KR20160132657A - Apparatus for determining abnormal status of wireless power transmission coil - Google Patents
Apparatus for determining abnormal status of wireless power transmission coil Download PDFInfo
- Publication number
- KR20160132657A KR20160132657A KR1020150065484A KR20150065484A KR20160132657A KR 20160132657 A KR20160132657 A KR 20160132657A KR 1020150065484 A KR1020150065484 A KR 1020150065484A KR 20150065484 A KR20150065484 A KR 20150065484A KR 20160132657 A KR20160132657 A KR 20160132657A
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- South Korea
- Prior art keywords
- transmission coil
- input voltage
- output voltage
- voltage
- wireless power
- Prior art date
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 141
- 230000002159 abnormal effect Effects 0.000 title abstract description 5
- 230000005856 abnormality Effects 0.000 claims abstract description 38
- 238000000034 method Methods 0.000 claims description 17
- 239000000306 component Substances 0.000 description 21
- 238000010586 diagram Methods 0.000 description 10
- 238000005516 engineering process Methods 0.000 description 5
- 230000005674 electromagnetic induction Effects 0.000 description 4
- 238000009774 resonance method Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000014509 gene expression Effects 0.000 description 2
- 238000003491 array Methods 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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Classifications
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- H02J17/00—
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
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- G01R31/02—
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- H02J7/025—
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
Description
The present invention relates to a radio power transmission coil abnormality determination device.
Wireless charging technology is a technology that can supply and supply power wirelessly without a connector for power transmission. Examples of the wireless charging technique include an electromagnetic induction method using a coil, a wireless power transmission method of converting electrical energy into microwave and transmitting the electromagnetic energy, and a method using resonance.
Wireless charging detects the device for wireless power charging at the wireless power transmitting side, and transmits power required for charging to power the device and confirm that the device is for wireless charging. If it is identified as a device for wireless charging, the wireless power receiving device will start charging by negotiating the power transfer.
Since the wireless power transmission uses a high voltage and a high current, the coil may cause short-circuit or short-circuit problems due to long-term heat, temperature, corrosion, vibration, impact, and impurities such as dust. When power is continuously supplied for the wireless power transmission in the state where the coil is disconnected or short-circuited, power transmission is not normally performed, and fire, internal circuit damage, and electric shock may occur.
Wireless charging technology is currently used in household appliances, mobile and car charging, and wireless charging technology will be used in ships and aircraft in the future. However, the above problem may arise because a method of effectively detecting a disconnection or a short circuit in a coil, which is a core component for implementing the wireless charging technology, is not implemented in the wireless charging system.
An object of the present invention is to provide a wireless power transmission coil abnormality determination device capable of detecting a disconnection or a short circuit in a transmission coil of a wireless charging system.
It is another object of the present invention to provide a radio power transmission coil abnormality judging device capable of discriminating whether a coil is open or shorted when a plurality of transmission coils are used and controlling power to be supplied.
According to an aspect of the present invention, there is provided a wireless power transmission apparatus comprising: an input voltage sensor provided at an input side of a wireless power transmission coil to detect an input voltage; An output voltage sensor provided on an output side of the transmission coil for detecting an output voltage; And a controller for determining that an abnormality has occurred in the transmission coil when a rate of the output voltage with respect to the input voltage is included in a preset range.
The controller may compare at least one of the input voltage and the output voltage with a threshold voltage to determine whether the transmission coil is short-circuited or disconnected when it is determined that an abnormality has occurred in the transmission coil.
The controller may determine that a disconnection occurs in the transmission coil when at least one of the input voltage and the output voltage exceeds the threshold voltage and may determine that a short circuit has occurred in the transmission coil when the voltage is lower than the threshold voltage.
The controller may set the threshold voltage to 30 to 70% of the input voltage applied to the transmission coil when the control coil is in a steady state.
The controller may determine that an abnormality has occurred in the transmission coil when the ratio of the output voltage to the input voltage is included in the preset range for a preset time.
The controller may determine that an abnormality has occurred in the transmission coil when the ratio of the output voltage to the input voltage exceeds 70%.
The controller may cut off the power supplied from the power source when at least one of the disconnection and the short circuit occurs in the transmission coil.
The input voltage sensor and the output voltage sensor may be provided for each of the transmission coils, and the controller may determine whether the transmission coil is open or shorted.
The control unit may cut off power supplied from the power source to the transmission coil when at least one of the disconnection and the short circuit occurs in the transmission coil.
The wireless power transmission coil abnormality determination apparatus of the present invention can detect when the transmission coil of the wireless charging system is disconnected or short-circuited.
Also, when a plurality of transmission coils are used, it is possible to determine whether the coil is open or short-circuited, and to control the supplied power.
1 is a block diagram of a wireless charging system according to an embodiment of the present invention,
2 is a conceptual diagram of a wireless power transmission coil abnormality determination apparatus according to an embodiment of the present invention,
3 is a block diagram of a wireless power transmission coil abnormality determination apparatus according to an embodiment of the present invention,
FIG. 4 is a conceptual diagram of a radio power transmission coil abnormality determination apparatus according to another embodiment of the present invention,
5 is a block diagram of a wireless power transmission coil abnormality determination apparatus according to another embodiment of the present invention,
FIG. 6 is a flowchart illustrating an operation of the wireless power transmission coil abnormality determination apparatus according to an exemplary embodiment of the present invention,
7 is a graph for explaining the operation of the controller according to an embodiment of the present invention,
8 is a graph for explaining the operation of the controller according to another embodiment of the present invention.
The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated and described in the drawings. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.
The terms including ordinal, such as second, first, etc., may be used to describe various elements, but the elements are not limited to these terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the second component may be referred to as a first component, and similarly, the first component may also be referred to as a second component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.
It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.
The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.
Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.
Hereinafter, embodiments will be described in detail with reference to the accompanying drawings, wherein like or corresponding elements are denoted by the same reference numerals, and redundant description thereof will be omitted.
FIG. 1 is a block diagram of a wireless charging system according to an embodiment of the present invention, and FIG. 2 is a conceptual diagram of a wireless power transmission coil abnormality determination apparatus according to an embodiment of the present invention.
1 and 2, the
The wireless
The wireless
The wireless
The
The AC current generated by the
The electric power transmitted to the receiving
The wireless power transmission coil
FIG. 3 is a block diagram of a wireless power transmission coil abnormality determination apparatus according to an embodiment of the present invention.
3, the wireless power transmission coil abnormality determination apparatus according to an embodiment of the present invention may include an
The
The
The
When the
The
The
If the
When a short circuit occurs in the
The
The wireless charging system according to the present invention can operate according to the power transmission steps defined in, for example, the International Standard for Wireless Power Consortium (WPC) wireless power transmission. At this time, the
The
FIG. 4 is a conceptual diagram of a wireless charging system according to another embodiment of the present invention, and FIG. 5 is a configuration block diagram of a wireless power transmission coil abnormality determination apparatus according to another embodiment of the present invention.
4 and 5, in a wireless charging system according to another embodiment of the present invention, a wireless
The
The
6 is a flowchart illustrating an operation of the wireless power transmission coil abnormality determination apparatus according to an exemplary embodiment of the present invention.
Referring to FIG. 6, first, the wireless power transmission coil abnormality detection device detects an input voltage and an output voltage applied to a transmission coil through an input voltage sensor and an output voltage sensor (S601).
The input voltage sensor and the output voltage sensor transmit the detected input voltage and output voltage to the control unit (S602).
The control unit determines whether the ratio of the output voltage to the detected input voltage is included in the preset range, and increases the counting number of the variable a when included in the preset range. If the ratio of the output voltage to the input voltage is not included in the preset range, the control unit initializes the value of the variable a (S603 to 604).
If the number of counting of the variable a exceeds the preset number n, the control unit determines that an abnormality has occurred in the transmission coil (S605 to S606).
The control unit compares at least one of the input voltage and the output voltage with the threshold voltage (S607).
If at least one of the input voltage and the output voltage is less than or equal to the threshold voltage, the controller determines that a short circuit has occurred in the transmission coil (S608). If the voltage exceeds the threshold voltage, the control unit determines that a disconnection occurs in the transmission coil.
If at least one of the short-circuit and the short-circuit occurs, the control unit controls the power supply to cut off power supplied to the transmission coil (S610).
The disconnection judgment algorithm and the paragraph judgment algorithm of the control unit are not necessarily performed according to a specific order and may be performed simultaneously according to the situation or a shortage judgment algorithm may be performed first.
7 is a graph for explaining the operation of the controller according to an embodiment of the present invention.
The graph on the left in Fig. 7 shows the voltage of the transmission coil when the steady state is present, and the graph on the right shows the voltage when the second transmission coil is disconnected.
Referring to FIG. 7, in the steady state, the input voltage of the second transmission coil is 35.5 V and the output voltage is 5.1 V, and the ratio of the output voltage to the input voltage is calculated to be about 14.37%. On the other hand, when the disconnection occurs, the input voltage of the second transmission coil is detected as 13.1V and the output voltage is detected as 12.8V, and the ratio of the output voltage to the input voltage is calculated to be about 97.71%. If a disconnection occurs in the transmission coil, resonance does not occur and normal power transmission is not performed. Therefore, the ratio of the output voltage to the input voltage is significantly higher than when the output voltage is normal.
