Digital DC coulometer

A kind of electricity meter, digital technology, applied in the field of single chip technology application and electricity measuring instrument, can solve the problems of small range, complicated debugging, low precision, etc., to achieve the effect of helping the remaining electricity

Inactive Publication Date: 2007-02-28
福建省福州电业局
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0002] At present, the known analog DC fuel gauge is generally implemented by an integrating circuit, which is complicated to debug and has low precision.
Digital DC fuel gauge, for example, MAXIM company of the United States uses semiconductor integrated manufacturing technology to integrate voltage-frequency converter (VFC) and other devices on a chip (such as DS2770) to realize the measurement of power, which is used for batteries for handheld wireless devices power indicator, but the range is small

Method used

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Examples

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Embodiment Construction

[0013] The present invention consists of a current sampling circuit with direction discrimination 1, a voltage-frequency converter (VFC) 2, a single-chip microcomputer (MCU) 3, an 8-bit LED display (LED×8) for current I and electric quantity Q value 4, software monitoring and data memory (X25C45) 5 and power supply circuit 6 constitute.

[0014] Before use, set the P1.7 leg of the MCU to low level, use a certain current (such as 30.00A) to pass through R, and the fuel gauge enters the automatic calibration state, and the MCU software programming completes the current calibration parameter Ki and power calibration parameter Kq. Measure and calculate, and store the results in the Flash ROM X25C45, and make the LED flash to indicate the end of the calibration.

[0015] After completing the software calibration, set the P1.7 leg to high level, connect the fuel gauge to the charging (discharging) circuit, enter the use state, and continuously measure the charging (discharging) curr...

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Abstract

The invention relates to a digit direct-current electricity meter based on voltage-frequency converter (VFC) and single chip computer, wherein it is characterized in that: the tested current is converted into voltage signal to be sent to VFC; MCU tests the frequency and accumulates accounts the frequency f signal of VFC, via digit calculation, to obtain and display tested current and electricity value real time. The invention can be used in discharge and charge managements of large-capacity accumulator, to avoid over charging and discharging and evaluate the left electricity of accumulator. The invention has simple structure and low cost.

Description

technical field [0001] The patent of the invention belongs to the field of single-chip microcomputer technology application and electric measuring instrument, and relates to the digital measurement technology of charging or discharging current and electric quantity of storage battery packs used in electric power and other industries. Background technique [0002] At present, the known analog DC fuel gauge is generally realized by an integrating circuit, and the debugging is complicated and the precision is low. Digital DC fuel gauge, for example, MAXIM company of the United States uses semiconductor integrated manufacturing technology to integrate voltage-frequency converter (VFC) and other devices on a chip (such as DS2770) to realize the measurement of power, which is used for batteries for handheld wireless devices The power indicator, but the range is small. Contents of the invention [0003] In order to overcome the problems existing in the above-mentioned prior art,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
Inventor 叶丹
Owner 福建省福州电业局
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