Cell simulator circuit, system and control method

Abstract

The invention discloses a cell simulator circuit, a cell simulator system and a control method. The cell simulator circuit comprises a power supply module, a control module, at least one isolation module and at least one voltage conversion module, the isolation modules and the voltage conversion modules are arranged in a one-to-one correspondence manner. The control module sends a control signal and a communication signal to the isolation module, the isolation module transmits the communication signal to the correspondingly arranged voltage conversion module according to the control signal, and the voltage conversion module converts a power supply voltage output by the power supply module into a first voltage output according to the communication signal; or, the isolation module disconnects the transmission of the communication signal according to the control signal, and the correspondingly arranged voltage conversion module has no output. The battery cell simulation circuit provided by the invention is simple in structure, reliable, easy to implement and low in development and operation and maintenance cost.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic circuits, and in particular to a battery cell simulator circuit, system and control method. Background Art

[0002] At present, battery cell simulators can simulate the behavior of lithium-ion batteries and can be used for testing and verification of battery management systems (BMS), making it easier for developers to perform various tests without using real batteries, which can greatly reduce development costs.

[0003] For the current battery cell simulator circuit, after the power module inputs the power supply voltage, the voltage conversion module isolates the output voltage to simulate the battery cell, and multiple isolated outputs are connected in series to simulate the battery cell series connection. However, since different simulated battery cell circuits connected in series have different reference grounds, it is necessary to solve the address recognition problem during isolated communication. At present, a series of circuit elements such as address chips and communication chips need to be set up to solve this problem, resulting in a complex structure and high cost of the battery cell simulator circuit. Summary of the invention

[0004] The present invention provides a cell simulator circuit, system and control method to solve the problems of complex structure and high cost of current cell simulator circuits.

[0005] In a first aspect, the present invention provides a cell simulator circuit, the cell simulator circuit comprising: a power module, a control module, at least one isolation module and at least one voltage conversion module; the isolation module and the voltage conversion module are arranged in a one-to-one correspondence;

[0006] The isolation module is connected to the control module and the corresponding voltage conversion module, and the voltage conversion module is connected to the power supply module; the output end of the voltage conversion module is connected in series with the output end of the adjacent voltage conversion module;

[0007] The control module sends a control signal and a communication signal to the isolation module, the isolation module transmits the communication signal to a correspondingly set voltage conversion module according to the control signal, and the voltage conversion module converts the power supply voltage output by the power supply module into a first voltage output according to the communication signal;

[0008] Alternatively, the isolation module disconnects the transmission of the communication signal according to the control signal, and the corresponding voltage conversion module has no output.

[0009] Optionally, the voltage conversion module includes: a DC-DC isolation unit and a voltage conversion unit;

[0010] The DC-DC isolation unit is connected to the power module and the voltage conversion unit, and the DC-DC isolation unit converts the power voltage output by the power module into a second voltage and outputs it to the voltage conversion unit;

[0011] The voltage conversion unit is connected to the isolation module, the isolation module transmits the communication signal to the voltage conversion unit according to the control signal, and the voltage conversion unit converts the second voltage into the first voltage output according to the communication signal;

[0012] Alternatively, the isolation module disconnects the transmission of the communication signal according to the control signal, and the voltage conversion unit has no output.

[0013] Optionally, the voltage conversion unit includes a step-down circuit, and the step-down circuit includes a step-down chip;

[0014] The step-down circuit is connected to the DC-DC isolation unit, and the step-down circuit is also connected to the isolation module. The isolation module transmits the communication signal to the step-down chip according to the control signal, and the step-down circuit converts the second voltage into the first voltage output according to the communication signal;

[0015] Alternatively, the isolation module disconnects the transmission of the communication signal according to the control signal, and the step-down circuit has no output.

[0016] Optionally, the step-down chip includes a first serial clock port and a first serial data port, the isolation module includes a primary part and a secondary part, the secondary part includes a second serial clock port and a second serial data port, and the primary part includes a third serial clock port and a third serial data port;

[0017] The first serial clock port is connected to the second serial clock port, the first serial data port is connected to the second serial data port, and the third serial clock port and the third serial data port are connected to the control module;

[0018] The third serial clock port and the third serial data port receive the communication signal, the isolation module transmits the communication signal to the second serial clock port and the second serial data port according to the control signal, and the first serial clock port and the first serial data port receive the communication signal;

[0019] Alternatively, the third serial clock port and the third serial data port receive communication signals, and the isolation module disconnects the transmission of communication signals to the second serial clock port and the second serial data port according to the control signal, and the first serial clock port and the first serial data port cannot receive communication signals.

[0020] Optionally, the cell simulator circuit further includes: a DC-DC conversion module;

[0021] The DC-DC conversion module is connected to the power module, and the DC-DC conversion module converts the power voltage output by the power module into a third voltage output;

[0022] The DC-DC conversion module is also connected to the control module and the isolation module. The DC-DC conversion module outputs a third voltage to the control module and the isolation module to provide power for the control module and the isolation module.

[0023] Optionally, the isolation module includes a switch unit and an isolation chip;

[0024] The control end of the switch unit is connected to the control module, the first end of the switch unit is connected to the DC-DC conversion module, and the second end of the switch unit is connected to the power supply end of the isolation chip; the isolation chip is connected to the control module and the corresponding voltage conversion module;

[0025] The control module sends a control signal to the switch unit, the control module sends a communication signal to the isolation chip, the switch unit is turned on according to the control signal, the third voltage is transmitted to the power supply end of the isolation chip, and the isolation chip transmits the communication signal to the voltage conversion module;

[0026] Alternatively, the switch unit is disconnected according to the control signal, and the isolation chip disconnects the transmission of the communication signal.

[0027] Optionally, the switch unit includes a first resistor, a second resistor and a first transistor;

[0028] The first end of the first resistor is connected to the control module, the second end of the first resistor is connected to the first end of the second resistor and the control end of the first transistor, the second end of the second resistor is connected to the first end of the first transistor, and are connected together to the DC-DC conversion module, and the second end of the first transistor is connected to the power supply end of the isolation chip.

[0029] Optionally, the control module includes: a micro control unit;

[0030] The micro control unit comprises a fourth serial clock port and a fourth serial data port, the fourth serial clock port is connected to the third serial clock port, and the fourth serial data port is connected to the third serial data port;

[0031] The fourth serial clock port and the fourth serial data port transmit communication signals to the third serial clock port and the third serial data port.

[0032] In a second aspect, the present invention provides a battery cell simulator system, wherein the battery cell simulator system includes the battery cell simulator circuit provided in the first aspect.

[0033] In a third aspect, the present invention provides a control method for a cell simulator circuit, wherein the cell simulator circuit includes a power module, a control module, at least one isolation module and at least one voltage conversion module; the isolation module and the voltage conversion module are arranged in a one-to-one correspondence; the isolation module is connected to the control module and the correspondingly arranged voltage conversion module, and the voltage conversion module is connected to the power module; the output end of the voltage conversion module is connected in series with the output end of the adjacent voltage conversion module; the control method includes:

[0034] The control module sends a control signal and a communication signal to the isolation module, wherein one of the isolation modules transmits the communication signal to a correspondingly set voltage conversion module according to the control signal, and the voltage conversion module converts the power supply voltage output by the power supply module into a first voltage output according to the communication signal;

[0035] The remaining isolation modules disconnect the transmission of the communication signal according to the control signal, and the corresponding voltage conversion modules have no output.

[0036] The technical solution of the embodiment of the present invention is to set a voltage conversion module with a communication function, and send different control signals through the control module to control whether different isolation modules transmit communication signals to the voltage conversion module. Only the voltage conversion module that receives the communication signal forms a controllable output battery cell simulation voltage, and the voltage conversion module that does not receive the communication signal has no output. Therefore, the technical solution of the embodiment of the present invention can select and set the output of a certain voltage conversion module separately, that is, it can select and set the output voltage value of a certain string of simulated batteries separately, which is equivalent to realizing the addressing function in isolated communication. There is no need to set a series of circuit elements such as address chips and communication chips to solve the address recognition problem during isolated communication. The battery cell simulation circuit structure provided by the technical solution of the embodiment of the present invention is simple, reliable and easy to implement, and has low development and operation and maintenance costs. Since the technical solution of the embodiment of the present invention effectively reduces the number of devices in the battery cell simulation circuit and simplifies the circuit structure, when the circuit is applied, the area of ​​the circuit board is small, the equipment volume is small, and the assembly and operation are simple and convenient. It is suitable for application scenarios that require simulation of a large number of batteries and real-time and rapid control of simulated battery cell parameters, providing effective help for the development of BMS.

[0037] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0039] Figure 1 is a structural schematic diagram of a battery cell simulator circuit provided by an embodiment of the present invention;

[0040] Figure 2 is a structural schematic diagram of another battery cell simulator circuit provided by an embodiment of the present invention;

[0041] Figure 3 is a structural schematic diagram of another battery cell simulator circuit provided by an embodiment of the present invention;

[0042] Figure 4 is a structural schematic diagram of another battery cell simulator circuit provided by an embodiment of the present invention;

[0043] Figure 5 is a structural schematic diagram of another battery cell simulator circuit provided by an embodiment of the present invention;

[0044] Figure 6 It is a flow chart of a control method of a battery cell simulator circuit provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0045] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0046] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0047] Figure 1 is a schematic diagram of the structure of a cell simulator circuit provided by an embodiment of the present invention, such as Figure 1 As shown, the circuit includes: a power module 1, a control module 2, at least one isolation module 3 and at least one voltage conversion module 4. The isolation module 3 and the voltage conversion module 4 are arranged in a one-to-one correspondence. The isolation module 3 is connected to the control module 2 and the correspondingly arranged voltage conversion module 4, and the voltage conversion module 4 is connected to the power module 1. The output end of the voltage conversion module 4 is connected in series with the output end of the adjacent voltage conversion module 4. The control module 2 sends a control signal and a communication signal to the isolation module 3, and the isolation module 3 transmits the communication signal to the correspondingly arranged voltage conversion module 4 according to the control signal, and the voltage conversion module 4 converts the power supply voltage output by the power module 1 into a first voltage output according to the communication signal. Alternatively, the isolation module 3 disconnects the transmission of the communication signal according to the control signal, and the correspondingly arranged voltage conversion module 4 has no output.

