Card reading circuit and electronic equipment

Abstract

A card reading circuit and an electronic device belong to the technical field of card readers, a first filter circuit comprises a plurality of sub first filter circuits, a second filter circuit comprises a plurality of sub second filter circuits, an adjusting circuit comprises a plurality of sub adjusting circuits, and a coil circuit comprises a plurality of sub coil circuits. The first selection circuit connects the plurality of sub-coil circuits to the adjusting circuit; the second selection circuit connects the plurality of sub-adjusting circuits to the first filter circuit and the second filter circuit; the third selection circuit connects the plurality of sub-first filter circuits to the control circuit; according to the card reading circuit, parameter matching and adjustment can be carried out according to corresponding IC cards through the first selection circuit, the second selection circuit, the third selection circuit and the fourth selection circuit when the card reading circuit reads the cards, the performance difference existing when the card reading circuit reads the different IC cards is reduced, and the card reading efficiency is improved. And the compatibility of the card reading circuit is improved.

Description

Technical Field

[0001] The present application belongs to the technical field of card readers, and in particular, relates to a card reading circuit and electronic equipment. Background Art

[0002] At present, the performance improvement of card readers and integrated circuit cards (IC cards) mostly depends on the improvement of the transmission field strength gain and receiving circuit threshold of the card reader chip. As a passive device, the communication quality of IC cards depends on the coupling and matching of circuit passive components and IC card coils. However, there are many IC card manufacturers, and the design consistency of IC card coils and their internal matching capacitors is poor, and the frequency offset is different. The matching adjustment of circuit passive components in card readers is fixed during the design of printed circuit boards, and there is no room for adjustment after mass production of products; therefore, there are performance differences when card readers read different IC cards, and the compatibility is poor. Summary of the invention

[0003] The purpose of the present application is to provide a card reading circuit and electronic equipment, aiming to solve the problem that the existing card reader has performance differences and poor compatibility when reading different IC cards.

[0004] The embodiment of the present application provides a card reading circuit, connected to a control circuit, including a first filter circuit, a second filter circuit, a regulating circuit and a coil circuit;

[0005] The first filter circuit includes a plurality of sub-first filter circuits, the second filter circuit includes a plurality of sub-second filter circuits, the adjustment circuit includes a plurality of sub-adjustment circuits, and the coil circuit includes a plurality of sub-coil circuits;

[0006] The card reading circuit also includes:

[0007] A first selection circuit is connected to the coil circuit and the adjustment circuit and is configured to connect a plurality of the sub-coil circuits to the adjustment circuit;

[0008] a second selection circuit connected to the regulating circuit, the first filtering circuit and the second filtering circuit, and configured to connect the plurality of sub-regulating circuits to the first filtering circuit and the second filtering circuit;

[0009] a third selection circuit connected to the first filter circuit and the control circuit, and configured to connect a plurality of the sub-first filter circuits to the control circuit;

[0010] The fourth selection circuit is connected to the second filter circuit and is configured to connect the plurality of sub-second filter circuits to a power ground.

[0011] In one of the embodiments, the card reading circuit further includes a receiving circuit and the fifth selection circuit;

[0012] The receiving circuit includes a plurality of sub-receiving circuits;

[0013] The fifth selection circuit is connected to the receiving circuit and the control circuit and is configured to connect the plurality of sub-receiving circuits to the control circuit;

[0014] The second selection circuit is further configured to connect a plurality of the sub-regulation circuits to the receiving circuit.

[0015] In one of the embodiments, the sub-receiving circuit includes a third resistor and a third capacitor;

[0016] The first end of the third resistor serves as the first input and output end of the sub-receiving circuit and is connected to the fifth selection circuit. The second end of the third resistor is connected to the first end of the third capacitor. The second end of the third capacitor serves as the second input and output end of the sub-receiving circuit and is connected to the first filtering circuit, the second filtering circuit and the second selection circuit.

