CN1320845C - Discharge tube ignitor - Google Patents
Discharge tube ignitor Download PDFInfo
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- CN1320845C CN1320845C CNB02147155XA CN02147155A CN1320845C CN 1320845 C CN1320845 C CN 1320845C CN B02147155X A CNB02147155X A CN B02147155XA CN 02147155 A CN02147155 A CN 02147155A CN 1320845 C CN1320845 C CN 1320845C
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Abstract
Provided is a discharge lamp lighting device in which the discharge lamp, which is not normally lighted even if the power supply is continuously inputted after the oscillation of the switching element is stopped and retained due to end-of-life of the discharge lamp, can be relighted automatically if it is substituted by a normal discharge lamp. The lighting device comprises an inverter circuit which has a pair of switching elements 2, 3 for converting the DC from the DC power supply 1 into a high frequency current, discharge lamp load circuits L100, L110 composed of a serial circuit of choke coils 5, 9, discharge lamps 6, 10, and a capacitor 12, a protection circuit H100 which detects abnormal discharge state of the discharge lamps 6, 10 and stops and retains the oscillation of the inverter circuit, and reset circuits R100, R110 which release stop retainment.
Description
Technical field
The present invention relates to have the discharge tube igniter of reset circuit of protective circuit that the high frequency power of using from the autonomous convertor circuit makes the discharge tube igniter of discharge tube igniting.
Background technology
Fig. 5 represents the circuit diagram of existing discharge tube arrangement, in Fig. 5, the 1st, the DC power supply that obtains from source power supply, 2 and 3 switch elements of forming by the MOSFET that constitutes converter circuit, the 230th, with the resistance that switch element 2 is connected in parallel, L100 is the discharge tube load circuit, by choke 5, discharge tube 6, the electric capacity 7 and the coupling capacitance 8 that are connected in parallel with discharge tube 6 constitute.L110 has the identical formation with discharge tube load circuit L100, is the discharge tube load circuit that is connected in parallel with discharge tube load circuit L100, by choke 9, and discharge tube 10, electric capacity 11 and coupling capacitance 12 constitute.
The 4th, be connected the current transformer (hereinafter referred to as CT) between the tie point of parallel circuits of the tie point of pair of switches element 2 and 3 and discharge tube load circuit L100 and L110, these secondary winding transformers 4a, 4b is with the polarity of the symbol shown in scheming alternatively driving switch element 2 and 3 ON (connection), OFF (disconnection) is connected the grid of above-mentioned switch element 2 and 3 like that by resistance 14 and resistance 13, between the source electrode.(dotted line shown in the figure is represented the coupling of primary winding and the secondary winding transformer of CT4).In addition, in diagram, omitted drain electrode, built-in in parallel equivalent diode between the source electrode in switch element 2 and 3.Again, 64 is the resistance that an end is connected with the positive pole of DC power supply 1, is connected by the negative pole of electric capacity 66 with DC power supply 1.The 67th, the diode that anode is connected with the tie point of resistance 64 and electric capacity 66, its negative electrode and switch element 2 are connected with 3 tie point.
68 is that (hereinafter referred to as diac, for example, the N413 that NEC makes etc. are suitable therewith for the planar shaped silicon amphicheirality diac that is connected with the tie point of resistance 64 and electric capacity 66 of an end.), be connected by the grid of resistance 69 with switch element 3.P100 is the PP testing circuit that discharge tube load circuit L100 uses, in this PP testing circuit P100,50,51st, the electric capacity that is connected in series, one end of electric capacity 50 is connected with the negative pole of DC power supply 1, and the other end of electric capacity 51 is connected with the tie point of choke 5 with discharge tube 6.The 52nd, anode is connected with the negative pole of DC power supply 1, the diode that negative electrode and electric capacity 50 are connected with electric capacity 51 tie points.And, with voltage (peak to peak voltage) between the peak value that is added between the tie point a100 of choke 5 and discharge tube 6 and the negative pole b100 of DC power supply 1 (as shown in the figure near the anode of diode 52), be fetched into the anode of diode 56 inversely with the direct capacitance value of electric capacity 51 and electric capacity 50.
P110 is the PP testing circuit that discharge tube load circuit L110 uses, in this PP testing circuit P110,53,54th, the electric capacity that is connected in series, one end of electric capacity 53 is connected with the negative pole of DC power supply 1, and the other end of electric capacity 54 is connected with the tie point of choke 9 with discharge tube 10.The 55th, anode is connected with the negative pole of DC power supply 1, the diode that negative electrode and electric capacity 50 are connected with electric capacity 51 tie points.
And, with voltage between the peak value that is added between the tie point a110 of choke 9 and discharge tube 10 and the negative pole b110 of DC power supply 1 (as shown in the figure near the anode of diode 55), be fetched into the anode of diode 57 inversely with the direct capacitance value of electric capacity 54 and electric capacity 53.
