CN1638588A - Discharge lamp lighting device and illuminating equipment - Google Patents
Discharge lamp lighting device and illuminating equipment Download PDFInfo
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- CN1638588A CN1638588A CN 200410031821 CN200410031821A CN1638588A CN 1638588 A CN1638588 A CN 1638588A CN 200410031821 CN200410031821 CN 200410031821 CN 200410031821 A CN200410031821 A CN 200410031821A CN 1638588 A CN1638588 A CN 1638588A
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Abstract
The invention provides a discharge lamp lighting apparatus and lighting equipment achieving lower cost by preventing the destruction the apparatus at the time of a light load, in the termination of a service life of a lamp and in the rise of a power source voltage and also by adoption a low breakdown voltage. An inverter control circuit 2 is provided with a feed back control circuit FB, and a bottom voltage smoothed by a capacitor Ca is detected by a bottom voltage detecting signal S1. Then, driving signals SH and SL with variable operating frequencies according to the trough voltage Vdc2 are outputted, and feed back control is carried out by driving switching elements Q1 and Q2 on and off in an inverter INV by the feed back control circuit FB. At this time, when the trough voltage Vdc2 is higher, control is carried out by increasing a test frequency so that the trough voltage Vdc2 is decreased. When the trough voltage Vdc2 is low, control is carried out decreasing the test frequency so that the trough voltage Vdc2 is increased.
Description
Technical field
The present invention relates to be transformed to lighting apparatus for discharge lamp and the lighting apparatus that exchanges output to the DC power supply that AC power carries out obtaining behind the rectifying and wave-filtering by making the switch element break-make.
Background technology
In the prior art, as the inverter that is used for lighting apparatus for discharge lamp, a kind of pattern that has circuit structure shown in Figure 8 is arranged, the structure of this circuit is, rectification circuit RE by diode bridge and so on carries out full-wave rectification, after by inverter circuit INV the VD of rectification circuit RE being transformed to high-frequency ac output, lamp load L such as supplied to discharge lamp, and be provided with valley amplitude limiter circuit (burying the paddy circuit) 1 at the rear-stage side of inverter circuit INV.
As carry out more specific description, then inverter circuit INV has following structure: by exporting the impedance elements Z that is connected with the side of the positive electrode of rectification circuit RE (can be capacitor, inductor, resistor any, also can be these combination of elements) series circuit of the switch element Q2 of the switch element Q1 of side of the positive electrode and negative side is connected between the dc output end of rectification circuit RE, further will be by capacitor C2, series resonant circuit that C3 and inductor L1 constitute and the series circuit of switch element Q2 are connected between the dc output end of rectification circuit RE, and lamp load L and capacitor C2 are connected in parallel.
Valley amplitude limiter circuit 1, have following structure: will be used in the valley amplitude limit commutation condenser Ca (below, abbreviate capacitor as) be connected in the series circuit that the anode-side of the diode Da of switch element Q1 and the tie point of impedance elements Z is connected by inductor La and negative electrode, be used in the valley amplitude limit commutation condenser Cb (below, abbreviate capacitor as) be connected in series circuit that the cathode side of diode Dc of the negative side output of rectification circuit RE is connected and two switch element Q1 of capacitor Cc and inverter circuit INV by inductor Lb and anode, the series circuit of Q2 is connected in parallel, and anode is connected in switch element Q1, the negative electrode of the diode Db of the tie point of Q2 is connected with the tie point of inductor La with diode Da, and negative electrode is connected in switch element Q1, the negative electrode of the diode Dd of the tie point of Q2 is connected with the tie point of inductor Lb with diode Dc.Capacitor Ca, Cb are electrolytic capacitors, have much larger than the capacitance of capacitor Cc.To each switch element Q1, Q2, suppose and adopt MOSFET (mos field effect transistor), but also can adopt the bipolar transistor that diode is connected in the inverse parallel mode.
Two switch element Q1, Q2 are under the control of unshowned in the drawings suitable control circuit, with high frequency break-make alternately.Therefore, when switch element Q2 connects, from rectification circuit RE or valley amplitude limiter circuit 1 along capacitor C3, lamp load L and the path flow of capacitor C2, inductor L1, switch element Q2 cross resonance current, and when switch element Q1 connects, make capacitor C3 emit electric charge and cross resonance current along the path flow of impedance elements Z, switch element Q1, inductor L1, lamp load L and capacitor C2, capacitor C3.
Here, in valley amplitude limiter circuit 1, when switch element Q1 connects, capacitor Ca is charged, when switch element Q2 connects, capacitor Cb is charged by inductor Lb, diode Dd by diode Db, inductor La.When lamp is normally lighted, the output of valley amplitude limiter circuit 1 is voltage Vdc (both end voltage of the series circuit of=switch element Q1, Q2), shown in Fig. 2 (a), has the waveform of identical voltage Vdc1 of peak portion of the peak portion of the commutating voltage Vre (the direct current output of rectification circuit RE) that makes waveform and alternating voltage AC and voltage and the bottom voltage Vdc2 alternate repetition that equates by the filtered voltage of capacitor Ca, Cb.That is,,, then will make the electric current supplied with to lamp load L from inverter circuit INV the little variation of large space between muscles portion of peak portion with commutating voltage Vre as in the power supply of inverter circuit INV, only having used valley amplitude limiter circuit 1 because the high paddy portion of peak portion of commutating voltage Vre is low.Secondly, as in the power supply of inverter circuit INV, only having used input from AC power AC, then the condition of resonance among the inverter circuit INV will change with the variation of commutating voltage Vre, the variation to the supplying electric current of lamp load L that causes because of the variation of commutating voltage Vre, the many modes of electric current that the few and commutating voltage Vre of the electric current of supplying with to lamp load L when will be with commutating voltage Vre high supplies with to lamp load L when low change.In other words, the changing pattern of corresponding with the variation of the commutating voltage Vre electric current of supplying with to lamp load L, can by adopt with from the valley amplitude limiter circuit 1 of the input inversion of AC power AC and with the peak reduction of current waveform, consequently, from the waveform of inverter circuit INV to the electric current of lamp load L supply, become the shape of its peak value between the peak of commutating voltage Vre portion and paddy portion, thereby the variation of load current is reduced.
