Multi-channel grouping control circuit

Abstract

The utility model provides a multichannel grouping control circuit, comprising a power supply circuit for providing electric energy and a load circuit, a constant voltage drive circuit and a constant current drive circuit are successively connected in series between the power supply circuit and the load circuit, and a control circuit is connected in parallel between the constant voltage drive circuit and the constant current drive circuit; and the control circuit is in data intercommunication with the constant-current driving circuit through a CAN bus so as to independently control the operation of a plurality of LED lamps in the load circuit. According to the utility model, a large batch of LED lamps can be independently controlled, so that the car lamp presents a smooth animation effect.

Description

Technical Field

[0001] This utility model relates to the field of lighting control technology, specifically to a multi-channel group control circuit. Background Technology

[0002] Vehicle lights are tools used for road illumination and advance warning when driving at night. They include headlights, taillights, and turn signals. Currently, LEDs are the preferred light source for automotive taillights and are widely and maturely applied to various functional automotive signal lights. When LEDs are used as point light sources in signal lights, multiple LEDs are generally needed to achieve a single function.

[0003] Due to the limitations of point light source illumination, it is difficult to achieve dynamic effects from multiple LEDs using LED light source control circuits, thus failing to achieve the desired visual effect. To enhance the appeal of vehicles, OLED headlights can display rich dynamic display effects by strategically arranging LED light sources and leveraging their superior planar light source performance, effectively compensating for the unevenness of existing LED headlight illumination. However, controlling a large number of LEDs to create animated effects remains a pressing issue that needs to be addressed. Utility Model Content

[0004] In view of this, the problem to be solved by this utility model is to provide a multi-channel group control circuit that can individually control a large number of LED lights, so that the vehicle lights present a smooth animation effect.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0006] A multi-channel group control circuit includes a power supply circuit and a load circuit that provide electrical energy. A constant voltage drive circuit and a constant current drive circuit are connected in series between the power supply circuit and the load circuit. A control circuit is connected in parallel between the constant voltage drive circuit and the constant current drive circuit.

[0007] The control circuit communicates with the constant current drive circuit via the CAN bus to individually control the operation of several LEDs in the load circuit.

[0008] Furthermore, the constant voltage circuit includes a first driver chip U2, the PVIN pin of the first driver chip U2 is connected to the VBAT-VIN port, and the VBAT-VIN port is used to output electrical energy;

[0009] A capacitor C14, a resistor R5, and an inductor L1 are connected in series between the BST pin of the first driver chip U2 and the DC5V port. The SW pin of the first driver chip U2 is connected to the input terminal of the inductor L1. The VOUT-SNS pin of the first driver chip U2 is connected to the output terminal of the inductor L1. A resistor R6 is connected in series between the FB pin of the first driver chip U2 and the output terminal of the inductor L1.

[0010] Furthermore, the constant current driving circuit includes a second driving chip U3, which includes several LED pins that output DC power. The load circuit includes several LEDs. An LED is connected in series with the LED pins of the second driving chip U3 and the DC5V port, and the current and brightness of the LEDs are controlled according to the output voltage of the LED pins.

[0011] Furthermore, the control circuit includes a control chip U1, whose pins 10 and 11 are respectively connected to the SWD-CLK port and the SWD-DIO port for receiving load control signals.

[0012] Furthermore, the power supply circuit includes a POWER+ port for outputting electrical energy. A forward-biased diode D1 is connected in series between the POWER+ port and the VBAT-VIN port. A transient voltage suppression diode TVS1, a resistor R1, and a capacitor C1 are connected in series between the POWER+ port and the ground terminal for outputting electrical energy.

[0013] Furthermore, capacitors C12, C11, C9, C10, and C13 are connected in series between the DC5V port and the ground terminal, respectively.

[0014] Furthermore, a capacitor is connected in series between the LED pin and ground of the second driver chip U3 to improve the stability of LED lamp control.

