Anti-interference RFID card swiping circuit module

Abstract

The utility model relates to an anti-interference RFID card swiping circuit module, which comprises an interface module, a filter module, a control module and a communication module, the control module is composed of a special RFID micro-control unit U1, a filter capacitor C5 and a pull-up resistor R3, and the special RFID micro-control unit U1 receives DVCC and AVCC power supply from the filter module and accesses RF communication feedback signals to a No.16 pin of the special RFID micro-control unit U1 through the filter capacitor C5. Different power supplies are provided for power supply pins of the special RFID micro-control unit U1, more stable power supply is provided for multiple times of filtering, and the special RFID micro-control unit U1 is connected and communicated with an inductor for an external circuit, so that the anti-interference capability is improved, the RFID can stably work under the conditions of large current and high interference, the problem that an existing charging RFID stably works on a charging pile is solved, the anti-interference capability of the RFID is improved, and the service life of the RFID is prolonged. And card swiping charging can be stably carried out on the household charging pile.

Description

Technical Field

[0001] The utility model relates to the field of new energy charging piles, and in particular to an anti-interference RFID card swiping circuit module. Background Art

[0002] A charging pile is a device that replenishes electric energy for electric vehicles, and its function is similar to that of a gas pump in a gas station. It can charge various types of electric vehicles according to different voltage levels. The input end of the charging pile is directly connected to the AC power grid, and the output end is equipped with a charging plug for charging electric vehicles. Charging piles generally provide two charging methods: conventional charging and fast charging. People can use a specific charging card to swipe the card on the human-computer interaction interface provided by the charging pile to perform corresponding operations such as charging method, charging time, and cost data printing. The charging pile display can display data such as charging amount, cost, and charging time.

[0003] However, in the prior art, the existing power supply is not filtered multiple times, and cannot ensure the provision of a stable power supply, thereby failing to ensure that the charging RFID can work stably on the charging pile, resulting in reduced anti-interference ability, and thus failing to ensure stable card swiping charging operations on the home charging pile. Utility Model Content

[0004] In view of the above problems existing in the prior art, the main purpose of the utility model is to provide an anti-interference RFID card swiping circuit module.

[0005] The technical solution of the utility model is as follows: an anti-interference RFID card swiping circuit module, including an interface module, a filtering module, a control module and a communication module, the control module is composed of a dedicated RFID micro control unit U1, a filtering capacitor C5 and a pull-up resistor R3, the dedicated RFID micro control unit U1 receives DVCC and AVCC power supply from the filtering module, and connects the RF communication feedback signal to its pin No. 16 through C5; the communication module includes a resonant inductor L1, a coupling capacitor C1, a filtering capacitor C2, a resonant inductor L2, a coupling capacitor C4 and a filtering capacitor C3, the second end of the resonant inductor L1 is connected to the first end of the coupling capacitor C1, the second end of the coupling capacitor C1 is connected to the copper foil inductor PCB1, the second end of the resonant inductor L2 is connected to the first end of the coupling capacitor C4, the second end of the coupling capacitor C4 is connected to the copper foil inductor PCB2, the filtering capacitor C2 and the filtering capacitor C3 are connected in sequence between the second ends of the coupling capacitor C1 and the coupling capacitor C4, and the second ends of the copper foil inductor PCB1 and the copper foil inductor PCB2 are connected to each other and grounded.

[0006] As a preferred implementation, the interface module includes a CN1 connector, the CN1 connector receives an external power input VDD, and the CN1 connector is connected to an external circuit via a group of communication inductors L3 to L7.

[0007] As a preferred implementation, the filtering module includes a filter inductor BL1, a filter capacitor C6, a filter inductor BL2 and a filter capacitor C7, the first end of the filter inductor BL1 is connected to the power input VDD, the second end of the filter inductor BL1 is connected to the first end of the filter capacitor C6, the second end of the filter inductor BL2 is connected to the first end of the filter capacitor C7 and is externally connected to AVCC, the second end of the filter inductor BL1 is connected to the first end of BL2 and is externally connected to DVCC, and the second ends of the filter capacitor C6 and the filter capacitor C7 are both grounded.

[0008] As a preferred implementation, the communication inductors L3 to L7 respectively correspond to different communication control signal pins of the dedicated RFID micro control unit U1.

[0009] As a preferred implementation, the filter inductor BL1 and the filter capacitor C6 are configured to filter the DVCC power line, and the filter inductor BL2 and the filter capacitor C7 are configured to filter the AVCC power line.

[0010] As a preferred implementation, the resonant inductors L1 and L2 and the coupling capacitors C1 and C4 of the communication module are configured to match the frequency of the RF signal.

[0011] Compared with the prior art, the advantages and positive effects of the utility model are:

[0012] In the utility model, different power supplies are provided to the power pin of the dedicated RFID microcontroller unit U1, multiple filtering is used to provide a more stable power supply, and the communication with the external circuit is connected by inductance to improve the anti-interference ability, so that the RFID can work stably under high current and high interference conditions, solve the problem of the existing charging RFID working stably on the charging pile, improve its anti-interference ability, and stably carry out the application field of card swiping charging at home charging piles. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A schematic diagram of the structure of the control module provided by the utility model;

[0014] Figure 2 A schematic diagram of the structure of the interface module provided by the utility model;

[0015] Figure 3 A schematic diagram of the structure of the communication module provided by the utility model;

[0016] Figure 4 This is a structural schematic diagram of the filter module provided by the utility model. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments.

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0019] Example 1

[0020] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, the utility model provides a technical solution: including an interface module, a filter module, a control module and a communication module, the interface module includes a CN1 socket, the CN1 socket receives an external power input VDD, and the CN1 socket realizes communication with an external circuit through a group of communication inductors L3 to L7;

[0021] The filter module includes a filter inductor BL1 and a filter capacitor C6, as well as a filter inductor BL2 and a filter capacitor C7, which are used to filter the input power supply VDD and supply power to DVCC and AVCC of the control module;

[0022] The control module is composed of a dedicated RFID microcontroller unit U1, a filter capacitor C5 and a pull-up resistor R3. The dedicated RFID microcontroller unit U1 receives DVCC and AVCC power from the filter module and connects the RF communication feedback signal to its pin 16 through C5;

[0023] The communication module includes a resonant inductor L1, a coupling capacitor C1, and a filter capacitor C2 connected to the copper foil inductor PCB1, and another group of resonant inductors L2, coupling capacitors C4, and filter capacitors C3 connected to the copper foil inductor PCB2, which are used to form an RF communication transmitting and receiving circuit to achieve high-frequency communication.

[0024] In this embodiment, different power supplies are provided to the power pin of the dedicated RFID micro control unit U1, multiple filtering is used to provide a more stable power supply, and the communication with the external circuit is connected by inductance to improve the anti-interference ability, so that the RFID can work stably under high current and high interference conditions, solve the problem of the existing charging RFID working stably on the charging pile, improve its anti-interference ability, and stabilize the application field of card swiping charging at home charging piles.

[0025] Example 2

[0026] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, the communication inductors L3 to L7 of the interface module each correspond to a different communication control signal pin of the dedicated RFID micro control unit U1 to achieve communication and signal transmission with the external circuit;

[0027] The filter inductor BL1 and the filter capacitor C6 in the filter module are configured to filter the DVCC power line, while the filter inductor BL2 and the filter capacitor C7 are configured to filter the AVCC power line to reduce power supply noise and provide stable power supply to the control module;

[0028] The resonant inductors L1, L2 and coupling capacitors C1, C4 of the communication module are configured to match the frequency of the RF signal, and achieve efficient signal transmission and anti-interference communication through the filter capacitors C2, C3 and the copper foil inductors PCB1, PCB2.

[0029] Working principle: Interface module:

[0030] The CN1 socket is connected to the external power input, and the communication control signal communicates with the external circuit through the communication inductors L3, L4, L5, L6, and L7;

[0031] Filter module:

[0032] It is composed of filter inductor BL1, filter capacitor C6, filter inductor BL2 and filter capacitor C7. The input power supply VDD passes through filter inductor BL1 and filter C6 to supply power to the control module DVCC. DVCC then passes through filter inductor BL2 and filter C7 to provide power to the control module pin AVCC circuit.

[0033] Control Module:

[0034] The dedicated RFID MCU U1, filter capacitor C5, and pull-up resistor R3 are composed. The RFID MCU U1 is powered by the filter module with power DVCC and AVCC. The RF communication feedback signal is connected to the RFID MCU U116 pin through C5. At the same time, the RF signal communication is connected to the RF communication module through the corresponding pin of the RFID MCU U1.

[0035] Communication module:

[0036] The RF communication signal passes through the resonant inductor L1, coupling capacitor C1, filter capacitor C2, and is connected to the copper foil inductor PCB1. The RF communication signal also passes through the resonant inductor L2, coupling capacitor C4, filter capacitor C3, and is connected to the copper foil inductor PCB2. This constitutes the RF communication transmitting and receiving circuit for RF high-frequency communication;

[0037] The invention solves the problem of stable operation of existing charging RFID on charging piles, improves its anti-interference ability, and stably implements the application field of card swiping charging on household charging piles.

[0038] Finally, it should be noted that the above-described embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model 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 replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of the utility model.

Claims

1. An anti-interference RFID card swiping circuit module, comprising an interface module, a filter module, a control module and a communication module, characterized in that: The control module is composed of a dedicated RFID micro control unit U1, a filter capacitor C5 and a pull-up resistor R3. The dedicated RFID micro control unit U1 receives DVCC and AVCC power from the filter module and connects the RF communication feedback signal to its pin 16 through C5; The communication module includes a resonant inductor L1, a coupling capacitor C1, a filter capacitor C2, a resonant inductor L2, a coupling capacitor C4 and a filter capacitor C3. The second end of the resonant inductor L1 is connected to the first end of the coupling capacitor C1, the second end of the coupling capacitor C1 is connected to the copper foil inductor PCB1, the second end of the resonant inductor L2 is connected to the first end of the coupling capacitor C4, the second end of the coupling capacitor C4 is connected to the copper foil inductor PCB2, the filter capacitor C2 and the filter capacitor C3 are connected in sequence between the second ends of the coupling capacitor C1 and the coupling capacitor C4, and the second ends of the copper foil inductor PCB1 and the copper foil inductor PCB2 are connected to each other and grounded.

2. The anti-interference RFID card swiping circuit module according to claim 1, characterized in that: The interface module includes a CN1 socket, the CN1 socket receives an external power input VDD, and the CN1 socket is connected to an external circuit through a group of communication inductors L3 to L7.

3. The anti-interference RFID card swiping circuit module according to claim 1, characterized in that: The filtering module includes a filtering inductor BL1, a filtering capacitor C6, a filtering inductor BL2 and a filtering capacitor C7. The first end of the filtering inductor BL1 is connected to the power input VDD, the second end of the filtering inductor BL1 is connected to the first end of the filtering capacitor C6, the second end of the filtering inductor BL2 is connected to the first end of the filtering capacitor C7 and is externally connected to AVCC, the second end of the filtering inductor BL1 is connected to the first end of BL2 and is externally connected to DVCC, and the second ends of the filtering capacitor C6 and the filtering capacitor C7 are both grounded.

4. The anti-interference RFID card swiping circuit module according to claim 2, characterized in that: The communication inductors L3 to L7 correspond to different communication control signal pins of the dedicated RFID micro control unit U1 respectively.

5. The anti-interference RFID card swiping circuit module according to claim 3, characterized in that: The filter inductor BL1 and the filter capacitor C6 are configured to filter the DVCC power line, while the filter inductor BL2 and the filter capacitor C7 are configured to filter the AVCC power line.

6. The anti-interference RFID card swiping circuit module according to claim 1, characterized in that: The resonant inductors L1 , L2 and coupling capacitors C1 , C4 of the communication module are configured to match the frequency of the RF signal.

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