Micro-resistance test system based on four-wire method and digital anti-interference circuit
A test system, four-wire method technology, applied in the direction of measuring resistance/reactance/impedance, measuring electricity, measuring devices, etc., can solve the problems of internal resistance tester volume and power consumption that cannot meet the requirements, power increase, etc. Effects of digital chip integration, increased power consumption, and reduced coupling effects
Active Publication Date: 2020-09-29
CHONGQING SOUTHWEST INTEGRATED CIRCUIT DESIGN
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Problems solved by technology
The internal resistance tester using the digital solution on the market requires a higher AD sampling frequency in order to ensure the accuracy of the measurement. If the AD sampling frequency is increased, the power will be increased accordingly.
The actual application of the battery mainly adopts a series-parallel structure of multiple batteries. If each battery module is tested online, the size and power consumption of the internal resistance tester cannot meet the requirements. There is no mature solution on the market at this stage.
Method used
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Embodiment 2
[0091] Embodiment 2, a kind of micro-resistance test system based on four-wire method, comprising operational amplifier 1, analog filter 2, A / D conversion circuit 3, V / I converter 12, D / A conversion circuit 11, cosine table 10 And a digital anti-jamming circuit; said digital anti-jamming circuit includes an addition counter 9, a phase shifter 8, a multiplier 7 and an integrating circuit 6;
[0092] The addition counter 9 is used to generate a periodic ramp signal stepping into one according to the sampling clock frequency of the A / D conversion circuit 3, and outputs it to the cosine table 10 as an address signal of the cosine table 10; simultaneously, the periodic ramp signal is output to the phase shifter 6 ;
[0093] Cosine table 10 is used for generating digital sine wave signal by look-up table mode, output to D / A conversion circuit 11;
[0094] The D / A conversion circuit 11 performs digital-to-analog conversion on the received signal, and outputs it to the V / I converter ...
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The invention discloses a micro-resistance test system based on a four-wire method and a digital anti-interference circuit. The digital anti-interference circuit comprises an addition counter, a phaseshifter, a multiplier and an integrating circuit; and is characterized in that the addition counter generates a periodic slope signal with one stepping according to a sampling clock frequency and outputs the periodic slope signal to the phase shifter; the phase shifter is used for outputting a reference signal to the multiplier; the phase shifter selects two signal values with a phase differenceof 180 degrees as a preset digital value according to the periodic slope signal output by the addition counter, and the preset digital value is between the maximum value and the minimum value of the periodic slope signal; when the periodic slope signal output by the addition counter reaches a preset digital value, output of the phase shifter is overturned; the preset digital value is adjusted to adjust the phase of the reference signal; and the multiplier performs product operation on the reference signal and a voltage signal acquired on line and outputs the product signal to the integrating circuit. The system and circuit are suitable for online testing of the internal resistance of various batteries.
Description
technical field [0001] The invention relates to battery testing, in particular to a micro-resistance testing system and a digital anti-jamming circuit based on a four-wire method. Background technique [0002] Under normal circumstances, the more electricity stored in the battery, the smaller the internal resistance, and vice versa. In addition, the battery will deteriorate after long-term use. When the battery is charged to the same voltage, the internal resistance of the deteriorated battery is greater than that of the normal battery, and the battery capacity will decrease accordingly. SoH is usually used to describe the degree of battery deterioration, which is the ratio of the measured capacity to the nominal capacity, and represents the aging degree of the battery. By comparing the internal resistance of the entire battery pack, it is possible to find out which batteries have deteriorated in the battery pack. When the internal resistance value increases by more than 2...
Claims
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IPC IPC(8): G01R31/389G01R27/08
CPCG01R31/389G01R27/08
Inventor苏良勇范麟戚园
OwnerCHONGQING SOUTHWEST INTEGRATED CIRCUIT DESIGN