A High Linearity Hybrid Digital Pulse Width Modulator Suitable for Different Switching Frequency
A digital pulse width modulation, switching frequency technology, applied in the direction of pulse duration/width modulation, etc., can solve the problems of single application, low precision, process dependence, etc., to expand the application range, high linearity, reduce area and The effect of power consumption
Active Publication Date: 2020-03-17
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology
[0005] Aiming at the above-mentioned problems that the traditional hybrid DPWM can only be applied to a fixed switching frequency, single application, low precision, and dependent on technology, the present invention proposes a hybrid digital pulse width modulator, which can be applied to different switching frequencies and Different processes, with the characteristics of high linearity, high precision, small area power consumption, etc.
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[0045] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0046] The present invention adds a precision selection module on the basis of the traditional hybrid DPWM structure, so that the hybrid digital pulse width modulator proposed by the present invention can be applied to the s-level switching frequency, and generate corresponding pulse width modulation signals according to different switching frequencies dpwm, where s is a positive integer, can take a value according to the specific application situation. like figure 2 Shown is a schematic diagram of the overall structure of the present invention, including an accuracy selection module, a coarse adjustment module, a fine adjustment module and a digital logic module; wherein the coarse adjustment module is used to generate a count signal counter_out, and the count signal counter_out is a cycle of the switching clock si...
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A high linearity mixed digital pulse width modulator suitable for different switching frequencies belongs to the technical field of power electronics. It includes a precision selection module, a rough adjustment module, a fine adjustment module and a digital logic module. The coarse adjustment module is used to generate a counting signal, and the high x bit of the counting signal is used as a frequency detection signal. The precision selection module divides the pulse width control signal according to the frequency detection signal. It is the high-order signal and the low-order signal, and adjust the precision of coarse adjustment and fine adjustment by adjusting the digits of the high-order signal and low-order signal; then input the high-order signal to the coarse adjustment module and compare it with the count signal to obtain the coarse adjustment signal, and input the low-order signal to the fine adjustment module The tuning module performs fine tuning to obtain a fine tuning signal, and finally uses the digital logic module to generate a pulse width modulation signal as an output signal of the hybrid digital pulse width modulator according to the rough tuning signal and the fine tuning signal. The invention can be applied to different switching frequencies, and has the characteristics of high linearity, high precision, small area power consumption and the like.
Description
technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a high linearity hybrid digital pulse width modulator (Digital Pulse With Modulation, DPWM) suitable for different switching frequencies. Background technique [0002] In recent years, the research of digital switching power supply has received more and more attention and rapid development. In digital switching power supply, digital pulse width modulator (Digital Pulse With Modulation, DPWM) is driven by digital signal to generate pulse signal as a The control signal module is responsible for converting the digital signal obtained by the digital compensator into a pulse signal with a certain duty cycle, which is output to the power tube as a gate control signal to control the switching time of the power tube in the power stage, and regulates the switching time by adjusting the switching time. , and finally regulate the output voltage of the main circuit. Th...
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IPC IPC(8): H03K7/08
CPCH03K7/08
Inventor 罗萍孟锦媛郑心易彭定明
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA