Anti-interference multichannel isolation USB charging voltage short circuit detection module

By using a multi-channel isolated USB charging voltage short-circuit detection module, and utilizing a custom isolation transformer and a sub-microcontroller to achieve four-channel isolated signal communication, the problems of low charger detection efficiency and signal interference are solved, and high-precision and fast short-circuit detection is achieved.

CN223551856UActive Publication Date: 2025-11-14AWELL (GUANGDONG) ELECTRONICS CO LTD
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Patent Information

Application Number
CN202422917295.0
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-11-28
Publication Date
2025-11-14
Estimated Expiration
2034-11-28

AI Technical Summary

Technical Problem

Traditional chargers have low detection efficiency and are susceptible to human error, leading to inaccurate detection. Furthermore, there is signal interference between multiple channels.

Method used

A multi-channel isolated USB charging voltage short-circuit detection module is adopted. It uses a switching power supply and a sub-microcontroller made with a custom isolation transformer to realize four-channel isolated signal communication to prevent interference between channels. The analysis results are transmitted through the serial port, and users can read the test results to disconnect abnormal power supply.

Benefits of technology

It improves detection accuracy, prevents signal interference between channels, ensures that each channel operates independently, and achieves fast and accurate short-circuit detection.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to the technical field of charger production and detection, and discloses an anti-interference multichannel isolation USB charging voltage short circuit detection module, which comprises a main single-chip microcomputer, a plurality of auxiliary single-chip microcomputers, a communication isolation module used for communicating with the auxiliary single-chip microcomputers through multipath isolation signals, a power supply module and a detection module, according to the utility model, four paths of isolation signals are expanded to communicate with the auxiliary single-chip microcomputer, mutual signal interference among channels can be prevented, and the signal channels can be further expanded; the power supply adopts a switching power supply manufactured by a customized isolation transformer, has the characteristics of small size, small ripple, good isolation effect and stable voltage, realizes isolation of one-to-multiple channels, and ensures that the channels do not influence each other; during short circuit detection, an analysis result is transmitted out through a serial port with isolation, a user can read a test result of a certain path by sending a corresponding instruction, and when the test result is abnormal, a product is detected to be abnormal, so that a power supply of the product is cut off.
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Description

Technical Field

[0001] This utility model relates to the field of charger production and testing technology, specifically an anti-interference multi-channel isolated USB charging voltage short-circuit detection module. Background Technology

[0002] A charger is a charging device that uses high-frequency power supply technology and advanced intelligent dynamic adjustment charging technology. The main purpose of charger production testing is to ensure that its safety, reliability, and performance meet standard requirements, thereby guaranteeing user safety and the normal operation of the equipment.

[0003] Due to the numerous processes involved in the production of chargers and the need for welding of components, there is a high product defect rate. Therefore, we need to test them in actual production. Traditional testing uses a multimeter to measure the voltage at both ends, which is slow and prone to human error, leading to inaccurate results.

[0004] Therefore, we need to propose an anti-interference multi-channel isolated USB charging voltage short-circuit detection module, which expands to four isolation signals to prevent mutual interference between channels and improve detection accuracy. Utility Model Content

[0005] The purpose of this invention is to provide an anti-interference multi-channel isolated USB charging voltage short-circuit detection module. It expands communication between four isolated signals and a secondary microcontroller, preventing mutual signal interference between channels, and the signal channels can be further expanded. The power supply uses a custom-made isolation transformer-based switching power supply, characterized by small size, low ripple, good isolation effect, and stable voltage, achieving isolation between multiple channels and ensuring that each channel does not affect the others. During short-circuit detection, the analysis results are transmitted through an isolated serial port. Users can read the test results of a specific channel by sending corresponding commands. When the test results are abnormal, a product malfunction is detected, thereby disconnecting the product's power supply to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an anti-interference multi-channel isolated USB charging voltage short-circuit detection module, comprising a main microcontroller for data acquisition, multiple auxiliary microcontrollers, a communication isolation module for communicating with the auxiliary microcontrollers through multiple isolated signals, a power supply module for powering the short-circuit detection module, and a detection module for detecting USB charging voltage short circuit conditions;

[0007] The communication isolation module and the detection module are both electrically connected to the secondary microcontroller. The communication isolation module is electrically connected to the power supply module, and both the communication isolation module and the power supply module are electrically connected to the primary microcontroller.

