JPS6322637Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a device for turning on and off fluorescent lamps that are operated with direct current and are used in buses and other vehicles.

Conventionally, in a fluorescent lamp such as a bus using a storage battery as a power source, the amount of light has been adjusted by switching a capacitor C or a chiyoke coil inserted in a discharge current supply circuit as shown in FIG. Dimmer A and power switch B are installed separately on a switch panel near the driver's seat, requiring a large switch panel to be installed in an already small space, and on top of that, each light has its own switch and dimmer. There was an operational inconvenience in that the device had to be operated. Furthermore, because the dimmer and power switch are separate, the setting position of the dimmer is undefined when the switch is turned on, and if the power is turned on in a dimmed state, the fluorescent lamp will not turn on. Ta.

In order to eliminate these drawbacks of conventional products, the present invention integrates the flashing switch and dimmer to save space and improve operability, and also prevents the light from dimming when the switch is turned on. The present invention has realized a vehicle fluorescent lamp device that lights up reliably. Next, the configuration will be explained using a circuit diagram of an embodiment.

Reference numeral 1 denotes a storage battery, and 2 an inverter circuit for converting direct current into high-frequency alternating current, which is composed of a transistor 3, a bias resistor 4, and an oscillation coil 6 of a step-up transformer 5. The output side of the step-up transformer 5 is connected to a heater transformer 10 via a choke coil 9.
Connecting the secondary coils 11, 11' of the heater transformer 10 to the heaters at both ends of the fluorescent lamp 12,
Connect one end of one heater to 1 of heater transformer 10.
It is connected to one end of the primary coil 13, and one end of another heater is connected to the other end of the primary coil 13 via a switching circuit 14 constituted by an SCR.

A pulse oscillator 15 is provided separately from the above, and a pulse signal from the oscillator 15 is input to the switching circuit 14.
The pulse width is controlled by a variable resistor 1.
The power supplied to the fluorescent lamp 12 is adjusted by controlling the variable resistor 18 with the switch 17. The variable resistor 18 is equipped with a switch 17, and the power circuit is turned on and off and the luminous intensity is adjusted by a single axis operation. Moreover, the variable resistor 18 is connected to the pulse oscillator 15 so that the fluorescent lamp 12 is at its brightest immediately after the switch 17 is turned on, that is, so that the power supplied to the fluorescent lamp 12 via the switching circuit 14 is maximized. When there are a large number of fluorescent lamps to be controlled, the power is opened and closed via a relay 19 having a required current capacity in order to increase the switch capacity.

Next, the operation of the present invention will be explained. When the variable resistor with switch 16 is operated and the switch 17 is turned on,
The connection position of the variable resistor 18 is set at the position where the output pulse width from the pulse oscillator 15 is maximum. When the switch 17 is turned on, current flows through the relay coil 21, closing the relay contact 20 and generating the pulse oscillator 1.
5 and the fluorescent lamp device 22 from the storage battery 1 . In the fluorescent lamp device 22, an inverter circuit consisting of the transistor 3, the oscillation coil 6 of the step-up transformer 5, and the bias resistor 4 oscillates to generate a high frequency, and the fluorescent lamp 1 is connected to the secondary coil 8 of the step-up transformer 5.
Induces the high voltage necessary to light the light. This voltage is passed through the electric coil 9 to the heater transformer 10.
The current is applied to the coil 13 to heat the heater of the fluorescent lamp 12, and is also applied to the fluorescent lamp 12 via the switching circuit 14. At this time, the pulse oscillator 15 controls the opening and closing of the switching circuit 14 by outputting the maximum pulse width, so that the power supplied to the fluorescent lamp 12 is maximized, and the fluorescent lamp 12 is reliably lit. Furthermore, when the variable resistor 16 with a switch is operated in the same direction as the closing direction of the switch 17, the connection position of the variable resistor 18 changes while the closed state of the switch 17 is maintained, and its resistance value changes. As the output pulse width from the pulse oscillator 15 becomes smaller, the switching circuit 14
As the power supplied to the fluorescent lamp 12 decreases, dimming is performed. Therefore, failure in lighting when the switch 17 is turned on will not occur. That is, by turning on the switch 17, the fluorescent lamp 12 is reliably turned on, and then the variable resistor 18 is gradually turned to adjust the brightness to the desired brightness.

As mentioned above, the present invention uses a variable resistor with a switch, and has a structure that skillfully avoids turning off when the switch is turned on, making it possible to blink and adjust the brightness of a fluorescent lamp. In addition to reducing the size of the operation panel and simplifying operations, the system also improves the reliability of lighting, which has great practical effects.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of a conventional vehicle fluorescent lamp device, and FIG. 2 is a basic circuit diagram of the present invention. 2... Inverter circuit, 5... Step-up transformer, 1
0...Heater transformer, 12...Fluorescent lamp, 14...
...Switching circuit, 15...Pulse oscillator, 1
6... Variable resistor with switch, 17... Switch, 18... Variable resistor, 19... Relay, 22
...Fluorescent lighting equipment.

Claims (1)

[Scope of utility model registration request] Inverter circuit 2 converts DC power from the on-board storage battery into inverter circuit 2
and converted into high frequency AC power by step-up transformer 5,
The converted output is applied to the heater transformer 10, the two outputs from the heater transformer 10 are applied to the heaters at both ends of the fluorescent lamp 12, and the high frequency AC power from the step-up transformer 5 is applied to the heaters at both ends of the fluorescent lamp 12. In an inverter-type vehicle fluorescent lamp device that lights up a fluorescent lamp by applying an electric current between them, a switching device has two semiconductor devices connected in antiparallel to one side of a discharge current supply circuit so that current flows in both directions. With the circuit 14 interposed, the switching circuit 14
By controlling the pulse oscillator 15 provided separately, the power supplied to the fluorescent lamp 12 is controlled and the luminous intensity of the fluorescent lamp 12 is adjusted. 16 is used to operate the dimming and blinking of the fluorescent lamp 12 on one axis, and the variable resistor 18 is connected to the pulse oscillator 15 at the position where the pulse width in the pulse oscillator 15 is maximized when the switch 17 is turned on. Fluorescent lighting device for vehicles.