• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A process of pulse duration modulation for improved voltage and frequency efficiency of a multi-phase converter. The sum of the time dependent voltage of a load phase and of an auxiliary time dependent voltage is formed, wherein the auxiliary time dependent voltage is the same for all converter phases. The pulse duration of the output voltage of each converter phase is modulated with said voltage sum.
    公开号:SU881996A1
    申请号:SU772489909
    申请日:1977-06-07
    公开日:1981-11-15
    发明作者:Кртек Ян
    申请人:Чкд Прага, Оборовы Подник (Инопредприятие)；
    IPC主号:
    专利说明:

    The invention relates to a pulse technique and can be used in DC-AC converters.
    A known method of pulse width modulation, based on the fact that the output 5th voltage of each phase / converter is modulated in width by the corresponding time function til,
    However, the known method has a relatively low conversion efficiency due to the fact that with an increase in the modulating and carrier frequencies of each phase of the converter, the number of harmonics constituting the spectrum of the B1 - ) 5 input voltage decreases, while the ratio of the carrier and modulating frequencies decreases and, accordingly, the frequency response of the converter . 20
    A known method of pulse-width modulation for converters of direct current to alternating current, based on modulation of the output voltage of each phase by a variable function of time [2].
    However, this method has a low conversion efficiency, due to the same reasons.
    The purpose of the invention is to increase the conversion efficiency.
    This goal is achieved by the fact that according to the method of pulse-width modulation for DC-to-AC converters, based on modulating the output voltage of each phase with a variable function of time, the output voltages of the individual phases are modulated by the sum of an adjustable time voltage function for the corresponding load phase and an additional adjustable time voltage function , which is the same for all phases of the output voltage.
    where ^ d ^, 1.9> ax 1
    MS <1, b] ^ n |
    In this case, an additional adjustable time voltage function can take the following forms:
    - phase loads;
    - adjustable time function of voltage on individual phase loads, which has the greatest instantaneous value at the moment;
    - an adjustable time function of voltage at individual phase loads, which has a minimum instantaneous value at a given moment;
    - an adjustable time function of the voltage at individual phase loads, 'which has an absolutely maximum value at the moment; determines the sign of the adjustable time voltage function;
    - the maximum value of the modulated voltage, which is determined by adjacent pulses;
    where ^ 14 mak0 ' and 1 MIII ' adjustable— '' are the temporary voltage functions for individual phase loads that have the largest or smallest instantaneous values at the given moment, respectively;
    3lt) a siojn [5 11 (1 | ^ | <11lax | m- [e 1111b ] | 1max | where ^ n ^ iayu ") adjustable time 1 function of voltage at phase loads, which has doubled absolute value at the moment;
    QWidUCl - defines the sign of the regu lated time voltage function.
    In FIG. 1 shows a diagram of a three-phase converter that implements this method, which is loaded on a three-phase load connected by a star with resistance 2.
    Voltage (Jq_ 0 and are the output voltages of the individual phases of the inverter, and the voltage | y_)) (Λ is the voltage at individual load F 10 Zech.
    In FIG. Figure 2c shows the sinusoidal modulating signals, which in this case are equal to the sinusoidal voltages at the load 15 1 which modulate the output voltage pulses, (Jn., Individual phases of the converter. In this case, the modulation can be carried out directly by comparing the modulating function 20 and the triangular carrier frequency identical for all phases.
    In FIG. 2-6 show the change in the output voltage Ujp of one phase of the converter; in FIG. 2c — change in the voltage U 4 by ^ 5 in the corresponding working phase, from which harmonics that do not form a three-fae system are excluded.
    In FIG. Figure 3 shows an example when an additional time function forms 30 so that its instantaneous value is equal to half the sum of the instantaneous value of the sinusoidal voltage at a load of 5 ^ -9 a, which currently has the largest (positive
    35. new) value, and the signal that currently has a minimum (negative) value.
    In FIG. Behind the sinusoidal voltages on the individual the phases of the load are 40 and 5 And | / the adjustable function is 6, and the modulating functions are < , which modulate the pulses in the output voltages of the individual phases.
    In FIG. Zb> shows the output voltage 11.0 of the phase of the converter, which does not yet contain a full modulating signal ^ = 5, + 3, in FIG. Зс - voltage 6, in the corresponding phase of the load.
    $ 0 In FIG. Figure 4 shows the case when an adjustable function is formed in such a way that its instantaneous value is equal to the difference between the maximum adjustable value of M and the instantaneous value of that time function 5 and -S3, which has the greatest value in a given period, and the maximum promotion is Audited the value is taken with the same
    881996 6 characteristics can have a smaller amplitude than U up to the ratio l / Sih 6СР. For example, in a three-phase converter, the amplitude of the sinusoidal voltage at the S load can be increased by 1 / Sin 60 °, i.e. by 15.5%.
    权利要求:
    Claims (5)
    [1]
    (54) METHOD OF WIDTH-PULSE MODULATION FOR DC CONVERTERS The invention relates to a pulse technique and can be used in direct-current-to-current converters. The known method of pulse-width modulation is based on the fact that the output voltage of each phase i transforms the width of the corresponding time function L13. However, the known method has a relatively low conversion efficiency due to the fact that with increasing modulation and carrier frequencies. Each phase of the converter reduces the number of harmonics that make up the output voltage spectrum, while decreasing the carrier-to-modulating frequency ratio and, accordingly, reducing the frequency response of the converter. The known method of pulse-width modulation for DC-to-AC converters is based on V-VARIABLE modulation of the output voltage of the phase by the intersecting function of time 2. However, this method has a low conversion efficiency due to the same reasons. The purpose of the invention is to increase the conversion efficiency. This goal is achieved by the fact that, according to the pulse-width modulation method for DC-AC converters based on modulating the output voltage of each phase by a variable time function, the output voltages of individual phases are modulated by the sum of the adjustable time function of the voltage on the corresponding the load phase and the additional adjustable time voltage function, which is the same for all phases of the output voltage. At the same time, the additional poi-ydable temporal function of the voltage1 can have the following types:, lMd., MHHl, (- phase loads; all - adjustable time function of the voltage on individual phase loads that has the greatest instantaneous value at the given moment; chd3 - adjustable time function of the voltage on the individual phase loads which is of the minimum instantaneous value at the moment;: itl-siojn Zl, and, where {§ | cs1Xs | is the adjustable time, the function of the voltage on the individual phase loads which has absolutely maximum the current value; S1q; ntS nJllMqnol - determines the sign of the adjustable time function on the yarn; - the maximum value of the modulated voltage that is determined by the adjacent impulses; (t) (Kcl ml (ZY, D1mi gdvG5 ,,,. “OI,“. Rvgu ™ of a voltage across individual phase loads, which have the highest or lowest instantaneous values at the moment, respectively; (± s ,,, iawqKc | Gder; dp ia1 “| Adjustable time function of the phase voltage loads, which has a doubled absolute value at the given moment; - J1 D 1C | "1 - defines the sign of the regulated voltage time function. Phage, 1 shows a three-phase converter circuit that implements this method, which is loaded on a three-phase star with a resistance of 2. The voltages U and (Jy are the output voltages of the individual phases of the converter, and the voltages, J are the voltages in separate phases of the load .In Fig. 2a, the modulating signals of a sinusoidal form are shown, which in this case are equal to the sinusoidal voltages on the load S, | iSn, Sj, which are used to modulate the output, voltage, CL, and output phases GFY This modulation can be carried out directly by matching the modulating function and a triangular carrier path, the same for all phases. Fig. 2 shows the change in output voltage (one phase of the converter; Fig. 2c shows the change in voltage The working phase, from which the harmonics are excluded, does not form a three-phase system. In Fig. 3, an example is shown when the additional temporal function is formed in such a way that its instantaneous value is half the sum of the instantaneous value sinusoidal voltage across the load, which currently has the highest (new positive) value and a signal which currently has the minimum (negative) value. FIG. The sinusoidal voltages on the individual phases of the load are -,. „, Oh, fucc, e is a) and the modulating functions are .S + ainif sSij + aimjs-S - (which modulate the pulses in the output voltages separate phases. On ({sig. Zo shows the output voltage U-IJJ of the phase converter, which does not yet contain the full modulating signal, (3, in Fig. 3c - the voltage U in the corresponding phase of the load. Fig. 4 shows the case when an adjustable is formed in such a way that its instantaneous value is equal to the difference between the maximum adjustable sign M and the instantaneous value of that time function 5 -Si, which in this period has the highest value, the maximum modulated value being taken with the same sign as the instantaneous process value, which is subtracted from it. In Fig. 4, the time functions on the load are S Sui) which regu- tirugates the temporal function and the pyrotope temporal functions wi m, (3, mc, e5 ,,. In Fig. 4c, the temporal function of the center, which is the output voltage of the phase, is shown; in fig. 4c is a temporary function at the corresponding phase of the load. In FIG. Figure 5 shows the case when the adjustable time function 4 is formed as the difference between the maximum modulated value A and the time function of the voltage at the load phase which currently has the two highest values, and the same sign of the maximum modulated value W is taken, as well as the temporary voltage functions. on separate loads. FIG. 5 l shows the time functions d at loads 9, SlJ, S,, adjustable time function and modulating time functions (., Vtirt 6ft + d, a as well as the maximum modulated value M. Figure 56 shows the change in the output voltage of one load phase Fig. 5c shows the time function at the corresponding phase of the load. Fig. 6 shows the case when the adjustable time function E is formed as the difference of the maximum modulated value of M in that time function at the phases of the loads, which currently has the maximum and The minimum functions are shown in FIG. 2b, the time functions on the load 5, 5, Sj, the time functions and the modulating functions w, mQ Sijtol, vn, + a, as well as the maximum modulated value M are shown. In Fig. 6) the change is shown output voltage C single load phase; in fig. 6c is the change in the corresponding phase of the load. When using this method of pulse-width modulation, the amplitude of the modulated sinusoidal voltage on the load is limited by the value of / 2 / Sin QO ° l, 155xUoI / 2. This means that with the same transducer, the amplitude adjustment of the sinusoidal output voltage increases by approximately 15.5%. This is due to the fact that the sum of the given time characteristics JS and the obtained time hairs of the moduli cj (t) may have a smaller amplitude than U to the ratio l / Sih 60. For example, in a three-phase converter, the amplitude of the synssiadal voltage on the load can be increased by I / sin bo, i.e. ,five%. Claim 1. Method of pulse-width modulation for direct-to-current converters based on modulating the output voltage of each phase by a variable function of time, characterized in that, in order to increase the conversion efficiency, the output voltages of individual phases are modulated by the sum of polarized the time function of the voltage at the corresponding phase of the load and the additional adjustable time function of the voltage that is the same for all phases of the output voltage.
    [2]
    2. A method according to claim 1, characterized in that the additional adjustable voltage function has the form. w-i VJ i-TKi ,, ,,, 3 - load load; 5 0 | 1 "AC1 - adjustable time function of the voltage on the individual phase loads, which has the greatest instantaneous value at the moment; - an adjustable temporal function of the voltage on the individual phase loads, which has the minimum instantaneous value at the moment.
    [3]
    3. The method according to claim 1, characterized in that the additional regulated temporal voltage function has the form "Wa siQjn S ak1t- 5 d, de S n l |" acC1 - adjustable time function of the voltage on individual phase loads, which has absolutely maximum value at the moment; 8 - defines the sign of the adjustable time voltage function; M is the maximum value of the modulated voltage, which is determined by adjacent pulses.
    [4]
    4. The method according to claim 1, characterized in that the additional regulated time function of the voltage has the form. (S (t) ... L1Ms11Cs W gg (tl-M-S "allb HHl Il.bJL ia, w (1 | IL c1i | 5, - adjustable time functions, for example, on individual phase loads that have the greatest or the smallest instantaneous values at the moment, respectively.
    Н0WWl
    BW / g 6.8
    [5]
    5. The method according to claim 1, characterized in that the additional regulated temporary 4 voltage functions are cilt) siQj, (11meis | M- 5, / 1, Where | 5 d | 1miless | - time function of the voltage is adjustable on phase loads, which has a doubled absolute value in a given MS:: aMeiKc | - determines the sign of the adjustable temporal voltage function. Sources of information taken into account in the examination 1.US Patent No. 3648150, CL 307- 88.3, published 1972. 2. US patent No. 3710229, CL 30788, published 1973.
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    引用文献:
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    AT232134B|1962-02-12|1964-03-10|Asea Ab|Control arrangement for converter|
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    DE2345035C2|1973-09-06|1975-10-23|Siemens Ag, 1000 Berlin Und 8000 Muenchen|Method and arrangement for controlling or regulating the speed of a converter-fed three-phase induction machine|
    US3886431A|1973-12-06|1975-05-27|Reliance Electric Co|Synchronizing circuit having an infinite number of ratios|JPS6143952B2|1979-07-28|1986-09-30|Toshiba Machine Co Ltd|
    DE2945145C2|1979-11-06|1988-12-29|Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt, De|
    US4458194A|1981-11-04|1984-07-03|Eaton Corporation|Method and apparatus for pulse width modulation control of an AC induction motor|
    US4656572A|1985-02-19|1987-04-07|Westinghouse Electric Corp.|PWM inverter|
    US4642748A|1985-08-29|1987-02-10|Mai Basic Four, Inc.|Monitoring switch mode converter performance utilizing duty cycle|
    US5168437A|1990-11-13|1992-12-01|Westinghouse Electric Corp.|Phase displaced, multiple inverter bridge circuits with waveform notching for harmonic elimination|
    JP3236983B2|1995-04-17|2001-12-10|株式会社日立製作所|Power converter|
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    US20090058330A1|2007-08-30|2009-03-05|Seagate Technology Llc|Driving a multi-phased motor|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    CS7600004319A|CS185455B1|1976-06-30|1976-06-30|Method of puls width modulation|
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