CN218735075U

CN218735075U - LED drive circuit

Info

Publication number: CN218735075U
Application number: CN202222771399.6U
Authority: CN
Inventors: 黄云帆
Original assignee: Dongguan Mingshang Biological Lighting Technology Co ltd
Current assignee: Dongguan Mingshang Biological Lighting Technology Co ltd
Priority date: 2022-10-17
Filing date: 2022-10-17
Publication date: 2023-03-24
Anticipated expiration: 2032-10-17

Abstract

The utility model provides a LED drive circuit, which comprises at least one LED power supply, wherein the LED power supply is connected with an LED; the LED driving circuit also comprises a main control circuit, wherein the main control circuit generates a control signal and transmits the control signal to each LED power supply through a circuit; the LED power supply adopts commercial power to generate power required by the LED and comprises a rectifying and filtering circuit, a constant current control circuit and a dimming circuit; the commercial power generates direct current after passing through the rectifying and filtering circuit, and the direct current is connected with the dimming circuit after passing through the constant current control circuit; the dimming circuit comprises a voltage reduction constant current LED power switch, the voltage reduction constant current LED power switch is controlled by a main control circuit, and the main control circuit generates a PWM signal to be connected with the voltage reduction constant current LED power switch. The utility model discloses in, owing to increased the step-down constant current LED power switch by master control circuit control in LED drive power supply, can freely realize satisfying user's needs to LED's power control.

Description

LED drive circuit

Technical Field

The utility model relates to a LED field, especially the drive circuit when LED is used for animal growth illumination light source utilizes this drive circuit can conveniently control the lighting power that LED bred the lamp.

Background

Because of high luminous efficiency and long service life, the LED is used as a cultivation illuminating lamp in many occasions in recent years. The LED cultivation lamp is a new high-tech product which is made up with LED white light illumination in recent years. The LED cultivation lamp has many advantages such as accurate light quality, artificial combination and adjustment, high photosynthetic radiation of unit power consumption, good cultivation light supplement effect, low operation cost (super power saving), etc., and is therefore popular among all the world animal husbandry research institutes, intelligent cultivation factories, etc.

At present, the intelligent control level of the LED lamp for cultivation illumination is low, and the requirements of users cannot be met.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the LED lamp to breed the illumination at present is intelligent not enough that the level is low can not satisfy user's needs, provides a LED drive circuit, and LED's the luminous condition can be controlled according to user's needs to this circuit.

The utility model discloses a technical scheme who adopts for realizing above technical requirement is: an LED drive circuit comprises at least one LED power supply, wherein the LED power supply is connected with an LED; the LED power supply also comprises a main control circuit, wherein the main control circuit generates a control signal and transmits the control signal to each LED power supply through a line; the LED power supply adopts commercial power to generate power required by the LED and comprises a rectifying and filtering circuit, a constant current control circuit and a dimming circuit; the commercial power generates direct current after passing through the rectifying and filtering circuit, and the direct current is connected with the dimming circuit after passing through the constant current control circuit; the dimming circuit comprises a voltage reduction constant current LED power switch, the voltage reduction constant current LED power switch is controlled by a main control circuit, and the main control circuit generates a PWM signal to be connected with the voltage reduction constant current LED power switch.

Further, in the LED driving circuit described above: the voltage reduction constant current LED power switch U2 is of a KP14653 model, and a PWM signal generated by a main control circuit enters a corresponding pin of the voltage reduction constant current LED power switch U2.

Further, in the LED driving circuit described above: an optical isolation circuit is also arranged between corresponding pins of the voltage-reducing constant-current LED power switch U2, wherein the PWM signals generated by the main control circuit enter.

Further, in the LED driving circuit described above: the constant current control circuit adopts a high PF boosting constant current LED driving chip with the model number of KP 15113.

Further, in the LED driving circuit: the LED power supply also comprises an EMC circuit.

The utility model discloses in, owing to increased the step-down constant current LED power switch by master control circuit control in LED drive power supply, can freely realize satisfying user's needs to LED's power control.

The present invention will be further described with reference to the accompanying drawings and the detailed description.

Drawings

Fig. 1 is a schematic block diagram of an LED driving circuit according to embodiment 1 of the present invention;

fig. 2 is a schematic diagram of a dimming circuit in embodiment 1 of the present invention;

fig. 3 is a schematic diagram of a constant current control circuit in embodiment 1 of the present invention;

fig. 4 is a main control wiring diagram of embodiment 1 of the present invention.

Detailed Description

Embodiment 1, this embodiment is an LED driving circuit as shown in fig. 1 and fig. 4, the whole LED plant lamp is powered by commercial power, and includes a main control circuit box 100 and a central control circuit box 200, and an LED lamp set 300 is driven by the driving circuit of the central control circuit box. As shown in fig. 4, the main control circuit box 100 generates multiple paths of control signals, and the control signals are respectively connected to the central control circuit boxes 200 by using 5-core cables, where a PWM signal generated in the main control circuit box is transmitted to each central control circuit box 200 to control the corresponding control circuits in the central control circuit boxes 200, and each central control circuit box 200 can generate driving signals for multiple groups of LEDs, as shown in fig. 4, in this embodiment, one central control circuit box 200 generates 5 paths of LED group driving power supplies. In practice, different numbers of groups can be generated according to needs, corresponding channels of LED driving power supplies are arranged in the central control circuit box 200, and the main control circuit box 100 generates corresponding numbers of control signals to control the central control circuit box 200 of each different LED group through 4-core cables.

The LED power supply is shown in figure 1 and is connected with the LED; the main control circuit generates a control signal and transmits the control signal to each LED power supply through a line; in the embodiment, the LED power supply adopts commercial power to generate power required by the LED, and comprises a rectifying and filtering circuit, a constant current control circuit and a dimming circuit; the commercial power generates direct current after passing through the rectifying and filtering circuit, and the direct current is connected with the dimming circuit after passing through the constant current control circuit; the dimming circuit comprises a voltage reduction constant current LED power switch, the voltage reduction constant current LED power switch is controlled by a main control circuit, and the main control circuit generates a PWM signal to be connected with the voltage reduction constant current LED power switch.

In this embodiment, as shown in fig. 2, a buck constant-current LED power switch U2 used in the LED dimming circuit has a model number KP14653, and a PWM signal generated by the main control circuit enters a corresponding pin of the buck constant-current LED power switch U2. In addition, an optical isolation circuit is further arranged between corresponding pins of the voltage-reducing constant-current LED power switch U2, and an optical coupler U3 is used, wherein the PWM signals generated by the main control circuit enter. The PWM signal generated from the main control circuit box 100 is used to control the percentage of the on time of the driving power, and the duty ratio of the PWM signal is the percentage of the on time in the whole lighting time. The PWM signal is isolated by an optocoupler U3 and then input to a PWM signal input pin of a voltage reduction constant current LED power switch U2, and other pins can be connected with a power supply DC and an LED which are subjected to constant current control according to the data indication of a chip.

The constant current control circuit adopts a high PF boosting constant current LED driving chip with the model number KP15113 as shown in figure 3. KP15113 is a highly integrated boost PFC constant voltage power switch, the chip adopts quasi-resonance working mode, and can meet the requirements of high power factor, ultra-low harmonic distortion and high efficiency by adding active power factor correction control technology. The chip is integrated with a complete protection function to ensure the safe and reliable operation of the system, such as: VDD under-voltage protection function (UVLO), cycle-by-cycle current limit (0 CP), over-temperature protection (0 TP), output over-voltage protection (0 VP), output under-voltage protection (UVP), etc.

In addition, the LED power supply also comprises an EMC circuit which can be arranged between the commercial power input and the rectifier chip, and the EMC circuit is a rectifier circuit.

In this embodiment, PWM dimming is a dimming technique that repeatedly switches a white LED driver using simple digital pulses. The system of the user only needs to provide digital pulses with different widths, and the output current can be simply changed, so that the brightness of the white light LED can be adjusted. PWM dimming has the advantages of providing high quality white light, and simple application and high efficiency! For example, in a mobile phone system, a pulse signal with any duty ratio can be simply generated by using a special PWM interface, and the pulse signal is connected to an EN interface of a driver through a resistor. Drivers from most manufacturers support PWM dimming.

Whether Buck, boost, buck-Boost or linear regulators are used to drive LEDs, they all share the common idea of using a driving circuit to control the light output. Some applications are simply to implement the "on" and "off" functions, but more applications require the brightness of the light to be adjusted from 0 to 100% and often with a high degree of precision. The designer has two main options: linear adjustment of the LED current (analog dimming) or operation with a switching circuit at a frequency high enough for human eye recognition to change the average value of the light output (digital dimming).

Claims

1. An LED drive circuit comprises at least one LED power supply, wherein the LED power supply is connected with an LED; the method is characterized in that: the LED power supply also comprises a main control circuit, wherein the main control circuit generates a control signal and transmits the control signal to each LED power supply through a line;

the LED power supply adopts commercial power to generate power required by the LED and comprises a rectifying and filtering circuit, a constant current control circuit and a dimming circuit; the commercial power generates direct current after passing through the rectifying and filtering circuit, and the direct current is connected with the dimming circuit after passing through the constant current control circuit; the dimming circuit comprises a voltage reduction constant current LED power switch, the voltage reduction constant current LED power switch is controlled by a main control circuit, and the main control circuit generates a PWM signal to be connected with the voltage reduction constant current LED power switch.

2. The LED driving circuit according to claim 1, wherein: the voltage reduction constant current LED power switch U2 is of a KP14653 model, and a PWM signal generated by a main control circuit enters a corresponding pin of the voltage reduction constant current LED power switch U2.

3. The LED driving circuit according to claim 2, wherein: an optical isolation circuit is also arranged between corresponding pins of the voltage-reducing constant-current LED power switch U2, wherein the PWM signals generated by the main control circuit enter.

4. The LED driving circuit according to claim 1, wherein: the constant current control circuit adopts a high PF boosting constant current LED driving chip with the model number of KP 15113.

5. The LED driving circuit according to any one of claims 1 to 4, wherein: the LED power supply also comprises an EMC circuit.