CN102281683B - LED anti-flash circuit - Google Patents

LED anti-flash circuit Download PDF

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Publication number
CN102281683B
CN102281683B CN201110218480.5A CN201110218480A CN102281683B CN 102281683 B CN102281683 B CN 102281683B CN 201110218480 A CN201110218480 A CN 201110218480A CN 102281683 B CN102281683 B CN 102281683B
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module
resistance
effect transistor
type
input
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CN201110218480.5A
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Chinese (zh)
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CN102281683A (en
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吴其志
汪彪
林万炯
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林万炯
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Abstract

The invention relates to an LED anti-flash circuit which comprises an AC/DC module, a DC/DC module, a light-adjusting signal generation circuit, a first capacitor and a second capacitor; wherein the input end of the AC/DC module is connected with the external commercial power, two ends of the first capacitor are respectively connected with two output ends of the main power supply end of the AC/DC module, two ends of the second capacitor are respectively connected with two output ends of the auxiliary power supply end of the AC/DC module, two input ends of the light-adjusting signal generation circuit are respectively connected with two ends of the second capacitor, and the output end of the light-adjusting signal generation circuit is connected with the light-adjusting interface end of the DC/DC module, and the output end of the DC/DC module is connected with the LED load; the circuit is characterized by also comprising an enable circuit which is used for controlling the working mode of the DC/DC module and enforcedly shutting the power supply of the DC/DC module when the input power supply of the AC/DC module is switched off, the input end of the enable circuit is connected at two ends of the first capacitor, and the output end of the enable circuit is connected with the output end of the DC/DC module. Compared with the prior art, the circuit can thoroughly solve the flash phenomenon occurred when the LED power supply is switched off.

Description

A kind of LED anti-flicker circuit

Technical field

The present invention relates to a kind of LED anti-flicker circuit, particularly relate to a kind of adopt the first order be AC/DC module, the second level adopt DC/DC module two-stage dimming power source as LED driving power when input power supply is closed, prevent the circuit of LED flicker.

Background technology

Existing LED light regulating technology mainly divides two classes from the signal generation principle of light modulation: the one, and simulation light modulation, the 2nd, PWM light modulation, the two all needs extra circuit module to go to realize, and this just needs the support of extra power supply circuits.The conventional employing first order is that AC/DC module, the second level adopt in the two-stage dimming power source of DC/DC module, the first order is AC/DC module above, for generation of constant pressure source, this voltage source is as the supply power voltage of DC/DC module, the DC/DC module of the second level, for driving LED, makes it to be operated in constant current state.The power supply of dim signal circuit for generating can directly hang on the constant pressure source of AC/DC module generation, mode by step-down is got, the power supply of the power supply of DC/DC module and dim signal circuit for generating is synchronous like this, just do not have the scintillation of switching on and shutting down, but because there is the dividing potential drop of resistance, unloaded power consumption can be larger like this.Another kind of scheme is to increase auxiliary power supply system in first order AC/DC module, dim signal circuit for generating is powered by auxiliary power supply system, no-load power consumption can reach lower state (<0.5W) like this, but because the Capacity Ratio of the filter capacitor C1 of first order AC/DC module output is larger, more than the large several times of capacity of the filter capacitor C2 of the electric power system of dim signal circuit for generating, once power remove (being that civil power is no longer powered to AC/DC module) like this, the velocity of discharge of C1 is compared just slow with C2, when in little load and light modulation to the darkest time, LED lamp is because electric current is smaller, brightness is just darker, the voltage of output is also lower, this time, C2 discharged into O, the signal of light modulation has not just had, DC/DC module just returns to common mode of operation, now the upper voltage of C1 is still very high, and higher than the minimum supply power voltage of DC/DC chip, LED is breakdown again so, be operated in normal condition, and brightness necessarily than light modulation to the darkest bright, although the time is very of short duration, but when being exactly shutoff, phenomenon can glimmer, or under several, that gives people feels very uncomfortable.

Summary of the invention

Technical problem to be solved by this invention be for above-mentioned prior art provide a kind of adopt the first order be AC/DC module, the second level adopt DC/DC module two-stage dimming power source as LED driving power when input power supply is closed, prevent the LED anti-flicker circuit of LED flicker.

