CN110707835A - Wireless charging receiving terminal - Google Patents
Wireless charging receiving terminal Download PDFInfo
- Publication number
- CN110707835A CN110707835A CN201911008834.6A CN201911008834A CN110707835A CN 110707835 A CN110707835 A CN 110707835A CN 201911008834 A CN201911008834 A CN 201911008834A CN 110707835 A CN110707835 A CN 110707835A
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- protection
- inductor
- inductance
- wireless charging
- power supply
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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
- H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
- H01F27/306—Fastening or mounting coils or windings on core, casing or other support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
- H01F27/402—Association of measuring or protective means
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/14—Inductive couplings
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a wireless charging receiving terminal, which comprises a main circuit, wherein the main circuit is internally provided with a receiving coil, a resonance circuit and a load, and is characterized by also comprising: the protective inductor is connected with the receiving coil in series, and the inductance value of the protective inductor is variable; the power supply unit supplies power to the protection inductor; the switch unit is connected in series between the power supply unit and the protection inductor and is provided with a sampling controller, and the sampling controller acquires the electrical parameters of the main line and controls the power supply unit and the protection inductor to be disconnected or communicated according to the electrical parameters. The wireless receiving terminal that charges of this application, protection inductance and receiving coil establish ties, and whether switch element control supplies power to the protection inductance, realizes the regulation to the inductance value of protection inductance to change the resonance parameter of receiving terminal, make receiving coil and transmitting coil's resonance state destroy, thereby no longer receive energy, avoided the damage of receiving terminal.
Description
Technical Field
The invention relates to a receiving end for wireless charging.
Background
In the wireless charging process, especially in the high-power wireless charging process, once the receiving end is unloaded, a great safety problem can be brought. For example, the wireless charging of the electric automobile mainly comprises a transmitting controller, a transmitting coil, a receiving coil and a receiving controller, and the basic principle is that a transmitting end forms a resonant circuit by the transmitting coil and a capacitor and transmits electromagnetic energy outwards, and a receiving end forms the resonant circuit by the receiving coil and the capacitor and receives the electromagnetic energy. The topological structure of the transmitting and receiving circuit is mainly divided into series resonance and parallel resonance, and in order to increase power and output current, the receiving end cannot be unloaded.
However, accidents can happen inevitably in the charging process, no matter the vehicle moves or the receiving end breaks down, the receiving end is possible to be unloaded, and as no physical circuit connection exists between the transmitting end and the receiving end of the wireless charging system, if no protection measures are adopted, the energy received by the receiving end cannot be released, the receiving end can be damaged, so that components such as a filter capacitor and the like are damaged, and the whole receiving end is damaged.
Protection for the idle condition of the receiving end is usually achieved by two-sided communication and information interaction between the transmitting end and the receiving end, and the transmitting end sends an instruction or the receiving end judges according to signals such as overcurrent and cuts off energy sending. Due to the delay and reliability problems of the two-side communication, the situation that the receiving end is damaged when the receiving end has no load and the like is still very likely to occur, and the method is not an effective protection mode.
Disclosure of Invention
In order to solve the above problems, the present invention provides a receiving end for wireless charging, which has a good idle protection function.
The utility model provides a wireless receiving terminal that charges, including the main circuit, receiving coil, resonant circuit and load have in the main circuit, its characterized in that still includes: the protection inductor is connected with the receiving coil in series, and the inductance of the protection inductor is variable; the power supply unit supplies power to the protection inductor; the switching unit is connected between the power supply unit and the protection inductor in series and is provided with a sampling controller, and the sampling controller acquires an electrical parameter of the main line; and controlling the power supply unit and the protection inductor to be disconnected or communicated according to the electrical parameter.
Preferably, the electrical parameter is voltage; when the voltage of the main line is larger than a preset voltage, the controller disconnects the power supply unit and the protection inductor.
Preferably, the protection inductors are two groups of saturable inductors which are connected in series in an opposite direction.
Preferably, the protection inductor is a coupling inductor and has a magnetic core, a first winding and a second winding are wound on the magnetic core, the first winding is connected in series with the receiving coil, and the second winding is communicated with the switching unit; and the mutual inductance of the first winding and the second winding is zero.
Preferably, the main line is further provided with a rectifier filter; and the sampling controller acquires the electrical parameters passing through the rectifier filter.
Preferably, the load is an electric device and/or a rechargeable battery.
Preferably, the sampling controller is a relay.
The wireless receiving terminal that charges of this application, protection inductance and receiving coil establish ties, and whether switch element control supplies power to the protection inductance, realizes the regulation to the inductance value of protection inductance to change the resonance parameter of receiving terminal, make receiving coil and transmitting coil's resonance state destroy, thereby no longer receive energy, avoided the damage of receiving terminal.
Drawings
Fig. 1 is a schematic diagram of a receiving end of wireless charging according to the present invention.
Reference numerals:
a battery load of 0; a receiving coil 1; a resonant circuit 2; a protection inductor 3; a switch unit 4; a power supply unit 5; a rectifier filter 6; a saturable inductor 31.
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 only and should not be construed as limiting the invention.
The invention discloses a receiving end (hereinafter referred to as receiving end) for wireless charging, which generally refers to a receiving end used on wireless charging equipment, and realizes wireless transfer of energy through resonance with a transmitting end. The receiving end has a main line, which is a line for converting received energy into electric energy for use or storage. The main line has a receiving coil 1 and a resonance circuit 2. The receiving coil 1 is used for matching with a transmitting coil of a transmitting end of wireless charging, and energy transmission is realized through resonance.
The receiving end further comprises a protection inductor 3, a switch unit 4 and a power supply unit 5. The protection inductor 3 is connected in series with the receiving coil 1, the power supply unit 5 supplies power to the protection inductor 3, and the switch unit 4 is connected in series between the power supply unit 5 and the protection inductor 3, and whether the power supply unit 5 can supply power to the protection inductor 3 is controlled by disconnecting or connecting the switch unit 4 (in fig. 1, the switch unit 4 part is drawn by using a dotted line in the case that the switch unit is connected with the power supply unit 5 and the protection inductor 3). Namely, the switching unit 4 controls the power supply unit 5 and the protection inductor 3 to be disconnected or connected. The control basis is determined according to the electrical parameters of the main line. The switching unit 4 has a sampling controller by which the above-mentioned "disconnection or connection" is realized. The sampling controller collects the electrical parameters of the main line and performs the operation of disconnection or connection according to the change of the electrical parameters. Preferably, the switch unit 4 may use a relay as a sampling controller, especially a voltage relay, and is controlled to be opened or closed according to the voltage. In this way, the electrical parameter of the main line, preferably the voltage, is known. The sampling controller of the switch unit 4 may be integrated in the switch unit 4, or may be an independent structure, and is electrically connected or communicatively connected to the switch unit 4.
It is noted that the use of a voltage relay as described above, and the selection of a voltage as representative of an electrical parameter, is an example. This example is also an example of the present application, which is relatively easy to implement in practical applications. The sampling controller, which is a component of the switch unit 4, may be in the form of a component module, or may be in the form of a circuit, that is, the sampling controller acquires electrical parameters through the circuit and controls whether the circuit is connected or not through the switch.
Certainly, the main line also has a load 0, otherwise, the main line is an idle line, and the load 0 is an electric device, or a rechargeable battery, or of course, both of them are simultaneously disposed in the main line.
The following describes how the above structure can achieve the protection function in dangerous situations (e.g. no load at the receiving end).
The inductance of the protection inductor 3 is variable, the inductance change is mainly realized by whether power is supplied or not, and the switching unit 4 changes the communication relation between the protection inductor 3 and the power supply unit 5. For example, the voltage in the main line exceeds a preset voltage, the switching unit 4 disconnects the line between the supply unit 5 and the protection inductance 3.
Specifically, the protection inductor 3 can generate saturation in different degrees according to the magnitude of the flowing current, so that the inductance of the inductor is changed. When no current flows, the magnetic core is not saturated, and the inductance is maximum; the inductance is minimal when the injected current fully saturates the core. That is, the switching unit 4 is closed and the power supply unit 5 supplies power to the protection inductance 3 to saturate it, and it should be noted that the power supply amount of the power supply unit 5 is sufficient to saturate the protection inductance 3 here. The switch unit 4 is turned on, the power supply unit 5 stops supplying power to the protection inductor 3, the protection inductor 3 is not saturated, and the inductor is increased at the moment. In the present application, since the switch unit 4 has two states of open and closed, the current flowing through the protection inductor 3 is simply divided into "current" and "no current". It is mentioned above that "the protection inductor 3 can produce different degrees of saturation depending on the magnitude of the current flowing through, and" with current "and" without current "belong to different current magnitudes.
