JPH09245971A - Ac phase control device, lighting device, dimming device, and lighting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve output precision. SOLUTION: An AC output of an AC power supply 2 is full waverectified to be a full wave rectified output, which is converted into an effective value, and an on/off time control is performed to a TRIAC 9 for controlling the AC output based on the converted value, and an on/off time control is performed to a transistor 7 to control the full wave rectified output to form similar waveform to the controlled waveform of the AC output. By a diode 22 having a forward direction voltage of an almost similar degree to a forward direction voltage of the transistor 7, the forward direction voltage of the transistor 7 is subtracted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an AC phase control device, a lighting device, a light control device, and a lighting device.

[0002]

2. Description of the Related Art FIG. 9 is a circuit diagram showing a configuration of a conventional AC phase control apparatus 1. In this figure, the output of the AC power supply 2 is full-wave rectified by the full-wave rectifier circuit 3, divided by the resistors 4 and 5, and input to the control circuit 6. The control circuit 6 calculates the effective value of the input voltage, turns on the PNP transistor 7 at a timing based on the effective value, and creates a rectified output having the same waveform as the output.
Input it as a feedback signal. in this case,
The control circuit 6 turns on the transistor 7 in synchronization with the timing at which the triac 8 inserted in series with the load 10 is turned off. The control circuit 6 turns on / off the triac 8 by turning on / off the photodiode 9a of the triac photocoupler 9. That is, turning on the photodiode 9a of the triac photocoupler 9 turns on the triac 9b of the coupler 9,
The triac 9 is turned off by turning off the photodiode 9a.
b turns off. In this way, a constant output based on the rectified output that is the feedback signal is applied to the load 10
Is supplied to. An incandescent light bulb, a halogen light bulb, or the like is used as the load 10.

As shown in FIG. 10, the control circuit 6 has an effective value conversion circuit 11, a comparator 12, and resistors 13 and 14 for generating a reference voltage. The voltage divided by the resistors 4 and 5 is applied to the effective value conversion circuit 11. The effective value conversion circuit 11 obtains the effective value of this voltage. At the inverting input terminal of the comparator 12, the effective value conversion circuit 1
1 output is applied, and resistors 13 and 14 are applied to the non-inverting input terminals.
The reference voltage Vref obtained by dividing by is applied. The output of the comparator 12 is applied to the photodiode 9a of the triac photocoupler 9 and the base of the transistor 7. When the output of the effective value conversion circuit 11 is larger than the reference voltage Vref, the output becomes "L" and the transistor 7 is turned on, and the output of the effective value conversion circuit 11 becomes the reference voltage Vre.
When it is smaller than f, its output becomes "H" and the photodiode 9a of the triac photocoupler 9 is turned on.

The voltage waveform VO at each part shown in the figure,
As for Va, Vb, and Vc, the load 10 is a voltage whose phase angle is half.
It is a waveform when supplied to. In FIG. 9, the resistor 15 and the capacitor 16 are for supplying a DC voltage to the control circuit 6, and the full-wave rectified current output from the full-wave rectifier circuit 3 is smoothed to obtain a DC voltage.

[0005]

The conventional AC phase control device described above has the following problems. That is, while controlling the triac 8, the transistor 7 is controlled so as to have a waveform similar to the waveform of the output of the AC power supply 2 controlled by the triac 8, but the rectified output controlled by the transistor 7 is controlled. Includes the forward voltage (about 0.6 V) when the transistor 7 is turned on, and the accuracy of the AC output controlled by the triac 8 is reduced accordingly. For example, since the forward voltage of the transistor 7 is included in the ideal waveform as shown in FIG.
2 and FIG. 13, the portion indicated by “A” is supplied to the load 10. In particular, as the output supplied to the load 10 is reduced, the proportion of the portion indicated by "A" becomes larger than the proportion indicated by "B" as shown in FIG. As described above, the forward voltage of the transistor 7 affects the output accuracy, and the output accuracy cannot be high. Therefore, it is difficult to apply the electronic apparatus to the electronic equipment that requires the output accuracy.

Therefore, an object of the present invention is to provide an AC phase control device, a lighting device, a light control device, and a lighting device capable of improving output accuracy.

[0007]

According to a first aspect of the present invention, there is provided a first switch element for controlling a rectified output obtained by rectifying an AC output; and a second switch element for controlling the main power output. Converting the rectified output controlled by the first switch element into an effective value, and controlling the on / off time of the second switch element based on the effective value;
Further, the ON / OFF time of the second switch element is controlled at the same time as the ON / OFF time of the first switch element is controlled to change the waveform of the rectified output to the AC output controlled by the second switch element. Control means having the same waveform; and a forward voltage component of the first switch element, which is interposed between the control means and the first switch element and turns on the first switch element. And a semiconductor element having approximately the same forward voltage component. The effective value in the present invention means Erms that is academically determined.
In addition to / (Edc ² + Eac ² ) ^1/2 (dc: direct current, ac: alternating current), it means an approximate value of 5% or less with respect to a phase-controlled input waveform.

According to this structure, the rectified output obtained by rectifying the AC output is controlled by the first switch element and then converted into an effective value, and a second output for controlling the AC output based on the effective value. The on / off time of the switch element is controlled. Further, the on / off time of the first switch element is controlled simultaneously with the control of the on / off time of the second switch element, and a rectified output having a waveform similar to the waveform of the AC output is obtained. The rectified output controlled by the first switch element includes a subtle forward voltage component when the first switch element is on. This forward voltage component depends on the forward voltage component of the semiconductor element. Deducted.

In this case, when the first switch element is turned off, the forward voltage of the semiconductor element is subtracted from the rectified output as it is. However, if the semiconductor element is not used, the first switch element is In the case of a PNP-type transistor, when the ON time is lengthened, that is, when the phase width of the rectified output is narrowed, the forward voltage component of the transistor in the rectified output occupies a large proportion. Accuracy deteriorates. When there is such a tendency, it is particularly effective to use a semiconductor element. Therefore, the forward voltage component of the first switch element that controls the rectified output is subtracted by the forward voltage component of the semiconductor element, so that even if the phase width of the rectified output is reduced, the decrease in the output accuracy is minimized. You can

As the semiconductor element, for example, a diode is suitable. When the AC output is large, the rectified output may be applied to the first switch element by using, for example, two resistors to divide the voltage. When a PNP-type transistor is used as the first switch means, its emitter is connected to a portion for obtaining a divided voltage output of a plurality of resistors, and its collector is grounded. The diode has its anode connected to the emitter of the transistor and its cathode connected to the effective value conversion side. When a PNP type transistor is used, by turning on the second switch element (for example, triac) and turning off the transistor at the same time, a rectified output having a waveform similar to the waveform of the AC output controlled by the second switch element is obtained. can get.

The magnitude of the AC output supplied to the load can be changed by changing the timing for controlling the on / off time of the first switch element and the second switch element. For example, when the on / off switching of the first and second switch elements is performed by comparing the rectified output converted into the effective value with the reference value, the output of the comparison unit is adjusted by adjusting the reference value. Changes from "H" to "L" or from "L" to "H". A lighting device or a dimming device can be realized by inserting a power switch on the power input side of the AC phase control device and accommodating it in a housing. Furthermore, it is possible to realize a lighting device using the lighting device or the light control device.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. A. Embodiment of AC Phase Control Device FIG. 1 is a circuit diagram showing a configuration of an embodiment of an AC phase control device according to the present invention. Further, FIG. 2 is a circuit diagram showing a configuration of the control circuit 6 of the same embodiment. In FIGS. 1 and 2, the same parts as those in FIGS. 9 and 10 described above are designated by the same reference numerals. The AC phase control device 20 of this embodiment has a diode 22 between the common connection end of the resistors 4 and 5 and the feedback signal input end of the control circuit 6.
Is inserted. In this case, as shown in FIG. 2, the effective value conversion circuit 11 side is inserted in the forward direction.

