WO2000027018A1 - Generateur d'ondes a hautes performances - Google Patents

Generateur d'ondes a hautes performances Download PDF

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Publication number
WO2000027018A1
WO2000027018A1 PCT/US1999/025649 US9925649W WO0027018A1 WO 2000027018 A1 WO2000027018 A1 WO 2000027018A1 US 9925649 W US9925649 W US 9925649W WO 0027018 A1 WO0027018 A1 WO 0027018A1
Authority
WO
WIPO (PCT)
Prior art keywords
voltage levels
direct current
alternating current
circuit
switching circuit
Prior art date
Application number
PCT/US1999/025649
Other languages
English (en)
Inventor
L. Jonathan Kramer
Original Assignee
Drexelbrook Controls, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Drexelbrook Controls, Inc. filed Critical Drexelbrook Controls, Inc.
Priority to AU13355/00A priority Critical patent/AU1335500A/en
Publication of WO2000027018A1 publication Critical patent/WO2000027018A1/fr

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Classifications

    • 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/483—Converters with outputs that each can have more than two voltages levels
    • H02M7/487—Neutral point clamped inverters

Definitions

  • the present invention relates to the field of power inversion. More particularly, the invention relates to the efficient generation of alternating current (AC) signals from direct current (DC) power.
  • AC alternating current
  • DC direct current
  • the present invention is a high-efficiency device for generating alternating current signals from direct current power.
  • the high-efficiency device comprises a plurality of direct current voltage levels, a polarity switching circuit, and a voltage level selecting circuit.
  • the plurality of direct current voltage levels is provided by one or more direct current voltage sources, and comprises a ground potential level.
  • the voltage level selecting circuit is selectively coupled to at least one of the plurality of direct current voltage levels.
  • the voltage level selecting circuit selects at least one of the plurality of direct current voltage levels, and provides the selected voltage levels to the polarity switching circuit.
  • the voltage level selecting circuit may provide each of the selected voltage levels sequentially, and in discrete time intervals.
  • the polarity switching circuit which comprises a transformer element, may reverse the polarity of the selected voltage levels and output an alternating current signal with a desired frequency.
  • the high-efficiency device may also comprise a filtering circuit coupled to the polarity switching circuit. In this case, the filtering circuit outputs the alternating current signal of the desired frequency, while eliminating other alternating current signals whose frequencies are different from the desired frequency.
  • a method for use in a process control system.
  • the method comprises providing a plurality of direct current voltage levels, selecting at least one of the plurality of direct current voltage levels, determining a polarity of the selected voltage levels, and outputting an alternating current signal of a desired frequency.
  • the method may further comprise the step of filtering the selected voltage levels.
  • Figure 2 is graph of a stepped DC square wave, an AC wave at a desired frequency, and an AC wave at an undesired harmonic frequency created by the high-efficiency device for generating alternating current signals from direct current power;
  • Figure 3 is a schematic diagram of a preferred embodiment of a high-efficiency device for generating alternating current signals from direct current power
  • Figure 4 is a table of the port output sequence for a tone burst generator located in the preferred embodiment of the high-efficiency device for generating alternating current signals from direct current power;
  • Figure 5 is a graph of the desired AC wave and the corresponding port output sequence of a pulse tone generator; and Figure 6 is a schematic diagram of another preferred embodiment of a high- efficiency device for generating alternating current signals from direct current power.
  • Figure 1 shows a block diagram of a device 111 for efficiently generating alternating current (AC) signals from direct current (DC) power.
  • a first DC voltage level 101 is provided to a voltage level selecting circuit 106 by conductor 104.
  • a second DC voltage level 102 is provided to voltage level selecting circuit 106 by conductor 105.
  • first DC voltage level 101 and second DC voltage level 102 are provided by one DC power supply 112, where second DC voltage level 102 represents ground potential.
  • a third DC voltage level 103 may be provided to voltage level selecting circuit 106 by another DC power supply 113.
  • DC power supply 113 may be interconnected to DC power supply 112 by conductor 116.
  • Voltage level selecting circuit 106 is coupled to polarity switching circuit 109 by conductors 110 and 118. Voltage level selecting circuit 106 may select one or more of available voltage levels 101, 102, and 103, and apply the selected voltage levels to polarity switching circuit 109. In this way, the voltage level available at polarity switching circuit 109 may be varied, depending on which of available voltage levels 101, 102, 103 are selected by voltage level selecting circuit 106. For example, voltage level selecting circuit 106 may select second DC voltage level, set at a ground potential, and first voltage level 101 , set at +9.6 volts DC. When the selected ground potential is combined with the +9.6 volts DC, +9.6 volts DC is available at polarity switching circuit 109.
  • a timing circuit 114 is coupled to voltage level selecting circuit 106 by conductor 115, and to polarity switching circuit 109 by conductor 117. Timing circuit 114 conducts timing and sequencing techniques on voltage level selecting circuit 106 in order to generate a sequence of stepped DC voltage square waves for a definite interval. Timing circuit 114 also provides a signal to polarity switching circuit 109 in order to determine the proper polarity of each DC voltage square wave. The value of the time interval can be varied depending on the desired frequency of the AC sinusoidal wave.
  • timing circuit 114 may allow voltage level selecting circuit 106 to select first DC voltage level 101 (set at +9.6 volts DC) and second DC voltage level 102 (set at ground potential) for a 2 microsecond time interval.
  • first DC voltage level 101 set at +9.6 volts DC
  • second DC voltage level 102 set at ground potential
  • polarity switching circuit 109 may reverse the polarity of the selected DC voltage levels. Alternatively, polarity switching circuit 109 may maintain the polarity provided by voltage level selecting circuit 106. In this way, device 111 can create the required positive and negative voltage portions of desired AC sinusoidal wave 202.
  • Filtering circuit 107 may be coupled to polarity switching circuit 109 by conductors 111 and 119. Filtering circuit 107 removes other undesired AC sinusoidal waves 203 with frequencies that are different from the desired frequency.
  • Figure 2 is graph of stepped DC square wave 201 , AC wave at the desired frequency 202, and AC wave at an undesired harmonic frequency 203. As noted in the graph, stepped DC square wave 201 imitates the form of AC wave at desired frequency 202.
  • amplitudes there are nine distinct amplitudes: a first amplitude 204 at 0 volts DC; a second amplitude 205 at 9.6 volts DC; a third amplitude 206 at 15 volts DC; a fourth amplitude 207 at 9.6 volts DC; a fifth amplitude 208 at 0 volts DC; a sixth amplitude 209 at -9.6 volts DC; a seventh amplitude 210 at -15 volts DC; an eighth amplitude 211 at -9.6 volts DC; and a ninth amplitude 212 at 0 volts DC.
  • nine amplitudes are shown, it should be appreciated that there may be any number of distinct amplitudes.
  • FIG. 3 shows a detailed schematic diagram of a preferred embodiment of a high-efficiency device for generating alternating current signals from direct current power. Specifically, Figure 3 details timing circuit 114, voltage level selecting circuit 106, filtering circuit 107 and polarity switching circuit 109. The preferred embodiment employs two power supplies, a +9.6 volt power supply 301 and a -5.4 volt power supply 302.
  • Timing circuit 114 comprises a tone burst generator 303 that provides the sequencing and timing for the preferred device.
  • Output ports PA0, PA1, PB1, PB0 and PA4 of tone burst generator 303 provide the timing and sequencing output signals to voltage level selecting circuit 106.
  • Figure 4 is a table of the port output sequence for tone burst generator 303 in the preferred embodiment. Although Figure 4 shows tone burst generator 303 having a port output sequence with eleven distinct time states, it should be appreciated that any number of time states may be employed.
  • output port PA4 is low (i.e., 0) and output ports PA1, PA0, PB1, and PB0 are high (i.e., 1).
  • Transistors 309 and 310 are open, allowing current flow across pull-up resistors 305, 306,
  • tone burst generator 303 permits transistors 311 , 312, 313, and 314 to conduct, there is no power supplied to transistors 311, 312, 313, and 314. As a result, power supplies 301 and 302 are disconnected from output transformer 304 by transistors 315, 316, 317, and 318. In tone burst generator's 303 "0" time state, PA4 goes high. Transistor 309 and 310 now conduct, allowing current flow through pull-up resistors 305, 306, 307, and
  • transistors 311, 312, 313, and 314 are conducting, current flows from +9.6 volt power supply 301 back to -5.4 volt power supply 302.
  • Transistor 315 conducts a ground signal to the positive polarity side of output transformer 304.
  • the +9.6 volts on output transformer 304 as provided by 9.6 volt power supply 301, now has a reference ground potential. Accordingly, +9.6 volts DC is available at output transformer 304.
  • the duration of the pulse in which PA0 goes low determines the duration of the DC signal.
  • the resultant signal is a rectangular wave with an amplitude of 9.6 volts DC and a width equal to the duration of one time state. In the above example, one time state set at 2 microseconds will generate a 50 kilohertz wave.
  • PB0 In time states "7" and "8,” PB0 returns high and PBl goes low and opens corresponding transistor 314. As a result, available current through resistor 308 energizes the gate of transistor 318. Transistor 318 conducts the -5.4 volt signal to the negative polarity side of output transformer 304. The -9.6 volts on output transformer 304, as provided by 9.6 volt power supply 301, now is in series with the -5.4 volts from transistor 318. Accordingly, -15 volts DC is available at output transformer 304. As shown in Figure 5, the duration of the pulse in which PBl goes low determines the duration of the DC signal. The resultant signal is a rectangular wave with an amplitude of -15 volts and a width equal to the duration of two time states.
  • time state "9” PBl returns high and PBO again goes low and the operation described for time state “6" is repeated.
  • the sequence of time states “0” through “9” may be repeated as often as is required by the application, after which time the "off state is repeated.
  • Figure 5 shows a graphical comparison of port outputs PAO, PA 1, PBl, PBO and PA4 (discussed above) to desired AC sinusoidal wave 202, stepped square wave 201, and undesired harmonic wave 203.
  • FIG 5 when an output port on tone burst generator 303 goes low for a distinct period of time, one step in stepped square wave 201 is formed.
  • the port outputs, and thus the individual steps, are sequenced to imitate AC sinusoidal wave of the desired frequency 202.
  • FIG 6 is a schematic diagram of another preferred embodiment of a high- efficiency device for generating alternating current signals from direct current power.
  • one +9.6 volt DC power supply 601 is used instead of two DC power supplies 301 and 302, used in the previous embodiment (as shown in Figure 3).
  • this embodiment employs a multi-tapped transformer 602 to generate the required range of amplitudes for the resultant square wave (as shown in Figure 2).
  • multi-tapped transformer 602 may have nine turns on its inner winding and five turns on its outer winding, and thus provide square waves whose peak amplitudes are nine and fourteen volts DC.
  • Timing circuit 114 comprises a tone burst generator 603.
  • tone burst generator's 603 "off state output port PA4 is low and output ports PA1, PAO, PBl, and PBO are high. This means that transistors 604 and 605 are open.
  • transistors 606, 607, 608, and 609 are conducting, there is no power supplied to transistors 606, 607, 608, and 609. As a result, power supply 601 is disconnected from output transformer 602 by transistors 614, 615, 616, and 617.
  • the duration of the pulse in which PN0 goes low determines the duration of the DC signal.
  • the resultant signal is a rectangular wave with an amplitude of 9.6 volts DC and a width equal to the duration of one time state.
  • time states "2" and "3” PN0 returns high and PN1 goes low and opens corresponding transistor 607.
  • available current through resistor 611 energizes the gate of transistor 615.
  • Transistor 615 conducts a ground signal to the positive polarity side of output transformer 602.
  • the resultant signal is a rectangular wave with an amplitude of +15 volts DC and a width equal to the duration of two time states.
  • time state "9” PBl returns high and PBO again goes low and the operation described for time state “6" is repeated.
  • the sequence of time states “0” through “9” may be repeated as often as is required by the application, after which time the "off state is repeated.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)

Abstract

L'invention concerne un dispositif (111) à hautes performances conçu pour produire des signaux de courant alternatif à partir de courant continu. Le dispositif (111) comporte plusieurs niveaux (101-103) de tension continue, un circuit (109) de changement de polarité et un circuit de sélection du niveau de tension (106). Le circuit de sélection (106) du niveau de tension est accouplé de manière sélective à au moins un des niveaux (101-103) de tension continue. Le circuit de sélection (106) du niveau de tension sélectionne au moins un des niveaux (101-103) de tension continue, et fournit les niveaux de tension sélectionnés au circuit (109) de changement de polarité. Le circuit de sélection (106) du niveau de tension peut fournir chacun des niveaux de tension sélectionnés de façon séquentielle et à des intervalles de temps distincts. Le circuit (109) de changement de polarité qui comprend un élément (304) transformateur, peut inverser la polarité des niveaux de tension sélectionnés et émettre un signal de courant alternatif à une fréquence voulue. Le dispositif (111) à hautes performances peut également comporter un circuit de filtrage (107) accouplé au circuit (109)de changement de polarité. Dans ce cas précis, le circuit de filtrage (107) émet le signal de courant alternatif à la fréquence voulue, tout en éliminant les autres signaux de courant alternatif dont les fréquences sont différentes de la fréquence voulue.
PCT/US1999/025649 1998-11-03 1999-11-03 Generateur d'ondes a hautes performances WO2000027018A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU13355/00A AU1335500A (en) 1998-11-03 1999-11-03 High efficiency wave generator

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US10676898P 1998-11-03 1998-11-03
US60/106,768 1998-11-03

Publications (1)

Publication Number Publication Date
WO2000027018A1 true WO2000027018A1 (fr) 2000-05-11

Family

ID=22313137

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1999/025649 WO2000027018A1 (fr) 1998-11-03 1999-11-03 Generateur d'ondes a hautes performances

Country Status (2)

Country Link
AU (1) AU1335500A (fr)
WO (1) WO2000027018A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3100851A (en) * 1959-11-03 1963-08-13 Ling Temco Vought Inc High power synthetic waveform generator
US3227889A (en) * 1961-12-15 1966-01-04 Gen Electric D. c. to a. c. transistor converters
US3832643A (en) * 1972-09-21 1974-08-27 Raytheon Co Minimal dissipation power controller
US4628438A (en) * 1983-12-16 1986-12-09 Control Concepts Corporation Power converter apparatus and method employing plural branches

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3100851A (en) * 1959-11-03 1963-08-13 Ling Temco Vought Inc High power synthetic waveform generator
US3227889A (en) * 1961-12-15 1966-01-04 Gen Electric D. c. to a. c. transistor converters
US3832643A (en) * 1972-09-21 1974-08-27 Raytheon Co Minimal dissipation power controller
US4628438A (en) * 1983-12-16 1986-12-09 Control Concepts Corporation Power converter apparatus and method employing plural branches

Also Published As

Publication number Publication date
AU1335500A (en) 2000-05-22

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