JP3430757B2 - High pressure discharge lamp lighting device - Google Patents

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 for lighting a high pressure discharge lamp such as a mercury lamp, a metal halide lamp and a high pressure sodium lamp.

[0002]

2. Description of the Related Art As a high pressure discharge lamp lighting device as described above, the present applicant has already proposed a device as shown in FIG. 17 (see Japanese Patent Application No. 7-89862). This high-pressure discharge lamp lighting device connects a series circuit of an inductor L ₁ having an intermediate tap and a high-pressure discharge lamp DL at both ends of a commercial AC power supply AC, and a connection point between the high-pressure discharge lamp DL and a commercial AC charge AC and an inductor. Between the middle tap of L ₁ , the capacitor C ₁
When connecting a series circuit of a three-terminal AC control element Q _1, a control circuit 2 for turning on the three-terminal AC control elements Q _1, by turning on the three-terminal AC control elements Q _1, high in the high-pressure discharge lamp DL In a high-voltage discharge striking and lighting device for applying a voltage pulse to start the high-voltage discharge lamp DL with the inductor L ₁ as a current limiting element, a three-terminal AC control element Q
Voltage Vc across capacitor C ₁ when ₁ is off
The three-terminal AC control element Q ₁ is operated for at least a predetermined time T so that the peak value of the off-voltage of the three-terminal AC control element Q ₁ which is a combined voltage of the power supply voltage of the commercial AC power supply AC is equal to or less than the maximum rating. It has a means to keep it on.

Here, during a predetermined time T for keeping the three-terminal AC control element Q ₁ ON, the value of the voltage Vc across the capacitor C ₁ when the three-terminal AC control element Q ₁ is OFF becomes constant, In addition, the polarity is such that the off-voltage immediately before the three-terminal AC control element Q ₁ is turned on becomes constant.
Alternatively, it is preferable to set it to be the sum of the voltage Vc across the capacitor C ₁ and the power supply voltage of the commercial AC power supply AC. Further, it is preferable that the predetermined time T be minimized so that the value of the voltage Vc across the capacitor C ₁ becomes maximum when the three-terminal AC control element Q ₁ is off.

[0004] Incidentally, the cause continues to turn the three-terminal AC control elements Q ₁ for a predetermined time T, a three-terminal AC control elements Q ₁
To the gate of the three-terminal AC control element Q ₁ or a pulse voltage including at least a period in which the current of the three-terminal AC control element Q ₁ is equal to or less than the holding current is applied to the gate of the three-terminal AC control element Q _1. You can do it like this. Further, the high-pressure discharge lamp DL is reduced by gradually decreasing the predetermined time T.
It is preferable to sequentially increase the high voltage pulse applied to the. Furthermore, it is preferable to add a pulse generation circuit that generates a larger high-voltage pulse and applies it to the high-pressure discharge lamp DL by using the high-voltage pulse as a power source only when the high-voltage pulse becomes a predetermined value or more.

In the circuit configuration of the high pressure discharge lamp lighting device shown in FIG. 17, an inductor L ₁ , a high pressure discharge lamp DL and a primary winding n ₁ of a lamp current detecting current transformer T ₂ are connected in series to a commercial AC power source AC. The circuit is connected. The inductor L ₁ has a center tap, the commercial AC power source AC, 1 winding N ₁ of the inductor L _1, a capacitor C _1, three closed loop due to the series connection of the terminals AC control element Q ₁ is being configured. In addition, a control circuit 2 for properly controlling the three-terminal AC control element Q ₁ , a lighting determination circuit 3 for detecting a lamp current to determine lighting / non-lighting, and a circuit for driving each of the circuits 2 and 3 described above. The control power supply circuit 1 is configured.

In the control power supply circuit 1, the power supply voltage of the commercial AC power supply AC is stepped down by the transformer T ₁ and then rectified and smoothed by the diode bridge DB ₁ and the capacitor C ₃ to obtain a desired DC voltage. The lighting discrimination circuit 3 converts the lamp current into a voltage by the lamp current detecting current transformer T _{2, and} rectifies and smoothes the voltage by the diode D ₂ and the capacitor C ₆ to obtain a DC voltage. The DC voltage is compared with the reference voltage by the comparator CP ₁ to determine lighting / non-lighting. The reference voltage of the comparator CP ₁ is the capacitor C ₃
Voltage is divided by resistors R ₁₁ and R ₁₂ .

The control circuit 2 is driven by the DC voltage obtained by the control power supply circuit _1, and turns on the three-terminal AC control element Q ₁ by the output of the No. pin of the timer circuit IC ₁ . The timer circuit IC ₁ is, for example, a μPD5 manufactured by NEC.
In a timer IC such as 555, when a trigger signal (a voltage of 1/3 or less of the control power supply) is applied to the No. pin, a pulse having a time width determined by the resistor R ₁₀ and the capacitor C ₅ is output from the No. pin. It is output. However, the above operation is the operation when the No. pin is at the high level,
When the No. pin is at the Low level, the output from the No. pin is fixed at the Low level.

Next, the structure of the trigger circuit for generating the trigger signal applied to the pin # ₁ of the timer circuit IC ₁ will be described. Positive output terminal of the diode bridge DB _1, resistor R _3, a capacitor C _2, a closed loop of the negative output terminal of the diode bridge DB ₁ is configured, furthermore, the center of a resistor R ₃ and capacitor C ₂ is bidirectional two-terminal Sairisuku Q ₂ ,
It is connected to the base of the transistor Q ₃ via the resistor R ₄ . A resistor R ₅ is connected between the base and emitter of the transistor Q ₃ . Further, the collector of the transistor Q ₃ is connected to the plus side of the control power source (capacitor C ₃ ) via the resistor R ₆ , and the transistor Q ₃
The emitter of is connected to the negative side of the control power supply.
The above-mentioned trigger signal is obtained from the collector of the transistor Q ₃ , and is connected to the No. pin of the timer circuit IC ₁ . To explain the operation, first, it charges the capacitor C ₂ by the output of the die auto Fridge DB ₁ is charging and reaches the switching voltage of the bidirectional two-terminal Sairisuku Q _2, bidirectional two-terminal Sairisuku Q ₂ is turned on, It charges the capacitor C ₂ flows instantaneously transistor Q ₃ total Ichisu, the transistor Q ₃ is turned on momentarily. Therefore, the _1st pin of the timer circuit IC ₁ has 1/3 of the control power supply.
The following voltages are momentarily applied and the timer circuit IC ₁ is triggered.

The above operation waveforms are shown in FIG. In the figure,
(A) is a timer circuit IC₁No. pin voltage, (b) is
Diode bridge DB₁Output voltage, (c) is the
Sensor C ₂Voltage, (d) is the timer circuit IC₁Pin number
Voltage, (e) is the timer circuit IC₁With the voltage of pin number
is there. The overall operation will be described below. High pressure discharge lamp D
When L is lit, the output of the lighting determination circuit 3 is Lo.
Timer circuit IC at w level₁No. pin output is Lo
Fixed to w level, 3-terminal AC control element Q₁Turned on
Absent. The high pressure discharge lamp DL is an inductor L₁Is a current limiting element
Steadily lights up. High-pressure discharge lamp DL is not lit
At this time, the output of the lighting determination circuit 3 is at the high level.
As described above, the timer circuit IC₁From the pin
A pulse having a predetermined time T is output. Then, three terminal exchange
Flow control element Q₁Is turned on, commercial AC power supply AC, inductor
L₁Primary winding N₁, Capacitor C₁, Three-terminal AC system
Element Q₁Closed loop of several kHz to several tens of kHz
Oscillating current I₂Flows. Its oscillating current I₂By inda
Kuta L₁Primary winding N₁The voltage generated at the inductor L
₁Boosted by the high voltage pulse, high pressure discharge lamp
Applied across DL. Then, the high pressure discharge lamp DL starts
Move.