Further, in valley amplitude limiter circuit 1, owing to make the charging current of filtering capacitor Ca, Cb flow through switch element Q1, Q2 respectively, so can lower the stress of switch element Q1, Q2.In addition, under the situation of switch element Q1, Q2 having been carried out FREQUENCY CONTROL, load control, because the charging current to capacitor Ca, Cb when input side is looked keeps necessarily substantially, thus the variation of load current can be reduced, but also can reduce the distortion deterioration of input current.In other words, can expand control range.In addition, when dropping into power supply (up to make inverter circuit INV action during), the switch element Q1 that impedance component and the little capacitor Cc of capacitance because of AC power AC are caused, the voltage Vdc's at Q2 two ends boosts, owing to be connected in series, so also can suppress to boosting of voltage Vdc by diode Dd, Db and capacitor Ca, Cb.
In addition, as other circuit structure, also have a kind of impedance elements Z to be replaced into diode and be connected to the form of valley amplitude limiter circuit 1 by forward from rectification circuit RE Fig. 8, in the sort circuit structure, when switch element Q2 connects in the peak of commutating voltage Vre portion in upper reaches, the path overcurrent by capacitor C3, but then do not flow through this electric current in paddy portion, thereby the condition of resonance among the inverter circuit INV is changed with the variation of commutating voltage Vre.Therefore, the supplying electric current that produces because of the variation of commutating voltage Vre to lamp load, the many modes of electric current that the few and commutating voltage Vre of the electric current of supplying with when will be with commutating voltage Vre high supplies with when low change.So, the same with the conventional example of above-mentioned Fig. 8, the changing pattern of corresponding with the variation of the commutating voltage Vre electric current of supplying with to lamp load L, can by be provided with from the valley amplitude limiter circuit 1 of the input inversion of AC power AC and the variation of the electric current that will supply with to lamp load L reduces, in addition, can also lower the stress of switch element Q1, Q2.In addition, as other circuit structure, also has a kind of form that in inverter circuit INV, has adopted half bridge circuit.(for example, with reference to patent documentation 1)
Further, Fig. 9 illustrates the circuit structure of the lighting apparatus for discharge lamp with a plurality of lamp load L, have the diode D17 that is connected with the load-side output of rectification circuit RE by negative electrode, negative electrode is connected with the anode of diode D17 and anode is connected in the diode D18 of negative side of valley amplitude limiter circuit 1 and the impedance elements Z that the capacitor C22 that is connected in parallel with diode D18 constitutes, and a plurality of load resonant circuit K that will comprise lamp load L are connected diode D17, the tie point of D18 and switch element Q1, between the tie point of Q2, each load resonant circuit K is by capacitor C2, C3, the series circuit of inductor L1 and the lamp load L formation that is connected in parallel with capacitor C2.In addition, valley amplitude limiter circuit 1 is removed inductor La, the Lb of Fig. 8, and is replaced into the inductor Lab between the tie point of the tie point that is plugged on switch element Q1, Q2 and diode Db, Dd.
In addition, in lighting apparatus, providing the pattern that above-mentioned lighting apparatus for discharge lamp has been installed.
[patent documentation 1] spy opens flat 9-260077 communique (paragraph sequence number [0017]~[0026], Fig. 1~Fig. 6)
Summary of the invention
(problem that invention will solve)
In above-mentioned existing lighting apparatus for discharge lamp, dual-purpose that input current abnormality improves circuit and to the high frequency power supply circuits of load, in the structure of Fig. 8, can according to by switch element Q1, diode Db, inductor La, and the balance of the output of the clipping circuit that constitutes of switch element Q2, diode Dd, inductor Lb and each power consumption of the inverter circuit that constitutes by switch element Q1, Q2, inductor L1, capacitor C2, block capacitor C3, impedance elements Z change state as the voltage Vdc of the output of valley amplitude limiter circuit 1.Voltage Vdc when lamp is normally lighted (with reference to Fig. 2 (a)) has the waveform that makes the waveform peak portion voltage Vdc1 identical with the peak portion of the commutating voltage Vre of alternating voltage AC and voltage and the bottom voltage Vdc2 alternate repetition that is equated by the filtered voltage of capacitor Ca, Cb.Different therewith, from start light to lamp load L during, during for the filament pre-heating that carries out the useful life that prolongs lamp and when non-loaded (lamp load L all removes), be in a ratio of underload when normally lighting, during this underload and the voltage Vdc (with reference to 2 locking wires of Fig. 2 (b)) during the lamp end of lifetime than the peak value height of commutating voltage Vre, the difference of voltage Vdc1 of peak portion and bottom voltage Vdc2 diminishes, voltage Vdc when normally lighting with lamp compares, boost to high voltage, thereby might make electronic unit (for example, the capacitor Ca that constitutes lighting apparatus for discharge lamp, Cb, switch element Q1, Q2 etc.) withstand voltage causing above feasible value damages.In addition, as adopting high pressure-proof components that cost will be improved for preventing to damage.Further, at the end of lifetime of lamp, under the state that does not discharge between the filament at lamp load L two ends, on filament, still continue to flow through preheat curent, and will proceed the boost action of voltage Vdc.
Further, at this dual-purpose input current abnormality improve in circuit and the circuit the high frequency power supply circuits of load, the mains voltage variations of AC power AC is big to the influence of voltage Vdc, in the voltage Vdc waveform when the lamp shown in Fig. 2 (a) is normally lighted, the peak portion of the commutating voltage Vre of alternating voltage AC is identical with the waveform of the voltage Vdc1 of peak portion of voltage Vdc, thereby supply voltage will directly have influence on voltage Vdc.In other words, raise as supply voltage, then voltage Vdc also raises.Therefore, when the supply voltage of AC power AC increases, might voltage Vdc further be raise.
Resonance curve Y1, Y2 when in addition, the lamp shown in Figure 10 is lighted, Y3.The supply voltage of expression AC power AC is each resonance curve under the various situations of rated value, rated value * 0.9, rated value * 0.8, when the supply voltage of AC power AC reduces significantly, as proceed to light action, then supply voltage reduce more the multi resonant curve that shakes move to high frequency side, each homophase frequency f 01 of resonance curve Y1~Y3, f02, f03, also be that supply voltage reduces to such an extent that manyly more move to high frequency side, thereby compare with the operating frequency finv of inverter circuit INV, exist the relation of f01<f02<finv<f03.In addition, being phase place zone in advance when the operating frequency finv of inverter circuit INV is lower than the homophase frequency, is the phase lag zone when being higher than the homophase frequency, so, be the action in the leading zone of phase place on resonance curve Y3, on switch element Q1, Q2, will produce excessive stress.Long as the operate time in the leading zone of phase place, then might lamp device also be damaged.
