CN109391045B - Distance-frequency self-adaptive magnetic resonance energy transmitter - Google Patents
Distance-frequency self-adaptive magnetic resonance energy transmitter Download PDFInfo
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- CN109391045B CN109391045B CN201811501220.7A CN201811501220A CN109391045B CN 109391045 B CN109391045 B CN 109391045B CN 201811501220 A CN201811501220 A CN 201811501220A CN 109391045 B CN109391045 B CN 109391045B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
- H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
Abstract
The invention discloses a distance-frequency self-adaptive magnetic resonance energy transmitter, which comprises a magnetic resonance energy transmitting device and a magnetic resonance energy receiving device. The magnetic resonance energy transmitting device comprises a Class-E power amplifying circuit, a transmitting coil, a first capacitor series network and a first capacitor parallel network consisting of a variable capacitance diode, a first voltage division circuit, a first rectifying circuit, a first filter circuit and a first choke coil. The magnetic resonance energy receiving device is composed of a receiving coil, a second capacitor series network, a second capacitor parallel network formed by variable capacitance diodes, a second rectifying circuit, a second filtering circuit, a second voltage division circuit and a second choke coil. When the distance between the energy receiving and transmitting coils is changed, the resonant frequency can be dynamically adjusted to the natural resonant frequency, namely, the distance-frequency self-adaption is realized; when the distance between the energy receiving and transmitting coils is changed, the frequency splitting effect can be reduced, and the energy transmission efficiency of the system at the natural resonant frequency point is not greatly reduced.
Description
Technical Field
The technology relates to a wireless energy transmission technology, in particular to a distance-frequency self-adaptive magnetic resonance energy transmitter.
Background
The wireless energy transmission system is divided into an electric field coupling wireless energy transmission system, an electromagnetic coupling wireless energy transmission system, a magnetic resonance coupling wireless energy transmission system and a radio wave wireless energy transmission system. The electromagnetic coupling wireless energy transmission system and the magnetic resonance coupling wireless energy transmission system are widely applied, but the traditional magnetic resonance coupling wireless energy transmission system still has the following defects that (1) when the distance between the energy receiving and transmitting coils is changed, the resonance frequency is changed; (2) generally, when the distance between the energy receiving and transmitting coils is within a certain range, the magnetic resonance energy transmission system can obtain the maximum output power and the maximum voltage gain at the natural resonance frequency point, but when the distance is further reduced, the frequency point where the system obtains the maximum output power is generally located at two sides of the natural frequency point, that is, a frequency splitting phenomenon occurs, so that the receiving power of the receiving end is greatly reduced. When frequency splitting occurs, two power peaks appear on two sides of a system natural resonance frequency point, and the two power peaks continuously expand outwards along with the increase of mutual inductance; in addition, as the mutual inductance is changed from small to large, the maximum output power of the system is changed from small to large, then is changed from small to small, and finally tends to be stable. The visible frequency splitting phenomenon makes the output power very sensitive to the distance variation between the coils.
Disclosure of Invention
The invention aims to reduce the frequency splitting phenomenon caused when the distance between transmitting and receiving coils is changed and the problem that the energy transmission efficiency is greatly reduced because the actual working frequency deviates from the natural resonant frequency, and provides a distance-frequency adaptive magnetic resonance energy transmitter.
In order to achieve the purpose, the invention adopts the technical scheme that:
a distance-frequency adaptive magnetic resonance energy transmitter comprises a magnetic resonance energy transmitting device and a magnetic resonance energy receiving device.
The magnetic resonance energy transmitting device comprises a Class-E power amplifying circuit 10, a transmitting coil I11, a capacitor series network I12, a capacitor parallel network I13 formed by a variable capacitance diode, a voltage division circuit I14, a rectifying circuit I15, a filter circuit I16 and a choke coil I17. The Class-E power amplifier circuit comprises a Class-E power amplifier circuit 10, a first transmitting coil 11, a first capacitor series network 12 and a first capacitor parallel network 13 formed by variable capacitance diodes, wherein the first capacitor parallel network 13 is sequentially cascaded; the input end of the voltage division circuit I14 is connected with a connection point between the transmitting coil I11 and the capacitor series network I12, the voltage division circuit I14, the rectifying circuit I15, the filtering circuit I16 and the choke coil I17 are sequentially cascaded, and the output end of the choke coil I17 is connected with the cathode of a varactor diode in a capacitor parallel network I13 formed by the varactor diode.
