CN1520241A - Discharge lamp starter - Google Patents
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- CN1520241A CN1520241A CNA031493343A CN03149334A CN1520241A CN 1520241 A CN1520241 A CN 1520241A CN A031493343 A CNA031493343 A CN A031493343A CN 03149334 A CN03149334 A CN 03149334A CN 1520241 A CN1520241 A CN 1520241A
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Abstract
Provided is a discharge lamp lighting device capable of discriminating normal discharge of a discharge lamp from abnormal discharge thereof without being influenced by voltage variation of a D.C. power source. This discharge lamp lighting device is equipped with: discharge lamp load circuits L100 and L110 for lighting discharge lamps 6 and 10 by a high-frequency current from an inverter circuit for converting a D.C. current; and a protection circuit. The protection circuit is provided with: peak-to-peak voltage detection circuits P100 and P110 for detecting peak-to-peak values of end-to-end voltages of coupling capacitors 8 and 12 of the discharge lamp load circuits; a determination circuit C100 for comparing the peak-to-peak voltages detected by the detection circuits with a voltage obtained by dividing the voltage of the D.C. power source 1 to output a stop signal for stopping oscillation of the inverter circuit when the peak-to-peak voltages are smaller; and a holding circuit H100 for stopping the oscillation of the inverter circuit by the stop signal of the determination circuit.
Description
Technical field
The present invention relates to have the high-frequency current that utilizes autoexcitation formula inverter circuit to produce and make the discharge lamp starting device of protective circuit of the starting device of discharge lamp starting.
Background technology
Among the discharge lamp starting device of the vibration output starting fluorescent lamp 36 of using high frequency inverter circuit 24, the life tests circuit 39 of the tube voltage between the two ends of detecting fluorescent lamp is set; This life tests circuit is the above tube voltage of continuous detecting specified level at the appointed time, judges this fluorescent lamp to when end of lifetime output end of lifetime is judged signal, keeps the life-span decision circuitry 55 of the output state of this end of lifetime judgement signal; And judge the signal corresponding actions with the end of lifetime that this decision circuitry produces in life-span, stop the AND gate circuit 29,30 of vibration of inverter circuit and the circuit that negater circuit 31 constitutes, the life-span decision circuitry still keeps end of lifetime to judge the output state (for example patent documentation 1) of signal by the stop circuit after the vibration of inverter circuit stops.
(patent documentation 1): the spy opens (0017～0039 section, Fig. 1～6) flat 9-289095 number
The details of the life tests circuit 39 of Fig. 1 record of patent documentation 1 is shown in Figure 3.As shown in Figure 3, with the both end voltage of capacitor 49,50 with peak-to-peak detection capacitor 50 after the both end voltage dividing potential drop of discharge lamp 36 (being recited as fluorescent lamp (discharge lamp) in the patent documentation 1).(in patent documentation 1 0032 section, be recited as the voltage doubling rectifing circuit of capacitor 50), yet even increase and decrease also can appear because of the variable effect that is subjected to input supply voltage in the electric current of discharge lamp under discharge lamp normal starting state, the voltage at discharge lamp two ends is increase and decrease thereupon also.
In addition, discharge lamp enter the life-span not the both end voltage the during phase also be subjected to the variable effect of input supply voltage.On the other hand; because the normal and life-span that discharge lamp is judged in identification is identification level relative fixed for the variation of input supply voltage of the identification comparator of the life-span decision circuitry 55 of phase not, thus exist the life-span not phase protection action for the variation of the importing power supply inaccurate problem that becomes.In addition, the both end voltage of discharge lamp is under the situation of normally turning on light, the about 95V of Fast starting type discharge lamp with luminescence of 40W for example, and the high-frequency discharge lamp of 32W is 125V, different discharge lamps is all different, in addition, because the detection voltage that the life-span is obtained at peak-to-peak testing circuit during the phase discharge is also different, thereby have to according to the constant of the kind of discharge lamp change identification level, also exist the problem that the component kind that is used to make starting device increases for this reason.
Summary of the invention
The present invention proposes for the problems referred to above that solve the existing apparatus existence just, and its primary and foremost purpose is to provide a kind of DC power supply change in voltage that can not be subjected to influence, the regular picture of no misoperation ground identification discharge lamp and the discharge lamp starting device of paradoxical discharge.
In addition, the 2nd purpose of the present invention is to provide a kind of discharge lamp starting device, no matter the kind of this device discharge lamp how, all has the protective circuit of the paradoxical discharge of the discharge lamp that same circuit, same part constitute.
In addition, the 3rd purpose of the present invention is to provide a kind of discharge lamp starting device, and this installs among a plurality of discharge lamps, even take out any one.Still can guarantee to detect the detection voltage of difference when whole discharge lamp is installed poor consistent of output voltage of the peak-to-peak voltage testing circuit of the normal starting of all the other discharge lamps and unusual starting state; take out certain discharge lamp even have, still can be so that whole discharge lamp to be installed same condition carry out the protective circuit of the abnormality detection of discharge lamp.
In addition, the 4th purpose of the present invention is to provide a kind of discharge lamp starting device, the peak-to-peak voltage testing circuit of the influence of the action that acts on discharge lamp load circuits of can ignoring when this device has actual use.
The discharge lamp starting device that the present invention relates to is made of following each several part: DC power supply; By having the DC converting that this DC power supply is provided is the inverter circuit that the half-bridge circuit of two switch elements of high-frequency current constitutes; Have choke, and reach the diode that is connected with the positive and negative polarities of above-mentioned DC power supply by this coupling capacitor through the coupling capacitor that discharge lamp is connected with this choke; The high-frequency current that utilizes above-mentioned inverter circuit to produce makes the discharge lamp load circuits of above-mentioned discharge lamp starting; The protective circuit that above-mentioned inverter is stopped according to the voltage of above-mentioned discharge lamp.Have among the discharge lamp starting device of above-mentioned formation, above-mentioned protective circuit has following formation: the peak-to-peak voltage testing circuit of the both end voltage of the coupling capacitor of the above-mentioned discharge lamp load circuits of peak-to-peak detection; Relatively the above-mentioned peak-to-peak voltage that detects with this peak-to-peak voltage testing circuit and with the voltage after partial voltage of above-mentioned DC power supply when above-mentioned peak-to-peak voltage hang down, is exported the decision circuit of the stop signal that makes the above-mentioned inverter circuit failure of oscillations; The holding circuit that when utilizing the above-mentioned stop signal of this decision circuit to make the above-mentioned inverter circuit failure of oscillations this state is kept.
Description of drawings
Fig. 1 is the circuit diagram that the discharge lamp starting device of expression embodiments of the present invention 1 constitutes.
The circuit diagram of the DC power supply that Fig. 2 is embodiments of the present invention 1 discharge lamp starting device when source power supply is obtained DC power supply.
Fig. 3 is the oscillogram of the discharge lamp starting device action of explanation embodiments of the present invention 1.
Fig. 4 is the oscillogram of the discharge lamp starting device action of explanation embodiments of the present invention 1.
Fig. 5 is the circuit diagram that the discharge lamp starting device of expression embodiments of the present invention 2 constitutes.
Embodiment
(execution mode 1)
Fig. 1 is the circuit diagram that the discharge lamp starting device of expression embodiments of the present invention constitutes, and Fig. 2 is the circuit diagram of the DC power supply when source power supply is obtained DC power supply, and Fig. 3, the 4th illustrate the performance plot that discharge lamp starting device moves.Among Fig. 1, obtain DC power supply 1 from source power supply, inverter circuit is made of the switch element that MOSFET2,3 constitutes.Discharge lamp load circuits L100 is by constituting with the lower part: choke 5, the coupling capacitor 8 that links to each other with this choke 5 through discharge lamp 6, link to each other with the negative pole of DC power supply 1 with the capacitor 7 and the anode of discharge lamp 6 parallel connections, negative electrode links to each other the diode 22 that anode links to each other with the negative electrode of diode 21 with diode 21, negative electrode that the contact of discharge lamp 6 and capacitor 8 links to each other with the positive pole of DC power supply 1.
The formation of discharge lamp load circuits L110 is identical with discharge lamp load circuits L100, be the discharge lamp load circuits in parallel with discharge lamp load circuits L100, by constituting: choke 9, the coupling capacitor 12 that links to each other with this choke 9 through discharge lamp 6, link to each other with the negative pole of DC power supply 1 with the capacitor 11 and the anode of discharge lamp 10 parallel connections with the lower part, negative electrode links to each other the diode 24 that anode links to each other with the negative electrode of diode 23 with diode 23, negative electrode that the contact of discharge lamp 10 and coupling capacitor 12 links to each other with the positive pole of DC power supply 1.
Among the choke 5 of discharge lamp load circuits L100, be provided with two secondary coil 5a, 5b, among each choke 9 of discharge lamp load circuits L110, be provided with two secondary coil 9a, 9b, secondary coil 5a, 9a between resistance 14,16 is connected the gate-source of switch element 3 (among the figure with chain-dotted line and be shown in dotted line the primary coil of choke 5,9 and the combination of secondary coil.), secondary coil 5a, 9a be with the polarity of arrow shown in scheming, and secondary wire coil 5b, 9b are with the polarity of arrow shown in scheming alternately ON/OFF driving switch element 2 and switch element 3 respectively.
Be installed in parallel switch element 2, and 3 drain-source between inner etc. put diode and then omitted its diagram.In addition, the starting circuit that is used for the starter inverter circuit has also been omitted its diagram.
Peak-to-peak voltage testing circuit (below the be referred to as the PP testing circuit) P100 of peak-to-peak voltage of both end voltage of secondary coil 5b that detects coupling capacitor 8 is by constituting with the lower part: the time in parallel with coupling capacitor 8, series capacitors 31,32, anode links to each other with the negative pole of DC power supply, the diode 33 that negative electrode links to each other with the contact of capacitor 31 and capacitor 32, the diode 34 that anode links to each other with the negative electrode of diode 33, and be connected capacitor 35 between the negative pole of the negative electrode of diode 34 and DC power supply 1, with capacitor 35 parallel resistor 36, and negative electrode is connected the diode 37 that anode is connected with reverse input end of the comparator 55 of decision circuit C100 described later with resistance 36.This PP testing circuit P100 is with the peak-to-peak voltage of the both end voltage of the inverse ratio detection coupling capacitor 8 of the capability value of capacitor 31 and capacitor 32, and its output voltage can be obtained by capacitor 35.
PP testing circuit P110 is made of following each several part: the time in parallel with coupling capacitor 12, and series capacitors 41,42; Anode links to each other with the negative pole of DC power supply 1, the diode 43 that negative electrode links to each other with the contact of capacitor 41 and capacitor 42; The diode 44 that anode links to each other with the negative electrode of diode 43; And be connected capacitor 45 between the negative pole of the negative electrode of diode 44 and DC power supply 1; With capacitor 45 parallel resistor 46; Negative electrode links to each other with resistance 46, the diode 47 that anode links to each other with reverse input end of the comparator 55 of decision circuit C100 described later.
This PP testing circuit P110 is with the peak-to-peak voltage of the both end voltage of the inverse ratio detection coupling capacitor 12 of the capability value of capacitor 41 and capacitor 42, and its output voltage can be obtained by capacitor 45.
When decision circuit C100 and DC power supply 1 were in parallel, the resistance 51,52 of series connection was in parallel with DC power supply 1, and the resistance 53,54 of series connection is also in parallel with DC power supply 1.Non-inverting input of comparator 55 links to each other with the contact of resistance 51,52, and reverse input end links to each other with the contact of resistance 53,54.
The peak-to-peak voltage that decision circuit C100 relatively detects with PP testing circuit P100, P110 and with the voltage after partial voltage of DC power supply 1, when peak-to-peak voltage was low, output made the stop signal of the inverter circuit failure of oscillations.
Holding circuit H100 is made of following each several part: grid links to each other with the lead-out terminal of decision circuit C100, the thyratron 61 that negative electrode links to each other with the negative pole of power supply 1; Negative electrode links to each other with the anode of thyratron 61, the diode 62 that anode links to each other with the grid of switch element 3; And the resistance 63 that is connected the positive interpolar of the anode of thyratron 61 and DC power supply 1.When holding circuit H100 utilizes the stop signal of decision circuit C100 to make the inverter circuit failure of oscillations, this halted state is kept.
And PP testing circuit P100, P110, decision circuit C100 and holding circuit H100 constitute protective circuit jointly.
In addition, the circuit of the DC power supply 1 when obtaining DC power supply by source power supply 1a constitutes, as shown in Figure 2, adopt following formation: from the AC power of source power supply 1a output, after diode bridge 1b full-wave rectification, by smoothing capacitor 1c smoothing, offer load circuit as DC power supply.
Utilize Fig. 1, Fig. 3, Fig. 4 to introduce the action of the discharge lamp starting device of embodiments of the present invention 1 below.
