Device for detecting storage battery through timing discharge under PWM (pulse width modulation) control

Abstract

The invention discloses a device for detecting a storage battery through timing discharge under PWM (pulse width modulation) control. The device comprises a DSP (digital signal processor), a PWM high-frequency signal circuit, a PWM low-frequency signal circuit, an on-off logic judgment circuit, an electromagnetic isolation circuit, an FET (field effect transistor) discharge circuit, a set current analog output circuit and a discharge current detection feedback circuit. According to the device, the DSP is utilized to emit high-precision PWM signals, meanwhile, fast on-off of multiple groups of FETs are controlled, so that the storage battery realizes output of constant current close to short circuit current instantaneously, and the performance condition of the storage battery is judged through rapid detection for a current peak and attenuation change by the DSP. The device can detect the storage battery at any stage in the life cycle, and with the adoption of the DSP, PWM control signal precision and current detection precision both guarantee accuracy of a detection result and universality of a detection range. Due to extreme short conduction time, little heat is generated, and repeated continuous detection can be realized.

Description

technical field [0001] The invention relates to a solar storage battery in the railway industry, in particular to a detection device for a storage battery with PWM-controlled timing discharge. Background technique [0002] At present, the method that is widely used in the railway industry to judge whether the battery is good or bad is to use a traditional discharge instrument to discharge the battery, and at room temperature to measure the attenuation value of the battery voltage at a value less than the rated cold starting current value after a long period of discharge to calculate the battery voltage. The current actual capacity, so as to determine the quality of the battery. This traditional detection method has the following disadvantages: [0003] 1. The battery to be tested must be fully charged. If the test object has been partially discharged, it will inevitably lead to a low measured voltage value, resulting in misjudgment; [0004] 2. For the same battery, it can...

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Problems solved by technology

[0003] 1. The battery to be tested must be fully charged. If the test object has been partially discharged, it will inevitably lead to a low measured voltage value, resulting in misjudgment;

[0004] 2. For the same battery, it cannot be measured multiple times in a short period of time. After a measurement, it takes a long time to charge before it can be measured again. The measurement efficiency is low and the accuracy is poor;

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