CN104717774B - A kind of overvoltage crowbar and and lighting apparatus of lamps and lanterns - Google Patents
A kind of overvoltage crowbar and and lighting apparatus of lamps and lanterns Download PDFInfo
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- CN104717774B CN104717774B CN201310690718.3A CN201310690718A CN104717774B CN 104717774 B CN104717774 B CN 104717774B CN 201310690718 A CN201310690718 A CN 201310690718A CN 104717774 B CN104717774 B CN 104717774B
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- overvoltage crowbar
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Abstract
The invention discloses a kind of overvoltage crowbars of lamps and lanterns; the negative input end of the anode connection overvoltage crowbar in adjustable reference source; the cathode in adjustable reference source connects the positive input terminal of overvoltage crowbar by 3rd resistor, and the reference pole in adjustable reference source connects the cathode of itself；The cathode in the negative input end connection adjustable reference source of amplifier, second resistance are connected across between the positive input terminal of amplifier and output end；The positive input terminal of one end connection overvoltage crowbar of first resistor; the positive input terminal of the other end connection amplifier of first resistor and one end of the 4th resistance, the other end of the 4th resistance are separately connected the anode in adjustable reference source, the negative output terminal of overvoltage crowbar and ground connection.The invention also discloses a kind of lighting apparatus.Using the present invention, it is avoided that lamps and lanterns over-voltage is burned.
Description
Technical field
The present invention relates to circuit field more particularly to the overvoltage crowbars and and lighting apparatus of a kind of lamps and lanterns.
Background technique
It is now much portable to make lamps and lanterns or battery power supply lamps and lanterns that adapter all be used to power or charge.It is all on the market
The unified standard DC interface that adapter all uses, this there is a hidden danger, if there is multiple a adapters in use process,
When is that either with or without by their wrong plugs? answer is affirmative, and owner can make this mistake, can make lamps and lanterns driving electricity
Road or cell damage are it is necessary to see the protection circuit of driving plate and by the anti-overvoltage capabilities of the electric battery core of punching.
The mixed phenomenon of adapter is likely to occur in actual use.Voltage needed for different lamps and lanterns is different, if adapter
It is mixed, the product failures such as lamps and lanterns may be made, or even the serious accidents such as cells burst explosion occur.It is past in some enterprises and institutions
Toward the lamps and lanterns product or chargeable product using many different manufacturers, if adapter is mixed, a possibility that accident occurs, is significantly
It improves, influencing will be more serious.
Summary of the invention
The technical problem to be solved by the embodiment of the invention is that providing overvoltage crowbar and and the illumination of a kind of lamps and lanterns
Equipment.It can prevent the mixed deficiency for causing lamps and lanterns to burn of the adapter of lamps and lanterns.
In order to solve the above-mentioned technical problems, the present invention provides a kind of overvoltage crowbars of lamps and lanterns, comprising:
First resistor, second resistance, 3rd resistor, the 4th resistance, the 5th resistance, adjustable reference source, operational amplifier and
Field-effect tube, wherein the anode in the adjustable reference source connects the negative input end of the overvoltage crowbar, the adjustable reference
The cathode in source connects the positive input terminal of the overvoltage crowbar, the reference pole in the adjustable reference source by the 3rd resistor
Connect the cathode of itself；
The negative input end of the operational amplifier connects the cathode in the adjustable reference source, and the second resistance is connected across institute
It states between the positive input terminal of operational amplifier and output end；
One end of the first resistor connects the positive input terminal of the overvoltage crowbar, the other end of the first resistor
The positive input terminal of the operational amplifier and one end of the 4th resistance are connected, the other end of the 4th resistance is separately connected
The anode in the adjustable reference source, the negative output terminal of the overvoltage crowbar and ground connection；
The grid of the field-effect tube connects the output end of the operational amplifier, and the source electrode of the field-effect tube connects institute
The positive output end of overvoltage crowbar is stated, the drain electrode of the field-effect tube connects the positive input terminal of the overvoltage crowbar；
5th resistance is connected across between the drain electrode and grid of the field-effect tube.
