CN110752638B - Vehicle-mounted wireless charging controller - Google Patents
Vehicle-mounted wireless charging controller Download PDFInfo
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- CN110752638B CN110752638B CN201911036567.3A CN201911036567A CN110752638B CN 110752638 B CN110752638 B CN 110752638B CN 201911036567 A CN201911036567 A CN 201911036567A CN 110752638 B CN110752638 B CN 110752638B
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- temperature
- temperature threshold
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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
Abstract
The invention relates to a vehicle-mounted wireless charging controller for wireless charging of a device to be charged, comprising: a housing for supporting the device to be charged; a coil disposed on a side of the housing remote from the device to be charged and in thermal contact with the side of the housing; and a temperature detection module for detecting a first temperature of the housing on a side close to the coil, characterized in that the vehicle-mounted wireless charging controller further comprises a main calculation module for calculating a second temperature of the housing on a side close to the device to be charged based on the first temperature measurement value from the temperature detection module, the physical parameter related to the housing, and the heat conduction power value related to the coil.
Description
Technical Field
The present invention relates to an in-vehicle wireless charging system, and more particularly to a wireless charging controller for the in-vehicle wireless charging system.
Background
Many on-board wireless charging systems currently on the market have a wireless charging controller (WLC, or wireless charger) to wirelessly charge a mobile terminal wireless charging device. Wireless charging controllers are typically designed in the form of a flat housing with a thickness that houses a printed circuit board (PCB board). One side of the shell is provided with a coil, and the other side of the shell is used for placing the wireless charging equipment of the mobile terminal. The wireless charging controller identifies relevant information such as the model number or the electric quantity of the parked charging equipment, and responds to the instruction of the user to start the charging mode. During charging, the coil is operated to generate heat, which is transferred by heat conduction to the support surface of the housing for the charging device to rest on, which is facing and easily accessible to the user, and the wireless charging controller monitors and controls the temperature of the housing for safety reasons.
Existing wireless charging controllers typically implement a predetermined temperature control strategy in which certain control parameters, such as the temperature difference between the temperature of the side of the housing where the coil is disposed (inner face temperature) and the temperature of the bearing surface of the housing (outer face temperature), are set to a fixed value that is derived based on partial test results of the wireless charging controller product type. For example, the internal and external temperature difference is generally set to 10 degrees (deg.c) constantly, and when the safety temperature threshold for the external temperature is set to 60 degrees, the safety temperature threshold for the internal temperature is set to 70 degrees constantly.
The difference between the internal and external temperatures is not a constant value according to the actual working environment, for example, the difference is changed along with the change of parameters such as electric power, thickness of the wireless charging controller product and the like. The internal temperature threshold value determined based on the constant value of the difference between the internal and external temperatures is not accurate, and the most serious consequence of this temperature control method is the possibility of causing a safety accident. For example, as described above, the internal and external temperature difference is constantly set to 10 degrees, the existing wireless charging controller sets the safety temperature threshold of the external temperature to 60 degrees, the safety temperature threshold of the internal temperature to 70 degrees, and the actual internal and external temperature difference may be 3 degrees under certain conditions, when the internal temperature exceeds 63 degrees and does not reach the internal safety temperature threshold of 70 degrees, the actual external temperature exceeds the safety temperature threshold of 60 degrees, and the existing wireless charging controller does not start the protection measures at this time, so that there is a great potential safety hazard and personal injury is very easy to cause.
Accordingly, the present invention is directed to overcoming one or more of the problems set forth above.
Disclosure of Invention
In view of the above-described object, the present invention provides a wireless charging controller for an in-vehicle wireless charging system, which enables the outside temperature of the controller to be monitored dynamically and reliably without affecting the beauty and the ease of use, improving the system safety.
