SU1265739A1 - Stabilized secondary electric power source - Google Patents

Abstract

The invention relates to electrical engineering, in particular, to devices (stabilized power supply of electronic equipment. The goal is to increase the efficiency of a stabilized secondary power supply (IEE). This is achieved by eliminating the control element - magnetic amplifier from the power part of the IBE; of this circuit by introducing a special control winding 16 into the output transformer 8 of the master oscillator 7. The changes in the output voltage of the IHE are transmitted through the node 9 to the feedback heel control output 16 of the transformer 8 oscillator 7, causing variations transformer saturation induction, resulting in a change-boiling switching frequency n (A generator of 7. This converter through transistor 2 and a high-frequency power transformer 3 changes the frequency of the pulse signal supplied to the parallel Lakes

Description

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i I ilL-iW-fnance LC-circuit 4, which changes its resistance and signal amplitude in accordance with the frequency supplied to the output rectifier 5

and further to the output capacitive filter 6, which leads to a change in the output voltage of the IHE, i.e. stabilization. 5 il.

The invention relates to electrical engineering, in particular, to devices for the stabilized power supply of electronic equipment and can be used in the field of secondary power supply for electronic equipment of communications equipment, automation, instrumentation and computing.

The aim of the invention is to increase the capacitance of the stabilized source of secondary power supply (IVE). Fig. 1 shows a schematic of a stabilized source of secondary power supply; in fig. 2 is a simplified replacement scheme; in fig. 3 - the hour is the characteristic of the resonant circuit; in fig. 4 and 5 are possible embodiments of a master oscillator transformer with an inserted control winding.

IHE is made with a transformer-free input and contains an input rectifier 1, for example, in the form of a three-phase valve bridge with inductively. a capacitive filter and a series-connected static transistor converter 2, made, for example, by a half bridge circuit, a high-frequency power transformer 3, a parallel resonant LC circuit 4, an output rectifier 5, for example, in the form of a valve bridge and an output capacitive filter 6, as well as a transistor master oscillator 7, made according to the Roer push-pull circuit with an output transformer 8, the secondary windings of which are connected to the control inputs of the static transistor converter 2, and the return unit second communication comprising izmeritelny element on the circuit input, e.g., a resistive divider 10 voltage, the output of which is connected to the input of the comparison element, for example in the form of operational amplifier 11,

the other input is connected to a voltage source in the form of a Zener diode 12, and the output is connected to the input of a DC amplifier - an emitter follower on transistors 13-1, the output of which is the output of the feedback node. In the output transformer 8, a control winding 16 of a constant TOKd is inserted, the output of which is controlling the input of a master oscillator 7 connected to the output of the feedback circuit.

An additional low-power rectifier 17 serves to power the master oscillator circuits and the feedback circuit.

The operation of the circuit is carried out as follows.

Claims (1)

When a supply voltage is applied to the IHE input, the master oscillator 7, with self-excitation, forms a rectangular-shaped voltage in the windings of the output transformer 8. At the same time, at the half-wave corresponding to the positive voltage value on the secondary winding Wj of the transformer 8, the transistor 18 of the static converter 2 receives an unblocking pulse and the network voltage, converted to a constant rectifier 1, is applied to the primary winding Wf of the power transformer 3 through the capacitor 19 and the collector-emitter junction of the transistor 18. At the next half-wave, corresponding to a positive voltage value on the secondary winding W of the transformer 8, the transistor 18 is locked and the trigger pulse is supplied to the transistor 20 and the rectified network voltage through the capacitor 21 and the collector-emitter junction of the transistor 20 is applied to the same winding W of the transformer 3 in reverse polarity. Since the inductance 22 and the capacitance of the capacitor 23 prevent a jump-like current from the secondary windings of transformer 3, the transformer 3 windings and transistors 18 and 20 vary in a sinusoidal law, thereby determining the form of the electromotive force in the transformer 3 windings. in the form of a simplified replacement scheme (Fig. 2). In this case, the static transducer 2 can be considered as a source of sinusoidal signals with a value of EMF - E. The load resistance of the IHE is represented by the resistance Cc. L (22) and C (23) are elements of the resonant circuit A. At a generator frequency f °° P equal to the resonant frequency of the oscillating LC circuit, and for large η (idle mode), the voltage at the output of the resonant circuit maximum. As the generator frequency increases, the output voltage decreases asymptotically (the frequency response of the IHE resonant circuit in Fig. 3, expressed in a relative change in voltage versus frequency). Thus, by varying the switching frequency of the static converter in the considered IHE, depending on the change in load resistance or voltage, the voltage on the IHE output is kept constant. According to the principle of operation of the generator itself, the switching of converter transformers occurs in each half-period when the magnetic flux of the transformer 8 reaches saturation induction In% B ,, magnetopic. When current flows through the primary winding of the transformer 8 in the magnetic circuit, a voltage of a variable magnetic field H and a corresponding magnetic induction B are created. By introducing into the transformer 8 an additional control winding 16 and passing through it, the control current iunp creates a tension of a constant magnetic field Wynp and according to her induction B. {UjH .. 394 Since the stress vectors of the variable H and the constant h magnetic fluxes are superimposed arithmetically H N H + H upon imposing on each other, this leads to a decrease in the inductive saturation, i.e. B, B - | U, or p, c. at. - differential magnetic where the permeability of the magnetic material; ignp - control winding current; - the number of turns of the control winding; 1 & - the average length of the magnetic control power flux line (Fig. 4 and E.) Thus, reducing the induction level, transformer saturation reduces the rise time of the alternating magnetic flux to this level, i.e., the switching frequency of the generator transistors, which turn, causes a change in the output voltage of an IHE, i.e. with a tablization. Possible embodiments of controlled transformers for a master oscillator (Fig. 4 and 5) on magnetic conductors of a W-shaped structure made of ferrite are possible. Current conditionally shown as W and W. In addition to these structures, controlled transformers can be used on ring magnetic conductors, as well as transformers with orthogonal, intersected by magnetic fields. The efficiency is achieved by excluding the magnetic amplifier from the power circuit and, consequently, losses. Claims of the invention A stabilized source of secondary power supply containing in series an input rectifier with pin, trans source voltage converter, high-frequency output transformer, resonant circuit, output rectifier and smoothing filter, transistor in-stroke master oscillator with output transducer, secondary windings of which are connected to control inputs of the transistor voltage converter, feedback node whose input is connected to output pins, characterized in that, in order to increase efficiency, a control winding is inserted into the output transformer of the master oscillator, the outputs of which are connected to the control the input of a master oscillator connected to the output of the feedback node J of communication. Fig2 (.  Wy / 7p f  L. g4 fV CHI Figm