Electronic flasher relay
Electronic type flasher relay structure:
Composed of a transistor switching circuit, capacitor and a relay.
The working principle of electronic type flasher:
Electronic flasher using triode switch characteristics, capacitor charge, discharge time delay characteristics, control relay coil, power outages, connecting and disconnecting the contact, so that the steering signal lamp flashing.
Electronic flasher due to its reliable operation, long service life, present in the automobile steering lamp system widely used in.
Electronic flasher is divided into contact and contactless integrated circuit and a transistor, etc.. Electronic flasher three pins: B: L: power end; flasher control end; E: ground terminal; and a charging circuit: battery power switch SW to terminal B V emitter, base of E B C R3 capacitor resistor terminal S steering lamp switch K right turn signal lamp ground battery cathode. Auto turning to the right, when the power switch SW and a steering lamp switch K, current from the positive terminal of the battery B resistance R1 normally closed contacts of the relay J to terminal S steering lamp switch K right steering lamp ground battery negative electrode, forming a loop, a right turn signal light.
When the current through the resistor R1, in a resistor R1 produces a voltage drop, three pipe VT for forward bias and conduction, collector current through the coil of the relay J, the normally closed contact of the relay is immediately opened right turn signal lamp is extinguished.
Crystal triode V conducting at the same time, V base current to the capacitor C charging. In charge process, with the capacitor charge accumulation, the charging current is reduced gradually, the transistor collector current Ic is also decreased, when the current is sufficient to maintain an attracting and releasing, a contact of the relay is closed again, turning lights shine again. When the capacitor C through a resistance R2, a normally closed contact of the relay J, R3 discharge resistance. Discharge current in R2 to generate a voltage drop for the transistor to provide a reverse bias, accelerated transistor cutoff. When the discharge current is zero, the voltage drop on R1 for triode with positive bias voltage to the conduction.
Thus, continuous charging and discharging capacitor, transistor will continue on and off, the control relay contact repeatedly opened, closed, so that the steering lamp flicker.
参考资料来自传奇商城
