A negative power supply circuit and downhole instrument

CN224343096UActive Publication Date: 2026-06-09GUOYI PETROLEUM TECH (WUXI) CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
GUOYI PETROLEUM TECH (WUXI) CO LTD
Filing Date
2025-06-06
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

The transformer losses in existing flyback power supply circuits result in low power efficiency, which cannot meet the power supply requirements of downhole instruments.

Method used

A negative power supply circuit is adopted, including a power regulator chip, a frequency adjustment resistor, an error adjustment module, a voltage divider resistor, a freewheeling diode, an inductor, and a filter capacitor. By setting the resistance value of the frequency adjustment resistor to the target resistance value, the operating frequency of the power regulator chip is minimized. Combined with the error adjustment module, the stability of the output voltage is improved, thus realizing a negative power supply circuit.

Benefits of technology

It improved power conversion efficiency, extended the working time of downhole instruments, met the power requirements of downhole instruments, and improved voltage stability.

✦ Generated by Eureka AI based on patent content.

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    Figure CN224343096U_ABST
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Abstract

The utility model discloses a kind of negative power supply circuit and underground instrument, the circuit includes: power supply voltage stabilizing chip, frequency regulating resistance, error adjusting module, first voltage divider resistance, second voltage divider resistance, freewheeling diode, inductance and first filter capacitor, switch tube is provided between the voltage input pin of power supply voltage stabilizing chip and switch tube power supply pin;The working frequency pin of power supply voltage stabilizing chip is connected with the one end of frequency regulating resistance, and the other end of frequency regulating resistance is connected with output voltage end;The ground pin of power supply voltage stabilizing chip is connected with the anode of freewheeling diode and output voltage end;The switch tube power supply pin of power supply voltage stabilizing chip is connected with the cathode of freewheeling diode and the other end of inductance;The resistance value of frequency regulating resistance is target resistance value, and target resistance value is used to make the working frequency of power supply voltage stabilizing chip be minimum working frequency.The power conversion efficiency of the negative power supply circuit is higher.
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