CN209930560U

CN209930560U - LED drive circuit and car light and car that have it

Info

Publication number: CN209930560U
Application number: CN201920129033.4U
Authority: CN
Inventors: 刘大震; 徐宝奇
Original assignee: Changzhou Xingyu Automotive Lighting Systems Co Ltd
Current assignee: Changzhou Xingyu Automotive Lighting Systems Co Ltd
Priority date: 2019-01-25
Filing date: 2019-01-25
Publication date: 2020-01-10
Anticipated expiration: 2029-01-25

Abstract

The utility model discloses a LED drive circuit and car light and car that have it, LED drive circuit includes: a DC-DC constant voltage power supply driving circuit capable of supplying a constant voltage to the LED driving circuit; the LED constant current driving circuit is used for boosting or reducing the voltage of an accessed power supply and then outputting the boosted or reduced voltage, and the LED constant current driving circuit is a triode constant current circuit or an IC constant current chip driving circuit; and the output stage circuit is used for outputting the voltage output by the LED constant current driving circuit to an LED. The LED driving circuit can effectively solve the problem of high cost caused by using a plurality of constant current DC-DC due to the fact that the number of LEDs is large and the types of signal lamps are large by selecting the inductor, the MOS tube and the diode with proper current.

Description

LED drive circuit and car light and car that have it

Technical Field

The utility model relates to a drive circuit field, more specifically relates to a LED drive circuit, car light and car that have this LED drive circuit.

Background

At present, the number of LEDs of signal lamps in the market is increasing, the required functions are becoming more and more complex, and most of the existing electronic schemes adopt a mode of cascading a plurality of constant current DC-DC or a plurality of IC driving chips for driving. The two schemes are high in cost and high in number of power devices.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least.

Therefore, the utility model provides a LED drive circuit, this LED drive circuit is applicable to the many circumstances of LED number, improves the commonality.

The utility model discloses still provide a car light, this car light can effective reduce cost.

The utility model discloses still provide a vehicle, this vehicle has advantages such as with low costs, efficient.

According to the utility model discloses LED drive circuit of first aspect embodiment, include: a DC-DC constant voltage power supply driving circuit capable of supplying a constant voltage to the LED driving circuit; the LED constant current driving circuit is used for boosting or reducing the voltage of an accessed power supply and then outputting the boosted or reduced voltage, and the LED constant current driving circuit is a triode constant current circuit or an IC constant current chip driving circuit; and the output stage circuit is used for outputting the voltage output by the LED constant current driving circuit to an LED.

According to the utility model discloses LED drive circuit cooperatees through adopting DC-DC constant voltage power supply drive circuit, LED constant current drive circuit and output stage circuit, when improving drive efficiency, has reduced power device's quantity, the effective cost is reduced.

According to the utility model discloses an embodiment, DC-DC constant voltage power supply drive circuit sets for output voltage according to series connection LED's maximum conducting voltage.

According to the utility model discloses an embodiment, DC-DC constant voltage power supply drive circuit's voltage output value sets for through changing the sampling resistance value.

According to the utility model discloses an embodiment, LED constant current drive circuit's drive current can change the resistance in order to be used for the simulation to adjust luminance.

According to the utility model discloses an embodiment, LED lamp cluster includes a plurality of LED, through DC-DC constant voltage power supply drive circuit provides the required pressure drop of LED, the rethread LED constant current drive circuit realizes electron N-1.

According to the utility model discloses an embodiment, DC-DC constant voltage power supply drive circuit exports with three kinds of topological structure of BUCK, BOOST, BUCK-BOOST to realize that two or more LED lamp cluster open under different signals stops.

According to the utility model discloses car light of second aspect embodiment, include above-mentioned any LED drive circuit.

According to the utility model discloses an embodiment, the car light is indicator, daytime running light or position lamp.

According to the utility model discloses car of third aspect embodiment, include any above-mentioned car light.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a circuit diagram of an LED driving circuit according to an embodiment of the present invention.

