Voltage detection circuit

Abstract

The utility model discloses a voltage detection circuit, and relates to the technical field of voltage detection, and the voltage detection circuit comprises a voltage conversion module which is used for converting a received analog signal corresponding to a target voltage of a target battery cell into a target voltage digital quantity; the logic processing module is connected with the voltage conversion module and is used for outputting a target signal to a high-side driving module based on a comparison detection result between a preset threshold value and the target voltage digital quantity; and the high-side driving module is connected with the logic processing module and is used for determining whether external power supply is cut off or not based on the target signal. According to the invention, the problem that the reliability of the battery cell voltage detection and diagnosis protection is poor due to the fact that the battery cell voltage detection and diagnosis protection is realized through different IC functional circuits in the prior art is solved.

Description

Technical Field

[0001] The present application relates to the technical field of voltage detection, and in particular to a voltage detection circuit. Background Art

[0002] Cell voltage detection, diagnosis, and protection are fundamental requirements for battery management systems (BMSs) and essential for ensuring BMS safety and preventing thermal runaway. However, detection, diagnosis, and protection functions are typically implemented by combining multiple ICs, such as one responsible for data acquisition and diagnosis, and another for protection execution. This approach is costly and difficult to design, leading to a high frequency of failures and poor reliability of cell voltage detection, diagnosis, and protection.

[0003] Currently, no effective solution has been proposed to address the problem that the reliability of battery cell voltage detection, diagnosis and protection is poor due to the use of different IC functional circuits in related technologies. Utility Model Content

[0004] The main purpose of the present application is to provide a voltage detection circuit to solve the problem in the related art that the battery cell voltage detection, diagnosis and protection are realized through different IC functional circuits, resulting in poor reliability of the battery cell voltage detection, diagnosis and protection.

[0005] To achieve the above objectives, according to one aspect of the present application, a voltage detection circuit is provided. The voltage detection circuit includes: a voltage conversion module for converting an analog signal corresponding to a target voltage of a target battery cell into a digital value of the target voltage; a logic processing module, connected to the voltage conversion module, for outputting a target signal to a high-side driver module based on a comparison detection result between a preset threshold and the digital value of the target voltage; and the high-side driver module, connected to the logic processing module, for determining whether to cut off external power supply based on the target signal.

[0006] Furthermore, the voltage conversion module also includes: an analog modulation module, connected to the digital filtering module, for modulating the analog signal corresponding to the target voltage to obtain a modulated signal; a digital filtering module, for processing the modulated signal to obtain a target digital signal corresponding to the target voltage; and a digital correction module, connected to the digital filtering module, for obtaining the digital value of the target voltage based on the target digital signal.

[0007] Furthermore, the analog modulation module also includes: a first switch, used to filter and control the voltage received from the target battery cell to input the analog signal corresponding to the target voltage into the analog modulator; the analog modulator is used to modulate the analog signal corresponding to the target voltage to obtain a modulated signal.

[0008] Furthermore, the digital filtering module includes: a digital filter, connected to the analog modulation module, for digitally filtering the modulated signal to obtain an initial digital signal corresponding to the target voltage; a first digital signal processor, connected to the digital filter, for performing average value processing on the initial digital signal to obtain the target digital signal.

[0009] Furthermore, the digital correction module includes: a digital corrector, connected to the digital filtering module, for correcting the target digital signal to obtain a corrected digital signal; a second digital signal processor, connected to the digital corrector, for performing average value processing on the corrected digital signal to obtain a processed digital signal; a second switch, connected to the digital corrector, for filtering and controlling the processed digital signal to obtain the target voltage digital quantity.

[0010] Furthermore, the logic processing module also includes: an electronic buffer for receiving a control signal to drive the logic gate module to operate; the logic gate module is used to output a target signal to the high-side driver module based on a comparison detection result between a preset threshold and the target voltage digital value.

[0011] Furthermore, the logic gate module includes: a serial peripheral interface for receiving the target voltage digital quantity and writing the target voltage digital quantity into a register; the register for storing the target voltage digital quantity; and a logic gate for outputting a target signal to a high-side driver module based on a comparison detection result between a preset threshold and the target voltage digital quantity.

