CN204104196U - LED lamp and excess temperature, overvoltage crowbar - Google Patents
LED lamp and excess temperature, overvoltage crowbar Download PDFInfo
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- CN204104196U CN204104196U CN201420589358.8U CN201420589358U CN204104196U CN 204104196 U CN204104196 U CN 204104196U CN 201420589358 U CN201420589358 U CN 201420589358U CN 204104196 U CN204104196 U CN 204104196U
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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
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The utility model discloses a kind of LED lamp and excess temperature, overvoltage crowbar, relate to LED lamp field; This LED lamp comprises the driving power circuit, the protective circuit with LED group that are connected with alternating current input power supplying; Include triode Q1 in protective circuit, triode Q1 collector electrode is connected with the output of driving power circuit, and the base stage being provided with the first resistance R1 triode Q1 between collector electrode and base stage is also connected to voltage stabilizing didoe ZD1 negative pole; The plus earth of voltage stabilizing didoe ZD1; The circuit that triode Q1 and diode ZD1 form provides reference voltage for the grid of metal-oxide-semiconductor Q2 below, and metal-oxide-semiconductor Q2 drain electrode is connected with LED group, and grid is connected with LED group positive pole after voltage stabilizing didoe DZ1.The electronic component of the protective circuit in the utility model connects simply, cost is low, can extend the useful life of LED group, reduce power; When overheat protector, LED group can not be extinguished, practical.
Description
Technical field
The utility model relates to a kind of LED lamp, particularly relates to the excess temperature of LED lamp, overvoltage crowbar, and has the LED lamp of this protective circuit.
Background technology
Energy-saving and environmental protection, light are soft, the not easily advantage such as infringement because having for LED lamp, are applied to every field widely, are subject to increasing user favor.
LED lamp business men now on the existing market of LED lamp commercially all can select comparatively simple driving power as the driving of mass production when designing and produce.The scheme of its driving power seldom has electric voltage over press and overheat protector function, and LED can only be lighted the brightness reached required for client by its function.Present LED lamp is applied in average family, and required power is less, is generally below 60w.This requires that LED is not only the LED lamp that can light, and they have further requirement to the life-span of light fixture and stability; To reduce costs as much as possible simultaneously, bring material benefit to consumer.
The subject matter that existing LED exists has:
1, illuminating LED produces a large amount of heats in use entirely, has the problem that useful life reduces and light decay is serious of LED when heat is too high; And the power source design simplified does not possess detecting LED power and lamp pearl temperature the function making it protect.
2, its scheme of driving power of household LED lamp is mainly PSR former limit feedback and BUCK scheme; These two kinds of application schemes there is no LED overheat protector in the application except the no-load protection of indispensability and short-circuit protection; More there is the output no-load voltage of some BUCK scheme power supplys higher, cause LED impaired at booting moment.This just have impact on life-span and the stability of LED lamp use in people's life.
3, the LED lamp of existing band overheat protector, when temperature is too high, meeting automatic distinguishing, makes troubles to user.
Utility model content
The utility model is disclosed a kind of LED lamp and excess temperature, overvoltage crowbar in order to solve the problem; its circuit structure is simple, cost is low; excess temperature, overvoltage protection can be realized simultaneously; effectively LED group is protected; improve the useful life of LED lamp of knowing clearly; during overheat protector, LED group can not be extinguished.
The technical solution of the utility model is as follows:
A kind of LED lamp excess temperature, overvoltage crowbar, its key is: comprise LED group and protective circuit.
Described LED group is composed in series by several LED lamp bead.
