Power supply control circuit of 12V battery in vehicle-mounted switching power supply

• Main Authors: YANG MEIYING, LIU NIANFENG, LI HAO
• Format: Patent
• Language: Chinese; English
• Published: 22.03.2024
• Subjects: CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRIC EQUIPMENT OR PROPULSION OF ELECTRICALLY-PROPELLEDVEHICLES; ELECTRICITY; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES, IN GENERAL; GENERATION; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; PERFORMING OPERATIONS; SYSTEMS FOR STORING ELECTRIC ENERGY; TRANSPORTING; VEHICLES IN GENERAL

The utility model provides a power supply control circuit of a 12V battery in a vehicle-mounted switching power supply, a solar battery in the circuit passes through an auxiliary power supply and then is transmitted to a first input port of an LDO (Low Dropout Regulator) circuit, and voltage of the 12V battery passes through a P-type MOS (Metal Oxide Semiconductor) tube and then is transmitted to a second input port of the LDO circuit. The P-type MOS tube is used as a switch to control on and off of the 12V battery power supply control circuit, the LDO circuit outputs 3.3 V power supply voltage to the MCU, and one output port of the MCU controls the 40W detection circuit and is used for detecting the minimum output power of the solar battery; the power supply control circuit of the 12V battery in the switching power supply can control on and off of the 12V battery, avoids loss of the 12V battery caused by unnecessary on, is simple in structure, low in cost and high in practicability, and contributes to develo