Power Shunt Guides The high voltage resistors can be found in various designs. Each of these resistors is used for different purposes and applications. Most manufacturers are focused on delivering designs of application and customer specific resistors. They usually come in low and medium volume. These types of resistors can be used in numerous applications and they are retaining the complete understanding of resistors’ application and technology issues.
The manufacturers need to understand also that the users do not want to risk and compromise the system or component failure through the use of standard resistor products. They do not achieve the accurate specification needed; however, these have been the closest available materials. There are also manufacturers that offer application-specific high voltage resistor products that come in low up to medium volume.
The major application of a high voltage resistor has been the circuit protection sensitive elements in power suppliers, but other applications include motor control, anti static system, medical device, divider circuit, military system, balancing and emitter resistor. The capability to manufacturer depends on some elements. These involve the TCR or temperature coefficient of resistor, wattage ranges, ohmic ranges, and voltage.
High voltage resistors have special requirements. These requirements are asked in the aspect of high voltage applications. The typical carbon film resistors’ ¼ watt are available in various electronics ranges from 250 volts to 500 volts which has been under the kilovolt level required. The voltage limitation is set through the power dissipation issues like a 10k resistor with one kilovolt across it dissipating 100 watts.
In terms of the lower current applications, the physical length of the device of about five to ten kilovolt. This is arching around the body of the resistor leading to a significant problem. Apart from it, some high voltage resistors were using spiral path of the dark ceramic metal oxide. Such kind of a high voltage resistor has been referred to as the “tiger stripe resistor”. Peak voltage capability is on body length’s function. Its voltage is about 50 kilovolt. An important type of resistor is the non-inductive tubular resistor or the bulk ceramic one. Because of a great resistive volume of the material, such kind of resistors should be capable of handling highly pulsed power than the wire wound or metal film counterparts. It is accomplished to obtain rapid energy counterparts. At the same time, this will also suit rapid energy dumping works.
Precision Shunt Resistor
Shunt resistors are usually associated a parallel position along with an instrument or the component. This is done to divert an electrical current. Such kinds of resistors are designed to give alternative path for current in case there is a failure. They can be used to reduce input sensitivity coming from the input lines proceeding directly to the ground.
A current shunt resistor is a low resistance and passive electronic device that is used to measure AC (alternative current) and DC 9direct current). This is directly proceeding to the voltage drop in which currents created all throughout the resistnace. Shunt resistors’ electrical specifications include ohms current rating, and power rating. Other specifications involved are the power coefficient of the resistance, temperature coefficient of the resistance and the resistance tolerance.
Ohm is used to measure the material’s opposition into the flow of electricity circuit. On the other hand, the temperature coefficient of resistance (TCR) is the resistance change with change in temperature. PCR or the power coefficient of resistance is referring to a temperature. This temperature rises because of self-heating. For the current-sensing shunts, the resistance usually ranges from 100 µO up to 500 mO. The shunt resistor is being used in the current conversion application and it requires high precision.
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The physical specifications for the shunt resistors involve resistor materials and lead type. A shunt resistor can be surface mounted, chassis mounted, through-hole mounted, and bolted. THT or the through-hole technology and SMT or the surface mount technology are both other popular and common mounting styles. Other lead types available are axial leads, radial leads, gull-wing leads, screw terminals, J-leads and tab terminals.
The shunt resistors that have no leads have been also available and the choices are thick film, wire wound, thin film, metal alloy, metal film, ceramic, carbon film, and metal oxide. A carbon shunt resistor is comprised of resistive, solid, ceramic, and high temperature materials. These were connected by metal contacts. The metal alloy shunt resistor contains more than 2 metallic elements and the wire wound shunt resistor has been composed of thin wire winding into the ceramic rod.
Each shunt resistor becomes unique in the area of packing because of passive electronic components that were packed in tape reel assemblies. This includes carrier tape which had embossed cavities for individual component storage. Others have been packed in trays (or trails) and they had been made up of carbon-power and fiber materials as they molded in rectangular outlines containing uniformly spaced matrices of pockets. Some of them have been packed in a tray (trail) and were comprised of both fiber and carbon-power materials. At the same time, these are molded in a rectangular form that has numerous pockets which were uniformly spaced.
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