CN109392214A - A kind of linearity constant current control circuit adapting to full voltage input - Google Patents
A kind of linearity constant current control circuit adapting to full voltage input Download PDFInfo
- Publication number
- CN109392214A CN109392214A CN201710676744.9A CN201710676744A CN109392214A CN 109392214 A CN109392214 A CN 109392214A CN 201710676744 A CN201710676744 A CN 201710676744A CN 109392214 A CN109392214 A CN 109392214A
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- voltage
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
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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
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The present invention relates to a kind of linearity constant current control circuits of adaptation full voltage input, including full-wave rectifying circuit, LED string, switching switch, amplitude attenuation and peak detection circuit, A/D conversion circuit, microprocessor, reference voltage generator, segmented constant-current control circuit, the LED string includes high section voltage segment and low section of voltage segment, the microprocessor controls switching switch so that the high section voltage segment of LED string and low section of voltage segment progress are in series or in parallel according to the height of input voltage, each LED segmentation of the LED string has centre tap to be linked into the independent current constant control of segmented constant-current control circuit progress, circuit structure of the present invention is simple, high reliablity.
Description
Technical field
The invention belongs to power electronics fields more particularly to a kind of linear constant current for adapting to full voltage input to control electricity
Road.
Background technique
There is the electric energy for reaching same illumination needs less as the lamps and lanterns of solid-state lighting light source using LED, compares conventional lamp
The distinguishing feature of longer service life, thus achieve the purpose that energy conservation, maintenance cost are low, it is gradually extensive in industrial lighting field
Ground application.
Industrial lighting lamp, mainly in petroleum, chemical industry, steel, metallurgy, mine, fire-fighting and combustion gas, railway, electric power, public affairs
Peace, army, flood control, the diving industries such as salvage and rescue and relief work have been used as operating illumination and emergency lighting generally to use.Using existing
The scope range of the fluctuation of voltage of field is very big, in some countries, such as the U.S., has two kinds of input voltages of 120V and 277V, needs lamps and lanterns straight
Access, and maintain like power and illumination.And the constant current of directly driven by AC piece-wise linear is used to connect using fixed LED
Mode is connect, can be separately designed under some univoltage and reliably working, cannot be accomplished in 120V 220V 277V input voltage
Under compatibility.And the piece-wise linear constant-current drive circuit of univoltage, the connection type of LED are fixed, every Duan Junyou taps
It is connected to switch constant-current control circuit, such connection type can only meet the application of univoltage.If system is designed as 120
Voltage is lied prostrate, and when input voltage is connected to 277 volts, it is excessively high or cause to overheat because efficiency is too low to will lead to system power.If system
277 volts of voltages are designed as, when input voltage is connected to 120v, have part LED since undertension cannot be lighted normally.
Summary of the invention
In order to solve the above technical problems, the object of the present invention is to provide a kind of linear constant currents of adaptation full voltage input
Control circuit, the circuit structure is simple, high reliablity.
In order to achieve the above-mentioned object of the invention, present invention employs technical solutions below:
A kind of linearity constant current control circuit adapting to full voltage input, including full-wave rectifying circuit, LED go here and there, switching switchs,
Amplitude attenuation and peak detection circuit, A/D conversion circuit, microprocessor, reference voltage generator, segmented current constant control electricity
Road, the LED string includes high section voltage segment and low section of voltage segment, and the microprocessor is controlled according to the height of input voltage
Switching switch is so that the high section voltage segment of LED string and low section of voltage segment carry out in series or in parallel, each of described LED string
LED segmentation has centre tap to be linked into the independent current constant control of segmented constant-current control circuit progress, the electricity after peak detection
Then pressure is input to microprocessor by A/D conversion circuit again, the program of microprocessor calculated according to different crest voltages or
Person is to extract the reference voltage value prestored in table, is output to reference voltage generator module, is generated negatively correlated with input voltage
Reference voltage, reference voltage strings effect to LED by segmented constant-current control circuit to keeping power invariability.
As a preferred solution: the switching switch includes resistance R1, resistance R2, zener diode VD1, diode D1, height
Triode Q1 and high pressure NMOS pipe Q2 is pressed, the collector of the high-voltage three-pole pipe Q1 is connected with the end G of high pressure NMOS pipe Q2, described
The end S of high pressure NMOS pipe Q2 is connected with diode D1, is also connected with pressure stabilizing two between the end S and the end G of the high pressure NMOS pipe Q2
Pole pipe VD1, when the base voltage of Q1 is high level, Q1 is connected, and the collector voltage of Q1 is pulled low, and the end the G voltage of Q2 is lower than the end S
Voltage, Q2 cut-off；When the base voltage of Q1 is low level, Q1 ends, and the collector voltage R1 of Q1 is drawn high, the end the G voltage of Q2
Higher than the voltage at the end S, Q2 conducting.
As a preferred solution: the amplitude attenuation and peak detection circuit include the resistance R3 and resistance R4 being serially connected,
The diode D2 and capacitor C1 being serially connected, diode D2 and capacitor C1 are connected in parallel on resistance R4, are parallel on the capacitor C1
For the resistance R5 for C1 voltage of releasing；AC-input voltage is decayed after full-wave rectification by R3 and R4 resistor network,
Peak value detection is carried out by diode D2 and C1.
The present invention provides a kind of adaptation full voltage, high reliability, the simple light source module groups of structure, on the one hand make industrial photograph
Bright lamp tool standardizes on light source, reduces overlapping development, reduces production cost with large-scale production, on the other hand can be improved
Interchangeability reduces maintenance cost.
Detailed description of the invention
Fig. 1 is the schematic block circuit diagram of the prior art.
Fig. 2 is schematic block circuit diagram of the invention.
Fig. 3 is particular circuit configurations figure of the invention.
Fig. 4 is the circuit diagram of switching switch of the invention.
Fig. 5 is amplitude attenuation and peak detection circuit figure of the invention.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
A kind of linearity constant current control circuit of adaptation full voltage input as Figure 1-Figure 5, including full-wave rectifying circuit,
LED string, switching switch, amplitude attenuation and peak detection circuit, microprocessor, reference voltage generator, divide A/D conversion circuit
Segmentation constant-current control circuit, the LED string includes high section voltage segment and low section of voltage segment, and the microprocessor is according to input
The height control switching switch of voltage so that the high section voltage segment and low section of voltage segment of LED string carry out it is in series or in parallel,
Each LED segmentation of the LED string has centre tap to be linked into the independent current constant control of segmented constant-current control circuit progress,
Then voltage after peak detection is input to microprocessor by A/D conversion circuit again, the program of microprocessor is according to different
Crest voltage, which calculates, either extracts the reference voltage value that prestores in table, is output to reference voltage generator module, generate with
The reference voltage of input voltage negative correlation, reference voltage string effect to LED by segmented constant-current control circuit to keep
Power invariability.
As a preferred solution: the switching switch includes resistance R1, resistance R2, zener diode VD1, diode D1, height
Triode Q1 and high pressure NMOS pipe Q2 is pressed, the collector of the high-voltage three-pole pipe Q1 is connected with the end G of high pressure NMOS pipe Q2, described
The end S of high pressure NMOS pipe Q2 is connected with diode D1, is also connected with pressure stabilizing two between the end S and the end G of the high pressure NMOS pipe Q2
Pole pipe VD1, when the base voltage of Q1 is high level, Q1 is connected, and the collector voltage of Q1 is pulled low, and the end the G voltage of Q2 is lower than the end S
Voltage, Q2 cut-off；When the base voltage of Q1 is low level, Q1 ends, and the collector voltage R1 of Q1 is drawn high, the end the G voltage of Q2
Higher than the voltage at the end S, Q2 conducting.
As a preferred solution: the amplitude attenuation and peak detection circuit include the resistance R3 and resistance R4 being serially connected,
The diode D2 and capacitor C1 being serially connected, diode D2 and capacitor C1 are connected in parallel on resistance R4, are parallel on the capacitor C1
For the resistance R5 for C1 voltage of releasing；AC-input voltage is decayed after full-wave rectification by R3 and R4 resistor network,
Peak value detection is carried out by diode D2 and C1.
The present invention designs novel system architecture, and led string is divided into high section voltage and low section of voltage segment, can dynamically root
Switched in series and parallel according to input voltage, when input voltage is low section of voltage, led is series-parallel, as shown in Figure 2.To improve
The utilization rate of LED, each LED segmentation have that centre tap is linked into switching and constant-current control circuit carries out independent constant current control
System and system switching, to can reliably work in low section of voltage and high section voltage.
As shown in figure 3, when micro- reason device detects that input voltage peak value is less than setting value, switching to A point, D1, D2,
The LED string of D3 and the LED of D4, D5, D6 string are parallel-connection structure, D1, D2, D3, D4, D5, D6 here indicate multiple LED series connection or
Combination in parallel.When micro- reason device detects that input voltage peak value is greater than the set value, switching to B point, the LED of D1, D2, D3
The LED string of string and D4, D5, D6 is cascaded structure.
Fig. 4 show the circuit structure of switching switch.Q1 is high-voltage three-pole pipe, and Q2 is high-voltage MOS pipe, selects pressure resistance here
The NMOS tube that value is 600V is as switching switch.When the base voltage of Q1 is high level, Q1 is connected, and the collector voltage of Q1 is drawn
Low, the end the G voltage of Q2 is lower than the voltage at the end S, Q2 cut-off.When the base voltage of Q1 is low level, Q1 cut-off, the collector electricity of Q1
Pressure R1 is drawn high, and the end the G voltage of Q2 is higher than the voltage at the end S, Q2 conducting.
