Miniaturized multifunctional vehicle lamp buck circuit

Abstract

This utility model relates to the field of automotive lighting BUCK circuit technology, specifically disclosing a miniaturized multifunctional automotive lighting BUCK circuit, including: a BUCK chip; an input capacitor located on the VIN pin of the BUCK chip; an output capacitor located on the VOUT pin of the BUCK chip; and an output adjustment circuit, including a voltage divider resistor connected to the FB pin and VCC pin of the BUCK chip, a grounding resistor, and a control component for controlling the connection or disconnection of the voltage divider resistor and the VCC pin of the BUCK chip. This embodiment can achieve dual-function output of constant voltage and constant current, and has the advantages of high integration, small size, and strong flexibility. It can meet the development needs of miniaturization, modularization, and multifunctional integration of electronic devices, and has important theoretical significance and application value. It solves the problem in traditional automotive lighting circuits that require the integration of constant current and constant voltage chips on a single driver, which increases the number of components and cost of the design.

Description

Technical Field

[0001] This application relates to the field of automotive lamp BUCK circuit technology, and specifically discloses a miniaturized multifunctional automotive lamp BUCK circuit. Background Technology

[0002] In various applications of automotive lights, both constant voltage and constant current power supplies are required. Furthermore, with the continuous development of electronic devices, the demands on power modules are increasing. Traditional automotive light circuits typically design their constant voltage and constant current circuits separately, resulting in low integration and large size, failing to meet the demands for miniaturization and multi-functional integration. Currently, achieving both constant voltage and constant current functionality often requires integrating constant current and constant voltage chips onto a single driver. This not only increases the number of components and cost but also complicates the layout and size of the driver board in space-constrained environments, leading to complex design solutions. Therefore, this invention provides a miniaturized, multi-functional automotive light BUCK circuit to address these issues. Utility Model Content

[0003] The purpose of this invention is to solve the problem that in traditional vehicle lighting circuits, it is necessary to integrate constant current chips and constant voltage chips on a single driver, which increases the number of components and cost of the design.

[0004] To achieve the above objectives, the basic solution of this utility model provides a miniaturized multi-functional vehicle light BUCK circuit, comprising:

[0005] BUCK chip;

[0006] Set the input capacitance at the VIN pin of the BUCK chip;

[0007] Set the output capacitor on the VOUT pin of the BUCK chip;

[0008] The output regulation circuit includes a voltage divider resistor connected to the FB and VCC pins of the BUCK chip, a grounding resistor, and a control component for controlling whether the voltage divider resistor is connected to or disconnected from the VCC pin of the BUCK chip.

[0009] Furthermore, the output adjustment circuit also includes an FB resistor disposed between the voltage divider resistor and the grounding resistor. When the voltage divider resistor is only connected to the FB pin of the BUCK chip, the FB resistor is disconnected from the voltage divider resistor. When the voltage divider resistor is connected to both the FB pin and the VCC pin of the BUCK chip, the FB resistor is connected between the voltage divider resistor and the grounding resistor.

[0010] Furthermore, several diodes are provided between the VOUT pin of the BUCK chip and the FB resistor.

[0011] Furthermore, the reference voltage of the FB pin of the BUCK chip is 0.8V, and the resistance value of the voltage divider resistor is 100kΩ.

[0012] Furthermore, the resistance value of the FB resistor is 16kΩ.

[0013] Furthermore, the control component includes a first connection segment and a second connection segment respectively disposed between the voltage divider resistor and the VOUT pin of the BUCK chip and the VCC pin of the BUCK chip, a third connection segment disposed between the FB pin of the BUCK chip and the grounding resistor and connected in parallel with the FB resistor, and a plurality of control switches respectively controlling the connection of the first connection segment, the second connection segment and the third connection segment.

[0014] The principle and effect of this solution are as follows:

[0015] In environments requiring constant voltage output, this invention uses a reference voltage of 0.8V at the FB pin and controls the output voltage through a voltage divider resistor to achieve constant voltage output. In environments requiring constant current output, this invention uses the reference voltage of the FB pin and VCC together to make the output 0.4V, and then uses a grounding resistor to control the current to achieve constant current output.

[0016] Compared with existing technologies, this invention achieves dual-function output of constant voltage and constant current, using a single chip to meet the needs of both constant voltage and constant current operating modes, improving integration and reducing costs. Furthermore, the integrated circuit is flexible, functioning as either BUCK-CC (constant current mode) or BUCK-CV (constant voltage mode), facilitating modular construction and simplifying the design. The design is simple, eliminating the need to integrate constant current and constant voltage chips on a single driver, thus resolving layout and size issues. Moreover, it enables miniaturization of the vehicle light drive circuit, meeting the market demand for multi-functional, highly integrated, and miniaturized devices.

