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A buck type light emitting diode circuit

A light-emitting diode and circuit technology, applied in the electronic field, can solve problems affecting current stability, light-emitting diode current influence, etc., and achieve the effect of current stability

Active Publication Date: 2018-10-09
WUXI CHINA RESOURCES HUAJING MICROELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of this, the embodiment of the present invention provides a buck-type light-emitting diode circuit to solve the problem of buck-type light-emitting diode circuits in the prior art. When the AC voltage input by the power grid fluctuates or the ambient temperature fluctuates, the The current of the light-emitting diode has a large impact, thus affecting the technical problem of the stability of its current

Method used

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  • A buck type light emitting diode circuit
  • A buck type light emitting diode circuit
  • A buck type light emitting diode circuit

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Embodiment Construction

[0029] 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, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, only parts related to the present invention are shown in the drawings but not all content.

[0030] An embodiment of the present invention provides a buck type light emitting diode circuit. figure 2 It is a structural schematic diagram of a BUCK type light-emitting diode circuit provided by an embodiment of the present invention. Such as figure 2 As shown, the BUCK-type light-emitting diode circuit includes: a step-down unit 11, a light-emitting diode circuit unit 12, an N-type switch tube 13, and a control unit 14, wherein the step-down unit 11 is used to input from the grid to the BUCK-type The AC voltage of the...

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Abstract

The invention discloses a BUCK type light-emitting diode circuit, which comprises: a step-down unit, a light-emitting diode loop unit, an N-type switching tube and a control unit, wherein the step-down unit is used for stepping down an AC voltage input from a power grid to the BUCK type light-emitting diode circuit; the light-emitting diode loop unit comprises at least one light-emitting diode, is connected with the step-down unit and the N-type switching tube, and enables the light-emitting diode to emit light continuously under the condition that the N-type switching tube is switched off; the control unit comprises a Darlington transistor composed of two N-type bipolar triodes, is connected with the N-type switching tube and the light-emitting diode loop unit, and controls the on / off of the N-type switching tube through temperature compensation and voltage feedback. The BUCK type light-emitting diode circuit provided by the invention can make the current in the light-emitting diode in the circuit stable when the AC voltage input by the power grid fluctuates or the ambient temperature fluctuates.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a BUCK type light emitting diode circuit. Background technique [0002] BUCK type circuit, also known as step-down conversion circuit, this circuit can step down a higher input voltage, and then output to the load connected to the circuit to provide the load with working voltage, for example, BUCK type circuit can be used for lighting The light emitting of a diode (Light-Emitting Diode, LED for short) provides an operating voltage. [0003] figure 1 It is the circuit diagram of the BUCK type LED circuit in the prior art. Such as figure 1 As shown, the BUCK type LED circuit includes: a fuse FUS, a rectifier bridge composed of four first diodes DS1, an inductor LS1, a first capacitor to a third capacitor (CS1-CS3), a first LED LDS1, the second light-emitting diode LDS2, the second diode DS2, the third diode DS3, the primary winding TS1 and the secondary winding TS2 of the t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B37/02
Inventor 朱方杰胡健峰吕文生
Owner WUXI CHINA RESOURCES HUAJING MICROELECTRONICS
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