Charging chip, circuit board and charger

Abstract

A charging chip, a circuit board and a charger, the charging chip comprises an input voltage detection module, the input voltage detection module comprises a first switch, a first comparator and a voltage divider, the first switch is connected with a ground terminal and a CH-IN pin of the charging chip, the CH-IN pin of the charging chip is used for being connected with a controller, and the first comparator is connected with the controller. The first comparator is connected with the grid electrode of the first switch, the first reference power supply and the voltage divider, when the voltage input into the first comparator by the voltage divider is greater than the voltage of the first reference power supply, the first comparator inputs a high level to the first switch, the first switch is switched on, the CH-IN pin of the charging chip is grounded, and the charging chip is switched on. When the voltage input into the first comparator by the voltage divider is smaller than the voltage of the first reference power supply, the first comparator inputs a low level to the first switch, the first switch is not conducted, and the CH-IN pin of the charging chip is in a floating state, so that the situation that the controller works unstably or is damaged by high voltage when the input voltage is too high is avoided.

Description

Technical Field

[0001] This utility model relates to the field of charging IC technology, specifically to a charging chip, circuit board, and charger. Background Technology

[0002] With the widespread adoption of electronic devices and the continuous development of battery technology, battery charging ICs, as key components in electronic devices, significantly impact the overall performance and user experience of these devices due to their stability and efficiency. In recent years, the market demand for battery charging ICs has been steadily increasing, especially in mobile devices where the requirements for charging speed, safety, and efficiency are becoming increasingly stringent. Due to thunderstorms or magnetic field interference, the charging voltage output from the charger's charging port may fluctuate unstablely, affecting the charger's charging stability and safety. Therefore, it is necessary to incorporate a device within the charger to detect the stability of the charging voltage.

[0003] In existing charging circuits, the charging voltage output from the charging interface is usually divided by resistors and then directly input to the controller MCU. This can lead to unstable operation or damage to the controller when the charging voltage is unstable. Utility Model Content

[0004] The purpose of this invention is to provide a charging chip, circuit board, and charger to solve the problem that in the prior art, the charging voltage output from the charging interface is usually directly input to the controller after being divided by a resistor, which leads to unstable operation or damage to the controller when the charging voltage is unstable.

[0005] To achieve the objectives of this utility model, the following technical solution is provided:

[0006] In a first aspect, this utility model provides a charging chip, including an input voltage detection module. The input voltage detection module includes: a first switch, the source of which is connected to the ground terminal of the charging chip, and the drain of which is connected to the CH-IN pin of the charging chip, the CH-IN pin of the charging chip being used to connect to the CH-IN port of a controller; a first comparator, the output of which is connected to the gate of the first switch, the negative input of which is used to connect to a first reference power supply; and a voltage divider, connecting the VIN pin of the charging chip and the positive input of the first comparator, the VIN pin of the charging chip being used to connect to a charging port. The positive terminal of the input voltage of the port is connected, and the charging interface is used to output the charging voltage. The voltage divider is used to divide the charging voltage to obtain the voltage within the operating range of the first comparator. Specifically, when the voltage input to the first comparator by the voltage divider is greater than the voltage of the first reference power supply, the first comparator inputs a high level to the first switch, the first switch is turned on, and the CH-IN pin of the charging chip is grounded. When the voltage input to the first comparator by the voltage divider is less than the voltage of the first reference power supply, the first comparator inputs a low level to the gate of the first switch, the first switch is not turned on, and the CH-IN pin of the charging chip is in a floating state.

[0007] In one embodiment, the voltage divider includes a first resistor and a second resistor, the first resistor being connected to the positive input terminal of the first comparator and the VIN pin of the charging chip, and the second resistor being connected to the positive input terminal of the first comparator and the ground terminal.

[0008] In one embodiment, the charging chip further includes an input module, an output module, and a control module. The control module is connected to the input module and the output module. The input module is connected to the VIN pin of the charging chip, and the output module is connected to the BAT pin of the charging chip. The BAT pin of the charging chip is used to connect to the positive terminal of the battery. The control module is used to adjust the voltage and current output by the output module to the battery.