56,57th, negative electrode interconnects, anode respectively with PP testing circuit P110, the diode that P110 connects.
H100 is a holding circuit, the Zener diode 61 that is connected with 57 tie point by negative electrode and diode 56, be connected in series in resistance 60 and resistance 59 between the negative pole of the anode of Zener diode 61 and DC power supply 1, the diode 63 that anode is connected with the grid of switch element 3, negative electrode is connected with the negative pole of DC power supply 1, anode is connected with the positive pole of resistance 64 with DC power supply 1 by the negative electrode of diode 63, the thyristor 62 that grid is connected with the tie point of resistance 60 and resistance 61, and the electric capacity 58 that is connected between the negative pole of the tie point of negative electrode of diode 56 and diode 57 and DC power supply 1 constitutes.And, at the two ends of electric capacity 58, detecting PP testing circuit P100, a side high in the crest voltage of P110 is as direct voltage.
In addition, the configuration example of the DC power supply 1 when source power supply obtains DC power supply as shown in Figure 6.
As shown in Figure 6, be after diode bridge 1b full-wave rectification from the AC power of source power supply 1a output, smoothed electric capacity 1c smoothing as DC power supply, outputs to that load circuit constitutes like that.
Secondly, we illustrate the circuit working of existing example shown in Figure 5.In Fig. 5, insert DC power supply 1, charge from 1 pair of electric capacity 66 of DC power supply by resistance 64.
The charging voltage of electric capacity 66 rises to breakover voltage than diac 68 when high, to the electric charge of electric capacity 66 chargings by diac 68, resistance 69, resistance 13, secondary winding transformer 4b discharge.Because this discharging current is at resistance 13, secondary winding transformer 4b goes up the voltage that takes place connects switch element.
At this moment, the electric charge by 7,11,8,12 chargings of 230 pairs of electric capacity of resistance passes through CT4, the path discharge of switch element 3.
And, the voltage that switch element 3 is connected, the voltage that switch element 2 is disconnected is because this voltage further makes switch element 3 connect.On the other hand, because the voltage of electric capacity 66 is owing to discharge descends, institute is so that diac 68 disconnections.Again, the electric current that flows through CT4 is through by discharge tube load circuit L100, and all after dates of decision such as the circuit constant of L110 flow through the sense of current counter-rotating, therefore change switch element 2 specifically into and connect, and switch element 3 disconnects.After, switch element 2,3 alternatively is subjected to the driving of high frequency waves up to making discharge tube 6,10 igniting.Again, because the charging charge of electric capacity 66 is when switch element 3 is connected, by diode 67, switch element 3 discharges are not so diac 68 can be connected once more when the vibration continuation.
Here, for example, if discharge tube 6 is because end of lifetime has been waited until in the consumption of the discharging substance of filament, height when then the voltage at discharge tube 6 two ends rises to than normal ignition, P110 detects this change in voltage by the PP testing circuit, and the anode voltage of diode 56 rises, and the voltage of electric capacity 58 also rises.Again, by suitably selecting Zener diode 61, resistance 60 and resistance 59 make thyristor 62 because the voltage of the electric capacity 58 that obtains during the discharge tube normal ignition is disconnected, and when the such ground voltage of discharge tube end of lifetime rises because the voltage connection that on electric capacity 58, obtains.
If thyristor 62 is connected, then because the electric current of grid that flows through switch element 3 from the secondary winding transformer of CT4 by resistance 13 by diode 63, thyristor 62 bypasses are so switch element 3 disconnects the bypass circuit failure of oscillations.Even if, this state is remained to block till the DC power supply 1 always, in the state that continues paradoxical discharge, turn round so can prevent discharge tube 6 because the failure of oscillations also continues to flow to thyristor 62 by resistance 64 holding currents.We have illustrated the situation of discharge tube 6 undesired discharges in addition, but when being the undesired discharge of convenient discharge tube 10 and during the also undesired discharge of any one discharge tube, can prevent that too discharge tube from turning round in the state of continuation paradoxical discharge.
Summary of the invention
So, after only in existing discharge tube igniter as described above, existing discharge tube by still can not regular picture after will inserting DC power supply 1 and being replaced as the regular picture pipe and packing into, can not make the problem of discharge tube igniting again.Promptly, because after inserting DC power supply 1, make holding current continue to flow to thyristor 62 through resistance 64, make switch element 2,3 continue to disconnect, so in order to make the discharge tube igniting again, must be by after blocking the AC power 1a that constitutes DC power supply 1 and making thyristor 62 be in off-state, incoming transport power supply 1a again.
