JP4036003B2 - Phase control device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a phase control device that performs light control by controlling the phase of power supplied to a lighting load.
[0002]
[Prior art]
As a conventional lighting lighting device, there has been a device that varies the lighting power of an incandescent lamp by phase control in order to obtain a production effect or save energy.
[0003]
For such an illumination lighting device, a general phase control device as shown in FIG. 11 is used. This conventional phase control device has a two-terminal structure for connecting a series circuit of a commercial AC power source (hereinafter referred to as AC power source) AC and an incandescent lamp LA, and is connected in parallel to the series circuit via a reactance L. The time constant circuit connected between both ends of the triac Q1 and the capacitor C1, which is composed of a series circuit of a bidirectional three-terminal thyristor (hereinafter referred to as triac) Q1, a resistor R1, a variable resistor R2, and a capacitor C1, is variable. A diac Q2 connected between a connection point of the resistor R2 and a gate terminal as a control end of the triac Q1, a constant voltage diode connected between both ends of the series circuit of the variable resistor R2 and the capacitor C1, and regulating the voltage at both ends constant. It is comprised with the trigger circuit T which consists of a reverse series circuit of ZD1 and ZD2.
[0004]
In this circuit, when the voltage of the capacitor C1 charged through the resistor R1 and the variable resistor R2 reaches the breakover voltage of the diac Q2, the diac Q2 conducts and discharges the charge of the capacitor C1 as the gate current i of the triac Q1, The track Q1 is ignited.
[0005]
By the way, in these phase control devices, the load current of the incandescent lamp LA that is a load is directly ignited by the triac Q1, and therefore the load current shows a very steep rise when the phase angle of the AC power supply AC is around 90 degrees. And since di / dt at the time of ignition is large, high frequency noise is generated (150 KHz to 30 MHz). Further, in the incandescent lamp LA that is a load, the filament vibrates due to the influence of a steep load current to generate acoustic noise.
[0006]
As a countermeasure, in a general phase control device, as shown in FIGS. 11 and 12, a capacitor C2 is provided between the series circuit of the incandescent lamp LA and the AC power supply AC, and a reactance is applied to the series circuit of the incandescent lamp LA and the AC power supply AC. By connecting the triac Q1 via L, the rise of the load current is moderated by the L component to reduce noise generation.
[0007]
By the way, in the conventional circuit, in order to reduce the noise level to a level satisfying a standard value such as the IEC standard, a very large reactance L is required, so that the phase control device main body becomes very large. There is also a problem that acoustic noise is generated or heat is generated from the reactance L itself. This is particularly remarkable in a phase control device having a large load capacity.
[0008]
As a solution to the above problem, recently, a circuit configuration using a self-extinguishing switch element such as a MOSFET, IGBT, or power transistor instead of a triac or reverse blocking three-terminal thyristor (hereinafter referred to as a thyristor) as a phase control element. Are proposed as shown in Japanese Patent No. 2507848 and Japanese Patent No. 2920771.
[0009]
In the former circuit configuration, the generation of noise is reduced by controlling the signal to the control end of the switch element at a predetermined phase control angle and switching it gently. In the latter circuit configuration, RPC (Reverse Phase Control System) is adopted, and the switch element is made to conduct at the zero cross of the AC power supply voltage, and is gently cut off at the set phase angle so as to reduce noise generation. It has become.
[0010]
However, as a problem common to both, the on-resistance of a switching element such as IGBT or MOSFET is larger than that of the triac, so that it is necessary to enlarge the heat dissipation structure, resulting in a problem that the phase control device is enlarged. . On the other hand, in order to obtain an equivalent on-resistance, there is a disadvantage that the switch element itself needs to be large and becomes very expensive as the size is increased.
[0011]
In order to solve the above problems, a phase control technique in which the MOSFET or the like and a triac (or thyristor) are combined has been proposed. This technology is a soft switching method in which, for example, the IGBT or MOSFET is linearly operated by the control circuit before the triac is ignited, and then the triac is ignited and the time when the IGBT or MOSFET is turned on is shortened. Therefore, the generation of noise can be reduced without using a large and expensive switch element. Moreover, since the reactance L is unnecessary, heat generation and acoustic noise can be prevented.
