CN201119070Y

CN201119070Y - Efficient LED solar lamp controller

Info

Publication number: CN201119070Y
Application number: CNU200720128001XU
Authority: CN
Inventors: 耿华; 郭希铮; 王飞
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-08-02
Filing date: 2007-08-02
Publication date: 2008-09-17
Anticipated expiration: 2017-08-02

Abstract

The utility model discloses a highly efficient LED solar energy lamp controller, which comprises a signal processing and AD sampling circuit, a main circuit, a human-computer interface circuit and a microprocessor, wherein, the signal processing and AD sampling circuit is responsible for converting terminal voltage signals, charging current signals, discharging current signals and temperature signals, etc. of a solar panel and an accumulator into digital signals to be transmitted into the microprocessor after being modulated; the main circuit is composed of a timesharing multiplexing Buck-Boost bi-directional DC-DC convertor, a current sampling circuit, a driving circuit of a power tube and a charging and discharging change-over circuit, so as to realize the charging of the accumulator and the discharging of the LED lamps; the human-computer interface circuit is used as the operating interface of a controller and users to respond to the operation information of the users; the microprocessor responsible for the coordination control of the whole system and comprises maximum power charging control, LED lamp impulse discharging control and operation response of the users and system protection.

Description

Efficient LED solar lamp controller

Technical field:

The utility model relates to a kind of efficient LED solar lamp controller, belongs to electronic technology field.

Background technology:

Along with the energy-conserving and environment-protective idea deeply and the development of photovoltaic technology, solar illuminating system more and more is applied to each occasions such as street, garden, tunnel.LED is as a kind of environmental protection DC light source, and, advantages such as response speed fast, low-power consumption long with its life-span are subject to the people's attention, and are widely used in the solar illuminating system.

Controller is LED solar energy lamp " heart ", directly determines its operating efficiency and performance.At present, known LED solar lamp controller has time control and light control functionality, and charging modes is directly charging, and type of drive is directly to drive or pulsed drive.Directly charging modes directly links to each other cell panel with storage battery when solar cell panel voltages is higher than battery tension; Directly drive and utilize storage battery that the LED solar energy lamp is directly powered, need be in circuit series limiting resistor, reduced system effectiveness; Pulsed drive is utilized the characteristics of luminescence of LED, has increased the DC-DC converter in circuit,, has reduced system loss, and can obtain higher brightness when its average current that passes through is identical with direct current the power supply of LED solar energy lamp with pulse mode.

Usually, the power output of solar panel and its terminal voltage are parabolic relation, and change along with light intensity and temperature, and directly under the charging modes, the cell panel terminal voltage is clamped about 12V by storage battery, is not utilized; For improving charge efficiency, need between cell panel and storage battery, add the DC-DC converter, according to real-time cell panel power characteristic, control its terminal voltage, realize the maximum power output of cell panel, yet because circuit and control are higher than complexity, cost, how existing LED solar lamp controller does not adopt.

Summary of the invention:

The utility model is intended to propose a kind of novel efficient LED solar lamp controller, utilize the power-on time of LED solar energy lamp and interlocking of charge in batteries time, the same Buck-Boost bidirectional DC-DC converter of time-sharing multiplex is realized the maximum power output of solar panel and the pulsed power supply of LED solar energy lamp simultaneously; In addition, this controller can be set according to battery capacity and user, adjusts LED solar energy lamp luminosity automatically, realizes the efficient operation of system.

The purpose of this utility model is achieved in that a kind of efficient LED solar lamp controller, comprise signal processing and AD sample circuit, main circuit, man-machine interface circuit and microprocessor, be converted to digital signal after terminal voltage signal, charging current signal, discharging current signal and the temperature signal modulation of described signal processing and AD sample circuit and send into microprocessor solar panel and storage battery; Described main circuit is by the Buck-Boost bidirectional DC-DC converter and discharge and recharge switching circuit and forms, and realization is to the charging of storage battery with to the discharge of LED light fixture; Described man-machine interface circuit is controller and user's a operation-interface, response user's operation information; Described microprocessor is responsible for the coordination control of whole system, comprise discharge and recharge control, the user operates and responds and system protection.

Current sampling circuit in above-mentioned signal processing and the AD sample circuit is the time-sharing multiplex circuit; Buck-Boost bidirectional DC-DC converter in the above-mentioned main circuit is the time-sharing multiplex circuit.

The beneficial effects of the utility model are:

1. adopt the DC-DC converter to change the solar panel terminal voltage, storage battery is charged, can improve the utilance of solar panel and the charge efficiency of system, thereby prolong the power-on time of LED solar energy lamp.

2. adopt pulse mode to the power supply of LED solar energy lamp, can on the basis that keeps its brightness, reduce its loss, reach purpose of energy saving; Set according to remaining battery capacity and user, dynamically adjust the brightness of LED solar energy lamp, the power-on time that can prolong storage battery is protected storage battery effectively.

3. same Buck-Boost bidirectional DC-DC converter of time-sharing multiplex and current sensor are realized the management of charging and discharging of LED solar energy lamp having improved system effectiveness, have reduced hardware cost.

Description of drawings:

Fig. 1 is an efficient LED solar lamp structure chart of the present utility model.

Fig. 2 is a LED solar lamp controller main circuit schematic diagram of the present utility model.

Fig. 3 is a microprocessor program flow chart of the present utility model.

Embodiment:

Fig. 1 is the efficient LED solar lamp structure chart.Form by solar panel 1, controller 2, storage battery 3 and LED light fixture 4.Controller 2 comprises microprocessor 5, signal processing and AD sample circuit 6, main circuit 7 and man-machine interface circuit 8.

Solar panel 1, storage battery 3 and LED light fixture 4 all link to each other with controller 2.Microprocessor 5 links to each other respectively with signal processing and AD sample circuit 6, main circuit 7 and man-machine interface circuit 8 as the core of controller 2.Signal processing and AD sample circuit 6 are converted to digital signal after with modulation such as current signal in the terminal voltage signal of solar panel 1 and storage battery 3, charging current signal, the LED light fixture 4 and temperature signals and send into microprocessor 5.Main circuit 7 is by the Buck-Boost bidirectional DC-DC converter and discharge and recharge switching circuit and forms, and realization is to the charging of storage battery with to the discharge of LED light fixture.Man-machine interface circuit 8 is operation-interfaces of controller and user, and response user's operation information is as LED power-on time, power supply brightness etc.Microprocessor 5 is judged current system operation situation according to the digital information of signal processing and 6 detections of AD sample circuit, as if being in daytime and can charging normal, then controlling 7 pairs of storage batterys of main circuit charges, and variation relation according to power output He its terminal voltage of solar panel, judge whether it is in maximum power point (mpp), by the duty ratio of judged result variable step ground change DC-DC converter, realize the maximum power charging of solar panel; If be in night, then control main circuit 7 the Buck-Boost bidirectional DC-DC converter is switched to discharge loop to the power supply of LED light fixture, detect the electric current that flows through LED simultaneously, dynamically adjust the duty ratio of DC-DC converter, realize the constant current control of LED light fixture, it is constant to keep its brightness; Simultaneously, microprocessor 5 is judged the residual capacity of storage battery according to the rate of change of accumulator voltage in the unit interval, when residual capacity is low, reduces the duty ratio to the DC-DC converter of LED light fixture power supply, and this moment, LED brightness reduced, and power consumption reduces; Also can set, the control LED light fixture operating time, and behind setting-up time, recently reduce the brightness of LED light fixture, the power-on time that prolongs storage battery by the duty that reduces the DC-DC converter according to the user.

Fig. 2 is a LED solar lamp controller main circuit schematic diagram, is a design example of efficient LED lamp controller main circuit.

The positive and negative terminal PV+ of solar panel, PV-is through behind the anti-recoil diode D1, with by Mos pipe Q1, Q3, the bi-directional DC-DC Buck-Boost converter that inductance L 1 is formed links to each other, the other end of DC-DC converter and accumulator positive negative terminal BAT+, and BAT-links to each other, by to Q1, the control of the break-make of Q3 realizes solar panel maximum power output control; Diode D2 and fuse FUSE1 have constituted electricity storage preventing pond reversal connection circuit; The positive and negative terminal LED+ of LED light fixture, LED-is through managing Q2 by Mos, Q3, bi-directional DC-DC Buck-Boost converter and accumulator positive negative terminal BAT+ that inductance L 1 is formed, BAT-links to each other, wherein, and Q3, L1 is for discharging and recharging the time-sharing multiplex circuit, and Q2 turn-offs during charging, and Q1 turn-offs during discharge; C1, C2, C3 are filter capacitor; Current sample coil Sam1 and sampling resistor R2 have constituted current sampling circuit, and this circuit also is a time-sharing multiplex, sample respectively when discharging and recharging charging current and discharging current, and sampled signal is sent into signal processing and the AD sample circuit 6 among Fig. 1; Resistance R 5, R7, R11, R12, R15, R16, triode Q4, Q6 have constituted the drive circuit of Q2, and the break-make of Q2 is by control signal LEDconIN control, and control signal LEDconIN is from microprocessor; Resistance R 1 is the surge absorption resistance of Q2; D3 can accelerate the shutoff of Q2 for the anti-saturated zener diode of Q2 conducting; Equally, resistance R 8, R10, R17, R18, R19, R20, triode Q7, Q9 have constituted the drive circuit of Q1, and the break-make of Q1 is by control signal ChargeIN control, and control signal ChargeIN is from microprocessor; Resistance R 6 is the surge absorption resistance of Q1; D4 can accelerate the shutoff of Q1 for the anti-saturated zener diode of Q1 conducting; Resistance R 3, R4, R9, R14 triode Q5, Q8 has constituted the drive circuit of Q3, and the break-make of Q3 is by control signal DisChargeIN control, and control signal DisChargeIN is from microprocessor; Resistance R 13 is the surge absorption resistance of Q3; D5 can accelerate the shutoff of Q3 for the anti-saturated zener diode of Q3 conducting; During charging, microprocessor is by control signal ChargeIN and DisChargeIN control Q1, and the break-make of Q3 realizes the solar panel terminal voltage, realizes the maximum power charging, and this moment, LEDConIN was a low level, and Q2 turn-offs; During discharge, microprocessor is by control signal LEDConIN and DisChargeIN control Q2, and the break-make of Q3 realizes the pulsed power supply of LED light fixture, and this moment, ChargeIN was a low level, and Q1 turn-offs;

Fig. 3 is the microprocessor program flow chart, is a design example of efficient LED lamp controller microprocessor software flow process.

Fig. 3 (a) is the global procedures flow chart, and subprogram, night are handled subprogram, idle condition handles subprogram and various Timing Processing subprogram is formed by handling on defined variable, initialize routine, clear house dog subprogram, daytime.Wherein, handle the charging control that subprogram realizes the storage battery on daytime daytime; Handle the control that the LED light fixture is lighted in the subprogram realization night night; Idle condition handle subprogram realize night the LED light fixture finish setting-up time illumination back to daytime during this period of time etc. to be controlled; Various Timing Processing subprograms are finished functions such as LED lamp lighting time Timing Processing, other times Timing Processing.

Fig. 3 (b) is the subroutine flow chart on daytime, is made up of AD sampling subprogram, maximum power charging control subprogram and PWM output subroutine.Wherein AD sampling subprogram is finished the sampling of solar panel terminal voltage, accumulator voltage, charging current, ambient temperature; If satisfy charge condition (the solar panel terminal voltage is higher than accumulator voltage), the maximum power charging control program calculates the variation relation of power output and its terminal voltage of solar panel according to sampled value, judge whether it is in maximum power point (mpp), calculate the duty ratio of PWM by judged result variable step ground; The PWM output program then drives Q1 according to the duty ratio output pwm signal that calculates, and Q3 realizes the maximum power charging of solar panel.

Fig. 3 (c) is the subroutine flow chart at night, is set by AD sampling subprogram, remaining battery capacity judgement subprogram, user and judges that subprogram, timer setting subprogram, LED constant current output control subprogram, PWM output subroutine and PWM turn-off subprogram and form.AD sampling subprogram is finished the sampling of accumulator voltage, discharging current, ambient temperature; Remaining battery capacity is judged the rate of change of subprogram according to unit discharge accumulator voltage in the time, judges the residual capacity of storage battery, when residual capacity is low, reduces the brightness of LED lamp lighting is reduced system power consumption; The user sets lighting hours and the reduction brightness of illumination time of judging that subprogram judges that the user sets; Timer is set subprogram and is provided time reference for the illumination that realizes the stipulated time; LED constant current output control subprogram is dynamically adjusted the PWM conducting duty ratio of DC-DC converter according to the discharging current sampled value, and it is constant to keep discharging current, keeps the brightness of illumination of LED light fixture; The PWM output subroutine drives Q2, Q3 according to the duty ratio output pwm signal that calculates; When the regulation lighting hours arrives, turn-off subprogram by PWM and turn-off the PWM drive signal, extinguish the LED light fixture.

Claims

1. efficient LED solar lamp controller comprises with the lower part:

Signal processing and AD sample circuit, main circuit, man-machine interface circuit and microprocessor;

It is characterized in that, be converted to digital signal after terminal voltage signal, charging current signal, discharging current signal and the temperature signal modulation of described signal processing and AD sample circuit and send into microprocessor solar panel and storage battery; Described main circuit is by the Buck-Boost bidirectional DC-DC converter and discharge and recharge switching circuit and forms, and realization is to the charging of storage battery with to the discharge of LED light fixture; Described man-machine interface circuit is controller and user's a operation-interface, response user's operation information; Described microprocessor is responsible for the coordination control of whole system, comprise discharge and recharge control, the user operates and responds and system protection.

2. efficient LED solar lamp controller according to claim 1 is characterized in that, the current sampling circuit in described signal processing and the AD sample circuit is the time-sharing multiplex circuit.

3. efficient LED solar lamp controller according to claim 1 is characterized in that, the Buck-Boost bidirectional DC-DC converter in the described main circuit is the time-sharing multiplex circuit.