Solar photovoltaic controller

Abstract

The invention discloses a solar power photovoltaic controller, which comprises a solar battery, a system power supply, a central integration processor, a light control voltage sampling circuit, a load switch circuit and a DC load. The solar battery provides energy source for the system power supply, and doubles as a light sensor for the system. The light control voltage sampling circuit feeds solar battery collection signal to the central integration processor to control the DC load by means of light. The invention is equipped with a protective circuit to prevent reverse charge, and a light control and sensitivity adjustment circuit. The protective circuit to prevent reverse charge charges the system power supply when exposed to light, and provides a high level sensing signal for the light control and sensitivity adjustment circuit through the light control voltage sampling circuit; and prevents the power system from reversely charging the solar battery when unexposed to light, and atthe same time, provides low level sensing signal for the light control and sensitivity adjustment circuit through the light control sampling circuit. The system works reliably and stably; the range of adjustment of light control sensitivity and working hour ingress / exit point of loads is very wide; adjustment is convenient and quick.

Description

technical field [0001] The invention belongs to the field of solar power generation devices, and in particular relates to a solar photovoltaic controller that uses the photovoltaic effect of the solar battery itself to automatically realize the control of load on / off with the change of light intensity. Background technique [0002] As a new form of energy, solar energy has the characteristics of unlimited and no geographical application restrictions. It can be matched with conventional power systems and has become the first choice for developing non-polluting and sustainable new energy sources in various regions. [0003] There are still many areas in our country that are in a state of power shortage. These areas are far away from the power grid, and the power consumption is scattered. It is very difficult to connect to the grid for power generation. Especially in tourism and remote areas, it is more difficult to use electricity for lighting. The use of solar power generatio...

AI Technical Summary

Problems solved by technology

[0005] It is worth mentioning here that the known small-system solar charge controllers are less intelligent and have poor load capacity.

The light control function needs to be realized by adding an additional photodiode (photoresistor) in the control system, and the serious nonlinearity of the photodiode and the instability of performance affected by environmental factors, especially due to the small light-receiving surface of the photodiode , which is seriously affected by factors such as dust coverage, resulting in low reliability of the controller

Light control sensitivity and light control action value are difficult to achieve adjustability

At the same time, the control system does not make effective use of solar cells that are sensitive to light, have a stable response, and have a large enough light contact surface. The solar cells of high-tech products can only play the role of charging in the system, and have no effect on the light control circuit.

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