CN101605412A - The LED electrified light emitting circuit - Google Patents

Abstract

The present invention a kind ofly is used to throw light on or LED electrified light emitting circuit that information shows, this circuit is by power supply, LED load and mains switch are formed, the LED load is pressed string by a plurality of LED, and the linked method reasonable combination becomes one-way LED load and amphicheirality LED load, the mains switch that LED electrified light emitting circuit of the present invention adopts is to be produced and control wave (or driving voltage) triggers (or driving) switching device and connects the LED electrified light emitting circuit when the supply voltage zero passage and make the LED electrified light emitting circuit can use the existing 100V～240V in the world by electronic circuit, the mains powered of 50～60Hz and need not use supply convertor makes the cost of LED electrified light emitting circuit product, power consumption and failure rate all reduce.

Description

The LED electrified light emitting circuit

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 the mains supply U of supply convertor with 100～240V, 50～60HZ ₁Be transformed into 24V low-tension supply power supply LED load, Hong Kong is very bright and beautiful on March 4th, the 2008 Guangzhou International exhibition waits the exhibiter to put on display LED street lamp and other LED electrified light emitting products, its operating voltage that is powered at the LED load is low-tension supplies such as 12V, 24V, 2008 2～3 monthly magazines of China's LED monograph have been introduced supply convertor special chip NCP1216, use supply convertor that cost, power consumption and the failure rate of LED electrified light emitting circuit product have all been increased.

Summary of the invention

Task of the present invention provides a kind of direct use mains supply U ₁The LED electrified light emitting circuit of power supply LED load saves cost, power consumption and the failure rate that supply convertor makes LED electrified light emitting circuit product and all reduces.

A kind of LED electrified light emitting circuit comprises: power supply, LED load and mains switch, described power supply are 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 the load in this LED electrified light emitting circuit (abbreviation main circuit), the LED electrified light emitting is used for illumination or display message is widely used, different application scenarios is selected the model of LED for use, quantity is also different, an available N LED forward is connected in series and forms a string N type one-way LED load, or again with two string N type one-way LED loads each other reverse parallel connection connect to form a string 2N type amphicheirality LED load, or with two LED each other reverse parallel connection connect to form the amphicheirality and pipe is got N then the amphicheirality is connected in series to pipe forms a string 2N type amphicheirality LED load, or get Y string 2N type amphicheirality LED load and be connected in parallel and form 2NY type amphicheirality LED load, or also can form other various types of LED loads flexibly, above-mentioned all types of LED load is referred to as the LED load (5) of this LED electrified light emitting circuit, because the rated voltage U of every LED _TWith rated current I _TEtc. parameter discreteness being arranged is inconsistency, presses N * U basically _T＞U ₁Choose the N value, also to 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, between the voltage of LED, the rated value of current parameters and the License Value bigger surplus is arranged, when circuit debugging, choose rational N value easily; Described mains switch is the member in the switch extended familys, switching device is from having only connection, the manual knife switch of the function of turn-offing is to electronic contact switch device such as relay, contactor, to semiconductor power electronic switching device such as thyristor, power transistor, the electric power field effect transistor, develop into the switch of electronic circuit and switching device combination, except having connection, outside the turn-off function, different combinations also has different additional functions, the mains switch of this LED electrified light emitting circuit is the zero-based mains switch by electronic circuit that contains voltage zero-crossing detector or phase shift trigger and switching device combination, produces also control wave (or driving voltage) triggering (or driving) switching device at power supply U by electronic circuit 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 0～25 volt low-voltage, connect U behind the main circuit _LBe intact substantially sine wave,

(1) the zero-based mains switch of input control circuit and zero-based ac solid relay combination: the zero-based ac solid relay is the four-terminal device that two input A, B and two output C, D are arranged, different manufacturers model is different but its internal circuit is similar, it is LED, photoelectricity coupling circuit, voltage zero-crossing detector circuit, circuits for triggering and bidirectional thyristor etc. that input circuit is arranged, 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, D power supply U ₁The triggering signal that the circuits for triggering generation meets the requirements during voltage zero-cross triggers bidirectional thyristor conducting C, the D two ends communicate, a kind of LED electrified light emitting circuit comprises: power supply, LED load and mains switch, described power supply are 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); Described mains switch is that LED load (5) cross-over connection is in power supply U by the zero-based mains switch of input control circuit and zero-based ac solid relay (1) combination ₁L end and the output C of zero-based ac solid relay (1), output D meets power supply U ₁N end, 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, input B connects the negative terminal of DC power supply and forms input control circuit, when turn-offing, K switch do not have input signal, 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 input signal 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)

