WO2014176837A1

WO2014176837A1 - A method and device for multi-coil wireless electric energy transmission

Info

Publication number: WO2014176837A1
Application number: PCT/CN2013/080768
Authority: WO
Inventors: 李聃; 孙伟; 张从鹏; 董秀莲; 刘宝; 刁德鹏
Original assignee: 海尔集团技术研发中心; 海尔集团公司
Priority date: 2013-04-28
Filing date: 2013-08-02
Publication date: 2014-11-06
Also published as: CN104124771A

Abstract

A method and device for multi-coil electric energy transmission. The method comprises: a. a transmitting end detects whether or not a receiving end is placed into a power supply area, and if yes, proceed to step b; b. resonant units corresponding to the receiving end are positioned by employing a polling scan mode; c. whether or not the receiving end is valid is determined, if yes, proceed to step d, and if not, the resonant units do not transmit electric energy to the receiving end; and, d. the resonant units are connected to an inverter circuit via a switch circuit, the inverter circuit adjusts total output power on the basis of the number of currently connected resonant units, and the resonant units transmit electric energy to the receiving end; all of the resonant units of the transmitting end share one inverter circuit, and the structures and parameters of the resonant units are identical. The method obviates the need for precise alignment with the transmitting end, allows for positioning of the resonant units at where the receiving end is located, and allows for transmission of electric energy to multiple receiving ends and for determination of limitations of the receiving ends.

Description

Multi-coil radio energy transmission method and device

Technical field

The present invention relates to the field of radio energy technologies, and in particular, to a multi-coil radio energy transmission method and apparatus.

Background technique

At present, in people's daily life, household appliances are mainly powered by wired means, and wired power supply must be arranged, which will increase the inconvenience of use, and the wired mode needs to use sockets to increase the use of electrical appliances. Location restrictions.

In order to avoid the inconvenience caused by wired power transmission, wireless power supply technology applications have begun to appear. The technical principle adopted is mainly electromagnetic induction type wireless energy transmission, but most of the existing technologies need to accurately align the transmitting end and the receiving end. The location, and the one-on-one way of working, brings inconvenience to the user.

Summary of the invention

The present invention provides a multi-coil radio energy transmission method and apparatus for solving the problem of requiring precise alignment of the positions of the transmitting end and the receiving end in the prior art, and only one-to-one transmission.

The embodiment of the present invention is implemented as such, a multi-coil radio energy transmission method, and the method includes:

a. The transmitting end detects whether a receiving end is placed in the power supply area, and if so, continues to step b;

b. locating the resonant unit corresponding to the receiving end by using a polling scan mode;

c. determining whether the receiving end is legal, and if so, continuing to step d, otherwise, the resonating unit does not transmit electrical energy to the receiving end;

d. The resonant unit is connected to the inverter circuit through a switching circuit, and the inverter circuit adjusts the total output power according to the number of resonant units currently connected, and the resonant unit transmits electrical energy to the receiving end; Wherein, all the resonating units at the transmitting end share an inverter circuit, and the structure and parameter values of each resonating unit are the same.

The embodiment of the present invention further provides a multi-coil radio energy transmission device, where the device includes: a receiving end detecting unit, configured to detect whether a receiving end is placed in a power supply area, and if so, perform a polling scanning unit;

a polling scanning unit, configured to locate a resonating unit corresponding to the receiving end by using a polling scanning mode; a receiving end legal determining unit, configured to determine whether the receiving end is legal, and if yes, enter a power transmission unit, otherwise, The resonant unit does not transmit electrical energy to the receiving end;

a power transmission unit, configured to connect the resonant unit to an inverter circuit through a switch circuit, the inverter circuit adjusts a total output power according to a number of currently connected resonant units, and the resonant unit transmits power to the receiving end;

Wherein, all the resonating units at the transmitting end share an inverter circuit, and the structure and parameter values of each resonating unit are the same.

The invention detects the presence or absence of the receiving end in the power supply area, achieves the purpose of not accurately aligning the transmitting end, collects the voltage and current of each resonant unit by polling, thereby positioning the resonant unit where the receiving end is located, and designing all the resonant units to share one inverse The variable circuit is connected to the inverter circuit through the switch circuit, and the power can be transmitted to the plurality of receiving ends, and the validity of the receiving end is determined by identifying the ID information of the receiving end.

