CN206117116U - Over -voltage and under -voltage protection circuit - Google Patents

Over -voltage and under -voltage protection circuit Download PDF

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Publication number
CN206117116U
CN206117116U CN201621037968.2U CN201621037968U CN206117116U CN 206117116 U CN206117116 U CN 206117116U CN 201621037968 U CN201621037968 U CN 201621037968U CN 206117116 U CN206117116 U CN 206117116U
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China
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module
resistance
voltage
under
audion
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Inventor
钟绪浪
朱宝华
王瑾
梁其能
高云峰
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Han s Laser Technology Industry Group Co Ltd
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Han s Laser Technology Industry Group Co Ltd
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Abstract

The utility model relates to an over -voltage and under -voltage protection circuit. Over -voltage and under -voltage protection circuit includes rectifier module, partial pressure sampling module, overvoltage protection module, under -voltage protection module, control module, switch module. Wherein, the overvoltage protection module is through judging, when a sample voltage of input is greater than reference voltage ( overpressure condition ), control module control switch module switches on, with the commercial power disconnection that the switch module is connected, no longer supplies power to the load to reach the effect of protection load. Under -voltage protection module is through judging, when the 2nd sample voltage of input is lighter than reference voltage ( undervoltage condition ), control module control switch module switches on, with the commercial power disconnection that the switch module is connected, no longer supplies power to the load to reach the effect of protection load. The effect of protection load just can be reached through the aforesaid control over -voltage and under -voltage protection circuit simple, small, with low costs.

Description

Over-and under-voltage protection circuit
Technical field
This utility model is related to power protecting circuit, more particularly to over-and under-voltage protection circuit.
Background technology
Laser welding is a kind of emerging welding procedure, high with welding energy density, and heated effluent field is little, and deformation is little, The characteristics of weld seam is exquisite.Laser welding technology has molten bath clean-up effect, the pure welding material of energy, to of the same race or different materials Welding is particularly advantageous, it is adaptable to identical and between different metal material, the welding of plastic or other material.May during laser welding Electrical network power supply signal can be subject to disturb and affect the stability of welding, if Laser Power Devices are over-pressed, laser instrument can be made to be subject to fatal damage It is bad;Meanwhile, the under-voltage input of electrical network, the stress that may result in Laser Power Devices module increases, and input power is increased, and accelerates to damage Power source life, so as to influence whether stablizing for laser instrument.
Traditional Laser Power Devices overvoltage/undervoltage protection is compared using overvoltage-undervoltage protector or using two operational amplifiers Overvoltage/undervoltage process is carried out etc. mode.But the high cost of above-mentioned overvoltage/undervoltage processing mode, element are more, volume is big, control more multiple It is miscellaneous.
Utility model content
Based on this, it is necessary to for the problems referred to above, there is provided one kind control is simple, small volume and low cost over-and under-voltage are protected Circuit.
A kind of over-and under-voltage protection circuit, including it is rectification filtering module, partial pressure sampling module, overvoltage protective module, under-voltage Protection module, control module, switch module;
The rectification filtering module is electrically connected with city, for exporting stable magnitude of voltage;
The partial pressure sampling module includes:The input that is connected with the outfan of the rectification filtering module, for exporting First outfan of the first sampled voltage and the second outfan for exporting the second sampled voltage;
First outfan, overvoltage protective module, control module, switch module are sequentially connected;
Second outfan, under-voltage protective module, control module, switch module are sequentially connected;Wherein,
The overvoltage protective module and under-voltage protective module be used to judging respectively the first sampled voltage, the second sampled voltage with The size of reference voltage;
The control module is used for when first sampled voltage is more than reference voltage, controls the switch module and leads It is logical, make electrically disconnected with the city that the switch module is connected;When second sampled voltage is less than reference voltage, the switch is controlled Module is turned on, and is made electrically disconnected with the city that the switch module is connected.