The voltage waveform of coupling capacitor C8 when Fig. 3 (a) is discharge lamp 6 regular pictures, the voltage waveform of the coupling capacitor C12 when Fig. 3 (b) is discharge lamp 10 regular pictures.Situation when Fig. 4 represents discharge lamp 10 regular pictures, discharge lamp 6 paradoxical discharges, Fig. 4 (a) is link to each other with choke 5 voltage waveform of the discharging substance of filament of the end coupling capacitor C8 when consuming of discharge lamp 6, Fig. 4 (c) is link to each other with the coupling capacitor C8 voltage waveform of the discharging substance of filament of the end coupling capacitor C8 when consuming of discharge lamp 6, the voltage waveform of the coupling capacitor C12 when Fig. 4 (b) is discharge lamp 10 regular pictures.
Among Fig. 1, one drops into DC power supply,, starts until discharge lamp 6,10 with high frequency driven MOSFET2,3 by abridged drive circuit among the figure.At this moment, can set the voltage of coupling capacitor 8,12,, form the waveform shown in Fig. 3 (a) and (b) so that when discharge lamp 6,10 normal startings by the constant of suitably selected discharge lamp load circuits L100, L110.That is to say, be set among coupling capacitor 8,12, stream has the electric current of discharge lamp 6,10 and flows through the difference resultant current of the electric current of capacitor 7,11 in parallel with it, formation is the balancing waveform at center with 1/2 of the voltage V1 of the positive pole of DC power supply 1, but just because of this resultant current, in the half period of discharge, result from the positive pole of the voltage ratio DC power supply 1 in the coupling capacitor 8,12 voltage V1 height, turn back among the DC power supply 1 by each diode 21,22,23,24 than the low part of the voltage V0 of negative pole.
In addition, shown in following formula (1), (2), (3), the voltage of reverse input end of the comparator 55 that will obtain with the dividing potential drop of the resistance 53,54 of decision circuit C100 is chosen to be the voltage of non-inverting input of obtaining greater than the dividing potential drop with resistance 51,52.
V55 (non-return)=V1 * R52/ (R52+R51) (1)
V55 (oppositely)=V1 * R54/ (R53+R54) (2)
V55 (non-return)＜V55 (oppositely) (3)
Wherein, V1: the voltage of the positive pole of DC power supply 1,
V55 (non-return): the sub-voltage of the non-inverting input of comparator 55
V55 (oppositely): the sub-voltage of the reverse input end of comparator 55
But, when only limiting to diode 37,47 for reverse bias,
R51, R52: the resistance value of resistance 51,52,
R53, R54: the resistance value of resistance 53,54,
If by above-mentioned setting, the magnitude relationship of reverse input end of the comparator 55 of decision circuit C100 and the voltage of non-inverting input is: even the voltage V1 of direct voltage 1 changes, also can be with usual the same, comparator is output as low level, and the thyratron 61 of holding circuit H100 becomes OFF.
In addition, during with regular picture, the voltage of obtaining in the capacitor 35,45 of testing circuit P100, P110 is set at formula (4) (5), (6) and the formula (7) below satisfying.And in following formula, the forward drop-out voltage of diode 33,34,37,43,44,47 can be regarded as zero, not with consideration.
V35＝V1×C31/(C31+C32) (4)
V45＝V1×C41/(C41+C42) (5)
V55 (oppositely)＜V35 (6)
V55 (oppositely)＜V45 (7)
Wherein, V35: the voltage of the capacitor 35 during for discharge lamp 6 regular pictures, promptly as shown in Fig. 3 (a), with voltage V1 capacitor 31,32 voltage after partial of DC power supply 1.
V45: the voltage of the capacitor 45 during for discharge lamp 10 regular pictures, promptly as shown in Fig. 3 (b), with voltage V1 capacitor 41,42 voltage after partial of DC power supply 1.
Under the state that satisfies above-mentioned formula (1)～(7), because it is irrelevant with the variation of DC power supply 1, diode 37 and 47 its cathode voltages are in the reverse bias state that is higher than anode voltage for a long time, so the output voltage of PP testing circuit P100, P110 does not constitute influence to the voltage of reverse input end of the comparator 55 of decision circuit C100.
At this, if because of the reasons such as consumption of discharging substance of the filament of the end that links to each other with the choke 5 of discharge lamp 6 reach phase not in life-span, the discharging current of the half period of the THE FILAMENT DISCHARGE AND of phase is not littler than the half period of normal THE FILAMENT DISCHARGE AND owing to arrive the life-span, thereby the voltage of coupling capacitor 8 becomes the voltage waveform shown in Fig. 4 (a).The voltage of obtaining when becoming than normal starting with the voltage of being obtained by capacitor 35 behind the peak-to-peak voltage of the coupling capacitor 8 shown in PP testing circuit P100 detection Fig. 4 (a) is low, because diode 37 becomes forward bias voltage drop, the voltage of reverse input end of the comparator 55 of decision circuit C100 is descended, the voltage of non-inverting input one side uprises, thereby the output of comparator 55 becomes high level, and the thyratron 61 of holding circuit H100 becomes connection.
Because thyratron 61 1 is connected, flow into the electric current of the grid of switch element 3 through resistance 13,15 separately by secondary coil 5b, the 9b of choke 5,9, promptly through diode 62, thyratron 61 bypass, thereby switch element 3 becomes and closes, and the vibration of inverter circuit stops.
Because vibration one stops, holding current continues to flow into thyratron 61 through resistance 63, keeps this state before dropping into again always after cutting off DC power supply 1, thereby can prevent discharge lamp 6 continuous running under the paradoxical discharge state.
And, though above only introduced with discharge lamp 6 link to each other with choke 5 end the improper situation of filament, yet shown in Fig. 4 (c), when the filament of the end that links to each other with coupling capacitor is undesired, also can with above-mentioned identical effect, stop the action of inverter circuit when keeping discharge lamp 6 paradoxical discharges.
In addition, when discharge lamp 10 improper discharges, and discharge lamp 6,10 obviously can prevent continuous running under the paradoxical discharge state when all discharging very much equally.
In addition, as above-mentioned formula (1), (2), (3), and formula (7) shown in, discharge lamp 6,10 all just often, because the input voltage of the comparator 55 of decision circuit C100 and the voltage V1 of DC power supply 1 are proportional, even voltage V1 changes, the input voltage of comparator 55 also can change with same variation ratio, thereby is not subjected to the influence of the change in voltage of DC power supply 1.In addition; the detection voltage of PP testing circuit P100, P110 when a certain side in the discharge lamp 6,10 is unusual is as shown in Fig. 4 (a), (c) and above-mentioned formula (4), the formula (5); irrelevant with the variation of the voltage V1 of DC power supply 1; owing to be lower than all just often detection voltage of discharge lamp 6,10 certainly; and because the sub-voltage of non-inverting input of the comparator 55 of decision circuit C100 is higher than the sub-voltage of reverse input end; thereby can make output voltage become high level; inverter circuit keeps the failure of oscillations, can play a protective role.
In addition; irrelevant with the kind of discharge lamp; discharging current during the THE FILAMENT DISCHARGE AND material consumption of discharge lamp is than filament discharging current just often hour; because the detection voltage when comparing paradoxical discharge during with regular picture is low certainly; the circuit of PP testing circuit P100, P110, decision circuit C100, holding circuit H100 constitutes and adopts same circuit to constitute, thereby applicable to life-span of multiple discharge lamp protective circuit of the paradoxical discharge the during phase not.
In addition, because switch element 2,3 needs with the choke 5,9 that constitutes each discharge lamp load circuits L100, L110 secondary coil 5a, 5b separately, the in parallel driving of output voltage of 9a, 9b, and discharge lamp load circuits L100, L110 that PP testing circuit P100, P110 are independent of separately be provided with, thereby take out certain discharge lamp and also can identical condition detect abnormal conditions with whole installation the time.
As mentioned above,, the influence of the change in voltage of DC power supply be can not be subjected to, the regular picture of carrying out discharge lamp and the identification of paradoxical discharge stablized to no misoperation according to embodiments of the present invention 1.
In addition, no matter the kind of discharge lamp how, all available same circuit constitutes, and constitutes protective circuit at the paradoxical discharge of discharge lamp with a kind of part.
In addition, can be set in a plurality of discharge lamps, even take out certain fluorescent tube, detect the detection voltage of difference when whole discharge lamp is installed poor consistent of output voltage of the peak-to-peak voltage testing circuit of the normal starting of all the other discharge lamps and unusual starting state, even thereby take out certain discharge lamp, also can identical condition detect the unusual of discharge lamp so that whole fluorescent tube to be installed.
Though and only introduced situation when discharge lamp load circuits is two-way in the present embodiment, also can be more than 1 the road or 3 the tunnel.
(execution mode 2)
Fig. 5 is the circuit diagram that the discharge lamp starting device of expression embodiments of the present invention 2 constitutes.Adopt identical label and omit its explanation with the circuit of Fig. 1 of execution mode 1 and the element that plays same function among the figure.Among PP testing circuit P100, the resistance 71,72 of series connection is in parallel with coupling capacitor 8.Be connected the capacitor 31 of the contact of coupling capacitor 8 and discharge lamp 6 in the execution mode 1, in present embodiment 2, be connected on the contact of resistance 71,72.
Among PP testing circuit P110, the resistance 73,74 of series connection is in parallel with coupling capacitor 12.The capacitor 41 that links to each other with the contact of coupling capacitor 12 and discharge lamp 10 in execution mode 1, the contact with resistance 73,74 in present embodiment 2 is connected.Formation outside above-mentioned is identical with Fig. 1.
Introduce the action of the discharge lamp starting device of embodiments of the present invention 2 below according to Fig. 5.
The action of decision circuit C100, holding circuit H100 is identical with execution mode 1, among decision circuit C100, be set at and satisfy (1) shown in the execution mode 1, (2), (3) formula, the height relation of the voltage of the reverse input end of the comparator 55 of decision circuit C100 and non-inverting input during normal starting, even changing, the voltage V1 of DC power supply 1 also remains unchanged, the output of comparator still is low level, and the thyratron 61 of holding circuit H100 still is a closed condition.
One drops into DC power supply 1 among the figure, and the abridged drive circuit is with high frequency driven MOSFET2,3, until discharge lamp 6,10 startings in promptly passing through to illustrate.If discharge lamp 6,10 regular pictures this moment, then the detection voltage of PP testing circuit P100, P110 is shown in following formula (8), (9).
V35＝V1×(C31/(C31+C32))×(R72×/(R71+R72))
(8)
V45＝V1×(C41/(C41+C42))×(R74×/(R73+R74))
(9)
Wherein, V35: the voltage of the capacitor 35 during discharge lamp 6 regular pictures.
V45: the voltage of the capacitor 45 during discharge lamp 10 regular pictures.
R71, R72, R73, R74: the resistance value of resistance 71,72,73,74.
In addition, can preestablish the relation of the sub-voltage of reverse input end of V35, V45 and decision circuit C100 so that satisfy formula (6), (7) of execution mode 1.
If more once formula (4), (5) of above-mentioned formula (8), (9) and execution mode 1, the detection voltage that just can find out PP testing circuit P100, the P110 shown in formula (8), (9) immediately is to multiply by on the detection voltage shown in formula (4), (5) than 1 little coefficient, certainly do not mentionlet alone during discharge lamp 6,10 normal startings, even a certain side in the discharge lamp 6,10 occurs unusual, also can play the effect identical with execution mode 1.
Furthermore, though among execution mode 1, the series circuit of the capacitor 31,32 of PP testing circuit P100 is in parallel with coupling capacitor 8, if the capability value that changes capacitor 31,32 promptly influences the action of discharge lamp load circuits L100, and among present embodiment 2, because capacitor 31,32 is connected with coupling capacitor 8 through resistance 71, thereby thereby can reduce the capacitance change of capacitor 31,32 time influence of coupling capacitor 8 can enlarge the range of choice of capacitor 31,32.
In addition, among the operating frequency of inverter circuit,, can ignore influence in actual the use to the coupling capacitor 8 of capacitor 31,32 if select the resistance 71 enough bigger than resistance with the impedance phase of capacitor 8.
In addition, the effect of the resistance among the PP testing circuit P110 73,74 is identical with resistance 71,72 among the PP testing circuit P100.
And among above-mentioned formula (8), wanting not the voltage of divider resistance 72 carries out PP and detects, and can realize as long as remove capacitor 32.Identical therewith, among above-mentioned formula (9), want not the voltage of divider resistance 74 and carry out PP and detect, can realize as long as remove capacitor 42.
According to the detection voltage of above-mentioned PP testing circuit P100, P110, when discharge lamp 6,10 normal startings and a certain side in the discharge lamp 6,10 have the effect identical when starting unusually with execution mode 1.
That is to say, when discharge lamp 6,10 normal startings, if satisfy above-mentioned formula (1)～formula (3), formula (6)～formula (9), then the height of the voltage of the reverse input end of the comparator 55 of decision circuit C100 and non-inverting input closes and is: even the voltage V1 of DC power supply 1 changes, also can remain unchanged always, the output of comparator still is low level, and the thyratron 61 of holding circuit H100 becomes closes (OFF), and inverter circuit continues vibration.
In addition, when a certain side's appearance in the discharge lamp 6,10 is unusual, the detection voltage of PP testing circuit P100 or P110 becomes the voltage when being lower than normal starting, the voltage of reverse input end of the comparator 55 of decision circuit C100 is descended, the output of comparator 55 becomes high level, the thyratron 61 of holding circuit H100 becomes connection (ON), and switch element 3 becomes closes, and the vibration of inverter circuit promptly stops.
As above-mentioned, present embodiment also can be ignored the influence for the action of the discharge lamp load circuits of PP testing circuit P100, P110 in actual use except that having the effect shown in the execution mode 1.
As above-mentioned, according to the present invention, the discharge lamp starting device that the present invention relates to is made of following each several part: DC power supply; The direct current that this DC power supply is provided becomes high-frequency current, the inverter circuit that is made of the half-bridge circuit with two switch elements; Choke and the coupling capacitor that is connected with this choke through above-mentioned discharge lamp and by this coupling capacitor and the diode that the both positive and negative polarity of above-mentioned DC power supply is connected, the discharge lamp load circuits of utilizing the high-frequency current of above-mentioned inverter circuit generation that above-mentioned discharge lamp is started; The protective circuit that above-mentioned inverter is stopped according to the voltage of above-mentioned discharge lamp.Have among the discharge lamp starting device of above-mentioned formation, above-mentioned protective circuit has following formation: the peak-to-peak voltage testing circuit of the coupling capacitor both end voltage of the above-mentioned discharge lamp load circuits of peak-to-peak detection; The above-mentioned peak-to-peak voltage that detects with this peak-to-peak voltage testing circuit and relatively with the voltage after partial voltage of above-mentioned DC power supply, when above-mentioned peak-to-peak voltage was low, output made the decision circuit of the stop signal of the above-mentioned inverter circuit failure of oscillations; Utilize the above-mentioned stop signal of this decision circuit, when making the above-mentioned inverter circuit failure of oscillations, the holding circuit that this halted state is kept.Just because of this, not influenced by the change in voltage of DC power supply, stablize to no misoperation the regular picture of carrying out discharge lamp and the identification of paradoxical discharge.
In addition, no matter which kind of class discharge lamp is, all available same circuit structure, same part constitute protective circuit.
Even can in a plurality of discharge lamps, take out certain fluorescent tube in addition, the detection voltage of the difference of the output voltage of the peak-to-peak voltage testing circuit of the normal starting of peak-to-peak all the other discharge lamps of detection and unusual starting state when whole discharge lamp is installed poor consistent, even thereby take out certain discharge lamp still can be when whole fluorescent tube be installed the abnormal conditions of identical condition detection discharge lamp.
(number in the figure)
1, power supply, 2,3, switch element, 5,9, choke, 6,10, discharge lamp, 8,12, coupling capacitor, 21,22,23,24, diode, 31,32,35, capacitor, 33,34,37, diode, 36,46, resistance, 41,42,45, capacitor, 43,44,47, diode, 51,52,53,54, resistance, 55, comparator, 61, thyratron, 62, diode, 63, resistance, 71,72,73,74, resistance, L100, L110, discharge lamp load circuits, P100, P110, the PP testing circuit, C100, decision circuit, H100, holding circuit.
Claims (2)
1, a kind of discharge lamp starting device comprises: DC power supply; The direct current that this DC power supply is provided is transformed to the inverter circuit that the half-bridge circuit by having two switch elements of high-frequency current constitutes; Have choke, and coupling capacitor that is connected with this choke through discharge lamp and the diode that is connected with the positive and negative polarities of above-mentioned DC power supply from this coupling capacitor; The high-frequency current that utilizes above-mentioned inverter circuit to produce, the discharge lamp load circuits that above-mentioned discharge lamp is started; And according to the voltage of above-mentioned discharge lamp, the protective circuit that above-mentioned inverter is stopped to is characterized in that: above-mentioned protective circuit comprises: the peak-to-peak voltage testing circuit of the coupling capacitor both end voltage of the above-mentioned discharge lamp load circuits of peak-to-peak detection; Relatively with the above-mentioned peak-to-peak voltage of this peak-to-peak voltage testing circuit detection with above-mentioned direct voltage voltage after partial, when above-mentioned peak-to-peak voltage was low, output made the decision circuit of the stop signal of the above-mentioned inverter circuit failure of oscillations; When utilizing the above-mentioned stop signal of this decision circuit to make the above-mentioned inverter failure of oscillations, the holding circuit that this state is kept.
