JPH11135290A - Lighting device for discharge lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a wave shape of switching current by almost fixing a power supply voltage to an inverter circuit, even if it is phase-controlled by a phase control means. SOLUTION: An AC power source AC, a phase control means 1 and a lighting device connected to the phase control means 1 are provided, and the lighting device is composed of a rectifying/smoothing means and an inverter circuit 2 to supply a high frequency output from it to a lamp load 3. A phase-controlled voltage from the phase control means 1 is inputted to a modulated light circuit 4 as a modulated light signal, and actuation of the inverter circuit 2 is controlled so as to vary a high frequency power to supply an output of the modulated light control circuit 4 to the lamp load 3.

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 using phase control means.

[0002]

2. Description of the Related Art Conventionally, as a means for controlling the dimming of an incandescent lamp, there is a dimming device using a phase control means. The phase control means controls the phase angle of the power supply voltage by turning a volume provided in the phase control device. At the time of full lighting, the thyristor connected in series to the power supply voltage inside the phase control device is turned on in almost all sections of the power supply voltage, and the section (phase) in which the thyristor turns off by turning the volume gradually. And the phase angle of the power supply voltage applied to the lamp load (for example, an incandescent lamp) becomes narrower, and the power supplied to the incandescent lamp, which is a resistive load, decreases, so that continuous dimming lighting can be performed. is there.

An example in which this phase control means is applied to an inverter lighting device is an example of a conventional circuit shown in FIGS.
5 is a specific example of a circuit. The inverter lighting device converts an AC power supply into a DC power supply once by a rectifier circuit, receives the DC voltage, and supplies a high-frequency resonance current to an LC resonance circuit in the inverter circuit by turning on / off a high-frequency switching element. Then, the high-frequency power is supplied to the lamp load.

FIG. 11 shows a specific circuit example in which phase control means is connected to the power input side of the inverter lighting device. The input terminal of the inverter lighting device P, a Q, an AC power source is rectified by the rectifier circuit DB, inputs a DC power supply voltage smoothed by the smoothing capacitor C ₀ to the inverter circuit,
The circuit system supplies the high-frequency output to a lamp load. When the phase control means is connected to the power supply input side of the inverter lighting device and the volume thereof is turned to gradually increase the off period of the thyristor S inside the phase control device, the charging voltage to the electrolytic capacitor C ₀ becomes , The phase angle is 90
Until the temperature becomes °, the battery is charged at a voltage determined by the peak of the rectified pulsating voltage, and thus is constant, and the power supplied to the inverter circuit is also constant. At a phase angle of 90 ° to 180 °, the peak voltage of the rectified pulsating voltage decreases, so that the charging voltage of the electrolytic capacitor C0 decreases, the supply voltage to the inverter circuit decreases, and the output of the inverter circuit decreases. Therefore, the light output of the lamp load has a dimming curve as shown in FIG. Further, in the circuit system for completely smoothing the AC pulsating voltage as shown in FIG. 11, there is a problem that there are many harmonic components of the input current of the inverter device.

As a method for solving the above problems,
FIG. 12 is a specific circuit example in which the smoothing circuit has a ３ valley filling circuit configuration, and the power supply voltage waveform is as shown in FIG. This figure shows a voltage waveform when the thyristor of the phase control means is turned off to 90 °. In this case, the power supplied to the inverter circuit can be changed by controlling the phase angle from the point a. 13, the dimming curve can be changed linearly in accordance with the phase angle.

[0006] The inverter circuit of this type is concretely designed as a circuit.
The specific circuit example of FIG. 15 is replaced with the configuration. Sui
Switching element Q₁, Q_TwoSeries circuit is connected to the power input terminal
And one switching element Q₁In parallel with
L_Two, Resonance capacitor C ₈And coupling condensate
Sa C₇Are connected in series. Resonant capacitor C
₈Is connected in parallel with the lamp load,
The preheating current to the lamp filament is flowing. Switch
Ching element Q₁, Q_TwoAre alternately turned on and off at high frequencies
Then, resonance choke L_TwoAnd resonance capacitor C₈Co-oscillation of
Depending on the operation, the resonance capacitor C₈Run connected in parallel with
The high-frequency power is supplied to the lamp load to turn on the lamp load.
You. Switching element Q₁, Q_TwoThe drive control of the
Driver circuit by IR2155, a driver IC manufactured by KK
Is composed. Its operating frequency is the resistance R_Four, Conden
Sa C_FiveIs determined by the time constant of

[0007]

