Connector for connecting terminal equipment and external camera

Abstract

The invention discloses a connector for connecting terminal equipment and an external camera. The connector for connecting the terminal equipment and the external camera comprises a first interface, a second interface, a signal amplification module and a boosting module. The first interface is connected with an external camera; the second interface is connected with the terminal equipment; the input end of the signal amplification module is connected with the signal end of the first interface, the output end of the signal amplification module is connected with the signal end of the second interface, and the signal amplification module is used for amplifying video signals output by an external camera; the input end of the boosting module is connected with the power supply end of the second interface, the output end of the boosting module is connected with the power supply end of the first interface, and the boosting module is used for receiving voltage output by the terminal equipment, performing boosting conversion and outputting working voltage meeting the working requirement of the external camera. The connector, connected with the external camera, of the terminal equipment can stably supply power to the external camera while amplifying video signals of the external camera.

Description

Technical Field

[0001] This invention relates to the field of external camera technology, and more particularly to a connector for connecting a terminal device to an external camera. Background Technology

[0002] With the widespread adoption of smart terminal devices, external cameras, as commonly used video acquisition devices, are widely used in various fields. External cameras typically achieve physical connection and signal and power transmission with terminal devices via connectors, and their operating power depends on the output voltage of the terminal device.

[0003] In existing technologies, when the connection distance between an external camera and a terminal device is long, the actual voltage supplied to the external camera may be lower than the rated voltage required for its normal operation, which in turn causes the external camera to be unstable. Summary of the Invention

[0004] This invention provides a connector for connecting a terminal device to an external camera, in order to solve the problem that the power supply voltage to the external camera is insufficient due to the long power supply line between the external camera and the terminal device, which prevents the external camera from working properly.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: In a first aspect, the present invention provides a connector for connecting a terminal device to an external camera, comprising: The first interface is connected to an external camera; The second interface is connected to the terminal device; A signal amplification module, wherein the input end of the signal amplification module is connected to the signal end of the first interface, and the output end of the signal amplification module is connected to the signal end of the second interface, and the signal amplification module is used to amplify the video signal output by the external camera; The boost module has its input terminal connected to the power supply terminal of the second interface and its output terminal connected to the power supply terminal of the first interface. The boost module is used to receive the voltage output by the terminal device and perform boost conversion to output a working voltage that meets the working requirements of the external camera.

[0006] Optionally, both the first interface and the second interface include four pins; The first pin of the first interface is a ground pin, the second and third pins of the first interface are signal pins, the second and third pins of the first interface are connected to the signal output terminal of the external camera, and the fourth pin of the first interface is a power pin, which is connected to the power supply terminal of the external camera. The first pin of the second interface is a ground pin, the second and third pins of the second interface are signal pins, the second and third pins of the second interface are connected to the signal input terminal of the terminal device, and the fourth pin of the second interface is a power pin, which is connected to the power output terminal of the terminal device. The input terminal of the signal amplification module is connected to the second and third pins of the first interface, and the output terminal of the signal amplification module is connected to the second and third pins of the second interface. The input terminal of the boost module is connected to the first and fourth pins of the second interface, and the output terminal of the boost module is connected to the first and fourth pins of the first interface.

[0007] Optionally, the boost module includes a boost chip, a first resistor, and a second resistor; The power input pin of the boost chip is connected to the fourth pin of the second interface, and the power output pin of the boost chip is connected to the fourth pin of the first interface. The first end of the first resistor is connected to the power output pin of the boost chip, and the second end of the first resistor is connected to the voltage feedback pin of the boost chip. The first end of the second resistor is connected to the node between the voltage feedback pin of the boost chip and the second end of the first resistor, and the second end of the second resistor is grounded.

[0008] Optionally, the boost module further includes an energy storage inductor, a sixth capacitor, and a third resistor; The first end of the energy storage inductor is connected to the fourth pin of the second interface, and the second end of the energy storage inductor is connected to the switching node pin of the boost chip. The sixth capacitor is connected between the switching node pin of the boost chip and the bootstrap pin of the boost chip. The first end of the third resistor is connected between the second end of the energy storage inductor and the switching node pin of the boost chip, and the second end of the third resistor is connected to the switching frequency programming pin of the boost chip.

[0009] Optionally, the boost module further includes a first capacitor, a second capacitor, a third capacitor, and a fourth capacitor; The first terminal of the first capacitor is connected to the first terminal of the energy storage inductor, and the second terminal of the first capacitor is grounded. The first terminal of the second capacitor is connected to the first terminal of the energy storage inductor and the power input pin of the boost chip, and the second terminal of the second capacitor is grounded. The first terminal of the third capacitor is connected to the voltage regulator output pin of the boost chip, and the second terminal of the third capacitor is grounded. The first terminal of the fourth capacitor is connected to the power output pin of the boost chip, and the second terminal of the fourth capacitor is grounded.

