Type-C socket circuit structure with over-current protection and intelligent identification functions

Abstract

The utility model discloses a Type-C female seat circuit structure with overcurrent protection and intelligent identification functions, comprising a Type-C 6P female seat (1), configuration channel pins CC1 and CC2, a power supply pin VBUS, a grounding pin GND, and data pins D + and D. The CC1 pin is connected to the GND pin through a first pull-down resistor (2), the CC2 pin is connected to the GND pin through a second pull-down resistor (4), and the data pins D + and D. The resistance value of the first pull-down resistor and the resistance value of the second pull-down resistor are both 5.1 kilohms. According to the Type-C 6P socket, the double 5.1 kilohm pull-down resistors and the PTC thermistor are integrated in the Type-C 6P socket, so that the functions of multi-protocol automatic identification and over-current and over-temperature protection are realized, an integrated patch packaging structure is adopted, and the Type-C 6P socket has the advantages of high compatibility, safety and miniaturization integration.

Description

Technical Field

[0001] This utility model relates to the field of Type-C interface technology, specifically to a Type-C female connector circuit structure with overcurrent protection and intelligent identification functions. Background Technology

[0002] Currently, the Type-C interface is widely used in consumer and industrial electronic products such as smartphones, tablets, car chargers, and industrial equipment due to its advantages such as reversible insertion, support for multiple protocols, and high power support. However, existing Type-C female connector circuits still have the following shortcomings in terms of structure and functional design:

[0003] First, traditional Type-C female connector circuits typically connect only a single pull-down resistor (usually 5.1kΩ) to a configuration channel (CC) pin for communication identification with connected devices. This single-resistor solution has compatibility limitations in practical applications, failing to effectively identify and adapt to multiple transmission protocols such as USB 2.0, USB 3.0, and PD (Power Delivery), which may lead to problems such as unstable connections, protocol identification failures, or reduced charging efficiency.

[0004] Secondly, traditional Type-C female connector circuits generally lack overcurrent or overtemperature protection design for the power path. Once abnormal situations such as VBUS port short circuit, misconnection to high voltage or overload occur, it may damage the main control chip, connected devices and power supply, posing a safety hazard.

[0005] Furthermore, existing protection circuits are often implemented using discrete components, meaning that pull-down resistors and overcurrent protection devices (such as PTC thermistors or fuses) are soldered separately onto the motherboard or interface board. This distributed arrangement not only occupies a large amount of PCB board space, which is not conducive to miniaturization design, but also involves cumbersome soldering processes, low reliability, and high assembly costs, making it unsuitable for the requirements of large-scale mass production.

[0006] Therefore, how to achieve multi-protocol compatibility identification, overcurrent and overtemperature protection, and improve integration and reduce size in Type-C female connectors are technical problems that urgently need to be solved in this field. Utility Model Content

[0007] To address the aforementioned issues, this invention provides a Type-C female connector circuit structure with overcurrent protection and intelligent identification functions, which effectively overcomes the shortcomings of existing technologies.

[0008] This utility model is achieved through the following technical solution: a Type-C female connector circuit structure with overcurrent protection and intelligent identification function, including a Type-C 6P female connector, configuration channel pins CC1 and CC2, power supply pin VBUS, ground pin GND, data pins D+ and D-, wherein the CC1 pin is connected to the GND ground pin through a first pull-down resistor, and the CC2 pin is connected to the GND ground pin through a second pull-down resistor, wherein the resistance values ​​of the first pull-down resistor and the second pull-down resistor are both 5.1kΩ;

[0009] A PTC thermistor is connected in series between the VBUS pin and the GND ground pin. The PTC thermistor is in a low resistance state at room temperature and the circuit is normally conducting. When the current is abnormal or the temperature rises to the threshold, the resistance of the PTC thermistor increases to achieve current limiting and circuit breaking protection.

[0010] The first pull-down resistor, the second pull-down resistor, and the PTC thermistor are integrated inside the package structure of the Type-C 6P female connector, forming an integrated circuit module.

[0011] As a preferred technical solution, the first pull-down resistor and the second pull-down resistor can be used in parallel to make the equivalent resistance value 2.55kΩ, so as to achieve automatic recognition and compatibility with USB 3.0 and PD fast charging protocols.

[0012] As a preferred technical solution, the resistance value of the PTC thermistor at 25°C is less than or equal to 50mΩ. When the operating current exceeds 3A or the ambient temperature exceeds 125°C, its resistance value increases significantly, limiting the current to below 0.5A.

