CN2595079Y - Assembled luminous field source for transient electromagnetic method - Google Patents

Abstract

The invention relates to a combined flash field source for transient electromagnetic method, which belongs to the technical field of applied geophysical prospecting. The utility model converts the DC low-voltage power supply into a low-voltage and high-frequency AC current through an oscillator, the low-voltage and high-frequency current forms a high-voltage and high-frequency AC current after being boosted, and the high-voltage and high-frequency AC current is rectified to form a high-voltage DC power supply as a storage The storage capacitor power supply is controlled by an electronic switch to supply power to the power supply circuit. The utility model has the advantage that a large instantaneous current can be obtained, but the average power consumption of the power supply is not large, and the effect of superposition of multiple waveforms can be achieved through the combination of multiple charging and discharging capacitors, so as to increase the exploration depth and suppress The purpose of various interferences, increasing the signal-to-noise ratio, improving data quality, and ensuring the exploration effect.

Description

A Combined Flash Field Source Used in Transient Electromagnetic Method

[Technical field] The utility model belongs to the technical fields of applied geophysical prospecting and engineering geological prospecting.

[Background technology] The most conventional field source system of the transient electromagnetic method uses control and switching to switch the DC power supply into a unidirectional or bidirectional square-like pulse current to supply power to the loop. Although the DC-DC conversion of the traditional transient electromagnetic method has been used for decades at home and abroad, geophysicists have been puzzled by the bulky power supply system for a long time. On the one hand, in order to increase the exploration depth, the power supply must be increased. Increasing the power requires a bulky power supply system, which makes the system very large and cannot be used in areas with difficult traffic conditions such as mountainous areas. On the other hand, reducing the power of the system cannot reach the desired exploration depth and cannot meet the needs of searching for deep ore bodies. .

[Summary of the invention] The purpose of this utility model is to provide a geological exploration power supply system suitable for use in mountainous areas.

The utility model of a transient magnetotelluric method combined flash type field source system is similar to the principle of a camera flashlight. Firstly, the capacitor is charged, and then the capacitor provides an excitation current to the power supply circuit. Since the internal resistance of the capacitor is small and the capacity is large, it can output High-intensity current can form a high-power excitation field source to achieve the purpose of geophysical exploration.

The utility model converts a low-voltage large-capacity DC power supply (such as a lead-zinc storage battery) into a low-voltage high-frequency square wave current through an inverter Q1, the positive pole of the DC power supply is connected with the collector of the inverter tube, and the other end is connected with the inverter The emitters of the tubes are connected, and the low-voltage and high-frequency square wave current is boosted by the transformer T1 to become a high-voltage and high-frequency power supply. The current is output by the two secondary pole coils of the transformer T1. The AC input terminals of the two rectifier bridges D1 and D2 are connected, and the two DC output terminals of the rectifier bridges D1 and D2 are respectively connected with the positive and negative poles of the high-voltage filter capacitors C1 and C2, wherein the DC output terminal and the positive pole of the filter capacitor are connected in series. Filtering resistors R1 and R2, the high-voltage and high-frequency current is rectified and filtered to form high-voltage DC; the high-voltage DC power supply first charges the energy storage capacitor for energy storage, and then the energy storage capacitor provides excitation current to the power supply circuit.

The inverter is a DC-AC conversion circuit, the booster is a high-frequency transformer, the high-voltage storage capacitor is a tantalum capacitor or an electrolytic capacitor, the controller is an electronic switch controlled by a computer, and the power supply circuit is a load system.

The voltage of the low-voltage DC power supply is 6-12V, the frequency of the low-voltage high-frequency current is 1024Hz, the voltage of the high-frequency high-voltage current is 400-800V, and the voltage of the DC high-voltage is 800-1000V.

Due to the large capacity of the energy storage capacitor and the small internal resistance of the capacitor, the utility model may output a high pulse current of hundreds of amperes in an instant. Strong high-power excitation field source; while obtaining a large instantaneous current, the average power consumption of the power supply is not large, thus making the entire power supply system light. The utility model adopts the combined flash field source system, which can achieve the superposition, amplification, delay attenuation and other effects of multiple waveforms through the combination of multiple charging and discharging capacitors in parallel and series, so as to increase the exploration depth and suppress various interferences. , Increase the signal-to-noise ratio, improve data quality, and ensure the exploration effect. A portable and efficient power supply is provided for carrying out the transient magnetotelluric method in the field.

