WO2008123839A1 - Method for alternating voltage regulation - Google Patents
Method for alternating voltage regulation Download PDFInfo
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- WO2008123839A1 WO2008123839A1 PCT/UA2007/000072 UA2007000072W WO2008123839A1 WO 2008123839 A1 WO2008123839 A1 WO 2008123839A1 UA 2007000072 W UA2007000072 W UA 2007000072W WO 2008123839 A1 WO2008123839 A1 WO 2008123839A1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
- H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
- H02M5/22—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M5/275—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/293—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
Definitions
- the present invention relates to the field of electronics and automatics; particularly, it relates to the processes of conversion of alternating current energy at input into alternating current energy at output, so that the voltage to change without intermediate conversion into direct current, using devices utilizing semiconductor elements with control electrodes and elements designed for contacts closure and opening.
- Alternating voltage regulation is used in electric power supply, automatics systems, alternating current electric drives, and many other electronic devices.
- Such regulation is often realized using magnetic amplifiers, multiwinding transformers with thyristor commutation of windings, and various thyristor circuits, which change effective voltage value.
- the said methods employ devices that have relatively large weight and dimensions; they do not provide for desired limits of voltage regulation or distort voltage sine shape.
- autotransformer devices driven by an engine are also used for alternating voltage regulation. Usage of autotransformer devices provides for energy recuperation under the load of complex nature, however, these devices have relatively large weight and dimensions; their usage causes increase of expenses and low speed of the regulation process.
- the circuit of the device which may be used for the embodiment of the described method of alternating voltage regulation, comprises an inverter, high frequency transformer, synchronous rectifier, and smoothing filter.
- the embodiment of the above method implies a large number of elements of relatively high weight and dimensions, particularly, high frequency transformer.
- Such method of alternating voltage regulation is relatively expensive and not sufficiently reliable because of the presence of six semiconductor switches.
- the presence of the transformer does not provide for the possibility of recuperation, considerably decreasing efficiency of the regulation process.
- Average output voltage U ou t can be found from the following expression:
- the described method for alternating voltage increase at the load provides for continuous current at the output, implies the use of the inductor of relatively small dimensions and weight. Therewith, the output voltage is at the same phase with the input voltage.
- the energy recuperation is provided by the interrelation of on and off states of the parallel ( ⁇ duration) and series (T - ⁇ duration) switches times or, in other words, by an antiphase control of the switches.
- the described method assumes the obtaining of intermittent current at the output and does not permit decrease of the alternating output voltage.
- the same source contains the description of the method for alternating voltage decrease at the load without usage of transformer devices, which also implies the use of an inductor, a parallel switch and a series switch.
- the input alternating voltage is fed to the input of the series switch the output of which is connected to the input of the inductor and input of the parallel switch.
- the output of the parallel switch is connected to the common wire, and the load is connected to the inductor output.
- the average value of the output voltage U out may be determined by the expression:
- the described method for alternating voltage decrease at the load provides for continuous current at the output, and implies the use of a relatively small by its dimensions and weight inductor.
- the output voltage is in phase with the input voltage.
- energy recuperation is provided by the interrelation between the time of closed and open states of the parallel ( ⁇ duration) and series (T - ⁇ duration) switches, or, in other words, by antiphase control of the switches.
- the described method assumes the obtaining of intermittent current at the output, and it does not permit the increase of the output alternating voltage.
- the alternating voltage is fed to the input of the first series switch whereto the input of a parallel inductor and the input of the other parallel switch are connected.
- the output of the other parallel switch is connected to the load, and the output of the parallel inductor is connected to the common wire.
- Uj n is the input alternating voltage.
- the described method for alternating voltage regulation assumes presence of intermittent current at the input and output of the used in this process elements connection circuit. Accounting for the fact that the output voltage is in antiphase with the input voltage, it is necessary to use high voltage power switches with the applied voltage, which exceeds the voltage in the last two described above methods of regulation by two times; this causes increase of dimensions, weight, and cost of this switches as well as decreases reliability of the regulation process. Besides, the described method uses an inductor, which accumulates energy in the whole power range, which is transferred to the load. This leads to increase of the weight, dimensions, and cost of this element and decreases reliability of the regulation process as well.
- the features of the closest analog that agree with the essential features of the proposed invention, are: conversion of voltage into sequence of bipolar pulses of much higher frequency as compared to the frequency of the input alternating voltage, which is regulated; said conversion is carried out by antiphase closure and breaking of two switches.
- the objective of the invention is the decrease of the weight and dimensions of the assemblage of the devices, which are used in the process of alternating voltage regulation, which will provide for the expanding of the field of usage of such process as well as the increase of reliability and cost decrease of the process by means of using different devices and different sequence of operations with them with simultaneous provision for continuity of the current at the load input.
- the specified objective is achieved by the method for alternating voltage regulation, according to which voltage is converted into a sequence of bipolar pulses of much higher frequency, as compared to the frequency of the input alternating voltage, the duration of which determines the regulated voltage, and said conversion is accomplished by antiphase closure and opening of two switches, according to the invention, the alternating voltage is fed to the input 2 of the parallel relay and to the input 2 of the input relay, the input 3 of which is connected to the input of the inductor, and the input 1 is connected to the input 1 of the output relay, the input 2 of which is connected to the common wire, and the input 3 is connected to the output of the series switch, the input of which is connected to the output of the inductor and to the input of the parallel switch, the output of which is connected to the input 3 of the parallel relay, the input 1 of which is connected to the common wire, and the load is connected to the input 1 of the output relay, therewith, for increase of alternating voltage, the input 3 and the input 2 of the input relay, the input 3 and the input 1 of the
- each input of a separate relay is indicated by Arabic numerals corresponding to the numbers indicating the inputs on such relays as shown on the Figures with the only purpose to simplify the identification of each input of a separate relay, and such indication may be substituted by verbal description
- the claimed method uses minimal number of elements, which have minimal dimensions, weight, and cost, particularly, one inductor, two semiconductor switches, and tree relays, interconnection of which also provide for minimal dimensions, weight, and cost whereby providing for the sufficient reliability of the regulation process in general.
- elements interconnections as well as consequence of operations with them allow to use an inductor and switches, which have several times smaller weight, dimensions, and cost, have much higher reliability.
- the provision for phase synchronism of input and output voltage in the proposed method conditions two fold decrease of the voltage on the switches, which allows for using switches of much smaller dimensions and weight.
- the modes of voltage addition and voltage subtraction which are realized in the proposed method, provide for minimum two fold decrease of the power accumulating in the inductor, which permits usage of an inductor with significantly smaller dimensions and weight.
- the assemblage of two switches, inductor, and three relays, which are used in the claimed method has smaller weight and dimensions as compared to the assemblage of the elements used in the closest analog.
- the claimed method provides for current continuity at the load input.
- the commutation of the input 3 with the input 2 of the input relay, input 3 with the input 1 of the parallel relay, and the input 3 with the input 1 of the output relay, as well as the commutation of the input 3 with the input 1 of the input relay, input 3 with the input 2 of the parallel relay, and input 3 with the input 2 of the output relay provides the possibility of operation and switching between the modes of increase and decrease of alternating voltage respectively using only one inductor and two switches, which also provides for maximum decrease of weight and dimensions of the elements assemblage, which is used in the process of alternating voltage regulation, increase of its reliability, and decrease of its cost.
- continuity of current is maintained at the input 2 of the parallel relay and at the input 1 of the output relay.
- Fig. 1 is an electrical functional circuit of a device, which embodies the method of alternating current voltage regulation
- Fig. 2 is an electrical functional circuit of an alternating voltage stabilizer, which embodies the method of alternating voltage regulation.
- the circuit which embodies the method of alternating voltage regulation (Fig. 1) comprises a series switch B, a parallel switch M, an inductor In, an input relay Ri, parallel relay R 2 , and an output relay R 3 .
- Input alternating voltage Uj n is fed to the input 2 of the parallel relay R 2 and
- Input alternating voltage XJ 1n using the parallel switch M, is converted into a sequence of pulse-width modulated bipolar pulses. Therewith, the duration of pulse-width modulated bipolar pulses determines the voltage value at the load.
- the charge energy is accumulated in the inductor In.
- Using the series switch B synchronous rectification of the accumulated in the inductor In. charge energy current is accomplished. Therewith, the parallel switch M and the series switch B are closed and opened in antiphase.
- Antiphase operation of the switches M and B provides for recuperation of the reactive energy in the case of nonlinear load. If the load is of reactive nature, then, because of the phase shift between the load current and voltage, appears reverse reactive current, which runs in the opposite direction to the network.
- the parallel switch M operates as a modulator
- the series switch B operates as a synchronous rectifier.
- the mode of alternating voltage increase is provided by commutation of the input 3 with the input 2 of the input relay Ri, the input 3 with the input 1 of the
- the mode of alternating voltage decrease is provided by commutation of the input 3 with the input 1 of the input relay Ri, the input 3 with the input 2 of the
- alternating voltage regulation method is a single-phase alternating voltage stabilizer (Fig. 2), designed for providing of electric power supply for various consumers under the conditions of large by value and duration voltage deviations in 220 voltage 50 Hz network with the range of operational input voltage of 120 V to 380 V, which provides for the coefficient of efficiency no less than 93 % with input voltage in the range 160 V to 240 V.
- the alternating voltage stabilizer (Fig. 2) comprises an intput low frequency filter LFFj n , an output low frequency filter LFF out , a series switch B, a parallel
- R3 and comprises a control circuit CC, which is connected to the control inputs of the switches and relay.
- the input low frequency filter LFFj n is connected to an alternating voltage
- frequency filter LFF 0Ut provide for filtering of high frequency components of the modulated voltage in the input voltage source circuit and the load.
- the antiphase operation of the switches M and B provides for recuperation of the reactive energy in the case of nonlinear load. If the load has a reactive nature, then, because of the phase shift between the load current and voltage, appears reverse reactive current, which runs back into the network.
- the parallel switch M operates as a modulator
- the series switch B operates as a synchronous rectifier.
- alternating voltage which is equal to or smaller than 220 V
- it works in the mode of voltage increase, which is provided by commutation of the input 3 with the input 2 of the input relay Ri, of the input 3
- antiphase control pulse-width modulated pulses are fed to the parallel switch M and series switch B, with the closure time of the switch M larger than the closure time of the switch B.
- the set of all of the above presented features contributes to obtaining of one common claimed engineering result, it is not a part of engineering level, and it does not explicitly result from engineering level, and can be used in industry.
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Abstract
The present invention relates to the field of electronics and automatics; particularly, it relates to the processes of conversion of alternating current energy at input into alternating current energy at output, so that the voltage to change without intermediate conversion into direct current, using devices utilizing semiconductor elements with control electrodes and elements designed for contacts closure and opening. The objective of the invention is the decrease of the weight and dimensions of the assemblage of the devices, which are used in the process of alternating voltage regulation, which will provide for the expanding of the field of usage of such process as well as the increase of reliability and cost decrease of the process by means of using different devices and different sequence of operations with them with simultaneous provision for continuity of the current at the load input. The specified objective is achieved by the method for alternating voltage regulation, according to which voltage is converted into a sequence of bipolar pulses of much higher frequency, as compared to the frequency of the input alternating voltage, the duration of which determines the regulated voltage, and said conversion is accomplished by antiphase closure and opening of two switches, according to the invention, the alternating voltage is fed to the input 2 of a parallel relay (R2) and to the input 2 of the input relay (R1), the input 3 of which is connected to the input of the inductor (In), and the input 1 is connected to the input 1 of the output relay (R3), the input 2 of which is connected to the common wire, and the input 3 is connected to the output of the series switch (B), the input of which is connected to the output of the inductor (In) and to the input of the parallel switch (M), the output of which is connected to the input 3 of the parallel relay (R2), the input 1 of which is connected to the common wire, and the load is connected to the input 1 of the output relay (R3), therewith, for increase of alternating voltage, the input 3 and input 2 of the input relay (R1), the input 3 and input 1 of the parallel relay (R2), and the input 3 and the input 1 of the output relay (R3), are commutated, and for decrease of alternating voltage, the input 3 and the input 1 of the input relay (R1), the input 3 and the input 2 of the parallel relay (R2), and the input 3 and the input 2 of the output relay, are commutated (R3).
Description
METHOD FOR ALTERNATING VOLTAGE REGULATION
The present invention relates to the field of electronics and automatics; particularly, it relates to the processes of conversion of alternating current energy at input into alternating current energy at output, so that the voltage to change without intermediate conversion into direct current, using devices utilizing semiconductor elements with control electrodes and elements designed for contacts closure and opening.
Alternating voltage regulation is used in electric power supply, automatics systems, alternating current electric drives, and many other electronic devices.
Such regulation is often realized using magnetic amplifiers, multiwinding transformers with thyristor commutation of windings, and various thyristor circuits, which change effective voltage value. The said methods, as a rule, employ devices that have relatively large weight and dimensions; they do not provide for desired limits of voltage regulation or distort voltage sine shape.
Therewith, presence of energy recuperation with reactive load is an important parameter which determines efficiency of the process of alternating voltage regulation. Energy recuperation is possible when there is a galvanic coupling between the source and consumer of electric power. However, usage of transformer devices in the processes of alternating voltage regulation does not provide for recuperation.
Methods employing autotransformer devices driven by an engine are also used for alternating voltage regulation. Usage of autotransformer devices provides for energy recuperation under the load of complex nature, however, these devices have relatively large weight and dimensions; their usage causes increase of expenses and low speed of the regulation process.
In the summary of the invention under the Russian Federation Patent No. 2266608 (IPC: H 02 M 03/22, H 02 M 07/527, G 05 F 01/56; published on 20.12.2005 in BuI. No. 35) there is disclosed a method of alternating current voltage smooth regulation.
According to the specified method, which is based upon conversion of alternating current voltage into the sequence of bipolar pulses of much higher frequency the duration of which determines the regulated voltage, the obtained pulses are fed through the high frequency transformer, which sets the regulation limits, to the synchronous rectifier the change of switches operation phase of which changes to the opposite the phase of the regulated output voltage to be obtained at the output of the filter, the latter to smooth disturbances.
The circuit of the device, which may be used for the embodiment of the described method of alternating voltage regulation, comprises an inverter, high frequency transformer, synchronous rectifier, and smoothing filter.
As one can see, the embodiment of the above method implies a large number of elements of relatively high weight and dimensions, particularly, high frequency transformer. Such method of alternating voltage regulation is relatively expensive and not sufficiently reliable because of the presence of six semiconductor switches. Besides, the presence of the transformer does not provide for the possibility of recuperation, considerably decreasing efficiency of the regulation process.
There is a method of alternating voltage increase at load (A. KopmyHOB,
"HMiryjibCHbie πpeoδpa3θBaτejiH Haπpfl>κeHHa πepeMeHHoro τoκa", "CHJioBaa 3jieκτpoHHκa", N° 1, 2006 p. cτop. 54-61 (A. Korshunov. Pulse alternating voltage converters. Power Electronics. 2006, No. 1. 54-61)) which uses only an inductor, parallel switch, and series switch, without transformer devices.
According to the said method, input alternating voltage is fed to the inductor input the output whereof is connected to the inputs of the parallel and series switches. The output of the series switch is connected to the load, and the output of the parallel switch is connected to the common wire.
Output voltage is regulated by change of duration of the closed position of the parallel switch, which is determined like follows: γ = τ / T = τ χ f, 0 < γ < l;
where: τ is the closed position time of the parallel switch during the period T = I / f of the input alternating voltage conversion into pulsed voltage; /is frequency of the parallel switch toggling.
Average output voltage Uout can be found from the following expression:
Uout = Uin / (I - γ);
where: Ujn is input alternating voltage.
The described method for alternating voltage increase at the load provides for continuous current at the output, implies the use of the inductor of relatively small dimensions and weight. Therewith, the output voltage is at the same phase with the input voltage. In this case, the energy recuperation is provided by the interrelation of on and off states of the parallel (τ duration) and series (T - τ duration) switches times or, in other words, by an antiphase control of the switches.
At the same time, the described method assumes the obtaining of intermittent current at the output and does not permit decrease of the alternating output voltage.
The same source contains the description of the method for alternating voltage decrease at the load without usage of transformer devices, which also implies the use of an inductor, a parallel switch and a series switch.
According to the said method the input alternating voltage is fed to the input of the series switch the output of which is connected to the input of the inductor and input of the parallel switch. The output of the parallel switch is connected to the common wire, and the load is connected to the inductor output.
The regulation of the output voltage according to this method is performed by changing of the duration of the series switch closed position, which is determined by the expression: γ = τ / T = τ χ f, 0 < γ < l ;
where: τ is closed position time of the parallel switch during the period T = 1 / f of the input alternating voltage pulses conversion into pulsed voltage; f is switching frequency of the parallel switch.
Therewith, the average value of the output voltage Uout may be determined by the expression:
where: Ujn is input alternating voltage.
The described method for alternating voltage decrease at the load provides for continuous current at the output, and implies the use of a relatively small by its dimensions and weight inductor. Therewith, the output voltage is in phase with the input voltage. In this case, energy recuperation is provided by the interrelation between the time of closed and open states of the parallel (τ duration) and series (T - τ duration) switches, or, in other words, by antiphase control of the switches.
At the same time, the described method assumes the obtaining of intermittent current at the output, and it does not permit the increase of the output alternating voltage.
The recuperation of the reactive energy issue is solved in both of the described alternating voltage regulation methods in the case of nonlinear load by the usage of four quadrant alternating current switches (for example, diode bridge with a power transistor (IGBT) in its diagonal, for which input and out have only conditional nature). If the load is of reactive nature, then, with allowance for the phase shift between the load current and voltage, reverse reactive current running back into the network appears; in this case the parallel switch operates as a modulator, and the series switch operates as a synchronous rectifier. The use of the last two described methods of alternating voltage regulation relative to one load of parallel connected inputs of the above described circuits of the elements connection, one of which is used for the increase of the output alternating voltage and the other one is used for the decrease of the output
alternating voltage using alternate commutation of the load through a relay with the circuit of the elements connection, which is used for the increase or decrease of alternating voltage, causes disruption of the load circuit at the switch moment. Besides, in this case, the dimensions and the weight of the elements used in the process increase two fold.
There is a method of alternating voltage regulation as described in the already mentioned source (A. KopπryHOB, "HMiryjiscHbie πpeo6pa3θBaτejiH Haπp5i>κeHH5i πepeMeHHoro τoκa", "CrnioBaa 3jieκτpoHκκa", JVb I5 2006 p. cτop. 54-61 (A. Korshunov. Pulse alternating voltage converters. Power Electronics. 2006, No. 1. 54-61), wherein only an inductor and two series switches without any transformer devices are used. This method allows for both increase and decrease of alternating voltage across one load.
According to the said method, the alternating voltage is fed to the input of the first series switch whereto the input of a parallel inductor and the input of the other parallel switch are connected. The output of the other parallel switch is connected to the load, and the output of the parallel inductor is connected to the common wire.
According to the said method, alternating voltage regulation is accomplished by change of the closed time of the first series switch, which is determined by the expression: γ = τ / T = τ χ f, 0 < γ < l ; where: τ is closed state time of the first series switch during the period T = 1 / f of input alternating voltage pulses into pulsed voltage; f is switching frequency of the parallel switch.
Therewith, the average value of the output voltage Uout is determined by the expression:
where: Ujn is the input alternating voltage.
The above method of alternating voltage regulation allows for both increase and decrease of voltage across one load, provides for recuperation, and uses a small number of elements, moreover it does not use transformer devices, which have considerable mass and dimensions. Such method is closest, by its technical essence, to the method of alternating voltage regulation claimed herein, and it has been selected as the closest analog.
At the same time, the described method for alternating voltage regulation assumes presence of intermittent current at the input and output of the used in this process elements connection circuit. Accounting for the fact that the output voltage is in antiphase with the input voltage, it is necessary to use high voltage power switches with the applied voltage, which exceeds the voltage in the last two described above methods of regulation by two times; this causes increase of dimensions, weight, and cost of this switches as well as decreases reliability of the regulation process. Besides, the described method uses an inductor, which accumulates energy in the whole power range, which is transferred to the load. This leads to increase of the weight, dimensions, and cost of this element and decreases reliability of the regulation process as well.
Thus, the specified drawbacks of the closest analog cause the increase of the weight and dimensions of the assemblage of the elements used in the regulation process and consequently limit the area of this device usage and cause cost increase and reliability of the process of alternating voltage regulation decrease as well.
Taking into account the above mentioned, the features of the closest analog that agree with the essential features of the proposed invention, are: conversion of voltage into sequence of bipolar pulses of much higher frequency as compared to the frequency of the input alternating voltage, which is regulated; said conversion is carried out by antiphase closure and breaking of two switches.
The objective of the invention is the decrease of the weight and dimensions of the assemblage of the devices, which are used in the process of alternating voltage regulation, which will provide for the expanding of the field of usage of
such process as well as the increase of reliability and cost decrease of the process by means of using different devices and different sequence of operations with them with simultaneous provision for continuity of the current at the load input.
The specified objective is achieved by the method for alternating voltage regulation, according to which voltage is converted into a sequence of bipolar pulses of much higher frequency, as compared to the frequency of the input alternating voltage, the duration of which determines the regulated voltage, and said conversion is accomplished by antiphase closure and opening of two switches, according to the invention, the alternating voltage is fed to the input 2 of the parallel relay and to the input 2 of the input relay, the input 3 of which is connected to the input of the inductor, and the input 1 is connected to the input 1 of the output relay, the input 2 of which is connected to the common wire, and the input 3 is connected to the output of the series switch, the input of which is connected to the output of the inductor and to the input of the parallel switch, the output of which is connected to the input 3 of the parallel relay, the input 1 of which is connected to the common wire, and the load is connected to the input 1 of the output relay, therewith, for increase of alternating voltage, the input 3 and the input 2 of the input relay, the input 3 and the input 1 of the parallel relay, and the input 3 and the input 1 of the output relay, are commutated, and for decrease of alternating voltage, the input 3 and the input 1 of the input relay, the input 3 and the input 2 of the parallel relay, and the input 3, and the input 2 of the output relay, are commutated. (herein each input of a separate relay is indicated by Arabic numerals corresponding to the numbers indicating the inputs on such relays as shown on the Figures with the only purpose to simplify the identification of each input of a separate relay, and such indication may be substituted by verbal description)
It is these features that are necessary and sufficient for the achievement of the specified objective.
As one can see, the claimed method uses minimal number of elements, which have minimal dimensions, weight, and cost, particularly, one inductor, two
semiconductor switches, and tree relays, interconnection of which also provide for minimal dimensions, weight, and cost whereby providing for the sufficient reliability of the regulation process in general. As opposed to the closest analog, elements interconnections as well as consequence of operations with them allow to use an inductor and switches, which have several times smaller weight, dimensions, and cost, have much higher reliability. Thus, the provision for phase synchronism of input and output voltage in the proposed method conditions two fold decrease of the voltage on the switches, which allows for using switches of much smaller dimensions and weight. Besides, the modes of voltage addition and voltage subtraction, which are realized in the proposed method, provide for minimum two fold decrease of the power accumulating in the inductor, which permits usage of an inductor with significantly smaller dimensions and weight. Thus, the assemblage of two switches, inductor, and three relays, which are used in the claimed method, has smaller weight and dimensions as compared to the assemblage of the elements used in the closest analog. Herewith, the claimed method provides for current continuity at the load input.
When alternating voltage is fed to the input 2 of the parallel relay and to the input 2 of the input relay, the input 3 of which is connected to the input of the inductor, and the input 1 is connected to the input 1 of the output relay, the input 2 of which is connected to the common wire, and the input 3 is connected to the output of the series switch, the input of which is connected to the output of the inductor and to the input of the parallel switch, the output of which is connected to the input 3 of the parallel relay, the input 1 of which is connected to the common wire, and connection of the load to the input 1 of the output relay is realized, the possibility of increase and decrease of alternating voltage is provided for using the same elements. Therewith, current continuity at the input and output is provided for, the voltage across the switches is decreased by two times, the power accumulating in the inductor is decreased, which allows for maximum decrease of weight and dimensions of the elements assemblage, used in the process of
alternating current voltage regulation, for increase of its reliability and decrease of its cost.
The commutation of the input 3 with the input 2 of the input relay, input 3 with the input 1 of the parallel relay, and the input 3 with the input 1 of the output relay, as well as the commutation of the input 3 with the input 1 of the input relay, input 3 with the input 2 of the parallel relay, and input 3 with the input 2 of the output relay provides the possibility of operation and switching between the modes of increase and decrease of alternating voltage respectively using only one inductor and two switches, which also provides for maximum decrease of weight and dimensions of the elements assemblage, which is used in the process of alternating voltage regulation, increase of its reliability, and decrease of its cost. Herewith, continuity of current is maintained at the input 2 of the parallel relay and at the input 1 of the output relay.
Thus, the set of the cited above features contributes to the obtaining of one common claimed engineering result.
The essence of the invention is explained with the following drawings.
Fig. 1 is an electrical functional circuit of a device, which embodies the method of alternating current voltage regulation;
Fig. 2 is an electrical functional circuit of an alternating voltage stabilizer, which embodies the method of alternating voltage regulation.
The circuit, which embodies the method of alternating voltage regulation (Fig. 1) comprises a series switch B, a parallel switch M, an inductor In, an input relay Ri, parallel relay R2, and an output relay R3.
Input alternating voltage Ujn is fed to the input 2 of the parallel relay R2 and
to the input 2 of the input relay Ri, the input 3 of which is connected to the input of the inductor In, and the input 1 is connected to the input 1 of the output relay R3, the input 2 of which is connected to the common wire, and the input 3 is connected to the output of the series switch B, the input of which is connected to
the output of the inductor In and input of the parallel switch M, the output of which is connected to the output of the inductor and the input of the parallel switch, the output of which is connected to the input 3 of the parallel relay R2 , the input 1 of which is connected to the common wire. A load is connected to the input 1 of the output relay R3.
Input alternating voltage XJ1n, using the parallel switch M, is converted into a sequence of pulse-width modulated bipolar pulses. Therewith, the duration of pulse-width modulated bipolar pulses determines the voltage value at the load. The charge energy is accumulated in the inductor In. Using the series switch B, synchronous rectification of the accumulated in the inductor In. charge energy current is accomplished. Therewith, the parallel switch M and the series switch B are closed and opened in antiphase.
Antiphase operation of the switches M and B provides for recuperation of the reactive energy in the case of nonlinear load. If the load is of reactive nature, then, because of the phase shift between the load current and voltage, appears reverse reactive current, which runs in the opposite direction to the network. In this case, the parallel switch M operates as a modulator, and the series switch B operates as a synchronous rectifier.
The mode of alternating voltage increase is provided by commutation of the input 3 with the input 2 of the input relay Ri, the input 3 with the input 1 of the
parallel relay R2, and the input 3 with the input 1 of the output relay R3.
The mode of alternating voltage decrease is provided by commutation of the input 3 with the input 1 of the input relay Ri, the input 3 with the input 2 of the
parallel relay R2, and the input 3 and the input 2 of the output relay R3.
Therewith, using antiphase closure and opening of the parallel switch M and series switch B, conversion of voltage into bipolar pulses of much higher
frequency, relative to the frequency of the input alternating voltage, the duration of which determines the regulated voltage, is accomplished.
One of the possible variants of embodiment of the claimed alternating voltage regulation method is a single-phase alternating voltage stabilizer (Fig. 2), designed for providing of electric power supply for various consumers under the conditions of large by value and duration voltage deviations in 220 voltage 50 Hz network with the range of operational input voltage of 120 V to 380 V, which provides for the coefficient of efficiency no less than 93 % with input voltage in the range 160 V to 240 V.
The alternating voltage stabilizer (Fig. 2) comprises an intput low frequency filter LFFjn, an output low frequency filter LFFout, a series switch B, a parallel
switch M, an inductor In, an input relay Ri, a parallel relay R2, an output relay
R3, and comprises a control circuit CC, which is connected to the control inputs of the switches and relay.
The input low frequency filter LFFjn is connected to an alternating voltage
source, and the output of the output low frequency filter LFFout is connected to a load, for example, electric engine. Input alternating voltage is converted into a series of pulse-width modulated bipolar pulses using the parallel switch M. Therewith, the duration of the pulse-duration modulated bipolar pulses determines the voltage value at the load. The charge energy is accumulated in the inductor In. Using the series switch B, synchronous rectification of the charge accumulated in the inductor In discharge current is accomplished. Therewith, the switches M and B operate in antiphase. Using the control circuit CC, antiphase toggling of the switches M and B is provided with the frequency much higher than that of the input alternating voltage. The low frequency input filter LFFjn and the output low
frequency filter LFF0Ut provide for filtering of high frequency components of the modulated voltage in the input voltage source circuit and the load.
The antiphase operation of the switches M and B provides for recuperation of the reactive energy in the case of nonlinear load. If the load has a reactive nature, then, because of the phase shift between the load current and voltage, appears reverse reactive current, which runs back into the network. In this case, the parallel switch M operates as a modulator, and the series switch B operates as a synchronous rectifier.
If alternating voltage, which is equal to or smaller than 220 V, is fed to the input of the stabilizer, it works in the mode of voltage increase, which is provided by commutation of the input 3 with the input 2 of the input relay Ri, of the input 3
with the input 1 of the parallel relay R2, and the input 3 with the input 1 of the
output relay R3. Therewith, antiphase control pulse-width modulated pulses are fed to the parallel switch M and series switch B, with the closure time of the switch M larger than the closure time of the switch B.
If alternating voltage exceeding 220 V is fed to the stabilizer input, it operates in the mode of voltage decrease, which is provided by commutation of the input 3 with the input 1 of the input relay Ri, the input 3 with the input 2 of the
parallel relay R2, and the input 3 and input 2 of the output relay R3.
As can be seen, the set of all of the above presented features contributes to obtaining of one common claimed engineering result, it is not a part of engineering level, and it does not explicitly result from engineering level, and can be used in industry.
The above described method of alternating voltage regulation, as compared to the existing analogs, allows for maximum decrease of the weight and dimensions of the assemblage of the elements used in the process of alternating voltage regulation, increase of reliability, and decrease of the cost of this process.
Claims
What is claimed is:
A method for alternating voltage regulation, according to which voltage is converted into a sequence of bipolar pulses of much higher frequency, as compared to the frequency of the input alternating voltage, the duration of which determines the regulated voltage, and said conversion is accomplished by antiphase closure and opening of two switches, which differs in that the alternating voltage is fed to the input 2 of a parallel relay and to the input 2 of the input relay, the input 3 of which is connected to the input of the inductor, and the input 1 is connected to the input 1 of the output relay, the input 2 of which is connected to the common wire, and the input 3 is connected to the output of the series switch, the input of which is connected to the output of the inductor and to the input of the parallel switch, the output of which is connected to the input 3 of the parallel relay, the input 1 of which is connected to the common wire, and the load is connected to the input 1 of the output relay, therewith, for increase of alternating voltage, the input 3 and the input 2 of the input relay, the input 3 and the input 1 of the parallel relay, and the input 3 and the input 1 of the output relay, are commutated, and for decrease of alternating voltage, the input 3 and the input 1 of the input relay, the input 3 and the input 2 of the parallel relay, and the input 3, and the input 2 of the output relay, are commutated.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| UAU200703976 | 2007-04-10 | ||
| UAU200703976U UA28297U (en) | 2007-04-10 | 2007-04-10 | Method for control of value of alternating voltage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2008123839A1 true WO2008123839A1 (en) | 2008-10-16 |
Family
ID=39228775
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/UA2007/000072 WO2008123839A1 (en) | 2007-04-10 | 2007-11-29 | Method for alternating voltage regulation |
Country Status (2)
| Country | Link |
|---|---|
| UA (1) | UA28297U (en) |
| WO (1) | WO2008123839A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113014079A (en) * | 2019-12-19 | 2021-06-22 | 东元电机股份有限公司 | Frequency converter device and method for selectively outputting current according to output voltage value |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6822606B2 (en) * | 2018-12-17 | 2021-01-27 | 富士電機株式会社 | DC-DC converter device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH688066A5 (en) * | 1994-03-04 | 1997-04-30 | Ascom Frako Gmbh Stromversorgu | AC=DC converter using book- /boost-principle |
| WO2000039653A1 (en) * | 1998-12-30 | 2000-07-06 | Advanced Energy Industries, Inc. | A method and system for alternating current regulation |
-
2007
- 2007-04-10 UA UAU200703976U patent/UA28297U/en unknown
- 2007-11-29 WO PCT/UA2007/000072 patent/WO2008123839A1/en active Application Filing
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH688066A5 (en) * | 1994-03-04 | 1997-04-30 | Ascom Frako Gmbh Stromversorgu | AC=DC converter using book- /boost-principle |
| WO2000039653A1 (en) * | 1998-12-30 | 2000-07-06 | Advanced Energy Industries, Inc. | A method and system for alternating current regulation |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113014079A (en) * | 2019-12-19 | 2021-06-22 | 东元电机股份有限公司 | Frequency converter device and method for selectively outputting current according to output voltage value |
| CN113014079B (en) * | 2019-12-19 | 2022-02-01 | 东元电机股份有限公司 | Frequency converter device and method for selectively outputting current according to output voltage value |
Also Published As
| Publication number | Publication date |
|---|---|
| UA28297U (en) | 2007-12-10 |
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