A current detection circuit with controllable detection current

Abstract

The present application includes a current detection circuit with controllable detection current, and specifically relates to the technical field of current detection. The circuit includes a unit to be tested, a first resistor, a first controllable current source, a second controllable current source, an upper clamp unit and a lower clamp unit; the power supply voltage end of the circuit passes through the first resistor and the unit to be tested in sequence Grounding; the power supply voltage terminal is grounded sequentially through the first controllable current source and the second resistor; the upper clamping unit is connected to the connection node between the first controllable current source and the second resistor; the lower clamping unit is connected to the first controllable current Connection node of the source to the second resistor. In the above solution, the voltage difference between the two ends of the second resistor is controlled by the upper clamping unit and the lower clamping unit, so that the voltage difference between the two ends of the second resistor is guaranteed to be within a certain range, thereby generating a clamping function for the detection current , no need to add an additional compensation circuit, which reduces the complexity of the current detection circuit and also reduces the cost of the current detection circuit.

Description

technical field [0001] The invention relates to the field of current detection, in particular to a current detection circuit with a controllable detection current. Background technique [0002] In the control loop of the prior art, it is usually necessary to detect the current, and the detected current obtained by the detection is input into the control loop as a control input, so as to realize the normal operation of the control loop. [0003] In order to prevent the detection current obtained by the detection from being too large or too small, so that the control loop will be out of control and the main power circuit will be damaged after the too large or too small detection current is input into the control loop. The detected detection current is clamped and controlled, while in the prior art, when the detection current is clamped and controlled, the current signal is usually converted into a voltage signal, and closed-loop adjustment is performed through an operational a...

AI Technical Summary

Problems solved by technology

[0004] However, in the above solution, the structure of the current detection circuit for detecting the current clamping function is complex, and an additional compensation circuit needs to be added, resulting in a large loss of integrated circuit chip area, and only unilateral current clamping can be performed in the prior art. Bilateral current clamping requires two sets of detection current control systems, further occupying the chip area, and the cost of the current detection circuit is relatively high

Images