8 is a graph for explaining the operation of the controller according to another embodiment of the present invention.
In FIG. 8, the graph on the left represents the voltage of the transmission coil when the steady state is present, and the graph on the right represents the voltage when the second transmission coil is short-circuited.
Referring to FIG. 8, in the steady state, the input voltage of the second transmission coil is 35.5 V and the output voltage is 5.1 V, and the ratio of the output voltage to the input voltage is calculated to be about 14.37%. On the other hand, when a short circuit occurs, the input voltage of the second transmission coil is detected as 23.4 V and the output voltage is detected as 23.1 V, and the ratio of the output voltage to the input voltage is calculated as about 98.72%. If the transmission coil is short-circuited, resonance does not occur and normal power transmission is not achieved. Therefore, the ratio of the output voltage to the input voltage is significantly higher than when the output voltage is normal. In addition, since a momentary overcurrent occurs when a short circuit occurs in the transmission coil, it can be confirmed that the numerical value of the input voltage or the output voltage is largely detected as compared with the case where the disconnection occurred in Fig.
As used in this embodiment, the term " portion " refers to a hardware component such as software or an FPGA (field-programmable gate array) or ASIC, and 'part' performs certain roles. However, 'part' is not meant to be limited to software or hardware. &Quot; to " may be configured to reside on an addressable storage medium and may be configured to play one or more processors. Thus, by way of example, 'parts' may refer to components such as software components, object-oriented software components, class components and task components, and processes, functions, , Subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and variables. The functions provided in the components and components may be further combined with a smaller number of components and components or further components and components. In addition, the components and components may be implemented to play back one or more CPUs in a device or a secure multimedia card.
It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention as defined by the following claims It can be understood that
100: Power supply
200: Wireless power transmitting device
210: transmission coil
220: Wireless power transmission coil abnormality determination device
221: Input voltage sensor
222: Output voltage sensor
223:
300: Wireless power receiving device
400:
Claims (9)
An output voltage sensor provided on an output side of the transmission coil for detecting an output voltage; And
And a controller for determining that an abnormality has occurred in the transmission coil when a rate of the output voltage with respect to the input voltage is included in a preset range.
Wherein the control unit compares at least one of the input voltage and the output voltage with a threshold voltage to determine whether the transmission coil is short-circuited or disconnected when it is determined that an abnormality has occurred in the transmission coil.
Wherein the control unit determines that a disconnection occurs in the transmission coil when at least one of the input voltage and the output voltage exceeds the threshold voltage and determines that a short circuit occurs in the transmission coil when the voltage is lower than the threshold voltage, Coil abnormality determination device.
Wherein the control unit sets the threshold voltage to 30 to 70% of an input voltage applied to the transmission coil when the control unit is in a steady state.
Wherein the controller determines that an abnormality has occurred in the transmission coil when the ratio of the output voltage to the input voltage is within a preset range for a preset period of time.
Wherein the controller determines that an abnormality has occurred in the transmission coil when the ratio of the output voltage to the input voltage exceeds 70%.
Wherein the control unit cuts off the power supplied from the power source when at least one of a short-circuit and a short-circuit occurs in the transmission coil.
Wherein the input voltage sensor and the output voltage sensor are provided for each of the transmission coils, and the controller determines whether the transmission coil is open or short-circuited.
Wherein the controller interrupts power supplied from the power source to the transmission coil when at least one of the disconnection and the short circuit occurs in the transmission coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020150065484A KR20160132657A (en) | 2015-05-11 | 2015-05-11 | Apparatus for determining abnormal status of wireless power transmission coil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020150065484A KR20160132657A (en) | 2015-05-11 | 2015-05-11 | Apparatus for determining abnormal status of wireless power transmission coil |
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| Publication Number | Publication Date |
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| KR20160132657A true KR20160132657A (en) | 2016-11-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| KR1020150065484A KR20160132657A (en) | 2015-05-11 | 2015-05-11 | Apparatus for determining abnormal status of wireless power transmission coil |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2019054578A (en) * | 2017-09-13 | 2019-04-04 | トヨタ自動車株式会社 | Power transmitting device, power receiving device and non-contact power transmission system |
-
2015
- 2015-05-11 KR KR1020150065484A patent/KR20160132657A/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2019054578A (en) * | 2017-09-13 | 2019-04-04 | トヨタ自動車株式会社 | Power transmitting device, power receiving device and non-contact power transmission system |
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