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LED driving circuit and power frequency square wave signal sampling circuit and method

A technology of square wave signal and sampling circuit, applied in the direction of electrical components, energy-saving control technology, etc., can solve problems such as parasitic amplitude modulation, output voltage jitter, human damage, etc.

Active Publication Date: 2020-10-30
CRM ICBG (WUXI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide an LED drive circuit, a power frequency square wave signal sampling circuit and a method for solving the problem in the prior art that the sampling frequency cannot be an integer of the power frequency. times and lead to parasitic amplitude modulation, the output voltage jitters lower than the power frequency frequency, thus causing damage to the human body

Method used

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  • LED driving circuit and power frequency square wave signal sampling circuit and method
  • LED driving circuit and power frequency square wave signal sampling circuit and method
  • LED driving circuit and power frequency square wave signal sampling circuit and method

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Embodiment 1

[0081] see image 3 , the present invention provides a kind of power frequency square wave signal sampling circuit, described power frequency square wave signal sampling circuit comprises: sampling module 1, described sampling module 1 is connected with power frequency square wave signal input end, is used for power frequency square wave signal (i.e. image 3 The input voltage signal VIN shown in ) is sampled to obtain the sampling voltage V1; the internal clock signal module 2 is connected to the sampling module 1 for generating the clock signal CLK, and according to the The clock signal CLK controls the sampling frequency of the sampling module 1; the power frequency cycle reset module 3, one end of the power frequency cycle reset module 3 is connected with the power frequency square wave signal input end, and the other end is connected with the internal clock signal The module 2 is connected to reset the clock signal CLK at the same moment of each power frequency cycle, an...

Embodiment 2

[0089] Please combine Figure 3 to Figure 5 , the present invention also provides a kind of power frequency square wave signal sampling method, described power frequency square wave signal sampling method comprises: in the process of power frequency square wave signal sampling, at the same moment of each power frequency cycle, will control the sampling frequency The clock signal is reset and causes the clock signal to count again.

[0090] As an example, the clock signal may be reset on a rising edge or a falling edge of each power frequency cycle, and the clock signal may be re-counted.

[0091] As an example, the power frequency square wave signal sampling method can be performed based on the power frequency square wave signal sampling circuit described in Embodiment 1. For the specific structure of the power frequency square wave signal sampling circuit, please refer to Embodiment 1, here No longer repeat.

[0092] The power frequency square wave signal sampling method pr...

Embodiment 3

[0094] The present invention also provides an LED driving circuit, the LED driving circuit includes: the power frequency square wave signal sampling circuit as described in the first embodiment, the specific structure of the power frequency square wave signal sampling circuit can be found in the first embodiment , no longer exhausted here; buffer 5, the buffer 5 includes a first input, a second input and an output, the first input of the buffer 5 and the power frequency square wave signal sampling The output terminals of the circuit are connected; the power tube 6, the power tube 6 can include a control terminal, a first terminal and a second terminal, and the control terminal of the power tube 6 is connected with the output terminal of the buffer 5, so The second end of the power tube 6 is connected to the second input end of the buffer 5; LED7, one end of the LED7 is connected to the input voltage VIN, and the other end of the LED7 is connected to the second input end of the ...

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Abstract

The invention provides an LED driving circuit and a power frequency square wave signal sampling circuit and method. The power frequency square wave signal sampling circuit comprises a sampling module,an internal clock signal module and a power frequency period reset module, wherein the sampling module is connected with a power frequency square wave signal input end and is used for sampling a power frequency square wave signal so as to obtain a sampling voltage; the internal clock signal module is connected with the sampling module and is used for generating a clock signal and controlling thesampling frequency of the sampling module according to the clock signal; and one end of the power frequency period reset module is connected with the power frequency square wave signal input end, theother end of the power frequency period reset module is connected with the internal clock signal module, and the power frequency period reset module is used for resetting the clock signals at the samemoment of each power frequency period and recounting the clock signals. The power frequency square wave signal sampling circuit can solve the problem of parasitic amplitude modulation, so that flickering of an LED lamp caused by low-frequency jitter of output voltage is avoided, and damage to a human body is avoided.

Description

technical field [0001] The invention belongs to the technical field of circuit design, and in particular relates to an LED drive circuit, a power frequency square wave signal sampling circuit and a method. Background technique [0002] In the LED driving circuit, it is often necessary to filter the power frequency square wave signal to obtain a voltage reference that can reflect the duty cycle, and then control the brightness of the lamp according to the voltage reference. A current approach is to use switched capacitors to sample the duty ratio square wave signal, and then obtain a filtered reference voltage signal through the sampling voltage control module. The shortcoming of the current thinking is that the number of sampling points and the corresponding phases of the sampling points in each power frequency cycle will be different because the internal clock sampling frequency of the chip is not an integer multiple of the power frequency, which will lead to the problem of...

Claims

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Application Information

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IPC IPC(8): H05B45/30
CPCY02B20/40
Inventor 张识博卢圣晟刘军
Owner CRM ICBG (WUXI) CO LTD