Amplifier power supply circuit of balance bridge and bridge amplifying circuit

Abstract

The invention discloses an amplifier power supply circuit of a balance bridge and a bridge amplification circuit, and the circuit comprises an isolation switch power supply circuit of which the input end is connected with a bridge excitation power supply of the balance bridge, and the isolation switch power supply circuit is used for boosting bridge excitation of the balance bridge through an isolation switch power supply of the isolation switch power supply circuit to obtain boosted electric energy; the input end of the linear voltage stabilizing circuit is connected with the output end of the isolating switch power supply circuit, and the linear voltage stabilizing circuit is used for carrying out linear voltage stabilization on the boost electric energy to obtain a preset number of groups of power supply electric energy and supplying power to an amplifier connected with the balance bridge by utilizing the power supply electric energy; an isolation power supply and linear voltage stabilization mode is adopted, power is directly taken from a bridge excitation power supply to supply power to the amplifier of the balance bridge, so that the amplifier does not need external power supply, the power supply difficulty of the amplifier of the balance bridge is reduced, and the circuit complexity of a bridge amplification circuit and the number of power supplies are reduced; and the isolation switch power supply can be utilized to avoid the occurrence of loop current and improve the measurement accuracy.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to an amplifier power supply circuit of a balance bridge and an amplifier circuit. Background technique [0002] The balance bridge (such as the Wheatstone bridge) is a high-precision measurement bridge, which has a wide range of applications in various measurement fields and is an important measurement circuit. [0003] The amplifier of the existing balance bridge (such as the Wheatstone bridge) is generally placed on the acquisition side, and the power supply is centralized; if it needs to be pre-connected to the balance bridge end, it needs to be powered separately. like figure 1 In the traditional bridge amplifier circuit shown, the bridge output is amplified and output by a low-noise programmable amplifier (AD8221), thereby reducing signal interference and errors in transmission; its power supply requires two sets of power supplies: bridge excitation and signal groun...

AI Technical Summary

Problems solved by technology

like figure 1 In the traditional bridge amplifier circuit shown, the bridge output is amplified by a low-noise programmable amplifier (AD8221), thereby reducing signal interference and errors during transmission; its power supply requires two sets of power sources: bridge excitation and signal ground, amplifier Power supply +Vs, -Vs, signal ground; this not only complicates the power supply, but also because the ground level of the two power supplies is inconsistent when the amplifier power supply and the bridge power supply share the same ground, a loop current will appear, causing measurement errors

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