Discussion on resistance characteristics and application of alloy
Date：2021-08-03Viewed：4221
Alloy resistors are common in circuit equipment, and the most common ones are chip alloy resistors and plug-in alloy resistors. Among them, there are precision differences in the resistance of the patch alloy, and some instruments need high-precision alloy resistance, which has higher precision and low-temperature drift characteristics than ordinary alloy resistance, but any alloy resistance has the following characteristics.
First, the shunt effect of alloy resistance on current
It is well known that resistors have shunt function, and alloy resistors also have shunt function. For example, if we put the alloy resistor and an LED light bulb in parallel in the circuit, the voltages at both ends of the alloy resistor and the bulb will be the same, and the sum of the currents flowing through the alloy resistor is equal to the total current flowing through the alloy resistor and the bulb. Many cases show that the alloy resistor plays a shunt role in the circuit.
Second, the role of alloy resistance can play impedance matching
We know that impedance matching can be realized by changing impedance, and alloy resistance can realize the function of impedance matching. General impedance matching In the process of signal transmission, in order to obtain the maximum power output state, several methods are adopted to adapt to the process of load impedance and internal impedance of excitation source, and alloy resistors are used for impedance matching.
Third, the role of alloy resistance is to divide the voltage in the circuit
In fact, the principle of voltage division of alloy resistance is the same as that of shunt. We can connect alloy resistors and other components. As in the LED circuit, the same current flows through the alloy resistance and lighting, and the alloy resistance and lighting and corresponding voltage are equal to the total voltage from both ends of the alloy resistance and lighting as a whole. At this time, the alloy resistance can divide the voltage in the circuit and protect the LED bulb from damage.
Fourth, the filtering effect of alloy resistance
The alloy resistor and capacitor are connected in series with RC charging and discharging circuit. The voltage at both ends of the connection point B of the first switch and the capacitor C without charge is zero. The switch S is a capacitor which is placed at one point and then the power supply starts charging through the alloy resistor R.. When the capacitor charge at both ends increases to balance the circuit, the power will no longer charge the capacitor. After the switch S is placed in B, the capacitor will start discharging, and the charge at both ends will gradually decrease to zero. Then placed in the charging switch S in the infinite cycle of charging, the alloy resistance function is used as the filtering effect.
Conclusion: In fact, in many cases, the function of alloy resistance is very similar to that of ordinary resistance, but the only difference is that its service life is much longer than that of ordinary resistance, because it is made of alloy materials such as copper-manganese alloy, copper-gold alloy and constantan alloy. Moreover, alloy resistance usually has a long life and its application range is constantly changing. At present, alloy resistance is used in many instruments and precision equipment.
The above content mainly introduces the characteristics and application of alloy resistance. If you need alloy resistance and other related products, please leave a message or call 0755-28100016; Massive alloy resistors are in stock with complete specifications. Welcome to inquire about the price or take samples for testing.
Shenzhen Shunhai Technology Co., Ltd. is an integrated supplier of electronic components, semiconductor devices and protection devices, Mainly engaged in TVS transient suppression diode, ESD electrostatic protector, GDT ceramic gas discharge tube, TSS semiconductor discharge tube, NTC thermistor, varistor, fuse, alloy resistor, chip resistor, precision resistor, wafer resistor, chip fuse, self-recovery fuse, chip capacitor, tantalum capacitor, electrolytic capacitor, aluminum electrolytic capacitor, supercapacitor, connector and other related product lines. Brands can be elected from Huade, Shuokai, Saruiwei, Yineng, Tesscara, KEMET, Tianer, Wangquan, Dayi, Murata, Taiyi, TDK, AVX, Weishi, Fenghua, Huaxin Branch, Sanying, Guoju, Lilong, Housheng, Guangluo, Shunluo, etc.
