CN201623903U - Current sharing control circuit of inductive light emitting diode (LED) - Google Patents
Current sharing control circuit of inductive light emitting diode (LED) Download PDFInfo
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- CN201623903U CN201623903U CN2010201410439U CN201020141043U CN201623903U CN 201623903 U CN201623903 U CN 201623903U CN 2010201410439 U CN2010201410439 U CN 2010201410439U CN 201020141043 U CN201020141043 U CN 201020141043U CN 201623903 U CN201623903 U CN 201623903U
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Abstract
The utility model discloses a current sharing control circuit of an inductive light emitting diode (LED). The current sharing control circuit comprises a signal generation unit, a control unit electrically connected to the signal generation unit, a current sharing unit electrically connected to a first diode and a light emitting unit parallelly connected with a capacitor. Driving voltage, provided by the signal generation unit, is controlled by the control unit to provide the needed driving voltage for the light emitting unit, meanwhile, current sharing control is achieved in the current sharing unit, thereby effectively providing a stable current source for the light emitting unit to realize the same brightness of the LEDs.
Description
Technical field
The utility model refers to a kind of in order to the inductance type light-emitting diode equalizing control circuit of light-emitting diode serial one constant current source to be provided relevant for a kind of inductance type light-emitting diode equalizing control circuit especially.
Background technology
Light-emitting diode (Light Emitting Diode, LED) be a kind of low-voltage unilateal conduction assembly of current drives, the luminous flux that adds light-emitting diode itself changes to some extent along with the electric current that flows through this light-emitting diode, therefore provides a constant current source to supply with serial or the array be made up of light-emitting diode and can effectively make its brightness reach consistency.
Cooperate and consult Fig. 3, be the current-voltage characteristic curve figure of light-emitting diode.As seen from the figure, the I-E characteristic of light-emitting diode has non-linear and unidirectional conduction, and the great variety of the light-emitting diode tiny change of its forward voltage behind forward conduction will causing electric current, the light that adds light-emitting diode is exported the current related of direct and light-emitting diode, therefore the variation of the immediate current amount that causes for the change of avoiding applied voltage, a sharing control unit that can effectively electric current be maintained stationary value is the important core of LED driving circuit.
Generally commonly used at present and the most easy equalizing control circuit is made of the transistor current mirror, because transistor meeting consume electric power itself, add that those characteristics of transistor of forming current mirror are not quite similar, cause the electric current difference that flows through different light-emitting diode serial branch roads, the brightness that causes different light-emitting diode serial branch roads to be sent is inhomogeneous.
Summary of the invention
In view of prior art described, a purpose of the present utility model is to provide a kind of inductance type light-emitting diode equalizing control circuit, this inductance type light-emitting diode equalizing control circuit makes the luminosity unanimity of light-emitting diode serial in order to provide light-emitting diode serial one stable current source.
This inductance type light-emitting diode equalizing control circuit includes a signal generation unit, a control unit, one first diode, a current-sharing unit, a capacitor and a luminescence unit.This signal generation unit produces a driving voltage, and this control unit is electrically connected on this signal generation unit, to control this driving voltage; This first diode electrically is connected in this control unit, and this current-sharing unit is an inductor, and this current-sharing unit is electrically connected on this first diode; This capacitor electrode is connected in this inductor, and this luminescence unit is in parallel with this capacitor.
Utilize this control unit that this driving voltage is controlled, to provide this luminescence unit required driving voltage, and provide this current-sharing unit to reach sharing control, and can make the luminosity unanimity of those light-emitting diodes to provide this luminescence unit one stable current source effectively.
Described inductance type light-emitting diode equalizing control circuit also comprises one second diode, is electrically connected between this control unit and this first diode.
Described inductance type light-emitting diode equalizing control circuit also comprises a capacitor, is parallel to this luminescence unit.
This luminescence unit includes a plurality of light-emitting diodes that are connected in series with the forward bias voltage drop direction.
The utility model is reached the flow equalizing function of LED driving circuit by the inductor of this current-sharing unit, its whole circuit is very simple and with low cost, and can provide those light-emitting diodes one stable electric current effectively, make the luminosity of those light-emitting diodes stable.
Description of drawings
Fig. 1 is the circuit diagram of inductance type light-emitting diode equalizing control circuit of the present utility model;
The driving voltage waveform figure that Fig. 2 a is provided for signal generation unit of the present utility model;
Fig. 2 b is the flow through current waveform figure of this luminescence unit of inductance type light-emitting diode equalizing control circuit of the present utility model;
Fig. 3 is the current-voltage characteristic curve figure of light-emitting diode.
Wherein, Reference numeral:
10 signal generation units
20 control units
30 current-sharing unit
40 luminescence units
400 light-emitting diodes
The C capacitor
D1 first diode
D2 second diode
The Id electric current
VH high levle voltage
VL low level voltage
Embodiment
Cooperate and consult Fig. 1, be the circuit diagram of inductance type light-emitting diode equalizing control circuit of the present utility model.This inductance type light-emitting diode equalizing control circuit comprises a signal generation unit 10, a control unit 20, a current-sharing unit 30, a luminescence unit 40, a capacitor C, one first diode D1 and one second diode D2.
This signal generation unit 10 is in order to provide a driving voltage, to drive this inductance type light-emitting diode equalizing control circuit.In present embodiment, this driving voltage is an ac pulse voltage (shown in Fig. 2 a), to change the frequency of this driving voltage, can control the bright dark speed of this luminescence unit 40 by pulse width modulation control technology (PWM control) effectively.
This control unit 20 is electrically connected on this signal generation unit 10, this control unit 20 receives this driving voltage that is produced by this signal generation unit 10, except the required driving voltage of this luminescence unit 40 is provided, and send a control signal (not indicating) to its rear end circuit, change in order to the light and shade of controlling this luminescence unit 40.
This current-sharing unit 30 is electrically connected on this control unit 20, and this current-sharing unit 30 is an inductor, and this current-sharing unit 30 makes this luminescence unit 40 be maintained certain luminosity in order to this current source that luminescence unit 40 tends towards stability to be provided.In present embodiment, use an inductance value be the inductor of 100 microhenrys (μ H) reach current-sharing effect.
This luminescence unit 40 is electrically connected on this current-sharing unit 30, and wherein this luminescence unit 40 includes a plurality of light-emitting diodes that are connected in series 400.
This capacitor C is parallel to this luminescence unit 40, to filter by signal generation unit 10 or this control unit 20 luminous unusual pulse voltages, reduces the impact that this abnormal pulsers voltage is caused this luminescence unit 40.
This first diode D1 is arranged between this control unit 20 and this current-sharing unit 30, and is parallel to this current-sharing unit 20 and this luminescence unit 40, and this first diode D1 be provided with direction and those light-emitting diodes 400 that direction is set is opposite.
This second diode D2 is arranged between this control unit 20 and this current-sharing unit 30, mainly in order to avoiding causing this current-sharing unit 30 of this inductance type light-emitting diode equalizing control circuit or those light-emitting diodes 400 to damage by an abrupt voltage wave of this signal generation unit 10 outputs, and the situation that causes circuit to stop.
When this inductance type light-emitting diode equalizing control circuit was activated, this signal generation unit 10 produced an ac pulse voltage (shown in Fig. 2 a), and supposes that the high levle of this ac pulse voltage is V
H, low level is V
L, this ac pulse voltage is passed to this control unit 20 to control the light and shade of this luminescence unit 40.When this ac pulse voltage by low level voltage V
LBe converted to high levle voltage V
HThe time, the electric current by this current-sharing unit 30 begins to rise, and this current-sharing unit 30 is begun charging; And work as this ac pulse voltage by high levle voltage V
HBe converted to low level voltage V
LThe time, this current-sharing unit 30 enters discharge condition, and begins discharge by this first diode D1; Because the conducting voltage of those light-emitting diodes 400 is fixed, therefore the voltage that is across these 30 two ends, current-sharing unit adds the electric current I by this current-sharing unit 30 along with this ac pulse voltage changes up and down
dAlso along with this ac pulse voltage change (shown in Fig. 2 b), therefore, the electric current of this luminescence unit 40 of flowing through is a fixed value, and what so can make those light-emitting diodes 400 reaches the brightness unanimity.
Comprehensive the above, the utility model is reached the flow equalizing function of LED driving circuit by the inductor of this current-sharing unit 30, its whole circuit is very simple and with low cost, and can provide those light-emitting diodes one stable electric current effectively, make the luminosity of those light-emitting diodes stable.
The above; it only is preferred embodiment of the present utility model; when can not limiting the scope that the utility model is implemented, promptly all equalizations of doing according to the utility model claim change and revise etc., all should still belong to the category of patent covering scope intention of the present utility model protection.
Claims (4)
1. an inductance type light-emitting diode equalizing control circuit is characterized in that, comprises:
One signal generation unit produces a driving voltage;
One in order to control the control unit of this driving voltage, is electrically connected on this signal generation unit;
One first diode is electrically connected on this control unit;
One current-sharing unit is electrically connected on this first diode, and wherein this current-sharing unit is an inductor;
One luminescence unit is electrically connected on this current-sharing unit.
2. inductance type light-emitting diode equalizing control circuit as claimed in claim 1 is characterized in that, also comprises one second diode, is electrically connected between this control unit and this first diode.
3. inductance type light-emitting diode equalizing control circuit as claimed in claim 1 is characterized in that, also comprises a capacitor, is parallel to this luminescence unit.
4. inductance type light-emitting diode equalizing control circuit as claimed in claim 1 is characterized in that this luminescence unit includes a plurality of light-emitting diodes that are connected in series with the forward bias voltage drop direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201410439U CN201623903U (en) | 2010-03-10 | 2010-03-10 | Current sharing control circuit of inductive light emitting diode (LED) |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201410439U CN201623903U (en) | 2010-03-10 | 2010-03-10 | Current sharing control circuit of inductive light emitting diode (LED) |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201623903U true CN201623903U (en) | 2010-11-03 |
Family
ID=43027355
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201410439U Expired - Fee Related CN201623903U (en) | 2010-03-10 | 2010-03-10 | Current sharing control circuit of inductive light emitting diode (LED) |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201623903U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107635312A (en) * | 2015-06-19 | 2018-01-26 | 青岛海信电器股份有限公司 | A kind of LED drive circuit and liquid crystal display device |
-
2010
- 2010-03-10 CN CN2010201410439U patent/CN201623903U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107635312A (en) * | 2015-06-19 | 2018-01-26 | 青岛海信电器股份有限公司 | A kind of LED drive circuit and liquid crystal display device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101103 Termination date: 20120310 |