CN222052615U - An overvoltage protection device for electrical equipment - Google Patents

Abstract

The utility model discloses an overvoltage protection device for electrical equipment. The technology includes a control circuit, a protection circuit and a power supply, the power supply is connected to the electrical equipment through a power supply wire, the control circuit includes a power supply module, the power supply module is electrically connected to the power supply module, the power supply module is electrically connected to a controller, the controller is electrically connected to a first drive chip and a second drive chip respectively, the protection circuit is connected in series to the power supply wire, the protection circuit is provided with a first circuit and a second circuit, the first circuit and the second circuit are connected in parallel, the first circuit is connected in series with a first relay, the second circuit is connected in series with a second relay and a step-down transformer, the first drive chip is electrically connected to the first relay, the second drive chip is electrically connected to the second relay, the electrical equipment is electrically connected to a voltage sensor, and the voltage sensor is connected to the controller in communication. The utility model does not cause a sudden power outage, which may damage the electronic components in the electrical equipment.

Description

Overvoltage protection device for electrical equipment

Technical Field

The utility model relates to the field of overvoltage protection devices, in particular to an overvoltage protection device of electrical equipment.

Background

In many industries in modern society, electrical equipment is used. Meanwhile, in order to prevent damage to the electrical equipment during use due to excessive voltage, an overvoltage protection device is arranged. The overvoltage protection device of the prior electrical equipment can give out a warning sound to prompt the staff when the overvoltage condition occurs, and simultaneously carry out emergency power-off protection. However, the overvoltage protection device of the existing electrical equipment has the following problems: when the overvoltage protection device of the existing electrical equipment performs emergency power-off protection, the electrical equipment is suddenly powered off, so that electronic components in the electronic equipment are damaged, and a hard disk is the electronic component with the most serious damage.

Based on the above situation, the present utility model proposes an overvoltage protection device for an electrical apparatus, so as to effectively solve the above problems.

Disclosure of utility model

In order to solve the problems existing in the background art, the utility model provides an overvoltage protection device of electrical equipment.

The utility model adopts the following technical scheme:

An overvoltage protection device for an electrical apparatus prevents sudden power failure from damaging electronic components in the electrical apparatus.

The overvoltage protection device of the electrical equipment comprises a control circuit, a protection circuit and a power supply, wherein the power supply is connected with the electrical equipment through a power supply wire, the control circuit comprises an electricity taking module, the electricity taking module is electrically connected with the power supply, the electricity taking module is electrically connected with a controller, the controller is respectively electrically connected with a first driving chip and a second driving chip, the protection circuit is connected on the power supply wire in series, the protection circuit is provided with a first circuit and a second circuit, the first circuit and the second circuit are connected in parallel, a first relay is connected on the first circuit in series, a second relay and a step-down transformer are connected on the second circuit in series, the first driving chip is electrically connected with the first relay, the second driving chip is electrically connected with the second relay, the electrical equipment is electrically connected with a voltage sensor for detecting the power supply voltage, the voltage sensor is in communication connection with the controller, the controller is used for receiving and processing voltage data transmitted by the voltage sensor, and the controller controls the opening and closing of the first relay through the first driving chip and the second relay through the second driving chip.

Further, still include the protective housing, the speaker is installed at the top of protective housing, and the speaker is connected with the controller electricity, and the controller is used for controlling opening and close of speaker, gets electric module, second driver chip, first driver chip and controller and all installs the inside of protective housing.

Further, an access hole communicated with the inside and the outside is formed in the front side wall of the protective shell, and an access cover for sealing the access hole is hinged in the access hole.

Further, a display screen is mounted on the front side wall of the access cover, and the display screen is electrically connected with the controller.

Further, the inside level of protective housing is provided with the mounting panel.

Further, the left side wall and the right side wall of the protective shell are provided with heat dissipation openings.

Further, a filter screen is arranged in the heat dissipation port.

The utility model provides an electric appliance overvoltage protection device for equipment: when the overvoltage condition appears, break off first circuit through first relay, communicate the second circuit through the second relay simultaneously, behind the second circuit intercommunication, step down through step down transformer, the electric current after the step down, continue to supply power to electrical equipment again to carry out overvoltage protection to electrical equipment, the condition of breaking off the power suddenly can not appear simultaneously, make the electronic component in the electrical equipment receive the damage.

Drawings

FIG. 1 is a circuit block diagram of the present utility model;

FIG. 2 is a flow chart of the present utility model;

FIG. 3 is a schematic diagram of the structure of the present utility model;

Fig. 4 is a schematic view of the front side of fig. 3.

