JPH06124790A - High pressure electric discharge lamp lighting device and electric discharge lamp lighting device - Google Patents

Abstract

PURPOSE:To provide a high pressure electric discharge lamp lighting device in simple constitution at low manufacturing cost without using an inverter circuit. CONSTITUTION:A poloarity switching circuit 8 detects turning on and off of a lighting switch 2, and reverses an unillustrated relay energizing condition, and drives switches 9a and 9b being relay contact points, and switches output polarity of a DC pressure increasing circuit 3 alternately to/from each other in synchronism with lighting and lights out, and supplies it to a high pressure electric discharge lamp 6. In this way, since the output polarity to the high pressure electric discharge lamp 6 is switched, even if an inverter circuit is not used, an electrode of the high pressure electric discharge lamp 6 is not degraded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high pressure discharge lamp lighting device and a discharge lamp lighting device, and more particularly to simplification of the structure thereof.

[0002]

2. Description of the Related Art Conventionally, as a high pressure discharge lamp lighting device, FIG.
2, there is a configuration shown in FIG. FIG. 32 shows Conventional Example 1
It is a block diagram of. In the configuration shown in the figure, when the lighting switch 2 is closed, the voltage from the DC power supply 1 is input to the DC voltage conversion circuit 3, and the AC voltage is output from the inverter circuit 4 to the igniter circuit 5-1. The high voltage generated in the igniter circuit 5-1 is applied to the high pressure discharge lamp 6 to insulate the enclosed gas in the high pressure discharge lamp 6, and the high voltage discharge lamp 6 is subjected to the AC power supplied from the inverter circuit 4.
Lights up. After the high-pressure discharge lamp 6 is turned on, the control circuit 7-1 adjusts the output voltage of the direct-current voltage conversion circuit 3 to control the electric power supplied to the high-pressure discharge lamp 6 to make the light output from the high-pressure discharge lamp 6 constant.

FIG. 33 is a block diagram of Conventional Example 2. In the illustrated configuration, when the lighting switch 2 is closed, the DC power source 1
Is input to the DC voltage conversion circuit 3, and the AC voltage is output from the inverter circuit 4 to the igniter circuit 5-2. The high voltage generated in the igniter circuit 5-2 is applied to the high pressure discharge lamp 6 to cause dielectric breakdown of the enclosed gas in the high pressure discharge lamp 6, and the AC power supplied from the inverter circuit 4 via the coils 10a and 10b. The high-pressure discharge lamp 6 lights up. The coils 10a and 10b prevent the high voltage generated in the igniter circuit 5-2 at the time of starting from flowing back to the inverter circuit 4. In addition, the control circuit 7-2 adjusts the output voltage of the DC voltage conversion circuit 3 after the high-pressure discharge lamp 6 is turned on and adjusts the output voltage.
The power output to the high pressure discharge lamp 6 is controlled to be constant.

FIG. 34 shows a specific circuit configuration of the DC voltage conversion circuit 3 and the inverter circuit 4 in FIG. 33. A resonance circuit is formed by the primary side of the capacitor 31 and the transformer 32, and the transistor 33 is a control circuit. The high frequency voltage boosted from the secondary side of the transformer 32 is output by switching at high frequency by 7-2. Diode 34,
The capacitor 35 constitutes a rectifying and smoothing circuit and converts the high frequency voltage from the transformer 32 into a DC voltage. The inverter circuits 4 are composed of the transistors 41, 42, 43, 44 connected in a bridge type, and the base terminals of the transistors 41, 42, 43, 44 are connected to the oscillation circuit 46 via the driver circuit 45. Oscillation circuit 46
Produces a low frequency signal. The resistors 61 and 62 are connected to limit the lamp current flowing through the high pressure discharge lamp 6.

FIG. 35 is a timing chart showing the operation of each circuit of FIG. 34. 1 is the operation waveform of the transistor 33, the ON / OFF ratio of the transistor 33 determines the output voltage of the DC voltage conversion circuit 3, and 2 is the capacitor. The charging voltage of 35, that is, the output voltage of the DC voltage conversion circuit 3 is shown. 3 is a transistor 4 driven in synchronization with the output of the oscillation circuit 46
Similarly, reference numerals 1 and 44 indicate ON / OFF states of the transistors 43 and 42. When the transistor 41 on the power supply side is on, the transistor 44 on the ground side turns on and the transistor 43 on the power supply side turns on. When turned on, the transistor operates on the ground side so as to turn on. Reference numeral 5 denotes a voltage applied to the high-pressure discharge lamp 6, and thus a low-frequency AC voltage is applied to the high-pressure discharge lamp 6.

[0006]

It is impossible to drive a high-pressure discharge lamp with direct current because the electrodes of the discharge lamp are deteriorated. Conventionally, as in conventional examples 1 and 2, an inverter circuit converts direct current into alternating current. Supply to the discharge lamp. However, the inverter circuit requires a high-output power switching element, and a special circuit is used to drive the switching element, resulting in a high cost.

The present invention has been made to solve such a problem, and it is not necessary to use an inverter circuit.
An object of the present invention is to provide a high pressure discharge lamp lighting device having a simple structure and low manufacturing cost.

[0008]

According to a first aspect of the present invention, there is provided a high voltage discharge lamp lighting device including a direct current voltage conversion circuit, a switch for switching the polarity of the output of the direct current voltage conversion circuit, and supplying the high pressure discharge lamp with the switch. Switch driving means for driving the switch.

A high pressure discharge lamp lighting device according to a second aspect of the present invention includes a first DC voltage conversion circuit, a second DC voltage conversion circuit, an output of the first DC voltage conversion circuit, and the second DC voltage conversion circuit. The circuit output is provided with a switch for selecting the output polarity so as to alternately change the output polarity and supplying the high-pressure discharge lamp, and a switch driving means for driving the switch.

The high pressure discharge lamp lighting device according to claim 3 is the high pressure discharge lamp lighting device according to claim 1 or 2.
The switch driving means operates in synchronization with lighting and extinguishing operations.

The high pressure discharge lamp lighting device according to claim 4 is the high pressure discharge lamp lighting device according to claim 1 or 2.
The switch driving means operates in synchronization with the ultra low frequency signal or the low frequency signal.

A discharge lamp lighting device according to a fifth aspect of the present invention comprises a discharge lamp,
A direct current voltage conversion circuit connected to both ends of the discharge lamp, a semiconductor switch connected in parallel with the direct current voltage conversion circuit, and the direct current voltage conversion circuit are alternately output in synchronization with a low frequency, and are simultaneously suspended. A discharge lamp lighting device comprising means for conducting the semiconductor switch connected in parallel with the DC voltage conversion circuit to invert the polarity of the current flowing in the discharge lamp, and a predetermined output voltage of the DC voltage conversion circuit. It is provided with a means for outputting a signal for outputting a voltage earlier than an ON signal of the semiconductor switch on the opposite side of the discharge lamp by a predetermined time.

A discharge lamp lighting device according to a sixth aspect includes a discharge lamp,
A direct current voltage conversion circuit connected to both ends of the discharge lamp, a semiconductor switch connected in parallel with the direct current voltage conversion circuit, and the direct current voltage conversion circuit are alternately output in synchronization with a low frequency, and are simultaneously suspended. In a discharge lamp lighting device having means for conducting the semiconductor switch connected in parallel with the DC voltage conversion circuit to reverse the polarity of the current flowing in the discharge lamp, a predetermined time period immediately after the semiconductor switch is turned on. Is equipped with a means for increasing the on-duty of the high frequency switching signal in the DC voltage conversion circuit on the opposite side of the discharge lamp.

A discharge lamp lighting device according to claim 7 is a discharge lamp,
A direct current voltage conversion circuit connected to both ends of the discharge lamp, a semiconductor switch connected in parallel with the direct current voltage conversion circuit, and the direct current voltage conversion circuit are alternately output in synchronization with a low frequency, and are simultaneously suspended. A discharge lamp lighting device comprising means for electrically connecting the semiconductor switch connected in parallel with the DC voltage conversion circuit to reverse the polarity of the current flowing in the discharge lamp, between the discharge lamp and the semiconductor switch. It has an inserted coil.

