High-voltage interlocking detection circuit and high-voltage interlocking system

Abstract

The utility model relates to the technical field of power electronics, and discloses a high-voltage interlocking detection circuit and a high-voltage interlocking system. The circuit comprises at least two high-voltage interlocking detection interfaces, a control module and a detection module, the detection module comprises at least two detection units, the parameters of the detection units are different, and the parameters of any number of detection units after mutual combination are also different; each detection unit is connected in parallel with a high-voltage interlocking detection interface, and the high-voltage interlocking detection interface is connected with a high-voltage connector and controls whether the corresponding detection unit is short-circuited or not under the action of the high-voltage connector; the control module is arranged between the input end and the output end of the detection module and collects detection signals output by the detection units which are not short-circuited in the detection module. Therefore, the problem that an existing interlocking detection scheme cannot realize positioning detection of a high-voltage connector which is abnormally connected is solved.

Description

Technical Field

[0001] This application relates to the field of power electronics technology, and in particular to a high-voltage interlock detection circuit and a high-voltage interlock system. Background Technology

[0002] With the continuous development of automotive technology, especially in the detection of whether the high-voltage load connectors in the controller of new energy vehicles are properly connected, the main method is to set up a low-voltage detection harness. The current low-voltage detection harness is set up by connecting a detection circuit in series or parallel with the high-voltage connector. However, the existing detection circuit can only detect whether the high-voltage connector is not properly connected, and it cannot determine the specific location of the high-voltage connector that is not properly connected. Utility Model Content

[0003] In view of this, this application proposes a high-voltage interlock detection circuit and a high-voltage interlock system to solve the problem that existing interlock detection schemes cannot locate and detect high-voltage connectors with abnormal connections.

[0004] The first aspect of this application provides a high-voltage interlock detection circuit comprising: at least two high-voltage interlock detection interfaces, a control module, and a detection module; wherein, the detection module comprises at least two detection units, the parameters of each detection unit are different, and the parameters of any combination of the detection units are also different; each detection unit is connected in parallel with one of the high-voltage interlock detection interfaces, the high-voltage interlock detection interfaces are connected to a high-voltage connector, and the high-voltage connector controls whether the corresponding detection unit is short-circuited; the control module is located between the input and output terminals of the detection module, and collects the detection signals output by the detection units in the detection module that are not short-circuited.

[0005] In one feasible implementation, when the detection unit is an RC circuit composed of resistors and capacitors, each of the RC circuits is connected in series; the control module is connected in parallel with the circuit formed by the series connection of each of the RC circuits.

[0006] In one feasible implementation, the RC circuit is an Nth-order RC filter circuit, where N is greater than or equal to 1.

[0007] In one feasible implementation, the detection module includes: a second resistor and a power supply; one end of the second resistor is connected to the output terminal of the control module, and the other end of the second resistor is connected to the power supply; the control module acquires voltage signals across at least two voltage divider circuits after different high-voltage interlock detection interfaces are shorted.

[0008] In one feasible implementation, the detection units are connected in series, and the input terminal of the first detection unit of the at least two connected detection units is connected to the common terminal of the second resistor and the control module; when at least one of the at least two high-voltage interlock detection interfaces is short-circuited, the magnitude of the voltage signal at both ends of the at least two detection units is equal to the sum of the voltages of all detection units that are not short-circuited.

[0009] In one feasible implementation, the detection units are connected in parallel; each voltage divider circuit includes at least two resistors connected in series, at least one of which is connected in parallel with the high-voltage interlock detection interface; one end of the at least two detection units connected in parallel is connected to the common terminal of the second resistor and the control module; when at least one of the at least two high-voltage interlock detection interfaces is short-circuited, the magnitude of the voltage signal across the at least two detection units is equal to the voltage after all the detection units are short-circuited and all the detection units are connected in parallel without short-circuiting.

[0010] In one feasible implementation, the parameters of each detection unit are different, and the parameters of any combination of the detection units are also different, wherein the resistance values ​​of each detection unit satisfy an odd number relationship, and the resistance values ​​of any combination of the detection units are also different.

[0011] In one feasible implementation, the control module includes: a pulse generation circuit connected to the input terminal of the detection module, for providing a number of pulse waves equal to the number of high-voltage interlock detection interfaces, wherein the frequencies of each pulse wave are different; and a pulse detection circuit connected to the output terminal of the detection module, for receiving pulse waves transmitted by each of the un-short-circuited detection units.

