CN105101539B - Constant current driver circuit for LED - Google Patents
Constant current driver circuit for LED Download PDFInfo
- Publication number
- CN105101539B CN105101539B CN201510408945.1A CN201510408945A CN105101539B CN 105101539 B CN105101539 B CN 105101539B CN 201510408945 A CN201510408945 A CN 201510408945A CN 105101539 B CN105101539 B CN 105101539B
- Authority
- CN
- China
- Prior art keywords
- current
- power switch
- constant
- switch pipe
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention discloses a kind of constant current driver circuit for LED, including alternating current input power supplying, rectification circuit and constant-current control circuit, the rectification circuit receives alternating current input power supplying, rectification circuit obtains DC voltage, the constant-current control circuit and load in series to alternating current input power supplying rectification, the constant-current control circuit includes power switch pipe, by controlling the conducting state of power switch pipe, to adjust output current so that the average current for flowing through load is kept constant；Derided capacitors are in series between the alternating current input power supplying and rectification circuit.The present invention is connected derided capacitors by input terminal, the moment is opened in power switch pipe, the pressure drop at derided capacitors both ends is located at for maximum value, play the role of partial pressure, the pressure drop of moment thereon is opened so as to reduce power switch pipe, the turn-on consumption of power switch pipe is thus reduced, improves the working efficiency of circuit.
Description
Technical field
The present invention relates to power electronics fields, and in particular to a kind of constant current driver circuit for LED.
Background technology
For field of LED illumination, common electric main is obtained as input power, alternating current input power supplying by rectification circuit
DC voltage, the DC voltage are converted through voltage, are generated constant current and are powered to LED load.
The constant current driver circuit for LED of the prior art, including alternating current input power supplying, rectification circuit and constant-current control circuit, institute
The rectification circuit stated receives alternating current input power supplying, and rectification circuit obtains DC voltage, the perseverance to alternating current input power supplying rectification
Flow control circuit and load in series, the constant-current control circuit includes power switch pipe, by controlling leading for power switch pipe
Logical state, to adjust output current so that the average current for flowing through load is kept constant.
Above in the prior art, the power switch pipe opens difference of the pressure drop for input voltage and output voltage, because
This its open that power consumption is larger, the efficiency of circuit is very low, although and can reduce power switch pipe by the partial pressure mode of the prior art
The working efficiency opened pressure drop, but bleeder circuit still has larger energy consumption, can not fundamentally improve circuit.
Invention content
In view of this, the purpose of the present invention is to provide a kind of constant current driver circuit for LED, exist to solve the prior art
Open pressure drop excessively high the technical issues of causing circuit efficiency low.
The technical solution of the present invention is to provide a kind of constant current driver circuit for LED with lower structure, is inputted including exchange
Power supply, rectification circuit and constant-current control circuit, the rectification circuit receive alternating current input power supplying, and rectification circuit inputs exchange
Power rectifier, obtains DC voltage, the constant-current control circuit and load in series, and the constant-current control circuit includes power
Switching tube, by controlling the conducting state of power switch pipe, to adjust output current so that the average current for flowing through load is kept
It is constant；
Derided capacitors are in series between the alternating current input power supplying and rectification circuit；In positive half period, power switch
Pipe is opened the moment, and the pressure drop at the derided capacitors both ends is positive peak；In negative half-cycle, when power switch pipe is opened
It carves, the pressure drop at the derided capacitors both ends is negative peak.
Preferably, in positive half period, during power switch pipe is opened, the voltage linear at the derided capacitors both ends
Decline；In negative half-cycle, during power switch pipe is opened, the voltage linear at the derided capacitors both ends rises.
Preferably, the average value of the DC voltage and the average current for flowing through load are kept constant, the partial pressure
The minimum value of capacitor's capacity is equal to the ratio of the average current and the voltage change ratio in a switch periods.
Preferably, the capacitance of the derided capacitors reduces, and the pressure difference increase at derided capacitors both ends, power switch pipe is opened
Logical pressure drop reduces.
Preferably, constant-current control circuit sampling flows through the electric current of power switch pipe, obtains characterizing the current value
Sampled voltage signal, and be compared with reference current signal, export the break-make and conducting shape for controlling power switch pipe
The control signal of state.
Preferably, the constant-current control circuit includes operational amplifier, the sampled voltage signal and reference current letter
Two input terminals of number difference input operational amplifier, the output terminal of the operational amplifier is through resistance and power switch pipe
Control terminal connects；During power switch pipe is connected, linear zone is worked in.
