This paper presents a digital non-linear pulse-width modulation (PWM) controller in a high-voltage (HV) buck-boost DC-DC converter for the piezoelectric transducer of the down-hole acoustic telemetry system. The proposed design controls the generation of output signal with voltage higher than the supply voltage and is targeted to work under high temperature. To minimize the power consumption an...

This paper presents a simple control strategy for the operation of a variable speed stand-alone wind turbine with a permanent magnet synchronous generator (PMSG). The PMSG is connected to a three phase resistive load through a switch mode rectifier and a voltage source inverter. Control of the generator side converter is used to achieve maximum power extraction from the available wind power. Co...

AC-DC single-stage converters are attractive because of their simplicity. The conventional power electronics converters used for such application have two stages, a diode bridge rectifier at the front end followed by a dc-dc boost converter. However, the extremely low output voltage of electromagnetic microgenerator does not allow diode bridge rectification. Even if possible, the losses in the ...

Dc-deflections were recorded with the paraffin gap method from the terminal of isolated single.type spindles in the frog sartorius muscle during ramp-and-hold stimulation. The amplitude of the dc-deflection over 60/lV was independent of the rate of afferent discharge and was little changed after inactivation of the axon terminal by irradiation with an ultraviolet light. The amplitude and the po...

This paper proposes a small wind energy conversion system comprises permanent magnet synchronous generator (PMSG), uncontrolled rectifier, conventional H-Bridge inverter and dc-dc bi-directional converter. The dc link capacitor is connected to a storage system through Bi-directional power flow link. A hybrid pulse width modulation (HPWM) controller is used to regulate the ac load voltage and fr...

A hybrid renewable energy system is described which consists of twelve photovoltaic (PV) panels and a wind generator and can supply continuous electric power of 1.5 kW. An Energy Management System (EMS) was developed for this purpose in order to maximize the electric power produced using a maximum power point tracking (MPPT) method and consists of Buck-type DC/DC converters controlled by a micr...

Although brush type DC machinery has lost market share over the years to its brushless counterparts, it still maintains a significant presence in the automotive, aerospace, power tool, and home appliance industries. Especially in automotive and aerospace power system applications, early detection of brush type DC machine faults will help to avoid problematic system failures, decrease maintenanc...