[0009] In one embodiment, the charging chip further includes a temperature detection module, which is connected to the control module and is used to detect the operating temperature of the charging chip.

[0010] In one embodiment, the charging chip further includes a status module connected to the control module, the status module being used to indicate the operating status of the charging chip.

[0011] In one embodiment, the charging chip further includes a third resistor, which is connected to the PROR pin of the charging chip and the ground pin of the charging chip. The ground pin of the charging chip is used to connect to the negative terminal of the input voltage of the charging interface.

[0012] Secondly, the present invention also provides a circuit board for a charger, the circuit board including a controller, a charging interface and a charging chip as described in any one of the embodiments of the first aspect, wherein the CH-IN port of the controller is connected to the CH-IN pin of the charging chip, and the charging interface is connected to the VIN pin of the charging chip.

[0013] In one embodiment, the charging chip further includes a status module connected to the controller, the status module being used to indicate the operating status of the charging chip.

[0014] In one embodiment, the circuit board further includes a display module connected to the controller, and the interface of the display module for displaying the charging status includes numbers, characters, patterns, and colors.

[0015] Thirdly, the present invention also provides a charger, comprising the circuit board described in any one of the embodiments of the second aspect.

[0016] By setting up an input voltage detection module, the CH-IN port of the controller can be kept in a floating or grounded state based on the stability of the charging voltage output from the charging interface, thus preventing the controller from becoming unstable or being damaged by high voltage when the input voltage is too high. Attached Figure Description

[0017] 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 these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of a scaled-down circuit board;

[0019] Figure 2 This is a schematic diagram of a circuit board according to one embodiment;

[0020] Figure 3 This is a schematic diagram of a charging chip according to one embodiment.

[0021] Explanation of reference numerals in the attached figures:

[0022] 1000 - Circuit Board;

[0023] 100-charging chip;

[0024] 10 - Input voltage detection module, M1 - First switch, C1 - First comparator, V1 - First reference power supply, R1 - First resistor, R2 - Second resistor;

[0025] 20 - Input Module;

[0026] 30 - Output module;

[0027] 40 - Control Module;

[0028] 50 - Temperature detection module;

[0029] 60 - Status Module;

[0030] MCU - Controller;

[0031] R3 - Third resistor;

[0032] 200 - Charging interface, VCC - Positive input voltage of the charging interface;

[0033] GND - The negative input voltage terminal of the charging interface, the ground pin of the charging chip, and the ground terminal of the charging chip;

[0034] 300 - Display Module;

[0035] 2000-battery. Detailed Implementation

[0036] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] It should be noted that when a component is said to be "fixed" to another component, it can be directly on the other component or it can be in a middle component. When a component is said to be "connected" to another component, it can be directly connected to the other component or it may be in a middle component.

[0038] Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terms and characters used in this specification are for the purpose of describing particular embodiments only and are not intended to be limiting of the invention. The term "and / or" as used in this invention includes any and all combinations of one or more of the associated listed items.

[0039] The following detailed description, in conjunction with the accompanying drawings, outlines some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0040] Please refer to Figure 2 and Figure 3 This utility model provides a charging chip 100, including an input voltage detection module 10. The input voltage detection module 10 includes a first switch M1, a first comparator C1, and a voltage divider. The source of the first switch M1 is connected to the ground terminal GND of the charging chip, and the drain of the first switch M1 is connected to the CH-IN pin of the charging chip 100. The CH-IN pin of the charging chip 100 is used to connect to the CH-IN port of the controller MCU. The output terminal of the first comparator C1 is connected to the gate of the first switch M1, and the negative input terminal of the first comparator C1 is used to connect to a first reference power supply V1. The voltage divider is connected to the VIN pin of the charging chip 100 and the positive input terminal of the first comparator C1. The VIN pin of the charging chip 100 is connected to the positive input terminal of the first comparator C1. The N pin is used to connect to the positive input voltage VCC of the charging interface. The charging interface 200 is used to output the charging voltage. The voltage divider is used to divide the charging voltage to obtain the voltage within the operating range of the first comparator C1. When the voltage input to the first comparator C1 by the voltage divider is greater than the voltage of the first reference power supply V1, the first comparator C1 inputs a high level to the first switch M1, the first switch M1 is turned on, and the CH-IN pin of the charging chip 100 is grounded. When the voltage input to the first comparator C1 by the voltage divider is less than the voltage of the first reference power supply V1, the first comparator C1 inputs a low level to the gate of the first switch M1, the first switch M1 is not turned on, and the CH-IN pin of the charging chip 100 is in a floating state.

