Resonant wireless power transmitting circuit

Abstract

The invention discloses a resonant wireless power supply transmitting circuit, which comprises a first digital potentiometer, a second operational amplifier, a third operational amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first capacitor and a first inductor, the other end of the first capacitor is connected with one end of a first inductor, the other end of the first inductor is connected with a tenth pin and an eleventh pin of a first digital potentiometer and an anti-phase end of a second operational amplifier, and a twelfth pin of the first digital potentiometer is connected with a positive electrode of a power supply; five pins of the first digital potentiometer are connected with one end of the first resistor and the output end of the second operational amplifier.

Description

Technical Field

[0001] The present invention relates to the field of wireless power transmission, and in particular to a resonant wireless power transmission circuit. Background Art

[0002] The principle of resonant wireless power transmission is to complete the transfer of electric energy through resonance. When the circuit at the transmitting end is working, the capacitor and inductor in the circuit generate a magnetic field, and the coil at the receiving end also generates an electromagnetic field after induction. In this way, the two coils are resonated to transmit electric energy. However, in actual practice, the ideal resonant frequency will be affected by various factors and shifted, which will reduce the efficiency of electric energy transmission. Therefore, a resonant wireless power transmission circuit that can detect the shift and automatically adjust it is proposed. Summary of the invention

[0003] In view of the above technical problems, the object of the present invention is to provide a resonant wireless power transmission circuit, including a first digital potentiometer U1, a second operational amplifier U2, a third operational amplifier U3, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a first capacitor C1, and a first inductor L1, wherein one end of the first capacitor C1 is connected to the negative electrode of the power supply, the other end of the first capacitor C1 is connected to one end of the first inductor L1, the other end of the first inductor L1 is connected to the tenth pin and the eleventh pin of the first digital potentiometer U1, and the inverting end of the second operational amplifier U2, and the twelveth pin of the first digital potentiometer U1 is connected to the positive electrode of the power supply. The first digital potentiometer U1 is connected to the first resistor R1, the fifth pin of the first digital potentiometer U1 is connected to one end of the first resistor R1 and the output end of the second operational amplifier U2, the third pin of the first digital potentiometer U1 is connected to one end of the second resistor R2, the in-phase end of the second operational amplifier U2 is connected to the output end of the third operational amplifier U3 and one end of the third resistor R3, the other end of the third resistor R3 is connected to the inverting end of the third operational amplifier U3 and one end of the fourth resistor R4, the in-phase end of the third operational amplifier U3 is connected to one end of the fifth resistor R5 and one end of the sixth resistor R6, the other end of the fifth resistor R5 is connected to the power supply, and the other ends of the first resistor R1, the second resistor R2 and the fourth resistor R4 are connected to the ground.

[0004] Furthermore, it also includes a fourth thyristor U4, a fifth thyristor U5, a sixth operational amplifier U6, a seventh operational amplifier U7, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a first diode D1, a second diode D2, a first transistor Q1, and a second transistor Q2, wherein the anode of the first diode D1 is connected to the anode of the second diode D2 and the output end of the second operational amplifier U2, the cathode of the first diode D1 is connected to the base of the first transistor Q1, the collector of the first transistor Q1 is connected to the power supply, the emitter of the first transistor Q1 is connected to the control electrode of the fourth thyristor U4 and one end of the seventh resistor R7, and the cathode of the fourth thyristor U4 is connected to the base of the first transistor Q1. The electrode is connected to one end of the eighth resistor R8 and the in-phase end of the sixth operational amplifier U6, the anode of the fourth thyristor U4 is connected to the anode of the fifth thyristor U5, the cathode of the fifth thyristor U5 is connected to the in-phase end of the seventh operational amplifier U7 and one end of the ninth resistor R9, the control electrode of the fifth thyristor U5 is connected to one end of the tenth resistor R10 and the collector of the second triode Q2, the emitter of the second triode Q2 is connected to one end of the eleventh resistor R11, the other end of the eleventh resistor R11 is connected to the power supply, the base of the second triode Q2 is connected to the cathode of the second diode D2 and one end of the twelfth resistor R12, the other end of the twelfth resistor R12, the other end of the tenth resistor R10, the other end of the seventh resistor R7, and the other end of the ninth resistor R9 are connected to the ground.