The present invention is in view of the above problems and exploitation, and its objective is provides a kind of when underload, during the lamp end of lifetime and supply voltage can prevent that locking apparatus damages when raising and because of adopting low pressure-proof components to make the lighting apparatus for discharge lamp and the lighting apparatus of cost reduction.
(solving the means of problem)
The lighting apparatus for discharge lamp of part 1 of the present invention, have the rectification circuit that AC power is carried out rectification, the inverter circuit that is connected and DC power supply is transformed to high frequency output back supply lamp load with the output of rectification circuit, this lighting apparatus for discharge lamp is characterised in that: inverter circuit, by being connected in series mutually and the 1st and the 2nd switch element of break-make alternately, be inserted between the dc output end of rectification circuit and the impedance elements between the series circuit of two switch elements, have capacitor and inductor and will and the series circuit of impedance elements be connected the resonant circuit that is used to simultaneously between the two-terminal of at least one switch element to take out to the output of lamp load and constitute, also have: the valley amplitude limiter circuit, the series circuit of the 1st and the 2nd rectifier cell is connected with the two ends of antiparallel mode with the 1st switch element, the 1st inductor and the series circuit of the 1st filtering capacitor are connected between the terminal of an opposite side of tie point on the tie point of the 1st and the 2nd rectifier cell and the 2nd switch element and the 1st switch element, the series circuit of the 3rd and the 4th rectifier cell is connected with the two ends of antiparallel mode with the 2nd switch element, the 2nd inductor and the series circuit of the 2nd filtering capacitor is connected between the terminal of an opposite side of tie point on the tie point of the 3rd and the 4th rectifier cell and the 1st switch element and the 2nd switch element; And control circuit, thereby the boosting of both end voltage of suppressing the series circuit of the 1st and the 2nd switch element according to the operating frequency that the variation by at least one the filtered voltage in the 1st and the 2nd filtering capacitor changes the 1st and the 2nd switch element.
According to the present invention, when underload, during the lamp end of lifetime and supply voltage can prevent that locking apparatus damages when raising, and because of adopting low pressure-proof components to make the cost reduction.
The lighting apparatus for discharge lamp of part 2 of the present invention, have the rectification circuit that AC power is carried out rectification, the inverter circuit that is connected and DC power supply is transformed to high frequency output back supply lamp load with the output of rectification circuit, this lighting apparatus for discharge lamp is characterised in that: inverter circuit, by being connected in series mutually and the 1st and the 2nd switch element of break-make alternately, be inserted between the dc output end of rectification circuit and the diode between the series circuit of two switch elements, have capacitor and inductor and will and the series circuit of diode be connected the resonant circuit that is used to simultaneously between the two-terminal of at least one switch element to take out to the output of lamp load and constitute, also have: the valley amplitude limiter circuit, the series circuit of the 1st and the 2nd rectifier cell is connected with the two ends of antiparallel mode with the 1st switch element, the 1st inductor and the series circuit of the 1st filtering capacitor are connected between the terminal of an opposite side of tie point on the tie point of the 1st and the 2nd rectifier cell and the 2nd switch element and the 1st switch element, the series circuit of the 3rd and the 4th rectifier cell is connected with the two ends of antiparallel mode with the 2nd switch element, the 2nd inductor and the series circuit of the 2nd filtering capacitor is connected between the terminal of an opposite side of tie point on the tie point of the 3rd and the 4th rectifier cell and the 1st switch element and the 2nd switch element; And control circuit, thereby the boosting of both end voltage of suppressing the series circuit of the 1st and the 2nd switch element according to the operating frequency that the variation by at least one the filtered voltage in the 1st and the 2nd filtering capacitor changes the 1st and the 2nd switch element.
According to the present invention, when underload, during the lamp end of lifetime and supply voltage can prevent that locking apparatus damages when raising, and because of adopting low pressure-proof components to make the cost reduction.
The lighting apparatus for discharge lamp of the present invention's the 3rd part, have the rectification circuit that AC power is carried out rectification, the inverter circuit that is connected and DC power supply is transformed to high frequency output back supply lamp load with the output of rectification circuit, this lighting apparatus for discharge lamp is characterised in that: inverter circuit, be by being connected in series mutually and the 1st and the 2nd switch element of break-make alternately, have capacitor and inductor and be connected and be used to take out the half bridge circuit that the resonant circuit to the output of lamp load constitutes between the two-terminal of at least one switch element simultaneously, also have: the valley amplitude limiter circuit, the series circuit of the 1st and the 2nd rectifier cell is connected with the two ends of antiparallel mode with the 1st switch element, the 1st inductor and the series circuit of the 1st filtering capacitor are connected between the terminal of an opposite side of tie point on the tie point of the 1st and the 2nd rectifier cell and the 2nd switch element and the 1st switch element, the series circuit of the 3rd and the 4th rectifier cell is connected with the two ends of antiparallel mode with the 2nd switch element, the 2nd inductor and the series circuit of the 2nd filtering capacitor is connected between the terminal of an opposite side of tie point on the tie point of the 3rd and the 4th rectifier cell and the 1st switch element and the 2nd switch element; And control circuit, thereby the boosting of both end voltage of suppressing the series circuit of the 1st and the 2nd switch element according to the operating frequency that the variation by at least one the filtered voltage in the 1st and the 2nd filtering capacitor changes the 1st and the 2nd switch element.
According to the present invention, when underload, during the lamp end of lifetime and supply voltage can prevent that locking apparatus damages when raising, and because of adopting low pressure-proof components to make the cost reduction.
The present invention's the 4th part, it is characterized in that: in any part of part 1 of the present invention~the 3rd part, the 3rd inductor is inserted between the tie point of series circuit of the series circuit of the 1st and the 2nd rectifier cell and the 3rd and the 4th rectifier cell, and replaces all or part of of the 1st and the 2nd inductor by the 3rd inductor.
According to the present invention, the 1st and the 2nd inductor can be replaced into 1 inductor, maybe can make each inductor miniaturization.
The present invention's the 5th part, it is characterized in that: in any part of part 1 of the present invention~the 3rd part, have device, and the device that the action of inverter circuit is stopped of the end of lifetime state that detects lamp load.
According to the present invention, can prevent that preheat curent continues to flow through the heating of the filament of being worried under the situation of filament when the end of lifetime of lamp load, thereby can avoid producing thermal stress.
