CN213879812U

CN213879812U - A double-circuit SIM card communication switching circuit for battery charging outfit

Info

Publication number: CN213879812U
Application number: CN202120218220.7U
Authority: CN
Inventors: 郭黎青; 王晨光; 张克贺
Original assignee: Qingdao Huashuo Gaoke New Energy Technology Co ltd
Current assignee: Qingdao Huashuo Gaoke New Energy Technology Co ltd
Priority date: 2021-01-27
Filing date: 2021-01-27
Publication date: 2021-08-03
Anticipated expiration: 2031-01-27

Abstract

The utility model provides a double-circuit SIM card communication switching circuit for charging equipment, which belongs to the technical field of double-SIM communication switching circuits, and comprises a singlechip, a switching chip U1, a current-limiting pull-up resistor and two SIM card seats; the GPIO of the single chip microcomputer is electrically connected with a second pin of the switching chip U1 through a capacitor C9, and the other end of the capacitor C9 is electrically connected with a GND wire grounding end and used for inputting a communication circuit switching signal to the switching chip U1; SIM cassette quantity is two, two chip SIM1 and chip SIM2 are installed respectively to the inside of SIM cassette, the embodiment of the utility model provides a only need one to switch the chip and can realize the connection and the switching of communication module and two independent SIM chips to do not need the level conversion, can lug connection communication module and singlechip, and the circuit is simple, has promoted anti-interference electrostatic protection ability through setting up two ESD electrostatic protection chips.

Description

A double-circuit SIM card communication switching circuit for battery charging outfit

Technical Field

The utility model discloses two SIM communication switching circuit technical field particularly, relate to a double-circuit SIM card communication switching circuit for battery charging outfit.

Background

At present, communication interfaces of many charging devices are designed by only one SIM card, that is, only one SIM card can be inserted into one 4G communication module. However, in practical use, when one SIM card is defaulted or otherwise abnormal, data communication is lost, and another SIM card is required to perform data exchange. If a two-way communication gateway is additionally arranged, the problems of high cost and complex process connection are caused.

SUMMERY OF THE UTILITY MODEL

In order to compensate above not enough, the utility model provides a double-circuit SIM card communication switching circuit for battery charging outfit aims at solving current battery charging outfit communication interface and has only a SIM card, when a SIM card arrearages or other unusual, data communication will lose, just needs another way SIM card can carry out data exchange's problem.

The utility model discloses a realize like this:

the utility model provides a double-circuit SIM card communication switching circuit for charging equipment, which comprises a singlechip, a switching chip U1, a current-limiting pull-up resistor and an SIM card seat;

the GPIO of the single chip microcomputer is electrically connected with a second pin of the switching chip U1 through a capacitor C9, and the other end of the capacitor C9 is electrically connected with a GND wire grounding end and used for inputting a communication circuit switching signal to the switching chip U1;

the number of the SIM card seats is two, a chip SIM1 and a chip SIM2 are respectively installed in the two SIM card seats, and the chip SIM1 and the chip SIM2 are electrically connected with the switching chip U1 through the current-limiting pull-up resistor and are used for receiving the communication control signal output by the switching chip U1.

In an embodiment of the present invention, the current-limiting pull-up resistor includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, and a resistor R8.

In an embodiment of the present invention, the first pin of the switching chip U1 is electrically connected with a capacitor C1, the first pin and the second pin of the chip SIM1 are respectively electrically connected with both ends of the capacitor C1, and the other end of the capacitor C1 is electrically connected with the GND wire ground, the thirteenth pin, the ninth pin and the fifth pin of the switching chip U1 are respectively electrically connected with one end of the resistor R2, the resistor R3 and the resistor R4, and the other end of the switching chip U8938 is respectively electrically connected with the sixth pin, the fifth pin and the third pin of the chip SIM 1.

