Relay state detection circuit and relay state detection device

Abstract

The embodiment of the utility model provides a relay state detection circuit and a relay state detection device, belongs to the field of capacitor discharge, and particularly relates to a relay state detection circuit and a relay state detection device, the circuit comprises a relay and a relay diagnosis module; the relay diagnosis module comprises a relay diagnosis power supply, a signal acquisition unit, a fourth diode, a fifth diode, a first voltage division unit, a second voltage division unit and a third voltage division unit; current flows out of the positive electrode of the relay diagnosis power supply, flows through the first voltage dividing unit and then flows to the fourth positive electrode tube, the second voltage dividing unit and the third voltage dividing unit. The current of the fourth positive electrode tube flows to the signal acquisition unit; the current of the second voltage dividing unit flows through a fifth positive electrode tube and then flows into the negative electrode of the relay diagnosis power supply. The current of the third voltage dividing unit flows through the relay and then flows into the cathode of the relay diagnosis power supply. The embodiment of the utility model can provide the bias voltage partial voltage acquisition circuit which is not influenced by the discharge of the external power supply.

Description

Technical Field

[0001] This utility model relates to the field of capacitor discharge, and in particular to a relay status detection circuit and a relay status detection device. Background Technology

[0002] Currently, relay diagnostics rely on differential voltage acquisition of the relay's external terminals and bias voltage dividers. The differential voltage acquisition method for identifying negative-terminal relays is more complex than the bias voltage divider method, and while the bias voltage divider method is more cost-effective, it is susceptible to external power supply discharge, requiring complex strategies to mitigate interference. Therefore, designing a bias voltage divider circuit unaffected by external power supply discharge is a pressing issue. Utility Model Content

[0003] The main objective of this application is to provide a relay state detection circuit and a relay state detection device, which aims to provide a bias voltage divider acquisition circuit that is not affected by external power supply discharge.

[0004] To achieve the above objectives, a first aspect of this application provides a relay state detection circuit, the circuit comprising:

[0005] Relay;

[0006] A relay diagnostic module, connected to the relay, is used to detect the open and closed state of the relay;

[0007] The relay diagnostic module includes a relay diagnostic power supply, a signal acquisition unit, a current limiting unit, a first voltage divider unit, a second voltage divider unit, and a third voltage divider unit;

[0008] The current limiting unit includes a fourth diode and a fifth diode;

[0009] The positive terminal of the relay diagnostic power supply is electrically connected to one end of the first voltage divider unit;

[0010] The other end of the first voltage divider unit is electrically connected to the negative terminal of the fourth diode, one end of the second voltage divider unit, and one end of the third voltage divider unit;

[0011] The positive terminal of the fourth diode is electrically connected to the signal acquisition unit;

[0012] The other end of the second voltage divider unit is electrically connected to the negative terminal of the fifth diode;

[0013] The positive terminal of the fifth diode is electrically connected to the negative terminal of the signal acquisition unit and the relay diagnostic power supply;

[0014] The other end of the third voltage divider unit is electrically connected to one end of the relay;

[0015] The other end of the relay is electrically connected to the signal acquisition unit and the negative terminal of the relay diagnostic power supply.

[0016] In some embodiments, the second voltage divider unit includes a second resistor, and the third voltage divider unit includes a first diode and a third resistor;

[0017] The negative terminal of the first diode is electrically connected to one end of the first resistor, the positive terminal of the first diode is electrically connected to one end of the third resistor, and the other end of the third resistor is electrically connected to one end of the relay.

[0018] In some embodiments, the circuit further includes a positive terminal insulation sampling module, a main positive relay, a positive terminal insulation voltage regulator module, a negative terminal insulation sampling module, a negative terminal insulation voltage regulator module, and an insulation sampling power supply;

[0019] The positive terminal of the insulation sampling power supply is electrically connected to one end of the positive insulation sampling module and one end of the main positive relay;

[0020] The other end of the positive end insulation sampling module and one end of the negative end insulation sampling module;

[0021] The other end of the negative-end insulation sampling module is electrically connected to the negative terminal of the insulation sampling power supply;

[0022] The other end of the main positive relay is electrically connected to one end of the positive terminal insulated voltage regulator module;

[0023] The other end of the positive-terminal insulated voltage regulator module is electrically connected to one end of the negative-terminal insulated voltage regulator module, and the other end of the positive-terminal insulated voltage regulator module is grounded;

[0024] The other end of the negative-terminal insulated voltage regulator module is electrically connected to one end of the relay;

[0025] The other end of the relay is electrically connected to the negative terminal of the insulated sampling power supply.

