CN101728861B

CN101728861B - Deep discharge zero-power solar photovoltaic controller

Info

Publication number: CN101728861B
Application number: CN201010103101.3A
Authority: CN
Inventors: 董国华
Original assignee: Individual
Current assignee: MASTERLY ELECTRONICS Co Ltd
Priority date: 2010-01-25
Filing date: 2010-01-25
Publication date: 2015-03-11
Anticipated expiration: 2030-01-25
Also published as: CN101728861A

Abstract

The invention provides a deep discharge zero-power solar photovoltaic controller which comprises a solar charge circuit including a field effect tube, an accumulator battery voltage detection circuit, a solar battery voltage detection circuit, a single-chip microcomputer, a stabilized voltage supply circuit, and a switch circuit including a field effect tube, a triode and a voltage regulator diode. The controller has the function of zero power of the accumulator battery under the condition of deep discharge, not only reduces the electric energy loss of the photovoltaic controller during the operation, but also can prevent the possibility that the whole system completely loses effectiveness because the accumulator battery is over discharged, the terminal voltage is low and the single-chip microcomputer can not be operated.

Description

Deep discharge zero-power solar photovoltaic controller

Technical field

The invention belongs to a kind of electronic-controlled installation of photovoltaic generating system, be specifically related to one both power savings, avoid again crossing because of the degree of depth putting and making the photovoltaic controller of thrashing.

Background technology

Photovoltaic generating system generally has the super-charge super-discharge defencive function by chip microcontroller, when battery tension is reduced to Cross prevention point during work, cut off load, at this moment single-chip microcomputer is still in work, also namely still at consumption electric energy, therefore batteries to store energy continues to decline, terminal voltage continues to reduce, if in this case can not charge a battery in time, just likely make accumulator voltage be reduced to certain normally to work required voltage value lower than single-chip microcomputer, single-chip microcomputer is quit work, even if sunlight is strong like this, solar cell also cannot to charge in batteries, finally cause whole system function out of hand.

Summary of the invention

The deficiency of function out of hand is likely caused in order to overcome existing photovoltaic controller, the present invention proposes a kind of solar photovoltaic controller, comprise the solar recharging loop of field effect transistor, accumulator voltage detecting circuit, solar array voltage testing circuit, single-chip microcomputer, voltage-stabilized power supply circuit, comprise the switching circuit of field effect transistor, triode and voltage stabilizing didoe, this controller has the function that storage battery realizes zero-power under deep discharge conditions, decreases the electric energy loss in the photovoltaic controller course of work.

The present invention also aims to provided controller have and prevent due to storage battery over-discharge can, terminal voltage is too low and single-chip microcomputer can not be worked, and causes the generation of the possibility of whole system complete failure.

Accompanying drawing explanation

Fig. 1 is that the present invention specifically implements structural circuit figure.

Embodiment

With reference to accompanying drawing, during system works, K switch closes, if storage battery BAT terminal voltage punctures voltage stabilizing didoe ZP3 when exceeding certain set point, through resistance R15, R14 dividing potential drop makes triode Q7 conducting, field effect transistor U6 is also with regard to conducting, voltage stabilizing circuit VR1 input A and output B powers on, single-chip microcomputer U1 works, the storage battery BAT terminal voltage detected is input to single-chip microcomputer U1 port one by voltage detecting circuit J1, voltage detecting circuit J2 will detect that solar cell SOL terminal voltage is input to single-chip microcomputer U1 port 3, after calculation process, if determine, storage battery BAT terminal voltage did not reach puts point voltage, and solar cell SOL output does not have voltage, circuit normally works, after calculation process, if determine, solar cell SOL output has voltage, and storage battery BAT terminal voltage does not reach over-charge protective point, then single-chip microcomputer U1 port 2 exports as high level, triode Q3 conducting is made through resistance R4, field effect transistor M1 conducting, solar cell SOL continues charging by diode D1, field effect transistor M1 to storage battery, on the contrary, if storage battery BAT terminal voltage has reached over-charge protective point, single-chip microcomputer U1 port 2 exports as low level, triode Q3 ends, field effect transistor M1 not conducting, solar cell SOL output current is from current-limiting resistance R20, counnter attack diode D5, field effect transistor U6 internal body diodes again to the anode of battery, and direct floating charge, therefore serves over-charge protective effect.When storage battery BAT terminal voltage is lower than certain set point, though voltage stabilizing didoe ZP3 also can be breakdown, C point voltage is not enough to make triode Q7 conducting, field effect transistor U6 not conducting after resistance R15, R14 dividing potential drop, and A, B 2 do not power on, and single-chip microcomputer U1 can not work; Make voltage stabilizing didoe ZP3 can not conducting when storage battery BAT terminal voltage is low to some values further, and then triode Q7 and field effect transistor U6 can not conducting, A, B 2 electronegative potentials, single-chip microcomputer U1 quits work, whole circuit also just can not work, automatic shutdown, at this moment forms current circuit without any an element by the anode of battery and ground, so be zero current, namely zero-power when automatic shutdown.Under this automatic shutdown state, once solar cell SOL is subject to illumination produce voltage, loop is formed through current-limiting resistance R20, diode D6, resistance R26, R17, on resistance R17, dividing potential drop makes triode Q8 conducting, and then storage battery BAT and resistance R21, R11 and triode Q8 form loop, and resistance R11 has electric current, make field effect transistor U6 conducting, voltage stabilizing circuit VR1 input A and output B powers on again, and single-chip microcomputer U1 resumes work, and while charging, whole system is also just resumed work.

When K switch disconnects time, if solar cell SOL end has during illumination produce voltage, through current-limiting resistance R20, counnter attack diode D5, A, B point has voltage, and single-chip microcomputer U1 normally works, single-chip microcomputer U1 port 2 exports as high level, make triode Q3 conducting through resistance R4, field effect transistor M1 conducting, system enters charged state, therefore achieve Auto Power On, and the power consumption of system is also provided by solar cell; When solar cell SOL holds and do not have sufficiently high voltage, system stalls, storage battery BAT forms current circuit with any one element, therefore achieves automatic shutdown.Also can charge so K switch disconnects, and under automatic shutdown state, also be zero current, namely zero-power when namely not charging.

The invention has the beneficial effects as follows that photovoltaic generating system realizes automatic shutdown under the degree of depth crosses the state of putting, both saved electric energy, turn avoid to cross because of the degree of depth and put and make the possibility of system complete failure.

Claims

1. a deep discharge zero-power solar photovoltaic controller, comprise the solar recharging loop comprising field effect transistor, accumulator voltage monitoring circuit, solar array voltage observation circuit, single-chip microcomputer, voltage stabilizing circuit, comprise field effect transistor, triode and voltage stabilizing didoe are at interior switching circuit, it is characterized in that: the power input of voltage stabilizing circuit VR1 is comprised field effect transistor U6, voltage stabilizing didoe ZP3 and triode Q7 is in the control of interior switching circuit, comprise field effect transistor U6, voltage stabilizing didoe ZP3 and triode Q7 is as follows in the element annexation of interior switching circuit, voltage stabilizing didoe ZP3 negative pole connects battery positive voltage, one end of the positive pole contact resistance R15 of voltage stabilizing didoe ZP3, the other end of resistance R15 is connected with the base stage of one end of resistance R14 and triode Q7, the other end of resistance R14 is connected with the emitter of triode Q7 and one end of K switch, the other end ground connection of K switch, the collector electrode of triode Q7 is connected with one end of resistance R11, the other end of resistance R11 is connected with one end of resistance R21 and the grid of field effect transistor U6, the other end of resistance R21 is connected with the source electrode of field effect transistor U6 and battery positive voltage, the drain electrode of field effect transistor U6 is connected with the power input of voltage stabilizing circuit VR1.

2. deep discharge zero-power solar photovoltaic controller according to claim 1, it is characterized in that: its element annexation of solar recharging loop comprising field effect transistor is, the positive pole of diode D1 is connected with the positive pole of solar cell, the negative pole of diode D1 is connected with one end of resistance R12 and the source electrode of field effect transistor M1, the other end of resistance R12 is connected with one end of resistance R1 and the grid of field effect transistor M1, the other end of resistance R1 is connected with the collector electrode of triode Q3, the grounded emitter of triode Q3, the base stage of triode Q3 is connected with one end of resistance R4, the other end of resistance R4 connects the port 2 of single-chip microcomputer, one end of resistance R20 is connected with solar cell positive pole, the other end of resistance R20 is connected with the positive pole of diode D5 and D6, the negative pole of diode D5 is connected with the input of voltage stabilizing circuit VR1, the negative pole of diode D6 is connected with one end of resistance R26, the other end of resistance R26 is connected with the base stage of one end of resistance R17 and triode Q8, ground connection after the other end of resistance R17 is connected with the emitter of triode Q8, the collector electrode of triode Q8 is connected with the collector electrode of triode Q7.