CN210298151U

CN210298151U - LED constant current driving system

Info

Publication number: CN210298151U
Application number: CN201921173177.6U
Authority: CN
Inventors: 李卫华; 李文俊; 黄卫国; 程亚丽; 李杰良; 周道强
Original assignee: Shenzhen Yuming Vision Technology Co ltd
Current assignee: Shenzhen Yuming Vision Technology Co ltd
Priority date: 2019-07-24
Filing date: 2019-07-24
Publication date: 2020-04-10
Anticipated expiration: 2029-07-24

Abstract

The application provides an LED constant current driving system, which comprises a current setting part, a current conversion part, a voltage merging part and a constant current part, wherein the current setting part sends a set current value to the current conversion part, the current conversion part converts the set current value into a reference voltage and sends the reference voltage to the merging part, the merging part merges the voltage value sampled by an LED and the reference voltage and outputs the voltage value to the constant current part, and the constant current part converts the voltage value into a constant current for output. In the system related to this application, different current data can be set as required to the current setting portion, and current conversion portion and voltage merging portion and constant current portion convert it into the constant current output again, can flexibly adapt to the LED drive of multiple different power, have reduced design and manufacturing cost, are convenient for install and maintain.

Description

LED constant current driving system

Technical Field

The application relates to a driving system, in particular to an LED constant current driving system.

Background

In the high-power LED constant current drive, in the prior art, LED lamps are combined in a series-parallel manner according to different powers, and then corresponding constant current drive is designed according to the current required after combination. Because the power of the LED lamp beads on the market has various specifications (namely, the current is various), the series-parallel combination forms are various to obtain the power required by the design. Corresponding drivers are designed aiming at different combinations, namely one driver corresponds to one LED lamp, and the universality is avoided. Increasing design and production costs and also inconvenience installation and maintenance, and improvements and enhancements are needed.

SUMMERY OF THE UTILITY MODEL

In view of this, an object of the present application is to provide a current-adjustable LED constant current driving system.

The application relates to an LED constant current driving system, which comprises a current setting part, a current conversion part, a voltage merging part and a constant current part, wherein the current setting part sends a set current value to the current conversion part, the current conversion part converts the set current value into a reference voltage and sends the reference voltage to the merging part, the merging part merges a voltage value sampled by an LED and the reference voltage and outputs the voltage value to the constant current part, and the constant current part converts the voltage value into a constant current for output.

In the system related to this application, different current data can be set as required to the current setting portion, and current conversion portion and voltage merging portion and constant current portion convert it into the constant current output again, can flexibly adapt to the LED drive of multiple different power, have reduced design and manufacturing cost, are convenient for install and maintain.

In addition, in the system according to the present application, optionally, the current setting section transmits the set current value to the current converting section by RS485 communication.

In addition, in the system according to the present application, optionally, the current conversion unit includes a single chip microcomputer and a DAC, the single chip microcomputer converts the set current value into PWM and outputs the PWM to the DAC, and the DAC converts the PWM to the reference voltage.

In addition, in the system according to the present application, optionally, the constant current section includes a DC-DC constant current chip that converts the voltage value into a constant current output.

In addition, in the system that this application relates to, optionally, control division still includes temperature sensor, and temperature sensor transmits the temperature sensing signal who detects to detection division, and detection division feeds back the temperature value to host computer through control division according to temperature sensing signal.

In addition, the system according to the present application may further include an LED sampling unit that sends the voltage sampled by the LED to the combining unit.

Drawings

Fig. 1 shows a schematic structural diagram of an LED constant current driving system according to an embodiment of the present application;

FIG. 2 is a schematic diagram of a circuit for receiving a set current value by RS485 according to an embodiment of the present application;

fig. 3 shows a schematic circuit diagram of a circuit for receiving a current value and converting the current value to a PWM output by a single chip according to an embodiment of the present application;

FIG. 4 is a schematic diagram of a PWM DAC conversion circuit according to an embodiment of the present invention;

fig. 5 shows a schematic circuit diagram of a constant current chip according to an embodiment of the present application.

Detailed Description

Hereinafter, preferred embodiments of the present application will be described in detail with reference to the accompanying drawings. In the following description, the same components are denoted by the same reference numerals, and redundant description thereof is omitted. In addition, the drawings are only schematic drawings, and the ratio of the sizes of the components to each other or the shapes of the components may be different from actual ones.

