CN202565166U - Fly-back converter control constant current output circuit - Google Patents
Fly-back converter control constant current output circuit Download PDFInfo
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- CN202565166U CN202565166U CN2012201366613U CN201220136661U CN202565166U CN 202565166 U CN202565166 U CN 202565166U CN 2012201366613 U CN2012201366613 U CN 2012201366613U CN 201220136661 U CN201220136661 U CN 201220136661U CN 202565166 U CN202565166 U CN 202565166U
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The present utility model discloses a fly-back converter control constant current output circuit. The circuit comprises a rectifier bridge for controlling rectification output, a transformer, an MOS tube power switch, a power switch controller B1, a secondary rectifier diode D1, an output filtering capacitor C6 and an output feedback third winding, the power switch controller B1 comprises a first sampling circuit, a second sampling circuit, an SR latch register circuit, a reference voltage circuit, an amplifier circuit A1, an error amplification and comparison circuit A3, a comparison circuit A2, an oscillator circuit and a driving circuit, and the design of an electromagnetic interference filter and a transformer is effectively simplified through constant PWM frequency; a high voltage input electrolytic capacitor, an input resistance voltage divider and an optical coupler are eliminated, thus service life is prolonged, and high power factor correction is provided; and the high power factor correction is obtained by input feedback voltage of the third winding and a compensation capacitor C4, not the input resistance voltage divider.
Description
Technical field
The utility model relates to anti exciting converter and drives constant current output, and the anti exciting converter that relates in particular to the driving that is used for the output of LED current constant drives constant current output circuit.
Background technology
The LED illumination has obtained using widely in enterprise's illumination, commercial application illumination and residential lighting.In recent years; Increasing light on, used the 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; Compare with the incandescent lamp of equal illumination effect; Electricity-saving lamp can be saved more electric power, but it contains the mercury metallic element interior, can cause very big pollution to environment.In addition, compare with the 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, the LED lighting requires to exchange direct input, high efficiency, High Power Factor, long service life.Traditional AC/DC anti exciting converter control constant current output circuit generally has three kinds; As shown in Figure 1; First kind of traditional AC/DC anti exciting converter control constant current output circuit regulated output voltage through optical coupler to the Voltage Feedback of power supply switch controller; It has used the high-pressure electrolysis electric capacity and the optical coupler of high appearance value, and this has just limited the useful life of whole system, and power factor also can be very low.And for example shown in Figure 2; Second kind of traditional AC/DC anti exciting converter control constant current output circuit eliminated optical coupler; And with the tertiary winding of transformer as feedback controller; It regulates output voltage through the induced voltage of the transformer tertiary winding, and high power factor correction realizes the detection and the elimination high-pressure electrolysis electric capacity of input voltage through the resitstance voltage divider that is connected Input voltage terminal.Like Fig. 3, the third traditional AC/DC anti exciting converter control constant current output circuit has also been eliminated optical coupler, and with the tertiary winding of transformer as feedback controller, it still regulates output voltage through the induced voltage of the transformer tertiary winding.High power factor correction is the realization recently of discharge time and total switch periods through detecting the secondary diode end.Switching frequency is fixing, but by determining that the changeability of switching frequency has increased the difficulty of design of transformer the discharge time of secondary diode end.
Summary of the invention
To above-mentioned technological deficiency, the utility model proposes a kind of anti exciting converter control constant current output circuit.
