CN204497980U - A kind of DC-DC power source for full-color LED lamp - Google Patents
A kind of DC-DC power source for full-color LED lamp Download PDFInfo
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- CN204497980U CN204497980U CN201520205644.4U CN201520205644U CN204497980U CN 204497980 U CN204497980 U CN 204497980U CN 201520205644 U CN201520205644 U CN 201520205644U CN 204497980 U CN204497980 U CN 204497980U
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Abstract
The utility model discloses a kind of DC-DC power source for full-color LED lamp, described full-color LED lamp comprises red, green, blue three kinds of LED, and described DC-DC power source comprises ICLC, decoupling circuit, synchronous rectification step-down controller NB638DL chip, chip periphery input circuit, chip periphery output circuit, output filter circuit and protective circuit; The input of described ICLC connects external dc power; The input of described decoupling circuit connects the output of described ICLC, and output connects the input of described chip periphery input circuit; The output of described NB638DL chip connects the input of described chip periphery output circuit, and the output of described chip periphery output circuit connects the input of described output filter circuit; Described output filter circuit is used for carrying out filtering process, and described protective circuit is used for protecting the device in power supply.DC-DC power source of the present utility model, farthest can reduce electric energy loss, saves energy, raise the efficiency.
Description
[technical field]
The utility model relates to LED, particularly relates to a kind of DC-DC power source for full-color LED lamp.
[background technology]
LED display cell board generally comprises multiple red LED lamp, green LED lamp and blue led lamp.At present, the power supply of most of LED display cell board is that external power source is directly converted to 5V voltage, adopts the voltage of 5V unified for red, green, blue LED powers, or external power source is converted to low-voltage 3.8V, adopt low-voltage 3.8V directly to power.Use above-mentioned Power supply power supply, power all can be caused excessive, and waste of energy is more, does not require power supply, the problem that conversion efficiency is not high according to the actual required voltage of device.
[utility model content]
Technical problem to be solved in the utility model is: make up above-mentioned the deficiencies in the prior art, proposes a kind of DC-DC power source for full-color LED lamp, farthest can reduce electric energy loss, saves energy, raise the efficiency.
Technical problem of the present utility model is solved by following technical scheme:
A kind of DC-DC power source for full-color LED lamp, described full-color LED lamp comprises red, green, blue three kinds of LED, and described DC-DC power source comprises ICLC, decoupling circuit, synchronous rectification step-down controller NB638DL chip, chip periphery input circuit, chip periphery output circuit, output filter circuit and protective circuit; The input of described ICLC connects external dc power, for limiting inrush current; The input of described decoupling circuit connects the output of described ICLC, output connects the input of described chip periphery input circuit, after carrying out filter shape to the voltage of input, export to described NB638DL chip by described chip periphery input circuit; The output of described NB638DL chip connects the input of described chip periphery output circuit, the output of described chip periphery output circuit connects the input of described output filter circuit, described NB638DL chip and described chip periphery output circuit are used for carrying out rectification step-down process to the voltage inputted in chip, are converted to red LED lamp, blue led lamp or the operating voltage needed for green LED lamp; The voltage that described output filter circuit is used for described chip periphery output circuit exports carries out filtering process, and described protective circuit is used for protecting the device in described DC-DC power source.
The beneficial effect that the utility model is compared with the prior art is:
DC-DC power source for full-color LED lamp of the present utility model, ICLC is set, decoupling circuit, synchronous rectification step-down controller NB638DL chip and peripheral circuit thereof, output filter circuit and protective circuit, thus during work, power supply receives external dc power, utilize the synchronous rectification buck functionality of NB638DL chip, be red LED lamp by voltage transitions, blue led lamp or the operating voltage needed for green LED lamp, when can work according to the LED of three kinds of colors like this, the voltage of actual needs carrys out the number of the above-mentioned power supply of relative set, produce corresponding voltage, such as, blue, green LED adopts same road 3.8V/6.5A power voltage supply, red LED one tunnel adopts 2.8V/3.5A to power, thus the lamp of shades of colour is by operating voltage driving work, instead of as traditional 5V voltage exceeding operating voltage or the work of 3.8V voltage driven, farthest can reduce electric energy loss, saves energy, raise the efficiency.In power supply, ICLC, protective circuit etc. are set, whole power circuit can be protected can not to damage because of overcurrent, convenient and minimizing later maintenance cost.
