JP2003229295A - Phase control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a phase control device capable of reducing noise and restraining heat generation without using a reactance or a capacitor for noise reduction even when controlling an illumination load having inductance components or a capacitive components. <P>SOLUTION: A drive control circuit 22 is composed of a CPU or the like. A period for driving an IGBTQ3 before a triac Q1 is turned on, is set. A period T1 for slowly raising the voltage between both ends of an illumination load LO is set by dividing the period into a plurality of intervals, and controlling a control signal voltage to be impressed to a gate of the IGBTQ3 at respective intervals. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a phase control device that controls the phase of power supplied to a lighting load to perform dimming.

[0002]

2. Description of the Related Art Conventionally, there has been an illumination lighting device that varies the lighting power of an incandescent lamp by phase control in order to obtain a rendering effect or to save energy.

As 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 supply (hereinafter referred to as an AC power supply) AC and an incandescent lamp LA, and is connected in parallel to the series circuit via a reactance L. A triac Q including a bidirectional three-terminal thyristor (hereinafter referred to as a triac) Q1, a series circuit of a resistor R1, a variable resistor R2 and a capacitor C1.
1. A time constant circuit and a capacitor C connected between both ends of 1.
1 is connected between the connection point of the variable resistor R2 and the gate terminal which is the control end of the triac Q1, and is connected between both ends of the series circuit of the diac Q2, the variable resistor R2 and the capacitor C1, and regulates the voltage between both ends to a constant value. Constant voltage diode ZD
1 and a trigger circuit T composed of an anti-series circuit of ZD2.

In this circuit, the voltage of the capacitor C1 charged through the resistor R1 and the variable resistor R2 is the diac Q2.
Diak Q2 when it reaches the breakover voltage of
Are turned on to discharge the electric charge of the capacitor C1 as the gate current i of the triac Q1 to ignite the track Q1.

By the way, in these phase control devices, the load current of the incandescent lamp LA, which is a load, is directly ignited by the triac Q1. Therefore, when the phase angle of the AC power supply AC is around 90 degrees, the load current rises very sharply. Indicates.
Since the di / dt at the time of ignition is large, high frequency noise is generated (150 KHz to 30 MHz). In addition, in the incandescent lamp LA that is a load, the filament vibrates due to the influence of a steep load current, and acoustic noise is generated.

As a countermeasure, in a general phase control device, as shown in FIGS. 11 and 12, a capacitor C2 is provided between a series circuit of an incandescent lamp LA and an AC power source AC, and an incandescent lamp LA.
By connecting the triac Q1 to the series circuit of the AC power supply AC via the reactance L, the rise of the load current is moderated by the L component to reduce noise generation.

By the way, in the conventional circuit, a very large reactance L is required to reduce the noise level to a level satisfying the standard value such as the IEC standard. Therefore, the main body of the phase controller becomes very large. To do. There is also a problem that acoustic noise is generated or heat is generated from the reactance L itself. This is particularly noticeable in a phase control device with a large load capacity.

As a solution to the above problem, recently, a self-extinguishing switch element such as MOSFET, IGBT or power transistor is used as a phase control element instead of a triac or a reverse blocking three-terminal thyristor (hereinafter referred to as a thyristor). The proposed circuit configuration is proposed as disclosed in Japanese Patent No. 2507848 and Japanese Patent No. 2920771.

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 so that the signal is gently switched. In the latter circuit configuration, the RPC (reverse phase control method) is adopted, so that the switch element is made conductive at the zero cross of the AC power supply voltage and is gently cut off at the set phase angle to reduce the noise generation. Has become.

However, a problem common to both is IG
There is a problem that the ON resistance of a switching element such as BT or MOSFET is larger than that of a triac, so that the heat dissipation structure needs to be large, resulting in a large phase control device. On the other hand, there is a drawback in that the switch element itself needs to be large in size in order to obtain an equivalent on-resistance, and the size becomes extremely expensive as the size increases.

In order to solve the above problems, the above MOSFET and the like and a triac (or thyristor)
A combined phase control technique has been proposed. This technique is, for example, a soft switching method in which an IGBT or MOSFET is linearly operated by a control circuit before the triac is ignited, and then the triac is ignited and conducted, and the time during which the IGBT or MOSFET is turned on is shortened. Therefore, it is possible to reduce noise generation without using a large and expensive switch element. Further, since the reactance L is unnecessary, heat generation and acoustic noise can be prevented.

The inventors of the present invention have proposed time-division control of phase control for achieving both reduction of noise and prevention of heat generation by further developing such a technique.

[0013]

However, in addition to the reduction of noise and the reduction of heat generation as described above, in recent years, in addition to incandescent lamps, low-pressure halogen lamps have been used as lighting loads for performance or energy saving. There are lighting loads that combine a lamp and a ballast (a step-down transformer made of copper iron or an electronic step-down transformer) for lighting it, and a dimmable bulb-type fluorescent lamp load. When controlling with a general phase control device, there are problems such as flicker, turning off and turning off.

First, in the case of a lighting load consisting of a step-down transformer and a low-voltage halogen lamp, and in the case of a compact fluorescent lamp load, the ballast itself has an inductive component (L) and a capacitive component (C). Therefore, due to its inductance value and capacitance value, and the noise reduction reactance and capacitor built into the phase control device, an oscillating waveform is generated when the thyristor or TRIAC is turned on, and it is superimposed on the main current of the lighting load. . In that 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 turned off as shown in FIG. 13 (b). Therefore, if a zero cross occurs and the current falls below the holding current, it will turn off. Therefore, there is a problem that a flicker operation occurs.

As a usual measure, 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 the trigger circuit T supplies a gate to the triac Q1 (or thyristor). By making the time for applying the current (gate pulse) i longer as shown in FIG. 14B, it is possible to prevent the turn-off even when the load current crosses zero as shown in FIG. 14A. However, according to this configuration, it is necessary to flow the gate current i of several tens of mA for a long time, and therefore, it is necessary to increase the supply capability of the power supply circuit, which causes a problem of increasing the size of the power supply circuit. There is a problem in that the off period at the time of full lighting (maximum lighting) must be long in order to secure the above voltage, and the problem of a decrease in brightness during full lighting occurs.

Secondly, in the case of a compact fluorescent lamp load, a high voltage is required to initially start the fluorescent lamp.
When the setting of the phase control device is set to the position of the minimum phase control angle, there is a problem that the fluorescent lamp does not light due to insufficient voltage.

Therefore, the phase control operation is enabled by returning to the set position after all the lights are turned on. However, in this method, when the main use is in the state of being set to the minimum, the power switch turns on / off at that setting position.
There is a problem that it cannot be turned off.

Further, when the light quantity is controlled by the quantity of outside light, the lighting device (stabilizer) of the fluorescent load cannot turn on again without maintaining the re-ignition operation when the minimum phase control state is reached. is there.

In this case, it is necessary to turn off the power supply once and then finely adjust the set value of the minimum phase control while checking the current again, which means that the user cannot control the phase around the minimum.

The present invention has been made in view of the above points, and an object thereof is to provide a reactance for noise reduction even when controlling an illumination load having an inductive component and a capacitive component. It is possible to reduce noise without installing a capacitor or a capacitor, heat generation can be suppressed, malfunction can be prevented without increasing the phase control current, and the load is a compact fluorescent lamp. An object of the present invention is to provide a phase control device capable of performing phase control that is comfortable for the user without causing flickering.

[0021]

In order to achieve the above-mentioned object, in the invention of claim 1, the first invention is inserted between an AC power source and a lighting load and comprises a reverse blocking or bidirectional three-terminal thyristor. A second switch circuit comprising a switch circuit and a self-extinguishing switch element, which is connected to both ends of the first switch circuit, and a firing conduction of the 3-terminal thyristor and driving of the self-extinguishing switch element. With a control unit for controlling, an external setting means for setting the dimming level of the lighting load is additionally provided, and the control section, during the phase control operation, has a phase corresponding to the dimming level set by the external setting means. A period in which the self-arc-extinguishing switch element is controlled and driven in units of time divisions from the corner to gradually increase the load voltage applied to the lighting load through the self-extinguishing switch element. Set, through this period and performing phase control for stopping the drive control of the self-turn-off switching element after ignited conduct the three-terminal thyristor.

According to a second aspect of the present invention, in the first aspect of the present invention, the lighting load is a lighting load including an inductive component, a capacitive component, or both components, and the control section changes the load current from a transient state during the period. The feature is that it is set to a period required to reach a steady state.

According to a third aspect of the present invention, in the first or second aspect of the present invention, there is provided load current detection means for detecting a current flowing through the lighting load, and the control section detects the load current from the load current detection means. It is characterized in that a transitional change of the lighting load is detected and the period is set based on this detection.

According to a fourth aspect of the present invention, in any one of the first to third aspects of the present invention, a load current detecting means for detecting a current flowing through the lighting load is provided, and the control section detects a load detected by the load current detecting means. The integrated value is calculated for each cycle of the current and the effective power supplied to the lighting load is calculated from the integrated value. The phase corresponding to the dimming level set by the external setting means is calculated from the effective power. It is characterized by setting a corner.

According to a fifth aspect of the present invention, in any one of the first to fourth aspects of the present invention, a load current detecting means for detecting a current flowing through the lighting load is provided, and the control section applies a voltage to the lighting load to a fluorescent lamp. The start of the period at a phase angle at which the voltage does not start is low, and whether or not the load current is detected by the load current detection means is determined. When the load current is not detected, the lighting load includes a ballast and a fluorescent lamp. It is equipped with a test mode operation function that determines that it is a fluorescent load, and when this test mode operation function determines that it is a fluorescent load, after performing phase control at the phase angle that supplies the maximum power to the lighting load, It is characterized in that the phase shifts to the phase control of the phase angle corresponding to the dimming level set by the setting means.

According to a sixth aspect of the present invention, in any one of the first to fifth aspects of the present invention, a load current detecting means for detecting a current flowing through the lighting load is provided, and the control section applies a voltage to the lighting load to a fluorescent lamp. A test mode in which the lighting load is determined to be a fluorescent light load including a ballast and a fluorescent lamp when there is no load current detected by the load current detection means by starting the period with a low voltage that does not start When this test mode operation function determines that a fluorescent lamp load is present, phase control is performed to sequentially increase the phase angle of the phase control start for the lighting load, and lighting of the fluorescent lamp load is confirmed by load current detection. After that, the control shifts to the phase control of the phase angle corresponding to the dimming level set by the external setting means.

According to a seventh aspect of the present invention, in any one of the first to sixth aspects, a load current detecting means for detecting a current flowing through the lighting load is provided, and the control section outputs from the load current detecting means. The load current waveform in each cycle is stored for each cycle and a function to determine whether the stored load current waveform is an abnormal waveform is provided.When it is determined that the waveform is an abnormal waveform, the phase control can be stopped. Characterize.

According to an eighth aspect of the present invention, in any one of the first to seventh aspects, the control section can maintain the lighting state of the illumination load at the minimum dimming level that can be set by the external setting means. It is characterized in that it has a function corresponding to the phase angle.

[0029]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below with reference to embodiments. (Embodiment 1) FIG. 1 shows a circuit configuration of an embodiment of the present invention. This embodiment circuit is a first switch circuit including a triac Q1 for a series circuit of an AC power supply AC and a lighting load LO. IG, which is a self-extinguishing type switch element, through a diode bridge circuit 1 in which the AC power supply input terminals are connected between both ends of the triac Q1.
A second switch circuit composed of a BT (MOSFET may be used) Q3 is connected, and a control unit 2 for controlling the triac Q1 and the IGBT Q3 of these switch circuits and the illuminance ratio of the illumination load LO are operated and set as a dimming level. The external setting unit 3 is provided. 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 a zero-cross point of the AC power supply voltage, and a power supply circuit 21 that supplies power. And a drive control circuit 22 that receives the zero-cross detection signal and controls the phase of the triac Q1 and the IGBT Q3.
2 is composed of a CPU, etc., and is provided with a period for driving and controlling the IGBT Q3 before the triac Q1 is turned on.
The control signal voltage applied to the gate terminal of BTQ3 is controlled (hereinafter referred to as time division control), and the period T1 in which the voltage across the illumination load LO is gradually raised is set as shown in FIG. 2 (a). ing.

