CN102624214B - Circuit and method for controlling constant current of high-power-factor buck-boost switch converter - Google Patents
Circuit and method for controlling constant current of high-power-factor buck-boost switch converter Download PDFInfo
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- CN102624214B CN102624214B CN201210103298.XA CN201210103298A CN102624214B CN 102624214 B CN102624214 B CN 102624214B CN 201210103298 A CN201210103298 A CN 201210103298A CN 102624214 B CN102624214 B CN 102624214B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses a method and a circuit for controlling constant current of a high-power-factor buck-boost switch converter. The method for controlling constant current of a high-power-factor buck-boost switch converter includes the following steps of (1) detecting a drain voltage of an MOS (metal oxide semiconductor) transistor by designing a FB (feedback) pin of a power switch controller B1; (2) establishing a certain proportional relationship by proportioning voltage of the FB pin and the drain voltage of the MOS transistor to enable the power switch controller B1 to run in a fixed-frequency discontinuous conduction mode; (3) obtaining high power-factor correction by adjusting a compensation capacitor C2; and (4) controlling the constant output current by maintaining constant proportion between a discharging time of a secondary diode D1 and a switching period, wherein the discharging time of the secondary diode is timed from the discharging beginning to the full discharging end.
Description
Technical field
The present invention relates to buck-boost type switch converters control constant current output, relate in particular to the current drives for LED by the output of buck-boost type switch converters control current constant.
Background technology
LED illumination is widely used in enterprise's illumination, business application illumination and residential lighting.In recent years, increasing light on, is used LED lighting device, and many countries have also all formulated the timetable of progressively eliminating traditional incandescent light fitting, and remaining selection is exactly electricity-saving lamp and LED lamp.Compared with the incandescent lamp of equal illumination effect, electricity-saving lamp can be saved more electric power, but it contains mercury metallic element interior, can cause very large pollution to environment.In addition,, compared with LED lamp, be limited the useful life of electricity-saving lamp.The development of LED lamp is very fast, needs the control of constant current output.At present, LED lighting requires to exchange direct input, high efficiency, High Power Factor, long service life.With reference to figure 1, traditional buck-boost type switch converters can be used for driving LED lamp, according to different application demands, V
iNand PV
iNpin can link together, and also can separately connect.BUCK-BOOST (buck-boost type) pattern is the output current for regulating LED lamp, and the large electrochemical capacitor C3 of input can guarantee high input voltage.Because PV
iNleads ends has connected large input electrochemical capacitor, and the power factor exchanging in input application is very low.In addition,, in the application of high alternating current input, the output current control of LED lamp also exists problem.
With reference to figure 2, buck-boost type switch converters can carry out change in voltage in induction line to obtain High Power Factor by input voltage voltage divider in the time of driving LED lamp.This converter can detect the variation of input voltage, thereby the duty ratio of adjusting MOS switching tube grid is to adapt to the variation of input voltage, so just can obtain High Power Factor.But two kinds of methods that Fig. 1 and Fig. 2 show all can not be controlled the constant current output of LED lamp easily.
Summary of the invention
For above-mentioned technological deficiency, the present invention proposes a kind of High Power Factor buck-boost type switch converters control constant-current circuit and method.
In order to solve the problems of the technologies described above, technical scheme of the present invention is as follows;
A kind of High Power Factor buck-boost type switch converters control constant-current circuit, comprise inductance L 1, metal-oxide-semiconductor mains switch, power supply switch controller B1, sustained diode 1, output filter capacitor C1, described power supply switch controller B1 comprises the first sampling circuit S/H, the second sampling circuit S/H, SR latch circuit, reference voltage circuit V
rEF, amplifier circuit A1, error amplify comparison circuit A3, comparison circuit A2, pierce circuit, drive circuit;
Described the first sampling circuit S/H output connects a R end of described SR latch circuit and one end that described error is amplified comparison circuit A3 simultaneously, the input FB of described the first sampling circuit S/H is connected to ground connection between resistance R 5 and resistance R 4 and after described resistance R 5, after described resistance R 4, connects the drain electrode of positive terminal and the described metal-oxide-semiconductor mains switch of described inductance L 1, described sustained diode 1, described reference voltage circuit V
rEFconnect described error and amplify the positive pole of comparison circuit A3, the negative pole of described error amplification comparison circuit A3 connects the output of described amplifying circuit A1, the input of described amplifying circuit A1 connects the output of the second sampling circuit S/H, input one end GND ground connection of described the second sampling circuit S/H, other end CS is connected to described metal-oxide-semiconductor mains switch source electrode and resistance R
sENSEbetween, the output of described SR latch circuit connects the input of drive circuit, the output GATE end of described drive circuit connects the grid of described metal-oxide-semiconductor mains switch, the output that described error is amplified comparison circuit A3 connects the negative pole of described comparison circuit A2 and one end of capacitor C 2 simultaneously, one end of the anodal connection oscillator circuit of described comparison circuit A2, the output of described comparison circuit A2 connects the 2nd R end of described SR latch circuit, and the S end of described SR latch circuit connects the other end of described pierce circuit.
Further, described power supply switch controller B1 also comprises the second comparison circuit A4 and current detection circuit, and described the second comparison circuit A4 connects the 3rd R end that connects described SR latch circuit after described current detection circuit.
Further, described power supply switch controller B1 also comprises electric voltage over press protective circuit, and described electric voltage over press protective circuit is connected between a R end of described the first sampling circuit output and described SR latch circuit.
A kind of High Power Factor buck-boost type switch converters control constant current method, detect the drain voltage of described metal-oxide-semiconductor by a pin FB of designing power supply on-off controller B1, the drain voltage of described FB pin voltage and described metal-oxide-semiconductor is formed to certain proportionate relationship, power supply switch controller B1 is operated under fixed frequency discontinuous conduction mode, by regulating described building-out capacitor C2 to obtain high power factor correction, constant output current starts to discharge into that the constant ratio of time till complete discharge off and switch periods reaches by maintaining described secondary diode D1.
Accompanying drawing explanation
Fig. 1 is traditional buck-boost type switch converters;
Fig. 2 is the buck-boost type switch converters with High Power Factor;
Fig. 3 is the constant current output buck-boost type switch converters with High Power Factor of the present invention;
Fig. 4 is the waveform schematic diagram that detects MOS switching tube drain voltage;
Fig. 5 is the circuit diagram of realizing of the present invention.
Embodiment
As shown in Figure 3, the present invention has set a constant switching frequency, thereby has reduced the difficulty of design inductance parameters.The present invention has also eliminated input voltage voltage divider, the substitute is, it by the voltage detecting of the FB leads ends of power supply switch controller B1 by being connected to SW end points (drain electrode of metal-oxide-semiconductor).Thereby FB pin voltage forms certain proportionate relationship with SW end-point voltage, this converter is operated under DCM (discontinuous conducting) pattern.FB pin has double action: 1) detection power MOS switching tube closes the discharging current of the inductance of having no progeny, until electric current is zero; 2) open-circuit condition of detection LED, this automatic protection to fault is very favourable.The large electrochemical capacitor of input is eliminated, to obtain High Power Factor.The COMP pin of power supply switch controller B1 has connected variation that a sufficiently high building-out capacitor adapts to input voltage to obtain high power factor.The selection of building-out capacitor makes the inverse of time constant of COMP pin suitable with the frequency of input line voltage, and it has determined whether High Power Factor can be realized.
Embodiment mono-
Fig. 5 is the specific implementation of Fig. 3 buck-boost type switch converters control constant current output circuit, a kind of High Power Factor buck-boost type switch converters control constant-current circuit, comprise inductance L 1, metal-oxide-semiconductor mains switch, power supply switch controller B1, sustained diode 1, output filter capacitor C1, described power supply switch controller B1 comprises the first sampling circuit S/H, the second sampling circuit S/H, SR latch circuit, reference voltage circuit V
rEF, amplifier circuit A1, error are amplified comparison circuit A3, comparison circuit A2, pierce circuit, drive circuit; Described the first sampling circuit S/H output connects a R end of described SR latch circuit and one end that described error is amplified comparison circuit A3 simultaneously, the input FB of described the first sampling circuit S/H is connected to ground connection between resistance R 5 and resistance R 4 and after described resistance R 5, after described resistance R 4, connects the drain electrode of positive terminal and the described metal-oxide-semiconductor mains switch of described inductance L 1, described sustained diode 1, described reference voltage circuit V
rEFconnect described error and amplify the positive pole of comparison circuit A3, the negative pole of described error amplification comparison circuit A3 connects the output of described amplifying circuit A1, the input of described amplifying circuit A1 connects the output of the second sampling circuit S/H, input one end GND ground connection of described the second sampling circuit S/H, other end CS is connected to described metal-oxide-semiconductor mains switch source electrode and resistance R
sENSEbetween, the output of described SR latch circuit connects the input of drive circuit, the output GATE end of described drive circuit connects the grid of described metal-oxide-semiconductor mains switch, the output that described error is amplified comparison circuit A3 connects the negative pole of described comparison circuit A2 and one end of capacitor C 2 simultaneously, one end of the anodal connection oscillator circuit of described comparison circuit A2, the output of described comparison circuit A2 connects the 2nd R end of described SR latch circuit, and the S end of described SR latch circuit connects the other end of described pierce circuit.
Above-mentioned power supply switch controller B1 can also comprise the second comparison circuit A4 and current detection circuit ENABLE CONTROL, ENABLE CONTROL have the second comparison circuit A4 and current detection circuit in the time of design time, above-mentioned SR latch circuit will increase a R end, and described the second comparison circuit A4 connects that R end that SR latch circuit newly increases after connecting described current detection circuit ENABLE CONTROL.
For power supply switch controller B1 is carried out to overvoltage protection; can also comprise electric voltage over press protective circuit OVP in described power supply switch controller inside, described electric voltage over press protective circuit OVP is connected between a R end of described the first sampling circuit S/H output and described SR latch circuit.
Foregoing circuit specific works principle is: V
iNend is the power supply that is used to provide power-supply controller of electric B1, and FB end is (by the voltage divider of resistance R 4 and resistance R 5) of the voltage for detecting SW end, and the COMP end of this power-supply controller of electric B1 is for connecting building-out capacitor as high power factor correction.CS end is the electric current during for the conducting of sense switch pipe, and GATE end is that the grid for connecting outside connected switch pipe is used as driving.Electric current by MOS switching tube is amplified into error amplifier comparison circuit A3 and V by amplifying circuit A1 after CS holds the second sampling circuit S/H sampling
rEF(reference voltage) compares, result is relatively undertaken smoothly by the capacitor C 2 of holding at COMP, the slope of its voltage and oscillator compares at comparison circuit A2, obtains corresponding duty ratio, drives drive circuit DRIVER to remove driven MOS switching tube by the output of SR latch.The sampling voltage of FB end is used for connecting error amplifier comparison circuit A3, for regulating its output.
In conjunction with Fig. 4 and Fig. 5, in the time that this circuit working is under DCM pattern, secondary diode D1 electric current can fully discharge to the load output with LED, and the drain electrode crest voltage of power MOS switch tube is input voltage P
vINwith load LED diode drop sum.This discharge time (T
dISCHARGE) be defined as the time till secondary diode D1 starts to discharge into complete discharge off.In order to guarantee that constant current exports and have good control, constant switching frequency (being constant cycle T) in the situation that, guarantee T
dISCHARGE/ T is invariable is very important (the T is here illustrated in changeless switch periods in circuit).The time that secondary diode D1 discharges is completely that the trailing edge that the voltage divider held by FB detects the 3rd limit of transformer obtains.Controller B1 operates in fixed frequency DCM (discontinuous conducting) pattern to obtain high power factor correction.The constant output of electric current is by detecting T
dISCHARGE/ T and MOS switching tube sampled peak electric current are adjusted.Above-mentioned two class signals all can be transferred to an error and amplify comparison circuit A3, thereby allow the capacitor charge and discharge of COMP leads ends flow, and make the voltage at these electric capacity two ends make corresponding adjustment according to the signal of feedback.The output of error amplification comparison circuit A3 determines the duty ratio of fixed switching frequency together with oscillator, constant output current is by regulating duty recently to realize.
Above-mentioned execution mode is not only applicable to civil power input mode, and is applicable to the low-voltage alternating-current input mode of MR16 lamp.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, without departing from the inventive concept of the premise; can also make some improvements and modifications, these improvements and modifications also should be considered as in protection range of the present invention.