[0015] The advantages and positive effects of this utility model are:

[0016] The system employs a load circuit consisting of several LEDs and a constant-voltage drive circuit providing a stable 5V voltage. The constant-current drive circuit includes a second driver chip U3 that controls the voltage of each LED pin. LEDs are connected in series between their pins and the DC 5V port. The control circuit includes a control chip U1, which communicates with the second driver chip U3 via a CAN bus. Control chip U1 converts control signals into data packets and transmits them to the second driver chip U3 via the CAN bus. The second driver chip U3 controls the output voltage of each LED pin based on the data packets, thereby individually controlling the brightness of each LED and creating a smooth, animated effect for the vehicle lights. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0018] Figure 1 This is an overall system diagram of a multi-channel group control circuit according to this utility model;

[0019] Figure 2 This is a power supply circuit diagram of a multi-channel group control circuit according to this utility model;

[0020] Figure 3 This is a constant voltage drive circuit diagram of a multi-channel group control circuit according to this utility model;

[0021] Figure 4 This is a control circuit diagram of a multi-channel group control circuit according to this utility model;

[0022] Figure 5 This is a constant current drive circuit diagram of a multi-channel group control circuit according to this utility model;

[0023] Figure 6 This is a load circuit diagram of a multi-channel group control circuit according to this utility model. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0026] This utility model provides a multi-channel group control circuit, such as Figure 1 As shown, it includes a power supply circuit that provides electrical energy and a load circuit consisting of several LEDs. A constant voltage drive circuit and a constant current drive circuit are connected in series between the power supply circuit and the load circuit. A control circuit is connected in parallel between the constant voltage drive circuit and the constant current drive circuit.

[0027] like Figure 2As shown, the power supply circuit includes a POWER+ port for providing power and a VBAT-VIN port for outputting power, a transient voltage suppressor diode (TVS1), a resistor (R1), a capacitor (C1), and a diode (D1). A forward-biased diode (D1) is connected in series between the POWER+ port and the VBAT-VIN port to reduce the probability of reverse current. A transient voltage suppressor diode (TVS1), a resistor (R1), and a capacitor (C1) are connected in series between the POWER+ port and ground to improve current stability and prevent interference with subsequent circuits.

[0028] like Figure 3 As shown, the constant voltage circuit includes a first driver chip U2, which includes a PVIN pin for receiving electrical energy and an EN pin for the driver chip. The VBAT-VIN port is connected to the PVIN pin of the first driver chip U2. A resistor R4 is connected in series between the VBAT-VIN pin and the EN pin of the first driver chip U2, and a resistor R7 is connected in series between the EN pin of the first driver chip U2 and ground. The VBAT-VIN pin inputs electrical energy to the first driver chip U2 and simultaneously powers the EN pin, thus starting the operation of the first driver chip U2.

[0029] The first driver chip U2 includes a VOUT-SNS pin for data acquisition and output, a BST pin for output power, a SW pin for control switching, and an FB pin for output control. A capacitor C14, a resistor R5, and an inductor L1 are connected in series between the BST pin of the first driver chip U2 and the DC 5V port. The SW pin of the first driver chip U2 is connected to the input terminal of inductor L1, and the VOUT-SNS pin of the first driver chip U2 is connected to the output terminal of inductor L1, used to monitor the output voltage of the first driver chip U2. A resistor R6 is connected in series between the FB pin of the first driver chip U2 and the output terminal of inductor L1, and a resistor R8 is connected in series between the FB pin of the first driver chip U2 and ground.

[0030] The first driver chip U2 outputs power through the BST pin, which is then filtered by inductor L1 and outputs 5V power through the DC5V port. At the same time, it monitors the DC5V port voltage through the VOUT-SNS pin and adjusts the output through the FB pin to improve the stability of the DC5V port voltage.

[0031] Capacitors C12, C11, C9, C10, and C13 are connected in series between the DC5V port and ground to improve the stability of the DC5V port output voltage.

