High-voltage sampling circuit and vehicle

Abstract

The utility model relates to a high-voltage sampling circuit and a vehicle, and relates to the technical field of electric vehicles. The high-voltage sampling circuit is applied to a vehicle power battery system at least comprising a first relay. The high-voltage sampling circuit comprises a voltage dividing module which is electrically connected to the two ends of a first relay so as to divide the high voltage at the two ends of the first relay to obtain a first divided voltage and a second divided voltage; the isolation module is electrically connected to the voltage dividing module so as to receive the first divided voltage and the second divided voltage; the MCU is integrated with an analog-to-digital converter (ADC) function and at least comprises a first ADC module; the isolation module is electrically connected with the first ADC module to transmit the first partial voltage and the second partial voltage to the MCU so as to perform voltage sampling on the two ends of the first relay; the isolation module is configured to provide electrical isolation for the MCU. According to the invention, the sampling rate is high, and the instantaneous voltage jump is collected.

Description

Technical Field

[0001] This disclosure relates to the field of electric vehicle technology, and more particularly to a high-voltage sampling circuit and vehicle. Background Technology

[0002] When an electric vehicle is running, multiple relays are installed in the high-voltage circuit of the battery system to ensure the power-on and safe disconnection of the high-voltage circuit, and voltage sampling points are arranged at both ends of the relays to diagnose the status of the relays.

[0003] In related technologies, such as Figure 1 As shown, a voltage divider network (R11 to R110) and an analog front-end ADC chip are used to sample high-voltage points. The data is then relayed back to the MCU (Microcontroller Unit) via daisy-chain communication to determine the voltage difference between the sampled points, thus diagnosing the open and closed states of the relay contacts. The sampling rate is limited by the daisy-chain or interface communication; a low sampling rate may prevent the acquisition of instantaneous voltage jumps.

[0004] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0005] This disclosure provides a high-voltage sampling circuit and a vehicle.

[0006] According to a first aspect of the present disclosure, a high-voltage sampling circuit is provided, the high-voltage sampling circuit being applied to a vehicle power battery system, the vehicle power battery system including at least a first relay;

[0007] The high-voltage sampling circuit includes:

[0008] A voltage divider module is electrically connected to both ends of the first relay to divide the high voltage across the first relay to obtain a first voltage divider and a second voltage divider.

[0009] An isolation module, electrically connected to the voltage divider module, is provided to receive the first voltage divider and the second voltage divider.

[0010] A microcontroller unit (MCU) is provided, wherein the MCU integrates an analog-to-digital converter (ADC) function; the MCU includes at least a first ADC module.

[0011] The isolation module is electrically connected to the first ADC module to transmit the first voltage divider and the second voltage divider to the MCU, so that the MCU samples the voltage across the first relay.

[0012] The isolation module is configured to provide electrical isolation for the MCU.

[0013] In some embodiments of the present disclosure, the voltage dividing module comprises a first resistor, a second resistor, a third resistor, a fourth resistor, and a voltage reference source.

[0014] The first resistor is electrically connected to a first end of the first relay, a first end of the second resistor is electrically connected to a second end of the first resistor, and a second end of the second resistor is electrically connected to the voltage reference source.

[0015] The third resistor is electrically connected to a second end of the first relay, a first end of the fourth resistor is electrically connected to a second end of the third resistor, and a second end of the fourth resistor is electrically connected to the voltage reference source.

[0016] A connection point of the first resistor and the second resistor is a first output end of the voltage dividing module, to output the first voltage division.

[0017] A connection point of the third resistor and the fourth resistor is a second output end of the voltage dividing module, to output the second voltage division.

[0018] The first output end is electrically connected to the isolation module, to transmit the first voltage division.

[0019] The second output end is electrically connected to the isolation module, to transmit the second voltage division.

[0020] In some embodiments of the present disclosure, the voltage reference source is a low-voltage reference ground.

[0021] In some embodiments of the present disclosure, the isolation module comprises a first voltage follower and a second voltage follower.

[0022] A non-inverting input end of the first voltage follower is electrically connected to the first output end of the voltage dividing module, to receive the first voltage division.

[0023] An inverting input end of the first voltage follower is electrically connected to an output end of the first voltage follower.

[0024] The output end of the first voltage follower is electrically connected to a first input pin of the first ADC module.

[0025] A non-inverting input end of the second voltage follower is electrically connected to the second output end of the voltage dividing module, to receive the second voltage division.

[0026] An inverting input end of the second voltage follower is electrically connected to an output end of the second voltage follower.

[0027] An output terminal of the second voltage follower is electrically connected with a second input pin of the first ADC module.

[0028] In some embodiments of the present disclosure, the vehicle power battery system further comprises a second relay;

[0029] The voltage dividing module is electrically connected across the second relay to divide a high voltage across the second relay to obtain a third voltage and a fourth voltage;

[0030] The isolation module is electrically connected to the voltage dividing module to receive the third voltage and the fourth voltage;

[0031] The isolation module is electrically connected to the first ADC module to transmit the third voltage and the fourth voltage to the MCU, so that the MCU samples the voltage across the second relay.

[0032] In some embodiments of the present disclosure, the voltage dividing module further comprises a fifth resistor, a sixth resistor, a seventh resistor, and an eighth resistor.

[0033] The fifth resistor is electrically connected to a first terminal of the second relay, a first terminal of the sixth resistor is electrically connected to a second terminal of the fifth resistor, and a second terminal of the sixth resistor is electrically connected to the voltage reference source.

[0034] The seventh resistor is electrically connected to a second terminal of the second relay, a first terminal of the eighth resistor is electrically connected to a second terminal of the seventh resistor, and a second terminal of the eighth resistor is electrically connected to the voltage reference source.

[0035] A connection point of the fifth resistor and the sixth resistor is a third output terminal of the voltage dividing module to output the third voltage.

[0036] A connection point of the seventh resistor and the eighth resistor is a fourth output terminal of the voltage dividing module to output the fourth voltage.

[0037] The third output terminal is electrically connected to the isolation module to transmit the third voltage.

[0038] The fourth output terminal is electrically connected to the isolation module to transmit the fourth voltage.

[0039] In some embodiments of the present disclosure, the isolation module further comprises a third voltage follower and a fourth voltage follower.

[0040] A positive-phase input terminal of the third voltage follower is electrically connected to the third output terminal of the voltage dividing module to receive the third voltage.

[0041] The inverting input end of the third voltage follower is electrically connected with the output end of the third voltage follower;

[0042] The output end of the third voltage follower is electrically connected with the third input pin of the first ADC module.

[0043] The non-inverting input end of the fourth voltage follower is electrically connected with the fourth output end of the voltage dividing module to receive the fourth voltage division.

[0044] The inverting input end of the fourth voltage follower is electrically connected with the output end of the fourth voltage follower.

[0045] The output end of the fourth voltage follower is electrically connected with the fourth input pin of the first ADC module.

[0046] In some embodiments of the present disclosure, the vehicle power battery system further comprises a third relay;

[0047] The high-voltage sampling circuit further comprises a comparison module.

[0048] The voltage dividing module is electrically connected across the third relay to divide the high voltage across the third relay to obtain a fifth voltage division and a sixth voltage division.