[0017] This invention employs an integrated design, resulting in low cost and effectively reducing the manufacturing cost of automotive lighting circuits, thus meeting the cost control needs of automakers. Its high flexibility and modular construction facilitate modification and adjustment according to actual needs, further satisfying the diverse and multifunctional circuit design requirements of automakers. Due to its advanced nature, this invention has wide applications in automotive lighting equipment manufacturing, electronic circuit design, and power protection equipment manufacturing. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This paper shows a schematic diagram of the constant current output mode in a miniaturized multi-functional vehicle light BUCK circuit proposed in an embodiment of this application;

[0020] Figure 2 A schematic diagram of the constant voltage output mode in a miniaturized multi-functional vehicle light BUCK circuit proposed in an embodiment of this application is shown. Detailed Implementation

[0021] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0022] The reference numerals in the accompanying drawings include: Input capacitor C IN Input resistance R EN_H、输出电容COUT PG resistor R PG Voltage divider resistor R UP FB resistor R FB Grounding resistance R DN Grounding capacitor C VCC .

[0023] A miniaturized multi-functional vehicle light BUCK circuit, implemented as follows: Figure 1 and Figure 2 As shown: This includes the BUCK chip and the input capacitor C located on the VIN pin of the BUCK chip. IN Let C be the output capacitor on the VOUT pin of the BUCK chip. OUT And an output regulation circuit for adjusting constant voltage and constant current output modes.

[0024] An input resistor R is set between the VIN and EN pins of the BUCK chip. EN_H；BUCK芯片的PG引脚与VCC引脚之间设置PG电阻RPG The VCC of the BUCK chip is set with a grounding capacitor C. VCC .

[0025] The output regulation circuit includes a voltage divider resistor R connected to the FB and VCC pins of the BUCK chip. UP Grounding resistance R DN Let the voltage divider resistor R be... UP Grounding resistance R DN The resistance between FB and RFB , used to control the voltage divider resistor R UP Connecting or disconnecting the VCC pin of the BUCK chip, and the FB resistor R FB A control component for connection or disconnection; the control component includes components respectively located on the voltage divider resistors R UP The first connection segment between the VOUT pin and the VCC pin of the BUCK chip, the second connection segment, and the resistor R between the FB pin of the BUCK chip and ground. DN Between and with FB resistor R FB The third connecting segment is connected in parallel, and several control switches control the connection of the first, second, and third connecting segments respectively. The VOUT pin of the BUCK chip is connected to the FB resistor R. FB There is also a fourth connection section that is controlled to be connected or disconnected by a control switch, and several diodes are provided on the fourth connection end.

[0026] like Figure 1 As shown, with a sampling resistor of 0.2 ohms as the reference, the reference voltage of the FB pin of the BUCK chip is 0.8V, and the voltage divider resistor R... UP The resistance value is 100kΩ, FB resistor R FB With a resistance of 16kΩ, in environments requiring constant current output, the voltage divider resistor R... UP It is connected to both the FB and VCC pins of the BUCK chip, and is connected to the FB resistor R. FB The connection is established, allowing the FB pin to work in conjunction with the reference voltage of VCC to output 0.4V, which is then utilized by the grounding resistor R. DN To control the current in order to achieve constant current output; such as Figure 2 As shown, in environments requiring constant voltage output, a reference voltage of 0.8V is used at pin FB, and a voltage divider resistor R is applied. UP To control the output voltage and achieve constant voltage output, the grounding capacitor C can be removed when using constant voltage output. VCC That is, by controlling the switch to make the grounding capacitor C VCC disconnect.

[0027] This embodiment can achieve dual-function output of constant voltage and constant current, and has the advantages of high integration, small size and strong flexibility. It can meet the development needs of miniaturization, modularization and multi-functional integration of electronic devices, and has important theoretical significance and application value.

[0028] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any indirect modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A miniaturized multifunctional vehicle lamp BUCK circuit, characterized by, include: BUCK chip; Set the input capacitance at the VIN pin of the BUCK chip; Set the output capacitor on the VOUT pin of the BUCK chip; The output regulation circuit includes a voltage divider resistor connected to the FB and VCC pins of the BUCK chip, a grounding resistor, and a control component for controlling whether the voltage divider resistor is connected to or disconnected from the VCC pin of the BUCK chip.

2. The miniaturized multi-functional vehicle light BUCK circuit according to claim 1, characterized in that, The output adjustment circuit also includes an FB resistor located between the voltage divider resistor and the grounding resistor. When the voltage divider resistor is only connected to the FB pin of the BUCK chip, the FB resistor is disconnected from the voltage divider resistor. When the voltage divider resistor is connected to both the FB pin and the VCC pin of the BUCK chip, the FB resistor is connected between the voltage divider resistor and the grounding resistor.

3. The miniaturized multi-functional vehicle light BUCK circuit according to claim 2, characterized in that, Several diodes are also provided between the VOUT pin of the BUCK chip and the FB resistor.

4. The miniaturized multi-functional vehicle light BUCK circuit according to claim 1, characterized in that, The reference voltage of the FB pin of the BUCK chip is 0.8V, and the resistance of the voltage divider resistor is 100kΩ.

5. A miniaturized multi-functional vehicle light BUCK circuit according to claim 2, characterized in that, The resistance value of the FB resistor is 16kΩ.

6. The miniaturized multi-functional vehicle light BUCK circuit according to claim 1, characterized in that, The control component includes a first connection segment and a second connection segment respectively located between the voltage divider resistor and the VOUT pin of the BUCK chip, and between the VCC pin of the BUCK chip; a third connection segment located between the FB pin of the BUCK chip and the grounding resistor and connected in parallel with the FB resistor; and several control switches that control the connection of the first connection segment, the second connection segment, and the third connection segment respectively.

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