A low-voltage isolation type electric shock prevention control device

Abstract

The utility model discloses a low -voltage isolation type anti -electric shock control device belongs to low -voltage isolation type anti -electric shock control technical field contains safety ring isolation transformer device, leakage protection device and load, wherein, the input end connection 220V municipal power output end of safety ring isolation transformer device, the input end connection of leakage protection device's output end connection of safety ring isolation transformer device's output end is connected, and the output end of leakage protection device is connected with load. Utilize the principle that isolation transformer load side and power side municipal power have electrical isolation, form high -resistance isolation, even if load side leakage, human touches also can not form ground return circuit, has the isolation effect, so can not lead to electric shock, the safe electricity management and control ability obtains the further enhancement, and the electricity safety level obtains the further promotion, and the commonality is strong, is applicable to various low -voltage electrical equipment, and the protection range is big, installs the device at low -voltage total outlet, and all low -voltage electricity after its back end can be protected.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage isolated electric shock protection control technology, and in particular to a low-voltage isolated electric shock protection control device. Background Technology

[0002] Low-voltage electricity use has always been chaotic, with messy wiring, unclear markings, and aging insulation lacking effective measures to prevent electric shock, posing a significant risk of electric shock. For example, the electricity used in street light boxes, bus stop signs, and advertising boards is prone to leakage and electric shock hazards when it rains and water accumulates.

[0003] Therefore, this utility model aims to reduce the occurrence of electric shock accidents and lower the risk to workers by researching a low-voltage isolation type of electric shock prevention technology. This project was established to promote the development of the company's business. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a low-voltage isolation type anti-electric shock control device to address the shortcomings of the prior art.

[0005] To solve the above-mentioned technical problems, this utility model adopts the following technical solution:

[0006] A low-voltage isolated electric shock protection control device includes a safety ring isolation transformer device, a leakage current protection device, and a load;

[0007] The input terminal of the safety ring isolation transformer is connected to the 220V AC mains output terminal, the output terminal of the safety ring isolation transformer is connected to the input terminal of the leakage current protection device, and the output terminal of the leakage current protection device is connected to the load.

[0008] As a further preferred embodiment of the low-voltage isolation type anti-electric shock control device of this utility model, the safety ring isolation transformer includes a ring core;

[0009] The primary winding wound on the toroidal iron core;

[0010] The first insulating layer covering the outer surface of the primary winding;

[0011] A conductive shielding layer disposed outside the first insulating layer, the conductive shielding layer having a non-closed structure and being provided with a grounding lead;

[0012] A second insulating layer covering the outer surface of the conductive shielding layer;

[0013] The secondary winding is wound outside the second insulation layer.

[0014] As a further preferred embodiment of the low-voltage isolation type electric shock protection control device of this utility model, the leakage protection device includes a zero-sequence current transformer, a signal conditioning module, a controller module, a drive module, a mechanical tripping mechanism, an arc extinguishing system, a self-testing module, a status indication module, and a power supply module; the zero-sequence current transformer is connected to the controller module through the signal conditioning module, the controller module is connected to the mechanical tripping mechanism through the drive module, and the arc extinguishing system, the self-testing module, the status indication module, and the power supply module are respectively connected to the controller module.

[0015] As a further preferred embodiment of the low-voltage isolation type anti-electric shock control device of this utility model, the drive module adopts a high-speed, high-current capability MOSFET / IGBT to drive the trip coil.

[0016] As a further preferred embodiment of the low-voltage isolation type anti-electric shock control device of this utility model, the mechanical tripping mechanism adopts a permanent magnet assisted tripping mechanism with low friction design and high energy utilization.

[0017] As a further preferred embodiment of the low-voltage isolation type anti-electric shock control device of this utility model, the signal conditioning module includes an amplification circuit and a dual operational amplifier bandpass filter, which is used to amplify and filter the acquired data before inputting it into the signal conversion circuit, greatly reducing signal noise and signal loss in the measurement. The amplification circuit consists of an OPA277 operational amplifier and resistors and capacitors, and the dual operational amplifier bandpass filter consists of two OPA277 operational amplifiers.

[0018] As a further preferred embodiment of the low-voltage isolation type anti-electric shock control device of this utility model, the signal conditioning module includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first operational amplifier, a second operational amplifier, and a third operational amplifier. The signal input -IN terminal is connected to one end of the first resistor; the other end of the first resistor is connected to one end of the first capacitor, one end of the third resistor, and the negative power supply pin of the first operational amplifier; the other end of the first capacitor is connected to the other end of the third resistor and the output pin of the first operational amplifier; the signal input +IN terminal is connected to one end of the second resistor; and the other end of the second resistor is connected to the first operational amplifier. The positive power supply pin of the amplifier is connected to one end of the fourth resistor and one end of the second capacitor. The other end of the second capacitor is connected to the other end of the fourth resistor and grounded. The output pin of the first operational amplifier is connected to one end of the fifth resistor. The other end of the fifth resistor is connected to the positive power supply pin of the second operational amplifier. The negative power supply pin of the second operational amplifier is connected to the negative power supply pin of the third operational amplifier. The positive power supply pin of the third operational amplifier is connected to one end of the eighth resistor and one end of the ninth resistor. The other end of the ninth resistor is grounded. The other end of the eighth resistor is connected to one end of the seventh resistor and the output pin of the second operational amplifier. The other end of the seventh resistor is connected to one end of the fourth capacitor. The other end of the fourth capacitor is connected to one end of the ninth resistor. The other end of the ninth resistor is connected to one end of the third capacitor. The other end of the third capacitor is grounded.

[0019] Compared with the prior art, the present invention, by adopting the above technical solution, has the following technical effects:

[0020] This utility model discloses a low-voltage isolation type anti-electric shock control device, comprising a safety ring isolation transformer, a leakage current protection device, and a load. Utilizing the principle of electrical isolation between the load side and the mains power supply side of the isolation transformer, a high-resistance isolation is formed. Even if there is a leakage on the load side, a human body touching it will not form a grounding circuit, thus providing isolation and preventing electric shock. The device further enhances the ability to manage safe electricity use and improves the level of electrical safety. It is highly versatile and applicable to various low-voltage electrical equipment. It has a wide protection range; by installing the device at the low-voltage main outgoing line, all low-voltage electrical equipment downstream of it can be protected. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a circuit design diagram of a low-voltage isolation type anti-electric shock control device according to this utility model;

[0023] Figure 2 This is a schematic diagram of the structure of a low-voltage isolation type anti-electric shock control device according to this utility model;

[0024] Figure 3 This is a schematic diagram of the leakage current protection device of this utility model;

[0025] Figure 4 This is a circuit diagram of the signal conditioning module of this utility model. Detailed Implementation

[0026] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings:

[0027] 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.

[0028] like Figure 1 and Figure 2 The low-voltage isolation type electric shock protection control device includes a safety ring isolation transformer device, a leakage protection device, and a load.

[0029] The input terminal of the safety ring isolation transformer is connected to the 220V AC mains output terminal, the output terminal of the safety ring isolation transformer is connected to the input terminal of the leakage current protection device, and the output terminal of the leakage current protection device is connected to the load.

[0030] By utilizing the principle of electrical isolation between the load side and the mains power supply side of the isolation transformer, a high-resistance isolation is formed. Even if there is a leakage current on the load side, a human body will not form a grounding loop when touched, thus providing an isolation function and preventing electric shock.

[0031] The device mainly includes a safety ring-shaped isolation transformer, a leakage current protection device, and a load. The input terminal of the isolation transformer is connected to the 220V mains output terminal, the output terminal of the isolation transformer is connected to the input terminal of the short-circuit protection device, and the output terminal of the short-circuit protection device is connected to the load. This further strengthens the ability to manage safe electricity use and improves the level of electrical safety.

[0032] It is highly versatile and suitable for various low-voltage electrical equipment.

[0033] With a wide protection range, the device can be installed at the low-voltage main outgoing line, protecting all low-voltage electrical supplies downstream of it.

[0034] As a further preferred embodiment of the low-voltage isolation type anti-electric shock control device of this utility model, the safety ring isolation transformer includes a ring core;

[0035] The primary winding wound on the toroidal iron core;

[0036] The first insulating layer covering the outer surface of the primary winding;

[0037] A conductive shielding layer disposed outside the first insulating layer, the conductive shielding layer having a non-closed structure and being provided with a grounding lead;

[0038] A second insulating layer covering the outer surface of the conductive shielding layer;

[0039] The secondary winding is wound outside the second insulation layer.

[0040] like Figure 3 As shown, the leakage current protection device includes a zero-sequence current transformer, a signal conditioning module, a controller module, a drive module, a mechanical tripping mechanism, an arc extinguishing system, a self-testing module, a status indication module, and a power supply module. The zero-sequence current transformer is connected to the controller module through the signal conditioning module, and the controller module is connected to the mechanical tripping mechanism through the drive module. The arc extinguishing system, the self-testing module, the status indication module, and the power supply module are all connected to the controller module.

[0041] The drive module uses a high-speed, high-current MOSFET / IGBT to drive the trip coil.

[0042] The mechanical tripping mechanism adopts a low-friction design and a permanent magnet assisted tripping mechanism with high energy utilization.

[0043] The zero-sequence current transformer (ZCT) adopts a nanocrystalline alloy core and a balanced differential winding structure;

[0044] The core processing module is configured to execute a real-time leakage current detection algorithm based on improved differential integral and to achieve dynamic threshold adjustment; the self-test module is configured to periodically simulate and generate test current and to perform closed-loop detection of the actual operating state of the mechanical tripping mechanism.

[0045] The real-time leakage current detection algorithm based on improved differential integration includes: high-speed sampling of the differential signal output from the secondary side of the ZCT; calculation of the differential value between adjacent sampling points; integration of the differential value sequence; comparison of the integration result with a threshold dynamically adjusted according to the environmental noise level; and determination of leakage current fault and triggering of the drive module when the integration result exceeds the threshold.

[0046] The method for adjusting the dynamic threshold is as follows: real-time monitoring of the background noise amplitude output by the signal conditioning module; finding the corresponding trigger threshold in a preset mapping table or by calculation function based on the noise amplitude; the greater the noise, the higher the trigger threshold.

[0047] The self-test module includes: a controllable current source, a simulated load resistor, a switching switch, and a feedback sensor for detecting the action of the tripping mechanism. During the self-test cycle, the core processing module controls the switching switch to connect the test current generated by the controllable current source to the primary circuit of the ZCT and flow through the simulated load resistor, while simultaneously monitoring the status of the feedback sensor to confirm whether the tripping mechanism has successfully operated.

[0048] The drive module adopts a high-speed MOSFET drive circuit, and the mechanical tripping mechanism adopts a low-friction design and includes a permanent magnet assisted tripping element.

[0049] like Figure 4 As shown, the signal conditioning module includes an amplifier circuit and a dual op-amp bandpass filter, which is used to amplify and filter the acquired data before inputting it into the signal conversion circuit, greatly reducing signal noise and signal loss during measurement. The amplifier circuit consists of an OPA277 operational amplifier and resistors and capacitors, and the dual op-amp bandpass filter consists of two OPA277 operational amplifiers.

[0050] The signal conditioning module includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first operational amplifier, a second operational amplifier, and a third operational amplifier. The signal input -IN terminal is connected to one end of the first resistor. The other end of the first resistor is connected to one end of the first capacitor, one end of the third resistor, and the negative power supply pin of the first operational amplifier. The other end of the first capacitor is connected to the other end of the third resistor and the output pin of the first operational amplifier. The signal input +IN terminal is connected to one end of the second resistor. The other end of the second resistor is connected to the positive power supply pin of the first operational amplifier and one end of the fourth resistor. One end of the second capacitor is connected to the other end of the fourth resistor and grounded. The output pin of the first operational amplifier is connected to one end of the fifth resistor. The other end of the fifth resistor is connected to the positive power supply pin of the second operational amplifier. The negative power supply pin of the second operational amplifier is connected to the negative power supply pin of the third operational amplifier. The positive power supply pin of the third operational amplifier is connected to one end of the eighth resistor and one end of the ninth resistor. The other end of the ninth resistor is grounded. The other end of the eighth resistor is connected to one end of the seventh resistor and the output pin of the second operational amplifier. The other end of the seventh resistor is connected to one end of the fourth capacitor. The other end of the fourth capacitor is connected to one end of the ninth resistor. The other end of the ninth resistor is connected to one end of the third capacitor. The other end of the third capacitor is grounded.

[0051] The signal processing circuit includes an amplifier circuit and a dual op-amp bandpass filter. It amplifies and filters the data acquired by the sensor before inputting it to the signal conversion circuit, significantly reducing signal noise and signal loss during measurement. The amplifier circuit consists of an OPA277 operational amplifier and resistors / capacitors, forming a typical differential amplifier circuit. C3 and R6, and C4 and R7 form a low-pass filter. The dual op-amp bandpass filter, composed of two OPA277 operational amplifiers, has adjustable Q-value and center frequency. Adjusting R9 adjusts the resonant frequency, and adjusting R8 adjusts the Q-value.