By inserting the diode 22 between the common connection end of the resistors 4 and 5 and the feedback signal input end of the control circuit 6, the forward voltage component when the transistor 7 is turned on can be subtracted. It will be possible. That is, since the forward voltage of the diode 22 is about 0.6 V, which is substantially the same as the forward voltage of the transistor 7, the control circuit 6
The voltage subtracted by the forward voltage of the diode 22 is applied to the input terminal of the feedback signal.
The forward voltage of a diode or transistor using silicon is about 0.6V, but it is about 0.3V for a diode or transistor using germanium, although it is not used recently.

Further, the transistor 7 is easily affected by the temperature, and the forward voltage changes accordingly. However, the diode 22 also changes the forward voltage due to the temperature change, so that the ambient temperature changes. There is no change in the subtracted voltage. It is possible to insert a resistor to lower the forward voltage of the transistor 7, but it is difficult to deal with the temperature change because the influence of temperature is not so large as that of the diode 22, and the control circuit 6 has a problem. Since an operational amplifier (OP amplifier) is generally used in the input stage of the effective value conversion circuit 11, the gain may change when a resistor is inserted. Therefore, it can be said that the diode 22 is best used.

Further, by inserting the diode 22, the forward voltage of the transistor 7 is subtracted, but as shown in FIG. 3, in addition to the portion indicated by "A", "B" is added.
The part indicated by will also be subtracted at the same time. However, since the portion indicated by "B" is smaller than the portion indicated by "A", the decrease in output accuracy due to that portion is negligible. As described above, the output accuracy can be improved as compared with the conventional case in which the error becomes larger as the output becomes smaller, that is, the phase width becomes narrower.

As described above, in this embodiment, the full-wave rectified output obtained by full-wave rectifying the alternating-current output of the alternating-current power supply 2 is converted into an effective value, and the alternating-current output is controlled based on the converted value. While controlling the on / off time,
The on / off time of the transistor 7 for controlling the full-wave rectified output is controlled so that the waveform is similar to the waveform for controlling the AC output, and the forward voltage is approximately the same as the forward voltage of the transistor 7. The forward voltage of the transistor 7 is subtracted by the diode 22. Therefore, since the forward voltage of the transistor 7 that controls the full-wave rectified output is subtracted by the forward voltage of the diode, even if the phase width of the full-wave rectified output is narrowed, the deterioration of the accuracy of the AC output is minimized. It is possible to improve the AC output accuracy as a whole.

In the AC phase control device 20 of this embodiment, the PNP transistor 7 is used, but an NPN transistor can be used by providing an inverter at the output of the comparator 12. . In this case, it goes without saying that the output of the comparator 12 is directly applied to the photodiode 9a of the triac photocoupler 9. In addition to the lighting device 30, the light control device 40, and the lighting device 50 described below, the AC phase control device 20 of this embodiment controls the phase of the AC power supply to supply power stably to the load. The present invention can be applied to any of the above electronic devices.

B. Embodiment of Lighting Device FIG. 4 shows a lighting device 30 using the AC phase control device 20.
FIG. 3 is a circuit diagram showing a configuration of the embodiment. This lighting device 30 is one in which a power switch 32 is provided at the input stage of the AC phase control device 20 and is built in a housing 33.
Further, a power cord 34 with a plug is attached to the housing 33 via two power input terminals Ti. Case 3
A load 10 such as an incandescent lamp or a halogen lamp is connected to the two power output terminals To of No. 3. This lighting device 30 is
Since the AC phase control device 20 is used, it has high output accuracy.

C. Embodiment of Light Control Device FIG. 5 shows a light control device 40 using the AC phase control device 20.
FIG. 3 is a circuit diagram showing a configuration of the embodiment. The dimming device 40 includes a power switch 32 at the input stage of the AC phase control device 20 and a variable resistor 4 used for adjusting the output voltage.
2 is provided in the housing 43. A power cord 34 with a plug is attached to the housing 43 via two power input terminals Ti. Case 43
A load 10 such as an incandescent light bulb or a halogen light bulb is connected to the two power output terminals To.

The variable resistor 42, as shown in FIG. 6, has a reference voltage Vre applied to the non-inverting input terminal of the comparator 12.
This is for adjusting f, and by adjusting the reference voltage Vref in the lower direction, the ON time of the transistor 7 becomes longer, and the phase width is narrowed as shown in FIG. The output is decreasing. On the contrary, the phase width is widened by adjusting the reference voltage Vref to be higher, and the output supplied to the load 10 is increased. The dimming device 40 includes an AC phase control device 20.
Has high output accuracy. By using a variable resistor with a power switch for the light control device 40, the power switch 32 and the variable resistor 42 can be integrated.

D. Embodiment of Illumination Device FIG. 8 is a perspective view showing a configuration of an embodiment of an illumination device 50 using the light control device 40. This lighting device 50 is
An incandescent light bulb 10A, a lamp mounting part 51 to which the incandescent light bulb 10A is attached, a base 52, a support column 53 connecting the base 52 and the lamp mounting part 51, a power switch 32 and a variable resistance 42 integrated power source. Variable resistor with switch 54
And a light control device 40 having. After the plug of the power cord 34 with a plug is inserted into an outlet, the variable resistor 54 is removed from the off position to supply power to the circuit. When the variable resistor 54 is turned clockwise after the power is turned on, the output supplied to the incandescent lamp 10A increases and becomes brighter. On the contrary, when the variable resistor 54 is turned counterclockwise, the output supplied to the incandescent light bulb 10A decreases and becomes dark. This lighting device 5
Since 0 uses the dimmer 40, it has high output accuracy. The lighting device 30 may be used instead of the light control device 40 in the lighting device 50.

[0022]

According to the AC phase control device of the first, second, third, fourth, fifth and sixth aspects, the rectified output obtained by rectifying the AC main power output is controlled to have a waveform similar to that of the main power. The forward voltage when the first switch element is turned on is subtracted by the forward voltage of the semiconductor element. Therefore, the on time of the first switch element is lengthened and the phase width of the rectified output is narrowed. Also, it is possible to minimize the decrease in the accuracy of the main power supply output, and it is possible to improve the output accuracy as a whole. According to the alternating-current phase control device of the seventh aspect, since the timing for controlling the on / off time of the first switch element and the second switch element can be adjusted, the accuracy is high in the entire adjustable range. The effect that the output can be set is obtained.

According to the lighting device of the eighth aspect, since the AC phase control device according to any one of the first to sixth aspects is used, it is possible to provide the lighting device with high output accuracy. According to the dimmer of claim 9, since the AC phase controller of claim 7 is used, it is possible to provide a dimmer capable of setting the output with high accuracy in the entire adjustable range. Is obtained. According to the lighting device of the tenth aspect, since the lighting device of the eighth aspect is used, it is possible to obtain the effect of providing the lighting device with high output accuracy. According to the lighting device of the eleventh aspect, since the light control device of the ninth aspect is used, it is possible to provide the lighting device capable of setting the output with high accuracy in the entire adjustable range. .

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a configuration of an AC phase control device according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a control circuit of the AC phase control apparatus of the same embodiment.

FIG. 3 is a diagram showing a full-wave rectified output waveform of the AC phase controller of the same embodiment.

FIG. 4 is a circuit diagram showing a configuration of an embodiment of a lighting device according to the present invention.

FIG. 5 is a circuit diagram showing a configuration of an embodiment of a light control device according to the present invention.

FIG. 6 is a block diagram showing a configuration of a control circuit of the light control device of the same embodiment.

FIG. 7 is a diagram showing a full-wave rectified output waveform of the dimmer of the same embodiment.

FIG. 8 is a perspective view showing a configuration of an embodiment of a lighting device according to the present invention.

FIG. 9 is a circuit diagram showing a configuration of a conventional AC phase control device.

10 is a block diagram showing a configuration of a control circuit of the AC phase control device shown in FIG.

FIG. 11 is a diagram showing an ideal full-wave rectified output waveform of a conventional AC phase control device.

FIG. 12 is a diagram showing an actual full-wave rectified output waveform of a conventional AC phase control device.

FIG. 13 is a diagram showing an actual full-wave rectified output waveform of a conventional AC phase control device.

[Explanation of symbols]

 4, 5 Resistance (voltage dividing means) 6 Control circuit (control means) 7 Transistor (first switching element) 8 Triac (second switching element) 10 Load 20 AC phase control device 22 Diode (semiconductor element) 30 Lighting device 32 power switch 33, 43 housing 40 dimming device 42 variable resistance (adjusting means) 50 lighting device 54 variable resistance with power switch (adjusting means)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ryota Ishihira 3-3-9 Shimbashi, Minato-ku, Tokyo Inside Toshiba Abu E Co., Ltd.

Claims (11)

[Claims] 1. A first switch element for controlling a rectified output obtained by rectifying an AC output; a second switch element for controlling the main power source output; and a first switch element controlled by the first switch element. After converting the rectified output to an effective value,
ON / OFF of the second switch element based on the effective value.
The off time is controlled, and the on / off time of the second switch element is controlled at the same time as the on / off time of the first switch element is controlled to obtain the waveform of the rectified output by the second switch element. Control means for making the waveform of the alternating current output to be controlled; this first switch element interposed between the control means and the first switch element when the first switch element is turned on And a semiconductor element having a forward voltage component substantially equal to the forward voltage component of the above. 2. A second switch element for turning on / off a rectified output obtained by rectifying an AC output by controlling the first switch element, converting the rectified output to an effective value, and controlling the AC output based on the converted value. This second at the same time controlling the off time
The forward voltage when the ON / OFF time of the second switch element is controlled so that it has a waveform similar to the waveform of the AC output controlled by the switch element, and the forward voltage when the first switch element is turned ON An AC phase control device, wherein the forward voltage of the first switch element is subtracted by a semiconductor element having a forward voltage substantially equal to the above. 3. The AC phase control device according to claim 1, wherein the first switch element is a transistor, and the semiconductor element is a diode. 4. A voltage dividing means for dividing the rectified output obtained by rectifying the AC output; the first switch element controls the rectified output divided by the voltage dividing means. The AC phase control device according to any one of claims 1 to 3, 5. The voltage dividing means comprises a plurality of resistors, and the transistor has an emitter and a collector interposed between a common connection portion of the plurality of resistors of the voltage dividing means and a ground. 5. The diode is inserted between a common connection part of a plurality of resistors of the voltage dividing means and the control means, with the control means side as a forward direction. The AC phase control device according to Crab. 6. The transistor is a PNP type transistor, the emitter of which is connected to a common connection portion of a plurality of resistors of the voltage dividing means, and the collector of which is grounded, and the control means includes the second transistor. 6. The AC phase control device according to claim 3, wherein the transistor is turned off at the same time when the switching element of FIG. 7. The first switch element and the second switch element.
7. The AC phase control device according to claim 1, further comprising adjusting means for adjusting a timing for controlling the on / off time of the switch element. 8. The AC phase control device according to claim 1, a power switch inserted on the main power input side of the AC phase control device, and the AC phase control device together with the power switch. A lighting device comprising: a housing for housing. 9. The AC phase control device according to claim 7, a power switch inserted on the main power input side of the AC phase control device, and a housing that houses the AC phase control device together with the power switch. A dimmer which is provided. 10. A lighting device comprising: the lighting device according to claim 8; and a light bulb which is lit by an AC output from the lighting device. 11. A lighting device, comprising: the light control device according to claim 9; and a light bulb that is turned on by an AC output from the light control device.