But, for AC power 1a, exist the igniter beyond this igniter, with situation that miscellaneous equipment is connected in the power supply of these igniters and equipment also the while is blocked such problem.Again, as the method for improving it, also exist among Fig. 5 and switch (not drawing among the figure) in series is set with DC power supply 1, load onto regular picture pipe displacement can not the discharge tube of regular picture after, after blocking DC power supply 1 with this switch, insert the existing example that DC power supply is lighted a fire discharge tube more again, but need the large-scale switch of high price, therefore, exist the constructional restriction condition that is arranged on the ligthing paraphernalia of this igniter serious problem that waits that becomes that makes.
The present invention proposes in order to solve problem as described above, the purpose of this invention is to provide because the consumption of the THE FILAMENT DISCHARGE AND material of discharge tube makes reasons such as the lost of life, after effect by PP testing circuit and holding circuit makes the vibration of switch element keep stopping, do not continue incoming transport power supply or DC power supply even if do not block AC power or DC power supply, if load onto regular picture pipe displacement since reasons such as life-span can not normal ignition discharge tube, then also can automatically make the cheap small-sized discharge tube igniter of discharge tube igniting again.
The discharge tube igniter relevant with the present invention is to have DC power supply, the converter circuit that becomes the half bridge circuit of the pair of switches element of high-frequency current to constitute by the DC converting that has this direct-current power supply, by choke, in the discharge tube igniter of the discharge tube load circuit that the series circuit of discharge tube and electric capacity constitutes, having DC power supply, the converter circuit that becomes the half bridge circuit of the pair of switches element of high-frequency current to constitute by the DC converting that has this direct-current power supply, by choke, in the discharge tube igniter of the discharge tube load circuit that the series circuit of discharge tube and electric capacity constitutes, have the paradoxical discharge state that detects above-mentioned discharge tube, stop and keeping the protective circuit of the vibration of above-mentioned converter circuit; With the reset circuit that stops the maintenance effect of removing this protective circuit, above-mentioned reset circuit has by the filament by above-mentioned discharge tube and is connected in series in the live part that diode between the both positive and negative polarity of DC power supply and electric capacity constitute; Carry out the electric capacity that is connected in series of differential and the differential part that resistance constitutes by voltage to this live part; With its input and differential part with electric capacity and the tie point of resistance is connected, its output is connected with protective circuit, and the control section that output is partly controlled the electric current that flows through above-mentioned protective circuit according to this differential.
Again, in having DC power supply, discharge tube igniter by the discharge tube load circuit that has converter circuit that DC converting with this direct-current power supply becomes the half bridge circuit of the pair of switches element of high-frequency current to constitute, constitutes by the series circuit of choke, discharge tube and electric capacity, have the paradoxical discharge state that detects above-mentioned discharge tube, stop and keeping the protective circuit of the vibration of above-mentioned converter circuit; With the reset circuit that stops the maintenance effect of removing this protective circuit, above-mentioned reset circuit has between the both positive and negative polarity that filament by above-mentioned discharge tube is connected on DC power supply, the live part that diode that charges by a plurality of impedance components that are connected in series, to this impedor voltage and electric capacity constitute; Carry out the electric capacity of differential and the differential part that resistance constitutes by voltage to this live part; With the control section of the electric current that flows through above-mentioned protective circuit being controlled according to the output of this differential part.
Again, impedance component is a resistance.
Possesses the resistance that the electric capacity with live part is connected in parallel again.
Make about more than 10 times in cycle of oscillation of converter circuit of amassing of the capacitance of electric capacity of live part and the resistance value that is connected in parallel with above-mentioned electric capacity, approximately below the 10S again.
Again, have a plurality of discharge tube load circuits, have that each current limiting element of a pair of process and pair of switches element be connected in parallel by being provided with respectively on the choke of these discharge tube load circuits, output drives the secondary coil of the voltage of above-mentioned pair of switches element.
Description of drawings
Fig. 1 is the circuit diagram of the discharge tube igniter of expression example 1 of the present invention.
Fig. 2 is the oscillogram that the work of the discharge tube igniter of representing example 1 of the present invention is described.
Fig. 3 is the circuit diagram of the discharge tube igniter of expression example 2 of the present invention.
Fig. 4 is the circuit diagram of the discharge tube igniter of expression example 3 of the present invention.
Fig. 5 is the circuit diagram of existing discharge tube igniter.
Fig. 6 is the circuit diagram that the DC power supply of the existing discharge tube igniter of expression constitutes.
Embodiment
Example 1
Fig. 1 is the circuit diagram that the discharge tube igniter of expression example 1 of the present invention constitutes, and Fig. 2 is the oscillogram of the work of explanation discharge tube igniter.
