CN111983306A - Wireless energy transmission frequency tracking detection circuit and implementation method - Google Patents
Wireless energy transmission frequency tracking detection circuit and implementation method Download PDFInfo
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- CN111983306A CN111983306A CN202010846372.1A CN202010846372A CN111983306A CN 111983306 A CN111983306 A CN 111983306A CN 202010846372 A CN202010846372 A CN 202010846372A CN 111983306 A CN111983306 A CN 111983306A
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Abstract
The invention discloses a wireless energy transfer frequency tracking detection circuit and an implementation method thereof, wherein the wireless energy transfer frequency tracking detection circuit comprises a resonance voltage detection principle and a detection method of a primary side transmitting coil, and the tracking circuit further comprises: the transmitting end resonant circuit utilizes the amplitude-frequency characteristic and the phase-frequency characteristic of the inductance of a transmitting coil of the resonant circuit, a square wave voltage source is injected into the resonant converter, an RLC circuit inside the converter generates resonance, and high voltage is generated on the inductance (the transmitting coil); the amplifying circuit amplifies the inductance voltage in the resonant circuit after high-impedance conversion sampling, completes full-wave rectification to change the full-wave rectification into a direct-current voltage signal and outputs a voltage signal which can be identified or used by the controller; and the frequency controller is used for tracking the frequency and controlling the frequency of the converter according to the acquired voltage of the inductance coil so as to adjust the output power of the energy transfer circuit. The invention adjusts the working frequency of the transmitting end converter by tracking the voltage change of the transmitting coil, so that the voltage of the transmitting coil reaches the maximum value, and finally the control of the resonant frequency in the circuit is realized.
Description
Technical Field
The invention relates to the technical field of magnetic coupling resonance wireless power transmission, in particular to a wireless energy transmission frequency tracking detection circuit and an implementation method.
Background
With the rapid development of electronic technology, the application of wireless energy transmission technology is more and more extensive, and in order to more clearly understand the deficiency of the prior art, a detailed description can be made with reference to fig. 1. Wherein Lp and Ls respectively represent transmitting and receiving coils for wireless energy transmission, and letter M represents the coupling coefficient related to the distance between the coils. The load equivalent resistance at the receiving end is denoted by the letter RL. In order to increase the transmission distance of wireless energy transmission, it is usually necessary to ensure that the transmitting end is in a resonance state, because in the resonance state, the RLC circuit can generate a very high voltage ulp. And when the receiving end Ls is in the resonant state, the receiving end Ls can sense higher voltage or current, and the existing frequency tracking control technology mainly detects whether the transmitting end is in the resonant state. During the energy transfer, the resonance parameters of the transmitting end are changed due to the change of the load RL or the distance M. The voltage at the transmitting coil LP is reduced due to the change in the parameters of the resonator which affects the converter from the outside, thereby affecting the energy transfer efficiency.
For the above technical problem, in order to improve the energy transfer efficiency, the conventional technique is:
the first scheme is as follows: in order to detect whether the transmission system is in a resonant state, it is generally required to detect a voltage and current phase difference of the transmitting end, and the resonant frequency is adjusted by locking the phase difference.
The method detects the current and voltage phase difference of a sending loop, and the resonant frequency is adjusted by a controller to ensure that the voltage and current phase difference of a sending end is 0 degree. This method requires the acquisition of the primary voltage, and the current phase. And phase comparison is also performed to calculate the phase difference. The problem of phase compensation of the collected current exists, the cost of phase collection hardware is increased, even at a resonant frequency working point, the voltage on the coil is not the maximum value, and the generated magnetic field intensity is not the strongest. .
Scheme II: and detecting the voltage of the receiving end and controlling the resonant frequency.
The operating frequency of the converter is adjusted by detecting the voltage at the receiving end, and this scheme still has some problems, such as an additional feedback information channel needs to be established between the wireless energy transmission receiving end and the transmitting end in order to adjust the resonant frequency of the transmitting end. If the signals at the transmitting and receiving ends are transmitted by wire, the meaning of wireless transmission is lost, and if the signals are connected by wireless, the complexity of system control and the hardware cost are increased.
