Relay state detection system, vehicle high-voltage system and vehicle

Abstract

The utility model provides a kind of relay state detection system, vehicle high pressure system and vehicle, and relay state detection system includes controller, isolated power module, isolation chip and multiple relays. Among them, isolation chip is connected with controller, isolated power module and each relay respectively, isolated power module is used to power supply to isolation chip, controller is used to send detection signal to each relay by isolation chip, and the detection feedback signal corresponding to each relay is obtained by isolation chip, to determine the connection state of each relay. In this way, based on one multiple-way isolation chip and multiple relays are connected respectively, the connection state of multiple relays can be detected, the system is more simple, and the cost is reduced. Moreover, only one isolated power module is set, which realizes separate power supply for the relay state detection circuit, and also realizes voltage isolation for the relay detection circuit, avoiding the influence of other circuits on the detection circuit.

Description

Technical Field

[0001] This utility model relates to the field of relay status detection technology, and in particular to a relay status detection system, a vehicle high-voltage system, and a vehicle. Background Technology

[0002] With the booming development of the automotive industry, vehicle high-voltage systems are becoming increasingly complex, making their safety and reliability ever more critical. High-voltage systems typically include multiple relays, and the connection status of these relays reflects the operating state of the high-voltage system. Therefore, accurately detecting the connection status of relays in a high-voltage system to identify relays with adhesion faults and subsequently resolve high-voltage system malfunctions is a top priority for the automotive industry.

[0003] Existing relay status detection solutions typically employ isolated power supply voltage divider detection. This approach requires providing each relay in a high-voltage system with an independent isolated power supply and isolation chip to detect the connection status of each relay. This type of relay status detection solution is complex and costly due to the presence of multiple isolated power supplies and chips.

[0004] Therefore, existing relay status detection schemes suffer from system complexity and high cost. Utility Model Content

[0005] The purpose of this application is to solve the problems of system complexity and high cost of existing relay status detection schemes.

[0006] This application provides a relay status detection system that can detect the connection status of multiple relays based on an isolated power supply module and an isolated chip. The system has a simple composition and effectively reduces the cost of relay status detection.

[0007] To address the aforementioned technical problems, in a first aspect, embodiments of this application disclose a relay status detection system. This system includes a controller, an isolation power supply module, an isolation chip, and multiple relays. The isolation chip is connected to the controller, the isolation power supply module, and each relay. The isolation power supply module supplies power to the isolation chip. The controller sends detection signals to each relay via the isolation chip and obtains corresponding detection feedback signals from each relay via the isolation chip to determine the connection status of each relay, which is either a closed or open state.

[0008] By adopting the above technical solution, based on a multi-channel isolation chip connected to multiple relays, the controller can send detection signals to each relay based on the isolation chip and receive detection feedback signals transmitted back from the relays to determine the connection status of each relay. This simplifies the system composition, and since only one isolation chip is used for detecting the connection status of multiple relays, costs are reduced. Furthermore, in this implementation, because only one isolation chip is used, only one isolation power supply module is needed, reducing the number of isolation power supply modules and enabling separate power supply to the relay status detection circuit. This achieves power isolation for the relay detection circuit and avoids the influence of other circuits on the detection circuit.

[0009] According to another specific embodiment of this application, the relay status detection system disclosed in this application includes a first signal input terminal and a first signal output terminal for each relay, an isolation chip including a second signal input terminal, a second signal output terminal, and multiple third signal input terminals and multiple third signal output terminals, and a controller including a fourth signal output terminal and multiple fourth signal input terminals. The second signal input terminal of the isolation chip is connected to the fourth signal output terminal of the controller, the second signal output terminal of the isolation chip is connected to the first signal input terminal of each relay, each third signal input terminal of the isolation chip is connected to the first signal output terminal of a different relay, and each third signal output terminal of the isolation chip is connected to a different fourth signal input terminal of the controller.

[0010] According to another specific embodiment of this application, the relay state detection system disclosed in this application further includes multiple first capacitors and multiple second capacitors. Each first capacitor corresponds to a different relay, and each second capacitor corresponds to a different relay. An isolation chip is connected to the first signal input terminal of the corresponding relay through a second signal output terminal and the first capacitors, respectively. Each relay is connected to the third signal input terminal of the isolation chip through a first signal output terminal and the second capacitors. Specifically, the input terminal of each first capacitor is connected to the second signal output terminal of the isolation chip, the output terminal of each first capacitor is connected to the first signal input terminal of the corresponding relay, the input terminal of each second capacitor is connected to the first signal output terminal of the corresponding relay, and the output terminal of each second capacitor is connected to the corresponding second signal input terminal of the isolation chip.

[0011] By employing the above technical solution, a first capacitor and a second capacitor are respectively installed at both ends of the relay to achieve signal isolation from the relay, preventing interference from other circuits connected to the relay and thus achieving the goal of accurately detecting the connection / disconnection status of each relay. Furthermore, because the voltage across the relay is very high, the capacitors provide isolation to prevent damage to the isolation chip caused by the high voltage of the relay.

[0012] According to another specific embodiment of this application, the relay state detection system disclosed in this application further includes a first resistor and a reverse diode. The isolation chip is connected to the input terminal of the corresponding first capacitor through the first resistor and the reverse diode. The input terminal of the first resistor is connected to the second signal output terminal of the isolation chip, the output terminal of the first resistor is connected to the input terminal of the reverse diode, and the output terminal of the reverse diode is connected to the input terminal of each first capacitor.

[0013] By adopting the above technical solution, the current of the relay detection circuit is limited by setting the first resistor, thereby protecting the circuit. The reverse diode is set to limit the flow direction of the detection signal to avoid the detection signal from flowing back and causing inaccurate detection.

[0014] According to another specific embodiment of this application, the relay state detection system disclosed in this application further includes a plurality of second resistors, each second resistor corresponding to a different second capacitor, one end of the second resistor being connected to the output terminal of the corresponding second capacitor, and the other end of each second resistor being grounded.

[0015] By adopting the above technical solution, a second resistor is set to divide the voltage or limit the current of the corresponding circuit, thereby protecting the relay on the corresponding circuit.

[0016] According to another specific embodiment of this application, the relay status detection system disclosed in this application has an isolation power supply module that is a DC-DC power supply module. The DC-DC power supply module includes an input positive pin, an input negative pin, an output positive pin, and an output negative pin. The isolation chip includes a first voltage input pin and a second voltage input pin. The input positive pin of the DC-DC power supply module is connected to the first voltage input pin of the isolation chip, the output positive pin of the DC-DC power supply module is connected to the second voltage input pin of the isolation chip, the input negative pin of the DC-DC power supply module is grounded, and the output negative pin of the DC-DC power supply module is grounded.

[0017] By adopting the above technical solution, an isolated power supply module is set up to achieve separate power supply for the relay status detection circuit and to achieve voltage isolation of the relay detection circuit, thus avoiding the influence of other circuits on the detection circuit.

[0018] According to another specific embodiment of this application, the relay status detection system disclosed in this application uses a pulse width modulation signal for detection, and the fourth signal input terminal is the signal input interface of the analog-to-digital converter of the controller.

[0019] According to another specific embodiment of this application, the relay status detection system disclosed in this application has a first resistor with a resistance value ranging from 900 ohms to 1100 ohms, and a first capacitor and a second capacitor with a capacitance withstand voltage of 4000 volts.

[0020] Secondly, embodiments of this application also disclose a vehicle high-voltage system, which includes the relay status detection system provided in any of the embodiments of the first aspect described above.

[0021] Thirdly, embodiments of this application also disclose a vehicle that includes the relay status detection system provided in any of the embodiments of the first aspect, or the vehicle high-voltage system provided in the second aspect. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the relay status detection system provided in the embodiments of this application;

[0023] Figure 2 This is a schematic diagram of another relay status detection system provided in an embodiment of this application;

[0024] Figure 3 This is a circuit diagram of the relay status detection system provided in the embodiments of this application;

[0025] Figure 4 This is a schematic diagram of the structure of the vehicle high-voltage system provided in the embodiments of this application;

[0026] Figure 5 This is a schematic diagram of the structure of a vehicle provided in an embodiment of this application;

[0027] Figure 6 This is a schematic diagram of another vehicle structure provided in an embodiment of this application.

[0028] Explanation of reference numerals in the attached figures:

[0029] 100. Controller; 110. Fourth signal output terminal; 120. Fourth signal input terminal;

[0030] 200, Isolated power supply module; 210, Input positive pin; 220, Input negative pin; 230, Output positive pin; 240, Output negative pin;

[0031] 300, Isolation chip; 310, Second signal input terminal; 320, Second signal output terminal; 330, Third signal input terminal; 340, Third signal output terminal; 350, First voltage input pin; 360, Second voltage input pin;

[0032] 400, Relay; 410, First signal input terminal; 420, First signal output terminal;

[0033] 500, First capacitor;

[0034] 600, Second capacitor;

[0035] 700, First resistor;

[0036] 800, Reverse Diode;

[0037] 900, Second resistor. Detailed Implementation

[0038] As mentioned earlier, existing relay status detection solutions suffer from system complexity and high cost.

[0039] Taking new energy vehicles as an example, new energy vehicles include a high-voltage system, mainly consisting of discharge circuits, pre-charge circuits, slow charging circuits, fast charging circuits, DC / DC circuits, and even power steering circuits, power brake circuits, air conditioning circuits, and heating circuits. Each circuit contains a high-voltage relay connected in series. These high-voltage relays typically operate in high-voltage, high-current environments. If a component in the circuit malfunctions, causing the current scenario to exceed the relay's maximum segmentation capacity or maximum switching voltage, the high-voltage relay will experience a sticking fault. Therefore, relay status monitoring becomes particularly important.

[0040] Existing relay status detection solutions require independent isolated power supplies and isolation chips for each relay, making the system complex and costly. Furthermore, the presence of AC power at the relay input side can cause significant leakage current, leading to charging tripping and making them unsuitable for a wide market.

[0041] Based on this, this application provides a relay status detection system, including a controller, an isolation power supply module, an isolation chip, and multiple relays. The isolation chip is connected to the controller, the isolation power supply module, and each relay. The isolation chip is powered by an isolation power supply module to provide a voltage independent of other circuits. By connecting a multi-channel isolation chip to each relay, the controller can detect the connection status of multiple relays through the isolation chip to determine whether each relay is closed or open. The relay status detection system provided by this application uses an isolation chip to isolate signals and power, ensuring that high and low voltage systems meet safety requirements. Furthermore, by using only one isolation chip to detect the status of multiple relays, the system composition is simple, effectively reducing the cost of relay status detection.

[0042] Next, the relay status detection system provided by the implementation method of this application will be described in detail.

[0043] like Figure 1 As shown, the relay status detection system provided in this application includes a controller 100, an isolation power supply module 200, an isolation chip 300, and multiple relays 400. The isolation chip 300 is connected to the controller 100, the isolation power supply module 200, and each relay 400.

[0044] In this implementation, the isolation power module 200 is a DC-DC power module, that is, a DC-DC power conversion module, used to supply power to the isolation chip 300 to provide DC voltage to the isolation chip 300. The DC-DC power conversion module provides two types of voltage to the isolation chip 300: one is an isolation voltage to provide voltage isolation protection to the relay detection circuit, so that the voltage of the relay detection circuit is isolated from the voltage of other connected circuits of the relay, so as to avoid interference from other circuits to the relay detection circuit and to avoid damage to the relay due to circuit interference; the other is a voltage divider to provide low voltage protection to the relay detection circuit, so as to prevent the components in the relay detection circuit from being damaged by high voltage.

[0045] Furthermore, the isolation chip 300 is a digital isolation chip used for signal and power isolation of the relay status detection circuit. It also receives detection signals from the controller 100 and sends them to each relay 400, thereby obtaining the corresponding detection feedback signals from each relay 400 and sending them back to the controller 100. In this way, using the isolation chip 300 achieves signal isolation, preventing interference from other circuit signals to the relay detection and improving the accuracy of relay detection.

[0046] The controller 100 can be a micro control unit (MCU), a micro processor (MPU), or other vehicle controllers 100.

[0047] Furthermore, the controller 100 is used to send detection signals to each relay 400 through the isolation chip 300, and to obtain the detection feedback signals corresponding to each relay 400 through the isolation chip 300, so as to determine the connection status of each relay 400.

