Method for accounting for power loss

Abstract

According to one aspect of the present invention, the provided method for accounting for power loss comprises the steps of: acquiring information about a first interval between the upper surface of a coil of a wireless power transmitter and the upper surface of the wireless power transmitter and a second interval between the upper surface of a coil of a reference transmitter and the upper surface of the reference transmitter; and referring to the acquired information so as to account for power loss due to a friendly metal.

Description

Method for estimating power loss

[0001] The present invention relates to a method for estimating power loss.

[0002] The Wireless Power Consortium (WPC), an international standards organization for wireless power transfer, is developing the Qi standard for inductive wireless charging. The Qi standard defines the Baseline Power Profile (BPP) and the Extended Power Profile (EPP), and the Magnetic Power Profile (MPP) was recently defined.

[0003] Inductive wireless charging requires a wireless power transmitter and a wireless power receiver, and the absence of any foreign objects (FOs) between the two devices. If foreign objects are present between the two devices, not only will wireless charging performance deteriorate, but it can also pose significant safety risks.

[0004] The Qi standard specifies various methods for detecting foreign substances (FOD (Foreign Object Detection) method) based on BPP and EPP, and the MPLA (MPP Power Loss Accounting) method is being discussed for the FOD method based on MPP.

[0005] If the MPLA method currently being discussed is called the existing MPLA method, the existing MPLA method requires estimating the power loss due to the Friendly Metal (FM) in order to estimate (or estimate) the power loss due to the foreign matter. However, the existing MPLA method estimates the distance ( ) is not taken into account when estimating power loss, the linear model (i.e., linear fit curve) of power loss due to friendly metals derived by the existing MPLA method shows a large deviation compared to reality. This causes a large error when estimating power loss due to friendly metals in actual applications, and the error directly leads to a deterioration in the performance of the FOD method.

[0006] The purpose of the present invention is to solve all of the problems of the above-mentioned prior art.

[0007] In addition, another purpose of the present invention is to propose an improved MPLA method based on an analysis of the physical causes of errors that occur when estimating (or estimating) power loss due to a friendly metal using the existing MPLA method.

[0008] A representative configuration of the present invention to achieve the above purpose is as follows.

[0009] According to one aspect of the present invention, a method for estimating power loss is provided, comprising the steps of: obtaining information about a first distance between an upper surface of a coil of a wireless power transmitter and an upper surface of the wireless power transmitter and a second distance between an upper surface of a coil of a reference transmitter and an upper surface of the reference transmitter; and estimating power loss due to an affinity metal with reference to the obtained information.

[0010] According to another aspect of the present invention, a wireless power transmitter is provided, including an acquisition unit that acquires information about a first distance between an upper surface of a coil of a wireless power transmitter and an upper surface of the wireless power transmitter and a second distance between an upper surface of a coil of a reference transmitter and an upper surface of the reference transmitter, and an estimation management unit that estimates power loss due to an affinity metal by referring to the acquired information.

[0011] According to another aspect of the present invention, a method for estimating power loss is provided, comprising the steps of: obtaining information about a first distance between an upper surface of a coil of a wireless power transmitter and an upper surface of the wireless power transmitter and a second distance between an upper surface of a coil of a reference transmitter and an upper surface of the reference transmitter; and estimating power loss due to an affinity metal by referring to the obtained information.

[0012] According to another aspect of the present invention, a wireless power receiver is provided, including an acquisition unit that acquires information about a first distance between an upper surface of a coil of a wireless power transmitter and an upper surface of the wireless power transmitter and a second distance between an upper surface of a coil of a reference transmitter and an upper surface of the reference transmitter, and an estimation management unit that estimates power loss due to an affinity metal by referring to the acquired information.

[0013] In addition, other methods, other wireless power transmitters and other wireless power receivers for implementing the present invention are further provided.

[0014] According to the present invention, the improved MPLA method can be proven to have a performance advantage in terms of RMSE (Root Mean Squared Error) compared to the existing MPLA method, and can be implemented in a wireless power transmitter and wireless power receiver to which MPP is applied to improve the performance of foreign substance detection.

[0015] FIG. 1 is a diagram illustrating a loss-split model for a wireless power transmitter and a wireless power receiver.

[0016] Figure 2 is a diagram illustrating a linear model derived by the existing MPLA method.

[0017] Figure 3 is a diagram showing the results of comparing a linear model of power loss due to a friendly metal derived by the existing MPLA method with a linear model of power loss due to an ideal friendly metal.

[0018] Figures 4 to 7 are schematic drawings illustrating components of a wireless power transmitter and a wireless power receiver.

[0019] Fig. 8 is This is a diagram showing the linear model derived by the existing MPLA method under GG conditions, TG conditions, and GR conditions for a typical transmitter of 2.0 mm.

[0020] Fig. 9 is This is a diagram showing a linear model of power loss due to friendly metal derived by the conventional MPLA method under TR conditions for a typical transmitter of this 2.0 mm.

[0021] Fig. 10 is This is a diagram showing the linear model derived by the improved MPLA method under GG conditions, TG conditions, and GR conditions for a typical transmitter of 2.0 mm.

[0022] Fig. 11 is This is a diagram showing a linear model of power loss due to friendly metal derived by the improved MPLA method under TR conditions for a typical transmitter of this 2.0 mm.

[0023] Fig. 12 is This is a diagram showing the linear model derived by the existing MPLA method under GG conditions, TG conditions, and GR conditions for a typical transmitter of 4.0 mm.

[0024] Fig. 13 is This is a diagram showing a linear model of power loss due to friendly metal derived by the conventional MPLA method under TR conditions for a typical transmitter of this 4.0 mm.