Furthermore, the Class-E power amplifying circuit (10) is a bias circuit consisting of a high-frequency power tube, two divider resistors and a high-frequency choke coil, and a capacitor connected with the output end of the high-frequency power tube in parallel, so that the high-efficiency amplification of the alternating current signal is completed; the working frequency range of the high-frequency power tube is 1-100 MHz, and the minimum output power is 10W; the resistance ranges of the two divider resistors are 10-200 k omega; the working range of the high-frequency choke coil is 0.1-10 MHz; the capacitance value range of the capacitor connected with the output end of the high-frequency power tube in parallel is 100-4700 pF.
Further, the transmitting coil one 11, the capacitor series network one 12 and the capacitor parallel network one 13 formed by the varactor diode form a resonant network, and resonate at the natural frequency.
Further, the capacitor series network one 12 is formed by connecting at least two capacitors in series, and the capacitance value range of each capacitor is 100-4700 pF.
Further, a capacitance parallel network I13 formed by the varactors is formed by a capacitor and at least two varactors, which are connected in parallel to each other, so as to realize that the total capacitance value is variable within a certain range; the capacitance value range of the capacitor is 100-1000 pF, the variable capacitance value range of the variable capacitance diode is 50-470 pF, and the capacitance value variable range of the total capacitor is 2600-3400 pF.
Further, the first voltage dividing circuit 14 is a voltage dividing network formed by two resistors to reduce the amplitude of the ac signal, and the resistance range of each resistor is 10 to 100k Ω.
Further, the rectifying circuit one 15 is a single rectifying diode or a bridge rectifying circuit, and rectifies the alternating current signal.
The first filter circuit 16 is used for outputting a direct current signal.
The choke coil I17 is used for coupling the direct current signal output by the filter circuit I16 to the cathode of the varactor diode in the capacitance parallel network I13 formed by the varactor diode as a reverse bias voltage of the cathode, and simultaneously blocking the transmission of the alternating current signal to the filter circuit I16.
The signal processing process of the magnetic resonance energy transmitting device comprises the following steps: when the distance between the energy transmitting and receiving coils is reduced, the mutual inductance is increased; meanwhile, the amplitude of the alternating current signal output by the transmitting coil 11 is increased, and the direct current signal extracted by the voltage division circuit I14, the rectification circuit I15 and the filter circuit I16 is increased, so that the reverse bias voltage on the varactor diode in the capacitor parallel network I13 formed by the varactor diode is increased, the capacitance value of the reverse bias voltage is reduced, and the total capacitance value connected with the transmitting coil 11 in series is reduced. Therefore, when the distance between the coils is reduced, the inductance value is increased due to the increase of the mutual inductance M, but the capacitance value forming resonance with the inductance value is reduced, and vice versa, so that the resonance frequency tends to be stable.
The magnetic resonance energy receiving device is composed of a receiving coil 20, a second capacitor series network 21, a second capacitor parallel network 22 formed by variable capacitance diodes, a second rectifying circuit 23, a second filter circuit 24, a second voltage division circuit 25 and a second choke coil 26. Wherein the content of the first and second substances,
the receiving coil 20, the second capacitor series network 21 and the second capacitor parallel network 22 formed by the variable capacitance diodes are sequentially cascaded; the input end of the second rectifying circuit 23 is connected with a connection point between the second receiving coil 20 and the second capacitor series network 21, the second rectifying circuit 23, the second filter circuit 24, the second voltage division circuit 25 and the second choke coil 26 are sequentially connected in cascade, and the output end of the second choke coil 26 is connected with the cathode of a varactor diode in a second capacitor parallel network 22 formed by the varactor diodes.
Further, the receiving coil 20, the second capacitor series network 21, and the second capacitor parallel network 22 formed by the varactor diode form a resonant network, and resonate at a natural frequency.
Further, the second capacitor series network 21 is formed by connecting at least two capacitors in series, and the capacitance value range of each capacitor is 100-4700 pF.