Claims (1)
1. a High Power Factor buck-boost type switch converters control constant-current circuit, comprise inductance L 1, metal-oxide-semiconductor mains switch, power supply switch controller B1, sustained diode 1, output filter capacitor C1, it is characterized in that, described power supply switch controller B1 comprises the first sampling circuit S/H, the second sampling circuit S/H, SR latch circuit, reference voltage circuit VREF, amplifier circuit A1, error amplification comparison circuit A3, comparison circuit A2, pierce circuit, drive circuit, described the first sampling circuit S/H output connects a R end of described SR latch circuit and the power end of described error amplification comparison circuit A3 simultaneously, the input FB of described the first sampling circuit S/H is connected to ground connection between resistance R 5 and resistance R 4 and after described resistance R 5, after described resistance R 4, connect described inductance L 1, the drain electrode of the positive terminal of described sustained diode 1 and described metal-oxide-semiconductor mains switch, described reference voltage circuit VREF connects the positive pole of described error amplification comparison circuit A3, the negative pole of described error amplification comparison circuit A3 connects the output of described amplifier circuit A1, the input of described amplifier circuit A1 connects the output of the second sampling circuit S/H, input one end GND ground connection of described the second sampling circuit S/H, other end CS is connected between described metal-oxide-semiconductor mains switch source electrode and resistance R SENSE, the output of described SR latch circuit connects the input of drive circuit, the output GATE end of described drive circuit connects the grid of described metal-oxide-semiconductor mains switch, the output that described error is amplified comparison circuit A3 connects the negative pole of described comparison circuit A2 and one end of capacitor C 2 simultaneously, the other end ground connection of capacitor C 2, one end of the anodal connection oscillator circuit of described comparison circuit A2, the output of described comparison circuit A2 connects the 2nd R end of described SR latch circuit, and the S end of described SR latch circuit connects the other end of described pierce circuit.
2. a kind of High Power Factor buck-boost type switch converters control constant-current circuit according to claim 1, it is characterized in that, described power supply switch controller B1 also comprises the second comparison circuit A4 and current detection circuit, and described the second comparison circuit A4 connects the 3rd R end that connects described SR latch circuit after described current detection circuit.
3. a kind of High Power Factor buck-boost type switch converters control constant-current circuit according to claim 1; it is characterized in that; described power supply switch controller B1 also comprises electric voltage over press protective circuit, and described electric voltage over press protective circuit is connected between a R end of described the first sampling circuit output S/H and described SR latch circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210103298.XA CN102624214B (en) | 2012-04-10 | 2012-04-10 | Circuit and method for controlling constant current of high-power-factor buck-boost switch converter |
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| CN201210103298.XA CN102624214B (en) | 2012-04-10 | 2012-04-10 | Circuit and method for controlling constant current of high-power-factor buck-boost switch converter |
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| CN102624214B true CN102624214B (en) | 2014-07-09 |
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| CN104427683A (en) * | 2013-08-22 | 2015-03-18 | 海洋王（东莞）照明科技有限公司 | Buck-boost drive circuit and illuminating lamp |
| CN104427699B (en) * | 2013-09-04 | 2018-11-13 | 海洋王（东莞）照明科技有限公司 | LED signal lamp and its LED drive circuit |
| CN103618472B (en) * | 2013-09-12 | 2016-01-20 | 复旦大学 | There is all solid state high voltage pulse current source that unipolar pulse exports |
| CN104821716B (en) * | 2014-01-30 | 2017-07-04 | 登丰微电子股份有限公司 | Constant on-time controller |
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| CN101883461A (en) * | 2010-06-09 | 2010-11-10 | 北京交通大学 | LED adaptive constant current controller with power factor correction function |
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| CN202565157U (en) * | 2012-04-10 | 2012-11-28 | 绍兴恒力特微电子有限公司 | Circuit for control of constant current by high-power-factor buck-boost switching converter |
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2012
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| US5757635A (en) * | 1995-12-28 | 1998-05-26 | Samsung Electronics Co., Ltd. | Power factor correction circuit and circuit therefor having sense-FET and boost converter control circuit |
| US5742151A (en) * | 1996-06-20 | 1998-04-21 | Micro Linear Corporation | Input current shaping technique and low pin count for pfc-pwm boost converter |
| US6259614B1 (en) * | 1999-07-12 | 2001-07-10 | International Rectifier Corporation | Power factor correction control circuit |
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Effective date of registration: 20160111 Address after: 266199, room 3, building 320, No. nine, No. 319 East water road, Licang District, Shandong, Qingdao Patentee after: Qingdao Yida Weiye Electronic Technology Co., Ltd. Address before: 312000 Zhejiang province Shaoxing City Shunjiang Road No. 683 Chong Building Room 1309 Patentee before: Shaoxing Halite Microelectronic Co., Ltd. |