58彩票The factors that rely on the functionality of the sensing element must be taken low to minimize power loss:

The current sensed value usually depends on the threshold voltage of the circuit, and its operation is entirely based on the sensed current information. In order to improve the accuracy of current sensors, we must consider the low-temperature coefficient: in terms of accuracy, temperature is the main coefficient of resistance. Throughout the operation, a resistance with a temperature coefficient close to zero should be used. The power derating curve can provide allowable power at different temperatures. But peak power capability is a function of energy. Therefore, the energy level curve should be considered.

58彩票The advantages and disadvantages of current detection resistors include

advantage:

Compared to other devices, the cost is very low.

High dimensional error

The computable current range ranges from extremely low to medium

Ability to determine direct current or alternating current

Introducing additional resistors into the tested circuit path may increase the source output resistance and result in adverse load effects.

58彩票Due to the direction of power consumption, power will be lost. Therefore, current detection resistors are rarely used for low to medium current detection applications.

There are two methods for current sensing:

1. DC induction:

DC sensing depends on Ohm's law. By arranging the shunt resistor together with the system load, a voltage proportional to the system load current will be generated at both ends of the shunt resistor. The voltage on the shunt can be measured by a differential amplifier, such as a current shunt amplifier, operational amplifier, or differential amplifier. It is usually used for<; A load current of 100A.

2. Indirect current induction:

Indirect current sensing depends on Ampere's law and Faraday's law. By placing a loop around a current carrying conductor, a voltage proportional to the current can be induced on the loop. This sensing method is suitable for load currents ranging from 100A to 1000A, and the accuracy of the current sensor will also be relatively high.