[0012]
The present inventors have proposed time-division control of phase control for further development of such technology to achieve both noise reduction and heat generation prevention.
[0013]
[Problems to be solved by the invention]
  However, the above noise reduction andAndIn recent years, in addition to incandescent lamps, in addition to incandescent lamps and ballasts for lighting them (such as step-down transformers and electronic devices made of copper iron) There are lighting loads combined with a step-down transformer), dimmable bulb-type fluorescent lamp loads, etc., and when these lighting loads are controlled by a general phase control device, flickering, turning off, A lighting problem occurs.
[0014]
First, in the case of an illumination load composed of a step-down transformer and a low-pressure halogen lamp, or a ballast-type fluorescent lamp load, the ballast itself has an inductive component (L) and a capacitive component (C). Therefore, a vibration waveform is generated when the thyristor or triac is ignited by the inductance value or the capacitance value and the noise reduction reactance or capacitor built in the phase control device, and is superimposed on the main current of the lighting load. In this case, no problem occurs when the main current is large, but when the main current is small, the load current zero-crosses due to the vibration component as shown in FIG. By the way, in a general phase control device as shown in FIG. 11, after the triac Q1 (or thyristor) is turned on, the gate current (gate pulse) i is cut as shown in FIG. 13 (b). Therefore, when the zero cross occurs and becomes lower than the holding current, it is turned off. For this reason, there is a problem that flickering occurs.
[0015]
As a normal countermeasure, as shown in FIG. 12, power is supplied to the trigger circuit T from a separate power supply circuit instead of the AC power supply AC side which is the main voltage, and a gate current (gate) is supplied from the trigger circuit T to the triac Q1 (or thyristor). By increasing the time for applying the pulse (i) as shown in FIG. 14 (b), it is possible to prevent tur-off even when the load current crosses zero as shown in FIG. 14 (a). However, according to this configuration, it is necessary to flow a gate current i of several tens of mA for a long time, and therefore, it is necessary to increase the supply capacity of the power supply circuit, which causes a problem of increasing the size of the power supply circuit. Therefore, there is a problem that a problem arises that the off-period during full lighting (maximum lighting) must be taken long in order to secure the voltage, and the brightness at the time of full lighting decreases.
[0016]
Secondly, in the case of a bulb-type fluorescent lamp load, a high voltage is required to initially start the fluorescent lamp. However, if the setting of the phase control device is set to the position of the minimum phase control angle, the fluorescent lamp There is a problem that the lamp does not light up due to insufficient voltage.
[0017]
Therefore, the phase control operation is enabled by returning to the set position after all the lights are turned on. However, this method has a problem in that when it is mainly used in a state of being set near the minimum, it cannot be turned on / off by the power switch at the set position.
[0018]
In addition, when the light amount is controlled by the external light amount, there is a problem that when the minimum phase control state is reached, the lighting device (stabilizer) of the fluorescent load is turned off without being able to maintain the re-ignition operation.
[0019]
In this case, it is necessary to turn off the power supply once and finely adjust the set value of the minimum phase control while confirming the current again, which means that the user cannot perform the phase control near the minimum.
[0020]
The present invention has been made in view of the above-described points, and the object of the present invention is to provide a noise reduction reactance or capacitor even when controlling an illumination load having an inductive component or a capacitive component. Without mounting, noise can be reduced, heat generation can be suppressed, and phase control control current can be prevented from increasing without causing malfunction, and flickering even when the load is a bulb-type fluorescent lamp It is an object of the present invention to provide a phase control device capable of performing phase control that does not occur and is comfortable for the user.
[0021]
[Means for Solving the Problems]
  In order to achieve the above object, according to the first aspect of the present invention, there is provided a first switch circuit which is inserted between an AC power source and a lighting load and is composed of a reverse blocking or bidirectional three-terminal thyristor, and a self-extinguishing switch. A second switch circuit comprising elements and connected to both ends of the first switch circuit; a controller for controlling the ignition conduction of the three-terminal thyristor and the driving of the self-extinguishing switch element;Load current detection means for detecting the current flowing through the lighting load;And an external setting means for setting the dimming level of the illumination load, and the control unit temporally starts from the phase angle corresponding to the dimming level set by the external setting means during the phase control operation. The self-extinguishing switch element is controlled and driven in units of divided sections to set a period for gently increasing the load voltage applied to the lighting load through the self-extinguishing switch element. After the terminal thyristor is turned on, phase control is performed to stop the control drive of the self-extinguishing switch element.In this case, a transient change in the lighting load is detected from the load current detected by the load current detecting means, and the period is set based on this detection.It is characterized by that.
[0022]
According to a second aspect of the present invention, in the first aspect of the invention, the illumination load is an illumination load including an inductive component, a capacitive component, or both components, and the control unit changes the load current from a transient state to a steady state during the period. It is characterized in that it is set to a period required to become.
[0024]
  Claim3In the invention of claim 1,Or 2In the invention,UpThe control unit has a function of calculating an integral value for each cycle of the load current detected by the load current detecting means, and calculating an effective power to be supplied to the lighting load from the integral value, and from the effective power, the external setting means The phase angle corresponding to the light control level set in is set.
[0025]
  Claim4In the present invention, claims 1 to3In any invention of,UpThe control unit starts the period at a phase angle at which the applied voltage of the illumination load is a low voltage at which the fluorescent lamp does not start, and determines whether or not the load current is detected by the load current detecting means, so that no load current is detected. Sometimes it is equipped with a test mode operation function that determines that the illumination load is a fluorescent lamp load including a ballast and a fluorescent lamp. When this test mode operation function determines that the load is a fluorescent lamp load, the illumination load is supplied with maximum power. After the phase control is performed with the phase angle, the phase control of the phase angle corresponding to the dimming level set by the external setting means is performed.
[0026]
  Claim5In the present invention, claims 1 to4In any invention of,UpThe controller starts the period at a phase angle where the applied voltage of the lighting load is a low voltage at which the fluorescent lamp does not start, and the lighting load is a ballast and fluorescent lamp when there is no load current detected by the load current detecting means It is equipped with a test mode operation function that determines that the load is a fluorescent lamp load, and when the test mode operation function determines that it is a fluorescent lamp load, it performs phase control to sequentially increase the phase angle of phase control start to the illumination load, After the lighting of the fluorescent lamp load is confirmed by the load current detection, the control is shifted to the phase control of the phase angle corresponding to the dimming level set by the external setting means.
[0027]
  Claim6In the present invention, claims 1 to5In any invention of,UpThe controller has a function of storing the waveform in each cycle of the load current waveform output from the load current detecting means every cycle, and determining whether or not the stored load current waveform is an abnormal waveform. In this case, the phase control is stopped.
[0028]
  Claim7In the present invention, claims 1 to6In any one of the inventions, the control unit has a function of causing a minimum dimming level that can be set by the external setting means to correspond to a phase angle at which the lighting state of the lighting load can be maintained. .
[0029]
DETAILED DESCRIPTION OF THE INVENTION
  Hereinafter, the present inventionBasic form andThe embodiment will be described.
  (Basicformstate)
  FIG. 1 illustrates the present invention.BasicThe circuit configuration of the form is shown and thisBasicThe form circuit is a diode bridge circuit 1 in which a first switch circuit composed of a triac Q1 is connected to a series circuit of an AC power supply AC and a lighting load LO, and an AC power supply input terminal is connected between both ends of the triac Q1. A control unit 2 for controlling the triac Q1 and IGBT Q3 of the switch circuit, which is connected to a second switch circuit composed of IGBT (which may be a MOSFET) Q3, which is a self-extinguishing type switch element, and a lighting load And an external setting unit 3 that performs operation setting using the illuminance ratio of the LO as a light control level. The control unit 2 converts the rectified output voltage of the diode bridge circuit 1 into a predetermined DC voltage and outputs it, and also has a function of detecting the zero cross point of the AC power supply voltage, and supplies power from the power supply circuit 21. And a drive control circuit 22 that receives the zero-cross detection signal and performs phase control of the triac Q1 and IGBT Q3. The drive control circuit 22 is constituted by a CPU or the like, and before the triac Q1 is turned on. A period for driving and controlling the IGBT Q3 is provided, and this period is divided into a plurality of times to control the control signal voltage applied to the gate terminal of the IGBT Q3 (hereinafter referred to as time division control), and the voltage across the illumination load LO is set to A gently rising period T1 is set as shown in FIG.