Reference numerals:

an LED driving circuit 100;

a DC-DC constant voltage power supply drive circuit 10; an LED constant current drive circuit 20; a triode constant current circuit 21; and an IC constant current chip driving circuit 22.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship indicated based on the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The LED driving circuit 100, and a vehicle lamp and a vehicle having the LED driving circuit 100 according to an embodiment of the present invention are described in detail below with reference to the drawings.

As shown in fig. 1, an LED driving circuit 100 according to an embodiment of the present invention includes: the LED constant-current driving circuit comprises a DC-DC constant-voltage power supply driving circuit 10, an LED constant-current driving circuit 20 and an output stage circuit.

Specifically, the DC-DC constant voltage power supply driving circuit 10 can provide a constant voltage for the LED driving circuit 100, the LED constant current driving circuit 20 is configured to boost or buck an input power supply voltage and then output the boosted or stepped-down power supply voltage, the LED constant current driving circuit 20 is a triode constant current circuit 21 or an IC constant current chip driving circuit 22, and the output stage circuit is configured to output the voltage output by the LED constant current driving circuit 20 to the LED.

In other words, the LED driving circuit 100 according to the embodiment of the present invention mainly comprises: the LED constant-current driving circuit comprises a DC-DC constant-voltage power supply driving circuit 10, an LED constant-current driving circuit 20 and an output stage circuit, wherein the DC-DC constant-voltage power supply driving circuit 10 is used for providing voltage output with wide range and high stability for an LED lamp, is suitable for the condition of multiple LEDs, can reduce the power of power devices as much as possible, and reduces the using amount of the same power devices to the maximum extent; the LED constant current driving circuit 20 adopts a mode of a triode constant current circuit 21 or an IC constant current chip driving circuit 22, under the condition that the number of LED lamps is large, normal lighting of the lamps can be achieved, and the triode constant current circuit 21 or the IC constant current chip driving circuit 22 can be selected by the LED constant current driving circuit 20 according to analysis of current size and circuit feasibility.

From this, according to the utility model discloses LED drive circuit 100 adopts DC-DC constant voltage power supply drive circuit 10, LED constant current drive circuit 20 and output stage circuit to combine together, has not only improved drive efficiency, has still reduced power device's quantity, effective reduce cost.

According to an embodiment of the present invention, the DC-DC constant voltage power supply driving circuit 10 can set the output voltage according to the maximum on voltage of the series LEDs. That is to say, the output voltage of the DC-DC constant voltage power supply driving circuit 10 can be set according to the maximum voltage drop required by the series connection of the LED lamps, and the power borne by a single triode in the triode constant current or the power borne by a single chip in the IC drive can be reduced, thereby achieving the purpose of reducing the number of power devices.

Specifically, when the LED constant current driving circuit 20 adopts the triode constant current circuit 21, the voltage drop of a single triode in the LED constant current driving circuit 20 can be reduced to the greatest extent, and the power is reduced under the condition of constant current, thereby reducing the number of triodes required by each group of series-connected LEDs.

When the LED constant current driving circuit 20 adopts the IC constant current chip driving circuit 22, the voltage borne by the IC linear driving chip of the LED can be reduced to the maximum, and the power of the IC driving chip can be controlled below 1.5W under the condition that the maximum current value borne by each channel output of the IC driving chip is achieved, so as to reduce the number of the IC driving chips and the heat of a single driving chip.

In some embodiments of the present invention, the voltage output value of the DC-DC constant voltage power driving circuit 10 can be set by changing the sampling resistance value, in other words, the DC-DC constant voltage power driving circuit 10 outputs the voltage drop required by the single string of LEDs by changing the magnitude of the sampling resistance value.

According to the utility model discloses an embodiment, LED constant current drive circuit 20's drive current can change the resistance in order to be used for the simulation to adjust luminance, that is to say, provides the LED lamp through LED constant current drive circuit 20 and normally lights required current to realize the simulation and adjust luminance.

It should be noted that the LED constant current driving circuit 20 may be divided into two types, i.e., a triode constant current circuit 21 and an IC constant current chip driving circuit 22, and the magnitude of the current may be set by changing the resistance, so as to implement analog dimming.