According to an aspect of the present invention, there is provided an in-vehicle wireless charging controller for wireless charging of a device to be charged, comprising: a housing for supporting the device to be charged; a coil for generating an induced current in the device to be charged, the coil being disposed in the housing on a side of the housing remote from the device to be charged and in thermal contact with the side of the housing; and a temperature detection module for detecting a first temperature of the housing on a side close to the coil, characterized in that the vehicle-mounted wireless charging controller further comprises a main calculation module for calculating a second temperature of the housing on a side close to the device to be charged based on the first temperature measurement value from the temperature detection module, the physical parameter related to the housing, and the heat conduction power value related to the coil.
Advantageously, the vehicle-mounted wireless charging controller further comprises a charging control module for controlling the current charging mode based on a comparison of the calculated second temperature with a predetermined temperature threshold.
Advantageously, the charging control module controls the current charging mode to be a full-speed charging mode when the second temperature is less than the first temperature threshold, and controls the current charging mode to be a limited charging mode when the second temperature is greater than or equal to the first temperature threshold and less than the second temperature threshold, the second temperature threshold being greater than the first temperature threshold.
Advantageously, the charge control module controls the current charge mode to a stop charge mode when the second temperature is greater than or equal to a second temperature threshold.
Advantageously, when the current charging mode is the stop charging mode, the charging control module continuously determines whether the second temperature is reduced to a third temperature threshold, and when the second temperature is less than the third temperature threshold, restarts wireless charging and controls the current charging mode to be the power charging mode, wherein the third temperature threshold is greater than or equal to the first temperature threshold but less than the second temperature threshold.
Advantageously, when the current charging mode is the stop charging mode, the charging control module continuously determines whether the second temperature is reduced to a fourth temperature threshold, and when the second temperature is less than the fourth temperature threshold, the current charging mode is controlled to exit the power-limited charging mode and enter the full-speed charging mode, and the fourth temperature threshold is less than or equal to the first temperature threshold.
Advantageously, the first temperature threshold is 49 degrees, the second temperature threshold is 60 degrees, the third temperature threshold is 50 degrees, and the fourth temperature threshold is 45 degrees.
Advantageously, in the limited charge mode, the charge control module limits the charge power to a first value when the second temperature is greater than the first temperature threshold but less than the predetermined phase temperature threshold, and limits the charge power to a second value when the second temperature is greater than the phase temperature threshold, the second value being less than the first value.
Advantageously, the calculation of the second temperature is performed periodically at predetermined time intervals.
Advantageously, the device to be charged comprises a smart phone, a tablet computer or an electronic book.
Therefore, based on the invention, theoretical dynamic calculation is carried out on the temperature difference between the inside and the outside of the vehicle-mounted wireless charging controller, and the accurate outside temperature of the vehicle-mounted wireless charging controller shell is obtained, so that the problem of personal injury caused by inaccurate monitoring of the outside temperature of the existing vehicle-mounted wireless charging controller is solved, and a more accurate judgment basis is provided for reliable wireless charging flow control. In addition, the vehicle-mounted wireless charging controller can flexibly and reliably control the wireless charging flow, so that the safety and reliability of the whole system are further improved, and the service life of the system is prolonged.
Drawings
Features and advantages of one example of the invention will become apparent with reference to the following detailed description and accompanying drawings in which:
FIG. 1 shows a schematic diagram of an on-board wireless charging system; and
FIG. 2 illustrates a simplified diagram of a portion of an on-board wireless charging system incorporating an on-board wireless charging controller of an embodiment of the present invention;
FIG. 3 shows a block diagram of an on-board wireless charging controller according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a control flow of the vehicle-mounted wireless charging controller according to the embodiment of the invention; and
fig. 5 shows a simplified schematic diagram of a "limited charge mode" or "limited power mode" of a wireless charging system according to an embodiment of the 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 and intended to explain the present invention and should not be construed as limiting the invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated.
An in-vehicle wireless charging system for a mobile terminal according to an embodiment of the present invention is described below with reference to the accompanying drawings. The vehicle-mounted wireless charging system can be applied to an electric automobile, and the electric automobile can be a pure electric automobile or a hybrid electric automobile.
As shown in fig. 1 and 2, an in-vehicle wireless charging system 10 according to an embodiment of the present invention includes: a device to be charged 100 and an electric power supply apparatus 200. The power supply apparatus 200 (i.e., an in-vehicle wireless charging device) is mounted on an electric vehicle, and in the above example, the device to be charged 100 includes, but is not limited to: smart phones, tablet computers, electronic books, etc. Specifically, the electric power supply device is configured to enter a wireless charging process in response to a charging request from the device to be charged, for example, to transmit electric power to the device to be charged using electromagnetic induction.
The working principle of the vehicle-mounted wireless charging system 10 according to the embodiment of the invention is described by taking the wireless charging mode as an electromagnetic induction principle as an example: an alternating magnetic field is generated by the primary coil of the power supply device 200, and a corresponding component (e.g., a secondary coil) of the device to be charged 100 generates an induced current in the alternating magnetic field, thereby realizing transmission of power to the device to be charged 100 to realize charging of a storage battery of the device to be charged.
The power supply apparatus 200 includes an in-vehicle wireless charging controller 210 configured to control a communication connection between the power supply apparatus 200 and the device 100 to be charged, for controlling progress of a wireless charging process.
In the embodiment of the present invention shown in fig. 2, the in-vehicle wireless charging controller 210 is shown to include a flat housing 211 having a thickness L, with a PCB board 212 contained therein. The PCB board is used for being connected with components such as a power supply or a test circuit and the like and is used for collecting current or integrating various control modules. In the illustrated embodiment, the in-vehicle wireless charging controller 210 also includes a coil 220 disposed in the housing and located on a side of the housing remote from the device to be charged. The coil 220 is in thermal contact with the side of the housing. On the opposite side of the housing from the coil 220, serves as a support surface for supporting the device to be charged 100. Thus, the opposite side of the housing from the coil 220 is easily accessible to the user. For simplicity of description, the user facing side of the housing is the outside and the side of the housing facing away from the user is the inside.
The term "thermal contact" herein means that a thermal connection is formed between two components that are in thermal contact such that heat flow can circulate along the heat flow channels formed. Therefore, the thermal contact between the coil and the case is not limited to the physical close contact, and may include thermal connection between the two by a heat conductive member such as a heat conductive adhesive. In the embodiment shown in the invention, the coil is arranged on the inner side of the housing wall, so that the heat flow generated by the coil is transferred to the other side of the housing, which is remote from the coil, substantially in a predetermined direction.
In fig. 2 of the present invention, the coil of the side of the housing 211 facing away from the user is shown as being visible from the outside for convenience of explanation, but it is easily conceivable for those skilled in the art to package the coil 220 on the side of the housing 211 facing away from the user so as to become invisible from the outside. Accordingly, the coil 220 may be integrated with the housing 211 or the PCB 212.
In the embodiment of the invention shown in fig. 3, the in-vehicle wireless charging controller 210 further comprises a temperature detection module 231 for measuring the internal temperature Ts of the housing and a main calculation module 232, the main calculation module 232 being configured to calculate the external temperature Te of the housing based on the measured value of the internal temperature Ts from the temperature detection module 231, the physical parameters related to the housing and the heat conduction power value related to the coil.
The main computing module 232 is integrated on the PCB board 212, enhancing the compactness and aesthetics of the on-board wireless charging controller. The temperature detection module 231 can be arranged in the shell according to actual requirements, and can also be arranged outside the shell.
The main computing module 232 of the in-vehicle wireless charging controller according to the present invention may be designed as a computing device readable storage medium storing a predetermined computing program. The calculation program may be designed to: taking the example shown in fig. 2, the physical parameters of the housing 211 are called or input, including the thermal conductivity lambda of the housing 211, the thickness L of the housing 211, and the orientation of the housing 211 to be chargedThe side area of the device (i.e., heat transfer area) s=xy, where x and y are the length and width, respectively, of the sides of housing 211; measuring and calculating the current heat transfer power Pt associated with the coil, wherein heat transfer power pt=i 2 * The ESR, I being the current of the coil 220 as the main heat source of the power supply device, is the equivalent resistance of the coil 220, which can be measured by a measuring circuit provided on the PCB board 212. The electrical power of the coil 220 is ideally considered to be entirely converted into thermal power. The conversion coefficient from electric power to thermal power conversion may be additionally set as the case may be, to calculate the outside temperature Te of the case more accurately.
From the fourier law, it can be deduced that: the temperature difference between the inner face temperature Ts and the outer face temperature Te Δtx=ts-te= (L/λs) ×pt.
The calculation module dynamically calculates Δtx in real time according to the above formula and thus derives the outside temperature Te. For example, the temperature differences Δtx and Te are periodically calculated and recorded at intervals of 500 ms.
For convenience of explanation, only one temperature measurement point for Ts is schematically shown in the drawings of the present invention in the region of the center position of the coil. A person skilled in the art can arrange a plurality of temperature sensors at different positions on the periphery of the coil to measure the temperature of the inner face of the housing according to the actual space design requirements. The measured inner face temperature values can be used for calculating the inner face temperature in the central position area of the coil by adopting a certain algorithm, and the outer face temperature of one side of the supporting face of the shell at the corresponding position can be calculated by using the inner face temperature values. Accordingly, the number of temperature sensors included in the temperature detection module 231 may be two or more.
The in-vehicle wireless charging controller 210 according to the present invention further includes a charging control module 233 for controlling a current charging mode based on a comparison result of the calculated outside temperature Te with a predetermined temperature threshold. Referring to fig. 4, a charge control strategy performed by the in-vehicle wireless charge controller according to the present invention is shown.
At step S401, the temperature Te is periodically calculated and recorded at predetermined intervals, e.g., 500ms, and the charge control module periodically compares the temperature Te with a predetermined first temperature threshold (e.g., 49 degrees) at corresponding intervals at step S402.
At step S402, when Te is less than the first temperature threshold Ty1 (e.g., 49 degrees), the charge control module generates an instruction of a full-speed charge mode, which is transmitted to a coil control circuit in the PCB board to change the current intensity induced in the device to be charged by the alternating magnetic field in the coil, i.e., increase the charge power to a maximum of, e.g., 15w (step S403). Then, at step S411, it is judged whether the device to be charged is fully charged at predetermined time intervals, if so, the wireless charging flow is exited, otherwise, the process loops to step S401 to continue calculating and monitoring the temperature Te.
At step S402, when Te is equal to or greater than the first temperature threshold, the flow advances to step S404. At step S404, the magnitudes of Te and a predetermined second temperature threshold Ty2 (e.g., 60 degrees) are compared. When Te is less than a predetermined second temperature threshold (e.g., 60 degrees), the charge control module controls the charge mode to a limited charge mode (i.e., step S405). Referring to fig. 5, in the limited charge mode, the charge control module changes the charge power according to the comparison result of Te and the phase temperature threshold Tpy. For example, taking the phase temperature threshold Tpy as 53 degrees, when Te is less than 53 degrees, the charge control module controls the charge power to a larger charge power, for example 7w. When Te is 53 degrees or more, the charge control module controls the charge power to a smaller charge power, for example, 3.5w.
At step S404, the charging flow proceeds to step S406 when Te is equal to or greater than the second temperature threshold Ty2 (e.g., 60 degrees), wherein the charging control module controls the charging mode to the stop charging mode. In the stop charging mode, the coil stops working and no induced current is generated in the device to be charged.
After the "stop charge mode" is started, the outside temperature Te of the case gradually decreases with time. Every 500ms a new Te is called from the main calculation module by the charge control module.
At step S407, when Te falls below the charge recovery threshold temperature Ty3 (e.g., 50 degrees), the flow proceeds to step S408, i.e., the charging is restarted, but the charging is performed in the "limited power mode". That is, charging is performed with a larger charging power, for example, 5w, when Te is less than the recovery phase threshold temperature (for example, 48 degrees), and charging is performed with a smaller charging power, for example, 2w, when Te is equal to or greater than the recovery phase threshold temperature (for example, 48 degrees). If Te is equal to or higher than the charge recovery threshold temperature Ty3, the process proceeds to step S406, and the "stop charge mode" is entered.
