Wiring detection circuit for protocol USB charger

Abstract

The utility model discloses a wiring detection circuit used for a USB charger with a protocol, comprising a USB charger male head U3, an operational amplifier circuit U1 and a sounding circuit U2, a pin 3IN-interface of the operational amplifier circuit U1 is connected with a pin 3DM interface of the USB charger male head U3, a pin 2IN + interface of the operational amplifier circuit U1 is connected with a pin 2DP interface of the USB charger male head U3, and a pin 3DM interface of the USB charger male head U3 is connected with a pin 2DP interface of the USB charger male head U3. A pin 6VS interface of the operational amplifier circuit U1 and a pin 4VBUS interface of the USB charger male head U3 are connected with a power supply positive electrode V +, a pin 4VOUT of the operational amplifier circuit U1 is connected with an input end of the sounding circuit U2, and an output end of the sounding circuit U2 is grounded GND. The beneficial effects of the utility model are that whether the connection is normal or not is judged through the prompt of the light emitting of the LED and the buzzing of the buzzer in the working process; the detection efficiency is improved and the service life is effectively prolonged.

Description

Technical Field

[0001] This utility model relates to the field of chargers, and more specifically to a wiring detection circuit for a USB charger with protocol. Background Technology

[0002] Mobile phone chargers are essentially composed of a stable power supply (primarily a voltage regulator providing a stable operating voltage and sufficient current) plus necessary constant current, voltage limiting, and time-limiting control circuits. The output parameters marked on original chargers (referring to wired chargers), such as 5.0V / 1A or 5.0V / 1500mA-11200, refer to the parameters of the internal voltage regulator. Chargers for commonly used lithium-ion batteries in mobile phones employ a constant current, voltage-limiting charging system. The charging current is generally around C2, meaning a two-hour charging rate is used. For example, a 500mAh battery might be charged at 250mA for approximately two hours to reach 4.2V before constant voltage charging begins.

[0003] USB electrical products with built-in charging protocols are prone to issues such as unsoldered D+ and D- ports during the manufacturing process, which can prevent the terminal device from charging properly. Utility Model Content

[0004] The purpose of this invention is to provide a wiring detection circuit for a USB charger with protocol, in order to solve at least one technical problem existing in the prior art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A wiring detection circuit for a USB charger with protocol includes a USB charger male connector U3, an operational amplifier circuit U1, and a sound-generating circuit U2. The 3IN- pin of the operational amplifier circuit U1 is connected to the 3DM pin of the USB charger male connector U3. The 2IN+ pin of the operational amplifier circuit U1 is connected to the 2DP pin of the USB charger male connector U3. The 6VS pin of the operational amplifier circuit U1 and the 4VBUS pin of the USB charger male connector U3 are connected to the positive power supply V+. The 4VOUT pin of the operational amplifier circuit U1 is connected to the input terminal of the sound-generating circuit U2. The output terminal of the sound-generating circuit U2 is grounded to GND.

[0007] In a preferred embodiment of the present invention, a resistor R2 is connected between the 4VOUT pin of the operational amplifier circuit U1 and the input terminal of the sound-generating circuit U2.

[0008] In a preferred embodiment of the present invention, a light-emitting circuit is connected between the input and output terminals of the sound-generating circuit U2.

[0009] In a preferred embodiment of the present invention, the light-emitting circuit of the present invention is composed of light-emitting diodes (LEDs).

[0010] In a preferred embodiment of the present invention, the sound-generating circuit of the present invention is composed of an active buzzer.

[0011] In a preferred embodiment of the present invention, a resistor R1 is connected between the 6VS pin of the operational amplifier circuit U1 and the positive power supply V+.

[0012] In a preferred embodiment of the present invention, the operational amplifier circuit U1 is composed of an LM321 low-power operational amplifier.

[0013] Compared with the prior art, the wiring detection circuit for a USB charger with protocol provided by this utility model has the following advantages:

[0014] 1. Compared with traditional circuits, this utility model is simple and intuitive in design. It uses a fixed 2.7V voltage on D+ / D- to pick up the LED and buzzer controlled by the comparator U1. During operation, the connection is judged by the prompts of the LED (lighting up) and the buzzer (sounding).