[0025] Fig. 14 is This is a diagram showing the linear model derived by the improved MPLA method under GG conditions, TG conditions, and GR conditions for a typical transmitter of 4.0 mm.

[0026] Fig. 15 is This is a diagram showing a linear model of power loss due to friendly metal derived by the improved MPLA method under TR conditions for a typical transmitter of this 4.0 mm.

[0027] The following detailed description of the present invention refers to the accompanying drawings, which illustrate specific embodiments in which the present invention may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the present invention. It should be understood that the various embodiments of the present invention, while different from each other, are not necessarily mutually exclusive. For example, specific shapes, structures, and characteristics described herein may be modified and implemented from one embodiment to another without departing from the spirit and scope of the present invention. Furthermore, it should be understood that the positions or arrangements of individual components within each embodiment may also be modified without departing from the spirit and scope of the present invention. Accordingly, the following detailed description is not to be taken in a limiting sense, and the scope of the present invention is to be construed to encompass the scope of the claims and all equivalents thereof. Like reference numerals in the drawings represent the same or similar elements throughout the several aspects.

[0028] In this specification, it is noted that the meaning of the term "estimate" may be used interchangeably with the meaning of the terms "estimate," "calculate," or "measure," and vice versa.

[0029] Hereinafter, various preferred embodiments of the present invention will be described in detail with reference to the attached drawings so that a person having ordinary skill in the art to which the present invention pertains can easily practice the present invention.

[0030] Background of the Proposal for an Improved MPLA Method

[0031] MPP is a new power profile introduced in the Qi2 standard, initially discussed based on Apple's MagSafe. Compared to existing BPP and EPP, MPP is characterized by the addition of an additional element, a magnet, to ensure alignment and fixation of the wireless power transmitter (hereinafter, "transmitter" or "PTx") and wireless power receiver (hereinafter, "receiver" or "PRx").

[0032] As described in the technical background of the invention, establishing an FOD method is crucial for MPP, as are BPP and EPP. The existing MPLA method, discussed as an FOD method for MPP, is scheduled for implementation as follows.

[0033] Power loss due to foreign substances in the existing MPLA method is the transmission power and receiving power It is estimated that the car is The relationship is established. Here, is transmitted by the transmitter It is estimated by the relationship between by the receiver It is estimated by the relationship equation. That is, To estimate, the transmitter must input voltage , input current , transmitter side circuit power loss , transmitter side coil power loss and power loss due to friendly metals must be estimated. In addition, the receiver must be rated at a rectified voltage , commutation current , receiver side circuit power loss and receiver side coil power loss should be estimated. Under TR conditions (specific details of TR conditions will be described later), , and Each of these, , , It is estimated by the relationship equation. Here, , , and may be referred to as the MPLA coefficient or the PLA coefficient, , , and may be referred to as a scaling factor or an eco-system scaling factor.

[0034] The MPLA coefficient is calculated from the slope and intercept of a linear model (i.e., linear fit curve) as shown in Fig. 2, derived using a loss partition model for a transmitter and receiver as shown in Fig. 1.

[0035] The scaling factors are generally , , and are defined as follows. Here, GG, TG, GR, and TR in the superscripts are used to distinguish various transmitter and receiver pairs. Specifically, GG means that the transmitter is a reference transmitter (Ref. PTx (TPT)) specified in the Qi standard, and the receiver is also a reference receiver (Ref. PRx (TPR)) specified in the Qi standard. In addition, TG means that the transmitter is a general (or unknown) transmitter (General PTx) and the receiver is a reference receiver (Ref. PRx (TPR)) specified in the Qi standard. In addition, GR means that the transmitter is a reference transmitter (Ref. PTx (TPT)) specified in the Qi standard, and the receiver is a general (or unknown) receiver (General PRx). In addition, TR means that the transmitter is a general (or unknown) transmitter (General PTx) and the receiver is also a general (or unknown) receiver (General PRx). The existing MPLA method ultimately aims to derive results under TR conditions. The same applies to the improved MPLA method described later.

[0036] refers to the distance from the coil placed in the transmitter to the upper surface of the transmitter. Specifically, refers to the distance from the upper surface of the coil placed in the transmitter to the upper surface of the interface of the transmitter.

[0037] The existing MPLA method is for general transmitters. Without considering the reference transmitter, The power loss of a typical transmitter was estimated by limiting the distance to 1.2 mm. However, the Qi standard is This does not necessarily mean that it must be 1.2 mm, and it depends on the intended use of the general transmitter. This can vary. In fact, for home wireless power transmitters, Although it is common to design the wireless power transmitter for vehicles to be 1.2 mm, there are mechanical / structural issues such as housing thickness, anti-slip pad, printed circuit board (PCB) with EMI (Electro Magnetic Interference) shielding pattern, and air flow path for heat dissipation. It is necessary to increase the radiance of the transmitter to 1.2 mm or more. Therefore, the radiance of the transmitter is (which may also be referred to as the first interval) of the reference transmitter. After adjusting for (what may be called the second gap), it is necessary to estimate the power loss of a typical transmitter.

[0038] In Fig. 3 (a) For this 2.0 mm typical transmitter, the TR condition was derived by the existing MPLA method. Linear model and ideal The linear model is shown together, and in Fig. 3 (b) For this 4.0 mm typical transmitter, the TR condition was derived by the existing MPLA method. Linear model and ideal A linear model is shown together. The model shown as a dotted line is the ideal is a linear model, and the model shown as a solid line is derived through the existing MPLA method. is a linear model. Referring to Fig. 3 (a) and (b), the conventional MPLA method is derived for a general transmitter. Linear model and ideal The linear model shows a big difference. This is in practical application. This causes a large error in estimating the FOD, and the error directly leads to a deterioration in the performance of the FOD method.

