CN102984864B - LED lamp driving power supply with lightning protection and automatic temperature control functions - Google Patents
LED lamp driving power supply with lightning protection and automatic temperature control functions Download PDFInfo
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- CN102984864B CN102984864B CN201210534732.XA CN201210534732A CN102984864B CN 102984864 B CN102984864 B CN 102984864B CN 201210534732 A CN201210534732 A CN 201210534732A CN 102984864 B CN102984864 B CN 102984864B
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Abstract
The invention discloses an LED (light-emitting diode) lamp driving power supply with lightning protection and automatic temperature control functions. The LED lamp driving power supply comprises a voltage reduction capacitor (C1), a rectifier bridge (100), a filter capacitor (C2) and a temperature control and current limiting circuit (200), wherein the rectifier bridge (100) consists of a bridge arm I (101), a bridge arm II (102), a bridge arm III (103) and a bridge arm IV (104); and the temperature control and current limiting circuit (200) consists of a triode (V), a positive temperature coefficient thermistor (PTC), a voltage stabilizing diode (DW) and a biasing resistor (R).
Description
Technical field
The present invention relates to LED lamp field, relate in particular to a kind of " having the LED lamp driving power source 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 LED lamp, rich color, the serial advantage such as controlled, are regarded as: promoting LED lamp, is that the best of light fixture economize on electricity consumption reduction realizes approach by people.Japan estimates: if with LED lamp substitute the incandescent lamp of Japanese half and fluorescent lamp,, equivalence is 6,000,000,000 liters of crude oil of Japan's saving every year! Someone even thinks: LED lamp is the mankind's one of the most great inventions after Edison invented incandescent lamp bulb.
The driving power (being called for short driving power herein) of lamp housing (or claim lampshade), light-emitting diode (Light Emitting Diode) assembly (being called for short LED assembly herein), 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 driving power superior performance, and 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." a kind of multiple constant current high-power LED driving power source " that " LED driving power ", the application number that Chinese Patent Application No. is 201020214658.X's " adjustable LED lamp power driving circuit ", " a kind of LED lamp electric supply system " that application number is 201120309550.3, application number is 200710037934.2 is 201110031371.2 discloses patent applicant's achievement in research separately.
The common feature of above-mentioned public technology is: electronic circuit complexity, electronic devices and components used are too many.
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 LED lamp driving power source of comparatively popular " resistance-capacitance depressurization, rectifier bridge rectification, capacitor filtering " in light fixture market at present:
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 resisting the function of above-mentioned hard pulse, 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.From the operation principle of LED, the PN junction of LED has negative temperature coefficient, that is:, when temperature raises, 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 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 electronic circuit device simple, the used LED lamp driving power source few, that price is tried one's best honest and clean of trying one's best as far as possible;
2, designed LED lamp driving power source has the function of " anti-lightning lightning, anti-electrostatic discharging (ESD), anti-electric fast transition (EFT) " concurrently;
3, designed LED lamp driving power source has the function of " reaching temperature automatically controlled to LED lamp by temperature negative feedback " concurrently;
4, designed LED lamp driving power source 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 driving power source that has anti-lightning and temperature automatically controlled function concurrently, comprise decompression capacitor (C1), rectifier bridge (100), filter capacitor (C2) and temperature control and current-limiting circuit (200) four parts, described rectifier bridge (100) is made up 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 (103) one end separately links together becomes the first input end (1) of described rectifier bridge (100), and described brachium pontis two (102), brachium pontis four (104) one end separately links together becomes second input (2) of described rectifier bridge (100); Described brachium pontis one (101), brachium pontis two (102) other end separately links together becomes first output (3) of described rectifier bridge (100), and described brachium pontis three (103), brachium pontis four (104) other end separately links together becomes second output (4) of described rectifier bridge (100); 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 rectifier bridge (100) described in another termination; First output (3) of the rectifier bridge (100) described in the 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 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).
Load of the present invention is LED assembly, and its anode is connected with described temperature control and the output 5 of current-limiting circuit, and negative terminal is connected with circuit ground.
Described brachium pontis one (101) is made up 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 up 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 of the rectifier bridge (100) described in the negative pole of the second described monopole type transient voltage suppressor diode (TVS2) connects connects second output (4) of described rectifier bridge;
Described brachium pontis four (104) is made up of the first monopole type transient voltage suppressor diode (TVS1), and, the negative pole of the first described 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) composition; And, described triode (
v)collector electrode be connected with first output (3) of described rectifier bridge (100), emitter is connected with one end of described semistor (PTC), the negative pole of one end of base stage and described biasing resistor (R) and described voltage stabilizing didoe (DW) is connected; The other end of the anodal and described semistor (PTC) of described voltage stabilizing didoe (DW) is all 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, in the time that AC voltage is positive half cycle, the first rectifier diode D1 and the equal conducting of the first monopole type transient voltage suppressor diode TVS1, the second rectifier diode D2 and the second monopole type transient voltage suppressor diode TVS2 all end; In the time that AC voltage is negative half period, the first rectifier diode D1 and the first monopole type transient voltage suppressor diode TVS1 all end, the second rectifier diode D2 and the equal conducting of the second monopole type transient voltage suppressor diode TVS2;
In the time that harmful hard pulse of thunderbolt lightning, static discharge or electric fast transition is invaded, between the input 1 of described rectifier bridge, input 2, be equivalent short-circuit condition;
When temperature rise, the temperature automatically controlled program of temperature negative feedback starts, the rising of semistor PTC resistance, and the operating current I0 of LED assembly declines;
When operating current I0 rises, the program of Current Negative Three-Point Capacitance automatic current limiting starts, and the voltage U e5 at thermistor PTC two ends rises, and the voltage U be between base stage and the emitter of triode V declines, and triode V collector current Ic declines;
In the time that AC voltage is positive half cycle, the charging of decompression capacitor C1 positive direction; In the time that AC voltage is negative half period, decompression capacitor C1 is charging in the other direction.
The long operation result (electronic component of the present invention is few, and model machine is easy to do) of theory analysis and experimental prototype all proves that application 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 LED lamp avoid being struck by lightning;
2, because the present invention has the degenerative function of temperature concurrently, so, can make LED lamp realize temperature temperature automatically controlled, prevent that 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 LED lamp realize current-limiting protection.
Brief description of the 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 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, embodiments of the present invention are 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 made up of decompression capacitor C1, rectifier bridge 100, filter capacitor C2, temperature control and current-limiting circuit 200, it is characterized in that: described rectifier bridge 100 is made up 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 one end separately links together becomes the input 1 of described rectifier bridge 100, described brachium pontis 2 102, brachium pontis 4 104 one end separately links together becomes the input 2 of described rectifier bridge 100; Described brachium pontis 1, brachium pontis 2 102 other end separately links together becomes the output 3 of described rectifier bridge 100, and described brachium pontis 3 103, brachium pontis 4 104 other end separately links together becomes the output 4 of described rectifier bridge 100; The output 4 of described rectifier bridge 100 is connected with circuit ground; One end of a termination AC voltage of described decompression capacitor C1 is P1 end, the input 1 of the rectifier bridge 100 described in another termination; The output 3 of the rectifier bridge 100 described in the 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; To be P2 end be connected with the input 2 of described rectifier bridge 100 other end of AC voltage;
In conjunction with Fig. 1, load of the present invention is LED assembly 300 again, and its anode is connected with described temperature control and the output 5 of 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, P2 end can reciprocity.