Circuit structure using the present invention compared with prior art, has the following advantages：The present invention is connected by input terminal
Derided capacitors are opened the moment in power switch pipe, and it is maximum value that the pressure drop at derided capacitors both ends, which is located at, plays the work of partial pressure
With, the pressure drop of moment thereon is opened so as to reduce power switch pipe, thus the turn-on consumption of power switch pipe is reduced, it divides
Capacitance hardly consumes electric energy, therefore improve the working efficiency of circuit while realizing partial pressure.
Description of the drawings
Fig. 1 is the circuit structure diagram of constant current driver circuit for LED of the present invention；
Fig. 2 is the working waveform figure of the present invention；
Specific embodiment
The preferred embodiment of the present invention is described in detail, but the present invention is not restricted to these below in conjunction with attached drawing
Embodiment.The present invention covers any replacement made in the spirit and scope of the present invention, modification, equivalent method and scheme.
In order to which the public is made to have thorough understanding to the present invention, it is described in detail in present invention below preferred embodiment specific
Details, and description without these details can also understand the present invention completely for a person skilled in the art.
The present invention is more specifically described by way of example with reference to attached drawing in the following passage.It should be noted that attached drawing is adopted
With more simplified form and using non-accurate ratio, only to convenience, the embodiment of the present invention is lucidly aided in illustrating
Purpose.
Refering to what is shown in Fig. 1, illustrating the particular circuit configurations of the constant current driver circuit for LED of the present invention, inputted including exchange
Power supply Vin, rectification circuit and constant-current control circuit, the rectification circuit receive alternating current input power supplying Vin, and rectification circuit is to handing over
Input power Vin rectifications are flowed, obtain DC voltage Vout, the constant-current control circuit and load in series, in the load
Shunt capacitance C2.The constant-current control circuit includes power switch pipe M, and sampling flows through the electric current of power switch pipe M, and and base
Quasi- current signal is compared, by controlling the conducting state of power switch pipe M, to adjust output current so that flow through load
Average current keep constant；
Load and the voltage of power switch pipe M common ends are Vbus, the alternating current input power supplying Vin and rectification circuit it
Between be in series with derided capacitors C1；In positive half period, power switch pipe M is opened the moment, the pressure at the derided capacitors C1 both ends
It is reduced to positive peak；In negative half-cycle, power switch pipe M is opened the moment, and the pressure drop at the derided capacitors C1 both ends is most
Big negative value.
It is opened the moment in power switch pipe M, Vbus is that power switch pipe M opens pressure drop.The electricity at derided capacitors both ends
It presses as Vcap, opens pressure drop Vbus=Vin-Vcap-Vout.Therefore, compared with prior art, due to the partial pressure of derided capacitors C1
Effect, the pressure drop of opening of power switch pipe M is substantially reduced, and the derided capacitors C1 as energy-storage travelling wave tube hardly consumes energy, therefore logical
It crosses reduction and opens pressure drop, reduce the turn-on consumption of power switch pipe, improve circuit working efficiency.
The constant-current control circuit sampling flows through the electric current (being realized by sampling resistor R4) of power switch pipe M, obtains table
The sampled voltage signal Vsen of the current value is levied, and is compared with reference current signal Vref, exports that power is controlled to open
Close the break-make of pipe and the control signal Vctrl of conducting state.Constant-current control circuit includes operational amplifier A, the sampling electricity
Press two input terminals of signal Vsen and reference current signal Vref difference input operational amplifiers A, the operational amplifier A
Output terminal connect through resistance R1 with the control terminal of power switch pipe M；During power switch pipe M is connected, work in linear
Area.The sampled voltage signal Vsen is connected to the inverting input of operational amplifier A, the reference current through resistance R2
Signal Vref is connected to the normal phase input end of operational amplifier through resistance R3.Inverting input and output in operational amplifier A
Capacitance C3 is connected between end.
Refering to what is shown in Fig. 2, illustrating the working waveform figure of constant current driver circuit for LED of the present invention, exchange input electricity is provided
Source Vin, derided capacitors both ends voltage Vcap, open the waveform correspondence of pressure drop Vbus and input current Iin.
In positive half period, during power switch pipe M is opened, the voltage Vcap at the derided capacitors C1 both ends is linear
Decline；In negative half-cycle, during power switch pipe M opens, on the voltage Vcap at the derided capacitors C1 both ends is linear
It rises.The positive and negative half period is for the power frequency period of alternating current input power supplying.
