CN215071824U - Constant-voltage constant-current multi-relay wireless power transmission system based on primary side current detection - Google Patents
Constant-voltage constant-current multi-relay wireless power transmission system based on primary side current detection Download PDFInfo
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- CN215071824U CN215071824U CN202121490686.9U CN202121490686U CN215071824U CN 215071824 U CN215071824 U CN 215071824U CN 202121490686 U CN202121490686 U CN 202121490686U CN 215071824 U CN215071824 U CN 215071824U
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Abstract
The utility model relates to a wireless power transmission technical field specifically discloses a many relays of constant voltage constant current wireless power transmission system based on primary side current detection, uses current detection circuit to gather current signal and change into corresponding voltage signal at primary side transmitting terminal, compensates this voltage signal through filtering phase correction circuit, adopts zero cross comparison circuit to produce square wave signal as the drive signal of dc-to-ac converter for the output voltage and the output current of the high frequency inverter of primary side transmitting terminal are in phase. The high-frequency inverter and the compensation circuit can be used as a negative resistance element of a wireless power transmission system, and therefore the high-frequency inverter-based space-time symmetric wireless power transmission system can be achieved. The primary side transmitting end, the multi-relay circuit and the secondary side receiving end all adopt S-shaped topologies, and a high-frequency inverter and current detection following of the secondary side receiving end are used, so that the system has constant voltage output under the condition of certain load change.
Description
Technical Field
The utility model relates to a wireless power transmission technical field especially relates to a many relays of constant voltage constant current wireless power transmission system based on primary side current detection.
Background
The relay coil can be used for remarkably increasing the transmission distance of the wireless power transmission system, and is widely applied to special fields of high-voltage power taking and the like. The wireless power transmission system with the multi-relay mode uses a transmitting end and a receiving end, and a closed passive coil is used between the transmitting end and the receiving end for relaying energy transmission, so that the transmission distance of the wireless power transmission system can be far longer than that of a wireless power transmission system with a two-coil structure.
At present, due to the fact that cross coupling exists between non-adjacent coils of a wireless power transmission system in a multi-relay mode, the resonant frequency of the system is deviated, and the output characteristic analysis of the system is more complex compared with a two-coil structure. For example, the two-coil system can ensure that the receiving end outputs a constant voltage by using an LCC-S structure, and the receiving end outputs a constant current by using a double-side LCC structure, but the multi-relay energy transfer system cannot ensure the characteristics of the constant voltage output and the constant current output of the system by using the LCC-S- … -S and LCC-S- … -S-LCC structures due to the existence of cross coupling referring to the circuit topology. Therefore, according to the prior art, for a multi-relay energy transfer system with cross coupling, the constant voltage and constant current characteristics of the system are generally ensured by using transmitting end DC-DC regulation, phase shift control or receiving end DC-DC regulation, so that the series number and the original secondary side communication link of a converter in a circuit are increased, and the integral loss of the system is increased and the design is more complicated.
SUMMERY OF THE UTILITY MODEL
The utility model provides a many relays of constant voltage constant current wireless power transmission system based on primary side current detection, the technical problem of solution lies in: how to output the constant voltage and the constant current at a secondary receiving end of a multi-relay wireless power transmission system.
In order to solve the technical problem, the utility model provides a constant voltage constant current many relays wireless power transmission system based on primary side current detection, including primary side transmitting terminal, many relay circuit and vice limit receiving terminal, the primary side transmitting terminal is equipped with transmitting coil, many relay circuit are equipped with more than one relay coil; the secondary side receiving end is provided with a receiving coil coupled with the last stage relay coil; the system is also provided with a compensation circuit;
the compensation circuit comprises a current detection circuit, a filtering phase correction circuit and a zero-crossing comparison circuit which are sequentially connected;
the current detection circuit comprises a current transformer, a current converter and a voltage stabilizer which are connected in sequence; the current transformer is connected with the transmitting coil, detects a current signal flowing through the transmitting coil and transmits the current signal to the current converter; the current converter converts an inflow current signal into a voltage signal and transmits the voltage signal to the voltage stabilizer, and the voltage stabilizer clamps the voltage signal under a specific voltage value;
the filtering phase correction circuit comprises a filter and a phase lead corrector which are connected; the filter is connected with the voltage stabilizer to filter high-frequency switching noise of a voltage signal clamped by the voltage stabilizer and input the high-frequency switching noise to the phase lead corrector; the phase lead corrector performs phase compensation on the filtered voltage signal to enable the phase compensation to be in phase with a current signal flowing through the transmitting coil;
the zero-crossing comparison circuit comprises a zero-crossing comparator and a square wave generator which are connected; the zero-crossing comparator is connected with the phase lead corrector to compare the voltage signal after phase correction with 0V, if the voltage signal is greater than 0V, a high level is output to the square wave generator, and if the voltage signal is less than 0V, a low level is output to the square wave generator; the square wave generator outputs a +3.3V voltage signal when receiving a high level signal, and outputs a 0V voltage signal when receiving a low level signal, so that a continuous-time square wave signal is obtained and is input to the high-frequency inverter at the primary side transmitting end.
