A storage battery impedance detection device stimulated by spwm signal generated by single chip microcomputer

Abstract

The invention relates to a storage battery impedance detection device excited by a SPWM signal generated by a single-chip microcomputer, and relates to a four-wire detection device for the internal resistance of a sealed valve-regulated lead-acid battery. One wire is connected to the voltage detection device to form a voltage sampling circuit, and the other two wires are connected to a current constant current source to form a current injection circuit. The excitation signal comes from the SPWM signal generated by the microcontroller through programming, and the modulation frequency of the SPWM excitation signal It can be adjusted according to the actual measurement situation. The invention obtains sinusoidal excitation signals of different frequencies through the SPWM modulation method to measure the internal impedance distribution of the sealed valve-regulated lead-acid battery VRLA, and can comprehensively grasp the internal resistance of the sealed valve-regulated lead-acid battery VRLA in the working state of the sealed valve-regulated lead-acid battery. line detection device.

Description

technical field [0001] The invention relates to the field of storage batteries, in particular to a battery internal impedance detection device. Background technique [0002] In the fields of power generation, power supply, and communication, series-connected sealed valve-regulated lead-acid batteries VRLA are used as backup power sources. When the AC power supply fails, the backup power supply must immediately provide uninterrupted power supply to ensure the normal operation of the entire system. Therefore, judging the quality of the power supply capacity of the battery pack is very important for the reliability and safety of the above-mentioned fields. Since the VRLA storage battery is fully sealed, it is impossible to detect its internal materials with an intuitive method. By detecting the impedance of the battery, you can better judge its power supply capacity. It is generally believed that when the impedance of the battery is greater than 25% of the reference value of ...

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Problems solved by technology

[0020] The existing internal resistance tester products all use a single frequency ranging from 10Hz to 1000Hz as the AC excitation current, instead of using continuous frequency or several frequency points as the excitation frequency, and are limited to the measurement of internal resistance, without The internal impedance of the sealed valve-regulated lead-acid battery VRLA is measured, and the internal characteristics of the sealed valve-regulated lead-acid battery VRLA obtained are incomplete.

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