CN210572648U - Linear control circuit and battery test system - Google Patents
Linear control circuit and battery test system Download PDFInfo
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- CN210572648U CN210572648U CN201920803692.1U CN201920803692U CN210572648U CN 210572648 U CN210572648 U CN 210572648U CN 201920803692 U CN201920803692 U CN 201920803692U CN 210572648 U CN210572648 U CN 210572648U
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Abstract
A linear control circuit and battery test system, the linear control circuit includes inputting the A end of the external control voltage signal, B end and C end of the cut-in external circuit, power tube Q and control chip IC1, IC 2; resistors R1 and R2 which are sequentially connected are connected in series between the end A and the end G of the power tube, a resistor R3 is connected in series between the end B and the end D of the power tube, and a resistor R4 is connected in series between the end C and the end S of the power tube; the IC1 is used for collecting the voltage at two ends of the R3 and outputting a preset compensation voltage to two ends of the R1 when the collected voltage is larger than a preset threshold value; the IC2 is used for collecting the voltage at two ends of the R4, amplifying the collected voltage in an equal ratio and outputting the amplified voltage to two ends of the R2. The battery testing system adopts a structure that a plurality of testing units are connected in parallel, and each testing unit is connected in parallel by a multi-linear control circuit, so that a plurality of power tubes are formed to be interlocked and connected in parallel, high-speed control of current change is realized, voltage testing precision is improved, and accurate testing of battery capacity is ensured.
Description
Technical Field
The invention relates to the field of lithium ion battery testing, in particular to a linear control circuit and a battery testing system.
Background
The battery test system in the existing market mainly adopts a field effect transistor as a low-power test system of a current control circuit power device, or adopts IGBT or silicon-controlled rectifier as a high-power (high-voltage and high-current) test system of a control device.
The field effect transistor has the advantages that the corresponding time of current control is short, the test equipment manufactured on the basis of the field effect transistor is high in control precision and high in current response speed (nanosecond), but the requirement of high-power test equipment cannot be met due to the fact that the power of the field effect transistor is small. The prior art adopts the parallelly connected form of field effect transistor, enlarges test system's power as far as possible, nevertheless because the difficult screening of field effect transistor uniformity for field effect transistor has the uniformity difference to change in the use, and the more big problem of uniformity difference that just counts, makes to use field effect transistor as high-power test equipment to become the limitation on the market, and current domestic market does not regard field effect transistor as high-power battery (group) test system's basic control module.
The IGBT is a composite fully-controlled voltage-driven power semiconductor device composed of a BJT (bipolar transistor) and an MOS (insulated gate field effect transistor), and has the advantages of both high input impedance of the MOSFET and low conduction voltage drop of the GTR. The IGBT serving as a unit of high-power test equipment has the advantages of high power and relatively high response time and precision, becomes a basic circuit unit device of the test equipment which is more advanced than a silicon controlled tube at present, the advantages of the response time and the control precision of the IGBT are different from those of a field effect tube, and the equipment precision of the existing field effect tube serving as the basic unit circuit is 1%.
Due to the development of the industry, the mainstream of a battery enterprise is excessive from a 3C battery to a power battery (pack), and higher requirements are put on the testing of the battery. If higher requirements are put on the consistency of the single batteries, the consistency matching and testing of the batteries mainly test the electrical performance and the electrochemical performance of the batteries, so that products with similar performance are selected for matching. The testing of the capacity and the direct current resistance of the battery is generally completed by a battery charging and discharging tester, so that higher requirements are provided for index indexes (power, voltage precision, current control response time and voltage sampling time) of the battery charging and discharging tester, and the main current testing precision (0.2%) and the sampling frequency (2Hz) of the charging and discharging tester with 0.1% of the response time and the precision of the high-power battery charging and discharging tester based on IGBT in the market cannot meet the requirements of series-parallel connection testing of more batteries.
Disclosure of Invention
The invention provides a linear control circuit and a battery test system to solve the problems in the prior art.
