JPH07240293A - Power supply device, discharge lamp lighting device, and lighting system - Google Patents

Abstract

PURPOSE:To realize a small size and a light weight without increasing the device scale and the signal processing scale when an inverter, and a high voltage pulse generator for starting (ignitor) are installed, and furthermore, to prevent a breakdown of a switching element. CONSTITUTION:When a high voltage discharge lamp 30 is started and lighted, a starting switch 39 is turned on, and a high-frequency voltage Va by the charge and discharge of a capacitor C10 is fed to the primary coil of a boosting transformer 35. In this case, the voltage Vb of the charge and discharge of the capacitor C10 at the startup of the high-frequency voltage Va is applied to the primary coil of the booster transformer 35, and boosts and induces to the secondary coil. The high voltage pulse Vd of the above voltage is applied to the high voltage discharge lamp 30 through a rectifier D1, a discharge gap 36, and the secondary coil of a pulse transformer 38, so as to carry out the starting and the lighting. To the primary coil of the booster transformer 35, only a voltage which has a short discharge time discharged from the capacitor 10 at the startup of the high-frequency voltage Va is applied, the wire diameter of the coil is made thin, and the outer form of the boosting transformer 35 is made smaller.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a fluorescent lamp device, a projector,
Used for overhead projectors (OHPs) and automobile headlights, especially metal halide lamps,
The present invention relates to a power supply device, a discharge lamp lighting device, and a lighting device for starting and lighting a high-pressure sodium lamp or the like with a high-voltage pulse from a starting high-voltage pulse generator (igniter).

[0002]

2. Description of the Related Art Conventionally, this type of metal halide lamp,
In a high-pressure discharge lamp such as a high-pressure sodium lamp, a high-voltage high-voltage pulse, for example, several tens of KV is applied to both electrodes of the high-pressure discharge lamp at the time of starting, and the start-up is performed.

FIG. 8 is a circuit diagram showing the structure of such a conventional discharge lamp lighting device. In Figure 8, this example
Single-phase 100 V (V) of the commercial AC power supply 2 is converted into DC by the DC circuit 3 and input to the chopper 4, from which
For example, PWM (Pulse Width Modulati
The on) method is used to generate and output alternating current. This alternating current is input to the inverter 7 composed of a full bridge circuit of FETs Q1, Q2, Q3, Q4, and the high-frequency discharge lamp 10 arc-discharges the high-voltage discharge lamp 10 by the high-frequency voltage from the inverter 7. At the time of start-up in this case, that is, at the time of glow discharge, the high-voltage pulse generator (igniter) 8 for start-up operates to perform the start-up lighting.

FIG. 9 is a waveform diagram showing processing signals in the operation of the starting high-voltage pulse generator 8. In FIG. 9, the high-voltage pulse generator 8 for starting includes a high-pressure discharge lamp 1
The switch SW is turned on when 0 is turned on and the primary coil of the step-up transformer 12 is supplied with a high frequency voltage of 400 Hz and 300 V, for example, shown in FIG. 9A from the inverter 7. With this supply, as shown in FIG. 9B, a current (I = L (inductance) · di / dt) flows in the primary coil so as to rise on the time axis. The step-up AC from the secondary coil of the step-up transformer 12 is rectified by the rectifier D1, and
The capacitor C1 is charged and discharged, and a high voltage of, for example, 4 KV shown in FIG. 9C is applied to the primary coil of the pulse transformer 15 through the discharge gap 14. Then, the secondary coil of the pulse transformer 15 applies a high-voltage pulse boosted as shown in FIG. 9 (d), for example, a high-voltage pulse of 25 KV to the high-pressure discharge lamp 10 to perform start-up lighting.

In this discharge lamp lighting device, a large current flows through the primary coil of the step-up transformer 12 as shown in FIG. 9 (b), so an insulated wire having a large wire diameter is required. For example, its inductance is 1.25 H (henry), and in this case, the number of turns of the primary coil is several thousand T (turns), the number of secondary coils is several hundred thousand T (turns), and the step-up transformer 12 becomes large, And it becomes heavy. For example, the outer shape is 10 × 5
× 3 (Cm), the weight is 1 kg.

Further, in the discharge lamp lighting device shown in FIG.
The cycle of the high-voltage pulse from the secondary coil of the pulse transformer 15 is determined only by charging / discharging the capacitor C1 and discharging the discharge gap 14. Therefore, it is difficult to accurately determine the discharge cycle, the discharge cycle shifts to the non-operation section of the short circuit prevention of the inverter 7, and the high-voltage pulse of the high-voltage pulse is FETs Q1 to Q4.
When input to, the element will be destroyed.