In order to solve the problems of the technologies described above, the technical scheme of the utility model is following;
A kind of anti exciting converter control constant current output circuit; The rectifier bridge, transformer, metal-oxide-semiconductor mains switch, power supply switch controller B1, secondary commutation diode D1, output filter capacitor C6, the output feedback tertiary winding that comprise control rectification output; Said power supply switch controller B1 comprises first sampling circuit, second sampling circuit, SR latch circuit, reference voltage circuit, amplifier circuit A1, error amplification comparison circuit A3, comparison circuit A2, pierce circuit, drive circuit;
The said first sampling circuit output connects the R end of said SR latch circuit and the end that said error is amplified comparison circuit A3 simultaneously; The input of said first sampling circuit connects the said output feedback tertiary winding through resistance; Said reference voltage circuit connects the positive pole that said error is amplified comparison circuit A3; The negative pole of said error amplification comparison circuit A3 connects the output of said amplifying circuit A1; The input of said amplifying circuit A1 connects the output of second sampling circuit; The input one end ground connection of said second sampling circuit, the other end is connected between metal-oxide-semiconductor mains switch and the resistance R 8, connects the grid of metal-oxide-semiconductor mains switch behind the output of the said SR latch circuit connection drive circuit; The output that said error is amplified comparison circuit A3 connects the negative pole of said comparison circuit A2 and an end of capacitor C 4 simultaneously; One end of the anodal connection oscillator circuit of said comparison circuit A2 and resistance R 5 back ground connection, the output of said comparison circuit A2 connects the 2nd R end of said SR latch circuit, and the S end of said SR latch circuit connects the other end of said pierce circuit.
Further, said power supply switch controller also comprises the electric voltage over press protective circuit, and said electric voltage over press protective circuit is connected between the R end of said first sampling circuit output and said SR latch circuit.
Further, said power supply switch controller also comprises second comparison circuit A4 and the current detection circuit, and the said second comparison circuit A4 connects the 3rd R end that connects said SR latch circuit behind the said current detection circuit.
The beneficial effect of the utility model is: constant PWM frequency has been simplified the design of EMI FILTER and transformer effectively; Eliminated high pressure input electrochemical capacitor, input resistance voltage divider and optocoupler, thus prolonged useful life, and high power factor correction is provided; The acquisition of high power factor correction is through the input feedback voltage of the tertiary winding and building-out capacitor C4 but not the input resistance voltage divider is realized.
Description of drawings
Fig. 1 is first kind of traditional AC/DC anti exciting converter;
Fig. 2 is second kind of traditional AC/DC anti exciting converter;
Fig. 3 is the third traditional AC/DC anti exciting converter;
Fig. 4 is the electrical block diagram of the utility model;
Fig. 5 is for detecting the waveform sketch map of secondary voltage;
Fig. 6 is the realization sketch map of the utility model.
Embodiment
To combine accompanying drawing and specific embodiment that the utility model is done further explanation below.
As shown in Figure 4; The utility model has been set a constant switching frequency; Thereby reduced the difficulty of design of transformer; Also simplified the design of peripheral circuit, this switching frequency is to regulate through outer meeting resistance in the peripheral circuit or built-in resistor, and transformer is operated in DCM (discontinuous conducting) pattern to obtain high power factor correction.The utility model need not utilize the resitstance voltage divider of input to detect the input waveform 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 that the frequency of inverse and input line voltage of time constant of COMP pin is suitable.It has determined whether High Power Factor can be realized.The output feedback is through elementary detection, and has eliminated optical coupling.