[0012] Furthermore, the logic processing module further includes: a CRC generator, configured to verify the target voltage digital value.

[0013] Furthermore, the voltage detection circuit also includes: a boost module, connected to the high-side driver module and the logic processing module, wherein the logic processing module provides a clock signal to the boost module so that the boost module outputs a preset voltage value to the high-side driver module to drive the high-side driver module to operate based on the preset voltage value.

[0014] Furthermore, the boost module includes: a charge pump for providing the preset voltage value for the high-side driver module based on the clock signal output by the logic processing module; and an undervoltage / overvoltage protection module 401 for protecting the boost module.

[0015] The present application adopts the following device: a voltage conversion module for converting an analog signal corresponding to the target voltage of a target battery cell received into a target voltage digital value; a logic processing module connected to the voltage conversion module for outputting a target signal to a high-side driver module based on a comparison detection result between a preset threshold and the target voltage digital value; and a high-side driver module connected to the logic processing module for determining whether to cut off the external power supply based on the target signal. This solves the problem that the reliability of the battery cell voltage detection and diagnosis protection is poor due to the use of different IC functional circuits in the related art. In this solution, the analog signal corresponding to the voltage of the target battery cell is converted into a target voltage digital value by the voltage conversion module, and then the logic processing module outputs the target signal to the high-side driver module based on the comparison detection result between the preset threshold and the target voltage digital value. Finally, the high-side driver module determines whether to cut off the external power supply based on the target signal. The battery cell voltage detection and diagnosis protection is implemented by integrating the voltage conversion module, the logic processing module and the high-side driver module, thereby achieving the effect of improving the reliability of the battery cell voltage detection and diagnosis protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of this application. The exemplary embodiments and descriptions of this application are intended to explain this application and do not constitute an improper limitation on this application. In the accompanying drawings:

[0017] Figure 1 This is a schematic diagram of a voltage detection circuit provided according to an embodiment of the present application. Figure 1 ;

[0018] Figure 2 This is a schematic diagram of a voltage detection circuit provided according to an embodiment of the present application. Figure 2 ;

[0019] Figure 3 This is a schematic diagram of the voltage conversion module 10 provided according to an embodiment of the present application. Figure 1 ;

[0020] Figure 4 This is a schematic diagram of the voltage conversion module 10 provided according to an embodiment of the present application. Figure 2 ;

[0021] Figure 5 This is a schematic diagram of the voltage conversion module 10 provided according to an embodiment of the present application. Figure 3 ;

[0022] Figure 6 This is a schematic diagram of a voltage detection circuit provided according to an embodiment of the present application. Figure 3 ;

[0023] Figure 7is a schematic diagram of a logic processing module 20 provided according to an embodiment of the present application;

[0024] Figure 8 This is a schematic diagram of a voltage detection circuit provided according to an embodiment of the present application. Figure 4 ;

[0025] Figure 9 This is a schematic diagram of a voltage detection circuit provided according to an embodiment of the present application. Figure 5 ;

[0026] Figure 10 This is a schematic diagram of a voltage detection circuit provided according to an embodiment of the present application. Figure 6 ;

[0027] Figure 11 is a schematic diagram of a booster pump provided according to an embodiment of the present application;

[0028] Among them, 10-voltage conversion module, 20-logic processing module, 30-high-side driver module, 100-analog modulation module, 101-digital filtering module, 102-digital correction module, 1000-first switch, 1001-analog modulator, 1010-digital filter, 1011-first digital signal processor, 1020-digital corrector, 1021-second digital signal processor, 1022-second switch, 200-electronic buffer, 201-logic gate module, 202-CRC generator, 2010-serial peripheral interface, 2011-register, 2012-logic gate, 40-boost module, 400-charge pump, 401-undervoltage / overvoltage protection module. DETAILED DESCRIPTION

[0029] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0030] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention 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 in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0031] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations 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 clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0032] It should be noted that the relevant information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for display and analysis, etc.) involved in this disclosure are all information and data authorized by the user or fully authorized by all parties. For example, an interface is set up between this system and the relevant user or organization. Before obtaining relevant information, it is necessary to send an acquisition request to the aforementioned user or organization through the interface, and obtain the relevant information after receiving the consent information fed back by the aforementioned user or organization.

[0033] The present invention will be described below in conjunction with a preferred implementation device. Figure 1 This is a schematic diagram of a voltage detection circuit provided according to an embodiment of the present application. Figure 1 ,like Figure 1 As shown, the voltage detection circuit includes: a voltage conversion module 10 , a logic processing module 20 and a high-side driver module 30 .

[0034] The voltage conversion module 10 is used to convert the received analog signal corresponding to the target voltage of the target battery cell into a digital value of the target voltage;

[0035] The logic processing module 20 is connected to the voltage conversion module 10 and is used to output a target signal to the high-side driver module 30 based on a comparison detection result between a preset threshold and a target voltage digital value;

[0036] The high-side driver module 30 is connected to the logic processing module 20 and is used to determine whether to cut off the external power supply based on the target signal.

[0037] Alternatively, as Figure 1As shown, the voltage detection circuit provided in the embodiment of the present application includes at least a voltage conversion module 10, a logic processing module 20 and a high-side driver module 30. The voltage conversion module 10 is connected to the logic processing module 20, and the logic processing module 20 is connected to the high-side driver module 30. The analog signal corresponding to the target voltage of the target battery cell is received through the voltage conversion module 10. It should be noted that the voltage of the target battery cell can be collected by a voltage collection device, and then the collected voltage is input to the receiving PIN pin in the voltage conversion module 10. After receiving the analog signal corresponding to the target voltage of the target battery cell, the voltage conversion module 10 discretely quantizes and filters the analog voltage signal to extract the digital signal, and converts the obtained digital quantity into an accurate voltage digital quantity, thereby obtaining the above-mentioned target voltage digital quantity.

[0038] After obtaining the above-mentioned target voltage digital quantity, the voltage conversion module 10 can be transmitted to the logic processing module 20 through the serial peripheral interface (SPI interface). The logic processing module 20 outputs the target signal to the high-side driver module 30 based on the comparison detection result between the preset threshold and the target voltage digital quantity, that is, the logic processing module performs a threshold judgment. According to the threshold judgment result, a response signal is triggered to the high-side driver module 30. The high-side driver module 30 determines whether to cut off the external power supply based on the target signal. For example, when the battery cell voltage value reaches the configuration threshold, the CMD logic control signal of the high-side driver module 30 is triggered to perform a shutdown action, thereby cutting off the external power supply of the battery for protection.

[0039] It should be noted that the CMD logic control signal of the high-side driver module 30 refers to a logic signal for controlling the switching state of the high-side driver. In the application of the high-side driver, these signals can be controlled through an SPI interface or other communication protocols.

[0040] It should be noted that the logic processing module 20 can be implemented by a digital comparator or a voltage detector.

[0041] To sum up, the analog signal corresponding to the voltage of the target battery cell is converted into a target voltage digital quantity through the voltage conversion module, and then the logic processing module outputs the target signal to the high-side driver module based on the comparison detection result between the preset threshold and the target voltage digital quantity. Finally, the high-side driver module determines whether to cut off the external power supply based on the target signal. The battery cell voltage detection diagnosis protection is realized by the integration of the voltage conversion module, the logic processing module and the high-side driver module, thereby achieving the effect of improving the reliability of the battery cell voltage detection diagnosis protection.

[0042] Optionally, in the voltage detection circuit provided in the embodiment of the present application, the voltage conversion module 10 also includes: an analog modulation module 100, connected to the digital filtering module 101, for modulating the analog signal corresponding to the target voltage to obtain a modulated signal; a digital filtering module 101, for processing the modulated signal to obtain a target digital signal corresponding to the target voltage; and a digital correction module 102, connected to the digital filtering module 101, for obtaining a target voltage digital quantity based on the target digital signal.