[0048] Specifically, the power module 1 can be a DC power supply, and the power module 1 includes an output positive pole IN+ and an output negative pole IN-. Exemplarily, the power supply voltage output by the power module 1 can be 24V. The battery cell simulator circuit includes a plurality of isolation modules 3 and a voltage conversion module 4, and the number of isolation modules 3 and voltage conversion modules 4 is the same. Different isolation modules 3 are connected to different control terminals of the control module 2, that is, the control module 2 can send different or the same control signals to the isolation module 3. Different isolation modules 3 can be connected to the same communication terminal of the control module 2, that is, the control module 2 can send the same communication signal to the isolation module 3 at the same time, and the isolation module 3 plays the role of communication signal transmission. The voltage conversion module 4 has a communication function, and it can communicate with the control module through the isolation module 3.

[0049] The isolation module 3 can transmit the communication signal to the corresponding voltage conversion module 4 according to the control signal, and the voltage conversion module 4 forms a controllable output cell simulation voltage from the power supply voltage output by the power supply module 1 according to the communication signal, that is, converts it into a first voltage output. The voltage value and current value output by the voltage conversion module 4 can change according to the communication signal, and the outputs of different voltage conversion modules 4 do not share a common ground. The isolation module 3 can also disconnect the transmission of the communication signal according to the control signal, and the corresponding voltage conversion module 4 has no output. Exemplarily, the control module 4 can only control one of the voltage conversion modules 4 to have an output, and the control module 4 sends a valid control signal to the corresponding isolation module 3, and the isolation module 3 transmits the communication signal to the corresponding voltage conversion module 4, and the voltage conversion module 4 forms a controllable output cell simulation voltage from the power supply voltage output by the power supply module 1 according to the communication signal. The control module 4 sends an invalid control signal to the remaining isolation modules 3, and the isolation module 3 disconnects the transmission of the communication signal, and the corresponding voltage conversion module 4 has no output.

[0050] The output of each voltage conversion module 4 is equivalent to a string of battery cell voltage simulation outputs, and the output end of the voltage conversion module 4 is connected in series with the output end of the adjacent voltage conversion module 4, which is equivalent to the battery cell voltage simulation outputs being connected end to end, simulating the battery stacking effect. Exemplarily, the positive pole OUT+ of the nth string of battery cell voltage simulation outputs is short-circuited with the negative pole OUT- of the n+1th string of battery cell voltage simulation outputs, the positive pole OUT+ of the n+1th string of battery cell voltage simulation outputs is short-circuited with the negative pole OUT- of the n+2th string of battery cell voltage simulation outputs, and so on.

[0051] The technical solution of the embodiment of the present invention is to set a voltage conversion module with a communication function, and send different control signals through the control module to control whether different isolation modules transmit communication signals to the voltage conversion module. Only the voltage conversion module that receives the communication signal forms a controllable output battery cell simulation voltage, and the voltage conversion module that does not receive the communication signal has no output. Therefore, the technical solution of the embodiment of the present invention can select and set the output of a certain voltage conversion module separately, that is, it can select and set the output voltage value of a certain string of simulated batteries separately, which is equivalent to realizing the addressing function in isolated communication. There is no need to set a series of circuit elements such as address chips and communication chips to solve the address recognition problem during isolated communication. The battery cell simulation circuit structure provided by the technical solution of the embodiment of the present invention is simple, reliable and easy to implement, and has low development and operation and maintenance costs. Since the technical solution of the embodiment of the present invention effectively reduces the number of devices in the battery cell simulation circuit and simplifies the circuit structure, when the circuit is applied, the area of ​​the circuit board is small, the equipment volume is small, and the assembly and operation are simple and convenient. It is suitable for application scenarios that require simulation of a large number of batteries and real-time and rapid control of simulated battery cell parameters, providing effective help for the development of BMS.

[0052] Optionally, based on the above embodiments, Figure 2 is a schematic diagram of the structure of another battery cell simulator circuit provided by an embodiment of the present invention, such as Figure 2 As shown, the voltage conversion module 4 includes: a DC-DC isolation unit 41 and a voltage conversion unit 42. The DC-DC isolation unit 41 is connected to the power module 1 and the voltage conversion unit 42, and the DC-DC isolation unit 41 converts the power voltage output by the power module 1 into a second voltage and outputs it to the voltage conversion unit 42. The voltage conversion unit 42 is connected to the isolation module 3, and the isolation module 3 transmits the communication signal to the voltage conversion unit 42 according to the control signal, and the voltage conversion unit 42 converts the second voltage into a first voltage and outputs it according to the communication signal. Alternatively, the isolation module 3 disconnects the transmission of the communication signal according to the control signal, and the voltage conversion unit 42 has no output.