[0048] For example, when the controller 100, isolation chip 300, isolation power supply, and each relay circuit are connected, a relay detection circuit is formed: controller 100 - isolation chip 300 - each relay 400 - isolation chip 300 - controller 100. The isolation power supply module 200 supplies power to the relay detection circuit to provide isolation voltage and perform low-voltage protection. The controller 100 sends a detection signal to the isolation chip 300. The detection signal is transmitted to the relay 400 through the isolation chip 300. If the relay 400 is in the connected state, the detection signal will be transmitted to the isolation chip 300 through the relay 400. The controller 100 then obtains the detection feedback signal obtained by the isolation chip 300 to determine the connection state of the corresponding relay 400 based on the detection feedback signal.

[0049] Furthermore, in the implementation of this application, the detection signal is a pulse width modulation signal (PWM signal).

[0050] Taking four relays 400 as an example, assuming that relays 1 and 3 are in the closed state and relays 2 and 4 are in the open state, the controller 100 sends PWM signals (as an example of detection signals) to the four relays 400 through the isolation chip 300. These PWM signals return to the isolation chip 300 through relays 1 and 3 respectively. Thus, the isolation chip 300 can receive the returned PWM signals (as an example of detection feedback signals) and feed them back to the controller 100. Since relays 2 and 4 are in the open state, the detection signals cannot pass through, so the detection feedback signals obtained by each isolation chip 300 are 0, and the detection feedback signals fed back to the controller 100 are also 0.

[0051] Furthermore, such as Figure 2 As shown, each relay 400 includes a first signal input terminal 410 and a first signal output terminal 420, the isolation chip 300 includes a second signal input terminal 310, a second signal output terminal 320, and multiple third signal input terminals 330 and multiple third signal output terminals 340, and the controller 100 includes a fourth signal output terminal 110 and multiple fourth signal input terminals 120.

[0052] Specifically, the second signal input terminal 310 of the isolation chip 300 is connected to the fourth signal output terminal 110 of the controller 100, the second signal output terminal 320 of the isolation chip 300 is connected to the first signal input terminal 410 of each relay 400, each third signal input terminal 330 of the isolation chip 300 is connected to the first signal output terminal 420 of a different relay 400, and each third signal output terminal 340 of the isolation chip 300 is connected to a different fourth signal input terminal 120 of the controller 100.

[0053] It should be noted that, in the implementation of this application, the connection between the controller 100 and the isolation chip 300 can be either an electrical connection or a communication connection.

[0054] The isolation chip 300, the isolation power module 200, and the relay 400 are connected electrically.

[0055] For example, the controller 100 sends a PWM signal through the fourth signal output terminal 110. The PWM signal is transmitted through the second signal input terminal 310 of the isolation chip 300 to the first signal input terminal 410 of each relay 400 in parallel. If the relay 400 is in a closed state, the PWM signal will be transmitted to the first signal output terminal 420 of the closed relay 400, and then to the third signal input terminal 330 corresponding to each relay 400 included in the isolation chip 300. The PWM signal is then transmitted through the third signal output terminal 340 corresponding to each third signal input terminal 330 to the fourth signal input terminal 120 of the controller 100. In this way, the controller 100 can obtain the detection feedback signal of the relay 400 in a closed state. Furthermore, if the relay 400 is in the open state, the PWM signal transmission is interrupted, and the third signal input terminal 330 corresponding to the isolation chip 300 will not be able to receive the PWM signal returned by the relay 400. Then, the isolation chip 300 returns a detection feedback signal of 0 to the fourth signal input terminal 120 corresponding to the controller 100 through the corresponding third signal output terminal 340, so that the controller 100 can determine the connection status of each relay 400 according to the detection feedback signal.

[0056] Furthermore, in another implementation of this application, the relay state detection system also includes a plurality of first capacitors 500.

[0057] The first capacitor 500 corresponds to different relays 400. The isolation chip 300 is connected to the first signal input terminal 410 of the corresponding relay 400 through the second signal output terminal 320 and the first capacitor 500.

[0058] The input terminal of each first capacitor 500 is connected to the second signal output terminal 320 of the isolation chip 300, and the output terminal of each first capacitor 500 is connected to the first signal input terminal 410 of the corresponding relay 400.

[0059] Furthermore, in another implementation of this application, the relay status detection system further includes multiple second capacitors 600, each corresponding to a different relay 400. Each relay 400 is connected to the third signal input terminal 330 corresponding to the isolation chip 300 through the first signal output terminal 420 and the second capacitors 600.

[0060] The input terminal of each second capacitor 600 is connected to the first signal output terminal 420 of the corresponding relay 400, and the output terminal of each second capacitor 600 is connected to the second signal input terminal 310 of the isolation chip 300.

[0061] The first capacitor 500 and the second capacitor 600 have a voltage rating of 4000 volts.

[0062] In the implementation of this application, the relay state detection system may include only multiple first capacitors 500, multiple second capacitors 600, or multiple first capacitors 500 and multiple second capacitors 600.

[0063] Furthermore, because the voltage across the relay is very high, in the preferred implementation of this application, the relay status detection system includes multiple first capacitors 500 and multiple second capacitors 600. Each first capacitor 500 and each second capacitor 600 are respectively disposed across the corresponding relay 400 to achieve signal isolation between other circuits of the relay 400 and the relay status detection circuit. By achieving signal isolation of the connection circuits of different relays 400, the sampling signals of relays 400 at different locations are completely isolated and are not affected by the filter capacitors between the high and low voltage systems of the vehicle, thereby achieving the purpose of accurately detecting the connection status of each relay 400.

[0064] For example, the controller 100 sends a PWM signal through the fourth signal output terminal 110. The PWM signal passes through the second signal input terminal 310 of the isolation chip 300, then through the input terminals of the first capacitors 500 in parallel, and then through the output terminals of the first capacitors 500 to the first signal input terminal 410 of the corresponding relays 400 connected to the second capacitors 600. If the relays 400 are in a closed state, the PWM signal will be transmitted to the first signal output terminal 420 of the closed relays 400, and then through the input terminals and output terminals of the second capacitors 600 to the third signal input terminals 330 of the relays 400 included in the isolation chip 300. The PWM signal is then transmitted to the fourth signal input terminal 120 of the controller 100 through the third signal output terminals 340 of the third signal input terminals 330. In this way, the controller 100 can obtain the PWM signal of the corresponding relays 400 (as an example of a detection feedback signal) and thus determine that the connection state of the corresponding relays 400 is closed. Furthermore, if the relay 400 is in the open state, the PWM signal transmission is interrupted, and the first signal output terminal 420 of the relay 400 and the corresponding second capacitor 600 have no signal transmission. The third signal input terminal 330 of the isolation chip 300, which is in the open state, will not be able to receive the PWM signal returned by the relay 400. Then, the isolation chip 300 returns a detection feedback signal of 0 to the fourth signal input terminal 120 of the controller 100 based on the corresponding third signal output terminal 340, so that the controller 100 determines the connection state of the corresponding relay 400 as the open state based on the detection feedback signal.

[0065] Furthermore, in another implementation of this application, the relay status detection system further includes a first resistor 700 and a reverse diode 800, and the isolation chip 300 is connected to the input terminal of each first capacitor 500 through the first resistor 700 and the reverse diode 800.

[0066] The input terminal of the first resistor 700 is connected to the second signal output terminal 320 of the isolation chip 300, the output terminal of the first resistor 700 is connected to the input terminal of the reverse diode 800, and the output terminal of the reverse diode 800 is connected to the input terminal of each first capacitor 500.

[0067] In this implementation, the first resistor 700 is used to limit the current in the relay detection circuit to protect the isolation chip 300 and the relay 400. The reverse diode 800 is used to limit the direction of signal flow so that the detection signal is transmitted to the relay 400 via the isolation chip 300.

[0068] Furthermore, the resistance value of the first resistor 700 is in the range of 900 ohms to 1100 ohms, for example, it can be 900 ohms, 1000 ohms, 1050 ohms, or 1100 ohms. As a preferred embodiment of this application, the resistance value of the first resistor 700 is 1000 ohms.

