WO2014176860A1

WO2014176860A1 - Method and device for identifying valid load

Info

Publication number: WO2014176860A1
Application number: PCT/CN2013/083343
Authority: WO
Inventors: 李聃; 孙会; 龙海岸; 秦超; 娄兵兵
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: 2013-09-11
Publication date: 2014-11-06
Also published as: CN104124780A

Abstract

Method and device for identifying a valid load. The method comprises: entry of a receiving end into a power supply area is detected by a transmitting end, voltages at two ends of a transmitting end coil are collected (S101); if the voltages at the two ends of the transmitting end coil generate an ordered change, the receiving end is determined to be valid, and power supply is continued for the valid receiving end (S102); and, if the voltages at the two ends of the transmitting end coil generate no ordered change, the receiving end is determined to be invalid, and power supply is not provided for the invalid receiving end (S103). Upon detection of the entry of the receiving end into the power supply area, the voltages at the two ends of the transmitting end coil are collected, and the validity of a load is determined via the presence or absence of the ordered change in the voltages, the need for designing a modulation/demodulation circuit is obviated, thus allowing for low costs and low requirements for system stability.

Description

Method and device for identifying a payload

Technical field

The present invention relates to the field of radio energy transmission, and in particular, to a method and apparatus for identifying a payload. Background technique

"Radio Energy Transmission" is the use of a special device to convert the power of a power source into a wirelessly propagated energy, which in turn converts this energy back into electrical energy to wirelessly power the consumer.

Based on the inductively coupled power transmission technology, the wireless energy transmission system needs to identify the load at the receiving end and recognize the correct load before it can work. Otherwise, the magnetic field emitted by the transmitting end coil after the metal foreign object is placed, the metal foreign matter will be heated. It will burn the launch end and cause damage.

At present, the receiving end load identification work is based on the communication between the secondary side and the primary side, the modulation circuit is designed in the secondary circuit, and the demodulation circuit is designed in the primary circuit to realize the load identification, but the design needs to be designed. The modulation and demodulation circuit has high cost and requires great system stability.

Summary of the invention

The embodiment of the invention provides a method and system for identifying a payload, which aims to solve the problem of designing a modulation and demodulation circuit in the prior art.

The embodiment of the present invention is implemented by the method for identifying a payload. The method includes: detecting, by the transmitting end, that the receiving end enters the power supply area, and collecting voltages at both ends of the transmitting end coil; if the voltage at both ends of the transmitting end coil is generated Sequence change, determining that the receiving end is legal, and continuously supplying power to the legal receiving end; if the voltage at both ends of the transmitting end coil does not produce an orderly change, it is determined that the receiving end is illegal, and no power is supplied to the illegal receiving end.

An embodiment of the present invention further provides an apparatus for identifying a payload, where the apparatus includes:

a voltage collecting unit, configured to detect, by the transmitting end, that the receiving end enters the power supply area, and collects the voltage across the transmitting end coil; The receiving end legality judging unit is configured to determine that the receiving end is legal if the voltage at both ends of the transmitting end coil is changed, and the legal receiving end is continuously powered; if the voltage at both ends of the transmitting end coil does not produce an orderly change, determining The receiving end is illegal and does not supply power to the illegal receiving end.

The invention collects the voltage across the coil of the transmitting end after detecting that the receiving end enters the power supply area, judges the validity of the load by judging whether the voltage is in order, does not need to design a modulation and demodulation circuit, has low cost, and is stable to the system. Low requirements.

DRAWINGS

FIG. 1 is a flowchart of a method for identifying a payload according to an embodiment of the present invention;

2 is a flowchart of a method for identifying a payload according to an embodiment of the present invention;

FIG. 3 is a structural diagram of an apparatus for identifying a payload according to an embodiment of the present invention;

4 is a structural diagram of an apparatus for identifying a payload according to an embodiment of the present invention;

FIG. 5 is a schematic structural block diagram of a system for identifying a payload according to an embodiment of the present invention;

FIG. 6 is a schematic diagram showing the system energy conversion according to an embodiment of the present invention.

