CN101420810A - Lighting device and illumination apparatus - Google Patents
Lighting device and illumination apparatus Download PDFInfo
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- CN101420810A CN101420810A CNA2008101717618A CN200810171761A CN101420810A CN 101420810 A CN101420810 A CN 101420810A CN A2008101717618 A CNA2008101717618 A CN A2008101717618A CN 200810171761 A CN200810171761 A CN 200810171761A CN 101420810 A CN101420810 A CN 101420810A
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- lamp
- pwm signal
- cycle
- inverter circuit
- ignition device
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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
The invention relates to a lighting apparatus and an illuminating appliance. The lighting apparatus comprises: an inverter circuit for converting direct current voltage into high frequency voltage and outputting for lighting the lamp; a state detecting unit for detecting the lamp state; a calculating unit for calculating the cycle of the PWM signal which actuates the inverter circuit at least according to the lamp lighting state detected by the detecting unit and a defined action clock; a signal generating unit which is constructed to be able to generate PWM signal corresponding to the non-integral number of times period of the defined action clock and PWM signal corresponding to the period calculated by the calculating unit; and a control unit for controlling the driving of the inverter circuit according to the PWM signal generated by the signal generating unit. The illuminating appliance comprises: a main body equipped with a lamp; and a lighting apparatus of the invention for controlling the lamp lighting. In the invention, fine modulated light control is enabled without stopping other processing regardless of operation clocks.
Description
Technical field
The present invention relates to a kind ofly make ignition device that lamp lights a lamp and the ligthing paraphernalia that possesses this ignition device by inverter circuit (Inverter Circuit).
Background technology
Generally speaking, the ignition device that possesses inverter circuit is to constitute as follows, promptly, the state of lighting a lamp or supply voltage according to lamp, come the switch periods (switchingcycle) to switch element or the duty ratio (duty ratio) of switch to control, can lamp be lit a lamp with fixing brightness thus.
In recent years, along with the development of various digital devices (digital device), in order to carry out digital control and increased to ignition device from described ignition device being controlled through digitized external equipment.In the case, generally speaking be with the in addition digitlization of the control device of the driving of control inverter circuit, with in addition digitlization of control device, and can easily obtain required control characteristic by like this, also can expect to respond quick control.
For as through digitized control device, be digital signal processing device (digital signalprocessor, DSP), utilize digital operation to handle and generate pulse-width modulation (Pulse-Width Modulation, PWM) signal that supplies to inverter circuit.When carrying out this kind digital operation processing, the state of lighting a lamp of supply voltage or lamp etc. is detected, and generate pwm signal according to this detection, and this pwm signal is input in the inverter circuit, comes thus the some modulation frequency of for example lamp or the duty of output voltage (on duty) etc. is controlled and lamp is stably lit a lamp.
Yet, generating under the situation of pwm signal handling by digital operation like this, exist cycle of pwm signal to depend on the problem of the Action clock (operation clock) of digital signal processing device.That is, under the less relatively situation of the Action clock of this digital signal processing device, in other words, under the situation of control unit that is low speed, be not easy to carry out trickle FREQUENCY CONTROL.
On the other hand, if the Action clock of digital signal processing device is improved, then there is the problem that electric power increases or cost rises that consumes that makes.
Therefore, for example having as everyone knows, the Japan Patent spy opens the method shown in the 2000-150180 communique, that is, (interrupt handling) makes digital signal processing device stop in specified time limit by Interrupt Process, and the cycle to pwm signal is adjusted in this stopping period thus.
Yet, in the described ignition device, when the cycle of pwm signal is adjusted, digital signal processing device is stopped, therefore this adjustment period between in existence can't utilize digital signal processing device to carry out the problem of other processing.
Summary of the invention
The present invention finishes in view of described problem, and its purpose is to provide a kind of and is not subjected to the Action clock restriction, need not stop the ligthing paraphernalia that other processing just can be carried out the ignition device of extremely fine brightness adjustment control and possess this ignition device.
Ignition device of the present invention comprises: inverter circuit is converted to direct voltage output behind the high frequency voltage and lamp is lit a lamp; State detection unit detects the state of lighting a lamp of lamp; Arithmetic element, at least according to by the state of lighting a lamp and the specified action clock of the detected lamp of described state detection unit, and computing is sent as an envoy to cycle of pwm signal of inverter circuit action; The signal generation unit constitutes the corresponding pwm signal of non-integral multiple cycle that can generate with the specified action clock, and generates the pwm signal in the cycle that is calculated by arithmetic element; And control unit, the pwm signal according to being generated by described signal generation unit comes inverter circuit is carried out drive controlling.
For lamp, (Light-Emitting Diode LED) etc., but is not limited to these can to use the low-pressure mercury discharge lamp of fluorescent lamp (fluorescent lamp) etc. or light-emitting diode.
For inverter circuit, for example can use the inverter circuit of half-bridge (halfbridge) type of possessing paired switch element etc., but be not limited thereto.
State detection unit is by detecting the lamp current of for example lamp or modulating voltage etc., and can the state of lighting a lamp of lamp be detected.
Arithmetic element is for example will be converted to after discrete digital signal and obtain A/D (Analog/Digital, the analog/digital) transducer etc. in the cycle of pwm signal as the lamp current of the analog signal (analog signal) of lamp or modulating voltage.
The signal generation unit is the microprocessor (microprocessor of personal computer etc. for example, MPU) (arithmetic element), and be digital section, this digital section is moved with the corresponding sequential of Action clock that is generated with the Action clock generating unit, and generates corresponding with the state of lamp etc. and the cycle is the non-integral multiple pwm signal of Action clock.
Control unit is for example to be connected high-side driver (highside driver) on the switch element of inverter circuit etc.
