SU595836A1 - Stabilized dc- to-dc voltage converter - Google Patents

Description

I

The invention relates to electrical engineering and is intended for use as a secondary source of power for computer and electronic equipment.

A stabilized DC / DC converter is known, which contains a transistor control element with individual current transformers in the positive feedback circuit.

Closest to the invention, the technical process is a stabilized constant-voltage converter in a stand-alone state, containing a power amplifier} ia transistors connected to the input terminals of the transistors connected in half-bridge circuit and controlled by current transformers connected to the collectors of equalizing transistors, basic the circuits connected to the outputs of the control unit, the inputs connected to the output terminals, to which the output of the smoothing filter is connected, the input connected to the output, straighten l, the input of which is connected to the secondary winding of the output transformer of the power amplifier.

The aim of the invention is to improve the reliability of the stabilized DC / DC converter 2

worth it. This goal is achieved by the fact that the proposed stabilized constant-to-nanotransformer is supplied with additional transistors,

two sub podamps, an interlock when turned on and off, an input connected to an additionally inserted power supply, and an output to a base of a transponder transistor whose emitter is connected to

emitters, and a collector through diodes - with collectors of control transistors.

The principal electrical circuit of the stabilizer is a voltage converter (), a constant voltage converter into a constant representation of 1a on

drawing.

The stabilized converter contains a power amplifier I on transistors connected to the input terminals, but included in a nolomost circuit and controlled

By means of current transformers connected to the collectors of the control transistor 2, 3, the basic circuits connected by the outputs of the control unit 4, the current output connected to the output terminals to which

the output of the smoothing filter 5, the input of the connected by the output of the output terminal 6, the input of which is connected to the secondary winding of the output transformer 7 power amplifier; additional transistor 8, emitter

which is connected to emitters, the collector

3 through diodes 9, 10 - with collectors of transistors 2, 3, and the base - with the output of block 11 when turned on - off, consisting of transistor 12, zener diode 13 h of resistors M, 15 and 1b. The input of the node and the connections with the preinitially entered power source 17. The stabilized voltage and voltage generator in the current works as follows. When turned on, when the growing voltage of the source of power supply 17 still does not reach the level at which the normal operation of the control unit 4 is ensured, the simultaneous unsaturated state of the control transistors 2, 3 can take place; the zener diode 13 is not yet connected, the transistor 12 is closed, and the transistor 8 is open, and since its base from the source is flowing a current through the resistors 15, 16. In this case, the circuits of the winding current transformers are connected to the source 17 through diodes 9, the Yun junction collector emitter of the saturation transistor 8, which prevents the possibility of end-to-end switching on the power transistors regardless of the state of the driving tracer 2, 3. When the normal load of the source 17 reaches the base of the transistor 12 through a resistor 14 and a zener diode 13 and the current is flowing, the transistor 12 opens and shunts the base and transistor 8, which is locked in no further effect on the operation of the converter. Turning off the inverter, the converter operates with the voltage of source 17 shining until current through the resistor 14 and the zener diode 13 continues to flow to the base of transistor 12, after which transistor 12 closes and transistor 8 opens. In this case, the values of the control windings of current transformers through diodes 9, 10 and the emitter-collector transition of the saturated transistor 8 are connected to the source 17. Switching

Claims (1)

4 sludge transistors of power amplifier 1 is terminated, and, with a further decrease in the power supply of source 17, an arbitrary state of control node 4 cannot create conditions for the through switching off of the power supply; t p and and 3 and with about r about in. Thus, the node 11 controls the voltage of the source of the imitation 17 and controls the operation of the additional transistor 8, which through the diodes 9, 10 blocks the control windings of the current transformers and turns on and off, preventing the occurrence of through currents of the power transistors of the power amplifier 1, which causes an increase in the reliability of operation of a stabilized constant-to-constant converter. Claims of the invention: “Stabilizing a constant-and-constant-to-array converter, containing a power amplifier and tractors connected to the input terminals, but a half-bridge circuit and controlled by current transformers connected to the control collectors ;; Traceors, the base circuits connected to the outputs of the right of his node, the input; the first with the output pins, and the keys to the output of the smoothing filter, the input connected to the output of the rectifier, the input connected to the secondary winding of the output transformer of the power amplifier, about TL And so with the fact that, in order to increase the reliability of operation of the transformer, and siabzhsi additional Traizistoram, two diodes and a node blocking and switching on - off, input nitani nickname, and output - with base doiolnitelnogo transistor, the emitter of which soediien the emitter and collector through diodes - the collectors of transistors uiravl constituents.