CN101193486A - Lamp tube status judgement circuit and its controller - Google Patents
Lamp tube status judgement circuit and its controller Download PDFInfo
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- CN101193486A CN101193486A CNA2006101451988A CN200610145198A CN101193486A CN 101193486 A CN101193486 A CN 101193486A CN A2006101451988 A CNA2006101451988 A CN A2006101451988A CN 200610145198 A CN200610145198 A CN 200610145198A CN 101193486 A CN101193486 A CN 101193486A
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Abstract
The invention relates to a DC/AC conversion circuit for driving a load. The DC/AC conversion drive circuit comprises a switch device, a resonant groove, a voltage detection circuit and a controller. The switch device is coupled with a DC power. The resonant groove is coupled with the switch device and the load which converts the electric power of the DC power from the switch device into an AC signal in order to drive the load. The voltage detection circuit is coupled with the load and generates a voltage detection signal according the load voltage. The controller is coupled with the voltage detection circuit and the switch device and controls the electric power of the DC power that is transmitted to the resonant groove through the switch device. The controller decides the change of the operating frequency on the basis of the voltage detection signals.
Description
Technical field
The present invention relates to a kind of AC/DC conversion fluorescent lamp drive circuit, particularly relate to a kind of can be according to lamp tube status and the AC/DC conversion control circuit of frequency conversion.
Background technology
AC/DC conversion fluorescent lamp drive circuit on typical existing known techniques, generally abbreviate converter (inverter) as, mostly adopt the AC of full-bridge type, the filtering and the increasing apparatus that cooperate resonant slots, the direct voltage source of input can be converted to the alternating current of high pressure, in order to drive fluorescent lamp.In order to make the light stability of fluorescent lamp, can not change brightness along with the change of input voltage, so the negative feedback control circuit of mostly arranging in pairs or groups in its design, to stablize the operating current of fluorescent lamp.
Because fluorescent lamp required driving voltage difference before and after lighting, and the gain of resonant slots (Vout/Vin) also can change with respect to the characteristic relation of frequency, provides controlling signal so whether the controller of converter is lighted according to fluorescent tube.Be whether to surpass certain value with the detecting lamp current whether to judge lamp tube starting in the past.
As Fig. 1, lamp tube drive circuit comprises controller 110, switching device 120, resonant slots 130, fluorescent lamp 140, lamp current circuit for detecting 150 and light tube electric voltage circuit for detecting 160.The light tube electric voltage signal OV that back coupling signal FB, lamp tube status indicating signal CS that controller 110 is produced according to lamp current circuit for detecting 150 and light tube electric voltage circuit for detecting 160 are produced comes the on off state of control switch device 120, and then control is sent to the electric power of resonant slots 130 by input voltage vin.Resonant slots 130 becomes AC signal with the power conversions of input voltage vin, to drive fluorescent lamp 140.When lamp tube drive circuit starting just and during fluorescent tube not conducting as yet (lighting), see through and feedback signal FB, make controller control switch device 120 transmit more electric power, and the voltage of fluorescent lamp 140 also improves gradually to resonant slots 130.
When light tube electric voltage signal OV reached a preset value, controller 110 was regulated the electric power of output, and the voltage of fluorescent lamp 140 is maintained near the predetermined drive voltages value.Fluorescent lamp 140 is promptly lighted after a period of time under suitable predetermined drive voltages, and controller 110 sees through to judge whether the lamp tube status indicating signal CS that current-sensing circuit 150 is produced is higher than a predetermined value at this moment, judges with further whether fluorescent tube is lighted.After controller 110 is judged lamp tube starting, change frequency immediately, extremely be fit to fluorescent tube general operation frequency by higher lamp tube starting frequency translation.
Yet, referring to Fig. 2, can there be an equivalent capacitor C lk between the external device (ED)s such as fluorescent lamp 140 and casing 170, cause the part lamp current to see through this equivalent capacitor C lk and flow out.Therefore, the lamp tube status indicating signal CS of lamp current circuit for detecting 150 only can represent part lamp current value, but not real lamp current size.So in fact, fluorescent lamp 140 has been lighted, but controller 110 still can think fluorescent lamp 140 and do not light as yet, and to light the higher frequencies of operation of fluorescent tube.And capacitor C lk is in the lamp tube starting frequency of high frequency more, and its impedance is less, flows out via equivalent capacity Clk and the detecting that makes lamp tube status difficulty more than multi-light tube current.In addition, fluorescent lamp length is long more, and possible drain current path is also many more, and these all increase with electric current judges the whether difficulty of conducting of fluorescent tube.
This shows that above-mentioned existing AC/DC conversion fluorescent lamp drive circuit obviously still has inconvenience and defective, and demands urgently further being improved in structure and use.In order to solve the problem of above-mentioned existence, relevant manufacturer there's no one who doesn't or isn't seeks solution painstakingly, but do not see always that for a long time suitable design finished by development, and common product does not have appropriate structure to address the above problem, this obviously is the problem that the anxious desire of relevant dealer solves.Therefore how to found a kind of novel lamp tube status judgement circuit and controller thereof, real one of the current important research and development problem that belongs to, also becoming the current industry utmost point needs improved target.
Because the defective that above-mentioned existing AC/DC conversion fluorescent lamp drive circuit exists, the inventor is based on being engaged in this type of product design manufacturing abundant for many years practical experience and professional knowledge, and the utilization of cooperation scientific principle, actively studied innovation, in the hope of founding a kind of novel lamp tube status judgement circuit and controller thereof, can improve general existing AC/DC conversion fluorescent lamp drive circuit, make it have more practicality.Through constantly research, design, and, create the present invention who has practical value finally through after studying sample and improvement repeatedly.
Summary of the invention
Main purpose of the present invention is, overcome the defective that existing AC/DC conversion fluorescent lamp drive circuit exists, and provide a kind of novel lamp tube status judgement circuit, technical problem to be solved is to make it that a kind of AC is provided, utilize the terminal voltage of detecting load to judge the state of load, and adjust the frequency of operation of change-over circuit in view of the above, knownly judge the problem of the state of load to avoid existing, thereby be suitable for practicality more with the electric current of load.
Another object of the present invention is to, a kind of controller is provided, technical problem to be solved is to make it in order to the control AC.This controller utilizes the change in voltage characteristic in load condition when conversion and according to the terminal voltage of load and the relation between reference voltage, judges the state of load, and the frequency of operation of change-over circuit is adjusted in decision in view of the above.
