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A kind of led driver chip, led driver circuit and led lamp

A technology of LED driver and LED lamp group, applied in the field of lighting, can solve the problem of inaccurate judgment of current adjustment range and so on

Active Publication Date: 2016-09-28
SHENZHEN SHENDIE SEMICON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide an LED driver chip, aiming to solve the problem of inaccurate judgment of the current adjustment range in the existing LED lamps using the AC LED driver scheme

Method used

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  • A kind of led driver chip, led driver circuit and led lamp
  • A kind of led driver chip, led driver circuit and led lamp
  • A kind of led driver chip, led driver circuit and led lamp

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] figure 1 The module structure of the LED driver chip provided by this embodiment is shown. For the convenience of description, only the parts related to this embodiment are shown, and the details are as follows:

[0026] The LED driver chip provided in this embodiment is connected to the rectifier bridge 10 and the LED lamp group 30 .

[0027] In this embodiment, the number of LED lamp groups 30 may be one or more, and the connection thereof belongs to the prior art, and will not be repeated here.

[0028] The LED driver chip also includes a control module 20, the output end of the rectifier bridge 10 is connected to the input end of the LED lamp group 30, the output end of the LED lamp group 30 is connected to the input end of the control module 20, and the output end of the control module 20 is connected to the rectifier bridge 10 the DC input terminal.

[0029] Specifically, the AC input end of the rectifier bridge 10 is connected to the AC mains, and the AC mains ...

Embodiment 2

[0046]The implementation of this embodiment is based on the previous embodiment.

[0047] Figure 4 The module structure of the LED driver chip provided by this embodiment is shown. For the convenience of description, only the parts related to this embodiment are shown, and the details are as follows:

[0048] In this embodiment, the detection module 50 includes a clock signal source 52a, a counter 53a and a voltage comparison module 51a;

[0049] The input terminal of the voltage comparison module 51a is the input terminal of the detection module 50, the enable terminal and the input terminal of the counter 53a are respectively connected with the output terminal of the voltage comparison module 51a and the output terminal of the clock signal source 52a, and the output terminal of the counter 53a is the detection module output of 50;

[0050] When the output voltage of the rectifier bridge 10 is higher than the preset voltage value, the voltage comparison module 51a controls...

Embodiment 3

[0067] Figure 7 The module structure of the LED driver chip provided by this embodiment is shown. For the convenience of description, only the parts related to this embodiment are shown, and the details are as follows:

[0068] The embodiment of this embodiment is based on the previous embodiment; different from the previous embodiment, this embodiment uses a detection module 50 with a different structure to detect the maximum voltage value of each rectification cycle.

[0069] In this embodiment, the detection module 50 may include:

[0070] Analog-to-digital conversion module 51b, storage module 52b and comparator 53b;

[0071] The input end of the analog-to-digital conversion module 51b is the input end of the detection module 50, the first input end of the comparator 53b and the input end of the storage module 52b are connected to the output end of the analog-to-digital conversion module 51b, and the output end of the comparator 53b is connected The enable terminal of t...

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Abstract

The invention belongs to the field of LED illumination and particularly relates to an LED driving chip, an LED driving circuit and an LED lamp. The LED driving chip is connected with a rectifying bridge and an LED lamp group and comprises a detection module, a signal output module and a control module, wherein the detection module, the control module and the LED lamp group are connected with the rectifying bridge, and the detection module is connected with the signal output module connected with the control module. The rectifying bridge has access to alternating current mains and supplies power to the control module and the LED lamp group. The detection module judges time of a voltage higher than a preset voltage value or the largest voltage value by detecting output voltages in all rectifying cycles. Due to the fact that the chip can acquire time or the output voltages higher than the preset voltage value in all rectifying cycles or the largest voltage value, current regulation amplitude can be judged accurately, LED flashing caused by voltage fluctuation of the alternating current mains is inhibited effectively, and constant light output of an LED remains.

Description

technical field [0001] The invention belongs to the technical field of lighting, and in particular relates to an LED driving chip, an LED driving circuit and an LED lamp. Background technique [0002] With the advantages of high efficiency, high integration and long life, LED lamps are more and more widely used in the lighting field. In LED lamps, due to the requirements for integration and manufacturing costs, AC LED drive schemes without inductance and capacitors and other energy storage devices account for an increasing share of the market, and will definitely become the mainstream in the future. This type of driving scheme is to control the on-off of the switch tube by the control chip to adjust the number of actually working LED lamp groups, so as to achieve the purpose of limiting the current flowing through the LED lamp groups. [0003] Traditional LED lamps detect the mains voltage through a resistor divider network and make related adjustments. Since traditional LE...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B37/02
Inventor 谢中顺陈小雨钟祥林
Owner SHENZHEN SHENDIE SEMICON
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