DRAWINGS

1 is a flow chart of a multi-coil radio energy transmission method provided in an embodiment of the present invention; FIG. 2 is a structural diagram of a multi-coil radio energy transmission apparatus provided in an embodiment of the present invention; FIG. 3 is provided in an embodiment of the present invention. The multi-coil radio energy transmission system circuit is composed of a module diagram. detailed description

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

FIG. 1 is a flowchart of a multi-coil radio energy transmission method according to an embodiment of the present invention, which is as follows:

In step S101, the transmitting end detects whether a receiving end is placed in the power supply area, and if so, executing step S102;

In the embodiment of the present invention, the power supply area is an area within a certain range of the resonance unit, and it is not necessary to accurately align each of the resonance units, and the receiving end is detected within a preset range.

In step S102, the resonating unit corresponding to the receiving end is located in a polling scan mode; in the embodiment of the present invention, the polling scan mode positioning method is adopted, by sampling the voltage or current of each resonating unit, according to The change in the state value of the voltage or current determines that the receiving end is located in the corresponding resonant unit.

In step S103, it is determined whether the receiving end is legal, and if so, then step S104 is performed, otherwise, step S105 is performed;

In the embodiment of the present invention, the receiving end may be a receiving end of the system, or may be a power receiving end of the household appliance. Of course, it may also be any material containing a metal material, but for a general metal material, if The power supply causes the transmitter to generate heat, or even burns. Therefore, in the present invention, the legitimacy judgment of the receiving end is increased, thereby improving the security of the wireless power supply, and the ID information of the receiving end can be used to the receiving end. Legitimacy is identified.

When the ID signal sent by the receiving end is received within a predetermined time, and the transmitting end recognizes that the ID in the ID signal is a legal ID, the transmitting end performs power transmission. Did not receive the connection within the preset time The ID information sent by the receiving end, for example, waiting for the ID signal to time out, etc., can determine that the receiving end of the resonating unit is an illegal receiving end, immediately stop the operation of the resonating unit, and avoid transmitting power to the illegal receiving end. If the ID information sent by the receiving end is received, the ID information is further identified to determine whether the receiving end is legal. If it is determined to be illegal, the operation of the resonating unit is also stopped immediately.

In step S104, the resonant unit is connected to the inverter circuit through a switching circuit, and the inverter circuit adjusts the total output power according to the number of resonant units currently connected, and the resonant unit transmits electrical energy to the receiving end; In the example, the inverter circuit obtains the number of resonant units currently connected, and finds the matched output power from the matching table of the preset number of resonant units and the output power, and adjusts the total output power to the matched output power. In addition, the inverter circuit can dynamically adjust the total output power according to the obtained number of currently accessed resonant units, for example, detecting the voltage or current of the resonant unit or the inverter circuit, and comparing with the reference value, according to the difference value. Adjust the total output power.

All the resonant units at the transmitting end have a common inverter circuit, which simplifies the complexity of a conventional inverter with one inverter circuit and reduces the cost of the system. Each resonant unit shares a set of inverter circuits. During operation, the selection circuit of the resonant unit is connected to the inverter circuit through switch control to generate the required electromagnetic field to emit electrical energy. Each resonant unit consists of an inductive coil and a capacitor in parallel. Each resonant unit has the same inductance value and the same capacitance value, so the resonant frequency value is also the same. When a receiving end is placed in the power supply area, the MCU Micro Control Unit, the control circuit of the MCU Micro Control Unit, the control circuit uses the polling positioning method to determine which resonant unit the receiving end is located, and the system adopts a voltage or current detecting circuit. The preferred identification and control method selects the power transmission of the resonant unit and the operating parameters of the inverter circuit to achieve power transmission control.

In the process of transmitting power to the receiving end by the resonant unit, the receiving end sends the ID information to the transmitting end through the interval time, and the transmitting end can judge the existence state of the receiving end by using the ID information sent by the receiving end, thereby determining whether the resonant unit needs to remain in the working state. If the ID signal sent by the receiver is interrupted, then It is determined that the receiving end has left the power supply area, and the system will stop responding to the work of the transmitting end resonant unit in time, and stop transmitting power to the receiving end to reduce the reactive power output of the system power.

Similarly, in the process of transmitting power to the receiving end by the resonant unit, if the power transmitting end information sent by the receiving end stops, the transmitting end stops transmitting power to the receiving end; if all the resonant units of the transmitting end are not working, the system goes to the standby state. .

In step S105, the resonating unit does not transmit electrical energy to the receiving end.

FIG. 2 is a structural diagram of a multi-coil radio energy transmission device according to an embodiment of the present invention, which is described in detail as follows:

The receiving end detecting unit 21 is configured to detect whether a receiving end is placed in the power supply area, and if so, to perform a polling scanning unit.

In the embodiment of the present invention, the transmitting end detects whether the receiving end is placed in the power supply area, and then enters the resonating unit corresponding to the positioning receiving end of the polling scanning unit, otherwise continues to detect.

