Category | Power Design

Basic Considerations for Semiconductor Protection with Fuses

Posted on 23 April 2019

              Solid state devices have progressed through several generations of sophistication since their introduction in the 1940s. Fuse designs have changed to match solid state protection demands. The protection task seems simple - choose a fuse of correct voltage and ampere rating which will protect a solid state device [...]

Loss Reduction in Power Electronics Switches by Soft Switching

Posted on 19 April 2019

              Soft switching is a possible way of reducing losses in power electronic switches. The expression "soft switching" actually refers to the operation of power electronic switches as zero-voltage switches (ZVS) or zero-current switches (ZCS). The many different converter circuits that working according to these principles are generally assigned [...]

Graphs of temperature-dependence of back saturation current for a thyristor Т243-500 (continuous curves) which conforms to 2 reverse voltage values V. The point graph corresponds to dependence Is(T), calculated by the formula (20).

Modeling of Temperature Dependence of Power Semiconductor I-V Curves

Posted on 10 April 2019

              The I-V curve is the most important parameter of power semiconductors (PSD), since power semiconductor output capacity and efficiency depends upon it to a great extent. Many publications are devoted to the analysis of the physical phenomena determining I-V curves of power semiconductor devices (e.g. the monographies [1, [...]

Effects of Humidity on Power Electronics Design

Posted on 08 April 2019

                Air humidity is likely to condense at all parts of a device if the device temperature differs from the air temperature to a certain extent. In extreme cases, condensation causes the generation and accumulation of water droplets which might be drawn to moisture sensitive components such as [...]

Series and Parallel Connection of Diodes and Thyristors

Posted on 25 March 2019

                    Parallel connection of thyristors In parallel thyristor circuit arrangements, homogenous current distribution is required from the moment of firing and throughout the entire current flow time. For this purpose, steeply rising trigger pulses of sufficient amplitude, as well as symmetrical line impedances in the main [...]

Solar Power System Control and Safety

Posted on 20 March 2019

  The Copenhagener climatic conference in 2009 and the earlier Kyoto protocol (adopted in 1997 and enforced as of 2005) committed different national governments to decrease their CO2 emissions. One of the possible ways to achieve these goals is to increase the production of sustainable energy and to issue a grant for every initiative taken. [...]

Thermal Paste Application

Posted on 18 March 2019

              Designated use of thermal interface material (TIM) When in operation, power modules produce losses which increase the module temperature and impair module efficiency and/or functionality. To dissipate the heat that builds up in power modules, the power modules are mounted onto heat sinks. The heat is then dissipated [...]

Epcos PTC thermistor

PTC Thermistors for Overcurrent Protection

Posted on 15 March 2019

              As to their possibilities of application, PTC thermistors (Positive Temperature Coefficient thermistors) can be divided in the following manner: 1. By Function 2. By Application Ceramic PTC thermistors are used instead of conventional fuses to protect loads such as motors, transformers, etc., or electronic circuits against overcurrent. They [...]

Example of an IGBT behaviour model with equivalent circuit elements

Semiconductor Models

Posted on 11 March 2019

                This article looks at semiconductor models used in electric circuit simulation. Before starting to look for suitable models, the following question must always be answered: What properties does my model have to have to meet the simulation task at hand? Analysis of the circuit operating principle: Ideal [...]

IGBT and Diode Switching Loss Calculation

Posted on 08 March 2019

              In power electronics, both IGBT and diodes are operated as switches, taking on various static and dynamic states in cycles. In any of these states, one power dissipation or energy dissipation component is generated, heating the semiconductor and adding to the total power losses of the switch. Suitable [...]