CN102520744A

CN102520744A - Thermostatic control system of photovoltaic constant temperature current transformer

Info

Publication number: CN102520744A
Application number: CN201110409720XA
Authority: CN
Inventors: 严红日; 杨孙龙; 冯士芬
Original assignee: HEFEI JUNENG NEW ENERGY TECHNOLOGY Co Ltd
Current assignee: HEFEI JUNENG NEW ENERGY TECHNOLOGY Co Ltd
Priority date: 2011-12-12
Filing date: 2011-12-12
Publication date: 2012-06-27

Abstract

The invention discloses a thermostatic control system of a photovoltaic constant temperature current transformer. The system comprises a photovoltaic assembly, a miniature current transformer and a one-chip microcomputer MCU. The miniature current transformer is installed at a backlight surface of the photovoltaic assembly. Positive and negative output terminals of the photovoltaic assembly are electrically connected with the miniature current transformer. The invention is characterized in that: a surface of the miniature current transformer is fixed with a temperature sensor, a code terminal of a semiconductor cooler is in contact with a radiating end of the miniature current transformer through heat conduction silicone grease, the temperature sensor and the miniature current transformer access the one-chip microcomputer MCU, the one-chip microcomputer MCU is connected with a control switch, the control switch is connected between the semiconductor cooler and the positive or negative output terminal of the photovoltaic assembly, and the other end of the semiconductor cooler is electrically connected with the negative or positive output terminal of the photovoltaic assembly. According to the invention, when it is ensured that a solar photovoltaic assembly always outputs maximum power, a heat radiation problem of the miniature current transformer is effectively solved, and a service life of the miniature current transformer is prolonged.

Description

A kind of thermostatic control system of photovoltaic constant temperature current transformer

Technical field:

The present invention is applied to the solar energy power generating field, particularly a kind of thermostatic control system of photovoltaic constant temperature current transformer.

Background technology:

Along with the development in solar photovoltaic technology field and national governments vigorously advocate with the Venture Capital dealer big the fund power behind the scenes under, the input of solar cell scale especially, diversification is used.The large-sized photovoltaic array of forming along with farm formula large-scale photovoltaic assembly extensively drops into construction, and the photovoltaic conversion efficiency is in urgent need to be improved.The assembled scheme that has occurred a kind of photovoltaic system just because of this in the market, miniature current transformer is installed by this system on every photovoltaic module, and every photovoltaic module is exported through unsteady flow.This system advantage is can the realizes maximal efficiency of photovoltaic module be exported, and the convenient expansion of system, easy maintenance.So become the photovoltaic construction scheme of extensive employing; But find that the too high work efficiency that causes of miniature current transformer Yin Wendu in practical application is unsatisfactory in this system in using at present; And owing to the life-span of the miniature current transformer of long-term work under the condition of high temperature also receives very big influence; The system maintenance expense raises, and has caused the waste on many manpower and materials, so the heat radiation of miniature current transformer becomes problem demanding prompt solution.We know that the thermoelectric effect of simple metal is very little, if replace metal with a N-type semiconductor and a P-type semiconductor, effect is just much bigger.After the energized, according to producing electron-hole pair near the thermoelectric effect principle upper contact cold junction, interior can reducing, temperature reduces, and the heat absorption from the external world is called cold junction.The hot junction is compound because of electron-hole pair, interior can increasing, and temperature raises, and dispels the heat to environment.Through this programme controlled active heat removal, the temperature that can keep miniature current transformer in this system is in a lower relative temperature constant state, and then above problem then can be well solved.

Summary of the invention:

Technical matters to be solved by this invention is: realize current transformer constant temperature and constant-temperature control method, to improve the output efficiency of photovoltaic module.

For achieving the above object, the technical scheme that the present invention adopts is:

The thermostatic control system of photovoltaic constant temperature current transformer; Include photovoltaic module, little shape current transformer, single-chip microprocessor MCU; Little shape current transformer is installed on the shady face of photovoltaic module; The positive and negative output terminal of described photovoltaic module is electrically connected with miniature current transformer, it is characterized in that said miniature current transformer surface is fixed with temperature sensor, and the cold junction of semiconductor cooler contacts through heat-conducting silicone grease with the radiating end of little shape current transformer; Said temperature sensor, miniature current transformer insert single-chip microprocessor MCU; Said single-chip microprocessor MCU connects a CS, and said CS is connected between the plus or minus output terminal of semiconductor cooler and photovoltaic module, and the other end of said semiconductor cooler is electrically connected with the negative or positive output end of photovoltaic module.

The thermostatic control system of described a kind of photovoltaic constant temperature current transformer is characterized in that: the cold junction of said semiconductor cooler closely contacts through the high temperature heat-conducting silicone grease with miniature current transformer radiating end.

