JPS5843195Y2 - Dimmer with delay mechanism - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a dimmer with a delay mechanism.

Conventionally, in this type of dimmer, as shown in FIG. ) was configured as a delay switch circuit that turned on all phases, which had the disadvantage that leakage current from the capacitor C1 caused problems in circuit operation.

The present invention was developed in view of the above-mentioned drawbacks, and its purpose is to enable switching between dimming and delayed off by switching a changeover switch with 1 circuit and 2 contacts. To provide a dimmer with a leakage mechanism that performs delayed off operation by discharging a charge and eliminates troubles in circuit operation due to leakage current of a capacitor.

The present invention will be explained below with reference to examples.

FIG. 2 shows an example circuit, in which a lamp 4 is connected to an AC power source 5 via a bidirectional switching element 3 and a choke coil 2, and when the bidirectional switching element 3 is turned on in all phases. It lights up 100% of the time, and when the phase is controlled, the light is dimmed depending on the conduction angle.

7 is a one-circuit, two-contact changeover switch, and when connected to the first contact A side, the phase control circuit 8 composed of the SBS element 6, time constant resistor R1, capacitor C2, etc. is used as a bidirectional switching element. 3, and a series circuit of a resistor R2, a diode D1, and a delay time setting capacitor C1 is connected in parallel to the bidirectional switching element 3.

Also, when connected to the second contact side B side, the diode D
2, resistor R3, light emitting diode LED, and transistor T
A series circuit with r1 is connected in parallel to the bidirectional switching element 3.

The phase control circuit 8 connects its output to the gate of the bidirectional switching element 3, and controls the phase of the bidirectional switching element 3 at a predetermined conduction angle.

Transistor Tr. is diode D1 and capacitor C
The base is connected to the connection point of C1 through a resistor R4, and turns on when the voltage across the capacitor C1 exceeds a predetermined level.

The light emitting diode LED is composed of a photoconductive element 9 such as a CdS element and a photocoupler 10, and the resistance value of the photoconductive element 9 is made extremely low when emitting light.

The photoconductive element 9 is connected between the T1 terminal and the gate of the bidirectional switching element 3 via a resistor R5, and turns on the bidirectional switching element 3 in all phases when the resistance value is low. There is.

If it is desired to perform dimming, the selector switch 7 is connected to the first contact A side at time t1 as shown in FIG. 2a.

In this case, the AC power supply 5 is connected to the phase control circuit 8 through the lamp 4.
A current flows through the phase control circuit 8, and the phase control circuit 8 operates to control the phase of the bidirectional switching element 3, thereby dimming and lighting the lamp 4 as shown in FIG. 2d.

At the same time, the delay time setting capacitor C1 is charged through the resistor R2 and the diode D1 as shown in FIG.

Next, at time t2, when the changeover switch 7 is switched to the second contact B side, the charge of the capacitor C1 is discharged through the base of the transistor Tr, turning on the transistor Tr1 and causing a collector current to flow.

Therefore, the light emitting diode LED emits light as shown in FIG. 2C, and the resistance value of the photoconductive element 9 decreases.

Therefore, the resistor R is connected to the gate of the bidirectional switching element 3.
A gate current flows through the photoconductive element 5 and the photoconductive element 9, turning on the bidirectional switching element 3 in all phases and switching the lamp 4 to the second
All lights are turned on as shown in Figure d.

When the voltage across the capacitor C1 eventually decreases and the transistor Tr is turned off, the light emitting diode LED stops emitting light, the resistance value of the photoconductive element 9 increases, and the gate current of the bidirectional switching element 3 decreases. The lamp 4 is turned off.

Since the present invention is constructed as described above, it is possible to switch between dimming and delayed off using a switch with 1 circuit and 2 contacts. Since this is done by discharging, there is no trouble in circuit operation due to leakage current of the capacitor.

[Brief explanation of the drawing]

Fig. 1 is a partial circuit diagram of a conventional example, Fig. 2 is a circuit diagram of an embodiment of the present invention, Figs. B is the second contact,
8 is a phase control circuit, 3 is a bidirectional switching element, 4
5 is a lamp, 5 is an AC power supply, C1 is a delay time setting capacitor, Dl is a diode, and Tr is a transistor.

Claims (1)

[Scope of utility model registration request] When a 1-circuit, 2-contact changeover switch is connected to the first contact side, the output of the phase control circuit that operates by being energized through the first contact can be inserted in series into the closed circuit between the lamp and the AC power supply. In addition to controlling the phase of the switching element, the delay time setting capacitor is a diode and the first
When charging is performed through the contact and the changeover switch is connected to the second contact side, a collector current is passed through the transistor whose pace emitter is connected to the delay time setting capacitor, and the voltage across the delay time setting capacitor is lower than a predetermined level. A dimmer with a delay mechanism, which turns on a transistor until a dimmer reaches a dimmer, and uses this on output to turn on the bidirectional switching element in all phases.