Acquisition circuit and method for improving acquisition precision of temperature sensor
A technology of temperature sensor and acquisition method, which is applied to thermometers, thermometers using electrical devices, and thermometers using directly heat-sensitive electric/magnetic elements, etc., which can solve the problems of loose connection wires, thermal runaway, and loose faults of temperature-sensing connection wires, etc. problems, to achieve the effect of eliminating impedance factors, improving temperature acquisition accuracy, and avoiding charging fire or thermal runaway
Active Publication Date: 2021-09-24
力高(山东)新能源技术股份有限公司
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[0002] As one of the core components of electric vehicles, the battery management system (BMS) has always been the focus of electric vehicle research and development; in the BMS system, the temperature sensor is generally used to collect the temperature of the charging socket or the temperature of the coolant inlet and outlet for thermal management, but During the long-term use of the connector and wiring harness connected to the temperature sensor, factors such as vibration, aging, condensation, etc. will likely appear: cause the temperature sensor connection line to loosen and fail: when the connection line is loose and faulty, it is equivalent to the temperature sensor acquisition line The impedance above becomes larger, and the extra impedance will be superimposed on the calculation result of the NTC's tem
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[0027] The present application will be further described in connection with the accompanying drawings, and it is necessary to indicate that the following detailed descriptions are intended to be further described herein, and cannot be understood as limiting the scope of the present application, those skilled in the art can The above-described application has made some non-essential improvements and adjustments to this application.
[0028] like Figure 1 to 3 An acquisition circuit and method showing a temperature sensor acquisition accuracy,
[0029] BMS as a new energy vehicle power battery management system a very important function is to collect temperatures, and the temperature in the prior art uses thermistor NTC to collect, such as figure 1 The existing acquisition loop block diagram shows that the calculation formula of the corresponding RNTC is: RNTC = (VDD * R1) / (VDD-VAD) measured the RNTC value after the RT table (thermistor resistance value) is queried by querying NTC...
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The invention relates to an acquisition circuit and method for improving acquisition precision of a temperature sensor. The acquisition circuit comprises a thermistor Rntc, an impedance Rx of a temperature sensing acquisition line and a pull-up resistor R1 which are sequentially connected in series between a grounding end GND and a power supply voltage end VDD; the VAD end is used for acquiring an AD voltage value Vad of the CPU end, and the end part of the VAD end is connected between the impedance Rx of the temperature sensing acquisition line and the pull-up resistor R1; a resistor R2 is connected with the two ends of the thermistor Rntc in parallel; a switch S1 is used for controlling the on-off of a branch circuit where the resistor R2 is located; the resistance value of the impedance RX of the temperature sensing acquisition line is firstly obtained, and then the accurate resistance value of the thermistor Rntc can be calculated according to the impedance RX of the temperature sensing acquisition line.
Description
technical field [0001] The invention belongs to the field of battery management systems for new energy vehicles, in particular to the field of circuits and methods for improving the acquisition accuracy of temperature sensors. Background technique [0002] As one of the core components of electric vehicles, the Battery Management System (BMS) has always been the focus of electric vehicle research and development; in the BMS system, the temperature sensor is generally used to collect the temperature of the charging socket or the temperature of the coolant inlet and outlet for thermal management, but During the long-term use of the connector and wiring harness connected to the temperature sensor, factors such as vibration, aging, condensation, etc. will likely appear: cause the temperature sensor connection line to loosen and fail: when the connection line is loose and faulty, it is equivalent to the temperature sensor collection line The impedance above becomes larger, and th...
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CPCG01K7/24Y02T10/7072
Inventor 孙艳王翰超王云姜明军刘欢沈永柏江梓贤
Owner 力高(山东)新能源技术股份有限公司
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