Said miniature current transformer possesses following two kinds of functions; The one, possess the automatic MPPT maximum power point tracking function of MPPT; Guarantee too can photovoltaic module Maximum Power Output all the time; The 2nd, can be galvanic current with the unstable power conversions that solar cell produces, make things convenient for multistage interconnected between photovoltaic module.Said photovoltaic module is exported the direct current of conversion of solar energy after through miniature current transformer unsteady flow.Temperature sensor is used to measure the working temperature of miniature current transformer; The semiconductor thermoelectric refrigeration device is used to cool off the temperature of miniature current transformer, and semiconductor thermoelectric refrigeration device power supply is directly taken from photovoltaic module; CS is used to turn on and off the duty of semiconductor cooler, and CS is controlled by MCU; After temperature sensor detected miniature current transformer temperature information and passes to MCU, the MCU internal processes was judged miniature current transformer temperature, for example in MCU program inner setting semiconductor thermoelectric refrigeration device operating temperature range at 35-40 ℃; Then detect its temperature when being lower than 40 ℃; CS breaks off, and the semiconductor thermoelectric refrigeration device does not power on, and is in the state of quitting work.Be higher than 40 ℃ when temperature sensor detects its temperature, then CS is closed, and the photovoltaic panel direct current is added in semiconductor thermoelectric refrigeration device cold junction, and miniature current transformer temperature transfer is gone out in the work of semiconductor thermoelectric refrigeration device, reaches the purpose of cooling.After treating that temperature sensor detects miniature current transformer temperature once more and is lower than 35 ℃, CS breaks off, and reaches the thermostatic control to miniature current transformer thus.

Advantage of the present invention is: the present invention is guaranteeing to efficiently solve miniature current transformer heat dissipation problem in the Maximum Power Output all the time by photovoltaic module very much, thereby prolongs miniature current transformer serviceable life.

Description of drawings

Fig. 1 is a system construction drawing of the present invention.

Fig. 2 is a process flow diagram of the present invention.

Embodiment:

As shown in Figure 1, the thermostatic control system of photovoltaic constant temperature current transformer comprises photovoltaic module 100, miniature current transformer 200, temperature sensor 300, single-chip microprocessor MCU 400, CS 500, semiconductor thermoelectric refrigeration device 600.Wherein photovoltaic module 100 is a direct current with conversion of solar energy; Miniature current transformer 200 is placed in photovoltaic module 100 shady faces and is used for from motion tracking and adjusting photovoltaic module 100 output powers; And photovoltaic panel is exported unstable direct current carry out voltage stabilizing, temperature sensor 300 is used to detect miniature current transformer 200 temperature conditionss.Single-chip microprocessor MCU 400, CS 500, be used to analyze current miniature current transformer temperature and control semiconductor thermoelectric refrigeration device 600 and whether start.Semiconductor thermoelectric refrigeration device 600 power supplys are taken from photovoltaic module 100 and closely are connected with miniature current transformer 200 through the high temperature heat-conducting silicone grease.Utilize thermoelectric effect that miniature current transformer 200 internal heat are passed.

As shown in Figure 2: the constant-temperature control method process flow diagram of instance of the present invention comprises the steps:

Step 201 temperature sensor detects miniature current transformer real time temperature;

Step 202 is judged real time temperature whether in setting range, and whether promptly miniature current transformer surpasses the high temperature threshold value of setting;

When step 203 is higher than the pre-set programs high temperature threshold value when the judgement temperature, CS 500 closures, semiconductor thermoelectric refrigeration device 600 can produce powerful cooling effect take away miniature current transformer 200 internal heat;

Step 204, when cooled miniature current transformer 200 temperature were lower than the low temperature threshold value of pre-set programs, CS 500 broke off, and semiconductor thermoelectric refrigeration device 600 quits work;

Step 205, if judge when miniature current transformer 200 temperature do not surpass the pre-set programs high temperature threshold value, CS 500 can be not closed, the semiconductor thermoelectric refrigeration device is not worked.

Assembled scheme proposed by the invention; Give full play to miniature current transformer to output power of photovoltaic module from the motion tracking regulatory function, when making the latter give full play to conversion efficiency, also well solved the problems of excessive heat of miniature current transformer in this system; And pass through constant-temperature control method; On the minimum basis of semiconductor thermoelectric refrigeration device power consumption, make miniature current transformer maintain under the approximately constant temperature state, when improving the efficient of miniature unsteady flow greatly; Also effectively prolong the serviceable life of miniature current transformer, demonstrated fully the low-carbon environment-friendly theory.

Claims

1. the thermostatic control system of a photovoltaic constant temperature current transformer; Include photovoltaic module, little shape current transformer, single-chip microprocessor MCU; Little shape current transformer is installed on the shady face of photovoltaic module; The positive and negative output terminal of described photovoltaic module is electrically connected with miniature current transformer, it is characterized in that said miniature current transformer surface is fixed with temperature sensor, and the cold junction of semiconductor cooler contacts through heat-conducting silicone grease with the radiating end of little shape current transformer; Said temperature sensor, miniature current transformer insert single-chip microprocessor MCU; Said single-chip microprocessor MCU connects a CS, and said CS is connected between the plus or minus output terminal of semiconductor cooler and photovoltaic module, and the other end of said semiconductor cooler is electrically connected with the negative or positive output end of photovoltaic module.

2. the thermostatic control system of a kind of photovoltaic constant temperature current transformer according to claim 1 is characterized in that: the cold junction of said semiconductor cooler closely contacts through the high temperature heat-conducting silicone grease with miniature current transformer radiating end.