Voltage clamping circuit

Abstract

The invention discloses a voltage clamping circuit, and belongs to the field of integrated circuits. The circuit comprises a reference voltage generation unit connected with a power supply end and used for generating a reference voltage according to the working voltage of the power supply end, and the reference voltage generation unit comprises a first clamping circuit connected to a first node from the reference voltage; a second clamping circuit connected from the reference voltage to the second node; an operational amplifier unit which is connected with the reference voltage generation unit and is used for adjusting the error range of the first node and / or the second node through an operational amplifier loop; and a clamping acceleration unit which is connected with the operational amplifier unit and is used for generating an acceleration driving signal and accelerating the operational amplifier loop according to the acceleration driving signal. The invention has the beneficial effects that the circuit clamping precision is improved, the node establishing time is shortened, and the loop stabilizing speed is increased.

Description

technical field [0001] The invention relates to the field of integrated circuits, in particular to a voltage clamping circuit. Background technique [0002] In various power electronic systems, the analog signal voltage may exceed a certain limit value, which will lead to many problems such as poor circuit performance, circuit overdrive, and damage to downstream devices. Therefore, nodes that are sensitive to voltage amplitudes need to add clamping circuits. [0003] In the prior art, the clamping circuit usually uses the unidirectional conduction characteristic of the diode to open-loop clamp the input node or the output node of the clamped circuit. The clamping error of the clamping circuit is relatively large, and cannot be applied to high-precision electronic systems. At present, there are also some high-precision clamping circuits that are clamped at the input node, but the circuit is complex, and there are many problems such as loss of precision whether it is clamped...

AI Technical Summary

Problems solved by technology

The clamping error of the clamping circuit is relatively large, so it cannot be applied to high-precision electronic systems

At present, there are also some high-precision clamping circuits that are clamped at the input node, but the circuit is complex, and there are many problems such as loss of precision whether it is clamped or not. At the same time, the voltage establishment speed is relatively slow due to the phase delay node, so for For the above problems, it is urgent to design a voltage clamping circuit to meet the needs of actual use

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