Wherein in one embodiment, the partial pressure sampling module includes first resistor, second resistance and 3rd resistor; One end of the first resistor is connected with the outfan of the rectification filtering module, the other end of the first resistor respectively with institute State second resistance, 3rd resistor connection;
The other end of the second resistance is connected with the input of the overvoltage protective module;
The other end of the 3rd resistor is connected with the input of the under-voltage protective module.
Wherein in one embodiment, the overvoltage protective module can including the 4th resistance, the 5th resistance and the one or three end Adjust shunt reference source;
5th resistance eutral grounding described in the 4th resistance Jing, the other end of the 4th resistance is electric with described second respectively Judge that the first input end of signal connects for receiving overvoltage protective module in resistance, control module;
The reference edge of the one or the three end adjustable shunt reference source connects with the junction point of the 4th resistance, the 5th resistance Connect;The negative electrode of the one or the three end adjustable shunt reference source is connected with the first input end of the control module, and the described 1st The plus earth of end adjustable shunt reference source.
Wherein in one embodiment, the overvoltage protective module can including the 6th resistance, the 7th resistance and the two or three end Adjust shunt reference source;
The first end of the 6th resistance is connected with the reference edge of the two or the three end adjustable shunt reference source;Described 6th Second end of resistance is connected respectively with the 3rd resistor, the 7th resistance;The other end ground connection of the 7th resistance;Described second Judge that signal second is input into for receiving under-voltage protective module in the negative electrode of three end adjustable shunt reference sources and the control module End connection;The plus earth of the two or the three end adjustable shunt reference source.
Wherein in one embodiment, the control module includes photoelectrical coupler, the 8th resistance and the 9th resistance;
8th resistance described in the anode Jing of the luminous source of the photoelectrical coupler respectively with the partial pressure sampling module, overvoltage Protection module connects, and the negative electrode of the luminous source of the photoelectrical coupler is connected with the under-voltage protective module;
9th resistance described in one end Jing of the light-receiving device of the photoelectrical coupler is connected with DC power supply;The photoelectricity The outfan of the light-receiving device of bonder is connected with the switch module.
Wherein in one embodiment, also including diverter module, the diverter module includes the first audion, the two or three pole Pipe;
The base stage of first audion is connected with the emitter stage of second audion, the transmitting of first audion Pole is connected with first input end respectively with the control module, partial pressure sampling module, overvoltage protective module;One or three pole The colelctor electrode of pipe is connected respectively with the base stage of the second diode, the outfan of under-voltage protective module;Second audion Colelctor electrode be connected with the input of the under-voltage protective module.
Wherein in one embodiment, the diverter module also includes the tenth resistance, the 11st resistance and the 12nd resistance;
Tenth resistance is serially connected between the base stage of first audion and emitter stage;The one of 11st resistance End is connected with the partial pressure sampling module, and the other end of the 11st resistance connects with the outfan of the under-voltage protective module Connect;12nd resistance is serially connected between the colelctor electrode of first audion and the outfan of the under-voltage protective module.
Wherein in one embodiment, the switch module includes the 3rd audion, relay and the 13rd resistance;
The base stage of the 3rd audion is connected with the outfan of the light-receiving device of the photoelectrical coupler, the three or three pole The grounded collector of pipe, the 13rd resistance, the electronic coil of relay and direct current described in the emitter stage Jing of the 3rd audion Power supply connects;
The normally closed switch of the relay is series between civil power and load, when the electronic coil of the relay obtains electric, The normally closed switch of the relay disconnects;The base stage of the audion is the input of the switch module, the relay Normally closed switch is the outfan of the switch module.
Wherein in one embodiment, the switch module also includes the 14th resistance, one end of the 14th resistance It is connected with the anode of the 3rd audion, the other end ground connection of the 14th resistance.
Wherein in one embodiment, the 3rd audion is PNP type triode.
