CN209824070U - LED constant current drive circuit - Google Patents
LED constant current drive circuit Download PDFInfo
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- CN209824070U CN209824070U CN201821656612.6U CN201821656612U CN209824070U CN 209824070 U CN209824070 U CN 209824070U CN 201821656612 U CN201821656612 U CN 201821656612U CN 209824070 U CN209824070 U CN 209824070U
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Abstract
The utility model provides a LED constant current drive circuit, it includes AC \ DC input module, rectification filter module, control module, output filter module, AC \ DC input module contain two input ends, the first input end is by two diode forward, reverse parallel connection, the second input end by two diode forward, reverse parallel connection after ground connection; the rectifier filter module comprises two capacitors and an inductor which form a PI type filter circuit; the control module adopts a constant current driving chip; the output filter circuit is an LC filter circuit consisting of an inductor and a capacitor and used for output filtering. Compared with the prior art, the utility model discloses LED constant current drive circuit of synchronous rectification, it is extremely simple peripheral, saved space and cost greatly, whole temperature is still lower, easily satisfies small-size LED car light driven demand, convenient equipment and installation.
Description
Technical Field
The utility model relates to a LED lamp technical field especially relates to a LED constant current drive circuit.
Background
The traditional vehicles generally adopt halogen lamps, and with the development of LED technology, more and more automobiles, motorcycles and electric vehicles apply LED headlights. However, the existing LED car lamp driving schemes are asynchronous schemes, and have the characteristics of complex periphery, low conversion efficiency and high temperature; meanwhile, the problems of complex periphery, high cost, large volume and the like of the conventional LED vehicle lamp driving over-authentication scheme are solved. In order to solve the technical problem, the utility model provides an effectual LED constant current drive circuit.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention provides an LED constant current driving circuit, which comprises an AC/DC input module, a rectifying and filtering module, a control module, and an output filtering module,
the AC \ DC input module comprises two input ends, wherein the first input end is formed by connecting two diodes in parallel in a forward direction and a reverse direction, and the second input end is formed by connecting two diodes in parallel in the forward direction and the reverse direction and then grounding;
the rectifier filter module comprises two capacitors and an inductor which form a PI type filter circuit;
the control module adopts a constant current driving chip;
the output filter circuit is an LC filter circuit consisting of an inductor and a capacitor and used for output filtering.
The technical scheme of the utility model is realized like this:
on the basis of the technical scheme, preferably, the inductor of the rectification filter module is of a patch magnetic bead type.
On the basis of the technical scheme, preferably, the output end of the constant current driving chip is connected in series with a loop consisting of a resistor and a capacitor and used for reducing noise.
On the basis of the above technical solution, preferably, the rectification filter module and the control module are further connected in series with a loop composed of a resistor and a capacitor, and used for power supply and noise reduction of the constant current driving chip.
The utility model discloses a have following beneficial effect for prior art:
(1) the single IC realizes synchronous rectification, and compared with the mainstream asynchronous scheme in the market at present, the single IC has the advantages of smaller volume, simpler periphery, higher conversion efficiency and lower temperature rise.
(2) The non-polar input is supported, EMC test can be easily passed only by extremely simplifying the periphery, and the overall cost is lower.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a circuit diagram of the present invention;
fig. 2 is a functional block diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work all belong to the protection scope of the present invention.
As shown in fig. 1 and 2, the present invention includes an LED constant current driving circuit, which includes an AC \ DC input module, a rectifying and filtering module, a control module, and an output filtering module,
the AC \ DC input module comprises two input ends VIN and COM, wherein the first input end VIN is composed of
The forward direction and the D2 of the two diodes D1 are connected in parallel in an inverted mode, and the second input end COM is grounded after being connected in parallel by the forward direction D1 and the reverse direction D2 of the two diodes; the diodes D1, D2, D3 and D4 form full-wave rectification, so that the input can be direct current or alternating current without distinguishing polarities; after external direct current or alternating current passes through the AC/DC input module, certain voltage direct current is obtained, such as: the direct current of 5V-12V flows through the rectifying and filtering module, wherein the two capacitors E1 and E2 and an inductor L2 of the rectifying and filtering module form a PI type filter circuit, and the PI type filter circuit is mainly used for reducing the interference of a driving power supply through EMC test. Different from the current mainstream differential mode inductor, the inductor L2 only needs 0805 packaged-sized patch magnetic beads;
after rectification and filtering, one path of current flows through the VIN end of the constant current driving chip U1, and the other path of current is connected with a serial loop of a resistor R1 and a capacitor C1 to the BS end of the constant current driving chip U1 and is used for built-in high-side MOS bootstrap power supply of the constant current driving chip U1;
the constant current driving chip U1 is driven by an output end pin SW, and a drain end pin SW of the low-side MOS is connected with a main power inductor L1 of the output filter circuit, L1 is an energy storage inductor, and the energy storage inductor is filtered by an output capacitor E3 and then connected to the anode of the LED load; and the cathode of the LED load and the cathode of the output filter capacitor E3 are connected to a current detection pin IFB of the LED constant-current and constant-current driving chip U1. The resistor R3 is in bridge connection with the cathode of the LED load and the ground end GND of the LED constant-current driving chip U1, so that the output current is accurately sampled, and constant-current output is realized.
As an improvement of this embodiment, a series circuit formed by the resistor R2 and the capacitor C2 has one end connected to the SW end of the LED constant-current driving chip U1, and the other end connected to GND, and is used to absorb high-frequency switching noise and interference of the SW.
The utility model discloses LED constant current drive circuit of synchronous rectification, the minimalist is peripheral, has saved space and cost greatly, and whole temperature is still lower, easily satisfies small-size LED car light driven demand, convenient equipment and installation.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. The utility model provides a LED constant current drive circuit, its includes, AC \ DC input module, rectification filter module, control module, output filter module, its characterized in that:
the AC \ DC input module comprises two input ends, wherein the first input end is formed by connecting two diodes in parallel in a forward direction and a reverse direction, and the second input end is formed by connecting two diodes in parallel in the forward direction and the reverse direction and then grounding;
the rectifier filter module comprises two capacitors and an inductor which form a PI type filter circuit;
the control module adopts a constant current driving chip;
the output filter circuit is an LC filter circuit consisting of an inductor and a capacitor and used for output filtering.
2. The LED constant current drive circuit according to claim 1, wherein: and the rectifier filter module inductor is of a patch magnetic bead type.
3. The LED constant current drive circuit according to claim 1, wherein: the output end of the constant current driving chip is connected in series with a loop consisting of a resistor and a capacitor and used for reducing noise.
4. The LED constant current drive circuit according to claim 1, wherein: the rectification filter module and the control module are also connected in series with a loop consisting of a resistor and a capacitor and used for power supply and noise reduction of the constant current driving chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821656612.6U CN209824070U (en) | 2018-10-12 | 2018-10-12 | LED constant current drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821656612.6U CN209824070U (en) | 2018-10-12 | 2018-10-12 | LED constant current drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209824070U true CN209824070U (en) | 2019-12-20 |
Family
ID=68868092
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821656612.6U Active CN209824070U (en) | 2018-10-12 | 2018-10-12 | LED constant current drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209824070U (en) |
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2018
- 2018-10-12 CN CN201821656612.6U patent/CN209824070U/en active Active
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