CN109496016B - Low-frequency ripple suppression method for high-power-factor LED driving power supply - Google Patents
Low-frequency ripple suppression method for high-power-factor LED driving power supply Download PDFInfo
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Abstract
The invention relates to a low-frequency ripple suppression method of a high-power-factor LED driving power supply, which comprises the steps of providing an alternating current power supply, a rectifying circuit, a single-stage power factor correction circuit, an LED load and a ripple suppression circuit; the alternating current power supply is connected with the input end of the rectifying circuit, the positive output end and the negative output end of the rectifying circuit are respectively connected with the positive input end and the negative input end of the single-stage power factor correction circuit, and the output of the single-stage power factor correction circuit and the output of the ripple suppression circuit are connected in parallel to supply power for the LED load. The invention can inhibit the low-frequency ripple of the LED lamp current and effectively utilize the leakage inductance energy.
Description
Technical Field
The invention relates to the field of LED driving power supplies, in particular to a low-frequency ripple suppression method of a high-power-factor LED driving power supply.
Background
The LED becomes a new generation of green illumination light source with the advantages of energy conservation, environmental protection, high efficiency, long service life and the like. With the increasing maturity of LED lighting technology, it will be widely applied to various fields. In the AC power supply occasion, in order to meet the harmonic requirement of IEC61000-3-2, the LED driving power supply needs to carry out power factor correction.
The LED driving power supply with the power factor correction function may be divided into a single-stage circuit topology and a two-stage circuit topology according to the topology structure form thereof. The two-stage circuit topology generally adopts the circuit structures of a Boost-PFC converter and a DC/DC converter, the front stage Boost-PFC converter realizes the function of power factor correction, and the rear stage DC/DC converter realizes the constant current control of an LED lamp. The single-stage circuit topology has the advantages of simple structure, low cost, high power factor, high efficiency and the like, and is widely applied to low-power occasions, however, the output current of the single-stage power factor LED driving circuit has large low-frequency ripples due to the fact that instantaneous input power and constant output power are unbalanced, and the stroboscopic problem occurs when the LED works. Therefore, a low ripple LED driving power supply with PFC capability becomes a research hotspot.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a method for suppressing low-frequency ripples of a high power factor LED driving power supply, which can suppress low-frequency ripples of a lamp current of an LED and effectively utilize leakage inductance energy.
The invention is realized by adopting the following scheme: a low-frequency ripple suppression method for a high-power-factor LED driving power supply comprises providing an alternating current power supply, a rectifying circuit, a single-stage power factor correction circuit, an LED load and a ripple suppression circuit; the alternating current power supply is connected with the input end of the rectifying circuit, the positive output end and the negative output end of the rectifying circuit are respectively connected with the positive input end and the negative input end of the single-stage power factor correction circuit, and the output of the single-stage power factor correction circuit and the output of the ripple suppression circuit are connected in parallel to supply power for the LED load.
Further, the ripple suppression circuit comprises a leakage inductance energy absorption circuit and a flyback converter; the input end of the leakage inductance energy absorption circuit is connected with a primary winding of a transformer in the single-stage power factor correction circuit and is used for absorbing a voltage peak generated by the leakage inductance of the transformer in the single-stage power factor correction circuit, the output end of the leakage inductance energy absorption circuit is connected with the input end of a flyback converter, and the output end of the flyback converter is connected with the output of the single-stage power factor correction circuit in parallel and is connected to an LED load together;
by controlling the duty ratio of a switching tube in the flyback converter, the ripple suppression circuit generates a ripple compensation signal which has the same size and opposite phase with the low-frequency ripple of the output current of the single-stage power factor correction circuit, so that the low-frequency ripple of the LED lamp current is suppressed, and the leakage inductance energy is effectively utilized.
Further, the leakage inductance energy absorption circuit comprises a first clamping diode D1, a second clamping diode D2 and a clamping capacitor C1, wherein the anode of the first clamping diode D1 and the anode of the second clamping diode D2 are used as input ends of the leakage inductance energy absorption circuit, and the cathode of the first clamping diode D1 is connected with the cathode of the second clamping diode D2 and connected to one end of the clamping capacitor C1; the other end of the clamping capacitor C1 is connected to the negative output end of the rectifying circuit; two ends of the clamping capacitor C1 are used as the output end of the leakage inductance energy absorption circuit;
the flyback converter comprises a transformer T2, a switching tube S3 and a diode D3; the primary different-name end of the transformer T2 is connected to the drain electrode of a switch tube S3, and the source electrode of the switch tube S3 and the primary same-name end of the transformer T2 are used as the input end of a flyback converter; the dotted terminal of the secondary side of the transformer T2 is connected to the anode of the diode D3, and the dotted terminal of the secondary side of the transformer T2 and the cathode of the diode D3 serve as output terminals of the flyback converter.
Further, by controlling the duty ratio of the switching tube in the flyback converter, the ripple suppression circuit generates a ripple compensation signal with the same magnitude and opposite phase with the low-frequency ripple of the output current of the single-stage power factor correction circuit, specifically: the duty ratio of the flyback converter is set as:
D＝KD*a[N]；
in the formula, KDIs the duty ratio coefficient of the switching tube of the flyback converter, aN]Is a function array of sine transformation; obtaining duty ratio coefficient K by detecting voltage of clamping capacitorDFurther adjusting the duty ratio of the flyback converter and controlling the amplitude of the ripple compensation current output by the flyback converter; obtaining phase information by detecting LED lamp current ripple, and changing array a [ N ]]The reading sequence of the control unit adjusts the waveform phase of the duty ratio of the flyback converter, thereby controlling the phase of the output ripple compensation current of the flyback converter;
further, the voltage of the clamping capacitor is sampled to obtain a sampling signal VcfWith a reference voltage VrefComparing, and adjusting through an internal PI program to obtain a duty ratio coefficient K of a switching tube of the flyback converterD(ii) a The LED lamp current is sampled to obtain a sampling signal VifAnd DC component signal V of LED lamp currentifdcComparing to obtain the ripple signal V of the LED lamp currentripAnd obtaining a control signal N through phase detection to determine an array a [ N ]]So as to obtain the duty ratio D of the switching tube of the flyback transformer as KD*a[N]。
Further, the duty ratio coefficient KDThe following requirements need to be met:
the ripple suppression circuit can provide enough compensation energy, namely the input power of the ripple suppression circuit is equal to the output power; when the input power of the ripple suppression circuit is increased, the duty ratio coefficient KDThe amplitude of the ripple compensation current is increased, and the output power is increased; the duty factor K is reduced when the input power is reducedDThe amplitude of the ripple compensation current is reduced, and the output power is reduced;
the ripple suppression circuit does not influence the main circuit to realize the power factor correction function when working.
Further, when the ripple suppression circuit works, the function of the main circuit for realizing the power factor correction is not affected specifically as follows: the voltage of the clamping capacitor is controlled to be always larger than the primary voltage of the transformer in the single-stage power factor correction circuit, so that the power factor correction function of the single-stage power factor correction circuit is not influenced when the ripple suppression circuit works.
Compared with the prior art, the invention has the following beneficial effects: according to the invention, the duty ratio of the switching tube of the flyback converter is controlled, so that the ripple suppression circuit generates a ripple compensation signal which has the same size and opposite phase with the low-frequency ripple of the output current of the single-stage power factor correction circuit, thereby suppressing the low-frequency ripple of the LED lamp current and effectively utilizing the leakage inductance energy. Its advantages are high effect, high power factor and no stroboflash.
Drawings
Fig. 1 is a schematic diagram of a control circuit according to an embodiment of the present invention.
Fig. 2 is a block diagram of the ripple suppression control according to the embodiment of the present invention.
Fig. 3 is a waveform diagram of duty ratios of switching tubes of the flyback converter under different reading sequences according to the embodiment of the present invention.
Fig. 4 is a schematic diagram of phase detection according to an embodiment of the present invention.
Fig. 5 is a flowchart of a ripple reduction strategy procedure according to an embodiment of the present invention.
Detailed Description
The invention is further explained below with reference to the drawings and the embodiments.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As shown in fig. 1, the present embodiment provides a method for suppressing low-frequency ripple of a high power factor LED driving power supply, which includes providing an ac power supply, a rectifier circuit, a single-stage power factor correction circuit, an LED load, and a ripple suppression circuit; the alternating current power supply is connected with the input end of the rectifying circuit, the positive output end and the negative output end of the rectifying circuit are respectively connected with the positive input end and the negative input end of the single-stage power factor correction circuit, and the output of the single-stage power factor correction circuit and the output of the ripple suppression circuit are connected in parallel to supply power for the LED load.
In this embodiment, the ripple suppression circuit includes a leakage inductance energy absorption circuit and a flyback converter; the input end of the leakage inductance energy absorption circuit is connected with a primary winding of a transformer in the single-stage power factor correction circuit and is used for absorbing a voltage peak generated by the leakage inductance of the transformer in the single-stage power factor correction circuit, the output end of the leakage inductance energy absorption circuit is connected with the input end of a flyback converter, and the output end of the flyback converter is connected with the output of the single-stage power factor correction circuit in parallel and is connected to an LED load together;
by controlling the duty ratio of a switching tube in the flyback converter, the ripple suppression circuit generates a ripple compensation signal which has the same size and opposite phase with the low-frequency ripple of the output current of the single-stage power factor correction circuit, so that the low-frequency ripple of the LED lamp current is suppressed, and the leakage inductance energy is effectively utilized.
In this embodiment, the leakage inductance energy absorption circuit includes a first clamping diode D1, a second clamping diode D2, and a clamping capacitor C1, an anode of the first clamping diode D1 and an anode of the second clamping diode D2 are used as input terminals of the leakage inductance energy absorption circuit, and a cathode of the first clamping diode D1 is connected to a cathode of the second clamping diode D2 and to one end of the clamping capacitor C1; the other end of the clamping capacitor C1 is connected to the negative output end of the rectifying circuit; two ends of the clamping capacitor C1 are used as the output end of the leakage inductance energy absorption circuit;
the flyback converter comprises a transformer T2, a switching tube S3 and a diode D3; the primary different-name end of the transformer T2 is connected to the drain electrode of a switch tube S3, and the source electrode of the switch tube S3 and the primary same-name end of the transformer T2 are used as the input end of a flyback converter; the dotted terminal of the secondary side of the transformer T2 is connected to the anode of the diode D3, and the dotted terminal of the secondary side of the transformer T2 and the cathode of the diode D3 serve as output terminals of the flyback converter.
In this embodiment, the duty ratio of the switching tube in the flyback converter is controlled, so that the ripple suppression circuit generates a ripple compensation signal having the same magnitude and opposite phase to the low-frequency ripple of the output current of the single-stage power factor correction circuit, specifically: the duty ratio of the flyback converter is set as:
D＝KD*a[N]；
in the formula, KDIs the duty ratio coefficient of the switching tube of the flyback converter, aN]Is a function array of sine transformation; obtaining duty ratio coefficient K by detecting voltage of clamping capacitorDFurther adjust the duty ratio of the flyback converterControlling the amplitude of the ripple compensation current output by the flyback converter; obtaining phase information by detecting LED current ripple by changing array a [ N ]]The reading sequence of the control unit adjusts the waveform phase of the duty ratio of the flyback converter, thereby controlling the phase of the output ripple compensation current of the flyback converter;
the ripple rejection control schematic diagram is shown in fig. 2, where uC1To clamp the capacitor voltage, iLEDTo output a current, KCFor clamping the capacitor voltage sampling coefficient, KiIn order to output the current sampling coefficient, the duty ratio D of the output of the ripple suppression circuit is equal to KD*a[N],KDIs the duty factor, a [ N ]]The function array is a function array of sine conversion and is used for controlling the work of a switching tube of the flyback converter. The amplitude and the phase of the compensating current ripple output by the flyback converter are controlled, so that the ripple compensating circuit generates a ripple compensating signal which has the same size and the opposite phase with the low-frequency ripple of the output current of the single-stage power factor correction circuit, and the low-frequency ripple of the LED lamp current is restrained.
In this embodiment, the voltage of the clamp capacitor is sampled to obtain a sampling signal VcfWith a reference voltage VrefComparing, and adjusting through an internal PI program to obtain a duty ratio coefficient K of a switching tube of the flyback converterD(ii) a The LED lamp current is sampled to obtain a sampling signal VifAnd DC component signal V of LED lamp currentifdcComparing to obtain the ripple signal V of the LED lamp currentripAnd obtaining a control signal N through phase detection to determine an array a [ N ]]So as to obtain the duty ratio D of the switching tube of the flyback transformer as KD*a[N]。
In this embodiment, the duty ratio KDThe following requirements need to be met:
the ripple suppression circuit can provide enough compensation energy, namely the input power of the ripple suppression circuit is equal to the output power; when the input power of the ripple suppression circuit is increased, the duty ratio coefficient KDThe amplitude of the ripple compensation current is increased, and the output power is increased; the duty factor K is reduced when the input power is reducedDThe amplitude of the ripple compensating current is reduced, and the output power is reducedSmall;
the ripple suppression circuit does not influence the main circuit to realize the power factor correction function when working.
In this embodiment, the function of the ripple suppression circuit that does not affect the main circuit to realize the power factor correction function when operating specifically includes: the voltage of the clamping capacitor is controlled to be always greater than the primary voltage of the transformer in the single-stage power factor correction circuit, so that the power factor correction function of the single-stage power factor correction circuit is not influenced when the ripple suppression circuit works; even if the capacitor voltage V is clampedC1Is always greater than the primary voltage nV of the transformer T10I.e. VC1＞nVo。
In particular, the reading sequence of the array a [ N ] can adjust the waveform phase of the duty cycle of the flyback converter, and fig. 3 shows the duty cycle waveform of the switching tube of the flyback converter under several different reading sequences. Wherein, (a) is a standard array a [ N ] linearization curve, when the reading sequence is a [0] → a [1].. a [360], the duty cycle waveform of the switching tube of the flyback converter is as shown in (b) in fig. 3, and at this time, the duty cycle can be expressed as:
a [360] → a [ 0.. a [89], when the reading sequence is a [90] → a [91].. a [360] → a [0]. a [89], the flyback converter switching tube duty cycle waveform is as shown in (c) of fig. 3, and the duty cycle can be expressed as:
a [360] → a [0]. a [179], when the read sequence is a [180] → a [181]. a [360] → a [0]. a [179], the flyback converter switching tube duty cycle waveform is as shown in fig. 3 (d), and the duty cycle can be expressed as:
by changing the array a [ N ]]Is read byThe order can be selected to adjust the waveform phase of the duty ratio of the flyback converter, and the array a [ N ]]The number N of data contained is 360, so there are 360 different reading sequences, the reading sequence is given by the phase detection procedure, and the phase detection schematic is shown in fig. 4. Wherein iLEDripFor output current ripple, i1And D is the duty cycle waveform of a switching tube of the flyback converter of the ripple suppression circuit. In order to improve the ripple phase detection accuracy, the slope of the selected phase detection point should be larger, so the phase detection point selected in this embodiment is A, B, C points. Because of the equivalent impedance of the circuit output under the condition of twice power frequency
The LED current ripple is caused to lag behind the main circuit output current ripple by 90 °, so that the phase of the output compensation current of the ripple reduction circuit is opposite to the phase of the output current of the main circuit, the phase detection point A, B, C corresponds to the array a [ N [ ]]Should be a [0] in the read order]→a[1]......a[360]。
In particular, a specific ripple reduction strategy program flow is shown in fig. 5.
The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the present invention.
