Electronic wallet circuit and electronic wallet

Abstract

The application is suitable for the technical field of electronic wallet, and particularly relates to an electronic wallet circuit and an electronic wallet, wherein the electronic wallet circuit comprises an NFC antenna, an electronic wallet chip, a battery, a switching-on and switching-off circuit, a button circuit, a main control circuit and a display screen; the electronic wallet chip feeds back transaction data to the main control circuit after transaction with a card reading terminal through the NFC antenna; the main control circuit is powered by the battery and displays the transaction data through the display screen, so that the display through the card reading terminal is not needed, the safety is improved, the operation is simple, and the user experience is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of electronic wallets, and in particular relates to an electronic wallet circuit and an electronic wallet. Background Art

[0002] Existing NFC electronic wallets usually do not have peripherals such as display screens. They need to draw power from the card reader terminal through the NFC antenna and communicate with the card reader terminal, and then display information on the card reader terminal, such as obtaining the wallet balance. They have low security, complex operation, and poor user experience. Summary of the Invention

[0003] The purpose of the present invention is to provide an electronic wallet circuit, aiming to solve the problem that traditional electronic wallets display information through card reading terminals, resulting in low security and complex operations.

[0004] A first aspect of an embodiment of the present invention provides an electronic wallet circuit, which includes an NFC antenna, an electronic wallet chip, a battery, a power on / off circuit, a key circuit, a main control circuit, and a display screen.

[0005] The power on / off circuit is electrically connected to the battery, the main control circuit, and the key circuit respectively; the electronic wallet chip is electrically connected to the NFC antenna and the main control circuit respectively; and the main control circuit is also electrically connected to the display screen;

[0006] The button circuit is used to output a power on / off signal to the power on / off circuit according to a trigger operation by a user;

[0007] The battery is used to output a first DC power supply to the switch circuit;

[0008] The on / off circuit is configured to turn on and transmit the first DC power to the main control circuit according to the on / off signal, or to turn off and stop outputting the first DC power to the main control circuit according to the on / off signal;

[0009] The electronic wallet chip is used to connect to the card reader terminal through the NFC antenna, power on and perform data exchange, and output transaction data to the main control circuit;

[0010] The main control circuit is configured to start up upon receiving the first DC power supply and control the display screen to display the transaction data.

[0011] In one embodiment, the electronic wallet circuit further includes a first switching circuit and a power conversion circuit;

[0012] The power input terminal of the first switching circuit is connected to the power terminal of the battery, the power input terminal of the power conversion circuit is connected to the NFC antenna, the power output terminal of the first switching circuit, the power output terminal of the power conversion circuit, and the power input terminal of the switch circuit are interconnected, and the control terminal of the power conversion circuit is connected to the controlled terminal of the first switching circuit;

[0013] The power conversion circuit is used for:

[0014] receiving an AC power source output by the NFC antenna and converting the AC power source into a second DC power source;

[0015] When the voltage of the second DC power supply is greater than the voltage output by the battery, the first switch circuit is controlled to be turned off, and the second DC power supply is output to the switch circuit;

[0016] When the voltage of the second DC power supply is lower than the voltage output by the battery, the first switch circuit is controlled to be turned on, and the output of the second DC power supply to the switch circuit is cut off.

[0017] In one embodiment, the power conversion circuit is further connected to the main control circuit;

[0018] The power conversion circuit is further configured to send an NFC power-on signal to the main control circuit when the electronic wallet chip is connected to a card reader terminal via the NFC antenna.

[0019] In one embodiment, the electronic wallet circuit further includes a second switch circuit;

[0020] The power input terminal of the second switch circuit is connected to the power output terminal of the switch circuit, and the power output terminal of the second switch circuit is connected to the power terminal of the electronic wallet chip;

[0021] The main control circuit is further configured to control the second switch circuit to be turned on when the NFC power-on signal is received, and to control the second switch circuit to be turned off when the NFC power-on signal is not received.

[0022] In one embodiment, the electronic wallet circuit further includes a bank card chip and a radio frequency switch;

[0023] The radio frequency switch is electrically connected to the bank card chip, the NFC antenna and the electronic wallet chip respectively;

[0024] The main control circuit is configured to output a first control signal to the radio frequency switch when a power-on signal from the battery is received, and output a second control signal to the radio frequency switch when no power-on signal from the battery is received;

[0025] The radio frequency switch is configured to connect the electronic wallet chip and the NFC antenna when receiving the first control signal, so that the electronic wallet chip interacts with the card reader terminal signal through the NFC antenna;

[0026] When the second control signal is received, the bank card chip and the NFC antenna are connected so that the bank card chip interacts with the card reading terminal signal through the NFC antenna.

[0027] In one embodiment, the electronic wallet circuit further includes a key switch, and the key switch is electrically connected to the main control circuit;

[0028] The main control circuit is further used to control the display screen to switch the display interface according to the key trigger signal output by the key switch.

[0029] In one embodiment, the power conversion circuit includes a rectifier voltage regulator circuit and an LDO voltage regulator circuit;

[0030] The power input terminal of the rectifier and voltage-stabilizing circuit is connected to the NFC antenna, the power output terminal of the rectifier and voltage-stabilizing circuit is connected to the power input terminal of the LDO voltage-stabilizing circuit, the power output terminal of the LDO voltage-stabilizing circuit is connected to the power input terminal of the switch circuit, and the LDO voltage-stabilizing circuit is also electrically connected to the first switch circuit and the main control circuit respectively;

[0031] The rectifier and voltage stabilization circuit is configured to rectify and convert the AC power output by the NFC antenna and output a first DC voltage to the LDO voltage stabilization circuit;

[0032] The LDO voltage stabilizing circuit is configured to convert the first DC voltage into a second DC voltage and output the second DC voltage to the main control circuit, the power on / off circuit, and the first switch circuit;

[0033] The first switch circuit is a transistor.

[0034] In one embodiment, the rectifier and voltage-stabilizing circuit includes a rectifier bridge and a voltage-stabilizing diode, and the voltage-stabilizing diode is connected in reverse parallel to the output end of the rectifier bridge.

[0035] In one embodiment, the switch circuit includes a first resistor, a second resistor, a third resistor, a first capacitor, a first diode, a first electronic switch tube, and a second electronic switch tube;

[0036] The first end of the first capacitor, the signal end of the key circuit, the first end of the first resistor and the cathode of the first diode are interconnected; the second end of the first capacitor, the first end of the second resistor, the second end of the first resistor, the gate of the first electronic switch tube and the drain of the second electronic switch tube are interconnected; the source of the first electronic switch tube and the second end of the second resistor are connected together to form the power input end of the switch circuit; the drain of the first electronic switch tube is the power input end of the switch circuit; the gate of the second electronic switch tube, the first end of the third resistor and the anode of the first diode are respectively connected to the signal end of the main control circuit; the second end of the third resistor is connected to the source of the second electronic switch tube.

[0037] A second aspect of an embodiment of the present invention provides an electronic wallet, which includes the electronic wallet circuit described above.

[0038] The embodiment of the present invention comprises an electronic wallet circuit using an NFC antenna, an electronic wallet chip, a battery, a power on / off circuit, a button circuit, a main control circuit and a display screen. The electronic wallet chip feeds back transaction data to the main control circuit after a transaction with a card reader terminal via the NFC antenna. The main control circuit is powered by a battery and displays the transaction data on the display screen without the need for display via a card reader terminal. This improves security, simplifies operation and enhances the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 A schematic diagram of the first structure of an electronic wallet circuit provided by an embodiment of the present invention;

[0040] Figure 2 A second structural diagram of the electronic wallet circuit provided by an embodiment of the present invention;

[0041] Figure 3 A third structural diagram of the electronic wallet circuit provided in an embodiment of the present invention;

[0042] Figure 4 A fourth structural diagram of the electronic wallet circuit provided in an embodiment of the present invention;

[0043] Figure 5 A fifth structural diagram of the electronic wallet circuit provided in an embodiment of the present invention;

[0044] Figure 6 A sixth structural diagram of an electronic wallet circuit provided by an embodiment of the present invention;

[0045] Figure 7 A seventh structural diagram of the electronic wallet circuit provided by an embodiment of the present invention;

[0046] Figure 8A schematic structural diagram of a rectifier and voltage-stabilizing circuit provided in an embodiment of the present invention;

[0047] Figure 9 A schematic diagram of the structure of a power on / off circuit provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0048] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0049] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0050] A first aspect of an embodiment of the present invention provides an electronic wallet circuit.

[0051] like Figure 1 As shown, Figure 1 This is a schematic diagram of a first structural embodiment of an electronic wallet circuit provided in an embodiment of the present invention. In this embodiment, the electronic wallet circuit includes an NFC antenna 10, an electronic wallet chip 20, a battery 30, a power on / off circuit 40, a key circuit 50, a main control circuit 60, and a display screen 70.

[0052] The power on / off circuit 40 is electrically connected to the battery 30 , the main control circuit 60 , and the key circuit 50 . The electronic wallet chip 20 is electrically connected to the NFC antenna 10 and the main control circuit 60 . The main control circuit 60 is also electrically connected to the display screen 70 .

[0053] The button circuit 50 is used to output a power on / off signal to the power on / off circuit 40 according to a user's trigger operation;

[0054] The battery 30 is used to output a first DC power supply to the power on / off circuit 40;

[0055] The on / off circuit 40 is configured to turn on and transmit the first DC power to the main control circuit 60 according to the on / off signal, or to turn off and stop outputting the first DC power to the main control circuit 60 according to the on / off signal;

[0056] The electronic wallet chip 20 is used to connect to the card reader terminal through the NFC antenna 10 to power on and perform data exchange, and output transaction data to the main control circuit 60;

[0057] The main control circuit 60 is configured to start up when receiving the first DC power supply and control the display screen 70 to display transaction data.

[0058] In this embodiment, the NFC antenna 10 wirelessly communicates with a card reader terminal. When the card reader terminal is in proximity, it communicates with the NFC antenna 10 and provides operating power to the electronic wallet chip 20, thereby powering up the electronic wallet chip 20. The electronic wallet chip 20 then exchanges data with the card reader terminal, such as for financial transactions and data queries. After the transaction is completed, the electronic wallet chip 20 feeds back transaction data to the main control circuit 60. The battery 30 provides operating power to the main control circuit 60 via the power-on / off circuit 40. When the power-on / off circuit 40 is turned on and conducted under the control of the key circuit 50, it outputs operating power to the main control circuit 60. The main control circuit 60 receives the transaction data fed back by the electronic wallet chip 20 and controls the display screen 70 for data display. When the NFC antenna 10 is not in proximity to the card reader terminal, the user can still activate the main control circuit 60 and the display screen 70 using the key circuit 50, thereby obtaining data in the electronic wallet chip 20 without having to access the card reader terminal. This improves the convenience of data acquisition and the user experience.

[0059] The main control circuit 60 can be a processor such as MCU, CPU, etc., the key circuit 50 can be a touch key, mechanical key, etc., the display screen 70 can be a digital display screen 70, or a broken-code electronic paper, the power on / off circuit 40 can be a switching device or a switch combination circuit with a controlled function, and the battery 30 can be a lithium battery 30, such as a button battery 30, and the specific structure is not limited.

[0060] like Figure 2 As shown, in one embodiment, the electronic wallet circuit further includes a key switch 130, and the key switch 130 is electrically connected to the main control circuit 60;

[0061] The main control circuit 60 is further configured to control the display screen 70 to switch the display interface according to the key trigger signal output by the key switch 130 .

[0062] The key switch 130 can be combined with the display screen 70 to form a touch screen, and the specific structure is not limited.

[0063] In the embodiment of the present invention, an electronic wallet circuit is composed of an NFC antenna 10, an electronic wallet chip 20, a battery 30, a power on / off circuit 40, a button circuit 50, a main control circuit 60, and a display screen 70. The electronic wallet chip 20 feeds back transaction data to the main control circuit 60 after a transaction with a card reader terminal through the NFC antenna 10. The main control circuit 60 is powered by the battery 30 and displays the transaction data through the display screen 70 without the need for display through the card reader terminal. This improves security, simplifies operation, and enhances the user experience.