[0026] In some embodiments, the positive terminal insulation sampling module includes a positive terminal insulation sampling bridge arm, a positive terminal insulation sampling capacitor, and a positive terminal insulation sampling resistor;

[0027] One end of the positive-terminal insulated sampling bridge arm, one end of the positive-terminal insulated sampling capacitor, and one end of the positive-terminal insulated sampling resistor are respectively electrically connected to the positive terminal of the insulated sampling power supply;

[0028] The other end of the positive-end insulated sampling bridge arm, the other end of the positive-end insulated sampling capacitor, and the other end of the positive-end insulated sampling resistor are respectively electrically connected to one end of the negative-end insulated sampling module.

[0029] In some embodiments, the positive-terminal insulation sampling bridge arm includes a positive-terminal insulation sampling relay and a positive-terminal insulation sampling voltage divider resistor;

[0030] One end of the positive terminal insulation sampling voltage divider resistor is electrically connected to the positive terminal of the insulation sampling power supply, and the other end of the positive terminal insulation sampling voltage divider resistor is electrically connected to one end of the positive terminal insulation sampling relay;

[0031] The other end of the positive-terminal insulation sampling relay is electrically connected to one end of the negative-terminal insulation sampling module.

[0032] In some embodiments, the negative-terminal insulation sampling module includes a negative-terminal insulation sampling bridge arm, a negative-terminal insulation sampling capacitor, and a negative-terminal insulation sampling resistor;

[0033] One end of the negative-end insulated sampling bridge arm, one end of the negative-end insulated sampling capacitor, and one end of the negative-end insulated sampling resistor are respectively electrically connected to one end of the positive-end insulated sampling module;

[0034] The other end of the negative-terminal insulated sampling bridge arm, the other end of the negative-terminal insulated sampling capacitor, and the other end of the negative-terminal insulated sampling resistor are respectively electrically connected to the negative terminal of the insulated sampling power supply.

[0035] In some embodiments, the negative-terminal insulation sampling bridge arm includes a negative-terminal insulation sampling relay and a negative-terminal insulation sampling voltage divider resistor;

[0036] One end of the negative-terminal insulation sampling relay is electrically connected to one end of the positive-terminal insulation sampling module, and the other end of the negative-terminal insulation sampling relay is electrically connected to one end of the negative-terminal insulation sampling voltage divider resistor;

[0037] The other end of the negative-terminal insulated sampling voltage divider resistor is electrically connected to the negative terminal of the insulated sampling power supply.

[0038] In some embodiments, the positive-terminal insulated voltage regulator module includes a positive-terminal insulated voltage regulator capacitor and a positive-terminal insulated voltage regulator resistor;

[0039] One end of the positive-terminal insulated voltage-stabilizing capacitor and one end of the positive-terminal insulated voltage-stabilizing resistor are respectively electrically connected to the main positive relay;

[0040] The other end of the positive-terminal insulated voltage regulator capacitor and the other end of the positive-terminal insulated voltage regulator resistor are respectively electrically connected to one end of the negative-terminal insulated voltage regulator module.

[0041] In some embodiments, the negative-terminal insulated voltage regulator module includes a negative-terminal insulated voltage regulator capacitor and a negative-terminal insulated voltage regulator resistor;

[0042] One end of the negative-terminal insulated voltage regulator capacitor and one end of the negative-terminal insulated voltage regulator resistor are respectively electrically connected to one end of the positive-terminal insulated voltage regulator module;

[0043] The other end of the negative-terminal insulated voltage-stabilizing capacitor and the other end of the negative-terminal insulated voltage-stabilizing resistor are respectively electrically connected to one end of the relay.

[0044] To achieve the above objectives, a second aspect of the present application provides a relay state detection device, including a relay state detection circuit as described in any of the first aspects.

[0045] In the relay state detection circuit and device illustrated in this application embodiment, current flows from the positive terminal of the relay diagnostic power supply, through the first voltage divider unit, and then to the fourth diode, the second voltage divider unit, and the third voltage divider unit, respectively. The current after passing through the second voltage divider unit flows to the fifth diode, and then to the negative terminal of the relay diagnostic power supply. The current flowing through the third voltage divider unit passes through the relay and then to the negative terminal of the relay diagnostic power supply. When the relay is open, the third voltage divider unit forms an open circuit; when the relay is closed, it forms a closed circuit. This causes a change in the current flowing through the fourth diode, and the current from the fourth diode flows into the signal acquisition unit. The current flowing into the signal acquisition unit when the relay is closed is different from the current flowing into the signal acquisition unit when the relay is open, thus determining the open / closed state of the relay through different current signals. On the other hand, when the external power supply discharges, the fourth and fifth diodes ensure the direction of current flow, preventing deviation between the current flowing into the signal acquisition unit and the preset current judgment value, thereby ensuring that the open / closed state of the relay is not affected by external current interference. Attached Figure Description

[0046] Figure 1 This is a circuit schematic diagram of the relay status detection circuit provided in the embodiments of this application;

[0047] Figure 2 This is a circuit schematic diagram of a relay state detection circuit provided in another embodiment of this application;

[0048] Figure 3 This is a block diagram of the relay status detection device provided in the embodiments of this application. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0050] It should be noted that although functional modules are divided in the device schematic diagram and a logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than the module division in the device or the order in the flowchart. The terms "first," "second," etc., in the specification, claims, and the aforementioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit this application.

[0052] The relay state detection circuit and relay state detection device provided in this application are specifically described through the following embodiments. First, the relay state detection circuit in this application embodiment is described.

[0053] The relay status detection circuit provided in this application can be applied to a terminal, a server, or software running on either a terminal or a server. In some embodiments, the terminal can be a smartphone, tablet, laptop, desktop computer, etc.; the server can be configured as an independent physical server, a server cluster or distributed system composed of multiple physical servers, or a cloud server providing basic cloud computing services such as cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communication, middleware services, domain name services, security services, CDN, and big data and artificial intelligence platforms; the software can be an application that implements the relay status detection circuit, but is not limited to the above forms.

[0054] This application can be used in a wide variety of general-purpose or special-purpose computer system environments or configurations. Examples include: personal computers, server computers, handheld or portable devices, tablet devices, multiprocessor systems, microprocessor-based systems, set-top boxes, programmable consumer electronics, network PCs, minicomputers, mainframe computers, and distributed computing environments including any of the above systems or devices. This application can be described in the general context of computer-executable instructions executed by a computer, such as program modules. Generally, program modules include routines, programs, objects, components, data structures, etc., that perform specific tasks or implement specific abstract data types. This application can also be practiced in distributed computing environments where tasks are performed by remote processing devices connected via a communication network. In distributed computing environments, program modules can reside in local and remote computer storage media, including storage devices.

[0055] Please see Figure 1In some embodiments, the relay status detection circuit includes a relay;

[0056] The relay diagnostic module connects to the relay and is used to detect the relay's open and closed state.

[0057] The relay diagnostic module includes a relay diagnostic power supply, an ADC signal acquisition unit, a current limiting unit, a first voltage divider unit, a second voltage divider unit, and a third voltage divider unit;

[0058] The current limiting unit includes a fourth diode D4 and a fifth diode D5;

[0059] The positive terminal of the relay diagnostic power supply is electrically connected to one end of the first voltage divider unit;

[0060] The other end of the first voltage divider unit is electrically connected to the negative terminal of the fourth diode D4, one end of the second voltage divider unit, and one end of the third voltage divider unit;

[0061] The positive terminal of the fourth diode D4 is electrically connected to the signal acquisition unit ADC;

[0062] The other end of the second voltage divider unit is electrically connected to the negative terminal of the fifth diode D5;

[0063] The positive terminal of the fifth diode D5 is electrically connected to the negative terminal of the signal acquisition unit ADC and the relay diagnostic power supply;

[0064] The other end of the third voltage divider unit is electrically connected to one end of the relay;

[0065] The other end of the relay is electrically connected to the signal acquisition unit ADC and the negative terminal of the relay diagnostic power supply.