[0005] Furthermore, it also includes an eighth operational amplifier U8, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a third MOS tube D3, and a fourth diode D4. The output end of the sixth operational amplifier U6 is connected to one end of the thirteenth resistor R13 and the cathode of the third MOS tube D3. The anode of the third MOS tube D3 is connected to one end of the fourteenth resistor R14, one end of the fifteenth resistor R15, the anode of the fourth diode D4, and the in-phase end of the eighth operational amplifier U8. The cathode of the fourth diode D4 is connected to one end of the sixteenth resistor R16 and the output end of the seventh operational amplifier U7. The output end of the eighth operational amplifier U8 is connected to the three pins of the first digital potentiometer U1. The other end of the sixteenth resistor R16, the other end of the thirteenth resistor R13, and the other end of the fifteenth resistor R15 are connected to the ground end.

[0006] Furthermore, it also includes a seventeenth resistor R17 and a ninth voltage regulator U9, wherein the anode of the ninth voltage regulator U9 is connected to one end of the fifth resistor R5, the control electrode of the ninth voltage regulator U9 is connected to the other end of the sixth resistor R6 and one end of the seventeenth resistor R17, and the anode of the ninth voltage regulator U9 and the other end of the seventeenth resistor R17 are connected to the ground.

[0007] Furthermore, it also includes a third triode Q3, an eighteenth resistor R18, and a first connection terminal P1, the source of the third triode Q3 is connected to the anode of the fourth thyristor U4, the drain of the third triode Q3 is connected to the power supply, the gate of the third triode Q3 is connected to the first connection terminal P1 and one end of the eighteenth resistor R18, and the other end of the eighteenth resistor R18 is connected to the ground terminal.

[0008] Furthermore, it also includes a nineteenth resistor R19 and a twentieth resistor R20, wherein one end of the nineteenth resistor R19 is connected to the power supply, the other end of the nineteenth resistor R19 is connected to the inverting end of the eighth operational amplifier U8 and one end of the twentieth resistor R20, and the other end of the twentieth resistor R20 is connected to the ground end.

[0009] Furthermore, it also includes a twenty-first resistor R21 and a twenty-second resistor R22, one end of the twenty-first resistor R21 is connected to the power supply, the other end of the twenty-first resistor R21 is connected to the inverting end of the sixth operational amplifier U6, the inverting end of the seventh operational amplifier U7, and one end of the twenty-second resistor R22, and the other end of the twenty-second resistor R22 is connected to the ground end.

[0010] The beneficial effects of the present invention compared with the prior art are: The present invention can detect the frequency deviation of the resonance and adaptively adjust the gain of the resonance point under the deviation, so as to achieve the optimal power output. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the prior art and the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0012] Figure 1 This is a circuit structure diagram provided by the present invention. DETAILED DESCRIPTION

[0013] In order to make the objects and advantages of the present invention more clearly understood, the present invention is specifically described below in conjunction with embodiments. It should be understood that the following text is only used to describe one or several specific implementations of the present invention, and does not strictly limit the scope of protection specifically requested by the present invention.

[0014] The present invention discloses a resonant wireless power transmission circuit, comprising a first digital potentiometer U1, a second operational amplifier U2, a third operational amplifier U3, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a first capacitor C1, and a first inductor L1, wherein one end of the first capacitor C1 is connected to the negative electrode of the power supply, the other end of the first capacitor C1 is connected to one end of the first inductor L1, the other end of the first inductor L1 is connected to the tenth pin and the eleventh pin of the first digital potentiometer U1, and the inverting end of the second operational amplifier U2, the twelveth pin of the first digital potentiometer U1 is connected to the positive electrode of the power supply, and the first The five pins of the digital potentiometer U1 are connected to one end of the first resistor R1 and the output end of the second operational amplifier U2, the three pins of the first digital potentiometer U1 are connected to one end of the second resistor R2, the in-phase end of the second operational amplifier U2 is connected to the output end of the third operational amplifier U3 and one end of the third resistor R3, the other end of the third resistor R3 is connected to the inverting end of the third operational amplifier U3 and one end of the fourth resistor R4, the in-phase end of the third operational amplifier U3 is connected to one end of the fifth resistor R5 and one end of the sixth resistor R6, the other end of the fifth resistor R5 is connected to the power supply, and the other ends of the first resistor R1, the second resistor R2, and the fourth resistor R4 are connected to the ground.

