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Inverter of voltage polarity, detecting circuit and method of charge and discharge current of battery

A technology for changing the polarity of circuits and voltages. It is applied in the directions of measuring electrical variables, measuring current/voltage, and measuring electricity. It can solve the problems of increasing the complexity of detection circuits and product costs, and achieves easy design and production, cost control, and simple circuits. Effect

Inactive Publication Date: 2007-05-30
BYD CO LTD
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Problems solved by technology

[0004] Although the above detection circuit can complete the voltage detection by using two ADCs, this will undoubtedly greatly increase the complexity of the detection circuit and the cost of the product

Method used

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  • Inverter of voltage polarity, detecting circuit and method of charge and discharge current of battery
  • Inverter of voltage polarity, detecting circuit and method of charge and discharge current of battery

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specific Embodiment approach

[0032] It can be seen from a specific implementation circuit and theoretical analysis above that the present invention is not limited to the above-mentioned specific implementation, as long as the detection method of the battery charge and discharge current meets the following conditions, the purpose of the present invention can be achieved, and it also belongs to the content of the present invention :

[0033] A method for detecting battery charging and discharging current, comprising the steps of:

[0034] a. Sampling the voltage Vin of the battery to be measured;

[0035] b. Select an appropriate reference source voltage AREF according to the positive and negative value range of the voltage Vin to be measured. The relationship between AREF and the voltage Vin to be measured satisfies: (AREF*R2+Vin*R1) / (R1+R2)>0;

[0036] c. Send the voltage at the middle point of the superimposed resistors R1 and R2 as a sampling voltage to the microprocessor or digital signal processing ...

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Abstract

A voltage polarity conversion circuit is disclosed that can convert the bipolar voltage of the input to unipolar voltage signal. It comprises reference source, diverder resistance R1,R2,input terminal Vin,output terminal Vout. The reference source provides constant output; the voltage is divided by the diverder resistance R2, and superposed to the input voltage VIN to be the output Vout. The circuit can realize the conversion of the bipolar voltage to the unipolar voltage signal, but also lift the tiny voltage signal to fulfill the processing requirement of the rear end components. The battery charging and discharging current detecting circuit can be constructed just by connecting the output of the voltage polarity conversion circuit Vout with microprocessor or digit signal process chip.

Description

【Technical field】 [0001] The invention relates to a battery charge and discharge current detection circuit, in particular to a battery charge and discharge current detection circuit using a voltage polarity conversion circuit capable of converting bipolar voltages into unipolar voltage signals. 【Background technique】 [0002] The current development of electronic products towards miniaturization and integration requires the most functions to be packed into the least space, which directly leads to the emergence of smart batteries. A smart battery refers to a battery with certain logic, which must have the function of reporting its own charging / discharging current. [0003] The detection of battery charging / discharging current is generally calculated by detecting the voltage on a known resistance resistor. Since the current flow through the resistor is different during charging and discharging, the voltage signal detected on the resistor will appear positive and negative. Th...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36G01R19/00
Inventor 刘彦和皇攀学郭海涛
Owner BYD CO LTD
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