CN103855782B - A kind of wireless charger adaptive power output power control method - Google Patents
A kind of wireless charger adaptive power output power control method Download PDFInfo
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- CN103855782B CN103855782B CN201410015818.0A CN201410015818A CN103855782B CN 103855782 B CN103855782 B CN 103855782B CN 201410015818 A CN201410015818 A CN 201410015818A CN 103855782 B CN103855782 B CN 103855782B
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Abstract
The present invention relates to a kind of adaptive power control method of wireless charger.The wireless charger output of QI standards is a voltage source, the power of output depends on the load of output, when output current is bigger, due to the internal resistance of source, input voltage meeting step-down, when the low minimum voltage to microprocessor of voltage can cause the reset of microprocessor, so as to cause interrupt power to be transmitted.The core content of the present invention is that one kind can be by the way that in the case of two kinds of dynamic and static state, limitation instantaneous power prevents microprocessor reset, and controls power output to reach maximum control method.
Description
Technical field
The present invention is used for the wireless charger of QI standards, required for the power that input DC power provides is less than output
During power, adjust automatically power output prevents chip reset to adapt to the demand of input power.
Background technology
In existing conventional wireless charging technology, QI standards have been increasingly becoming the wireless charging standard of main flow.The nothing of QI standards
The principle of micro USB electrical equipment such as Fig. 1, shown in Fig. 2, input direct-current 5V, by full-bridge or half-bridge inversion circuit, resonant LC-circuit is work(
Rate sends receiving terminal to, and receiving terminal is by loading the data of modulation communication circuit transmission receiving terminal, such as the power received, output
The physical quantitys such as the margin of error of voltage.Transmitting terminal receives data by loading demodulation telecommunication circuit, and transmitting terminal microprocessor receives
It is by control method regulating frequency or dutycycle that the margin of error regulation of output voltage is attached to 0 after the margin of error of output voltage
Closely.
Such as Fig. 3, the receiving terminal main circuit of wireless charger is formed, connect by double resonance system, rectifier bridge, linear stable
DC voltage after the detection rectification of receiving end chip, the error of this voltage and given voltage, by loading modulation communication electricity
Road is sent to the transmitting terminal of wireless charger, and transmitting terminal changes frequency or dutycycle to stablize receiving terminal by control method
DC voltage after rectification, to maintain the stabilization of output voltage.
QI standards specific control method such as Fig. 4, wireless charger control the hair of next bat by Fig. 4 control method
End electric current is penetrated, the instruction of transmitting terminal electric current produces required frequency or dutycycle, wherein j=by a PID approach
The order of 1,2,3 ... the control error information frames received labeled as transmitting terminal.It has received j-th of control error information frame
Afterwards, transmitting terminal calculates the new current-order of next data frame by below equation：
Wherein：Represent the upper finally stabilised actual current of a data frame, c(j)The control that receiving terminal is sent is represented to miss
Difference data.If c(j)It is the number of non-zero, transmitting terminal should be in tactiveInterior regulation transmitting terminal electric current.In order to realize this target,
Transmitting side controller can perform the control of digital rings, the iteration exponent number i=1 of loop control, and 2,3 ... represent.Transmitting
End calculates the error of digital control ring with following formula.
WhereinUpper one for current data frame claps iteration actual current
Control method uses Discrete PI control method：
Ratio controls：P(j,i)=Kp·e(j,i)
Integration control：I(j,i)=I(j,i-1)+Ki·e(j,i)·tinner
Differential controls：
PID(j,i)=P(j,i)+I(j,i)+D(j,i)
Wherein tinnnerIt is the interval time of each order iteration.