[0053] Specifically, the power supply voltage output by the power module 1 is converted by the DC-DC isolation unit 41 to output an independent second voltage, and the multiple second voltages output by the multiple DC-DC isolation units 41 are not connected to the same ground. The DC-DC isolation unit 41 can perform a first-pole voltage reduction on the power supply voltage output by the power module 1. Exemplarily, the DC-DC isolation unit 41 can convert the power supply voltage output by the power module 1 into a 5V voltage output. The voltage conversion unit 42 has a communication function, and the voltage conversion unit 42 can communicate with the control module 2 through the isolation module 3. The DC-DC isolation unit 41 outputs a first voltage to the voltage conversion unit 42, and the isolation module 3 can transmit a communication signal to the voltage conversion unit 42 according to the control signal. The voltage conversion unit 42 performs a second-pole voltage reduction on the power supply voltage output by the power module 1 according to the communication signal to form a controllable output battery cell analog voltage, that is, converts it into a first voltage output. The isolation module 3 can also disconnect the transmission of the communication signal according to the control signal, and the voltage conversion unit 42 has no output.

[0054] Optionally, based on the above embodiments, Figure 3 is a schematic diagram of the structure of another battery cell simulator circuit provided by an embodiment of the present invention, such as Figure 3 As shown, the voltage conversion unit 42 includes a buck circuit 421, and the buck circuit 421 includes a buck chip U1. The buck circuit 421 is connected to the DC-DC isolation unit 41, and the buck circuit 421 is connected to the isolation module 3. The isolation module 3 transmits the communication signal to the buck chip U1 according to the control signal, and the buck circuit 421 converts the second voltage into the first voltage output according to the communication signal. Alternatively, the isolation module 3 disconnects the transmission of the communication signal according to the control signal, and the buck circuit 421 has no output.

[0055] Specifically, the voltage conversion unit 42 may include a buck circuit 421, and the buck circuit 421 performs a second-pole step-down process on the power supply voltage output by the power module 1. The buck circuit 421 may include a buck chip U1, and the buck chip U1 may have a communication function. The buck chip U1 may communicate with the control module 2 through the isolation module 3. The DC-DC isolation unit 41 outputs a first voltage to the buck circuit 421, and the isolation module 3 may transmit a communication signal to the buck chip U1 according to a control signal. The buck circuit 421 performs a second-pole step-down process on the power supply voltage output by the power module 1 according to the communication signal to form a controllable output cell analog voltage, that is, convert it into a first voltage output. The isolation module 3 can also disconnect the transmission of the communication signal according to the control signal, and the buck circuit 421 has no output.

[0056] Optionally, based on the above embodiments, continue to refer to Figure 3 The step-down chip U1 includes a first serial clock port SCL1 and a first serial data port SDA1, the isolation module 3 includes a primary part and a secondary part, the secondary part includes a second serial clock port SCL2 and a second serial data port SDA2, and the primary part includes a third serial clock port SCL3 and a third serial data port SDA3. The first serial clock port SCL1 and the second serial clock port SCL2 are connected, the first serial data port SDA1 and the second serial data port SDA2 are connected, and the third serial clock port SCL3 and the third serial data port SDA3 are connected to the control module 2. The third serial clock port SCL3 and the third serial data port SDA3 receive communication signals, and the isolation module 3 transmits communication signals to the second serial clock port SCL2 and the second serial data port SDA2 according to the control signal, and the first serial clock port SCL1 and the first serial data port SDA1 receive communication signals. Alternatively, the third serial clock port SCL3 and the third serial data port SDA3 receive communication signals, and the isolation module 3 stops transmitting communication signals to the second serial clock port SCL2 and the second serial data port SDA2 according to the control signal, and the first serial clock port SCL1 and the first serial data port SDA1 cannot receive communication signals.

[0057] Specifically, the buck chip U1 can perform IIC communication with the control module 2 through the isolation module 3. The control module 2 may include a first control terminal s n and the second control terminal n+1 The control module 2 may also include a plurality of other control terminals, and the number of control terminals in the control module 2 must be greater than or equal to the number of isolation modules 3. One of the isolation modules 3 is connected to the first control terminal s n Another isolation module 3 is connected to the second control terminal s n+1 For example, the first control terminal s nA first control signal can be sent to one of the isolation modules 3. The first control signal can be a valid control signal. The third serial clock port SCL3 and the third serial data port SDA3 of the isolation module 3 receive the communication signal and transmit the communication signal to the second serial clock port SCL2 and the second serial data port SDA2. The first serial clock port SCL1 and the first serial data port SDA1 receive the communication signal. The buck circuit 421 forms a controllable output cell analog voltage, that is, converts it into a first voltage output. The second control terminal s n+1 A second control signal can be sent to another isolation module 3, and the second control signal can be an invalid control signal. The third serial clock port SCL3 and the third serial data port SDA3 of the isolation module 3 receive the communication signal, but the isolation module 3 disconnects the transmission of the communication signal to the second serial clock port SCL2 and the second serial data port SDA2, and the first serial clock port SCL1 and the first serial data port SDA1 cannot receive the communication signal, and the step-down circuit 421 has no output.

[0058] Optionally, based on the above embodiments, Figure 4 is a schematic diagram of the structure of another battery cell simulator circuit provided by an embodiment of the present invention, such as Figure 4 As shown, the cell simulator circuit also includes: a DC-DC conversion module 5. The DC-DC conversion module 5 is connected to the power module 1, and the DC-DC conversion module 5 converts the power voltage output by the power module 1 into a third voltage output. The DC-DC conversion module 5 is also connected to the control module 2 and the isolation module 3, and the DC-DC conversion module 5 outputs the third voltage to the control module 2 and the isolation module 3 to supply power to the control module 2 and the isolation module 3.

[0059] Specifically, the cell simulator circuit may further include a DC-DC conversion module 5, the input end of the DC-DC conversion module 5 is connected to the output positive electrode IN+ and the output negative electrode IN- of the power module 1, and the DC-DC conversion module 5 may convert the power supply voltage output by the power module 1 into a third voltage output, and illustratively, the third voltage may be 3.3 V. The DC-DC conversion module 5 outputs the third voltage to the control module 2 and the isolation module 3 to supply power to the control module 2 and the isolation module 3.

[0060] Optionally, based on the above embodiments, continue to refer to Figure 4, the isolation module 3 includes a switch unit 32 and an isolation chip 31. The control end of the switch unit 32 is connected to the control module 2, the first end of the switch unit 32 is connected to the DC-DC conversion module 5, and the second end of the switch unit 32 is connected to the power supply end VCC of the isolation chip 31; the isolation chip 31 is connected to the control module 2 and the corresponding voltage conversion module 4. The control module 2 sends a control signal to the switch unit 32, the control module 2 sends a communication signal to the isolation chip 31, the switch unit 32 is turned on according to the control signal, the third voltage is transmitted to the power supply end VCC of the isolation chip 31, and the isolation chip 31 transmits the communication signal to the voltage conversion module 4. Alternatively, the switch unit 32 is disconnected according to the control signal, and the isolation chip 31 disconnects the transmission of the communication signal.

[0061] Specifically, the output of the DC-DC conversion module 5 may include an output positive terminal and an output negative terminal, and the output positive terminal and the output negative terminal of the DC-DC conversion module 5 are connected to the power port and the ground port of the control module 2, so that the DC-DC conversion module 5 supplies power to the control module 2. The isolation module 3 may include an isolation chip 31 and a switch unit 32, and the control end of the switch unit 32 is connected to the control module 2. The control module 2 sends a control signal to the control end of the switch unit 32, and the switch module 32 is also connected between the output positive end of the DC-DC conversion module 5 and the power end VCC of the isolation chip 31. The isolation chip 31 may include a primary circuit unit and a secondary circuit unit. In the above embodiment, the primary part of the isolation module 3 may include the switch unit 32 and the primary circuit unit of the isolation chip 31, and the secondary part of the isolation module 3 may include the secondary circuit unit of the isolation chip 31. The power end VCC of the primary circuit unit is connected to the switch unit 32, and the ground end GND of the primary circuit unit is connected to the output negative end of the DC-DC conversion module 5, that is, the DC-DC conversion module 5 supplies power to the primary circuit unit of the isolation chip 31 through the switch unit 32. The secondary circuit unit may be powered by the second voltage output by the DC-DC isolation unit 41 .

[0062] Exemplarily, the first control terminal s n A first control signal can be sent to the switch unit 31 of one of the isolation modules 3. The first control signal can be a valid control signal. The switch unit 32 is turned on. The DC-DC conversion module 5 outputs a third voltage to power the primary circuit unit of the isolation chip 31. The third serial clock port SCL3 and the third serial data port SDA3 of the primary circuit unit receive the communication signal and transmit the communication signal to the second serial clock port SCL2 and the second serial data port SDA2 of the secondary circuit unit of the isolation chip 31. The first serial clock port SCL1 and the first serial data port SDA1 receive the communication signal. The buck circuit 421 forms a controllable output cell analog voltage, that is, it is converted into a first voltage output. The second control terminal s n+1A second control signal can be sent to the switch unit 32 of another isolation module 3, and the second control signal can be an invalid control signal. The switch unit 32 is turned off, and the primary circuit unit of the isolation chip 31 is not powered, so that the isolation chip 31 does not work. The third serial clock port SCL3 and the third serial data port SDA3 of the primary circuit unit of the isolation chip 31 receive the communication signal, but the isolation chip 31 disconnects the second serial clock port SCL2 and the second serial data port SDA2 that transmit the communication signal to the secondary circuit unit, and the first serial clock port SCL1 and the first serial data port SDA1 cannot receive the communication signal, and the buck circuit 421 has no output.

[0063] Optionally, based on the above embodiments, Figure 5 is a schematic diagram of the structure of another battery cell simulator circuit provided by an embodiment of the present invention, such as Figure 5 As shown, the switch unit 32 includes a first resistor R1, a second resistor R2 and a first transistor Q1. The first end of the first resistor R1 is connected to the control module 2, the second end of the first resistor R1 is connected to the first end of the second resistor R2 and the control end of the first transistor Q1, the second end of the second resistor R2 is connected to the first end of the first transistor Q1, and they are connected to the DC-DC conversion module 5, and the second end of the first transistor Q1 is connected to the power supply end VCC of the isolation chip 31.

[0064] Specifically, the first transistor Q1 includes but is not limited to a bipolar transistor, a field effect transistor, a composite transistor or any combination of the above transistors. The principle is explained by taking the first transistor Q1 as a P-type metal oxide semiconductor field effect transistor (P-Metal-Oxide-Semiconductor Field-Effect Transistor, PMOSFET) as an example. For example, the first control terminal s n The output of the voltage conversion module 4 corresponding to the connected isolation module 3 is the analog output of the first string of cells. n+1 The output of the voltage conversion module 4 corresponding to the connected isolation module 3 is the analog output of the second string of cells.

[0065] When only the simulated output voltage of the first string of cells needs to be designed to be a first value, for example, the first value may be 3.3V, then the first control terminal s 1 of the control module 2 corresponding to the first string of simulated cells may be controlled simultaneously. n The first control signal output is low level, while the control signal output by the control end of the control module 2 corresponding to all other analog cells in series is high level. For example, the second control end s n+1 The output control signal is at a high level, so as to achieve the effect that only the isolation chip 31 of the first string of analog cells works.

[0066] For example, when the first control terminal s of the control module 2 n When the output first control signal is 0V, and the third voltage output by the DC-DC conversion module 5 is 3.3V, the resistance value of R1 is 1kΩ, and the resistance value of R2 is 1MΩ, the corresponding gate voltage of the first transistor Q1 is:

[0067]

[0068] Among them, V G_Q1 is the gate voltage of the first transistor Q1.

[0069] The voltage difference between the gate and source voltage of the first transistor Q1 is:

[0070] V GS_Q1 =0.003V-3.3V=-3.297V

[0071] Among them, V GS_Q1 is the voltage difference between the gate and source voltages of the first transistor Q1.

[0072] The voltage difference between the gate and source voltages of the first transistor Q1 has reached the turn-on voltage of the first transistor Q1, so the first transistor Q1 is turned on, the isolation chip 31 of the first string of analog cells works, the third serial clock port SCL3 and the third serial data port SDA3 of the primary circuit unit receive the communication signal, and transmit the communication signal to the second serial clock port SCL2 and the second serial data port SDA2 of the secondary circuit unit of the isolation chip 31, and the first serial clock port SCL1 and the first serial data port SDA1 receive the communication signal. The buck circuit 421 forms a controllable output cell analog voltage, that is, converts it into a first voltage output.

[0073] At the same time, the control signal output by the control terminal of the control module 2 corresponding to all other analog cells in series is high level, for example, the second control terminal s n+1 The output control signal is high level, and the second control terminal s n+1 The output control signal can be 3.3V. At this time, the voltages across the first resistor R1 and the second resistor R2 are equal, and the first resistor R1 and the second resistor R2 have no voltage-dividing effect, so the gate voltage of the corresponding first transistor Q1 is 3.3V. Since the source voltage of the corresponding first transistor Q1 is also 3.3V, the voltage difference between the gate and source of the first transistor Q1 is:

[0074] V GS_Q1" =3.3V-3.3V=0V

[0075] The voltage difference between the gate and the source of the first transistor Q1 does not reach its turn-on voltage, so the first transistor Q1 is turned off, and the isolation chip 31 of the second string of analog cells does not work because it cannot obtain power.

[0076] When only the isolation chip 31 of the first string of analog cell circuits is working, the control module 2 can complete IIC communication with the buck chip of the first string of analog cell circuits without being interfered by the isolated communication signals of other strings. The control module 2 sends instructions to the buck chip through the IIC communication method to change the voltage reference value fed back by the circuit in the buck chip, thereby changing the output voltage of the buck circuit, that is, the first voltage.

[0077] Similarly, after setting the output voltage of the first string of simulated cells, only the second control terminal s of the control module 2 is controlled. n+1 When the output second control signal is at a low level and the other control signals are at a high level, the control module 2 can select the buck chip in the second string of simulated battery cells and communicate with it, completing the setting of the voltage output of the second string of simulated battery cells. And so on, the voltage values ​​of each string of simulated battery cells are set in turn.

[0078] Optionally, based on the above embodiments, continue to refer to Figure 5 The control module 2 includes: a micro control unit. The micro control unit includes a fourth serial clock port SCL4 and a fourth serial data port SDA4, the fourth serial clock port SCL4 is connected to the third serial clock port SCL3, and the fourth serial data port SDA4 is connected to the third serial data port SDA3. The fourth serial clock port SCL4 and the fourth serial data port SDA4 transmit communication signals to the third serial clock port SCL3 and the third serial data port SDA3.

[0079] Specifically, the buck chip U1 performs IIC communication with the microcontroller unit through the isolation chip 31. The fourth serial clock port SCL4 and the fourth serial data port SDA4 transmit communication signals to the third serial clock port SCL3 and the third serial data port SDA3. When the first transistor Q1 is turned on, the third serial clock port SCL3 and the third serial data port SDA3 receive the communication signal, and transmit the communication signal to the second serial clock port SCL2 and the second serial data port SDA2 of the secondary circuit unit of the isolation chip 31, and the first serial clock port SCL1 and the first serial data port SDA1 receive the communication signal. The buck circuit 421 forms a controllable output cell analog voltage, that is, it is converted into a first voltage output. When the first transistor Q1 is turned off, the primary circuit unit of the isolation chip 31 is not powered, so that the isolation chip 31 does not work, and the isolation chip 31 disconnects the second serial clock port SCL2 and the second serial data port SDA2 that transmit the communication signal to the secondary circuit unit, and the first serial clock port SCL1 and the first serial data port SDA1 cannot receive the communication signal, and the buck circuit 421 has no output.

[0080] The technical solution of the embodiment of the present invention provides a battery cell simulator system, wherein the battery cell simulator system includes any battery cell simulator circuit provided by any of the above embodiments of the present invention, and has the beneficial effects of any battery cell simulator circuit provided by any of the above embodiments of the present invention.

[0081] Figure 6 is a flow chart of a control method of a cell simulator circuit provided by an embodiment of the present invention, wherein Figure 1 As shown, the cell simulator circuit includes a power module 1, a control module 2, at least one isolation module 3 and at least one voltage conversion module 4. The isolation module 3 and the voltage conversion module 4 are arranged in a one-to-one correspondence. The isolation module 3 is connected to the control module 2 and the correspondingly arranged voltage conversion module 4, and the voltage conversion module 4 is connected to the power module 1; the output end of the voltage conversion module 4 is connected in series with the output end of the adjacent voltage conversion module 4. Figure 6 As shown, the control method includes:

[0082] S100: The control module sends a control signal and a communication signal to the isolation module, wherein one of the isolation modules transmits the communication signal to a correspondingly set voltage conversion module according to the control signal, and the voltage conversion module converts the power supply voltage output by the power supply module into a first voltage output according to the communication signal.

[0083] Specifically, Figure 1As shown, the power module 1 can be a DC power supply, and the power module 1 includes an output positive pole IN+ and an output negative pole IN-. Exemplarily, the power supply voltage output by the power module 1 can be 24V. The battery cell simulator circuit includes a plurality of isolation modules 3 and a voltage conversion module 4, and the number of isolation modules 3 and voltage conversion modules 4 is the same. Different isolation modules 3 are connected to different control terminals of the control module 2, that is, the control module 2 can send different or the same control signals to the isolation module 3. Different isolation modules 3 can be connected to the same communication terminal of the control module 2, that is, the control module 2 can send the same communication signal to the isolation module 3 at the same time, and the isolation module 3 plays the role of communication signal transmission. The voltage conversion module 4 has a communication function, and it can communicate with the control module through the isolation module 3.

[0084] The isolation module 3 can transmit the communication signal to the corresponding voltage conversion module 4 according to the control signal, and the voltage conversion module 4 forms a controllable output battery cell simulation voltage from the power supply voltage output by the power supply module 1 according to the communication signal, that is, converts it into a first voltage output. The voltage value and current value output by the voltage conversion module 4 can change according to the communication signal, and the outputs of different voltage conversion modules 4 do not share a common ground. The isolation module 3 can also disconnect the transmission of the communication signal according to the control signal, and the corresponding voltage conversion module 4 has no output. Exemplarily, the control module 4 can only control one of the voltage conversion modules 4 to have an output, and the control module 4 sends a valid control signal to the corresponding isolation module 3. The isolation module 3 transmits the communication signal to the corresponding voltage conversion module 4, and the voltage conversion module 4 forms a controllable output battery cell simulation voltage from the power supply voltage output by the power supply module 1 according to the communication signal.

[0085] S110: The remaining isolation modules disconnect the transmission of the communication signal according to the control signal, and the corresponding voltage conversion modules have no output.

[0086] Specifically, Figure 1 As shown, the control module 4 sends an invalid control signal to the remaining isolation modules 3, the isolation modules 3 disconnect the transmission of the communication signal, and the corresponding voltage conversion module 4 has no output.

[0087] The output of each voltage conversion module 4 is equivalent to a string of battery cell voltage simulation outputs, and the output end of the voltage conversion module 4 is connected in series with the output end of the adjacent voltage conversion module 4, which is equivalent to the battery cell voltage simulation outputs being connected end to end, simulating the battery stacking effect. Exemplarily, the positive pole OUT+ of the nth string of battery cell voltage simulation outputs is short-circuited with the negative pole OUT- of the n+1th string of battery cell voltage simulation outputs, the positive pole OUT+ of the n+1th string of battery cell voltage simulation outputs is short-circuited with the negative pole OUT- of the n+2th string of battery cell voltage simulation outputs, and so on.

[0088] The control method of the battery cell simulator circuit provided in the above embodiment of the present invention can control any battery cell simulator circuit provided in any of the above embodiments of the present invention, and has the beneficial effects of any battery cell simulator circuit provided in any of the above embodiments of the present invention.

[0089] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0090] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery cell simulator circuit, characterized in that: include: A power module, a control module, at least one isolation module and at least one voltage conversion module; The isolation module and the voltage conversion module are arranged in a one-to-one correspondence; The isolation module is connected to the control module and the corresponding voltage conversion module, and the voltage conversion module is connected to the power supply module; the output end of the voltage conversion module is connected in series with the output end of the adjacent voltage conversion module; The control module sends a control signal and a communication signal to the isolation module, the isolation module transmits the communication signal to the corresponding voltage conversion module according to the control signal, and the voltage conversion module converts the power supply voltage output by the power supply module into a first voltage output according to the communication signal; Alternatively, the isolation module disconnects the transmission of the communication signal according to the control signal, and the corresponding voltage conversion module has no output.

2. The cell simulator circuit according to claim 1, characterized in that: The voltage conversion module includes: a DC-DC isolation unit and a voltage conversion unit; The DC-DC isolation unit is connected to the power module and the voltage conversion unit, and the DC-DC isolation unit converts the power voltage output by the power module into a second voltage and outputs it to the voltage conversion unit; The voltage conversion unit is connected to the isolation module, the isolation module transmits the communication signal to the voltage conversion unit according to the control signal, and the voltage conversion unit converts the second voltage into a first voltage output according to the communication signal; Alternatively, the isolation module disconnects the transmission of the communication signal according to the control signal, and the voltage conversion unit has no output.

3. The cell simulator circuit according to claim 2, characterized in that: The voltage conversion unit includes a step-down circuit, and the step-down circuit includes a step-down chip; The step-down circuit is connected to the DC-DC isolation unit, and the step-down circuit is also connected to the isolation module. The isolation module transmits the communication signal to the step-down chip according to the control signal, and the step-down circuit converts the second voltage into a first voltage output according to the communication signal; Alternatively, the isolation module disconnects the transmission of the communication signal according to the control signal, and the step-down circuit has no output.

4. The cell simulator circuit according to claim 3, characterized in that: The step-down chip includes a first serial clock port and a first serial data port, the isolation module includes a primary part and a secondary part, the secondary part includes a second serial clock port and a second serial data port, and the primary part includes a third serial clock port and a third serial data port; The first serial clock port is connected to the second serial clock port, the first serial data port is connected to the second serial data port, and the third serial clock port and the third serial data port are connected to the control module; The third serial clock port and the third serial data port receive the communication signal, the isolation module transmits the communication signal to the second serial clock port and the second serial data port according to the control signal, and the first serial clock port and the first serial data port receive the communication signal; Alternatively, the third serial clock port and the third serial data port receive the communication signal, and the isolation module disconnects the transmission of the communication signal to the second serial clock port and the second serial data port according to the control signal, and the first serial clock port and the first serial data port cannot receive the communication signal.

5. The cell simulator circuit according to claim 1, characterized in that: Also includes: DC-DC conversion module; The DC-DC conversion module is connected to the power supply module, and the DC-DC conversion module converts the power supply voltage output by the power supply module into a third voltage output; The DC-DC conversion module is also connected to the control module and the isolation module. The DC-DC conversion module outputs a third voltage to the control module and the isolation module to provide power for the control module and the isolation module.

6. The cell simulator circuit according to claim 5, characterized in that: The isolation module includes a switch unit and an isolation chip; The control end of the switch unit is connected to the control module, the first end of the switch unit is connected to the DC-DC conversion module, and the second end of the switch unit is connected to the power supply end of the isolation chip; the isolation chip is connected to the control module and the corresponding voltage conversion module; The control module sends the control signal to the switch unit, the control module sends the communication signal to the isolation chip, the switch unit is turned on according to the control signal, the third voltage is transmitted to the power supply terminal of the isolation chip, and the isolation chip transmits the communication signal to the voltage conversion module; Alternatively, the switch unit is disconnected according to the control signal, and the isolation chip disconnects the transmission of the communication signal.

7. The cell simulator circuit according to claim 6, characterized in that: The switch unit includes a first resistor, a second resistor and a first transistor; The first end of the first resistor is connected to the control module, the second end of the first resistor is connected to the first end of the second resistor and the control end of the first transistor, the second end of the second resistor is connected to the first end of the first transistor, and are connected together to the DC-DC conversion module, and the second end of the first transistor is connected to the power supply end of the isolation chip.

8. The cell simulator circuit according to claim 4, characterized in that: The control module comprises: a micro control unit; The micro control unit comprises a fourth serial clock port and a fourth serial data port, the fourth serial clock port is connected to the third serial clock port, and the fourth serial data port is connected to the third serial data port; The fourth serial clock port and the fourth serial data port transmit the communication signal to the third serial clock port and the third serial data port.

9. A battery cell simulator system, characterized in that: The battery cell simulator system comprises the battery cell simulator circuit described in any one of claims 1-8.

10. A control method for a battery cell simulator circuit, characterized in that: The cell simulator circuit includes a power module, a control module, at least one isolation module and at least one voltage conversion module; the isolation module and the voltage conversion module are arranged in a one-to-one correspondence; the isolation module is connected to the control module and the correspondingly arranged voltage conversion module, and the voltage conversion module is connected to the power module; the output end of the voltage conversion module is connected in series with the output end of the adjacent voltage conversion module; the control method includes: The control module sends a control signal and a communication signal to the isolation module, wherein one isolation module transmits the communication signal to the corresponding voltage conversion module according to the control signal, and the voltage conversion module converts the power supply voltage output by the power supply module into a first voltage output according to the communication signal; The remaining isolation modules disconnect the transmission of the communication signal according to the control signal, and the corresponding voltage conversion modules have no output.

Images