CN215417491U - Software-controllable small-screen backlight driving circuit - Google Patents
Software-controllable small-screen backlight driving circuit Download PDFInfo
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- CN215417491U CN215417491U CN202120758606.7U CN202120758606U CN215417491U CN 215417491 U CN215417491 U CN 215417491U CN 202120758606 U CN202120758606 U CN 202120758606U CN 215417491 U CN215417491 U CN 215417491U
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Abstract
The utility model discloses a software-controllable small-screen backlight driving circuit, which relates to the technical field of visual doorbells and comprises a control chip U1, an inductance coil L1, a diode D1, a capacitor C1, a capacitor C2, a capacitor C3, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5 and a resistor R6. The utility model forms a circuit for controlling backlight current by software through a resistor R3, a resistor R4, a resistor R5, a resistor R6 and a capacitor C3; the resistor R3 is a matching resistor, the resistor R4 is a constant current source of a reference, the current is VFB/R4, the resistor R6 and the capacitor C3 form a low-pass filter to convert the PNL _ PWM signal into direct current voltage, the resistor R5 adds the converted voltage to the cathode of the LED, the larger the added voltage is, the smaller the current on the LED is, and theoretically, the current can be adjusted from 0 to (VFB/R4), so that the backlight circuit suitable for different voltage and current is facilitated under the condition of not changing hardware, the practicability is improved, and the manufacturing and material preparation cost is saved.
Description
Technical Field
The utility model relates to the technical field of visual doorbells, in particular to a software-controllable small-screen backlight driving circuit.
Background
The small screen used in the current visual doorbell market has various backlight circuits, and particularly in the market shortage state of the current screen, one driving board is often adapted to screens of various backlight types, and the corresponding backlight driving circuit hardware is needed to be matched with each screen backlight circuit according to the traditional method, so that the small screen has great defects in production and material preparation.
Therefore, it is necessary to invent a software controllable small screen backlight driving circuit to solve the above problems.
SUMMERY OF THE UTILITY MODEL
The present invention is directed to a software-controllable small-screen backlight driving circuit, so as to solve the problems mentioned in the background art.
In order to achieve the purpose, the utility model provides the following technical scheme: a software-controllable small-screen backlight driving circuit comprises a control chip U1, an inductance coil L1, a diode D1, a capacitor C1, a capacitor C2, a capacitor C3, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5 and a resistor R6, wherein an EN pin of the control chip U1 is connected with an input end of a resistor R1 through an electric wire, an output end of the resistor R1 is connected with an input end of a resistor R2 and a control pin PNL _ EN through an electric wire, an output end of the resistor R2 is connected with an input end of the capacitor C2 through an electric wire, an output end of the capacitor C2 is connected with an input end of the resistor R2 through an electric wire, an output end of the resistor R2 is connected with an electric wire, an FB pin of the control chip U2 is connected with an input end of the resistor R2 through an electric wire, an output end of the resistor R2 is connected with an input end of the resistor R2 and an output end of the capacitor C2 through an electric wire, the input end of the resistor R4 is connected with the output end of the resistor R3 and the input end of the resistor R5 through wires, the output end of the resistor R4 is connected with the input end of the capacitor C3 and the output end of the resistor R2 through wires, and the GND pin of the control chip U1, the output end of the resistor R2, the input end of the resistor R4 and the input end of the capacitor C3 are all grounded.
Preferably, the input end of the capacitor C1 is connected to a power VCC wire, and the output end of the capacitor C1 is grounded.
Preferably, the SW pin and the IN pin of the control chip U1 are connected to the output terminal and the input terminal of the inductor L1, respectively, and the input terminal of the inductor L1 is connected to the IN pin of the control chip U1 and then connected to the power VCC wire.
Preferably, the output end of the inductor L1 is connected to the SW pin of the control chip U1 and then connected to the input end of the diode D1 through a wire, the output end of the diode D1 is connected to the input end of the capacitor C2 through a wire, and the output end of the capacitor C2 is grounded.
Preferably, the BST pin of the control chip U1 is electrically connected to the output terminal of the diode D1 and the input terminal of the capacitor C2.
The utility model has the technical effects and advantages that:
the utility model forms a circuit for controlling backlight current by software through a resistor R3, a resistor R4, a resistor R5, a resistor R6 and a capacitor C3; the resistor R3 is a matching resistor, the resistor R4 is a constant current source of a reference, the current is VFB/R4, the resistor R6 and the capacitor C3 form a low-pass filter to convert the PNL _ PWM signal into direct current voltage, the resistor R5 adds the converted voltage to the cathode of the LED, the larger the added voltage is, the smaller the current on the LED is, and theoretically, the current can be adjusted from 0 to (VFB/R4), so that the backlight circuit suitable for different voltage and current is facilitated under the condition of not changing hardware, the practicability is improved, and the manufacturing and material preparation cost is saved.
