Current Sense Resistors Experts These high voltage resistors are available in various designs and they are used for more specific purposes. Most of their manufacturers are specializing in the design of a customer or application specific high voltage resistor in a low to medium volume. These resistor types are available for various applications. Each of them retains the technology and application issues’ understanding.
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. These are not obtaining the main specification required. However, they were known to be the closest materials. There have been manufacturers that are offering products for high voltage resistor that are application-specific and are available in low to medium volumes.
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 manufacturing capability is defined through several factors or elements which include wattage range, temperature coefficient (TCR), voltage, ohmic ranges and more.
Power in Resistor
High voltage resistors got special requirements in terms of applications on high voltage. The common ¼ W carbon film resistor present in most electronics have been rated from 250V up to 500 V. This is actually below the kilovolt level requirement. The limitation of the voltage has been set through issues on power dissipation such as the 10k resistor having 1 kV across this dissipates 100W which is excessive to the common ¼ watt.
Even in terms of a low current application, physical length of a device of about one centimeter indicating about 5 to 10 kV which arch around a resistor body is a big problem. Aside from that, other high voltage resistors have been using the spiral paths of a darker metal oxide which is present in ceramic. This high voltage resistor is called as tiger stripe resistor. Its capability of peak voltage is usually the body length function and they come in voltage that is ranging about 50 kiloVolt. One essential kind of this resistor has been the non-inductive bulk ceramic or tubular resistor. 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. This is to make them perfect for high energy pulse and rapid energy dumping works.
Spiritual High Voltage Resistors
Shunt resistors have been integrated in the parallel form with the component or instrument in order to divert the electrical current. These have been providing the alternative paths for current just in case there is failure and may be utilized to complete the reduction in the sensitivity of input from an input line going to the ground.
The current shunt resistor has been generally passive and low resistance electronic devices that have been utilized in measuring DC (direct current) and alternating current (AC) through a voltage drop that the currents had created all through the resistance. The electrical specifications of the shunt resistors involve resistance tolerance, power rating, resistance power coefficient, resistance temperature coefficient, ohms, and current rating.
Ohm is measuring the opposition of the material to the electricity circuit flow while the TCR or temperature coefficient of resistance is referring to resistance change with temperature change. The power coefficient of resistance or PCR is the temperature that arise 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.
Shunt resistors’ physical specifications come in different forms. But these include the lead type as well as the resistor materials. The shunt resistors may be bolted, surface mounted, through-hole mounted, and chassis mounted. 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. Metal alloy shunt resistors got more than two metallic elements. On the other hand, a wire wound shunt resistor contains thin wire winding in the ceramic rod.
Every shunt resistor differs when it comes to packing method since other passive electronic components have been packed in a tape reel assembly including the carrier tape that has embossed cavities to store individual component. 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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