CN113541323B - Multi-capacity energy transmission system with multi-constant-current output - Google Patents
Multi-capacity energy transmission system with multi-constant-current output Download PDFInfo
- Publication number
- CN113541323B CN113541323B CN202110823070.7A CN202110823070A CN113541323B CN 113541323 B CN113541323 B CN 113541323B CN 202110823070 A CN202110823070 A CN 202110823070A CN 113541323 B CN113541323 B CN 113541323B
- Authority
- CN
- China
- Prior art keywords
- relay unit
- port
- plate
- capacitance
- transmitting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000005540 biological transmission Effects 0.000 title claims abstract description 57
- 230000008878 coupling Effects 0.000 claims abstract description 15
- 238000010168 coupling process Methods 0.000 claims abstract description 15
- 238000005859 coupling reaction Methods 0.000 claims abstract description 15
- 230000005684 electric field Effects 0.000 claims abstract description 13
- 239000003990 capacitor Substances 0.000 claims description 48
- 238000000034 method Methods 0.000 claims description 26
- 230000003071 parasitic effect Effects 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 9
- 238000012546 transfer Methods 0.000 description 9
- 230000000295 complement effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006880 cross-coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000005670 electromagnetic radiation Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
Classifications
-
- 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
- H02J50/05—Circuit arrangements or systems for wireless supply or distribution of electric power using capacitive coupling
-
- 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
- H02J50/50—Circuit arrangements or systems for wireless supply or distribution of electric power using additional energy repeaters between transmitting devices and receiving devices
- H02J50/502—Circuit arrangements or systems for wireless supply or distribution of electric power using additional energy repeaters between transmitting devices and receiving devices the energy repeater being integrated together with the emitter or the receiver
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Power Engineering (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
The invention discloses a multi-capacity energy transmission system with multi-constant current output, belonging to the field of wireless energy transmission; the multi-capacity energy transmission system with multi-constant current output comprises relay units #0- # N which are arranged in a linear sequence, wherein adjacent relay units perform energy transmission through electric field coupling between a transmitting polar plate and a receiving polar plate; the relay unit #0 comprises two transmitting polar plates, the relay units #1- # N-1 comprise two receiving polar plates and two transmitting polar plates which are vertically arranged, the relay unit #N comprises two receiving polar plates, an equivalent pi model of a capacitive coupler comprising a plurality of relay units is provided, a compensation network with split inductance is designed, and constant current output irrelevant to loads is realized; the system has the advantages of being capable of prolonging the transmission distance, realizing decoupling of the relay unit, enabling different loads not to interfere with each other, being simple in control flow and low in cost.
Description
Technical Field
The disclosure belongs to the field of wireless energy transmission, and in particular relates to a multi-capacity energy transmission system with multi-constant current output.
Background
The electric field coupling type wireless electric energy transmission (Capacitive Wireless Power Transfer, CPT) system takes a high-frequency electric field as an energy carrier, high-frequency alternating current acts on a transmitting polar plate, an alternating electric field is formed between the transmitting polar plate and a receiving polar plate, and further displacement current is generated, so that energy transmission between polar plates is realized, and the electric field coupling type wireless electric energy transmission system has the advantages of being capable of penetrating a metal isolation layer, low in electromagnetic radiation, small in size and the like, and has been widely paid attention to researchers in recent years. Currently, many studies of electric field coupling type wireless power transmission systems focus on supplying power to a single load, however, in some cases, it is necessary to simultaneously supply power to a plurality of loads at a constant current, such as charging a battery in series and supplying power to a plurality of Light Emitting Diodes (LEDs). Existing multi-load electric field coupled wireless power transfer systems require that the distance between adjacent transmit plates and adjacent receive plates be large enough to reduce cross coupling, but this can result in a large footprint for the coupler. In addition, when the distance between the transmitting electrode plate and the receiving electrode plate of the capacitive coupler is large, the mutual capacitance is small, and thus, long-distance energy transmission cannot be performed.
In recent years, the present inventors have proposed a structure in which a magnetic field coupled radio power transmission (Inductive Wireless Power Transfer, IPT) system including a plurality of relay units supplies power to a plurality of loads, which has an advantage that a transmission distance can be extended and coil coupling in the relay units can be eliminated, however, eddy current loss and high cost of the magnetic field coupled radio power transmission system become important causes for restricting the development thereof. In addition, no learner has studied an equivalent pi model of a capacitive coupler including a plurality of plates in the existing multi-load electric field coupling type wireless power transmission system. Therefore, the design has constant current output characteristics, an equivalent model of a capacitive coupler with a plurality of relay units is established, an electric field coupling wireless power transmission system with the plurality of relay units is adopted to simultaneously supply power to a plurality of loads, the transmission distance is prolonged, and the realization of decoupling of the relay units has important significance for the development of wireless energy transmission technology.
Disclosure of Invention
Aiming at the defects of the prior art, the purpose of the present disclosure is to provide a multi-capacity energy transmission system with multi-constant current output, which solves the problem that the wireless power transmission system in the prior art cannot perform long-distance energy transmission and multi-load power supply.
The purpose of the disclosure can be achieved by the following technical scheme:
a multi-capacity energy transmission system with multi-constant current output comprises an inverter and relay units #0- # N which are arranged in a linear sequence, wherein energy transmission is carried out between adjacent relay units through electric field coupling between a transmitting polar plate and a receiving polar plate;
further, the relay unit #0 includes a transmitting plate P 1 and P2 The relay unit #m (m=1, 2, …, N-1) includes a transmitting plate P 4(m-1)+3 and P4(m-1)+4 Receiving pole plate P 4m+1 and P4m+2 The relay unit #n includes a receiving electrode plate P 4(N-1)+3 and P4(N-1)+4 The method comprises the steps of carrying out a first treatment on the surface of the The input voltage of the relay unit #0 is the output voltage of the inverter.