During operation in the "limited power mode" of the charge recovery phase, te is compared with the charge recovery threshold temperature Ty3 at step S409, and if Te is less than Ty3, then it proceeds to compare Te with the full recovery temperature threshold Ty4 at step S410. If Te is equal to or greater than Ty3, the process proceeds to step S406, where the "power limit mode" is exited, and the "stop charge mode" is entered.
At step S410, when the outside temperature Te of the case is less than the full recovery temperature threshold Ty4 (for example, 45 degrees), step S403 is performed, i.e., the "limited power mode" is exited, and the "full speed charge mode" is entered. And when the outside temperature Te of the case is equal to or higher than the charge restoration threshold temperature Ty4, the process returns to step S408 to charge in the "limited power mode".
Referring to fig. 4, in any of the "full-speed charge mode", "limited charge mode", and "stop charge mode", the case outside temperature Te is periodically calculated at predetermined time intervals, for example, 500ms, and the charging process of the wireless charging system is continuously circulated until the charging is completed according to the flow shown in fig. 4. During the whole charging process, the outside temperature Te is dynamically calculated in real time, so that the outside temperature Te of the shell is ensured to be within a safe range, and the risk of safety accidents is reduced.
In addition, the vehicle-mounted wireless charging controller provided by the invention can save the need of arranging temperature sensing outside the shell, enhance the attractive appearance and the use convenience of the vehicle-mounted wireless charging controller, save the calibration test work of a large number of sensors, and be applicable to all other vehicle-mounted wireless charging products, and has high reusability.
In this context, the "limited charge mode" and the "limited power mode" of the charge recovery phase may be substantially controlled identically, both in stages or in stages, with different charge powers, ensuring that no steep increase in the outside temperature Te occurs to fall within an uncontrollable range, thus improving the control reliability. Although only one phase threshold is shown in fig. 5 to divide the charging flow into two stages. It will be readily apparent to those skilled in the art that multiple levels of power may be used for control, ensuring control refinement and enhancing reliability of control.
Logic and/or steps represented in control flow diagrams 4 and 5, or otherwise described herein, e.g., a ordered listing of executable instructions for implementing logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device.
It is to be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing module, or each unit may exist alone physically, or two or more units may be integrated in one module. The integrated modules may be implemented in hardware or in software functional modules.
What has been described above is merely an exemplary embodiment of an in-vehicle wireless charging system and an in-vehicle wireless charging controller according to the present invention. The in-vehicle wireless charging system and the in-vehicle wireless charging controller are not limited to the specific embodiments described herein. Reference throughout this specification to "one example," "another example," "an example," and so forth, means that a particular element/feature (e.g., feature, structure, and/or characteristic) described in connection with the example is included in at least one example described herein, and may or may not be present in other examples. Additionally, it is to be understood that the elements of any of the examples described may be combined in any suitable manner in a number of different examples unless the context clearly indicates otherwise.
The patentable scope of the invention is defined by the claims, and may include other examples that occur to those skilled in the art. Such other examples are intended to be within the scope of the claims if they have structural elements that do not differ from the literal language of the claims, or if they include equivalent structural elements with insubstantial differences from the literal languages of the claims.
Claims (10)
1. An on-vehicle wireless charging controller for wireless charging of a device to be charged, comprising: a housing for supporting the device to be charged; a coil for generating an induced current in the device to be charged, the coil being disposed in the housing on a side of the housing remote from the device to be charged and in thermal contact with the side of the housing; and a temperature detection module for detecting a first temperature of a side of the housing close to the coil,
the vehicle-mounted wireless charging controller is characterized by further comprising a main calculation module, wherein the main calculation module is used for calculating a second temperature of one side of the shell, which is close to the equipment to be charged, based on the first temperature measured value from the temperature detection module, the physical parameter related to the shell and the heat conduction power value related to the coil;
the main computing module is specifically configured to: and calculating a second temperature Te according to Ts-Te= (L/λs) Pt, wherein Ts is a first temperature measurement value, L is the thickness of the shell, λ is the heat conductivity coefficient of the shell, s is the heat transfer area of the shell, and Pt is the heat conduction power value related to the coil.
