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Light-emitting diode (LED) driving circuit and LED lamp

A LED drive and circuit technology, applied in the direction of electric lamp circuit layout, electric light source, electrical components, etc., can solve the problems that the output current cannot be kept stable for a long time, the circuit structure is complicated, and the cost is high, and it can solve the problem that the long-term stability cannot be maintained and the circuit structure is simple , low cost effect

Inactive Publication Date: 2013-06-26
OCEANS KING LIGHTING SCI&TECH CO LTD +1
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  • Abstract
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Problems solved by technology

[0004] The present invention provides an LED drive circuit, aiming to solve the problem that the output current in the existing LED drive circuit cannot be kept stable for a long time, and the circuit structure is complicated and the cost is high

Method used

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  • Light-emitting diode (LED) driving circuit and LED lamp
  • Light-emitting diode (LED) driving circuit and LED lamp

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Embodiment Construction

[0022] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0023] In the embodiment of the present invention, by adopting an EMC filter unit, a first rectification filter unit, a step-down unit, a voltage transformation unit, a constant current output unit, a PWM control unit, a switch unit, a second rectification filter unit, a voltage supply unit, The output stage voltage comparison unit, the load current tracking unit and the LED drive circuit of the secondary feedback unit realize the purpose of providing constant current for the LED load at the output stage, and the circuit structure is simple, the cost is low, and the electrical efficiency is improved...

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Abstract

The invention belongs to the field of electronic lighting and provides an LED driving circuit and an LED lamp. The LED driving circuit which is composed of an electromagnetic compatibility (EMC) filtering unit, a first rectifying and filtering unit, a voltage reduction unit, a voltage transformation unit, a constant-current output unit, a pulse-width modulation (PWM) control unit, a switching unit, a second rectifying and filtering unit, a voltage supply unit, an output stage voltage comparison unit, a load current tracing unit and a secondary feedback unit is used for providing a constant current for an LED load at an output stage, and the circuit is simple in structure, low in cost and capable of improving the electrical efficiency, so that the problems that output current of existing LED driving circuits cannot be kept stable for a long term and the existing circuit is complex in structure and high in cost can be solved.

Description

technical field [0001] The invention belongs to the field of electronic lighting, and in particular relates to an LED driving circuit and an LED lamp. Background technique [0002] At present, as a new type of light source, LED has been widely used in people's daily life because of its mature technology and the characteristics of energy saving, environmental protection and high efficiency. [0003] Most of the existing LED drive circuits include EMI filter circuits, PFC circuits, secondary feedback loops, and overcurrent and overvoltage protection circuits. However, due to the lack of an output stage constant current circuit in the existing LED drive circuit, the output current of the entire drive circuit cannot be kept stable for a long time, and the structure of the entire LED drive circuit is complicated, and there is a disadvantage of high cost. In projects with relatively high requirements, this kind of circuit is not suitable. Contents of the invention [0004] The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02H02M1/12
Inventor 周明杰黎晶
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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