Further, the relay unit #0 includes a compensating inductance L 1_1 and L1_2 L compensation network comprising split inductor and external capacitorC ex,1 Wherein, compensate inductance L 1_1 and L1_2 Is connected to the output of the inverter, and is connected to the external capacitor C ex,1 Connected with an external capacitor C ex,1 And transmitting polar plate P 1 and P2 Parallel connection, L 1_1 ＝L 1_2 。
3. The multi-capacity energy transmission system with multi-constant current output according to claim 1, wherein the relay unit #m (m=1, 2, …, N-1) includes a compensating inductance L s,m_1 、L s,m_2 、L f,m+1_1 、L f,m+1_2 And compensation capacitor C 3,m+1 LCL compensation network comprising split inductor and external capacitor C ex,2m And C ex,2m+1 And a load resistor R L,m Wherein the external capacitance C ex,2m And transmitting polar plate P 4(m-1)+3 and P4(m-1)+4 Parallel, compensating inductance L s,m_1 and Ls,m_2 Left side and external capacitance C ex,2m Connected with load resistor R L,m Left side and compensating inductance L s,m_1 The right side is connected with a load resistor R L,m Compensating inductance L s,m_2 Right side of (C) and compensation capacitor C 3,m+1 Connected to, compensating inductance L f,m+1_1 And L is equal to f,m+1_2 Left side of (C) and compensation capacitor C 3,m+1 Connected to, compensating inductance L f,m+1_1 And L is equal to f,m+1_2 Right side of (C) and external capacitance C ex,2m+1 Connected to an external capacitor C ex,2m+1 And receiving polar plate P 4m+1 and P4m+2 Parallel connection, L s,m_1 ＝L s,m_2 ，L f,m+1_1 ＝L f,m+1_2 。
Further, the relay unit #n includes a compensating inductance L N_1 and LN_2 L compensation network comprising split inductor and external capacitor C ex,N And a load resistor R L,N Wherein the external capacitance C ex,N And receiving polar plate P 4(N-1)+3 and P4(N-1)+4 Parallel, compensating inductance L N_1 and LN_2 Left side of (C) and external capacitance C ex,N Connected with load resistor R L,N Left side of (d) and compensating inductance L N_1 Is connected to the right side of the load resistor R L,N Right side of (d) and compensating inductance L N_2 Is connected to the right side of L N_1 ＝L N_2 。
Further, the transmitting electrode plate P in the relay unit #0 1 and P2 On the same plane, the receiving plate P in the relay unit #m 4(m-1)+3 and P4(m-1)+4 On the same plane, the transmitting electrode plate P in the relay unit #m 4m+1 And P 4m+2 On the same plane, the receiving electrode plate P in the relay unit #N 4(N-1)+3 and P4(N-1)+4 On the same plane and in the relay unit #m 4(m-1)+3 、P 4(m-1)+4 And transmitting polar plate P 4m+1 、P 4m+2 And (3) vertically, all the polar plates are equal in size.
Further, the transmitting electrode plate P in the relay unit #0 1 and P2 Constitute port 1, receiving plate P in relay unit #m 4(m-1)+3 and P4(m-1)+4 Form the transmitting electrode plate P in the port 2m and the relay unit #m 4m+1 and P4m+2 Constitute port 2m+1, receiving plate P in relay unit #N 4(N-1)+3 and P4(N-1)+4 Forming port 2N; self-capacitance C of port a port,a (a=1, 2, …, 2N) is:
wherein ,Ci,j Is a polar plate P i And polar plate P j Coupling capacitance between i, j=1, 2, …,4 (N-1) +4, i+.j;
mutual capacitance C between any two ports a and b Ma,b (a, b=1, 2, …,2n, a+.b) is:
since the relay unit #m includes the port 2m and the port 2m+1, and the facing areas of the electrode plates are equal, C can be obtained 4m,4m+2 ＝C 4m-1,4m ＝C 4m-1,4m+2 ＝C 4m,4m-1 Substituting into (2) to obtainMutual capacitance C in relay unit #m M2m,2m+1 0, thereby realizing decoupling of a relay unit #m in a multi-capacity energy transmission system containing a plurality of constant current outputs;
sum of mutual capacitances C of port a and the remaining ports Mport,a (a=1, 2, …, 2N) is:
further, the transmitting electrode plate P in the relay unit #m-1 4(m-1)+1 、P 4(m-1)+2 And receiving plate P in relay unit #m 4(m-1)+3 、P 4(m-1)+4 The internal self-capacitance at the left side port 2m-1 and the right side port 2m of the capacitive coupler m is C respectively port,2m-1 and Cport,2m The method comprises the steps of carrying out a first treatment on the surface of the When the left side port and the right side port are respectively connected in parallel with an external capacitor C ex,2m-1 and Cex,2m After that, the equivalent self-capacitance of the left side port and the right side port is C respectively s,2m-1 and Cs,2m Can be expressed as:
C s,2m-1 ＝C port,2m-1 +C ex,2m-1 ,C s,2m ＝C port,2m +C ex,2m
equivalent input capacitance C looking into the left-hand port of capacitive coupler m pri,m The method comprises the following steps:
the working angular frequency of the inverter is omega 0 In order to realize constant current output, the resonance conditions are:
compensating capacitor C 3,m The method comprises the following steps:
when the parasitic resistances of all the compensation inductances and compensation capacitances are ignored, the current flows through the load R L,m Is the current I of (2) RL,m The method comprises the following steps:
wherein ,Vin1 For an effective value of the fundamental component of the inverter output voltage,the output current of the first load lags behind the output voltage of the inverter by 90 DEG, I RL,m ＝-I RL,m-1 。
The beneficial effects of the present disclosure are: an equivalent model of the capacitive coupler with a plurality of relay units is established, the transmission distance is prolonged, the decoupling and constant current output of the relay units are realized, and different loads are not interfered with each other, so that the control flow is simple, and the cost is low.
