CN110752638A - Vehicle-mounted wireless charging controller - Google Patents
Vehicle-mounted wireless charging controller Download PDFInfo
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- CN110752638A CN110752638A CN201911036567.3A CN201911036567A CN110752638A CN 110752638 A CN110752638 A CN 110752638A CN 201911036567 A CN201911036567 A CN 201911036567A CN 110752638 A CN110752638 A CN 110752638A
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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
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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 a device to be charged; a coil disposed on a side of the housing away 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 in close proximity to the coil, characterized in that the in-vehicle wireless charging controller further includes a main calculation module for calculating a second temperature of the side of the housing close to the device to be charged based on a first temperature measurement value from the temperature detection module, a physical parameter related to the housing, and a 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) for wirelessly charging a mobile terminal wireless charging device. Typically, wireless charging controllers are designed in the form of a flat housing with a certain thickness, which houses a printed circuit board (PCB board). And a coil is arranged on one side of the shell, and the other side of the shell is used for placing the mobile terminal wireless charging equipment. The wireless charging controller identifies relevant information such as the model or the electric quantity of the parked charging device and starts the charging mode in response to an instruction of a user. During charging, the coil generates heat, the generated heat is transferred to a supporting surface of the shell for placing the charging equipment in a heat conduction mode, the supporting surface faces a user and is easily accessible to the user, and the wireless charging controller monitors and controls the temperature of the shell for safety.
Existing wireless charge 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 provided (the inside face temperature) and the temperature of the bearing face of the housing (the outside face temperature), are set to a fixed value that is derived based on partial test results for the wireless charge controller product type. For example, the inside-outside temperature difference is normally constantly set to 10 degrees (° c), and when the safe temperature threshold for the outside temperature is set to 60 degrees, the safe temperature threshold for the inside temperature is constantly set to 70 degrees.
According to the actual working environment, the internal and external temperature difference is not a constant value, and changes along with the changes of parameters such as electric power, thickness of the wireless charging controller product and the like. The internal temperature threshold determined based on the constant value of the difference between the internal temperature and the external temperature is not accurate, and the most serious consequence of the temperature control method is that a safety accident may be caused. For example, as described above, the internal and external temperature difference is constantly set to 10 degrees, the conventional wireless charging controller sets the safe temperature threshold of the external temperature to 60 degrees, the safe 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 safe temperature threshold of 70 degrees, the actual external temperature already exceeds the safe temperature threshold of 60 degrees, and the conventional wireless charging controller does not start the safeguard measure at this time, so that there is a great potential safety hazard and personal injury is very likely to occur.
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, the present invention provides a wireless charging controller for an in-vehicle wireless charging system, which enables dynamically and reliably monitoring the outside temperature of the controller without affecting the beauty and convenience 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, including: a housing for supporting a 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 in close proximity to the coil, characterized in that the in-vehicle wireless charging controller further includes a main calculation module for calculating a second temperature of the side of the housing close to the device to be charged based on a first temperature measurement value from the temperature detection module, a physical parameter related to the housing, and a heat conduction power value related to the coil.
Advantageously, the in-vehicle wireless charging controller further comprises a charging control module for controlling a 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 the full-speed charging mode when the second temperature is less than a first temperature threshold, and controls the current charging mode to be the limited charging mode when the second temperature is greater than or equal to the first temperature threshold and less than a second temperature threshold, the second temperature threshold being greater than the first temperature threshold.
Advantageously, the charging control module controls the current charging mode to be the stop charging 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, the wireless charging is restarted and the current charging mode is controlled to be the power-limited charging mode, and 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 lower than the fourth temperature threshold, the charging control module controls the current charging mode to exit the power-limited charging mode and enter the full-speed charging mode, and the fourth temperature threshold is lower 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 charging mode, the charging control module limits the charging power to a first value when the second temperature is greater than the first temperature threshold but less than a predetermined phase temperature threshold, and limits the charging 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 smartphone, a tablet computer or an electronic book.