Preferably, the protection inductors 3 are two sets of saturable inductors 31 connected in series in an opposite direction. The saturable inductor 31 is internally provided with a magnetic core, when the main line has dangerous conditions such as no load and the like, the voltage of the main line can be increased, the switch unit 4 is disconnected at the moment, the protection inductor 3 is not electrified, the magnetic core is unsaturated, the two coupling inductors are connected in series, the inductance is the largest, the large inductance is connected in series to the receiving coil 1 at the moment, the resonance of the receiving coil and the transmitting coil is damaged, and the wireless function is stopped; during normal charging activity, the switch unit 4 is closed, the power supply unit 5 supplies power to the protection inductor 3, the magnetic core is fully saturated due to injected current, the inductor is minimum, and the receiving coil 1 is normal and resonates with the transmitting coil. During wireless charging, the induced voltages generated on the coupling inductors of the two saturation inductors 31 connected in series in reverse direction have the same magnitude but opposite polarities, and can be cancelled out. The main principle of wireless charging is that alternating current input by an alternating current power supply is converted into direct current through a rectifying and filtering unit, is converted into high-frequency alternating current through an inversion unit, and is loaded into a transmitting coil to generate high-frequency oscillation, so that an alternating magnetic field is generated above the transmitting coil, an induction alternating current is generated after the receiving coil 1 induces the magnetic field, the alternating current is converted into direct current, and the direct current is transmitted to a battery load and the like to charge a battery.
Before the wireless charging starts, the switch unit 4 is closed, the power supply unit 5 supplies direct current to the protection inductor 3, so that the inductor is in a saturated state, the transmitting end and the receiving end can be in a resonance state at the moment, and the wireless charging can be started to be guaranteed at any time. When wireless charging starts, power is continuously supplied to the protection inductor 3, the resonance characteristic of the receiving end cannot be changed, and the transmitting end and the receiving end start to transfer energy through resonance. Here, before the wireless charging is started, it means that the wireless charging is ready to be performed, but the charging is not actually started, or it may be understood as a preparation stage before the charging, in which the protection inductor 3 is supplied with power so that the transmitting terminal and the receiving terminal may be in a resonant state. If the wireless charging is not desired, the power can not be supplied to the protection inductor 3, and at the moment, the inductance of the protection inductor 3 is the maximum, so that the receiving coil 1 cannot resonate with the transmitting coil.
When an accident occurs, such as no load at the receiving end, etc., the switching unit 4 may detect the change of the electrical parameter of the main line, such as the voltage increase exceeding the preset voltage, and disconnect the power supply from the power supply unit 5 to the protection inductor 3, so that the magnetic core is not saturated, the inductance is increased, and the resonance parameter of the receiving coil 1 connected in series with the magnetic core is changed, so that the receiving coil cannot continue to resonate with the transmitting coil. Stopping supplying power to the protection inductor 3 is equivalent to connecting an inductance value in series with the receiving coil 1, so that the resonance parameter of the receiving end is changed, the transmitting end and the receiving end are no longer in a resonance state, the receiving end cannot continuously receive the energy transmitted by the transmitting end, and the receiving end and the load can be protected from being damaged even if the transmitting end is not cut off in time.
The power supply unit 5 may be an independent power supply, such as the level of the vehicle. The power supply unit 5 may also be a rechargeable battery at the receiving end of the wireless charging.
Further, a rectifier filter 6 is arranged on the main line; the sampling controller obtains the electric parameters after passing through the rectifier filter 6, and adjusts whether the protection inductor 3 can be supplied with power according to the electric parameters. The rechargeable battery is also connected after the rectifier filter 6.
With regard to the protective inductance 3, the aim is to achieve a variation of the inductance so that the receiving coil 1 and the transmitting coil can be prevented from resonating in special situations (such as the above-mentioned no-load). In the above example, the protection inductor 3 may be two sets of saturable inductors 31 connected in series in an opposite direction, and other structures may be used to adapt to the present application.
For example, the protection inductor 3 is a coupling inductor which has at least one magnetic core. And the magnetic core is wound with a winding which is a first winding and a second winding respectively, the first winding is connected with the receiving coil 1 in series, and the second winding is communicated with the switch unit 4. The mutual inductance of the first winding and the second winding is zero.
From the above description, it can be understood that the present application can be briefly summarized as follows: the inductance of the protective inductor 3 is adjusted to influence whether (or effectively) the receiving coil 1 can resonate with the transmitting coil, so that the protective function is realized. The second winding is connected to the switching unit 4 in order to influence the inductance of the first winding in series with the receiving coil 1 under the action of the switching unit 4. The switching unit 4 can here achieve the above-mentioned influence by controlling whether the current value is passed through the second winding, i.e. by supplying or not supplying power.
Specifically, no power is supplied to the second winding, that is, no power is supplied to the second winding, the magnetic core is not saturated at this time, the first winding has a first self-inductance which is the largest at this time, and the first self-inductance is equivalent to the inductance of the protection inductance 3, which is connected in series to the receiving coil 1, and the resonance of the receiving coil 1 and the transmitting coil is affected.
When a current value is passed through the second winding, i.e. the power supply unit 5 supplies power to it, to saturate the magnetic core, the first winding now has a second self-inductance, which is smaller than the first self-inductance, and the second self-inductance is preferably 0, i.e. the amount of power supplied is sufficient to saturate the magnetic core. The second self-inductance may also be equivalent to the inductance of the protection inductance 3, and may not be 0, and may be in a range that does not affect the normal operation of the receiving coil 1.
