JP3861411B2 - Discharge lamp lighting device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a discharge lamp lighting device using phase control means.
[0002]
[Prior art]
Conventionally, there is a light control device using phase control means as means for light control of an incandescent lamp. 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 with the power supply voltage inside the phase control device is turned on in almost all the sections of the power supply voltage, and the section (phase) in which the thyristor is turned off by turning the volume gradually. The phase angle of the power supply voltage applied to the lamp load (for example, an incandescent lamp) becomes narrower, the power supplied to the incandescent lamp, which is a resistance load, decreases, and the light can be continuously dimmed. is there.
[0003]
An example in which this phase control means is applied to an inverter lighting device is a specific circuit example of FIGS. 11, 12, and 15 which is a conventional circuit example. The inverter lighting device converts the AC power source into a DC power source once by the rectifier circuit, receives the DC voltage, and flows a high-frequency resonance current to the LC resonance circuit in the inverter circuit by turning on / off the high-frequency of the switching element. Thus, the high-frequency power is supplied to the lamp load.
[0004]
The specific circuit example of FIG. 11 is obtained by connecting phase control means to the power input side of the inverter lighting device. The input terminal of the inverter lighting device is P and Q, the rectifier circuit DB rectifies the AC power supply, and the smoothing capacitor C₀In this circuit system, the smoothed DC power supply voltage is input to the inverter circuit and the high frequency output is supplied to the lamp load. When the phase control means is connected to the power input side of the inverter lighting device and the volume is turned to gradually increase the off period of the thyristor S in the phase control device, the electrolytic capacitor C₀Until the phase angle reaches 90 °, the charging voltage is constant because it is charged at a voltage determined by the peak of the rectified pulsating voltage, and the power supplied to the inverter circuit is also constant. At the phase angle of 90 ° to 180 °, the peak voltage of the pulsating voltage after rectification is lowered, so that the charging voltage of the electrolytic capacitor C0 is lowered, the supply voltage to the inverter circuit is lowered, and the output of the inverter circuit Therefore, the light output of the lamp load becomes a dimming curve as shown in FIG. Further, in the circuit system that completely smoothes 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.
[0005]
As a method for solving the above problems, the smoothing circuit has a 1/3 valley filling circuit configuration in the specific circuit example of FIG. 12, and its power supply voltage waveform is as shown in FIG. This figure shows the voltage waveform when the thyristor of the phase control means is turned off to 90 °. In this case, the phase angle can be changed from the point a to change the power supplied to the inverter circuit. From FIG. 13, the dimming curve can be changed linearly according to the phase angle.
[0006]
The specific circuit example of FIG. 15 is obtained by replacing the inverter circuit of this system with a specific circuit configuration. Switching element Q₁, Q₂Is connected to the power input terminal, and one switching element Q₁In parallel with the resonance choke L₂, Resonant capacitor C₈And coupling capacitor C₇Are connected in series. Resonant capacitor C₈Are connected in parallel with the lamp load, and a preheating current is supplied to the lamp filament when the lamp is lit. Switching element Q₁, Q₂Is alternately turned on and off at high frequencies, the resonant choke L₂And resonant capacitor C₈The resonant operation of the resonant capacitor C₈The high frequency power is supplied to the lamp load connected in parallel, and the lamp load is turned on. Switching element Q₁, Q₂In the drive control, a drive circuit by IR2155 which is a driver IC manufactured by IR is configured. Its operating frequency is resistance R_Four, Capacitor C_FiveDetermined by the time constant of
[0007]
[Problems to be solved by the invention]
In the circuit of FIG. 15, a 1/3 valley filling circuit is configured in the power supply smoothing circuit, which can reduce harmonics of the input current, which is a problem in the circuit of FIG. 11, and dimming control by phase control is possible. The phase angle is possible from before 90 ° (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, the power supply voltage V supplied to the inverter circuit₀Since the waveform of 'becomes a waveform as shown in FIG. 14, the switching element Q of the inverter circuit₁, Q₂The switching current flowing in the waveform has waveforms as shown in FIGS. Switching element Q₁, Q₂As described above, the on / off operating frequency of the resistor R is the resistance R connected to the 2nd and 3rd terminals of the IR2155 of the driver IC._Four, Capacitor C_FiveWhen the voltage at the peak of the power supply voltage is supplied to the inverter circuit, the switching element Q₂The switching current waveform that flows in FIG. 16B is a good delayed waveform in which the regenerative current flows as shown in FIG. 16B. However, in the valley portion where the power supply voltage is low, the switching current waveform becomes a waveform that is close to the same phase. There is a problem that a whisker current flows as shown in a) and switching loss increases, and there is a problem that the switching current waveform enters a phase advance mode due to fluctuations in power supply voltage and circuit variations.
