CN106163006A - Drive circuit for LED device - Google Patents
Drive circuit for LED device Download PDFInfo
- Publication number
- CN106163006A CN106163006A CN201610626028.5A CN201610626028A CN106163006A CN 106163006 A CN106163006 A CN 106163006A CN 201610626028 A CN201610626028 A CN 201610626028A CN 106163006 A CN106163006 A CN 106163006A
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- China
- Prior art keywords
- drive circuit
- voltage difference
- output
- low voltage
- stable
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Classifications
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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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- Continuous-Control Power Sources That Use Transistors (AREA)
Abstract
The present invention discloses a kind of drive circuit for LED device, including a low voltage difference stable-pressure device, an increasing apparatus and a feedback device, described low voltage difference stable-pressure device includes one first input pin, in order to coupled to the input voltage of outside, to produce a low current and the first stable output voltage；Described increasing apparatus coupled to this low voltage difference stable-pressure device, to be boosted according to certain multiplying power by this first output voltage, can drive the driving voltage needed for this LED device obtaining one, and by an output connecting pin output；Described feedback device coupled to the output connecting pin of this increasing apparatus and the second input pin of this low voltage difference stable-pressure device, so that the driving voltage of output to feed back to this low voltage difference stable-pressure device.
Description
Technical field
The present invention relates to a kind of drive circuit, particularly to a kind of drive circuit for LED device.
Background technology
Refer to shown in Fig. 1, existing LED drive system comprises increasing apparatus 110 and low voltage difference stable-pressure device (low
Dropout regulator) 120, this increasing apparatus 110 is connected to input voltage vin, this input voltage vin to be boosted to
Booster voltage Vb, this low voltage difference stable-pressure device 120 is connected to this increasing apparatus 110, so that this booster voltage Vb is adjusted, with
Obtain the output voltage Vo that electric current is less and stable, this output voltage Vo then for driven for emitting lights diode operation.But existing
On some portable equipments, its input voltage vin that can be provided by is typically about 3.6V, and light emitting diode then needs 4.5V's
Voltage could be driven.As this increasing apparatus 110 is used 1.5 multiplying powers to increase this input voltage vin, then this booster voltage Vb
Be then 5.4V, owing to this low voltage difference stable-pressure device 120 has some voltage drops, so time this output voltage Vo be often below
4.5V, and be difficult to drive this light emitting diode.So, this increasing apparatus 110 can only be used 2 times by existing portable equipment
Rate increases this input voltage vin, and obtains the booster voltage Vb being about 7.2V, then is exported by this low voltage difference stable-pressure device 120
The output voltage Vo of 4.5V, to drive this light emitting diode.This kind of mode, though this light emitting diode can be driven, but this low pressure
This booster voltage Vb is converted into 4.5V by 7.2V by difference stable-pressure device 120, and its conversion efficiency is the lowest.
Summary of the invention
Embodiment of the present invention technical problem to be solved there are provided one can be by input voltage conversion to being suitable for LED
The voltage of equipment and the high drive circuit of conversion efficiency.
The invention provides a kind of drive circuit for LED device, including a low voltage difference stable-pressure device, an increasing apparatus
And a feedback device, described low voltage difference stable-pressure device includes one first input pin, in order to coupled to the input voltage of outside, with
Produce a low current and the first stable output voltage；Described increasing apparatus coupled to this low voltage difference stable-pressure device, with by this
One output voltage boosts according to certain multiplying power, can drive the driving voltage needed for this LED device obtaining one, and defeated by one
Go out pin output；Described feedback device coupled to the output connecting pin of this increasing apparatus and the second input of this low voltage difference stable-pressure device
Pin, to feed back to this low voltage difference stable-pressure device by the driving voltage of output.
Wherein, the multiplying power that increases of described increasing apparatus is 1.5 times, 2.0 times, 2.5 times or 3.0 times.
Wherein, described feedback device includes the first resistance and the second resistance being connected in series.
Wherein, the first end of described first resistance is connected to the output connecting pin of this increasing apparatus, and it is low that the second end is connected to this
Second input pin and the first end of this second resistance of pressure reduction stable-pressure device, the second end of this second resistance is connected to a low electricity
Position.
Wherein, this low voltage difference stable-pressure device includes an operational amplifier and a transistor.
Wherein, described transistor is PMOS transistor.
The present invention is by this feedback device, and this driving voltage can stably be exported, simultaneously by using this increasing apparatus
The driving voltage of outfan as feedback voltage, compare existing drive circuit, drive circuit of the present invention more can be anti-
The situation of load should be gone out, and carry out the automatic adjustment of this driving voltage.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
In having technology to describe, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to
Other accompanying drawing is obtained according to these accompanying drawings；
Fig. 1 is the block diagram of the existing drive circuit for LED device.
Fig. 2 is the present invention block diagram for the better embodiment of the drive circuit of LED device.
Fig. 3 is the circuit diagram of increasing apparatus in Fig. 2.
Fig. 4 is the circuit diagram of drive circuit in Fig. 2.
Detailed description of the invention
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
Describe, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments wholely.Based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under not making creative work premise
Embodiment, broadly falls into the scope of protection of the invention.
First, before embodiment is described, it is necessary to some herein presented terms are explained.Example
As:
If occurring herein using the term such as " first ", " second " to describe various element, but these elements should not be by this
A little terms are limited.These terms are only used for distinguishing an element and another element.Therefore, " first " element can also be claimed
For " second " element without departing from the teachings of the present invention.
In addition, it is to be understood that when mentioning that an element " connects " or during " coupled " to another element, it can be direct
Ground connects or is directly coupled to another element or can also there is intermediary element.On the contrary, when mentioning an element " directly
Connect " or " directly couple " to another element time, the most there is not intermediary element.
The various terms occurred in this article are used only for describing the purpose of specific embodiment and being not intended as this
The restriction of invention.Unless context clearly dictates otherwise, then singulative is intended to also include plural form.
When using term " to include " in this manual and/or time " including ", these terms specify described feature,
The existence of entirety, step, operation, element and/or parts, but be also not excluded for more than one other feature, entirety, step,
The existence of operation, element, parts and/or its group and/or additional.
About embodiment:
Referring to Fig. 2, Fig. 2 is the present invention block diagram for the drive circuit of LED device, the described driving for LED device
Circuit is for the voltage by an input voltage conversion to applicable driving LED device, to drive described LED device.Described driving electricity
Road includes low voltage difference stable-pressure device 210, increasing apparatus 220 and feedback device 230.
Described low voltage difference stable-pressure device 210 includes the first input pin 211, in order to coupled to the input voltage vin of outside,
To produce a low current and the first stable output voltage V1.This increasing apparatus 220 coupled to this low voltage difference stable-pressure device 210,
To be boosted according to certain multiplying power by this first output voltage V1, the driving required for this LED device can be driven obtaining one
Voltage Vd, and being exported by an output connecting pin 221, this increasing apparatus 220 increase multiplying power can be 1.5 times, 2.0 times, 2.5 times, 3.0
Times.It is second defeated that this feedback device 230 coupled to the output connecting pin 221 of this increasing apparatus 220 and this low voltage difference stable-pressure device 210
Enter pin 212, so that the driving voltage Vd of this output is fed back to this low voltage difference stable-pressure device 210.Please continue to refer to shown in Fig. 3,
In present embodiment, described increasing apparatus 220 is made up of seven field-effect transistor S1-S7, and concrete mode repeats no more.Please continue
Continuous with reference to shown in Fig. 4, for the circuit diagram of present invention driver circuit, wherein, this low voltage difference stable-pressure device 210 includes operational amplifier
213 and PMOS transistor 214, the first input pin 211 (end of oppisite phase input pin) of this operational amplifier 213 is connected to input
Voltage Vin, its second input pin 212 (non-oppisite phase end input pin) is connected to the end point of this feedback device 230, its output
End is connected to the grid of this PMOS transistor 214, and the source electrode of this PMOS transistor 214 is connected to high potential Vdd, its connection that drains
To this increasing apparatus 220.Described feedback device 230 includes the first resistance 231 and the second resistance 232, described first resistance 231 with
Second resistance 232 is connected in series, and the first end of described first resistance 231 is connected to the output connecting pin 221 of this increasing apparatus 220,
Second end is connected to the second input pin 212 and the first end of this second resistance 232 of this low voltage difference stable-pressure device 210, and this is the years old
Second end of two resistance 212 is connected to an electronegative potential.The operation principle of present invention driver circuit will be carried out simply below
Describe:
Described drive circuit first by the input voltage vin of 3.6V by low voltage difference stable-pressure device 210, and obtain one and stablize the of 3V
The first output voltage V1 of one output voltage V1, this stable 3V obtains one increase driving to 4.5V through this increasing apparatus 220
Galvanic electricity pressure Vd.When this driving voltage Vd declines because of load or other factors, owing to there is feedback device 230, this computing
Voltage Va on second input pin 212 of amplifier 213 also and then reduces, and makes the output voltage of this operational amplifier 213
Also reduce, and the voltage in this PMOS transistor is reduced, therefore this first output voltage V1 rises, press-fit through this liter
Put 220 and make this driving voltage Vd increase.When this driving voltage Vd rises because of load or other factors, owing to this is anti-
The event of feedback device 230, the voltage Va on the second input pin 212 of this operational amplifier 213 also and then rises, and makes this computing
The output voltage of amplifier 213 also rises, and the voltage in this PMOS transistor is increased, therefore this first output voltage
V1 declines, and through this increasing apparatus 220, this driving voltage Vd is declined.As shown in the above description, the present invention is anti-by this
Feedback device 230, and this driving voltage Vd can stably be exported, simultaneously by the driving of the outfan using this increasing apparatus 220
Voltage Vd, as feedback voltage, compares existing drive circuit, and drive circuit of the present invention more can reflect the shape of load
Condition, and carry out the automatic adjustment of this driving voltage Vd.It addition, the input voltage vin of 3.6V is first passed through this low voltage difference by the present invention
Stable-pressure device 210, and obtain a first output voltage V1 stablizing 3V, 7.2V is changed by its conversion efficiency more than in prior art
Become 4.5V.
These are only embodiments of the present invention, not thereby limit the scope of the claims of the present invention, every utilize the present invention
Equivalent structure or equivalence flow process that description and accompanying drawing content are made convert, or are directly or indirectly used in other relevant technology
Field, is the most in like manner included in the scope of patent protection of the present invention.
Claims (6)
1. the drive circuit for LED device, it is characterised in that: described drive circuit include a low voltage difference stable-pressure device,
One increasing apparatus and a feedback device, described low voltage difference stable-pressure device includes one first input pin, in order to coupled to outside
Input voltage, to produce a low current and the first stable output voltage；Described increasing apparatus coupled to this low voltage difference voltage stabilizing dress
Put, so that this first output voltage is boosted according to certain multiplying power, with obtain one can drive needed for this LED device driving electricity
Pressure, and by an output connecting pin output；Described feedback device coupled to output connecting pin and this low voltage difference voltage stabilizing dress of this increasing apparatus
The the second input pin put, to feed back to this low voltage difference stable-pressure device by the driving voltage of output.
2. drive circuit as claimed in claim 1, it is characterised in that: described increasing apparatus increase multiplying power be 1.5 times, 2.0
Again, 2.5 times or 3.0 times.
3. drive circuit as claimed in claim 2, it is characterised in that: described feedback device includes the first resistance being connected in series
And second resistance.
4. drive circuit as claimed in claim 3, it is characterised in that: the first end of described first resistance is connected to this liter and press-fits
The output connecting pin put, the second end is connected to the second input pin and the first end of this second resistance of this low voltage difference stable-pressure device,
Second end of this second resistance is connected to an electronegative potential.
5. drive circuit as claimed in claim 1, it is characterised in that: this low voltage difference stable-pressure device include an operational amplifier and
One transistor.
6. drive circuit as claimed in claim 5, it is characterised in that: described transistor is PMOS transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610626028.5A CN106163006A (en) | 2016-08-03 | 2016-08-03 | Drive circuit for LED device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610626028.5A CN106163006A (en) | 2016-08-03 | 2016-08-03 | Drive circuit for LED device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106163006A true CN106163006A (en) | 2016-11-23 |
Family
ID=57328519
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610626028.5A Pending CN106163006A (en) | 2016-08-03 | 2016-08-03 | Drive circuit for LED device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106163006A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018023486A1 (en) * | 2016-08-03 | 2018-02-08 | 袁志贤 | Drive circuit for use in led device |
| CN111522385A (en) * | 2020-06-23 | 2020-08-11 | 上海安路信息科技有限公司 | Low dropout regulator of PMOS output power tube |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1866342A (en) * | 2006-06-15 | 2006-11-22 | 佛山普立华科技有限公司 | Backlight drive circuit |
| CN203368874U (en) * | 2013-08-20 | 2013-12-25 | 翁巧慧 | LED lighting energy-saving circuit |
| CN104883780A (en) * | 2015-05-19 | 2015-09-02 | 深圳创维－Rgb电子有限公司 | Multichannel dual-mode digital control LED driving circuit and LED lamp |
| CN205847681U (en) * | 2016-08-03 | 2016-12-28 | 袁志贤 | Drive circuit for LED device |
-
2016
- 2016-08-03 CN CN201610626028.5A patent/CN106163006A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1866342A (en) * | 2006-06-15 | 2006-11-22 | 佛山普立华科技有限公司 | Backlight drive circuit |
| CN203368874U (en) * | 2013-08-20 | 2013-12-25 | 翁巧慧 | LED lighting energy-saving circuit |
| CN104883780A (en) * | 2015-05-19 | 2015-09-02 | 深圳创维－Rgb电子有限公司 | Multichannel dual-mode digital control LED driving circuit and LED lamp |
| CN205847681U (en) * | 2016-08-03 | 2016-12-28 | 袁志贤 | Drive circuit for LED device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018023486A1 (en) * | 2016-08-03 | 2018-02-08 | 袁志贤 | Drive circuit for use in led device |
| CN111522385A (en) * | 2020-06-23 | 2020-08-11 | 上海安路信息科技有限公司 | Low dropout regulator of PMOS output power tube |
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Application publication date: 20161123 |
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| WD01 | Invention patent application deemed withdrawn after publication |