A discharge lamp lighting device according to claim 8 is a discharge lamp,
A direct current voltage conversion circuit connected to both ends of the discharge lamp, a semiconductor switch connected in parallel with the direct current voltage conversion circuit, and the direct current voltage conversion circuit are alternately output in synchronization with a low frequency, and are simultaneously suspended. A discharge lamp lighting device comprising means for conducting the semiconductor switch connected in parallel with the DC voltage conversion circuit to invert the polarity of the current flowing in the discharge lamp, and a predetermined output voltage of the DC voltage conversion circuit. A means for extinguishing a signal for outputting a voltage earlier than a turn-off signal of the semiconductor switch on the opposite side of the discharge lamp by a predetermined time is provided.

A discharge lamp lighting device according to a ninth aspect is a discharge lamp,
A direct current voltage conversion circuit connected to both ends of the discharge lamp, a semiconductor switch connected in parallel with the direct current voltage conversion circuit, and the direct current voltage conversion circuit are alternately output in synchronization with a low frequency, and are simultaneously suspended. In the discharge lamp lighting device, the semiconductor switch connected in parallel with the direct current voltage conversion circuit is turned on to reverse the polarity of the current flowing through the discharge lamp. It is provided with a means for synchronizing with the rising of a high frequency switching signal in the DC voltage conversion circuit on the opposite side of the electric lamp.

According to a tenth aspect of the present invention, there is provided a discharge lamp lighting device, a discharge lamp, a DC voltage conversion circuit connected to both ends of the discharge lamp, a semiconductor switch connected in parallel with the DC voltage conversion circuit, and the DC voltage. And a means for alternately outputting the conversion circuit in synchronization with a low frequency, and at the same time conducting the semiconductor switch connected in parallel with the DC voltage conversion circuit at rest to invert the polarity of the current flowing through the discharge lamp. The discharge lamp lighting device further comprises a transformer inserted between the discharge lamp and the semiconductor switch.

A discharge lamp lighting device according to claim 11 is a discharge lamp, a DC voltage conversion circuit connected to both ends of the discharge lamp, a semiconductor switch connected in parallel with the DC voltage conversion circuit, and the DC voltage. And a means for alternately outputting the conversion circuit in synchronization with a low frequency, and at the same time conducting the semiconductor switch connected in parallel with the DC voltage conversion circuit at rest to invert the polarity of the current flowing through the discharge lamp. In the discharge lamp lighting device, a smoothing capacitor provided at both ends of the discharge lamp and shared by the DC voltage conversion circuit is provided.

According to a twelfth aspect of the present invention, there is provided a discharge lamp lighting device, a discharge lamp, a DC voltage conversion circuit connected to both ends of the discharge lamp, a semiconductor switch connected in parallel with the DC voltage conversion circuit, and the DC voltage. And a means for alternately outputting the conversion circuit in synchronization with a low frequency, and at the same time conducting the semiconductor switch connected in parallel with the DC voltage conversion circuit at rest to invert the polarity of the current flowing through the discharge lamp. In the discharge lamp lighting device described above, the DC voltage conversion circuit makes the number of turns of one step-up transformer larger than the number of turns of the other step-up transformer to perform dielectric breakdown of the discharge lamp, and when the DC power supply voltage is below a predetermined value. When this happens, the DC voltage conversion circuit having the step-up transformer with a large number of turns is driven.

A discharge lamp lighting device according to a thirteenth aspect of the invention is a discharge lamp, a DC voltage conversion circuit connected to both ends of the discharge lamp, a semiconductor switch connected in parallel with the DC voltage conversion circuit, and the DC voltage. And a means for alternately outputting the conversion circuit in synchronization with a low frequency, and at the same time conducting the semiconductor switch connected in parallel with the DC voltage conversion circuit at rest to invert the polarity of the current flowing through the discharge lamp. In the discharge lamp lighting device, the ON signal of the semiconductor switch is provided with means for synchronizing with the trailing edge of the high frequency switching signal in the DC voltage conversion circuit on the opposite side of the discharge lamp.

A discharge lamp lighting device according to a fourteenth aspect of the present invention is a discharge lamp, a DC voltage conversion circuit connected to both ends of the discharge lamp, a semiconductor switch connected in parallel with the DC voltage conversion circuit, and the DC voltage. And a means for alternately outputting the conversion circuit in synchronization with a low frequency, and at the same time conducting the semiconductor switch connected in parallel with the DC voltage conversion circuit at rest to invert the polarity of the current flowing through the discharge lamp. The discharge lamp lighting device further comprises a transformer inserted between the discharge lamp and the semiconductor switch.

A discharge lamp lighting device according to a fifteenth aspect of the present invention is a discharge lamp, a DC voltage conversion circuit connected to both ends of the discharge lamp, a semiconductor switch connected in parallel with the DC voltage conversion circuit, and the DC voltage. And a means for alternately outputting the conversion circuit in synchronization with a low frequency, and at the same time conducting the semiconductor switch connected in parallel with the DC voltage conversion circuit at rest to invert the polarity of the current flowing through the discharge lamp. A discharge lamp lighting device having a diode inserted in parallel with the semiconductor switch.

A discharge lamp lighting device according to a sixteenth aspect of the present invention is a discharge lamp, a DC voltage conversion circuit connected to both ends of the discharge lamp, a semiconductor switch connected in parallel with the DC voltage conversion circuit, and the DC voltage. And a means for alternately outputting the conversion circuit in synchronization with a low frequency, and at the same time conducting the semiconductor switch connected in parallel with the DC voltage conversion circuit at rest to invert the polarity of the current flowing through the discharge lamp. The discharge lamp lighting device further comprises means for operating the semiconductor switch added to the DC voltage conversion circuit at a fixed frequency and a fixed duty for a predetermined time from the standby state immediately after the discharge lamp is turned on.

According to a seventeenth aspect of the present invention, in a discharge lamp lighting device, a discharge lamp, a DC voltage conversion circuit connected to both ends of the discharge lamp, a semiconductor switch connected in parallel with the DC voltage conversion circuit, and the DC voltage. And a means for alternately outputting the conversion circuit in synchronization with a low frequency, and at the same time conducting the semiconductor switch connected in parallel with the DC voltage conversion circuit at rest to invert the polarity of the current flowing through the discharge lamp. The discharge lamp lighting device further includes means for operating the semiconductor switch at a low frequency for a predetermined time from a standby state immediately after powering on the discharge lamp.

According to another aspect of the present invention, there is provided a discharge lamp lighting device, a discharge lamp, a DC voltage conversion circuit connected to both ends of the discharge lamp, a semiconductor switch connected in parallel with the DC voltage conversion circuit, and the DC voltage. And a means for alternately outputting the conversion circuit in synchronization with a low frequency, and at the same time conducting the semiconductor switch connected in parallel with the DC voltage conversion circuit at rest to invert the polarity of the current flowing through the discharge lamp. The discharge lamp lighting device further comprises means for increasing the on-duty of the semiconductor switch added to the DC boost for a predetermined time immediately after the discharge is detected.

A discharge lamp lighting device according to a nineteenth aspect of the present invention is provided with a flyback type DC-DC converter that performs a one-volt voltage resonance operation as a DC voltage conversion circuit, and controls the on-duty of a switching element of this converter.
The output voltage suitable for the discharge lamp voltage is supplied.

[0027]

The discharge lamp lighting device according to the first aspect of the present invention does not use an inverter circuit and simply switches the switch in synchronization with lighting or extinguishing operation or an ultra-low frequency signal. Therefore, the structure is simple and the cost is low.

In the discharge lamp lighting device according to the second aspect, the polarity of the output of the DC voltage conversion circuit is switched and the output is supplied to the high pressure discharge lamp.

In the discharge lamp lighting device of the third aspect, the output polarity is switched in synchronization with the lighting and extinguishing operations.