[0008]
Therefore, in the present invention, even by phase control by the phase control means, the power supply voltage to the inverter circuit is made substantially constant, the switching current waveform is improved, and dimming is performed even when the phase angle is 90 ° or earlier. The present invention proposes an inverter lighting device that can be controlled and can make the dimming curve substantially constant, and is capable of dimming control by phase control.
[0009]
[Means for Solving the Problems]
  According to the present invention, in order to solve the above problem, as shown in FIG.InThe phase control means 1 including a switching element S connected in series and an adjustment device that changes the ON section of the switching element S, and a lighting device connected to the phase control means 1, Rectifying means DB and smoothing means C for smoothing the output of the rectifying means DB₀And smoothing means C₀The inverter circuit 2 is configured to include a switching element that is turned on / off at a high frequency and an LC resonance circuit, and the high frequency output by the resonance operation. In the discharge lamp lighting device for supplying power to the lamp load 3, the phase-controlled voltage from the phase control unit 1 is input to the dimming control circuit 4 as a dimming signal, and the output of the dimming control circuit 4 is received. The operation of the inverter circuit 2 is controlled so that the high-frequency power supplied to the lamp load 3 is changed.The inverter circuit 2 includes an operation control means for performing dimming control up to a phase angle of 90 ° and a phase angle of 90 ° to 180 ° with respect to the phase control by the phase control means 1. The rate of change of dimming control is switched by dimming control in the range ofIt is characterized by this.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
(Example 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 terminal of the phase control means connected to the AC power source AC. This inverter lighting device rectifies an AC power supply AC with a rectifier bridge DB, and smoothes a capacitor C₀Is input to the inverter circuit. The inverter circuit is composed of a high-frequency switching operation by turning on / off the switching element, a choke, a capacitor, etc. in the inverter circuit. The resonance circuit performs a resonance operation, supplies the high-frequency power to a load (lamp), and turns on the lamp at a high frequency. From the input side of the rectifier circuit DB of this inverter lighting device, a diode D₁, D₂Detects the output voltage of the phase control means as a pulsating DC voltage and inputs it to the dimming control circuit, receives the output voltage from the phase control means and inputs the signal voltage for dimming control to the inverter circuit is doing. It is a feature of the present invention that output control of the inverter circuit is performed according to the signal voltage.
[0011]
A specific circuit configuration example of this embodiment is shown in FIG. The inverter circuit is the same circuit system as the inverter circuit of FIG. The switching frequency of this circuit is the resistance R connected to the second and third terminals of the driver IC 2155._Four, Capacitor C₂Determined by. In the embodiment circuit of FIG.₂In parallel with the switching element Q_ThreeCapacitor C through_ThreeBy switching the charging time constant, the switching element Q₁, Q₂Is a method of performing dimming control by switching the operating frequency.
