High-voltage end current detection circuit

Abstract

The invention discloses a high-voltage end current detection circuit. The circuit comprises a mapping unit, a correction feedback unit, a modulation unit, an execution unit and a load, wherein the correction feedback unit comprises a resistance potential-divider network, a reference voltage unit, a subtraction unit, a first logarithm operation unit, a second logarithm operation unit, a current superposition unit, a voltage / current conversion unit and a summator. The current has the characteristics of high current detection accuracy, wide application range and low system cost.

Description

technical field [0001] The invention relates to a high-voltage terminal current detection circuit, which is mainly applied to current modulation during high-voltage power supply. Background technique [0002] In systems powered by high voltage, it is often necessary to detect and control the amount of current at the high voltage end. If high-voltage devices are used to detect and control the current at the high-voltage end, the cost will be very high, and sometimes it is impossible to realize when the voltage is very high. [0003] In order to detect and control the amount of current at the high voltage end, the main methods currently used include: [0004] (1) A compromise solution is adopted to detect and control the current at the low voltage end of the current loop. [0005] (2) Use a high-voltage integrated circuit to detect, process and control the amount of current. [0006] The first method above is easy to implement and low in cost. The disadvantage is that some...

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Problems solved by technology

[0010] The invention solves the problem that the accurate detection of the high-voltage terminal current cannot be realized when the voltage is relatively high, and can effectively reduce the system cost

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