CN108092420B - Control method of electric energy receiving end and wireless electric energy transmission device - Google Patents
Control method of electric energy receiving end and wireless electric energy transmission device Download PDFInfo
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- CN108092420B CN108092420B CN201611039537.4A CN201611039537A CN108092420B CN 108092420 B CN108092420 B CN 108092420B CN 201611039537 A CN201611039537 A CN 201611039537A CN 108092420 B CN108092420 B CN 108092420B
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Abstract
The invention discloses a control method of an electric energy receiving end and a wireless electric energy transmission device.
Description
Technical Field
The present invention relates to the field of wireless technologies, and in particular, to a control method for an electric energy receiving end and a wireless electric energy transmission apparatus.
Background
The magnetic resonance type wireless power transmission device comprises a power transmitting end and a power receiving end, as shown in fig. 1, the power transmitting end comprises a DC-DC converter, a DC-AC inverter, a primary resonant capacitor Cs, a primary transmitting coil Ls and an MCU controller 1; the electric energy receiving end comprises a rectifying circuit, a DC-DC converter, a secondary resonant capacitor Cd, a secondary receiving coil Ld and an MCU controller 2, wherein the MCU controller 1 and the MCU controller 2 are in communication connection through a wireless communication protocol such as a BLE Bluetooth protocol. The electric energy transmitting end converts the electric energy at the input end into a space magnetic field to be transmitted to the electric energy receiving end.
When no receiving end device is arranged around the electric energy transmitting end, the MCU controller 1 controls the electric energy transmitting end to enter a standby mode, so that the loss can be reduced, and the standby efficiency is improved; when the MCU controller 1 of the power transmitting terminal detects that there is a power receiving terminal in the active charging region, the power transmitting terminal needs to be activated immediately, and the MCU controller 2 controls the DC-DC converter in the receiving terminal to output a voltage Vout and a current Iout to power the electronic device. Fig. 2 shows an equivalent circuit of the power receiving terminal, wherein a voltage Vs represents an induced voltage of a coil of the power receiving terminal, a larger induced voltage Vs represents a stronger magnetic field in this region, Rin represents equivalent impedances of the coil, a magnetic shield and a rectifier diode, and Req represents an equivalent impedance of an output load. According to the equivalent circuit shown in fig. 2, the output power Pout of the electric energy receiving end is:
fig. 3 shows a relationship between the output power Pout and the load equivalent resistance Req, and the equivalent resistance Rin in fig. 3, which represents the loss of the power receiving terminal itself, is 2 Ω as an example. When the electric energy receiving terminal is placed in the effective charging area of the electric energy transmitting terminal and the coupling position is good, the induced voltage is high, for example, Vs is 10V, as shown in fig. 3, a working waveform diagram of the output power and the load equivalent resistance in fig. 2 is shown, taking the output power 5W as an example, the load equivalent resistance Req is about 16.5 Ω, and according to a resistance value ratio of the equivalent resistances Rin and Req, the electric energy loss on the equivalent resistance Rin is about 0.6W, that is, the power loss of the electric energy receiving terminal is about 0.6W. However, when the power receiving end is placed at a position with poor coupling in the effective charging region, the induced voltage is reduced, for example, Vs is 6.5V, as shown in fig. 3, if the output power is 5W at this time, the load equivalent resistance Req is about 3 Ω, and according to the resistance ratio of the equivalent resistances Rin and Req, the power loss on the resistance Rin is about 3.3W, obviously, the efficiency of the wireless power transmission device is greatly reduced at this time, and meanwhile, the power receiving end also has a problem of serious heat generation.
Disclosure of Invention
In view of this, the present invention provides a control method for an electric energy receiving terminal and a wireless electric energy transmission device, which actively reduce the output power of an output terminal under the condition of the reduction of the induced voltage, thereby reducing the power loss of the electric energy receiving terminal and improving the working efficiency.
The invention relates to a control method of an electric energy receiving end, which comprises the following steps:
detecting the induced voltage of the electric energy receiving end, and comparing the induced voltage with a preset threshold voltage;
calculating the output end power of the electric energy receiving end, and comparing the output end power with a preset power threshold value;
and when the induced voltage is smaller than a preset threshold voltage and the power of the output end is larger than the preset power threshold, reducing the output power of the electric energy receiving end.
Preferably, the specific steps of detecting the induced voltage of the power receiving terminal and comparing the induced voltage with a first threshold voltage include:
sampling a direct current voltage signal at the output end of a rectifying circuit in the electric energy receiving end, and comparing the direct current voltage signal with a first threshold voltage;
and when the direct current voltage signal is smaller than the first threshold voltage, the induced voltage is represented to be smaller than a preset threshold voltage.
Preferably, the output power of the power receiving terminal is reduced by reducing the output voltage of the power receiving terminal.
Preferably, the output terminal power is obtained by detecting an output voltage and an output current of the power receiving terminal.
The wireless electric energy transmission device comprises an electric energy transmitting end and an electric energy receiving end, wherein the electric energy transmitting end receives input electric energy to convert the input electric energy into a space magnetic field for the electric energy receiving end to use;
the electric energy receiving end is coupled with the space magnetic field, and outputs voltage to supply to a load after being processed by the rectifying circuit and the voltage conversion circuit;
wherein the electric energy receiving end comprises an output power detection circuit, an induced voltage detection circuit and an output power regulation circuit,
the induced voltage detection circuit detects the induced voltage of the electric energy receiving end and compares the induced voltage with a preset threshold voltage;
the output power detection circuit calculates the output end power of the electric energy receiving end and compares the output end power with a preset power threshold value;
the output power regulating circuit receives the comparison result of the induced voltage detection circuit and the comparison result of the output power detection circuit, and when the induced voltage is smaller than a preset threshold voltage and the output end power is larger than the preset power threshold, the output power of the electric energy receiving end is reduced.
Preferably, the induced voltage detection circuit samples a dc voltage signal at an output terminal of the rectification circuit and compares the dc voltage signal with a first threshold voltage;
and when the direct current voltage signal is smaller than the first threshold voltage, indicating that the induced voltage of the electric energy receiving end is smaller than the preset threshold voltage.
Preferably, the output power regulating circuit reduces the output power of the power receiving terminal by reducing the output voltage of the power receiving terminal.
Preferably, the output power detection circuit obtains the output power by detecting an output voltage and an output current of the power receiving terminal.
Preferably, the electric energy receiving end comprises an electric energy receiving coil, and the rectifying circuit and the voltage converter are sequentially connected behind the electric energy receiving coil;
the output power regulating circuit controls the output voltage of the electric energy receiving end by controlling the output voltage of the voltage converter.
In summary, according to the control method of the power receiving terminal and the wireless power transmission device of the invention, by detecting the induced voltage of the power receiving terminal, when the induced voltage is detected to be lower and the output power is detected to be higher, the output power of the output terminal of the power receiving terminal is actively reduced, so that the power loss of the power receiving terminal is reduced, and the working efficiency is improved.
Drawings
Fig. 1 is a circuit diagram of a wireless power transmission apparatus according to the prior art;
fig. 2 is an equivalent circuit diagram of the power receiving terminal in fig. 1;
FIG. 3 is a waveform diagram illustrating the output power and the equivalent resistance of the load shown in FIG. 2;
FIG. 4 is a circuit diagram of a power receiving terminal according to the present invention;
FIG. 5 is a graph showing the operating waveforms of the output power and the load equivalent resistance according to the present invention;
fig. 6 is a flowchart of a control method of a power receiving terminal according to the present invention.
Detailed Description
Some preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited thereto.
Referring to fig. 4, a circuit diagram of an electric energy receiving terminal according to the present invention is shown, the electric energy receiving terminal of the present invention is used in a wireless electric energy transmission device, the wireless electric energy transmission device includes an electric energy transmitting terminal and an electric energy receiving terminal, the electric energy transmitting terminal receives input electric energy to convert the input electric energy into a spatial magnetic field for the electric energy receiving terminal to use; the electric energy receiving end is coupled with the space magnetic field, and outputs voltage to supply to a load after being processed by the rectifying circuit and the voltage conversion circuit; the circuit structure of the power transmitting terminal is the same as that in fig. 1, and is not described herein again. Here, the power receiving terminal includes a power receiving coil, a rectifying circuit, and a voltage converting circuit (here, a DC-DC voltage converting circuit, which is denoted as a DC-DC converter in fig. 4), and the rectifying circuit and the voltage converter are connected in sequence after the power receiving coil.
The electric energy receiving end further comprises an MCU controller 2, and the MCU controller 2 comprises an output power detection circuit 41, an induced voltage detection circuit 42 and an output power regulation circuit 43.
The induced voltage detection circuit 42 detects an induced voltage of the power receiving terminal and compares the induced voltage with a preset threshold voltage, in this embodiment, the induced voltage detection circuit 42 samples a dc voltage signal Vrect at an output end of the rectifier circuit and compares the dc voltage signal with a first threshold voltage Vth; when the direct-current voltage signal Vrect is smaller than the first threshold voltage Vth, it represents that the induced voltage of the electric energy receiving end is smaller than the preset threshold voltage.
The output power detection circuit 41 calculates the output end power of the electric energy receiving end, and compares the output end power Pout with a preset power threshold Pth; in this embodiment, the output power Pout detection circuit obtains the output power by detecting the output voltage and the output current of the power receiving terminal.
The output power adjusting circuit 43 receives the comparison result of the induced voltage detecting circuit and the comparison result of the output power detecting circuit, and when the induced voltage is smaller than a preset threshold voltage and the output power is larger than the preset power threshold, the output power of the electric energy receiving terminal is reduced, otherwise, when the induced voltage is larger than the preset threshold voltage or the output power is smaller than the preset power threshold, the output power of the electric energy receiving terminal is maintained unchanged. In this embodiment, the output power of the electric energy receiving terminal is reduced by reducing the output voltage Vo of the electric energy receiving terminal by the output power adjusting circuit. Further, in the present embodiment, the output power adjusting circuit 43 controls the output voltage of the power receiving terminal by controlling the output voltage of the DC-DC converter.
The operation of the present invention is explained below with reference to the circuit diagram of fig. 4 and the waveform diagram shown in fig. 5: from the circuit of fig. 4, the calculation formula of the dc voltage signal Vrect is:
in the formula (1), Ploss is the loss on the equivalent resistor Rin in the circuit, and when the induced voltage Vs decreases, if the output power is maintained to be constant, the power loss Ploss on Rin according to the description in the background art increases, the dc voltage signal Vrect decreases, and therefore, the strength of the induced voltage Vs can be represented by the dc voltage signal Vrect at the output end of the rectifying circuit. It can also be seen from the formula (1) that when the induced voltage Vs decreases, if the output power is decreased, the loss Ploss of the equivalent resistance Rin correspondingly decreases, and the dc voltage signal Vrect increases.
When the electric energy receiving end is placed in the effective charging area of the electric energy transmitting end, but the coupling position is poor, as shown in fig. 5, if the induced voltage Vs of the electric energy receiving end is 6.5V, and the output power is 5W at this time, the load equivalent resistance Req is about 3 Ω, the equivalent resistance Rin still takes 2 Ω as an example, according to the resistance ratio of the equivalent resistance Rin and the equivalent resistance Req, the loss Ploss on the equivalent resistance Rin is about 3.3W at this time, and the efficiency of the electric energy receiving end is 60%; if the output power is reduced to 3W, the load equivalent resistance Req is equivalent to 10 omega, the loss Ploss on the equivalent resistance Rin is reduced to about 0.6W according to the resistance ratio of the equivalent resistance Rin to the equivalent resistance Req, and the efficiency of the electric energy receiving end is improved to 83%.
Therefore, when the coupling condition of the electric energy receiving end is poor, the working efficiency of the electric energy receiving end can be obviously improved by actively reducing the power of the output end of the electric energy receiving end.
The invention also discloses a control method of the electric energy receiving end, the flow chart of which is shown in figure 6, and the method comprises the following steps:
detecting the induced voltage of the electric energy receiving end, and comparing the induced voltage with a preset threshold voltage;
calculating the output end power of the electric energy receiving end, and comparing the output end power with a preset power threshold value;
and when the induced voltage is smaller than a preset threshold voltage and the power of the output end is larger than the preset power threshold, reducing the output power of the electric energy receiving end.
Specifically, the specific steps of detecting the induced voltage of the power receiving terminal and comparing the induced voltage with a first threshold voltage include:
sampling a direct current voltage signal at the output end of a rectifying circuit in the electric energy receiving end, and comparing the direct current voltage signal with a first threshold voltage;
and when the direct current voltage signal is smaller than the first threshold voltage, the induced voltage is represented to be smaller than a preset threshold voltage.
Preferably, the output power of the power receiving terminal is reduced by reducing the output voltage of the power receiving terminal.
Preferably, the output terminal power is obtained by detecting an output voltage and an output current of the power receiving terminal.
Although the control method of the power receiving end and the wireless power transmission device according to the preferred embodiment of the present invention have been described in detail, the circuits and advantages of the patent should not be considered as being limited to the above description, and the disclosed embodiment and the accompanying drawings can better understand the present invention.
Claims (9)
1. A control method for an electric energy receiving end is characterized by comprising the following steps:
detecting the induced voltage of the electric energy receiving end, and comparing the induced voltage with a preset threshold voltage;
calculating the output end power of the electric energy receiving end, and comparing the output end power with a preset power threshold value;
and when the induced voltage is smaller than a preset threshold voltage and the power of the output end is larger than the preset power threshold, reducing the output power of the electric energy receiving end.
2. The control method according to claim 1, wherein the specific steps of detecting the induced voltage of the power receiving terminal and comparing the induced voltage with a preset threshold voltage comprise:
sampling a direct current voltage signal at the output end of a rectifying circuit in the electric energy receiving end, and comparing the direct current voltage signal with a first threshold voltage;
and when the direct current voltage signal is smaller than the first threshold voltage, the induced voltage is represented to be smaller than a preset threshold voltage.
3. The control method according to claim 1, wherein the output power of the power receiving terminal is reduced by reducing the output voltage of the power receiving terminal.
4. The control method according to claim 1, wherein the output terminal power is obtained by detecting an output voltage and an output current of the power receiving terminal.
5. A wireless electric energy transmission device comprises an electric energy transmitting end and an electric energy receiving end, and is characterized in that the electric energy transmitting end receives input electric energy to convert the input electric energy into a space magnetic field for the electric energy receiving end to use;
the electric energy receiving end is coupled with the space magnetic field, and outputs voltage to supply to a load after being processed by the rectifying circuit and the voltage conversion circuit;
wherein the electric energy receiving end comprises an output power detection circuit, an induced voltage detection circuit and an output power regulation circuit,
the induced voltage detection circuit detects the induced voltage of the electric energy receiving end and compares the induced voltage with a preset threshold voltage;
the output power detection circuit calculates the output end power of the electric energy receiving end and compares the output end power with a preset power threshold value;
the output power regulating circuit receives the comparison result of the induced voltage detection circuit and the comparison result of the output power detection circuit, and when the induced voltage is smaller than a preset threshold voltage and the output end power is larger than the preset power threshold, the output power of the electric energy receiving end is reduced.
6. The wireless power transmission apparatus according to claim 5, wherein the induced voltage detection circuit samples a dc voltage signal at an output terminal of the rectification circuit and compares the dc voltage signal with a first threshold voltage;
and when the direct current voltage signal is smaller than the first threshold voltage, indicating that the induced voltage of the electric energy receiving end is smaller than the preset threshold voltage.
7. The wireless power transmission apparatus according to claim 5, wherein the output power adjusting circuit decreases the output power of the power receiving terminal by decreasing the output voltage of the power receiving terminal.
8. The wireless power transmission apparatus according to claim 5, wherein the output power detection circuit obtains the output power by detecting an output voltage and an output current of the power receiving terminal.
9. The wireless power transmission apparatus according to claim 7, wherein the power receiving terminal includes a power receiving coil, and the rectifying circuit and the voltage converter are connected in sequence after the power receiving coil;
the output power regulating circuit controls the output voltage of the electric energy receiving end by controlling the output voltage of the voltage converter.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611039537.4A CN108092420B (en) | 2016-11-21 | 2016-11-21 | Control method of electric energy receiving end and wireless electric energy transmission device |
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| CN201611039537.4A CN108092420B (en) | 2016-11-21 | 2016-11-21 | Control method of electric energy receiving end and wireless electric energy transmission device |
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Citations (5)
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| CN101789638A (en) * | 2010-02-26 | 2010-07-28 | 深圳和而泰智能控制股份有限公司 | Wireless charging receiver capable of extending charging distance and method |
| CN102742138A (en) * | 2009-12-04 | 2012-10-17 | 无线联电科技有限公司 | AC-DC converter and AC-DC conversion method |
| CN103312043A (en) * | 2012-03-06 | 2013-09-18 | 株式会社东芝 | Wireless electric power transmission device |
| CN104821667A (en) * | 2015-03-16 | 2015-08-05 | 中国计量学院 | Magnetic coupling resonant wireless electric energy transmission device based on low frequency PWM rectifier |
| CN105637771A (en) * | 2013-10-17 | 2016-06-01 | 捷通国际有限公司 | Wireless power communication |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9686024B2 (en) * | 2015-04-27 | 2017-06-20 | Avago Technologies General Ip (Singapore) Pte. Ltd. | True radio frequency (RF) power detector |
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- 2016-11-21 CN CN201611039537.4A patent/CN108092420B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102742138A (en) * | 2009-12-04 | 2012-10-17 | 无线联电科技有限公司 | AC-DC converter and AC-DC conversion method |
| CN101789638A (en) * | 2010-02-26 | 2010-07-28 | 深圳和而泰智能控制股份有限公司 | Wireless charging receiver capable of extending charging distance and method |
| CN103312043A (en) * | 2012-03-06 | 2013-09-18 | 株式会社东芝 | Wireless electric power transmission device |
| CN105637771A (en) * | 2013-10-17 | 2016-06-01 | 捷通国际有限公司 | Wireless power communication |
| CN104821667A (en) * | 2015-03-16 | 2015-08-05 | 中国计量学院 | Magnetic coupling resonant wireless electric energy transmission device based on low frequency PWM rectifier |
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