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A 150W opamp

1985 IEEE International Solid-State Circuits Conference. Digest of Technical Papers, 1985

A ±35V, ±10A opamp incorporating a class B output stage to avoid quasi- complementary problems will be discussed. Continous dissipation rating of 90W and a peak rating of 800W has been achieved.


Multi-Level Current Reinjection CSC for STATCOM Application

2006 International Conference on Power System Technology, 2006

A multi-level current reinjection concept, already shown to provide acceptable harmonic reduction with fewer switching components than the conventional multi-level schemes, is described in this paper with reference to its performance when operated as a STATCOM. PSCAD/EMTDC is used to illustrate the steady state and fast dynamic response to system changes, both under symmetrical and asymmetrical terminal voltage conditions.


New power modulator for high voltage accelerators

2014 IEEE International Power Modulator and High Voltage Conference (IPMHVC), 2014

New power modulator with less stray capacitance is proposed for HVDC accelerators which are used as actuators of tokamak fusion device, such as EAST (Experimental Advanced Superconducting Tokamak), ITER or CFTER (China fusion engineering test reactor). It is implemented with high frequency insulation transformer for powering loads of the accelerator floating on its high voltage pole, such as its extraction ...


Comparative evaluation of IGCT and GTO thyristor for series connection in high power voltage source inverter based FACTS applications

2007 European Conference on Power Electronics and Applications, 2007

In this paper, comparative evaluation between 4.5 kV, 4 kA GTO thyristor and IGCT for series connection in high power three-level Neutral Point Clamped (NPC) voltage source inverter applications is reported. Turn-off tests for GTO and IGCT are compared with RCD snubber at high dc voltage and current. Small RC snubber design is optimized and series connection issues for IGCT ...


Study on optimum design procedure of charger based on full-bridge phase-shifted ZVZCS converter

2008 IEEE Vehicle Power and Propulsion Conference, 2008

An optimum design procedure of an Electric Vehicle charger based on a full- bridge phase-shifted zero-voltage and zero-current switching (FB-PS-ZVZCS) dc- dc converter is proposed. The converter uses a small capacitor and two small diodes to form the clamp circuit, which makes the converter simple and easy to control. According to the analysis of the operation principles, several conclusions about ...


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  • A 150W opamp

    A ±35V, ±10A opamp incorporating a class B output stage to avoid quasi- complementary problems will be discussed. Continous dissipation rating of 90W and a peak rating of 800W has been achieved.

  • Multi-Level Current Reinjection CSC for STATCOM Application

    A multi-level current reinjection concept, already shown to provide acceptable harmonic reduction with fewer switching components than the conventional multi-level schemes, is described in this paper with reference to its performance when operated as a STATCOM. PSCAD/EMTDC is used to illustrate the steady state and fast dynamic response to system changes, both under symmetrical and asymmetrical terminal voltage conditions.

  • New power modulator for high voltage accelerators

    New power modulator with less stray capacitance is proposed for HVDC accelerators which are used as actuators of tokamak fusion device, such as EAST (Experimental Advanced Superconducting Tokamak), ITER or CFTER (China fusion engineering test reactor). It is implemented with high frequency insulation transformer for powering loads of the accelerator floating on its high voltage pole, such as its extraction grid, plasma grid, RF system, bias plate and snubbers for fast-fault-protection (FFP). It facilitates its FFP design to satisfy IEC EMC standards implemented by ITER or ITER-like CFETR. Based on our former work [Ge Li et al., "Compact Power Suppliers for Tokamak Heating.", IEEE Trans. on DEI, Vol. 19, No. 1 (2012)], a 3 kA power module is designed for powering the plasma grid, as might be configured a new roadmap with less stray capacitance for reliable engineering design of HVDC accelerators in CFETR.

  • Comparative evaluation of IGCT and GTO thyristor for series connection in high power voltage source inverter based FACTS applications

    In this paper, comparative evaluation between 4.5 kV, 4 kA GTO thyristor and IGCT for series connection in high power three-level Neutral Point Clamped (NPC) voltage source inverter applications is reported. Turn-off tests for GTO and IGCT are compared with RCD snubber at high dc voltage and current. Small RC snubber design is optimized and series connection issues for IGCT are addressed. Experimental results are compared for a two three-level NPC inverter poles operated as H-bridge with three series connected 4.5 kV, 4 kA GTO Thyristors and IGCTsper switch.

  • Study on optimum design procedure of charger based on full-bridge phase-shifted ZVZCS converter

    An optimum design procedure of an Electric Vehicle charger based on a full- bridge phase-shifted zero-voltage and zero-current switching (FB-PS-ZVZCS) dc- dc converter is proposed. The converter uses a small capacitor and two small diodes to form the clamp circuit, which makes the converter simple and easy to control. According to the analysis of the operation principles, several conclusions about the influences of the converterpsilas main parameters to the operating characteristics and the restrictions between parameters are drawn. Based on the conclusions, a parameter optimum design procedure is proposed. The proposed procedure can be used to design the values of the switches snubber capacitor, the clamp capacitor, the transformerpsilas turns ratio and the maximum duty cycle, etc. By using the proposed procedure, a converter prototype is designed. The prototype is simulated in Matlab/Simulink and verified by experiments. The simulation and experiment results validated the parameters as well as the proposed optimum design procedure.

  • A new ZCS PWM full-bridge converter of buck-type for applications with very high input voltage

    For applications requiring power conversion from an input voltage of several kilovolts, like power supplies in railway systems, a new soft-switching PWM full-bridge converter of buck type is proposed. The active snubber used in this purpose is formed by two transistors operated alternatively in each half- cycle and one resonant capacitor, and is inserted in the secondary-side. All the main primary-side switches are turned-on and -off with ZCS, making them suitable for an IGBT implementation. The snubber's transistors are also turned-on and -off with ZCS. The resonant energy used to get soft-switching is recycled in each cycle to the load, by enhancing thus the effective duty- ratio. No additional resonant inductor is used, the transformer leakage inductance forms the resonant circuit with the snubber's capacitor. The soft- switching realization is independent of the load. The resonant capacitor is designed such that to assure ZCS starting from the required minimal input voltage. A design-oriented steady-state analysis leads to the expressions of the dc voltage conversion ratio and ZCS analytical conditions, allowing for a trade-off design of the resonant capacitance. The simulation and experimental results confirm the detailed theoretical analysis.

  • AC/DC converter with indirect matrix converter using a novel snubber configuration

    This paper proposes AC/DC converter with high frequency isolation. The proposed converter employs an indirect matrix converter (IMC) to convert three phase AC to high frequency AC using a novel snubber configuration and control suitable for implementation using 6-in-1 module. In an IMC, a snubber circuit is required instead of electrolyte capacitor in order to absorb energy of leakage inductor of transformers. In addition, both input and output have to be controlled simultaneously. In this paper, a novel snubber configuration is proposed suitable for implementation with 6-in-1 module. Control scheme for the proposed circuit is also explained in order to realize reliable and high efficient converter.

  • Single-phase quasi-Z-source AC-AC converter with safe-commutation strategy

    Single-phase quasi-Z-source AC-AC converter has a lower input current total harmonic distortion, higher input power factor and higher efficiency in comparison with the conventional single-phase Z-source AC-AC converter. This paper presents a safe-commutation strategy for the single-phase quasi-Z-source AC-AC converter. The converter only uses four switches without the use of a snubber circuit. The operating principle and steady-state analysis are presented. The experimental results show that the use of safe-commutation strategy is a significant improvement as it makes it possible to avoid voltage spikes on the switches.

  • A family of turn-on and turn-off nondissipative passive snubbers for soft-switching single-phase rectifier with reduced conduction losses

    This paper presents a family of nondissipative passive snubbers applied to the single-phase rectifier with reduced conduction losses, for applications in power supply for telecommunication and UPS. The family of lossless passive snubbers presented in this paper guarantees soft-commutation during the turn- on and the turn-off intervals of the switch. The snubber not only should slow the di/dt and dv/dt rates of the active switch, but also losslessly recover the energy stored in the zero-current inductor and in the zero-voltage capacitor, leading to reduced voltage stress across the switch and diodes. A methodology to generate the family of passive snubbers for the single-phase rectifier with reduced conduction losses is also presented. Simulation and experimental results for a single-phase rectifier 3000 W laboratory prototype using one snubber of the family are also presented.

  • A Comparative Study of Two Passive Regenerative Snubbers for Flyback Converters

    Flyback Converters are widely used in many applications because of their simplicity. They can be implemented by using active or passive snubbers. Passive snubbers considered to be cheaper but less efficient. The recent development of regenerative energy passive snubbers has resulted in more efficient passive snubbers. Two different passive regenerative energy snubbers are examined in this paper - a previously proposed snubber and a variation of this snubber that has been modified by the authors. In this paper, the operation of the two converters is explained and experimental results and efficiency curves obtained from prototype converters are then presented. Based on the efficiency curves, conclusions are made about the relative efficiency of the two snubbers.



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