Signal modulation device and control method thereof

Abstract

The invention relates to a signal modulation device comprising a pulse width modulation module, a control module, a switching module and a feedback module, wherein the pulse width modulation module receives a data signal, and generates a first pulse width modulation signal and a second pulse width modulation signal according to the data signal and the feedback signal. The control module is electrically connected with the pulse width modulation module and generates a first switching control signal and a second switching control signal according to the first pulse width modulation signal and thesecond pulse width modulation signal. The switching module is electrically connected with the control module and outputs a driving signal to drive a load according to the first switching control signal and the second switching control signal. The feedback module is respectively electrically connected with the pulse width modulation module, the control module and the switching module, and generates and transmits a feedback signal to the pulse width modulation module according to the switching state of the switching module.

Description

technical field [0001] The invention relates to a signal modulating device and a control method thereof. Background technique [0002] Generally speaking, signal modulation devices applied to audio systems are roughly divided into class A and class AB amplifiers, which directly output analog audio signals to drive speakers. [0003] Recently, Class D amplifiers with lower power consumption have gradually replaced the applications of Class A and Class AB amplifiers. The class D amplifier mainly modulates an analog audio signal into a pulse signal, outputs a switching signal through a switching module, and then converts it into an analog driving signal through a filter to drive a speaker. With the advancement of technology, a filterless class D amplifier (class D filterless amplifier) ​​has also been developed recently, that is, a switching signal is used as a driving signal to directly drive a speaker. [0004] In switching modules for Class D amplifiers, such as figure 1 ...

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Problems solved by technology

[0011] Based on the above, in general, the switching action of the switch will cause additional switching loss, and the control method of the four-element modulation has two stages of switching, both of which control the driving signal to the third level, although the three-way modulation Meta-modulation only utilizes one-stage switching, but it still incurs switching loss

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