JP3334006B2 - Power control device, dimming device, and lighting device using the same - Google Patents

Abstract

PURPOSE:To speedily change an output level input a changed output level without any instable operation even when the output level is greatly changed. CONSTITUTION:Concerning the power controller provided with a power supply circuit inserted between a load and a power source for controlling power to be supplied to the load by controlling ON time within a prescribed term, detecting means for directly or indirectly detecting the state of an output to the load in a prescribed cycle and control circuit for holding preceding data from a present time point to a prescribed cycle in the output data detected by this detecting means, calculating the average value, comparing it with a target value corresponding to the set output level, calculating error and controlling the operation of the power supply circuit so that this error can be zero, this device is provided with a deciding means S4 for deciding the level of the change of the target value, and data replacing means S10 for replacing all the preceding data held for the prescribed cycles with the target value when this deciding means S4 decides the change of the target value larger than a prescribed value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power control device, a dimming device, and a lighting device using the same.

[0002]

2. Description of the Related Art Generally, dimming lighting is indispensable for stage lighting and the like for the purpose of enhancing the effect of production. Here, in the case of using an incandescent lamp as the lighting load, in order to vary the power supplied to the incandescent lamp according to the dimming level,
A pair of thyristors (or one bidirectional thyristor) connected in anti-parallel on the AC power supply line for the incandescent lamp is provided. This is realized by phase control for conducting the thyristor.

When dimming is performed by such phase control, even if the dimming level is constant (= control phase angle is constant), if the voltage input to the dimmer fluctuates for some reason, the brightness changes. Inconvenience.

Therefore, in order to avoid such inconvenience, a control method has been adopted in which the output state of the incandescent lamp is monitored and the result of the monitoring is fed back so that the lighting is always at a predetermined dimming level. ing. Specifically, the output voltage of the dimmer for the incandescent lamp is detected, and a difference from a target voltage (target value) corresponding to the dimming level at that time is calculated, and the difference (error) is set to zero. Then, the firing phase angle of the thyristor is finely adjusted. More specifically, if the control is performed one by one using only the data of each half cycle of the AC voltage, the lighting state is rather unstable, so that the stability is increased. The output voltage data of the thyristor is calculated, the average value of these is calculated, the average value is compared with the target value, the error between the two is calculated, and the firing phase of the thyristor is set so that this error becomes zero. The corners are controlled.

[0005]

However, in the case of such a control method, when the dimming level is greatly changed,
Since the calculated error becomes very large and the adjustment amount of the firing phase angle of the thyristor changes greatly, there is a problem that flicker occurs and a convergence time until reaching the target value is prolonged.

In addition, the power control method is not limited to the thyristor phase control method, and the power supplied to the lighting load by providing a PWM (pulse width modulation) circuit and performing PWM control of the AC voltage according to the dimming level. There is a type that varies the power supply to the lighting load by varying the switching frequency according to the dimming level, and the like, but the situation is the same. is there.

[0007]

According to the first aspect of the present invention, there is provided a power supply circuit which is interposed between a load and a power supply, and controls an electric power supplied to the load by controlling an ON time within a predetermined period. Detecting means for directly or indirectly detecting the output state with respect to the load at a predetermined cycle, and, among output data detected by the detecting means, holding data immediately before a predetermined cycle from the present time and calculating an average value thereof And a control circuit for controlling an operation of the power supply circuit so as to calculate an error by comparing with a target value corresponding to the set output level and to reduce the error to zero. Determining means for determining the magnitude of the change in the value; and when the determining means determines that the change in the target value is equal to or greater than a predetermined value, all the immediately preceding data held for the predetermined cycle are set to the target value. It provided a data replacement means for changing.

According to the second aspect of the present invention, a variable frequency power supply circuit interposed between a load and a power supply, the switching frequency of which is controlled to control the power supplied to the load, and an output state for the load is determined. A detecting means for directly or indirectly detecting a cycle, and, among output data detected by the detecting means, an output level which is set by holding data immediately before a predetermined cycle from the present time and calculating an average value thereof; And a control circuit for controlling an operation of the frequency variable power supply circuit so as to calculate an error by comparing the target value with the target value corresponding to the target value. Determining means for determining the magnitude; and when the determining means determines that the change in the target value is equal to or greater than a predetermined value, all the data immediately before held for the predetermined cycle are set to the target value. It provided a data replacement means for changing.

According to the third aspect of the present invention, the first or second aspect is provided.
The light control device was configured such that the load described in (1) was an illumination load and the output level was a light control level.

