CN1523945A - Discharge lamp starting apparatus - Google Patents
Discharge lamp starting apparatus Download PDFInfo
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- CN1523945A CN1523945A CNA031493327A CN03149332A CN1523945A CN 1523945 A CN1523945 A CN 1523945A CN A031493327 A CNA031493327 A CN A031493327A CN 03149332 A CN03149332 A CN 03149332A CN 1523945 A CN1523945 A CN 1523945A
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Abstract
Provided is a discharge lamp lighting device stopping an inverter circuit when a discharge lamp is out of order irrespective of the kinds of the lamps, lighting a plurality of kinds of discharge lamps having almost the same rated current and different rated voltages. The device is provided with the inverter circuit converting a direct current supplied from a direct-current power source 1 into a high-frequency current, a discharge lamp load circuit lighting the discharge lamp 7, 11 with the high-frequency current from the inverter circuit, a positive/negative peak detecting circuit P300 dividing and outputting the positive/negative value detected at a peak detecting part detecting the peak value of a discharge voltage of the positive/negative half cycle of the discharge lamps 7, 11 by an impedance element, and a judging circuit H100 outputting a stop signal for stopping oscillation of the inverter circuit when an output voltage of the positive/negative peak detecting circuit P300 is out of a prescribed range.
Description
Technical field
The high-frequency current that the present invention relates to utilize inverter circuit to produce makes the discharge lamp starting device of discharge lamp starting, relates in particular to the discharge lamp starting device of the protective circuit with the starting device that can start the multiple discharge lamp that rated current is basic identical, rated voltage is different.
Background technology
Used discharge lamp starting device (for example patent documentation 1) is for the discharge lamp starting device that disposes inverter circuit INV, capacitor CO, load circuit Z, the filament that has adopted the low-pressure end that has also comprised discharge lamp La between the high-pressure side of discharge lamp La and earthed circuit is in interior formation, comprising: also comprise this low-pressure end filament both end voltage, detect the tube voltage detector 1 of the tube voltage of discharge lamp La; Detect when discharge lamp La is one-sided to raise each several part voltage, the non-symmetric component testing circuit 2 of the non-symmetric component of electric current because of dangerous discharge generation; With the output of tube voltage detector 1 and the output of non-symmetric component detector 2 " or " after, generation is used to make the output of inverter circuit INV to reduce so that the signal that stops, export to the OR circuit 3 (patent documentation 1) of abridged control circuit among the figure, the spy opens 2002-83698 (0012～0040 section, Fig. 1～13)
The solution of patent documentation 1 must possess with detect the filament voltage detection means of filament voltage and detect the output of tube voltage detection means of tube voltage of discharge lamp synthetic after, and be set at the normal value that surpassed discharge lamp and do not compare the 1st detection means of judgement to the setting of end of lifetime.
Yet, under the situation that is set at basic identical and a plurality of the discharge lamps that wattage is different of available same discharge lamp starting device starting rated current, as the precondition that realizes above-mentioned the 1st detection means, described in " 0019 " section, filament F must be designed to identically, exist the problem that must satisfy prerequisite.In addition, when the value of normal value that compares to determine above-mentioned detection means 1 and end of lifetime, there are the problem that has strengthened the circuit design workload in the individual difference of clear and definite tested discharge lamp and the difference between manufacturer in advance.
Summary of the invention
The present invention proposes at the problems referred to above just; primary and foremost purpose of the present invention is: among the starting device that can start the multiple discharge lamp that rated current is basic identical, rated voltage is different; no matter it is that a kind of discharge lamp is provided for which kind of type; end of lifetime that all can the reliable Detection discharge lamp and abnormal conditions such as inoperative, the discharge lamp starting device with protective circuit that the oscillation action that can make inverter circuit stops.
In addition; the 2nd purpose of the present invention is: among the starting device that can start the multiple discharge lamp that rated current is basic identical, rated voltage is different; even a kind of, discharge lamp series that rated voltage different basic identical for rated current is provided, do not change the discharge lamp starting device that the circuit constant of protective circuit also can be tackled.
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 is transformed to the inverter circuit of high-frequency current; Utilize the discharge lamp load circuits of the high-frequency current discharge at starting lamp that this inverter circuit provides; And the protective circuit that above-mentioned inverter is stopped according to the voltage of above-mentioned discharge lamp.Among this discharge lamp starting device, above-mentioned protective circuit is made of following each several part: with the positive and negative peak detection circuit of impedance component with output after the peak value dividing potential drop of the discharge voltage of the positive and negative half period separately of above-mentioned discharge lamp; When the output voltage of this positive and negative peak detection circuit exceeded the scope of predesignating, output made the decision circuit of the stop signal of the above-mentioned inverter 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.
Description of drawings
Fig. 1 is the circuit diagram that the discharge lamp starting device of expression embodiments of the present invention 1 constitutes.
Fig. 2 is the circuit diagram of decision circuit of the discharge lamp starting device of embodiments of the present invention 1.
Fig. 3 is the circuit diagram of the DC power supply when source power supply is obtained DC power supply.
Fig. 4 is the action specification figure of the discharge lamp starting device of embodiments of the present invention 1.
Fig. 5 is the circuit diagram that the major part of the discharge lamp starting device of expression embodiments of the present invention 2 constitutes.
Fig. 6 is the action specification figure of the discharge lamp starting device of embodiments of the present invention 2.
Fig. 7 is the circuit diagram that the discharge lamp starting device of expression embodiments of the present invention 3 constitutes.
Embodiment
(execution mode 1)
Fig. 1 is the circuit diagram that the discharge lamp starting device of expression embodiments of the present invention 1 constitutes, Fig. 2 is the circuit diagram of the decision circuit of above-mentioned discharge lamp deivce, Fig. 3 is the circuit diagram of the DC power supply when source power supply is obtained DC power supply, and Fig. 4 is the action specification figure of discharge lamp starting device.
Among Fig. 1, obtain DC power supply 1 from source power supply, inverter circuit is made of switch element MOSFET2,3.Discharge lamp load circuits L100 is made of choke 5, coupling capacitor 6, discharge lamp 7, the capacitor 8 in parallel with discharge lamp 7.The diode of installing in the other direction between the drain-source of switch element 2 and 3 then omits from diagram.
Discharge lamp load circuits L110 has the formation identical with discharge lamp load circuits L100, and L100 is in parallel with discharge lamp load circuits, is made of choke 9, coupling capacitor 10, discharge lamp 11, the capacitor 8 in parallel with discharge lamp 11.Oscillation control circuit 4 replaces ON/OFF switch element 2 and 3 with two outputs D1, D2.
Positive and negative peak detection circuit (below be referred to as ± the P testing circuit) P300 constitutes with a part of exporting after the impedance component dividing potential drop by the detector of the peak value of the discharge voltage of the positive and negative half period separately of detecting discharge lamp 7,11 and a positive negative peak that detects with peak detector.
Among the peak detector of the peak value of the discharge voltage of the positive and negative half period separately of detecting discharge lamp 7, one end of the capacitor 20 of series capacitors 20,21 links to each other with the negative pole of DC power supply 1, and the other end of capacitor 21 links to each other with the contact of coupling capacitor 6 with discharge lamp 7.The contact of the diode 51,56 that anode links to each other with negative electrode and capacitor 20 link to each other with 21 contact, and the negative electrode of diode 51 links to each other through the negative pole of capacitor 53 with DC power supply 1.The anode of diode 56 links to each other through the negative pole of capacitor 58 with DC power supply 1.
And capacitor 53,58 mark+as reference potential, mark+number electrode one end is a positive potential with the negative pole of DC power supply 1 in expression.
In addition, among the peak detector of the peak value of the discharge voltage of the positive and negative half period separately of detecting discharge lamp 11, one end of the capacitor 23 of series capacitors 23,24 links to each other with the negative pole of DC power supply 1, and the other end of capacitor 24 links to each other with the contact of coupling capacitor 10 with discharge lamp 11.
The contact of the diode 50,55 that anode links to each other with negative electrode and capacitor 23 link to each other with 24 contact, and the negative electrode of diode 50 links to each other through the negative pole of capacitor 53 with DC power supply 1, and the anode of diode 55 links to each other through the negative pole of capacitor 58 with DC power supply 1.
The positive negative peak that will detect with above-mentioned peak detector, the resistance 52 that the part of exporting afterwards with impedance component resistance 52,57 dividing potential drops is linked to each other with the contact of capacitor 53 and diode 51 by an end, and one end link to each other with the other end of resistance 52, the resistance 57 that the other end links to each other with the contact of capacitor 58 and diode 56, and one end and resistance 52 link to each other with 57 contact, the capacitor 54 that the other end links to each other with the negative pole of DC power supply 1 constitutes.
And the voltage of capacitor 53 indicates with V53, and the voltage of capacitor 54 indicates with V54, and the voltage of capacitor 58 indicates with V58.In addition, capacitor 53,58 mark+number expression with the negative pole of DC power supply 1 as reference potential, mark+number electrode one end be positive potential.
The action back of ± P testing circuit P300 also will be introduced in detail, is in a word will detect output after the peak value dividing potential drop of discharge voltage of positive and negative half period separately of discharge lamp 7,11 by peak detector with resistance 52,57.At this moment, the voltage V53 as capacitor 53 detects with the voltage of certain crest voltage correspondence of the positive half period of the discharge voltage of discharge lamp 7 and 11, and the voltage V58 as capacitor 58 detects with the voltage of certain crest voltage correspondence of negative half-cycle.