[0017] In one embodiment, the card reading circuit further includes:

[0018] The third filtering circuit is connected between the control circuit and the third selection circuit, and is configured to access the first wired communication signal output by the control circuit and filter the first wired communication signal.

[0019] In one embodiment, the third filtering circuit includes a first inductor, a second inductor, a fourth capacitor and a fifth capacitor;

[0020] The first end of the first inductor and the first end of the second inductor serve together as the first wired communication signal input end of the third filtering circuit, and are connected to the control circuit to input the first wired communication signal; the second end of the first inductor, the second end of the second inductor, the first end of the fourth capacitor and the first end of the fifth capacitor serve together as the first wired communication signal output end after filtering of the third filtering circuit, and are connected to the third selection circuit to output the first wired communication signal after filtering; the second end of the fourth capacitor and the second end of the fifth capacitor are commonly connected to the power ground.

[0021] In one of the embodiments, the sub-first filter circuit includes a second capacitor;

[0022] The first end of the first capacitor and the first end of the second capacitor serve together as the first input and output end of the sub-first filter circuit and are connected to the third selection circuit. The second end of the first capacitor and the second end of the second capacitor serve together as the second input and output end of the sub-first filter circuit and are connected to the receiving circuit, the second filter circuit and the second selection circuit.

[0023] In one embodiment, the sub-second filtering circuit includes a sixth capacitor and a seventh capacitor;

[0024] The first end of the sixth capacitor and the first end of the seventh capacitor serve together as the first input and output end of the sub-second filter circuit and are connected to the fourth selection circuit. The second end of the sixth capacitor and the second end of the seventh capacitor serve together as the second input and output end of the sub-second filter circuit and are connected to the receiving circuit, the first filter circuit and the second selection circuit.

[0025] In one of the embodiments, the sub-regulation circuit includes a second resistor;

[0026] The first end of the first resistor and the first end of the second resistor serve together as the first input and output end of the sub-regulation circuit and are connected to the second selection circuit. The second end of the first resistor and the second end of the second resistor serve together as the second input and output end of the sub-regulation circuit and are connected to the first selection circuit.

[0027] In one of the embodiments, the sub-coil circuit includes a coupling coil;

[0028] The first end of the coupling coil serves as the first input and output end of the sub-coil circuit, and the second end of the coupling coil serves as the second input and output end of the sub-coil circuit. The first end of the coupling coil and the second end of the coupling coil are commonly connected to the first selection circuit.

[0029] In one embodiment, the first selection circuit, the second selection circuit, the third selection circuit, and the fourth selection circuit all include a dip switch or an analog switch.

[0030] An embodiment of the present application further provides an electronic device, which includes the above-mentioned card reading circuit.

[0031] Compared with the prior art, the embodiments of the present application have the following beneficial effects: the first filter circuit includes multiple sub-first filter circuits, the second filter circuit includes multiple sub-second filter circuits, the adjustment circuit includes multiple sub-adjustment circuits, and the coil circuit includes multiple sub-coil circuits; the first selection circuit connects the multiple sub-coil circuits to the adjustment circuit; the second selection circuit connects the multiple sub-adjustment circuits to the first filter circuit and the second filter circuit; the third selection circuit connects the multiple sub-first filter circuits to the control circuit; the fourth selection circuit connects the multiple sub-second filter circuits to the power ground, and through the first selection circuit, the second selection circuit, the third selection circuit and the fourth selection circuit, the card reader circuit can match and adjust parameters according to the corresponding IC card when reading the card, thereby reducing the performance difference of the card reader circuit when reading different IC cards and improving the compatibility of the card reader circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical application in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0033] Figure 1 A schematic diagram of a card reading circuit provided in one embodiment of the present application;

[0034] Figure 2 Another structural schematic diagram of a card reading circuit provided in an embodiment of the present application;

[0035] Figure 3 Another structural schematic diagram of a card reading circuit provided in an embodiment of the present application;

