CN205610999U - Over -current protection circuit and LED drive circuit - Google Patents
Over -current protection circuit and LED drive circuit Download PDFInfo
- Publication number
- CN205610999U CN205610999U CN201620406772.XU CN201620406772U CN205610999U CN 205610999 U CN205610999 U CN 205610999U CN 201620406772 U CN201620406772 U CN 201620406772U CN 205610999 U CN205610999 U CN 205610999U
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- electric capacity
- branch road
- protection
- electric
- circuit
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Abstract
The utility model discloses an over -current protection circuit and LED drive circuit, the over -current protection circuit includes the first input end, an overcurrent protector, the 2nd overcurrent protector, the impedance balance ware, high pass frequency selector and first output, an overcurrent protector establishes ties with the impedance balance ware and forms first protection branch road, the 2nd overcurrent protector establishes ties with the high pass frequency selector and forms second protection branch road, first protection branch road is parallelly connected with second protection branch road, and connect between first input end and first output. Above -mentioned over -current protection circuit hinders the characteristic of low -frequency current through the logical high frequency current of high pass frequency selector, with inductive ballast when compatible, and the low -frequency current first protection branch road of flowing through, with electronic ballast when compatible, high frequency current flows through the second and protects the branch road, protects branch road and first protection branch road to carry out over -current protection through the second respectively when compatible electronic ballast or inductive ballast from this.
Description
Technical field
This utility model relates to electronic circuit field, particularly relates to a kind of circuit overcurrent protection and LED drives
Galvanic electricity road.
Background technology
Along with the development of LED (Light-Emitting Diode, light emitting diode) technology, LED lamp tube by
Gradually replace tradition CFL (Compact Fluorescent Lamp, compact fluorescent lamp, i.e. electricity-saving lamp) fluorescent tube,
Due to current CFL fluorescent tube all with Inductive ballast or electric ballast, LED lamp tube need compatible these
Electric ballast or Inductive ballast.The driver of the LED lamp tube on market have compatible electronic ballast with
The circuit overcurrent protection of Inductive ballast, circuit overcurrent protection typically uses single electric fuse to protect
Protect, carry out overcurrent protection by blown fuse；Or, circuit overcurrent protection uses two electric fuses
Protecting, the electric fuse of two different sizes mates electric ballast and the Inductive ballast of correspondence respectively,
The switching being controlled electric fuse by switching circuit realizes the over current protection in electric ballast or Inductive ballast
Protect.
But, use the LED lamp tube driver of single electric fuse, due to electric ballast and Inductive ballast
The maximum current of output is inconsistent, and the parameter of electric fuse cannot distinguish Corresponding matching, has served as current point and had arranged
Greatly, when compatible Inductive ballast, electric fuse cannot fuse, and easily causes Inductive ballast overheated and causes
The security incidents such as fire；Serve as current point and arranged too small, when compatible electronic ballast, due to electronic ballast
Device output electric current is relatively big, and electric fuse will fuse in normal operation, causes whole fluorescent tube to lose efficacy,
Therefore using single electric fuse, its matching is the best.On the other hand, two electric fuses are used to protect
LED lamp tube driver, the parameter of each electric fuse can be independently arranged, and matching is preferable, can be effective
Carry out overcurrent protection, but switching circuit be complicated, need electric ballast is detected respectively with Inductive ballast,
Then switched over by contactor, this mode relatively costly, and the switching circuit controlling switching is deposited
In bigger power attenuation, do not meet energy-conserving and environment-protective theory.
Utility model content
Based on this, it is necessary to for the problems referred to above, it is provided that a kind of switching efficiency is high, power attenuation is low, structure
Simple circuit overcurrent protection and LED drive circuit.
A kind of circuit overcurrent protection, including first input end, the first overcurrent protector, the second overcurrent protection
Device, impedence balancer, high pass frequency selector and the first outfan, described first overcurrent protector and described resistance
The series connection of anti-static organ forms the first protection branch road, and described second overcurrent protector is connected with described high pass frequency selector
Form the second protection branch road, described first protection branch road and described second protection branch circuit parallel connection, and be connected to institute
State between first input end and described first outfan.
Wherein in an embodiment, described first overcurrent protector is the first electric fuse, and described second crosses stream
Protector is the second electric fuse, and described impedence balancer is resistance, and described high pass frequency selector is electric capacity, described
First electric fuse and described resistant series form described first protection branch road, described second electric fuse and described electricity
Hold series connection and form described second protection branch road.
