Voltage transducer
Described herein are exemplary systems and methods with a high common mode voltage rating for monitoring a battery system by converting a differential channel output to a single channel output with low error. The exemplary systems and methods described herein comprise a measurement system and a data acquisition system, wherein the measurement system is configured to acquire a plurality of data input measurements and consecutively transmit each respective data input measurement signal to the data acquisition system, and the data acquisition system is configured to determine an average voltage corresponding to each respective data input measurement signal and generate an output.
1 . A battery monitoring system comprising:
a plurality of measurement devices in electrical communication with one or more multiplexers and a computer; and
one or more resistor dividers in electrical communication with the plurality of measurement devices, multiplexer, and computer,
wherein the system is configured to:
receive, by each of the plurality of measurement devices, a respective analog input signal of a plurality of analog input signals, wherein a resistor divider of the one or more resistor dividers is configured to reduce the voltage of a respective analog input signal prior to receipt of the analog signal by a measurement device of the plurality of measurement devices, and wherein a resistance of the resistor divider is automatically increased based on the voltage of the analog input signal measured by a measurement device of the plurality of measurement devices surpassing a threshold voltage, wherein the threshold voltage is less than the measurement device common mode voltage,
measure, by each of the plurality of measurement devices, a respective analog voltage for each respective analog input signal of the plurality of analog input signals, and
transmit, by each of the plurality of measurement devices, a respective analog voltage measurement signal to a multiplexer of the one or more multiplexers,
consecutively transmit, from the multiplexer to the computer, each respective analog voltage measurement signal of a plurality of analog voltage measurement signals;
convert, by the computer, each respective analog voltage measurement signal received from the multiplexer to a respective digital signal;
determine, by the computer, a respective average voltage for each respective digital signal.
2 . The battery monitoring system of claim 1 , wherein the system is further configured to generate an output.
3 . The battery monitoring system of claim 2 , wherein the output comprises a display indicating the status of a battery.
4 . The battery monitoring system of claim 2 , wherein the output comprises a control signal for controlling one or more battery modules by switching the one or more battery modules on or off at a predefined switching rate.
5 . The battery monitoring system of claim 4 , wherein the predefined switching rate any one of 0.1 kHz, 0.2 kHz, 0.3 kHz, 0.4 kHz, 0.5 kHz, 0.6 kHz, 0.7 kHz, 0.8 kHz, 0.9 kHz or 1.0 kHz.
6 . The battery monitoring system of claim 1 , wherein each respective analog voltage measurement signal of the plurality of analog voltage measurement signals is transmitted from the multiplexer to the computer in a predefined order, wherein the predefined order is configurable by a user of the system.
7 . The battery monitoring system of claim 1 , wherein an analog input signal of the plurality of analog input signals is any one of a temperature, a strain, a current, a pressure or a differential channel output from a battery cell.
8 . The battery monitoring system of claim 1 , wherein a resistor divider of the one or more resistor dividers is configured to reduce the voltage of a respective analog voltage measurement signal transmitted by a measurement device of the plurality of measurement devices to the multiplexer to less than or equal to 1.8V.
9 . The battery monitoring system of claim 1 , wherein a resistance of the one or more resistor dividers is changed based on a signal from the computer using a potentiometer.
10 . The battery monitoring system of claim 1 , wherein a buffer is configured to reduce a current of an analog voltage measurement signal prior to receipt of the analog voltage measurement signal by the multiplexer.
11 . The battery monitoring system of claim 1 , wherein each analog input signal is any battery parameter that can be converted to a raw voltage output.
12 . The battery monitoring system of claim 1 , wherein a measurement device of the plurality of measurement devices measurement device has a common mode voltage rating of at least +/−200V.
13 . The battery monitoring system of claim 1 , wherein the average voltage is determined based on at least 50, 100, or 150 voltage measurement data points.
14 . The battery monitoring system of claim 1 , wherein the average voltage is determined based on a plurality of voltage measurement data points acquired over a duration of at least 2, 5, or 7 seconds.
15 . The battery monitoring system of claim 1 , wherein a multiplexer of the one or more multiplexers is any one of a 2 to 1 multiplexer, a 4 to 1 multiplexer, an 8 to 1 multiplexer, a 16 to 1 multiplexer, or a 24 to 1 multiplexer.
16 . A non-transitory computer readable storage medium storing one or more programs for monitoring a battery system, the one or more programs configured to be executed by one or more computers and including instructions for:
receiving, by each of a plurality of measurement devices, a respective analog input signal of a plurality of analog input signals, wherein one or more resistor dividers are in electrical communication with the plurality of measurement devices, and wherein a resistor divider of the one or more resistor dividers is configured to reduce the voltage of a respective analog input signal prior to receipt of the analog signal by a measurement device of the plurality of measurement devices, and wherein a resistance of the resistor divider is automatically increased based on the voltage of the analog input signal measured by a measurement device of the plurality of measurement devices surpassing a threshold voltage, wherein the threshold voltage is less than the measurement device common mode voltage;
measuring, by each of the plurality of measurement devices, a respective analog voltage for each respective analog input signal of the plurality of analog input signals;
transmitting, by each of the plurality of measurement devices, a respective analog voltage measurement signal to one or more multiplexers;
consecutively transmitting, from the one or more multiplexers to a computer, each respective analog voltage measurement signal of the plurality of analog voltage measurement signals;
converting, by the computer, each respective voltage measurement signal received from the multiplexer to a respective digital signal; and
determining, by the computer, a respective average voltage for each respective digital signal.
17 . A method for determining an average voltage of a digital signal corresponding to an analog signal, the method comprising:
receiving, by each of a plurality of measurement devices, a respective analog input signal of a plurality of analog input signals, wherein one or more resistor dividers are in electrical communication with the plurality of measurement devices, and wherein a resistor divider of the one or more resistor dividers is configured to reduce the voltage of a respective analog input signal prior to receipt of the analog signal by a measurement device of the plurality of measurement devices, and wherein a resistance of the resistor divider is automatically increased based on the voltage of the analog input signal measured by a measurement device of the plurality of measurement devices surpassing a threshold voltage, wherein the threshold voltage is less than the measurement device common mode voltage;
measuring, by each of the plurality of measurement devices, a respective analog voltage for each respective analog input signal of the plurality of analog input signals;
transmitting, by each of the plurality of measurement devices, a respective analog voltage measurement signal to one or more multiplexers;
consecutively transmitting, from the one or more multiplexers to a computer, each respective analog voltage measurement signal of a plurality of analog voltage measurement signals;
converting, by the computer, each respective analog voltage measurement signal received from the multiplexer to a respective digital signal; and
determining, by the computer, a respective average voltage for each respective digital signal.