CN1787717A - Solar energy high voltage sodium lamp controller based on single stage inverter - Google Patents
Solar energy high voltage sodium lamp controller based on single stage inverter Download PDFInfo
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- CN1787717A CN1787717A CNA2005100869183A CN200510086918A CN1787717A CN 1787717 A CN1787717 A CN 1787717A CN A2005100869183 A CNA2005100869183 A CN A2005100869183A CN 200510086918 A CN200510086918 A CN 200510086918A CN 1787717 A CN1787717 A CN 1787717A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
Abstract
This invention relates to a solar energy high pressure Na-lamp controller based on a single stage inverter characterizing in applying a sectional charge control and a frequency conversion output control, in which, the hardware includes a singlechip control circuit, a single-stage total bridge inversion circuit, a storage battery charge circuit, a high frequency electronic ballast circuit, a solar energy cell, storage batteries and luminaries, the controller is charged by MPPT to increase the system efficiency and applies frequency conversion output to control the current of the lamp, besides, a design of machine-card separation is applied to the controller on the structure to meet the needs of different luminaries and lamination, the control structure is integrated in a control card suitable for software upgrading.
Description
Technical field
The invention belongs to power electronics application technology and new forms of energy and use technical field of power generation, especially be useful in the solar energy high voltage sodium lamp illuminator, extensively be used in municipal works, intelligent lighting control, intelligent charge and energy management, requirement such as energy-efficient are satisfied in road, garden illuminating lamp place.
Background technology
At present, in the photovoltaic generation application system, adopting high-voltage gas discharging light to realize the photovoltaic illumination, is one of photovoltaic lighting technology that is most widely used.And problems such as in the prior art, photovoltaic lighting system mainly has solar cell working efficient and the system capacity transfer ratio is general lowly, life of storage battery weak point, system's fluctuation of service.And adopt the single stage type inversion, and owing to have only an energy conversion link in the system,, also to guarantee amplitude and sinusoidal degree simultaneously to the load end electric current so should consider tracking solar battery maximum power point during control, control is comparatively complicated.The photovoltaic generating system of practical application at present adopts the still rare of this topological structure, and it is just rare more to be used for the single stage type of solar illuminating system.But along with modern power electronics technology and digital signal processing technology rapid development, the control difficulty that system topology causes is overcome gradually, and the stage photovoltaic single electricity generation system has become a research focus in domestic and international photovoltaic application field.
In addition, the energy management in the solar energy high voltage sodium lamp control also is a key issue.Good photovoltaic system should possess following at least three aspects: one, how the control that energy flows to realizes that promptly the solar battery array DC side is to accurate charging voltage, the Current Control of DC load (storage battery) and how to realize that the storage battery DC side presents to the regulated power of AC side load (high-pressure sodium lamp); Two, how the affirmation of photovoltaic system working point guarantees that promptly system is in service, and solar array always works in its maximum power point, realizes the maximum output of system.Three, how the high-quality inversion problem of the electric energy from the storage battery DC side to AC side promptly designs, selects inversion link topology and control strategy thereof, guarantees higher power factor in the inversion.
Summary of the invention
In order to solve the variety of issue that above-mentioned photovoltaic lighting system exists, the present invention proposes a kind of novel solar energy high voltage sodium lamp intelligent controller based on the single stage type inverter.Controller has been realized different operating State Control and storage battery energy intelligent management, has satisfied the stable operation of solar illuminating system under the different operating state and the requirement of accurately switching.