[0039] The improved MPLA method proposed in the present invention is a reference transmitter and general transmitters With reference to can be estimated. Specifically, the reference transmitter's of a general transmitter Adjust it the same way as can be estimated.

[0040] first, this Looking at the impact on As this increases, the leakage flux increases and interacts with a wider area of ​​friendly metal. This phenomenon also occurs under the same conditions of wireless power transmitters. As this changes, the value of the scaling factor may change, and this change in the value of the scaling factor It is bound to cause changes.

[0041] In view of this, the improved MPLA method proposed in the present invention includes a reference transmitter of a general transmitter After adjusting to fit was estimated. Specifically, for the measurement-based MPLA method, the general transmitter and reference transmitter The improved MPLA method was performed by placing a gap (e.g., air, transparent acrylic, etc.) equal to the difference between the reference transmitter and the simulation-based MPLA method and the loss-based model. and reference transmitter An improved MPLA method was implemented by placing a receiver that reflects the difference in the Finite Element Analysis (FEA) simulation space.

[0042] Improved MPLA method

[0043] According to one embodiment of the present invention, the transmitter and receiver may include basic components for magnetic induction wireless charging, such as a coil module. The transmitter may additionally include a magnet for MPP application. Furthermore, the receiver may include an affinity metal. Drawings illustrating the configuration of the transmitter and receiver are as shown in FIGS. 4 to 7.

[0044] Specifically, FIG. 4 (a) and (b) illustrate a perspective view and an exploded perspective view, respectively, of a reference transmitter (Ref. PTx (TPT)) specified in the Qi standard. As illustrated in FIG. 4 , the transmitter may include a coil (410), a magnet (420), a lower enclosure (430), an upper enclosure (440), and the like. Here, the coil (410) may be configured to operate based on MPP, and the magnet (420) may be formed in a form that at least partially surrounds the coil (410).

[0045] In addition, (a) and (b) of FIG. 5 show a plan view and a perspective view of a general (or unknown) transmitter (General PTx), respectively. Unlike the perspective view, the plan view shows a prototype rather than a modeling drawing. As shown in FIG. 5, the transmitter may include a coil (510), a magnet (520), a ferrite (530), a bracket (540), etc. Specifically, the coil (510) may be composed of one coil (511) positioned at the top and two coils (512, 513) positioned at the bottom, and the coil (511) positioned at the top may be configured to operate based on MPP. In addition, the magnet (520) may be formed in a shape that at least partially surrounds the coil (511) positioned at the top. For example, the magnet (520) may be formed in a shape that is basically a circle, but has alternating arc shapes of circles having a central angle of 150 degrees. Additionally, the bracket (540) may be made of aluminum.

[0046] Meanwhile, in the transmitter, the distance from the coil (511) placed at the top to the upper surface of the transmitter may be configured as 1.2 mm, and the distance from the magnet (520) to the upper surface of the transmitter may be configured as 0.9 mm. However, It is not limited to this 1.2 mm, but depends on the purpose of the transmitter. may vary. For example, for a home transmitter can be made up of 1.2 mm and is a vehicle transmitter. It may be configured to be 2.0 mm or thicker due to mechanical / structural issues such as housing thickness, anti-slip pads, PCB with EMI shielding pattern, air path for heat dissipation, etc.

[0047] In addition, (a) and (b) of FIG. 6 illustrate a perspective view and an exploded perspective view, respectively, of a reference receiver (Ref. PRx (TPR)) specified in the Qi standard. As illustrated in FIG. 6, the receiver may include a coil (610), a magnet (620), a lower enclosure (630), a support plate (640), and an affinity metal (650). Here, the coil (610) may operate based on MPP, and the magnet (620) may be formed in a form that at least partially surrounds the coil (610). In addition, the thickness of the affinity metal (650) may be configured to be 4.3 mm.

[0048] In addition, a perspective view and an exploded perspective view of a general (or unknown) receiver (General PRx) are respectively shown in (a) and (b) of FIG. 7. As shown in FIG. 7, the receiver may include a coil (710), a magnet (720), a lower enclosure (730), a support plate (740), an affinity metal (750), etc. Here, the coil (710) may operate based on MPP, and the magnet (720) may be formed in a shape that at least partially surrounds the coil (710). In addition, the thickness of the affinity metal (750) may be configured to be 0.7 mm. As the thickness of the affinity metal becomes thinner, the Open-air R increases and the Open-air Q decreases. However, the receiver as shown in FIG. 7 may have a thinner affinity metal compared to the receiver as shown in FIG. 6. The receiver as shown in Fig. 7 has a thickness of the friendly metal and a thickness of the friendly metal as compared to the receiver as shown in Fig. 6. Except that the components may be identical to each other.

[0049] Meanwhile, according to one embodiment of the present invention, the transmitter and receiver may each include a component (not shown) for computational processing. This component may be referred to as a control circuit and may be composed of components such as a processor and memory. Furthermore, this component may be configured in the form of a functional module. For example, the component for computational processing may be configured in the form of modules referred to as an acquisition unit, an estimation management unit, etc. in the transmitter and receiver, respectively. This functional module may be understood as being included in the control circuit described above. An improved MPLA method based on the functional module is described as follows.

[0050] According to one embodiment of the present invention, when a general transmitter performs an improved MPLA method, the acquisition unit sets a first distance between the upper surface of the coil of the general transmitter and the upper surface of the general transmitter (the upper surface of the general transmitter) ) and a second gap between the upper surface of the coil of the reference transmitter and the upper surface of the reference transmitter (of the reference transmitter ) can be obtained, and the estimation management department can estimate the power loss due to the friendly metal by referring to the obtained information.

