Multi-string LED driving device based on one-path constant current output
By using a multi-string LED driver with a single constant current output, and utilizing an LDO module, an MCU module, and a DC-DC constant current drive module, combined with a multi-string LED load of transistors, the problems of uneven LED brightness and fault detection are solved. The functions of current balancing and fault reporting are realized, and the driving cost is reduced.
Patent Information
- Application Number
- CN202423235902.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-26
- Publication Date
- 2025-12-19
- Estimated Expiration
- 2034-12-26
AI Technical Summary
In existing technologies, LEDs connected in series and parallel have uneven brightness and cannot be fault detected and reported. This is especially true when the number and model of each branch of the LED load are different, which makes it impossible to detect the failure and open circuit of a single LED.
The system employs a multi-string LED driver based on a single constant current output, comprising an LDO module, an MCU module, a DC-DC constant current drive module, and a multi-string LED load consisting of transistors. Current balancing is achieved through current-sharing transistors and resistors, and voltage feedback is reported in case of a fault.
It achieves brightness uniformity among multiple LED strings, and can detect and report faults when a single LED fails, saving driving costs.
Smart Images
Figure CN223694031U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to LED drive technical field, especially a kind of multi-group string LED drive device based on one-way constant current output. BACKGROUND
[0002] The commonly used in market at present is through one-way constant current to build the net-like LED group scheme of simple series-parallel connection,
[0003] When the number of LED series and parallel is more, the number of LED load branches is different, the model of LED load parallel branch is different and so on, the current of each branch becomes a big problem, which causes the uneven brightness between LEDs, and more importantly, single LED open circuit failure cannot be detected and reported.
[0004] Therefore, it is necessary to provide a kind of multi-group string LED drive device based on one-way constant current output. INVENTION CONTENTS
[0005] The utility model aims at providing a kind of multi-group string LED drive device based on one-way constant current output, to solve the problems of uneven brightness between LEDs and unable to carry out fault detection reporting in prior art.
[0006] The utility model embodiment provides a kind of multi-group string LED drive device based on one-way constant current output, the LED drive device includes LDO module, MCU module, DC-DC constant current drive module and the multi-group string LED load based on triode;The input end of the LDO module is externally connected with the output end of vehicle body controller, the output end of the LDO module is electrically connected with the first input end of the MCU module, the first output end of the MCU module is electrically connected with the first input end of the DC-DC constant current drive module, the output end of vehicle body controller is electrically connected with the second input end of the DC-DC constant current drive module, the first output end of the DC-DC constant current drive module is connected with the input end of the multi-group string LED load based on triode, the output end of the multi-group string LED load based on triode is electrically connected with the third input end of the DC-DC constant current drive module, the second output end of the DC-DC constant current drive module is electrically connected with the second input end of the MCU module, the second output end of the MCU module is electrically connected with the input end of the vehicle body controller, at least two parallel LED load branches, current-sharing triode same as the number of LED load branches, current-sharing resistance connected with the emitter end of the current-sharing triode and triode amplification circuit are integrated in the multi-group string LED load based on triode, the output end of the triode amplification circuit is respectively connected with the base of the current-sharing triode, and the DC-DC constant current drive module is used to drive the multi-group string LED load based on triode constant current work.
[0007] Further, the vehicle body controller is used to power the MCU module and the DC-DC constant current driving module.
[0008] Further, the LDO module is integrated with a linear voltage regulator, which is used to stabilize the voltage input by the vehicle body controller to 5V to power the MCU module.
[0009] Further, the chip model in the MCU module is FS32K144, which is used to enable the DC-DC constant current driving module to output a constant current to the multiple groups of LED loads based on triodes.
[0010] Further, the triode amplification circuit includes a fourth triode Q4, a fourth resistor R4, a fifth resistor R5, a first diode D1, and a fourth capacitor C4. The fourth resistor R4 and the fifth resistor R5 are connected in parallel to the emitter of the fourth triode Q4. The base of the fourth triode Q4 is connected to the cathode of the first diode D1. The fourth capacitor is connected in parallel to the first diode D1. The base of the fourth triode Q4 is also connected to the sixth resistor R6, the seventh resistor R7, and the eighth resistor R8 connected in parallel.