As a proposal for improvement of this type of apparatus, Japanese Patent Laid-Open No. 4 (1999) -242242
The "discharge lamp lighting device" disclosed in Japanese Patent No. 61792 can be mentioned. FIG. 10 shows an example of this publication, in which a high-voltage discharge lamp 18 is connected to the inverters of the transistors Q1, Q2, Q3, Q4 through an inductor L1. Further, a starting high-voltage pulse generator 19 having a step-up transformer Tr1, a pulse transformer Tr, a double-wave rectification circuit, etc. is provided. The primary coil of the step-up transformer Tr1 of the starting high-voltage pulse generator 19 and one output end of the full bridge circuit are connected by a capacitor C through an inductor L1.

FIG. 11 is a waveform diagram of a processed signal in the operation of this configuration. 10 and 11, in this example, the inverter 7 performs switching operation at a high frequency at times t1 and t2 in FIG.
At 3, t4, the inverter performs switching operation at a low frequency. In this case, only the high frequency signal from the inverter at times t1 and t2 passes through the capacitor C and is supplied to the step-up transformer Tr1 of the starting high-voltage pulse generator 19. With the high frequency signal of the times t1 and t2, the high voltage discharge lamp 18 is restarted immediately after being turned off (at high temperature),
The high frequency discharge lamp 18 is operated by the low frequency signal at the times t3 and t4.
Glow discharge and arc discharge (hereinafter referred to as normal operation) are performed when the internal temperature of the device is decreasing.

[0009]

In the discharge lamp lighting device of the conventional example described above, in the former case shown in FIGS. 8 and 9, the step-up transformer 12 becomes large and heavy. For example, the outer shape is 10 × 5 × 3 (Cm) and the weight is 1 kg, so that it is not possible to reduce the size and weight of the entire device in consideration of handling such as manufacture and transportation, and further, the FET Q1 for switching the inverter 7 is used. There is a case where the element destruction of Q4 is caused.

In the publication examples shown in FIGS. 10 and 11, the starting high-voltage pulse generator 19 operates only when the restart lamp is lit. That is, during normal operation, the starting high-voltage pulse generator 19 is prevented from becoming a load on the inverter 7 to prevent its output voltage from decreasing. In this case, although the operation is stable during normal operation, the inverter 7
Is operated at a high frequency (time t1, t2), and
Switching control for operating at a low frequency (time t3, t4) is performed. Therefore, it is conceivable that the configuration of a control system (not shown) such as a PWM system and the signal processing become complicated and the cost thereof increases.

The present invention solves the drawbacks of the prior art as described above, and when the inverter and the high voltage pulse generator for starting (igniter) are provided, the device scale and the signal processing scale do not increase. In addition, the size and weight of the device can be reduced, destruction of the switching element of the inverter can be effectively prevented, the life of the lamp can be extended, and
It is an object of the present invention to provide a power supply device, a discharge lamp lighting device, and a lighting device that have improved versatility and productivity and that can reduce costs.

[0012]

In order to achieve the above object, a power supply device according to claim 1 is an inverter for converting a direct current into an alternating current, a step-up transformer for boosting at least an alternating voltage from the inverter, a rectifying means, A power supply device comprising a high-voltage pulse generator having a pulse transformer for outputting a high-voltage pulse, wherein a capacitor for charging / discharging an AC voltage from the inverter and applying the voltage to the step-up transformer is connected to the AC-voltage output terminal of the inverter The coil is connected to the coil.

According to another aspect of the power supply device of the present invention, the capacitor applies the voltage charged and discharged to the coil of the step-up transformer at the rise of the AC voltage from the inverter.

According to a third aspect of the power supply device of the present invention, the capacitance of the capacitor is between 0.1 microfarads and 10 microfarads, the step-up transformer is composed of a primary coil and a secondary coil, and the alternating voltage from the inverter is used. Is charged and discharged by a capacitor and applied to the primary coil, and the inductance of the primary coil is set between 1 millihenry and 100 millihenry.

According to another aspect of the power supply device of the present invention, the capacitor is composed of a plurality of capacitors having different electrostatic capacities, and a switch for selecting one of the plurality of capacitors is provided, and the switch is selected. This is a configuration in which a charging / discharging voltage based on the capacitance of a capacitor is applied to a step-up transformer, and a high voltage pulse having a different voltage is output from a pulse transformer.

According to another aspect of the power supply device of the present invention, a tap is provided on the coil of the step-up transformer for applying the charging / discharging voltage through the capacitor, and a switch for selecting the tap is provided. When the tap is switched by this switch. The voltage based on the inductance of is output from the step-up transformer.

According to a sixth aspect of the present invention, there is provided a discharge lamp lighting device, wherein the power supply device according to the first, second, third, fourth or fifth aspect is turned on by a pulse voltage output from an inverter, and a pulse transformer of a high voltage pulse generator. It is a configuration including a discharge lamp that is started and lit by a high-voltage pulse from.

According to another aspect of the discharge lamp lighting device of the present invention, the low temperature of the discharge lamp is detected by the detecting means for detecting the temperature of the discharge lamp, the plurality of capacitors having large and small capacitances, and the detecting means. At this time, select a capacitor with a small capacitance among multiple capacitors, apply a low charge / discharge voltage to the step-up transformer, and apply a low high-voltage pulse from the pulse transformer to the discharge lamp.
Moreover, when the detection means detects a high temperature of the discharge lamp, a capacitor with a large capacitance is selected and a high charge / discharge voltage is applied to the step-up transformer to apply a high voltage pulse from the pulse transformer to the discharge lamp. And a switching means of.

According to another aspect of the present invention, there is provided a discharge lamp lighting device, wherein the detecting means detects whether the temperature of the discharge lamp is high or low, and when the low temperature of the discharge lamp is detected by the detecting means, the tap of the coil of the step-up transformer has a large inductance. Select a low voltage from the step-up transformer, apply a low high-voltage pulse from the pulse transformer to the discharge lamp, and detect the high temperature of the discharge lamp with the detection means, and the inductance of the coil of the step-up transformer will be small. It is configured to include a switching unit for selecting a tap, outputting a high voltage from the step-up transformer, and applying a high high-voltage pulse from the pulse transformer to the discharge lamp.

The illumination device according to claim 9 is the illumination device according to claims 6 and 7.
Alternatively, the configuration of the discharge lamp lighting device described in 8 is provided with a reflection unit that reflects the light emitted from the discharge lamp.

[0021]

In the power supply device according to the present invention having this structure, the capacitor is charged and discharged at the rising of the AC voltage from the inverter, and this discharge voltage is applied to the step-up transformer.
Therefore, a large amount of current does not flow in the coil of the step-up transformer, the wire diameter of the coil is small (thin), the outer shape of the step-up transformer is small, and the device is small and lightweight. Further, the cycle of the high-voltage pulse from the pulse transformer becomes accurate due to the charging and discharging of the capacitor, and it is not input due to deviation in the non-operation section of the short circuit prevention of the inverter, so that element destruction does not occur.

In the power supply device according to the fourth and fifth aspects, one of a plurality of capacitors having different electrostatic capacities is selected and different charging and discharging voltages are applied to the step-up transformer. Also,
By selecting the tap of the coil of the step-up transformer and switching the inductance, different voltages are output from the step-up transformer. Therefore, high-voltage pulses of different voltages are obtained from the pulse transformer, and it becomes possible to use a plurality of types of discharge lamps that are respectively lit with this voltage, which improves the versatility and productivity of the device.

The discharge lamp lighting device according to any one of claims 6 to 8 has a low charging / discharging voltage from a capacitor having a small capacitance at the time of starting when the discharge lamp connected to the power supply device according to any one of claims 1 to 5 is at a low temperature. Is applied to the step-up transformer, and a high voltage pulse having a low voltage is applied to the discharge lamp. Further, when the temperature of the discharge lamp is high immediately after the light is turned off, the opposite operation is performed. Furthermore, the coil inductance of the step-up transformer is switched to operate in the same manner as when the capacitance of the capacitor is switched. Therefore, a high-voltage high-voltage pulse is not applied to the discharge lamp at low temperatures, and the life of the discharge lamp is extended.

An illumination device according to a ninth aspect is the illumination device according to the sixth aspect.
In addition to the structure of the discharge lamp lighting device described above, a reflector provided additionally, for example, a reflector, condenses light in a predetermined direction to perform illumination. Therefore, it is possible to perform stable and stable illumination over a long period of time with the actions of the power supply device having the configuration according to claims 1 to 6 and the discharge lamp lighting device having the configuration according to claims 6 to 8.

[0025]

Embodiments of the power supply device, discharge lamp lighting device and lighting device of the present invention will be described in detail with reference to the drawings. FIG. 1 is a circuit diagram showing the configuration of the first embodiment of the present invention. In FIG. 1, this example shows a commercial AC power supply 22 of single-phase 100 V (V) or 200 V, a DC circuit 23 having a bridge rectifier and an electrolytic capacitor for smoothing, and outputting DC, and a voltage from the DC circuit 23. Is provided with a field effect transistor (FET) that switches the pulse width by pulse width modulation (PWM), a diode for preventing backflow, a chopper 24 including a coil and a capacitor. Further, the inverter 26 configured by the full bridge circuit of the FETs Q1, Q2, Q3, Q4, the starting high-voltage pulse generator (igniter) 28 that operates at the time of starting, the chopper 24, and the inverter 26 are switching-controlled by a PWM method or the like. A control unit 29 and a high-pressure discharge lamp 30 that lights up with a high-frequency voltage from the inverter 26 are provided.

The starting high-voltage pulse generator 28 has one end connected to one output terminal (FETQ1, Q2) of the inverter 26, and a capacitor C10 for charging and discharging the output signal of the inverter 26, and the capacitor C10. A step-up transformer 35 having one end of the primary coil connected to the other end, a rectifier D10 for rectifying the AC output of the secondary coil of the step-up transformer 35, and a capacitor C11 for charging and discharging the rectified output from the rectifier D10 are provided. It is provided.

Further, this starting high-voltage pulse generator 28
Is a discharge gap (discharge element) 36 that repeatedly sparks (discharges) when the charge charged in the capacitor C11 is a specified voltage, and a discharge pulse from the discharge gap 36 is supplied to the primary coil, and the secondary coil Pulse transformer 38 for applying a high-voltage pulse for starting and lighting the high-pressure discharge lamp 30 from the power source, and a starting switch for supplying a high-frequency voltage from the inverter 26 to the primary coil of the step-up transformer 35 when the high-pressure discharge lamp 30 is started and lighting. And 39 are provided.

Next, the operation of the first embodiment will be described. FIG. 2 is a waveform diagram showing processed signals in the operation of the first embodiment. 1 and 2, the AC from the commercial AC power supply 22 is a DC circuit 23 and a chopper 24.
AC voltage (rectangular wave) is generated through the inverter 26
Entered in. In the inverter 26, the PWM of the control unit 29
2 (a) by switching control according to the method
, For example, a high frequency voltage V of 400 Hz and 300 V
Output a.

Here, the starting high-voltage pulse generator 28 operates to start and light the high-pressure discharge lamp 30. That is, after the high voltage pulse from the starting high voltage pulse generator 28 is applied and glow discharge is performed, lighting is performed by arc discharge with the high frequency voltage Va. First, the start switch 39 is turned on, and the capacitor C1 is connected to the primary coil of the step-up transformer 35.
A discharge voltage Vb due to zero charge / discharge is supplied. In this case, as shown in FIG. 2B, the capacitor C10 starts charging at the rising of the high frequency voltage Va, and when the charged charge reaches a specified voltage determined by the capacitance, the charged charge is discharged (charge discharge). The discharged discharge voltage Vb is the step-up transformer 35.
Applied to the primary coil.

This discharge voltage is boosted and induced in the secondary coil of the step-up transformer 35, rectified by the rectifier D10, and charged and discharged by the capacitor C11, as shown in FIG. 2 (c).
For example, a high voltage pulse Vc of 4 KV is applied to the primary coil of the pulse transformer 38 through the discharge gap 36. Then, from the secondary coil of the pulse transformer 38, as shown in FIG.
The boosted high-voltage pulse Vd, for example, a high-voltage pulse of 25 KV is applied to the high-pressure discharge lamp 30, and the high-pressure discharge lamp 30 is started and lit (glow discharge). In this case, in the primary coil of the step-up transformer 35, only a voltage having a short discharge time from the capacitor C10 at the rising of the high frequency voltage Va flows, and a high voltage corresponding to this voltage is induced in the secondary coil of the step-up transformer 35. After that, the starting switch 39 is turned off, the application of the high voltage pulse Vd from the pulse transformer 38 to the high voltage discharge lamp 30 is stopped, and the high voltage discharge lamp 30 is arc-discharged by the high frequency voltage Va and is turned on.

As described above, in the first embodiment, as described with reference to FIG. 9B, the step-up transformer 3 is used.
A large current (I = L · di / dt) does not flow in the primary coil of No. 5, and it is not necessary to use an insulated wire having a large wire diameter in the primary coil. This capacitor C10 is used in the inverter 2
Depending on the switching frequency of 6, for example, 0.1 μF
(Microfarad) to 10 μF, the inductance of the primary coil is 1 mH (millihenry) to 100
It becomes mH, and the outer shape of the step-up transformer 35 becomes small. For example, the external dimensions are 2.5 × 2.5 × 2 (Cm), the weight is 50 g, and the external dimensions of the booster transformer conventionally used as described above are 10 ×.
The weight is 5 × 3 (Cm) and the weight is 1 kg, and the size and weight are remarkably reduced, and the device can be manufactured and handled easily.

Further, the high voltage pulse from the secondary coil of the pulse transformer 38 is discharged because its cycle is determined by charging / discharging the capacitor C11 and discharging the discharge gap 36, and also by charging / discharging the capacitor C10. The period will be accurately determined. In other words, the discharge cycle becomes accurate, the discharge cycle shifts into the non-operation section of the short circuit prevention of the inverter 26, and the high-voltage pulse becomes FE.
Since no signal is input to TQ1 to Q4, element destruction does not occur.

In this case, the circuit configuration is the capacitor C.
Only 10 is added, and the configuration is simple. For example, the inverter is operated at a high frequency (time t1, t2) as in the prior art publications shown in FIGS. 10 and 11, and
The cost increase can be suppressed to an extremely low level without involving the switching control for operating at a low frequency (time t3, t4), without complicating the configuration of the control system and the signal processing.

FIG. 3 is a circuit diagram showing a modification of the starting high voltage pulse generator 28 shown in FIG. In the example shown in FIG. 3, the capacitor C10 is connected to the hot side of the primary coil of the step-up transformer 35, and the starting switch 39 is connected to the cold side of the primary coil of the step-up transformer 35. On the other hand, in this example, the hot side of the primary coil of the step-up transformer 35 is directly connected to the output terminal of the inverter 26, and the start switch 39 and the capacitor C10 are connected in series to the cold side of the primary coil of the step-up transformer 35. ing. The operation in this case is similar to the configuration shown in FIG.

Next, the second embodiment will be described. In the second embodiment, the capacitance of the capacitor C10 in the starting high-voltage pulse generator 28 shown in FIG.
The high-pressure discharge lamp 30 can cope with a low temperature such as room temperature and a high temperature inside immediately after being turned off. Further, the boosted voltage is doubled and applied to the discharge gap 36, so that a high high-voltage pulse is applied to the high-pressure discharge lamp 30. FIG. 4 is a circuit diagram showing the configuration of the second embodiment. In FIG. 4, the starting high-voltage pulse generator 28 of this example has capacitors C13 and C14 that charge and discharge the high-frequency voltage Va from the inverter 26 and a high-frequency voltage Va that is selected and supplied to one of the capacitors C13 and C14. A discharge voltage Vb due to charging and discharging from the switch 41 and the capacitor C13 or the capacitor C14 is supplied to the primary coil, and a voltage from the secondary coil of the step-up transformer 42 and the step-up transformer 42 in which a setter tap is provided in the secondary coil. Has a rectifier D12, D13 for doubling the voltage and applying it to the discharge gap 36. Other configurations are the same as those in FIG.

Next, the operation of the second embodiment will be described. In FIG. 4, the capacitors C13 and C14 have different capacitances. For example, the capacitor C13 has a smaller capacitance than the capacitor C14. This capacitance is set between 0.1 μF and 10 μF as described in the first embodiment. This capacitor C1 having a different capacitance
3, C14 switches the switch 41 based on the low temperature or the high temperature of the high pressure discharge lamp 30 to select. The voltage from the secondary coil of the step-up transformer 42 is rectified by the rectifiers D12 and D13.
The voltage is doubled and applied to the discharge gap 36, and a high voltage is applied to the discharge gap 36. That is, the pulse transformer 38 applies a more stable high-voltage high-voltage pulse Vd. Other operations are the same as those of the configuration shown in FIG.

In this operation, the high pressure discharge lamp 30
However, in the case of low temperature such as room temperature, the internal impedance of the lamp is lower than in the case of high temperature inside immediately after extinguished, so that high voltage pulse Vd of low voltage is applied to start lighting. First, the switch 41 is switched so as to select the capacitor C13 having a small electrostatic capacity. As a result, the charging / discharging voltage of the capacitor C13 decreases, and the voltage derived from the secondary coil of the step-up transformer 42 decreases.
The high-voltage pulse Vd applied from the pulse transformer 38 to the high-pressure discharge lamp 30 also drops.

When the inside of the high-pressure discharge lamp 30 is at a high temperature immediately after it is turned off, the internal impedance of the lamp is high, so that a high-voltage pulse Vd of a higher voltage is generated as compared with when the high-pressure discharge lamp 30 is at a low temperature. Apply the voltage to start lighting. That is, the switch 41 is switched so as to select the capacitor C14 having a large electrostatic capacity. in this case,
The discharge voltage of the capacitor C14 increases, the voltage induced from the secondary coil of the step-up transformer 42 also increases, and the high-voltage pulse Vd applied from the pulse transformer 38 to the high-voltage discharge lamp 30 increases.

Switching of the switch 41 in this case is performed manually or automatically, but hereinafter, the case of performing automatically will be described. FIG. 5 is a circuit diagram showing a configuration when the low temperature or the high temperature of the high pressure discharge lamp 30 is detected and the voltage of the high voltage pulse Vd applied to the high pressure discharge lamp 30 is automatically switched between high and low. In FIG. 5, in this example, a temperature detection element 45, such as a thermistor or a posistor, which is arranged close to or close to the high pressure discharge lamp 30, and a level of a detection signal from the temperature detection element 45 Based on the comparison signal from the comparison circuit 46 using a window comparator or the like which respectively compares the threshold value corresponding to the low temperature or the high temperature of the discharge lamp 30 and sends the comparison signal, and the comparison signal from the comparison circuit 46, A control unit 47 for driving and switching the movable contact is provided.

In this structure, the temperature detecting element 45 detects the temperature of the high pressure discharge lamp 30, and the comparison circuit 46 sends a comparison signal corresponding to the low temperature or high temperature of the high pressure discharge lamp 30 to the control section 47. This comparison signal causes the switch 41
Switch. That is, when the high-pressure discharge lamp 30 is at a low temperature, the capacitor C13 having a small electrostatic capacity is automatically selected, and the low-voltage high-voltage pulse Vd is applied to the high-pressure discharge lamp 30 to perform the starting lighting. In addition, the high pressure discharge lamp 30
When the temperature is high as immediately after being turned off, the capacitor C14 having a large electrostatic capacity is selected and the high-voltage pulse Vd is applied to the high-pressure discharge lamp 30 to perform the start-up lighting.

The capacitor C14 having a large capacitance is
The value of the capacitance is determined in consideration of the current flowing through the step-up transformer 42 and the voltage fluctuation of the inverter 26. That is, when the capacitance of the capacitor C14 is large, the charging / discharging voltage becomes large, the current flowing through the step-up transformer 35 also increases, and the load of the inverter 26 becomes heavy. Therefore, the size of the step-up transformer 42, which is the object of the present embodiment, is set to such an extent that it is not hindered, and the voltage of the inverter 26 is set so that the load does not become heavy and the voltage drop does not become large.

As described above, in the second embodiment, the switch 41 switches the capacitors C13 and C14 having large and small electrostatic capacities in accordance with the low temperature or the high temperature of the high pressure discharge lamp 30,
The high-voltage pulse Vd applied to the high-pressure discharge lamp 30 is variable. Therefore, when the high-pressure discharge lamp 30 has a low temperature, the high-voltage pulse Vd that is high at a high temperature is not applied, and the life of the high-pressure discharge lamp 30 can be extended.

Further, in the second embodiment, the high pressure discharge lamp 30 described above is the switch 4 in consideration of low temperature or high temperature.
It can be applied to the usage different from the switching of 1. Since the switch 41 selects the capacitors C13 and C14 having large and small electrostatic capacities to obtain the high and low high-voltage pulses Vd, two types of high-pressure discharge lamps (30) having different discharge voltage characteristics can be used. That is, the high-pressure discharge lamp (30) which is not mounted at the time of manufacture and shipped is shipped only as a power supply device, and then the high-voltage discharge lamp (30) suitable for any one of the high and low high-voltage pulses Vd obtained by switching the switch 41. Select and install and use. In this case, two types of high pressure discharge lamps (30) can be handled by one device, so that the versatility and productivity of the device are improved.

Next, a third embodiment will be described. In the third embodiment, the inductance of the secondary coil of the step-up transformer 35 is varied so that the high-pressure discharge lamp 30 can handle low temperature and high temperature. FIG. 6 is a circuit diagram showing the configuration of the third embodiment. In FIG. 6, the starting high-voltage pulse generator 28 of this example is
The switch 50 in which the movable contact c is connected to the capacitor C13 that charges and discharges the high frequency voltage Va from the inverter 26.
Is provided, and two fixed contacts b of this switch 50 are provided.
c is connected to the hot side end and the tap of the primary coil of the step-up transformer 35. Other configurations are the same as those in FIG.

Next, the operation of the third embodiment will be described. In FIG. 6, the start switch 39 is turned on when the high pressure discharge lamp 30 is turned on. After that, the switch 50 is switched according to the low temperature or the high temperature of the high pressure discharge lamp 30. When the high-pressure discharge lamp 30 has a low temperature, the movable contact c of the switch 50 is switched to select the fixed contact a. That is, by connecting the hot side end of the primary coil of the step-up transformer 35 and the capacitor C10,
The discharge voltage Vb due to the charge and discharge of 10 is applied to the primary coil of the step-up transformer 35. In this case, the inductance of the primary coil of the step-up transformer 35 is maximum, and the current (I = L · di / dt) becomes difficult to flow. As a result, the voltage induced in the secondary coil of the step-up transformer 35 is reduced, and the high-voltage discharge lamp 3 is discharged from the pulse transformer 38.
The high voltage pulse Vd applied to 0 decreases.

When the inside of the high-pressure discharge lamp 30 is at a high temperature immediately after it is turned off, the internal impedance of the lamp is high, so that the high-voltage pulse Vd having a higher voltage is generated as compared with the case where the high-pressure discharge lamp 30 is at a low temperature. Apply the voltage to start lighting. That is, the movable contact c of the switch 50 is switched so as to select the fixed contact b, and the tap of the primary coil of the step-up transformer 35 and the capacitor C10 are connected, so that the voltage Vb due to charging and discharging of the capacitor C10 is increased.
5 to the primary coil. In this case, the step-up transformer 3
5, the inductance of the primary coil decreases, a large amount of current (I = L · di / dt) flows, the induced voltage in the secondary coil of the step-up transformer 35 increases, and the voltage is applied from the pulse transformer 38 to the high-voltage discharge lamp 30. The applied high voltage pulse Vd becomes high. Switching of the switch 50 in this case is performed manually or automatically as in the second embodiment shown in FIG. In the case of automatic operation, the voltage of the high-voltage pulse Vd that is automatically applied to the high-pressure discharge lamp 30 is detected by detecting the low temperature or the high temperature of the high-pressure discharge lamp 30 with the same configuration as the second embodiment shown in FIG. To switch between high and low.

As described above, also in the third embodiment, the high voltage pulse Vd to be applied is varied in accordance with the low temperature or the high temperature of the high pressure discharge lamp 30 as in the second embodiment. Also in this case, when the high-pressure discharge lamp 30 is at a low temperature, the high-voltage pulse Vd at a high temperature is not applied, and the life of the high-pressure discharge lamp 30 can be extended. Also, two types of high pressure discharge lamps (30) having different discharge voltage characteristics can be used. That is, the high-pressure discharge lamp (30) is manufactured and shipped.
The high and low high-voltage pulse Vd obtained by switching the switch 50 after that
The high-pressure discharge lamp (30) suitable for any of the above can be selected and mounted and used, and the versatility and productivity of the apparatus are improved.

Next, a fourth embodiment will be described. The fourth embodiment is an illumination device using the discharge lamp lighting device shown in FIGS. 1 to 6. FIG. 7 is a circuit diagram showing a configuration of a fourth embodiment when the discharge lamp lighting device shown in FIGS. 1 to 6 is used as a lighting device. In FIG. 7, this illuminating device is provided with a reflecting plate 52 near the high-pressure discharge lamp 30 having the configuration shown in FIGS. 1 to 6. Other configurations are the same as those in FIG. The operation in this case is also similar to the configuration shown in FIG.

In each of these embodiments, the discharge lamp lighting device shown in FIGS. 1 to 6 and the lighting device shown in FIG. 7 are equipped with the high-pressure discharge lamp 30, respectively.
A power supply device that does not include the high pressure discharge lamp 30 may be used. In this case, as shown in FIG. 7, the output terminals of the inverter 26 are provided with connection terminals T1 and T2, and the high-pressure discharge lamp 30 is connected to the connection terminals T1 and T2 after shipment of this device.
Also, the reflector 52 is attached and used. Further, in these embodiments, a high voltage, for example, a high voltage pulse V of 25 KV is used.
Although the high-pressure discharge lamp 30 that starts and lights at d is used for the description, the invention can be applied to a backlight of a liquid crystal display (LCD) that starts and lights at a relatively low high-voltage pulse Vd, a fluorescent lamp, and the like.

[0050]

As is apparent from the above description, the power supply device according to claims 1 to 3 applies to the step-up transformer the voltage at which the capacitor is charged and discharged at the rising of the AC voltage from the inverter. , A large current no longer flows in the coil of the step-up transformer, the wire diameter of the coil becomes thin,
The external shape of the step-up transformer is reduced, and the size and weight of the device can be reduced. In addition, the cycle of the high voltage pulse from the pulse transformer becomes accurate due to the charging and discharging of the capacitor. Therefore, there is an effect that the element is not destroyed due to a shift in the non-operation section of the short circuit prevention of the inverter, and the element is not destroyed. Further, since these are composed of only one capacitor, there is an effect that the cost increase can be suppressed without increasing the signal processing scale and the device scale.

In the power supply device according to the fourth and fifth aspects, one of a plurality of capacitors having different electrostatic capacities is selected and different charging and discharging voltages are applied to the step-up transformer. Or
Since the coil tap of the step-up transformer is selected to switch the inductance and different voltages are derived from the step-up transformer, high-voltage pulses of different voltages are output from the pulse transformer, and at this voltage, for example, from multiple types of discharge lamps. It can be selected and turned on, which has the effect of improving the versatility and productivity of the device.

The discharge lamp lighting device according to any one of claims 6 to 8 applies a low charging / discharging voltage from the capacitor having a small capacitance when the discharge lamp connected to the power supply device according to any one of claims 1 to 5 is started at a low temperature. A high voltage pulse with a low voltage is applied to the discharge transformer, and a low voltage is applied to the discharge lamp. In addition, when the temperature is high, the opposite operation is performed, and the coil inductance of the step-up transformer is switched to operate in the same way as when the capacitance of the capacitor is switched. The high voltage pulse of high voltage is not applied, and the life of the discharge lamp is extended.

The illumination device according to claim 9 is the illumination device according to any one of claims 6 to 8.
Since the illumination is performed in a predetermined direction by a reflector provided additionally to the configuration of the discharge lamp lighting device described in claim 1,
It is possible to achieve stable and long-life illumination with the functions of the power supply device of the sixth aspect and the discharge lamp lighting device of the sixth to eighth aspects.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a configuration of a first embodiment of a discharge lamp lighting device of the present invention.

FIG. 2 is a waveform diagram showing a processed signal in the operation of the first embodiment.

FIG. 3 is a circuit diagram showing a modified example of the starting high-voltage pulse generator shown in FIG.

FIG. 4 is a circuit diagram showing a configuration of a second exemplary embodiment.

FIG. 5 is a circuit diagram showing a configuration for switching a high voltage pulse between high and low in the second embodiment.

FIG. 6 is a circuit diagram showing a configuration of a third exemplary embodiment.

FIG. 7 is a circuit diagram showing a configuration of a fourth example in which the discharge lamp lighting device is used as a lighting device in the example.

FIG. 8 is a circuit diagram showing a configuration of a conventional discharge lamp lighting device.

FIG. 9 is a waveform diagram showing a processed signal in the operation of the conventional example.

FIG. 10 is a circuit diagram showing a configuration of another conventional discharge lamp lighting device.

FIG. 11 is a waveform diagram showing a processed signal in the operation of another conventional example.

[Explanation of symbols]

 26 Inverter 28 High-voltage pulse generator for starting 29 Control part 30 High-voltage discharge lamp 35,42 Step-up transformer 36 Discharge gap 38 Pulse transformer 39 Start switch 41,50 Switch 45 Temperature detection element 46 Comparison circuit 47 Control part 52 Reflector C10 Capacitor

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) The inventor Manabu Kakashi 3-3-9 Shimbashi, Minato-ku, Tokyo Toshiba Abu E. Co., Ltd.

Claims (9)

[Claims] 1. A power supply device comprising: an inverter for converting direct current into alternating current; and a high voltage pulse generator for outputting a high voltage pulse having at least a step-up transformer for stepping up an alternating voltage from the inverter, a rectifying means, and a pulse transformer. In the power supply device, a capacitor for charging / discharging an AC voltage from the inverter and applying it to the step-up transformer is connected between an AC voltage output terminal of the inverter and a coil of the step-up transformer. 2. The power supply device according to claim 1, wherein the capacitor applies a voltage charged and discharged to the coil of the step-up transformer at the rising of the AC voltage from the inverter. 3. The capacitance of the capacitor is between 0.1 microfarads and 10 microfarads, the step-up transformer is composed of a primary coil and a secondary coil, and the AC voltage from the inverter is charged by the capacitor. Discharge and apply to the primary coil,
The inductance of the primary coil is from 1 millihenry to 1
The power supply device according to claim 1, wherein the power supply device has a duration of 00 millihenry. 4. The capacitor is configured by using a plurality of capacitors having different capacitances, and a switch for selecting one of the plurality of capacitors is provided, and the capacitance of the capacitor selected by the switch is set. 2. The power supply device according to claim 1, wherein the charging / discharging voltage based on the voltage is applied to the step-up transformer, and high-voltage pulses having different voltages are output from the pulse transformer. 5. A tap is provided in a coil of a step-up transformer for applying a charge / discharge voltage through the capacitor, and
The power supply device according to claim 1, further comprising a switch for selecting the tap, wherein the booster transformer outputs a voltage based on an inductance when the tap is switched by the switch. 6. The power supply device according to claim 1, 2, 3, 4 or 5 is lit with a pulse voltage output from an inverter,
A discharge lamp lighting device, comprising a discharge lamp that is started and lit by a high voltage pulse from a pulse transformer of a high voltage pulse generator. 7. A detector for detecting the temperature of the discharge lamp, a plurality of capacitors having large and small capacitances, and a capacitor among the plurality of capacitors when the detector detects a low temperature of the discharge lamp. A capacitor with a small electrostatic capacity is selected, a low charge / discharge voltage is applied to the step-up transformer, a low high-voltage pulse is applied from the pulse transformer to the discharge lamp, and the detecting means,
When a high temperature of the discharge lamp is detected, a capacitor having a large capacitance is selected, a high charging / discharging voltage is applied to the step-up transformer, and a switching means for applying a high high-voltage pulse from the pulse transformer to the discharge lamp is provided. 7. The discharge lamp lighting device according to claim 6, wherein. 8. A detecting means for detecting a high or low temperature of a discharge lamp, and when the low temperature of the discharge lamp is detected by the detecting means, a tap having a large inductance of a coil of the step-up transformer is selected to detect a low voltage. Output from the step-up transformer, apply a low high-voltage pulse from the pulse transformer to the discharge lamp, and select a tap with a small inductance of the coil of the step-up transformer when the detection means detects a high temperature of the discharge lamp, 7. The discharge lamp lighting device according to claim 6, further comprising switching means for outputting a high voltage from the step-up transformer and applying a high high-voltage pulse from the pulse transformer to the discharge lamp. 9. An illuminating device comprising the structure of the discharge lamp lighting device according to claim 6, 7 or 8 and further comprising reflecting means for reflecting light emitted from the discharge lamp.