CN218603675U

CN218603675U - Car power amplifier backlight light-in display circuit

Info

Publication number: CN218603675U
Application number: CN202222227582.XU
Authority: CN
Inventors: 蔡加兴; 李敏
Original assignee: Dongguan Tianyi Electronics Co ltd
Current assignee: Dongguan Tianyi Electronics Co ltd
Priority date: 2022-08-24
Filing date: 2022-08-24
Publication date: 2023-03-10
Anticipated expiration: 2032-08-24

Abstract

The utility model discloses a car power amplifier backlight lamp fade-in display circuit belongs to backlight circuit technical field. The utility model discloses a direct current power supply, a plurality of diode, a plurality of electric capacity and a plurality of backlight module, direct current power supply links to each other with a diode D1 and an electric capacity C1, diode D1 is connected with operational amplifier U1 and triode Q1, direct current power supply has diode D2 and current-limiting resistance R1 still in parallel, current-limiting resistance R1 is connected with electric capacity C2, operational amplifier U1 is connected with triode Q1, still be equipped with current-limiting resistance R2 between operational amplifier U1 and the triode Q1, triode Q1's base links to each other with current-limiting resistance R2, triode Q1's collecting electrode is connected with a plurality of backlight module. The utility model discloses applied components and parts are few, and use cost is low, need not singlechip and software control.

Description

Car power amplifier backlight light-in display circuit

Technical Field

The utility model belongs to the technical field of backlight circuit, especially, relate to a car power amplifier backlight fades in display circuit.

Background

At present, brand LOGO backlight lamps and product decorative lamps on all automobile power amplifier products are in a traditional direct lighting mode, and are only changed in the aspects of color and shape all the time, when automobile light is started, the light is usually directly lighted to the highest brightness, a small number of high-end automobiles select a single chip microcomputer and software to accurately regulate and control the backlight lamps, so that the light can be gradually lighted in a light-in mode, but the technology has the advantages of multiple application components, high use cost and more complex control program.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a car power amplifier backlight fades in display circuit solves prior art and uses the problem that components and parts are many, use cost is high and control procedure is comparatively complicated.

In order to solve the technical problem, the utility model discloses a realize through following technical scheme:

the utility model relates to a car power amplifier backlight fade-in display circuit, including DC power supply, a plurality of diodes, a plurality of electric capacity and a plurality of backlight modules, DC power supply links to each other with a diode D1 and an electric capacity C1, diode D1 is connected with operational amplifier U1 and triode Q1; the direct current power supply is also connected with a diode D2 and a current-limiting resistor R1 in parallel, and the current-limiting resistor R1 is connected with a capacitor C2; the operational amplifier U1 is respectively provided with a pin 1, a pin 2, a pin 3, a pin 4 and a pin 8, the pin 3 at the input end is connected with the current-limiting resistor R1, and the voltage of the pin 1 at the output end and the pin 3 at the input end rises synchronously; the operational amplifier U1 is connected with a current-limiting resistor R2, the current-limiting resistor R2 is connected with a triode Q1, the base of the triode Q1 is connected with the current-limiting resistor R2, the triode Q1, and the collector of the triode Q1 is connected with a plurality of backlight modules.

The utility model discloses following beneficial effect has:

the utility model discloses applied components and parts are few, and use cost is low, need not singlechip and software control. The LED lamp bank is supplied with voltage through the current-limiting resistor, the capacitor, the operational amplifier and the triode, and the LED brightness can gradually reach the highest brightness when the supply voltage is electrified through the backlight lamp or the decorative lamp of the circuit, so that the lighting effect of starting the lamp each time can have the effect of slowly fading in from dark to bright within a certain time, the novelty of the product is enhanced, the circuit can be applied to various types of electronic product decorative lamps, and the application is wide.

Of course, it is not necessary for any particular product to achieve all of the above-described advantages at the same time.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic connection diagram of a backlight lamp fade-in display circuit of a power amplifier of an automobile according to the present invention.

In the drawings, the components represented by the respective reference numerals are listed below: 1. a backlight module is provided.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in 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 of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

Please refer to fig. 1, the utility model relates to a display circuit for fade-in of car power amplifier backlight, which comprises a dc power supply, a plurality of diodes, a plurality of capacitors and a plurality of backlight modules 1, wherein the dc power supply is connected with a diode D1 and a capacitor C1, the dc power supply emits 12V dc current, the diode D1 is connected with an operational amplifier U1 and a triode Q1, the current enters the capacitor C1 through the diode D1 to be filtered and then is input to the 8 pin of the operational amplifier U1 and the collector of the triode Q1 to provide voltage;

the operational amplifier U1 is connected with a triode Q1, a current limiting resistor R2 is further arranged between the operational amplifier U1 and the triode Q1, the base of the triode Q1 is connected with the current limiting resistor R2, the collector of the triode Q1 is connected with a plurality of backlight modules, and the current limiting resistor R1 is large in resistance and reduces current charged to a capacitor C2;

the operational amplifier U1 is connected with current-limiting resistor R2, and current-limiting resistor R2 is connected with triode Q1, and when the electric current reached triode Q1's base through current-limiting resistor R2, triode Q1's base and projecting pole were in positive deviation, triode Q1's base and current-limiting resistor R2 link to each other, triode Q1's collecting electrode is connected with a plurality of backlight module 1, and triode Q1 switches on and begins the power supply to backlight module 1.

