SU1309013A2 - Pulsed voltage stabilizer with overload protection - Google Patents

Abstract

The invention relates to secondary power sources and is complementary to the author's certificate No. 1130850. The goal is to increase the efficiency of the stabilizer. In the proposed device, the secondary winding of the filter throttle is executed in the form of two windings with counter-connected, the difference in the number of turns of which is equal to the number of turns of the primary winding. This embodiment of the windings of the throttles makes it possible to reduce the current of the secondary winding, the dissipated power on the resistor and thereby increase the efficiency of the device as a whole. In this case, there is no need to use a winding wire of small cross section. 1 hp ff, 1 ill. "

Description

The invention relates to electrical engineering, in particular to stabilized power sources, and is an improvement of the device according to the authors. St. No. 1130850.

The purpose of the invention is to increase the efficiency of the stabilizer.

The drawing shows an electrical circuit of a pulse voltage regulator with overload protection.

The pulse voltage regulator contains input pins 1, through the power amplifier 2 and the rectifier

3connected to the primary winding

4 smoothing throttles 5, the second terminal of which is connected to the first input of the threshold device 6, to the output phases 7 and to the input of the measuring and amplifying node 8. Parallel to the output terminals, a filter capacitor 9 is installed. The outputs of the threshold device and the measuring and controlling node are connected to the impulse inputs control node 10, the output connected to the control input Home power amplifier.

The secondary winding of the smoothing throttle 11, containing two windings, is connected to the same output of the primary winding by one output, and the second to the second input of the threshold device and through a resistor 12 to the common busbar. I

Pulse stabilizer works as follows.

In the on state, on the secondary winding of the throttles 5, an alternating voltage equal to the self-induced EMF of the primary winding is formed, so

as the difference between the turns of the secondary windings of the semi-windings is equal to the number of turns of the primary winding. Since two of the same name winding leads are interconnected, and the voltage on the primary winding can be represented as a sum of self-induced EMF and voltage on the active side of the winding, between the other two ends of the windings and, accordingly, between the inputs of the threshold device 6 voltage equal to the voltage across the active resistance of the primary winding of the throttle minus the voltage drop across the secondary winding. The specified voltage is proportional to that flowing through the choke and, therefore, to the load current.

0

0

The current through the secondary winding smoothing throttle. 5 is set by resistor 12 and is chosen so that the voltage drop across it is equal to the voltage drop across the primary winding at the minimum load current.

At rated load current, the voltage drop on the half windings of the smoothing throttle exceeds the voltage drop on the primary winding and the threshold device is in the disconnected state. When the load current exceeds the maximum value of 5, the voltage drop across the primary winding is dross (2 l exceeds the voltage drop on the secondary semi-windings and the threshold device turns on the pulse control unit with its output signal and thus the power amplifier 2.

After locking the power amplifier, the current through the choke gradually decreases to its original state, and the power amplifier re-enters operation. With a subsequent increase in the load current to the maximum value, the threshold device is triggered again.

The process is repeated periodically until the load conductivity is reduced to a value that provides the allowable value of the output Current of the device.

Thus, for any load conductance, the output current of the stabilizer does not exceed the specified allowable value.

The voltage drop on the windings of the smoothing throttle, respectively

five

0

five

 I,

- -

.Wi | BP

S,

V 2

S

S, - S -

de v, v. I "- I. in

voltage drop on the primary winding of the throttles; voltage drop on the secondary winding of the throttles; load current;

current through the secondary winding drossel;

the length of one turn of the wire winding drossel; cross section of the primary winding throttles;

cross section of the secondary winding throttles;

resistivity of the winding wire;

the number of turns of the primary winding;

the number of turns of the secondary winding.

Let us assume the following assumptions: the input current of the threshold device is approximately zero, the threshold device operates at a potential difference across the inputs equal to zero.

Taking into account that at the moment of protection V, - 2 we get

IilWjL-.Je. Ii; WilIi

2 W t -s

IH.I§A I S.

From relation (1), it follows that all temperature and time instabilities of the parameters of the windings of the throttles are excluded from consideration, i.e. the independence of the threshold of the temperature protection circuit is ensured.

090134

The current through the secondary winding of the chokes can be chosen sufficiently small with an appropriate choice of sections and the number of turns of the primary and secondary windings, while the power dissipated in the resistor can be reduced 10 or more times.

The use of the proposed protection scheme favorably distinguishes the proposed O device from the known one, since it allows to increase the efficiency and thereby expands the range of application of the stabilizer.

15 f

formula of invention

20

25

V)

1. Pulse voltage stabilizer with overload protection according to aut. St. No. 113085S, characterized by the fact that, in order to increase the efficiency of the stabilizer, the secondary winding of the choke of the LC filter is made of two half-windings connected back-to-back.

2. Stabilizer p. 1, that is, that the difference between the number of turns of the semi-windings of the secondary winding of the choke is equal to the number of turns of the primary winding.

r- vSAJUM 4 ysvW4.

Compiled by S.Gorbachev Editor N.Tupitsa Tehred V, Kadar-Proofreader S.Shekmar

Order 1798/41 Circulation 864 Subscription

VNISh of the USSR State Committee for Inventions and Discoveries 113035, Moscow, Zh-35, 4/5 Raushsk nab.

Production and printing company, Uzhgorod, st. Project, 4

Claims (2)

Switching voltage regulator with overload protection according to ed. 1130850, characterized in that, in order to increase efficiency, the secondary winding From the relation, all temperature bilia of the parameters of the inductor windings are excluded from consideration in this case., The bridge from (1) implies that temporary those. Independence of the operation threshold of the temperature protection circuit is ensured. one. saints No. With I TVMu 4iUj stabilizer, the LC filter throttle is made of two half-windings connected in counter-series. 2. The stabilizer p.p. 1, the fact that the difference in the number of turns of the semi-windings of the secondary winding of the inductor is selected equal to the number of turns of the primary winding.