With the emergence of energy crisis and environmental problems, the development and utilization of new renewable energy sources have begun to attract people's attention. Among them, solar energy, as a common and easy-to-access clean energy source, has long been used in energy power generation and has gradually formed today's photovoltaic power generation industry. Photovoltaic power generation is the conversion of light energy received by solar panels into electrical energy for energy conversion. Before the current converted by the solar panel is used for use, multiple treatments and conversions are required, and the current sensor is used for monitoring and protecting the circuit in a plurality of places, and the combiner box is one of them.
In a photovoltaic power generation system, in order to increase the current and reduce the connection between the photovoltaic solar cell array and the inverter, a photovoltaic array consisting of a series of solar cells connected in series is usually connected in parallel to the combiner box, and then input to the inverter system through the controller. in. The current sensor is mainly used to measure the current of each parallel branch in the combiner box, so that it can monitor whether the working state of each photovoltaic array is normal, whether there is an open circuit condition, and prevent the current or voltage from being too large to protect the circuit.
Honeywell's CSN series closed-loop current sensors measure current magnitude based on magnetoresistance or Hall effect and zero-point balance or zero-flux methods (feedback systems). The magnetic flux in the sensor core is always controlled at zero. The amount of current required to balance the zero flux is equal to the primary current through the conductor multiplied by the turns ratio of the primary and secondary coils. Honeywell current sensor adopts through-hole design, and the output voltage is isolated from the input. It has the advantages of strong anti-overshoot capability, fast response, low energy consumption and linear output.
Shenzhen Hongjiali New Energy Co., Ltd. , https://www.hjlcharger.com