Parallel photovoltaic charger fault management system and method

Abstract

The invention relates to a parallel connection type photovoltaic charger fault management system, which comprises one photovoltaic plate, one charging control module, one PWM (pulse width modulation) driving circuit, one backup battery, one charging main circuit, one photovoltaic voltage sampling circuit, one output voltage sampling circuit, one battery voltage sampling circuit, one fault judging and isolation control module and one output unit. The invention also provides a corresponding parallel connection type photovoltaic charger fault management method. The system and the method solve the problems that in the prior art, if one path or several paths of BUCK circuit in a photovoltaic charger system with multiple paths of BUCK circuits in parallel work fails, the system can still realize the charging, but the MPPT (maximum power point tracking) charging cannot be carried out, the energy waste is caused, and the warning cannot be provided in time.

Description

Technical field [0001] The invention relates to a fault management system and method for a parallel photovoltaic charger. Background technique [0002] The solar MPPT charger is a device that uses photovoltaic energy to charge the battery. MPPT charging is also the so-called maximum power tracking charging. When charging, the photovoltaic voltage will be at the maximum power point of the photovoltaic curve. Among them, the BUCK step-down circuit is the main topology circuit that is used more in the solar MPPT charger. At present, in order to improve the output power of the BUCK step-down photovoltaic charger, multiple BUCK circuits are directly connected in parallel. However, multiple buck circuits are directly connected in parallel. According to the characteristics of the buck circuit, when one or more buck circuits fail, such as the power switch tube of the buck circuit is broken down, the photovoltaic voltage will be instantly pulled down by the battery voltage to the same lev...

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Problems solved by technology

[0003] In view of the shortcomings of the existing solutions mentioned in the above technical background, the present invention provides a parallel photovoltaic charger fault management system and method, which solves the problem of if a certain road in the photovoltaic charger system with multiple BUCK circuits working in parallel in the prior art Or if several BUCK circuits fail, the system can still charge, but it can no longer perform MPPT (maximum power) charging, resulting in energy waste and failure to provide alarms in time

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