(2) input control circuit, the zero-based mains switch of photoelectrical coupler and bidirectional thyristor combination: the MOC30 that Motorola Inc. produces * * serial photoelectrical coupler or title photoisolator integrated circuit are six pin devices, 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, a kind of LED electrified light emitting circuit comprises: power supply, LED load and mains switch, described power supply are 100 existing～240V of the world, the mains supply U of 50～60HZ ₁, U ₁Zero, phase line is N end, L end; Described LED load is LED load (5); Described mains switch is that auxiliary circuit comprises current-limiting resistance R by the zero-based mains switch of input control circuit, photoelectrical coupler (2) and bidirectional thyristor VS and auxiliary circuit combination ₂, anti-VS false triggering resistance R ₃And protection VS avoids R, the C absorption circuit of electrical network surge current impact failure, 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 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 connection is in the main electrode T of VS ₁With power supply U ₁N end, the control utmost point G of VS connects the pin 4 of photoelectrical coupler (2), resistance R ₃Cross-over connection is in control utmost point G and the main electrode T of VS ₁, R, C absorb the circuit cross-over connection in the main electrode T of VS ₁And T ₂, when K switch was turn-offed, it is not luminous that photoelectrical coupler (2) importation LED does 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,

(3) the voltage zero-crossing detector circuit of discrete component composition, the zero-based mains switch of photoelectrical coupler and bidirectional thyristor combination: photoelectrical coupler MOC3020～3 are 6 pin devices, importation pin 1, pin 2 is LED, output pin 4, pin 6 is photosensitive bidirectional thyristors, pin 3, pin 5 is left a blank, it is luminous when importation LED flows through the forward trigger current, it is pin 4 that the photosensitive bidirectional thyristor of output is subjected to be conducting state after the rayed, pin 6 communicates, a kind of LED electrified light emitting circuit comprises: power supply, LED load and mains switch, described power supply are 100 existing～240V of the world, the mains supply U of 50～60HZ ₁, U ₁Zero, phase line is N end, L end; Described LED load is LED load (5); 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 and auxiliary circuit combination, auxiliary circuit comprises current-limiting resistance R ₃, photoelectrical coupler (3) R ₄, C ₁The R, the C that absorb circuit and bidirectional thyristor VS absorb circuit, 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 ₃With R ₄Series connection (the serial connection point is F) back cross-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 connection is in the main electrode T of VS ₁With power supply U ₁N end, pin 4 connects the gate pole G of VS, capacitor C ₁Cross-over connection is in the main electrode T of serial connection point F and VS ₁, R, C absorb the circuit cross-over connection in the main electrode T of VS ₁And T ₂, 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 ₄, 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,

(4) the zero-based mains switch of phase shift trigger and bidirectional thyristor combination: KTM03 phase shift trigger module is by pressurizer, synchronous zero-detection circuit, compositions such as comparator, gating circuit, isolation follower, 220VAC/16VAC level of power transformer connects pin 1, the pin 2 of KTM03, 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 ₁Delivering to the conducting of isolation follower triggering photo thyristor in the voltage zero-cross makes pin 8 communicate with pin 7, utilize this working method, the KTM03 phase shift trigger can be combined into the zero-based mains switch with bidirectional thyristor, a kind of LED electrified light emitting circuit comprises: power supply, LED load and mains switch, described power supply are 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); Described mains switch is the zero-based mains switch by phase shift trigger (4) and auxiliary circuit and bidirectional thyristor VS and R, C absorption combination of circuits thereof, the secondary 16VAC of power transformer T (220VAC/16VAC) connects phase shift trigger (4) pin 1, pin 2 (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 connection is in the main electrode T of VS ₁With power supply U ₁N end, the gate pole G pin 7 of VS, R, C absorb the circuit cross-over connection in the main electrode T of VS ₂And T ₁, 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,

