JPH0494097A - Inverter for halogen lamp - Google Patents

Abstract

PURPOSE:To turn on a halogen lamp without reclosing the switch to carry AC by installing a reset switch in a protection circuit. CONSTITUTION:At an inverter for a halogen lamp having a protection circuit which is equipped with a paper of transistors 1, 2, detects mislighting of a lamp and an abnormal condition, makes the oscillation of the transistors 1, 2 stop, and a lighting operation stop and to be held, reset switches 4, 5 are installed. It is thereby possible to reset the protection circuit in such a state that a current is flowing and to turn on a halogen lamp 11 without again putting the power supply to work after protection operation through the protection circuit, and also to easily carry out the maintenance of the halogen lamp 11 when a plurality of lamps are used through the same wiring.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an inverter device for a halogen lamp.

[Conventional technology]

In a conventional inverter device for a halogen lamp, in order to prevent burns caused by the heat of the halogen lamp, a protection circuit of the device keeps the lamp in an off state even if the lamp is replaced after the AC (power supply) is turned on.

[Problem to be solved by the invention]

In the above-mentioned conventional technology, in order to turn on the light again after the protection circuit operates, the AC must be turned on again and the protection circuit must be reset.

The present invention has been made in view of the above points, and an object of the present invention is to provide an inverter device for halogen lamps that allows easy maintenance of halogen lamps when multiple lamps are used with the same wiring. It is.

[Means to solve the problem]

The above object is achieved by providing a reset switch in the protection circuit.

[Effect]

Since the above means is provided, the protection circuit is reset in the energized state, and the halogen lamp can be lit without turning on the power again after the protection operation by the protection circuit.

〔Example〕

The present invention will be explained below based on the illustrated embodiments. FIG. 1 shows an embodiment of the invention. In an inverter device for a halogen lamp, which includes a pair of transistors 1.2 and an output transformer 3, and has a protection circuit that detects lamp failure or an abnormal state and stops oscillation of the transistor 1.2 to stop and maintain lighting operation. In this embodiment, a reset switch 4.5 is provided in the protection circuit. By doing this, the protection circuit is reset when the power is on, and the halogen lamp 11 can be turned on without having to turn on the power again after the protection operation by the protection circuit. Thus, it is possible to obtain an inverter device for a halogen lamp that makes it possible to easily maintain the halogen lamp 11 when a plurality of lamps are used.

That is, when an AC voltage is applied to this circuit, it is rectified by the diode stack 6, and is connected to the capacitor 8 via the resistor 7.
When the charging voltage rises to the switching voltage of 5BS9 connected to capacitor 8, 5B
S9 suddenly turns on, and the charge stored in capacitor 8 is applied to the base of transistor 1, turning transistor 1 on.

Transistor 1 is turned on, and the charge in capacitor 10 flows to transistor 1 via primary winding 3a of output transformer 3. Thereafter, when the transistor 1 is turned off, the voltage across the negative winding 3a is reversed due to the inductance of the primary winding 3a, and the transistor 2 is turned on by the base winding 3b of the ratio quadrature 3. The above-described operations are repeated to turn on the halogen lamp 11.

In this embodiment, in such an inverter device for a halogen lamp, when the load is short-circuited or overloaded, the current transformer 12 is used to detect the lamp current, the current is converted to voltage by the resistor 13, and the capacitor 14 is The capacitor 8 is charged and the transistor 15 is turned on to prevent the capacitor 8 from being charged.

At this time, or when the load is released, the transistor 16 is turned off, and the Zener diode 17 turns on the transistor 15 to stop oscillation. After that, transistor 1
5 is for maintaining the energized state.

The stopped state is maintained because the voltage of the capacitor 8 does not rise and there is no voltage to turn on the transistor 1.

When performing such a protective operation, the AC had to be turned on again, but by providing the reset switch 4 or 5, it becomes possible to turn off the transistor 1 and turn on the halogen lamp 11 again.

As described above, according to this embodiment, even if the protection circuit operates after AC is turned on, by providing a reset switch, the halogen lamp can be turned on without turning on AC again.

〔Effect of the invention〕

As mentioned above, the present invention provides a halogen lamp that facilitates the maintenance of halogen lamps when multiple lamps are used with the same wiring, and that makes it possible to easily maintain the halogen lamps when multiple lamps are used with the same wiring. It is possible to obtain an inverter device for use.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of an embodiment of an inverter device for a halogen lamp according to the present invention. 1.2...Transistor (pair), 3...Output transformer, 4.5...Reset switch, 11...Halogen lamp.

Claims (1)

[Claims] 1. A halogen lamp inverter device comprising a pair of transistors and an output transformer, and having a protection circuit that detects lamp failure or an abnormal state and stops oscillation of the transistor to stop and maintain lighting operation, wherein the protection circuit An inverter device for a halogen lamp, characterized in that a reset switch is provided in the inverter device.