[0010] Optionally, the boost module further includes a seventh capacitor and a fourth resistor; The first terminal of the seventh capacitor is connected to the soft-start programming pin of the boost chip, and the second terminal of the seventh capacitor is grounded. The first end of the fourth resistor is connected to the adjustable switch peak current limiting pin of the boost chip, and the second end of the fourth resistor is grounded.

[0011] Optionally, the boost module further includes a fifth resistor and a fifth capacitor, which are connected in series between the error amplifier compensation pin of the boost chip and the ground terminal.

[0012] Optionally, the signal amplification module includes an amplification chip, wherein the differential positive line input pin of the amplification chip is connected to the second pin of the first interface, the differential negative line input pin of the amplification chip is connected to the third pin of the first interface, the differential positive line output pin of the amplification chip is connected to the second pin of the second interface, and the differential negative line output pin of the amplification chip is connected to the third pin of the second interface.

[0013] Optionally, the signal amplification module further includes an eighth capacitor, a ninth capacitor, a tenth capacitor, an eleventh capacitor, and a twelfth capacitor; The first terminal of the eighth capacitor is connected to the fourth pin of the second interface, and the second terminal of the eighth capacitor is grounded. The first terminal of the ninth capacitor is connected to the fourth pin of the second interface, and the second terminal of the ninth capacitor is grounded. The first terminal of the tenth capacitor is connected to the fourth pin of the first interface, and the second terminal of the tenth capacitor is grounded. The first terminal of the eleventh capacitor is connected to the fourth pin of the second interface, and the second terminal of the eleventh capacitor is grounded. The first terminal of the twelfth capacitor is connected to the regulated output pin of the amplifier chip, and the second terminal of the twelfth capacitor is grounded.

[0014] Optionally, the signal amplification module further includes a crystal oscillator and pull-down resistors; The first end of the crystal oscillator is connected to the crystal input pin of the amplifier chip, and the second end of the crystal oscillator is connected to the crystal output pin of the amplifier chip. The first end of the pull-down resistor is connected to the reference voltage pin of the amplifier chip, and the second end of the pull-down resistor is grounded.

[0015] This invention, through a first interface connecting to an external camera and a second interface connecting to a terminal device, allows for the in-line connection of a signal amplification module in the video signal transmission path to amplify the original video signal output by the external camera and compensate for video signal transmission attenuation. It also allows for the in-line connection of a boost module in the power supply path to boost the original voltage output by the terminal device and compensate for power supply line losses. This invention solves the problems encountered when an external camera and terminal device are connected over long distances. These problems include blurred or interrupted signals received by the terminal device due to video signal transmission loss, and the actual power supply voltage to the external camera being lower than its rated operating voltage due to power supply line losses, leading to abnormal startup, unstable operation, or even failure to operate normally. This invention achieves clear and stable video signal transmission between the terminal device and the external camera even in long-distance connection scenarios, while providing a stable power supply that meets the operating requirements of the external camera. This effectively expands the deployment range of external cameras and improves the practicality of connecting external cameras to terminal devices.

[0016] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

[0018] Figure 1 This invention provides a connector for connecting a terminal device to an external camera. Figure 2 This is another connector provided in this embodiment of the invention for connecting a terminal device to an external camera; Figure 3 This is another connector provided in the embodiments of the present invention for connecting a terminal device to an external camera. Detailed Implementation

[0019] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0020] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0021] Figure 1 This is a connector provided in an embodiment of the present invention for connecting a terminal device to an external camera. See also... Figure 1 The connector 100 connecting the terminal device to the external camera includes a first interface P1, a second interface P2, a signal amplification module 110, and a boost module 120. The first interface P1 is connected to the external camera 200; the second interface P2 is connected to the terminal device 300; the input terminal of the signal amplification module 110 is connected to the signal terminal of the first interface P1, and the output terminal of the signal amplification module 110 is connected to the signal terminal of the second interface P2. The signal amplification module 110 is used to amplify the video signal output by the external camera 200; the input terminal of the boost module 120 is connected to the power terminal of the second interface P2, and the output terminal of the boost module 120 is connected to the power terminal of the first interface P1. The boost module 120 is used to receive the voltage output by the terminal device 300 and perform boost conversion to output a working voltage that meets the operating requirements of the external camera 200.

