CN103972862B - One automatically resets thunder-proof type overvoltage/undervoltage protection device - Google Patents
One automatically resets thunder-proof type overvoltage/undervoltage protection device Download PDFInfo
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Abstract
The invention discloses one to automatically reset thunder-proof type overvoltage/undervoltage protection device; including lightning protection unit module, power supply and voltage sampling module, bound voltage comparison module, crossing under-voltage time delays recovery module, driving and state indicator module, described lightning protection unit module is by electric fuse and power supply and voltage sample circuit module.When the present invention has lightning surge in supply line, it is possible to release lightning wave energy and suppression lightning surge；When supply line makes supply voltage overvoltage or under-voltage occur for a certain reason, it is possible to automatically disconnect supply line；Supply voltage recovers after normal power supply, can automatically reset within the time of regulation, it is ensured that electrical equipment properly functioning.
Description
Technical field
The present invention relates to one automatically reset thunder-proof type overvoltage/undervoltage protection device, belong to thunder and lightning science and technology field.
Background technology
Along with developing rapidly of China's industrial technology, various automatizatioies, digitized electrical equipment enter huge numbers of families, therefore the requirement to grid supply quality is more and more higher, and the quality that electrical network is powered includes that scope range of the fluctuation of voltage, the distortion factor of waveform, the frequency range etc. of voltage clearly require.The current phenomenon of the failure often occurred in low-voltage power supply system has: center line open circuit, phase line connect anti-and threephase load seriously imbalance etc. with center line, thus cause single phase power supply system that the situation of overvoltage or under-voltage occurs, electric equipment is made to cause damage, user to suffer bigger economic loss.Two is the lightning surge electrostatic induction mainly due to thunder and lightning and the principle of electromagnetic induction, makes to induce on transmission line of electricity lightning surge, and these lightning surges are incorporated on electrical equipment by cable, causes and damages on equipment.
Product to overvoltage, low-voltage protection has following several form the most both at home and abroad: the suppression of lightning surge uses surge protector; electrical equipment need independently installed; it is typically mounted at by the front end of protection electrical equipment, the release action to lightning wave energy can be played.The protector of overvoltage and under-voltage is frequently with the surge protector of single electrical equipment, and this protector typically exports less about about the 10A of electric current.The additional under-voltage of miniature circuit breaker and overvoltage electrical apparatus release, its advantage be implement easily, energy consumption little, easy for installation, shortcoming is that electrical network service restoration normally can not close automatically after protection act, needs manual operation.Full-automatic voltage protector; for when the supply voltage in circuit exceedes the electrical equipment artificial boundary of permission; auto power off; protection electrical equipment is unlikely to cause device damage because of overvoltage, under-voltage; but when lightning surge occurs in supply line, not there is the rejection ability to lightning surge.
Summary of the invention
The technical problem to be solved is to provide one and automatically resets thunder-proof type overvoltage/undervoltage protection device; when supply line has lightning surge; the release to lightning wave energy and the suppression of lightning surge can be played, thus protect electrical equipment not to be struck by lightning and cause damage；When supply line makes supply voltage overvoltage or under-voltage occur for a certain reason, this device can disconnect supply line automatically, makes electrical equipment be unlikely to because of mistake, under-voltage and damages；When supply voltage recovers after normal power supply, can automatically reset within the time of regulation, it is ensured that electrical equipment properly functioning.
The present invention solves above-mentioned technical problem by the following technical solutions:
The present invention provides one to automatically reset thunder-proof type overvoltage/undervoltage protection device; including lightning protection unit module, power supply and voltage sampling module, bound voltage comparison module, crossing under-voltage time delays recovery module, driving and state indicator module, described lightning protection unit module is connected with voltage sample circuit module with power supply by electric fuse；
After this device accesses mains-power circuit, civil power first passes through lightning protection unit module, and when there being lightning surge in electrical network, the amplitude of lightning surge is limited in permission voltage range by lightning protection unit module；If electrical network does not has lightning surge, when electrical network is powered normal, after supply voltage carries out blood pressure lowering by lightning protection unit module transfer to power supply and voltage sampling module, rectification, filtering, voltage stabilizing process, a road as voltage sampling, another road as the benchmark DC source of this device；
The bound voltage comparison module voltage signal monitoring line voltage by sampling; when sampling voltage signal is not in the range of preset bound; bound voltage comparison module outputed signal to under-voltage time delays and recovered the outfan of module; the input making driving and state indicator module is low level; disconnect major loop, thus realize the overvoltage/undervoltage to line voltage and protect；When sampling voltage signal is in the range of preset bound, bound voltage comparison module no signal exports, and crosses under-voltage time delays recovery module and outputs signal to drive and state indicator module after time delay, connects major loop, it is achieved the function automatically recovered.
