CN115940363B - Wireless charging transmitting terminal adjusting method - Google Patents
Wireless charging transmitting terminal adjusting method Download PDFInfo
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- CN115940363B CN115940363B CN202310153332.2A CN202310153332A CN115940363B CN 115940363 B CN115940363 B CN 115940363B CN 202310153332 A CN202310153332 A CN 202310153332A CN 115940363 B CN115940363 B CN 115940363B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
Abstract
The invention discloses a wireless charging transmitting terminal adjusting method, which is used for presetting a charging voltage range of a power battery and a minimum value of an input voltage of an inverter; acquiring a charging voltage value of a power battery and an input voltage value of an inverter to obtain a gain voltage value; obtaining a minimum segmentation voltage value and a maximum segmentation voltage value according to the gain voltage value; the minimum value, the minimum sectional voltage value and the maximum sectional voltage value of the input voltage of the inverter are all in a preset power battery charging voltage range, and the input voltage of the inverter is divided into four sections; matching the charging voltage value of the power battery with four intervals, and correspondingly adjusting if the charging voltage value falls into different intervals; the common mode is that at most two of the phase of the transmitting end, the control frequency and the input voltage of the inverter are selected for adjustment. The three values are easy to adjust, safe and reliable, the whole method presets the charging voltage range of the fixed power battery, and the requirements of all electric vehicles on the market can be met for wireless charging of the electric vehicles.
Description
Technical Field
The invention relates to the field of wireless charging, in particular to a wireless charging transmitting end adjusting method.
Background
In a high-power wireless power supply system of an electric automobile, the mechanical clearance range is large, so that the mutual inductance range is also large, and the gain range of the system is large. In order to meet the charging requirements of the power batteries of the electric vehicles with the low-voltage version and the high-voltage version at the same time, the variation range of the voltage required to be input is larger, so that the voltage range of the power supply on the transmitting side of the wireless power supply system and the control algorithm are required to be higher, namely, the requirement on a large-size and complex control algorithm is met. However, under some working conditions, the current phase-shifting control can cause the bridge arm switching tube with advanced phase to not meet the requirement of soft switching, so that the bridge arm switching tube has larger loss, serious heating, aggravated service life aging of the switching tube and thermal damage risk, and the existing solution is to use a large-margin device capable of meeting the thermal management and a large-margin heat dissipation condition, so that the bridge arm switching tube has great challenges for volume control and cost management of products, and does not meet the requirements and concepts of low carbon, low power consumption and small volume of the products.
Disclosure of Invention
The invention provides a wireless charging transmitting end adjusting method which is simple and convenient in adjusting mode, can be compatible with different working requirements, and has the characteristics of excellent power and small loss.
Wireless charging transmitting terminal adjusting method, and preset power battery charging voltage range is [ U ] bmin ，U bmax ]The method comprises the steps of carrying out a first treatment on the surface of the The minimum value of the input voltage of the inverter is preset as U dcmin The method comprises the steps of carrying out a first treatment on the surface of the Acquiring a charging voltage value U of a power battery b And an inverter input voltage value U dc To obtain gain voltage value G V Wherein G is V =U b / U dc The method comprises the steps of carrying out a first treatment on the surface of the The gain voltage value has a value range of [ G ] Vmin ，G Vmax ]The method comprises the steps of carrying out a first treatment on the surface of the Obtaining a minimum segment voltage value and a maximum segment voltage value according to the gain voltage value, wherein the minimum segment voltage value U smin =G Vmin ×U dcmin The method comprises the steps of carrying out a first treatment on the surface of the Maximum segment voltage value U smax =G Vmax ×U dcmin The method comprises the steps of carrying out a first treatment on the surface of the The minimum value, the minimum sectional voltage value and the maximum sectional voltage value of the input voltage of the inverter are all in a preset power battery charging voltage range, and the preset power battery charging voltage range is divided into four sections; charging voltage value U of power battery b Matching with the four intervals, and correspondingly adjusting if the intervals fall into different intervals; the common mode of the four inter-interval adjustment is to select at most two of the phase of the transmitting end, the control frequency and the input voltage of the inverter for adjustment.
Preferably, the four sections are respectively a first section to a fourth section; the first interval is U bmin ≤U b ＜U dcmin The adjusting method is as follows: control ofThe frequency is reduced, and the input voltage of the inverter is increased; the second interval is U dcmin ≤U b ＜U smin The adjusting method is as follows: adjusting the phase and controlling the frequency to rise; the third interval is U smin ≤U b ＜U smax The adjusting method is as follows: the control frequency increases; the fourth interval is U smax ≤U b ≤U bmax The adjusting method is as follows: the inverter input voltage increases.
Preferably, the second to fourth intervals are adjusted on the basis of the phase adjustment and the voltage adjustment; when the control frequency is adjusted, adjusting the result value of the previous interval; the first intervals are all adjusted on the basis of the values.
Preferably, the working frequency range of the transmitting end is 150KHz-260KHz, and the adjusting range of the control frequency is within the working frequency range of the transmitting end.
Preferably, the adjustment objective is to make: p (P) loss ≤P le And P is o = P e The method comprises the steps of carrying out a first treatment on the surface of the Wherein P is loss Is the loss power of the MOS tube in the inverter; p (P) le Is the loss rated power; p (P) o Is the actual power of the system; p (P) e Is the rated output power.
Preferably, the first interval is 250 V.ltoreq.U b The regulation method is less than 380V: the control frequency is reduced from 250KHz to 210KHz, and the input voltage of the inverter is increased from 380V to 500V; the second interval is 380V less than or equal to U b The regulation method is less than 650V, and the regulation method is as follows: the phase is advanced from 180 degrees to 136 degrees plus or minus 2 degrees, and the control frequency is increased from 210KHz to 235KHz; the third interval is 650V less than or equal to U b < 714V, the regulation method is: the control frequency is raised from 235KHz to 251KHz; the fourth interval is 714V less than or equal to U b The voltage is less than or equal to 950V, and the adjusting method is as follows: the inverter input voltage is raised from 380V to 470V 50V.
According to the wireless charging transmitting terminal adjusting method, different adjusting methods are adjusted according to the charging voltage value of the power battery, and two of the phase, the control frequency and the input voltage of the inverter of the transmitting terminal are adjusted. The three values are easy to adjust, safe and reliable, the whole method presets the charging voltage range of the fixed power battery, and the requirements of all electric vehicles on the market can be met for wireless charging of the electric vehicles.
Drawings
FIG. 1 is a flow chart of a wireless charging transmitting end adjusting method of the invention;
fig. 2 is a mechanism diagram corresponding to the wireless charging transmitting end adjusting method of the present invention.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
The invention discloses a wireless charging transmitting terminal adjusting method, which can be used for adjusting at most two phases of a transmitting terminal, a control frequency and an inverter input voltage so as to optimize the power of a wireless charging system, namely the loss power of an MOS tube in the inverter meets the target, as will be explained below. The regulation is based on the charging voltage U of the power battery b Is a value of (a).
Referring to FIG. 1, the method is embodied in a predetermined power cell charging voltage range [ U ] bmin ，U bmax ]The method comprises the steps of carrying out a first treatment on the surface of the The minimum value of the input voltage of the inverter is preset as U dcmin 。
These two values are available. Taking the wireless charging of an electric automobile as an example, the charging voltage range of a power battery of the vehicle is clear, and the charging voltage range of the power battery on the market is between 250V and 950V (including end point values). One embodiment of the present application is U bmin Take the value 250V, U bmax The value is 950V. It is necessary that the value is not a fixed value, and the range varies with the development of electric vehicles. The minimum value of the input voltage of the inverter is U dcmin The input voltage of the inverter is also a range value, which is [ U ] dcmin ，U dcmax ]The value is preferably U dcmin 400V, U dcmax 500V.
Acquiring a charging voltage value U of a power battery b Inverter input voltage value U satisfying control conditions dc These two values may be measured directly or by theoretical calculation. Comparing the two values to obtain a gain voltage value G V G, i.e V =U b / U dc . Further, the gain voltage value G V Also has a value range of [ G ] Vmin ，G Vmax ]The determination of this range is inversely proportional to the mutual inductance value M in the full resonance state.
In particular, in connection with the structure shown in FIG. 2, such as the LCC-S topology, G in the fully resonant state Vmin =L r1 /M max , G Vmax =L r1 /M min Wherein L is r1 Is the equivalent inductance value of the transmitting end, which can include the compensation inductance value and the inductance value of the transmitting coil L1, M max Is the maximum mutual inductance value, M min Is the minimum mutual inductance value. The mutual inductance value is related to the charging position, i.e. the alignment of the transmitting end and the receiving end affects the mutual inductance value.
Next, a minimum segment voltage value and a maximum segment voltage value are obtained according to the gain voltage value, wherein the minimum segment voltage value U smin =G Vmin ×U dcmin The method comprises the steps of carrying out a first treatment on the surface of the Maximum segment voltage value U smax =G Vmax ×U dcmin 。
And finally, the minimum value, the minimum sectional voltage value and the maximum sectional voltage value of the input voltage of the inverter are all in a preset power battery charging voltage range, and the preset power battery charging voltage range is divided into four sections by the three values.
The application is to charge the power battery with the voltage value U b Matching with four intervals, and according to the charging voltage value U of the power battery b The adjustment is carried out in different intervals, namely, the adjustment mode is that at most two of the phase, the control frequency and the input voltage of the inverter of the transmitting end are selected for adjustment. The adjustment objective is to make: p (P) loss ≤P le And P is o = P e The method comprises the steps of carrying out a first treatment on the surface of the Wherein P is loss Is the loss power of the MOS tube in the inverter; p (P) le Is the loss rated power; p (P) o Is the actual power of the system; p (P) e Is the rated output power.
The specific partition and the corresponding adjusting method are as follows:
the first interval is U bmin ≤U b ＜U dcmin The adjusting method is as follows: the control frequency decreases and the inverter input voltage increases.
The regulation method can be called as a phase-shifting-free frequency-reducing voltage-regulating control strategy. When the power battery voltage U is detected b During the first interval, the inverter input voltage U is given dc Is the minimum value U dcmin At this time, the lowest frequency f is given a (lowest frequency f of inverter) a ) Under the condition, the switching loss feedback is measured, if the switching loss P Loss Within the target, determining the actual output power P of the system o Whether or not the rated output power P is satisfied e If not, continuing to increase the input voltage U of the inverter dc (up to no more than U dcmax ) So that it meets the control objective, e.g. at the lowest frequency f if the control objective exceeds the nominal value during the step-up a The frequency is adjusted near the frequency point, and the step value is adjusted not to be too large, so that the control target is met.
The second interval is U dcmin ≤U b ＜U smin The adjusting method is as follows: the phase is adjusted and the control frequency is increased.
The method is called light phase shift constant voltage frequency modulation. When the voltage of the power battery is loaded to U dcmin When U dc Should be modulated to the minimum value U of the minimum inverter input voltage dcmin At this time, a slight phase shift is adopted to raise the frequency in a phase shift range, the frequency adjustment range gradually increases with the voltage of the load power battery and is monotonous, and the adjustment interval is (f a ,f b ) The control target is satisfied. f (f) b Is output as the resonant frequency under the characteristic of the voltage source, and is simply called the complete resonant frequency f b 。
The third interval is U smin ≤U b ＜U smax The adjusting method is as follows: the control frequency increases.
At this time when U dc Is the minimum value U dcmin In time, along with the mutual inductance change [ M ] min ,M max ]The state closest to the complete resonance and the output characteristic of the voltage source is controlled by adopting a mode of non-phase shifting, constant voltage and frequency modulation, and the frequency is regulated to be lower than the complete resonance frequency f b And approaches the full resonant frequency f b The approach here may be within a deviation of 5% as long as the control target is satisfied.
The fourth interval is U smax ≤U b ≤U bmax The adjusting method is as follows: the inverter input voltage increases.
At this time, the whole system is in complete resonance and the output characteristic is the voltage source, so the control mode of non-phase-shifting fixed-frequency voltage regulation is adopted. At this time, the control frequency is selected to be the complete resonant frequency f b By adjusting the inverter input voltage U dc So that it satisfies the control target.
The second interval to the fourth interval are regulated on the basis value when the phase and the voltage are regulated; when the control frequency is adjusted, adjusting the result value of the previous interval; the first intervals are all adjusted on the basis of the values.
The voltage value ranges of the four sections and the change of the adjustment object will be described below by taking a specific embodiment as an example.
The first interval is 250V less than or equal to U b The regulation method is less than 380V: the control frequency is reduced from 250KHz to 210KHz, and the inverter input voltage is increased from 380V to 500V.
The second interval is 380V less than or equal to U b The regulation method is less than 650V, and the regulation method is as follows: the phase advances from 180 deg. to 136 deg. + -2 deg., and the control frequency increases from 210KHz to 235KHz.
The third interval is 650V less than or equal to U b < 714V, the regulation method is: the control frequency is increased from 235KHz to 251KHz.
The fourth interval is 714V less than or equal to U b The voltage is less than or equal to 950V, and the adjusting method is as follows: the inverter input voltage is raised from 380V to 470V 50V.
It should be noted that in this application, the operating frequency range of the transmitting end is 150KHz-260KHz, and the range of the control frequency adjustment is within the operating frequency range of the transmitting end.
For better understanding, the following describes the entire wireless charging system with reference to fig. 2, which is divided into a transmitting end and a receiving end, the transmitting end is also called a ground end, and the receiving end is also called a vehicle end.
The transmitting terminal comprises a transmitting terminal rectifier 1, a transmitting terminal inverter 2, a transmitting terminal compensation circuit 3 and a transmitting coil L1 which are sequentially connected, and also comprises a transmitting terminal system controller 8 which comprises other necessary components of the transmitting terminal, such as a transmitting terminal controller, a transmitting terminal communicator, a transmitting terminal sampler and the like. The transmitting rectifier 1 is connected to a power source, which may be, for example, a mains supply.
The receiving end comprises a receiving coil L2, a receiving end compensation circuit 4, a receiving end rectifier 5, a filter circuit 6, a load of negative 7 and the like. Also included is a receiver-side controller 9, including for example a receiver-side sampler, a receiver-side controller, a receiver-side communicator, etc.
The transmitting-side controller 8 and the receiving-side controller 9 can communicate wirelessly.
The above-mentioned three adjustment of the phase, the control frequency and the input voltage of the inverter of the transmitting terminal are completed by the transmitting terminal controller 8, as indicated by arrow a in fig. 2, the adjustment of the input voltage of the inverter is indicated by arrow c, the adjustment of the control frequency is also indicated by arrow c, and the collection or calculation of the loss power of the MOS transistor in the inverter is also completed by the transmitting terminal controller 8, which is indicated by arrow b in fig. 2. Data concerning the part of the power battery, e.g. the power battery charge voltage value U b The power is collected by the receiving-end controller 9, and is indicated by an arrow d in fig. 2, and in addition to this, the power, state, temperature, etc. of the power battery are also collected by the receiving-end controller 9, and is indicated by an arrow e in fig. 2.
Based on the above description, the present application also has the following characteristics.
To achieve the above adjustment, M min /M max ＜1；U dcmin /U dcmax ＜1；U bmax /U bmin And is less than or equal to 4. And U is bmin ＜U dcmin ＜U dcmax ＜U bmax 。
While the foregoing is directed to embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.
Claims (5)
1. A wireless charging transmitting terminal adjusting method is characterized in that,
the charging voltage range of the preset power battery is [ U ] bmin ，U bmax ]The method comprises the steps of carrying out a first treatment on the surface of the The minimum value of the input voltage of the inverter is preset as U dcmin ；
Acquiring a charging voltage value U of a power battery b And an inverter input voltage value U dc To obtain gain voltage value G V Wherein G is V =U b / U dc The method comprises the steps of carrying out a first treatment on the surface of the The gain voltage value has a value range of [ G ] Vmin ，G Vmax ]；
Obtaining a minimum segment voltage value and a maximum segment voltage value according to the gain voltage value, wherein the minimum segment voltage value U smin =G Vmin ×U dcmin The method comprises the steps of carrying out a first treatment on the surface of the Maximum segment voltage value U smax =G Vmax ×U dcmin ；
The minimum value, the minimum sectional voltage value and the maximum sectional voltage value of the input voltage of the inverter are all in a preset power battery charging voltage range, and the preset power battery charging voltage range is divided into four sections;
charging voltage value U of power battery b Matching with the four intervals, and correspondingly adjusting if the intervals fall into different intervals; the common mode of the four inter-interval adjustment is that at most two of the phase of the transmitting end, the control frequency and the input voltage of the inverter are selected for adjustment;
the four sections are respectively a first section to a fourth section;
the first interval is U bmin ≤U b ＜U dcmin The adjusting method is as follows: the control frequency is reduced, and the input voltage of the inverter is increased;
the second interval is U dcmin ≤U b ＜U smin The adjusting method is as follows: adjusting the phase and controlling the frequency to rise;
the third interval is U smin ≤U b ＜U smax The adjusting method is as follows: the control frequency increases;
the fourth interval is U smax ≤U b ≤U bmax The adjusting method is as follows: the inverter input voltage increases.
2. The method for adjusting a wireless charging transmitting terminal according to claim 1, wherein,
the second interval to the fourth interval are regulated on the basis value when the phase and the voltage are regulated; when the control frequency is adjusted, adjusting the result value of the previous interval;
the first intervals are all adjusted on the basis of the values.
3. The method for adjusting a wireless charging transmitting terminal according to claim 1, wherein,
the working frequency range of the transmitting end is 150KHz-260KHz, and the adjusting range of the control frequency is within the working frequency range of the transmitting end.
4. The method for adjusting a wireless charging transmitting terminal according to claim 1, wherein,
the adjustment objective is to make: p (P) loss ≤P le And P is o = P e ；
Wherein P is loss Is the loss power of the MOS tube in the inverter; p (P) le Is the loss rated power; p (P) o Is the actual power of the system; p (P) e Is the rated output power.
5. The method for adjusting a wireless charging transmitting terminal according to claim 1, wherein,
the first interval is 250V less than or equal to U b The regulation method is less than 380V: the control frequency is reduced from 250KHz to 210KHz, and the inverter is inputThe voltage is increased from 380V to 500V;
the second interval is 380V less than or equal to U b The regulation method is less than 650V, and the regulation method is as follows: the phase is advanced from 180 degrees to 136 degrees plus or minus 2 degrees, and the control frequency is increased from 210KHz to 235KHz;
the third interval is 650V less than or equal to U b < 714V, the regulation method is: the control frequency is reduced from 235KHz to 251KHz;
the fourth interval is 714V less than or equal to U b The voltage is less than or equal to 950V, and the adjusting method is as follows: the inverter input voltage is raised from 380V to 470V 50V.
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| WO2020124549A1 (en) * | 2018-12-21 | 2020-06-25 | Oppo广东移动通信有限公司 | Wireless charging method, device to be charged, power supply device, and storage medium |
| CN110635546B (en) * | 2019-09-18 | 2021-11-30 | 华为数字能源技术有限公司 | Wireless charging electronic equipment, method and system |
| CN110803039B (en) * | 2019-12-04 | 2021-07-27 | 郑州轻工业大学 | Wireless charging full-working-condition coordination control method based on SS (service system) topology coupling mechanism |
| CN112448446B (en) * | 2020-11-11 | 2023-06-20 | 许继集团有限公司 | Static wireless charging method and system for electric automobile |
| CN112421790B (en) * | 2021-01-21 | 2021-05-28 | 深圳赫兹创新技术有限公司 | Derating control method and device for wireless charging system and wireless charging system |
| CN115149666A (en) * | 2021-03-31 | 2022-10-04 | 欧姆龙株式会社 | Wireless charging system, transmitting side charging device and receiving side charging device |
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