Relay detection circuit, method and high voltage circuitry

Abstract

The application discloses a relay detection circuit, a method and high-voltage circuit system, the circuit comprises: a control module, the control module is electrically connected with a driving component of a relay, the control module is used for driving the driving component to control the switch of the relay to be turned on or turned off; a pre-charging module, a first end of the pre-charging module is electrically connected with a positive DC bus, and a second end of the pre-charging module is electrically connected with a DC output end, wherein the DC output end is used for connecting a load; a state detection module, a first end of the state detection module is electrically connected with the positive DC bus and a first end of a switch of the relay, and a second end of the state detection module is electrically connected with the DC output end and a second end of the switch of the relay, and the state detection module is used for outputting a relay state detection signal based on a voltage between the first end of the switch of the relay and the second end of the switch, and the above-mentioned circuit can improve the accuracy of state detection of the switch of the relay.

Description

Technical Field

[0001] This application belongs to the field of high voltage circuit system technology, and in particular relates to a relay detection circuit, method and high voltage circuit system. Background Technology

[0002] In high-voltage circuit systems, such as the power battery system or energy storage converter of electric vehicles, relays are the core safety and control components, responsible for connecting or disconnecting the high-voltage electricity in the main circuit.

[0003] Over long-term use, relays may experience contact adhesion failures due to arc erosion (i.e., the switch in the relay cannot be disconnected). These failures can lead to system malfunction and pose serious safety hazards. Therefore, real-time and reliable monitoring of the relay's switching status is crucial.

[0004] Currently, common detection methods often involve detecting the current signal output by a relay and comparing it to a threshold to determine its state. However, the current threshold in this method varies with the load, which may lead to misjudgments of the relay's switching state, resulting in low accuracy in detecting the state of the relay's switches. Summary of the Invention

[0005] This application provides a relay detection circuit, method, and high-voltage circuit system that can improve the accuracy of relay status detection.

[0006] In a first aspect, embodiments of this application provide a relay detection circuit, including:

[0007] The control module is electrically connected to the relay drive component. The control module is used to drive the drive component to control the relay to turn on or off.

[0008] The precharge module has its first terminal electrically connected to the positive DC bus and its second terminal electrically connected to the DC output terminal, which is used to connect to the load.

[0009] The status detection module has its first terminal electrically connected to both the positive DC bus and the first terminal of the relay switch, and its second terminal electrically connected to both the DC output terminal and the second terminal of the relay switch. The status detection module is used to output a relay status detection signal based on the voltage between the first and second terminals of the relay switch.

[0010] The relay detection circuit is configured as follows:

[0011] In the first period after the positive DC bus is powered on, when the control module drives the drive component to open the relay switch, the relay status detection signal output by the status detection module is acquired; if the relay status detection signal indicates that the relay switch is on, a fault is determined in the positive DC bus, the precharge module, or the status detection module; or,

[0012] In the second period after the positive DC bus is powered on, when the control module drives the drive component to control the relay switch to be turned on, the relay status detection signal output by the status detection module is acquired; if it is determined that the relay status detection signal indicates that the relay switch is open, a relay fault is determined, wherein the second period is later than the first period.

[0013] Secondly, embodiments of this application provide a relay detection method, including:

[0014] In the first period after the positive DC bus is powered on, when the control module drives the relay to open the relay switch, the relay status detection signal output by the status detection module is acquired.

[0015] If the relay status detection signal indicates that the relay switch is on, then a fault is determined to be in the positive DC bus, precharge module, or status detection module; or,

[0016] In the second period after the positive DC bus is powered on, when the control module drives the drive component to control the relay switch to be turned on, the relay status detection signal output by the status detection module is acquired.

[0017] If the relay status detection signal indicates that the relay switch is open, a relay fault is determined, wherein the second time period is later than the first time period.

[0018] Thirdly, embodiments of this application provide a high-voltage circuit system, including:

[0019] DC bus, relay, and relay detection circuit as described in any of the first aspects above;

[0020] The relay is located between the positive DC bus and the first end of the load, and the second end of the load is electrically connected to the negative DC bus.

[0021] Fourthly, embodiments of this application provide an electronic device, the device comprising:

[0022] Processor and memory storing computer program instructions;

[0023] The processor executes the relay detection method described in the second aspect when executing computer program instructions.

[0024] Fifthly, embodiments of this application provide a computer storage medium storing computer program instructions, which, when executed by a processor, implement the relay detection method of the second aspect described above.

[0025] Sixthly, embodiments of this application provide a computer program product, including a computer program that, when processed by a processor, implements the relay detection method of the second aspect described above.

[0026] The relay detection circuit, method, and high-voltage circuit system provided in this application determine the status of a relay by directly acquiring the voltage signal across the relay switch using a status detection module. This method directly reflects whether the relay switch is on or off, enabling accurate detection of relay contact sticking faults and engagement failure faults, greatly improving the reliability of fault diagnosis. Simultaneously, in the first time period, the relay status detection signal output by the status detection module can also detect whether the positive DC bus, pre-charge module, and status detection module are in the target state (fault state), achieving "one detection, multiple effects." In the second time period, the relay status detection signal can directly determine whether the switch in the relay is faulty, enabling rapid fault diagnosis and facilitating the safe and stable operation of the high-voltage system. Furthermore, the circuit structure is simple and easy to implement, possessing high application value. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of a high-voltage system provided for some embodiments of this application.

