell voltage Vbat as feedback point.Power tube
When Qp is as linear charger, whole system control can be not involved in, but is worked in a manner of current source.Power tube Qp makees
During for resistance, charging current can be detected by way of current mirror, and be compared with internal reference current, if charging
Electric current has been more than threshold value, be reduced by Buck work duty ratio, reduce output voltage, so as to charging current control threshold value with
It is interior.
Third loop is input power control loop, need to detect the voltage of Vrect simultaneously and Vrect flows into rear class electricity
The electric current Irect on road.The detection mode of input current Irect as shown in Figure 3 and Figure 4, the resistance that can be integrated with chip interior
Rsin or with precision resistance Rsin framves Vrect and Buck input between, obtained by the voltage difference at detection resistance both ends
The size of input current.The voltage of Vrect can be obtained directly by the partial pressure of Vrect.Calculate the mode of input power Pin
There are two types of realization methods.First, directly V x I are realized with circuit, as shown in Figure 3.The input power Pin being calculated again with it is defeated
The reference value Pin_ref for entering power compares, if Pin is near or above Pin_ref, loop control reduces the duty of PWM
Than to reduce output power, so as to which input power is controlled within threshold value.The shortcomings that this mode, is that circuit realizes multiplication
Relatively difficult or realization multiplication speed is slow, causes loop control corresponding not in time.The second way is to use
Input power is limited by way of defining input impedance, as shown in Figure 4.System defines minimum input impedance Zin_ref,
Circuit counting Vrect/Irect obtains input impedance Zin.If Zin is near or below threshold value Zin_ref, it is reduced by
The duty ratio of Buck work, reduces output voltage, so as to which input impedance is controlled more than default.In this mode,
Circuit can not be directly realized by division, but calculate Zin_ref x Irect, i.e., input current by circuit with blocked impedance
Zin_ref is transformed into voltage, is then compared again with Vrect.Circuit in this way realize relatively simple, loop
The response speed of control can be designed than very fast.Other than setting input power limitation in addition to above two mode, also separately
Outer two simple realizations.First, directly by the threshold value of default input current, the other is being inputted by default
The lowest threshold of voltage Vrect.Only last two ways is not so good as front two ways closer to the target of power limit.
4th loop is chip temperature control, in fact by the variation of the PTAT voltage inside detection chip, so as to come
Judge chip whether excess temperature, when detect PTAT voltage it is low cross reference voltage threshold when, represent chip over-temperature.It can take at this time
Two ways maintains chip power-consumption not to be further added by.When it directly reduces output current threshold value or reduces input current threshold value；Two
It is to control to obtain mode using loop, reduces the PWM duty cycle of Buck, reduce output voltage, so as to which the power consumption control of chip is lived.
By above four loops so that switching circuit is during charging, to charging current, charging by voltage,
Input power, chip temperature are controlled, thus to achieve the purpose that safe charging.
In the present embodiment, in addition to wireless coil and full-wave rectifying circuit can charge to Vrect, and it is follow-on system
Charge loop is provided other than power supply, can be powered with wired input path in parallel to Vrect.Fig. 3 and Fig. 4 gives in parallel
Wired input power supply.When USB port provides power supply, system can select to open the power tube on wireline pathway, allow and be with outside
Line power supply is powered directly to Vrect, and the charge loop work for being after driving, and is charged the battery.
In the present embodiment, the framework of the switching circuit is Buck, Boost or Buck-Boost, thus to correspond to respectively
Supply voltage is consistently higher than the situation of cell voltage, supply voltage be consistently lower than cell voltage situation and supply voltage with
The situation that the magnitude relationship of cell voltage can change in charging process.When switching circuit charges for single battery, open
Powered-down road is the framework of Buck；When switching circuit charges to multiple batteries, switching circuit is Boost or Buck-Boost
Structure.That is, the described frameworks of Fig. 3 and Fig. 4 are the applications charged to single battery, to give two batteries or multiple batteries
Charging, then Buck frameworks are just no longer applicable in, for this purpose, the present invention proposes the Buck- to multiple batteries charging such as Fig. 5 and Fig. 6
There is Vrect to cope with the meeting camera in entire charging process in Boost frameworks>The situation and Vrect of Vbat>The feelings of=Vbat
Shape.