[0011] Further, the multiple groups of LED loads based on triodes include three parallel LED load branches, a first triode Q1, a second triode Q2, a third triode Q3, a first current-sharing resistor R1, a second current-sharing resistor R2, a third current-sharing resistor R3, and a fourth resistor R4. The collector of the first triode Q1 is connected to the first LED load branch. The emitter of the first triode Q1 is connected to one end of the first current-sharing resistor R1. The collector of the second triode Q2 is connected to the second LED load branch. The emitter of the second triode Q2 is connected to one end of the second current-sharing resistor R2. The collector of the third triode Q3 is connected to the third LED load branch. The emitter of the third triode Q3 is connected to one end of the third current-sharing resistor R3. The other ends of the current-sharing resistors R1, R2, and R3 are connected to one end of the fourth resistor R4. The other end of the fourth resistor R4 is grounded. The collectors of the fourth triode Q4 are connected to the bases of the first triode Q1, the second triode Q2, and the third triode Q3, respectively.
[0012] Further, the fourth triode Q4 is a PNP triode.
[0013] Further, the current-sharing triodes with the same number of LED load branches are NPN triodes.
[0014] Further, the multiple groups of LED loads based on triodes also include a connector J1, which is used to connect the positive and negative poles of the channel output.
[0015] Further, the triode-based multi-group string LED load is also used for fault feedback based on the voltage across the LED load.
[0016] The technical scheme provided by the embodiment of the utility model has the beneficial effects that: the application provides a multi-group string LED driving device based on one constant current output.
[0017] (1) Single-channel constant current output can drive multiple groups of string LEDs, making the brightness of each group of string LEDs uniform and saving driving cost.
[0018] (2) More functions are realized under limited driving conditions, including the function of fault detection and reporting when a single LED fails in open circuit. BRIEF DESCRIPTION OF DRAWINGS
[0019] In order to more clearly illustrate the technical scheme in the embodiment of the utility model, the drawings needed in the embodiment description will be briefly introduced as follows, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creative labor.
[0020] Figure 1 is a multi-group string LED driving device structure schematic diagram based on one constant current output provided by the embodiment of the utility model.
[0021] Figure 2 is a multi-group string LED load topology diagram based on a triode provided by the embodiment of the utility model. DETAILED DESCRIPTION
[0022] In order to make the purpose, technical scheme and advantages of the utility model more clear, the embodiment of the utility model will be further described in detail below in combination with the drawings.
[0023] 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 the utility model belongs; the terms used in the specification are only for the purpose of describing specific embodiments and are not intended to limit the utility model, for example, the terms "length", "width", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", "upper end", "lower end", "middle" and the like indicate the orientation or position based on the orientation or position shown in the drawings, and are only for the convenience of description, and cannot be understood as a limitation on the technical scheme.
[0024] The terms "comprise", "comprising", "have", "having", "include", "including", "contain", "containing", "provide", "providing", "offer", "offering", "characterized by", "characterized in that", "characterized in", "characterized as", "characterized by that", "characterized by in", "characterized as by", "characterized in that by", "characterized in that by in", "characterized in that by", "characterized in that by in that", "characterized in that by in that by", "characterized in that by in that by in" and any variations thereof in the claims and the description of the present application, shall not be construed as excluding additional components or steps.
[0025] Furthermore, reference being made herein to "embodiments" means that certain features, structures or characteristics described in connection with an embodiment can be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor does it necessarily refer to a separate or alternative embodiment, in isolation or in any combination. It is expressly understood that the embodiments described herein can be combined with each other.
[0026] Embodiment: For the sake of subsequent understanding, the overall inventive concept of the present application is described here: The present application provides a multi-group string LED driving device based on one-way constant current output, aiming to realize the effect of driving multi-group string LED load with one-way constant current output, and at the same time meet the effect of fault detection reporting. On the basis of saving driving cost, this scheme realizes multi-group string LED load driving and meets the demand of single LED failure and fault reporting, especially in the application scenario where the front turn signal LED load is more and the fault feedback is a necessary condition. This scheme mainly includes four parts, including LDO module, MCU module, constant current driving output module and multi-group string LED load module based on triode. The input power supplies 5V to the MCU through the LDO, at the same time, supplies power to the DC-DC constant current driving, and the MCU enables the DC-DC chip to output one-way constant current to the LED load. One-way constant current is divided into three parts to the LED string load. When the circuit is working normally, the triode works in the amplification state, and at the same time, the current of the LED string is set through each resistance value below the triodes Q1, Q2 and Q3, so as to achieve the effect of stable LED working current. When one LED in any string of LED fails and opens, the voltage across the whole LED load will rise to the overvoltage protection state, so as to achieve the effect of reporting the fault.
[0027] The specific implementation is as follows:
[0028] As Figures 1-2 shown is a multi-group string LED driving device structure schematic diagram based on one-way constant current output provided by the embodiment of the present application.
[0029] As an example, the LED driving device includes LDO module 1, MCU module 2, DC-DC constant current driving module 3 and multi-group string LED load 4 based on triode;
[0030] The input end of the LDO module 1 is connected with the output end of the body controller BCM, the output end of the LDO module 1 is electrically connected with the first input end of the MCU module 2, the first output end of the MCU module 2 is electrically connected with the first input end of the DC-DC constant current driving module 3, the output end of the body controller BCM is electrically connected with the second input end of the DC-DC constant current driving module 3, the first output end of the DC-DC constant current driving module 3 is connected with the input end of the multiple groups of LED load based on triode 4, the output end of the multiple groups of LED load based on triode 4 is electrically connected with the third input end of the DC-DC constant current driving module 3, the second output end of the DC-DC constant current driving module 3 is electrically connected with the second input end of the MCU module 2, the second output end of the MCU module 2 is electrically connected with the input end of the body controller BCM, the multiple groups of LED load based on triode 4 is integrated with at least two parallel LED load branches, the same number of current-sharing triodes as the LED load branches, current-sharing resistors connected with the emitter ends of the current-sharing triodes, and triode amplification circuits, the output ends of the triode amplification circuits are respectively connected with the base ends of the current-sharing triodes, and the DC-DC constant current driving module 3 is used for driving the multiple groups of LED load based on triode 4 to work in constant current.
[0031] In some possible implementation manners, the body controller BCM is used for supplying power to the MCU module 2 and the DC-DC constant current driving module 3. Specifically, the input end supplies power to the MCU module 2 through the LDO module 1 to output 5V, and supplies power to the DC-DC constant current driving module 3 at the same time. The LDO module 1 is integrated with a linear voltage stabilizer, which is used for stabilizing the voltage input by the body controller BCM to 5V to supply power to the MCU module 2. The chip type of the MCU module 2 is FS32K144, which is used for enabling the DC-DC constant current driving module 3 to output a constant current to the multiple groups of LED load based on triode 4. The type of the DC-DC constant current driving module 3 is TLD6098. It should be noted that the types of the above modules are not limited, and specifically, a person skilled in the art can change the types to meet actual needs in actual use.
