An opto-isolation device for high voltage measurement

Abstract

This utility model discloses an opto-isolation device for high-voltage measurement, comprising: a high-voltage side interface module for connecting to the high-voltage circuit under test; an opto-isolation module electrically connected to the high-voltage side interface module, including at least one optocoupler isolation device, which achieves electrical isolation between the high-voltage side and the low-voltage side through electro-optical-electro-electric conversion; a low-voltage side interface module connected to the output terminal of the opto-isolation module for outputting the isolated low-voltage signal; and a signal processing unit connected to the low-voltage side interface module for amplifying and filtering the isolated signal. This utility model achieves electrical isolation between high and low voltage through the opto-isolation module, preventing high voltage from entering the low-voltage circuit and ensuring the safety of equipment and personnel.

Description

Technical Field

[0001] This utility model belongs to the field of high voltage measurement technology, and in particular relates to an opto-isolation device for high voltage measurement. Background Technology

[0002] When measuring high voltage and current, the voltage of the circuit being measured can be as high as AC / DC 3.6KV. Although ordinary voltage or current sensors can convert high voltage into low voltage below 10V, they cannot isolate AC / DC 3.6KV. Without effective isolation measures, once an electrical fault occurs, the high voltage may be conducted to other low voltage circuit parts, causing equipment damage. More seriously, it may endanger the life safety of operators. Summary of the Invention

[0003] Purpose of the invention: In order to overcome the shortcomings of the existing technology, this utility model provides an opto-isolation device for high voltage measurement. The opto-isolation module realizes electrical isolation between high voltage and low voltage, prevents high voltage from entering the low voltage circuit, and ensures the safety of equipment and personnel.

[0004] Technical solution: To achieve the above objectives, this utility model provides an opto-isolation device for high-voltage measurement, comprising:

[0005] High-voltage side interface module, used to connect to the high-voltage circuit under test;

[0006] An opto-isolation module, electrically connected to the high-voltage side interface module, includes at least one optocoupler isolation device, which achieves electrical isolation between the high-voltage side and the low-voltage side through electro-optical-electrical conversion;

[0007] The low-voltage side interface module is connected to the output terminal of the opto-isolation module and is used to output the isolated low-voltage signal;

[0008] The signal processing unit, connected to the low-voltage side interface module, is used to amplify and filter the isolated signal.

[0009] Furthermore, the high-voltage side interface module is connected to the high-voltage circuit under test via a high-voltage resistant terminal or plug, and the voltage range of the high-voltage circuit under test is AC / DC 0-3.6kV; the low-voltage side interface module outputs an isolated low-voltage signal via a BNC interface or wiring terminal.

[0010] Furthermore, the optocoupler isolation device is a high-speed optocoupler with a response time of less than or equal to 5ms and an operating frequency range of 50Hz to 1kHz.

[0011] Furthermore, the insulating layer of the opto-isolation module is made of polyimide material with a withstand voltage rating greater than or equal to AC / DC 4kV, and the interlayer creepage distance is greater than or equal to 8mm.

[0012] Furthermore, it also includes a noise suppression circuit, which is integrated into the low-voltage side interface module and includes at least one low-pass filter capacitor and a common-mode choke.

[0013] Furthermore, a transient voltage suppression diode is provided between the high-voltage side interface module and the opto-isolation module to absorb transient overvoltages in the high-voltage circuit.

[0014] Furthermore, the signal processing unit includes an operational amplifier with an adjustable gain range of 10 to 100 times and an integrated temperature compensation circuit.

[0015] Furthermore, the outer shell of the opto-isolation device is made of flame-retardant V-0 grade engineering plastic, and the interior is potted with silicone insulating material to achieve curing.

[0016] Beneficial effects: This utility model achieves electrical isolation between high voltage and low voltage through an opto-isolation module, preventing high voltage from entering the low voltage circuit and ensuring the safety of equipment and personnel. The signal processing unit amplifies and filters the isolated signal, thereby improving measurement accuracy and anti-interference capability. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings.