[0015] Specifically, it also includes a fourth thyristor U4, a fifth thyristor U5, a sixth operational amplifier U6, a seventh operational amplifier U7, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a first diode D1, a second diode D2, a first transistor Q1, and a second transistor Q2, wherein the anode of the first diode D1 is connected to the anode of the second diode D2 and the output end of the second operational amplifier U2, the cathode of the first diode D1 is connected to the base of the first transistor Q1, the collector of the first transistor Q1 is connected to the power supply, the emitter of the first transistor Q1 is connected to the control electrode of the fourth thyristor U4 and one end of the seventh resistor R7, and the cathode of the fourth thyristor U4 is connected to the base of the first transistor Q1. The electrode is connected to one end of the eighth resistor R8 and the in-phase end of the sixth operational amplifier U6, the anode of the fourth thyristor U4 is connected to the anode of the fifth thyristor U5, the cathode of the fifth thyristor U5 is connected to the in-phase end of the seventh operational amplifier U7 and one end of the ninth resistor R9, the control electrode of the fifth thyristor U5 is connected to one end of the tenth resistor R10 and the collector of the second triode Q2, the emitter of the second triode Q2 is connected to one end of the eleventh resistor R11, the other end of the eleventh resistor R11 is connected to the power supply, the base of the second triode Q2 is connected to the cathode of the second diode D2 and one end of the twelfth resistor R12, the other end of the twelfth resistor R12, the other end of the tenth resistor R10, the other end of the seventh resistor R7, and the other end of the ninth resistor R9 are connected to the ground.

[0016] Specifically, it also includes an eighth operational amplifier U8, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a third MOS tube D3, and a fourth diode D4. The output end of the sixth operational amplifier U6 is connected to one end of the thirteenth resistor R13 and the cathode of the third MOS tube D3. The anode of the third MOS tube D3 is connected to one end of the fourteenth resistor R14, one end of the fifteenth resistor R15, the anode of the fourth diode D4, and the in-phase end of the eighth operational amplifier U8. The cathode of the fourth diode D4 is connected to one end of the sixteenth resistor R16 and the output end of the seventh operational amplifier U7. The output end of the eighth operational amplifier U8 is connected to the three pins of the first digital potentiometer U1. The other end of the sixteenth resistor R16, the other end of the thirteenth resistor R13, and the other end of the fifteenth resistor R15 are connected to the ground.

[0017] Specifically, it also includes a seventeenth resistor R17 and a ninth voltage regulator U9, wherein the anode of the ninth voltage regulator U9 is connected to one end of the fifth resistor R5, the control electrode of the ninth voltage regulator U9 is connected to the other end of the sixth resistor R6 and one end of the seventeenth resistor R17, and the anode of the ninth voltage regulator U9 and the other end of the seventeenth resistor R17 are connected to the ground.

[0018] Specifically, it also includes a third triode Q3, an eighteenth resistor R18, and a first connection terminal P1. The source of the third triode Q3 is connected to the anode of the fourth thyristor U4, the drain of the third triode Q3 is connected to the power supply, the gate of the third triode Q3 is connected to the first connection terminal P1 and one end of the eighteenth resistor R18, and the other end of the eighteenth resistor R18 is connected to the ground terminal.

[0019] Specifically, it also includes a nineteenth resistor R19 and a twentieth resistor R20, wherein one end of the nineteenth resistor R19 is connected to the power supply, the other end of the nineteenth resistor R19 is connected to the inverting end of the eighth operational amplifier U8 and one end of the twentieth resistor R20, and the other end of the twentieth resistor R20 is connected to the ground end.

[0020] Specifically, it also includes a twenty-first resistor R21 and a twenty-second resistor R22. One end of the twenty-first resistor R21 is connected to the power supply, the other end of the twenty-first resistor R21 is connected to the inverting end of the sixth operational amplifier U6, the inverting end of the seventh operational amplifier U7, and one end of the twenty-second resistor R22, and the other end of the twenty-second resistor R22 is connected to the ground end.

[0021] Considering that the process of reaching the resonance point during the resonance process may be affected by various factors and cause the resonance to shift, the resonance current is collected through the inverting end of the second operational amplifier U2 during the resonance process of the first digital potentiometer U1, the first inductor L1, and the first capacitor C1. In this embodiment, the other end of the sixth resistor R6 is directly connected to the ground end, and the fifth resistor R5 and the sixth resistor R6 divide the voltage to set the basic voltage of the third operational amplifier U3. The output signal of the third operational amplifier U3 is amplified by the third resistor R3 and the fourth resistor R4, and then the reference resonance current is output to the in-phase end of the second operational amplifier U2. When the resonance shifts, its current is less than the reference resonance current output by the third operational amplifier U3. The output signal of the second operational amplifier U2 is fed back to the three pins of the first digital potentiometer U1 through the first resistor R1, and the first digital potentiometer U1 is adjusted to change its resistance value. Otherwise, the second operational amplifier U2 has no output, so that the first digital potentiometer U1 is adjusted down, so that the first inductor L1 and the first capacitor C1 can output the maximum current to the resonance point through the first digital potentiometer U1 after the power supply is equivalent to a short circuit, thereby preventing the output power from being reduced.

[0022] Considering that when the adjustment reaches the resonance point, the first digital potentiometer U1 will always be in a self-adjusting state due to the uninterrupted operation of the second operational amplifier U2. In addition to using a high-precision digital potentiometer, there will still be a slight deviation. In order to avoid the cost of sampling high-precision components, on this basis, the output of the second operational amplifier U2 is fed back to the first diode D1 and the second diode D2 at the same time. If the resonant current in the initial state is less than the reference resonant maximum current, the output signal of the second operational amplifier U2 is fed back to the fourth thyristor U4 through the first diode D1 and the first transistor Q1. The fourth thyristor U4 is turned on, and the sixth operational amplifier U6 outputs At the same time, the output signal of the second operational amplifier U2 is also fed back to the second transistor Q2 through the second diode D2. The second transistor Q2 is turned off. After the resonant current is greater than the reference resonant current as adjusted by the first digital potentiometer U1, the second operational amplifier U2 is turned off. The power supply signal at the end of the eleventh resistor R11 is fed back to the fifth thyristor U5 through the collector of the second transistor Q2 after passing through the base of the second transistor Q2 and the twelfth resistor R12. The fifth thyristor U5 is turned on to make the seventh operational amplifier U7 output. When the sixth operational amplifier U6 and the seventh operational amplifier U7 are both in the output state, it means that there is no offset in the current resonance, and the first digital potentiometer is required. The potentiometer U1 is turned off, and the sixth operational amplifier U6 outputs to reverse bias the third MOS tube D3. When the seventh operational amplifier U7 outputs, the fourth diode D4 is reverse biased. When the sixth operational amplifier U6 and the seventh operational amplifier U7 both output, the midpoint voltage of the fourteenth resistor R14 and the fifteenth resistor R15 is pulled up to the reference voltage of the inverting terminal of the eighth operational amplifier U8. At this time, the eighth operational amplifier U8 is input to the first digital potentiometer U1, and the first digital potentiometer U1 is turned off. The sixth operational amplifier U6 and the seventh operational amplifier U7 jointly set the reference voltage through the twenty-first resistor R21 and the twenty-second resistor R22. The reference voltage of the operational amplifier U8 is jointly set through the nineteenth resistor R19 and the twentieth resistor R20. In addition, it can also be set directly through the power supply. The first connection terminal P1 is used to input a reset signal, which is a reset signal for re-adjusting the first digital potentiometer U1 after the adjustment is completed and it enters the cut-off state. The third transistor Q3 is connected in series to replace the direct connection between the anode of the fourth thyristor U4 and the power supply. The eighteenth resistor R18 is used for signal pull-down; the ninth voltage regulator U9 and the seventeenth resistor R17 are used to replace the fifth resistor R5 and the sixth resistor R6 to set the reference resonant current of the third operational amplifier U3 to prevent the signal from following the fluctuation when the power supply fluctuates.

[0023] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations within the meaning and scope of the equivalent elements of the claims be included in the invention. Any marking in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A resonant wireless power transmission circuit, characterized in that: The invention comprises a first digital potentiometer, a second operational amplifier, a third operational amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first capacitor and a first inductor, wherein one end of the first capacitor is connected to the negative electrode of a power supply, the other end of the first capacitor is connected to one end of the first inductor, the other end of the first inductor is connected to the tenth pin, the eleventh pin and the inverting end of the second operational amplifier of the first digital potentiometer, the twelveth pin of the first digital potentiometer is connected to the positive electrode of the power supply, the fiveth pin of the first digital potentiometer is connected to one end of the first resistor and the output end of the second operational amplifier, the threeth pin of the first digital potentiometer is connected to one end of the second resistor, the in-phase end of the second operational amplifier is connected to the output end of the third operational amplifier and one end of the third resistor, the other end of the third resistor is connected to the inverting end of the third operational amplifier and one end of the fourth resistor, the in-phase end of the third operational amplifier is connected to one end of the fifth resistor and one end of the sixth resistor, the other end of the fifth resistor is connected to the power supply, and the other ends of the first resistor, the second resistor and the fourth resistor are connected to the ground.

2. The resonant wireless power transmission circuit according to claim 1, characterized in that: The present invention also includes a fourth thyristor, a fifth thyristor, a sixth operational amplifier, a seventh operational amplifier, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a first diode, a second diode, a first triode, and a second triode, wherein the anode of the first diode is connected to the anode of the second diode and the output end of the second operational amplifier, the cathode of the first diode is connected to the base of the first triode, the collector of the first triode is connected to the power supply, the emitter of the first triode is connected to the control electrode of the fourth thyristor and one end of the seventh resistor, the cathode of the fourth thyristor is connected to the eighth diode The first operational amplifier is connected to the first transistor and the second operational amplifier is connected to the first resistor, the second operational amplifier is connected to the second transistor, the first operational amplifier is connected to the second transistor, the second operational amplifier is connected to the first resistor, the first operational amplifier is connected to the second transistor, the second operational amplifier is connected to the first resistor, the first operational amplifier is connected to the second transistor, the second operational amplifier is connected to the first resistor, the first operational amplifier is connected to the second transistor, the second operational amplifier is connected to the first resistor, the second operational amplifier is connected to the second transistor, the second operational amplifier is connected to the first resistor, the first operational amplifier is connected to the second transistor, the second operational amplifier is connected to the first resistor, the second operational amplifier is connected to the second transistor, the second operational amplifier is connected to the first resistor, the second operational amplifier is connected to the second transistor, the second operational amplifier is connected to the first resistor, the second operational amplifier is connected to the second operational amplifier ... operational amplifier, the second operational amplifier is connected to the first operational amplifier, the second operational amplifier is connected to the first operational amplifier, the second operational amplifier is connected to the first operational amplifier, the second operational amplifier is connected to the first operational amplifier, the second operational amplifier is connected to the first operational amplifier, the second operational amplifier is connected to the first operational amplifier, 3. The resonant wireless power transmission circuit according to claim 2, characterized in that: It also includes an eighth operational amplifier, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a third MOS tube, and a fourth diode. The output end of the sixth operational amplifier is connected to one end of the thirteenth resistor and the cathode of the third MOS tube. The anode of the third MOS tube is connected to one end of the fourteenth resistor, one end of the fifteenth resistor, the anode of the fourth diode, and the in-phase end of the eighth operational amplifier. The cathode of the fourth diode is connected to one end of the sixteenth resistor and the output end of the seventh operational amplifier. The output end of the eighth operational amplifier is connected to the three pins of the first digital potentiometer. The other end of the sixteenth resistor, the other end of the thirteenth resistor, and the other end of the fifteenth resistor are connected to the ground end.

4. The resonant wireless power transmission circuit according to claim 1, characterized in that: It also includes a seventeenth resistor and a ninth voltage regulator, wherein the ninth voltage regulator anode is connected to one end of the fifth resistor, the ninth voltage regulator control electrode is connected to the other end of the sixth resistor and one end of the seventeenth resistor, and the ninth voltage regulator anode and the other end of the seventeenth resistor are connected to the ground.

5. The resonant wireless power transmission circuit according to claim 2, characterized in that: It also includes a third triode, an eighteenth resistor, and a first connection end. The source of the third triode is connected to the anode of the fourth thyristor, the drain of the third triode is connected to the power supply, the gate of the third triode is connected to the first connection end and one end of the eighteenth resistor, and the other end of the eighteenth resistor is connected to the ground end.

6. The resonant wireless power transmission circuit according to claim 3, characterized in that: It also includes a nineteenth resistor and a twentieth resistor, wherein one end of the nineteenth resistor is connected to the power supply, the other end of the nineteenth resistor is connected to the inverting end of the eighth operational amplifier and one end of the twentieth resistor, and the other end of the twentieth resistor is connected to the ground end.

7. The resonant wireless power transmission circuit according to claim 2, characterized in that: It also includes a twenty-first resistor and a twenty-second resistor, one end of the twenty-first resistor is connected to the power supply, the other end of the twenty-first resistor is connected to the inverting end of the sixth operational amplifier, the inverting end of the seventh operational amplifier, and one end of the twenty-second resistor, and the other end of the twenty-second resistor is connected to the ground end.

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