CN201750141U - Intelligent overvoltage protection module - Google Patents

Abstract

The utility model provides an intelligent overvoltage protection module. The front end of the intelligent overvoltage protection module consists of a discharge tube or a voltage dependent resistor which is connected with ground and a thermistor which is connected in a line in series. The rear end of the intelligent overvoltage protection module consists of an adjustable reference power supply, a detection comparison loop and an electronic switch. According to the different voltage classes of the power supply or the signal line of a high-sensitivity circuit, by adjusting a knob and setting reference voltage, the reference voltage is enabled to correspond to the limit service voltage of the high-sensitivity circuit. Overvoltage detected by a detection loop is compared with set voltage. The electronic switch is controlled to enable the high-sensitivity circuit to be cut off with external overvoltage and to enable the external overvoltage to be conducted with the ground. By adopting one-stage or multi-stage protection, after the overvoltage which is far higher than the working voltage and the overcurrent are decreased to a certain extent, the electronic switch is controlled by the comparison circuit to prevent the high-sensitivity circuit from being damaged by the external overvoltage. After lightning overvoltage and the like are eliminated, the protection module is restored to a normal state and the normal operation of the circuit is not affected.

Description

The intelligence over-voltage protection module

Technical field

The utility model relates to a kind of over-voltage protection module, especially relates to a kind of intelligent over-voltage protection module that is used for multiple different electric pressures, belongs to the lightning protection of electric power, electronic circuit and the overvoltage protection of other form.

Background technology

Existing like product generally is made up of nonlinear devices such as discharging gap devices such as discharge tube and piezo-resistances; can only be used for same electric pressure; the circuit of the different electric pressures in the same system will be with the voltage protection module of similar shape not number; and because the consistency of device is poor; general work voltage is bigger with the voltage difference that needs protection; low-voltage circuit particularly; sometimes reach several times even tens times; so existing like product can only not be that highstrung electronic circuit is protected to overvoltage; and when the power supply of multiple grade being arranged, can only be equipped with multiple different protection module in same system inside.

Therefore, be necessary to design a kind of intelligent over-voltage protection module that can overcome above-mentioned shortcoming, to satisfy the overvoltage protection needs of different electric pressures.

Summary of the invention

Technical problem to be solved in the utility model is: the intelligent over-voltage protection module that the overvoltage protection of a kind of overvoltage protection that can solve the electronic circuit of different brackets, sensitive electronic circuit is provided.

The technical scheme that the utility model adopted is: a kind of intelligent over-voltage protection module; it is characterized in that; described intelligent over-voltage protection module front end is made up of the discharge tube that links to each other with ground or piezo-resistance and string thermistor in the line; intelligence over-voltage protection module rear end is by the adjustable reference power supply; detecting comparison loop and electronic switch forms; described discharge tube is connected with thermistor; described piezo-resistance is in parallel with discharge tube; described electronic switch is connected with the detection comparison loop; described adjustable reference power supply is connected with the detection comparison loop; described detection comparison loop is used for decision circuitry and whether has the overvoltage situation; and control electronic switch break-make, thereby realize the over-voltage protection module function.The technique effect that brings thus is at least: this intelligent over-voltage protection module by one or more levels protection to after exceeding a lot of overvoltage of operating voltage, overcurrent and being reduced to certain degree; again by comparison circuit control electronic switch; make high sensitive circuit not be subjected to the damage of exterior overvoltage; after overvoltage such as thunderbolt; protection module returns to normal condition again, does not influence the operate as normal of circuit.

Aforesaid intelligent over-voltage protection module is characterized in that: described piezo-resistance is a non-linear element, on the described discharge tube and piezo-resistance, is used for voltage clamp at clamp voltage.The technique effect that brings thus is at least: when voltage surpasses the clamp voltage of piezo-resistance; described piezo-resistance can be with voltage clamp at clamp voltage; the residual voltage of overvoltage after by the front-end protection circuit passed through, and can stop the infringement to high sensitive circuit of big electric current that overvoltage produces.

Aforesaid intelligent over-voltage protection module is characterized in that: described thermistor is the PTC thermistor, and thermistor is a non-linear element, is used to stop the infringement of the big electric current of overvoltage generation to high sensitive circuit.The technique effect that brings thus is at least: when the electric current that flows through thermistor arrives to a certain degree greatly, its temperature of described thermistor increases, resistance increases rapidly, and the hundreds of thousands of resistance doubly can stop the infringement of the big electric current of overvoltage generation to high sensitive circuit when being normal temperature.

The beneficial effects of the utility model are: intelligent over-voltage protection module of the present utility model by one or more levels protection to after exceeding a lot of overvoltage of operating voltage, overcurrent and being reduced to certain degree; again by comparison circuit control electronic switch; make high sensitive circuit not be subjected to the damage of exterior overvoltage; after overvoltage such as thunderbolt; protection module returns to normal condition again, does not influence the operate as normal of circuit.Present electronic product is to miniaturization, highly integrated, low-voltage, the low-power consumption direction develops, the functional module overvoltage ability of a lot of high integration does not have the good of traditional devices, conventional operation voltage is the relay of 220V, the withstand voltage test meeting is accomplished more than the 1000V before dispatching from the factory, some places use more than the 2000V, and the general utility functions integrated package can not use under its ceiling voltage for a long time, and the highest working voltage of these functional modules is generally all lower, have only several volts, tens volts or tens volts, with existing like product can't the assurance function integrated package and product normally protect.The intelligence over-voltage protection module can be by the different requirements of electronic equipment or product, regulate the requirement of its comparative voltage (minimum can be no more than ten volts) different electric pressures of adaptation.

Description of drawings

Fig. 1 is the circuit theory diagrams of the utility model intelligence over-voltage protection module.

Fig. 2 is the external cabling schematic diagram of the utility model intelligence over-voltage protection module.

Embodiment

Below in conjunction with drawings and Examples the utility model is described in further detail.

Intelligent over-voltage protection module of the present utility model make by one or more levels protection the surge of high-voltage large currents such as thunderbolt be reduced to 1000V and following after; detect the overvoltage that measure in the loop; compare with setting voltage; the control electronic switch; high sensitive circuit and exterior overvoltage are disconnected, and make external overvoltage and ground conducting.

As shown in Figure 1, the intelligent over-voltage protection module front end of present embodiment is made up of the discharge tube that links to each other with ground or piezo-resistance and string thermistor in the line.On the power supply of high sensitive circuit or input/output interface, install intelligent over-voltage protection module additional; power supply and input/output interface are in normal voltage range the time; discharge tube or piezo-resistance are in high-impedance state; thermistor is under normal temperature; be in low resistive state; do not influence the normal operation of system; when having thunderbolt or external high pressure, scurries into outside line; when voltage is higher than the dc breakdown voltage of discharge tube; the discharge tube conducting; shorted to earth; transient current can reach thousands of amperes; the overvoltage electric energy is released over the ground; to be on the safe side; on discharge tube and piezo-resistance; when voltage surpasses the clamp voltage of piezo-resistance; piezo-resistance is a non-linear element; with voltage clamp at clamp voltage; by the PTC thermistor, thermistor is a non-linear element to overvoltage by the residual voltage behind the front-end protection circuit, when the electric current that flows through thermistor arrives to a certain degree greatly; its temperature increases; resistance increases rapidly, and the hundreds of thousands of resistance doubly stops the infringement to high sensitive circuit of big electric current that overvoltage produces in the time of can be for normal temperature.When if the voltage at A, B place is tens kilovolts, by the different voltages of high sensitive circuit, select the discharge tube or the piezo-resistance of different electric pressures, the voltage that C, D are ordered can be reduced to volt more than tens to 1,000.