The present invention solves the problems of the technologies described above adopted technical scheme: this LED anti-flicker circuit, comprise AC/DC module, DC/DC module, dim signal produces circuit, the first electric capacity, the second electric capacity, wherein the input of AC/DC module is connected with external civil power, the two ends of the first electric capacity are connected with two outputs of the main feeder ear of AC/DC module respectively, the two ends of the second electric capacity are connected with two outputs of the auxiliary power supply end of AC/DC module respectively, two inputs that dim signal produces circuit are connected with the two ends of the second electric capacity respectively, dim signal produces the output of circuit and the dimming interface end of DC/DC module is connected, the output of DC/DC module is connected with LED load, it is characterized in that: also comprise that one for controlling DC/DC module operating state, and the enable circuits that energy positive closing DC/DC module makes it no longer to work when the input power of AC/DC module turn-offs, the input of this enable circuits is connected to one end of the first electric capacity, the output of this enable circuits is connected with the input of DC/DC module.

Described enable circuits can have multiple structure, wherein a kind ofly be configured to preferably: described enable circuits comprises a P type field effect transistor, a metal-oxide-semiconductor drive circuit and the first resistance, wherein, the first end of the first resistance is connected with the source electrode of P type field effect transistor, the second end of the first resistance is connected with the grid of P type field effect transistor, and for P type field effect transistor, Q1 provides bias voltage; The input of metal-oxide-semiconductor drive circuit is connected with the cathode output end of the auxiliary power supply end of AC/DC module, the output of metal-oxide-semiconductor drive circuit is connected with the grid of P type field effect transistor, the source electrode of P type field effect transistor is connected with the positive pole of the first electric capacity, and the drain electrode of P type field effect transistor is connected with the power input of DC/DC module.

Described metal-oxide-semiconductor drive circuit comprises the second resistance, the 3rd resistance, the 4th resistance and a N-type field effect transistor, wherein the first termination of the second resistance is connected with the grid of P type field effect transistor, the second end of the second resistance is connected with the drain electrode of N-type field effect transistor, the first end of the 3rd resistance and the 4th resistance is all connected with the grid of N-type field effect transistor, the second end ground connection of the 3rd resistance, the cathode output end that the second end of the 4th resistance is the input of metal-oxide-semiconductor drive circuit and the auxiliary power supply end of AC/DC module is connected, the source ground of N-type field effect transistor.

The principle of this scheme is: between the constant pressure source VIN providing by the AC/DC module in the first order and the supply power voltage VCC of DC/DC module, increase switching device, C2 discharge into O or before by the power supply positive closing of DC/DC module.

Another is configured to preferably: described enable circuits comprises a N-type field effect transistor, metal-oxide-semiconductor drive circuit, the 5th resistance and the 6th resistance, wherein the input of metal-oxide-semiconductor drive circuit is connected with the cathode output end of the auxiliary power supply end of AC/DC module, the output of metal-oxide-semiconductor drive circuit is connected with the grid of N-type field effect transistor, the drain electrode of N-type field effect transistor is connected with the positive pole of the first electric capacity after connecting the 5th resistance, ground connection after source electrode connection the 6th resistance of N-type field effect transistor, and the source electrode of N-type field effect transistor is also connected with the ON/OFF pin of DC/DC module; The power input of DC/DC module is connected with the positive pole of the first electric capacity.

Described metal-oxide-semiconductor drive circuit comprises the 7th resistance and the 8th circuit, wherein the first end of the 7th resistance and the 8th resistance is all connected with the grid of N-type field effect transistor, the second end ground connection of the 7th resistance, the cathode output end that the second end of the 8th resistance is the input of metal-oxide-semiconductor drive circuit and the auxiliary power supply end of AC/DC module is connected.

The principle of this scheme is: by DC/DC module itself with ON/OFF function, increase switching device, C2 discharge into 0 or before by DC/DC decapacitation, it is no longer worked.

Compared with prior art, the invention has the advantages that: by the enable circuits that is provided for controlling DC/DC module operating state and can positive closing DC/DC modular power source when the input power of AC/DC module turn-offs, thereby when can thoroughly solve the shutdown of LED power supply, occur the phenomenon of flicker.

