JPH05174987A - Light source lighting device - Google Patents

Abstract

PURPOSE:To provide a light source lighting device of high efficiency in addition to contriving smallness in size and lightness in weight, in the lighting device for general illumination, that is, for continuously emitting light. CONSTITUTION:A lighting circuit A comprises a charge switch S1, capacitor C0 and a discharge switch S2. The capacitor C0 is connected in parallel to a DC power supply DC of voltage higher than lighting voltage of a light source L through the charge switch S1. The light source L is connected in parallel to the capacitor C0 through the discharge switch S2. The charge switch S1 and the discharge switch S2 are alternately on-off turned to charge/discharge the capacitor C0, and the light source L is lighted by a discharge current from the capacitor C0.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light source lighting device for lighting a light source for illumination.

[0002]

2. Description of the Related Art Generally, it is necessary to stabilize discharge lamps such as fluorescent lamps and HID lamps, and even when a low-voltage lamp such as a small halogen bulb can be lit by a commercial power source, for example, 12V from 100V commercial power supply voltage
It is necessary to have a step-down transformer to step down the voltage.

In FIG. 51, when the power switch SW is turned on, the choke coil 7 and the filament f ₁ are supplied from the commercial power source AC.
A general fluorescent lamp lighting device for starting and lighting the fluorescent lamp FL by a kick pulse generated in the choke coil 1 by shutting off the lighting tube GL and a preheating current flowing through the lighting tube GL and the filament f _2. 52 is an example of a circuit, and FIG. 52 uses an inverter device 2 that operates using a DC power source obtained by rectifying and smoothing a commercial power source AC with a rectifier DB and a smoothing capacitor Ca. The inverter device 2 uses a switching element Q as a control circuit IC. By switching, a high-frequency output is generated by a circuit composed of high-frequency choke coils L ₁ , L _2, etc.
An example of a fluorescent lamp lighting device for lighting the fluorescent lamp FL is shown,
It is lighter than the lighting device of FIG.

FIG. 53 shows a lighting device which is used for the purpose of special lighting, but which controls flash light emission of a flash lamp composed of a xenon lamp which is not used for general lighting. Figure 5
3 shows a general flash lamp Xe lighting device,
In this conventional device, a constant current power source 3 is obtained by converting a commercial power source AC into a direct current by a rectifier and adding a choke coil and the like, and a power switch SW is turned on to charge a capacitor Cb. Next, the trigger switch S
When t is turned on, a high-voltage pulse is applied to the proximity conductor M of the xenon lamp Xe by the resistor R ₁ , the capacitor Cc, and the pulse transformer PT, and the discharge current of the capacitor Cb momentarily flows in the flash lamp Xe composed of the xenon lamp, thereby causing flash. The lamp Xe flashes.

The lighting device shown in FIG.
The lighting device is adapted to selectively cause a plurality of flash lamps Xe ₁ ... To emit light. The operation of the lighting device shown in FIG. 54 will be described. First, a high voltage is applied to one of the flash lamps Xe ₂ from the high voltage DC power supply circuit 4 ₂ and the other flash lamp Xe ₂ is applied.
It is assumed that a high voltage is not applied to e _{1 from} the DC high-voltage power supply circuit 4 ₁ , and when the clock pulse CK is output from the clock pulse generation circuit 6 in this state, the gate pulse generation circuit 5 ₁ uses this clock. Upon receiving the pulse CK, a gate pulse is given between the gate and cathode of the thyristor SCR ₁ . Then, the thyristor SCR ₁ is turned on, the charge accumulated in the capacitor Cd is discharged, and the choke coil 7 _{1 and the} charging / discharging capacitor Ce cause a resonance phenomenon to be charged.

When the charging voltage Vcd of the charging / discharging capacitor Cd reaches about twice the charging voltage Vcc of the smoothing capacitor Cc, the thyristor SCR ₁ is turned off.
On the other hand, the clock pulse CK is the trigger pulse generation circuit 9 ₁ ,
9 ₂ and sends a trigger pulse to each flash lamp X.
e _1, the trigger electrode ₈₁ of the Xe _2, is applied to the 8 _2. By the way, since the flash lamp Xe ₂ is in the state in which the high voltage is applied as described above, a minute discharge is continuously generated in the flash lamp Xe ₂ when the trigger pulse is applied. On the other hand, since the high voltage from the DC high-voltage power supply circuit 4 ₁ to the flash lamp Xe ₁ is not applied, the micro discharge does not occur.

Then, the clock pulse CK is delayed by the delay circuit 10.
When it is sent to the gate pulse generating circuit 5 ₂ after being delayed by a predetermined time, a gate pulse is generated and the thyristor SCR ₂
Is turned on, the charge of the charging / discharging capacitor Cd is discharged, and the flash lamp Xe ₂ selectively emits flash light.
Reference numeral 11 is a rectifying circuit, 7 ₂ is a choke coil, and SW ₁ is a changeover switch.

[0008]

By the way, in a fluorescent lamp lighting device using the choke coil 1 of FIG. 51 as a ballast or a lighting device using a step-down transformer for lighting a low-pressure halogen lamp, the device becomes large in size and heavy in weight. Besides being heavy,
There is a problem in that the ballast and the transformer make a noise and the efficiency is low.

Further, the lighting device using the inverter device 2 of FIG. 52 has improved the problem of the conventional example of FIG. 51, but the high frequency choke coils L ₁ and L ₂ still remain,
It cannot be said that it has been sufficiently miniaturized. 53 and 54.
The lighting device of (1) is a lighting device that causes a flash lamp to emit flash light, and therefore is not suitable as a lighting device for general lighting that obtains continuous light emission because of flicker.

FIG. 55 shows the relationship between the critical fusion frequency CFF and the brightness. If the curve of FIG. 55, that is, at a frequency above the critical fusion frequency CFF, an unpleasant flicker is felt and it cannot be used for general lighting applications. .. The present invention has been made in view of the above problems, and an object of the present invention is to provide a lighting device for general lighting, that is, for continuously emitting light, which can be reduced in size and weight and which is a highly efficient light source. To provide a lighting device.

[0011]

In order to achieve the above object, the invention according to claim 1 connects a charging switch and a DC circuit of a capacitor in parallel with a DC power supply having a voltage higher than a lighting voltage of a light source. At the same time, a discharge switch and a series circuit of a light source are connected in parallel to the capacitor to form a lighting circuit, and the charge switch and the discharge switch are alternately turned on and off to charge and discharge the capacitor. The light source is turned on by the discharge current and the lighting frequency of the light source is set to the critical fusion frequency or higher.

According to a second aspect of the present invention, in the first aspect of the present invention, the capacitance of the capacitor, the voltage of the DC power supply, the ON period of the charging switch, the OFF period of the discharging switch, the charging / discharging repetition frequency, The current is set to be approximately the rated current of the light source. According to a third aspect of the invention, in the first aspect of the invention, a charging switch,
A lighting circuit is configured by using a plurality of sets of discharge switches and capacitors.

According to a fourth aspect of the present invention, in the invention according to the third aspect, the charging switch and the discharging switch are turned on,
The off period is sequentially shifted for each group. Claim 5
In the invention described in claim 4, in the invention according to claim 4, the ON period of the discharge switch of each set is set such that the discharge currents flowing to the light source when the discharge switch is turned ON are partially overlapped between the adjacent sets. is there.

According to a sixth aspect of the invention, in the third aspect of the invention, each charging switch and capacitor are connected to a plurality of DC power supplies having different voltages. According to a seventh aspect of the invention, in the third aspect of the invention, the discharge period of each set of capacitors is controlled to change the luminous flux of the light source. According to an eighth aspect of the invention, in the first aspect of the invention, a discharge switch is provided in parallel with the capacitor,
The starting switch, the impedance, and the series circuit of the other filament of the light source are connected through one filament of the preheating type light source. The invention according to claim 9 is
As the starting switch of the invention according to claim 8, a semiconductor switch having a constant voltage threshold value is used.

According to a tenth aspect of the present invention, in the first aspect of the invention, the capacitor is charged and discharged by turning on the discharge switch a plurality of times with respect to one turn-on of the charge switch, and the light source The lighting frequency is increased. In the invention according to claim 11, in the invention according to claim 1, the discharge switch is turned on once for a plurality of times the charge switch is turned on to charge and discharge the capacitor, and the lighting frequency of the light source is gradually reduced. It was done.

According to a twelfth aspect of the present invention, in the first aspect of the present invention, the charging switch is connected to a low-voltage DC power supply having a voltage lower than the lighting voltage of the light source, and a plurality of capacitors are connected when the charging switch is turned on. Is charged in parallel with a low voltage DC power supply, and a plurality of capacitors are connected in series when a discharge switch is turned on to obtain a DC power supply voltage higher than the lighting voltage of the light source.

According to a thirteenth aspect of the present invention, the capacitor group of the booster circuit according to the twelfth aspect of the present invention is composed of capacitors having the same capacitance. The invention of claim 14 is
According to the invention of claim 13, a booster circuit is used in which the boost ratio is high at the time of starting the light source and is low so that the voltage is close to the lighting voltage of the light source at the time of steady lighting.

According to a fifteenth aspect of the invention, in the invention of the fourteenth aspect, the capacity of the capacitor of the booster circuit used only for boosting for starting is made smaller than the capacity of the capacitor used for steady lighting. According to a sixteenth aspect of the invention, in the first aspect of the invention, the plurality of capacitors are connected to the high voltage DC power supply through the charging switch, the plurality of capacitors are serially charged when the charging switch is turned on, and the plurality of capacitors are charged when the discharging switch is turned on. It is provided with a step-down circuit for obtaining a DC power supply voltage of a voltage corresponding to a light source having a low lighting voltage from the voltage of the high-voltage DC power supply by connecting the capacitors in parallel.

According to a seventeenth aspect of the invention, in the invention according to the sixteenth aspect, the capacitor group of the step-down circuit is composed of capacitors having the same capacitance. The invention of claim 18 is
In the invention according to claim 16, a switch means for series connection for connecting a plurality of capacitors in series to a high-voltage DC power supply,
Switch means for parallel connection, which connects the plurality of capacitors in parallel to connect the parallel circuit to the light source in parallel,
It is provided with a step-down circuit that charges a plurality of capacitors in series with a high-voltage DC power supply and alternately turns on and off both switch means so as to connect the plurality of capacitors in parallel when discharging to a light source.

According to a nineteenth aspect of the present invention, in the eighteenth aspect of the present invention, the series connection switch means and the parallel connection switch means are constituted by diodes, and each capacitor is connected in series to charge when the charging switch is turned on. The direction of the diode of the switch means for series connection is set in the direction of turning on, and the direction of the diode of the switch means for parallel connection is set in the direction of discharging each capacitor in parallel to the light source when the discharge switch is turned on.

According to a twentieth aspect of the present invention, in the invention according to the first aspect, a capacitor group, a step-up circuit for charging and discharging the capacitor group in parallel, and a step-down circuit for charging and discharging the capacitor group in series can be switched and set. A step-up / down circuit including a switch group is connected to a DC power source via a charging switch. The invention of claim 21 is
In the invention of claim 1, the lamp current of the light source is detected, and the switching of the charging switch and the discharging switch is controlled according to the detected lamp current to increase or decrease the current flowing through the light source to control the luminous flux. ..

According to a twenty-second aspect of the invention, in the invention of the first aspect, a DC voltage lower than the lighting voltage of the light source is added to the light source as a bias voltage. The invention described in claim 23 is the invention described in claim 22, wherein a voltage from another DC power supply is applied to the light source as a bias voltage. According to a twenty-fourth aspect of the present invention, in the first or third aspect of the invention, a polarity reversing circuit including a bridge-connected switch group is interposed between the light source and the lighting circuit.

According to a twenty-fifth aspect of the invention, in the invention of the twenty-fourth aspect, the switch in the switch group of the polarity reversing circuit is also used as the discharging switch of the lighting circuit.
The invention of claim 26 is the same as the invention of claim 1,
A polarity reversing circuit consisting of a switch group bridge-connected is interposed between the DC power supply and the lighting circuit.

According to a twenty-seventh aspect of the invention, in the invention of the twenty-sixth aspect, the switch in the switch group of the polarity reversing circuit is also used as the charging switch of the lighting circuit.
According to a twenty-eighth aspect of the present invention, in the first or third aspect of the present invention, a series circuit of a filament of one of a capacitor, a charging switch, and a light source is connected to a DC power source, and the filament is preheated by a capacitor charging current. To do.

According to a twenty-ninth aspect of the invention, two sets of the lighting circuit according to the first aspect are used, and the outputs of the respective lighting circuits are alternately connected to the light source. The invention according to claim 30 is characterized in that a first charging / discharging switch and a series circuit of a first capacitor, and a second circuit
A circuit in which a series circuit of the charging / discharging switch and the second capacitor is connected in parallel is connected to a DC power source in parallel, and a connection point between the first charging / discharging switch and the first capacitor and a second charging / discharging circuit. A light source is connected between the switch and a connection point of the second capacitor, the first charging / discharging switch and the light source are connected when the first capacitor is discharged, and the first switch is connected when the second capacitor is discharged. And a lighting circuit for supplying an electric current to the light source via the light source and the light source.

According to a thirty-first aspect of the invention, in the thirtieth aspect of the invention, one filament of the preheating type light source is connected between the first charging / discharging switch and the first capacitor, and the other of the light sources is connected. The filament is connected between the second charge / discharge switch and the second capacitor to form a filament preheating circuit. According to a thirty-second aspect of the present invention, the lighting circuit according to the first aspect is connected to a plurality of DC power supplies, and the light source is individually turned on by each lighting circuit.

According to a thirty-third aspect of the invention, in the thirty-second aspect of the invention, each lighting circuit is connected in parallel to the DC power source through a common polarity reversing circuit composed of a bridge-connected switch group. The invention of claim 34 is the same as claim 32.
In the invention described above, a polarity reversing circuit composed of a switch group bridge-connected between each lighting circuit and each light source is separately connected.

According to a thirty-fifth aspect of the invention, in the invention of the first aspect, a plurality of series circuits of a discharge switch and a light source are connected in parallel. According to a thirty-sixth aspect of the present invention, in the thirty-second or thirty-fifth aspect of the present invention, the light emitting color of each light source is made different so as to increase or decrease the luminous flux of each light source. The light source lighting device according to claim 33 or 36.