Claims (3)
1. A low-frequency ripple suppression method for a high-power-factor LED driving power supply is characterized by comprising the following steps: providing an alternating current power supply, a rectifying circuit, a single-stage power factor correction circuit, an LED load and a ripple suppression circuit; the alternating current power supply is connected with the input end of the rectifying circuit, the positive output end and the negative output end of the rectifying circuit are respectively connected with the positive input end and the negative input end of the single-stage power factor correction circuit, and the output of the single-stage power factor correction circuit and the output of the ripple suppression circuit are connected in parallel to supply power for the LED load;
the ripple suppression circuit comprises a leakage inductance energy absorption circuit and a flyback converter; the input end of the leakage inductance energy absorption circuit is connected with a primary winding of a transformer in the single-stage power factor correction circuit and is used for absorbing a voltage peak generated by the leakage inductance of the transformer in the single-stage power factor correction circuit, the output end of the leakage inductance energy absorption circuit is connected with the input end of a flyback converter, and the output end of the flyback converter is connected with the output of the single-stage power factor correction circuit in parallel and is connected to an LED load together;
by controlling the duty ratio of a switching tube in the flyback converter, the ripple suppression circuit generates a ripple compensation signal which has the same size and opposite phase with the low-frequency ripple of the output current of the single-stage power factor correction circuit, so that the low-frequency ripple of the LED load current is suppressed, and the leakage inductance energy is effectively utilized;
the leakage inductance energy absorption circuit comprises a first clamping diode D1, a second clamping diode D2 and a clamping capacitor C1, wherein the anode of the first clamping diode D1 and the anode of the second clamping diode D2 are used as input ends of the leakage inductance energy absorption circuit, and the cathode of the first clamping diode D1 is connected with the cathode of the second clamping diode D2 and connected to one end of the clamping capacitor C1; the other end of the clamping capacitor C1 is connected to the negative output end of the rectifying circuit; two ends of the clamping capacitor C1 are used as the output end of the leakage inductance energy absorption circuit;
the flyback converter comprises a transformer T2, a switching tube S3 and a diode D3; the primary different-name end of the transformer T2 is connected to the drain electrode of a switch tube S3, and the source electrode of the switch tube S3 and the primary same-name end of the transformer T2 are used as the input end of a flyback converter; the dotted terminal of the secondary side of the transformer T2 is connected to the anode of the diode D3, and the dotted terminal of the secondary side of the transformer T2 and the cathode of the diode D3 are used as the output end of the flyback converter;
the ripple suppression circuit generates a ripple compensation signal which has the same magnitude and opposite phase with the low-frequency ripple of the output current of the single-stage power factor correction circuit by controlling the duty ratio of a switching tube in the flyback converter, and the ripple compensation signal specifically comprises: the duty ratio of the flyback converter is set as:
D＝KD*a[N]；
in the formula, KDIs the duty ratio coefficient of the switching tube of the flyback converter, aN]Is a function array of sine transformation;the duty ratio K is obtained by detecting the voltage of the clamping capacitor C1DFurther adjusting the duty ratio of the flyback converter and controlling the amplitude of the ripple compensation current output by the flyback converter; obtaining phase information by detecting LED load current ripple by changing array a [ N ]]The reading sequence of the control unit adjusts the waveform phase of the duty ratio of the flyback converter, thereby controlling the phase of the output ripple compensation current of the flyback converter;
wherein, the voltage of the clamping capacitor C1 is sampled to obtain a sampling signal VcfWith a reference voltage VrefComparing, and adjusting through an internal PI program to obtain a duty ratio coefficient K of a switching tube of the flyback converterD(ii) a Sampling LED load current to obtain sampling signal Vifd.C. component signal V corresponding to LED load currentifdcComparing to obtain LED load current ripple signal VripAnd obtaining a control signal N through phase detection to determine an array a [ N ]]So as to obtain the duty ratio D of the switching tube of the flyback transformer as KD*a[N]。
2. The method for suppressing the low-frequency ripple of the high-power-factor LED driving power supply according to claim 1, wherein: the duty ratio coefficient KDThe following requirements need to be met:
the ripple suppression circuit can provide enough compensation energy, namely the input power of the ripple suppression circuit is equal to the output power; when the input power of the ripple suppression circuit is increased, the duty ratio coefficient KDThe amplitude of the ripple compensation current is increased, and the output power is increased; the duty factor K is reduced when the input power is reducedDThe amplitude of the ripple compensation current is reduced, and the output power is reduced;
the ripple suppression circuit does not influence the main circuit to realize the power factor correction function when working.
3. The method for suppressing the low-frequency ripple of the high-power-factor LED driving power supply according to claim 2, wherein: the ripple suppression circuit does not influence the main circuit to realize the power factor correction function during working, and the power factor correction function is specifically as follows: the voltage of the clamping capacitor C1 is controlled to be always larger than the primary voltage of the transformer in the single-stage power factor correction circuit, so that the power factor correction function of the single-stage power factor correction circuit is not influenced when the ripple suppression circuit works.
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