In the drawings, the 1st, the DC power supply that obtains from source power supply, 2 and 3 switch elements of forming by the MOSFET that constitutes converter circuit, the 230th, the resistance that is connected in parallel with switch element 2, L100 is the discharge tube load circuit, by choke 5, discharge tube 6, the electric capacity 7 and the coupling capacitance 8 that are connected in parallel with discharge tube 6 constitute.L110 has the identical formation with discharge tube load circuit L100, is the discharge tube load circuit that is connected in parallel with discharge tube load circuit L100, by choke 9, and discharge tube 10, electric capacity 11 and coupling capacitance 12 constitute.
The 4th, be connected the current transformer (hereinafter referred to as CT) between the tie point of parallel circuits of the tie point of pair of switches element 2 and 3 and discharge tube load circuit L100 and L110, these secondary winding transformers 4a, 4b is with the polarity of the symbol shown in scheming alternatively driving switch element 2 and 3 ON (connection), OFF (disconnection) is connected the grid of above-mentioned switch element 2 and 3 like that by resistance 14 and resistance 13, between the source electrode.(representing the coupling of primary winding and the secondary winding transformer of CT4 with the dotted line shown in the figure).In addition, the drain electrode of ensconcing switch element 2 and 3 in diagram, having omitted in parallel, the equivalent diode between the source electrode.Again, 64 is the resistance that an end is connected with the positive pole of DC power supply 1, is connected by the negative pole of electric capacity 66 with DC power supply 1.The 67th, the diode that anode is connected with the tie point of resistance 64 and electric capacity 66, its negative electrode and switch element 2 are connected with 3 tie point.
68 is that (hereinafter referred to as diac, for example, the N413 that NEC makes etc. are suitable therewith for the planar shaped silicon amphicheirality diac that is connected with the tie point of resistance 64 and electric capacity 66 of an end.), be connected by the grid of resistance 69 with switch element 3.P100 is the PP testing circuit that discharge tube load circuit L100 uses, in this PP testing circuit P100,50,51st, the electric capacity that is connected in series, one end of electric capacity 50 is connected with the negative pole of DC power supply 1, and the other end of electric capacity 51 is connected with the tie point of choke 5 with discharge tube 6.The 52nd, anode is connected with the negative pole of DC power supply 1, the diode that negative electrode and electric capacity 50 are connected with electric capacity 51 tie points.And, with voltage (peak to peak voltage) between the peak value that is added between the tie point a100 of choke 5 and discharge tube 6 and the negative pole b100 of DC power supply 1 (as shown in the figure near the anode of diode 52), be fetched into the anode of diode 56 inversely with the direct capacitance value of electric capacity 51 and electric capacity 50.
P110 is the PP testing circuit that discharge tube load circuit L110 uses, in this PP testing circuit P110,53,54th, the electric capacity that is connected in series, one end of electric capacity 53 is connected with the negative pole of DC power supply 1, and the other end of electric capacity 54 is connected with the tie point of choke 9 with discharge tube 10.The 55th, anode is connected with the negative pole of DC power supply 1, the diode that negative electrode and electric capacity 50 are connected with electric capacity 51 tie points.
And, with voltage between the peak value that is added between the tie point a110 of choke 9 and discharge tube 10 and the negative pole b110 of DC power supply 1 (as shown in the figure near the anode of diode 55), be fetched into the anode of diode 57 inversely with the direct capacitance value of electric capacity 54 and electric capacity 53.
56,57th, negative electrode interconnects, anode respectively with PP testing circuit P100, the diode that P110 connects.
H100 is a holding circuit, the Zener diode 61 that is connected with 57 tie point by negative electrode and diode 56, be connected in series in resistance 60 and resistance 59 between the negative pole of the anode of Zener diode 61 and DC power supply 1, the diode 63 that anode is connected with the grid of switch element 3, negative electrode is connected with the negative pole of DC power supply 1, anode is by being connected with the positive pole of resistance 64 with DC power supply 1 with the negative electrode of diode 63, the thyristor 62 that grid is connected with the tie point of resistance 60 and resistance 61, and the electric capacity 58 that is connected between the negative pole of the tie point of negative electrode of diode 56 and diode 57 and DC power supply 1 constitutes.And, detecting PP testing circuit P100 at the two ends of electric capacity 58, a side high in the crest voltage of P110 is as direct voltage.
R100 is the reset circuit that discharge tube load circuit L100 uses, the live part that the diode 202 that is connected with the tie point of discharge tube 6 and electric capacity 7 by anode and the electric capacity 204 that the negative electrode from it is connected with the negative pole of DC power supply 1 constitute, the resistance 205 that is connected in parallel with electric capacity 204, the differential part that resistance 220 between the electric capacity 203 that is connected with the negative electrode of diode 202 by an end and the negative pole of the other end that is connected electric capacity 203 and DC power supply 1 constitutes, with be connected with the tie point of resistance 64 as collector with diode 65, emitter is connected with the negative pole of DC power supply 1, and the transistor 221 of the control section that base stage is connected with the tie point of electric capacity 203 and resistance 220 constitutes.
R110 is the reset circuit that discharge tube load circuit L110 uses, the live part that the diode 212 that is connected with the tie point of discharge tube 10 and electric capacity 11 by anode and the electric capacity 214 that the negative electrode from it is connected with the negative pole of DC power supply 1 constitute, the resistance 215 that is connected in parallel with electric capacity 214, the differential part that resistance 220 between the electric capacity 213 that is connected with the negative electrode of diode 212 by an end and the negative pole of the other end that is connected electric capacity 213 and DC power supply 1 constitutes, with be connected with the tie point of resistance 64 as collector with diode 65, emitter is connected with the negative pole of DC power supply 1, and the transistor 221 of the control section that base stage is connected with the tie point of electric capacity 213 and resistance 220 constitutes.In addition, with shared resistance 220 of reset circuit R100 and transistor 221.
Secondly, we use Fig. 1,2 explanation work.Fig. 2 (a) is reset circuit R100, and the voltage oscillogram of each electric capacity 204,214 of R110, Fig. 2 (b) are that Fig. 2 (a) is carried out the differential voltage waveform that differential flows through resistance 220.
In Fig. 1, when inserting DC power supply 1 (t1 of Fig. 2), electric current passes through resistance 230, CT4, and choke 5, the filament of charging valve 6, the path flow of diode 202, shown in Fig. 2 (a), the voltage of the electric capacity 204 of live part rises.Variation of up voltage is passed through by electric capacity 203 on this, and the differential part that resistance 220 constitutes obtains the differential voltage waveform shown in Fig. 2 (b) on resistance 220.
Equally, electric current passes through resistance 230, CT4, and choke 9, the filament of charging valve 10, the path flow of diode 212, shown in Fig. 2 (a), the voltage of the electric capacity 214 of live part rises.Variation of up voltage is passed through by electric capacity 213 on this, and the differential part that resistance 220 constitutes obtains same differential voltage waveform on resistance 220.
Like this, because the differential voltage waveform shown in Fig. 2 (b), transistor 221 has only during maximum T1 to be connected, and makes during this from DC power supply 1 and flows through the electric current of electric capacity 66 by diode 65 by transistor 221.And transistor 221 transfers disconnection to when surpassing during the T1, charges by 64 pairs of electric capacity 66 of resistance from DC power supply 1.
When the charging voltage of electric capacity 66 rises to breakover voltage than diac 68 when high, the electric charge that electric capacity 66 is charged is by diac 68, resistance 69, resistance 13, secondary winding transformer 4b discharge.Because this discharging current is at resistance 13, secondary winding transformer 4b goes up the voltage that produces, and switch element is connected.
At this moment, the electric charge by 7,11,8,12 chargings of 230 pairs of electric capacity of resistance passes through CT4, the path discharge of switch element 3.And, on the secondary winding transformer 4b of CT4, produce the voltage that switch element 3 is connected, on secondary winding transformer 4a, produce the voltage that switch element 2 is disconnected, because this voltage further makes switch element 3 connect.On the other hand, because the voltage of electric capacity 66 is owing to discharge descends, so diac 68 disconnects.
Again, the electric current that flows through CT4 flows through the sense of current counter-rotating at all after dates of process by the decisions such as circuit constant of discharge tube load circuit L100 and L110, therefore changes switch element 2 specifically into and connects, switch element 3 disconnections.After, switch element 2,3 alternatively is subjected to the driving of high frequency waves up to making discharge tube 6,10 igniting.Again, because the charging charge of electric capacity 66 is when switch element 3 is connected, by diode 67, switch element 3 discharges are not so diac 68 can be connected once more when the vibration continuation.Again, because continue electric capacity 204,214 is charged by diode 202,212 during the discharge tube igniting, if it is so suitably selected as electric capacity 204, the resistance 205,215 of 214 discharge resistance is then shown in Fig. 2 (a), electric capacity 204,214 voltage becomes the direct current that does not roughly have change, and the differential voltage at resistance 220 two ends also is roughly zero shown in Fig. 2 (b), and transistor 221 can not connected.
Here, if for example discharge tube 6 is because end of lifetime has been waited until in the consumption of the discharging substance of filament, height when then the voltage at discharge tube 6 two ends rises to than normal ignition, P110 detects this change in voltage by the PP testing circuit, the anode voltage of diode 56 rises, and the voltage of electric capacity 58 also rises.Again, by suitably selecting Zener diode 61, resistance 60 and resistance 59 make thyristor 62 because the voltage of the electric capacity 58 that obtains is disconnected when the discharge tube normal ignition, and when the such ground voltage of discharge tube end of lifetime rises owing to the voltage connection that on electric capacity 58, obtains.