[0066] The beneficial effects of this application's embodiments include, but are not limited to: the current flowing out of the positive terminal of the relay diagnostic power supply flows through the first voltage divider unit, and then flows to the fourth diode D4, the second voltage divider unit, and the third voltage divider unit, respectively. The current flowing through the second voltage divider unit flows to the fifth diode D5, and then to the negative terminal of the relay diagnostic power supply. The current flowing through the third voltage divider unit flows through the relay, and then to the negative terminal of the relay diagnostic power supply. In the relay open state, the third voltage divider unit forms an open circuit; in the relay closed state, the third voltage divider unit forms a closed circuit, thereby causing a change in the current flowing through the fourth diode D4. The current in the fourth diode D4 flows into the signal acquisition unit. The current flowing into the signal acquisition unit when the relay is closed is inconsistent with the current flowing into the signal acquisition unit when the relay is open, thereby determining the open / closed state of the relay through different current signals. On the other hand, when the external power supply discharges, the fourth diode D4 and the fifth diode D5 ensure the direction of current flow, avoiding deviation between the current flowing into the ADC of the signal acquisition unit and the preset current judgment value, thereby ensuring that the open / closed state of the relay is not affected by external current.

[0067] Please see Figure 1 In some embodiments, the first voltage divider unit includes a first resistor R1, the second voltage divider unit includes a second resistor R2, and the third voltage divider unit includes a first diode D1 and a third resistor R3;

[0068] The negative terminal of the first diode D1 is electrically connected to one end of the first resistor R1, and the positive terminal of the first diode D1 is electrically connected to one end of the third resistor R3. The other end of the third resistor R3 is electrically connected to one end of the relay.

[0069] The advantage of this embodiment is that by setting a first resistor R1, a second resistor R2, a third resistor R3, and a first diode D1 in the circuit, the safety of the circuit is ensured, so that the voltage of the power supply can be distributed to the resistors in the circuit. On the other hand, through the relationship between the voltage divider unit and the current of the power supply, the signal acquisition unit ADC can acquire a value equal to the preset current judgment value when the relay is open or closed, thereby realizing the judgment of the open and closed state of the relay.

[0070] Please see Figure 1 and Figure 2 In some embodiments, the circuit further includes a positive terminal insulation sampling module, a main positive relay, a positive terminal insulation voltage regulator module, a negative terminal insulation sampling module, a negative terminal insulation voltage regulator module, and an insulation sampling power supply;

[0071] The positive terminal of the insulation sampling power supply is electrically connected to one end of the positive insulation sampling module and one end of the main positive relay;

[0072] The other end of the positive-terminal insulation sampling module and one end of the negative-terminal insulation sampling module;

[0073] The other end of the negative-terminal insulation sampling module is electrically connected to the negative terminal of the insulation sampling power supply;

[0074] The other end of the main positive relay is electrically connected to one end of the positive terminal insulated voltage regulator module;

[0075] The other end of the positive-terminal insulated voltage regulator module is electrically connected to one end of the negative-terminal insulated voltage regulator module, and the other end of the positive-terminal insulated voltage regulator module is grounded;

[0076] The other end of the negative-terminal insulated voltage regulator module is electrically connected to one end of the relay.

[0077] The other end of the relay is electrically connected to the negative terminal of the insulated sampling power supply.

[0078] The advantage of this embodiment lies in that by setting up positive and negative insulation sampling modules connected to the positive and negative terminals of the high-voltage power supply insulation sampling power supply, the insulation status of the insulation sampling power supply can be evaluated, thereby assessing whether there are leakage or insulation deterioration issues. Furthermore, positive and negative insulation voltage regulator modules are included to stabilize voltage and suppress voltage spikes, thus protecting sensitive electronic components. A main positive relay is also provided; when the insulation sampling power supply needs to power an external circuit, the main positive relay can control the power supply status of the insulation sampling power supply, further improving circuit safety. For example, if the insulation sampling power supply is for a battery pack in a new energy vehicle, the positive and negative insulation sampling modules can be used to evaluate whether the battery pack has leakage or insulation deterioration, and the positive and negative insulation voltage regulator modules can stabilize the precision electronic components in the new energy vehicle. The main positive relay can also control the power supply status of the battery pack.

