CN101043778A - Multi-stage LED driving circuit for preventing interstage interference - Google Patents
Multi-stage LED driving circuit for preventing interstage interference Download PDFInfo
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- CN101043778A CN101043778A CNA2007100391895A CN200710039189A CN101043778A CN 101043778 A CN101043778 A CN 101043778A CN A2007100391895 A CNA2007100391895 A CN A2007100391895A CN 200710039189 A CN200710039189 A CN 200710039189A CN 101043778 A CN101043778 A CN 101043778A
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Abstract
The provided multi-level LED constant-current drive circuit for anti-interference comprises some columns of drive sub-circuits every with LED of same number, every column LED drive sub-circuit includes at least the serial LED, a constant-current drive module, a offset module to provide constant-offset voltage for the drive module, and a serial control-current module. This invention can ensure lighting the multi-level LED drive circuit column by column while inhibiting the inter-level interference efficiently.
Description
Technical field
The present invention relates to constant-current drive circuit, relate in particular to a kind of multi-stage LED driving circuit.
Background technology
The continuous popularization of in each field, using along with light-emitting diode (LED), people also day by day improve the performance requirement of led drive circuit, should make LED keep brightness even, accelerate to light the speed of LED again as far as possible, this is undoubtedly a kind of higher level challenge to the design of multi-stage LED driving circuit.
Existing multi-stage LED driving circuit as shown in Figure 1, the LED drive sub-circuits (pin) identical by ordered series of numbers is formed in parallel, each pin comprises light-emitting diode and the constant-current driven module that is connected in series at least, adopts the shared bias voltage V of a plurality of pin usually
REFDesign, by the constant-current driven module I of same biasing module to each pin
1, I
2..., I
NConstant biasing voltage V is provided
REF, and by K switch
1, K
2..., K
NAnd G
1, G
2..., G
NControl the operating state of each pin respectively.
For first pin, its opening procedure is as follows: open switch S
1, Closing Switch K
1The bias voltage of constant-current driven module by 0 to V
REFChange, output driving current is also increased gradually by zero beginning simultaneously.Be stabilized in V until bias voltage
REF, current constant output.If open a plurality of pin simultaneously, then can cause very big impact to electric current, shorten the useful life of circuit easily.
To the impact of electric current, another kind of method commonly used is to adopt the mode of opening by row in order to reduce to open, i.e. Closing Switch K one by one
1, K
2..., K
N, light each pin successively.Adopt this method can effectively reduce rush of current, still can cause between pin and disturb.For example, as the LED of first pin
1After normally lighting, the output of biasing circuit and constant-current driven module I
1Input voltage be stabilized in V
REF, and then light the LED of second pin
2The time, in K switch
2Closure in a flash, the output loading of biasing circuit has increased by one times quickly, because the fan-out capability of biasing circuit is limited after all, therefore original stable state is broken, electric charge is redistributed, and the bias voltage of first pin descends, and drive current also descends, As time goes on, the bias voltage of first and second pin constant-current driven modules finally is stabilized in V again
REF, output driving current reaches set point.But at K
2Caused LED in the closed process
1Drive current descend, cause LED
1Brightness reduce, and when a back pin opens, all can cause interference to the pin that has normally opened before.
Therefore, need a kind of led drive circuit of disturbing between pin of preventing.
Summary of the invention
The object of the present invention is to provide a kind of multi-stage LED driving circuit that prevents that inter-stage from disturbing, with the generation of guaranteeing that multi-stage LED driving circuit also effectively disturbs between killer stage under the mode of opening by row.
To achieve the above object, the invention provides a kind of multi-stage LED driving circuit that prevents that inter-stage from disturbing, the LED drive sub-circuits identical by ordered series of numbers is formed in parallel, adopt the mode of opening by row to light, described every row LED drive sub-circuits comprises light-emitting diode and the constant-current driven module that is connected in series at least, and provide constant biasing voltage to the constant-current driven module of described every row LED drive sub-circuits by a biasing module, wherein, also be in series with a control module on described every row LED drive sub-circuits, be used to control the size of current of these row LED drive sub-circuits.
Prevent in the multi-stage LED driving circuit that inter-stage disturbs that above-mentioned described control module is used to control the current switching of the LED drive sub-circuits at its place.
In the above-mentioned multi-stage LED driving circuit that prevents the inter-stage interference, described control module is a switch, further, described switch is a digital switch, it opens and closes by a Digital Signals, and control respectively is listed as between the digital signal that the digital switch of LED drive sub-circuits opens and closes and has certain time-delay.
Prevent in the multi-stage LED driving circuit that inter-stage disturbs that above-mentioned the electric current that described control module is used to control the LED drive sub-circuits at its place changes to one second value from one first value.
In the above-mentioned multi-stage LED driving circuit that prevents the inter-stage interference, described control module is a switches set.
Multi-stage LED driving circuit of the present invention, adopt the mode of opening by row to control the operating state of every row LED drive sub-circuits, by on constant-current driven module, applying constant bias voltage, and control module is set in every row LED drive sub-circuits comes the Control current break-make or regulate size of current, biasing module has prevented the generation that inter-stage disturbs to the charging process of constant-current driven module in the time of can avoiding lighting at every turn.
Description of drawings
By following examples and in conjunction with the description of its accompanying drawing, can further understand purpose, specific structural features and the advantage of its invention.Wherein, accompanying drawing is:
Fig. 1 is the schematic diagram of existing multi-stage LED driving circuit;
Fig. 2 is the schematic diagram of multi-stage LED driving circuit of the present invention.
Embodiment
Below the multi-stage LED driving circuit that prevents that inter-stage from disturbing of the present invention is described in further detail.
Referring to Fig. 2, multi-stage LED driving circuit of the present invention is formed in parallel by the identical LED drive sub-circuits of ordered series of numbers, adopts the mode of opening by row to light, and for convenience of description, below abbreviates each row LED drive sub-circuits as a pin.
In this multi-stage LED driving circuit, each pin comprises light-emitting diode, constant-current driven module and the control module that is connected in series at least.Constant-current driven module is accepted the constant biasing voltage V that biasing module produces
REF, provide constant electric current to light-emitting diode, by regulating bias voltage V
REFThe size constant current size that can regulate constant-current driven module.Control module is used to control the size of current of the pin at its place.
In preferred embodiment of the present invention, control module adopts digital switch S
1, S
2..., S
NRealize, and be arranged on the LED of each pin
1, LED
2..., LED
NWith constant-current driven module I
1, I
2..., I
NBetween.When switch closure, the pin conducting at its place, light-emitting diode is lighted.Each digital switch can be by Digital Signals, has the digital signal of certain time-delay by input, can control S successively
1, S
2..., S
NClosure, thus light LED one by one
1, LED
2..., LED
N
Because each constant-current driven module I
1, I
2..., I
NThe voltage of input also remains on V under off-mode
REF, therefore, when control module makes the current lead-through of pin at its place, the output loading of biasing module is fixed, so when a back pin opens, can't cause interference to the pin that has normally opened before, thereby efficiently solve the problem of disturbing between pin.
In another embodiment of the present invention, control module also can adopt switches set to realize, the electric current of LED drive sub-circuits that is used to control its place is from one first value saltus step or be gradient to one second value, regulates the brightness of LED, and also can effectively prevent the generation disturbed between pin in this process.
In addition, the position that is provided with of control module is not limited between light-emitting diode and the constant-current driven module, also can be arranged on light-emitting diode and the power supply V of each pin as shown in Figure 2
DDBetween, perhaps between the constant-current driven module of each pin and the ground GND.
The multi-stage LED driving circuit that prevents that inter-stage from disturbing of the present invention, can be applicable to all kinds ofly needs to adopt a plurality of or organizes circuit or the system of LED more.
Claims (7)
1, a kind of multi-stage LED driving circuit that prevents that inter-stage from disturbing, the LED drive sub-circuits identical by ordered series of numbers is formed in parallel, adopt the mode of opening by row to light, described every row LED drive sub-circuits comprises light-emitting diode and the constant-current driven module that is connected in series at least, and provide constant biasing voltage to the constant-current driven module of described every row LED drive sub-circuits by a biasing module, it is characterized in that: also be in series with a control module on described every row LED drive sub-circuits, be used to control the size of current of these row LED drive sub-circuits.
2, the multi-stage LED driving circuit that prevents that inter-stage from disturbing as claimed in claim 1 is characterized in that: described control module is used to control the current switching of the LED drive sub-circuits at its place.
3, the multi-stage LED driving circuit that prevents that inter-stage from disturbing as claimed in claim 2, it is characterized in that: described control module is a switch.
4, the multi-stage LED driving circuit that prevents that inter-stage from disturbing as claimed in claim 3, it is characterized in that: described switch is a digital switch, by its switching of a Digital Signals.
5, the multi-stage LED driving circuit that prevents that inter-stage from disturbing as claimed in claim 4 is characterized in that: control respectively is listed as between the digital signal that the digital switch of LED drive sub-circuits opens and closes and has certain time-delay.
6, the multi-stage LED driving circuit that prevents that inter-stage from disturbing as claimed in claim 1 is characterized in that: the electric current that described control module is used to control the LED drive sub-circuits at its place changes to one second value from one first value.
7, the multi-stage LED driving circuit that prevents that inter-stage from disturbing as claimed in claim 6, it is characterized in that: described control module is a switches set.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100391895A CN101043778A (en) | 2007-04-06 | 2007-04-06 | Multi-stage LED driving circuit for preventing interstage interference |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100391895A CN101043778A (en) | 2007-04-06 | 2007-04-06 | Multi-stage LED driving circuit for preventing interstage interference |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101043778A true CN101043778A (en) | 2007-09-26 |
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ID=38808893
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007100391895A Pending CN101043778A (en) | 2007-04-06 | 2007-04-06 | Multi-stage LED driving circuit for preventing interstage interference |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101043778A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102612235A (en) * | 2012-04-07 | 2012-07-25 | 李桂宏 | Light-emitting diode (LED) illuminating device comprising multistage constant current drive circuit |
| CN101652006B (en) * | 2009-06-19 | 2013-01-23 | 杭州士兰微电子股份有限公司 | LED driving circuit as well as serial communication system therewith and communication method |
-
2007
- 2007-04-06 CN CNA2007100391895A patent/CN101043778A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101652006B (en) * | 2009-06-19 | 2013-01-23 | 杭州士兰微电子股份有限公司 | LED driving circuit as well as serial communication system therewith and communication method |
| CN102612235A (en) * | 2012-04-07 | 2012-07-25 | 李桂宏 | Light-emitting diode (LED) illuminating device comprising multistage constant current drive circuit |
| CN102612235B (en) * | 2012-04-07 | 2014-03-12 | 李桂宏 | Light-emitting diode (LED) illuminating device comprising multistage constant current drive circuit |
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| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20070926 |