In above-mentioned over-and under-voltage protection circuit, partial pressure sampling module includes defeated with what the outfan of rectification filtering module was connected Enter end, for exporting first outfan and the second outfan for the second sampled voltage of output of the first sampled voltage.Overvoltage Protection module and under-voltage protective module are used to judge the size of the first sampled voltage, the second sampled voltage and reference voltage respectively. Control module is used for when the first sampled voltage is more than reference voltage, the conducting of controlling switch module, makes what is be connected with switch module City is electrically disconnected;When second sampled voltage is less than reference voltage, the conducting of controlling switch module makes the civil power being connected with switch module break Open, no longer to load supplying, to reach the effect of protection load.By the way that above-mentioned control is simple, small volume, low cost overvoltage is owed Voltage protection circuit can just reach the effect of protection load.
Description of the drawings
Fig. 1 is the module map of over-and under-voltage protection circuit;
Fig. 2 is the circuit diagram that over-and under-voltage protects potential circuit.
Specific embodiment
For the ease of understanding this utility model, this utility model is more fully retouched below with reference to relevant drawings State.Preferred embodiment of the present utility model is given in accompanying drawing.But, this utility model can come in many different forms real It is existing, however it is not limited to embodiment described herein.On the contrary, the purpose for providing these embodiments is made to public affairs of the present utility model The understanding for opening content is more thorough comprehensive.
Unless otherwise defined, all of technology used herein and scientific terminology are led with technology of the present utility model is belonged to The implication that the technical staff in domain is generally understood that is identical.It is simply in term used in the description of the present utility model herein The purpose of description specific embodiment, it is not intended that limit this utility model.Term as used herein "and/or" includes one The arbitrary and all of combination of individual or multiple related Listed Items.
Module map for over-and under-voltage protection circuit as shown in Figure 1, including rectification filtering module 110, partial pressure sampling mould Block 120, overvoltage protective module 130, under-voltage protective module 140, control module 150, switch module 160.Rectification filtering module 110 Electrically connect with city, for exporting stable magnitude of voltage.Partial pressure sampling module 120 includes the outfan with rectification filtering module 110 The input of connection, for export the first sampled voltage the first outfan and for export the second sampled voltage to overvoltage guarantor Second outfan of shield module 130.First outfan of partial pressure sampling module 120 connects with the input of under-voltage protective module 140 Connect, the second outfan of partial pressure sampling module 120 is connected with the input of overvoltage protective module 130.Overvoltage protective module 130, The outfan of under-voltage protective module 140 is connected respectively with the input of control module 150;Overvoltage protective module 130 and under-voltage guarantor Shield module 140 is used to judge the size of the first sampled voltage, the second sampled voltage and reference voltage respectively.Control module 150 Outfan is connected with switch module 160, and control module 150 is used for the conducting and cut-off of controlling switch module 160, namely for The outfan of controlling switch module 160 and the connection status of civil power.In the present embodiment, the outfan of switch module 160 with swash Photoelectric source connects
Wherein, overvoltage protective module 130 is (over-pressed when the first sampled voltage of input is more than reference voltage by judging State), the controlling switch module 160 of control module 150 is turned on, electrically disconnected with the city that switch module 160 is connected, and no longer load is supplied Electricity, to reach the effect of protection load.When the first sampled voltage is less than reference voltage, switch module 160 is turned on, and civil power is negative Carry power supply.Under-voltage protective module 140 passes through to judge, when the second sampled voltage of input is less than reference voltage (under-voltage condition), The controlling switch module 160 of control module 150 is turned on, electrically disconnected with the city that switch module 160 is connected, no longer to load supplying, with Reach the effect of protection load.When the second sampled voltage is more than reference voltage, switch module 160 is turned on, and civil power is supplied for load Electricity.