Described lightning protection unit module includes the first Zinc-oxide piezoresistor, second Zinc-oxide piezoresistor, 3rd Zinc-oxide piezoresistor, Thermal Cutoffs, first inductance, second inductance, wherein: described one end of first Zinc-oxide piezoresistor is connected with one end of Thermal Cutoffs, the other end of the first Zinc-oxide piezoresistor respectively with zero line, one end of second Zinc-oxide piezoresistor, one end of second inductance, ground wire connects, the other end of Thermal Cutoffs respectively with live wire, one end of first inductance connects, the other end ground connection of the second Zinc-oxide piezoresistor, the other end of the first inductance and one end of the 3rd Zinc-oxide piezoresistor connect, the other end of the second inductance and the other end of the 3rd Zinc-oxide piezoresistor connect；
First Zinc-oxide piezoresistor, the second Zinc-oxide piezoresistor play the effect that lightning wave energy discharges over the ground, when the first Zinc-oxide piezoresistor has leakage current in the line, first Zinc-oxide piezoresistor heating, Thermal Cutoffs disconnects automatically, and Thermal Cutoffs plays anti-on fire, the effect of blast；First inductance, the second inductance are decoupling component, it is possible to reduce the effect of the steepness of thunder and lightning.
Described power supply and voltage sampling module include transformator, the first diode, the second diode, the 3rd diode, the 4th diode, the first filter capacitor, the second filter capacitor, three terminal regulator, the first resistance, the second resistance, wherein: one end of transformer primary side is connected with the common port of the first inductance in lightning protection unit circuit and the 3rd Zinc-oxide piezoresistor by electric fuse, the common port of the other end and the second inductance and the 3rd Zinc-oxide piezoresistor connects；One end of transformer secondary is connected with negative electrode, the anode of the second diode of the first diode respectively, and the other end is connected with negative electrode, the 4th diode anode of the 3rd diode respectively；The negative electrode of the second diode is connected with the negative electrode of the 4th diode, one end of the first resistance, the positive pole of the first filter capacitor, the input of three terminal regulator respectively, and the other end of the first resistance and one end of the second resistance connect；The anode of the first diode is connected with the anode of the 3rd diode, the other end of the second resistance, the negative pole of the first filter capacitor, the earth terminal of three terminal regulator, the negative pole of the second filter capacitor respectively；The outfan of three terminal regulator and the positive pole of the second filter capacitor connect；
First diode, the second diode, the 3rd diode, the 4th diode constitute rectifier bridge；First resistance, the second resistance constitute voltage sample circuit, and the voltage signal that the second resistance takes out is used for reacting the situation of change of line voltage；The output voltage at the second filter capacitor two ends is as the DC source of benchmark.
Further prioritization scheme as the present invention, described bound voltage comparison module includes the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the first integrated operational amplifier, the second integrated operational amplifier, the 5th diode, the 6th diode, wherein: one end of the 3rd resistance is connected with benchmark DC source, the other end is connected with in-phase input end, one end of the 4th resistance of the first integrated operational amplifier respectively；One end of 5th resistance is connected with benchmark DC source, and the other end is connected with inverting input, one end of the 6th resistance of the second integrated operational amplifier respectively；The other end of the 4th resistance and the other end of the 6th resistance ground connection respectively；The outfan of the first integrated operational amplifier and the negative electrode of the 5th diode connect, and the outfan of the second integrated operational amplifier and one end of the 6th diode connect；Upper voltage limit is inputted by the inverting input of the first integrated operational amplifier, lower voltage limit is inputted by the normal phase input end of the second integrated operational amplifier, as the output port of bound voltage comparison module after the anode of the 5th diode and the anode connection of the 6th diode；Upper voltage limit is inputted by the inverting input of the first integrated operational amplifier, and lower voltage limit is inputted by the normal phase input end of the second integrated operational amplifier.
