CN201039518Y - Multi-level LED drive circuit using multiple constant current deviated voltage - Google Patents
Multi-level LED drive circuit using multiple constant current deviated voltage Download PDFInfo
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- CN201039518Y CN201039518Y CNU2007200686810U CN200720068681U CN201039518Y CN 201039518 Y CN201039518 Y CN 201039518Y CN U2007200686810 U CNU2007200686810 U CN U2007200686810U CN 200720068681 U CN200720068681 U CN 200720068681U CN 201039518 Y CN201039518 Y CN 201039518Y
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- constant current
- led
- constant
- row
- led drive
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Abstract
The utility model provides a multilevel LED driven circuit which adopts a plurality of constant current bias voltages, relating to the constant current driven circuit. The existing multilevel LED driven circuit adopts the mode of opening one by one, the interference between different levels occurs. The multilevel LED drive circuit of the utility model is formed by n rows of same LED driven sub-circuits that are parallel connected with each other and the rows are lightened one by one; and the each row of the LED driven sub-circuits at least comprises LBDs which are connected with each other in series and a constant current mould; and the multilevel LED driven circuit provides m constant current bias voltage and the constant current driven mould of each row LED drive sub-circuit is connected to a constant current bias voltage by a switch; wherein, m is more than 1 but less than or equal to n, wherein, the m and the n all are natural number. By adopting the utility model, the interference problems between different levels that the multilevel LED uses one constant current bias voltage together can be effectively solved.
Description
Technical field
The utility model relates to constant-current drive circuit, relates in particular to a kind of multi-stage LED driving circuit.
Background technology
At present, light-emitting diode (LED) is used for information in a large number and is shown and lighting technology that its application in each field is just day by day extensive.In order to make LED reach good display effect, need provide the drive circuit of superior performance, with the uniformity that guarantees LED brightness and light speed faster.In addition, for the multi-stage LED circuit, also need to provide the effective mechanism that prevents that inter-stage from disturbing.
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 voltage source 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 first pin 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 can preventing.
The utility model content
The purpose of this utility model is to provide a kind of multi-stage LED driving circuit that adopts a plurality of constant biasing voltages, to solve the inter-stage interference problem that the shared constant biasing voltage of multi-stage LED causes.
To achieve the above object, the utility model provides a kind of multi-stage LED driving circuit that adopts a plurality of constant biasing voltages, be formed in parallel by the identical LED drive sub-circuits of n row, 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, described multi-stage LED driving circuit provides m constant biasing voltage, the constant-current driven module of every row LED drive sub-circuits is connected to some constant biasing voltage by a switch, wherein, 1＜m≤n, m, n are natural number.
In the multi-stage LED driving circuit of a plurality of constant biasing voltages of above-mentioned employing, the magnitude of voltage that m constant biasing voltage provides is identical.
In the multi-stage LED driving circuit of a plurality of constant biasing voltages of above-mentioned employing, n is the integral multiple of m.
In the multi-stage LED driving circuit of a plurality of constant biasing voltages of above-mentioned employing, if n/m=k, the then shared constant biasing voltage of k row LED drive sub-circuits.
Multi-stage LED driving circuit of the present utility model provides voltage signal to LED drive sub-circuits at different levels respectively by adopting a plurality of constant biasing voltages, can avoid or effectively slow down the problem of inter-stage interference.
Description of drawings
By following examples and in conjunction with the description of its accompanying drawing, can further understand its practical novel purpose, specific structural features and advantage.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 utility model.
Embodiment
Multi-stage LED driving circuit to a plurality of constant biasing voltages of employing of the present utility model is described in further detail below.
Multi-stage LED driving circuit of the present utility model is formed in parallel by the identical LED drive sub-circuits of n row, 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.
Each pin of this led drive circuit comprises light-emitting diode and the constant-current driven module that is connected in series at least, and the constant biasing voltage V of a plurality of voltage sources to provide m numerical value to equate is provided whole multi-stage LED driving circuit
REFThe constant-current driven module I of each pin
1, I
2..., I
NBy corresponding switch S
1, S
2..., S
NBe connected to some constant biasing voltage V
REF, and m, n satisfy: 1＜m≤n, and m, n are natural number, and n is the integral multiple of m.
Referring to Fig. 2, in preferred embodiment of the present utility model, adopt N constant biasing voltage V
REFThe structure of corresponding N pin, promptly each pin has its independently voltage source, thereby no matter adopt opens simultaneously or lights LED by being listed as the mode of opening
1, LED
2..., LED
N, all can avoid the generation of interference problem between pin.
In other embodiment of the present utility model, also can adopt N/2, N/3 or other a quantity constant biasing voltage V
REFN pin powered, and promptly per two, the shared voltage signal of three or more pin can effectively be alleviated the problem of disturbing between pin equally.
Claims (4)
1. multi-stage LED driving circuit that adopts a plurality of constant biasing voltages, be formed in parallel by the identical LED drive sub-circuits of n row, 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, it is characterized in that: described multi-stage LED driving circuit provides m constant biasing voltage, the constant-current driven module of every row LED drive sub-circuits is connected to some constant biasing voltage by a switch, wherein, 1＜m≤n, m, n are natural number.
2. the multi-stage LED driving circuit of a plurality of constant biasing voltages of employing as claimed in claim 1 is characterized in that: the magnitude of voltage that m constant biasing voltage provides is identical.
3. the multi-stage LED driving circuit of a plurality of constant biasing voltages of employing as claimed in claim 1 is characterized in that: n is the integral multiple of m.
4. the multi-stage LED driving circuit of a plurality of constant biasing voltages of employing as claimed in claim 3 is characterized in that: if n/m=k, the then shared constant biasing voltage of k row LED drive sub-circuits.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200686810U CN201039518Y (en) | 2007-04-06 | 2007-04-06 | Multi-level LED drive circuit using multiple constant current deviated voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200686810U CN201039518Y (en) | 2007-04-06 | 2007-04-06 | Multi-level LED drive circuit using multiple constant current deviated voltage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201039518Y true CN201039518Y (en) | 2008-03-19 |
Family
ID=39212048
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200686810U Expired - Lifetime CN201039518Y (en) | 2007-04-06 | 2007-04-06 | Multi-level LED drive circuit using multiple constant current deviated voltage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201039518Y (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 CNU2007200686810U patent/CN201039518Y/en not_active Expired - Lifetime
Cited By (2)
| 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 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20080319 |
|
| CX01 | Expiry of patent term |