[0029] Figure 2 This is a schematic diagram of a relay detection circuit provided for some embodiments of this application.

[0030] Figure 3 This is a schematic diagram of another relay detection circuit provided in some embodiments of this application.

[0031] Figure 4 This is a flowchart illustrating a relay detection method provided in some embodiments of this application.

[0032] Figure 5 This is a schematic diagram of the structure of a high-voltage circuit system provided for some embodiments of this application.

[0033] Figure 6This is a schematic diagram of the hardware structure of an electronic device provided in an embodiment of this application. Detailed Implementation

[0034] The features and exemplary embodiments of various aspects of this application will be described in detail below. To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain this application and not to limit it. For those skilled in the art, this application can be implemented without some of these specific details. The following description of the embodiments is merely to provide a better understanding of this application by illustrating examples.

[0035] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0036] Before describing the technical solutions provided in the embodiments of this application, in order to facilitate understanding of the embodiments of this application, this application first specifically explains the problems existing in the related technologies:

[0037] like Figure 1 , Figure 1 This is a schematic diagram of a common high-voltage system in the prior art. The high-voltage circuit system includes a DC bus, which is regarded as a power supply. The main positive relay 101 is electrically connected to the positive DC bus, the main negative relay 102 is electrically connected to the negative DC bus, and the load 103 is disposed between the main positive relay 101 and the main negative relay 102.

[0038] Normally, after the DC bus is powered on, the switch in the main positive relay 101 needs to be opened, allowing the current in the DC bus to precharge the capacitor C at the load end through the precharge circuit of the precharge relay 104. After a preset time period, the switch in the main positive relay 101 is turned on, allowing the DC bus to supply power to the load normally. Because the opening and closing of the switch in the main positive relay 101 needs to be controlled, the state detection of the switch in the relay is particularly important.

[0039] Existing technologies often rely on, such as Figure 1 The detection circuit shown samples the current output by the main positive relay, amplifies it through a differential amplifier 105, and then performs analog-to-digital conversion through an analog-to-digital converter module 106 to obtain a current signal. The state of the switch in the main positive relay 101 is determined by comparing the current signal with a preset threshold. However, due to different connected loads, the preset current threshold will vary with the load. This means the above determination method may lead to misjudgments of the switch state of the main positive relay 101, resulting in low accuracy in determining the relay switch state.

[0040] Based on this, embodiments of this application provide a relay detection circuit, method, and high-voltage circuit system that can solve the above problems.

[0041] The following is a detailed description of a relay detection circuit provided in the embodiments of this application.

[0042] like Figure 2 As shown, this application embodiment provides a relay detection circuit 200, which may include:

[0043] The control module 202 is electrically connected to the drive component 2011 of the relay 201. The control module 202 is used to drive the drive component 2011 to control the switch 2012 of the relay to be turned on or off.

[0044] Here, the relay 201 may include a driving component 2011 and a switch 2012. The driving component 2011 can control the switch 2012 to be turned on or off under the drive of the control module 202.

[0045] For example, when the drive component 2011 includes a coil, the control module 202 can control the switch 2012 to be turned on or off by controlling the drive component 2011 to be energized or de-energized.

[0046] The precharge module 203 has its first end electrically connected to the positive DC bus HV1 and its second end electrically connected to the DC output terminal HV2, which is used to connect to the load.

[0047] Here, the aforementioned pre-charge module is used to pre-charge the DC bus during the first period after it is powered on, i.e., the preset period, thereby protecting the circuit.

[0048] The status detection module 204 has its first terminal electrically connected to both the positive DC bus HV1 and the first terminal of the switch 2012 of the relay 201, and its second terminal electrically connected to both the DC output terminal HV2 and the second terminal of the switch 2012 of the relay 201. The status detection module 204 is used to output a relay status detection signal based on the voltage between the first terminal and the second terminal of the switch 2012 of the relay 201.

[0049] Here, the state detection module 204 may include an isolation detection unit. The two ends of the primary side of the isolation detection unit are set at the two ends of the switch 2012 of the relay 201. One end of the secondary side is electrically connected to the power supply, and the other end is electrically connected to the reference voltage terminal GND and is used to output a relay detection signal. When the switch 2012 is turned on, the primary side of the isolation detection unit is short-circuited, and the switch on the secondary side will be turned off. The relay state detection signal output by the isolation detection unit is low level. When the switch 2012 is turned off, the primary side of the isolation detection unit is energized to control the switch on the secondary side to turn on, and the relay state detection signal output by the isolation detection unit is high level. That is, the switch 2012 is in the off state or the on state by the output of a high level or a low level by the state detection module 204.