[0019] like Figure 1 As shown, a high-voltage measurement opto-isolation device includes: a high-voltage side interface module 1 for connecting to the high-voltage circuit under test; an opto-isolation module 2 electrically connected to the high-voltage side interface module 1, including at least one optocoupler isolation device, which achieves electrical isolation between the high-voltage side and the low-voltage side through electro-optical-electro-electric conversion; a low-voltage side interface module 3 connected to the output terminal of the opto-isolation module 2 for outputting the isolated low-voltage signal; and a signal processing unit 4 connected to the low-voltage side interface module 3 for amplifying and filtering the isolated signal. This invention achieves electrical isolation between high and low voltage through the opto-isolation module 2, preventing high voltage from entering the low-voltage circuit and ensuring equipment and personnel safety. The signal processing unit 4 amplifies and filters the isolated signal, improving measurement accuracy and anti-interference capability.

[0020] The high-voltage side interface module 1 connects to the high-voltage circuit under test via high-voltage resistant terminals or plugs. The voltage range of the high-voltage circuit under test is AC / DC 0-3.6kV. The low-voltage side interface module 3 outputs an isolated low-voltage signal via a BNC interface or terminal block. The high-voltage resistant terminals or plugs ensure a stable connection of the high-voltage circuit, preventing breakdown and arcing, while the BNC interface or terminal block simplifies the low-voltage signal output, adapts to various measuring devices, and improves compatibility.

[0021] The optocoupler isolation device is a high-speed optocoupler with a response time of less than or equal to 5ms and an operating frequency range of 50Hz to 1kHz. Its fast response and high-frequency adaptability meet the needs of dynamic high-voltage measurement, such as power system harmonic detection, ensuring real-time performance and accuracy. Moreover, by limiting the high-speed optocoupler and the specific frequency range, it ensures that the device can still measure accurately under rapidly changing electrical signals (such as 1kHz) and avoid signal delay.

[0022] The insulating layer of the opto-isolation module 2 is made of polyimide material with a withstand voltage rating greater than or equal to AC / DC 4kV, and the creepage distance between layers is greater than or equal to 8mm. The use of high-voltage-resistant materials and increased creepage distance enhances insulation performance, prevents high-voltage breakdown or leakage current, and improves the long-term reliability of the opto-isolation module 2.

[0023] This invention also includes a noise suppression circuit, which is integrated into the low-voltage side interface module 3. The noise suppression circuit includes at least one low-pass filter capacitor 5 and a common-mode choke 6, which can effectively suppress common-mode noise and electromagnetic interference, improve the signal-to-noise ratio, and ensure the purity and stability of the signal output from the low-voltage side.

[0024] A transient voltage suppression diode 7 is installed between the high-voltage side interface module 1 and the opto-isolation module 2 to absorb transient overvoltages in the high-voltage circuit. The transient voltage suppression diode 7 (TVS) absorbs transient overvoltages (such as lightning strikes and switching surges), protects the optocoupler isolation device from damage, and enhances the device's shock resistance.

[0025] The signal processing unit 4 includes an operational amplifier 8 with an adjustable gain range of 10 to 100 times and an integrated temperature compensation circuit. The adjustable gain adapts to the high-voltage measurement requirements of different ranges, and the temperature compensation eliminates signal offset caused by changes in ambient temperature, ensuring measurement consistency.

[0026] The temperature compensation circuit can be implemented using two methods: thermistor feedback and digital compensation, as detailed below:

[0027] Method 1: Embed a thermistor in the feedback loop of operational amplifier 8. Its resistance changes with temperature. For example, when the temperature rises, the resistance of the thermistor decreases, automatically reducing the feedback resistance value and maintaining a constant gain.

[0028] Method 2: Collect ambient temperature through a temperature sensor, and dynamically adjust the parameters of operational amplifier 8 by the microcontroller, such as PWM control gain.

[0029] The outer shell 9 of the opto-isolation device is made of flame-retardant V-0 grade engineering plastic. The flame-retardant outer shell 9 can prevent fire risk, and the internal potting silicone insulating material is cured to enhance internal insulation and moisture resistance, ensuring the safety of the device in harsh environments.

[0030] This utility model also has the following advantages:

[0031] 1) High-voltage safety isolation: Optical isolation devices (electric-optical-electric conversion) and voltage-resistant insulation materials are used to achieve complete isolation between the AC / DC 3.6kV high-voltage side and the low-voltage side, avoiding the risk of electrical fault conduction;

[0032] 2) Dynamic performance optimization: High-speed optocouplers (≤5ms) and adjustable gain operational amplifiers support high-precision measurement with wide frequency range (50Hz-1kHz) and multiple ranges to meet the needs of complex working conditions;

[0033] 3) Anti-interference and stability: Integrated noise suppression, transient voltage suppression and temperature compensation functions significantly reduce the impact of noise, surge and temperature drift, ensuring pure and stable signal;

[0034] 4) Environmental adaptability: The flame-retardant shell and silicone potting structure enhance the durability and safety of the opto-isolation device in harsh environments such as high temperature and humidity.

[0035] In summary, the opto-isolation device of this invention combines high safety, strong anti-interference capability, fast response, and wide applicability, and can be widely used in high-voltage measurement scenarios such as power systems and industrial equipment, significantly reducing equipment damage and personal safety risks.

[0036] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A photoelectric isolation device for high voltage measurement, characterized in that: include: High-voltage side interface module (1), used to connect to the high-voltage circuit under test; The opto-isolation module (2) is electrically connected to the high-voltage side interface module (1) and includes at least one optocoupler isolation device, which realizes electrical isolation between the high-voltage side and the low-voltage side through electro-optical-electric conversion; The low-voltage side interface module (3) is connected to the output terminal of the opto-isolation module (2) and is used to output the isolated low-voltage signal; The signal processing unit (4) is connected to the low-voltage side interface module (3) and is used to amplify and filter the isolated signal.

2. The opto-isolation device for high-voltage measurement according to claim 1, characterized in that: The high-voltage side interface module (1) is connected to the high-voltage circuit under test through a high-voltage resistant terminal or plug. The voltage range of the high-voltage circuit under test is AC / DC 0-3.6kV. The low-voltage side interface module (3) outputs an isolated low-voltage signal through a BNC interface or a terminal block.

3. The opto-isolation device for high-voltage measurement according to claim 1, characterized in that: The optocoupler isolation device is a high-speed optocoupler with a response time of less than or equal to 5ms and an operating frequency range of 50Hz to 1kHz.

4. The opto-isolation device for high-voltage measurement according to claim 2, characterized in that: The insulating layer of the opto-isolation module (2) is made of polyimide material with a withstand voltage rating greater than or equal to AC / DC 4kV, and the interlayer creepage distance is greater than or equal to 8mm.

5. The opto-isolation device for high-voltage measurement according to claim 1, characterized in that: It also includes a noise suppression circuit, which is integrated in the low-voltage side interface module (3) and includes at least one low-pass filter capacitor (5) and a common-mode choke (6).

6. The opto-isolation device for high-voltage measurement according to claim 1, characterized in that: A transient voltage suppression diode (7) is provided between the high-voltage side interface module (1) and the opto-isolation module (2) to absorb transient overvoltages in the high-voltage circuit.

7. The opto-isolation device for high-voltage measurement according to claim 1, characterized in that: The signal processing unit (4) includes an operational amplifier (8) with an adjustable gain range of 10 to 100 times and an integrated temperature compensation circuit.

8. The opto-isolation device for high voltage measurement according to claim 1, characterized in that: The outer shell (9) of the opto-isolation device is made of flame-retardant V-0 grade engineering plastic, and is internally potted with silicone insulating material to achieve curing.

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