JPS6341309B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a phase control device including a bidirectional three-terminal thyristor (hereinafter referred to as TRIAT) and using a phase control semiconductor element and an operating point switching element of the phase control semiconductor element. Regarding.

Conventionally, brightness has been changed by adjusting the variable resistor for dimming adjustment using a phase control device that combines a trigger element such as a triac or diac, a variable resistor for dimming adjustment, and a capacitor.

In contrast, the phase control device of the present invention can change the phase control angle (brightness) to any desired value by arranging several touch-type push button switches and lightly pressing each switch. .

Next, the present invention will be explained with reference to drawings showing one embodiment thereof.

In the figure, 1 and 2 are both power supply terminals of a commercial AC power supply, 3 is an incandescent light bulb as a load, and 4 is an incandescent light bulb 3.
A triax 5 connected between both power supply terminals 1 and 2 via a triax 5 connects one end of the secondary winding to the triax 4
6 is a current-limiting resistor whose one end is connected to the connection point of the incandescent bulb 3 and the triax 4; 7 is a current-limiting resistor; A rectifier such as a diode bridge whose input terminals are connected to the other end of the resistor 6 and the power supply terminal 2; 8 is a Zener diode connected between both output terminals a and b of the rectifier 7; 9 and 10 are: Similarly, a first voltage dividing resistor and a second voltage dividing resistor are connected in series between both output terminals a and b of the rectifier 7, and 11 is the first voltage dividing resistor.
Voltage dividing resistor 9 and second voltage dividing resistor 10
12 is an N-gate thyristor (hereinafter referred to as PUT) for triggering such as PUT, whose gate is connected to the connection point of PUT 11 for triggering, and its cathode is connected to one end of the secondary winding of pulse transformer 5. A trigger capacitor connected to the anode,
The other end is connected to the output terminal b of the rectifier 7 together with the other end of the secondary winding of the pulse transformer 5 . 1
3 and 14 are smoothing capacitors and diodes connected in series between both output terminals a and b of the rectifier 7;
15 is a reverse bias Zener diode whose one end is connected to the output terminal a of the rectifier 7; 16 is a full lighting PUT whose anode is connected to the other end of the reverse bias Zener diode 15; 17 is a full lighting PUT 16 18 is the load resistance of the PUT 16 for all lighting, which has one end connected to the cathode of the PUT 16 for all lighting, and the other end connected to the connection point of the smoothing capacitor 13 and the diode 14. The first gate resistors 19 and 20 are connected in series between the cathode of the full lighting PUT 16 and the anode of the trigger PUT 11, and the first gate resistors 19 and 20 are a full lighting resistor and a full lighting diode, 21 are PUT16 for all anode lighting
The dimming PUT 22 connected to the anode of the dimming PUT 21 is connected to the cathode of the dimming PUT 21 and the smoothing capacitor 1.
3 and the load resistance of the dimming PUT 21 connected between the connection points of the diode 14; 23 is the load resistance of the rectifier 7;
The second gate resistors 24 and 25 are connected between the output terminal a of the dimming PUT 21 and the gate of the dimming PUT 21. Resistor and dimming diode, 26 is PUT16 for full lighting
27 is a first reverse bias capacitor connected between the cathode of the PUT 21 for dimming and the cathode of the PUT 21 for dimming; 27 is a second reverse bias capacitor connected at one end to the cathode of the PUT 21 for dimming;
8 is an off resistor connected between the other end of the second reverse bias capacitor 27 and the connection point of the smoothing capacitor 13 and diode 14; 29 is one end connected to the cathode of the full lighting PUT 16; A third reverse bias capacitor 30 has one end connected to the connection point between the second reverse bias capacitor 27 and the off resistor 28, and a third reverse bias capacitor 30 has one end connected to the connection point between the smoothing capacitor 13 and the diode 14. Resistor 31 is a push button switch for full lighting connected between the gate of PUT 16 for full lighting and the other end of resistor 30 for ON, 32 is PUT 2 for dimming.
A dimming pushbutton switch is connected between the gate of 1 and the connection point of the ON resistor 30 and the full lighting pushbutton switch 31, and 33 is the full lighting pushbutton switch.
It is an off push button switch connected between the connection point of the anode of the PUT 16 and the anode of the dimming PUT 21, and the connection point of the second and third reverse bias capacitors 27, 29 and the off resistance 28. .

