Circuit of convenient payment terminal

Abstract

The invention discloses a circuit of a convenient payment terminal. The circuit comprises a control chip U11, an IC card identification circuit, a communication circuit and a backlight circuit. Wherein the control chip U11 is respectively connected with the IC card identification circuit, the power supply circuit, the communication circuit and the backlight circuit; the IC card identification circuit is used for identifying an IC card and transmitting the identified IC card data to the control chip U11; the communication circuit is used for remote communication of data, and the backlight circuit is used for displaying IC card data. By means of the payment terminal, identification and data transmission of the IC card can be achieved, remote communication and data display are carried out at the same time, and the intelligence and convenience of equipment are improved. A user can perform payment operation through the IC card, and can conveniently check related information and an operation interface, so that the user experience is improved. The overall effects are that the payment operation is simpler, more convenient and faster, and the usability and convenience of the equipment are improved.

Description

Technical Field

[0001] The invention belongs to the field of communication technology, and in particular relates to a circuit of a convenient payment terminal. Background Art

[0002] The existing payment system belongs to different operators and suppliers. Consumers have to go back and forth between different operators and suppliers to pay bills or handle related business, which consumes a lot of time and energy. With the increasingly fast pace of life today, efficient, fast and convenient services are people's first choice. According to the increasing requirements of users for public utility services, major operators and suppliers need to provide users with convenient and fast payment methods to continuously meet the payment needs of users, thereby reducing customer complaints and improving service quality.

[0003] At present, the general way for residents to pay gas bills is that gas companies first send people to read the meter, calculate the gas fee, and then send the gas bill to the user's mailbox through the post office. The user goes to the bank or gas business hall with the gas bill to queue up to pay the bill, which is very troublesome and time-consuming, and cannot provide 24-hour uninterrupted service. At the same time, since users do not check their mailboxes every day, it is easy for users to not receive the gas bill and fail to pay in time, resulting in gas bill delays. With the development of the gas industry and the continuous expansion of the gas market, the problem of customers' difficulty in paying bills is increasingly troubling gas supply companies. Summary of the invention

[0004] The purpose of the present invention is to provide a circuit for a convenient payment terminal to solve the problem in the prior art proposed in the background technology that users do not check their mailboxes every day, which easily leads to users not receiving gas bills and failing to pay in time, resulting in delayed gas bills.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: A circuit of a convenient payment terminal includes a control chip U11, an IC card recognition circuit, a communication circuit and a backlight circuit; wherein the control chip U11 is connected to the IC card recognition circuit, the power circuit, the communication circuit and the backlight circuit respectively; The IC card identification circuit is used for identifying the IC card and transmitting the identified IC card data to the control chip U11; the communication circuit is used for remote communication of data, and the backlight circuit is used for displaying the IC card data.

[0006] According to the above technical solution, the IC card identification circuit includes capacitor C3, capacitor C91, resistor VR1, resistor VR2, resistor VR3, resistor VR5, diode D24, diode D25, diode D26, diode D27, diode D28 and connector J4; One end of the resistor VR1 is connected to pin 6 of the connector J4; the other end of the resistor VR1 is respectively connected to one end of the diode D24 and pin 94 of the control chip U11, and the other end of the diode D24 is grounded; One end of the resistor VR2 is connected to pin 3 of the connector J4; the other end of the resistor VR2 is respectively connected to the diode D25, one end of the capacitor C91 and pin 92 of the control chip U11, and the other ends of the diode D24 and the capacitor C91 are grounded; One end of the diode D28 is grounded, and the other end of the diode D28 is respectively connected to one end of the resistor VR3 and the pin 93 of the control chip U11; the other end of the resistor VR3 is connected to the pin 5 of the connector J4; One end of the diode D27 is grounded, and the other end of the diode D27 is connected to the pin 96 of the control chip U11; One end of the diode D26 is grounded, the other end of the diode D26 is respectively connected to one end of the resistor VR5, the transistor Q8, the capacitor C100 and one end of the capacitor C53, and the other end of the resistor VR5 is connected to pin 2 of the connector J4.

[0007] According to the above technical solution, the IC card identification circuit also includes a resistor R96, a transistor Q8, a capacitor C53 and a capacitor C100; One end of resistor R96 is connected to pin 95 of control chip U11, the other end of resistor R96 is connected to the base of transistor Q8, the emitter of transistor Q8 is connected to the power supply, the collector of transistor Q8 is connected to one end of capacitor C100 and capacitor C53 respectively, and the other end of capacitor C100 and the other end of capacitor C53 are grounded.