[0013] As a preferred technical solution, the first pull-down resistor, the second pull-down resistor, and the PTC thermistor are surface-mount packaged and assembled in one step on a PCB substrate.

[0014] As a preferred technical solution, the first pull-down resistor and the second pull-down resistor are thick film chip resistors with a resistance accuracy of ±1% and a power of 1 / 16W.

[0015] As a preferred technical solution, the PTC thermistor is a ceramic-based positive temperature coefficient element.

[0016] The beneficial effects of this utility model are: This utility model provides a Type-C female connector circuit structure with overcurrent protection and intelligent identification function. By integrating two 5.1kΩ pull-down resistors inside the female connector and connecting them to the CC1 and CC2 pins respectively, it realizes automatic identification and compatibility with multiple protocols such as USB 2.0, USB 3.0, and PD fast charging. No external control chip intervention is required, which simplifies the circuit structure and improves the interface adaptability.

[0017] Furthermore, by connecting a positive temperature coefficient PTC thermistor in series in the VBUS power path, when a short circuit, abnormal current, or excessively high ambient temperature occurs, the PTC resistor rapidly increases its resistance to limit the current, effectively providing dual protection against overcurrent and overtemperature, and ensuring the safe use of the interface circuit and terminal equipment.

[0018] Furthermore, the circuit adopts an integrated packaging structure, pre-mounting the dual pull-down resistors and PTC thermistors inside the socket and completing the process through a one-time surface mount molding process. This not only significantly saves PCB space and meets the design requirements of miniaturized products, but also improves assembly efficiency and electrical connection reliability, and reduces material and assembly costs. 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 these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of this utility model;

[0021] Figure 2 This is a wiring diagram of the present invention;

[0022] Figure 3 This is the circuit schematic diagram of this utility model;

[0023] Figure 4 These are multiple sets of test data graphs for this utility model. Detailed Implementation

[0024] All features disclosed in this specification, or all steps in all disclosed methods or processes, may be combined in any way, except for mutually exclusive features and / or steps.

[0025] Any feature disclosed in this specification (including any appended claims, abstract, and drawings) may be replaced by other equivalent or similar features for a similar purpose, unless specifically stated otherwise. That is, unless specifically stated otherwise, each feature is merely one example of a series of equivalent or similar features.

[0026] like Figures 1-4As shown, this utility model provides a Type-C female connector circuit structure with overcurrent protection and intelligent identification functions, including a Type-C 6P female connector 1, configuration channel pins CC1 and CC2, a power supply pin VBUS, a ground pin GND, and data pins D+ and D-. The CC1 pin is connected to the GND ground pin via a first pull-down resistor 2, and the CC2 pin is connected to the GND ground pin via a second pull-down resistor 4. Both the first and second pull-down resistors have a resistance of 5.1kΩ. These pull-down resistors are used to implement the handshake and identification functions of the configuration channel, ensuring that the external host can detect the connection status and select the appropriate power supply and communication method. This is the basic configuration circuit of the Type-C interface protocol.

[0027] Furthermore, such as Figure 1 As shown, a PTC thermistor 3 is connected in series between the VBUS power supply pin and the GND ground pin. Under normal operating conditions (25℃), the PTC thermistor is in a low-resistance state, the circuit conduction is stable, and the VBUS voltage can be output normally. However, when a short circuit occurs, the current is abnormally high, or the ambient temperature rises to a set threshold (e.g., 125℃), the resistance of the PTC thermistor increases rapidly due to the temperature rise, automatically limiting the current flow, thereby providing combined overcurrent and overtemperature protection to prevent circuit damage.

[0028] Figure 2 The diagram shows the wiring of the Type-C female connector, detailing the function of each pin and their corresponding electrical connections: the ground pins, including A1, A12, and the metal casing SHELL, are all connected to the GND reference ground; the VBUS pins, including A4 and A9, serve as the positive power output channel, with the aforementioned PTC thermistor connected in series with the positive power supply; the CC1 pin is located at A5 and is connected to GND through the first pull-down resistor R1; the CC2 pin is located at B5 and is connected to GND through the second pull-down resistor R2. This pin layout and wiring method ensures the standardization of the circuit structure and the integrity of the electrical functions.

