AD sampling circuit used for pure electric vehicle
A pure electric vehicle and sampling circuit technology, applied in the direction of adjusting electric variables, general control systems, instruments, etc., can solve the problems of increasing the amount of program calculation, increasing the length of the program, system instability, etc., to improve accuracy, easy to implement, The simple effect of the circuit
Active Publication Date: 2013-12-25
深蓝汽车科技有限公司
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Problems solved by technology
[0011] (1) Need to occupy two more sampling channels for reference voltage input;
[0012] (2) Before each AD sampling conversion, it is necessary to calculate the gain coefficient and offset coefficient according to the sampling values of the two reference voltages, which will undoubtedly increase the amount of calculation of the program and increase the length of the program;
[0013] (3) If the occasional AD sampling offset is caused by system instability or hardware problems, the above method cannot solve the problem
Method used
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Embodiment Construction
[0033] The present invention will be further described below in conjunction with accompanying drawing:
[0034] Such as image 3 The shown AD sampling circuit for pure electric vehicles includes a sensor 1, a subtraction circuit 2, a DSP chip, a comparison circuit 6 and a reference voltage circuit 3;
[0035] The DSP chip is the TMS320C28XX series, and the DSP chip includes an AD sampling module 4 and a PWM output module 5; the AD sampling module 4 shown is a 12-bit core with a built-in double sample holder (S / H), and the analog input is required to be at 0 To within 3V, there are 16 channels, multi-channel selection input;
[0036] The output end of described sensor 1 is connected with the input end of subtraction circuit 2, comparison circuit 6 respectively, and the output end of described subtraction circuit 2 is connected with the AD sampling module 4 of DSP chip, and the PWM output module 5 of DSP chip is compared with described The input end of circuit 6 is connected, ...
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The invention discloses an AD sampling circuit used for a pure electric vehicle. The AD sampling circuit comprises a sensor, a subtraction circuit, a DSP chip, a comparison circuit and a reference voltage circuit. The DSP chip comprises an AD sampling module and a PWM output module. The output end of the sensor is respectively connected with the input end of the subtraction circuit and the input end of the comparison circuit, and the output end of the subtraction circuit is connected with the AD sampling module of the DSP chip. The PWM output module of the DSP chip is connected with the input end of the comparison circuit, the output end of the comparison circuit is respectively connected with an IO port of the DSP chip and the input end of the reference voltage circuit, and the output end of the reference voltage circuit is connected with the input end of the subtraction circuit. A gain error and a bias of AD conversion can be reduced, a program is not needed to perform bias calculation too much, and accuracy and timeliness of sampling can be improved.
Description
technical field [0001] The invention belongs to the electric vehicle motor controller technology, in particular to an AD sampling circuit for pure electric vehicles. Background technique [0002] At present, Digital Signal Processing (DSP for short) has become the mainstream of signal processing technology. TMS320 series DSP chips have the characteristics of low price, easy to use, powerful functions, etc., and have become one of the most influential DSP series processors at present. The TMS320 series for digital control and motion control has rich on-chip peripherals, integrated ADC module, 12-bit core, built-in dual sample-and-hold (S / H), 16-channel, multi-channel input, which can meet the requirements of pure electric Acquisition and conversion functions of analog signals such as current and voltage of automobile motor controllers. [0003] Pure electric vehicles are a hot field of research and development, and DSP is increasingly widely used in electric vehicle motor c...
Claims
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IPC IPC(8): G05B19/042G05F1/56
Inventor 万艳宽薛山郝成芳
Owner 深蓝汽车科技有限公司