If thyristor 62 is connected, then because the electric current of grid that flows through switch element 3 from the secondary winding transformer 4b of CT4 through resistance 13 by diode 63, thyristor 62 bypasses are so switch element 3 disconnects the converter circuit failure of oscillations.Even if because the failure of oscillations, holding current also continues to flow to thyristor 62 by resistance 64, this state is remained to always block till the DC power supply 1, so can prevent from the state of continuation paradoxical discharge, to turn round at discharge tube 6.
Here, shown in Fig. 2 (a), when time t2 takes out discharge tube 6 for discharge tube 6 is replaced as the discharge tube of regular picture, because blocked from the charge path of DC power supply 1 to electric capacity 204, so the charging charge of electric capacity 204 is by resistance 205 discharges, shown in Fig. 2 (a), decay.In Fig. 2 (b), represented the differential voltage waveform that at this moment on resistance 220, obtains.And, time t3 load onto at discharge tube 6 places can normal ignition discharge tube the time, charging current is by DC power supply 1 shown in Fig. 2 (a), resistance 230, CT4, choke 5, the filament of discharge tube 6, the path of diode 202 flows to electric capacity 204, and the voltage of electric capacity 204 is risen.
The voltage of electric capacity 204 rises and changes through electric capacity 203, and the differential of resistance 220 obtains the differential voltage waveform shown in Fig. 2 (b) on resistance 220.Because because this differential voltage; transistor 221 is connected during maximum T4; make the current bypass that flows through thyristor 62 by resistance 64, so that the electric current of thyristor 62 changes to holding current is following and disconnect, de-preservation circuit H100 stops the maintenance effect.
Because after during the T4, transistor 221 disconnects, so because electric current flows to electric capacity 66 by diode 65, diac 68 is connected, the converter circuit that is made of switch element 2,3 produces the higher-order of oscillation once more, makes the discharge tube igniting.
Like this, when the voltage of live part takes place to rise when changing, de-preservation circuit H100 stops the maintenance effect.
Again, our explanation is because for the exchanging operation of discharge tube in the ligthing paraphernalia, take out behind the paradoxical discharge pipe to can load onto the regular picture pipe during (T3 of Fig. 2 (b)) to lack, institute so that during this period weak point carry out like that during setting.
As mentioned above, when taking out discharge tube, the resistance 205,215 that is connected in parallel with electric capacity 204,214 plays a part to make the charging charge of above-mentioned electric capacity to discharge.
That is, when the resistance value of resistance 205,215 is big shown in Fig. 2 (a) during T2 become big, take out behind the paradoxical discharge pipe to can load onto the regular picture pipe during T3 elongated.
Again, when resistance 205, electric capacity 204 during the igniting of the little and discharge tube of 215 resistance value, 214 voltage also becomes big and produces ripple voltage, therefore, on resistance 220, produce differential voltage, transistor 221 is connected, even if the discharge tube paradoxical discharge can not keep the converter circuit failure of oscillations with thyristor 62.
The ripple voltage that produces on electric capacity 204,214 is easy to produce and makes electric capacity 204 and resistance 205, electric capacity 214 and resistance 215 long-pending less than 10 times situation cycle of oscillation approximately.
So, even if for fear of the discharge tube paradoxical discharge, can not keep the situation of the converter circuit failure of oscillations to take place with thyristor 62, by making resistance 205 as far as possible, 215 resistance value is little, T2 is short during this time, makes T3 short, selected electric capacity 204 and resistance 205, the long-pending cycle of oscillation about converter circuit of electric capacity 214 and resistance 215 is more than 10 times, the ripple voltage that can suppress electric capacity 204,214, and can prevent that transistor 221 from unwanted action taking place.
About cycle of oscillation, for example, when making transmission frequency be 50kHz, this cycle is 20 μ S, and its 10 times are 0.2mS.
Again, because take out behind the paradoxical discharge pipe to can load onto the regular picture pipe during T3 when roughly surpassing 10S, the practicality of the operator's who carries out common discharge tube exchange work is descended, so in order to make electric capacity 204 and resistance 205, each of electric capacity 214 and resistance 215 long-pending below 10S like that, the capacitance and the resistance 205 of selected electric capacity 204,214,215 resistance value improves the practicality of the operator's who carries out common discharge tube exchange work.
As mentioned above, if according to this example 1, then because the consumption of the THE FILAMENT DISCHARGE AND material of discharge lamp makes reasons such as the lost of life, by PP testing circuit P100, the effect of P110 and holding circuit H100 makes switch element 2, after the 3 maintenance failures of oscillations, do not continue to insert even if do not block AC power 1a or DC power supply 1,, then can discharge tube be lighted a fire again if the displacement discharge tube is loaded onto the discharge tube of regular picture.Therefore, have can not block be connected with the same power supply of this igniter other discharge tube and the power supply of equipment, carry out discharge tube exchange and the cautious effect of confirming.Again, because need the switch of the large-scale high price of blocking AC power and DC power supply be set on each igniter, so can make the igniter small inexpensive.
Again; because make resistance 205; 215 respectively with the electric capacity 204 of live part; 214 are connected in parallel; even if do not continue to insert, when loading onto the regular picture pipe and replace the discharge tube of undesired igniting, also can shorten to the time that the vibration of removing above-mentioned protective circuit stops the maintenance effect so do not block AC power or DC power supply; thereby can improve the work practicality of operator in the discharge tube exchange of common ligthing paraphernalia, and can realize cheapness and miniaturization.
Again; because make about more than 10 times in cycle of oscillation of converter circuit of amassing of the capacitance of electric capacity of live part and the resistance value that is connected in parallel with above-mentioned electric capacity; approximately below the 10S; even if do not continue to insert so do not block AC power or DC power supply; replace the time of the discharge tube of undesired igniting when being roughly 10 seconds short time when loading onto the regular picture pipe; the vibration that also can remove above-mentioned protective circuit stops the maintenance effect, can improve the work practicality of operator in the discharge tube exchange of common ligthing paraphernalia.
In addition, above we have illustrated the situation of discharge tube 6 abnormal ignition, but we can see when discharge tube 10 and become the paradoxical discharge state, load onto the displacement of regular picture pipe it the time also can access identical effect.Again, we have illustrated the situation of 2 discharge tube load circuits parallel connection, even if but in the situation more than 1 or 3, the reset circuit corresponding by setting and discharge tube load circuit also can access identical effect.
Example 2
Fig. 3 is the circuit diagram that the discharge tube igniter of expression example 2 of the present invention constitutes.
In Fig. 3, on the part identical, add identical label and omission explanation to them with Fig. 1 of example 1.The 200th, as the impedor resistance between the anode of tie point that newly inserts discharge tube 6 and electric capacity 7 and diode 202, the 201st, as the impedor resistance between the negative pole of anode that is connected diode 202 and DC power supply 1.Again, 210,211st, in reset circuit R110, with the resistance of resistance 200,201 correspondences of reset circuit R100.
In Fig. 3, because being the voltage by resistance 200 and 201 pairs of discharge tubes of resistance 6 and the tie point of electric capacity 7, the anode voltage of diode 202 carries out the voltage that dividing potential drop obtains, so can use parts as diode 202 with low voltage endurance, electric capacity 204, thus can realize cheapness and miniaturization.Can access identical effect with example 1 again.
In addition, replace resistance 200,201,210,211 also can replace resistance to carry out dividing potential drop with electric capacity.
Example 3
Fig. 4 is the circuit diagram that the discharge tube igniter of expression other example 3 of the present invention constitutes.On the part identical, add identical label and omission explanation to them with Fig. 1 of example 1.
Fig. 4 has in Fig. 2 of example 2, and deletion CT4 replaces it to use the secondary winding transformer 5a of choke 5, and 5b is by resistance 14,13 driving switch elements 2,3, same, secondary winding transformer 9a is set on choke 9,9b is with resistance 16, the 15 such formation of driving switch element 2,3 in parallel.
In this formation, because can save CT4, so can realize cheapness and miniaturization.Can access identical effect with example 2 again.
As mentioned above; if according to the present invention; then having DC power supply; the converter circuit that becomes the half bridge circuit of the pair of switches element of high-frequency current to constitute by the DC converting that has this direct-current power supply; choke; in the discharge tube igniter of the discharge tube load circuit that constitutes by the series circuit of discharge tube and electric capacity; because have the paradoxical discharge state that detects above-mentioned discharge tube; the protective circuit that keeps the above-mentioned converter circuit failure of oscillations; with the reset circuit that stops the maintenance effect of removing this protective circuit; above-mentioned reset circuit has by the filament by above-mentioned discharge tube and is connected on the live part that diode between the both positive and negative polarity of DC power supply and electric capacity constitute; carry out the electric capacity of differential and the differential part that resistance constitutes by voltage to this live part; with the control section of the electric current that flows through above-mentioned protective circuit being controlled according to the output of this differential part; so because the consumption of the THE FILAMENT DISCHARGE AND material of discharge tube makes reasons such as the lost of life; after the vibration of maintained switch element stops; do not continue to insert even if do not block AC power or DC power supply; if load onto regular picture pipe displacement discharge tube, then also can discharge tube be lighted a fire again.
Therefore, have can not block be connected with the same power supply of this igniter other discharge tube and the power supply of equipment, carry out discharge tube exchange and the cautious effect of confirming.
Again, because need the switch of the large-scale high price of blocking AC power and DC power supply be set on each igniter, so can make the igniter small inexpensive.