[Description of drawings]

Fig. 1: the functional block diagram of the utility model;

Figure 2: schematic diagram of the circuit of the utility model;

Fig. 3: Symmetrical power waveform diagram produced by the utility model.

[Detailed ways]

Below in conjunction with accompanying drawing, the utility model is further described.

The inverter 1 inverts the DC low-voltage and large-capacity DC power supply into a low-voltage and high-frequency AC current, the booster 2 boosts the low-voltage and high-frequency current to form a high-voltage and high-frequency AC current, and the rectifier 3 rectifies the high-voltage and high-frequency AC current, The high-voltage DC power formed after rectification is stored in the storage capacitor 4, and the capacitive power stored in the capacitor is controlled by the electronic switch 5 to supply power to the power supply circuit 6. The control switch adopts different control methods to complete the combination of parallel connection and series connection of multiple charging and discharging capacitors, which can generate different current waveforms on the power supply circuit and generate different waveforms to excite the field source.

Controlled by a computer program, the controller, namely the electronic switch 5, is switched on and switched in different ways and times, and the storage capacitors C ₁ and C ₂ can be combined to generate the following excitation waveform current.

A single discharge of capacitor C ₁ can generate a positive pulse wave;

The discharge of B capacitor C ₂ alone can generate a reverse pulse wave;

C capacitors C ₁ and C ₂ are discharged separately at different timings to generate forward-reverse pulse waves;

D Capacitors C ₁ and C ₂ connected in series can generate a one-way pulse wave whose voltage is doubled by a single capacitor;

E capacitors C ₁ and C ₂ are connected in parallel, which can generate a current pulse wave whose discharge capacitance is twice that of a single capacitor;

F capacitors C ₁ and C ₂ are not simultaneously and successively discharged in the same phase to produce special pulse waves.

The utility model has been applied to many geophysical exploration methods (such as engineering geophysical detection, hidden danger detection of dams, ocean spectrum detection), and the field source waveform has good bidirectional symmetry. Working with this power supply can eliminate DC, 50Hz and its harmonic interference, improve the signal-to-noise ratio, and ensure the exploration effect.

Claims (3)

1. A combined flash field source for transient electromagnetic method, characterized in that: the utility model is to convert a low-voltage large-capacity DC power supply into a low-voltage high-frequency square wave current through an inverter Q1, and the positive pole of the DC power supply It is connected to the collector of the inverter tube, and the other end is connected to the emitter of the inverter tube. The low-voltage high-frequency square wave current is boosted by the transformer T1 and becomes a high-voltage high-frequency power supply. The current is supplied by the two secondary pole coils of the transformer T1. Output, the output terminals of the two secondary coils of the transformer are respectively connected to the AC input terminals of the two rectifier bridges D1 and D2, and the two DC output terminals of the rectifier bridges D1 and D2 are respectively connected to the positive and negative poles of the high-voltage filter capacitors C1 and C2 The filter resistors R1 and R2 are connected in series between the DC output terminal and the positive pole of the filter capacitor. The high-voltage and high-frequency current is rectified and filtered to form a high-voltage DC; the high-voltage DC power supply first charges the energy storage capacitor for energy storage, and then the energy storage The capacitor provides excitation current to the power supply loop. 2. The field source according to claim 1, characterized in that: the inverter is a DC-AC conversion circuit, the booster is a high-frequency transformer, the high-voltage storage capacitor is a tantalum capacitor or an electrolytic capacitor, and the controller is an electronic switch Controlled by computer, the power supply circuit is the load system. 3. The field source according to claim 1, characterized in that: the control switch adopts different control methods to complete the combination of multiple charging and discharging capacitors in parallel and in series, which can generate different current waveforms on the power supply circuit and generate different Waveform excitation field source.

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