CN202634782U - LED constant-current drive circuit - Google Patents
LED constant-current drive circuit Download PDFInfo
- Publication number
- CN202634782U CN202634782U CN 201220192184 CN201220192184U CN202634782U CN 202634782 U CN202634782 U CN 202634782U CN 201220192184 CN201220192184 CN 201220192184 CN 201220192184 U CN201220192184 U CN 201220192184U CN 202634782 U CN202634782 U CN 202634782U
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- led
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- constant
- current
- drive circuit
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Abstract
The utility model discloses an LED constant-current drive circuit, which mainly aims at providing an LED constant-current drive circuit with simple structure, low cost and high efficiency. The LED constant-current drive circuit comprises a power supply circuit, a constant current circuit and an LED group, wherein the constant current circuit and the LED group are electrically connected with the power supply circuit, LEDs of the LED group are connected in series, a voltage stabilizing tube is reversely connected to two ends of each LED in parallel, the constant current circuit comprises two sub circuits, and each sub circuit is composed a transistor, a voltage stabilizing tube and a resistor. According to the LED constant-current drive circuit, a voltage stabilizing tube is connected to each LED in parallel, thereby ensuring that the circuit can work normally when an LED is disconnected; and the constant current circuit is a linear constant current source, thereby providing stable current for each LED.
Description
Technical field
The utility model relates to a kind of LED constant-current drive circuit.
Background technology
LED is a cold light source, and operating voltage is low, light efficiency is high, is considered to the new light sources of 21 century illumination.Yet the LED lighting apparatus is thrown at present has the key issue that is generalizable to have two, the one, and on the high side; The 2nd, the control circuit instability causes the LED life-span to be reduced greatly.According to statistics; The failure of removal of LED white-light illuminating light fixture appearance at present; Be power issue about 70%, about 20% is circuit and structure problem, is the quality problems of LED single tube own less than 10% only; So the selection of power management scheme is also very important for energy-conservation, this just requires in design of drive circuit, to select only AC-DC driver.Therefore reliably, control circuit is the prerequisite that the LED illumination popularizes cheaply.
Electrology characteristic by LED can be known; The mean forward current of LED is along with the increase of forward voltage presents significantly linear growth; The great changes of the LED tiny change of its forward voltage behind forward conduction will causing LED electric current; And electric current is very big to the influence of LED junction temperature, and excessive electric current is easy to cause LED pearl junction temperature to raise and damages.In addition, can know the increase along with forward current by the optical characteristics of LED, the LED luminous flux increases thereupon, i.e. brightness increases.Therefore in order to keep the constant of LED luminosity, will guarantee the stable of LED forward current.Therefore driving power reasonable in design just seems very important for the LED lighting.
LED needs many lamp pearl series connection in use or is together in parallel and could works; Though adopt the required voltage of many LED of parallel way driving lower; But because the forward voltage drop of every LED is different; Make that the brightness of every LED is different, only if adopt the mode of separate regulating to guarantee that every LED has identical brightness.So parallel way will guarantee the brightness uniformity, implements more complicated.And it is identical to adopt series system can guarantee to flow through the electric current of every LED, and brightness is consistent, is present common structural.When adopting the type of drive of tandem type,, circuit is opened circuit and cisco unity malfunction if one of them or several LED break down and open circuit.
The utility model content
To the problems referred to above, the utility model provides a kind of simple in structure, cost is lower, efficient is high LED constant-current drive circuit.
For achieving the above object, the utility model LED constant-current drive circuit comprises power circuit; Constant-current circuit and LED load circuit that said power circuit is electrically connected; Said LED is connected in series, each LED two ends reverse parallel connection voltage-stabiliser tube, and said constant-current circuit is linear constant-current source.
Especially, said constant-current circuit comprises two sub-circuit, and said electronic circuit is by transistor, and voltage-stabiliser tube and resistance constitute.
Further, the voltage stabilizing value of said voltage-stabiliser tube is higher than the conducting voltage of said LED.
The utility model LED constant-current driving is that LED provides stable electric current through the linear constant-current source of complementation, through shunt regulator tube on each LED, has guaranteed that circuit can operate as normal when having LED to open circuit.
