Circuit with functions of preventing backflow and conducting automatic switching over power supply to achieve voltage-loss-free output

• Main Authors: LYU JINYE, CHEN HONGQI, CHEN JIAPEI
• Format: Patent
• Language: Chinese; English
• Published: 21.09.2018
• Subjects: CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION; SYSTEMS FOR STORING ELECTRIC ENERGY

The invention discloses a circuit with functions of preventing backflow and automatically switching over a power supply to achieve voltage-loss-free output, and belongs to the technical field of electronics. The circuit comprises a first power supply side, a second power supply side, power supply equipment and a circuit body for automatically switching over the power supply to achieve voltage-loss-free output; the circuit body for automatically switching over the power supply to achieve voltage-loss-free output comprises a voltage reduction device U2, a field effect tube Q1, a field effect tube Q2 and a field effect tube Q3; a positive electrode of the first power supply side is connected with the output end of the U2, the voltage output end of the U2 is connected with the power supply equipment and a drain electrode of the Q1 separately, the grounded end of the U2 is connected with a drain electrode of the Q3, and a source electrode of the Q3 is grounded; a grid electrode of the Q3 isconnected with a grid el