Preferably, the current converter employs a first resistor.
Preferably, the voltage stabilizer comprises a first voltage-stabilizing tube and a second voltage-stabilizing tube, the positive end of the first voltage-stabilizing tube is connected with the positive end of the second voltage-stabilizing tube, the negative end of the first voltage-stabilizing tube is connected with the common end of the first resistor and the filter, and the negative end of the second voltage-stabilizing tube is grounded.
Preferably, the filter employs a voltage follower.
Preferably, the phase lead corrector comprises a first capacitor, a second capacitor and a second resistor; the first capacitor is connected between the output end of the voltage follower and the input end of the zero-crossing comparator; the second capacitor is connected in parallel with the first capacitor; one end of the second resistor is connected with the input end of the zero-crossing comparator, and the other end of the second resistor is grounded.
Preferably, the zero-crossing comparator adopts a voltage comparator LM311 DT.
Preferably, the square wave generator comprises an MOS transistor, a diode, a third voltage regulator, a fourth voltage regulator, a third resistor, and a fourth resistor; the grid electrode of the MOS tube is connected with the output end of the voltage comparator, the source electrode of the MOS tube is connected with one end of the third resistor, and the drain electrode of the MOS tube is connected with a +15V power supply; the diode is reversely connected between the drain electrode and the source electrode of the MOS tube; one end of the fourth resistor is connected with the other end of the third resistor, and the other end of the fourth resistor is grounded; the negative end of the third voltage-stabilizing tube is connected with a +3.3V power supply, and the positive end of the third voltage-stabilizing tube is connected with the negative end of the fourth voltage-stabilizing tube; the positive end of the fourth voltage-regulator tube is grounded; the common end of the third voltage-regulator tube and the common end of the fourth voltage-regulator tube are connected with the common end of the third resistor and the common end of the fourth resistor are connected with the high-frequency inverter so as to output two paths of complementary driving signals to drive the high-frequency inverter.
Preferably, the current transformer adopts LA55-P/SP 50.
Preferably, the primary side transmitting end, the multi-relay circuit and the secondary side receiving end all adopt S-type topologies.
Preferably, the transmitting coil, more than 1 relay coil and the receiving coil are arranged at equal intervals.
The utility model provides a pair of many relays of constant voltage constant current wireless power transmission system based on primary side current detection uses current detection circuit to gather current signal and change into corresponding voltage signal at primary side transmitting terminal, compensates this voltage signal through filtering phase correction circuit, adopts zero cross comparison circuit to produce square wave signal as the drive signal of the high frequency inverter of primary side transmitting terminal for the output voltage and the output current of dc-to-ac converter are in phase. The high-frequency inverter and the compensation circuit can be used as a negative resistance element of a wireless power transmission system, and therefore the high-frequency inverter-based space-time symmetric wireless power transmission system can be achieved. The primary side transmitting end, the multi-relay circuit and the secondary side receiving end all adopt S-shaped topologies, and a high-frequency inverter and current detection following of the primary side transmitting end are used, so that the system has constant voltage and current output under the condition of certain load change.
Drawings
Fig. 1 is a topological diagram of a constant-voltage constant-current multi-relay wireless power transmission system based on primary side current detection provided by an embodiment of the present invention;
fig. 2 is a circuit topology diagram of a compensation circuit provided by an embodiment of the present invention;
fig. 3 is a position relationship diagram of a system coupling mechanism provided by the embodiment of the present invention;
fig. 4 is a waveform diagram of output voltage and current of the system varying with load according to the embodiment of the present invention.
Detailed Description
The following embodiments of the present invention will be described in detail with reference to the accompanying drawings, which are given for illustrative purposes only and are not to be construed as limiting the invention, including the drawings, which are only used for reference and illustration, and do not constitute a limitation to the scope of the invention, since many changes may be made thereto without departing from the spirit and scope of the invention.
