CN202941026U - LED lamp with lightning-stroke resistant and automatic temperature-control function - Google Patents
LED lamp with lightning-stroke resistant and automatic temperature-control function Download PDFInfo
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- CN202941026U CN202941026U CN 201220683804 CN201220683804U CN202941026U CN 202941026 U CN202941026 U CN 202941026U CN 201220683804 CN201220683804 CN 201220683804 CN 201220683804 U CN201220683804 U CN 201220683804U CN 202941026 U CN202941026 U CN 202941026U
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Abstract
An LED lamp with lightning-stroke resistant and automatic temperature-control functions comprises a voltage reduction capacitor (C1), a rectifier bridge (100), a filtering capacitor (C2), a temperature control and current limitation circuit (200) and an LED assembly five parts, wherein the rectifier bridge (100) consists of a leg I (101), a leg II (102), a leg III (103) and a leg IV (104). The temperature control and current limitation circuit (200) consists of a triode (V), a positive temperature-coefficient thermistor (PTC), a voltage stabilizing diode (DW) and a bias resistor (R).
Description
Technical field
The present invention relates to LED lamp field, relate in particular to a kind of " having the LED lamp of anti-lightning and temperature automatically controlled function concurrently " with anti-lightning, temperature automatically controlled, automatic current limiting function.
Background technology
Energy-saving and environmental protection, long-life, response are fast because having for the LED lamp, rich color, the serial advantage such as controlled, and regarded as by people: promoting the LED lamp, is that the best of light fixture economize on electricity consumption reduction realizes approach.Japan estimates: if with the LED lamp substitute Japan half incandescent lamp and fluorescent lamp, equivalence every year be 6,000,000,000 liters of crude oil of Japan's saving! Someone even thinks: the LED lamp is the mankind's one of the most great inventions after the Edison invented incandescent lamp bulb.
The driving power (this paper is called for short driving power) of lamp housing (or claim lampshade), light-emitting diode (Light Emitting Diode) assembly (this paper is called for short the LED assembly), LED assembly is that shell, LED assembly, driving power are three large component parts of LED lamp.
Driving power is the vitals of LED lamp, only has the driving power superior performance, and the LED lamp just can present economize on electricity, long-life advantage.
For driving power importance, the technical staff in electronics, electrical apparatus industry studies, has designed multiple LED lamp driving power source.Chinese patent application number is that 201120309550.3 " a kind of LED lamp electric supply system ", application number are that 200710037934.2 " LED driving power ", application number are that 201110031371.2 " a kind of multiple constant current high-power LED driving power source " discloses patent applicant's achievement in research separately for " adjustable LED lamp power driving circuit ", the application number of 201020214658.X.
The common feature of above-mentioned public technology is: complicated, the used electronic devices and components of electronic circuit are too many.
The LED lamp is only a kind of low price light fixture that will unexpectedly strive mutually with incandescent lamp and fluorescent lamp after all, the military radar that non-value is ten million yuan.The too many LED lamp driving power source of electronic devices and components that electronic circuit is too complicated, used will be high because of cost, reliability is low (electronic devices and components used are many, just mean that cost is high, reliability is low) and without practical value.
Although have advantages of that electronic circuit electronic devices and components simple, used are few, cost is low, also there is following shortcoming in the present LED lamp driving power source of comparatively popular " resistance-capacitance depressurization, rectifier bridge rectification, capacitor filtering " in light fixture market:
1, without the function of the hard pulse infringement of anti-lightning lightning or static discharge (ESD), electric fast transition (EFT).Obviously, if the driving power of LED lamp without the function of resisting above-mentioned hard pulse, the LED lamp is subject to the impact of above-mentioned hard pulse and damages;
2, without the function of temperature negative feedback and Current Negative Three-Point Capacitance.By the operation principle of LED as can be known, the PN junction of LED has negative temperature coefficient, that is: when temperature raise, the potential barrier electromotive force of described PN junction can reduce.If the driving power of LED lamp is without the function of temperature negative feedback and Current Negative Three-Point Capacitance, along with the continuous rising of working temperature, the electric current of LED lamp can be increasing, and therefore the LED lantern festival is damaged.
Summary of the invention
For the present situation of prior art, the present invention want Da to target be:
1, grasping the starting point of " must to letter, having simple and practical ability only and spread for a long time to essence ", application electric technology designs an electronic circuit simple, the used device LED lamp few, that price is tried one's best honest and clean of trying one's best as far as possible;
2, designed LED lamp has the function of " anti-lightning lightning, anti-electrostatic discharging (ESD), anti-electric fast transition (EFT) " concurrently;
3, designed LED lamp has the function of " reaching temperature automatically controlled to the LED lamp by the temperature negative feedback " concurrently;
4, designed LED lamp has the function of " reaching the current-limiting protection of LED lamp by Current Negative Three-Point Capacitance " concurrently;
In order to reach above-mentioned target, the technical scheme of the present invention's design is: a kind of LED lamp that has anti-lightning and temperature automatically controlled function concurrently, a kind of LED lamp that has anti-lightning and temperature automatically controlled function concurrently, comprise decompression capacitor (C1), rectifier bridge (100), filter capacitor (C2), temperature control and current-limiting circuit (200) and LED assembly five parts, described rectifier bridge (100) is comprised of brachium pontis one (101), brachium pontis two (102), brachium pontis three (103) and brachium pontis four (104); Wherein, described brachium pontis one (101), brachium pontis three (a 103) end separately links together becomes the first input end of described rectifier bridge (100) (1), and described brachium pontis two (102), brachium pontis four (a 104) end separately links together becomes the second input of described rectifier bridge (100) (2); Described brachium pontis one (101), brachium pontis two (102) other end separately links together becomes the first output of described rectifier bridge (100) (3), and described brachium pontis three (103), brachium pontis four (104) other end separately links together becomes the second output of described rectifier bridge (100) (4); Second output (4) of described rectifier bridge (100) is connected with circuit ground; The first end (P1) of one termination AC voltage of described decompression capacitor (C1), the first input end (1) of the described rectifier bridge of another termination (100); First output (3) of the described rectifier bridge of anodal termination (100) of described filter capacitor (C2), negative pole end is connected with circuit ground; One end of described temperature control and current-limiting circuit (200) is connected with first output (3) of described rectifier bridge (100), and the other end is the output (5) of this temperature control and current-limiting circuit (200); Second end (P2) of AC voltage is connected with second input (2) of described rectifier bridge (100);
The positive pole of LED assembly (300) is connected with the output (5) of described temperature control and current-limiting circuit (200), and its negative pole is connected with second output (4) of rectifier bridge (100);
Described brachium pontis one (101) is made of the first rectifier diode (D1), and, the positive pole of described the first rectifier diode (D1) connects the first input end (1) of described rectifier bridge (100), and negative pole connects first output (3) of described rectifier bridge (100);
Described brachium pontis two (102) is made of the second rectifier diode (D2), and, the positive pole of described the second rectifier diode (D2) connects second input (2) of described rectifier bridge (100), and negative pole connects first output (3) of described rectifier bridge (100);
Described brachium pontis three (103) is by the second monopole type transient voltage suppressor diode (TVS2,) formation (TVS is Unipolar transient voltage suppression diode), and, first input end (the 1) positive pole that the negative pole of described the second monopole type transient voltage suppressor diode (TVS2) connects described rectifier bridge (100) connects second output (4) of described rectifier bridge;
Described brachium pontis four (104) is made of the first monopole type transient voltage suppressor diode (TVS1), and, the negative pole of described the first monopole type transient voltage suppressor diode (TVS1) connects second input (2) of described rectifier bridge (100), and positive pole connects second output (4) of described rectifier bridge.
This temperature control and current-limiting circuit (200) by triode (
V）, semistor (PTC), voltage stabilizing didoe (DW) and biasing resistor (R) form; And, described triode (
V）Collector electrode be connected with first output (3) of described rectifier bridge (100), emitter is connected with an end of described semistor (PTC), base stage is connected with an end of described biasing resistor (R) and the negative pole of described voltage stabilizing didoe (DW); The other end anodal and described semistor (PTC) of described voltage stabilizing didoe (DW) all is connected with the output (5) of this temperature control and current-limiting circuit; The other end of described biasing resistor (R) is connected with first output (3) of described rectifier bridge (100).
Described monopole type transient voltage suppressor diode TVS1, TVS2 can use piezo-resistance (Voltage Dependent Resistor) or voltage stabilizing didoe to substitute, but preferential Bian monopole type transient voltage suppressor diode.
In normal operating conditions, when AC voltage is positive half cycle, the first rectifier diode D1 and the first equal conducting of monopole type transient voltage suppressor diode TVS1, the second rectifier diode D2 and the second monopole type transient voltage suppressor diode TVS2 all end; When AC voltage was negative half period, the first rectifier diode D1 and the first monopole type transient voltage suppressor diode TVS1 all ended, the second rectifier diode D2 and the second equal conducting of monopole type transient voltage suppressor diode TVS2;
When harmful hard pulse of thunderbolt lightning, static discharge or electric fast transition is invaded, be equivalent short-circuit condition between the input 1 of described rectifier bridge, input 2;
When temperature rises, the program start that the temperature negative feedback is temperature automatically controlled, the rising of semistor PTC resistance, the operating current I0 of LED assembly descends; ,
When operating current I0 rises, the program start of Current Negative Three-Point Capacitance automatic current limiting, the voltage U e5 at thermistor PTC two ends rises, and the base stage of triode V and the voltage U be between emitter descend, and triode V collector current Ic descends;
When AC voltage is positive half cycle, the charging of decompression capacitor C1 positive direction; When AC voltage was negative half period, decompression capacitor C1 charged in the other direction.
The long operation result of theory analysis and experimental prototype (electronic component of the present invention is few, and model machine is easy to do) all proves, uses the present invention, can obtain following beneficial effect:
1, because the present invention has the function of anti-lightning lightning, anti-electrostatic discharging (ESD), anti-electric fast transition (EFT) concurrently, so, the infringement of the hard pulse that lightning, static discharge or electric fast transition produce that can make the LED lamp avoid being struck by lightning;
2, because the present invention has the degenerative function of temperature concurrently, so, can make the LED lamp realize that temperature is temperature automatically controlled, prevent that the LED light temperature is too high and damage;
3, because the present invention has the function of Current Negative Three-Point Capacitance concurrently, so, can make the LED lamp realize current-limiting protection.
Description of drawings
Fig. 1 is functional-block diagram of the present invention;
Fig. 2 is the circuit theory diagrams of embodiment 1;
Fig. 3 is the circuit theory diagrams of embodiment 2;
Fig. 4 is the V-I characteristic curve of monopole type transient voltage suppressor diode, and in figure, uB is its reverse breakdown voltage.
Embodiment
Below in conjunction with accompanying drawing, the first execution mode of the present invention is described.
Fig. 1 is functional-block diagram of the present invention, and in figure, dashed rectangle represents rectifier bridge 100.The first embodiment of the present invention is comprised of decompression capacitor C1, rectifier bridge 100, filter capacitor C2, temperature control and current-limiting circuit 200 and LED assembly 300, it is characterized in that: described rectifier bridge 100 is comprised of brachium pontis 1, brachium pontis 2 102, brachium pontis 3 103 and brachium pontis 4 104; And described brachium pontis 1, brachium pontis 3 103 end separately links together and becomes the input of described rectifier bridge 100 1, and described brachium pontis 2 102, brachium pontis 4 104 end separately links together and becomes the input of described rectifier bridge 100 2; Described brachium pontis 1, brachium pontis 2 102 other end separately links together becomes the output of described rectifier bridge 100 3, and described brachium pontis 3 103, brachium pontis 4 104 other end separately links together becomes the output of described rectifier bridge 100 4; The output 4 of described rectifier bridge 100 is connected with circuit ground; One end of the termination AC voltage of described decompression capacitor C1 is the P1 end, the input 1 of the described rectifier bridge 100 of another termination; The output 3 of the described rectifier bridge 100 of anodal termination of described filter capacitor C2, negative pole end is connected with circuit ground; One end of described temperature control and current-limiting circuit 200 is connected with the output 3 of described rectifier bridge 100, its output 5 of another termination; The other end of AC voltage is that the P2 end is connected with the input 2 of described rectifier bridge 100;
In conjunction with Fig. 1, load of the present invention is LED assembly 300 again, and its anode is connected with the output 5 of described temperature control and current-limiting circuit 200, and negative terminal is connected with circuit ground.
It will be apparent to those skilled in the art: the P1 of described AC voltage holds, the P2 end can reciprocity.
In conjunction with Fig. 1, Fig. 2, described brachium pontis 1 is made of the first rectifier diode D1, and the positive pole of described the first rectifier diode D1 connects the input 1 of described rectifier bridge 100, and negative pole connects the output 3 of described rectifier bridge 100.
Described brachium pontis 2 102 is made of the second rectifier diode D2, and the positive pole of described the second rectifier diode D2 connects the input 2 of described rectifier bridge 100, and negative pole connects the output 3 of described rectifier bridge 100.
Described brachium pontis 3 103 is made of the second monopole type transient voltage suppressor diode TVS2, and the negative pole of described TVS2 connects the input 1 of described rectifier bridge 100, and positive pole connects the output 4 of described rectifier bridge 100.
Described brachium pontis 4 104 is made of the first monopole type transient voltage suppressor diode TVS1, and the negative pole of described TVS1 connects the input 2 of described rectifier bridge 100, and positive pole connects the output 4 of described rectifier bridge 100.
Described temperature control and current-limiting circuit 200 are by triode
V, semistor PTC, voltage stabilizing didoe DW and biasing resistor R form; And, described triode
VCollector electrode be connected with the output 3 of described rectifier bridge 100, emitter is connected with the end of described semistor PTC, base stage is connected with the end of described biasing resistor R and the negative pole of described voltage stabilizing didoe DW; The other end anodal and described semistor PTC of described voltage stabilizing didoe DW all is connected with the output 5 of this temperature control and current-limiting circuit 200; The other end of described biasing resistor R is connected with the output 3 of described rectifier bridge 100.
The load of the present embodiment 1 is LED assembly 300, and its anode is connected with the output 5 of described temperature control and current-limiting circuit 200, and negative terminal is connected with circuit ground.
The course of work of the present invention can be set forth respectively by following different operating state:
1, normal operating conditions:
In conjunction with Fig. 1, Fig. 2, Fig. 4, when AC voltage is normal condition, when being nothing between port P1, port P2 " the harmful hard pulse of thunderbolt lightning, static discharge (ESD) or electric fast transition (EFT) is invaded ", the AC voltage of input is after decompression capacitor C1 step-down, be u at the input 1 of described rectifier bridge 100, voltage between input 2, u can represent with following (1) formula:
u=U12sin（2πft＋φ）…………………………（1）
In above-mentioned (1) formula, U12 is the amplitude of voltage u, and f is the frequency of AC voltage, and φ is the initial phase angle of voltage u.
In conjunction with Fig. 1, Fig. 4, when normal operating conditions, the amplitude U12 of described voltage u satisfies following condition: U12＜UB again ... (2)
In above-mentioned (1) formula, UB is the reverse breakdown voltage of the first monopole type transient voltage suppressor diode TVS1 in the second monopole type transient voltage suppressor diode TVS2, brachium pontis 4 104 in brachium pontis 3 103.Easy for narrating, the reverse breakdown voltage value of establishing described TVS2, TVS1 equates to be UB
When AC voltage is positive half cycle, be that voltage u is that input 2 that the input 1 of rectifier bridge 100 is in high level, rectifier bridge 100 is when being in low level state and U12＜UB, the second monopole type transient voltage suppressor diode TVS2 in the second rectifier diode D2 in brachium pontis 2 102 and brachium pontis 3 103 is all because reverse bias ends, and equivalence is open circuit; The first monopole type transient voltage suppressor diode TVS1 in the first rectifier diode D1 in brachium pontis 1 and brachium pontis 4 104 is all because of the forward bias conducting.Change says it: when AC voltage was positive half cycle and U12＜UB, brachium pontis two all end with brachium pontis three, brachium pontis one and the equal conducting of brachium pontis four, and electric current I 0 is along the path flow of P1-C1-D1-temperature control and current-limiting circuit 200-LED assembly 300-TVS1-P2;
In this process, (when electric current I 0 flowed to P2 by P1, the charging process of decompression capacitor C1 claimed " positive direction charging ", discharge process to claim " positive direction discharge " to the charging of decompression capacitor C1 positive direction; Otherwise claim " charging in the other direction " or " discharge in the other direction ")
When AC voltage is negative half period, be that voltage u is input 2 that the input 1 of rectifier bridge 100 is in low level, rectifier bridge 100 when being in the state of high level and U12＜UB, the second monopole type transient voltage suppressor diode TVS2 in the second rectifier diode D2 in brachium pontis 2 102 and brachium pontis 3 103 is all because of the forward bias conducting; The first monopole type transient voltage suppressor diode TVS1 in the first rectifier diode D1 in brachium pontis 1 and brachium pontis 4 104 is all because reverse bias ends, and equivalence is open circuit.Change says it: when AC voltage is negative half period and U12＜UB, and brachium pontis two and the equal conducting of brachium pontis three, brachium pontis one and brachium pontis four all end, and electric current I 0 is along the path flow of P2-D2-temperature control and current-limiting circuit 200-LED assembly 300-TVS2-C1-P1;
In this process, first discharge in the other direction of decompression capacitor C1 charging in the other direction again.
