USB output discharge circuit and automobile emergency starting power supply

Abstract

The utility model relates to a USB output discharge circuit, comprising a USB output interface comprising a first pin, a second pin and a third pin, a capacitor C31 and a capacitor C32 connected in parallel between the first pin and the ground; the chip U8 comprises an IN pin which is connected to an input voltage VCC, and a capacitor C25 and a capacitor C29 are connected in parallel between the IN pin and the ground; the SW pin is connected to the first pin of the USB output interface through an inductor L3; the COMP pin is grounded through a resistor R18 and a capacitor C34 in sequence; the GND pin is grounded; the chip U6 comprises a VDD pin which is connected to the first pin of the USB output interface through a resistor R16 and is connected to the ground through a capacitor C30; the D-pin is connected to a second pin of the USB output interface; the D + pin is connected to a third pin of the USB output interface; and the GND pin is grounded. According to the USB output discharge circuit disclosed by the utility model, through reasonable circuit design, the structure is simplified, the cost is reduced, and the stability of voltage output and the compatibility of equipment are effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of discharge circuits, in particular to a USB output discharge circuit and an automobile emergency starting power supply. Background Art

[0002] With the development of automotive electronic technology, automotive emergency starting power supplies have gradually become an essential tool for car users. Traditional automotive emergency starting power supplies usually only provide a single high current output to achieve emergency starting of the car. In order to improve the user experience and function expansion of emergency starting power supplies, more and more emergency starting power supplies have begun to integrate USB output functions for charging various portable electronic devices.

[0003] However, the USB output discharge circuit in the prior art has certain shortcomings, for example, some circuit designs are complex and costly, or the voltage output stability and compatibility are poor during use, resulting in poor user experience. In order to overcome these shortcomings, a new circuit design is needed that can simplify the circuit structure while improving stability and compatibility. Utility Model Content

[0004] The purpose of the utility model is to provide a USB output discharge circuit and a car emergency starting power supply to solve the above problems.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] In one aspect, the present application provides a USB output discharge circuit, comprising:

[0007] The USB output interface comprises a first pin, a second pin and a third pin, wherein a capacitor C31 and a capacitor C32 are connected in parallel between the first pin and the ground;

[0008] The chip U8 includes: an IN pin (input voltage pin), connected to the input voltage VCC, and capacitors C25 and C29 are connected in parallel between the IN pin and the ground; a SW pin, connected to the first pin of the USB output interface through an inductor L3; a COMP pin, connected to the ground through a resistor R18 and a capacitor C34 in turn; and a GND pin, connected to the ground;

[0009] Chip U6 includes: a VDD pin, connected to the first pin of the USB output interface through a resistor R16, and connected to the ground through a capacitor C30; a D- pin, connected to the second pin of the USB output interface; a D+ pin, connected to the third pin of the USB output interface; and a GND pin, connected to the ground.

[0010] Preferably, the chip U8 further includes an SS pin, and the SS pin is grounded via a capacitor C33.

[0011] Preferably, the chip U8 further includes a BS pin, and the BS pin is connected to the SW pin via a capacitor C23.

[0012] Preferably, the chip U8 further includes a FB pin, which is connected to the first pin of the USB output interface through a resistor R17 and is connected to the ground through a resistor R19; the chip U6 further includes a FBO pin, which is connected to the FB pin of the chip U8.

[0013] Preferably, chip U8 also includes an EN pin, which is connected to the main control chip through resistor R15; the USB output interface also includes a fourth pin, which is grounded through resistor R20 and connected to the main control chip through resistor R21, and the fourth pin is grounded through resistor R21 and capacitor C35 in turn.

[0014] Preferably, the chip U6 further includes a QC_EN pin, and the QC_EN pin is connected to the VDD pin of the chip U6.

[0015] Preferably, the model of the chip U8 is LSP5523.

[0016] Preferably, the model of the chip U6 is IP2161.

[0017] On the other hand, the present application provides an automobile emergency starting power supply, comprising the above-mentioned USB output discharge circuit.

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] The SW pin of chip U8 is connected to the first pin of the USB output interface through inductor L3, and the energy storage characteristics of inductor L3 are used to achieve efficient energy conversion and transmission; the capacitors C25 and C29 connected in parallel between the IN pin of chip U8 and the ground help to filter out high-frequency noise and stabilize the input voltage VCC. The capacitors C31 and C32 connected in parallel between the first pin of the USB output interface and the ground can effectively filter out voltage fluctuations and provide stable voltage output. The COMP pin is grounded through resistor R18 and capacitor C34, which stabilizes the feedback loop and further ensures the stability of the output voltage; the D- pin and D+ pin of chip U6 are respectively connected to the second pin and the third pin of the USB output interface, which can communicate with various USB devices, automatically adjust the output voltage, and be compatible with multiple charging protocols. In summary, the USB output discharge circuit not only simplifies the structure and reduces the cost through reasonable circuit design, but also effectively improves the stability of voltage output and device compatibility, thereby providing users with a better user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0021] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with this technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantive technical significance. Any structural modification, change in proportion or adjustment of size, without affecting the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical contents disclosed by the present invention.

[0022] Figure 1 FIG. 4 is a schematic diagram of the structure of the USB output discharge circuit in this embodiment. DETAILED DESCRIPTION

[0023] In order to make the utility model's purpose, features, and advantages more obvious and easy to understand, the following will be combined with the drawings in the utility model embodiments to clearly and completely describe the technical solutions in the utility model embodiments. Obviously, the embodiments described below are only part of the utility model embodiments, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] In the description of the present invention, it should be understood that the terms "upper", "lower", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. It should be noted that when a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a centrally arranged component at the same time.

[0025] The technical solution of the utility model is further explained below with reference to the accompanying drawings and through specific implementation methods.

[0026] Reference Figure 1 , the USB output discharge circuit disclosed in this embodiment includes:

[0027] The USB output interface comprises a first pin, a second pin and a third pin, wherein a capacitor C31 and a capacitor C32 are connected in parallel between the first pin and the ground;

[0028] The chip U8 includes: an IN pin (input voltage pin), connected to an input voltage VCC, and capacitors C25 and C29 are connected in parallel between the IN pin and the ground; a SW pin (switch pin), connected to the first pin of the USB output interface through an inductor L3; a COMP pin (compensation pin), connected to the ground through a resistor R18 and a capacitor C34 in turn; and a GND pin (ground pin), connected to the ground;

[0029] Chip U6 includes: a VDD pin (power pin), connected to the first pin of the USB output interface through a resistor R16, and connected to the ground through a capacitor C30; a D- pin (data negative pin), connected to the second pin of the USB output interface; a D+ pin (data positive pin), connected to the third pin of the USB output interface; and a GND pin (ground pin), grounded.

[0030] The SW pin of chip U8 is connected to the first pin of the USB output interface through inductor L3, and the energy storage characteristics of inductor L3 are used to achieve efficient energy conversion and transmission; the capacitors C25 and C29 connected in parallel between the IN pin of chip U8 and the ground help to filter out high-frequency noise and stabilize the input voltage VCC. The capacitors C31 and C32 connected in parallel between the first pin of the USB output interface and the ground can effectively filter out voltage fluctuations and provide stable voltage output. The COMP pin is grounded through resistor R18 and capacitor C34, which stabilizes the feedback loop and further ensures the stability of the output voltage; the D- pin and D+ pin of chip U6 are respectively connected to the second pin and the third pin of the USB output interface, which can communicate with various USB devices, automatically adjust the output voltage, and be compatible with multiple charging protocols. In summary, the USB output discharge circuit not only simplifies the structure and reduces the cost through reasonable circuit design, but also effectively improves the stability of voltage output and device compatibility, thereby providing users with a better user experience.

[0031] Among them, the chip U8 also includes an SS pin (soft start pin), which is grounded through a capacitor C33. A soft start function is provided to prevent surge current during startup and protect the safety of the circuit and load equipment.

[0032] Among them, the chip U8 also includes a BS pin (bootstrap pin), and the BS pin is connected to the SW pin through a capacitor C23, which improves the efficiency of the switch conversion and reduces energy loss.