Further prioritization scheme as the present invention, described under-voltage time delays recovery module of crossing includes the 7th resistance, the 8th resistance, the 9th resistance, the tenth resistance, the 3rd integrated operational amplifier, the 4th integrated operational amplifier, the 3rd electric capacity, wherein: one end of the 7th resistance is connected with benchmark DC source, the other end is connected with one end of the 9th resistance, the normal phase input end of the 3rd integrated operational amplifier, the inverting input of the 4th integrated operational amplifier, one end of the tenth resistance respectively；Recover the first output port of module, the other end ground connection of the tenth resistance as under-voltage time delays excessively after the other end of the 9th resistance and the outfan connection of the 3rd integrated operational amplifier；One end of 8th resistance is connected with benchmark DC source, and the other end is connected with the inverting input of the 3rd integrated operational amplifier, the output port of bound voltage comparison module, the normal phase input end of the 4th integrated operational amplifier, one end of the 3rd electric capacity respectively；The other end ground connection of the 3rd electric capacity, the outfan of the 4th integrated operational amplifier recovers the second output port of module as crossing under-voltage time delays.
Further prioritization scheme as the present invention, described driving and state indicator module include the 11st resistance, the 12nd resistance, the 13rd resistance, the 14th resistance, the 15th resistance, the first audion, the second audion, the 3rd audion, solid-state relay, the 7th diode, the 8th diode, wherein: the 11st resistance one end is connected with the first output port crossing under-voltage time delays recovery module, and the base stage of the other end and the first audion connects；One end of 12nd resistance is connected with the second output port crossing under-voltage time delays recovery module, and the base stage of the other end and the second audion connects；One end of 13rd resistance is connected with the second output port crossing under-voltage time delays recovery module, and the base stage of the other end and the 3rd audion connects；The colelctor electrode of the first audion is connected with one end of solid-state relay, the other end ground connection of solid-state relay；The colelctor electrode of the second audion is connected by the negative electrode of the 14th resistance and the 7th diode, the plus earth of the 7th diode；The colelctor electrode of the 3rd audion is connected by the negative electrode of the 15th resistance and the 8th diode, the plus earth of the 8th diode；First audion, the second audion, the equal ground connection of emitter stage of the 3rd audion.
As the further prioritization scheme of the present invention, the described delay time crossing under-voltage time delays recovery module process is 30s.
As the further prioritization scheme of the present invention, the voltage signal magnitude that described second resistance takes out is 7V.
As the further prioritization scheme of the present invention, the DC source of described benchmark is+12V.
As the further prioritization scheme of the present invention, described upper voltage limit is 8.5V, and lower voltage limit is 5.5V.
The present invention uses above technical scheme compared with prior art; jumbo solid-state relay and drive circuit is used to use the principle of hysteresis comparator; having stable performance, power consumption is little and controls the feature that voltage accuracy is high, it is achieved that the overvoltage/undervoltage of line voltage is protected and automatically reset.When the present invention has lightning surge in supply line, it is possible to release lightning wave energy and suppression lightning surge；When supply line makes supply voltage overvoltage or under-voltage occur for a certain reason, it is possible to automatically disconnect supply line；Supply voltage recovers after normal power supply, can automatically reset within the time of regulation, it is ensured that electrical equipment properly functioning.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention.
Fig. 2 is lightning protection unit circuit diagram.
Fig. 3 is power supply and voltage sample circuit figure.
Fig. 4 is bound voltage comparator circuit figure.
Fig. 5 was under-voltage time delays restoring circuit figure.
Fig. 6 is to drive and condition indication circuit figure.
Detailed description of the invention
Embodiments of the present invention are described below in detail, and the example of described embodiment is shown in the drawings, and the most same or similar label represents same or similar element or has the element of same or like function.The embodiment described below with reference to accompanying drawing is exemplary, is only used for explaining the present invention, and is not construed as limiting the claims.
It is understood that unless expressly stated, singulative used herein " ", " one ", " described " and " being somebody's turn to do " may also comprise plural form to those skilled in the art of the present technique.Should be further understood that, the wording used in the description of the present invention " includes " referring to there is described feature, integer, step, operation, element and/or assembly, but it is not excluded that existence or adds other features one or more, integer, step, operation, element, assembly and/or their group.It should be understood that when we claim element to be " connected " or during " coupled " to another element, and it can be directly connected or coupled to other elements, or can also there is intermediary element.Additionally, " connection " used herein or " coupling " can include wireless connections or couple.Wording "and/or" used herein includes one or more any cell listing item being associated and all combinations.
Those skilled in the art of the present technique it is understood that unless otherwise defined, all terms used herein (including technical term and scientific terminology) have with the those of ordinary skill in art of the present invention be commonly understood by identical meaning.Should also be understood that those terms defined in such as general dictionary should be understood that have the meaning consistent with the meaning in the context of prior art, and unless defined as here, will not explain by idealization or the most formal implication.
Below in conjunction with the accompanying drawings technical scheme is described in further detail:
The present invention designs one and automatically resets thunder-proof type overvoltage/undervoltage protection device; as shown in Figure 1; including lightning protection unit module, power supply and voltage sampling module, bound voltage comparison module, crossing under-voltage time delays recovery module, driving and state indicator module, described lightning protection unit module is connected with voltage sample circuit module with power supply by electric fuse；
After this device accesses mains-power circuit, civil power first passes through lightning protection unit module, and when there being lightning surge in electrical network, the amplitude of lightning surge is limited in the permission voltage range of electrical equipment and this device by lightning protection unit module；If electrical network does not has lightning surge, when electrical network is powered normal, after supply voltage carries out blood pressure lowering by lightning protection unit module transfer to power supply and voltage sampling module, rectification, filtering, voltage stabilizing process, a road as voltage sampling, another road as the benchmark DC source of this device；
The bound voltage comparison module voltage signal monitoring line voltage by sampling; when sampling voltage signal is not in the range of preset bound; bound voltage comparison module outputed signal to under-voltage time delays and recovered the outfan of module; the input making driving and state indicator module is low level; disconnect major loop, thus realize the overvoltage/undervoltage to line voltage and protect；When sampling voltage signal is in the range of preset bound, bound voltage comparison module no signal exports, and crosses under-voltage time delays recovery module and outputs signal to drive and state indicator module after time delay, connects major loop, it is achieved the function automatically recovered.
nullDescribed lightning protection unit module is as shown in Figure 2，Including the first Zinc-oxide piezoresistor Rn1、Second Zinc-oxide piezoresistor Rn2、3rd Zinc-oxide piezoresistor Rn3、Thermal Cutoffs Rt、First inductance L1、Second inductance L2，Wherein: described one end of first Zinc-oxide piezoresistor Rn1 is connected with one end of Thermal Cutoffs Rt，The other end of the first Zinc-oxide piezoresistor Rn1 respectively with zero line N、One end of second Zinc-oxide piezoresistor Rn2、One end of second inductance L2、Ground wire PE connects，The other end of Thermal Cutoffs Rt respectively with live wire L、One end of first inductance L1 connects，The other end ground connection of the second Zinc-oxide piezoresistor Rn2，The other end of the first inductance L1 and one end of the 3rd Zinc-oxide piezoresistor Rn3 connect，The other end of the second inductance L2 and the other end of the 3rd Zinc-oxide piezoresistor Rn3 connect；
First Zinc-oxide piezoresistor Rn1, the second Zinc-oxide piezoresistor Rn2 play the effect that lightning wave energy discharges over the ground, when the first Zinc-oxide piezoresistor Rn1 has leakage current in the line, first Zinc-oxide piezoresistor Rn1 heating, Thermal Cutoffs Rt disconnects automatically, and Thermal Cutoffs Rt plays anti-on fire, the effect of blast；First inductance L1, the second inductance L2 are decoupling component, it is possible to reduce the effect of the steepness of thunder and lightning；Second Zinc-oxide piezoresistor Rn2 plays the effect of clamp between line, the differential mode overvoltage of thunder and lightning is limited in the voltage range that equipment can bear.
Described power supply is with voltage sampling module as shown in Figure 3, including transformator, the first diode D1, the second diode D2, the 3rd diode D3, the 4th diode D4, the first filter capacitor C1, the second filter capacitor C2, three terminal regulator, the first resistance R1, the second resistance R2, wherein: one end of transformer primary side is connected with the common port of the first inductance L1 and the 3rd Zinc-oxide piezoresistor Rn3 in lightning protection unit circuit by electric fuse, the common port of the other end and the second inductance L2 and the 3rd Zinc-oxide piezoresistor Rn3 connects；One end of transformer secondary is connected with negative electrode, the anode of the second diode D2 of the first diode D1 respectively, and the other end is connected with negative electrode, the anode of the 4th diode D4 of the 3rd diode D3 respectively；The negative electrode of the second diode D2 is connected with the negative electrode of the 4th diode D4, one end of the first resistance R1, the positive pole of the first filter capacitor C1, the input of three terminal regulator respectively, and the other end of the first resistance R1 and one end of the second resistance R2 connect；The anode of the first diode D1 is connected with the anode of the 3rd diode D3, the other end of the second resistance R2, the negative pole of the first filter capacitor C1, the earth terminal of three terminal regulator, the negative pole of the second filter capacitor C2 respectively；The outfan of three terminal regulator and the positive pole of the second filter capacitor C2 connect；
First diode D1, the second diode D2, the 3rd diode D3, the 4th diode D4 constitute rectifier bridge；First resistance R1, the second resistance R2 constitute voltage sample circuit, and the voltage signal V1 that the second resistance R2 takes out is used for reacting the situation of change of line voltage, and the amplitude of its voltage signal is 7V；The output voltage of second filter capacitor C2 two ends Vc1, Vc2 is as the DC source of benchmark, and its magnitude of voltage is+12V.
Described bound voltage comparison module is as shown in Figure 4, including the 3rd resistance R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the first integrated operational amplifier IC1, the second integrated operational amplifier IC2, the 5th diode D5, the 6th diode D6, wherein: one end of the 3rd resistance R3 is connected with+12V benchmark DC source, the other end is connected with in-phase input end, one end of the 4th resistance R4 of the first integrated operational amplifier IC1 respectively；One end of 5th resistance R5 is connected with+12V benchmark DC source, and the other end is connected with inverting input, one end of the 6th resistance R6 of the second integrated operational amplifier IC2 respectively；The other end of the 4th resistance R4 and the other end of the 6th resistance R6 ground connection respectively；The outfan of the first integrated operational amplifier IC1 and the negative electrode of the 5th diode D5 connect, and the outfan of the second integrated operational amplifier IC2 and one end of the 6th diode D6 connect；Upper voltage limit V2 is inputted by the inverting input of the first integrated operational amplifier IC1, lower voltage limit V3 is inputted by the normal phase input end of the second integrated operational amplifier IC2, as the output port V01 of bound voltage comparison module after the anode of the 5th diode D5 and the anode connection of the 6th diode D6；Upper voltage limit is inputted by the inverting input of the first integrated operational amplifier IC1, and lower voltage limit is inputted by the normal phase input end of the second integrated operational amplifier IC2, and described upper voltage limit is 8.5V, and lower voltage limit is 5.5V.
Described under-voltage time delays of crossing recovers module as shown in Figure 5, including the 7th resistance R7, the 8th resistance R8, the 9th resistance R9, the tenth resistance R10, the 3rd integrated operational amplifier IC3, the 4th integrated operational amplifier IC4, the 3rd electric capacity C3, wherein: one end of the 7th resistance R7 is connected with+12V benchmark DC source, the other end is connected with one end of the 9th resistance R9, the normal phase input end of the 3rd integrated operational amplifier IC3, the inverting input of the 4th integrated operational amplifier IC4, one end of the tenth resistance R10 respectively；Recover the first output port V0 of module, the other end ground connection of the tenth resistance R10 as under-voltage time delays excessively after the other end of the 9th resistance R9 and the outfan connection of the 3rd integrated operational amplifier IC3；One end of 8th resistance R8 is connected with+12V benchmark DC source, and the other end is connected with the inverting input of the 3rd integrated operational amplifier IC3, the output port of bound voltage comparison module, the normal phase input end of the 4th integrated operational amplifier IC4, one end of the 3rd electric capacity C3 respectively；The other end ground connection of the 3rd electric capacity C3, the outfan of the 4th integrated operational amplifier IC4 recovers the second output port V02 of module as crossing under-voltage time delays.
Described driving and state indicator module are as shown in Figure 6, including the 11st resistance R11, the 12nd resistance R12, the 13rd resistance R13, the 14th resistance R14, the 15th resistance R15, the first audion T1, the second audion T2, the 3rd audion T3, solid-state relay, the 7th diode D7, the 8th diode D8, wherein: one end of the 11st resistance R11 is connected with the first output port V0 crossing under-voltage time delays recovery module, and the base stage of the other end and the first audion T1 connects；The second output port V02 of module is recovered in one end of 12nd resistance R12 with crossing under-voltage time delays, and the base stage of the other end and the second audion T2 connects；One end of 13rd resistance R13 is connected with the second output port V02 crossing under-voltage time delays recovery module, and the base stage of the other end and the 3rd audion T3 connects；The colelctor electrode of the first audion T1 is connected with one end of solid-state relay, the other end ground connection of solid-state relay；The colelctor electrode of the second audion T2 is connected by the negative electrode of the 14th resistance R14 and the 7th diode D7, the plus earth of the 7th diode D7；The colelctor electrode of the 3rd audion T3 is connected by the negative electrode of the 15th resistance R15 and the 8th diode D8, the plus earth of the 8th diode D8；First audion T1, the second audion T2, the equal ground connection of emitter stage of the 3rd audion T3.
The workflow of the present invention is: when there being lightning surge in supply lines, and lightning protection unit circuit works, and the amplitude of lightning surge is limited in the permission voltage range of electrical equipment and this device, not only protects electrical equipment but also protect this device.During without lightning surge, when electrical network is powered normal, supply voltage passes through lightning protection unit circuit, delivers to power circuit and carries out blood pressure lowering, rectification, filtering, voltage stabilizing etc., the alternating current of civil power 220V becomes the road sampling as voltage, and another road is as the direct current supply of circuit；Bound voltage comparator circuit monitors line voltage continuously by voltage sample circuit, when monitor line voltage within the limits prescribed time, bound voltage comparator circuit not output signal；Delay circuit outputs signal to drive circuit after time delay, makes solid-state relay close, and connects major loop, and status indicator lamp the 7th diode D7 is bright is green.
When there is overvoltage or under-voltage in the scope that line voltage exceedes regulation; bound voltage comparator circuit by voltage sample circuit monitor line voltage overvoltage or under-voltage occur time; output signal is added to the outfan of delay circuit; the input making drive circuit reduces to low level; drive circuit output signal makes solid-state relay disconnect; i.e. disconnecting major loop, now status indicator lamp the 8th diode D8 is bright is red, has been achieved in that the overvoltage/undervoltage to line voltage is protected；When bound voltage comparator circuit detects that line voltage is in the range of normal, bound voltage comparator circuit not output signal, in delay circuit, electric capacity is charged, charging complete after about 30s, the input of drive circuit is high level, and drive circuit output signal makes solid-state relay close, and main circuit is connected, status indicator lamp the 7th diode D7 now is bright is green, it is achieved the function automatically replied.
The above; it is only the detailed description of the invention in the present invention; but protection scope of the present invention is not limited thereto; any it is familiar with the people of this technology in the technical scope that disclosed herein; it is appreciated that the conversion or replacement expected; all should contain within the scope of the comprising of the present invention, therefore, protection scope of the present invention should be as the criterion with the protection domain of claims.
Claims (8)
1. the thunder-proof type overvoltage/undervoltage protection device that automatically resets; it is characterized in that; this device includes lightning protection unit module, power supply and voltage sampling module, bound voltage comparison module, crosses under-voltage time delays recovery module, driving and state indicator module, and described lightning protection unit module is connected with voltage sampling module with power supply by electric fuse；
After this device accesses mains-power circuit, civil power first passes through lightning protection unit module, and when there being lightning surge in electrical network, the amplitude of lightning surge is limited in permission voltage range by lightning protection unit module；If electrical network does not has lightning surge, when electrical network is powered normal, after supply voltage carries out blood pressure lowering by lightning protection unit module transfer to power supply and voltage sampling module, rectification, filtering, voltage stabilizing process, a road as voltage sampling, another road as the benchmark DC source of this device；
The bound voltage comparison module voltage signal monitoring line voltage by sampling; when sampling voltage signal is not in the range of preset bound; bound voltage comparison module outputed signal to under-voltage time delays and recovered the outfan of module; the input making driving and state indicator module is low level; disconnect major loop, thus realize the overvoltage/undervoltage to line voltage and protect；When sampling voltage signal is in the range of preset bound, bound voltage comparison module no signal exports, and crosses under-voltage time delays recovery module and outputs signal to drive and state indicator module after time delay, connects major loop, it is achieved the function automatically recovered；