In the circuit shown in FIG. 15, a 1/3 valley filling circuit is formed in the power supply smoothing circuit, and harmonics of the input current which have become a problem in the circuit shown in FIG. 11 can be reduced. The dimming control by the phase control is performed at a phase angle of 90 °.
It is possible from before (from point a in FIG. 14), and there is an effect that dimming control can be made approximately linear by gradually widening the ON section of the thyristor of the phase control means. However, since the waveform of the power supply voltage V ₀ ′ supplied to the inverter circuit has a waveform as shown in FIG. 14, the switching current flowing through the switching elements Q ₁ and Q ₂ of the inverter circuit is as shown in FIGS. ). The on / off operating frequency of the switching elements Q ₁ and Q ₂ is determined by the resistor R ₄ and the capacitor C ₅ connected to the second and third terminals of the IR 2155 of the driver IC as described above. If the voltage is supplied to the inverter circuit, the switching current waveform flowing through the switching element Q _2, is a good slow waveform regenerative current flows as in FIG. 16 (b), the lower trough portion of the power supply voltage 16 (a), the switching current waveform becomes a waveform close to the same phase, and the switching current waveform becomes a waveform in which a mustache current flows. As a result, the switching loss increases, the power supply voltage fluctuates, and the circuit varies. There is a problem that the waveform enters the phase advance mode.

Therefore, according to the present invention, the power supply voltage to the inverter circuit is made substantially constant by the phase control by the phase control means to improve the switching current waveform. The present invention also proposes an inverter lighting device capable of performing dimming control and having a substantially constant dimming curve, and capable of dimming control by phase control.

[0009]

According to the present invention, in order to solve the above-mentioned problems, as shown in FIG.
C, a phase control means 1 including a switching element S connected in series to the AC power supply AC and an adjusting device for changing an ON interval of the switching element S, and a lighting device connected to the phase control means 1. The lighting device,
Rectifying means DB, a smoothing means C ₀ for smoothing the output of the rectifier means DB, is an inverter circuit 2 for supplying a high-frequency output to the lamp load 3 receives the output of the smoothing means C _0, the inverter circuit 2, In a discharge lamp lighting device configured with a switching element that turns on / off at a high frequency and an LC resonance circuit and supplies high-frequency power to a lamp load 3 by its resonance operation, the phase-controlled voltage from the phase control means 1 is applied to the discharge lamp lighting device. The operation of the inverter circuit 2 is controlled so as to be input to the dimming control circuit 4 as a dimming signal, to receive the output of the dimming control circuit 4, and to change the high frequency power supplied to the lamp load 3. Is what you do.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION

(Embodiment 1) FIG. 1 shows a basic circuit configuration of Embodiment 1 of the present invention. The input terminals P and Q of the inverter lighting device are connected to the output terminals of the phase control means connected to the AC power supply AC. The inverter lighting device rectifies the AC power source AC by rectifier bridge DB, in which the substantially constant DC voltage smoothed by the smoothing capacitor C ₀ is input to the inverter circuit, the inverter circuit, the switching element on/
A high frequency switching operation by turning off and a resonance operation by a resonance circuit composed of a choke, a capacitor, etc. in the inverter circuit. The high frequency power is supplied to the load (lamp) and the lamp is turned on at high frequency. is there. From the input side of the rectifier circuit DB of this inverter lighting device, diodes D ₁ and D ₂ detect the output voltage of the phase control means as a pulsating DC voltage and input it to the dimming control circuit.
In response to the output voltage from the phase control means, a signal voltage for dimming control is input to the inverter circuit. Then, it is a feature of the present invention to control the output of the inverter circuit according to the signal voltage.

FIG. 2 shows a specific circuit configuration example of this embodiment. The inverter circuit is described in the conventional circuit.
This is the same circuit system as the inverter circuit of FIG. The switching operation frequency of this circuit is 2
The number is determined by the resistor R ₄ and the capacitor C ₂ connected to the third and third terminals. In the embodiment circuit of Figure 2, by connecting a capacitor C ₃ through the switching element Q ₃ in parallel with the capacitor C _2, to switch the operating frequency of the switching elements Q _1, Q ₂ switches the charging time constant The dimming control is performed by using

