Ground magnetic resonance multi-level regulation fast and high-precision charging device and charging control method

Abstract

The invention belongs to the field of geophysical exploration equipment, and relates to a ground magnetic resonance multi-stage control fast high-precision charging device and charging control method.The device is controlled by a main control module according to the difference between the precharge voltage and the actual voltage, and is connected from parallelly-connected DC-DC Converter Modules.by selecting multiple DC-DC converter modules, The DC / DC converter module rapidly charges the energy storage capacitor in a constant current mode, and the DC-DC converter module steps by steps according to the decrease of the difference value. The DC converter module performs soft shutdown, and then controls the last DC which is not soft shutdown according to the difference. The DC converter module charges that energy storage capacitor in a constant voltage mode; Or controlling a DC capable of switching between a constant voltage mode and a constant current mode according to a difference between the precharge voltage and the actual voltage. A DC convert module charges that energy storage capacitor in a constant voltage mode. Multi-parallel DC / DC converter module is used to charge the energy storage capacitor, and the charging speed and precision of the charging device are effectively improved through multi-stage constant current charging and single-stage constant voltage charging mode.

Description

technical field [0001] The invention relates to the field of geophysical exploration equipment, in particular to a ground magnetic resonance multi-stage regulation fast and high-precision charging device and a charging control method. Background technique [0002] Ground magnetic resonance technology (Magnetic Resonance Sounding, MRS) is a non-invasive new geophysical method that can directly detect groundwater, and is widely used in groundwater detection at a depth of 0 to 150m. When the nuclear magnetic resonance water detection system detects groundwater, it includes three processes: charging the energy storage capacitor, current emission and signal acquisition. Energy storage capacitors provide energy and power for instantaneous high-power pulse current transmission. Generally, high-voltage, large-capacity capacitors (450V, 22000uF) are used. The working efficiency of the ground magnetic resonance system is greatly affected by the charging time. In addition, the chargin...

AI Technical Summary

Problems solved by technology

Therefore, the charging speed and charging accuracy of the energy storage capacitor seriously affect the working efficiency and detection effect of the ground magnetic resonance system

[0003] Disclosed in the related art is a kind of constant-current charge-discharge power supply device based on a network-based nuclear magnetic resonance water detector. Although the invention adopts the low-power constant-current charging mode, which is simple in design and easy to control, it has the following defects: (1) when charging When the preset value is reached, overcharging or undercharging is likely to occur when the current is large when it is turned off, and the charging accuracy cannot be ensured; (2) when the charging is completed, the charging power supply is forcibly turned off, and the charging module will generate spikes to damage the device and reduce the charging rate. Module life

However, the device still has the phenomenon of overcharging or undercharging, and the problem that the charging system is easily damaged due to spikes caused by hard shutdown

[0005] The charging device and charging method of the ground magnetic resonance water detection system in the above-mentioned related technologies all have the problems of low charging accuracy and easy damage to the charging system due to hard shutdown.

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