In an embodiment of the present invention, the ESD protection device further comprises an ESD protection chip U2, the first pin of the ESD protection chip U2 is electrically connected to one end of the capacitor C1, the second pin of the ESD protection chip U2 is electrically connected to the GND wire ground, the third pin of the ESD electrostatic protection chip U2 is electrically connected with the first pin of the switching chip U1, the resistor R1, the resistor R2 and one end of a capacitor C2, the other end of the capacitor C2 is electrically connected with the ground end of a GND wire to form a loop, the resistor R3 and the resistor R4 are electrically connected with a capacitor C3 and a capacitor C4, the capacitor C3 and the capacitor C4 are both electrically connected with GND wire ground, the fourth pin and the fifth pin of the ESD electrostatic protection chip U2 are respectively electrically connected with the third pin and the sixth pin of the chip SIM1, and the ninth pin and the tenth pin of the chip SIM1 are electrically connected with an EARTH lightning protection grounding terminal.

In an embodiment of the present invention, the capacitance C5 is electrically connected to the fifteenth pin of the switching chip U1, the first pin and the second pin of the chip SIM1 are electrically connected to both ends of the capacitance C5, respectively, and the other end of the capacitance C5 is electrically connected to the GND wire ground, the eleventh pin, the seventh pin and the third pin of the switching chip U1 are electrically connected to one end of the resistance R6, the resistance R7 and the resistance R8, respectively, and the other end of the switching chip U1 is electrically connected to the sixth pin, the fifth pin and the third pin of the chip SIM1, respectively.

In an embodiment of the present invention, the ESD protection device further comprises an ESD protection chip U3, the first pin of the ESD protection chip U3 is electrically connected to one end of the capacitor C5, the second pin of the ESD protection chip U3 is electrically connected to the GND wire ground, the third pin of the ESD electrostatic protection chip U3 is electrically connected to the fifteenth pin of the switching chip U1, the resistor R5, the resistor R6 and one end of a capacitor C6, the other end of the capacitor C6 is electrically connected with the ground end of a GND wire to form a loop, the resistor R7 and the resistor R8 are electrically connected with a capacitor C7 and a capacitor C8, the capacitor C7 and the capacitor C8 are both electrically connected with GND wire ground, the fourth pin and the fifth pin of the ESD electrostatic protection chip U2 are respectively connected with the third pin and the sixth pin of the chip SIM2, and the ninth pin and the tenth pin of the chip SIM1 are electrically connected with an EARTH lightning protection grounding terminal.

In an embodiment of the present invention, the model of the switching chip U1 is FSA2567MPX, and the models of the ESD electrostatic protection chip U2 and the ESD electrostatic protection chip U3 are ESDA6V1W 5.

In an embodiment of the present invention, the two models of the SIM card holder are SIMCARD _ C720.

In an embodiment of the present invention, the resistor R1 and the resistor R5 are 15K resistors, the resistor R2, the resistor R3, the resistor R4, the resistor R6, the resistor R7, the resistor R8 are 22 Ω resistors.

In an embodiment of the present invention, the capacitor C1 and the capacitor C5 are both 100nF capacitors, and the capacitor C2, the capacitor C3, the capacitor C4, the capacitor C6, the capacitor C7, the capacitor C8 are both 33pF capacitors.

Compared with the prior art, the beneficial effects of the utility model are that: the embodiment of the utility model provides a only need one to switch the chip and can realize the connection and the switching of communication module and two independent SIM chips to do not need level conversion, can lug connection communication module and singlechip, and the circuit is simple, has promoted anti-interference electrostatic protection ability through setting up two ESD electrostatic protection chips.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a circuit diagram of a switching chip U1 of a two-way SIM card communication switching circuit for a charging device according to an embodiment of the present invention;

fig. 2 is a circuit diagram of a chip SIM1 of a two-way SIM card communication switching circuit for a charging device according to an embodiment of the present invention;

fig. 3 is a circuit diagram of a chip SIM2 of a two-way SIM card communication switching circuit for a charging device according to an embodiment of the present invention.