In sum and in brief: in normal operating conditions, when AC voltage was positive half cycle, brachium pontis two all end with brachium pontis three, brachium pontis one and the equal conducting of brachium pontis four; When AC voltage is negative half period, brachium pontis two and the equal conducting of brachium pontis three, brachium pontis one all ends with brachium pontis four.
In normal operating conditions, when AC voltage is positive half cycle, the charging of decompression capacitor C1 positive direction; When AC voltage was negative half period, decompression capacitor C1 charged in the other direction.
State when 2, harmful hard pulse of thunderbolt lightning, static discharge (ESD) or electric fast transition (EFT) is invaded:
(1) the harmful hard pulse when intrusion is positive pulse, the input 1 that is rectifier bridge 100 is in high level, the input 2 of rectifier bridge 100 is in low level state, and harmful hard pulse of invading is at described input 1, during the pulse amplitude V12 between input 2＞UB, the first monopole type transient voltage suppressor diode TVS1 in brachium pontis 4 104 is because of the forward bias conducting, the second monopole type transient voltage suppressor diode TVS2 in brachium pontis 3 103 is short circuit because of the reverse breakdown equivalence, it is the input 1 of described rectifier bridge 100, input impedance between input 2 → 0, equivalence is short circuit, late-class circuit just is protected and exempts from the thunderbolt lightning, the infringement of harmful hard pulse that static discharge or electric fast transition produce,
(2) the harmful hard pulse when intrusion is negative pulse, the input 1 that is rectifier bridge 100 is in low level, the input 2 of rectifier bridge 100 is in the state of high level, and harmful hard pulse of invading is at described input 2, during the pulse amplitude V21 between input 1＞UB, the second monopole type transient voltage suppressor diode TVS2 in brachium pontis 3 103 is because of the forward bias conducting, the first monopole type transient voltage suppressor diode TVS1 in brachium pontis 4 104 is short circuit because of the reverse breakdown equivalence, it is the input 2 of described rectifier bridge 100, input impedance between input 1 → 0, equivalence is short circuit, late-class circuit just is protected and exempts from the thunderbolt lightning, the infringement of harmful hard pulse that static discharge or electric fast transition produce,
In sum and in brief: when harmful positive pulses such as thunderbolt lightning were invaded, described TVS1 was because of the forward bias conducting, and described TVS2 is short circuit because of the reverse breakdown equivalence; When harmful negative pulses such as thunderbolt lightning were invaded, described TVS2 was because of the forward bias conducting, and described TVS1 is short circuit because of the reverse breakdown equivalence.
State when 3, temperature raises
By the operation principle of LED as can be known, the PN junction of LED has negative temperature coefficient, that is: when temperature raise, the potential barrier electromotive force of described PN junction can reduce.If the driving power of LED lamp is without the function of temperature negative feedback and Current Negative Three-Point Capacitance, along with the continuous rising of working temperature, the electric current of LED lamp can be increasing, and therefore the LED lantern festival is damaged.
In conjunction with Fig. 1, Fig. 2, suitably adjust biasing resistor R, can make voltage stabilizing didoe DW enter the voltage stabilizing state of reverse breakdown, its both end voltage Ub5 is just stationary value.On the other hand, the rising of temperature will cause the resistance of semistor PTC to rise; The rising of semistor PTC resistance will cause the voltage U e5 at its two ends to rise; Because base stage and the voltage between emitter of triode V is Ube, and:
Ube＝Ub5－Ue5……………………………………………（3）
So the rising of Ue5 will cause the base stage of triode V and the voltage U be between emitter to descend; According to the characteristic of triode, the voltage U be between its base stage and emitter descends, and will cause its collector current Ic to descend; Because the operating current of LED assembly 300 is I0, and:
I0＝Ic＋I1………………………………………………（4）
So the decline of Ic will cause the operating current I0 of LED assembly 300 to descend; The decline of I0 will cause the temperature of LED lamp to descend.The present invention has just realized the function of " reaching temperature automatically controlled to the LED lamp by the temperature negative feedback ".
In above-mentioned (4) formula, I1 is the electric current on biasing resistor R.
In sum as can be known: the present invention realizes temperature automatically controlled function by following program by the temperature negative feedback: the operating current I0 decline-temperature of the base stage of temperature rising-triode V and the voltage U be decline-triode V collector current Ic decline-LED assembly 300 between emitter descends.Sketch it: temperature rising-Ube decline-Ic decline-I0 decline-temperature descends.
In brief: when temperature rises, the temperature automatically controlled program of start-up temperature negative feedback of the present invention, the rising of semistor PTC resistance, the operating current I0 of LED assembly 300 descends.
State when 4, operating current I0 rises
In conjunction with Fig. 1, Fig. 2, when operating current I0 rises, will cause the voltage U e5 rising at described thermistor PTC two ends; By (3) formula as can be known, the rising of Ue5 will cause the base stage of triode V and the voltage U be between emitter to descend; According to the characteristic of triode, the voltage U be between its base stage and emitter descends, and will cause its collector current Ic to descend; By (4) formula as can be known, the decline of Ic will cause the operating current I0 of LED assembly 300 to descend.The present invention has just realized the function of " reaching the current-limiting protection of LED lamp by Current Negative Three-Point Capacitance ".
In sum as can be known: the present invention realizes the function of automatic current limiting by Current Negative Three-Point Capacitance by following program: the base stage of the voltage U e5 rising-triode V at operating current I0 rising-thermistor PTC two ends and the voltage U be decline-triode V collector current Ic decline-operating current I0 between emitter descend.Sketch it: operating current I0 rising-Ue5 rising-Ube decline-Ic decline-operating current I0 descends.
In brief: when operating current I0 rises, the program of starting current negative feedback automatic current limiting of the present invention, the voltage U e5 at thermistor PTC two ends rises, and the base stage of triode V and the voltage U be between emitter descend, and triode V collector current Ic descends.
The technical characterictic of the present embodiment 1:
1, in normal operating conditions, when AC voltage is positive half cycle, the first rectifier diode D1 and the first equal conducting of monopole type transient voltage suppressor diode TVS1, the second rectifier diode D2 and the second monopole type transient voltage suppressor diode TVS2 all end; When AC voltage was negative half period, the first rectifier diode D1 and the first monopole type transient voltage suppressor diode TVS1 all ended, the second rectifier diode D2 and the second equal conducting of monopole type transient voltage suppressor diode TVS2;
2, when harmful hard pulse of thunderbolt lightning, static discharge or electric fast transition is invaded, be equivalent short-circuit condition between the input 1 of described rectifier bridge 100, input 2;
When 3, temperature rises, the program start that the temperature negative feedback is temperature automatically controlled, the rising of semistor PTC resistance, the operating current I0 of LED assembly 300 descends; ,
When 4, operating current I0 rises, the program start of Current Negative Three-Point Capacitance automatic current limiting, the voltage U e5 at thermistor PTC two ends rises, and the base stage of triode V and the voltage U be between emitter descend, and triode V collector current Ic descends;
5, when AC voltage is positive half cycle, the charging of decompression capacitor C1 positive direction; When AC voltage was negative half period, decompression capacitor C1 charged in the other direction.
By its discharge resistance of existing " RC step-down " technical configuration, it will be apparent to those skilled in the art: the present embodiment 1 is done such design can bring following beneficial effect to the decompression capacitor C1 of the present embodiment 1:
1, omitted one " discharge resistance ";
If 2 adopt existing " RC step-down " technology, after the shutdown of LED lamp, the electric charge on decompression capacitor is drained by its discharge resistance, and when the LED lamp was started shooting again, decompression capacitor was equivalent to short circuit, and it will be subjected to " start is impacted " of AC voltage; The decompression capacitor of the present embodiment 1 is because of without corresponding " discharge resistance ", and therefore, after the shutdown of LED lamp, described decompression capacitor C1 still is filled with electric charge, therefore be subjected to " start is impacted " little, therefore extended its useful life.
Fig. 3 is the circuit theory diagrams of embodiment 2, and the present embodiment 2 is with the brachium pontis one in embodiment 1, brachium pontis four, and three reciprocity simultaneously of brachium pontis two, brachium pontis are also deleted decompression capacitor C1 and are designed to " having the LED lamp driving power source of anti-lightning and temperature automatically controlled function concurrently ".
It will be apparent to those skilled in the art, operation principle, the course of work of making the embodiment 2 that above-mentioned change designs afterwards are all identical with embodiment 1.
Claims (3)
1. a LED lamp that has anti-lightning and temperature automatically controlled function concurrently, comprise decompression capacitor (C1), rectifier bridge (100), filter capacitor (C2), temperature control and current-limiting circuit (200) and LED assembly five parts, it is characterized in that:
Described rectifier bridge (100) is comprised of brachium pontis one (101), brachium pontis two (102), brachium pontis three (103) and brachium pontis four (104); Wherein, described brachium pontis one (101), brachium pontis three (a 103) end separately links together becomes the first input end of described rectifier bridge (100) (1), and described brachium pontis two (102), brachium pontis four (a 104) end separately links together becomes the second input of described rectifier bridge (100) (2); Described brachium pontis one (101), brachium pontis two (102) other end separately links together becomes the first output of described rectifier bridge (100) (3), and described brachium pontis three (103), brachium pontis four (104) other end separately links together becomes the second output of described rectifier bridge (100) (4); Second output (4) of described rectifier bridge (100) is connected with circuit ground; The first end (P1) of one termination AC voltage of described decompression capacitor (C1), the first input end (1) of the described rectifier bridge of another termination (100); First output (3) of the described rectifier bridge of anodal termination (100) of described filter capacitor (C2), negative pole end is connected with circuit ground; One end of described temperature control and current-limiting circuit (200) is connected with first output (3) of described rectifier bridge (100), and the other end is the output (5) of this temperature control and current-limiting circuit (200); Second end (P2) of AC voltage is connected with second input (2) of described rectifier bridge (100);
The positive pole of LED assembly (300) is connected with the output (5) of described temperature control and current-limiting circuit (200), and its negative pole is connected with second output (4) of rectifier bridge (100).
2. the LED lamp that has anti-lightning and temperature automatically controlled function concurrently as claimed in claim 1 is characterized in that:
Described brachium pontis one (101) is made of the first rectifier diode (D1), and, the positive pole of described the first rectifier diode (D1) connects the first input end (1) of described rectifier bridge (100), and negative pole connects first output (3) of described rectifier bridge (100);
Described brachium pontis two (102) is made of the second rectifier diode (D2), and, the positive pole of described the second rectifier diode (D2) connects second input (2) of described rectifier bridge (100), and negative pole connects first output (3) of described rectifier bridge (100);
Described brachium pontis three (103) is made of the second monopole type transient voltage suppressor diode (TVS2), and, first input end (the 1) positive pole that the negative pole of described the second monopole type transient voltage suppressor diode (TVS2) connects described rectifier bridge (100) connects second output (4) of described rectifier bridge;
Described brachium pontis four (104) is made of the first monopole type transient voltage suppressor diode (TVS1), and, the negative pole of described the first monopole type transient voltage suppressor diode (TVS1) connects second input (2) of described rectifier bridge (100), and positive pole connects second output (4) of described rectifier bridge.
3. the LED lamp that has anti-lightning and temperature automatically controlled function concurrently as claimed in claim 2 is characterized in that:
This temperature control and current-limiting circuit (200) are comprised of triode (V), semistor (PTC), voltage stabilizing didoe (DW) and biasing resistor (R); And the collector electrode of described triode (V) is connected with first output (3) of described rectifier bridge (100), emitter is connected with an end of described semistor (PTC), base stage is connected with an end of described biasing resistor (R) and the negative pole of described voltage stabilizing didoe (DW); The other end anodal and described semistor (PTC) of described voltage stabilizing didoe (DW) all is connected with the output (5) of this temperature control and current-limiting circuit; The other end of described biasing resistor (R) is connected with first output (3) of described rectifier bridge (100).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220683804 CN202941026U (en) | 2012-12-12 | 2012-12-12 | LED lamp with lightning-stroke resistant and automatic temperature-control function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220683804 CN202941026U (en) | 2012-12-12 | 2012-12-12 | LED lamp with lightning-stroke resistant and automatic temperature-control function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202941026U true CN202941026U (en) | 2013-05-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220683804 Expired - Fee Related CN202941026U (en) | 2012-12-12 | 2012-12-12 | LED lamp with lightning-stroke resistant and automatic temperature-control function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202941026U (en) |
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2012
- 2012-12-12 CN CN 201220683804 patent/CN202941026U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130515 Termination date: 20131212 |