CN106941751A - A kind of drive circuit of variable voltage - Google Patents
A kind of drive circuit of variable voltage Download PDFInfo
- Publication number
- CN106941751A CN106941751A CN201710306267.7A CN201710306267A CN106941751A CN 106941751 A CN106941751 A CN 106941751A CN 201710306267 A CN201710306267 A CN 201710306267A CN 106941751 A CN106941751 A CN 106941751A
- Authority
- CN
- China
- Prior art keywords
- circuit
- drive circuit
- voltage
- chip microcomputer
- variable voltage
- 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.)
- Pending
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Classifications
-
- 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
-
- 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]
-
- 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]
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention discloses a kind of drive circuit of variable voltage, the drive circuit includes single-chip microcomputer, booster circuit, detection circuit, protection circuit and lamp string.On the premise of no more than drive circuit rated power, the drive circuit can be suitably used for driving various power, the LED string of various connected modes, and it can be loaded and changed according to LED string, the operating voltage needed for drive circuit lamp string is provided by the control of single-chip microcomputer, transforming circuit and detection circuit.
Description
Technical field
The present invention relates to field of light fittings, more particularly to a kind of drive circuit of variable voltage.
Background technology
With the progress and the development of science and technology in epoch, the application of current LED string has spread to house decoration, red-letter day gas
Atmosphere, city lighting and public place of entertainment.Compared with traditional ornament lamp, the energy consumption of LED string is relatively low, lucuriant in design, can be achieved
Color change, and length can be cut randomly according to actual decoration demand, meet the floor light and dress of people
Decorations demand.In general, the type of drive of LED string in the market is divided into constant pressure driving and constant current drives two classes；Constant pressure
During driving, output voltage keep it is constant, when LED string load change when, loop current changes therewith, constant voltage drive circuit it is defeated
Going out voltage must be completely the same with the rated voltage demand of LED string.When constant current drives, output current keeps constant, works as LED
During string load change, loop voltage changes therewith, and the output current of constant-current drive circuit must be needed with the rated current of LED string
Ask completely the same.In actual use, because the circuit connecting mode of LED string is varied, it is desirable to rated voltage and volume
Determine that electric current is also different, cause matching driving to be accomplished by plurality of specifications, can not matching error.If reaching LED
The purpose that lamp string can be cut randomly in actual use, load circuit simultaneously (can only be driven) or full string using constant pressure entirely
(using constant current driving) way, and driving voltage or electric current are completely the same with the rated voltage or electric current of LED monomers.Entirely simultaneously
Connection or the way connected entirely, limit the decorative effect of LED string.When the LED string made using series-parallel connection mode, although can
The uniformity of LED luminance is effectively ensured, various decorative effects are reached, but if wherein some LED is broken, other LED electricity
Pressure or electric current can then change therewith, it is possible to influence the luminance state of whole LED decorative lamp string.When in installation and debugging LED string
When, once voltage-stablizer and flow straightener are mixed up, then can whole LED skewered is bad, therefore, one can monitor automatically it is various
The optimum operating voltage of the LED string of mode is connect, and can be automatically adjusted and fixed driving voltage, on this basis, further according to work
Load be automatically adjusted to operating current omnipotent and be driven into urgent need to solve the problem.
The content of the invention
In view of this, to achieve these goals, technical scheme is as follows：
A kind of drive circuit of variable voltage, the drive circuit includes：Single-chip microcomputer, booster circuit, detection circuit and lamp
String, it is characterised in that by single-chip microcomputer output signal, detection circuit feedback signal, single-chip microcomputer is calculated and Regulate signal makes transformation
The required voltage of energy normal work of circuit output LED string.
As a kind of preferred embodiment of the present invention, the single-chip microcomputer output signal is the pwm signal of low accounting, transformation
Voltage can be automatically adjusted to light the voltage needed for the LED string by circuit.
As a kind of preferred embodiment of the present invention, the detection circuit feedback signal is the detection electric circuit inspection institute
The signal of the required voltage is simultaneously fed back to single-chip microcomputer by voltage needed for stating lamp string.
As a kind of preferred embodiment of the present invention, the single-chip microcomputer is calculated and Regulate signal passes through for the single-chip microcomputer
The operating voltage for calculating and making regulating circuit export lamp string according to D=(V0-Vi)/V0 dutycycles for adjusting PWM.
As a kind of preferred embodiment of the present invention, also also include protection circuit, the guarantor including the drive circuit
Protection circuit is made up of voltage-regulator diode D1 and two resistance RES.
As a kind of preferred embodiment of the present invention, regulating circuit is by inductance L1, resistance R2, resistance R6, electric capacity C2, two
Pole pipe D2 and metal-oxide half field effect transistor Q1 is constituted.
As a kind of preferred embodiment of the present invention, the electric routing capacitance C1 of the detection, resistance R1 and resistance R3 are constituted.
As a kind of preferred embodiment of the present invention, the lamp string is multigroup LED string, preferably 2-50 groups, every group of 2-
30, more preferably 2-10 groups, every group 2-15.
As a kind of preferred embodiment of the present invention, the drive circuit connects USB interface.
Compared with prior art, drive circuit of the invention can export according to circuit load situation to export variable
Voltage, i.e., export the pwm signal of a low accounting so that lamp string has electric current, the change of low accounting before cut-in voltage by single-chip microcomputer
Voltage-controlled system can be just adjusted voltage to the voltage lighted needed for described lamp string, detected electric circuit inspection cut-in voltage, fed back to institute
The single-chip microcomputer stated, described single-chip microcomputer is calculated and the dutycycle of the PWM is adjusted according to D=(V0-Vi)/V0 so that risen
Volt circuit provides the normal working voltage of described lamp string, and by setting protection circuit in the driving circuit, exception is occurring
When can disconnect transforming circuit output with ensure LED string use safely.
Brief description of the drawings
Technical scheme in order to illustrate more clearly the embodiments of the present invention, below will be to that will use needed for embodiment description
Accompanying drawing be briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for this
For the those of ordinary skill of field, on the premise of not paying creative work, it can also obtain other according to these accompanying drawings
Accompanying drawing.
Fig. 1 is USB interface power supply circuit schematic diagram of the present invention；
Fig. 2 is variable voltage drive circuit schematic diagram of the present invention.
Drawing reference numeral：
1- protection circuits；2- detects circuit；3-LED；4- drive circuits；5- single-chip microcomputers；6-USB interfaces；7- booster circuits.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
As shown in Figure 1-2, the invention provides a kind of drive circuit of variable voltage, the drive circuit (4) includes single
Piece machine (5), booster circuit (7), detection circuit (2) and lamp string (3), it is anti-by single-chip microcomputer (5) output signal, detection circuit (2)
Feedback signal, single-chip microcomputer (5) are calculated and Regulate signal makes the operating voltage of booster circuit (7) output lamp string (3).The single-chip microcomputer
(5) output signal is the pwm signal of low accounting, and booster circuit (7) can rise to voltage the electricity lighted needed for the lamp string (3)
Pressure.Detection circuit (2) feedback signal voltage and this is required needed for detection circuit (2) detection lamp string (3)
The signal of voltage feeds back to single-chip microcomputer (5).The single-chip microcomputer (5) calculates and Regulate signal is that the single-chip microcomputer (5) passes through calculating
And the operating voltage of booster circuit (7) output lamp string (3) is made according to D=(V0-Vi)/V0 dutycycles for adjusting PWM.The driving
Circuit (4) also includes protection circuit (1), and protection circuit (1) is made up of voltage-regulator diode D1 and two resistance RES, the pole of voltage stabilizing two
Pipe D1 negative electrode connecting resistance R1, the other end is grounded by two resistance RES series connection.The booster circuit (7) is by inductance L1, resistance
R2, resistance R6, electric capacity C2, diode D2 and metal-oxide half field effect transistor Q1 are constituted, the termination powers of inductance L1 mono-, another termination gold
Oxygen half field effect transistor Q1 D poles and diode D2 anode；Resistance R6 one end connects the output end of single-chip microcomputer, another termination gold
Oxygen half field effect transistor Q1 G poles and resistance R2；The terminating resistor R6 of resistance R2 mono- and metal-oxide half field effect transistor Q1 G poles, separately
One end is grounded；Metal-oxide half field effect transistor Q1 S poles ground connection；Diode D2 negative electrode meets electric capacity C2, electric capacity C2 another termination
Ground.The detection circuit (2) is made up of electric capacity C1, resistance R1 and resistance R3, the negative electrode and electricity of a resistance R1 terminating diode
Hold C2, the other end passes through resistance R3 and electric capacity C1 earths.The lamp string (3) is multigroup LED string, and drive circuit (4) is even
Connect USB interface.
Above-described embodiment is the description of the invention, is not limitation of the invention, any simple transformation to the present invention
Structure afterwards belongs to protection scope of the present invention.It should be pointed out that for the person of ordinary skill of the art, can also do
Go out many variations and modifications；All modifications or improvement are regarded as protection scope of the present invention.
Claims (10)
1. a kind of drive circuit of variable voltage, the drive circuit (4) includes single-chip microcomputer (5), transforming circuit (7), detection electricity
Road (2) and lamp string (3), it is characterised in that pass through single-chip microcomputer (5) output signal, detection circuit (2) feedback signal, single-chip microcomputer (5)
Calculate and Regulate signal makes the operating voltage of transforming circuit (7) output lamp string (3).
2. a kind of drive circuit of variable voltage as claimed in claim 1, it is characterised in that single-chip microcomputer (5) the output letter
Number it is the pwm signal of low accounting, transforming circuit (7) can be by voltage-regulation to the voltage put needed for lamp string (3) normal work.
3. a kind of drive circuit of variable voltage as described in one of claim 1-2, it is characterised in that the detection circuit
(2) feedback signal voltage and feeds back to the signal of the required voltage for needed for the detection circuit (2) detects the lamp string (3)
Single-chip microcomputer (5).
4. a kind of drive circuit of variable voltage as claimed in claim 3, it is characterised in that the single-chip microcomputer (5) calculates simultaneously
Regulate signal is the single-chip microcomputer (5) by calculating and making transforming circuit according to D=(V0-Vi)/V0 dutycycles for adjusting PWM
(7) operating voltage of output lamp string (3).
5. a kind of drive circuit of variable voltage as claimed in claim 1, it is characterised in that the drive circuit (4) is also wrapped
Include protection circuit (1).
6. a kind of drive circuit of variable voltage as claimed in claim 5, it is characterised in that the protection circuit (1) is by steady
Diode D1 and two resistance RES are pressed to constitute.
7. a kind of drive circuit of variable voltage as claimed in claim 1, it is characterised in that the transforming circuit (7) is by electricity
Feel L1, resistance R2, resistance R6, electric capacity C2, diode D2 and metal-oxide half field effect transistor Q1 to constitute.
8. a kind of drive circuit of variable voltage as claimed in claim 1, it is characterised in that the detection circuit (2) is by electricity
Hold C1, resistance R1 and resistance R3 to constitute.
9. a kind of drive circuit of variable voltage as claimed in claim 1, it is characterised in that the lamp string (3) is multigroup LED
Lamp string.
10. a kind of drive circuit of variable voltage as claimed in claim 1, it is characterised in that drive circuit (4) connection
USB interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710306267.7A CN106941751A (en) | 2017-04-27 | 2017-04-27 | A kind of drive circuit of variable voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710306267.7A CN106941751A (en) | 2017-04-27 | 2017-04-27 | A kind of drive circuit of variable voltage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106941751A true CN106941751A (en) | 2017-07-11 |
Family
ID=59464102
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710306267.7A Pending CN106941751A (en) | 2017-04-27 | 2017-04-27 | A kind of drive circuit of variable voltage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106941751A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109462912A (en) * | 2018-10-23 | 2019-03-12 | 程思明 | A kind of LED light string of USB power supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109462912A (en) * | 2018-10-23 | 2019-03-12 | 程思明 | A kind of LED light string of USB power supply |
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|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170711 |
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| RJ01 | Rejection of invention patent application after publication |