CN109496016A - A kind of High Power Factor LED drive power low-frequency ripple suppressing method - Google Patents
A kind of High Power Factor LED drive power low-frequency ripple suppressing method Download PDFInfo
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- CN109496016A CN109496016A CN201811587273.5A CN201811587273A CN109496016A CN 109496016 A CN109496016 A CN 109496016A CN 201811587273 A CN201811587273 A CN 201811587273A CN 109496016 A CN109496016 A CN 109496016A
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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]
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Abstract
The present invention relates to a kind of High Power Factor LED drive power low-frequency ripple suppressing methods, provide AC power source, rectification circuit, single-stage power factor correcting circuit, LED load and ripple suppression circuit；The AC power source is connected with the input terminal of the rectification circuit, the positive and negative output end of rectification circuit is connected with the positive and negative input terminal of the single-stage power factor correcting circuit respectively, is LED load power supply together with the output-parallel of ripple suppression circuit by the output of single-stage power factor correcting circuit.The present invention is able to suppress the low-frequency ripple of LED light electric current, and leakage inductance energy is made to be utilized effectively.
Description
Technical field
The present invention relates to LED drive power field, especially a kind of High Power Factor LED drive power low-frequency ripple inhibits
Method.
Background technique
LED with its energy-saving and environmental protection, efficiently, the long-life many advantages, such as, become a new generation green illumination light source.With
LED lighting technology it is increasingly mature, it will be widely used in every field.In Alternating Current Power Supply occasion, in order to meet
The harmonic requirement of IEC61000-3-2, LED drive power require to carry out PFC.
LED drive power with power factor emendation function by its topographical form can be divided into single-level circuit topology and
Two-stage circuit topology.Two-stage circuit topology generallys use the circuit structure of Boost-PFC converter and DC/DC converter, prime
Boost-PFC converter realizes power factor emendation function, and rear class DC/DC converter realizes the current constant control to LED light, but adopts
With the LED drive power of two stage power translation circuit, exporting energy have passed through two stage power transformation, low efficiency, at high cost, circuit
Structure is complicated, limits its application in LED drive power.Single-level circuit topology because its structure is simple, at low cost, power because
The advantages that number is high and high-efficient is widely used in small-power occasion, however single-level power factor LED drive circuit is due to wink
When input power and constant output it is uneven, cause it to export electric current there are biggish low-frequency ripple, make to go out when LED operation
Existing stroboscopic problem.Therefore, the low ripple LED drive power with PFC ability becomes research hotspot.
Summary of the invention
In view of this, the purpose of the present invention is to propose to a kind of High Power Factor LED drive power low-frequency ripple suppressing method,
It is able to suppress the low-frequency ripple of LED light electric current, and leakage inductance energy is made to be utilized effectively.
The present invention is realized using following scheme: a kind of High Power Factor LED drive power low-frequency ripple suppressing method provides
AC power source, rectification circuit, single-stage power factor correcting circuit, LED load and ripple suppression circuit；The AC power source with
The input terminal of the rectification circuit is connected, the positive and negative output end of rectification circuit respectively with the single-stage power factor correcting circuit
Positive and negative input terminal be connected, by the output of single-stage power factor correcting circuit together with the output-parallel of ripple suppression circuit
For LED load power supply.
Further, the ripple suppression circuit includes leakage inductance energy absorbing circuit and flyback converter；Leakage inductance energy is inhaled
The input terminal for receiving circuit is connected with the transformer primary winding in single-stage power factor correcting circuit, to absorb by single stage power
The due to voltage spikes that transformer leakage inductance in factor correcting circuit generates, the output end and flyback converter of leakage inductance energy absorbing circuit
Input terminal is connected, and the output end of the flyback converter and the output-parallel of single-stage power factor correcting circuit are connected to together
LED load；
By the duty ratio of switching tube in control flyback converter, so that ripple suppression circuit generates one and single stage power
Factor correcting circuit exports that electric current low-frequency ripple is equal in magnitude, ripple compensation signal of opposite in phase, to inhibit LED light electric
The low-frequency ripple of stream, and leakage inductance energy is made to be utilized effectively.