Further, the second capacitance parallel network 22 formed by the varactors consists of a capacitor and at least two varactors, which are connected in parallel to each other, so as to realize that the capacitance value is variable within a certain range; the capacitance value range of the capacitor is 100-1000 pF, the variable capacitance value range of the variable capacitance diode is 50-470 pF, and the capacitance value variable range of the total capacitor is 2600-3400 pF.
Further, the second voltage dividing circuit 25 is a voltage dividing network formed by two resistors to reduce the amplitude of the ac signal; the resistance range of each resistor is 10-100 k omega.
Further, the second rectifying circuit 23 is a single rectifying diode or a bridge rectifying circuit, and rectifies the alternating current signal.
The second filter circuit 24 is used for outputting a direct current signal.
The second choke coil 26 is used for coupling the direct current signal output by the filter circuit 24 to the cathode of the varactor diode in the second capacitance parallel network 22 formed by the varactor diodes as a reverse bias voltage thereof, and simultaneously blocking the transmission of the alternating current signal to the filter circuit 24.
The signal processing process of the magnetic resonance energy receiving device comprises the following steps: when the distance between the energy transmitting and receiving coils is reduced, the mutual inductance is increased; meanwhile, the amplitude of the alternating current signal output by the receiving coil 20 is increased, and the direct current signal extracted by the rectifying circuit II 23, the filtering circuit II 24 and the voltage dividing circuit II 25 is increased, so that the reverse bias voltage on the capacitance diode in the capacitance parallel network II 22 formed by the capacitance diodes is increased, the capacitance value is reduced, and the total capacitance value connected with the receiving coil 20 in series is reduced. Therefore, when the distance between the coils is reduced, the inductance value is increased due to the increase of the mutual inductance M, but the capacitance value forming resonance with the inductance value is reduced, and vice versa, so that the resonance frequency tends to be stable.
The distance-frequency self-adaptive magnetic resonance energy transmission device has the following advantages and beneficial effects:
1) when the distance between the energy receiving and transmitting coils is changed, the resonance frequency can be dynamically adjusted to the natural resonance frequency, namely, the distance-frequency self-adaption is realized;
2) when the distance between the energy receiving and transmitting coils is changed, the frequency splitting effect can be reduced, and the energy transmission efficiency of the system at the natural resonant frequency point is not greatly reduced.
Drawings
Fig. 1 is a block diagram of a distance-frequency adaptive magnetic resonance energy transmitter according to the present invention, in which (a) is a block diagram of a transmitting apparatus, and (b) is a block diagram of a receiving apparatus.
Fig. 2 is a device connection diagram of an embodiment of a distance-frequency adaptive magnetic resonance energy transmitter according to the present invention, wherein (a) is a device connection diagram of a transmitting apparatus, and (b) is a device connection diagram of a receiving apparatus.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1 and 2, a distance-frequency method of the present inventionAdaptive magnetic resonanceAn energy transmitter includes a magnetic resonance energy emitting device and a magnetic resonance energy receiving device. The magnetic resonance energy transmitting device consists of a Class-E power amplifying circuit 10, a transmitting coil 11, a capacitor series network I12, a capacitor parallel network I13 formed by a variable capacitance diode, a voltage division circuit I14, a rectifying circuit I15, a filter circuit I16 and a choke coil I17 (shown in figure 1 (a)). The Class-E power amplifying circuit 10 comprises a voltage division circuit (for providing direct current voltage for a grid electrode of M10), a high-frequency Choke coil RFC10(RF Choke for providing direct current for a drain electrode of M10), an input coupling capacitor C101(10uF, one end is connected with a signal source, and the other end is connected with the grid electrode of M10) and a capacitor C102(3000pF) which is connected with a drain electrode of M10 in parallel, wherein the voltage division circuit is composed of a high-frequency power amplifying tube M1 (such as RD16HHF1), a resistor R101(200 kOmega) and a variable resistor R102(50 kOmega); wherein R10The middle line of 1 and R102 is connected with the grid of M10; one end of the RFC10 is connected with a power supply, and the other end is connected with