Leakage Inductance Of Coupled Inductor Research Articles

A Quintupler Boost High Conversion Gain Soft-Switched Converter for DC Microgrid

This study proposes a high conversion gain soft-switching quintupler boost non-isolated converter for DC microgrid. By inclusion of quintupler rectifier and coupled inductor with reduced duty cycle, high voltage gain is obtained. The leakage energy of coupled inductor is recycled through an auxiliary switch and the output capacitor improves further boost. Due to the active clamp and this recycled leakage energy, huge inductive voltage spikes across MOSFETs are alleviated and also, stress is reduced. Hence, low voltage rating (low <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$R_{ds(ON)}$ </tex-math></inline-formula> ) switches can be utilized and minimize conduction losses. In addition, this clamp enables zero-voltage switching (ZVS) for both the MOSFETs, even at light loads. Quintupler multiplier rectifier reduces the voltage stress across diodes. This, in turn, reduces reverse recovery losses for multiplier diodes. Further, the coupled inductor leakage inductance in series with diodes provides for the snubbing effect to alleviate voltage spikes across quintupler diodes. Thus, the overall diode voltage rating reduces. This improves power density and improves the overall efficiency of the converter. Finally, a 400W prototype operates at 100kHz is developed to validate the converter performance. The measured peak efficiency is 96.43%.

New Semiquadratic High Step-Up DC/DC Converter for Renewable Energy Applications

In this article, a new semiquadratic high step-up coupled-inductor dc/dc converter (SQHSUCI) with continuous input current and low voltage stress on semiconductor components is presented. The proposed structure employs a coupled-inductor (CI) and two power switches with simultaneous operation to achieve an extremely high voltage conversion ratio in a semiquadratic form. The voltage stress across the main power switch is clamped by two regenerative clamp capacitors. Here, the switching losses of both MOSFET s have been reduced by applying quasi-resonance operation of the circuit created by the leakage inductance of the CI along with the balancing and clamp capacitors. Therefore, by considering the high gain conversion ratio along with low voltage stress on components, the magnetic and semiconductors losses of the SQHSUCI are reduced significantly. Also, the energy stored in the leakage inductance of CI is recycled to the output capacitor. These features make the proposed SQHSUCI more suitable for industrial applications. The operation principle, steady state, and also comparisons with other related converters in continuous conduction mode (CCM) are discussed in detail. Finally, experimental results of a prototype with 20 V input and 200 W–200 V output at 50 kHz switching frequency, verify the theoretical advantages of the proposed strategy.

A novel PV based high voltage gain soft switching DC-DC boost converter

The design of high voltage gain DC-DC boost converter is carried out with the addition of the Voltage Multiplier (VM) method. Here the coupled inductor and VM methodologies are proposed to reduce the switching and conduction losses of the Metal Oxide Semiconductor Field Effect Transistor (MOSFET). The Zero Current Switching (ZCS) technique with coupled inductor leakage inductance is used to operate the MOSFET. The leakage inductance is used to decrease the reverse recovery current across the diode. The design procedure of the boost converter and corresponding output waveforms are presented in this paper. Photovoltaic (PV) source converter with coupling inductors soft switching technique has been analyzed and tested in this paper.

Isolated Coupled-Inductor-Integrated DC–DC Converter With Nondissipative Snubber for Solar Energy Applications

This paper proposes an isolated coupled-inductor-integrated dc–dc converter with a nondissipative snubber for solar energy applications. The proposed converter realizes high step-up voltage gain without incurring a high coupled inductor turns ratio by adapting a dual-voltage doubler circuit. In addition, the energy in the coupled inductor leakage inductance can be recycled via a nondissipative snubber on the primary side. Thus, the system efficiency is improved. Finally, a laboratory prototype for demonstrating the performance of the proposed circuit is implemented with a 200-W solar array simulator, a 24-V solar voltage, and a 200-V output voltage. The experimental results show that the peak efficiency of the proposed converter is about 96%.

An isolated ZVS/ZCS flyback converter using the leakage inductance of the coupled inductor

This paper describes a simple and effective way to modify an existing hard-switched flyback power converter into a circuit with zero-voltage switching (ZVS) and zero-current switching (ZCS). The key improvement is to turn the unattractive features of the coupled inductor leakage inductance and snubber capacitor into attractive ones. The coupled inductor leakage inductance and snubber are used to form a quasi-resonant circuit to facilitate ZVS/ZCS of all power devices. The operating principles of the power converter and experimental results are presented.