KpFor proportional control factor
KiFor integral control coefficient
KdFor derivative control coefficient
After obtaining PID controller output, desired rate-adaptive pacemaker is obtained by following formula or dutycycle exports：
v(j,i)=v(j,i-1)-Sv·PID(j,i)
According to this method, if load reaches 5 ohm, because output is a voltage source 5V, then output current meeting
Reach 1A, if the power of input adapter power supply only has 5W, it is clear that wireless charger in order to maintain export 5V voltage will
Working frequency is constantly reduced, with the increase of output current, input voltage is gradually pulled down to 4V even following, wireless chargings
Device will interrupt charging.That is, if wireless charger is powered from the USB port of computer, it will occurs interrupting wireless pass
It is defeated.In order to solve this problem, the present invention proposes a kind of improved control method, and the effect of this method is mainly dynamic
When, output current is quickly reduced, lifts input voltage, maintains the normal work of main control chip, is exported most when stable state
Big power.
The content of the invention
Wireless charger controls the transmitting terminal electric current of next bat, the instruction of transmitting terminal electric current by Fig. 4 control method
Required frequency or dutycycle are produced by a PID approach, wherein j=1,2,3 ... receive labeled as transmitting terminal
Control error information frame order.After have received j-th of control error information frame, transmitting terminal is calculated down by below equation
The new current-order of one data frame：
Wherein：Represent the upper finally stabilised actual current of a data frame, c(j)The control that receiving terminal is sent is represented to miss
Difference data.If c(j)It is the number of non-zero, transmitting terminal should be in tactiveInterior regulation transmitting terminal electric current.In order to realize this target,
Transmitting side controller can perform the control of digital rings, the iteration exponent number i=1 of loop control, and 2,3 ... represent.Transmitting
End calculates the error of digital control ring with following formula.
WhereinUpper one for current data frame claps iteration actual current
Control method uses Discrete PI control method：
Ratio controls：P(j,i)=Kp·e(j,i)
Integration control：I(j,i)=I(j,i-1)+Ki·e(j,i)·tinner
Differential controls：
PID(j,i)=P(j,i)+I(j,i)+D(j,i)
Wherein tinnnerIt is the interval time of each order iteration.
KpFor proportional control factor
KiFor integral control coefficient
KdFor derivative control coefficient
After obtaining PID controller output, desired rate-adaptive pacemaker is obtained by following formula or dutycycle exports：
v(j,i)=v(j,i-1)-Sv·PID(j,i)
It is 250ms due to controlling the transmission interval of error information frame, so the response speed of the controller is less than 250ms,
When load is dynamically added, input voltage can drag down moment, when the voltage is less than the minimum resetting voltage of main control chip, can draw
Play the interruption of power transmission.If the power required for being exported in addition in stable state is more than the power that input can be provided, also can
Cause input voltage to be less than the minimum resetting voltage of main control chip, cause the interruption of power transmission.
The present invention adds the Voltage loop of a variable-structure control on original controller, as shown in Figure 4.Dynamic
When, ratio control ring is cut, if input voltage falls, ratio control is swift in response, quick to reduce output current dimension
Input voltage is held no longer to fall.In order to maintain the stabilization of power output when stable state, and peak power output is kept, cut
PI control rings, the loop bandwidth is slower, to maintain stable power output.
Brief description of the drawings
Fig. 1, wireless charging system block diagram
Fig. 2, wireless charger receiving terminal circuit schematic diagram
Fig. 3, QI standard control method
Fig. 4, the control method for adding structure changes Voltage loop
Embodiment
In conjunction with accompanying drawing and example, the present invention is described in further detail.
Wireless charger controls the transmitting terminal electric current of next bat, the instruction of transmitting terminal electric current by Fig. 4 control method
Required frequency or dutycycle are produced by a PID approach, wherein j=1,2,3 ... receive labeled as transmitting terminal
Control error information frame order.After have received j-th of control error information frame, transmitting terminal is calculated down by below equation
The new current-order of one data frame：
Wherein：Represent the upper finally stabilised actual current of a data frame, c(j)The control that receiving terminal is sent is represented to miss
Difference data.If c(j)It is the number of non-zero, transmitting terminal should be in tactiveInterior regulation transmitting terminal electric current.In order to realize this target,
Transmitting side controller can perform the control of digital rings, the iteration exponent number i=1 of loop control, and 2,3 ... represent.Transmitting
End calculates the error of digital control ring with following formula.