In order to enable the secondary receiving end not to be affected by the load size and output the constant voltage, the embodiment of the utility model provides a constant voltage constant current multi-relay wireless power transmission system based on primary current detection, the circuit topology of which is shown in figure 1 and comprises a primary transmitting end, a multi-relay circuit and a secondary receiving end, the primary transmitting end is provided with a transmitting coil, and the multi-relay circuit comprises at least one relay coil; and the secondary side receiving end is provided with a receiving coil coupled with the last stage of relay coil. This example is described by taking as an example a double relay circuit including a first relay coil coupled to a transmitting coil and a second relay coil coupled to the first relay coil.
In FIG. 1, L1And L4Self-inductance of the transmitting coil and the receiving coil respectively; l is2And L3Self-inductance of two relay coils respectively; c1、C2、C3、C4Are respectively a coil L1、L2、L3、L4The resonant capacitance (using an S-type topology); mijIs a coil LiAnd LjMutual inductance between (where i ═ 1,2,3, 4; j ═ 1,2,3, 4); r1、R2、R3、R4Are respectively a coil L1、L2、L3、L4Internal resistance of (d); i is1、I2、I3、I4Respectively a current-flowing coil L1、L2、L3、L4The current of (a); vin、VinvAnd VoutRespectively, a system input voltage, a high frequency inverter output voltage and a load output voltage. The receiving end is also provided with a rectifying and filtering circuit which consists of four diodes and a filtering capacitor CLComposition RLRepresenting load resistance, corresponding toLRepresenting a loadThe current also represents the output current at the secondary side receiver. MOS tube Q1、Q2、Q3、Q4And the high-frequency inverter forms a primary side transmitting end.
The system is also provided with a compensation circuit, as shown in fig. 1, the compensation circuit comprises a current detection circuit, a filtering phase correction circuit and a zero-crossing comparison circuit which are connected in sequence.
The current detection circuit comprises a current transformer, a current converter and a voltage stabilizer which are connected in sequence; the current transformer is connected with the transmitting coil, detects a current signal flowing through the transmitting coil and transmits the current signal to the current converter; the current converter converts the current signal into a voltage signal and transmits the voltage signal to the voltage stabilizer, and the voltage stabilizer clamps the voltage signal under a specific voltage value.
The filtering phase correction circuit comprises a filter and a phase lead corrector which are connected; the filter is connected with the voltage stabilizer to filter the high-frequency switching noise of the voltage signal clamped by the voltage stabilizer and input the high-frequency switching noise to the phase lead corrector; the phase lead corrector performs phase compensation on the filtered voltage signal so that the phase of the filtered voltage signal is in phase with a current signal flowing through the transmitting coil.
The zero-crossing comparison circuit comprises a zero-crossing comparator and a square wave generator which are connected; the zero crossing comparator is connected with the phase lead corrector to compare the voltage signal after phase correction with 0V, if the voltage signal is greater than 0V, a high level is output to the square wave generator, and if the voltage signal is less than 0V, a low level is output to the square wave generator; the square wave generator outputs a +3.3V voltage signal when receiving a high level signal, and outputs a 0V voltage signal when receiving a low level signal, so that two paths of complementary square waves which have the same phase and have a 180-degree difference with the primary transmitting end are generated to drive the high-frequency inverter of the primary transmitting end to work.
As shown in fig. 2:
the current transformer adopts LA55-P/SP 50. The current converter adopts a first resistor R1。
The voltage stabilizer comprises a first voltage regulator tube DZ1And a second voltage regulator tube DZ2The first voltage regulator tube DZ1The positive terminal of the first voltage regulator tube is connected with a second voltage regulator tube DZ2The positive terminal of (1), the first voltage regulator tube DZ1Of the negative electrodeEnd connected with a first resistor R1And the common terminal of the filter, a second voltage regulator DZ2The negative terminal of which is grounded.
The filter uses a voltage follower (U4 and its accompanying circuitry). The zero-crossing comparator adopts a voltage comparator LM311DT (U6 and the accessory circuits thereof).
The phase lead corrector comprises a first capacitor C7A second capacitor C8And a second resistor R6(ii) a A first capacitor C7The zero-crossing comparator is connected between the output end of the voltage follower and the input end of the zero-crossing comparator; second capacitor C8And a first capacitor C7Are connected in parallel; a second resistor R6One end is connected with the input end of the zero-crossing comparator, and the other end is grounded.
The square wave generator comprises an MOS tube Q5Diode D1And a third voltage regulator tube DZ3And a fourth voltage regulator tube DZ4A third resistor R9And a fourth resistor R10(ii) a MOS tube Q5The grid (G) of the first resistor is connected with the output end of the voltage comparator, and the source (S) of the first resistor is connected with the third resistor R9The drain electrode (D) is connected with a +15V power supply; diode D1Reversely connected to MOS transistor Q5Between the drain and source of (a); a fourth resistor R10One end of which is connected with a third resistor R9The other end of (1), a fourth resistor R10The other end of the first and second electrodes is grounded; third voltage regulator tube DZ3The negative end of the positive electrode is connected with a +3.3V power supply, and the positive end of the positive electrode is connected with a fourth voltage-stabilizing tube DZ4The negative terminal of (1); fourth voltage regulator tube DZ4The positive terminal of the anode is grounded; third voltage regulator tube DZ3And a fourth voltage regulator tube DZ4Is connected with a third resistor R9And a fourth resistor R10Is connected with the high-frequency inverter. The corrected voltage signal passes through the LM311DT voltage comparator, and when the IN + voltage is greater than the input 0V of the IN pin, the high level is output to drive the MOS tube Q5Is conducted at the third resistor R9And a fourth resistor R10The middle voltage signal is +3.3V, and when the input voltage of IN + pin is less than 0V, the MOS transistor Q5In the off state, the third resistor R9And a fourth resistor R10The voltage signal is taken out in the middle to be 0V, and finally the square wave signal with the positive amplitude of +3.3V is obtained for realizingAnd providing reference for constant voltage control of the output voltage of the secondary receiving end and system voltage gain control. During system operation, the output voltage and the output current of the inverter are always in the same phase, and the inverter model can be regarded as a negative resistance at the moment, namely
RNIs a negative real number.
According to kirchhoff's voltage and current laws, the method can be obtained
Wherein
The system coupling mechanism is designed as shown in fig. 3, and comprises a transmitting coil, a first relay coil, a second relay coil and a receiving coil from left to right, wherein the distance between two adjacent coils is 8 cm. The four coils are all the same size and number of turns: the outer diameter is 20cm and the inner diameter is 10 cm.
And (3) constructing a Simulink simulation model, and bringing the system parameters in the table 1 into the system.
TABLE 1 System Circuit parameters
| Parameter(s) | Parameter value |
| Coil self-inductance | L1＝…＝L4＝L＝60μH |
| Coil mutual inductance 1 | M12＝M23＝M34＝10.5μH |
| Coil mutual inductance 2 | M13＝M24＝2.9μH |
| Coil mutual inductance 3 | M14＝1.05μH |
| Resonance capacitance (nF) | C1＝…＝C4＝C＝10.55nF |
| Input voltage (V) | 24V |
| Resonant frequency of circuit | ω0＝200kHZ |
The working mode of the system is self-oscillation, the system is a high-order nonlinear system, and a plurality of stable autonomous oscillation frequency points exist in the system. As shown in fig. 4, in a range from a small load to a large load, the system is branched, and the constant voltage characteristic appears first in the output characteristic and then the constant current characteristic appears.
The embodiment of the utility model provides a pair of many relays of constant voltage constant current wireless power transmission system based on primary side current detection uses current detection circuit to gather current signal and change into corresponding voltage signal at the primary side transmitting terminal, compensates this voltage signal through filtering phase correction circuit, adopts zero cross comparison circuit to produce square wave signal as the drive signal of the high frequency inverter of primary side transmitting terminal for the output voltage and the output current of dc-to-ac converter are in phase. The high-frequency inverter and the compensation circuit can be used as a negative resistance element of a wireless power transmission system, and therefore the high-frequency inverter-based space-time symmetric wireless power transmission system can be achieved. The primary side transmitting end, the multi-relay circuit and the secondary side receiving end all adopt S-shaped topologies, and a high-frequency inverter and current detection following of the primary side transmitting end are used, so that the system has constant voltage and current output under the condition of certain load change.
The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be equivalent replacement modes, and all are included in the scope of the present invention.
