JPS61110994A - Arc discharge breaker for dc lamp bulb and lighting apparatus containing the same - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for interrupting arcing of a DC lighting bulb and a lighting device incorporating the same.

When using an incandescent lamp at high brightness, increasing the AC voltage is not preferable because the peak value becomes extremely high. Therefore, by full-wave rectifying the alternating current and charging it into a large-capacity capacitor, it is possible to obtain a direct current voltage that is close to the peak value of the alternating current, and by lighting a light bulb with that direct current, a high brightness can be obtained. A good light source without flickering can be obtained. However, he discovered that when a light bulb is lit with direct current, the moment the light bulb's filament breaks, arc discharge occurs due to the gas filled in the light bulb, resulting in a continuous current several tens of times higher than the steady-state value.

The value can reach 100 amperes even for a (i) watt light bulb.

In order to eliminate these drawbacks, the present invention inserts a current limiter into the current circuit that operates in a short time after the occurrence of an arc current that is several tens of times higher than the steady current. The large arc discharge current generated instantly interrupts the circuit to prevent damage to the switch and semiconductor components.

That is, in the present invention, when a direct current obtained by rectifying an alternating current power supply with a rectifier is used as a power source for an incandescent light bulb, a current limiter is inserted in the current circuit to control the arc discharge current caused by the filament breakage of the light bulb. The gist of this invention is an arc discharge interrupting device for a DC lighting bulb, which is characterized by operating its current limiter to interrupt the circuit. Furthermore, the present invention provides a lighting device that incorporates an arc discharge cutoff device for the DC lighting bulb.

Hereinafter, the present invention will be explained according to illustrated embodiments.

FIG. 1 is a basic explanatory diagram of the system. A commercial alternating current power supply AC is passed through a switch S1 and rectified by a rectifier A, and then a capacitor C is charged with the full wave rectification, which is then converted to direct current, which is used as a power source for an incandescent light bulb. In the case of steady current, the current limiter B1, for example, an auto breaker, does not operate, so the switch S2 is closed and alternating current is flowing, but the filament of the incandescent lamp breaks and an arc discharge occurs, causing the - current to reach the steady value. When the current limiter B becomes several tens of times larger than the current limiter B, the current limiter B is instantaneously activated, and the switch S2 is instantaneously opened to cut off the current.

The current waveform is shown in FIG. Waveform (11 shows the commercial AC voltage waveform, waveform (2) is the output voltage waveform of rectifier A. Waveform (3) is the waveform of the current flowing through the incandescent lamp, and the steady current value is To The value is as shown in , but at the moment when the filament of the incandescent light bulb breaks, it enters an arc discharge state from T+ and a current several tens of times higher flows.・A large current also flows in the current coil M of the current limiter B, and the switch S2
will be activated and the circuit will be cut off. The moment is short, about 1 to 2 Hz, and can prevent damage to switches, semiconductors, and other components in the circuit.

It is very difficult to cut off the current at the moment when a large current occurs, so even if the detection current is determined to be direct current, the cutoff switch S2 is installed in the alternating current circuit to better maintain the switch contact. It is something.

Figure 3 is an application example in which a current limiter B is installed in a circuit with a capacitor C and an incandescent lamp.
The electric charge is activated by the current generated by the arc discharge of an incandescent lamp, and the electric current path of the AC circuit is interrupted.

When the filament of an incandescent light bulb breaks and a large current from capacitor C enters current coil M in current limiter B, the movable iron piece Q is pulled by the attraction force and switch S2
is released and cuts off the AC power supply. Further, if the movable iron piece Q is manually moved to the right, the switch S2 is turned on, so that it can be used as an auto breaker and also as a manual power switch.

FIG. 4 is a partial explanatory diagram of the current limiter B, and is an application example in which the current limiter B and the power switch are shared. The movable iron piece Q is attracted by the current flowing through the magnetic coil M, and the contact of the switch S2 is opened and the movable iron piece Q is fixed by the stopper H. If this is done manually, by momentarily pushing the pusher of the stopper H like an arrow through sliding displacement or buckling motion, the restraint of the stopper H is released and the movable iron piece Q is returned to its original position. Close switch S2. When opening the switch S2, the purpose can be achieved by pushing the movable iron piece Q downward.

Figure 5 shows an example of an auto breaker, in which when a tortoise current of an arc flows through the free current coil M, it attracts the movable iron piece Q, opening the switch S2, and at the same time, the movable iron piece Q is attracted by the permanent magnet P. It will remain as it is.

Figure 6 shows an iron core F and a permanent magnet P arranged at the center of a DC coil M. When a movable iron piece Q is attracted by a large current and approaches the permanent magnet P, it is attracted to the magnetic pole, and the movable iron piece Q When it is attracted to the magnetic core F, it is attracted by the permanent magnet P,
Switch S2 remains open to maintain that state.

In FIG. 7, the suction state is mechanically maintained, and when the movable iron piece Q is attracted by the current coil M, it falls downward and enters the notch of the stopper H, and the movable iron piece Q does not return. When the stopper H is pressed, the movable iron piece Q is separated from the stopper H and returns to its original state.

FIG. 8 shows an example of an actual application to a desk lamp or the like, in which a current limiter B and a manual power switch S1 from a commercial AC power source are shared. By manually closing the switch S1, the container CI is charged by the diode Dl and the time constant resistor R1. After a certain period of time, when the voltage of capacitor Cr reaches the operating voltage of relay DM, switch S3 is closed, series resistor R5 is shorted, the full voltage is applied to rectifier A, and the voltage of capacitor C turns on the incandescent lamp. . The series resistor R8 is for reducing inrush current, and is short-circuited after energization of several hertz to more than ten hertz.

FIG. 9 shows an example of application when used as a desk lamp or the like. When the manual power switch S+ is turned on, voltage is supplied to the rectifier A through the series resistor R8. Its output is capacitor C
It charges and becomes a power source for an incandescent light bulb.

Further, after a certain period of time when the DC voltage rectified by the rectifier A closes the switch S3, the electromagnet EM closes the series resistor S. The series resistor R8 serves to reduce the rush current when the switch is turned on. If an incandescent light bulb breaks during use, an arc occurs within the light bulb, causing a current several tens of times higher than normal to flow. The current flows through the current coil M of the current limiter (auto breaker) B and opens the switch S2 to cut off the AC power supply circuit.

In Figure 10, when the current limiter (auto breaker) B is manually closed by the switch S2, the circuit power is generated from the rectifier A through the series resistor R3. A current flows through R8 in series. After a period of a fraction of a second to a fraction of a second after the switch is turned on, the delay 1-DM is activated and the short-circuit switch 83 is activated! The closed series resistor R3 is shorted and the full voltage is applied to the load for the first time. This delay relay D
The delay time of 1 ru of M is determined by the temperature rise time of the filament of an incandescent lamp, and is several hertz at the AC power frequency.

[Brief explanation of the drawing]

Figure 1 is a basic circuit diagram, Figure 2 is its waveform diagram, Figure 3 is a circuit diagram of an auto breaker inserted into an incandescent light bulb and capacitor circuit, and Figures 4 to 7 each show an example of the auto breaker. Figure 8 is a circuit diagram showing an application example of a lighting device, Figure 9 is a circuit diagram showing an application example of a desk lamp, and Figure 10 is a circuit diagram showing an application example of a lighting device. be. The symbols in the figure are explained as follows.

Claims (6)

[Claims] (1) When using DC current obtained by rectifying AC power with a rectifier to power an incandescent light bulb, a current limiter is inserted in the current circuit, and the current limiter is activated by the arc discharge current caused by the filament breakage of the light bulb. An arc discharge interrupting device for a DC lighting bulb, characterized in that it activates and interrupts a circuit. (2) The arc discharge interrupting device for a DC lighting lamp as set forth in claim 1, wherein the current limiter is an auto breaker. (3) To prevent inrush current at the moment the power switch is turned on, an inrush current prevention resistor and its short-circuit switch are installed in the middle of the AC power supply circuit, and after a certain period of time after the switch is turned on, the relay switch is activated by the time constant of the resistance and capacitance. An arc discharge interrupting device for a DC lighting lamp according to claim 1 or 2, characterized in that the device operates to short-circuit a resistor. (4) When using DC current obtained by rectifying AC power with a rectifier to power an incandescent light bulb, a current limiter is inserted in the current circuit, and the current limiter is activated by the arc discharge current caused by the filament breakage of the light bulb. A lighting device characterized by being activated and interrupting a circuit. (5) The lighting device according to claim 4, wherein the current limiter is an auto breaker. (6) In order to prevent inrush current at the moment when the power switch is turned on, a resistance for inrush current prevention and a short-circuit switch are installed in the middle of the AC power supply circuit, and after a certain period of time after the switch is turned on, the relay switch is activated by the time constant of the resistance and capacitance. 6. The lighting device according to claim 4, wherein the lighting device operates to short-circuit the resistor.