[0022] The first interface P1 is the signal output and power receiving interface of the external camera 200. The first interface P1 includes a signal terminal and a power terminal. The signal terminal is used to transmit the video signal output by the external camera 200, and the power terminal is used to receive the stable power supply voltage processed by the boost module 120, providing operating power to the external camera 200. The second interface P2 is the signal receiving and power output interface of the terminal device 300. The second interface P2 also includes a signal terminal and a power terminal. The signal terminal is used to transmit the video signal amplified by the signal amplification module 110 to the terminal device 300 for processing and display, and the power terminal is used to obtain the original power supply voltage from the terminal device 300, providing input power to the boost module 120. For example, the terminal device 300 can be an electronic device such as a mobile phone or computer. For example, the first interface P1 and the second interface P2 can be other types of interfaces such as a Type-C interface; this embodiment of the invention does not limit the types of the first interface P1 and the second interface P2.

[0023] The signal amplification module 110 can be a signal processing and amplification circuit, connected in series in the video signal transmission path between the external camera 200 and the terminal device 300. When the distance between the external camera 200 and the terminal device 300 is long, the video signal will attenuate during transmission due to line loss, such as weaker video signal, blurred image quality, or transmission interruption. The signal amplification module 110 can compensate for the attenuation loss during transmission by amplifying the video signal output by the external camera 200, ensuring that the terminal device 300 can receive a clear and stable video signal.

[0024] The boost module 120 is a power supply voltage compensation device, connected in series in the power supply path between the terminal device 300 and the external camera 200. After long-distance transmission, the original power supply voltage output by the terminal device 300 suffers line loss due to conductor resistance, resulting in a voltage lower than the rated operating voltage reaching the external camera 200. For example, if the external camera 200 requires 5V, only 3.8V may be obtained after line loss. The boost module 120 receives the original power supply voltage from the terminal device 300 and uses its internal boost circuit to raise this voltage to the rated operating voltage required by the external camera 200, compensating for the voltage attenuation caused by line loss. This ensures that the external camera 200 receives a stable power supply even under long-distance connections, preventing problems such as abnormal startup or unstable operation of the external camera 200.

[0025] This invention, through a first interface P1 connected to an external camera 200 and a second interface P2 connected to a terminal device 300, allows for the connection of a signal amplification module 110 in series in the video signal transmission path to amplify the original video signal output by the external camera 200 and compensate for video signal transmission attenuation. It also allows for the connection of a boost module 120 in series in the power supply path to boost the original voltage output by the terminal device 300 and compensate for power supply line losses. This invention solves the problems of blurred or interrupted signals received by the terminal device 300 due to video signal transmission loss when the external camera 200 and the terminal device 300 are connected over long distances, and the problem of the actual power supply voltage of the external camera 200 being lower than its rated operating voltage due to power supply line losses, which in turn causes abnormal startup, unstable operation, or even failure to operate normally. The embodiments of the present invention achieve the technical effect of enabling clear and stable video signal transmission between the terminal device 300 and the external camera 200 even in long-distance connection scenarios, while providing a stable power supply to the external camera 200 to meet its working requirements, effectively expanding the deployment range of the external camera 200 and improving the practicality of the connection between the external camera 200 and the terminal device 300.

[0026] Based on the above embodiments, optionally, both the first interface P1 and the second interface P2 include four pins; the first pin of the first interface P1 is a ground pin, the second and third pins of the first interface P1 are signal pins, the second and third pins of the first interface P1 are connected to the signal output terminal of the external camera 200, and the fourth pin of the first interface P1 is a power pin, connected to the power supply terminal of the external camera 200; the first pin of the second interface P2 is a ground pin, the second and third pins of the second interface P2 are signal pins, and the second interface P2... The second and third pins of the first interface P1 are connected to the signal input terminal of the terminal device 300. The fourth pin of the second interface P2 is a power supply pin and is connected to the power output terminal of the terminal device 300. The input terminal of the signal amplification module 110 is connected to the second and third pins of the first interface P1, and the output terminal of the signal amplification module 110 is connected to the second and third pins of the second interface P2. The input terminal of the boost module 120 is connected to the first and fourth pins of the second interface P2, and the output terminal of the boost module 120 is connected to the first and fourth pins of the first interface P1.

[0027] The first pin of the first interface P1 is grounded to release static electricity and interference signals in the circuit. The second and third pins of the first interface P1 are directly connected to the signal output terminal of the external camera 200, which can transmit the video signal collected by the external camera 200 and does not participate in power supply transmission. The fourth pin of the first interface P1 is directly connected to the power supply terminal of the external camera 200, which only transmits the working voltage after boosting and does not participate in video signal transmission. The first pin of the second interface P2 and the ground pin of the first interface P1 cooperate to form a complete grounding loop for the entire connector, ensuring the stability of the circuit potential. The second and third pins of the second interface P2 are connected to the signal input terminal of the terminal device 300, which transmits the video signal processed by the signal amplification module 110 to the terminal device 300. The fourth pin of the second interface P2 is connected to the power output terminal of the terminal device 300 to obtain the original power supply voltage provided by the terminal device 300. This original power supply voltage can be boosted to the rated working voltage of the external camera 200 by the boost module 120.