[0008] Preferably, the main microcontroller includes a connector J1 and a chip U8. A resistor R22, a crystal oscillator Y1, and capacitors C15 and C16 are connected in parallel between pins 5 and 6 of the chip U8. A capacitor C17 and a capacitor C18 are connected between pins 7 and 9 of the chip U8. A diode D5 and a resistor R24 ​​are connected in parallel on pin 7 of the chip U8.

[0009] Preferably, the sub-microcontroller includes chip U1, and the communication isolation module includes resistor R2 connected between pins 1 and 13 of chip U8, and optocouplers U5, U6, U7, and U8 connected in parallel. Resistor R7 is connected to pin 1 of optocoupler U5. Capacitor C1 and resistor R8 are connected to pins 4 of chip U1 respectively. Resistor R14 is connected to pin 14 of chip U1. One end of resistor R7 is connected to resistor R8 and resistor R14 respectively.

[0010] Preferably, a diode D1 is connected between pin 4 of optocoupler U5 and resistor R2, a diode D2 is connected between pin 4 of optocoupler U6 and resistor R2, a diode D3 is connected between pin 4 of optocoupler U7 and resistor R2, and a diode D4 is connected between pin 4 of optocoupler U8 and resistor R2.

[0011] Preferably, the communication isolation module further includes chip U27, terminal block J7, transistor Q3, optocoupler U26, optocoupler U28, and optocoupler U30. A resistor R98 is connected between pin 6 of chip U27 and pin 1 of terminal block J7, and a resistor R101 is connected between pin 7 of chip U27 and pin 4 of terminal block J7.

[0012] A resistor R93 is connected between chip U27 and the base of transistor Q3. A resistor R90 is connected between the collector of transistor Q3 and pin 2 of optocoupler U26. Resistors R97 and R94 are connected between pin 4 of optocoupler U28 and the base of transistor Q3. Pin 3 of optocoupler U28 is connected to pin 3 of chip U27. A resistor R100 is connected between pin 8 of optocoupler U30 and pin 4 of chip U27. Pin 6 of optocoupler U30 is connected to pin 4 of chip U27.

[0013] Pin 6 of optocoupler U26 is connected to pin 31 of chip U8, pin 2 of optocoupler U28 is connected to pin 29 of chip U8, and pin 3 of optocoupler U30 is connected to pin 30 of chip U8.

[0014] Preferably, the power module includes chip U40, terminal block J11, isolation transformer T2, optocoupler U36, voltage regulator chip U34, and voltage regulator chip U41. Pin 2 of voltage regulator chip U34 is connected to pin 1 of chip U8, and pin 3 of voltage regulator chip U41 is connected to the emitter of transistor Q3.

[0015] A diode D22 is connected between pin 7 of chip U40 and pin 4 of terminal block J11; pin 5 of chip U40 is connected to pins 1 and 3 of terminal block J11; a capacitor C57 is connected between pin 1 of chip U40 and pin 4 of optocoupler U36, and between pin 2 of chip U40 and pin 3 of optocoupler U36.

[0016] A resistor R119 and a MOSFET Q8 are connected between pin 3 of the chip U40 and pin 2 of the isolation transformer T2. A diode D19 is connected between pin 6 of the isolation transformer T2 and pin 1 of the voltage regulator chip U41. A diode D18 is connected between pin 10 of the isolation transformer T2 and pin 3 of the voltage regulator chip U34.