Decision circuit C100 is identical with the voltage V54 of the capacitor 54 of ± P testing circuit P300, the action of the output voltage of general ± P testing circuit P300 stops input voltage (Vsi1) as input, when this value surpasses the scope of predesignating, the voltage Vso of output high level.And the action that hereinafter Vso is referred to as stop signal stops output voltage.
Holding circuit H100 is connected by the lead-out terminal of grid with decision circuit C100, negative electrode is connected with the negative pole of DC power supply 1, and the resistance 35 that anode and is between the negative pole that low voltage level (below be referred to as low level) is the thyratron 36 that is connected of the S terminal of the oscillation control circuit 4 of the failure of oscillations and grid that is connected thyratron 36 and DC power supply 1 constitutes.
And ± P testing circuit P300, decision circuit C100 and holding circuit H100 constitute protective circuit jointly.
Introduce the physical circuit formation of decision circuit C100 below with Fig. 2.Among Fig. 2, identical with Fig. 1 or have the element of equivalent effect and the circuit key element adopts the label identical with Fig. 1 and omits its explanation.
Among decision circuit C100, the negative electrode of Zener (voltage stabilizing) diode 70 links to each other with the output voltage V si1 of ± P testing circuit P300, and anode links to each other with non-inverting input of comparator 74.Between the negative pole of the anode of Zener (voltage stabilizing) diode 70 and DC power supply 1, be connected resistance 71, between reverse input end of the power supply Vc of decision circuit and comparator 74, connecting resistance 73.Reverse input end of the anode of diode 72 and comparator 74 links to each other, and negative electrode links to each other with the negative pole of DC power supply 1, is being connected resistance 75 between the output of power supply Vc and comparator.
The anode of Zener diode 76 links to each other with the output voltage V si1 of ± P testing circuit P300, and negative electrode links to each other with reverse input end of comparator 78.Connecting resistance 77 between the anode of the negative electrode of Zener (voltage stabilizing) diode 76 and diode 72, non-inverting input of comparator 78 links to each other with the negative pole of DC power supply 1.Between the output of power supply Vc and comparator 78, connecting resistance 79.The diode 80 that anode links to each other with the output of comparator 78 is connected with each other with the negative electrode of the diode 81 that anode links to each other with the output of comparator 74, and output action stops output voltage V so.
And constitute as shown in Figure 3 when the circuit of the DC power supply 1 when source power supply is obtained DC power supply, after the AC power of source power supply 1a output is used diode bridge 1b full-wave rectification, 1c makes it smoothing with smmothing capacitor, exports to load circuit as DC power supply.
Introduce the action of embodiments of the present invention 1 below with Fig. 1, Fig. 2, Fig. 4.
Among Fig. 4, corresponding with the state of discharge lamp 7,11 elapsed time t, (a) stops output voltage V so for action for V54 (Vsi1), (d) for V58, (c) for V53, (b) waveform is shown respectively.
Among Fig. 1, DC power supply is promptly passed through oscillation control circuit 4 with high-frequency current driven switch element 2 and 3 once input, starts up to discharge lamp.
At first introduce the situation that discharge lamp shown in Figure 47 and 11 all is in the pattern 1 of normal condition here.Be that time t1 among the figure is during the t2 during the action of pattern 1.The both end voltage of discharge lamp 7 is by capacitor 20 and 21 dividing potential drops, the voltage of the positive half period of discharge, and through diode 51, with the polarity shown in Fig. 4 (a), peak value is charged among the capacitor 53.V53 then represents the voltage of capacitor 53.
In addition, the voltage of the negative half-cycle of discharge is through diode 56, is charged among the capacitor 58 with the polarity shown in Fig. 4 (b).V58 then represents the voltage of capacitor 58.Because discharge lamp 7 is regular picture, thereby the voltage of the positive and negative half period of discharge is equal substantially, and capacitor 53 can obtain the different voltage of equal and opposite in direction polarity with 58 voltage V53 with V58.At this, if the value of resistance 52 and 57 is chosen to be equal, then the voltage V54 of capacitor 54 as Fig. 4 (c) shown in, is zero then.Identical therewith, because discharge lamp 11 also is a normal starting, thereby through diode 50, the voltage V58 that obtains on capacitor 58 at the voltage V53 that obtains on the capacitor 53 with through diode 55 is as shown in Fig. 4 (a) and (b), can obtain equal and opposite in direction, voltage that polarity is different, the voltage V54 of capacitor 54 shown in Fig. 4 (c), is zero then.That is to say that among pattern 1, it is zero that the action of decision circuit C100 stops input voltage (Vsi1).