And, according to by the state of lighting a lamp of the detected lamp of state detection unit and specified action clock etc., calculate the cycle of pwm signal, utilization can generate the signal generation unit with the non-integral multiple corresponding pwm signal of cycle of specified action clock, generate the pwm signal in the described cycle that calculates, be not subjected to the Action clock restriction thus, need not stop the periodicity variation fine continuously that other processing just can make pwm signal, thereby can carry out extremely fine brightness adjustment control.
And, in the ignition device of the present invention, the signal generation unit alternately produces first edge (edge) and second edge, described first edge is that with the rising of specified action clock and in descending any is corresponding and move, described second edge is between the rise and fall with the specified action clock, and descend with rising between in any is corresponding and export.
In first edge and second edge any is rising edge edge (rising edge), and another then is that trailing edge is along (falling edge).
And, the signal generation unit alternately produces first edge and second edge, described first edge is that with the rising of specified action clock and in descending any is corresponding and move, described second edge is between the rise and fall with the specified action clock, and descend with rising between in any is corresponding and export, thus can be between second edge cycle to pwm signal control, and can be between first edge duty ratio of pwm signal be set at fixed value arbitrarily.
In addition, in the ignition device of the present invention, inverter circuit comprises switch element, the switch motion of the corresponding switch element of cycle by the pwm signal that generated with the signal generation unit, direct voltage is converted to high frequency voltage, so that less than the mode of 2V lamp is lit a lamp with the excursion (variation range) of the cycle minimal decomposition width corresponding output voltage of pwm signal.
So-called cycle minimal decomposition width is meant from the rising of the minimum pulse of pwm signal to begin width till descend.
And inverter circuit is so that make discharge lamp lighting with the excursion of the cycle minimal decomposition width corresponding output voltage of pwm signal less than the mode of 2V, even if also can stably carry out light modulation for the higher relatively discharge lamp of output voltage thus.
In addition, in the ignition device of the present invention, the signal generation unit carries out FEEDBACK CONTROL (feedback control) to inverter circuit thus according to the desired value of being set regulation by the state of lighting a lamp of the detected lamp of state detection unit.
And, according to the state of lighting a lamp by the detected discharge lamp of state detection unit, the desired value of regulation of coming the setting signal generation unit can drive inverter circuit corresponding to the lighting a lamp state of discharge lamp thus efficiently so that inverter circuit is carried out FEEDBACK CONTROL.
In addition, in the ignition device of the present invention, the signal generation unit is set at the cycle of pwm signal below the 20 μ sec (microsecond), and the cycle of the FEEDBACK CONTROL of inverter circuit is set at below the 100 μ sec (microsecond).
And, be set at below the 20 μ sec by cycle, and the cycle of the FEEDBACK CONTROL of inverter circuit is set at below the 100 μ sec pwm signal, then can further improve the response of inverter circuit.
In addition, in the ignition device of the present invention, the signal generation unit carries out in each cycle the FEEDBACK CONTROL of inverter circuit.
And the signal generation unit carries out in each cycle the FEEDBACK CONTROL of inverter circuit, can further improve the response of inverter circuit thus.
In addition, ligthing paraphernalia of the present invention comprises appliance body that lamp is installed and described any ignition device that lamp is lit a lamp and controlled.
For ligthing paraphernalia, can be throw light on outside the room usefulness, room lighting with, general lighting with, show any ligthing paraphernalia of using etc., its shape then can be different shape.And ignition device can be one or separate with appliance body.
And, by possessing described any ignition device, can realize each effect.
In sum, the invention provides a kind of Action clock that is not subjected to and limit, need not stop the ignition device that other processing just can be carried out extremely fine brightness adjustment control.The dim signal generating unit calculates the cycle of pwm signal according to by the state of lighting a lamp of the detected lamp of state-detection portion and specified action clock etc.Utilization can generate the dim signal generating unit with the non-integral multiple corresponding pwm signal of cycle of Action clock, generates the pwm signal in the cycle that is calculated by the dim signal generating unit.Be not subjected to the Action clock restriction, need not stop the cycle variation fine continuously that other processing just can make pwm signal, thereby can carry out extremely fine brightness adjustment control.
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 of the ignition device of an expression example of the present invention.
Fig. 2 is the bottom view of a part of representing to possess the ligthing paraphernalia of ignition device with the cross section.
Fig. 3 A is the sequential chart of the relation of expression Action clock of described ignition device and pwm signal.
Fig. 3 B amplifies the part of the sequential chart of Fig. 3 A and the key diagram of expression.
Fig. 4 is the sequential chart of action of the power supply unit of expression ignition device.
Fig. 5 is the figure of the relation of action cycle of inverter circuit of the common ignition device of expression and modulating voltage.
Fig. 6 is the form of difference of the modulating voltage of dividing according to output resolution ratio of the described ignition device of expression.
Fig. 7 be with form shown in Figure 6 in the corresponding figure of each minimum resolution.