Circuit diagram for over-and under-voltage protection circuit as shown in Figure 2, rectification filtering module 110 includes rectifier bridge D1 and filter Ripple electric capacity C1.During circuit start, then electric current is filtered through rectifier bridge D1 rectifications by filter capacitor C1, so as to obtain one Individual stable magnitude of voltage U0, export to partial pressure sampling module 120.
Partial pressure sampling module 120 includes first resistor R1, second resistance R2,3rd resistor R3.One end of first resistor R1 It is connected with the outfan of rectification filtering module 110, the other end of first resistor R1 connects respectively with second resistance R2,3rd resistor R3 Connect.The other end (as the first outfan of partial pressure sampling module 120) of second resistance R2 and the input of overvoltage protective module 130 End connection;The other end (as the second outfan of partial pressure sampling module 120) of 3rd resistor R3 and under-voltage protective module 140 Input connects.
Overvoltage protective module 130 includes the 4th resistance R4, the 5th resistance R5 and the one or three end adjustable shunt reference source U1.The The resistance R5 of four resistance R4 Jing the 5th are grounded, the other end of the 4th resistance R4 respectively with second resistance R2, control module 150 first Input connects.The reference edge and the 4th resistance R4 of the one or three end adjustable shunt reference source U1, the junction point of the 5th resistance R5 connect Connect;The negative electrode of the one or three end adjustable shunt reference source U1 is connected with the first input end of control module 150, the one or three adjustable point of end The plus earth of stream a reference source U1.
Overvoltage protective module 130 includes the 6th resistance R6, the 7th resistance R7 and the two or three end adjustable shunt reference source U2.The The first end of six resistance R6 is connected with the reference edge of the two or three end adjustable shunt reference source U1;The second end difference of the 6th resistance R6 It is connected with 3rd resistor R3, the 7th resistance R7;The other end ground connection of the 7th resistance R7.Two or three end adjustable shunt reference source U2's Negative electrode is connected with the second input of control module 150;The plus earth of the two or three end adjustable shunt reference source U2.In this enforcement In, the 7th resistance R7 is adjustable resistance, can adjust the magnitude of voltage at the 7th resistance two ends.
Control module 150 includes photoelectrical coupler U3, the 8th resistance R8 and the 9th resistance R9.Wherein, photoelectrical coupler U3 It is a kind of electrical-optical-electrical switching device with light as the media transmission signal of telecommunication.It is made up of luminous source and light-receiving device two parts. Luminous source and light-receiving device are assembled in same closed housing, are isolated with transparent insulator to each other.In this embodiment, light thermocouple The luminous source of clutch U3 is that the light-receiving device of photoelectrical coupler U3 is phototriode.The resistance of anode Jing the 8th of light emitting diode R8 is connected respectively with the negative electrode of second resistance R2, the one or three end adjustable shunt reference source U1.The negative electrode of light emitting diode and second The negative electrode connection of three end adjustable shunt reference source U2;One end (colelctor electrode of phototriode) of the light-receiving device of photoelectrical coupler U3 The resistance R9 of Jing the 9th are connected with DC power supply VCC;The light-receiving device of photoelectrical coupler U3 outfan (phototriode send out Emitter-base bandgap grading) it is connected with the input of switch module 160.In the present embodiment, DC power supply VCC is 12 volts of DC source.
Over-and under-voltage protection circuit also includes diverter module 170, and diverter module 170 includes the one or three pipe Q1, the two or three pole Pipe Q2 poles, the tenth resistance R10, the 11st resistance R11 and the 12nd resistance R12.In the present embodiment, the one or three pipe Q1, second Audion Q2 poles are PNP type triode.The base stage of the first audion Q1 is connected with the emitter stage of the second audion Q2, and the one or three The emitter stage of pole pipe Q1 is connected with the 8th resistance R8, second resistance R2, the 4th resistance R4 with respectively.Tenth resistance R10 is serially connected in Between the base stage and emitter stage of the first audion Q1.The base stage of the colelctor electrode of the first audion Q1 and the second diode Q2, also Jing 12nd resistance R12 negative electrodes respectively with the light emitting diode of photoelectrical coupler U3, the two or three end adjustable shunt reference source U2 Negative electrode connects;The colelctor electrode of the second audion Q2 is connected respectively with the 6th resistance, the 7th resistance.One end of 11st resistance R11 It is connected with second resistance R2, the other end of the 11st resistance R11 negative electrode respectively with the two or three end adjustable shunt reference source U2, 12 resistance R12 connect.Diverter module 170 can be used for sharing the part electricity of photoelectrical coupler U3 in underexcitation Stream, plays a part of overcurrent protection.
Switch module 160 includes the 3rd audion Q3, relay K1 and the 14th resistance R14.Wherein, the 3rd audion Q3 For PNP type triode.The outfan of the base stage of the 3rd audion Q3 and the light-receiving device of photoelectrical coupler U3 (send out by phototriode Emitter-base bandgap grading) connection, the grounded collector of the 3rd audion Q3.The resistance R13 of emitter stage Jing the 13rd of the 3rd audion Q3, relay The electronic coil of K1 is connected with DC power supply VCC.The normally closed switch of relay K1 is series between civil power and load, relay When the electronic coil of device K1 obtains electric, the normally closed switch of relay K1 disconnects;The base stage of audion Q3 is the input of switch module 160 End, the normally closed switch of relay K1 is the outfan of switch module 160.Wherein, the 14th resistance R14 be clamp resistance, the tenth One end of four resistance R14 is connected with the anode of the 3rd audion Q3, the other end ground connection of the 14th resistance R14.Work as photoelectric coupling When device U3 occurs abnormal, its clamp resistance R14 has protective effect to the 3rd audion Q3.
Wherein, the reference voltage of the reference edge of the one or three end adjustable shunt reference source U1 is 2.5 volts, its partial pressure sampling module First resistor R1, second resistance R2 in 120 is sampled to the voltage Uo after rectifying and wave-filtering, and exports the first sampled voltage, And judge the size of the first sampled voltage and reference voltage, if the first sampled voltage is less than 2.5V, the one or three end adjustable shunt The anode-cathode of a reference source U1 is not turned on, its photoelectrical coupler U3 normallies, and then the 3rd audion Q3 of control is not turned on, Relay K1 does not work, and keeps the input of mains supply;If the first sampled voltage is more than 2.5V, the one or three end adjustable shunt base The anode-cathode conducting of quasi- source U1 so that photoelectrical coupler U3 can not be turned on, so as to control the 3rd audion Q3 conductings, with the The electronic coil of the emitter stage connection relay K1 of three audion Q3 obtains electric, and the normally closed switch of relay K1 disconnects, i.e., civil power with What is loaded is separated, and then the power input safety of laser instrument is needed after ensureing.
First resistor R1,3rd resistor R3 in partial pressure sampling module 120 is sampled to the voltage Uo after rectifying and wave-filtering, And export the second sampled voltage, and judge the size of the second sampled voltage and reference voltage, if the first sampled voltage is less than 2.5V, Then the anode-cathode of the one or three end adjustable shunt reference source U1 is not turned on, then the primary side of photoelectrical coupler U3 is not turned on, and then The 3rd audion Q3 conductings are controlled, the electronic coil for being connected relay K1 with the emitter stage of the 3rd audion Q3 obtains electric, relay The normally closed switch of K1 disconnects, i.e.,.If the second sampled voltage is more than 2.5V, the conducting of photoelectrical coupler U3 primary sides, and then controls 3rd audion Q3 is not turned on, and K1 does not work, and keeps the input of mains supply.
Thus, when mains-supplied circuit occurs over-pressed or under-voltage, overvoltage protective module 130 and under-voltage protective module 140 Correspondence makes the action of the conducting of controlling switch module 160, and civil power is separated with load, and then needs laser power supply defeated after ensureing Enter safety.
When first sampled voltage of the input of overvoltage protective module 130 of above-mentioned over-and under-voltage protection circuit is more than reference voltage When (overvoltage condition), the controlling switch module 160 of control module 150 is turned on, electrically disconnected with the city that switch module 160 is connected, no longer To load supplying, to reach the effect of protection load.When the first sampled voltage is less than reference voltage, switch module 160 is turned on, Civil power is load (Laser Power Devices) power supply.Second sampled voltage of the input of under-voltage protective module 140 is less than (under-voltage during reference voltage State), the controlling switch module 160 of control module 150 is turned on, electrically disconnected with the city that switch module 160 is connected, and no longer load is supplied Electricity, to reach the effect of protection load.When the second sampled voltage is more than reference voltage, switch module 160 is turned on, and civil power is negative Carry (Laser Power Devices) power supply.So as to realize when there are the abnormal phenomenas such as over-and under-voltage to the protection of Laser Power Devices, it is to avoid laser Power supply is damaged.
The over-and under-voltage protection circuit control is simple, and small volume, low cost and other advantages protect the prime of laser power supply Power input, so as to protect the safety of laser instrument, so as to improve the reliability of Laser Power Devices.
Each technical characteristic of embodiment described above can be combined arbitrarily, to make description succinct, not to above-mentioned reality Apply all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited In contradiction, the scope of this specification record is all considered to be.
Embodiment described above only expresses several embodiments of the present utility model, and its description is more concrete and detailed, But therefore can not be interpreted as the restriction to utility model patent scope.It should be pointed out that for the common skill of this area For art personnel, without departing from the concept of the premise utility, some deformations and improvement can also be made, these are belonged to Protection domain of the present utility model.Therefore, the protection domain of this utility model patent should be defined by claims.

Claims (10)

1. a kind of over-and under-voltage protection circuit, it is characterised in that including rectification filtering module, partial pressure sampling module, overvoltage protection Module, under-voltage protective module, control module, switch module;
The rectification filtering module is electrically connected with city, for exporting stable magnitude of voltage;
The partial pressure sampling module includes:The input that is connected with the outfan of the rectification filtering module, for output first First outfan of sampled voltage and the second outfan for exporting the second sampled voltage;
First outfan, overvoltage protective module, control module, switch module are sequentially connected;
Second outfan, under-voltage protective module, control module, switch module are sequentially connected;Wherein,
The overvoltage protective module and under-voltage protective module are respectively used to judge the first sampled voltage, the second sampled voltage and benchmark The size of voltage;
The control module is used for when first sampled voltage is more than reference voltage, controls the switch module conducting, makes It is electrically disconnected with the city that the switch module is connected;When second sampled voltage is less than reference voltage, the switch module is controlled Conducting, makes electrically disconnected with the city that the switch module is connected.
2. over-and under-voltage protection circuit according to claim 1, it is characterised in that the partial pressure sampling module includes first Resistance, second resistance and 3rd resistor;One end of the first resistor is connected with the outfan of the rectification filtering module, institute The other end for stating first resistor is connected respectively with the second resistance, 3rd resistor;
The other end of the second resistance is connected with the input of the overvoltage protective module;
The other end of the 3rd resistor is connected with the input of the under-voltage protective module.
3. over-and under-voltage protection circuit according to claim 2, it is characterised in that the overvoltage protective module includes the 4th Resistance, the 5th resistance and the one or three end adjustable shunt reference source;
5th resistance eutral grounding described in the 4th resistance Jing, the other end of the 4th resistance respectively with the second resistance, control It is used to receive the first input end connection that overvoltage protective module judges signal in molding block;
The reference edge of the one or the three end adjustable shunt reference source is connected with the junction point of the 4th resistance, the 5th resistance;Institute The negative electrode for stating the one or three end adjustable shunt reference source is connected with the first input end of the control module, and the one or three end is adjustable The plus earth of shunt reference source.
4. over-and under-voltage protection circuit according to claim 2, it is characterised in that the overvoltage protective module includes the 6th Resistance, the 7th resistance and the two or three end adjustable shunt reference source;
The first end of the 6th resistance is connected with the reference edge of the two or the three end adjustable shunt reference source;6th resistance The second end be connected with the 3rd resistor, the 7th resistance respectively;The other end ground connection of the 7th resistance;Two or three end It is used to receive the second input that under-voltage protective module judges signal in the negative electrode of adjustable shunt reference source and the control module Connection;The plus earth of the two or the three end adjustable shunt reference source.
5. over-and under-voltage protection circuit according to claim 1, it is characterised in that the control module includes photoelectric coupling Device, the 8th resistance and the 9th resistance;
8th resistance described in the anode Jing of the luminous source of the photoelectrical coupler respectively with the partial pressure sampling module, overvoltage protection Module connects, and the negative electrode of the luminous source of the photoelectrical coupler is connected with the under-voltage protective module;
9th resistance described in one end Jing of the light-receiving device of the photoelectrical coupler is connected with DC power supply;The photoelectric coupling The outfan of the light-receiving device of device is connected with the switch module.
6. over-and under-voltage protection circuit according to claim 3, it is characterised in that also including diverter module, the shunting Module includes the first audion, the second audion;
The base stage of first audion is connected with the emitter stage of second audion, the emitter stage of first audion with First input end respectively with the control module, partial pressure sampling module, overvoltage protective module are connected;First audion Colelctor electrode is connected respectively with the base stage of the second audion, the outfan of under-voltage protective module;The collection of second audion Electrode is connected with the input of the under-voltage protective module.
7. over-and under-voltage protection circuit according to claim 6, it is characterised in that the diverter module also includes that the tenth is electric Resistance, the 11st resistance and the 12nd resistance;
Tenth resistance is serially connected between the base stage of first audion and emitter stage;One end of 11st resistance with The partial pressure sampling module connection, the other end of the 11st resistance is connected with the outfan of the under-voltage protective module;Institute State the 12nd resistance to be serially connected between the colelctor electrode of first audion and the outfan of the under-voltage protective module.
8. over-and under-voltage protection circuit according to claim 5, it is characterised in that the switch module includes the three or three pole Pipe, relay and the 13rd resistance;
The base stage of the 3rd audion is connected with the outfan of the light-receiving device of the photoelectrical coupler, the 3rd audion Grounded collector, the 13rd resistance, the electronic coil of relay and direct current supply described in the emitter stage Jing of the 3rd audion Power supply connects;
The normally closed switch of the relay is series between civil power and load, described when the electronic coil of the relay obtains electric The normally closed switch of relay disconnects;The base stage of the audion is the input of the switch module, the relay it is normally closed Switch as the outfan of the switch module.
9. over-and under-voltage protection circuit according to claim 8, it is characterised in that the switch module also includes the 14th Resistance, one end of the 14th resistance is connected with the anode of the 3rd audion, another termination of the 14th resistance Ground.
10. over-and under-voltage protection circuit according to claim 8, it is characterised in that the 3rd audion is positive-negative-positive three Pole pipe.
CN201621037968.2U 2016-09-05 2016-09-05 Over -voltage and under -voltage protection circuit Active CN206117116U (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
CN201621037968.2U CN206117116U (en) 2016-09-05 2016-09-05 Over -voltage and under -voltage protection circuit

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107069655A (en) * 2017-06-06 2017-08-18 吉林省中赢高科技有限公司 A kind of voltage protection circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107069655A (en) * 2017-06-06 2017-08-18 吉林省中赢高科技有限公司 A kind of voltage protection circuit
CN107069655B (en) * 2017-06-06 2020-11-27 吉林省中赢高科技有限公司 Voltage protection circuit

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