SU482855A1 - Device for regulating the voltage of the DC generators - Google Patents

Description

one

The invention is intended to control the voltage of DC generators used in conjunction with batteries as stand-alone sources of electricity.

A device for regulating the voltage of direct current generators is known, which contains a semiconductor device that requires special means that prevent the battery from discharging to the field winding while the generator core is stationary. A disadvantage of this device is that the use of special switches increases the number of connecting wires, complicates the operation of power supply systems, reducing their reliability.

The aim of the invention is to prevent the discharge of a battery by non-contact means.

This goal is achieved in that a semiconductor switch is inserted in series with a resistor at the base of the power transistor connecting the field winding to the battery, the state of which, conductive or non-conductive, depends on the voltage on the core of the adjustable oscillator.

The drawing shows a schematic diagram of the proposed device.

The device contains measles 1 generator excitation winding 2, battery 3, reverse and shunt diodes 4 and 5, power and measuring transistors 6 and 7, potentiometer 8, zener diode 9, control transistor 10, limiting resistor 11.

The device works as follows.

In the initial position with the generator core 1 stationary, the voltage at its terminals is absent and the transistor 10 is locked. Transistors 6 and 7 are also in a non-conducting state, since their base circuits are de-energized. In this case, the battery consumes only the current determined by the initial currents of the closed transistors and the reverse current of diode 4.

When starting the generator at the terminals of the core, a voltage appears due to residual magnetization. As a result, the transistor 10 goes into a conducting state and, via potentiometer 8, causes the transistor 6 to open. The current in the field winding increases. This leads to an increase in stress on the cortex — the process develops like an avalanche. As a result, transistors 10 and 6 are in the saturation state, the field winding is connected to the battery, and the generator voltage at a corresponding rotational speed reaches the nominal level. In this case, the Zener diode 9 breaks down, the transistor 7 is unlocked and, consequently, the transistor 6 is locked. The current in the excitation winding begins to decrease and is subsequently maintained at the level corresponding to the rated value of the controlled voltage.

When the generator is stopped, the voltage on the core 1 decreases to "zero, as a result of which the transistor 10 goes into a non-conducting state and ensures the excitation of the excitation winding 2 (and the regulator as a whole) from the battery 3.

Subject invention

Claims (2)

1. A device for controlling the voltage of a DC generator operating in conjunction with a battery, comprising a transistor connected between the field winding and the battery, a resistor in its base circuit and a measuring element, characterized in that, in order to prevent the battery from discharging The excitation winding with a stationary crust of the generator, in series with the resistor, is inserted a key element connected to the core circuit of the generator via the control input. 2. The device according to claim 1, characterized in that the key element is made on a transistor, an emitter and. the base of which is connected to the core of the generator through a limiting resistor.