Protection circuit and battery interface device

Abstract

The utility model discloses a protection circuit and battery interface equipment relates to electronic technical field, wherein, protection circuit connects between battery connector and chip module, and protection circuit includes switch module, the first end of switch module connects the low voltage signal end of battery connector, and the second end of switch module connects the low voltage signal end of chip module, the utility model discloses a switch module is used to make the low voltage signal end of battery connector and chip module be in suspension when switch module is not closed, even in the assembly process of battery connector and chip module, and the contact between high voltage pin and low voltage pin also can not form loop, thereby avoiding the short circuit between high voltage pin and low voltage pin when battery connector and chip connect.

Description

Technical Field

[0001] This utility model relates to the field of electronic technology, and in particular to a protection circuit and battery interface device. Background Technology

[0002] With the increasing demand for higher voltage and smarter batteries, existing products generally use small board-to-board connectors with 8-10 pins, integrating low-voltage communication pins such as I2C (Inter-Integrated Circuit, two-wire serial bus) to enable power information exchange between the battery and the motherboard. However, due to their small size and high assembly precision requirements, these connectors are prone to slippage and misalignment during assembly. This can cause high-voltage battery pins (such as VBAT) to accidentally contact low-voltage signal pins (such as I2C), forming a short circuit and potentially burning out the motherboard's main control chip. Such damage is difficult to detect completely during the assembly stage, and some faults only become apparent after the product has been used. This leads to an increased overall return rate, significantly increasing after-sales costs and maintenance complexity. At the same time, the decreased yield caused by short circuits during production further increases manufacturing costs, affecting product launch time and market competitiveness.

[0003] Therefore, how to avoid short circuits between high-voltage and low-voltage pins when the battery connector is connected to the chip has become an urgent problem to be solved in this field. Utility Model Content

[0004] The main purpose of this invention is to propose a protection circuit and a battery interface device, which aims to solve the technical problem of how to avoid short circuits between high-voltage pins and low-voltage pins when the battery connector is connected to the chip.

[0005] To achieve the above objectives, the present invention proposes a protection circuit, which is connected between the battery connector and the chip module, and includes a switch module and a control module.

[0006] The first end of the switch module is connected to the low-voltage signal terminal of the battery connector, and the second end of the switch module is connected to the low-voltage signal terminal of the chip module.

[0007] The first end of the control module is connected to the control signal terminal of the chip module, and the second end of the control module is connected to the control terminal of the switch module. The control module is used to control the on / off state of the switch module.

[0008] In one embodiment, after the battery connector is connected to the chip module and powered on, the control module responds to the control signal input at the control signal terminal and controls the switch module to remain closed.

[0009] In one embodiment, the switch module includes a multi-way switch, each of which is connected to a low-voltage signal terminal between the battery connector and the chip module.

[0010] In one embodiment, the control module includes an AND gate, the first input of which is connected to the output of the chip module, the second input of which is connected to the power button of the chip module, and the output of which is connected to the control terminal of the switch module.

[0011] In one embodiment, the control module includes an inverting circuit connected between the second input of the AND gate and the power button of the chip module, for inverting the signal output from the power button.

[0012] In one embodiment, after the battery connector is connected to the chip module and powered on, the AND gate receives a high level through its first input terminal and through its second input terminal and the inverting circuit. The AND gate then outputs a high level to the switch module, controlling the switch module to remain closed.

[0013] This utility model also proposes a battery interface device, which includes the protection circuit described above.

[0014] In one embodiment, the battery interface device further includes: a battery connector and a chip module;

[0015] The low-voltage signal terminal of the battery connector is connected to the first terminal of the switching module in the protection circuit;

[0016] The low-voltage signal terminal of the chip module is connected to the second terminal of the switch module, the output terminal of the chip module is connected to the control module of the protection circuit, and the power button terminal of the chip module is connected to the control module.

[0017] In one embodiment, the battery connector is connected to the chip module. When the chip module is powered on, the output terminal of the chip module outputs a high level, the power button terminal of the chip module outputs a low level, the switch module is closed, and the low-voltage signal terminal of the battery connector is connected to the low-voltage signal terminal of the chip module.

[0018] The technical solution of this utility model adopts a switch module, which makes the low-voltage signal terminals of the battery connector and the chip module suspended when the switch module is not closed. Even if misalignment occurs during the assembly of the battery connector and the chip module, and the high-voltage pin and the low-voltage pin come into contact, a circuit will not be formed, thereby avoiding short circuit between the high-voltage pin and the low-voltage pin when the battery connector and the chip are connected. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0020] Figure 1 A schematic diagram of an embodiment of the protection circuit provided by this utility model;

[0021] Figure 2 A schematic diagram of another embodiment of the protection circuit provided by this utility model;

[0022] Figure 3 A schematic diagram of an embodiment of the battery interface device provided by this utility model.

[0023] Explanation of icon numbers:

[0024] 10. Protection circuit; 11. Switching module; 12. Control module; 121. AND gate; 122. Inverting circuit.

[0025] 20. Battery connector;

[0026] 30. Chip module.

[0027] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0029] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0030] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0031] This utility model proposes a protection circuit 10.

[0032] Please see Figure 1 In one embodiment of the present invention, the protection circuit 10 is connected between the battery connector 20 and the chip module 30, and the protection circuit 10 includes a switch module 11.

[0033] The first end of the switch module 11 is connected to the low-voltage signal terminal of the battery connector 20, and the second end of the switch module 11 is connected to the low-voltage signal terminal of the chip module 30.

[0034] It should be noted that, in this embodiment, the battery connector 20 serves as the interface between the external power supply and the internal circuitry of the electronic device. The battery connector 20 typically has multiple pins or terminals for transmitting signals and power at different voltage levels. The chip module 30 is the core processing unit in the electronic device, responsible for performing various calculation, control, and data processing tasks.

[0035] In this embodiment, the protection circuit 10 is located between the battery connector 20 and the chip module 30. Its main function is to control the connection and disconnection of the low-voltage signal terminals of the battery connector 20 and the chip module 30. In particular, the protection circuit 10 includes a switch module 11.

[0036] The switch module 11 has at least two connection terminals, namely a first terminal and a second terminal. The first terminal of the switch module 11 is directly connected to the low-voltage signal terminal of the battery connector 20, and the second terminal is connected to the low-voltage signal terminal of the chip module 30. The switch module 11 can keep the low-voltage signal terminals of the battery connector 20 and the chip module 30 in a floating state before they are properly connected, thus avoiding short circuits caused by incorrect connections.

[0037] Furthermore, in one feasible implementation, please refer to Figure 2 The protection circuit 10 also includes a control module 12;

[0038] The first end of the control module 12 is connected to the control signal terminal of the chip module 30, and the second end of the control module 12 is connected to the control terminal of the switch module 11. The control module 12 is used to control the on / off state of the switch module 11.

[0039] In this embodiment, the control module 12 is responsible for receiving control signals from the chip module 30 and intelligently controlling the on / off state of the switch module 11 according to these signals. This is to ensure that the low-voltage signal terminals of the battery connector 20 and the chip module 30 can remain in a floating state before they are properly connected, thereby effectively avoiding short circuit problems that may be caused by incorrect connection.

[0040] The first end of the control module 12 is connected to the control signal end of the chip module 30 and is used to receive the control signal sent by the chip module 30.

[0041] The second end of the control module 12 is connected to the control end of the switch module 11 and is responsible for controlling the on / off state of the switch module 11. Through this connection, the control module 12 can adjust the switch state according to the needs of the chip module 30 to ensure the safety and stability of signal transmission.

[0042] Furthermore, in one feasible implementation, after the battery connector 20 is connected and powered on to the chip module 30, the control module 12 responds to the control signal input at the control signal terminal and controls the switch module 11 to remain closed.

[0043] In this embodiment, when the battery connector 20 and the chip module 30 are physically connected and powered on through a suitable interface or connector, the low-voltage signal provided by the battery connector 20 is prepared to be transmitted to the chip module 30 through the protection circuit 10. The switch module 11 is designed to change its on / off state according to the instructions issued by the control module 12. After the battery connector 20 and the chip module 30 are connected and powered on, if the control module 12 receives a control signal from the chip module 30 indicating that the switch module 11 should remain closed, the switch module 11 will respond to this signal immediately.

[0044] When the switch module 11 is in the closed state, it allows the low-voltage signal to be smoothly transmitted from the low-voltage signal terminal of the battery connector 20 to the low-voltage signal terminal of the chip module 30, thereby ensuring the normal operation of the system. The control signal is sent from the control signal terminal of the chip module 30 to the first terminal of the control module 12. After the control module 12 parses the signal, it sends the corresponding instruction to the control terminal of the switch module 11 through its second terminal.

[0045] Furthermore, in one feasible implementation, the switch module 11 includes a multi-way switch, each switch being connected to a low-voltage signal terminal between the battery connector 20 and the chip module 30.

[0046] In this embodiment, the switch module 11 consists of multiple independent switches, forming a multi-channel switch system. Each switch is specifically responsible for connecting a specific low-voltage signal terminal between the battery connector 20 and the chip module 30.

[0047] Furthermore, in one feasible implementation, the control module 12 includes an AND gate 121, the first input terminal of the AND gate 121 is connected to the output terminal of the chip module 30, the second input terminal of the AND gate 121 is connected to the power button terminal of the chip module 30, and the output terminal of the AND gate 121 is connected to the control terminal of the switch module 11.

[0048] In this embodiment, the core of the control module 12 is an AND gate 121 logic circuit. The AND gate 121 is a basic digital logic gate circuit that outputs a high-level signal only when all input signals are high. In this structure, the AND gate 121 is used to realize the precise timing and condition judgment of the control of the switch module 11. The first input terminal of the AND gate 121 is connected to the output terminal of the chip module 30.

[0049] The second input of AND gate 121 is connected to the power button of chip module 30. AND gate 121 will only respond to the control signal when chip module 30 is powered normally. The output of AND gate 121 is directly connected to the control terminal of switch module 11. When both inputs of AND gate 121 are high level, the output terminal will output a high level signal, which will trigger the corresponding switch in switch module 11 to close.

[0050] In this way, the control module 12 can ensure that the operation of the switch module 11 is strictly synchronized with the control signal and power state of the chip module 30, thereby improving the stability and reliability of the entire circuit.

[0051] Furthermore, in one feasible implementation, the control module 12 includes an inverting circuit 122, which is connected between the second input terminal of the AND gate 121 and the power button terminal of the chip module 30, for inverting the signal output from the power button terminal.

[0052] In this embodiment, the inverting circuit 122 is used to invert the signal output from the power button.

[0053] Furthermore, in one feasible implementation, after the battery connector 20 is connected and powered on to the chip module 30, the AND gate 121 receives a high level through its first input terminal and through its second input terminal and the inverting circuit 122. The AND gate 121 then outputs a high level to the switch module 11, controlling the switch module 11 to remain closed.

[0054] In this embodiment, after the user connects the battery connector 20 and the chip module 30, pressing the power button pulls the ground terminal of the chip module 30 to a low level, outputting a low level to the inverting circuit 122. After being inverted by the inverting circuit 122, it becomes a high level, and the output terminal of the chip module 30 simultaneously outputs a high level, causing the output terminal of the AND gate 121 to output a high level to the switch module 11, controlling the switch module 11 to remain closed during the operation of the chip module 30.

[0055] The technical solution of this utility model uses a switch module 11 to make the low-voltage signal terminals of the battery connector 20 and the chip module 30 suspended when the switch module 11 is not closed. Even if misalignment occurs during the assembly of the battery connector 20 and the chip module 30, and the high-voltage pin and the low-voltage pin come into contact, a circuit will not be formed, thereby avoiding short circuit between the high-voltage pin and the low-voltage pin when the battery connector 20 is connected to the chip.

[0056] This utility model also proposes a battery interface device, which includes a protection circuit 10. The specific structure of the protection circuit 10 is as described in the above embodiments. Since this battery interface device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0057] Furthermore, in one feasible implementation, the battery interface device further includes: a battery connector 20 and a chip module 30;

[0058] The low-voltage signal terminal of the battery connector 20 is connected to the first terminal of the switch module 11 in the protection circuit 10;

[0059] The low-voltage signal terminal of the chip module 30 is connected to the second terminal of the switch module 11, the output terminal of the chip module 30 is connected to the control module 12 of the protection circuit 10, and the power signal terminal of the chip module 30 is connected to the control module 12.

[0060] In this embodiment, in the battery interface device, the protection circuit 10 is connected between the battery connector 20 and the chip module 30. The switch module 11 in the protection circuit 10 is connected between the low-voltage signals of the battery connector 20 and the chip module 30, so that the low-voltage signals of the battery connector 20 and the chip module 30 are suspended when the switch module 11 is not closed. The control module 12 controls the opening and closing of the switch module 11 based on the signal of the chip module 30.

[0061] Furthermore, in one feasible implementation, the battery connector 20 is connected to the chip module 30. After the chip module 30 is powered on, the output terminal of the chip module 30 outputs a high level, the power signal terminal of the chip module 30 outputs a low level, the switch module 11 is closed, and the low-voltage signal terminal of the battery connector 20 is connected to the low-voltage signal terminal of the chip module 30.

