KR100224646B1 - Multi-channel battery testing apparatus - Google Patents

Abstract

A multipath battery test apparatus according to the present invention is provided. In the multipath battery test apparatus according to the present invention, a voltage and current setting unit for inputting and converting voltage and current data set from a computer interface unit, a first microcontroller, and the first microcontroller into an analog signal, and adjusting a constant voltage and a constant current And a voltage and current measuring unit, wherein the voltage and current setting unit comprises: a second micro controller which inputs a control signal and data from the first micro controller and outputs a path selection control signal, a first control signal and data; A digital / analog converter for converting data output from the second microcontroller into an analog signal according to the first control signal, and outputting a signal output from the digital / analog converter to a corresponding output terminal according to the path selection control signal Analog multiplexer and above Including a plurality of charging means connected to the output terminal to maintain the voltage output from each output terminal of the analog multiplexer, manufacturing cost is reduced, the size of hardware can be reduced, the number of elements is reduced, so the interference between the elements can be reduced Malfunction of the device can be prevented and noise can be reduced, so that accurate measurement is possible and power consumption is reduced.

Description

Multipath battery test device

TECHNICAL FIELD The present invention relates to a battery test apparatus, and more particularly, to a multipath battery test apparatus capable of setting voltage and current in a time division manner using one digital / analog converter.

A battery test apparatus is an apparatus for measuring the capacity, efficiency, etc. of a battery by applying a current or voltage to the battery and repeating charging and discharging. Since the battery test process requires a short time from several hours to a few months, a multi-channel battery test system that can measure several batteries at the same time is used. In this case, in order to control voltage and current in a digital manner using a computer, a digital / analog converter that generates voltage or current in proportion to an input digital signal is used.

1 is a block diagram of a general multipath cell test apparatus.

The device shown in FIG. 1 is a multi-path battery test device capable of testing 16 cells 17.1, ..., 17.16, and inputs a voltage and a current to be set from a computer (not shown). , 17.16, a computer interface unit 10 for transferring data related to the state of the state, a microcontroller 11 and a microcontroller 11 for inputting and processing voltage and current data from the computer interface unit 10. Inputs voltage and current data from the voltage and current setting unit 13 and voltage and current setting unit 13 for converting the voltage and current data into analog signals. Voltage and current measuring unit for measuring the state of the constant voltage and constant current adjusting unit (16.1, ..., 16.16), the battery (17.1, ..., 17.16) to maintain a constant voltage and current regardless of the state of 14, the voltage and current measurement unit 14 And a data storage unit 12 for storing data to be output, each unit has a power source is supplied by a power supply (not shown).

The operation of the general multi-path battery test apparatus configured as described above will be described with reference to FIG. 1. When the computer interface unit 10 reads the voltage and current to be set from the computer (not shown), the microcontroller 11 processes this value and outputs the value to the voltage and current setting unit 13 and the voltage and current setting unit 13. Converts the input voltage and current data into an analog signal. Further, the first to sixteenth constant current and constant voltage adjusting units 16.1, ..., 16.16 use a feedback of the operational amplifier to generate a constant current and voltage regardless of the state of the batteries 17.1, ..., 17.16. Have it. The voltage and current measuring unit 14 measures the state of each battery 17.1, ..., 17.16 and converts the measured value into digital data using an analog / digital converter. Data related to the state of the battery output from the voltage and current measuring unit 14 is stored in the data storage unit 12, and when the computer requests data, the microcontroller 11 stores the battery state data stored in the data storage unit 12 To the computer via the computer interface unit 10.

2 is a detailed block diagram showing a conventional voltage and current setting unit 13.

The conventional voltage and current setting unit shown in FIG. 2 inputs digital data according to a control signal of the microcontroller 11, converts it into an analog signal, and then outputs it to the corresponding paths D1, ..., D16. Converters 20.1, ..., 20.16 are provided.

Since the conventional voltage and current setting unit installs one digital / analog converter for each path to set the voltage and current, the manufacturing cost is increased and the manufacturing cost is increased because a large number of digital / analog converters corresponding to the number of paths are used. There is a problem that the size is increased and the power consumption is increased.

SUMMARY OF THE INVENTION The present invention has been made in an effort to provide a multipath battery test apparatus capable of setting a voltage and a current in a time division manner using one digital / analog converter.

1 is a block diagram illustrating a general multipath battery test apparatus.

2 is a block diagram illustrating a conventional voltage and current setting unit.

3 is a block diagram showing a multi-path battery test apparatus according to the present invention.

FIG. 4 is a timing diagram for describing an operation of the apparatus shown in FIG. 3.

Explanation of symbols for the main parts of the drawings

30, computer interface unit,

32 first microcontroller,

34 ... voltage and current setting section,

36.1 to 36.16 ... 1st to 16th constant current and constant voltage setting unit,

38 ... voltage and current measurement unit,

B1-B16 ... 1st-16th battery.

In order to achieve the above object, the multi-path battery test apparatus according to the present invention comprises: a computer interface unit for inputting voltage and current data to be set from a computer and transmitting data related to the state of each battery to the computer; A first microcontroller configured to input and process the voltage and current data to be set from the computer interface unit and to output data related to the battery state stored in an internal memory to the computer interface unit; A voltage and current setting unit for inputting the set voltage and current data from the first micro controller and converting the voltage and current data into an analog signal; A constant voltage and constant current controller for inputting a voltage and current signal output from the voltage and current setting unit to maintain a constant voltage and current regardless of the state of the battery; And a voltage and current measuring unit configured to measure the state of each battery and output the battery state data, wherein the voltage and current setting unit inputs a control signal and data from the first microcontroller to generate a path selection control signal and a first signal. A second microcontroller for outputting control signals and data; A digital / analog converter for converting data output from the second microcontroller into an analog signal according to the first control signal; An analog multiplexer for outputting a signal output from the digital / analog converter to a corresponding output terminal according to the path selection control signal; And a plurality of charging means connected to the output terminal to maintain the voltage output from each output terminal of the analog multiplexer.

The charging means preferably comprises a resistor and a capacitor connected between the resistor and the ground.

The constant voltage and constant current adjusting unit preferably includes an operational amplifier using a feedback having a high input resistance state in order not to affect the voltage of the charging means.

It is preferable that the second microcontroller continuously sets the voltages of the respective paths at regular intervals in order to maintain the voltage of the charging means.

The voltage and current measuring unit may include a first analog multiplexer for selectively inputting and outputting a voltage and a current output from one pole of a battery in a corresponding path according to the path selection control signal of the second micro controller, and the second micro controller. A second analog multiplexer for selectively inputting and outputting a voltage and a current output from a second electrode of a battery in a corresponding path according to the path selection control signal of a controller; an output of the first analog multiplexer and an output of the second analog multiplexer A differential amplifier for outputting a difference of output voltages of the first operational amplifier and the second operational amplifier, the first operational amplifier and the second operational amplifier, respectively, and the differential according to the second control signal of the second microcontroller; The output voltage signal of the amplifier or the second operational amplifier And it converts the output current signal into a digital data preferably includes a multi-channel analogue / digital converter for outputting to the second microcontroller.

Hereinafter, exemplary embodiments of a multi-path battery test apparatus according to the present invention will be described with reference to the accompanying drawings.

3 illustrates a multi-path battery test apparatus according to the present invention, and FIG. 4 illustrates a timing diagram for describing an operation of the voltage and current setting unit illustrated in FIG. 3.

The apparatus shown in FIG. 3 is a multi-path battery test apparatus capable of testing 16 batteries B1, ..., B16, and inputs voltage and current data to be set from a computer, and each battery (B1, ..., B16). The computer interface unit 30 for transferring data related to the state of B16) to the computer, the voltage and current data to be set from the computer interface unit 30 are input and processed, and the data related to the battery state stored in the built-in memory is processed. A first microcontroller 32 for outputting to the unit 30, a voltage and current setting unit 34 for inputting voltage and current data to be set from the first microcontroller 32 and converting the analog signal into an analog signal; Constant voltage and constant current adjusting units 36.1, ..., for inputting voltage and current signals output from the current setting unit 34 to maintain a constant voltage and current regardless of the state of the battery. 36.16) and a voltage and current measuring unit 38 for measuring the state of each battery B1, ..., B16 and outputting battery state data.

The voltage and current setting unit 34 inputs a control signal CS1 and data from the first microcontroller 32 to route selection control signals S1, S2, SS3, and S4 and the first control signal CS2. , The second microcontroller 340 for outputting the second control signal CS3 and data, and the digital / analog for converting the data output from the second microcontroller 340 into an analog signal according to the first control signal CS2. An analog multiplexer for outputting signals output from the converter 342 and the digital / analog converter 342 to the corresponding output terminals T1, ..., T16 according to the path selection control signals S1, S2, SS3, S4 ( 344 and the first to sixteenth resistors R1 and R16 connected to the output terminals T1, ..., and T16 to maintain the voltages output from the respective output terminals T1, ..., and T16 of the analog multiplexer 344. ..., R16 and first through sixteenth capacitances connected between the first through sixteenth resistors R1, ..., R16 and ground. And a (C1, ..., C16).

In addition, the first constant voltage and constant current adjuster 36.1 may adjust the resistors R20.1, R21.1, and R22.1 and the capacitor C20.1 in order not to affect the voltage of the first capacitor C1. And a first operational amplifier OP1 using a feedback having a high input resistance state. The second to sixteenth constant voltage and constant current adjusting units 36.2, ..., 36.16 also have the above-described configuration.

In addition, the voltage and current measuring unit 38 selectively selects the voltage and current output from the first electrode of the battery in the corresponding path according to the path selection control signals S1, S2, SS3, and S4 of the second microcontroller 340. Voltage and current output from the other electrode of the battery in the corresponding path according to the path selection control signals S1, S2, SS3, S4 of the first analog multiplexer 380 and the second microcontroller 340 A second analog multiplexer 382 and an operational amplifier OP17 and OP18 connected to an output of the first analog multiplexer 380 and an output of the second analog multiplexer 382, respectively, for selectively inputting and outputting According to the differential amplifier OP19 having the resistors R25, R26, R27, and R28 and the second control signal CS3 of the second microcontroller 340 to output the output voltage difference of the amplifiers OP17 and OP18. Output voltage scene of differential amplifier (OP19) A multi-channel analog / digital converter 384 is provided for converting the output current signal of the call or operational amplifier OP18 into digital data and outputting it to the second microcontroller 340.

The operation of the multi-path battery test apparatus according to the present invention configured as described above will be described with reference to FIGS. 3 and 4.

The multipath cell test apparatus of FIG. 3 uses a second digital controller 340 and an analog multiplexer 344 to set the voltage and current to each cell in a time division manner, thereby using a single digital to analog converter 342. A device that can test the voltage and current of a battery.

When a current or voltage value to be set in the first battery B1 is input to the first microcontroller 32 as digital data through the computer interface unit 30, the first microcontroller 32 inputs this data to digital / The analog-to-analog converter 342 outputs the digital / analog converter 342 to convert the input data as shown in FIG. 4 (a) into an analog signal as shown in FIG. 4 (b) according to the first control signal CS2. Output The output signal of the digital / analog converter 342 is input to the analog multiplexer 344 and according to the path selection control signals S1, S2, S3, and S4, the first output terminal T1 as shown in FIG. ) The voltage output to the first output terminal T1 is maintained at the voltage of the first capacitor as shown in FIG. If the first resistor R1 is 470 Ω and the first capacitor C1 is 0.1 ㎌, since the time constant is 47 ㎲, it is charged to 99.9999% for 1 ms.

Thereafter, an enable signal such as (f) of FIG. 4 is applied to the analog multiplexer 344 to make the output terminal of the analog multiplexer 344 high-resistance state, and as shown in FIG. The current or voltage value to be set in the battery B2 is output for 1 ms to the second output terminal T2 through the analog multiplexer 344 in the same manner as described above, and the second capacitor C2 as shown in FIG. To store the voltage. The current or voltage values for the remaining batteries B3 to B16 are also output to the remaining output terminals T3 to T16 for 1 ms as described above to store the voltage in each capacitor C3 to C16.

The above process is repeated to prevent the voltage from being lowered due to the leakage current of the capacitor. In addition, the constant current and constant voltage controllers 36.1 to 36.16 connected to the rear stages have a very large input resistance by the feedback of the operational amplifier OP1, and thus do not affect the voltage charged in the capacitor.

Therefore, the voltage and current of each battery can be set accurately by only one digital / analog converter by the time division method.

On the other hand, the operation of the voltage and current measuring unit 38 is as follows. The first analog multiplexer 380 selectively inputs and outputs a voltage and current output from one pole of a battery in a corresponding path according to the path selection control signals S1, S2, SS3, and S4 of the second microcontroller 340. In addition, the second analog multiplexer 382 selectively inputs a voltage and a current output from the other electrode of the battery in the corresponding path according to the path selection control signals S1, S2, SS3, and S4 of the second microcontroller 340. To print. Each output of the operational amplifiers OP17 and OP18 connected to the output of the first analog multiplexer 380 and the output of the second analog multiplexer 382, respectively, has a differential amplifier having resistors R25, R26, R27, and R28. It is input to OP19 and the difference value is output from the differential amplifier OP19. The multi-channel analog / digital converter 384 converts the output voltage signal of the differential amplifier OP19 or the output current signal of the operational amplifier OP18 into digital data according to the second control signal CS3 of the second microcontroller 340. The converted signal is output to the second microcontroller 340.

On the other hand, the second microcontroller 340 transmits the state data of the battery to the first microcontroller 32, and when there is a battery state data request from the computer, the first microcontroller 32 is the state of the battery stored in the memory The data is transmitted to the computer through the computer interface unit 10.

As described above, the multi-path battery test apparatus according to the present invention uses one digital-to-analog converter for voltage and current setting regardless of the number of paths, thereby reducing manufacturing costs, reducing the size of hardware, and reducing the number of elements. The interference between the devices can be reduced to prevent malfunction of the device, and the noise can be reduced, so that accurate measurement is possible and power consumption is reduced.

Claims (5)

A computer interface unit for inputting voltage and current data to be set from a computer and transmitting data related to the state of each battery to the computer; A first microcontroller configured to input and process the voltage and current data to be set from the computer interface unit and to output data related to the battery state stored in an internal memory to the computer interface unit; A voltage and current setting unit for inputting the set voltage and current data from the first micro controller and converting the voltage and current data into an analog signal; A constant voltage and constant current controller for inputting a voltage and current signal output from the voltage and current setting unit to maintain a constant voltage and current regardless of the state of the battery; And It is provided with a voltage and current measuring unit for measuring the state of each battery to output the battery state data, The voltage and current setting unit, A second microcontroller for inputting a control signal and data from the first microcontroller to output a path selection control signal, a first control signal and data; A digital / analog converter for converting data output from the second microcontroller into an analog signal according to the first control signal; An analog multiplexer for outputting a signal output from the digital / analog converter to a corresponding output terminal according to the path selection control signal; And And a plurality of charging means connected to said output terminal to maintain a voltage output at each output terminal of said analog multiplexer. The multipath battery test apparatus according to claim 1, wherein the charging means includes a resistor and a capacitor connected between the resistor and the ground. The multi-path battery test apparatus according to claim 1, wherein the constant voltage and constant current adjusting unit includes an operational amplifier using a feedback having a high input resistance state so as not to affect the voltage of the charging means. The multi-path battery test apparatus according to claim 1, wherein the second micro controller continuously sets the voltages of the respective paths at regular intervals to maintain the voltage of the charging means. The method of claim 1, wherein the voltage and current measuring unit, A first analog multiplexer for selectively inputting and outputting a voltage and a current output from one pole of a battery in a corresponding path according to the path selection control signal of the second microcontroller; A second analog multiplexer for selectively inputting and outputting a voltage and a current output from a second electrode of a battery in a corresponding path according to the path selection control signal of the second microcontroller; A first operational amplifier and a second operational amplifier connected to an output of the first analog multiplexer and an output of the second analog multiplexer, respectively; A differential amplifier configured to output an output voltage difference between the first operational amplifier and the second operational amplifier; And A multi-channel analog / digital converter for converting the output voltage signal of the differential amplifier or the output current signal of the second operational amplifier into digital data according to the second control signal of the second microcontroller to output to the second microcontroller Multi-path battery test apparatus comprising a.

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