JPS59215697A - Rush current reducing device of incandescent bulb - 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 reducing inrush current in V when an incandescent lamp is turned on.

At the moment when an incandescent light bulb is turned on, the filament of the incandescent light bulb is at room temperature, so its resistance is low, and at the moment the switch is turned on, an inrush current of more than 10 times the constant value is generated.
This causes the bulb filament to break.

The present invention provides 11! :i, Insert an impedance in the column and suppress the inrush current that flows at the moment the switch is turned on to about the steady current of a light bulb, and after a period of 11.1 seconds has passed, the temperature of the filament will rise and its resistance will drop. When the light bulb is turned on, the full voltage is applied to the filament of the light bulb, causing a large inrush current at the moment the switch is turned on.1. 1° which is what you try to avoid doing! 1-, the present inventions i, j: . . . 2 are intended to be realized by a single wire of the switch circuit.

That is, in the present invention, a series impedance consisting of a resistor, a capacitor, and a coil and a current transformer are provided in series with the current main line of an incandescent light bulb, and the secondary electromotive force of the current transformer is expressed as II.
It is supplied to the gate electrode of a semiconductor switch element consisting of a bidirectional conduction circuit, silicon control, and 11 reno switch via a rectifier circuit or a thermistor having a number of JJ, and when the semiconductor switch element becomes conductive, Structure 1 of an inrush current reduction device for an incandescent light bulb, characterized in that the series impedance is short-circuited after a certain period of time has passed from switch-on; , a series impedance consisting of a capacitor and a coil, and a current transformer are provided, and the transformer υ11. An inrush current reduction device for an incandescent light bulb, characterized in that the secondary electromotive force of the lamp is supplied to a relay circuit &C with a time constant, and the relay contacts short-circuit the series impedance after a certain period of time has passed from switch-on. The gist is the structure of

Next, to explain the present invention according to the illustrated embodiment, the circuit shown in FIG. It is a connected circuit.

In this circuit, when the switch S is closed, current flows through the primary side of the current transformer CT, and an electromotive force of several volts is generated on the secondary side, which is rectified by the diode D and transferred to the capacitor C.
It is charged to □. When the charge of this capacitor C reaches a certain value, it passes through the resistor I (□) to the bidirectional conduction thyristor D
Applied to the gate of R, bidirectional conduction risk DC1%
becomes conductive, and the series resistance R is short-circuited.1°Here, if the light bulb Z is turned on at 100 watts, the resistance of the IL bulb Z at room temperature is less than 10 ohms, so the series resistance R is short-circuited. By setting it to 100 ohm,
The current flowing through this circuit is approximately 1 ampere, which is the normal current value of a 100 watt light bulb.

In addition, this +1. :4', the voltage drop across the current transformer CT at vc is ignored.

Because of this, a current of about 1 ampere is flowing at the moment the switch S is turned on, but as the bulb Z is turned on and the temperature rises, the current value decreases. However, when 1/10 second or so elapses after the switch is turned on, the bidirectional conductive thyristor 1) becomes conductive, and the series resistor (2) is therefore short-circuited and all electricity is applied to the bulb Z.

The current curve showing the current flow in step 11 is in the state shown by the solid line in Figure 2, where a current of 1 ampere flows from the moment the switch is turned on, and the inner series resistor It is short-circuited at the two arrow points. Although the current temporarily increases in order to
- the flow of current when connecting the power supply 100 ports to the bulb Z indirectly without using a series resistance)
As shown by the dotted line in Figure 2, the flow curve is approximately 14 amperes per switch-on period. ii'
occurs, and approximately 1/10 second later, the steady current value becomes 1 ampere.

The circuit shown in Fig. 3 rectifies the secondary fill electromotive force of the current transformer c'F through a resistor R1 with a diode D, and after a period of time, current flows through the relay coil L□, and the series resistor R is connected through the contact s1. This is an attempt to short circuit.

The circuit shown in Figure 4 uses a capacitor C instead of a series resistor R.
The value of R = 8': I/2πfc (where f is the power supply frequency and C is farad) is the value of the series resistance R
The aim is to obtain the same effect by setting almost the same value as .