The object of the invention to solve the technical problems realizes by the following technical solutions.According to a kind of AC that the present invention proposes, in order to drive a load, it is characterized in that this DC/AC conversion driving circuit comprises: a switching device is to couple a direct current power supply; One resonant slots is to couple this switching device and this load, will become an AC signal from the power conversions of this DC power supply of this switching device, to drive this load; One voltage detection circuit couples this load, produces a detecting voltage signal with the voltage according to this load; And a controller, be to couple this voltage detection circuit and this switching device, and see through the electric power size that this switching device control is passed to this DC power supply of this resonant slots; Wherein, this controller determines whether changing its frequency of operation based on this detecting voltage signal.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
Aforesaid AC, wherein said controller changes its frequency of operation after this detecting voltage signal surpasses one first scheduled time length greater than one first predetermined value.
Aforesaid AC, wherein said controller begin decision and whether change its frequency of operation after this detecting voltage signal is greater than one second predetermined value.
Aforesaid AC, wherein said controller begin decision and whether change its frequency of operation after this detecting voltage signal is greater than one the 3rd predetermined value.
Aforesaid AC, wherein said controller more receive a brightness adjustment control signal, and when changing frequency of operation, the electric power size of this DC power supply that is passed to this resonant slots is regulated in beginning according to this brightness adjustment control signal.
Aforesaid AC, wherein said controller more determine whether stopping to transmit the electric power of this DC power supply to this resonant slots based on this detecting voltage signal.
Aforesaid AC, wherein said controller if decision does not change its frequency of operation, then stop to transmit the electric power of this DC power supply to this resonant slots after one second scheduled time length.
Aforesaid AC, it is characterized in that more comprising one first current-sensing circuit, this current-sensing circuit couples this load, produce one first current sense signal with the electric current according to this load, wherein this controller is passed to the electric power size of this DC power supply of this resonant slots according to this first current sense signal adjustment.
Aforesaid AC, wherein said controller more determines whether changing its frequency of operation based on this detecting voltage signal after this first detecting voltage signal is greater than one first predetermined value.
Aforesaid AC, it is characterized in that more comprising one second current-sensing circuit, this current-sensing circuit couples this load, produce a lamp tube status indicating signal with electric current according to this load, wherein this controller more determines whether changing its frequency of operation based on this lamp tube status indicating signal after this first detecting voltage signal is greater than one first predetermined value.
The object of the invention to solve the technical problems also realizes by the following technical solutions.According to a kind of controller that the present invention proposes, in order to control an AC to drive a load, this controller comprises: a frequency generator, in order to produce a reference signal; One pulse width regulating circuit couples this frequency generator, and adjusts signal according to this reference signal to produce a pulsewidth; One drive circuit couples this pulse width regulating circuit and adjusts signal to produce a plurality of driving signals according to this pulsewidth; And a lamp tube status judgement circuit, comprise one first decision circuitry, whether this first decision circuitry produces one first according to a detecting voltage signal and one first reference voltage with decision is judged signal; Wherein this frequency generator first judges whether signal adjusts the frequency of this reference signal with decision based on this.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
Aforesaid controller, wherein said lamp tube status judgement circuit more comprises one second decision circuitry, whether this second decision circuitry produces one second according to this detecting voltage signal and one second reference voltage with decision is judged signal, and this frequency generator more second judges that signal is to determine whether to adjust the frequency of this reference signal based on this.
Aforesaid controller, wherein said first decision circuitry produce this first judgement signal after this detecting voltage signal is greater than this first reference voltage.
Aforesaid controller, wherein said second decision circuitry produce this at this detecting voltage signal and second judge signal greater than this second reference voltage and during again less than this second reference voltage.
Aforesaid controller, wherein said second decision circuitry produces one first replacement signal to this first decision circuitry at this detecting voltage signal during greater than this second reference voltage, and whether this first decision circuitry more produces this based on this first replacement signal with decision first is judged signal.
Aforesaid controller, wherein said lamp tube status judgement circuit more comprises one the 3rd decision circuitry, whether the 3rd decision circuitry produces one the 3rd judgement signal according to this detecting voltage signal and one the 3rd reference voltage with decision, and this frequency generator more judges based on the 3rd whether signal adjusts the frequency of this reference signal with decision.
Aforesaid controller, wherein said the 3rd decision circuitry produce the 3rd at this detecting voltage signal and judge signal greater than the 3rd reference voltage and during again less than the 3rd reference voltage.
Aforesaid controller, wherein said the 3rd decision circuitry produces one second replacement signal to this first decision circuitry at this detecting voltage signal during greater than the 3rd reference voltage, and whether this first decision circuitry more produces this based on this second replacement signal with decision first is judged signal.
Aforesaid controller, wherein said lamp tube status judgement circuit more comprises one the 3rd decision circuitry, whether the 3rd decision circuitry produces one the 3rd judgement signal according to a lamp tube status indicating signal and one second reference voltage with decision, this frequency generator is more judged signal to determine whether to adjust the frequency of this reference signal based on the 3rd, and wherein this lamp tube status indicating signal is in order to indicate the current value of this load.
Aforesaid controller, wherein said pulse width regulating circuit produces error amplification signal according to a back coupling signal and one second reference voltage, and this first decision circuitry more amplifies signal according to this error and whether one the 3rd reference voltage produces this first judgement signal with decision.
Aforesaid controller is characterized in that more comprising a timer, and this timer produces the time to signal after a scheduled time.
Aforesaid controller is characterized in that more comprising a protective circuit, and this protective circuit couples this drive circuit, whether sends a protection signal in order to decision, and based on this time to signal to determine whether to come into operation.
Aforesaid controller is characterized in that wherein said lamp tube status judgement circuit first judges signal and this second judges whether signal sends an abnormal signal with decision, and this protective circuit receives this abnormal signal and sends this protection signal in view of the above based on this.
Aforesaid controller is characterized in that more comprising a light adjusting circuit, and this light modulation signal receives a brightness adjustment control signal, and based on this first judge signal and this second judge signal with decision whether according to these a plurality of driving signals of this brightness adjustment control signal adjustment.
The present invention compared with prior art has tangible advantage and beneficial effect.By above technical scheme as can be known, major technique of the present invention thes contents are as follows: in order to achieve the above object, the invention provides a kind of AC, in order to drive a load.This DC/AC conversion driving circuit comprises a switching device, a resonant slots, a voltage detection circuit and a controller.This switching device couples a direct current power supply.This resonant slots couples this switching device and this load, will become an AC signal from the power conversions of this DC power supply of this switching device, to drive this load.This voltage detection circuit couples this load, produces a detecting voltage signal with the voltage according to this load.This controller is to couple this voltage detection circuit and this switching device, and sees through the electric power size that this switching device control is passed to this DC power supply of this resonant slots, and wherein this controller determines whether changing its frequency of operation based on this detecting voltage signal.