the drain electrode of the M10; the source of M10 and the other end of C102 are grounded. The transmitting coil 11 is a coil (L11) with the diameter of 30mm and the wire diameter of 1mm, and the inductance value is 10.4 uH. The first capacitor series network 12 is formed by serially connecting capacitors C121(3000pF) and C122(3000 pF). And a capacitance parallel network I13 formed by the varactors IS formed by connecting a capacitor C131(200pF), a varactor Cj132(IS149) and a varactor Cj133(IS149) in parallel. The first voltage division circuit 14 is a voltage division network formed by resistors R141(10k Ω) and R142(30k Ω). The first rectifier circuit 15 is formed by a single rectifier diode D15 (e.g., 1N 5809). The first filter circuit 16 is composed of capacitors C161(10uF) and C162(0.1 uF). The Choke coil one 17 is made of a Choke coil RFC17(RF Choke) (as shown in fig. 2 (a)). And the first transmitting coil 11, the first capacitor series network 12 and the first capacitor parallel network 13 formed by the variable capacitance diode resonate at 2 MHz. The output end (drain electrode) of the Class-E power amplifying circuit 10 is connected with a radiation coil 11; the transmitting coil 11, a first capacitor series network 12 and a first capacitor parallel network 13 formed by the varactors are sequentially cascaded, that is, the parallel networks of L11, C121, C122, C131, Cj132 and Cj133 are sequentially connected in series, and the other ends of C131, Cj132 and Cj133 are all grounded; the input end of the voltage division circuit I14 is connected with a connection point between the transmitting coil 11 and the capacitor series network I12, namely one end of R141 is connected with a connection point of L11 and C121; the first voltage division circuit 14, the first rectifying circuit 15, the first filtering circuit 16 and the first choke coil 17 are sequentially cascaded, namely the middle connection of R141 and R142 is sequentially connected with one end of D15, C161 and C162 which are connected in parallel (the other ends of R142, C161 and C162 are grounded), RFC 17; the output end of the choke coil I17 is connected with the cathode of the varactor diode in the capacitance parallel network I13 formed by the varactor diode, namely the other end of RFC17 is connected with the cathodes of Cj132 and Cj133 (as shown in figure 1 (a)).
As shown in fig. 1(b) and 2(b), the magnetic resonance energy receiving device is composed of a receiving coil 20, a second capacitor series network 21, a second capacitor parallel network 22 composed of varactor diodes, a second rectifying circuit 23, a second filter circuit 24, a second voltage dividing circuit 25 and a second choke coil 26. The receiving coil 20 is of the same size as the transmitting coil 11. The rest parts are the same as the corresponding parts of the magnetic resonance energy emitting device, and are not described in detail herein. The receiving coil 20, the second capacitor series network 21 and the second capacitor parallel network 22 formed by the varactors are sequentially cascaded, that is, the parallel networks of L20, C211 and C212, C221, Cj222 and Cj223 are sequentially connected in series, and the other ends of C221, Cj222 and Cj223 are all grounded. The input end of the second rectifying circuit 23 is connected with the connection point between the second receiving coil 20 and the second capacitor series network 21, that is, one end of the D23 is connected with the middle connecting line of the L20 and the C221. The rectifying circuit II 23, the filtering circuit II 24, the voltage dividing circuit II 25 and the choke coil II 26 are sequentially cascaded, namely the other end of the D23, one end of the C241 and the C242 which are connected in parallel, the R251 and the RFC26 are sequentially connected in series, the R252 is connected with one end of the R251, and the other ends of the R252, the C241 and the C242 are grounded. The output end of the second choke coil 26 is connected with the cathode of the capacitance diode in the capacitance parallel network two 22 formed by the capacitance diode, namely the cathode of the other ends Cj222 and Cj223 of the RFC 26. According to the distance-frequency adaptive magnetic resonance energy transmitter in the embodiment, when the distance between the transmitting coil 11 and the receiving coil 20 is changed within the range of 10-20 mm and the centers are aligned, the output frequency of the system is dynamically adjusted between 1.8-2.2 MHz and is finally stabilized at 2 MHz.
The foregoing is only a preferred embodiment of the present invention. The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it is therefore intended that all such equivalent changes and modifications as would be obvious to one skilled in the art be included herein are deemed to be within the scope and spirit of the present invention as defined by the appended claims.
Claims (8)
1. A distance-frequency adaptive magnetic resonance energy transmitter comprises a magnetic resonance energy transmitting device and a magnetic resonance energy receiving device; the method is characterized in that:
the magnetic resonance energy transmitting device consists of a Class-E power amplifying circuit (10), a transmitting coil (11), a first capacitor series network (12), a first capacitor parallel network (13), a first voltage division circuit (14), a first rectifying circuit (15), a first filter circuit (16) and a first choke coil (17); the Class-E power amplifier circuit comprises a Class-E power amplifying circuit (10), a transmitting coil (11), a first capacitor series network (12) and a first capacitor parallel network (13) which are sequentially cascaded; the input end of the first voltage division circuit (14) is connected with a connection point between the transmitting coil (11) and the first capacitor series network (12), the output end of the first voltage division circuit (14), the first rectifying circuit (15), the first filter circuit (16) and the first choke coil (17) are sequentially cascaded, and the output end of the first choke coil (17) is connected with the cathode of a capacitance-variable diode in the first capacitor parallel network (13);
the magnetic resonance energy receiving device consists of a receiving coil (20), a second capacitor series network (21), a second capacitor parallel network (22), a second rectifying circuit (23), a second filtering circuit (24), a second voltage division circuit (25) and a second choking coil (26); the receiving coil (20), the second capacitor series network (21) and the second capacitor parallel network (22) are sequentially cascaded; the input end of the second rectifying circuit (23) is connected with a connection point between the receiving coil (20) and the second capacitor series network (21), the output end of the second rectifying circuit (23), the second filter circuit (24), the second voltage division circuit (25) and the second choke coil (26) are sequentially cascaded, and the output end of the second choke coil (26) is connected with the cathode of a capacitance-variable diode in the second capacitor parallel network (22);
the first capacitor parallel network (13) and the second capacitor parallel network (22) are respectively formed by connecting a capacitor and at least two variable capacitance diodes in parallel.
2. The range-frequency adaptive magnetic resonance energy transmitter of claim 1, characterized in that: the Class-E power amplification circuit (10) is composed of a bias circuit consisting of a high-frequency power tube, two divider resistors and a high-frequency choke coil, and a capacitor connected with the output end of the high-frequency power tube in parallel; the working frequency range of the high-frequency power tube is 1-100 MHz, and the minimum output power is 10W; the resistance ranges of the two divider resistors are 10-200 k omega; the working range of the high-frequency choke coil is 0.1-10 MHz; the capacitance value range of the capacitor connected with the output end of the high-frequency power tube in parallel is 100-4700 pF.
3. The range-frequency adaptive magnetic resonance energy transmitter of claim 1, characterized in that: the transmitting coil (11), the capacitor series network I (12) and the capacitor parallel network I (13) form a resonant network; and the receiving coil (20), the second capacitor series network (21) and the second capacitor parallel network (22) form a resonant network.
4. The range-frequency adaptive magnetic resonance energy transmitter of claim 1, characterized in that: the capacitor series network I (12) is formed by connecting at least two capacitors in series, and the capacitance value range of each capacitor is 100-4700 pF.
5. The range-frequency adaptive magnetic resonance energy transmitter of claim 1, characterized in that: the capacitance range of the capacitor is 100-1000 pF, and the variable capacitance range of the variable capacitance diode is 50-470 pF.
6. The range-frequency adaptive magnetic resonance energy transmitter of claim 1, characterized in that: the first voltage division circuit (14) and the second voltage division circuit (25) are voltage division networks formed by two resistors respectively, and the resistance range of the resistors is 10-100 k omega.
7. The range-frequency adaptive magnetic resonance energy transmitter of claim 1, characterized in that: the rectifying circuit I (15) and the rectifying circuit II (23) are both single rectifying diodes or bridge rectifying circuits.
8. The range-frequency adaptive magnetic resonance energy transmitter of claim 1, characterized in that: the choke coil I (17) is used for coupling a direct current signal output by the filter circuit I (16) to a cathode of a capacitance-variable diode in the capacitance parallel network I (13) as a reverse bias voltage of the direct current signal, and meanwhile, an alternating current signal is prevented from being transmitted to the filter circuit I (16); the second choke coil (26) is used for coupling the direct current signal output by the second filter circuit (24) to the cathode of the capacitance diode in the second capacitor parallel network (22) as a reverse bias voltage of the direct current signal, and meanwhile, the transmission of the alternating current signal to the second filter circuit (24) is cut off.
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