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Lighting control circuit and chip

A lighting control circuit and lighting module technology, applied in the direction of electrical components, etc., can solve problems such as high power consumption, complex implementation methods, and inability to accurately control LED current, and achieve the effect of reducing complexity and power consumption

Pending Publication Date: 2022-04-15
SHENZHEN FM ELECTRONICS GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both of these methods cannot precisely control the LED current when deep dimming is required
In order to solve this problem, the prior art discloses to simultaneously control the conduction time and frequency of the switch tube for deep dimming in discontinuous current mode to achieve precise dimming. However, this method needs to simultaneously control the conduction time and frequency For calculation and control, the implementation method is more complicated and the power consumption is higher

Method used

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  • Lighting control circuit and chip
  • Lighting control circuit and chip
  • Lighting control circuit and chip

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0060] see Figure 9, the first comparison unit 111 may be the first comparator 1111, the second comparison unit 112 may be the second comparator 1121, the resistor may include the first resistor 131, the compensation current module 14 may include the compensation current unit 141, and the logic operation module 12 may include a first NAND gate 1231. The first resistor 131 is connected between the first input terminal of the first comparator 1111 and the first input terminal of the second comparator 1121, the second input terminal of the first comparator 1111 receives the first threshold voltage VTH1, the second The second input terminal of the comparator 1121 receives the second threshold voltage VTH2, the output terminal of the first comparator 1111 and the output terminal of the second comparator 1121 are respectively connected with the first input terminal and the second input terminal of the first NAND gate 1231 connect. The output end of the first NAND gate 1231 is con...

example 2

[0078] see Figure 11, compared with Example 1, the difference in this example is that the first comparison unit 111 includes a third comparator 1112, the second comparison unit 112 includes a fourth comparator 1122, the resistor 13 includes a second resistor 132, and the gate logic The unit includes a first NOT gate 1232 , a second NOT gate 1233 and a second NAND gate 1234 . The second resistor 132 is connected between the first input terminal of the third comparator 1112 and the first input terminal of the fourth comparator 1122. The second input terminal of the third comparator 1112 receives the first threshold voltage VTH1, and the fourth The second input terminal of the comparator 1122 receives the second threshold voltage VTH2, the output terminal of the third comparator 1112 and the output terminal of the fourth comparator 1122 are respectively connected with the input terminal of the first NOT gate 1232 and the input of the second NOT gate 1233 end connection. The ou...

Embodiment 2

[0082] A lighting control chip includes the lighting control circuit 100 of the first embodiment.

[0083] For the products provided by the embodiments of the present invention, for the purpose of brief description, for the parts not mentioned in the embodiments, reference may be made to the corresponding contents in the foregoing embodiments.

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Abstract

The invention discloses a lighting control circuit and a chip, which are applied to a lighting circuit provided with a dimming switch tube and a lighting module, and the lighting control circuit comprises a comparison module, a control module, a power supply module and a control module, a second input end of the first sampling circuit receives a second sampling voltage which is always greater than or equal to the first sampling voltage, a third input end of the first sampling circuit receives a first threshold voltage compared with the first sampling voltage, and a fourth input end of the first sampling circuit receives a second threshold voltage compared with the second sampling voltage; and the logical operation module is connected with the output end of the comparison module and is configured to control the frequency of the dimming switch tube according to the output result of the comparison module in the intermittent current mode. According to the invention, the on-off frequency of the dimming switch tube is controlled based on the comparison result so as to control the current flowing through the lighting module, the control of interrupted current is well realized, accurate dimming is realized, the complexity of the circuit is reduced, and the power consumption is reduced.

Description

technical field [0001] The invention relates to the field of integrated circuits, in particular to a lighting control circuit and a chip. Background technique [0002] At present, due to the advantages of small size, light weight, and fast response speed of LED lighting sources, LED lighting sources are more and more widely used in the field of lighting. In practical applications, the LED lighting source can usually adjust the brightness of the LED by adjusting the current flowing through the LED, and the dimming depth is directly related to the performance of the LED lighting source. However, the dimming methods in the prior art generally include: PWM pulse width direct dimming, adjusting the current flowing through the LED by inputting PWM signals with different duty ratios; analog dimming, adjusting the LED light by comparing the sampling voltage and the reference voltage. current. Both of these methods cannot precisely control the LED current when deep dimming is requi...

Claims

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Application Information

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IPC IPC(8): H05B45/10H05B45/30
Inventor 胡渊杨兆喃
Owner SHENZHEN FM ELECTRONICS GRP CO LTD
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