[0028] The input terminal of the signal amplification module 110 is connected only to the second and third pins of the first interface P1, and the output terminal is connected only to the second and third pins of the second interface P2, thus achieving physical isolation between the signal path and the power supply path. The input terminal of the boost module 120 is connected to both the first and fourth pins of the second interface P2 to obtain a complete power supply loop; the output terminal of the boost module 120 is connected to both the first and fourth pins of the first interface P1 to output a complete power supply loop. The boost module 120 only processes power supply-related signals and has no connection to signal pins, thus avoiding interference from the boost module 120 that could affect the transmission quality of the video signal.

[0029] The embodiments of the present invention employ a four-pin interface design to clearly define the functions of the signal and power pins. Combined with the physical isolation design between the signal amplification module 110 and the boost module 120, this design can prevent switching interference generated by the boost module 120 from entering the video signal transmission link, thus ensuring clear and stable transmission of video signals in long-distance connection scenarios.

[0030] Figure 2 This is another connector provided in this embodiment of the invention for connecting a terminal device to an external camera. See also... Figure 2Based on the above embodiments, optionally, the boost module 120 includes a boost chip U1, a first resistor R1, and a second resistor R2; the power input pin VIN of the boost chip U1 is connected to the fourth pin S4 of the second interface P2, and the power output pin VOUT of the boost chip U1 is connected to the fourth pin J4 of the first interface P1; the first end of the first resistor R1 is connected to the power output pin VOUT of the boost chip U1, and the second end of the first resistor R1 is connected to the voltage feedback pin FB of the boost chip U1; the first end of the second resistor R2 is connected to the node between the voltage feedback pin FB of the boost chip U1 and the second end of the first resistor R1, and the second end of the second resistor R2 is grounded.

[0031] The power input pin VIN of the boost chip U1 is connected to the fourth pin S4 of the second interface P2, allowing it to obtain the raw power supply voltage output by the terminal device 300. The power output pin VOUT of the boost chip U1 is connected to the fourth pin J4 of the first interface P1, allowing it to supply the stable voltage after boost conversion to the external camera 200 via the first interface P1. The output voltage of the boost chip U1 is equal to (R1 / R2+1)×Vref, where Vref represents the internal reference voltage of the boost chip U1; for example, Vref is 1.2V.

[0032] In this embodiment of the invention, the output voltage of the boost chip U1 is determined by the resistance ratio of the first resistor R1 and the second resistor R2 and the internal reference voltage of the chip. By replacing the first resistor R1 and the second resistor R2 with different resistance values, the output voltage can be flexibly set to adapt to the rated operating voltage of different models of external cameras 200.

[0033] See also Figure 2 Based on the above embodiments, optionally, the boost module 120 further includes an energy storage inductor L1, a sixth capacitor C6, and a third resistor R3; the first end of the energy storage inductor L1 is connected to the fourth pin S4 of the second interface P2, and the second end of the energy storage inductor L1 is connected to the switching node pin SW of the boost chip U1; the sixth capacitor C6 is connected between the switching node pin SW of the boost chip U1 and the bootstrap pin BOOT of the boost chip U1; the first end of the third resistor R3 is connected between the second end of the energy storage inductor L1 and the switching node pin SW of the boost chip U1, and the second end of the third resistor R3 is connected to the switching frequency programming pin FSW of the boost chip U1.