The third scheme is as follows: and detecting the short-circuit current value of the transmitting loop, and controlling the resonant frequency by using a zero-voltage phase detection method.
In this scheme, the resonant frequency is controlled by actively detecting the zero phase point for the short circuit of the converter. The problem with this is that two current phases need to be acquired for calculation. The hardware cost is high and is not applicable. Can only be used for low-power wireless energy transfer equipment. The use of this method may lead to damage of the power device in high power use.
In summary, the conventional frequency control technology mainly ensures that the transmitting end is in a resonant state, so that high voltage and large current are generated in the primary coil. In order to detect the resonance state, the phases of the current and the voltage of the transmitting terminal are mainly detected. The technology is a control measure adopted for ensuring resonance, a large amount of data signals need to be collected, and the market competitiveness of products is reduced due to the increase of the number of sensors.
Disclosure of Invention
Aiming at the technical defects, the invention discloses a wireless energy transmission frequency tracking detection circuit and an implementation method thereof, which can improve the transmission efficiency and distance by changing the frequency of a wireless energy transmission sending end, and comprises three parts, namely a detection method, a detection principle and a working frequency control method, so that the frequency control precision is greatly improved, the number of sensors is reduced, and the cost of a product is reduced.
In order to solve the problems in the prior art, the invention adopts the following technical scheme:
a wireless energy transfer frequency tracking detection circuit, comprising coil voltage acquisition and amplification, wherein the tracking circuit further comprises:
the resonance circuit utilizes the amplitude-frequency characteristic and the phase-frequency characteristic of the inductance of the resonance circuit transmitting coil, the square wave voltage source is injected into the resonance converter, the RLC circuit inside the converter generates resonance, high voltage is generated on the inductance (transmitting coil), and the transmitting coil and the receiving coil generate magnetic resonance coupling;
the amplifying circuit comprises an inductive voltage divider resistor and amplifies the positive and negative signals;
the frequency controller is used for adjusting the working frequency of the resonator by tracking the maximum value point of the voltage of the transmitting coil; wherein:
the resonant circuit, the amplifying circuit and the frequency controller are all arranged on the primary side, voltage on the secondary side does not need to be additionally detected, the input end of the transmitting coil amplifying circuit on the primary side is connected, the amplifying circuit is connected with the frequency controller, and the output end of the resonant circuit is in weak coupling connection with the input end on the secondary side.
As a further technical scheme of the invention, the voltage value of the transmitting coil is collected, the normal work of the resonant circuit is not influenced after impedance conversion, and the voltage of the coil can be collected. As a further technical solution of the present invention, the resonant tank circuit includes a coupling coil, and the coupling coil includes a primary coil LPAnd a secondary coil LSThe primary coil LPIs connected with a first capacitor CpThe secondary coil LSIs connected with a second capacitor CS。
As a further technical solution of the present invention, the reference point of the frequency tracking method is that a voltage value on the transmitting inductance coil is shown in fig. 3, and the controller retrieves the operating frequency generating the maximum value, i.e. the UL highest voltage point, by an algorithm.
As a further technical solution of the present invention, the secondary side is a diode circuit, and the diode circuit includes a first diode D1A second diode D2A third diode D3A fourth diode D4A third capacitor CfAnd a third resistor RLWherein the first diode D1And a third diode D3Connected in series, the second diode D2And a fourth diode D4Connected in series, the first diode D1And a third diode D3Respectively connected with the second diode D2And a fourth diode D4And a third capacitor CfAnd a third resistor RLAre connected in parallel.
In order to solve the technical problems, the invention also adopts the following technical scheme:
a wireless energy transfer frequency tracking detection method comprises a frequency detection method and a frequency tracking control method.
As a further technical solution of the present invention, the frequency detection method monitors whether the transmitting end of the energy transmission system operates at an optimal frequency by collecting the voltage on the transmitting coil in the resonant loop of the transmitting end, and then realizes the control of the maximum power output by the frequency controller.
As a further technical solution of the present invention, the frequency tracking control method controls the operating frequency of the transmitting circuit after the frequency controller detects a change in the peak-to-peak value of the transmitting coil so that the voltage on the transmitting coil is the highest and the current is the largest, and when the coupling coefficient is changed or the load is changed, the controller can track the change in the voltage of the transmitting coil to adjust the operating frequency of the transmitting-end converter, and adjust the operating frequency so that the voltage of the transmitting coil reaches the maximum value again.
