CN109640460A - A kind of LED is without frequent flashing control circuit - Google Patents
A kind of LED is without frequent flashing control circuit Download PDFInfo
- Publication number
- CN109640460A CN109640460A CN201910105891.XA CN201910105891A CN109640460A CN 109640460 A CN109640460 A CN 109640460A CN 201910105891 A CN201910105891 A CN 201910105891A CN 109640460 A CN109640460 A CN 109640460A
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- Prior art keywords
- electric current
- current mirror
- mirror tube
- current
- control circuit
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
Abstract
The present invention provides a kind of LED without frequent flashing control circuit, and the current mirror of M1, M2 composition realizes current mirror；Pressure pad pipe M3 improves the grid-control voltage of current mirror, reduces current mirror mirror ratio；Electric current in current-limiting resistance limit path；Anti- electric current, which flows backward diode D1, prevents electric current from flowing backward into current mirror；For charging capacitor C1 for storing voltage, continuous current circuit D2 persistently provides electric current to LED light.The electric current that the electric current of current mirror mirror and continuous current circuit generate guarantee can regulatory control light modulator have holding circuit access, to reduce scintillation index, while also can guarantee that input current is identical with input voltage phase, guarantee there is high power factor (PF).The invention has the advantages that circuit structure is simple, goes that strobe effect is obvious, chip area is small, at low cost, power factor (PF) is high.
Description
Technical field
The present invention relates to LED lamp fields more particularly to a kind of LED without frequent flashing control circuit.
Background technique
The appearance of LED light greatly reduces electric power required for illumination, and the LED light of same wattage, required electric power only has white
The 1/10 of vehement lamp, while LED lamp has many advantages, such as service life long, environmental protection, non-maintaining, and controllable silicon dimmer be widely used in it is white
The traditional lightings such as vehement lamp market, is simply easy to be available for consumer use, and meets the use habit of people, if LED light is wanted to take
The position of the traditional lightings lamps and lanterns such as incandescent lamp for controllable silicon light modulation, it is necessary to and controllable silicon dimmer is compatible.
The light modulation mechanism of controllable silicon dimmer, it realizes pressure regulation or light modulation using phase control method.In sine
The a certain moment after alternating current wave zero passage extremely above adds a trigger pulse in SCR control, makes controlled silicon conducting, this conducting will
It maintains to sine wave positive half cycle to terminate.From controllable silicon light modulation principle it is found that the voltage waveform of light modulator output has no longer been just
String wave, except non-dimmer is in fully conducting state, i.e. the angle of flow is 180 °.Cut just because of sine wave, waveform by
The problems such as destroying, bringing interference to power grid, will generate audio-frequency noise and flashing for the driving power of LED, cause opening
Closing the LED light under switching state will appear the problem of lamp dodges, and also reduce power factor (PF) value of circuit, and the angle of flow is got over
One-hour rating factor value is lower.
Summary of the invention
In view of the above problems, the present invention provides a kind of LED without frequent flashing control circuit, lamp sudden strain of a muscle occurs to avoid LED light
Problem, and the circuit has High Power Factor, it is easy to accomplish it controls to adjust, structure is simple, and required cost is relatively low.
In order to solve the above-mentioned technical problem, the application adopts the following technical scheme that
A kind of LED is without frequent flashing control circuit, comprising: electric current mirror tube, pressure pad pipe, current-limiting resistance, charging capacitor, anti-electric current fall
Diode, freewheeling diode are filled, the grid of current mirror is connected with current-limiting resistance, and electric current mirror tube (M1) is connected with pressure pad pipe, pressure pad
Pipe is linked to be the mode of diode, and anti-electric current flows backward Diode series between current-limiting resistance and charging capacitor, freewheeling diode with
It connects after electric current mirror tube (M2) is in parallel with charging capacitor.
Current mirror is made of electric current mirror tube (M1) and electric current mirror tube (M2), pressure pad pipe, current-limiting resistance, wherein electric current mirror tube
(M1) and electric current mirror tube (M2) is high-voltage tube, and pressure pad pipe is low-voltage tube.Electric current mirror tube (M2) is greater than the size of electric current mirror tube (M1).
Pressure pad pipe improves the grid voltage of electric current mirror tube (M2) and then reaches the size for reducing electric current mirror tube (M2).Current-limiting resistance limitation electricity
The electric current of present branch is hindered, the electric current of branch consumption, increase power factor are reduced
The current mirror of electric current mirror tube composition, the electric current of mirror image rectifier bridge side are powered to LED light string.
Electric freewheeling diode and charging capacitor and LED light string constitute continuous current circuit, provide continued power electricity for LED light string
Stream.
Input current phase and the same phase of input voltage phase, guarantee have higher power factor (PF).