Receive lamp controller based on the solar-powered high-pressure of single-stage inverter, it is characterized in that this controller contains: solar panel, storage battery, State Control part, charging control section branch, discharge control section and controlling object high pressure sodium lamp, wherein:
The State Control part comprises single-chip microcomputer or DSP control circuit, Hall current, voltage sensor and PWM chip for driving, wherein:
The Hall voltage transducer, is gathered the voltage of described solar panel and storage battery respectively by totally two;
Hall current sensor, is gathered the electric current of described solar panel and storage battery respectively by totally two;
Contain singlechip chip or dsp chip on the single chip machine controlling circuit, A/D, and programmable logic device, transceiver and toggle switch, single-chip microcomputer or DSP export three road pwm signals and state control signal as calculated, toggle switch on this single-chip microcomputer or the DSP control circuit links to each other with single-chip microcomputer by transceiver, is used for lighting hours and lighting system are carried out the artificial setting of parameter;
The PWM chip for driving, this chip receives single-chip microcomputer and sends three road pwm signals, through this chip conversion, power output PWM drive signal, driving power MOSFET pipe;
The charging control section branch is a battery charging circuit, and this battery charging circuit is by power MOSFET tube, fast recovery diode D, inductance L
1The DC chopper circuit that has filter capacitor that constitutes, the output of the solar cell behind its input termination capacitor filtering, the output termination storage battery of battery charging circuit, the voltage of solar panel and storage battery, current signal are sent into above-mentioned single-chip microcomputer through described voltage, current sensor, A/D converter, single-chip microcomputer or DSP calculate the peak power output of solar cell through first difference method, output pwm signal, manage through said PWM chip for driving driving power MOSFET, regulate duty ratio, to described charge in batteries, realize the MPPT maximum power point tracking function;
The discharge control section contains single stage type DC-DC full bridge inverter, high-frequency step-up transformer, high pressure sodium lamp starter and high-frequency electronic ballast unit, wherein:
Single stage type DC-DC full bridge inverter adopts resistance by 4, electric capacity, the power MOSFET tube of the absorption circuit that diode constitutes constitutes, in this inverter, the DC side power supply is provided by storage battery, storage battery side filter capacitor in parallel, the voltage of storage battery, current signal is through described voltage, current sensor, A/D converter is sent into above-mentioned single-chip microcomputer, single-chip microcomputer is two road variable pwm signals of output frequency as calculated, be given to the power MOSFET tube grid through described PWM chip for driving, by changing reverse frequency, thereby change the ballast reactance, control high pressure sodium lamp dividing potential drop realizes output voltage, controlled current and power saving function.
High-frequency step-up transformer, the inversion side of the described DC-DC inverter of former edge joint of this high-frequency step-up transformer, high-frequency step-up transformer is output as the high-frequency and high-voltage square-wave voltage;
Starter and high-frequency electronic ballast unit comprise: voltage-multiplying circuit, starter discharge circuit, ballast inductance T1 and current detection circuit, wherein:
The electric ballast unit is ballast inductance T1, current transformer T2 in this ballast inductance T1 and the current detection circuit and high pressure sodium lamp series connection inverter outlet side;
Voltage-multiplying circuit is directly from the power taking of inverter outlet side, the output termination starter discharge circuit of voltage-multiplying circuit;
The starter discharge circuit is by R1, C1, R2, C2, controllable silicon and puncture pipe constitute, R1 and C1 constitute charge circuit and are attempted by the voltage-multiplying circuit positive and negative end, R2, the former limit series connection of C2 and ballast inductance constitutes the electric capacity charge circuit and also is attempted by the voltage-multiplying circuit two ends, the controllable silicon positive pole connects capacitor C 2 positive poles, the controllable silicon negative pole connects the voltage-multiplying circuit negative pole, puncture the anodal and controllable silicon gate pole of pipe two termination C1, after the charging voltage of C1 equals to puncture the puncture voltage of pipe, puncture the pipe conducting, the C1 discharge, the conducting electric current injects the controllable silicon gate pole, the controllable silicon conducting, then by controllable silicon, the loop discharge that the former limit of C2 and ballast inductance constitutes then can induce the above high pressure of 3000V, with the lamp starter on the T1 secondary winding of ballast inductance;
Current detection circuit is made of current transformer T2, R3, D3, C3 and power MOSFET tube, the rectification circuit that T2 secondary parallel resistance R3 and D3, C3 constitute, power MOSFET tube drains and connects the C1 positive pole, source electrode connects the C1 negative pole through resistance R 4, grid connects the C3 positive pole, behind the lamp starter, then flow through electric current among the T2, the T2 secondary has induced current, be transformed to voltage signal through R3, the rectification circuit that constitutes through D3, C3 is delivered to the power MOSFET tube grid, conducting MOSFET again, thereby bypass charging capacitor C1 closes the starter discharge circuit.
Described single chip machine controlling circuit and above-mentioned other circuit adopt separation between machine and card formula structure, and single chip machine controlling circuit is made control card, and control card is connected by slot with circuit board.
The present invention is used for solar energy illumination intelligence control system at special the adaptation.By the operational mode and the operational factor of software programming control controller, not only can realize the Based Intelligent Control of solar lighting, to improving the stability of system, charging and discharging of accumulator ability and useful life all are significantly improved and improve simultaneously.Because improved charging and discharging of accumulator control strategy and the solar illuminating system that has cooperated the single stage type inverter, the efficient of system obviously improves.
Description of drawings
The present invention is further described below in conjunction with drawings and Examples:
Fig. 1 is an overall circuit schematic diagram of the present invention;
Fig. 2 is the live part circuit theory diagrams of the embodiment of the invention;
Fig. 3 is power supply (illumination) the partial circuit schematic diagram of the embodiment of the invention;
Fig. 4 is the circuit of electronic ballast schematic diagram of the embodiment of the invention;
Fig. 5 is the control board circuit diagram of the embodiment of the invention;
Fig. 6 is the power unit circuit diagram of the embodiment of the invention;
Embodiment
The solar energy high voltage sodium lamp illuminator is made up of following several parts: solar cell, storage battery, charging-discharging controller and lighting.In system's running, to the collection of solar cell and storage battery and light fixture electric weight, judge that through the single-chip microcomputer computing running status of control system is carried out energy management by constantly.System's operation comprises charging, lights a lamp, and waits for links such as time-delay.Its technical characterictic is: 1) by voltage, the electric current of sampling solar cell and storage battery and light fixture, realize the automatic control and the Based Intelligent Control operation of system.(Maximum Power PointTracking MPPT) absorbs solar power to greatest extent to use the MPPT maximum power point tracking technology in the charging link; Adopt the syllogic charging technique to guarantee the life-span and the charge volume of storage battery.2) voltage, the electric current by sampling solar cell and storage battery and light fixture, in the discharge link, adopt frequency conversion output and permanent power control strategy, by the by-pass cock frequency, control ballast and high-pressure sodium lamp voltage ratio, thereby reach the purpose of high-pressure sodium lamp controlled current, realize high-pressure sodium lamp Energy Saving Control and dimming function.3) adopting single stage type full-bridge DC-AC inverter in hardware designs, is the light fixture power supply by the high frequency transformer boosted voltage again.Discharge (power supply) circuit adopts the power supply design of no industrial frequency transformer, replaces the Industrial Frequency Transformer of volume heaviness, realizes voltage transitions and isolation, improves conversion efficiency.4) adopt high-frequency electronic ballast, cooperate single stage type inverter and high frequency ballast to realize the normal build-up of luminance of high-pressure sodium lamp; When the light fixture steady operation, also play the effect of ballast inductance.5) the split plug in construction is adopted in the design of control board and main circuit board, realizes smart card designs, can realize design again to control card easily, satisfies requirements of different users, has reduced construction cycle and cost.(for example: be core Philip P89C51 series etc.), modulus conversion chip, and logical transition chip and toggle switch cooperate and finish artificial parameter setting and logic determines with single-chip microcomputer on the control card.
Control thought to lamp current and power output among the present invention is: because the existence of ballast inductance is arranged, therefore by the change output frequency, thereby change the ballast reactance, and then change the electric light dividing potential drop, reach the purpose of output voltage, controlled current.The specific implementation method that becomes switching frequency control high-pressure sodium lamp electric current into: control system constantly detects the output voltage and the output current of storage battery, sample by AD, feed back to single-chip microcomputer, single-chip microcomputer compares by sampled value and specified set point, provide the instruction that changes frequency, provide the change amount of frequency simultaneously, it is controlled to reach power output.When battery tension descends or lamp current when reducing, reduce switching frequency, the ballast dividing potential drop is reduced, guarantee the constant current of lamp, realized the closed-loop control of high-pressure sodium lamp electric current, experiment shows that the outputting current steadily of inverter is near the high-pressure sodium lamp output-current rating.