Description of reference numerals: a 1-single chip microcomputer, b 1-switching chip U1, c 1-current limiting pull-up resistor, d1-SIM card seat, d 11-chip SIM1 and d 12-chip SIM 2.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined to clearly and completely describe the technical solutions of the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

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

Examples

Referring to the attached drawings 1-3, the utility model provides a technical scheme: a two-way SIM card communication switching circuit for charging equipment comprises a singlechip a1, a switching chip U1b1, a current-limiting pull-up resistor c1 and a SIM card seat d 1;

the GPIO of the singlechip a1 is electrically connected with a second pin of the switching chip U1b1 through a capacitor C9, and the other end of the capacitor C9 is electrically connected with a GND wire grounding end and is used for inputting a communication circuit switching signal to the switching chip U1b 1; the number of the SIM card holders d1 is two, the chip SIM1d11 and the chip SIM2d12 are respectively installed inside the two SIM card holders d1, and the chip SIM1d11 and the chip SIM2d12 are electrically connected with the switching chip U1b1 through a current-limiting pull-up resistor c1, and are used for receiving the communication control signal output by the switching chip U1b 1.

In the embodiment, the single chip microcomputer a1 sends a communication circuit switching signal to the switching chip U1b1, and the switching chip U1b1 sends a communication control signal to the chip SIM1d11 or the chip SIM2d 12.

As an embodiment of the present invention, further, the current-limiting pull-up resistor c1 includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, and a resistor R8.

As an embodiment of the present invention, further, the first pin of the switching chip U1b1 is electrically connected to a capacitor C1, the first pin and the second pin of the chip SIM1d11 are electrically connected to both ends of the capacitor C1, respectively, and the other end of the capacitor C1 is electrically connected to the GND wire ground, the thirteenth pin, the ninth pin and the fifth pin of the switching chip U1b1 are electrically connected to one ends of a resistor R2, a resistor R3 and a resistor R4, and the other end of the switching chip U1b1 is electrically connected to the sixth pin, the fifth pin and the third pin of the chip SIM1d11, respectively; when the chip SIM1d11 works, the switching chip U1b1 inputs communication control signals to the chip SIM1d11, the resistor R1, the resistor R2, the resistor R3 and the resistor R4 clamp the uncertain signals in the channel 1 at a high level, and play a role in limiting the input current, and simultaneously, the channel 1 signals are filtered through the capacitor C1, the capacitor C2, the capacitor C3 and the capacitor C4, so that the uncertain signals can be prevented from generating interference.

As an embodiment of the present invention, further, the ESD protection device further includes an ESD protection chip U2, a first pin of the ESD protection chip U2 is electrically connected to one end of the capacitor C1, a second pin of the ESD protection chip U2 is electrically connected to a GND wire ground, a third pin of the ESD protection chip U2 is electrically connected to a first pin of the switching chip U1b1, a resistor R1, one ends of a resistor R2 and a capacitor C2, and the other end of the capacitor C2 is electrically connected to the GND wire ground to form a loop, a resistor R3 and a resistor R4 are electrically connected to a capacitor C3 and a capacitor C4, a capacitor C3 and a capacitor C4 are both electrically connected to the GND wire ground, a fourth pin and a fifth pin of the ESD protection chip U2 are electrically connected to a third pin and a sixth pin of the chip SIM1d11, and a ninth pin and a tenth pin of the SIM1d11 are electrically connected to an EARTH ground; when the chip SIM1d11 works, the ESD protection chip U2 provides electrostatic protection for the channel 1, and avoids damage to components in the channel 1 due to high current.

As an embodiment of the present invention, further, the capacitance C5 is electrically connected to the fifteenth pin of the switching chip U1b1, the first pin and the second pin of the chip SIM1d11 are electrically connected to both ends of the capacitance C5, respectively, and the other end of the capacitance C5 is electrically connected to the GND wire ground, the eleventh pin, the seventh pin and the third pin of the switching chip U1b1 are electrically connected to one end of the resistance R6, the resistance R7 and the resistance R8, and the other end of the switching chip U1b1 is electrically connected to the sixth pin, the fifth pin and the third pin of the chip SIM1d11, respectively; when the chip SIM2d12 works, the switching chip U1b1 inputs communication control signals to the chip SIM2d12, the resistor R5, the resistor R6, the resistor R7 and the resistor R8 clamp the uncertain signals in the channel 2 at a high level, and play a role in limiting the input current, and simultaneously, the channel 2 signals are filtered through the capacitor C5, the capacitor C6, the capacitor C7 and the capacitor C8, so that the uncertain signals can be prevented from generating interference.