[0064] like Figure 3 As shown, in one embodiment, the electronic wallet circuit further includes a first switch circuit 80 and a power conversion circuit 90;

[0065] The power input terminal of the first switch circuit 80 is connected to the power terminal of the battery 30, the power input terminal of the power conversion circuit 90 is connected to the NFC antenna 10, the power output terminal of the first switch circuit 80, the power output terminal of the power conversion circuit 90, and the power input terminal of the power switch circuit 40 are interconnected, and the control terminal of the power conversion circuit 90 is connected to the controlled terminal of the first switch circuit 80;

[0066] The power conversion circuit 90 is used to:

[0067] Receive the AC power output by the NFC antenna 10 and convert the AC power into a second DC power;

[0068] When the voltage of the second DC power source is greater than the voltage output by the battery 30 , the first switch circuit 80 is controlled to be turned off, and the second DC power source is output to the switch circuit 40 ;

[0069] When the voltage of the second DC power source is lower than the voltage output by the battery 30 , the first switch circuit 80 is controlled to be turned on and the second DC power source is turned off to be output to the switch circuit 40 .

[0070] In this embodiment, the power conversion circuit 90 operates according to the strength of the electric field between the NFC antenna 10 and the card reader terminal. When the electric field strength of the NFC antenna 10 is large and the power provided by the NFC antenna 10 is sufficient to ensure the operation of each module, that is, when the voltage of the second DC power output by the power conversion circuit 90 is greater than the voltage output by the battery 30, in order to save the power of the battery 30, the power conversion circuit 90 outputs a control signal to control the first switch circuit 80 to turn off, thereby cutting off the output of the battery 30. The power conversion circuit 90 converts and outputs the second DC power to the switch circuit 40. When the switch circuit 40 is triggered to turn on by the key circuit 50, it outputs the first DC power to the main control circuit 60.

[0071] When the field strength of the NFC antenna 10 is weak, that is, when the voltage of the second DC power supply output by the power conversion circuit 90 is lower than the voltage output by the battery 30, in order to ensure the operation of each module, the power conversion circuit 90 outputs a control signal to control the first switch circuit 80 to turn on, and the battery 30 provides operating power to each module.

[0072] The power conversion circuit 90 can be a rectifier and step-down circuit, and the specific structure is not limited.

[0073] like Figure 4 As shown, in one embodiment, the power conversion circuit 90 is also connected to the main control circuit 60;

[0074] The power conversion circuit 90 is also used to send an NFC power-on signal to the main control circuit 60 when the electronic wallet chip 20 is connected to the card reader terminal through the NFC antenna 10, so as to inform the NFC antenna 10 of the connection status.

[0075] like Figure 5 As shown, in one embodiment, the electronic wallet circuit further includes a second switch circuit 100;

[0076] The power input terminal of the second switch circuit 100 is connected to the power output terminal of the power switch circuit 40 , and the power output terminal of the second switch circuit 100 is connected to the power terminal of the electronic wallet chip 20 ;

[0077] The main control circuit 60 is further configured to control the second switch circuit 100 to be turned on when an NFC power-on signal is received, and to control the second switch circuit 100 to be turned off when no NFC power-on signal is received.

[0078] In this embodiment, when the electronic wallet chip 20 is not connected to the card reader terminal through the NFC antenna 10, the voltage of the second DC power supply is zero and less than the battery voltage. The battery 30 outputs the first DC power supply to the main control circuit 60 through the first switch circuit 80 and the switch circuit 40. The main control circuit 60 is powered on and operates. At this time, the power conversion circuit 90 does not send an NFC power-on signal to the main control circuit 60. The main control circuit 60 is powered by the battery 30 and the second switch circuit 100 is controlled to be turned off to reduce the power output of the battery 30 when the electronic wallet circuit is not communicating with the card reader terminal, thereby reducing the energy consumption of the battery 30. At this time, the display screen 70 can be controlled to switch the display interface according to the key trigger signal output by the key switch 130.

