DC Voltage Reference Based on a Square-Wave-Actuated Microelectromechanical Sensor

2011 ◽  
Vol 60 (7) ◽  
pp. 2506-2511 ◽  
Author(s):  
Jussi Kaasalainen ◽  
Antti Manninen
Keyword(s):  
Voltage Reference ◽  
Dc Voltage ◽  
Square Wave

Development of a Microcontroller-Based 6/12/18/24V Power Inverter Circuit

2017 ◽  
Vol 10 ◽  
pp. 19
Author(s):  
Abiodun Ogunseye ◽  
Daniel Ogheneovo Johnson
Keyword(s):  
Tolerance Limits ◽  
C Language ◽  
Dc Voltage ◽  
Square Wave ◽  
Design Specifications ◽  
Development Tool ◽  
Nominal Voltage ◽  
Single Input ◽  
Inverter Circuit

A power inverter circuits is normally designed to meet its design specifications when the applied input DC voltage is within specified tolerance limits. Thus, single input inverters are usually specified to work from a DC source having a fixed nominal voltage. This limits the usefulness of the inverter circuit when a DC source having the specified nominal voltage is not available. In this work, a modified square wave inverter system that is specified to work properly from batteries with nominal voltages of 6, 12, 18 and 24 V was designed.  A model of the microcontroller-based circuit was developed with Proteus® software and its firmware was written in C language using the MicroC® development tool. A prototype of the circuit was constructed and then tested.  The constructed circuit was found to work properly by producing a 50 Hz modified square waveform when it was powered from batteries having nominal voltages of 6 V, 12 V, 18 V and 24 V.

The Research of SVPWM Control of Shunt Active Power Filter Based on the Inner Relationship between Current and Voltage

2014 ◽  
Vol 528 ◽  
pp. 201-209 ◽  
Author(s):  
Meng Hua Zhang ◽  
Xin Gong Cheng ◽  
Xi Ju Zong
Keyword(s):  
Control Strategy ◽  
Compensation Effect ◽  
Active Power Filter ◽  
Active Power ◽  
Voltage Reference ◽  
Shunt Active Power Filter ◽  
Harmonic Compensation ◽  
Dc Voltage ◽  
Power Filter ◽  
Low Efficiency

To achieve the goal of decreasing the harmonic level in the power grid, traditional shunt active power filter uses the methods such as triangular wave comparison and hysteresis comparator which overall exist some problems, for instance, poor ability of current tracking and low efficiency of DC voltage utilization that lead to bad compensation result. Therefore, we put forward another SVPWM based control strategy in which a relationship between the current reference instruction of active power filter and the voltage reference instruction of SVPWM is found via the topological structure of shunt active power filter. Then we can use SVPWM method to accurately track and compensate the harmonic current. Simulation and experimental results show that the control strategy can solve the above proposed problems and bring about very good harmonic compensation effect.

scholarly journals Full-bridge MMC DC fault ride-through and STATCOM operation in multi-terminal HVDC grids

2017 ◽  
Vol 65 (5) ◽  
pp. 653-662 ◽  
Author(s):  
E. Kontos ◽  
G. Tsolaridis ◽  
R. Teodorescu ◽  
P. Bauer
Keyword(s):  
Reactive Power ◽  
Fault Isolation ◽  
Voltage Reference ◽  
Dc Voltage ◽  
High Voltage Direct Current ◽  
Dc Fault ◽  
Current Controller ◽  
Fault Ride Through ◽  
Transition Points ◽  
Control Methodology

Abstract This paper investigates a control structure to enhance the DC fault ride-through capability of a full-bridge modular multilevel converter (MMC) station, while ensuring a stable controlled operation as a STATCOM during DC faults without the need for fault isolation. Taking advantage of the switching states of a full-bridge submodule, a DC current controller is proposed, which provides the DC voltage reference for the modulation when a DC fault is detected. By changing the outer controllers strategy from DC voltage or active power control to converter energy control during a fault, the decoupling of the converter operation from the DC side dynamics is realized. In this paper, the focus is on the control methodology at all times of operation and the evaluation of the STATCOM control during a fault. To this end, extensive simulations were performed on a three-terminal high voltage direct current (HVDC) grid in radial configuration and a pole-to-pole DC fault case was investigated. The results showed that the AC voltage and current were controlled within limits at all times, while the full-bridge MMC was able to provide reactive power support to the AC grid. Moreover, using the proposed control methodology, the transients at the operation transition points between STATCOM and inverter/rectifier operation were minimized and the stations were able to safely ride through the fault.

scholarly journals PROGRAMMABLE, ANALOGUE, BIPOLAR, DC ± 4.095 VOLTAGE REFERENCE, INTERFACED THROUGH USB PORT AND COMPLIED IN LABVIEW

2014 ◽  
pp. 133-137
Author(s):  
ANUJA YADAV ◽  
NANDKISHOR GHODKE
Keyword(s):  
Programming Language ◽  
Application Software ◽  
Voltage Reference ◽  
Dc Voltage ◽  
Graphical Programming ◽  
Graphical Programming Language

A designed DAC circuit to generate an analog bipolar DC voltage reference 4.095V for an in-house application interfaced through USB port for automation. A USB to Parallel FIFO development module UM245R, the latest device to interface from FTDI Chip is incorporated for the same. Compiled the supporting application software in a Graphical Programming Language “LabVIEW” by National Instruments with executable VI functions provided by FTDI.

A Single-Stage Square Wave Buck-Boost Inverter

2015 ◽  
Vol 793 ◽  
pp. 280-285
Author(s):  
J.A. Soo ◽  
N.A. Rahman ◽  
J.H. Leong
Keyword(s):  
Duty Cycle ◽  
Output Voltage ◽  
Boost Converter ◽  
Single Stage ◽  
Experimental Results ◽  
Voltage Source ◽  
Voltage Waveform ◽  
Boost Converters ◽  
Dc Voltage ◽  
Square Wave

This paper proposed a novel single-stage square wave buck-boost inverter (SWBBI). The proposed inverter is designed by using dual buck-boost converters. The input DC voltage of the proposed inverter can be either stepped-down or stepped-up in square output voltage waveform depending on the duty-cycle applied for each buck-boost converter. This characteristic is not found in conventional voltage source inverter where the output voltage is always lower than the input DC voltage. The proposed inverter is analyzed by a series of simulations using MATLAB/Simulink as well as experiments by using different values of duty-cycle. A conclusion about the feasibility of the proposed inverter is given by comparing the simulation and experimental results.

Integrated Instrument Based on SOPC

2012 ◽  
Vol 214 ◽  
pp. 141-147
Author(s):  
Zheng Ma ◽  
Ming Liu Liu ◽  
A Hui Yang ◽  
You Yang Liu
Keyword(s):  
Sine Wave ◽  
Signal Generator ◽  
Soft Core ◽  
Control Center ◽  
Dc Voltage ◽  
Square Wave ◽  
Digital Oscilloscope ◽  
Dc Current

This instrument based on SOPC technology is embedded with a NIOS soft-core in Cyclone III as a control center that integrates digital oscilloscope, DDS signal generator and a simple digital multi-meter. It can measure AC signal of 200 Hz-5MHz and 10mVpp-10Vpp, display and store the wave, and can also manually and automatically adjust the amplitude and frequency. This instrument can generate sine wave of 10Hz to 1.5MHz, square wave of 10Hz to 200 KHz, triangle wave, and saw-tooth wave vary from 150mVpp to 10Vpp. Also, it can measure AC and DC voltage of 20mV to 200V, the AC and DC current of 2mA to 1A, resistance of 20Ω to 2MΩ, maintaining 5% accuracy. It is simple, easy to use, can fulfill the general experiment requirements with good performance and strong practicability.

Sign in / Sign up

Export Citation Format

Share Document