Charging and discharging circuit based on switching power supply chip

• Main Authors: SHI YUANDE, ZENG GUOJING, LI DAZHUANG, ZHU YING
• Format: Patent
• Language: Chinese; English
• Published: 12.09.2023
• 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; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION; SYSTEMS FOR STORING ELECTRIC ENERGY

The utility model provides a charging and discharging circuit based on a switching power supply chip, which comprises a buck-boost circuit, and a current sampling circuit and a voltage sampling circuit for detecting charging and discharging of a battery, the buck-boost circuit comprises a switching power supply chip U3, a charging switch and a discharging switch; and the switching power supply chip is respectively connected with the current sampling circuit and the voltage sampling circuit, and generates a PWM (Pulse Width Modulation) signal for controlling the on/off of the charging switch or the discharging switch so as to control the charging and discharging power. According to the BUCK-BOOST buck-boost combined circuit provided by the utility model, the charging and discharging circuit simultaneously meets the charging and discharging functions, an independent MCU (Microprogrammed Control Unit) is not needed to control PWM (Pulse Width Modulation), and the device cost is reduced. 本实用新型提供一种基于开关电源芯片的充放电电路，包