CN111148318A

CN111148318A - Heavy-current driving LED control circuit

Info

Publication number: CN111148318A
Application number: CN201811202152.4A
Authority: CN
Inventors: 朱勤辉; 张�林; 赵星
Original assignee: Jiangsu Wanbang Microelectronics Co ltd
Current assignee: Jiangsu Wanbang Microelectronics Co ltd
Priority date: 2018-10-16
Filing date: 2018-10-16
Publication date: 2020-05-12

Abstract

The invention particularly relates to a high-current driving LED control circuit which comprises a power supply processing circuit, a controller, an SEPIC converter, a pulse constant-current driving module group, an LED load group, a temperature sensor, a light intensity sensor and a temperature sensor. An external input voltage input power supply processing circuit; the power supply processing circuit provides power. SEPIC converter: the SEPIC converter is connected with the controller; the SEPIC converter output voltage is connected to both ends of the LED module group. The constant current driving module group comprises at least two groups of constant current driving modules; and the constant current driving modules in the constant current driving module group are all connected with the controller. Each constant current driving module is connected with a group of LED loads and is responsible for collecting the current of each group of LED terminals; the LED loads are connected in series; the relationship between the LED loads of each group is parallel connection. The control circuit is simple in structure and high in practicability.

Description

Heavy-current driving LED control circuit

Technical Field

The invention relates to the field of electronics, in particular to a high-current driving LED control circuit.

Background

LEDs have been obtained in a wide variety of fields with a series of advantages including small size, all solid state, long life, environmental protection, and power saving

The method is widely applied and becomes one of the most promising high-tech fields in the 21 st century. Numerous countries such as the United states, European Union, Japan, etc

The plan of leaving the platform is to invest huge amounts of capital to accelerate the development of the platform so as to occupy the high point of the energy strategy. The high-power LED lamp has large current, and the usability of the LED is reduced.

Disclosure of Invention

1. The technical problem to be solved is as follows:

the invention aims to overcome the defects in the prior art and provide a high-current constant-current ultraviolet control circuit which can reduce the current loss, simplify the design of a drive circuit and save the cost.

2. The technical scheme is as follows:

a kind of heavy current drives the LED control circuit, characterized by that: the LED constant current driving circuit comprises a power supply processing circuit, a controller, an SEPIC converter, a pulse constant current driving module group, an LED load group, a temperature sensor, a light intensity sensor and a temperature sensor.

An external input voltage input power supply processing circuit; the power supply processing circuit provides power. SEPIC converter: the SEPIC converter is connected with the controller; the SEPIC converter output voltage is connected to both ends of the LED module group. The constant current driving module group comprises at least two groups of constant current driving modules; and the constant current driving modules in the constant current driving module group are all connected with the controller. Each constant current driving module is connected with a group of LED loads and is responsible for collecting the current of each group of LED terminals; the LED loads are connected in series; the relationship between the LED loads of each group is parallel connection.

The light intensity sensor and the temperature sensor collect corresponding light intensity signals and temperature signals of the LED lamp and transmit the light intensity signals and the temperature signals to the controller.

Furthermore, the controller also comprises an overcurrent protection circuit, and the overcurrent protection circuit is connected with the controller.

Further, the controller is a DSP, and the model is 7FMS320F 28035.

3. Has the advantages that:

the control circuit is simple in structure and high in practicability. Besides the basic function of the control circuit, the LED lamp can be correspondingly operated by collecting the light intensity and the temperature of the high-power LED light.

Drawings

FIG. 1 is a general block diagram of the present invention;

fig. 2 is a schematic diagram of a SEPIC converter according to the invention.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings.

As shown in fig. 1, a high-current driving LED control circuit is characterized in that: the LED constant current driving circuit comprises a power supply processing circuit, a controller, an SEPIC converter, a pulse constant current driving module group, an LED load group, a temperature sensor, a light intensity sensor and a temperature sensor.

Further, the controller is a DSP, and the model is 7FMS320F 28035.

The schematic diagram of the SEPIC converter is shown in fig. 2. The Sepic converter uses a switch and an energy storage element to effectively convert energy from one form to another. The LED driving circuit can boost and buck output voltage, has the same polarity, can be applied to various illumination occasions, and is an important component of the LED driving circuit.

The constant current driving circuit includes a gate driving part and a pulse current sampling part. Common in practical use are: the grid driving part amplifies two paths of PWM signals output by the controller based on a UCC27324 chip to realize rapid on and off of two paths of LED loads. . LEDKL and LEDK2 are LED loads combined in a mutually independent series connection mode respectively, the two loads are mutually independent and do not influence each other, and the independent loads are hung on the same direct current bus. In order to prevent the LED from being burnt out due to the overlarge voltage of the direct current bus, the SEPIC output voltage needs to be protected. The current sampling part plays an important role in the control precision of the current, the sampled current signal is a digital signal rather than an analog signal, in order to ensure the undistorted amplification of the signal, the selected operational amplifier must have a large bandwidth, a low voltage offset rate and a bias current, an integrated operational amplifier TLV272 is selected for the purpose, the input offset voltage is low to O.5 mV, the input bias current is lpA, the input offset voltage has a wide input voltage range and a high temperature drift coefficient, and two paths of PWM signals can be amplified simultaneously.

Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A kind of heavy current drives the LED control circuit, characterized by that: the LED constant current driving circuit comprises a power supply processing circuit, a controller, an SEPIC converter, a pulse constant current driving module group, an LED load group, a temperature sensor, a light intensity sensor and a temperature sensor;

an external input voltage input power supply processing circuit; the power supply processing circuit provides electric energy;

SEPIC converter: the SEPIC converter is connected with the controller; the output voltage of the SEPIC converter is connected to two ends of the LED module group;

the constant current driving module group comprises at least two groups of constant current driving modules; the constant current driving modules in the constant current driving module group are connected with the controller; each constant current driving module is connected with a group of LED loads and is responsible for collecting the current of each group of LED terminals; the LED loads are connected in series; the LED loads of all groups are connected in parallel;

2. A high current driven LED control circuit as claimed in claim 1, wherein: the controller also comprises an overcurrent protection circuit, and the overcurrent protection circuit is connected with the controller.

3. A high current driven LED control circuit as claimed in claim 1, wherein: the controller is a DSP, and the model is 7FMS320F 28035.