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 method for identifying a payload according to an embodiment of the present invention, which is described in detail as follows:

In step S101, the transmitting end detects that the receiving end enters the power supply area, and collects the voltages of the two ends of the transmitting end coil;

In the embodiment of the present invention, the transmitting end accesses the adapter power, enters the standby state, waits for the receiving end load to enter the power supply area, and when the load is placed in the power supply area, the system standby wake-up module recognizes that there is a The object enters, wakes up the transmitting end, enters the working state, and monitors the voltage change across the primary side coil, that is, the transmitting end coil, in real time.

In step S102, if the voltage across the coil of the transmitting end is changed in an orderly manner, it is determined that the receiving end is in a normal manner, and the legal receiving end is continuously powered;

In step S103, if the voltage across the coil of the transmitting end does not produce an orderly change, it is determined that the receiving end is illegal, and no power is supplied to the illegal receiving end.

In the embodiment of the present invention, the legality of the load at the receiving end is judged by monitoring the voltage change at both ends of the transmitting end coil, and an orderly change occurs when the voltage across the transmitting end coil is determined, and the load is determined to be a legal load, and when the transmitting end coil is two The terminal voltage does not produce an orderly change, such as only a small change at a time, that is, the load is determined to be an illegal load.

Wherein, the orderly change of the voltage across the transmitting end coil is specifically achieved by the following method: the coil entering the receiving end of the power supply area is rectified by the rectifying circuit to generate a stable power supply, enabling the receiving end and initializing;

The MCU at the receiving end controls the receiving end to access a dummy load through the GPIO, so that the receiving end resonant system drives the voltage across the transmitting end coil to generate the first mutation;

The MCU at the receiving end unloads the dummy load through the GPIO, so that the receiving end resonant system drives the voltage across the transmitting end coil to generate a second mutation;

When the transmitting end judges that the voltage across the coil of the transmitting end produces two orderly changes, it is determined that the receiving end is in use.

In the embodiment of the present invention, the orderly change of the voltage across the coil of the transmitting end can also be realized by the following method:

The coil entering the receiving end of the power supply area resonates and is rectified by a rectifying circuit to generate a stable power supply, enabling the receiving end and initializing; The MCU at the receiving end controls the receiving end to access a dummy load through the GPIO, so that the receiving end resonant system drives the voltage across the transmitting end coil to generate the first mutation;

The MCU at the receiving end controls the receiving end to access the dummy load through the GPIO, so that the receiving end resonant system drives the voltage across the transmitting end coil to generate a third mutation;

The MCU at the receiving end unloads the dummy load through the GPIO, so that the receiving end resonant system drives the voltage across the transmitting end coil to generate a fourth mutation;

When the transmitting end judges that the voltage across the coil of the transmitting end produces four orderly changes, it is determined that the receiving end is in use.

In the embodiment of the present invention, a dummy load is built in the receiving end, and the dummy load is a 5 ohm or 10 ohm resistor. If the legal load is connected, the receiving terminal MCU (Micro Controller Unit) passes the GPIO ( General Purpose Input Output (Frequency Input/Output) controls the receiving end to connect to a dummy load, causing the resonant system of the receiving end to generate voltage and current oscillations, which causes a large change in the voltage across the transmitting end coil. The MCU then controls the GPIO to transmit the dummy load. Unloading, at this time, the resonant system will generate a voltage and current oscillation, which will cause a large change in the voltage across the coil of the transmitting end. At this time, the voltage will fluctuate once, and the voltage across the coil of the transmitting end will produce two orderly changes. It is possible to distinguish between small changes in the voltage across the transmitting coil when an illegal load is placed.

In the embodiment of the present invention, the process of unloading the dummy load can be performed twice in succession, and the voltage at both ends of the transmitting end coil is generated in four orderly changes, or can be continuously loaded and unloaded three times, four times, and the like, and the difference can be generated. A small change in voltage across the transmitting coil when an illegal load is placed. After the transmitter sampling circuit collects this voltage fluctuation, it feeds back to the transmitting end MCU, and the transmitting end MCU judges that the existing load is a legal load, and continuously supplies power. FIG. 2 is a flowchart of a method for identifying a payload according to an embodiment of the present invention, which is described in detail as follows:

In step S201, the transmitting end detects that the receiving end enters the power supply area, and collects the voltages of the two ends of the transmitting end coil;

In step S202, if the voltage across the coil of the transmitting end is changed in an orderly manner, it is determined that the receiving end is in a normal manner, and the legal receiving end is continuously powered;

In step S203, if the voltage across the coil of the transmitting end does not produce an orderly change, it is determined that the receiving end is illegal, and no power is supplied to the illegal receiving end.

In step S204, when the voltage generated across the transmitting end coil is abruptly changed, determining whether the currently collected voltage value is the same as the voltage value collected in the standby state, step S205 is performed, otherwise step S206 is performed;

In step S205, it is determined that the load is removed, the transmitting end stops supplying power, and enters a standby state. In step S206, it is determined that the load is full, the transmitting end stops supplying power, or enters a trickle charging state, and enters a slow power supply.

In the embodiment of the present invention, in the process of charging the load, an ordered mutation is generated by collecting the voltage across the coil of the transmitting end to determine whether the load is removed. If the collected voltage does not change in an order, the load is still determined to be on the primary side. That is, the power supply area of the transmitting end, if the collected voltage produces an orderly change, continue to judge whether the collected voltage value is the same as the value collected in the standby state. If the same, the load is removed, and the transmitting end inverter circuit stops working. And enter the standby state; if not the same, it is determined that the load is completed, the power supply is stopped, or the load is judged to enter the trickle charge state, that is, the charge is about to be completed, and the power supply is slowly input.

Judging whether the load is full or entering the trickle charge state is specifically achieved by the following method: The MCU at the receiving end controls the receiving end to access a dummy load through the GPIO, so that the receiving end resonant system Driving the voltage across the coil of the transmitting end to produce a first mutation;

When the transmitting end judges that the voltage across the coil of the transmitting end produces four orderly changes, it is determined that the receiving end is fully charged or enters a trickle charging state.

In the embodiment of the present invention, when it is judged that the charging is full or enters the trickle charging state, the dummy load can also be loaded and unloaded once, and the voltage across the coil of the transmitting end is generated twice, or the dummy load can be loaded and unloaded twice. Three times and so on.

After it is determined that the load is completed, it is detected whether there is a change in the capacitance of the transmitting end, and then it enters the standby state. FIG. 3 is a structural diagram of an apparatus for effectively identifying a load according to an embodiment of the present invention, which is as follows:

The transmitting end of the voltage collecting unit 31 detects that the receiving end enters the power supply area, and collects the voltages of the two ends of the transmitting end coil;

In the embodiment of the present invention, the transmitting end accesses the adapter power, enters the standby state, and waits for the receiving end load to enter the power supply area. When a load is placed in the power supply area, the system standby wake-up module recognizes that foreign objects enter, and wakes up the transmitting end. Into the working state, real-time monitoring of the primary side coil, that is, the voltage change across the transmitting end coil.

The receiving end legality judging unit 32 determines that the receiving end is legal if the voltage at both ends of the transmitting end coil is changed, and continuously supplies power to the legal receiving end; if the voltage at both ends of the transmitting end coil does not generate order Change, determine that the receiving end is illegal, do not supply power to the illegal receiving end, and avoid the heat generating or burning of the transmitting end. In the embodiment of the present invention, when the voltage across the coil of the transmitting end produces an orderly change, it is determined that the load is a legal load, and the voltage across the coil of the transmitting end does not produce an orderly change, for example, only a small change. , that is, the load is determined to be an illegal load. When it is judged to be a legal load, the load is continuously supplied with power, and when it is judged that the load is an illegal load, it is not supplied with power.

The receiving end legality judging unit comprises: the receiving end initializing module 321 enters the receiving end of the power supply area, and the coil is resonated by the rectifying circuit to generate a stable power supply, enabling the receiving end and initializing; the first mutation module 322 receiving end MCU The GPIO controls the receiving end to access a dummy load, so that the receiving end resonant system drives the voltage across the transmitting end coil to generate the first mutation;

The second mutation module 323 receives the MCU through the GPIO to unload the dummy load, so that the receiving end resonance system drives the voltage across the transmitting end coil to generate a second mutation;

Judging the legal module 324 When the transmitting end judges that the voltage across the transmitting end coil produces two orderly changes, it is determined that the receiving end is legal.

In the embodiment of the present invention, the receiving end legality judging unit may further include: the receiving end initialization module 2 325 enters the receiving end of the power supply area, and the coil is resonated by the rectifying circuit to generate a stable power supply, enabling the receiving end and initializing;

The MCU of the first mutation module 326 receives the dummy load through the GPIO control receiving end, so that the receiving end resonant system drives the voltage across the transmitting end coil to generate the first mutation;

The second mutation module 327 receives the dummy load from the receiving end MCU through the GPIO, so that the receiving end resonant system drives the voltage across the transmitting end coil to generate a second mutation;

The third mutation module 328 receives the MCU through the GPIO control receiving end to connect the dummy load, so that the receiving end resonant system drives the voltage across the transmitting end coil to generate a third mutation;

The MCU of the receiving end of the fourth mutation module 329 unloads the dummy load through the GPIO, so that the receiving end is harmonic The vibration system drives the voltage across the coil of the transmitting end to produce a fourth mutation;

Judging Legal Module 2 3210 When the transmitting end judges that the voltage across the transmitting end coil produces four orderly changes, it is determined that the receiving end is legal.

In the embodiment of the present invention, by installing a dummy load on the receiving end, the dummy load is a 5 ohm or 10 ohm resistor. If the access is a legal load, the receiving end MCU controls the receiving end to access a fake through the GPIO). The load causes the voltage resonance of the resonant system at the receiving end to oscillate, which causes a large change in the voltage across the coil of the transmitting end. The MCU then unloads the dummy load by controlling the GPIO. At this time, the resonant system generates a voltage and current oscillation, which drives The voltage across the coil of the transmitting end changes greatly. At this time, the voltage generates a fluctuation, and the voltage across the coil of the transmitting end produces two orderly changes. It can also be used to unload the dummy load twice, three times, etc. by continuous loading, and so on. A small change in the voltage across the transmitter coil when the illegal load is placed.

The load removal or charging full judgment unit 33 generates a sudden change in the voltage generated across the transmitting end coil after the receiving end legality judging unit 32 continues to supply power to the legal receiving end, and judges the currently collected voltage value and the voltage collected in the standby state. Whether the value is the same; Yes, it is determined that the load is removed, the transmitting end stops supplying power, and enters the standby state. Otherwise, it is determined that the load is full, the transmitting end stops supplying power, or enters the trickle charging state, and enters the slow power supply.

In the embodiment of the present invention, in the process of charging the load, an ordered mutation is generated by collecting the voltage across the coil of the transmitting end to determine whether the load is removed. If the collected voltage does not change in an order, the load is still determined to be on the primary side. That is, the power supply area of the transmitting end, if the collected voltage produces an orderly change, continue to judge whether the collected voltage value is the same as the value collected in the standby state. If the same, the load is removed, and the transmitting end inverter circuit stops working. And enter the standby state; if not the same, it is determined that the load is completed, the power supply is stopped, or the load is judged to enter the trickle charge state, that is, the charge is about to be completed, and the power supply is slowly input. It is determined that the load charging is full or enters the trickle charging state by the following method: The MCU at the receiving end controls the receiving end to access a dummy load through the GPIO, so that the receiving end resonant system drives the voltage across the transmitting end coil to generate the first mutation;

FIG. 5 is a schematic block diagram of a system for identifying a payload according to an embodiment of the present invention, which is described in detail as follows:

The system mainly includes a transmitting unit and a receiving unit component:

The transmitting unit comprises a power module, an inverter circuit, a resonance unit, a sampling circuit, an MCU main control unit and the like.

The receiving unit comprises a rectifier module, an MCU main control unit, a resonance unit, a sampling circuit, a dummy load unit, an external load unit and the like.

FIG. 6 is a schematic diagram showing the energy conversion of the system according to the embodiment of the present invention. FIG. 5 and FIG. 6 respectively illustrate the working principle of the system from the circuit level and the energy level, which are detailed as follows: The radio energy transmission system is composed of a primary circuit and a secondary circuit. The primary circuit and the secondary circuit are respectively connected to the primary power system and the electrical equipment, and the primary circuit and the secondary circuit are transmitted by the magnetic field through the magnetic field; The function is to generate high-frequency current in the transmitting coil after the high-frequency conversion of the primary power system, and the pick-up mechanism in the secondary loop picks up energy in the changing magnetic field near the transmitting coil of the primary loop, and converts the high-frequency energy through the power converter. The entire radio energy transmission process is completed for the energy form required by the electrical equipment; one transmission coil can supply power to a plurality of pickup coils to realize simultaneous power supply of a plurality of electrical equipment.

The above description is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can also make several improvements and retouchings without departing from the principles of the present invention. It is considered as the scope of protection of the present invention.

Claims

WO 2014/176860 Quan Heij Letter of Request PCT/CN2013/083343

1. A method for identifying payload, characterized in that the method includes:

The transmitting end detects that a receiving end enters the power supply area, and collects the voltage at both ends of the transmitting end coil; if the voltage at both ends of the transmitting end coil changes in an orderly manner, it is determined that the receiving end is legal, and the legal receiving end is continuously powered; if the transmitting end coil If the voltage at both ends does not change in an orderly manner, the receiving end is determined to be illegal, and power is not supplied to the illegal receiving end.

2. The method of claim 1, wherein if the voltage at both ends of the coil at the transmitting end changes in an orderly manner, determining that the receiving end is legal includes:

The coil at the receiving end entering the power supply area resonates and is rectified by the rectifier circuit to generate a stable power supply, enable the receiving end and initialize;

The MCU at the receiving end controls the receiving end to connect a dummy load through GPIO, so that the resonant system at the receiving end drives the voltage at both ends of the transmitting end coil to produce the first sudden change;

The MCU at the receiving end unloads the false load through GPIO, causing the resonant system at the receiving end to drive the voltage across the coil at the transmitting end to produce a second sudden change;

When the transmitting end determines that the voltage at both ends of the transmitting end coil changes twice in an orderly manner, the receiving end is determined to be legal.

3. The method of claim 1, wherein if the voltage at both ends of the coil at the transmitting end changes in an orderly manner, determining that the receiving end is legal includes:

The MCU at the receiving end unloads the false load through GPIO, allowing the resonant system at the receiving end to drive the transmitter The MCU at the receiving end controls the receiving end to access the dummy load through GPIO, causing the resonant system at the receiving end to drive the voltage at both ends of the coil at the transmitting end to produce a third sudden change;

The MCU at the receiving end unloads the false load through GPIO, causing the resonant system at the receiving end to drive the voltage across the coil at the transmitting end to produce a fourth sudden change;

When the transmitting end determines that the voltage at both ends of the transmitting end coil changes four times in an orderly manner, the receiving end is determined to be legal.

4. The method according to claim 1, characterized in that, after the continuous power supply to the legal receiving end, the method further includes:

When the voltage across the coil at the transmitting end suddenly changes, it is determined whether the voltage value currently collected is the same as the voltage value collected in the standby state;

If it is, it is determined that the load has been removed, the transmitter stops supplying power, and enters the standby state. Otherwise, it is determined that the load is fully charged, and the transmitter stops supplying power, or enters the trickle charging state and enters slow power supply.

5. The method according to claim 2 or 3, characterized in that the dummy load is a resistor of 5 ohms or 10 ohms.

6. A device for identifying payload, characterized in that the device includes:

The voltage acquisition unit is used when the transmitter detects that the receiver enters the power supply area, and collects the voltage at both ends of the transmitter coil;

The receiving end legality judgment unit is used to determine that the receiving end is legal if the voltage at both ends of the transmitting end coil changes in an orderly manner, and to continuously supply power to the legal receiving end; if the voltage at both ends of the transmitting end coil does not change in an orderly manner, determine that the receiving end is legal. The receiving end is illegal, and power is not supplied to the illegal receiving end.

7. The device according to claim 7, characterized in that the receiving end legality judgment unit includes:

Receiver initialization module 1 is used to enter the power supply area after the coil of the receiving end resonates and the rectified power is circuit rectifier to generate stable power supply, enable and initialize the receiving end;

In the first mutation module 1, the MCU used for the receiving end controls the receiving end to connect a dummy load through GPIO, so that the resonant system of the receiving end drives the voltage at both ends of the transmitting end coil to produce the first mutation;

The second mutation module 1 is used for the MCU at the receiving end to unload the false load through GPIO, so that the resonant system at the receiving end drives the voltage at both ends of the coil at the transmitting end to produce a second mutation;

Legality determination module 1 is used to determine that the receiving end is legal when the transmitting end determines that the voltage at both ends of the coil at the transmitting end changes twice in an orderly manner.

8. The device according to claim 7, characterized in that the receiving end legality judgment unit includes:

The second initialization module of the receiving end is used to resonate the coil of the receiving end entering the power supply area and then rectify it through the rectifier circuit to generate a stable power supply, enable the receiving end and initialize it;

In the first mutation module 2, the MCU used for the receiving end controls the receiving end to access a dummy load through GPIO, so that the resonant system of the receiving end drives the voltage at both ends of the transmitting end coil to produce the first mutation;

The second mutation module 2 is used for the MCU at the receiving end to unload the false load through GPIO, so that the resonant system at the receiving end drives the voltage at both ends of the coil at the transmitting end to produce a second mutation;

The third mutation module is used for the MCU at the receiving end to control the receiving end to access the false load through GPIO, so that the resonant system at the receiving end drives the voltage at both ends of the coil at the transmitting end to produce a third mutation;

The fourth mutation module is used for the MCU at the receiving end to unload the false load through GPIO, so that the resonant system at the receiving end drives the voltage at both ends of the coil at the transmitting end to produce the fourth mutation;

The second legal determination module is used to determine that the receiving end is legal when the transmitting end determines that the voltage at both ends of the transmitting end coil changes four times in an orderly manner.

9. The device according to claim 7, characterized in that the device further includes: a load removal or full charge judgment unit, used to judge legal reception at the receiving end by the legality judgment unit. After the terminal continues to be powered, when a sudden change in the voltage across the transmitter coil is collected, it is judged whether the current collected voltage value is the same as the voltage value collected in the standby state; if so, it is determined that the load has been removed, the transmitter stops supplying power, and enters the standby state. Otherwise, it is determined that the load is fully charged, and the transmitter stops supplying power, or enters the trickle charging state and enters slow power supply.

10. The device according to claim 7 or 8, characterized in that the dummy load is a resistance of 5 ohms or 10 ohms.