As an embodiment of the present invention, further, still include ESD electrostatic protection chip U3, the first pin of ESD electrostatic protection chip U3 is electrically connected with the one end of electric capacity C5, the second pin of ESD electrostatic protection chip U3 is electrically connected with GND wire ground, the third pin of ESD electrostatic protection chip U3 is electrically connected with the fifteenth pin of switching chip U1b1, resistance R5, resistance R6 and one end of electric capacity C6, and the other end of electric capacity C6 is electrically connected with GND wire ground to form a loop, resistance R7 and resistance R8 are electrically connected with electric capacity C7 and electric capacity C8, electric capacity C7 and electric capacity C8 are all electrically connected with GND wire ground, the fourth pin and the fifth pin of ESD electrostatic protection chip U2 are respectively connected with the third pin and the sixth pin of chip SIM2d12, the ninth pin and the tenth pin of chip SIM1d11 are electrically connected with the ground.

As an embodiment of the present invention, further, the model of the switching chip U1b1 is FSA2567MPX, and the models of the ESD electrostatic protection chip U2 and the ESD electrostatic protection chip U3 are ESDA6V1W 5.

As an embodiment of the present invention, further, the model number of the two SIM card sockets d1 is SIMCARD _ C720.

As an embodiment of the present invention, further, the resistor R1 and the resistor R5 are both 15K resistors, and the resistor R2, the resistor R3, the resistor R4, the resistor R6, the resistor R7, and the resistor R8 are all 22 Ω resistors.

As an embodiment of the present invention, further, the capacitor C1 and the capacitor C5 are both 100nF capacitors, and the capacitor C2, the capacitor C3, the capacitor C4, the capacitor C6, the capacitor C7, and the capacitor C8 are all 33pF capacitors.

Specifically, this a two-way SIM card communication switching circuit's for battery charging outfit theory of operation: the single chip microcomputer a1 sends a communication circuit switching signal to the switching chip U1b1, the switching chip U1b1 sends a communication control signal to the chip SIM1d11 or the chip SIM2d12, when the chip SIM1d11 works, the switching chip U1b1 inputs the communication control signal to the chip SIM1d11, the uncertain signals in the channel 1 are clamped at a high level through the resistor R1, the resistor R2, the resistor R3 and the resistor R4, and the input current is limited, meanwhile, the channel 1 signals are filtered through the capacitor C1, the capacitor C2, the capacitor C3 and the capacitor C4, the uncertain signals can be prevented from generating interference, meanwhile, the ESD electrostatic protection chip U2 provides electrostatic protection for the channel 1, and the damage of components in the channel 1 caused by the high current is avoided; when the chip SIM2d12 works, the switching chip U1b1 inputs communication control signals to the chip SIM2d12, the resistor R5, the resistor R6, the resistor R7 and the resistor R8 clamp uncertain signals in the channel 2 at a high level, and play a role in limiting the input current, and meanwhile, the channel 2 signals are filtered through the capacitor C5, the capacitor C6, the capacitor C7 and the capacitor C8, so that the uncertain signals can be prevented from generating interference, meanwhile, the ESD electrostatic protection chip U3 provides electrostatic protection for the channel 2, and the damage of components in the channel 2 caused by high current is avoided.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A two-way SIM card communication switching circuit for charging equipment is characterized by comprising a single chip microcomputer (a1), a switching chip U1(b1), a current-limiting pull-up resistor (c1) and a SIM card seat (d 1);

the GPIO of the singlechip (a1) is electrically connected with a second pin of the switching chip U1(b1) through a capacitor C9, and the other end of the capacitor C9 is electrically connected with a GND wire grounding end and is used for inputting a communication circuit switching signal to the switching chip U1(b 1);

the number of the SIM card holders (d1) is two, chip SIMs 1(d11) and chip SIMs 2(d12) are respectively installed inside the two SIM card holders (d1), and the chip SIMs 1(d11) and the chip SIMs 2(d12) are electrically connected with the switching chip U1(b1) through the current-limiting pull-up resistor (c1) and are used for receiving communication control signals output by the switching chip U1(b 1).

2. A two-way SIM card communication switching circuit for a charging device according to claim 1, characterized in that the current limiting pull-up resistor (c1) comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7 and a resistor R8.