[0008] According to the above technical solution, the communication circuit includes a connector J2, a resistor RT1, a resistor R2, a resistor R3, a resistor R5, a resistor R6, a resistor R9, a resistor R13, a diode D2, a capacitor C1, a chip U5, a chip U1 and a chip U3; Pin 1 of connector J2 is connected to one end of resistor RT1, and the other end of resistor RT1 is respectively connected to diode D2, one end of resistor R9 and pin 6 of chip U5; the other end of resistor R9 is connected to the power supply; Pin 2 of connector J2 is respectively connected to the other end of diode D2, one end of resistor R13 and pin 7 of chip U5; the other end of resistor R13 is connected to the power supply; Pin 5 of chip U5 is connected to the power supply; Pin 8 of chip U5 is connected to the power supply and one end of capacitor C1 respectively, and the other end of capacitor C1 is connected to the power supply; Pin 1 of chip U5 is connected to pin 2 of chip U3; pin 2 of chip U5 is connected to pin 3 of chip U5, one end of resistor R6 and pin 3 of chip U1 respectively; Pin 1 of chip U3 is connected to one end of resistor R5, and the other end of resistor R5 is connected to the power supply; Pin 3 of chip U3 is connected, and pin 4 of chip U3 is respectively connected to one end of resistor R2 and pin 171 of control chip U11; Pin 4 of chip U5 is connected to the other end of resistor R6; Pin No. 4 of chip U1 is connected to the power supply; Pin No. 1 of chip U1 is connected to one end of resistor R3, and the other end of resistor R3 is connected to the power supply; Pin No. 2 of chip U1 is connected to pin No. 172 of control chip U11.

[0009] According to the above technical solution, the resistor RT1 is a thermistor, and the diode D2 is a bidirectional trigger diode.

[0010] According to the above technical solution, the backlight circuit includes a chip U21, an inductor L1, a capacitor C10, a capacitor C131, a capacitor C20, a capacitor C30, a capacitor C31, a capacitor C51, a diode D15, a diode D8, a diode D5, a diode D18 and a resistor R24; Pin 5 of chip U21 is connected to capacitor C10, capacitor C131 and one end of inductor L1 respectively; the other end of capacitor C10 is connected to the other end of capacitor C131; the other end of inductor L1 is connected to capacitor C20, one end of diode D18 and pin 1 of chip U21 respectively; Pin 4 of chip U21 is connected to pin 22 of control chip U11; The other end of capacitor C20 is connected to one end of diode D15 and diode D8 respectively; the other end of diode D15 is connected to one end of capacitor C30, capacitor C31, capacitor C51 and resistor R24 ​​respectively; the other end of diode D8 is connected to the other end of capacitor C30 and one end of diode D5 respectively, and the other end of diode D5 is connected to the other end of capacitor C31, capacitor C51 and resistor R24.

[0011] According to the above technical solution, the backlight circuit further includes a resistor R60, a resistor R61, a resistor R66, a capacitor C11, a capacitor C31, a capacitor C33, a capacitor C50, a capacitor C65, and a diode D9; The other end of the diode D8 is connected to the resistor R60, the capacitor C32, the capacitor C65, the capacitor C11 and one end of the diode D9; the other end of the diode D9 is connected to one end of the capacitor C33 and the capacitor C50 respectively; the other end of the capacitor C50 is connected to the other end of the capacitor C33, the capacitor C11, the capacitor C65 and the capacitor C32 respectively; The other end of the resistor R60 is connected to one end of the resistor R61, and the other end of the resistor R61 is respectively connected to one end of the resistor R66 and the pin 3 of the chip U21; the other end of the resistor R66 is connected to the pin 2 of the chip U21; The other end of the resistor R66 and the chip U21 are also grounded.

[0012] According to the above technical solution, the backlight circuit further includes: chip U10, capacitor C16, capacitor C129, inductor L8, diode D6, resistor R21, resistor R25, capacitor C34 and capacitor C13; Pin 5 of chip U10 is connected to capacitor C16, capacitor C129, one end of inductor L8 and a power source; the other end of capacitor C16 is connected to the other end of capacitor C129; the other end of inductor L8 is respectively connected to diode D16 and pin 1 of chip U10; the other end of diode D16 is respectively connected to resistor R21, capacitor C34 and one end of capacitor C13; The other end of capacitor C13 is connected to the other end of capacitor C34; the other end of resistor R21 is connected to pin 3 of chip U10 and one end of resistor R25 respectively; the other end of resistor R25 is connected to pin 2 of chip U10.

[0013] According to the above technical solution, the other end of the capacitor C16 and the other end of the capacitor C129 are both grounded.

[0014] According to the above technical solution, the other end of the resistor R25 and the pin 2 of the chip U10 are both grounded; the other ends of the capacitor C34 and the capacitor C13 are both grounded.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The payment terminal of the present invention can realize the recognition and data transmission of IC cards, and can also perform remote communication and data display, which improves the intelligence and convenience of the equipment. Users can pay fees through IC cards, and can conveniently view relevant information and operation interfaces, which improves the user experience. The overall effect is to make the payment operation simpler and faster, and improve the usability and convenience of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the control chip of the present invention; Figure 2It is the IC card identification circuit diagram of the present invention; Figure 3 This is a backlight circuit diagram of the present invention; Figure 4 This is a control communication circuit diagram of the present invention; Figure 5 This is a key feedback circuit diagram of the present invention; Figure 6 The circuit diagram of chip U23 of the voice prompt circuit of the present invention; Figure 7 This is a first voice prompt circuit diagram of the present invention; Figure 8 This is a second voice prompt circuit diagram of the present invention; Fig. 9 For the present invention Figure 4 A local enlarged view of point A in FIG. Fig.10 For the present invention Figure 4 A partial enlarged view of point B in FIG. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] Embodiment 1 like Figures 1 to 4 As shown, a circuit of a convenient payment terminal includes a control chip U11, an IC card recognition circuit, a communication circuit and a backlight circuit; wherein the control chip U11 is connected to the IC card recognition circuit, the power circuit, the communication circuit and the backlight circuit respectively; The IC card identification circuit is used for identifying the IC card and transmitting the identified IC card data to the control chip U11; the communication circuit is used for remote communication of data, and the backlight circuit is used for displaying the IC card data.

[0019] The payment terminal of the present invention can realize the recognition and data transmission of IC cards, and can also perform remote communication and data display, which improves the intelligence and convenience of the equipment. Users can pay fees through IC cards, and can conveniently view relevant information and operation interfaces, which improves the user experience. The overall effect is to make the payment operation simpler and faster, and improve the usability and convenience of the equipment.

[0020] Embodiment 2 This embodiment is a further refinement of the first embodiment.

[0021] like Figure 2 As shown, the IC card identification circuit includes capacitor C3, capacitor C91, resistor VR1, resistor VR2, resistor VR3, resistor VR5, diode D24, diode D25, diode D26, diode D27, diode D28 and connector J4; One end of the resistor VR1 is connected to pin 6 of the connector J4; the other end of the resistor VR1 is respectively connected to one end of the diode D24 and pin 94 of the control chip U11, and the other end of the diode D24 is grounded; like Figure 2 As shown, one end of the resistor VR2 is connected to the pin 3 of the connector J4; the other end of the resistor VR2 is respectively connected to the diode D25, one end of the capacitor C91 and the pin 92 of the control chip U11, and the other end of the diode D24 and the capacitor C91 are grounded; One end of the diode D28 is grounded, and the other end of the diode D28 is respectively connected to one end of the resistor VR3 and the pin 93 of the control chip U11; the other end of the resistor VR3 is connected to the pin 5 of the connector J4; One end of the diode D27 is grounded, and the other end of the diode D27 is connected to the pin 96 of the control chip U11; One end of the diode D26 is grounded, the other end of the diode D26 is respectively connected to one end of the resistor VR5, the transistor Q8, the capacitor C100 and one end of the capacitor C53, and the other end of the resistor VR5 is connected to pin 2 of the connector J4.

[0022] The IC card identification circuit also includes a resistor R96, a transistor Q8, a capacitor C53 and a capacitor C100; One end of resistor R96 is connected to pin 95 of control chip U11, the other end of resistor R96 is connected to the base of transistor Q8, the emitter of transistor Q8 is connected to the power supply, the collector of transistor Q8 is connected to one end of capacitor C100 and capacitor C53 respectively, and the other end of capacitor C100 and the other end of capacitor C53 are grounded.

[0023] like Figure 4 , Fig. 9 as well as Fig.10 As shown, the communication circuit includes a connector J2, a resistor RT1, a resistor R2, a resistor R3, a resistor R5, a resistor R6, a resistor R9, a resistor R13, a diode D2, a capacitor C1, a chip U5, a chip U1 and a chip U3; like Fig.10 As shown, pin 1 of connector J2 is connected to one end of resistor RT1, and the other end of resistor RT1 is respectively connected to diode D2, one end of resistor R9 and pin 6 of chip U5; the other end of resistor R9 is connected to the power supply; Pin 2 of connector J2 is respectively connected to the other end of diode D2, one end of resistor R13 and pin 7 of chip U5; the other end of resistor R13 is connected to the power supply; Pin 5 of chip U5 is connected to the power supply; Pin 8 of chip U5 is connected to the power supply and one end of capacitor C1 respectively, and the other end of capacitor C1 is connected to the power supply; Pin 1 of chip U5 is connected to pin 2 of chip U3; pin 2 of chip U5 is connected to pin 3 of chip U5, one end of resistor R6 and pin 3 of chip U1 respectively; like Fig. 9 As shown, pin 1 of chip U3 is connected to one end of resistor R5, and the other end of resistor R5 is connected to the power supply; pin 3 of chip U3 is connected, and pin 4 of chip U3 is respectively connected to one end of resistor R2 and pin 171 of control chip U11; Pin 4 of chip U5 is connected to the other end of resistor R6; Pin No. 4 of chip U1 is connected to the power supply; Pin No. 1 of chip U1 is connected to one end of resistor R3, and the other end of resistor R3 is connected to the power supply; Pin No. 2 of chip U1 is connected to pin No. 172 of control chip U11.

[0024] The resistor RT1 is a thermistor, and the diode D2 is a bidirectional trigger diode.

[0025] like Figure 3 As shown, the backlight circuit includes a chip U21, an inductor L1, a capacitor C10, a capacitor C131, a capacitor C20, a capacitor C30, a capacitor C31, a capacitor C51, a diode D15, a diode D8, a diode D5, a diode D18 and a resistor R24; Pin 5 of chip U21 is connected to capacitor C10, capacitor C131 and one end of inductor L1 respectively; the other end of capacitor C10 is connected to the other end of capacitor C131; the other end of inductor L1 is connected to capacitor C20, one end of diode D18 and pin 1 of chip U21 respectively; Pin 4 of chip U21 is connected to pin 22 of control chip U11; The other end of capacitor C20 is connected to one end of diode D15 and diode D8 respectively; the other end of diode D15 is connected to one end of capacitor C30, capacitor C31, capacitor C51 and resistor R24 ​​respectively; the other end of diode D8 is connected to the other end of capacitor C30 and one end of diode D5 respectively, and the other end of diode D5 is connected to the other end of capacitor C31, capacitor C51 and resistor R24.

[0026] The backlight circuit also includes a resistor R60, a resistor R61, a resistor R66, a capacitor C11, a capacitor C31, a capacitor C33, a capacitor C50, a capacitor C65, and a diode D9; The other end of the diode D8 is connected to the resistor R60, the capacitor C32, the capacitor C65, the capacitor C11 and one end of the diode D9; the other end of the diode D9 is connected to one end of the capacitor C33 and the capacitor C50 respectively; the other end of the capacitor C50 is connected to the other end of the capacitor C33, the capacitor C11, the capacitor C65 and the capacitor C32 respectively; The other end of the resistor R60 is connected to one end of the resistor R61, and the other end of the resistor R61 is respectively connected to one end of the resistor R66 and the pin 3 of the chip U21; the other end of the resistor R66 is connected to the pin 2 of the chip U21; The other end of the resistor R66 and the chip U21 are also grounded.