Accompanying drawing explanation

Fig. 1 is the circuit theory diagrams of the embodiment of the present invention one.

Fig. 2 is the circuit theory diagrams of the embodiment of the present invention two.

Embodiment

Below in conjunction with accompanying drawing, embodiment is described in further detail the present invention.

Embodiment mono-:

LED anti-flicker circuit shown in Figure 1, comprise AC/DC module, DC/DC module, dim signal produces circuit, the first capacitor C 1, the second capacitor C 2 and for controlling DC/DC module operating state, and the enable circuits of energy positive closing DC/DC modular power source when the input power of AC/DC module turn-offs, wherein the input of AC/DC module is connected with external civil power, the two ends of the first capacitor C 1 respectively with two output VIN+ of the main feeder ear of AC/DC module/-be connected, the two ends of the second capacitor C 2 respectively with two output VCC1+ of the auxiliary power supply end of AC/DC module/-be connected, two inputs that dim signal produces circuit are connected with the two ends of the second capacitor C 2 respectively, dim signal produces the output OUT of circuit and the dimming interface end DIM of DC/DC module is connected, the output of DC/DC module is connected with LED load, the input of described enable circuits is connected to one end of the first capacitor C 1, the output of described enable circuits is connected with the input of DC/DC module.

Described enable circuits comprises a P type field effect transistor Q1 and a metal-oxide-semiconductor drive circuit, and first resistance R 1, wherein the first end of the first resistance R 1 is connected with the source electrode of P type field effect transistor Q1, the second end of the first resistance R 1 is connected with the grid of P type field effect transistor Q1, for P type field effect transistor, Q1 provides bias voltage, the input of metal-oxide-semiconductor drive circuit is connected with the cathode output end VCC1+ of the auxiliary power supply end of AC/DC module, the output of metal-oxide-semiconductor drive circuit is connected with the grid of P type field effect transistor, the source electrode of P type field effect transistor is connected with the positive pole of the first capacitor C 1, the drain electrode of P type field effect transistor is connected with the power input of DC/DC module.

Described metal-oxide-semiconductor drive circuit comprises the second resistance R 2, the 3rd resistance R 3 and the 4th resistance R 4, N-type field effect transistor Q2, wherein the first end of the second resistance R 2 is connected with the grid of P type field effect transistor Q1, the second end of the second resistance R 2 is connected with the drain electrode of N-type field effect transistor Q2, the first end of the 3rd resistance R 3 and the 4th resistance R 4 is all connected with the grid of N-type field effect transistor Q2, the second end ground connection of the 3rd resistance R 3, the cathode output end VCC1+ that the second end of the 4th resistance R 4 is the input of metal-oxide-semiconductor drive circuit and the auxiliary power supply end of AC/DC module is connected, the direct ground connection of source electrode of N-type field effect transistor Q2.

More than the large several times due to Capacity Ratio second capacitor C 2 of the first capacitor C 1, P type field effect transistor Q1 is connected between VIN and VCC, and the voltage of VIN will be higher than VCC1, the energy (1/2CU2) storing in the first capacitor C 1 so will be far longer than the energy storing in the second capacitor C 2, in the time of normal operation, N-type field effect transistor Q2 conducting, the direct ground connection of source electrode due to Q2, the grid of P type field effect transistor Q1 is pulled to ground, because P type field effect transistor is negative pressure conducting, so Q1 conducting in this time, and when mains switch turn-offs, the first capacitor C 1, the second capacitor C 2 starts electric discharge, the velocity of discharge of the second capacitor C 2 will be faster than the first capacitor C 1, when the second capacitor C 2 discharges into a certain degree, this degree is determined by the high level thresholding VOH of the dimming interface end DIM of DC/DC module, the high level voltage that is input to dimming interface end DIM pin when working at ordinary times will be higher than VOH, and between also have certain pressure reduction, when the second capacitor C 2 discharges into VOH or a little more than VOH time, just the level of the output drive of metal-oxide-semiconductor drive circuit should be drawn high, make P type field effect transistor Q1 cut-off, the input terminal voltage VCC of DC/DC module is cut off, even voltage or far above VCCmin (the minimum cut-in voltage that DC/DC module will be worked) in this time first capacitor C 1, but rear class DC/DC circuit is no longer worked, the synchronous when cut-off point of main key point P type field effect transistor Q1 of this scheme and the voltage of the dimming interface end DIM of DC/DC module drop to VOH, when both reach Complete Synchronization, just can thoroughly solve the phenomenon that power remove lamp dodges.

Embodiment bis-:

Different from embodiment mono-is, described enable circuits comprises a N-type field effect transistor Q3, metal-oxide-semiconductor drive circuit, the 5th resistance R 5 and the 6th resistance R 6, wherein the input of metal-oxide-semiconductor drive circuit is connected with the cathode output end in the auxiliary power supply source of AC/DC module, the output of metal-oxide-semiconductor drive circuit is connected with the grid of N-type field effect transistor Q3, the drain electrode of N-type field effect transistor Q3 is connected with the positive pole of the first electric capacity after connecting the 5th resistance R 5, the source electrode of N-type field effect transistor Q3 connects the rear ground connection of the 6th resistance R 6, and the source electrode of N-type field effect transistor is also connected with the ON/OFF pin of DC/DC module, the power input of DC/DC module is connected with the positive pole of the first electric capacity.

Described metal-oxide-semiconductor drive circuit comprises the 7th resistance R 7 and the 8th resistance R 8, wherein the first end of the 7th resistance R 7 and the 8th resistance R 8 is all connected with the grid of N-type field effect transistor Q3, the second end ground connection of the 7th resistance R 7, the cathode output end that the second end of the 8th resistance R 8 is the input of metal-oxide-semiconductor drive circuit and the auxiliary power supply end of AC/DC module is connected.

The same with embodiment mono-, more than the large several times of the Capacity Ratio C2 of the first capacitor C 1, N-type field effect transistor Q3 is for controlling the ON/OFF pin of DC/DC module, when N-type field effect transistor Q3 ends, ON/OFF pin is pulled down to ground by the 6th resistance R 6, DC/DC circuit is just by decapacitation, the technical essential of this scheme is the same with scheme 1, the synchronous when voltage of the dimming interface end DIM of the cut-off point of N-type field effect transistor Q3 and DC/DC module drops to VOH, when both reach Complete Synchronization, just can thoroughly solve the phenomenon that power remove lamp dodges.

Claims (2)

