CN205004824U - Photovoltaic direct current system - Google Patents

Abstract

The utility model relates to a photovoltaic power supply technical field discloses a photovoltaic direct current system, including inputing rectification return circuit, solar control ware, diode and first switch, input rectification return circuit and mains connection, the solar control ware is connected with solar panel, the output of solar control ware is connected with first switch, it is parallelly connected with the output of solar control ware that the output in input rectification return circuit passes through the diode, just the output voltage of solar control ware is greater than the output voltage in input rectification return circuit. The utility model discloses a power supply system preferential solar energy that adopts when using is supplied power, and the commercial power is automatic when solar energy powering insufficient replenishes, guarantees that the illumination lamps and lanterns reach the normal operating of relevant equipment to furthest utilizes solar energy.

Description

Photovoltaic DC power supply system

technical field

The utility model relates to the technical field of photovoltaic power supply, in particular to a photovoltaic direct current power supply system.

Background technique

In indoor places such as shopping malls, supermarkets, basements, factories, and offices, lighting is still needed indoors during the day even if the sunlight outside is strong. At present, the most widely used indoor lighting fixtures are electronic glow-type fluorescent lamps, some of them use LED energy-saving lamps for lighting, and there are also some other lamps. On the other hand, many indoor and outdoor advertising screens also need to work during the day, and these lighting fixtures and related equipment are currently powered by mains power. When the mains power is cut off, these lighting fixtures and related equipment cannot work.

Utility model content

The purpose of the utility model is to provide a photovoltaic direct current power supply system, which uses solar power firstly, and when the solar power is insufficient, the city power is automatically supplemented, thereby ensuring the normal operation of the equipment, thereby maximizing the use of solar energy.

In order to solve the above-mentioned problems, the technical solution adopted by the utility model is: a photovoltaic DC power supply system, including an input rectification circuit, a solar controller, a diode and a first switch, the input rectification circuit is connected to the mains, and the solar control The output terminal of the solar controller is connected to the first switch, the output terminal of the input rectification circuit is connected in parallel with the output terminal of the solar controller through a diode, and the output voltage of the solar controller is greater than the input voltage. The output voltage of the rectifier circuit.

According to a preferred embodiment of the present invention: the diode is a single diode or a transistor with diode characteristics.

According to a preferred embodiment of the present invention: the transistor is a MOS transistor or an IGBT.

According to a preferred embodiment of the present utility model: the output end of the input rectification circuit is connected in parallel with the output end of the solar controller through a diode, and then connected in series with a second switch.

Compared with the prior art, the beneficial effect of the utility model is that the power supply system of the utility model adopts a DC output instead of an AC when in use, and when the solar power supply is insufficient, the mains supply is automatically supplemented to ensure that lighting lamps and other office equipment normal operation, so as to maximize the use of solar energy.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a circuit diagram of the photovoltaic DC power supply system of the present invention.

detailed description

The preferred embodiments of the utility model will be described in detail below in conjunction with the accompanying drawings, so that the advantages and features of the utility model can be more easily understood by those skilled in the art, so as to make a clearer definition of the protection scope of the utility model.

Referring to Fig. 1, the utility model provides a photovoltaic DC power supply system, including an input rectification circuit, a solar controller, a diode D1 and a first switch S1, the input rectification circuit is connected to the mains, and the solar controller and The solar panel is connected, the output end of the solar controller is connected with a first switch S1, the output end of the input rectification circuit is connected in parallel with the output end of the solar controller through a diode D1, and the output voltage V2 of the solar controller is greater than Input the output voltage V1 of the rectification circuit.

In the present invention, the diode D1 is a single diode or a transistor with diode characteristics, and the transistor can be a MOS tube or an IGBT or the like.

In the utility model, the output end of the input rectification circuit is connected in parallel with the output end of the solar controller through a diode D1 and then connected in series with a second switch S2.

The principle of the photovoltaic DC power supply system of the present utility model is that: when the mains input and solar energy input are both normal, the solar panel outputs a set of DC voltage V2 through the solar controller, and the mains outputs a set of DC voltage V1 through the input rectification circuit, and the voltage V1 is connected in parallel with the voltage V2 through the diode D1. Since the designed voltage V2 is greater than the voltage V1, the power supply system only has solar output. When the load power is large or the solar energy is insufficient, the V2 voltage drops, and when it drops to V1+VD=V2 (VD is the conduction voltage drop of the diode D1), the mains and solar power supply the load together to ensure the power consumption of the load. Unaffected, but also the maximum power utilization of solar energy. And when there is no solar energy at night, the load is powered by the mains electricity completely. The output conversion of the two kinds of electric energy in the utility model is automatically completed without any time interval, so that the operation of the load is not affected.

The above-mentioned embodiment is a preferred implementation mode of the present utility model, but the implementation mode of the present utility model is not limited by the above-mentioned embodiment, and any other changes, modifications and substitutions made without departing from the spirit and principle of the present utility model , combination, and simplification, all should be equivalent replacement methods, and are all included in the protection scope of the present utility model.

Claims (4)

1. photovoltaic DC electric power system, it is characterized in that: comprise input rectifying loop, controller for solar, diode and the first switch, described input rectifying loop is electrically connected with city, described controller for solar is connected with solar panels, the output of described controller for solar is connected with the first switch, the output in described input rectifying loop is in parallel with the output of controller for solar by diode, and the output voltage of described controller for solar is greater than the output voltage in input rectifying loop.

2. photovoltaic DC electric power system according to claim 1, is characterized in that: described diode is single diode or the transistor with diode characteristic.

3. photovoltaic DC electric power system according to claim 2, is characterized in that: described transistor is metal-oxide-semiconductor or IGBT.

4. photovoltaic DC electric power system according to claim 1, is characterized in that: the output in described input rectifying loop is also connected with a second switch with after the output parallel connection of controller for solar by diode.