SU1374205A1 - D.c. voltage stabilizer - Google Patents

Abstract

This invention relates to secondary power sources. The aim of the invention is to increase efficiency. An input alternating voltage is applied to the primary winding 2 of the power transformer 1 wound on one extreme rod of a three-core magnetic circuit. The output turnoff of the transformer 1 coil is performed on two sections 3.1 and 3.2 in series. Moreover, the first section is wound on the first, and the second on the second extreme rods of transformer 1. Auxiliary winding 4 is also wound on the first extreme rod, and a control winding 5 is wound on the second extreme rod. The sum of the output voltages of windings 3.1 and 3.2 rectifier ml and is filtered by the rectifier filter 6. This voltage is fed to the input of the control unit 9, which controls the operation of the regulating element 8. In the interval when the signal from the output of the control unit 9 is absent, the regulating element 8 short-circuits the regulating voltage. heel 5. The voltage across the coil section 3.2 in this case is zero. When the regulating element 8 is unlocked, the voltage of the auxiliary winding 4 is rectified and smoothed by the rectifier filter 7 is connected to the control winding 5. A voltage applied to sections 3.1 and 3.2 of the output winding of the transformer 1 is applied to the rectifier input of filter 6. 6 Il. g (L

Description

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The invention relates to electrical engineering and can be used, for example, in the development of secondary power sources.

The aim of the invention is to increase the efficiency of the stabilizer constant i ap wife. v

Fig. 1 shows a constant voltage regulator circuit} in Fig. 2, time diagrams explaining its operation, Fig. 3 and 4, an embodiment of the regulating element j in Fig. 3, an embodiment of the control unit; Fig. . 6 is a timing chart explaining the operation of the control unit.

The device consists of a transformer made on a three-core magnetic core 1, on the first extreme rod of which the primary winding 2 is located, connected to the mains terminals, the first section 3.1 of the main output winding and the auxiliary output winding 4. On the second extreme rod are the second section 3.2 of the main output winding and control winding 5. Sections 3.2 and 3.1 of the main output winding are connected in series and connected through the first rectifier filter 6 to the output terminals of the device. - Auxiliary output One winding 4 is through a second rectifier filter 7 and the regulating element 8 is connected to the control winding. The control input of the regulating element is connected to the output of the control unit 9, which by its inputs is connected to the output terminals of the device.

The device works as follows.

The network voltage is applied to the primary winding of the transformer. As a result, a magnetic flux is created at the first extreme rod to balance the network voltage. This flow induces a voltage across windings 3 and 4, determined by the transformation ratio.

The alternating voltage removed from the winding 4 is converted by the second rectifier filter 7 into a constant voltage and fed to the regulating element 8. With the help of the regulating element 8 the constant voltage is converted into a variable of a certain shape and amplitude and fed to the winding 5 by creating

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while on the second extreme rod of the second magnetic flux. In the cutting section on the winding 3.2 of the second section, the main output winding is induced by the voltage determined by the transformation ratio of the windings 5 and 3.2. The total voltage from the windings 3.1 and 3.2 using the first rectifier filter 6 is converted into a constant voltage, which is applied to the output terminals of the device.

The magnetic fluxes generated in the extreme rods of the transformer are closed through the middle rod, on which there are no windings. From the output terminals of the device, the voltage is applied to the control unit 9, where this voltage is compared with the reference voltage and a control difference signal is generated, which, acting on the control input of the regulating element, changes its output voltage parameters in such a way that that the voltage at the output of the device remains unchanged.

The operation of the device is explained using the diagrams shown in Fig. 2. For the case of pulse control of the keys of the regulating element, where. You have the following designations:

mains voltage applied to the device voltage on the winding 3.1 {direct voltage at the output of the rectifier filter 7j

the voltage across the winding 3.2, formed by the regulating element 8 through the winding 5; the total voltage on the main output winding supplied to the input of the rectifier filter 6 - the voltage at the output of the rectifier of the first rectifier filter 6; voltage at the output of the device.

It can be seen in Fig. 2 that by changing the width or A1.1 of the pulses at the output of the regulating element, one can thereby change the average voltage value at the output of the rectifier of the first rectifier of the filter, and consequently, at the output of the device. Based on this principle, through feedback through the control unit of the organization

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This effect on the regulating element is such that the output voltage remains unchanged within the limits of a given accuracy.

The voltage at the output of the regulating element is formed in the region of the moments of transition of the mains voltage through the zero level, thereby filling the pauses in the rectified voltage and reducing the pulsations in this voltage. By choosing the key management law of the regulating element, the voltage output of the rectifier with very small ripples can be obtained.

One of the embodiments of the regulating element, which allows adjustment of the voltage pulse duration on the winding 5, is shown in FIG. Here, at intervals c ,, (see FIG. 2), keys 8, 8 close, and at intervals t, Cj, keys 8 2, 8j. At other points in time, a pair of switches 8, 8 (or 83, 8) is closed to provide zero voltage U j on winding 5. As a result, the voltage across the winding 3.1 is also practically equal to O and the losses arising from the flow of current through the winding 3.2 are determined only by the ohmic resistance of the copper of this winding. The closing and opening of keys is performed by the control unit. In the control element according to FIG. 3, when current is passed through the winding 5, two keys are always on at the same time.

Another embodiment of a regulating element with a pulse control, in which the regulating winding current passes through only one switch, is shown in FIG. 4. Here, the regulating winding consists of two identical sections 5.1 and 5.2, with the switch 8u closed at intervals t, and the current is passed through section 5.1, while at intervals t, the switch 8 is closed and the current passes through section 5.2. The rest of the time, in order to ensure zero voltage on the winding 3.2, the key 8 is closed.

Other embodiments of the regulating element are possible.

The control unit for pulse control by the regulating element (Fig. 3) consists of a comparison device 10, an integrator 11, a total of 0

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Pa 12. Comparators 13 and 14, the inverter 15, logic elements. Both 16 and 17. The inputs of the comparison device 10 are supplied with the signals of the load voltage and the first reference voltage, which determine the level of stabilization of the output voltage. The differential signal, after integration, is corrected by means of the adder 12 with a second reference voltage, which determines the nominal duration of the control pulses. From the output of the adder 12, a control signal is applied to the comparator 13, to the other input of which a rectified network voltage signal is applied. Thus, at the output of the comparator 13, a sequence of pulses is generated in the region of the moment of transition of the mains voltage through the zero level, which are fed to the first inputs of the AND elements 16 and 17. The second inputs of these elements are supplied by direct and inverted pulsed signals the signal using a comparator 14. At the outputs of the elements 16 and 17, two sequences of control pulses are formed, varying in duration, and from the output of the element

15 pulses are fed to one pair of keys Bj, 8, and from the output of the element

16- to another: a pair of keys 8, 8 of the regulating element according to FIG. 3 (respectively the key 8 and 8j for the regulating element according to FIG. 4). The keys 8z, 8 (key 83 in FIG. 4) are controlled to close the control winding using a pulse signal, which is obtained by inverting the signal from the output of the comparator 17.

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Claims (1)

Invention Formula A constant voltage stabilizer containing a power transformer, the primary winding of which is connected to the mains terminals, the first expander-filter connected by inputs to the main output winding, the second rectifier-filter connected by inputs to the auxiliary output winding, regulating element, the inputs of which connected to the outputs of the second rectifier filter, node, control, connected by inputs to the output terminals of the device, output .fie.g Uynp - Uttti