The dimming control circuit comprises a comparator CP, its reference voltage E ₀ and detection resistors R ₁ and R _2, and a pulsating power supply voltage phase-controlled by detection diodes D ₁ and D _2. Is detected and divided by the resistors R ₁ and R _{2 to} obtain a detection voltage E ₁ . In comparison with the detected voltage E ₁ and the reference voltage E _0, compared with the detected voltage E ₁ exceeds the reference voltage E ₀ unit CP
Becomes high level. In that case, MOSFE
Since the switching element Q ₃ made of T is on,
The operating oscillation frequency of the driver IC (IR2155) is a frequency f ₂ determined by the resistor R ₄ and the capacitor (C ₂ + C ₃ ).
Becomes In a section where the detection voltage E ₁ is lower than the reference voltage E ₀ , the output of the comparator CP is at a low level.
The switching element Q ₃ is turned off, the driver IC (I
Operating the oscillation frequency of the R2155), the resistance R _4, the frequency f ₁ determined by the capacitor C _2. The relationship between the frequencies f ₁ and f ₂ is represented by f ₂ > f ₁ .

FIG. 3 shows the relationship between the phase-controlled detection voltage E ₁ and the lamp current Ila. When the detection voltage E ₁ will change as shown by the control of the phase control means, if you set the reference voltage E ₀ to a lower voltage, the output of the comparator CP at the moment the power supply voltage rises to High level Therefore, as described above, the operating frequency of the inverter circuit is f ₂
And the output increases. Conversely, during the period when there is no AC power supply voltage, that is, during the period when the thyristor S inside the phase control means is off, the inverter circuit operates at the operating frequency f
_Operates at ₁ , the output decreases. Power of the inverter circuit at this time is supplied from the capacitor C _0. FIG. 3 also shows that the section operating at the frequency f ₁ corresponds to the lamp current Ila.
Low peak value Iop, section operating at a frequency f _2, it is seen peak value Iop of the lamp current is high.

The ratio between the _two frequencies f ₁ and f ₂ is determined by the section in which the thyristor S provided in the phase control means is on / off. If the section in which the thyristor S is on is wide, the inverter interval the output of the circuit is increased (section of the operating frequency f ₂₎ is to become wider against interval the output of the inverter circuit is reduced (the operating frequency f ₁ of the segment), as the output of the inverter circuit It works increasing direction, on the contrary, the operating frequency f ₁ of the interval if widely with respect to sections of the operating frequency f _2, operates in a direction to decrease the output of the inverter circuit. in this way,
By varying the ON period of the thyristor S of the phase control means, the two operating frequencies f ₁ and f ₂ of the inverter circuit are changed.
The light output of the lamp can be changed in the range of _two operating frequencies f ₁ and f ₂ by changing the operation ratio of the lamp.

In this embodiment, the power supply voltage supplied to the inverter circuit is a substantially constant voltage V _C0 as shown in FIG. 5A, which is smoothed by the smoothing capacitor C ₀ , and the phase angle of the phase control means is 90. Up to °, 90 ° to 1
In the range of 80 °, the power supply voltage waveform decreases in accordance with the peak value of the power supply voltage. Therefore, in the dimming control operation in this example, in the range of 90 ° to 180 °, dimming control can be performed by both the output decrease due to the power supply voltage decrease and the output decrease due to the operation frequency.

(Embodiment 2) FIG. 4 shows a second embodiment.
This circuit has a configuration in which a boost chopper circuit and a filter circuit (inductor L ₀ and capacitor C ₁ ) are added to the basic circuit configuration of FIG. FIG. 6 shows a specific circuit configuration. In this embodiment, since the power supply circuit is constituted by the boost chopper circuit, the power supply voltage V _C0 ′ supplied to the inverter becomes a boosted voltage, and as compared with the first embodiment of FIG. 90 ° angle
The output can be controlled to be somewhat constant by the chopper operation when the peak value of the power supply voltage decreases in the range of up to 180 °, and as shown in FIG.
It also has the effect of reducing harmonic components of the input current.

(Embodiment 3) FIG. 8 shows a third embodiment.
In this embodiment, the power supply voltage of the inverter circuit is a non-smooth pulsating DC power supply, thereby reducing the input current harmonics and, when the load is a discharge lamp, reducing the pause period of the discharge lamp. In order to smoothly perform dimming control by the phase control, a boost chopper circuit is used.

A phase control means is connected to the AC power supply AC, and the phase-controlled output is rectified by the diode bridge DB, and the output boosted by the boost chopper circuit which is a feature of this embodiment is relatively small. The boosted pulsating DC voltage V _C0 received by the capacitor C ₀ having a capacity is supplied to the inverter circuit.