[0034] The energy storage inductor L1 is an energy storage device used by the boost chip U1 to increase the voltage. It works in conjunction with the periodic switching of the internal power switch of the boost chip U1 to achieve voltage superposition. Specifically, when the low-side power switch of the boost chip U1 is turned on, the original supply voltage output by the terminal device 300 forms a closed loop through the S4 pin of the second interface P2, the energy storage inductor L1, and the turned-on low-side power switch. At this time, the energy storage inductor L1 converts electrical energy into magnetic energy for storage, and the current in the loop gradually increases. When the low-side power switch of the boost chip U1 is turned off and the high-side power switch is turned on, the energy storage inductor L1 generates an induced electromotive force (EMF) in the same direction as the input voltage because the current cannot change abruptly. At this time, the magnetic energy stored in the energy storage inductor L1 is converted into electrical energy. This induced EMF is superimposed on the original input voltage and output to the power output pin VOUT through the switching node pin SW, ultimately achieving a boost effect where the output voltage is higher than the input voltage. The sixth capacitor, C6, is a bootstrap capacitor that works in conjunction with the bootstrap pin (BOOT). The function of the bootstrap pin is to supply power to the drive terminal of the high-side power switch. When the low-side power switch is turned on, capacitor C6 charges; when the high-side power switch is turned on, C6 discharges to provide the supply voltage to the high-side power switch. The third resistor, R3, is the switching frequency setting resistor. The value of the third resistor R3 determines the switching operating frequency of the boost chip U1, thus affecting the conversion efficiency of the boost module 120. By selecting an appropriate value for the third resistor R3, the boost module 120 can operate within the optimal frequency range, improving boost efficiency and better meeting the stable power supply requirements of the external camera 200.

[0035] See also Figure 2 Based on the above embodiments, the boost module 120 further includes a first capacitor C1, a second capacitor C2, a third capacitor C3, and a fourth capacitor C4; the first terminal of the first capacitor C1 is connected to the first terminal of the energy storage inductor L1, and the second terminal of the first capacitor C1 is grounded; the first terminal of the second capacitor C2 is connected to the first terminal of the energy storage inductor L1 and the power input pin VIN of the boost chip U1, and the second terminal of the second capacitor C2 is grounded; the first terminal of the third capacitor C3 is connected to the regulator output pin VCC of the boost chip U1, and the second terminal of the third capacitor C3 is grounded; the first terminal of the fourth capacitor C4 is connected to the power output pin VOUT of the boost chip U1, and the second terminal of the fourth capacitor C4 is grounded.

[0036] In this configuration, the first pin S1 of the second interface P2 is connected to the second terminal of the first capacitor C1 and then grounded. The first pin J1 of the first interface P1 is connected to the second terminal of the fourth capacitor C4 and then grounded. The first capacitor C1 and the second capacitor C2 are filter capacitors on the input side of the boost module 120. The first terminal of the energy storage inductor L1 and the power input pin VIN of the boost chip U1 directly receive the original power supply voltage from the terminal device 300. This voltage itself has ripple, and long-distance transmission lines can also introduce external high-frequency electromagnetic interference. The first capacitor C1 and the second capacitor C2 are connected in parallel to ground, which can filter out input interference, stabilize the input voltage amplitude, and prevent voltage fluctuations and noise from damaging the energy storage of the energy storage inductor L1 and interfering with the working state of the boost chip U1. The third capacitor C3 is a decoupling capacitor for the internal control circuit of the boost chip U1. The regulator output pin VCC is the output terminal of the internal regulator of the boost chip U1, which is dedicated to powering the low-voltage core circuits such as the logic control module, error amplifier, and gate drive circuit of the boost chip U1. The internal circuitry of the boost chip U1 generates high-frequency current fluctuations during operation, which can easily create noise on the regulator's output pin, VCC. The third capacitor, C3, filters out this noise, providing a clean and stable power supply for the control circuitry of the boost chip U1. The fourth capacitor, C4, is a filter capacitor on the output side of the boost module 120. It filters out high-frequency interference carried by the output voltage, resulting in a smooth and clean output voltage, providing a stable power supply for the external camera 200.

[0037] This invention achieves complete power noise suppression at three key power nodes—power input, power supply to the boost chip U1, and power output—through the use of a first capacitor C1, a second capacitor C2, a third capacitor C3, and a fourth capacitor C4. Specifically, the first capacitor C1 and the second capacitor C2 block interference from external transmission lines and the terminal device 300 from entering the boost module 120; the third capacitor C3 eliminates internal noise generated by the boost chip U1, improving the power stability of the boost module 120; and the fourth capacitor C4 ensures stable output voltage, preventing power noise from causing malfunctions in the external camera 200, further enhancing the overall reliability of the connector in long-distance connection scenarios.

[0038] See also Figure 2 Based on the above embodiments, the boost module 120 further includes a seventh capacitor C7 and a fourth resistor R4; the first end of the seventh capacitor C7 is connected to the soft-start programming pin SS of the boost chip U1, and the second end of the seventh capacitor C7 is grounded; the first end of the fourth resistor R4 is connected to the adjustable switch peak current limiting pin ILIM of the boost chip U1, and the second end of the fourth resistor R4 is grounded.