The control transformation of system of the present invention different operating state and storage battery energy management are realized by SCM Based control circuit.Its control signal is solar cell output voltage and current signal.Under the daylight condition, control circuit detects solar cell normal output, then opens charging circuit, closes discharge circuit, and system works is under charged state.After the darkness, the solar cell output voltage is reduced to below the setting threshold, and this moment, control circuit charge closing circuit was opened discharge circuit, system's powered lighting.State control circuit is avoided misoperation by charging, power supply state interlocking, guarantees the stability of illuminator work.Control circuit has also been realized the timing startup and the closing function of lighting load.Energy management module prevents to overcharge of a battery and deep discharge that by the working method of monitoring system operating state and statistics accumulator electric-quantity selective system the As soon as possible Promising Policy lighting demand is realized conditioning function simultaneously.Lighting hours can be set the longest time of lighting a lamp by toggle switch, satisfies the time requirement of lighting a lamp under experimental condition and the different sunshine conditions.
The charge in batteries strategy that controller of the present invention uses has been taked to fill soon, has been overcharged, the charging method in 3 stages of floating charge.
1) fill the stage (MPPT CHARGE) soon: the electric current ability to accept of storage battery is greater than the fan-out capability of solar cell behind charging circuit.Therefore, only consider how to realize the maximum power point output of solar cell.Therefore, realize the single order tracking of solar cell maximum power point by controller.
2) overcharge the stage (OVER CHARGE): charging circuit provides a high voltage V to storage battery
OC, detect charging current simultaneously.When dropping to, charging current is lower than change-over gate limit value I
OCTThe time, think that accumulator electric-quantity is full of, charging circuit forwards the floating charge stage to.
3) the floating charge stage (FLOAT CHARGE): the charging current accumulators provides a suitable float charge voltage V
F
Adopt the syllogic charging modes, can be effectively, the use storage battery of science, improve the service efficiency of storage battery, the useful life of prolongation storage battery.
Fig. 1 is an overall circuit schematic diagram of the present invention.State control system (data sampling cooperates the single-chip microcomputer logic determines) passes through the collection to the electric current and voltage amount of solar panel and storage battery.In the sampling process of system, because sampling quantity is the forceful electric power signal, can not directly gather sampling quantity with the A/D sampling A, therefore need to select suitable voltage, current sensor to cooperate the work of A/D sampling A.In the present invention, select Hall voltage transducer VSM series and Hall current sensor CSM series, cooperate high-speed a/d chip operation (for example MAX197) as sensing device.The single-chip microcomputer that sampled signal is sent into control card calculates and relatively provides system's charging or the instruction of lighting a lamp.Detect simultaneously constantly the electric current and voltage amount of solar panel and storage battery, the output of the maximum power point of solar panel and frequency conversion output and brightness adjustment control when lighting a lamp when guaranteeing charging.
Fig. 2 is the live part circuit theory diagrams of the embodiment of the invention.Charging circuit is power supply with the solar cell, and storage battery is load.Solar battery array open circuit voltage V
O, maximum power point voltage is about V
MSwitching device is selected power MOSFET among the present invention.For guaranteed capacity and reduction power consumption, use 2 parallel connections, and adopt RCD to absorb circuit.By the sampling to the electric current and voltage amount of solar panel and storage battery, the output pwm pulse changes the duty ratio of charging circuit, thus the maximum power point output of control solar panel.
Fig. 3 is power supply (illumination) the partial circuit schematic diagram of the embodiment of the invention.DC/DC module among the figure adopts the high frequency booster circuit of full bridge structure to realize.Control strategy is: the change switching frequency control that employing proposes above.DC side calculates required reverse frequency by constantly detecting busbar voltage and power output, provides pwm signal by single-chip microcomputer, by pwm chip (for example: IR2110) produce gate pulse.The output of 2 tunnel pulsewidths drives 4 power MOS pipes of full-bridge respectively, and inversion goes out high-frequency alternating current, obtains the hf and hv pulse square wave after high frequency transformer boosts.Power MOSFET tube adopts the absorption circuit that is made of resistance, electric capacity, diode, adds filter capacitor simultaneously between dc bus, has improved the quality of electric energy, has reduced switching loss.