[0041] The first switch M1 is an N-type MOSFET (N-Metal-Oxide-Semiconductor). When the first comparator C1 inputs a first high level to the first switch M1, the first switch M1 is turned on. When the first comparator C1 inputs a first low level to the first switch M1, the first switch M1 is turned off.

[0042] The charging voltage passes through the VIN pin of the charging chip 100 and the voltage divider before being input to the positive input of the first comparator C1. When the charging voltage is normal, the value of the charging voltage is 5V. When the charging voltage is abnormal, the value of the charging voltage is greater than or less than 5V.

[0043] Specifically, when the voltage input to the first comparator C1 of the voltage divider is greater than the voltage of the first reference power supply V1, the first comparator C1 inputs a high level to the first switch M1, the first switch M1 is turned on, the CH-IN pin of the charging chip 100 is grounded, so that the CH-IN port of the controller MCU is grounded, so that when the charging voltage is too high, the CH-IN port of the controller MCU is in a grounded state and will not be damaged by high voltage.

[0044] When the voltage input to the first comparator C1 of the voltage divider is less than the voltage of the first reference power supply V1, the first comparator C1 inputs a low level to the gate of the first switch M1. The first switch M1 is not turned on, and the CH-IN pin of the charging chip 100 is in a floating state. This makes it impossible for the CH-IN port of the controller MCU to be grounded and thus cannot detect the low level. At this time, the controller MCU detects that the charging voltage is in an abnormal state, that is, the charging voltage is too low.

[0045] Please refer to Figure 1 , Figure 1 The diagram shown is a schematic of a comparative circuit board 1000. In this comparative example, the charging voltage output from the positive input voltage VCC of the charging interface is directly connected to the CH-IN port of the controller MCU through a voltage divider resistor. The controller MCU directly detects the magnitude of the charging voltage. When the charging voltage is too high, the voltage received by the controller MCU will also increase proportionally, which poses a risk of damage to the controller MCU due to high voltage or unstable operation.

[0046] By setting the input voltage detection module 10, the input voltage detection module 10 can keep the CH-IN port of the controller MCU in a floating or grounded state according to the stability of the charging voltage output by the charging interface 200, thus avoiding the instability of the controller MCU or damage by high voltage when the input voltage is too high.

[0047] Furthermore, since the voltage divider is integrated inside the charging chip 100, it saves on external component costs and production costs, while also saving on PCB board size.

[0048] Please refer to Figure 3The voltage divider includes a first resistor R1 and a second resistor R2. The first resistor R1 is connected to the positive input terminal of the first comparator C1 and the VIN pin of the charging chip 100, and the second resistor R2 is connected to the positive input terminal of the first comparator C1 and the ground terminal. The charging voltage is divided by the first resistor R1 before being input to the positive input terminal of the first comparator C1, ensuring that the voltage input to the first comparator C1 is within its operating range.

[0049] By setting a voltage divider including a first resistor R1 and a second resistor R2, the first resistor R1 is connected to the positive input terminal of the first comparator C1 and the VIN pin of the charging chip 100, and the second resistor R2 is connected to the positive input terminal of the first comparator C1 and the ground terminal, so that the voltage input to the first comparator C1 is within the operating range of the first comparator C1, thus preventing damage to the first comparator C1.

[0050] Please refer to Figure 1 and Figure 2 The charging chip 100 also includes an input module 20, an output module 30, and a control module 40. The control module 40 is connected to the input module 20 and the output module 30. The input module 20 is connected to the VIN pin of the charging chip 100, and the output module 30 is connected to the BAT pin of the charging chip 100. The BAT pin of the charging chip 100 is used to connect to the positive terminal of the battery. The control module 40 is used to adjust the voltage and current output by the output module 30 to the battery.