In order to achieve the above object, the present invention provides a linear control circuit, which includes an a terminal for inputting an external control voltage signal, a B terminal and a C terminal connected to an external circuit and respectively used for inputting a current and outputting a current, a power transistor Q, a control chip IC1, and a control chip IC 2; a resistor R1 and a resistor R2 which are sequentially connected are connected in series between the end A and the end G of the power tube, a resistor R3 is connected in series between the end B and the end D of the power tube, and a resistor R4 is connected in series between the end C and the end S of the power tube; the control chip IC1 is used for collecting the voltage at two ends of the resistor R3 and outputting a preset compensation voltage to two ends of the resistor R1 when the collected voltage is greater than a preset threshold value; the control chip IC2 is used for collecting the voltage at the two ends of the resistor R4, amplifying the collected voltage in equal proportion and outputting the amplified voltage to the two ends of the resistor R2.
In a further preferred embodiment of the present invention, a resistor R0 for voltage division is further connected in series between the resistor R1 and the a terminal, and a resistor R5 for current limiting is further connected in series between the resistor R4 and the C terminal.
According to another aspect of the present invention, the present invention further provides a battery testing system, including at least two testing units connected in series between the positive and negative electrodes of a battery to be tested after being connected in parallel, where the testing units include a linear control module, a switching power supply module and a control chip IC3, and the linear control module includes at least two of the linear control circuits;
in each test unit, the A ends of all the linear control circuits are connected in parallel and then connected with the control chip IC3 in the corresponding test unit to input control voltage, the B ends of all the linear control circuits are connected in parallel and then connected with the anode of the battery to be tested, the C ends of all the linear control circuits are connected in parallel and then connected with the cathode of the battery to be tested through the switch power supply module, and the switch power supply module is further connected with the control chip IC3 to receive control signals.
As a further preferable technical scheme of the invention, the battery test system further comprises an upper computer, and the upper computer is respectively in communication connection with the control chip IC3 in each test unit.
As a further preferable technical scheme of the invention, the test unit is in communication connection with the upper computer through a serial port communication protocol or an Internet interconnection protocol.
As a further preferable technical scheme of the invention, the battery to be tested is a single lithium ion battery or a plurality of lithium ion battery packs connected in series or in parallel.
The linear control circuit comprises an A end for inputting an external control voltage signal, a B end and a C end which are connected into an external circuit and used for inputting current and outputting current respectively, a power tube Q, a control chip IC1 and a control chip IC 2; a resistor R1 and a resistor R2 which are sequentially connected are connected in series between the end A and the end G of the power tube, a resistor R3 is connected in series between the end B and the end D of the power tube, and a resistor R4 is connected in series between the end C and the end S of the power tube; the control chip IC1 is used for collecting the voltage at two ends of the resistor R3 and outputting a preset compensation voltage to two ends of the resistor R1 when the collected voltage is greater than a preset threshold value; the control chip IC2 is used for collecting the voltage at the two ends of the resistor R4, amplifying the collected voltage in equal proportion and outputting the amplified voltage to the two ends of the resistor R2. In the battery test system, a structure that a plurality of test units are connected in parallel is adopted, each test unit meets the requirement of independent test, and each test unit is connected in parallel by a multi-linear control circuit, so that a plurality of power tubes are connected in parallel in an interlocking manner, high-speed control on current change is realized, voltage test precision is improved, the sampling frequency of dynamic voltage of the battery is improved, and the direct current impedance (R ═ delta V/R) of the battery is accurately measured, so that the accurate test of the capacity of the battery is ensured.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a system schematic block diagram of one example provided by the linear control circuit of the present invention;
FIG. 2 is a schematic block diagram of an exemplary system for testing a battery of the present invention;
FIG. 3 is a schematic block diagram of an example provided by any of the test units of FIG. 2;
FIG. 4 is a functional block diagram of an example provided by the linear control module of FIG. 3.