[0032] like Figure 5 and Figure 6As shown, the load circuit includes several LEDs, and the constant current drive circuit includes a second driver chip U3. The second driver chip U3 includes several LED pins, and LEDs connected in reverse are connected in series between the LED pins and the DC 5V port. When the output voltage of the LED pin is high, the corresponding connected LED is off; when the output voltage of the LED pin is low, the corresponding connected LED is on.

[0033] Constant current control is achieved by stabilizing the voltage output from the LED pins and fixing the voltage difference across the LED. A filter capacitor C is connected in series between each LED pin and ground to improve the stability of the LED pin output voltage. In one embodiment of this application, when the capacitance of capacitor C is 4V and the voltage at the LED pin is normally 1V, the LED is in a state of just being off. By controlling the voltage output from the LED pin to decrease, the current through the LED is controlled, thus facilitating the control of the LED's brightness range.

[0034] like Figure 4 As shown, the control circuit includes a control chip U1. A DC5V port is connected to the control chip U1 to supply power. Pins 10 and 11 of the control chip U1 are connected to the SWD-CLK and SWD-DIO ports, respectively, to receive control signals from the LEDs (load). Pins 6 and 7 of the control chip U1 are connected to the TX and RX pins of the second driver chip U3, respectively. The control chip U1 converts the control signals into data packets and transmits them to the second driver chip U3. The second driver chip U3 adjusts the voltage on each LED pin individually based on the data packets, thus achieving individual control of several LEDs.

[0035] The control chip U1 and the second driver chip U3 are connected via a CAN bus. The CAN bus can transmit data packets, enabling the operation of LEDs in the load circuit in large batches and individually, so that the circuit presents smooth and complex animation effects.

[0036] The embodiments of this utility model have been described in detail above, but the content described is only a preferred embodiment of this utility model and should not be considered as limiting the scope of implementation of this utility model. All equivalent changes and improvements made within the scope of this utility model should still fall within the scope of this patent.

Claims

1. A multi-lane packet control circuit, characterized by, The power supply circuit and the load circuit are connected in series, and the constant voltage drive circuit and the constant current drive circuit are connected in series between the power supply circuit and the load circuit. The control circuit is connected with the constant current drive circuit through the CAN bus to control the operation of the LED lamps in the load circuit and present smooth animation effect. The constant voltage drive circuit includes the first drive chip U2, and the PVIN pin of the first drive chip U2 is connected with the VBAT-VIN port. The BST pin of the first drive chip U2 is connected with the DC5V port in series with the capacitor C14, the resistor R5 and the inductor L1 in sequence. The SW pin of the first drive chip U2 is connected with the input end of the inductor L1, the VOUT-SNS pin of the first drive chip U2 is connected with the output end of the inductor L1, and the FB pin of the first drive chip U2 is connected with the output end of the inductor L1 in series with the resistor R6. The constant current drive circuit includes the second drive chip U3, and the second drive chip U3 includes a plurality of LED pins outputting direct current.

2. A multi-channel packet control circuit according to claim 1, wherein, The load circuit includes a plurality of LED lamps, the LED pins of the second drive chip U3 are connected with the DC5V port in series with the reverse LED lamps, and the connection current and the brightness of the LED lamps are controlled according to the voltage outputted by the LED pins.

3. A multi-channel packet control circuit according to claim 1, wherein, The power supply circuit includes the POWER+ port outputting electric energy, and the POWER+ port is connected with the VBAT-VIN port in series with the forward diode D1.

4. A multi-channel packet control circuit according to claim 1, wherein, The control circuit includes the control chip U1, and the 10 pin and the 11 pin of the control chip U1 are connected with the SWD-CLK port and the SWD-DIO port respectively to receive the load control signal. The DC5V port is connected with the ground in series with the capacitor C12, the capacitor C11, the capacitor C9, the capacitor C10 and the capacitor C13. The LED pins of the second drive chip U3 are connected with the ground in series with the capacitor to improve the stability of the LED lamp control.

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