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This paper presents an improved indirect feedback instrumentation amplifier for reading ECG signals. The circuit uses a charge pump module and an integral feedback offset suppression module. The input common mode range (ICMR) is extended, and the electrode offset and baseline drift in the ECG signal are suppressed. The circuit is designed by using 0.18μm CMOS process. The simulation shows that the...
The quasi-Z-source inverter (QZSI) has been presented suitable for solar photovoltaic applications mainly because of its one stage buck/boost capability and improved reliability. Carefully designed closed-loop control strategy is usually demanded by QZSI in photovoltaic applications for voltage boost, grid-connection and the maximum power point tracking (MPPT). Cascaded QZSI as to further step up...
Double line frequency ripple (2ω ripple) power inherently exists in single phase dc-ac or ac-dc pulse width modulation converters because of instantaneous power unbalance between the dc and ac side. In order to achieve stable operation and maintain a high maximum power point tracking (MPPT) efficiency, traditional single-phase quasi-Z-source inverter (QZSI) for photovoltaic application uses large...
Inductor-less, high gain DC-DC converter with high efficiency and high power density is a much desired circuit in Electric Vehicle (EV) powertrain and Solar photovoltaic (SPV) power converters. Modular Multi-level capacitor clamped DC-DC converter circuits (MLCCC) provide a viable solution for this case. But, their application is limited owing to their limitations in terms of fixed output voltage...
Compared to the central inverter utilized in PV power generation system, modularized dc-ac converter becomes more and more popular. Dealing with hundreds of watts of energy, these micro-Photovoltaic (PV) inverters convert solar energy of each PV panel to the utility individually, with significant improvement of overall system reliability. This paper presents a case study of a single-phase micro- PV...
This paper presents high performance control algorithms for a 100 kVA three-phase four-wire online voltage regulator. The 100 kVA voltage regulator is composed of a PWM rectifier, a center-tapped DC bus, and an inverter. The rectifier connects with the grid through an LCL filter, providing power factor correction and DC-link voltage regulation. The inverter output power is fed forward to the rectifier...
The voltage-fed quasi-Z-source inverter (qZSI) has been presented advantageous for photovoltaic (PV) applications. This paper further develops the closed-loop controller for the qZSI operating in both stand-alone and grid-connected modes. Regarding to the limitation between the modulation index and shoot-through duty ratio, guideline of the reference selection for capacitor voltage to minimize the...
This paper presents a quasi-Z-source inverter (qZSI) that is a new topology derived from the traditional Z-source inverter (ZSI). The qZSI inherits all the advantages of the ZSI, which can realize buck/boost, inversion and power conditioning in a single stage with improved reliability. In addition, the proposed qZSI has the unique advantages of lower component ratings and constant dc current from...
This paper presents two 3-pole tunable bandpass coplanar filters that include BST ferroelectric capacitors, tunable from 28 GHz up to 37 GHz. Both filters consist of cascaded coplanar transmission resonators, loaded with high-quality factor discrete BST capacitors. The first design includes 6 capacitors and the second one is loaded with 12 capacitors. The capacitance is varied from 60 fF up to 20...
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