The utility model LED constant-current driving is a kind of simple in structure, cost is lower, efficient is high LED constant-current drive circuit; Linear constant-current source through complementation is that LED provides stable electric current; Through shunt regulator tube on each LED, guaranteed that circuit can operate as normal when having LED to open circuit.
Description of drawings
Fig. 1 is LED and the syndeton sketch map of voltage-stabiliser tube of the embodiment of the utility model LED constant-current drive circuit;
Fig. 2 is the structural representation of the embodiment of the utility model LED constant-current drive circuit.
Embodiment
Below in conjunction with Figure of description the utility model is done further description.
Shown in Fig. 1-2, the utility model LED constant-current drive circuit comprises power circuit 1; Constant-current circuit 3 and LED load circuit 2 that said power circuit is electrically connected; Wherein said LED is connected in series, each LED21 two ends reverse parallel connection voltage-stabiliser tube 22, and said constant-current circuit is linear constant-current source.
Especially, said constant-current circuit comprises two sub-circuit, and said electronic circuit is by transistor VQ1, VQ2; Voltage-stabiliser tube Vz1, Vz2 and resistance R 1, R2 constitute linear constant-current source; Transistor VQ1 wherein, voltage-stabiliser tube Vz1 and R1 constitute a constant-current source, and this constant-current source provides stable operating current for voltage-stabiliser tube Vz2; And transistor VQ2, voltage-stabiliser tube Vz2 and R2 constitute another constant-current source and give the stable operating current of voltage-stabiliser tube Vz1 altogether.Because two constant-current sources are stablized the other side's voltage-stabiliser tube working point mutually; The all no longer variations of total current that make burning voltage Vz1 and Vz2 and flow through this constant current unit; Therefore can guarantee to flow through operating current constant of LED; The electric current that it has guaranteed to flow through every white light LEDs is identical, obtains uniform brightness.Power circuit 1 adopts the direct rectifying and wave-filtering of civil power, and the direct-current working volts of controlled LED need not to boost or step-down is handled, so power driving circuit is succinct, and power-efficient is high.
Further, the voltage stabilizing value of said voltage-stabiliser tube is higher than the conducting voltage of said LED, avoids the voltage-stabiliser tube of parallel connection to divide pouring off one part of current and makes LED with deepening even do not work.
More than; Be merely the preferred embodiment of the utility model; But the protection range of the utility model is not limited thereto; Any technical staff who is familiar with the present technique field is in the technical scope that the utility model discloses, and the variation that can expect easily or replacement all should be encompassed within the protection range of the utility model.Therefore, the protection range of the utility model should be as the criterion with the protection range that claim was defined.
Claims (3)
1. a LED constant-current drive circuit comprises power circuit, constant-current circuit and LED load circuit that said power circuit is electrically connected, and it is characterized in that: said LED is connected in series, each LED two ends reverse parallel connection voltage-stabiliser tube, said constant-current circuit is linear constant-current source.
2. LED constant-current drive circuit according to claim 1 is characterized in that: said constant-current circuit comprises two sub-circuit, and said electronic circuit is by transistor, and voltage-stabiliser tube and resistance constitute.
3. LED constant-current drive circuit according to claim 1 is characterized in that: the voltage stabilizing value of said voltage-stabiliser tube is higher than the conducting voltage of said LED.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220192184 CN202634782U (en) | 2012-04-28 | 2012-04-28 | LED constant-current drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220192184 CN202634782U (en) | 2012-04-28 | 2012-04-28 | LED constant-current drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202634782U true CN202634782U (en) | 2012-12-26 |
Family
ID=47387915
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220192184 Expired - Fee Related CN202634782U (en) | 2012-04-28 | 2012-04-28 | LED constant-current drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202634782U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105472818A (en) * | 2016-01-13 | 2016-04-06 | 黎时勇 | LED lighting circuit |
-
2012
- 2012-04-28 CN CN 201220192184 patent/CN202634782U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105472818A (en) * | 2016-01-13 | 2016-04-06 | 黎时勇 | LED lighting circuit |
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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: 20121226 Termination date: 20130428 |