The average value of the DC voltage Vout and the average current Iout for flowing through load are kept constant, the partial pressure
The minimum value of capacitor's capacity is equal to voltage change ratio (the i.e. derided capacitors two in the average current Iout and a switch periods
Change rates of the voltage Vcap at end in a switch periods) ratio.It can be expressed with equation below：Cmin=Iout/ (dU/
dT)。
The capacitance of the derided capacitors C1 reduces, and the pressure difference increase at derided capacitors both ends, power switch pipe opens pressure
Drop reduces, and turn-on consumption reduces, efficiency increase.Conversely, the capacitance increase of the derided capacitors C1, derided capacitors C1 both ends
Pressure difference reduces, and power switch pipe M's opens pressure drop and can be increased, turn-on consumption increase but loss is still significantly less than existing skill
Art, at this time current phase can be delayed, power factor increase.Therefore, in actual use, can efficiency and power because
Tradeoff is made between number, to select the derided capacitors C1 of suitable capacitance.
Embodiments described above does not form the restriction to the technical solution protection domain.It is any in above-mentioned implementation
Modifications, equivalent substitutions and improvements made within the spirit and principle of mode etc., should be included in the protection model of the technical solution
Within enclosing.
Claims (6)
1. a kind of constant current driver circuit for LED, including alternating current input power supplying, rectification circuit and constant-current control circuit, the rectification
Circuit is connected to alternating current input power supplying, and rectification circuit obtains DC voltage, the current constant control to alternating current input power supplying rectification
Circuit and load in series, the constant-current control circuit includes power switch pipe, by controlling the conducting state of power switch pipe,
To adjust output current so that the average current for flowing through load is kept constant；
It is characterized in that：Derided capacitors are in series between the alternating current input power supplying and rectification circuit；The power switch plumber
Make in linear zone, voltage and the derided capacitors both ends of the pressure drop on the power switch pipe for the alternating current input power supplying
The difference of the output voltage sum of the two of voltage and the rectification circuit, the capacitance of the derided capacitors is according to the power switch
The loss of pipe is determined with the power factor of the driving circuit of the constant current driver circuit for LED.
2. constant current driver circuit for LED according to claim 1, it is characterised in that：In positive half period, power switch pipe is opened
During logical, the voltage linear at the derided capacitors both ends declines；In negative half-cycle, during power switch pipe is opened, institute
The voltage linear at the derided capacitors both ends stated rises.
3. constant current driver circuit for LED according to claim 1 or 2, it is characterised in that：The average value of the DC voltage and
The average current for flowing through load is kept constant, and the minimum value of the derided capacitors capacitance is equal to the average current and one
The ratio of voltage change ratio in switch periods.
4. constant current driver circuit for LED according to claim 1, it is characterised in that：The capacitance of the derided capacitors reduces,
The pressure difference increase at derided capacitors both ends, power switch pipe open pressure drop reduction.
5. constant current driver circuit for LED according to claim 1 or 2, it is characterised in that：The constant-current control circuit sampling
The electric current of power switch pipe is flowed through, obtains characterizing the sampled voltage signal of the current value, and be compared with reference current signal,
It exports to control the break-make of power switch pipe and the control signal of conducting state.
6. constant current driver circuit for LED according to claim 5, it is characterised in that：The constant-current control circuit includes fortune
Two input terminals of amplifier, the sampled voltage signal and reference current signal difference input operational amplifier are calculated, it is described
The output terminal of operational amplifier is connected through the control terminal of resistance and power switch pipe；During power switch pipe is connected, work
In linear zone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510408945.1A CN105101539B (en) | 2015-07-13 | 2015-07-13 | Constant current driver circuit for LED |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510408945.1A CN105101539B (en) | 2015-07-13 | 2015-07-13 | Constant current driver circuit for LED |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105101539A CN105101539A (en) | 2015-11-25 |
| CN105101539B true CN105101539B (en) | 2018-06-29 |
Family
ID=54580758