[0012]
The dimming control circuit includes a comparator CP and its reference voltage E.₀And detection resistor R₁, R₂And a detection diode D₁, D₂The phase-controlled pulsating power supply voltage is detected and the resistance R₁, R₂Divided by the detection voltage E₁It is said. The detection voltage E₁And reference voltage E₀In comparison with₁Is the reference voltage E₀When the value exceeds, the output of the comparator CP becomes High level. In that case, switching element Q made of MOSFET_ThreeIs on, the operating frequency of the driver IC (IR2155) is the resistance R_Four, Capacitor (C₂+ C_Three) Frequency f₂It becomes. Also, the detection voltage E₁Is the reference voltage E₀Since the output of the comparator CP is at a low level in the lower interval, the switching element Q_ThreeIs turned off, and the operating frequency of the driver IC (IR2155) is the resistance R_Four, Capacitor C₂The frequency f determined by₁It becomes. Frequency f₁, F₂The relationship is f₂> F₁It is represented by
[0013]
Phase-controlled detection voltage E₁FIG. 3 shows the relationship between the lamp current Ila and the lamp current Ila. Detection voltage E₁Changes as shown in the figure by the control of the phase control means.₀Is set to a low voltage, the output of the comparator CP becomes High level at the moment when the power supply voltage rises, so that the operating frequency of the inverter circuit is f as described above.₂Thus, the output increases. On the contrary, in the period when there is no AC power supply voltage, that is, in the section where the thyristor S inside the phase control means is off, the inverter circuit operates at the operating frequency f.₁The output decreases. The power supply of the inverter circuit at this time is a capacitor C₀Supplied from From FIG. 3, the frequency f₁In the section operating at, the peak value Iop of the lamp current Ila is low and the frequency f₂It can be seen that the peak value Iop of the lamp current is high in the section operating at.
[0014]
These two frequencies f₁, F₂Is determined by a section in which the thyristor S provided in the phase control means is turned on / off. f₂Is a section where the output of the inverter circuit is decreasing (operating frequency f).₁Therefore, the output of the inverter circuit operates in an increasing direction, and conversely, the operating frequency f₁Is the operating frequency f₂If the interval becomes wider, the output of the inverter circuit operates to decrease. In this way, by changing the ON section of the thyristor S of the phase control means, the two operating frequencies f of the inverter circuit₁, F₂Is changed so that the light output of the lamp is changed to two operating frequencies f.₁, F₂It is possible to change within the range.
[0015]
In this embodiment, the power supply voltage supplied to the inverter circuit is the smoothing capacitor C₀Is approximately constant voltage V as shown in FIG._C0Thus, the phase angle of the phase control means is constant up to 90 °, and in the range of 90 ° to 180 °, the power supply voltage waveform decreases according to the peak value of the power supply voltage. Therefore, the dimming control operation in this example enables dimming control by both the output reduction due to the power supply voltage reduction and the output reduction due to the operating frequency in the range of 90 ° to 180 °.
[0016]
(Example 2)
FIG. 4 shows a second embodiment. This circuit includes a boost chopper circuit and a filter circuit (inductor L) in the basic circuit configuration of FIG.₀And capacitor C₁). The specific circuit configuration is shown in FIG. In this embodiment, since the power supply circuit is constituted by the boost chopper circuit, the power supply voltage V supplied to the inverter is_C0'Is a boosted voltage. Compared with the first embodiment of FIG. 2, the output drop when the power supply phase angle falls within the range of 90 ° to 180 ° is somewhat constant due to the chopper operation. In addition, as shown in FIG. 7, there is an effect that the harmonic component of the input current can be reduced.
[0017]
(Example 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 reducing the rest period of the discharge lamp when the load is a discharge lamp. In order to smoothly perform dimming control by phase control, a boost chopper circuit is used.
[0018]
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 a relatively small capacitor. C₀The boosted pulsating DC voltage V_C0Is supplied to the inverter circuit.
[0019]
The function of the boost chopper circuit of this embodiment will be described with reference to FIG. When the pulsating DC voltage supplied to the inverter circuit is not boosted, V in FIG._AThe envelope of the output voltage waveform of the inverter circuit at that time is the waveform of A in FIG. In this case, since the phase angle when the peak value of the output voltage of the inverter circuit reaches the ignition voltage of the lamp is θa, the period t until the phase angle reaches θa₂Then, since the lamp voltage higher than the ignition voltage is not supplied to the lamp, the discharge lamp serving as the load of the inverter circuit does not light up. That is, t between the phase angle 0 and θa₂During this period, a pause period occurs in the light output. In the present invention, since the power supply voltage to the inverter circuit is boosted by the boost chopper circuit, the pulsating DC voltage is V in FIG._BThe waveform is V and the boost chopper circuit is not added._AThe peak value is higher than in the case of the waveform. As a result, the output voltage of the inverter circuit also has a waveform like B in FIG. 9B, and the phase angle θb reaching the lamp ignition voltage is smaller than the phase angle θa. Therefore, the lamp can be lit at the phase angle θb, and the light output pause period is t₁And the pause interval t when no boost chopper circuit is added₂Can be shortened. As described above, in this embodiment, since the ignition section of the discharge lamp is widened, there is an effect that the dimming control range by the phase control means can be widened as compared with the case where the step-up chopper circuit is not added.