[0027] The backlight circuit also includes: chip U10, capacitor C16, capacitor C129, inductor L8, diode D6, resistor R21, resistor R25, capacitor C34 and capacitor C13; Pin 5 of chip U10 is connected to capacitor C16, capacitor C129, one end of inductor L8 and a power source; the other end of capacitor C16 is connected to the other end of capacitor C129; the other end of inductor L8 is respectively connected to diode D16 and pin 1 of chip U10; the other end of diode D16 is respectively connected to resistor R21, capacitor C34 and one end of capacitor C13; The other end of capacitor C13 is connected to the other end of capacitor C34; the other end of resistor R21 is connected to pin 3 of chip U10 and one end of resistor R25 respectively; the other end of resistor R25 is connected to pin 2 of chip U10.

[0028] The other end of the capacitor C16 and the other end of the capacitor C129 are both grounded.

[0029] The other end of the resistor R25 and the pin 2 of the chip U10 are both grounded; the other ends of the capacitor C34 and the capacitor C13 are both grounded.

[0030] like Figure 5As shown, the circuit of the convenient payment terminal also includes a key feedback circuit, which includes a chip U9, a key K1, a key K2, a key K3, a key K4, a key K5, a key K6, a resistor R34, a resistor R37, a resistor R35, a resistor R38, a resistor R36, a resistor R45, a capacitor C14, a capacitor C21, a capacitor C106 and a capacitor C105; wherein, pin No. 2 of the chip U9 is connected to one end of the capacitor C21, and pin No. 3 of the chip U9 is connected to one end of the capacitor C14; the other ends of the capacitor C14 and the capacitor C21 and pin No. 1 of the chip U9 are all grounded.

[0031] Pin No. 4 of the chip U9 is connected to one end of the resistor R34, and the other end of the resistor R34 is connected to the button K6.

[0032] Pin No. 5 of the chip U9 is connected to one end of the resistor R37, and the other end of the resistor R37 is connected to the button K5.

[0033] Pin No. 6 of the chip U9 is connected to one end of the resistor R35, and the other end of the resistor R35 is connected to the button K4.

[0034] Pin No. 7 of the chip U9 is connected to one end of the resistor R38, and the other end of the resistor R38 is connected to the button K3.

[0035] Pin No. 8 of the chip U9 is connected to one end of the resistor R36, and the other end of the resistor R36 is connected to the button K2.

[0036] Pin No. 9 of the chip U9 is connected to one end of the resistor R45, and the other end of the resistor R45 is connected to the button K1.

[0037] Pins 10 to 15 of chip U9 are connected to pins 122 to 117 of chip U11 respectively.

[0038] Pin No. 16 of the chip U9 is connected to one end of the capacitor C106 and one end of the capacitor C105 respectively, and the other ends of the capacitor C106 and the capacitor C105 are connected, and the capacitor C106 and the capacitor C105 are both grounded.

[0039] like Figures 6 to 8 As shown, the circuit of the convenient payment terminal also includes a voice prompt circuit; the voice prompt circuit includes a chip U23, a first voice circuit and a second voice circuit; wherein the first voice circuit and the second voice circuit are respectively connected to the chip U23; like Figure 7As shown, the first voice circuit includes a chip U24, an output device S1, a capacitor C94, a capacitor C95, a capacitor C101, a capacitor C102, a resistor R20 and a resistor R26; wherein, the pin No. 1 of the chip U24 is connected to the pin No. 90 of the chip U11; the pin No. 2 of the chip U24 is respectively connected to one end of the capacitor C94 and the pin No. 3 of the chip U24; the other end of the capacitor C94 is grounded; Pin No. 4 of chip U24 is connected to one end of resistor R20 and resistor R26 respectively; the other end of resistor R20 is connected to one end of capacitor C102, and the other end of capacitor C102 is connected to pin No. 29 of chip U23; the other end of resistor R26 is connected to pin No. 5 of chip U24; pin No. 6 of chip U24 is connected to one end of capacitor C95, capacitor C101 and power supply respectively; the other ends of capacitor C95 and capacitor C101 are both grounded; Pin No. 7 of the chip U24 is grounded; Pin No. 8 of the chip U24 is connected to Pin No. 1 of the output device S1; Pin No. 2 of the output device S1 is connected to Pin No. 5 of the chip U24.

[0040] like Figure 8 As shown, the second voice circuit includes a chip U28, an output device S2, a capacitor C119, a capacitor C120, a capacitor C1121, a capacitor C122, a resistor R28 and a resistor R29; wherein, the pin No. 1 of the chip U28 is connected to the pin No. 90 of the chip U11; the pin No. 2 of the chip U28 is respectively connected to one end of the capacitor C119 and the pin No. 3 of the chip U28; the other end of the capacitor C119 is grounded; Pin 4 of chip U28 is connected to one end of resistor R28 and one end of resistor R29 respectively; the other end of resistor R28 is connected to one end of capacitor C122, and the other end of capacitor C102 is connected to pin 30 of chip U23; the other end of resistor R29 is connected to pin 5 of chip U28; pin 6 of chip U28 is connected to one end of capacitor C120, one end of capacitor C121 and a power supply respectively; the other ends of capacitor C120 and capacitor C121 are both grounded; Pin No. 7 of chip U28 is grounded; Pin No. 8 of chip U28 is connected to Pin No. 1 of output device S2; Pin No. 2 of output device S2 is connected to Pin No. 5 of chip U28.

[0041] The working principle of the present invention is as follows: insert the electric card into the slot J4; the chip U11 controls the power supply module to supply power to the electric card through the pin 95 (one end of the resistor R96); Pin 22 of chip U11 controls chip U21 and chip U10 to generate the positive and negative power required for the display screen, keep the screen always on, give the user operation prompts, and prompt the user to operate through the set button feedback circuit and voice prompt circuit.

[0042] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0043] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A circuit of a convenient payment terminal, characterized in that: It includes a control chip U11, an IC card recognition circuit, a communication circuit and a backlight circuit; wherein the control chip U11 is connected to the IC card recognition circuit, the power circuit, the communication circuit and the backlight circuit respectively; The IC card identification circuit is used for identifying the IC card and transmitting the identified IC card data to the control chip U11; the communication circuit is used for remote communication of data, and the backlight circuit is used for displaying the IC card data.

2. The circuit of the convenient payment terminal according to claim 1 is characterized in that: The IC card identification circuit includes a capacitor C91, a resistor VR1, a resistor VR2, a resistor VR3, a resistor VR5, a diode D24, a diode D25, a diode D26, a diode D27, a diode D28 and a connector J4; One end of the resistor VR1 is connected to pin 6 of the connector J4; the other end of the resistor VR1 is respectively connected to one end of the diode D24 and pin 94 of the control chip U11, and the other end of the diode D24 is grounded; One end of the resistor VR2 is connected to pin 3 of the connector J4; the other end of the resistor VR2 is respectively connected to the diode D25, one end of the capacitor C91 and pin 92 of the control chip U11, and the other ends of the diode D24 and the capacitor C91 are grounded; One end of the diode D28 is grounded, and the other end of the diode D28 is respectively connected to one end of the resistor VR3 and the pin 93 of the control chip U11; the other end of the resistor VR3 is connected to the pin 5 of the connector J4; One end of the diode D27 is grounded, and the other end of the diode D27 is connected to the pin 96 of the control chip U11; One end of the diode D26 is grounded, and the other end of the diode D26 is respectively connected to one end of the resistor VR5, the transistor Q8, the capacitor C100 and one end of the capacitor C53; the other end of the resistor VR5 is connected to pin 2 of the connector J4.

3. The circuit of a convenient payment terminal according to claim 1, characterized in that: The IC card identification circuit also includes a resistor R96, a transistor Q8, a capacitor C53 and a capacitor C100; One end of resistor R96 is connected to pin 95 of control chip U11, the other end of resistor R96 is connected to the base of transistor Q8, the emitter of transistor Q8 is connected to the power supply, the collector of transistor Q8 is connected to one end of capacitor C100 and capacitor C53 respectively, and the other end of capacitor C100 and the other end of capacitor C53 are grounded.