Drawings
In order to more clearly illustrate the embodiments of the present disclosure or the prior art, the drawings that are required for the description of the embodiments or the prior art will be briefly described, and it will be apparent to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a schematic diagram of the overall structure of a transmission system of the present disclosure;
FIG. 2 is a schematic diagram of a capacitive coupler of the present disclosure;
FIG. 3 is a schematic diagram of an equivalent pi circuit model of a capacitive coupler of the present disclosure;
FIG. 4 is a simplified equivalent pi circuit model schematic diagram of the present disclosure;
FIG. 5 is a schematic diagram of a multi-capacity energy transfer system topology including three constant current outputs for use in the present disclosure;
FIG. 6 is a schematic diagram of a capacitive coupler of a multi-capacity energy transfer system of the present disclosure having three constant current outputs;
fig. 7 is a schematic diagram of an equivalent pi circuit model of a capacitive coupler structure of a multi-capacity energy transfer system with three constant current outputs of the present disclosure;
FIG. 8 is a simplified equivalent pi circuit model schematic of a multi-capacity energy transfer system with three constant current outputs of the present disclosure;
fig. 9 is a schematic waveform diagram of an output current of a multi-capacity energy transmission system with three constant current outputs of the present disclosure (RL, 1=rl, 2=rl, 3=6Ω);
fig. 10 is a schematic diagram of waveforms (RL, 1=rl, 2=rl, 3=11.7Ω) of an output current of a multi-capacity energy transmission system with three constant current outputs according to the present disclosure.
Detailed Description
The following description of the technical solutions in the embodiments of the present disclosure will be made clearly and completely with reference to the accompanying drawings in the embodiments of the present disclosure, and it is apparent that the described embodiments are only some embodiments of the present disclosure, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments in this disclosure without inventive faculty, are intended to fall within the scope of this disclosure.
As shown in fig. 1, the multi-capacity energy transmission system with multi-constant current output comprises 1 inverter and (n+1) relay units; the DC input voltage of the inverter is V dc The arrangement sequence of all the relay units is as follows: relay unit #0, relay unit #1, and so on, until relay unit #m, and finally relay unit #n, where m=1, 2, …, N-1; the input voltage of the 1 st relay unit is the output voltage V of the inverter in The method comprises the steps of carrying out a first treatment on the surface of the Relay unit #0 includes a transmitting plate P 1 and P2 Compensating inductance L 1_1 and L1_2 L compensation network comprising split inductor and external capacitor C ex,1 Wherein, compensate inductance L 1_1 and L1_2 Is connected to the output of the inverter, and is connected to the external capacitor C ex,1 Connected with an external capacitor C ex,1 And transmitting polar plate P 1 and P2 Parallel connection, L 1_1 ＝L 1_2 The method comprises the steps of carrying out a first treatment on the surface of the The relay unit #m (m=1, 2, …, N-1) includes a transmitting plate P 4(m-1)+3 and P4(m-1)+4 Receiving pole plate P 4m+1 and P4m+2 Compensating inductance L s,m_1 、L s,m_2 、L f,m+1_1 、L f,m+1_2 And compensation capacitor C 3,m+1 LCL compensation network comprising split inductor and external capacitor C ex,2m And C ex,2m+1 And a load resistor R L,m Wherein the external capacitance C ex,2m And transmitting polar plate P 4(m-1)+3 and P4(m-1)+4 Parallel, compensating inductance L s,m_1 and Ls,m_2 Left side and external capacitance C ex,2m Connected with load resistor R L,m Left side and compensating inductance L s,m_1 The right side is connected with a load resistor R L,m Compensating inductance L s,m_2 Right side of (C) and compensation capacitor C 3,m+1 Connected to, compensating inductance L f,m+1_1 And L is equal to f,m+1_2 Left side of (C) and compensation capacitor C 3,m+1 Connected to, compensating inductance L f,m+1_1 And L is equal to f,m+1_2 Right side of (C) and external capacitance C ex,2m+1 Connected to an external capacitor C ex,2m+1 And receiving polar plate P 4m+1 and P4m+2 Parallel connection, L s,m_1 ＝L s,m_2 ，L f,m+1_1 ＝L f,m+1_2 The method comprises the steps of carrying out a first treatment on the surface of the The relay unit #N comprises a receiving plate P 4(N-1)+3 and P4(N-1)+4 Compensating inductance L N_1 and LN_2 L compensation network comprising split inductor and external capacitor C ex,N And a load resistor R L,N Wherein the external capacitance C ex,N And receiving polar plate P 4(N-1)+3 and P4(N-1)+4 Parallel, compensating inductance L N_1 and LN_2 Left side of (C) and external capacitance C ex,N Connected with load resistor R L,N Left side of (d) and compensating inductance L N_1 Is connected to the right side of the load resistor R L,N Right side of (d) and compensating inductance L N_2 Is connected to the right side of L N_1 ＝L N_2 ；