[0017] Preferably, the detection module includes amplifier U21A and amplifier U21B. A resistor R54 is connected between pin 7 of amplifier U21B and pin 3 of amplifier U21A. Resistors R46 and R50 are connected to pin 5 of amplifier U21B. Pins 6 and 7 of amplifier U21B are connected. Pins 1 and 2 of amplifier U21A are connected. A resistor R56 is connected to pin 1 of amplifier U21A. One end of resistor R56 is connected to pin 7 of chip U1.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] 1. This utility model expands the four-channel isolation signal communication with the sub-microcontroller, which can prevent mutual signal interference between the channels, and the signal channels can be further expanded;

[0020] 2. The power supply of this utility model uses a customized isolation transformer to make a switching power supply, which has the characteristics of small size, low ripple, good isolation effect and stable voltage, realizing isolation between multiple channels and ensuring that each channel does not affect each other.

[0021] 3. During short circuit detection, the analysis results are transmitted through an isolated serial port. Users can read the test results of a certain path by sending corresponding commands. When the test results are abnormal, the product malfunction is detected, and the product power supply is disconnected. Attached Figure Description

[0022] Figure 1 This is a system block diagram of the present invention;

[0023] Figure 2 This is the circuit diagram of the main microcontroller of this utility model;

[0024] Figure 3 This is a circuit diagram of the communication isolation module of this utility model;

[0025] Figure 4 This is a circuit diagram of the power supply module of this utility model;

[0026] Figure 5 This is a circuit diagram of the detection module of this utility model;

[0027] Figure 6 This is the circuit diagram of the sub-microcontroller of this utility model. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] Please see Figure 1-6 This utility model provides a technical solution: an anti-interference multi-channel isolated USB charging voltage short circuit detection module, including a main microcontroller for data acquisition, multiple auxiliary microcontrollers, a communication isolation module for communicating with the auxiliary microcontrollers through multiple isolated signals, a power supply module for powering the short circuit detection module, and a detection module for detecting USB charging voltage short circuit conditions;

[0030] The communication isolation module and the detection module are both electrically connected to the secondary microcontroller. The communication isolation module is electrically connected to the power supply module, and both the communication isolation module and the power supply module are electrically connected to the primary microcontroller.

[0031] The main microcontroller includes a connector J1 and a chip U8. A resistor R22, a crystal oscillator Y1, and capacitors C15 and C16 are connected in parallel between pins 5 and 6 of the chip U8. Capacitors C17 and C18 are connected between pins 7 and 9 of the chip U8. A diode D5 and a resistor R24 ​​are connected in parallel to pin 7 of the chip U8.

[0032] Pin 4 of terminal block J1 is connected to pin 1 of chip U8, pin 2 of terminal block J1 is connected to pin 37 of chip U8, and pin 3 of terminal block J1 is connected to pin 34 of chip U8.

[0033] The sub-microcontroller includes chip U1. The communication isolation module includes resistor R2 connected between pins 1 and 13 of chip U8, and optocouplers U5, U6, U7, and U8 connected in parallel. Resistor R7 is connected to pin 1 of optocoupler U5. Capacitor C1 and resistor R8 are connected to pins 4 of chip U1 respectively. Resistor R14 is connected to pin 14 of chip U1. One end of resistor R7 is connected to resistor R8 and resistor R14 respectively.

[0034] The sub-microcontroller also includes a connector J2. Pin 2 of connector J2 is connected to pin 20 of chip U1, and pin 3 of connector J2 is connected to pin 19 of chip U1.

[0035] Pin 2 of optocoupler U5 is connected to pin 17 of chip U1.

[0036] A diode D1 is connected between pin 4 of optocoupler U5 and resistor R2; a diode D2 is connected between pin 4 of optocoupler U6 and resistor R2; a diode D3 is connected between pin 4 of optocoupler U7 and resistor R2; and a diode D4 is connected between pin 4 of optocoupler U8 and resistor R2.

[0037] Resistor R6 is connected to pin 4 of optocoupler U5, resistor R12 is connected to pin 4 of optocoupler U6, resistor R16 is connected to pin 4 of optocoupler U7, and resistor R20 is connected to pin 4 of optocoupler U8. Resistors R6, R12, R16, and R20 are all connected to pin 1 of chip U8.

[0038] The communication isolation module also includes chip U27, terminal block J7, transistor Q3, optocoupler U26, optocoupler U28, and optocoupler U30. A resistor R98 is connected between pin 6 of chip U27 and pin 1 of terminal block J7, and a resistor R101 is connected between pin 7 of chip U27 and pin 4 of terminal block J7.

[0039] A resistor R93 is connected between chip U27 and the base of transistor Q3. A resistor R90 is connected between the collector of transistor Q3 and pin 2 of optocoupler U26. Resistors R97 and R94 are connected between pin 4 of optocoupler U28 and the base of transistor Q3. Pin 3 of optocoupler U28 is connected to pin 3 of chip U27. A resistor R100 is connected between pin 8 of optocoupler U30 and pin 4 of chip U27. Pin 6 of optocoupler U30 is connected to pin 4 of chip U27.

[0040] Pin 6 of optocoupler U26 is connected to pin 31 of chip U8, pin 2 of optocoupler U28 is connected to pin 29 of chip U8, and pin 3 of optocoupler U30 is connected to pin 30 of chip U8.

[0041] A resistor R91 is connected to pin 6 of optocoupler U26, a resistor R96 is connected to pin 1 of optocoupler U28, and a resistor R103 is connected to pin 2 of optocoupler U30. One end of each of the resistors R91, R96, and R103 is connected to pin 1 of chip U8.

[0042] A resistor R92 and an LED1 are connected to pin 1 of chip U27. A resistor R95 is connected between pins 6 and 8 of chip U27. A resistor R107 is connected between pins 5 and 7 of chip U27. One end of LED1 is connected to pin 8 of chip U27.

[0043] The power module includes chip U40, terminal block J11, isolation transformer T2, optocoupler U36, voltage regulator chip U34, and voltage regulator chip U41. Pin 2 of voltage regulator chip U34 is connected to pin 1 of chip U8, and pin 3 of voltage regulator chip U41 is connected to the emitter of transistor Q3.

[0044] A diode D22 is connected between pin 7 of chip U40 and pin 4 of terminal block J11; pin 5 of chip U40 is connected to pins 1 and 3 of terminal block J11; a capacitor C57 is connected between pin 1 of chip U40 and pin 4 of optocoupler U36, and between pin 2 of chip U40 and pin 3 of optocoupler U36.

[0045] A resistor R119 and a MOSFET Q8 are connected between pin 3 of the chip U40 and pin 2 of the isolation transformer T2. A diode D19 is connected between pin 6 of the isolation transformer T2 and pin 1 of the voltage regulator chip U41. A diode D18 is connected between pin 10 of the isolation transformer T2 and pin 3 of the voltage regulator chip U34.

[0046] A resistor R126 is connected between pins 4 and 8 of chip U40, and capacitors C61 and C63 are connected between pins 3 and 4 of chip U40.

[0047] The detection module includes amplifier U21A and amplifier U21B. A resistor R54 is connected between pin 7 of amplifier U21B and pin 3 of amplifier U21A. Resistors R46 and R50 are connected to pin 5 of amplifier U21B. Pins 6 and 7 of amplifier U21B are connected. Pins 1 and 2 of amplifier U21A are connected. A resistor R56 is connected to pin 1 of amplifier U21A. One end of resistor R56 is connected to pin 7 of chip U1.

[0048] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An anti-interference multi-channel isolated USB charging voltage short-circuit detection module, characterized in that: It includes a main microcontroller for data acquisition, multiple slave microcontrollers, a communication isolation module for communicating with the slave microcontrollers through multiple isolated signals, a power supply module for powering the short circuit detection module, and a detection module for detecting short circuits in USB charging voltage. The communication isolation module and the detection module are both electrically connected to the secondary microcontroller. The communication isolation module is electrically connected to the power supply module, and both the communication isolation module and the power supply module are electrically connected to the primary microcontroller.

2. The anti-interference multi-channel isolated USB charging voltage short-circuit detection module according to claim 1, characterized in that: The main microcontroller includes a connector J1 and a chip U8. A resistor R22, a crystal oscillator Y1, and capacitors C15 and C16 are connected in parallel between pins 5 and 6 of the chip U8. Capacitors C17 and C18 are connected between pins 7 and 9 of the chip U8. A diode D5 and a resistor R24 ​​are connected in parallel to pin 7 of the chip U8.

