JPH06251888A - Discharge lamp lighting device - Google Patents

Abstract

PURPOSE:To make the confirmation of a light output change difficult and start lighting with less feeling of physical disorder by smoothly switching the light output after discharge start when dimming starting is conducted at lamp starting. CONSTITUTION:The control circuit of a lighting device is formed of a counter 16 for changing the data for output frequency generation; clocks a17, b18, c19 for setting the timing for changing the data; a ring counter 21 for taking the frequency data from the counter 16 to generate an output frequency; a frequency conformation judging circuit 22 for setting the switching timing of the output frequency; a frequency data 23 for setting the output frequency switching timing; a frequency generating clock 24; and a clock 20 for stopping the counter 16. According to such a constitution, the time from preheating end to steady lighting frequency is set by clocks a17-c19 and the circuit 22, and after preheating is finished, the frequency generating data to the counter 21 is changed, and when the steady state is attained, the counter 16 is stopped.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discharge lamp lighting device, and more particularly to lighting / starting and protection thereof.

[0002]

2. Description of the Related Art As a conventional discharge lamp lighting device, a conventional S.I. 5-7 General operation is introduced in household inverter application equipment (lighting equipment). Further, for example, Japanese Patent Laid-Open No. 140071/1992
The one disclosed in the publication is proposed. FIG. 19 is a circuit diagram of the discharge lamp lighting device disclosed in the publication. In FIG. 19, 1 is an AC power source serving as an energy supply source, 2 is a full-wave rectifier, 3 is a smoothing capacitor, 4 is an inverter circuit, and the DC power obtained by the full-wave rectifier 2 and the smoothing capacitor 3 is of a predetermined frequency. Convert to AC power. The inverter 4 is composed of a switching element 7 and a switching element 8 such as a transistor, a diode 5 and a diode 6. Switching element 7 and switching element 8
Operate alternately on / off. A choke coil 9 limits the current flowing through the discharge lamp 10. Reference numerals 10a and 10b are discharge electrodes of the discharge lamp 10 and are called filaments or simply electrodes. By energizing the filaments 10a and 10b before the discharge lamp 10 discharges, the filaments 10a and 10b themselves become high in temperature and electrons are easily emitted. Like This operation is called a filament preheating operation.
Reference numeral 12 denotes a capacitor, which is charged and discharged by the current flowing from the inverter 4 to the choke coil 9 and the discharge lamp 10. The capacitor 12 is charged when the switching element 7 is ON.
A charging current flows through the capacitor 12, and the capacitor 12 is discharged when the switching element 8 is ON. Therefore, an alternating current flows through the choke coil 9, the discharge lamp 10 and the capacitor 11. Reference numeral 14 is an oscillating circuit for generating a signal for driving the switching elements 7 and 8, and 15 is a control circuit for controlling oscillation / stopping and oscillating frequency of the oscillation circuit 14.

The operation of the conventional discharge lamp lighting device will be described with reference to the timing diagram of FIG. 20, the sequence diagram of FIG. 21, and the characteristic diagram of FIG. 20A and 20B are diagrams showing ON / OFF operations of the switching element 7 and the switching element 8. FIG. 20A shows the switching element 7 and FIG. 20B shows the operation of the switching element 8.

As is apparent from FIG. 20, the switching element 7 and the switching element 8 are alternately turned on and off repeatedly, and a time Td is provided after the switching element 7 is turned on until the switching element 8 is turned on. After the switching element 8 is turned on, a time Td is provided until the switching element 7 is turned on. Also,
The ON / OFF repetition cycle T is determined by the oscillation frequency of the oscillation circuit 14, and the drive frequency f of the inverter 4 is 1 / T. FIG. 21 is a diagram showing a control sequence of the control circuit 14. The oscillation frequency of the oscillation circuit 14 is controlled to f1 during the filament preheating period and f2 during the lighting period.

On the other hand, in the conventional discharge lamp lighting device shown in FIG. 19, a choke coil 9 and a capacitor 11 form a series resonance circuit, and a high voltage is generated at both ends of the capacitor 11 near the resonance frequency. FIG. 22 shows a voltage characteristic generated in the capacitor 11 at the resonance frequency f0. Since the oscillation frequency, that is, the inverter frequency is controlled to f1 during the filament preheating period, the voltage V1 is generated in the capacitor 11, but the voltage V1 is set to a voltage insufficient to discharge the discharge lamp 10. At this time, the filaments 10a, 10
An electric current flows through b through the choke coil 9 to preheat the filaments 10a and 10b. When the preheating period ends, the control circuit 15 commands the oscillation circuit 14 to set the oscillation frequency to f2. When the inverter frequency becomes f2, the voltage V2 is generated from the capacitor 11. Since the voltage V2 is set to a voltage sufficient for discharging the discharge lamp 10, the discharge lamp 10 starts discharging. Once the discharge lamp 10 starts to discharge, the equivalent impedance of the discharge lamp 10 decreases, so that the resonance characteristic of the resonance circuit formed by the choke coil 9 and the capacitor 11 changes and the discharge lamp 10 changes.
A current limited by the choke coil 9 flows through the.

[0006]

Since the conventional discharge lamp lighting device is constructed as described above, it has the following problems. (1) Since a high voltage is applied to the discharge of the discharge lamp after the preheating period ends, the current flowing through the choke coil changes rapidly and an excessive surge voltage is applied to the switching element, so a switching element protection circuit is required. And (2) It is dangerous because the discharge lamp fails and cannot be discharged, or high voltage continues to be generated even when the discharge lamp is not connected. (3) Since the discharge lamp is driven at a preset inverter frequency after lighting, the discharge current of the discharge lamp varies due to manufacturing variation of the choke coil, and a light difference appears between products.

(4) Since the power supply has to be turned on / off to turn on / off the discharge lamp, a switch having a large current capacity or a relay having a large contact current is required.

(5) Since the current flowing through the discharge lamp after lighting is constant, the light output is fixed and the light output cannot be adjusted.

[0009]

A discharge lamp lighting device according to claim 1 is an inverter device for converting electric power supplied from a DC power source into high frequency power, a control circuit for controlling the operation of the inverter device, and the inverter device. An LC series circuit including an inductive element and a capacitive element, and a discharge lamp that forms a load circuit together with the LC series circuit, and means for preheating the electrodes of the discharge lamp when starting and lighting the discharge lamp. , Means for applying high voltage to the discharge lamp to start discharge,
In a lighting device having an abnormality detection protection means for protecting an inverter when an abnormality occurs in a discharge lamp, the discharge lamp is started and discharge is started by changing the output frequency of the inverter, and the frequency when the discharge lamp is preheated. It is provided with a means for making the time interval of frequency change at the time of the discharge start operation longer than the time interval of change.

A discharge lamp lighting device according to a second aspect of the present invention is provided with a means for setting a time from the end of preheating operation at the time of starting and lighting of the discharge lamp until the steady lighting to 200 [mS] or more and 1000 [mS] or less. The discharge lamp lighting device according to claim 1.

