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When an electrical current passes through a resistor due to the presence of a voltage across it, electrical energy is lost by the resistor in the form of heat and the greater this current flow the hotter the resistor will get. This is known as the Resistor Power Rating. Resistors are rated by the value of their resistance and the electrical power given in watts, (W) that they can safely dissipate based mainly upon their size. Every resistor has a maximum power rating which is determined by its physical size as generally, the ...
Date：2019-11-05 [More+]
In recent years, renewable energy options have become much more efficient and feasible. This has led to a large adoption of these applications, an especially poignant point in the face of current environmental issues. However, just like all other power generation methods these applications require resistors. Microhm Electronics provide various power resistors for this application, such as TO-220 type, TO-247 type, NUAL series, MMS series and more. With the recent news that E.ON UK plans to power more than 3.3 million custome...
Date：2019-11-04 [More+]
Current sensing is a critical function in electronic systems but comes with complexities that are often underestimated. This part we discuss current sense resistors. MPR series, MVR series and MMS series form Microhm Electronics are popular current sense resistors. Accurately measuring current flow is not nearly as easy as measuring voltage and is even more difficult when trying to measure the current flowing through a load connected to relatively high-power supply voltages. Current sense resistors, also called shunt resistor...
Date：2019-11-04 [More+]
Current sense resistors are very low value resistors used to measure the current flowing through it. Microhm Electronics MVR2321-4, MPR series, MMS series are most often used current sense resistor. The current through the resistor is represented by the voltage across the resistor, so by applying I = V/R as set down by the famous school teacher Georg Simon Ohm, the current is proportional to the voltage across the resistor. This simple introduction to the topic is the beating heart of the rest of this current article. The to...
Date：2019-11-01 [More+]
The key advantage of designing an SMPS with higher switching frequencies is to reduce the size of passive components and in turn increase the overall power density. One downside is that this increased power density multiplies the potential for damage in the event of an overcurrent event. Overcurrent events are an ever-present risk for SMPSs. Among other problems, overcurrent spikes can cause false triggering due to external parasitic inductance from the source pc board trace. While rapid overcurrent protection (OCP) is impor...
Date：2019-10-31 [More+]
The range and complexity of electrical equipment has increased dramatically in recent years. An unwanted consequence of this rise is the creation of harmonic currents, which can cause voltage distortion and quality problems. Also known as damping resistors, harmonic filters reduce distortions in power systems, which can be produced by nonlinear loads such as arc furnaces and switch-mode power supply (SMPS). Harmonics can have adverse effects on the power supply network. If the nonlinear loads produce unwanted harmonics, they...
Date：2019-10-31 [More+]
Increasing customers are looking for non-inductive resistors for their application, like power amplifier. Microhm Electronics provides various non-inductive resistors, such as NTW series, TWC series. Then what is resistor inductance? Lets figure it out. Inductance is an electrical property of conductors by which an electrical current passing through the conductor induces an electromotive force in the conductor itself (self-inductance) and other conductors nearby. Since resistors are made of conductive materials, they, too, ex...
Date：2019-10-28 [More+]
After value, power dissipation is the next most important characteristic of a resistor. An overloaded resistor often changes in value over time and can often get hot enough to burn itself and surrounding components. Every circuit designer learns the smell of burnt resistor sooner or later! The common rule of thumb is to calculate how much power the resistor will have to dissipate and then use the next largest size or a factor of two higher dissipation rating, whichever is larger. The power rating is based on unobstructed air ...
Date：2019-10-28 [More+]
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