JP2000286086A - Discharge lamp lighting system, discharge lamp device and lighting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize a discharge lamp lighting system by comprising a an inverter circuit having a switching element and lighting a high pressure discharge lamp below a predetermined power consumption, and a resonance circuit capable of saturating an inductor provided with a capacitor in the starting for connecting the glow discharge starting voltage and an arc discharge maintenance point with a continuous load curve. SOLUTION: A driving circuit 24 and a resonance circuit 26 are connected to an inverter circuit 23 connected with a commercial AC power source 3 through a filter circuit 21 and a full-wave rectification circuit 22. The temperature rise of the resonance circuit 24 relating to the generation of a pulse starting voltage is small even when a ballast chock L4 of an inductor provided with the condensers C5, C6 for DC cut and resonance is minimized. The starting voltage of a glow discharge starting voltage capable of starting the high pressure discharge lamp 11 of below 35 W of consumption voltage free from the countermeasure for high frequency, and the arc discharge maintenance voltage point is increased by the saturation of the ballast chock L4, which dispenses with an igniter, and one continuous load curve is formed thereby.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discharge lamp lighting device, a discharge lamp device, and a lighting device for lighting a high-pressure discharge lamp having a power consumption of 35 W or less.

[0002]

2. Description of the Related Art In recent years, a relatively efficient high-pressure discharge lamp has been used, and a discharge lamp lighting device for the high-pressure discharge lamp is becoming widespread.

On the other hand, small high-pressure discharge lamps with low power consumption have recently become widespread, but it is difficult to reduce the size of the high-pressure discharge lamp because an igniter circuit or the like for supplying a starting voltage is required to light the high-pressure discharge lamp.

[0004]

As described above, the conventional discharge lamp lighting device for lighting a high-pressure discharge lamp has a problem that it is difficult to sufficiently reduce the size.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a discharge lamp lighting device, a discharge lamp device, and an illuminating device for lighting a high-pressure discharge lamp with a power consumption of 35 W or less, which enables miniaturization. Aim.

[0006]

According to a first aspect of the present invention, there is provided a discharge lamp lighting device comprising: an inverter circuit having a switching element for lighting a high pressure discharge lamp having a power consumption of 35 W or less; and an inductor and a capacitor. And a resonance circuit in which the glow discharge starting voltage of the high-pressure discharge lamp and the arc discharge maintenance voltage point are connected by a continuous load curve. The discharge starting voltage and the arc discharge maintaining voltage point are connected by a continuous load curve, and a high-pressure discharge lamp of 35 W or less does not require measures against harmonics and has a low starting voltage. For example, a high-voltage pulse generating circuit such as an igniter becomes unnecessary, and the circuit can be downsized.

According to a second aspect of the present invention, there is provided a discharge lamp lighting device according to the first aspect, wherein the inverter circuit comprises:
It has a no-load protection function.When the high-pressure discharge lamp restarts at high temperature, the high-pressure discharge lamp becomes inconsistent.If the starting voltage is continuously generated, the resonance inductor of the resonance circuit is saturated. As the resonance frequency increases and the resonance current increases, an excessive current flows through the resonance inductor, and this current also flows through the switching element, so that conduction loss increases, switching loss increases, and heat is generated. , The inductor of the resonance circuit generates heat,
Since a large stress is applied to the inverter circuit as in the case of the early phase oscillation and the excessive current, this stress is prevented.

According to a third aspect of the present invention, there is provided a discharge lamp lighting device according to the second aspect, wherein the no-load protection function includes:
This is due to intermittent oscillation of the switching element of the inverter circuit, and is operated intermittently to prevent stress applied to the switching element and the like.

According to a fourth aspect of the present invention, there is provided the discharge lamp lighting device according to any one of the first to third aspects, wherein the glow discharge detecting means for detecting a glow discharge, and the glow discharge start is started by the glow discharge detecting means. After the detection, the output voltage is reduced to a level at which glow discharge can be maintained, and output control means for increasing the output voltage over a certain period of time from the reduced output voltage and causing transition to arc discharge is provided. After the glow discharge detection means detects the start of glow discharge, the entire electrode can be uniformly heated by suppressing the voltage by the output control means and gradually heating the electrodes of the high-pressure discharge lamp. The amount of sputtering of the electrode with the lower electrode temperature is suppressed, and the amount of evaporation of the constituent material of the electrode with the higher electrode temperature is suppressed to suppress blackening.

According to a fifth aspect of the present invention, there is provided the discharge lamp lighting device according to any one of the first to third aspects, wherein a glow discharge detecting means for detecting a glow discharge, and the glow discharge start is started by the glow discharge detecting means. After the detection, the output voltage is reduced to a level at which the glow discharge can be maintained, and output control means for canceling the reduction after a certain period of time.After the glow discharge detection means detects the start of the glow discharge, By gradually heating the electrodes of the high-pressure discharge lamp while suppressing the voltage by the output control means, the entire electrodes can be uniformly heated. However, since the amount of evaporation of the electrode constituent material of the electrode having a higher electrode temperature is suppressed to suppress blackening, and the transition time to arc discharge becomes constant, for example, a plurality of Suppress the variation in starting lighting when using simultaneously.