The present invention's the 6th part is characterized in that: in the 5th part of the present invention, have the device that detects no-load condition, and make the device that the action of inverter circuit stops or making inverter circuit carry out the device of intermitten when detecting no-load condition.
According to the present invention, can lower the unnecessary power consumption when non-loaded.
The present invention's the 7th part is characterized in that: in any part of part 1 of the present invention~the 3rd part, have the device of protection inverter circuit when having surpassed assigned voltage by the filtered voltage of the 1st and the 2nd filtering capacitor.
According to the present invention,, can carry out protection action, in case lighting apparatus for discharge lamp damages to inverter circuit when producing because of load abnormal and unit failure when boosting unusually.
The present invention's the 8th part, it is characterized in that: in any part of part 1 of the present invention~the 3rd part, with the connection parallel with one another of a plurality of resonant circuits, and have a plurality of lamp loads that take out output from each resonant circuit, also have device, and the device that the action of inverter circuit is stopped of the end of lifetime state that detects each lamp load.
According to the present invention,, also can prevent to continue to flow through the heating of the filament of being worried under the situation of filament at preheat curent, thereby can avoid producing thermal stress even when having 1 to arrive the end of lifetime state in a plurality of lamp load.
The present invention's the 9th part, it is characterized in that: in any part of part 1 of the present invention~the 3rd part, have voltage when AC power and be reduced to the voltage that inverter circuit is moved make the device that the action of inverter circuit stops when following or make inverter circuit carry out the device of intermitten in the leading zone of phase place.
According to the present invention, the voltage that is accompanied by AC power reduces, the stress that produces in inverter circuit in the time of can avoiding inverter circuit to move in the leading zone of phase place.Be expected to improve reliability.
The lighting apparatus of the present invention's the 10th part is characterized in that: the described lighting apparatus for discharge lamp of any part that part 1 of the present invention~the 3rd part has been installed.
According to the present invention, can obtain the identical effect of any part with part 1 of the present invention~the 9th part.
As mentioned above, in the present invention, have the control circuit that carries out FEEDBACK CONTROL, thereby suppress the rising of the voltage in the inverter circuit according to the operating frequency of the change of the change in voltage in inverter circuit switch element, so, have when underload, during the lamp end of lifetime and supply voltage can prevent that locking apparatus damages when raising and because of adopting low pressure-proof components to make the effect of cost reduction.
Description of drawings
Fig. 1 is the figure of circuit structure of the lighting apparatus for discharge lamp of expression embodiment of the present invention 1.
Fig. 2 illustrates the voltage waveform of this lighting apparatus for discharge lamp, and Fig. 2 (a) is lamp waveform when normally lighting, the waveform of Fig. 2 (b) when being underload and during the lamp end of lifetime.
Fig. 3 is the figure of circuit structure of the lighting apparatus for discharge lamp of expression embodiment of the present invention 2.
Fig. 4 is the figure of circuit structure of the lighting apparatus for discharge lamp of expression embodiment of the present invention 3.
Fig. 5 is the figure of circuit structure of the lighting apparatus for discharge lamp of expression embodiment of the present invention 4.
Fig. 6 is the figure of circuit structure of the lighting apparatus for discharge lamp of expression embodiment of the present invention 5.
Fig. 7 is the figure of circuit structure of the lighting apparatus for discharge lamp of expression embodiment of the present invention 6.
Fig. 8 is the figure of the circuit structure of the existing lighting apparatus for discharge lamp of expression.
Fig. 9 is the figure of the circuit structure of the existing lighting apparatus for discharge lamp that has a plurality of loads of expression.
Figure 10 is that expression is lighting apparatus for discharge lamp and the figure of the operating frequency of the inverter circuit that different supply voltages are corresponding.
Symbol description:
1-valley amplitude limiter circuit; The 2-inverter control circuit; 3-controls power circuit; The AC-AC power; The RE-rectification circuit; The FB-feedback control circuit; The INV-inverter circuit; Q1, Q2-switch element; The L-lamp load; The Z-impedance elements; C2, C3, Ca, Cb, Cc-capacitor; L1, La, Lb-inductor; Da, Db, Dc, Dd-diode.
Embodiment
Below, embodiments of the present invention are described with reference to the accompanying drawings.
(execution mode 1)
The circuit structure of the lighting apparatus for discharge lamp of the present embodiment shown in Fig. 1 and elemental motion, roughly the same with Fig. 8 of conventional example, just in existing lighting apparatus for discharge lamp, be provided with inverter control circuit 2, from the control power circuit 3 of commutating voltage Vre to supply powers such as inverter control circuits 2, identical structure is marked with prosign and omission will be described.Inverter control circuit 2, have feedback control circuit FB, the voltage at the inductor La of input valley amplitude limiter circuit 1 and the series circuit two ends of capacitor Ca is as bottom voltage detecting signal S1, and to detect by the filtered voltage of capacitor Ca from bottom voltage detecting signal S1 be the bottom voltage Vdc2 (with reference to Fig. 2 (a), Fig. 2 (b)) of voltage Vdc.Then, feedback control circuit FB exports the drive signal SH, the SL that have changed operating frequency according to bottom voltage Vdc2 respectively, thereby carries out the FEEDBACK CONTROL that the switch element Q1, the Q2 that drive inverter circuit INV carry out on-off action.At this moment, raise (S1 is big as bottom voltage detecting signal), then change, thereby voltage Vdc is reduced by the direction that improves operating frequency and operating frequency is controlled to be bottom voltage Vdc2 to attenuating away from the homophase frequency as bottom voltage Vdc2.On the contrary, reduce (S1 is little as bottom voltage detecting signal),, thereby voltage Vdc is increased then by lowering operating frequency and make operating frequency convergence homophase frequency and bottom voltage Vdc2 is controlled to be to the direction that raises changes as bottom voltage Vdc2.
Therefore, voltage Vdc when underload and during the lamp end of lifetime in the past, shown in the voltage Vdc (2 locking wires) of Fig. 2 (b), (commutating voltage Vre) compares remarkable rising for a short time with supply voltage, still, and the voltage Vdc of present embodiment, shown in the voltage Vdc (solid line) of Fig. 2 (b), by carrying out above-mentioned FEEDBACK CONTROL by inverter control circuit 2, boosting in the time of can being suppressed at underload and during the lamp end of lifetime, thus can prevent the damage of parts.
