Boost chopper circuit and current-sharing control method thereof

Abstract

The present invention discloses a boost chopper circuit and a current-sharing control method thereof. The current-sharing control method is characterized in that a current-sharing current comparison circuit is utilized to receive a current-sharing signal and a current feedback signal of a BOOST main circuit to output a first error signal, then a superposed signal formed by the first error signal and a given voltage signal, and a voltage feedback signal of the BOOST main circuit are connected to a voltage comparison circuit to obtain a second error signal, so as to change the duty ratio of a driving square wave outputted by a PWM controller, an ON state and an OFF state of a power tube can be controlled through a driving circuit to achieve output tracking, thereby achieving the purposes of adjustable voltage and paralleled current sharing, solving the problems that a boost chopper circuit in the prior art has a fixed and non-adjustable output voltage and cannot achieve parallel operation, and achieving paralleled current sharing use to improve module capacity.

Description

technical field [0001] The invention belongs to the technical field of power supply control, and in particular relates to a step-up chopper circuit and a current sharing control method thereof. Background technique [0002] With the gradual depletion of coal, oil, natural gas and other non-renewable energy sources and the increasingly serious environmental pollution, human beings are faced with great challenges in energy and the environment. The development and application of clean renewable energy sources are increasingly being sought by scientists and Engineer's attention. As an inexhaustible clean energy, solar energy has received more attention from people. Under normal circumstances, the DC voltage level of solar panels is relatively low, and it is impossible to directly connect to the grid through the inverter link without going through the step-up link. At the same time, fuel cells have become one of the attractive new energy sources due to their advantages of clean...

AI Technical Summary

Problems solved by technology

In the step-up chopper circuit, the given signal of the PWM controller is inside the chip, which is a fixed and non-adjustable voltage signal, and only the error signal input pin is left, so the output of the main circuit can only be fixed at a certain voltage value, can not be adjusted; in addition, the circuit only provides input current control, does not take into account the current control between sub-modules when multiple sub-modules are connected in parallel, and cannot guarantee the current sharing and parallel use of each module

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