Therefore, based on the invention, the temperature difference between the inside and the outside of the vehicle-mounted wireless charging controller is theoretically and dynamically calculated to obtain the accurate external surface temperature of the vehicle-mounted wireless charging controller shell, the problem of personal injury caused by inaccurate external surface temperature monitoring of the conventional 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 process, further improve the safety and reliability of the whole system and prolong the service life of the system.
Drawings
Features and advantages of an example of the present invention will become apparent by reference to the following detailed description and drawings, in which:
FIG. 1 shows a schematic diagram of an in-vehicle wireless charging system; and
fig. 2 shows a simplified diagram of a portion of an in-vehicle wireless charging system incorporating an in-vehicle wireless charging controller of an embodiment of the present invention;
FIG. 3 shows a block schematic diagram of an in-vehicle wireless charging controller of an embodiment of the present invention;
fig. 4 is a control flow diagram of an in-vehicle wireless charging controller according to an embodiment of the present invention; and
fig. 5 shows a simplified schematic diagram of a "limited charging mode" or a "limited power mode" of a wireless charging system of an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying 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 one 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., the vehicle-mounted 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, and the like. In particular, the 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, by transferring 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 present invention is described by taking a 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, so that power transmission to the device to be charged 100 is realized to charge the storage battery of the device to be charged.
The power supply device 200 includes an onboard wireless charging controller 210 configured to control a communication connection between the power supply device 200 and the device to be charged 100 for controlling the progress of the wireless charging process.
In the embodiment of the present invention illustrated in fig. 2, the onboard wireless charging controller 210 is shown to include a flat housing 211 having a thickness L, within which is housed a PCB board 212. The PCB is connected with a power supply or a test circuit and other components, and is used for collecting current or integrating various control modules. In the illustrated embodiment, the in-vehicle wireless charging controller 210 further includes a coil 220 disposed in the housing and located on a side of the housing away from the device to be charged. The coil 220 is in thermal contact with the side of the housing. On the side of the housing opposite the coil 220 serves as a support surface for supporting the device 100 to be charged. Thus, the side of the housing opposite the coil 220 is easily accessible to the user. For simplicity of description, the side of the housing facing the user is the outer side, and the side of the housing facing away from the user is the inner side.
Herein, the term "thermal contact" means that a thermal connection is formed between two components that are in thermal contact, so that a heat flow can circulate along the formed heat flow channel. Therefore, the thermal contact between the coil and the housing is not limited to the physical close contact, but may include a thermal connection between the two by a heat conductive member such as a heat conductive paste. In the shown embodiment of 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 substantially in a predetermined direction to the other side of the housing remote from the coil.
For ease of illustration in fig. 2 of the present invention, the coil on the side of the housing 211 facing away from the user is shown as being externally visible, however, one skilled in the art would readily appreciate that the coil 220 is enclosed on the side of the housing 211 facing away from the user and becomes externally invisible. Accordingly, the coil 220 may be integrated with the housing 211 or the PCB 212.
In the embodiment of the present invention shown in fig. 3, the in-vehicle wireless charging controller 210 further includes a temperature detection module 231 for measuring the inside surface temperature Ts of the case, and a main calculation module 232, the main calculation module 232 being configured to calculate the outside surface temperature Te of the case based on the measured value of the inside surface temperature Ts from the temperature detection module 231, the physical parameter related to the case, 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 aesthetic appearance of the in-vehicle wireless charging controller. The temperature detection module 231 may be disposed in the housing or outside the housing according to actual requirements.
The main calculation 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 calculation program. The computer program may be designed to: taking fig. 2 as an example, physical parameters of the housing 211 are retrieved or input, including a thermal conductivity λ of the housing 211, a thickness L of the housing 211, and an area (i.e., a heat transfer area) S of a side surface of the housing 211 facing the device to be charged, where x and y are a length and a width of the side surface of the housing 211, respectively; measuring and calculating the current heat conduction power Pt related to the coil, wherein the heat conduction power Pt is I2ESR, where I is the current of the coil 220 as the main heat generating source of the electric energy providing device, and ESR is the equivalent resistance of the coil 220, which can be measured by a measuring circuit disposed on the PCB board 212. Ideally, the electrical power of the coil 220 is considered to be fully converted to thermal power. A conversion coefficient from electric power to thermal power may be additionally set as the case may be to more accurately calculate the outside temperature Te of the case.