nullWherein，Described lightning protection unit module includes the first Zinc-oxide piezoresistor (Rn1)、Second Zinc-oxide piezoresistor (Rn2)、3rd Zinc-oxide piezoresistor (Rn3)、Thermal Cutoffs (Rt)、First inductance (L1)、Second inductance (L2)，Wherein: one end of described first Zinc-oxide piezoresistor (Rn1) is connected with one end of Thermal Cutoffs (Rt)，The other end of the first Zinc-oxide piezoresistor (Rn1) respectively with zero line (N)、One end of second Zinc-oxide piezoresistor (Rn2)、One end of second inductance (L2)、Ground wire (PE) connects，The other end of Thermal Cutoffs (Rt) respectively with live wire (L)、One end of first inductance (L1) connects，The other end ground connection of the second Zinc-oxide piezoresistor (Rn2)，The other end of the first inductance (L1) and one end of the 3rd Zinc-oxide piezoresistor (Rn3) connect，The other end of the second inductance (L2) and the other end of the 3rd Zinc-oxide piezoresistor (Rn3) connect；First Zinc-oxide piezoresistor (Rn1), the second Zinc-oxide piezoresistor (Rn2) play the effect that lightning wave energy discharges over the ground, when the first Zinc-oxide piezoresistor (Rn1) has leakage current in the line, first Zinc-oxide piezoresistor (Rn1) generates heat, Thermal Cutoffs (Rt) disconnects automatically, and Thermal Cutoffs (Rt) plays anti-on fire, the effect of blast；First inductance (L1), the second inductance (L2) are decoupling component, it is possible to reduce the effect of the steepness of thunder and lightning；
Wherein, described power supply and voltage sampling module include transformator, first diode (D1), second diode (D2), 3rd diode (D3), 4th diode (D4), first filter capacitor (C1), second filter capacitor (C2), three terminal regulator, first resistance (R1), second resistance (R2), wherein: one end of transformer primary side is connected with the common port of the 3rd Zinc-oxide piezoresistor (Rn3) with the first inductance (L1) in lightning protection unit circuit by electric fuse, the other end and the second inductance (L2) are connected with the common port of the 3rd Zinc-oxide piezoresistor (Rn3)；One end of transformer secondary is connected with negative electrode, the anode of the second diode (D2) of the first diode (D1) respectively, and the other end is connected with negative electrode, the 4th diode (D4) anode of the 3rd diode (D3) respectively；The negative electrode of the second diode (D2) is connected with the negative electrode of the 4th diode (D4), one end of the first resistance (R1), the positive pole of the first filter capacitor (C1), the input of three terminal regulator respectively, and the other end of the first resistance (R1) and one end of the second resistance (R2) connect；The anode of the first diode (D1) is connected with the anode of the 3rd diode (D3), the other end of the second resistance (R2), the negative pole of the first filter capacitor (C1), the earth terminal of three terminal regulator, the negative pole of the second filter capacitor (C2) respectively；The outfan of three terminal regulator and the positive pole of the second filter capacitor (C2) connect；
First diode (D1), the second diode (D2), the 3rd diode (D3), the 4th diode (D4) constitute rectifier bridge；First resistance (R1), the second resistance (R2) constitute voltage sample circuit, and the upper voltage signal taken out of the second resistance (R2) is used for reacting the situation of change of line voltage；The output voltage at the second filter capacitor (C2) two ends is as the DC source of benchmark.
One the most according to claim 1 automatically resets thunder-proof type overvoltage/undervoltage protection device, it is characterized in that, described bound voltage comparison module includes the 3rd resistance (R3), 4th resistance (R4), 5th resistance (R5), 6th resistance (R6), first integrated operational amplifier (IC1), second integrated operational amplifier (IC2), 5th diode (D5), 6th diode (D6), wherein: one end of the 3rd resistance (R3) is connected with benchmark DC source, the other end respectively with the in-phase input end of the first integrated operational amplifier (IC1), one end of 4th resistance (R4) connects；One end of 5th resistance (R5) is connected with benchmark DC source, and the other end is connected with inverting input, one end of the 6th resistance (R6) of the second integrated operational amplifier (IC2) respectively；The other end of the 4th resistance (R4) and the other end of the 6th resistance (R6) ground connection respectively；The outfan of the first integrated operational amplifier (IC1) and the negative electrode of the 5th diode (D5) connect, and the outfan of the second integrated operational amplifier (IC2) and one end of the 6th diode (D6) connect；Upper voltage limit is inputted by the inverting input of the first integrated operational amplifier (IC1), lower voltage limit is inputted by the normal phase input end of the second integrated operational amplifier (IC2), as the output port of bound voltage comparison module after the anode of the 5th diode (D5) and the connection of the 6th diode (D6) anode；Upper voltage limit is inputted by the inverting input of the first integrated operational amplifier (IC1), and lower voltage limit is inputted by the normal phase input end of the second integrated operational amplifier (IC2).