According to a thirty-seventh aspect of the invention, in the invention according to the thirty-sixth aspect, one variable color lamp in which a plurality of anodes are provided instead of each light source is used. According to a thirty-eighth aspect of the present invention, in the thirty-seventh aspect of the present invention, a charging current for the capacitor is applied to the common cathode of the variable color lamp.

[0030]

A series circuit of a charging switch and a capacitor is connected in parallel with a DC power source having a voltage higher than the lighting voltage of the light source, and a series circuit of a discharging switch and a light source is connected in parallel with the capacitor. A lighting circuit is configured, charging and discharging switches are alternately turned on and off to charge and discharge the capacitor, and the light source is lit by the discharge current from the capacitor. Therefore, the current limiting element as in the past is not necessary, and since the whole circuit can be easily made into a semiconductor because it can be composed of a capacitor and a switch, it is easy to make the device small, lightweight and thin. As a result, it is possible to increase the degree of freedom in the design of the luminaire that incorporates the device, and further set the lighting frequency of the light source to the critical fusion frequency. The above settings have the effect of eliminating the inconvenient flickering of light, and when the light source is removed, the discharge path of the capacitor is cut off and the voltage of the capacitor remains at a constant voltage. Therefore, there is no current flowing through the circuit element, and stress on the circuit element is small.

Further, since the lamp current is determined by the charge charge amount and the discharge charge amount of the capacitor, the capacitance of the capacitor, the voltage of the DC power supply, the ON period of the charging switch, the OFF period of the discharging switch, and the charging / discharging repetition frequency are appropriately set. By setting, it is possible to flow a substantially rated current to the light source,
Alternatively, an arbitrary current can be passed. A lighting circuit is constructed using multiple sets of charging switches, discharging switches and capacitors, the ON and OFF periods of the charging and discharging switches are sequentially shifted for each set, and the light source is turned on when the discharging switch is turned on. The lamp current flowing to the light source is set to 0 by setting the ON period of the discharge switch of each set so that the discharge currents flowing in the adjacent sets partially overlap each other.
As a result, there is no need to apply a high voltage as the re-ignition voltage of the light source, it is possible to use a DC power source with a low voltage, and a DC-like optical output is obtained, so that high-quality lighting with no flicker is obtained. Obtainable.

By connecting each charging switch and capacitor to a plurality of DC power supplies having different voltages, it is possible to increase or decrease the lamp current and change the luminous flux without changing the frequency. It is also possible to change the luminous flux of the light source by controlling the discharge period of each set of capacitors.

In addition, a discharge switch in parallel with the capacitor,
The preheating type light source can be turned on by connecting the starting switch, the impedance, and the series circuit of the other filament of the light source through one filament of the preheating type light source. If a semiconductor switch having a constant voltage threshold is used as the starting switch, the preheating current after starting lighting can be cut off.

The charging switch is turned on a plurality of times with respect to one turn-on of the charging switch to charge and discharge the capacitor to increase the lighting frequency of the light source.
An inconvenient frequency can be avoided if the discharge switch is turned on once for a plurality of times the charge switch is turned on to charge and discharge the capacitor and the lighting frequency of the light source is gradually reduced.

The charging switch is connected to a low-voltage DC power supply having a voltage lower than the lighting voltage of the light source, a plurality of capacitors are charged in parallel by the low-voltage DC power supply when the charging switch is turned on, and a plurality of capacitors are charged when the discharging switch is turned on. By providing a booster circuit that connects the capacitors in series to obtain a DC power supply voltage that is higher than the lighting voltage of the light source, it is possible to light a light source whose lighting voltage is higher than the voltage of the DC power supply used.

By using a booster circuit having a high boosting ratio at the time of starting the light source and a low boosting ratio so that the voltage is close to the lighting voltage of the light source at the time of steady lighting, the starting lighting can be ensured and the circuit efficiency can be improved. I can do better. If the capacity of the capacitor of the booster circuit used only for boosting for starting is made smaller than the capacity of the capacitor used for steady lighting,
The capacity of the capacitor used for starting boost is small.

It is connected to a high-voltage DC power supply via a charging switch, a plurality of capacitors are serially charged when the charging switch is turned on, and a plurality of capacitors are connected in parallel when the discharging switch is turned on to change the voltage of the high-voltage DC power supply. If a step-down circuit that obtains a DC power supply voltage of a voltage corresponding to a light source with a low lighting voltage is provided, it is possible to light a light source with a low lighting voltage even when using a DC power supply with a high voltage. ..

The series connecting switch means and the parallel connecting switch means are composed of diodes, and the direction of the diode of the series connecting switch means is set so as to charge the capacitors by connecting the capacitors in series when the charging switch is turned on. If the direction of the diode of the switch device for parallel connection is set so that each capacitor is discharged in parallel to the light source when the discharge switch is turned on, it will be cheaper than when using a switch, and compared to the switch that hits the control signal. The circuit configuration becomes simple.

A step-up / down circuit having a capacitor group and a switch group capable of switching and setting a step-up circuit for charging the capacitor group in parallel and discharging in series and a step-down circuit for charging the capacitor group in series and discharging in parallel is provided via a charging switch. If connected to a DC power supply, the output voltage can be changed according to the lighting voltage of the light source used. By detecting the lamp current of the light source and controlling the switching of the charging switch and discharging switch according to the detected lamp current to increase or decrease the current flowing to the light source and controlling the luminous flux, dimming or constant light output can be achieved. The conversion can be automatically performed according to the detected lamp current.

By applying a DC voltage lower than the lighting voltage of the light source to the light source as a bias voltage, even if the output voltage of the lighting circuit becomes 0, the light source is activated by the bias voltage to eliminate the lamp current idle period. The light output of can be smoothed. If a polarity reversal circuit consisting of a bridge-connected switch group is interposed between the light source and the lighting circuit, or if a polarity reversal circuit consisting of a bridge-connected switch group is interposed between the DC power supply and the lighting circuit, an alternating current is applied to the light source. The lamp current can flow, the life of the AC light source can be improved, and the occurrence of catalysis can be prevented.

If the switch in the switch group of the polarity reversing circuit is also used as the discharging or charging switch of the lighting circuit, the increase in the number of switches can be suppressed even if the polarity reversing circuit is provided. By connecting a series circuit of a capacitor, a charging switch, and one filament of the light source to a DC power supply and preheating the filament with the charging current of the capacitor, the impedance of the filament suppresses the peak value of the inrush current when charging the capacitor. Therefore, the life of the switch in the charging path can be improved, and the one with a small current capacity can be used, and the cost can be reduced.
Moreover, since the preheating current always flows even when the light source is on, it is suitable for a constant preheating type light source.

Since the filament does not enter the discharge path of the capacitor, there is no power loss. 2 lighting circuits
If the outputs of the respective lighting circuits are alternately connected to the light source by using the combination, the same operation and effect as in the case of using the polarity reversing circuit can be obtained. A plurality of light sources can be turned on by connecting the lighting circuits to a plurality of DC power supplies and individually lighting the light sources in each lighting circuit.

If a means for increasing and decreasing the luminous flux of each light source is provided by making the light emitting color of each light source different, it is possible to set any light emitting color as one light source, especially if a variable color lamp is used. , Can handle one light source.

[0044]

EXAMPLES The present invention will be described below with reference to examples. (Embodiment 1) FIG. 1 shows the configuration of the present embodiment 1,
The lighting circuit A of the first embodiment operates by using a DC power source DC as a power source, and includes a charging switch S ₁ composed of a semiconductor switching element, a discharging switch S ₂ and a capacitor C ₀ , and a light source L such as a fluorescent lamp. Light up.

The voltage V _DC of the DC power source DC is set higher than the discharge start voltage of the light source L so that the discharge switch S ₁ and the charge switch S ₂ are alternately turned on and off, and are not turned on at the same time. In the circuit of Figure 1 Thus, at time t ₁ in FIG. 2, when turned on charging switch S _1, the capacitor C ₀ is charged from the DC power source DC, voltage Vc ₀ of the capacitor C ₀ is FIGS. 2 (a) As shown in, the voltage V _DC of the DC power source DC is reached, and at this time, the charging switch S ₁ is turned off and the value of the charging voltage is maintained.

Next, when the discharging switch S ₂ is turned on at the time t _2, the electric charge accumulated in the capacitor C ₀ is discharged through the light source L to cause the light source L to emit light for a moment, and this capacitor C 2
_When the discharge of ₀ is completed, the discharge switch S ₂ is turned off. When the same operation is repeated after time t ₃ , the lamp current I _L , that is, the discharge current of the capacitor C ₀ becomes pulsed as shown in FIG. 2B. If this pulse interval is narrowed,
The light source L will appear to emit continuous light.

This point is particularly important when used for general illumination, and the pulse frequency needs to be set higher than the CFF curve shown in FIG. 55 so as not to cause unpleasant flicker. (Embodiment 2) FIG. 3 shows the configuration of the second embodiment. The lighting circuit A of the second embodiment has a plurality of capacitors C _{01 to} C _0n.
Against, and is configured using a charging switch S ₁₁ to S _1n, the discharge switch S ₂₁ to S _2n.

The charging switches S _{11 to} S _1n are turned on at time t ₁ ,
It is turned on at t ₂ , ... t _{2n-1, and} turned off at times t ₂ , t ₄ , and t _2n . The discharge switches S _{21 to} S _2n are operated at times t ₂ , t ₄ ,
_{Turns on} at t _{2n and} turns off at times t ₃ , t ₅ , ... t _{2n + 1} . With this configuration, the voltages Vc ₀₁ , Vc ₀₂ , and Vc _0n of the capacitors C ₀₁ , C ₀₂ , and C _0n are as shown in FIGS. 4A to 4C, and the current IL of the light source _L is as shown in FIG. 4D. It is clear from the description of the first embodiment that the above flow occurs.

The current I _L has a low peak value when the same lamp current I _L as in the first embodiment is obtained by increasing the numbers of the capacitor C _{0, the} charging switch S ₁ and the discharging switch S ₂ in this way. It is possible to obtain a fine pulsed lamp current I _L with a narrow pulse interval, and to reduce the impact on the light source L. Figure 5 is a switch S ₁₁ ~ for charging
The case where the discharge currents of the capacitors C _{01 to} C _0n , that is, the current pulses of the light source L are made to overlap little by little when the on and off timings of S _1n and the discharge switches S _{21 to} S _2n are shifted is shown. In this case, the pulses of the lamp current I _L slightly overlap each other as shown in FIG.
The time when the lamp current I _L becomes 0 can be eliminated.
FIG (a) ~ (c), the capacitor C _01, C _02, shows the charging voltage Vc ₀₁ to Vc _0n of the capacitor C _0n.

In the case of FIG. 5, once the light source L is turned on, the lamp current I _L does not become 0 after that.
There is a feature that it is not necessary to apply a high voltage as the re-ignition voltage of the light source L, and the value of the voltage V _DC of the DC power supply DC can be lowered. In this case, each capacitor C
By increasing the degree of overlap of the discharge currents of _{01 to} C _0n , a lamp current I _L close to direct current can be obtained, so that the flicker of the light flux from the light source L can be suppressed to a low level, and high quality illumination can be obtained. It will be possible.

(Third Embodiment) This third embodiment is a specific embodiment corresponding to the first embodiment. As shown in FIG. 6, the DC power source DC is a commercial power source AC via a noise prevention filter FT.
After full-wave rectification by rectifier DB, smoothing capacitor Ca
Then, the lighting circuit A is driven by this DC power supply DC.

The lighting circuit A includes a capacitor C.₀The transition
Switch S for charging₁DC power supply via
Connected between the output ends of the
SA C ₀Discharge switch consisting of a transistor between both ends of
S₂Are connected through. Between the outputs of the DC power supply DC
A trigger pulse generator PG is connected to the
The trigger pulse generator PG is a charging switch S.₁, Discharge
Switch S₂The base of this is shown in Figures 7 (a) and 7 (b).
The pulse width is T₁, T₂Trigger pulse g₁, G₂Apply
And charging switch S₁, Discharge switch S₂Alternately
Turn off.

When the charging switch S ₁ is turned on, the capacitor C ₀ ,
When the capacitor C ₀ is first charged through the path of the charging switch S ₁ and point b and the trigger pulses g ₁ and g ₂ are inverted, the charging switch S ₁ is turned off and then the discharging switch S ₂ is turned on. The electric charge stored in the capacitor C ₀ is discharged through the capacitor C ₀ , the light source L, and the discharging switch S ₂ .
Here, the light source L has a starting switch G connected between the non-power source side ends of the filaments f ₁ and f ₂ on both sides via an impedance element Z, and at the time of starting, this starting switch G
The capacitor C ₀ is discharged by turning on the capacitor C ₀ , the filament f ₁ , the starting switch G, the impedance element Z, the filament f ₂ , and the discharging switch S ₂ in order to turn on.
The filaments f ₁ and f ₂ of the light source L are preheated by flowing through the light source L, and after the light source L is sufficiently preheated, the starting switch G is turned off to turn on the light source L.

Therefore, in the light source L, the lamp current I _L due to the repeated discharge of the capacitor C ₀ shown in FIG.
As shown in (d), a current flows and stable lighting is performed.
When a high-intensity high-pressure discharge lamp (abbreviated as HID lamp here) is used as the light source L, depending on the lighting frequency,
There is a phenomenon that the lighting state becomes unstable due to acoustic resonance.
In order to avoid such a frequency, the number of times the discharging switch S ₂ is turned on is divided into several times with respect to the charging switch S _{1 being} turned on once by the trigger pulse g ₁ shown in FIG. And the trigger pulse g as shown in FIG.
₂ is generated several times in the non-generation period of the trigger pulse g _2, the discharge by the discharge switch S ₂ is divided into several times, it is possible to lower the operating frequency. Of course, the audible frequency can be avoided by charging the capacitor C ₀ , that is, by turning the charging switch S ₁ on and off by dividing it into several times and by turning on and discharging the discharging switch S ₂ once. Also it once charged Kon'ndensa C _0, the number of times of divided charging, once the discharge of the capacitor C _0, also to avoid the undesirable frequency in combination with the large number of divided discharge. Furthermore, FIG.
Needless to say, it is possible to easily avoid an inconvenient frequency by using the circuit shown in FIG.

The capacitor C ₀ is charged when the charging switch S ₁ is turned on, and the charging current is supplied to the trigger pulse generator P.
G detects and obtains a timing signal for alternately turning on and off the switches S ₁ and S ₂ . (Fourth Embodiment) FIG. 9 shows the circuit configuration of the fourth embodiment. In this embodiment, a booster circuit 20 for boosting the voltage V _DC of the DC power supply DC is provided.

The booster circuit 20 has a DC power source DC and a switch.
S₃₁And capacitor C₁₁And switch S ₃₁Switch interlocked with
Chi S₃₁The series circuit is connected in parallel, and the switch S₃₁Through
And switch S₃₂And capacitor C₁₂And switch S₃₂To
Interlocking switch S₃₂’Series circuit parallel to DC power supply DC
Column connection, and the above switch S₃₁, S₃₂In series with
Chi S₃₃Connect these switches S₃₁~ S₃₃Series circuit of
Through the capacitor C ₀Is connected to the DC power supply DC
It And switch S₃₁And capacitor C₁₁In the series circuit
Switch S in parallel₃₂, S₃₃Is linked with the ON operation of
Switch S ₄₁And switch S₃₂And con
Densa C₁₂In the series circuit of switch S₃₃Sui that works with
Touch S₃₃’Are connected in parallel.

The booster circuit 4 operates as follows.
First, when both the switches S ₃₁ and S ₃₁ ′ are turned on as shown in FIG. 10A, the capacitor C ₁₁ is charged to the voltage V _DC of the DC power supply DC as shown in FIG. 10F. Next, when the switches S ₃₁ , S ₃₁ ′ are turned off and the switches S ₃₂ , S ₃₂ ′, and the switch S ₄₁ are turned on as shown in FIGS. 10B and 10C, the capacitor C ₁₂ becomes the capacitor C ₁₁ Since it is charged by the series circuit of the DC power supply DC and the capacitor C ₁₁ through, the voltage is doubled as the voltage V _DC of the DC power supply DC as shown in FIG.

Next, the switches S ₃₂ and S ₃₂ ′ are turned off, and as shown in FIG.
When the switches S ₃₃ and S ₃₃ ′ are turned on as shown in 0 (d), the capacitor C ₀ is connected to the DC power source DC and the capacitor C ₁₁
Is charged by a series circuit of the capacitor C ₁₂ and, therefore, it is charged to four times the voltage V _DC of the DC power supply DC. That is, the switches S ₃₃ and S ₃₃ ′ constitute a charging switch of the lighting circuit A.

The voltage Vc ₀ of the capacitor C ₀ shown in FIG. 10 (h) is Vc ₀ = 2 _{n -1 VDC} . (Where n is the number of capacitors) off the and switches S _33, S ₃₃ 'and S _41, when the discharge switch S ₂ is turned on as shown in FIG. 10 (e), the light source charges the capacitor C ₀ is When discharged to L, the lamp current I _L flows as shown in FIG. 10 (i),
The light source L is turned on.

Although the number n of capacitors including the capacitors C ₁₁ and C ₁₂ in the booster circuit 20 is 3 in the fourth embodiment, the number of capacitor groups and the number of switch groups in the booster circuit 20 are increased. As a result, an output obtained by boosting the DC input voltage is obtained. Therefore, it is effective in the case of lighting the light source L having a higher lamp voltage than the voltage V _DC of the DC power supply DC.

The capacitor C ₀ of the lighting circuit A is omitted,
Of course, it is possible to give the functions to the capacitors C ₁₁ and C ₁₂ . In this case, it is desirable that the capacitance relationship be C ₁₁ > C ₁₂ . Further, in the circuit of the fourth embodiment, when high voltage is required at the time of starting the light source L, all the boosting operations of the booster circuit 20 are performed, and when the output voltage after lighting may be low, the switch S _{32 is used.} ON, switch S ₃₂ '
When is fixed to OFF, the lighting state of the light source L can be maintained by the voltage V _DC of the DC power supply DC, and the circuit efficiency is improved,
There is an advantage that the capacity of the capacitor C ₁₂ can be small.

In the circuit configuration of the fourth embodiment, the booster circuit 20 has a switching circuit.
Itch S₃₁... and discharge switch S ₂As a transition
Using a semiconductor switch such as a star
₃₁The on / off drive of the trigger pulse generator PG described above
By doing so, it is possible to easily configure. (Fifth Embodiment) FIG. 11 shows a circuit configuration of the fifth embodiment.
In this embodiment, on the contrary to the fifth embodiment, the DC power source D
C voltage V_DCExample using a step-down circuit 21 for stepping down
In this example circuit, charging of the lighting circuit A is shown.
Switch for the switch and the switch in the step-down circuit 21
Also used as a capacitor and switch S₅₁, Conde
Sensor C_{twenty one}, Switch S₅₁Switch S that interlocks with₅₂, Con
Densa C_{twenty two}, Switch S₅₁Switch S that interlocks with₅₃,
C Densa C_{twenty three}Connect the series circuit of
C Densa C_{twenty one}Switch S on both ends of₆₁, S₆₂Each in series
Connected to the capacitor C_{twenty two}Switch on both ends of
S₆₃, S₆₄Are connected in series, and a capacitor C_{twenty three}of
Switch S on both ends₆₅ , S₆₆Connect each in series,
These series circuits are each a discharge switch S for discharging.₂Through
It is connected in parallel to the light source L. Switch S above₆₁~ S₆₆Is
It works together.

Next, the operation of this embodiment will be described. First, when the switches S _{51 to} S ₅₃ are turned on as shown in FIG. 12A, the respective capacitors C _{21 to} C ₂₃ are set so that the voltage V _DC of the DC power supply DC is equally divided into _three by the capacitors C _{1 to} C _3. 12
As shown in (d) to (f), the capacitor C ₁ is charged.
The voltages Vc _{21 to} Vc ₂₃ across the series circuit of C ₃ to C ₃ are shown in FIG.
As shown in (g), it becomes the voltage V _DC of the DC power supply DC.

Next, when the switches S _{51 to} S ₅₃ are turned off and the switches S _{61 to} S ₆₆ are turned on as shown in FIG. 12B, the parallel circuit of the capacitors C _{21 to} C ₂₃ outputs the output of the step-down circuit 21. It will be in the state of being connected between the ends. In this state, when the discharging switch S ₂ for discharging is turned on as shown in FIG. 12C, the charges charged in the capacitors C _{21 to} C ₂₃ are discharged to the light source L, and the light source L is discharged to the light source L as shown in FIG. The lamp current I _L shown in (3) flows and the light source L emits light.

As described above, in the fifth embodiment, the DC power supply DC
It is possible to turn on the light source L having a lamp voltage lower than the voltage V _DC . By increasing the number of capacitor groups and the number of switch groups in the step-down circuit 21, respectively, 1 / n
Since a voltage of _VDC is obtained, this circuit is effective when the light source L having a lamp voltage lower than the high power supply voltage is turned on.

In the circuit configuration of the fifth embodiment, the switch S ₅₁ ...
A semiconductor switch such as a transistor is used as S ₆₁ ... And S ₂ , and ON / OFF driving of these switch groups can be easily configured by the above-mentioned trigger pulse generator PG. (Sixth Embodiment) FIG. 13 shows the circuit configuration of the present embodiment. In the sixth embodiment, the discharge current of the light source L is detected by the discharge current detection circuit 30 and fed back to the trigger pulse generator path PG. The charging period of the capacitor C ₀ of the lighting circuit A, the discharge repetition frequency, etc. are controlled so that the lamp current I _L can be controlled to be constant or set to an arbitrary value. It is also possible to control so that any of the lamp current I _L by may added external control signal to the control terminal EXT.

(Embodiment 7) FIG. 14 shows the circuit configuration of this embodiment 7, in which the output light of the light source L is increased by increasing or decreasing the lamp current I _L flowing through the light source L. This enables dimming control. In the embodiment corresponding to FIGS. 1 and 3 described above, the pulse frequency is higher than the critical fusion frequency CCF and the discharge interval of the lamp current I _L is made dense to increase the light intensity, and to make it sparse, the dimming lighting is possible. However, in the seventh embodiment, the DC power supply DC _{1 having} three different voltages V _DC1 , V _DC2 , and V _DC3 ,
This is an example using DC ₂ and DC ₃ .

Now, assuming that the capacitors C ₀₁ , C ₀₂ and C ₀₃ have the same capacity, the DC power supplies DC ₁ , DC ₂ and DC _{3 are used.}
If the relation of the voltage of the voltage V _DC1 <voltage V _DC2 <voltage V _DC3 is satisfied, the lamp current I _{L in} the combined operation of the charging switch S ₁₁ and the discharging switch S ₂₁ is the smallest, and the charging switch S _{12 is} , The lamp current I _L during the combined operation of the charging switch S ₂₂ is medium, the charging switch S ₁₃ ,
Since the lamp current I _{L in} the combined operation of the discharge switches S _{2 3} is the largest, the lamp current I _L can be increased or decreased by switching and using these combinations without changing the frequency.

[0069] FIG. 15 (a) the on-operation of the charging switch S _11, FIG. (B) is an on-operation of the discharge switch S ₂₁ shown respectively, FIG. (G) is a voltage Vc ₀₁ of the capacitor C ₀₁ Change due to charging / discharging, and the lamp current I _L flowing through the light source L when the discharging switch S ₂₁ is turned on is small as shown in FIG. The figure (c) is the ON operation of the charging switch S _12, FIG. (D) shows the ON operation of the discharge switch S ₂₂ shown respectively, FIG. (H) are voltage Vc ₀₂ of the capacitor C ₀₂
Change due to charging / discharging, and the lamp current I _L flowing through the light source L when the switch S ₂₂ is turned on becomes medium as shown in FIG.

Next, FIG. 7E shows the ON operation of the charging switch S ₁₃ , FIG. 6F shows the ON operation of the discharging switch S ₂₃ , and FIG. 7J shows the voltage of the capacitor C ₀₃ . Vc ₀₃
Change due to charging / discharging, and the lamp current I _L flowing through the light source L when the switch S ₂₃ is turned on becomes large as shown in FIG. It goes without saying that the lamp current I _{L in} a wide range can be controlled by further combining the circuit of the seventh embodiment with the frequency.

[0071] As a method for obtaining a DC voltage V _DC differ from one of the DC power source DC is, and the booster circuit 20 in FIG. 9, three different voltage sources as in this embodiment using the step-down circuit 21 of FIG. 11 You can also get it. Further, in FIG. 3, by configuring so that C ₀₁ > C ₀₂ > C ₀₃ , as shown in FIG. 16, each of the combinations of the charging switches S _{11 to} S ₁₃ and the discharging S _{21 to} S ₂₃ is changed. The lamp current I _L can be increased or decreased by the operation. 16 (a)-
(J) corresponds to (a) to (j) of FIG.

Further, it is possible to control the lamp current I _{L with} a wide range in the dish even when the frequency is fixed or by combining variable frequencies. (Embodiment 8) FIG. 17 shows a circuit configuration of this embodiment 8. In this embodiment, for example, a lighting circuit A having the same circuit configuration as that of the embodiment of FIG. Another direct current power supply DC ₀ is connected in series to DC, and the voltage V _DC0 is used as the direct current power supply DC ₀ , and when the light source L is a discharge lamp, the lamp current will increase and the lamp current will continue to increase, causing a runaway critical voltage. Use a power supply that has a low voltage. In Thus to the eighth embodiment circuit, by applying a bias dc voltage V _DC0 in series to the lighting circuit A, the lamp voltage V _L in the charging switch S ₁ is turned off in the lighting circuit A, the discharge switch S ₂ Is on and when charging switch S ₁
But on, at the time the switch ₀₁ is in the off state, the sum voltage of the voltage V _DC0 of the DC power source DC ₀ voltage V _DC of the DC power source DC, between the voltage V _DC0 in FIG 18 (a) Move up and down as shown. The lamp current I _L is a voltage V which is somewhat lower than the critical voltage of the light source L because the light source L is in the active state for a short time at that moment even if the output voltage of the lighting circuit A becomes 0 due to the discharge of the capacitor C _{0. The} lamp current I _L due to _DC0 is shown in FIG.
As indicated by the dotted line in (b), the flow continues with a slight decrease. The current in the dotted line does not increase because the voltage V _DC0 is below the critical voltage. Therefore, within a short time when the slight current on the dotted line reaches 0, the lamp current I _L due to the next discharge
Flowing into the light source L, the lamp current I _L has no rest period, the ions in the light source L do not disappear instantaneously, and the circuit operation can be smoothed.

In the eighth embodiment, the lighting circuit A is small and lightweight.
And further reduction of loss can be achieved. (Ninth Embodiment) In the above eighth embodiment, the DC power supply DC is connected in series.
Another DC power supply DC₀Was connected, but in Example 9
As shown in FIG. 19, the diode is placed between the output terminals of the lighting circuit A.
Mode D ₀DC power supply via₀₁Are connected in parallel.

In this embodiment, the capacitor C of the lighting circuit A is
_{Since the} lamp current I _L flows by the DC power supply DC ₀₁ between the _zero discharge and the next discharge, there is no pause period of the lamp current I _L , and the light output from the light source L becomes smooth and at the same time as in the case of FIG. As described above, the lighting circuit A can be reduced in size, weight, and loss, but in addition, parts having a low withstand voltage can be used for the charging switch S ₁ , the discharging switch S ₂ , and the capacitor C _0. There are advantages.

Further, in the case of this embodiment, since the reverse voltage is applied to the discharging switch S ₂ at the final stage of discharging the capacitor C ₀ in the lighting circuit A, there is an advantage that turn-off becomes easy. Although the DC power source DC ₀₁ uses a power source different from the DC power source DC, the step-up circuit 20 and the step-down circuit 21 shown in FIGS. As a matter of course, it is also possible to make two DC power supplies from one DC power supply DC.

By the way, in each of the above-mentioned embodiments, a current in one direction is applied to the light source L, but in Embodiments 10 to 13 described below, an AC current is applied to the light source L so that the light source L This is aimed at improving the catalysis of light emission and the life of the light source L. (Embodiment 10) In this embodiment, as shown in FIG. 20, a discharging switch S ₂ is provided for a capacitor C ₀ and a polarity inverting circuit B in which switches S _{A to} S _D made of semiconductor switches are bridge-connected. The light source L is connected.

In the polarity inversion circuit B, the switches S _A and S _D and the switches S _B and S _C are turned on and off at the same time, respectively.
_A signal is applied to each gate from a control circuit (not shown) so that _A and _SD and S _B and S _C are alternately turned on and off. Then, first, as shown in FIG. 21A, the charging switch S ₁ is first turned on to charge the capacitor C ₀ , and then the charging switch S ₁ is turned off.

Next, as shown in FIG. 21 (b), the discharge switch S ₂ is turned on, and the discharge switch S ₂ is turned on at the same time or with a slight delay as shown in FIG.
Switch S _A polarity inverting circuit B to (c), when the turns on the S _D, flows charge of the capacitor C ₀ is the discharge switch S _2, switches S _A, a light source L, switch S _D, and the capacitor C ₀ .. When this discharge is finished, the discharge switch S ₂ , switch S _A , and switch S _D are turned off, and at this time, as shown in FIG.
As shown in FIG. 1 (e), the lamp current I _L flows from the bottom to the top in the circuit of FIG.

Then, the charging switch S ₁ is turned on again to charge the capacitor C ₀ , and then the charging switch S ₁ is turned off and the discharging switch S ₂ is turned on. ) are shown as switches S _B, is turned on to S _C, charge the capacitor C ₀ of the capacitor C _0, the discharge switch S _2, switch S _B, the light source L, the switch S _C
And the lamp current I _L flows in the opposite direction.

By repeating the above operation, the lamp current I _L becomes an alternating current. It should be noted that the switches S _A and S _{D are set} for two charging / discharging operations of the capacitor C ₀ by the charging switch S ₁ and the discharging switch S ₂ shown in FIGS.
22C, the switches S _B and S _C are turned on and off, and then the switches S _B and S _C are turned on and off for two times of charging and discharging of the capacitor C ₀ by the charging switch S ₁ and the discharging switch S ₂ . Two
If the lamp current I _L is turned on and off continuously as shown in FIG. 2 (d), the lamp current I _L becomes every two pulses as shown in FIG. 22 (e).
The polarity will be reversed. Of course, it is also possible to invert the polarity after the lamp current I _L having the same polarity is continuously flowed any number of times instead of twice, and therefore the lamp current I _L
The envelope of the lamp current I _{L has} a frequency of 1/2 or 1 /
It is also possible to perform conversion as if it had dropped to n.

(Embodiment 11) FIG. 23 shows a circuit configuration of this embodiment. This embodiment is a light source L such as a fluorescent lamp.
The switch S ₁ for charging is composed of a transistor, and the switches S _{A to} S _D composed of the transistors of the polarity inversion circuit B connected in a bridge function also as the switch for discharging, and the switch S ₁ for charging is Switch S _A ~
A signal for controlling S _D is supplied from the trigger pulse generator PG.

Then, the charging switch S ₁ is shown in FIG.
As shown in (b) and (c), the charges charged in the capacitor C _{1 when} the charging switch S ₁ is turned on once are shown in the switches S _A and S _D and S _B and S _C as shown in FIGS. As shown in the figure, by turning on and off once respectively, the positive and negative polarities are divided and the light source L is discharged as shown in FIG.

When the light source L is started, the filament f of the light source L
A switch Sp connected between the non-power source side ends of ₁ and f ₂ via a resistor R ₀ is turned on and off for a short time, and a preheating current is passed through the filaments f ₁ and f ₂ of the light source L. (Embodiment 12) FIG. 25 shows a circuit configuration of the embodiment 12, and in this embodiment circuit, two sets of DC power supplies DC ₁ and DC _{2 are used.}
And lighting circuits A ₁ and A ₂ are used, and both lighting circuits A ₁ and
The light source L is turned on by alternately switching the direction of the current by A ₂ . In this case, the discharge switches S ₂₁ and S ₂₂ for discharging both lighting circuits A ₁ and A ₂ are prevented from being turned on at the same time.

(Thirteenth Embodiment) FIG. 26 shows a circuit configuration of the thirteenth embodiment. In this embodiment circuit, a polarity reversal circuit B composed of switches S _{A to} S _C bridge-connected to the DC power source DC side is connected. Therefore, in the case of the thirteenth embodiment, the capacitor C ₀ needs to be a bidirectional alternating current. Example 13
Also in this case, the charging switch S ₁ can of course be used as the switches S _{A to} S _C. Since each operation is as described above, the description is omitted.

(Embodiment 14) FIG. 27 shows a circuit of this embodiment 14, in which the DC power supply DC is
A series circuit of a plurality of sets of charging switch S ₁₁ ... and the capacitor C ₀₁ ... and connected in parallel to the capacitor C ₀₁ ... each via a separate discharge switch S ₂₁ ... each input of the polarity inverting circuit B The charging switch S for each charging
₁₁ ..., the discharge switch S ₂₁ ... And the switches S _{A to} S _C are controlled by a trigger pulse generator (not shown), and the light source L
It is designed to pass an alternating current to.

FIG. 28 shows a charging switch S ₁₁ ..., A discharging switch S ₂₁ ... And switches S _{A to} S _{C of the} circuit of the fourteenth embodiment.
Shows a control example, on-off as shown in FIG. 28 (a) ~ (c) the switch S ₁₁ ... sequentially cyclically is charging, the discharge switch S ₂₁ ... switch S ₁₁ ... off for charging Figure 28, cyclically and sequentially in synchronization with the operation
The switches S _A and S _D and the switches S _B and S _{C of} the polarity reversing circuit B are turned on and off as shown in FIGS.
As shown in (g) and (h), the discharge switches S ₂₁ are alternately turned on and off every cycle of the on / off operation. As a result, the electric charge of the capacitor C ₀₁ ... Is sequentially discharged to the light source L, and the current I _{L in} the direction according to the on / off operation of the switches S _A and S _D and the switches S _B and S _C of the polarity inversion circuit B is generated. It flows as shown in FIG. 28 (i).

The control shown in FIG. 28 is suitable for lowering the frequency of the envelope of the current I _L flowing through the light source L. When it is desired to pass a high-frequency current I _L to the light source L, the switches S _A and S _{D of the} polarity reversal circuit B and the switch S corresponding to the on / off state of one of the discharge switches S ₂₁ ... _By alternately turning _B and S _{C on} and off as shown in FIGS. 29A and 29B, the frequency of the current I _L flowing through the light source L can be increased as shown in FIG. 29C.

In the embodiment employing the polarity reversing circuit B, in the case of the light source L of the discharge lamp, the deviation of the light emission in the low temperature atmosphere caused by the concentration of the ions in the light source L on one side, that is, the catalysis phenomenon, Can be prevented. Further, it is possible to prevent the electrode from being worn due to the collision of ions with the electrode in one direction of the light source L, and it is possible to prevent the end portion of the light source L from being blackened and having a short life.

Further, since the switches S _A of the polarity reversing circuit B can also serve as the charging switch or the discharging switch, the number of switches can be suppressed to some extent. Further, it is also possible to use an alternating current capacitor as the charging / discharging capacitor C ₀₁ ..., Which makes it possible to use a capacitor having a long life or a capacitor having little high frequency loss. Further, by combining the switch S _A of the polarity determination circuit B with a charging switch and a discharging switch, it becomes easy to perform extremely fine control, and the frequency of the current I _L flowing through the light source L can be arbitrarily multiplied or decreased. For the light source L where isoacoustic resonance is likely to occur, it is possible to realize the lighting circuit A which avoids the frequency at which acoustic resonance occurs. Moreover, it is possible to prevent noise interference due to avoiding frequencies of other electronic devices.

(Embodiment 15) FIG. 30 shows the operation of this embodiment 15.
A circuit configuration is shown, and this embodiment circuit is similar to the embodiment circuit of FIG.
To turn on a preheated light source L such as a fluorescent lamp
The basic circuit of the lighting circuit A is basically the implementation of FIG.
Same operation as the example circuit. Therefore, of the light source L
When starting, the filament f₁, F₂Between the non-power supply side end of
Starting switch G connected via impedance element Z
Turn on the filament f ₁, F₂Capacitor C₀of
Turn off switch G by discharging electric charge and passing preheat current.
As a result, the light source L has a condenser C₀The voltage of
The light source L is started and turned on.

The operation during steady lighting is similar to that of the circuit of FIG. (Embodiment 16) FIG. 31 shows the circuit configuration of the present embodiment 16. In this embodiment circuit, one end of the capacitor C ₀ is connected to the DC power supply DC via the filament f on one side of the light source L. Therefore, in this embodiment, the filament f can be preheated by using the charging current of the capacitor C ₀ instead of discharging the capacitor C ₀ as in the fifteenth embodiment.

(Embodiment 17) FIG. 32 shows the circuit configuration of the embodiment 16, and this embodiment circuit uses a plurality of capacitors C ₀₁ ... And the lighting circuit A corresponding to the embodiment circuit of FIG. The preheating of the filament f of the light source L is
As in the sixteenth embodiment, the charging current of the capacitor C ₀₁ ... Is used.

When the light source L is preheated by the charging current of the capacitor C ₀ or C ₀₁ ... As in the 16th and 17th embodiments, the filament f is inserted in series in the charging circuit of the capacitor C ₀ or C ₀₁ . Therefore, the charging switch S ₁ ...
It is possible to suppress the peak value of the inrush current into the device, so that the life of those parts can be improved, and inexpensive parts can be used.

Further, since the preheating current can be made to flow by the charging current of the capacitor C ₀ or C ₀₁ even while the light source L is on, it is suitable for the preheating type light source L. Furthermore, when the light source L is removed from the circuit, the condenser C ₀ or C _{01 of the} lighting circuit A ...
Since the charging circuit and the discharging circuit are opened, the operation can be stopped when the light source L is removed, and the circuit can be protected.

In the case of the DC light source L, the filament f can be preheated by matching the polarity to the required cathode side. Further, when the light source L is turned on, the capacitor C
There is no power loss because the impedances of filamentation f do not enter the discharge circuit of ₀ or C ₀₁ .... (Embodiment 18) FIG. 33 shows the circuit configuration of the embodiment 18, and the circuit of this embodiment has two switches S ₀₁ and S ₁ .
And _02, a capacitor C _01, C ₀₂ obtained by bridge-connected, the DC capacitor C ₀₁ via a switch S ₀₁ power D
C, and another capacitor C ₀₁ is connected to the DC power source DC via the switch S ₀₂ , and the connection point between these switches S ₀₁ and C ₀₁ and the connection point between the capacitors C ₀₂ and S _02. And the light source L is connected between.

Therefore, in the eighteenth embodiment, the overlap basically occurs.
Both switches S so that there is no₀₁, S₀₂Figure 34 (a)
As shown in (b), it is designed to be turned on and off alternately.
First, switch S₀₁Is on, switch S₀₂Turns off
And DC power supply DC to switch S ₀₁Through the capacitor
C₀₁As shown in Fig. 34 (c), current flows and
SA C₀₁Is charged. That is, at this time, switch S₀₁Is
C Densa C₀₁It will be a charging switch.

Next, when the switch S ₀₁ is turned off and the switch S ₀₂ is turned on, a current flows from the DC power source DC through the switch S ₀₂ to the capacitor C ₀₂ as shown in FIG. 34 (d),
Is charged capacitor C _02, the capacitor C ₀₁ charges the capacitor C ₀₁ is charged in the previous time, the light source L, the switch S _02, are discharged in the circuit of the capacitor C _01. That is, the switch S ₀₂ constitutes a charging switch for the capacitor C _{02 and} a discharging switch for the capacitor C ₀₁ .

Then, the switch S ₀₁ is turned on and the switch S is turned on.
_{When 02} is turned off, a current flows from the DC power supply DC through the switch S ₀₂ to the capacitor C ₀₁ , the capacitor C ₀₁ is charged again, and at the same time, the electric charge of the capacitor C ₀₂ is charged.
₀₂ , the light source L, the discharge switch S ₂ , and the capacitor C ₀₂ are discharged. That is, the switch S ₀₁ is the capacitor C _{0 1.}
And a discharge switch for the capacitor C ₀₂ at the same time.

By repeating the above operation, the current I _L is reduced by discharging the capacitors C ₀₁ and C ₀₂ .
As shown in (e), it flows into the light source L, and the light source L is turned on. In this embodiment, a DC pulsed current flows through the light source L, but if it is desired to alternately change the polarities, then FIG.
3 and can be easily realized by using the polarity reversing circuit B used in the embodiment of FIG.

[0100] circuit of FIG. 35 shows a specific circuit of the present embodiment circuit, a transistor for a switch S _01, S _02, on-off control of the switches S _01, S ₀₂ is performed by Torigapasu generator PG. As a power source, a pulsating current power source obtained by full-wave rectifying a commercial power source AC with a rectifier DB is used as a DC power source. (Embodiment 19) FIG. 36 shows a circuit of this embodiment 19, which uses a booster circuit 20 'for boosting DC power supply DC as in the embodiment of FIG. When the switch Sp ₁ is turned on, the series connection switch Ss ₁ is turned off, and the discharge switch S ₂ is turned off, the capacitor C is turned on.
₁₁ ... is connected in parallel as shown in FIG. 37 (a) with respect to the DC power source DC, are respectively charged to voltage V _DC of the DC power supply DC. Next, turn off the switch Sp ₁ for parallel connection,
When the serial connection switches Ss ₁ ... Are turned off, the capacitors C ₁₁ ... Are connected in series as they are charged, as shown in FIG. 37 (b).

After that, when the discharge switch S ₂ is turned on,
The electric charge from the series circuit of the three capacitors C ₁₁ ... Is discharged through the light source L to turn on the light source L. Figure 3 here
6. In FIG. 37 (b), a path P shown by a broken line is a path which can change whether or not the voltage V _DC of the DC power supply _DC is further applied to the three capacitors C ₁₁ ... For example, the light source L
If high voltage is required, such as when starting the
It is possible to change the connection of the path P so as to disconnect the DC power supply DC when the lamp voltage of the light source L drops after the start-up lighting, by connecting the capacitors C ₁₁ ... In series with a series circuit.

In the case of the nineteenth embodiment, the capacitors C ₁₁ ... May have the same capacitance, which is advantageous in that the design is easy. Further, the switches Sp ₁ ..., Ss ₁ ..., the capacitor C ₁₁
It is possible to increase the voltage V _DC of the DC power supply DC to an arbitrary ratio by increasing the ... And it can be applied to a wide range from a high watt light source to a low watt light source. See also FIG.
It is needless to say that an AC current can be passed through the light source L by adding the polarity reversing circuit B used in the embodiments of FIGS.

Further, the switches Sp _{1 to} S of the booster circuit 20 'are
It is also possible to use a diode as p ₃ , and instead of changing the connection of the path P, the above operation is performed at the time of start,
After turning on the light source L, turn on the switch Sp ₃ , turn off Sp ₄ ,
By turning off the switch Ss ₃ , the booster circuit 2
It is also possible to switch the output voltage of 0 '. (Embodiment 20) FIG. 38 shows a circuit of this embodiment 20, which is a step-down circuit 21 for lighting the light source L corresponding to a voltage lower than the voltage V _DC of the DC power supply DC. ', And the switch Sp ₁ for parallel connection ...
Is turned off, the switches Ss ₁ for series connection are turned on, and the discharge switch S ₂ is turned off, the capacitor C of the same capacity is turned on.
₂₁ ... are connected in series to the DC power supply DC as shown in FIG. 39 (a), and the voltage across the series circuit is DC power supply DC.
Are respectively charged to the voltage V _DC . Next, the switch Sp ₁ for parallel connection is turned on, and the switch Ss ₁ for series connection is turned on.
When turned off, the capacitors C ₂₁ are connected in parallel as they are charged as shown in FIG. 39 (b), and the output voltage of each step-down circuit 21 'becomes 1/3 of the voltage V _DC of the DC power supply DC. .

After that, when the discharging switch S ₂ for discharging is turned on, the electric charge from the parallel circuit of the three capacitors C ₂₁ ... Is discharged through the light source L and the light source L is turned on. If the number of stages of the switches Sp ₁ ..., Ss ₁ ... And the capacitor C ₂₁ ... Is increased, a further reduced voltage is obtained, and conversely, if the number of stages is reduced, the step-down ratio decreases. It is also possible to change the number of stages at startup and during steady lighting. Needless to say, an AC current can be passed through the light source L by adding the polarity reversing circuit B used in the embodiments of FIGS. 20, 23 and 26.

(Embodiment 21) FIG. 40 shows a circuit of this embodiment 21, which uses a step-down circuit 21 "different from that of the 20th embodiment. , The charging switch S ₁ and the serial connection switch Ss ₁ in the step-down circuit 21 ″ are turned on and the parallel connection switch Sp ₁ is turned off, so that the charging switch S _{1 is} switched from the DC power supply DC. , Capacitor C ₂₁ , switch S
s ₁ , capacitor C ₂₂ , switch Ss ₂ , switch S ₃ ,
A current flows through the circuit of the capacitor C ₁₃ and the capacitor C ₂₁
... is charged.

That is, each capacitor C ₂₁ ...
Is charged to 1/3 of the voltage V _DC . Next, when the parallel connection switch Sp ₁ ... Is turned on and the discharge switch S ₂ is further turned on, a voltage ⅓ of the voltage V _DC of the DC power supply DC is output from the step-down circuit 21 ″ and applied to the light source L. The light source L is turned on.

(Embodiment 22) FIG. 41 shows a circuit of the embodiment 22, which is a diode Ds ₁ instead of the series connection switch Ss ₁ of the step-down circuit 21 "of the embodiment 21. , In which a diode Dp ₁ is used instead of the switch Sp ₁ for parallel connection, three capacitors C ₂₁ are connected in series and charged, and then discharged in parallel.

In the case of the twenty-second embodiment, since the switch may be a diode, there is an advantage that the cost can be reduced. (Embodiment 23) FIG. 42 shows a circuit of this embodiment 23. This embodiment circuit uses a step-up / down circuit 30 which can be switched between a step-up circuit and a step-down circuit by a switch.

That is, when operating as a booster circuit, first, the charging switch S ₁ is turned on, the parallel connection switch Sp ₁ ... is turned on, the series connection switch Ss ₁ ..., and the discharge switches S ₂₁ , S ₂₂ are respectively turned on. Turn off. That is, the capacitors C ₁₁ ... Are connected in parallel and are connected to the DC power supply DC, and each is charged to the voltage V _{DC of the} DC power supply DC.

Next, when the charging switch S ₁ , the parallel connection switch Sp ₁ ... Are turned off and the series connection switch Ss ₁ ... And the discharge switch S ₂₂ are turned on, the three capacitors C ₁₁
Are connected in series and a voltage three times the voltage V _DC of the DC power supply DC is applied to the light source L, and the light source L is turned on. In the case of step-down, first the charging switch S ₁ and the series connection switch S
When s ₁ ... Is turned on and the remaining switches are turned off, the capacitors C ₁₁ ... Are connected in series and charged. Next, when the charging switch S ₁ , the series connection switch Ss ₁ ... Are turned off, and the parallel connection switch Sp ₁ ... And the discharge switch S ₂₁ are turned on, 1/3 of the voltage V _DC of the DC power supply DC is emitted from the light source L. And the light source L is turned on.

As described above, in the twenty-third embodiment, the step-up / down circuit 30 can be switched according to the high-voltage load and the low-voltage light source by operating the switch group, and the required voltage can be output to the light source L in a wide range. There are advantages. By the way, instead of the charging switch S ₁ of the embodiment circuits of FIGS. 40, 41 and 42, a parallel connection switch Sp ₁ ... Or a series connection switch Ss ₁ ... S _2, instead of the S _21, S _22, parallel connection switches Sp ₁ ..., may also be combined switch Ss ₁ ... serial connection.

(Embodiment 24) FIG. 43 shows a circuit of the embodiment 24, this embodiment shows an embodiment for three lights, and the DC power supply DC is turned on in the embodiment of FIG. A circuit
Three sets of _{1 to} A ₃ are connected. Operation of the lighting circuit A ₁ to A ₃ for each light source L ₁ ~L ₃ corresponds to the embodiment of FIG. 31. Although the present embodiment is for three lights, by connecting an arbitrary number of lighting circuits A, it is possible to configure a circuit for lighting an arbitrary number of light sources L.

(Embodiment 25) FIG. 44 shows a circuit of this embodiment 25. This embodiment circuit uses three lighting circuits of the embodiment of FIG. 21 for three lights and shares the polarity inversion circuit B. is doing. By increasing the charging switches S _{11 to} S ₁₃ , the discharging switches S _{21 to} S ₂₃ , the capacitors C _{01 to} S ₀₃ , and the light sources L _{1 to} L ₃ of each lighting circuit AA, the number of lights can be easily increased, and The current flowing through each light source L ₁ can be an alternating current.

The switches S _{A to} S _D in the polarity inverting circuit B are
It is also possible to use it as the charging switch S ₁ for charging. At this time, it is desirable to turn on the charging switches S ₁ ... After the discharge of the electric charges of the respective capacitors C ₀₁ , C ₀₂ and C ₀₃ is completed. (Example 26) FIG. 45 shows the circuit of this embodiment 26, the embodiment circuit which was provided corresponding to the polarity inverting circuit B ₁ ... to each of the light sources L ₁ ..., each light source L ₁ Each polarity reversing circuit B ₁ ... also serves as a switch for discharging the corresponding capacitor C ₀₁ .

This circuit also has a polarity reversing circuit B ₁ ..., a capacitor C ₀₁ ..., a charging switch S ₁₁ ... according to the number of lights.
It is easy to increase the number of lights because only the number of lights is provided. (Embodiment 27) FIG. 46 shows a circuit of this embodiment 27. In this embodiment circuit, in the lighting circuit A, a plurality of discharge switches S ₂₁ are used and each discharge switch S _{21 is used} . the light source L ₁ ... connected in parallel with the capacitor C _0, and is adapted to light up one of the plurality in the capacitor C ₀ of the light source L ₁ ... Te.

FIG. 47 shows operation waveforms of an example of control of the embodiment circuit of FIG. 46. In this case, as shown in FIGS. 47 (a) to (d), the charging switch S ₁ and the discharging switch S ₂₁ ...
Are alternately turned on and off, and the current I _L1 is simultaneously applied to the light sources L ₁ ...
... are turned on and turned on as shown in FIGS. 47 (e) to (f). 48 shows operating waveforms of another example of control of the embodiment circuit of FIG. 46. In the case of the present embodiment, the ON operation cycle of the charging switch S ₁ shown in FIG. 48
As shown in (b) to (d), the discharge switches S ₂₁ are sequentially turned on and off, and a current I _L1 is sequentially supplied to each light source L ₁ .
As shown in (e) to (g), light is made to flow by flowing. In this case, when the light sources L ₁ ... Are viewed as a whole, the light output of each light source L ₁ is continuous, so that there is little flicker and it is possible to increase the flicker frequency to make it hard to see.

(Embodiment 28) FIG. 49 shows a circuit of this embodiment. This embodiment circuit operates by rectifying and smoothing a commercial power supply AC by a rectifying and smoothing circuit 50 to obtain a DC power supply. The lighting circuit A uses a composite light source LL that combines a light source LR that emits red light, a light source LG that emits green light, and a light source LB that emits blue light, and the lighting circuit A shown in FIG. 3 corresponding to each of the light sources LR to LB. The individual lighting circuits AR to AB having the same configuration as the above are provided, and the charging switch S ₁ of each individual lighting circuit AR to AB is provided.
SR～SB, the switching period of the discharge switch SR ₂₁ ... ~SB ₂₁ ..., capacitor CR ₁ ... ~CB ₁ ... brightened individually each light source LR~LB set the capacity of the, dimmed to a composite light source LL The light emission color of the
The light emission ratio can be increased or decreased while the emission ratio of LB is arbitrarily fixed, that is, the light emission can be increased or decreased in the same emission color. Performed by a pulse generator (not shown) when changing charge switch SR ₁₁ ... ~SB ₁₁ ..., the discharge switch SR ₂₁ ... ~SB ₂₁ ... switching period of. The filaments f of the light sources LR to LG are inserted into the charging paths of the capacitors CR _{1 to} CB ₁ of the corresponding individual lighting circuits AR to AB to be preheated by the charging current.

Instead of the composite light source LL, a variable color lamp L'having a structure in which phosphors of three colors of red, green and blue shown in FIG. 50 are applied may be used. In this case, the filament f of the variable color lamp L ′ is inserted into the charging path of the capacitors CR ₁ ... CB ₁ of each of the individual lighting circuits AR-AB for preheating, and common to each of the anodes R, G, B. By controlling the respective currents flowing between the cathode and the electrode of the filament f, it is possible to control the emission color and increase / decrease light similar to the case of FIG.

The switch in each of the above embodiments may be configured by using a semiconductor switch element, or the circuit may be simplified by integrally forming the capacitor and the switch as a semiconductor. Further, it goes without saying that the circuit configuration can be further simplified by integrating the trigger pulse generator PG used for controlling the switch into an IC. Of course, an incandescent light bulb may be used as the light source L. in this case,
It is not necessary to increase the starting voltage, and the output voltage of the lighting circuit A may be the maximum rated lighting voltage.

[0120]

According to the first aspect of the invention, a series circuit of a charging switch and a capacitor is connected in parallel with a DC power source having a voltage higher than the lighting voltage of the light source, and a discharging switch and a light source are connected in parallel with the capacitor. The lighting circuit is configured by connecting the series circuit of, the charging switch and the discharging switch are alternately turned on and off to charge and discharge the capacitor, and the light source is turned on by the discharge current from the capacitor. Is limited by the charge amount of the capacitor,
Therefore, the conventional current limiting element is not required, and since the whole circuit can be easily made into a semiconductor because it can be composed of a capacitor and a switch, the device can be made small, lightweight and thin easily, resulting in a device. It is possible to increase the degree of freedom in the design of lighting fixtures incorporating
Further, since the lighting frequency of the light source is set to be equal to or higher than the critical fusion frequency, there is an effect that it is possible to eliminate inconvenient flicker in the light. Moreover, when the light source is removed, the discharge path of the capacitor is cut off, Since the voltage is maintained at a constant voltage, there is no current flowing through the circuit element, the stress on the circuit element is small, and the reliability can be improved.

Further, since the lamp current is determined by the charge charge amount and the discharge charge amount of the capacitor, the capacitance of the capacitor, the voltage of the DC power supply, the ON period of the charging switch, the OFF period of the discharging switch, and the charging / discharging repetition frequency are appropriately set. By setting, it is possible to flow a substantially rated current to the light source,
Alternatively, an arbitrary current can be passed, and there is an effect that it can be widely applied to light sources of various wattages and various types of light sources.

As in the invention described in claim 3, a lighting circuit is constructed by using a plurality of sets of charging switches, discharging switches and capacitors, or like the invention in claim 4,
The ON and OFF periods of the charging switch and the discharging switch are sequentially shifted for each set, and further, as in the invention of claim 5, the discharging current flowing to the light source when the discharging switch is turned ON is set between adjacent sets. By setting the ON period of each pair of discharge switches so as to partially overlap, the lamp current flowing through the light source is prevented from becoming 0, and as a result, it is not necessary to apply a high voltage as the re-ignition voltage of the light source, There is also an effect that it is possible to use a DC power supply with a low voltage, and a DC-like optical output is obtained, so that high-quality lighting without flicker can be obtained.

According to the sixth aspect of the present invention, by connecting the individual charging switches and capacitors to a plurality of DC power supplies having different voltages, it is possible to increase or decrease the lamp current and change the luminous flux without changing the frequency. it can. In the invention according to claim 7, the luminous flux of the light source can be changed by controlling the discharge period of each set of capacitors.

According to the eighth aspect of the present invention, the discharge switch, the starting switch, the impedance, and the series circuit of the other filament of the light source are connected in parallel to the capacitor through one filament of the preheat type light source. The light source can be turned on. In the invention described in claim 9, since the semiconductor switch having the constant voltage threshold is used as the starting switch, it is possible to interrupt the preheating current after the start lighting.

According to the tenth aspect of the invention, the capacitor is charged and discharged by turning on the discharge switch a plurality of times for one turn-on of the charge switch, thereby increasing the lighting frequency of the light source. Alternatively, it is inconvenient if the discharge switch is turned on once to charge and discharge the capacitor and the lighting frequency of the light source is gradually decreased in response to the charging switch being turned on a plurality of times. You can avoid frequencies.

According to the twelfth aspect of the present invention, the low voltage DC power supply having a voltage lower than the lighting voltage of the light source is connected through the charging switch, and the plurality of capacitors are charged in parallel by the low voltage DC power supply when the charging switch is turned on. Since a booster circuit that obtains a DC power supply voltage higher than the lighting voltage of the light source by connecting multiple capacitors in series when the discharge switch is turned on is provided, the light source whose lighting voltage is higher than the voltage of the DC power supply used is turned on. be able to.

According to the fourteenth aspect of the present invention, since the booster circuit has a high boosting ratio at the time of starting the light source and a low boosting ratio so that the voltage is close to the lighting voltage of the light source at the time of steady lighting, the starting lighting is ensured. It is possible to improve the circuit efficiency. According to a fifteenth aspect of the present invention, the capacitance of the capacitor of the booster circuit used only for boosting for starting is
Since the capacity of the capacitor used for steady lighting is made smaller, the capacity of the capacitor for starting boosting can be made smaller.

According to the sixteenth aspect of the present invention, a plurality of capacitors are connected in series when the charging switch is turned on and are connected to a high voltage DC power supply through a charging switch, and a plurality of capacitors are connected in parallel when the discharging switch is turned on. Since it has a step-down circuit that obtains a DC power supply voltage of a voltage corresponding to a light source with a low lighting voltage from the voltage of the high-voltage DC power supply, even if a high-voltage DC power supply is used, the lighting voltage A low light source can be turned on.

The invention described in claim 18 can obtain the same effect as that of claim 16. According to a nineteenth aspect of the present invention, the switching means for series connection and the switching means for parallel connection are constituted by diodes, and when the charging switch is turned on, the capacitors of the series connection switch means are connected in series to charge the capacitors. Since the direction is set and the direction of the diode of the switch device for parallel connection is set in the direction in which each capacitor is discharged in parallel to the light source when the discharge switch is turned on, it is cheaper than when using a switch, and the control signal The circuit configuration is simpler than that of a switch that hits.

According to the twentieth aspect of the present invention, there is provided a buck-boost comprising a capacitor group, a booster circuit for parallel charging and series discharging of the capacitor group, and a switch group capable of switching setting of a step-down circuit for series charging and parallel discharging of the capacitor group. Since the circuit is connected to the DC power source via the charging switch, the output voltage can be changed according to the lighting voltage of the light source used.

According to a twenty-first aspect of the invention, the lamp current of the light source is detected, and a charging switch is detected according to the detected lamp current.
Since the switching of the discharge switch is controlled to increase / decrease the current flowing in the light source to control the luminous flux, dimming and constant light output can be automatically performed according to the detected lamp current. According to a twenty-second aspect of the present invention, a DC voltage lower than the lighting voltage of the light source is applied to the light source as a bias voltage, so that even if the output voltage of the lighting circuit becomes 0, the light source is activated by the bias voltage and the rest period of the lamp current is reduced. As a result, it becomes possible to smooth the light output of the light source and to use parts with low withstand voltage for the switch and the capacitor.

The invention described in claim 23 can also obtain the same effect as that of claim 22. A polarity reversing circuit composed of a switch group bridge-connected between the light source and the lighting circuit as in the invention of claim 24 is interposed, or a bridge is provided between the DC power supply and the lighting circuit as in the invention of claim 26. By interposing a polarity reversing circuit composed of a connected switch group, an AC lamp current can be supplied to the light source, the life of the AC light source can be improved, and the catalysis phenomenon can be prevented.

The invention according to claim 25 or claim 2
If the switch in the switch group of the polarity reversing circuit is also used as the discharging or charging switch of the lighting circuit as in the invention described in 7, the increase in the number of switches can be suppressed even if the polarity reversing circuit is provided. In the invention according to claim 28, since the series circuit of the capacitor, the charging switch, and the filament on one side of the light source is connected to the DC power source and the filament is preheated by the charging current of the capacitor, the peak of the inrush current at the time of charging the capacitor. The value can be suppressed by the impedance of the filament, therefore the life of the switch in the charging path can be improved, and the one with a small current capacity can be used, which can reduce the cost, and the constant preheating current can be maintained even while the light source is on. Since it flows, it is always suitable for preheating type light source.

Since the filament does not enter the discharge path of the capacitor, there is no power loss. According to the invention described in claim 29, if two sets of lighting circuits are used and the outputs of the respective lighting circuits are alternately connected to the light source, the same effect as in the case of using the polarity reversing circuit can be obtained. According to a thirtieth aspect of the present invention, a circuit in which a series circuit of the first charging / discharging switch and the first capacitor and a second charging / discharging switch and the series circuit of the second capacitor are connected in parallel is used as a DC power source. Connect in parallel,
A light source is connected between a connection point between the first charge / discharge switch and the first capacitor and a connection point between the second charge / discharge switch and the second capacitor, and the first light source is connected when the first capacitor is discharged. The charging / discharging switch and the light source of No. 1 and a lighting circuit for flowing a current to the light source via the first switch and the light source when the second capacitor is discharged are provided. Similar effects are obtained.

According to a thirty-first aspect of the invention, in the thirtieth aspect of the invention, one filament of the preheating type light source is connected between the first charge / discharge switch and the first capacitor, and the other of the light sources is connected. The preheating type light source can be used if the filament is connected between the second charge / discharge switch and the second capacitor to form a filament preheating circuit.

According to a thirty-second aspect of the invention, in the invention of the first aspect, the lighting circuits are connected to a plurality of DC power supplies, and the light sources are individually turned on by the respective lighting circuits. Therefore, the same as the invention of the first aspect. It is possible to turn on a plurality of light sources while obtaining various effects. According to the invention of claim 33, since the respective lighting circuits are connected in parallel to the DC power supply via the common polarity inverting circuit composed of the bridge-connected switches, the polarity inverting circuit can be provided while obtaining the effect of the invention of claim 32. The effect provided is also obtained, and moreover, there is an effect that only one polarity inversion circuit is required.

The invention described in claim 34 can also obtain the same effect as that of claim 33. According to a thirty-fifth aspect of the present invention, since a plurality of series circuits of the discharge switch and the light source are connected in parallel, the same effect as the thirty-second aspect is obtained. According to the thirty-sixth aspect of the invention, since the means for changing the emission color of each light source to increase or decrease the luminous flux of each light source is provided, it is possible to set an arbitrary emission color as one light source. is there.

According to a thirty-seventh aspect of the invention, in the thirty-sixth aspect of the invention, since one variable color lamp in which a plurality of anodes are provided instead of each light source is used, the light source can be treated as one and the variable color lamp can be used. Since the charging current of the capacitor is supplied to the common cathode to preheat the capacitor, the capacitor can be preheated at the same time as charging, and the effect of preheating is the same as that of claim 28.

[Brief description of drawings]

FIG. 1 is a circuit diagram of a first embodiment of the present invention.

FIG. 2 is an operation waveform diagram of the first embodiment of the present invention.

FIG. 3 is a circuit diagram of a second embodiment of the present invention.

FIG. 4 is an operation waveform diagram of an example of a second embodiment of the present invention.

FIG. 5 is an operation waveform diagram of another example of the second embodiment of the present invention.

FIG. 6 is a specific circuit diagram of the third embodiment of the present invention.

FIG. 7 is an operation waveform diagram of an example of a third embodiment of the present invention.

FIG. 8 is an operation waveform diagram of another example of the third embodiment of the present invention.

FIG. 9 is a circuit diagram of a fourth embodiment of the present invention.

FIG. 10 is an operation waveform diagram of the fourth embodiment of the present invention.

FIG. 11 is a circuit diagram of a fifth embodiment of the present invention.

FIG. 12 is an operation waveform diagram of the fifth embodiment of the present invention.

FIG. 13 is a circuit diagram of a sixth embodiment of the present invention.

FIG. 14 is a circuit diagram of a seventh embodiment of the present invention.

FIG. 15 is an operation waveform diagram of an example of a seventh embodiment of the present invention.

FIG. 16 is an operation waveform diagram of another example of the seventh embodiment of the present invention.

FIG. 17 is a circuit diagram of an eighth embodiment of the present invention.

FIG. 18 is an operation waveform diagram of the eighth embodiment of the present invention.

FIG. 19 is a circuit diagram of Embodiment 9 of the present invention.

FIG. 20 is a circuit diagram of Embodiment 10 of the present invention.

FIG. 21 is an operation waveform chart of an example of Example 10 of the present invention.

FIG. 22 is an operation waveform diagram of another example of the tenth embodiment of the present invention.

FIG. 23 is a circuit diagram of Embodiment 11 of the present invention.

FIG. 24 is an operation waveform diagram of the eleventh embodiment of the present invention.

FIG. 25 is a circuit diagram of Embodiment 12 of the present invention.

FIG. 26 is a circuit diagram of Embodiment 13 of the present invention.

FIG. 27 is a circuit diagram of Embodiment 14 of the present invention.

FIG. 28 is an operation waveform chart of an example of Example 14 of the present invention.

FIG. 29 is an operation waveform chart of another example of the fourteenth embodiment of the present invention.

FIG. 30 is a circuit diagram of Embodiment 15 of the present invention.

FIG. 31 is a circuit diagram of Embodiment 16 of the present invention.

FIG. 32 is a circuit diagram of Embodiment 17 of the present invention.

FIG. 33 is a circuit diagram of Embodiment 18 of the present invention.

FIG. 34 is an operation waveform diagram of the eighteenth embodiment of the present invention.

FIG. 35 is a specific circuit diagram of Embodiment 18 of the present invention.

FIG. 36 is a circuit diagram of Embodiment 19 of the present invention.

FIG. 37 is an equivalent circuit diagram for explaining the operation of the nineteenth embodiment of the present invention.

FIG. 38 is a circuit diagram of Embodiment 20 of the present invention.

39 is an equivalent circuit diagram for explaining the operation of Embodiment 20 of the present invention. FIG.

FIG. 40 is a circuit diagram of Embodiment 21 of the present invention.

FIG. 41 is a circuit diagram of Embodiment 22 of the present invention.

FIG. 42 is a circuit diagram of Embodiment 23 of the present invention.

FIG. 43 is a circuit diagram of Embodiment 24 of the present invention.

FIG. 44 is a circuit diagram of Embodiment 25 of the present invention.

FIG. 45 is a circuit diagram of Embodiment 26 of the present invention.

FIG. 46 is a circuit diagram of Embodiment 27 of the present invention.

FIG. 47 is an operation waveform chart of an example of the twenty-seventh embodiment of the present invention.

FIG. 48 is an operation waveform chart of another example of the twenty-seventh embodiment of the present invention.

FIG. 49 is a circuit diagram of Embodiment 28 of the present invention.

FIG. 50 is a circuit diagram in which a part of the power can be saved when another light source of Example 28 of the present invention is used.

FIG. 51 is a circuit diagram of a conventional example.

FIG. 52 is a circuit diagram of another conventional example.

FIG. 53 is a circuit diagram of another conventional example.

FIG. 54 is a circuit diagram of another conventional example.

FIG. 55 is a diagram for explaining the relationship between the critical fusion frequency and brightness.

[Explanation of symbols]

A Lighting circuit DC DC power supply S ₁ Charge switch S ₂ Discharge switch C ₀ Capacitor L Light source

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] September 17, 1991

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0002

[Correction method] Change

[Correction content]

[0002]

In general, fluorescent lamps, in order to light a discharge lamp such as a HID lamp requires a ballast, and also when it is to turn on the miniature halogen bulb such as a low-voltage lamp at a commercial power supply, For example, from a commercial power supply voltage of 100V to 12
A step-down transformer that steps down to V is required.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] 0003

[Correction method] Change

[Correction content]

In FIG. 51, when the power switch SW is turned on, the choke coil 1 and the filament f ₁ are supplied from the commercial power source AC.
A general fluorescent lamp lighting device for starting and lighting the fluorescent lamp FL by a kick pulse generated in the choke coil 1 by shutting off the lighting tube GL and a preheating current flowing through the lighting tube GL and the filament f _2. 52 is an example of a circuit, and FIG. 52 uses an inverter device 2 that operates using a DC power source obtained by rectifying and smoothing a commercial power source AC with a rectifier DB and a smoothing capacitor Ca. The inverter device 2 uses a switching element Q as a control circuit IC. By switching, a high-frequency output is generated by a circuit composed of high-frequency choke coils L ₁ , L _2, etc.
An example of a fluorescent lamp lighting device for lighting the fluorescent lamp FL is shown,
It is lighter than the lighting device of FIG.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction content]

[0008]

By the way, in the fluorescent lamp lighting device using the choke coil 1 of FIG. 51 as a stabilizer and the lighting device using the step-down transformer for lighting the low-pressure halogen lamp, the device becomes large in size and heavy in weight. Besides being heavy,
There is a problem in that the ballast and the transformer make a noise and the efficiency is low.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction content]

[0010] Figure 55 is shows the relationship between the critical fusion frequency CFF and brightness, the curve of FIG. 55, that is, Re only a critical fusion frequency CFF more frequencies unpleasant flickering is felt, in general illumination applications Not available. The present invention has been made in view of the above problems, and an object of the present invention is to provide a lighting device for general lighting, that is, for continuously emitting light, which can be reduced in size and weight and which is a highly efficient light source. To provide a lighting device.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Name of item to be corrected] 0045

[Correction method] Change

[Correction content]

[0045] DC power supply voltage V _DC of DC is set higher than the discharge starting voltage of the light source L, on alternately switch S ₁ for charging and discharge electric switch S _2, so as not to turn on off and and the same time There is. In the circuit of Figure 1 Thus, at time t ₁ in FIG. 2, when turned on charging switch S _1, the capacitor C ₀ is charged from the DC power source DC, voltage Vc ₀ of the capacitor C ₀ is FIGS. 2 (a) As shown in, the voltage V _DC of the DC power source DC is reached, and at this time, the charging switch S ₁ is turned off and the value of the charging voltage is maintained.

[Procedure correction 6]

[Document name to be amended] Statement

[Correction target item name] 0048

[Correction method] Change

[Correction content]

The charging switches S _{11 to} S _1n are _operated at times t ₁ and t
_{It is} turned on at ₃ , ... t _{2n-1, and} turned off at times t ₂ , t ₄ , and t _2n . The discharge switches S _{21 to} S _2n are operated at times t ₂ , t ₄ , ...
It turns on at t _{2n and} turns off at times t ₃ , t ₅ , ... T _{2n + 1} .
With this configuration, the voltage V of the capacitors C ₀₁ , C ₀₂ , C _0n
c _01, Vc _02, Vc _0n is as shown in FIG. 4 (a) ~ (c) , the current I _L of the light source L is allowed to flow as shown in FIG. 4 (d), it is clear from the description of Example 1 ..

[Procedure Amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0049

[Correction method] Change

[Correction content]

The current I _L has a low peak value when the same lamp current I _L as in the first embodiment is obtained by increasing the numbers of the capacitor C _{0, the} charging switch S ₁ and the discharging switch S ₂ in this way. It is possible to obtain a fine pulsed lamp current I _L with a narrow pulse interval, and to reduce the impact on the light source L. Figure 5 is a switch S ₁₁ ~ for charging
The case where the discharge currents of the capacitors C _{01 to} C _0n , that is, the current pulses of the light source L are made to overlap little by little when the on and off timings of S _1n and the discharge switches S _{21 to} S _2n are shifted is shown. In this case, the pulses of the lamp current I _L slightly overlap each other as shown in FIG.
The time when the lamp current I _L becomes 0 can be eliminated.
(A) to (c) of the figure show the voltages Vc _{01 to} Vc _0n at the time of charging and discharging the capacitors C ₀₁ , C ₀₂ and the capacitor C _0n .

[Procedure Amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0054

[Correction method] Change

[Correction content]

Therefore, in the light source L, the lamp current I _L due to the repeated discharge of the capacitor C ₀ shown in FIG.
As shown in (d), a current flows and stable lighting is performed.
When a high-intensity high-pressure discharge lamp (abbreviated as HID lamp here) is used as the light source L, depending on the lighting frequency,
There is a phenomenon that the lighting state becomes unstable due to acoustic resonance.
In order to avoid such a frequency, the number of times the discharging switch S ₂ is turned on is divided into several times with respect to the charging switch S _{1 being} turned on once by the trigger pulse g ₁ shown in FIG. And the trigger pulse g as shown in FIG.
₂ is generated several times during the non-generation period of the trigger pulse g ₁ ,
The discharge by the discharge switch S ₂ is divided into several times, it is possible on the gel the lighting frequency. Of course, the capacitor C ₀
It is also possible to avoid the audible frequency by charging the battery, that is, by turning on and off the charging switch S ₁ several times and turning on and off the discharging switch S ₂ once. Also it once charged Kon'ndensa C _0, the number of times of divided charging, once the discharge of the capacitor C _0, also to avoid the undesirable frequency in combination with the large number of divided discharge. Needless to say, it is possible to easily avoid an inconvenient frequency by using the circuit shown in FIG.

[Procedure Amendment 9]

[Document name to be amended] Statement

[Correction target item name] 0056

[Correction method] Change

[Correction content]

The booster circuit 20 has a DC power source DC and a switch.
S₃₁And capacitor C₁₁And switch S ₃₁Switch interlocked with
Chi S ₃₁ 'The series circuit is connected in parallel, and the switch S₃₁To
Through the switch S₃₂And capacitor C₁₂And switch S₃₂
Switch S that interlocks with₃₂’Series circuit to DC power supply DC
Connect in parallel and switch S above₃₁, S₃₂In series with
Touch S₃₃Connect these switches S₃₁~ S₃₃Series of
Capacitor C through the path₀Is connected to the DC power supply DC
It And switch S₃₁And capacitor C₁₁In the series circuit
Switch S in parallel₃₂, S₃₃Is linked with the ON operation of
Switch S₄₁And switch S₃₂And con
Densa C₁₂In the series circuit of switch S₃₃Sui that works with
Touch S₃₃’Are connected in parallel.

[Procedure Amendment 10]

[Document name to be amended] Statement

[Correction target item name] 0059

[Correction method] Change

[Correction content]

The voltage Vc ₀ of the capacitor C ₀ shown in FIG. 10 (h) is Vc ₀ = 2 ^{n -1} · V _DC . (Where n is the number of capacitors) off the and switches S _33, S ₃₃ 'and S _41, when the discharge switch S ₂ is turned on as shown in FIG. 10 (e), the light source charges the capacitor C ₀ is After being discharged to L, the lamp current I _L flows as shown in FIG. 10 (i), and the light source L is turned on.

[Procedure Amendment 11]

[Document name to be amended] Statement

[Correction target item name] 0061

[Correction method] Change

[Correction content]

The capacitor C ₀ of the lighting circuit A is omitted,
Of course, it is possible to give the functions to the capacitors C ₁₁ and C ₁₂ . In this case, it is desirable that the capacitance relationship be C ₁₁ > C ₁₂ . In addition, in the circuit of the fourth embodiment, when high voltage is required at the time of starting the light source L, all the boosting operations of the boosting circuit 20 are performed, and when the output voltage may be lower than that after lighting, a switch is used. When S ₃₂ is fixed to ON and switch S ₃₂ 'is fixed to OFF, the voltage V _{DC of} DC power supply _DC
With the voltage twice as high as that of the light source L, the lighting state of the light source L can be maintained, the circuit efficiency can be improved, and the capacity of the capacitor C ₁₂ can be small.

[Procedure Amendment 12]

[Document name to be amended] Statement

[Name of item to be corrected] 0072

[Correction method] Change

[Correction content]

[0072] it can be further controlled in a wide lamp current I _L in the range to further even by the combining variable frequency even when the frequency constant. (Embodiment 8) FIG. 17 shows a circuit configuration of the eighth embodiment. In this embodiment,
For example, with use of the lighting circuit A having the same circuit configuration as in Example 1, which the other direct-current power supply DC ₀ to DC power source of the lighting circuit A are connected in series, the DC power source ₀
In this case, a power supply whose voltage V _DC0 is lower than a critical voltage at which the lamp current continues to increase and the battery runs out of control when the light source L is a discharge lamp is used. In Thus to the eighth embodiment circuit, by applying a bias dc voltage V _DC0 in series to the lighting circuit A, the lamp voltage V _L in the charging switch S ₁ is turned off in the lighting circuit A, the discharge switch S ₂ Is on and when charging switch S ₁ is on and switch ₀₁
Is off, the voltage V _DC0 and the sum voltage of the voltage V _DC of the DC power supply DC and the voltage V _DC0 of the DC power supply DC ₀ are increased or _decreased as shown in FIG. 18 (a). Lamp current I
_{Even if} the output voltage of the lighting circuit A becomes 0 due to the discharge of the capacitor C _0, the light source L is in the active state for a short time at that moment, so the voltage V _{DC0 that} is somewhat lower than the critical voltage of the light source L.
As a result, the lamp current I _L continues to flow while decreasing somewhat as shown by the dotted line in FIG. The current in the dotted line does not increase because the voltage V _DC0 is below the critical voltage. Therefore, the lamp current I _L due to the next discharge flows to the light source L within a short time when the slight current on the dotted line reaches 0, so that the lamp current I _L has no rest period, and the instantaneous current of the ions in the light source L changes. There is no disappearance, and the circuit operation can be made smooth.

[Procedure Amendment 13]

[Document name to be amended] Statement

[Correction target item name] 0074

[Correction method] Change

[Correction content]

In this embodiment, the capacitor C of the lighting circuit A is
_{Since the} lamp current I _L flows by the DC power supply DC ₀₁ between the _zero discharge and the next discharge, there is no pause period of the lamp current I _L , and the light output from the light source L becomes smooth and at the same time as in the case of FIG. As described above, the lighting circuit A can be reduced in size, weight, and loss, but in addition to this, there is an advantage that a low withstand voltage component can be used for the charging switch S ₁ and the discharging switch S ₂ .

[Procedure Amendment 14]

[Document name to be amended] Statement

[Correction target item name] 0084

[Correction method] Change

[Correction content]

(Thirteenth Embodiment) FIG. 26 shows the circuit configuration of the thirteenth embodiment. In this embodiment circuit, a polarity reversal circuit B including switches S _{A to} S _D connected in a bridge connection to the DC power source DC side is connected. Therefore, in the case of the thirteenth embodiment, the capacitor C ₀ needs to be a bidirectional alternating current. Example 13
Also in this case, the charging switch S ₁ can of course be used as the switches S _{A to} S _D. Since each operation is as described above, the description is omitted.

[Procedure Amendment 15]

[Document name to be amended] Statement

[Correction target item name] 0085

[Correction method] Change

[Correction content]

(Embodiment 14) FIG. 27 shows a circuit of this embodiment 14, in which the DC power supply DC is
A series circuit of a plurality of sets of charging switch S ₁₁ ... and the capacitor C ₀₁ ... and connected in parallel to the capacitor C ₀₁ ... each via a separate discharge switch S ₂₁ ... each input of the polarity inverting circuit B The charging switch S for each charging
₁₁ ..., the discharge switch S ₂₁ ... And the switches S _{A to} S _D are controlled by a trigger pulse generator (not shown), and the light source L
It is designed to pass an alternating current to.

[Procedure 16]

[Document name to be amended] Statement

[Correction target item name] 0086

[Correction method] Change

[Correction content]

FIG. 28 shows a charging switch S ₁₁ ..., A discharging switch S ₂₁ ... And switches S _{A to} S _{D of the} circuit of the fourteenth embodiment.
Shows a control example, on-off as shown in FIG. 28 (a) ~ (c) the switch S ₁₁ ... sequentially cyclically is charging, the discharge switch S ₂₁ ... switch S ₁₁ ... off for charging Figure 28, cyclically and sequentially in synchronization with the operation
The switches S _A and S _D and the switches S _B and S _{C of} the polarity reversing circuit B are turned on and off as shown in FIGS.
As shown in (g) and (h), the discharge switches S ₂₁ are alternately turned on and off every cycle of the on / off operation. As a result, the electric charge of the capacitor C ₀₁ ... Is sequentially discharged to the light source L, and the current I _{L in} the direction according to the on / off operation of the switches S _A and S _D and the switches S _B and S _C of the polarity inversion circuit B is generated. It flows as shown in FIG. 28 (i).

[Procedure Amendment 17]

[Document name to be amended] Statement

[Correction target item name] 0089

[Correction method] Change

[Correction content]

Further, since the switches S _A of the polarity reversing circuit B can also serve as the charging switch or the discharging switch, the number of switches can be suppressed to some extent. Further, it is also possible to use an alternating current capacitor as the charging / discharging capacitor C ₀₁ ..., Which makes it possible to use a capacitor having a long life or a capacitor having little high frequency loss. Further, by combining the switch S _A of the polarity reversing circuit B with a charging switch and a discharging switch, it becomes easy to perform extremely fine control, and the frequency of the current I _L flowing through the light source L can be arbitrarily multiplied or decreased. For the light source L where isoacoustic resonance is likely to occur, it is possible to realize the lighting circuit A which avoids the frequency at which acoustic resonance occurs. Moreover, it is possible to prevent noise interference due to avoiding frequencies of other electronic devices.

[Procedure 18]

[Document name to be amended] Statement

[Correction target item name] 0090

[Correction method] Change

[Correction content]

(Embodiment 15) FIG. 30 shows a circuit configuration of the embodiment 15, which is for turning on a preheating type light source L such as a fluorescent lamp as in the embodiment circuit of FIG. In the basic circuit, the circuit of the lighting circuit A is basically the same as the circuit of the embodiment shown in FIG. 1 and performs the same operation. Thus, at the time of starting the light source L, the threshold of the constant voltage connected via the impedance element Z between the non-power source side ends of the filaments f ₁ and f ₂ is set.
Turn on the semiconductor starting switch G, and turn on the filament f.
By discharging the electric charge of the capacitor C ₀ to ₁ and f ₂ and flowing a preheating current and turning off the switch G, the voltage of the capacitor C ₀ is applied to the light source L to start and light the light source L.

[Procedure Amendment 19]

[Document name to be amended] Statement

[Correction target item name] 0091

[Correction method] Change

[Correction content]

The operation during steady lighting is similar to that of the circuit of FIG. (Embodiment 16) FIG. 31 shows the circuit configuration of the present embodiment 16. In this embodiment circuit, one end of the capacitor C ₀ is connected to the DC power supply DC via the filament f on one side of the light source L. Therefore, in this embodiment, the filament f
The preheating, rather than discharging of the capacitor C _0, as in the above Example 15, to obtain rows that have <br/> using the charging current of the capacitor C _0.

[Procedure amendment 20]

[Document name to be amended] Statement

[Correction target item name] 0092

[Correction method] Change

[Correction content]

[0092] (Embodiment 17) FIG. 32 shows a circuit configuration of the embodiment 1 7, this embodiment circuit, the lighting circuit corresponding to the embodiment circuit of Figure 3 using a plurality of capacitors C ₀₁ ... A is used, and the preheating of the filament f of the light source L is
As in the sixteenth embodiment, the charging current of the capacitor C ₀₁ ... Is used.

[Procedure correction 21]

[Document name to be amended] Statement

[Correction target item name] 0098

[Correction method] Change

[Correction content]

Next, the switch S₀₁Is on, switch S
₀₂When the switch turns off, the DC power source DC switches S ₀₁ Through
Condenser C₀₁Current flows to the capacitor C₀₁Is again
Charged and at the same time capacitor C₀₂Is the charge of capacitor C
₀₂, Light source L, discharge switch S ₀₁ , Capacitor C₀₂The times
Discharged on the road. That is, switch S₀₁Is the capacitor C ₀₁
The charging switch of the₀₂Discharge of
Configure a switch for the.

[Procedure correction 22]

[Document name to be amended] Statement

[Correction target item name] 0105

[Correction method] Change

[Correction content]

(Embodiment 21) FIG. 40 shows a circuit of this embodiment 21, which uses a step-down circuit 21 "different from that of the 20th embodiment. , The charging switch S ₁ and the serial connection switch Ss ₁ in the step-down circuit 21 ″ are turned on and the parallel connection switch Sp ₁ is turned off, so that the charging switch S _{1 is} switched from the DC power supply DC. , Capacitor C ₂₁ , switch S
s ₁ , capacitor C ₂₂ , switch Ss ₂ , capacitor C ₂₃
An electric current flows through the circuit to charge the capacitors C ₂₁ ...

[Procedure amendment 23]

[Document name to be amended] Statement

[Correction target item name] 0106

[Correction method] Change

[Correction content]

That is, each capacitor C ₂₁ ...
Is charged to 1/3 of the voltage V _DC . Next, the series connection switch
Switch Ss _1, ..., Switch S ₁ for charging is turned off, Switch Sp ₁ for parallel connection is turned on, and switch S ₂ for discharging is further turned on.
When the switch is turned on, a voltage ⅓ of the voltage V _DC of the DC power supply DC is output from the step-down circuit 21 ″, applied to the light source L, and the light source L is turned on.

[Procedure amendment 24]

[Document name to be amended] Statement

[Name of item to be corrected] 0109

[Correction method] Change

[Correction content]

That is, when operating as a booster circuit,
First, turn on the charging switch S ₁ and the parallel connection switch S _1.
p ₁ ... Is turned on, series connection switch Ss ₁ ... and Discharge switch S ₂ are turned off. That is, the capacitors C ₁₁ ... Are connected in parallel and are connected to the DC power supply DC, and each is charged to the voltage V _{DC of the} DC power supply DC.

[Procedure Amendment 25]

[Document name to be amended] Statement

[Correction target item name] 0110

[Correction method] Change

[Correction content]

Next, when the charging switch S ₁ , the parallel connection switch Sp ₁ ... Are turned off, and the series connection switch Ss ₁ ... And the discharge switch S ₂ are turned on, the three capacitors C ₁₁
Are connected in series and a voltage three times the voltage V _DC of the DC power supply DC is applied to the light source L, and the light source L is turned on. In the case of step-down, first the charging switch S ₁ and the series connection switch S
When s ₁ ... Is turned on and the remaining switches are turned off, the capacitors C ₁₁ ... Are connected in series and charged. Next, when the charging switch S ₁ , the series connection switch Ss ₁ ... Are turned off, and the parallel connection switch Sp ₁ ... And the discharge switch S ₂ are turned on, 1/3 of the voltage V _DC of the DC power supply DC becomes the light source L. And the light source L is turned on.

[Procedure Amendment 26]

[Document name to be amended] Statement

[Correction target item name] 0111

[Correction method] Change

[Correction content]

As described above, in the twenty-third embodiment, the step-up / down circuit 30 can be switched according to the high-voltage load and the low-voltage light source by operating the switch group, and the required voltage can be output to the light source L in a wide range. There are advantages. By the way, instead of the charging switch S ₁ of the embodiment circuits of FIGS. 40, 41 and 42, a parallel connection switch Sp ₁ ... Or a series connection switch Ss ₁ ... Instead of S _2, a switch for parallel connection S
It is also possible to use p ₁ ... And the switch Ss ₁ for series connection.

[Procedure Amendment 27]

[Document name to be amended] Statement

[Name of item to be corrected] 0113

[Correction method] Change

[Correction content]

(Embodiment 25) FIG. 44 shows a circuit of this embodiment 25.
The circuit of this embodiment is shown in FIG.6Illumination of the example
The circuit uses three lights, and the polarity inversion circuit B is shared.
There is. Each lighting circuitOf ACharging switch S₁₁~ S₁₃, Discharge
Switch S_{twenty one}~ S_{twenty three}, Capacitor C₀₁~ S ₀₃, Light source L
₁~ L₃By increasing the number of lights, you can easily increase the number of lights
Both light sources L₁To make the current flowing through ... an alternating current
You can

[Procedure correction 28]

[Document name to be amended] Statement

[Correction target item name] 0114

[Correction method] Change

[Correction content]

The switches S _{A to} S _D in the polarity inverting circuit B are
It is also possible to serve charged Yosu switch S ₁₁ ... and.
After this time discharging of the capacitor C of each _01, C _02, C ₀₃ is completed, it is desirable to turn on switch S ₁₁ ... the charging. (Example 26) FIG. 45 shows the circuit of this embodiment 26, the embodiment circuit which was provided corresponding to the polarity inverting circuit B ₁ ... to each of the light sources L ₁ ..., each light source L ₁ Each polarity reversing circuit B ₁ ... also serves as a switch for discharging the corresponding capacitor C ₀₁ .

[Procedure correction 29]

[Document name to be amended] Statement

[Name of item to be corrected] 0117

[Correction method] Change

[Correction content]

(Embodiment 28) FIG. 49 shows a circuit of this embodiment. This embodiment circuit operates by rectifying and smoothing a commercial power supply AC by a rectifying and smoothing circuit 50 to obtain a DC power supply. The lighting circuit A uses a composite light source LL that combines a light source LR that emits red light, a light source LG that emits green light, and a light source LB that emits blue light, and the lighting circuit A shown in FIG. 3 corresponding to each of the light sources LR to LB. The individual lighting circuits AR to AB having the same configuration as the above are provided, and the charging switch SR of each individual lighting circuit AR to AB is provided.
₁₁ ... to SB ₁₁ ... , the switching cycle of the discharge switches SR ₂₁ ... to SB ₂₁ ..., the capacity of the capacitors CR ₁ ... to CB ₁ ... are set to individually increase and decrease the light sources LR to LB. The light emission color of the composite light source LL is arbitrarily changed, and each light source L
It is possible to increase or decrease light with the emission ratio of R to LB being arbitrarily fixed, that is, to increase or decrease light in the same emission color. Performed by a pulse generator (not shown) when changing charge switch SR ₁₁ ... ~SB ₁₁ ..., the discharge switch SR ₂₁ ... ~SB ₂₁ ... switching period of. The filaments f of the light sources LR to LG are inserted into the charging paths of the capacitors CR _{1 to} CB ₁ of the corresponding individual lighting circuits AR to AB to be preheated by the charging current.

[Procedure amendment 30]

[Document name to be amended] Statement

[Correction target item name] 0129

[Correction method] Change

[Correction content]

The invention described in claim 18 can obtain the same effect as that of claim 16. According to a nineteenth aspect of the present invention, the switching means for series connection and the switching means for parallel connection are constituted by diodes, and when the charging switch is turned on, the capacitors of the series connection switch means are connected in series to charge the capacitors. Since the direction is set and the direction of the diode of the switch device for parallel connection is set in the direction in which each capacitor is discharged in parallel to the light source when the discharge switch is turned on, it is cheaper than when using a switch, and the control signal The circuit configuration is simpler than that of a switch that requires .

[Procedure 31]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 25

[Correction method] Change

[Correction content]

FIG. 25

[Procedure correction 32]

[Document name to be corrected] Drawing

[Correction target item name] Fig. 36

[Correction method] Change

[Correction content]

FIG. 36

[Procedure amendment 34]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 44

[Correction method] Change

[Correction content]

FIG. 42

FIG. 44

[Procedure amendment 35]

[Document name to be corrected] Drawing

[Correction target item name] Fig. 54

[Correction method] Change

[Correction content]

FIG. 54

[Procedure amendment]

[Submission date] February 22, 1993

[Procedure amendment 33]

[Document name to be corrected] Drawing

[Correction target item name] Fig. 42

[Correction method] Change

[Correction content]

FIG. 42

[Procedure amendment 34]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 44

[Correction method] Change

[Correction content]

FIG. 44

Claims (38)

[Claims] 1. A series circuit of a charging switch and a capacitor is connected in parallel with a DC power source having a voltage higher than a lighting voltage of a light source, and a series circuit of a discharging switch and a light source is connected in parallel with the capacitor for lighting. The circuit is configured to charge and discharge the capacitor by alternately turning on and off the charging switch and the discharging switch, lighting the light source by the discharging current from the capacitor, and setting the lighting frequency of the light source to the critical fusion frequency or higher. A light source lighting device characterized by the above. 2. The capacity of the capacitor, the voltage of the DC power supply, the ON period of the charging switch, the OFF period of the discharging switch, and the charging / discharging repetition frequency are set so that the discharging current of the capacitor becomes approximately the rated current of the light source. The light source lighting device according to claim 1, wherein: 3. The light source lighting device according to claim 1, wherein the lighting circuit is configured by using a plurality of sets of a charging switch, a discharging switch and a capacitor. 4. A charge switch and a discharge switch are turned on,
4. The light source lighting device according to claim 3, wherein the off periods are sequentially shifted for each set. 5. The on period of each of the discharge switches of each set is set such that the discharge currents flowing through the light source when the discharge switches are turned on partially overlap between adjacent sets. Light source lighting device. 6. The light source lighting device according to claim 3, wherein each charging switch and capacitor are connected to a plurality of DC power supplies having different voltages. 7. The light source lighting device according to claim 3, wherein the luminous flux of the light source is changed by controlling the discharge period of each set of capacitors. 8. A series circuit of a discharge switch, a starting switch, an impedance, and another filament of the light source is connected in parallel to the capacitor through one filament of the preheating type light source. Light source lighting device. 9. The light source lighting device according to claim 8, wherein a semiconductor switch having a constant voltage threshold value is used as the starting switch. 10. The charging frequency of the light source is increased by charging and discharging the capacitor by turning on the discharging switch a plurality of times with respect to turning on the charging switch once. 1. The light source lighting device according to 1. 11. The charging frequency of the light source is gradually reduced by turning on the discharging switch once for a plurality of times of turning on the charging switch to gradually reduce the lighting frequency of the light source. Light source lighting device. [Claim 12] A low voltage DC power supply having a voltage lower than a lighting voltage of a light source is connected through a charging switch, a plurality of capacitors are charged in parallel with the low voltage DC power supply when the charging switch is turned on, and a discharge switch is turned on. 2. The light source lighting device according to claim 1, further comprising a booster circuit which sometimes connects a plurality of capacitors in series to obtain a DC power supply voltage higher than a lighting voltage of the light source. 13. The light source lighting device according to claim 12, wherein the capacitor group of the booster circuit is composed of capacitors having the same capacity. 14. The light source lighting device according to claim 13, wherein the booster circuit has a high boosting ratio when the light source is started and a low boosting ratio that is a voltage close to the lighting voltage of the light source during steady lighting. .. 15. The light source lighting device according to claim 14, wherein the capacity of the capacitor of the booster circuit used only for boosting for starting is made smaller than the capacity of the capacitor used for steady lighting. 16. A high-voltage DC power supply connected to a high-voltage DC power supply via a charging switch, wherein a plurality of capacitors are serially charged when the charging switch is turned on, and a plurality of capacitors are connected in parallel when a discharging switch is turned on. 2. The light source lighting device according to claim 1, further comprising a step-down circuit for obtaining a DC power supply voltage corresponding to a light source having a low lighting voltage from the voltage. 17. The light source lighting device according to claim 16, wherein the capacitor group of the step-down circuit is composed of capacitors having the same capacity. 18. A switch means for series connection for connecting a plurality of capacitors in series to a high-voltage DC power supply, and a switch means for parallel connection for connecting the plurality of capacitors in parallel to connect the parallel circuit to a light source in parallel. And a step-down circuit that charges a plurality of capacitors in series with a high-voltage DC power source and alternately turns on and off both switch means so that the plurality of capacitors are connected in parallel when discharged to the light source. The light source lighting device according to claim 16. 19. The series connection switch means and the parallel connection switch means are composed of diodes, and the direction of the diode of the series connection switch means is set so that the capacitors are connected in series and charged when the charging switch is turned on. 19. The light source lighting device according to claim 18, wherein the direction of the diode of the switch means for parallel connection is set so that each capacitor is discharged in parallel to the light source when the discharge switch is turned on. 20. A step-up / down circuit including a capacitor group and a switch group capable of switching and setting a booster circuit for parallel charging and series discharging of the capacitor group and a step-down circuit for serially charging and parallel discharging of the capacitor group, and a switch for charging are provided as a charging switch. The light source lighting device according to claim 1, wherein the light source lighting device is connected to a DC power source through the light source lighting device. 21. A lamp current of a light source is detected, and switching of a charging switch and a discharging switch is controlled according to the detected lamp current to increase / decrease a current flowing through the light source to control a luminous flux. The light source lighting device according to claim 1. 22. The light source lighting device according to claim 1, wherein a DC voltage lower than a lighting voltage of the light source is applied to the light source as a bias voltage. 23. The light source lighting device according to claim 22, wherein a voltage from another DC power source is applied to the light source as a bias voltage. 24. The light source lighting device according to claim 1 or 3, wherein a polarity reversing circuit including a switch group bridge-connected is interposed between the light source and the lighting circuit. 25. The light source lighting device according to claim 24, wherein a switch in the switch group of the polarity reversing circuit is also used as a discharging switch of the lighting circuit. 26. The light source lighting device according to claim 1, wherein a polarity reversing circuit including a bridge-connected switch group is interposed between the DC power supply and the lighting circuit. 27. The light source lighting device according to claim 26, wherein a switch in the switch group of the polarity reversing circuit is also used as a charging switch of the lighting circuit. 28. The filament, which is connected in series with a capacitor, a charging switch, and a filament on one side of a light source, is preheated by a charging current of the capacitor. Light source lighting device. 29. A light source lighting device, wherein two sets of the lighting circuits according to claim 1 are used, and outputs of the respective lighting circuits are alternately connected to a light source. 30. A circuit in which a series circuit of a first charging / discharging switch and a first capacitor and a series circuit of a second charging / discharging switch and a second capacitor are connected in parallel is connected in parallel to a DC power supply. Then, a light source is connected between the connection point between the first charging / discharging switch and the first capacitor and the connection point between the second charging / discharging switch and the second capacitor to discharge the first capacitor. Includes a first charging / discharging switch and a light source, and a lighting circuit for supplying a current to the light source via the first switch and the light source when the second capacitor is discharged. .. 31. One filament of a preheating type light source is connected between the first charging / discharging switch and the first capacitor, and the other filament of the light source is connected to the second charging / discharging switch and the second filament. 31. The light source lighting device according to claim 30, wherein a filament preheating circuit is formed by being connected to a capacitor. 32. A light source lighting device, wherein the lighting circuit according to claim 1 is connected to a plurality of DC power supplies, and each lighting circuit individually lights a light source. 33. The light source lighting device according to claim 32, wherein the respective lighting circuits are connected in parallel to the DC power source via a common polarity reversing circuit composed of a bridge-connected switch group. 34. The light source lighting device according to claim 32, wherein a polarity reversing circuit including a switch group bridge-connected between each lighting circuit and each light source is separately connected. 35. The light source lighting device according to claim 1, wherein a plurality of series circuits of a discharge switch and a light source are connected in parallel. 36. The light source lighting device according to claim 32 or 35, further comprising means for changing the emission color of each light source to increase or decrease the luminous flux of each light source. 37. The light source lighting device according to claim 36, wherein one variable color lamp provided with a plurality of anodes instead of each light source is used. 38. The light source lighting device according to claim 37, wherein a charging current of a capacitor is supplied to a common cathode of the variable color lamp to preheat it.