[0051] By setting up an input module 20, an output module 30, and a control module 40, with the control module 40 connected to the input module 20 and the output module 30, the input module 20 connected to the VIN pin of the charging chip 100, and the output module 30 connected to the BAT pin of the charging chip 100, the BAT pin of the charging chip 100 is used to connect to the positive terminal of the battery, and the control module 40 is used to adjust the voltage and current output by the output module 30 to the battery, so that the charging chip 100 can change the charging process according to the adjustment of the controller MCU and the charging state of the battery 2000, thereby improving charging efficiency and safety.

[0052] Please refer to Figure 3 The charging chip 100 also includes a temperature detection module 50, which is connected to the control module 40 and is used to detect the temperature of the charging chip 100.

[0053] The charging chip 100 also includes a temperature detection module 50, which is connected to the control module 40. The temperature detection module 50 is used to detect the temperature of the charging chip 100, so that the charging chip 100 can adjust the charging current according to the temperature of the charging chip 100, thereby improving the stability and safety of the charging chip 100.

[0054] Please refer to Figure 3 The charging chip 100 also includes a status module 60, which is connected to the control module 40 and is used to indicate the working status of the charging chip 100.

[0055] Specifically, the charging chip 100 also includes a CHAG pin, which is connected to an I / O port of the controller MCU. When the charger is charging the battery 2000, the CHAG pin is pulled low by the status module 60 to indicate that charging is in progress; otherwise, the CHAG pin is in a floating state.

[0056] The charging chip 100 also includes a status module 60, which is connected to the control module 40. The status module 60 is used to indicate the working status of the charging chip 100, so that the charger can display the charging status of the charger, making it convenient for users to check the charging status.

[0057] Please refer to Figure 2 and Figure 3 The charging chip 100 also includes a third resistor R3, which is connected to the PROR pin of the charging chip 100 and the ground pin GND of the charging chip. The ground pin GND of the charging chip is used to connect to the negative input voltage GND of the charging interface.

[0058] The PROR pin is connected to the control module 40. Optionally, the third resistor R3 has an accuracy of 1%, so that when the charging chip 100 is charging in constant current mode, the voltage of the PROR pin of the charging chip 100 is maintained at 1V. Optionally, the resistance value of the third resistor R3 can be set to different values ​​without limitation.

[0059] Optionally, the grounding pin disconnects the third resistor R3 from ground, and an internal 2.5μA current pulls the PROG pin of the control module 40 high. When the voltage on the PROG pin reaches the 2.7V shutdown threshold voltage, the charger enters shutdown mode, charging stops, and the charging current of the charging interface 200 drops to 40μA. Reconnecting the third resistor R3 to ground will restore the charger to normal operation.

[0060] The charging chip 100 also includes a third resistor R3, which is connected to the PROR pin of the charging chip 100 and the ground pin GND of the charging chip. The ground pin GND of the charging chip is used to connect to the negative input voltage GND of the charging interface, so that the circuit board 1000 can adjust the charging current by changing the resistance value of the third resistor R3.

[0061] Please refer to Figure 2 and Figure 3The present invention also provides a circuit board 1000 for a charger. The circuit board 1000 includes a controller MCU, a charging interface 200 and a charging chip 100 in the embodiments of the present invention. The CH-IN port of the controller MCU is connected to the CH-IN pin of the charging chip 100, and the charging interface 200 is connected to the VIN pin of the charging chip 100.

[0062] Specifically, the positive input voltage VCC of the charging interface is connected to the VIN pin of the charging chip 100, and the negative input voltage GND of the charging interface is connected to the ground terminal GND of the charging chip.

[0063] The circuit board 1000 provided by this utility model, by employing a controller MCU, a charging interface 200 and a charging chip 100 in the embodiment of this utility model, with the CH-IN port of the controller MCU connected to the CH-IN pin of the charging chip 100, and the charging interface 200 connected to the VIN pin of the charging chip 100, realizes the detection of whether the charging voltage is stable and the protection of the controller MCU when the charging voltage is unstable.