[accompanying drawing explanation]
Fig. 1 is the circuit diagram of the DC-DC power source for full-color LED lamp of the utility model embodiment.
[embodiment]
Contrast accompanying drawing below in conjunction with embodiment the utility model is described in further details.
As shown in Figure 1, be the circuit diagram of the DC-DC power source for full-color LED lamp of this embodiment.DC-DC power source comprises two way power supplys, and a way power supply produces 3.8V/6.5A voltage for changing, thus simultaneously for blue, green LED are powered; One way power supply produces 2.8V/3.5A voltage for changing, and powers separately for red LED.The structure of two way power supplys is identical, and each way power supply includes ICLC, decoupling circuit, synchronous rectification step-down controller NB638DL chip, chip periphery input circuit, chip periphery output circuit, output filter circuit and protective circuit.Two way power sharing ICLC in this embodiment, be described in detail for a wherein road as follows, the structure on another road is identical, only the mark multiple labeling one " A " of each device.
Wherein, the external dc voltage of prime is input to ICLC by input port VIN.Adopt DC24V as external dc voltage in this embodiment, for whole power circuit is powered, input from VIN input port.
ICLC comprises resistor F1, and resistor F1 can limit inrush current, and doubles as protection fuse, protects circuit admirably.
Decoupling circuit comprises the first electric capacity (C1) and the second electric capacity (C2) that are connected in parallel, forms decoupling circuit, effectively processing apparatus self or exogenous noise by the first electric capacity C1, the second electric capacity C2A.
High-frequency, synchronous rectification Buck switched-mode transducer NB638DL chip U1; be characterized in 4.5V to 28V Width funtion input service scope; the output current of 7A, exporting adjustable voltage scope is 0.8V to 13V, provides complete defencive function to comprise SCP, OCP, OVP, UVP and Thermal shutdown.
The peripheral input circuit of chip comprises the 5th electric capacity C5, the 6th electric capacity C6, the 7th electric capacity C7, the 6th resistance R6, the 5th resistance R5 and the 7th resistance R7.The voltage exported after decoupling circuit filter shape directly connects the IN pin (input) of U1,5th resistance R5 and the 7th resistance R7 forms bleeder circuit, the first end of the 5th resistance R5 connects the EN pin of described NB638DL chip, the first end ground connection of the 7th resistance R7, second end of the 5th resistance R5 is connected with second end of the 7th resistance R7, be connected end as the voltage after the voltage input end connection shaping of described bleeder circuit, thus stablize the EN pin voltage of NB638DL chip U1, for the Enable Pin of NB638DL chip U1 provides threshold voltage.7th electric capacity C7 is connected directly between the FREQ pin of U1 and ground, is shunt capacitance.5th electric capacity C5 is connected between the VCC pin (built-in bias plasma source) of U1 and ground simultaneously, is also shunt capacitance.6th resistance R6 is connected between the PGOOD pin (the good output of power supply) of U1 and VCC pin.PGOOD pin is the open drain of a power MOSFET.When connecting the built-in grid bias power supply VCC pin of U1 by the 6th resistance R6, after input voltage VIN exceeds load, MOSFET corresponding to PGOOD pin by conducting, thus is convenient to PGOOD pin ground connection before SS pin is ready to.So the 6th resistance R6 plays is the effect of pull-up resistor, to VCC dividing potential drop, also can regards as and shield.The SS pin of U1 (soft start/stopping end) by the direct ground connection of the 6th electric capacity C6, the 6th electric capacity C6 as decoupling capacitor, can when power supply starts suddenly/closes steady output voltage, prevent voltage jump, reduce ripple and produce.The AGND pin of U1 and RGND pin ground connection simultaneously, guarantees that chip performance is stablized.
The peripheral output circuit of chip comprises the 3rd resistance R3, the 3rd electric capacity C3, feedback circuit and accumulator.The BST pin of described NB638DL chip is connected with the SW pin of described NB638DL chip by after the 3rd resistance R3 that is connected in series and the 3rd electric capacity C3, the end that is connected connects the input of described accumulator, and the output of accumulator is as the output of described chip periphery output circuit; The power input of described feedback circuit is connected with the SW pin of described NB638DL chip, and the FB pin of described NB638DL chip is connected with the output of described accumulator by described feedback circuit.Wherein, accumulator comprises the first inductance L 1.Feedback circuit comprises the first resistance R1, the second resistance R2, the 4th resistance R4, the 9th resistance R9 and the 4th electric capacity C4.
The series connection of BST pin the 3rd resistance R3, the 3rd electric capacity C3 of U1, the other end that the 3rd resistance R3, the 3rd electric capacity C3 connect connects the SW pin of U1.BST pin is bootstrapping pin, the i.e. normal output of control SW pin automatically.The square-wave voltage that SW pin exports sends the 3rd electric capacity C3 to, filtering high-frequency energy, reduces voltage by the 3rd resistance R3, form a less floating voltage and input to BST pin, BST pin is connected with the efficient switch circuit of chip U1 inside, and control switch closes, and then the output frequency of control SW pin.
The SW pin of U1 connects the first end of the first inductance L 1, and the second end of the first inductance L 1 is as the output of chip periphery output circuit.The major function of the first inductance L 1 is energy storage.The high-speed switching circuit of chip U1 inside is closed by opening, and forms a square wave and exports.First inductance L 1 starts energy storage when square wave rising edge, electric discharge is started when square wave trailing edge, for rear class output voltage, the voltage exported is on the one hand as in feedback signal input feedback circuit, be on the other hand that the 8th electric capacity C8, the 9th electric capacity C9 and the tenth electric capacity C10 of rear end charges, the charging and discharging process of three electric capacity all can regard the filtering to ripple as, makes output voltage more steady.
The first end of the 4th resistance R4 is as the power input of feedback circuit, connect the SW pin of described NB638DL chip, second end is connected with the first end of the 4th electric capacity C4, the end that is connected connects the first end of described 9th resistance R9, second end of the 9th resistance R9 connects the FB pin of NB638DL chip, second end of the 4th electric capacity C4 connects the output of accumulator, is also the second end of the first inductance L 1.These three elements form a compensating circuit, are connected between the FB pin of U1 and SW pin.When successive load is very large, first inductance L 1, the 8th electric capacity C8, the 9th electric capacity C9 and the electric energy stored by the tenth electric capacity C10 are not enough, cause having ripple to export, now, in this compensating circuit, 4th resistance R4 and the 4th electric capacity C4 can utilize the ripple fed back to fill energy, and after the 9th resistance R9 step-down, input FB feed back pin, the comparator of chip internal will carry out regulated output voltage according to reference voltage.And this reference voltage is the bleeder circuit be made up of the first resistance R1 and the second resistance R2 is formed.First resistance R1 first end connects the output (being also the second end of the first inductance L 1) of accumulator, and the second end is connected with the first end of the second resistance R2, the second end ground connection of the second resistance R2.Bleeder circuit utilizes from the output of accumulator, and the voltage that also namely one end of the first inductance L 1 feeds back to carries out dividing potential drop, and form partial pressure value at the series connection end that is connected, input FB feeds back pin, thus provides reference voltage for the comparator of chip internal.Therefore, different resistances is set by the first resistance R1 in feedback circuit and the second resistance R2, thus obtains required partial pressure value, and then stablize the voltage of chip periphery output circuit output output accordingly, the magnitude of voltage needed for output.
Output filter circuit comprises the 8th electric capacity C8, the 9th electric capacity C9 and the tenth electric capacity C10 that are connected in parallel.Protective circuit comprises transient voltage protection diode TVS.8th electric capacity C8, the 9th electric capacity C9, the tenth electric capacity C10 and transient voltage protect diode TVS to be together in parallel; in two ends simultaneously in parallel; second end of one termination first inductance L 1; other end ground connection; and the anode of transient voltage protection diode TVS connects the low-voltage end in parallel connected end, i.e. ground connection.Output filter circuit can smooth direct current ripple, eliminate high-frequency noise, make output voltage more stable, clean.Transient voltage protection diode TVS is efficient protection device; when the two poles of the earth of diode TVS are subject to opposite direction transient state high energy impact events; with the speed of 10-12 second-time, the high impedance of its two interpolar can be become Low ESR; absorb the power of surging up to thousands of watts; make the voltage clamping of two interpolars in a predetermined value, effectively protect the precision components in electronic circuit.The voltage that chip periphery output circuit exports exports LED to after output filter circuit filtering process, thus provides the operating voltage of needs for the LED of respective color.
The operation principle of the sub-power supply of foregoing circuit composition is summarized as follows:
DC24V voltage is from power input port VIN input, and through resistor F1, resistor F1 can limit inrush current, and doubles as protection fuse, protects circuit admirably.Then by the decoupling circuit that the first electric capacity C1, the second electric capacity C2 are formed, processing apparatus self or exogenous noise effectively.Required magnitude of voltage is gone out again by high-frequency synchronous rectification Buck switched-mode transducer NB638DL chip and required standard peripheral element design; the last filter circuit be made up of the 8th electric capacity C8, the 9th electric capacity C9, the tenth electric capacity C10; can smooth direct current ripple function, eliminate high-frequency noise; make output voltage more stable, clean; output port adds an efficient protection device TVS2, effectively protects precision components in electronic circuit.Achieve power supply to when comprising the LED display module for power supply of three kinds of color LED, meet the real work needs of each color LED, thus reduce the useless power consumption of some LED that same power voltage supply brings, thus decrease circuit loss, saves energy, improves conversion efficiency.By the adjustment of feedback resistance R1 and R2 in circuit, also output voltage can be realized adjustable, also for the LED display of high-quality is given security.High-frequency synchronous rectification Buck switched-mode transducer NB638DL chip is adopted, peripheral cell negligible amounts required during its work in power supply, greatly cost-saving.Adopt NB638DL chip; can not only high efficiency work; the input of DC4.5V to DC28V Width funtion can also be realized; there is wide output voltage loading range (voltage exports adjustable extent 0.8V to 13V); and provide complete defencive function to comprise SCP; OCP, OVP, UVP and Thermal shutdown.
In addition, in power supply by following 3 kinds of modes: (1) uses the impedance of transformer itself to limit (NB638DL); (2) overcurrent protective device is used to limit (adopting resistor F1); (3) use electronic circuit protected mode to limit (efficient protection device TVS2), reach the requirement of CLASS2 circuit, therefore there is safe and reliable advantage.
Above content is in conjunction with concrete preferred implementation further detailed description of the utility model, can not assert that concrete enforcement of the present utility model is confined to these explanations.For the utility model person of an ordinary skill in the technical field, make some substituting or obvious modification without departing from the concept of the premise utility, and performance or purposes identical, all should be considered as belonging to protection range of the present utility model.
Claims (10)
1. the DC-DC power source for full-color LED lamp, described full-color LED lamp comprises red, green, blue three kinds of LED, it is characterized in that: described DC-DC power source comprises ICLC, decoupling circuit, synchronous rectification step-down controller NB638DL chip, chip periphery input circuit, chip periphery output circuit, output filter circuit and protective circuit;
The input of described ICLC connects external dc power, for limiting inrush current;
The input of described decoupling circuit connects the output of described ICLC, output connects the input of described chip periphery input circuit, after carrying out filter shape to the voltage of input, export to described NB638DL chip by described chip periphery input circuit;
The output of described NB638DL chip connects the input of described chip periphery output circuit, the output of described chip periphery output circuit connects the input of described output filter circuit, described NB638DL chip and described chip periphery output circuit are used for carrying out rectification step-down process to the voltage inputted in chip, are converted to red LED lamp, blue led lamp or the operating voltage needed for green LED lamp;
The voltage that described output filter circuit is used for described chip periphery output circuit exports carries out filtering process, and described protective circuit is used for protecting the device in described DC-DC power source.
2. the DC-DC power source for full-color LED lamp according to claim 1, is characterized in that: described ICLC comprises resistor (F1).
3. the DC-DC power source for full-color LED lamp according to claim 1, is characterized in that: described decoupling circuit comprises the first electric capacity (C1) and the second electric capacity (C2) that are connected in parallel.
4. the DC-DC power source for full-color LED lamp according to claim 1, it is characterized in that: described chip periphery input circuit comprises the 5th electric capacity (C5), 6th electric capacity (C6), 7th electric capacity (C7), 6th resistance (R6) and bleeder circuit, the IN pin of described NB638DL chip connects the output of described decoupling circuit, the FREQ pin of described NB638DL chip is by described 7th electric capacity (C7) ground connection, the VCC pin of described NB638DL chip is by described 5th electric capacity (C5) ground connection, the PGOOD pin of described NB638DL chip is by described 6th resistance (R6) and described 5th electric capacity (C5) ground connection afterwards, the voltage input end of described bleeder circuit connects the output of described decoupling circuit, the EN pin of described NB638DL chip is by ground connection after described bleeder circuit, the SS pin of described NB638DL chip is by described 6th electric capacity (C6) ground connection afterwards, the AGND pin of described NB638DL chip and PGND pin ground connection.
