Paralleled current sharing technology-based switching power supply circuit

Abstract

The invention provides a paralleled current sharing technology-based switching power supply circuit, which comprises a three-phase rectifier and filter circuit and a plurality of paralleled voltage-stabilized sources, wherein the three-phase rectifier and filter circuit comprises a three-phase full-bridge rectifier circuit and a capacitance filter circuit and is connected with a mud turbine generator; and each voltage-stabilized source comprises a fly-back transformer, a high-frequency rectifier and filter circuit, a sampling feedback circuit, a pulse-width modulation (PWM) control circuit and a current sharing circuit. The paralleled current sharing technology-based switching power supply circuit provided by the invention has the effects that the switching power supply circuit can be applied to a power supply system of an intelligent drilling tool employing an electronic control unit; stable direct-current electric energy is provided; the problems that a single switching power supply circuit is relatively low in output power and difficult to meet the high-power load requirements, and a plurality of switching power supply circuits are unbalanced in operation load during parallel connection are solved; the capacity of the intelligent drilling tool for carrying with the load is enhanced; the stability during operation is improved; and the service life during operation is prolonged.

Description

technical field [0001] The invention relates to a downhole power supply circuit for intelligent drilling tools, in particular to a flyback switching power supply circuit based on parallel current sharing technology, which belongs to the field of oil and gas drilling. Background technique [0002] Power supply is the heart of electronic equipment, and its quality directly affects the reliability of electronic equipment, and 60% of equipment failures are directly related to power supply. Now the power supplies used by electronic products are roughly divided into linear regulated power supply and switching regulated power supply. The power device of linear regulated power supply works in the amplification area. The disadvantage is that the conversion efficiency is low, generally only 30%-60%. Switching regulated power supply The power device works in the switching state, and the conversion efficiency can reach 70%-95%. [0003] According to the load's different requirements on...

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Problems solved by technology

[0004] The intelligent drilling tool powered by mud turbine generator has the characteristics of large fluctuations in drilling fluid flow, wide fluctuation range of AC voltage generated by mud turbine generator, and large load power. The use of flyback switching power supply technology can achieve stable DC power output, but a single regulated power supply can only obtain power output of about 50W, which cannot meet the needs of high-power loads. The excitation switching regulated power supply is connected in parallel to obtain a larger output power, enhance the load-carrying ability of intelligent drilling tools, and improve the stability and safety of tools when they work underground, which has important theoretical significance and application value.

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