Embodiment one:
A kind of anti exciting converter control constant current output circuit; Similar with Fig. 3 peripheral circuit; The rectifier bridge, transformer, metal-oxide-semiconductor mains switch, power supply switch controller B1, secondary commutation diode D1, output filter capacitor C6, the output feedback tertiary winding that comprise control rectification output; Its difference has been to set a constant switching frequency; This switching frequency is to regulate through outer meeting resistance in the peripheral circuit or built-in resistor; Therefore original power supply switch controller adjustment that also will adapt to, like Fig. 4 and shown in Figure 6, said 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;
The said first sampling circuit S/H output connects the R end of said SR latch circuit and the end that said error is amplified comparison circuit A3 simultaneously; The input FB of the said first sampling circuit S/H connects the said output feedback tertiary winding, said reference voltage circuit V through resistance R 1
REFConnect said error and amplify the positive pole of comparison circuit A3; The negative pole of said error amplification comparison circuit A3 connects the output of said amplifying circuit A1; The input of said amplifying circuit A1 connects the output of second sampling circuit; The input one end GND ground connection of said second sampling circuit, other end CS is connected between metal-oxide-semiconductor mains switch and the resistance R 8, and the output of said SR latch circuit connects the input of drive circuit DRIVER; The output GATE end of DRIVER connects the grid of metal-oxide-semiconductor mains switch; For drive circuit DRIVER driving voltage is provided at the VCC of power supply switch controller end, the output that said error is amplified comparison circuit A3 connects the negative pole of said comparison circuit A2 and an end of capacitor C 4 simultaneously, an end of the anodal connection oscillator circuit of said comparison circuit A2 and resistance R 5 back ground connection; Resistance R 5 is the described by-pass cock frequency outer meeting resistance that is used for of the utility model; Link together through pierce circuit, make the concussion frequency of oscillator change, thereby transformer is operated in DCM (discontinuous conducting) pattern to obtain high power factor correction.The output of said comparison circuit A2 connects the 2nd R end of said SR latch circuit, and the S end of said SR latch circuit connects the other end of said 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 when in the time of design, the second comparison circuit A4 and current detection circuit being arranged; Above-mentioned SR latch circuit will increase a R end, and the said second comparison circuit A4 connects that R end that the SR latch circuit increases newly after connecting said current detection circuit ENABLE CONTROL.
For power supply switch controller B1 is carried out overvoltage protection; Can also comprise electric voltage over press protective circuit OVP in said power supply switch controller inside, said electric voltage over press protective circuit OVP is connected between the R end of said first sampling circuit S/H output and said SR latch circuit.
Concrete operation principle is: the VCC end is the power supply that is used to provide power-supply controller of electric, and the FB end is (through the voltage divider of R1 and R2) that is used for detecting the voltage of transformer the 3rd end, and it is to be used for connecting building-out capacitor as high power factor correction, R that COMP holds
TEnd is to connect outer meeting resistance to regulate the power-supply controller of electric switching frequency.CS end is the electric current when being used for the conducting of sense switch pipe, and the GATE end is that the grid that is used for connecting the outside connected switch pipe is used as driving.R
TOuter meeting resistance and pierce circuit link together, make the concussion frequency of oscillator change.Electric current through switching tube holds second sampling circuit S/H sampling back to be amplified into error amplifier comparison circuit A3 and V by amplifying circuit A1 through CS
REF(reference voltage) compares; Result is relatively undertaken smoothly by the capacitor C on the COMP end 4; The slope of its voltage and oscillator compares at comparison circuit A2, obtains corresponding duty ratio, drives driver DRIVER by the output of SR latch and removes the driving switch pipe.The sampling voltage of FB end is used for connecting error amplifier comparison circuit A3, is used to regulate its output.
As shown in Figure 5; When system works in DCM pattern following time; Secondary diode D1 electric current can fully discharge the load output of giving band LED, and the drain electrode crest voltage of power MOS pipe is the reflection output voltage and the turn ratio sum of products before input voltage and diode fully discharge.This discharge time (T
DISCHARGE) be defined as the time till secondary diode D1 begins to discharge into complete discharge off.In order to guarantee constant current output and better controlling to be arranged, under the situation of constant switching frequency (being constant cycle T), guarantee T
DISCHARGE/ T is invariable to be very important (the T here is illustrated in changeless switch periods in the system).The time that secondary diode D1 discharges fully is that the trailing edge that the voltage divider through FB end detects the 3rd limit of transformer obtains.
The above only is the preferred implementation of the utility model; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the utility model design; Can also make some improvement and retouching, these improvement and retouching also should be regarded as in the utility model protection range.