In conjunction with Fig. 1, Fig. 2, described brachium pontis 1 is made up of the first rectifier diode D1, and the positive pole of the first described 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 up of the second rectifier diode D2, and the positive pole of the second described 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 up 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 up 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 composition; And, described triode
vcollector electrode be connected with the output 3 of described rectifier bridge 100, emitter is connected with one end of described semistor PTC, the negative pole of one end of base stage and described biasing resistor R and described voltage stabilizing didoe DW is connected; The other end of the anodal and described semistor PTC of described voltage stabilizing didoe DW is all 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 described temperature control and the output 5 of 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, while 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, voltage between input 1, the input 2 of described rectifier bridge 100 is u, and u can represent by 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, in the time of normal operating conditions, the amplitude U12 of described voltage u meets 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 the input 1 of rectifier bridge 100 input 2 in high level, rectifier bridge 100 is in the time of 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, all because reverse bias ends, is equivalent to 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 forward bias conducting.Change says it: in the time that AC voltage is positive half cycle and U12 < UB, brachium pontis two all ends with brachium pontis three, brachium pontis one and the equal conducting of brachium pontis four, 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 flows to P2 by P1, the charging process of decompression capacitor C1 claims " positive direction charging ", discharge process to claim " positive direction electric discharge " to the charging of decompression capacitor C1 positive direction; Otherwise claim " charging in the other direction " or " electric discharge in the other direction ")
When AC voltage is negative half period, be voltage u while being the state of the input 1 of rectifier bridge 100 input 2 in low level, rectifier bridge 100 in 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 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, all because reverse bias ends, is equivalent to open circuit.Change says it: in the time that AC voltage is negative half period and U12 < UB, brachium pontis two and the equal conducting of brachium pontis three, brachium pontis one all ends with brachium pontis four, 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 electric discharge in the other direction of decompression capacitor C1 charging in the other direction again.
In sum and in brief: in normal operating conditions, in the time that AC voltage is positive half cycle, brachium pontis two all end with brachium pontis three, brachium pontis one and the equal conducting of brachium pontis four; In the time that 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, in the time that AC voltage is positive half cycle, the charging of decompression capacitor C1 positive direction; In the time that AC voltage is negative half period, decompression capacitor C1 is charging in the other direction.
2, state when harmful hard pulse of thunderbolt lightning, static discharge (ESD) or electric fast transition (EFT) is invaded:
(1) when harmful hard pulse of invading is positive pulse, be that the input 1 of 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, when pulse amplitude V12 > UB between input 2, the first monopole type transient voltage suppressor diode TVS1 in brachium pontis 4 104 is because of forward bias conducting, the second monopole type transient voltage suppressor diode TVS2 in brachium pontis 3 103 is equivalent to short circuit because of reverse breakdown, the i.e. input 1 of described rectifier bridge 100, input impedance → 0 between input 2, be equivalent to short circuit, late-class circuit is just protected and exempts from thunderbolt lightning, the infringement of harmful hard pulse that static discharge or electric fast transition produce,
(2) when harmful hard pulse of invading is negative pulse, be that the input 1 of rectifier bridge 100 is in low level, the state of the input 2 of rectifier bridge 100 in high level, and harmful hard pulse of invading is at described input 2, when pulse amplitude V21 > UB between input 1, the second monopole type transient voltage suppressor diode TVS2 in brachium pontis 3 103 is because of forward bias conducting, the first monopole type transient voltage suppressor diode TVS1 in brachium pontis 4 104 is equivalent to short circuit because of reverse breakdown, the i.e. input 2 of described rectifier bridge 100, input impedance → 0 between input 1, be equivalent to short circuit, late-class circuit is just protected and exempts from thunderbolt lightning, the infringement of harmful hard pulse that static discharge or electric fast transition produce,
In sum and in brief: in the time that harmful positive pulses such as thunderbolt lightning are invaded, described TVS1 is because of forward bias conducting, described TVS2 is equivalent to short circuit because of reverse breakdown; In the time that harmful negative pulse such as thunderbolt lightning etc. is invaded, described TVS2 is because of forward bias conducting, and described TVS1 is equivalent to short circuit because of reverse breakdown.
3, state when temperature raises
From the operation principle of LED, the PN junction of LED has negative temperature coefficient, that is:, when temperature raises, 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 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 resistance that causes semistor PTC is risen in the rising of temperature; The rising of semistor PTC resistance, rises the voltage U e5 that causes its two ends; Because the voltage between base stage and the emitter of triode V is Ube, and:
Ube＝Ub5－Ue5……………………………………………（3）
So the rising of Ue5, will cause the voltage U be between base stage and the emitter of triode V to decline; According to the characteristic of triode, the voltage U be between its base stage and emitter declines, and will cause its collector current Ic to decline; Because the operating current of LED assembly 300 is I0, and:
I0＝Ic＋I1………………………………………………（4）
So the decline of Ic, declines the operating current I0 that causes LED assembly 300; The decline of I0, declines the temperature that causes LED lamp.The present invention has just realized the function of " reaching temperature automatically controlled to LED lamp by temperature negative feedback ".
In above-mentioned (4) formula, I1 is the electric current on biasing resistor R.
Known in sum: the present invention realizes temperature automatically controlled function by following program by temperature negative feedback: the operating current I0 decline-temperature of the voltage U be decline-triode V collector current Ic decline-LED assembly 300 between base stage and the emitter of temperature rise-triode V declines.Briefly: temperature rise-Ube decline-Ic decline-I0 decline-temperature declines.
In brief: when temperature rise, 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 declines.
4, state when operating current I0 rises
In conjunction with Fig. 1, Fig. 2, in the time that operating current I0 rises, the voltage U e5 that causes described thermistor PTC two ends is risen; From (3) formula, the rising of Ue5, will cause the voltage U be between base stage and the emitter of triode V to decline; According to the characteristic of triode, the voltage U be between its base stage and emitter declines, and will cause its collector current Ic to decline; From (4) formula, the decline of Ic, declines the operating current I0 that causes LED assembly 300.The present invention has just realized the function of " reaching the current-limiting protection of LED lamp by Current Negative Three-Point Capacitance ".
Known in sum: the present invention realizes the function of automatic current limiting by Current Negative Three-Point Capacitance by following program: the voltage U be decline-triode V collector current Ic decline-operating current I0 between base stage and the emitter of the voltage U e5 rising-triode V at operating current I0 rising-thermistor PTC two ends declines.Briefly: operating current I0 rising-Ue5 rising-Ube decline-Ic decline-operating current I0 declines.
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 voltage U be between base stage and the emitter of triode V declines, and triode V collector current Ic declines.
The technical characterictic of the present embodiment 1:
1, in normal operating conditions, in the time that AC voltage is positive half cycle, the first rectifier diode D1 and the equal conducting of the first monopole type transient voltage suppressor diode TVS1, the second rectifier diode D2 and the second monopole type transient voltage suppressor diode TVS2 all end; In the time that AC voltage is negative half period, the first rectifier diode D1 and the first monopole type transient voltage suppressor diode TVS1 all end, the second rectifier diode D2 and the equal conducting of the second monopole type transient voltage suppressor diode TVS2;
2,, in the time that harmful hard pulse of thunderbolt lightning, static discharge or electric fast transition is invaded, between the input 1 of described rectifier bridge 100, input 2, be equivalent short-circuit condition;
3,, when temperature rise, the temperature automatically controlled program of temperature negative feedback starts, the rising of semistor PTC resistance, and the operating current I0 of LED assembly 300 declines; ,
4, when operating current I0 rises, the program of Current Negative Three-Point Capacitance automatic current limiting starts, and the voltage U e5 at thermistor PTC two ends rises, and the voltage U be between base stage and the emitter of triode V declines, and triode V collector current Ic declines;
5, in the time that AC voltage is positive half cycle, the charging of decompression capacitor C1 positive direction; In the time that AC voltage is negative half period, decompression capacitor C1 is charging in the other direction.
The decompression capacitor C1 of the present embodiment 1, by its discharge resistance of existing " RC step-down " technical configuration, not it will be apparent to those skilled in the art: the present embodiment 1 is done such design can bring following beneficial effect:
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 LED lamp is started shooting again, decompression capacitor is equivalent to short circuit, and it will be subject to " start is impacted " of AC voltage; The decompression capacitor of the present embodiment 1 is because of nothing corresponding " discharge resistance ", and therefore, after the shutdown of LED lamp, described decompression capacitor C1 is still filled with electric charge, therefore be subject 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 by the brachium pontis in embodiment 1 one, 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 variation designs are afterwards all identical with embodiment 1.