As shown in fig. 2, m=1, 2, …, N-1, the transmitting plate P in the relay unit #0 1 and P2 On the same plane, the receiving plate P in the relay unit #m 4(m-1)+3 and P4(m-1)+4 On the same plane, the transmitting electrode plate P in the relay unit #m 4m+1 And P 4m+2 On the same plane, the receiving electrode plate P in the relay unit #N 4(N-1)+3 and P4(N-1)+4 On the same plane and in the relay unit #m 4(m-1)+3 、P 4(m-1)+4 And transmitting polar plate P 4m+1 、P 4m+2 Perpendicular, all polar plates are equal in size; transmitting plate P in Relay unit #0 1 、P 2 And receiving plate P in relay unit #1 3 、P 4 Constitute a capacitive coupler 1, and a transmitting electrode plate P in a relay unit #1 5 、P 6 And receiving plate P in relay unit #2 7 、P 8 Forming a capacitive coupler 2, and so on, up to the transmitting plate P in the repeater unit #m-1 4(m-1)+1 、P 4(m-1)+2 And receiving plate P in relay unit #m 4(m-1)+3 、P 4(m-1)+4 Constitute a capacitive coupler m, finally to the transmitting plate P in the repeater unit #N-1 4(N-1)+1 、P 4(N-1)+2 And receiving plate P in relay unit #N 4(N-1)+3 、P 4(N-1)+4 The capacitive coupler N is formed, the capacitive coupler 1, the capacitive couplers 2 and …, the capacitive couplers m and … and the capacitive coupler N form a capacitive coupler of a multi-capacity energy transmission system with multi-constant-current output, wherein two transmitting polar plates and two receiving polar plates forming the capacitive coupler are parallel, and the system carries out wireless transmission of electric energy sequentially through the capacitive coupler 1, the capacitive couplers 2 and …, the capacitive couplers m and … and the capacitive coupler N; transmitting plate P in Relay unit #0 1 and P2 Constitute port 1, receiving plate P in relay unit #m 4(m-1)+3 and P4(m-1)+4 Form the transmitting electrode plate P in the port 2m and the relay unit #m 4m+1 and P4m+2 Constitute port 2m+1, receiving plate P in relay unit #N 4(N-1)+3 and P4(N-1)+4 Forming port 2N; self-capacitance C of port a port,a (a=1, 2, …, 2N) is:
wherein ,Ci,j Is a polar plate P i And polar plate P j Coupling capacitance between i, j=1, 2, …,4 (N-1) +4, i+.j;
mutual capacitance C between any two ports a and b Ma,b (a, b=1, 2, …,2n, a+.b) is:
since the relay unit #m includes the port 2m and the port 2m+1, and the facing areas of the electrode plates are equal, C can be obtained 4m,4m+2 ＝C 4m-1,4m ＝C 4m-1,4m+2 ＝C 4m,4m-1 Substituting into (2) to obtain mutual capacitance C in relay unit #m M2m,2m+1 0, thereby realizing decoupling of a relay unit #m in the multi-capacity energy transmission system with multi-constant current output;
sum of mutual capacitances C of port a and the remaining ports Mport,a (a=1, 2, …, 2N) is:
therefore, an equivalent pi model of a capacitive coupler of a multi-capacity energy transmission system with multi-constant current output is shown in fig. 3: the self-capacitance of all ports can be obtained by the formula (1), the mutual capacitance of any two ports can be obtained by the formula (2), and the sum of the mutual capacitances of any one port and the rest ports can be obtained by the formula (3).
As shown in FIG. 4, the simplified equivalent pi model of the multi-capacity energy transmission system with multi-constant current output is negligible because the mutual capacitance between any two non-adjacent ports is small, and because the mutual capacitance in the relay unit #m is 0, only the mutual capacitance C of the capacitive coupler m needs to be considered when designing a compensation network of the multi-capacity energy transmission system with multi-constant current output M2m-1,2m As can be obtained from the formula (2), the internal self-capacitances at the left side port 2m-1 and the right side port 2m of the capacitive coupler m are respectively C port,2m-1 and Cport,2m Can be obtained from formula (1); when the left side port and the right side port are respectively connected in parallel with an external capacitor C ex,2m-1 and Cex,2m After that, the equivalent self-capacitance of the left side port and the right side port is C respectively s,2m-1 and Cs,2m Can be expressed as:
C s,2m-1 ＝C port,2m-1 +C ex,2m-1 ,C s,2m ＝C port,2m +C ex,2m (4)
equivalent input capacitance C looking into the left-hand port of capacitive coupler m pri,m The method comprises the following steps:
the working angular frequency of the inverter is omega 0 In order to realize constant current output, the resonance conditions are:
compensating capacitor C 3,m The method comprises the following steps:
when the parasitic resistances of all the compensation inductances and compensation capacitances are ignored, the current flows through the load R L,m Is the current I of (2) RL,m The method comprises the following steps:
wherein ,Vin1 Since the inverter operates in the complementary mode, which is an effective value of the fundamental component of the output voltage of the inverter, it can be expressed asIt can be seen that the output current of the first load lags the inverter output voltage by 90 degBy substituting formula (7) into formula (8), I can be obtained RL,m ＝-I RL,m-1 Therefore, in the multi-load electric field coupling type wireless power transmission system with the multi-relay unit, the current amplitudes flowing through two adjacent loads are equal, namely |I RL,1 |＝|I RL,2 |,…＝|I RL,N And the phase difference of the current flowing through two adjacent loads is 180 degrees, which is irrelevant to the load resistance, so that the multi-capacity energy transmission system with multi-constant current output is realized.
A multi-capacity energy transmission system including three constant current outputs will be specifically described below as an example.
