Multiphase synchronous rectification BUCK topology circuit

Abstract

The invention discloses a multiphase synchronous rectification BUCK topology circuit which comprises a main control unit and an output filtering capacitor, and each phase circuit comprises a capacitor energy storage unit, a charging power unit, a synchronous rectification unit, a drive circuit, a fly-wheel diode and an inductive energy storage unit; the main control unit is respectively connected with the drive circuit of each phase circuit, and the drive circuit of each phase circuit is connected with the synchronous rectification unit, and the charging power unit; and the input end of each phase is connected in parallel, the output end of each phase is connected in parallel and connected to the output filtering capacitor. The technical scheme of the invention is adopted, each phase BUCK circuit is independently controlled, and flow equalization adjustment is automatically performed, thus option is simpler; the topology circuit has higher conversion efficiency under the occasion of low current; and meanwhile, when one phase is in failure, other phases are not influenced, and the working state is more stable and reliable.

Description

technical field [0001] The invention relates to the technical field of photovoltaic cells, in particular to a multiphase synchronous rectification buck topology circuit. Background technique [0002] In the prior art, the circuit design of the controller usually tends to be integrated, and the current flows through a specific circuit. This kind of circuit design is more reasonable when a small current flows, the current is small and easy to control, and power tubes that withstand small heat generation are also easy to find in the market. However, as the rated current of the controller increases, this single circuit design shows many disadvantages, such as figure 1 As shown, when the rated current of the controller is large, if this scheme is adopted, it will inevitably lead to the following problems: [0003] First of all, there are certain obstacles in the selection of the power tube Q1. It is not easy to find high-current power transistors. General controllers use field...

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Problems solved by technology

However, as the rated current of the controller increases, this single circuit design shows many disadvantages, such as figure 1 As shown, when the rated current of the controller is large, if this scheme is adopted, it will inevitably lead to the following problems:

[0006] Therefore, each component of the existing conventional BUCK circuit has a relatively large energy loss, and the conversion efficiency of the entire circuit will inevitably decrease.

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