EPE Association: EPE 2005 - Topic 03-3 - LS: Power converter circuits and control

EPE 2005 - Topic 03-3 - LS: Power converter circuits and control
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2005 - Conference > EPE 2005 - Topic 03: SOFT SWITCHING CONVERTERS AND CONTROL > EPE 2005 - Topic 03-3 - LS: Power converter circuits and control

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   Dynamic Behaviour of PI Controlled Class-E Resonant Converter for Step-Down Applications Using Piezoelectric Transformers (PT)
By RIEDLHAMMER Anton; VAZQUEZ CARAZO Alfredo; RADECKER Matthias; KNOLL Alois; BISOGNO Fabio; NITTAYARUMPHONG Sadachai [View]
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Abstract: The target of a power converter controller using a Piezoelectric Transformer (PT) designed as a resonant circuit, as in half-bridge or Class-E topology [1] [2] is to maintain constant output voltage or current and to achieve the ZVS (Zero-Voltage-Switching) condition over the operation range. In the presented Class-E application, the design of the closed-loop feedback is achieved for 0-3 Watts at 6 V/DC output with a varied output load between 12 -1.2 k, at input voltage range of 85-260 V/AC using different PT samples, at switching frequency range of 145 to 180 kHz, with the concept of PI control. The transient responses of the controller are presented with the jump of load and input voltage. In addition, the transfer function of Class-E from original 4th order transfer function is linearized to be 1st order linear function as a function of the output current from the switching frequency and the varied input voltage. The Laplace transformation of the Class-E converter with feed back PI control is analyzed using a linear model method. The stability condition of the closed loop control is analyzed with the Routh-Hurwitz stability criterion method.

   EKF-based output-voltage regulation of 3rd-order LCC resonant converters subject to load variations
By FOSTER Martin; BINGHAM Chris; GILBERT Adam; STONE Dave; BHANGU Bikramjit [View]
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Abstract: The Extended Kalman Filter (EKF) is proposed as a candidate methodology to eliminate the requirement for isolated feedback sensors (components that contribute to complexity, component count and cost), for the closed-loop regulation of 3rd-order LCC resonant power supplies. Unlike previously reported methodologies it is shown that the proposed formulation accommodates the effects of output load variations and enhanced disturbance rejection using a feedforward control scheme.

   Resonant Standby Mode for LLCC Load Resonant Power Converters
By HENTE Dirk; DEPPE Carsten; BOEKE Ulrich [View]
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Abstract: A solution for efficient small volume power supplies is the use of high switching frequencies combined with Zero Voltage Switching (ZVS). One topology for this is the LLCC converter. Cost effective solutions for many applications require the implementation of integrated standby operation. Standby operation here means the maintenance of basic control functions while the rest of the device is turned off. This article shows a new approach for this function without additional active components.

EPE 2005 - Topic 03-3 - LS: Power converter circuits and control
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2005 - Conference > EPE 2005 - Topic 03: SOFT SWITCHING CONVERTERS AND CONTROL > EPE 2005 - Topic 03-3 - LS: Power converter circuits and control
	[return to parent folder]

	Dynamic Behaviour of PI Controlled Class-E Resonant Converter for Step-Down Applications Using Piezoelectric Transformers (PT) By RIEDLHAMMER Anton; VAZQUEZ CARAZO Alfredo; RADECKER Matthias; KNOLL Alois; BISOGNO Fabio; NITTAYARUMPHONG Sadachai	[View] [Download]
Abstract: The target of a power converter controller using a Piezoelectric Transformer (PT) designed as a resonant circuit, as in half-bridge or Class-E topology [1] [2] is to maintain constant output voltage or current and to achieve the ZVS (Zero-Voltage-Switching) condition over the operation range. In the presented Class-E application, the design of the closed-loop feedback is achieved for 0-3 Watts at 6 V/DC output with a varied output load between 12 -1.2 k, at input voltage range of 85-260 V/AC using different PT samples, at switching frequency range of 145 to 180 kHz, with the concept of PI control. The transient responses of the controller are presented with the jump of load and input voltage. In addition, the transfer function of Class-E from original 4th order transfer function is linearized to be 1st order linear function as a function of the output current from the switching frequency and the varied input voltage. The Laplace transformation of the Class-E converter with feed back PI control is analyzed using a linear model method. The stability condition of the closed loop control is analyzed with the Routh-Hurwitz stability criterion method.

	EKF-based output-voltage regulation of 3rd-order LCC resonant converters subject to load variations By FOSTER Martin; BINGHAM Chris; GILBERT Adam; STONE Dave; BHANGU Bikramjit	[View] [Download]
Abstract: The Extended Kalman Filter (EKF) is proposed as a candidate methodology to eliminate the requirement for isolated feedback sensors (components that contribute to complexity, component count and cost), for the closed-loop regulation of 3rd-order LCC resonant power supplies. Unlike previously reported methodologies it is shown that the proposed formulation accommodates the effects of output load variations and enhanced disturbance rejection using a feedforward control scheme.

	Resonant Standby Mode for LLCC Load Resonant Power Converters By HENTE Dirk; DEPPE Carsten; BOEKE Ulrich	[View] [Download]
Abstract: A solution for efficient small volume power supplies is the use of high switching frequencies combined with Zero Voltage Switching (ZVS). One topology for this is the LLCC converter. Cost effective solutions for many applications require the implementation of integrated standby operation. Standby operation here means the maintenance of basic control functions while the rest of the device is turned off. This article shows a new approach for this function without additional active components.