[0051] According to one embodiment of the present invention, the improved MPLA method described as being performed by a functional module in this way may be described as being performed by the transmitter or receiver itself as the subject, or by each control circuit included in the transmitter or receiver as the subject.

[0052] Hereinafter, we will examine an embodiment (hereinafter, "First Embodiment") that implements an improved MPLA method under conditions in which a general receiver cooperates, and an embodiment (hereinafter, "Second Embodiment") that implements an improved MPLA method under conditions in which a general receiver does not cooperate. While the embodiments described below are primarily described with a transmitter or a receiver in mind, it should be noted that the aforementioned control circuit or functional module may also be primarily described.

[0053] Embodiment 1: Improved MPLA method under conditions where a general receiver cooperates.

[0054] In this embodiment, a general transmitter After simulating the existing MPLA method and the improved MPLA method under conditions corresponding to 2.0 mm or 4.0 mm, respectively, and comparing and evaluating their performances, a method for implementing the improved MPLA method in a transmitter and receiver is described.

[0055] Meanwhile, in addition to the above conditions, the simulation and The simulations were performed under conditions where the load power, defined as the product of , corresponds to 10 W, 12.5 W, and 15 W. In addition, the simulations were also performed under the condition that the receiver is located at (0, 0, 0), (0, 0, 2), (2, 0, 0), and (2, 0, 2) when the transmitter is located at (0, 0, 0) in a three-dimensional rectangular coordinate system. Here, if the y-coordinate is omitted from the coordinates of the receiver, it can also be expressed as being performed at (0, 0), (0, 2), (2, 0), and (2, 2).

[0056] According to one embodiment of the present invention, the existing MPLA method is a general transmitter Without considering the reference transmitter, Limited to 1.2 mm A linear model was derived, but the improved MPLA method is based on the reference transmitter. of a general transmitter After adjusting to fit A linear model can be derived.

[0057] First, the general transmitter The simulation results under conditions corresponding to this 2.0 mm are described.

[0058] The existing MPLA method is as shown in Fig. 8. For this 2.0 mm general transmitter, the reference transmitter under GG conditions, TG conditions and GR conditions A linear model was derived by limiting the thickness to 1.2 mm. The MPLA coefficients under each condition are shown in Table 1.

[0059]

[0060] GG0.46470.49390.06700.2016TG0.36610.49390.17910.4273GR0.46490.43850.08370.1906

[0061]

[0062] Additionally, the scaling factors for each condition are as shown in Table 2.

[0063]

[0064] 1.0001.0002.67312.120

[0065]

[0066] Under TR conditions, the existing MPLA method is, The estimated value of It is calculated as follows, The estimated value of is calculated as follows. In addition, under TR conditions, the existing MPLA method, The estimated value of It is calculated as follows.

[0067] In Fig. 9 For this 2.0 mm typical transmitter, the TR condition was derived by the existing MPLA method. A linear model of is shown. The model shown as a dotted line is an ideal As a linear model, in this case The estimated value of . In addition, the model shown in solid lines is a model derived by the existing MPLA method. In this case, The estimated value of It is the same as .

[0068] According to one embodiment of the present invention, the two models illustrated in FIG. 9 are as shown in Table 3 from an RMSE perspective. The unit is mW.

[0069]

[0070] Ideal model Model based on existing MPLA method RMSE 83.3120

[0071]

[0072] According to one embodiment of the present invention, the existing MPLA method was found to have a performance degradation of about 44.1% in terms of RMSE compared to the ideal model.

[0073] An improved MPLA method according to one embodiment of the present invention is as shown in FIG. 10. For this 2.0 mm general transmitter, the reference transmitter under GG conditions, TG conditions and GR conditions After adjusting to 2.0 mm, a linear model was derived. The MPLA coefficients under each condition are shown in Table 4.

[0074]

[0075] GG0.46480.49390.08960.1542TG0.36610.49390.17910.4273GR0.46500.43850.09550.1829

[0076]

[0077] Additionally, according to one embodiment of the present invention, the reference transmitter The scaling factor after adjusting to 2.0 mm is as shown in Table 5.

[0078]

[0079] 1.0001.0001.99892.7711

[0080]

[0081] According to one embodiment of the present invention, an improved MPLA method For this 2.0 mm typical transmitter, the reference transmitter under TR conditions of a general transmitter After adjusting to fit can be estimated.

[0082] Specifically, the reference transmitter This general transmitter When adjusted to 2.0 mm, The estimated value of It is calculated as follows, The estimated value of It is calculated as follows. The estimated value of It is calculated as follows.

[0083] In Fig. 11 For this 2.0 mm typical transmitter, the improved MPLA method under TR conditions was derived. A linear model of is shown. The model shown as a dashed line in Fig. 11 is a model derived by the improved MPLA method. The estimated value of The model shown in solid lines is a model derived by the existing MPLA method, The estimated value of . The model shown by the dotted line is the ideal model, The estimated value of It is the same as .

[0084] According to one embodiment of the present invention, the three models illustrated in FIG. 11 are as shown in Table 6 from an RMSE perspective. The unit is mW.

[0085]

[0086] Ideal modelModel based on existing MPLA methodModel based on improved MPLA methodRMSE83.312089.8

[0087]

[0088] According to one embodiment of the present invention, a model according to the improved MPLA method was verified to have a performance advantage in terms of RMSE of about 25.2% compared to a model according to the existing MPLA method.

[0089] Next, the general transmitter The simulation results under conditions corresponding to this 4.0 mm are described.

[0090] The existing MPLA method is as shown in Fig. 12. For this 4.0 mm general transmitter, the reference transmitter under GG conditions, TG conditions and GR conditions A linear model was derived by limiting the thickness to 1.2 mm. The MPLA coefficients under each condition are shown in Table 7.

[0091]

[0092] GG0.46470.49390.06700.2016TG0.36610.49390.16510.5803GR0.46490.43850.08370.1906

[0093]

[0094] Additionally, the scaling factors for each condition are as shown in Table 8.

[0095]

[0096] 1.0001.0002.46422.8785

[0097]

[0098] Under TR conditions, the existing MPLA method is, The estimated value of It is calculated as follows, The estimated value of It is calculated as follows.

[0099] In Fig. 13 This is derived by the existing MPLA method under the TR condition of 4.0 mm. A linear model of is shown. The model shown as a dotted line is an ideal As a linear model, in this case The estimated value of . In addition, the model shown in solid lines is a model derived by applying the existing MPLA method. In this case, The estimated value of It is the same as .

[0100] According to one embodiment of the present invention, the two models illustrated in FIG. 13 are as shown in Table 9 from an RMSE perspective. The unit is mW.

[0101]

[0102] Ideal model Model based on existing MPLA method RMSE 80.9 13 0.4

[0103]

[0104] According to one embodiment of the present invention, the existing MPLA method was confirmed to have a performance degradation of about 61.2% in terms of RMSE compared to the ideal model.

[0105] An improved MPLA method according to one embodiment of the present invention is as shown in FIG. 14. For this 4.0 mm general transmitter, the reference transmitter under GG conditions, TG conditions and GR conditions After adjusting to 4.0 mm A linear model was derived. The MPLA coefficients under each condition are shown in Table 10.

[0106]

[0107] GG0.46490.49390.09970.1773TG0.36610.49390.16510.5803GR0.46500.43850.11570.1677

[0108]

[0109] Additionally, according to one embodiment of the present invention, the reference transmitter The scaling factor after adjusting to 4.0 mm is as shown in Table 11.

[0110]

[0111] 1.0001.0001.65603.2730

[0112]

[0113] According to one embodiment of the present invention, an improved MPLA method For this 4.0 mm typical transmitter, the reference transmitter under TR conditions of a general transmitter After adjusting to fit can be estimated.

[0114] Specifically, the reference transmitter This general transmitter When adjusted to 4.0 mm, The estimated value of It is calculated as follows, The estimated value of It is calculated as follows. The estimated value of It is calculated as follows.

[0115] In Fig. 15 For this 4.0 mm typical transmitter, the improved MPLA method under TR conditions was derived. A linear model of is shown. The model shown as a dashed line in Fig. 15 is a model derived by the improved MPLA method. The estimated value of The model shown in solid lines is a model derived by the existing MPLA method, The estimated value of . The model shown by the dotted line is the ideal model, The estimated value of It is the same as .

[0116] According to one embodiment of the present invention, the three models illustrated in FIG. 15 are as shown in Table 12 from an RMSE perspective. The unit is mW.

[0117]

[0118] Ideal modelModel based on existing MPLA methodModel based on improved MPLA methodRMSE80.9130.481.4

[0119]

[0120] According to one embodiment of the present invention, a model according to the improved MPLA method was verified to have a performance advantage in terms of RMSE of about 37.6% compared to a model according to the existing MPLA method.

[0121] According to one embodiment of the present invention, two methods can be considered for implementing the improved MPLA method in a transmitter and a receiver under conditions in which the receiver cooperates.

[0122] First, let me explain the first option.

[0123] First of all, the general transmitter has a general transmitter. A scaling factor may be stored according to the general transmitter. Specifically, the general transmitter may have a ( corresponding to the scaling factor according to , ) may be stored. At this time, the subscript x is the general transmitter's can mean. More specifically, if x corresponds to h, then the general transmitter is intended for home use. This could mean that 1.2 mm, and if x corresponds to v, then the general transmitter is intended for use in vehicles. This could mean that it is 2.0 mm. That is, for a normal transmitter If this is 1.2mm ( , ) may be stored in the general transmitter, and the general transmitter's If this is 2.0 mm ( , ) may be stored in a general transmitter. However, the use of a general transmitter is not limited to home or vehicle use, and the use of a general transmitter Also, it is not limited to 1.2 mm or 2.0 mm.

[0124] A typical receiver may have a set of MPLA coefficients stored, i.e., a defined There may be as many MPLA coefficients stored as there are numbers of . Specifically, a typical receiver has a defined A set of MPLA coefficients containing as many MPLA coefficients as there are MPLA coefficients { , } may be stored, and in this case, the subscript x is can mean. For example, If defined as 1.2 mm and 2.0 mm, a typical receiver This is the MPLA coefficient, which means 1.2 mm ( , )and This is the MPLA coefficient, which means 2.0 mm ( , ) can all be stored. However, the defined is not limited to 1.2 mm or 2.0 mm, but is a multiple This can be defined.

[0125] Continuing, the normal transmitter uses PLAP packets (in some cases, the PLAP packet transmitted from the receiver to the transmitter may be called the first packet). can be transmitted to a general receiver.