The polling scanning unit 22 uses the polling scanning mode to locate the resonating unit corresponding to the receiving end.

In the embodiment of the present invention, by using the polling scan mode positioning method, by sampling the voltage or current of each resonant unit, it is determined that the receiving end is located at the corresponding resonant unit according to the change of the state value of the voltage or current.

The receiving end legal judgment unit 23 judges whether the receiving end is legal, and if so, enters the power transmitting unit, otherwise, the resonant unit does not transmit power to the receiving end.

In the embodiment of the present invention, in order to avoid power transmission to the ineffective receiving end, the transmitting end is heated or even burned, the judgment of the legality of the receiving end is increased, and the security of the wireless power supply is improved.

The ID of the receiving end is identified by the ID information sent by the receiving end, and the ID signal sent by the receiving end is received within a predetermined time, and the transmitting end recognizes that the ID in the ID signal is a legal ID, The receiving end performs power transmission. The power transmission unit 24 connects the resonance unit to the inverter circuit through a switching circuit, and the inverter circuit adjusts the total output power according to the number of the currently connected resonance units, and the resonance unit transmits the power to the receiving end.

In the embodiment of the present invention, the inverter circuit acquires the number of resonant units currently accessed, and finds a matching output power from a matching table of the number of resonant units and output powers preset, and adjusts the total output power to the matched Output Power.

All the resonating units at the transmitting end have a common inverter circuit. When there is resonance to work, the selection circuit of the resonating unit is connected to the inverter circuit through the switch control to generate the required electromagnetic field to transmit electric energy. Each resonant unit consists of an inductive coil and a capacitor in parallel. Each resonant unit has the same inductance value and the same capacitance value, so the resonant frequency value is also the same. When a receiving end is placed in the power supply area, the MCU (Micro Control Unit) control circuit uses the polling positioning method to determine which resonant unit the receiving end is located through the resonant unit selection circuit module, and the system adopts a voltage or current detecting circuit. The preferred identification and control method selects the power transmission of the resonant unit and the operating parameters of the inverter circuit to achieve power transmission control.

The ID signal interrupting unit 25 interrupts the ID signal transmitted by the receiving end after the power transmitting unit transmits the power to the receiving end, and the transmitting end stops transmitting power to the receiving end.

In the embodiment of the present invention, in the process of transmitting the electrical energy to the receiving end, the receiving end sends the ID information to the transmitting end through the interval, and the transmitting end can determine the existence state of the receiving end by using the ID information sent by the receiving end, thereby determining Whether the resonant unit needs to remain in working state, if the ID signal sent by the receiving end is interrupted, it is determined that the receiving end has left the power supply area, the system will stop responding to the working of the transmitting end resonant unit in time, and stop transmitting power to the receiving end to reduce the system. Reactive output of power.

The standby transfer unit 26 power transmission unit after the resonance unit transmits power to the receiving end, the receiving end The transmitted power transmission end information, the transmitting end stops transmitting power to the receiving end; if all the resonant units of the transmitting end are not working, the system goes to the standby state.

In the embodiment of the present invention, in the process of transmitting power to the receiving end, if the power transmission end information sent by the receiving end is sent, the transmitting end stops transmitting power to the receiving end; if all the resonant units of the transmitting end are not working, The system goes to standby.

FIG. 3 is a schematic diagram of a circuit component module of a multi-coil radio energy transmission system according to an embodiment of the present invention, which is described in detail as follows:

The multi-coil radio energy transmission system provided by the present invention includes an MCU control circuit, a system trigger circuit, a plurality of resonance units, a full bridge inverter circuit, a voltage current detecting circuit, and a resonance unit selection circuit.

When a receiving end is placed in the power supply area, the resonant unit selecting circuit determines the resonant unit where the receiving end is located by using a polling scanning positioning method, and the voltage current detecting circuit selects and controls the power transmitting and inverting circuit of the resonant unit by using the identification and control method. The working parameters, or semi-closed loop control mode, means that the voltage and current of the resonant unit are collected in real time, and the output power is controlled according to a specific algorithm of power transmission, thereby realizing power transmission control.

In the embodiment of the present invention, the circuit module has a common inverter circuit, which simplifies the complexity of each inverter unit in the conventional method, and reduces the cost of the system. Each resonance unit shares a set of inverters. The circuit, when there is a resonance unit to work, the resonance unit selection circuit is connected to the full-bridge inverter circuit through the switch control to generate the required electromagnetic field to emit electric energy.

