High-side current monitoring device

Abstract

The invention discloses a high-end current monitoring device for monitoring load current flowing in a load device. The high-end current monitoring device comprises a current mirror unit, an active high voltage unit, a voltage detection unit and a bias voltage unit, wherein the current mirror unit generates and outputs mirror current according to the load current; the active high voltage unit is electrically connected with the current mirror unit and receives the mirror current for working in a linear area for bearing high voltage; the voltage detection unit is electrically connected with the active high voltage unit for detecting voltage drop crossing the voltage detection unit caused by the mirror current; and the bias voltage unit is electrically connected with the active high voltage unit for providing bias voltage for the active high voltage unit. The invention aims at providing a high-end current monitoring device which has the advantages of simple circuit, low cost and wide detection range.

Description

technical field [0001] The invention relates to a current monitoring device, in particular to a high-end current monitoring device for high voltage input. Background technique [0002] At present, the existing high-end current monitoring devices mainly use Hall-effect integrated circuit current detectors and shunt resistance current detectors; the disadvantages of Hall-effect integrated circuit current detectors are slow response, large size and high price; therefore, At present, most users use shunt resistor current detectors. The advantages of shunt resistor current detectors are fast response and small size, but their disadvantages are that when applied to high voltage operation, an isolated power supply must be used, which will cause the shunt resistor current to be reduced. The circuit of the detector becomes complex and the cost increases. SUMMARY OF THE INVENTION [0003] In order to improve the above-mentioned disadvantages of the prior art, an object of the prese...

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Problems solved by technology

[0002] At present, the existing high-end current monitoring devices mainly use Hall-effect integrated circuit current detectors and shunt resistor current detectors; the disadvantages of Hall-effect integrated circuit current detectors are slow response, large size and high price; therefore, At present, most users use shunt resistor current detectors; the advantages of shunt resistor current detectors are fast response and small size, but their disadvantages are that they must use isolated power sources when they are used in high-voltage operations, which will reduce the current flow of shunt resistors. The circuit of the detector becomes complicated and the cost increases

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