Scheduled System Maintenance:
Some services will be unavailable Sunday, March 29th through Monday, March 30th. We apologize for the inconvenience.
By Topic

Power Electronics, IEEE Transactions on

Issue 4 • Date Oct. 1990

Filter Results

Displaying Results 1 - 16 of 16
  • Comments, with reply, on "A new control philosophy for power electronic converters as fictitious power compensators" by J.H.R. Enslin and J.D. Van Wyk

    Publication Year: 1990 , Page(s): 503 - 504
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (212 KB)  

    In the above titled paper (see ibid., vol.5, no.1 p.88-97, Jan. 1990) the authors develop concepts they suggested in an earlier paper (see IEEE Trans. Instrum. Meas., vol.IM-37, no.3, p.403-8, Sept. 1988). In these two papers, they draw conclusions regarding definitions of power quantities for systems with nonsinusoidal waveforms. They also show how the quantities suggested can be measured and compensated. The commenter points out that although the authors correct errors pointed out by himself and by P.S. Filipski in comments on the earlier paper, they repeat certain misconceptions in their definitions and add new ones. The commenter identifies these misconceptions. The authors refute the points raised by the commenters.<> View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A 2.5-kW cascaded Schwarz converter for 20-kHz power distribution

    Publication Year: 1990 , Page(s): 381 - 388
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (588 KB)  

    The cascaded Schwarz converter, which provides a relatively simple method for driving 20 kHz power systems, is discussed. The cascaded Schwarz is compared with other 20 kHz converters, showing that the circuit is relatively easy to protect and provides a predictable trapezoidal voltage waveform. Because it avoids the high currents in a parallel loaded capacitor, the cascaded Schwarz should offer better component utilization than converters with sinusoidal output voltages. Operation has been verified on a 2.5 kW circuit that uses input and output voltages in the same range as those anticipated for certain future spacecraft power systems View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Single-stage current-fed DC-DC converter with time-sharing control of output voltage and input current

    Publication Year: 1990 , Page(s): 389 - 397
    Cited by:  Papers (7)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (720 KB)  

    A single-stage current-fed DC/DC power converter structure and control strategy for simultaneous control of output voltage and current flowing in the input inductor are described. This configuration is suitable for high power-density applications because it results in reduced converter size and power loss. A very fast control-to-output response is obtained, together with stable operation even for large load and reference variations. Static and dynamic converter performances are investigated and design criteria given. Experimental results obtained on a prototype are also reported View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Completely digital position feedback control for synchronous servodrives

    Publication Year: 1990 , Page(s): 495 - 502
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (496 KB)  

    A completely digital control concept for a synchronous servodrive is presented. The hardware consists of a pulsewidth-modulated (PWM) inverter and a microcontroller with peripheral components for state-value measurements and set-value output. The derivation of a mathematical model of the PM synchronous servodrive is shown. A cascaded state feedback controller (which consists of a position state feedback controller with an inner-current control loop) is introduced. Two different types of current controllers are compared View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A discrete approach to the modeling of power electronic switching networks

    Publication Year: 1990 , Page(s): 398 - 403
    Cited by:  Papers (18)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (492 KB)  

    An approach to time-domain analysis and modeling of power electronic circuits is described. All circuit components (including active and passive elements) are modeled in a discrete manner by transmission-line sections using the transmission-line modeling (TLM) method. This method requires a fixed system matrix which depends only upon the circuit configuration and time step and not on the switching states of the circuit. Since this method adopts a discrete approach, it provides an exact solution to the discrete model and is stable even for stiff networks. Errors are due to the modeling process only and not to the approximate solution of an approximate calculus model. A simulation on a switched-mode power supply is used to illustrate the modeling method, and the simulated results are compared with measurements View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Nonresonant and resonant coupled zero voltage switching converters

    Publication Year: 1990 , Page(s): 404 - 412
    Cited by:  Papers (7)  |  Patents (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (564 KB)  

    Two zero-voltage switching power converters with nonresonant and resonant coupling are presented. These are high-order multiple resonant converters in which the circuit modes associated with the converter operation may have different resonant frequencies. The steady-state responses of these converters are derived in terms of state-plane diagrams by using proper state variable transformations. It is shown that the converters have all the desirable features for high-frequency applications and overcome the drawback of load-range limitation of zero-voltage switching associated with the conventional class-E converter View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Switched reluctance drives: new aspects

    Publication Year: 1990 , Page(s): 454 - 458
    Cited by:  Papers (3)  |  Patents (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (304 KB)  

    A 1 kW switched reluctance motor drive and an efficient power converter requiring only a low number of switches are introduced. An analytical model of the interactive behavior of the motor and the power converter is developed. The drive is to be essentially torque controlled. The goodness factor of the motor (which expresses how effectively the voltamperes available from the power converter are used for active power conversion) is introduced. In order to increase the goodness factor, premagnetization is applied. The controllability of torque and the premagnetization principle is evaluated by experiments and are found to agree with the theoretical model View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A model reference adaptive PWM technique

    Publication Year: 1990 , Page(s): 485 - 494
    Cited by:  Papers (13)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (584 KB)  

    A model reference adaptive (MRA) pulsewidth-modulated (PWM) technique for invertor switching applications is presented and analyzed. With this technique, the near optimal inverter gating signals are determined through a closed-loop process which compares a reference signal to a feedback signal derived from a built-in reference model of the load. In addition to its simplicity of implementation, the proposed PWM technique has the advantages of inherent controlled constant volts-per-Hertz (V/f) ratio operation and jitter-free operation with free-running carrier. Such features are of importance in variable-speed AC-drive applications where V/f control increases the control-circuit complexity and where carrier frequency jumps cause harmful torque/speed transients View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A direct field-oriented controller for induction motor drives using tapped stator windings

    Publication Year: 1990 , Page(s): 446 - 453
    Cited by:  Papers (12)  |  Patents (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (560 KB)  

    The implementation of a direct method of field orientation that requires little knowledge of machine parameters and uses only readily measurable quantities is discussed. The system uses tapped stator windings to measure the air-gap flux. The signals from the tapped windings are also used in a flux-regulation loop. A speed controller is implemented using the ripples created in the tapped windings by the motion of the rotor slots through the flux for speed information View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Modeling of control loop behavior of magamp post regulators

    Publication Year: 1990 , Page(s): 476 - 484
    Cited by:  Papers (17)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (568 KB)  

    Small signal-control models are presented for a magnetic amplifier switching-mode post regulator for SMPS applications. Two commonly used current reset schemes are considered; an external reset scheme and a self-reset scheme. It is mathematically shown that the open-loop gain is a two-pole, single-zero transfer function for continuous-mode operation and is a single pole transfer function for discontinuous mode operation. The equations for predicting the open-loop gains for both types of reset circuits are derived and verified experimentally. It is shown that the open-loop gain characteristics of a magnetic-amplifier regulator depends on power circuit parameters, the reset-circuit parameters, and the saturable reactor parameters. Models for both continuous mode and discontinuous modes of operation that provide designers with useful tools for designing a compensation network for the feedback error amplifier are presented View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Field-oriented control of an induction machine in a high frequency link power system

    Publication Year: 1990 , Page(s): 436 - 445
    Cited by:  Papers (9)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (704 KB)  

    A field-oriented controlled induction machine drive operating with a high-frequency single-phase sinusoidal voltage link is presented. System performance is investigated by computer simulation and is verified by test on an actual prototype system. A control loop is proposed for minimizing the link-voltage fluctuation. The capability of rapid demagnetization of the induction machine by current regulation is investigated. A new current modulation technique called switch mode selection is proposed and its performance is compared with the conventional delta modulation technique View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A novel unipolar converter for switched reluctance motor

    Publication Year: 1990 , Page(s): 469 - 475
    Cited by:  Papers (7)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (520 KB)  

    A configuration of a unipolar power converter with improved switching performance suitable for switched-reluctance motor supply is presented. The switched-reluctance motor operation principle is presented and its ideal characteristics are considered. The proposed converter is described and its operation is analyzed. The converter characteristics are studied with the aid of computer simulation. Current control of the proposed converter is considered. A prototype converter has been built to verify the analysis results and to validate the simulation. The design procedure is presented and experimental results which confirm the analysis are given and discussed View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Electrical terminal representation of conductor loss in transformers

    Publication Year: 1990 , Page(s): 424 - 429
    Cited by:  Papers (32)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (488 KB)  

    The formulation of a general, complete electrical terminal representation of eddy-current loss in transformer windings is presented. It is shown that the effects of mutual resistances must be considered in addition to the familiar winding resistances (self resistances) for a complete description of eddy-current loss. A simple two-foil winding structure is analyzed to display the features of the self- and mutual-resistance terms. The example illustrates that leakage resistance, i.e. resistance associated with opposing winding currents of equal amp turns, provides only a partial description of eddy-current loss. The analysis is extended to multiple windings, with a simple three-foil winding structure as an example View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • An improved understanding for the transient operation of the power insulated gate bipolar transistor (IGBT)

    Publication Year: 1990 , Page(s): 459 - 468
    Cited by:  Papers (55)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (816 KB)  

    It is shown that a nonquasi-static analysis must be used to describe the transient current and voltage waveforms of the insulated gate bipolar transistor. The nonquasi-static analysis is necessary because the transport of electrons and holes are coupled for the low-gain, high-level injection conditions, and the quasi-neutral base width changes faster than the base transit speed for typical load circuit conditions. To verify that both of the nonquasi-static effects must be included, the predictions of the quasi-static and nonquasi-static models are compared with measured current- and voltage-switching waveforms. The comparisons are performed for different load circuit conditions and for different device base lifetimes View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 8000-V 1000-A gate turn-off thyristor with low on-state voltage and low switching loss

    Publication Year: 1990 , Page(s): 430 - 435
    Cited by:  Papers (7)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (596 KB)  

    An 8 kV, 1 kA gate turn-off thyristor (GTO) that has been designed with a combination of a p-i-n structure and a ringed-anode short structure is discussed. The GTO has been fabricated using a diffusion and epitaxial buffer process. As a consequence, low on-state voltage and low switching loss have been achieved, solving the two major problems in high-voltage GTOs. The device's structure, the p-i-n base process, and the electrical characteristics of the GTO are described View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A multiprocessor-based fully digital control architecture for permanent magnet synchronous motor drives

    Publication Year: 1990 , Page(s): 413 - 423
    Cited by:  Papers (14)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (792 KB)  

    The design and implementation of a multiprocessor-based fully digital control architecture for permanent-magnet synchronous motor drives and an approach for designing advanced AC servo drives using currently available high-performance microprocessors are presented. The design of the architecture involves formulation of control algorithms for a current-regulated pulsewidth-modulated inverter and advanced vector-control strategies for speed and position loop. Under the vector-control framework, some recently developed robustness control results are applied to the design of speed-loop controllers. The implementation of the architecture integrates the control of current, speed, and position loop using the multiprocessor-based controller. Experimental case studies that correlate simulation and measurement results are provided. Experiments were conducted to compare the controller performance, including step speed and position responses, closed-loop frequency responses, the effect of field-weakening control, and disturbance-rejection performance. The experimental results validate the theoretical development View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.

Aims & Scope

IEEE Transactions on Power Electronics covers fundamental technologies used in the control and conversion of electric power.

Full Aims & Scope