[0032] In some possible implementation manners, the body controller BCM is used for supplying power to the MCU module 2 and the DC-DC constant current driving module 3. Specifically, the input end supplies power to the MCU module 2 through the LDO module 1 to output 5V, and supplies power to the DC-DC constant current driving module 3 at the same time. The LDO module 1 is integrated with a linear voltage stabilizer, which is used for stabilizing the voltage input by the body controller BCM to 5V to supply power to the MCU module 2. The chip type of the MCU module 2 is FS32K144, which is used for enabling the DC-DC constant current driving module 3 to output a constant current to the multiple groups of LED load based on triode 4. The type of the DC-DC constant current driving module 3 is TLD6098. It should be noted that the types of the above modules are not limited, and specifically, a person skilled in the art can change the types to meet actual needs in actual use. Figure 2As shown, three LED load branches are taken as an example for illustration. The transistor amplification circuit comprises a fourth transistor Q4, a fourth resistor R4, a fifth resistor R5, a first diode D1 and a fourth capacitor C4, the fourth resistor R4 and the fifth resistor R5 are connected in parallel and then connected to the emitter of the fourth transistor Q4, the base of the fourth transistor Q4 is connected to the cathode of the first diode D1, the fourth capacitor is connected in parallel with the first diode D1, and the base of the fourth transistor Q4 is also connected to the sixth resistor R6, the seventh resistor R7 and the eighth resistor R8 connected in parallel. The transistor-based multi-group series LED load comprises three parallel LED load branches, a first transistor Q1, a second transistor Q2, a third transistor Q3, a first current-sharing resistor R1, a second current-sharing resistor R2, a third current-sharing resistor R3 and a fourth resistor R4, the collector of the first transistor Q1 is connected to the first LED load branch, the emitter of the first transistor Q1 is connected to one end of the first current-sharing resistor R1, the collector of the second transistor Q2 is connected to the second LED load branch, the emitter of the second transistor Q2 is connected to one end of the second current-sharing resistor R2, the collector of the third transistor Q3 is connected to the third LED load branch, the emitter of the third transistor Q3 is connected to one end of the third current-sharing resistor R3, the other ends of the current-sharing resistors R1, R2 and R3 are connected to one end of the fourth resistor R4, the other end of the fourth resistor R4 is grounded, and the collector of the fourth transistor Q4 is connected to the bases of the first transistor Q1, the second transistor Q2 and the third transistor Q3 respectively. The fourth transistor Q4 is a PNP-type transistor. The current-sharing transistors with the same number of LED load branches are NPN-type transistors. The transistor-based multi-group series LED load further comprises a connector J1, which is used to connect the positive and negative poles of the channel output. Specifically, the constant current output by the DC-DC constant current driving module 3 is input into the LED load through the No. 1 pin of the connector J1, and is equally divided into three LED load branches through the current-sharing of the transistor Q4, so as to ensure the current balance in the LED load of different branches. The current-sharing is further ensured through the transistors Q1-Q3 and the current-sharing resistors R1-R3 connected thereto. It should be noted that the number of LED load branches in the transistor-based multi-group series LED load is not limited here, and when the number of LED load branches increases, the number of current-sharing resistors and transistors can be increased synchronously, and the principle is the same, which will not be described here.
[0033] In some possible embodiments, the triode-based multi-group string LED load 4 is also used for fault feedback based on the voltage across the LED load. Specifically, when one LED in any string of LEDs is open-circuit failure, the voltage across the entire LED load will rise sharply to an overvoltage protection state, thereby achieving the effect of reporting the fault. Specifically, the fault signal can be uploaded to the body controller BCM by the MCU module 2.
[0034] Working principle:
[0035] The scheme mainly includes four parts, including the LDO module 1, the MCU module 2, the DC-DC constant current driving module 3, and the triode-based multi-group string LED load module 4. The input power supply outputs 5V to the MCU module 2 for power supply at the same time as power supply to the DC-DC constant current driving module 3, and the MCU module 2 enables the DC-DC constant current driving module 3 to output a constant current to the triode-based multi-group string LED load 4. One constant current is divided by three to the LED string load. When the circuit is working normally, the triode works in an amplification state, and the current of the LED string is set through each resistor value below the triode, thereby achieving the effect of stable LED working current. When one LED in any string of LEDs is open-circuit failure, the voltage across the entire LED load will rise sharply to an overvoltage protection state, thereby achieving the effect of reporting the fault.
[0036] In the above embodiments, the multi-group string LED driving scheme is an entire string of LEDs, the number of which is large, and only one constant current driving output control is required, and the brightness unevenness of the mesh structure will not occur. The present scheme can meet the demand of fault detection reporting in the case of single LED open-circuit failure, which is superior to the mesh structure that cannot report faults, and is more cost-effective in driving.
[0037] The above describes only the preferred specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any skilled person in the art can make equivalent substitutions or changes to the technical solutions and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.