[0062] In this embodiment, after the user connects the battery connector 20 and the chip module 30, pressing the power button pulls the ground terminal of the chip module 30 to a low level, outputting a low level to the inverting circuit 122. After being inverted by the inverting circuit 122, it becomes a high level, and the output terminal of the chip module 30 simultaneously outputs a high level, causing the output terminal of the AND gate 121 to output a high level to the switch module 11, controlling the switch module 11 to remain closed during the operation of the chip module 30.

[0063] For details, please refer to Figure 3 The switch module 11 includes four switches, which are respectively connected to the I2C terminal of the battery connector 20 and the I2C_SDA (serial data line) terminal of the chip module 30, another I2C terminal of the battery connector 20 and the I2C_SCL (serial clock line) terminal of the chip module 30, the ID terminal of the battery connector 20 and the ID terminal of the chip module 30, the THERM terminal of the battery connector 20 and the THERM terminal of the chip module 30, the VBAT terminal of the battery connector 20 and the VBAT terminal of the chip module 30, and the GND terminal of the battery connector 20 and grounded. The switch (COM) is floating when it is at the NC terminal and closed when it is at the ON terminal. The output terminal of the AND gate 121 is connected to the control terminal (S) of the switch. When it is high, it controls all switches to close. The output terminal (GPIO) of the chip module 30 is connected to one input terminal of the AND gate 121, and the power button terminal (POWER) of the chip module 30 is connected to the control terminal (S) of the switch. The KEY is connected to the other input of AND gate 121 via inverter circuit 122. The power button of chip module 30 is grounded via the power button, and the GND terminal of chip module 30 is grounded. The logic of AND gate 121 is as follows: when the power button is closed, the power button is pulled low to a low level, and outputs a high level to AND gate 121 through inverter circuit 122. The output of chip module 30 outputs a high level to AND gate 121, and then AND gate 121 outputs a high level to switch module 11, controlling all switches to close, so that battery connector 20 is connected to the low-voltage signal terminal of chip module 30.

[0064] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A protection circuit, characterized by, The protection circuit is connected between the battery connector and the chip module, and the protection circuit includes a switch module. The first end of the switch module is connected to the low-voltage signal terminal of the battery connector, and the second end of the switch module is connected to the low-voltage signal terminal of the chip module.

2. The protection circuit of claim 1, wherein, The protection circuit also includes a control module; The first end of the control module is connected to the control signal terminal of the chip module, and the second end of the control module is connected to the control terminal of the switch module. The control module is used to control the on / off state of the switch module.

3. The protection circuit of claim 2, wherein, After the battery connector is connected to the chip module and powered on, the control module responds to the control signal input at the control signal terminal and controls the switch module to remain closed.

4. The protection circuit of claim 2, wherein, The switching module includes a multi-way switch, and each of the switches is respectively connected to the low-voltage signal terminals between the battery connector and the chip module.

5. The protection circuit of claim 2, wherein, The control module includes an AND gate, the first input of which is connected to the output of the chip module, the second input of which is connected to the power button of the chip module, and the output of which is connected to the control terminal of the switch module.

6. The protection circuit of claim 5, wherein, The control module includes an inverting circuit connected between the second input terminal of the AND gate and the power button terminal of the chip module, for inverting the signal output from the power button terminal.

7. The protection circuit as described in claim 6, characterized in that, After the battery connector is connected to the chip module and powered on, the AND gate receives a high level through its first input terminal and through its second input terminal and the inverting circuit. The AND gate then outputs a high level to the switch module, controlling the switch module to remain closed.

8. A battery interface device, characterized in that, The battery interface device includes a protection circuit as described in any one of claims 1 to 7.

9. The battery interface device as described in claim 8, characterized in that, The battery interface device further includes: a battery connector and a chip module; The low-voltage signal terminal of the battery connector is connected to the first terminal of the switching module in the protection circuit; The low-voltage signal terminal of the chip module is connected to the second terminal of the switch module, the output terminal of the chip module is connected to the control module of the protection circuit, and the power button terminal of the chip module is connected to the control module.

10. The battery interface device as described in claim 9, characterized in that, The battery connector is connected to the chip module. When the chip module is powered on, the output terminal of the chip module outputs a high level, the power button terminal of the chip module outputs a low level, the switch module is closed, and the low-voltage signal terminal of the battery connector is connected to the low-voltage signal terminal of the chip module.

Images