[0079] Please see Figure 1 and Figure 2 In some embodiments, the positive terminal insulation sampling module includes a positive terminal insulation sampling bridge arm, a positive terminal insulation sampling capacitor Yp, and a positive terminal insulation sampling resistor Rp;

[0080] One end of the positive-terminal insulated sampling bridge arm, one end of the positive-terminal insulated sampling capacitor Yp, and one end of the positive-terminal insulated sampling resistor Rp are respectively electrically connected to the positive terminal of the insulated sampling power supply;

[0081] The other end of the positive-end insulated sampling bridge arm, the other end of the positive-end insulated sampling capacitor Yp, and the other end of the positive-end insulated sampling resistor Rp are respectively electrically connected to one end of the negative-end insulated sampling module.

[0082] The advantage of this embodiment is that by setting the positive terminal insulation sampling bridge arm and the positive terminal insulation sampling resistor Rp in parallel, the resistance value of the positive terminal insulation sampling bridge arm and the positive terminal insulation sampling resistor Rp in parallel can be controlled by the positive terminal insulation bridge arm. Then, by comparing the voltage that can be obtained by the positive terminal insulation sampling bridge arm and the positive terminal insulation sampling resistor Rp in parallel with the preset judgment value, it can be determined whether there is leakage or insulation deterioration in the insulation sampling power supply. On the other hand, the positive terminal insulation sampling capacitor Yp filters and stabilizes the voltage in the circuit, thereby stabilizing the voltage and suppressing voltage spikes.

[0083] Please see Figure 1 and Figure 2 In some embodiments, the positive-terminal insulated sampling bridge arm includes a positive-terminal insulated sampling relay HVp MOS and a positive-terminal insulated sampling voltage divider resistor Rpx;

[0084] One end of the positive terminal insulation sampling voltage divider resistor Rpx is electrically connected to the positive terminal of the insulation sampling power supply, and the other end of the positive terminal insulation sampling voltage divider resistor Rpx is electrically connected to one end of the positive terminal insulation sampling relay HVp MOS;

[0085] The other end of the positive-terminal insulated sampling relay HVp MOS is electrically connected to one end of the negative-terminal insulated sampling module.

[0086] The advantage of this embodiment is that by controlling the on / off state of the positive insulation sampling relay HVp MOS, the resistance value of the positive insulation sampling bridge arm and the positive insulation sampling resistor Rp in parallel is controlled. Thus, by comparing the voltage that can be obtained by the positive insulation sampling bridge arm and the positive insulation sampling resistor Rp in parallel with the preset judgment value, it can be determined whether there is leakage or insulation deterioration in the insulation sampling power supply.

[0087] Please see Figure 1 and Figure 2 In some embodiments, the negative terminal insulation sampling module includes a negative terminal insulation sampling bridge arm, a negative terminal insulation sampling capacitor Yn, and a negative terminal insulation sampling resistor Rn;

[0088] One end of the negative-terminal insulated sampling bridge arm, one end of the negative-terminal insulated sampling capacitor Yn, and one end of the negative-terminal insulated sampling resistor Rn are respectively electrically connected to one end of the positive-terminal insulated sampling module;

[0089] The other end of the negative-terminal insulated sampling bridge arm, the other end of the negative-terminal insulated sampling capacitor Yn, and the other end of the negative-terminal insulated sampling resistor Rn are respectively electrically connected to the negative terminal of the insulated sampling power supply.

[0090] The advantage of this embodiment is that by setting the negative-terminal insulation sampling bridge arm and the negative-terminal insulation sampling resistor Rn in parallel, the resistance value of the negative-terminal insulation sampling bridge arm and the negative-terminal insulation sampling resistor Rn in parallel can be controlled by the negative-terminal insulation sampling bridge arm. Then, by comparing the voltage that can be obtained by the negative-terminal insulation sampling bridge arm and the negative-terminal insulation sampling resistor Rn in parallel with the preset judgment value, it can be determined whether there is leakage or insulation deterioration in the insulation sampling power supply. On the other hand, the negative-terminal insulation sampling capacitor Yn filters and stabilizes the voltage in the circuit, thereby stabilizing the voltage and suppressing voltage spikes.

[0091] Please see Figure 1 and Figure 2 In some embodiments, the negative-terminal insulated sampling bridge arm includes a negative-terminal insulated sampling relay HVn MOS and a negative-terminal insulated sampling voltage divider resistor Rnx;

[0092] One end of the negative-terminal insulated sampling relay HVn MOS is electrically connected to one end of the positive-terminal insulated sampling module, and the other end of the negative-terminal insulated sampling relay HVn MOS is electrically connected to one end of the negative-terminal insulated sampling voltage divider resistor Rnx;

[0093] The other end of the negative-terminal insulated sampling voltage divider resistor Rnx is electrically connected to the negative terminal of the insulated sampling power supply.

[0094] The advantage of this embodiment is that by controlling the opening and closing state of the negative insulation sampling relay HVn MOS, the resistance value of the negative insulation sampling bridge arm and the negative insulation sampling resistor Rn in parallel is controlled. Then, by comparing the voltage that can be obtained by the negative insulation sampling bridge arm and the negative insulation sampling resistor Rn in parallel with the preset judgment value, it can be determined whether there is leakage or insulation deterioration in the insulation sampling power supply.

[0095] Please see Figure 1 and Figure 2 In some embodiments, the positive-terminal insulated voltage regulator module includes a positive-terminal insulated voltage regulator capacitor Yp1 and a positive-terminal insulated voltage regulator resistor Rp1;

[0096] One end of the positive-terminal insulated voltage-stabilizing capacitor Yp1 and one end of the positive-terminal insulated voltage-stabilizing resistor Rp1 are respectively electrically connected to the main positive relay;

[0097] The other end of the positive-terminal insulated voltage regulator capacitor Yp1 and the other end of the positive-terminal insulated voltage regulator resistor Rp1 are respectively electrically connected to one end of the negative-terminal insulated voltage regulator module.

[0098] The advantage of this embodiment is that by setting the positive-terminal insulating voltage regulator capacitor Yp1, the entire circuit is filtered and stored. When the discharge of the insulating sampling power supply is unstable, it can absorb the high voltage of the insulating sampling power supply. Furthermore, when the discharge of the insulating sampling power supply is intermittent, the positive-terminal insulating voltage regulator capacitor Yp1 can provide power, thus stabilizing the voltage. In addition, the positive-terminal insulating voltage regulator capacitor Yp1 and the insulating voltage regulator resistor are grounded, and the negative-terminal insulating voltage regulator module is connected, further improving the circuit's safety.

[0099] Please see Figure 1 and Figure 2 In some embodiments, the negative-terminal insulated voltage regulator module includes a negative-terminal insulated voltage regulator capacitor Yn1 and a negative-terminal insulated voltage regulator resistor Rn1;

[0100] One end of the negative-terminal insulated voltage regulator capacitor Yn1 and one end of the negative-terminal insulated voltage regulator resistor Rn1 are respectively electrically connected to one end of the positive-terminal insulated voltage regulator module;

[0101] The other end of the negative-terminal insulated voltage regulator capacitor Yn1 and the other end of the negative-terminal insulated voltage regulator resistor Rn1 are respectively electrically connected to one end of the relay.

[0102] The advantage of this embodiment is that the current from the positive-terminal insulated voltage regulator module is stabilized by the negative-terminal insulated voltage regulator capacitor Yn1 and the negative-terminal insulated voltage regulator resistor Rn1, while also serving as an energy storage function.

[0103] Additionally, it should be noted that when the insulating voltage regulator capacitor discharges, the current flowing through the relay will reach the positive terminals of the fifth diode D5 and the fourth diode D4. At this time, due to the current limiting effect of the fifth diode D5 and the fourth diode D4, the current cannot form a path. Therefore, the fifth diode D5 and the fourth diode D4 protect the relay's diagnostics from interference from the discharge of the negative terminal insulating voltage regulator capacitor Yn1.

[0104] It should be noted that the current flowing to the fifth diode D5 and the fourth diode D4 caused by the discharge of any capacitor in any relay diagnostic circuit of this application will be limited, so that the judgment of the open and closed state of the relay is not affected by external current.

[0105] Please see Figure 3 This application also provides a relay status detection device, including a relay status detection circuit.

[0106] The specific implementation of this relay status detection device is basically the same as the specific embodiment of the relay status detection circuit described above, and will not be repeated here.

[0107] The relay state detection circuit and device provided in this application embodiment utilize a relay diagnostic power supply. Current flows from the positive terminal of the power supply through a first voltage divider unit, then to the fourth diode D4, the second voltage divider unit, and the third voltage divider unit. The current flowing through the second voltage divider unit flows to the fifth diode D5, and then to the negative terminal of the relay diagnostic power supply. The current flowing through the third voltage divider unit passes through the relay and then to the negative terminal of the relay diagnostic power supply. When the relay is open, the third voltage divider unit forms an open circuit; when the relay is closed, it forms a closed circuit. This causes a change in the current flowing through the fourth diode D4. The current flowing through the fourth diode D4 flows into the signal acquisition unit. The current flowing into the signal acquisition unit when the relay is closed is different from the current flowing into the signal acquisition unit when the relay is open, thus determining the relay's open / closed state through these different current signals. Furthermore, when the external power supply discharges, the fourth diode D4 and the fifth diode D5 ensure the direction of current flow, preventing deviations between the current flowing into the signal acquisition unit's ADC and the preset current judgment value, thereby ensuring that the relay's open / closed state is not affected by external current interference.

[0108] The embodiments described in this application are for the purpose of more clearly illustrating the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions provided by the embodiments of this application. As those skilled in the art will know, with the evolution of technology and the emergence of new application scenarios, the technical solutions provided by the embodiments of this application are also applicable to similar technical problems.

[0109] Those skilled in the art will understand that the technical solutions shown in the figures do not constitute a limitation on the embodiments of this application, and may include more or fewer steps than shown, or combine certain steps, or different steps.

[0110] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0111] Those skilled in the art will understand that all or some of the steps in the methods disclosed above, as well as the functional modules / units in the systems and devices, can be implemented as software, firmware, hardware, or suitable combinations thereof.

[0112] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0113] It should be understood that in this application, "at least one (item)" means one or more, and "more than" means two or more. "And / or" is used to describe the relationship between related objects, indicating that three relationships can exist. For example, "A and / or B" can represent three cases: only A exists, only B exists, and both A and B exist simultaneously, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one (item) of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one (item) of a, b, or c can represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.

[0114] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of the units described above is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. The coupling or direct coupling or communication connection between the shown or discussed units may be through some interfaces, or indirect coupling or communication connection between the apparatus or units, and may be electrical, mechanical, or other forms.

[0115] The units described above as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0116] The preferred embodiments of the present application have been described above with reference to the accompanying drawings, but this does not limit the scope of the claims of the present application. Any modifications, equivalent substitutions, and improvements made by those skilled in the art without departing from the scope and substance of the embodiments of the present application shall be within the scope of the claims of the present application.

Claims

1. A relay state detection circuit, characterized in that, The circuit includes: Relay; A relay diagnostic module, connected to the relay, is used to detect the open and closed state of the relay; The relay diagnostic module includes a relay diagnostic power supply, a signal acquisition unit, a current limiting unit, a first voltage divider unit, a second voltage divider unit, and a third voltage divider unit; The current limiting unit includes a fourth diode and a fifth diode; The positive terminal of the relay diagnostic power supply is electrically connected to one end of the first voltage divider unit; The other end of the first voltage divider unit is electrically connected to the negative terminal of the fourth diode, one end of the second voltage divider unit, and one end of the third voltage divider unit; The positive terminal of the fourth diode is electrically connected to the signal acquisition unit; The other end of the second voltage divider unit is electrically connected to the negative terminal of the fifth diode; The positive terminal of the fifth diode is electrically connected to the negative terminal of the signal acquisition unit and the relay diagnostic power supply; The other end of the third voltage divider unit is electrically connected to one end of the relay; The other end of the relay is electrically connected to the signal acquisition unit and the negative terminal of the relay diagnostic power supply.

2. The circuit according to claim 1, characterized in that, The first voltage divider unit includes a first resistor, the second voltage divider unit includes a second resistor, and the third voltage divider unit includes a first diode and a third resistor; The negative terminal of the first diode is electrically connected to one end of the first resistor, the positive terminal of the first diode is electrically connected to one end of the third resistor, and the other end of the third resistor is electrically connected to one end of the relay.

3. The circuit according to claim 1, characterized in that, The circuit also includes a positive terminal insulation sampling module, a main positive relay, a positive terminal insulation voltage regulator module, a negative terminal insulation sampling module, a negative terminal insulation voltage regulator module, and an insulation sampling power supply; The positive terminal of the insulation sampling power supply is electrically connected to one end of the positive insulation sampling module and one end of the main positive relay; The other end of the positive end insulation sampling module and one end of the negative end insulation sampling module; The other end of the negative-end insulation sampling module is electrically connected to the negative terminal of the insulation sampling power supply; The other end of the main positive relay is electrically connected to one end of the positive terminal insulated voltage regulator module; The other end of the positive-terminal insulated voltage regulator module is electrically connected to one end of the negative-terminal insulated voltage regulator module, and the other end of the positive-terminal insulated voltage regulator module is grounded; The other end of the negative-terminal insulated voltage regulator module is electrically connected to one end of the relay; The other end of the relay is electrically connected to the negative terminal of the insulated sampling power supply.

4. The circuit according to claim 3, characterized in that, The positive terminal insulation sampling module includes a positive terminal insulation sampling bridge arm, a positive terminal insulation sampling capacitor, and a positive terminal insulation sampling resistor; One end of the positive-terminal insulated sampling bridge arm, one end of the positive-terminal insulated sampling capacitor, and one end of the positive-terminal insulated sampling resistor are respectively electrically connected to the positive terminal of the insulated sampling power supply; The other end of the positive-end insulated sampling bridge arm, the other end of the positive-end insulated sampling capacitor, and the other end of the positive-end insulated sampling resistor are respectively electrically connected to one end of the negative-end insulated sampling module.

5. The circuit according to claim 4, characterized in that, The positive-end insulation sampling bridge arm includes a positive-end insulation sampling relay and a positive-end insulation sampling voltage divider resistor; One end of the positive terminal insulation sampling voltage divider resistor is electrically connected to the positive terminal of the insulation sampling power supply, and the other end of the positive terminal insulation sampling voltage divider resistor is electrically connected to one end of the positive terminal insulation sampling relay; The other end of the positive-terminal insulation sampling relay is electrically connected to one end of the negative-terminal insulation sampling module.

6. The circuit according to claim 3, characterized in that, The negative-end insulation sampling module includes a negative-end insulation sampling bridge arm, a negative-end insulation sampling capacitor, and a negative-end insulation sampling resistor. One end of the negative-end insulated sampling bridge arm, one end of the negative-end insulated sampling capacitor, and one end of the negative-end insulated sampling resistor are respectively electrically connected to one end of the positive-end insulated sampling module; The other end of the negative-terminal insulated sampling bridge arm, the other end of the negative-terminal insulated sampling capacitor, and the other end of the negative-terminal insulated sampling resistor are respectively electrically connected to the negative terminal of the insulated sampling power supply.

7. The circuit according to claim 6, characterized in that, The negative-end insulation sampling bridge arm includes a negative-end insulation sampling relay and a negative-end insulation sampling voltage divider resistor; One end of the negative-terminal insulation sampling relay is electrically connected to one end of the positive-terminal insulation sampling module, and the other end of the negative-terminal insulation sampling relay is electrically connected to one end of the negative-terminal insulation sampling voltage divider resistor; The other end of the negative-terminal insulated sampling voltage divider resistor is electrically connected to the negative terminal of the insulated sampling power supply.

8. The circuit according to claim 3, characterized in that, The positive-terminal insulated voltage regulator module includes a positive-terminal insulated voltage regulator capacitor and a positive-terminal insulated voltage regulator resistor; One end of the positive-terminal insulated voltage-stabilizing capacitor and one end of the positive-terminal insulated voltage-stabilizing resistor are respectively electrically connected to the main positive relay; The other end of the positive-terminal insulated voltage regulator capacitor and the other end of the positive-terminal insulated voltage regulator resistor are respectively electrically connected to one end of the negative-terminal insulated voltage regulator module.

9. The circuit according to claim 3, characterized in that, The negative-terminal insulated voltage regulator module includes a negative-terminal insulated voltage regulator capacitor and a negative-terminal insulated voltage regulator resistor. One end of the negative-terminal insulated voltage regulator capacitor and one end of the negative-terminal insulated voltage regulator resistor are respectively electrically connected to one end of the positive-terminal insulated voltage regulator module; The other end of the negative-terminal insulated voltage-stabilizing capacitor and the other end of the negative-terminal insulated voltage-stabilizing resistor are respectively electrically connected to one end of the relay.

10. A relay detection device, characterized in that, Includes a relay status detection circuit as described in any one of claims 1 to 9.

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