CN105188208B - A kind of exchange of power-self-stablizing is straight to drive LED methods and the electronic circuit based on it - Google Patents
A kind of exchange of power-self-stablizing is straight to drive LED methods and the electronic circuit based on it Download PDFInfo
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- CN105188208B CN105188208B CN201510554078.2A CN201510554078A CN105188208B CN 105188208 B CN105188208 B CN 105188208B CN 201510554078 A CN201510554078 A CN 201510554078A CN 105188208 B CN105188208 B CN 105188208B
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Abstract
The present invention provides a kind of straight drive LED methods and the electronic circuit based on it of exchange of power-self-stablizing；Electronic circuit includes full-wave rectifying circuit, the LED load sub-circuit of series aiding connection, the voltage-controlled pulse-width modulation circuit of civil power, switch control and constant-current circuit.Its key technology is to carry out the straight power for driving LED load of automatic stabilisation exchange using pulse duration modulation method, while controlling the pulsewidth of modulated signal using the size of input AC line voltage.Beneficial technique effect：The present invention can not only make exchange directly drive the power stability of LED load, and with driving power supply efficiency high, low temperature rise, low cost, high reliability.
Description
Technical field
The invention belongs to electronic applications, and in particular to LED methods and its electronic circuit are directly driven in a kind of exchange of power-self-stablizing.
Background technology
LED has energy-efficient outstanding advantages as luminescent device of new generation, constantly replaces conventional lighting technology
And extensive use.LED chip and LED drive circuit are two key technologies of LED illumination.LED technology is driven with Switching Power Supply
Compare, exchange is straight to drive LED technology has the advantages that reliability high, low cost, small volume and increasingly extensive application.But for
With the presence of the straight rising for driving one important technical problem of LED technology, i.e. power output with input AC line voltage of exchange
And too fast rising, drive circuit is unreliable.Mainly stablize the driving power of LED using active load in prior art.
The technology has a certain effect, but it have obvious technical problem be its active load dissipated power is big, poor reliability,
The efficiency of driving power supply is low.
The content of the invention
For the straight above-mentioned deficiency for driving LED technology of existing exchange, the present invention provides a kind of exchange of power-self-stablizing and directly drives LED
Method and its electronic circuit.
The present invention is that LED methods are directly driven in a kind of exchange of the voltage-controlled pulsewidth modulation power-self-stablizing of civil power, and the technology can make friendship
Stream is straight to drive the power stability of LED load, while there is low driving power supply efficiency high, temperature rise, low cost, high reliability,
With good social and economic benefit.
LED methods are directly driven in a kind of exchange of power-self-stablizing, are to exchange straight drive LED load come automatic stabilisation with pulsewidth modulation
Power.The pulsewidth of the pulse signal of the pulsewidth modulation is controlled by the size of ac commercial power voltage, i.e. this exchange is directly driven
LED methods are a kind of voltage-controlled pulse duration modulation methods of civil power.
The straight electronic circuit for driving LED methods of exchange based on power-self-stablizing of the present invention, by full-wave rectifying circuit U1, together
Constituted to the LED load sub-circuit U2 of series connection, the voltage-controlled pulse-width modulation circuit U3 of civil power, switch control and constant-current circuit U4.Wherein,
Full-wave rectifying circuit U1 is responsible for for alternating voltage being converted to pulse dc high voltage.Full-wave rectifying circuit U1 includes two
Input and two output ends, two output ends of full-wave rectifying circuit U1 are designated as full-wave rectification pulsation high pressure VH ends and ginseng successively
Examine ground GND ends.
The LED load sub-circuit U2 of series aiding connection is responsible for for the LED series aiding connections formation of multiple operating on low voltage can be used for arteries and veins
The LED load sub-circuit of dynamic high drive.The LED load sub-circuit U2 of series aiding connection includes anode and negative terminal.
The voltage-controlled pulse-width modulation circuit U3 of civil power is responsible for being a kind of pulse-width modulation circuit that the pulsewidth of its modulated signal is by exchanging
The size of line voltage is controlled.Switch control and constant-current circuit U4 be responsible for LED load sub-circuit carry out switch control and
The size of operating current is controlled.The voltage-controlled pulse-width modulation circuit U3 of civil power, switch control and constant-current circuit U4 include one respectively
Individual input and an output end.
The full-wave rectification pulsation high pressure VH ends of full-wave rectifying circuit U1 are respectively with the LED load sub-circuit U2's of series aiding connection
The input of the voltage-controlled pulse-width modulation circuit U3 of anode, civil power is connected.
The output end of the voltage-controlled pulse-width modulation circuit U3 of civil power goes out end and is connected with the input of constant-current circuit U4.
The output end of constant-current circuit U4 is connected with the negative terminal of the LED load sub-circuit U2 of series aiding connection.
