An alternating current pile output short circuit detection device based on a capacitive coupling pulse signal
By using a short-circuit detection device for AC charging pile output based on capacitively coupled pulse signals, the device isolates high-voltage electricity with safety capacitors and couples low-voltage signals for detection, thus solving the problems of large errors and safety hazards in short-circuit detection of charging pile output and achieving accurate short-circuit detection.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DONGGUAN GUANGBIAO ELECTRONIC TECHNOLOGY CO LTD
- Filing Date
- 2025-08-14
- Publication Date
- 2026-07-21
AI Technical Summary
Existing short-circuit detection for charging piles cannot effectively reduce the impact of high-voltage areas on low-voltage areas, resulting in large errors in detection results, which may lead to charging pile burnout and safety hazards.
An AC charging pile output short-circuit detection device based on capacitively coupled pulse signals is used. High voltage is isolated by first and second safety capacitors, and a low voltage pulse signal is coupled to the high voltage line. The voltage detection circuit detects the voltage signal to determine whether the high voltage line is short-circuited.
It enables accurate detection of high-voltage line short circuits without affecting the low-voltage circuit, reducing errors and preventing damage to charging piles and safety accidents.
Smart Images
Figure CN224536161U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of AC pile output short circuit detection technology, specifically relating to an AC pile output short circuit detection device based on capacitively coupled pulse signal. Background Technology
[0002] With the rapid development of new energy vehicles, the electric vehicle industry has gained popularity and its market share has grown rapidly. However, current charging pile output short circuit detection cannot effectively reduce the influence of high-voltage areas on low-voltage areas, resulting in large errors in detection results. Electric vehicles may continue charging even if the output is short-circuited before charging but this is not detected, leading to the burning of the charging pile. In severe cases, it can cause safety problems such as electric shock and fire. In view of this, this utility model proposes an AC charging pile output short circuit detection device based on capacitively coupled pulse signals. Utility Model Content
[0003] To address the aforementioned shortcomings in the existing technology, this utility model provides an AC pile output short-circuit detection device based on capacitively coupled pulse signals, thereby solving the problems mentioned in the background technology.
[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:
[0005] A short-circuit detection device for AC charging pile output based on capacitively coupled pulse signal includes a main controller. The output terminal of the main controller is connected to the input terminal of a first safety capacitor C. The output terminal of the first safety capacitor C is connected to a live wire. The live wire is connected to the input terminal of a voltage detection circuit. The output terminal of the voltage detection circuit is connected to the input terminal of the main controller. The output terminal of the voltage detection circuit is also connected to the neutral wire output terminal.
[0006] Furthermore, the neutral wire is connected to the input terminal of the second safety capacitor C, and the output terminal of the second safety capacitor C is connected to the first ground wire.
[0007] Furthermore, the voltage detection circuit includes a first control switch connected to the live wire, and the output terminal of the first control switch is connected to the first Y capacitor and the input terminal of the current transformer.
[0008] Furthermore, the output terminal of the first Y capacitor is connected to the microcontroller MCU, and the microcontroller MCU is connected to the first control switch and the ground wire.
[0009] Furthermore, the voltage detection circuit also includes an ADC connection connected to the output terminal of the current transformer, wherein the output terminal of the ADC is connected to the voltage transformer, and the input terminal of the voltage transformer is connected to the output terminal of the current transformer.
[0010] Furthermore, the output terminal of the current transformer is connected to the output terminal of the second control switch and the second Y capacitor, the input terminals of the second control switch and the second Y capacitor are connected to the microcontroller (MCU), and the second control switch is connected in series with the neutral wire.
[0011] 1. This utility model perfectly isolates high voltage through the first safety capacitor C and the second safety capacitor C. When high voltage is energized, it couples a small signal to the low voltage circuit without affecting it. The low voltage pulse signal is coupled to the high voltage line through the safety capacitor. If the live wire and the neutral wire of the high voltage line are not short-circuited, then the neutral wire and the live wire will form a voltage, which is measured to be 30mV. If the neutral wire and the live wire are short-circuited, then the measured voltage is 0V. Attached Figure Description
[0012] Figure 1 This is a schematic diagram of an embodiment of the AC pile output short-circuit detection device based on capacitively coupled pulse signal according to this utility model;
[0013] Figure 2 This is a schematic diagram of the voltage detection circuit structure of an embodiment of an AC pile output short-circuit detection device based on capacitively coupled pulse signals according to this utility model.
[0014] The reference numerals in the accompanying drawings include:
[0015] 1. Main controller, 2. Voltage transformer, 3. Live wire, 4. Neutral wire, 5. First safety capacitor C, 6. Second safety capacitor C, 7. First ground wire, 8. Voltage detection circuit, 9. First control switch, 10. Second ground wire, 11. Second control switch, 12. MCU, 13. First Y capacitor, 14. Second Y capacitor, 15. ADC, 16. Current transformer. Detailed Implementation
[0016] To enable those skilled in the art to better understand this utility model, the technical solution of this utility model will be further described below in conjunction with the accompanying drawings and embodiments.
[0017] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the present invention. To better illustrate the embodiments of the present invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.
[0018] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," "right," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the 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, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this utility model. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.