According to a sixth aspect of the present invention, there is provided a discharge lamp lighting device according to the fourth or fifth aspect, wherein the output control means changes the output voltage by changing the operating frequency of the inverter circuit. In addition, the voltage of the inverter circuit can be adjusted.

According to a seventh aspect of the present invention, there is provided the discharge lamp lighting device according to any one of the first to sixth aspects, wherein the inverter circuit controls the lamp power to be constant. The inverter circuit is protected because the color difference of the discharge lamp is suppressed and the power is not excessively increased even when the lamp voltage increases at the end of the lamp life.

The discharge lamp lighting device according to claim 8 is the discharge lamp lighting device according to claim 7, further comprising an auxiliary resonance circuit having an inductor and a capacitor for controlling resonance of the resonance circuit. The control is performed by the saturation of the inductor of the auxiliary resonance circuit. Since the inductor can be saturated even with a small current, the lamp power is easily controlled.

A discharge lamp lighting device according to a ninth aspect of the present invention is the discharge lamp lighting device according to the seventh aspect, further comprising a smoothing means for smoothing an input voltage to the inverter circuit. It is controlled by the smoothing amount.

A discharge lamp lighting device according to a tenth aspect is the discharge lamp lighting device according to any one of the first to ninth aspects,
Control means comprising temperature detecting means for detecting the temperature of the inverter circuit, wherein the output of the inverter circuit is lowered when the temperature detected by the temperature detecting means is high, and the output of the inverter circuit is raised when the temperature is low. And reduces stress applied to components such as switching elements when the temperature of the inverter circuit is high.

According to an eleventh aspect of the present invention, in the discharge lamp lighting device according to any one of the first to tenth aspects, the temperature detecting means is disposed near an inductor of the resonance circuit. The temperature of the inductor used for resonance can be reliably detected, and adjustment of, for example, a no-load secondary voltage related to the saturation level of the inductor for resonance is also possible.

A discharge lamp lighting device according to a twelfth aspect of the present invention is the discharge lamp lighting device according to the eleventh aspect, further comprising a substrate for mounting an inductor of the resonance circuit on a surface opposite to a surface on which the discharge lamp is located. Thus, the temperature of the inductor of the resonance circuit can be detected without being affected by the heat of the discharge lamp.

A discharge lamp device according to a thirteenth aspect includes the discharge lamp lighting device according to any one of the first to twelfth aspects; a base housing the discharge lamp lighting device; and a discharge lamp attached to the base. And exert their respective effects.

A lighting device according to a fourteenth aspect includes the discharge lamp lighting device according to any one of the first to twelfth aspects; and an appliance body in which the discharge lamp is mounted on the discharge lamp lighting device. It works.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a fluorescent lamp device according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 2 is a sectional view showing a discharge lamp device, and FIG.
Is a plan view showing the front surface of the circuit board, and FIG. 4 is a bottom view showing the back surface of the circuit board.

As shown in FIG. 2, the discharge lamp device 1 comprises:
It has a cylindrical substrate 2 of a heat-resistant substance such as a heat-resistant synthetic resin,
A base mounting portion 3 is formed on an upper portion of the base 2, a base 4 is mounted on the base mounting portion 3, a first wiring board 5 is mounted on a lower portion of the base 2, and a base on an upper portion of the base 2. A second wiring board 6 is mounted in the mounting section 3. A reflector 8 having an irradiation opening 7 on the lower surface is attached to the lower portion of the base 2, and in this reflector 8, a circular hole 12 shown in FIG.
And a short arc type high intensity discharge lamp 11 having an electrode formed of a constituent material such as tungsten having a power consumption of 35 W or less, for example, 25 W attached to the first wiring substrate 5. Have been. The reason why the power consumption is set to 35 W or less is that when the power consumption exceeds 35 W, it is necessary to take measures against harmonics.

The first wiring board 5 and the second wiring board 6 may be replaced with only one first wiring board 5 shown in FIGS. 3 and 4. In this case, a cooling air vent circular hole 12 is not formed in the center of the first wiring board 5, and a reflection surface 13 is formed on the side where the high-pressure discharge lamp 11 is mounted. Then, the discharge lamp lighting device 14 is mounted on the first wiring board 5 or the first and second wiring boards 5 and 6.

FIG. 1 is a circuit diagram showing a discharge lamp lighting device. The discharge lamp lighting device 14 shown in FIG. 1 includes a filter circuit 21 having a commercial AC power supply e and having a capacitor C1 and an inductor L1.
Are connected, and diodes D1, D2,
An input terminal of the full-wave rectifier circuit 22 in which D3 and D4 are connected in a bridge shape is connected.
The smoothing capacitor C2 is connected. When the second wiring board 6 is used, the capacitor C2 is furthest from the high-pressure discharge lamp 11 and has the lowest temperature.
By arranging on the wiring board 6, adverse effects due to temperature can be prevented. On the other hand, when only the first wiring board 5 is used, the capacitor C2 is placed near the outer periphery of the first wiring board 5 because the capacitor C2 is tall.

The capacitor C2 has a 40 k as a complementary repair type half bridge type lighting means.
An inverter circuit 23 operating at a frequency of from Hz to 150 kHz is connected. The inverter circuit 23 includes an N-type field effect transistor Q1 as a switching element.
And a P-type field effect transistor Q2 are connected in series, and between the gate and the source of the field effect transistor Q1,
The drive circuit 24 is connected. The drive circuit 24 includes a Zener diode ZD1 for constant voltage and a Zener diode ZD.
2 is connected to the series circuit of the capacitor C3, the inductor L2 and the inductor L3, and the capacitor is connected in parallel with the series circuit of the inductor L2 and the inductor L3.
C4 is connected, and the auxiliary resonance circuit 25 is connected. Further, the gates of the field effect transistor Q1 and the field effect transistor Q2 are connected to the inductor L1 via the resistor R1. The inverter circuit 23 is connected to the second wiring board 6
Is used, it is disposed on the first wiring board 5 near the high-pressure discharge lamp 11 in order to eliminate high-frequency attenuation. That is, if DC-related components are provided on the second wiring board 6 and the high-frequency portion is provided on the first wiring board 5, it is excellent in terms of temperature, pulse attenuation and noise countermeasures. On the other hand, when only the first wiring board 5 is used, a space can be used efficiently by arranging short components around the center and arranging tall components around the center.

Further, a ballast choke L4, which is an inductor magnetically connected to the inductor L2 by a transformer configuration, a DC cut capacitor C5, and a resonance capacitor C6 are connected to the field effect transistor Q2. To form a resonance circuit 26 serving as a main circuit, and the high-pressure discharge lamp 11 is connected in parallel to the capacitor C6.

A field effect transistor Q3 is connected in parallel with the Zener diode ZD2, and a series circuit of a resistor R2 and a resistor R3 is connected in parallel with the ballast choke L4 and the capacitor C5. The connection point of resistor R3 is diode D5 and Zener diode
The gate of the field effect transistor Q3 is connected via ZD3, and a capacitor C7 is connected between the gate and the source of the field effect transistor Q3.

Next, the operation of the above embodiment will be described.

First, the voltage of the commercial AC power supply e is full-wave rectified by the full-wave rectifier circuit 22 and smoothed by the capacitor C2.

In addition, when a starting secondary voltage is generated in which the high-pressure discharge lamp 11 is not turned on, a starting voltage is generated. When the voltage of the high-pressure discharge lamp 11, that is, the lamp voltage increases, the ballast chokes L4 and L4 correspond to this voltage. Capacitor C5
, The voltage across the resistor R2 in the series circuit of the resistors R3 and R2 provided in parallel with the series circuit of the ballast choke L4 and the capacitor C5 increases. However, when the voltage becomes equal to or higher than the starting secondary voltage, the Zener diode ZD3 turns on to turn on the field effect transistor Q3, so that the gate terminal of the field effect transistor Q1 is short-circuited through the Zener diode ZD1, and the inverter circuit 23 stops oscillating. . After the oscillation stops, the voltage across the resistor R2 decreases, turning off the field effect transistor Q3. And if there is no starting voltage from the resistor R1,
The inverter circuit 23 maintains the oscillation stop. In this state,
When the voltage of the commercial AC power supply e rises, oscillation starts when the gate voltage is supplied to the field effect transistor Q1 by the AC voltage via the resistor R1. This is repeated to generate a pulse-like starting voltage at twice the frequency of the AC voltage.

Therefore, the ballast choke L4 is reduced for downsizing and the like, the resonance frequency of the resonance circuit 26 is increased, and the switching of the field effect transistor Q1 and the field effect transistor Q2 is advanced to increase the switching loss. Therefore, even if the temperature rises, the temperature rise can be sufficiently reduced by the action of the intermittent oscillation, and there is no risk of thermal runaway.

When the high-pressure discharge lamp 11 is restarted at a high temperature, the starting voltage becomes 20 kV or more at peak, toe, and peak, so that it is difficult to relight easily. Transistor Q1,
Although large stress is applied to Q2, the intermittent operation reduces the stress of the field effect transistors Q1 and Q2.

When the high-pressure discharge lamp 11 is started and turned on, the voltages of the resistors R2 and R3 are low, the Zener diode ZD3 is off, and the gate voltage of the field-effect transistor Q3 is low, so that the Zener diode ZD1 is turned off. The inverter circuit 23 operates without short-circuiting the gate terminal of the field-effect transistor Q1 through
3, turn on and off the field-effect transistor Q1 and the field-effect transistor Q2 at the resonance frequency of the inductor L2 and the inductor L3, respectively, so that the on and off are reversed.
The high-pressure discharge lamp 11 is turned on in accordance with the resonance output voltage of the resonance circuit 26 including the ballast choke L4 and the capacitors C5 and C6.

That is, at the operating frequency determined by the resonance frequency of the capacitor C3, the inductor L2 and the inductor L3,
Ballast choke L4, capacitor C5 and capacitor C6
When the inverter circuit 23 having the resonance circuit 26 is operated, as the load becomes closer to no load, the ballast choke L4 and the capacitor become closer.
The resonance frequency of C5 and capacitor C6 and capacitor C3,
Since the operating frequency of the inverter circuit 23 determined by the inductor L2 and the inductor L3 approaches, the load curve of the inverter circuit 23 continuously changes, and the glow discharge starting voltage at which the high pressure discharge lamp 11 starts is included from the arc discharge maintaining voltage point. At the time of starting, the lamp power and lamp voltage characteristics with respect to the lamp current as shown in FIG. 5 are obtained. Since the starting voltage can be increased by saturating the ballast choke L4, an igniter or the like is not required and a single continuous load curve is obtained.

The inverter circuit 23 has a frequency of 40 k.
Even when operated at Hz to 150 kHz, an acoustic resonance phenomenon can be avoided in a high-pressure discharge lamp of 35 W or less.

Next, a discharge lamp lighting device according to another embodiment will be described with reference to FIG.

FIG. 6 is a circuit diagram showing a discharge lamp lighting device according to another embodiment. The discharge lamp lighting device 14 according to the embodiment shown in FIG. 6 is different from the discharge lamp lighting device according to the embodiment shown in FIG. 14, a soft start circuit 31 is provided.

The soft start circuit 31 connects a glow discharge detection circuit 32 as a glow discharge detection means of a series circuit of the resistors R5 and R6 in parallel with the series circuit of the ballast choke L4 and the capacitor C5. A diode D7 and a capacitor C1 are connected in parallel with the resistor R6.
Connect the series circuit of resistor R7 and capacitor C12 in parallel with capacitor C11.
Connect the gate of field effect transistor Q4 to the connection point of R7 and capacitor C12, connect the parallel circuit of resistor R7 and capacitor C15 between the drain and source of field effect transistor Q4, and connect the zener diode ZD5.
Connect the gate of field effect transistor Q5. On the other hand, a series circuit of a diode D8 and a zener diode ZD6 is connected in parallel with the inductor L3, and the zener diode ZD
6, the drain of the field effect transistor Q5 in parallel with
An output control circuit 33 for connecting a source and serving as output control means
Is formed. The time constant of the resistor R5 and the capacitor C15 is set to about 0.1 second, and the time constant of the resistor R7 and the capacitor C12 is set to about 1 second.

The basic operation is the same as that of the embodiment shown in FIG. 1. However, as shown in FIG. 7, when the high-pressure discharge lamp 11 starts glow discharge at, for example, 400 V, the glow discharge detection circuit 32 The start of glow discharge is detected by detecting the voltage of the high-pressure discharge lamp 11 with the resistors R5 and R6,
That is, 0.1 is the time constant of the resistor R5 and the capacitor C15.
Seconds later, the field effect transistor Q5 turns on and the inductor L3
A DC current is supplied to the inductor to saturate the inductor L3 and increase the resonance frequency determined by the capacitor C3, the inductor L2, and the inductor L3. Then, in the output control circuit 33, the resistance R
The lamp voltage is reduced to about 200 V at which the glow discharge can be maintained during about one second when the field effect transistor Q4 is turned on by the time constant of the capacitor 7 and the capacitor C12. And
When the time set by the time constant of the resistor R7 and the capacitor C12 elapses and the field-effect transistor Q4 turns on, the field-effect transistor Q5 turns off. No longer saturates. At this time, the oscillating frequency of the inverter circuit 23 becomes low, generating a high output voltage and causing the high-pressure discharge lamp 11 to perform an arc transition.

As described above, by warming the electrodes by performing glow discharge at a low voltage for a relatively long time, the temperatures of the two electrodes can be uniformly increased, and not only the surfaces of the electrodes but also the inside of the electrodes can be heated. Because the entire electrode warms up uniformly, the spatter of the electrode with the lower electrode temperature can be suppressed in the early stage of arc discharge, and the evaporation of the electrode constituent materials such as tungsten on the electrode with the higher electrode temperature is suppressed, resulting in blackening. Can be prevented, and the luminous flux maintenance rate can be improved.

In the above-described embodiment, the voltage is increased after a predetermined time has elapsed from the glow discharge to shift to arc discharge. However, after the glow discharge has started, the voltage is gradually increased to shift to arc discharge. Alternatively, the start of the glow discharge may be detected by detecting a decrease in the lamp voltage or an increase in the lamp current.

A discharge lamp lighting device according to another embodiment will be described with reference to FIG.

FIG. 8 is a circuit diagram showing a discharge lamp lighting device according to another embodiment. The discharge lamp lighting device 14 according to the embodiment shown in FIG. 8 is different from the discharge lamp lighting device according to the embodiment shown in FIG. 14, a soft start circuit 34 is connected in place of the soft start circuit 31.

This soft start circuit 34 connects a glow discharge detection circuit 35 as a glow discharge detection means of a series circuit of a resistor R11 and a resistor R12 in parallel with the ballast choke L4 and the capacitor C5.
Diode D11 and Zener diode from connection point 2
Connected to the gate of field effect transistor Q6 via ZD7, which is connected to Zener diode ZD
8 and a diode D12 are connected between both terminals of the inductor L3.A parallel circuit of a capacitor C16 and a resistor R15 is connected between the gate and the source of the field effect transistor Q6, and an output control circuit as output control means is connected. 36
Is formed.

When the high-pressure discharge lamp 11 is not lit and the voltage is high, the voltage of the series circuit of the ballast choke L4 and the capacitor C5 is high, so that the Zener diode ZD7 turns on and the field-effect transistor Q6 turns on, zener diode ZD8 turns on, and inductor L3 saturates, so that the oscillation frequency changes high and the voltage drops. As shown in FIG. 9, the starting voltage is higher than the lamp voltage during arc discharge. Glow discharge uniformly and uniformly heats the electrodes without applying a voltage higher than necessary at a constant level.Appropriately heats the electrodes of the high-pressure discharge lamp 11 to prevent blackening due to sputtering, etc. Reduces the lamp voltage as shown in FIG. The starting secondary voltage is 1.2 kV peak-to-peak.
As described above, the limit voltage at the time of glow discharge is set to 150 Vrms to 350 Vrms. Further, by controlling the frequency during glow discharge and determining the starting secondary voltage at the oscillation stop level, the lighting can be maintained during glow discharge or the stress of the inverter circuit 23 at no load can be reduced.

A discharge lamp lighting device according to another embodiment will be described with reference to FIG.

FIG. 11 is a circuit diagram showing a discharge lamp lighting device according to another embodiment. The discharge lamp lighting device 14 according to the embodiment shown in FIG. 11 is a discharge lamp lighting device according to the embodiment shown in FIG.
14, a frequency control type constant power control circuit 37 is provided.

The constant power control circuit 37 connects a series circuit of the resistors R17 and R18 in parallel with the series circuit of the ballast choke L4 and the capacitor C5, and connects the connection point of the resistors R17 and R18 to the diode D15. It is connected to the gate of the field effect transistor Q7 through the gate. The drain and source of the field effect transistor Q7 are connected to both ends of the inductor L2 via a diode D16, and a capacitor is connected between the gate and source of the field effect transistor Q7.
C17 is connected.

Then, the lamp voltage is detected by the resistor R18, the lamp current is detected by the resistor R16, and the lamp power is detected based on the sum thereof. When the lamp power is increased, the gate voltage of the field effect transistor Q7 is increased. The oscillating frequency is changed by increasing the DC current amount of the inductor L2 to be bypassed by the field effect transistor Q7 and saturating the inductor L2, and when the lamp power is too large, the output is reduced, and conversely, the lamp power is too small. Then, the lamp power is increased, and the lamp power is changed so as to be always constant. As described above, by controlling the high-pressure discharge lamp 11 with constant power, the color can be made constant, and inverter stress due to excessive power such as at the end of life can be prevented.

A discharge lamp lighting device according to another embodiment will be described with reference to FIG.

FIG. 12 is a circuit diagram showing a discharge lamp lighting device according to another embodiment. The discharge lamp lighting device 14 according to the embodiment shown in FIG. 12 is similar to the discharge lamp lighting device according to the embodiment shown in FIG. 14, a constant power control circuit 38 as smoothing amount control type smoothing means is provided in place of the frequency control type constant power control circuit 37.

The constant power control circuit 38 includes a high-pressure discharge lamp
11 is connected in series with a resistor R21, a series circuit of resistors R22 and R23 is connected in parallel with a capacitor C6, and a transistor Q8 is connected to the connection point of the resistors R22 and R23.
The collector and the emitter of this transistor Q8 are connected between the output terminals of the full-wave rectifier circuit 22 via the resistor R24, and the capacitor C1 is connected between the base and the emitter of the resistor R8.
8 and a field effect transistor Q9 connected to the capacitor C2. The gate of the field effect transistor Q9 is connected to the collector of the transistor Q8.

Then, the lamp voltage is detected by the resistors R22 and R23, the lamp current is detected by the resistor R21, and the transistor Q8 is controlled based on the detected electric power.
Increasing the base current of Q8 reduces the apparent impedance between the collector and emitter of transistor Q8, lowering the gate voltage of transistor Q9 and increasing the apparent impedance between the drain and source of field effect transistor Q9. , Reduce the smoothing amount of the capacitor C2.
And the high-pressure discharge lamp is turned on with the lamp power kept constant. Since the lighting frequency is not changed,
Acoustic resonance can be prevented.

In each of the above embodiments, the field effect transistor Q1 and the field effect transistor Q2 have different polarities to form the complementary pair type half-bridge inverter circuit 23. In each case, the same polarity is used. The same effect can be obtained by using the field effect transistor Q1 and the field effect transistor Q2.

A discharge lamp lighting device according to another embodiment will be described with reference to FIG.

FIG. 13 is a circuit diagram showing a discharge lamp lighting device according to another embodiment. The discharge lamp lighting device 14 according to the embodiment shown in FIG. 13 is a discharge lamp lighting device according to the embodiment shown in FIG.
14, an inverter circuit 41 using a field effect transistor Q11 and a field effect transistor Q12 of the same polarity in place of the complementary pair type half bridge type inverter circuit 23, and a control circuit 42 as control means is different. It is.

First, a resistor R31 is connected between the diode D1 and the diode D3 and the capacitor C2.
, An inverter circuit 41 is connected in parallel, and in the inverter circuit 41, a field effect transistor Q11 and a field effect transistor Q12 having the same polarity are connected in series.
In addition, inductor L1, diode D1 and diode D2
Is connected to a field-effect transistor via a resistor R32.
Connected to the gate of Q11, a Zener diode ZD11
And a Zener diode ZD12 are connected in series with opposite polarities, and a resistor R33 is connected between the source and the gate of the field effect transistor Q12.

A capacitor C22, an inductor L5, and an inductor L6 magnetically coupled to a ballast choke L4 are connected in series between the gate and the drain of the field effect transistor Q11.
A capacitor C23, an inductor L6 magnetically coupled to the inductor L5, and a current flowing in a direction opposite to that of the inductor L5, and an inductor L6 magnetically coupled to the inductor L4 are connected in series between the gate and the drain of the capacitor C23. .

Further, a control circuit 41 as control means is connected in parallel with the capacitor C6.
Is connected to a series circuit of resistors R34 and R35.
A resistor R36 and a PTC element Z1 which is a temperature-sensitive resistor having temperature characteristics as temperature detecting means are connected in parallel with R35. The PTC element Z1 is disposed on the surface of the first wiring board 5 opposite to the high-pressure discharge lamp 11 and close to the ballast choke L4. The diode D21 and the capacitor C24 are connected in series with the resistor R35, and the Zener diode ZD is connected in parallel with the capacitor C24.
13 and a capacitor C25 in series, a resistor R37 is connected in parallel with the capacitor C25,
The connection point of the Zener diode ZD13 and the capacitor C25 is connected to the gate of the field effect transistor Q13. Further, a Zener diode ZD14 is connected between the drain and the source of the field effect transistor Q13,
The drain of the field effect transistor Q13 is connected to the gate of the field effect transistor Q12 via a Zener diode ZD15. A series circuit of a capacitor C38 and a capacitor C39 is connected in parallel with the Zener diode ZD14, and a capacitor C26 is connected in parallel with the capacitor C39. The connection point of the resistors R38 and R39 is connected to a field-effect transistor Q14, which is connected between the gate and the drain of the field-effect transistor Q12 via a capacitor C27, and the gate of the field-effect transistor Q12. ,
A capacitor C28 is connected between the drains.

Next, the operation of this embodiment will be described. The basic operation is the same as in the embodiment shown in FIG.

First, when the commercial AC power supply e is turned on, the resistance
R32, Zener diode ZD11, Zener diode ZD12,
A current flows through the path of the resistor R33, the Zener diode ZD13 and the Zener diode ZD14, and the field effect transistor Q12
The voltage between the gate and the source of the transistor increases, and the field effect transistor Q12 turns on. By turning on the field effect transistor Q12, the supply of the gate voltage from the resistor R33 is stopped, and the field effect transistor Q12 is turned off. At this time,
The energy stored in the ballast choke L4 is released, and the field effect transistor Q11 is turned on by the inductor L6 magnetically coupled to the ballast choke L4. According to the resonance frequency determined by the gate capacitance of the inductor L5, the inductor L6 and the field effect transistor Q11,
The field effect transistor Q11 turns off. Thereafter, the field effect transistor Q12 is turned on by the inductor L8 magnetically coupled to the ballast choke L4. The field-effect transistor Q12 is turned off in accordance with the resonance frequency determined by the inductor L8, the inductor L7, the capacitor C28, the capacitor C27, and the gate capacitance of the field-effect transistor Q12, and this is repeated thereafter. Note that inductor L5 and inductor L5
Since L7 is magnetically coupled, the capacitors C28 and C27 affect the on-time of the field-effect transistor Q11, and the field-effect transistor Q11 is off when the field-effect transistor Q12 is on. State, and when the field-effect transistor Q12 is off, the field-effect transistor Q11 is on, and the field-effect transistor Q11 and the field-effect transistor Q12 are turned on and off alternately. This prevents the transistor Q12 from turning on at the same time and causing a short circuit.

When the oscillation of the inverter circuit 23 starts, a current flows through the path of the zener diode ZD15, the resistor R38 and the capacitor C26. At this time, the capacitor C2
The voltage across the terminal 6 rises slowly and the field effect transistor
It is supplied as the gate voltage of Q14. Further, the field effect transistor Q14 changes the impedance between the drain and source of the field effect transistor Q14 with respect to the gate voltage, so that the impedance between the drain and source of the field effect transistor Q14 changes. The effective capacitance between the drain and source of the transistor Q14 changes continuously. Therefore, the operating frequency of the inverter circuit 23 changes continuously. If such a change in the frequency includes the no-load resonance frequency of the ballast choke L4 of the resonance circuit 26, the capacitors C5 and C6, the starting secondary voltage can be generated sufficiently high.

When the temperature of the ballast choke L4 rises, the resistance of the PTC element Z1 rises and the high pressure discharge lamp
The lamp voltage detection threshold of 11 is switched, the zener diode ZD13 turns on with a lower lamp voltage than at low temperatures, charges the capacitor C25, turns on the field effect transistor Q13, short-circuits the zener diode ZD14, and turns on the field effect transistor Q14. When turned on, the inverter circuit 41 intermittently oscillates at a low starting voltage. As described above, by reducing the output of the inverter circuit 41 at high temperatures, the stress applied to the electronic components such as the field effect transistors Q11 and Q12 at high temperatures is reduced.

That is, since the discharge lamp device 1 houses the discharge lamp lighting device 14 and the high-pressure discharge lamp 11 integrally, the temperature rises to near the rated temperature during use due to heat from the high-pressure discharge lamp 11. At such a high temperature, the stress applied to the electronic components such as the field effect transistors Q11 and Q12 is reduced. Also, if the frequency is fixed,
The saturation of the ballast choke L4 is large, the inductance at the time of saturation is small, the phase switching is deep, the no-load secondary voltage is low, and the phase oscillation can be continued without exceeding the threshold due to intermittent oscillation. Can be prevented. At this time, it is not necessary to enlarge the ballast choke L4 to extend the operating temperature range, and the size can be reduced.

Further, the voltage of the commercial AC power
V, when the lamp power of the high-pressure discharge lamp 11 is about 20 W, when the ambient temperature is 25 ° C., the peak, the toe,
The PTC element Z1 is set so that the peak is 2.9 kV or less, and if the ambient temperature is 150 ° C., the threshold peak, toe, and peak are 2.0 kV or less.
The no-load secondary voltage can be controlled to be 30% lower than in the case of

The PTC element Z1 is connected to the first wiring board 5
, The temperature of the ballast choke L4 can be accurately detected even if the ballast choke L4 is disposed on the rear side.

Another embodiment will be described with reference to FIG.

FIG. 14 is a perspective view showing the appearance of the lighting device.
The lighting device 51 shown in FIG. 14 has a fixture main body 52 mounted on a ceiling surface or the like and in which the discharge lamp lighting device 14 is stored,
An appliance base 54 is attached to the appliance main body 52 via a cylindrical body 53, a reflector 55 is attached to the appliance base 54, and the high-pressure discharge lamp 11 is attached to the reflector 55.

Since the discharge lamp lighting device 14 shown in FIGS. 1 to 13 is provided, the same functions and effects are provided.

In this case, the discharge lamp lighting device 14 may be of a separate type that is not housed inside the appliance body 52.

[0071]

According to the discharge lamp lighting device of the present invention, the inductor is saturated at the time of starting, and the glow discharge starting voltage of the high pressure discharge lamp and the arc discharge sustaining voltage point are connected by a continuous load curve. With 35
Since a high-pressure discharge lamp of W or less does not require measures against harmonics and has a low starting voltage, a voltage that can be generated by a resonance circuit is sufficient. For example, a high-voltage pulse generating circuit such as an igniter is not required, and the circuit can be downsized.

According to the discharge lamp lighting device of the second aspect,
In addition to the discharge lamp lighting device according to claim 1, when the starting voltage is continuously generated at the time of restarting the high-pressure discharge lamp at a high temperature, the inductor is saturated. As the switching loss increases and heat is generated, the inductor of the resonance circuit generates heat, and a large stress is applied to the inverter circuit, such as phase advance oscillation and excessive current, so that this stress can be prevented.

According to the discharge lamp lighting device of the third aspect,
In addition to the discharge lamp lighting device according to the second aspect, the no-load protection function can be intermittently operated by intermittent oscillation to prevent stress.

According to the discharge lamp lighting device of the fourth aspect,
In addition to the discharge lamp lighting device according to any one of claims 1 to 3, after the start of glow discharge is detected by the glow discharge detection means, the voltage is suppressed by the output control means and the electrode of the high pressure discharge lamp is gradually heated. Since the entire electrode can be heated uniformly, the amount of spattering of the electrode with the lower electrode temperature during the initial stage of arc discharge is suppressed, and the amount of evaporation of the electrode constituent material of the electrode with the higher electrode temperature is suppressed, resulting in blackening. Can be suppressed.

According to the discharge lamp lighting device of the fifth aspect,
In addition to the discharge lamp lighting device according to any one of claims 1 to 3, after the glow discharge detection means detects the start of glow discharge, the voltage is suppressed by the output control means and the electrodes of the high pressure discharge lamp are gradually heated. As a result, the entire electrode can be heated uniformly, so that the electrode with the lower electrode temperature is sputtered in the early stage of arc discharge, and the amount of evaporation of the electrode constituent material of the electrode with the higher electrode temperature is suppressed, resulting in blackening. In addition, since the transition time to the arc discharge becomes constant, for example, when a plurality of units are used at the same time, it is possible to suppress variations in lighting start.

According to the discharge lamp lighting device of the sixth aspect,
In addition to the discharge lamp lighting device according to the fourth or fifth aspect, since the output voltage is changed by changing the oscillation frequency of the inverter circuit, the voltage of the inverter circuit can be easily adjusted.

According to the discharge lamp lighting device of the seventh aspect,
In addition to the discharge lamp lighting device according to any one of claims 1 to 6, since the lamp power is kept constant, the color difference of the high-pressure discharge lamp can be suppressed, and the power does not become excessive even when the lamp voltage rises at the end of lamp life. , The inverter circuit can be protected.

According to the discharge lamp lighting device of the eighth aspect,
In addition to the discharge lamp lighting device according to claim 7, since the lamp power constant control is controlled by the saturation of the inductor in the drive circuit, the inductor can be saturated even with a small current.
The lamp power can be easily controlled.

According to the discharge lamp lighting device of the ninth aspect,
8. The discharge lamp lighting device according to claim 7, further comprising a smoothing unit for smoothing a voltage to the inverter circuit, and the lamp power constant control is performed by controlling a smoothing amount to the smoothing unit. Can easily control the lamp power.

According to the discharge lamp lighting device of the tenth aspect, in addition to the discharge lamp lighting device of the first aspect, when the temperature detected by the temperature detecting means is high, the output of the inverter circuit is output. By lowering the stress, it is possible to reduce stress applied to components such as switching elements when the temperature of the inverter circuit is high.

According to the discharge lamp lighting device according to the eleventh aspect, in addition to the discharge lamp lighting device according to any one of the first to tenth aspects, the temperature detecting means is disposed near the inductor of the resonance circuit. The temperature of the resonance inductor can be reliably detected, and, for example, the no-load secondary voltage related to the saturation level of the resonance inductor can be adjusted.

According to a twelfth aspect of the present invention, in addition to the discharge lamp lighting apparatus of the eleventh aspect, the discharge lamp lighting apparatus further comprises a substrate on which the inductor of the resonance circuit is mounted on a surface opposite to the surface on which the discharge lamp is located. Therefore, the temperature of the inductor of the resonance circuit can be detected without being affected by the heat of the discharge lamp.

According to the discharge lamp device of the thirteenth aspect, since the discharge lamp device is provided with the discharge lamp attached to the base for housing the discharge lamp lighting device of the first aspect, the respective effects can be obtained. it can.

According to the illumination device of the fourteenth aspect, since the discharge lamp lighting device according to any one of the first to twelfth aspects is provided with the fixture main body on which the discharge lamp is mounted, the respective effects can be obtained. .

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing a discharge lamp lighting device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing the discharge lamp device.

FIG. 3 is a plan view showing a surface of the circuit board.

FIG. 4 is a bottom view showing a back surface of the circuit board.

FIG. 5 is a graph showing load characteristics as lamp power and lamp voltage characteristics with respect to the lamp current.

FIG. 6 is a circuit diagram showing a discharge lamp lighting device according to another embodiment of the present invention.

FIG. 7 is a waveform chart showing an operation of the discharge lamp lighting device.

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

FIG. 9 is a waveform chart showing an operation of the discharge lamp lighting device.

FIG. 10 is a waveform chart showing an operation of the discharge lamp lighting device.

FIG. 11 is a circuit diagram showing a discharge lamp lighting device according to another embodiment of the present invention.

FIG. 12 is a circuit diagram showing a discharge lamp lighting device according to still another embodiment of the present invention.

FIG. 13 is a circuit diagram showing a discharge lamp lighting device according to still another embodiment of the present invention.

FIG. 14 is a perspective view showing an appearance of the lighting device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Discharge lamp device 11 High pressure discharge lamp 14 Discharge lamp lighting device 23, 41 Inverter circuit 25 Auxiliary resonance circuit 26 Resonance circuit 35 Glow discharge detection circuit as glow discharge detection means 36 Output control circuit as output control means 38 Smoothing means Constant power control circuit 42 Control circuit as control means 51 Lighting device 52 Fixture L4 Ballast choke Q1, Q2 as inductor Field effect transistor as switching element Z1 PTC element as temperature detecting means

Claims (14)

[Claims] 1. A power consumption of 35 W having a switching element.
An inverter circuit for lighting the following high-pressure discharge lamp;
A resonance circuit having an inductor and a capacitor, wherein the inductor is saturated at the time of starting so that the glow discharge starting voltage of the high pressure discharge lamp and the arc discharge sustaining voltage point are connected by a continuous load curve. Discharge lamp lighting device. 2. The discharge lamp lighting device according to claim 1, wherein the inverter circuit has a no-load protection function. 3. The discharge lamp lighting device according to claim 2, wherein the no-load protection function is provided by intermittent oscillation of a switching element of the inverter circuit. 4. A glow discharge detecting means for detecting a glow discharge, and after the start of the glow discharge is detected by the glow discharge detecting means, the output voltage is reduced to a level at which the glow discharge can be maintained. The discharge lamp lighting device according to any one of claims 1 to 3, further comprising output control means for increasing an output voltage from the voltage for a certain period of time to shift to an arc discharge. 5. A glow discharge detecting means for detecting a glow discharge, and after the start of the glow discharge is detected by the glow discharge detecting means, the output voltage is reduced to a level at which the glow discharge can be maintained. The discharge lamp lighting device according to any one of claims 1 to 3, further comprising output control means for canceling. 6. The discharge lamp lighting device according to claim 4, wherein the output control means changes the operating frequency of the inverter circuit to change the output voltage. 7. The discharge lamp lighting device according to claim 1, wherein the inverter circuit controls the lamp power to be constant. 8. The method according to claim 7, further comprising an auxiliary resonance circuit having an inductor and a capacitor for controlling resonance of the resonance circuit, wherein the constant lamp power control is performed by saturation of the inductor of the auxiliary resonance circuit. Discharge lamp lighting device. 9. The discharge lamp lighting device according to claim 7, further comprising: smoothing means for smoothing an input voltage to the inverter circuit, wherein the lamp power constant control is performed by a smoothing amount to the smoothing means. 10. A temperature detecting means for detecting a temperature of the inverter circuit, wherein when the temperature detected by the temperature detecting means is high, the output of the inverter circuit is lowered, and when the temperature is low, the output of the inverter circuit is output. The discharge lamp lighting device according to any one of claims 1 to 9, further comprising control means for increasing the pressure. 11. The temperature detecting means is disposed near an inductor of a resonance circuit.
0 The discharge lamp lighting device according to any one of the above. 12. The discharge lamp lighting device according to claim 11, further comprising a substrate for mounting an inductor of the resonance circuit on a surface opposite to a surface on which the discharge lamp is located. 13. A discharge lamp, comprising: the discharge lamp lighting device according to claim 1; a base housing the discharge lamp lighting device; and a discharge lamp attached to the base. apparatus. 14. An illuminating device comprising: the discharge lamp lighting device according to claim 1; and a fixture main body on which the discharge lamp is mounted.