The multi-capacity energy transmission system with multi-constant current output as shown in fig. 5 comprises 1 inverter and 4 relay units; the DC input voltage of the inverter is V dc The arrangement sequence of all the relay units is as follows: relay unit #0, relay unit #1, relay unit #2, relay unit #3; the input voltage of the 1 st relay unit is the output voltage V of the inverter in ；
Relay unit #0 includes a transmitting plate P 1 and P2 Compensating inductance L 1_1 and L1_2 L compensation network comprising split inductor and external capacitor C ex,1 Wherein, compensate inductance L 1_1 and L1_2 Is connected to the output of the inverter, and is connected to the external capacitor C ex,1 Connected with an external capacitor C ex,1 And transmitting polar plate P 1 and P2 Parallel connection, L 1_1 ＝L 1_2 ；
The relay unit #1 includes a transmitting plate P 3 and P4 Receiving pole plate P 5 and P6 Compensating inductance L s,1_1 、L s,1_2 、L f,2_1 、L f,2_2 And compensation capacitor C 3,2 LCL compensation network comprising split inductor and external capacitor C ex,2 And C ex,3 And a load resistor R L,1 Wherein the external capacitance C ex,2 And transmitting polar plate P 3 and P4 Parallel to each other, compensating inductance L s,1_1 and Ls,1_2 Left side and external capacitance C ex,2 Connected with load resistor R L,1 Left side and compensating inductance L s,1_1 The right side is connected with a load resistor R L,1 Compensating inductance L s,1_2 Right side of (C) and compensation capacitor C 3,2 Connected to, compensating inductance L f,2_1 And L is equal to f,2_2 Left side of (C) and compensation capacitor C 3,2 Connected to, compensating inductance L f,2_1 And L is equal to f,2_2 Right side of (C) and external capacitance C ex,3 Connected to an external capacitor C ex,3 And receiving polar plate P 5 and P6 Parallel connection, L s,1_1 ＝L s,1_2 ，L f,2_1 ＝L f,2_2 ；
The relay unit #2 includes a transmitting plate P 7 and P8 Receiving pole plate P 9 and P10 Compensating inductance L s,2_1 、L s,2_2 、L f,3_1 、L f,3_2 And compensation capacitor C 3,3 LCL compensation network comprising split inductor and external capacitor C ex,4 And C ex,5 And a load resistor R L,2 Wherein the external capacitance C ex,4 And transmitting polar plate P 7 and P8 Parallel to each other, compensating inductance L s,2_1 and Ls,2_2 Left side and external capacitance C ex,4 Connected with load resistor R L,2 Left side and compensating inductance L s,2_1 The right side is connected with a load resistor R L,2 Compensating inductance L s,2_2 Right side of (C) and compensation capacitor C 3,3 Connected to, compensating inductance L f,3_1 And L is equal to f,3_2 Left side of (C) and compensation capacitor C 3,3 Connected to, compensating inductance L f,3_1 And L is equal to f,3_2 Right side of (C) and external capacitance C ex,5 Connected to an external capacitor C ex,5 And receiving polar plate P 9 and P10 Are connected in parallel with L s,3_1 ＝L s,3_2 ，L f,4_1 ＝L f,4_2 ；
Relay unit #4 includes a receiver plate P 11 and P12 Compensating inductance L N_1 and LN_2 L compensation network comprising split inductor and external capacitor C ex,6 And a load resistor R L,3 Wherein the external capacitance C ex,6 And receiving polar plate P 11 and P12 Parallel, compensating inductance L N_1 and LN_2 Left side of (C) and external capacitance C ex,6 Connected with load resistor R L,3 Left side of (d) and compensating inductance L N_1 Is connected to the right side of the load resistor R L,3 Right side of (d) and compensating inductance L N_2 Is connected to the right side of L N_1 ＝L N_2 ；
As shown in FIG. 6, a capacitive coupler for a multi-capacity energy transfer system having three constant current outputs includes a plate P 1 、P 2 、P 3 、P 4 、P 5 、P 6 、P 7 、P 8 、P 9 、P 10 、P 11 and P12 All plates are equal in size, the transmitting plate P in the repeater #0 1 and P2 On the same plane, the receiving plate P in the relay unit #1 3 and P4 On the same plane, the transmitting plate P in the relay unit #1 5 And P 6 On the same plane, the receiving plate P in the relay unit #2 7 and P8 On the same plane, the transmitting plate P in the relay unit #2 9 and P10 On the same plane, the receiving plate P in the relay unit #3 11 And P 12 On the same plane and receiving plate P in relay unit #1 3 、P 4 And transmitting polar plate P 5 、P 6 Vertical, receiving plate P in relay unit #2 7 、P 8 And transmitting polar plate P 9 、P 10 Vertical; transmitting plate P in Relay unit #0 1 、P 2 And receiving plate P in relay unit #1 3 and P4 Constitute a capacitive coupler 1, and a transmitting electrode plate P in a relay unit #1 5 、P 6 And receiving plate P in relay unit #2 7 、P 8 Constitute a capacitive coupler 2, a transmitting electrode plate P in a relay unit #2 9 、P 10 And receiving plate P in relay unit #3 11 and P12 The capacitive coupler 3 is formed, and the capacitive coupler 1, the capacitive coupler 2 and the capacitive coupler 3 form a capacitive coupler of a multi-capacity energy transmission system with multi-constant current output; the system sequentially carries out wireless transmission of electric energy through the capacitive coupler 1, the capacitive coupler 2 and the capacitive coupler 3; in (a)Transmitting plate P in relay unit #0 1 and P2 Constitute port 1, receiving plate P in relay unit #1 3 and P4 Constitute port 2, transmitting plate P in relay unit #1 5 and P6 Constitute port 3, receiving plate P in relay unit #1 7 and P8 Constitute port 4, transmitting plate P in relay unit #2 9 and P10 Constitute port 5, receiving plate P in relay unit #3 11 and P12 Self-capacitance C of each port constituting port 6 port,a (a=1, 2, …, 6) is:
wherein ,Ci,j Is a polar plate P i And polar plate P j Coupling capacitances between i, j=1, 2, …,12, i+.j.
