Vehicle lighting device

摘要

The present invention provides a vehicle lighting device that can set a wide output current without replacing a component such as a coli. An output current setting device 7 sets an output current setting signal 8 in such a manner that an output current 5 in accordance with a luminous flux of an LED 2 is outputted. The output current setting signal 8 is supplied to a frequency adjusting component 3a and an output current detecting component 3b. The frequency adjusting component 3a generates a triangle wave of a frequency based upon the output current setting signal 8, and supplies the triangle wave to an output adjusting-signal generating component 3c. The output adjusting-signal generating component 3c compares the triangle wave with a signal voltage that is outputted from the output current detecting component 3b to generate an output adjusting signal 6, which is supplied to a switching element 30.

主权项

1. A vehicle lighting device comprising:
a load that is operable by a current; a power conversion component configured to convert a direct-current power that is inputted and to supply the converted output current for output to the load, and to output an output current signal based upon the output current; an output current setting device configured to output a set output current setting signal; a frequency adjusting component configured to output a frequency signal of a frequency based upon the output current setting signal that is inputted; an output current detecting component configured to compare a reference voltage based upon a voltage generated and the output current signal, employing the output current setting signal that is inputted, and to output a signal voltage; an output adjusting-signal generating component configured to compare the frequency signal and the signal voltage that are inputted, and to output an output adjusting signal; an output control component configured to supply the output adjusting signal to the power conversion component, wherein the frequency adjusting component is configured to set a low frequency in a case where the output current is set as large, and to set a high frequency in a case where the output current is set as small; and switch changing components each configured to provide an ON or OFF signal based on the output current setting signal, wherein the frequency adjusting component is configured to set a frequency based on frequency changing switches of the frequency adjusting component which are set based on the ON or OFF signals from respective of the switch changing components.