The objects, features and advantages of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The invention will be further described with reference to the accompanying drawings and specific embodiments. In the preferred embodiments, the terms "upper", "lower", "left", "right", "middle" and "a" are used for clarity of description only, and are not used to limit the scope of the invention, and the relative relationship between the terms and the terms is not changed or modified substantially without changing the technical content of the invention.
As shown in fig. 1, the linear control circuit includes an a terminal for inputting an external control voltage signal, B and C terminals connected to the external circuit and respectively used for inputting and outputting a current, and a power transistor Q, a control chip IC1 and a control chip IC 2; a resistor R1 and a resistor R2 which are sequentially connected are connected in series between the end A and the end G of the power tube, a resistor R3 is connected in series between the end B and the end D of the power tube, and a resistor R4 is connected in series between the end C and the end S of the power tube; the control chip IC1 is used for collecting the voltage at two ends of the resistor R3 and outputting a preset compensation voltage to two ends of the resistor R1 when the collected voltage is greater than a preset threshold value; the control chip IC2 is used for collecting the voltage at the two ends of the resistor R4, amplifying the collected voltage in equal proportion and outputting the amplified voltage to the two ends of the resistor R2, so that the IC1, the resistor R1 and the resistor R3 form a safety control circuit based on the power tube Q, and the control chip IC2, the resistor R2 and the resistor R4 form a negative feedback interlocking control circuit based on the power tube Q.
The working principles of the safety control circuit and the negative feedback interlocking control circuit are respectively as follows:
the resistor R3 is a sampling resistor, the voltage across the R3 and the current passing through the power tube Q have a relationship of U to IR, and the control chip IC1 collects the voltage from the resistor R3 to determine whether the current passing through the R3 exceeds a safety value. The control chip IC1 compares the voltage collected from the resistor R3 with a preset threshold (the maximum voltage of the resistor R3, i.e., a safety value) in the control chip IC in real time, and if the collected voltage of the resistor R3 exceeds the safety value, the control chip IC1 immediately outputs a higher preset compensation voltage to the resistor R1. The voltage of the resistor R1 is increased, namely the voltage of the terminal G and the voltage of the terminal S are reduced, and the voltage reduction of the terminal G and the voltage of the terminal S enables the current flowing between the terminal D and the terminal S controlled by the power tube Q to be reduced, so that the power tube Q is protected from exceeding the range of safe current, and a safe control circuit is formed;
the resistor R4 is a sampling resistor of the current flowing through the power tube Q, the voltage across the resistor R3 and the current flowing through the power tube have a relationship of U ═ IR, the voltage across the resistor R4 is collected and converted to a voltage value across the resistor, and the control chip IC2 can amplify the voltage input to the resistor R4 in an equal ratio with respect to the voltage amplifier and input the amplified voltage to the resistor R2. When the current flowing through the power tube Q and the resistor R4 suddenly increases, the voltage across the resistor R2 increases simultaneously through the proportional amplification of the control chip IC2, and in addition, since the voltages of the B terminal and the a terminal do not change, the voltages of the G terminal and the S terminal decrease, which in turn causes the current from the D terminal to the S terminal of the power tube Q to decrease, thereby forming a negative feedback circuit.
In specific implementation, a resistor R0 for voltage division is further connected in series between the resistor R1 and the end a, and a resistor R5 for current limiting is further connected in series between the resistor R4 and the end C.
The utility model discloses a linear control circuit, its field effect transistor Q is the voltage through G end and S end, controls the electric current size of D end to S end, for example: the higher the voltage values of the G and S terminals of the field effect transistor Q, the greater the current passing through the D to S terminals. If the goal is to increase the current through the fet Q, then a voltage increase on the peripheral control circuit is required to the G terminal of the circuit; if the current flowing through the field effect transistor Q needs to be kept constant, only the voltage at the A end needs to be kept stable, and the problems of overcurrent, overload and the like caused by overlarge current passing through some power tubes due to the fact that the consistency of different power tubes is not high are solved.
As shown in fig. 2-4, the present invention further provides a battery testing system, which includes at least two testing units connected in parallel and then connected in series between the positive and negative electrodes of the battery to be tested, the testing units adopt a parallel connection mode, each testing unit can independently perform a controlled charge and discharge test in the battery test, each testing unit can reach the highest voltage of the whole testing system, and each testing unit can not reach the maximum current requirement of the battery testing system; the test unit comprises a linear control module, a switching power supply module and a control chip IC3, wherein the linear control module comprises at least two linear control circuits in any one of the embodiments;
in each test unit, the A ends of all the linear control circuits are connected in parallel and then connected with the control chip IC3 in the corresponding test unit to input control voltage, the B ends of all the linear control circuits are connected in parallel and then connected with the anode of the battery to be tested, the C ends of all the linear control circuits are connected in parallel and then connected with the cathode of the battery to be tested through the switch power supply module, and the switch power supply module is further connected with the control chip IC3 to receive control signals, so that all the linear control circuits in the same test unit are connected in parallel, an interlocking circuit is formed, and the problem that the power tube is damaged due to low current in the internal resistance of the power tube caused by the inconsistency of the power tube is solved.
The testing unit in the battery testing system is of a main structure, and a charging and discharging module in the testing process adopts a composite structure combining a switching power supply module and a linear control module. The structure that adopts many test units to connect in parallel can realize the battery charge-discharge function that awaits measuring of high voltage, heavy current, and every test unit can all realize constant current charging, constant current discharge, constant voltage charging, constant voltage discharge, constant power charge-discharge and the function of contravariant feedback electric wire netting. The switching power supply module is used for current control of constant current discharge and constant power discharge, has the advantages of high efficiency, small size, easy realization of inversion and low heat release of constant voltage control, but has the defects of large ripple and low control precision.
In specific implementation, the battery test system further comprises an upper computer, the upper computer is in communication connection with the control chip IC3 in each test unit respectively, the test units are in communication connection with the upper computer through a serial port communication protocol or a communication mode of Internet interconnection, if serial port communication of an RS485 bus is adopted, the upper computer is in communication with the control chip IC3 connected to the RS485 bus through the RS485 bus. The upper computer is provided with management software for battery testing and controls the unit modules through communication, so that each module has the functions of constant current charging, constant current discharging, constant voltage charging, constant voltage discharging, constant power charging and discharging and inversion feedback power grid.
In specific implementation, the battery to be tested is a single lithium ion battery, or a plurality of lithium ion battery packs connected in series or in parallel, and certainly, other batteries may also be used, which is not illustrated here.
In this embodiment, as shown in fig. 1, the gate of the power transistor of each linear control circuit is connected to resistors R0, R1, and R2, respectively, and the end of the resistor R0, i.e., the a end, is connected to the control chip IC for inputting the control voltage to control the current of the power transistor. The voltage of the resistors R1 and R2 is the output voltage of the control chip IC1 and the control chip IC2, and the negative feedback current control of the power tube Q is performed by the voltage. The control chip IC1 collects the current passing through the whole power tube from the resistor R3, the control chip IC1 carries out comparison control, when the control chip IC1 detects that the current passing through the resistor R3 exceeds the safe current of the power tube, the control chip IC1 is started, a high voltage is output to the resistor R1, because the input voltage of the A end is relatively stable, when the voltage of the resistor R1 is increased, the input voltage of the power tube on the left side of the resistor R2 is rapidly reduced, the input voltage of the input end of the resistor R2 determines the current of the whole power tube, and the current passing through the whole power tube can be rapidly reduced to achieve the purpose of protecting the whole power tube Q. And resistance R4 is the sampling resistor of power tube output current, and through resistance R4 electric current grow, the grow of resistance R4 both ends voltage signal, enlargies through IC2, the voltage grow of exporting resistance R2 both ends to realize interlocking control, when guaranteeing a plurality of linear control circuit parallel use, the current stable distribution has also avoided the power tube because inconsistent and lead to the phenomenon of current imbalance.
According to the battery test system, a structure that a plurality of test units are connected in parallel is adopted, each test unit meets the requirement of independent test, and each test unit is connected in parallel by a multi-linear control circuit, so that the multi-power tubes are connected in parallel in an interlocking manner, the high-speed control of current change is realized, the voltage test precision is improved, the sampling frequency of dynamic voltage of the battery is improved, the direct current impedance (R ═ delta V/R) of the battery is accurately measured, and the accurate test of the battery capacity is ensured.
Although specific embodiments of the present invention have been described above, it will be appreciated by those skilled in the art that these are merely examples and that many variations or modifications may be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims.
Claims (6)
1. The linear control circuit is characterized by comprising an A end for inputting an external control voltage signal, a B end and a C end which are connected to an external circuit and used for inputting current and outputting current respectively, a power tube Q, a control chip IC1 and a control chip IC 2; a resistor R1 and a resistor R2 which are sequentially connected are connected in series between the end A and the end G of the power tube, a resistor R3 is connected in series between the end B and the end D of the power tube, and a resistor R4 is connected in series between the end C and the end S of the power tube; the control chip IC1 is used for collecting the voltage at two ends of the resistor R3 and outputting a preset compensation voltage to two ends of the resistor R1 when the collected voltage is greater than a preset threshold value; the control chip IC2 is used for collecting the voltage at the two ends of the resistor R4, amplifying the collected voltage in equal proportion and outputting the amplified voltage to the two ends of the resistor R2.
2. The linear control circuit according to claim 1, wherein a resistor R0 for voltage division is further connected in series between the resistor R1 and the a terminal, and a resistor R5 for current limiting is further connected in series between the resistor R4 and the C terminal.
3. A battery test system is characterized by comprising at least two test units which are connected in series between the positive electrode and the negative electrode of a battery to be tested after being connected in parallel, wherein each test unit comprises a linear control module, a switching power supply module and a control chip IC3, and each linear control module comprises at least two linear control circuits according to claim 1 or 2;
in each test unit, the A ends of all the linear control circuits are connected in parallel and then connected with the control chip IC3 in the corresponding test unit to input control voltage, the B ends of all the linear control circuits are connected in parallel and then connected with the anode of the battery to be tested, the C ends of all the linear control circuits are connected in parallel and then connected with the cathode of the battery to be tested through the switch power supply module, and the switch power supply module is further connected with the control chip IC3 to receive control signals.
4. The battery test system of claim 3, further comprising an upper computer, wherein the upper computer is in communication connection with the control chip IC3 in each test unit.
5. The battery test system of claim 4, wherein the test unit is in communication connection with the upper computer through a serial communication protocol or an Internet protocol communication mode.
6. The battery test system according to any one of claims 3 to 5, wherein the battery to be tested is a single lithium ion battery or a plurality of lithium ion battery packs connected in series or in parallel.
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| CN201920803692.1U CN210572648U (en) | 2019-05-30 | 2019-05-30 | Linear control circuit and battery test system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110095729A (en) * | 2019-05-30 | 2019-08-06 | 深圳市六维科技有限公司 | A kind of linearity control circuit and battery test system |
| CN113176517A (en) * | 2021-04-15 | 2021-07-27 | 武汉励行科技有限公司 | Micro-current compensation method and system for precise control |
| CN113655358A (en) * | 2021-07-13 | 2021-11-16 | 上海艾为电子技术股份有限公司 | Test circuit and power protection chip of power tube |
-
2019
- 2019-05-30 CN CN201920803692.1U patent/CN210572648U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110095729A (en) * | 2019-05-30 | 2019-08-06 | 深圳市六维科技有限公司 | A kind of linearity control circuit and battery test system |
| CN113176517A (en) * | 2021-04-15 | 2021-07-27 | 武汉励行科技有限公司 | Micro-current compensation method and system for precise control |
| CN113655358A (en) * | 2021-07-13 | 2021-11-16 | 上海艾为电子技术股份有限公司 | Test circuit and power protection chip of power tube |
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