[0036] Figure 4 A partial exemplary circuit schematic diagram of a card reader circuit provided in one embodiment of the present application. DETAILED DESCRIPTION

[0037] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0038] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0039] It should be understood that the orientation or position relationship indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0040] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0041] Figure 1 The structure diagram of the card reading circuit 10 provided in one embodiment of the present application is shown. For the convenience of description, only the part related to the present embodiment is shown, which is described in detail as follows:

[0042] The card reading circuit 10 is connected to the control circuit 20 , and includes a first filter circuit 100 , a second filter circuit 200 , an adjustment circuit 300 , a coil circuit 400 , a first selection circuit 500 , a second selection circuit 600 , a third selection circuit 700 and a fourth selection circuit 800 .

[0043] The first filter circuit 100 includes a plurality of sub-first filter circuits 110 , the second filter circuit 200 includes a plurality of sub-second filter circuits 210 , the adjustment circuit 300 includes a plurality of sub-adjustment circuits 310 , and the coil circuit 400 includes a plurality of sub-coil circuits 410 .

[0044] The first selection circuit 500 is connected to the coil circuit 400 and the adjustment circuit 300 , and is configured to connect the plurality of sub-coil circuits 410 to the adjustment circuit 300 .

[0045] The second selection circuit 600 is connected to the regulating circuit 300 , the first filtering circuit 100 and the second filtering circuit 200 , and is configured to connect the plurality of sub-regulating circuits 310 to the first filtering circuit 100 and the second filtering circuit 200 .

[0046] The third selection circuit 700 is connected to the first filter circuit 100 and the control circuit 20 , and is configured to connect the plurality of sub-first filter circuits 110 to the control circuit 20 .

[0047] The fourth selection circuit 800 is connected to the second filter circuit 200 and is configured to connect the plurality of sub-second filter circuits 210 to the power ground.

[0048] The control circuit 20 obtains the corresponding target configuration information according to the identity identifier of the IC card, and sets each selection circuit according to the target configuration information. The control circuit 20 outputs the first wired communication signal to the configured third selection circuit 700, and the third selection circuit 700 transmits the first wired communication signal to a sub-first filter circuit 110, and the sub-first filter circuit 110 performs a first filtering on the first wired communication signal and outputs the first wired communication signal after the first filtering; the configured fourth selection circuit 800 selects a sub-second filter circuit 210, and the first wired communication signal after the first filtering is connected to the sub-second filter circuit 210. The sub-second filter circuit 210 performs a second filtering on the first wired communication signal after the first filtering. The configured second selection circuit 600 transmits the first wired communication signal after the second filtering to a sub-adjustment circuit 310, and the sub-adjustment circuit 310 adjusts the quality of the first wired communication signal after the second filtering, and transmits the adjusted first wired communication signal to a sub-coil circuit 410 through the configured first selection circuit 500 so that the sub-coil circuit 410 sends the first wireless communication signal to the IC card.

[0049] Through the first selection circuit 500, the second selection circuit 600, the third selection circuit 700 and the fourth selection circuit 800, when the card reader circuit 10 reads a card, it can match and adjust the parameters of the first filter circuit 100, the second filter circuit 200, the adjustment circuit 300 and the coil circuit 400 according to the identity identification of the IC card, thereby increasing the selectivity of the circuit passive components, reducing the performance difference of the card reader circuit 10 when reading different IC cards, achieving the effect of matching and being compatible with the physical parameters of different IC cards, and improving the compatibility of the card reader circuit 10.

[0050] By way of example and not limitation, Figure 2 As shown, the card reading circuit 10 further includes a receiving circuit 900 and a fifth selection circuit 1000 .

[0051] The receiving circuit 900 includes a plurality of receiving sub-circuits 910 .

[0052] The fifth selection circuit 1000 is connected to the receiving circuit 900 and the control circuit 20 , and is configured to connect the plurality of sub-receiving circuits 910 to the control circuit 20 .

[0053] The second selection circuit 600 is further configured to connect the plurality of sub-regulation circuits 310 to the receiving circuit 900 .

[0054] When reading the card, the sub-coil circuit 410 of the default configuration is coupled with the IC card to output a second wired communication signal carrying the IC card information to the first selection circuit 500. The first selection circuit 500 transmits the second wired communication signal to the sub-adjustment circuit 310 of the default configuration for adjustment. The sub-adjustment circuit 310 outputs the adjusted second wired communication signal to the second selection circuit 600. The second selection circuit 600 outputs the adjusted second wired communication signal. The sub-second filter circuit 210 and the sub-first filter circuit 110 of the default configuration filter the adjusted second wired communication signal and output the filtered second wired communication signal to the sub-receiving circuit 910 of the default configuration. The sub-receiving circuit 910 adjusts the amplitude and frequency of the filtered second wired communication signal and transmits it to the control circuit 20 through the fifth selection circuit 1000. The control circuit 20 parses the second wired communication signal to obtain the identity of the IC card.

[0055] If the control circuit 20 stores the target configuration information corresponding to the identity identifier of the IC card, each selection circuit is configured according to the target configuration information, and each sub-first filter circuit 110, each sub-second filter circuit 210, each sub-adjustment circuit 310, each sub-coil circuit 410 and each sub-receiving circuit 910 are selected according to each configured selection circuit. The control circuit 20 communicates with the IC card through the selected sub-first filter circuit 110, sub-second filter circuit 210, sub-adjustment circuit 310, sub-coil circuit 410 and sub-receiving circuit 910.

[0056] If the control circuit 20 does not store the target configuration information corresponding to the identity identification of the IC card, then corresponding to each switch combination of each selection circuit, the first wired communication signal is sent for a preset number of times, so that the IC card sends the second wireless communication signal, the sub-coil circuit 410 converts the second wireless communication signal into a second wired communication signal, and the second wired communication signal is sent to the control circuit 20 via the sub-adjustment circuit 310 and the sub-receiving circuit 910 in sequence, and the control circuit 20 obtains the quality parameter and card reading success rate of the second wired communication signal received in each switch combination of each selection circuit, and sets the transmission link configuration information according to the card reading success rate, the transmission link configuration information includes the configuration information of the first selection circuit 500, the configuration information of the second selection circuit 600, the configuration information of the third selection circuit 700 and the configuration information of the fourth selection circuit 800, and sets the configuration information of the fifth selection circuit 1000 according to the quality parameter of the second wired communication signal, and finally obtains the target configuration information according to the transmission link configuration information and the configuration information of the fifth selection circuit 1000 and saves the target configuration information. Afterwards, each selection circuit is configured according to the target configuration information and communicates with the IC card.

[0057] It should be noted that the second wired communication signal may be a subcarrier modulation signal of the first wired communication signal.

[0058] By performing parameter matching and adjustment on the receiving circuit 900 and the fifth selection circuit 1000 , the compatibility of the card reading circuit 10 is further improved.

[0059] By way of example and not limitation, Figure 3 As shown, the card reading circuit 10 further includes a third filtering circuit 1100 .

[0060] The third filtering circuit 1100 is connected between the control circuit 20 and the third selection circuit 700 , and is configured to access the first wired communication signal output by the control circuit 20 and filter the first wired communication signal.

[0061] The third filtering circuit 1100 removes interference signals from the first wired communication signal, thereby improving the reliability of the first wired communication signal.

[0062] As an example but not limitation, the first selection circuit 500 , the second selection circuit 600 , the third selection circuit 700 , and the fourth selection circuit 800 all include a dip switch or an analog switch.

[0063] The dip switch has a simple structure, is easy to use and has high reliability.

[0064] Analog switches have low power consumption, high speed and long service life.

[0065] Figure 4 A partial exemplary circuit structure of the card reading circuit 10 provided in an embodiment of the present application is shown. For the sake of convenience, only the part related to the embodiment of the present application is shown, which is described in detail as follows:

[0066] The sub-receiving circuit 910 - i includes a third resistor R3 and a third capacitor C3 , where i is a positive integer greater than or equal to 1.

[0067] The first end of the third resistor R3 serves as the first input and output end of the sub-receiving circuit 910-i, and is connected to the fifth selection circuit 1000. The second end of the third resistor R3 is connected to the first end of the third capacitor C3. The second end of the third capacitor C3 serves as the second input and output end of the sub-receiving circuit 910-i, and is connected to the first filtering circuit 100, the second filtering circuit 200 and the second selection circuit 600.

[0068] It should be noted that the resistance value of the third resistor R3 and the capacitance value of the third capacitor C3 in the multiple sub-receiving circuits 910 can be adjusted according to actual conditions.

[0069] The circuit is simple and the cost is low.

[0070] The third filter circuit 1100 includes a first inductor L1, a second inductor L2, a fourth capacitor C4 and a fifth capacitor C5.

[0071] The first end of the first inductor L1 and the first end of the second inductor L2 serve together as the first wired communication signal input end of the third filtering circuit 1100, and are connected to the control circuit 20 to input the first wired communication signal; the second end of the first inductor L1, the second end of the second inductor L2, the first end of the fourth capacitor C4 and the first end of the fifth capacitor C5 serve together as the filtered first wired communication signal output end of the third filtering circuit 1100, and are connected to the third selection circuit 700 to output the filtered first wired communication signal; the second end of the fourth capacitor C4 and the second end of the fifth capacitor C5 are commonly connected to the power ground.

[0072] The circuit has a simple structure and high reliability.

[0073] The first sub-filter circuit 110 - i includes a first capacitor C1 and a second capacitor C2 , where i is a positive integer greater than or equal to 1.

[0074] The first end of the first capacitor C1 and the first end of the second capacitor C2 serve together as the first input and output end of the sub-first filter circuit 110-i, and are connected to the third selection circuit 700. The second end of the first capacitor C1 and the second end of the second capacitor C2 serve together as the second input and output end of the sub-first filter circuit 110-i, and are connected to the receiving circuit 900, the second filter circuit 200 and the second selection circuit 600.

[0075] The capacitance values ​​of the plurality of first capacitors C1 and the plurality of second capacitors C2 can be adjusted according to actual conditions.

[0076] The circuit has a simple structure and readily available components, further reducing costs.

[0077] The sub-second filtering circuit 210 - i includes a sixth capacitor C6 and a seventh capacitor C7 , where i is a positive integer greater than or equal to 1.

[0078] The first end of the sixth capacitor C6 and the first end of the seventh capacitor C7 serve together as the first input and output end of the sub-second filter circuit 210-i, and are connected to the fourth selection circuit 800. The second end of the sixth capacitor C6 and the second end of the seventh capacitor C7 serve together as the second input and output end of the sub-second filter circuit 210-i, and are connected to the receiving circuit 900, the first filter circuit 100 and the second selection circuit 600.

[0079] The capacitance values ​​of the plurality of sixth capacitors C6 and the plurality of seventh capacitors C7 can be adjusted according to actual conditions.

[0080] The circuit has a simple structure and readily available components, further reducing costs.

[0081] The sub-regulation circuit 310 - i includes a first resistor R1 and a second resistor R2 , where i is a positive integer greater than or equal to 1.

[0082] The first end of the first resistor R1 and the first end of the second resistor R2 serve together as the first input and output ends of the sub-regulation circuit 310-i, and are connected to the second selection circuit 600. The second end of the first resistor R1 and the second end of the second resistor R2 serve together as the second input and output ends of the sub-regulation circuit 310-i, and are connected to the first selection circuit 500.

[0083] The resistance values ​​of the plurality of first resistors R1 and the plurality of second resistors R2 can be adjusted according to actual conditions.