5. the DC-DC power source for full-color LED lamp according to claim 4, it is characterized in that: described bleeder circuit comprises the 5th resistance (R5) and the 7th resistance (R7), the first end of described 5th resistance (R5) connects the EN pin of described NB638DL chip, the first end ground connection of described 7th resistance (R7), second end of described 5th resistance (R5) is connected with the second end of described 7th resistance (R7), and be connected the voltage input end of end as described bleeder circuit.
6. the DC-DC power source for full-color LED lamp according to claim 1, it is characterized in that: described chip periphery output circuit comprises the 3rd resistance (R3), the 3rd electric capacity (C3), feedback circuit and accumulator, the BST pin of described NB638DL chip is connected with the SW pin of described NB638DL chip by after the 3rd resistance (R3) that is connected in series and the 3rd electric capacity (C3), the end that is connected connects the input of described accumulator, and the output of accumulator is as the output of described chip periphery output circuit; The power input of described feedback circuit is connected with the SW pin of described NB638DL chip, and the FB pin of described NB638DL chip is connected with the output of described accumulator by described feedback circuit.
7. the DC-DC power source for full-color LED lamp according to claim 6, is characterized in that: described feedback circuit comprises the first resistance (R1), the second resistance (R2), the 4th resistance (R4), the 9th resistance (R9) and the 4th electric capacity (C4); Described first resistance (R1) first end connects the output of described accumulator, and the second end is connected with the first end of described second resistance (R2), the second end ground connection of described second resistance (R2); The first end of described 4th resistance (R4) is as the power input of described feedback circuit, connect the SW pin of described NB638DL chip, second end is connected with the first end of the 4th electric capacity (C4), the end that is connected connects the first end of described 9th resistance (R9), second end of the 9th resistance (R9) connects the FB pin of described NB638DL chip, and the second end of the 4th electric capacity (C4) connects the output of described accumulator.
8. the DC-DC power source for full-color LED lamp according to claim 6, is characterized in that: described accumulator comprises the first inductance (L1).
9. the DC-DC power source for full-color LED lamp according to claim 1, is characterized in that: described output filter circuit comprises the 8th electric capacity (C8), the 9th electric capacity (C9) and the tenth electric capacity (C10) that are connected in parallel.
10. the DC-DC power source for full-color LED lamp according to claim 1; it is characterized in that: described protective circuit comprises transient voltage protection diode (TVS), described transient voltage protection diode (TVS) is connected in parallel between two outputs of described output filter circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520205644.4U CN204497980U (en) | 2015-04-07 | 2015-04-07 | A kind of DC-DC power source for full-color LED lamp |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520205644.4U CN204497980U (en) | 2015-04-07 | 2015-04-07 | A kind of DC-DC power source for full-color LED lamp |
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| CN201520205644.4U Expired - Fee Related CN204497980U (en) | 2015-04-07 | 2015-04-07 | A kind of DC-DC power source for full-color LED lamp |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109194143A (en) * | 2018-11-13 | 2019-01-11 | 江苏兆能电子有限公司 | A kind of isolation detection route of digital switch power supply medium-long range switching signal |
| CN109768704A (en) * | 2019-01-31 | 2019-05-17 | 郑州云海信息技术有限公司 | A kind of generative circuit of the normal indication signal of the output of chopper and its chopper circuit |
-
2015
- 2015-04-07 CN CN201520205644.4U patent/CN204497980U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109194143A (en) * | 2018-11-13 | 2019-01-11 | 江苏兆能电子有限公司 | A kind of isolation detection route of digital switch power supply medium-long range switching signal |
| CN109768704A (en) * | 2019-01-31 | 2019-05-17 | 郑州云海信息技术有限公司 | A kind of generative circuit of the normal indication signal of the output of chopper and its chopper circuit |
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| C14 | Grant of patent or utility model | ||
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Address after: 518103 Guangdong, Shenzhen City, Guangdong Province, Baoan District Fuyong street oyyip road Xu Yuchang Industrial Park, B2 Patentee after: SHENZHEN LIGHTKING OPTOELECTRONICS TECH Group Address before: 518103 Shenzhen, Guangdong, Fuyong street and the Far East Industrial Zone, the new building of the third Baoan District Patentee before: SHENZHEN LIGHTKING OPTOELECTRONICS TECH Group |
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Granted publication date: 20150722 |