[0020]
(Example 4)
FIG. 10 shows a fourth embodiment. This embodiment has a circuit configuration in which the dimming control circuit of the first embodiment of FIG. 2 is added to the circuit of the third embodiment shown in FIG. 8, and a wide phase angle is obtained by adding a step-up chopper circuit. 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 controlling the operating frequency of the inverter circuit. By performing the control, it is possible to widen the adjustment range of the light output control as compared with the case where the dimming control is performed only by the phase control of the power supply voltage.
[0021]
(Example 5)
A fifth embodiment of the present invention is shown in FIG. In the figure, 1 is a phase control means, 2 is an inverter circuit, 3 is a lamp, 4 is a dimming control circuit, 7 is an input voltage detection circuit, and 8 is a control power supply circuit. In this embodiment, the dimming control of the inverter circuit 2 with respect to the phase angle of the phase control means 1 is performed using the electrolytic capacitor C.₀Electrolytic capacitor C up to a phase angle of 90 ° where the charging voltage is almost constant₀The charging voltage is switched between 90 ° and 180 ° in which the charging voltage decreases as the phase angle increases. Specifically, the switching element Q₁, Q₂The operation frequency control is changed as shown in FIG. As a result, the rate of change of the light control curve is made substantially constant at all phase angles.
[0022]
The circuit of FIG. 17 includes an input voltage detection circuit 7 similar to the circuit of FIG. That is, the phase-controlled input voltage is converted to the diode D₁, D₂Rectified by resistance R₁, R₂Voltage E divided by₁Is applied to the negative input terminal of the comparator CP, and the reference voltage E is applied to the positive input terminal of the comparator CP.₀And output voltage E having a duty according to the phase angle₂Is generated. Input voltage E of comparator CP₀, E₁, And output voltage E₂Is as shown in FIG. Where the reference voltage E₀Is set to a low voltage, the output voltage E₂Becomes a high level at the moment when the power supply voltage rises, and becomes a low level when the power supply voltage drops to almost 0V.₂T of the output waveform of₁By measuring this time, the phase angle of the phase control means can be detected. Here, this output voltage E₂Is input to the control circuit IC3 using a microcomputer or the like, and the fixed period T and variable period t in FIG.₁The phase angle is detected by counting.
[0023]
First, the frequency (50 Hz or 60 Hz) of the commercial power source is determined by counting the fixed time T when the power is turned on, and the variable period t₁Is set to perform inverter control according to the commercial power frequency. The inverter circuit is connected to the switching element Q via the transformer Tf by the output of the control circuit IC3.₁, Q₂Are alternately turned on / off to supply high-frequency power to the lamp load, and the circuit operation is the same as in FIG. The frequency of the output of the control circuit IC3 is set to the variable period t in FIG.₁Is changed according to the switching element Q of the inverter circuit.₁, Q₂The output frequency of the inverter circuit is changed with respect to the phase control signal. Thereby, output control of the inverter circuit according to the phase control signal becomes possible.
[0024]
In this embodiment, by setting the change of 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 value increases, the output of the inverter circuit operates in a decreasing direction. In addition, 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 the output of the inverter circuit decreases. Operate. With the above operation, the rate of change of the dimming curve can be made substantially constant over the entire phase range of the phase angle of the phase control means.
