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The anti-interference detection circuit of the feedback pin of the led driver chip

A technology of LED drive and detection circuit, which is applied in the measurement of interference from external sources, measurement of electricity, measurement of electrical variables, etc., can solve the problems of large noise interference of switching power supply, accidental trigger protection mechanism, abnormal detection of demagnetization state, etc., to achieve reliable detection. accurate effect

Active Publication Date: 2019-01-29
SHANGHAI ORIENT CHIP TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, when the switch is normally turned off (switching signal swon'=0), due to the large noise interference of the switching power supply itself, if the circuit wiring is not standardized or the actual application situation is bad, the feedback detection voltage FB will also be seriously interfered, which may lead to accidental triggering Protection mechanism, demagnetization state detection abnormality, resonance detection abnormality, thus affecting the detection result of feedback detection voltage FB

Method used

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  • The anti-interference detection circuit of the feedback pin of the led driver chip
  • The anti-interference detection circuit of the feedback pin of the led driver chip
  • The anti-interference detection circuit of the feedback pin of the led driver chip

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Embodiment Construction

[0035] According to the attached Figure 3-4 , give a preferred embodiment of the present invention, and give a detailed description, so that the functions and characteristics of the present invention can be better understood.

[0036] see image 3 , an anti-jamming detection circuit for the feedback pin of an LED driver chip according to the present invention includes a detection circuit body 1 and an anti-jamming module 2, and the anti-jamming module 2 is connected to the detection circuit body 1 to prevent the detection circuit body 1 from A feedback detection voltage exceeds a fixed threshold, and the feedback detection voltage is filtered.

[0037]Wherein, the detection circuit body 1 includes: an inductor or winding L0 , two voltage divider resistors Rup, Rdn, two parasitic capacitors Cup, Cdn and a signal output circuit 11 . A first end of the inductor or winding L0 is connected to a voltage input end to receive an input voltage Vin, and a second end of the inductor o...

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Abstract

The invention provides an anti-interference detection circuit for a feedback pin of an LED driving chip. The anti-interference detection circuit comprises a detection circuit body and also comprises an anti-interference module, wherein the anti-interference module is connected with the detection circuit body and is used for preventing a feedback detection voltage of the detection circuit body from exceeding a fixed threshold value and filtering the feedback detection voltage. By the anti-interference detection circuit for the feedback pin of the LED driving chip, a protection mechanism can be prevented from being triggered by mistake due to excessive high feedback detection voltage, meanwhile, the interference of the feedback detection voltage can be effectively filtered on the basis of no influence on resonance detection of the feedback detection voltage, and the effectiveness and the accuracy of a detection result are improved.

Description

technical field [0001] The invention relates to the field of anti-interference circuits, in particular to an anti-interference detection circuit for feedback pins of LED drive chips. Background technique [0002] The feedback pin (FB pin) of the LED driver chip is not only used to detect abnormal states such as output open and short circuits, but also provides the necessary timing detection for the normal operation of the system. When the FB pin is disturbed, the abnormal working sequence of the system will affect the constant current effect; if it is serious, it may accidentally trigger the protection mechanism of the chip under abnormal state, causing the system to fail to work. [0003] At present, the application circuit of the LED driver chip generally detects the open and short circuit abnormal state of the system, the demagnetization state of the inductor and the FB resonance by connecting the two ends of the inductor or the auxiliary winding to the FB pin of the chip...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/20H02M1/44G01R31/00
CPCG01R31/001H02H7/20H02M1/44
Inventor 不公告发明人
Owner SHANGHAI ORIENT CHIP TECH CO LTD
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