[0126] Continuing, the general receiver uses PLAP packets to and { , } can be transmitted to a general transmitter. At this time, the reserved bit of the PLAP packet is defined. By assigning, corresponding to each MPLA coefficient can transmit information about. Specifically, a PLAP packet can consist of 7 bytes, of which the second byte (B1) and the third byte (B2) Information corresponding to can be allocated, and the fourth byte (B3) and fifth byte (B4) Information corresponding to can be allocated, and the sixth byte (B5) and seventh byte (B6) Information corresponding to may be allocated. Here, the bit sequence b7 to b0 of the first byte (B0) of the PLAP packet may correspond to a spare bit, and the spare bit may include and Applicable to Information corresponding to the conditions can be assigned. For example, In this case, 0 is assigned to the spare bits of the PLAP packet, corresponding to 1.2 mm. If this corresponds to 2.0 mm, 1 can be assigned. At this time, the MPLA coefficient corresponding to 0 of the spare bit is ( , ) can be, and the MPLA coefficient corresponding to 1 of the spare bit is ( , ) may be. However, as defined in the spare bits, The method of allocating is not limited to the above examples. In addition, there are many is defined and can be allocated to the spare bits of the PLAP packet.

[0127] Continuing, the general transmitter is the general transmitter. Using the corresponding MPLA coefficients can be estimated. Specifically, a general transmitter refers to the spare bits of the PLAP packet received from a general receiver to estimate a set of MPLA coefficients { , } Among the general transmitters Select the corresponding MPLA coefficient and use the saved scaling factor. can be estimated. For a general transmitter The relationship for estimating is , and in this case, the subscript x is can mean, for example, a typical transmitter In this case of 1.2 mm, the normal transmitter is the MPLA coefficient corresponding to the 0 value of the spare bit of the PLAP packet ( , ) and select Through can be estimated. On the other hand, for general transmitters, In this case of 2.0mm, the general transmitter corresponds to the value 1 of the spare bit of the PLAP packet ( , ) and select Through can be estimated. Meanwhile, a general transmitter Besides can be further estimated, and the general receiver is can be estimated.

[0128] Next, we explain the second option.

[0129] First of all, the general transmitter has a general transmitter. A scaling factor may be stored according to the general transmitter. Specifically, the general transmitter may have a ( corresponding to the scaling factor according to , ) may be stored. At this time, the subscript x is the general transmitter's can mean. More specifically, if x corresponds to h, then the general transmitter is intended for home use. This could mean that 1.2 mm, and if x corresponds to v, then the general transmitter is intended for use in vehicles. This could mean that it is 2.0 mm. That is, for a normal transmitter If this is 1.2mm ( , ) may be stored in the general transmitter, and the general transmitter's If this is 2.0 mm ( , ) may be stored in a general transmitter. However, the use of a general transmitter is not limited to home or vehicle use, and the use of a general transmitter Also, it is not limited to 1.2 mm or 2.0 mm.

[0130] A typical receiver may have a set of MPLA coefficients stored, i.e., a defined There may be as many MPLA coefficients stored as there are numbers of . Specifically, a typical receiver has a defined A set of MPLA coefficients containing as many MPLA coefficients as there are MPLA coefficients { , } may be stored, and in this case, the subscript x is can mean. For example, If defined as 1.2 mm and 2.0 mm, a typical receiver This is the MPLA coefficient, which means 1.2 mm ( , )and This is the MPLA coefficient, which means 2.0 mm ( , ) can all be stored. However, the defined is not limited to 1.2 mm or 2.0 mm, but is a multiple This can be defined.

[0131] Continuing, at the request of the generic receiver, the generic transmitter uses an XID packet (in some cases, the XID packet transmitted from the receiver to the transmitter may be called a second packet) to can transmit information about the general receiver. Specifically, the general transmitter's reserved bit of the XID packet By assigning , the general transmitter Information about the device identifier can be assigned to the XID packet. More specifically, the XID packet may consist of 9 bytes, of which the fifth byte (B4) to the seventh byte (B6) may correspond to information about the device identifier, and the seventh byte (B6) to the ninth byte (B8) may correspond to manufacturing reserved bits. Here, the first byte (B0) to the fifth byte (B4) of the XID packet may correspond to reserved bits, and the reserved bits may include information about the general transmitter. Information corresponding to the condition can be assigned. For example, for a general transmitter In this case of 1.2 mm, the spare bits of the XID packet are assigned 0 and can be transmitted to a general receiver. On the other hand, for a general transmitter In this case of 2.0 mm, the spare bit of the XID packet is assigned 1 and can be transmitted to a general receiver. However, for a general transmitter, is not limited to 1.2 mm or 2.0 mm. Also, the XID packet contains a common transmitter The method of assigning corresponding information is not limited to the above example.

[0132] Continuing, the normal transmitter uses PLAP packets. can be transmitted to a general receiver.

[0133] Continuing, the general receiver uses PLAP packets to And the general transmitter MPLA coefficient corresponding to ( , ) can be transmitted to the general transmitter. Specifically, the general receiver refers to the spare bits of the XID packet to transmit the , and the general transmitter The MPLA coefficient corresponding to ( , ) can be selected and transmitted to a general transmitter. More specifically, a PLAP packet can consist of 7 bytes, of which the second byte (B1) and the third byte (B2) Information corresponding to can be allocated, and the fourth byte (B3) and fifth byte (B4) Information corresponding to can be allocated, and the sixth byte (B5) and seventh byte (B6) Information corresponding to may be allocated. Here, the bit sequence b7 to b0 of the first byte (B0) of the PLAP packet may correspond to spare bits. For example, if the value of the spare bit of the XID packet transmitted from the general transmitter is 0, the general receiver may is determined to be 1.2 mm, { , } among ( , ) can be selected and transmitted to the general transmitter. On the other hand, if the value of the reserved bit of the XID packet is 1, the general receiver can transmit to the general transmitter. is determined to be 2.0 mm, { , } among ( , ) can be selected to transmit to a general transmitter.

[0134] Continuing, the general transmitter uses the MPLA coefficients received from the general receiver. can be estimated. For a general transmitter The relationship for estimating is is the same as. For example, in a general transmitter In this case of 1.2 mm, a typical transmitter is (from a typical receiver) , ) will be transmitted, Through can be estimated. On the other hand, for general transmitters, If this is 2.0 mm, a typical transmitter will be (from a typical receiver) , ) will be transmitted, Through can be estimated. Meanwhile, a general transmitter Besides can be further estimated, and the general receiver is can be estimated.

[0135] Second embodiment: An improved MPLA method under conditions where a general receiver does not cooperate.

[0136] According to one embodiment of the present invention, a general transmitter In cases where a typical receiver does not cooperate under conditions not corresponding to this 1.2 mm, two approaches can be considered for implementing the improved MPLA method in transmitters and receivers.

[0137] First, let me explain the first option.

[0138] First of all, the general receiver has a reference transmitter MPLA coefficients may be stored according to the following. Specifically, in a typical receiver ( , ) may be calculated and stored.

[0139] A normal transmitter has a normal transmitter. A scaling factor according to can be calculated and stored. Specifically, a general transmitter can calculate a scaling factor ( , ) of a general transmitter can be calculated based on. More specifically, the boundary of the reference transmitter can be calculated based on the boundary of the reference transmitter. and reference transmitter The scaling factor can be calculated by spacing out the difference in the reference transmitter. For example, This corresponds to 1.2 mm, and is the standard transmitter For this 2.0 mm case, the scaling factor can be calculated by placing a 0.8 mm thick air, acrylic plate, etc. on the boundary surface of the reference transmitter.

[0140] Continuing, the general receiver uses the PLAP packets to calculate the MPLA coefficients ( , ) can be transmitted to a general transmitter. Specifically, a PLAP packet can consist of 7 bytes, of which the second byte (B1) and the third byte (B2) Information corresponding to can be allocated, and the fourth byte (B3) and fifth byte (B4) Information corresponding to can be allocated, and the sixth byte (B5) and seventh byte (B6) Information corresponding to may be allocated. Here, bit sequences b7 to b0 of the first byte (B0) of the PLAP packet may correspond to spare bits.

[0141] Continuing, the general transmitter receives the MPLA coefficients from the general receiver and the general transmitter's Using a scaling factor according to can be estimated. Specifically, a general transmitter receives ( , ) and calculated from a general transmitter ( , ) using can be estimated. For a general transmitter The relationship for estimating is It is the same as .

[0142] Next, we explain the second option.

[0143] First of all, the general receiver has a reference transmitter A scaling factor may be stored according to the following. Specifically, a typical receiver may have ( , ) may be calculated and stored. At this time, and can be calculated as

[0144] A normal transmitter has a normal transmitter. The MPLA coefficients according to the general transmitter can be calculated and stored. Specifically, the general transmitter has MPLA coefficient according to ( , ) can be calculated and stored.

[0145] Continuing, a typical receiver uses PLAP packets to scale the packets ( , ) can be transmitted to a general transmitter. Specifically, a PLAP packet can consist of 7 bytes, of which the second byte (B1) and the third byte (B2) Information corresponding to can be allocated, and the fourth byte (B3) and fifth byte (B4) Information corresponding to can be allocated, and the sixth byte (B5) and seventh byte (B6) Information corresponding to may be allocated. Here, bit sequences b7 to b0 of the first byte (B0) of the PLAP packet may correspond to spare bits.

[0146] Continuing, the general transmitter receives the scaling factor from the general receiver and the general transmitter's Using the MPLA coefficient according to can be estimated. Specifically, a general transmitter receives ( , ) and general transmitters MPLA coefficient according to ( , ) using can be estimated. For a general transmitter The relationship for estimating is It is the same as .

[0147] Although the present invention has been described above with specific details such as specific components and limited examples and drawings, these are provided only to help a more general understanding of the present invention, and the present invention is not limited to the above examples, and those with ordinary knowledge in the technical field to which the present invention pertains can make various modifications and changes based on this description.

[0148] Therefore, the idea of ​​the present invention should not be limited to the embodiments described above, and not only the scope of the patent claims described below but also all scopes equivalent to or equivalently modified from the scope of the patent claims are considered to fall within the scope of the idea of ​​the present invention.

Claims

1. As a method for estimating power loss, A step of obtaining information about a first gap between an upper surface of a coil of a wireless power transmitter and an upper surface of an interface of the wireless power transmitter and a second gap between an upper surface of a coil of a reference transmitter and an upper surface of the reference transmitter, and A step of estimating power loss by a friendly metal by referring to the above-obtained information. method.

2. In paragraph 1, The above first interval may vary depending on the intended use of the wireless power transmitter. method.

3. In paragraph 1, The above second interval is adjusted to match the above first interval. method.

4. In paragraph 3, The first packet transmitted from the wireless power receiver includes information about a coefficient used to estimate the power loss, In the above estimation step, the power loss of the wireless power transmitter is estimated by referring to the coefficient corresponding to the first interval and the factor used to estimate the power loss corresponding to the first interval. method.

5. In paragraph 3, The second packet transmitted to the wireless power receiver includes information about the first interval, The first packet transmitted from the wireless power receiver includes information about a coefficient used to estimate the power loss corresponding to the first interval, In the above estimation step, the power loss of the wireless power transmitter is estimated by referring to the coefficient and the factor used to estimate the power loss corresponding to the first interval. method.

6. In paragraph 1, A first packet transmitted from a wireless power receiver includes information about a coefficient used to estimate the power loss corresponding to the second interval, In the above estimation step, the power loss of the wireless power transmitter is estimated by referring to the coefficient and the factor used to estimate the power loss corresponding to the first interval. method.