The LED constant current driving system related to the specific embodiment of the application is not only suitable for the constant current of the LED, but also can be used for other driving control, such as chemical engineering, metallurgy and the like.

Fig. 1 shows a schematic structural diagram of an LED constant current driving system according to an embodiment of the present application. As shown in fig. 1, the LED constant current driving system according to the embodiment of the present application includes a current setting unit, a current converting unit, a voltage combining unit, a sampling unit, and a constant current unit.

The current setting portion may be implemented as a software operating interface on the controller, and the user or manufacturer may input the desired current value, which may range from 0-100, as shown in table 1.

Table 1 set current value example

Input voltage (V)	Setting a current value	Output voltage	Output current (A)
				24	10	4 strings of	0.12
24	12	4 strings of	0.15
				24	14	4 strings of	0.17
24	16	4 strings of	0.2
				24	18	4 strings of	0.22
24	20	4 strings of	0.24
				24	22	4 strings of	0.27
24	24	4 strings of	0.28
				24	26	4 strings of	0.29
.	.	.	.
				24	76	4 strings of	0.92
24	78	4 strings of	0.94
				24	80	4 strings of	0.97
24	82	4 strings of	0.99
				24	84	4 strings of	1.01
24	86	4 strings of	1.01
				24	88	4 strings of	1.01
24	90	4 strings of	1.01
				24	92	4 strings of	1.01
24	94	4 strings of	1.01
				24	96	4 strings of	1.01
24	98	4 strings of	1.01
				24	100	4 strings of	1.01

The set current value is transmitted to the current conversion part through RS485 communication.

The current conversion part further comprises a singlechip and a DAC. The singlechip receives the set current value and converts the set current value into corresponding PWM data. Fig. 2 shows a schematic diagram of a circuit for receiving a set current value by RS485 according to an embodiment of the present application. Fig. 3 shows a schematic circuit diagram of a circuit for receiving a current value and converting the current value to a PWM output by the single chip according to the embodiment of the present application. The DAC converts PWM data output by the singlechip into reference voltage and sends the reference voltage to the merging part. Fig. 4 shows a schematic circuit diagram of a PWM DAC conversion according to an embodiment of the present invention.

The sampling part samples the voltage of the serial-parallel combined LED lamp through the sampling resistor and sends the sampled voltage to the merging part.

The combining unit combines the reference voltage and the sampling voltage and outputs a voltage value to the constant current unit.

The constant current part comprises a DC-DC constant current chip and performs constant current output according to the voltage value. Fig. 5 shows a schematic circuit diagram of a constant current chip according to an embodiment of the present application. This is a unit constant current core circuit, which adjusts Vcs, i.e., the value of the current of the lamp through R24R25, by adjusting VREF.

Generally, the power of a single-bead LED is 0.1W-2W, but the driving system according to the embodiment can be applied to a high-power lamp formed by combining a plurality of beads in series and in parallel, and the power ranges from a few watts to hundreds of watts.

In the prior art, the required constant current value is achieved by modifying the sampling resistor according to different powers and different lamp bead combination modes, so that the type is various, and troubles are brought to production management. The LED constant current driving system can adapt to various lamps in one model by setting different current values, improves the adaptability and the cost performance, and reduces the production cost and the management cost.

The foregoing is merely a preferred embodiment of the present application and further details of the present application are set forth in the detailed description of the preferred embodiments and the detailed description is not intended to limit the present application to the particular embodiments described herein. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. The LED constant-current driving system is characterized by comprising a current setting part, a current converting part, a voltage merging part and a constant-current part, wherein the current setting part sends a set current value to the current converting part, the current converting part converts the set current value into a reference voltage and sends the reference voltage to the merging part, the merging part merges a voltage value sampled by an LED and the reference voltage and outputs the voltage value to the constant-current part, and the constant-current part converts the voltage value into a constant current to be output.

2. The system of claim 1, wherein the current setting section transmits the set current value to the current converting section through RS485 communication.

3. The system according to claim 1, wherein the current conversion section includes a single chip microcomputer and a DAC, the single chip microcomputer converts the set current value into PWM to output to the DAC, and the DAC converts into the reference voltage.

4. The system of claim 1, wherein the constant current portion comprises a DC-DC constant current chip that converts the voltage value to a constant current output.

5. The system according to any one of claims 1 to 4, further comprising an LED sampling section for transmitting the LED sampled voltage to the combining section.