Among decision circuit C100, reverse input end of comparator 74, its power supply Vc is because of resistance 73 decompressions, diode 72 is if silicon diode, and then forward voltage is the current potential of about 0.6V, in contrast, its non-inverting input, owing to link to each other with the negative pole (zero potential) of DC power supply 1 with resistance 71, thereby the sub-voltage of reverse input end becomes more taller than the sub-voltage of non-inverting input, and its output voltage becomes low level.In addition, because of linking to each other corresponding with the negative pole (zero potential) of DC power supply 1 with non-inverting input of comparator 78, its reverse terminal is through resistance 77, about 0.6V of the anode voltage of diode 72, its output voltage becomes low level, the waveform that action stops output voltage V so also shown in Fig. 4 (d), becomes low level.Because it is low level that the action of decision circuit C100 output stops output voltage V so, thereby discharge lamp 7 and 11 maintenance regular event states are proceeded in the action of oscillation control circuit.
Described in above introduction, under the operate condition of pattern 1, no matter the kind of discharge lamp how, but all regular picture, if the discharge voltage of the positive and negative half period of its discharge is equal substantially, promptly can obtain no-voltage at capacitor 54 substantially, be identified as the vibration that the regular picture state continues inverter circuit afterwards.
Then introduce among Fig. 4, the THE FILAMENT DISCHARGE AND material of capacitor 21 sides of discharge lamp 7 is in consumption state, and discharge lamp 11 still is in the action of the pattern 2 of normal condition.During the action of pattern 2 be time t2 among the figure during the t3, be set at time t21 midway during this period, the discharging substance of the filament of capacitor 21 ends of discharge lamp 7 consumes.Under this operate condition, shown in the t21～t22 (t22 is the time that inverter circuit stops as aftermentioned) of Fig. 4 (b), the discharge voltage of the negative half-cycle of discharge lamp 7 becomes than the discharge voltage height of positive half period.That is to say that because the absolute value of the voltage of the voltage V58 of capacitor 58 becomes than the voltage V53 height of capacitor 53, thereby the voltage V54 (Vsi1) of capacitor 54 becomes negative potential shown in Fig. 4 (c).
Here, if suitably select the voltage of Zener (voltage stabilizing) diode 76 of decision circuit C100, for the action of ± P testing circuit P300 stops input voltage (Vsi1), with being set at of reverse input end of voltage comparator 78 than the low words of the sub-voltage of non-inverting input, then the sub-voltage of non-inverting input than the comparator 78 that links to each other with the negative pole (zero potential) of DC power supply 1 is also low, the output of comparator 78 becomes high level, the action of decision circuit C100 output stops output voltage V so then shown in Fig. 4 (d), becomes high level.
That is to say, when the action of the output voltage of ± P testing circuit P300 stops negative value that input voltage (Vsi1) (V54) predesignates than Zener (voltage stabilizing) diode 76 and also will hang down, the output of comparator 78 becomes high level, and the action of decision circuit C100 output stops output voltage V so becomes high level.
And, if become high level because action stops output voltage V so, the grid voltage of the thyratron 36 of holding circuit H100 also becomes high level, therefore thyratron 36 becomes the ON state, oscillation control circuit 4 stops to switch element 2,3 outputting drive voltages, be that inverter circuit becomes and stops (t22), discharge lamp 7 and 11 extinguishes.In addition, if being set at the electric current that still has above holding current flows through, then this state will remain to always and cut off till the DC power supply 1 among thyratron 36 this moment.
Though above only introduced the discharging substance consumption of filament of capacitor 21 sides of discharge lamp 7, and the still normal situation of discharge lamp 11, but obviously, the discharging substance consumption of the filament of capacitor 24 sides of and discharge lamp 11 normal at discharge lamp 7, under the situation that the discharging substance of the filament of perhaps any end that do not link to each other with DC power supply 1 has consumed, all can on capacitor 54, obtain negative pressure.
As mentioned above, among the operate condition of pattern 2, no matter the kind of discharge lamp how, when do not link to each other with the negative pole of DC power supply 1 discharging substance of filament of end of discharge lamp occurs under the situation such as consumption, all can obtain negative pressure at capacitor 54, voltage by decision circuit C100 output high level stops the action of inverter circuit, thereby can avoid discharge lamp to turn round under abnormality.And among above introduction, though only introduced the action the when reverse input end of comparator 78 is sub imports negative pressure, but in the circuit of comparator constitutes, adopted in the time of to import the element of negative pressure, also can make the input action of negative pressure also become possibility by drive the driving power of comparator with generating positive and negative voltage.
Introduce below among Fig. 4, the discharging substance of the filament of capacitor 20 sides of discharge lamp 7 consumes, and the still action of normal mode 3 of discharge lamp 11.During the action of mode 3 be t3 among the figure during the t4, be set at midway time t31 during this period, the discharging substance of the filament of capacitor 20 sides of discharge lamp 7 consumes.Under this operate condition, as t31～t32 (t32 is the dwell time of inverter circuit as aftermentioned) of Fig. 4 (b), the discharge voltage of the positive half period of discharge lamp 7 becomes the discharge voltage height than negative half-cycle.That is to say that because the absolute value of the voltage of the voltage V53 of capacitor 53 becomes than the voltage V58 height of capacitor 58, thereby the voltage V54 (Vsi1) of capacitor 54 becomes positive potential shown in Fig. 4 (c).
If suitably select the voltage of the Zener diode 70 of decision circuit C100 here, for the action of ± P testing circuit P300 stops input voltage (Vsi1), the voltage of non-inverting input of comparator 74 is set at words greater than the voltage of reverse input end, then the output of comparator 74 becomes high level, the action of decision circuit C100 output stops output voltage V so also shown in Fig. 4 (d), becomes high level.
That is to say, when the action of ± P testing circuit P300 output voltage stops input voltage (Vsi1) (V54) when being higher than the positive voltage value that Zener (voltage stabilizing) diode 70 predesignates, the output of comparator 74 becomes high level, and the action of decision circuit C100 output stops output voltage V so and becomes high level.
And, because stopping output voltage V so, action becomes high level, then the grid voltage of the thyratron 36 of holding circuit H100 also becomes high level, thereby thyratron 36 becomes the ON state, output by the driving voltage of 4 pairs of switch elements of oscillation control circuit 2,3 stops, be that inverter circuit becomes and stops (t32), discharge lamp 7 and 11 extinguishes, and this state will last till always and cut off till the DC power supply 1.
Though above only introduced the discharging substance consumption of filament of capacitor 20 sides of discharge lamp 7, and the still normal situation of discharge lamp 11, but obviously, discharge lamp 7 is normal, and the discharging substance consumption of the filament of capacitor 23 sides of discharge lamp 11, the discharging substance of the filament of DC power supply 1 link of perhaps any side and discharge lamp consumes Shi Junke and obtain positive voltage on capacitor 54.
Described in above introduction, under the operate condition of mode 3, no matter which kind of class discharge lamp is, when discharge lamp links to each other the situations such as discharging substance consumption of filament of end with the negative pole of DC power supply 1 under, all can obtain positive voltage at capacitor 54, stop the action of inverter circuit by decision circuit C100 output high level voltage, avoid discharge lamp under abnormality, to turn round.
And among pattern 2, when the action of ± P testing circuit P300 stops input voltage (Vsi1) and is lower than the negative pressure value that Zener diode 76 predesignates, among mode 3, when action stops input voltage (Vsi1) and is higher than the malleation value that Zener diode 70 predesignates, the output of comparator 74 becomes high level, the action of decision circuit C100 output separately stops output voltage V so and becomes high level, that is to say, when exceeding the scope of predesignating, inverter circuit can utilize holding circuit H100, quit work, but at discharge lamp 7,11 all under just often the situation of pattern 1, when ± the action of P testing circuit P300 stops input voltage (Vsi1) and is higher than the negative pressure value that Zener diode 76 is predesignated, when being lower than the malleation value that Zener diode 70 predesignates, that is to say, when being in the scope of predesignating, the output of comparator 74 becomes low level, the action of each decision circuit C100 output stops output voltage V so and becomes low level, and inverter circuit can not utilize the maintenance electricity to hold circuit H100 and quit work.
As above-mentioned, according to embodiments of the present invention 1, because no matter the discharge lamp kind how, the action of decision circuit C100 stops output voltage V so, if the discharging substance of the filament of discharge lamp normally promptly becomes low level, if the discharging substance consumption of the filament of certain discharge lamp, then become high level, even thereby basic identical with the rated current of same starting device discharge at starting lamp, under the situation of the multiple discharge lamp that rated voltage (rated power) is different, no matter the discharge lamp kind how, all can detect abnormalities such as end of lifetime, stop the action of inverter circuit safely.Therefore the optimal circuit constant of holding circuit H100 needn't be selected at every kind of discharge lamp, thereby part kind and the stock control machine that is used to produce starting device can be reduced.
In addition, because inverter circuit is the half-bridge circuit with two switch elements, thereby can be set at ball bearing made using.
And, among present embodiment, be the situation of two pipes though only introduced discharge lamp, when only being one, discharge lamp do not mentionlet alone certainly, even obviously can use equally more than three.
(execution mode 2)
Fig. 5 is the circuit diagram that the discharge lamp starting device of expression embodiments of the present invention 2 constitutes, and Fig. 6 is the action specification figure of discharge lamp starting device.
Among Fig. 5, have the element and the same label sign of inscape employing of same purpose with Fig. 2 of execution mode 1, and omit its explanation.Present embodiment is among Fig. 1 of execution mode 1, Fig. 2, has increased over-voltage detection circuit Vov100, and part has changed the formation of decision circuit C100.
Among Fig. 5, the over-voltage detection circuit Vov100 of overvoltage that detects discharge lamp voltage is by the time in parallel with the capacitor 53 of ± P testing circuit P300, the resistance 80,81 of series connection and the capacitor 82 in parallel with resistance 80 constitute, and the action that its output voltage forms decision circuit C100 stops input voltage Vsi2.
Among decision circuit C100, the resistance 80 of having set up negative electrode and over-voltage detection circuit Vov100 is connected Zener (voltage stabilizing) diode 83 that non-inverting input of anode and comparator 74 is connected with 81 contact.
Introduce the action of embodiments of the present invention 2 below with reference to Fig. 1, Fig. 5, Fig. 6.Among Fig. 6, corresponding with the state of the elapsed time t of discharge lamp 7,11, (a) stops input voltage (Vsi2) for action for V54 (Vsi1), (d) for V58, (c) for V53, (b) waveform is shown.Pattern 1 is identical with Fig. 4 of execution mode 1 to mode 3, omits its explanation.Blind crack appears in a certain side that pattern 4 illustrates in the discharge lamp 7,11, and micro-air enters discharge lamp inside, though perhaps discharge lamp is normal because of ambient temperature is low excessively, can't enter the situations such as the inoperative state of discharge lamp of regular picture state.
Among Fig. 1, DC power supply is promptly passed through oscillation control circuit 4 with high-frequency current driven switch element 2 and 3 once input, starts until discharge lamp.
Obviously, here, about in discharge lamp 7,11, having the discharging substance of a side filament to consume at least, be in the action of the pattern 1 to 3 in discharge lamp latter stage, because of identical with execution mode 1, the vibration of inverter circuit stops, and its state can continue until and cuts off till the DC power supply 1, so omit its explanation.
Introduce pattern 4 below.Pattern 4 be from time t4 during shown in the t5, when time t41, discharge lamp is because of reason such as cracking, its discharge voltage positive and negative half period is basic identical, shown in Fig. 6 (a) and (b), the voltage of the voltage V53 of capacitor 53 and the voltage V58 of capacitor 58, its positive and negative half period is basic identical, but compare during with regular picture, all want high.Under this state, the electric current that flows into switch element 2,3 wants big naturally, in order to prevent to damage circuit, must stop the action of inverter circuit, yet shown in Fig. 6 (c), it is zero that action stops input voltage (Vsi1), and the pattern 1 during with discharge lamp 7,11 regular events is identical, the action of decision circuit C100 stops output voltage V so and also is low level (zero), can't stop the action of inverter circuit with this voltage.
Yet, among over-voltage detection circuit Vov100, the voltage that to obtain at the capacitor 53 of ± P testing circuit P300 is with resistance 81,80 and capacitor 82 integrations, stop input voltage (Vsi2) input C100 as action, when action stops input voltage (Vsi2) greater than the value V1 that predesignates, if set the value of Zener diode 83, make the output of comparator 74 become high level, even then when the voltage positive and negative half period of discharge lamp 7 is basic identical, also can stop the vibration of inverter circuit by low level.
That is to say, shown in Fig. 6 (e), at t42, when the action of the output voltage of over-voltage detection circuit Vov100 stops voltage V1 that input voltage (Vsi2) predesignates greater than Zener diode 83, the output of the comparator 74 of decision circuit 100 becomes high level by low level, and the action of decision circuit C100 output stops output voltage V so and become high level shown in Fig. 5 (d).
And, if become high level because action stops output voltage V so, then the grid of the thyratron 36 of holding circuit H100 becomes high level, thyratron 36 becomes the ON state, oscillation control circuit 4 stops to switch element 2,3 outputting drive voltages, inverter circuit becomes and stops (t43), and discharge lamp 7 and 11 extinguishes, and this state will last till till the cut-out DC power supply 1 always.
At this, when the positive and negative half period of the voltage of discharge lamp basic identical, it is just when normal big, and the voltage V1 that makes duration T 1 (t41 is to t42) before the inverter circuit action stops and the action of this moment stop input voltage (Vsi2) can be stipulated by the constant of over-voltage detection circuit Vov100 and Zener diode 83.For example, the capability value of capacitor 82 is under the situation of zero (capacitor 82 is identical with removing), the T1 vanishing, when the voltage of discharge lamp during greater than predetermined value, but non-time delay the action of inverter circuit is stopped.
As above-mentioned, according to embodiments of the present invention 2, owing to be action to be stopped input voltage Vsi1, Vsi2 judge discharge lamp as the input voltage of decision circuit C100 voltage with the positive and negative unbalanced ± P testing circuit P300 of the discharge voltage that detects discharge lamp and two kinds of detections of the over-voltage detection circuit Vov100 voltage that detects the discharge voltage height, no matter thereby the kind of discharge lamp how, the output voltage V so of decision circuit C100, if discharge lamp normally then be low level, if a certain side's discharge lamp occurs unusual, promptly become high level.
Therefore, when promptly using same starting device to start the discharge lamp that multiple rated current is basic identical, rated voltage (rated power) is different,, stop the action of inverter circuit no matter kind that also can discharge lamp how, detects the abnormality of end of lifetime.
Therefore the optimal circuit constant of holding circuit H100 needn't be selected at the kind of discharge lamp, thereby part kind and the stock control machine that is used to produce starting device can be reduced.In addition, because the output voltage that has over-voltage detection circuit Vov100 simultaneously concurrently with the same comparator 74 of same decision circuit C100 is judged the decision-making function with the output voltage of ± P testing circuit P300, thereby has circuit miniaturization, effect that can cheap production.
In addition, the situation when only having introduced discharge lamp above and being two pipes, but during 1 tubes from not mentionleting alone, even three pipes obviously can use when above equally.In addition, ± P testing circuit P300, over-voltage detection circuit Vov100, decision circuit C100 are not limited to above formation, and other structure with same function can certainly be used.In addition, over-voltage detection circuit Vov100 is with the voltage integrating meter of the capacitor 53 of the peak value of the positive half period of discharge lamp, through Zener diode 83, judge its output Vsi2 with comparator 74, but also can be with the voltage integrating meter of the capacitor 58 of the peak value of the negative half-cycle of discharge lamp, through Zener diode, judge this value with comparator 78, also can obtain same effect.
(execution mode 3)
Fig. 7 is the circuit diagram that the discharge lamp starting device of expression embodiments of the present invention 3 constitutes.Have the element and the same label sign of inscape employing of equivalent effect among the figure with aforesaid way, and omit its explanation.Fig. 7 has replaced capacitor 23,24 for the capacitor 20,21 among the Fig. 1 that has replaced execution mode 1 with resistance 20a, 21a with resistance 23a, 24a.
Among the discharge lamp load circuits L100 of this figure, the voltage of discharge lamp 7 is by resistance 20a, 21a dividing potential drop, capacitor 53, peak electricity V53 charging by positive half period, capacitor 58 is identical with the embodiment of the Fig. 1 that represents embodiments of the present invention by the situation of the crest voltage V58 of negative half-cycle charging.That is to say, the absolute value of V53 and V58 is poor as if having, the voltage V54 that promptly can be used as capacitor 54 detects the voltage corresponding with this difference, and when above-mentioned V54 was higher or lower than the value of predesignating, the effect by decision circuit C100 can make the action of inverter circuit stop.
Among present embodiment 3, owing to the capacitor of having replaced with resistance 20a, 21a among the Fig. 1 that represents embodiments of the present invention 20,21, even thereby the voltage of discharge lamp is because of the reason generation instantaneous variation such as variation in voltage of DC power supply 1, capacitor 53,58 still, available by these capacitors constant and the integral constant charging of the constant decision of resistance 20a, 21a.That is to say, voltage V53, the V58 of capacitor 53,58 continues under the situation of generation at the voltage of discharge lamp, Dui Ying generating positive and negative voltage is when the voltage instantaneous of discharge lamp changes with it, can detect time-delay voltage, thereby have the effect that can prevent the misoperation corresponding with the instantaneous variation of DC power supply 1 with its integration.Though above only introduced among discharge lamp load circuits L100, capacitor 20,21 is replaced with the situation of resistance 20a, 21a, obviously, also have identical effect when capacitor 23,24 is replaced with resistance 23a, 24a.
As mentioned above, according to embodiments of the present invention 3, because with the capacitors in series circuit of resistance replacement with discharge lamp parallel, and then the positive and negative unbalanced ± P testing circuit P300 that will detect the discharge voltage of discharge lamp detects voltage is judged discharge lamp as the input voltage of decision circuit C100 voltage with two kinds of the over-voltage detection circuit Vov100 that detects the discharge voltage height, no matter thereby the kind of discharge lamp how, if certain discharge lamp occurs unusual, promptly become high level.Therefore, promptly use under the situation of the basic identical and multiple discharge lamp that rated voltage (rated power) is different of same starting device starting rated current, no matter can discharge lamp be which kind of class all can detect abnormalities such as end of lifetime still, stop the action of inverter circuit.In addition, also can prevent reasons such as moment property change, the misoperation that produces when the voltage of discharge lamp changes because of DC power supply 1.Therefore the optimal circuit constant of holding circuit H100 needn't be selected at every kind of discharge lamp, the part kind and the stock control machine that are used to produce starting device can be reduced.
