SU575755A1 - Device for electric power supply of autonomous objects - Google Patents

Description

(54) DEVICE FOR POWER SUPPLY OF AUTONOMOUS OBJECTS

The invention relates to electrical engineering, in particular, voltage regulators operating in conjunction with alternators, such as autotractors, the winding of which is connected in a star.

Devices are known for powering autonomous objects 1, 2.

Generator sets are known in which the generator excitation winding circuit and the regulator regulator are connected between the zero point of the generator stator and "mass (minus) 1.

The closest technical solution to the invention is a device for powering autonomous objects, containing an electric AC generator with a rectifier in the stator winding circuit, to the zero point of which a control transistor power circuit is connected to the zero point, which includes a vibration relay through a thermocompensation resistor is connected to the output of the indicated rectifier, and the relay is protected against a short circuit of the excitation winding, the winding of which is connected and by regulating the collector of transistor 2.

A disadvantage of the known device is that the vibrating contacts of the vibration control relay, the service life of which mainly determines the duration of the contact-transistor controller operation, work here in a heavy mode in the high voltage circuit.

In addition, in this device, by incorporating the main winding of the protection relay into the collector circuit of the transistor, the voltage drop across the field winding increases, which degrades the technical characteristics of the generator.

The aim of the invention is to increase the reliability of the device.

This goal is achieved by the fact that in the proposed device for the power supply of autonomous objects the closing contacts

vibration and protection relays are connected between the zero point of the stator winding and the base of the regulating transistor.

The drawing shows a schematic diagram of a device for powering autonomous objects.

The device contains a generator of fixed current 1 with a rectifier 2 in the stator winding circuit 3, to the zero point 4 of which, via diode 5, is connected to the power circuit of the regulating transistor b, into which the winding is connected

arousal 7; a vibration relay 8 with a closing 9 and a disconnecting 10 contacts, the winding of which is connected via the temperature compensation resistor 11 to the output of the rectifier 2; protection relay 12 with the closing contact 13 connected between the zero point 4 and the base of the regulator of the transistor 6; the resistor 14 feed winding of the excitation 7 generator 1; the base resistance 15 of the transistor 6 and the chain of flexible feedback, consisting of a resistor 16 and a diode 17.

The device works as follows.

When applying voltage from the battery to the plus-to minus terminals until the device trips (when the generator reaches a voltage level corresponding to the adjustable one), the electromagnetic force of the winding of the vibration relay 8 is not enough to attract the core of the driving relay, the contacts 9 of the vibration relay are open.

In this case, the transistor is open, since there is an emitter-base junction current (base current) defined by resistance 15. The transistor is in the saturation zone of the output characteristic. In this case, the resistance of the emitter-collector junction of the transistor is minimal.

When the generator reaches a voltage level corresponding to the regulated one, the magnetising force of the winding of the relay 8 closes the contacts 9, the contacts 10 open.

In this case, the transistor is locked, since its base is connected by contacts 9 with the zero point of the circuit, and at the emitter the potential will be lower than the potential of this point by the amount of voltage drop across diode 5 connected to the emitter circuit.

The voltage drop across the diode 5 is due to the current consumed by the device when the transistor 6 is in the closed state. The voltage drop across the diode 5 causes the transistor to be actively locked, ensuring its reliable operation in conditions of elevated ambient temperature.

When the transistor is locked, the excitation current drops, the generator voltage decreases. The magnetizing force of the winding of the relay 8 drops, causing the contacts 9 to open (contacts 10 close), and the process repeats.

The adjustment of the required level of the average excitation current in the operating range of the generator occurs due to a change in the ratio of the time of the closed and open state of the excitation winding circuit when the contacts of the vibration relay are working. When the vibrating relay contacts operate, a small transistor control current is switched.

The protection relay against short circuits in the excitation winding circuit operates as follows.

When any of the points in the excitation winding circuit is shorted to ground, the excitation winding 7 is shunted, and the generator voltage drops sharply.

Under the action of the magnetizing force of the winding of the protection relay 12 connected in the circuit of the contacts 10, the contacts 13 of the protection relay are closed, the base of the transistor 6 is connected to the zero point of the circuit, the transistor is locked.

After the causes of the short circuit are eliminated, the contacts 13 of the protection relay open and the regulation is carried out as usual.

Claims (2)

1. USSR author's certificate No. 474895 m. H 02 R 9/30, 1973. 2. USSR author's certificate № 315244 m. H 02 H 7/06, 1968.