A DC step-down power supply based on energy control

Abstract

The invention discloses a DC step-down power supply based on energy control. The DC step-down power supply based on energy control comprises a main circuit and a control circuit, and the main circuitis a BUCK circuit; the control circuit comprises a signal processing circuit, a dynamic process logic determination circuit, a steady-state process control circuit, a sudden-increasing dynamic processcontrol circuit, a sudden-decreasing dynamic process control circuit, a first NOT gate circuit, a first AND gate circuit, a second AND gate circuit, a first OR gate circuit, a second NOT gate circuit, a second OR gate circuit, a third OR gate circuit, a third AND gate circuit, an isolation drive circuit, an input voltage sensor, an inductive current sensor, an output voltage sensor and an outputcurrent sensor. P and I parameter design is not needed in the controller, and the problem that parameter selection of a traditional PI controller has a large influence on performances is solved. Energy is taken as a control basis, and the energy of each link of the main circuit automatically changes when the load changes, so that the controller is high in adaptive capacity.

Description

technical field [0001] The invention relates to a DC step-down power supply, in particular to a DC step-down power supply for realizing circuit control through energy calculation, and belongs to the technical field of DC power supply. Background technique [0002] For the control problem of DC power supply, traditional control methods such as double closed-loop PI control strategy, because the design of PI parameters is based on the frequency characteristics of the system, can achieve better control effects for a certain frequency range or circuit load conditions, but when the system frequency When there is a change, the steady-state operating point changes sharply or fluctuates in a large range, there is often an overshoot or a long adjustment process in the start-up process and dynamic process of the system, and the control parameters need to be re-tuned. Contents of the invention [0003] Aiming at the above-mentioned prior art, the technical problem to be solved by the...

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Problems solved by technology

[0002] For the control problem of DC power supply, traditional control methods such as double closed-loop PI control strategy, because the design of PI parameters is based on the frequency characteristics of the system, can achieve better control effects for a certain frequency range or circuit load conditions, but when the system frequency When there is a change, the steady-state operating point changes sharply or fluctuates in a large range, there is often an overshoot or a long adjustment process in the starting process and dynamic process of the system, and the control parameters need to be readjusted

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