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Lighting driving circuit and method and lighting system

A lighting drive and circuit technology, applied in the field of power electronics, can solve problems such as output average current changes, and achieve the effect of improving consistency and linear adjustment rate

Pending Publication Date: 2019-11-15
JOULWATT TECH INC LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the object of the present invention is to provide a lighting driving circuit and method and a lighting system that improve the linear adjustment rate and consistency, so as to solve the problems in the prior art that the output average current changes with the input voltage or the load voltage. technical problem

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  • Lighting driving circuit and method and lighting system
  • Lighting driving circuit and method and lighting system
  • Lighting driving circuit and method and lighting system

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Embodiment Construction

[0030] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited to these embodiments. The present invention covers any alternatives, modifications, equivalent methods and solutions made within the spirit and scope of the present invention.

[0031] In order for the public to have a thorough understanding of the present invention, specific details are described in the following preferred embodiments of the present invention, and those skilled in the art can fully understand the present invention without the description of these details.

[0032] In the following paragraphs, the present invention is described in more detail by way of example with reference to the drawings. It should be noted that the drawings all adopt a relatively simplified form and all use imprecise proportions, which are only used to facilitate and clearly assist the description of the embodiments of ...

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Abstract

The invention discloses a lighting driving circuit and method and a lighting system. An alternating current power supply supplies input voltage to a load through a rectifier bridge. A thyristor dimmeris connected between the alternating current power supply and the rectifier bridge. The driving circuit comprises a thyristor on-time detection circuit, a first module, a second module and a currentadjustment circuit. The thyristor on-time detection circuit detects the thyristor's on-time and acquires the thyristor's on-time signal. The first module receives the on-time signal of the thyristor to acquire the expected output average current value. The second module receives the expected output average current value, samples the load current, and adjusts the current reference value of the loadaccording to the expected output average current value and the load current. The current adjustment circuit receives the current reference value of the load, so that the load current is equal to thecurrent reference value of the load. According to the invention, the output average current does not change with the input voltage or load voltage, and the consistency and the linear adjustment rate are improved.

Description

Technical field [0001] The present invention relates to the field of power electronics technology, in particular to a lighting drive circuit and method, and a lighting system. Background technique [0002] In the lighting drive circuit, LEDs are commonly used lighting sources. Taking the LED drive circuit as an example, the existing technology linear LED drive circuit is widely used in lighting systems due to its simple circuit and low cost. Such as figure 1 Shown is a schematic diagram of a prior art linear LED drive circuit. The negative end of the LED is connected to the first end of the regulator tube M1, the second end of the regulator tube M1 is connected to one end of the sampling resistor, the other end of the sampling resistor is grounded, and the operational amplifier The first input terminal is connected to the common terminal of the regulator tube and the sampling resistor, the second input terminal receives the reference voltage Vref, and the output terminal is conne...

Claims

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Application Information

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IPC IPC(8): H05B33/08H05B44/00
CPCY02B20/30
Inventor 白浪黄必亮周逊伟
Owner JOULWATT TECH INC LTD