Novel underground motor drive circuit

Abstract

The invention provides a novel underground motor drive circuit, and belongs to the field of drive control of logging instruments for an oil well, a gas well and a water well and various intelligent underground tool motors. The novel underground motor drive circuit is an H type circuit, which comprises a logical control circuit and a dual-bridge circuit conducting circuit, wherein the logical control circuit comprises a positive rotating control circuit and a negative rotating control circuit; the dual-bridge circuit conducting circuit comprises an A bridge circuit drive output circuit and a B bridge circuit drive output circuit; a motor is driven via the A bridge circuit drive output circuit or the B bridge circuit drive output circuit; the motor is positively rotated and negatively rotated or stopped by adding different negative working voltages, so as to control a current collecting umbrella to be opened and closed. With the adoption of the novel underground motor drive circuit, the contact change-over can be saved; a well can be measured with a plurality of parameters; the novel underground motor drive circuit is wide in the scope of power supply voltage, simple in operation, and reliable in work, and has the capacity of providing higher working voltage and larger driving current to the motor under a high temperature condition; and the novel underground motor drive circuit is suitable for being applied to controlling the drive of the logging instruments for the oil well, the gas well and the water well and various intelligent underground tool motors.

Description

technical field [0001] The invention belongs to the field of drive control of downhole logging instruments for oil, gas and water wells and various intelligent downhole tool motors, and in particular relates to a novel downhole motor drive circuit. Background technique [0002] At present, the downhole logging tools used in domestic oil, gas and water wells are mostly multi-parameter logging tools, in which the flow and water cut instruments use umbrella-type current collectors to collect current, and measure flow and water cut at fixed points, usually controlled by a motor drive circuit The opening and closing of the collecting umbrella. [0003] The motor drive methods used in the past mainly include: negative voltage umbrella opening, positive voltage umbrella closing and relay control negative voltage opening and closing umbrella two ways. [0004] Among them, such as figure 1 As shown, the working principle of the motor drive circuit with negative voltage umbrella ope...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is: the relay is a contact element, and the power-on time of each pin is not synchronized after passing through the logging cable during work, causing the short-circuit contact to be welded and cannot be released, and the circuit is damaged

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