RU2346373C1 - Uninterrupted power supply unit for computers and computer systems - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: invention refers to the sphere of electrical engineering and is to be used to provide for power supply of computers and computer-based systems. Device contains a static converter connected to the electric mains and consisting of rectifier, inverter enabling delivery of alternating voltage power supply to the consumers that need no galvanic isolation and direct current power accumulator. Alternating voltage power supply is delivered also to the transverter consisting of an asynchronous motor connected via a common shaft to the exciter and the generator, their windings wrapped around a common stator, and an automatic voltage controller that, operating via the exciter auxiliary winding, modifies the generator excitation current in accordance with the consumer-end current regulation rules.

EFFECT: provision for reliable and high quality power supply of computer equipment combined with information leakage protection.

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Description

The invention relates to the field of electrical engineering and can be used to supply alternating voltage to computers and systems based on them, a feature of which is the need to protect against leakage of confidential information.

Currently, there are several types of uninterruptible power supplies for computers and systems based on them. According to the first type, the power of computers or computer systems is carried out in normal mode from the network with an alternating current voltage directly or by converting it first to a direct current voltage and then converting it to an alternating current voltage. During a temporary shutdown of the mains voltage in normal mode, uninterrupted power supply is carried out from the batteries, converting the DC voltage through the inverter to AC voltage. Converting an ac network current to direct and then direct to alternating current for powering computers and computer systems does not provide protection against leakage of confidential information from computers and computer systems, the transmission of which is possible by galvanic coupling of sections of AC and DC circuits.

This method is implemented in uninterruptible power systems such as of-fline or on-line, respectively, manufactured by APC, Best, Power, Emerson Electric, and others [1, 2].

The second type of technical devices [4] for supplying computers and computer systems with uninterrupted power supplies DC voltage, moreover, in normal mode, immediately after converting the AC mains voltage to DC voltage, and when the mains voltage deviates from normal mode, directly from the energy storage device direct current (electrolytic capacitors, molecular storage devices, batteries). In addition, before applying power to computers, it is converted and stabilized to compensate for the instability of the external network. The power supply in this device eliminates the double conversion of electricity, improves the quality of the supplied voltage, eliminates the inverter, but it is possible to supply a distorted sinusoidal shape to the AC rectifier from the network, which requires the use of a complex rectification circuit, and there is no protection against leakage of confidential information of the computer and computer systems due to their galvanic connection to the network.

Technical devices [7] provide computers and computer systems with uninterrupted power supply of DC voltage received from a galvanic isolation unit, powered by a network, which is a three-phase electric synchronous machine that combines an electric motor and an electric generator in one unit, the windings of which are located on a combined stator and are excited by a winding common rotor [4]. Energy is transferred from the electric motor to the electric generator with high efficiency through a single magnetic field without electromechanical converters, providing a three-phase voltage of an undistorted sinusoidal shape at the output. The power circuit of computers and computer systems is electrically isolated by this galvanic isolation unit from the network, which protects computers from leakage of confidential information and protects them from all types of disturbances in the input network, with the exception of additional devices for improving the quality of electricity.

However, this device does not provide alternating voltage power to computer systems - AC consumers, widely used in the national economy of objects distributed in space and requiring galvanic isolation with the primary power circuit.

The objective of this technical solution is to create a device that provides uninterrupted and high-quality AC power to computers and computer systems of objects distributed in space, with protection against leakage of confidential information.

The device contains a static converter, which is connected to the electric network and consists of a rectifier, inverter; it provides AC voltage to consumers and to an electric machine converter containing an induction motor connected by a single shaft to the generator and exciter with an automatic voltage control device introduced into the converter using the principle of phase compounding.

The drawing shows a block diagram of the inventive device. The block diagram contains a primary AC power circuit, including a static converter, consisting of a transformerless rectifier 1, an inverter 2 for supplying alternating voltage to the machine converter 8 and consumers 9 that do not need galvanic isolation, a chemical current source (DC energy storage device) 3 Depending on the duration of possible interruptions, either storage batteries or molecular storage devices can be used as a DC energy storage device. The secondary power supply circuit of the load 10 with alternating current is provided by an electric machine converter used as a galvanic isolation 8, structurally made in the form of a single machine, combining an asynchronous motor 4, connected by a common shaft with a pathogen 5 and a generator 6, the windings of which are located on a combined stator and are excited winding of the common rotor, allowing the output to receive the voltage of 3-phase current in a given range of changes, in accordance with the requirements of GOST for power consumption lei 10 (computer or computer system), requiring galvanic isolation.

The specified output voltage range is provided by an automatic voltage regulator (AVR) 7, which implements the principle of phase compounding, through an additional winding of the exciter 5 of the generator 6, connected to the AVR regulator, which changes the excitation current of the generator 6 in accordance with the law of variation of the load current of consumer 10. This single machine does not contains a brush-collector assembly, provides high-quality power to consumers (computers and their systems) and the protection of confidential information due to electromagnetic isolation Power supply and AC loads without direct contact of the power circuits, i.e. without their galvanic connection of the primary and secondary power circuits.

The device in normal mode works as follows: the mains voltage is rectified by an uncontrolled rectifier 1 to a stable DC voltage, which directly (without energy loss) feeds the inverter 2. The latter converts the DC voltage to AC voltage for direct power supply of the electrical machine converter - galvanic isolation unit 8 , which, in turn, generates an alternating voltage of a standard (undistorted) sinusoidal shape and powers the computer or computer computer system 10. Maintaining voltage in a given range when the load changes is carried out by an automatic voltage regulator 7, which implements the principle of phase compounding by changing the excitation current of a synchronous generator in proportion to the deviation vectors of the output voltage and load current.

In case of power outages or deviations in excess of the norm of the mains voltage, the consumers are powered without interruptions from the energy store used in the static converter.

The inventive type of construction of the device differs from the prototype in that in normal mode, the power distributed in the space of computers and computer systems with alternating current is carried out from an electric machine converter connected to a static converter, powered from an external network. The inventive method has industrial applications.

The applicants do not know the way to solve the problem with a given set of essential features, which indicates the "inventive step" of the technical solution.

The implementation of the device according to this scheme allows to reduce the weight and size characteristics of individual uninterruptible power supply devices by providing galvanic isolation of only a part of the most critical consumers out of the total number that require protection from unauthorized access to information, while meeting the reliability requirements of the uninterruptible power supply device by using a combination of a static converter electric energy and brushless electric machines of small power.

Information sources

1. Mkrtchyan J.A. Fundamentals of building computer power devices. Moscow: Radio and Communications, 1990

2. Exide Electronics: “Exide Electronics Corporation Uninterruptible Power Supplies.” Prospectus of the company, 1998.

4. Exide Electronics: “PC MAGAZINE / RE Uninterruptible Power Supplies. Special Issue, January 1997, p. 68-97. WORLD UPS. MIR PC, March 1997, p. 33-57. Briefing of manufacturers of uninterruptible power supplies. A computer. October 1997, S. 212-230.

4. Patent R2242833 C1 cl. 7 H02J 9/04, published. 2004. Bull. Number 35.

5. RWE Piller GmbH: PILLER UNIBLOK-R. Dynamic uninterruptible power supply and power conditioning device. Company Prospectus, 2002.

6. Kopylov I.P. Electric cars. Moscow: Logos, 2000.

7. Patent PM 53513 class. H02J 9/04, published. 2006. Bull. Number 13

Claims (1)

An uninterruptible power supply device for computers and computer systems, containing a static converter connected to the mains and consisting of a rectifier, an inverter, for supplying alternating voltage to consumers who do not need galvanic isolation, and a direct current energy storage device, alternating voltage is also supplied to an electrical machine converter, consisting of an asynchronous motor connected by a common shaft with a pathogen and generator, the windings of which are located on a combined stator, and automatically th voltage regulator which is across the exciter winding additional changes generator excitation current in accordance with the law of change of current user.