Wherein in an embodiment, described electric capacity includes the first electric capacity, the second electric capacity, the 3rd electric capacity and
Four electric capacity, described first electric capacity, described second electric capacity, described 3rd electric capacity and described 4th electric capacity in parallel and
It is connected between described second electric fuse and described first outfan.
This utility model provides a kind of LED drive circuit simultaneously, including circuit overcurrent protection, second defeated
Enter end, rectification circuit and the second outfan, described circuit overcurrent protection include first input end, first
Overcurrent protector, the second overcurrent protector, impedence balancer, high pass frequency selector and the first outfan, institute
State the first overcurrent protector connect with described impedence balancer formation first protection branch road, described second cross stream protect
Protect device connect with described high pass frequency selector formation second protection branch road, described first protection branch road and described second
Protection branch circuit parallel connection, and is connected between described first input end and described first outfan, described first defeated
Go out end, described second input is connected with the input of described rectification circuit, the outfan of described rectification circuit
Form described second outfan.
Wherein in an embodiment, described first overcurrent protector is the first electric fuse, and described second crosses stream
Protector is the second electric fuse, and described impedence balancer is resistance, and described high pass frequency selector is electric capacity, described
First electric fuse and described resistant series form described first protection branch road, described second electric fuse and described electricity
Hold series connection and form described second protection branch road.
Wherein in an embodiment, described electric capacity includes the first electric capacity, the second electric capacity, the 3rd electric capacity and
Four electric capacity, described first electric capacity, described second electric capacity, described 3rd electric capacity and described 4th electric capacity in parallel and
It is connected between described second electric fuse and described first outfan.
Wherein in an embodiment, described rectification circuit is bridge rectifier.
Compared with prior art, circuit overcurrent protection of the present utility model and LED drive circuit, including
One overcurrent protector, the second overcurrent protector, impedence balancer and high pass frequency selector, wherein first cross stream
Protector is connected with impedence balancer and is formed the first protection branch road, the second overcurrent protector and high pass frequency selector string
Connection formed second protection branch road, and first protection branch road with second protect branch circuit parallel connection, when with Inductive ballast
Time compatible, due to Inductive ballast output low frequency electric current, now the selecting frequency characteristic of high pass frequency selector makes second
The impedance of protection branch road is far longer than the impedance of the first protection branch road, and low-frequency current is by the first protection branch road；
When with electric ballast compatibility, owing to electric ballast exports high frequency electric, the now choosing of high pass frequency selector
Frequently characteristic makes the impedance of the second protection branch road be far smaller than the impedance of the first protection branch road, and high frequency electric passes through
Second protection branch road, protects it is achieved thereby that crossed stream by first respectively when compatible Inductive ballast or electric ballast
Protect device, the second overcurrent protector carries out overcurrent protection, and realizes the first protection branch road and the second protection branch road
Switching time without arranging actively switching circuit, circuit structure is simple, and cost is relatively low, and low in energy consumption.
Accompanying drawing explanation
Fig. 1 is the schematic block diagram of this utility model circuit overcurrent protection；
Fig. 2 is the circuit diagram of circuit overcurrent protection one embodiment shown in Fig. 1；
Fig. 3 is the circuit diagram of another embodiment of circuit overcurrent protection shown in Fig. 1；
Fig. 4 is the schematic block diagram of this utility model LED drive circuit；
Fig. 5 is the circuit diagram of LED drive circuit shown in Fig. 4.
Detailed description of the invention
Understandable for enabling above-mentioned purpose of the present utility model, feature and advantage to become apparent from, below in conjunction with attached
Detailed description of the invention of the present utility model is described in detail by figure.Elaborate much have in the following description
Body details is so that fully understanding this utility model.
Referring to Fig. 1, it is the schematic block diagram of an embodiment circuit overcurrent protection 10.Such as Fig. 1 institute
Showing, circuit overcurrent protection 10 includes that first input end the 110, first overcurrent protector 120, second crosses stream
Protector 130, impedence balancer 140, high pass frequency selector 150 and the first outfan 160.Wherein,
One overcurrent protector 120 is connected with impedence balancer 140 and is formed the first protection branch road 124.Second overcurrent protection
Device 130 is connected with high pass frequency selector 150 and is formed the second protection branch road 135.First protection branch road 124 and second
Protection branch road 135 is in parallel, and is connected between first input end 110 and the first outfan 160.
Above-mentioned circuit overcurrent protection 10, hindered by the logical low-frequency current of impedence balancer 140 high frequency electric,
And the logical high frequency electric of high pass frequency selector 150 and hinder the feature of low-frequency current, compatible with Inductive ballast
Time, low-frequency current can be by being propped up by the second protection in high impedance in low-impedance first protection branch road 124
Road 135 stops.When with electric ballast compatibility, high frequency electric can be by low-impedance second protection
Road 135 and by high impedance first protection branch road 124 stop, thus at compatible electronic ballast or inductance
Overcurrent protection effect can be played respectively by first overcurrent protector the 120, second overcurrent protector 130 during ballast,
This circuit is simple and practical and low in energy consumption.
It is appreciated that, on the one hand, owing to Inductive ballast output electric current is that (generally 50Hz is low for low-frequency current
Frequently electric current), now low-frequency current flows through the first overcurrent protector 120 and second through first input end 110 and crosses stream
Protector 130, due to the selecting frequency characteristic of high pass frequency selector 150 so that the second protection branch road 135 presents high resistant
Anti-state, by arranging the first overcurrent protector 120 for suitable parameter so that first protects branch road 124
Impedance be far smaller than the impedance of now the second protection branch road 135, and then make most electric current flow through the
One protection branch road 124, and few electric current (being negligible) flows through the second protection branch road 135 so that
First protection branch road 124 carries out overcurrent protection, now arranges the parameter of the first overcurrent protector 120
Realize operatively compatible Inductive ballast.On the other hand, due to electric ballast output electric current be high frequency electric
(representative value is 45KHz high frequency electric), now high frequency electric flows through first through first input end 110 and crosses stream guarantor
Protect device 120 and the second overcurrent protector 130, due to the selecting frequency characteristic of high pass frequency selector 150 so that second protects
Protecting branch road 135 and present low impedance state, the now impedance of the first protection branch road 124 is far longer than the second protection
The impedance of branch road 135, and then make most electric current flow through the second protection branch road 135, and few electric current
(being negligible) flows through the first protection branch road 124 so that the second protection branch road 135 carries out over current protection
Protecting, the parameter now arranging the second overcurrent protector 130 can realize operatively compatible electric ballast.
Referring to Fig. 2, it is the circuit diagram of the embodiment of circuit overcurrent protection one shown in Fig. 1, this enforcement
In example, the first overcurrent protector 120 is the first electric fuse F1, and the second overcurrent protector 130 is the second insurance
Silk F2, impedence balancer 140 is resistance R1, and high pass frequency selector 150 is electric capacity C1.First electric fuse F1
Connect with resistance R1 formation the first protection branch road Z1, the second electric fuse F2 and electric capacity C1 connects formation second
Protection branch road Z2.First protection branch road Z1 and the second protection branch road Z2 is in parallel, and is connected to first input end
Between Vin1 and the first output end vo ut1.
Referring to Fig. 3, it is the circuit diagram of another embodiment of circuit overcurrent protection shown in Fig. 1, this reality
Executing in example, electric capacity C1 includes the first electric capacity C11, the second electric capacity C12, the 3rd electric capacity C13 and the 4th electric capacity
C14, the first electric capacity C11, the second electric capacity C12, the 3rd electric capacity C13 and the 4th electric capacity C14 are in parallel and connect
Between the second electric fuse F2 and the first output end vo ut1.
It is appreciated that in the present embodiment, by the first electric capacity C11, the second electric capacity C12, the 3rd electric capacity C13
With the parallel connection of the 4th electric capacity C14, can effectively expand capacitance value, hinder to improve logical high frequency electric
The performance of low-frequency current.Certainly, high pass frequency selector 150 is not limited to the implementation shown in Fig. 2 and Fig. 3,
It can also for other forms realize circuit, as long as possess logical high frequency, resistance low frequency characteristic all in this practicality
Within novel protection domain.
Referring to Fig. 4, it is the schematic block diagram of this utility model LED drive circuit 20 1 embodiment.
As shown in Figure 4, LED drive circuit 20 includes circuit overcurrent protection, the second input 170, rectified current
Road 180 and the second outfan 190, wherein circuit overcurrent protection includes first input end the 110, first mistake
Stream protector the 120, second overcurrent protector 130, impedence balancer 140, high pass frequency selector 150 and the
One outfan 160.Concrete, the first overcurrent protector 120 is connected with impedence balancer 140 and is formed the first guarantor
Protect branch road 124.Second overcurrent protector 130 is connected with high pass frequency selector 150 and is formed the second protection branch road 135.
First protection branch road 124 is in parallel with the second protection branch road 135, and is connected to first input end 110 and first
Between outfan 160.First outfan the 160, second input 170 and the second outfan 190 respectively with
Rectification circuit 180 connects.First outfan the 160, second input 170 is to rectification circuit 180 output AC
Electricity, is exported by the second outfan 190 after alternating current rectified circuit 180 rectification.
It is appreciated that rectification circuit 180, for exporting unidirectional current, thinks that LED lamp tube provides DC source.
Further, rectification circuit 180 is bridge rectifier.
Below with detailed description of the invention, the present embodiment is described further:
Referring to Fig. 5, it is the circuit diagram of the embodiment of LED drive circuit 20 1 shown in Fig. 4, this reality
Executing in example, electric fuse F1, F2 are respectively first overcurrent protector the 120, second overcurrent protector 130, electricity
Resistance R1 is impedence balancer, and electric capacity C1, C2, C3, C4 are the frequency-selecting device of logical high frequency, after its parallel connection
Forming high pass frequency selector 150, diode D5, D6, D7, D8 connect into bridge rectifier, after rectification
Output for late-class circuit.Electric capacity CX1 is alternative electric capacity, can select according to the practical situation of circuit.
Second outfan can be used for connecting late-class circuit with electric capacity Cout for mark, i.e. its two ends, thinks late-class circuit
DC source is provided.
When LED drives compatible Inductive ballast, owing to Inductive ballast output electric current is 50Hz low frequency,
Consistent with the frequency of civil power, electric current flows through electric fuse F1 and F2 through input, due to the choosing of electric capacity C1-C4
Frequently characteristic, the second protection branch road 135 presents high impedance, hinders low-frequency current to flow through, i.e. flow through electric fuse F2
Electric current the least, and the line impedance after electric fuse F1 connects with resistance R1 is less, so compatible inductance town
During stream device, most electric current flows through electric fuse F1, and the parameter arranging electric fuse F1 exports with Inductive ballast
Currents match, can play the effect of overcurrent protection.
When LED drives compatible electronic ballast, owing to electric ballast output electric current is high frequency (representative value
For 45KHz), electric current flows through electric fuse F1 and F2 through input, due to the selecting frequency characteristic of electric capacity C1-C4,
Second protection branch road 135 presents low impedance state, much smaller than the line impedance of the first protection branch road 124, institute
During with compatible electronic ballast, most electric current flows through electric fuse F2, by arranging the parameter of F2, R1,
The parameter making F2, R1 exports currents match with electric ballast, can play overcurrent protection effect.
Thus, when compatible electronic ballast and Inductive ballast, can by F1, F2 respectively overcurrent protection
Effect, the present embodiment circuit is simple and practical, and is nearly free from power consumption, solve compatible electronic ballast with
The LED of Inductive ballast drive when testing single inefficacy cannot effectively overcurrent protection and the problem generated heat,
While increasing overall system security, the most do not affect the efficiency of system.
The utility model has the advantage of: by passive type Dual-fuse switching circuit, can be for electronic ballast
Device carries out single overcurrent with Inductive ballast and mates, and makes LED driver at compatible electronic ballast and electricity
Effective overcurrent protection all can be played during sense ballast, and with low cost, it is lost minimum.
The LED lamp tube of compatible electronic ballast and Inductive ballast can well be solved by this utility model
Overcurrent protection, be run through CCC (China Compulsory Certification, Compulsory Certification of Products),
CE (CONFORMITE EUROPEENNE, European market mark of safety certification), VDE (Verband
Deutscher Elektrotechniker, German National product certification) etc. secure authentication testing, and need not increase
Added multicomponent device.Using the overcurrent protection switching of passive type, circuit reliability is high, and Circuit responce is rapid,
When compatible electronic ballast is with Inductive ballast, the overcurrent that the component damage after electric fuse causes is equal
The effect of being effectively protected can be played, it is to avoid cause more loss and security incident.
And this utility model is owing to using passive type framework, self does not produce EMI (Electro Magnetic
Susceptibility, electromagnetic interference) interference, peripheral circuit is not produced interference, there is the feature of high reliability.
Each technical characteristic of embodiment described above can combine arbitrarily, for making description succinct, the most right
The all possible combination of each technical characteristic in above-described embodiment is all described, but, if these skills
There is not contradiction in the combination of art feature, is all considered to be the scope that this specification is recorded.
Embodiment described above only have expressed several embodiments of the present utility model, its describe more concrete and
In detail, but therefore can not be interpreted as the restriction to utility model patent scope.It should be pointed out that, it is right
For those of ordinary skill in the art, without departing from the concept of the premise utility, it is also possible to do
Going out some deformation and improvement, these broadly fall into protection domain of the present utility model.Therefore, this utility model is special
The protection domain of profit should be as the criterion with claims.
