PWM control algorithm based on high-power buck-boost circuit

• Main Authors: DENG SHENGZHONG, CHEN CANGYI, PAN SHAOHUI
• Format: Patent
• Language: Chinese; English
• Published: 18.02.2022
• Subjects: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONTROL OR REGULATION THEREOF; CONTROLLING; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION; PHYSICS; REGULATING; SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES; SYSTEMS FOR STORING ELECTRIC ENERGY

The invention provides a PWM control algorithm based on a high-power buck-boost circuit, and the method comprises the following steps: S0, starting initialization, setting a total duty ratio variable DYTYSUB with the variation range of 0-5,000 * 1.85 in the stage of starting initialization, and additionally setting a condition DUTYOPENC for opening a C power tube with the value of 5,000 * 0.95; S1, carrying out the global scanning, and after equipment is normally started, executing a soft start process, wherein in the soft start process, DYTYSUB is slowly increased from 0 until it is found that an input source is at the maximum output power, and the current DYTYSUB value is stored as the maximum total duty ratio value corresponding to the maximum power point of the input source; S2, identifying a working mode, accurately entering a corresponding working mode according to the capability of an input power supply and the state of a battery, keeping a DYTYSUB value unchanged, and finally loading the DYTYSUB value