The invention detects the presence or absence of the receiving end in the power supply area, achieves the purpose of not accurately aligning the transmitting end, collects the voltage and current of each resonant unit by polling, thereby positioning the resonant unit where the receiving end is located, and designing all the resonant units to share one inverse The variable circuit is connected to the inverter circuit through the switch circuit, and the power can be transmitted to the plurality of receiving ends, and the ID information is recognized by the receiving end to determine the receiving. The effectiveness of the end.

Claims

WO 2014/176837 Claims PCT/CN2013/080768

1. A multi-coil wireless power transmission method, characterized in that the method includes:

a. The transmitter detects whether there is a receiver placed in the power supply area. If so, continue to step b;

b. Use polling scanning mode to locate the resonant unit corresponding to the receiving end;

c. Determine whether the receiving end is legal. If so, continue to step d. Otherwise, the resonant unit does not transmit power to the receiving end;

d. Connect the resonant unit to the inverter circuit through the switch circuit, the inverter circuit adjusts the total output power according to the number of currently connected resonant units, and the resonant unit transmits electric energy to the receiving end;

Among them, all resonant units at the transmitter share an inverter circuit, and the structure and parameter values of each resonant unit are the same.

2. The method according to claim 1, characterized in that, using the polling scanning mode to locate the resonant unit corresponding to the receiving end is specifically:

The voltage or current of each resonant unit is sampled, and based on changes in the state value of the voltage or current, it is determined that the receiving end is located in the corresponding resonant unit.

3. The method according to claim 1, characterized in that: judging whether the receiving end is legal, and if so, continue to step d, specifically:

If the ID signal sent by the receiving end is received within the predetermined time, and the transmitting end recognizes that the ID in the ID signal is a legal ID, step d is continued.

4. The method of claim 1, wherein the inverter circuit adjusts the total output power according to the number of currently connected resonant units as:

The inverter circuit obtains the number of currently connected resonant units, finds the matching output power from the preset matching table between the number of resonant units and the output power, and adjusts the total output power to the matching output power.

5. The method according to claim 1, characterized in that the inverter circuit is configured according to the currently connected The total output power adjusted by the number of resonant units includes:

The inverter circuit detects the voltage or current of the resonant unit or inverter circuit, compares it with the reference value, and adjusts the total output power based on the difference in comparison.

6. The method of claim 1, wherein after the resonant unit transmits electric energy to the receiving end, it further includes:

The ID signal sent by the receiving end is interrupted, and the transmitting end stops transmitting power to the receiving end.

7. The method of claim 1, wherein after the resonant unit transmits electric energy to the receiving end, it further includes:

In response to the power transmission end information sent by the receiving end, the transmitting end stops transmitting power to the receiving end; if all the resonant units at the transmitting end are not working, the system enters a standby state.

8. A multi-coil wireless power transmission device, characterized in that the device includes:

The receiving end detection unit is used by the transmitting end to detect whether there is a receiving end placed in the power supply area, and if so, execute the polling scanning unit;

The polling scanning unit is used to locate the resonance unit corresponding to the receiving end using the polling scanning mode; the receiving end legality judgment unit is used to judge whether the receiving end is legal, and if so, enter the power transmission unit; otherwise, The resonant unit does not transmit electrical energy to the receiving end;

An electric energy transmission unit is used to connect the resonant unit to the inverter circuit through a switching circuit. The inverter circuit adjusts the total output power according to the number of currently connected resonant units. The resonant unit transmits electric energy to the receiving end;

9. The device according to claim 8, wherein the use of polling scanning mode to locate the resonant unit corresponding to the receiving end specifically includes: sampling the voltage or current of each resonant unit, It is judged that the receiving end is located in the corresponding resonance unit according to the change of the state value of the voltage or current; the judgment of whether the receiving end is legal, and if so, entering the power transmission unit is specifically: receiving the receiving end within a predetermined time The ID signal is sent, and the transmitting end recognizes that the ID in the ID signal is a legal ID, then it enters the power transmission unit;

The inverter circuit adjusts the total output power according to the number of currently connected resonant units as follows: The inverter circuit obtains the currently connected number of resonant units, and finds a match from the preset matching table between the number of resonant units and the output power. The output power is adjusted to match the total output power.

10. The device according to claim 8, characterized in that, the device further includes:

The ID signal interruption unit is used to interrupt the ID signal sent by the receiving end after the power transmission unit transmits electric energy to the receiving end in the resonance unit, and the transmitting end stops transmitting electric energy to the receiving end.

11. The device according to claim 8, characterized in that, the device further includes:

The standby transfer unit is used for the power transmission unit. After the resonance unit transmits power to the receiving end, the receiving end sends the power transmission end information, and the transmitting end stops transmitting power to the receiving end; if all the resonant units of the transmitting end If none of them are working, the system will enter standby state.