Detailed description of the invention
Attached drawing 1 is nuclear structure figure of the LED without frequent flashing control circuit in one embodiment of the invention；
Attached drawing 2 is specific implementation structure chart of the LED without frequent flashing control circuit in one embodiment of the invention；
The waveform diagram of A point voltage, B point voltage, C point voltage, D point voltage in embodiment described in attached drawing 3；
The waveform diagram of LED light string voltage and lamp string electric current in embodiment described in attached drawing 4；
Specific embodiment
The present invention provides a kind of method of the LED without frequent flashing control circuit.To make the purpose of the present invention, technical solution and effect
Clearer, clear, the present invention is described in more detail referring to the drawings.It should be appreciated that specific reality described herein
Example is applied only to explain the present invention, is not intended to limit the present invention.
In the prior art, conducting voltage Shi Caiyou electric current is greater than in voltage due to LED light source, when the voltage at its both ends is less than
No current passes through when conducting voltage；The light modulation mechanism of controllable silicon dimmer, sine wave is cut, waveform wrecks, can be to electricity
Mesh belt interferes, and for the driving power of LED will generate audio-frequency noise and flashing, and the LED lamp is caused to will appear lamp sudden strain of a muscle
Problem also reduces power factor (PF) value of circuit.
To solve the above-mentioned problems, core of the invention is LED without frequent flashing control circuit, and attached drawing 2 is the present invention one
Specific implementation structure chart of the LED without frequent flashing control circuit, the LED mainly include without frequent flashing control circuit in embodiment, light modulator,
Rectifier bridge, constant-current control module, LED light string, electric current mirror tube, pressure pad pipe, current-limiting resistance, charging capacitor, anti-electric current flow backward two poles
Pipe, freewheeling diode.
Current mirror is made of electric current mirror tube (M1) and electric current mirror tube (M2), pressure pad pipe, current-limiting resistance, wherein electric current mirror tube
(M1) and electric current mirror tube (M2) is high-voltage tube, and pressure pad pipe is low-voltage tube.Electric current mirror tube (M2) is greater than the size of electric current mirror tube (M1).
Pressure pad pipe improves the grid voltage of electric current mirror tube (M2) and then reaches the size for reducing electric current mirror tube (M2).Current-limiting resistance limitation electricity
The electric current of present branch is hindered, the electric current of branch consumption, increase power factor are reduced.
The size of reasonable set pressure pad pipe can reduce the size of electric current mirror tube M1 and current mirror pipe M2, reduce area,
Reduce cost.
The current mirror of electric current mirror tube composition, the electric current of mirror image rectifier bridge side are powered to LED light string.
Electric freewheeling diode and charging capacitor and LED light string constitute continuous current circuit, provide continued power for LED light string.
Above-mentioned modules have its corresponding function: LED light string in the circuit, for providing LED light source；Rectifier bridge,
It is connected by light modulator with external power supply, for rectifying to have passed through phase-adjusted alternating current, and LED light string is given to supply
Electricity；Constant-current control module is not kept constant for controlling LED light ource electric current with voltage waveform variation.The inspection of R2 and R3 electric resistance partial pressure
The voltage after stablizing is surveyed, firm power is used for.R4 resistance defines the electric current of LED light string.The grid and current-limiting resistance of current mirror
It is connected, electric current mirror tube (M1) is connected with pressure pad pipe, and pressure pad pipe is linked to be the mode of diode, and anti-electric current flows backward Diode series and limiting
Between leakage resistance and charging capacitor, connect after freewheeling diode is in parallel with electric current mirror tube (M2) with electrolytic capacitor.Electric current mirror tube
The current mirror of composition, the electric current of mirror image rectifier bridge side are powered to LED light string.Electric freewheeling diode and charging capacitor and LED light
String constitutes continuous current circuit, provides continued power for LED light string.Input current phase and the same phase of input voltage phase, guarantee have compared with
High power factor (PF).
Specific work process of the LED without stroboscopic power compensation control circuit is as follows:
As shown in figure 3, power supply is powered to LED light string after power supply electrifying, when supply voltage increases, capacitor C1 is filled
Electricity, D point voltage rise, and D point voltage is up to a dynamic balance state after several periods, in the t1 rank that power supply rises
Section, D point voltage is much larger than B point voltage at this time, and with the rising of A point voltage, M1 tube current increases, and M2 pipe is LED by capacitor
Lamp string power supply, freewheeling diode is that LED light string is powered by capacitor, when the rising of the voltage of B is close to D point voltage, at this time when t2
It carves the rectifier bridge and provides electric current for LED light string, while the current direction of current mirror is reversed, consume rectifier bridge electric current, continue simultaneously
It flows diode and is not also providing electric current, the decline of t3 stage M2 mirror image tube grid voltage, D point voltage decline, in B point voltage to capacitor
It is still rectifier bridge for LED light string power supply when not decreaseing beyond D point voltage, when the t4 stage is when supply voltage B continues decline,
M2 pipe is LED light string power supply by capacitor at this time, and freewheeling diode is LED light string power supply by capacitor.Diagram 4 is LED light string
Voltage and current waveform figure, to sum up shown, in the whole cycle stage, LED has lasting electric current power supply, so that the system overcomes
Lamp existing in the prior art such as dodges at the variety of problems.The above embodiments are merely illustrative of the technical solutions of the present invention, description
More specific and detail, rather than its limitations；Although referring to above-described embodiment, invention is explained in detail, this field
Those of ordinary skill should understand that；It can still modify to technical solution documented by the various embodiments described above, or
Equivalent substitute is carried out to part of technical characteristic；And these are modified or replaceed, and do not make the essence of corresponding technical solution de-
Spirit and scope from technical solution of various embodiments of the present invention.
Claims (7)
1. a kind of LED is without frequent flashing control circuit, comprising: electric current mirror tube (M1), electric current mirror tube (M2), pressure pad pipe (M3), current limliting electricity
Hinder (R1), charging capacitor (C1), anti-electric current flow backward diode (D1), freewheeling diode (D2), the grid of electric current mirror tube (M1) with
Drain electrode is connected, and is connected with the grid of electric current mirror tube (M2), and the grid of current mirror is connected with current-limiting resistance (R1), electric current mirror tube
(M1) it connects with pressure pad pipe (M3), pressure pad pipe (M3) is linked to be the mode of diode, and anti-electric current flows backward diode (D1) and is connected on limit
Between leakage resistance (R1) and charging capacitor (C1), after freewheeling diode (D2) is in parallel with electric current mirror tube (M2) with electrolytic capacitor
(C1) it connects.
2. LED according to claim 1 is without frequent flashing control circuit, it is characterised in that: the current mirror is by electric current mirror tube
(M1) it is formed with electric current mirror tube (M2), pressure pad pipe (M3), current-limiting resistance (R1), wherein electric current mirror tube (M1) and electric current mirror tube (M2)
For high-voltage tube, pressure pad pipe (M3) is low-voltage tube.
3. LED according to claim 2 is without frequent flashing control circuit, which is characterized in that the electric current mirror tube (M2) is greater than electricity
The size of mirror tube (M1) is flowed, pressure pad pipe (M3), which is used to improve the grid voltage of electric current mirror tube (M2) and then reaches, reduces electric current mirror tube
(M2) size purpose.
4. LED according to claim 1 is without frequent flashing control circuit, which is characterized in that the anti-electric current flows backward diode
(D1), prevent B point voltage in the decline stage, D point is to the reversed reverse irrigated current of B point.
5. LED according to claim 1 is without frequent flashing control circuit, which is characterized in that current-limiting resistance (R1) the limitation electricity
The electric current of present branch is hindered, the electric current of branch consumption, increase power factor are reduced.
6. LED according to claim 1 is without frequent flashing control circuit, which is characterized in that the anti-freewheeling diode (D2) with
Charging capacitor (C1) and LED light string constitute continuous current circuit, provide continued power electric current for LED light string.
7. LED according to claim 6 is without frequent flashing control circuit, which is characterized in that input current phase and input voltage
Phase, guarantee have higher power factor (PF).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910105891.XA CN109640460A (en) | 2019-02-01 | 2019-02-01 | A kind of LED is without frequent flashing control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910105891.XA CN109640460A (en) | 2019-02-01 | 2019-02-01 | A kind of LED is without frequent flashing control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109640460A true CN109640460A (en) | 2019-04-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910105891.XA Pending CN109640460A (en) | 2019-02-01 | 2019-02-01 | A kind of LED is without frequent flashing control circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112994193A (en) * | 2021-05-06 | 2021-06-18 | 深圳市永联科技股份有限公司 | Charging protection circuit module and related product |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103889113A (en) * | 2014-03-03 | 2014-06-25 | 深圳市明微电子股份有限公司 | LED current ripple eliminating circuit and LED lighting device |
| US20150145427A1 (en) * | 2010-08-24 | 2015-05-28 | Cirrus Logic, Inc | Boost and linear led control |
| CN206226773U (en) * | 2016-08-02 | 2017-06-06 | 陕西亚成微电子股份有限公司 | A kind of LED is without stroboscopic adjusting control circuit |
| CN108140693A (en) * | 2015-09-28 | 2018-06-08 | 西铁城时计株式会社 | Led drive circuit |
-
2019
- 2019-02-01 CN CN201910105891.XA patent/CN109640460A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150145427A1 (en) * | 2010-08-24 | 2015-05-28 | Cirrus Logic, Inc | Boost and linear led control |
| CN103889113A (en) * | 2014-03-03 | 2014-06-25 | 深圳市明微电子股份有限公司 | LED current ripple eliminating circuit and LED lighting device |
| CN108140693A (en) * | 2015-09-28 | 2018-06-08 | 西铁城时计株式会社 | Led drive circuit |
| CN206226773U (en) * | 2016-08-02 | 2017-06-06 | 陕西亚成微电子股份有限公司 | A kind of LED is without stroboscopic adjusting control circuit |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112994193A (en) * | 2021-05-06 | 2021-06-18 | 深圳市永联科技股份有限公司 | Charging protection circuit module and related product |
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Application publication date: 20190416 |
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