[0064] Please refer to Figure 2 and Figure 3 The charging chip 100 also includes a status module 60, which is connected to the control module 40. The status module 60 is used to indicate the working status of the charging chip 100. The circuit board 1000 also includes a display module 300, which is connected to the controller MCU. The display module 300 is used to display the charging status interface, which includes numbers, characters, patterns and colors.

[0065] The status module 60 is connected to the controller MCU via the CHAG pin so that the controller MCU can receive the working status of the charging chip 100. When the controller MCU receives the working status voltage of the CHAG pin of the charging chip 100, the controller MCU can control the display module 300 to display the corresponding interface.

[0066] By setting up a display module 300, which is connected to the controller MCU, the display module 300 displays the charging status using interface display methods such as numbers, characters, patterns, and colors. This allows the circuit board 1000 to directly display the charging status to the outside world through the display module 300, improving the practicality of the charger.

[0067] In the description of the embodiments of this utility model, it should be noted that the orientation or positional relationship of the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and other indicators are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0068] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Those skilled in the art can understand that implementing all or part of the above-described embodiments and making equivalent changes in accordance with the claims of the present utility model are still within the scope of the present utility model.

Claims

1. A charging chip, characterized in that, The input voltage detection module includes: The first switch has its source connected to the ground terminal of the charging chip and its drain connected to the CH-IN pin of the charging chip. The CH-IN pin of the charging chip is used to connect to the CH-IN port of the controller. A first comparator, the output of which is connected to the gate of the first switch, and the negative input of which is connected to a first reference power supply; A voltage divider is connected to the VIN pin of the charging chip and the positive input terminal of the first comparator. The VIN pin of the charging chip is used to connect to the positive input voltage of the charging interface. The charging interface is used to output the charging voltage. The voltage divider is used to divide the charging voltage to obtain the voltage within the operating range of the first comparator. Specifically, when the voltage input to the first comparator of the voltage divider is greater than the voltage of the first reference power supply, the first comparator inputs a high level to the first switch, the first switch is turned on, and the CH-IN pin of the charging chip is grounded; when the voltage input to the first comparator of the voltage divider is less than the voltage of the first reference power supply, the first comparator inputs a low level to the gate of the first switch, the first switch is not turned on, and the CH-IN pin of the charging chip is in a floating state.

2. The charging chip according to claim 1, characterized in that, The voltage divider includes a first resistor and a second resistor. The first resistor is connected to the positive input terminal of the first comparator and the VIN pin of the charging chip, and the second resistor is connected to the positive input terminal of the first comparator and the ground terminal.

3. The charging chip according to claim 1, characterized in that, The charging chip also includes an input module, an output module, and a control module. The control module is connected to the input module and the output module. The input module is connected to the VIN pin of the charging chip, and the output module is connected to the BAT pin of the charging chip. The BAT pin of the charging chip is used to connect to the positive terminal of the battery. The control module is used to adjust the voltage and current output by the output module to the battery.

4. The charging chip according to claim 3, characterized in that, The charging chip also includes a temperature detection module, which is connected to the control module and is used to detect the operating temperature of the charging chip.

5. The charging chip according to claim 3, characterized in that, The charging chip also includes a status module, which is connected to the control module and is used to indicate the working status of the charging chip.

6. The charging chip according to claim 3, characterized in that, The charging chip also includes a third resistor, which connects the PROR pin of the charging chip and the ground pin of the charging chip. The ground pin of the charging chip is used to connect to the negative terminal of the input voltage of the charging interface.

7. A circuit board, characterized in that, For a charger, the circuit board includes a controller, a charging interface, and a charging chip as described in any one of claims 1-6, wherein the CH-IN port of the controller is connected to the CH-IN pin of the charging chip, and the charging interface is connected to the VIN pin of the charging chip.

8. The circuit board according to claim 7, characterized in that, The charging chip also includes a status module, which is connected to the controller and is used to indicate the working status of the charging chip. The circuit board also includes a display module, which is connected to the controller. The interface of the display module for displaying the charging status includes numbers, characters, patterns, and colors.

9. A charger, characterized in that, Includes the circuit board as described in any one of claims 7 or 8.

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