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510408945.1A Active CN105101539B (en) | 2015-07-13 | 2015-07-13 | Constant current driver circuit for LED |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105101539B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106973453B (en) * | 2016-01-14 | 2018-07-03 | 立锜科技股份有限公司 | The driving method of light emitting element driving circuit and light-emitting element circuit |
| CN108880252B (en) * | 2018-07-13 | 2020-04-28 | 昂宝电子（上海）有限公司 | Linear constant current circuit |
| CN109348578B (en) * | 2018-10-25 | 2024-03-22 | 杰华特微电子股份有限公司 | Lighting control method, control circuit and lighting system |
| CN109407744B (en) * | 2018-12-03 | 2020-03-27 | 昂宝电子（上海）有限公司 | Linear constant current control system and method for constant current control of a load |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2117693U (en) * | 1991-12-02 | 1992-09-30 | 山西省雁北地区社会福利开发总公司 | General electronic ballast |
| CN102570296A (en) * | 2011-02-25 | 2012-07-11 | 北京国科世纪激光技术有限公司 | Drive circuit of laser diode |
| CN103037558A (en) * | 2011-09-29 | 2013-04-10 | 海洋王照明科技股份有限公司 | Over-current protection circuit of light-emitting diode (LED) constant-current driving circuit |
| CN103152949A (en) * | 2013-03-11 | 2013-06-12 | 矽力杰半导体技术(杭州)有限公司 | Capacitance buck type light emitting diode (LED) driver and capacitance buck type LED driving method |
| CN103187886A (en) * | 2013-03-27 | 2013-07-03 | 上海华群实业股份有限公司 | No-buffering small-power alternating current (AC)/direct current (DC) power |
| CN204031524U (en) * | 2014-06-18 | 2014-12-17 | 四川新力光源股份有限公司 | A kind of constant current driver circuit for LED |
-
2015
- 2015-07-13 CN CN201510408945.1A patent/CN105101539B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2117693U (en) * | 1991-12-02 | 1992-09-30 | 山西省雁北地区社会福利开发总公司 | General electronic ballast |
| CN102570296A (en) * | 2011-02-25 | 2012-07-11 | 北京国科世纪激光技术有限公司 | Drive circuit of laser diode |
| CN103037558A (en) * | 2011-09-29 | 2013-04-10 | 海洋王照明科技股份有限公司 | Over-current protection circuit of light-emitting diode (LED) constant-current driving circuit |
| CN103152949A (en) * | 2013-03-11 | 2013-06-12 | 矽力杰半导体技术(杭州)有限公司 | Capacitance buck type light emitting diode (LED) driver and capacitance buck type LED driving method |
| CN103187886A (en) * | 2013-03-27 | 2013-07-03 | 上海华群实业股份有限公司 | No-buffering small-power alternating current (AC)/direct current (DC) power |
| CN204031524U (en) * | 2014-06-18 | 2014-12-17 | 四川新力光源股份有限公司 | A kind of constant current driver circuit for LED |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105101539A (en) | 2015-11-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105101539B (en) | Constant current driver circuit for LED | |
| CN102202449A (en) | LED driving control circuit and method | |
| CN105337485B (en) | Circuit of power factor correction, LED driving circuit and lighting apparatus | |
| CN108809090B (en) | A kind of High Power Factor multichannel low ripple constant current output switch converters | |
| CN108770117B (en) | A kind of integrated LED drive power of compatible electronic transformer | |
| CN203313490U (en) | LED current ripple elimination driving circuit | |
| CN103745701B (en) | Inverse-excitation type booster circuit, LED-backlit drive circuit and liquid crystal display | |
| CN201690360U (en) | Shunting type active power factor correcting circuit | |
| CN105792421B (en) | A kind of no bridge type LED drive power | |
| CN107885128A (en) | The high-power resistive load of continuously adjustabe based on alternating expression PWM | |
| CN101909376B (en) | High-power LED drive circuit | |
| CN207216474U (en) | A kind of current sample change-over circuit and LED constant current power supply | |
| CN203636178U (en) | Inverter welder | |
| CN204616156U (en) | A kind of LED drive circuit being applicable to controllable silicon light modulation | |
| CN103706923A (en) | Inverter welder | |
| CN207475932U (en) | A kind of isolated LED drive circuit | |
| CN105939555A (en) | LED drive device and control circuit and control method of LED drive device | |
| CN102612195B (en) | LED (light emitting diode) constant current driving circuit and LED lamp using same | |
| CN204578382U (en) | A kind of single-chip switching stabilized voltage power supply | |
| CN209710366U (en) | Illumination control circuit and lighting system | |
| CN203691696U (en) | Bridgeless LED drive circuit | |
| CN206559675U (en) | A kind of LED dimming driving circuits | |
| CN203340372U (en) | LED lamp driving power supply employing analog dimming | |
| CN209710367U (en) | A kind of illumination control circuit and lighting system | |
| CN203326879U (en) | Quasi-single-stage high-power-factor constant-current circuit and device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP02 | Change in the address of a patent holder |
Address after: 310051 No. 6 Lianhui Street, Xixing Street, Binjiang District, Hangzhou City, Zhejiang Province Patentee after: Silergy Semiconductor Technology (Hangzhou ) Co., Ltd. Address before: 310012 Wensanlu Road, Hangzhou Province, No. 90 East Software Park, science and technology building A1501 Patentee before: Silergy Semiconductor Technology (Hangzhou ) Co., Ltd. |
|
| CP02 | Change in the address of a patent holder |