11: ligthing paraphernalia 12: lamp
13: four edges 14: bight
15: luminous tube 16: socket
21: appliance body 23: top plate portion
23a: ignition device installation portion 24: side plate
25: frame portion 26: peristome
31: ceiling attendant equipment fixing body 33: side surface part
37: lamp incorporating section 40: the power supply input side
41: lamp outlet side 42: discharge lamp ignition device
43: power patch panel 44: lamp socket
51: power supply unit 52: inverter circuit
53: resonant circuit 55: preheat circuit
56: digital signal processing device 57: lamp circuit
58: main circuit 59: boost chopper circuit
61: trigger 63: analog comparator
64: copped wave control part 65: high-side driver
71: voltage configuration part 72: the preheat circuit control part
73: state-detection portion 74: the dim signal generating unit
76: clock generating unit BD: diode
C1～C7: electrolytic capacitor CLK: Action clock
D1, D2: diode e: commercial ac power source
FLa, FLb: filament I: electric current
I0: input current IQ: switching current
IL: lamp current IP: preheat curent
I1: output current L1: chopper choke
L2: resonance coil L3: preheating transformer
L1a, L1b: primary coil L3a: primary coil
L3b: the first secondary coil L3c: second subprime coil
P, PP, P1, P2:PWM signal Q1, Q2, Q3, Q4: field-effect transistor
R1, R2, R3, R4: resistance SP: switching pulse
V: voltage V0, V1: input voltage
VL: modulating voltage VQ: voltage
VR: resetting voltage VTH: reference voltage
A: width
Embodiment
As shown in Figure 2, ceiling imbedded formula ligthing paraphernalia 11 as ligthing paraphernalia, it is the ceiling imbedded formula ligthing paraphernalia that for example is arranged on the furred ceiling (system ceiling) that T-bar (T bar) is combined with grid (grid) shape, it uses the lamp 12 of quadrangular ring-shaped (square ring-type) to be used as becoming the lamp as light source (discharge lamp) of load, that is, as the lamp of polygon ring-type.Described lamp 12 for example is that caliber is the lamp of 15mm～18mm, and comprises: luminous tube 15, and it forms quadrangular ring-shaped, and has with the four edges 13 of linearity and with four bights 14 that connected with approximate right angle between the end of these four edges 13; And socket 16, it is connected the two ends of luminous tube 15 and is being formed the coldest portion nearby in one side of described luminous tube 15 central authorities, the side-prominent not shown connecting pin (connecting pin) that is being provided with of the inner peripheral surface of described socket 16, this connecting pin is connected not shown electrode set on the two ends of luminous tube 15.
And, ceiling imbedded formula ligthing paraphernalia 11 has appliance body 21, this appliance body 21 forms the quadrangle case shape of lower surface opening, and possess the top plate portion 23 of quadrangle shape, the side plate 24 that is bent to form downwards from the circumference of this top plate portion 23 and be bent to form frame portion 25 around the lower end of this side plate 24 with L word shape roughly.The overall dimension of the frame portion 25 of described appliance body 21 forms the inside dimension of imbedding opening of being surrounded by the T-bar of furred ceiling less than all around.
Forming the peristome 26 of quadrangle shape at the middle section opening of top plate portion 23, the lower face side of this peristome 26 utilizes screw cramp (screw cramp) etc. ceiling attendant equipment fixing body 31 releasably to be installed in the lower surface of top plate portion 23.
Between the side surface part 33 of top plate portion 23, side plate 24 and the ceiling attendant equipment fixing body 31 of appliance body 21, forming the lamp incorporating section 37 of the quadrangular ring-shaped of lower surface opening, and in this lamp incorporating section 37, taking in and disposing lamp 12.
In addition, lower surface at the top plate portion 23 of appliance body 21, edge portion on one side of peristome 26 is the ignition device that is installed with on the ignition device installation portion 23a as load control device, be discharge lamp ignition device 42 (below be called ignition device 42), this discharge lamp ignition device 42 is disposing power supply input side 40 on an end of the edge portion of described peristome 26, and on the other end, disposing lamp outlet side 41, power supply input side 40 at ignition device 42, the edge portion on the limit that intersects on the one side with the peristome 26 that ignition device 42 is installed is installed with power patch panel (terminal block) 43, lamp outlet side 41 at ignition device 42, with the limit of the peristome 26 that power patch panel 43 is installed the edge portion on relative limit lamp socket (lamp socket) 44 is installed, the lamp socket (lampholder) that this lamp socket 44 connects the socket 16 of lamps 12 and is also used as the socket 16 that is releasably keeping lamp 12.Ignition device 42 and power patch panel 43 are disposed at the inboard of ceiling attendant equipment fixing body 31, and are covered with peristome 26 linings.
And, as shown in Figure 1, in the ignition device 42, commercial ac power source e is being carried out connecting inverter circuit 52 on the level and smooth power supply unit of rectification 51, connecting filament (filament) FLa, the FLb of lamp 12 at the output of this inverter circuit 52 via resonant circuit (resonant circuit) 53.And, on the connecting portion of inverter circuit 52 and resonant circuit 53, be connected the preheat circuit (preheat circuit) 55 of filament FLa, the FLb of lamp 12.And then, connecting circuit control unit on power supply unit 51, inverter circuit 52 and the preheat circuit 55, be digital signal processing device 56 (below be called DSP56) as control device.And, constitute lamp circuit 57 by commercial ac power source e, power supply unit 51, inverter circuit 52, resonant circuit 53, preheat circuit 55 and DSP56 etc., and constituted main circuit (main circuit) 58 by described lamp circuit 57 is connected with lamp 12 as operating circuit (operating circuit).
Chopper choke L1 has primary coil (primary winding) L1a and secondary coil (secondary winding) L1b, primary coil L1a is connected between the anode of the outlet side of bridge diode BD and diode D1, and the distolateral ground wire (earth) that is connected in of secondary coil L1b, another distolateral sequential circuit (sequence circuit) that is connected in as the control signal generating unit via the resistance R 1 that detects usefulness is the set terminal (set terminal) of trigger (flipflop) 61.Therefore, the choke voltage V that is resulted from resistance R 1 by the choke electric current I is input to the set terminal of trigger 61 from the secondary coil L1b of chopper choke L1.
Among the field-effect transistor Q1, drain electrode (drain) terminal is connected on the tie point of anode of chopper choke L1 and diode D1, and source electrode (source) terminal is connected in ground wire via resistance R 2, and, be connected on the lead-out terminal of trigger 61 as grid (gate) terminal of control terminal.
At this, trigger (flip-flop) the 61st, so-called reset-set (reset-set, RS) trigger of type is that the lead-out terminal of analog comparator (analog comparator) 63 is connected on the reseting terminal (reset terminal) as the comparator of operational amplifier (operational amplifier).In this analog comparator 63, one of them input terminal is connected on the tie point of the drain terminal of field-effect transistor Q1 and resistance R 2, and input has the voltage VQ that is resulted from by the switching current IQ of field-effect transistor Q1 in the resistance R 2, and another input terminal is connected on the DSP56 via resistance R 3, and is connected in ground wire with the tie point of described resistance R 3 via capacitor C2.
And, be made of boost chopper circuit control unit as switching pulse (switching pulse) generative circuit these triggers 61 and analog comparator 63 etc., be copped wave control part 64, this copped wave control part 64 comes the action of boost chopper circuit 59 is controlled according to the zero current phase place and the switching current IQ of choke electric current I.
In addition, inverter circuit 52 is inverters of so-called semi-bridge type, the switch element that will use as the inverter of second switch element, is that field-effect transistor Q2, Q3 are connected in series on the power supply unit 51.
Among field-effect transistor Q2, the Q3, as the gate terminal of control terminal via being connected on the DSP56, and according to connect disconnection (on-off) control from described high-side driver 65 signal supplied as the high-side driver 65 of control unit.
High-side driver 65 is according to the pwm signal P that uses from the light modulation that DSP56 supplied with, with the frequency about tens of kHz～200kHz, for example (cycles below the 20 μ sec) more than the 50kHz in this example, and make field-effect transistor Q2, Q3 alternately connect disconnection (carrying out switch drive), between drain electrode-source electrode of field-effect transistor Q3, produce the high-frequency ac (high-frequency alternating Current) of regulation thus.
Preheat circuit 55 possesses the series circuit of the resistance R 4 that preheating uses with the field-effect transistor Q4 and the current detecting of switch element with transformer L3, capacitor C5, as preheating, is being connected diode D2 between the source terminal of the tie point of capacitor C5 and field-effect transistor Q4 and field-effect transistor Q2.
Preheating is with among the transformer L3, the primary coil L3a and the first secondary coil L3b and second subprime coil L3c are disposing in opposite directions, primary coil L3a is connected between the tie point and resonance electricity consumption container C 4 of field-effect transistor Q2, Q3, and each secondary coil L3b, L3c are connected on filament FLa, the FLb of lamp 12 via capacitor C6, C7.
Among the field-effect transistor Q4, be connected on the DSP56, according to carrying out switch control with pwm signal from the preheating that described DSP56 supplied with as the gate terminal of control terminal.
And, DSP56 is the MPU (arithmetic element) that carries out the so-called personal computer etc. of Digital Signal Processing, inside possesses integratedly: as reference voltage (referencevoltage) configuration part of reference waveform configuration part, be voltage configuration part 71, be connected with the input terminal of analog comparator 63; Preheat circuit control part 72 is controlled in order to the switch to the field-effect transistor Q4 of preheat circuit 55; State-detection portion 73 with function of state detection unit, by to discharging current be lamp current IL and discharge voltage be among the modulating voltage VL any detects and the operate condition (operate condition of main circuit 58) of lamp circuit 57 and lamp 12 is detected at least; And as the inverter circuit control part of signal generation unit, be dim signal generating unit 74 etc., this dim signal generating unit 74 is according to the pwm signal P of the action control usefulness of the field-effect transistor Q2, the Q3 that generate inverter circuit 52 through described state-detection portion 73 detected operate conditions; And possess respectively read-only memory as not shown memory cell (read only memory, ROM), random asccess memory (randomaccess memory, RAM), as I/O (Input/Output, I/O) port of interface etc.In addition, each one of described DSP56 moves with following sequential, and this sequential depends on the Action clock CLK that is generated by the clock generating unit 76 as the Action clock generation unit.
In addition, so-called DSP56 possesses voltage configuration part 71, preheat circuit control part 72 integratedly, reaches dim signal generating unit 74 etc., is meant described each total software (software) processing section in DSP56.
Particularly, in this example, shown in Fig. 1 and Fig. 3 A, reference voltage VTH is set at as follows: in the mode that disconnects according to the size that is input to the voltage VQ of analog comparator 63 and reference voltage VTH, utilization is as the mains voltage waveform through rectification of reference waveform SW, generate be used for so that output voltage V 1 near the mode of required desired value carry out the control signal of FEEDBACK CONTROL, promptly as the switching pulse SP of the field-effect transistor Q1 of pwm control signal.In addition, reference waveform SW can corresponding to from the output voltage V 1 (output current I1) of for example inverter circuit 52 and the supply voltage at least any and change.
In other words, ignition device 42 generates the reference voltage VTH of switch of the PFC control usefulness of power supply unit 51 by DSP56, and generates with so that the switching pulse SP of field-effect transistor Q1 switch (switching) by the copped wave control part 64 that the hardware by trigger 61 or analog comparator 63 etc. constitutes.
Preheat circuit control part 72 is the software portions with function of the preheat curent detecting unit that the preheat curent IP to preheat circuit 55 detects, following by the variation of any at least among 73 detected lamp current IL of state-detection portion and the modulating voltage VL when preheat curent IP monitors to preheat circuit 55, setting best preheating condition by this way is desired value, and so that preheat curent IP generates the preheating pwm signal PP in the gate terminal of the field-effect transistor Q4 that supplies to preheat circuit 55 near the mode of desired value.In addition, described preheat circuit control part 72 for example also can be followed as the variation of the long-pending lamp electric power of lamp current IL and modulating voltage VL or the variation of environment temperature and be waited the target setting value.And, for this desired value, following higher limit is set preferably, that is, even if this higher limit is to set according to the energy that also can not have problems when the end of lifetime of for example filament FLa, FLb.
State-detection portion 73 has the function of A/D converter, promptly, will as among the lamp current IL of analog signal and the modulating voltage VL any is converted to the frequency data with described lamp current IL or the corresponding numeral of modulating voltage VL at least, and will be in the lamp current IL of A/D conversion and modulating voltage VL any outputs in preheat circuit control part 72 or the dim signal generating unit 74 etc. at least.The sequential of lamp current IL in the described state-detection portion 73 or the detection of modulating voltage VL, be according to any analog signal at least in the main circuits such as both end voltage 58 of mains voltage waveform for example or resonance electricity consumption container C 4 or based on the frequency data that calculate by described state-detection 73 detected lamp current IL of portion or modulating voltage VL etc. as the regulation of digital signal, and decision for the synchronous sequential of peak phase (peak phase) of lamp current IL or modulating voltage VL.In this example, for example state-detection portion 73 has the function of A/D converter, therefore be the detection sequential that decides lamp current IL or modulating voltage VL according to the frequency data as the regulation of digital signal, the frequency data of wherein said regulation as digital signal are the data that calculate according to lamp current IL or modulating voltage VL etc.
And, dim signal generating unit 74 is following software portions: have the function of arithmetic element and generate the pwm signal P in the described cycle that calculates, the function of described arithmetic element is according to the state of lighting a lamp by state-detection portion 73 detected lamps 12, be among lamp current IL and the modulating voltage VL at least any, and calculate cycle of pwm signal P according to this light a lamp state and Action clock CLK.
At this, for the pwm signal P that generates by described dim signal generating unit 74, be by alternately exporting first edge and second edge, and between first edge, set the duty (duty) of pwm signal P, and between second edge, set the cycle of pwm signal P, wherein said first edge is meant that the duty ratio of described pwm signal P depends on Action clock CLK, i.e. any corresponding to the rising of Action clock CLK or in descending and moving, in other words be the integral multiple of Action clock CLK, described second edge is meant that the duty ratio of described pwm signal P does not rely on Action clock CLK, promptly and between the rise and fall of Action clock CLK, perhaps descend with rising between any is corresponding, in other words be the non-integral multiple of Action clock CLK.
Particularly, shown in Fig. 3 A and Fig. 3 B, (width is (Ti=ani+bi a) divided by Action clock CLK with the period T i of the pwm signal P that calculates for dim signal generating unit 74, ni, i is a natural number, a〉bi), and carry out Interrupt Process along corresponding sequential with rising edge with Action clock CLK, second edge that produces pwm signal P along postponing retardation ci-1 is arranged with respect to the rising edge of Action clock CLK, wherein said retardation ci-1 is the division arithmetic (Ti-1=ani-1+bi-1 from Ti-1 of last one-period, ni-1 is a natural number) amount that rising postponed of the Action clock CLK of the decimal bi-1 that produces, and the decimal bi that the division arithmetic by current period Ti produces and because of retardation ci-1 the trailing edge of second edge and Action clock CLK along between the difference of the decimal di that produced, become from the delay ci that rising postponed of the Action clock CLK of next period T i+1.That is to say bi-di=ci, ci-1+di=a.First edge utilizes the duty of pwm signal P and obtains.
In addition, between the edge of the pwm signal P2 that edge and the field-effect transistor Q3 of the pwm signal P1 that field-effect transistor Q2 uses use, forming (dead area) between not shown some dead bands.In addition, first edge of pwm signal P1 (pwm signal P2) becomes the trailing edge edge, and second edge becomes the rising edge edge, even if described first edge and described second edge are opposite with described situation too.
That is to say, dim signal generating unit 74 has the function of duty configuration part, that is: according to following decimal di, so that the mode of the duty ratio of the pwm signal P of current period (duty ratio) almost fixed is set retardation ci, wherein said decimal di be utilize the one-period of lasting pwm signal P duty (duty or non-duty) and produce the decimal of the sequential (pulse duration of pwm signal P) of the edge of the pulse that makes pwm signal P reversing with respect to the edge of Action clock CLK, the periodic Control of described pwm signal P is to carry out in each cycle, perhaps in specified period, for example 100 μ sec cycles carried out with interior every several cycles.
Therefore, for dim signal generating unit 74, though the sequential at first edge of pwm signal P is to depend on Action clock CLK in this example, but the sequential at second edge does not also rely on Action clock CLK but can change, thus, make duty (non-duty) with the independent sequential of Action clock CLK and can change, and can be can be the periodic Control of pwm signal P corresponding to integral multiple and non-integral multiple (the PFM control) of Action clock CLK.In other words, dim signal generating unit 74 is the duty of pwm signal P can be changed the converting unit that the cycle that is converted to changes (frequency change).
At this, used in the ignition device 42 of resonance effect of resonant circuit 53, as shown in Figure 5, with respect to the cycle (switch periods of field-effect transistor Q2, Q3) of pwm signal P, the variation of modulating voltage VL increases.Therefore, when inverter circuit 52 being carried out when digital control, output becomes stepped, lights a lamp thereby be not easy to stablize, and then when making cycle delay or carrying out FEEDBACK CONTROL, is not easy equally to stablize to light a lamp.Particularly, resonance is made as 1.4mH, the electric capacity of resonance electricity consumption container C 4 is made as under the situation of 3300pF with the inductance (inductance) of coil L2 shown in the form of Fig. 6 and Fig. 7 for example, when the variation range delta VL with the corresponding modulating voltage VL of cycle minimal decomposition width (minimum resolution (minimum resolution)) of pwm signal P is that 2V or 2V are when above, flicker etc. can take place in lamp 12, thereby the state of lighting a lamp becomes unstable (dash area in the form of Fig. 6).Therefore, in this example, inverter circuit 52 is set at variation range delta VL with the corresponding modulating voltage VL of cycle minimal decomposition width of pwm signal P less than 2V (Δ VL＜2 (V)).
In addition, so-called cycle minimal decomposition width, be meant from the rising edge of the pulse of the minimum of pwm signal P along to trailing edge along till width.
Storing each one among the ROM in advance, for example performed various programs (program) such as voltage configuration part 71, preheat circuit control part 72 and dim signal generating unit 74 by DSP56.
Among the RAM, will be stored in assigned region respectively by detected various digital values such as state-detection portions 73.
And, for ignition device 42, in power supply unit 51, utilize the action of trigger 61 to generate switching pulse SP, and make the consistent power factor of improving of phase place of input voltage V0 and input current I0 so that field-effect transistor Q1 carries out switch motion.
Particularly, as Fig. 1 and shown in Figure 4, when utilizing not shown starting that field-effect transistor Q1 is connected, the electric current that increases flows among the chopper choke L1 (diode D1) linearly, the choke electric current I is flowed among the secondary coil L1b of this chopper choke L1, thereby the energy of electromagnetism savings is in chopper choke L1.Simultaneously, when utilizing the switching current IQ that produces by the connection of field-effect transistor Q1, the voltage VQ (≧ reference voltage VTH that will produce by resistance R 2) when being input in the analog comparator 63, from the reseting terminal input resetting voltage VR (=voltage VQ) of analog comparator 63 to trigger 61, and the switching pulse SP that closes is supplied to the gate terminal of field-effect transistor Q1 from the lead-out terminal of described trigger 61, thereby described field-effect transistor Q1 is connected, the electromagnetic energy that to put aside thus in chopper choke L1 discharges, and the electric current of Jian Shaoing flow among the chopper choke L1 (diode D1) linearly.
By repeating above-mentioned action, with the waveform of input voltage V0 promptly through sine (sign) waveform of full-wave rectification, just reference waveform SW forms output current I1 as envelope (envelope curve).
The output voltage V 1 that is generated by power supply unit 51 with the frequency of the regulation of for example 50kHz etc. and the duty of regulation, is connected field-effect transistor Q2, the Q3 of inverter circuit 52 and is disconnected action, is converted to high-frequency ac voltage thus.
Utilize this high-frequency ac voltage, resonant circuit 53 resonance and resonance current is flowed, and preheat curent IP is flowed among preheating each secondary coil L3b, L3c with transformer L3 of preheat circuit 55 respectively, carry out preheating with filament FLa, FLb to lamp 12, wherein said preheat circuit 55 is that the preheating according to the specified period that is generated by preheat circuit control part 72 makes field-effect transistor Q4 carry out switch motion with pwm signal PP.
And, utilize the preheating of filament FLa, FLb, come starting voltage (starting voltage) to applying regulation between filament FLa, FLb, so that lamp 12 is lit a lamp (starting), thereby make described lamp 12 stable lighting a lamp.
At this moment, in the ignition device 42, according to by among 73 detected lamp current IL of state-detection portion or the modulating voltage VL any carries out FEEDBACK CONTROL at least so that described lamp current IL, modulating voltage VL or reach the desired value of regulation as their long-pending lamp electric power.
When the lamp 12 of lighting a lamp is as described above carried out light modulation, import pwm signal P from the dim signal generating unit 74 of DSP56 to the high-side driver 65 of ignition device 42, so that the driving frequency of inverter circuit 52 can change.Increase or reduce by the driving frequency that makes inverter circuit 52, can suppress or increase High frequency power, thereby suppress or increase lamp current IL to come lamp 12 is carried out light modulation from inverter circuit 52.
In dim signal generating unit 74, according to by among 73 detected lamp current IL of state-detection portion and the modulating voltage VL at least any, generate pwm signal P with the cycle that depends on the Action clock CLK that generates by clock generating unit 76, then in described dim signal generating unit 74, according to the duty of the pwm signal P in former cycle and any in the non-duty, so that the duty ratio of the pwm signal P of following one-period is fixing mode, come the edge of the decline of pwm signal P is set, and, can make the driving frequency of described inverter circuit 52 thus to make the edge counter-rotating of the decline of pwm signal P with the independent sequential of Action clock CLK, be cycle of pwm signal P not rely on Action clock CLK and change.
The periodic Control of described pwm signal P is to carry out in each cycle, perhaps specified period with interior, for example 100 μ sec cycles carried out in interior every several cycles, reflected the state of lighting a lamp of lamp 12 in the cycle of pwm signal P immediately.
At this, inverter circuit 52 is controlled so that with the variation range delta VL of the corresponding modulating voltage VL of cycle minimal decomposition width of pwm signal P less than 2V.
And, in preheat circuit 55, utilize so that the preheating that preheat curent IP generates near the mode of desired value pwm signal PP, make field-effect transistor Q4 carry out switch motion, can optimize thus because of the kind of lamp 12 or the difference in the manufacture process etc. change light a lamp in amounts of preheat, wherein said desired value is following the mode by the 73 detected lamp current IL of state-detection portion, modulating voltage VL, lamp electric power or variations in temperature on every side etc., utilizes preheat circuit control part 72 and sets.
As previously discussed, according to the state of lighting a lamp, specified action clock CLK and dim signal etc. by state-detection portion 73 detected lamps 12, calculate the cycle of pwm signal P by dim signal generating unit 74, and, by the dim signal generating unit 74 that can generate with the non-integral multiple corresponding pwm signal of cycle of specified action clock CLK, generate the pwm signal P in the described cycle that calculates, be not subjected to the Action clock restriction thus, need not stop the cycle variation fine continuously that other processing just can make pwm signal P, thereby can carry out extremely fine brightness adjustment control.
Particularly, dim signal generating unit 74 alternately produces first edge and second edge, can between second edge, control thus the cycle of pwm signal P, and can be between first edge duty ratio of pwm signal P be set at fixed value arbitrarily, wherein said first edge corresponding to the rising of specified action clock CLK or in descending any and move, and described second edge corresponding between the rise and fall of specified action clock CLK or descend with rising between in any and export.
That is, but usage operation clock CLK is less relatively, in other words low speed and DSP56 at a low price, so the cost of ignition device 42 also is minimized.
Especially in the ignition device 42 of this example, because of having used resonant circuit 53, so trickle frequency (cycle) control becomes important, by possess can generate as mentioned above can with the dim signal generating unit 74 of corresponding pwm signal P of non-integral multiple cycle, and can carry out extremely fine brightness adjustment control.
In addition, dim signal generating unit 74 is set duty ratio thus to make second edge counter-rotating of pwm signal P with the independent sequential of Action clock CLK, thereby can easily the duty of pwm signal P be set shortlyer than Action clock CLK.
With with the sequential of the regulation of synchronous sequential of the peak phase of lamp current IL or modulating voltage VL etc., come the cycle of pwm signal P is set by dim signal generating unit 74, thus the some modulation frequency of lamp 12 is set, thereby can set the state of lighting a lamp of lamp 12 with suitable sequential, the peak phase of wherein said lamp current IL or modulating voltage VL is that the frequency data of the regulation that calculates according to any signal at least in the main circuit 58 or based on lamp current IL or modulating voltage VL etc. determine.Its result, even if lamp 12 be in extinguish and light a lamp between unsure state under, also can keep lighting a lamp of lamp 12, therefore can carry out more deep light modulation.
Dim signal generating unit 74 is made as the cycle of pwm signal P below the 20 μ sec, and according to the state of lighting a lamp of lamp 12,100 μ sec cycles with the interior cycle, particularly in each cycle the operating frequency of inverter circuit 52 is carried out FEEDBACK CONTROL, can further improve the response of inverter circuit 52 thus.
And, previous, ignition device by with the combination of the high-frequency lighting of the resonance effect that has used resonant circuit etc., and can further advance the high efficiency of discharge lamp or system, but its result can cause lamp directly to attenuate and modulating voltage increases.And, owing to use resonance effect,, output voltage, be that the variation of modulating voltage will increase therefore with respect to cycle (switch periods of switch element) of pwm signal.Therefore, when inverter circuit being carried out when digital control, output can become stepped, lights a lamp thereby be not easy to stablize, and in addition, when control cycle postpones or carries out FEEDBACK CONTROL, is not easy equally to stablize to light a lamp.
Therefore, inverter circuit 52 is so that light a lamp lamp 12 with the variation range delta VL of the corresponding modulating voltage VL of cycle minimal decomposition width of pwm signal P less than the mode of 2V, thus, even if the lamp 12 that modulating voltage VL is higher relatively, also can stably carry out light modulation, thereby energy conserving system (energy-saving system) can be provided.
According to the desired value of setting the regulation of dim signal generating unit 74 by the state of lighting a lamp of state-detection portion 73 detected lamps 12, thus inverter circuit 52 is carried out FEEDBACK CONTROL, thereby can drive inverter circuit 52 efficiently corresponding to the state of lighting a lamp of lamp 12.
Only will be located among the DSP56 integratedly with dim signal generating unit 74 according to the voltage configuration part 71 that mains voltage waveform is set reference waveform SW, and the utilization hardware different with DSP56 constitutes copped wave control part 64, compare with the situation etc. of utilizing DSP to generate the control signal of boost chopper circuit 59 thus, can reduce the processing burden of the software among the DSP56, and can not cause burden to the control of inverter circuit 52, thereby can realize the control of boost chopper circuit 59 and the control of inverter circuit 52 simultaneously, wherein said copped wave control part 64 generates switching pulse SP with switching current IQ corresponding to the mode of reference waveform SW, and described switching pulse SP is that the choke electric current according to the secondary coil L1b side of switching current IQ and chopper choke L1 comes field-effect transistor Q1 is carried out switch control.
Particularly, utilize 63 couples of reference voltage VTH of analog comparator and the voltage VQ that is produced by the switching current IQ of field-effect transistor Q1 to compare, wherein said reference voltage VTH is set according to the input voltage V0 and the output voltage V 1 of detected boost chopper circuit by voltage configuration part 71, and generate the switching pulse SP of field-effect transistor Q1 according to the choke voltage V of the secondary coil L1b side of the output voltage of described analog comparator 63 and chopper choke L1 by trigger 61, can alleviate the processing burden of the software among the DSP56 thus, and generate the switching pulse SP of field-effect transistor Q1 easily.
And, because of alleviating the processing burden of the software among the DSP56, so even if in DSP56, append the processing burden that other control also can suppress software.
The reference waveform SW of switching current IQ that makes field-effect transistor Q1 is corresponding to the output of inverter circuit 52 or corresponding to supply voltage and utilize voltage configuration part 71 and can change, even if thus under the lower situation of the output of inverter circuit 52, perhaps the situation that supply voltage is lower is inferior, also can alleviate the load of this boost chopper circuit 59 and make its action.
Judge by optimum value the amounts of preheat of filament FLa, FLb in the lighting a lamp of lamp 12, and can set the best amounts of preheat of the filament that differs greatly in the manufacture process of the kind difference of lamp or lamp, thereby eliminate excessive preheating or preheating deficiency, the short lifeization or the early stage melanism of lamp 12 can not occur.
And, utilize single DSP56 to come to carry out digital control to boost chopper circuit 59, inverter circuit 52 and preheat circuit 55 etc., the situation of special-purpose with each control is being set thus DSP etc. is compared, structure obtains simplifying, and not only make while reflecting that each other operate condition is controlled and become easy, and can be made up with for example transducer etc. and useless light is carried out light modulation, thereby can save the energy.
In addition, in the described example, separately structure of power supply unit 51 and preheat circuit 55, and their control etc. be not limited to described structure and control.
In addition, inverter circuit 52 can also constitute so that make lamp 12 startings with the variation range delta VL of the corresponding modulating voltage VL of cycle minimal decomposition width of pwm signal P less than the mode of 2V.In the case, even if the higher relatively lamp 12 of modulating voltage VL also can make it stably start.
Claims (7)
1, a kind of ignition device is characterized in that comprising:
Inverter circuit is converted to direct voltage output behind the high frequency voltage and lamp is lit a lamp;
State detection unit detects the state of lighting a lamp of lamp;
Arithmetic element, at least according to by the state of lighting a lamp and the specified action clock of the detected lamp of described state detection unit, and computing is sent as an envoy to cycle of pwm signal of inverter circuit action;
The signal generation unit constitutes the corresponding pwm signal of non-integral multiple cycle that can generate with the specified action clock, and generates the pwm signal in the cycle that is calculated by arithmetic element; And
Control unit, the pwm signal according to being generated by described signal generation unit comes inverter circuit is carried out drive controlling.
2, ignition device according to claim 1, it is characterized in that wherein said signal generation unit alternately produces first edge and second edge, described first edge is that with the rising of specified action clock and in descending any is corresponding and move, and described second edge is between the rise and fall with the specified action clock, and descend with rising between in any is corresponding and export.
3, ignition device according to claim 1, it is characterized in that wherein said inverter circuit comprises switch element, utilize the switch motion of the corresponding switch element of cycle of the pwm signal that is generated with the signal generation unit, and direct voltage is converted to high frequency voltage, so that less than the mode of 2V lamp is lit a lamp with the excursion of the cycle minimal decomposition width corresponding output voltage of pwm signal.
4, ignition device according to claim 1 is characterized in that wherein said signal generation unit according to the desired value of being set regulation by the state of lighting a lamp of the detected lamp of state detection unit, comes inverter circuit is carried out FEEDBACK CONTROL thus.
5, ignition device according to claim 4 is characterized in that wherein said signal generation unit is set at the cycle of pwm signal below 20 microseconds, and the cycle of the FEEDBACK CONTROL of inverter circuit is set at below 100 microseconds.
6, ignition device according to claim 5 is characterized in that wherein said signal generation unit is to carry out to the FEEDBACK CONTROL of inverter circuit in each cycle.
7, a kind of ligthing paraphernalia is characterized in that comprising:
Appliance body is installed with lamp; And
As the described ignition device of arbitrary claim in the claim 1 to 6, to the lamp control of lighting a lamp.
Applications Claiming Priority (9)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007-277014 | 2007-10-24 | ||
| JP2007277014 | 2007-10-24 | ||
| JP2007277012 | 2007-10-24 | ||
| JP2007277012 | 2007-10-24 | ||
| JP2007277014 | 2007-10-24 | ||
| JP2007-277012 | 2007-10-24 | ||
| JP2008145282 | 2008-06-03 | ||
| JP2008145282A JP5196146B2 (en) | 2007-10-24 | 2008-06-03 | Lighting device and lighting apparatus |
| JP2008-145282 | 2008-06-03 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101420810A true CN101420810A (en) | 2009-04-29 |
| CN101420810B CN101420810B (en) | 2012-06-13 |
Family
ID=40815581
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008101717618A Expired - Fee Related CN101420810B (en) | 2007-10-24 | 2008-10-23 | Lighting device and illumination apparatus |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP5196146B2 (en) |
| CN (1) | CN101420810B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103078549A (en) * | 2013-01-10 | 2013-05-01 | 浙江中碳科技有限公司 | Universal alternating current (AC) adapter for AC and direct current (DC) |
| CN103533703A (en) * | 2012-06-28 | 2014-01-22 | 三星电机株式会社 | Circuit and method for driving LED light |
| CN104994625A (en) * | 2011-02-07 | 2015-10-21 | 谷歌公司 | Multi-string led current control system and method |
| CN112967670A (en) * | 2021-03-03 | 2021-06-15 | 北京集创北方科技股份有限公司 | Display driving method, device and chip, display device and storage medium |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103795376B (en) * | 2014-03-03 | 2018-04-03 | 青岛力信科创电子有限公司 | A kind of wide duty ratio modulation circuit of wideband |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2901659B2 (en) * | 1989-09-20 | 1999-06-07 | 株式会社日立製作所 | Control method of power converter |
| JP3185425B2 (en) * | 1992-12-22 | 2001-07-09 | 松下電工株式会社 | Inverter device |
| JP3817958B2 (en) * | 1999-03-16 | 2006-09-06 | セイコーエプソン株式会社 | PWM control circuit, microcomputer, and electronic device |
| KR100631987B1 (en) * | 2005-06-20 | 2006-10-09 | 삼성전기주식회사 | Driving apparatus for ccfl |
| JP4797511B2 (en) * | 2005-08-23 | 2011-10-19 | 日本電気株式会社 | Cold cathode tube lighting device, tube current control method, and integrated circuit |
-
2008
- 2008-06-03 JP JP2008145282A patent/JP5196146B2/en not_active Expired - Fee Related
- 2008-10-23 CN CN2008101717618A patent/CN101420810B/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104994625A (en) * | 2011-02-07 | 2015-10-21 | 谷歌公司 | Multi-string led current control system and method |
| CN104994625B (en) * | 2011-02-07 | 2018-12-18 | 谷歌有限责任公司 | More string LED current control systems and method |
| CN103533703A (en) * | 2012-06-28 | 2014-01-22 | 三星电机株式会社 | Circuit and method for driving LED light |
| CN103078549A (en) * | 2013-01-10 | 2013-05-01 | 浙江中碳科技有限公司 | Universal alternating current (AC) adapter for AC and direct current (DC) |
| CN112967670A (en) * | 2021-03-03 | 2021-06-15 | 北京集创北方科技股份有限公司 | Display driving method, device and chip, display device and storage medium |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2009123677A (en) | 2009-06-04 |
| CN101420810B (en) | 2012-06-13 |
| JP5196146B2 (en) | 2013-05-15 |
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