CN202077252U - Digital electronic ballast of electrodeless lamp - Google Patents

Abstract

The utility model relates to a digital electronic ballast of an electrodeless lamp, which comprises a power circuit, a PFC (power factor control circuit), a half-bridge drive circuit, a load match circuit, an embedded microprocess control circuit, a protective circuit, an SCI (serial communication interface) and a software unit, wherein the embedded microprocess control circuit adopts an STC12C5616AD chip, the half-bridge drive circuit adopts an IR2184 chip, the SCI is connected with an upper computer or a network, and the digital electronic ballast of the electrodeless lamp also comprises a load detection circuit and a signal conditioning circuit which adopts an LM324 chip. Compared with the prior art, the digital electronic ballast has a self-adaptive optimizing start function and a plurality of protective functions, thus preventing a load (coupler and a lamp tube) from being damaged due to overhigh start voltage or preventing the electronic ballast from being damaged due to unsuccessful start.

Description

A kind of electrodeless lamp digital and electronic ballast

Technical field

The utility model relates to a kind of digital control method of lighting source power supply, relates in particular to a kind of electrodeless lamp digital and electronic ballast.

Background technology

The application of electrodeless lamp is quite extensive, and its advantage is: life-span length, energy-saving and environmental protection, no stroboscopic, color rendering is good, colour temperature is optional, visible light ratio height, do not need preheating, excellent electrical properties, installation adaptability strong etc.Be widely used at present in engineering fields such as factory, supermarket, public illumination and road lightings.

Domestic Xuchang Vocationl Technical College poplar one equality has been introduced a kind of HF lamp without electrodes high frequency electric source (illuminating engineering journal, 2010,21 (1): 82-86 " research of HF lamp without electrodes high frequency electric source "), by the operation principle of high frequency generator of electrodeless lamp and coupler is studied.Provided the design of power unit, functional factor controlled function, inverter circuit and protective circuit.But, do not study key technical problems such as reliability and electrodeless lamp startup.

The Zhang Xing of HeFei University of Technology etc. has introduced a kind of HF lamp without electrodes illumination Design method that is used for the independent photovoltaic illuminator; (solar energy journal; 2010; 30 (2): 211-216 " HF lamp without electrodes independent photovoltaic illumination system layout "); respectively to electrodeless lamp lighting circuit based on the independent photovoltaic system; realize the integrated of controller for solar and electroless lamp ballasting device, still, do not further investigate the startup problem of electrodeless lamp and the protection problem under the various situation.

Mainly contain four companies such as Matsushita Electric Industries, Philip, GE, OSRAM abroad and develop electrodeless lamp product.First what introduce to the market is the Everlight electrodeless florescent lamp of nineteen ninety PANASONIC, and this lamp radio-frequency generator and fluorescent tube are integral configuration, and coupling coil is around in the fluorescent tube outside, belongs to outer excitation formula, operating frequency 13.56MHz.The electrodeless lamp of QL series of Philip exploitation, this lamp is interior excitation formula, induction coil places center dead slot in the fluorescent tube, lamp operating frequency 2.65MHz.The reflective electrodeless lamp of compact of U.S. GE company production in 1994 puts goods on the market.OSRAM is unwilling to be lag behind, the high-power electrodeless lamp of manifold type outside 1997 successfully develop, lamp operating frequency 250KHz.But because technology and market are not having deep introduction aspect Starting mode, control method and the protection of electrodeless lamp.

The utility model content

The purpose of this utility model be exactly for overcome prior art do not further investigate the deficiency of key technologies such as the Starting mode of electrodeless lamp, control method and guard method and provide a kind of with the embedded scm be core, have an electrodeless lamp digital and electronic ballast that the self adaptation optimizing starts function and kinds of protect function.

The purpose of this utility model can be achieved through the following technical solutions: a kind of electrodeless lamp digital and electronic ballast comprises power circuit, PFC power factor control circuit, half-bridge drive circuit, load matched circuit, embedded microprocessor controller circuit, protective circuit, serial communication interface and software unit.

Preferably, described embedded microprocessor controller circuit adopts the STC12C5616AD chip, and described half-bridge drive circuit adopts the IR2184 chip.

Preferably, described power circuit comprises differential mode noise filter, common-mode noise filter, rectifier bridge and filter capacitor; Described PFC power factor control circuit comprises FAN7530 control chip, energy storage inductor and switching tube; Described serial communication interface can be connected with host computer or network.