WhereinUpper one for current data frame claps iteration actual current
Control method uses Discrete PI control method：
Ratio controls：P(j,i)=Kp·e(j,i)
Integration control：I(j,i)=I(j,i-1)+Ki·e(j,i)·tinner
Differential controls：
PID(j,i)=P(j,i)+I(j,i)+D(j,i)
Wherein tinnnerIt is the interval time of each order iteration.
KpFor proportional control factor
KiFor integral control coefficient
KdFor derivative control coefficient
After obtaining PID controller output, desired rate-adaptive pacemaker is obtained by following formula or dutycycle exports：
v(j,i)=v(j,i-1)-Sv·PID(j,i)
It is 250ms due to controlling the transmission interval of error information frame, so the response speed of the controller is less than 250ms,
When load is dynamically added, input voltage can drag down moment, when the voltage is less than the minimum resetting voltage of main control chip, can draw
Play the interruption of power transmission.If the power required for being exported in addition in stable state is more than the power that input can be provided, also can
Cause input voltage to be less than the minimum resetting voltage of main control chip, cause the interruption of power transmission.
The present invention adds the Voltage loop of a variable-structure control on original controller, as shown in Figure 4.Dynamic
When, ratio control ring is cut, if input voltage falls, ratio control is swift in response, quick to reduce output current dimension
Input voltage is held no longer to fall.In order to maintain the stabilization of power output when stable state, and peak power output is kept, cut
PI control rings, the loop bandwidth is slower, to maintain stable power output.
When the moment that receiving terminal has just been put up, load is not added up, and input voltage does not fall, therefore the Voltage loop does not act as
With.When load transients load, input voltage declines rapidly and functioned to more than the value of certain reservation, ratio control voltage ring,
Frequency is reduced, reduces output current, input voltage is begun to ramp up, while Voltage loop is changed to the PI controllers of low bandwidth, is maintained defeated
Go out stable, the raising stability of a system.
Claims (3)
1. wireless charger adaptive power control method, it is characterized in that, it is used as control by the use of the difference of input voltage and given voltage
Object, falling for input voltage is prevented by specific method, while ensure that average output power maximizes；Specifically,
When dynamic and when load transients load, input voltage declines rapidly and during more than certain predetermined value, incision ratio control
Ring, if input voltage falls, ratio control is swift in response, and quickly reduces output current, reduces frequency to maintain to input
Voltage no longer falls, to prevent chip reset；In order to maintain the stabilization of power output when stable state, and keep maximum output
Power, and when the input voltage is begun to ramp up, PI control rings are cut, the loop bandwidth is slower, to maintain stable work(
Rate exports, wherein, the transmitting terminal of wireless charger changes frequency or dutycycle by following control method and received come stable
DC voltage after the rectification at end, to maintain the stabilization of output voltage；
Wireless charger controls the transmitting terminal electric current of next bat by following control method, and the instruction of transmitting terminal electric current passes through one
Individual PID approach produces required frequency or dutycycle, wherein j=1,2,3 ... the controls received labeled as transmitting terminal
The order of error information frame, after have received j-th of control error information frame, transmitting terminal calculates next number by below equation
According to the new current-order of frame：
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Wherein：Represent the upper finally stabilised actual current of a data frame, c(j)Represent the control margin of error that receiving terminal is sent
According to if c(j)It is the number of non-zero, transmitting terminal should be in tactiveInterior regulation transmitting terminal electric current, in order to realize this target, transmitting
Side controller can perform the control of digital rings, the iteration exponent number i=1 of loop control, and 2,3 ... are represented, transmitting terminal is used
Following formula calculates the error of digital control ring：
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WhereinUpper one for current data frame claps iteration actual current
Control method uses discrete PID control method：
Ratio controls：P(j,i)=Kp·e(j,i)
Integration control：I(j,i)=I(j,i-1)+Ki·e(j,i)·tinner
Differential controls：
PID(j,i)=P(j,i)+I(j,i)+D(j,i)
Wherein tinnerIt is the interval time of each order iteration；
KpFor proportional control factor；
KiFor integral control coefficient；
KdFor derivative control coefficient；
After obtaining PID controller output, desired rate-adaptive pacemaker is obtained by following formula or dutycycle exports：
v(j,i)=v(j,i-1)-Sv·PID(j,i)。
2. wireless charger adaptive power control method as claimed in claim 1, is by input voltage and given voltage
Difference as control object, the method for adoption rate control improves dynamic property.
3. wireless charger adaptive power control method as claimed in claim 1, is by input voltage and given voltage
Difference as control object, steady-state error is reduced using the method for PI feedback controls.
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105811485B (en) * | 2014-12-30 | 2018-06-19 | 中国科学院沈阳自动化研究所 | A kind of load constant current control method of the wireless charging system of the underwater device that moves under water |
| CN105871082B (en) * | 2016-04-26 | 2019-03-01 | 中国科学技术大学 | PID control method in radiant type radio energy transmission system |
| CN107919737A (en) * | 2016-10-10 | 2018-04-17 | 三星电机株式会社 | Wireless power transmitter and the method for wirelessly sending electric power |
| WO2021217981A1 (en) * | 2020-05-21 | 2021-11-04 | 青岛海尔智能技术研发有限公司 | Direct-current wireless power supply device, and control method and control apparatus therefor |
| CN113809796B (en) * | 2021-08-31 | 2024-05-14 | 北京中海技创科技发展有限公司 | Output power self-adaption system and method for power manager |
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| CN101335456A (en) * | 2008-07-18 | 2008-12-31 | 湖南大学 | Power distributing reactive optimizing compensation system based on GPRS and control method thereof |
| CN103208865A (en) * | 2012-01-11 | 2013-07-17 | 三星电子株式会社 | Overvoltage protecting device for resonance wireless power transmitting apparatus and controlling method thereof |
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| JP2008509643A (en) * | 2004-08-04 | 2008-03-27 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | Converter circuit with forward and backward control |
| JP5605143B2 (en) * | 2010-10-01 | 2014-10-15 | ミツミ電機株式会社 | Current control circuit |
| US9337664B2 (en) * | 2010-12-16 | 2016-05-10 | Qualcomm Incorporated | Wireless power receiver circuitry |
| TW201251269A (en) * | 2011-04-25 | 2012-12-16 | Intersil Americas LLC | Charging system with adaptive power management |
| US20130127405A1 (en) * | 2011-11-17 | 2013-05-23 | Helmut Scherer | Wireless charging system and apparatus, and control method thereof |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101335456A (en) * | 2008-07-18 | 2008-12-31 | 湖南大学 | Power distributing reactive optimizing compensation system based on GPRS and control method thereof |
| CN103208865A (en) * | 2012-01-11 | 2013-07-17 | 三星电子株式会社 | Overvoltage protecting device for resonance wireless power transmitting apparatus and controlling method thereof |
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Effective date of registration: 20191024 Address after: 100000 D412-1, 3rd floor, Block D, 9th Shangdi Sanjie, Haidian District, Beijing Patentee after: BEIJING INVISPOWER TECHNOLOGY CO., LTD. Address before: 518100 Guangdong city of Shenzhen province Baoan District new road 82 Zone Huafeng Science & Technology Park A District 611 Patentee before: SHENZHEN PRIME TECHNOLOGY CO., LTD. |
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Address after: 230088 China (Anhui) pilot Free Trade Zone, Hefei, Anhui Province a3-15, 14 / F, block a, building J1, phase II, innovation industrial park, No. 2800, innovation Avenue, high tech Zone, Hefei Patentee after: Hefei Yougan Technology Co.,Ltd. Address before: 100000 d412-1, floor 3, block D, No. 9, Shangdi Third Street, Haidian District, Beijing Patentee before: BEIJING INVISPOWER TECHNOLOGY Co.,Ltd. |