[0030]
More specifically, the drive control circuit 22 obtains a conduction phase angle corresponding to the dimming level set by the external setting unit 3, starts driving the IGBT Q3 according to this phase angle, and switches the IGBT Q3 to a saturated state. After that, the triac Q1 is ignited to establish a conduction period T2. In this case, the IGBT Q3 is turned off after the triac Q1 is turned on, and the triac Q1 is turned off when the flowing current becomes lower than the holding current near the zero cross point of the AC power supply voltage.
[0031]
The above operation is thereafter repeated for each half cycle of the AC power supply AC, and the lighting load LO is dimmed at a set dimming level.
[0032]
Here, in the drive control circuit 22, when an illumination load LO including a ballast having an inductive component and a capacitive component is connected, a period T1 during which the IGTBQ 3 is driven is controlled until the load current changes from a transient state to a steady state. Set to the period.
[0033]
  BookBasicAccording to the configuration of the embodiment, even if a ballast having an inductive component and a capacitive component is included in the lighting load LO, there is no noise reduction capacitor or reactance inside the phase control device side, so that the oscillating current is the load current. 2B can be shortened as shown in FIG. 2B, and in the period T1 until the load current reaches a steady state, the load current flows through the IGBT Q3, so the triac Q1 is turned off by zero crossing. There is essentially no malfunction, and therefore there is an advantage that it can be prevented without a control power supply circuit for continuing to supply the gate current to the triac Q1 in order to prevent malfunction. Further, since the triac Q1 having a small on-resistance is used as the main phase control element, the heat generation due to the switching loss is small.
  (Embodiment1)
  This embodiment is negative in series with IGBT Q3 as shown in FIG.loadA shunt resistor R3 for detecting a load current for detecting a current is connected in series, and a load current detection signal consisting of a voltage across the shunt resistor R3 generated during the drive control of the IGBT Q3 is supplied to the drive control circuit in the control unit 2. 22 captures the transient change state of the illumination load LO, and determines the period T1 for driving and controlling the IGBT Q3. Other configurations are the same as those in FIG.
[0034]
Thus, in the present embodiment, the transition state of the lighting load LO is detected from the vibrating load current of the drive control circuit 2, and the predetermined period T1 for switching the IGBT Q3 is determined according to the detected time, so that malfunction occurs. As described above, low noise and heat generation can be reduced within the control range.
[0035]
The load current may be detected using a magnetic detection sensor (Hall sensor) or a current transformer instead of the shunt resistor R3.
[0036]
  (Embodiment2)
  In the present embodiment, the current integrated value for each cycle of the load current detected by the shunt resistor R3 shown in FIG.Set inIt is characterized in that the drive control circuit 22 has a function of automatically performing phase control with respect to a fixed dimming level (illuminance ratio). It should be noted that the function of the drive control circuit 2 is an embodiment.1The function of the drive control circuit 2 may also be provided.
[0037]
For example, when the illumination load LO is an incandescent lamp, when it includes a ballast composed of a transformer for stepping down, such as a low-voltage halogen lamp, the waveform of the load current differs depending on the case of a dimmable bulb-type fluorescent lamp load. .
[0038]
For example, in the case of an incandescent lamp, the load current at the time of full lighting is a sine wave as shown in FIG. 4 (a), but in the case of an inverter load that includes a capacitor inside, the load current that flows by charging the capacitor. When the waveform of (b) is different and the effective current value flowing with respect to the phase angle is different from that of an incandescent lamp, and therefore the external setting unit 3 comprising a volume is configured, the operation setting position is Thus, when the type of the illumination load LO is different, the relationship of the illuminance ratio (%) to the volume manipulated variable (%) is different from that of the incandescent lamp (A) and the case of including the capacitor (B) as shown in FIG. However, in the case of the present embodiment, by calculating the effective value of the load current flowing through the illumination load LO, the operation setting position of the volume of the external setting unit 3, that is, a predetermined dimming level is obtained. Self Therefore, even if the type of the illumination load LO is different, the same as the volume setting position of the external setting unit 3 regardless of the type of the illumination load LO. There is an advantage that the relative brightness can be set.
[0039]
The circuit configuration of the present embodiment is based on FIG. 1, and the shunt resistor R3 shown in FIG. 3 is used as the load current detection element, so that the circuit configuration is not particularly shown. Further, a load current may be detected using a magnetic detection sensor (Hall sensor) or a current transformer instead of the shunt resistor R3.
[0040]
  (Embodiment3)
  By the way, when using a dimmable bulb-type fluorescent lamp load as the illumination load LO, a voltage higher than a predetermined voltage is required to turn on the fluorescent lamp at the initial start, but the setting of the external setting unit 3 of the phase control device is required. Is set to the dimming level position corresponding to the minimum phase angle, there is a problem that the fluorescence does not light.
[0041]
Therefore, in this embodiment, the circuit of FIG. 1 is provided with a shunt resistor R3 as a load current detection element for detecting the load current as shown in FIG. 3, and the operation mode of the drive control circuit 22 of the control unit 2 is set to a low voltage at the start of operation. The phase input test mode A can be set as shown in FIG. 6, and in this test mode, the drive control circuit 22 sets the above-described periods T1 and T2 and detects it by the shunt resistor R3 generated at the switching time of the IGBT Q3. Whether or not the illumination load LO is a fluorescent lamp load including a ballast is determined based on the presence or absence of the load current value.
[0042]
In other words, unlike an incandescent lamp that is a resistive load, in the case of a fluorescent lamp load, only the ballast leakage current flows and the main current does not flow in the secondary no-load state that is not lit. It is possible to automatically determine whether or not the illuminated load LO is a fluorescent lamp load including a ballast.
[0043]
If the determination result is a fluorescent lamp load, the operation shifts to operation B for conducting at the phase angle at which the maximum power is reached, and the fluorescent lamp of the illumination load LO, which is the fluorescent lamp load, is reliably started and lit. In C, the control is shifted to the phase control based on the phase angle with respect to the dimming level set from the outside.
[0044]
Thus, according to this embodiment, since the fluorescent lamp is reliably turned on and then the predetermined phase control is performed, the problem that the fluorescent lamp does not turn on can be solved. Type fluorescent lamp load can be dimmed.
[0045]
The load current may be detected using a magnetic detection sensor (Hall sensor) or a current transformer instead of the shunt resistor R3.
[0046]
  In addition, the function of the drive control circuit 2 is an embodiment1And2Function ofTheIt may be added.
  (Embodiment4)
  Embodiment above3In the test mode operation at the time of power-on, phase control is performed so that the maximum power is obtained when it is determined that the load is a fluorescent lamp. In this embodiment, as shown in FIG. When the load is determined, the phase angle is sequentially increased as shown in B1... B4 as shown in the figure to bring the fluorescent lamp of the fluorescent lamp load to start-up lighting. The operation is characterized in that the drive control circuit 22 of the control unit 2 has a function of shifting to phase control for the light control level set by the external setting unit 3 in the operation C.
[0047]
  That is, the embodiment3Then, when the lighting load LO is determined to be a fluorescent lamp load, it is controlled to start with the phase angle that is the maximum power, and then controlled with the set phase angle, so the set phase is the minimum phase angle When the power is turned on, the amount of light changes greatly, and this large change in the amount of light makes the user feel uncomfortable in the same way as when flickering occurs. In particular, when it is used for applications that require production, the change in the amount of light becomes a problem.
