CN201623904U - Current equalizing control circuit of capacitance type light-emitting diodes - Google Patents
Current equalizing control circuit of capacitance type light-emitting diodes Download PDFInfo
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- CN201623904U CN201623904U CN2010201410443U CN201020141044U CN201623904U CN 201623904 U CN201623904 U CN 201623904U CN 2010201410443 U CN2010201410443 U CN 2010201410443U CN 201020141044 U CN201020141044 U CN 201020141044U CN 201623904 U CN201623904 U CN 201623904U
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Abstract
The utility model discloses a current equalizing control circuit of capacitance type light-emitting diodes, including a signal generation unit, a control unit, a current equalizing unit and a light-emitting unit. The control unit controls the signal generation unit to generate a drive voltage so as to provide a required drive voltage of the light-emitting unit, and controls the current equalizing unit to provide a stable current for the light-emitting diodes so as to stabilize the lighting brightness of the light-emitting diodes.
Description
Technical field
The utility model refers to a kind of in order to the condenser type light-emitting diode equalizing control circuit of light-emitting diode serial one constant current source to be provided relevant for a kind of condenser 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.
And at present general commonly used and the most easy light-emitting diode equalizing control circuit is mainly the transistor current mirror and constitutes, and as shown in Figure 1, is the circuit diagram of existing led array circuit.This light emitting diode matrix includes a plurality of light-emitting diode serials 40, and a plurality of two-carrier junction transistor (BipolarJunction Transistor, the current mirror of BJT) being formed 50.In order to make this current mirror normal operation, except respectively this characteristics of transistor that makes this current mirror is necessary identical, must guarantee that still each transistor operates in the active region.
Yet, because its conducting voltage difference to some extent forward of different light-emitting diode, add this light-emitting diode serial 40 and be connected to same input power supply jointly, to cause the driving voltage of different crystal pipe that slightly difference is arranged, and cause the part driving voltage to be lower than the operating voltage that this current mirror 50 operates in active region, make the electric current that flows through those light-emitting diode serials 40 be not quite similar, and the brightness that causes light-emitting diode serial 40 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 condenser type light-emitting diode equalizing control circuit, this condenser 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.
For reaching above-mentioned purpose, condenser type light-emitting diode equalizing control circuit of the present utility model includes a signal generation unit, a control unit, a current-sharing unit and a luminescence unit.
This signal generation unit produces a driving voltage, and this control unit is electrically connected to this signal generation unit, to control this driving voltage; This current-sharing unit is a capacitor, is electrically connected to this control unit.This luminescence unit is electrically connected to this current-sharing unit, and this luminescence unit includes one first light-emitting diode serial and one second light-emitting diode serial; This first light-emitting diode serial is made up of a plurality of light-emitting diodes that are connected in series with the forward bias voltage drop direction; This second light-emitting diode serial system is made up of a plurality of light-emitting diodes that are connected in series with the reverse bias direction, and wherein this first light-emitting diode serial and this second light-emitting diode serial are connected in parallel.
By this, utilize this control unit that this driving voltage is controlled, providing 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.
Each luminescence unit also includes two protection diodes, is connected between this current-sharing unit and this first light-emitting diode serial and between this current-sharing unit and this second light-emitting diode serial.
Described condenser type light-emitting diode equalizing control circuit also comprises a current-limiting resistor, is electrically connected on this luminescence unit, damages because of overcurrent to prevent this luminescence unit.
Each luminescence unit also comprises two capacitor for voltage protections, is parallel to this first light-emitting diode serial and this second light-emitting diode serial of this luminescence unit respectively.
This condenser type light-emitting diode equalizing control circuit of the present utility model can provide light-emitting diode serial one stable current source, makes the luminosity unanimity of light-emitting diode serial.
Description of drawings
Fig. 1 is the circuit diagram of existing led array circuit;
Fig. 2 is the circuit diagram of condenser type light-emitting diode equalizing control circuit of the present utility model;
The driving voltage waveform that Fig. 3 is provided for signal generation unit of the present utility model;
Fig. 4 is the current waveform of light-emitting diode sharing control.
Wherein, Reference numeral:
40 light-emitting diode serials
50 current mirrors
10 signal generation units
20 control units
30 current-sharing unit
40 luminescence units
42 first light-emitting diode serials
44 second light-emitting diode serials
400 light-emitting diodes
The C capacitor for voltage protection
D protects diode
The Id drive current
The R1 current-limiting resistor
The Vp crest voltage
Embodiment
Cooperate and consult Fig. 2, be the circuit diagram of condenser type light-emitting diode equalizing control circuit of the present utility model.This condenser type light-emitting diode equalizing control circuit makes the luminosity unanimity of each light-emitting diode serial in order to a plurality of light-emitting diode serials stable current source uniformly to be provided.This condenser type light-emitting diode equalizing control circuit includes a signal generation unit 10, a control unit 20, at least one current-sharing unit 30, at least one luminescence unit 40 and a current-limiting resistor R1.
This signal generation unit 10 is in order to a driving voltage (not indicating) to be provided, to drive this condenser type light-emitting diode equalizing control circuit.In present embodiment, this driving voltage is the periodic AC signal of a tool (as shown in Figure 3); In addition, can control the bright dark speed of this luminescence unit 40 effectively by pulse width modulation control technology (PWM control) to change the frequency of this driving voltage.
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 30 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 30.
This current-sharing unit 30 is electrically connected to this control unit 20, and this current-sharing unit 30 is in order to provide this luminescence unit 40 1 stable current source, makes the luminosity unanimity of this luminescence unit 30, and wherein this current-sharing unit 30 is a capacitor.In present embodiment, the use capacitance is that the capacitor of 90 nanofarads (nF) is reached the effect of electric current current-sharing.
This luminescence unit 40 includes one first light-emitting diode serial 42, and one second light-emitting diode serial 44, and this first light-emitting diode serial 42 is connected in parallel with this second light-emitting diode serial 44.Wherein this first light-emitting diode serial 42 includes a plurality of light-emitting diodes 400 that are connected in series with the forward bias voltage drop direction; Similarly, this second light-emitting diode serial 44 includes a plurality of light-emitting diodes 400 that are connected in series with the reverse bias direction.Those light-emitting diodes 400 adopt series system to connect, the anodal anticathode that also is about to a plurality of light-emitting diodes 400 connects bunchiness, its advantage is for all identical by the operating current of each light-emitting diode 400 in the same serial, so the luminosity unanimity of those light-emitting diodes 400 in this same serial.
In addition; this first light-emitting diode serial 42 comprises a plurality of capacitor for voltage protection C that are parallel to those light-emitting diodes 400 respectively with this second light-emitting diode serial 44; this capacitor for voltage protection C reduces the impact that this abnormal pulsers voltage is caused this first light-emitting diode serial 42 and this second light-emitting diode serial 44 in order to filter abnormal pulsers voltage.
This luminescence unit 40 also comprises two protection diode D, is electrically connected on respectively between this current-sharing unit 30 and this first light-emitting diode serial 42, and between this current-sharing unit 30 and this second light-emitting diode serial 44.Those protections diode D is mainly in order to preventing that unusual revers voltage from directly puncturing those light-emitting diodes 300, and then damages those light-emitting diodes 400.
When practical operation, it is that the AC signal (as shown in Figure 3) of Vp is used for back-end circuit that this signal generation unit 10 provides a crest voltage, can control the light and shade of this luminescence unit 30 effectively by this control unit 20.After this AC signal is passed through this control unit 20, the conducting voltage of supposing those light-emitting diodes 400 is Vx, then this AC signal voltage swing of being higher than this conducting voltage Vx or being lower than this conducting voltage negative value-Vx provides the capacitor of this current-sharing unit 30 to discharge and recharge, can provide this drive current Id that luminescence unit 40 1 tends towards stability (as shown in Figure 4) effectively by charge and discharge process, make the brightness unanimity of those light-emitting diodes 400.
In addition, be worth mentioning, the condensance value of this current-sharing unit 30 is the capacitance of this current-sharing unit 30 and the inverse of frequency of operation product, therefore, each luminescence unit 40 and the whole branch impedance value of corresponding this current-sharing unit 30 just equal this condensance value and this first light-emitting diode serial 42 and this second light-emitting diode serial 44 resistance value sums own of this current-sharing unit 30.So, can be by the capacitance that improves this current-sharing unit 30, to increase the condensance value of this current-sharing unit 30, relatively, just can be with the influence of the resistance value that reduces those light-emitting diode serials (42,44) to whole branch impedance value.Also therefore,, when abnormal failure takes place in arbitrary light-emitting diode serial (42,44) of this luminescence unit 40, reduce widely, and reach the function of current-sharing and can suppress branch current owing to be subjected to the domination of the condensance value of this current-sharing unit 30.
This current-limiting resistor R1 those luminescence units 40 that are connected in series are flowed through the peak current of this first light-emitting diode serial 42 and this second light-emitting diode serial 44 within safe range in order to restriction, and are prevented that this luminescence unit 40 from damaging because of overcurrent.
When practical application, this current-sharing unit 30 and these luminescence units 40 are organized in parallel connection simultaneously more, form to have large-scale array light emitting module (as shown in Figure 2).When single light-emitting diode on a certain branch road 400 damages, the electric current by this branch road will increase, so the electric current that is dispensed to other light-emitting diode 400 in this branch road will increase, and be easy to damage other light-emitting diode 400 in this series arm.Therefore, this light-emitting diode 400 that can eliminate effectively in branch road by this current-sharing unit 40 damages the big electric current that moment produced, the electric current that is distributed in other light-emitting diode 400 in the branch road is still maintained in the rated range that light-emitting diode 400 can bear, so can not influence the operate as normal of other light-emitting diode 400.
Comprehensive the above, the utility model utilizes the capacitor of this current-sharing unit 30 to reach the flow equalizing function of LED driving circuit, 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 useful life of further having improved those light-emitting diodes.
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. the condenser type light-emitting diode equalizing control circuit of a light-emitting diode serial is characterized in that, comprises:
One signal generation unit produces a driving voltage;
One is used to control the control unit of this driving voltage, is electrically connected to this signal generation unit;
One current-sharing unit is electrically connected to this control unit, and wherein this current-sharing unit is a capacitor;
One luminescence unit is electrically connected to this current-sharing unit, and this luminescence unit comprises:
One first light-emitting diode serial is made up of a plurality of light-emitting diodes that are connected in series with the forward bias voltage drop direction; And
One second light-emitting diode serial is made up of a plurality of light-emitting diodes that are connected in series with the reverse bias direction,
Wherein this first light-emitting diode serial system is connected in parallel with this second light-emitting diode serial.
2. condenser type light-emitting diode equalizing control circuit as claimed in claim 1; it is characterized in that; each luminescence unit also includes two protection diodes, is connected between this current-sharing unit and this first light-emitting diode serial and between this current-sharing unit and this second light-emitting diode serial.
3. condenser type light-emitting diode equalizing control circuit as claimed in claim 1 is characterized in that, also comprises a current-limiting resistor, is electrically connected on this luminescence unit, damages because of overcurrent to prevent this luminescence unit.
4. condenser type light-emitting diode equalizing control circuit as claimed in claim 1 is characterized in that each luminescence unit also comprises two capacitor for voltage protections, is parallel to this first light-emitting diode serial and this second light-emitting diode serial of this luminescence unit respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201410443U CN201623904U (en) | 2010-03-10 | 2010-03-10 | Current equalizing control circuit of capacitance type light-emitting diodes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201410443U CN201623904U (en) | 2010-03-10 | 2010-03-10 | Current equalizing control circuit of capacitance type light-emitting diodes |
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| CN201623904U true CN201623904U (en) | 2010-11-03 |
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| CN2010201410443U Expired - Fee Related CN201623904U (en) | 2010-03-10 | 2010-03-10 | Current equalizing control circuit of capacitance type light-emitting diodes |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102740535A (en) * | 2011-04-12 | 2012-10-17 | 青岛海信电器股份有限公司 | Driving circuit and liquid crystal display (LCD) television |
| WO2013097620A1 (en) * | 2011-12-25 | 2013-07-04 | Ma Lijuan | Multipath load drive circuit |
| CN104465921A (en) * | 2014-12-24 | 2015-03-25 | 中国科学院半导体研究所 | Light emitting diode integrated chip of capacitive structure and manufacturing method of light emitting diode integrated chip |
| 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 CN2010201410443U patent/CN201623904U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102740535A (en) * | 2011-04-12 | 2012-10-17 | 青岛海信电器股份有限公司 | Driving circuit and liquid crystal display (LCD) television |
| WO2013097620A1 (en) * | 2011-12-25 | 2013-07-04 | Ma Lijuan | Multipath load drive circuit |
| CN104465921A (en) * | 2014-12-24 | 2015-03-25 | 中国科学院半导体研究所 | Light emitting diode integrated chip of capacitive structure and manufacturing method of light emitting diode integrated chip |
| CN104465921B (en) * | 2014-12-24 | 2017-06-20 | 中国科学院半导体研究所 | Light emitting diode integrated chip of capacitance type structure and preparation method thereof |
| 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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| 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 |