What is ASEMI photovoltaic diode, the role of photovoltaic diode

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What is a photovoltaic diode and what does a photovoltaic diode do?Photovoltaic diodes include a variety of electrode tubes, each with its own role.

1. Block the diode.Blocking diodes are placed on the positive wire between the module and the battery to prevent battery current from flowing back into the PV array at night or on cloudy days, and some controllers include a diode to do this.

2. Bypass diode.Bypass diodes are placed in parallel with the components to divert current through the cell or module when shadows appear on the module.Bypass diodes are pre-wired in most assemblies.When the square array voltage is not higher than 48V, it can generally meet the requirements.In a large square array, when a string of components fails, the current of other normal components can pass through the path formed by the bypass diode, thus ensuring that the entire photovoltaic square array can still work normally.

3. Isolated diode.When the operating voltage of the square array is higher than 48V, install the isolation diode.When a string of elements or branches in the square array fails, the isolation diode can isolate the normal branch from the faulty branch, thereby preventing the current of the normal branch elements from dropping.Among them, the rated current of the diode selected by the system designer is at least 2 times the maximum current expected to pass through, and the withstand voltage of the diode can withstand at least 2 times the reverse working voltage.

Hot spot effect of photovoltaic diodes:

Shadow solar modules in the series leg will act as loads to dissipate energy from other illuminated solar modules.The shaded solar cell modules will heat up at this time, which is the hot spot effect.This effect can severely damage solar cells.Part of the energy produced by the solar cells in the light may be consumed by the cells in the shaded parts.In order to prevent the solar cell from being damaged due to the hot spot effect, it is better to connect a bypass diode in parallel between the positive and negative poles of the solar cell module to prevent the energy generated by the lighting module from being consumed by the shaded module

Bypass diode function of photovoltaic diode:

When the battery cannot generate electricity due to the hot spot effect, it acts as a bypass, allowing the current generated by other batteries to flow out of the diode, making theThe solar power generation system is able to continue generating electricity without blocking the circuit due to a problem with one unit.