Multi-mode switching power supply and control method thereof

Abstract

The invention relates to a multi-mode switching power supply and a control method thereof. The power supply comprises an MCU main control unit, a main circuit unit, a novel transformer unit, a state detection unit, a bus control protection unit, a selective output filtering unit and a power supply and display control unit. The bus control protection unit is connected with a bus and is also connected with the main circuit unit; the MCU main control unit is connected with the power supply and display control unit, the main circuit unit, the bus control protection unit, the selective output filtering unit and the state detection unit; the state detection unit is connected with the bus control protection unit, the main circuit unit and the selective output filtering unit; the novel transformerunit is connected with the main circuit unit and the selective output filtering unit. According to the invention, the problem of restriction of a transformer framework is solved, a control circuit and a control method are optimized, and a flyback switching power supply and a forward switching power supply can be arranged in one switching power supply.

Description

technical field [0001] The invention relates to the technical field of switching power supplies, in particular to a multi-mode switching power supply and a control method thereof. Background technique [0002] With the development of power electronics technology, power modules have been widely used in various fields, and switching power supplies have gradually replaced linear power supplies and become mainstream power supplies. The power switch tube of the switching power supply is turned on and off under the action of PWM, and the bus voltage is chopped into a pulse voltage. The drive control circuit controls the duty cycle of the PWM to ensure the stability of the voltage. In small and medium power DC-DC switching power supplies, the most commonly used circuit topology is flyback switching power supply and forward switching power supply. Due to the constraints of the transformer skeleton, the control circuit and the control method are different, the flyback switching powe...

AI Technical Summary

Problems solved by technology

The switching power supply modules in the market are also classified according to the power, performance requirements and functional requirements. There is no relatively integrated switching power supply. At the same time, the existing power supplies are all fixed and cannot be used according to the application. , once a switching power supply is selected, it can only be used according to its design performance, which reduces the working efficiency of the switching power supply

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