Fig. 4 is the circuit of electronic ballast schematic diagram of the embodiment of the invention.The operation principle of high-frequency electronic ballast is as follows: after electric ballast feeds high frequency square wave voltage, voltage-multiplying circuit is by the high frequency square wave voltage power taking, generation is three times in the voltage of Inverter Square Wave amplitude, voltage charges to C1 by the R1 charging paths that constitutes of connecting with C1, after the voltage of C1 equaled to puncture the puncture voltage of pipe, it was logical to puncture pipeline, the C1 discharge, the conducting electric current injects controllable silicon gate pole, controllable silicon conducting.Utilize C1 and R1 to adjust time constant, then can on the coil of ballast inductance T1 coupling, add the DC pulse of Fixed Time Interval, on the T1 winding, induce the above high pressure of 3000V, the lamp starter.After lamp was lighted, current inductor T2 induction high-pressure sodium lamp electric current produced current detection signal, and electric current charges to C2, and the conducting power MOSFET turn-offs the starter discharge circuit.The high frequency magnetic core coiling is adopted in the ballast inductance.By improving reverse frequency at 50 ~ 100kHz, exceed audiorange, the inductance value of the required ballast of high-pressure sodium lamp reduces greatly on the one hand, thereby has reduced volume and loss, has also eliminated noise pollution on the other hand.
Fig. 5 is the control board circuit diagram of the embodiment of the invention.Control circuit board is by single-chip microcomputer, crystal oscillator, the A/D chip, transceiver (for example: 74LS245), monitoring chip, programmable logic chip (for example: GAL), compositions such as toggle switch.The main circuit direct current, the voltage of AC side, electric current and ballast electric current be totally 5 tunnel sampled result, send into control board through flat cable terminal, MAX197 carries out the A/D conversion to sampled result, result after the conversion is sent into single-chip microcomputer to be handled, single-chip microcomputer is finished the controlled function of inverter current tracking and MPPT maximum power point tracking according to the control strategy of setting, its control is output as three the road and drives triggering signal, wherein two-way is that full-bridge inverting drives, one the tunnel is that charging circuit drives, drive triggering signal and carry out logical checking through programmable logic chip, pipe is straight-through up and down to prevent full-bridge on the one hand, on the other hand interlocking is carried out in charging and inversion.
Fig. 6 is the power module circuitry schematic diagram of the embodiment of the invention.The power supply of solar street light adopts single-ended flyback PWM type Switching Power Supply (for example: adopt UC3842 to combine with high frequency transformer), UC3842 is the feedback voltage of the sampling of output voltage as the PWM controller, this feedback voltage is behind the error amplifier of PWM controller inside, and the duty ratio of adjusting switching signal is to realize the stable of output voltage.When output voltage raise, the induced voltage that produces on the auxiliary winding of single-ended flyback transformer T also raise, and this voltage obtains the 15V direct voltage behind over commutation, filter network, power to UC3842.This voltage as sampled voltage, is sent into UC3842 after dividing potential drop simultaneously, with reference voltage relatively after, amplify through error amplifier, the output duty of ratio is diminished, output voltage descends, and reaches the purpose of voltage stabilizing.Equally, when output voltage reduces, make the output duty of ratio become big, output voltage rises, the value that output voltage stabilization is being set.
Claims (2)
1. receive lamp controller based on the solar-powered high-pressure of single-stage inverter, it is characterized in that this controller contains: solar panel, storage battery, State Control part, charging control section branch, discharge control section and controlling object high pressure sodium lamp, wherein:
The State Control part comprises single-chip microcomputer or DSP control circuit, Hall current, voltage sensor and PWM chip for driving, wherein:
The Hall voltage transducer, is gathered the voltage of described solar panel and storage battery respectively by totally two;
Hall current sensor, is gathered the electric current of described solar panel and storage battery respectively by totally two;
Contain singlechip chip or dsp chip on the single chip machine controlling circuit, A/D, and programmable logic device, transceiver and toggle switch, single-chip microcomputer or DSP export three road pwm signals and state control signal as calculated, toggle switch on this single-chip microcomputer or the DSP control circuit links to each other with single-chip microcomputer by transceiver, is used for lighting hours and lighting system are carried out the artificial setting of parameter;
The PWM chip for driving, this chip receives single-chip microcomputer and sends three road pwm signals, through this chip conversion, power output PWM drive signal, driving power MOSFET pipe;