Has the positive and beneficial effects that:
the invention realizes the detection and control of the resonant frequency in the circuit and overcomes the defects in the prior art by constructing the wireless energy transfer frequency tracking detection circuit with a primary side, a secondary side, a resonant circuit, a coil voltage detection sampling and voltage small signal amplifier and a frequency controller.
The invention amplifies the weak small signal in the circuit by arranging the amplifying circuit in the circuit and outputs a larger signal which can be identified or used by a user.
The frequency controller is arranged in the circuit, and the frequency in the circuit is controlled according to the requirement of a user so as to adjust the frequency change in the circuit and meet the requirement of the circuit operation.
The invention adjusts the working frequency of the transmitting end converter by tracking the voltage of the transmitting coil, so that the voltage of the transmitting coil reaches the maximum value, and finally the control of the frequency in the circuit is realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive exercise, wherein:
FIG. 1 is a schematic diagram of a wireless energy transmission frequency tracking detection model in the prior art;
FIG. 2 is a schematic diagram of a wireless energy transmission frequency tracking detection circuit according to the present invention;
fig. 3 is a schematic diagram of a maximum voltage point on an RLC device of a series resonant circuit in an embodiment of a wireless energy transmission frequency tracking detection method according to the present invention;
fig. 4 is a schematic diagram of a relationship between a voltage on a coil and a load resistance and a coupling coefficient in a wireless energy transfer frequency tracking detection method according to the present invention.
Detailed Description
The preferred embodiments of the present invention will be described below with reference to the accompanying drawings, and it should be understood that the embodiments described herein are merely for the purpose of illustrating and explaining the present invention and are not intended to limit the present invention.
As shown in fig. 1, wherein fig. 1 is a prior art scheme, wherein Lp and Ls respectively represent transmitting and receiving coils for wireless energy transmission, and M represents a coupling coefficient related to a distance between the coils. The load equivalent resistance at the receiving end is denoted by the letter RL. In order to increase the transmission distance of wireless energy transmission, it is usually necessary to ensure that the transmitting end is in a resonance state, because in the resonance state, the RLC circuit can generate a very high voltage ulp. And when the receiving end Ls is in the resonant state, the receiving end Ls can sense higher voltage or current, and the existing frequency tracking control technology mainly detects whether the transmitting end is in the resonant state. During the energy transfer, the resonance parameters of the transmitting end are changed due to the change of the load RL or the distance M. The voltage at the transmitting coil LP is reduced due to the change in the parameters of the resonator which affects the converter from the outside, thereby affecting the energy transfer efficiency.
Aiming at the defects of the prior art, the research provides a wireless energy transmission frequency tracking detection circuit and an implementation method. The following provides a detailed description of examples thereof.
Example 1 Circuit
As shown in fig. 2. A wireless energy transfer frequency tracking detection circuit comprising a primary side and a secondary side, wherein the tracking circuit further comprises:
a wireless energy transfer frequency tracking detection circuit, comprising coil voltage acquisition and amplification, wherein the tracking circuit further comprises:
the resonance circuit utilizes the amplitude-frequency characteristic and the phase-frequency characteristic of the inductance of the resonance circuit transmitting coil, the square wave voltage source is injected into the resonance converter, the RLC circuit inside the converter generates resonance, high voltage is generated on the inductance (transmitting coil), and the transmitting coil and the receiving coil generate magnetic resonance coupling;
the amplifying circuit comprises an inductive voltage divider resistor and amplifies the positive and negative signals;
the frequency controller is used for adjusting the working frequency of the resonator by tracking the maximum value point of the voltage of the transmitting coil; wherein:
the resonant circuit, the amplifying circuit and the frequency controller are all arranged on the primary side, voltage on the secondary side does not need to be additionally detected, the input end of the transmitting coil amplifying circuit on the primary side is connected, the amplifying circuit is connected with the frequency controller, and the output end of the resonant circuit is in weak coupling connection with the input end on the secondary side.