[0029] In terms of structural implementation, to achieve compact integration, the first pull-down resistor, the second pull-down resistor, and the PTC thermistor are all integrated into the Type-C 6P female connector or the PCB area below it, and are assembled in one step using surface mount technology (SMT) to form a complete integrated circuit module. This integrated packaging structure not only effectively saves external wiring space and improves connection reliability, but also meets the integration requirements of small-sized devices for interface modules. Its overall package size does not exceed 8.0mm × 4.5mm × 2.5mm, making it suitable for compact devices such as smart terminals.

[0030] In a preferred embodiment, to further enhance protocol recognition capability, the first pull-down resistor and the second pull-down resistor can be used in parallel to form an identification path with an equivalent resistance of 2.55kΩ, thereby adapting to high-power or high-speed communication scenarios such as USB 3.0 and PD fast charging protocols, improving compatibility and supporting multiple power supply configurations, without the need to introduce an external control chip or MCU for recognition, thus reducing the overall BOM cost.

[0031] The PTC thermistor is preferably a ceramic-based positive temperature coefficient device with a resistance of less than or equal to 50mΩ at 25℃, exhibiting good initial conduction characteristics. When the operating current exceeds 3A or the ambient temperature exceeds 125℃, its resistance rapidly increases, automatically limiting the current to below 0.5A, thus achieving rapid circuit breaking and recovery functions. It is suitable for interface protection of consumer electronic products with fast charging capabilities.

[0032] Furthermore, to ensure processing stability and reliability, the first and second pull-down resistors adopt a thick-film surface-mount resistor structure with a resistance accuracy of ±1% and a rated power of 1 / 16W. The PTC thermistor also adopts a surface-mount structure and can be mounted using a standard reflow soldering process. All three components are integrated on the PCB using surface mounting, which not only meets the requirements for product miniaturization but also ensures consistency and reliability during mass production.

[0033] This invention optimizes the internal circuit structure of the Type-C female connector, organically integrating dual pull-down resistors and a PTC thermistor into one unit. This not only improves the USB protocol recognition capability and security protection level, but also takes into account the product's manufacturability, miniaturization requirements, and production efficiency. It is suitable for power supply and data interface systems in various applications such as smart terminals, vehicle equipment, portable electronic devices, and industrial control modules.

[0034] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions conceived without inventive effort should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope defined in the claims.

Claims

1. A Type-C female connector circuit structure with overcurrent protection and intelligent identification functions, comprising a Type-C 6P female connector (1), a configuration channel CC1 pin, a CC2 pin, a VBUS power supply pin, a GND ground pin, and data pins D+ and D-, characterized in that: The CC1 pin is connected to the GND ground pin through a first pull-down resistor (2), and the CC2 pin is connected to the GND ground pin through a second pull-down resistor (4). The resistance values ​​of the first pull-down resistor and the second pull-down resistor are both 5.1kΩ. A PTC thermistor (3) is connected in series between the VBUS power supply pin and the GND ground pin. The PTC thermistor is in a low resistance state at room temperature and the circuit is normally conducting. When the current is abnormal or the temperature rises to the threshold, the resistance of the PTC thermistor increases to achieve current limiting and circuit breaking protection. The first pull-down resistor (2), the second pull-down resistor (4), and the PTC thermistor are integrated inside the package structure of the Type-C 6P female connector to form an integrated circuit module.

2. The Type-C socket circuit structure with overcurrent protection and intelligent identification function according to claim 1, characterized in that: The first pull-down resistor and the second pull-down resistor can be used in parallel to make the equivalent resistance 2.55kΩ, so as to achieve automatic recognition and compatibility with USB 3.0 and PD fast charging protocols.

3. The Type-C socket circuit structure with overcurrent protection and intelligent identification function according to claim 1, characterized in that: The resistance of the PTC thermistor at 25°C is less than or equal to 50mΩ. When the operating current exceeds 3A or the ambient temperature exceeds 125°C, its resistance increases significantly, limiting the current to below 0.5A.

4. The Type-C socket circuit structure with over-current protection and intelligent identification function according to claim 1, characterized in that: The first pull-down resistor, the second pull-down resistor, and the PTC thermistor are surface-mount packaged and assembled in one step using a PCB substrate.

5. The Type-C socket circuit structure with over-current protection and intelligent identification function according to claim 1, characterized in that: The first and second pull-down resistors are thick-film chip resistors with a resistance accuracy of ±1% and a power rating of 1 / 16W.

6. The Type-C socket circuit structure with over-current protection and intelligent identification function according to claim 1, characterized in that: The PTC thermistor is a ceramic-based positive temperature coefficient element.

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