Device and method for generating pulse width modulation signal
A technology of pulse width modulation signal and modulation wave, which is applied in the field of devices for generating pulse width modulation signals. It can solve the problems of small modulation wave resolution, unsmooth waveform, and inaccurate PWM signal, and achieve high resolution and smooth waveform. Effect
Active Publication Date: 2014-02-26
SILERGY SEMICON TECH (HANGZHOU) CO LTD
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Problems solved by technology
[0003] The present invention provides a device and method for generating a pulse width modulation signal to solve the problem that when N2+N3>N1 and the duty cycle signal takes a small value, the resolution of the modulation wave is very small and the waveform is not smooth, resulting in the PWM signal imprecise question
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[0035] The device and method for generating a pulse width modulation signal proposed by the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. According to the following description and claims, the advantages and features of the present invention will be clearer. It should be noted that the drawings are in a very simplified form and all use imprecise ratios, which are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.
[0036] The core idea of the present invention is to provide a device and method for generating a pulse width modulation signal. The device for generating a pulse width modulation signal includes a carrier wave generating module and a modulated wave generating module. The carrier wave generated by the carrier wave generating module is compared with the The modulated wave generated by the modulated wave generating module...
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The invention provides a device and method for generating a pulse width modulation signal. The device for generating the pulse width modulation signal comprises a carrier wave generating module and a modulation wave generating module, and by comparing carrier waves generated by the carrier wave generating module with modulation waves generated by the modulation wave generating module, the pulse width modulation signal is generated. In the device and method for generating the pulse width modulation signal, a digital signal of a duty ratio signal and a digital signal which is found with an angle signal serving as an index are represented and do not undergo numerical multiplication, the period of sawtooth waves is changed through the duty ratio signal, and therefore the modulation waves are not influenced by the change of the duty ratio, and the modulation waves with the high resolution ratio and the smooth waveform can also be generated even when the sum of N2 and N3 is larger than N1 and even under the condition that the duty ratio is very small.
Description
Technical field [0001] The invention relates to the field of circuit design, and in particular to a device and method for generating pulse width modulation signals. Background technique [0002] The PWM (Pulse Width Modulation) signal can be obtained by comparing the carrier wave and the modulating wave. Generally, the carrier wave is a sawtooth wave, and the modulating wave is set according to actual needs. In practical applications, the sawtooth wave and modulated wave are converted into digital signals through analog-to-digital conversion, and then the corresponding digital signals of the two are compared to generate PWM signals. figure 1 A circuit diagram representing a traditional PWM signal generating device is given, such as figure 1 As shown, the PWM signal is obtained by comparing the carrier wave and the modulating wave. The generation process of the carrier wave is: the sawtooth wave with a period of T1 is an analog signal, which is converted into a period by the N1 dig...
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Inventor 曹何金生黄晓冬
Owner SILERGY SEMICON TECH (HANGZHOU) CO LTD