At the time of starting and lighting the discharge lamp of claim 3, the time from the end of the preheating operation to the application of a sufficient dischargeable voltage is defined as T1, and after the reliable discharge voltage is applied, the steady lighting frequency is reached. 2. The discharge lamp lighting device according to claim 1, further comprising means for setting the time T2 to be T2 and the relationship between T1 and T2 is 10T1>T2> T1.

According to another aspect of the discharge lamp lighting device of the present invention, an inverter device for converting electric power supplied from a DC power source into high frequency power, a control circuit for controlling the operation of the inverter device, an inductive element connected to the inverter device, and It has an LC series circuit composed of a capacitive element and a discharge lamp that constitutes a load circuit together with this LC series circuit.
It is equipped with means for preheating the electrodes of the discharge lamp at the time of lighting, means for applying high voltage to the discharge lamp to start discharge, and abnormality detection protection means for protecting the inverter when the discharge lamp has an abnormality. In the lighting device that changes the output frequency of the inverter, after the preheating of the discharge lamp is completed, a sufficient voltage (discharge voltage) is applied to start the discharge to maintain T4 for a predetermined time, and the abnormality is detected by the signal from the lamp abnormality detecting means. In this case, the discharge voltage is further applied for the time T4 or longer, and if the same, thereafter, the sequence is repeated.

According to another aspect of the discharge lamp lighting device of the present invention, an inverter device for converting electric power supplied from a DC power source into high frequency power, a control circuit for controlling the operation of the inverter device, an inductive element connected to the inverter device, and It has an LC series circuit composed of a capacitive element and a discharge lamp that constitutes a load circuit together with this LC series circuit.
In a discharge lamp lighting device comprising means for preheating the electrodes of the discharge lamp at the time of lighting, means for applying high voltage to the discharge lamp to start discharge, and abnormality detection protection means for protecting the inverter when the discharge lamp is abnormal, It is provided with means for superimposing a DC voltage on the load voltage.

A discharge lamp lighting device according to a sixth aspect of the present invention is an inverter device for converting electric power supplied from a DC power source into high frequency power, a control circuit for controlling the inverter device, an inductive element connected to the inverter device, and a capacitive element. An LC series circuit composed of elements and a discharge lamp that constitutes a load circuit together with this LC series circuit, and means for preheating the electrodes of the discharge lamp when starting and lighting this discharge lamp, and applying a high voltage to the discharge lamp. In a discharge lamp lighting device comprising means for starting discharge by means of a discharge lamp and an abnormality detection protection means for protecting the inverter when the discharge lamp is abnormal, the abnormality detection protection means detects a voltage according to the load voltage, It is provided with means for protecting the inverter when the rate of change of the detected voltage changes abruptly by using a configuration composed of different integrating circuits 1 and 2 and an operation amplifier circuit. That.

A discharge lamp lighting device according to a seventh aspect of the present invention is an inverter device for converting electric power supplied from a DC power source into high frequency power, a control circuit for controlling the operation of the inverter device, an inductive element connected to the inverter device, and Discharge lamp lighting including an LC series circuit including a capacitive element and a discharge lamp that forms a load circuit together with the LC series circuit, and including load detection means and abnormality detection protection means for protecting the inverter when the discharge lamp is abnormal In the device, the control circuit is provided with an input means for stopping the operation of the inverter by a signal from the load detecting means, and the output side of the load detecting means is connected with a switch for switching the output signal state to turn on the light. , Means for turning off the light.

The discharge lamp lighting device according to claim 8 further comprises means for masking the output signal of the load detecting means provided in the control circuit while the inverter drive signal is being generated, and for always judging that the load is present. It is an electric lighting device.

The discharge lamp lighting device according to claim 9 is further provided with means for masking the output signal of the load detecting means provided in the control circuit until the lighting after the end of preheating and determining the presence of a load. It is a discharge lamp lighting device.

A discharge lamp lighting device according to a tenth aspect of the present invention includes a commercial AC power source and a rectifying circuit for rectifying the commercial AC power source, a DC voltage conversion circuit capable of varying an output voltage with the power rectified by the rectifying circuit as an input, and the DC voltage. An LC circuit including an inverter circuit for converting DC power from the conversion circuit into high frequency power, a control circuit for controlling the operation of the inverter circuit, and an inductive element and a capacitive element connected to the inverter circuit.
A series circuit and a discharge lamp that forms a load circuit together with the LC series circuit, and means for preheating the electrodes of the discharge lamp at the time of starting and lighting the discharge lamp, and means for applying a high voltage to the discharge lamp for discharging. In a discharge lamp lighting device equipped with an abnormality detection protection means for protecting the inverter when the discharge lamp is abnormal and a load detection means for detecting the presence or absence of the discharge lamp, the inverter circuit and the DC It is provided with means for stopping the operation of the voltage conversion circuit.

In the discharge lamp lighting device according to the eleventh aspect, by switching the output signal state of the load detecting means, the operation of the inverter device and the operation of the DC voltage conversion circuit are switched to an operating / stopping state to turn on / off the discharge lamp. The discharge lamp lighting device according to claim 10, further comprising means.

A discharge lamp lighting device according to a twelfth aspect of the present invention is an inverter device for converting electric power supplied from a DC power source into high frequency power, a control circuit for controlling the operation of the inverter device, an inductive element connected to the inverter device, and It has an LC series circuit composed of a capacitive element and a discharge lamp that constitutes a load circuit together with this LC series circuit, a means for preheating the electrodes of the discharge lamp when starting and lighting this discharge lamp, and a high voltage to the discharge lamp. In a discharge lamp lighting device comprising means for applying and discharging, and abnormality detection protection means for protecting the inverter when the discharge lamp is abnormal, a means for storing an abnormal state in the control circuit when the inverter stops It was done.

A discharge lamp lighting device according to a thirteenth aspect of the present invention is an inverter device for converting electric power supplied from a DC power source into high frequency power, a control circuit for controlling the operation of the inverter device, an inductive element connected to the inverter device, and It has an LC series circuit composed of a capacitive element and a discharge lamp that constitutes a load circuit together with this LC series circuit, a means for preheating the electrodes of the discharge lamp when starting and lighting this discharge lamp, and a high voltage to the discharge lamp. In a discharge lamp lighting device equipped with a means for applying and discharging, and an abnormality detection protection means for protecting the inverter in the event of a discharge lamp abnormality, a means capable of setting a high voltage to be applied to start discharge of the discharge lamp is provided. It is equipped.

[0022]

The control circuit of the discharge lamp lighting device according to claim 1 smoothly applies a high voltage for starting the lamp discharge at the time of starting the lamp.

The control circuit of the discharge lamp lighting device according to the second aspect of the present invention smoothly switches the light output after the start of the lamp discharge at the time of starting the lamp and when performing the dimming start.

The control circuit of the discharge lamp lighting device according to the third aspect of the present invention smoothly switches the light output after the start of the lamp discharge at the time of starting the lamp and when performing the dimming start.

The control circuit of the discharge lamp lighting device according to claim 4 prevents the inverter from being damaged due to an abnormality in the lamp when the lamp is started, and also prevents the high voltage from being applied to the lamp for an unnecessarily long time.