[0012] A second aspect of this application provides a high-voltage interlock system, including at least two high-voltage connectors and a high-voltage interlock detection circuit as described above. Each high-voltage connector is connected to a detection unit via a high-voltage interlock detection interface. When a high-voltage load is connected to a high-voltage connector, the corresponding detection unit is short-circuited by the high-voltage interlock detection interface, thereby changing the detection signal output by the detection module.

[0013] In one feasible implementation, the high-voltage connector is provided with an interface that matches the high-voltage interlock detection interface. When the high-voltage connector is connected to a high-voltage load, the interface connects the two ends of the corresponding high-voltage interlock detection interface to short-circuit the corresponding detection unit.

[0014] The technical solution provided in this application includes a high-voltage interlock detection circuit with a detection module containing multiple detection units. The parameters of each detection unit within this module are different, and the parameters resulting from any combination of detection units are also different. Using such a high-voltage interlock detection circuit to detect the connection status of a high-voltage connector not only allows for the detection of abnormal connection status but also enables the precise location of any abnormal high-voltage connector based on the different parameter settings. Attached Figure Description

[0015] Figure 1 This is a first schematic diagram of a high-voltage interlock detection circuit provided in an embodiment of this application;

[0016] Figure 2 This is a second schematic diagram of the high-voltage interlock detection circuit provided in the embodiments of this application;

[0017] Figure 3 This is a third schematic diagram of the high-voltage interlock detection circuit provided in the embodiments of this application;

[0018] Figure 4 for Figure 3 The circuit diagram of the high-voltage interlock detection circuit provided;

[0019] Figure 5 This is a fourth schematic diagram of the high-voltage interlock detection circuit provided in the embodiments of this application;

[0020] Figure 6 for Figure 5 The circuit diagram of the high-voltage interlock detection circuit provided;

[0021] Figure 7 This is a fifth schematic diagram of the high-voltage interlock detection circuit provided in the embodiments of this application;

[0022] Figure 8 for Figure 7 The circuit diagram of the high-voltage interlock detection circuit provided;

[0023] Figure 9 This is a sixth schematic diagram of a high-voltage interlock detection circuit provided in an embodiment of this application;

[0024] Figure 10 This is a schematic diagram of a high-voltage interlocking system provided in an embodiment of this application. Detailed Implementation

[0025] This application provides a high-voltage interlock detection circuit and a high-voltage interlock system. By setting up a detection module comprising multiple detection units and a high-voltage interlock detection interface connected in parallel with the detection units, the parameters of each detection unit or the combination of multiple detection units are different. This enables the location of the connection status of high-voltage connectors and the location of high-voltage connectors with abnormal connections. A low-cost detection module can identify which loads (high-voltage connectors) are connected in the high-voltage interlock circuit. When a high-voltage connector detachment fault occurs, the system automatically locates the faulty high-voltage connector, achieving automatic monitoring of high-voltage connector detachment faults.

[0026] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a particular order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of the application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover a 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.

[0027] like Figure 1 As shown in the embodiment of this application, a high-voltage interlock detection circuit is provided. The circuit includes at least two high-voltage interlock detection interfaces 110, a control module 120, and a detection module 130. Each high-voltage interlock detection interface 110 is connected in parallel to the detection module 130, and the control module 120 is connected to the output and input terminals of the detection module 130.

[0028] It should be noted that the detection module 130 includes at least two detection units 131, each of which corresponds to a high-voltage interlock detection interface 110 connected in parallel. This high-voltage interlock detection interface 110 is used to connect to a high-voltage connector, i.e., to a high-voltage load. The high-voltage interlock detection interface 110 is in an open state when the high-voltage connector is disconnected; conversely, it is in a conductive state when the high-voltage connector is connected. When the high-voltage interlock detection interface 110 is in an open state, the corresponding detection unit 131 is not short-circuited, and the control module 120 can receive the detection signal corresponding to that detection unit 131. When the high-voltage interlock detection interface 110 is in a conductive state, the corresponding detection unit 131 is short-circuited, and the control module 120 cannot receive the detection signal corresponding to the short-circuited detection unit 131.

[0029] In this embodiment, the detection module 130 includes at least two detection units 131, each with different parameters, and the parameters of any combination of detection units 131 are also different. Each detection unit 131 is connected in parallel with a high-voltage interlock detection interface 110, which is connected to a high-voltage connector and controls whether the corresponding detection unit 131 is short-circuited under the action of the high-voltage connector. The control module 120 is located between the input and output terminals of the detection module 130 and collects the detection signals output by the unshort-circuited detection units 131 in the detection module 130.

