LED automatic following constant power circuit of constant current source

A constant power circuit and automatic follow-up technology, applied in the direction of electrical components, etc., can solve the problems of output voltage deviation, different irradiation effects, voltage drop deviation, etc.

Active Publication Date: 2021-03-19
GUANGDONG NRE TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] LEDs provide lighting for the growth of plants, but in the production process of LED lamp beads, it is inevitable that there will be deviations in voltage drop, and the level of operating temperature will also cause deviations in output voltage. The irradiation effect of the area is different, the area with high output power grows well, and the area with low output power has poor growth. The power circuit is implemented by a combination of software and hardware, which is expensive and difficult to maintain

Method used

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  • LED automatic following constant power circuit of constant current source

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Embodiment Construction

[0017] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0018] The automatic following constant power circuit of this embodiment is applied to the LED power supply, wherein the LED power supply needs to be a constant current source to ensure that only the current loop works, and the voltage loop only works to limit the maximum output voltage.

[0019] Such as figure 1 As shown, the automatic following constant power circuit first takes the voltage from the secondary rectification output...

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Abstract

The invention relates to the field of LED driving, in particular to an LED automatic following constant power circuit of a constant current source, which comprises a first voltage division circuit, asecond voltage division circuit, a reverse operational amplifier U6 and a resistor R25, the first voltage division circuit obtains secondary rectification output voltage of the LED power supply, divides the voltage and then sends the divided voltage into a voltage error amplifier of the LED constant current source to limit the maximum output voltage; and after the second voltage division circuit obtains the secondary rectification output voltage of the LED power supply for voltage division, the current loop reference voltage of the current error amplifier in the LED constant current source isfed back and adjusted through the reverse operational amplifier U6 and the resistor R25 in sequence. According to the invention, the output (lamp bead) voltage is detected, and the current loop reference voltage of the current error amplifier in the LED constant current source is fed back and adjusted through the reverse operational amplifier according to the actual voltage of the lamp bead, so that the output current of the LED constant current source is changed, and the output power of the LED constant current source is kept constant by a pure hardware circuit.

Description

technical field [0001] The invention relates to the field of LED driving, in particular to a constant current source LED automatic follow constant power circuit. Background technique [0002] LEDs provide lighting for the growth of plants, but in the production process of LED lamp beads, it is inevitable that there will be deviations in voltage drop, and the level of operating temperature will also cause deviations in output voltage. The irradiation effect of the area is different, the area with high output power grows well, and the area with low output power has poor growth. The power circuit is implemented by a combination of software and hardware, which is expensive and difficult to maintain. Contents of the invention [0003] The purpose of the present invention is to adopt pure hardware circuit to realize automatic power following of LED constant current source. [0004] The present invention is realized through the following technical solutions: [0005] An automa...

Claims

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Application Information

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IPC IPC(8): H05B45/345H05B45/37
CPCH05B45/345H05B45/37
Inventor 刘新明
Owner GUANGDONG NRE TECH
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