CN104218520B - Isolated overvoltage crowbar and light fixture - Google Patents
Isolated overvoltage crowbar and light fixture Download PDFInfo
- Publication number
- CN104218520B CN104218520B CN201310210245.2A CN201310210245A CN104218520B CN 104218520 B CN104218520 B CN 104218520B CN 201310210245 A CN201310210245 A CN 201310210245A CN 104218520 B CN104218520 B CN 104218520B
- Authority
- CN
- China
- Prior art keywords
- input
- unit
- outfan
- resistance
- voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Abstract
The present invention proposes a kind of isolated overvoltage crowbar, and which includes：Feedback unit, which is used to detect whether the voltage in circuit exceedes setting value；Comparing unit, the first input end of comparing unit connect the outfan of feedback unit, the second input connection second source of comparing unit；Trip control unit, for control circuit and the break-make for loading, the first input end of trip control unit connects the first power supply, the second input connection second source of trip control unit, 3rd input of trip control unit connects the outfan of comparing unit, first outfan of trip control unit connects the first input end of comparing unit, the second outfan connection load of open circuit control end unit；Wherein, when feedback unit detects the voltage of circuit more than magnitude of voltage, the connection of comparing unit control trip control unit disconnecting circuit and load.The present invention also proposes a kind of light fixture.The present invention can carry out overvoltage protection, also ensure the personal safety of user.
Description
Technical field
The present invention relates to a kind of protection circuit, more particularly to a kind of isolated overvoltage crowbar and light fixture.
Background technology
Overvoltage protection is a vital part in power circuit, if no overvoltage protection, circuit and load are all
The infringement for bringing of overvoltage may be faced.And some overvoltage crowbars do not have and isolated from power, so may entail dangers to user
Safety.
The content of the invention
The technical problem to be solved in the present invention is to overcome the shortcomings of that above-mentioned prior art is present, and is proposed a kind of isolated
Overvoltage crowbar and light fixture, can carry out overvoltage protection, and ensure the personal safety of user.
To solve above-mentioned technical problem, the present invention proposes a kind of isolated overvoltage crowbar, and which includes：Feedback unit,
Which is used to detect whether the voltage in circuit exceedes setting value which to include input and outfan, the input of feedback unit
Connect the first power supply；Comparing unit, which includes first input end, the second input and outfan, and the first of comparing unit is defeated
Enter the outfan of end connection feedback unit, the second input connection second source of comparing unit；Trip control unit, which is controlled
In comparing unit, for the break-make of control circuit and load, it include first input end, the second input, the 3rd input, the
One outfan and the second outfan, the first input end of trip control unit connect the first power supply, and the of trip control unit
Two inputs connect second source, and the 3rd input of trip control unit connects the outfan of comparing unit, and open circuit control is single
First outfan of unit connects the first input end of comparing unit, the second outfan connection load of open circuit control end unit；Its
In, when feedback unit detects the voltage of circuit more than magnitude of voltage, comparing unit controls trip control unit disconnecting circuit and bears
The connection of load.
Preferably, feedback unit includes first resistor, second resistance, 3rd resistor, the 4th resistance, photo-coupler and electricity
Pressure a reference source, first resistor and second resistance are connected in parallel between the input of feedback unit and ground, the reference pole of voltage-reference
The junction of connection first resistor and second resistance, 3rd resistor are connected to the input of feedback unit and the moon of voltage-reference
Between pole, the plus earth of voltage-reference, the 4th resistance are connected to the anode of the input and photo-coupler of feedback unit
Between, the negative electrode of photo-coupler connects the negative electrode of voltage-reference, and the colelctor electrode of photo-coupler connects the outfan of feedback unit,
The grounded emitter of photo-coupler.
Preferably, comparing unit includes the 5th resistance, the 6th resistance, referrer module and operational amplifier, operation amplifier
The in-phase end connection referrer module of device, the end of oppisite phase of operational amplifier connect the first input end of comparing unit, and the 5th resistance connects
It is connected between the first input end and ground of comparing unit, the second input of the power end connection comparing unit of operational amplifier
End, the outfan of operational amplifier connect the outfan of comparing unit.