Described protective circuit has NPN type triode Q1, the collector electrode of triode Q1 is connected with positive source, triode Q1 collector electrode is connected with the positive pole of LED group, the collector electrode of triode Q1 is connected with one end of the first resistance R1, the other end of the first resistance R1 is connected with the base stage of triode Q1, and the base stage of triode Q1 is also connected to voltage stabilizing didoe ZD1 negative pole; The plus earth of voltage stabilizing didoe ZD1; The positive pole of voltage stabilizing didoe ZD1 is also connected to one end of the first electric capacity C1, and the other end of the first electric capacity C1 is also connected to the emitter of triode Q1.The emitter of triode Q1 is also connected to one end of the second resistance RT1, second resistance RT1 is the temperature resistance of negative temperature coefficient, the other end of the second resistance RT1 is through the 3rd resistance VR1 ground connection, a link is drawn between second resistance RT1 and the 3rd resistance VR1, this link is connected with the grid of the metal-oxide-semiconductor Q2 of N raceway groove, the grid of metal-oxide-semiconductor Q2 is also connected to the positive pole of voltage stabilizing didoe ZD2, and the negative pole of voltage stabilizing didoe ZD2 is connected with the positive pole of LED group; The grid of metal-oxide-semiconductor Q2 is also connected to one end of the second electric capacity C2.The other end of the second electric capacity C2 is also connected to the source electrode of metal-oxide-semiconductor Q2, the source ground of metal-oxide-semiconductor Q2.The source electrode of metal-oxide-semiconductor Q2 is also connected with the positive pole of diode M1, the negative pole of diode M1 is connected to the drain electrode of metal-oxide-semiconductor Q2, the drain electrode of metal-oxide-semiconductor Q2 is connected with the positive pole of LED group after the 4th resistance RLOAD, draw an output between the LED lamp bead of described LED group, this output is connected with the drain electrode of the metal-oxide-semiconductor Q2 in protective circuit; The negative pole of LED group and power cathode are altogether.
Preferably, the model of voltage stabilizing didoe ZD1 is MM1Z30V series.
Preferably, voltage stabilizing didoe ZD2 is P6KE series transient state killer tube.
Preferably, the 3rd resistance VR1 is adjustable resistance.
A kind of LED lamp, comprise the driving power circuit be connected with alternating current input power supplying, its key is: described LED lamp also includes above-mentioned LED lamp excess temperature, overvoltage crowbar.
The beneficial effects of the utility model:
1, have diode DZ2 and metal-oxide-semiconductor Q2 in the protective circuit in the utility model, protective circuit can realize gentle overvoltage protection simultaneously.
2, the electronic devices and components that the utility model is used are general material, with low cost.
3, the metal-oxide-semiconductor Q2 excess temperature conducting in the utility model, only can make the part LED lamp bead in LED group extinguish, and while reducing temperature, can not extinguish LED group completely; Additionally reduce the power of power supply.
4, the protective circuit in the utility model joins in the light fixture of PSR drives, solve the problem of light fixture excess temperature, overvoltage protection, and fail safe is high.
5, have employed the LED lamp of protective circuit in the utility model, in use its temperature automatic control, LED can not be caused to transship, extend useful life.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of PSR driving power circuit;
Fig. 2 is the schematic diagram of secondary negative feedback driving power circuit;
Fig. 3 is schematic diagram of the present utility model.
Embodiment
In order to better the utility model is described, be now described further with accompanying drawing in conjunction with the embodiments.
In the LED lamp field of family expenses, existing scheme mainly adopts the PSR circuit of low cost and BUCK circuit to do driving power circuit; PSR, BUCK drive circuit is using metal-oxide-semiconductor as sense switch, and the electric current when metal-oxide-semiconductor conducting controls the electric current exported, and its output voltage is that the voltage detecting IC power pole VCC controls.There is that current error is large, floating voltage is high, peripheral protection circuit is difficult to the problem that adds; Particularly PSR circuit.The application of general PSR circuit all can apply for the safety certification of concerned countries, and these certifications all can be asked for help, can to touch device must be that low-voltage cannot hurt people by electricity.Reference signal voltage port is not provided in its control circuit; And the secondary pole in this circuit is without any control circuit, therefore is difficult to add the protection circuit meeting security for all countries specification.Because protection circuit can detect the temperature in LED lamp, and voltage; After these input arrive, because of next pole without any control port so cannot power control part be fed back to.The probe detecting LED lamp temperature need to receive lamp outer casing or LED lamp bead aluminium base on if this part receives just that extremely if just there will be high pressure can be existed safe problem again by the input pole that the problem that people directly contacts directly receives power supply, specifically refer to lower Fig. 1.
PSR driving power circuit and BUCK driving power circuit these two kinds drive the control mode with the secondary pole feedback sort power supply of conventional to have obvious difference.Secondary pole feedback driving power circuit as shown in Figure 2, secondly there is error amplifier class IC in pole; Electric power output voltage can be detected, the signals such as electric current by this IC; This this circuit can connect corresponding protective circuit, but this kind of power supply cost is high.
Mentioned in PSR driving power circuit above and be difficult to add protection circuit, our present studied application mode then can add PSR circuit and can accomplish overvoltage, overheat protector.And its power output can be reduced when power supply excess temperature.Circuit connects simple, with low cost, and performance is remarkable, stable.This protective circuit effectively can detect the temperature of LED lamp; Overvoltage voltage influence can be subject to by guard lamp pearl simultaneously, can also power supply power consumption be reduced.
Be illustrated in figure 3 the schematic diagram of protective circuit of the present utility model.
LED lamp of the present utility model comprises: the protective circuit of driving power circuit, band LED group.The output of driving power circuit is connected with the input of protective circuit, and protective circuit is connected with LED group.Wherein LED group is composed in series by several LED lamp bead, is respectively LED1, LED2, LED3, LED4 ... LEDn, wherein n be greater than 1 natural number, n equals 7 in the present embodiment.The positive pole of LED group is connected with positive source, and the negative pole of LED group is connected with the negative pole of power supply.
As shown in the figure, driving power circuit is LED constant current source driving power circuit, its output is connected with the positive pole of LED group, the output of driving power circuit is also connected to the collector electrode of the NPN type triode Q1 in described protective circuit, the model of triode Q1 is MMBT2222A, be provided with the first resistance R1 between the collector electrode of triode Q1 and base stage, the base stage of triode Q1 is also connected to voltage stabilizing didoe ZD1 negative pole, the model MM1Z30V series of voltage stabilizing didoe ZD1; The plus earth of voltage stabilizing didoe ZD1; The positive pole of voltage stabilizing didoe ZD1 is also connected to one end of the first electric capacity C1, and the other end of the first electric capacity C1 is also connected to the emitter of triode Q1.The emitter of triode Q1 is also connected to one end of the second resistance RT1, and the second resistance RT1 is the temperature resistance of negative temperature coefficient, and the other end of the second resistance RT1 is through the 3rd resistance VR1 ground connection, and the 3rd resistance VR1 is adjustable resistance.Draw a link between second resistance RT1 and the 3rd resistance VR1, this link is connected with the grid of the metal-oxide-semiconductor Q2 of N raceway groove, and the grid of metal-oxide-semiconductor Q2 is also connected to the positive pole of voltage stabilizing didoe ZD2, and the negative pole of ZD2 is connected with the positive pole of LED group; The grid of metal-oxide-semiconductor Q2 is also connected to one end of the second electric capacity C2.The other end of the second electric capacity C2 is also connected to the source electrode of metal-oxide-semiconductor Q2, the source ground of metal-oxide-semiconductor Q2.The source electrode of metal-oxide-semiconductor Q2 is also connected with the positive pole of diode M1, and the negative pole of diode M1 is connected to the drain electrode of metal-oxide-semiconductor Q2, and the drain electrode of metal-oxide-semiconductor Q2 is connected with the positive pole of LED group after the 4th resistance RLOAD.Draw an output between LEDm and LEDm-1 in described LED group, wherein m is less than or equal to n, and in the present embodiment, m equals, and 6, this output is connected with the drain electrode of the metal-oxide-semiconductor Q2 in protective circuit; The minus earth of LED group.
When power supply is started working, triode Q1 collector electrode has voltage, and this voltage arrives the base stage of triode Q1 simultaneously through R1, and makes the emitter voltage of triode Q1 constant through voltage stabilizing; The burning voltage of voltage stabilizing didoe ZD1 is the conduction voltage drop of triode Q1; The linear voltage-stabilizing circuit that this circuit forms a standard to after the protection circuit that connects reference voltage is provided.Second resistance RT1 and the 3rd resistance VR1 forms bleeder circuit, provides driving voltage to the grid of metal-oxide-semiconductor Q2.Second resistance RT1 is the temperature resistance of negative temperature coefficient, on its lamp plate that can be attached to light fixture or heat sink.When the temperature of light fixture is too high, temperature resistance resistance reduces, and the voltage of metal-oxide-semiconductor Q2 grid is raised, and when temperature is elevated to protection point, the grid voltage of metal-oxide-semiconductor Q2 arrives conducting threshold values makes diode M1 conducting.After metal-oxide-semiconductor Q2 conducting, the 4th resistance RLOAD will be formed in parallel with LED group, and the 4th resistance RLOAD plays shunting effect, and the electric current in LED group is reduced.The brightness of the LED lamp bead in LED group reduces, and heat radiation reduces, and while playing overheat protector, LED group can not be extinguished.
Voltage stabilizing didoe ZD2 selects P6KE series transient state killer tube, and when LED group both end voltage is too high, voltage stabilizing didoe ZD2 starts conducting, and absorbs peak voltage; After voltage stabilizing didoe ZD2 conducting, metal-oxide-semiconductor Q2 also starts working, and is incorporated in LED group by the 4th resistance RLOAD, reduces the impulse current that LED group is subject to, to reach the problem that the LED lamp bead ensured in LED group can not be damaged by the start voltage breakdown of moment.
The drain electrode of metal-oxide-semiconductor Q2 is received in the middle of the string number of the LED lamp bead of LED group, and when LED excess temperature, metal-oxide-semiconductor Q2 conducting, can reduce a number of LED bright light.LED1 ... LED5 lights, and LED6 and LED7 is shorted extinguishing because of metal-oxide-semiconductor Q2 conducting, to reduce pyrotoxin.Make LED drive power make the defeated power of power supply diminish because output voltage diminishes simultaneously.Special instruction: the output voltage of LED drive power to change, but electric current is constant therefore selects the mode reducing output voltage to reduce driving power power output, reduces driving power temperature
Above Transmission Lines has possessed 3 heavy defencive functions as seen from the above, and its cost is also very cheap, and material therefor is versatile material on market.Above protected mode adds after in light fixture, the cost of increase light fixture that can not be more.Make originally do not have the light fixture of overheat protector to have the function of excess temperature and overvoltage protection simultaneously. also make light fixture can not extinguish in protection process simultaneously, can also normally work.Also can reduce the power consumption of power supply simultaneously, power source temperature is declined simultaneously.When temperature is replied normally, LED lamp also can be returned to the state normally lighted.Have the light fixture of above function, serviceability temperature can be controlled.Effectively can extend the useful life of light fixture and the time of light decay thereof.The brightness simultaneously also fully sending out LED extensive, and do not worry affecting the life-span because LED overload, its utilance is further improved.
Above-mentioned protective circuit can be connected to the output of PSR driving power circuit easily; Can add in the design of driving power circuit, namely PSR circuit is secondary extreme; Also can join in the design of aluminium base of LED lamp, easy to connect, simple, relative to other protective circuit, cost is cheaper.In addition this protective circuit also can join separately in the drive circuit of the other types of LED lamp, circuit that can be adaptive very abundant.
The foregoing is only embodiment of the present utility model, be not limited to the utility model, for a person skilled in the art, the utility model can have various modifications and variations.Any amendment of making, equivalent replacement, improvement etc., all should be included in right of the present utility model and so on.
Claims (5)
1. LED lamp excess temperature, an overvoltage crowbar, is characterized in that: comprise LED group and protective circuit; Described LED group is composed in series by several LED lamp bead; Described protective circuit has NPN type triode Q1, the collector electrode of triode Q1 is connected with positive source, triode Q1 collector electrode is connected with the positive pole of LED group, the collector electrode of triode Q1 is connected with one end of the first resistance R1, the other end of the first resistance R1 is connected with the base stage of triode Q1, and the base stage of triode Q1 is also connected to voltage stabilizing didoe ZD1 negative pole; The plus earth of voltage stabilizing didoe ZD1; The positive pole of voltage stabilizing didoe ZD1 is also connected to one end of the first electric capacity C1, and the other end of the first electric capacity C1 is also connected to the emitter of triode Q1; The emitter of triode Q1 is also connected to one end of the second resistance RT1, second resistance RT1 is the temperature resistance of negative temperature coefficient, the other end of the second resistance RT1 is through the 3rd resistance VR1 ground connection, a link is drawn between second resistance RT1 and the 3rd resistance VR1, this link is connected with the grid of the metal-oxide-semiconductor Q2 of N raceway groove, the grid of metal-oxide-semiconductor Q2 is also connected to the positive pole of voltage stabilizing didoe ZD2, and the negative pole of voltage stabilizing didoe ZD2 is connected with the positive pole of LED group; The grid of metal-oxide-semiconductor Q2 is also connected to one end of the second electric capacity C2; The other end of the second electric capacity C2 is also connected to the source electrode of metal-oxide-semiconductor Q2, the source ground of metal-oxide-semiconductor Q2; The source electrode of metal-oxide-semiconductor Q2 is also connected with the positive pole of diode M1, the negative pole of diode M1 is connected to the drain electrode of metal-oxide-semiconductor Q2, the drain electrode of metal-oxide-semiconductor Q2 is connected with the positive pole of LED group after the 4th resistance RLOAD, draw an output between the LED lamp bead of described LED group, this output is connected with the drain electrode of the metal-oxide-semiconductor Q2 in protective circuit; The negative pole of LED group and the negative pole of power supply are altogether.
2. LED lamp excess temperature according to claim 1, overvoltage crowbar, is characterized in that: the model of voltage stabilizing didoe ZD1 is MM1Z30V series.
3. LED lamp excess temperature according to claim 1, overvoltage crowbar, is characterized in that: voltage stabilizing didoe ZD2 is P6KE series transient state killer tube.
4. LED lamp excess temperature according to claim 1, overvoltage crowbar, is characterized in that: the 3rd resistance VR1 is adjustable resistance.
5. a LED lamp, comprises the driving power circuit be connected with alternating current input power supplying, it is characterized in that: described LED lamp also comprises any one LED lamp excess temperature, overvoltage crowbar in Claims 1-4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420589358.8U CN204104196U (en) | 2014-10-13 | 2014-10-13 | LED lamp and excess temperature, overvoltage crowbar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420589358.8U CN204104196U (en) | 2014-10-13 | 2014-10-13 | LED lamp and excess temperature, overvoltage crowbar |
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| Publication Number | Publication Date |
|---|---|
| CN204104196U true CN204104196U (en) | 2015-01-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420589358.8U Expired - Fee Related CN204104196U (en) | 2014-10-13 | 2014-10-13 | LED lamp and excess temperature, overvoltage crowbar |
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| CN (1) | CN204104196U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108575022A (en) * | 2017-11-03 | 2018-09-25 | 常州星宇车灯股份有限公司 | One kind opening circuit for car light under automobile start and stop state |
| CN112880710A (en) * | 2021-01-14 | 2021-06-01 | 安徽科达自动化集团股份有限公司 | Photoelectric detection circuit and interval type photoelectric detector with same |
| CN113659527A (en) * | 2021-06-29 | 2021-11-16 | 英特曼照明电子（常州）有限公司 | Linear power supply applied to nodes of Internet of things |
-
2014
- 2014-10-13 CN CN201420589358.8U patent/CN204104196U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108575022A (en) * | 2017-11-03 | 2018-09-25 | 常州星宇车灯股份有限公司 | One kind opening circuit for car light under automobile start and stop state |
| CN108575022B (en) * | 2017-11-03 | 2023-12-26 | 常州星宇车灯股份有限公司 | Car light starting circuit used in car starting and stopping state |
| CN112880710A (en) * | 2021-01-14 | 2021-06-01 | 安徽科达自动化集团股份有限公司 | Photoelectric detection circuit and interval type photoelectric detector with same |
| CN112880710B (en) * | 2021-01-14 | 2022-04-22 | 安徽科达自动化集团股份有限公司 | Photoelectric detection circuit and interval type photoelectric detector with same |
| CN113659527A (en) * | 2021-06-29 | 2021-11-16 | 英特曼照明电子（常州）有限公司 | Linear power supply applied to nodes of Internet of things |
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Legal Events
| Date | Code | Title | Description |
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| 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: 20150114 Termination date: 20151013 |
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| EXPY | Termination of patent right or utility model |