Disposing DC power supply; The direct current that this DC power supply is provided is transformed to the inverter circuit of high-frequency current; Utilize the discharge lamp load circuits of the high-frequency current discharge at starting lamp of this inverter circuit generation; Make according to the voltage of above-mentioned discharge lamp among the discharge lamp starting device of the protective circuit that above-mentioned inverter stops, because above-mentioned protective circuit has disposed the positive and negative peak detection circuit that peak value with the discharge voltage of positive and negative half period separately of above-mentioned discharge lamp is exported after with the impedance component dividing potential drop; Output makes the decision circuit of the stop signal of the above-mentioned inverter circuit failure of oscillations when the output voltage of this positive and negative peak detection circuit surpasses the scope of predesignating; And the above-mentioned stop signal of utilizing this decision circuit is when stopping the vibration of above-mentioned inverter circuit, the holding circuit that halted state is kept; No matter thereby the kind of discharge lamp how, the output voltage V so of decision circuit C100 just often is a low level at discharge lamp, if certain discharge lamp is in end of lifetime, then becomes high level.Therefore, even under situation with the same starting device starting multiple discharge lamp that rated current is basic identical, rated voltage (rated power) is different, no matter the kind of discharge lamp is how, all can detect abnormal conditions such as end of lifetime, stop the action of inverter circuit.
Number in the figure:
1, DC power supply, 2,3 switch elements, 7,11, discharge lamp, 20,21,23,24, capacitor, 20a, 21a, 23a, 24a, resistance, 36, thyratron, 38, Zener (voltage stabilizing) diode, 50,51,55,56, diode, 52,57, resistance, 53,54,58, capacitor, C100, decision circuit, H100, holding circuit, L100, L110, discharge lamp load circuits, P300, ± the P testing circuit, Vsi1, Vsi2, action stop input voltage, and Vso, action stop output voltage.
Claims (4)
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 of high-frequency current; Utilize the discharge lamp load circuits of the high-frequency current discharge at starting lamp that this inverter circuit provides; According to the protective circuit that the voltage of above-mentioned discharge lamp makes above-mentioned inverter stop to move, it is characterized in that: above-mentioned protective circuit comprises: with the peak value of the discharge voltage of positive and negative half period separately of the above-mentioned discharge lamp positive and negative peak detection circuit with output after the impedance component dividing potential drop; Output makes the decision circuit of the stop signal that the vibration of above-mentioned inverter circuit stops when the output voltage of this positive and negative peak detection circuit exceeds the scope of predesignating; When utilizing the above-mentioned stop signal of this decision circuit that the vibration of above-mentioned inverter circuit is stopped, the holding circuit that halted 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 the inverter circuit of high-frequency current; Utilize the discharge lamp load circuits of the high-frequency current discharge at starting lamp that this inverter circuit provides; According to the protective circuit that the voltage of above-mentioned discharge lamp makes above-mentioned inverter stop to move, it is characterized in that: above-mentioned protective circuit comprises: with the peak value of the positive and negative half period discharge voltage separately of the above-mentioned discharge lamp positive and negative peak detection circuit with output after the impedance component dividing potential drop; At least one side's of the above-mentioned positive negative peak that detects according to the above-mentioned peak detector with this positive and negative peak detection circuit voltage detects the superpotential over-voltage detection circuit of above-mentioned discharge lamp; When the output voltage of above-mentioned positive and negative peak detection circuit or above-mentioned over-voltage detection circuit surpassed the scope of predesignating, output made the decision circuit of the stop signal that the vibration of above-mentioned inverter circuit stops; 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.
3, discharge lamp starting device according to claim 1 and 2 is characterized in that: this inverter circuit is the half-bridge circuit that two switch elements are arranged that has DC power supply and the direct current that this DC power supply provides is transformed to high-frequency current.
4, according to each described discharge lamp starting device of claim 1 to 3, it is characterized in that: the peak detector of positive and negative peak detection circuit comprises: the resistance that divides the pressure discharge lamp both end voltage; And the capacitor of the positive and negative voltage charging separately after diode is with dividing potential drop.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003039913 | 2003-02-18 | ||
| JP039913/2003 | 2003-02-18 |
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| CN1523945A true CN1523945A (en) | 2004-08-25 |
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| CNA031493327A Pending CN1523945A (en) | 2003-02-18 | 2003-06-27 | Discharge lamp starting apparatus |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1925713B (en) * | 2005-08-31 | 2010-09-08 | 三菱电机株式会社 | Discharge lamp lighting device |
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2003
- 2003-06-27 CN CNA031493327A patent/CN1523945A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1925713B (en) * | 2005-08-31 | 2010-09-08 | 三菱电机株式会社 | Discharge lamp lighting device |
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