PWM wave generation and duty cycle control method, device, timer and equipment

Abstract

This application proposes a pulse width modulation signal wave generation and duty ratio control method, device, timer and electronic equipment. The pulse width modulation signal duty ratio control method is applied to a timer generating a pulse width modulation signal, including: Analyze the target duty cycle to obtain the integer value and fractional value of the target duty cycle; query the preset accuracy table according to the fractional value to determine the real-time comparison value of the timer for each PWM cycle; the preset accuracy table is used to record the target duty cycle The corresponding relationship between the fractional value of the timer and the real-time comparison value of the timer; add the integer value to the real-time comparison value of each timer, and write the addition results into the comparison register of the timer respectively, so that the pulse width modulation signal The duty cycle reaches the target duty cycle. This application does not require complex calculations, the program is relatively streamlined, and the demand for MCU resources is relatively low, and high-precision control of the duty cycle can be realized at low cost.

Description

technical field [0001] The present application belongs to the technical field of DC conversion, and in particular relates to a method, device, timer and electronic equipment for generating a pulse width modulated signal (PWM wave) wave and controlling a duty cycle. Background technique [0002] At present, in wireless charging related technologies, converting direct current to alternating current is an indispensable link for wireless power transmission. For example, the process of direct current conversion by wireless power transmitter is generally through MCU (Microcontroller Unit, micro control unit), control the output pulse width modulation wave (PWM wave), and control the bridge circuit composed of MOS tube to convert direct current into alternating current , and finally transmit the transmission through the coil. Among them, the size of the PWM duty cycle will directly affect the charging power. Therefore, most of the wireless power control at this stage adopts a met...

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Problems solved by technology

[0004] With the improvement of people's quality of life, on the one hand, a wide variety of wireless charging products have appeared on the market, and the market demand for DC conversion is also increasing; on the other hand, because high-precision duty cycle control often requires more expensive and more High-frequency MCU execution increases chip power consumption at the same time. In this way, existing DC power conversion products or technologies often have low cost performance and high power consumption, and more cost-sensitive products appear, and higher costs will Greatly limit the development of such products

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