At present, the principle of DC measurement can be basically divided into: resistance shunt method, hall principle, fluxgate principle, magnetoresistance principle, etc. among them, hall principle is the most common and the most widely used in the industrial market in recent years.
Hall principle usually has two control principles applied to current measurement.One is direct measurement. This method is the simplest and has the lowest cost. For occasions requiring low accuracy, such as occasions where 1% accuracy is acceptable. The other is the hall principle of closed-loop control, which uses negative feedback technology to keep the magnetic core in zero flux state, and the accuracy is about one order of magnitude higher than that of direct measurement. The highest accuracy is about 0.1% – 0.2%
Closed loop hall principle is usually used for measuring AC and DC, with fast response time, which can protect switching devices and the overall system. However, it is rarely used for DC current transmitter, which is rare in the market. Even if it is available, it is generally used for small current measurement.
PAS Technology created a DC current transmitter based on the closed-loop principle, with single power supply and dc0-5v output. Because the core adopts the closed-loop hall principle, the transmitter also has extremely fast response time, which can be conveniently used in occasions requiring rapid response, such as protection, etc.
The following is a DC current transmitter based on the closed-loop hall principle:
HDIE-C40-2000P1O2
The basic parameters are as follows:
Primary Current : DC2000A
Output Voltage: DC0-5V
Power Supply: DC24V
Accuracy : 0.2%
It is worth noting that due to the use of the closed-loop hall principle (negative feedback zero flux technology), the power consumption is relatively large. Theoretically, the current of 2000A needs 9.6w power, so a high-power power power supply is required.