In the above embodiment, the voltage value of the transmitting coil is collected, and after impedance conversion, the normal operation of the resonant circuit is not affected, but the voltage of the coil can be collected.
In the above embodiment, the resonant tank circuit includes a coupling coil including the primary coil LPAnd a secondary coil LSThe primary coil LPIs connected with a first capacitor CpThe secondary coil LSIs connected with a second capacitor CS。
In the above embodiment, the reference point of the frequency tracking method is a voltage value on the transmitting inductor as shown in fig. 3, and the controller retrieves the operating frequency that produces the maximum value, i.e., the UL highest voltage point, by an algorithm.
In the above embodiment, the secondary side is a diode circuit including a first diode D1A second diode D2A third diode D3A fourth diode D4A third capacitor CfAnd a third resistor RLWherein the first diode D1And a third diode D3Connected in series, the second diode D2And a fourth diode D4Connected in series, the first diode D1And a third diode D3Respectively connected with the second diode D2And a fourth diode D4And a third capacitor CfAnd a third resistor RLAre connected in parallel.
EXAMPLE 2 method
As shown in fig. 3-4, a method for detecting frequency tracking of wireless energy transmission includes a frequency detection method and a frequency tracking control method.
The frequency detection method comprises the steps of monitoring whether the transmitting end of the energy transmission system works at the optimal frequency or not by collecting the voltage on the transmitting coil in the resonant loop of the transmitting end, and then realizing the control of the maximum power output through the frequency controller.
The frequency tracking control method comprises the steps that after the frequency controller detects the change of the peak-to-peak value of the transmitting coil, the working frequency of the transmitting circuit is controlled to enable the voltage on the transmitting coil to be the highest and the current to be the largest, when the coupling coefficient is changed or the load is changed, the controller can track the change of the voltage of the transmitting coil to adjust the working frequency of the transmitting end converter, and the working frequency is adjusted to enable the voltage of the transmitting coil to reach the maximum value again.
In the practical implementation of the present invention, the primary side and the secondary side can also be understood as a transmitting end group and a receiving end group, in the actual operation process, the energy transfer system may cause a change in the resonant parameter of the transmitting end due to a change in the load RL or the distance M, and the energy transfer efficiency may be affected by a decrease in the voltage on the transmitting coil LP due to a change in the parameter of the resonator caused by the influence of the converter from the outside. The method adjusts the working frequency of the transmitting end converter by tracking the voltage change of the transmitting coil, so that the voltage of the transmitting coil reaches a maximum value, and finally the control of the resonant frequency in the circuit is realized.
As can be seen from the graph of fig. 4, the operating frequency of the transmitting terminal can also be controlled by monitoring the voltage on Cp. In order to increase the Q value of the inductor at the transmitting end, the input internal resistance of the detecting end is increased, and an operational amplifier A1 is adopted to amplify small signals. Due to the change of the reflection impedance, the frequency controller controls the working frequency of the transmitting circuit after detecting the change of the peak-to-peak value of the transmitting coil so that the voltage on the transmitting coil is the highest and the current is the largest.
Further, in the above-described embodiments, in the resonant tank circuit (LRC resonant circuit), wherein the resonant frequency
When the LRC system works, the voltage on the inductor in the resonant circuit does not reach the maximum value, and when the inductor L and the capacitor C reach the maximum value, the LRC system works at two different frequencies, and the frequency value is near the resonant frequency, as can be known from fig. 3, when the LRC system resonates, the voltage on the resistor at the resonant frequency point can reach the maximum value. But the voltages across the capacitor and inductor are not the same as the resonant frequency when they reach their maximum.
Fig. 4 is a graph of the voltage across the coil versus the load resistance and coupling coefficient. Through the embodiment, the invention can detect whether the energy transfer system works in the highest power output state, more specifically, the invention monitors whether the transmitting end of the energy transfer system works in the optimal frequency by acquiring the voltage on the transmitting coil in the resonant loop of the transmitting end, and then the control of the maximum power output is realized through the frequency controller. The working frequency of the transmitting end converter is adjusted by monitoring the voltage of the compensating capacitor of the transmitting coil. And the control strategy is used for controlling the frequency of the transmitting terminal by detecting the voltage of the transmitting coil (or compensating the voltage of the capacitor).
