Direct-current power supply and lithium battery power supply switching device

• Main Authors: JI CAN, LU DONGJUN, HUANG JIAFA, MENG HANMOU, HUANG MINGBO
• Format: Patent
• Language: Chinese; English
• Published: 28.01.2022
• 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; 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 discloses a DC power supply and lithium battery power supply switching device which comprises an external power supply input module, a lithium battery power supply module, a first load and a second load. The external power supply input module comprises a power supply interface and a DCDC step-down circuit; the lithium battery power supply module comprises a lithium battery interface, a charging circuit and a protection circuit; the power interface is used for being communicated with an external power supply and inputting the voltage of the external power supply to the DCDC voltage reduction circuit and the first input end of the protection circuit. The DCDC step-down circuit is used for converting an external power supply input voltage into a step-down voltage; the lithium battery interface is used for communicating with a lithium battery. The lithium battery interface can be connected with a built-in lithium battery, the lithium battery is charged when an external power supply supplies powe