The sequence numbers marked in the figures are represented as follows: the power supply system comprises a 1-control circuit, a 2-power taking module, a 3-second driving chip, a 4-second relay, a 5-step-down transformer, 6-electrical equipment, a 7-voltage sensor, an 8-protection circuit, a 9-first relay, a 10-power supply, an 11-first driving chip, a 12-controller, a 13-display screen, a 14-loudspeaker, a 15-protection shell, a 16-filter screen, a 17-mounting plate and an 18-access cover.

Detailed Description

The utility model is described in further detail below with reference to the drawings and the detailed description.

Reference is made to fig. 1-4.

Examples

The overvoltage protection device of the electrical equipment comprises a control circuit 1, a protection circuit 8 and a power supply 10, wherein the power supply 10 is connected with the electrical equipment 6 through a power supply wire, and in actual application, the power supply 10 supplies power to the electrical equipment 6 through the power supply wire so that the electrical equipment 6 normally operates;

The power supply comprises a power taking module 2, wherein the power taking module 2 is electrically connected with a power supply 10, the power taking module 2 is electrically connected with a controller 12, the controller 12 is respectively electrically connected with a first driving chip 11 and a second driving chip 3, and the whole text of the section forms a control circuit 1;

In practical application, the power taking module 2 is connected with the power supply 10 through a wire, the power taking module 2 is connected with the controller 12 through a wire, and the first driving chip 11 and the second driving chip 3 are respectively connected with the controller 12 through wires; in practical application, the controller 12 may be a single-chip microcomputer or a PLC controller; in actual application, the power is taken through the power taking module 2, and strong current provided by the power supply 10 is converted into weak current for the control circuit 1 to use;

The power supply wire is connected with a first circuit and a second circuit in series, the first circuit and the second circuit are connected in parallel, the first circuit is connected with a first relay 9 in series, the second circuit is connected with a second relay 4 and a step-down transformer 5 in series, and the whole text of the section forms a protection circuit 8; further preferably, the step-down transformer 5 may be a step-down transformer 5;

In practical application, the relay is in the prior art, is an electric control device, is generally applied to an automatic control circuit, and is actually an automatic switch which uses small current to control large current to operate, so that the relay plays roles of automatic adjustment, safety protection, circuit switching and the like in a circuit;

In practical application, the step-down transformer 5 is in the prior art, and the step-down transformer 5 converts the higher voltage at the input end into the ideal voltage with relatively lower output, so as to achieve the purpose of step-down;

The first driving chip 11 is electrically connected with the first relay 9, the second driving chip 3 is electrically connected with the second relay 4, the electric equipment 6 is electrically connected with the voltage sensor 7 for detecting the power supply voltage, and in actual application, the first driving chip 11 is connected with the first relay 9 through a wire, the second driving chip 3 is connected with the second relay 4 through a wire, and the electric equipment 6 is connected with the voltage sensor 7 through a wire;

In practical application, the voltage sensor 7 is a sensor capable of sensing the measured voltage and converting the measured voltage into a usable output signal, and in various automatic detection and control systems, tracking acquisition is often required for high-speed alternating current and direct current voltage signals, and spectrum analysis is performed for relatively complex voltage waveforms

The voltage sensor 7 is in communication connection with a controller 12, the controller 12 is used for receiving and processing voltage data transmitted by the voltage sensor 7, the controller 12 controls the on-off of the first relay 9 through the first driving chip 11, and controls the on-off of the second relay 4 through the second driving chip 3; in practice, the voltage sensor 7 is connected to the controller 12 via a twisted pair.

In this embodiment, in a normal state, the first relay 9 connects the first line, and the second relay 4 disconnects the second line. In this embodiment, during specific application, the voltage sensor 7 monitors the power supply voltage of the electrical equipment 6 in real time, the step-down transformer 5 transmits the collected voltage value to the controller 12, the controller 12 processes the data, if the power supply voltage is normal, the data are kept normal, when an overvoltage condition occurs, the controller 12 controls the first relay 9 to disconnect the first circuit through the first driving chip 11, meanwhile, the controller 12 controls the second relay 4 to connect the second circuit through the second driving chip 3, after the second circuit is connected, the step-down transformer 5 on the second circuit steps down the overvoltage current, so that the overvoltage current is reduced by a normal value, and the voltage is reduced to a current of a normal value, and then the power supply is continuously performed on the electrical equipment 6, so that the electrical equipment 6 can normally operate, and thus the electrical equipment 6 is protected from overvoltage, and meanwhile, the electronic element in the electrical equipment 6 is damaged without sudden power failure.

Examples

The technology will be further described in this embodiment, and the device further includes a protective housing 15, where a speaker 14 is installed on top of the protective housing 15, as shown in fig. 3 and 4; in practical application, the loudspeaker 14 can be replaced by a buzzer;

The loudspeaker 14 is electrically connected with the controller 12, the controller 12 is used for controlling the on-off of the loudspeaker 14, and the power taking module 2, the second driving chip 3, the first driving chip 11 and the controller 12 are all arranged in the protective shell 15, and when in practical application, the loudspeaker 14 is connected with the controller 12 through wires; the power taking module 2, the second driving chip 3, the first driving chip 11 and the controller 12 are all installed inside the protective case 15, which is not shown in the drawing.

In this embodiment, when an overvoltage condition occurs, the controller 12 starts the speaker 14, and sends out an alarm through the speaker 14, so as to remind the staff; the power taking module 2, the second driving chip 3, the first driving chip 11 and the controller 12 are protected by a protective shell 15.

Examples

In this embodiment, to further illustrate the technology, the front side wall of the protective shell 15 is provided with an access hole with an inside and an outside communicated, and an access cover 18 for sealing the access hole is hinged in the access hole, as shown in fig. 4; in practice, access cover 18 is hinged in the access opening by a hinge or hinges;

Further, as shown in fig. 4, a display screen 13 is mounted on the front side wall of the access cover 18, and the display screen 13 is electrically connected with the controller 12; in practical application, the display 13 is connected with the controller 12 through a wire.

In the embodiment, the maintenance and replacement of the power taking module 2, the second driving chip 3, the first driving chip 11 and the controller 12 inside the protective shell 15 are facilitated through the access cover 18; the detected voltage value is displayed in real time through the display screen 13, so that the operator can check conveniently.

Examples

The technology will be further described in this embodiment, and the mounting plate 17 is horizontally disposed inside the protective shell 15, as shown in fig. 3; in practical application, the power taking module 2, the second driving chip 3, the first driving chip 11 and the controller 12 are conveniently installed inside the protective shell 15 through the installation plate 17;

For further explanation, as shown in fig. 3, the left and right side walls of the protective shell 15 are provided with heat dissipation openings, and the inside of the heat dissipation openings is provided with a filter screen 16; during practical application, dispel the heat the cooling through the inside of thermovent to protective housing 15, prevent that the temperature of protective housing 15 from being too high, prevent through filter screen 16 that outside dust from entering into the inside of protective housing 15.

The structures of the above embodiments are specifically:

and the electricity taking module is used for: the overvoltage protection power taking module is a power supply function and is used for cutting off a power supply when the input voltage exceeds a preset value so as to protect electronic equipment from being damaged by high-voltage surges. Generally comprises the following key components:

1. Voltage monitoring circuit: the circuit is responsible for monitoring the input voltage in real time, and a protection mechanism is triggered once the voltage is detected to exceed a set safety range.

2. And (2) a control switch: after an overvoltage condition is detected, the control switch is turned off, thereby cutting off the power supply and preventing an excessive voltage from reaching the electronic device.

3. Feedback mechanism: some advanced overvoltage protection modules also include a feedback mechanism, which can automatically restore power when the voltage returns to a normal range, thereby reducing the inconvenience of the device caused by power failure.

4. And (3) a voltage stabilizing loop: in some designs, the overvoltage protection module may be used in conjunction with a voltage regulation loop to ensure that the output voltage does not exceed a design threshold even in the event of a user mishandling or internal failure, thereby protecting the consumer at a later stage.

5. A voltage dividing network: in an overvoltage protection circuit, there is typically a voltage divider network consisting of resistors for reducing the output voltage to a level that can be compared with a reference voltage (Vref) for overvoltage determination.

6. Protection element: such as transient suppression diodes (TVS), metal Oxide Varistors (MOVs), etc., are used to absorb or limit excessive voltages and to protect the circuit from damage.

7. Auxiliary circuit: filters, isolators, etc. may be included to improve the overall performance and reliability of the module.

The design and application of an overvoltage protection power take-off module is critical to ensure safe operation of electronic equipment. They can not only prevent damage due to power supply fluctuations, but also improve the stability and reliability of the system. In selecting an overvoltage protection module, the appropriate protection level and parameters should be determined according to the specific application requirements and sensitivity of the device.