4. The circuit of a convenient payment terminal according to claim 1, characterized in that: The communication circuit includes a connector J2, a resistor RT1, a resistor R2, a resistor R3, a resistor R5, a resistor R6, a resistor R9, a resistor R13, a diode D2, a capacitor C1, a chip U5, a chip U1 and a chip U3; Pin 1 of connector J2 is connected to one end of resistor RT1, and the other end of resistor RT1 is respectively connected to diode D2, one end of resistor R9 and pin 6 of chip U5; the other end of resistor R9 is connected to the power supply; Pin 2 of connector J2 is respectively connected to the other end of diode D2, one end of resistor R13 and pin 7 of chip U5; the other end of resistor R13 is connected to the power supply; Pin 5 of chip U5 is connected to the power supply; Pin 8 of chip U5 is connected to the power supply and one end of capacitor C1 respectively, and the other end of capacitor C1 is connected to the power supply; Pin 1 of chip U5 is connected to pin 2 of chip U3; pin 2 of chip U5 is connected to pin 3 of chip U5, one end of resistor R6 and pin 3 of chip U1 respectively; Pin 1 of chip U3 is connected to one end of resistor R5, and the other end of resistor R5 is connected to the power supply; Pin 3 of chip U3 is connected, and pin 4 of chip U3 is respectively connected to one end of resistor R2 and pin 171 of control chip U11; Pin 4 of chip U5 is connected to the other end of resistor R6; Pin No. 4 of chip U1 is connected to the power supply; Pin No. 1 of chip U1 is connected to one end of resistor R3, and the other end of resistor R3 is connected to the power supply; Pin No. 2 of chip U1 is connected to pin No. 172 of control chip U11.

5. The circuit of the convenient payment terminal according to claim 4 is characterized in that: The resistor RT1 is a thermistor, and the diode D2 is a bidirectional trigger diode.

6. The circuit of a convenient payment terminal according to claim 1, characterized in that: The backlight circuit includes a chip U21, an inductor L1, a capacitor C10, a capacitor C131, a capacitor C20, a capacitor C30, a capacitor C31, a capacitor C51, a diode D15, a diode D8, a diode D5, a diode D18 and a resistor R24; Pin 5 of chip U21 is connected to capacitor C10, capacitor C131 and one end of inductor L1 respectively; the other end of capacitor C10 is connected to the other end of capacitor C131; the other end of inductor L1 is connected to capacitor C20, one end of diode D18 and pin 1 of chip U21 respectively; Pin 4 of chip U21 is connected to pin 22 of control chip U11; The other end of capacitor C20 is connected to one end of diode D15 and diode D8 respectively; the other end of diode D15 is connected to one end of capacitor C30, capacitor C31, capacitor C51 and resistor R24 ​​respectively; the other end of diode D8 is connected to the other end of capacitor C30 and one end of diode D5 respectively, and the other end of diode D5 is connected to the other end of capacitor C31, capacitor C51 and resistor R24.

7. The circuit of the convenient payment terminal according to claim 6 is characterized in that: The backlight circuit also includes a resistor R60, a resistor R61, a resistor R66, a capacitor C11, a capacitor C31, a capacitor C33, a capacitor C50, a capacitor C65, and a diode D9; The other end of the diode D8 is connected to the resistor R60, the capacitor C32, the capacitor C65, the capacitor C11 and one end of the diode D9; the other end of the diode D9 is connected to one end of the capacitor C33 and the capacitor C50 respectively; the other end of the capacitor C50 is connected to the other end of the capacitor C33, the capacitor C11, the capacitor C65 and the capacitor C32 respectively; The other end of the resistor R60 is connected to one end of the resistor R61, and the other end of the resistor R61 is respectively connected to one end of the resistor R66 and the pin 3 of the chip U21; the other end of the resistor R66 is connected to the pin 2 of the chip U21; The resistor R66 and the chip U21 are both grounded.

8. The circuit of the convenient payment terminal according to claim 7 is characterized in that: The backlight circuit also includes: chip U10, capacitor C16, capacitor C129, inductor L8, diode D6, resistor R21, resistor R25, capacitor C34 and capacitor C13; Pin 5 of chip U10 is connected to capacitor C16, capacitor C129, one end of inductor L8 and a power source; the other end of capacitor C16 is connected to the other end of capacitor C129; the other end of inductor L8 is respectively connected to diode D16 and pin 1 of chip U10; the other end of diode D16 is respectively connected to resistor R21, capacitor C34 and one end of capacitor C13; The other end of capacitor C13 is connected to the other end of capacitor C34; the other end of resistor R21 is connected to pin 3 of chip U10 and one end of resistor R25 respectively; the other end of resistor R25 is connected to pin 2 of chip U10.

9. The circuit of the convenient payment terminal according to claim 8, characterized in that: The other end of the capacitor C16 and the other end of the capacitor C129 are both grounded.

10. The circuit of the convenient payment terminal according to claim 8, characterized in that: The other end of the resistor R25 and the pin 2 of the chip U10 are both grounded; the other ends of the capacitor C34 and the capacitor C13 are both grounded.

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