7. In paragraph 1, A first packet transmitted from a wireless power receiver includes information about a factor used to estimate the power loss corresponding to the second interval, In the above estimation step, the power loss of the wireless power transmitter is estimated by referring to the coefficient used to estimate the power loss corresponding to the factor and the first interval. method.

8. An acquisition unit that acquires information about a first gap between the upper surface of the coil of the wireless power transmitter and the upper surface of the wireless power transmitter and a second gap between the upper surface of the coil of the reference transmitter and the upper surface of the reference transmitter, and Including an estimation management unit that estimates power loss by friendly metal by referring to the above-obtained information. Wireless power transmitter.

9. In paragraph 8, The above first interval may vary depending on the intended use of the wireless power transmitter. Wireless power transmitter.

10. In paragraph 8, The above second interval is adjusted to match the above first interval. Wireless power transmitter.

11. In paragraph 10, The first packet transmitted from the wireless power receiver includes information about a coefficient used to estimate the power loss, The above estimation management unit estimates the power loss of the wireless power transmitter by referring to the coefficient corresponding to the first interval and the factor used to estimate the power loss corresponding to the first interval. Wireless power transmitter.

12. In paragraph 10, The second packet transmitted to the wireless power receiver includes information about the first interval, The first packet transmitted from the wireless power receiver includes information about a coefficient used to estimate the power loss corresponding to the first interval, The above estimation management unit estimates the power loss of the wireless power transmitter by referring to the coefficient and the factor used to estimate the power loss corresponding to the first interval. Wireless power transmitter.

13. In paragraph 8, A first packet transmitted from a wireless power receiver includes information about a coefficient used to estimate the power loss corresponding to the second interval, The above estimation management unit estimates the power loss of the wireless power transmitter by referring to the coefficient and the factor used to estimate the power loss corresponding to the first interval. Wireless power transmitter.

14. In paragraph 8, A first packet transmitted from a wireless power receiver includes information about a factor used to estimate the power loss corresponding to the second interval, The above estimation management unit estimates the power loss of the wireless power transmitter by referring to the coefficient used to estimate the power loss corresponding to the factor and the first interval. Wireless power transmitter.

15. As a method for estimating power loss, A step of obtaining information about a first gap between an upper surface of a coil of a wireless power transmitter and an upper surface of an interface of the wireless power transmitter and a second gap between an upper surface of a coil of a reference transmitter and an upper surface of the reference transmitter, and A step of estimating power loss by the friendly metal by referring to the above-obtained information. method.

16. In paragraph 15, The above first interval may vary depending on the intended use of the wireless power transmitter. method.

17. In paragraph 15, The above second interval is adjusted to match the above first interval. method.

18. In paragraph 17, The first packet transmitted from the wireless power receiver includes information about a coefficient used to estimate the power loss, In the above estimation step, the power loss of the wireless power transmitter is estimated by referring to the coefficient corresponding to the first interval and the factor used to estimate the power loss corresponding to the first interval. method.

19. In paragraph 17, The second packet transmitted to the wireless power receiver includes information about the first interval, The first packet transmitted from the wireless power receiver includes information about a coefficient used to estimate the power loss corresponding to the first interval, In the above estimation step, the power loss of the wireless power transmitter is estimated by referring to the coefficient and the factor used to estimate the power loss corresponding to the first interval. method.

20. In paragraph 15, A first packet transmitted from a wireless power receiver includes information about a coefficient used to estimate the power loss corresponding to the second interval, In the above estimation step, the power loss of the wireless power transmitter is estimated by referring to the coefficient and the factor used to estimate the power loss corresponding to the first interval. method.

21. In paragraph 15, A first packet transmitted from a wireless power receiver includes information about a factor used to estimate the power loss corresponding to the second interval, In the above estimation step, the power loss of the wireless power transmitter is estimated by referring to the coefficient used to estimate the power loss corresponding to the factor and the first interval. method.

22. An acquisition unit for acquiring information about a first gap between an upper surface of a coil of a wireless power transmitter and an upper surface of the wireless power transmitter and a second gap between an upper surface of a coil of a reference transmitter and an upper surface of the reference transmitter, and Including an estimation management unit that estimates power loss due to friendly metal by referring to the above-mentioned acquired information. Wireless power receiver.

23. In paragraph 22, The above first interval may vary depending on the intended use of the wireless power transmitter. Wireless power receiver.

24. In paragraph 22, The above second interval is adjusted to match the above first interval. Wireless power receiver.

25. In paragraph 24, The first packet transmitted from the wireless power receiver includes information about a coefficient used to estimate the power loss, The above estimation management unit estimates the power loss of the wireless power transmitter by referring to the coefficient corresponding to the first interval and the factor used to estimate the power loss corresponding to the first interval. Wireless power receiver.

26. In paragraph 24, The second packet transmitted to the wireless power receiver includes information about the first interval, The first packet transmitted from the wireless power receiver includes information about a coefficient used to estimate the power loss corresponding to the first interval, The above estimation management unit estimates the power loss of the wireless power transmitter by referring to the coefficient and the factor used to estimate the power loss corresponding to the first interval. Wireless power receiver.

27. In paragraph 22, A first packet transmitted from a wireless power receiver includes information about a coefficient used to estimate the power loss corresponding to the second interval, The above estimation management unit estimates the power loss of the wireless power transmitter by referring to the coefficient and the factor used to estimate the power loss corresponding to the first interval. Wireless power receiver.

28. In paragraph 22, A first packet transmitted from a wireless power receiver includes information about a factor used to estimate the power loss corresponding to the second interval, The above estimation management unit estimates the power loss of the wireless power transmitter by referring to the coefficient used to estimate the power loss corresponding to the factor and the first interval. Wireless power receiver.

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