Further, the leakage inductance energy absorbing circuit include the first clamp diode D1, the second clamp diode D2, with
And the anode of clamp capacitor C1, the anode of the first clamp diode D1 and the second clamp diode D2 are as the leakage
The input terminal of inductance energy absorbing circuit, the cathode phase of the cathode and the second clamp diode D2 of the first clamp diode D1
Even, and it is connected to one end of clamp capacitor C1；The other end of the clamp capacitor C1 is connected to the negative output terminal of rectification circuit；Institute
State output end of the both ends of clamp capacitor C1 as the leakage inductance energy absorbing circuit；
The flyback converter includes transformer T2, switching tube S3 and diode D3；The primary side of the transformer T2 is different
Name end is connected to the drain electrode of switching tube S3, and the original side of the same name of the source electrode of the switching tube S3 and the transformer T2 are as flyback
The input terminal of converter；The secondary side Same Name of Ends of the transformer T2 is connected to the anode of the diode D3, the transformer T2
Secondary side different name end and the diode D3 output end of the cathode as flyback converter.
Further, the duty ratio by switching tube in control flyback converter, so that ripple suppression circuit generates
One electric current low-frequency ripple is equal in magnitude, opposite in phase ripple compensation signal is specific with single-stage power factor correcting circuit output
Are as follows: set the duty ratio of flyback converter are as follows:
D=KD*a[N]；
In formula, KDFor flyback converter switching tube duty ratio coefficient, a [N] is the Function Array of sine transform；Pass through detection
The voltage of clamp capacitor obtains duty ratio COEFFICIENT KD, and then flyback converter duty ratio size is adjusted, control output ripple compensation
The amplitude of electric current；Phase information is obtained by detection output current ripple, the reading order by changing array a [N] adjusts anti-
Exciting converter duty ratio waveform phase, to control the phase of output ripple compensation electric current；
Further, sampled signal V is obtained after clamp capacitor voltage is sampledcf, with reference voltage VrefCompare, by interior
Portion's PI program is adjusted, and obtains flyback converter switching tube duty ratio COEFFICIENT KD；Output electric current obtains sampled signal after over-sampling
Vif, with output current dc component signal VifdcCompare, obtains output current ripple signal Vrip, and obtained by phase-detection
Signal N is controlled, the reading order of array a [N] is determined, thus to obtain flyback transformer switching tube duty ratio D=KD*a[N]。
Further, the duty ratio COEFFICIENT KDAdjusting, need to meet claimed below:
Ripple suppression circuit can provide enough compensation energy, i.e. the input power of ripple suppression circuit is equal to output work
Rate；When ripple suppression circuit input power increases, duty ratio COEFFICIENT KDBecome larger, the amplitude of ripple compensation electric current becomes larger, output
Power increases；When input power reduces, duty ratio COEFFICIENT KDBecome smaller, the amplitude of ripple compensation electric current also becomes smaller, output power
Reduce；
Ripple suppression circuit does not influence main circuit and realizes power factor emendation function when working.
Further, main circuit is not influenced when the ripple suppression circuit works and realizes that power factor emendation function is specific
Are as follows: the voltage by controlling clamp capacitor is consistently greater than the original edge voltage of the transformer in single-stage power factor correcting circuit, makes
Obtain the power factor emendation function for not influencing single-stage power factor correcting circuit when ripple suppression circuit work.
Compared with prior art, the invention has the following beneficial effects: the present invention passes through control flyback converter switching tube
Duty ratio, so that ripple suppression circuit, which generates one, exports electric current low-frequency ripple size phase with single-stage power factor correcting circuit
Deng the ripple compensation signal of, opposite in phase, to inhibit the low-frequency ripple of LED light electric current, and obtain leakage inductance energy effectively
It utilizes.Has many advantages, such as efficient, High Power Factor and without stroboscopic.
Detailed description of the invention
Fig. 1 is the control circuit schematic illustration of the embodiment of the present invention.
Fig. 2 is the Ripple Suppression control principle block diagram of the embodiment of the present invention.
Fig. 3 is flyback converter switching tube duty ratio waveform diagram in the case of the different reading orders of the embodiment of the present invention.
Fig. 4 is the phase detection principle figure of the embodiment of the present invention.
Fig. 5 is the Ripple Suppression strategy program flow chart of the embodiment of the present invention.
Specific embodiment
The present invention will be further described with reference to the accompanying drawings and embodiments.
It is noted that described further below be all exemplary, it is intended to provide further instruction to the application.Unless another
It indicates, all technical and scientific terms used herein has usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singular
Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.
As shown in Figure 1, present embodiments providing a kind of High Power Factor LED drive power low-frequency ripple suppressing method, mention
For AC power source, rectification circuit, single-stage power factor correcting circuit, LED load and ripple suppression circuit；The AC power source
It is connected with the input terminal of the rectification circuit, the positive and negative output end of rectification circuit is electric with the single-level power factor correction respectively
The positive and negative input terminal on road is connected, by the output-parallel of the output of single-stage power factor correcting circuit and ripple suppression circuit one
It rises and powers for LED load.
In the present embodiment, the ripple suppression circuit includes leakage inductance energy absorbing circuit and flyback converter；Leakage inductance energy
The input terminal of amount absorbing circuit is connected with the transformer primary winding in single-stage power factor correcting circuit, to absorb by single-stage
The due to voltage spikes that transformer leakage inductance in circuit of power factor correction generates, the output end and flyback of leakage inductance energy absorbing circuit become
Parallel operation input terminal is connected, and the output end of the flyback converter and the output-parallel of single-stage power factor correcting circuit connect together
It is connected to LED load；
By the duty ratio of switching tube in control flyback converter, so that ripple suppression circuit generates one and single stage power
Factor correcting circuit exports that electric current low-frequency ripple is equal in magnitude, ripple compensation signal of opposite in phase, to inhibit LED light electric
The low-frequency ripple of stream, and leakage inductance energy is made to be utilized effectively.
In the present embodiment, the leakage inductance energy absorbing circuit includes the first clamp diode D1, the second clamp diode
D2 and clamp capacitor C1, the anode conduct of the anode of the first clamp diode D1 and the second clamp diode D2
The input terminal of the leakage inductance energy absorbing circuit, the cathode of the first clamp diode D1 and the yin of the second clamp diode D2
Extremely it is connected, and is connected to one end of clamp capacitor C1；The other end of the clamp capacitor C1 is connected to the negative output of rectification circuit
End；Output end of the both ends of the clamp capacitor C1 as the leakage inductance energy absorbing circuit；
The flyback converter includes transformer T2, switching tube S3 and diode D3；The primary side of the transformer T2 is different
Name end is connected to the drain electrode of switching tube S3, and the original side of the same name of the source electrode of the switching tube S3 and the transformer T2 are as flyback
The input terminal of converter；The secondary side Same Name of Ends of the transformer T2 is connected to the anode of the diode D3, the transformer T2
Secondary side different name end and the diode D3 output end of the cathode as flyback converter.
In the present embodiment, the duty ratio by switching tube in control flyback converter, so that ripple suppression circuit
It generates one and exports that electric current low-frequency ripple is equal in magnitude, ripple compensation signal of opposite in phase with single-stage power factor correcting circuit
Specifically: set the duty ratio of flyback converter are as follows:
D=KD*a[N]；
In formula, KDFor flyback converter switching tube duty ratio coefficient, a [N] is the Function Array of sine transform；Pass through detection
The voltage of clamp capacitor obtains duty ratio COEFFICIENT KD, and then flyback converter duty ratio size is adjusted, control output ripple compensation
The amplitude of electric current；Phase information is obtained by detection output current ripple, the reading order by changing array a [N] adjusts anti-
Exciting converter duty ratio waveform phase, to control the phase of output ripple compensation electric current；
Wherein, Ripple Suppression control principle block diagram is as shown in Fig. 2, wherein uC1For clamp capacitor voltage, iLEDFor output electricity
Stream, KCFor clamp capacitor voltage downsampling factor, KiTo export current sample coefficient, the duty ratio D=of ripple suppression circuit output
KD*a[N],KDFor duty ratio coefficient, a [N] is the Function Array of sine transform, for controlling the work of flyback converter switching tube.
By the control of amplitude and phase to compensation current ripples so that ripple compensation circuit generates one and single-level power factor school
Positive circuit exports that electric current low-frequency ripple is equal in magnitude, ripple compensation signal of opposite in phase, to inhibit the low of LED light electric current
Frequency ripple.
