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A waveform encoding method and system for improving the resolution of pwm signals

A PWM signal and waveform coding technology, applied in the field of digital coding, can solve problems such as increased implementation cost, and achieve the effect of saving circuit hardware cost and improving resolution

Active Publication Date: 2018-04-24
SOUTH CHINA NORMAL UNIVERSITY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this patent requires an additional design of a programmable delay loop circuit to achieve a time resolution higher than that of the main clock
Increased implementation cost due to addition of additional programmable delay loop circuitry

Method used

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  • A waveform encoding method and system for improving the resolution of pwm signals

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Embodiment Construction

[0018] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0019] In principle, from the analysis of the DC component, the PWM signal is originally linear.

[0020] The duty cycle α of PWM is defined as: α=T H / T 1 ;

[0021] PWM ideal low-pass filter output voltage: u=(V H -V L )*α;

[0022] Among them, T H is the high level time in a PWM cycle, T 1 is the PWM period, V H is the high-level voltage of the PWM signal, V L is the low-level voltage of the PWM signal. The output voltage u is proportional to the PWM waveform duty cycle α.

[0023] The basic idea of ​​the present invention is: encode two adjacent duty ratio PWM waveforms, the one with the smaller duty ratio as 0 (α 0 ), the code with a large duty cycle is 1 (α 1 ), so that between the two duty cycles, by adjusting the combination ratio of 0 and 1, as long as the number of 0 and 1 is large en...

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Abstract

The invention discloses a waveform encoding method and system for improving the resolution of PWM signals. The method includes the steps of: combining m period PWM waveforms in the first period interval with n PWM waveforms in the second period interval, and outputting the PWM combination waveform. The system includes a PWM waveform generation module, an acquisition module, and a waveform insertion module. The present invention utilizes an ordinary MCU with a hardware PWM module to insert a certain number of front and rear duty ratio signal waveforms between realized duty ratio signals to effectively improve the resolution. On the premise of not changing the frequency of the main clock or reducing the frequency of the PWM signal, the present invention can effectively improve the resolution of the PWM signal by adjusting the duty cycle through a simple algorithm and save the circuit hardware cost at the same time. The invention can be widely applied to various PWM waveform coding systems.

Description

technical field [0001] The invention relates to a digital encoding method, in particular to a PWM signal waveform encoding method and system. Background technique [0002] PWM: Pulse Width Modulation, pulse width modulation. [0003] PWM resolution: refers to the adjustable series of PWM duty cycle. [0004] MCU: Microcontroller Unit, microprocessor. [0005] The time resolution of a PWM circuit depends on the clock frequency. In general, in order to improve the time resolution of PWM, it is to increase the main clock frequency of the PWM circuit. However, when the clock frequency is too high, the circuit cost will increase significantly, and the high-frequency clock will cause serious radio frequency interference. In the patent document with the application number CN200480016109.9, a circuit design scheme is introduced to improve the PWM resolution without increasing the main clock frequency. However, this patent requires an additional design of a programmable delay lo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03K7/08
CPCH03K7/08
Inventor 翟迪国易子川周国富
Owner SOUTH CHINA NORMAL UNIVERSITY