In addition, in order to achieve the above object, the present invention provides a kind of controller in addition, in order to control an AC to drive a load.This controller comprises a frequency generator, a pulse width regulating circuit, one drive circuit and a lamp tube status judgement circuit.This frequency generator is in order to produce a reference signal.This pulse width regulating circuit couples this frequency generator, and adjusts signal according to this reference signal to produce a pulsewidth.This drive circuit couples this pulse width regulating circuit and adjusts signal to produce a plurality of driving signals according to this pulsewidth.This lamp tube status judgement circuit comprises one first decision circuitry, and whether this first decision circuitry produces one first judgement signal according to a detecting voltage signal and one first reference voltage with decision.Wherein, this frequency generator first judges whether signal adjusts the frequency of this reference signal with decision based on this.
By technique scheme, lamp tube status judgement circuit of the present invention and controller thereof have following advantage at least: invention is the minimum possibility voltage V1 that whether surpasses the fluorescent tube normal running based on the fluorescent tube terminal voltage, and, infer or judge whether fluorescent tube starts whether to surpass a predetermined value (the accurate position of signal S3 is descended) above the scheduled time behind the voltage V1 or load current signal S4.On the other hand, the present invention also utilizes the fluorescent tube starting process, and terminal voltage can rise at prestart, and the characteristic that falls after rise after starting, judges with one group or above decision circuitry whether fluorescent tube starts.Certainly, the present invention also can be aided with and existing directly judges lamp tube status with the lamp current judgment mode in known.
In sum, the invention relates to a kind of AC, in order to drive a load.This DC/AC conversion driving circuit comprises a switching device, a resonant slots, a voltage detection circuit and a controller.This switching device couples a direct current power supply.This resonant slots couples this switching device and this load, will become an AC signal from the power conversions of this DC power supply of this switching device, to drive this load.This voltage detection circuit couples this load, produces a detecting voltage signal with the voltage according to this load.This controller is to couple this voltage detection circuit and this switching device, and sees through the electric power size that this switching device control is passed to this DC power supply of this resonant slots, and wherein this controller determines whether changing its frequency of operation based on this detecting voltage signal.The present invention has above-mentioned plurality of advantages and practical value, no matter it all has bigger improvement on product structure or function, obvious improvement is arranged technically, and produced handy and practical effect, and more existing AC/DC conversion fluorescent lamp drive circuit has the outstanding effect of enhancement, thereby being suitable for practicality more, and having the extensive value of industry, really is a new and innovative, progressive, practical new design.
Above-mentioned explanation only is the general introduction of technical solution of the present invention, for can clearer understanding technological means of the present invention, and can be implemented according to the content of specification, and for above-mentioned and other purposes, feature and advantage of the present invention can be become apparent, below especially exemplified by preferred embodiment, and conjunction with figs., be described in detail as follows.
Description of drawings
Fig. 1 is the circuit diagram for existing known a kind of lamp tube drive circuit.
Fig. 2 is the schematic diagram for the leak flow path of display lamp tube current.
Fig. 3 is the schematic diagram for the fluorescent lamp starting curve.
Fig. 4 is the circuit diagram according to the AC of one embodiment of the invention.
Fig. 5 is the circuit diagram according to the lamp tube status judgement circuit of one embodiment of the invention.
Fig. 6 is the circuit diagram for according to another embodiment of the present invention lamp tube status judgement circuit.
Fig. 7 is the circuit diagram for according to still another embodiment of the invention lamp tube status judgement circuit.
Fig. 8 is the circuit diagram of the lamp tube status judgement circuit of an embodiment more according to the present invention.
110: controller 120,302: switching device
130,303: resonant slots 140,304: fluorescent lamp
150: lamp current circuit for detecting 160: the light tube electric voltage circuit for detecting
Vin: input voltage FB: back coupling signal
CS: lamp tube status indicating signal OV: light tube electric voltage signal
Clk: equivalent capacity 300: AC
301: direct voltage source 302A, 302B: the electric crystal switch
305: transformer 306,307,308,313: electric capacity
310: pulse width regulating circuit 311: error amplifier
312: comparator 314,375a, 375b: or logic
315,352,353: switch 316: current source
317,354: resistance 320: frequency generator
330: timer 340: protective circuit
341: logic control circuit 342,379a～379f: inverter
343,344,355: comparator 350: light adjusting circuit
351: light modulating frequency generator 360: drive circuit
370: lamp tube status judgement circuit 370a, 370b: decision circuitry
371a～371e: fasten lock circuit 373: the anti-logic that reaches
374,374a: delay circuit 377a～377c: determining device
S1～S18: signal 380: current-sensing circuit
390: voltage detection circuit POUT, NOUT: drive output signal
V1～V3, Vref1～Vref3: reference voltage
Embodiment
Reach technological means and the effect that predetermined goal of the invention is taked for further setting forth the present invention, below in conjunction with accompanying drawing and preferred embodiment, to lamp tube status judgement circuit and its embodiment of controller, structure, feature and the effect thereof that foundation the present invention proposes, describe in detail as after.
Seeing also Fig. 3, is to be that general fluorescent lamp starting may situation, and wherein curve a, e are the situation of lamp tube starting failure, and curve b, c, d are for lighting case of successful.The situation of curve a is the fluorescent tube damage, so though sufficient voltage Vov (maximum voltage of lamp tube starting) is provided, right fluorescent lamp still can't be lighted and make light tube electric voltage maintain Vov always always.The situation of curve b for general under the difficult environment of lighting (as: ambient temperature is extremely low, the environment of extreme dark etc.), the change in voltage before and after fluorescent lamp is lighted, behind lamp tube starting, light tube electric voltage can drop to general operating voltage interval fast.
The situation of curve c is the environment of relatively easy starting, and for example: ambient temperature is higher, extraneous irradiate light is arranged, the fluorescent tube situation is quite good etc., so light tube electric voltage just lights before not reaching Vov as yet, and then reduces to general operating voltage district.The situation of curve d is best situation, as: the fluorescent tube situation is splendid, fluorescent tube has just extinguished and lamp hole temperature is still high, ambient light is according to abundance etc., this moment fluorescent tube voltage not just like as curve b, the c through the too high voltages starting, but voltage is directly lighted once rising.The situation of curve e is that fluorescent tube can't receive enough driving voltages so that can't light always, causes the reason of this situation that the output short circuit etc. of resonant slots is arranged.
Based on above-mentioned possible fluorescent tube situation, the present invention has set two voltage V1 and V2, wherein V1 is the minimum possibility voltage of fluorescent tube in normal running (promptly lighting the back), and V2 is the highest possibility voltage of fluorescent tube normal running (promptly lighting), utilizes above-mentioned two voltages to judge whether fluorescent tube is lighted.So, can avoid judging the wrongheaded problem that is faced with lamp current in the existing prior art.
The execution mode that the present invention may change with several following embodiment explanations, but not as limit.Mentioned low level signal or high levle signal among narration also can be interpreted to simultaneously this signal and be equal to this signal at low level and do not produced, and this signal is equal to this signal at high levle and is produced, and is illustrated earlier at this.
Consulting Fig. 4, is to be the circuit diagram according to the AC of one embodiment of the invention.AC 300; in order to drive fluorescent lamp 304, it comprises: pulse width regulating circuit 310, frequency generator 320, timer 330, protective circuit 340, light adjusting circuit 350, drive circuit 360, lamp tube status judgement circuit 370, switching device 302, resonant slots 303, current-sensing circuit 380 and voltage detection circuit 390.Its annexation is described below.
This direct voltage source 301 is coupled to this switching device 302.The output of this switching device 302 is coupled to the input of this resonant slots 303.The output of this resonant slots 303 is coupled to an end of this fluorescent lamp 304.Resonant slots among the present invention can be the transformer of any kind of, as magnetic transformer, piezoelectric ceramic transformer etc., but also not as limit.The two ends of this fluorescent lamp 304 are coupled to this current-sensing circuit 380 and this voltage detection circuit 390 respectively.This current-sensing circuit 380 also is coupled to this pulse width regulating circuit 310, and this pulse width regulating circuit 310 is coupled to this frequency generator 320 and this drive circuit 360.This drive circuit 360 is coupled to this switching device 302, forms so-called control loop and connects.
Wherein, AC in the present embodiment is the semibridge system AC, but the present invention also is applicable to full-bridge type, push-pull type AC etc., not as limit.This switching device 302 comprises two power switch 302A, 302B.This power switch 302A can be P type metal-oxide-semiconductor (MOS) (PMOS) power switch, this power switch 302B can be N type metal-oxide-semiconductor (MOS) (NMOS) power switch, but two power switch 302A, 302B are not limited to metal-oxide-semiconductor (MOS) (MOS) power switch, also can be all kinds of electric crystal switches, as BJT of NPN or positive-negative-positive etc.
This frequency generator 320 produces a triangular wave signal S1 and a pulse wave signal S2 of same frequency.Yet be not limited to the use of triangular wave signal in the present invention, all any slopes (Ramp signal) or the sawtooth waveforms signal all is applicable to the present invention.
This current-sensing circuit 380 is connected with this fluorescent lamp 304, and provides a load current signal S4 to flow through the current value of this fluorescent lamp in order to indication.This voltage detection circuit 390 sees through this resonant slots 303 in parallel with this fluorescent lamp 304, utilizes resonant capacitance 307,308 wherein and detects a load voltage signal S5 in order to indicate the terminal voltage of this fluorescent lamp 304.
This pulse width regulating circuit 310 comprises an inverting integrator and the comparator 312 that an error amplifier 311, a resistance 317 and an electric capacity 313 are formed.In addition, this pulse width regulating circuit 310 more comprises a controlled current source 315, and it is connected to the end of oppisite phase input of this error amplifier 311 via a switch 316.
This protective circuit 340 comprises a logic control circuit 341, and this protective circuit 340 is accepted abnormal signal S13, amplifies signal S3 in order to this a signal S5 of indication fluorescent lamp terminal voltage and an error of the error amplifier 311 in this pulse width regulating circuit 310.
350 of this light adjusting circuits comprise a light modulating frequency generator 351, one triangular wave signal S7 of its generation is sent to the non-inverting input of a comparator 355 and the inverting input that a brightness adjustment control signal S8 is admitted to this comparator 355, relatively the back produces a light modulation pulse wave signal S9, and this light modulation pulse wave signal S9 sees through control switch 352,353 control dimmer voltage S20 and sends to the opportunity of this pulse width regulating circuit 310.
Must pay special attention to; in above-mentioned, describe the structure of protective circuit 340, light adjusting circuit 350 and pulse width regulating circuit 310 in detail; be for the relation of the running between each circuit that can clearly demonstrate lamp tube status judgement circuit 370 and couple, non-in order to limit the structural design of those circuit.
This drive circuit 360 receives the output S12 of pulse width regulating circuit 310; and cooperate the pulse wave signal S2 of frequency generator 320 outputs and the output signal S18 of protective circuit 340 to produce two driving output signal POUT, NOUT, in order to electric crystal switch 302A, the 302B in the difference control switch device 302.
In the present embodiment, this timer 330 produces one and resets signal S11 and a time to (TimeOut) signal S10.Reset the signal of reseting that signal S11 can be used as analogy in the circuit or digit circuit (for example: pulse width regulating circuit 310 and logic control circuit 341), make those circuit in due course function reset circuit and export the signal of initial condition, avoid circuit to produce signal improperly, and make the improper running of corresponding circuit in starting or other situations.Time is in order to indicate the time signal of general fluorescent tube starting to signal S10.When the time exported to signal S10, representing normal fluorescent tube should be to be in conducting state.And the circuit that is not suitable for operating before the conducting at fluorescent tube, for example protective circuit 340, just come into operation behind signal S10 in the time of receiving.
Whether frequency generator 320 also is subjected to signal S15 control, and this signal S15 is produced by lamp tube status judgement circuit 370, in order to indicate fluorescent lamp conducting.Under the situation of these fluorescent lamp 304 conductings, send a fluorescent lamp frequency of operation, and under the situation of this not conducting of fluorescent lamp, send another starting fluorescent lamp frequency to drive circuit 360.Because whether under the conducting and inequality, such design can utilize different fluorescent lamp frequency of operation to carry out the operation of different conducting situations at fluorescent lamp for the resonance frequency of this resonant slots 303.No matter make system whether can make the more efficient running of system near suitable frequency of operation (for example: the resonance frequency) operation down under the situation of conducting at fluorescent lamp.
Lamp tube status judgement circuit 370 comprises one first decision circuitry 370a and one second decision circuitry 370b.The first decision circuitry 370a and the second decision circuitry 370b comprise determining device 377b and 377a respectively.Wherein determining device 377a is in order to fluorescent tube starting curve a, b, c among judgement Fig. 3, and determining device 377b is in order to judge fluorescent tube starting curve d, the e among Fig. 3.In this embodiment, the load voltage signal S5 of this voltage detection circuit 390 is the half-wave signal, so determining device 377a, 377b are higher than comparative voltage V2, V1 in order to the voltage amplitude of judging each half-wave; When the amplitude of certain one-period is higher than comparative voltage in judging signal S5, promptly export the high levle signal (for example: the one-period of signal S2 or above time span) of appropriate time length.
Lamp tube status judgement circuit 370 is output signal S13 and S15 respectively, and wherein signal S13 passes to protective circuit 340, makes protective circuit 340 judge whether to stop drive circuit 360 effects according to signal S13.And signal S15 passes to light adjusting circuit 350 and frequency generator 320, and whether light adjusting circuit 350 carries out light modulation according to signal S15 with decision, and whether frequency generator 320 carries out frequency conversion according to signal S15 with decision.Generally speaking, when frequency generator 320 changes frequency of operation, light adjusting circuit 350 beginning light modulations (adjusting is passed to the electric power size of this DC power supply 301 of this resonant slots 303).
Under normal condition, present embodiment is operated as described below in more detail:
After system begins the power supply starting, this timer 330 produce reset signal S11 through one or (OR) logic 314 with a switch 316 conductings (turn on), make this current source 315 link the inverting input of this error amplifier 311, force inverting input voltage to exceed a reference level Vref1.So can force this error amplifier 311 to be output as zero, so that the work period of the output S12 of pulse width regulating circuit 310 becomes 0%.This output S12 signal of 0% makes the work period of POUT and NOUT all become 0% through behind the drive circuit 360 as present embodiment, and then makes switch 302A, 302B by (turn off).
Reset signal S11 when this timer 330 stops output after a scheduled time, this current supply switch 316 ends.At this moment, this pulse width regulating circuit 310 comes into operation, and the input of the end of oppisite phase of this error amplifier 311 is because the not conducting and become a situation that is lower than this reference level Vref1 as yet of this fluorescent lamp 304.This signal S3 that this error amplifier 311 is exported rises under the negative feedback control principle gradually, and with this triangular wave S1 relatively after, send a pulse wave width modulation signal S12 by this comparator 312.This drive circuit 360 receives this this signal S12 and this pulse wave signal S2, produces two groups of signal POUT, NOUT, respectively in order to electric crystal switch 302A, 302B in the control switch device 302 by or conducting, output to the electric power of fluorescent lamp 304 with adjustment.Broadening gradually of this pulse wave width modulation signal S12 work period and raising will be so the driving voltage of fluorescent lamp 304 also will rise gradually.
When the situation as the curve b of Fig. 3, the driving voltage that resonant slots 303 exports fluorescent lamp 304 to will rise gradually.When the voltage of fluorescent lamp 304 is higher than comparative voltage V1 and when being lower than comparative voltage V2, the determining device 377a output low level signal in the lamp tube status judgement circuit 370 and determining device 377b output high levle signal.After delay circuit 374 receives the high levle signal of determining device 377b, will behind a predetermined time delay, export the high levle signal.In addition, fasten after lock circuit 371c receives the low level signal of determining device 377a, and export a low level signal, see through inverter 379a and export a high levle signal, make and fasten that lock circuit 371b is in the state of reseting and ineffective to fastening lock circuit 371b.
The voltage of fluorescent lamp 304 exceeds comparative voltage V2 subsequently, and determining device 377a also begins to export the high levle signal.Fasten after in a single day lock circuit 371c receive the high levle signal of determining device 377a, will continue to export a high levle signal.Delay circuit 374 can receive in this predetermined time delay in principle and be in the state of reseting behind the high levle signal of fastening lock circuit 371c and ineffective.
On the other hand, inverter 379a begins to export a low level signal to fastening lock circuit 371b, therefore fastens lock circuit 371b and begins effect.The same time, the high levle signal of determining device 377a becomes the low level signal through inverter 379b, so the time fasten lock circuit 371b and also export the low level signal.Owing to or two input signals of logic 375a this moment be the low level signal and export the low level signal.In addition, the time of timer 330 also is in low level to signal S10, makes through inverter 379c to fasten lock circuit 371a and be in the state of reseting and ineffective, and therefore, or two input signals of logic 375b also are the low level signal and export the low level signal.
After the driving voltage of fluorescent lamp 304 rises to a predetermined fluorescent tube starting voltage Vov at last; comparator 343 in this protective circuit 340 is detecting this indication fluorescent lamp terminal voltage signal S5 above a default reference level Vref2; and send a fluorescent lamp terminal voltage above signal S16; make this switch 316 conductings (Turn On) through this or logic lock 314; the electric current of this current source 315 will flow into the inverting input of this error amplifier 311; 311 output S3 diminish this error amplifier; reduce this pulse wave width modulation signal S12 work period then, be transported to the electric power of this fluorescent lamp pipe end with minimizing.Then, when detecting indication fluorescent lamp terminal voltage signal S5 less than this default reference potential Vref2, then this current supply switch 316 ends, and makes this error amplifier 311 output S3 become big.So this fluorescent lamp terminal voltage just obtains stable regulation under the control of such negative feedback, to continue to maintain near this predetermined fluorescent tube starting voltage Vov.
In case fluorescent lamp is lighted conducting down by enough driving voltage Vov and time, according to the fluorescent lamp characteristic, this fluorescent lamp terminal voltage S16 can rapid drawdown to half less than conducting and approximate fixing operating voltage, this operating voltage shown in the curve b of Fig. 3 between voltage V1 and V2.At this moment, the output of the determining device 377a in the lamp tube status judgement circuit 370 becomes the low level signal, exports the high levle signal through inverter 379b.After fastening the high levle signal of lock circuit 371b reception inverter 379b, continue output high levle signal.This moment or logic 375a also export the high levle signal, and or logic 375b also export the signal S15 of high levle, the conducting of indication fluorescent lamp 304.It is general fluorescent tube frequency of operation that this frequency generator 320 receives the frequency that changes signal S1, S2 behind this indicating lamp tube conducting signal S15.And behind light adjusting circuit 350 this indicating lamp tube conducting signal of reception S15, begin to carry out dimming function.
When as the situation of the curve c of Fig. 3, will be similar to the situation of above-mentioned curve b, its difference only can not start the negative feedback control of current supply switch 316 at the driving voltage no show voltage Vov of fluorescent lamp 304, so be not repeated at this.
When as the situation of the curve d of Fig. 3, the driving voltage of fluorescent lamp 304 can't surpass voltage V2, so the output of determining device 377a is the low level signal always, after fastening lock circuit 371c and inverter 379a, produce a high levle signal, make and fasten that lock circuit 371b is in the state of reseting and ineffective always.After delay circuit 374 received the high levle signal of determining device 377b, output high levle signal behind a predetermined time delay made or logic 375a also exports the high levle signal.Logic 375b receives or the high levle signal of logic 375a after also export the signal S15 of high levle, the conducting of indication fluorescent lamp 304.
The predetermined time delay of delay circuit 374 is the time that general fluorescent lamp is enough started, and can arrive signal S10 with time to the signal S10 while or the time that is shorter than.When the time that is shorter than arrives signal S10, and fluorescent lamp 304 is not really started, when the frequency that then changes signal S1, S2 after frequency generator 320 receives this indicating lamp tube conducting signal S15 is general fluorescent tube frequency of operation, the terminal voltage of fluorescent lamp 304 can be lower than voltage V1, makes signal S15 get back to low level once again.Therefore, the frequency that frequency generator 320 can change signal S1, S2 again is the fluorescent tube starting frequency, attempts starting fluorescent lamp 304 once again, till fluorescent lamp 304 real startings or time produce to signal S10.
If the fluorescent lamp starting process is unusual condition, and when causing curve a, e as Fig. 3, the detail operations process of lamp tube status judgement circuit 370 is as follows:
When as the situation of the curve a of Fig. 3, the process that the fluorescent lamp terminal voltage rises to voltage Vov does not repeat at this as described in the above-mentioned curve b.Then, because fluorescent lamp can't be started always, the fluorescent lamp terminal voltage maintains near the voltage Vov always.Delay circuit 374 is in the state of reseting always and is ineffective; Fasten lock circuit 371b and then export the low level signal always.Therefore, signal S15 also will be in always and represent the not low level signal of conducting of fluorescent lamp.
When as the situation of the curve e of Fig. 3, owing to the fluorescent tube terminal voltage fails to make determining device 377a, 377b export low level voltage above voltage V1 always always, so delay circuit 374 also exports low level voltage always, fasten lock circuit 371b and then be and be in the state of reseting and ineffective always.Therefore, signal S15 also will be in always and represent the not low level signal of conducting of fluorescent lamp.
Fasten lock circuit 371a the time to being in Reset Status before signal S10 sends and there is not effect.When fluorescent lamp 304 started successfully before signal S10 sends in the time, then the time sends the back to signal S10 and sees through inverter 379c and make and fasten lock circuit 371a and come into operation, fasten that lock circuit 371a receives this moment or the high levle signal of logic 375a after, will send and pin in the high levle signal.Under such situation, after lamp tube status judgement circuit 370 sent to signal S10 in the time, signal S15 also can pin in the high levle signal of representing the fluorescent tube starting.So, if fluorescent lamp 304 does not start successfully before signal S10 sends in the time, after then lamp tube status judgement circuit 370 sent to signal S10 in the time, can export the low level signal of representing the fluorescent tube unstart.
In addition, lamp tube status judgement circuit 370 can send the state of signal S13 notice protective circuit 340 fluorescent lamps 304.Protective circuit 340 begins the execute protection function at time of reception behind signal S10.If fluorescent lamp 304 sends preceding starting in the time to signal S10, then the terminal voltage of fluorescent lamp 304 must make determining device 377b send the high levle signal greater than voltage V1, and or logic 375a also export the high levle signal.Therefore instead reaching (NAND), two input signals of logic 373 are the high levle signal and export and represent the normal low level signal of fluorescent lamp state.So; though when fluorescent lamp 304 normal startings, in use extinguish, cause terminal voltage to be lower than voltage V1; the signal S13 of the high levle of fluorescent lamp abnormal state is represented in the then anti-output that reaches logic 373, causes protective circuit 340 also to export the protection signal S18 of high levle.After drive circuit 360 receives the protection signal S18 of high levle, can continue to transmit the electric power of direct voltage source 301 to resonant slots 303 by switch shutdown switch device 302.
On the other hand, if fluorescent lamp 304 fails to send preceding starting in the time to signal S10,375a output low level signal so the signal S13 of the high levle of fluorescent lamp abnormal state is represented in the output of anti-and logic 373, causes switching device 302 to stop to transmit electric power to resonant slots 303.
In addition, protective circuit 340 is utilized the pulse wave signal S6 timing of a numerical digit timing unit with light modulating frequency generator 351 generations of low frequency.Pick up counting after receiving the high levle signal S13 that represents the fluorescent lamp abnormal state, signal S13 still maintains the high levle signal in case surpass the default time, and then this logic control circuit 341 is sent the signal S18 that stops to export and arrived this drive circuit 360.So, in the time of can avoiding light adjusting circuit 350 runnings, judge this fluorescent lamp 304 by accident and extinguish.
In addition, electric leakage is arranged when badly damaged if run into this transformer 305 under the situation of general operation, because the extra load effect that electric leakage causes, the system that will make produces the overload phenomenon.Under this situation, this error amplifier 311 will continue to increase its output S3 and stablize the fluorescent lamp electric current so that enough electric power to loads to be provided.In case electric leakage surpassed system can provide during maximum power, this error amplifier 311 output S3 certainly will be above the peak value of this triangular wave S1.This protective circuit 340 is compared this error amplifier 311 output S3 and can be obtained an indication mechanism and whether transship signal S14 with a reference potential Vref3 slightly higher than triangular wave S1 peak value.Equally; start under the situation of this protective circuit 340 with S10 at this timer 330; if whether indication mechanism transships signal S14 indication mechanism overload; and when also surpassing Preset Time through this pulse wave signal S2 timing that this logic control circuit 341 produces with frequency generator 320, then this logic control circuit 341 is sent the signal S18 that stops to export and is arrived this drive circuit 360.
Present embodiment more comprises a light adjusting circuit 350, and the principle of light modulation is with a frequency S7 lower than fluorescent lamp frequency of operation, and control stops or recovering fluorescent lamp is transmitted electric power.Utilize the adjustment of light and shade ratio to reach the order ground of adjusting fluorescent lamp brightness, and, generally all light modulating frequency is controlled at greater than more than the 200Hz for fear of the impression that underfrequency causes human eye to glimmer.The light adjusting circuit 350 of present embodiment is to be instructed to fluorescent lamp whether conducting signal S15 controls.Whether conducting signal S15 indicates the fluorescent lamp conducting when this indication fluorescent lamp, and a switch 353 of control light modulation signal output just can conducting (Turn on).
Dimmer voltage S20 in the light adjusting circuit 350 is a current potential higher than reference level Vref1.When the dimmer voltage S20 in the light adjusting circuit when control switch 353,352 is connected with this pulse width regulating circuit 310 with a resistance 354, the error amplifier of this pulse width regulating circuit 310 311 output S3 diminish, and cause system to stop electric power and are delivered to load.And when light modulation pulse wave signal S9 ends (Turn Off) this switch 352, dimmer voltage S20 and this pulse width regulating circuit 310 open circuits (open circuit), system restoration supply of electric power.The ratio of utilizing a low frequency to control to stop in each cycle or recovering supply of electric power can reach the effect of adjusting brightness.And utilize the fluorescent lamp conducting whether to determine the opportunity that light modulation begins, can ensure that fluorescent lamp has enough and continuous electric power to be lighted in time enough.
In the present embodiment, light adjusting circuit 350 is to be coupled to the inverting input of error amplifier 311 in the pulse width regulating circuit 310 and to reach dimming function.So in fact, the coupling mode that the light modulation signal can be sent to drive circuit 360 or be coupled to comparator 312 etc. reaches dimming function, and this is known by the general knowledge person who knows this area.
Because it is different that the variation of the terminal voltage of fluorescent lamp starting process is understood along with the state of the kind of ambient temperature, light conditions, fluorescent lamp and fluorescent lamp, for fear of the judgement fluorescent tube starting that utilizes light tube electric voltage the chance of any erroneous judgement is arranged, can will have the in addition state of auxiliary judgment fluorescent lamp of known lamp tube status indicating signal CS now.
Consult Fig. 5, be another embodiment of lamp tube status judgement circuit 370 according to the present invention.Compare with the embodiment of Fig. 4, lamp tube status judgement circuit more than 370 determining device 377c, in order to a lamp tube status indicating signal CS and a reference voltage Vref 4 are compared, wherein this lamp tube status indicating signal CS is the detection signal for the electric current of detecting fluorescent lamp 304.After lamp tube status indicating signal CS surpasses reference voltage Vref 4, send the signal S17 of high levle, make through or (OR) the signal S15 of output high levle behind logic 375a, the 375b.Heavy shown in the curve d of Fig. 3 when the starting of fluorescent lamp, then before the predetermined time delay of delay circuit 374 did not arrive, fluorescent tube started; Perhaps the setting of voltage V2 is low excessively, can't detect fluorescent lamp 304 terminal voltages and fall after rise after the starting between voltage V1 and the V2, and the auxiliary judgment that sees through lamp tube status indicating signal CS can be avoided the problems referred to above.Owing to the problem that existing known lamp current meeting due to leakage current is difficult for measuring, compared to existing prior art, present embodiment is to judge for assisting with the detection signal of lamp current, the erroneous judgement that has caused so still can avoid due to leakage current.
Consult Fig. 6, be the another embodiment of lamp tube status judgement circuit 370 according to the present invention.Compare with the embodiment of Fig. 4, lamp tube status judgement circuit more than 370 inverter 379d, 379e and fasten lock circuit 371d, it is in order to judge according to signal S14 whether fluorescent tube starts.Because fluorescent tube is if start, then load current signal S4 can improve, and makes the output signal S3 of error amplifier 311 be lower than the reference voltage Vref 3 of comparator 344 in the protective circuit 340, and making signal S14 is low level.In other words, after the fluorescent tube starting, because the existence of feedbacking signal S4 is arranged, the accurate position that makes signal S3 is less than the accurate position of the crest of triangular wave signal S1.
In this embodiment, the scheduled delay of delay circuit 374a is to be charged by error amplifier 311 according to electric capacity 313, makes accurate the required time of standard position that is charged to reference voltage Vref 3 by the trough standard position of triangular wave signal S1 of signal S3.When through behind this scheduled delay, see through inverter 379d, make and fasten lock circuit 371d and get back to the normal operation state by Reset Status.This moment, making signal S14 was low level as long as fluorescent lamp 304 starts, and then saw through inverter 379e output high levle signal.So, the output signal of fastening lock circuit 371d can pin in high levle, and makes lamp tube status judgement circuit 370 outputs represent the high levle signal S15 of fluorescent lamp conducting.
Consult Fig. 7, be an embodiment again of lamp tube status judgement circuit 370 according to the present invention.It is as the embodiment of Fig. 6, judges with signal S14 whether fluorescent lamp starts, and whether difference is in judged result is to make delay circuit 374 enter the state of reseting in order to decision.When signal S5 surpasses voltage V1, and send the high levle signal behind the scheduled delay of delayed circuit 374a.See through inverter 379e, fasten lock circuit 371d and begin normal operation.This moment is if signal S14 still is a high levle, then sees through inverter 379d, fastens lock circuit 371d and inverter 379f output high levle signal.So, or logic 375c output high levle signal still reseting state.So, the scheduled delay that can avoid delay circuit 374 to and infer that fluorescent tube has started, make after frequency generator 320 frequency conversions just the situation that fluorescent tube in fact still makes frequency generator 320 for starting but also becomes the fluorescent tube starting frequency of judging not only.
Consult Fig. 8, be the another embodiment of lamp tube status judgement circuit 370 according to the present invention.Because the variation meeting of fluorescent tube starting process terminal voltage has difference with various situations, the embodiment among Fig. 4 judges to fall after rise again after whether the fluorescent tube terminal voltage once surpassed with voltage V2 and judges, if the inappropriate meeting of selection of voltage V2 causes the difficulty in the judgement.So can increase the judgement voltages of many groups, with judge light tube electric voltage prestarting surpass a certain magnitude of voltage and falling after rise after the starting characteristic under this magnitude of voltage that arrives.Be to increase determining device 377c and corresponding lock circuit 371d, 371e and inverter 379d, the 379e of fastening judges variation relation between signal S5 and voltage V3 among Fig. 8.Its deterministic process is not repeated at this as the deterministic process of voltage V2 among Fig. 4.
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, though the present invention discloses as above with preferred embodiment, yet be not in order to limit the present invention, any those skilled in the art, in not breaking away from the technical solution of the present invention scope, when the technology contents that can utilize above-mentioned announcement is made a little change or is modified to the equivalent embodiment of equivalent variations, in every case be the content that does not break away from technical solution of the present invention, according to technical spirit of the present invention to any simple modification that above embodiment did, equivalent variations and modification all still belong in the scope of technical solution of the present invention.
Claims (24)
1. AC in order to drive a load, is characterized in that this DC/AC conversion driving circuit comprises:
One switching device is to couple a direct current power supply;
One resonant slots is to couple this switching device and this load, will become an AC signal from the power conversions of this DC power supply of this switching device, to drive this load;
One voltage detection circuit couples this load, produces a detecting voltage signal with the voltage according to this load; And
One controller is to couple this voltage detection circuit and this switching device, and sees through the electric power size that this switching device control is passed to this DC power supply of this resonant slots;
Wherein, this controller determines whether changing its frequency of operation based on this detecting voltage signal.
2. AC according to claim 1 is characterized in that wherein said controller after this detecting voltage signal surpasses one first scheduled time length greater than one first predetermined value, changes its frequency of operation.
3. AC according to claim 1 is characterized in that wherein said controller after this detecting voltage signal is greater than one second predetermined value, begins decision and whether changes its frequency of operation.
4. AC according to claim 3 is characterized in that wherein said controller after this detecting voltage signal is greater than one the 3rd predetermined value, begins decision and whether changes its frequency of operation.
5. according to claim 2,3 and 4 each described AC, it is characterized in that wherein said controller more receives a brightness adjustment control signal, and when changing frequency of operation, the electric power size of this DC power supply that is passed to this resonant slots is regulated in beginning according to this brightness adjustment control signal.
6. AC according to claim 1 is characterized in that wherein said controller more determines whether stopping to transmit the electric power of this DC power supply to this resonant slots based on this detecting voltage signal.
7. AC according to claim 1 is characterized in that wherein said controller after one second scheduled time length, if decision does not change its frequency of operation, then stops to transmit the electric power of this DC power supply to this resonant slots.
8. AC according to claim 1, it is characterized in that more comprising one first current-sensing circuit, this current-sensing circuit couples this load, produce one first current sense signal with the electric current according to this load, wherein this controller is passed to the electric power size of this DC power supply of this resonant slots according to this first current sense signal adjustment.
9. AC according to claim 8 is characterized in that wherein said controller after this first detecting voltage signal is greater than one first predetermined value, more determines whether changing its frequency of operation based on this detecting voltage signal.
10. AC according to claim 1, it is characterized in that more comprising one second current-sensing circuit, this current-sensing circuit couples this load, produce a lamp tube status indicating signal with electric current according to this load, wherein this controller more determines whether changing its frequency of operation based on this lamp tube status indicating signal after this first detecting voltage signal is greater than one first predetermined value.
11. a controller, in order to control an AC to drive a load, this controller comprises:
One frequency generator is in order to produce a reference signal;
One pulse width regulating circuit couples this frequency generator, and adjusts signal according to this reference signal to produce a pulsewidth;
One drive circuit couples this pulse width regulating circuit and adjusts signal to produce a plurality of driving signals according to this pulsewidth; And
One lamp tube status judgement circuit comprises one first decision circuitry, and whether this first decision circuitry produces one first judgement signal according to a detecting voltage signal and one first reference voltage with decision;
Wherein this frequency generator first judges whether signal adjusts the frequency of this reference signal with decision based on this.
12. controller according to claim 11, it is characterized in that wherein said lamp tube status judgement circuit more comprises one second decision circuitry, whether this second decision circuitry produces one second according to this detecting voltage signal and one second reference voltage with decision is judged signal, and this frequency generator more second judges that signal is to determine whether to adjust the frequency of this reference signal based on this.
13., it is characterized in that wherein said first decision circuitry produces this first judgement signal after this detecting voltage signal is greater than this first reference voltage according to the controller that claim 12 is stated.
14., it is characterized in that wherein said second decision circuitry produces this at this detecting voltage signal and second judges signal greater than this second reference voltage and during again less than this second reference voltage according to the controller that claim 12 is stated.
15. the controller of stating according to claim 14, it is characterized in that wherein said second decision circuitry produces one first replacement signal to this first decision circuitry at this detecting voltage signal during greater than this second reference voltage, whether this first decision circuitry more produces this based on this first replacement signal with decision first is judged signal.
16. the controller of stating according to claim 15, it is characterized in that wherein said lamp tube status judgement circuit more comprises one the 3rd decision circuitry, whether the 3rd decision circuitry produces one the 3rd judgement signal according to this detecting voltage signal and one the 3rd reference voltage with decision, and this frequency generator more judges based on the 3rd whether signal adjusts the frequency of this reference signal with decision.
17., it is characterized in that wherein said the 3rd decision circuitry produces the 3rd at this detecting voltage signal and judges signal greater than the 3rd reference voltage and during again less than the 3rd reference voltage according to the controller that claim 16 is stated.
18. the controller of stating according to claim 17, it is characterized in that wherein said the 3rd decision circuitry produces one second replacement signal to this first decision circuitry at this detecting voltage signal during greater than the 3rd reference voltage, whether this first decision circuitry more produces this based on this second replacement signal with decision first is judged signal.
19. the controller of stating according to claim 12, it is characterized in that wherein said lamp tube status judgement circuit more comprises one the 3rd decision circuitry, whether the 3rd decision circuitry produces one the 3rd judgement signal according to a lamp tube status indicating signal and one second reference voltage with decision, this frequency generator is more judged signal to determine whether to adjust the frequency of this reference signal based on the 3rd, and wherein this lamp tube status indicating signal is in order to indicate the current value of this load.
20. controller according to claim 11, it is characterized in that wherein said pulse width regulating circuit produces error amplification signal according to a back coupling signal and one second reference voltage, this first decision circuitry more amplifies signal according to this error and whether one the 3rd reference voltage produces this first judgement signal with decision.
21. controller according to claim 12 is characterized in that more comprising a timer, this timer produces the time to signal after a scheduled time.
22. controller according to claim 21 is characterized in that more comprising a protective circuit, this protective circuit couples this drive circuit, whether sends a protection signal in order to decision, and based on this time to signal to determine whether to come into operation.
23. controller according to claim 22; it is characterized in that wherein said lamp tube status judgement circuit first judges signal and this second judges whether signal sends an abnormal signal with decision, and this protective circuit receives this abnormal signal and sends this protection signal in view of the above based on this.
24. controller according to claim 12, it is characterized in that more comprising a light adjusting circuit, this light modulation signal receives a brightness adjustment control signal, and based on this first judge signal and this second judge signal with decision whether according to these a plurality of driving signals of this brightness adjustment control signal adjustment.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006101451988A CN101193486A (en) | 2006-11-17 | 2006-11-17 | Lamp tube status judgement circuit and its controller |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2006101451988A CN101193486A (en) | 2006-11-17 | 2006-11-17 | Lamp tube status judgement circuit and its controller |
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| CN101193486A true CN101193486A (en) | 2008-06-04 |
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| CNA2006101451988A Pending CN101193486A (en) | 2006-11-17 | 2006-11-17 | Lamp tube status judgement circuit and its controller |
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| US8305013B2 (en) | 2010-07-12 | 2012-11-06 | O2Micro International Limited | Circuits and methods for controlling dimming of a light source |
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