Fig. 5 is amplitude attenuation and peak detection circuit, and AC-input voltage is after full-wave rectification, by R3 and R4 resistance
Network is decayed, and carries out peak value detection by diode d2 and C1, the purpose of R5 is to guarantee peak for the voltage for the C1 that releases in time
Value detecting circuit follows speed.
Voltage input after peak detection is to the Analog-digital Converter module of microprocessor, and the program of microprocessor is not according to
Same crest voltage calculates the reference voltage value for either extracting and prestoring in table, is output to reference voltage generator module, produces
The raw reference voltage with input voltage negative correlation, to keep power invariability.
It should be pointed out that above embodiments are only representative examples of the invention.The present invention can also there are many deformations.It is all
Any simple modification, equivalent change and modification to the above embodiments of essence according to the present invention are considered as belonging to this
The protection scope of invention.
Claims (3)
1. a kind of linearity constant current control circuit for adapting to full voltage input, it is characterised in that: gone here and there including full-wave rectifying circuit, LED,
Switching switch, amplitude attenuation and peak detection circuit, A/D conversion circuit, microprocessor, reference voltage generator, segmented are permanent
Flow control circuit, the LED string includes high section voltage segment and low section of voltage segment, and the microprocessor is according to input voltage
Height control switching switch is so that the high section voltage segment of LED string and low section of voltage segment carry out in series or in parallel, the LED
Each LED segmentation of string has centre tap to be linked into the independent current constant control of segmented constant-current control circuit progress, peak value inspection
Then voltage after survey is input to microprocessor by A/D conversion circuit again, the program of microprocessor is according to different peak value electricity
Pressure calculates the reference voltage value for either extracting and prestoring in table, is output to reference voltage generator module, generates and input electricity
Negatively correlated reference voltage is pressed, reference voltage strings effect to LED to keep power permanent by segmented constant-current control circuit
It is fixed.
2. a kind of linearity constant current control circuit for adapting to full voltage input according to claim 1, it is characterised in that: described
Switching switch includes resistance R1, resistance R2, zener diode VD1, diode D1, high-voltage three-pole pipe Q1 and high pressure NMOS pipe Q2,
The collector of the high-voltage three-pole pipe Q1 is connected with the end G of high pressure NMOS pipe Q2, and the end S of the high pressure NMOS pipe Q2 is connected with two
Pole pipe D1, is also connected with zener diode VD1 between the end S and the end G of the high pressure NMOS pipe Q2, when the base voltage of Q1 is height
Level, Q1 conducting, the collector voltage of Q1 are pulled low, and the end the G voltage of Q2 is lower than the voltage at the end S, Q2 cut-off；When the base stage electricity of Q1
Pressure is low level, and Q1 ends, and the collector voltage R1 of Q1 is drawn high, and the end the G voltage of Q2 is higher than the voltage at the end S, Q2 conducting.
3. a kind of linearity constant current control circuit for adapting to full voltage input according to claim 1, it is characterised in that: described
Amplitude attenuation and peak detection circuit include the resistance R3 and resistance R4 being serially connected, the diode D2 and capacitor being serially connected
C1, diode D2 and capacitor C1 are connected in parallel on resistance R4, and the resistance R5 for C1 voltage of releasing is parallel on the capacitor C1；It hands over
Input voltage is flowed after full-wave rectification, is decayed by R3 and R4 resistor network, carries out peak value by diode D2 and C1
Detection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710676744.9A CN109392214A (en) | 2017-08-09 | 2017-08-09 | A kind of linearity constant current control circuit adapting to full voltage input |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710676744.9A CN109392214A (en) | 2017-08-09 | 2017-08-09 | A kind of linearity constant current control circuit adapting to full voltage input |
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| Publication Number | Publication Date |
|---|---|
| CN109392214A true CN109392214A (en) | 2019-02-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710676744.9A Pending CN109392214A (en) | 2017-08-09 | 2017-08-09 | A kind of linearity constant current control circuit adapting to full voltage input |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113630933A (en) * | 2021-09-18 | 2021-11-09 | 上海三思电子工程有限公司 | LED driver, driving circuit and driving method |
| CN114301271A (en) * | 2021-07-05 | 2022-04-08 | 华为数字能源技术有限公司 | Power conversion system and control method |
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| CN102421226A (en) * | 2011-09-06 | 2012-04-18 | 上海新进半导体制造有限公司 | LED (light-emitting diode) dimming driving circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114301271A (en) * | 2021-07-05 | 2022-04-08 | 华为数字能源技术有限公司 | Power conversion system and control method |
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| CN113630933A (en) * | 2021-09-18 | 2021-11-09 | 上海三思电子工程有限公司 | LED driver, driving circuit and driving method |
| CN113630933B (en) * | 2021-09-18 | 2024-02-27 | 上海三思电子工程有限公司 | LED driver, driving circuit and driving method |
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Application publication date: 20190226 |
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