Next, the operation of the above embodiment will be explained.

When a commercial AC power source is connected between both power supply terminals 1 and 2, the voltage rectified by the rectifier 7 is passed through the incandescent light bulb 3 and the current limiting resistor 6, and then the voltage is rectified by the first and second voltage dividing resistors 9 and 10. divided into voltages for triggering
A smoothed DC voltage is applied to the gate of PUT 11 and is generated across smoothing capacitor 13 .

In the above condition, push button switch 3 for all lights on
1 is pressed to turn on, the charge in the smoothing capacitor 13 flows through the first gate resistor 18, the full lighting push button switch 31, and the on resistor 30. Therefore, the gate voltage of the full lighting PUT 16 becomes lower than the anode voltage, a gate current flows, and the full lighting PUT 16 is instantly turned on and held.

By keeping the all-lighting PUT 16 turned on, the current rectified by the rectifier 7 is transferred to the trigger capacitor 12 through the low-voltage reverse bias Zener diode 15, all-lighting PUT 16, all-lighting resistor 19, and all It is charged via the lighting diode 20, and the charging voltage is applied to the trigger PUT.
If it becomes higher than the gate voltage of 11, the trigger
A gate current flows through the PUT 11, turning on the PUT 11, and a gate voltage is applied to the triac 4 via the PUT 11 and the pulse transformer 5 due to the charge in the trigger capacitor 12, turning the triac 4 on, and the AC Power is applied to the incandescent light bulb 3, which is a load, through the triax 4, and it is turned on. However, since the charging time constant of the entire lighting resistor 19 and the trigger capacitor 12 is set to be extremely short, the above-mentioned triax 4 The conduction angle is
When it reaches almost 100%, the incandescent bulb 3 lights up brightly.

In addition, the voltage across the triax 4 when it is non-conducting at the beginning of every half cycle of the input AC power supply is rectified, the smoothing capacitor 13 is charged, and the charged charge turns on the entire lighting PUT 16. In order to maintain this, the above-mentioned operation will also be maintained, and even if the push button switch 31 is released, the bright lighting of the incandescent bulb 3 will continue.

Next, when the dimming pushbutton switch 32 is pressed to turn on, the charge in the smoothing capacitor 13 flows through the second gate resistor 23, the dimming pushbutton switch 32, and the on resistor 30, and the dimming pushbutton switch 32 is turned on. The gate voltage of PUT21 is lowered,
A gate current flows from the anode to the gate of the dimming PUT 21, and the dimming PUT 21 is instantly turned on and held. When the dimming PUT 21 is turned on instantaneously, the voltage at the cathode of the dimming PUT 21 rises rapidly, and this voltage is passed through the first reverse bias capacitor 26 to the cathode potential of the full lighting PUT 16. Push up to turn off all lighting PUT16. Therefore, the current rectified by the rectifier 7 is passed through the low voltage reverse bias Zener diode 15, the full lighting PUT 16, and the full lighting resistor 1.
The trigger capacitor 12 was charged through the diode 9 and the full lighting diode 20, but the trigger capacitor 12 was charged through the
Since the PUT 21 is turned on and the entire lighting PUT 16 is turned off, the current rectified by the rectifier 7 is transferred to the reverse bias Zener diode 15,
It is charged via the dimming PUT 21, the dimming resistor 24, and the dimming diode 25, and as described above, when the charging voltage becomes higher than the gate voltage of the trigger PUT 11, a gate current flows through the trigger PUT 11. The PUT 11 is turned on, and a gate voltage is applied to the triax 4 by the charge in the trigger capacitor 12, the triax 4 is turned on, and AC power is applied to the incandescent bulb 3, which lights up, but the dimming resistor Since the charging time constants of 24 and the trigger capacitor 12 are set long, the conduction angle of the above-mentioned triax 4 decreases, and the incandescent bulb 3 lights up dimly and brightly. It is natural to rectify the voltage across the triax 4 when it is not conducting to charge the smoothing capacitor 13 and maintain the on state of the dimming PUT 21.
Even if you release the button, the dim light of the incandescent bulb 3 continues.

When the OFF pushbutton switch 33 is pressed, the charge in the smoothing capacitor 13 flows through the reverse bias Zener diode 15, the OFF pushbutton switch 33, and the OFF resistor 28. The voltage at the connection point between the bias capacitors 27, 29 and the OFF resistor 28 rises rapidly, and this voltage is applied to the second reverse bias capacitor 2.
7 and the third reverse bias capacitor 29, PUT 21 for dimming and PUT 16 for full lighting.
By raising the potential of both cathodes of PUT16,
Turn off 21. Since both PUTs 16 and 21 are turned off, the current flowing to and charging the trigger capacitor 12 stops, trigger PUT 11 also stops operating, and the gate input of triac 4 becomes zero and becomes incandescent without being turned on. Light bulb 3 goes off.

Moreover, when the push button switch 31 for all lighting is pressed while the dimming PUT 21 is turned on, the all lighting PUT 16 is turned on as described above, and as a result,
The cathode voltage of the PUT 16 for full lighting increases, and the voltage of the PUT for dimming increases through the reverse bias capacitor 26.
The cathode voltage of PUT 21 is increased, and the increased voltage turns off the dimming PUT 21 in preparation for the next time. As a result of the full lighting PUT 16 being turned on, as in the above operation, the triac 4 has a conduction angle of approximately 100%, and the incandescent bulb 3 lights up brightly again.

As is clear from the above explanation of the operation, when the bidirectional three-terminal thyristor of the present invention is turned off, voltage is taken out between the two terminals of the bidirectional three-terminal thyristor and rectified to operate the phase control semiconductor element. At the same time, a part of the voltage is smoothed to switch and maintain the operation of a switching element of a circuit that determines the operating point of the phase control semiconductor element, so that it can be switched in several stages such as bright, dark, dark, etc. According to the phase control device, by lightly pressing an arbitrary push button switch, an incandescent light bulb can be immediately turned on to a desired brightness.

Incidentally, it is easy to subdivide the amount of light attenuation and increase the number of stages of light attenuation, and the load is not limited to incandescent light bulbs, but also inductive loads such as motors can be used. Another feature is that the voltage of the control section is low direct current, so the electronic components are small and easily available, making it possible to provide high-quality products at low prices.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing a phase control device according to the present invention. 1, 2...Power terminal, 3...Incandescent light bulb, 4...
Bidirectional 3-terminal thyristor, 5...pulse transformer, 7...rectifier, 11...trigger PUT, 1
2...Trigger capacitor, 13...Smoothing capacitor, 16...PUT for full lighting, 21...PUT for dimming, 26, 27, 29...Capacitor for reverse bias of 1.2.3., 31... Push button switch for full lighting, 32... Push button switch for dimming, 3
3...Push button switch for off.

Claims (1)

[Claims] 1. A phase control device including a bidirectional thyristor connected in series to a load and a CR time constant circuit for supplying gate current to the thyristor, comprising: a plurality of phase control switches that instruct the angle and an off switch that instructs the bidirectional thyristor to turn off; a plurality of PUTs that are provided corresponding to each of the plurality of phase control switches and that turn on when each switch is pressed; , when one PUT turns on the other
a first reverse bias applying means for applying a reverse bias to the PUTs to turn them off; and a second reverse bias applying means for applying a reverse bias to all of the plurality of PUTs to turn them off when the off switch is pressed; The feature is that a number of time constant circuits corresponding to the plurality of PUTs are provided, each of which is connected to operate with the on-current of each PUT, and the time constant of each CR time constant circuit is set to a different size. phase control device.