According to a fourth aspect of the present invention, there is provided a lighting apparatus comprising: a fixture main body; a lighting load mounted on the fixture main body; and a dimming device for dimming and lighting the lighting load. did.

[0011]

According to the first aspect of the present invention, the output level,
Therefore, when the target value is largely changed, all the immediately preceding data held for a predetermined cycle is replaced by the target value by the data replacing means under the judgment by the judging means, so that there is no error in the control circuit. Since it is considered equivalent, the control of the on-time to make the error zero is not performed, and the operation control is directly performed toward the target value.
Therefore, the state immediately shifts to the desired output level state without the unstable operation.

In the second aspect of the present invention, when the target value is greatly changed, all immediately preceding data held for a predetermined cycle is replaced with the target value by the data replacing means under the judgment by the judging means. Therefore, the control circuit assumes that there is no error in the control circuit, so that the control of the switching frequency for making the error zero is not performed, and the operation control is directly performed toward the target value. Therefore, the state immediately shifts to the desired output level state without the unstable operation.

Therefore, in the dimming device according to the third aspect of the present invention, these loads are used as illumination loads, and even if the dimming level is largely changed, the lighting is quickly turned to a desired dimming level without flicker. Will be transferred to.

According to the fourth aspect of the present invention, since such a light control device is used, it is possible to provide a lighting device capable of performing a large change in light control level without any trouble.

[0015]

An embodiment of the present invention will be described with reference to the drawings. This embodiment is applied to a dimming device for an incandescent lamp 1 as an illumination load, for example, as a power control device for controlling power supply to a load, and is provided on an AC power supply line connecting the AC power supply 2 and the incandescent lamp 1. Is connected to a thyristor circuit 3 serving as a power supply circuit. The thyristor circuit 3 may be, for example, a pair of thyristors connected in anti-parallel, or a single bidirectional thyristor (= triac). In short, the power supplied to the incandescent lamp 1 is varied by variably controlling the ignition phase angle, and the incandescent lamp 1 is dimmed.

A control circuit 4 for controlling the operation of the thyristor circuit 3 is provided. Also,
Detecting means 5 for detecting an output voltage as an output state for the incandescent lamp 1 is also provided. The detection means 5 is provided on the AC power supply line for the incandescent lamp 1 and includes a detection winding 6 and an integration circuit 7, and is connected so as to feed back a detection output to the control circuit 4.

Here, the configuration of the control circuit 4 will be described. First, the control circuit 4 is connected between both ends of the AC power supply 2 so that data can be fetched and controlled in every half cycle of the AC voltage based on the detection of the zero crossing of the AC voltage. The control circuit 4 includes an arithmetic unit 8, a timer 9,
A microcomputer (M) mainly including the memory unit 10 and the like
PU) configuration, and the firing phase angle of the thyristor in the thyristor circuit 3 is appropriately controlled by the calculation in the calculation unit 8 based on the data and the like stored in the memory unit 10. The memory unit 1 in the control circuit 4
In 0, storage areas for various data such as target values are secured. The microcomputer incorporates an A / D converter 11 for A / D-converting the integrated output from the integration circuit 6. Also, the control circuit 4 (arithmetic unit 8)
The data of target output level = dimming level ( _Lo ) is taken in via the transmission unit 12 or the value set in the dimming level setting unit 13 is taken in through the A / D converter 14. It is configured to fit.

In such a configuration, dimming control according to the present embodiment will be described with reference to a flowchart shown in FIG. This data processing is performed by interrupt processing of the MPU incorporated as the control circuit 4. AC power supply 2
Activated by a zero-cross signal synchronized with the AC voltage of
Reads the output voltage value D _o at that time (present time) as the current value is stored in the memory unit 10 (Step S _1). Such data reading is performed every half cycle, and a predetermined number of cycles n (for example, n
= 10) is stored in the memory unit 10 as the immediately preceding data D _{1 to} D _n . Then, based on the dimming level _Lo requested at that time and stored in the memory unit 10, a corresponding target value (target output voltage value) D _M
Is calculated and stored in the memory unit 10 (step S
₂ ). Then, the dimming level L _o is compared set have dimming levels L ₁ and before half cycle (step S
₃ ). If the result of the comparison is less than a certain value (step S
_4), using the immediately preceding data D _o to D _n including presently stored in the memory unit 10, and an average of these values D _AV D
_AV = ΣD _i / (n + 1) is obtained and stored in the memory unit 10 (step S ₅ ). The calculation of the average value is not limited to the simple average, and may be an average calculation with weighting in a time series. Using this average value D _AV , an error D _ER with respect to the target value D _M is calculated, and processing is performed according to the calculation result, that is, the error D _ER is positive, negative, or zero (step S ₆ ). That is, if the error D _ER is zero, there is no need for correction. Therefore, the correction value ΔT is set to 0, and if the error D _ER is positive (+), the correction value ΔT is set to −. _ER negative (-) if, it sets the correction value ΔT to + (step S _7). Then, the current firing phase angle T _o is calculated by T _o = T ₁ (the firing phase angle in the immediately preceding half cycle) + ΔT (step S ₈ ). The arithmetic unit 8 of the control circuit 4 controls the phase angle of the thyristor in the thyristor circuit 3 to increase or decrease by ΔT so that the firing phase angle T _o calculated in this manner is obtained, thereby obtaining a desired dimming level L _o , Accordingly, the target value is set to the target value D _M (see FIG. 3... Thyristor control itself is processed according to another flowchart (not shown)). Thereafter, in order to provide control for the next half cycle, each data in the memory unit 10 is shifted (step S ₉ ).

Now, consider the case where the dimming level is greatly changed from the level before that. In this case, in step S _4, which acts as a determination means, a constant value | L _o -L ₁ | is set as ≧ 20,
If the level is changed 20 or more, the process proceeds to the control processing in step S _10. That is, in this case, all the data used to calculate the average value D _o to D _n is the target value D
Replaced by _M. Thus, this step S ₁₀ acts as a data replacement means.

[0020] After step S _10, the process proceeds to step S ₅ mentioned above. That is, these data _Do ~
A process of _obtaining an average value D _AV using D _n is performed.
Since D _M , D _AV = D _M. Therefore, is an error D _ER also becomes zero, the correction value [Delta] T = 0 in step S ₇ in the next step S _6. In other words, when the dimming level is changed by a certain value or more, the dimming level is replaced with the target value, which is regarded as equivalent to a case where there is no error, and the correction value ΔT for making the error zero. feedback control using is not performed, and only the original phase control such that the ignition phase angle point corresponding to the designated dimming level L ₀ is performed.

Therefore, at the time of switching in which the dimming level is largely changed, feedback control for eliminating errors is not performed, so that flicker does not occur and
Since there is no control of + and-, it immediately shifts to lighting at a desired dimming level. During this transition process,
In the next control, since the difference between the dimming levels is less than a certain value, the control returns to the normal control, and the error is calculated through the average value calculation process. While the number of values D _M decreases one by one, new immediately preceding data increases one by one, and the more the immediately preceding data increases, the closer to the target value. The data is smaller than the data that is not replaced with the target value D _M , and no flicker occurs.

In this embodiment, the magnitude of the change in the target value is determined by comparing the dimming levels L _o and L _1. However, the error _DER obtained in step S ₆ is smaller than a predetermined value. If it is large, for example, when D _ER > 10V, it is determined that there has been a large change in the dimming level, the error D _ER is forcibly set to zero, and all data D _{o to} D _n are set to the target values. D _M may be substituted.

In some cases, the output voltage from the thyristor circuit 3 cannot be detected directly for some reason. In this case, however, as shown in FIG. according to step S _11, S ₁₂ in the flowchart shown uptake, in FIG. 5 to the control circuit 4 detected by, by calculating the output voltage value D _o the current input voltage value D _i read, the predetermined conversion Alternatively, the output fluctuation may be detected indirectly.
Subsequent processing may be performed in the same manner as in the case shown in FIG.

Further, in this embodiment, the thyristor circuit 3 is used as a power supply circuit, and the power supplied to the incandescent lamp 1 is controlled by changing the firing phase angle according to the dimming level. From a different point of view, this can be said to be equivalent to variably controlling the ON time within a predetermined time (every half cycle). Therefore, for example, as shown in FIG. 6, even when the power supply circuit uses the PWM circuit 16 as shown in FIG. 6, the modulation of the pulse width is not limited to variably controlling the ON time within a predetermined time. Such a control configuration of the present embodiment can be similarly applied.

As a dimmer, for example, as shown in FIG. 7, a high-frequency inverter circuit (variable frequency power supply circuit) 18 including a pair of switching elements is provided for a discharge lamp 17 as an illumination load. In a configuration in which the power from the DC power supply 19 is converted to high frequency and supplied to the discharge lamp 17, the fluctuation of the output voltage to the discharge lamp 17
0 is detected and fed back to the control circuit 21,
Although there is a control circuit 21 to which a dimming signal is input, the operation of the high-frequency inverter circuit 18 is controlled. However, the present invention can be similarly applied to such a control circuit. That is, in this method, the control circuit 21 controls the switching frequency of the high-frequency inverter circuit 18 to increase or decrease in accordance with the dimming level, and controls the power supplied to the discharge lamp 17 to correspond to the dimming level. When the output voltage fluctuates in the dimming lighting state, the detecting means 2
By performing feedback control through 0, the switching frequency of the high-frequency inverter circuit 18 is increased or decreased finely. Therefore, also in the case of this method, by configuring the control circuit 21 according to the case of the above-described embodiment, when the dimming level is greatly changed to a certain value or more, fine adjustment of the switching frequency is performed. You can control not to.

Further, although not particularly shown, the dimming device is constructed by mounting the dimming device having the above-described configuration on a fixture body to which an illumination load such as the incandescent lamp 1 or the discharge lamp 17 is mounted. It is possible to provide a lighting device that does not cause flicker even when the level is largely changed.

[0027]

According to the first and second aspects of the present invention, when the output level, that is, the target value is largely changed, all data held for a predetermined cycle by the data replacement means are determined by the determination means. Since the data is replaced with the target value, the control circuit assumes that there is no error, and does not control the ON time or the switching frequency so that the error becomes zero. And the operation control is directly performed toward the target value.
It is possible to promptly shift to the desired output level state without causing unstable operation when switching the output level.

Therefore, according to the light control device of the present invention, even if the light control level is largely changed, the load can be quickly changed to the desired light control level without flicker. It can be shifted to lighting.

According to the fourth aspect of the present invention, since the dimming device according to the third aspect is used, it is possible to provide an illuminating device capable of largely changing the dimming level without hindrance.

[Brief description of the drawings]

FIG. 1 is a flowchart illustrating a dimming feedback control process according to an embodiment of the present invention.

FIG. 2 is a block diagram.

FIG. 3 is a timing chart showing control of a firing phase angle.

FIG. 4 is a block diagram showing a modification of the detection means.

FIG. 5 is a flowchart showing the dimming feedback control processing.

FIG. 6 is a block diagram showing a modification of the PWM method.

FIG. 7 is a block diagram showing a modification of a variable frequency type.

[Explanation of symbols]

Reference Signs List 1 lighting load = load 2 power supply 3 power supply circuit 4 control circuit 5 detecting means 15 detecting means 16 power supply circuit 17 lighting load = load 18 frequency variable power supply circuit 19 power supply 20 detecting means 21 control circuit S ₄ determining means S ₁₀ Data replacement means

──────────────────────────────────────────────────の Continuation of the front page (51) Int.Cl. ⁷ identification code FI H05B 41/392 H05B 41/392 F (58) Investigated field (Int.Cl. ⁷ , DB name) G05F 1/455 G05F 1 / 66 H05B 37/02 H05B 41/24 H05B 41/392

Claims (4)

(57) [Claims] 1. A power supply circuit interposed between a load and a power supply for controlling an on-time within a predetermined period to control power supplied to the load, and an output state to the load directly or indirectly at a predetermined cycle. And a target value corresponding to the set output level by holding the immediately preceding data from the present time up to a predetermined cycle in the output data detected by the detecting means and calculating an average value thereof. A power control device provided with a control circuit for controlling the operation of the power supply circuit so as to calculate an error by comparing the target value with zero, and determining a magnitude of a change in the target value; A data replacement unit that replaces all of the immediately preceding data held for the predetermined cycle with a target value when the determination unit determines that the target value has changed by a predetermined value or more. Power control device. 2. A frequency-variable power supply circuit interposed between a load and a power supply, wherein a switching frequency is controlled to control power supplied to the load, and an output state to the load is directly or indirectly controlled at a predetermined cycle. And a target value corresponding to the output level set by holding the immediately preceding data from the current time to a predetermined cycle in the output data detected by the detecting means, calculating an average value thereof, and And a control circuit for controlling the operation of the variable frequency power supply circuit such that the error is calculated and the error becomes zero. Data replacement means for replacing all immediately preceding data held for the predetermined cycle with a target value when the determination means determines that the target value has changed by a predetermined value or more. A power control device comprising: 3. A dimming device, wherein the load according to claim 1 or 2 is an illumination load, and the output level is a dimming level. 4. A lighting device comprising: a fixture main body; a lighting load mounted on the fixture main body; and the dimming device according to claim 3 for dimming and lighting the lighting load.