Claims (2)
1. one kind has the LED lamp driving power source of anti-lightning and temperature automatically controlled function concurrently, comprise decompression capacitor (C1), rectifier bridge (100), filter capacitor (C2) and temperature control and current-limiting circuit (200) four parts, it is characterized in that:
Described rectifier bridge (100) is made up 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 (103) one end separately links together becomes the first input end (1) of described rectifier bridge (100), and described brachium pontis two (102), brachium pontis four (104) one end separately links together becomes second input (2) of described rectifier bridge (100); Described brachium pontis one (101), brachium pontis two (102) other end separately links together becomes first output (3) of described rectifier bridge (100), and described brachium pontis three (103), brachium pontis four (104) other end separately links together becomes second output (4) of described rectifier bridge (100); 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 rectifier bridge (100) described in another termination; First output (3) of the rectifier bridge (100) described in the 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 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);
Described brachium pontis one (101) is made up 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 up 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 up of the second monopole type transient voltage suppressor diode (TVS2), and, first input end (the 1) positive pole of the rectifier bridge (100) described in the negative pole of the second described monopole type transient voltage suppressor diode (TVS2) connects connects second output (4) of described rectifier bridge;
Described brachium pontis four (104) is made up of the first monopole type transient voltage suppressor diode (TVS1), and, the negative pole of the first described 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) are made up 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 one end of described semistor (PTC), the negative pole of one end of base stage and described biasing resistor (R) and described voltage stabilizing didoe (DW) is connected; The other end of the anodal and described semistor (PTC) of described voltage stabilizing didoe (DW) is all 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);
Semistor (PTC) in described temperature control and current-limiting circuit (200) connects the positive pole of LED assembly, the negative pole line attachment ground of LED assembly.
2. the LED lamp driving power source that has anti-lightning and temperature automatically controlled function concurrently as claimed in claim 1, is characterized in that:
Described the first and second monopole type transient voltage suppressor diodes (TVS1, TVS2) substitute with piezo-resistance or voltage stabilizing didoe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210534732.XA CN102984864B (en) | 2012-12-12 | 2012-12-12 | LED lamp driving power supply with lightning protection and automatic temperature control functions |
Applications Claiming Priority (1)
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| CN105576951B (en) * | 2016-02-02 | 2017-09-05 | 芜湖锐芯电子科技有限公司 | Current-limiting method and current limliting constant current combined electrical source circuit and its control method |
| CN107422758A (en) * | 2016-05-23 | 2017-12-01 | 扬中市宏彬冷暖设备有限公司 | A kind of water warming blanket main frame potentiometer temperature-control circuit |
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Effective date of registration: 20160302 Address after: The research of Jilin Province Road 130113 Changchun Luyuan Economic Development Zone No. 1999 Patentee after: Changchun Yeal Electrical Appliance Co., Ltd. Address before: 315200 Zhejiang province Zhenhai District of Ningbo City Jiao Chuan Ying Shi Qiao Zhu No. 74 Patentee before: Ningbo Zhenhai Huatai Electric Factory |
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| CP01 | Change in the name or title of a patent holder |
Address after: The research of Jilin Province Road 130113 Changchun Luyuan Economic Development Zone No. 1999 Patentee after: Limited by Share Ltd research Address before: The research of Jilin Province Road 130113 Changchun Luyuan Economic Development Zone No. 1999 Patentee before: Changchun Yeal Electrical Appliance Co., Ltd. |
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| CP01 | Change in the name or title of a patent holder | ||
| CI01 | Correction of invention patent gazette |
Correction item: Patentee|Address Correct: Austrian electric Limited by Share Ltd|The research of Jilin Province Road 130113 Changchun Luyuan Economic Development Zone No. 1999 False: Limited by Share Ltd research|The research of Jilin Province Road 130113 Changchun Luyuan Economic Development Zone No. 1999 Number: 14 Volume: 33 |
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| CI01 | Correction of invention patent gazette |