[0050] In some examples, the aforementioned state detection module may include a comparator. The state detection module 204 acquires the voltage across the switch 2012 and compares the sampled voltage with the reference voltage inside the voltage comparator. Finally, it outputs a digital level signal as a relay state detection signal. For example, a high level output indicates that the voltage across the switch is high, i.e., the switch 2012 is open, and a low level output indicates that the voltage across the switch is low, i.e., the switch 2012 is on.

[0051] The relay detection circuit is configured as follows:

[0052] In the first period after the positive DC bus HV1 is powered on, when the control module 202 drives the drive component 2011 to control the switch 2012 of the relay 201 to open, the status detection signal of the relay 201 output by the status detection module 204 is acquired; if it is determined that the status detection signal of the relay 201 indicates that the switch of the relay 201 is turned on, the positive DC bus HV1, the precharge module 203, or the status detection module 204 is faulty; or, in the second period after the positive DC bus HV1 is powered on, when the control module 202 drives the drive component 2011 to control the switch of the relay 201 to turn on, the status detection signal of the relay 201 output by the status detection module 204 is acquired; if it is determined that the status detection signal of the relay 201 indicates that the switch 2012 of the relay 201 is turned off, the relay 201 is faulty, wherein the second period is later than the first period.

[0053] During the pre-charge phase after the positive DC bus HV1 is powered on and before the switch 2012 of relay 201 closes (i.e., the first time period), the control module 202 can output an invalid or low level to keep the switch 2012 of relay 201 in the open state. At this time, the relay status detection signal output by the status detection module 204 can be obtained.

[0054] Because switch 2012 is open, the high-voltage bus HV1 cannot reach HV2 through the main circuit of relay 201. At this time, the current should only pre-charge the capacitor at the load end through the pre-charge module 203. Therefore, the voltage difference across switch 2012 is high. The above relay status detection signal theoretically indicates that switch 2012 is open. However, if the actual received relay status detection signal indicates that switch 2012 is on, this indicates that the voltage output from the positive DC bus HV1 may have reached HV2 through an unexpected path, thus indicating a fault in the positive DC bus HV1, the pre-charge module 203, or the status detection module 204.

[0055] Alternatively, in the second time period, the control module 202 outputs a valid drive signal, driving the switch 2012 of the relay 201 to turn on. If the relay status detection signal obtained at this time indicates that the switch 2012 is open, it means that although a closing command has been issued, the switch 2012 has failed to close successfully. This directly indicates that the relay 201 itself is faulty, for example, the drive component 2011 is damaged, or the switch contacts are stuck in the open position.

[0056] This application embodiment, by setting up a control module, a pre-charge module, and a status detection module, determines the potential fault states of the DC bus, pre-charge module, and status detection module based on the relay status detection signal when the switch is turned on during a first time period (the period when the relay switch should theoretically be turned on) and the relay status detection signal when the switch is turned off during a second time period. Furthermore, it determines the relay fault based on the relay status detection signal when the switch is turned off during a second time period. Through this time-segmented detection, the system can effectively distinguish and locate different fault types during system startup. Simultaneously, by performing relay status detection based on the voltage across the relay terminals, it eliminates the need for multiple different thresholds based on different loads, as is done in existing technologies, thus improving the accuracy of relay status detection.

[0057] In some embodiments, such as Figure 3 As shown, the status detection module 204 includes:

[0058] The isolation detection unit 2043 has the following characteristics: the first terminal on the primary side of the isolation detection unit 2043 is electrically connected to both the positive DC bus and the first terminal of the relay switch; the second terminal on the primary side of the isolation detection unit 2043 is electrically connected to both the DC output terminal and the second terminal of the relay switch; the first terminal on the secondary side of the isolation detection unit 2043 is electrically connected to the first power supply VCC1; the second terminal on the secondary side of the isolation detection unit 2043 is electrically connected to the reference voltage terminal GND; and the second terminal on the secondary side of the isolation detection unit 2043 is used to output a relay status detection signal.

[0059] like Figure 3 As shown, the status detection module 204 may include an isolation detection unit 2043, which may include devices such as optocouplers, capacitive isolation amplifiers or magnetic isolation amplifiers to achieve electrical isolation. Preferably, to improve the timeliness of detecting the status of the relay, an optocoupler may be used.

[0060] like Figure 3 Taking the isolation detection unit 2043, which includes an optocoupler, as an example, when switch 2012 is open, current flows through the primary side of the isolation detection unit, meaning the light-emitting element 2041 positioned between the two ends of the primary side will emit light. The switch 2042 on the secondary side will then conduct, causing the second terminal of the secondary side to output a high level. Alternatively, when switch 2012 is on, the isolation detection unit will be short-circuited, and no current flows through the primary side of the isolation detection unit. Therefore, the light-emitting element 2041 positioned between the two ends of the primary side will not emit light, and the switch 2042 on the secondary side will open, causing the second terminal of the secondary side to output a low level.

[0061] Therefore, when the relay status detection signal is high, it indicates that switch 2012 of relay 201 is open; when it is low, it indicates that switch 2012 of relay 201 is on. In the first time period, if the relay status detection module is low, a possible fault in the DC bus, precharge module, or status detection module can be determined. In the second time period, if the relay status detection module is high, a relay fault is determined based on the relay status detection signal indicating that the switch is open.

[0062] This application embodiment, by setting the status detection module to include an isolation detection unit, can achieve electrical isolation between the high-voltage bus and the secondary side of the isolation detection unit. This can avoid interference of the high-voltage signal on the hub status detection signal, which is beneficial to improving the accuracy of status detection of relays. At the same time, the isolation detection unit has a fast response speed and can detect possible faults in the circuit in a timely manner, which is beneficial for users to disconnect the faulty circuit in time and avoid the fault from spreading.

[0063] In some embodiments, such as Figure 3 As shown, the status detection module 204 also includes:

[0064] The first rectifier unit 301 has its first terminal electrically connected to the first terminal of the relay switch, and its second terminal electrically connected to the first terminal of the primary side of the isolation detection unit 2043; the second rectifier unit 302 has its first terminal electrically connected to the second terminal of the primary side of the isolation detection unit 2043, and its second terminal electrically connected to the second terminal of the relay switch 2012.

[0065] Here, both the first rectifier unit 301 and the second rectifier unit 302 mentioned above may include an integrated circuit with unidirectional conduction function, or a unidirectional conduction element such as a diode.

[0066] By setting the first rectifier unit and the second rectifier unit as described above, the current direction on the primary side of the isolation detection unit can be kept unique, thereby improving the accuracy of the relay detection signal output by the isolation detection unit and thus improving the accuracy of the detection of the relay's switching state.

[0067] In some embodiments, such as Figure 3 As shown, the first rectifier unit 301 includes a first unidirectional conducting element D1, and the second rectifier unit 302 includes a second unidirectional conducting element D2.

[0068] The status detection module 204 also includes:

[0069] The first current limiting module 303 has its first end electrically connected to the first end of the switch 2012 of the relay 201, its second end electrically connected to the anode of the first unidirectional conducting element D1, its cathode electrically connected to the first end of the primary side of the isolation detection unit 2043, and its second end electrically connected to the anode of the second unidirectional conducting element.

[0070] The second current limiting module 304 has its first end electrically connected to the cathode of the second unidirectional conducting element D2, and its second end electrically connected to the second end of the switch 2012 of the relay 201; wherein the first current limiting module 303 includes at least one first resistor R1, and the second current limiting module 304 includes at least one second resistor R2.

[0071] The first rectifier unit 301 may include a first unidirectional conducting element D1, such as a diode. The anode of D1 serves as the input terminal of the first rectifier unit, and the cathode of D1 serves as the output terminal of the first rectifier unit. The second rectifier unit 302 may include a second unidirectional conducting element D2, such as a diode. The anode of D2 serves as the input terminal of the second rectifier unit, and the cathode of D2 serves as the output terminal of the second rectifier unit.

[0072] The first current limiting module 303 may include at least one first resistor R1. A first terminal of the first current limiting module 303 is electrically connected to the first terminal of the switch 2012 of the relay 201 and the positive DC bus HV1, and its second terminal is electrically connected to the anode of the first unidirectional conducting element D1. The second current limiting module 304 may include at least one second resistor R2. A first terminal of the second current limiting module 304 is electrically connected to the cathode of the second unidirectional conducting element D2, and its second terminal is electrically connected to the second terminal of the switch 2012 of the relay 201 and the DC output terminal HV2.

[0073] In this embodiment of the application, when the first rectifier unit includes a first unidirectional conducting element and the second rectifier unit includes a second unidirectional conducting element, by setting a first current limiting module and a second current limiting module, it is possible to prevent high voltage from being directly applied to the unidirectional conducting element, causing the unidirectional conducting element to break down and thus affecting the function of the components in the protection circuit.

[0074] In some embodiments, such as Figure 3 As shown, the status detection module 204 also includes:

[0075] The anode of the third unidirectional conducting element D3 is electrically connected to the second terminal of the second current limiting module 304, and the cathode of the third unidirectional conducting element D3 is electrically connected to the first terminal of the primary side of the isolation detection unit 2043.

[0076] The fourth unidirectional conducting element D4 has its anode electrically connected to the second terminal of the primary side of the isolation detection unit 2043, and its cathode electrically connected to the second terminal of the first current limiting module 303.

[0077] The third unidirectional conducting element D3 can be a diode, and the fourth unidirectional conducting element D4 can also be a diode.

[0078] By providing a third and a fourth unidirectional conducting element, the embodiments of this application ensure that the current flowing through the primary side of the isolation detection unit always maintains a single direction, thereby guaranteeing the correct operation of the isolation detection unit and improving the accuracy of detecting the switching status of the relay.

[0079] In some embodiments, such as Figure 3 As shown, the status detection module 204 also includes:

[0080] The first filter module 305 has its first end electrically connected to the first end of the primary side of the isolation detection unit 2043, and its second end electrically connected to the second end of the primary side of the isolation detection unit 2043.

[0081] like Figure 3 As shown, the first filter module 305 may include a resistor R and a capacitor C.

[0082] The second filtering module 306 has its first end electrically connected to the first end of the secondary side of the isolation detection unit, and its second end electrically connected to the second end of the secondary side of the isolation detection unit.

[0083] like Figure 3 The second filter module 306 may include a second capacitor C2.

[0084] The third filtering module 307 includes a third resistor R3, a fourth resistor R4, and a first capacitor C1. The third resistor R3 is located between the second terminal of the secondary side of the isolation detection unit 2043 and the reference voltage terminal GND. The first terminal of the fourth resistor R4 is electrically connected to the second terminal of the secondary side of the isolation detection unit 2043, and the second terminal of the fourth resistor R4 is used to output a relay status detection signal. The first capacitor C1 is located between the second terminal of the fourth resistor R4 and the reference voltage terminal GND.

[0085] By setting up the above-mentioned multiple filtering modules, the primary and secondary sides of the isolation detection unit can be filtered separately to avoid interference with the relay detection signal and enable the relay detection signal to accurately reflect the switching state of the relay.

[0086] In some embodiments, the state detection module 204 further includes a current-limiting resistor R5, which is disposed between the first power supply Vcc1 and the first terminal of the secondary side of the isolation detection unit 2043. By setting the current-limiting resistor, the current on the secondary side of the isolation detection unit can be limited, thereby protecting the circuit components.

[0087] In some embodiments, such as Figure 3 As shown, the driving component 2011 includes a coil, and the control module 202 may include:

[0088] The driver chip 308 is used to output drive signals;

[0089] The first switch U1 has its control terminal electrically connected to the driver chip 308, its first terminal electrically connected to the second terminal of the coil, its second terminal electrically connected to the reference voltage terminal GND, and its first terminal electrically connected to the second power supply Vcc2.

[0090] The relay detection circuit is configured as follows:

[0091] In the first time period, the driver chip 308 outputs a first drive signal, and the first switch U1 opens in response to the first drive signal, thereby de-energizing the coil and opening the switch 2012 of the relay 201; or,

[0092] During the second time period, the driver chip 308 outputs a second drive signal, and the first switch U1 responds to the second drive signal to turn on, so that the coil is energized and the switch 2012 of the relay 201 is turned on.

[0093] The aforementioned first switch U1 may include a transistor, and the first switch U1 can be turned on or off based on the drive signal output by the driver chip. During the first time period, the driver chip 308 in the control module 202 outputs a first drive signal, and the first switch U1 turns off in response to this first drive signal. Since the first switch U1 is off, the current loop of the relay coil is cut off, the coil is de-energized, and thus the switch 2012 of the relay 201 is opened. In this state, the relay status detection signal output by the status detection module 204 can be acquired. If the detected relay status detection signal indicates that the switch 2012 is on, then it is determined that the positive DC bus HV1, the precharge module 203, or the status detection module 204 is faulty.

[0094] Alternatively, during the second time period, the driver chip 308 in the control module 202 outputs a second drive signal, and the first switch U1 turns on in response to this second drive signal. Since the first switch U1 is on, the relay coil forms a complete circuit via Vcc2 - coil - first switch U1 - GND, energizing the coil and thus turning on the switch 2012 of the relay 201. In this state, the relay status detection signal output by the status detection module 204 is acquired. If the relay status detection signal indicates that the switch 2012 is off, then a fault in the relay 201 is determined.

[0095] This application embodiment sets up a driver chip and a first switch. The driver chip controls the first switch to control the coil in the relay to be energized or de-energized, thereby controlling the relay switch to be turned on or off. This can achieve precise control of the relay coil current and improve the safety and lifespan of the entire drive circuit.

[0096] In some embodiments, such as Figure 3 As shown, the control module 202 may further include a fourth filter module 401. The fourth filter module 401 may include a third capacitor C3 and a fourth capacitor C4 disposed between the second power supply Vcc2 and the control terminal of the first switch U1. A fifth filter module 402 may also be provided, disposed between the control terminal of the first switch U1 and the reference voltage terminal GND. The fifth filter module 402 may include a fifth capacitor C5 and a resistor R6. By providing the fourth filter module, interference from power fluctuations to the first switch can be prevented. By providing the fifth filter module, interference from external signals to the first switch can be prevented, thereby ensuring that the first switch can respond promptly to the drive signal output by the driver chip to turn on or off, thus ensuring circuit stability.

[0097] In some embodiments, such as Figure 3 As shown, the control module may also include diode D5. By setting the reverse cutoff function of D5, the voltage of the second power supply Vcc2 can only be transmitted to the first terminal of the first switch U1 when the first switch U1 is turned on.

[0098] In some embodiments, such as Figure 3 As shown, a resistor R7 can be set between the driver chip 308 and the control terminal of the first switch U1. By setting the resistor R7, the current at the control terminal of the first switch can be limited to prevent the first switch from being broken down.

[0099] In some embodiments, such as Figure 3 As shown, the precharge module 203 includes at least one precharge resistor R8, which is connected in series between the positive DC bus and the DC output terminal.