[0049] The comparison module is electrically connected with the voltage dividing module to receive the fifth voltage division and the sixth voltage division.

[0050] The comparison module is configured to compare the fifth voltage division and the sixth voltage division to obtain a first difference signal.

[0051] The MCU further comprises a second ADC module.

[0052] The comparison module is electrically connected with the second ADC module to transmit the first difference signal to the MCU.

[0053] In some embodiments of the present disclosure, the voltage dividing module further comprises a ninth resistor, a tenth resistor, an eleventh resistor, and a twelfth resistor.

[0054] The ninth resistor is electrically connected to the first end of the third relay, the first end of the tenth resistor is electrically connected to the second end of the ninth resistor, and the second end of the tenth resistor is electrically connected to the voltage reference source.

[0055] The eleventh resistor is electrically connected to the second end of the third relay, the first end of the twelfth resistor is electrically connected to the second end of the eleventh resistor, and the second end of the twelfth resistor is electrically connected to the voltage reference source.

[0056] The connection point of the ninth resistor and the tenth resistor is a fifth output end of the voltage division module, to output a fifth voltage division;

[0057] The connection point of the eleventh resistor and the twelfth resistor is a sixth output end of the voltage division module, to output a sixth voltage division;

[0058] The fifth output end is electrically connected with the comparison module, to transmit the fifth voltage division;

[0059] The sixth output end is electrically connected with the comparison module, to transmit the sixth voltage division.

[0060] In some embodiments of the present disclosure, the comparison module comprises a first comparator.

[0061] The first input end of the first comparator is electrically connected with the fifth output end of the voltage division module, to receive the fifth voltage division;

[0062] The second input end of the first comparator is electrically connected with the sixth output end of the voltage division module, to receive the sixth voltage division;

[0063] The output end of the first comparator is electrically connected with the first input pin of the second ADC module.

[0064] According to a second aspect of the embodiments of the present disclosure, a vehicle is provided, comprising the high-voltage sampling circuit according to the first aspect and a vehicle power battery system.

[0065] The vehicle power battery system comprises at least one relay.

[0066] The technical solutions provided by the embodiments of the present disclosure can have the following beneficial effects:

[0067] The high-voltage sampling circuit is arranged to detect the high voltage across the first relay in the vehicle power battery system, the voltage division module is arranged to reduce the high voltage to be detected to a low voltage signal that can be sampled by the MCU, the isolation module is arranged to provide electrical isolation for the MCU, and the MCU with integrated ADC function is arranged to directly sample the low voltage signal transmitted by the isolation module to detect the voltage across the first relay. Compared with the related art, the analog front-end ADC chip, daisy chain and interface communication cooperation scheme are no longer used, the problems of low sampling rate and inability to collect transient voltage jump caused by communication limitation are avoided, and high sampling rate and collection of transient voltage jump are achieved.

[0068] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0069] The accompanying drawings, which are incorporated herein and form a part of the specification, illustrate embodiments consistent with the present disclosure and, together with the description, further serve to explain the principles of the present disclosure. It is to be understood that the drawings are designed solely for purposes of illustration to be used in conjunction with the description insofar as specifically described herein. It is to be further understood that the accompanying drawings illustrate only several embodiments in accordance with the present disclosure and therefore are not to be considered limiting of the scope of the present disclosure as having a particular set of design and / or structural features.

[0070] Figure 1 is a schematic diagram of a high-voltage sampling circuit in accordance with some embodiments of the present disclosure.

[0071] Figure 2 is a schematic diagram of a high-voltage sampling circuit in accordance with some embodiments of the present disclosure. Figure 1 .

[0072] Figure 3 is a schematic diagram of a high-voltage sampling circuit in accordance with some embodiments of the present disclosure. Figure 2 .

[0073] Figure 4 is a schematic diagram of a high-voltage sampling circuit in accordance with some embodiments of the present disclosure. Figure 3 .

[0074] Figure 5 is a schematic diagram of a high-voltage sampling circuit in accordance with some embodiments of the present disclosure. Figure 4 .

[0075] Figure 6 is a schematic diagram of a high-voltage sampling circuit in accordance with some embodiments of the present disclosure. Figure 5 .

[0076] Figure 7 is a schematic diagram of a high-voltage sampling circuit in accordance with some embodiments of the present disclosure.

[0077] Figure 8 is a block diagram of a vehicle in accordance with some embodiments of the present disclosure. DETAILED DESCRIPTION

[0078] Some embodiments of the present disclosure will be described in detail herein with reference to the drawings, in which the same reference characters refer to elements with the same or similar functions. The various changes, modifications and equivalents thereof will become apparent to those skilled in the art after an understanding of the present disclosure. For example, the sequence of operations described herein is merely illustrative, and is not limited to those operations set forth herein, but can be modified as will be apparent to one skilled in the art, other than operations that must be performed in a particular order, as will be apparent to one skilled in the art after an understanding of the present disclosure. In addition, the description of features known in the art can be omitted for the sake of clarity and brevity.

[0079] The implementations described in some embodiments of the present disclosure are not meant to suggest that all implementations consistent with the present disclosure are limited to those implementations described. Rather, the implementations are merely examples of apparatus and methods consistent with aspects of the present disclosure as set forth in the appended claims.

[0080] The specific implementations of the embodiments of the present disclosure will be described below in detail with reference to the accompanying drawings.

[0081] Figure 2 is a structural schematic of a high-voltage sampling circuit according to some embodiments of the present disclosure Figure 1 As shown in Figure 2 , the high-voltage sampling circuit 10 is applied to a vehicle power battery system 20. The vehicle power battery system 20 includes a plurality of relays, such as Figure 2 As shown in

[0082] It should be noted that the relays included in the vehicle power battery system 20 are used to control the on-off of the current, and ensure that the battery safely and effectively provides power for the vehicle. It can include: a main positive relay, usually located at the positive end of the battery pack, which controls the on-off of high-voltage direct current from the battery to the inverter (motor controller). The main responsibility is to close the circuit when the vehicle starts, so that the battery can supply power to the motor, and to open the circuit when the power is turned off or a fault occurs, to protect the system; a main negative relay, located at the negative end of the battery pack, used in conjunction with the main positive relay to form a complete high-voltage loop, the main function of which is to quickly cut off the entire high-voltage circuit in an emergency to prevent the danger of accidental current flow; a pre-charge relay, usually connected in parallel with the main positive relay, connected to the main positive line through a resistor, used to limit the impact of instantaneous large current on sensitive components such as capacitors. When the system is powered on for the first time, the pre-charge relay is closed first to allow a small current to pass through the current-limiting resistor to charge the capacitor in the inverter, and then the main positive relay is closed to avoid the transient overload phenomenon caused by directly connecting high voltage. It can also be a fuse included in the power battery system, such as a main fuse, usually located at the positive end of the battery pack, before the main positive relay; a pre-charge fuse connected in series with the pre-charge relay and located in the pre-charge circuit. It can also be a solid-state relay used to manage the connection between the two battery packs in a double-bank battery pack.

[0083] As understood by those skilled in the art, the first relay 201 can be any of the above-mentioned relay examples, that is, a switching device in the vehicle power battery system 20 that needs to pay attention to the voltage difference between the two ends, or a double-pole double-throw (DPDT) switch, a fuse, etc. The present disclosure does not limit it here.

[0084] It should be noted that the above-mentioned battery pack refers to a power battery, a large rechargeable battery used to provide driving energy for a vehicle, and is a core component of electric vehicles (EVs), hybrid electric vehicles (HEVs), and other electric vehicles. It can be a single battery pack or a double battery pack.

[0085] In some example embodiments of the present disclosure, the high-voltage sampling circuit 10 is used to detect the voltage across the first relay 201.

[0086] As Figure 2As shown, the high-voltage sampling circuit 10 includes a voltage division module 110, an isolation module 120, and a microcontroller unit MCU 130. The MCU 130 is integrated with an analog-to-digital converter ADC function, and the MCU 130 at least includes a first ADC module 131.

[0087] Specifically, the voltage division module 110 is electrically connected to both ends of the first relay 201, for dividing the high voltage at both ends of the first relay 201 to obtain a first voltage division and a second voltage division. The isolation module 120 is electrically connected to the voltage division module 110, for receiving the first voltage division and the second voltage division, and transmitting the first voltage division and the second voltage division to the first ADC module 131 of the MCU 130. The isolation module 120 is also used to provide electrical isolation for the MCU 130, to ensure that the high-voltage signal does not cause damage to the MCU 130.

[0088] It should be noted that the MCU 130 is integrated with one or more ADC modules, which can convert external analog signals into digital signals, and each ADC module can provide multiple ADC input channels, allowing multiple input signals to be sampled and converted simultaneously or at different times.

[0089] The embodiments of the present disclosure directly integrate ADC (analog-to-digital converter) functions in the MCU 130, without the need for additional analog front-end sampling chips to complete the analog-to-digital conversion task. The MCU 130 directly controls the switching state of each channel to achieve signal switching and isolation, rather than using optical coupling switches or digital isolation chips, which simplifies the circuit design and reduces the number of components. The built-in ADC function of the MCU 130 has a high sampling rate, which can reach or even exceed 50 kHz, allowing it to quickly respond to and record transient voltage changes. The MCU 130 has strong real-time processing capabilities, allowing it to quickly process and store data at high sampling rates, ensuring that transient voltage jumps are accurately captured and recorded.

[0090] In some example embodiments of the present disclosure, as Figure 3 shown, a structure diagram of a high-voltage sampling circuit is shown in FIG. 1. Figure 2 Specifically, the voltage division module 110 includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, and a voltage reference source GND.

[0091] The first resistor R1 is electrically connected to the first end of the first relay 201, the first end of the second resistor R2 is electrically connected to the second end of the first resistor R1, and the second end of the second resistor R2 is electrically connected to the voltage reference source GND. The third resistor R3 is electrically connected to the second end of the first relay 201, the first end of the fourth resistor R4 is electrically connected to the second end of the third resistor R3, and the second end of the fourth resistor R4 is electrically connected to the voltage reference source GND. The connection point of the first resistor R1 and the second resistor R2 is the first output end of the voltage division module 110, which is used to output the first voltage division. The first output end is electrically connected to the isolation module 120 to transmit the first voltage division. The connection point of the third resistor R3 and the fourth resistor R4 is the second output end of the voltage division module 110, which is used to output the second voltage division. The second output end is electrically connected to the isolation module 120 to transmit the second voltage division.

[0092] It should be noted that the resistors in the figure are only examples, and in actual use, the above resistors can be in the form of series connection, parallel connection or mixed connection. For example, the first resistor R1 can be in the form of series connection of multiple resistors.

[0093] In some example embodiments of the present disclosure, the first resistor R1 and the third resistor R3 are voltage division on the side with larger resistance in the voltage division network, and the second resistor R2 and the fourth resistor R4 are voltage division on the side with smaller resistance in the voltage division network, that is, the resistance of the first resistor R1 is much larger than that of the second resistor R2, and the resistance of the third resistor R3 is much larger than that of the fourth resistor R4. For example, the resistance of the first resistor R1 and the third resistor R3 is greater than 10M, and the resistance of the second resistor R2 and the fourth resistor R4 is less than 15K.

[0094] And because the resistance of the first resistor R1 and the third resistor R3 is large, the insulation effect can be enhanced, and the high voltage can be further effectively isolated, so that the additional photoelectric coupler is not needed to achieve the insulation requirement, saving circuit components and reducing the cost of the high-voltage sampling circuit.

[0095] It should be noted that the voltage reference source GND can be a low-voltage reference ground or a low-voltage power supply, for example, 2.5V, to ensure that the voltage range of the first voltage division and the second voltage division processed by the voltage division module 110 is within the sampling range of the MCU 130. And through the voltage division module 110, low-voltage sampling of the relay is realized, and the circuit is in a stable state and will not produce virtual voltage, avoiding the safety hazard of virtual voltage generated by high-voltage sampling.

[0096] As Figure 3As shown, the isolation module 120 includes a first voltage follower U1 and a second voltage follower U2. The non-inverting input of the first voltage follower U1 is electrically connected to the first output of the voltage division module 110 for receiving the first voltage division. The inverting input of the first voltage follower U1 is electrically connected to the output of the first voltage follower U1. The output of the first voltage follower U1 is electrically connected to the first input pin of the first ADC module 131 of the MCU 130. The non-inverting input of the second voltage follower U2 is electrically connected to the second output of the voltage division module 110 for receiving the second voltage division. The inverting input of the second voltage follower U2 is electrically connected to the output of the second voltage follower U2. The output of the second voltage follower U2 is electrically connected to the second input pin of the first ADC module 131 of the MCU 130.

[0097] It should be noted that the voltage follower, also known as buffer amplifier or unity gain amplifier, is a special configuration of operational amplifier (Op-Amp) circuit. In this configuration, the output voltage is equal to the input voltage, i.e. the gain is 1.

[0098] The embodiments of the present disclosure set the first voltage follower U1 and the second voltage follower U2 to isolate the output of the voltage division module 110 from the input of the MCU 130, avoiding the influence of the front-stage circuit on the rear-stage circuit, and preventing the influence of the rear-stage circuit on the front-stage circuit, which helps to protect the sensitive MCU 130 from external circuit noise, transient voltage or other potential damage, and improves the stability and reliability of the high-voltage sampling circuit. And due to the low output impedance characteristic of the voltage follower, impedance matching between the front-stage and the rear-stage can be effectively realized, thereby reducing signal reflection and loss and ensuring efficient signal transmission from one part to another. Since the voltage division module 110 has a high input impedance to reduce interference to the measured signal, the voltage division module 110 cannot directly drive the subsequent circuit or the ADC (analog-to-digital converter) input of the MCU 130, because these parts may require lower source impedance to ensure accurate sampling. The voltage follower can act as an intermediate buffer to provide low output impedance signal replication, thereby ensuring efficient transmission of signals between the voltage division module 110 and the MCU 130, avoiding signal loss or distortion caused by impedance mismatch. At the same time, the voltage follower can increase the driving capability of the signal to ensure that the voltage division signal can be transmitted to the MCU 130 without loss for processing.

[0099] It can be understood that a plurality of relays can be included in the vehicle power battery system 20, including not only the first relay 201 but also other relays, which have the same connection relationship with the voltage dividing module 110, the isolation module 120 and the MCU 130 as the first relay 201. In order to better illustrate the high-voltage sampling circuit 10 provided by the present disclosure, it is exemplarily illustrated that the vehicle power battery system 20 further includes a second relay 202. The voltage dividing module 110 is electrically connected to both ends of the second relay 202 to divide the high voltage at both ends of the second relay 202 to obtain a third voltage division and a fourth voltage division; the isolation module 120 is electrically connected to the voltage dividing module 110 to receive the third voltage division and the fourth voltage division; the isolation module 120 is electrically connected to the first ADC module 131 to transmit the third voltage division and the fourth voltage division to the MCU 130, so that the MCU 130 samples the voltage at both ends of the second relay 202.

[0100] The structure of a high-voltage sampling circuit in this exemplary embodiment is shown Figure 3 As shown in Figure 4 On the basis of Figure 3 The voltage dividing module 110 further includes a fifth resistor R5, a sixth resistor R6, a seventh resistor R7 and an eighth resistor R8. The fifth resistor R5 is electrically connected to the first end of the second relay 202, the first end of the sixth resistor R6 is electrically connected to the second end of the fifth resistor R5, and the second end of the sixth resistor R6 is electrically connected to the voltage reference source GND. The seventh resistor R7 is electrically connected to the second end of the second relay 202, the first end of the eighth resistor R8 is electrically connected to the second end of the seventh resistor R7, and the second end of the eighth resistor R8 is electrically connected to the voltage reference source GND.

[0101] It should be noted that the connection point of the fifth resistor R5 and the sixth resistor R6 is the third output end of the voltage dividing module 110, to output the third voltage division. The connection point of the seventh resistor R7 and the eighth resistor R8 is the fourth output end of the voltage dividing module 110, to output the fourth voltage division; the third output end is electrically connected to the isolation module 120 to transmit the third voltage division. The fourth output end is electrically connected to the isolation module 120 to transmit the fourth voltage division.

[0102] As shown in Figure 4 On the basis of Figure 3On the basis of the isolation module 120, further comprising: a third voltage follower U3, a fourth voltage follower U4. The positive input end of the third voltage follower U3 is electrically connected with the third output end of the voltage division module 110, to receive the third voltage division. The negative input end of the third voltage follower U3 is electrically connected with the output end of the third voltage follower U3. The output end of the third voltage follower U3 is electrically connected with the third input pin of the first ADC module 131. The positive input end of the fourth voltage follower U4 is electrically connected with the fourth output end of the voltage division module 110, to receive the fourth voltage division. The negative input end of the fourth voltage follower U4 is electrically connected with the output end of the fourth voltage follower U4. The output end of the fourth voltage follower U4 is electrically connected with the fourth input pin of the first ADC module 131.

[0103] The disclosure can simultaneously read the sampled voltage division signals of multiple places by setting the voltage division signals of multiple relays to access the same ADC module in the MCU 130, ensuring that the interval time of reading each sampling signal is relatively short, and ensuring that even if short-term fluctuations occur, the voltage can be collected.

[0104] In some exemplary embodiments of the disclosure, through the cooperation of the voltage division module 110, the isolation module 120 and the MCU 130, the voltage at both ends of one or more relays in the vehicle power battery system 20 can be monitored in real time. When the MCU 130 calculates that the voltage difference at both ends of a certain relay does not meet the expectation through sampling, a control signal can be generated to adjust the closing or opening of the relay. For example, a digital signal can be output by the GPIO pin (not shown in the figure) of the MCU 130 and connected to the control end of the relay to control the relay.

[0105] The disclosure sets the high-voltage sampling circuit 10 to detect the high voltage at both ends of the first relay 201 in the vehicle power battery system 20. By setting the voltage division module 110 to reduce the high voltage at both ends to be detected to a low voltage signal that can be sampled by the MCU 130, and setting the isolation module 120 to provide electrical isolation for the MCU 130, the low voltage signal transmitted by the isolation module 120 is directly sampled by the MCU 130 with integrated ADC function to detect the voltage at both ends of the first relay 201. Compared with the related art, the analog front-end ADC chip, daisy chain and interface communication cooperation scheme are no longer used, avoiding the problems of low sampling rate and inability to collect instantaneous voltage jump caused by communication restrictions.

[0106] In some exemplary embodiments of this disclosure, it is also necessary to monitor the voltage difference at the moment one or more relays included in the vehicle power battery system 20 are disconnected when an anomaly occurs, so that the MCU 130 can generate a control signal. It is understood that the one or more relays may be all or some of the relays included in the vehicle power battery system 20.

[0107] For better illustration, an exemplary embodiment is now provided, in which the vehicle power battery system 20 further includes a third relay 203. It will be understood that the third relay 203 may be a relay other than the first relay 201 and the second relay 202, or any one of the first relay 201 and the second relay 202.

[0108] like Figure 5 The diagram shows a high-voltage sampling circuit, exemplified by a vehicle power battery system 20 including a first relay 201, a second relay 202, and a third relay 203. Figure 4 .exist Figure 2 Based on this, the high-voltage sampling circuit 10 further includes: a comparison module 140, and a voltage divider module 110 electrically connected to both ends of the third relay 203 to divide the high voltage across the third relay 203 to obtain a fifth voltage divider and a sixth voltage divider. The comparison module 140 is electrically connected to the voltage divider module 110 to receive the fifth voltage divider and the sixth voltage divider. The comparison module 140 is configured to compare the fifth voltage divider and the sixth voltage divider and calculate the difference to obtain a first difference signal. The MCU 130 also includes a second ADC module 132, and the comparison module 140 is electrically connected to the second ADC module 132 to transmit the first difference signal to the MCU 130.

[0109] like Figure 6 The diagram shows a schematic of a high-voltage sampling circuit. Figure 5 ,for Figure 6 The diagram shows a detailed structure of the high-voltage sampling circuit.

[0110] like Figure 4 As shown, in Figure 7 Based on this, the voltage divider module 110 also includes: a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, and a twelfth resistor R12. The ninth resistor R9 is electrically connected to the first terminal of the third relay 203. The first terminal of the tenth resistor R10 is electrically connected to the second terminal of the ninth resistor R9, and the second terminal of the tenth resistor R10 is electrically connected to the voltage reference source GND. The eleventh resistor R11 is electrically connected to the second terminal of the third relay 203. The first terminal of the twelfth resistor R12 is electrically connected to the second terminal of the eleventh resistor R11, and the second terminal of the twelfth resistor R12 is electrically connected to the voltage reference source GND.

[0111] It should be noted that the connection point of the ninth resistor R9 and the tenth resistor R10 is the fifth output end of the voltage division module 110, to output a fifth voltage division. The connection point of the eleventh resistor R11 and the twelfth resistor R12 is the sixth output end of the voltage division module 110, to output a sixth voltage division. The fifth output end is electrically connected with the comparison module 140 to transmit the fifth voltage division, and the sixth output end is electrically connected with the comparison module 140 to transmit the sixth voltage division.

[0112] Specifically, the comparison module 140 comprises: a first comparator OP1, a first input end of the first comparator OP1 is electrically connected with the fifth output end of the voltage division module 110 to receive the fifth voltage division; a second input end of the first comparator OP1 is electrically connected with the sixth output end of the voltage division module 110 to receive the sixth voltage division; and an output end of the first comparator OP1 is electrically connected with a first input pin of the second ADC module 132.

[0113] It should be noted that the first input end of the first comparator OP1 can be a positive phase input end of the comparator, or a negative phase input end of the comparator. When the first input end of the first comparator OP1 is the positive phase input end of the comparator, the second input end of the first comparator OP1 is the negative phase input end of the comparator. When the first input end of the first comparator OP1 is the negative phase input end of the comparator, the second input end of the first comparator OP1 is the positive phase input end of the comparator.

[0114] It can be understood that, in addition to the third relay 203, the vehicle power battery system 20 can also comprise other relays, which have the same connection relationship with the voltage division module 110, the comparison module 140 and the MCU 130 as the third relay 203, and the voltage difference signals at both ends of each relay are input into the same ADC module of the MCU 130, to ensure that the signals are collected at the same time, so that the short-time fluctuation can be collected, and the disclosure embodiment will not be described here.

[0115] It should be noted that the collection of the third relay 203 and other relays focuses on the sampling of the voltage difference at the moment of disconnection after the occurrence of an abnormality, so the sampling rate needs to be improved. By setting the comparison module 140, the difference value signal is obtained by differencing the voltages at both ends of the relay in real time, to be read by the MCU 130 quickly, without the need for the MCU 130 to compare the voltages at both ends, which can effectively reduce the load of the MCU 130, and can collect and record the instantaneous voltage jump, to improve the real-time performance and accuracy of the relay monitoring of the MCU 130.

[0116] The disclosure can safely and accurately collect the voltage of the relays in the vehicle power battery system 20 in real time by setting the voltage division module 110, the isolation module 120 and the comparison module 140, and transmit the sampling results to the MCU 130 for processing without loss, to ensure the safety and reliability of the vehicle power battery system.

[0117] To better illustrate the working principle of the high-voltage sampling circuit 10 provided by the embodiments of the present disclosure, the working principle of the high-voltage sampling circuit 10 applied to a double-bank battery pack is described in combination with Figure 7 .

[0118] Figure 1 The high-voltage sampling circuit applied to a double-bank battery pack is shown. The double-bank battery pack includes two battery groups, which are connected through a DPDT control circuit. Specifically, the positive polarity end DC+ of the double-bank battery pack is connected with a fast-charging positive relay Con1, the fast-charging positive relay Con1 is connected with the main positive relay Main+ in series, and then connected with the first cell B1, the shunt resistor shunt1, and the fuse PYRO1, and then connected with the DPDT. The negative polarity end DC- is connected with a fast-charging negative relay Con2, the fast-charging negative relay Con2 is connected with the main negative relay Main- in series, and then connected with the second cell B2, the shunt resistor shunt2, and the fuse PYRO2, and then connected with the DPDT. The voltages at the points (the first sampling point to the eleventh sampling point) of the double-bank battery pack which need to be sampled are respectively marked as V0 to V10 in the figure, to monitor the voltages across the fast-charging positive relay Con1, the main positive relay Main+, the fuse PYRO1, the DPDT, the fuse PYRO2, the main negative relay Main-, and the fast-charging negative relay Con2, and the voltage difference of each switch (relay, double-pole double-throw switch, and fuse).

[0119] As shown in the figure, the voltage division module 110 includes a plurality of resistors R701 to R722 and a high-precision voltage reference source GND1. The isolation module 120 includes a plurality of voltage followers U701 to U709. The comparison module 140 includes a plurality of comparators OP701 to OP706. The MCU 130 includes two ADC modules, ADC701 and ADC702.

[0120] The first end (the second sampling point) of the main positive relay Main+ is connected with the resistor R703, the resistor R704, and the high-precision voltage reference source GND1 in series, and the connection point of the resistor R703 and the resistor R704 is connected with the positive-phase input end of the voltage follower U701. The negative-phase input end of the voltage follower U701 is connected with the output end, and the output end of the voltage follower U701 is connected with the first input pin of the ADC701.

[0121] The second end (the third sampling point) of the main positive relay Main+ is connected with the resistor R705, the resistor R706, and the high-precision voltage reference source GND1 in series, and the connection point of the resistor R705 and the resistor R706 is connected with the positive-phase input end of the voltage follower U702. The negative-phase input end of the voltage follower U702 is connected with the output end, and the output end of the voltage follower U702 is connected with the second input pin of the ADC701.

[0122] The first end (the fourth sampling point) of the fuse PYRO1 is connected in series with the resistor R707, the resistor R708, and the high-precision voltage reference source GND1, and the connection point of the resistor R707 and the resistor R708 is electrically connected to the positive input terminal of the voltage follower U703. The negative input terminal and the output terminal of the voltage follower U703 are electrically connected, and the output terminal of the voltage follower U703 is electrically connected to the third input pin of the ADC 701.

[0123] The second end (the fifth sampling point) of the fuse PYRO1 is connected in series with the resistor R709, the resistor R710, and the high-precision voltage reference source GND1, and the connection point of the resistor R709 and the resistor R710 is electrically connected to the positive input terminal of the voltage follower U704. The negative input terminal and the output terminal of the voltage follower U704 are electrically connected, and the output terminal of the voltage follower U704 is electrically connected to the fourth input pin of the ADC 701.

[0124] The first end (the sixth sampling point) of the DPDT is connected in series with the resistor R711, the resistor R712, and the high-precision voltage reference source GND1, and the connection point of the resistor R711 and the resistor R712 is electrically connected to the positive input terminal of the voltage follower U705. The negative input terminal and the output terminal of the voltage follower U705 are electrically connected, and the output terminal of the voltage follower U705 is electrically connected to the fifth input pin of the ADC 701.

[0125] The second end (the seventh sampling point) of the DPDT is connected in series with the resistor R713, the resistor R714, and the high-precision voltage reference source GND1, and the connection point of the resistor R713 and the resistor R714 is electrically connected to the positive input terminal of the voltage follower U706. The negative input terminal and the output terminal of the voltage follower U706 are electrically connected, and the output terminal of the voltage follower U706 is electrically connected to the sixth input pin of the ADC 701.

[0126] The first end (the seventh sampling point) of the fuse PYRO2 is connected in series with the resistor R713, the resistor R714, and the high-precision voltage reference source GND1, and the connection point of the resistor R713 and the resistor R714 is electrically connected to the positive input terminal of the voltage follower U706. The negative input terminal and the output terminal of the voltage follower U706 are electrically connected, and the output terminal of the voltage follower U706 is electrically connected to the seventh input pin of the ADC 701.

[0127] The second end (the eighth sampling point) of the fuse PYRO2 is connected in series with the resistor R715, the resistor R716, and the high-precision voltage reference source GND1, and the connection point of the resistor R715 and the resistor R716 is electrically connected to the positive input terminal of the voltage follower U707. The negative input terminal and the output terminal of the voltage follower U707 are electrically connected, and the output terminal of the voltage follower U707 is electrically connected to the seventh input pin of the ADC 701.