[0084] The signal quality is adjusted by the first resistor R1, thereby improving the quality and stability of the signal.

[0085] The sub-coil circuit 410 - i includes a coupling coil A1 , where i is a positive integer greater than or equal to 1.

[0086] The first end of the coupling coil A1 serves as the first input and output end of the sub-coil circuit 410-i, and the second end of the coupling coil A1 serves as the second input and output end of the sub-coil circuit 410-i. The first end of the coupling coil A1 and the second end of the coupling coil A1 are connected to the first selection circuit 500 together.

[0087] The number of turns, length and spacing of the multiple coupling coils A1 can be adjusted according to actual conditions.

[0088] An electromagnetic field is generated in the card reading circuit 10 by the coupling coil A1, so that information can be exchanged between the card reading circuit 10 and the IC card without contact, thereby improving convenience.

[0089] The first selection circuit 500 includes a first switch S1 and a second switch S2.

[0090] The common end of the first switch S1 and the common end of the second switch S2 are commonly connected to the first sub-regulation circuit 310-1 and the second sub-regulation circuit 310-2, the normally-open end of the first switch S1 and the normally-closed end of the second switch S2 are connected to the first sub-coil circuit 410-1, and the normally-closed end of the first switch S1 and the normally-open end of the second switch S2 are connected to the second sub-coil circuit 410-2.

[0091] The second selection circuit 600 includes a third switch S3 and a fourth switch S4.

[0092] The common end of the third switch S3 is connected to the first sub-first filter circuit 110-1, the second sub-first filter circuit 110-2, the first sub-second filter circuit 210-1, the second sub-second filter circuit 210-2 and the sub-receiving circuit 910; the common end of the fourth switch S4 is connected to the sub-first filter circuit 110-1, the sub-first filter circuit 110-2, the sub-second filter circuit 210-1 and the sub-second filter circuit 210-2; the normally closed end of the third switch S3 and the normally closed end of the fourth switch S4 are connected to the first sub-regulation circuit 310-1, and the normally open end of the third switch S3 and the normally open end of the fourth switch S4 are connected to the second sub-regulation circuit 310-2.

[0093] The third selection circuit 700 includes a fifth switch S5 and a sixth switch S6.

[0094] The common end of the fifth switch S5 and the common end of the sixth switch S6 are commonly connected to the third filter circuit 1100, the normally closed end of the fifth switch S5 and the normally closed end of the sixth switch S6 are connected to the first sub-first filter circuit 110-1, and the normally open end of the fifth switch S5 and the normally open end of the sixth switch S6 are connected to the second sub-first filter circuit 110-2.

[0095] The fourth selection circuit 800 includes a seventh switch S7 and an eighth switch S8.

[0096] The common end of the seventh switch S7 and the common end of the eighth switch S8 are commonly connected to the power ground; the normally closed end of the seventh switch S7 and the normally closed end of the eighth switch S8 are connected to the first sub-second filter circuit 210-1, and the normally open end of the seventh switch S7 and the normally open end of the eighth switch S8 are connected to the second sub-second filter circuit 210-2.

[0097] The following is a combination of working principles Figure 4 As shown for further explanation:

[0098] When reading a card, the control circuit 20 searches for corresponding target configuration information according to the identity identifier of the IC card, and configures each selection circuit according to the target configuration information. The control circuit 20 outputs the first wired communication signal to the first end of the first inductor L1 and the first end of the second inductor L2, the first inductor L1, the fourth capacitor C4, the second inductor L2 and the fifth capacitor C5 perform a first filtering on the first wired communication signal, and output the first wired communication signal after the first filtering from the second end of the first inductor L1, the second end of the second inductor L2, the first end of the fourth capacitor C4 and the first end of the fifth capacitor C5 to the common end of the fifth switch S5 and the common end of the sixth switch S6, the fifth switch S5 and the sixth switch S6 output the first wired communication signal after the first filtering to a sub-first filtering circuit 110-1, the first capacitor C1 and the second capacitor C2 in the sub-first filtering circuit 110-i perform a second filtering on the first wired communication signal after the first filtering, and output the first wired communication signal after the second filtering from the second end of the first capacitor C1 and the second end of the second capacitor C2; the configured seventh switch S7 and the configured eighth switch S8 are connected to a sub-second filtering circuit 210-i, and the first wired communication signal after the second filtering is connected to The sub-second filtering circuit 210-i, the sixth capacitor C6 and the seventh capacitor C7 in the sub-second filtering circuit 210-i perform a third filtering on the first wired communication signal, and output the third filtered first wired communication signal from the second end of the sixth capacitor C6 and the second end of the seventh capacitor C7 to the common end of the third switch S3 and the common end of the fourth switch S4. The configured third switch S3 and the configured fourth switch S4 output the third filtered first wired communication signal to a sub-adjustment circuit 310-i. The first resistor R1 and the second resistor R2 in the sub-adjustment circuit 310-i perform quality adjustment on the third filtered first wired communication signal, and output the adjusted first wired communication signal from the second end of the first resistor R1 and the second end of the second resistor R2 to the common end of the first switch S1 and the common end of the second switch S2. The configured first switch S1 and the configured second switch S2 output the adjusted first wired communication signal to a sub-coil circuit 410-i, so that the coupling coil A1 in the sub-coil circuit 410-i sends the first wireless communication signal to the IC card.

[0099] A coupling coil A1 in a sub-coil circuit 410-i is coupled with an IC card to output a second wired communication signal carrying IC card information to a first switch S1 and a second switch S2. The configured first switch S1 and the configured second switch S2 output the second wired communication signal from a common end of the first switch S1 and a common end of the second switch S2 to a sub-regulation circuit 310-i. The first resistor R1 and the second resistor R2 in the sub-regulation circuit 310-i regulate the quality of the second wired communication signal, and output the regulated second wired communication signal from a first end of the first resistor R1 and a first end of the second resistor R2 to a third switch S3 and a fourth switch S4. The configured third switch S3 and the configured fourth switch S4 transmit the regulated second wired communication signal from a common end of the third switch S3 and a common end of the fourth switch S4 to a sub-regulation circuit 310-i. The first filtering circuit 110-i and a sub-second filtering circuit 210-i, the first capacitor C1 in the sub-first filtering circuit 110-i, the second capacitor C2 in the sub-first filtering circuit 110-i, the sixth capacitor C6 in the sub-second filtering circuit 210-i and the seventh capacitor C7 in the sub-second filtering circuit 210-i filter the second wired communication signal, and output the filtered second wired communication signal from the second end of the first capacitor C1 and the second end of the sixth capacitor C6 to a sub-receiving circuit 910-i, the third capacitor C3 and the third resistor R3 in the sub-receiving circuit 910-i adjust the amplitude and frequency of the filtered second wired communication signal, and output the adjusted second wired communication signal from the first end of the third resistor R3 to the control circuit 20, and the control circuit 20 analyzes the second wired communication signal.

[0100] An embodiment of the present application further provides an electronic device, which includes the above-mentioned card reading circuit.

[0101] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0102] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A card reading circuit connected to a control circuit, characterized in that: It includes a first filtering circuit, a second filtering circuit, a regulating circuit and a coil circuit; The first filter circuit includes a plurality of sub-first filter circuits, the second filter circuit includes a plurality of sub-second filter circuits, the adjustment circuit includes a plurality of sub-adjustment circuits, and the coil circuit includes a plurality of sub-coil circuits; The card reading circuit also includes: A first selection circuit is connected to the coil circuit and the adjustment circuit and is configured to connect a plurality of the sub-coil circuits to the adjustment circuit; a second selection circuit connected to the regulating circuit, the first filtering circuit and the second filtering circuit, and configured to connect the plurality of sub-regulating circuits to the first filtering circuit and the second filtering circuit; a third selection circuit connected to the first filter circuit and the control circuit, and configured to connect a plurality of the sub-first filter circuits to the control circuit; The fourth selection circuit is connected to the second filter circuit and is configured to connect the plurality of sub-second filter circuits to a power ground.

2. The card reading circuit according to claim 1, characterized in that: Also includes a receiving circuit and a fifth selection circuit; The receiving circuit includes a plurality of sub-receiving circuits; The fifth selection circuit is connected to the receiving circuit and the control circuit and is configured to connect the plurality of sub-receiving circuits to the control circuit; The second selection circuit is further configured to connect a plurality of the sub-regulation circuits to the receiving circuit.

3. The card reading circuit according to claim 2, characterized in that: The sub-receiving circuit includes a third resistor and a third capacitor; The first end of the third resistor serves as the first input and output end of the sub-receiving circuit and is connected to the fifth selection circuit. The second end of the third resistor is connected to the first end of the third capacitor. The second end of the third capacitor serves as the second input and output end of the sub-receiving circuit and is connected to the first filtering circuit, the second filtering circuit and the second selection circuit.

4. The card reading circuit according to claim 1, characterized in that: Also includes: The third filtering circuit is connected between the control circuit and the third selection circuit, and is configured to access the first wired communication signal output by the control circuit and filter the first wired communication signal.

5. The card reading circuit according to claim 4, characterized in that: The third filtering circuit includes a first inductor, a second inductor, a fourth capacitor and a fifth capacitor; The first end of the first inductor and the first end of the second inductor serve together as the first wired communication signal input end of the third filtering circuit, and are connected to the control circuit to input the first wired communication signal; the second end of the first inductor, the second end of the second inductor, the first end of the fourth capacitor and the first end of the fifth capacitor serve together as the first wired communication signal output end after filtering of the third filtering circuit, and are connected to the third selection circuit to output the first wired communication signal after filtering; the second end of the fourth capacitor and the second end of the fifth capacitor are commonly connected to the power ground.

6. The card reading circuit according to claim 1, characterized in that: The sub-first filtering circuit includes a first capacitor and a second capacitor; The first end of the first capacitor and the first end of the second capacitor serve together as the first input and output end of the sub-first filter circuit and are connected to the third selection circuit. The second end of the first capacitor and the second end of the second capacitor serve together as the second input and output end of the sub-first filter circuit and are connected to the receiving circuit, the second filter circuit and the second selection circuit.

7. The card reading circuit according to claim 1, characterized in that: The sub-second filtering circuit includes a sixth capacitor and a seventh capacitor; The first end of the sixth capacitor and the first end of the seventh capacitor serve together as the first input and output end of the sub-second filter circuit and are connected to the fourth selection circuit. The second end of the sixth capacitor and the second end of the seventh capacitor serve together as the second input and output end of the sub-second filter circuit and are connected to the receiving circuit, the first filter circuit and the second selection circuit.

8. The card reading circuit according to claim 1, characterized in that: The sub-regulation circuit includes a first resistor and a second resistor; The first end of the first resistor and the first end of the second resistor serve together as the first input and output end of the sub-regulation circuit and are connected to the second selection circuit. The second end of the first resistor and the second end of the second resistor serve together as the second input and output end of the sub-regulation circuit and are connected to the first selection circuit.

9. The card reading circuit according to claim 1, characterized in that: The sub-coil circuit includes a coupling coil; The first end of the coupling coil serves as the first input and output end of the sub-coil circuit, and the second end of the coupling coil serves as the second input and output end of the sub-coil circuit. The first end of the coupling coil and the second end of the coupling coil are commonly connected to the first selection circuit.

10. The card reading circuit according to claim 1, characterized in that: The first selection circuit, the second selection circuit, the third selection circuit, and the fourth selection circuit all include a dip switch or an analog switch.

11. An electronic device, characterized in that: The electronic device comprises the card reading circuit as claimed in any one of claims 1 to 10.

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