In the present embodiment, sampled signal V is obtained after clamp capacitor voltage is sampledcf, with reference voltage VrefCompare, passes through
It crosses internal PI program to adjust, obtains flyback converter switching tube duty ratio COEFFICIENT KD；Output electric current is sampled after over-sampling
Signal Vif, with output current dc component signal VifdcCompare, obtains output current ripple signal Vrip, and pass through phase-detection
Control signal N is obtained, the reading order of array a [N] is determined, thus to obtain flyback transformer switching tube duty ratio D=KD*a
[N]。
In the present embodiment, the duty ratio COEFFICIENT KDAdjusting, need to meet claimed below:
Ripple suppression circuit can provide enough compensation energy, i.e. the input power of ripple suppression circuit is equal to output work
Rate；When ripple suppression circuit input power increases, duty ratio COEFFICIENT KDBecome larger, the amplitude of ripple compensation electric current becomes larger, output
Power increases；When input power reduces, duty ratio COEFFICIENT KDBecome smaller, the amplitude of ripple compensation electric current also becomes smaller, output power
Reduce；
Ripple suppression circuit does not influence main circuit and realizes power factor emendation function when working.
In the present embodiment, main circuit is not influenced when the ripple suppression circuit works and realizes power factor emendation function tool
Body are as follows: the voltage by controlling clamp capacitor is consistently greater than the original edge voltage of the transformer in single-stage power factor correcting circuit,
So that ripple suppression circuit does not influence the power factor emendation function of single-stage power factor correcting circuit when working；Even if clamper is electric
Hold voltage VC1Consistently greater than transformer T1 primary side voltage nV0, i.e. VC1> nVo。
Particularly, the adjustable flyback converter duty ratio waveform phase of the reading order of array a [N], Fig. 3 gives several
Flyback converter switching tube duty ratio waveform in the case of the different reading orders of kind.Wherein, (a) is that standard array a [N] linearisation is bent
Line, when reading order is a [0] → a [1] ... a [360], in flyback converter switching tube duty ratio waveform such as Fig. 3
(b) shown in, duty ratio can be indicated at this time are as follows:
When reading order is a [90] → a [91] ... a [360] → [89] a a [0] ..., flyback converter is opened
It closes shown in (c) in pipe duty ratio waveform such as Fig. 3, duty ratio can indicate at this time are as follows:
When reading order is a [180] → a [181] ... a [360] → [179] a a [0] ..., flyback converter
Shown in (d) in switching tube duty ratio waveform such as Fig. 3, duty ratio can be indicated at this time are as follows:
By changing the adjustable flyback converter duty ratio waveform phase of reading order of array a [N], array a [N] packet
The data amount check N=360 contained, therefore have 360 groups of different reading orders, reading order is provided by phase-detection program, phase
Position detection principle diagram is as shown in Figure 4.Wherein iLEDripFor output current ripple, i1For main circuit output current, D is Ripple Suppression
Circuit flyback converter switching tube duty ratio waveform.In order to improve ripple phase-detection precision, selected phase-detection point slope
Answer it is larger, therefore phase test point selected by the present embodiment be A, B, C point.Due to circuit output equivalent impedance in the case of twice of power frequencyLED current ripple is caused to lag behind 90 ° of main circuit output current ripple, therefore in order to make
Ripple suppression circuit output compensation current phase and main circuit output current phase is on the contrary, the corresponding number of phase-detection point A, B, C
The reading order of group a [N] should be a [0] → a [1] ... a [360].
Particularly, specific Ripple Suppression strategy program process is as shown in Figure 5.
The foregoing is merely presently preferred embodiments of the present invention, all equivalent changes done according to scope of the present invention patent with
Modification, is all covered by the present invention.
Claims (7)
1. a kind of High Power Factor LED drive power low-frequency ripple suppressing method, it is characterised in that: provide AC power source, rectification
Circuit, single-stage power factor correcting circuit, LED load and ripple suppression circuit；The AC power source and the rectification circuit
Input terminal be connected, the positive and negative output end of rectification circuit respectively with the positive and negative input terminal of the single-stage power factor correcting circuit
It is connected, is LED load power supply together with the output-parallel of ripple suppression circuit by the output of single-stage power factor correcting circuit.
2. a kind of High Power Factor LED drive power low-frequency ripple suppressing method according to claim 1, feature exist
In: the ripple suppression circuit includes leakage inductance energy absorbing circuit and flyback converter；The input terminal of leakage inductance energy absorbing circuit
It is connected with the transformer primary winding in single-stage power factor correcting circuit, to absorb by single-stage power factor correcting circuit
The due to voltage spikes that generates of transformer leakage inductance, the output end of leakage inductance energy absorbing circuit is connected with flyback converter input terminal, institute
The output end of flyback converter and the output-parallel of single-stage power factor correcting circuit are stated, is connected to LED load together；
By the duty ratio of switching tube in control flyback converter, so that ripple suppression circuit generates one and single-level power factor
Correcting circuit exports that electric current low-frequency ripple is equal in magnitude, ripple compensation signal of opposite in phase, to inhibit LED light electric current
Low-frequency ripple, and leakage inductance energy is made to be utilized effectively.