Claims (3)
1. an anti exciting converter is controlled constant current output circuit; The rectifier bridge, transformer, metal-oxide-semiconductor mains switch, power supply switch controller B1, secondary commutation diode D1, output filter capacitor C6, the output feedback tertiary winding that comprise control rectification output; It is characterized in that; Said power supply switch controller B1 comprises first sampling circuit, second sampling circuit, SR latch circuit, reference voltage circuit, amplifier circuit A1, error amplification comparison circuit A3, comparison circuit A2, pierce circuit, drive circuit;
The said first sampling circuit output connects the R end of said SR latch circuit and the end that said error is amplified comparison circuit A3 simultaneously; The input of said first sampling circuit connects the said output feedback tertiary winding through resistance; Said reference voltage circuit connects the positive pole that said error is amplified comparison circuit A3; The negative pole of said error amplification comparison circuit A3 connects the output of said amplifying circuit A1; The input of said amplifying circuit A1 connects the output of second sampling circuit; The input one end ground connection of said second sampling circuit, the other end is connected between metal-oxide-semiconductor mains switch and the resistance R 8, connects the grid of metal-oxide-semiconductor mains switch behind the output of the said SR latch circuit connection drive circuit; The output that said error is amplified comparison circuit A3 connects the negative pole of said comparison circuit A2 and an end of capacitor C 4 simultaneously; One end of the anodal connection oscillator circuit of said comparison circuit A2 and resistance R 5 back ground connection, the output of said comparison circuit A2 connects the 2nd R end of said SR latch circuit, and the S end of said SR latch circuit connects the other end of said pierce circuit.
2. a kind of anti exciting converter control constant current output circuit according to claim 1; It is characterized in that; Said power supply switch controller B1 also comprises the electric voltage over press protective circuit, and said electric voltage over press protective circuit is connected between the R end of said first sampling circuit output and said SR latch circuit.
3. a kind of anti exciting converter control constant current output circuit according to claim 1; It is characterized in that; Said power supply switch controller B1 also comprises second comparison circuit A4 and the current detection circuit, and the said second comparison circuit A4 connects the 3rd R end that connects said SR latch circuit behind the said current detection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201366613U CN202565166U (en) | 2012-04-01 | 2012-04-01 | Fly-back converter control constant current output circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201366613U CN202565166U (en) | 2012-04-01 | 2012-04-01 | Fly-back converter control constant current output circuit |
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| CN202565166U true CN202565166U (en) | 2012-11-28 |
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| CN2012201366613U Expired - Fee Related CN202565166U (en) | 2012-04-01 | 2012-04-01 | Fly-back converter control constant current output circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102611316A (en) * | 2012-04-01 | 2012-07-25 | 绍兴恒力特微电子有限公司 | Flyback converter controlled constant-current output circuit and method |
| CN103151928A (en) * | 2013-03-20 | 2013-06-12 | 深圳Tcl新技术有限公司 | Switching power supply circuit and constant power output method thereof |
| CN104185333A (en) * | 2013-05-20 | 2014-12-03 | 海洋王（东莞）照明科技有限公司 | Constant-current constant-voltage circuit and illuminating device |
-
2012
- 2012-04-01 CN CN2012201366613U patent/CN202565166U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102611316A (en) * | 2012-04-01 | 2012-07-25 | 绍兴恒力特微电子有限公司 | Flyback converter controlled constant-current output circuit and method |
| CN102611316B (en) * | 2012-04-01 | 2014-07-02 | 绍兴恒力特微电子有限公司 | Flyback converter controlled constant-current output circuit |
| CN103151928A (en) * | 2013-03-20 | 2013-06-12 | 深圳Tcl新技术有限公司 | Switching power supply circuit and constant power output method thereof |
| CN103151928B (en) * | 2013-03-20 | 2016-02-03 | 深圳Tcl新技术有限公司 | Switching power circuit and constant power output method thereof |
| CN104185333A (en) * | 2013-05-20 | 2014-12-03 | 海洋王（东莞）照明科技有限公司 | Constant-current constant-voltage circuit and illuminating device |
| CN104185333B (en) * | 2013-05-20 | 2016-09-28 | 海洋王（东莞）照明科技有限公司 | Constant-current constant-voltage circuit and illuminator |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121128 Termination date: 20150401 |
|
| EXPY | Termination of patent right or utility model |