[0043] In an optional embodiment, if Figure 2 As shown, the voltage conversion module 10 is composed of an analog modulation module 100, a digital filtering module 101 and a digital correction module 102. The analog modulation module 100 is used to modulate the analog signal corresponding to the target voltage to obtain a modulated signal. For example, the analog signal is discretized, and then the digital filtering module 101 filters the discretized signal to extract the digital signal to obtain the target digital signal corresponding to the above-mentioned target voltage. In order to improve the accuracy of the digital signal, the target digital signal is verified and encoded by the digital correction module 102 to obtain an accurate voltage digital quantity. It should be noted that, in an optional embodiment, the digital correction module 102 can verify and encode the digital quantity according to the parameters configured by the NVM, thereby obtaining the above-mentioned target voltage digital quantity.

[0044] The analog modulation module 100 , the digital filtering module 101 and the digital correction module 102 can accurately extract the voltage digital value corresponding to the battery cell.

[0045] Optionally, in the voltage detection circuit provided in the embodiment of the present application, the analog modulation module 100 also includes: a first switch 1000, which is used to filter and control the voltage received from the target battery cell so as to input the analog signal corresponding to the target voltage into the analog modulator 1001; the analog modulator 1001 is used to modulate the analog signal corresponding to the target voltage to obtain a modulated signal.

[0046] In an optional embodiment, if Figure 3As shown, the analog modulation module 100 is composed of a first switch 1000 and an analog modulator 1001. When the voltage collected is input to the PIN pin of the voltage conversion module 10 through the voltage acquisition device, the voltage received from the target battery cell is filtered and controlled by the first switch 1000. It should be noted that the voltage detection circuit provided in the embodiment of the present application can control the voltage detection protection of each cell of the target battery, and the input control of the voltage of each cell can be achieved through the first switch 1000. The first switch 1000 inputs the analog signal corresponding to the controlled target voltage into the analog modulator 1001, and the analog modulator 1001 modulates the analog signal corresponding to the target voltage to obtain a modulated signal. The above device can achieve voltage detection protection for each cell of the target battery.

[0047] Optionally, in the voltage detection circuit provided in the embodiment of the present application, the digital filtering module 101 includes: a digital filter 1010, connected to the analog modulation module 100, for digitally filtering the modulated signal to obtain an initial digital signal corresponding to the target voltage; a first digital signal processor 1011, connected to the digital filter 1010, for performing average value processing on the initial digital signal to obtain a target digital signal.

[0048] In an optional embodiment, if Figure 4 As shown, the digital filtering module 101 is composed of a digital filter 1010 and a first digital signal processor 1011 , wherein the digital filter 1010 is connected to the analog modulation module 100 , and the first digital signal processor 1011 is connected to the digital filter 1010 .

[0049] After the analog modulation module 100 discretely quantizes the analog voltage signal, the modulated signal is input into the digital filter 1010. The digital filter 1010 filters and extracts the digital signal to obtain the aforementioned initial digital signal. The initial digital signal is then input into the first digital signal processor 1011, which performs average processing on the initial digital signal to obtain the target digital signal. The combination of the digital filter 1010 and the first digital signal processor 1011 effectively improves the accuracy of the target digital signal.

[0050] Optionally, in the voltage detection circuit provided in the embodiment of the present application, the digital correction module 102 includes: a digital corrector 1020, connected to the digital filtering module 101, for correcting the target digital signal to obtain a corrected digital signal; a second digital signal processor 1021, connected to the digital corrector 1020, for performing average value processing on the corrected digital signal to obtain a processed digital signal; a second switch 1022, connected to the digital corrector 1020, for filtering and controlling the processed digital signal to obtain a target voltage digital quantity.

[0051] In an optional embodiment, if Figure 5 As shown, the digital correction module 102 consists of a digital corrector 1020, a second digital signal processor 1021 and a second switch 1022, wherein the digital corrector 1020 is connected to the digital filtering module 101, the second digital signal processor 1021 is connected to the digital corrector 1020, and the second switch 1022 is connected to the digital corrector 1020.

[0052] To improve the accuracy of the digital signal, the digital corrector 1020 can perform verification encoding on the digital quantity based on the parameters configured in the NVM to obtain an accurate voltage digital quantity, i.e., a corrected digital signal. The second digital signal processor 1021 then performs average processing on the corrected digital signal to obtain a processed digital signal. It should be noted that since a battery contains multiple cells, i.e., multiple different voltage values, after obtaining the processed digital signal, the second switch 1022 still needs to be set to perform filtering control in order to obtain the above-mentioned target voltage digital quantity.

[0053] In an optional embodiment, a diagnostic module (DIAG) may also be provided in the voltage conversion module 10. The accuracy of the voltage value may be monitored and diagnosed by the DIAG. The DIAG may be used to detect whether the voltage conversion module 10 is operating normally, whether the voltage exceeds a threshold, etc.

[0054] Optionally, in the voltage detection circuit provided in the embodiment of the present application, the logic processing module 20 further includes: an electronic buffer 200, for receiving a control signal to drive the logic gate module 201 to operate; and a logic gate module 201, for outputting a target signal to the high-side driver module 30 based on a comparison detection result between a preset threshold and a target voltage digital value.

[0055] In an optional embodiment, if Figure 6As shown, the logic processing module 20 is composed of an electronic buffer 200 and a logic gate module 201. The electronic buffer 200 is connected to the logic gate module 201 and receives a control signal through the electronic buffer 200 to drive the logic gate module 201. After receiving the drive signal, the logic gate module 201 outputs a target signal to the high-side driver module 30 based on the comparison detection result between the preset threshold and the target voltage digital value.

[0056] Optionally, in the voltage detection circuit provided in the embodiment of the present application, the logic gate module 201 includes: a serial peripheral interface 2010, for receiving a target voltage digital quantity and writing the target voltage digital quantity into a register 2011; a register 2011, for storing the target voltage digital quantity; and a logic gate 2012, for outputting a target signal to the high-side driver module 30 based on a comparison detection result between a preset threshold and the target voltage digital quantity.

[0057] In an optional embodiment, if Figure 7 As shown, the logic gate module 201 is composed of a serial peripheral interface 2010, a register 2011, and a logic gate 2012. The target voltage digital quantity is received through the serial peripheral interface 2010 and written into the register 2011. The logic gate 2012 outputs a target signal to the high-side driver module 30 based on the comparison detection result between the preset threshold and the target voltage digital quantity. That is, the threshold value is judged and the target signal is output to the high-side driver module through the logic gate 2012. For example, when the battery cell voltage reaches the configured threshold, the CMD logic control signal of the high-side driver module is triggered to execute a shutdown action, thereby cutting off the external power supply for protection.

[0058] It should be noted that the high-side driver module 30 is composed of field effect transistors.

[0059] Optionally, in the voltage detection circuit provided in the embodiment of the present application, the logic processing module 20 further includes: a CRC generator 202 for verifying the target voltage digital value.

[0060] In an optional embodiment, if Figure 8 As shown, the logic processing module 20 further includes a CRC generator 202. The CRC (Cyclic Redundancy Check) is used to detect and correct data errors, thereby preventing inaccurate measurements caused by data transmission or storage errors.

[0061] Optionally, in the voltage detection circuit provided in the embodiment of the present application, the voltage detection circuit also includes: a boost module 40, which is connected to the high-side driver module 30 and the logic processing module 20, wherein the logic processing module 20 provides a clock signal to the boost module 40 so that the boost module 40 outputs a preset voltage value to the high-side driver module 30, so as to drive the high-side driver module 30 to operate based on the preset voltage value.

[0062] In an optional embodiment, in order to realize the above-mentioned high-side driving function, a boost module circuit needs to be provided in the voltage detection circuit provided in the embodiment of the present application. Figure 9 As shown, the voltage detection circuit is further provided with a boost module 40, wherein the boost module 40 is connected to the high-side driver module 30 and the logic processing module 20. The logic processing module 20 provides a clock signal to the boost module 40, so that the boost module 40 outputs a preset voltage value to the high-side driver module 30, thereby driving the high-side driver module 30 to operate based on the preset voltage value. It should be noted that the boost module 40 can be a charge pump boost module circuit. The boost module circuit drives the high-side driver module 30 to perform a shutdown action, thereby cutting off the external power supply for protection.

[0063] Optionally, in the voltage detection circuit provided in an embodiment of the present application, the boost module 40 includes: a charge pump 400, which is used to provide a preset voltage value for the high-side driver module 30 based on the clock signal output by the logic processing module 20; and an undervoltage / overvoltage protection module 401, which is used to protect the boost module 40.

[0064] In an optional embodiment, if Figure 10 As shown, the boost module 40 includes a charge pump 400 and an undervoltage / overvoltage protection module 401. The charge pump 400 provides a driving voltage for the high-side driver module 30 based on the clock signal output by the logic processing module 20. The undervoltage / overvoltage protection module 401 is used to protect the boost module 40 in the event of overvoltage or undervoltage.

[0065] In an optional embodiment, if Figure 11 The schematic diagram of the charge pump 400 is shown. The logic processing module outputs the CLKn / CLK switch signal. When the CLKn signal is high and the CLKn switch is closed, the capacitor CP1 is charged to VCP1-V=VV by the V input voltage. Diodes At this time, the voltage of capacitor CP2 to ground is VCP2-GND=V+VCP2-V. Since the voltage value of VCP2-GND is close to 2 times V, capacitor CP2 will charge capacitor CTank to increase the voltage. Diodes is the forward conduction voltage drop of the diode.

[0066] When the CLK signal is high and the CLK switch is closed, the capacitor CP2 is charged to VCP2-V=V-2V by the V input voltage. Diodes At this point, the voltage of capacitor CP1 to ground, VCP1-GND = V + VCP1-V. Since the voltage of VCP1-GND is close to 2 times V, capacitor CP1 will charge capacitor CTank, thereby raising the voltage. Through the logic processing module's continuous output of the CLKn / CLK switching signal, the voltage of capacitor CTank will eventually reach the set voltage value VCP, thereby meeting the chip's internal boost requirement and providing driving voltage for the high-side driver module 30.

[0067] In an optional embodiment, the quantitative reliability analysis method for the voltage detection circuit is implemented as follows:

[0068] (1) Based on the IEC 62380 standard, the overall failure rate of the voltage detection circuit is calculated, and the failure rates of the relevant modules of the voltage detection circuit are decomposed. See Table 1 for details.

[0069] (2) Through DFMEA analysis, a reliability safety measure mechanism is formulated for the failure of the cell voltage acquisition diagnosis and protection function of the voltage detection circuit, such as: SM_01 analog signal self-test comparison, SM_02 CRC check of calibration parameter download, SM_03 independent CRC generator and detection circuit, SM_04 analog multi-channel acquisition switch to digital-to-analog conversion decoding threshold self-test, SM_05 digital-to-analog conversion open circuit diagnosis, SM_06 fault injection self-test, SM_07 digital-to-analog conversion rationality check, SM_08 charging pump over-voltage and under-voltage diagnosis, SM_09 power supply over-voltage and under-voltage diagnosis, SM_10 analog self-test, SM_11 drive comparison self-test. The relevant diagnostic coverage is defined with reference to ISO 26262, as shown in Table 1.

[0070] (3) A quantitative FMEDA analysis of the voltage detection circuit was conducted with reference to the ISO 26262 standard, focusing on the internal components of the voltage detection circuit integrated chip. The failure rate of the components in (1) was diagnosed by applying the measures in (2). The failure rate of the remaining or single-point failure was 0.238734 FIT, and the failure rate of the potential multi-point failure was 0.17130861 FIT. The analysis process is shown in Table 1.

[0071] Table 1

[0072]

[0073]

[0074] The voltage detection circuit provided by the embodiment of the present application, through a voltage conversion module, is used to convert the analog signal corresponding to the target voltage of the target battery cell received into a target voltage digital quantity; a logic processing module is connected to the voltage conversion module and is used to output the target signal to the high-side driver module based on the comparison detection result between the preset threshold and the target voltage digital quantity; the high-side driver module is connected to the logic processing module and is used to determine whether to cut off the external power supply based on the target signal, thereby solving the problem that the battery cell voltage detection diagnosis protection is realized by different IC functional circuits in the related art, resulting in poor reliability of the battery cell voltage detection diagnosis protection. In this solution, the analog signal corresponding to the voltage of the target battery cell is converted into a target voltage digital quantity by the voltage conversion module, and then the logic processing module outputs the target signal to the high-side driver module based on the comparison detection result between the preset threshold and the target voltage digital quantity. Finally, the high-side driver module determines whether to cut off the external power supply based on the target signal. The battery cell voltage detection diagnosis protection is realized by the integration of the voltage conversion module, the logic processing module and the high-side driver module, thereby achieving the effect of improving the reliability of the battery cell voltage detection diagnosis protection.

