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Dimming / Voltage conversion with Multivibrator PWM for 24V boardnet cars

IP.com Disclosure Number: IPCOM000183347D
Publication Date: 2009-May-19
Document File: 2 page(s) / 35K

Publishing Venue

The IP.com Prior Art Database

Abstract

ID294605

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Dimming / Voltage conversion with Multivibrator PWM for 24V boardnet cars

Some cars, like Trucks, using a 24V boardnet voltage have sometimes difficulties to find suitable light bulbs. A possible solution consists in using 12V light bulbs on a 24V boardnet. Of course, for practicality, such solution should be very simple with as small a number of components as possible.

Also, this same method can be used for dimming light bulbs on 12V/24V boardnet.

A specific solution for this is proposed here, while an alternative might consist in using PWM voltage regulation, but which needs coils or more components.

Problem:
24V bulbs for DRL do not fulfill vibration resistance, and lifetime requirement. Solution / proposal: use 12V bulbs with easy, cheap, small PWM module with few components for voltage conversion.

We propose these solutions;
-down conversion 24V(28V)/36V(42V) to 12V(14V) using small and simple PWM module connected to car boardnet to the bulbs.

Item can be:
- down conversion using electric circuit below (see Figs.)
- down conversion using electric circuit without filter function , e.g. coil and/or capacitor and/or resistor.

36V (42V) to 12V using module connected to car boardnet to the bulbs with using duty cycle 5-50% (depends on input voltage range and target voltage range)

Example circuit (see below). Part of the circuit is very similar to a...