(5) the zero-based mains switch of phase shift trigger and relay assembly: electromechanical switch such as relay, contactor, 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 ₀, a kind of LED electrified light emitting circuit comprises: power supply, LED load and mains switch, described power supply are 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); Described mains switch is the zero-based mains switch by phase shift trigger (4) and auxiliary circuit and relay (K) and auxiliary circuit combination thereof, secondary phase shift trigger (4) pin 1, pin 2 (KTM03), the resistance R of connecing of power transformer T (220VAC/16VAC) 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; 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 connection is 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,

(6) the zero-based mains switch of input control circuit and photoelectrical coupler combination: for the low-power LED load, the I of 3041 serial photoelectrical couplers _TSM=1A, thereby can be directly saving bidirectional thyristor VS as the zero-based mains switch of described LED electrified light emitting circuit reduces cost, a kind of LED electrified light emitting circuit comprises: power supply, LED load and mains switch, described power supply are 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); Described mains switch is the zero-based mains switch by input control circuit and photoelectrical coupler (2) combination, 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, and R, C absorb the circuit cross-over connection in the pin 6 and the pin 4 of photoelectrical coupler (2), and pin 6 meets power supply U ₁L end, LED load (5) cross-over connection is 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, 1,2,3,6 four examples are the zero-based mains switches by electronic circuit that contains voltage zero-crossing detector and switching device combination, 4,5 two examples are 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 to produce also control wave (or driving voltage) triggering (or driving) switching device at power supply U by electronic circuit 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), 2, the switching device of 3,4 three examples is 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 (5) example 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, the N working method of promptly described LED electrified light emitting circuit, or be called the LED electrified light emitting circuit of N working method.

(7) a kind of LED electrified light emitting circuit of M working method comprises: power supply, LED load and mains switch, described power supply are the mains supply U of 100 existing～240V of the world, 50～60HZ ₁, U ₁Zero, phase line is N end, L end; Load in the LED electrified light emitting circuit that described LED load is this M working method (abbreviation main circuit), 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, in this case M * U _T＜U ₁This paper abbreviates this situation as M working method that the M working method is the LED electrified light emitting circuit, or be called the LED electrified light emitting circuit of M working method, the composing method of the LED load of M working method is the same with the composing method of the LED load of above-mentioned N working method, the M working method can be formed 2M type amphicheirality LED load, 2MY type amphicheirality LED load or other various types of LED loads also are referred to as the LED load (6) of this LED electrified light emitting circuit, are that the LED electrified light emitting circuit of described M working method also adopts AC capacitor C when adopting the zero-based mains switch for the voltage that every LED is born is no more than way that its voltage permissible value solves _MStep-down, described mains switch are the zero-based mains switches by input control circuit, photoelectrical coupler (2) and bidirectional thyristor VS and auxiliary circuit combination, 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, protection VS R, C absorb circuit and 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 connection is 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, R, C absorb the circuit cross-over connection in the main electrode T of VS ₂And T ₁, when K switch was turn-offed, photoelectrical coupler (2) input LED no current was 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), this routine zero-based mains switch is to have selected (2) routine described zero-based mains switch for use, this routine described zero-based mains switch also can be selected (1) example or (3) example or (4) example or (5) routine described zero-based mains switch, above-mentioned power supply U for use ₁Be 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.

Because this LED electrified light emitting circuit has adopted the zero-based mains switch, can directly use mains supply U ₁Power supply LED load has been saved supply convertor cost, power consumption and the failure rate of LED electrified light emitting circuit product is all reduced.

Description of drawings

The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.

Fig. 1 is that LED electrified light emitting circuit of the present invention adopts the line map by the zero-based mains switch of input control circuit and the combination of zero-based ac solid relay.

Fig. 2 is that LED electrified light emitting circuit of the present invention adopts the line map by the zero-based mains switch of input control circuit, photoelectrical coupler and bidirectional thyristor combination.

Fig. 3 is the line map that LED electrified light emitting circuit of the present invention adopts the zero-based mains switch of voltage zero-crossing detector circuit, photoelectrical coupler and the bidirectional thyristor combination be made up of discrete component.

Fig. 4 is that LED electrified light emitting circuit of the present invention adopts the line map by the zero-based mains switch of phase shift trigger and bidirectional thyristor combination.

Fig. 5 is that LED electrified light emitting circuit of the present invention adopts the line map by the zero-based mains switch of phase shift trigger and relay assembly.

Fig. 6 is that LED electrified light emitting circuit of the present invention adopts the line map by the zero-based mains switch of input control circuit and photoelectrical coupler combination.