In the discharge lamp lighting device according to the fourth aspect, the output polarity is switched in synchronization with the ultra low frequency signal or the low frequency signal.

In the discharge lamp lighting device according to the fifth aspect, the rising of the DC voltage conversion circuit can be accelerated.

In the discharge lamp lighting device according to the sixth aspect, the rising of the DC voltage conversion circuit can be accelerated.

In the discharge lamp lighting device according to the seventh aspect, it is possible to prevent an excessive short-circuit current from flowing through the semiconductor switches connected in parallel with the DC voltage conversion circuit.

The discharge lamp lighting device according to claim 8 prevents an excessive short-circuit current from flowing through the semiconductor switches connected in parallel to the DC voltage conversion circuit, and effectively uses energy to improve the efficiency of the lighting device. You can

In the discharge lamp lighting device according to the ninth aspect of the present invention, the efficiency of the lighting device can be improved by speeding up the rise of the DC voltage conversion circuit and by effectively using energy.

According to the discharge lamp lighting device of the tenth aspect, the efficiency of the lighting device can be improved by effectively using energy.

In the discharge lamp lighting device according to the eleventh aspect, some parts of the two DC voltage conversion circuits can be shared, so that the cost can be reduced.

According to the twelfth aspect of the discharge lamp lighting device, the operation from the dielectric breakdown to the lighting of the discharge lamp can be easily performed.

In the discharge lamp lighting device according to the thirteenth aspect, the rising of the DC voltage conversion circuit can be accelerated.

According to the fourteenth aspect of the discharge lamp lighting device of the present invention, the rise of the DC voltage conversion circuit can be accelerated, and the discharge lamp can generate the standby voltage necessary for starting the discharge.

In the discharge lamp lighting device according to the fifteenth aspect, the rising of the DC voltage converting circuit can be accelerated.

The discharge lamp lighting device according to the sixteenth aspect can use a semiconductor switch having a low breakdown voltage, and the efficiency of the lighting device can be improved.

In the discharge lamp lighting device according to the seventeenth aspect, since the low frequency lighting is performed for a predetermined time after lighting from the standby state, extinction can be prevented.

The discharge lamp lighting device according to the eighteenth aspect can prevent the lamp from going out.

The discharge lamp lighting device according to the nineteenth aspect can appropriately control the output voltage value of the DC voltage conversion circuit when applying the voltage necessary for the discharge lamp.

[0046]

【Example】

Example 1. FIG. 1 is a conceptual diagram of a “high pressure discharge lamp lighting device” according to a first embodiment. The output polarity of the DC power supply 3 is alternately switched by the interlocking switches 9a and 9b to supply the high-pressure discharge lamp 6.

FIG. 2 is a block diagram showing the configuration of the first embodiment, and FIG. 3 is a flow chart showing its operation. As shown in FIG. 3, a polarity switching circuit (switch driving means)
A switch 8 which is a relay contact detects a turning-on of the lighting switch 2, and reverses the energizing state of a relay (not shown).
a and 9b are driven to alternately switch the output polarity of the DC voltage conversion circuit 3 in synchronization with turning on and off, and the high-voltage discharge lamp 6
Supply to. It should be noted that as the synchronization method, methods such as ON → OFF detection of the lighting switch 2, ON / OFF detection, and other appropriate signal detection regarding lighting and extinction can be used. The other code parts function in the same manner as the same code part of the first conventional example.

FIG. 4 is a timing chart of a modification of this embodiment. As shown in the figure, the polarity switching circuit 8 inverts the energizing state of the relay, for example, every 10 minutes by the signal of the built-in ultra-low frequency oscillator, regardless of whether the lighting switch 2 is on or off, and the DC voltage conversion circuit 3 The output polarity is alternately switched to supply to the high pressure discharge lamp 6.

As described above, in this embodiment, since the inverter circuit is not used and the switches are switched in synchronization with the lighting and extinguishing operations or the ultra low frequency signal, the structure is simple and the cost is low.

Example 2. FIG. 5 is a conceptual diagram of the second embodiment, and FIG. 6 is a block diagram of the same embodiment. In this embodiment, the outputs of the DC voltage conversion circuits 3a and 3b having different output polarities are alternately switched by the switch 9c and supplied to the high pressure discharge lamp 6. The configuration and operation of the polarity switching circuit 8 are the same as in the first embodiment. With this embodiment, the same effect as that of the first embodiment can be obtained.

Example 3. FIG. 7 is a conceptual diagram of the third embodiment, and FIG. 8 is a block diagram of the same embodiment. Reference numerals 3a and 3b are direct-current voltage conversion circuits, which have the same configuration and operation as the direct-current voltage conversion circuits 3a and 3b of the second embodiment. Reference numerals 4a and 4b are switches composed of switching elements such as transistors.
Although not shown in the figure, the DC power supply 1 supplies power to the DC voltage conversion circuits 3a and 3b.

FIG. 9 is a timing chart showing the operation of each block shown in FIG. 8, and 1 is the output waveform of the DC voltage conversion circuit 3a. The DC voltage conversion circuit 3a intermittently outputs the voltage E1 [V] at a low frequency. 2 is a DC voltage conversion circuit 3
The output waveform of b is similar to 1. 3 is O of switch 4a
N / OFF state, 4 indicates an ON / OFF state of the switch 4b, and the switch 4b is in operation while the DC voltage conversion circuit 3a is outputting.
Is on and the switch 4a is on during the output of the DC voltage conversion circuit 3b.
Turns on. Reference numeral 5 indicates the voltage applied to the high pressure discharge lamp 6.

FIG. 10 shows the DC voltage conversion circuit 3 in FIG.
a, 3b and switches 4a, 4b show an example of a concrete circuit configuration, and FIG. 11 shows a timing chart thereof. By the signal from the control circuit 7-3, as shown in FIG.
The transistor 33a and the transistor 33b alternately turn on and off high frequency switching (for example, 20 KHz), and
The transistor 4a is turned on during the high frequency switching of the transistor 33b, and the transistor 4b is turned on.
a turns on during high frequency switching. Therefore,
The output voltage of the DC voltage conversion circuit 3a causes a current to flow in the closed circuit of the coil 10a, the high pressure discharge lamp 6, the coil 10b, the resistor 62 and the transistor 4b. Resistor 62 operates to limit its current. Similarly, the DC voltage conversion circuit 3
The output voltage of b causes a current to flow in the closed circuit of the coil 10b, the high pressure discharge lamp 6, the coil 10a, the resistor 61 and the transistor 4a. That is, the high pressure discharge lamp 6 has a structure shown in FIG.
The low frequency AC voltage is supplied as shown in No. 7. By the way, the DC voltage conversion circuits 3a and 3b shown in FIG.
It is composed of a single-stone voltage resonance type converter using 3a and 33b, and voltage conversion with less loss is possible. In the present invention, when the load is a high-pressure discharge lamp, the load voltage (discharge lamp voltage) is low immediately after the start of discharge and reaches a steady value after a certain time has elapsed. Therefore, the DC voltage conversion circuit is required to have a characteristic capable of changing its output voltage. Therefore, as in the present embodiment, if the configuration of the flyback type (supplying the energy accumulated when the transistor 33a is on to the load when the transistor 33a is on) is used by using the transformers 32a and 32b, the output supply power (current) to the load The output voltage value can be changed, which is convenient for load-control. In particular, when the discharge lamp is in a standby state in which discharge has not yet started, almost no load current flows, and since the output voltage of the DC voltage conversion circuit can be increased, it is possible to ensure the discharge start of the discharge lamp. Was found. The control of the output voltage value can be realized by changing the ON period ratio (ON duty) of the transistors 33a and 33b as already known in this main DC-DC converter.

DC voltage conversion circuits 3a, 3 shown in FIG.
If one end of the output of b can be floated from the ground point, the third embodiment can be modified as shown in the conceptual diagram of FIG.

Thus, according to this embodiment as well,
The same effect as that of the first embodiment can be obtained.

