SU927592A1 - Device for producing intermittent light signals - Google Patents

Description

(5) DEVICE FOR RECEIVING PERIODIC LIGHT SIGNALS

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The invention relates to electrical equipment of vehicles and can be used to produce periodic light signals of direction indicators.

A device for half-light of periodic light signals is known, which contains a power amplifier at a transistor, in the collector circuit of which signal lamps connected to the minus power supply bus are connected via a switch and an emitter follower to the base circuit and a capacitor connected in parallel with the base-emitter-emitter follower transition l.

However, the known device for producing periodic light signals is not sufficiently reliable due to the absence of inrush current limitation through signal lamps.

The closest to the invention to the technical essence and the achieved result is the device

to receive periodic light signals containing a power amplifier at the transistor, in the collector circuit of which, through a switch, signal lamps connected to the negative terminal of the power supply are turned on, and emit- to the main circuit. ternary repeater, and parallel to the input of which is connected condensate-. torus and parametric stabilizer

10 voltage connected by the output through one of the resistors to the emitter follower input 12.

However, this device does not provide control of the signal

IS lamps and not sufficiently reliable due to the use of an electromagnetic relay with a contact group to reduce the starting currents of the lamps.

The purpose of the invention is the expansion

10 features and increased reliability.

This goal is achieved by the fact that the device is equipped with a key transistor, an additional photodiode capacitor, a zener diode and an indicator lamp connected in parallel with the emitter-collector junction of the transistor power amplifier, the additional capacitor connected in parallel with the photodiode and through a second resistor connected to the power supply the transistor is connected in parallel to the first conductor; the base-emitter transition of this transistor is shunted by the third resistor and its base is a zener diode connected to the common point Neny Cpd of the photodiode, a second resistor and a capacitor. The drawing shows a circuit diagram for receiving periodic light signals. A device for receiving periodic light signals contains a power amplifier at transistor 1, into the collector circuit of which the signal lamps 3 connected to the power supply minus are connected via switch 2 and the emitter follower k to the main circuit, capacitor 5 connected in parallel to the output of the emitter follower k, parametric a voltage regulator 6 connected by an output through a resistor 7 to an emitter follower input of an indicator lamp 8 connected in parallel with the emitter-collector junction of transistor 1, f todiod 9, Port. connected in parallel with a capacitor 10 connected through a resistor 11 to a power source, a key transistor 12 whose collector-emitte junction is connected in parallel to a capacitor 5 resistor 11. In the initial state of the switch 2, the signal lamps 3 and the indi cator lamp 8 are not hot, the photodiode 9 has a high resistance, the capacitor 10 is almost charged until the voltage of the power supply is stable ron Il is open, the voltage on the base of the transistor 12 maintains its open and discharge the capacitor 5 wives, and a transistor power amplifier 1 is closed. When the switch 2 is turned on, through the signal lamps 3 and the indicator lamp 8, a current begins to flow and the indicator lamp 8 lights up, since the resistance of its glowing filament is greater than the resistance of the threads of the signal lamps 3- This is determined by the power of the lamps. The signal lamps 3 are only heated and thus the resistance of the filaments of the signal lamps 3 increases, which prevents the occurrence of inrush current. The heating mode of the signal lamps 3 can be selected by the optimal introduction of additional resistors connected in parallel with the emitter-collector transition of transistor 1. Sequential switching on of the indicator lamp 8 with signal lamps 3 improves its operation, since the resistance of the threads of signal lamps 3 is limiting for the initial currents of the indicator lamp 8. After the indicator lamp 8 lights up, the resistance of the photodiode 9 decreases sharply as the photodiode 9 is illuminated by the indicator lamp 8 and the capacitor 10 starts discharge through the resistance of the opening photodiode 9. When the voltage on the capacitor 10 reaches below the breakdown voltage of the Zener diode 1, it closes and the transistor 12 also closes, which charges the capacitor 5 through a resistor 7 from the parametric voltage regulator 6; The voltage on the capacitor 5 is transmitted through the emitter. Repeater 4 to the base of the transistor 1 and opens it, and the operating current begins to flow through the signal lamps 3, the signal lamps 3 light up and the indicator lamp 8 goes out as the transistor collector-emitter is bounded by an open junction 1. Photodiode 9 increases its resistance and capacitor 10 begins to charge. When the voltage across the capacitor 10 reaches the voltage of the Zener diode 1A, it opens and the voltage is applied to the base of the transistor 12, which opens and the capacitor 5 begins to discharge through its collector-emitter junction. After the capacitor 5 is discharged, the transistor 1 closes and the operating current through the signal lamps 3 is stopped, the signal lamps 3 go out and the heating current starts to flow through them, which flowed through

indicator light 8, causes it to catch fire. The process repeats in the described cycle as long as switch 2 is in the on state, when translating switch 2 into a neutral application, the device returns to its original state.

The positive effect of the proposed device for receiving periodic light signals is in expanding the functionality and is expressed in indicating the operation of the device, which provides the convenience of controlling its operation from the driver of the vehicle, as well as improving the reliability of the device due to the failure of the device from the electromagnetic relay with the contact group which, under vehicle operating conditions, is a less reliable element. In addition, the presence of two timers in the device allows choosing the frequency of light signals over wide limits with a higher stability of their generation.

Claims (2)

1. Forward Germany FR 23053 6, cl. H 03 K 3/28, 1971. 2. USSR author's certificate V 662393, cl. B 60 Q 1/38, 1977 (PROTOTYPE).