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 IGBTQ3 in accordance with this phase angle, and saturates the IGTBQ3. After the switching is performed, the triac Q1 is turned on and the conduction period T2 is set. In this case I
The GBT Q3 is turned off after the triac Q1 is turned on, and the triac Q1 is turned off when the flowing current becomes less than the holding current near the zero cross point of the AC power supply voltage.

The above operation is thereafter repeated for each half cycle of the AC power source AC to dim the lighting load LO at the set dimming level.

Here, in the drive control circuit 22, when a lighting load LO including a ballast having an inductive component and a capacitive component is connected, the period T1 for controlling the drive of the IGTBQ3 is changed from a transient state to a steady state in the load current. Set to the period until.

Thus, according to the configuration of this embodiment, even if the lighting load LO includes a ballast having an inductive component and a capacitive component, a noise reducing capacitor and a reactance are present inside the phase control device side. Therefore, the resonance time in which the oscillating current is superimposed on the load current can be shortened as shown in FIG. 2B, and the load current flows through the IGBT Q3 in the period T1 until the load current reaches the steady state. There is essentially no malfunction that the triac Q1 is turned off by the zero cross, and therefore, in order to prevent malfunction, it can be prevented without the power supply circuit for control for continuing to supply the gate current to the triac Q1. There is an advantage. Further, since the reactance heat generation and the triac Q1 having a small ON resistance as the main phase control element are used, the heat generation due to the switching loss is small. (Embodiment 2) In this embodiment, as shown in FIG.
A shunt resistor R3 for detecting a load current for detecting a negative current is connected in series to Q3, and an IGBTQ is connected.
The drive control circuit 22 in the control unit 2 captures a load current detection signal composed of a voltage across the shunt resistor R3 generated during drive control of the control unit 3 to detect a transient change state of the lighting load LO and drive-control the IGBT Q3. The period T1 is decided. Since the other configurations are the same as those in FIG. 1, description and description thereof will be omitted.

Thus, in the present embodiment, the drive control circuit 2 detects a transient change state of the illumination load LO from the oscillating load current and determines a predetermined period T1 for switching the IGBT Q3 in accordance with the detected time. Therefore, it is possible to reduce the above-mentioned low noise and heat generation within a control range where malfunction does not occur.

Instead of the shunt resistor R3, a magnetic detection sensor (Hall sensor) or a current transformer may be used to detect the load current.

(Embodiment 3) In this embodiment, the effective power of the load current is calculated by obtaining the current integrated value of each cycle of the load current detected by the shunt resistor R3 shown in FIG. It is characterized in that the drive control circuit 22 has a function of automatically performing phase control with respect to the set dimming level (illuminance ratio). The drive control circuit 2 may have the function of the drive control circuit 2 of the second embodiment.

For example, in the case where the lighting load LO is an incandescent lamp, when a ballast including a transformer for step-down is included like a low-voltage halogen lamp, and in the case of a dimmable bulb-type fluorescent lamp load, the waveforms of the load currents are different. Is different.

For example, in the case of an incandescent lamp, the load current at the time of full lighting becomes a sine wave as shown in FIG. 4 (a), but in the case of an inverter load including a capacitor inside, charging of the capacitor causes When the waveform of the load current that flows is as shown in (b), the effective current value that flows with respect to the phase angle is different from the case of an incandescent lamp. Therefore, if the external setting unit 3 including a volume is configured, its operation setting When the type of the illumination load LO is different with respect to the position, the relationship of the illuminance ratio (%) with respect to the volume operation amount (%) is as shown in FIG. However, in the present embodiment, by calculating the effective value of the load current flowing through the lighting load LO, the operation setting position of the volume of the external setting unit 3, in other words, a predetermined dimming level. To As described above, since the phase angle can be automatically controlled as described above, even if the type of the illumination load LO is different, the type of the illumination load LO is set to the setting position of the volume of the external setting unit 3. Regardless of this, there is an advantage that the same relative brightness can be set.

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 detecting element, so the circuit configuration is not particularly shown. Further, instead of the shunt resistor R3, a magnetic detection sensor (Hall sensor) or a current transformer may be used to detect the load current.

(Embodiment 4) When a dimmable bulb-type fluorescent lamp load is used as the illumination load LO, a voltage higher than a predetermined voltage is required to turn on the fluorescent lamp at the initial start. When the setting of the external setting unit 3 of the device is set to the dimming level position corresponding to the minimum phase angle, there is a problem that the fluorescence does not light.

Therefore, in this embodiment, the circuit of FIG. 1 is provided with a shunt resistor R3 as a load current detecting element for detecting a load current as shown in FIG. The low voltage phase injection test mode A can be set as shown in FIG. 6, and the drive control circuit 22 sets the above-described periods T1 and T2 in this test mode to generate a shunt resistance during switching of the IGBT Q3. Whether or not the lighting load LO is a fluorescent lamp load including a ballast is determined from the presence or absence of the load current value detected at R3.

That is, unlike the incandescent lamp which is a resistance load, in the case of a fluorescent lamp load, only the leakage current of the ballast flows and the main current does not flow in the secondary no-load state in which it is not lit. Lighting load LO connected by detection
It is possible to automatically determine whether or not the load is a fluorescent lamp load including a ballast.

When the result of the judgment is that the fluorescent lamp is loaded,
The operation shifts to the operation B in which the phase angle becomes the maximum power and the fluorescent lamp of the illumination load LO, which is the fluorescent lamp load, is surely started and lit, and the dimming level set from the outside in the next operation C after the start is adjusted. The phase control is shifted to the phase angle.

Thus, according to this embodiment, since the fluorescent lamp is surely turned on and then the predetermined phase control is performed, it is possible to solve the problem that the fluorescent lamp is not turned on, which is the same as the incandescent lamp. Thus, the light bulb type fluorescent lamp load can be dimmed.

Instead of the shunt resistor R3, a magnetic detection sensor (Hall sensor) or a current transformer may be used to detect the load current.

The functions of the second and third embodiments may be added as the functions of the drive control circuit 2. (Fifth Embodiment) In the fourth embodiment, the phase control that maximizes the electric power is performed when the fluorescent lamp load is determined in the test mode operation when the power is turned on. As described above, when it is determined that the fluorescent lamp is loaded in the test mode operation A, the phase angles B1 to B4 are displayed as shown in the figure.
As described above, the fluorescent lamps of the fluorescent lamp load are sequentially increased to start lighting, and when it is determined from the detection of the load current that the fluorescent lamps are lit, the dimming level set by the external setting unit 3 in the next operation C is performed. Is characterized in that the drive control circuit 22 of the control unit 2 has a function of shifting to the phase control for the.

In other words, in the fourth embodiment, when the lighting load LO is determined to be a fluorescent lamp load, the phase angle is set to the maximum power to start and light up, and then the set phase angle is used for control. When the phase is the minimum phase angle, the amount of light changes greatly when the power is turned on, and this large change in the amount of light makes the user feel uncomfortable as if flicker occurs. Especially when it is used for an application that requires performance, the change in the amount of light becomes a problem.

On the other hand, in the present embodiment, when the power is turned on, the initial start-up lighting can be performed at the minimum phase angle at which the fluorescent lamp can be started-lighted, and therefore the change in the light amount can be minimized. There is an advantage that the user does not feel uncomfortable.

The circuit configuration of this embodiment is a combination of the configuration shown in FIG. 1 and the configuration shown in FIG. Further, instead of the shunt resistor R3, a magnetic detection sensor (Hall sensor) or a current transformer may be used to detect the load current.

Further, the function of the second or third embodiment may be added as the function of the drive control circuit 2. (Embodiment 6) The present embodiment is a combination of the circuit configuration shown in FIG. 3 on the basis of the circuit configuration of FIG. 1, but the feature of this embodiment is that the drive control circuit 22 of the control unit 2 is used.
In addition, by storing the waveform of the load current for each half cycle, by comparing the reference waveform registered in advance or the waveform of each cycle, to have the function of detecting the occurrence of abnormal current waveform, When the function of stopping the phase control when an abnormal current waveform is generated and the lighting load LO consisting of a compact fluorescent lamp are connected, after the lighting load LO is turned on as shown in FIG. When the volume of No. 3 is operated in the direction of decreasing the illuminance ratio and the applied voltage of the lighting load LO is equal to or lower than the lighting maintaining voltage (firing voltage) and the light is turned off, the phase angle corresponding to the voltage at that time is driven and controlled. Even if there is a manipulated variable of the volume of the external setting unit 3 that is set by the circuit 22 and is set to be equal to or less than the stored phase angle, the lighting load LO is kept lit at a phase angle that does not go out immediately before the phase angle. , That is, erased It is characterized in that the have a function of controlling so as not to.

When an abnormality occurs in the illumination load LO, the phase control device cannot grasp the state, and there is a risk of ignition due to heat generation. The comparison of the detected load current waveform with the basic waveform set by the drive control circuit 22 is performed by comparing the difference between the front and rear waveforms on the time axis to detect an abnormal waveform such as X in FIG. If so, the phase control is stopped, so that safety can be ensured. Also, the lighting load L
When O is a light bulb type fluorescent lamp load, when the volume of the external setting unit 3 is operated in the direction of decreasing the illuminance ratio, there is a problem that the fluorescent lamp goes out due to the firing voltage or less. However, in the present embodiment, the fact that the light is turned off at the first volume operation is stored, and the subsequent operation is not set to a phase angle smaller than the phase angle, so that the subsequent users will see the operation as shown in FIG. In addition, even if the volume is operated up to the operation amount corresponding to the above-mentioned illuminance ratio to be turned off, comfortable phase control can be performed to secure the minimum illuminance ratio that can be maintained to be turned on.

The function of maintaining the lighting may be provided in any of the first to fifth embodiments. Also, the function of the drive control circuit 22 may be provided in any of the first to fifth embodiments.

By the way, in each of the first to third embodiments, the structure using the triac is used, but the structure using the thyristor may be used.

[0054]

According to the first aspect of the present invention, the first switch circuit, which is inserted between the AC power source and the lighting load, is composed of a reverse blocking or bidirectional three-terminal thyristor and a self-extinguishing type switch element. A second switch circuit connected to both ends of the first switch circuit and a control unit for controlling the firing conduction of the three-terminal thyristor and the drive of the self-extinguishing type switch element are provided, and the lighting load An external setting means for setting the dimming level is additionally provided, and during the phase control operation, the control section self-extinguishes in a unit divided in time from the phase angle corresponding to the dimming level set by the external setting means. A period during which the arc-type switch element is controlled and driven to gradually increase the load voltage applied to the lighting load through the self-extinguishing-type switch element is set, and after this period, the three-terminal thyristor is set. Since the phase control is performed to stop the control drive of the self-extinguishing switch element after the ignition is conducted, it is possible that the load voltage is gradually raised by driving the self-extinguishing switch element at the start of conduction, which causes noise. In addition, since the self-extinguishing type switch element is turned off thereafter and the load current is caused to flow by the ignition conduction of the three-terminal thyristor having a small ON resistance, there is an effect that heat generation can also be suppressed.

According to a second aspect of the present invention, in the first aspect of the present invention, the lighting load is a lighting load including an inductive component, a capacitive component, or both components, and the control section controls the period from the transient state of the load current. Since it is set to the period required to reach the steady state, it is possible to eliminate malfunctions in an excessive area where an oscillating current due to an inductive component or a capacitive component flows, and therefore, there is an effect that the user can comfortably control the phase. .

According to a third aspect of the present invention, in the first or second aspect of the present invention, a load current detecting means for detecting a current flowing through the lighting load is provided, and the control section detects the load current from the load current detecting means. Since the transitional change of the illumination load is detected and the above period is set based on this detection, there is an effect that noise reduction and heat generation can be achieved within a control range where malfunction does not occur.

According to a fourth aspect of the present invention, in any one of the first to third aspects, a load current detecting means for detecting a current flowing through the lighting load is provided, and the control section detects a load detected by the load current detecting means. The integrated value is calculated for each cycle of the current and the effective power supplied to the lighting load is calculated from the integrated value. The phase corresponding to the dimming level set by the external setting means is calculated from the effective power. Since the angle is set, there is an effect that the dimming can be performed to the same relative brightness corresponding to the dimming level set by the external setting unit even if the type of lighting load is different.

According to a fifth aspect of the present invention, in any one of the first to fourth aspects of the present invention, a load current detecting unit for detecting a current flowing through the lighting load is provided, and the control unit applies a voltage to the lighting load to a fluorescent lamp. The start of the period at a phase angle at which the voltage does not start is low, and whether or not the load current is detected by the load current detection means is determined. When the load current is not detected, the lighting load includes a ballast and a fluorescent lamp. It is equipped with a test mode operation function that determines that it is a fluorescent load, and when this test mode operation function determines that it is a fluorescent load, after performing phase control at the phase angle that supplies the maximum power to the lighting load, Since it shifts to the phase control of the phase angle corresponding to the dimming level set by the setting means, when the lighting load is a fluorescent lamp load, this is automatically recognized and the fluorescent lamp of the fluorescent lamp load is surely detected. It can be controlled to lit, yet since the predetermined phase control after lighting, there is an effect that it provides a comfortable operation by eliminating the burden on the operator to the user.

According to a sixth aspect of the present invention, in any one of the first to fifth aspects, a load current detecting means for detecting a current flowing through the lighting load is provided, and the control unit applies a voltage to the lighting load to a fluorescent lamp. A test mode in which the lighting load is determined to be a fluorescent light load including a ballast and a fluorescent lamp when there is no load current detected by the load current detection means by starting the period with a low voltage that does not start When this test mode operation function determines that a fluorescent lamp load is present, phase control is performed to sequentially increase the phase angle of the phase control start for the lighting load, and lighting of the fluorescent lamp load is confirmed by load current detection. After that, the control shifts to the phase control of the phase angle corresponding to the dimming level set by the external setting means. Therefore, in addition to the effect of the invention of claim 5, it is possible to start and turn on the fluorescent lamp load. Corner to be a minimum phase angle that can be turned, a change in the light amount at the time of lighting can be minimized, there is an effect that does not give discomfort to the user.

According to a seventh aspect of the present invention, in any one of the first to sixth aspects, a load current detecting means for detecting a current flowing through the lighting load is provided, and the control section outputs from the load current detecting means. The waveform of each load current waveform in each cycle is stored for each cycle, and the function to determine whether the stored load current waveform is an abnormal waveform is provided.When it is determined to be an abnormal waveform, the phase control is stopped. There is an effect that it is possible to prevent ignition due to heat generation of the element at the time of abnormality.

According to an eighth aspect of the present invention, in any one of the first to seventh aspects of the invention, the lighting state of the illumination load can be maintained at the minimum dimming level which the control section can set by the external setting means. Since it has a function to correspond to the phase angle, even if you set the dimming level corresponding to the phase angle where the extinction occurs in the external setting section, it will not be set below the dimming level that does not disappear. The effect is that the phase control that is comfortable for the user can be performed.

[Brief description of drawings]

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

FIG. 2 is a waveform diagram for explaining the operation of the above.

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

FIG. 4 is an explanatory diagram of a problem to be solved by a third embodiment of the present invention.

FIG. 5 is an operation explanatory diagram of the above.

FIG. 6 is a waveform diagram for explaining the operation of the fourth embodiment of the present invention.

FIG. 7 is a waveform diagram for explaining the operation of the fifth embodiment of the present invention.

FIG. 8 is an explanatory diagram of a setting operation according to the sixth embodiment of the present invention.

FIG. 9 is a waveform diagram for explaining the operation of the above.

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 circuit 22 Drive control circuit 3 External setting section LO lighting load AC commercial AC power supply

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Norihiro Murata             1048, Kadoma, Kadoma-shi, Osaka Matsushita Electric Works Co., Ltd.             Inside the company (72) Inventor Yoshinori Akinari             1048, Kadoma, Kadoma-shi, Osaka Matsushita Electric Works Co., Ltd.             Inside the company (72) Inventor Kenji Okada             1048, Kadoma, Kadoma-shi, Osaka Matsushita Electric Works Co., Ltd.             Inside the company F term (reference) 3K082 AA16 AA27 AA39 AA45 AA47                       AA54 AA55 AA79 BA22 BA32                       BA35 BA58 BD04 BD05 BD15                       BD23 BD26 BD32 BE04 CA37                 3K098 CC13 CC23 CC24 CC57 CC58                       CC60 DD18 DD32 DD42 DD44                       DD45 DD46 EE20 EE29 EE30                       FF04 FF12                 5H420 BB12 CC04 DD03 EA05 EA10                       EA20 EA39 EA48 EB01 EB05                       EB38 FF04 FF23 KK02 LL09

Claims (8)

[Claims] 1. A first switch circuit, which is inserted between an AC power supply and a lighting load and is composed of a reverse blocking or bidirectional three-terminal thyristor, and a self-extinguishing switch element. And a control unit for controlling the ignition conduction of the three-terminal thyristor and the drive of the self-extinguishing type switch element, and sets the dimming level of the lighting load. An external setting means is additionally provided, and during the phase control operation, the control section controls the self-extinguishing switch element in a unit of time division from a phase angle corresponding to the dimming level set by the external setting means. A period was set in which the load voltage applied to the lighting load was gradually increased by driving the self-extinguishing switch element, and the three-terminal thyristor was ignited and conducted after this period. A phase control device which performs phase control for stopping control drive of the self-extinguishing type switch element afterwards. 2. The lighting load is a lighting 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. The phase control device according to claim 1, wherein: 3. A load current detecting means for detecting a current flowing through the lighting load, wherein the control section detects a transitional change in the lighting load from the load current detected by the load current detecting means. The phase control device according to claim 1 or 2, wherein the period is set based on this detection. 4. A load current detection means for detecting a current flowing through the lighting load is provided, and the control section obtains an integrated value for each cycle of the load current detected by the load current detection means, and from the integrated value. 3. A function for calculating effective power supplied to the lighting load, and the phase angle corresponding to the dimming level set by the external setting means is set from the effective power. 3. The phase control device according to any one of 3 above. 5. The load current detection means for detecting a current flowing through the lighting load is provided, and the control section starts the period at a phase angle at which a voltage applied to the lighting load becomes a low voltage at which a fluorescent lamp does not start. Along with the presence or absence of the detection of the load current of the load current detection means, with a test mode operation function to determine that the lighting load is a fluorescent lamp load including a ballast and a fluorescent lamp when the load current is not detected, When this test mode operation function determines that the load is a fluorescent light, the phase angle corresponding to the dimming level set by the external setting means is controlled after performing the phase control with the phase angle that supplies the maximum power to the lighting load. 5. The phase control device according to claim 1, wherein the phase control device shifts to the phase control. 6. A load current detecting means for detecting a current flowing through the lighting load is provided, and the control section starts the period at a phase angle at which a voltage applied to the lighting load becomes a low voltage at which a fluorescent lamp does not start. , A test mode operation function for determining that the lighting load is a fluorescent lamp load including a ballast and a fluorescent lamp when there is no load current detected by the load current detection means at that time, and the fluorescent lamp load is provided by this test mode operation function. When it is determined that the lighting load is subjected to phase control to sequentially increase the phase angle of the phase control start, and after the load current detection confirms that the fluorescent lamp load is turned on, the dimming level set by the external setting means is set. The phase control device according to any one of claims 1 to 5, wherein the phase control device shifts to a phase control of the phase angle corresponding to. 7. A load current detecting means for detecting a current flowing through the lighting load is provided, and the control section stores a waveform of each load current waveform output from the load current detecting means in each cycle. 7. The phase control device according to claim 1, further comprising a function of determining whether or not the stored load current waveform is an abnormal waveform, and when the abnormal waveform is determined, the phase control is stopped. . 8. The control unit has a function of associating a minimum dimming level that can be set by the external setting means with a phase angle that can maintain a lighting state of the lighting load. Item 8. The phase control device according to any one of items 1 to 7.