In the first and second embodiments, the switch is turned on and off or is operated in synchronization with the ultra low frequency signal, and in the third embodiment, the switch is operated in synchronization with the low frequency signal. However, the present invention is not limited to this, and the switches of the first and second embodiments are operated in synchronization with the low frequency signal, and the switches of the third embodiment are turned on and off or synchronized with the ultra low frequency signal. It can also be implemented in the form of being operated.

Further, in the configurations of FIGS. 5 and 12, a part of the DC voltage conversion circuits 3a and 3b, for example, the primary side of the transformer can be shared.

Example 4. FIG. 13 is a schematic diagram showing the entire high pressure discharge lamp according to the fourth embodiment of the present invention. 14
FIG. 7 is a timing chart diagram for explaining the operation of the present invention. The high voltage generated in the igniter circuit 5-1 is applied to the high-pressure discharge lamp 6 to cause dielectric breakdown of the enclosed gas in the high-pressure discharge lamp 6, and the DC voltage conversion circuit 3a and the semiconductor switch S4 are combined into a single DC voltage conversion circuit. Circuit 3b and semiconductor switch S3
AC power can be supplied to the discharge lamp 6 by alternately operating these two sets as the other set. Here, the operation signals of the semiconductor switches S3 and S4 are the discharge lamp 6
A low-frequency signal synchronized with the frequency of the AC power supplied to
Semiconductor switches S1 in the DC voltage conversion circuits 3a and 3b,
S2 switches at a high frequency to boost the DC power supply voltage to a predetermined voltage during the period in which the voltage is output from the DC voltage conversion circuits 3a and 3b. However, there is a delay time from the start of the switching operation of the semiconductor switch in the DC voltage conversion circuit until the predetermined voltage is output to the DC voltage conversion circuit. Therefore, as shown in FIG. 14, in consideration of the rising delay of the output voltage of the DC voltage conversion circuit, high frequency switching of the semiconductor switches in the DC voltage conversion circuit is started a predetermined time before the semiconductor switches of the same set are turned on. .

Example 5. FIG. 15 is a timing chart illustrating the operation of the fifth embodiment. The basic operation is the same as in the fourth embodiment. Here, the ON period of the semiconductor switch in the DC voltage conversion circuit is set to be longer than the ON period for outputting a predetermined voltage to the DC voltage conversion circuit after the high frequency switching is started. As a result, immediately after the start of high-frequency switching, a voltage higher than usual is generated on the secondary side of the transformer, the charging time of the smoothing capacitor is shortened, and the rise of the output voltage of the DC voltage conversion circuit is accelerated.

Example 6. 16 and 17 are schematic configuration diagrams of an entire high pressure discharge lamp according to a sixth embodiment of the present invention.
The basic operation is the same as in the fourth embodiment. In FIG. 16, coils L1 and L are provided between the discharge lamp and the semiconductor switches S3 and S4.
Since the two capacitors are arranged, when the semiconductor switch connected in parallel to the DC voltage conversion circuit is turned on, the electric charge stored in the smoothing capacitor is suppressed by the coils L1 and L2 from an excessive short-circuit current flowing through the semiconductor switch. As a result, the current capacity of the semiconductor switches S3 and S4 can be reduced, and the cost can be reduced. Further, when the smoothing capacitors C1 and C2 and the coils L1 and L2 are arranged after the semiconductor switches S3 and S4 as shown in FIG. 17, the coils L1 and L2 are the same as in the case of FIG.
In addition to preventing the short-circuit current flowing through S3 and S4, the smoothing circuit portion of the DC voltage conversion circuit becomes a choke input type composed of a coil and a capacitor, and peak current suppression can be achieved.

Example 7. FIG. 18 is a timing chart illustrating the operation of the seventh embodiment. The basic operation is the same as in the fourth embodiment. Here, even if the high frequency switching operation of the DC voltage conversion circuit is stopped, electric charges are stored in the smoothing capacitor. This electric charge flows through the semiconductor switch as ON and short-circuit current through the semiconductor switch connected in parallel to the DC voltage conversion circuit without passing through the discharge lamp.Therefore, an excessive short-circuit current may flow in the semiconductor switch, and the discharge lamp lighting device Is also inefficient. Therefore, the high-frequency switching operation of the semiconductor switches in the DC voltage conversion circuit is stopped before the semiconductor switches of the same set are turned off, and the electric charge accumulated in the smoothing capacitor is discharged through the discharge lamp. As a result, the semiconductor switch S
The current capacity of S3 and S4 can be reduced and the cost can be reduced, and the electric charge accumulated in the smoothing capacitor is passed to the discharge lamp, so that the energy is effectively used and the efficiency is improved.

Example 8. FIG. 19 is a timing chart diagram for explaining the operation of the eighteenth embodiment. However, since the pair of the DC voltage conversion circuit 3a and the semiconductor switch S4 and the pair of the DC voltage conversion circuit 3b and the semiconductor switch S3 perform the same operation, the DC voltage conversion circuit 3a and the semiconductor switch S4.
FIG. 3 is a timing chart diagram only for the pair. The basic operation is the same as in the fourth embodiment. Here, a current IC flows through the transformer while the semiconductor switch in the DC voltage conversion circuit 3a is on, and energy is stored in the primary side of the transformer. While the semiconductor switch is off, the energy stored in the transformer is discharged through the diode D1. At this time, a rectangular wave voltage boosted according to the turns ratio of the transformer appears on the secondary side of the transformer. This sine wave voltage is smoothed by the capacitor C1. DC voltage conversion circuit 3
Since the semiconductor switch in a transfers energy to the secondary side during the OFF period, the semiconductor switch S4 paired with the DC voltage conversion circuit 3a is turned off in synchronization with the rising signal of the semiconductor switching element of the DC voltage conversion circuit 3a. . Similarly, the semiconductor switch S3 paired with the DC voltage conversion circuit 3b is turned off in synchronization with the rising signal of the semiconductor switch of the DC voltage conversion circuit 3b. As a result, the semiconductor switch S4 is turned off after the energy transmitted to the secondary side is supplied to the discharge lamp via the capacitor C1, so that a high-efficiency discharge lamp with less energy loss can be provided.

Example 9. FIG. 20 is a schematic view showing the entire high pressure discharge lamp according to the ninth embodiment of the present invention. The basic operation is the same as in the fourth embodiment. Since the transformer T3 having the same winding ratio is arranged between the discharge lamp 6 and the semiconductor switches S3 and S4 as shown in the figure, the semiconductor switch in the DC voltage conversion circuit stops high frequency switching, and the DC voltage conversion circuit When the semiconductor switch connected in parallel with is turned on, the electric charge accumulated in the smoothing capacitor of the DC voltage conversion circuit is discharged through the transformer T3 and the semiconductor switch connected in parallel with the DC voltage conversion circuit. At this time, a voltage is generated on the opposite side through the transformer T3. Since the transformer T3 is wound in the winding direction so that the voltage generated by the transformer T3 charges the smoothing capacitor of the DC voltage conversion circuit on the opposite side, the rise of the DC voltage conversion circuit can be accelerated.

Example 10. FIG. 21 shows the first embodiment of the present invention.
It is a block diagram which shows schematically the whole high pressure discharge lamp by 0. The basic operation is the same as in the fourth embodiment. Here, the discharge lamp 6
When the capacitor C3 is arranged in parallel with the capacitor C3, the voltage of the capacitor C3 is output, and the terminal on the opposite side of the DC voltage conversion circuit is grounded via the semiconductor switch. Therefore, the capacitor C3 outputs the DC voltage. Acts as a smoothing capacitor for the conversion circuit. That is,
Two DC voltage conversion circuits 3a arranged at both ends of the discharge lamp,
The smoothing condenser of 3b needs only one condenser.

Example 11. 22 and 23 show Example 11
3 is a timing chart diagram for explaining the operation of FIG. The basic operation is the same as in the fourth embodiment. Here, the turn ratio of the step-up transformer in one DC voltage conversion circuit arranged at both ends of the discharge lamp 6 is made larger than the turn ratio of the step-up transformer in the other DC voltage conversion circuit, and the DC voltage conversion circuit If the ON periods of the semiconductor switches therein are the same, one of the DC voltage conversion circuits can generate a higher voltage. When a high voltage is applied to the discharge lamp 6 by the igniter 5-1 for dielectric breakdown, a DC voltage conversion circuit with a high step-up ratio outputs a voltage higher than the voltage for keeping the discharge lamp lit, and the other side. The DC voltage conversion circuit of is stopped and maintained. Further, when the DC power supply voltage VB drops below a predetermined value, only the DC voltage conversion circuit with a high step-up ratio is operated and the discharge lamp is lit with DC.

Example 12 FIG. 24 shows the first embodiment of the present invention.
It is a block diagram which shows schematically the whole high pressure discharge lamp by 2. FIG. 25 is a timing chart illustrating the operation of the present invention. The basic operation is the same as in the fourth embodiment. Here, there is a delay time from the start of the switching operation of the semiconductor switch in the DC voltage conversion circuit to the appearance of a predetermined voltage in the DC voltage conversion circuit. Therefore, as shown in FIG. 25, the ON signal of the semiconductor switch S4 is delayed by the ON width of the semiconductor switch S1 in the DC voltage conversion circuit 3a,
In synchronization with the fall, the semiconductor switch S4 is turned on, and at the same time, the resonance voltage of the semiconductor switch S1 is boosted by T1 to charge the output smoothing capacitor C1. Similarly, the ON signal of the semiconductor switch S3 is delayed by the ON width of the semiconductor switch S2 in the DC voltage conversion circuit 3b and is synchronized with the falling edge thereof, and the semiconductor switch S3 is turned on, and at the same time, the resonance voltage of the semiconductor switch S2 is changed by T2. The voltage is boosted and the output smoothing capacitor C2 is charged. Thereby, the semiconductor switch S1 or the semiconductor switch S2
Since the electric charge is stored in the capacitor at the same time as when is turned on, the rise of the DC voltage conversion circuit can be accelerated.

Example 13 FIG. 26 shows a first embodiment of the present invention.
3 is a configuration diagram schematically showing the entire high pressure discharge lamp according to FIG. The basic operation is the same as in the ninth embodiment. Immediately after turning on the discharge lamp power, for example, by turning off the semiconductor switch S3 and switching the semiconductor switch S4 at high speed, a high voltage is generated on the semiconductor switch S3 side of the transformer T3, and the parasitic diode D5 of the semiconductor switch S3 causes After being rectified, the output smoothing capacitor C1 is charged with a high voltage necessary for starting discharge. Similarly, by turning off the semiconductor switch S4 and performing high-speed switching of the semiconductor switch S3, the semiconductor switch S4 of the transformer T3 is changed.
A high voltage is generated on the side, is rectified by the parasitic diode D6 of the semiconductor switch S4, and the output smoothing capacitor C2 is charged with the high voltage required to start discharge. As a result, the rise of the DC voltage conversion circuit can be accelerated and the discharge lamp can generate the standby voltage necessary for starting the discharge.

Example 14 FIG. 27 shows the first embodiment of the present invention.
4 is a configuration diagram schematically showing the entire high pressure discharge lamp according to FIG. The basic operation is the same as in the fourth embodiment. Here, the diode D5 is arranged in parallel with the semiconductor switch S3, and the diode D6 is arranged in parallel with the semiconductor switch S4 in the direction shown in FIG. 31, and a required pause period is provided when the polarities of the semiconductor switches S3 and S4 are switched. Therefore, by using this idle period, for example, the electric charge accumulated in the output smoothing capacitor C1 in the DC voltage converting circuit 3a is passed through the diode D5, and the DC voltage converting circuit 3b whose electric charge was zero before that time.
The output smoothing capacitor C2 therein is charged. Similarly, the charge stored in the output smoothing capacitor C2 in the DC voltage conversion circuit 3b is charged through the diode D6 to the output smoothing capacitor C1 in the DC voltage conversion circuit 3a, which was previously zero. . As a result, it is possible to speed up the rise of the DC voltage conversion circuit.

Example 15 FIG. 28 shows the first embodiment of the present invention.
FIG. 6 is a configuration diagram schematically illustrating the entire high pressure discharge lamp according to the fifth embodiment. The basic operation is the same as in the fourth embodiment. Here, a resonance capacitor C3 is arranged in parallel with the primary side of the transformer T1 in the DC voltage conversion circuit 3a, and a resonance capacitor C4 is arranged in parallel with the primary side of the transformer T2 in the DC voltage conversion circuit 3b. For a predetermined time after the power is turned on, the peak value of the resonance voltage applied between the drain and the source of the semiconductor switch S1 and the semiconductor switch S2 is suppressed, so that the zero point detection is not performed and the operation is performed at the fixed frequency and the fixed duty. I do. As a result, a semiconductor switch having a low breakdown voltage can be used, and the efficiency of the lighting device can be improved.

Example 16. FIG. 29 shows the first embodiment of the present invention.
6 is a configuration diagram schematically showing an entire high pressure discharge lamp according to FIG. The basic operation is the same as in the fourth embodiment. Here, the semiconductor switch S1 and the semiconductor switch S2 are operated at a low frequency for a predetermined time after lighting from the standby state immediately after the power is turned on. As a result, it is possible to prevent fading when switching the polarities.

Example 17 FIG. 30 shows the first embodiment of the present invention.
It is a block diagram which shows schematically the whole high pressure discharge lamp by 2. FIG. 31 is a timing chart illustrating the operation of the present invention. The basic operation is the same as in the fourth embodiment. Here, the state of the atmosphere in the discharge lamp tube is unstable for a predetermined time immediately after the discharge is detected, and there is a possibility that the discharge lamp tube may disappear when switching the polarity. Therefore, the semiconductor switches S in the DC voltage conversion circuits 3a and 3b are provided for a predetermined time immediately after the discharge detection.
It is possible to prevent disappearance by increasing the on-duty of S3 and S4.

The above embodiments may be used individually or in combination. Further, although the high-pressure discharge lamp is described in the above embodiment, the present invention can be applied to discharge lamps other than the high-pressure discharge lamp. Furthermore, an example of a concrete DC voltage conversion circuit is shown in FIG.
Of course, the present invention is not limited to this, and other configurations capable of supplying desired power may be used. Further, the semiconductor switches S1 to S4 are bipolar transistors and POWER.
MON FETs and other elements can be used.

[0073]

According to the first aspect of the present invention, there is provided a high voltage discharge lamp lighting device which drives a direct current voltage conversion circuit, a switch for switching the polarity of the output of the direct current voltage conversion circuit to supply the high pressure discharge lamp, and the switch. Since the switch driving means is provided, only the switch is switched in synchronization with the lighting or extinguishing operation or the ultra-low frequency signal without using the inverter circuit, so that the structure is simple and the cost is low.

A high pressure discharge lamp lighting device according to a second aspect of the present invention includes a first DC current conversion circuit, a second DC voltage conversion circuit, an output of the first DC voltage conversion circuit, and the second DC voltage conversion circuit. Since the output of the circuit is selected so that the output polarity alternates and is supplied to the high-pressure discharge lamp, and the switch drive means for driving this switch is provided, the output of the DC voltage conversion circuit is , The polarity of which is switched to be supplied to the high pressure discharge lamp.

A high pressure discharge lamp lighting device according to a third aspect of the present invention is the high pressure discharge lamp lighting device refrigerant distributor according to the first or second aspect, wherein the switch driving means operates in synchronization with lighting and extinguishing operations. Therefore, the output polarity is switched in synchronization with the lighting and extinguishing operations.

A high pressure discharge lamp lighting device according to claim 4 is the high pressure discharge lamp lighting device according to claim 1 or 2.
Since the switch driving means is configured to operate in synchronization with the ultra low frequency signal or the low frequency signal, the output polarity is switched in synchronization with the ultra low frequency signal or the low frequency signal.

The discharge lamp lighting device according to claim 5 is a discharge lamp,
A direct current voltage conversion circuit connected to both ends of the discharge lamp, a semiconductor switch connected in parallel with the direct current voltage conversion circuit, and the direct current voltage conversion circuit are alternately output in synchronization with a low frequency, and are simultaneously suspended. A discharge lamp lighting device comprising means for conducting the semiconductor switch connected in parallel with the DC voltage conversion circuit to invert the polarity of the current flowing in the discharge lamp, and a predetermined output voltage of the DC voltage conversion circuit. Since the configuration is such that the signal for outputting the voltage is provided for a predetermined time earlier than the ON signal of the semiconductor switch on the opposite side of the discharge lamp, it is possible to accelerate the rise of the DC voltage conversion circuit. .

A discharge lamp lighting device according to claim 6 is a discharge lamp,
A direct current voltage conversion circuit connected to both ends of the discharge lamp, a semiconductor switch connected in parallel with the direct current voltage conversion circuit, and the direct current voltage conversion circuit are alternately output in synchronization with a low frequency, and are simultaneously suspended. In a discharge lamp lighting device having means for conducting the semiconductor switch connected in parallel with the DC voltage conversion circuit to reverse the polarity of the current flowing in the discharge lamp, a predetermined time period immediately after the semiconductor switch is turned on. Has a means for increasing the on-duty of the high-frequency switching signal in the DC voltage conversion circuit on the opposite side of the discharge lamp, so that the DC voltage conversion circuit can be started up quickly.

The discharge lamp lighting device according to claim 7 is a discharge lamp,
A direct current voltage conversion circuit connected to both ends of the discharge lamp, a semiconductor switch connected in parallel with the direct current voltage conversion circuit, and the direct current voltage conversion circuit are alternately output in synchronization with a low frequency, and are simultaneously suspended. A discharge lamp lighting device comprising means for electrically connecting the semiconductor switch connected in parallel with the DC voltage conversion circuit to reverse the polarity of the current flowing in the discharge lamp, between the discharge lamp and the semiconductor switch. Since the configuration includes the inserted coil, it is possible to prevent an excessive short-circuit current from flowing through the semiconductor switch connected in parallel with the DC voltage conversion circuit.

The discharge lamp lighting device according to claim 8 is a discharge lamp,
A direct current voltage conversion circuit connected to both ends of the discharge lamp, a semiconductor switch connected in parallel with the direct current voltage conversion circuit, and the direct current voltage conversion circuit are alternately output in synchronization with a low frequency, and are simultaneously suspended. A discharge lamp lighting device comprising means for conducting the semiconductor switch connected in parallel with the DC voltage conversion circuit to invert the polarity of the current flowing in the discharge lamp, and a predetermined output voltage of the DC voltage conversion circuit. The semiconductor switch connected in parallel to the DC voltage conversion circuit is provided with a means for extinguishing the signal for outputting the voltage earlier than the OFF signal of the semiconductor switch on the opposite side across the discharge lamp by a predetermined time. It is possible to prevent an excessive short-circuit current from flowing through.

The discharge lamp lighting device according to claim 9 is a discharge lamp,
A direct current voltage conversion circuit connected to both ends of the discharge lamp, a semiconductor switch connected in parallel with the direct current voltage conversion circuit, and the direct current voltage conversion circuit are alternately output in synchronization with a low frequency, and are simultaneously suspended. In the discharge lamp lighting device, the semiconductor switch connected in parallel with the direct current voltage conversion circuit is turned on to reverse the polarity of the current flowing through the discharge lamp. Since the structure is provided with the means for synchronizing with the rising of the high frequency switching signal in the DC voltage conversion circuit on the opposite side across the light, the DC voltage conversion circuit can be started up quickly and energy can be used effectively. The efficiency of the lighting device can be improved.

According to a tenth aspect of the present invention, there is provided a discharge lamp lighting device, a discharge lamp, a DC voltage conversion circuit connected to both ends of the discharge lamp, a semiconductor switch connected in parallel with the DC voltage conversion circuit, and the DC voltage. And a means for alternately outputting the conversion circuit in synchronization with a low frequency, and at the same time conducting the semiconductor switch connected in parallel with the DC voltage conversion circuit at rest to invert the polarity of the current flowing through the discharge lamp. In the discharge lamp lighting device, since the transformer provided between the discharge lamp and the semiconductor switch is provided, the efficiency of the lighting device can be improved by effectively using energy.

The discharge lamp lighting device according to claim 11 is a discharge lamp, a DC voltage conversion circuit connected to both ends of the discharge lamp, a semiconductor switch connected in parallel with the DC voltage conversion circuit, and the DC voltage. And a means for alternately outputting the conversion circuit in synchronization with a low frequency, and at the same time conducting the semiconductor switch connected in parallel with the DC voltage conversion circuit at rest to invert the polarity of the current flowing through the discharge lamp. In the discharge lamp lighting device described above, since the smoothing capacitors provided at both ends of the discharge lamp and shared by the DC voltage conversion circuit are provided, some parts of the two DC voltage change circuits can be shared. Therefore, the cost can be reduced.

According to a twelfth aspect of the present invention, there is provided a discharge lamp lighting device, a discharge lamp, a DC voltage conversion circuit connected to both ends of the discharge lamp, a semiconductor switch connected in parallel with the DC voltage conversion circuit, and the DC voltage. And a means for alternately outputting the conversion circuit in synchronization with a low frequency, and at the same time conducting the semiconductor switch connected in parallel with the DC voltage conversion circuit at rest to invert the polarity of the current flowing through the discharge lamp. In the discharge lamp lighting device described above, the DC voltage conversion circuit makes the number of turns of one step-up transformer larger than the number of turns of the other step-up transformer to perform dielectric breakdown of the discharge lamp, and when the DC power supply voltage is below a predetermined value. When this happens, the DC voltage conversion circuit that has a step-up transformer with a large number of turns is driven, so it is possible to easily perform the operations from insulation breakdown to lighting of the discharge lamp. .

A discharge lamp lighting device according to a thirteenth aspect of the present invention is a discharge lamp, a DC voltage conversion circuit connected to both ends of the discharge lamp, a semiconductor switch connected in parallel with the DC voltage conversion circuit, and the DC voltage. And a means for alternately outputting the conversion circuit in synchronization with a low frequency, and at the same time conducting the semiconductor switch connected in parallel with the DC voltage conversion circuit at rest to invert the polarity of the current flowing through the discharge lamp. In the discharge lamp lighting device, since the ON signal of the semiconductor switch is configured to include means for synchronizing with the fall of the high frequency switching signal in the DC voltage conversion circuit on the opposite side across the discharge lamp, It is possible to speed up the rise of the DC voltage conversion circuit.

According to a fourteenth aspect of the present invention, in a discharge lamp lighting device, a discharge lamp, a DC voltage conversion circuit connected to both ends of the discharge lamp, a semiconductor switch connected in parallel with the DC voltage conversion circuit, and the DC voltage. And a means for alternately outputting the conversion circuit in synchronization with a low frequency, and at the same time conducting the semiconductor switch connected in parallel with the DC voltage conversion circuit at rest to invert the polarity of the current flowing through the discharge lamp. In the discharge lamp lighting device, since the transformer provided between the discharge lamp and the semiconductor switch is provided, the DC voltage conversion circuit rises faster and the discharge lamp requires a standby voltage required for starting discharge. Can occur.

According to a fifteenth aspect of the present invention, there is provided a discharge lamp lighting device, a discharge lamp, a DC voltage conversion circuit connected to both ends of the discharge lamp, a semiconductor switch connected in parallel with the DC voltage conversion circuit, and the DC voltage. And a means for alternately outputting the conversion circuit in synchronization with a low frequency, and at the same time conducting the semiconductor switch connected in parallel with the DC voltage conversion circuit at rest to invert the polarity of the current flowing through the discharge lamp. In the discharge lamp lighting device, since the diode is inserted in parallel with the semiconductor switch, the rise of the DC voltage conversion circuit can be accelerated.

According to a sixteenth aspect of the present invention, there is provided a discharge lamp lighting device, a discharge lamp, a DC voltage conversion circuit connected to both ends of the discharge lamp, a semiconductor switch connected in parallel with the DC voltage conversion circuit, and the DC voltage. And a means for alternately outputting the conversion circuit in synchronization with a low frequency, and at the same time conducting the semiconductor switch connected in parallel with the DC voltage conversion circuit at rest to invert the polarity of the current flowing through the discharge lamp. In the discharge lamp lighting device, since the semiconductor switch added to the DC voltage conversion circuit is provided with a means for operating at a fixed frequency and a fixed duty for a predetermined time from the standby state immediately after the discharge lamp is powered on, The efficiency of the lighting device can be improved by using a semiconductor switch having a low power consumption.

According to a seventeenth aspect of the present invention, there is provided a discharge lamp lighting device, a discharge lamp, a DC voltage conversion circuit connected to both ends of the discharge lamp, a semiconductor switch connected in parallel with the DC voltage conversion circuit, and the DC voltage. And a means for alternately outputting the conversion circuit in synchronization with a low frequency, and at the same time conducting the semiconductor switch connected in parallel with the DC voltage conversion circuit at rest to invert the polarity of the current flowing through the discharge lamp. In the discharge lamp lighting device, the discharge lamp lighting device is configured to include a means for operating the semiconductor switch at a low frequency for a predetermined time from a standby state immediately after the power supply of the discharge lamp is turned on. Since the low frequency lighting is performed, it is possible to prevent the light from disappearing.

The discharge lamp lighting device according to claim 18 is a discharge lamp, a DC voltage conversion circuit connected to both ends of the discharge lamp, a semiconductor switch connected in parallel with the DC voltage conversion circuit, and the DC voltage. And a means for alternately outputting the conversion circuit in synchronization with a low frequency, and at the same time conducting the semiconductor switch connected in parallel with the DC voltage conversion circuit at rest to invert the polarity of the current flowing through the discharge lamp. In the discharge lamp lighting device, the means for increasing the on-duty of the semiconductor switch added to the DC booster circuit is provided for a predetermined time immediately after the discharge is detected, so that the discharge lamp 6 can be prevented from extinguishing. .

In the discharge lamp lighting device according to the nineteenth aspect, since the flyback converter of the one-stone voltage resonance is used for the DC voltage conversion circuit, it becomes easy to appropriately control the voltage change (power change) of the load. .

[Brief description of drawings]

FIG. 1 is a conceptual diagram of a high pressure discharge lamp lighting device according to a first embodiment of the present invention.

FIG. 2 is a block diagram of a high pressure discharge lamp lighting device according to Embodiment 1 of the present invention.

FIG. 3 is a flowchart of the high pressure discharge lamp lighting device according to the first embodiment of the present invention.

FIG. 4 is a timing chart of a high pressure discharge lamp lighting device according to a modification of the first embodiment of the present invention.

FIG. 5 is a conceptual diagram of a high pressure discharge lamp lighting device according to a second embodiment of the present invention.

FIG. 6 is a block diagram of a high pressure discharge lamp lighting device according to a second embodiment of the present invention.

FIG. 7 is a conceptual diagram of a high pressure discharge lamp lighting device according to a third embodiment of the present invention.

FIG. 8 is a block diagram of a high pressure discharge lamp lighting device according to a third embodiment of the present invention.

FIG. 9 is a timing chart of a high pressure discharge lamp lighting device according to a third embodiment of the present invention.

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

FIG. 11 is a timing chart of the high pressure discharge lamp lighting device according to the third embodiment of the present invention.

FIG. 12 is a conceptual diagram of a high pressure discharge lamp lighting device according to a modification of the third embodiment of the present invention.

FIG. 13 is a configuration diagram of a discharge lamp lighting device according to a fourth embodiment of the present invention.

FIG. 14 is a timing chart of the discharge lamp lighting device according to the fourth embodiment of the present invention.

FIG. 15 is a timing chart of the discharge lamp lighting device according to the fifth embodiment of the present invention.

FIG. 16 is a configuration diagram of a discharge lamp lighting device according to a sixth embodiment of the present invention.

FIG. 17 is a configuration diagram of a discharge lamp lighting device according to a sixth embodiment of the present invention.

FIG. 18 is a timing chart of the discharge lamp lighting device according to the seventh embodiment of the present invention.

FIG. 19 is a timing chart of the discharge lamp lighting device according to the eighth embodiment of the present invention.

FIG. 20 is a configuration diagram of a discharge lamp lighting device according to a ninth embodiment of the present invention.

FIG. 21 is a configuration diagram of a discharge lamp lighting device according to a tenth embodiment of the present invention.

FIG. 22 is a timing chart of the discharge lamp lighting device according to Embodiment 11 of the present invention.

FIG. 23 is a timing chart of the discharge lamp lighting device according to the eleventh embodiment of the present invention.

FIG. 24 is a configuration diagram of a discharge lamp lighting device according to a twelfth embodiment of the present invention.

FIG. 25 is a timing chart of a discharge lamp lighting device according to a twelfth embodiment of the present invention.

FIG. 26 is a configuration diagram of a discharge lamp lighting device according to a thirteenth embodiment of the present invention.

FIG. 27 is a configuration diagram of a discharge lamp lighting device according to a fourteenth embodiment of the present invention.

FIG. 28 is a configuration diagram of a discharge lamp lighting device according to a fifteenth embodiment of the present invention.

FIG. 29 is a configuration diagram of a discharge lamp lighting device according to Embodiment 16 of the present invention.

FIG. 30 is a configuration diagram of a discharge lamp lighting device according to a seventeenth embodiment of the present invention.

FIG. 31 is a timing chart of a discharge lamp lighting device according to a seventeenth embodiment of the present invention.

FIG. 32 is a block diagram of a conventional discharge lamp lighting device.

FIG. 33 is a block diagram of another conventional discharge lamp lighting device.

FIG. 34 is a circuit configuration diagram of another conventional discharge lamp lighting device.

FIG. 35 is a timing chart of another conventional discharge lamp lighting device.

[Explanation of symbols]

 3 DC voltage conversion circuit 3a DC voltage conversion circuit 3b DC voltage conversion circuit 4a switch 4b switch 5-1 igniter 6 discharge lamp 7-1 control circuit 8 polarity switching circuit 9a switch 9b switch 9c switch

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroyoshi Yamazaki 2-14-40 Ofuna, Kamakura-shi Mitsubishi Electric Corporation Life Systems Research Institute

Claims (19)