The positive effect of the present invention is
The present invention is that LED methods are directly driven in a kind of exchange of the voltage-controlled pulsewidth modulation power-self-stablizing of civil power, and the technology not only can be with
Exchange is set directly to drive the power stability of LED, and with driving power supply efficiency high, low temperature rise, low cost, high reliability,
With good social and economic benefit.
Brief description of the drawings
Fig. 1 is theory diagram of the invention.
Fig. 2 as Fig. 1 a kind of circuit legend.
Specific embodiment
Below in conjunction with the accompanying drawings, the invention will be further described.
Referring to Fig. 1, LED methods are directly driven in a kind of exchange of power-self-stablizing, are to exchange straight drive come automatic stabilisation with pulsewidth modulation
The power of LED load.The pulsewidth of the pulse signal of the pulsewidth modulation is controlled by the size of ac commercial power voltage, i.e., originally
The straight LED methods of driving of exchange are a kind of voltage-controlled pulse duration modulation methods of civil power.
Furtherly, this directly drives LED methods by electronic circuit using the exchange of the power-self-stablizing of the voltage-controlled pulsewidth modulation of civil power
Or the mode of integrated circuit is realized.
Furtherly, this directly drives LED methods suitable for LED points using the exchange of the power-self-stablizing of the voltage-controlled pulsewidth modulation of civil power
LED circuit is directly driven in the exchange of level control.
Referring to Fig. 1, furtherly, the straight electronic circuit for driving LED methods of exchange based on power-self-stablizing of the present invention：By
Full-wave rectifying circuit U1, the LED load sub-circuit U2 of series aiding connection, the voltage-controlled pulse-width modulation circuit U3 of civil power, switch control and perseverance
Current circuit U4 is constituted.Wherein,
Full-wave rectifying circuit U1 is responsible for for alternating voltage being converted to pulse dc high voltage.Full-wave rectifying circuit U1 includes two
Input and two output ends, two output ends of full-wave rectifying circuit U1 are designated as full-wave rectification pulsation high pressure VH ends and ginseng successively
Examine ground GND ends.
The LED load sub-circuit U2 of series aiding connection is responsible for for the LED series aiding connections formation of multiple operating on low voltage can be used for arteries and veins
The LED load sub-circuit of dynamic high drive.The LED load sub-circuit U2 of series aiding connection includes anode and negative terminal.
The voltage-controlled pulse-width modulation circuit U3 of civil power is responsible for being a kind of pulse-width modulation circuit that the pulsewidth of its modulated signal is by exchanging
The size of line voltage is controlled.Switch control and constant-current circuit U4 be responsible for LED load sub-circuit carry out switch control and
The size of operating current is controlled.The voltage-controlled pulse-width modulation circuit U3 of civil power, switch control and constant-current circuit U4 include one respectively
Individual input and an output end.
The full-wave rectification pulsation high pressure VH ends of full-wave rectifying circuit U1 are respectively with the LED load sub-circuit U2's of series aiding connection
The input of the voltage-controlled pulse-width modulation circuit U3 of anode, civil power is connected.
The output end of the voltage-controlled pulse-width modulation circuit U3 of civil power goes out end and is connected with the input of constant-current circuit U4.
The output end of constant-current circuit U4 is connected with the negative terminal of the LED load sub-circuit U2 of series aiding connection.
Furtherly, full-wave rectifying circuit U1 is a rectifier bridge device.
Referring to Fig. 2, furtherly, two inputs of full-wave rectifying circuit U1 are connected with L, N line of electric main respectively.
The reference ground GND ends ground connection of full-wave rectifying circuit U1.
Referring to Fig. 2, furtherly, the LED load sub-circuit U2 of series aiding connection is made up of N number of LED of series aiding connection.It is described
N number of LED be designated as successively LED1, LED2, LED3, LED4 ..., LEDN（N is not less than 10）.
Referring to Fig. 2, furtherly, the voltage-controlled pulse-width modulation circuit U3 of civil power is adjusted by line voltage sample circuit and voltage-controlled pulsewidth
Circuit two parts processed are constituted.
Wherein, line voltage sample circuit, is responsible for for the size of high pressure of pulsing carrying out partial pressure sampling and phase shift.It is described
Line voltage sample circuit is made up of bleeder circuit and phase-shift circuit.The bleeder circuit is made up of resistance R1 and resistance R2.Electricity
Resistance R1, resistance R2 and electric capacity C1 collectively form phase-shift circuit.
Voltage-controlled pulse-width modulation circuit, is responsible for realizing the generation of voltage-controlled pulse-width signal.The voltage-controlled pulse-width modulation circuit
By mu balanced circuit and compare amplifying circuit and constitute.The mu balanced circuit is made up of resistance R3, transistor T1 and electric capacity C2.Compare and put
Big circuit by transistor T2, transistor T3, resistance R4, resistance R5, resistance R6, resistance R7, resistance R8, resistance R9, resistance R10 and
Electric capacity C3 is constituted.
Referring to Fig. 2, furtherly, the voltage-controlled pulse-width modulation circuit of civil power is by 10 resistance, 3 electric capacity and 4 transistor structures
Into.10 resistance of note be followed successively by resistance R1, resistance R2, resistance R3 ..., resistance R10.3 electric capacity are followed successively by electric capacity C1, electric capacity
C2, electric capacity C3.4 transistors are followed successively by transistor T1, transistor T2, transistor T3, transistor T4.Wherein,
One end of resistance R1 one end respectively with electric capacity C1, one end of resistance R2, the base stage of transistor T2 link together.
The other end of resistance R1 links together with one end of resistance R3.
The other end of resistance R3 emitter stage, one end of electric capacity C2, one end of resistance R4, resistance R8 respectively with transistor T1
One end, one end of resistance R10 links together.
The other end of resistance R4 one end respectively with resistance R5, one end of resistance R6 link together.Resistance R5's is another
End links together with the emitter stage of transistor T2.The other end of resistance R6 links together with the emitter stage of transistor T3.
The other end of the base stage of transistor T3 and resistance R8, one end of resistance R9, one end of electric capacity C3 link together.
The colelctor electrode of transistor T3 links together with one end of resistance R7, the base stage of transistor T4.
The other end of resistance R10 links together with the colelctor electrode of transistor T4.
The other end of electric capacity C1, the other end of resistance R2, the colelctor electrode of transistor T1 and base stage, the other end of electric capacity C2,
The colelctor electrode of transistor T2, the other end of resistance R7, the other end of resistance R9, the other end of electric capacity C3, the transmitting of transistor T4
Extremely it is grounded.
The tie point of resistance R1 and resistance R3 is the input of the voltage-controlled pulse-width modulation circuit U3 of civil power, resistance R10 and crystal
The tie point of pipe T4 is the output end of the voltage-controlled pulse-width modulation circuit U3 of civil power.
Referring to Fig. 2, furtherly, switch control and constant-current circuit U4 are by transistor T5, transistor T6, resistance R11 and electricity
Resistance R12 compositions.Wherein, the base stage of transistor T5 is connected with one end of resistance R11.The colelctor electrode of transistor T5 is with transistor T6's
Grid is connected.The source electrode of the transistor T6 other end respectively with R11, one end of resistance R12 are connected.The other end of resistance R12, crystalline substance
The transmitting of body pipe T5 is grounded respectively.
The tie point of transistor T5 and transistor T6 is the input of switch control and constant-current circuit U4, the leakage of transistor T6
Extremely switch controls the output end with constant-current circuit U4.
Referring to Fig. 2, furtherly, the model DB157S of full-wave rectification bridge U1.1 ~ LEDN of LED (N=
88) electric current is 350mA, forward voltage 3.2V.Resistance R1=300K Ω, R2=10K Ω, R3=100K Ω, R4=10K Ω, R5=R6
=1KΩ、R7=R8=R9=10KΩ、R10=51KΩ、R11=1KΩ、R12=2Ω.Electric capacity C1=C2=C3=1 μ F/25V.T1, T4 and
T5 is NPN transistor, model 9018.T2 and T3 is PNP transistor, model 9012.T6 is MOS transistor, model
3N80。
As shown in Fig. 2 to the electric main of 50Hz frequencies, it drives the frequency F=100Hz of the pulsation high pressure of LED, cycle T
=10ms, the frequency FP=100Hz of pulse-width signal, the pulsewidth TC of modulated signal is controlled by input line voltage V, works as V=
TC=0ms during 220Vac, as V=240Vac, TC is about 2ms, and as V=265Vac, TC is about 5ms.
As shown in figure 1, its LED driving powers P is with the relation of input line voltage V：
P=50W during V=200Vac；
P=54W during V=220Vac；
P=53W during V=240Vac；
P=52W during V=265Vac.
The present invention is applicable not only to the electric main of 220Vac/50Hz, is also applied for the different exchange such as 110Vac/60Hz
Civil power.
Claims (1)
1. the electronic circuit of LED is directly driven in the exchange of a kind of power-self-stablizing,
It is characterized in that：By full-wave rectifying circuit U1, the LED load sub-circuit U2 of series aiding connection, the voltage-controlled pulsewidth modulation electricity of civil power
Road U3, switch control and constant-current circuit U4 compositions；
Two inputs of the full-wave rectifying circuit U1 are connected with L, N line of electric main respectively；Full-wave rectifying circuit U1's
Reference ground GND ends are grounded；
The LED load sub-circuit U2 of the series aiding connection is made up of N number of LED of series aiding connection；N number of LED is designated as successively
LED1、LED2、LED3、LED4、……、LEDN；
The voltage-controlled pulse-width modulation circuit of civil power is made up of 10 resistance, 3 electric capacity and 4 transistors；10 resistance of note are successively
For resistance R1, resistance R2, resistance R3 ..., resistance R10；3 electric capacity are followed successively by electric capacity C1, electric capacity C2, electric capacity C3；4 crystal
Pipe is followed successively by transistor T1, transistor T2, transistor T3, transistor T4；Wherein,
One end of resistance R1 one end respectively with electric capacity C1, one end of resistance R2, the base stage of transistor T2 link together；
The other end of resistance R1 links together with one end of resistance R3；
The other end of resistance R3 emitter stage, one end of electric capacity C2, one end of resistance R4, the one of resistance R8 respectively with transistor T1
End, one end of resistance R10 link together；
The other end of resistance R4 one end respectively with resistance R5, one end of resistance R6 link together；The other end of resistance R5 with
The emitter stage of transistor T2 links together；The other end of resistance R6 links together with the emitter stage of transistor T3；
The other end of the base stage of transistor T3 and resistance R8, one end of resistance R9, one end of electric capacity C3 link together；
The colelctor electrode of transistor T3 links together with one end of resistance R7, the base stage of transistor T4；
The other end of resistance R10 links together with the colelctor electrode of transistor T4；
The other end of electric capacity C1, the other end of resistance R2, the colelctor electrode of transistor T1 and base stage, the other end of electric capacity C2, crystal
The colelctor electrode of pipe T2, the other end of resistance R7, the other end of resistance R9, the other end of electric capacity C3, transistor T4 emitter stage it is equal
Ground connection；
The tie point of resistance R1 and resistance R3 is the input of the voltage-controlled pulse-width modulation circuit U3 of civil power, resistance R10 and transistor T4
Tie point for the voltage-controlled pulse-width modulation circuit U3 of civil power output end；
The voltage-controlled pulse-width modulation circuit U3 of civil power is made up of line voltage sample circuit and voltage-controlled pulse-width modulation circuit two parts；
Wherein, line voltage sample circuit, is responsible for for the size of high pressure of pulsing carrying out partial pressure sampling and phase shift；The line voltage
Sample circuit is made up of bleeder circuit and phase-shift circuit；The bleeder circuit is made up of resistance R1 and resistance R2；Resistance R1, resistance
R2 and electric capacity C1 collectively form phase-shift circuit；
The voltage-controlled pulse-width modulation circuit, is responsible for realizing the generation of voltage-controlled pulse-width signal；The voltage-controlled pulse-width modulation circuit
By mu balanced circuit and compare amplifying circuit and constitute；The mu balanced circuit is made up of resistance R3, transistor T1 and electric capacity C2；Compare and put
Big circuit by transistor T2, transistor T3, resistance R4, resistance R5, resistance R6, resistance R7, resistance R8, resistance R9, resistance R10 and
Electric capacity C3 is constituted；
Full-wave rectifying circuit U1 is responsible for for alternating voltage being converted to pulse dc high voltage；Full-wave rectifying circuit U1 includes two inputs
End and two output ends, two output ends of full-wave rectifying circuit U1 are designated as full-wave rectification pulsation high pressure VH ends and reference ground successively
GND ends；
The LED load sub-circuit U2 of series aiding connection is responsible for for the LED series aiding connections formation of multiple operating on low voltage can be used for height of pulsing
Press the LED load sub-circuit for driving；The LED load sub-circuit U2 of series aiding connection includes anode and negative terminal；
The voltage-controlled pulse-width modulation circuit U3 of civil power is a kind of pulse-width modulation circuit, and the pulsewidth of its modulated signal is by ac commercial power voltage
Size control；Switch control and constant-current circuit U4 are responsible for that LED load sub-circuit is carried out to switch control and operating current
Size be controlled；The voltage-controlled pulse-width modulation circuit U3 of civil power, switch control and constant-current circuit U4 include an input respectively
With an output end；
The full-wave rectification pulsation high pressure VH ends of full-wave rectifying circuit U1 are respectively with the LED load sub-circuit U2 of series aiding connection just
End, the input of the voltage-controlled pulse-width modulation circuit U3 of civil power are connected；
The output end of the voltage-controlled pulse-width modulation circuit U3 of civil power goes out end and is connected with the input of constant-current circuit U4；
The output end of constant-current circuit U4 is connected with the negative terminal of the LED load sub-circuit U2 of series aiding connection；
The straight electronic circuit for driving LED of exchange of the power-self-stablizing is realized to be exchanged come automatic stabilisation with pulsewidth modulation and directly drives LED
The power of load；The pulsewidth of the pulse signal of the pulsewidth modulation is controlled by the size of ac commercial power voltage.
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