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LED dimming circuit for suppressing voice frequency noise

A technology of dimming circuit, audio noise, applied in the direction of lamp circuit layout, light source, electric light source, etc.

Active Publication Date: 2015-12-30
SHENZHEN FM ELECTRONICS GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually the frequency ranges from 200Hz to 4kHz, but the dimming frequency of 200Hz to 4kHz will inevitably introduce audio noise

Method used

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  • LED dimming circuit for suppressing voice frequency noise
  • LED dimming circuit for suppressing voice frequency noise
  • LED dimming circuit for suppressing voice frequency noise

Examples

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Embodiment Construction

[0051] Below in conjunction with accompanying drawing, preferred embodiment of the present invention is described in further detail:

[0052] combine image 3 , an LED dimming circuit for suppressing audio noise, comprising a drive circuit and a switch circuit, the drive circuit comprising a demagnetization detection module, a logic circuit connected to the demagnetization detection module, and a MOS transistor M1 connected to the logic circuit through a gate And the comparator connected to the input terminal of the logic circuit through the output terminal; the switch circuit includes a sampling resistor R connected to the source of the MOS transistor M1 and the input terminal of the comparator at the same time SENSE , connect the sampling resistor R SENSE The inductance L at the input end, the capacitance C connected to the output end of the inductance L OUT and connecting the sampling resistor R SENSE output and the capacitor C OUT output diode D1, the capacitor C OUT ...

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Abstract

The invention discloses an LED dimming circuit for suppressing voice frequency noise. The LED dimming circuit comprises a drive circuit and a switch circuit. The drive circuit comprises a demagnetization detecting module, a logical circuit connected with the demagnetization detecting module, an MOS tube M1 connected with the logical circuit through a grid electrode and a comparator connected with the input end of the logical circuit through the output end. The switch circuit comprises a sampling resistor RSENSE, an inductor L, a capacitor COUT and a diode D1, wherein the sampling resistor RSENSE is connected with a source electrode of the MOS tube M1 and the input end of the comparator, the inductor L is connected with the input end of the sampling resistor RSENSE, the capacitor COUT is connected with the output end of the inductor L, the diode D1 is connected with the output end of the sampling resistor RSENSE and the output end of the capacitor COUT, and the capacitor COUT is connected with an LED lamp in parallel. The equivalent switch frequency of the dimming circuit is 20 KHZ-100KHZ.

Description

technical field [0001] The invention relates to an LED dimming circuit, in particular to an LED dimming circuit for suppressing audio noise. Background technique [0002] Generally, LED dimming is divided into PWM digital dimming and analog dimming. Traditional PWM digital dimming usually uses a low-frequency PWM signal to intermittently enable and disable the LED drive circuit, so as to achieve the purpose of dimming. Usually the frequency ranges from 200Hz to 4kHz, but the dimming frequency of 200Hz to 4kHz will inevitably introduce audio noise. Contents of the invention [0003] The object of the present invention is to provide an LED dimming circuit for suppressing audio noise, so that no noise will appear when the LED lamp is at different brightness. [0004] The technical solution of the present invention is an LED dimming circuit that suppresses audio noise, including a drive circuit and a switch circuit, the drive circuit includes a demagnetization detection modu...

Claims

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Application Information

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IPC IPC(8): H05B37/02
Inventor 杨敏秦鹏举苏丹
Owner SHENZHEN FM ELECTRONICS GRP CO LTD
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