3. The anti-interference multi-channel isolated USB charging voltage short-circuit detection module according to claim 2, characterized in that: The sub-microcontroller includes chip U1. The communication isolation module includes resistor R2 connected between pins 1 and 13 of chip U8, and optocouplers U5, U6, U7, and U8 connected in parallel. Resistor R7 is connected to pin 1 of optocoupler U5. Capacitor C1 and resistor R8 are connected to pins 4 of chip U1 respectively. Resistor R14 is connected to pin 14 of chip U1. One end of resistor R7 is connected to resistor R8 and resistor R14 respectively.

4. The anti-interference multi-channel isolated USB charging voltage short-circuit detection module according to claim 3, characterized in that: A diode D1 is connected between pin 4 of optocoupler U5 and resistor R2; a diode D2 is connected between pin 4 of optocoupler U6 and resistor R2; a diode D3 is connected between pin 4 of optocoupler U7 and resistor R2; and a diode D4 is connected between pin 4 of optocoupler U8 and resistor R2.

5. The anti-interference multi-channel isolated USB charging voltage short-circuit detection module according to claim 4, characterized in that: The communication isolation module also includes chip U27, terminal block J7, transistor Q3, optocoupler U26, optocoupler U28, and optocoupler U30. A resistor R98 is connected between pin 6 of chip U27 and pin 1 of terminal block J7, and a resistor R101 is connected between pin 7 of chip U27 and pin 4 of terminal block J7. A resistor R93 is connected between chip U27 and the base of transistor Q3. A resistor R90 is connected between the collector of transistor Q3 and pin 2 of optocoupler U26. Resistors R97 and R94 are connected between pin 4 of optocoupler U28 and the base of transistor Q3. Pin 3 of optocoupler U28 is connected to pin 3 of chip U27. A resistor R100 is connected between pin 8 of optocoupler U30 and pin 4 of chip U27. Pin 6 of optocoupler U30 is connected to pin 4 of chip U27. Pin 6 of optocoupler U26 is connected to pin 31 of chip U8, pin 2 of optocoupler U28 is connected to pin 29 of chip U8, and pin 3 of optocoupler U30 is connected to pin 30 of chip U8.

6. The anti-interference multi-channel isolated USB charging voltage short-circuit detection module according to claim 5, characterized in that: The power module includes chip U40, terminal block J11, isolation transformer T2, optocoupler U36, voltage regulator chip U34, and voltage regulator chip U41. Pin 2 of voltage regulator chip U34 is connected to pin 1 of chip U8, and pin 3 of voltage regulator chip U41 is connected to the emitter of transistor Q3. A diode D22 is connected between pin 7 of chip U40 and pin 4 of terminal block J11; pin 5 of chip U40 is connected to pins 1 and 3 of terminal block J11; a capacitor C57 is connected between pin 1 of chip U40 and pin 4 of optocoupler U36, and between pin 2 of chip U40 and pin 3 of optocoupler U36. A resistor R119 and a MOSFET Q8 are connected between pin 3 of the chip U40 and pin 2 of the isolation transformer T2. A diode D19 is connected between pin 6 of the isolation transformer T2 and pin 1 of the voltage regulator chip U41. A diode D18 is connected between pin 10 of the isolation transformer T2 and pin 3 of the voltage regulator chip U34.

7. The anti-interference multi-channel isolated USB charging voltage short-circuit detection module according to claim 6, characterized in that: The detection module includes amplifier U21A and amplifier U21B. A resistor R54 is connected between pin 7 of amplifier U21B and pin 3 of amplifier U21A. Resistors R46 and R50 are connected to pin 5 of amplifier U21B. Pins 6 and 7 of amplifier U21B are connected. Pins 1 and 2 of amplifier U21A are connected. A resistor R56 is connected to pin 1 of amplifier U21A. One end of resistor R56 is connected to pin 7 of chip U1.