3. a kind of High Power Factor LED drive power low-frequency ripple suppressing method according to claim 2, feature exist
In: the leakage inductance energy absorbing circuit includes the first clamp diode D1, the second clamp diode D2 and clamp capacitor C1,
The anode of the anode of the first clamp diode D1 and the second clamp diode D2 absorb electricity as the leakage inductance energy
The cathode of the input terminal on road, the first clamp diode D1 is connected with the cathode of the second clamp diode D2, and is connected to pincers
One end of position capacitor C1；The other end of the clamp capacitor C1 is connected to the negative output terminal of rectification circuit；The clamp capacitor C1
Output end of the both ends as the leakage inductance energy absorbing circuit；
The flyback converter includes transformer T2, switching tube S3 and diode D3；The primary side different name end of the transformer T2
It is connected to the drain electrode of switching tube S3, the original side of the same name of the source electrode of the switching tube S3 and the transformer T2 are as inverse-excitation converting
The input terminal of device；The secondary side Same Name of Ends of the transformer T2 is connected to the anode of the diode D3, the pair of the transformer T2
Output end of the cathode of side different name end and the diode D3 as flyback converter.
4. a kind of High Power Factor LED drive power low-frequency ripple suppressing method according to claim 3, feature exist
In: the duty ratio by switching tube in control flyback converter, so that ripple suppression circuit generates one and single stage power
Factor correcting circuit exports that electric current low-frequency ripple is equal in magnitude, ripple compensation signal of opposite in phase specifically: sets inverse-excitation converting
The duty ratio of device are as follows:
D=KD*a[N]；
In formula, KDFor flyback converter switching tube duty ratio coefficient, a [N] is the Function Array of sine transform；By detecting clamper
The voltage of capacitor obtains duty ratio COEFFICIENT KD, and then flyback converter duty ratio size is adjusted, control output ripple compensates electric current
Amplitude；Phase information is obtained by detection output current ripple, the reading order by changing array a [N] adjusts flyback and becomes
Parallel operation duty ratio waveform phase, to control the phase of output ripple compensation electric current.
5. a kind of High Power Factor LED drive power low-frequency ripple suppressing method according to claim 4, feature exist
In: sampled signal V is obtained after clamp capacitor voltage is sampledcf, with reference voltage VrefCompare, adjusts, obtain by internal PI program
To flyback converter switching tube duty ratio COEFFICIENT KD；Output electric current obtains sampled signal V after over-samplingif, straight with output electric current
Flow component signal VifdcCompare, obtains output current ripple signal Vrip, and control signal N is obtained by phase-detection, determine number
The reading order of group a [N], thus to obtain flyback transformer switching tube duty ratio D=KD*a[N]。
6. a kind of High Power Factor LED drive power low-frequency ripple suppressing method according to claim 4, feature exist
In: the duty ratio COEFFICIENT KDAdjusting, need to meet claimed below:
Ripple suppression circuit can provide enough compensation energy, i.e. the input power of ripple suppression circuit is equal to output power；When
When ripple suppression circuit input power increases, duty ratio COEFFICIENT KDBecome larger, the amplitude of ripple compensation electric current becomes larger, and output power increases
Add；When input power reduces, duty ratio COEFFICIENT KDBecome smaller, the amplitude of ripple compensation electric current also becomes smaller, and output power reduces；
Ripple suppression circuit does not influence main circuit and realizes power factor emendation function when working.
7. a kind of High Power Factor LED drive power low-frequency ripple suppressing method according to claim 6, feature exist
In: the ripple suppression circuit does not influence main circuit and realizes power factor emendation function when working specifically: by controlling clamper
The voltage of capacitor is consistently greater than the original edge voltage of the transformer in single-stage power factor correcting circuit, so that ripple suppression circuit work
The power factor emendation function of single-stage power factor correcting circuit is not influenced when making.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811587273.5A CN109496016B (en) | 2018-12-25 | 2018-12-25 | Low-frequency ripple suppression method for high-power-factor LED driving power supply |
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| CN201811587273.5A CN109496016B (en) | 2018-12-25 | 2018-12-25 | Low-frequency ripple suppression method for high-power-factor LED driving power supply |
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