Mutual capacitance C between any two ports a and b Ma,b (a, b=1, 2, …,6, a+.b) is:
the relay unit #1 includes the port 2 and the port 3, and since the facing areas of the electrode plates are equal, C can be obtained 4,6 ＝C 3,4 ＝C 3,6 ＝C 4,3 Substituting into (2) can obtain the mutual capacitance C in the relay unit #1 M2,3 Is 0; the relay unit #2 includes the port 4 and the port 5, and since the facing areas of the electrode plates are equal, C can be obtained 8,10 ＝C 7,8 ＝C 7,10 ＝C 8,7 Substituting into (2) can obtain the mutual capacitance C in the relay unit #2 M4,5 Is 0; decoupling of the relay unit #1 and the relay unit #2 is thereby achieved.
Sum of mutual capacitances C of port a and the remaining ports Mport,a (a=1, 2, …, 6) is:
thus, an equivalent pi model of a capacitive coupler of a multi-capacity energy transfer system with three constant current outputs is shown in fig. 7: the self-capacitance of all ports can be obtained by the formula (1), the mutual capacitance of any two ports can be obtained by the formula (2), and the sum of the mutual capacitances of any one port and the rest ports can be obtained by the formula (3).
A simplified equivalent pi model of a multi-capacity energy transmission system with three constant current outputs is shown in figure 8, C is a small mutual capacitance between any two non-adjacent ports M1,3 、C M1,4 、C M1,5 、C M1,6 、C M2,4 、C M2,5 、C M2,6 、C M3,5 、C M3,6 and CM4,6 Negligible and due to the mutual capacitance C in the repeater unit #1 M2 , 3 0, the mutual capacitance C in the relay unit #2 M4,5 0, so that only the mutual capacitance of the capacitive coupler 1 is considered to be C when designing a compensation network of a multi-capacity energy transmission system with four constant current outputs M1,2 The mutual capacitance of the capacitive coupler 2 is C M3,4 And the mutual capacitance C of the capacitive coupler 3 M5,6 The method comprises the steps of carrying out a first treatment on the surface of the The internal self-capacitance at the left side port 1 and the right side port 2 of the capacitive coupler 1 is C respectively port,1 and Cport,2 Can be obtained from formula (1); when the left side port and the right side port are respectively connected in parallel with an external capacitor C ex,1 and Cex,2 After that, the equivalent self-capacitance of the left side port and the right side port is C respectively s,1 and Cs,2 The method comprises the steps of carrying out a first treatment on the surface of the The internal self-capacitance at the left 3 and right 4 ports of the capacitive coupler 2 is C respectively port,3 and Cport,4 Can be obtained from formula (1); when the left side port and the right side port are respectively connected in parallel with an external capacitor C ex,3 and Cex,4 After that, the equivalent self-capacitance of the left side port and the right side port is C respectively s,3 and Cs,4 The method comprises the steps of carrying out a first treatment on the surface of the The internal self-capacitance at the left 5 and right 6 ports of the capacitive coupler 3 is C respectively port,5 and Cport,6 Can be obtained from formula (1); when the left side port and the right side port are respectively connected in parallel with an external capacitor C ex,5 and Cex,6 After that, the equivalent self-capacitance of the left side port and the right side port is C respectively s,5 and Cs,6 The method comprises the steps of carrying out a first treatment on the surface of the The equivalent self-capacitance of the capacitive couplers 1,2 and 3 can be expressed as:
the equivalent input capacitance seen from the left port of the capacitive coupler 1 is C pri,1 The equivalent input capacitance seen from the left port of the capacitive coupler 2 is C pri,2 The equivalent input capacitance seen from the left port of the capacitive coupler 3 is C pri,3 Can be expressed as:
the working angular frequency of the inverter is omega 0 In order to realize constant current output, the resonance conditions are:
compensating capacitor C 3,2 and C3,3 The method comprises the following steps:
when the parasitic resistances of all the compensation inductances and compensation capacitances are ignored, the current flows through the load R L,1 The current of (2) is I RL,1 Through the load R L,2 The current of (2) is I RL,2 Through the load R L,3 The current of (2) is I RL,3 Can be expressed as:
wherein ,Vin1 Is an effective value of the fundamental component of the output voltage of the inverter, due to the fact that the inverter is provided withThe complementary mode of operation, and thus can be expressed asIt can be seen that the output current of the first load lags behind the inverter output voltage by 90 °, and that by substituting equation (7) into equation (8), it can be obtained that I RL,1 ＝-I RL,2 ＝I RL,3 Therefore, in the multi-load electric field coupling type wireless power transmission system with the multi-relay unit, the current amplitudes flowing through two adjacent loads are equal, namely |I RL,1 |＝|I RL,2 |,＝|I RL,3 And the phase difference of the current flowing through two adjacent loads is 180 degrees, which is irrelevant to the load resistance, so that the multi-capacity energy transmission system with three constant current outputs is realized.
Analysis of experimental results:
FIG. 9 shows the load resistance R L,1 ＝R L,2 ＝R L,3 When the output current of the multi-capacity energy transmission system with three constant current outputs is=6Ω, the output current of the first load is delayed by 90 ° from the output voltage of the inverter, the effective value of the output current of the first load is 0.748A, the effective value of the output current of the second load is 0.741A, the effective value of the output current of the third load is 0.736A, the three load currents are approximately equal, and the phase difference of the adjacent load currents is 180 °; FIG. 10 shows the load resistance R L,1 ＝R L,2 ＝R L,3 When the waveform of the output current of the multi-capacity energy transmission system with three constant current outputs is 11.7Ω, it can be seen that the output current of the first load lags behind the output voltage of the inverter by 90 °, the effective value of the output current of the first load is 0.746A, the effective value of the output current of the second load is 0.729A, the effective value of the output current of the third load is 0.717A, it can be seen that the three load currents are approximately equal, and the phase difference of the adjacent load currents is 180 °. In fig. 9 and 10, a small drop in the latter load relative to the former load current is due to the internal resistance in the compensation circuit. The experimental result shows that the multi-capacity energy transmission system with three constant current outputs realizes constant current output and load power decoupling of three loads。
From the above embodiments, it can be seen that the multi-capacity energy transmission system including multiple constant current outputs provided by the present invention can implement constant current output and load power decoupling.
In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims.
Claims (2)
1. The multi-capacity energy transmission system with multi-constant current output is characterized by comprising an inverter and relay units #0- # N which are arranged in a linear sequence, wherein energy transmission is carried out between adjacent relay units through electric field coupling between a transmitting polar plate and a receiving polar plate;
the relay unit #0 includes a transmitting electrode plate P 1 and P2 Relay unit #)m Comprising a transmitting polar plate P 4(m-1)+3 and P4(m-1)+4 Receiving pole plate P 4m+1 and P4m+2 The relay unit #n includes a relay unit #)NComprising a receiving polar plate P 4(N-1) +3 and P4(N-1) +4 The method comprises the steps of carrying out a first treatment on the surface of the The input voltage of the relay unit #0 is the output voltage of the inverter;
the relay unit #0 includes a compensating inductanceL 1_1 AndL 1_2 l compensation network comprising split inductor and external capacitorC ex, 1 Wherein, compensate inductanceL 1_1 AndL 1_2 is connected to the output of the inverter, and is connected to the external capacitorC ex, 1 Connected with an external capacitorC ex, 1 And transmitting polar plate P 1 and P2 The two electrodes are connected in parallel,L 1_1 = L 1_2 ；
the relay unit #)m Including compensating inductanceL s, m_1 、L s, m_2 、L f, m+1_1 、L f, m+1_2 Compensating capacitorC 3, m+1 LCL compensation network comprising split inductor and external capacitorC ex, 2m And (3) withC ex, 2m+1 And a load resistorR L, m Wherein the external capacitanceC ex, 2m And transmitting polar plate P 4(m-1)+3 and P4(m-1)+4 Parallel connection, compensating inductanceL s, m_1 AndL s, m_2 left side and external capacitanceC ex, 2m Connected to load resistorR L, m Left side and compensating inductanceL s, m_1 Right side is connected with load resistorR L, m Compensating inductanceL s, m_2 Right side of (d) and compensation capacitanceC 3, m+1 Connected to, compensating inductanceL f, m+1_1 And (3) withL f, m+1_2 Left side of (d) and compensation capacitanceC 3, m+1 Connected to, compensating inductanceL f, m+1_1 And (3) withL f, m+1_2 Right side of (d) and external capacitanceC ex, 2m+1 Connected to an external capacitorC ex, 2m+1 And receiving polar plate P 4m+1 and P4m+2 The two electrodes are connected in parallel,L s, m_1 = L s, m_2 ，L f, m+1_1 = L f, m+1_2 ；
the relay unit #)NIncluding compensating inductanceL N_1 AndL N_2 l compensation network comprising split inductor and external capacitorC ex, N And a load resistorR L, N Wherein the external capacitanceC ex, N And receiving polar plate P 4(N-1) +3 and P4(N-1) +4 Parallel connection, compensating inductanceL N_1 AndL N_2 left side and external capacitance of (2)C ex, N Connected to load resistorR L, N Left side of (d) and compensating inductanceL N_1 Is connected to the right side of the load resistorR L, N Right side of (d) and compensating inductanceL N_2 Is connected to the right side of the (c),L N_1 = L N_2 ；
transmitting plate P in the relay unit #0 1 and P2 On the same plane, relay unit #)mReceiving plate P of (a) 4(m-1)+3 and P4(m-1)+4 On the same plane, relay unit #)mIn the (a) transmitting electrode plate (P) 4m+1 And P 4m+2 On the same plane, relay unit #)NReceiving plate P of (a) 4(N-1) +3 and P4(N-1) +4 On the same plane, and relay unit #)mReceiving plate P of (a) 4(m-1)+3 、P 4(m-1)+4 And transmitting polar plate P 4m+1 、P 4m+2 Perpendicular, all polar plates are equal in size;
transmitting plate P in the relay unit #0 1 and P2 Constitute port 1, trunk #mReceiving plate P of (a) 4(m-1)+3 and P4(m-1)+4 Form port 2mRelay unit #)mIn the (a) transmitting electrode plate (P) 4m+1 and P4m+2 Form port 2m+1, relay Unit #)NReceiving plate P of (a) 4(N-1) +3 and P4(N-1) +4 Form port 2NThe method comprises the steps of carrying out a first treatment on the surface of the Port (port)aSelf-capacitance of (2)C port, a The method comprises the following steps:
wherein ,C i, j is a polar plate P i And polar plate P j The coupling capacitance between the two electrodes,i, j = 1, 2, …, 4(N-1) +4, i ≠ j；
any two portsaAndbmutual capacitance betweenC Ma, b The method comprises the following steps:
due to the relay unit #)mComprising port 2mAnd port 2m+1, and the facing areas of the electrode plates are equal, so thatC 4m, 4m +2 = C 4m-1, 4m = C 4m-1, 4m+2 = C 4m, 4m-1 Obtaining the relay unit #)mMutual capacitance in (a)C M2m, 2m+1 0, thereby realizing a relay unit # in a multi-capacity energy transmission system containing a plurality of constant current outputsmIs decoupled from (a);
port (port)aSum of mutual capacitances of remaining portsC Mport, a The method comprises the following steps:
。
2. the multi-capacity energy transmission system with multi-constant current output according to claim 1, wherein the relay unit #mEmitter plate P in-1 4(m-1)+1 、P 4(m-1)+2 And relay unit #)mReceiving plate P of (a) 4(m-1) +3 、P 4(m-1) +4 Forming a capacitive couplerm，Capacitive couplermLeft port 2 of (2)m-1 and right port 2mThe internal self-capacitance at the position is respectivelyC port, 2m-1 AndC port, 2m the method comprises the steps of carrying out a first treatment on the surface of the When the left side port and the right side port are respectively connected in parallel with an external capacitorC ex, 2m-1 AndC ex, 2m after that, the equivalent self-capacitance of the left side port and the right side port are respectivelyC s, 2m-1 And C s, 2m can be expressed as:
slave capacitive couplermEquivalent input capacitance seen into left side port of (c)C pri, m The method comprises the following steps:
the working angular frequency of the inverter isω 0 In order to realize constant current output, the resonance conditions are:
compensation capacitorC 3, m The method comprises the following steps:
when the parasitic resistances of all the compensating inductances and compensating capacitances are ignored, the current flows through the loadR L, m Is (1) the current of the (a)I RL, m The method comprises the following steps:
wherein ,V in1 for an effective value of the fundamental component of the inverter output voltage,the method comprises the steps of carrying out a first treatment on the surface of the The output current of the first load lags the inverter output voltage by 90,I RL, m = -I RL, m-1 。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110823070.7A CN113541323B (en) | 2021-07-21 | 2021-07-21 | Multi-capacity energy transmission system with multi-constant-current output |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110823070.7A CN113541323B (en) | 2021-07-21 | 2021-07-21 | Multi-capacity energy transmission system with multi-constant-current output |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113541323A CN113541323A (en) | 2021-10-22 |
| CN113541323B true CN113541323B (en) | 2023-08-22 |
Family
ID=78129118
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110823070.7A Active CN113541323B (en) | 2021-07-21 | 2021-07-21 | Multi-capacity energy transmission system with multi-constant-current output |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113541323B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113972749B (en) * | 2021-10-27 | 2023-08-11 | 西南交通大学 | Multiport capacitive coupling mechanism and CPT system of decoupling type compensation topology |
| CN115632493B (en) * | 2022-12-21 | 2023-03-14 | 成都西交轨道交通技术服务有限公司 | Multi-load power supply CPT system based on relay polar plate |
| CN115664054B (en) * | 2022-12-29 | 2023-03-14 | 成都西交轨道交通技术服务有限公司 | Vehicle-ground multi-load synchronous wireless power supply system based on relay polar plate |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109941128A (en) * | 2019-04-25 | 2019-06-28 | 西南交通大学 | A kind of electric car wireless charging technology voltage optimization method of field coupling formula |
| CN113036950A (en) * | 2021-02-25 | 2021-06-25 | 国网河北省电力有限公司 | Constant-current energy feeding device |
-
2021
- 2021-07-21 CN CN202110823070.7A patent/CN113541323B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109941128A (en) * | 2019-04-25 | 2019-06-28 | 西南交通大学 | A kind of electric car wireless charging technology voltage optimization method of field coupling formula |
| CN113036950A (en) * | 2021-02-25 | 2021-06-25 | 国网河北省电力有限公司 | Constant-current energy feeding device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113541323A (en) | 2021-10-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113541323B (en) | Multi-capacity energy transmission system with multi-constant-current output | |
| CN111049278B (en) | Anti-deviation LLC-S type wireless power transmission system and parameter design method thereof | |
| CN110994812B (en) | Anti-offset LCC-S type wireless power transmission system and parameter design method thereof | |
| CN109617250B (en) | Anti-deviation wireless power transmission system based on combined topology | |
| CN113381515B (en) | Power decoupling multi-load electric field coupling type wireless power transmission system | |
| CN105529837B (en) | A kind of determination method of radio energy transmission system constant-pressure compensation network topology | |
| CN106992683B (en) | Voltage source and current source combined excitation non-contact conversion circuit | |
| CN105429313A (en) | Wireless electric energy transmission system with switchable resonance compensation topology and control method thereof | |
| CN109888933B (en) | Primary-side multi-module high-frequency parallel wireless power transmission system | |
| CN113328531B (en) | Wireless power transmission method and system thereof | |
| Luo et al. | A voltage stress optimization method of capacitive power transfer charging system | |
| CN105515215B (en) | A kind of radio energy transmission system constant current compensates the determination method of network topology | |
| CN111082543B (en) | Anti-offset CLC-S type wireless power transmission system and parameter design method thereof | |
| CN106787240B (en) | The working method of composite LCL structure and the structure based on array lines ring type wireless energy transfer | |
| CN113972749B (en) | Multiport capacitive coupling mechanism and CPT system of decoupling type compensation topology | |
| Ning et al. | Comparative analysis of LCL, LCLC, CLLC compensation networks for capacitive power transfer | |
| CN115313687A (en) | Anti-deviation coupling mechanism and electric automobile wireless charging constant-voltage output control system | |
| CN113078741A (en) | Multi-end distributed uniform equal-power wireless power supply system | |
| CN115296431B (en) | Same-side decoupling type multi-emission multi-reception electric field coupling mechanism and EC-WPT system | |
| CN109980756B (en) | Device for realizing multi-transmitting coil full decoupling in wireless power transmission system | |
| CN110943544A (en) | Fractional order parallel-series electromagnetic field double-coupling wireless power transmission system | |
| CN211296333U (en) | Fractional order series connection type electromagnetic field double-coupling wireless power transmission system | |
| CN112886716B (en) | Integrated electromagnetic coupling mechanism and electric energy transmitting end, receiving end and transmission system thereof | |
| CN211296327U (en) | Fractional order parallel electromagnetic field double-coupling wireless power transmission system | |
| CN209844651U (en) | Three-phase excitation type capacitive wireless power transmission system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |