CN101841957A - LED power-on light-emitting circuit - Google Patents
LED power-on light-emitting circuit Download PDFInfo
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- CN101841957A CN101841957A CN201010159017A CN201010159017A CN101841957A CN 101841957 A CN101841957 A CN 101841957A CN 201010159017 A CN201010159017 A CN 201010159017A CN 201010159017 A CN201010159017 A CN 201010159017A CN 101841957 A CN101841957 A CN 101841957A
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Abstract
The invention discloses an LED power-on light-emitting circuit, comprising a power supply, an LED load and a power supply switch. The power supply switch is a zero-crossing type power supply switch, comprising a voltage zero-crossing control circuit and a switch element; the voltage zero-crossing control circuit controls the switch element to switch on the circuit when the voltage of the power supply passes through zero. The voltage zero-crossing circuit of the invention can control the switch element to be connected and switch on the main circuit when the voltage of the power supply passes through zero; and the 24V low-voltage power supply is transformed to supply the electric power for the LED load, thereby the invention reduces the cost, the electricity consumption and the fault rate of the LED power-on light-emitting circuit.
Description
Technical field
The present invention relates to a kind ofly be used to throw light on or LED electrified light emitting circuit that information shows.
Background technology
In the prior art, be used to throw light on or LED electrified light emitting circuit that information shows is to adopt supply convertor that the mains supply of 100～240V, 50～60HZ is transformed into 24V low-tension supply power supply LED load.It should be noted that; supply convertor is when carrying out voltage transformation; can produce a large amount of heat; if the cooling measure of taking is improper; then protectiveness is closed because self temperature is higher than its closing temperature in the converter meeting; thereby cause equipment work malfunctioning easily, particularly need on 24 hours continual circuit this situation more common, and use supply convertor that cost, power consumption and the failure rate of LED electrified light emitting circuit product have all been increased at some.
Summary of the invention
At the shortcoming of prior art, the purpose of this invention is to provide a kind of LED electrified light emitting circuit, can directly use mains supply to give LED electric, reduced the cost of power consumption, failure rate and product.
To achieve these goals, technical scheme of the present invention is: a kind of LED electrified light emitting circuit, comprise power supply, LED load and mains switch, described mains switch is the zero-based mains switch that comprises voltage zero-cross control circuit and switching device, and voltage zero-cross control circuit control switch device is connected circuit when the supply voltage zero passage.
Described zero-based mains switch also comprises input control circuit, and described voltage zero-cross control circuit and switching device combination also are integrated into the zero-based ac solid relay; Described input control circuit provides forward current with the input that the input of described zero-based ac solid relay is connected to this zero-based ac solid relay, and the output of zero-based ac solid relay is connected in parallel with described power supply after also being connected in series with described LED load again.
Described zero-based mains switch also comprises input control circuit, and described switching device is a thyristor, and described voltage zero-cross control circuit is first photoelectrical coupler that has the voltage zero-crossing detector circuit; Described input control circuit is connected to first photoelectrical coupler with the importation of first photoelectrical coupler provides forward current, the triggering passage of described thyristor is connected with the output of first photoelectrical coupler, is connected in parallel with described power supply after the main electrode of described thyristor and described LED load are connected in series again.
Described zero-based mains switch also comprises second photoelectrical coupler, and described switching device is a thyristor, and described voltage zero-cross control circuit mainly is made up of triode, resistance and diode; The output of described triode is connected with the importation of second photoelectrical coupler provides forward current for this second photoelectrical coupler, the triggering passage of described thyristor is connected with the output of second photoelectrical coupler, is connected in parallel with described power supply after the main electrode of described thyristor and described LED load are connected in series again.
Described switching device is a thyristor, and described voltage zero-cross control circuit is a phase shift trigger; The output of described phase shift trigger is connected with the triggering passage of thyristor, is connected in parallel with described power supply after the main electrode of described thyristor and described LED load are connected in series again.
Described switching device is a relay, and described voltage zero-cross control circuit mainly is made up of phase shift trigger and auxiliary circuit; The output of described phase shift trigger and auxiliary circuit is connected with the coil of relay, is connected in parallel with described power supply after two contacts of described relay and described LED load are connected in series again.
Described zero-based mains switch also comprises input control circuit, and described voltage zero-cross control circuit and switching device combination of sets become first photoelectrical coupler that has the voltage zero-crossing detector circuit; Described input control circuit is connected with the importation of first photoelectrical coupler provides forward current, is connected in parallel with described power supply after the output of described first photoelectrical coupler and described LED load are connected in series again.
Described LED electrified light emitting circuit also comprises AC capacitor, is connected in series with LED load, zero-based mains switch after this AC capacitor and power supply are connected in series again.
Compared with prior art, voltage zero-cross control circuit of the present invention, can the control switch device conducting and connect main circuit when the supply voltage zero passage, can directly use mains supply to give LED electric, reduced cost, power consumption and the failure rate of LED electrified light emitting circuit product.
Description of drawings
The present invention is described in further detail below in conjunction with accompanying drawing.
Fig. 1 is the circuit diagram of the embodiment of the invention one.
Fig. 2 is the circuit diagram of the embodiment of the invention two.
Fig. 3 is the circuit diagram of the embodiment of the invention three.
Fig. 4 is the circuit diagram of the embodiment of the invention four.
Fig. 5 is the circuit diagram of the embodiment of the invention five.
Fig. 6 is the circuit diagram of the embodiment of the invention six.
Fig. 7 is the circuit diagram of the embodiment of the invention seven.
Fig. 8 is the present invention uses one-way LED load in the N working method a circuit diagram.
Fig. 9 is the present invention uses one-way LED load in the M working method a circuit diagram.
Embodiment
The voltage zero-cross control circuit of the LED electrified light emitting circuit mains switch of embodiment one and switching device combination also are integrated into the zero-based ac solid relay.See also Fig. 1, the zero-based ac solid relay is that two input A are arranged, B and two output C, the four-terminal device of D, on market, can buy, different manufacturers model is different but its internal circuit is similar, including input circuit is a LED, the photoelectricity coupling circuit, the voltage zero-crossing detector circuit, circuits for triggering and bidirectional thyristor etc., input have control signal be LED the forward trigger current is arranged and in luminous the voltage zero-crossing detector electric circuit inspection to output C, circuits for triggering produce the triggering signal that meets the requirements and trigger bidirectional thyristor conducting C during D power supply U1 voltage zero-cross, the D two ends communicate.Power supply is the mains supply U of 100 existing～240V of the world, 50～60HZ
1, U
1Zero, phase line is N end, L end; The LED load is the load in this LED electrified light emitting circuit (abbreviation main circuit), an available N LED forward is connected in series and forms a string N type one-way LED load, or also can form other various types of LED loads flexibly, be referred to as the LED load 5 of this LED electrified light emitting circuit, because it is inconsistency that parameters such as the rated voltage UT of every LED and rated current IT have discreteness, basically choose the N value by N * UT＞U1, also will make every actual operating voltage of bearing of LED and operating current be no more than the maximum voltage License Value and the maximum current License Value of this LED product regulation.Mains switch is the zero-based mains switch that comprises input control circuit and the combination of zero-based ac solid relay, and 2 points are considered in selecting for use of zero-based ac solid relay 1: the one, and its operating voltage is applicable to power supply U
1, the 2nd, its operating current should can be selected TAC03A220V type zero-based ac solid relay for use greater than the load current of LED load 5, and its operating voltage is 220V, and operating current is 3A; Current-limiting resistance R
1Connect the back cross-over connection in the input A of zero-based ac solid relay 1 and the anode of DC power supply with K switch, and input B connects the negative terminal of DC power supply and forms input control circuit, selects R for use
1The product technology parameter that will satisfy selected zero-based ac solid relay 1 with DC power supply is cut-in voltage and the firing current that its input requires, and is connected in parallel with power supply U1 after output C, the D of zero-based ac solid relay 1 two ends of zero-based mains switch and LED load 5 just is connected in series again.Do not have forward current when K switch is turn-offed, output C, the D of zero-based ac solid relay 1 do not communicate, and K switch is in time T
1The voltage zero-crossing detector electric circuit inspection was to the power supply U of output C, D when the input of zero-based ac solid relay 1 had forward current after connecting
1Circuits for triggering produce the triggering signal meet the requirements and trigger bidirectional thyristor conducting output C, the D connection main circuit that is connected, the voltage U that LED load 5 obtains during voltage zero-cross
LBe intact substantially sine wave, the voltage U that the moment LED load 5 of connection main circuit obtains
LInstantaneous value be 0～25 volt and be called zero passage voltage, connect U behind the main circuit
LInstantaneous value follow power supply U from 0～25 volt
1Sine voltage change U in the time of 5ms
LBe increased to about 310 volts of (U from 0～25 volt
1During for 220V, 50HZ) descend along sine voltage in the time of 5ms again then, as power supply U
1Drop to flow through LED load 5 electric current just main circuit electric current less than bidirectional thyristor keep electric current the time, bidirectional thyristor turn-offs voluntarily, turn-offs main circuit U
L=0 finishes the course of first half-wave, U
LInstantaneous value is exactly power supply U when dropping to zero volt
1Next voltage over zero arrive in, circuits for triggering produce triggering signal again, trigger the bidirectional thyristor conducting and connect main circuit, the voltage U that LED load 5 obtains
LInstantaneous value follow power supply U from 0～25 volt again
1Sine voltage changes the course of finishing second half-wave, half-wave course one by one ... the result is the voltage U that LED load 5 obtains
LBe intact substantially sine wave, but be not the complete sine wave on the mathematical meaning, the voltage U that the moment LED load 5 of connection main circuit obtains
LInstantaneous value be that 0～25 volt low-voltage can not damaged LED load 5 this is crucial, LED is the device that is exceedingly fast, its electrified light emitting response time is less than 0.1us, connects U behind the main circuit
LInstantaneous value be raised to 310 volts high voltage, for LED is to be raised to 310 volts at leisure in the very long time of 5ms, as long as voltage License Value and electric current License Value that reasonable combination LED load 5 makes every actual operating voltage of bearing of LED and operating current be no more than LED product regulation just can not damage LED load 5.
The voltage zero-cross control circuit of the LED electrified light emitting circuit mains switch of embodiment two is the photoelectrical coupler 2 that has the voltage zero-crossing detector circuit.See also Fig. 2, photoelectrical coupler or claim the photoisolator integrated circuit be six pin devices (China Machine Press publish the 45th page of Motorola's photoelectricity optical fibre device handbook and radio 94 years 4 phase introduced the MOC30 that Motorola Inc. produces * * series), pin 1, pin 2 is that the importation is a LED, pin 6, pin 4 is that output is the photosensitive bidirectional thyristor that has the voltage zero-crossing detector circuit, pin 3, pin 5 is left a blank, importation LED launches infrared light when flowing through the forward trigger current of 5～15mA, the photosensitive bidirectional thyristor of output is the just conducting of photosensitive bidirectional thyristor when being subjected to light-struck while voltage zero-crossing detector electric circuit inspection to the supply voltage zero passage of output, it is pin 6, pin 4 communicates, wherein MOC3041～3,3061～3,3081～3 its corresponding V of photoelectrical coupler such as grade (being called for short 3041 series)
DRMBe 400V, 600V, 800V, its I
TSMBe 1A, the forward trigger current of model mantissa 1,2,3 correspondences is 15mA, 10mA, 5mA, and maximum is 60mA, and can choose any one kind of them from MOC3041 series photoelectrical coupler and switching device are combined into the zero-based mains switch; Power supply is the mains supply U of 100 existing～240V of the world, 50～60HZ
1, U
1Zero, phase line is N end, L end; Described LED load is LED load 5; Mains switch is the zero-based mains switch by input control circuit, photoelectrical coupler 2 and bidirectional thyristor VS combination, photoelectrical coupler 2 can be selected any of MOC3041 series photoelectrical coupler for use, have with the photoelectrical coupler of MOC3041 series photoelectrical coupler same function for the various models of other producers and also can select for use, bidirectional thyristor VS selects for use one to be its repetitive peak off state voltage V
DRMShould be greater than 400V, the 2nd, its on state current I
TShould for example can select T2301E for use greater than the load current of LED load 5, its V
DRM=500V, I
T=2.5A or BCR3AM10, its V
DRM=600V, I
T=3A, auxiliary circuit comprise current-limiting resistance R
2, anti-VS false triggering resistance R
3, after the selected MOC3043 model of photoelectrical coupler (2), use recommended parameter with reference to the product of this model of selecting for use and can select R for use
2=27 Ω, R
3=330 Ω, current-limiting resistance R
1Connect the back cross-over connection in the pin 1 of photoelectrical coupler 2 and the anode of DC power supply with K switch, and pin 2 connects the negative terminal of DC power supply, forms input control circuit, resistance R
1To guarantee that with selecting for use of DC power supply connecting back photoelectrical coupler 2 inputs in K switch has suitable forward trigger current, resistance R
2Cross-over connection is in the pin 6 and the power supply U of photoelectrical coupler 2
1L end, the main electrode T of bidirectional thyristor VS
2Meet power supply U
1L end, LED load 5 cross-over connections are in the main electrode T of VS
1With power supply U
1N end, the gate pole G of VS connects the pin 4 of photoelectrical coupler 2, resistance R
3Cross-over connection is in gate pole G and the main electrode T of VS
1, when K switch was turn-offed, it is not luminous that photoelectrical coupler 2 importation LED do not have the forward trigger current, and the photosensitive bidirectional thyristor of output does not have not conducting of rayed, and K switch is in time T
1After the connection, importation LED has the forward trigger current and luminous, and the photosensitive bidirectional thyristor of output is subjected to light-struck while output power supply U
1Photosensitive bidirectional thyristor is conducting state pin 6 and communicates the main electrode T of bidirectional thyristor VS with pin 4 during voltage zero-cross
2Through resistance R
2, pin 6, pin 4 to gate pole G constitutes triggering passage and triggering and conducting is connected main circuit, the voltage U that LED load 5 obtains
LBe intact substantially sine wave, the voltage U that the moment LED load 5 of connection main circuit obtains
LInstantaneous value be 0～25 volt.
The voltage zero-cross control circuit of the LED electrified light emitting circuit mains switch of embodiment three mainly is made up of discrete component triode, resistance and diode.Motorola's photoelectricity optical fibre device handbook has been introduced photoisolator or has been claimed that photoelectrical coupler MOC3020～3 are 6 pin devices, its V
DRM=400V, I
TSM=1A, the forward trigger current of mantissa's 0～3 correspondence is 30mA, 15mA, 10mA, 5mA, importation pin 1, pin 2 are LED, output pin 4, pin 6 are photosensitive bidirectional thyristors, pin 3, pin 5 are left a blank, and be luminous when importation LED flows through the forward trigger current, and it is that pin 4, pin 6 communicate that the photosensitive bidirectional thyristor of output is subjected to be conducting state after the rayed.See also Fig. 3, power supply is the mains supply U of 100 existing～240V of the world, 50～60HZ
1, U
1Zero, phase line is N end, L end; The zero-based mains switch of the voltage zero-crossing detector circuit that described mains switch is made up of discrete component, photoelectrical coupler 3 and bidirectional thyristor VS combination, photoelectrical coupler 3 can be selected in MOC3020～3 any for use, the photoelectrical coupler of various models and also can selecting for use of MOC3020～3 tool said functions that other companies produce, bidirectional thyristor VS selects for use one to be its V
DRMShould be greater than 400V, the 2nd, its on state current I
TShould for example select T2301E for use greater than the load current of LED load 5, its V
DRM=500V, I
T=2.5A after the selected MOC3023 model of photoelectrical coupler (3), uses recommended parameter with reference to the product of this model of selecting for use and can select R for use
3=360 Ω, discrete component diode VD
1～VD
4Connect into A, B, C, D four ends by bridge rectifier, input A, B and 220V, 50HZ power supply U
1Join, the voltage of output C, D is the sine-shaped voltage U of 100 positive half cycles of per second