Intelligence over-voltage protection module rear end is made up of adjustable reference power supply, detection comparison loop and electronic switch.According to the different electric pressures of the power supply or the holding wire of high sensitive circuit, by adjusting knob, set reference voltage, make reference voltage corresponding with the limit working voltage of high sensitive circuit.Detecting comparison loop detects at C, the magnitude of voltage that D is ordered, the passing ratio decay, compare with reference voltage, if the value after the decay is no more than reference voltage, that is to say C, the magnitude of voltage that D is ordered is no more than the limit working voltage of high sensitive circuit, detect comparison loop and be in initial shape, be failure to actuate, electronic switch KS1 is in the state of cut-offfing, electronic switch KS2, KS3 is in conducting state, and high sensitive circuit system normally moves, otherwise, the detection comparison loop provides signal makes electronic switch KS1 conducting, C, D point shorted to earth, overvoltage is released over the ground, simultaneously electronic switch KS2, KS3 disconnects, overvoltage and high sensitive circuit are isolated, thereby guarantee that high sensitive circuit is not subjected to superpotential infringement.After having served as loss of voltage, detect comparison loop and reply initial shape, high sensitive circuit is replied normal operation.

As shown in Figure 2; intelligent over-voltage protection module of the present utility model is at object of protection and outside inlet wire one end that is connected; owing to have high-voltage great-current overvoltage such as thunder and lightning; adopt the strong overvoltage protecting devices such as piezo-resistance of overcurrent capability to exceed a lot of overvoltage Limiting in certain scope than operating voltage; judge by comparison circuit again; when voltage is higher than setting voltage; the break-make of control circuit; make overvoltage and sensitive circuit isolate or release over the ground; when needs adapt to different electric pressure, need only regulate the height of setting voltage.Owing to adopt accurate comparison circuit, be adapted to high sensitive electronic circuit especially.

The beneficial effects of the utility model are: intelligent over-voltage protection module of the present utility model by one or more levels protection to after exceeding a lot of overvoltage of operating voltage, overcurrent and being reduced to certain degree; again by comparison circuit control electronic switch; make high sensitive circuit not be subjected to the damage of exterior overvoltage; after overvoltage such as thunderbolt; protection module returns to normal condition again, does not influence the operate as normal of circuit.Present electronic product is to miniaturization, highly integrated, low-voltage, the low-power consumption direction develops, the functional module overvoltage ability of a lot of high integration does not have the good of traditional devices, conventional operation voltage is the relay of 220V, the withstand voltage test meeting is accomplished more than the 1000V before dispatching from the factory, some places use more than the 2000V, and the general utility functions integrated package can not use under its ceiling voltage for a long time, and the highest working voltage of these functional modules is generally all lower, have only several volts, tens volts or tens volts, with existing like product can't the assurance function integrated package and product normally protect.The intelligence over-voltage protection module can be by the different requirements of electronic equipment or product, regulate the requirement of its comparative voltage (minimum can be no more than ten volts) different electric pressures of adaptation.

Claims (3)

1. intelligent over-voltage protection module; it is characterized in that; described intelligent over-voltage protection module front end is made up of the discharge tube that links to each other with ground or piezo-resistance and string thermistor in the line; intelligence over-voltage protection module rear end is by the adjustable reference power supply; detecting comparison loop and electronic switch forms; described discharge tube is connected with thermistor; described piezo-resistance is in parallel with discharge tube; described electronic switch is connected with the detection comparison loop; described adjustable reference power supply is connected with the detection comparison loop; described detection comparison loop is used for decision circuitry and whether has the overvoltage situation; and control electronic switch break-make, thereby realize the over-voltage protection module function.

2. intelligent over-voltage protection module according to claim 1 is characterized in that: described piezo-resistance is a non-linear element, on the described discharge tube and piezo-resistance, is used for voltage clamp at clamp voltage.

3. intelligent over-voltage protection module according to claim 1 is characterized in that: described thermistor is the PTC thermistor, and thermistor is a non-linear element, is used to stop the infringement of the big electric current of overvoltage generation to high sensitive circuit.

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