Claims (7)
1. a circuit overcurrent protection, it is characterised in that include first input end, the first overcurrent protector,
Second overcurrent protector, impedence balancer, high pass frequency selector and the first outfan, described first crosses stream protects
Protect device to connect with described impedence balancer formation the first protection branch road, described second overcurrent protector and described height
Logical frequency selector series connection forms the second protection branch road, described first protection branch road and described second protection branch circuit parallel connection,
And be connected between described first input end and described first outfan.
Circuit overcurrent protection the most according to claim 1, it is characterised in that described first crosses stream protects
Protecting device is the first electric fuse, and described second overcurrent protector is the second electric fuse, and described impedence balancer is electricity
Resistance, described high pass frequency selector is electric capacity, and described first electric fuse and described resistant series form described first and protect
Protecting branch road, described second electric fuse and described capacitances in series form described second protection branch road.
Circuit overcurrent protection the most according to claim 2, it is characterised in that described electric capacity includes
One electric capacity, the second electric capacity, the 3rd electric capacity and the 4th electric capacity, described first electric capacity, described second electric capacity, institute
State the 3rd electric capacity and described 4th electric capacity in parallel and be connected to described second electric fuse and described first outfan it
Between.
4. a LED drive circuit, it is characterised in that include circuit overcurrent protection, the second input,
Rectification circuit and the second outfan, described circuit overcurrent protection includes that first input end, the first stream excessively are protected
Protect device, the second overcurrent protector, impedence balancer, high pass frequency selector and the first outfan, described first
Overcurrent protector connect with described impedence balancer formation first protection branch road, described second overcurrent protector with
The series connection of described high pass frequency selector forms the second protection branch road, described first protection branch road and described second protection
Road is in parallel, and is connected between described first input end and described first outfan, described first outfan,
Described second input is connected with the input of described rectification circuit, and the outfan of described rectification circuit forms institute
State the second outfan.
LED drive circuit the most according to claim 4, it is characterised in that described first crosses stream protects
Protecting device is the first electric fuse, and described second overcurrent protector is the second electric fuse, and described impedence balancer is electricity
Resistance, described high pass frequency selector is electric capacity, and described first electric fuse and described resistant series form described first and protect
Protecting branch road, described second electric fuse and described capacitances in series form described second protection branch road.
LED drive circuit the most according to claim 5, it is characterised in that described electric capacity includes
One electric capacity, the second electric capacity, the 3rd electric capacity and the 4th electric capacity, described first electric capacity, described second electric capacity, institute
State the 3rd electric capacity and described 4th electric capacity in parallel and be connected to described second electric fuse and described first outfan it
Between.
LED drive circuit the most according to claim 4, it is characterised in that described rectification circuit is
Bridge rectifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620406772.XU CN205610999U (en) | 2016-05-05 | 2016-05-05 | Over -current protection circuit and LED drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620406772.XU CN205610999U (en) | 2016-05-05 | 2016-05-05 | Over -current protection circuit and LED drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205610999U true CN205610999U (en) | 2016-09-28 |
Family
ID=56968262
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620406772.XU Expired - Fee Related CN205610999U (en) | 2016-05-05 | 2016-05-05 | Over -current protection circuit and LED drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205610999U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107734778A (en) * | 2017-11-13 | 2018-02-23 | 江西美的贵雅照明有限公司 | LED drive power circuit and luminaire |
| CN109307814A (en) * | 2018-10-16 | 2019-02-05 | 江西合力泰科技有限公司 | A kind of capacitor reliability test circuit |
-
2016
- 2016-05-05 CN CN201620406772.XU patent/CN205610999U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107734778A (en) * | 2017-11-13 | 2018-02-23 | 江西美的贵雅照明有限公司 | LED drive power circuit and luminaire |
| CN107734778B (en) * | 2017-11-13 | 2024-02-09 | 美智光电科技股份有限公司 | LED driving power circuit and light emitting device |
| CN109307814A (en) * | 2018-10-16 | 2019-02-05 | 江西合力泰科技有限公司 | A kind of capacitor reliability test circuit |
| CN109307814B (en) * | 2018-10-16 | 2024-04-12 | 江西合力泰科技有限公司 | Capacitor reliability test circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160928 Termination date: 20190505 |
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| CF01 | Termination of patent right due to non-payment of annual fee |