Uninterrupted variable-frequency stabilized-current power supply

Abstract

In order to overcome defects of a stabilized-current power supply used for ground resistivity measurement in industries such as earthquake observation, earthquake engineering and hydrogeology currently, meet the technical requirement that ground resistivity observation is anti-interference and realize needs of AC / DC comparative observation and joint observation, the invention provides an uninterrupted variable-frequency stabilized-current power supply which is designed by using a switching power supply technology and a variable-frequency inverter technology. According to the power supply, sine-wave low-frequency AC stabilized-current power with frequency and current programmable can be outputted for being used by a ground resistivity observation device, or DC stabilized-current power with current programmable can be outputted for being used by the ground resistivity observation device, and 220V / 50Hz AC can be outputted for being used by other power consumption devices. The uninterrupted variable-frequency stabilized-current power supply is mainly composed of a switching stabilized-voltage power circuit, a charging circuit, a variable-frequency stabilized-current inverter circuit, a 220V / 50Hz AC inverter circuit, an AC / DC reference signal generation and control circuit, a battery pack and a working power circuit.

Description

[0001] Technical field [0002] The invention relates to a steady-current power supply adopting switching power supply technology and frequency conversion inverter technology, in particular, it can output not only low-frequency alternating current steady-current power, but also direct-current steady-current power, and uninterrupted frequency conversion capable of outputting 220V, 50HZ alternating current AC steady current power supply. [0003] technical background [0004] At present, in my country's earthquake observation, earthquake engineering, hydrogeology and other industries, the steady-current power supply used for ground resistivity measurement generally adopts a DC steady-current power supply. Since the DC ground resistivity observation system is easily affected by electrified railways, industrial or other stray currents, the anti-interference ability is relatively poor; if a variable frequency AC steady current power supply is used for ground resistivity observation,...

AI Technical Summary

Problems solved by technology

Since the DC ground resistivity observation system is easily affected by electrified railways, industrial or other stray currents, the anti-interference ability is relatively poor; if a variable frequency AC steady current power supply is used for ground resistivity observation, due to the It is a frequency-selective transmission and frequency-selective AC method technology, with a single frequency, so the anti-interference ability will be significantly enhanced; in addition, due to the influence of the earth's surface adhesion effect, different frequencies can be output, and the ground resistivity of different depths can be measured, which is beneficial to the underground Medium inversion; in some occasions, DC and AC resistivity comparison observations or joint observations are required, so both a variable frequency low-frequency AC steady-current power supply and a DC steady-current power supply are required

In the geological industry, although variable-frequency AC steady-current power supplies are also used, domestic power supplies basically output square-wave variable-frequency power supplies instead of sine-wave variable-frequency power supplies, and the commonly used steady-current power supplies basically do not have uninterrupted functions. , once the mains power is interrupted, a larger power UPS power supply or engine power generation is required to maintain work, which brings a lot of inconvenience to continuous work and field work

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