JPS5920738A - Lightening apparatus of vehicle - Google Patents

Abstract

PURPOSE:To standardize products with respect to the windings of generating coil, by cutting an alternating current generated by a generating coil of a magneto that has exceeded a prescribed value thereby suppressing the amount of heat generated by the generating coil. CONSTITUTION:A controller 24 controls conductive angle of thyristors 20, 22 at every half wave of the generated voltage and the thyristors 20, 22 are made conductive or cut so that a voltage equal to a prescribed value is applied to a lamp 12. Therefore, if a pulsating voltage, for example, having a maximum of 30-50V is energized to the lamp 12, since the lightness of the lamp 12 is kept approximately at the same level as in the case that a battery 14 has an ability for charging, a switching regulator 26 is actuated so that a voltage equal to a prescribed value is added thereto. That is, by interposing the thyristors 20, 22 between the coil 10 and the lamp 12 in series and by cutting an excess electric current so that the lamp voltage does not exceed a prescribed value, it will not flow into the coil 10 as a short-circuit current thereby preventing the coil from heating, and thus the type or diameter of the wires of the winding can be made standardized.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lighting device for a vehicle that adjusts a lamp voltage by controlling an alternating current voltage generated by a generating coil of a magnet generator using a switching element.

Conventionally, in such devices, the above-mentioned adjustment is performed by short-circuiting the generating coil for the portion of the generated current that exceeds the lamp voltage by a predetermined value, causing excessive heat generation in the generating coil. For this reason, when manufacturing a power generation coil, it is necessary to take into account the heat generated when the rotational speed of the internal combustion engine is high, and change the wire type, wire diameter, and number of turns of the winding wire wound around the power generation coil for each vehicle model. This made it difficult to standardize products.

Shio's invention is a product for a winding wire wound around a power generation coil, which suppresses the amount of heat generated in the power generation coil by cutting off the alternating current generated by the power generation coil that exceeds the predetermined value. An object of the present invention is to provide a lighting device for a vehicle that can unify the following.

In order to achieve this object, the present invention inserts a switching element in series between the power generation fill of the magnet generator and the lamp to conduct or cut off the circuit between them, and the switching element is connected to the power generation coil. A control device is connected which controls the conduction angle of the element in accordance with the output so as to keep the input of the lamp constant.

Hereinafter, this invention will be explained in detail according to an embodiment shown in the drawings.

FIG. 1 is a circuit diagram of an embodiment of the invention. This embodiment will be described as applied to a motorcycle. In Figure 1,
Reference numeral 10 is a power generation coil of a magnet generator that generates power according to the number of revolutions of the crankshaft, 12 is a lamp such as a headlamp, and 14 is a battery connected in parallel to this lamp 12. 16.18 is the power generation coil 10
The first . These diodes 16 and 18 are the second diodes 16 and 18, respectively, at both ends A of the generating coil 10.

B and the connection point C. 20°22 is the first. These two thyristors 20, 22, which are second thyristors, are inserted in series between each end A, B of the generating coil 10 and the other connection point between the lamp 12 and the battery 14. 24 is
This control device 24 controls the conduction angle of the two side risks 20.22, and this control device 24 sends a control signal to each gate of the two side risks 20.22 based on the output from the diode 16.18. It is composed of In this example, the first. second diode 1”'6,
18 and @1. The second thyristor 20° 22 and the control device 24 constitute a switching regulator 26.

Next, the operation of this embodiment will be explained.

First, if the battery 14 has a charging capacity, the lamp 12 is turned on by a DC waveform voltage (for example, 12V) shown in FIG. 2 ( ). That is, 1st. Second
During the conduction period of the thyristor 20.22, the first. A part of the generated current rectified by the second diode 16.18 flows into the battery 14 through the current path shown by the solid line I and the broken line H, and while this battery 14 is charged, the generated current is lower than the predetermined value. The insufficient amount flows into the lamp 12 from the battery 14, and the lamp voltage of the lamp station 2 is adjusted to a predetermined value by the battery 14. Next, when the connection between the battery 14 and connection point C or D is cut off, or when the battery 14 is fully charged, the battery 12 smoothes the rectified generated voltage. Therefore, the generated voltage is applied almost directly to the lamp 12. That is, in this embodiment, the control device 24 in the regulator 26 controls the first . Second thyristor 20
．． The conduction angle of the planar thyristor 20.22 is controlled so that the same voltage as the predetermined value is applied to the lamp 12.
Conducts and interrupts. The shaded portion in FIG. 2(2) is the voltage waveform applied to the lamp 12 due to the conduction angle control. As a result 8, even if a pulsating voltage with a maximum value of 307/v50 V is applied to the lamp 12 as shown in FIG. In order to maintain the brightness of the lamp 12 at the same level,
The switching regulator 2 is applied to the lamp 12 so that a voltage equal to the predetermined value in terms of average voltage is applied to the lamp 12.
6 will work. In this way, both Sai Risk 2
0.22 is inserted in series between the generator coil 10 and the lamp 12, and both thyristors 20 and 22 cut off excess current so that the lamp voltage does not exceed a predetermined value, and the excess current is passed to the generator coil 10 as a short-circuit current. It never flows.

In this embodiment, the four lamps 12 can be lit at a constant brightness with direct current due to the presence of the battery 14, while a constant average voltage is applied to the lamps 12 even when the pantry 14 is not provided. .

As explained above, according to the present invention, a switching element whose conduction angle is controlled by a control device is inserted in series between the generating coil and the lamp, and this switching element allows the switching element to be connected between the generating coil and the lamp. Since the circuit is made conductive and cut-off, the part of the alternating current generated by the generator coil that exceeds a predetermined voltage can be interrupted without short-circuiting the generator coil, which reduces the voltage to the lamp. This eliminates the need for the generator coil to generate excessive heat in order to adjust the power to a predetermined value, and this eliminates the need to change the wire type and wire diameter of the winding wound around the generator coil for each model, allowing product unification. Effects such as being able to achieve the desired results will be demonstrated.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram of an embodiment of the present invention, and Fig. 2 is a lamp voltage waveform diagram for explaining its operation. ',, lamp, 1411. battery,
16.18. ,, 1st. second diode, 20, 22.
,, 1st. second thyristor, 243. control device, 26.
,, switching regulator output 11. [4 people Yamaha Motor Co., Ltd. agent Patent attorney Kazuhide Okada

Claims (1)

[Claims] (1) A switching element is inserted in series between the generating coil of the magnet generator and the lamp to conduct or interrupt the circuit between them, and the conduction angle of the switching element is set according to the output of the generating coil. A lighting device for a vehicle, which is connected to a control device that controls the lamp, and is configured to maintain a constant input to the lamp.