The backlight module 1 comprises a current-limiting resistor and at least two LED lamps, the breakover voltage of the LED lamps is 3.8V, the highest normally-on voltage of the LED lamps is 12V, the LED lamps start to emit light when the voltage is 3.8V, and the LED lamps enter the highest normally-on state when the voltage is increased to 12V.

Each backlight module 1 is connected in parallel in the circuit and is communicated with the capacitor C2, and the time of the fade-in effect of the LED lamp can be changed by adjusting the capacitance value of the capacitor C2.

And the capacitor C1 is respectively connected with the pin 8 of the operational amplifier U1 and the collector of the triode Q1.

The operational amplifier U1 is respectively provided with a pin 1, a pin 2, a pin 3, a pin 4 and a pin 8, the pin 3 at the input end is connected with the current-limiting resistor R1, the voltage of the pin 1 at the output end and the pin 3 at the input end rises synchronously, and the voltage of the pin 3 rises gradually from 0V to + 12V.

One specific application of this embodiment is: the DC power supply is filtered by a diode D1 to a capacitor C1 and then provides voltage for an 8 th pin of an operational amplifier U1 and a collector of a triode Q1, in addition, a current limiting resistor R1 is used for charging a capacitor C2 and providing input voltage for a 3 rd pin of a non-inverting input end of the operational amplifier U1, the current for charging the capacitor C2 is small because the resistance value of the current limiting resistor R1 is large, the voltage of the 3 rd pin of the non-inverting input end of the operational amplifier U1 is a gradually rising process from 0V to +12V, according to the characteristics of a follower circuit formed by the operational amplifier in the figure, the voltage of the 1 st pin of an output end of the operational amplifier U1 is gradually raised along with the synchronous change of the 3 rd pin of the non-inverting input end, when the voltage is raised to about 3.8V of the conducting voltage of an LED lamp, the current starts to reach a base electrode of the triode Q1 through the current limiting resistor R2, at the moment, the base electrode and an emitting electrode of the triode Q1 are in positive bias, the triode Q1 starts to be conducted, the +12V voltage of the collector of the triode Q1 reaches the current-limiting resistors R3, R4, R5 and R6 through the triode, the output voltage of the emitter of the triode Q1 rises in synchronization with the increase of the base voltage, so that the current flowing through the current-limiting resistors R3, R4, R5 and R6 in the backlight module 1 and the current of the LED lamps LED1, LED2, LED3, LED4, LED5, LED6, LED7 and LED8 also gradually increases, the brightness of the LED lamps LED1, LED2, LED3, LED4, LED5, LED6 and LED8 gradually increases along with the increase of the current until the voltage at two ends of the capacitor C2 is fully charged to +12V, and the capacitor C2 is kept in the highest normally-on state, wherein the capacitor C2 can be changed to change the time of the power-on or power-on effect of the LED lamps LED1, LED2, LED3, LED4, LED5, LED6, light LED7 and LED8, and the diode D2 is mainly used for power-off or power-on for releasing the next time or power-on preparation.

In the description of the present specification, reference to the description of "one embodiment," "an example," "a specific example," etc., means 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 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.

The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and its practical applications, to thereby enable others skilled in the art to best understand the invention for and utilize the invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A backlight lamp fade-in display circuit of a car power amplifier is characterized in that: the LED backlight module comprises a direct current power supply, a plurality of diodes, a plurality of capacitors and a plurality of backlight modules, wherein the direct current power supply is connected with a diode D1 and a capacitor C1, and the diode D1 is connected with an operational amplifier U1 and a triode Q1;

the direct current power supply is also connected with a diode D2 and a current-limiting resistor R1 in parallel, and the current-limiting resistor R1 is connected with a capacitor C2;

the LED backlight module is characterized in that the operational amplifier U1 is connected with a triode Q1, a current limiting resistor R2 is further arranged between the operational amplifier U1 and the triode Q1, the base of the triode Q1 is connected with the current limiting resistor R2, and the collector of the triode Q1 is connected with a plurality of backlight modules.

2. The power amplifier backlight fade-in display circuit of the automobile according to claim 1, wherein the backlight module comprises a current limiting resistor and at least two LED lamps, the turn-on voltage of the LED lamps is 3.8V, and the maximum normal brightness voltage of the LED lamps is 12V.

3. The backlight fading display circuit of claim 2, wherein each backlight module is connected in parallel to each other and is connected to the capacitor C2.

4. The backlight lamp fade-in display circuit of the power amplifier of the automobile as claimed in claim 3, wherein the capacitor C1 is connected to the pin 8 of the operational amplifier U1 and the collector of the triode Q1 respectively.

5. The backlight lamp fade-in display circuit of the automobile power amplifier according to claim 3, wherein the operational amplifier U1 is respectively provided with a pin 1, a pin 2, a pin 3, a pin 4 and a pin 8, the pin 3 is connected with the current limiting resistor R1, and the pin 1 is electrically connected with the pin 3.