[0039] The seventh capacitor, C7, is a soft-start capacitor used to set the rise rate of the SS voltage at the soft-start pin of the boost chip U1 during the soft-start process. This controls the proportion of the conduction time of the power switch transistors inside the boost chip U1, preventing the large surge current generated at the moment of power-up from causing instantaneous damage to its power devices. The fourth resistor, R4, is used to set the upper limit of the peak switching current of the boost chip U1. The boost chip U1 identifies the resistance value of the fourth resistor R4 by detecting the level of the peak switching current limit pin ILIM. The larger the resistance value of the fourth resistor R4, the higher the detection level of the peak switching current limit pin ILIM, and the lower the peak switching current limit threshold set by the boost chip U1. Conversely, the smaller the resistance value of the fourth resistor R4, the lower the detection level of the peak switching current limit pin ILIM, and the higher the peak switching current limit threshold set by the boost chip U1. This threshold limits the peak operating current of the boost circuit inside the boost chip U1. After setting the limit threshold through the fourth resistor R4, the boost chip U1 monitors the boost circuit current in real time. When the operating current of the boost circuit is consistently below the peak current threshold set by the fourth resistor R4, the boost chip U1 performs normal switching operations and inductor energy storage and release to continuously power the external camera 200. When the main boost circuit current exceeds the threshold set by the fourth resistor R4, the boost chip U1 will quickly turn off the internal power switch to prevent the large current from continuously damaging the circuit components.

[0040] See also Figure 2 Based on the above embodiments, the boost module 120 also includes a fifth resistor R5 and a fifth capacitor C5, which are connected in series between the error amplifier compensation pin COMP of the boost chip U1 and the ground terminal.

[0041] The fifth resistor R5 and the fifth capacitor C5 are connected in series to form an RC compensation network, which can prevent the output voltage of the boost chip U1 from oscillating and jittering, providing a smooth, stable, and fluctuation-free power supply voltage for the external camera 200. The boost chip U1 also includes an enable pin EN, a power ground pin PGND, and a signal ground pin AGND. The enable pin EN is used to control whether the boost chip U1 enters normal operation or low-power standby mode. When the enable pin EN is high, the boost chip U1 starts its internal operating circuit and operates normally; when the enable pin EN is low, the boost chip U1 stops boosting and enters standby mode. The power ground pin PGND is connected to the power switch inside the boost chip U1, grounding the current of the power switch. The signal ground pin AGND is a dedicated ground terminal for the internal analog control circuit of the boost chip U1, providing a stable and clean zero-potential reference point for the analog control circuit of the boost chip U1.

[0042] Figure 3This is another connector provided in this embodiment of the invention for connecting a terminal device to an external camera. See also... Figure 3 Based on the above embodiments, optionally, the signal amplification module 110 includes an amplification chip U2. The differential positive line input pin IN_DP of the amplification chip U2 is connected to the second pin J2 of the first interface P1, the differential negative line input pin IN_DM of the amplification chip U2 is connected to the third pin J3 of the first interface P1, the differential positive line output pin OUT_DP3 of the amplification chip U2 is connected to the second pin S2 of the second interface P2, and the differential negative line output pin OUT_DM3 of the amplification chip U2 is connected to the third pin S3 of the second interface P2.

[0043] The differential positive input pin IN_DP and differential negative input pin IN_DM of amplifier chip U2 receive the raw differential video signal output from external camera 200, serving as the entry point for the video signal into signal amplification module 110. The differential positive output pin OUT_DP3 and differential negative output pin OUT_DM3 of amplifier chip U2 transmit the amplified and compensated differential video signal, after passing through signal amplification module 110, to terminal device 300, serving as the exit point for the video signal from signal amplification module 110.

[0044] The differential video signal output by the external camera 200 will experience signal amplitude attenuation due to line loss during long-distance cable transmission. The amplification chip U2 provided in this embodiment of the invention can compensate for the video signal transmission loss by amplifying the differential video signal, ensuring that the video signal strength and clarity reaching the terminal device 300 meet the requirements, and avoiding video blurring, stuttering, or signal interruption.

[0045] See also Figure 2 and Figure 3 Based on the above embodiments, the signal amplification module 110 further includes an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10, an eleventh capacitor C11, and a twelfth capacitor C12; the first end of the eighth capacitor C8 is connected to the fourth pin S4 of the second interface P2, and the second end of the eighth capacitor C8 is grounded; the first end of the ninth capacitor C9 is connected to the fourth pin S4 of the second interface P2, and the second end of the ninth capacitor C9 is grounded; the first end of the tenth capacitor C10 is connected to the fourth pin J4 of the first interface P1, and the second end of the tenth capacitor C10 is grounded; the first end of the eleventh capacitor C11 is connected to the fourth pin S4 of the second interface P2, and the second end of the eleventh capacitor C11 is grounded; the first end of the twelfth capacitor C12 is connected to the regulated output pin VC33 of the amplifier chip U2, and the second end of the twelfth capacitor C12 is grounded.