FIG. 9 shows the function of the boost chopper circuit of the present embodiment.
This will be described below. Ripple DC supplied to the inverter circuit
When the voltage is not boosted, the voltage V in FIG._Aof
The output voltage waveform of the inverter circuit at that time.
The envelope has the waveform of A in FIG. 9B. In this case,
The peak value of the output voltage of the inverter circuit is the ignition voltage of the lamp
Is θa when the phase angle reaches
Period t to reach_TwoThen, the lamp is
Since the lamp voltage is not supplied, the load on the inverter
Discharge lamp will not light up. That is, if the phase angle is 0
T to θa _TwoDuring the period, there is a pause in the light output
I will. In the present invention, the power supply to the inverter circuit is provided.
Since the pressure is raised by the boost chopper circuit,
The voltage is V in FIG._BAnd the boost chopper times
V with no road added_ACompared to the waveform of
Value increases. As a result, the output power of the inverter circuit is
The pressure also has a waveform as shown in B of FIG.
The phase angle θb reaching the voltage is smaller than the phase angle θa.
You. Therefore, it is not possible to light the lamp at the phase angle θb.
The light output pause period is t₁And the boost chopper times
Pause section t when no road is added_TwoBe shorter than
Can be. Thus, in this embodiment, the ignition of the discharge lamp
Because the section is widened, do not add a boost chopper circuit.
The dimming control range by the phase control means is wider than
It has an effect that can be reduced.

(Embodiment 4) FIG. 10 shows a fourth embodiment. This embodiment has a circuit configuration in which the dimming control circuit of the first embodiment shown in FIG. 2 is added to the circuit of the third embodiment shown in FIG. 8, and a step-up chopper circuit is added to widen the phase angle. The dimming control is possible within the range, and the output voltage of the phase control means is input to the dimming control circuit as a dimming signal, and the operating frequency of the inverter circuit is controlled so that the optical output becomes linear. By performing the control, the adjustment range of the light output control can be expanded as compared with the case where the light control is performed only by the phase control of the power supply voltage.

(Embodiment 5) FIG. 17 shows Embodiment 5 of the present invention. In the figure, 1 is a phase control means, 2 is an inverter circuit,
Reference numeral 3 denotes a lamp, 4 denotes a dimming control circuit, 7 denotes an input voltage detection circuit, and 8 denotes a control power supply circuit. In this embodiment, the dimming control of the inverter circuit 2 relative to the phase angle of the phase control unit 1, and to the phase angle 90 ° charging voltage is substantially constant to the electrolytic capacitor C _0, the charging voltage of the electrolytic capacitor C ₀ The switching is performed in a range of 90 ° to 180 °, which decreases as the phase angle increases. Specifically, the operation frequency control of the switching elements Q ₁ and Q ₂ is changed as shown in FIG. Thus, the rate of change of the dimming curve is made substantially constant at all phase angles.

The circuit of FIG. 17 has the same input power as the circuit of FIG.
A pressure detection circuit 7 is provided. That is, phase-controlled
Input voltage to diode D₁, D_TwoRectified by resistance
R₁, R _TwoE divided by₁Is the input terminal of the comparator CP.
And the reference voltage E is applied to the + input terminal of the comparator CP.₀
And output power having a duty corresponding to the phase angle.
Pressure E_TwoIs occurring. Input voltage E of comparator CP₀,
E₁And the output voltage E_TwoIs as shown in FIG. here
And the reference voltage E₀Output voltage when
E_TwoAt the moment when the power supply voltage rises,
When the power supply voltage drops to almost 0V
Output voltage E_TwoT of the output waveform of₁Time
Setting, the phase angle of the phase control means can be detected.
come. Here, this output voltage E_TwoMicrocomputer waveform etc.
Is input to the control circuit IC3 using the fixed period T shown in FIG.
And variable period t₁Phase angle by counting
Put out.

First, a fixed time T is counted when the power is turned on.
The frequency of the commercial power supply (50 Hz or 60 Hz).
Hz) and determine the variable period t₁Against the commercial power frequency
Is set to perform inverter control according to. Inva
The transformer circuit controls the transformer Tf by the output of the control circuit IC3.
Switching element Q₁, Q_TwoAlternately on / off
To supply high-frequency power to the lamp load.
The circuit operation is the same as in FIG. this
The output frequency of the control circuit IC3 is changed to the variable period t in FIG.₁
Change according to the
Switching element Q ₁, Q_TwoChange the operating frequency of
The output of the inverter circuit is changed with respect to the phase control signal.
It is. This allows the inverter to respond to the phase control signal.
Output control of the data circuit.

In this embodiment, by setting the change in the switching frequency of the inverter circuit according to the phase angle as shown in FIG. 19A, the phase angle at which the power supply voltage of the inverter circuit is constant is up to 90 °. Since the operating frequency of the inverter gradually increases as the phase angle increases, the output of the inverter circuit operates in a decreasing direction.
When the phase angle is in the range of 90 ° to 180 °, the operating frequency of the inverter is constant, and the power supply voltage of the inverter circuit gradually decreases as the phase angle increases, so that the output of the inverter circuit decreases. Operate. By the above operation, in the entire phase range of the phase angle of the phase control means,
The rate of change of the dimming curve can be made substantially constant.

In the example of FIG. 19A, the phase angle is 90
Although the frequency is constant in the range of 180 ° to 180 °, the phase angle is 90 ° to
In the range of 180 °, the phase angle is reduced by decreasing the frequency as the phase angle increases, or by decreasing the rate of increase of the frequency with respect to the increase in the phase angle as shown in FIG. It is also possible to control so that the rate of change of the dimming curve before and after the conversion point of the control of the degree becomes more constant. That is, as the dimming control by the operation control of the inverter circuit, the light output is controlled to decrease in the direction up to the phase angle of 90 °, and the light output is made constant or increased in the range of the phase angle in the range of 90 ° to 180 °. Direction, or by lowering the light output while decreasing the rate of change of the dimming control for the range up to 90 ° in phase angle, in accordance with the change in the power supply voltage supplied to the inverter circuit. The change rate of the dimming curve of the discharge lamp lighting device is made substantially constant.

In the present embodiment, the phase angle is detected by counting the time t ₁ , which is the off period of the thyristor of the phase control means. However, the time t ₂ , which is the on period of the thyristor, is counted. Is also good.

(Embodiment 6) FIG. 20 shows Embodiment 6 of the present invention.
Show. This embodiment is similar to the fifth embodiment in that the phase-controlled input is performed.
Rectifies and divides the output voltage and outputs the voltage E to the comparator CP.₁Enter as
And the reference voltage E ₀Output voltage E obtained by comparing_TwoTo
This is input to the control circuit IC3. Control circuit IC3
Is composed of a microcomputer and the inverter
The circuit uses the output of the control circuit IC3 to operate the transformer Tf.
Through the switching element Q₁ON / OFF
The so-called single-stone type that supplies high-frequency power to the pump load
It is Bata.

In this embodiment, the control circuit of the inverter circuit
IC3 is the output voltage E of the comparator CP. _TwoTime t₁, T_Two
Are respectively counted in the control circuit IC3.
“T” represented by 8_Two-T₁And calculate the absolute value
The switching duty ratio of the inverter circuit
It is set as shown in FIG. This
As the phase angle changes, the switching of the inverter circuit
The duty ratio is controlled. Therefore,
Until the phase angle increases to 90 °, the phase angle increases.
The duty ratio of the inverter's operating frequency
The output of the inverter circuit decreases.
However, when the phase angle is in the range of 90 ° to 180 °, the phase angle is large.
The operating frequency of the inverter circuit
Power ratio of the inverter circuit
The output of the inverter circuit decreases only by the voltage drop
And the entire phase angle range as in the fifth embodiment.
Control so that the rate of change of the dimming curve is almost constant.
Can be.

(Embodiment 7) FIG. 23 shows the operation of Embodiment 7 of the present invention. FIG. 22 shows an operation of a comparative example with respect to the present embodiment. The circuit configuration of this embodiment is the same as that of FIG. In this embodiment, in the inverter lighting device in which the phase control means for controlling the power supply phase angle is connected to the power supply, it is possible to start the lamp even when the dimming level is set to the minimum value (Min) at the time of starting the lamp. An inverter lighting device that does not generate hysteresis in lighting characteristics with respect to a phase angle is proposed.

As described above, the phase angle of the phase control means is 9
At 0 ° or more, the power supply voltage supplied to the inverter circuit decreases according to the peak value of the phase-controlled power supply voltage. When the input voltage of the inverter circuit decreases, the lamp voltage applied to the lamp load cannot be secured, and the lamp goes out. Further, there is a problem that the lamp cannot be started if the power supply voltage is lower than a predetermined value. If the phase angle is decreased from the state where the phase control means is turned off (phase angle 180 °), the minimum dimming level of the original dimming level is required. Since the start cannot be performed with the value (Min) but started when the phase angle is changed to a shallower dimming level, hysteresis occurs in the dimming characteristic with respect to the phase angle as shown in FIG. Therefore,
Even if it is desired to light the dimming level at the minimum value (Min) at the time of starting the lamp, the dimming level must be lowered once after adjusting the volume of the phase control means to a level that satisfies the power supply voltage that can be started. In addition, if the light is turned off by mistake when adjusting the volume to a deep dimming level, the dimming level must be raised again to a shallow region and adjusted, and it is particularly difficult to set a deep dimming level. .

Therefore, in the present embodiment, as shown in FIG. 23, in a region where the input voltage of the inverter circuit is reduced by the phase control by the phase control means, the power supply necessary for the inverter circuit to start the lamp is required. Voltage V
For dco, the minimum value (Min) of the dimming level is set to a phase angle at which the power supply voltage Vdc is equal to or higher than Vdco. That is, the input voltage of the inverter circuit is Vdc
when the phase angle by the phase control means when the o is the x _0, by a phase angle as a dimming control by dimming level Min to the phase angle x ₁ to be x ₁ ≦ x _0, dimming Even if the level is at the minimum value (Min), Vd
This means that a power supply voltage equal to or higher than co is supplied.

Therefore, in the entire dimming level section, smooth dimming control without hysteresis or the like can be performed in the control of turning off the light output from the maximum value (Max) to the minimum value (Min) and turning off the light output. In addition, since the power supply voltage that generally causes the lamp to extinguish is lower than Vdco, extinguishing due to insufficient power supply voltage of the inverter circuit is also eliminated, and the maximum (Max) and minimum (M) of the dimming level within the dimming control range.
in), it is possible to control turning off.

(Eighth Embodiment) FIG. 24 shows the control of the eighth embodiment of the present invention. The circuit configuration of this embodiment is the same as that of FIG. FIG. 24 is a graph of the dimming level with respect to the phase angle.
Is set. That is, the phase angle x ₂ where the dimming level becomes a minimum value (Min) and x ₂ ≦ 90 °. In the control of this embodiment, the total dimming level can be controlled within a range where the power supply voltage Vdc of the inverter circuit is stable, and the peak value of the input current waveform can be suppressed.

The input current waveform of the capacitor input type circuit configuration as shown in FIG. 17 flows near the peak value of the pulsating voltage as shown in FIG. Therefore, when an equal output voltage is obtained and the input voltage is phase-controlled, the input current waveform is hardly affected as shown in FIG. Is 90 °
When the input voltage exceeds the threshold value, the input voltage value when the input current flows is low as shown in FIG. 27, so that the peak value of the input current is high. Therefore, the minimum value of the dimming level (M
By setting in) to a phase angle of up to 90 °, in addition to the effect of the seventh embodiment, the peak value of the input current can be suppressed low.

Ninth Embodiment FIG. 28 is a circuit diagram of a ninth embodiment of the present invention. In the above-described seventh or eighth embodiment, the control is performed only in a partial range with respect to all the phase angles that can be controlled by the phase control means, in fact, all the angles of the volume and the like. Although there is no problem in the control characteristics, there remains an operational problem that the volume operation in a region where the phase angle is large by the phase control is not involved in the output adjustment at all and the light is already turned off. Therefore, the present embodiment proposes an inverter lighting device capable of performing dimming control at all phase angles that can be controlled by the phase control means.

In the circuit shown in FIG. 28, a phase control means is connected in parallel with the AC power supply AC, the output of which is rectified by the diode bridge DB, the boost chopper circuit which is a feature of the present invention is connected, and the output is connected to the capacitor C _0. And supplies the boosted DC voltage to the inverter circuit. With this configuration, as shown in FIG. 29, the power supply voltage of the inverter circuit is constant over a wide range of the phase angle, so that the controllable range by the dimming control is greatly expanded, and the condition of the stable power supply voltage Dimming control is possible.

[0037]

According to the present invention, in a lighting device for controlling dimming of a lamp load by connecting a phase control means to a power supply of an inverter lighting device, when a power supply voltage of an inverter circuit is smoothed, a power supply phase angle is reduced. By detecting the voltage of the phase control means even in the interval of 0 ° to 90 ° and inputting it to the inverter circuit as a dimming signal in the dimming control circuit, the effect that continuous dimming control is possible is obtained. is there. Further, by adding the boost chopper circuit to the power supply smoothing circuit, it is possible to reduce the harmonic distortion of the phase input current and suppress the power supply drop in the section where the phase angle is 90 ° to 180 ° by the chopper control. have. In addition, even when the power supply of the inverter circuit is directly connected to a device with phase control, which is often used for incandescent lamp devices, dimming lighting from a phase angle of 0 ° is also possible. Have.

According to the fourth aspect of the present invention, in the inverter lighting device using the non-smooth power supply that does not smooth the AC pulsating voltage, the effect of the inverter circuit using the pulsating DC voltage is obtained by connecting the boosting chopper means to the power supply circuit. In addition, it is possible to shorten the rest period in which the discharge lamp serving as the load is ignited, and has the effect that the dimming control by the phase control means can be performed in a wide range. Further, a dimming control circuit for detecting the output voltage of the phase control means inputs the dimming signal to the inverter circuit. The output of the phase control means is controlled by the power supply voltage and the dimming signal to control the phase of the power supply voltage. The dimming control can be performed more smoothly and linearly than the dimming control by using

According to the eighth to eleventh aspects of the present invention, the phase angle is 9% with respect to the change rate of the dimming signal up to the phase angle of 90 °.
By reducing the rate of change of the dimming signal from 0 ° to 180 °, in the entire phase range of the phase angle of the phase control means,
The rate of change of the dimming curve can be made substantially constant.

According to the twelfth aspect of the present invention, the phase angle at which the dimming level is minimized with respect to the phase control from the phase control means is equal to or greater than the power supply voltage of the inverter circuit required to start the lamp. By setting the phase angle to be, the light output can be controlled from the maximum to the minimum and then turned off in the entire dimming level section, and the dimming control without hysteresis can be performed in the reverse control. The dimming due to the shortage of the power supply voltage of the inverter circuit is also eliminated, and the control of the dimming level from the maximum to the minimum, and the extinguishing can be performed within the dimming control range. Further, by setting the phase angle at which the dimming level is minimized to 90 ° or less, the peak value of the input current can be suppressed low.

According to the fourteenth aspect of the present invention, a constant power supply voltage is always supplied to the inverter circuit via the step-up chopper, even if the phase-controlled voltage is input from the phase control means, so that stable operation can be achieved. Dimming control becomes possible,
The light output can be adjusted within a wide section of the phase control, and the light output can be adjusted from maximum to minimum,
Then, in the control to decrease to the light-off state and the reverse control, smooth dimming control without hysteresis and the like can be performed, and the disappearance due to insufficient power supply voltage of the inverter circuit can be eliminated.

[Brief description of the drawings]

FIG. 1 is a block circuit diagram showing a basic configuration of a first embodiment of the present invention.

FIG. 2 is a circuit diagram showing a specific configuration of Embodiment 1 of the present invention.

FIG. 3 is a waveform chart for explaining the operation of the first embodiment of the present invention.

FIG. 4 is a block circuit diagram showing a basic configuration of a second embodiment of the present invention.

FIG. 5 is a waveform diagram of an inverter power supply voltage according to a second embodiment of the present invention.

FIG. 6 is a circuit diagram showing a specific configuration of a second embodiment of the present invention.

FIG. 7 is a waveform chart showing an input current and a load current according to the second embodiment of the present invention.

FIG. 8 is a block circuit diagram showing a basic configuration of a third embodiment of the present invention.

FIG. 9 is a waveform chart for explaining the operation of the third embodiment of the present invention.

FIG. 10 is a block circuit diagram showing a basic configuration of a fourth embodiment of the present invention.

FIG. 11 is a circuit diagram of Conventional Example 1.

FIG. 12 is a circuit diagram of a second conventional example.

FIG. 13 is an explanatory diagram of the operation of Conventional Example 1.

FIG. 14 is an operation explanatory diagram of the second conventional example.

FIG. 15 is a circuit diagram of a third conventional example.

FIG. 16 is an operation explanatory diagram of the conventional example 3.

FIG. 17 is a circuit diagram according to a fifth embodiment of the present invention.

FIG. 18 is a waveform chart for explaining the operation of the fifth embodiment of the present invention.

FIG. 19 is an explanatory diagram illustrating control characteristics of Embodiment 5 of the present invention.

FIG. 20 is a circuit diagram of a sixth embodiment of the present invention.

FIG. 21 is an explanatory diagram illustrating control characteristics of Embodiment 6 of the present invention.

FIG. 22 is an explanatory diagram illustrating control characteristics of a comparative example with respect to the seventh embodiment of the present invention.

FIG. 23 is an explanatory diagram illustrating control characteristics according to the seventh embodiment of the present invention.

FIG. 24 is an explanatory diagram illustrating control characteristics according to the eighth embodiment of the present invention.

FIG. 25 is a waveform chart showing an operation in the case where the phase control is not performed according to the eighth embodiment of the present invention.

FIG. 26 is a waveform chart showing an operation in the case where the phase angle is small according to the eighth embodiment of the present invention.

FIG. 27 is a waveform chart showing an operation when the phase angle is large according to the eighth embodiment of the present invention.

FIG. 28 is a circuit diagram of a ninth embodiment of the present invention.

FIG. 29 is an explanatory diagram showing control characteristics of Embodiment 9 of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Phase control means 2 Inverter circuit 3 Lamp 4 Dimming control circuit

Claims (14)

[Claims] 1. A phase control means including an AC power supply, a switching element connected in series to the AC power supply, and an adjusting device for changing an ON period of the switching element, and a lighting device connected to the phase control means. Wherein the lighting device comprises a rectifier, a smoother for smoothing the output of the rectifier, and an inverter circuit that receives the output of the smoother and supplies a high-frequency output to a lamp load. In a discharge lamp lighting device configured to include a switching element that is turned on / off by a switch and an LC resonance circuit, and to supply high-frequency power to a lamp load by its resonance operation, a dimming control is performed on the phase-controlled voltage from the phase control means. The dimming signal is input to a circuit, and the output of the dimming control circuit is received to change the high frequency power supplied to the lamp load. A discharge lamp lighting device for controlling operation of a barter circuit. 2. The dimming control circuit includes a rectifying element for rectifying an output voltage of the phase control means, and a determining circuit for comparing a detection voltage obtained by the rectifying element with a reference voltage,
2. The discharge lamp lighting device according to claim 1, wherein an output voltage of the determination circuit is input to the inverter circuit as a dimming signal. 3. The inverter circuit includes means for switching between two frequencies, a first operating frequency of the switching element and a second operating frequency higher than the first operating frequency, wherein the switching means comprises: 3. The discharge lamp lighting device according to claim 2, wherein the switching operation is performed at a ratio according to the phase of the phase-controlled voltage from the phase control means based on the output voltage of the determination circuit. 4. The smoothing means includes a boost chopper circuit, and a capacitor is connected to an output of the boost chopper circuit.
The discharge lamp lighting device according to claim 1, wherein the voltage across the capacitor is a pulsating DC voltage higher than a pulsating DC voltage obtained by rectifying the AC power supply voltage. 5. The control circuit according to claim 1, wherein said inverter circuit includes operation control means for changing dimming control in accordance with the phase of the pulsating voltage subjected to phase control from said phase control means. Lighting device. 6. The discharge lamp lighting device according to claim 5, wherein the dimming control in the operation control means includes a control for changing a frequency for turning on / off a switching element of the inverter circuit. 7. The discharge lamp lighting device according to claim 5, wherein the dimming control in the operation control means includes a control to change a duty ratio for turning on / off a switching element of the inverter circuit. 8. The inverter circuit according to claim 1, wherein the phase control unit performs dimming control with a phase angle of up to 90 ° and dimming control with a phase angle in a range of 90 ° to 180 °. 2. The discharge lamp lighting device according to claim 1, further comprising an operation control unit for switching a rate of change of dimming control. 9. The dimming control by the operation control means,
9. The method according to claim 8, wherein the controller controls the light output of the lamp load to be lower until the phase angle is 90 degrees, and controls the dimming control to be constant when the phase angle is in the range of 90 degrees to 180 degrees. Discharge lamp lighting device. 10. The dimming control by the operation control means controls the light output of the lamp load to decrease in a direction up to a phase angle of 90 °, and increases the light output in a range of a phase angle from 90 ° to 180 °. The discharge lamp lighting device according to claim 8, wherein the control is performed in the direction. 11. The dimming control by the operation control means controls the light output of the lamp load to decrease in accordance with the increase of the phase angle, and when the phase angle is in a range of 90 ° to 180 °, the phase angle is 90 °. 9. The discharge lamp lighting device according to claim 8, wherein the rate of change of the dimming control is reduced as compared with up to °. 12. In the operation control means of the inverter circuit, the phase angle at the lower limit of dimming is such that the power supply voltage of the inverter circuit starts and lights the lamp load by the supply of a phase-controlled voltage from the phase control means. 2. The discharge lamp lighting device according to claim 1, wherein the phase angle is equal to or less than a phase angle at which a oscillating output voltage is obtained. 13. The operation control means of the inverter circuit, wherein a phase angle at the lower limit of dimming with respect to a phase angle of the phase control means is set to a phase angle of 90 ° or less. Discharge lamp lighting device. 14. The discharge lamp lighting device according to claim 4, wherein the DC voltage supplied to the inverter circuit is controlled to be substantially constant when the phase angle is in a range from 90 ° to 180 °.