[0030] It is understandable that the multiple detection units 131 in the detection module 130 can be connected in series or in parallel, such as... Figure 2 The diagram shows a series connection method, wherein at least two detection units 131 are connected in series to form a high-voltage interlock detection branch. One end of the high-voltage interlock detection branch is connected to the output terminal of the control module 120 (which may be a signal output port), and the other end is connected to the input terminal of the control module 120 (which is actually a detection port).

[0031] Optionally, the detection unit 131 can be a voltage divider circuit consisting of at least one resistor, or it can be an RC circuit. If it is an RC circuit, an N-order RC filter circuit should be selected. The detection of whether the corresponding high-voltage connector is abnormally connected can be achieved by using RC filter circuits with different parameters to pass through PWM waveforms of different frequencies.

[0032] It should be noted that if the detection unit 131 is an RC circuit, the detection units 131 are connected in series, and the control module is connected in parallel with the circuit formed by the series connection of the RC circuits. For example... Figure 3 As shown, the output terminal of the control module 120 is connected to the resistor of the first RC circuit in the detection module 130, and the input terminal of the control module 120 is connected to the resistor of the last RC circuit in the detection module 130.

[0033] The RC circuit is an N-order RC filter circuit, where N is greater than or equal to 1. It specifically includes resistors and capacitors, which are connected in series. The various RC circuits are connected in series via resistors, such as... Figure 4As shown in the diagram, a first-order RC filter circuit is used as an example. R1 and C1 constitute the first detection unit 131. R2 and C2, R3 and C3, R4 and C4, and R5 and C5 each correspond to a detection unit 131. Resistors R1, R2, R3, R4, and R5 are connected in series. R1 is connected to the output terminal of the control module 120, and R5 is connected to the input terminal of the control module 120. C1, C2, C3, C4, and C5 are all grounded. Each of R1-R5 is connected in parallel to a high-voltage interlock detection interface 110. Under this detection module 130 structure, the control module 120 continuously outputs PWM waves of different frequencies. Simultaneously, the control module 120 receives PWM waves from the detection module 130 and analyzes their frequencies to determine which high-voltage connectors are connected correctly and which are not. When one of the high-voltage connectors malfunctions and disconnects, the high-voltage interlock detection interface 110 corresponding to that high-voltage connector is disconnected. The resistance in the series circuit changes, which in turn changes the conduction frequency of the RC filter circuit for the PWM wave. The control module 120 outputs PWM waves of different frequencies to the detection module 130. By sampling the waveform signal output by the detection module 130, it can be determined whether the high-voltage connector has detached and where the detached connector is located.

[0034] Taking a 5-channel high-voltage load as an example, the resistance values ​​of R1, R2, R3, R4, and R5 in the detection module 130 satisfy an odd number relationship, namely R5 = 21R1, R4 = 11R1, R3 = 5R1, and R2 = 3R1.

[0035] Thus, when a high-voltage connector malfunctions, the resistance values ​​in the detection circuits will differ under various operating conditions. The possible operating conditions for the detection module 130 are as follows:

[0036] 1. The 5-channel connector is properly plugged in.

[0037] 2. One of the 5 connectors is disconnected.

[0038] Two of the 3- and 5-channel connectors are disconnected.

[0039] Three of the four or five connectors are disconnected.

[0040] 5. Four out of the five connectors are disconnected.

[0041] 6. Five out of the five connectors are disconnected.

[0042] There are a total of 32 working conditions with 6 possible disengagement combinations: 1 + 5 + 10 + 10 + 5 + 1.

[0043] When all 5 connectors are properly connected, the resistance in the detection circuit is 0R; when only the first connector is disconnected, the resistance in the detection circuit is 1R; when only the second connector is disconnected, the resistance in the detection circuit is 3R; and so on. The resistance values ​​in the detection circuit for all 32 operating conditions are shown in Table 1 below.

[0044] Table 1 shows the high-voltage connector connection status for each detection unit in the detection circuit.

[0045]

[0046]

[0047] The numbers in the table above represent resistance values. "+" indicates the high-voltage connector is disconnected, and "-" indicates it is connected. When different high-voltage connectors are connected differently, the resistance values ​​in the detection module 130 will vary. Based on the RC low-pass filter principle, the cutoff frequency of the circuit... With a fixed capacitance value C in the circuit, different R values ​​result in different frequencies of PWM waveforms that the detection circuit can pass through. Thus, by inputting PWM waves of different frequencies from the input terminal and performing detection at the output terminal, the connection status of each high-voltage connector can be identified.

[0048] When using an RC circuit as the detection unit 131, the control module 120 should be configured to transmit pulse waves of different frequencies, such as... Figure 9 As shown, the control module 120 includes:

[0049] The pulse generation circuit 121, connected to the input terminal of the detection module 130, is used to provide the same number of pulse waves as the number of high-voltage interlock detection interfaces 110, wherein the frequencies of each pulse wave are different.

[0050] The pulse detection circuit 122, which is connected to the output terminal of the detection module 130, is used to receive the pulse waves transmitted by each of the un-short-circuited detection units 131.

[0051] In practical applications, the pulse generation circuit 121 determines the frequency of the pulse wave based on the parameters of each detection unit 131, and then sets a timer to generate pulse waves of the corresponding frequency and poll them to the detection module 130, thereby realizing the detection of interlocking abnormalities.

[0052] This high-voltage interlock detection circuit, constructed using RC circuits in series, incorporates resistors and capacitors of varying values. By controlling the circuit and generating different PWM waveforms, it detects the connection status of each high-voltage connector, automatically identifying their insertion and removal states. Compared to existing parallel interlock detection circuits, this circuit requires fewer I / O ports to detect the connection status of each high-voltage load, and its simpler hardware reduces hardware costs.

[0053] In one feasible implementation, such as Figure 5 As shown, the detection unit 131 can also be configured with voltage divider circuits. In this case, the detection module 130 further includes: a second resistor 132 and a power supply 133; one end of the second resistor 132 is connected to the output terminal of the control module 120, and the other end of the second resistor 132 is connected to the power supply 133; the control module 120 acquires the voltage signals at both ends of the at least two voltage divider circuits after the different high-voltage interlock detection interfaces 110 are shorted.

[0054] It should be noted that the detection units 131 can be connected in series or in parallel. When the detection units 131 are connected in series, the input terminal of the first detection unit among the at least two detection units 131 connected in series is connected to the common terminal of the second resistor 132 and the control module 120; when at least one of the at least two high-voltage interlock detection interfaces 110 is short-circuited, the magnitude of the voltage signal across the at least two detection units 131 is equal to the sum of the voltages of all detection units 131 that are not short-circuited.

[0055] like Figure 6 As shown, the voltage divider circuit uses a single resistor instead of a resistor. All resistors form a voltage divider loop for detecting the connection status of the high-voltage connector, and each resistor is connected in parallel to a high-voltage interlock detection interface 110. The resistance values ​​of R1-R5 in the figure should also satisfy an odd number relationship, and the resistance values ​​of any number of resistors combined with each other will be different. The total resistance value of different combinations is similar to that in Table 1 above. At this time, the control module 120 is actually a voltage detection circuit. When different high-voltage interlock detection interfaces 110 are short-circuited, the total resistance value of R1-R5 changes. After the power supply VCC is divided by resistor R0, the voltage across R1-R5 will also change. Based on the different voltage values ​​measured, it can be determined which high-voltage connector has an abnormal connection.

[0056] In another embodiment, the voltage divider circuits can also be connected in parallel, such as... Figure 7 and 8As shown, each voltage divider circuit includes at least two resistors connected in series, at least one of which is connected in parallel with the high-voltage interlock detection interface 110; one end of the at least two detection units 131 connected in parallel is connected to the common terminal of the second resistor 132 and the control module 120; when at least one of the at least two high-voltage interlock detection interfaces 110 is short-circuited, the magnitude of the voltage signal across the at least two detection units 131 is equal to the voltage after all detection units 131 are short-circuited and the voltage after all detection units 131 are connected in parallel without short-circuiting. It should be noted that the resistance values ​​of each voltage divider circuit are different, and the resistance values ​​after the parallel combination of each voltage divider circuit are also different.

[0057] Through the implementation of this embodiment, the high-voltage interlock detection circuit is equipped with a detection module containing multiple detection units. Furthermore, the parameters of each detection unit in this module are different, and the parameters resulting from any combination of any number of detection units are also different. Using such a high-voltage interlock detection circuit to detect the connection status of a high-voltage connector not only allows for the detection of abnormal connection status but also enables the precise location of any abnormal high-voltage connector based on the different parameter settings.

[0058] This application also provides a high-voltage interlock system, including at least two high-voltage connectors 1010 and a high-voltage interlock detection circuit 1020 as provided in the above embodiments. Each of the high-voltage connectors 1010 is connected to a detection unit 131 through a high-voltage interlock detection interface 110. When a high-voltage load is connected to the high-voltage connector 1010, the corresponding detection unit 131 is short-circuited by the high-voltage interlock detection interface 110, so that the detection signal output by the detection module 130 changes.

