CN202663613U - Driving circuit for LED (light-emitting diode) MR16 reflector lamp - Google Patents
Driving circuit for LED (light-emitting diode) MR16 reflector lamp Download PDFInfo
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- CN202663613U CN202663613U CN2012202893229U CN201220289322U CN202663613U CN 202663613 U CN202663613 U CN 202663613U CN 2012202893229 U CN2012202893229 U CN 2012202893229U CN 201220289322 U CN201220289322 U CN 201220289322U CN 202663613 U CN202663613 U CN 202663613U
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Abstract
The utility model discloses a driving circuit for an LED (light-emitting diode) MR16 reflector lamp. The driving circuit for an LED MR16 reflector lamp comprises a rectification filter circuit, a boosting voltage stabilizing circuit and a voltage reduction constant-current circuit which are connected sequentially, wherein the rectification filter circuit comprises a bridge rectifier consisting of four diodes D1-D4; the boosting voltage stabilizing circuit comprises a main chip U1, an inductor L2, a magnetic bead FB1, a diode D6, resistors R1 and R6 which are connected together; and the voltage reduction constant-current circuit 13 comprises a main chip U2, a diode D5, an inductor L1 and a resistor R3 which are connected together. Because the driving circuit for an LED MR16 reflector lamp, provided by the utility model, is provided with the boosting voltage stabilizing circuit and the voltage reduction constant-current circuit so as to achieve the dual-stage treatment based on a BOOST stage and a BUCK state, voltage output by the circuit can be stabilized within a voltage range required by the MR16 reflector lamp, a lamp fitting is prevented from flickering, and the use performance and the service life of the lamp fitting are improved; in addition, the driving circuit also has the advantages of simple structure, low cost and the like.
Description
Technical field
The utility model relates to a kind of led drive circuit, relates more specifically to a kind of drive circuit for LED MR16 shot-light.
Background technology
At present, led light source just progressively replaces conventional light source as the green energy conservation light source at lighting field.Simultaneously, the MR16 shot-light of LED also progressively replaces traditional MR16 shot-light.And traditional MR16 shot-light adopts the prime electronic transformer to drive more.Yet existing LED MR16 shot-light adopts single-stage BOOST, BUCK drive circuit structure more, has the part output voltage to be difficult to reach the input voltage requirement of circuit when capable of being matched with electronic transformer, thereby causes light fixture to glimmer.
Therefore, be necessary to provide a kind of LED MR16 drive circuit that can address the aforementioned drawbacks.
The utility model content
The purpose of this utility model provides a kind of drive circuit for LED MR16 shot-light to avoid the light fixture flicker, improves light fixture serviceability and useful life.
To achieve these goals, the technical solution adopted in the utility model is: a kind of drive circuit for the LEDMR16 shot-light is provided, and it comprises current rectifying and wave filtering circuit, voltage boosting and stabilizing circuit and the step-down constant-current circuit that links to each other successively.Wherein, described current rectifying and wave filtering circuit comprises the bridge heap that is comprised of four diode D1 ~ D4, and the connected node of diode D1 and D3 connects the positive pole of input power, and the connected node of diode D2 and D4 connects the negative pole of input power; Described voltage boosting and stabilizing circuit comprises master chip U1, inductance L 2, magnetic bead FB1, diode D6, resistance R 1 and R6, described master chip U1 has pin VIN, pin GND, pin SW, pin FB and pin EN, described inductance L 2 is connected between the pin SW and pin VIN of master chip U1, described magnetic bead FB1 is connected to pin SW, described sustained diode 6 one ends link to each other with magnetic bead FB1, the other end links to each other with resistance R 6, be connected in parallel on the output of voltage boosting and stabilizing circuit after described resistance R 1 and R6 connect mutually, the connected node of resistance R 1 and R6 is connected to pin FB; Described step-down constant-current circuit 13 comprises master chip U2, diode D5, inductance L 1 and resistance R 3, described master chip U2 has input pin VIN, pin GND, pin ADJ, pin LX and pin ISENSE, described resistance R 3 is connected between the pin VIN and pin ISENSE of master chip U2, and diode D5 is connected between the pin VIN of master chip U2 and the pin LX and inductance L 1 is connected to pin LX.
