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Digital pulse width modulator

A width modulation, digital pulse technology, applied in the field of electronics, can solve the problem of low PWM precision, and achieve the effect of reducing power consumption, reducing dependence, and low power consumption

Active Publication Date: 2017-09-29
中科众志信通(大连)科技有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0008] In order to solve the above-mentioned problems in the prior art, the present invention provides a digital pulse width modulator to solve the technical problem of low PWM precision in the prior art

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Embodiment Construction

[0032] The invention provides a digital pulse width modulator to solve the technical problem of low PWM precision in the prior art.

[0033] The technical solution in the embodiment of the present application is to solve the above-mentioned technical problems, and the general idea is as follows: a hybrid structure is used to generate a PWM signal, such as figure 1As shown, if the data bit width of a single PWM is a total of N bits, where [N-1, m+1] is the coarse adjustment coefficient, the initial control signal of the PWM is generated, the end control position of the PWM is roughly determined, and the output PWM frequency is determined. ;[m,0] is the fine-tuning coefficient, which precisely controls the end position of the PWM signal and determines the accuracy of the output PWM signal.

[0034] In order to better understand the above technical solutions, the technical solutions of the present invention will be described in detail below through the accompanying drawings and s...

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Abstract

The invention belongs to the field of electronic technologies, and relates to a digital pulse width modulator. The digital pulse width modulator comprises a differential clock selection module, a coursing regulating module, a fine modulating module and a PWM signal generation module, wherein the coursing regulating module determines frequency for outputting PWM waves according to a synchronous counter, the differential clock selection module selects an input clock of the fine regulating module, the fine modulating module uses a ripper counter to generate an end position control signal of the PWM signals, and the PWM signal generation module controls output of the PWM signals according to the control signals of the coursing regulating and fine regulating modules. Therefore, the technical problem that in the prior art, PWM accuracy is low is solved, and the technical effects of improving the PWM accuracy and reducing a dependence degree of generation of the high accuracy PWM waves to a programmable logic gate chip are achieved.

Description

technical field [0001] The invention belongs to the field of electronic technology, in particular to a digital pulse width modulator. Background technique [0002] Pulse Width Modulators (PWM, Phase Width Modulators) are widely used in the fields of motor control and power conversion. In the field of motor control, waveforms with different duty ratios can control the working speed of the motor, and high-precision PWM can improve the working efficiency of the motor. In the field of power conversion, such as DC-DC conversion (DC-DC), the accuracy of PWM generally determines the conversion efficiency of the power supply; generally speaking, the frequency of PWM often reflects the working conditions of the system, and the accuracy of PWM determines In order to control the accuracy of the output voltage or current. The accuracy of PWM can often affect the performance of the whole system. [0003] At present, there are many ways to generate PWM. You can use a single-chip microc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K7/08
CPCH03K7/08
Inventor 张锦涛邱昕慕福奇冷永清郭瑞赵潇腾
Owner 中科众志信通(大连)科技有限公司
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