Preferably, trip control unit includes diode, switching tube, the 7th resistance and relay, and switching tube includes control
End processed, input and outfan, relay include hot-wire coil and are controlled by the switch of hot-wire coil, and switch is connected to disconnected
Between the first input end of road control unit and the second outfan, the second of the input connection trip control unit of switching tube
Input, the 7th resistance are connected between the input of switching tube and control end, and the control end connection open circuit control of switching tube is single
3rd input of unit, the outfan of switching tube connect the anode of diode, the negative electrode connection trip control unit of diode
First outfan, hot-wire coil one end connect the anode of diode, other end ground connection.
Preferably, switching tube is audion, the input of the current collection extremely switching tube of audion, and the transmitting of audion is extremely
The outfan of switching tube, the base stage of audion are the control end of switching tube.
Preferably, referrer module includes that the 8th resistance and the 9th resistance, the 8th resistance and the 9th resistance are sequentially connected in series
Between second input and ground of comparing unit, the 8th resistance is same with the junction concatenation operation amplifier of the 9th resistance
Xiang Duan.
Preferably, referrer module is a constant voltage source.
The present invention also proposes a kind of light fixture, including isolated overvoltage crowbar as above.
Compared with prior art, isolated overvoltage crowbar of the invention and light fixture, by feedback unit is set with
And trip control unit so that when circuit overvoltage, control circuit is disconnected with load, and circuit is to isolate with power supply
, this makes it possible to realize weakness control forceful electric power, not only protect circuit and load, also ensured the personal safety of user.
Description of the drawings
Fig. 1 is the circuit structure diagram of the isolated overvoltage crowbar of the present invention.
Description of reference numerals is as follows：The 4th resistance of 1 first resistor R1 second resistance R2 3rd resistor R3 of feedback unit
R4 photo-coupler U1 voltage-reference U3 comparing units 2 the 6th resistance R6 referrer modules 21 the 8th of the 5th resistance R5 are electric
The 7th resistance R7 relays of the 9th 3 diode D1 audions Q1 of resistance R9 operational amplifier U2 trip control units of resistance R8
Device K1.
Specific embodiment
In order to further illustrate the principle and structure of the present invention, the preferred embodiments of the present invention are carried out in detail in conjunction with accompanying drawing
Describe in detail bright.
Refer to Fig. 1, the isolated overvoltage crowbar of the present invention, which includes：Feedback unit 1, comparing unit 2 and disconnected
Road control unit 3.
Feedback unit 1 is used to detect whether the voltage in circuit exceedes setting value which to include input and outfan, instead
The input of feedback unit 1 connects the first power supply.Comparing unit 2, which includes first input end, the second input and outfan,
The first input end of comparing unit 2 connects the outfan of feedback unit 1, the second input connection second source of comparing unit 2.
Trip control unit 3 is controlled by comparing unit 2, and for the break-make of control circuit and load, which includes first input end, second defeated
Enter end, the 3rd input, the first outfan and the second outfan, the first input end connection first of trip control unit 3 is electric
Source, the second input connection second source of trip control unit 3, the 3rd input connection of trip control unit 3 are more single
The outfan of unit 2, the first outfan of trip control unit 3 connect the first input end of comparing unit 2, open circuit control end unit
The second outfan connection load.Wherein, when feedback unit 1 detects the voltage of circuit more than magnitude of voltage, comparing unit 2 is controlled
3 disconnecting circuit of trip control unit and the connection for loading.
Feedback unit 1 include first resistor R1, second resistance R2,3rd resistor R3, the 4th resistance R4, photo-coupler U1 with
And voltage-reference U3.First resistor R1 and second resistance R2 are connected in parallel between the input and ground of feedback unit 1, voltage reference
Reference pole connection first resistor R1 of source U3 is connected to the defeated of feedback unit 1 with the junction of second resistance R2,3rd resistor R3
Enter between end and the negative electrode of voltage-reference U3, the plus earth of voltage-reference U3, the 4th resistance R4 are connected to feedback unit 1
Input and the anode of photo-coupler U1 between, the negative electrode of photo-coupler U1 connects the negative electrode of voltage-reference U3, optocoupler
The colelctor electrode of clutch U1 connects the outfan of feedback unit 1, the grounded emitter of photo-coupler U1.
In the present embodiment, voltage-reference U3 is the three end adjustable shunt reference sources for having good thermal stability,
Its output voltage just arbitrarily can be arranged from internal reference voltage by arranging first resistor R1, the resistance of second resistance R2
Vref（2.5V）Any value in the range of 36V.Voltage-reference U3 provides the high voltage of heat stability for photo-coupler U1
A reference source U3.
Comparing unit 2 includes the 5th resistance R5, the 6th resistance R6, referrer module 21 and operational amplifier U2, and computing is put
The in-phase end connection referrer module 21 of big device U2, the end of oppisite phase of operational amplifier U2 connect the first input end of comparing unit 2, the
Five resistance R5 are connected between the first input end and ground of comparing unit 2, and the power end connection of operational amplifier U2 is more single
Second input of unit 2, the outfan of operational amplifier U2 connect the outfan of comparing unit 2.
In the present embodiment, referrer module 21 includes the 8th resistance R8 and the 9th resistance R9.8th resistance R8 and the 9th
Resistance R9 is sequentially connected in series between second input and ground of comparing unit 2, the connection of the 8th resistance R8 and the 9th resistance R9
The in-phase end of place concatenation operation amplifier U2.In other embodiments, referrer module 21 is a constant voltage source.
Trip control unit 3 includes diode D1, switching tube, the 7th resistance R7 and relay K1.Switching tube includes control
End processed, input and outfan, relay K1 include hot-wire coil and are controlled by the switch of hot-wire coil.Switch is connected to
Between the first input end of trip control unit 3 and the second outfan, the input connection trip control unit 3 of switching tube
Second input, the 7th resistance R7 are connected between the input of switching tube and control end, the control end connection open circuit of switching tube
3rd input of control unit 3, the outfan of switching tube connect the anode of diode D1, the negative electrode connection open circuit of diode D1
First outfan of control unit 3, hot-wire coil one end connect the anode of diode D1, other end ground connection.In the present embodiment, open
Pipe is closed for audion Q1, the input of the current collection extremely switching tube of audion Q1, the transmitting extremely switching tube of audion Q1 it is defeated
Go out end, the base stage of audion Q1 is the control end of switching tube.Audion can be replaced with metal-oxide-semiconductor in other embodiments.
The present invention also proposes a kind of light fixture, and light fixture includes isolated overvoltage crowbar as above.
Describe the operation principle of the present invention with reference to Fig. 1 in detail.
When the magnitude of voltage of supply line is uprised, the primary current If increases of photo-coupler U1, the other end of photo-coupler U1
Output current Ic increases；Conversely, then Ic reduces.Feedback unit 1 obtains feedback signal Ic, and Ic is converted to by the 5th resistance R5
Voltage signal VR5 is input to the end of oppisite phase of operational amplifier U2.And the homophase of operational amplifier U2 terminates a reference voltage, by
8th resistance R8, the 9th resistance R9 potential-divider networks are provided.When the voltage in supply line is uprised, Ic reduces, and VR5 reduces, computing
The output of amplifier U2 becomes big.When the voltage in supply line is uprised, the output terminal potential of operational amplifier U2 is uprised, and this causes
Pressure drop on 7th resistance R7 diminishes, and the voltage being added in the emitter stage-base stage of audion Q1 diminishes, originally three poles of conducting
Pipe Q1 is cut off, and the cut-off of audion Q1 causes the switch of relay K1 originally in attracting state to be changed into release conditions, supplies
Therefore electric line is disconnected, and circuit is in guard mode.The lock-in control for functioning as overvoltage protection of diode D1, circuit
After there is overvoltage, audion Q1 conductings, and feedback is formed by diode D1, the inverting input of operational amplifier U2 is protected
Hold in high-voltage state.Once so there is over-pressed phenomenon, before failure is resolved, circuit is always maintained at off state.
Compared with prior art, isolated overvoltage crowbar of the invention and light fixture, it dexterously uses optical coupling
Device and relay so that when circuit overvoltage, control circuit is disconnected with load, and circuit and isolated from power, thus
Weakness control forceful electric power can be realized, circuit and load is not only protected, has also been ensured the personal safety of user.
The preferable possible embodiments of the present invention are the foregoing is only, is not limited the scope of the invention.It is all to use this
Equivalent structure change done by description of the invention and accompanying drawing content, is all contained in protection scope of the present invention.
Claims (7)
1. a kind of isolated overvoltage crowbar, it is characterised in which includes：
Feedback unit, which is used to detect whether the voltage in circuit exceedes setting value which to include input and outfan, described
The input of feedback unit connects the first power supply；
Comparing unit, which includes first input end, the second input and outfan, and the first input end of the comparing unit connects
Connect the outfan of the feedback unit, the second input connection second source of the comparing unit；
Trip control unit, which is controlled by the comparing unit, and for control circuit and the break-make for loading, which includes the first input
End, the second input, the 3rd input, the first outfan and the second outfan, the first input of the trip control unit
End connection first power supply, the second input of the trip control unit connect the second source, the open circuit control
3rd input of unit connects the outfan of the comparing unit, and the first outfan connection of the trip control unit is described
The first input end of comparing unit, the second outfan of the open circuit control end unit connect the load；
Wherein, when the feedback unit detects the voltage of circuit more than magnitude of voltage, the comparing unit controls the open circuit control
Unit processed disconnects the connection of the circuit and load；
The trip control unit includes diode, switching tube, the 7th resistance and relay, and the switching tube includes control
End, input and outfan, the relay includes hot-wire coil and is controlled by the switch of the hot-wire coil, described to open
Connection is connected between the first input end and the second outfan of the trip control unit, the input connection of the switching tube
Second input of the trip control unit, the 7th resistance be connected to the switching tube input and control end it
Between, the control end of the switching tube connects the 3rd input of the trip control unit, the outfan connection of the switching tube
The anode of the diode, the negative electrode of the diode connect the first outfan of the trip control unit, the live wire
Circle one end connects the anode of the diode, other end ground connection.
2. isolated overvoltage crowbar as claimed in claim 1, it is characterised in that the feedback unit includes that first is electric
Resistance, second resistance, 3rd resistor, the 4th resistance, photo-coupler and voltage-reference, the first resistor is with second resistance simultaneously
It is associated between the input and ground of the feedback unit, the reference pole of the voltage-reference connects the first resistor and second
The junction of resistance, the 3rd resistor be connected to the input of the feedback unit and the voltage-reference negative electrode it
Between, the plus earth of the voltage-reference, the 4th resistance are connected to the input and optical coupling of the feedback unit
Between the anode of device, the negative electrode of the photo-coupler connects the negative electrode of the voltage-reference, the colelctor electrode of the photo-coupler
Connect the outfan of the feedback unit, the grounded emitter of the photo-coupler.
3. isolated overvoltage crowbar as claimed in claim 1, it is characterised in that the comparing unit includes that the 5th is electric
Resistance, the 6th resistance, referrer module and operational amplifier, the in-phase end of the operational amplifier connect the referrer module, institute
The end of oppisite phase for stating operational amplifier connects the first input end of the comparing unit, and the 5th resistance is connected to described relatively more single
Between the first input end and ground of unit, the power end of the operational amplifier connects the second input of the comparing unit,
The outfan of the operational amplifier connects the outfan of the comparing unit.
4. isolated overvoltage crowbar as claimed in claim 1, it is characterised in that the switching tube is audion, described
The input of the extremely described switching tube of the current collection of audion, the outfan of the extremely described switching tube of transmitting of the audion, institute
The base stage for stating audion is the control end of the switching tube.
5. isolated overvoltage crowbar as claimed in claim 3, it is characterised in that the referrer module includes the 8th resistance
And the 9th resistance, the 8th resistance and the 9th resistance are sequentially connected in series the second input and ground in the comparing unit
Between, the 8th resistance is connected the in-phase end of the operational amplifier with the junction of the 9th resistance.
6. isolated overvoltage crowbar as claimed in claim 3, it is characterised in that the referrer module is constant pressure electricity
Source.