Its further technical scheme is: described current rectifying and wave filtering circuit also comprises an insurance resistance R X, and described insurance resistance R X one end links to each other with the positive pole of input power, and its other end is connected on the connected node of diode D1 and D3.
Its further technical scheme is: described current rectifying and wave filtering circuit also comprises an electrochemical capacitor C1, and described electrochemical capacitor C1 one end is connected on the connected node of electric capacity D3 and D4, its other end ground connection.
Its further technical scheme is: described voltage boosting and stabilizing circuit also comprises the filter circuit that is composed in series by resistance R 2 and capacitor C 9.
Its further technical scheme is: described voltage boosting and stabilizing circuit also comprises a patch capacitor C2, and described patch capacitor C2 is connected between the pin VIN and pin GND of described master chip U1.
Its further technical scheme is: the output of described voltage boosting and stabilizing circuit is parallel with a filter capacitor C4.
Its further technical scheme is: described step-down constant-current circuit also comprises a patch capacitor C10, and described patch capacitor C10 is connected between the pin VIN and pin GND of described master chip U2.
Its further technical scheme is: the output of described step-down constant-current circuit is parallel with a filter capacitor C3.
Compared with prior art, the drive circuit that is used for LED MR16 shot-light that the utility model provides is owing to be provided with voltage boosting and stabilizing circuit and the step-down constant-current circuit realizes that the twin-stage of BOOST level and BUCK level processes, circuit output voltage can be stabilized in the required circuit voltage scope of MR16 shot-light, avoid the light fixture flicker, improve light fixture serviceability and useful life.In addition, this drive circuit also has simple in structure, and cost hangs down inferior advantage.
By following description also by reference to the accompanying drawings, it is more clear that the utility model will become, and these accompanying drawings are used for explaining embodiment of the present utility model.
Description of drawings
Fig. 1 is the circuit diagram that the utility model is used for drive circuit one embodiment of LED MR16 shot-light.
Each description of reference numerals is as follows among the figure:
The drive circuit 10 that is used for LED MR16 shot-light
Current rectifying and wave filtering circuit 11
Voltage boosting and stabilizing circuit 12
Step-down constant-current circuit 13
Embodiment
Below in conjunction with the accompanying drawing among the utility model embodiment, the technical scheme among the embodiment is clearly and completely described, similar assembly label represents similar assembly in the accompanying drawing.Obviously, below only be the utility model part embodiment with the embodiment that describes, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that obtains under the creative work prerequisite, all belong to the scope of the utility model protection.
With reference to Fig. 1, Fig. 1 is the circuit diagram that the utility model is used for drive circuit one embodiment of LED MR16 shot-light.In the present embodiment, described drive circuit 10 comprises current rectifying and wave filtering circuit 11, voltage boosting and stabilizing circuit 12 and 13 3 parts of step-down constant-current circuit that link to each other successively.
The current rectifying and wave filtering circuit 11 of present embodiment comprises four rectifier diode D1 ~ D4, insurance resistance R X and electrochemical capacitor C1.Wherein, four rectifier diode D1 ~ D4 form bridge and pile to realize rectification, and the positive pole of input power is connected on the connected node of D1 and D3, and the negative pole of input power is connected on the connected node of D2 and D4; Insurance resistance R X one end links to each other with the positive pole of input power, and the other end is connected on the connected node of diode D1 and D3, and the setting of insurance resistance R X can prevent excessive the burning out of circuit power and affect incoming line; Described electrochemical capacitor C1 one end is connected on the connected node of electric capacity D3 and D4, other end ground connection, and it can provide filter action.
