CN102984851B - Light-emitting diode (LED) pulsation driving frequency improving circuit - Google Patents
Light-emitting diode (LED) pulsation driving frequency improving circuit Download PDFInfo
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- CN102984851B CN102984851B CN201210372297.5A CN201210372297A CN102984851B CN 102984851 B CN102984851 B CN 102984851B CN 201210372297 A CN201210372297 A CN 201210372297A CN 102984851 B CN102984851 B CN 102984851B
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Abstract
A light-emitting diode (LED) pulsation driving frequency improving circuit comprises a bridge rectifier, a first switch module with voltage detecting and current limiting functions, a second switch module with voltage detecting and current limiting functions, a switch module with a voltage detecting function, a one-way switch, a first LED lamp group and a second LED lamp group. A positive pole of the bridge rectifier is respectively connected with the first switch module with voltage detecting and current limiting functions and the second switch module with voltage detecting and current limiting functions and is further connected with the switch module with the voltage detecting function, and a negative pole of the bridge rectifier is grounded. The LED pulsation driving frequency improving circuit can enable lighting frequency to be improved to 400Hz or higher than 400Hz.
Description
[technical field]
The invention belongs to field of lighting devices, be specifically related to a kind of LED pulsation driving frequency and promote circuit.
[background technology]
Current LED drive power, substantially based on Switching Power Supply, adopts constant-current dc to drive.But exchange Driving technique constantly progress recently, significantly reduce driving power cost.Exchanging in driving is more carry out current drives to LED after AC rectification being become pulsating direct current, the problem done like this is the frequency of LED luminescence is 100/120Hz, although human eye cannot feel flicker, there will be the picture filaments of sun when picture pick-up device uses and roll and flicker.
As shown in Figure 1, be that power circuit is driven in the interchange of prior art.In Fig. 1, AC is that 220V exchanges, and after bridge rectifier, export the pulsating voltage Vin+ of 100HZ, negative pole is Vin-.The input of Vin+ and flow restricter CL20 is connected to C point, and be connected with the threshold circuit input C1 ~ C35 of LED module, C point simultaneously in the control end base stage of first resistance R1 ~ R35 of each module and first switch Q1-1 ~ Q1-35 of each module and each module the input collector electrode of second switch Q2-1 ~ Q2-35 be connected; The input collector electrode of first switch Q1-1 ~ Q1-35 is connected with the input of LED group in each module, and the output emitter of first switch Q1-1 ~ Q1-35 is connected with the output of the LED group in the output emitter of second switch Q2-1 ~ Q2-35 and each module; The LED group input of Ni group is connected with the LED output of Ni-1 group, and the LED group output of Ni group is connected with the LED input of Ni+1 group, and each LED module like this is connected to each other; C point and the control of the second switch Q2-1 ~ Q2-35 of each LED module are broken and are connected to the voltage stabilizing didoe ZD1 ~ ZD35 of the second resistance R2-1 ~ R2-35 that connected between base stage respectively; The output of the LED of last LED module is connected with Vin-.In figure, in each LED module, the number of LED is 3, accumulative pressure drop is about 9V, consider that the minimum operating voltage of galvanostat is about 2V, so voltage stabilizing didoe ZD1 ~ ZD35 at least selects the voltage-stabiliser tube of more than voltage stabilizing value 12V, suppose that the saturation voltage drop of the first switch is 0.2v, 35 the first switch conductions at least produce 7V pressure drop, so voltage stabilizing value the best of voltage stabilizing didoe ZD35 is 12+7=19V.
The pulsating voltage of alternating current 220V after rectification, peak value is about 320V, before pulsating voltage rises to 9V from 0, circuital current is zero, when pulsating voltage continues to rise, before arriving 19V, Vin voltage drives Q1-35 conducting through resistance R1-35, first switch Q1-1 ~ Q1-35 in each module is all saturated, electric energy only consumes at flow restricter CL20, when pulsating voltage is increased beyond 19V, voltage stabilizing didoe ZD35 conducting, the second switch conducting of N35, control the first switch and enter cut-off state, the LED that electric current flows through N35 is luminous, afterwards along with Vin voltage continues to rise, often rise 9V, luminous with regard to many one group of LED, sequence of light is followed successively by N34, N33, N32, ..N1, as long as voltage is enough high, N1 will be luminous.Vin arrives after peak and starts toward declining, and along with the decline of voltage, each group LED can extinguish again successively, order be N1, N2, N3 ... N35.
When the pulsating voltage rising of alternating current 220V after rectification arrives certain value, the LED of N35 is luminous, afterwards along with Vin voltage continues to rise, N34 group LED is luminous, sequence of light be followed successively by N35, N34, N33, N32 ... ..N1, as long as voltage is enough high, N1 will be luminous.Vin arrives after peak and starts toward declining, and along with the decline of voltage, each group LED can extinguish again successively, order be N1, N2, N3 ... N35.
Analyze from above, prior art judges to determine the quantity that LED lights according to the height of pulsating voltage, and the LED operating time that corresponding low pressure is lighted is greater than the operating time of the LED that high pressure just can be lighted.Its shortcoming is that glow frequency is not high, is generally 100 or 120Hz.Although human eye cannot feel flicker, there will be the picture filaments of sun when picture pick-up device uses and roll and flicker.
In view of this, being promoted by the glow frequency of LED under the condition of pulsation driving is also highly significant.
[summary of the invention]
Technical problem to be solved by this invention is to provide a kind of LED driving frequency of pulsing to promote circuit, and glow frequency can be made to be promoted to 400HZ or higher.
The present invention solves the problems of the technologies described above by the following technical solutions:
A kind of LED driving frequency of pulsing promotes circuit, comprises switch module, the switch module of a measuring ability with voltage, a single-way switch, one first LED group, the one second LED group of a bridge rectifier, the switch module of one first detection with voltage and current-limiting function, one second detection with voltage and current-limiting function;
Described bridge rectifier output head anode connects the switch module of described first detection with voltage and current-limiting function and the switch module of the second detection with voltage and current-limiting function respectively, and described bridge rectifier output head anode also connects the switch module of described measuring ability with voltage; Described bridge rectifier minus earth;
The switch module of described first detection with voltage and current-limiting function also connects described first LED group positive pole, described first LED group minus earth;
The switch module of described second detection with voltage and current-limiting function also connects described second LED group positive pole, and described second LED group negative pole connects the switch module of described measuring ability with voltage; The switch module other end ground connection of described measuring ability with voltage;
Described single-way switch is connected between described first LED group positive pole and described second LED group negative pole; The positive pole of described single-way switch connects described second LED group negative pole, and the negative pole of described single-way switch connects the first LED group positive pole;
The switch module of described first detection with voltage and current-limiting function comprises one first voltage comparator, one first flow restricter, one first Live switch; The input of described first voltage comparator and the input of described first flow restricter are all connected to the positive pole of described bridge rectifier; The output of described first voltage comparator is connected with the control end of the first Live switch; The output of described first flow restricter connects the input of described first Live switch; The output of described first Live switch connects described first LED group;
The switch module of described second detection with voltage and current-limiting function comprises one second voltage comparator, one second flow restricter, one second Live switch; The input of described second voltage comparator and the input of described second flow restricter are all connected to the positive pole of described bridge rectifier; The output of described second voltage comparator is connected with the control end of the second Live switch; The output of described second flow restricter connects the input of described first Live switch; The output of described second Live switch connects described second LED group;
The switch module of described measuring ability with voltage comprises a tertiary voltage comparator, one the 3rd Live switch; The positive pole of the described bridge rectifier that the input of described tertiary voltage comparator is connected to; The output of described tertiary voltage comparator is connected with the control end of described 3rd Live switch; The output head grounding of described 3rd Live switch.
Further, described first voltage comparator, described second voltage comparator, described tertiary voltage comparator are voltage stabilizing didoes.
Further, described first flow restricter, the second flow restricter are resistance, or have the circuit of current-limiting function.
Further, described first Live switch, described second Live switch, described 3rd Live switch are triode or field effect transistor, or the multiple tube be made up of the two.
Further, described single-way switch is diode, or has the circuit of single-way switch function.
The invention has the advantages that: 1, make glow frequency be promoted to 400HZ or higher.2, the fluorescent lifetime of all light-emitting diodes is identical with electric current, can realize the utilization to greatest extent of light-emitting diode, makes the number of LED minimized, reduces product cost and enhances competitiveness.3, because glow frequency is high and each LED fluorescent lifetime is identical, thus single pulse electric current can be set in lower, safe, reasonably in scope, realize enough brightness.4, because frequency rises, pulse current peak declines, and the current specification of drive circuit semiconductor requires to reduce, integrated more easily, cost decreases.5, the connecting line between driving power and LED group only has two, flexible layout, simple.
[accompanying drawing explanation]
The invention will be further described in conjunction with the embodiments with reference to the accompanying drawings.
Fig. 1 is prior art LED alternating-current driving power circuit figure.
Fig. 2 is that LED of the present invention pulsation driving frequency promotes circuit diagram.
Fig. 3 is another embodiment of the present invention schematic diagram.
[embodiment]
As shown in Figure 2, a kind of LED pulsation driving frequency promotes circuit, comprises switch module 4, the single-way switch D1 of switch module 2,1 second detection with voltage of bridge rectifier 1,1 first detection with voltage and current-limiting function and switch module 3, measuring ability with voltage of current-limiting function, one first LED group 5,1 second LED group 6.
Bridge rectifier 1 positive pole connects the switch module 2 of the first detection with voltage and current-limiting function and the switch module 3 of the second detection with voltage and current-limiting function respectively, the switch module 4 of bridge rectifier 1 positive pole also connecting band voltage detecting function; Bridge rectifier 1 minus earth;
The switch module 2 of the first detection with voltage and current-limiting function also connects 2 first LED group 5, first LED group 5 other end ground connection;
The switch module 3 of the second detection with voltage and current-limiting function also connects the switch module 4 of the second LED group 6, second LED group 6 other end connecting band voltage detecting function; Switch module 4 other end ground connection of measuring ability with voltage;
Single-way switch D1 is connected between the switch module 2 of the first detection with voltage and current-limiting function and the second LED group 6;
The switch module 2 of the first detection with voltage and current-limiting function comprises one first voltage comparator ZD1, one first flow restricter CL1, one first Live switch K1; The input of the first voltage comparator ZD1 and the input of the first flow restricter CL1 are all connected to the positive pole of bridge rectifier 1; Control end and the output of the first flow restricter CL1 of the first voltage comparator ZD1 are all connected the input of the first Live switch K1; The output of the first Live switch K1 connects the first LED group 5;
The switch module 3 of the second detection with voltage and current-limiting function comprises one second voltage comparator ZD2, one second flow restricter CL2, one second Live switch K2; The input of the second voltage comparator ZD2 and the input of the second flow restricter CL2 are all connected to the positive pole of bridge rectifier 1; Control end and the output of the second flow restricter C2 of the second voltage comparator ZD2 are all connected the input of the second Live switch K2; The output of the second Live switch K2 connects the second LED group 6;
The switch module 4 of measuring ability with voltage comprises a tertiary voltage comparator Z3, one the 3rd Live switch K3; The positive pole of the bridge rectifier 1 that the input of tertiary voltage comparator K3 is connected to; The control end of tertiary voltage comparator K3 connects the input of the 3rd Live switch K3; The output head grounding of the 3rd Live switch K3.
Each several part circuit function:
Alternating current becomes pulsating voltage Vin and exports to this device after bridge rectifier, and positive pole is connected with the upper end of ZD1 ~ ZD3.First LED group 5 and the second LED group 6 are two LED groups, joined respectively be formed in parallel by multiple LED strip, the LED of the same type that the identical progression of namely connecting of the pressure drop Vf of two groups of lamp strings is identical.D1 is single-way switch, the switch right-to-left conducting when the voltage on the right of switch is greater than the left side, otherwise is then off.K1, K2, K3 are Live switch, and ZD1 ZD2 is used for detecting flow restricter CL1 and CL2 both end voltage respectively, is disconnected by K1 K2 when voltage is greater than certain value time; Tertiary voltage comparator ZD3 is used for detecting rectifier output voltage, controls the 3rd Live switch K3 make it open a way when this voltage is greater than certain value.
The course of work:
When Vin voltage is lower than Vf, lamp group does not all work, when Vin voltage is higher than Vf, because K1, K2, K3 are conducting states, and D1 is in open-circuit condition, the first LED group 5 and the second LED group 6 are in parallel connection, and the electric current of each lamp group is controlled respectively by CL1, CL2 respectively, first LED group 5 and the second LED group 6 are simultaneously luminous, and brightness can realize unanimously.
Suppose that the conducting voltage of ZD1/2 is 12V, the K1/2 cut-off when CL1/2 both end voltage is greater than 12V, the first LED group 5/ second LED group 6 is extinguished; The conduction voltage drop that the conducting voltage set point of ZD3 should be greater than LED group adds 12V, and when Vin is greater than Vf+12V, ZD3 conducting, K3 ends.
Along with the continuation of Vin is risen, when magnitude of voltage is greater than 2 × Vf, because now CL2 both end voltage is lower than 12V, so K2 reverts to conducting state again, now current direction is Vin+-CL2-LED2-D1-LED1-Vin-, and the first LED group 5/ second LED group 6 is series relationship, but because electric current is still controlled by CL2, and equal CL1, so it is identical with time in parallel to change into the first LED group 5/ second LED group 6 illumination effect after being connected in series, realization waits brightness secondary luminous.When alternating current is from peak toward when declining, there will be such twice luminescence process with brightness equally, each light-emitting diode is made full use of on an equal basis.Choose suitable Vf can realize half ac cycle equal intervals time, etc. 4 luminescences of brightness, the alternating current of 50Hz becomes the illumination effect of 400Hz so originally, eliminates scintillation.
The present invention is when applying, by switch module 2, second detection with voltage of described first detection with voltage and current-limiting function and the switch module 3 of current-limiting function and the switch module 4 of measuring ability with voltage realize the connected mode of frequency upgrading, can also be by one with voltage logic control integrated circuit 7 realize, as shown in Figure 3.
Specifically comprise integrated circuit 7,1 first flow restricter CL1 that a bridge rectifier 1, controls with voltage logic, one second flow restricter CL2, one first Live switch K1, one second Live switch K2, one the 3rd Live switch K3, a single-way switch D1, one first LED group 5 and one second LED group 6; Described integrated circuit 7 comprise be electrically connected successively one for the detection voltage detection module 71, that detects input voltage for judging the voltage output module 73 that input voltage size exports with the logic control element 72 and a control voltage that whether export control voltage; Described voltage output module 73 is electrically connected with described first Live switch K1, the second Live switch K2 and the 3rd Live switch K3 three respectively;
Described bridge rectifier 1 output head anode connects the described input of voltage detection module 71, first flow restricter CL1 and the input of the second flow restricter CL2 respectively; Described bridge rectifier 1 minus earth;
The output of described first flow restricter CL1 connects the input of described first Live switch K1; The described output of the first Live switch K1, the output of single-way switch D1 and the first LED group 5 positive pole three electrical connection, and described first LED group 5 minus earth;
The output of described second flow restricter CL2 connects the input of described second Live switch K2; The output of described second Live switch K2 is connected with described second LED group 6 positive pole; The input of described second LED group 6 negative pole, single-way switch D1 and the input three electrical connection of the 3rd Live switch K3, and the output head grounding of described 3rd Live switch K3.
Described logic control element 72 obtains the voltage that voltage detection module 71 collects from bridge rectifier 1 and judges; Supply power voltage is VI, and the first LED group 5 operating voltage in parallel with both the second LED groups 6 is VP, and the operating voltage that the first LED group 5 is connected with both the second LED groups 6 is VS; As VI > VP, by the input voltage of voltage output module 73 control K1, K2, K3, make the equal conducting of K1, K2, K3 three, both first LED group 5 and the second LED group 6 parallel operation, after the lighting time set, by the input voltage of voltage output module 73 control K1, K2, both K1, K2 are all disconnected, first, second LED group (5,6) is all extinguished; As VI > VS, by the input voltage of voltage output module 73 control K1, K2, K3, make K2 conducting, and make K1, K3 keep open circuit, the tandem working of both first LED group 5 and the second LED group 6, after the lighting time set, by the input voltage of voltage output module 73 control K1, K2, both K1, K2 are all disconnected, and first, second LED group is all extinguished; When VI continue to rise to ceiling voltage decline subsequently time, then by the input voltage of voltage output module 73 control K1, K2, K3, make first, second LED group all be introduced into series model and light and enter paralleling model again and light; Lighting time when lighting time and voltage rise is identical, fall time between lighting for twice also identical extinguishing allow the first LED group 5 and light 4 times at equal intervals in the operating time of the second LED group 6 in a half-wave of supply power voltage, namely realize the lifting of LED ignition frequency.
Above-described embodiment and graphic and non-limiting product form of the present invention and style, any person of an ordinary skill in the technical field, to its suitable change done or modification, all should be considered as not departing from patent category of the present invention.
Claims (4)
1. LED driving frequency of pulsing promotes a circuit, it is characterized in that: the switch module, the switch module of a measuring ability with voltage, a single-way switch, one first LED group, the one second LED group that comprise a bridge rectifier, the switch module of one first detection with voltage and current-limiting function, one second detection with voltage and current-limiting function;
Described bridge rectifier output head anode connects the switch module of described first detection with voltage and current-limiting function and the switch module of the second detection with voltage and current-limiting function respectively, and described bridge rectifier output head anode also connects the switch module of described measuring ability with voltage; Described bridge rectifier minus earth;
The switch module of described first detection with voltage and current-limiting function also connects described first LED group positive pole, described first LED group minus earth;
The switch module of described second detection with voltage and current-limiting function also connects described second LED group positive pole, and described second LED group negative pole connects the switch module of described measuring ability with voltage; The switch module other end ground connection of described measuring ability with voltage;
Described single-way switch is connected between described first LED group positive pole and described second LED group negative pole; The positive pole of described single-way switch connects described second LED group negative pole, and the negative pole of described single-way switch connects the first LED group positive pole;
The switch module of described first detection with voltage and current-limiting function comprises one first voltage comparator, one first flow restricter, one first Live switch; The input of described first voltage comparator and the input of described first flow restricter are all connected to the positive pole of described bridge rectifier; The output of described first voltage comparator is connected with the control end of the first Live switch; The output of described first flow restricter connects the input of described first Live switch; The output of described first Live switch connects described first LED group;
The switch module of described second detection with voltage and current-limiting function comprises one second voltage comparator, one second flow restricter, one second Live switch; The input of described second voltage comparator and the input of described second flow restricter are all connected to the positive pole of described bridge rectifier; The output of described second voltage comparator is connected with the control end of the second Live switch; The output of described second flow restricter connects the input of described first Live switch; The output of described second Live switch connects described second LED group;
The switch module of described measuring ability with voltage comprises a tertiary voltage comparator, one the 3rd Live switch; The positive pole of the described bridge rectifier that the input of described tertiary voltage comparator is connected to; The output of described tertiary voltage comparator is connected with the control end of described 3rd Live switch; The output head grounding of described 3rd Live switch.
2. a kind of LED pulsation driving frequency as claimed in claim 1 promotes circuit, it is characterized in that: described first flow restricter, the second flow restricter are resistance, or have the circuit of current-limiting function.
3. a kind of LED pulsation driving frequency as claimed in claim 1 promotes circuit, it is characterized in that: described first Live switch, described second Live switch, described 3rd Live switch are triode or field effect transistor, or the multiple tube be made up of the two.
4. a kind of LED pulsation driving frequency as claimed in claim 1 promotes circuit, it is characterized in that: described single-way switch is diode, or has the circuit of single-way switch function.
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| CN201210372297.5A CN102984851B (en) | 2012-09-29 | 2012-09-29 | Light-emitting diode (LED) pulsation driving frequency improving circuit |
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|---|---|---|---|
| CN201210372297.5A CN102984851B (en) | 2012-09-29 | 2012-09-29 | Light-emitting diode (LED) pulsation driving frequency improving circuit |
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| CN102984851A CN102984851A (en) | 2013-03-20 |
| CN102984851B true CN102984851B (en) | 2015-04-15 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103220863B (en) * | 2013-04-22 | 2015-04-15 | 俞文英 | Flicker-free method for alternating current driving of light-emitting diodes (LEDs) and device thereof |
| JP7023648B2 (en) * | 2017-09-22 | 2022-02-22 | 株式会社小糸製作所 | Lighting circuit and vehicle lighting |
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| CN101605412A (en) * | 2009-07-17 | 2009-12-16 | 罗宏基 | The LED electrified light emitting circuit |
| CN101630920A (en) * | 2009-05-21 | 2010-01-20 | 立明股份有限公司 | LED lighting lamp and power supply device thereof |
| CN102006703A (en) * | 2010-12-03 | 2011-04-06 | 何志雄 | Light-emitting diode (LED) lamp driving power supply |
| CN202841630U (en) * | 2012-09-29 | 2013-03-27 | 福州凡普科技有限公司 | Light-emitting diode (LED) pulse driving frequency improving circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4943402B2 (en) * | 2008-10-09 | 2012-05-30 | シャープ株式会社 | LED drive circuit, LED illumination lamp, LED illumination device, and LED illumination system |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101630920A (en) * | 2009-05-21 | 2010-01-20 | 立明股份有限公司 | LED lighting lamp and power supply device thereof |
| CN101605412A (en) * | 2009-07-17 | 2009-12-16 | 罗宏基 | The LED electrified light emitting circuit |
| CN102006703A (en) * | 2010-12-03 | 2011-04-06 | 何志雄 | Light-emitting diode (LED) lamp driving power supply |
| CN202841630U (en) * | 2012-09-29 | 2013-03-27 | 福州凡普科技有限公司 | Light-emitting diode (LED) pulse driving frequency improving circuit |
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