Fig. 7 is that LED electrified light emitting circuit of the present invention adopts capacitor step-down and by the line map of the zero-based mains switch of input control circuit, photoelectrical coupler and bidirectional thyristor combination.

Fig. 8 is mains supply U ₁The voltage U that obtains with LED load (5) _LSchematic diagram.

Embodiment

(1) the zero-based mains switch of input control circuit and zero-based ac solid relay combination: the 2nd page of radio 87 years 12 phase, the 29th page of 88 years 5 phase, the 40th page of 01 year 10 phase introduced solid-state relay, the zero-based ac solid relay is that two input A are arranged, B and two output C, the four-terminal device of D, different manufacturers model is different but its internal circuit is similar, it is a LED that input circuit is arranged, the photoelectricity coupling circuit, the voltage zero-crossing detector circuit, circuits for triggering and bidirectional thyristor etc., one of photoelectricity coupling circuit effect is a control signal of transmitting input, two be that input and output are isolated on electric fully, 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, D power supply U ₁The triggering signal that the circuits for triggering generation meets the requirements during voltage zero-cross triggers bidirectional thyristor conducting C, the D two ends communicate, the described a kind of LED electrified light emitting circuit of Fig. 1 (11) comprising: power supply, LED load and mains switch, described power supply are 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); Described mains switch is the zero-based mains switch by the combination of input control circuit and zero-based ac solid relay (1), zero-based ac solid relay (1) select for use one to be that 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, and LED load (5) cross-over connection is in power supply U ₁L end and the output C of zero-based ac solid relay (1), output D meets power supply U ₁N end, 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, when turn-offing, K switch do not have input signal, 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 input signal 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 that K switch is in time T ₁After the connection, U ₁And U _LSchematic diagram see U among Fig. 8 ₁And U _L, 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)

(2) input control circuit, the zero-based mains switch of photoelectrical coupler and bidirectional thyristor combination: China Machine Press publish the 45th page of Motorola's photoelectricity optical fibre device handbook and radio 94 years 4 phase introduced respectively the MOC30 that Motorola Inc. produces * * serial photoelectrical coupler or title photoisolator integrated circuit are six pin devices, 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, maximum is 60mA, can choose any one kind of them from MOC3041 series photoelectrical coupler and semiconductor switch device is combined into the zero-based mains switch, the described a kind of LED electrified light emitting circuit of Fig. 2 (12) comprising: power supply, LED load and mains switch, described power supply are 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); Described mains switch is the zero-based mains switch by input control circuit, photoelectrical coupler (2) and bidirectional thyristor VS and auxiliary circuit 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 ₃And protect VS to avoid R, the C absorption circuit of electrical network surge current impact failure, 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, R=39 Ω, C=0.01 μ F, 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) input 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 connection is in the main electrode T of VS ₁With power supply U ₁N end, the control utmost point G of VS connects the pin 4 of photoelectrical coupler (2), resistance R ₃Cross-over connection is in control utmost point G and the main electrode T of VS ₁, R, C absorb the circuit cross-over connection in the main electrode T of VS ₁And T ₂, when K switch was turn-offed, it is not luminous that photoelectrical coupler (2) importation LED does 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,

(3) the zero-based mains switch of the voltage zero-crossing detector circuit of discrete component composition, photoelectrical coupler and bidirectional thyristor combination: 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, it is luminous when importation LED flows through the forward trigger current, it is that pin 4, pin 6 communicate that the photosensitive bidirectional thyristor of output is subjected to be conducting state after the rayed, and the described a kind of LED electrified light emitting circuit of Fig. 3 (13) comprising: power supply, LED load and mains switch, described power supply are 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); 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 and auxiliary circuit 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, auxiliary circuit comprise current-limiting resistance R ₃, photoelectrical coupler (3) R ₄, C ₁The R, the C that absorb circuit and bidirectional thyristor VS absorb circuit, after the selected MOC3023 model of photoelectrical coupler (3), use recommended parameter with reference to the product of this model of selecting for use and can select R for use ₃=360 Ω, R ₄=470 Ω, R=39 Ω, C ₁=0.05 μ F, C=0.01 μ F, 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 ₃With R ₄Series connection (the serial connection point is F) back cross-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 connection is in the main electrode T of VS ₁With power supply U ₁N end, pin 4 connects the gate pole G of VS, capacitor C ₁Cross-over connection is in the main electrode T of serial connection point F and VS ₁, R, C absorb the circuit cross-over connection in the main electrode T of VS ₁And T ₂, 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 ₄, 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,

(4) the zero-based mains switch of phase shift trigger and bidirectional thyristor combination: 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 389th 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 ₁Delivering to the conducting of isolation follower triggering photo thyristor in the voltage zero-cross makes pin 8 communicate with pin 7, utilize this working method, the KTM03 phase shift trigger can be combined into the zero-based mains switch with bidirectional thyristor, the described a kind of LED electrified light emitting circuit of Fig. 4 (14) comprising: power supply, LED load and mains switch, described power supply are 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); Described mains switch is the zero-based mains switch by phase shift trigger (4) and auxiliary circuit and bidirectional thyristor VS and R, C absorption combination of circuits thereof, 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 phase shift trigger (4) pin 1, pin 2 (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 connection is in the main electrode T of VS ₁With power supply U ₁N end, the gate pole G pin 7 of VS, R, C absorb the circuit cross-over connection in the main electrode T of VS ₂And T ₁, 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,

(6) the zero-based mains switch of input control circuit and photoelectrical coupler combination: 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, thereby can be directly saving bidirectional thyristor VS as the zero-based mains switch of described LED electrified light emitting circuit reduces cost, the described a kind of LED electrified light emitting circuit of Fig. 6 (16) comprising: power supply, LED load and mains switch, described power supply are 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); Described mains switch is the zero-based mains switch by input control circuit and photoelectrical coupler (2) combination, photoelectrical coupler (2) can be selected any of MOC3041 series for use, photoelectrical coupler for other models with MOC3041 series same function also can be selected current-limiting resistance R for use 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) input in K switch has suitable forward trigger current; R, C that protection photoelectrical coupler (2) is avoided electrical network surge current impact failure absorb the circuit cross-over connection in the pin 6 and the pin 4 of photoelectrical coupler (2); 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=470 Ω, C=0.05 μ F for use, pin 6 meets power supply U ₁L end, LED load (5) cross-over connection is 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, 1,2,3,6 four examples are the zero-based mains switches by electronic circuit that contains voltage zero-crossing detector and switching device combination, 4,5 two examples are 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 to produce also control wave (or driving voltage) triggering (or driving) switching device at power supply U by electronic circuit 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), 2, the switching device of 3,4 three examples is 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 (5) example 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, the N working method of promptly described LED electrified light emitting circuit, or be called the LED electrified light emitting circuit of N working method.

(7) the LED electrified light emitting circuit (17) of the described a kind of M working method of Fig. 7 comprises: power supply, LED load, decompression capacitor and mains switch, described power supply are the mains supply U of 100 existing～240V of the world, 50～60HZ ₁, U ₁Zero, phase line is N end, L end; Load in the LED electrified light emitting circuit that described LED load is this M working method (abbreviation main circuit), 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, in this case M * U _T＜U ₁This paper abbreviates this situation as M working method that the M working method is the LED electrified light emitting circuit, or be called the LED electrified light emitting circuit of M working method, the composing method of the LED load of M working method is the same with the composing method of the LED load of above-mentioned N working method, the M working method can be formed 2M type amphicheirality LED load, 2MY type amphicheirality LED load or other various types of LED loads also are referred to as the LED load (6) of this LED electrified light emitting circuit, are that the LED electrified light emitting circuit of described M working method also adopts AC capacitor C when adopting the zero-based mains switch for the voltage that every LED is born is no more than way that its voltage permissible value solves _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 and auxiliary circuit 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, protection VS R, C absorb circuit and 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 connection is 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, R, C absorb the circuit cross-over connection in the main electrode T of VS ₂And T ₁, when K switch was turn-offed, photoelectrical coupler (2) input LED no current was 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) _MThe on state current of main circuit is limited within the suitable operating current of LED load (6), this routine zero-based mains switch is to have selected (2) routine described zero-based mains switch for use, this routine described zero-based mains switch also can be selected (1) example or (3) example or (4) example or (5) routine described zero-based mains switch, above-mentioned power supply U for use ₁Be 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.

Claims (2)

1. LED electrified light emitting circuit, comprising: power supply, LED load and mains switch, described power supply are 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 the load in this LED electrified light emitting circuit (abbreviation main circuit), the LED electrified light emitting is used for illumination or display message is widely used, different application scenarios is selected the model of LED for use, quantity is also different, an available N LED forward is connected in series and forms a string N type one-way LED load, or again with two string N type one-way LED loads each other reverse parallel connection connect to form a string 2N type amphicheirality LED load, or with two LED each other reverse parallel connection connect to form the amphicheirality and pipe is got N then the amphicheirality is connected in series to pipe forms a string 2N type amphicheirality LED load, or get Y string 2N type amphicheirality LED load and be connected in parallel and form 2NY type amphicheirality LED load, or also can form other various types of LED loads flexibly, above-mentioned all types of LED load is referred to as the LED load (5) of this LED electrified light emitting circuit, because the rated voltage U of every LED _TWith rated current I _TEtc. parameter discreteness being arranged is inconsistency, presses N * U basically _T＞U ₁Choose the N value, also to 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, between the voltage of LED, the rated value of current parameters and the License Value bigger surplus is arranged, when circuit debugging, choose rational N value easily; Described mains switch is the member in the switch extended familys, switching device from the manual knife switch of the function having only connection, turn-off to electronic contact switch device such as relay, contactor ... to semiconductor power electronic switching device such as thyristor, power transistor, electric power field effect transistor ... develop into the switch of electronic circuit and switching device combination, except having connection, turn-off function, different combinations also has different additional functions, it is characterized in that:

The mains switch of this LED electrified light emitting circuit is the zero-based mains switch by electronic circuit that contains voltage zero-crossing detector or phase shift trigger and switching device combination, produces also control wave (or driving voltage) triggering (or driving) switching device at power supply U by electronic circuit 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 0～25 volt low-voltage, connect U behind the main circuit _LBe intact substantially sine wave,

(1) the zero-based mains switch of input control circuit and zero-based ac solid relay combination: the zero-based ac solid relay is the four-terminal device that two input A, B and two output C, D are arranged, a kind of LED electrified light emitting circuit comprises: power supply, LED load and mains switch, described power supply are 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); Described mains switch is that LED load (5) cross-over connection is in power supply U by the zero-based mains switch of input control circuit and zero-based ac solid relay (1) combination ₁L end and the output C of zero-based ac solid relay (1), output D meets power supply U ₁N end, 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, input B connects the negative terminal of DC power supply and forms input control circuit, when turn-offing, K switch do not have input signal, 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 input signal 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)

(2) the zero-based mains switch of input control circuit, photoelectrical coupler and bidirectional thyristor combination: MOC30 * * serial photoelectrical coupler or title photoisolator integrated circuit are six pin devices, pin 1, pin 2 are that the importation is a LED, pin 6, pin 4 are that output is the photosensitive bidirectional thyristor that has the voltage zero-crossing detector circuit, pin 3, pin 5 are left a blank, a kind of LED electrified light emitting circuit comprises: power supply, LED load and mains switch, described power supply are 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); Described mains switch is that auxiliary circuit comprises current-limiting resistance R by the zero-based mains switch of input control circuit, photoelectrical coupler (2) and bidirectional thyristor VS and auxiliary circuit combination ₂, anti-VS false triggering resistance R ₃And protection VS avoids R, the C absorption circuit of electrical network surge current impact failure, 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 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 connection is in the main electrode T of VS ₁With power supply U ₁N end, the control utmost point G of VS connects the pin 4 of photoelectrical coupler (2), resistance R ₃Cross-over connection is in control utmost point G and the main electrode T of VS ₁, R, C absorb the circuit cross-over connection in the main electrode T of VS ₁And T ₂, when K switch was turn-offed, it is not luminous that photoelectrical coupler (2) importation LED does 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,

(3) the zero-based mains switch of the voltage zero-crossing detector circuit of discrete component composition, photoelectrical coupler and bidirectional thyristor combination: photoelectrical coupler MOC3020～3 are 6 pin devices, importation pin 1, pin 2 are LED, output pin 4, pin 6 are photosensitive bidirectional thyristors, pin 3, pin 5 are left a blank, a kind of LED electrified light emitting circuit comprises: power supply, LED load and mains switch, described power supply are 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); 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 and auxiliary circuit combination, auxiliary circuit comprises current-limiting resistance R ₃, photoelectrical coupler (3) R ₄, C ₁The R, the C that absorb circuit and bidirectional thyristor VS absorb circuit, 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 ₃With R ₄Series connection (the serial connection point is F) back cross-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 connection is in the main electrode T of VS ₁With power supply U ₁N end, pin 4 connects the gate pole G of VS, capacitor C ₁Cross-over connection is in the main electrode T of serial connection point F and VS ₁, R, C absorb the circuit cross-over connection in the main electrode T of VS ₁And T ₂, 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 ₄, 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,

(4) the zero-based mains switch of phase shift trigger and bidirectional thyristor combination: a kind of LED electrified light emitting circuit comprises: power supply, LED load and mains switch, described power supply are 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); Described mains switch is the zero-based mains switch by phase shift trigger (4) and auxiliary circuit and bidirectional thyristor VS and R, C absorption combination of circuits thereof, the secondary 16VAC of power transformer T (220VAC/16VAC) connects phase shift trigger (4) pin 1, pin 2 (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 connection is in the main electrode T of VS ₁With power supply U ₁N end, the gate pole G pin 7 of VS, R, C absorb the circuit cross-over connection in the main electrode T of VS ₂And T ₁, 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,

(5) the zero-based mains switch of phase shift trigger and relay assembly: electromechanical switch such as relay, contactor, 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, 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, a kind of LED electrified light emitting circuit comprises: power supply, LED load and mains switch, described power supply are 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); Described mains switch is the zero-based mains switch by phase shift trigger (4) and auxiliary circuit and relay (K) and auxiliary circuit combination thereof, secondary phase shift trigger (4) pin 1, pin 2 (KTM03), the resistance R of connecing of power transformer T (220VAC/16VAC) 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; 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 connection is 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,

(6) the zero-based mains switch of input control circuit and photoelectrical coupler combination: for the low-power LED load, the I of 3041 serial photoelectrical couplers _TSM=1A, thereby can be directly saving bidirectional thyristor VS as the zero-based mains switch of described LED electrified light emitting circuit reduces cost, a kind of LED electrified light emitting circuit comprises: power supply, LED load and mains switch, described power supply are 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); Described mains switch is the zero-based mains switch by input control circuit and photoelectrical coupler (2) combination, 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, and R, C absorb the circuit cross-over connection in the pin 6 and the pin 4 of photoelectrical coupler (2), and pin 6 meets power supply U ₁L end, LED load (5) cross-over connection is 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, 1,2,3,6 four examples are the zero-based mains switches by electronic circuit that contains voltage zero-crossing detector and switching device combination, 4,5 two examples are 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 to produce also control wave (or driving voltage) triggering (or driving) switching device at power supply U by electronic circuit 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), 2, the switching device of 3,4 three examples is 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 (5) example 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, the N working method of promptly described LED electrified light emitting circuit, or be called the LED electrified light emitting circuit of N working method.

2. the LED electrified light emitting circuit of a M working method comprises: power supply, LED load and mains switch, described power supply are the mains supply U of 100 existing～240V of the world, 50～60HZ ₁, U ₁Zero, phase line is N end, L end; Load in the LED electrified light emitting circuit that described LED load is this M working method (abbreviation main circuit), 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, in this case M * U _T＜U ₁This paper abbreviates this situation as M working method that the M working method is the LED electrified light emitting circuit, or be called the LED electrified light emitting circuit of M working method, the composing method of the LED load of M working method is the same with the composing method of the LED load of above-mentioned N working method, the M working method can be formed 2M type amphicheirality LED load, 2MY type amphicheirality LED load or other various types of LED loads and be referred to as the LED load (6) of this LED electrified light emitting circuit, the way that is no more than its voltage permissible value solution for the voltage that every LED is born is it is characterized in 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, described mains switch are the zero-based mains switches by input control circuit, photoelectrical coupler (2) and bidirectional thyristor VS and auxiliary circuit combination, 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, protection VS R, C absorb circuit and 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 connection is 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, R, C absorb the circuit cross-over connection in the main electrode T of VS ₂And T ₁, when K switch was turn-offed, photoelectrical coupler (2) input LED no current was 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), this routine zero-based mains switch is to have selected (2) routine described zero-based mains switch for use, this routine described zero-based mains switch also can be selected (1) example or (3) example or (4) example or (5) routine described zero-based mains switch, above-mentioned power supply U for use ₁Be 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.

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