[Claims] 1. A direct current voltage conversion circuit, a switch for switching the polarity of the output of the direct current voltage conversion circuit to supply the high pressure discharge lamp, and a switch driving means for driving the switch. High pressure discharge lamp lighting device. 2. A first DC current conversion circuit, a second DC voltage conversion circuit, an output of the first DC voltage conversion circuit and an output of the second DC voltage conversion circuit, the output polarities of which are the same. A high-pressure discharge lamp lighting device, comprising: a switch that is alternately selected and supplies the high-pressure discharge lamp; and a switch driving unit that drives the switch. 3. The switch driving means operates in synchronization with lighting and extinguishing operations.
Alternatively, the high pressure discharge lamp lighting device according to claim 2. 4. The high pressure discharge lamp lighting device according to claim 1, wherein the switch driving means operates in synchronization with an ultra-low frequency signal or a low frequency signal. 5. A discharge lamp, a DC voltage conversion circuit connected to both ends of the discharge lamp, a semiconductor switch connected in parallel with the DC voltage conversion circuit, and the DC voltage conversion circuit synchronized with a low frequency. Alternately output, and at the same time, a means for conducting the semiconductor switch connected in parallel with the DC voltage conversion circuit at rest to reverse the polarity of the current flowing through the discharge lamp, in a discharge lamp lighting device, Discharge lamp lighting comprising means for outputting a signal for outputting a predetermined voltage to the output of the DC voltage conversion circuit earlier than the ON signal of the semiconductor switch on the opposite side across the discharge lamp by a predetermined time. apparatus. 6. A discharge lamp, a DC voltage conversion circuit connected to both ends of the discharge lamp, a semiconductor switch connected in parallel with the DC voltage conversion circuit, and the DC voltage conversion circuit synchronized with a low frequency. Alternately output, and at the same time, a means for conducting the semiconductor switch connected in parallel with the DC voltage conversion circuit at rest to reverse the polarity of the current flowing in the discharge lamp, in the discharge lamp lighting device, A discharge lamp lighting device comprising means for increasing an on-duty of a high frequency switching signal in the DC voltage conversion circuit on the opposite side of the discharge lamp for a predetermined time immediately after the semiconductor switch is turned on. 7. A discharge lamp, a DC voltage conversion circuit connected to both ends of the discharge lamp, a semiconductor switch connected in parallel with the DC voltage conversion circuit, and the DC voltage conversion circuit synchronized with a low frequency. Alternately output, and at the same time, a means for conducting the semiconductor switch connected in parallel with the DC voltage conversion circuit at rest to reverse the polarity of the current flowing in the discharge lamp, in the discharge lamp lighting device, A discharge lamp lighting device comprising a coil inserted between the discharge lamp and a semiconductor switch. 8. A discharge lamp, a DC voltage conversion circuit connected to both ends of the discharge lamp, a semiconductor switch connected in parallel with the DC voltage conversion circuit, and the DC voltage conversion circuit synchronized with a low frequency. Alternately output, and at the same time, a means for conducting the semiconductor switch connected in parallel with the DC voltage conversion circuit at rest to reverse the polarity of the current flowing in the discharge lamp, in the discharge lamp lighting device, Discharge lamp lighting comprising means for extinguishing a signal for outputting a predetermined voltage at the output of the DC voltage conversion circuit earlier than the OFF signal of the semiconductor switch on the opposite side of the discharge lamp by a predetermined time. apparatus. 9. A discharge lamp, a DC voltage conversion circuit connected to both ends of the discharge lamp, a semiconductor switch connected in parallel with the DC voltage conversion circuit, and the DC voltage conversion circuit synchronized with a low frequency. Alternately output, and at the same time, a means for conducting the semiconductor switch connected in parallel with the DC voltage conversion circuit at rest to reverse the polarity of the current flowing in the discharge lamp, in the discharge lamp lighting device, A discharge lamp lighting device comprising means for performing an OFF signal of a semiconductor switch in synchronization with a rising edge of a high frequency switching signal in the DC voltage conversion circuit on the opposite side of the discharge lamp. 10. A discharge lamp, a DC voltage conversion circuit connected to both ends of the discharge lamp, a semiconductor switch connected in parallel with the DC voltage conversion circuit, and the DC voltage conversion circuit synchronized with a low frequency. Alternately output, and at the same time, a means for conducting the semiconductor switch connected in parallel with the DC voltage conversion circuit at rest to reverse the polarity of the current flowing in the discharge lamp, in the discharge lamp lighting device, A discharge lamp lighting device comprising a transformer inserted between the discharge lamp and a semiconductor switch. 11. A discharge lamp, a DC voltage conversion circuit connected to both ends of the discharge lamp, a semiconductor switch connected in parallel with the DC voltage conversion circuit, and the DC voltage conversion circuit synchronized with a low frequency. Alternately output, and at the same time, a means for conducting the semiconductor switch connected in parallel with the DC voltage conversion circuit at rest to reverse the polarity of the current flowing in the discharge lamp, in the discharge lamp lighting device, A discharge lamp lighting device comprising a smoothing capacitor provided at both ends of the discharge lamp and shared by the DC voltage conversion circuit. 12. A discharge lamp, a DC voltage conversion circuit connected to both ends of the discharge lamp, a semiconductor switch connected in parallel with the DC voltage conversion circuit, and the DC voltage conversion circuit synchronized with a low frequency. Alternately output, and at the same time, a means for conducting the semiconductor switch connected in parallel with the DC voltage conversion circuit at rest to reverse the polarity of the current flowing in the discharge lamp, in the discharge lamp lighting device, The DC voltage conversion circuit makes the number of turns of one step-up transformer larger than the number of turns of the other step-up transformer to perform dielectric breakdown of the discharge lamp, or when the DC power supply voltage becomes a predetermined value or less,
A discharge lamp lighting device, characterized in that a DC voltage conversion circuit having a step-up transformer with a large number of turns is driven. 13. A discharge lamp, a DC voltage conversion circuit connected to both ends of the discharge lamp, a semiconductor switch connected in parallel with the DC voltage conversion circuit, and the DC voltage conversion circuit synchronized with a low frequency. Alternately output, and at the same time, a means for conducting the semiconductor switch connected in parallel with the DC voltage conversion circuit at rest to reverse the polarity of the current flowing through the discharge lamp, in a discharge lamp lighting device, A discharge lamp lighting device comprising means for making an ON signal of a semiconductor switch in synchronism with a falling edge of a high frequency switching signal in the DC voltage conversion circuit on the opposite side of the discharge lamp. 14. A discharge lamp, a DC voltage conversion circuit connected to both ends of the discharge lamp, a semiconductor switch connected in parallel with the DC voltage conversion circuit, and the DC voltage conversion circuit synchronized with a low frequency. Alternately output, and at the same time, a means for conducting the semiconductor switch connected in parallel with the DC voltage conversion circuit at rest to reverse the polarity of the current flowing in the discharge lamp, in the discharge lamp lighting device, A discharge lamp lighting device lamp device comprising a transformer inserted between the discharge lamp and a semiconductor switch. 15. A discharge lamp, a DC voltage conversion circuit connected to both ends of the discharge lamp, a semiconductor switch connected in parallel with the DC voltage conversion circuit, and the DC voltage conversion circuit synchronized with a low frequency. Alternately output, and at the same time, a means for conducting the semiconductor switch connected in parallel with the DC voltage conversion circuit at rest to reverse the polarity of the current flowing in the discharge lamp, in the discharge lamp lighting device, A discharge lamp lighting device lamp comprising a diode inserted in parallel with a semiconductor switch. 16. A discharge lamp, a DC voltage conversion circuit connected to both ends of the discharge lamp, a semiconductor switch connected in parallel with the DC voltage conversion circuit, and the DC voltage conversion circuit synchronized with a low frequency. Alternately output, and at the same time, a means for conducting the semiconductor switch connected in parallel with the DC voltage conversion circuit at rest to reverse the polarity of the current flowing in the discharge lamp, in the discharge lamp lighting device, A discharge lamp lighting device, comprising means for operating a semiconductor switch in the DC voltage conversion circuit at a fixed frequency and a fixed duty for a predetermined time from a standby state immediately after powering on the discharge lamp. 17. A discharge lamp, a DC voltage conversion circuit connected to both ends of the discharge lamp, a semiconductor switch connected in parallel with the DC voltage conversion circuit, and the DC voltage conversion circuit synchronized with a low frequency. Alternately output, and at the same time, a means for conducting the semiconductor switch connected in parallel with the DC voltage conversion circuit at rest to reverse the polarity of the current flowing in the discharge lamp, in the discharge lamp lighting device, A discharge lamp lighting device comprising means for operating the semiconductor switch at a low frequency for a predetermined time from a standby state immediately after the power supply of the discharge lamp is turned on. 18. A discharge lamp, a DC voltage conversion circuit connected to both ends of the discharge lamp, a semiconductor switch connected in parallel with the DC voltage conversion circuit, and the DC voltage conversion circuit synchronized with a low frequency. In the discharge lamp lighting device provided with means for inverting the polarity of the current flowing in the discharge lamp by conducting the semiconductor switch connected in parallel with the DC voltage conversion circuit which is not operating at the same time. A discharge lamp lighting device lamp comprising means for increasing the on-duty of a semiconductor switch in the DC boost circuit for a predetermined time immediately after detection. 19. The DC voltage conversion circuit is composed of a flyback type DC-DC converter that performs a one-shot voltage resonance operation, and the output voltage is variable, according to any one of claims 1 to 18. The discharge lamp lighting device as described above.