The circuit shown in Figure 5 uses a coil L instead of the series resistor R, and the same effect can be obtained by setting the value of Rf:L2π1° (where L is inductance) to approximately the same value as the series resistor R. This is what we are trying to do.

The circuit shown in FIG.
The gate electrode signal voltage of the bidirectional conduction thyristor DCR is made conductive after a certain period of time from switch-on by using an element such as a thermistor whose resistance value decreases over time. The circuit shown in FIG.
The secondary side electromotive force of the current transformer CT is controlled using two It2. Also, nerikon fli
Control rectifier S CR gate circuit switches S1, S2
Single-wave conduction or double-wave conduction can be freely selected by opening and closing.

[Brief explanation of drawings]

The figure shows an embodiment of the present invention, and in FIG. 1, a series resistor of a current main line, a current transformer, and a light bulb are connected in series. A basic circuit diagram explaining how to short circuit a resistor using a triac V. Figure 2 shows the current flow state.
1: vf+', curve diagram, Figure 3 is a circuit diagram in which the short circuit of a series resistor is connected to the relay's REM 1-', Figure 4 is a circuit diagram in which a capacitor is used instead of a series resistor, Figure 5 is a circuit diagram in which a capacitor is used instead of a series resistor. The figure is a circuit diagram in which the coil is changed to 11 resistors and the coil is connected to the 6th one.
Figure 1.11, a circuit diagram with a constant number of thermistors, Figure 7C, silicon 1lill rectifier 2: (2
FIG. 1 The symbols in the figure are explained as follows. AC is a transformer power supply R is a series resistor C is a capacitor L is a coil CT is a current transformer D is a diode DCR is a thermistor for a bidirectional conduction thyristor SCR is a silicon controlled rectifier Procedural amendment Written by Kazuo Wakasugi, Commissioner of the Japan Patent Office, dated July 15, 1982■, Minor case indication Patent application No. 89838, filed in 1989 2 Title of invention Inrush current reduction device for incandescent' light bulbs: 3 Amendments made. Item 5 of [Details of the invention, Y411 description] of the subject specification of Noru person! Insert the legal text on the next line. [As shown above, the device of the present invention can effectively prevent inrush current when switching on, By changing the circuit constants as appropriate, without setting any limitations on the Ichikawa frequency of commercial AC power supplies or the ratings of incandescent light bulbs, it is still possible to use light sources that use incandescent light bulbs, such as street lights, gate lights, and lobbies of buildings such as hotels. A light source for controlling the physiological state of animals and plants enclosed in quartz glass or borosilicate glass tubes, such as a light source for adjusting the laying period of poultry, a light source for adjusting the flowering period of plants, and even for high-speed cameras. It can be used freely for light sources for various purposes such as light sources, light sources for microscopes, various light sources in vehicles such as automobiles, advertising lights, signal lights, etc.

Claims (2)

[Claims] (1) A series impedance and a current transformer are connected in series with the main current line of an incandescent light bulb, and the series impedance is changed after a certain period of time has passed from the switch on due to the second order 1 law of the current transformer. An inrush current reducing device 1/1'' for an incandescent light bulb, characterized in that it is configured to short-circuit. (2) A series impedance and a current transformer are installed in series with the current main line of the incandescent light bulb, and a rectifier circuit or thermistor is used to convert the secondary force of the current transformer into 14 rectifiers or thermistors. The gate of the semiconductor switch element is supplied to the gate of the semiconductor switch element through series impedance
Scope 1 of Patent No. 5111, characterized in that the inrush current reducing device for incandescent light bulbs described in "1")j is characterized in that the devices are connected in series to the main current line of incandescent light bulbs. An impedance and a current transformer are provided, and the secondary electromotive force of the current transformer is supplied to a relay circuit having a time constant, and the series impedance is short-circuited after -i lRr has elapsed from switch-on by the contact of the relay. An inrush current reducing device for an incandescent light bulb as set forth in item 1 of the scope of patent MFJ, characterized in that: