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
CN103179731AInactive Publication Date: 2013-06-26OCEANS KING LIGHTING SCI&TECH CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
OCEANS KING LIGHTING SCI&TECH CO LTD
Publication Date
2013-06-26
Estimated Expiration
Not applicable · inactive patent

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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.
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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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