2, resistance R
1With 3 volts of voltage-stabiliser tube VD
5Connect (the serial connection point is E) back cross-over connection in C, D two ends, U
2Through R
1, VD
5Obtain the approximate trapezoid wave voltage U of 3 volts of amplitudes behind the step-down slicing at serial connection point E
3, the grid G of E point and field effect transistor VT is joined resistance R
2Connect the back cross-over connection in the anode of drain D and the DC power supply of VT with K switch, and the negative terminal of DC power supply and the source S of VT are all joined with the D end of holding as circuit ground, and VT did not have working power when K switch was turn-offed, the current potential of drain D is zero volt, after K switch was connected, VT had working power, the trapezoidal wave voltage U
3The flat part amplitude be 3V, the current potential of VT conducting drain D is less than 0.5 volt, and corresponding to power supply U
1U during voltage zero-cross
3VT ends during less than 0.6 volt, and the current potential of drain D is V
CC, promptly the current potential of drain D is from being upgraded to V less than 0.5 volt
CC, we claim drain D output this moment zero-detection pulse U
4, above-mentioned diode VD
1～VD
5, resistance R
1, R
2, discrete element such as K switch and field effect transistor VT formed power supply U jointly
1The voltage zero-crossing detector circuit is as power supply U
1Output zero-detection pulse U during voltage zero-cross
4, the drain D of VT connects the pin 1 of photoelectrical coupler 3, and pin 2 meets D end, current-limiting resistance R
3Cross-over connection is in pin 6 and power supply U
1L end, the main electrode T of bidirectional thyristor VS
2Meet U
1L end, LED load 5 cross-over connections are in the main electrode T of VS
1With power supply U
1N end, pin 4 meets the gate pole G of VS, when K switch was turn-offed, it was zero volt that VT does not have the working power drain voltage, K switch is in time T
1Connect back VT and working power is arranged, power supply U
1Drain D output zero-detection pulse U during voltage zero-cross
4The importation LED that makes photoelectrical coupler 3 has the forward trigger current and is luminous, and it is that pin 6 communicates with pin 4 that the photosensitive bidirectional thyristor of output is subjected to be conducting state behind the light, the main electrode T of VS
2Through resistance R
3, pin 6, pin 4 to VS gate pole G constitute triggering passage and trigger the VS conducting and connect main circuit, the voltage that LED load 5 obtains is intact substantially sine wave, connects the voltage U that the moment LED load 5 of main circuit obtains
LInstantaneous value be 0～25 volt.
The voltage zero-cross control circuit of the LED electrified light emitting circuit mains switch of embodiment four is a phase shift trigger.China Machine Press publishes power electronic equipment that Li Hong writes and introduces KTM03 phase shift trigger module by pressurizer with the 37th page of device and first the 388th page of integrated circuit application guide and radio 91 years 3 phase, synchronous zero-detection circuit, comparator, gating circuit, isolate compositions such as follower, 220VAC/16VAC level of power transformer connects the pin 1 of KTM03, pin 2, input 16VAC not only done pulse output synchronously but also working power is provided in the module and from pin 3 output+12V 50mA DC power supply for user's action control system usefulness, circuit produces pulse, the gate level V of pin 10 in the KTM03
DPulse is blocked during low level, V
DOutput pulse V is arranged during high level
FSend, change the input voltage V of pin 4
GCan change V
FPhase place, allowing KTM03 work in the no-voltage firing control is to change V
FPhase place make V
FAt power supply U
1Deliver to the conducting of isolation follower triggering photo thyristor in the voltage zero-cross pin 8 is communicated with pin 7, utilize this working method, the KTM03 phase shift trigger can be combined into the zero-based mains switch with bidirectional thyristor.See also Fig. 4, mains switch is the zero-based mains switch by phase shift trigger 4 and auxiliary circuit and bidirectional thyristor VS combination, phase shift trigger 4 is selected the KTM03 phase shift trigger for use, also can select the phase shift trigger of other models of no-voltage firing control for use, bidirectional thyristor VS selects for use one to be its V
DRMShould be greater than 400V, the 2nd, its on state current I
TShould for example can select T2301E for use greater than the load current of LED load 5, its V
DRM=500V, I
T=2.5A or BCR3AM10, its V
DRM=600V, I
T=3A, also available two antiparallel unidirectional thyristors replace bidirectional thyristor, and the secondary 16VAC of power transformer T (220VAC/16VAC) connects pin 1, the pin 2 of phase shift trigger 4 (KTM03), resistance R
1Connect the back cross-over connection in pin 3 and pin 6 with potentiometer RP, the centre cap pin 4 of potentiometer RP, resistance R
2Cross-over connection is in pin 10 and pin 6, and the K switch cross-over connection is in pin 3 and pin 10, current-limiting resistance R
3Cross-over connection is in pin 8 and power supply U
1L end, the main electrode T of bidirectional thyristor VS
2Meet power supply U
1L end, LED load 5 cross-over connections are in the main electrode T of VS
1With power supply U
1N end, the gate pole G pin 7 of VS, transformer T, resistance R
1, R
2, R
3, the auxiliary circuit formed of potentiometer RP and K switch guaranteed the normal operation of phase shift trigger 4, pin 10 gate level V when K switch is turn-offed
DBe zero volt, pulse is blocked, and K switch is in time T
1Connect back V
DFor+12 volts of high level, there is pulse to send, regulator potentiometer RP changes the input voltage V of pin 4
GThereby change output pulse V
FPhase place make the KTM03 phase shift trigger work in the no-voltage firing control, output pulse V
FAt power supply U
1Delivering to the conducting of isolation follower triggering photo thyristor in the voltage zero-cross is that pin 8 communicates the main electrode T of bidirectional thyristor VS with pin 7
2Through resistance R
3, pin 8, pin 7 to gate pole G constitutes triggering passage and triggering and conducting is connected main circuit, the voltage U that LED load 5 obtains
LBe intact substantially sine wave, connect the moment U of main circuit
LInstantaneous value be 0～25 volt.