3. The two-way SIM card communication switching circuit for the charging equipment of claim 2, characterized in that the first pin of the switching chip U1(b1) is electrically connected with a capacitor C1, the first pin and the second pin of the chip SIM1(d11) are respectively and electrically connected with two ends of the capacitor C1, and the other end of the capacitor C1 is electrically connected with GND wire ground, the thirteenth pin, the ninth pin and the fifth pin of the switching chip U1(b1) are respectively and electrically connected with one end of the resistor R2, the resistor R3 and the resistor R4, and the other end of the switch chip U1(b 11) is respectively and electrically connected with the sixth pin, the fifth pin and the third pin of the chip SIM1(d 11).

4. The two-way SIM card communication switching circuit for the charging device of claim 3, further comprising an ESD protection chip U2, wherein a first pin of the ESD protection chip U2 is electrically connected to one end of the capacitor C1, a second pin of the ESD protection chip U2 is electrically connected to a GND wire ground, a third pin of the ESD protection chip U2 is electrically connected to the first pin of the switching chip U1(b1), the resistor R1, the resistor R2 and one end of the capacitor C2, and the other end of the capacitor C2 is electrically connected to a GND wire ground to form a loop, the resistor R3 and the resistor R4 are electrically connected to a capacitor C3 and a capacitor C4, the capacitor C3 and the capacitor C4 are both electrically connected to a GND wire ground, a fourth pin and a fifth pin of the ESD protection chip U2 are electrically connected to a third pin and a sixth pin of the chip 1(d11), respectively, and the ninth pin and the tenth pin of the chip SIM1(d11) are electrically connected with an EARTH lightning protection ground terminal.

5. The two-way SIM card communication switching circuit for the charging equipment of claim 2, wherein the fifteenth pin of the switching chip U1(b1) is electrically connected with the capacitor C5, the first pin and the second pin of the chip SIM1(d11) are respectively and electrically connected with two ends of the capacitor C5, and the other end of the capacitor C5 is electrically connected with the GND wire ground, the eleventh pin, the seventh pin and the third pin of the switching chip U1(b1) are respectively and electrically connected with one end of the resistor R6, the resistor R7 and the resistor R8, and the other end of the same is respectively and electrically connected with the sixth pin, the fifth pin and the third pin of the chip SIM1(d 11).

6. The two-way SIM card communication switching circuit for the charging device of claim 5, further comprising an ESD protection chip U3, wherein a first pin of the ESD protection chip U3 is electrically connected to one end of the capacitor C5, a second pin of the ESD protection chip U3 is electrically connected to a GND wire ground, a third pin of the ESD protection chip U3 is electrically connected to a fifteenth pin of the switching chip U1(b1), the resistor R5, the resistor R6 and one end of a capacitor C6, and the other end of the capacitor C6 is electrically connected to a GND wire ground to form a loop, the resistor R7 and the resistor R8 are electrically connected to a capacitor C7 and a capacitor C8, the capacitor C7 and the capacitor C8 are both electrically connected to a GND wire ground, a fourth pin and a fifth pin of the ESD protection chip U2 are respectively connected to a third pin and a sixth pin of the chip 2(d12), and the ninth pin and the tenth pin of the chip SIM1(d11) are electrically connected with an EARTH lightning protection ground terminal.

7. The two-way SIM card communication switching circuit for charging equipment of claim 4 or 6, wherein the model of the switching chip U1(b1) is FSA2567MPX, and the model of the ESD electrostatic protection chip U2 and the model of the ESD electrostatic protection chip U3 are ESDA6V1W 5.

8. The two-way SIM card communication switching circuit for a charging device according to claim 1, wherein both SIM card holders (d1) are of the model SIMCARD _ C720.

9. The two-way SIM card communication switching circuit for the charging device of claim 2, wherein the resistor R1 and the resistor R5 are both 15K resistors, and the resistor R2, the resistor R3, the resistor R4, the resistor R6, the resistor R7 and the resistor R8 are all 22 Ω resistors.

10. The two-way SIM card communication switching circuit for a charging device of claim 6, wherein said capacitor C1 and said capacitor C5 are both 100nF capacitors, and said capacitor C2, said capacitor C3, said capacitor C4, said capacitor C6, said capacitor C7 and said capacitor C8 are all 33pF capacitors.