[0059] In one feasible implementation, the high-voltage connector 1010 is provided with an interface that matches the high-voltage interlock detection interface 110. When the high-voltage connector 1010 is connected to a high-voltage load, the interface connects the two ends of the corresponding high-voltage interlock detection interface 110 to short-circuit the corresponding detection unit 131.

[0060] Since this high-voltage interlock system includes the high-voltage interlock detection circuit provided in the above embodiments, this system can also solve the technical problems of the high-voltage interlock detection circuit and achieve the corresponding effective results.

[0061] Finally, it should be noted that the above embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The protection scope of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the technical scope disclosed in this application. Such modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be covered within the protection scope of this application. Therefore, the protection scope of this application should be determined by the protection scope of the claims.

Claims

1. A high-voltage interlock detection circuit, characterized in that, include: The system includes at least two high-voltage interlock detection interfaces, a control module, and a detection module; wherein the detection module includes at least two detection units, the parameters of each detection unit are different, and the parameters of any combination of the detection units are also different. Each of the detection units is connected in parallel with one of the high-voltage interlock detection interfaces. The high-voltage interlock detection interface is connected to a high-voltage connector and controls whether the corresponding detection unit is short-circuited under the action of the high-voltage connector. The control module is located between the input and output terminals of the detection module and collects the detection signals output by the detection units in the detection module that are not short-circuited.

2. The high-voltage interlock detection circuit according to claim 1, characterized in that, When the detection unit is an RC circuit composed of a first resistor and a capacitor, each of the RC circuits is connected in series; the control module is connected in parallel with the circuit formed by the series connection of each of the RC circuits.

3. The high-voltage interlock detection circuit according to claim 2, characterized in that, The RC circuit is an N-order RC filter circuit, where N is greater than or equal to 1.

4. The high-voltage interlock detection circuit according to claim 1, characterized in that, The detection unit is a voltage divider circuit, and the detection module further includes: a second resistor and a power supply; One end of the second resistor is connected to the output terminal of the control module, and the other end of the second resistor is connected to the power supply. The control module acquires voltage signals from both ends of at least two voltage divider circuits after different high-voltage interlock detection interfaces are shorted.

5. The high-voltage interlock detection circuit according to claim 4, characterized in that, The detection units are connected in series, and the input terminal of the first detection unit in the series connection is connected to the common terminal of the second resistor and the control module. If at least one of the at least two high-voltage interlock detection interfaces is short-circuited, the magnitude of the voltage signal across the at least two detection units is equal to the sum of the voltages of all detection units that are not short-circuited.

6. The high-voltage interlock detection circuit according to claim 4, characterized in that, The detection units are connected in parallel; each voltage divider circuit includes at least two resistors connected in series, at least one of which is connected in parallel with the high-voltage interlock detection interface; one end of the at least two detection units connected in parallel is connected to the common terminal of the second resistor and the control module; If at least one of the at least two high-voltage interlock detection interfaces is short-circuited, the magnitude of the voltage signal across the at least two detection units is equal to the voltage after all the detection units are short-circuited and all the detection units are connected in parallel.

7. The high-voltage interlock detection circuit according to any one of claims 1-6, characterized in that, The parameters of each detection unit are different, and the parameters of any combination of the detection units are also different. The resistance values ​​of each detection unit satisfy an odd number relationship, and the resistance values ​​of any combination of the detection units are also different.

8. The high-voltage interlock detection circuit according to claim 2 or 3, characterized in that, The control module includes: A pulse generation circuit connected to the input terminal of the detection module is used to provide a number of pulse waves equal to the number of high-voltage interlock detection interfaces, wherein the frequencies of each pulse wave are different. A pulse detection circuit connected to the output terminal of the detection module is used to receive pulse waves transmitted by each of the detection units that are not short-circuited.

9. A high-voltage interlocking system, characterized in that, It includes at least two high-voltage connectors and a high-voltage interlock detection circuit as described in any one of claims 1-8, wherein each of the high-voltage connectors is connected to a detection unit through a high-voltage interlock detection interface; When a high-voltage load is connected to the high-voltage connector, the corresponding detection unit is short-circuited by the high-voltage interlock detection interface, thereby changing the detection signal output by the detection module.

10. The high-voltage interlocking system according to claim 9, characterized in that, The high-voltage connector is provided with an interface that matches the high-voltage interlock detection interface. When the high-voltage connector is connected to a high-voltage load, the interface connects the two ends of the corresponding high-voltage interlock detection interface to short-circuit the corresponding detection unit.

Images