[0019] In the description of this utility model, unless otherwise explicitly specified and limited, the term "connection" or similar designation indicating the connection relationship between components should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0020] Example 1:
[0021] like Figure 1-2 As shown, an AC charging pile output short-circuit detection device based on capacitively coupled pulse signal includes a main controller 1. The output terminal of the main controller 1 is connected to the input terminal of a first safety capacitor C5. The output terminal of the first safety capacitor C5 is connected to a live wire 3. The live wire 3 is connected to the input terminal of a voltage detection circuit 8. The output terminal of the voltage detection circuit 8 is connected to the input terminal of the main controller 1. The output terminal of the voltage detection circuit 8 is connected to the output terminal of a neutral wire 4.
[0022] Furthermore, the neutral line 4 is connected to the input terminal of the second safety capacitor C6, and the output terminal of the second safety capacitor C6 is connected to the first ground line 7.
[0023] Furthermore, the voltage detection circuit 8 includes a first control switch 9 connected to the live wire, and the output terminal of the first control switch 9 is connected to the first Y capacitor 13 and the input terminal of the current transformer 16.
[0024] Furthermore, the output terminal of the first Y capacitor 13 is connected to the microcontroller MCU 12, and the microcontroller MCU 12 is connected to the first control switch 9 and the ground wire.
[0025] Furthermore, the voltage detection circuit 8 also includes an ADC15 connected to the output terminal of the current transformer 16, the output terminal of the ADC15 being connected to the voltage transformer 2, and the input terminal of the voltage transformer 2 being connected to the output terminal of the current transformer 16.
[0026] Furthermore, the output terminal of the current transformer 16 is connected to the output terminal of the second control switch 11 and the second Y capacitor 14, the input terminals of the second control switch 11 and the second Y capacitor 14 are connected to the microcontroller MCU 12, and the second control switch 11 is connected in series with the neutral line 4.
[0027] like Figure 1 - Figure 2 As shown, the working principle of this device is as follows: the first safety capacitor C5 and the second safety capacitor C6 perfectly isolate the high voltage. When the high voltage is energized, a small signal is coupled through it without affecting the low voltage circuit. Then, the voltage signal is detected by the voltage detection circuit 8. When the low voltage pulse signal is coupled to the high voltage line through the safety capacitor, the microcontroller MCU12 in the voltage detection circuit 8 controls the analog-to-digital converter ADC15 to convert the electrical signals of the current transformer 16 and the voltage transformer 2 into digital signals. If the live wire and the neutral wire of the high voltage line are not short-circuited, then the neutral wire and the live wire will form a voltage, which is measured to be 30mV. If the neutral wire and the live wire are short-circuited, then the measured voltage is 0V.
[0028] The above are merely embodiments of this utility model. The circuits, electronic components, and modules involved are all prior art, fully achievable by those skilled in the art, and require no further explanation. The content protected by this application does not involve improvements to the software or methods. Commonly known structures and characteristics in the solution are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field to which this utility model pertains prior to the application date or priority date, are able to access all existing technologies in that field, and possess the ability to apply conventional experimental methods prior to that date. Those skilled in the art can, under the guidance of this application, improve and implement this solution in conjunction with their own capabilities. Some typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model. These should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent.
Claims
1. A short-circuit detection device for AC pile output based on capacitively coupled pulse signal, characterized in that: Includes a main controller (1), the output terminal of the main controller (1) is connected to the input terminal of the first safety capacitor C (5), the output terminal of the first safety capacitor C (5) is connected to the live wire (3), the live wire (3) is connected to the input terminal of the voltage detection circuit (8), the output terminal of the voltage detection circuit (8) is connected to the input terminal of the main controller (1), and the output terminal of the voltage detection circuit (8) is connected to the output terminal of the neutral wire (4).
2. The AC pile output short-circuit detection device based on capacitively coupled pulse signal as described in claim 1, characterized in that: The neutral line (4) is connected to the input terminal of the second safety capacitor C (6), and the output terminal of the second safety capacitor C (6) is connected to the first ground line (7).
3. The AC pile output short-circuit detection device based on capacitively coupled pulse signal as described in claim 2, characterized in that: The voltage detection circuit (8) includes a first control switch (9) connected to the live wire, and the output terminal of the first control switch (9) is connected to the input terminal of the first Y capacitor (13) and the current transformer (16).
4. The AC pile output short-circuit detection device based on capacitively coupled pulse signal as described in claim 3, characterized in that: The output terminal of the first Y capacitor (13) is connected to the microcontroller MCU (12), and the microcontroller MCU (12) is connected to the first control switch (9) and the ground wire.
5. The AC pile output short-circuit detection device based on capacitively coupled pulse signal as described in claim 4, characterized in that: The voltage detection circuit (8) further includes an ADC (15) connected to the output terminal of the current transformer (16). The output terminal of the ADC (15) is connected to the voltage transformer (2), and the input terminal of the voltage transformer (2) is connected to the output terminal of the current transformer (16).
6. The AC pile output short-circuit detection device based on capacitively coupled pulse signal as described in claim 5, characterized in that: The output terminal of the current transformer (16) is connected to the output terminal of the second control switch (11) and the second Y capacitor (14). The input terminals of the second control switch (11) and the second Y capacitor (14) are connected to the microcontroller MCU (12). The second control switch (11) is connected in series with the neutral line (4).