Preferably, described electrodeless lamp digital and electronic ballast also comprises load detecting circuit and signal conditioning circuit, and described signal conditioning circuit adopts the LM324 chip; Described load detecting circuit is made up of sample circuit, filter circuit, amplifying circuit, A/D converter.

Control method of the present utility model is to serve as to handle core with the STC12C5616AD chip that described embedded microprocessor controller circuit adopts; adopt the analytical method of the operating state of active variable frequency starting and the electrodeless lamp load of self-adapting detecting; handle electrodeless lamp and start and control problem, be implemented in the permanent power control at operating frequency place and realize bus protection, the online detection protection of bad lamp, non-loaded protection and short-circuit protection.

Preferably, described active variable frequency starting is to send the square-wave signal that is higher than resonance frequency by described STC12C5616AD chip when electrodeless lamp starts, and progressively reduces the frequency of signal, makes the voltage at electrodeless lamp coupler two ends progressively rise, when reaching starting resistor, light electrodeless lamp; The analytical method of the operating state of the electrodeless lamp load of described self-adapting detecting is described STC12C5616AD chip after detecting the fluorescent tube Continuity signal, and stable output frequency is an operating frequency, is implemented in the permanent power control at electrodeless lamp resonance frequency place.Owing to temperature and lamp parameter such as disperse at the Frequency point of reason in above-mentioned starting resistor correspondence, lamp is not lighted, the frequency of then described STC12C5616AD chip output continues to drop to a certain Frequency point, light lamp, by that analogy, up to frequency is the resonance frequency of described half-bridge drive circuit, thereby has improved the adaptive ability of this circuit igniting.

Preferably; voltage signal behind differential mode noise filter, common-mode noise filter, rectifier bridge and the filter capacitor rectifying and wave-filtering of described power circuit is through dividing potential drop; after sending the LM324 chip processing in the described signal conditioning circuit; send described STC12C5616AD chip to realize under-voltage protection, the voltage of electrodeless lamp load, electric current send described STC12C5616AD chip to realize the online detection protection of bad lamp, non-loaded protection and short-circuit protection behind described sample circuit and signal conditioning circuit.

Preferably, described embedded microprocessor controller circuit carries out variable frequency starting and operate as normal control to described half-bridge drive circuit; Described STC12C5616AD chip is other part co-ordinations of system core control system.

Preferably, described load detecting circuit carries out filtering and mould/number conversion, sets different voltage parameters detection signal, and analog quantity is converted to digital quantity, offers that described STC12C5616AD chip carries out the operate as normal monitoring and protection is handled.

Preferably, based on the electrodeless lamp Starting mode that different original frequencies are set, set initial start frequency and time interval scope again according to different loads, the initial start frequency range is 260KHz～300KHz, and time interval scope is 1ms～25ms.

Compared with prior art, the beneficial effects of the utility model are as follows:

1, can according to load and circuit parameter be dispersed and ambient stable changes the electrodeless lamp of self-adapting start, the problem of the adaptability difficulty that when changing fixed L C resonance frequency and starting the different loads parameter is changed.

2, avoided in essence owing to start the too high infringement that coupler and fluorescent tube are caused of the unsuccessful electric ballast infringement that causes or starting resistor.

3, realize bus protection, the online detection protection of bad lamp, non-loaded protection and short-circuit protection, improved the stability of electrodeless lamp digital and electronic ballast.

Description of drawings

Fig. 1 is the hardware block diagram of the utility model system;

Fig. 2 is semi-bridge inversion and a LC resonant circuit schematic diagram partly in the utility model;

When Fig. 3 was electrodeless lamp variable frequency starting, variation tendency concerned schematic diagram between coupler output voltage and the driving signal frequency;

Fig. 4 is that the electrodeless lamp of loaded self-adaptive starts and control circuit schematic diagram partly in the utility model;

Fig. 5 is electrodeless lamp Working state checking circuit and a signal conditioning circuit schematic diagram partly in the utility model;

Fig. 6 is the schematic diagram of serial communication interface circuit part in the utility model;

Fig. 7 is the block diagram of the utility model software unit;

Fig. 8 is a half-bridge startup subroutine flow chart in the utility model software unit;

Fig. 9 is a load protection subroutine flow chart in the utility model software unit.

Embodiment

Below in conjunction with the drawings and specific embodiments the utility model is elaborated.

Embodiment:

As shown in Figure 1, AC power is through being converted to the direct current of 400V behind EMI filtering (differential mode noise filtering, common-mode noise filtering), rectification and the capacitor filtering, be transformed into high-frequency electrical energy through half-bridge inversion circuit again, produce a high frequency square-wave voltage that operating frequency is 250KHz, and the ignition voltage of while through about 3000V of lc circuit generation, be sent to power coupler through feeder line.When high-frequency current passes through power coupler, produce an electromagnetic field of high frequency.Under the effect of high frequency magnetic field, electric field of the inner generation of bulb perpendicular to changes of magnetic field, the electronics of discharge space is quickened, when energy reaches certain value, bump with the gas molecule in the glass bulb, the inert gas generation ionization of cell-shell inside and and then produce avalanche effect, the gas avalanche ionization forms plasma, when the plasma excited atom was returned ground state in the bulb, spontaneous radiation went out ultraviolet ray and excites the three primary colors fluorescent powder on the bulb walls and send visible light.

At L shown in Figure 2 ₂C _sC _pIn the resonant circuit, the operating voltage V of lamp _Lamp, inverter is the edge frequency f of perception and capacitive _rBe respectively:

$V_{\mathrm{lamp}}=\frac{{2V}_{\mathrm{dc}}}{\mathrm{\π}}\frac{1}{\sqrt{{(1-k^2)}^2+\frac{1}{Q_P^2}{[k+\frac{C_P}{S}(k-\frac{1}{k})]}^2}{}^{}}---\left(1\right)$

$f_r=\sqrt{1-\frac{1}{Q_p^2}}{f}_p---\left(2\right)$

In the formula: f _pBe unloaded resonance frequency,

K=f/f _p

Characteristic impedance Z during resonance _pFor: $Z_p={\mathrm{\&omega;}}_{\mathrm{<figure-callout\; id="2"\; label="p\; L"\; filenames="HSA00000500297300021.png"\; state="\{\{state\}\}">p</figure-callout>}}{L}_{}{}_2=\frac{1}{{\mathrm{\&omega;}}_p{C}_p}---\left(3\right)$

Quality factor q _pFor: $Q_p=\frac{R_{\mathrm{lamp}}}{Z_p}---\left(4\right)$

Work as Q _p〉=1 o'clock, f/f _pWith Q _pIncrease and increase, load is perception when operating frequency f 〉=fr, the electric current in the switching tube lags behind voltage can realize ZVS.Therefore driving frequency f must satisfy f 〉=fr and just can make S5, S6 realize ZVS.L can be determined in through type (1)-(4) ₂And C _p, by suitable adjustment C _sSize make electrodeless lamp be operated in specified moving rate.Resistance R 18, R19 are the sample resistance of electrodeless lamp load output, after the rectification of diode D7, resistance R 20, capacitor C 16, voltage-stabiliser tube D8 circuit, filtering, amplitude limiting processing, as the load voltage sampling, are used for the control and the protection of electrodeless lamp.

Electrodeless lamp operating frequency is ω ₀(250KHz), relation is sent by the STC12C5616AD processor during startup and is higher than resonance frequency omega as shown in Figure 3 between the output voltage of half-bridge drive circuit and the frequency when fluorescent tube is lighted ₀Frequencies omega _S(span is that 260KHz～300KHz) square-wave signal is given chip for driving IR2184, its 7 pin Ho signal send metal-oxide-semiconductor G2 end among Fig. 2, its 4 pin Lo signal send metal-oxide-semiconductor G3 end among Fig. 2, through certain hour interval (1ms-25ms), progressively reduce the frequency of signal, the voltage at electrodeless lamp coupler two ends progressively rises, when reaching b point starting resistor U _ST1The time, light electrodeless lamp, behind the STC12C5616 chip detection fluorescent tube Continuity signal, stable output frequency is that operating frequency is ω ₀, be implemented in the permanent power control at electrodeless lamp operating frequency place.Owing to temperature and lamp parameter reason such as disperse at b point place, lamp is not lighted, and the frequency of processor output continues to drop to a to be pointed out, and lights lamp.By that analogy, up to frequency be the resonance frequency omega of half-bridge circuit ₀Thereby, realized the self-adapting start function of this circuit.

The circuit of the self adaptation igniting of realization circuit is seen Fig. 4, by cpu chip STC12C5616AD, half-bridge drive circuit U3 (IR2184 chip), and capacitor C 1, C2, C3, C4, resistance R 5, crystal oscillator CRY1 forms.Capacitor C 4 one ends link to each other with the 5V power supply, one end links to each other with ground, capacitor C 1 one ends link to each other with the 5V power supply, other end connecting resistance R5, resistance R 5 other ends link to each other with ground, crystal oscillator CRY1 one end links to each other with 4 pin of STC12C5616AD, the other end links to each other with 5 pin of STC12C5616AD, 4 pin of the termination STC12C5616AD of C2, the other end links to each other with ground, 5 pin of the termination STC12C5616AD of C3, and the other end links to each other with ground, 12 pin of STC12C5616AD link to each other with 1 pin of U3 (IR2184 chip), realize the signal output of different frequency.

Electrodeless lamp Working state checking circuit such as Fig. 5, circuit signal conditioning back output detection signal 1, signal 2, signal 3 that load sampling voltage signal is formed through the LM324 chip.2 pin of U3 in signal 1 map interlinking 3, the Lo of Control Driver, the output of Ho signal.9 pin of STC12C5616AD are used to carry out fluorescent tube damage differentiation in signal 1 map interlinking 4 simultaneously, 6 pin of STC12C5616AD are used to carry out the load short circuits differentiation in signal 2 map interlinkings 4, send the inverting input 6 of amplifier LM324,13 pin of STC12C5616AD are exported a predeterminable benchmark, send the in-phase input end 5 of LM324 to constitute Schmidt circuit, the signal 1 after obtaining nursing one's health.14 pin of STC12C5616AD are used to carry out non-loaded differentiation in signal 3 map interlinkings 4 simultaneously.

Because STC12C5616AD inside has multiplexing serial communication port: RXD, TXD and can carry out serial communication with host computer.Controller can be communicated with host computer by 485 mouthfuls, constitute long distance control system or system is debugged with PC.Serial communication circuit as shown in Figure 6.MAX485 carries out level conversion output, and J3 is the system debug end among the figure, and J6 is 485 outputs.

Design of System Software adopts modular design method, sees Fig. 7.Each function subprogram is called by monitoring program or initialization subroutine.Initialization subroutine carries out STC12C5616AD initialization, the setting of WatchDog Timer time out period, reads in relevant parameter, control and the initialization of protection parametric variable etc. from EEPROM.The WATCHDOG subprogram that the resets house dog that regularly resets.EEPROM read-write subprogram is read in relevant parameter in system initialization, after parameter is provided with again, calls this subprogram and upgrade corresponding units in the EEPROM, loses with parameter after preventing power down or shutdown.The communicator program then is responsible for communicating with other CPU.Measurement and control program reads in the A/D sampled value of load voltage, sends into the data buffer zone.

Half-bridge startup subroutine flow chart as shown in Figure 8.At first call in program initialization parameter, spark rate, time parameter are set, then igniting.If light a fire successfully, electrodeless lamp normally moves, if igniting is unsuccessful, resets spark rate, time parameter, and igniting again is up to lighting a fire successfully electrodeless lamp operate as normal.If after the igniting several times, do not light a fire yet successfully repeatedly, think that this moment, electrodeless lamp broke down, stop igniting, half-bridge quits work.Controller is in guard mode, starts the communicator program simultaneously, sends fault message.

The load protection subroutine flow chart as shown in Figure 9.Detection signal 1, bigger when detecting signal, think to stop half-bridge driven by bad lamp this moment that making output voltage is zero.If signal 1 is normal, detection signal 2, signal is very little when detecting, and thinks short circuit this moment to stop half-bridge driven, and making output voltage is zero.If signal 2 is normal, detection signal 3, less when detecting signal, think to stop half-bridge driven by load open circuit this moment that making output voltage is zero.

Claims (4)

1. electrodeless lamp digital and electronic ballast, it is characterized in that: described electrodeless lamp digital and electronic ballast comprises power circuit, PFC power factor control circuit, half-bridge drive circuit, load matched circuit, embedded microprocessor controller circuit, protective circuit and serial communication interface.

2. a kind of electrodeless lamp digital and electronic ballast as claimed in claim 1 is characterized in that: described embedded microprocessor controller circuit adopts the STC12C5616AD chip, and described half-bridge drive circuit adopts the IR2184 chip.

3. a kind of electrodeless lamp digital and electronic ballast as claimed in claim 2, it is characterized in that: described power circuit comprises differential mode noise filter, common-mode noise filter, rectifier bridge and filter capacitor; Described PFC power factor control circuit comprises FAN7530 control chip, energy storage inductor and switching tube; Described serial communication interface is connected with host computer or network.

4. as claim 1 or 2 or 3 described a kind of electrodeless lamp digital and electronic ballasts, it is characterized in that: described electrodeless lamp digital and electronic ballast also comprises load detecting circuit and signal conditioning circuit, and described signal conditioning circuit adopts the LM324 chip; Described load detecting circuit is made up of sample circuit, filter circuit, amplifying circuit, A/D converter.

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