And (3) a controller: the controller of the overvoltage protection device is mainly responsible for cutting off the power supply or reducing the voltage when the power supply voltage exceeds a preset threshold value so as to protect the electronic element from damage, is a key component for ensuring the safe operation of the electronic equipment, and avoids damage caused by voltage abnormality through an accurate control and protection mechanism. In selecting an overvoltage protection device, appropriate protection levels and parameters should be determined according to specific requirements and sensitivity of the device to ensure reliability and stability of the system.

The first driving chip and the second driving chip: IR2214, LM2901M, etc. may be used.

For example, NSD1015XT is a single channel gate driver designed specifically for driving IGBT and SiC MOSFETs. When the circuit protection driving chip is selected, the proper model is required to be determined according to specific application scenes and requirements. For example, if used for motor driving, overheat protection circuitry may need to be considered; for power conversion systems, over-current and over-voltage protection are important. Knowing the working principle and the applicable conditions of various protection functions is helpful to select a proper protection driving chip to ensure the safe and stable operation of the circuit

Step-down transformer: the step-down transformer converts the higher voltage of the input end into the ideal voltage with relatively lower output, thereby achieving the purpose of step-down, and the model is common.

A voltage sensor: the voltage is typically measured using model L100 (AV 100 for LEM), which is 2500V greater. The voltage sensor is a commonly used voltage sensor in the sensor industry, the production process is complex, the primary coil turns are larger, and the application range is limited.

Note that the above is only a preferred embodiment of the present utility model and the technical principle applied. It will be understood by those skilled in the art that the present utility model is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the utility model. Therefore, while the utility model has been described in connection with the above embodiments, the utility model is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the utility model, which is set forth in the following claims.

Claims (7)

1. An overvoltage protection device for electrical equipment, comprising a control circuit (1), a protection circuit (8) and a power supply (10), wherein the power supply (10) is connected to the electrical equipment (6) via a power supply wire, and wherein the control circuit (1) comprises a power supply module (2), wherein the power supply module (2) is electrically connected to the power supply (10), wherein the power supply module (2) is electrically connected to a controller (12), wherein the controller (12) is electrically connected to a first drive chip (11) and a second drive chip (3), respectively, wherein the protection circuit (8) is connected in series to the power supply wire, wherein the protection circuit (8) is provided with a first circuit and a second circuit, wherein the first circuit and the second circuit are connected in parallel, and wherein the first circuit is connected in series to a first drive chip (11) and a second drive chip (3). A relay (9), a second relay (4) and a step-down transformer (5) are connected in series on the second line, a first drive chip (11) is electrically connected to the first relay (9), a second drive chip (3) is electrically connected to the second relay (4), the electrical device (6) is electrically connected to a voltage sensor (7) for detecting a power supply voltage, the voltage sensor (7) is communicatively connected to a controller (12), the controller (12) is used to receive and process voltage data transmitted by the voltage sensor (7), and the controller (12) controls the opening and closing of the first relay (9) through the first drive chip (11), and controls the opening and closing of the second relay (4) through the second drive chip (3). 2. The overvoltage protection device for electrical equipment according to claim 1, characterized in that it also includes a protective shell (15), a speaker (14) is installed on the top of the protective shell (15), the speaker (14) is electrically connected to the controller (12), the controller (12) is used to control the opening and closing of the speaker (14), and the power supply module (2), the second drive chip (3), the first drive chip (11) and the controller (12) are all installed inside the protective shell (15). 3. The overvoltage protection device for electrical equipment according to claim 2, characterized in that: an inspection opening communicating with the inside and the outside is opened on the front side wall of the protective shell (15), and an inspection cover (18) is hinged inside the inspection opening for sealing the inspection opening. 4. The overvoltage protection device for electrical equipment according to claim 3, characterized in that a display screen (13) is installed on the front side wall of the inspection cover (18), and the display screen (13) is electrically connected to the controller (12). 5. The overvoltage protection device for electrical equipment according to claim 4, characterized in that a mounting plate (17) is horizontally arranged inside the protective shell (15). 6. The overvoltage protection device for electrical equipment according to claim 2, characterized in that heat dissipation openings are provided on both the left and right side walls of the protective shell (15). 7. The overvoltage protection device for electrical equipment according to claim 6, characterized in that a filter (16) is installed in the heat dissipation port.