Based On Constant Current Source Electrical Energy Collector Design Of Magnetic Resonance Sounding Instrument For Detecting Groundwater

The power system is an indispensable part of modern instruments. The powersystem of MRS groundwater exploration instrument developed Jinlin University is animportant part of the instrument that has carried out twice improvement. The firstedition of the power system established the basic framework for emission currentrequirements to meet the MRS groundwater detector. However， in practical work，the transformer winding is pine， insufficient drive capability of the driver circuit，purchase of inductance in the work easily filled，and heat sink area too small and theoverall loss is too large. The second edition of the power system on appeal issueswere effectively addressed and greatly improve the efficiency and points ofmeasurement. however， the residual energy left in the capacitor after launch still usethe power of resistance to let go of the form， which part of the energy are wasted. Ifthis part of the energy recovery to the battery， you can increase the working hours ofthe battery and increasing the number of points of measurement. On the other hand，a small amount of energy that can not be recycled， you can use the automaticdischarge released， thus improving convenience.The main work is to design electrical energy collector， which the recovery ofsurplus energy in the electrolytic capacitor supply switching power technology toextend battery time and electricity can not be recycled through the resistor to wouldbe released. Electrical energy recycling is the recycling of electrical energy on thecapacitor after launch and back to the battery from the capacitor to store electricalenergy in energy guide when the capacitor voltage is0V to300V and the batteryvoltage is24V. To the battery must meet the electrical energy back into the batterycharging condition that the charging voltage must be greater than24V， so the work of the electrical energy collector is divided into three stages. First stage: the capacitorvoltage is greater than or equal to27V buck conversion circuit at a constant currentrecycling electrical energy. The second stage: when the energy in the energy storagecapacitor is limited to the current recycling of electrical energy the capacitor voltagewill continue to decline to some point on the capacitor voltage less than27Vhowever， it also has enough energy to charge the battery so this article use boostconversion circuit to continue to recycle electrical energy. The last stage: when theenergy in the capacitor has been insufficient to charge the battery using the boostconversion circuit through a resistor to the hot consumed.Concentrated exposition of this article has the basic structure of the batteryenergy collector; works and charging characteristics of the battery; charging of thebattery; switching power conversion circuit concepts and principles， then given buckconverter circuit design and simulation; boost converter circuit design and simulation;undervoltage protection circuit design; acquisition and switching circuit design;software design， and finally given the various modules of the test conditions and infact measured to verify the feasibility of the overall design of the program.