[0075] The above are merely embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should all be included within the scope of the claims of the present application.

Claims

1. A voltage detection circuit, characterized in that: include: A voltage conversion module (10) is used to convert the received analog signal corresponding to the target voltage of the target battery cell into a digital value of the target voltage; a logic processing module (20), connected to the voltage conversion module (10), and configured to output a target signal to a high-side driver module (30) based on a comparison detection result between a preset threshold value and the target voltage digital value; The high-side driving module (30) is connected to the logic processing module (20) and is used to determine whether to cut off external power supply based on the target signal.

2. The voltage detection circuit according to claim 1, wherein: The voltage conversion module (10) further includes: An analog modulation module (100) is connected to the digital filtering module (101) and is used to modulate the analog signal corresponding to the target voltage to obtain a modulated signal; A digital filtering module (101) is used to process the modulated signal to obtain a target digital signal corresponding to a target voltage; The digital correction module (102) is connected to the digital filtering module (101) and is used to obtain the target voltage digital value based on the target digital signal.

3. The voltage detection circuit according to claim 2, wherein: The analog modulation module (100) further includes: a first switch (1000) for filtering and controlling the voltage received from a target battery cell, so as to input an analog signal corresponding to the target voltage into an analog modulator (1001); The analog modulator (1001) is used to modulate the analog signal corresponding to the target voltage to obtain a modulated signal.

4. The voltage detection circuit according to claim 2, wherein: The digital filtering module (101) comprises: a digital filter (1010), connected to the analog modulation module (100), for performing digital filtering on the modulated signal to obtain an initial digital signal corresponding to the target voltage; The first digital signal processor (1011) is connected to the digital filter (1010) and is used to perform average value processing on the initial digital signal to obtain the target digital signal.

5. The voltage detection circuit according to claim 2, wherein: The digital correction module (102) comprises: A digital corrector (1020), connected to the digital filter module (101), is used to correct the target digital signal to obtain a corrected digital signal; a second digital signal processor (1021), connected to the digital corrector (1020), for performing average processing on the corrected digital signal to obtain a processed digital signal; The second switch (1022) is connected to the digital corrector (1020) and is used to filter and control the processed digital signal to obtain the target voltage digital value.

6. The voltage detection circuit according to claim 1, wherein: The logic processing module (20) further includes: An electronic buffer (200) is used to receive a control signal to drive the logic gate module (201) to operate; The logic gate module (201) is used to output a target signal to the high-side driver module (30) based on a comparison detection result between a preset threshold and the target voltage digital value.

7. The voltage detection circuit according to claim 6, wherein: The logic gate module (201) comprises: A serial peripheral interface (2010) is configured to receive the target voltage digital value and write the target voltage digital value into a register (2011); The register (2011) is used to store the target voltage digital value; The logic gate (2012) is used to output a target signal to the high-side driver module (30) based on a comparison detection result between the preset threshold and the target voltage digital value.

8. The voltage detection circuit according to claim 6, wherein: The logic processing module (20) further includes: The CRC generator (202) is used to check the target voltage digital value.

9. The voltage detection circuit according to any one of claims 1 to 8, characterized in that: The voltage detection circuit further includes: A boost module (40) is connected to the high-side driver module (30) and the logic processing module (20), wherein the logic processing module (20) provides a clock signal to the boost module (40), so that the boost module (40) outputs a preset voltage value to the high-side driver module (30), so as to drive the high-side driver module (30) to operate based on the preset voltage value.

10. The voltage detection circuit according to claim 9, wherein: The boost module (40) comprises: A charge pump (400) is configured to provide the preset voltage value to the high-side driver module (30) based on the clock signal output by the logic processing module (20); An undervoltage / overvoltage protection module (401) is used to protect the boost module (40).

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