The voltage zero-cross control circuit of the LED electrified light emitting circuit mains switch of embodiment five is made up of phase shift trigger and auxiliary circuit.Electromechanical switch such as relay, contactor advantage be the on state resistance minor benefit in economize on electricity, its characteristics one are driving voltage U
0At T
11Constantly coil flows through specified operating current and produces electromagnetic force and inhale moving armature and drive contact Ha, Hb on the reed in T behind the input coil
12Adhesive is constantly connected, and contact adhesive T time of delay is arranged
10=T
12-T
11, miniature relay T commonly used
10About about 3ms, characteristics two are requirement driving voltage U
0Be continuous high level rather than pulse, in order to allow contact Ha, Hb at power supply U
1Adhesive is connected and will be allowed driving voltage U during voltage zero-cross
0Than power supply U
1The leading T of voltage over zero
10The moment input coil of time is with compensation contact adhesive T time of delay
10, the phase shift range of the KTM03 phase shift trigger of introducing previously is 0 °～180 °, power supply U
1Time corresponding is 0～10ms during for 50HZ, by changing the input voltage V of KTM03 pin 4
GThereby change pulse V
FPhase place, make V
FCorrespondence is in time than power supply U
1The leading 3ms time of voltage over zero can realize, again with the pulse V of this leading 3ms
FRemove to trigger the bistable circuit of the automatic balancing that powers on, then can obtain the voltage V of a continuous high level at the bistable circuit output
F0, V
F0Forward position and V
FThe forward position synchronous, V
F0Be exactly the driving voltage U that relay coil noted earlier requires
0See also Fig. 5, mains switch is the zero-based mains switch by phase shift trigger 4 and auxiliary circuit and relay K and auxiliary circuit combination thereof, phase shift trigger 4 is selected the KTM03 phase shift trigger for use, all phase shift range time corresponding also can be selected for use greater than other model phase shift triggers of 3ms, and selecting for use of relay K requires its contact rated operational voltage to be applicable to power supply U
1The contact rated operational current should be greater than the load current of LED load 5, if select for use coil rating operating voltage 12V and rated operational current less than 50mA then can from pin 3 outputs of KTM03+the 12V50mA power supply obtains, make circuit reduction, some application scenario for example big screen display screen need be with the LED of big quantity, when using, LED load 5 high-power big electric currents can select for use contactor to replace relay, secondary pin 1, the pin 2 that connects phase shift trigger 4 (KTM03) of power transformer T (220VAC/16VAC), resistance R
1Connect the back cross-over connection in pin 3 and pin 6 with potentiometer RP, the centre cap pin 4 of RP, the K switch cross-over connection is in pin 3 and pin 10, R
2Cross-over connection is the ground end pin 6 of KTM03 in pin 7 and phase shift trigger 4, R
3Cross-over connection is in pin 10 and pin 6, pin 8 pins 10, power transformer T, resistance R
1, R
2, R
3, the auxiliary circuit formed of potentiometer RP and K switch guaranteed the normal operation of phase shift trigger 4, six not gate CD4069 are 14 pin devices, KTM03 phase shift trigger mark pin 1 in the present case, pin 2 ... and CD4069 six not gates marks pin 1, pin 2 ... so that difference, it is pin 10 that pin 14 connects power positive end, pin 7 connects the ground end pin 6 that power supply negative terminal is KTM03, the input of six not gate D1, D2, D3, D4, D5, D6 is a pin 1,3,5,9,11,13, corresponding output is a pin 2,4,6,8,10,12, resistance R
6Cross-over connection is in the pin 4 of D2 and the pin 5 of D3, resistance R
7Cross-over connection is in the pin 6 of D3 and the pin 3 of D2, then resistance R
6, R
7Formed bistable circuit, capacitor C with two not gates of D2, D3
1With resistance R
5Connect (the serial connection point is H) back cross-over connection in pin 10 and pin 6, diode VD
2Anode and the negative terminal cross-over connection in the pin 5 of serial connection point H and D3, C
1, R
5And VD
2Form the automatic zero-set circuit that powers on, diode VD
1Anode and the negative terminal cross-over connection in pin 7 and pin 3 as the triggering passage of output pulses to bistable circuit, resistance R
4Cross-over connection is in the grid G of pin 6 and the field effect transistor VT of D3, the source S pin 6 of VT, and the negative terminal of relay coil K connects the drain D of VT; the anode pin 10 of coil K; the drain D of the positive termination VT of protection diode VD3, VD3 negative terminal pin 10, LED load 5 cross-over connections are in the contact of relay Ha and power supply U
1N end, contact Hb meets power supply U
1L end, resistance R
4, R
5, R
6, R
7, diode VD
1, VD
2, capacitor C
1, the auxiliary circuit formed of not gate D2, D3, field effect transistor VT pulse V that phase shift trigger 4 is sent
FBe transformed to the driving voltage U of the continuous high level that is suitable for the relay requirement
6, the control level V of pin 10 when K switch is turn-offed
D=0V, pulse is blocked, and K switch is connected back V
D=12V high level, bistable electro rood electricity is simultaneously by zero setting, and its output is the current potential U of pin 6
6Less than 0.5V, field effect transistor VT ends, and relay coil K no current contact Ha, Hb are in normally open, and regulator potentiometer RP changes the input voltage V of pin 4
GThereby change output pulse V
FPhase place, make V
FPhase place be that correspondence is in time than power supply U
1The leading T of voltage over zero
10Time, pulse V
FDelivering to the conducting of isolation follower triggering photo thyristor is that pin 8 communicates with pin 7, and pin 3+12V is through K switch, pin 8, pin 7, VD
1Pin 3 triggering bistable circuits to not gate D2 make it upset, and the bistable circuit output is the current potential U of pin 6
6Become U from overturning less than 0.5V
6=12V, U
6Be exactly relay noted earlier require than power supply U
1The leading T of voltage over zero
10The continuous high level voltage U of time
0, U
6Through resistance R
4Drive field effect transistor VT conducting, relay coil K flow through rated operational current through one lag time T
10After just in time be power supply U
1Voltage zero-cross relay contact Ha, Hb adhesive is constantly connected main circuit, the voltage U that the moment LED load 5 of connection main circuit obtains
LInstantaneous value be zero volt, connect U behind the main circuit
LInstantaneous value follow power supply U
1Sine voltage change above-mentioned adjusting V
GThereby change pulse V
FThe easy method intuitively of phase place be the resistance R of working as with the impedance phase of impedance and LED load 5 earlier
LReplace LED load 5 as substituting load, monitor with oscilloscope to substitute load R
LOn voltage U
LWaveform, regulator potentiometer RP makes and is connecting main circuit moment U
LInstantaneous value be zero volt, connect U behind the main circuit
LInstantaneous value follow power supply U
1Sine voltage change, the method is applicable to that also the regulator potentiometer RP of embodiment four makes the KTM03 phase shift trigger work in the no-voltage firing control.