Claims (6)
1. discharge tube igniter, its feature is
In having DC power supply, discharge tube igniter, have by the discharge tube load circuit that has converter circuit that DC converting with this direct-current power supply becomes the half bridge circuit of the pair of switches element of high-frequency current to constitute, constitutes by the series circuit of choke, discharge tube and electric capacity
Detect the paradoxical discharge state of above-mentioned discharge tube, stop and keeping the protective circuit of the vibration of above-mentioned converter circuit; With
Remove the reset circuit that stops the maintenance effect of this protective circuit,
Above-mentioned reset circuit has
Be connected in series in the live part that diode between the both positive and negative polarity of DC power supply and electric capacity constitute by filament by above-mentioned discharge tube;
The voltage of this live part is carried out the differential part that constitutes by electric capacity that is connected in series and resistance of differential; With
Its input and differential part with electric capacity and the tie point of resistance is connected, its output is connected with protective circuit, and the control section that output is partly controlled the electric current that flows through above-mentioned protective circuit according to this differential.
2. discharge tube igniter, its feature is
In having DC power supply, discharge tube igniter, have by the discharge tube load circuit that has converter circuit that DC converting with this direct-current power supply becomes the half bridge circuit of the pair of switches element of high-frequency current to constitute, constitutes by the series circuit of choke, discharge tube and electric capacity
Detect the paradoxical discharge state of above-mentioned discharge tube, stop and keeping the protective circuit of the vibration of above-mentioned converter circuit; With
Remove the reset circuit that stops the maintenance effect of this protective circuit,
Above-mentioned reset circuit has
Filament by above-mentioned discharge tube is connected between the both positive and negative polarity of DC power supply, the live part that diode that charges by a plurality of impedance components that are connected in series, to this impedor voltage and electric capacity constitute;
Carry out the electric capacity of differential and the differential part that resistance constitutes by voltage to this live part; With
The control section that output is partly controlled the electric current that flows through above-mentioned protective circuit according to this differential.
3. the discharge tube igniter of claim 2 record, its feature is that impedance component is a resistance.
4. the discharge tube igniter of any one record in the claim 1～3, its feature are to possess the resistance that the electric capacity with live part is connected in parallel.
5. the discharge tube igniter of claim 4 record, its feature are more than 10 times, below 10S of cycle of oscillation at converter circuit of amassing that make the capacitance of electric capacity of live part and the resistance value that is connected in parallel with above-mentioned electric capacity.
6. the discharge tube igniter of any one record in the claim 1～3, its feature is to have a plurality of discharge tube load circuits, have on the choke that is separately positioned on these discharge tube load circuits, and be connected in parallel by each current limiting element and pair of switches element, output drives a pair of secondary coil of the voltage of above-mentioned pair of switches element.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002221227A JP2004063320A (en) | 2002-07-30 | 2002-07-30 | Discharge lamp lighting device |
| JP221227/2002 | 2002-07-30 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1472998A CN1472998A (en) | 2004-02-04 |
| CN1320845C true CN1320845C (en) | 2007-06-06 |
Family
ID=30437678
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB02147155XA Expired - Fee Related CN1320845C (en) | 2002-07-30 | 2002-10-24 | Discharge tube ignitor |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP2004063320A (en) |
| CN (1) | CN1320845C (en) |
| TW (1) | TW569649B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1745605B (en) | 2003-01-29 | 2010-04-28 | 三垦电气株式会社 | Discharge tube operation device |
| JP4617231B2 (en) * | 2005-09-16 | 2011-01-19 | 太陽誘電株式会社 | Lamp drive device |
| TWI409740B (en) * | 2008-06-06 | 2013-09-21 | Ampower Technology Co Ltd | Inverter circuit |
| PL218353B1 (en) * | 2009-12-10 | 2014-11-28 | Azo Digital Spółka Z Ograniczoną Odpowiedzialnością | Method for controlling high-pressure discharge lamp and power-supply system for the high-pressure discharge lamp |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2088772U (en) * | 1991-01-02 | 1991-11-13 | 陈广林 | Staring device for fluorescent lamp switch |
| CN1335738A (en) * | 2000-07-12 | 2002-02-13 | 哈里逊东芝灯具株式会社 | Discharge tube lighting apparatus |
-
2002
- 2002-07-30 JP JP2002221227A patent/JP2004063320A/en active Pending
- 2002-09-11 TW TW91120769A patent/TW569649B/en not_active IP Right Cessation
- 2002-10-24 CN CNB02147155XA patent/CN1320845C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2088772U (en) * | 1991-01-02 | 1991-11-13 | 陈广林 | Staring device for fluorescent lamp switch |
| CN1335738A (en) * | 2000-07-12 | 2002-02-13 | 哈里逊东芝灯具株式会社 | Discharge tube lighting apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| TW569649B (en) | 2004-01-01 |
| CN1472998A (en) | 2004-02-04 |
| JP2004063320A (en) | 2004-02-26 |
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Granted publication date: 20070606 Termination date: 20191024 |