SU1372305A1 - Bipolar supply unit - Google Patents

Abstract

The invention relates to electrical engineering, namely to direct current power sources. The purpose of the invention is to increase the starting reliability by simplifying the starting circuit and reducing overvoltage. The device contains two unipolar voltage regulators 1 and 2. Each stabilizer includes a control transistor 3 (4) and an auxiliary voltage source 5 (6). The regulating transistor of at least one of the stabilizers is connected to one of the power electrodes through the trigger circuit to the polar output of the other stabilizer. The starting circuit consists of a resistor 12 and a diode. In the stabilization mode, the voltage on the elements of the trigger circuit is significantly reduced. 2 hp f-ly, 2 ill. about i (L 6 0

Description

And MSC retenna refers to electrical engineering, specifically to DC power sources,

He.Tfj of the invention is an increase in starting reliability by simplifying the starting circuit and reducing overvoltage.

Fig. 1 shows a circuit diagram of the proposed dual-pole power supply unit with direct connection to the common emitter bus of one of the control transistors; Fig, 2 - the same, with the tapping; tapping to the common bus collectors of both control transistors.

The dual power supply unit has two onHonoJTHpHbix stabilizers 1 and

2 voltages, each of which is made with a control transistor

3 or 4, connected to the power bus in series with the source 5 or 6, with output terminal 7 or 8, intended for connection between this output and the common bus 9 of the stabilizer load, and the comparison node, made with power supply terminal 10 or 11, connected to terminal 7 or

8, t, €. connected to the source 5 or 6 not directly, but through the corresponding regulating transistor.

Transistor 4 (FIG. 1) is connected to the bus 9 by the emitter, and transistors 3 and 4 (FIG. 2) are connected to 1 9 by collectors. A trigger circuit made in the form of a resistor 12 (FIG. 1) or a sequence of connected resistors 12 and a diode 13 that is indicated by a dotted line (FIG. 2) is connected between the output of the stabilizer 1 (2) and the collector (emitter) of transistor 3 ),) 1 in stabilizer 1 (2),

In the block (Fig. 2), the start circuit can be switched between the emitter of transistor 4 and pin 7.

The bipolar power supply operates as follows.

In the initial state, the output rut of the stabilizers are isolated from sources 5 and 6 by closed transistors 3 and 4 and in the absence of the starting circuit, the current does not reach the terminals 10 and 11 and therefore the comparison nodes are de-energized and the stabilizers are locked. and 4 and source

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5, and the current flowing in the start-up circuit under the action of the emf of source 6 is the start current, since pins 10 and 11 are connected to pins 7 and 8, having a polarity conducive to the opening of the corresponding stabilizer. When transistors 3 and 4 are opened under the action of the starting current, the potential of the output 7 (8) increases in magnitude from zero to the value of the output voltage of the stabilizer 1 (2), and the potential of the other end of the start circuit decreases vice versa from the value of the EMF of source 6 (5) when transistor 4 (3) is closed, to a relatively small amount of voltage across the open transistor 4 (3). Therefore, the current through resistor 12 is significantly reduced or reverses its direction. The latter takes place when the output voltage of the stabilizer 1 (2) is greater than the voltage across the open transistor 4 (3). In this case, the neutralization circuit is fully neutralized and the elimination of the uncontrolled current in the stabilization mode is achieved by connecting the switch to the key starting circuit, for example, diode 13, which reacts to the current direction. However, often the output voltage of the stabilizer differs slightly from the voltage across the control transistor. In this case, a significant limitation of the uncontrolled current is achieved without the use of a diode

Thus, the invention makes it possible to significantly reduce the voltage on the elements of the trigger circuit in the stabilization mode and thereby simplify the circuit itself and increase the reliability of the trigger.

Claims (2)

1. A two-pole power supply unit containing a start-up circuit and two one-pole stabilizers, each consisting of a control transistor and an output for connecting the reference node, the control transistor being connected to the corresponding polar output terminal with the first power electrode and the auxiliary voltage source is connected to the common bus, and the output for connecting the ysJTa comparison is connected to one of the polar output terminals, so that, in order to increase the reliability of the launch by simplifying the starting circuit and reducing overvoltage, the transistor regulating at least one of the stabilizers by the first power electrode through the trigger circuit It is connected to the polar output of the other unipolar stabilizer. 2. The unit according to claim 1, differs from the fact that the trigger circuit is made in the form of a resistor. 3, a unit according to claim 1, characterized in that the starting circuit is made in the form of a series-connected resistor and a diode. F1 / yr 3