1. a LED anti-flicker circuit, comprise AC/DC module, DC/DC module, dim signal produces circuit, the first electric capacity, the second electric capacity, wherein the input of AC/DC module is connected with external civil power, the two ends of the first electric capacity are connected with two outputs of the main feeder ear of AC/DC module respectively, the two ends of the second electric capacity are connected with two outputs of the auxiliary power supply end of AC/DC module respectively, two inputs that dim signal produces circuit are connected with the two ends of the second electric capacity respectively, dim signal produces the output of circuit and the dimming interface end of DC/DC module is connected, the output of DC/DC module is connected with LED load, it is characterized in that: also comprise that one for controlling DC/DC module operating state, and can positive closing DC/DC modular power source when the input power of AC/DC module turn-offs make it no longer to work enable circuits, the input of this enable circuits is connected to the positive pole of the first electric capacity, the output of this enable circuits is connected with the input of DC/DC module, described enable circuits comprises a P type field effect transistor (Q1), a metal-oxide-semiconductor drive circuit and the first resistance (R1), wherein, the first end of the first resistance (R1) is connected with the source electrode of P type field effect transistor (Q1), and the second end of the first resistance (R1) is connected with the grid of P type field effect transistor (Q1), the input of metal-oxide-semiconductor drive circuit is connected with the cathode output end of the auxiliary power supply end of AC/DC module, the output of metal-oxide-semiconductor drive circuit is connected with the grid of P type field effect transistor, the source electrode of P type field effect transistor is connected with the positive pole of the first electric capacity, and the drain electrode of P type field effect transistor is connected with the power input of DC/DC module, described metal-oxide-semiconductor drive circuit comprises the second resistance (R2), the 3rd resistance (R3), the 4th resistance (R4) and a N-type field effect transistor (Q2), wherein the first end of the second resistance (R2) is connected with the grid of P type field effect transistor (Q1), the second end of the second resistance (R2) is connected with the drain electrode of N-type field effect transistor (Q2), the first end of the 3rd resistance (R3) and the 4th resistance (R4) is all connected with the grid of N-type field effect transistor (Q2), the second end ground connection of the 3rd resistance (R3), the cathode output end that the second end of the 4th resistance (R4) is the input of metal-oxide-semiconductor drive circuit and the auxiliary power supply end of AC/DC module is connected, the source ground of N-type field effect transistor (Q2).
2. a LED anti-flicker circuit, comprise AC/DC module, DC/DC module, dim signal produces circuit, the first electric capacity, the second electric capacity, wherein the input of AC/DC module is connected with external civil power, the two ends of the first electric capacity are connected with two outputs of the main feeder ear of AC/DC module respectively, the two ends of the second electric capacity are connected with two outputs of the auxiliary power supply end of AC/DC module respectively, two inputs that dim signal produces circuit are connected with the two ends of the second electric capacity respectively, dim signal produces the output of circuit and the dimming interface end of DC/DC module is connected, the output of DC/DC module is connected with LED load, it is characterized in that: also comprise that one for controlling DC/DC module operating state, and can positive closing DC/DC modular power source when the input power of AC/DC module turn-offs make it no longer to work enable circuits, the input of this enable circuits is connected to the positive pole of the first electric capacity, the output of this enable circuits is connected with the input of DC/DC module, described enable circuits comprises a N-type field effect transistor (Q3), metal-oxide-semiconductor drive circuit, the 5th resistance (R5) and the 6th resistance (R6), wherein the input of metal-oxide-semiconductor drive circuit is connected with the cathode output end of the auxiliary power supply end of AC/DC module, the output of metal-oxide-semiconductor drive circuit is connected with the grid of N-type field effect transistor (Q3), after the drain electrode of N-type field effect transistor (Q3) connects the 5th resistance, (R5) is connected with the positive pole of the first electric capacity, the source electrode of N-type field effect transistor (Q3) connects the rear ground connection of the 6th resistance (R6), and the source electrode of N-type field effect transistor (Q3) is also connected with the ON/OFF pin of DC/DC module, the power input of DC/DC module is connected with the positive pole of the first electric capacity, described metal-oxide-semiconductor drive circuit comprises the 7th resistance (R7) and the 8th circuit (R8), wherein the first end of the 7th resistance (R7) and the 8th resistance (R8) is all connected with the grid of N-type field effect transistor (Q3), the second end ground connection of the 7th resistance (R7), the cathode output end that the second end of the 8th resistance (R8) is the input of metal-oxide-semiconductor drive circuit and the auxiliary power supply end of AC/DC module is connected.
CN201110218480.5A 2011-07-28 2011-07-28 LED anti-flash circuit CN102281683B (en)

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Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105376896B (en) * 2014-08-18 2018-07-17 赛尔富电子有限公司 A kind of light adjusting circuit and lighting system
CN109195254A (en) * 2018-09-27 2019-01-11 厦门普为光电科技有限公司 A kind of anti-flashing light protection system and method
CN109147704A (en) * 2018-09-28 2019-01-04 合肥鑫晟光电科技有限公司 Shift register cell, gate driving circuit, display device and driving method

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002319498A (en) * 2001-02-13 2002-10-31 Koito Mfg Co Ltd Discharge lamp lighting circuit
CN201757323U (en) * 2010-06-03 2011-03-09 深圳市亮百佳电子科技有限公司 Flicker-free LED MR16 spotlight with dimming function
CN102013820A (en) * 2010-10-22 2011-04-13 凹凸电子(武汉)有限公司 AC-DC converter, method and controller
CN202145692U (en) * 2011-07-28 2012-02-15 林万炯 LED flicker filter circuit

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002319498A (en) * 2001-02-13 2002-10-31 Koito Mfg Co Ltd Discharge lamp lighting circuit
CN201757323U (en) * 2010-06-03 2011-03-09 深圳市亮百佳电子科技有限公司 Flicker-free LED MR16 spotlight with dimming function
CN102013820A (en) * 2010-10-22 2011-04-13 凹凸电子(武汉)有限公司 AC-DC converter, method and controller
CN202145692U (en) * 2011-07-28 2012-02-15 林万炯 LED flicker filter circuit

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