Unipolar trapezoidal pulse current control method and device of inductive load

Abstract

The invention relates to a unipolar trapezoidal pulse current control method and a device of an inductive load, which are applicable to leading a sending machine with the transient electromagnetic method to generate pulse current in a sending coil and can be applied in the fields of geophysical prospecting and nondestructive detection. The method comprises the steps of setting the current amplitude of a constant current source and the current amplitude of a load, calculating a constant current inductor, setting the clamping voltage of an ascending edge and the clamping voltage of a descendingedge, changing the slopes of the ascending edge and the descending edge, leading a driving signal synthesis circuit to control the conduction and the disconnection of a switch tube and outputting theunipolar trapezoidal pulse current. The device comprises a direct current power supply, the constant current inductor, a control circuit of the constant current source, the inductive load, a constantvoltage clamping circuit of the ascending edge, the constant voltage clamping circuit of the descending edge, the current control circuit of the load, a time sequence control circuit, the driving signal synthesis circuit, a driving circuit and an electronic switch. The method and the device have the advantages that the method and the device realize the current linear ascending of the load, the front edge and the back edge are symmetric, the current amplitude of the load is constant, and the unipolar trapezoidal pulse current is generated.

Description

technical field [0001] The invention relates to a unipolar trapezoidal pulse current control method and device for an inductive load, which is suitable for generating pulse current in a transmitting coil of a transmitter for transient electromagnetic detection, and is applied in the fields of geophysical exploration and nondestructive testing. Background technique [0002] Transient electromagnetic method is one of the important methods to detect the electrical parameters of underground media and other information, and has broad application prospects in mineral exploration, groundwater detection, engineering monitoring, soil salinization investigation, non-destructive testing and other fields. The transient electromagnetic method usually uses a pulse current with a constant amplitude to establish a primary magnetic field underground, and the pulse current is periodically turned off to detect the secondary magnetic field generated by the geological body. By analyzing and proce...

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Problems solved by technology

For example, the patent authorization number is ZL200410081518.9 "control method and device for linearly adjustable falling edge of current pulse with rising edge lifting capability", which can realize linearly adjustable falling edge, but not linearly adjustable rising edge

Another example is the "Broadband Constant Amplitude AC Square Wave Current Control Method and Device for Inductive Loads" whose patent authorization number is ZL200810069272.1. Bipolar AC square wave

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