SU1767615A1 - Power supply reserved device - Google Patents

Description

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(21) 4927995/07 (22) 01/08/91 (46) 10/07/92. Bul №37 (72) V.I. Kichatov

(56) 1. USSR Author's Certificate No. 355688, cl. H 05 K 11/00, 1972.

2. USSR author's certificate number 392500, cl. H 05 K 11/00, 1973. (54) RESERVED POWER SUPPLY DEVICE

(57) Summary of the invention: in a power supply device, power supply units are connected in series with a current sensor and connected to an operating voltage source. In each unit - backup and main transformers with primary, secondary and control windings with primary and secondary, respectively. The outputs of the control windings are connected via rectifiers and switches to the inputs of the selector, the outputs of which are connected via circuits AND to the flip-flops controlling the keys that shunt the windings of the transformers. The device detects overloads in the power supply circuits of the blocks, automatically switches to standby transformers and remains operable in case of multiple defects until the reserve is completely exhausted. The operability of the blocks is determined by the voltages on the control windings and the current flowing through the current sensor. The two-stage control system provides correction of errors associated with failures of the control windings, rectifiers, switches and selector. 1 il.

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The invention relates to electrical engineering and can be used in power supply devices of high-reliability electrical radio equipment with protection of a source of electrical energy against overload.

A known redundant device containing the main and backup blocks connected to the power source through switches and the OR circuit, whose inputs are connected to the outputs of the main and backup blocks, the control output of the main unit is connected to the first input of the AND circuit, the output of which is connected to the control input of the power switch a backup unit, the output of which is connected to the control input of the power switch of the main unit, and a delay circuit, the input of which is connected to the power source, and the output to the second input c we I.

The disadvantage of this device is the presence of galvanic communication between the power source and redundant units, which during short circuits in the main unit can lead to a failure of the power source and the inability to turn on the backup unit (ed. St. No. 392500, cl. G06J 11/00 , 1973).

Closest to the proposed multi-channel power supply device containing single-channel power supply units, a reference voltage source, power supply and control windings, a current sensor, a switch, a selector, a key, an indicator, a power supply voltage source, a multichannel rectifier and an operating voltage source in which the power windings are connected in series with a voltage supply and a current sensor, the output of which is connected to the input

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a comparator whose input voltage reference is connected to the output of the voltage source, and the output is connected to the control input of the key, the first output of which is connected to the first output of the voltage supply source, and the second to the power input of the selector, the outputs of which are connected to the corresponding inputs the indicator, and the inputs are with the corresponding outputs of the rectifier, the inputs of which are connected to the first terminals of the corresponding control windings, the second terminals are connected to the common output of the rectifier, the second terminal of the source and the common bus oh (auth. binding. № 1,471,242, cl. H 02 N 7/04, 1989).

This device provides galvanic isolation of electricity consumers with a power source, identifies a consumer with an overload in the power supply circuit and at the same time protects the power source from overload.

However, this device does not provide an aromatic substitution for a faulty electrical consumer and remains operable only until the first failure.

The purpose of the invention is to improve the performance of the device in the event of multiple failures.

The drawing shows the functional diagram of the device

The device contains N power supply units 1, each of which has a main transformer with primary 2, secondary 3 and control 4 windings, a backup transformer with primary 5 and secondary b windings and switching node 7, N-channel rectifier 8, voltage source 9 bias, N switches 10, minimum signal selector 11, N circuits I 12, initial state setting element 13, N flip-flops 14, current sensor 15, comparator 16, reference source 17, operating voltage source 18. The power supply units are connected in series with the current sensor and connected to the operating voltage source, the outputs of the control windings of the main transformers are connected to the N-channel rectifier of the same name, the current sensor output is connected to the first comparator input, the second input of which is connected to the reference voltage source , with the normally closed and normally open contacts of the switching nodes shunt the series-connected primary windings of the backup and main transformers, the output of the computer The arator is connected to the combined first inputs of the AND circuits, the second inputs of which are connected to the corresponding outputs of the selector, and their outputs are connected to the single inputs of the corresponding triggers, the combined zero inputs of which are connected to the setup element of the initial state, and

0 by the combined control inputs of the same-name KNOT switch and switches, the first inputs of which are combined and connected to the bias voltage source, the second inputs of the switches are connected to the corresponding N-channel rectifier outputs, and their outputs are connected to the corresponding selector inputs.

The device works as follows.

After switching on the supply voltage with the help of the initial state setting element 13, the triggers 14 are switched to the zero state. In this case, the switches

5 10 connect the outputs of the multichannel rectifier 8 with the corresponding inputs of the selector 11, and the normally-closed contacts of the switching unit 7 shunt the primary windings 5 of the backup transformers

0 units 1 In series with the current sensor 15, the N primary windings 2 main transformers are connected to the source 18 of the operating voltage, from the output windings 3 of which can receive power from the N main consumers of electricity. The voltage from each control winding 4 through the corresponding rectifier 8 and the switch 10 is fed to one of the inputs of the selector 11 of the minimum signal. After comparing the input voltages at the output of the selector corresponding to the input number with the minimum voltage level, a signal of logical unit 1 is generated.

5 In the event of an overload in the power supply circuit of one of the electricity consumers or in the event of a short circuit in the windings of one of the main transformers at the output of the corresponding control winding, the voltage decreases while the voltage of the other control windings increases. As a result, the output of the selector 11, corresponding to

5, the power channel number with overload appears signal 1.

The presence of an overload in the circuit of the source 18 of the operating voltage causes a voltage increase at the output of the current sensor 15. When its threshold level is exceeded, the comparator 16 is triggered, and the combined second inputs of the And 12 circuits receive a signal

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The coincidence of signals 1 at the inputs of one of the circuits And leads to the translation of the corresponding trigger 14 into a single state. From the trigger output, the signal is fed to the control inputs of the switch of the same name 10 and the switching node 7. The switch disconnects the selector input from the rectifier and connects it to a bias voltage source whose voltage amplitude exceeds the voltage level from the control windings. Since the voltage at this input of the selector is known to exceed all other levels, the selector on this input is blocked and prepared for comparing the signals on other inputs.

The appearance of a signal at the control input of the switching node leads to the shunting of the primary winding of the main transformer and its replacement with the reserve one. In this case, the consumer of electricity through this channel can be connected to the secondary winding 6 of the backup transformer.

Disconnecting the overload source from the circuit of the source 18 of the operating voltage leads to the normalization of the current in the sensor circuit 15 and transfer of the device to normal operation and automatic control of the power supply units with the main transformers switched on.

Thus, during an overload, an automatic replacement of the power supply unit with an overload occurs and the memory of its number is triggered.

If overload occurs in another unit, the voltage on the control windings is similarly determined by the number of the failed unit and the standby transformer with standby power consumer is turned on.

The device maintains operability in the event of multiple failures to the full consumption of the reserve and allows for operational operation with automatic control in the presence of standby transformers.

Implementing a two-step decision-making algorithm for switching to the voltage reserve on the control windings and on the current value in the circuit of the operating voltage source allows self-monitoring of automation and eliminating spurious switches associated with breaks of the control windings and rectifier failures.

Claims (1)

Invention Formula A redundant power supply device containing a source of operating voltage, power supply units with transformers having primary, Secondary and control windings, current sensor, comparator, selector and multichannel rectifier, characterized in that, in order to increase reliability, a delay element, switches are introduced into it by the number of channels to the first inputs of which a voltage source is connected, the circuits And and triggers, and in each power supply unit a backup transformer is inserted with a primary winding switched by a closing key and a disconnecting key shunting the primary winding of the main transformer, while the power supply units are connected in series with source of operating voltage and current sensor, the output of which is connected to the input of the comparator, the output of which through the delay element is connected to the combined first inputs of the circuits And, the second in rows are connected to respective outputs the selector, and the outputs - with the single inputs of the respective triggers, the direct outputs of which are connected to the combined control inputs of the keys of the respective power supply units and the control inputs of the same switches, the outputs of which are connected to the inputs of the selector, and the second inputs through the multi-channel rectifier to the control windings power supply units in which the primary windings of the transformers are connected in series, the combined zero inputs of the flip-flops being the installation input of the device, and transformer secondary windings - its exits.