[0048]
On the other hand, in the present embodiment, when the power is turned on, the initial starting lighting can be performed at the minimum phase angle at which the fluorescent lamp can be started lighting, so that the change in the amount of light can be minimized, and the user can There is an advantage that no discomfort is given.
[0049]
The circuit configuration of the present embodiment is a combination of FIG. 1 and the configuration of FIG. 3, and is not particularly shown here. Further, the load current may be detected using a magnetic detection sensor (Hall sensor) or a current transformer instead of the shunt resistor R3.
[0050]
  In addition, the function of the drive control circuit 2 is an embodiment1And2Function ofTheIt may be added.
  (Embodiment5)
  The present embodiment is a combination of the circuit configuration shown in FIG. 3 based on the circuit configuration of FIG. 1, but the feature of the present embodiment is that the waveform of the load current is applied to the drive control circuit 22 of the control unit 2. Stores each half cycle and compares the reference waveform registered in advance or the waveform for each cycle to provide a function to detect the occurrence of an abnormal current waveform. When there is a function to stop phase control and an illumination load LO composed of a bulb-type fluorescent lamp is connected, after the illumination load LO is turned on as shown in FIG. When the applied voltage of the lighting load LO is turned off to become the lighting maintenance voltage (ignition voltage) or less, the drive control circuit 22 stores the phase angle corresponding to the voltage at that time. After the memorized phase angle Even if the operation amount of the volume of the external setting unit 3 for setting, so as to maintain the lighting of the lighting load LO in off non phase angle of the phase angle immediately before, has the function of controlling so that is not turned offPointThere is a feature.
[0051]
Thus, when an abnormality occurs in the illumination load LO, the state cannot be grasped on the phase control device side, and there is a risk of ignition due to heat generation. In this embodiment, as shown in FIG. For comparison of the detected load current waveform with the basic waveform in which the drive control circuit 22 is set, the difference between the waveforms on the time axis is compared, and for example, an abnormal waveform such as X in FIG. 8 is detected. Since the phase control is stopped, safety can be ensured. Also, if the lighting load LO is a bulb-type fluorescent lamp load, the fluorescent lamp will be turned off when the volume of the external setting unit 3 is operated in a direction to decrease the illuminance ratio and become the ignition voltage or less. However, in the present embodiment, the fact that the light was turned off by the first volume operation is stored, and the subsequent operation is not set to a phase angle smaller than that phase angle. As shown in FIG. 10, even if the volume is operated up to the operation amount corresponding to the above-described illuminance ratio to be turned off, comfortable phase control can be performed to ensure the minimum illuminance ratio that can be kept on.
[0052]
  The function to maintain this lighting is the aboveBasic form andEmbodiment 1 thru | or4You may have any. MaThe function of the drive control circuit 22Basic form andEmbodiment 1 thru | or4Any of these may be used.
[0053]
  By the wayBasic form andEmbodiment 1Or 2Then, although it is the structure using a triac, the structure using a thyristor may be sufficient.
[0054]
【The invention's effect】
  According to a first aspect of the present invention, there is provided a first switch circuit which is inserted between an AC power source and a lighting load and is composed of a reverse-blocking or bidirectional three-terminal thyristor and a self-extinguishing switch element. A second switch circuit connected to both ends of the circuit; and a control unit that controls ignition conduction of the three-terminal thyristor and driving of the self-extinguishing switch element, and sets the dimming level of the illumination load. External control means is provided, and during the phase control operation, the control unit sets the self-extinguishing switch element in a unit of time divided from the phase angle corresponding to the dimming level set by the external setting means. A period for gently increasing the load voltage applied to the illumination load through the self-extinguishing switch element is set through the self-extinguishing switch element, and the three-terminal thyristor is ignited through this period. Since the phase control to stop the drive control of the rear the self extinguishing type switching elements, bringing rise to moderate the load voltage by the drive of the self extinguishing type switching element is conducting beginningByThe generation of noise can be suppressed, and the self-extinguishing switch element is turned off and the load current is caused to flow by the ignition conduction of the three-terminal thyristor having a small on-resistance, so that it is possible to suppress heat generation.Moreover, load current detecting means for detecting the current flowing through the lighting load is provided, and the control unit detects a change in the transient state of the lighting load from the load current detected by the load current detecting means. Since the above period is set based on this, there are effects that noise reduction and heat generation can be reduced within a control range in which no malfunction occurs.
[0055]
The invention of claim 2 is the lighting load according to claim 1, wherein the lighting load includes an inductive component, a capacitive component, or both components, and the control unit changes the load current from a transient state to a steady state during the period. Since it is set to a period required until it becomes possible, it is possible to eliminate a malfunction in an excessive region where an oscillating current due to an inductive component or a capacitive component flows, so that the user can comfortably perform phase control.
[0057]
  Claim3The invention of claim 1Or 2In the invention of,UpThe control unit has a function of calculating an integral value for each cycle of the load current detected by the load current detecting means, and calculating an effective power to be supplied to the lighting load from the integral value, and from the effective power, the external setting means Since the phase angle corresponding to the dimming level set in is set, the dimming can be adjusted to the same relative brightness corresponding to the set dimming level of the external setting unit even if the type of illumination load is different. There is an effect.
[0058]
  Claim4The invention of claim 1 to claim 13In any invention of,UpThe control unit starts the period at a phase angle at which the applied voltage of the illumination load is a low voltage at which the fluorescent lamp does not start, and determines whether or not the load current is detected by the load current detecting means, so that no load current is detected. Sometimes it is equipped with a test mode operation function that determines that the illumination load is a fluorescent lamp load including a ballast and a fluorescent lamp. When this test mode operation function determines that the load is a fluorescent lamp load, the illumination load is supplied with maximum power. After performing phase control with the phase angle, the phase shifts to the phase control of the phase angle corresponding to the dimming level set by the external setting means, so this is automatically recognized when the lighting load is a fluorescent lamp load. Thus, it is possible to reliably control the lighting of the fluorescent lamp with the fluorescent lamp load, and to perform a predetermined phase control after the lighting, so that it is possible to provide the user with comfortable operability without the trouble of operation. There is a result.
[0059]
  Claim5The invention of claim 1 to claim 14In any invention of,UpThe controller starts the period at a phase angle where the applied voltage of the lighting load is a low voltage at which the fluorescent lamp does not start, and the lighting load is a ballast and fluorescent lamp when there is no load current detected by the load current detecting means It is equipped with a test mode operation function that determines that the load is a fluorescent lamp load, and when the test mode operation function determines that it is a fluorescent lamp load, it performs phase control to sequentially increase the phase angle of phase control start to the illumination load, After the lighting of the fluorescent lamp load is confirmed by the load current detection, the control shifts to the phase control of the phase angle corresponding to the dimming level set by the external setting means. In addition to the effect of the invention of claim 5 The phase angle for starting and lighting the fluorescent lamp load can be set to the minimum phase angle that can be lit, the change in the amount of light at the time of lighting can be minimized, and the user is not uncomfortable. That.
[0060]
  Claim6The invention of claim 1 to claim 15In any invention of,UpThe controller has a function of storing the waveform in each cycle of the load current waveform output from the load current detecting means every cycle, and determining whether or not the stored load current waveform is an abnormal waveform. When this is done, the phase control is stopped, so that there is an effect that ignition due to heat generation of the element at the time of abnormality can be prevented in advance.
[0061]
  Claim7The invention of claim 1 to claim 16In any one of the inventions, the control unit has a function of making the minimum dimming level that can be set by the external setting means correspond to the phase angle that can maintain the lighting state of the lighting load. Even if the dimming level corresponding to the phase angle at which the extinction occurs is set to be operated, the dimming level is not set below the dimming level at which the dimming does not go off, so that phase control comfortable for the user can be performed.
[Brief description of the drawings]
FIG. 1 of the present inventionBasicformStateIt is a circuit block diagram.
FIG. 2 is a waveform diagram for explaining the operation of the above.
FIG. 3 is an embodiment of the present invention.1It is a circuit block diagram of the principal part.
FIG. 4 is an embodiment of the present invention.2It is explanatory drawing of the subject which is going to solve.
FIG. 5 is an operation explanatory diagram of the above.
FIG. 6 is an embodiment of the present invention.3FIG.
FIG. 7 is an embodiment of the present invention.4FIG.
FIG. 8 is an embodiment of the present invention.5It is explanatory drawing of setting operation.
FIG. 9 is a waveform diagram for explaining the operation.
FIG. 10 is an operation explanatory diagram of the above.
FIG. 11 is a circuit configuration diagram of a conventional example.
FIG. 12 is a circuit configuration diagram of another conventional example.
FIG. 13 is a waveform diagram for explaining the problem of the conventional example.
FIG. 14 is an explanatory waveform diagram of a problem of another conventional example.
[Explanation of symbols]
  1 Diode bridge circuit
  2 Control unit
  21 Power supply circuit
  22 Drive control circuit
  3 External setting section
  LO Lighting load
  AC commercial AC power supply

Claims (7)

A first switch circuit which is inserted between an AC power source and a lighting load, and which comprises a reverse blocking or bidirectional three-terminal thyristor;
A second switch circuit comprising a self-extinguishing switch element and connected to both ends of the first switch circuit;
A control unit for controlling ignition conduction of the three-terminal thyristor and driving of the self-extinguishing switch element ;
Load current detection means for detecting the current flowing through the lighting load, and
An external setting means for setting the dimming level of the lighting load is attached.
During the phase control operation, the control unit controls and drives the self-extinguishing switch element in units of sections divided in time from the phase angle corresponding to the dimming level set by the external setting means. A period for gradually increasing the load voltage applied to the lighting load through the type switch element is set, and after this period, the three-terminal thyristor is turned on and then the control drive of the self-extinguishing type switch element is stopped. in making the phase control to,
A phase control device, characterized in that a transitional change in the lighting load is detected from a load current detected by the load current detecting means, and the period is set based on the detection .   The illumination load is an illumination load including an inductive component, a capacitive component, or both components, and the control unit sets the period required for the load current to change from a transient state to a steady state as the period. Item 2. The phase control device according to Item 1. The control unit has a function of calculating an integral value for each cycle of the load current detected by the load current detecting means and calculating an effective power to be supplied to the lighting load from the integral value. 3. The phase control apparatus according to claim 1, wherein the phase angle corresponding to the light control level set by the setting means is set . The control unit starts the period at a phase angle at which the applied voltage of the lighting load is a low voltage at which the fluorescent lamp does not start, determines whether or not the load current is detected by the load current detecting means, and detects the load current. The test mode operation function is used to determine that the lighting load is a fluorescent lamp load including a ballast and fluorescent lamp when there is no light. 4. The method according to claim 1 , wherein after the phase control is performed with the phase angle to be supplied, the phase control of the phase angle corresponding to the light control level set by the external setting means is performed. The phase control device described. The controller starts the period at a phase angle at which the applied voltage of the lighting load is a low voltage at which the fluorescent lamp does not start, and the lighting load is stabilized when there is no load current detected by the load current detecting means at that time. And a test mode operation function for judging that the load is a fluorescent lamp load including a fluorescent lamp, and when the test mode operation function judges that the load is a fluorescent lamp load, the phase control for sequentially increasing the phase angle of the phase control start to the illumination load And after the lighting of the fluorescent lamp load is confirmed by the load current detection, the phase shift to phase control corresponding to the dimming level set by the external setting means is performed. 5. The phase control device according to any one of 4. The control unit stores a waveform in each cycle of the load current waveform output from the load current detection unit, and has a function of determining whether or not the stored load current waveform is an abnormal waveform. 6. The phase control apparatus according to claim 1 , wherein the phase control is stopped when the determination is made . 7. The control unit according to claim 1, wherein the control unit has a function of making a minimum dimming level that can be set by the external setting unit correspond to a phase angle at which the lighting state of the lighting load can be maintained . Any one of the phase control apparatuses .

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