[0025]
In the example of FIG. 19A, the frequency is constant in the phase angle range of 90 ° to 180 °, but the phase angle is 90 as shown in (1) to (3) of FIG. 19B. In the range of from 180 ° to 180 °, the frequency is lowered as the phase angle increases, or the rate of increase in frequency with respect to the increase in phase angle is lowered as shown in (4) of FIG. 19B. It is also possible to control the change rate of the dimming curve before and after the control conversion point where the phase angle is 90 ° to be 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 phase angle up to 90 °, and the light output is made constant or increased in the range of the phase angle from 90 ° to 180 °. By switching to the direction or lowering the light output while lowering the change rate of the dimming control for the range of the phase angle up to 90 °, it is combined with the change of the power supply voltage supplied to the inverter circuit The rate of change of the dimming curve as the discharge lamp lighting device is made substantially constant.
[0026]
In this embodiment, the time t which is the off section of the thyristor of the phase control means₁The phase angle is detected by counting, but the time t which is the ON section of the thyristor₂May be counted.
[0027]
(Example 6)
A sixth embodiment of the present invention is shown in FIG. In this embodiment, as in the fifth embodiment, the phase-controlled input voltage is rectified and divided, and the voltage E is supplied to the comparator CP.₁As the reference voltage E₀Output voltage E obtained in comparison with₂Is input to the control circuit IC3. The control circuit IC3 is constituted by a microcomputer, and the inverter circuit is switched by the output of the control circuit IC3 via the transformer Tf.₁Is a so-called monolithic inverter that supplies high frequency power to the lamp load.
[0028]
In the present embodiment, the control circuit IC3 of the inverter circuit has an output voltage E of the comparator CP.₂Time t₁, T₂Are counted, and “t” shown in FIG. 18 is displayed inside the control circuit IC3.₂-T₁”And the switching duty ratio of the inverter circuit is set in advance as shown in FIG. 21 with respect to the absolute value. Thereby, the switching duty ratio of the inverter circuit is controlled in accordance with the change of the phase angle. Therefore, until the phase angle reaches 90 °, the duty ratio of the inverter operating frequency gradually decreases as the phase angle increases. Therefore, the output of the inverter circuit operates in a decreasing direction, and the phase angle increases from 90 ° to 90 °. In the range of 180 °, the duty ratio of the operating frequency of the inverter circuit gradually increases as the phase angle increases, so that the output of the inverter circuit operates so as to decrease only by reducing the power supply voltage of the inverter circuit. Thus, similarly to the fifth embodiment, control can be performed so that the rate of change of the light control curve is substantially constant over the entire phase angle range.
[0029]
  (Example 7)
  The operation of the seventh embodiment of the present invention is shown in FIG. FIG. 22 shows a comparative example for this embodiment.1The operation of is shown. The circuit configuration of this embodiment is the same as that shown in 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) when starting the lamp. The present invention proposes an inverter lighting device in which hysteresis does not occur in lighting characteristics with respect to a phase angle.
[0030]
As described above, when the phase angle of the phase control unit is 90 ° 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 decreases in the inverter circuit, the lamp voltage applied to the lamp load cannot be secured, and the lamp goes off. In addition, there is a problem that the lamp cannot be started when the power supply voltage is lower than a predetermined value. When the phase control means is turned off (phase angle 180 °) and the phase angle is decreased, the original dimming level is minimized. Since it cannot be started at the value (Min) and is started when the phase angle is changed to a shallower dimming level, hysteresis occurs in the dimming characteristics with respect to the phase angle as shown in FIG. Therefore, even if you want to turn on the dimming level at the minimum value (Min) when starting the lamp, adjust the volume of the phase control means to a level that satisfies the startable power supply voltage and then lower the dimming level. In addition, if the lamp is turned off accidentally when adjusting the volume to a deep dimming level, the dimming level must be raised again to a shallow area for adjustment, making it particularly difficult to set a deep dimming level. It is.
[0031]
Therefore, in this embodiment, as shown in FIG. 23, in the region where the input voltage of the inverter circuit decreases due to the phase control by the phase control means, the power supply voltage Vdco necessary for the inverter circuit to start the lamp is set. On the other hand, the minimum value (Min) of the light control level is set to a phase angle at which the power supply voltage Vdc is equal to or higher than Vdco. That is, the phase angle by the phase control means when the input voltage of the inverter circuit is Vdco is x₀When the phase angle is set to Min of the dimming level by dimming control
x₁≦ x₀
The phase angle x₁Thus, even if the dimming level is the minimum value (Min), the power supply voltage equal to or higher than Vdco is reliably supplied to the inverter circuit.
[0032]
Therefore, in the entire light control level section, the light output can be controlled smoothly from the maximum value (Max) to the minimum value (Min) and turned off and vice versa. Since the power supply voltage leading to the extinction of the lamp is lower than Vdco, the extinction due to the power supply voltage shortage of the inverter circuit is also eliminated, and the maximum value (Max), minimum value (Min), and extinction of the dimming level within the dimming control range. Can be controlled.
[0033]
Examples of the present inventionComparative Example 2 for 7This control is shown in FIG. BookComparative Example 2The circuit configuration is the same as FIG. FIG. 24 is a graph of the light control level with respect to the phase angle, in which the minimum value (Min) of the light control level is set up to the phase angle of 90 °. That is, the phase angle x at which the dimming level is the minimum value (Min)₂X₂≦ 90 °. BookComparative Example 2In this control, the total dimming level can be controlled in 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.
[0034]
The input current waveform of the capacitor input type circuit configuration as shown in FIG. 17 flows in the vicinity of the peak value of the pulsating voltage as shown in FIG. Therefore, when obtaining the same output voltage, even if the input voltage is phase-controlled, if the phase angle is 90 ° or less and the phase angle is small, the input current waveform is hardly affected as shown in FIG. If the angle exceeds 90 °, the input voltage value when the input current flows as shown in FIG. 27 is low, and the peak value of the input current becomes high. Therefore, by setting the minimum value (Min) of the dimming level up to the phase angle of 90 °, the peak value of the input current can be kept low in addition to the effect of the seventh embodiment.
[0035]
  (Example8)
  Examples of the present invention8A circuit diagram of this is shown in FIG. Example 7 or aboveComparative Example 2Then, control is performed only within a certain range with respect to all phase angles that can be controlled by the phase control means, in reality, all angles such as volume. Although there is no problem as a control characteristic, the volume operation in the region where the phase angle is increased by the phase control does not relate to the output adjustment at all, and the operation problem remains that the light is already turned off. Therefore, this embodiment proposes an inverter lighting device capable of dimming control over all phase angles that can be controlled by the phase control means.
[0036]
In the circuit of FIG. 28, the phase control means is connected in parallel to the AC power supply AC, the output is rectified by the diode bridge DB, the step-up chopper circuit that characterizes the present invention is connected, and the output is connected to the capacitor C.₀The boosted DC voltage is supplied to the inverter circuit. With this configuration, the power supply voltage of the inverter circuit is constant over a wide range of phase angles, as shown in FIG. 29, so that the controllable range by the dimming control is greatly expanded, and the conditions of the stable power supply voltage are satisfied. Dimming control can be performed at
[0037]
【The invention's effect】
According to the present invention, when the power supply voltage of the inverter circuit is smoothed in the lighting device that controls the lamp load by connecting the phase control means to the power supply of the inverter lighting device, the power supply phase angle is 0 ° to 90 °. Also in this section, the voltage of the phase control means is detected and input to the inverter circuit as a dimming signal by the dimming control circuit, thereby providing an effect that continuous dimming control is possible. Furthermore, by adding the step-up chopper circuit to the power supply smoothing circuit, the effect of reducing the phase input current harmonic distortion and suppressing the power supply drop in the section where the phase angle is 90 ° to 180 ° can be suppressed by the chopper control. have. In addition, it is directly connected to a device with phase control that is often used for incandescent lamps, and even when the power supply of the inverter circuit is substantially constant and smooth, dimming lighting from a phase angle of 0 ° is possible. Have.
[0038]
According to the invention of claim 4, in the inverter lighting device by the non-smooth power source that does not smooth the AC pulsating current voltage, the boost chopper means is connected to the power circuit, thereby having the effect of the inverter circuit by the pulsating DC voltage. However, it is possible to shorten the rest period during which the discharge lamp serving as the load is ignited, and the light control by the phase control means can be performed in a wide section. In addition, the dimming control circuit that detects the output voltage of the phase control means inputs it as a dimming signal to the inverter circuit, and the phase control of the power supply voltage is controlled by the two controls of the power supply voltage and the dimming signal. The dimming control can be performed more smoothly and linearly than the dimming control according to.
[0039]
  Claims 8 to10According to the invention, the change rate of the dimming signal with the phase angle of 90 ° to 180 ° is decreased with respect to the change rate of the dimming signal with the phase angle of up to 90 °. The change rate of the dimming curve can be made substantially constant over the entire phase range of the corners.
[0040]
  Claim11According to the invention, with respect to the phase control from the phase control means, the phase angle at which the dimming level is minimized is set to a phase angle at which the power supply voltage of the inverter circuit is equal to or greater than the voltage necessary for starting the lamp. By doing so, it is possible to perform control in which the light output is reduced from maximum to minimum and extinguishes in all the dimming level sections, and smooth dimming control without hysteresis etc. in the reverse control, and the inverter The extinction due to insufficient power supply voltage of the circuit is also eliminated, and it is possible to control the dimming level from maximum to minimum and extinguishing within the dimming control range..
[0041]
  Claim12According to the invention, even if a phase-controlled voltage is input from the phase control means, a constant power supply voltage is always supplied to the inverter circuit via the boost chopper, so that stable dimming control is possible. Furthermore, the light output can be adjusted within a wide section of the phase control, and the light output is decreased from the maximum to the minimum and turned off in the entire dimming level section, and vice versa. Therefore, smooth dimming control without hysteresis or the like is possible, and disappearance due to insufficient power supply voltage of the inverter circuit is eliminated.
[Brief description of the drawings]
FIG. 1 is a block circuit diagram showing a basic configuration of Embodiment 1 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 diagram for explaining the operation of the first embodiment of the present invention.
FIG. 4 is a block circuit diagram showing a basic configuration of Embodiment 2 of the present invention.
FIG. 5 is a waveform diagram of an inverter power supply voltage according to the second embodiment of the present invention.
FIG. 6 is a circuit diagram showing a specific configuration of Embodiment 2 of the present invention.
FIG. 7 is a waveform diagram showing an input current and a load current in Example 2 of the present invention.
FIG. 8 is a block circuit diagram showing a basic configuration of Embodiment 3 of the present invention.
FIG. 9 is a waveform diagram for explaining the operation of the third embodiment of the present invention.
FIG. 10 is a block circuit diagram showing a basic configuration of Embodiment 4 of the present invention.
FIG. 11 is a circuit diagram of Conventional Example 1;
12 is a circuit diagram of Conventional Example 2. FIG.
13 is an operation explanatory diagram of Conventional Example 1. FIG.
14 is an operation explanatory diagram of Conventional Example 2. FIG.
FIG. 15 is a circuit diagram of Conventional Example 3;
16 is an operation explanatory diagram of Conventional Example 3. FIG.
FIG. 17 is a circuit diagram of Embodiment 5 of the present invention.
FIG. 18 is a waveform diagram for explaining the operation of the fifth embodiment of the present invention.
FIG. 19 is an explanatory diagram showing control characteristics of Example 5 of the present invention.
FIG. 20 is a circuit diagram of Embodiment 6 of the present invention.
FIG. 21 is an explanatory diagram showing control characteristics of Example 6 of the present invention.
FIG. 22 is a comparative example with respect to Example 7 of the present invention.1It is explanatory drawing which shows the control characteristic.
FIG. 23 is an explanatory diagram showing control characteristics of Example 7 of the present invention.
FIG. 24 shows an example of the present invention.Comparative Example 2 for 7It is explanatory drawing which shows the control characteristic.
FIG. 25 shows an example of the present invention.Comparative Example 2 for 7It is a wave form diagram which shows operation | movement when not performing phase control.
FIG. 26 shows an example of the present invention.Comparative Example 2 for 7It is a wave form diagram which shows operation | movement when the phase angle of is small.
FIG. 27 shows an example of the present invention.Comparative Example 2 for 7It is a wave form diagram which shows operation | movement when the phase angle of is large.
FIG. 28 shows an example of the present invention.8FIG.
FIG. 29 shows an example of the present invention.8It is explanatory drawing which shows the control characteristic.
[Explanation of symbols]
  1 Phase control means
  2 Inverter circuit
  3 lamps
  4 Dimming control circuit

Claims (12)

A phase control means including a switching element connected in series to an AC power source and an adjustment device for changing an ON section of the switching element; and a lighting device connected to the phase control means, the lighting device being a rectifier Means, a smoothing means for smoothing the output of the rectifying means, and an inverter circuit that receives the output of the smoothing means and supplies a high-frequency output to the lamp load, the inverter circuit being a switching element that is turned on / off at a high frequency, In a discharge lamp lighting device that is configured with an LC resonance circuit and supplies high-frequency power to a lamp load by its resonance operation, the phase-controlled voltage from the phase control means is input to the dimming control circuit as a dimming signal, to control the operation of the inverter circuit so as to change the high frequency power supplied to the lamp load in response to an output of the dimming control circuit The operation control means is provided in the inverter circuit, and the operation control means is a dimming control up to a phase angle of 90 ° and a phase angle in the range of 90 ° to 180 ° with respect to the phase control by the phase control means. A discharge lamp lighting device characterized by switching a change rate of dimming control with dimming control .   The dimming control circuit includes a rectifying element that rectifies the output voltage of the phase control means, and a discrimination circuit that compares a detection voltage obtained by the rectifying element with a reference voltage, and dimming the output voltage of the discrimination circuit The discharge lamp lighting device according to claim 1, wherein the discharge lamp lighting device is configured to be input to the inverter circuit as a signal.   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, and the switching means outputs an output voltage of the discriminating circuit. The discharge lamp lighting device according to claim 2, wherein the switching operation is performed at a ratio corresponding to the phase of the phase-controlled voltage from the phase control means.   The smoothing means includes a step-up chopper circuit, a capacitor is connected to the output of the step-up chopper circuit, and a voltage across the capacitor is a pulsating DC voltage higher than a pulsating DC voltage obtained by rectifying the AC power supply voltage The discharge lamp lighting device according to claim 1.     2. The discharge lamp lighting device according to claim 1, wherein the inverter circuit includes operation control means for changing dimming control in accordance with a phase of the pulsating current voltage subjected to phase control from the phase control means.     6. The discharge lamp lighting device according to claim 5, wherein the dimming control in the operation control means includes control for changing a frequency for turning on / off a switching element of the inverter circuit.     6. The discharge lamp lighting device according to claim 5, wherein the dimming control in the operation control means includes control for changing a duty ratio for turning on / off a switching element of the inverter circuit. In the dimming control by the operation control means, the light output of the lamp load is controlled to decrease until the phase angle is 90 °, and the dimming control is controlled to be constant in the range of the phase angle from 90 ° to 180 °. The discharge lamp lighting device according to claim 1 . In the dimming control by the operation control means, the light output of the lamp load is controlled to decrease in the phase angle up to 90 °, and the light output is controlled in the direction in which the phase angle is in the range of 90 ° to 180 °. The discharge lamp lighting device according to claim 1 . The dimming control by the operation control means controls the light output of the lamp load to decrease as the phase angle increases. In the phase angle range of 90 ° to 180 °, the phase angle is up to 90 °. the discharge lamp lighting device according to claim 1, wherein the lower the rate of change of the dimmer control.     In the operation control means of the inverter circuit, the phase angle at the dimming lower limit is an oscillation output that allows the power supply voltage of the inverter circuit to start and light the lamp load by supplying a phase-controlled voltage from the phase control means The discharge lamp lighting device according to claim 1, wherein the voltage is set to be equal to or smaller than a phase angle at which a voltage can be obtained.     5. 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 the range of 90 ° to 180 °.

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