The superposing means of the control circuit in the discharge lamp lighting device according to the fifth aspect surely detects the abnormality when the lamp is abnormal.

The abnormality detection protection means of the control circuit in the discharge lamp lighting device according to the sixth aspect surely detects the abnormality when the lamp is abnormal.

The load detecting means of the discharge lamp lighting device according to claim 7 turns on and off the lamp without using a high-voltage cutoff switch such as a relay.

The mask means of the control circuit in the discharge lamp lighting device according to claim 8 obtains a stable lighting state by preventing the presence / absence detection signal of the discharge lamp from being influenced by the state of the lamp.

In the discharge lamp lighting device according to the ninth aspect, the pre-heating maximum lighting mask means of the control circuit obtains a stable lighting state by preventing the presence / absence detection signal of the discharge lamp from being influenced by the state of the lamp.

In the discharge lamp lighting device according to the tenth aspect, the operation stopping means of the inverter circuit and the DC voltage converting circuit stops the operation of the inverter circuit and the DC voltage converting circuit as a protection in case of a lamp failure or no load. No power is supplied and no voltage is applied to the inverter.

The operation / stop state switching means of the inverter device and the DC voltage conversion circuit in the discharge lamp lighting device according to claim 11 stops the operation of the inverter circuit and the DC voltage conversion circuit as protection in the event of a lamp failure or no load. No electric power is supplied to the load, no voltage is applied to the inverter, and the DC voltage conversion circuit starts the operation when the discharge lamp is lit.

The abnormal state storage means in the discharge lamp lighting device according to the twelfth aspect is protected by a lamp abnormality or the like, and it is possible to immediately determine what kind of abnormality is protected even if the operation of the inverter is stopped.

The high voltage setting means of the control circuit in the discharge lamp lighting device according to the thirteenth aspect absorbs variations in the LC series circuit including the inductive element and the capacitive element connected to the inverter device.

[0035]

【Example】

Example 1. The structure of the discharge lamp lighting device according to the first embodiment of the present invention is the same as that of the conventional example shown in FIG. The first embodiment of the present invention is one in which the control circuit 14 shown in the conventional example applies a high voltage necessary for starting the discharge at a gentle voltage change rate at the time of starting the discharge lamp. By stipulating the frequency change and time until reaching the lighting frequency, in order to eliminate the sudden change in the light output that was used in the past as in the case of dimming start, the change in light output is not noticeable so that the start can be performed smoothly. It was done.

FIG. 1 is a block diagram of a control circuit showing an example embodying the first embodiment, and FIGS. 2 to 4 are operation diagrams showing the operation. The block diagram shows a counter 16 that changes data for generating an output frequency by a predetermined clock, and a clock a17, a clock b18, and a clock c that set time timings for changing data for generating the frequency.
19, a ring counter 21 that takes in frequency data output from the counter 16 and generates an output frequency,
Frequency coincidence determination circuit 22 for setting output frequency switching time timing, output frequency switching timing setting frequency data 23, frequency generation clock 2
4, counter 16 stop clock 20. This operation will be described with reference to FIGS.

As shown in FIG. 2, after the end of preheating, the time until the steady lighting frequency is reached is set by clocks a to c17 to 19.
And the frequency coincidence determination circuit 22 is performed. After the preheating, the counter 16 is incremented or decremented by the clock a, b, or c from the preheating frequency to change the frequency generation data to the ring counter 21 which generates the frequency. When the steady lighting frequency is reached, the counter 16 is stopped by the frequency coincidence determination circuit 22 and thereafter oscillation is performed at the steady lighting frequency (fixed frequency).

In order to change the time interval until the steady lighting frequency is reached after the end of preheating, the counter 16 is first operated with the clock a17, and when a certain predetermined frequency f2 is reached, the frequency coincidence determination circuit 22 switches to the clock b18, The counter 16 is operated at b18. When the steady lighting frequency f3 is reached, similarly, the counter 16 is stopped by the frequency coincidence determination circuit 22 and oscillation at the steady lighting frequency is performed thereafter. Let f2 be the frequency at which the discharge is reliable, the time to reach f2 is T1, and the time to reach f3 from f2 is T
By smoothing the frequency change after discharge while maintaining the relationship of T1 <T2 <10T1 as 2, the light output does not change even when the relationship of f2> f3 at the time of dimming lighting is satisfied, and a feeling of strangeness is felt. It is possible to start without any trouble. In addition, when the range of T2 is expressed by a concrete numerical value, 200 [mS] or more 100
The result is that the discharge becomes smooth when the temperature is 0 [mS] or less and the change of the light output is very small.

As shown in FIG. 3, when the preheating frequency is not fixed, a predetermined time is set as the preheating time, and the preheating is finished when the predetermined time has elapsed. The subsequent operation is similar to that shown in FIG.

FIG. 4 is an operation diagram when the steady lighting frequency after preheating is divided into three stages. Clock a
When the counter 16 is operated at 17, and the frequency f1 is reached, the frequency coincidence determination circuit 22 switches to the clock b18 and the counter 16 is operated, and when the frequency f2 is reached, the frequency coincidence determination circuit switches to the clock 3 and the counter 16 is operated. When the steady frequency f3 is reached, the counter 1
6 Stop and then oscillate at the steady frequency. By changing (longing) the frequency change time until the frequency reaches f2 with f2 as the reliable discharge frequency, it is possible to moderate the change in the voltage applied to the lamp immediately before the start of discharge of the lamp. Further, if the frequency change (from f2 to f3) after discharge is within the above time, the light output changes smoothly at the time of starting dimming.

Example 2. FIG. 5 is a configuration diagram schematically showing the entire discharge lamp lighting device according to the second embodiment of the present invention. The basic operation is the same as that of the conventional discharge lamp lighting device. Figure 1
The conventional discharge lamp lighting device shown in FIG. 9 and the embodiment shown in FIG. 5 have exactly the same operation although the connection position of the capacitor 12 is different. In this embodiment, the inverter detects the voltage from the discharge lamp 10 and facilitates the explanation. The capacitor 12 is connected to the 4 side. In FIG. 5, reference numeral 25 is a discharge lamp abnormality detection circuit, which comprises a lamp voltage detection circuit 26 and a comparison circuit 27. The lamp voltage detection circuit 26 inputs the discharge lamp voltage,
The maximum value of the input voltage is detected from the ground potential shown in FIG. The discharge lamp voltage has a substantially sinusoidal waveform synchronized with the frequency of the inverter 4. Reference numeral 27 is a comparison circuit, which operates to stop the oscillation of the oscillation circuit 15 via the control circuit 14 by comparing the lamp voltage detected by the lamp voltage detection circuit 26 with a preset voltage value.

FIG. 6 is an operation diagram of the second embodiment, and FIG. 7 is a second embodiment.
3 is a flowchart of a control circuit showing the operation of FIG. The basic operation of the second embodiment is equivalent to the operation shown in the conventional example. In the second embodiment, the operation of the second embodiment will be described below with reference to FIGS. 6 and 7. In FIG. 6, the frequency f1 (discharging frequency) at which a certain voltage is applied after the end of preheating is set, and if the abnormality is determined by the signal from the lamp abnormality detection circuit at the time (t1) when the discharge frequency f1 is reached, it is determined as predetermined. The discharge frequency is maintained at the time T, and after the time T is up (t2), when the abnormality is again determined by the signal from the abnormality detection circuit, the discharge frequency is further maintained at the time T (up to t3). When it is determined to be normal, the steady lighting frequency is smoothly shifted to the steady lighting state. After the time T is maintained a total of three times (t4), if an abnormality is determined by the signal from the abnormality detection circuit, the oscillation is stopped, and if the abnormality is determined normally, the steady lighting state is entered.

FIG. 7 is a flow chart of this operation. After the power is turned on, the preheat frequency 28 is maintained by the timers 1 and 29 for a predetermined time, and after the preheat is completed, the discharge frequency 3 is set by the frequency sweep 30.
It reaches 1. At the time when the discharge frequency is reached, the initial value (1) (0) is set in the counter 32, and when the normal judgment 33 is made by the signal from the lamp abnormality detection circuit 25, the steady lighting frequency 3
It reaches 7. If it is determined 33, the timer 2 or 34
When the timers 2 and 34 count up, the counter 32 is incremented 35. If the counter value is not 3, the determination is again made based on the signal from the lamp abnormality detection circuit 36, and if the abnormality determination 33, the counter value is incremented 35 and the timers 2 and 34 are operated.
If the determination is normal, the steady lighting frequency 37 is reached. When the counter value reaches 3, the oscillation stops 38 at 36.

Example 3. FIG. 8 is a configuration diagram schematically showing the entire discharge lamp lighting device according to the third embodiment of the present invention. The basic operation is the same as that of the conventional discharge lamp lighting device. Figure 1
The conventional discharge lamp lighting device shown in FIG. 9 and the embodiment shown in FIG. 8 have exactly the same operation although the connection position of the capacitor 12 is different. In this embodiment, the voltage is detected from the discharge lamp 10 and the inverter is used for ease of explanation. The capacitor 12 is connected to the 4 side. In FIG. 8, 39 is a DC power supply, which may divide the voltage of the capacitor 3 and apply it to the connection point between the capacitor 12 and the choke coil. Peak voltage detection circuit 4
0 inputs the discharge lamp voltage, and detects the maximum value of the input voltage from the ground potential shown in FIG. The discharge lamp voltage has a substantially sinusoidal waveform synchronized with the frequency of the inverter 4. Four
Reference numeral 1 is a comparison circuit, which operates to compare the peak voltage Vp detected by the peak voltage detection circuit 40 with a preset voltage value and stop the oscillation of the oscillation circuit 15 via the control circuit 14 according to the result.

On the other hand, the discharge lamp becomes unstable at the end of its life, and, for example, the discharge lamp voltage becomes abnormally high or a one-side discharge state (rectification lighting) often occurs. If the discharge is continued in this state, that is, if the discharge lamp lighting device is operated, stress on the inverter side increases, which may cause a failure of the inverter. The third embodiment of the present invention is intended to stop the inverter before such a state occurs, and basically detects the discharge lamp voltage to detect the above-mentioned abnormality.
However, since the discharge lamp voltage varies depending on the abnormal state, the present invention is devised so as to cope with any abnormal state.

Next, the operation will be described with reference to the waveform chart shown in FIG. 9 (1) shows the discharge lamp voltage input to the peak voltage detection circuit 40 when the discharge lamp 10 is normally lit. The discharge lamp voltage is the DC voltage 39
Is superimposed, and the peak voltage detection circuit 40 outputs the value of VP1 shown in the figure. The comparator circuit 41 sets a normal voltage range, and determines that the peak voltage is normal when the peak voltage falls within the range of the minimum voltage value V1 and the maximum voltage value V2. That is, normal lighting is determined only when V1 <peak voltage <V2.

FIG. 9B is a waveform diagram when the discharge lamp voltage abnormally rises in positive and negative directions. The peak voltage VP2 is the maximum voltage value V2.
Because of the above, the comparison circuit 41 determines that there is an abnormality, and the control circuit 1
An abnormal signal is output to 4. (3) is an input waveform of the peak voltage detection circuit 40 at the time of rectification lighting, and the case where the rectification direction is on the minus side with respect to the ground potential. At this time, since the peak voltage VP3 is V1 or less, it is determined to be abnormal.
Similarly, (4) is a peak voltage detection circuit 4 when rectified and lit.
This is the case where the input waveform is 0 and the rectification direction is on the plus side with respect to the ground potential. At this time, since the peak voltage VP4 is equal to or higher than the maximum voltage value V2, the comparison circuit 41 determines that it is abnormal.

Normally, the peak voltage detection circuit 40 is composed of a charge / discharge circuit having a large discharge time constant with respect to charging, and the comparison circuit 41 is composed of a window comparator circuit having two threshold values.

Example 4. FIG. 10 is a schematic view showing the entire discharge lamp lighting device according to the fourth embodiment of the present invention. In FIG. 10, a rectifier circuit 42 rectifies the voltage of the discharge lamp 10. Reference numeral 43 is an integrating circuit A, and 44 is an integrating circuit B, which integrates the output of the rectifying circuit 10. The integration time constant TA of the integration circuit A43 and the integration time constant TB of the integration circuit B44 are set so that TA << TB. Reference numeral 45 denotes a differential amplifier circuit which inputs the integrating circuit A43 and the integrating circuit B44. Reference numeral 46 denotes a comparison circuit, which outputs the output of the differential amplifier circuit 45 and a preset voltage Vref.
And the magnitude relationship is output. The output of the comparison circuit 46 is input to the control circuit 14, and the result of the comparison circuit 46 causes the control circuit 1 to output.
The oscillation of the oscillation circuit 15 is stopped via 4.

Next, the operation will be described with reference to the waveform chart shown in FIG. (1) of FIG. 11 is a voltage waveform of the discharge lamp 10, and is a voltage waveform when the discharge lamp 10 is abnormally lit by some element during normal lighting. For example, as a cause of this, a transient state is assumed when the discharge lamp is to be removed while it is on. FIG. 11B shows an output waveform in which the discharge lamp voltage rectified by the rectifying circuit 42 is input and integrated by the integrating circuit A43.
Similarly, (2) is the output waveform of the integrating circuit B44.
(4) is an output waveform of the differential amplifier circuit 45, which is an integration circuit A43.
And the output difference of the integration circuit B44 is amplified, and in the case of normal lighting, the difference is 0, so the output of the differential amplifier circuit 45 is also 0. When abnormal lighting occurs, the voltage of the discharge lamp 10 rises, and since the time constants of the integrating circuit A44 and the integrating circuit B45 are different, the difference between the two is amplified and output to the differential amplifier circuit 45.
The comparison circuit 46 outputs the signal shown in (5) when the difference voltage becomes equal to or higher than Vref. The control circuit 14 stops the output of the oscillation circuit 15 by the output of the comparison circuit 46. The integrator circuit A43 and the integrator circuit B44 are configured by a heavy discharge circuit including resistors and capacitors, the differential amplifier circuit 45 is configured by an operational amplifier, and the comparison circuit 46 is configured by a comparator.

Example 5. FIG. 12 is a schematic diagram showing the entire discharge lamp lighting device according to the fifth embodiment of the present invention. The basic operation is the same as that of the conventional discharge lamp lighting device. The conventional discharge lamp lighting device shown in FIG. 19 and the embodiment shown in FIG. 12 have exactly the same operation although the connection position of the capacitor 12 is different. In this embodiment, the voltage is detected from the discharge lamp 10 and it is easy to explain. Capacitor 12 on the inverter 4 side
Are connected. In FIG. 12, reference numeral 47 denotes a load detection circuit, which forms, for example, a DC closed loop including the electrodes of the discharge lamp, and determines whether or not there is a load depending on whether the loop is closed or open. The signal from the load detection circuit 47 is input to the control circuit 14, and when no load is determined, the control circuit 14 stops the operation of the oscillation circuit 15.

FIG. 13 is a block diagram embodying the control circuit 14 of the fifth embodiment, in which the connection signal 4 from the load detection circuit is used.
9. A switch 48 for forcibly switching the load connection signal,
An abnormality detection signal from the lamp abnormality detection circuit 50, an inverter stop circuit 52, an inverter drive circuit 53, and an initialization signal generation circuit 51. When the output state from the load detection circuit 47 is switched to a state equivalent to the unloaded state, the inverter stop circuit 52 operates to stop the operation of the inverter 4. When the output state is changed from the no-load state to the load connection state, an initialization signal is generated by the initialization signal generation circuit 51 and the inverter stop circuit 52, the load detection circuit 47, the lamp abnormality detection circuit 25, and the inverter drive circuit 53 are initialized. Is started.

Inverter stop circuit 52 due to lamp abnormality
Even when the inverter operates to stop the oscillation, the lamp start is similarly started by changing the output state from the load detection circuit 47 from the no-load state to the load connection state. Therefore, when the abnormal lamp is replaced, the lamp can be turned on / off by the switch 48 for switching the output state from the load detection circuit.

Example 6. FIG. 14 is a schematic diagram showing the entire discharge lamp lighting device according to the sixth embodiment of the present invention. The basic operation is the same as that of the conventional discharge lamp lighting device. The conventional discharge lamp lighting device shown in FIG. 19 and the embodiment shown in FIG. 14 have exactly the same operation although the connection position of the capacitor 12 is different. In this embodiment, the voltage is detected from the discharge lamp 10 and it is easy to explain. Capacitor 12 on the inverter 4 side
Are connected. In FIG. 14, reference numeral 54 is a DC voltage conversion circuit, 55 is a choke coil, 57 is a switching element, a power transistor or a power MOS FE.
T and 56 are diodes, 58 is a capacitor, 59 is a control circuit for the DC voltage conversion circuit, and 60 is a DC voltage conversion circuit 54.
This is the oscillator circuit. 61 is the control circuit 14 of the inverter 4
And the oscillator circuit 15 are integrated into one. The signal from the load detection circuit 47 is input to the control circuit 14 and when no load is determined, the control circuit 14 stops the operation of the oscillation circuit 15 and is also input to the control circuit 59 of the DC voltage conversion circuit 54 when no load is determined. Stops the oscillation of the oscillation circuit 60, stops the operation of the switching element 57, and also stops the DC voltage conversion circuit 54.

Further, when the lamp is abnormal, the operation of the inverter 4 is stopped by the signal from the abnormality detecting circuit 25, and the abnormality detecting circuit 2 is also provided to the control circuit 59 of the DC voltage converting circuit 54.
The signal from 5 is input and the operation of the DC voltage conversion circuit 54 is stopped.

Example 7. FIG. 15 is a schematic diagram showing the entire discharge lamp lighting device according to the seventh embodiment of the present invention. In FIG. 15, a resistor 62 is connected to the filament 10a and the filament 10b. Therefore, the DC power supply 3
A DC circuit is formed from 9 through the choke coil 9, the filament 10a, and the filament 10b. Reference numeral 63 is a load detection circuit for detecting the presence or absence of the discharge lamp 10 which is the load of the inverter 4. When a current is flowing from the DC power supply 39 to the DC circuit, it is judged that there is the discharge lamp 10, that is, the load, and the discharge lamp 10 is discharged. Since no DC circuit is formed when there is no light, it is determined that no current flows and there is no load. As described above, in the method of detecting the load by the DC circuit including the discharge lamp 10, when the discharge lamp, which is the load, is in an abnormal state, the voltage of the discharge lamp 10 adversely affects the load detection circuit 63 and the lighting device malfunctions. It often happens.

Reference numeral 64 denotes a gate circuit, which controls the output of the load detection circuit 63 when the oscillation circuit 15 outputs no oscillation.
4 and the oscillation output is present, the output of the load detection circuit 63 is operated so as not to be transmitted to the control circuit 14. Therefore, the control circuit 14 knows the presence or absence of the discharge lamp when the power supply 1 is supplied, and if the oscillation circuit 15 is oscillated and the oscillation circuit 15 oscillates, the load detection output is not input to the control circuit 14 by the gate circuit 64. Even if the discharge lamp is in an abnormal state, it is possible to prevent malfunction due to the load detection output.

Example 8. FIG. 16 is a schematic diagram showing the entire discharge lamp lighting device according to the eighth embodiment of the present invention. The basic operation is the same as in the seventh embodiment. Here, the control circuit 14 outputs the illustrated preheat end signal to the gate circuit 64 when the preheat period ends, and since the load detection output is not input to the control circuit 14 after the preheat end, even if the discharge lamp is in an abnormal state. Malfunction due to load detection output can be prevented.

Example 9. FIG. 17 is a schematic diagram of an abnormality detection circuit of a discharge lamp lighting device according to a ninth embodiment of the present invention. The basic operation of the discharge lamp lighting device is the same as that of the conventional discharge lamp lighting device. In FIG. 17, reference numeral 65 is an abnormality signal from the abnormality detection circuit 25, and 66 is an initialization signal generation circuit 5.
The initialization signal from 1 and 67 are comparison circuits, which are comparators 68 for determining an abnormal state according to the level of the abnormal signal. Reference numeral 69 is a latch circuit for storing the output of each comparator, which is composed of a flip-flop, and indicates an abnormal state by the output state of the flip-flop. For example AB1
Is H level, AB2 is L level, AB3 is L level, overvoltage abnormality, AB1 is H level, AB2 is H level,
When AB3 is at L level, it means that the half-wave discharge is abnormal.

Example 10. FIG. 18 shows the first embodiment of the present invention.
It is a block diagram which shows schematically the oscillation circuit of the discharge lamp lighting device by 0. The basic operation of the discharge lamp lighting device is the same as that of the conventional discharge lamp lighting device. In FIG. 18, reference numeral 70 denotes a clock a for switching the timing of changing the oscillation frequency.
71 is a sweep counter for changing frequency data by the clock a, and 72 is a sweep counter 7.
1 is a ring counter which receives the data of 1 and generates an output frequency, 73 is a reference clock of the ring counter, 74 is a comparator for checking the coincidence of frequency data, and 75 is preset with external input data which is frequency comparison data. It is an adder that adds certain data.

For example, as shown in FIG. 18, the frequency data consists of an 8-bit binary number, the external input data is the lower 3 bits, and the upper 5 bits are preset. By changing the lower 3 bits of the external input, the comparator 74
The frequency data determined to be coincident with each other are different. For example, when the frequency for which the coincidence is determined is a certain discharge frequency, it is possible to change the frequency and perform fine adjustment, so that the certain discharge frequency can be adjusted.

The above embodiments may be used individually or in combination. The configuration of the load circuit including the discharge lamp can be appropriately modified in addition to the configuration described in the embodiment, and the specific configuration of the control circuit may be configured by a circuit other than that described in the description, and further the abnormality detection protection The specific configurations of the means and the load detection means are not limited to those in the embodiment. Also,
Although the above embodiment describes the discharge lamp, the present invention can be applied to a high pressure discharge lamp other than the discharge lamp. Further, as the input power to the inverter 4, a battery or the like may be used, a DC voltage conversion circuit as shown in FIG. 14 may be used, or a rectifying / smoothing circuit as shown in FIG. 19 may be used. You may. Further, the semiconductor switches 8 and 9 can use bipolar transistors, POWER MON FETs and other elements.

[0063]

According to the discharge lamp lighting device of the present invention, an inverter device for converting electric power supplied from a DC power source into high frequency power, a control circuit for controlling the operation of the inverter device, an inductive element and a capacitor in the inverter device. Having a LC series circuit composed of a conductive element and a discharge lamp that constitutes a load circuit together with the LC series circuit, a means for preheating the electrodes of the discharge lamp when starting and lighting the discharge lamp, and applying a high voltage to the discharge lamp. In a lighting device equipped with a means for starting discharge and an abnormality detection protection means for protecting the inverter when the discharge lamp is abnormal, the discharge lamp is started and started by changing the output frequency of the inverter. Along with the means for increasing the time interval of frequency change at the time of discharge start operation, it is equipped with a means for increasing the time interval of frequency change at the time of discharge start operation. When the high pressure application for the lamp discharge start can smoothly perform it, it is possible to prevent the high voltage generation more than necessary.

The discharge lamp lighting device according to a second aspect of the present invention is provided with a means for setting the time until the steady lighting is 200 [mS] or more and 1000 [mS] or less after the preheating operation at the time of starting and lighting the discharge lamp. So when you try to start the lamp or dimming,
It is possible to smoothly switch the light output after the start of the lamp discharge, and it is possible to obtain a start-up lighting that does not cause a sense of discomfort at the start of dimming without recognizing a change in the light output.

In the discharge lamp lighting device according to the third aspect of the present invention, the time from the end of the preheating operation to the application of a sufficient dischargeable voltage at the time of starting and lighting the discharge lamp is set to T1, and after steady application of a reliable discharge voltage, a steady state is established. Since the time until reaching the lighting frequency is T2, and the means for setting the relationship between T1 and T2 to be 10T1>T2> T1 is provided, when the lamp is started and the dimming start is attempted, the light output after the lamp discharge is started The switching can be performed smoothly, and it is possible to obtain a start-up lighting that does not cause a sense of discomfort at the start of dimming without recognizing a change in light output.

A discharge lamp lighting device according to a fourth aspect of the present invention is an inverter device for converting electric power supplied from a DC power source into high frequency power, a control circuit for controlling the operation of the inverter device, an inductive element and a capacitive element in the inverter device. Consisting of L
It has a C series circuit and a discharge lamp that constitutes a load circuit together with this LC series circuit, means for preheating the electrodes of the discharge lamp when starting and lighting this discharge lamp, and applying high voltage to the discharge lamp to start discharge. In a lighting device that includes a means for activating the discharge lamp and an abnormality detection protection means that protects the inverter when the discharge lamp is abnormal, in a lighting device that changes the output frequency of the inverter, the discharge is started after the preheating of the discharge lamp is completed. A sufficient voltage (discharging voltage) is maintained for a predetermined time T4, and if a signal from the lamp malfunction detecting means determines an abnormality, the discharging voltage is further applied for a time T4 or longer, and if the same applies thereafter. For example, since a means for repeating this sequence is provided, it is possible to prevent damage to the inverter due to lamp abnormality at the time of lamp startup, and to apply high voltage to the lamp for an unnecessarily long time. It is immediately possible.

A discharge lamp lighting device according to a fifth aspect of the present invention is an inverter device for converting electric power supplied from a DC power source into high frequency power, a control circuit for controlling the operation of the inverter device, an inductive element and a capacitive element in the inverter device. Consisting of L
It has a C series circuit and a discharge lamp that constitutes a load circuit together with this LC series circuit, means for preheating the electrodes of the discharge lamp when starting and lighting this discharge lamp, and applying high voltage to the discharge lamp to start discharge. In the discharge lamp lighting device equipped with the means for suppressing the discharge lamp and the abnormality detection protection means for protecting the inverter when the discharge lamp is abnormal, since the means for superimposing the DC voltage on the load voltage is provided, it is possible to reliably detect the abnormality when the lamp is abnormal. I can do it.

A discharge lamp lighting device according to a sixth aspect of the present invention comprises an inverter device for converting electric power supplied from a DC power source into high frequency power, a control circuit for controlling the inverter device, and an inductive element and a capacitive element in the inverter device. It has an LC series circuit and a discharge lamp that constitutes a load circuit together with this LC series circuit, means for preheating the electrodes of the discharge lamp when starting and lighting this discharge lamp, and applying high voltage to the discharge lamp to start discharge. In a discharge lamp lighting device provided with a biasing means and an abnormality detection protection means for protecting the inverter when the discharge lamp is abnormal, the abnormality detection protection means detects a voltage according to a load voltage, and an integration circuit having different time constants. In the case of a lamp failure, a means for performing the protection operation of the inverter is provided when the rate of change of the detected voltage changes abruptly by using the configuration including 1 and 2 and the operation amplification circuit. Anomaly detection can surely do things.

The discharge lamp lighting device according to claim 7 is an inverter device for converting electric power supplied from a DC power source into high frequency power, a control circuit for controlling the operation of the inverter device, an inductive element and a capacitive element in the inverter device. Consisting of L
A discharge lamp lighting device having a C series circuit and a discharge lamp that constitutes a load circuit together with the LC series circuit, and comprising a load detection means and an abnormality detection protection means for protecting the inverter when the discharge lamp is abnormal. The control circuit is provided with input means for stopping the operation of the inverter by a signal from the load detection means, and means for turning on / off the light by turning on the output side of the load detection means by connecting a switch for switching its output signal state. Since it is equipped, it is possible to turn on and off the lamp without using a high-voltage cutoff switch such as a relay.
The configuration can be simplified and the cost can be reduced.

Since the discharge lamp lighting device according to claim 8 has means for masking the output signal of the load detecting means provided in the control circuit during the generation of the inverter drive signal and always judging the presence of the load, the presence or absence of the discharge lamp is detected. It is possible to obtain a stable lighting state by preventing the signal from being influenced by the state of the lamp.

Since the discharge lamp lighting device according to claim 9 is provided with means for masking the output signal of the load detecting means provided in the control circuit until the lighting after the end of preheating and determining the presence of the load, the presence or absence of the discharge lamp is provided. It is possible to obtain a stable lighting state by preventing the detection signal from being influenced by the lamp state.

A discharge lamp lighting device according to a tenth aspect of the present invention includes a commercial AC power source and a rectifying circuit for rectifying the commercial AC power source, a DC voltage conversion circuit capable of varying an output voltage with the power rectified by the rectifying circuit as an input, and the DC voltage. An inverter circuit that converts direct-current power from the conversion circuit to high-frequency power, a control circuit that controls the operation of the inverter circuit, an LC series circuit that includes an inductive element and a capacitive element in the inverter circuit, and a load together with the LC series circuit. A discharge lamp that constitutes a circuit, a means for preheating the electrodes of the discharge lamp when starting and lighting this discharge lamp, a means for applying high voltage to the discharge lamp to discharge it, and protecting the inverter when the discharge lamp is abnormal In a discharge lamp lighting device equipped with abnormality detection protection means and load detection means for detecting the presence or absence of a discharge lamp, etc. Since a means for stopping the operation of the inverter circuit and the operation of the DC voltage conversion circuit is provided, power is not supplied to the load because the operation of the inverter circuit and the DC voltage conversion circuit is stopped for protection in the event of a lamp failure or no load. Further, since a voltage is not applied to the inverter, a safe lighting device can be supplied.

In the discharge lamp lighting device according to the eleventh aspect, by switching the output signal state of the load detecting means, the operation of the inverter device and the operation of the DC voltage conversion circuit are switched to the operating / stopping state to turn on / off the discharge lamp. Since the means is provided, power is not supplied to the load because the operation of the inverter circuit and the DC voltage conversion circuit is stopped for protection in the event of a lamp failure or no load, and a voltage is not applied to the inverter, so a safe lighting device Can be supplied.

The discharge lamp lighting device according to the twelfth aspect of the present invention is an inverter device for converting electric power supplied from a DC power source into high frequency power, a control circuit for controlling the operation of the inverter device, an inductive element and a capacitive element in the inverter device. And a discharge lamp that constitutes a load circuit together with the LC series circuit, and means for preheating the electrodes of the discharge lamp when starting and lighting the discharge lamp, and applying a high voltage to the discharge lamp. In a discharge lamp lighting device provided with a means for discharging and an abnormality detection protection means for protecting the inverter when the discharge lamp is abnormal, the control circuit is provided with means for storing an abnormal state when the inverter is stopped. Even if the inverter is protected due to an error or the like and the inverter stops operating, it is possible to immediately determine what kind of error caused the protection, and it is possible to easily take countermeasures.

The discharge lamp lighting device according to claim 13 is an inverter device for converting electric power supplied from a DC power supply into high frequency power, a control circuit for controlling the operation of the inverter device, an inductive element and a capacitive element in the inverter device. And a discharge lamp that constitutes a load circuit together with the LC series circuit, and means for preheating the electrodes of the discharge lamp when starting and lighting the discharge lamp, and applying a high voltage to the discharge lamp. In a discharge lamp lighting device provided with a means for discharging and an abnormality detection protection means for protecting the inverter when the discharge lamp is abnormal, since a means for setting a high voltage to be applied to start discharge of the discharge lamp is provided. It is possible to absorb the variation in the LC series circuit including the inductive element and the capacitive element connected to the inverter device, and reduce the cost.

[0076]

[Brief description of drawings]

FIG. 1 is a control circuit block diagram of a discharge lamp lighting device according to a first embodiment of the present invention.

FIG. 2 is an operation diagram at the time of starting and lighting the discharge lamp lighting device according to the first embodiment of the present invention.

FIG. 3 is an operation diagram at the time of starting and lighting the discharge lamp lighting device according to the first embodiment of the present invention.

FIG. 4 is an operation diagram at the time of starting and lighting the discharge lamp lighting device according to the first embodiment of the present invention.

FIG. 5 is a circuit configuration diagram of a discharge lamp lighting device according to a second embodiment of the present invention.

FIG. 6 is an operation diagram of a discharge lamp lighting device according to a second embodiment of the present invention.

FIG. 7 is an operation flowchart of the discharge lamp lighting device according to the second embodiment of the present invention.

FIG. 8 is a circuit configuration diagram of a discharge lamp lighting device according to a third embodiment of the present invention.

FIG. 9 is an operation waveform diagram of the discharge lamp lighting device according to the third embodiment of the present invention.

FIG. 10 is a circuit configuration diagram of a discharge lamp lighting device according to a fourth embodiment of the present invention.

FIG. 11 is an operation waveform diagram of the discharge lamp lighting device according to the fourth embodiment of the present invention.

FIG. 12 is a circuit configuration diagram of a discharge lamp lighting device according to a fifth embodiment of the present invention.

FIG. 13 is a block diagram of a control circuit of a discharge lamp lighting device according to a fifth embodiment of the present invention.

FIG. 14 is a circuit configuration diagram of a discharge lamp lighting device according to a sixth embodiment of the present invention.

FIG. 15 is a control circuit block diagram of a discharge lamp lighting device according to a seventh embodiment of the present invention.

FIG. 16 is a control circuit block diagram of a discharge lamp lighting device according to an eighth embodiment of the present invention.

FIG. 17 is a configuration diagram of an abnormality detection circuit of a discharge lamp lighting device according to a ninth embodiment of the present invention.

FIG. 18 is a control circuit configuration diagram of a discharge lamp lighting device according to a tenth embodiment of the present invention.

FIG. 19 is a circuit configuration diagram of a conventional discharge lamp lighting device.

FIG. 20 is an operation waveform diagram of a conventional discharge lamp lighting device.

FIG. 21 is an operation waveform diagram of a conventional discharge lamp lighting device.

FIG. 22 is an operation waveform diagram of a conventional discharge lamp lighting device.

[Explanation of symbols]

 1 Commercial power supply 2 Rectifier circuit 4 Inverter 5 High breakdown voltage diode 6 High breakdown voltage diode 7 Switching element 8 Switching element 9 Choke coil 10 Discharge lamp 11 Resonance capacitor 12 Coupling capacitor 14 Oscillation circuit 15 Control circuit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hiroyoshi Yamazaki Inventor Hiroyoshi Yamanaka 2-14-40 Kamakura-shi Life Systems Research Laboratories, Mitsubishi Electric Corporation (72) Inventor Noriyuki Maeda 5-1-1 Ofuna, Kamakura City Mitsubishi Electric Lighting Co., Ltd. (72) Inventor Kazutaka Shimizu 5-1, 1-1 Ofuna, Kamakura-shi Mitsubishi Electric Lighting Co., Ltd.

Claims (13)

[Claims] 1. An LC serial circuit comprising an inverter device for converting electric power supplied from a DC power supply into high frequency power, a control circuit for controlling the operation of the inverter device, an inductive element and a capacitive element connected to the inverter device. Circuit,
A discharge lamp that constitutes a load circuit together with the LC series circuit, means for preheating the electrodes of the discharge lamp at the time of starting and lighting the discharge lamp, means for applying a high voltage to the discharge lamp to start discharge, In a lighting device having an abnormality detection protection means for protecting an inverter when an abnormality occurs in the electric lamp, the discharge lamp is started / discharged by changing the output frequency of the inverter, and the frequency when the discharge lamp is preheated A discharge lamp lighting device, characterized in that the control circuit is provided with means for making a time interval of frequency change at the time of discharge start operation longer than a time interval of change. 2. The time until the steady lighting is 200 [mS] or more after starting the preheating operation at the time of starting and lighting the discharge lamp.
The discharge lamp lighting device according to claim 1, characterized in that the control circuit is provided with means for reducing the value to [mS] or less. 3. The time from the end of the preheating operation to the time when a sufficient dischargeable voltage is applied at the time of starting and lighting the discharge lamp, and the time until the steady lighting frequency is reached after the reliable discharge voltage is applied. Is T2, and the relationship between T1 and T2 is 10T1>
2. The discharge lamp lighting device according to claim 1, wherein the control circuit is provided with means for satisfying T2> T1. 4. An inverter device for converting electric power supplied from a DC power source into high frequency power, a control circuit for controlling the operation of the inverter device, an LC series circuit including an inductive element and a capacitive element in the inverter device, A discharge lamp that constitutes a load circuit together with the LC series circuit, means for preheating the electrodes of the discharge lamp when starting and lighting the discharge lamp, and means for applying a high voltage to the discharge lamp to start discharge.
In a lighting device that includes an abnormality detection protection unit that protects the inverter when the discharge lamp is abnormal and changes the output frequency of the inverter for starting and lighting the discharge lamp, a voltage sufficient for starting discharge after preheating of the discharge lamp. (Discharge voltage) is applied and maintained for a predetermined time T4, and when an abnormality is determined by the signal from the lamp abnormality detecting means, the discharge voltage is applied for a further time T4 or longer, and if this is the same, this sequence is followed. A discharge lamp lighting device, wherein the control circuit is provided with a repeating means. 5. An LC series comprising an inverter device for converting electric power supplied from a DC power supply into high frequency power, a control circuit for controlling the operation of the inverter device, an inductive element and a capacitive element connected to the inverter device. Circuit,
A discharge lamp that constitutes a load circuit together with the LC series circuit, means for preheating the electrodes of the discharge lamp at the time of starting and lighting the discharge lamp, means for applying a high voltage to the discharge lamp to start discharge, What is claimed is: 1. A discharge lamp lighting device, comprising: an abnormality detection protection unit that protects an inverter when an electric lamp malfunctions; a discharge lamp lighting device having a unit that superimposes a DC voltage on a load voltage. 6. An inverter device for converting electric power supplied from a DC power supply into high frequency power, a control circuit for controlling the inverter device, and an LC series circuit including an inductive element and a capacitive element connected to the inverter device. , This L
A discharge lamp that constitutes a load circuit together with a C series circuit, means for preheating the electrodes of the discharge lamp when starting and lighting the discharge lamp, means for applying a high voltage to the discharge lamp to start discharge, In a discharge lamp lighting device provided with an abnormality detection protection means for protecting an inverter in the event of an abnormality, the abnormality detection protection means detects a voltage corresponding to a load voltage, and integrate circuits 1 and 2 having different time constants and operation amplification. A discharge lamp lighting device, characterized in that a protection operation of the inverter is carried out when the rate of change of the detected voltage changes abruptly using a circuit configuration. 7. An LC serial circuit comprising an inverter device for converting electric power supplied from a DC power supply into high frequency power, a control circuit for controlling the operation of the inverter device, an inductive element and a capacitive element connected to the inverter device. Circuit,
In the discharge lamp lighting device, which has a discharge lamp that constitutes a load circuit together with the LC series circuit, and which includes load detection means and abnormality detection protection means that protects the inverter when the discharge lamp has an abnormality, the control circuit includes a load. An input means for stopping the operation of the inverter by a signal from the detection means is provided, and a means for turning on and off by connecting a switch for switching the output signal state to the output side of the load detection means is characterized. Discharge lamp lighting device. 8. The discharge lamp according to claim 7, wherein the control circuit is provided with a means for masking an output signal indicating an abnormality of the load detecting means while the inverter drive signal is being generated and for always judging that a load is present. Lighting device. 9. The control circuit according to claim 7, wherein the control circuit is provided with means for masking an output signal indicating an abnormality of the load detecting means until the lighting after the preheating is finished and determining the presence of a load. Electric lighting device. 10. A commercial AC power supply and a rectifier circuit for rectifying the commercial AC power supply, a DC voltage conversion circuit capable of varying an output voltage with the power rectified by the rectification circuit as an input, and DC power from the DC voltage conversion circuit. An inverter circuit for converting into high frequency power, a control circuit for controlling the operation of the inverter circuit, an LC series circuit including an inductive element and a capacitive element connected to the inverter circuit, and a load circuit together with the LC series circuit A discharge lamp, means for preheating the electrodes of the discharge lamp when starting and lighting the discharge lamp, means for applying high voltage to the discharge lamp to cause discharge, and abnormality detection protection means for protecting the inverter when the discharge lamp is abnormal In a discharge lamp lighting device equipped with a load detection means for detecting the presence or absence of a discharge lamp and the like, an inverter circuit and a DC A discharge lamp lighting device characterized in that the control circuit is provided with means for stopping the operation of the pressure conversion circuit. 11. The control circuit is provided with means for switching the operation of the inverter device and the operation of the DC voltage conversion circuit to an operating / stopping state by switching the output signal state of the load detecting means to turn on / off the discharge lamp. The discharge lamp lighting device according to claim 10, wherein 12. An LC series comprising an inverter device for converting electric power supplied from a DC power supply into high frequency power, a control circuit for controlling the operation of the inverter device, an inductive element and a capacitive element connected to the inverter device. A circuit and a discharge lamp that constitutes a load circuit together with this LC series circuit, and means for preheating the electrodes of the discharge lamp when starting and lighting this discharge lamp, and means for applying a high voltage to the discharge lamp to cause discharge. In a discharge lamp lighting device provided with an abnormality detection protection means for protecting an inverter in the event of a discharge lamp abnormality, the control circuit is provided with means for storing an abnormal state when the inverter stops. Electric lighting device. 13. An LC serial circuit comprising an inverter device for converting electric power supplied from a DC power supply into high frequency power, a control circuit for controlling the operation of the inverter device, an inductive element and a capacitive element connected to the inverter device. A circuit and a discharge lamp that constitutes a load circuit together with this LC series circuit, and means for preheating the electrodes of the discharge lamp when starting and lighting this discharge lamp, and means for applying a high voltage to the discharge lamp to cause discharge. In a discharge lamp lighting device provided with an abnormality detection protection means for protecting an inverter when a discharge lamp is abnormal, a means for setting a high voltage applied to start discharge of the discharge lamp is provided in the control circuit. Discharge lamp lighting device characterized by.