SU1629905A1 - Multichannel power supply system - Google Patents

Abstract

The invention relates to electrical engineering and is intended to supply loads that require different voltage ratings with a wide range of their currents. The purpose of the invention is to expand the scope of application by ensuring the galvanic isolation of the outputs of the stabilization channels from a controlled voltage source.

Description

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belt current The device contains a controlled source 1 of alternating current voltage, power transformer 2, whose N secondary windings are connected to the inputs of N stabilization channels on linear stabilizers 40 The control input of source 1 is connected to the output of control unit 5 The pulse transformer 7 is entered in the circuit with N secondary windings 9 connected via limiting diodes 6 with stabilizers 4, control switch 10, pulse generator 11, auxiliary power supply 12 and capacitor 14 "This allows galvanic and distribute channels from source 10 2 or

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 The invention relates to electrical engineering and is intended to supply loads that require different voltage ranges with a wide range of variations in their currents.

 The purpose of the invention is to expand the range of application by providing galvanic isolation of the outputs of stabilization kaals from the controlled input voltage of the alternating current

Fig. 1 shows a functional diagram of a multichannel power supply system; FIG. 2 shows temporary diagrams explaining its work.

The system contains a controlled source of AC voltage 1, the output of which is connected to the primary winding of a power transformer 2 with N secondary windings, N stabilization channels, each of which consists of rectifier 3 with a filter and a linear stabilizer

4 direct current voltage unit

5 control with DC amplifier, N limiting diodes 6, pulse transformer 7 with primary winding 8 and N secondary windings 9, control switch 10, control input connected to output of pulse generator 11, auxiliary power supply 12, rectifying diode 13 and 140 capacitor

 In the time diagrams of Fig. 02, the following notation is adopted: i.tJj - voltage drop on the regulator 50

driving transistor of the linear stabilizer 4 of the first channel; di is the voltage drop across the control transistor of the linear stabilizer 4 of the second channel; Dish- - voltage drop across the regulating transistor of the linear stabilizer 4 of the N-ro channel;

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50

5 and

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40

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t 1-2

AND

0 is the voltage across the capacitor 14; Uq (y form voltage at all

(N + 1) windings of the transformer 7 (one primary and N secondary);

- moments of on and off pulses; the time intervals during which the key 10 is closed, the system works as follows.

The alternating voltage from the output of the controlled source 1 through the transformer 2 is fed to the inputs of the rectifiers 3 with filters, where it is rectified, then the resulting constant voltage is fed to the inputs of the linear stabilizers 4, the outputs of which form the necessary output voltages

The pulse generator 11 generates pulses closing the switch 10 in time intervals, and t (Fig. 2). At the same time, a voltage of polarity is applied to the primary winding 8 of the pulse transformer 7 via the switch 10 from source 12, covering all diodes 6 and 13 "

The current from the source 12 through the primary winding 8 stores in the inductance of the transformer 7 some energy that at the time the key is unlocked (time t and t) is released in the form of pulses of backward electromotive force. magnitude, but since the secondary windings 9 are connected between the inputs and outputs of the linear stabilizers 4 via restrictive diodes 6, then when the amplitude of the reverse pulse is reached, the magnitude of the voltage drop a linear regulator transistor having the smallest voltage drop yy at a given time and "for example, the first & U, the first diode 6 opens and limits the pulse amplitude to UU (+ Ua, where U is the direct voltage drop across diode 6 Therefore, the voltage on all windings, since they are inductively interconnected, has the form shown in Fig. 2 (U (jj, (0 ch) The back EMF pulses that also occur on the primary winding 8 of the pulse transformer 7 will open the diode 13 and charge capacitor 14, for example of which will be in the form Uc (Figo 2) This voltage is approximately equal ulf ,, capacitance 14 can be chosen so that the ripple voltage it had the lowest allowable value.

Thus, it turns out that the voltage on the capacitor 14 is equal (with the same number of turns of the primary and secondary windings of the transformer 8) to the voltage drop U UJJf on the regulating transistor of that linear regulator, which at this time has the maximum load, that is, the capacitor 14 is allocated the minimum voltage CEE MIN. The voltage of the capacitor 14 is fed to the input of the control unit 5 with a DC amplifier; here it is compared with the set point, a mismatch signal is produced, which amplifies TC and controls the output voltage of source 1 in such a way that the input of the linear stabilizer 4 of the most loaded channel maintains a voltage greater than the output by the minimum allowable amount of ike mits for the normal operation of the linear regulator 4, in this case, the first channel. loaded second channel, the circuit will maintain the minimum required voltage U.U2 UK9

already for the second channel „

Due to the fact that at any time

the time to the input of linear stabilizers is the minimum allowable for normal operation of linear voltage regulators, this solution provides the maximum efficiency value, this property is inherent in the known system. However opie

 The system provides galvanic isolation between the cable; Alai, provides isolation of outputs from source 1 o. Source 12 and generator 11 can be used in control units of stabilizers 4 and controlled source 1 o. Thus, the proposed invention significantly simplifies the circuit diagram of the system, reduces the number of components, and therefore improves reliability.

Since both capacitors are connected at the input of the linear stabilizer 4 and at the output, the effect of the current pulses through the regulating transistor on the operation of the stabilizers is insignificant, the current value can be

0 receive about 1 mA, which is practically imperceptible for sufficiently powerful stabilizers, in addition, current pulses are present only on the stabilizer that has a maximum load current of 5, which further masks the back EMF pulses

In that case, ecrat in a multichannel stabilizer uses linear stabilizers 4, allowing for different

0 value, secondary feedthroughs are supplied with an appropriate number of turns proportional to which ensures the normal operation of all linear stabilizers with maximum Efficiency 0

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Claims (1)

Invention Formula The multichannel power supply system contained; and a controlled AC voltage source, the control input of which is connected to the output of the control unit with a DC amplifier, and the output with the primary winding of a power transformer with N secondary windings, N stabilization channels, each of which is | It consists of successively connected rectifier with a filter and a linear voltage regulator, the rectifier input with a filter is connected to the corresponding secondary winding of the power transformer, and the rectifier output is connected to the terminals for connecting the corresponding load, which is In order to expand the scope of application by providing galvanic isolation of the output channels of the stabilization channel from a controlled source of alternating voltage, an impulse transf Matora with one primary and secondary windings N controlled by the key, the auxiliary power source pulse generator Sator capacitor, a rectifier diode and N restrictive diodes thus of the primary winding is connected to vspomo- ha telnomu power source via and 4b No. d FIG. 2 a control key, the start of the winding, and a pulse generator connected to the input of the control unit with a DC amplifier and a capacitor through a rectifying diode, and the secondary windings of the pulse transformer start to be connected through the appropriate limiting diode to the input, and the end directly to the output of the linear stabilizer of the corresponding stabilization channel.