Described in Fig. 5 is the feelings of asynchronous full-wave rectifying circuit and Buck-Boost frameworks so as to charge to multiple batteries
Condition.Fig. 6 describes the situation that synchronous full-wave rectifying circuit and Buck-Boost frameworks charge to multiple batteries.As shown in figure 5,
In charging end, the control of input power can be calculated and be controlled with practical multiplier.As shown in fig. 6, also may be used
Input power is limited in a manner of practical input impedance control loop.For the loop of output current, in other words charging current
Control, Fig. 5 and Fig. 6 are detected and are controlled with the mode of detection precision resistance both end voltage.The road of multiple batteries
Diameter management is relatively complicated, so not reacted directly in Fig. 5 and Fig. 6.In addition, in addition to adding full-wave rectification with wireless coil
Circuit is provided other than power supply, here can also wired input in parallel access, while give the power supply of Vrect ends.
Other than integrated switch formula charging circuit, the application for small Electronic power batteries, we can also integrated linear fill
Electric appliance, as described in Figure 7.For such application, charge control loop is changed to input voltage control loop, output electricity
Control loop, output current control loop and temperature control loops are pressed, while remove the inductance element of periphery, more conducively scheme
Miniaturization.
This programme, with the working method of single-chip, completes above-mentioned target, with the existing wireless charging scheme of simplification by system
Realization method, reduce number of chips, while reduce peripheral component, reduce overall plan occupied area.
The embodiment of the above is only presently preferred embodiments of the present invention, and limit in any form is not done to the present invention
System.Any those skilled in the art without departing from the scope of the technical proposal of the invention, utilize the skill of the disclosure above
Art content makes technical solution of the present invention more possible variations and retouching or modification is the equivalent embodiment of the present invention.
Therefore all contents without departing from technical solution of the present invention, the equivalent equivalence changes that thinking according to the present invention is made should all be covered by
In protection scope of the present invention.
Claims (6)
1. the single-chip method of work that wireless charging receiving terminal directly charges the battery, it is characterised in that：With exchange on chip
The mode of rectifier is connect to complete the power up at wireless receiving end, using the power supply for direct pair of subsequent circuit with output terminal
Battery charge, wherein, in charging process, using subsequent circuit to input power, output current and output voltage make
It is corresponding to adjust.
2. the single-chip method of work that wireless charging receiving terminal according to claim 1 directly charges the battery, feature
It is：Wireless receiving end first by the method for AC rectification with by the radio wave that coil couples be changed into DC voltage supply after
It is used after circuit, wherein, the mode of AC rectification is full-wave rectification or halfwave rectifier；Then wireless receiving end is completed with transmitting terminal
Related protocol is shaken hands to establish stable communication process, wherein, which includes WPC（Qi）, PMA or A4WP.
3. the single-chip method of work that wireless charging receiving terminal according to claim 1 directly charges the battery, feature
It is：After power supply is restored at wireless receiving end, subsequent circuit is charged the battery with the framework for the switching circuit being preset with,
In, the framework of the switching circuit is Buck, Boost or Buck-Boost, so as to be consistently higher than electricity with corresponding power voltage respectively
The situation of cell voltage, supply voltage are consistently lower than the situation of cell voltage and the magnitude relationship of supply voltage and cell voltage
In the situation that charging process can change.
4. the single-chip method of work that wireless charging receiving terminal according to claim 3 directly charges the battery, feature
It is：After power supply is restored at wireless receiving end, switching circuit carries out quick charge to battery, wherein, switching circuit is quickly filling
Charging current, charging are controlled by voltage, input power, chip temperature during electricity.
5. the single-chip method of work that wireless charging receiving terminal according to claim 3 directly charges the battery, feature
It is：When switching circuit charges for single battery, switching circuit is the framework of Buck；When switching circuit is to more piece electricity
When pond is charged, switching circuit is the structure of Boost or Buck-Boost.
6. the single-chip method of work that wireless charging receiving terminal according to claim 1 directly charges the battery, feature
It is：The battery being connect by wired input power pair in parallel with output terminal charges.
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Address after: Unit 305-308, block A8, qiandenghu venture capital town, no.6, Guilan North Road, Guicheng Street, Nanhai District, Foshan City, Guangdong Province, 528000 Applicant after: Guangdong Xidi Microelectronics Co.,Ltd. Address before: Unit 305-308, block A8, qiandenghu venture capital town, no.6, Guilan North Road, Guicheng Street, Nanhai District, Foshan City, Guangdong Province, 528000 Applicant before: GUANGDONG HALO MICROELECTRONICS Co.,Ltd. |
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Application publication date: 20180619 |