[0052] This utility model discloses a low-voltage isolation type anti-electric shock control device, comprising a safety ring isolation transformer, a leakage current protection device, and a load. Utilizing the principle of electrical isolation between the load side and the mains power supply side of the isolation transformer, a high-resistance isolation is formed. Even if there is a leakage on the load side, a human body touching it will not form a grounding circuit, thus providing isolation and preventing electric shock. The device further enhances the ability to manage safe electricity use and improves the level of electrical safety. It is highly versatile and applicable to various low-voltage electrical equipment. It has a wide protection range; by installing the device at the low-voltage main outgoing line, all low-voltage electrical equipment downstream of it can be protected.

[0053] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless defined as herein.

[0054] The above embodiments are merely illustrative of the technical concept of this utility model and should not be construed as limiting the scope of protection of this utility model. Any modifications made to the technical solution based on the technical concept proposed in this utility model shall fall within the scope of protection of this utility model. The implementation methods of this utility model have been described in detail above, but this utility model is not limited to the above-described implementation methods. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this utility model.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A low-voltage isolation type electric shock protection control device, characterized in that: It includes a safety ring isolation transformer, a leakage protection device, and a load; The input terminal of the safety ring isolation transformer is connected to the 220V AC mains output terminal, the output terminal of the safety ring isolation transformer is connected to the input terminal of the leakage current protection device, and the output terminal of the leakage current protection device is connected to the load.

2. The low-voltage isolation type electric shock prevention control device according to claim 1, characterized in that: The safety toroidal isolation transformer includes a toroidal core; The primary winding wound on the toroidal iron core; The first insulating layer covering the outer surface of the primary winding; A conductive shielding layer disposed outside the first insulating layer, the conductive shielding layer having a non-closed structure and being provided with a grounding lead; A second insulating layer covering the outer surface of the conductive shielding layer; The secondary winding is wound outside the second insulation layer.

3. The low-voltage isolation type anti-electric shock control device according to claim 1, characterized in that: The leakage current protection device includes a zero-sequence current transformer, a signal conditioning module, a controller module, a drive module, a mechanical tripping mechanism, an arc extinguishing system, a self-testing module, a status indication module, and a power supply module. The zero-sequence current transformer is connected to the controller module through the signal conditioning module, and the controller module is connected to the mechanical tripping mechanism through the drive module. The arc extinguishing system, the self-testing module, the status indication module, and the power supply module are all connected to the controller module.

4. The low-voltage isolation type electric shock prevention control device according to claim 3, characterized in that: The drive module uses a high-speed, high-current MOSFET / IGBT to drive the trip coil.

5. A low-voltage isolation type anti-electric shock control device according to claim 3, characterized in that: The mechanical tripping mechanism adopts a low-friction design and a permanent magnet assisted tripping mechanism with high energy utilization.

6. A low-voltage isolation type electric shock prevention control device according to claim 3, characterized in that: The signal conditioning module includes an amplifier circuit and a dual op-amp bandpass filter, which amplifies and filters the acquired data before inputting it into the signal conversion circuit, greatly reducing signal noise and signal loss during measurement. The amplifier circuit consists of an OPA277 operational amplifier and resistors and capacitors, while the dual op-amp bandpass filter consists of two OPA277 operational amplifiers.

7. A low-voltage isolation type electric shock prevention control device according to claim 6, characterized in that: The signal conditioning module includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first operational amplifier, a second operational amplifier, and a third operational amplifier. The signal input -IN terminal is connected to one end of the first resistor. The other end of the first resistor is connected to one end of the first capacitor, one end of the third resistor, and the negative power supply pin of the first operational amplifier. The other end of the first capacitor is connected to the other end of the third resistor and the output pin of the first operational amplifier. The signal input +IN terminal is connected to one end of the second resistor. The other end of the second resistor is connected to the positive power supply pin of the first operational amplifier and one end of the fourth resistor. One end of the second capacitor is connected to the other end of the fourth resistor and grounded. The output pin of the first operational amplifier is connected to one end of the fifth resistor. The other end of the fifth resistor is connected to the positive power supply pin of the second operational amplifier. The negative power supply pin of the second operational amplifier is connected to the negative power supply pin of the third operational amplifier. The positive power supply pin of the third operational amplifier is connected to one end of the eighth resistor and one end of the ninth resistor. The other end of the ninth resistor is grounded. The other end of the eighth resistor is connected to one end of the seventh resistor and the output pin of the second operational amplifier. The other end of the seventh resistor is connected to one end of the fourth capacitor. The other end of the fourth capacitor is connected to one end of the ninth resistor. The other end of the ninth resistor is connected to one end of the third capacitor. The other end of the third capacitor is grounded.

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