[0079] When the electronic wallet chip 20 is connected to the card reader terminal via the NFC antenna 10, the power conversion circuit 90 controls the first switch circuit 80 to be turned on or off according to the voltage of the second DC power supply and the voltage of the battery 30, so that the power conversion circuit 90 or the battery 30 outputs DC power to the switch circuit 40, and the switch circuit 40 then provides working power to the electronic wallet chip 20, ensuring that the electronic wallet chip 20 can stably receive working power and operate when the NFC antenna 10 is connected to the card reader terminal.

[0080] like Figure 6 As shown, in one embodiment, the electronic wallet circuit further includes a bank card chip 110 and a radio frequency switch 120;

[0081] The radio frequency switch 120 is electrically connected to the bank card chip 110, the NFC antenna 10 and the electronic wallet chip 20 respectively;

[0082] The main control circuit 60 is configured to output a first control signal to the RF switch 120 when receiving a power-on signal from the battery 30 , and output a second control signal to the RF switch 120 when not receiving a power-on signal from the battery 30 ;

[0083] The radio frequency switch 120 is configured to connect the electronic wallet chip 20 and the NFC antenna 10 upon receiving a first control signal, so that the electronic wallet chip 20 interacts with the card reader terminal signal through the NFC antenna 10;

[0084] When the second control signal is received, the bank card chip 110 and the NFC antenna 10 are connected, so that the bank card chip 110 interacts with the card reading terminal signal through the NFC antenna 10 .

[0085] In this embodiment, in the power-off state, that is, the power-on circuit 40 does not receive the power-on signal, the battery 30 does not output the first DC power supply, and the main control circuit 60 is not working, the RF switch 120 is connected to the bank card chip 110 by default through the RF switch 120. When wirelessly connected to the card reader terminal, the bank card chip 110 obtains energy from the antenna to power on and enters the working state for data interaction. When the key circuit 50 is turned on, that is, after the battery 30 is powered on and the main control circuit 60 receives the NFC power-on signal, a control signal is sent to the RF switch 120, and the RF switch 120 switches the connection. The NFC antenna 10 is connected to the electronic wallet chip 20. The electronic wallet chip 20 obtains energy from the antenna to power on and enters the working state for data interaction, thereby realizing switching between the bank card chip 110 and the electronic wallet chip 20, thereby improving the diversity of the electronic wallet.

[0086] like Figure 7 As shown, in one embodiment, the power conversion circuit 90 includes a rectifier voltage regulator circuit 91 and an LDO voltage regulator circuit 92;

[0087] The power input terminal of the rectifier and voltage regulator circuit 91 is connected to the NFC antenna 10, the power output terminal of the rectifier and voltage regulator circuit 91 is connected to the power input terminal of the LDO voltage regulator circuit 92, and the power output terminal of the LDO voltage regulator circuit 92 is connected to the power input terminal of the power switch circuit 40. The LDO voltage regulator circuit 92 is also electrically connected to the first switch circuit 80 and the main control circuit 60 respectively.

[0088] The rectifier and voltage regulator circuit 91 is used to rectify and convert the AC power output by the NFC antenna 10 and output a first DC voltage to the LDO voltage regulator circuit 92;

[0089] An LDO voltage regulator circuit 92 is used to convert the first DC voltage into a second DC voltage and output the second DC voltage to the main control circuit 60, the power switch circuit 40 and the first switch circuit 80;

[0090] The first switch circuit 100 is a transistor.

[0091] In this embodiment, the rectifier and voltage regulator circuit 91 is used for rectification and step-down conversion, and the LDO voltage regulator circuit 92 is used to further regulate the voltage and output a second operating voltage that meets the requirements of the main control circuit 60 and the electronic wallet chip 20. At the same time, the LDO voltage regulator circuit 92 controls the first switch circuit 80 to be turned on or off according to the size of the input DC power supply, and feeds back the corresponding NFC power-on signal to the main control circuit 60. The first switch circuit 80 can use a switching device with a controlled function. In one embodiment, the first switch circuit 80 is a transistor.

[0092] like Figure 8 As shown, in one embodiment, the rectifier and voltage-stabilizing circuit 91 includes a rectifier bridge and a voltage-stabilizing diode D5. The voltage-stabilizing diode D5 is connected in reverse parallel to the output end of the rectifier bridge. The rectifier bridge is used for AC / DC conversion, and the voltage-stabilizing diode D5 is used for voltage stabilization.

[0093] like Figure 9 As shown, in one embodiment, the switch circuit 40 includes a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1, a first diode D6, a first electronic switch tube Q1 and a second electronic switch tube Q2;

[0094] The first end of the first capacitor C1, the signal end of the key circuit 50, the first end of the first resistor R1, and the cathode of the first diode D6 are interconnected. The second end of the first capacitor C1, the first end of the second resistor R2, the second end of the first resistor R1, the gate of the first electronic switch tube Q1, and the drain of the second electronic switch tube Q2 are interconnected. The source of the first electronic switch tube Q1 and the second end of the second resistor R2 are connected together to form the power input end of the switch circuit 40. The drain of the first electronic switch tube Q1 is the power output end of the switch circuit 40. The gate of the second electronic switch tube Q2, the first end of the third resistor R3, and the anode of the first diode D6 are respectively connected to the signal end of the main control circuit 60. The second end of the third resistor R3 is connected to the source of the second electronic switch tube Q2.

[0095] In this embodiment, the key circuit 50 is a key K1, and CTR1, CTR2, CTR3, and VOUT are connected to the main control circuit 60. When the key K1 is pressed to turn on the device, the gate of the first electronic switch tube Q1 is turned on at a low level, and the input DC power supply supplies power to the main control circuit 60. At the same time, the CTR3 signal connected to the main control circuit 60 is set to a low level. The main control circuit 60 receives the low level signal of CTR3 and outputs CTR1 to a high level and CTR2 to a low level, turning on the second electronic switch tube Q2. CTR2 sets the drain of the first electronic switch tube Q1 to a low level, and the first electronic switch tube Q1 remains normally on, and the input DC power supply continues to supply power.

[0096] When the power is turned off, press the button again, the CTR3 signal is set to a low level, and the main control circuit 60 turns off the first electronic switch Q1 by outputting CTR1 as a low level, and the DC power supply stops supplying power.

[0097] The present invention also proposes an electronic wallet, which includes an electronic wallet circuit. The specific structure of the electronic wallet circuit refers to the above-mentioned embodiment. Since this electronic wallet adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0098] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention, and should all be included in the scope of protection of the present invention.

Claims

1. An electronic wallet circuit, characterized in that: Including NFC antenna, electronic wallet chip, battery, power on / off circuit, key circuit, main control circuit and display screen; The power on / off circuit is electrically connected to the battery, the main control circuit, and the key circuit respectively; the electronic wallet chip is electrically connected to the NFC antenna and the main control circuit respectively; and the main control circuit is also electrically connected to the display screen; The button circuit is used to output a power on / off signal to the power on / off circuit according to a trigger operation by a user; The battery is used to output a first DC power supply to the switch circuit; The on / off circuit is configured to turn on and transmit the first DC power to the main control circuit according to the on / off signal, or to turn off and stop outputting the first DC power to the main control circuit according to the on / off signal; The electronic wallet chip is used to connect to the card reader terminal through the NFC antenna, power on and perform data exchange, and output transaction data to the main control circuit; The main control circuit is configured to start up upon receiving the first DC power supply and control the display screen to display the transaction data; The electronic wallet circuit further includes a key switch, wherein the key switch is electrically connected to the main control circuit; The main control circuit is further used to control the display screen to switch the display interface according to the key trigger signal output by the key switch; The electronic wallet circuit further includes a first switch circuit and a power conversion circuit; The power input terminal of the first switching circuit is connected to the power terminal of the battery, the power input terminal of the power conversion circuit is connected to the NFC antenna, the power output terminal of the first switching circuit, the power output terminal of the power conversion circuit, and the power input terminal of the switch circuit are interconnected, and the control terminal of the power conversion circuit is connected to the controlled terminal of the first switching circuit; The power conversion circuit is used for: receiving an AC power source output by the NFC antenna and converting the AC power source into a second DC power source; When the voltage of the second DC power supply is greater than the voltage output by the battery, the first switch circuit is controlled to be turned off, and the second DC power supply is output to the switch circuit; When the voltage of the second DC power supply is lower than the voltage output by the battery, the first switch circuit is controlled to be turned on, and the output of the second DC power supply to the switch circuit is cut off.

2. The electronic wallet circuit according to claim 1, wherein: The power conversion circuit is also connected to the main control circuit; The power conversion circuit is further configured to send an NFC power-on signal to the main control circuit when the electronic wallet chip is connected to a card reader terminal via the NFC antenna.

3. The electronic wallet circuit according to claim 2, wherein: The electronic wallet circuit further includes a second switch circuit; The power input terminal of the second switch circuit is connected to the power output terminal of the switch circuit, and the power output terminal of the second switch circuit is connected to the power terminal of the electronic wallet chip; The main control circuit is further configured to control the second switch circuit to be turned on when the NFC power-on signal is received, and to control the second switch circuit to be turned off when the NFC power-on signal is not received.

4. The electronic wallet circuit according to claim 3, wherein: The electronic wallet circuit also includes a bank card chip and a radio frequency switch; The radio frequency switch is electrically connected to the bank card chip, the NFC antenna and the electronic wallet chip respectively; The main control circuit is configured to output a first control signal to the radio frequency switch when a power-on signal from the battery is received, and output a second control signal to the radio frequency switch when no power-on signal from the battery is received; The radio frequency switch is configured to connect the electronic wallet chip and the NFC antenna when receiving the first control signal, so that the electronic wallet chip interacts with the card reader terminal signal through the NFC antenna; When the second control signal is received, the bank card chip and the NFC antenna are connected so that the bank card chip interacts with the card reading terminal signal through the NFC antenna.

5. The electronic wallet circuit according to claim 3, wherein: The power conversion circuit includes a rectifier voltage stabilization circuit and an LDO voltage stabilization circuit; The power input terminal of the rectifier and voltage-stabilizing circuit is connected to the NFC antenna, the power output terminal of the rectifier and voltage-stabilizing circuit is connected to the power input terminal of the LDO voltage-stabilizing circuit, the power output terminal of the LDO voltage-stabilizing circuit is connected to the power input terminal of the switch circuit, and the LDO voltage-stabilizing circuit is also electrically connected to the first switch circuit and the main control circuit respectively; The rectifier and voltage stabilization circuit is configured to rectify and convert the AC power output by the NFC antenna and output a first DC voltage to the LDO voltage stabilization circuit; The LDO voltage stabilizing circuit is configured to convert the first DC voltage into a second DC voltage and output the second DC voltage to the main control circuit, the power on / off circuit, and the first switch circuit; The first switch circuit is a transistor.

6. The electronic wallet circuit according to claim 5, wherein: The rectifier and voltage-stabilizing circuit includes a rectifier bridge and a voltage-stabilizing diode, and the voltage-stabilizing diode is connected in reverse parallel to the output end of the rectifier bridge.

7. The electronic wallet circuit according to claim 1, wherein: The switch circuit includes a first resistor, a second resistor, a third resistor, a first capacitor, a first diode, a first electronic switch tube and a second electronic switch tube; The first end of the first capacitor, the signal end of the key circuit, the first end of the first resistor and the cathode of the first diode are interconnected; the second end of the first capacitor, the first end of the second resistor, the second end of the first resistor, the gate of the first electronic switch tube and the drain of the second electronic switch tube are interconnected; the source of the first electronic switch tube and the second end of the second resistor are connected together to form the power input end of the switch circuit; the drain of the first electronic switch tube is the power output end of the switch circuit; the gate of the second electronic switch tube, the first end of the third resistor and the anode of the first diode are respectively connected to the signal end of the main control circuit; the second end of the third resistor is connected to the source of the second electronic switch tube.

8. An electronic wallet, characterized in that: The electronic wallet comprises the electronic wallet circuit as claimed in any one of claims 1 to 7.

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