One the most according to claim 2 automatically resets thunder-proof type overvoltage/undervoltage protection device, it is characterized in that, described under-voltage time delays recovery module of crossing includes the 7th resistance (R7), 8th resistance (R8), 9th resistance (R9), tenth resistance (R10), 3rd integrated operational amplifier (IC3), 4th integrated operational amplifier (IC4), 3rd electric capacity (C3), wherein: one end of the 7th resistance (R7) is connected with benchmark DC source, the other end respectively with one end of the 9th resistance (R9), the normal phase input end of the 3rd integrated operational amplifier (IC3), the inverting input of the 4th integrated operational amplifier (IC4), one end of tenth resistance (R10) connects；Recover the first output port of module, the other end ground connection of the tenth resistance (R10) as under-voltage time delays excessively after the other end of the 9th resistance (R9) and the outfan connection of the 3rd integrated operational amplifier (IC3)；One end of 8th resistance (R8) is connected with benchmark DC source, and the other end is connected with the inverting input of the 3rd integrated operational amplifier (IC3), the output port of bound voltage comparison module, the normal phase input end of the 4th integrated operational amplifier (IC4), one end of the 3rd electric capacity (C3) respectively；The other end ground connection of the 3rd electric capacity (C3), the outfan of the 4th integrated operational amplifier (IC4) recovers the second output port of module as crossing under-voltage time delays.
One the most according to claim 3 automatically resets thunder-proof type overvoltage/undervoltage protection device, it is characterized in that, described driving and state indicator module include the 11st resistance (R11), 12nd resistance (R12), 13rd resistance (R13), 14th resistance (R14), 15th resistance (R15), first audion (T1), second audion (T2), 3rd audion (T3), solid-state relay, 7th diode (D7), 8th diode (D8), wherein: the 11st resistance (R11) one end is connected with crossing the outfan of the 3rd integrated operational amplifier (IC3) in under-voltage time delays recovery module, the base stage of the other end and the first audion (T1) connects；One end of 12nd resistance (R12) is connected with crossing the outfan of the 4th integrated operational amplifier (IC4) in under-voltage time delays recovery module, and the base stage of the other end and the second audion (T2) connects；One end of 13rd resistance (R13) is connected with crossing the outfan of the 4th integrated operational amplifier (IC4) in under-voltage time delays recovery module, and the base stage of the other end and the 3rd audion (T3) connects；The colelctor electrode of the first audion (T1) is connected with one end of solid-state relay, the other end ground connection of solid-state relay；The colelctor electrode of the second audion (T2) is connected with the negative electrode of the 7th diode (D7) by the 14th resistance (R14), the plus earth of the 7th diode (D7)；The colelctor electrode of the 3rd audion (T3) is connected with the negative electrode of the 8th diode (D8) by the 15th resistance (R15), the plus earth of the 8th diode (D8)；First audion (T1), the second audion (T2), the equal ground connection of emitter stage of the 3rd audion (T3).
One the most according to claim 4 automatically resets thunder-proof type overvoltage/undervoltage protection device, it is characterised in that described cross under-voltage time delays to recover the delay time of module process to be 30s.
One the most according to claim 5 automatically resets thunder-proof type overvoltage/undervoltage protection device, it is characterised in that the upper voltage signal magnitude taken out of described second resistance (R2) is 7V.
One the most according to claim 6 automatically resets thunder-proof type overvoltage/undervoltage protection device, it is characterised in that the DC source of described benchmark is+12V.
One the most according to claim 7 automatically resets thunder-proof type overvoltage/undervoltage protection device, it is characterised in that described upper voltage limit is 8.5V, and lower voltage limit is 5.5V.
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| CN105186445A (en) * | 2015-08-20 | 2015-12-23 | 浙江凯发电气股份有限公司 | Novel self-recovery type overvoltage-undervoltage protector circuit |
| CN105048406A (en) * | 2015-08-20 | 2015-11-11 | 浙江凯发电气股份有限公司 | Self-recovery overvoltage and undervoltage protector circuit |
| CN106786458B (en) * | 2016-12-26 | 2019-01-22 | 北京航天测控技术有限公司 | A kind of fast reaction automatic protection circuit and method |
| CN109088392B (en) * | 2018-09-06 | 2024-04-05 | 深圳和而泰智能控制股份有限公司 | Protection circuit and electronic equipment |
| CN109888760B (en) * | 2019-03-12 | 2023-10-20 | 北京山图有源防雷科技有限公司 | Safety protection device for electrical equipment |
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Effective date of registration: 20170714 Address after: 211800 Jiangsu Province, Nanjing city Pu Road Zijin Technology Innovation special community building 5, 3 floor Patentee after: Nanjing Chuang Bo Electronics Co., Ltd. Address before: 210044 Nanjing City, Pukou Province, Nanjing Road, No. 219, No. six, No. Patentee before: Nanjing University of Information Science and Technology |