The voltage boosting and stabilizing circuit 12(BOOST level of present embodiment) comprises master chip U1, power inductance L2, magnetic bead FB1, sustained diode 6, sampling resistor R1, R6, patch capacitor C2 and electrochemical capacitor C4.Wherein, there is the benchmark output voltage of 1.25V the inside of master chip U1, and it is the pressure drop of LED series connection greater than the output of BUCK level that passing ratio divider resistance R1 and R6 raise output with the output voltage of BOOST level.Can guarantee like this normal operation of BUCK functional circuit.The pin 1 of master chip U1 is grounding pin GND; Pin 2 is level enable pin EN, and high level is effective, and this pin can unsettledly not use; Pin 3 is the switch pin SW of U1; Pin 4 is the input power pin VIN of U1; Pin 5 is feedback pin FB.Power inductance L2 is connected between pin SW and the pin VIN, magnetic bead FB1 is connected to pin SW, and sustained diode 6 one ends link to each other with magnetic bead FB1, the other end exports the step-down constant-current circuit to, when the switch conduction of U1 inside, voltage reversal when inductance L 2 stored energys, switch are turn-offed on the inductance L 1, the negative pole output voltage of sustained diode 6 be VIN follow VL's and.R2 and C9 are composed in series filter circuit with the high frequency ripple on the filtering U1 internal switch.The patch capacitor C2 of low capacity is connected to pin VIN and grounding pin GND with the filtering high frequency ripple.The electrochemical capacitor C4 that is connected in parallel in the circuit is filter capacitor.
The step-down constant-current circuit 13(BUCK level of present embodiment) comprises master chip U2, sustained diode 5, power inductance L1, sampling resistor R3, patch capacitor C10 and filter capacitor C3.Master chip U2 has input voltage pin VIN, grounding pin GND, pin ADJ, pin LX and pin ISENSE, wherein, meet sampling resistor R3 between pin VIN and the pin ISENSE, capacitance difference between the two pins is 0.1V, so output current is that the pressure drop of 0.1V is divided by the resistance of R3, thereby the comparator by the IC inside relatively switch of pressure reduction and the size control U2 inside of 0.1V of its two pins turn-offs and conducting the purpose of realization step-down constant current.Sustained diode 5 is connected between pin VIN and the pin LX and inductance L 1 is connected between pin LX and the output, when the switch in the U2 turn-offs, is that the energy with energy storage inductor L1 outputs on the load LED by the loop.C3 is output filter capacitor, and it is connected in parallel on output.And patch capacitor C10 is connected between pin VIN and the pin GND with the filtering high frequency ripple.
The common voltage of output that the input of the utility model drive circuit connects electronic transformer is that AC 5V is between the 18V, voltage is raised to the 24-30V interval through the rectifying and wave-filtering of this drive circuit and after boosting, the output voltage that guarantees U2 in the follow-up BUCK circuit is a stationary value and is higher than output voltage that the output voltage 9V-21V of step-down constant-current circuit 13 can make 3 to 7 string LED work.The BUCK circuit works always like this, the phenomenon that can not occur glimmering.
As mentioned above, the drive circuit that is used for LED MR16 shot-light that the utility model provides is owing to be provided with voltage boosting and stabilizing circuit and the step-down constant-current circuit realizes that the twin-stage of BOOST level and BUCK level processes, circuit output voltage can be stabilized in the required circuit voltage scope of MR16 shot-light, avoid the light fixture flicker, improve light fixture serviceability and useful life.In addition, this drive circuit also has simple in structure, and cost hangs down inferior advantage.
Abovely in conjunction with preferred embodiment the utility model is described, but the utility model is not limited to the embodiment of above announcement, and should contains various modification, equivalent combinations of carrying out according to essence of the present utility model.
Claims (8)
1. drive circuit that is used for LED MR16 shot-light is characterized in that: comprise the current rectifying and wave filtering circuit, voltage boosting and stabilizing circuit and the step-down constant-current circuit that link to each other successively,
Described current rectifying and wave filtering circuit comprises the bridge heap that is comprised of four diode D1 ~ D4, and the connected node of diode D1 and D3 connects the positive pole of input power, and the connected node of diode D2 and D4 connects the negative pole of input power;
Described voltage boosting and stabilizing circuit comprises master chip U1, inductance L 2, magnetic bead FB1, diode D6, resistance R 1 and R6, described master chip U1 has pin VIN, pin GND, pin SW, pin FB and pin EN, described inductance L 2 is connected between the pin SW and pin VIN of master chip U1, described magnetic bead FB1 is connected to pin SW, described sustained diode 6 one ends link to each other with magnetic bead FB1, the other end links to each other with resistance R 6, be connected in parallel on the output of voltage boosting and stabilizing circuit after described resistance R 1 and R6 connect mutually, the connected node of resistance R 1 and R6 is connected to pin FB;
Described step-down constant-current circuit 13 comprises master chip U2, diode D5, inductance L 1 and resistance R 3, described master chip U2 has input pin VIN, pin GND, pin ADJ, pin LX and pin ISENSE, described resistance R 3 is connected between the pin VIN and pin ISENSE of master chip U2, and diode D5 is connected between the pin VIN of master chip U2 and the pin LX and inductance L 1 is connected to pin LX.
2. the drive circuit for LED MR16 shot-light as claimed in claim 1, it is characterized in that: described current rectifying and wave filtering circuit also comprises an insurance resistance R X, described insurance resistance R X one end links to each other with the positive pole of input power, and its other end is connected on the connected node of diode D1 and D3.
3. the drive circuit for LED MR16 shot-light as claimed in claim 1, it is characterized in that: described current rectifying and wave filtering circuit also comprises an electrochemical capacitor C1, described electrochemical capacitor C1 one end is connected on the connected node of electric capacity D3 and D4, its other end ground connection.
4. the drive circuit for LED MR16 shot-light as claimed in claim 1, it is characterized in that: described voltage boosting and stabilizing circuit also comprises the filter circuit that is composed in series by resistance R 2 and capacitor C 9.
5. the drive circuit for LED MR16 shot-light as claimed in claim 1, it is characterized in that: described voltage boosting and stabilizing circuit also comprises a patch capacitor C2, described patch capacitor C2 is connected between the pin VIN and pin GND of described master chip U1.
6. the drive circuit for LED MR16 shot-light as claimed in claim 1, it is characterized in that: the output of described voltage boosting and stabilizing circuit is parallel with a filter capacitor C4.
7. the drive circuit for LED MR16 shot-light as claimed in claim 1, it is characterized in that: described step-down constant-current circuit also comprises a patch capacitor C10, described patch capacitor C10 is connected between the pin VIN and pin GND of described master chip U2.
8. the drive circuit for LED MR16 shot-light as claimed in claim 1, it is characterized in that: the output of described step-down constant-current circuit is parallel with a filter capacitor C3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012202893229U CN202663613U (en) | 2012-06-19 | 2012-06-19 | Driving circuit for LED (light-emitting diode) MR16 reflector lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012202893229U CN202663613U (en) | 2012-06-19 | 2012-06-19 | Driving circuit for LED (light-emitting diode) MR16 reflector lamp |
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| Publication Number | Publication Date |
|---|---|
| CN202663613U true CN202663613U (en) | 2013-01-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012202893229U Expired - Fee Related CN202663613U (en) | 2012-06-19 | 2012-06-19 | Driving circuit for LED (light-emitting diode) MR16 reflector lamp |
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| CN (1) | CN202663613U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015024224A1 (en) * | 2013-08-22 | 2015-02-26 | Liu Xiaofeng | Led constant-current circuit and led lamp |
| WO2015131389A1 (en) * | 2014-03-07 | 2015-09-11 | 深圳市众明半导体照明有限公司 | Mr16 type led spotlight and dimming power source thereof |
| CN108399898A (en) * | 2016-05-06 | 2018-08-14 | 青岛海信电器股份有限公司 | A kind of television set |
-
2012
- 2012-06-19 CN CN2012202893229U patent/CN202663613U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015024224A1 (en) * | 2013-08-22 | 2015-02-26 | Liu Xiaofeng | Led constant-current circuit and led lamp |
| CN104813745A (en) * | 2013-08-22 | 2015-07-29 | 刘晓峰 | LED constant-current circuit and LED lamp |
| CN104813745B (en) * | 2013-08-22 | 2016-07-06 | 刘晓峰 | Led constant current circuit and led lamp |
| WO2015131389A1 (en) * | 2014-03-07 | 2015-09-11 | 深圳市众明半导体照明有限公司 | Mr16 type led spotlight and dimming power source thereof |
| CN108399898A (en) * | 2016-05-06 | 2018-08-14 | 青岛海信电器股份有限公司 | A kind of television set |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130109 Termination date: 20150619 |
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| EXPY | Termination of patent right or utility model |