Claims
1. A multi-group string LED driving device based on a constant current output, characterized in that, The LED driving device comprises an LDO module, an MCU module, a DC-DC constant current driving module and a triode-based multi-group string LED load. The input end of the LDO module is externally connected with the output end of a vehicle body controller, the output end of the LDO module is electrically connected with the first input end of the MCU module, the first output end of the MCU module is electrically connected with the first input end of the DC-DC constant current driving module, the output end of the vehicle body controller is electrically connected with the second input end of the DC-DC constant current driving module, the first output end of the DC-DC constant current driving module is connected with the input end of the triode-based multi-group string LED load, the output end of the triode-based multi-group string LED load is electrically connected with the third input end of the DC-DC constant current driving module, the second output end of the DC-DC constant current driving module is electrically connected with the second input end of the MCU module, the second output end of the MCU module is electrically connected with the input end of the vehicle body controller, at least two parallel LED load branches, current-sharing triodes with the same number as the LED load branches, current-sharing resistors connected with the emitter ends of the current-sharing triodes and a triode amplification circuit are integrated in the triode-based multi-group string LED load, the output ends of the triode amplification circuit are respectively connected with the base ends of the current-sharing triodes, and the DC-DC constant current driving module is used for driving the triode-based multi-group string LED load to work in constant current.
2. The multi-group string LED driving device based on one constant current output according to claim 1, wherein, The vehicle body controller is used for supplying power to the MCU module and the DC-DC constant current driving module.
3. The multi-group string LED driving device based on one constant current output of claim 1, wherein, A linear voltage stabilizer is integrated in the LDO module, which is used for stabilizing the voltage input by the vehicle body controller to 5V to supply power to the MCU module.
4. The multi-group string LED driving device based on one constant current output of claim 1, wherein, The chip type of the MCU module is FS32K144, which is used for enabling the DC-DC constant current driving module to output a constant current to the triode-based multi-group string LED load.
5. The multi-group string LED driving device based on one constant current output of claim 1, wherein, The triode amplification circuit comprises a fourth triode Q4, a fourth resistor R4, a fifth resistor R5, a first diode D1 and a fourth capacitor C4, the fourth resistor R4 and the fifth resistor R5 are connected in parallel and connected to the emitter of the fourth triode Q4, the base of the fourth triode Q4 is connected with the cathode of the first diode D1, the fourth capacitor is connected in parallel with the first diode D1, and the base of the fourth triode Q4 is also connected with the sixth resistor R6, the seventh resistor R7 and the eighth resistor R8 which are connected in parallel.
6. The multi-group string LED driving device based on one constant current output of claim 5, wherein, The triode-based multi-group string LED load includes three parallel LED load branches, a first triode Q1, a second triode Q2, a third triode Q3, a first current-sharing resistor R1, a second current-sharing resistor R2, a third current-sharing resistor R3, and a fourth resistor R4. The collector of the first triode Q1 is connected to a first LED load branch. The emitter of the first triode Q1 is connected to one end of the first current-sharing resistor R1. The collector of the second triode Q2 is connected to a second LED load branch. The emitter of the second triode Q2 is connected to one end of the second current-sharing resistor R2. The collector of the third triode Q3 is connected to a third LED load branch. The emitter of the third triode Q3 is connected to one end of the third current-sharing resistor R3. The other ends of the current-sharing resistors R1, R2, and R3 are connected to one end of the fourth resistor R4. The other end of the fourth resistor R4 is grounded. The collectors of the fourth triode Q4 are connected to the bases of the first triode Q1, the second triode Q2, and the third triode Q3, respectively.
7. The multi-group string LED driving device based on one constant current output of claim 5, wherein, The fourth triode Q4 is a PNP triode.
8. The multi-group string LED driving device based on one constant current output of claim 1, wherein, The current-sharing triodes that are the same number as the LED load branches are NPN triodes.
9. The multi-group string LED driving device based on one constant current output of claim 1, wherein, The triode-based multi-group string LED load further includes a connector J1 for connecting the positive and negative poles of the channel output.
10. The multi-group string LED driving device based on one constant current output of claim 1, wherein, The triode-based multi-group string LED load is also used for fault feedback based on the voltage across the LED load.