2, a kind of discharge lamp starting device comprises: DC power supply; The direct current that this DC power supply is provided is transformed to high-frequency current, the inverter circuit that is made of the half-bridge circuit with two switch elements; Has choke, coupling capacitor that is connected with this choke through discharge lamp and the diode that links to each other with above-mentioned DC power supply positive and negative polarities from this coupling capacitor; The high-frequency current that utilizes above-mentioned inverter circuit to produce makes the discharge lamp load circuits of above-mentioned discharge lamp starting; And according to the voltage of above-mentioned discharge lamp, the protective circuit that above-mentioned inverter is stopped, it is characterized in that: above-mentioned protective circuit disposes with the both end voltage dividing potential drop of resistance with the coupling capacitor of above-mentioned discharge lamp load circuits, the peak-to-peak voltage testing circuit of the branch pressure voltage of the above-mentioned resistance of peak-to-peak detection; The above-mentioned peak-to-peak voltage that detects with this peak-to-peak voltage testing circuit and relatively with the voltage after partial voltage of above-mentioned DC power supply, when above-mentioned peak-to-peak voltage was low, output made the decision circuit of the stop signal of the above-mentioned inverter circuit failure of oscillations; When utilizing the above-mentioned stop signal of this decision circuit to make the above-mentioned inverter circuit failure of oscillations, the holding circuit that this halted state is kept.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP031413/2003 | 2003-02-07 | ||
| JP2003031413A JP4085264B2 (en) | 2003-02-07 | 2003-02-07 | Discharge lamp lighting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1520241A true CN1520241A (en) | 2004-08-11 |
| CN100403860C CN100403860C (en) | 2008-07-16 |
Family
ID=32958015
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031493343A Expired - Fee Related CN100403860C (en) | 2003-02-07 | 2003-06-27 | Discharge lamp starter |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP4085264B2 (en) |
| CN (1) | CN100403860C (en) |
| TW (1) | TW595267B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004068914A1 (en) | 2003-01-29 | 2004-08-12 | Sanken Electric Co., Ltd. | Discharge tube operation device |
| KR100728437B1 (en) | 2006-07-12 | 2007-06-13 | 엘지이노텍 주식회사 | Circuit for protecting inverter of driving lamps |
| TWI407836B (en) * | 2008-08-01 | 2013-09-01 | Ampower Technology Co Ltd | Protection circuit and lamp driving device employing the same |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19548506A1 (en) * | 1995-12-22 | 1997-06-26 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Circuit arrangement for operating a lamp |
| US5838114A (en) * | 1996-03-08 | 1998-11-17 | Fusion Systems Corporation | Plural ferro-resonant power supplies for powering a magnetron where the aray lies in these power supplies being independent from each other and not utilizing any common components |
| JPH103994A (en) * | 1996-06-14 | 1998-01-06 | Matsushita Electric Works Ltd | Discharge lamp lighting device |
| JP3532760B2 (en) * | 1998-04-01 | 2004-05-31 | 松下電器産業株式会社 | Discharge lamp lighting device |
| JP2000012266A (en) * | 1998-06-29 | 2000-01-14 | Mitsubishi Electric Corp | Discharge lamp lighting device |
| JP2001093690A (en) * | 1999-09-27 | 2001-04-06 | Matsushita Electric Works Ltd | Discharge lamp lighting apparatus |
-
2003
- 2003-02-07 JP JP2003031413A patent/JP4085264B2/en not_active Expired - Fee Related
- 2003-05-15 TW TW92113175A patent/TW595267B/en not_active IP Right Cessation
- 2003-06-27 CN CNB031493343A patent/CN100403860C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| TW595267B (en) | 2004-06-21 |
| JP2004241321A (en) | 2004-08-26 |
| CN100403860C (en) | 2008-07-16 |
| JP4085264B2 (en) | 2008-05-14 |
| TW200415959A (en) | 2004-08-16 |
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