EPE Association: EPE 1989 - 38 - Dialogue Session 2.5: SWITCHED MODE POWER SUPPLIES: CONTROL, MODELLING, HIGH FREQUENCY CONVERTERS

EPE 1989 - 38 - Dialogue Session 2.5: SWITCHED MODE POWER SUPPLIES: CONTROL, MODELLING, HIGH FREQUENCY CONVERTERS
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1989 - Conference > EPE 1989 - 38 - Dialogue Session 2.5: SWITCHED MODE POWER SUPPLIES: CONTROL, MODELLING, HIGH FREQUENCY CONVERTERS

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   CONTROL PROBLEMS IN THE DOUBLE BOOST CONVERTER
By A. J. Forsyth [View]
[Download]

Abstract: The problem is addressed of designing a controller to regulate both outputs of a double boost converter. The application of current programmed control is examined and is shown both analytically and practically to introduce a dependency of duty-ratio on switching period, and therefore the design of the two control loops may not be carried out independently. A small signal model is developed and confirmed experimentally for the double boost converter with current programmed control.

   SINGLE-ENDED 1 MHZ QUASI-RESONANT HIGH-FREQUENCY INVERTER USING NEWLY-DEVELOPED STATIC INDUCTION TRANSISTOR
By H. Ogiwara; M. Nakaoka [View]
[Download]

Abstract: This paper describes a quasi-voltage resonance type high frequency inverter operating at 1 MHz zero-voltage switching (ZVS) using the specially designed HIGH-FREQUENCY Static Induction Transistor (HF-SIT) developed recently. The quasi-resonant inverter topology is theoretically expected to minimize the switching losses and stresses of a single switching power device (HF-SIT). However, this switching mode inverter inherently includes the major disadvantage that the peak voltage responsibility across the switching device becomes extremely severe. In order to overcome the disadvantage, a quasi-resonant ZVS topology using two cascaded HF-SITs is demonstrated. Thereby high output power could be obtained by this circuit construction. The trially-produced quasi-resonant ZVS inverter with current-regenerative type is presented and discussed on the hardware technology on 1 MHz power supply for induction-heating of metal rods and pieces. This simple inverter with high frequency link is found to work safely and stable in the frequency range of several MHz. The breadboard with sufficiently high power conversion efficiency is proved experimentally.

   CONVERTER MODELING USING RESONANT SWITCHES
By J. P. Ferrieux; E. Laveuve; J. Roudet [View]
[Download]

Abstract: This paper describes the dynamic modeling of DC-to-DC converters using resonant switches. The corresponding transfer functions are comparable with those of classical converters. Moreover, the output voltage behaviour for large step variations of load or frequency can be predicted by solving the differential equation. The theoretical results have been validated on a 25 W prototype. The experiment and simulation results obtain with the CIRCUIT and SCAMP programs are in good agreement. Thanks to these results, it will be possible in a next step to optimize the output voltage control system.

   A MODULAR AND VERSATILE CONTROL METHOD FOR PHASE-STAGGERING MULTIPLE POWER CONVERTERS
By H. Huisman; B. Gravendeel [View]
[Download]

Abstract: Operating several power electronics modules in parallel can have distinct advantages compared to a system which consists of only one module for the same total power rating. Some of these advantages are:
- higher effective inverter frequency
- inherent redundancy
- lower distortion of input and output waveforms.
These advantages can only be realized in practice when a control system takes care of the correct phase-shifting over 360/n degrees of the pulse pattern of the individual modules. A control method is presented whose philosophy allows any number of power modules to be operated in this manner, even under transient conditions.

   EDDY CURRENT LOSSES AND HIGH FREQUENCY MODELLING OF SWITCHING POWER SUPPLY TRANSFORMER
By J. P. Keradec; R. Feuillet; J. Perard [View]
[Download]

Abstract: This paper describes a local constants model elaboration for a transformer in a forward type switching power supply. This model is experimentally established in the range of 10 Hz-3 MHz and then physically justified. It is suitable to work with circuit simulation software. It appears that three components of this equivalent scheme enable us to describe correctly eddy currents effects in conduction. In another way, this relation can help investigators to experimentaly evaluate these effects.

   DC ANALYSIS OF THE PARALLEL RESONANT CONVERTER
By M. Rico; J. Sebastián; M. A. Pérez; J. Uceda [View]
[Download]

Abstract: A new vision to model resonant converter has been proposed. In this paper we present the mathematical method employed. The parallel resonant converter is analized and interesting conclusions have been obtained. Finally, theoretical results are compared with those obtained from the experiments carried out on a prototype.

EPE 1989 - 38 - Dialogue Session 2.5: SWITCHED MODE POWER SUPPLIES: CONTROL, MODELLING, HIGH FREQUENCY CONVERTERS
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1989 - Conference > EPE 1989 - 38 - Dialogue Session 2.5: SWITCHED MODE POWER SUPPLIES: CONTROL, MODELLING, HIGH FREQUENCY CONVERTERS
	[return to parent folder]

	CONTROL PROBLEMS IN THE DOUBLE BOOST CONVERTER By A. J. Forsyth	[View] [Download]
Abstract: The problem is addressed of designing a controller to regulate both outputs of a double boost converter. The application of current programmed control is examined and is shown both analytically and practically to introduce a dependency of duty-ratio on switching period, and therefore the design of the two control loops may not be carried out independently. A small signal model is developed and confirmed experimentally for the double boost converter with current programmed control.

	SINGLE-ENDED 1 MHZ QUASI-RESONANT HIGH-FREQUENCY INVERTER USING NEWLY-DEVELOPED STATIC INDUCTION TRANSISTOR By H. Ogiwara; M. Nakaoka	[View] [Download]
Abstract: This paper describes a quasi-voltage resonance type high frequency inverter operating at 1 MHz zero-voltage switching (ZVS) using the specially designed HIGH-FREQUENCY Static Induction Transistor (HF-SIT) developed recently. The quasi-resonant inverter topology is theoretically expected to minimize the switching losses and stresses of a single switching power device (HF-SIT). However, this switching mode inverter inherently includes the major disadvantage that the peak voltage responsibility across the switching device becomes extremely severe. In order to overcome the disadvantage, a quasi-resonant ZVS topology using two cascaded HF-SITs is demonstrated. Thereby high output power could be obtained by this circuit construction. The trially-produced quasi-resonant ZVS inverter with current-regenerative type is presented and discussed on the hardware technology on 1 MHz power supply for induction-heating of metal rods and pieces. This simple inverter with high frequency link is found to work safely and stable in the frequency range of several MHz. The breadboard with sufficiently high power conversion efficiency is proved experimentally.

	CONVERTER MODELING USING RESONANT SWITCHES By J. P. Ferrieux; E. Laveuve; J. Roudet	[View] [Download]
Abstract: This paper describes the dynamic modeling of DC-to-DC converters using resonant switches. The corresponding transfer functions are comparable with those of classical converters. Moreover, the output voltage behaviour for large step variations of load or frequency can be predicted by solving the differential equation. The theoretical results have been validated on a 25 W prototype. The experiment and simulation results obtain with the CIRCUIT and SCAMP programs are in good agreement. Thanks to these results, it will be possible in a next step to optimize the output voltage control system.

	A MODULAR AND VERSATILE CONTROL METHOD FOR PHASE-STAGGERING MULTIPLE POWER CONVERTERS By H. Huisman; B. Gravendeel	[View] [Download]
Abstract: Operating several power electronics modules in parallel can have distinct advantages compared to a system which consists of only one module for the same total power rating. Some of these advantages are: - higher effective inverter frequency - inherent redundancy - lower distortion of input and output waveforms. These advantages can only be realized in practice when a control system takes care of the correct phase-shifting over 360/n degrees of the pulse pattern of the individual modules. A control method is presented whose philosophy allows any number of power modules to be operated in this manner, even under transient conditions.

	EDDY CURRENT LOSSES AND HIGH FREQUENCY MODELLING OF SWITCHING POWER SUPPLY TRANSFORMER By J. P. Keradec; R. Feuillet; J. Perard	[View] [Download]
Abstract: This paper describes a local constants model elaboration for a transformer in a forward type switching power supply. This model is experimentally established in the range of 10 Hz-3 MHz and then physically justified. It is suitable to work with circuit simulation software. It appears that three components of this equivalent scheme enable us to describe correctly eddy currents effects in conduction. In another way, this relation can help investigators to experimentaly evaluate these effects.

	DC ANALYSIS OF THE PARALLEL RESONANT CONVERTER By M. Rico; J. Sebastián; M. A. Pérez; J. Uceda	[View] [Download]
Abstract: A new vision to model resonant converter has been proposed. In this paper we present the mathematical method employed. The parallel resonant converter is analized and interesting conclusions have been obtained. Finally, theoretical results are compared with those obtained from the experiments carried out on a prototype.