The voltage zero-cross control circuit of the LED electrified light emitting circuit mains switch of embodiment six and switching device make up and become one and be called the photoelectrical coupler 2 that has the voltage zero-crossing detector circuit.LED is the low-power device of economize on electricity, and LED loads in the circuit can not cause impulse current, for the low-power LED load below the 100W, the I of 3041 serial photoelectrical couplers
TSM=1A reduces cost thereby can be directly save bidirectional thyristor VS as the zero-based mains switch of described LED electrified light emitting circuit.See also Fig. 6, mains switch is the zero-based mains switch by input control circuit and photoelectrical coupler 2 combinations, photoelectrical coupler 2 can be selected any of MOC3041 series for use, also can select current-limiting resistance R for use for the photoelectrical coupler of other models with MOC3041 series same function
1Connect the back cross-over connection in the pin 1 of photoelectrical coupler 2 and the anode of DC power supply with K switch, and pin 2 connects the negative terminal of DC power supply, forms input control circuit, resistance R
1Will guarantee that with selecting for use of DC power supply connecting back photoelectrical coupler 2 inputs in K switch has suitable forward trigger current, pin 6 meets power supply U
1L end, LED load 5 cross-over connections are in pin 4 and power supply U
1N end, input LED no current was not luminous when K switch was turn-offed, photosensitive bidirectional thyristor is off state, K switch is in time T
1Connecting back importation LED has the forward trigger current and luminous, and the photosensitive bidirectional thyristor of output is subjected to light-struck while output power supply U
1The conducting pin 6 connection main circuit that communicates with pin 4 during voltage zero-cross, the voltage U that LED load 5 obtains
LBe intact substantially sine wave, connect the moment U of main circuit
LInstantaneous value be 0～25 volt.
In the above-mentioned zero-based mains switch, embodiment one, two, three and six is the zero-based mains switches by electronic circuit that contains voltage zero-crossing detector and switching device combination, embodiment four and five is the zero-based mains switches by electronic circuit that contains phase shift trigger and switching device combination, have discrete component, that integrated circuit is arranged, integrated module is arranged, circuit forms difference but purpose is identical, all is at power supply U by voltage zero-cross control circuit control switch device
1Main circuit is connected in conducting during voltage zero-cross, the voltage U that the moment LED load 5 of connection main circuit obtains
LInstantaneous value be that 0～25 volt low-voltage is called zero passage voltage, can not damage LED load 5, embodiment two, three and four switching device are selected bidirectional thyristor VS commonly used for use, also can select for use two antiparallel unidirectional thyristors to replace bidirectional thyristor VS, if select for use power transistor, electric power field effect transistor ... to do two things when the once-through type switching device, the one, adopt bridge rectifier with power supply U
1Be transformed to 100 (U of per second
1During for 50HZ) the once-through type power supply of positive half cycle is as the power supply of described LED electrified light emitting circuit and adopt one-way LED load, and the 2nd, pulse signal is transformed to the driving voltage U of the synchronous continuous high level of its rising edge and rising edge of a pulse with reference to the have access to electricity bistable circuit of automatic balancing of embodiment five
0, use U
0Drive the conducting of once-through type switching device, N * U is pressed in the LED load 5 in six examples of front basically
T＞U
1Choose the N value, this paper abbreviates this situation as the N working method, it is the N working method of described LED electrified light emitting circuit, or be called the LED electrified light emitting circuit of N working method, for spike, the surge (voltage) that prevents to transmit from power supply causes misoperation even damage to the impact and the interference of zero-based mains switch, can promptly use " R-C " series connection absorption circuit or nonlinear resistance (piezo-resistance) to be connected to power supply U with reference to the circuit practices well
1N, L two ends; because different regions electric network source quality difference; the quality difference of the zero-based power switching devices in the different places of production; the object difference of protection; adopt different ways and connection method; choose suitable way and connection method by the circuit debugging process, above-mentioned power supply U1 is that 100～240V, 50～60HZ are that the mains supply that people habitually practise is for convenience of explanation, the power supply U that LED electrified light emitting circuit in fact of the present invention is suitable for
1Voltage can be lower than that 100V also may be up to 400V, frequency can be lower than 50HZ and also may be up to 400HZ.
See also Fig. 7, the LED technical development is rapid, the luminous power of single LED is increasing, the LED load of small number M LED composition just can be satisfied the general lighting requirement, and the used M value of different occasions is different, M * UT＜U1 in this case, this paper is called the M working method that the M working method is the LED electrified light emitting circuit with this situation, or being called the LED electrified light emitting circuit of M working method, the M working method also can be formed various types of LED loads flexibly and be referred to as the LED load 6 of this LED electrified light emitting circuit.In order to make operating voltage that every LED bears and operating current be no more than way that its voltage License Value and electric current License Value solve is that the LED electrified light emitting circuit of described M working method also adopts AC capacitor C when adopting the zero-based mains switch
MStep-down, C
MStep-down, metering function are arranged, can select CBB type AC capacitor for use, more than the rated voltage 400V, C
MAmount of capacity decide with LED load 6 size of current; Described mains switch is the zero-based mains switch by input control circuit, photoelectrical coupler 2 and bidirectional thyristor VS combination, photoelectrical coupler 2 can be selected any of MOC3041 series photoelectrical coupler for use, other photoelectrical couplers with MOC3041 series said function all can be selected for use, bidirectional thyristor select for use one to be its V
DRMShould be greater than 400V, the 2nd, its on state current I
TShould for example can select T2301E for use greater than the load current of LED load 6, also available two inverse parallel unidirectional thyristors replace bidirectional thyristor VS, current-limiting resistance R
1Connect the back cross-over connection in the pin 1 and the DC power supply anode of photoelectrical coupler 2 with K switch, and pin 2 connects the DC power supply negative terminal, constitutes input control circuit, and auxiliary circuit comprises current-limiting resistance R
2, anti-false triggering resistance R
3, anti-electric shock resistance R
4, resistance R
2With capacitor C
MSeries connection (the serial connection point is A) back cross-over connection is in the pin 6 and the power supply U of photoelectrical coupler 2
1L end, resistance R
4With C
MBe connected in power cutoff U in parallel
1After make C
MThe anti-electric shock of discharge path, the main electrode T of bidirectional thyristor VS
2Meet serial connection point A, LED load 6 cross-over connections are in the main electrode T of VS
1With power supply U
1N end, the gate pole G of VS connects the pin 4 of photoelectrical coupler 2, resistance R
3Cross-over connection is in the main electrode T of VS
1With gate pole G, when K switch was turn-offed, photoelectrical coupler 2 input LED no currents were not luminous, and output pin 6, pin 4 do not communicate, and K switch is in time T
1Connecting back importation LED has the forward trigger current and luminous, and the photosensitive bidirectional thyristor of output is subjected to light-struck while output power supply U
1Photosensitive bidirectional thyristor is conducting state pin 6 and communicates the main electrode T of bidirectional thyristor VS with pin 4 during voltage zero-cross
2Through resistance R
2, pin 6, pin 4 constitute triggering passage and trigger the VS conducting and connect main circuit to gate pole G, connects the voltage U that the moment LED load 6 of main circuit obtains
LInstantaneous value be 0～25 volt of low-voltage, connect power supply U after the main circuit
1Drop on decompression capacitor C
MIn LED load 6, choose C
MThe time should choose the C of suitable capacitance according to the load current size of LED load 6
M, the on state current of main circuit is limited within the suitable operating current of LED load 6.Aforementioned circuit is the improvement of carrying out on the basis of embodiment two, in like manner also can be chosen on the circuit of other embodiment to carry out similar improvement.
See also Fig. 8, use the application of the LED electrified light emitting circuit of one-way LED load in the N working method for the zero-based mains switch: a kind of LED electrified light emitting circuit comprises power supply, LED load and mains switch, and power supply is the mains supply U of 100 existing～240V of the world, 50～60Hz
1, U
1Zero, phase line is N end, L end; The LED load is the one-way LED load 5 in this LED electrified light emitting circuit; Mains switch is the zero-based mains switch, and zero-based ac solid relay 1 input is A, B, and output is C, D, current-limiting resistance R
1Connect the back cross-over connection in the anode of input A and DC power supply with K switch, and input B connects the negative terminal of DC power supply, diode VD
1～VD
4Connect into 1,2,3,4 four ends by bridge rectifier, the input 1,2 of bridge-type meets power supply U
1L end and N hold the voltage U of 3,4 outputs of bridge-type
2Be 100 (U of per second
1During for 50Hz) the once-through type power supply of positive half cycle, the positive termination bridge-type output 3 of LED load (5), the negative terminal of LED load 5 meets the output C of zero-based ac solid relay 1, output D connects the output 4 of bridge-type, when turn-offing, K switch do not have forward current, the C of zero-based ac solid relay 1, D does not communicate, output C when the input of K switch zero-based ac solid relay 1 after time T 1 is connected has forward current, output C during the supply voltage zero passage of D, the D connection main circuit that communicates, the voltage that LED load 5 obtains is the sine wave of 100 positive half cycles of per second, the voltage U that the moment LED load 5 of connection main circuit obtains
LInstantaneous value be 0～25 volt of low-voltage.Aforementioned circuit is the improvement of carrying out on the basis of embodiment one, in like manner also can carry out similar improvement on the circuit of embodiment two to six.