[0069] For example, the controller 100 sends a PWM signal through the fourth signal output terminal 110. This PWM signal passes through the second signal input terminal 310 of the isolation chip 300, then through the input terminal and output terminal of the first resistor 700, the input terminal and output terminal of the reverse diode 800, and is transmitted to the input terminals of the first capacitors 500 that are in parallel. It is then transmitted via the output terminals of the first capacitors 500 to the first signal input terminal 410 of the corresponding relays 400 connected to each of the second capacitors 600. If the relays 400 are in a closed state, the PWM signal... The signal is transmitted to the first signal output terminal 420 of the relay 400, which is in the closed state, and then through the input terminal and the output terminal of the second capacitor 600 to the third signal input terminal 330 of each relay 400 included in the isolation chip 300. The PWM signal is then transmitted to the fourth signal input terminal 120 of the controller 100 through the third signal output terminal 340 of each third signal input terminal 330. In this way, the controller 100 can obtain the PWM signal of the corresponding relay 400 (as an example of a detection feedback signal) and thus determine that the connection state of the corresponding relay 400 is closed. Furthermore, if the relay 400 is in the open state, the PWM signal transmission is interrupted, and the first signal output terminal 420 of the relay 400 and the corresponding second capacitor 600 have no signal transmission. The third signal input terminal 330 of the isolation chip 300, which is in the open state, will not be able to receive the PWM signal returned by the relay 400. Then, the isolation chip 300 returns a detection feedback signal of 0 to the fourth signal input terminal 120 of the controller 100 based on the corresponding third signal output terminal 340, so that the controller 100 determines the connection state of the corresponding relay 400 as the open state based on the detection feedback signal.

[0070] Furthermore, in the implementation of this application, the relay state detection system also includes multiple second resistors 900, each second resistor 900 corresponding to a different second capacitor 600.

[0071] One end of each second resistor 900 is connected to the output terminal of the corresponding second capacitor 600, and the other end of each second resistor 900 is grounded.

[0072] In this implementation, each second resistor 900 is used to divide the voltage or limit the current of the corresponding circuit to protect the relay 400 on the corresponding circuit.

[0073] It should be noted that, in this implementation, the other end of the second resistor 900 is grounded as a signal ground, which means that the other end of the second resistor 900 is in an equipotential state.

[0074] Furthermore, in the implementation of this application, the DC-DC power supply module includes an input positive pin 210, an input negative pin 220, an output positive pin 230, and an output negative pin 240.

[0075] The isolation chip 300 includes a first voltage input pin 350 and a second voltage input pin 360. The positive input pin 210 of the DC-DC power module is connected to the first voltage input pin 350 of the isolation chip 300, and the negative input pin 220 of the DC-DC power module is grounded to achieve low-voltage protection for the isolation chip 300.

[0076] The positive output pin 230 of the DC-DC power module is connected to the second voltage input pin 360 of the isolation chip 300, and the negative output pin 240 of the DC-DC power module is grounded to provide isolation voltage to the isolation chip 300 and ensure that the isolation chip 300 works normally.

[0077] It should be noted that in this implementation, the output negative pin 240 is grounded as a signal ground, that is, the output negative pin 240 is in an equipotential state.

[0078] In this application, the PWM signal is a high-frequency PWM signal, that is, a PWM signal continuously sent by the controller 100 at a fixed frequency.

[0079] It should be noted that in the implementation of this application, the number of the first capacitor 500, the second capacitor 600 and the second resistor 900 are the same as the number of relays 400. That is, the first capacitor 500 and the second capacitor 600 are connected to the relays 400 in a one-to-one relationship, and the second resistor 900 is connected to the second capacitor 600 in a one-to-one relationship.

[0080] Furthermore, the third signal input terminal 330 of the isolation chip 300 is connected to the first signal output terminal 420 of each relay 400 in a one-to-one relationship, and the third signal output terminal 340 of the isolation chip 300 is connected to the fourth signal input terminal 120 of the controller 100 in a one-to-one relationship.

[0081] Furthermore, the fourth signal input terminal 120 is the signal input interface (i.e., ADC port) of the analog-to-digital converter (ADC) of the controller 100.

[0082] For example, the isolation chip 300 transmits the detection feedback signal via the third signal output port to the input interface of the analog-to-digital converter corresponding to each of the third signal output ports 340 included in the controller 100.

[0083] The following is combined Figure 3 Taking the controller 100 as an MCU as an example, the process and principle of the controller 100 performing relay status detection in the implementation of this application will be explained.

[0084] The MCU sends a high-frequency PWM signal to the isolation chip 300 via the PWM port (for example, the fourth signal output port 110). This signal is then transmitted to the high-voltage side via the PWM signal input port (for example, the second signal input port 310) and the PWM signal output port (for example, the second signal output port 320) of the isolation chip 300. After passing through R1 (for example, the first resistor 700) and D1 (for example, the reverse diode 800), the PWM signal remains a high-frequency PWM signal and reaches the left side (i.e., the input terminal) of C1-C4 (for example, the first capacitor 500). Based on the capacitor's characteristic of passing high frequencies and blocking low frequencies, the PWM signal is routed to the right side (i.e., the output terminal) of C1-C4. When any of the relays 400 (Rly1-Rly4, as an example of relay 400) is in the closed state, the PWM signal will reach the return pin of the isolation chip 300 (as an example of the third signal input terminal 330) through the corresponding capacitors of C5-C8 (as an example of the second capacitor 600) connected to the closed relay 400. Finally, the isolation chip 300 generates RLY1_ST to RLY4_ST level signals (as an example of the detection feedback signal) and reaches the ADC port of the MCU (as an example of the fourth signal input terminal 120) through the signal output pin (as an example of the third signal output terminal 340). The MCU determines the connection state of the relay 400 by recognizing these four level signals.

[0085] As shown in Table 1, Table 1 is a table corresponding to the detection feedback signal and the connection status of the relay.

[0086] Table 1 Correspondence between detection feedback signals and relay connection status

[0087] Relay connection status MCU acquired values Closed state Fixed-frequency high-frequency PWM signal wave Disconnected 0

[0088] If the relay is in a closed state, the detection feedback signal (i.e., the MCU acquisition value) is a high-frequency PWM signal wave with a fixed frequency. If the relay is in a disconnected state, the detection feedback signal acquired by the MCU is 0.

[0089] The relay status detection system provided in this application primarily utilizes dual isolation via a digital isolation chip and safety capacitors. Leveraging the capacitor's characteristic of passing AC while blocking DC, a PWM signal wave is sent to one end of the relay and sampled back from the other end. Because the signal circuit is completely isolated from other circuits of the vehicle's high-voltage system by capacitors, the influence of other circuits in the high-voltage system on the relay status detection circuit is avoided. Furthermore, through an isolated power supply module and a multi-channel digital isolation chip, combined with safety capacitors, signal isolation is achieved. By employing a high-frequency signal transmission-reception method, high-precision identification of the relay's open / closed state is realized at low cost using the MCU's ADC port.

[0090] The embodiments of this application also disclose a vehicle high-voltage system, such as Figure 4 As shown, the vehicle's high-voltage system includes the relay status detection system provided in the above-described embodiment. Thus, by employing the relay status detection system provided in this application embodiment, the status of each relay in the vehicle's high-voltage system can be detected, enabling efficient and accurate identification of faults in the circuits where the relays are located.

[0091] The embodiments of this application also disclose a vehicle, such as Figure 5 As shown, the vehicle includes the relay status detection system provided in the above embodiments. Thus, by employing the relay status detection system provided in this application, the status of each relay in the vehicle can be detected, enabling efficient and accurate identification of faults in the circuits where the relays are located.

[0092] The embodiments of this application also disclose a vehicle, such as Figure 6 As shown, the vehicle includes a vehicle high-voltage system. Thus, using the vehicle high-voltage system provided in this application embodiment, the status of each relay in the vehicle can be detected, and faults in the circuits where the relays are located can be identified efficiently and accurately.

[0093] It should be noted that, in addition to the specific embodiments described above, those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Although the description of this application is presented in conjunction with preferred embodiments, this does not mean that the features of this utility model are limited to that embodiment. On the contrary, the purpose of describing the utility model in conjunction with the embodiments is to cover other options or modifications that may be extended based on the technical solutions of this application. In order to provide a deep understanding of this application, many specific details are included in the above description, and this application may also be implemented without using these details. In addition, in order to avoid confusion or obscuring the focus of this application, some specific details will be omitted in the description. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other.

[0094] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0095] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0096] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.

[0097] Although this application has been illustrated and described with reference to certain preferred embodiments, those skilled in the art should understand that the above description is a further detailed explanation of the application in conjunction with specific embodiments, and should not be construed as limiting the specific implementation of the application to these descriptions. Those skilled in the art can make various changes in form and detail, including some simple deductions or substitutions, without departing from the spirit and scope of this application.

Claims

1. A relay status detection system, characterized in that, The relay status detection system includes a controller, an isolated power supply module, an isolation chip, and multiple relays, wherein... The isolation chip is connected to the controller, the isolation power module, and each of the relays respectively; The isolation power module is used to supply power to the isolation chip; The controller is used to send detection signals to each of the relays through the isolation chip, and to obtain the detection feedback signals corresponding to each of the relays through the isolation chip, so as to determine the connection status of each of the relays, wherein the connection status is a closed state or an open state.

2. The relay status detection system according to claim 1, characterized in that, Each of the relays includes a first signal input terminal and a first signal output terminal; the isolation chip includes a second signal input terminal, a second signal output terminal, and multiple third signal input terminals and multiple third signal output terminals; the controller includes a fourth signal output terminal and multiple fourth signal input terminals, wherein... The second signal input terminal of the isolation chip is connected to the fourth signal output terminal of the controller, the second signal output terminal of the isolation chip is connected to the first signal input terminal of each of the relays, each third signal input terminal of the isolation chip is connected to the first signal output terminal of a different relay, and each third signal output terminal of the isolation chip is connected to a different fourth signal input terminal of the controller.

3. The relay status detection system according to claim 2, characterized in that, The relay status detection system further includes multiple first capacitors and multiple second capacitors. Each first capacitor corresponds to a different relay, and each second capacitor corresponds to a different relay. The isolation chip is connected to the first signal input terminal of the corresponding relay via the second signal output terminal and the first capacitor. Each relay is connected to the third signal input terminal of the isolation chip via the first signal output terminal and the second capacitor. Specifically, the input terminal of each first capacitor is connected to the second signal output terminal of the isolation chip, the output terminal of each first capacitor is connected to the first signal input terminal of the corresponding relay, the input terminal of each second capacitor is connected to the first signal output terminal of the corresponding relay, and the output terminal of each second capacitor is connected to the corresponding second signal input terminal.

4. The relay status detection system according to claim 3, characterized in that, The relay status detection system further includes a first resistor and a reverse diode. The isolation chip is connected to the input terminal of each of the first capacitors through the first resistor and the reverse diode. The input terminal of the first resistor is connected to the second signal output terminal of the isolation chip, the output terminal of the first resistor is connected to the input terminal of the reverse diode, and the output terminal of the reverse diode is connected to the input terminal of each of the first capacitors.

5. The relay status detection system according to claim 4, characterized in that, The relay status detection system also includes a plurality of second resistors, each of which corresponds to a different second capacitor. One end of each second resistor is connected to the output terminal of the corresponding second capacitor, and the other end of each second resistor is grounded.

6. The relay status detection system according to claim 5, characterized in that, The isolated power supply module is a DC-DC power supply module, which includes an input positive pin, an input negative pin, an output positive pin, and an output negative pin. The isolation chip includes a first voltage input pin and a second voltage input pin. The input positive pin of the DC-DC power supply module is connected to the first voltage input pin of the isolation chip, and the output positive pin of the DC-DC power supply module is connected to the second voltage input pin of the isolation chip. The input negative pin and the output negative pin of the DC-DC power supply module are grounded.

7. The relay status detection system according to claim 6, characterized in that, The detection signal is a pulse width modulation signal, and the fourth signal input terminal is the signal input interface of the analog-to-digital converter of the controller.

8. The relay status detection system according to claim 7, characterized in that, The resistance of the first resistor is in the range of 900 ohms to 1100 ohms, and the capacitance of the first capacitor and the second capacitor is 4000 volts.

9. A vehicle high-voltage system, characterized in that, The vehicle high-voltage system includes a relay status detection system as described in any one of claims 1-8.

10. A vehicle, characterized in that, The vehicle includes a relay status detection system as described in any one of claims 1-8, or a vehicle high-voltage system as described in claim 9.

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