According to the utility model discloses an embodiment, LED lamp cluster includes a plurality of LEDs, provides the required pressure drop of LED through DC-DC constant voltage power supply drive circuit 10, realizes electron N-1 through LED constant current drive circuit 20 again, in the application of driving many LEDs, has avoided constant current DC-DC to realize under the condition of N-1 in needs, because of the LED is more and can't realize the problem of a set of series connection.

In some embodiments of the present invention, the DC-DC constant voltage power supply driving circuit 10 outputs three topology structures of BUCK, BOOST and BUCK-BOOST to realize the start and stop of two or more LED light strings under different signals, and the topology structure output of the DC-DC constant voltage power supply driving circuit 10 can be designed according to the requirement.

That is to say, the DC-DC constant voltage power supply driving circuit 10 outputs with three topology structures of BUCK, BOOST, and BUCK-BOOST, and not only can complete the setting of the output voltage by changing the sampling resistance value of the corresponding DC-DC chip, but also can meet the design requirements of the electronic scheme of two or more LED lamp strings, thereby achieving the functional requirements of starting and stopping, welcoming guests, and the like of different signal lamps, and effectively solving the problem that stable voltage drop cannot be provided or the power of a single driving chip is too high when the IC constant current driving needs to be started and stopped.

In summary, according to the present invention, the LED driving circuit 100 can provide stable and wide voltage output for the multiple groups of LEDs under the condition of serial connection, and has certain driving capability for most signal lamps, and has the advantages of low cost, high efficiency, wide application range, etc.

According to the utility model discloses the car light of second aspect embodiment includes the LED drive circuit 100 according to above-mentioned embodiment, because according to the utility model discloses LED drive circuit 100 has above-mentioned technological effect, consequently, according to the utility model discloses the car light also has corresponding technological effect, and reduce cost has reduced the quantity of power device. The lamps may be a turn signal lamp, a daytime running lamp or a position lamp, that is, the LED driving circuit 100 can normally turn on the turn signal lamp, the daytime running lamp or the position lamp.

According to the utility model discloses the vehicle of third aspect embodiment includes the car light according to above-mentioned embodiment, because according to the utility model discloses the car light has above-mentioned technological effect, consequently, according to the utility model discloses the vehicle also has corresponding technological effect, can effectual reduce cost promptly, raises the efficiency.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An LED driving circuit, comprising:

a DC-DC constant voltage power supply driving circuit capable of supplying a constant voltage to the LED driving circuit;

the LED constant current driving circuit is used for boosting or reducing the voltage of an accessed power supply and then outputting the boosted or reduced voltage, and the LED constant current driving circuit is a triode constant current circuit or an IC constant current chip driving circuit;

and the output stage circuit is used for outputting the voltage output by the LED constant current driving circuit to an LED.

2. The LED driving circuit according to claim 1, wherein the DC-DC constant voltage power supply driving circuit sets the output voltage according to a maximum on voltage of the series-connected LEDs.

3. The LED driving circuit according to claim 1, wherein a voltage output value of the DC-DC constant voltage power supply driving circuit is set by changing a sampling resistance value.

4. The LED driving circuit according to claim 1, wherein the driving current of the LED constant current driving circuit can change resistance value for analog dimming.

5. The LED driving circuit of claim 1, wherein the LED string comprises a plurality of LEDs, the voltage drop required by the LEDs is provided by the DC-DC constant voltage power supply driving circuit, and the electronic N-1 is realized by the LED constant current driving circuit.

6. The LED driving circuit according to claim 1, wherein the DC-DC constant voltage power supply driving circuit outputs in three topologies, i.e. BUCK, BOOST and BUCK-BOOST, so as to realize the start and stop of two or more LED lamp strings under different signals.

7. A vehicular lamp characterized by comprising the LED drive circuit according to any one of claims 1 to 6.

8. The vehicle light of claim 7, wherein the vehicle light is a turn signal light, a daytime running light, or a position light.

9. An automobile comprising the lamp according to claim 7 or 8.