[0128] The first end (the ninth sampling point) of the main negative relay Main- is connected in series with the resistor R717, the resistor R718, and the high-precision voltage reference source GND1, and the connection point of the resistor R717 and the resistor R718 is electrically connected to the positive input end of the voltage follower U708. The negative input end and the output end of the voltage follower U708 are electrically connected, and the output end of the voltage follower U708 is electrically connected to the eighth input pin of the ADC 701.

[0129] The second end (the tenth sampling point) of the main negative relay Main- is connected in series with the resistor R719, the resistor R720, and the high-precision voltage reference source GND1, and the connection point of the resistor R719 and the resistor R720 is electrically connected to the positive input end of the voltage follower U709. The negative input end and the output end of the voltage follower U709 are electrically connected, and the output end of the voltage follower U709 is electrically connected to the ninth input pin of the ADC 701.

[0130] Since the fast charging positive relay Con1 and the fast charging negative relay Con2 are kept open in the non-charging state to prevent accidental electric shock or other electrical faults, it is necessary to monitor the real-time disconnection of them. The shutdown of the fuse PYRO1 and the fuse PYRO2 generally occurs when an overcurrent fault occurs, and real-time monitoring of the disconnection moment is also required.

[0131] Specifically, the first end (the first sampling point) of the fast charging positive relay Con1 is connected in series with the resistor R701, the resistor R702, and the high-precision voltage reference source GND1, and the connection point of the resistor R701 and the resistor R702 is electrically connected to the positive input end of the comparator OP701. The second end (the second sampling point) of the fast charging positive relay Con1 is connected in series with the resistor R703, the resistor R704, and the high-precision voltage reference source GND1, and the connection point of the resistor R703 and the resistor R704 is electrically connected to the negative input end of the comparator OP701. The output end of the comparator OP701 is electrically connected to the first input pin of the ADC 702.

[0132] The first end (the second sampling point) of the main positive relay Main+ is connected in series with the resistor R703, the resistor R704, and the high-precision voltage reference source GND1, and the connection point of the resistor R703 and the resistor R704 is electrically connected to the positive input end of the comparator OP702. The second end (the third sampling point) of the main positive relay Main+ is connected in series with the resistor R705, the resistor R706, and the high-precision voltage reference source GND1, and the connection point of the resistor R705 and the resistor R706 is electrically connected to the negative input end of the comparator OP702. The output end of the comparator OP702 is electrically connected to the second input pin of the ADC 702.

[0133] The first end (the fourth sampling point) of the fuse PYRO1 is connected in series with the resistor R707, the resistor R708 and the high-precision voltage reference source GND1, and the connection point of the resistor R707 and the resistor R708 is electrically connected to the positive input terminal of the comparator OP703. The second end (the fifth sampling point) of the fuse PYRO1 is connected in series with the resistor R709, the resistor R710 and the high-precision voltage reference source GND1, and the connection point of the resistor R709 and the resistor R710 is electrically connected to the negative input terminal of the comparator OP703. The output terminal of the comparator OP703 is electrically connected to the third input pin of the ADC702.

[0134] The first end (the seventh sampling point) of the fuse PYRO2 is connected in series with the resistor R713, the resistor R714 and the high-precision voltage reference source GND1, and the connection point of the resistor R713 and the resistor R714 is electrically connected to the positive input terminal of the comparator OP704. The second end (the eighth sampling point) of the fuse PYRO2 is connected in series with the resistor R715, the resistor R716 and the high-precision voltage reference source GND1, and the connection point of the resistor R715 and the resistor R716 is electrically connected to the negative input terminal of the comparator OP704. The output terminal of the comparator OP704 is electrically connected to the fourth input pin of the ADC702.

[0135] The first end (the ninth sampling point) of the main negative relay Main- is connected in series with the resistor R717, the resistor R718 and the high-precision voltage reference source GND1, and the connection point of the resistor R717 and the resistor R718 is electrically connected to the positive input terminal of the comparator OP705. The second end (the tenth sampling point) of the main negative relay Main- is connected in series with the resistor R719, the resistor R720 and the high-precision voltage reference source GND1, and the connection point of the resistor R719 and the resistor R720 is electrically connected to the negative input terminal of the comparator OP705. The output terminal of the comparator OP705 is electrically connected to the fifth input pin of the ADC702.

[0136] The first end (the tenth sampling point) of the fast charging negative relay Con2 is connected in series with the resistor R719, the resistor R720 and the high-precision voltage reference source GND1, and the connection point of the resistor R719 and the resistor R720 is electrically connected to the positive input terminal of the comparator OP706. The second end (the eleventh sampling point) of the fast charging negative relay Con2 is connected in series with the resistor R721, the resistor R722 and the high-precision voltage reference source GND1, and the connection point of the resistor R721 and the resistor R722 is electrically connected to the negative input terminal of the comparator OP706. The output terminal of the comparator OP706 is electrically connected to the sixth input pin of the ADC702.

[0137] It should be noted that, in order to better show in the figure, the ADC702 is shown in two parts in the figure, but in fact the ADC702 only has one module.

[0138] The resistance values of the resistors R701, R703, R705, R707, R709, R711, R713, R715, R717, R719, R721 are all greater than 10M, and each resistor is formed by a plurality of resistors connected in series. For the convenience of description, only one resistor is marked. The resistance values of the resistors R702, R704, R706, R708, R710, R712, R714, R716, R718, R720, R722 are 14.7k.

[0139] As can be seen, compared with Figure 7 the related art shown in FIG. 1, Figure 8 the high-voltage sampling circuit shown in FIG. 2 can save one independent analog front-end sampling chip and its power supply circuit, save a plurality of optocoupler switches (S11 to S14) and digital isolation / bulb chain chips, and can also improve the signal transmission speed and realize high-speed sampling. In addition, there is no virtual voltage before the relay is closed, which avoids the risk of electric leakage caused by virtual voltage and can ensure the safety of the vehicle. In addition, the sampling rate is high, which can be greater than 50Khz, and the instantaneous voltage jump can be collected and recorded.

[0140] Based on the same concept, the present disclosure also provides a vehicle, as described in the following embodiments. Since the principle of solving the problem of the vehicle embodiment is similar to that of the above-mentioned high-voltage sampling circuit embodiment, the implementation of the above-mentioned high-voltage sampling circuit embodiment can be referred to, and the repeated parts will not be described herein.

[0141] In some embodiments of the present disclosure, the vehicle includes any one of the high-voltage sampling circuits provided in the above-mentioned embodiments and a vehicle power battery system. It can be understood that the vehicle power battery system is any one of the vehicle power battery systems described in the above-mentioned embodiments, which includes at least one relay.

[0142] Figure 8 is a block diagram of a vehicle 800 according to an example embodiment. For example, the vehicle 800 can be a hybrid vehicle, or a non-hybrid vehicle, an electric vehicle, a fuel cell vehicle, or another type of vehicle. The vehicle 800 can be an autonomous vehicle, a semi-autonomous vehicle, or a non-autonomous vehicle.

[0143] Referring to ​ , the vehicle 800 can include various subsystems, such as an infotainment system 810, a perception system 820, a decision control system 830, a drive system 840, a computing platform 850, and a battery management system 860. The vehicle 800 can include more or fewer subsystems, and each subsystem can include multiple components. In addition, each subsystem and each component of the vehicle 800 can be interconnected by wired or wireless means.

[0144] In some embodiments, infotainment system 810 can include a communication system, an entertainment system, a navigation system, and the like.

[0145] Sensing system 820 can include several sensors for sensing information of the environment surrounding vehicle 800. For example, sensing system 820 can include a global positioning system (which can be a GPS system, a Beidou system, or other positioning system), an inertial measurement unit (IMU), a lidar, a millimeter wave radar, an ultrasonic radar, and a camera.

[0146] Decision control system 830 can include a computing system, a vehicle controller, a steering system, a throttle, and a braking system.

[0147] Drive system 840 can include components that provide motive power for vehicle 800. In one embodiment, drive system 840 can include an engine, an energy source, a transmission system, and wheels. The engine can be one or a combination of an internal combustion engine, an electric motor, an air compression engine, or the like. The engine can convert energy provided by the energy source into mechanical energy.

[0148] Some or all functions of vehicle 800 are controlled by computing platform 850. Computing platform 850 can include at least one processor 851 and memory 852, and processor 851 can execute instructions 853 stored in memory 852.

[0149] Processor 851 can be any conventional processor, such as commercially available CPUs. Processor can also include a Graphics Processing Unit (GPU), a Field Programmable Gate Array (FPGA), a System on Chip (SOC), an Application Specific Integrated Circuit (ASIC), or a combination thereof.

[0150] Memory 852 can be implemented by any type of volatile or nonvolatile memory or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read only memory (EEPROM), erasable programmable read only memory (EPROM), programmable read only memory (PROM), read only memory (ROM), magnetic memory, flash memory, a magnetic disk or a optical disk.

[0151] In addition to instructions 853, memory 852 can store data such as road maps, route information, vehicle location, direction, speed, etc. Data stored by memory 852 can be used by computing platform 850.

[0152] In the embodiments of the present disclosure, the high-voltage sampling circuit provided by the embodiments of the present disclosure and the vehicle power battery system are arranged in the battery management system 860, so as to sample the voltage of the relays contained in the vehicle power battery system, and monitor the vehicle power battery system.

[0153] It should be understood that the features of various embodiments of the present disclosure described herein can be combined with each other unless specifically indicated otherwise. As used herein, the term "and / or" includes any one of the related listed terms and any combination of any two or more; similarly, "at least one of" includes any one of the related listed terms and any combination of any two or more.

[0154] It should be understood that, unless specifically stated and limited otherwise, the terms "engaged", "attached", "mounted", "connected", "linked", "fixed" and the like used in the embodiments of the present disclosure should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection or communication with each other; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in this article can be understood according to the specific circumstances.

[0155] In addition, the word "over" used in the context of a component, element, or layer "over" another component, element, or layer means that the component, element, or layer is positioned (e.g., disposed, formed, deposited, etc.) "indirectly" over the other component, element, or layer such that one or more additional components, elements, or layers are arranged between the surface and the component, element, or layer. However, the word "over" used in the context of a component, element, or layer "over" another component, element, or layer can optionally also have the specific meaning that the component, element, or layer is positioned (e.g., disposed, formed, deposited, etc.) "directly" over the other component, element, or layer, e.g., in direct contact with the surface.

[0156] Although terms such as "first", "second", and "third" can be used herein to describe various elements, components, regions, layers or sections, these elements, components, regions, layers or sections should not be limited to the terms. Instead, these terms are used only to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, the first element, component, region, layer or section mentioned in the examples described herein can also be referred to as the second element, component, region, layer or section without departing from the teachings of the examples. In addition, the terms "first", "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description herein, the meaning of "a plurality" is at least two, for example, two, three, etc., unless otherwise explicitly specified.

[0157] It should be understood that spatially relative terms, such as "above", "upper", "below", and "lower", among others, are used herein for describing the relationship between one element and another element as shown in the figures. In addition to the orientation depicted in the figures, such spatially relative terms are intended to encompass different orientations of the device in use or operation. For example, if the device in the figures is turned over, an element described as above or upper relative to another element would then be below or lower relative to the other element. Accordingly, the term "above" encompasses both the above and below orientations. The device can have other ways of orientation (e.g., rotated 90 degrees or at other orientations), and the spatially relative terms used herein should be interpreted accordingly.

[0158] In addition, the word "exemplary" is used herein to mean serving as an example, instance, or illustration. Any aspect or design described herein as "exemplary" is not necessarily to be construed as advantageous over other aspects or designs. Rather, the exemplary aspects are used to illustrate concepts. As used in this document, the term "or" is intended to mean an inclusive "or" rather than an exclusive "or". That is, unless specified otherwise, or clear from context, "X employs A or B" is intended to mean any of the natural inclusive permutations. That is, if X employs A; X employs B; or X employs both A and B, then "X employs A or B" is satisfied under any of the foregoing instances. In addition, the articles "a" and "an" as used in this application and the appended claims should generally be construed to mean "one or more" unless specified otherwise or clear from context to be directed to a singular form. Thus, use of the articles in this application and the appended claims is not limiting.

[0159] Likewise, although the present disclosure has been described and illustrated with respect to one or more implementations, equivalent alterations and modifications will become apparent to those skilled in the art that do not depart from the true spirit and scope of the disclosure. The present disclosure includes all such modifications and alterations and is limited only by the scope of the following claims. In particular regard to the various functions performed by the above described components (e.g., elements, resources, etc.), the terms (including a reference to a "means") used to describe such components are intended to correspond, unless otherwise indicated, to any component which performs the specified function of the described component (e.g., a functional equivalent), even though not structurally equivalent to the disclosed structure. In addition, although a particular feature of the disclosure can have been disclosed with respect to only one of several implementations, other implementations can include the particular feature. For example, the disclosure can be implemented with respect to other implementations that incorporate the particular feature, and that implement other elements or aspects of the disclosure, and the disclosure can also be implemented without including the particular feature. Furthermore, although the foregoing has been described in some detail for purposes of clarity, it will be apparent that certain changes and modifications can be made that will affect the appended claims. For example, various implementations of the present disclosure have been described above. However, one skilled in the art will readily appreciate that the specific configurations illustrated are merely exemplary and should not be construed as limiting the scope of the present disclosure. For example, the various features of the different implementations can be combined in any combination. Accordingly, the application is intended to embrace all such alterations, modifications, and variations that fall within the scope of this application. Furthermore, although the foregoing has been described in some detail for purposes of clarity, it will be apparent that certain changes and modifications can be made that will affect the appended claims. Accordingly, the application is intended to embrace all such alterations, modifications, and variations that fall within the scope of this application. Furthermore, the purpose of the Abstract is to enable the patent office and the public generally, and especially the scientists, engineers, and practitioners in the art who are not familiar with patent or legal terms or phraseology, to determine quickly from a cursory inspection the nature of the technical disclosure. The Abstract is submitted with the understanding that it will not be used to interpret or to limit the meaning or support of the claims. In addition, the singular forms "a", "an", and "the" include plural referents unless the context clearly dictates otherwise. "Or" means "and / or" unless context clearly dictates otherwise. Standard reference works setting forth the genera or species to which a particular genus name or species name can belong are well known to those of skill in the art. Standard reference works include, for example, the Handbook of Patent

[0160] Other embodiments of the present disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. The application is intended to cover any variations, uses, or adaptations of the application following, in general, the principles of the application and including such

[0161] It is understood that the present disclosure is not limited to the precise construction and methods described herein and as illustrated in the accompanying drawings, and that various modifications and changes can be made without departing from the scope thereof. The scope of the present disclosure is limited only by the claims that follow.

Claims

1. A high voltage sampling circuit, characterized by, The high-voltage sampling circuit is applied to a vehicle power battery system, and the vehicle power battery system at least comprises a first relay; The high-voltage sampling circuit comprises: A voltage dividing module electrically connected to both ends of the first relay to divide high voltage at both ends of the first relay to obtain a first voltage division and a second voltage division; An isolation module electrically connected to the voltage dividing module to receive the first voltage division and the second voltage division; A microcontroller unit (MCU) integrated with an analog-to-digital converter (ADC) function, and the MCU at least comprises a first ADC module; The isolation module is electrically connected to the first ADC module to transmit the first voltage division and the second voltage division to the MCU to enable the MCU to sample voltage at both ends of the first relay; The isolation module is configured to provide electrical isolation for the MCU.

2. The high-voltage sampling circuit of claim 1, wherein, The voltage dividing module comprises a first resistor, a second resistor, a third resistor, a fourth resistor, and a voltage reference source; The first resistor is electrically connected to a first end of the first relay, a first end of the second resistor is electrically connected to a second end of the first resistor, and a second end of the second resistor is electrically connected to the voltage reference source; The third resistor is electrically connected to a second end of the first relay, a first end of the fourth resistor is electrically connected to a second end of the third resistor, and a second end of the fourth resistor is electrically connected to the voltage reference source; A connection point of the first resistor and the second resistor is a first output end of the voltage dividing module to output the first voltage division; A connection point of the third resistor and the fourth resistor is a second output end of the voltage dividing module to output the second voltage division; The first output end is electrically connected to the isolation module to transmit the first voltage division; The second output end is electrically connected to the isolation module to transmit the second voltage division.

3. The high-voltage sampling circuit of claim 2, wherein, The voltage reference source is a low-voltage reference ground.

4. The high-voltage sampling circuit of claim 2, wherein, The isolation module comprises a first voltage follower and a second voltage follower; A positive input end of the first voltage follower is electrically connected to the first output end of the voltage dividing module to receive the first voltage division; An inverting input end of the first voltage follower is electrically connected to an output end of the first voltage follower; The output end of the first voltage follower is electrically connected to a first input pin of the first ADC module; A positive input end of the second voltage follower is electrically connected to the second output end of the voltage dividing module to receive the second voltage division; An inverting input end of the second voltage follower is electrically connected to an output end of the second voltage follower; The output end of the second voltage follower is electrically connected to a second input pin of the first ADC module.

5. The high-voltage sampling circuit of claim 4, wherein, The vehicle power battery system further comprises a second relay; The voltage dividing module is electrically connected to both ends of the second relay to divide high voltage at both ends of the second relay to obtain a third voltage division and a fourth voltage division; The isolation module is electrically connected to the voltage dividing module to receive the third voltage division and the fourth voltage division; The isolation module is electrically connected with the first ADC module to transmit the third voltage division and the fourth voltage division to the MCU, so that the MCU samples the voltage across the second relay.

6. The high-voltage sampling circuit of claim 5, wherein, The voltage division module further comprises a fifth resistor, a sixth resistor, a seventh resistor and an eighth resistor. The fifth resistor is electrically connected to the first end of the second relay, the first end of the sixth resistor is electrically connected to the second end of the fifth resistor, and the second end of the sixth resistor is electrically connected to the voltage reference source. The seventh resistor is electrically connected to the second end of the second relay, the first end of the eighth resistor is electrically connected to the second end of the seventh resistor, and the second end of the eighth resistor is electrically connected to the voltage reference source. The connection point of the fifth resistor and the sixth resistor is a third output end of the voltage division module, to output the third voltage division. The connection point of the seventh resistor and the eighth resistor is a fourth output end of the voltage division module, to output the fourth voltage division. The third output end is electrically connected with the isolation module to transmit the third voltage division. The fourth output end is electrically connected with the isolation module to transmit the fourth voltage division.

7. The high-voltage sampling circuit of claim 6, wherein, The isolation module further comprises a third voltage follower and a fourth voltage follower. The non-inverting input end of the third voltage follower is electrically connected with the third output end of the voltage division module to receive the third voltage division. The inverting input end of the third voltage follower is electrically connected with the output end of the third voltage follower. The output end of the third voltage follower is electrically connected with the third input pin of the first ADC module. The non-inverting input end of the fourth voltage follower is electrically connected with the fourth output end of the voltage division module to receive the fourth voltage division. The inverting input end of the fourth voltage follower is electrically connected with the output end of the fourth voltage follower. The output end of the fourth voltage follower is electrically connected with the fourth input pin of the first ADC module.

8. The high-voltage sampling circuit of claim 2, wherein, The vehicle power battery system further comprises a third relay. The high-voltage sampling circuit further comprises a comparison module. The voltage division module is electrically connected across the third relay to divide the high voltage across the third relay to obtain a fifth voltage division and a sixth voltage division. The comparison module is electrically connected with the voltage division module to receive the fifth voltage division and the sixth voltage division. The comparison module is configured to compare the fifth voltage division and the sixth voltage division to obtain a first difference signal. The MCU further comprises a second ADC module. The comparison module is electrically connected with the second ADC module to transmit the first difference signal to the MCU.

9. The high-voltage sampling circuit of claim 8, wherein, The voltage division module further comprises a ninth resistor, a tenth resistor, an eleventh resistor and a twelfth resistor. The ninth resistor is electrically connected to the first end of the third relay, the first end of the tenth resistor is electrically connected to the second end of the ninth resistor, and the second end of the tenth resistor is electrically connected to the voltage reference source. The eleventh resistor is electrically connected to a second end of the third relay, a first end of the twelfth resistor is electrically connected to a second end of the eleventh resistor, and a second end of the twelfth resistor is electrically connected to the voltage reference source; A connection point of the ninth resistor and the tenth resistor is a fifth output end of the voltage division module, to output a fifth voltage division; A connection point of the eleventh resistor and the twelfth resistor is a sixth output end of the voltage division module, to output a sixth voltage division; The fifth output end is electrically connected to the comparison module, to transmit the fifth voltage division; The sixth output end is electrically connected to the comparison module, to transmit the sixth voltage division.

10. The high-voltage sampling circuit of claim 9, wherein, The comparison module comprises a first comparator. A first input end of the first comparator is electrically connected to the fifth output end of the voltage division module, to receive the fifth voltage division; A second input end of the first comparator is electrically connected to the sixth output end of the voltage division module, to receive the sixth voltage division; An output end of the first comparator is electrically connected to a first input pin of the second ADC module.

11. A vehicle characterized by comprising: The high-voltage sampling circuit according to any one of claims 1 to 10 and a vehicle power battery system are provided. The vehicle power battery system comprises at least one relay.

Images