[0046] VCC1 represents the original power supply voltage output by the terminal device 300. This voltage can be applied to the VCC pin of the amplifier chip U2 to provide operating power for the amplifier chip U2. VCC2 represents the voltage after being boosted and converted by the boost module 120, which is used to provide operating power for the external camera 200. The eighth capacitor C8 and the ninth capacitor C9 are connected in parallel between the original power supply VCC1 output by the terminal device 300 and ground. They can filter out high-frequency or low-frequency noise in VCC1, providing a clean operating power supply for the amplifier chip U2. For example, the eighth capacitor C8 with a capacitance of 10μF and the ninth capacitor C9 with a capacitance of 0.1μF can be used together to suppress low-frequency ripple and high-frequency interference, respectively. The tenth capacitor C10 and the eleventh capacitor C11 are connected in parallel between the boosted external camera 200 power supply VCC2 and ground. They can filter out high-frequency or low-frequency interference generated when the boost module 120 is working, ensuring stable operation of the external camera 200. For example, a tenth capacitor C10 with a capacitance of 10μF and an eleventh capacitor C11 with a capacitance of 0.1μF can be selected. The twelfth capacitor C12 can provide decoupling filtering for the clock circuit inside the amplifier chip U2, eliminating noise in the VC33 power supply and ensuring a stable and reliable clock signal. For example, a twelfth capacitor C12 with a capacitance of 10μF can be selected.

[0047] See also Figure 3 Based on the above embodiments, the signal amplification module 110 further includes a crystal oscillator Y1 and a pull-down resistor R; the first end of the crystal oscillator Y1 is connected to the crystal input pin XIN of the amplifier chip U1, and the second end of the crystal oscillator Y1 is connected to the crystal output pin XOUT of the amplifier chip U2; the first end of the pull-down resistor R is connected to the reference voltage pin REF of the amplifier chip U2, and the second end of the pull-down resistor R is grounded.

[0048] Crystal oscillator Y1 is the external clock source device for amplifier chip U2 and a core peripheral for timing control of amplifier chip U2. Amplifier chip U2 integrates a clock oscillation drive circuit, which provides drive signals to the oscillator input pin XIN and the crystal oscillator output pin XOUT after power-on, exciting crystal oscillator Y1 to generate a fixed-frequency clock signal. This clock signal, after being shaped and divided by the internal circuitry of amplifier chip U2, becomes the unified timing reference for all digital and analog circuits of amplifier chip U2. In the long-distance external camera 200 video signal transmission scenario of this embodiment, signal transmission has extremely high requirements for timing synchronization. Crystal oscillator Y1 provides a stable clock, ensuring that the sampling, amplification, and output operations of amplifier chip U2 for differential video signals are performed according to a unified timing sequence, avoiding problems such as transmission errors in video signals due to clock frequency offset or jitter. For example, crystal oscillator Y1 can be 12MHz. The reference voltage pin REF is the internal reference voltage output and configuration pin of amplifier chip U2. Amplifier chip U2 internally generates a high-precision reference voltage as the reference voltage for the differential signal amplification circuit. The pull-down resistor R sets the DC operating level of the reference voltage pin REF, stabilizing the output potential of the reference voltage. By grounding the reference voltage pin RE through the pull-down resistor R, the potential of the reference voltage pin REF can be clamped near a stable zero-potential reference point, preventing interference levels introduced by floating pins and thus preventing reference voltage drift.

[0049] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0050] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A connector for connecting a terminal device to an external camera, characterized in that, include: The first interface is connected to an external camera; The second interface is connected to the terminal device; A signal amplification module, wherein the input end of the signal amplification module is connected to the signal end of the first interface, and the output end of the signal amplification module is connected to the signal end of the second interface, and the signal amplification module is used to amplify the video signal output by the external camera; The boost module has its input terminal connected to the power supply terminal of the second interface and its output terminal connected to the power supply terminal of the first interface. The boost module is used to receive the voltage output by the terminal device and perform boost conversion to output a working voltage that meets the working requirements of the external camera.

2. The connector for connecting a terminal device and an external camera according to claim 1, characterized in that, Both the first interface and the second interface include four pins; The first pin of the first interface is a ground pin, the second and third pins of the first interface are signal pins, the second and third pins of the first interface are connected to the signal output terminal of the external camera, and the fourth pin of the first interface is a power pin, which is connected to the power supply terminal of the external camera. The first pin of the second interface is a ground pin, the second and third pins of the second interface are signal pins, the second and third pins of the second interface are connected to the signal input terminal of the terminal device, and the fourth pin of the second interface is a power pin, which is connected to the power output terminal of the terminal device. The input terminal of the signal amplification module is connected to the second and third pins of the first interface, and the output terminal of the signal amplification module is connected to the second and third pins of the second interface. The input terminal of the boost module is connected to the first and fourth pins of the second interface, and the output terminal of the boost module is connected to the first and fourth pins of the first interface.

