A Double Full Bridge Feedback Voltage Compensation System

Abstract

Aiming at the attenuation of fluxgate excitation voltage caused by device loss, the present invention proposes a dual full-bridge feedback voltage compensation system, including two parts: real-time feedback calculation and dual full-bridge circuit, wherein the real-time feedback calculation is based on the collected excitation coil voltage as The feedback value, the main control chip calculates the difference between the excitation coil voltage and the system set voltage as the error, and calculates the turn-on time of each field effect transistor in the next cycle through the PI algorithm; the turn-on time of the field effect transistor calculated by the double full bridge circuit receiving feedback The control amount, the field effect tube is turned on and off at different stages to control the voltage at both ends of the excitation coil, and the excitation voltage is compensated to the system set voltage. The invention has the characteristics of fast response, accurate compensation, high reliability and no cumulative error, can quickly compensate the excitation voltage of the fluxgate to the set voltage of the system, and greatly improves the measurement resolution of the fluxgate.

Description

technical field

[0001] The invention relates to the field of geological exploration for fluxgate vector magnetic field measurement, in particular to a dual full-bridge feedback voltage compensation system for fluxgate excitation coil voltage with fast response and high reliability. technical background

[0002] The earth system is composed of different circles such as the earth's core, the earth's crust, the ionosphere, and the magnetosphere. Many processes occurring in each component will generate a magnetic field, which carries information about processes in different parts of the earth system. These information are important for understanding the earth system and mineral resources The basic information of the resource. The induced magnetic field caused by the space current system accounts for one-third of the actual anomalous field measurement. How to separate the induced magnetic field from the crustal anomalous field has always been a difficult problem to solve. The sp...

Examples

Embodiment Construction

[0019] The system control strategy is to set the initial working state according to the excitation signal frequency f, and the double full bridge circuit works in different stages T1-T8 such as Figure 4 As shown, the voltage at both ends of the excitation coil is collected in real time as the feedback signal, and the conduction time of the field effect transistor in the next cycle is calculated in the main control chip through the feedback signal. The conduction time is also used as the forward compensation stage T2 and the reverse compensation The conduction time of the FET in stage T6, when the conduction time changes, the main control chip dynamically adjusts T1-T8, and the overall working time is the period of the excitation signal. Among them, the main control chip receives the feedback excitation voltage digital value and compares it with the system set voltage value and makes a difference, and increases or decreases the conduction time of the field effect transistor acc...

technical field

[0001] The invention relates to the field of geological exploration for fluxgate vector magnetic field measurement, in particular to a dual full-bridge feedback voltage compensation system for fluxgate excitation coil voltage with fast response and high reliability. technical background

[0002] The earth system is composed of different circles such as the earth's core, the earth's crust, the ionosphere, and the magnetosphere. Many processes occurring in each component will generate a magnetic field, which carries information about processes in different parts of the earth system. These information are important for understanding the earth system and mineral resources The basic information of the resource. The induced magnetic field caused by the space current system accounts for one-third of the actual anomalous field measurement. How to separate the induced magnetic field from the crustal anomalous field has always been a difficult problem to solve. The sp...

Examples

Embodiment Construction

[0019] The system control strategy is to set the initial working state according to the excitation signal frequency f, and the double full bridge circuit works in different stages T1-T8 such as Figure 4 As shown, the voltage at both ends of the excitation coil is collected in real time as the feedback signal, and the conduction time of the field effect transistor in the next cycle is calculated in the main control chip through the feedback signal. The conduction time is also used as the forward compensation stage T2 and the reverse compensation The conduction time of the FET in stage T6, when the conduction time changes, the main control chip dynamically adjusts T1-T8, and the overall working time is the period of the excitation signal. Among them, the main control chip receives the feedback excitation voltage digital value and compares it with the system set voltage value and makes a difference, and increases or decreases the conduction time of the field effect transistor acc...

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