Although specific embodiments of the present invention have been described above, it will be understood by those skilled in the art that these specific embodiments are merely illustrative and that various omissions, substitutions and changes in the form of the detail of the methods and systems described above may be made by those skilled in the art without departing from the spirit and scope of the invention. For example, it is within the scope of the present invention to combine the steps of the above-described methods to perform substantially the same function in substantially the same way to achieve substantially the same result. Accordingly, the scope of the invention is to be limited only by the following claims.
Claims (8)
1. The utility model provides a wireless biography can frequency tracking detection circuitry, includes that coil voltage gathers and enlargies its characterized in that: the tracking circuit further comprises:
the resonance circuit utilizes the amplitude-frequency characteristic and the phase-frequency characteristic of the inductance of the resonance circuit transmitting coil, the square wave voltage source is injected into the resonance converter, the RLC circuit inside the converter generates resonance, high voltage is generated on the inductance (transmitting coil), and the transmitting coil and the receiving coil generate magnetic resonance coupling;
and the amplifying circuit comprises an inductive voltage divider resistor and positive and negative signal amplification.
The frequency controller is used for adjusting the working frequency of the resonator by tracking the maximum value point of the voltage of the transmitting coil; wherein:
the resonant circuit, the amplifying circuit and the frequency controller are all arranged on the primary side, voltage on the secondary side does not need to be additionally detected, the input end of the transmitting coil amplifying circuit on the primary side is connected, the amplifying circuit is connected with the frequency controller, and the output end of the resonant circuit is in weak coupling connection with the input end on the secondary side.
2. The wireless energy transfer frequency tracking detection circuit of claim 1, wherein: the voltage value of the transmitting coil is collected, and the normal work of the resonant circuit is not influenced after impedance conversion, but the voltage of the coil can be collected.
3. A radio as claimed in claim 1Pass energy frequency tracking detection circuit, its characterized in that: the resonant tank circuit comprises a coupling coil including a primary coil LPAnd a secondary coil LSThe primary coil LPIs connected with a first capacitor CpThe secondary coil LSIs connected with a second capacitor CS。
4. The wireless energy transfer frequency tracking detection circuit of claim 1, wherein:
the reference point for the frequency tracking method is that a voltage value on the transmitting inductor is shown in fig. 3, and the controller algorithmically retrieves the operating frequency that produces the maximum value, i.e., the UL maximum voltage point.
5. The wireless energy transfer frequency tracking detection circuit of claim 1, wherein: the secondary side is a diode circuit including a first diode D1A second diode D2A third diode D3A fourth diode D4A third capacitor CfAnd a third resistor RLWherein the first diode D1And a third diode D3Connected in series, the second diode D2And a fourth diode D4Connected in series, the first diode D1And a third diode D3Respectively connected with the second diode D2And a fourth diode D4And a third capacitor CfAnd a third resistor RLAre connected in parallel.
6. A method for implementing wireless energy transfer frequency tracking detection by using the wireless energy transfer frequency tracking detection circuit of any one of claims 1 to 5, characterized in that: the method comprises a frequency detection method and a frequency tracking control method.
7. The wireless energy transfer frequency tracking detection circuit according to claim 6, wherein: the frequency detection method comprises the steps of monitoring whether the transmitting end of the energy transmission system works at the optimal frequency or not by collecting the voltage on the transmitting coil in the resonant loop of the transmitting end, and then realizing the control of the maximum power output through the frequency controller.
8. The wireless energy transfer frequency tracking detection circuit according to claim 6, wherein: the frequency tracking control method is characterized in that the working frequency of the transmitting circuit is controlled after the frequency controller detects the change of the peak-to-peak value of the transmitting coil, so that the voltage on the transmitting coil is the highest, the current is the largest, when the coupling coefficient is changed or the load is changed, the controller can track the change of the voltage of the transmitting coil to adjust the working frequency of the transmitting end converter, and the working frequency is adjusted so that the voltage of the transmitting coil reaches the maximum value again.
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Cited By (1)
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| CN112910109A (en) * | 2021-01-20 | 2021-06-04 | 宁波方太厨具有限公司 | Working method of passive sensing system and system applying method |
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