3. The connector for connecting the terminal device and the external camera according to claim 2, characterized in that, The boost module includes a boost chip, a first resistor, and a second resistor; The power input pin of the boost chip is connected to the fourth pin of the second interface, and the power output pin of the boost chip is connected to the fourth pin of the first interface. The first end of the first resistor is connected to the power output pin of the boost chip, and the second end of the first resistor is connected to the voltage feedback pin of the boost chip. The first end of the second resistor is connected to the node between the voltage feedback pin of the boost chip and the second end of the first resistor, and the second end of the second resistor is grounded.

4. The connector for connecting a terminal device and an external camera according to claim 3, characterized in that, The boost module also includes an energy storage inductor, a sixth capacitor, and a third resistor; The first end of the energy storage inductor is connected to the fourth pin of the second interface, and the second end of the energy storage inductor is connected to the switching node pin of the boost chip. The sixth capacitor is connected between the switching node pin of the boost chip and the bootstrap pin of the boost chip. The first end of the third resistor is connected between the second end of the energy storage inductor and the switching node pin of the boost chip, and the second end of the third resistor is connected to the switching frequency programming pin of the boost chip.

5. The connector for connecting a terminal device and an external camera according to claim 4, characterized in that, The boost module also includes a first capacitor, a second capacitor, a third capacitor, and a fourth capacitor; The first terminal of the first capacitor is connected to the first terminal of the energy storage inductor, and the second terminal of the first capacitor is grounded. The first terminal of the second capacitor is connected to the first terminal of the energy storage inductor and the power input pin of the boost chip, and the second terminal of the second capacitor is grounded. The first terminal of the third capacitor is connected to the voltage regulator output pin of the boost chip, and the second terminal of the third capacitor is grounded. The first terminal of the fourth capacitor is connected to the power output pin of the boost chip, and the second terminal of the fourth capacitor is grounded.

6. The connector for connecting a terminal device and an external camera according to claim 5, characterized in that, The boost module also includes a seventh capacitor and a fourth resistor; The first terminal of the seventh capacitor is connected to the soft-start programming pin of the boost chip, and the second terminal of the seventh capacitor is grounded. The first end of the fourth resistor is connected to the adjustable switch peak current limiting pin of the boost chip, and the second end of the fourth resistor is grounded.

7. The connector for connecting a terminal device and an external camera according to claim 6, characterized in that, The boost module also includes a fifth resistor and a fifth capacitor, which are connected in series between the error amplifier compensation pin of the boost chip and the ground terminal.

8. The connector for connecting a terminal device and an external camera according to claim 2, characterized in that, The signal amplification module includes an amplification chip. The differential positive line input pin of the amplification chip is connected to the second pin of the first interface, the differential negative line input pin of the amplification chip is connected to the third pin of the first interface, the differential positive line output pin of the amplification chip is connected to the second pin of the second interface, and the differential negative line output pin of the amplification chip is connected to the third pin of the second interface.

9. The connector for connecting a terminal device and an external camera according to claim 8, characterized in that, The signal amplification module further includes an eighth capacitor, a ninth capacitor, a tenth capacitor, an eleventh capacitor, and a twelfth capacitor; The first terminal of the eighth capacitor is connected to the fourth pin of the second interface, and the second terminal of the eighth capacitor is grounded. The first terminal of the ninth capacitor is connected to the fourth pin of the second interface, and the second terminal of the ninth capacitor is grounded. The first terminal of the tenth capacitor is connected to the fourth pin of the first interface, and the second terminal of the tenth capacitor is grounded. The first terminal of the eleventh capacitor is connected to the fourth pin of the second interface, and the second terminal of the eleventh capacitor is grounded. The first terminal of the twelfth capacitor is connected to the regulated output pin of the amplifier chip, and the second terminal of the twelfth capacitor is grounded.

10. The connector for connecting a terminal device and an external camera according to claim 9, characterized in that, The signal amplification module also includes a crystal oscillator and pull-down resistors; The first end of the crystal oscillator is connected to the crystal input pin of the amplifier chip, and the second end of the crystal oscillator is connected to the crystal output pin of the amplifier chip. The first end of the pull-down resistor is connected to the reference voltage pin of the amplifier chip, and the second end of the pull-down resistor is grounded.

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