2. The vehicle-mounted wireless charging controller of claim 1, further comprising a charging control module for controlling a current charging mode based on a comparison of the calculated second temperature to a predetermined temperature threshold.
3. The vehicle-mounted wireless charging controller of claim 2, wherein the charging control module controls the current charging mode to a full-speed charging mode when the second temperature is less than the first temperature threshold, and controls the current charging mode to a limited charging mode when the second temperature is greater than or equal to the first temperature threshold and less than the second temperature threshold, the second temperature threshold being greater than the first temperature threshold.
4. The vehicle-mounted wireless charging controller of claim 3, wherein the charging control module controls the current charging mode to a stop charging mode when the second temperature is greater than or equal to a second temperature threshold.
5. The vehicle-mounted wireless charging controller of claim 4, wherein the charging control module continuously determines whether the second temperature decreases to a third temperature threshold when the current charging mode is a stop charging mode, and restarts wireless charging and controls the current charging mode to be a power charging mode when the second temperature is less than the third temperature threshold, the third temperature threshold being greater than or equal to the first temperature threshold but less than the second temperature threshold.
6. The vehicle-mounted wireless charging controller of claim 5, wherein the charging control module continuously determines whether the second temperature decreases to a fourth temperature threshold when the current charging mode is a stop charging mode, and controls the current charging mode to exit the limited power charging mode and enter a full speed charging mode when the second temperature is less than the fourth temperature threshold, the fourth temperature threshold being less than or equal to the first temperature threshold.
7. The vehicle-mounted wireless charging controller of claim 6, wherein the first temperature threshold is 49 degrees, the second temperature threshold is 60 degrees, the third temperature threshold is 50 degrees, and the fourth temperature threshold is 45 degrees.
8. The vehicle-mounted wireless charge controller of claim 3, wherein in the limited charge mode, the charge control module limits the charge power to a first value when the second temperature is greater than the first temperature threshold but less than the predetermined phase temperature threshold, and limits the charge power to a second value when the second temperature is greater than the phase temperature threshold, the second value being less than the first value.
9. The vehicle-mounted wireless charging controller according to any one of claims 1-8, wherein the calculation of the second temperature is performed periodically at predetermined time intervals.
10. The vehicle-mounted wireless charging controller according to one of claims 1-8, wherein the device to be charged comprises a smart phone, a tablet computer or an electronic book.
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| CN114374307A (en) * | 2021-04-30 | 2022-04-19 | 华为数字能源技术有限公司 | Temperature protection method and device of vehicle-mounted charger and vehicle-mounted charger |
| WO2024000539A1 (en) * | 2022-06-30 | 2024-01-04 | 北京小米移动软件有限公司 | Wireless charging apparatus and wireless charging control method |
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| TW201223063A (en) * | 2010-09-09 | 2012-06-01 | Panasonic Elec Works Co Ltd | Non-contact power feeding device |
| CN107112775A (en) * | 2015-01-14 | 2017-08-29 | 奥迪股份公司 | The method transmitted the charging equipment of electric energy for induction type and run charging equipment |
| CN108199491A (en) * | 2018-01-10 | 2018-06-22 | 上海惠芽信息技术有限公司 | A kind of charging module and the wireless charging system with the charging module |
| WO2019170838A1 (en) * | 2018-03-08 | 2019-09-12 | Mahle International Gmbh | Induction charging device |
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| TW201223063A (en) * | 2010-09-09 | 2012-06-01 | Panasonic Elec Works Co Ltd | Non-contact power feeding device |
| CN107112775A (en) * | 2015-01-14 | 2017-08-29 | 奥迪股份公司 | The method transmitted the charging equipment of electric energy for induction type and run charging equipment |
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