See also Fig. 9, for the zero-based mains switch uses the application of the LED electrified light emitting circuit of one-way LED load, current-limiting resistance R in the M working method
1Connect the back cross-over connection in the input A of zero-based ac solid relay 1 and the anode of DC power supply with K switch, and input B connects the negative terminal of DC power supply, diode VD
1～VD
4Connect into 1,2,3,4 four ends by bridge rectifier, 1,2 is the input of bridge-type, and 3,4 is the output of bridge-type, decompression capacitor C
MWith anti-electric shock resistance R
2Back cross-over connection in parallel is in the input 1 and the power supply U of bridge-type
1L end, the input 2 of bridge-type meets power supply U
1N end, the output 3 of the positive termination bridge-type of LED load 6, the negative terminal of LED load 6 meets the output C of zero-based ac solid relay 1, the output D of zero-based ac solid relay 1 connects the output 4 of bridge-type, the output C, the D that do not have forward current zero-based ac solid relay 1 when K switch is turn-offed do not communicate, and K switch is in time T
1Output C, the D of the zero-based ac solid relay 1 connection main circuit that communicates during the supply voltage zero passage of output C, D when connecting back zero-based ac solid relay 1 forward current is arranged, the voltage that LED load 6 obtains is 100 (U of per second
1During for 50Hz) the intact substantially sine wave of positive half cycle, connect the voltage U that the moment LED load 6 of main circuit obtains
LInstantaneous value be 0～25 volt of low-voltage, connect power supply U behind the main circuit
1Substantially drop on decompression capacitor C
MIn LED load 6.Aforementioned circuit is the application of carrying out on the basis of embodiment one, in like manner also can carry out similar application on the circuit of embodiment two to six.
Claims (8)
1. LED electrified light emitting circuit, comprise power supply, LED load and mains switch, it is characterized in that: described mains switch is the zero-based mains switch that comprises voltage zero-cross control circuit and switching device, and voltage zero-cross control circuit control switch device is connected circuit when the supply voltage zero passage.
2. LED electrified light emitting circuit according to claim 1 is characterized in that: described zero-based mains switch also comprises input control circuit, and described voltage zero-cross control circuit and switching device combination also are integrated into the zero-based ac solid relay; Described input control circuit provides forward current with the input that the input of described zero-based ac solid relay is connected to this zero-based ac solid relay, and the output of zero-based ac solid relay is connected in parallel with described power supply after also being connected in series with described LED load again.
3. LED electrified light emitting circuit according to claim 1, it is characterized in that: described zero-based mains switch also comprises input control circuit, described switching device is a thyristor, and described voltage zero-cross control circuit is first photoelectrical coupler that has the voltage zero-crossing detector circuit; Described input control circuit is connected to first photoelectrical coupler with the importation of first photoelectrical coupler provides forward current, the triggering passage of described thyristor is connected with the output of first photoelectrical coupler, is connected in parallel with described power supply after the main electrode of described thyristor and described LED load are connected in series again.
4. LED electrified light emitting circuit according to claim 1, it is characterized in that: described zero-based mains switch also comprises second photoelectrical coupler, described switching device is a thyristor, and described voltage zero-cross control circuit mainly is made up of triode, resistance and diode; The output of described triode is connected with the importation of second photoelectrical coupler provides forward current for this second photoelectrical coupler, the triggering passage of described thyristor is connected with the output of second photoelectrical coupler, is connected in parallel with described power supply after the main electrode of described thyristor and described LED load are connected in series again.
5. LED electrified light emitting circuit according to claim 1 is characterized in that: described switching device is a thyristor, and described voltage zero-cross control circuit is a phase shift trigger; The output of described phase shift trigger is connected with the triggering passage of thyristor, is connected in parallel with described power supply after the main electrode of described thyristor and described LED load are connected in series again.
6. LED electrified light emitting circuit according to claim 1 is characterized in that: described switching device is a relay, and described voltage zero-cross control circuit mainly is made up of phase shift trigger and auxiliary circuit; The output of described phase shift trigger and auxiliary circuit is connected with the coil of relay, is connected in parallel with described power supply after two contacts of described relay and described LED load are connected in series again.
7. LED electrified light emitting circuit according to claim 1, it is characterized in that: described zero-based mains switch also comprises input control circuit, and described voltage zero-cross control circuit and switching device combination of sets become first photoelectrical coupler that has the voltage zero-crossing detector circuit; Described input control circuit is connected with the importation of first photoelectrical coupler provides forward current, is connected in parallel with described power supply after the output of described first photoelectrical coupler and described LED load are connected in series again.
8. according to the described LED electrified light emitting circuit of the arbitrary claim of claim 1 to 7, it is characterized in that: described LED electrified light emitting circuit also comprises AC capacitor, is connected in series with LED load, zero-based mains switch after this AC capacitor and power supply are connected in series again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010159017A CN101841957A (en) | 2009-07-17 | 2010-03-24 | LED power-on light-emitting circuit |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910041203.4 | 2009-07-17 | ||
| CN201010159017A CN101841957A (en) | 2009-07-17 | 2010-03-24 | LED power-on light-emitting circuit |
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| CN201010159017A Pending CN101841957A (en) | 2009-07-17 | 2010-03-24 | LED power-on light-emitting circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112637991A (en) * | 2019-09-20 | 2021-04-09 | 台达电子工业股份有限公司 | Power supply applied to light emitting diode and operation method thereof |
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| JP2006032033A (en) * | 2004-07-14 | 2006-02-02 | Matsushita Electric Works Ltd | Dimmer |
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