Claims (10)
1. The constant-voltage constant-current multi-relay wireless power transmission system based on primary side current detection comprises a primary side transmitting end, a multi-relay circuit and a secondary side receiving end, wherein the primary side transmitting end is provided with a transmitting coil, and the multi-relay circuit is provided with more than one relay coil; the secondary side receiving end is provided with a receiving coil coupled with the last stage relay coil; the method is characterized in that: the system is also provided with a compensation circuit;
the compensation circuit comprises a current detection circuit, a filtering phase correction circuit and a zero-crossing comparison circuit which are sequentially connected;
the current detection circuit comprises a current transformer, a current converter and a voltage stabilizer which are connected in sequence; the current transformer is connected with the transmitting coil, detects a current signal flowing through the transmitting coil and transmits the current signal to the current converter; the current converter converts an inflow current signal into a voltage signal and transmits the voltage signal to the voltage stabilizer, and the voltage stabilizer clamps the voltage signal under a specific voltage value;
the filtering phase correction circuit comprises a filter and a phase lead corrector which are connected; the filter is connected with the voltage stabilizer to filter high-frequency switching noise of a voltage signal clamped by the voltage stabilizer and input the high-frequency switching noise to the phase lead corrector; the phase lead corrector performs phase compensation on the filtered voltage signal to enable the phase compensation to be in phase with a current signal flowing through the transmitting coil;
the zero-crossing comparison circuit comprises a zero-crossing comparator and a square wave generator which are connected; the zero-crossing comparator is connected with the phase lead corrector to compare the voltage signal after phase correction with 0V, if the voltage signal is greater than 0V, a high level is output to the square wave generator, and if the voltage signal is less than 0V, a low level is output to the square wave generator; the square wave generator outputs a +3.3V voltage signal when receiving a high level signal, and outputs a 0V voltage signal when receiving a low level signal, so that two paths of complementary square waves which have the same phase and 180-degree difference with the primary side transmitting end are generated to drive the high-frequency inverter of the primary side transmitting end to work.
2. The constant-voltage constant-current multi-relay wireless power transmission system based on primary side current detection as claimed in claim 1, wherein: the current converter employs a first resistor.
3. The constant-voltage constant-current multi-relay wireless power transmission system based on primary side current detection as claimed in claim 2, wherein: the voltage stabilizer comprises a first voltage-stabilizing tube and a second voltage-stabilizing tube, wherein the positive end of the first voltage-stabilizing tube is connected with the positive end of the second voltage-stabilizing tube, the negative end of the first voltage-stabilizing tube is connected with the common end of the first resistor and the filter, and the negative end of the second voltage-stabilizing tube is grounded.
4. The constant-voltage constant-current multi-relay wireless power transmission system based on primary side current detection is characterized in that: the filter adopts a voltage follower.
5. The constant-voltage constant-current multi-relay wireless power transmission system based on primary side current detection is characterized in that: the phase lead corrector comprises a first capacitor, a second capacitor and a second resistor; the first capacitor is connected between the output end of the voltage follower and the input end of the zero-crossing comparator; the second capacitor is connected in parallel with the first capacitor; one end of the second resistor is connected with the input end of the zero-crossing comparator, and the other end of the second resistor is grounded.
6. The constant-voltage constant-current multi-relay wireless power transmission system based on primary side current detection is characterized in that: the zero-crossing comparator adopts a voltage comparator LM311 DT.
7. The constant-voltage constant-current multi-relay wireless power transmission system based on primary side current detection as claimed in claim 6, wherein: the square wave generator comprises an MOS (metal oxide semiconductor) tube, a diode, a third voltage regulator tube, a fourth voltage regulator tube, a third resistor and a fourth resistor; the grid electrode of the MOS tube is connected with the output end of the voltage comparator, the source electrode of the MOS tube is connected with one end of the third resistor, and the drain electrode of the MOS tube is connected with a +15V power supply; the diode is reversely connected between the drain electrode and the source electrode of the MOS tube; one end of the fourth resistor is connected with the other end of the third resistor, and the other end of the fourth resistor is grounded; the negative end of the third voltage-stabilizing tube is connected with a +3.3V power supply, and the positive end of the third voltage-stabilizing tube is connected with the negative end of the fourth voltage-stabilizing tube; the positive end of the fourth voltage-regulator tube is grounded; the common end of the third voltage-regulator tube and the common end of the fourth voltage-regulator tube are connected with the common end of the third resistor and the common end of the fourth resistor are connected with the high-frequency inverter so as to output two paths of complementary driving signals to drive the high-frequency inverter.
8. The constant-voltage constant-current multi-relay wireless power transmission system based on primary side current detection as claimed in any one of claims 1 to 7, wherein: the current transformer adopts LA55-P/SP 50.
9. The constant-voltage constant-current multi-relay wireless power transmission system based on primary side current detection as claimed in any one of claims 1 to 7, wherein: the primary side transmitting end, the multi-relay circuit and the secondary side receiving end all adopt S-type topologies.
10. The constant-voltage constant-current multi-relay wireless power transmission system based on primary side current detection as claimed in any one of claims 1 to 7, wherein: the transmitting coil, more than 1 relay coil and the receiving coil are arranged at equal intervals.
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| CN202121490686.9U CN215071824U (en) | 2021-06-30 | 2021-06-30 | Constant-voltage constant-current multi-relay wireless power transmission system based on primary side current detection |
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| CN202121490686.9U CN215071824U (en) | 2021-06-30 | 2021-06-30 | Constant-voltage constant-current multi-relay wireless power transmission system based on primary side current detection |
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