Published:2011/4/19 21:38:00 Author:Ecco | Keyword: motor vehicle , headlight, auto-dimming , controller | From:SeekIC
The motor vehicle headlight auto-dimming controller described in the example can work alternately between the state of 1·9S high beam and low beam when driving at night. It will automatically become low beam when meeting other cars, it has a better dimming effect.
he working principle.The vehicle headlight auto-dimming controller circuit consists of voltage regulator, light control amplifier, and controlling implementation of the multivibrator circuit, the circuit is shown as the figure 7-6.
The voltage regulator circuit consists of three-terminal voltage regulator integrated circuit IC4, diode VD2 and filter capacitor C2.
The light control amplifier is composed of photocell GB, operational amplifier integrated circuit ICl (Nl-N4), IC2 (N5), resistors Rl-R8 and potentiometer RPl, RP2.
The multivibrator circuit is composed of time-base integrated circuit IC3, resistors R9, RlO, capacitors Cl, C3.
The controlling implementation is composed of resistors Rll, the transistor V, Relay K and diode VD3.
Rl-Rll choose 1/4W metal film resistor or carbon film resistors.
RP1 and RP2 choose sealed membrane variable resistors.
K selects a l2V JRX-l3F DC relay.
Gb selects small-capacity silicon photovoltaic cell.
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