[0015] 2. By checking whether the D+ and D- terminals of the USB charger U3 are properly connected, the detection efficiency is improved and the service life is effectively extended. Attached Figure Description

[0016] Figure 1 This is a diagram of the circuit components described in this utility model. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0018] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0019] Please see the appendix Figure 1As shown, this embodiment provides a wiring detection circuit for a USB charger with protocol support, including a USB charger male connector U3, an operational amplifier circuit U1, and a sound-generating circuit U2. The 3IN- pin of the operational amplifier circuit U1 is connected to the 3DM pin of the USB charger male connector U3 (the D+ pin of the USB charger male connector U3). The 2IN+ pin of the operational amplifier circuit U1 is connected to the 2DP pin of the USB charger male connector U3 (the D- pin of the USB charger male connector U3). The 6VS pin of the operational amplifier circuit U1 and the 4VBUS pin of the USB charger male connector U3 are connected to the positive power supply V+. The 4VOUT pin of the operational amplifier circuit U1 is connected to the input terminal of the sound-generating circuit U2, and the output terminal of the sound-generating circuit U2 is grounded to GND. The operational amplifier circuit U1 is composed of an LM321 low-power operational amplifier.

[0020] Additionally, a resistor R2 is connected between pin 4VOUT of the operational amplifier circuit U1 and the input terminal of the sound-generating circuit U2. A light-emitting circuit is connected between the input and output terminals of the sound-generating circuit U2. This light-emitting circuit consists of light-emitting diodes (LEDs) 1. The sound-generating circuit consists of an active buzzer. A resistor R1 is connected between pin 6VS of the operational amplifier circuit U1 and the positive power supply terminal V+.

[0021] Working principle of this utility model:

[0022] Working principle:

[0023] The D+ and D- voltages of a typical 5V / 2.4A mobile phone charger are 2.7V. By comparing these two voltages, the system operates when the voltages at pins 1 and 3 of operational amplifier U1 are the same (used as a comparator). Pin 4 of operational amplifier U1 outputs a high level, at which point buzzer U2 sounds and LED1 illuminates, indicating that the voltages at D+ and D- are normal. Conversely, if the voltage at either D+ or D- drops to 0V, pin 4 of operational amplifier U1 remains low, LED1 does not illuminate, and buzzer U2 does not sound, indicating a soldering problem at D+ and D-.

[0024] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A wiring detection circuit for a USB charger with banding protocol, characterized in that, It includes USB charger male head U3, operational amplifier circuit U1 and sound production circuit U2, the pin 3IN- of the operational amplifier circuit U1 is connected with the pin 3DM of the USB charger male head U3, the pin 2IN+ of the operational amplifier circuit U1 is connected with the pin 2DP of the USB charger male head U3, the pin 6VS of the operational amplifier circuit U1 is connected with the pin 4VBUS of the USB charger male head U3, the pin 4VOUT of the operational amplifier circuit U1 is connected with the input end of the sound production circuit U2, the output end of the sound production circuit U2 is connected with the ground GND.

2. A wiring detection circuit for a USB charger with protocol according to claim 1, characterized in that: A resistor R2 is connected between the pin 4VOUT of the operational amplifier circuit U1 and the input end of the sound production circuit U2.

3. The wiring detection circuit for a USB charger with protocol of claim 1, wherein: A light emitting circuit is connected between the input end and the output end of the sound production circuit U2.

4. The wiring detection circuit for a USB charger with protocol of claim 3, wherein: The light emitting circuit is composed of a light emitting diode LED1.

5. The wiring detection circuit for a USB charger with protocol of claim 1, wherein: The sound production circuit is composed of an active buzzer.

6. The wiring detection circuit for a USB charger with protocol of claim 1, wherein: A resistor R1 is connected between the pin 6VS of the operational amplifier circuit U1 and the positive pole V+ of the power supply.

7. The wiring detection circuit for a USB charger with protocol of claim 1, wherein: The operational amplifier circuit U1 is composed of an LM321 low-power operational amplifier.

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