FIG. 19 is an operation waveform diagram. In the figure, (a)
Is a three-terminal AC control element Q₁When is on / off
Three-terminal AC control element Q₁Is the ON signal of the timer circuit
IC ₁It is the output of the pin. (B) is the oscillating current I₂
And capacitor C₁Voltage Vc across₁, (C) has three terminals
AC control element Q₁Voltage V across₁Is. For a predetermined time T
3 terminals AC control element Q₁Trigger signal is applied to
Therefore, even if there is a change in ambient temperature or variations in elements,
Three-terminal AC control element Q at points A and B₁Can turn off
never. Therefore, the three-terminal AC control element Q₁Resistant as
Since it is possible to use an element with low pressure performance independently, it is inexpensive.
It Furthermore, in consideration of changes in ambient temperature and variations in elements,
However, the oscillating current I that almost turns off₂Directly at the zero cross point C
Until now, three-terminal AC control element Q₁Apply a trigger signal to
ing. Therefore, the three-terminal AC control element Q₁Is at point C
Turn off.

[0011] three since the terminal AC control element Q ₁ is turned off at point C each time, and the polarity of the voltage Vc ₁ of the capacitor C ₁ at the time of three-terminal AC control element Q ₁ is turned off, then a three-terminal AC control elements Q ₁ is the relationship of polarities of the AC power source AC supply voltage at the time of turning on is constant, therefore, the three voltage across the terminals AC control element to Q ₁ immediately before the three-terminal AC control element Q ₁ is turned on is constant. In addition, the polarity of the voltage Vc ₁ of the capacitor C ₁ at the time when the three-terminal AC control element Q ₁ is turned off is the same as that at the time when the three-terminal AC control element Q ₁ is turned on next.
It has a relationship of being superimposed on the power supply voltage of C. Furthermore, as the maximum value voltage Vc ₁ of the capacitor C ₁ satisfies pressure resistance of the three-terminal AC control elements Q _1, is set the time T of the trigger signal. Therefore, the power supply of the oscillating current I ₂ flowing when the three-terminal AC control element Q ₁ is turned on takes the maximum value under the condition that the withstand voltage performance of the three-terminal AC control element Q ₁ can be satisfied. As described above, since the power supply of the oscillating current I ₂ is constant and maximum, the high voltage pulse applied to the high pressure discharge lamp DL is large and stable. Therefore, the startability becomes good.

Further, in actuality, in order to ensure safety as in the other conventional example shown in FIG. 20, when the high pressure discharge lamp DL is not lit, a high voltage pulse is not continuously generated, but for example, High voltage pulses are generated intermittently, such as every few seconds for several seconds. Then, as shown in FIG. 21, in the low-frequency oscillator circuit 4, when the high-pressure discharge lamp DL is lit, that is, the output of the lighting determination circuit 3 is Low.
At that time, the oscillation is stopped and the output is fixed to Low. On the other hand, when the high pressure discharge lamp DL is not lit, that is, when the output of the lighting determination circuit 3 is High, oscillation occurs,
A low-frequency oscillation signal whose period τ ₁ (for example, several seconds) is High and for example, period τ ₂ for several tens of seconds is Low is output. As a result, a high-voltage pulse is generated only when the output of the low-frequency oscillator circuit 4 is High. To do.

[0013]

In the conventional example shown in FIG. 20, the output of the low frequency oscillation circuit 4 changes from High to Lo.
When the generation of the high voltage pulse is stopped by switching to w, as shown in FIG. 22, the voltage V across the three-terminal AC control element Q ₁ is
₁ may exceed the maximum rated voltage of the three-terminal AC control element Q ₁ . Therefore, three-terminal AC control terminal Q
_{Use one with} a maximum rated voltage larger than ₁ , or
Alternatively, it is necessary to connect and use two three-terminal AC control terminals in series, which causes a problem of cost increase.

To solve the above problem, the capacitor C ₁
3 terminal AC control element Q, such as connecting low resistance to both ends of
_{If the} voltage across the capacitor C ₁ is not held when ₁ is off, the voltage V ₁ across the three-terminal AC control element Q ₁ will be small when the high-voltage pulse is generated, and the voltage across the capacitor V ₁ will be small, resulting in a predetermined peak. To get the value, inductor L
_It is necessary to increase the step-up ratio of ₁ ((N ₁ + N ₂ ) / N ₁ ). Then, the inductance value of the primary winding N ₁ of the inductor L ₁ becomes small, and it is necessary to increase the capacitance of the capacitor C _{1 in} order to obtain a predetermined pulse width.
There is a problem that the circuit becomes large and the cost increases. Furthermore, if the capacitance of the capacitor C ₁ is increased, the oscillating current is increased, and it is necessary to use a three-terminal AC control element Q ₁ having a large current rating or to use two three-terminal AC control elements connected in parallel. However, there is a problem that the circuit becomes large and the cost is increased.

The present invention is intended to solve the above problems, and an object thereof is to provide a high pressure discharge lamp lighting device which is small in size, low in price, and reliable.

[0016]

In order to achieve the above object, the invention of claim 1 connects an inductor having an intermediate tap and a series circuit of a high pressure discharge lamp to both ends of a commercial AC power source, and discharges the high voltage discharge. A series circuit of a capacitor and a first three-terminal AC control element is connected between a connection point of a light and the commercial AC power supply and an intermediate tap of the inductor, and a resistor and a second three-terminal AC control are provided at both ends of the capacitor. A first control circuit for connecting a series circuit of elements and intermittently turning on the first three-terminal alternating current control element by repeating a period for continuously turning on and off and a rest period, and a second three-terminal alternating current A second control circuit for turning on the control element, and by intermittently turning on the first three-terminal AC control element, a high-voltage pulse is intermittently applied to the high-pressure discharge lamp to start it. Inductor current limit required As a high pressure discharge lamp lighting device for stably lighting the high pressure discharge lamp, the first three-terminal AC control element is turned off within a period in which the first three-terminal AC control element is continuously turned on and off. The first three-terminal AC control is performed so that the peak value of the off-voltage of the first three-terminal AC control element, which is the combined voltage of the voltage across the capacitor and the commercial AC power supply during In a high pressure discharge lamp lighting device provided with means for continuing to turn on the element for at least a predetermined time, when switching from a period in which the first three-terminal AC control element is continuously turned on and off to a rest period, a second three Since the second control circuit for turning on the terminal AC control element and discharging the electric charge of the capacitor suddenly through the resistor is provided, the first three-terminal AC control element is turned ON / OFF continuously. Term Without overvoltage is applied to the first three-terminal AC control device when switching to the idle period from cost can be reduced by use of lower element withstand voltage performance alone.

According to a second aspect of the present invention, in order to achieve the above-mentioned object, a first tap having intermediate taps at both ends of a commercial AC power source.
Connecting a series circuit of the inductor and the high-pressure discharge lamp, and between the connection point of the high-pressure discharge lamp and the commercial AC power source and the intermediate tap of the first inductor, the first three-terminal AC control element and the second three-terminal AC control element. Connecting a series circuit of the inductor and a series circuit of a resistor and a second three-terminal AC control element at both ends of the series circuit of the capacitor and the second inductor,
And a second control circuit for turning on the second three-terminal AC control element, the first control circuit for intermittently turning on the three-terminal AC control element by repeating a period for continuously turning on and off and a rest period.
And a first control circuit for intermittently turning on the first three-terminal AC control element to intermittently apply a high voltage pulse to the high-pressure discharge lamp to start the first high-voltage discharge lamp and to start the first inductor as a current limiting element. As a high pressure discharge lamp lighting device for stably lighting the high pressure discharge lamp, the first three-terminal AC control element is turned off within a period in which the first three-terminal AC control element is continuously turned on and off. The first three-terminal AC control is performed so that the peak value of the off-voltage of the first three-terminal AC control element, which is the combined voltage of the voltage across the capacitor and the commercial AC power supply during In a high pressure discharge lamp lighting device provided with means for continuing to turn on the element for at least a predetermined time, when switching from a period in which the first three-terminal AC control element is continuously turned on / off to a rest period, a second three Terminal AC system Since the second control circuit for turning on the element and discharging the electric charge of the capacitor through the resistor and the second inductor is suddenly provided, the first three-terminal AC control element is continuously turned on.・ No overvoltage is applied to the first three-terminal AC control element when switching from the off period to the rest period, and an element with low withstand voltage performance can be used alone to reduce costs, and the charge of the capacitor Is discharged via the second inductor, it is possible to suppress the time change of the discharge current and remove the stress on the second three-terminal AC control element.

In order to achieve the above object, a third aspect of the present invention is to connect a series circuit of an inductor having an intermediate tap and a high pressure discharge lamp to both ends of the commercial AC power source, and to connect the high pressure discharge lamp and the commercial AC power source. A series circuit of a first three-terminal AC control element and a capacitor section composed of a series-parallel circuit of a plurality of capacitors including a series connection of at least two capacitors, between the connection point of 1) and the intermediate tap of the inductor. And connecting a series circuit of a resistor and a second three-terminal AC control element to both ends of a part of the series configuration of the capacitor section.
And a second control circuit for turning on the second three-terminal AC control element, the first control circuit for intermittently turning on the three-terminal AC control element by repeating a period for continuously turning on and off and a rest period.
And a control circuit for controlling the first three-terminal alternating current control element to be intermittently turned on to intermittently apply a high-voltage pulse to the high-pressure discharge lamp to start the high-pressure discharge lamp, and to use the inductor as a current limiting element. A high-pressure discharge lamp lighting device for stably lighting a high-pressure discharge lamp, wherein the first three-terminal AC control element is turned off within a period in which the first three-terminal AC control element is continuously turned on / off. At this time, the first three-terminal AC control element is controlled so that the peak value of the off-voltage of the first three-terminal AC control element, which is a combined voltage of the voltage across the capacitor section and the commercial AC power supply, is equal to or less than the maximum rating. In a high pressure discharge lamp lighting device provided with means for keeping on for at least a predetermined time, a second three terminal is provided when switching from a period during which the first three terminal alternating current control element is continuously turned on and off to a rest period. Exchange system Since the second control circuit is provided which turns on the element and discharges a part of the electric charge in the series configuration of the capacitor section suddenly through the resistor, the first three-terminal AC control element is continuously connected. No overvoltage is applied to the first three-terminal AC control element when switching from the on / off period to the rest period, and an element with low withstand voltage performance can be used alone to reduce costs, and the capacitor section Since some of the electric charge of the series configuration of
An element having low withstand voltage performance can be used as the three-terminal AC control element.

According to a fourth aspect of the invention, in order to achieve the above object, a first tap having intermediate taps at both ends of a commercial AC power supply.
Connecting a series circuit of the inductor and the high-pressure discharge lamp, and including a series connection of at least two capacitors between the connection point of the high-pressure discharge lamp and the commercial AC power source and the intermediate tap of the first inductor. Is connected to a series circuit of a first three-terminal AC control element and a second inductor, the series circuit including a series circuit of the second inductor and a part of the series configuration of the capacitor section. Connect a series circuit of a resistor and a second three-terminal AC control element to both ends,
A first three-terminal AC control element is turned on and off intermittently by repeating a period for continuously turning on and off and a rest period.
And a second control circuit for turning on the second three-terminal AC control element, and by intermittently turning on the first three-terminal AC control element, a high voltage pulse is applied to the high pressure discharge lamp. Is a high-pressure discharge lamp lighting device for stably lighting the high-pressure discharge lamp using a first inductor as a current limiting element, wherein the first three-terminal AC control element is continuously turned on. The off-voltage of the first three-terminal AC control element, which is the combined voltage of the voltage across the capacitor and the commercial AC power supply when the first three-terminal AC control element is off during the off period In the high-pressure discharge lamp lighting device provided with means for keeping the first three-terminal AC control element turned on for at least a predetermined time so that the peak value of is less than or equal to the maximum rating, the first three-terminal AC control element is Continuously turned on and off The second three-terminal AC control element is turned on when switching from the period to the rest period to suddenly discharge a part of electric charge in the series configuration of the capacitor section through the resistor and the second inductor. Since the second control circuit is provided, an overvoltage may be applied to the first three-terminal AC control element when switching from the period in which the first three-terminal AC control element is continuously turned on / off to the rest period. Therefore, the element with low withstand voltage performance can be used alone to reduce the cost, and moreover, since the electric charge is discharged through the second inductor, the time change of the discharge current is suppressed and the second three-terminal AC It is possible to remove the stress on the control element, and further, since a part of the electric charge in the series configuration of the capacitor section is discharged, it is possible to use an element having low withstand voltage performance as the second three-terminal AC control element. Can .

[0020]

[0021]

DETAILED DESCRIPTION OF THE INVENTION

(Embodiment 1) FIG. 1 is a circuit configuration diagram showing a first embodiment of the present invention. Since the basic configuration is common to the conventional example shown in FIGS. 17 and 20, the common parts are the same. And the description thereof will be omitted.

In this embodiment, both ends of the commercial AC power supply AC
Inductor L₁, High pressure discharge lamp DL, for lamp current detection
Current transformer T₂Primary winding n₁Connected in series circuit
Has been done. Inductor L₁Has a middle tap, commercial
AC power supply AC, inductor L ₁Primary winding N₁, First
Three-terminal AC control element Q₁, Coreless inductor L₂, 9
Capacitor C₁₁~ C₁₉3 series 3 parallel configuration capacitors
A closed loop is formed by connecting the parts 5 in series.

Further, the inductor L ₂ and the six capacitors C ₁₁ , C ₁₂ , C ₁₄ , C ₁₅ , C ₁₇ , and C ₁₈ are arranged in parallel with the series circuit of the capacitor section 6 having a two-series and three-parallel configuration. A series circuit of the resistor R ₁₆ and the second three-terminal AC control element Q ₇ is connected. In addition, a control circuit 2 for appropriately controlling the two three-terminal AC control elements Q ₁ and Q ₇ ,
A lighting discriminating circuit 3 for discriminating lighting / non-lighting by detecting a lamp current and a control power supply circuit 1 for driving each of the circuits 2 and 3 are configured.

In the control power supply circuit 1, the commercial AC power supply AC is stepped down by the transformer T ₁ and then rectified and smoothed by the diode bridge DB ₁ and the capacitor C ₃ to obtain a desired DC voltage. The lighting discrimination circuit 3 converts the lamp current into a voltage by the lamp current detecting current transformer T _{2, and} rectifies and smoothes the voltage by the diode D ₂ and the capacitor C ₆ to obtain a DC voltage. The DC voltage is used as a comparator CP
_{The value of 1} is compared with the reference voltage to determine lighting / non-lighting.
The reference voltage of the comparator CP ₁ is obtained by dividing the voltage of the capacitor C ₃ by the resistors R ₁₁ and R ₁₂ .

The control circuit 2 is driven by the DC voltage obtained by the control power supply circuit 1, and has a three-terminal AC control element Q ₁
Is turned on by the output of the pin ₁ of the timer circuit IC ₁ ,
When the output of the low-frequency oscillator circuit 4 switches from High to Low, the transistor Q ₆ is momentarily turned on to apply a trigger signal to turn on the three-terminal AC control element Q ₇ . That is, in the present embodiment, the first and second three-terminal AC control elements Q ₁ and Q ₇ are turned on by the common control circuit 2.
I'm turning it off.

In the timer circuit IC ₁ , when a trigger signal (voltage less than 1/3 of the control power supply) is applied to the No. pin, a pulse having a time width determined by the resistor R ₁₀ and the capacitor C ₅ is output from the No. pin. It is output. However, the above operation is the operation when the No. pin is at the high level,
When the No. pin is at the Low level, the output from the No. pin is fixed at the Low level.

Next, the structure of the trigger circuit for creating the trigger signal applied to the pin # ₁ of the timer circuit IC ₁ will be described. Positive output terminal of the diode bridge DB _1, resistor R _3, a capacitor C _2, a closed loop of the negative output terminal of the diode bridge DB ₁ is configured, furthermore, the center of a resistor R ₃ and capacitor C ₂ is bidirectional two-terminal Sairisuku Q ₂ ,
It is connected to the base of the transistor Q ₃ via the resistor R ₄ . A resistor R ₅ is connected between the base and emitter of the transistor Q ₃ . Further, the collector of the transistor Q ₃ is connected to the plus side of the control power source (capacitor C ₃ ) via the resistor R ₆ , and the transistor Q ₃
The emitter of is connected to the negative side of the control power supply.
The above-mentioned trigger signal is obtained from the collector of the transistor Q ₃ , and is connected to the No. pin of the timer circuit IC ₁ . To explain the operation, first, it charges the capacitor C ₂ by the output of the die auto Fridge DB ₁ is charging and reaches the switching voltage of the bidirectional two-terminal Sairisuku Q _2, bidirectional two-terminal Sairisuku Q ₂ is turned on, It charges the capacitor C ₂ flows instantaneously transistor Q ₃ total Ichisu, the transistor Q ₃ is turned on momentarily. Therefore, the _1st pin of the timer circuit IC ₁ has 1/3 of the control power supply.
The following voltages are momentarily applied and the timer circuit IC ₁ is triggered.

The low frequency oscillating circuit 4 outputs the light of the high pressure discharge lamp DL, that is, the output of the lighting determining circuit 3 is L.
When it is ow, the oscillation is stopped and the output is fixed to Low. Further, when the high-pressure discharge lamp DL is not lit, that is, when the output of the lighting determination circuit 3 is High, oscillation occurs, for example, a period τ _{1 of} several seconds is High, and a period τ _{2 of} several tens of seconds is Low. The low frequency oscillation signal of is output. Then, a high voltage pulse is generated only when the output of the low frequency oscillation circuit 4 is High, and as a result, a high voltage pulse is generated intermittently.

The above operation waveforms are shown in FIG. In the figure,
(A) is a timer circuit IC₁No. pin voltage (low frequency
Output voltage of the oscillation circuit 4), (b) is a diode bridge D
B₁Output voltage, (c) is capacitor C₂Voltage of
(D) is a timer circuit IC₁No. pin voltage, (e) is
Timer circuit IC₁No. pin voltage, (f) is transition
Star Q ₆Is the collector voltage of.

The overall operation of this embodiment will be described below. When the high pressure discharge lamp DL is lit, the output of the lighting determination circuit 3 is at the Low level, so the low frequency oscillation circuit 4
Stops oscillating, and the output of the pin ₁ of the timer circuit IC ₁ is L
It is fixed at the ow level and the three-terminal AC control element Q ₁ does not turn on. In the high pressure discharge lamp DL, the inductor L ₁ serves as a current limiting element to stably light up. When the high-pressure discharge lamp DL is not lit, the output of the lighting determination circuit 3 is at a high level, so that the low-frequency oscillation circuit 4 oscillates, and as described above, the pin No. of the timer circuit IC ₁ outputs a predetermined time T. A pulse is output. Then, the three-terminal AC control element Q ₁ is turned on,
Commercial AC power supply AC, 1 winding N ₁ of the inductor L _1, a capacitor 5, a three-terminal AC control elements Q _1, flows air core inductor L ₂ of the large oscillating current I ₂ of the closed loop several kHz~ tens kHz . The voltage generated in the primary winding Nl of the inductor L ₁ by the oscillating current I ₂ is boosted by the inductor L ₁ to generate a high voltage pulse, and the high pressure discharge lamp DL is generated.
Applied to both ends of. Then, the high pressure discharge lamp DL is started.

The high voltage pulse is the output of the low frequency oscillator circuit 4.
In response, for example, every few tens of seconds
Occurs intermittently. Capacitor section 5 has a withstand current and voltage
9 capacitors C to ensure₁₁~ C₁₉3 series
It has three parallel configurations. Air core inductor L₂Is the three ends
Sub AC control element Q₁When the inductor turns on, the inductor L₁of
Primary winding N₁Stray capacitance C₀Surge current flowing through
The three-terminal AC control element Q₁To protect
It is a thing. FIG. 3 is an operation waveform diagram of this embodiment. Figure
Inside, (a) is a three-terminal AC control element Q ₁Turns on / off
3-terminal AC control element Q₁Is the on signal of
Timer circuit IC₁It is the output of the pin. (B) is shake
Moving current I₂And capacitor C ₁Voltage Vc across₁,
(C) is a three-terminal AC control element Q₁Voltage V across₁And
It

During a predetermined time T, the three-terminal AC control element Q ₁
Since the trigger signal is applied to point A, point A and point B in FIG.
At that point, the three-terminal AC control element Q ₁ never turns off. Therefore, an element having low withstand voltage performance can be used alone as the three-terminal AC control element Q ₁ , and the cost can be reduced. Furthermore, in the present embodiment, even in consideration of changes in ambient temperature and variations in elements, a trigger signal is applied to the three-terminal AC control element Q ₁ until just before the zero crossing point C of the oscillating current I ₂ that is almost off. There is. Therefore, the three-terminal AC control element Q ₁ is turned off at the point C.

The three since the terminal AC control element Q ₁ is turned off at point C each time, and the polarity of the voltage Vc ₁ of the capacitor C ₁ at the time of three-terminal AC control element Q ₁ is turned off, then a three-terminal AC control elements Q ₁ is the relationship of polarities of the AC power source AC supply voltage at the time of turning on is constant, therefore, the three voltage across the terminals AC control element to Q ₁ immediately before the three-terminal AC control element Q ₁ is turned on is constant. In addition, the polarity of the voltage Vc ₁ of the capacitor C ₁ at the time when the three-terminal AC control element Q ₁ is turned off is the same as that at the time when the three-terminal AC control element Q ₁ is turned on next.
It has a relationship of being superimposed on the power supply voltage of C. Furthermore, as the maximum value voltage Vc ₁ of the capacitor C ₁ satisfies pressure resistance of the three-terminal AC control elements Q _1, is set the time T of the trigger signal. Therefore, the power supply of the oscillating current flowing when the three-terminal AC control element Q ₁ is turned on takes the maximum value under the condition that the withstand voltage performance of the three-terminal AC control element Q ₁ can be satisfied. In this way, the power supply of the oscillating current I ₂ is constant,
Moreover, since it is the maximum, the high-voltage pulse applied to the high-pressure discharge lamp DL is large and stable at a constant level. Therefore, the startability becomes good.

Furthermore, the output of the low-frequency oscillator circuit 4 becomes High.
When the switching from h to Low and the generation of the high voltage pulse is stopped, the transistor Q ₆ is momentarily turned on and the three-terminal AC control element Q ₇ is triggered and turned on.
The electric charge of the capacitor section 6 in which two capacitors C ₁₁ , C ₁₂ , C ₁₄ , C ₁₅ , C ₁₇ , and C ₁₈ are arranged in two series and three parallel is the resistance R.
It is discharged instantaneously through ₁₆ and the inductor L ₂ . Then, the three-terminal AC control element Q ₇ is turned off when the electric charge of the capacitor section 6 is discharged and the discharge current becomes equal to or less than its own holding current. Therefore, as shown in FIG. 4, an overvoltage is not applied to the three-terminal AC control element Q _1, and an element having low withstand voltage performance can be used alone, so that the cost can be reduced and the cost can be reduced. Furthermore, since the electric charge of the capacitor section 6 is discharged through the inductor L ₂ , it is possible to suppress a rapid change (di / dt) in the discharge current and remove the stress on the three-terminal AC control element Q ₇ . Moreover, since the electric charge of a part of the capacitor section 6 of the capacitor section 5 is discharged, an element having a low withstand voltage performance can be used as the three-terminal AC control element Q ₇ .

(Embodiment 2) FIG. 5 is a circuit configuration diagram showing a second embodiment of the present invention, in which one end of a discharging resistor R ₁₆ is connected to one end of a capacitor section 5 to form a three-terminal AC control element. The circuit configuration and operation are the same as those of the first embodiment except that the series circuit of Q ₇ and the resistor R ₁₆ is connected in parallel to the series circuit of the inductor L ₂ and the capacitor section 5. Therefore, common parts are denoted by the same reference numerals and description thereof is omitted.

In this embodiment, when the generation of the high voltage pulse is stopped, the three-terminal AC control element Q ₇ is turned on to charge the nine capacitors C _{11 to} C ₁₉ forming the capacitor section 5 with the resistance R. _Since it is discharged instantaneously via ₁₆ and the inductor L ₂ , an overvoltage is not applied to the three-terminal AC control element Q ₁ as shown in FIG. 6, and an element having low withstand voltage performance can be used alone, which is inexpensive. Becomes

(Third Embodiment) FIG. 7 is a circuit configuration diagram showing a third embodiment of the present invention. In the circuit configuration of the second embodiment, one end of a three-terminal AC control element Q ₇ is connected to an inductor L.
The circuit configuration and operation are the same as those of the first and second embodiments except that the series circuit of the three-terminal AC control element Q ₇ and the resistor R ₁₆ is connected in parallel to the capacitor unit 5 by connecting to the connection point of ₂ and the capacitor unit 5. It is common. Therefore, common parts are denoted by the same reference numerals and description thereof is omitted.

In the present embodiment, when the generation of the high voltage pulse is stopped, the three-terminal AC control element Q ₇ is turned on to charge the nine capacitors C _{11 to} C ₁₉ forming the capacitor section 5 with the resistance R. _The three-terminal AC control element Q ₁ is not discharged in a breath through ₁₆ and an overvoltage is not applied, and an element having low withstand voltage performance can be used alone, which is inexpensive. (Fourth Embodiment) FIG. 8 is a circuit configuration diagram showing a fourth embodiment of the present invention. In the circuit configuration of the first embodiment, one end of a three-terminal AC control element Q ₇ is connected to an inductor L ₂ and a capacitor section. The circuit configuration and operation are the same except that the series circuit of the three-terminal AC control element Q ₇ and the resistor R ₁₆ is connected in parallel to the capacitor section 5 by connecting to the connection point of 5. Therefore, common parts are denoted by the same reference numerals and description thereof is omitted.

In the present embodiment, when the generation of the high voltage pulse is stopped, the three-terminal AC control element Q ₇ is turned on and the electric charge of the capacitor section 6 is discharged in a breath through the resistor R ₁₆ , and the three-terminal AC control is performed. No overvoltage is applied to the element Q ₁ ,
An element having low withstand voltage performance can be used alone, which is inexpensive. (Fifth Embodiment) FIG. 9 is a circuit configuration diagram showing a fifth embodiment of the present invention. Since the basic configuration is common to that of the first embodiment, the common parts are designated by the same reference numerals. The description is omitted, and only the characteristic parts of the present embodiment will be described.

By the way, in the circuit configuration of the first embodiment,
Is a three-terminal AC control element as shown in FIGS.
Child Q₁Timer circuit IC that is an ON signal to turn on₁of
While the output of the No. pin is High, the low frequency oscillation circuit 4
When the output switches from High to Low, the timer
Circuit IC₁Since the voltage of the No. pin becomes Low, three terminals
AC control element Q₁The trigger signal of is secured for a predetermined time T
3 point AC control at points A and B shown in Fig. 3 (b).
Element Q₁May turn off. So above
Make sure that the trigger signal is always secured for the predetermined time T.
Therefore, in the present embodiment, the timer circuit IC₁Pin number
And a cathode between the output end of the low-frequency oscillator circuit 4 and
Diode D on the side_FourInsert the timer
Circuit IC ₁Pin No. is diode D_FiveAnd resistance R₂₀Directly
Transistor Q through the column circuit_FourBase and timer times
Road IC₁It is connected to the pin No.
There is a characteristic of the state.

That is, in the circuit configuration of this embodiment,
Imma Circuit IC₁For example, while the output of No. pin is High
Timer circuit even if the output of the low-frequency oscillator circuit 4 becomes low
IC ₁The voltage of the No. pin no longer becomes Low.
ing. Therefore, as shown in FIG.
C₁Once the output of the No. pin goes High, the above
Timer circuit IC that is a Riga signal₁The output of pin No.
The fixed time T will always be secured.

(Sixth Embodiment) FIG. 12 is a circuit diagram showing a switching circuit 7 according to a sixth embodiment of the present invention. That is, the present embodiment is characterized in that the switching circuit 7 is used instead of the three-terminal AC control element Q ₁ in the circuit configuration of the first embodiment, and other configurations and operations are the same as those of the first embodiment. Therefore, illustration and description of common parts are omitted.

The switching circuit 7 shown in FIG. 12 is constructed by connecting a series circuit of diodes Da and Db and three-terminal AC control elements Qa and Qb in parallel so that currents flow in opposite directions. As in the first embodiment, the output of the pin No. of the timer circuit IC ₁ is applied as a trigger signal to each of the three-terminal AC control elements Qa and Qb to turn on.
It is supposed to be turned off.

In the present embodiment, the oscillating current I ₂ that flows when the switching circuit 7 is turned on has _two values, namely, the diodes Da and Db and the three-terminal AC control elements Qa and Qb, as shown in FIGS. 13 (c) and 13 (d). Since the current is divided into a series circuit of a set, both the currents I _2a and I _2b flowing through the three-terminal AC control elements Qa and Qb can have a rest period. As a result, when the trigger signals to the three-terminal AC control elements Qa and Qb switch from High to Low after the lapse of a predetermined time T, the zero-cross point (FIG. 13 (b)) of the oscillating current I ₂ immediately after the switch is generated. At the point C), the switching circuit 7 can be surely turned off, and the overvoltage can be surely prevented from being applied to the switching circuit 7.

(Embodiment 7) FIG. 14 shows a seventh embodiment of the present invention.
It is a circuit configuration diagram showing a main part of the embodiment, the basic configuration is
Since it is common to the first embodiment, illustration and explanation of common parts
The description is omitted. By the way, in the above first to sixth embodiments
The commercial AC power supply AC is actually a resistor R _A, Inductor L
_ASource impedance Z_AIs known to exist
Depending on the power supply environment, the resistance R_AAnd Inda
Kuta L_AIt is also known that the value of fluctuates. Also, real
In the circuit configuration of the first embodiment, a three-terminal AC control element Q₁
Oscillation current I that flows when is turned on₂Frequency f₀Is
Inductor L₁Primary winding N₁Inductance value of
It is almost determined by the capacitance value of the capacitor section 5. here
And the resistance R_A, Inductor L_AThe value of
When it moves, the power supply side is seen from between X and Y in FIG.
Npedance Z₁Fluctuates, resulting in high voltage pulses
It will fluctuate and the starting performance will become unstable.

Therefore, in this embodiment, the frequency f _{0 is set.}
L having an impedance value extremely larger than the power source impedance Z _A of the commercial AC power source AC in
_in is added. The capacitor C _in inserted between X and Y is a power factor improving capacitor that is usually used to improve the input power factor of the lighting device. That is, according to the circuit configuration of the present embodiment, the value of the inductor L _in is dominant _in the impedance Z _{2 when the} commercial AC power source AC side is seen from between XY without including the capacitor C _in , so that the power source Depending on the environment, resistance R _A and inductor L _A
The impedance Z ₂ does not change so much even if the value of fluctuates and the power supply impedance Z _A fluctuates, and as a result, the impedance Z ₁ seen from the commercial AC power supply AC side from XY including the capacitor C _in is also changed. It can be less variable. Therefore, the high voltage pulse can be stabilized and the starting performance can be stabilized.

(Embodiment 8) FIG. 15 shows an eighth embodiment of the present invention.
It is a circuit configuration diagram showing a main part of the embodiment, the basic configuration is
Since it is common to the first embodiment, illustration and explanation of common parts
The description is omitted. In this embodiment, both commercial AC power supplies AC are used.
Capacitor C for improving power factor at the end_inAnd inductor L_inDirectly
Connect the column circuit and connect the capacitor C_inAnd Indak
L_inSynthetic impedance Z₃Is the frequency f₀To
Power impedance Z of commercial AC power supply AC_AMore poles
Capacitor C so that it has a small impedance value
_inCapacitance value and inductor L_inSet the inductance value of
I have decided.

That is, according to the circuit configuration of the present embodiment, the above-mentioned combined impedance Z ₃ becomes dominant in the impedance Z _{1 when the} commercial AC power source AC side is seen from between XY, and therefore the resistance R _A depends on the power source environment. Also, even if the value of the inductor L _A fluctuates and the power source impedance Z _A fluctuates, the impedance Z ₁ can be prevented from fluctuating too much. Therefore, the high voltage pulse can be stabilized and the starting performance can be stabilized.

(Embodiment 9) FIG. 16 is a circuit configuration diagram showing an essential part of a ninth embodiment of the present invention. Since the basic configuration is the same as that of the first embodiment, the illustration and description of the common parts are shown. Is omitted. In this embodiment, the inductor L _in is connected to one end of the power factor improving capacitor C _in connected to both ends of the commercial AC power supply AC, and the impedance value of the inductor L _in is the commercial AC power supply AC at the frequency f ₀ . The capacitance value of the capacitor C _in and the inductance value of the inductor L _in are set so as to be significantly larger than the combined impedance value Z ₄ of the power source impedance Z _A and the power factor improving capacitor C _in .

That is, according to the circuit configuration of the present embodiment, the impedance value of the inductor L _in is dominant _in the impedance Z _{1 when the} commercial AC power source AC side is seen from the X-Y side. _{Even if} the values of _A and the inductor L _A fluctuate and the combined impedance Z ₄ fluctuates, the impedance Z ₁ can be prevented from fluctuating too much. Therefore, the high voltage pulse can be stabilized and the starting performance can be stabilized.

In the above first to ninth embodiments, the capacitor section 5 including a plurality of capacitors C ₁₁ is configured to generate a high voltage pulse. However, the present invention is not limited to this, and it is a single capacitor. It goes without saying that it is okay.

[0052]

According to the invention of claim 1, a series circuit of an inductor having an intermediate tap and a high-pressure discharge lamp is connected to both ends of the commercial AC power source, and a connection point between the high-pressure discharge lamp and the commercial AC power source and the inductor. A series circuit of a capacitor and a first three-terminal AC control element is connected between the intermediate tap of and a series circuit of a resistance and a second three-terminal AC control element is connected to both ends of the capacitor. A first control circuit for intermittently turning on the terminal alternating current control element by repeating a period for continuously turning on and off and a rest period; and a second control circuit for turning on the second three-terminal alternating current control element. By intermittently turning on the first three-terminal AC control element, a high-voltage pulse is intermittently applied to the high-pressure discharge lamp to start it, and the high-pressure discharge lamp is stabilized by using the inductor as a current limiting element. Turn on A pressure discharge lamp lighting device, comprising: a voltage across the capacitor when the first three-terminal AC control element is OFF during a period in which the first three-terminal AC control element is continuously turned ON / OFF. The first three-terminal AC control element continues to be turned on for at least a predetermined time so that the peak value of the off-voltage of the first three-terminal AC control element, which is a combined voltage with the commercial AC power supply, is less than or equal to the maximum rating. In the high pressure discharge lamp lighting device provided with a means for operating the capacitor, the second three-terminal AC control element is turned on when switching from a period in which the first three-terminal AC control element is continuously turned on and off to a rest period. Since the second control circuit that discharges the electric charge of the first electric current in a sudden manner through the resistor is provided, when the first three-terminal AC control element is continuously turned on / off, the first control circuit is switched to the idle period. The three Without overvoltage child AC control device is applied, there is an effect that cost can be reduced by use of lower element withstand voltage performance alone.

According to a second aspect of the present invention, a series circuit of a first inductor having an intermediate tap and a high-pressure discharge lamp is connected to both ends of the commercial AC power source, and a connection point between the high-pressure discharge lamp and the commercial AC power source is connected to a first point. A capacitor, a first three-terminal AC control element, and a series circuit of a second inductor are connected between the center tap of the first inductor, and a resistor and a second circuit are provided at both ends of the series circuit of the capacitor and the second inductor. A first control circuit that connects a series circuit of three-terminal AC control elements and intermittently turns on the first three-terminal AC control element by repeating a period for continuously turning on and off and a rest period; A second control circuit for turning on the three-terminal AC control element of
By intermittently turning on the three-terminal AC control element, the high-voltage discharge lamp is intermittently applied with a high-voltage pulse to start the high-pressure discharge lamp, and the high-voltage discharge lamp is stably lit using the first inductor as a current limiting element. A high-pressure discharge lamp lighting device for causing a voltage across the capacitor when the first three-terminal AC control element is OFF during a period in which the first three-terminal AC control element is continuously turned ON / OFF The first three-terminal AC control element is turned on for at least a predetermined time so that the peak value of the off-voltage of the first three-terminal AC control element, which is a combined voltage of the commercial AC power supply and the commercial AC power supply, is equal to or less than the maximum rating. In a high-pressure discharge lamp lighting device provided with a means for continuing, the second three-terminal AC control element is turned on when switching from a period in which the first three-terminal AC control element is continuously turned on / off to a rest period. Ko The resistor charges the capacitor and a second
Since the second control circuit for discharging the electric current suddenly through the inductor of the first three-terminal AC control element is provided, when the first three-terminal AC control element is continuously turned on / off, the first three-terminal AC control element is switched to the idle period. The overcurrent is not applied to the terminal AC control element, the element with low withstand voltage performance can be used independently, and the cost can be reduced. In addition, the capacitor charge is discharged through the second inductor. There is an effect that the time change of the current can be suppressed and the stress on the second three-terminal AC control element can be removed.

According to a third aspect of the present invention, a series circuit of an inductor having an intermediate tap and a high-pressure discharge lamp is connected to both ends of the commercial AC power supply, and a connection point between the high-pressure discharge lamp and the commercial AC power supply and an intermediate portion of the inductor. Between the tap and a series circuit of a first three-terminal AC control element and a series circuit of a plurality of capacitors including a series connection of at least two capacitors, and a series circuit of the capacitor section is connected. A series circuit of a resistor and a second three-terminal AC control element is connected to both ends of a part of the configuration, and a period in which the first three-terminal AC control element is continuously turned on and off and a rest period are repeated to be intermittent. The first control circuit for turning on the second three-terminal alternating current control element, and the first control circuit for turning on the second three-terminal alternating current control element.
By intermittently turning on the three-terminal AC control element, the high-voltage discharge lamp is intermittently applied with a high-voltage pulse to start, and the high-voltage discharge lamp is stably turned on by using the inductor as a current limiting element. A discharge lamp lighting device,
Combined voltage of the voltage across the capacitor and the commercial AC power supply when the first three-terminal AC control element is OFF during the period in which the first three-terminal AC control element is continuously turned ON / OFF A high-pressure discharge lamp provided with means for keeping the first three-terminal AC control element turned on for at least a predetermined time so that the peak value of the off-voltage of the first three-terminal AC control element is below the maximum rating. In the lighting device, when switching from a period in which the first three-terminal AC control element is continuously turned on and off to a rest period, the second three-terminal AC control element is turned on so that a part of the series configuration of the capacitor section is reduced. Since the second control circuit that discharges the electric charge suddenly through the resistor is provided, the first three-terminal AC control element is continuously turned on / off when the period is switched to the idle period. Three-terminal AC Since the overvoltage is not applied to the control element, the element with low withstand voltage performance can be used alone to reduce the cost, and moreover, the part of the electric charge in the series configuration of the capacitor section is discharged. There is an effect that an element having low withstand voltage performance can be used as the three-terminal AC control element.

According to a fourth aspect of the present invention, a series circuit of a first inductor having an intermediate tap and a high-pressure discharge lamp is connected to both ends of the commercial AC power source, and a connection point between the high-pressure discharge lamp and the commercial AC power source is connected to a first point. Between the middle tap of the inductor of 1,
A series configuration of the capacitor section is configured by connecting a series circuit of a first three-terminal AC control element and a second inductor, the series circuit including a series-parallel circuit of a plurality of capacitors including a series connection of at least two capacitors. A series circuit of a resistor and a second three-terminal AC control element is connected to both ends of a series circuit of a part of the second inductor and the second inductor, and the first three-terminal AC control element is continuously turned on / off and a pause. A first control circuit that turns on intermittently by repeating a period and a second control circuit that turns on a second three-terminal AC control element;
By intermittently turning on the first three-terminal AC control element, a high-voltage pulse is intermittently applied to the high-pressure discharge lamp to start it, and the high-voltage discharge lamp is stabilized by using the first inductor as a current limiting element. Is a high-pressure discharge lamp lighting device for lighting the first three-terminal AC control element during a period in which the first three-terminal AC control element is continuously turned on and off Of the first three-terminal AC control element for at least a predetermined time so that the peak value of the off-voltage of the first three-terminal AC control element, which is the combined voltage of the both-end voltage and the commercial AC power supply, is less than or equal to the maximum rating. In the high pressure discharge lamp lighting device provided with means for keeping on,
When the period for continuously turning on / off the three-terminal alternating current control element is switched to the rest period, the second three-terminal alternating current control element is turned on so that a part of the electric charge in the series configuration of the capacitor portion is transferred to the resistance and the second portion. Since the second control circuit that discharges suddenly via the second inductor is provided, the first three-terminal AC control element is switched on and off continuously from the first on-off period to the idle period. The overvoltage is not applied to the three-terminal AC control element, and the element with low withstand voltage performance can be used alone to reduce the cost. Moreover, since the electric charge is discharged through the second inductor, the discharge current is reduced. Of the second three-terminal AC control element can be eliminated by suppressing the time change of the second three-terminal AC control element. With control element There is an effect that it is possible to use a lower element withstand voltage performance Te.

[0056]

[Brief description of drawings]

FIG. 1 is a circuit configuration diagram showing a first embodiment.

FIG. 2 is a waveform diagram for explaining the operation of the above.

FIG. 3 is a waveform chart for explaining the operation of the above.

FIG. 4 is a waveform diagram for explaining the operation of the above.

FIG. 5 is a circuit configuration diagram showing a second embodiment.

FIG. 6 is a waveform chart for explaining the above operation.

FIG. 7 is a circuit configuration diagram showing a third embodiment.

FIG. 8 is a circuit configuration diagram showing a fourth embodiment.

FIG. 9 is a circuit configuration diagram showing a fifth embodiment.

FIG. 10 is a waveform diagram for explaining the above operation.

FIG. 11 is a waveform chart for explaining the operation of the above.

FIG. 12 is a circuit configuration diagram of a main part showing a sixth embodiment.

FIG. 13 is a waveform diagram for explaining the above operation.

FIG. 14 is a circuit configuration diagram of a main part showing a seventh embodiment.

FIG. 15 is a circuit configuration diagram of an essential part showing an eighth embodiment.

FIG. 16 is a circuit configuration diagram of a main part showing a ninth embodiment.

FIG. 17 is a circuit configuration diagram showing a conventional example.

FIG. 18 is a waveform diagram for explaining the above operation.

FIG. 19 is a waveform chart for explaining the above operation.

FIG. 20 is a circuit configuration diagram showing another conventional example.

FIG. 21 is a waveform chart for explaining the operation of the above.

FIG. 22 is a waveform chart for explaining the operation of the above.

[Explanation of symbols]

1 Control Power Supply Circuit 2 Control Circuit 3 Lighting Discrimination Circuit 4 Low Frequency Oscillation Circuit 5 Capacitor Section 6 Capacitor Section Q ₁ First Three-Terminal AC Control Element Q ₇ Second Three-Terminal AC Control Element DL High Pressure Discharge Lamp C _{11 to} C ₁₉ Capacitor L ₁ , L ₂ Inductor R ₁₆ Resistor Q ₆ Transistor

Claims (4)

(57) [Claims] 1. A series circuit of an inductor having an intermediate tap and a high-pressure discharge lamp is connected to both ends of a commercial AC power supply, and a connection point between the high-pressure discharge lamp and the commercial AC power supply and an intermediate tap of the inductor are connected. A series circuit of a capacitor and a first three-terminal AC control element is connected, and a series circuit of a resistor and a second three-terminal AC control element is connected to both ends of the capacitor,
A first three-terminal AC control element is turned on and off intermittently by repeating a period for continuously turning on and off and a rest period.
And a second control circuit for turning on the second three-terminal AC control element, and by intermittently turning on the first three-terminal AC control element, a high voltage pulse is applied to the high pressure discharge lamp. Is a high-pressure discharge lamp lighting device for stably lighting the high-pressure discharge lamp using the inductor as a current limiting element, wherein the first three-terminal AC control element is continuously turned on / off. The peak value of the off-voltage of the first three-terminal AC control element, which is the combined voltage of the voltage across the capacitor and the commercial AC power supply when the first three-terminal AC control element is off during the period So as to be less than or equal to the maximum rating, in a high pressure discharge lamp lighting device provided with means for keeping the first three-terminal AC control element turned on for at least a predetermined time, the first three-terminal AC control element is continuously connected. Turn on / off A high voltage, characterized in that the second control circuit is configured to turn on the second three-terminal AC control element when switching from the intervening period to the rest period to discharge the electric charge of the capacitor suddenly through the resistor. Discharge lamp lighting device. 2. A first inductor having an intermediate tap and a series circuit of a high-pressure discharge lamp are connected to both ends of the commercial AC power source, and a connection point between the high-pressure discharge lamp and the commercial AC power source and a first circuit.
A capacitor, a first three-terminal AC control element, and a series circuit of a second inductor are connected between the inductor and the intermediate tap, and a resistor and a second series capacitor are provided at both ends of the series circuit of the capacitor and the second inductor. A first control circuit that connects a series circuit of terminal alternating current control elements and intermittently turns on the first three-terminal alternating current control element by repeating a period for continuously turning on and off and a rest period; A second control circuit for turning on the three-terminal AC control element is provided, and by intermittently turning on the first three-terminal AC control element, a high voltage pulse is intermittently applied to the high-pressure discharge lamp to start. A high-pressure discharge lamp lighting device for stably lighting the high-pressure discharge lamp using the first inductor as a current limiting element, wherein the first three-terminal AC control element is continuously turned on / off during the period. 3-terminal AC controller So that the peak value of the off-voltage of the first three-terminal AC control element, which is the combined voltage of the voltage across the capacitor and the commercial AC power supply when the power is off, is less than or equal to the maximum rating. In a high-pressure discharge lamp lighting device provided with means for keeping the terminal AC control element continuously turned on for at least a predetermined time, when switching from a period in which the first three-terminal AC control element is continuously turned on / off to a pause period, A high-pressure discharge lamp lighting device comprising the second control circuit for turning on the three-terminal AC control element No. 2 to discharge the electric charge of the capacitor suddenly through the resistor and the second inductor. apparatus. 3. A series circuit of an inductor having an intermediate tap and a high-pressure discharge lamp is connected to both ends of the commercial AC power supply, and a connection point between the high-pressure discharge lamp and the commercial AC power supply and an intermediate tap of the inductor are connected. Connecting a series circuit of a first three-terminal AC control element and a series circuit of a plurality of capacitors including a series connection of at least two capacitors, and A first circuit in which a resistor and a series circuit of a second three-terminal AC control element are connected to both ends, and a period in which the first three-terminal AC control element is continuously turned on / off and a rest period are repeated to turn on intermittently And a second control circuit for turning on the second three-terminal AC control element, and by intermittently turning on the first three-terminal AC control element, a high voltage pulse is applied to the high pressure discharge lamp. Intermittently Is a high-pressure discharge lamp lighting device for stably lighting the high-voltage discharge lamp using the inductor as a current limiting element, the period for continuously turning on / off the first three-terminal AC control element. A first voltage which is a combined voltage of the voltage across the capacitor and the commercial AC power supply when the first three-terminal AC control element is OFF
In a high-pressure discharge lamp lighting device provided with a means for keeping the first three-terminal AC control element turned on for at least a predetermined time so that the peak value of the off-voltage of the three-terminal AC control element is less than or equal to the maximum rating, When switching from the period in which the first three-terminal AC control element is continuously turned on and off to the rest period, the second three-terminal AC control element is turned on to transfer a part of electric charge in the series configuration of the capacitor section to the resistance. A high-pressure discharge lamp lighting device comprising the second control circuit for causing a sudden discharge via a lamp. 4. A first inductor having an intermediate tap and a series circuit of a high-pressure discharge lamp are connected to both ends of the commercial AC power source, and a connection point between the high-pressure discharge lamp and the commercial AC power source is connected to the first point.
Of the plurality of capacitors including a series connection of at least two capacitors between the inductor and the intermediate tap of the inductor, a series circuit of the first three-terminal AC control element and the second inductor And a resistor and a series circuit of a second three-terminal AC control element are connected to both ends of a series circuit of the second inductor and a part of the series configuration of the capacitor section, and a first three-terminal AC control element is connected. ON continuously
A first control circuit for turning on the second three-terminal AC control element and a first control circuit for turning on intermittently by repeating a turn-off period and a rest period are provided. Is turned on intermittently to apply a high voltage pulse to the high pressure discharge lamp intermittently to start the high pressure discharge lamp.
A high pressure discharge lamp lighting device for stably lighting the high pressure discharge lamp by using the inductor as a current limiting element, the first three terminals within a period in which the first three-terminal AC control element is continuously turned on / off. In order that the peak value of the off-voltage of the first three-terminal AC control element, which is the combined voltage of the voltage across the capacitor section and the commercial AC power supply when the AC control element is off, is equal to or less than the maximum rating, In a high-pressure discharge lamp lighting device provided with means for keeping the first three-terminal AC control element continuously turned on for at least a predetermined time, from a period in which the first three-terminal AC control element is continuously turned on / off to a rest period. At the time of switching, the second three-terminal AC control element is turned on to suddenly discharge a part of electric charge in the series configuration of the capacitor section through the resistor and the second inductor.
High-pressure discharge lamp lighting device characterized by comprising a control circuit.