[0033] Among them, chip U8 also includes a FB pin (feedback pin), which is connected to the first pin of the USB output interface through a resistor R17 and is connected to the ground through a resistor R19, forming a feedback loop. This feedback loop can effectively monitor and adjust the output voltage to ensure that the USB output interface provides a stable voltage, thereby protecting the connected device; chip U6 also includes a FBO pin (feedback output pin), which is connected to the FB pin of chip U8. Through a reasonable feedback voltage adjustment mechanism, the output voltage can be accurately controlled to ensure that the output voltage meets the requirements of the USB device.

[0034] Among them, chip U8 also includes an EN pin (enable pin), which is connected to the main control chip through a resistor R15. The main control chip is used to control the start and stop of chip U8 to ensure that the circuit works only when needed to save energy; the USB output interface also includes a fourth pin, which is grounded through a resistor R20 and connected to the main control chip through a resistor R21, and the fourth pin is grounded through a resistor R21 and a capacitor C35 in turn. This design allows the main control chip to control the startup of the U8 chip to provide protection against overcurrent and overvoltage, and enhance the safety and reliability of the circuit.

[0035] Among them, chip U6 also includes a QC_EN pin (fast charge enable pin), which is connected to the VDD pin of chip U6. This enables the circuit to support the fast charge protocol and meet the needs of modern electronic devices for fast charging.

[0036] The model of the chip U8 is LSP5523. LSP5523 has good voltage regulation capability, can stabilize the output voltage, and reduce the impact of voltage fluctuations on the device. This feature improves the stability of USB output and ensures the reliability of charging various portable electronic devices.

[0037] The model of the chip U6 is IP2161. IP2161 integrates multiple functional modules required by USB ports, including voltage regulation, data line control, etc. The high integration makes the circuit design more concise, reduces the demand for external components, and thus reduces the circuit complexity and production cost.

[0038] This embodiment also discloses a car emergency starting power supply, including the above-mentioned USB output discharge circuit. By integrating the USB output discharge circuit, the car emergency starting power supply can not only start the car, but also provide power for various portable electronic devices, thereby improving the versatility and practicality of the product.

[0039] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A USB output discharge circuit, characterized in that: include: The USB output interface comprises a first pin, a second pin and a third pin, wherein a capacitor C31 and a capacitor C32 are connected in parallel between the first pin and the ground; The chip U8 includes: an IN pin connected to an input voltage VCC, with capacitors C25 and C29 connected in parallel between the IN pin and the ground; a SW pin connected to the first pin of the USB output interface through an inductor L3; a COMP pin connected to the ground through a resistor R18 and a capacitor C34 in turn; and a GND pin connected to the ground; Chip U6 includes: a VDD pin, connected to the first pin of the USB output interface through a resistor R16, and connected to the ground through a capacitor C30; a D- pin, connected to the second pin of the USB output interface; a D+ pin, connected to the third pin of the USB output interface; and a GND pin, connected to the ground.

2. The USB output discharge circuit according to claim 1, characterized in that: The chip U8 also includes a SS pin, which is grounded through a capacitor C33.

3. The USB output discharge circuit according to claim 1, characterized in that: Chip U8 also includes a BS pin, which is connected to the SW pin through a capacitor C23.

4. The USB output discharge circuit according to claim 1, characterized in that: The chip U8 further includes an FB pin, which is connected to the first pin of the USB output interface through a resistor R17 and is connected to the ground through a resistor R19; the chip U6 further includes an FBO pin, which is connected to the FB pin of the chip U8.

5. The USB output discharge circuit according to claim 1, characterized in that: Chip U8 also includes an EN pin, which is connected to the main control chip through a resistor R15; the USB output interface also includes a fourth pin, which is grounded through a resistor R20 and connected to the main control chip through a resistor R21, and the fourth pin is grounded through a resistor R21 and a capacitor C35 in turn.

6. The USB output discharge circuit according to claim 1, characterized in that: Chip U6 also includes a QC_EN pin, which is connected to the VDD pin of chip U6.

7. The USB output discharge circuit according to claim 1, characterized in that: The model of the chip U8 is LSP5523.

8. The USB output discharge circuit according to claim 1, characterized in that: The model of the chip U6 is IP2161.

9. An automobile emergency starting power supply, characterized in that: The USB output discharge circuit comprises the USB output discharge circuit as described in any one of claims 1 to 8.

Images