The specific values of the first self-inductance and the second self-inductance are not limited in this application, because different device choices and the like may vary according to different application scenarios, but the principles followed by them are the same, that is: when the operation of the receiving coil 1 needs to be influenced to play a role of protection and the like, power is not supplied to the second winding, and the magnetic core cannot be saturated, so that the first winding can generate a large first self-inductance, and the first self-inductance is connected in series to the receiving coil 1 to destroy the original resonance. During normal charging, the second winding is supplied with current enough to saturate the magnetic core, so that the first winding has a smaller or 0 second self-inductance, and the receiving coil 1 works normally, that is, the power supply amount of the power supply unit 5 makes the first winding have the smaller or 0 second self-inductance, where the smaller second self-inductance is a value that does not affect the normal work of the receiving coil 1. Of course, the magnetic core is saturated or unsaturated, and is not necessarily in a fixed state, and it is considered that the protective inductor 3 may be allowed to complete its operation in an inductance equivalent to the first self-inductance and the second self-inductance, that is, the above-mentioned "saturation" does not necessarily mean the saturation in the physical sense, and it is considered that the "saturation" is achieved.
The construction, features and functions of the present invention are described in detail in the embodiments illustrated in the drawings, which are only preferred embodiments of the present invention, but the present invention is not limited by the drawings, and all equivalent embodiments modified or changed according to the idea of the present invention should fall within the protection scope of the present invention without departing from the spirit of the present invention covered by the description and the drawings.
Claims (7)
1. A receiving terminal for wireless charging, comprising a main circuit, wherein the main circuit is provided with a receiving coil (1), a resonance circuit (2) and a load (0), and the receiving terminal is characterized by further comprising:
a protection inductor (3) connected in series with the receiving coil (1), wherein the inductance of the protection inductor (3) is variable;
a power supply unit (5) for supplying power to the protection inductor (3);
the switching unit (4) is connected in series between the power supply unit (5) and the protection inductor (3), and the switching unit (4) is provided with a sampling controller which acquires an electrical parameter of the main line and controls the power supply unit (5) and the protection inductor (3) to be disconnected or communicated according to the electrical parameter.
2. The receiving end of wireless charging according to claim 1,
the electrical parameter is voltage;
when the voltage of the main line is larger than a preset voltage, the controller enables the power supply unit (5) and the protection inductor (3) to be disconnected.
3. The receiving end of wireless charging according to claim 1,
the protection inductor (3) is two groups of saturable inductors (31) which are connected in series in an opposite direction.
4. The receiving end of wireless charging according to claim 1,
the protection inductor (3) is a coupling inductor and is provided with a magnetic core, a first winding and a second winding are wound on the magnetic core, the first winding is connected with the receiving coil (1) in series, and the second winding is communicated with the switch unit (4); and the mutual inductance of the first winding and the second winding is zero.
5. The receiving end of wireless charging according to claim 1,
the main line is also provided with a rectifier filter (6);
and the sampling controller acquires the electrical parameters after passing through the rectifier filter (6).
6. The receiving end of wireless charging according to claim 1,
the load (0) is a consumer and/or a rechargeable battery.
7. The receiving end of wireless charging according to claim 1,
the sampling controller is a relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911008834.6A CN110707835A (en) | 2019-10-22 | 2019-10-22 | Wireless charging receiving terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911008834.6A CN110707835A (en) | 2019-10-22 | 2019-10-22 | Wireless charging receiving terminal |
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| Publication Number | Publication Date |
|---|---|
| CN110707835A true CN110707835A (en) | 2020-01-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911008834.6A Pending CN110707835A (en) | 2019-10-22 | 2019-10-22 | Wireless charging receiving terminal |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112350445A (en) * | 2020-09-25 | 2021-02-09 | 北京有感科技有限责任公司 | Receiving terminal of wireless charging system |
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2019
- 2019-10-22 CN CN201911008834.6A patent/CN110707835A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112350445A (en) * | 2020-09-25 | 2021-02-09 | 北京有感科技有限责任公司 | Receiving terminal of wireless charging system |
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Address after: 230088 China (Anhui) pilot Free Trade Zone, Hefei, Anhui Province a3-15, 14 / F, block a, building J1, phase II, innovation industrial park, No. 2800, innovation Avenue, high tech Zone, Hefei Applicant after: Hefei Yougan Technology Co.,Ltd. Address before: 100085 room 412, block D, 9 Shangdi 3rd Street, Haidian District, Beijing Applicant before: BEIJING INVISPOWER TECHNOLOGY Co.,Ltd. |
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