[0100] This application embodiment uses a pre-charge resistor as a pre-charge module to replace the pre-charge relay in the prior art, which can effectively reduce circuit costs while limiting current when the DC bus is powered on, so as to protect the entire circuit.

[0101] In some embodiments, such as Figure 4 As shown in the figure, this application provides a relay detection method, which may include:

[0102] S410: During the first period after the positive DC bus is powered on, when the control module drives the relay to open the relay switch, the relay status detection signal output by the status detection module is acquired.

[0103] During the first period after the positive DC bus is powered on, i.e., the pre-charge phase, the control module can drive the relay's drive component to open the relay's switch. In this state, the relay status detection signal output by the status detection module can be acquired.

[0104] Here, the relay status detection signal mentioned above is generated by the status detection module based on the voltage across the two ends of the relay switch.

[0105] S420: If the relay status detection signal indicates that the relay switch is on, determine that the positive DC bus, precharge module, or status detection module is faulty.

[0106] If the relay status detection signal indicates that the relay switch 2012 is on, this contradicts the normal expectation that the switch should be off during the pre-charge phase. Therefore, the fault lies in the positive DC bus, the pre-charge module, or the status detection module.

[0107] S430: Alternatively, during the second period after the positive DC bus is powered on, when the control module drives the drive component to control the relay switch to turn on, the relay status detection signal output by the status detection module is acquired.

[0108] During the second period after the positive DC bus is powered on, i.e., after pre-charging is complete, the control module can drive the drive component to turn on the switch of the control relay. In this state, the relay status detection signal output by the status detection module can be acquired.

[0109] S440: If the relay status detection signal indicates that the relay switch is open, a relay fault is determined, wherein the second time period is later than the first time period.

[0110] If the relay status detection signal indicates that the relay switch is open, this abnormal situation directly indicates that although the control module has issued a closing command to the relay, the switch failed to close successfully. Therefore, it is determined that the relay has malfunctioned.

[0111] This application embodiment achieves comprehensive status monitoring of the DC bus and its control and status detection module in the high-voltage system by controlling the switching of the relay to open and close in the first and second time periods, respectively, and by acquiring the relay status detection signal output by the status detection module, thereby improving the safety and operational reliability of the entire high-voltage system.

[0112] In some embodiments, such as Figure 5 As shown, this application provides a high-voltage circuit system that may include:

[0113] DC bus HV, relay 201 and relay detection circuit 200;

[0114] The relay 201 is located between the positive DC bus HV1 and the first end of the load, and the second end of the load is electrically connected to the negative DC bus HV3.

[0115] The aforementioned relay detection circuit can determine the switching state of the relay based on the relay detection signal output by the relay detection circuit in the first and second time periods, thereby identifying modules that may be faulty in the high-voltage circuit system.

[0116] The relay detection circuit described above can determine the state of the relay based on the voltage across the switch terminals.

[0117] This application embodiment enables the system to detect the state of the relay switch at different times during each power-on by setting a relay detection circuit in the high-voltage circuit system. Based on the state of the switch, it can determine possible faults, thereby enabling the system to have fault diagnosis capabilities and improving the maintainability of the system.

[0118] The relay detection system in the above embodiments is used to implement the corresponding relay detection circuit in any of the foregoing embodiments, and has the beneficial effects of the corresponding embodiments, which will not be repeated here.

[0119] Figure 6 A schematic diagram of the hardware structure of an electronic device is provided in the application embodiment.

[0120] The electronic device 600 may include a processor 601 and a memory 602 storing computer program instructions.

[0121] Specifically, the processor 601 may include a central processing unit (CPU), an application-specific integrated circuit (ASIC), or one or more integrated circuits that can be configured to implement the embodiments of this application.

[0122] Memory 602 may include mass storage for data or instructions. For example, and not limitingly, memory 602 may include a hard disk drive (HDD), floppy disk drive, flash memory, optical disk, magneto-optical disk, magnetic tape, or Universal Serial Bus (USB) drive, or a combination of two or more of these. Where appropriate, memory 602 may include removable or non-removable (or fixed) media. Where appropriate, memory 602 may be internal or external to the integrated gateway disaster recovery device. In a particular embodiment, memory 602 is non-volatile solid-state memory.

[0123] In a particular embodiment, memory 602 includes read-only memory (ROM). Where appropriate, the ROM may be a mask-programmed ROM, a programmable ROM (PROM), an erasable PROM (EPROM), an electrically erasable PROM (EEPROM), an electrically rewritable ROM (EAROM), or flash memory, or a combination of two or more of these.

[0124] Memory may include read-only memory (ROM), random access memory (RAM), disk storage media devices, optical storage media devices, flash memory devices, and electrical, optical, or other physical / tangible memory storage devices. Therefore, typically, memory includes one or more tangible (non-transitory) computer-readable storage media (e.g., memory devices) encoded with software including computer-executable instructions, and when the software is executed (e.g., by one or more processors), it is operable to perform the operations described with reference to the method according to the first aspect of this application.

[0125] The processor 601 implements any of the relay detection methods described in the above embodiments by reading and executing computer program instructions stored in the memory 602.

[0126] In one example, the electronic device may also include a communication interface 603 and a bus 604. Wherein, as... Figure 6 The processor 601, memory 602, and communication interface 603 are connected through bus 604 and complete communication with each other.

[0127] The communication interface 603 is mainly used to realize communication between various modules, devices, units and / or equipment in the embodiments of this application.

[0128] Bus 604 includes hardware, software, or both, that couples components of an online data traffic metering device together. For example, and not limitingly, the bus may include an Accelerated Graphics Port (AGP) or other graphics bus, an Enhanced Industry Standard Architecture (EISA) bus, a Front Side Bus (FSB), HyperTransport (HT) interconnect, an Industry Standard Architecture (ISA) bus, an Infinite Bandwidth Interconnect, a Low Pin Count (LPC) bus, a memory bus, a Microchannel Architecture (MCA) bus, a Peripheral Component Interconnect (PCI) bus, a PCI-Express (PCI-X) bus, a Serial Advanced Technology Attachment (SATA) bus, a Video Electronics Standards Association Local (VLB) bus, or other suitable buses, or combinations of two or more of these. Where appropriate, bus 604 may include one or more buses. Although specific buses are described and illustrated in embodiments of this application, any suitable bus or interconnect is contemplated herein.

[0129] The electronic devices described above are used to implement the corresponding relay detection methods in any of the foregoing embodiments and have the beneficial effects of the corresponding method embodiments, which will not be repeated here.

[0130] Furthermore, in conjunction with the relay detection methods in the above embodiments, this application embodiment can provide a computer storage medium for implementation. The computer storage medium stores computer program instructions; when these computer program instructions are executed by a processor, they implement any of the relay detection methods in the above embodiments.

[0131] Furthermore, in conjunction with the relay detection methods in the above embodiments, this application embodiment can provide a computer program product for implementation. When the instructions of this computer program product are executed by the processor of an electronic device, they implement any of the relay detection methods in the above embodiments.

[0132] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this application (including the claims) is limited to these examples; within the framework of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of the embodiments of this application as described above, which are not provided in the details for the sake of brevity.

[0133] The functional blocks shown in the above-described structural diagram can be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, they can be, for example, electronic circuits, application-specific integrated circuits (ASICs), appropriate firmware, plug-ins, function cards, etc. When implemented in software, the elements of this application are programs or code segments used to perform the required tasks. Programs or code segments can be stored on a machine-readable medium or transmitted over a transmission medium or communication link via data signals carried on a carrier wave. "Machine-readable medium" can include any medium capable of storing or transmitting information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, radio frequency (RF) links, etc. Code segments can be downloaded via computer networks such as the Internet, intranets, etc.

[0134] It should also be noted that the exemplary embodiments mentioned in this application describe methods or apparatuses based on a series of steps or devices. However, this application is not limited to the order of the above steps; that is, the steps can be performed in the order mentioned in the embodiments, or in a different order, or several steps can be performed simultaneously.

[0135] The aspects of this application have been described above with reference to flowchart illustrations and / or block diagrams of methods, apparatus (devices), and computer program products according to embodiments of this application. It should be understood that each block in the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing apparatus to produce a machine such that these instructions, executable via the processor of the computer or other programmable data processing apparatus, enable the implementation of the functions / actions specified in one or more blocks of the flowchart illustrations and / or block diagrams. Such a processor can be, but is not limited to, a general-purpose processor, a special-purpose processor, a special application processor, or a field-programmable logic circuit. It is also understood that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can also be implemented by dedicated hardware performing the specified functions or actions, or can be implemented by a combination of dedicated hardware and computer instructions.

[0136] The above description is merely a specific embodiment of this application. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the devices, modules, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here. It should be understood that the protection scope of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the protection scope of this application.

Claims

1. A relay detection circuit, characterized in that, include: A control module is electrically connected to the drive component of a relay. The control module is used to drive the drive component to control the switching of the relay to be on or off. The relay is a main positive relay in a DC system. A pre-charge module, wherein a first terminal of the pre-charge module is electrically connected to a positive DC bus, and a second terminal of the pre-charge module is electrically connected to a DC output terminal, wherein the DC output terminal is used to connect to a load, and the pre-charge module includes a pre-charge resistor; The status detection module has its first terminal electrically connected to the positive DC bus, the first terminal of the pre-charge resistor, and the first terminal of the relay switch. Its second terminal is electrically connected to the DC output terminal, the second terminal of the pre-charge resistor, and the second terminal of the relay switch. The status detection module is used to detect the voltage between the first terminal and the second terminal of the relay switch and output a level signal. The relay detection circuit is configured as follows: During the pre-charge phase after the positive DC bus is powered on, if the status detection module outputs a first level and determines that the relay status detection signal indicates that the main positive relay is switched on, then it is determined that the positive DC bus, the pre-charge module, or the status detection module is faulty; or... During the pre-charge completion stage after the positive DC bus is powered on, if the status detection module outputs a second level and determines that the relay status detection signal indicates that the main positive relay is switched off, then the main positive relay is determined to be faulty, wherein the first level is higher than the second level.

2. The relay detection circuit according to claim 1, characterized in that, The status detection module includes: An isolation detection unit is provided, wherein the first terminal of the primary side of the isolation detection unit is electrically connected to both the positive DC bus and the first terminal of the relay switch; the second terminal of the primary side of the isolation detection unit is electrically connected to both the DC output terminal and the second terminal of the relay switch; the first terminal of the secondary side of the isolation detection unit is electrically connected to the first power supply; the second terminal of the secondary side of the isolation detection unit is electrically connected to the reference voltage terminal; and the second terminal of the secondary side of the isolation detection unit is used to output the relay status detection signal. The first rectifier unit has its first terminal electrically connected to the first terminal of the relay switch, and its second terminal electrically connected to the first terminal of the primary side of the isolation detection unit. The second rectifier unit has its first terminal electrically connected to the second terminal of the primary side of the isolation detection unit, and its second terminal electrically connected to the second terminal of the relay switch.

3. The relay detection circuit according to claim 2, characterized in that, The first rectifier unit includes a first unidirectional conducting element, and the second rectifier unit includes a second unidirectional conducting element; The status detection module further includes: A first current limiting module, wherein a first end of the first current limiting module is electrically connected to a first end of the switch of the relay, a second end of the first current limiting module is electrically connected to the anode of the first unidirectional conducting element, the cathode of the first unidirectional conducting element is electrically connected to a first end of the primary side of the isolation detection unit, and a second end of the primary side of the isolation detection unit is electrically connected to the anode of the second unidirectional conducting element. The second current limiting module has its first end electrically connected to the cathode of the second unidirectional conducting element, and its second end electrically connected to the second end of the relay switch. The first current limiting module includes at least one first resistor, and the second current limiting module includes at least one second resistor.

4. The relay detection circuit according to claim 3, characterized in that, The status detection module further includes: The third unidirectional conducting element has its anode electrically connected to the second terminal of the second current limiting module, and its cathode electrically connected to the first terminal of the primary side of the isolation detection unit. A fourth unidirectional conducting element, wherein the anode of the fourth unidirectional conducting element is electrically connected to the second terminal of the primary side of the isolation detection unit, and the cathode of the fourth unidirectional conducting element is electrically connected to the second terminal of the first current limiting module.

5. The relay detection circuit according to claim 2, characterized in that, The status detection module further includes: A first filtering module, wherein a first end of the first filtering module is electrically connected to a first end of the primary side of the isolation detection unit, and a second end of the first filtering module is electrically connected to a second end of the primary side of the isolation detection unit; The second filtering module has its first end electrically connected to the first end of the secondary side of the isolation detection unit, and its second end electrically connected to the second end of the secondary side of the isolation detection unit. The third filtering module includes a third resistor, a fourth resistor, and a first capacitor. The third resistor is disposed between the second terminal of the secondary side of the isolation detection unit and the reference voltage terminal. The first end of the fourth resistor is electrically connected to the second end of the secondary side of the isolation detection unit, and the second end of the fourth resistor is used to output the relay status detection signal. The first capacitor is disposed between the second end of the fourth resistor and the reference voltage end.

6. The relay detection circuit according to claim 1, characterized in that, The driving component includes a coil, and the control module includes: The driver chip is used to output drive signals; A first switch, wherein the control terminal of the first switch is electrically connected to the driver chip, the first terminal of the first switch is electrically connected to the second terminal of the coil, and the second terminal of the first switch is electrically connected to the reference voltage terminal, and the first terminal of the coil is electrically connected to the second power supply; The relay detection circuit is configured as follows: During the pre-charge phase after the positive DC bus is powered on, the driver chip outputs a first drive signal, and the first switch opens in response to the first drive signal, thereby de-energizing the coil and opening the relay switch; or... During the pre-charge completion phase after the positive DC bus is powered on, the drive chip outputs a second drive signal, and the first switch turns on in response to the second drive signal, so that the coil is energized and the relay switch is turned on.

7. The relay detection circuit according to claim 2, characterized in that, The pre-charge module includes at least one pre-charge resistor, which is connected in series between the positive DC bus and the DC output terminal.

8. A relay detection method, characterized in that, The method, applied to the relay detection circuit of any one of claims 1-7, comprises: During the pre-charging phase after the positive DC bus is powered on, when the drive component of the control module drives the relay to open the switch of the relay, the relay status detection signal output by the status detection module is acquired. If the relay status detection signal indicates that the relay is switched on, then the fault is determined to be in the positive DC bus, the precharge module, or the status detection module; or... During the pre-charge completion stage after the positive DC bus is powered on, when the control module drives the drive component to control the relay switch to turn on, the relay status detection signal output by the status detection module is acquired. If the relay status detection signal indicates that the relay is switched off, then the relay is determined to be faulty.

9. A high-voltage circuit system, characterized in that, include: A DC bus, a relay, and a relay detection circuit as described in any one of claims 1-7; The relay is located between the positive DC bus and the first end of the load, and the second end of the load is electrically connected to the negative DC bus.

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