A circuit that realizes different topologies through different patch methods

Abstract

The present invention discloses a circuit that realizes different topological structures by different patch methods, belonging to the field of integrated control technology for automobile lights. It includes an anti-reverse filter circuit, a π-type filter circuit, a topology switching circuit, a sampling circuit, an overvoltage protection circuit and an IC circuit. The present invention is mainly reflected in the design of the placement of resistors in the topology switching circuit. By using different patch methods for resistors, the requirements for the voltage range in the actual circuit are realized, which effectively reduces the difficulty of the design process and avoids the need to always consider different voltages required by different numbers of LEDs during the design process. Different hardware circuits are designed, which greatly reduces manpower and financial resources and improves work efficiency. It can be seen that the present invention has a better improvement over traditional circuit design methods, simplifies the circuit structure, and has better practicality.

Description

Technical Field

[0001] The present invention belongs to the technical field of integrated control of automobile lights, and in particular to a circuit that realizes different topological structures by using different patch methods. Background Art

[0002] As LED light source technology is increasingly used in automotive lighting, different automotive lights require different numbers of LEDs. Circuit design methods are based on the voltage range required by the LEDs in the circuit. Several different voltage ranges require the design of several different hardware circuits, using cumbersome resistor voltage division methods, etc. This not only increases the design cost of the circuit board, but is also time-consuming. Summary of the Invention

[0003] To solve the above problems, the present invention provides a circuit that realizes different topological structures through different patch methods. The voltage value required by the LED in the circuit is achieved by patching the resistor in different ways. Compared with the traditional hardware circuit connection method, it has a greater cost reduction advantage, simplifies the circuit structure, saves manpower and financial resources, and has good practicality.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A circuit that implements different topological structures through different patch methods includes an anti-reverse filtering circuit, a π-type filtering circuit, a topology switching circuit, a sampling circuit, an overvoltage protection circuit, and an IC circuit. The topology switching circuit includes n LEDs and any two resistors from first to fourth resistors R1-R4. The n LEDs are connected in series to form an LED string, the anode of the LED string is connected to one end of the first resistor R1, the anode of the LED string is connected to a positive power supply voltage LED+, the cathode of the LED string is connected to one end of a third resistor R3 and one end of a fourth resistor R4, the cathode of the LED string is connected to a negative power supply voltage LED-, the other end of the first resistor R1 is connected to one end of the second resistor R2, the other end of the third resistor R3 is connected to the other end of the second resistor R2, and the other end of the fourth resistor R4 is grounded GND.

[0006] Using the above technical solution, the topology switching circuit switches between the Boost circuit, the Buck circuit, and the Buck-Boost circuit; using a fixed power supply voltage, selecting the resistor placement position, and determining different topologies through different patch methods to achieve different voltage values ​​required by the LED in the circuit; the above technical solution only changes the structure of the topology switching circuit, and the structures of other anti-reverse filtering circuits, π-type filtering circuits, sampling circuits, overvoltage protection circuits, and IC circuits remain fixed.

[0007] Furthermore, the input end of the topology switching circuit is connected to the π-type filter circuit, and the π-type filter circuit is connected to the anti-reverse filter circuit.

[0008] By adopting the above technical solution, the anti-reverse filter circuit and the π-type filter circuit play the role of suppressing voltage fluctuations so that the circuit obtains a smooth and stable voltage.

[0009] Furthermore, the output end of the topology switching circuit is connected to the sampling circuit and the IC circuit respectively, and the sampling circuit and the IC circuit are connected to the overvoltage protection circuit respectively.

[0010] Using the above technical solution, the topology type to be used is determined by comparing the load voltage with the input voltage range at the initial stage of application, and the corresponding project requirements are finally achieved by combining resistor patches at key positions.

[0011] Beneficial effects:

[0012] The present invention is mainly reflected in the design of the resistor placement position in the topology switching circuit. By using different resistor patch methods to meet the voltage range requirements in the actual circuit, the difficulty of the design process is effectively reduced, and it is avoided that different hardware circuits need to be designed considering different numbers of LEDs requiring different voltages during the design process. This greatly reduces manpower and financial resources and improves work efficiency. It can be seen that the present invention has a significant improvement over traditional circuit design methods, simplifies the circuit structure, and has good practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A block diagram of a circuit for realizing different topological structures by using different patch methods according to the present invention;

[0014] Figure 2 A circuit diagram of a topology switching circuit according to the present invention;

[0015] In the figure: 1-anti-reverse filtering circuit, 2-π type filtering circuit, 3-topology switching circuit, 4-sampling circuit, 5-overvoltage protection circuit, 6-IC circuit. DETAILED DESCRIPTION

[0016] The present invention will be further described below with reference to the accompanying drawings and examples.