In addition and since inverter control circuit 2 with bottom voltage detecting signal S1 as feedback signal, institute is so that further improve the inhibition effect of boosting of voltage Vdc.Its reason is, the raised portion of the voltage Vdc1 of peak portion as with underload the time and during the lamp end of lifetime and the raised portion of bottom voltage Vdc2 compare, and can clearly be seen that then the raised portion of bottom voltage Vdc2 is much bigger.
Further, by means of the boost inhibition effect of above-mentioned FEEDBACK CONTROL to voltage Vdc, can lower the voltage that applies, thereby can use low pressure-proof components, thereby can reduce the cost of lighting apparatus for discharge lamp electronic unit to the electronic unit that constitutes lighting apparatus for discharge lamp.In addition, even the mains voltage variations of the AC power AC when lamp is normally lighted can roughly be controlled to be certain value with voltage Vdc too, thereby the output of lamp load L roughly can be kept certain.
(execution mode 2)
Fig. 3 illustrates the particular circuit configurations of the lighting apparatus for discharge lamp of execution mode 1, inverter control circuit 2, and having the semibridge system drive IC is control IC 1 (L6574 that produces for ST microelectronics in the present embodiment).In addition, between AC power AC and rectification circuit RE, be connected filter circuit F, between the lead-out terminal of rectification circuit RE, connect capacitor C10, and connecting diode D10 to inverter circuit INV by forward from the side of the positive electrode output of rectification circuit RE.Impedance elements Z is made of the parallel circuits of diode D11 and capacitor C11, and diode D11 presses forward and connects from rectification circuit RE to valley amplitude limiter circuit 1.Inverter circuit INV, constitute switch element Q1, Q2 by FET, switch element Q1, between gate-to-source, connect resistance R 11, and grid is connected in the high-order side output pin P15 of control IC 1 by resistance R 10, between gate-to-drain, connect capacitor C24, switch element Q2 simultaneously, between gate-to-source, connect resistance R 13, and grid is connected in the low level side output pin P11 of control IC 1 by resistance R 12.Wherein, pin P14 is connected with the source electrode of the switch element Q1 of high-order side, and its with pin P16 between be connected bootstrap capacitor C21.
Below, structure, the action of the inverter circuit INV that adopted control IC 1 (L6574) described.At first, for lighting lamp load L, when being used to set the starting that produces starting voltage, apply constant voltage on the frequency setting pin P2 during starting of frequency, and frequency when setting starting according to the electric current of the series circuit of the resistance R 14 of frequency setting pin P2 when being connected in starting and capacitor C12 and resistance R 15 decisions and time constant.At this moment, as the frequency of the electric current that flows through when starting frequency setting pin P2 when greatly then making starting improve, and the frequency when then making starting as electric current is little lowers.In addition, set by being connected in the capacitor C22 that sets pin P1 warm-up time warm-up time, and set the frequency of oscillation that the capacitor C23 of pin P3 is arranged on inner oscillator by being connected in frequency of oscillation.And pin P13 is NC (a not connecting) pin.
The ignition frequency of frequency is set on the pin P4 and is applied constant voltage when being used to set the lighting of lamp load L, as flows through ignition frequency and set the electric current of pin P4 ignition frequency is improved, and lowers as the little ignition frequency that then makes of electric current.
Pin P5~P7, constitute each terminal of the operational amplifier that is equipped with control IC 1 inside, pin P5 is the lead-out terminal of operational amplifier, pin P6 is the reversed input terminal of operational amplifier, pin P7 is the in-phase input terminal of operational amplifier, output pin P5 is connected in pin P4 by resistance R 17 and diode D12, and diode D12 connects with the direction opposite with the output of output pin P5.Between output pin P5-input pin P6, the parallel circuits that connects resistance R 18 and capacitor C13, the series circuit of resistance R 19, R20 is connected with reversed input pin P6, and capacitor C14 and resistance R 20 are connected in parallel, homophase input pin P7 sets pin P4 with ignition frequency and is connected.Then, bottom voltage detecting signal S1 is input to the tie point of resistance R 19, R20 by resistance R 21, adjust the operational amplifier output of output pin P5 by bottom voltage detecting signal S1, and change the extraction amount that ignition frequency is set the electric current of pin P4 that flows through by diode D12, resistance R 17, thereby frequency when changing the lighting of lamp load L according to the output of the operational amplifier of output pin P5.Then, drive signal SH, the SL of operating frequency have been changed respectively according to bottom voltage Vdc2 from pin P15, P11 output.As mentioned above, thereby the operating frequency that changes inverter circuit by the FEEDBACK CONTROL that has adopted bottom voltage detecting signal S1 is controlled to be certain value with voltage Vdc, so, even when underload, during the lamp end of lifetime and during the voltage source variation in voltage of power supply AC, also can suppress the rising of voltage Vdc, thereby can prevent the damage of parts.
Below, the lamp end of lifetime testing circuit 2a of the end of lifetime that is used to detect lamp load L is described.Lamp end of lifetime testing circuit 2a, be used to detect the end of lifetime of lamp load L, this circuit comprises the resistance R 22 between the negative side output of the tie point that is connected lamp load L and inductor L1 and rectification circuit RE, the series circuit of R23, be connected resistance R 22, the connection of R23 electricity and control IC 1 stop capacitor C15 between the pin P8, the series circuit of diode D14 and Zener diode ZD1, the diode D13 that is connected in parallel by capacitor C15 and resistance R 23, the resistance R 24 and the capacitor for filter C16 that are connected in parallel by diode D14 and diode D13, the capacitor C17 and the resistance R 25 that are connected in parallel by Zener diode ZD1 and capacitor C16.The output (tie point of Zener diode ZD1 and resistance R 25) of lamp end of lifetime testing circuit 2a is connected with the pin P8 that stops of control IC 1, and when when stopping pin P8 input signal, control IC 1 stops the output of drive signal SH, SL.In addition, modulating voltage raises when the end of lifetime of lamp load L, so it is after-applied in capacitor C16 that lamp end of lifetime testing circuit 2a is transformed to direct voltage with detected modulating voltage, surpass Zener voltage preset threshold as the both end voltage of capacitor C16 by Zener diode ZD1, then detect the lamp end of lifetime, and export inversion action stop signal to the pin P8 that stops of control IC 1.Therefore, when the end of lifetime of lamp load L, inverter control circuit 2 can promptly be transferred to halted state with inverter circuit INV, thereby can avoid the thermal stress that produces because of filament heating.
Below, control power circuit 3 is described.Control power circuit 3, be used for to inverter control circuit 2 supply powers, this circuit comprises with inductor L1 and carries out the secondary coil L10 that magnetic coupling and an end are connected with the negative side output of rectification circuit RE, be connected the diode D15 between the power pins P12 of the other end of secondary coil L10 and control IC 1 and the series circuit of resistance R 26, be connected the outlet side of impedance elements Z and the resistance R 27 between the power pins P12, be connected Zener diode ZD2 between power pins P12 and GND (ground connection) the pin P10 and the parallel circuits of capacitor for filter C18, GND pin P10 is connected with the negative side output of rectification circuit RE.So, when lamp load L lights, the electric power of supplying with to power pins P12 is supplied with from two systems in the path of having passed through resistance R 26 and the path of having passed through resistance R 27, be enough to make inverter circuit INV to continue the electric power of action so can supply with to inverter control circuit 2.Specifically, with the induced voltage of the secondary coil L10 of inductor L1 by diode D15 and resistance R 26 supply power pin P12, and with the output of rectification circuit RE by resistance R 27 supply power pin P12, supply voltage is determined by Zener diode ZD2.
In contrast, when non-loaded, only by the path of a system that has passed through resistance R 27 to power pins P12 supply capability.This has passed through the electric power that resistance R 27 is supplied with, and be can be, but be not to be enough to make it to continue the electric power of action by the electric power of inverter control circuit 2 with inverter circuit INV starting, thereby intermitten that inverter circuit INV is started repeatedly.In addition, undertaken by lamp load L under the situation that above-mentioned electric power by resistance R 27 supplies with, the electric power of power pins P12 being supplied with when non-loaded is zero, so, inverter circuit INV is stopped.Like this, owing to when non-loaded, making inverter circuit INV carry out intermitten or stopping,, further can lower unnecessary power consumption so voltage Vdc is raise.
In addition, in above-mentioned control power circuit 3, when the supply voltage of AC power AC reduces, voltage Vdc is reduced, thereby the electric power of supplying with by resistance R 27 is lowered, the output to lamp load L is reduced, so the electric power of supplying with by resistance R 26 from secondary coil L10 also lowers.Therefore, when the minimum voltage that inverter circuit INV is moved when the supply voltage of AC power AC in the phase lag zone is above, control power circuit 3, supply can make the above electric power of voltage of inverter control circuit 2 actions, therefore inverter control circuit 2 makes inverter circuit INV regular event, on the contrary, when the minimum voltage that inverter circuit INV is moved when the supply voltage of AC power AC in the phase lag zone is following, control power circuit 3, the electric power that supply makes inverter control circuit 2 not continue to move, the intermitten that the action of inverter circuit INV is started repeatedly, or make it become halted state.Therefore, be accompanied by the reduction of the supply voltage of AC power AC, when inverter circuit INV moves in the leading zone of phase place, can avoid in switch element Q1, Q2, producing big stress, thereby can provide reliability higher lighting apparatus for discharge lamp.
Below, specification exception voltage detecting circuit 2b.Abnormal voltage testing circuit 2b, be used to detect the abnormal voltage of voltage Vdc, this circuit is made of resistance R 29 between the negative side output of resistance R 28, the reset pin P9 that is connected control IC 1 and rectification circuit RE between reset pin P9 that is connected control IC 1 and the bottom voltage detecting signal S1 output and the parallel circuits of capacitor C20, when to reset pin P9 input signal, control IC 1 resets the inversion action.Then, when the bottom voltage detecting signal S1 that is input to abnormal voltage testing circuit 2b (being the bottom voltage Vdc2 of voltage Vdc) surpassed specification preset threshold by control IC, control IC 1 resetted the action of inverter circuit INV and returns initial condition (lamp preheat mode).Therefore, when voltage Vdc being raise unusually, inverter circuit INV can be resetted and protect action, in case lighting apparatus for discharge lamp damages because of load abnormal and unit failure.Under the situation of not carrying out this protection action; to make the both end voltage of capacitor Ca, Cb surpass rated voltage; thereby the internal temperature that makes capacitor Ca, Cb rises internal pressure is raise; and explosion-proof valve might be washed open and send the sound that breaks, internal gas is leaked to the outside.In addition, when detecting the abnormal voltage of voltage Vdc, the action of inverter circuit INV is stopped, the pin P8 of the control IC 1 that the output of drive signal SH, SL stops to be connected to get final product as wanting.
(execution mode 3)
The execution mode of Fig. 4 has the structure that the impedance elements Z in the circuit (with reference to Fig. 1) of execution mode 1 is replaced into diode D11.In the sort circuit structure, when switch element Q2 connects in the peak of commutating voltage Vre portion in upper reaches, the path overcurrent by capacitor C3, but then do not flow through this electric current in paddy portion, thereby the condition of resonance among the inverter circuit INV is changed with the variation of commutating voltage Vre.Therefore, the supplying electric current that produces because of the variation of commutating voltage Vre to lamp load, the many modes of electric current that the few and commutating voltage Vre of the electric current of supplying with when will be with commutating voltage Vre high supplies with when low change.So, the same with the conventional example of above-mentioned Fig. 8, the changing pattern of corresponding with the variation of the commutating voltage Vre electric current of supplying with to lamp load L, can by be provided with from the valley amplitude limiter circuit 1 of the input inversion of AC power AC and the variation of the electric current that will supply with to lamp load L reduces, in addition, can also lower the stress of switch element Q1, Q2.
In addition, inverter control circuit 2, the same with execution mode 1, as bottom voltage Vdc2 rising (S1 is big as bottom voltage detecting signal), then change, thereby voltage Vdc is reduced by the direction that improves operating frequency and operating frequency is controlled to be bottom voltage Vdc2 to attenuating away from the homophase frequency.On the contrary, reduce (S1 is little as bottom voltage detecting signal),, thereby voltage Vdc is increased then by lowering operating frequency and make operating frequency convergence homophase frequency and bottom voltage Vdc2 is controlled to be to the direction that raises changes as bottom voltage Vdc2.Therefore, by carrying out above-mentioned FEEDBACK CONTROL, in the time that underload can being suppressed at and lamp end of lifetime, and the boosting during mains voltage variations of power supply AC, thereby can prevent the damage of parts by inverter control circuit 2.
(execution mode 4)
The execution mode of Fig. 5, has following structure: the series circuit of pair of switches element Q1, Q2, the series circuit of a pair of capacitor Ce, Cf, the series circuit of pair of diodes De, Df are connected between the two ends of valley amplitude limiter circuit 1, the tie point of capacitor Ce, Cf is connected with the tie point of diode De, Df, between the tie point of this tie point and switch element Q1, Q2, inserted the resonant circuit that the series circuit by inductor L1 and capacitor C2 constitutes, and lamp load L has been connected between the two ends of capacitor C2.In addition, also be connected with the series circuit of diode D1, D2 with the series circuit of antiparallel mode with switch element Q1, Q2.That is, constitute the inverter circuit INV of semibridge system.In addition, in the present embodiment, constitute impedance elements Z by diode Db, Dd, so, the same with the conventional example of above-mentioned Fig. 8, the changing pattern of corresponding with the variation of the commutating voltage Vre electric current of supplying with to lamp load L, can by be provided with from the valley amplitude limiter circuit 1 of the input inversion of AC power AC and the variation of the electric current that will supply with to lamp load L reduces, in addition, can also lower the stress of switch element Q1, Q2.
In addition, inverter control circuit 2, the same with execution mode 1, as bottom voltage Vdc2 rising (S1 is big as bottom voltage detecting signal), then change, thereby voltage Vdc is reduced by the direction that improves operating frequency and operating frequency is controlled to be bottom voltage Vdc2 to attenuating away from the homophase frequency.On the contrary, reduce (S1 is little as bottom voltage detecting signal),, thereby voltage Vdc is increased then by lowering operating frequency and make operating frequency convergence homophase frequency and bottom voltage Vdc2 is controlled to be to the direction that raises changes as bottom voltage Vdc2.Therefore, by carrying out above-mentioned FEEDBACK CONTROL, in the time that underload can being suppressed at and lamp end of lifetime, and the boosting during mains voltage variations of power supply AC, thereby can prevent the damage of parts by inverter control circuit 2.
(execution mode 5)
Valley amplitude limiter circuit 1 shown in the execution mode of Fig. 6, inductor La, the Lb of the valley amplitude limiter circuit 1 shown in the execution mode 1~4 are removed, and be replaced into inductor Lab between the tie point of the tie point that is plugged on switch element Q1, Q2 and diode Db, Dd.This inductor Lab is inserted on the charge path of capacitor for filter Ca, Cb, because only with 1 inductor, thereby help miniaturization.The valley amplitude limiter circuit 1 of Shi Yonging can be replaced into the structure shown in present embodiment in the respective embodiments described above.
In addition, in Fig. 6, between the side of the positive electrode and inverter circuit INV of the dc output end of rectification circuit RE, inserted a diode 16 that is used to stop reverse current.
(execution mode 6)
The basic circuit structure of the execution mode of Fig. 7 and action are identical with execution mode 2, but have by the series circuit of inductor L1 and capacitor C2, C3 and a plurality of load resonant circuit K of constituting with lamp load L that capacitor C2 is connected in parallel.In addition, have also that diode D17, negative electrode that the load-side output by negative electrode and rectification circuit RE is connected are connected with the anode of diode D17 and anode is connected in the impedance elements Z that the capacitor C22 that diode D18 reaches and diode D18 is connected in parallel of the negative side of valley amplitude limiter circuit 1 constitutes, further, valley amplitude limiter circuit 1, the same with execution mode 5, have the inductor Lab between the tie point of the tie point that is plugged on switch element Q1, Q2 and diode Db, Dd.
A plurality of load resonant circuit K, connection parallel with one another, end of lifetime for the lamp load L that accurately detects a plurality of load resonant circuit K, lamp end of lifetime testing circuit 2a, each load L is had by resistance R 22, R23, capacitor C15, diode D13, D14 constitutes and is used to detect the lamp voltage detection circuit 20a of modulating voltage, the output of each lamp voltage detection circuit 20a, OR by diode D14 (" or ") circuit puts on capacitor C16, surpass Zener voltage preset threshold as the both end voltage of capacitor C16 by Zener diode ZD1, then detect the lamp end of lifetime, and to the pin P8 of control IC 1 (with reference to Fig. 3) output inversion action stop signal.Therefore, can detect the rising of modulating voltage at least at the end of lifetime of any one lamp load L, inverter control circuit 2 can promptly be transferred to halted state with inverter circuit INV, thereby can avoid the thermal stress that produces because of filament heating.
In addition, so long as the lighting apparatus of any lighting apparatus for discharge lamp of execution mode 1~6 has been installed, can obtain any one identical effect with execution mode 1~6.
Claims (10)
1. a lighting apparatus for discharge lamp has AC power is carried out the rectification circuit of rectification, is connected with the output of rectification circuit and DC power supply is transformed to the inverter circuit that lamp load is supplied with in high frequency output back, it is characterized in that:
Inverter circuit, by be connected in series mutually and alternately break-make the 1st and the 2nd switch element, be inserted between the dc output end of rectification circuit and the impedance elements between the series circuit of two switch elements, have capacitor and inductor and will and the series circuit of impedance elements be connected the resonant circuit that is used to simultaneously between the two-terminal of at least one switch element to take out to the output of lamp load and constitute
Also have: the valley amplitude limiter circuit, the series circuit of the 1st and the 2nd rectifier cell is connected with the two ends of antiparallel mode with the 1st switch element, the 1st inductor and the series circuit of the 1st filtering capacitor are connected between the terminal of an opposite side of tie point on the tie point of the 1st and the 2nd rectifier cell and the 2nd switch element and the 1st switch element, the series circuit of the 3rd and the 4th rectifier cell is connected with the two ends of antiparallel mode with the 2nd switch element, the 2nd inductor and the series circuit of the 2nd filtering capacitor is connected between the terminal of an opposite side of tie point on the tie point of the 3rd and the 4th rectifier cell and the 1st switch element and the 2nd switch element;
And control circuit, thereby the boosting of both end voltage of suppressing the series circuit of the 1st and the 2nd switch element according to the operating frequency that the variation by at least one the filtered voltage in the 1st and the 2nd filtering capacitor changes the 1st and the 2nd switch element.
2. a lighting apparatus for discharge lamp has AC power is carried out the rectification circuit of rectification, is connected with the output of rectification circuit and DC power supply is transformed to the inverter circuit that lamp load is supplied with in high frequency output back, it is characterized in that:
Inverter circuit, by be connected in series mutually and alternately break-make the 1st and the 2nd switch element, be inserted between the dc output end of rectification circuit and the diode between the series circuit of two switch elements, have capacitor and inductor and will and the series circuit of diode be connected the resonant circuit that is used to simultaneously between the two-terminal of at least one switch element to take out to the output of lamp load and constitute
Also have: the valley amplitude limiter circuit, the series circuit of the 1st and the 2nd rectifier cell is connected with the two ends of antiparallel mode with the 1st switch element, the 1st inductor and the series circuit of the 1st filtering capacitor are connected between the terminal of an opposite side of tie point on the tie point of the 1st and the 2nd rectifier cell and the 2nd switch element and the 1st switch element, the series circuit of the 3rd and the 4th rectifier cell is connected with the two ends of antiparallel mode with the 2nd switch element, the 2nd inductor and the series circuit of the 2nd filtering capacitor is connected between the terminal of an opposite side of tie point on the tie point of the 3rd and the 4th rectifier cell and the 1st switch element and the 2nd switch element;
And control circuit, thereby the boosting of both end voltage of suppressing the series circuit of the 1st and the 2nd switch element according to the operating frequency that the variation by at least one the filtered voltage in the 1st and the 2nd filtering capacitor changes the 1st and the 2nd switch element.
3. a lighting apparatus for discharge lamp has AC power is carried out the rectification circuit of rectification, is connected with the output of rectification circuit and DC power supply is transformed to the inverter circuit that lamp load is supplied with in high frequency output back, it is characterized in that:
Inverter circuit, be by be connected in series mutually and alternately break-make the 1st and the 2nd switch element, have capacitor and inductor and be connected and be used to take out the half bridge circuit that the resonant circuit to the output of lamp load constitutes between the two-terminal of at least one switch element simultaneously
Also have: the valley amplitude limiter circuit, the series circuit of the 1st and the 2nd rectifier cell is connected with the two ends of antiparallel mode with the 1st switch element, the 1st inductor and the series circuit of the 1st filtering capacitor are connected between the terminal of an opposite side of tie point on the tie point of the 1st and the 2nd rectifier cell and the 2nd switch element and the 1st switch element, the series circuit of the 3rd and the 4th rectifier cell is connected with the two ends of antiparallel mode with the 2nd switch element, the 2nd inductor and the series circuit of the 2nd filtering capacitor is connected between the terminal of an opposite side of tie point on the tie point of the 3rd and the 4th rectifier cell and the 1st switch element and the 2nd switch element;
And control circuit, thereby the boosting of both end voltage of suppressing the series circuit of the 1st and the 2nd switch element according to the operating frequency that the variation by at least one the filtered voltage in the 1st and the 2nd filtering capacitor changes the 1st and the 2nd switch element.
4. according to each described lighting apparatus for discharge lamp of claim 1~3, it is characterized in that: the 3rd inductor is inserted between the tie point of series circuit of the series circuit of the tie point of the 1st and the 2nd switch element and the 1st and the 2nd rectifier cell and the 3rd and the 4th rectifier cell, and replaces all or part of of the 1st and the 2nd inductor by the 3rd inductor.
5. according to each described lighting apparatus for discharge lamp in the claim 1~3, it is characterized in that: the device, and the device that the action of inverter circuit is stopped that have the end of lifetime state that detects lamp load.
6. lighting apparatus for discharge lamp according to claim 5 is characterized in that: have the device that detects no-load condition, and make the device that the action of inverter circuit stops or making inverter circuit carry out the device of intermitten when detecting no-load condition.
7. according to each described lighting apparatus for discharge lamp in the claim 1~3, it is characterized in that: the device that has protection inverter circuit when having surpassed assigned voltage by the filtered voltage of the 1st and the 2nd filtering capacitor.
8. according to each described lighting apparatus for discharge lamp in the claim 1~3, it is characterized in that: with the connection parallel with one another of a plurality of resonant circuits, and have a plurality of lamp loads that take out output from each resonant circuit, also have device, and the device that the action of inverter circuit is stopped of the end of lifetime state that detects each lamp load.
9. according to each described lighting apparatus for discharge lamp in the claim 1~3, it is characterized in that: have voltage when AC power and be reduced to the voltage that inverter circuit is moved make the device that the action of inverter circuit stops when following or make inverter circuit carry out the device of intermitten in the leading zone of phase place.
10. a lighting apparatus is characterized in that: each described lighting apparatus for discharge lamp in the claim 1~3 has been installed.
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JP2003425097 | 2003-12-22 | ||
JP2003425097A JP2005183291A (en) | 2003-12-22 | 2003-12-22 | Discharge lamp lighting apparatus and lighting equipment |
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CN1638588A true CN1638588A (en) | 2005-07-13 |
CN100544537C CN100544537C (en) | 2009-09-23 |
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CNB2004100318218A Expired - Fee Related CN100544537C (en) | 2003-12-22 | 2004-03-30 | Lighting apparatus for discharge lamp and lighting apparatus |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101641999B (en) * | 2007-04-23 | 2013-02-06 | 欧司朗股份有限公司 | Circuit configuration for starting and operating at least one discharge lamp |
CN101682971B (en) * | 2007-05-10 | 2013-05-15 | 奥斯兰姆有限公司 | Circuit arrangement and method for the operation of at least one discharge lamp |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2007213871A (en) * | 2006-02-07 | 2007-08-23 | Mitsubishi Electric Corp | Discharge lamp lighting device |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
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CN1120798A (en) * | 1994-10-11 | 1996-04-17 | 三星电子株式会社 | Automatic illumination intensity control apparatus for a discharge lamp |
JP2003086389A (en) * | 2001-09-07 | 2003-03-20 | Denso Corp | Discharge lamp device |
JP2003257688A (en) * | 2001-12-28 | 2003-09-12 | Toshiba Lighting & Technology Corp | Discharge lamp lighting device and luminaire |
-
2003
- 2003-12-22 JP JP2003425097A patent/JP2005183291A/en active Pending
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2004
- 2004-03-30 CN CNB2004100318218A patent/CN100544537C/en not_active Expired - Fee Related
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101641999B (en) * | 2007-04-23 | 2013-02-06 | 欧司朗股份有限公司 | Circuit configuration for starting and operating at least one discharge lamp |
CN101682971B (en) * | 2007-05-10 | 2013-05-15 | 奥斯兰姆有限公司 | Circuit arrangement and method for the operation of at least one discharge lamp |
Also Published As
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CN100544537C (en) | 2009-09-23 |
JP2005183291A (en) | 2005-07-07 |
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