The charging control section branch is a battery charging circuit, and this battery charging circuit is by power MOSFET tube, fast recovery diode D, inductance L
1The DC chopper circuit that has filter capacitor that constitutes, the output of the solar cell behind its input termination capacitor filtering, the output termination storage battery of battery charging circuit, the voltage of solar panel and storage battery, current signal are sent into above-mentioned single-chip microcomputer through described voltage, current sensor, A/D converter, single-chip microcomputer or DSP calculate the peak power output of solar cell through first difference method, output pwm signal, manage through said PWM chip for driving driving power MOSFET, regulate duty ratio, to described charge in batteries, realize the MPPT maximum power point tracking function;
The discharge control section contains single stage type DC-DC full bridge inverter, high-frequency step-up transformer, high pressure sodium lamp starter and high-frequency electronic ballast unit, wherein:
Single stage type DC-DC full bridge inverter adopts resistance by 4, electric capacity, the power MOSFET tube of the absorption circuit that diode constitutes constitutes, in this inverter, the DC side power supply is provided by storage battery, storage battery side filter capacitor in parallel, the voltage of storage battery, current signal is through described voltage, current sensor, A/D converter is sent into above-mentioned single-chip microcomputer, single-chip microcomputer is two road variable pwm signals of output frequency as calculated, be given to the power MOSFET tube grid through described PWM chip for driving, by changing reverse frequency, thereby change the ballast reactance, control high pressure sodium lamp dividing potential drop realizes output voltage, controlled current and power saving function.
High-frequency step-up transformer, the inversion side of the described DC-DC inverter of former edge joint of this high-frequency step-up transformer, high-frequency step-up transformer is output as the high-frequency and high-voltage square-wave voltage;
Starter and high-frequency electronic ballast unit comprise: voltage-multiplying circuit, starter discharge circuit, ballast inductance T1 and current detection circuit, wherein:
The electric ballast unit is ballast inductance T1, current transformer T2 in this ballast inductance T1 and the current detection circuit and high pressure sodium lamp series connection inverter outlet side;
Voltage-multiplying circuit is directly from the power taking of inverter outlet side, the output termination starter discharge circuit of voltage-multiplying circuit;
The starter discharge circuit is by R1, C1, R2, C2, controllable silicon and puncture pipe constitute, R1 and C1 constitute charge circuit and are attempted by the voltage-multiplying circuit positive and negative end, R2, the former limit series connection of C2 and ballast inductance constitutes the electric capacity charge circuit and also is attempted by the voltage-multiplying circuit two ends, the controllable silicon positive pole connects capacitor C 2 positive poles, the controllable silicon negative pole connects the voltage-multiplying circuit negative pole, puncture the anodal and controllable silicon gate pole of pipe two termination C1, after the charging voltage of C1 equals to puncture the puncture voltage of pipe, puncture the pipe conducting, the C1 discharge, the conducting electric current injects the controllable silicon gate pole, the controllable silicon conducting, then by controllable silicon, the loop discharge that the former limit of C2 and ballast inductance constitutes then can induce the above high pressure of 3000V, with the lamp starter on the T1 secondary winding of ballast inductance;
Current detection circuit is made of current transformer T2, R3, D3, C3 and power MOSFET tube, the rectification circuit that T2 secondary parallel resistance R3 and D3, C3 constitute, power MOSFET tube drains and connects the C1 positive pole, source electrode connects the C1 negative pole through resistance R 4, grid connects the C3 positive pole, behind the lamp starter, then flow through electric current among the T2, the T2 secondary has induced current, be transformed to voltage signal through R3, the rectification circuit that constitutes through D3, C3 is delivered to the power MOSFET tube grid, conducting MOSFET again, thereby bypass charging capacitor C1 closes the starter discharge circuit.
2. the solar energy high voltage sodium lamp controller based on single-stage inverter according to claim 1 is characterized in that:
Described single chip machine controlling circuit and above-mentioned other circuit adopt separation between machine and card formula structure, and single chip machine controlling circuit is made control card, and control card is connected by slot with circuit board.
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| CNB2005100869183A CN100553398C (en) | 2005-11-18 | 2005-11-18 | Solar energy high voltage sodium lamp controller based on single-stage inverter |
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| CNB2005100869183A CN100553398C (en) | 2005-11-18 | 2005-11-18 | Solar energy high voltage sodium lamp controller based on single-stage inverter |
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