[0017] The present invention proposes a circuit that realizes different topological structures by different patch methods, such as Figure 1As shown, it includes an anti-reverse filtering circuit 1, a π-type filtering circuit 2, a topology switching circuit 3, a sampling circuit 4, an overvoltage protection circuit 5 and an IC circuit 6. The input end of the topology switching circuit 3 is connected to the π-type filtering circuit 2, the π-type filtering circuit 2 is connected to the anti-reverse filtering circuit 1, the output end of the topology switching circuit 3 is connected to the sampling circuit 4 and the IC circuit 6 respectively, and the sampling circuit 4 and the IC circuit 6 are respectively connected to the overvoltage protection circuit 5.

[0018] When designing the above hardware circuit, the voltage from the power supply first passes through the anti-reverse filter circuit 1 and then through the PMOS tube for electrostatic protection. Then it passes through the π-type filter circuit 2 to filter out impurities and contamination from the circuit operation. Finally, it passes through the topology switching circuit 3 (main circuit) to realize different topological structures. During the circuit board patch process, different topological structures are directly selected by selecting different resistors.

[0019] The following combination Figure 2 , describing the preferred embodiments of the present invention.

[0020] Example 1

[0021] By mounting the second resistor R2 and the third resistor R3 on the circuit board, a boost circuit is formed. This circuit structure is used when the voltage required by the LEDs is higher than 24V when there are a large number of LEDs. The specific circuit structure is as follows:

[0022] The topology switching circuit 3 includes n LEDs, a second resistor R2, and a third resistor R3. The n LEDs are connected in series to form an LED string. The anode of the LED string is connected to the positive power supply voltage LED+, and the cathode of the LED string is connected to the negative power supply voltage LED-. The anode of the LED string is connected to one end of the second resistor R2, the cathode of the LED string is connected to one end of the third resistor R3, and the other end of the second resistor R2 is connected to the other end of the third resistor R3.

[0023] Example 2

[0024] By mounting the first resistor R1 and the third resistor R3 on the circuit board, a step-down circuit is formed. This circuit structure is used when the number of LEDs is small and the required voltage value is lower than 9V. The specific circuit structure is as follows:

[0025] The topology switching circuit 3 includes n LEDs, a first resistor R1, and a third resistor R3. The n LEDs are connected in series to form an LED string. The anode of the LED string is connected to the positive power supply voltage LED+, and the cathode of the LED string is connected to the negative power supply voltage LED-. The anode of the LED string is connected to one end of the first resistor R1, the cathode of the LED string is connected to one end of the third resistor R3, and the other end of the first resistor R1 is connected to the other end of the third resistor R3.

[0026] Example 3

[0027] A step-up / step-down circuit is formed by mounting a second resistor R2 and a fourth resistor R4 on a circuit board. This circuit structure is used when the voltage on the LED is between 9V and 24V. The specific circuit structure is as follows: the topology switching circuit 3 includes n LEDs, a second resistor R2, and a fourth resistor R4. The n LEDs are connected in series to form an LED string. The anode of the LED string is connected to the positive power supply voltage LED+, and the cathode of the LED string is connected to the negative power supply voltage LED-. The anode of the LED string is connected to one end of the second resistor R2, and the cathode of the LED string is connected to the other end of the second resistor R2 and one end of the fourth resistor R4. The other end of the fourth resistor R4 is grounded GND.

[0028] In summary, the present invention has a greater cost reduction advantage over the traditional hardware circuit connection method, simplifies the circuit structure, is clear and concise, saves manpower and financial resources, and has good practicality.

[0029] In the present invention, the anti-reverse filter circuit 1, the π-type filter circuit 2, the sampling circuit 4, the overvoltage protection circuit 5, and the IC circuit 6 are all common circuit structures on the market. The parameters of the resistors can be selected according to the voltage range requirements of the actual circuit.

[0030] Regarding the limitation of the protection scope of the present invention, those skilled in the art should understand that, based on the technical solution of the present invention, various modifications or variations that can be made by those skilled in the art without creative work are still within the protection scope of the present invention.

Claims

1. A circuit for realizing different topological structures by different patch methods, comprising an anti-reverse filter circuit (1), a π-type filter circuit (2), a topology switching circuit (3), a sampling circuit (4), an overvoltage protection circuit (5) and an IC circuit (6), characterized in that: The topology switching circuit (3) comprises n LEDs, a first resistor and a fourth resistor, or n LEDs, a first resistor and a third resistor, or n LEDs, a second resistor and a third resistor, wherein the n LEDs are connected in series to form an LED string, wherein the anode of the LED string is connected to one end of the first resistor R1, the anode of the LED string is connected to a positive power supply voltage LED+, the cathode of the LED string is connected to one end of the third resistor R3 and one end of the fourth resistor R4, the cathode of the LED string is connected to a negative power supply voltage LED-, the other end of the first resistor R1 is connected to one end of the second resistor R2, the other end of the third resistor R3 is connected to the other end of the second resistor R2, and the other end of the fourth resistor R4 is grounded GND; the input end of the topology switching circuit (3) is connected to the π-type filter circuit (2), and the π-type filter circuit (2) is connected to the anti-reverse filter circuit (1); the output end of the topology switching circuit (3) is respectively connected to the sampling circuit (4) and the IC circuit (6), and the sampling circuit (4) and the IC circuit (6) are respectively connected to the overvoltage protection circuit (5).

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