From the fourier law, one can deduce that: the temperature difference Δ Tx between the inner surface temperature Ts and the outer surface temperature Te is Ts — Te (L/λ s) × Pt.
The calculation module dynamically calculates Δ Tx and hence the outside temperature Te in real time according to the above formula. The temperature differences Δ Tx and Te are periodically calculated and recorded with an interval time of 500ms, for example.
For the sake of illustration, the present invention is shown schematically in the drawings with only one temperature measurement point for Ts located in the central region of the coil. Those skilled in the art can arrange a plurality of temperature sensors at different positions on the periphery of the coil to measure the inner surface temperature of the shell according to the actual space design requirement. The measured inner surface temperature values may be calculated by a predetermined algorithm to calculate the inner surface temperature of the coil center region, or may be calculated by using the inner surface temperature values to calculate the outer surface temperature of the support surface side of the case at the corresponding position. Therefore, the number of the 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 the current charging mode based on the comparison result of the calculated outside temperature Te with a predetermined temperature threshold. Referring to fig. 4, a charging control strategy executed by the in-vehicle wireless charging 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 charging 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 smaller than the first temperature threshold Ty1 (e.g. 49 degrees), the charging control module generates an instruction of the full-speed charging mode, which is transmitted to the coil control circuit in the PCB board to change the intensity of the current induced in the device to be charged by the alternating magnetic field in the coil, i.e. to increase the charging power to a maximum of, for example, 15w (step S403). Then, it is determined at step S411 at predetermined time intervals whether the device to be charged is fully charged, and if so, the wireless charging flow is exited, otherwise, it loops to step S401 to continue calculating and monitoring the temperature Te.
At step S402, when Te is equal to or higher than the first temperature threshold, the flow advances to step S404. At step S404, Te is compared with a predetermined second temperature threshold Ty2 (e.g., 60 degrees) in magnitude. When Te is less than a predetermined second temperature threshold (e.g., 60 degrees), the charging control module controls the charging mode to the limited charging mode (i.e., step S405). Referring to fig. 5, in the limited charging mode, the charging control module changes the charging power according to the comparison result of Te with the phase temperature threshold Tpy. For example, taking the phase temperature threshold Tpy to be 53 degrees, when Te is less than 53 degrees, the charging control module controls the charging power to a larger charging power, for example, 7 w. When Te is 53 degrees or more, the charging control module controls the charging power to a smaller charging power, for example, 3.5 w.
At step S404, when Te is equal to or greater than the second temperature threshold Ty2 (e.g., 60 degrees), the charging flow proceeds to step S406, where the charging control module controls the charging mode to a 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 charging 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 charging 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 is charged in the "power limited 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). On the other hand, if Te is equal to or higher than the charge resumption threshold temperature Ty3, the process proceeds to step S406, and the "stop charging mode" is entered.
During operation in the "power limited mode" of the charge restoration phase, Te and the charge restoration threshold temperature Ty3 are compared at step S409, and if Te is less than Ty3, then proceeding to step S410 to compare Te and the full restoration temperature threshold Ty 4. On the other hand, if Te is equal to or greater than Ty3, the process proceeds to step S406, i.e., exits the "power limit mode" and enters the "stop charging mode".
When the outside temperature Te of the case is less than the full recovery temperature threshold Ty4 (e.g., 45 degrees) at step S410, step S403 is performed, i.e., the "power limit mode" is exited and the "full-speed charging mode" is entered. When the outside temperature Te of the case is equal to or higher than the charge recovery threshold temperature Ty4, the process returns to step S408, and the charging is performed in the "power limit mode".
Referring to fig. 4, in any one of the "full-speed charging mode", the "limited charging mode" and the "stop charging 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 continues to loop according to the flow shown in fig. 4 until the charging is completed. During the whole charging process, the external temperature Te is dynamically calculated in real time, the external temperature Te of the shell is ensured to be within a safe range, and the risk of safety accidents is reduced.
In addition, according to the vehicle-mounted wireless charging controller, the necessity of arranging temperature sensing on the outer surface of the shell can be omitted, the attractiveness and the use convenience of the vehicle-mounted wireless charging controller are enhanced, in addition, the calibration test work of a large number of sensors is omitted, and the vehicle-mounted wireless charging controller is suitable for all other vehicle-mounted wireless charging products and has high reusability.
In this context, the "limited charging mode" and the "limited power mode" of the charge recovery phase may be substantially controlled in the same manner, both by charging with different charging powers in stages or in stages, ensuring that the outside temperature Te does not rise sharply to fall within an uncontrollable range, thus improving control reliability. Although only one phase threshold is shown in fig. 5 to divide the charging flow into two stages. But it is easy for those skilled in the art to think that it is possible to use multiple levels of power for control, ensuring control refinement and enhancing reliability of control.
The logic and/or steps represented in the control flow diagrams 4 and 5 or otherwise described herein, such as an ordered listing of executable instructions that can be considered to implement 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 should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode.
The above description has described only exemplary embodiments 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/element (e.g., feature, structure, and/or characteristic) described in connection with the example is included in at least one example described herein, and may and/or may not be present in other examples. In addition, it will be understood that elements of any example described may be combined in any suitable manner in a number of different examples unless the context clearly dictates 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-board wireless charging controller for wireless charging of a device to be charged, comprising: a housing for supporting a 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 proximate the coil,
the vehicle-mounted wireless charging controller is characterized by further comprising a main calculating module, wherein the main calculating module is used for calculating a second temperature of the side, close to the equipment to be charged, of the shell based on the first temperature measured value from the temperature detecting module, the physical parameter related to the shell and the heat conduction power value related to the coil.
2. The in-vehicle wireless charging controller according to claim 1, further comprising a charging control module for controlling a current charging mode based on a comparison of the calculated second temperature with a predetermined temperature threshold.
3. The vehicle 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 a first temperature threshold, 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 a second temperature threshold, and the second temperature threshold is greater than the first temperature threshold.
4. The vehicle-mounted wireless charging controller according to claim 3, wherein the charging control module controls the current charging mode to be the stop charging mode when the second temperature is equal to or higher than a second temperature threshold.
5. The vehicle-mounted wireless charging controller according to claim 4, wherein when the current charging mode is the charging stop mode, the charging control module continuously judges whether the second temperature is reduced to a third temperature threshold, and when the second temperature is less than the third temperature threshold, the wireless charging is restarted and the current charging mode is controlled to be the power-limited charging mode, and the third temperature threshold is greater than or equal to the first temperature threshold but less than the second temperature threshold.
6. The vehicle-mounted wireless charging controller according to claim 5, wherein 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 lower than the fourth temperature threshold, the current charging mode is controlled to exit the limited power charging mode and enter the full-speed charging mode, and the fourth temperature threshold is smaller than or equal to the first temperature threshold.
7. The vehicle-mounted wireless charging controller according to 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 in-vehicle wireless charging controller of claim 3, wherein in the limited charging mode, the charging control module limits the charging power to a first value when the second temperature is greater than the first temperature threshold but less than a predetermined phase temperature threshold, and limits the charging 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 on-vehicle wireless charging controller according to any one of claims 1 to 8, wherein the calculation of the second temperature is performed periodically at predetermined time intervals.
10. The vehicle-mounted wireless charging controller according to any one of claims 1 to 8, wherein the device to be charged comprises a smartphone, a tablet computer or an electronic book.
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| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
| CN115782523A (en) * | 2022-12-30 | 2023-03-14 | 阿维塔科技(重庆)有限公司 | Temperature control method |
| 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 |
| CN114374307B (en) * | 2021-04-30 | 2024-06-11 | 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 |
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| CN110752638B (en) | 2023-09-12 |
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