It wherein, further include diode, the anode of the diode connects the positive input terminal of the overvoltage crowbar, described
The cathode of diode connects the cathode in the adjustable reference source by the 3rd resistor.
Wherein, the reference voltage in the adjustable reference source is 2.5V.
Wherein, the threshold value electricity of the overvoltage crowbar is determined according to the resistance value of the first resistor and the 4th resistance
Pressure.
Wherein, the component in the overvoltage crowbar is surface mount elements, and the surface of component and circuit board is equal
It is covered with three-proofing coating.
Wherein, the field-effect tube is P-channel field-effect transistor (PEFT) pipe.
Correspondingly, the present invention also provides a kind of lighting apparatus, including above-mentioned overvoltage crowbar and light source load, institute
State the output end that light source load is connected to the overvoltage crowbar.
It wherein, further include a power outlet, one end of the power outlet connects the just defeated of the overvoltage crowbar
Enter end, the other end of the power outlet connects the negative input end of the overvoltage crowbar.
Wherein, the light source load is LED load, further includes LED driver, the input terminal connection of the LED driver
The output end of the output end of the overvoltage crowbar, the LED driver connects the LED load.
The invention has the following beneficial effects:
Whether overvoltage crowbar is more than threshold value electricity by the voltage value that the comparator that operational amplifier forms compares input
Pressure makes field-effect tube shutdown output, if it is, operational amplifier exports low level to protect the light source load in late-class circuit
It is not burned, improves the reliability of lamps and lanterns.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is a kind of circuit diagram of the overvoltage crowbar of lamps and lanterns；
Fig. 2 is a kind of circuit diagram of lighting apparatus.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
It is a kind of circuit diagram of the overvoltage crowbar of lamps and lanterns of the embodiment of the present invention referring to Fig. 1, in the present embodiment,
The overvoltage crowbar include first resistor R1, second resistance R2,3rd resistor R3, the 4th resistance R4, the 5th resistance R5, can
Adjust a reference source ZD1, operational amplifier U1 and field-effect tube Q1.
The connection relationship of above-mentioned component are as follows: the negative input end of the anode connection overvoltage crowbar of adjustable reference source ZD1,
The cathode of adjustable reference source ZD1 passes through the positive input terminal of 3rd resistor R3 connection overvoltage crowbar, the ginseng of adjustable reference source ZD1
Examine the cathode that pole connects itself；
The cathode of the negative input end connection adjustable reference source ZD1 of operational amplifier U1, second resistance R2 are connected across operation and put
Between the positive input terminal and output end of big device U1；
The positive input terminal of one end connection overvoltage crowbar of first resistor R1, the other end of first resistor R1 connect operation
One end of the positive input terminal of amplifier U1 and the 4th resistance R4, the other end of the 4th resistance R4 are separately connected adjustable reference source ZD1
Anode, overvoltage crowbar negative output terminal and ground connection；
The output end of the grid connection operational amplifier U1 of field-effect tube Q1, the source electrode of field-effect tube Q1 connect overvoltage protection
The positive output end of circuit, the positive input terminal of the drain electrode connection overvoltage crowbar of field-effect tube Q1；
5th resistance R5 is connected across between the drain electrode and grid of field-effect tube Q1.
Optionally, overvoltage crowbar further includes diode D1, and the anode connection overvoltage crowbar of diode D1 is just
Input terminal, the cathode of diode D1 pass through the cathode of 3rd resistor R3 connection adjustable reference source ZD1.
Optionally, the reference voltage of adjustable reference source ZD1 is 2.5V.For example, the model TL341 in adjustable reference source, interior
Portion can provide the reference voltage of 2.5V.
Optionally, the threshold voltage of overvoltage crowbar, mistake are determined according to the resistance value of first resistor R1 and the 4th resistance R4
Threshold voltage V=2.5*(R1+R4 of voltage protection circuit)/R1, if the voltage value that the input terminal of overvoltage crowbar inputs is more than threshold
Threshold voltage, then the output end Non voltage output of the overvoltage crowbar, protects the overtension of late-class circuit load, if over-voltage is protected
The voltage value of the input terminal input of protection circuit is no more than threshold voltage, then it is defeated normally to export its for the output point of the overvoltage crowbar
Enter the voltage value at end.
Optionally, the component in overvoltage crowbar is surface mount elements, and the surface of component and circuit board is covered
It is stamped three-proofing coating.It can guarantee that circuit works normally in dust, humidity and the environment of vibration, reliability be provided.Simultaneously using patch
Piece element has using automated production is realized, improves production efficiency.
Optionally, field-effect tube Q1 is P-channel field-effect transistor (PEFT) pipe.
The working principle of overvoltage crowbar are as follows: operation amplifier is adjusted according to the resistance value of first resistor R1 and the 4th resistance R4
The voltage of the positive input terminal of device U1, the voltage are the threshold voltage of overvoltage crowbar, and the voltage of input terminal input is less than the threshold
The voltage that threshold voltage can use input directly charges to lamps and lanterns, and operational amplifier U1 and second resistance R2 constitute hysteresis ratio
Compared with device, the phenomenon that comparison circuit the operation is stable, the output voltage stabilization of operational amplifier is not in shake.3rd resistor R3
2.5V threshold voltage generative circuit is formed with adjustable reference source ZD1.When the voltage of input terminal input is greater than threshold voltage, operation is put
The output switching activity of big device U1, field-effect tube Q1 cut-off turn off output loop, play the protection or so to light source load.
It referring to fig. 2, is a kind of circuit diagram of lighting apparatus of the embodiment of the present invention, lighting apparatus includes overvoltage crowbar
And light source load, light source load are connected to the output end of overvoltage crowbar.
Optionally, lighting apparatus further includes a power outlet J1, and one end of power outlet J1 connects overvoltage crowbar
Positive input terminal, the other end of power outlet J1 connects the negative input end of the overvoltage crowbar.
The light source load is LED load, further includes LED driver, the input terminal connection overvoltage protection electricity of LED driver
The output end of the output end on road, LED driver connects LED load.
If the voltage value that the input terminal of overvoltage crowbar inputs is more than threshold voltage, the output of the overvoltage crowbar
Non voltage output is held, the overtension of the LED load of late-class circuit is prevented, if the voltage that the input terminal of overvoltage crowbar inputs
Value is no more than threshold voltage, then the output point of the overvoltage crowbar normally exports the voltage value of its input terminal, and LED load is normal
Work.
Those of ordinary skill in the art will appreciate that realizing all or part of the process in above-described embodiment method, being can be with
Relevant hardware is instructed to complete by computer program, the program can be stored in a computer-readable storage medium
In, the program is when being executed, it may include such as the process of the embodiment of above-mentioned each method.Wherein, the storage medium can be magnetic
Dish, CD, read-only memory (Read-Only Memory, ROM) or random access memory (Random Access
Memory, RAM) etc..
Above disclosed is only a preferred embodiment of the present invention, cannot limit the power of the present invention with this certainly
Sharp range, those skilled in the art can understand all or part of the processes for realizing the above embodiment, and weighs according to the present invention
Benefit requires made equivalent variations, still belongs to the scope covered by the invention.
Claims (6)
1. a kind of overvoltage crowbar of lamps and lanterns characterized by comprising
First resistor, second resistance, 3rd resistor, the 4th resistance, the 5th resistance, adjustable reference source, operational amplifier and field effect
Ying Guan, wherein the anode in the adjustable reference source connects the negative input end of the overvoltage crowbar, the adjustable reference source
Cathode connects the positive input terminal of the overvoltage crowbar, the reference pole connection in the adjustable reference source by the 3rd resistor
The cathode of itself；The overvoltage crowbar further includes diode, and the anode of the diode connects the overvoltage crowbar
Positive input terminal, the cathode of the diode connects the cathode in the adjustable reference source by the 3rd resistor；It is described adjustable
The reference voltage of a reference source is 2.5V, and the threshold voltage of the overvoltage crowbar is 2.5* (resistance value+institute of the first resistor
State the resistance value of the 4th resistance) the resistance value of/first resistor；
The negative input end of the operational amplifier connects the cathode in the adjustable reference source, and the second resistance is connected across the fortune
Between the positive input terminal and output end for calculating amplifier；
One end of the first resistor connects the positive input terminal of the overvoltage crowbar, the other end connection of the first resistor
One end of the positive input terminal of the operational amplifier and the 4th resistance, the other end of the 4th resistance are separately connected described
The anode in adjustable reference source, the negative output terminal of the overvoltage crowbar and ground connection；
The grid of the field-effect tube connects the output end of the operational amplifier, and the source electrode of the field-effect tube connects the mistake
The positive output end of voltage protection circuit, the drain electrode of the field-effect tube connect the positive input terminal of the overvoltage crowbar；
5th resistance is connected across between the drain electrode and grid of the field-effect tube.
2. circuit as described in claim 1, which is characterized in that the component in the overvoltage crowbar is patch member
Part, and the surface of component and circuit board is all covered with three-proofing coating.
3. circuit as claimed in claim 1 or 2, which is characterized in that the field-effect tube is P-channel field-effect transistor (PEFT) pipe.
4. a kind of lighting apparatus, which is characterized in that including overvoltage crowbar as claimed in any one of claims 1-3 and light
Source load, the light source load are connected to the output end of the overvoltage crowbar.
5. lighting apparatus as claimed in claim 4, which is characterized in that it further include a power outlet, the power outlet
One end connects the positive input terminal of the overvoltage crowbar, and the other end of the power outlet connects the overvoltage crowbar
Negative input end.
6. the lighting apparatus stated such as claim 4, which is characterized in that the light source load is LED load, further includes LED driving
Device, the input terminal of the LED driver connect the output end of the overvoltage crowbar, and the output end of the LED driver connects
Connect the LED load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310690718.3A CN104717774B (en) | 2013-12-16 | 2013-12-16 | A kind of overvoltage crowbar and and lighting apparatus of lamps and lanterns |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310690718.3A CN104717774B (en) | 2013-12-16 | 2013-12-16 | A kind of overvoltage crowbar and and lighting apparatus of lamps and lanterns |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104717774A CN104717774A (en) | 2015-06-17 |
| CN104717774B true CN104717774B (en) | 2019-02-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310690718.3A Active CN104717774B (en) | 2013-12-16 | 2013-12-16 | A kind of overvoltage crowbar and and lighting apparatus of lamps and lanterns |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110298989A (en) * | 2019-05-14 | 2019-10-01 | 北京戴纳实验科技有限公司 | A kind of laboratory safety device |
| CN110480610A (en) * | 2019-08-23 | 2019-11-22 | 北京戴纳实验科技有限公司 | A kind of laboratory four axis robots of auxiliary of full coverage type |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201256282Y (en) * | 2008-08-01 | 2009-06-10 | 研祥智能科技股份有限公司 | High stability output overvoltage protection circuit |
| CN201282585Y (en) * | 2008-10-24 | 2009-07-29 | 常州星宇车灯股份有限公司 | Driver of automobile LED head light |
| CN102738781B (en) * | 2011-04-07 | 2016-08-24 | 炬才微电子（深圳）有限公司 | A kind of overvoltage crowbar, IC chip and over-voltage protection method |
| CN102740538B (en) * | 2011-04-13 | 2015-03-11 | 海洋王照明科技股份有限公司 | Led drive circuit |
| KR101146021B1 (en) * | 2011-07-27 | 2012-05-15 | (주)선일일렉콤 | Fluorescent lamp device having overvoltage protection circuit and overvoltage display unit |
| CN202797874U (en) * | 2012-07-03 | 2013-03-13 | 青岛海信移动通信技术股份有限公司 | Over-voltage protection circuit and mobile terminal |
| CN203223837U (en) * | 2013-05-15 | 2013-10-02 | 宁波市富来电子科技有限公司 | Automatic light modulator of automobile headlamp |
| CN103281834B (en) * | 2013-06-06 | 2015-04-01 | 东莞博用电子科技有限公司 | Overvoltage protection circuit applied to alternative current LED drive system |
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2013
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