7. a kind of light fixture, it is characterised in that the light fixture includes the isolated overvoltage as described in claim 1 to 6 any one
Protection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310210245.2A CN104218520B (en) | 2013-05-30 | 2013-05-30 | Isolated overvoltage crowbar and light fixture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310210245.2A CN104218520B (en) | 2013-05-30 | 2013-05-30 | Isolated overvoltage crowbar and light fixture |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104218520A CN104218520A (en) | 2014-12-17 |
| CN104218520B true CN104218520B (en) | 2017-03-29 |
Family
ID=52099768
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310210245.2A Active CN104218520B (en) | 2013-05-30 | 2013-05-30 | Isolated overvoltage crowbar and light fixture |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104218520B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105226605A (en) * | 2015-10-22 | 2016-01-06 | 江苏绿扬电子仪器集团有限公司 | A kind of high-precision signal source output overvoltage protection circuit |
| US11121547B2 (en) * | 2019-04-02 | 2021-09-14 | Analog Devices International Unlimited Company | Device and method for overvoltage protection |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101093936A (en) * | 2006-06-19 | 2007-12-26 | 上海乐金广电电子有限公司 | Device for cutting off voltage of abnormal power supply |
| CN201247419Y (en) * | 2008-08-21 | 2009-05-27 | 深圳创维－Rgb电子有限公司 | Power supply output circuit and television set |
| CN201252491Y (en) * | 2008-07-18 | 2009-06-03 | 王镇 | Overvoltage and overcurrent protecting circuit of a module power supply |
| CN102655320A (en) * | 2011-03-02 | 2012-09-05 | 海洋王照明科技股份有限公司 | Voltage control protection circuit |
-
2013
- 2013-05-30 CN CN201310210245.2A patent/CN104218520B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101093936A (en) * | 2006-06-19 | 2007-12-26 | 上海乐金广电电子有限公司 | Device for cutting off voltage of abnormal power supply |
| CN201252491Y (en) * | 2008-07-18 | 2009-06-03 | 王镇 | Overvoltage and overcurrent protecting circuit of a module power supply |
| CN201247419Y (en) * | 2008-08-21 | 2009-05-27 | 深圳创维－Rgb电子有限公司 | Power supply output circuit and television set |
| CN102655320A (en) * | 2011-03-02 | 2012-09-05 | 海洋王照明科技股份有限公司 | Voltage control protection circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104218520A (en) | 2014-12-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101867168B (en) | Power protecting circuit and LED lamp | |
| CN203180783U (en) | Boosted circuit | |
| CN110277774A (en) | With the protection circuit from the FET device for being coupled to ground by protection bus | |
| CN103855678B (en) | Overvoltage and undervoltage protection circuit of drive power source | |
| CN104218558B (en) | Anti-surging high tension protection circuit | |
| CN103369770B (en) | Light fixture thermal-shutdown circuit and device | |
| CN102723695B (en) | Leakage monitoring chip for leakage protector | |
| CN104218520B (en) | Isolated overvoltage crowbar and light fixture | |
| CN104218519A (en) | Overvoltage protection circuit and lamp | |
| CN105576603A (en) | Double-input leakage protector | |
| CN101877475B (en) | Power supply short-circuit protection circuit | |
| CN202737439U (en) | Electric leakage monitoring chip of electric leakage protector | |
| CN102088248B (en) | Intrinsically safe power supply with high output power | |
| CN103346443A (en) | Safe earth leakage protection plug giving alarm about earth wire electrification abnormity | |
| CN103683215B (en) | Short-circuit protection circuit of electronic switch | |
| CN102694541B (en) | Loop latching circuit | |
| CN103369758B (en) | Lamp protective circuit and device | |
| CN203674686U (en) | Electric leakage monitoring chip of electric leakage protector | |
| CN202150690U (en) | Protective device of auxiliary power supply | |
| CN104426125B (en) | A kind of overvoltage crowbar and the lamps and lanterns with over-voltage protecting function | |
| CN102288808A (en) | LED (light-emitting diode) over-current detection circuit and LED driving control circuit | |
| CN104734116A (en) | Electric leakage monitoring chip of electric leakage protector | |
| CN207559965U (en) | A kind of DC solid-state relay rapidly switched off | |
| CN209389690U (en) | One kind being applied to intercom internal electric source overvoltage crowbar | |
| CN205484714U (en) | Circuit is listened to killer switch state |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |