Analog front end circuit, device including analog
By using a combination of a temperature signal distributed detection unit and an analog-to-digital conversion unit in the battery module, the temperature signal is directly transmitted, which solves the problem of limited number of temperature acquisition channels, improves the acquisition efficiency and equipment integration, and reduces energy consumption.
Patent Information
- Application Number
- CN202420652372.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-30
- Publication Date
- 2025-01-14
- Estimated Expiration
- 2034-03-30
AI Technical Summary
In existing battery modules, the number of temperature acquisition channels is limited, resulting in the need to add digital isolation equipment when expanding temperature acquisition, resulting in high energy consumption.
The temperature signal is obtained through the temperature signal distributed detection unit and directly transmitted to the analog-to-digital conversion unit to increase the number of analog temperature signal reception ports, reduce energy consumption, and avoid the use of digital isolators.
It improves the scalability and efficiency of temperature signal acquisition, reduces energy consumption, and enhances equipment integration.
Smart Images
Figure CN222356354U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of battery management technology, and in particular to an analog front-end circuit, a device including the analog front-end circuit, and a system. Background Art
[0002] In order to ensure the safety of the battery module during use, a system including an analog front-end circuit is usually provided on the battery module.
[0003] The system including the analog front-end circuit includes a battery information collector (BIC). The BIC collects the voltage and temperature of the single cell and performs balanced control through the analog front-end chip AFE. However, the number of cell voltage collection channels of the integrated chip AFE is much larger than the number of temperature collection channels. In the prior art, in order to ensure the number of temperature collection channels, the battery control unit BCU communication pin is reused to control the analog switch, thereby expanding the temperature collection channel. However, the number of BCU communication pins is limited. When increasing the temperature collection channel, digital isolation equipment needs to be added, resulting in high energy consumption. Utility Model Content
[0004] In view of this, the purpose of the present application is to provide an analog front-end circuit, a device and a system including the analog front-end circuit, so as to obtain the temperature signal through a temperature signal distributed detection unit and directly transmit it to the analog-to-digital conversion unit of the analog front-end circuit, thereby increasing the number of analog temperature signal first receiving ports for collecting temperature signals while reducing energy consumption.
[0005] In a first aspect, the present application provides an analog front-end circuit, comprising:
[0006] An analog-to-digital conversion unit, the analog-to-digital conversion unit comprising a first analog temperature signal receiving port and a digital temperature signal output port, the first analog temperature signal receiving port being connected to the analog temperature signal output port of a temperature signal distributed detection unit, the analog temperature signal output port being used to output the temperature signal received by the second analog temperature signal receiving port of the temperature signal distributed detection unit; a control unit, the control unit comprising a digital temperature signal receiving port, a switching control output port and an information output port, the digital temperature signal receiving port being connected to the digital temperature signal output port, the switching control output port being connected to the control signal input port of the temperature signal distributed detection unit, and the information output port being connected to a controller for outputting temperature signal detection results to the controller.
[0007] Preferably, the analog-to-digital conversion unit also includes an analog voltage signal receiving port and a digital voltage signal output port, and the analog voltage signal receiving port is used to receive a voltage signal; the control unit also includes a digital voltage signal receiving port, and the digital voltage signal receiving port is connected to the digital voltage signal output port, and the information output port is also used to output the voltage signal detection result to the controller.
[0008] Preferably, the controller and the analog front-end circuit are located in the same daisy chain communication link.
[0009] Preferably, the number of the analog temperature signal first receiving ports is M*N, the number of the digital temperature signal output ports is M*N, and the number of the digital temperature signal receiving ports is M*N, where M and N are positive integers; one of the analog temperature signal first receiving ports is connected to one of the analog temperature signal output ports, and one of the digital temperature signal receiving ports is connected to one of the digital temperature signal output ports.
[0010] Preferably, the number of the switching control output ports is M+1, so as to control the temperature signal distributed detection unit to perform at least 2M-1 switching operations of switching the analog temperature signal output ports.
[0011] Preferably, the temperature signal distributed detection unit comprises M analog switches, each of which integrates 2N analog temperature signal second receiving ports and N analog temperature signal output ports.
[0012] Preferably, the analog front-end circuit also includes a first power supply unit and a second power supply unit; the first power supply unit includes a first power supply and multiple first resistors, and a single switching control output port is connected to the first power supply through at least one first resistor; the second power supply unit includes a second power supply and multiple second resistors, and a single analog temperature signal first receiving port is connected to the second power supply through at least one second resistor.
[0013] Preferably, the number of the analog voltage signal receiving ports is 2*M*N; the number of the digital voltage signal output ports is 2*M*N; the number of the digital voltage signal receiving ports is 2*M*N, and one digital voltage signal receiving port is connected to one digital voltage signal output port.
[0014] In a second aspect, an embodiment of the present application provides a device including an analog front-end circuit, including the analog front-end circuit as described in the first aspect, and also including a signal amplification unit and a signal filtering unit; the input end of the signal amplification unit is connected to the analog temperature signal output port of the temperature signal distributed detection unit, the output end of the signal amplification unit is connected to the input end of the signal filtering unit, and the output end of the signal filtering unit is connected to the analog-to-digital conversion unit of the analog front-end circuit.
[0015] Preferably, the signal amplification unit, the signal filtering unit, the analog-to-digital conversion unit of the analog front-end circuit and the control unit of the analog front-end circuit are integrated into an analog front-end AFE chip; the device including the analog front-end circuit includes a plurality of the analog front-end AFE chips, a single analog front-end AFE chip is used to collect the voltage signal and temperature signal of each battery cell in the M*N battery cells of a single battery pack, and the two battery packs corresponding to any two analog front-end chips are different.
[0016] In a third aspect, an embodiment of the present application provides a system including an analog front-end circuit, comprising multiple battery packs, a device including an analog front-end circuit as described in the second aspect, and a battery control unit BCU, wherein the battery control unit BCU is connected to the device including the analog front-end circuit via dual communication lines.
[0017] It can be seen that in the present application, the temperature signal distributed detection unit of the analog front-end circuit receives the analog temperature signal through the analog temperature signal second receiving port, and outputs the analog temperature signal to the analog-to-digital conversion unit through the analog temperature signal output port, and after conversion by the analog-to-digital conversion unit, it is output to the control unit through the digital temperature signal output port of the analog-to-digital conversion unit. In the present application, a temperature signal distributed detection unit is used to obtain the temperature signal to improve scalability; and the temperature signal is directly transmitted to the analog-to-digital conversion unit of the analog front-end circuit, and the control unit of the analog front-end circuit directly controls the temperature signal distributed detection unit for switching control, without the need to multiplex the communication port of the controller for control, thereby avoiding the use of devices such as digital isolators and saving energy. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0019] Figure 1 It is a structural schematic diagram of an analog front-end circuit provided in an embodiment of the present application;
[0020] Figure 2 It is a structural schematic diagram of a temperature signal distributed detection unit provided in an embodiment of the present application;
[0021] Figure 3 This is a port diagram of an analog-to-digital conversion unit and a control unit provided in an embodiment of the present application;
[0022] Figure 4 This is a specific implementation step diagram of an analog front-end circuit obtaining a temperature signal provided by an embodiment of the present application;
[0023] Figure 5 It is a structural schematic diagram of an analog front-end AFE chip provided in an embodiment of the present application;
[0024] Figure 6 This is a schematic diagram of a connection between a device including an analog front-end circuit and a battery control unit BCU provided in an embodiment of the present application;
[0025] Figure 7 It is a connection diagram of another device including an analog front-end circuit and a battery control unit BCU provided in an embodiment of the present application;
[0026] Figure 8 This is a connection diagram of a device including an analog front-end circuit, a battery pack and a battery control unit BCU provided in an embodiment of the present application;
[0027] Fig. 9 It is a structural diagram of a system including an analog front-end circuit provided in an embodiment of the present application. DETAILED DESCRIPTION
[0028] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.
[0029] The terms "first", "second", etc. in the specification and claims of this application and the above drawings are used to distinguish different objects rather than to describe a specific order. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusions.
[0030] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.
[0031] The embodiments of the present application are described below with reference to the accompanying drawings.
[0032] See also Figure 1 , Figure 1 1 is a schematic diagram of the structure of an analog front-end circuit provided in an embodiment of the present application. Figure 1 An analog front-end circuit shown includes: an analog-to-digital conversion unit, the analog-to-digital conversion unit includes an analog temperature signal first receiving port and a digital temperature signal output port, the analog temperature signal first receiving port is connected to the analog temperature signal output port of the temperature signal distributed detection unit, and the analog temperature signal output port is used to output the temperature signal received by the analog temperature signal second receiving port of the temperature signal distributed detection unit;
[0033] A control unit, the control unit comprising a digital temperature signal receiving port, a switching control output port and an information output port, the digital temperature signal receiving port being connected to the digital temperature signal output port, the switching control output port being connected to the control signal input port of the temperature signal distributed detection unit, and the information output port being connected to a controller for outputting temperature signal detection results to the controller.
[0034] The analog-to-digital conversion unit may be an analog-to-digital converter (ADC), which is used to convert analog signals into digital signals for digital processing by other devices. The control unit may be used to configure and control the working state of each functional unit, such as the sampling rate and resolution of the ADC, and the control unit may be a microprocessor MCU, etc. In this application, the analog front-end circuit may be an analog front-end AFE chip for example.
[0035] The controller can be a battery control unit BCU. The controller and the analog front-end circuit are located in the same daisy chain communication link. The controller and the analog front-end circuit communicate through a daisy chain communication method. Specifically, the controller is connected to the information output port of the analog front-end circuit to receive voltage signal detection results and temperature signal detection results.
[0036] The temperature signal distributed detection unit includes a second analog temperature signal receiving port and an analog temperature signal output port; the analog-to-digital conversion unit includes a first analog temperature signal receiving port and a digital temperature signal output port.
[0037] Specifically, the analog temperature signal output port of the temperature signal distributed detection unit is connected to the analog temperature signal first receiving port of the analog-to-digital conversion unit, so that the analog-to-digital conversion unit can receive the temperature signal collected by the temperature signal distributed detection unit. The digital temperature signal output port of the analog-to-digital conversion unit is connected to the digital temperature signal receiving port of the control unit, so that the control unit can receive the digital temperature signal obtained after the analog-to-digital conversion unit converts it. Then, the control unit outputs the temperature signal detection result through the information output port.
[0038] It can be seen that in this example, the temperature signal distributed detection unit transmits the temperature signal to the analog-to-digital conversion unit, and the analog-to-digital conversion unit transmits the temperature signal to the controller, avoiding the use of devices such as digital isolators, saving resources and energy consumption, and making the device more integrated. In addition, the temperature signal of the battery pack is directly collected through the temperature signal distributed detection unit, expanding the temperature signal collection channel, and having high scalability.
[0039] In a possible example, the analog-to-digital conversion unit also includes an analog voltage signal receiving port and a digital voltage signal output port, and the analog voltage signal receiving port is used to receive a voltage signal; the control unit also includes a digital voltage signal receiving port, and the digital voltage signal receiving port is connected to the digital voltage signal output port, and the information output port is also used to output the voltage signal detection result to the controller.
[0040] Among them, the control unit includes a digital voltage signal receiving port, the analog-to-digital conversion unit includes an analog voltage signal receiving port and a digital voltage signal output port, and the digital voltage signal output port of the analog-to-digital conversion unit is connected to the digital voltage signal receiving port of the control unit, so that the control unit receives the digital voltage signal converted from the analog-to-digital conversion unit, and then outputs the voltage signal detection result to the controller through the information output port.
[0041] It can be seen that in this example, the temperature signal can be detected while the voltage signal is detected through the analog-to-digital conversion unit, thereby improving the detection efficiency.
[0042] In a possible example, the controller and the analog front-end circuit are located in the same daisy chain communication link.
[0043] Among them, the analog front-end circuit and the connected controller are in the same daisy chain communication link, which improves scalability.
[0044] In one possible example, the number of the analog temperature signal first receiving ports is M*N, the number of the digital temperature signal output ports is M*N, and the number of the digital temperature signal receiving ports is M*N, where M and N are positive integers; one of the analog temperature signal first receiving ports is connected to one of the analog temperature signal output ports, and one of the digital temperature signal receiving ports is connected to one of the digital temperature signal output ports.
[0045] In a specific example, the number of the first receiving ports of the analog temperature signal is M*N. To ensure that the analog-to-digital conversion unit can fully receive the temperature signal transmitted by the temperature signal distributed detection unit, the same number of analog temperature signal output ports and analog temperature signal first receiving ports need to be set. For example, if M*N analog temperature signal output ports are set, M*N analog temperature signal first receiving ports need to be set, where M and N are positive integers. Specifically, N is the number of pins of the analog-to-digital conversion unit.
[0046] Specifically, one pin of the analog-to-digital conversion unit can be set to multiple analog temperature signal first receiving ports. Figure 2 and Figure 3 , Figure 2 is a schematic diagram of the structure of a temperature signal distributed detection unit provided in an embodiment of the present application, Figure 3 It is a port schematic diagram of an analog-to-digital conversion unit and a control unit provided in an embodiment of the present application. If the analog-to-digital conversion unit includes four pins, they are: a first pin 211, a second pin 212, a third pin 213 and a fourth pin 214. The temperature signal distributed detection unit includes two analog switches, namely analog switch 1 and analog switch 2; analog switch 1 includes 4 analog temperature signal output ports, namely: a first analog temperature signal output port 121, a second analog temperature signal output port 122, a third analog temperature signal output port 123 and a fourth analog temperature signal output port 124; analog switch 2 includes 4 analog temperature signal output ports, namely: a fifth analog temperature signal output port 125, a sixth analog temperature signal output port 126, a seventh analog temperature signal output port 127 and an eighth analog temperature signal output port 128.
[0047] Among them, the first pin 211 of the analog-to-digital conversion unit can be set with two analog temperature signal first receiving ports, which are respectively connected to the first analog temperature signal output port 121 and the fifth analog temperature signal output port 125; similarly, the second pin 212 can be set with two analog temperature signal first receiving ports, which are respectively connected to the second analog temperature signal output port 122 and the sixth analog temperature signal output port 126; the third pin 213 can be set with two analog temperature signal first receiving ports, which are respectively connected to the third analog temperature signal output port 123 and the seventh analog temperature signal output port 127; the fourth pin 214 can be set with two analog temperature signal first receiving ports, which are respectively connected to the fourth analog temperature signal output port 124 and the eighth analog temperature signal output port 128. Therefore, the analog-to-digital conversion unit can be connected to more analog switches to improve the detection range.
[0048] It can be seen that in this example, by setting the same number of analog temperature signal output ports and analog temperature signal first receiving ports, data receiving efficiency is improved and data integrity is ensured. In addition, multiple analog temperature signal first receiving ports are set on the same pin to improve resource utilization.
[0049] In a possible example, the temperature signal distributed detection unit includes M analog switches, each of which integrates 2N analog temperature signal second receiving ports and N analog temperature signal output ports.
[0050] In a specific example, the temperature signal distributed detection unit includes M analog switches, where M is a positive integer. Each analog switch integrates 2N analog temperature signal second receiving ports and N analog temperature signal output ports, where N is a positive integer. Figure 2 , Figure 2 It is a structural schematic diagram of a temperature signal distributed detection unit provided in an embodiment of the present application. For example, if N is 4, the analog switch includes 4 analog temperature signal output ports and 8 analog temperature signal second receiving ports. If M is 2, the temperature signal distributed detection unit includes analog switch 1 and analog switch 2. The power supply VDD port of analog switch 1 is connected to the third power supply VDD, and the ground GND port of analog switch 1 is grounded; the power supply VDD port of analog switch 2 is connected to the fourth power supply VDD, and the ground GND port of analog switch 2 is grounded. Thus, the third power supply VDD and the fourth power supply VDD are used to power analog switch 1 and analog switch 2, respectively.
[0051] It can be seen that in this example, multiple analog switches are set in the temperature signal distributed detection unit, and the number of analog temperature signal second receiving ports of each analog switch is greater than the number of analog temperature signal output ports, thereby increasing the ports for collecting temperature signals and thereby increasing the detectable range.
[0052] In a possible example, the number of the switching control output ports is M+1, so as to control the temperature signal distributed detection unit to perform at least 2M-1 switching operations of switching the analog temperature signal output ports.
[0053] In a specific example, the control unit also includes M+1 switching control output ports, and the switching control output ports are connected to the control signal input port of the temperature signal distributed detection unit. Each analog switch in the temperature signal distributed detection unit is connected to two switching control output ports, and one switching control output port controls the switching between different analog switches, that is, controls the time when different analog switches collect temperature signals, so that the analog-to-digital conversion unit receives the temperature signals collected by different analog switches at staggered times, so that the analog-to-digital conversion unit can connect more analog switches when the pins are limited. Another switching control output port controls the switching of the internal connection port of a single analog switch, so that one analog switch can detect more batteries. For example, please refer again Figure 2 and Figure 3 ,like Figure 2 and Figure 3 As shown, if the control unit includes 3 pins and the analog-to-digital conversion unit includes 4 pins, then N is 4 and M is 2, so it includes 8 analog temperature signal first receiving ports, and two analog switches are correspondingly set, each analog switch includes 4 analog temperature signal output ports and 8 analog temperature signal second receiving ports.
[0054] Specifically, the four pins of the analog-to-digital conversion unit are: a first pin 211, a second pin 212, a third pin 213 and a fourth pin 214. The temperature signal distributed detection unit includes two analog switches, namely analog switch 1 and analog switch 2; analog switch 1 includes 4 analog temperature signal output ports, namely: a first analog temperature signal output port 121, a second analog temperature signal output port 122, a third analog temperature signal output port 123 and a fourth analog temperature signal output port 124. Analog switch 2 includes 4 analog temperature signal output ports, namely: a fifth analog temperature signal output port 125, a sixth analog temperature signal output port 126, a seventh analog temperature signal output port 127 and an eighth analog temperature signal output port 128. Among them, the first pin 211 of the analog-to-digital conversion unit can be set with two analog temperature signal first receiving ports, which are respectively connected to the first analog temperature signal output port 121 and the fifth analog temperature signal output port 125; similarly, the second pin 212 can be set with two analog temperature signal first receiving ports, which are respectively connected to the second analog temperature signal output port 122 and the sixth analog temperature signal output port 126; the third pin 213 can be set with two analog temperature signal first receiving ports, which are respectively connected to the third analog temperature signal output port 123 and the seventh analog temperature signal output port 127; the fourth pin 214 can be set with two analog temperature signal first receiving ports, which are respectively connected to the fourth analog temperature signal output port 124 and the eighth analog temperature signal output port 128.
[0055] The three pins of the control unit correspond to three switch control output ports, namely: a first switch control output port 341 , a second switch control output port 342 , and a third switch control output port 343 .
[0056] The first analog switch includes a first control signal input port 131 and a second control signal input port 132 , and the second analog switch includes a third control signal input port 133 and a fourth control signal input port 134 .
[0057] The first switching control output port 341 is connected to the second control signal input port 132; the first switching control output port 341 is also connected to the fourth control signal input port 134; the second switching control output port 342 is connected to the first control signal input port 131; the third switching control output port 343 is connected to the third control signal input port 133, so that the analog switch can be switched.
[0058] For details, please refer to Figure 4 , Figure 4 1 is a specific implementation step diagram of an analog front-end circuit for obtaining a temperature signal provided by an embodiment of the present application. Figure 4As shown, the second switch control output port 342 is set to a low level, the first switch control output port 341 is set to a high level, and the third switch control output port 343 is set to a high level. At this time, the analog switch 1 is low level, IN is high level, then the 1A, 2A, 3A and 4A ports in analog switch 1 are connected to the 1B2, 2B2, 3B2 and 4B2 ports respectively, to obtain the temperature signals of TS2, TS4, TS6 and TS8, where TS2, TS4, TS6 and TS8 are battery temperature detection points. Among them, a single battery temperature detection point is a single temperature sensor access point, and each temperature sensor can include a negative temperature coefficient thermistor. By connecting the temperature sensor, it is connected in series with the negative temperature coefficient thermistor. The resistance of the negative temperature coefficient thermistor decreases according to the increase of temperature, so that the voltage changes, and then the temperature signal is determined according to the voltage of the negative temperature coefficient thermistor.
[0059] Similarly, the second switch control output port 342 is set to a low level, the first switch control output port 341 is set to a low level, and the third switch control output port 343 is set to a high level. If it is low level and IN is low level, the 1A, 2A, 3A and 4A ports in analog switch 1 are connected to the 1B1, 2B1, 3B1 and 4B1 ports respectively to obtain the temperature signals of TS1, TS3, TS5 and TS7, where TS1, TS3, TS5 and TS7 are battery temperature detection points.
[0060] Similarly, the second switch control output port 342 is set to a high level, the first switch control output port 341 is set to a high level, and the third switch control output port 343 is set to a low level. If IN is low and IN is high, ports 5A, 6A, 7A and 8A in analog switch 2 are connected to ports 5B2, 6B2, 7B2 and 8B2 respectively to obtain temperature signals of TS10, TS12, TS14 and TS16, where TS10, TS12, TS14 and TS16 are battery temperature detection points.
[0061] Similarly, the second switch control output port 342 is set to a high level, the first switch control output port 341 is set to a low level, and the third switch control output port 343 is set to a low level. If IN is low, the 5A, 6A, 7A and 8A ports in analog switch 2 are connected to the 5B1, 6B1, 7B1 and 8B1 ports respectively to obtain the temperature signals of TS9, TS11, TS13 and TS15, among which TS9, TS11, TS13 and TS15 are battery temperature detection points.
[0062] Please refer to Table 1. As shown in Table 1, when analog switch 1 and analog switch 2 are When it is high level and IN is any level, the internal connection ports of analog switch 1 and analog switch 2 are not connected and are in a floating state. The details are as follows: Table 1:
[0063]
[0064] Among them, since there are M analog switches, each analog switch can be switched twice to obtain two different battery temperature signals, so it is necessary to perform 2M-1 switching operations of the analog temperature signal output port so that the analog-to-digital conversion unit can receive the temperature signals of all connected batteries. For example, the control unit includes 3 switching control output ports, and the analog-to-digital conversion unit has 4 pins. To ensure the stability of control, 2 analog switches can be provided, and each analog switch includes 4 analog temperature signal output ports. In order to increase the number of detectable batteries, each analog switch can be provided with 8 analog temperature signal second receiving ports to receive temperature signals, so each analog switch can be connected to 8 batteries, and each switching can provide temperature signals of 4 batteries. After 3 switching operations, the temperature signals of 16 batteries can be obtained.
[0065] It can be seen that in this example, the switching operation is controlled by switching the output level signal of the control output port, which reduces the control difficulty, increases the number of detectable items, and makes the detection result more comprehensive, so the credibility is higher.
[0066] In a possible example, the analog front-end circuit also includes a first power supply unit and a second power supply unit; the first power supply unit includes a first power supply VDD and multiple first resistors, and a single switching control output port is connected to the first power supply VDD through at least one first resistor; the second power supply unit includes a second power supply VCC and multiple second resistors, and a single analog temperature signal first receiving port is connected to the second power supply VCC through at least one second resistor.
[0067] In the specific example, please combine Figure 3 ,like Figure 3As shown, the analog front-end circuit also includes a first power supply unit and a second power supply unit. The first power supply unit includes a first power supply VDD and a plurality of first resistors, for example, including a first resistor R1, a second resistor R2, and a third resistor R3. The first switching control output port 341 of the control unit is connected to the first power supply VDD through the first resistor R1; the second switching control output port 342 of the control unit is connected to the first power supply VDD through the second resistor R2; the third switching control output port 343 of the control unit is connected to the first power supply VDD through the third resistor R3. The second power supply unit includes a second power supply VCC and a plurality of second resistors, for example, including a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, and an eleventh resistor R11. The first pin 211 of the analog-to-digital conversion unit is connected to the second power supply VCC through the fourth resistor R4 and the fifth resistor R5, wherein the fourth resistor R4 and the fifth resistor R5 are connected in series; the second pin 212 of the analog-to-digital conversion unit is connected to the second power supply VCC through the sixth resistor R6 and the seventh resistor R7, wherein the sixth resistor R6 and the seventh resistor R7 are connected in series; the third pin 213 of the analog-to-digital conversion unit is connected to the second power supply VCC through the eighth resistor R8 and the ninth resistor R9, wherein the eighth resistor R8 and the ninth resistor R9 are connected in series; the fourth pin 214 of the analog-to-digital conversion unit is connected to the second power supply VCC through the tenth resistor R10 and the eleventh resistor R11, wherein the tenth resistor R10 and the eleventh resistor R11 are connected in series. The first receiving port of the analog temperature signal of the analog-to-digital conversion unit is set on the pin, so the first receiving port of the analog temperature signal is connected to the second power supply VCC through at least one second resistor. Specifically, the first pin 211 of the analog-to-digital conversion unit, the second pin 212 of the analog-to-digital conversion unit, the third pin 213 of the analog-to-digital conversion unit and the fourth pin 214 of the analog-to-digital conversion unit are also grounded through capacitors C1, C2, C3 and C4 respectively.
[0068] It can be seen that in this example, the control unit and the analog-to-digital conversion unit are powered by independent power supplies, thereby improving circuit stability and safety.
[0069] In a possible example, the number of the analog voltage signal receiving ports is 2*M*N; the number of the digital voltage signal output ports is 2*M*N; the number of the digital voltage signal receiving ports is 2*M*N, and one digital voltage signal receiving port is connected to one digital voltage signal output port.
[0070] In a specific example, there are 2*M*N analog voltage signal receiving ports and 2*M*N digital voltage signal output ports; there are 2*M*N digital voltage signal receiving ports, and one digital voltage signal receiving port is connected to one digital voltage signal output port.
[0071] It can be seen that in this example, a digital voltage signal receiving port is connected to a digital voltage signal output port to improve the voltage signal transmission efficiency, and the number of analog voltage signal receiving ports is 2*M*N, and the number of collectible voltage signals is the same as the number of collectible temperature signals, realizing 1:1 signal collection.
[0072] In one possible example, see Figures 5 to 8 , Figure 5 It is a structural schematic diagram of an analog front-end AFE chip provided in an embodiment of the present application; Figure 6 This is a schematic diagram of a connection between a device including an analog front-end circuit and a battery control unit BCU provided in an embodiment of the present application; Figure 7 It is a connection diagram of another device including an analog front-end circuit and a battery control unit BCU provided in an embodiment of the present application; Figure 8 1 is a schematic diagram of a device including an analog front-end circuit, a battery pack and a battery control unit BCU provided in an embodiment of the present application. Figure 5 , Figure 6 and Figure 7 As shown, the present application also provides a device including an analog front-end circuit, including the analog front-end circuit as described above, and also including a signal amplification unit and a signal filtering unit; the input end of the signal amplification unit is connected to the analog temperature signal output port of the temperature signal distributed detection unit, the output end of the signal amplification unit is connected to the input end of the signal filtering unit, and the output end of the signal filtering unit is connected to the analog-to-digital conversion unit of the analog front-end circuit. The signal amplification unit, the signal filtering unit, the analog-to-digital conversion unit of the analog front-end circuit and the control unit of the analog front-end circuit are integrated into an analog front-end AFE chip; the device including the analog front-end circuit includes a plurality of the analog front-end AFE chips, a single analog front-end AFE chip is used to collect the voltage signal and temperature signal of each of the M*N battery cells of a single battery pack, and the two battery packs corresponding to any two analog front-end chips are different from each other.
[0073] Specifically, the device including the analog front-end circuit also includes a signal amplification unit and a signal filtering unit, such as Figure 5 As shown, the analog front-end circuit can also integrate a signal amplification unit and a signal filtering unit, that is, the analog front-end AFE chip includes a signal amplification unit, a signal filtering unit, an analog-to-digital conversion unit and a control unit. Among them, the input end of the signal amplification unit is connected to the analog temperature signal output port of the temperature signal distributed detection unit, the output end of the signal amplification unit is connected to the input end of the signal filtering unit, the output end of the signal filtering unit is connected to the analog-to-digital conversion unit of the analog front-end circuit, and the analog-to-digital conversion unit is connected to the control unit.
[0074] The device including the analog front-end circuit may include multiple analog front-end AFE chips, see Figure 8 , multiple analog front-end AFE chips and multiple temperature signal distributed detection units are arranged in each device including an analog front-end circuit, one end of each analog front-end AFE chip is connected to a battery pack through a temperature signal distributed detection unit to collect the temperature signal of the battery pack, and directly connected to the battery pack to obtain the voltage signal of the battery pack. The other end of the analog front-end AFE chip is connected to the battery control unit BCU through an information output port, the analog front-end AFE chip is connected to the battery control unit BCU through a twisted pair, and multiple analog front-end AFE chips form a daisy chain communication link with the battery control unit BCU, and the analog front-end AFE chip communicates with the battery control unit BCU through a twisted pair daisy chain communication method, thereby improving scalability, thereby increasing the number of obtainable temperature signals and voltage signals. And it can be directly transmitted to the battery control unit BCU, and avoids the use of digital isolators, reducing energy consumption.
[0075] It can be seen that in this example, a plurality of analog front-end AFE chips and a plurality of temperature signal distributed detection units can be arranged in the device including the analog front-end circuit to increase the number of detectable batteries, and a daisy chain communication link is used for communication to improve scalability.
[0076] In one possible example, see Fig. 9 , Fig. 9 The present invention provides a schematic diagram of a system including an analog front-end circuit according to an embodiment of the present invention. A system including an analog front-end circuit includes a plurality of battery packs, a device including an analog front-end circuit as described above, and a battery control unit BCU, wherein the battery control unit BCU is connected to the device including the analog front-end circuit via dual communication lines.
[0077] Specifically, the system including the analog front-end circuit includes multiple battery packs, the device including the analog front-end circuit as described above, a battery control unit BCU and dual communication lines, and one end of a device including the analog front-end circuit is connected to at least one battery pack, and the other end is connected to the battery control unit BCU. The temperature signal of the battery pack is obtained through the temperature signal distributed detection unit, and is directly transmitted to the analog front-end AFE chip for processing, and then transmitted to the battery control unit BCU, avoiding occupying the pins of the battery control unit BCU and saving resources. The analog front-end AFE chip transmits to the battery control unit BCU through dual communication lines, without the need to set up a digital isolator, saving energy consumption. In addition, the analog front-end AFE chip and the battery control unit BCU are located in the same daisy chain, and the analog front-end AFE chip and the battery control unit BCU communicate using a daisy chain communication link to improve scalability.
[0078] The embodiments of the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for those skilled in the art, according to the idea of the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.
[0079] Although the present application is disclosed as above, the present application is not limited thereto. Any person skilled in the art can easily think of changes or substitutions without departing from the spirit and scope of the present application, and can make various changes and modifications, including the combination of the above-mentioned different functions and implementation steps, including software and hardware implementation methods, all of which are within the scope of protection of the present application.
Claims
1. An analog front-end circuit, characterized in that: include: An analog-to-digital conversion unit, the analog-to-digital conversion unit comprising an analog temperature signal first receiving port and a digital temperature signal output port, the analog temperature signal first receiving port being connected to the analog temperature signal output port of the temperature signal distributed detection unit, the analog temperature signal output port being used to output the temperature signal received by the analog temperature signal second receiving port of the temperature signal distributed detection unit; A control unit, the control unit comprising a digital temperature signal receiving port, a switching control output port and an information output port, the digital temperature signal receiving port being connected to the digital temperature signal output port, the switching control output port being connected to the control signal input port of the temperature signal distributed detection unit, and the information output port being connected to a controller for outputting temperature signal detection results to the controller.
2. The analog front-end circuit according to claim 1, characterized in that: The analog-to-digital conversion unit further includes an analog voltage signal receiving port and a digital voltage signal output port, wherein the analog voltage signal receiving port is used to receive a voltage signal; The control unit further includes a digital voltage signal receiving port, the digital voltage signal receiving port is connected to the digital voltage signal output port, and the information output port is also used to output the voltage signal detection result to the controller.
3. The analog front-end circuit according to claim 2, characterized in that: The controller and the analog front end circuit are located in the same daisy chain communication link.
4. The analog front-end circuit according to claim 3, characterized in that: The number of the analog temperature signal first receiving ports is M*N, the number of the digital temperature signal output ports is M*N, and the number of the digital temperature signal receiving ports is M*N, where M and N are positive integers; One of the analog temperature signal first receiving ports is connected to one of the analog temperature signal output ports, and one of the digital temperature signal receiving ports is connected to one of the digital temperature signal output ports.
5. The analog front-end circuit according to claim 3, characterized in that: The number of the switching control output ports is M+1, so as to control the temperature signal distributed detection unit to perform at least 2M-1 switching operations of switching the analog temperature signal output ports.
6. The analog front-end circuit according to claim 3, characterized in that: The temperature signal distributed detection unit includes M analog switches, each of which integrates 2N analog temperature signal second receiving ports and N analog temperature signal output ports.
7. The analog front-end circuit according to any one of claims 1 to 6, characterized in that: The analog front-end circuit also includes a first power supply unit and a second power supply unit; The first power supply unit includes a first power supply and a plurality of first resistors, and a single switching control output port is connected to the first power supply via at least one first resistor; The second power supply unit includes a second power supply and a plurality of second resistors, and a single first receiving port for the analog temperature signal is connected to the second power supply via at least one second resistor.
8. The analog front-end circuit according to any one of claims 2 to 6, characterized in that: The number of the analog voltage signal receiving ports is 2*M*N; the number of the digital voltage signal output ports is 2*M*N; the number of the digital voltage signal receiving ports is 2*M*N, and one digital voltage signal receiving port is connected to one digital voltage signal output port.
9. A device comprising an analog front-end circuit, characterized in that: The analog front-end circuit comprises the analog front-end circuit according to any one of claims 1 to 8, and further comprises a signal amplification unit and a signal filtering unit; The input end of the signal amplifying unit is connected to the analog temperature signal output port of the temperature signal distributed detection unit, the output end of the signal amplifying unit is connected to the input end of the signal filtering unit, and the output end of the signal filtering unit is connected to the analog-to-digital conversion unit of the analog front-end circuit.
10. The device comprising an analog front-end circuit according to claim 9, characterized in that: The signal amplifying unit, the signal filtering unit, the analog-to-digital conversion unit of the analog front-end circuit and the control unit of the analog front-end circuit are integrated into an analog front-end AFE chip; The device including the analog front-end circuit includes multiple analog front-end AFE chips, and a single analog front-end AFE chip is used to collect the voltage signal and temperature signal of each battery cell in the M*N battery cells of a single battery pack. The two battery packs corresponding to any two analog front-end chips are different.
11. A system comprising an analog front end circuit, characterized in that: It comprises a plurality of battery packs, a device comprising an analog front-end circuit as claimed in claim 9, and a battery control unit BCU, wherein the battery control unit BCU is connected to the device comprising an analog front-end circuit via dual communication lines.