Drawings
Fig. 1 is a schematic diagram of the overall circuit structure of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The utility model provides a software-controllable small-screen backlight driving circuit as shown in fig. 1, which comprises a control chip U1, an inductance coil L1, a diode D1, a capacitor C1, a capacitor C2, a capacitor C3, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5 and a resistor R6, wherein an EN pin of the control chip U1 is connected with an input terminal of the resistor R1 through an electric wire, an output terminal of the resistor R1 is connected with an input terminal of the resistor R2 and a control pin PNL _ EN through an electric wire, an output terminal of the resistor R2 is connected with an input terminal of the capacitor C2 through an electric wire, an output terminal of the capacitor C2 is connected with an input terminal of the resistor R2 through an electric wire, an output terminal of the resistor R2 is connected with an electric wire of the PNL _ PWM pin, an FB pin of the control chip U2 is connected with an input terminal of the resistor R2 through an electric wire, an output terminal of the resistor R2 is connected with an input terminal of the capacitor R2 through an electric wire, the input end of the resistor R4 is connected with the output end of the resistor R3 and the input end of the resistor R5 through wires, the output end of the resistor R4 is connected with the input end of the capacitor C3 and the output end of the resistor R2 through wires, and the GND pin of the control chip U1, the output end of the resistor R2, the input end of the resistor R4 and the input end of the capacitor C3 are all grounded; a circuit for controlling backlight current by software is formed by a resistor R3, a resistor R4, a resistor R5, a resistor R6 and a capacitor C3; the resistor R3 is a matching resistor, the resistor R4 is a constant current source of a reference, the current is VFB/R4, the resistor R6 and the capacitor C3 form a low-pass filter to convert the PNL _ PWM signal into direct current voltage, the R5 adds the converted voltage to the cathode of the LED, the larger the added voltage is, the smaller the current on the LED is, and theoretically, the current can be adjusted from 0 to (VFB/R4), so that the backlight circuit suitable for different voltage and current is convenient under the condition of not changing hardware, the practicability is improved, and the manufacturing and material preparation cost is saved.
The input and the power VCC connection of electric wire of electric capacity C1, electric capacity C1's output ground connection, control chip U1's SW pin and IN pin are connected with inductance coil L1's output and input respectively, inductance coil L1's input is connected the back with power VCC connection of electric wire with control chip U1's IN pin, inductance coil L1's output and control chip U1's SW pin are connected the back and are connected with diode D1's input connection of electric wire, diode D1's output and electric capacity C2's input connection of electric wire, electric capacity C2's output ground connection, control chip U1's BST pin and diode D1's output and electric capacity C2's input connection of electric wire.
The capacitor C1, the inductor L1, the diode D1, the control chip U1 and the capacitor C2 are all classic boost LED drivers, and are not limited to the model and value in the drawing.
The working principle of the utility model is as follows:
when the circuit is used, the resistor R1 and the resistor R2 form a backlight switch circuit, the resistor R1 is a matched resistor, the resistor R2 is pulled down to prevent the control pin PNL _ EN from being triggered by mistake during resetting, and a circuit for controlling backlight current through software is formed by the resistor R3, the resistor R4, the resistor R5, the resistor R6 and the capacitor C3; the resistor R3 is a matching resistor, the resistor R4 is a constant current source of a reference, the current is VFB/R4, the resistor R6 and the capacitor C3 form a low-pass filter to convert the PNL _ PWM signal into direct current voltage, the resistor R5 adds the converted voltage to the cathode of the LED, the larger the added voltage is, the smaller the current on the LED is, and theoretically, the current can be adjusted from 0 to (VFB/R4), so that the backlight circuit suitable for different voltage and current is facilitated under the condition of not changing hardware, the practicability is improved, and the manufacturing and material preparation cost is saved.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the utility model.
Claims (5)
1. The utility model provides a small screen backlight drive circuit that software is controllable which characterized in that: the controller comprises a control chip U1, an inductance coil L1, a diode D1, a capacitor C1, a capacitor C2, a capacitor C3, a resistor R1 and a resistor R1, wherein an EN pin of the control chip U1 is in electric wire connection with an input end of the resistor R1, an output end of the resistor R1 is in electric wire connection with an input end of the resistor R1 and a control pin PNL _ EN, an output end of the resistor R1 is in electric wire connection with an input end of the capacitor C1, an output end of the capacitor C1 is in electric wire connection with an input end of the resistor R1, an output end of the resistor R1 is in electric wire connection with an input end of the resistor R1 and an output end of the capacitor C1, an FB pin of the control chip U1 is in electric wire connection with an input end of the resistor R1, an output end of the resistor R1 is in electric wire connection with an input end of the resistor R1 and the input end of the resistor R1, and the resistor R1 are in electric wire connection with the input end of the resistor R1, the output end of the resistor R4 is connected with the input end of the capacitor C3 and the output end of the resistor R2 through wires, and the GND pin of the control chip U1, the output end of the resistor R2, the input end of the resistor R4 and the input end of the capacitor C3 are all grounded.
2. The software-controllable small-screen backlight driving circuit according to claim 1, wherein: the input end of the capacitor C1 is connected with a power supply VCC electric wire, and the output end of the capacitor C1 is grounded.
3. The software-controllable small-screen backlight driving circuit according to claim 1, wherein: SW pin and IN pin of control chip U1 are connected with inductor L1's output and input respectively, inductor L1's input is connected back and is connected with power VCC electric wire with control chip U1's IN pin.
4. The software-controllable small-screen backlight driving circuit according to claim 3, wherein: the output end of the inductance coil L1 is connected with the SW pin of the control chip U1 and then is connected with the input end of the diode D1 through a wire, the output end of the diode D1 is connected with the input end of the capacitor C2 through a wire, and the output end of the capacitor C2 is grounded.
5. The software-controllable small-screen backlight driving circuit according to claim 4, wherein: the BST pin of the control chip U1 is electrically connected with the output end of the diode D1 and the input end of the capacitor C2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120758606.7U CN215417491U (en) | 2021-04-14 | 2021-04-14 | Software-controllable small-screen backlight driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120758606.7U CN215417491U (en) | 2021-04-14 | 2021-04-14 | Software-controllable small-screen backlight driving circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215417491U true CN215417491U (en) | 2022-01-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120758606.7U Active CN215417491U (en) | 2021-04-14 | 2021-04-14 | Software-controllable small-screen backlight driving circuit |
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| Country | Link |
|---|---|
| CN (1) | CN215417491U (en) |
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2021
- 2021-04-14 CN CN202120758606.7U patent/CN215417491U/en active Active
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