Detection circuit and vehicle

Abstract

The utility model discloses a kind of detection circuit and vehicle comprising the detection circuit of this detection circuit.The detection circuit is used to detect the central electrical appliance box with input end and comprising: connecting end;Power supply, at power supply voltage;First resistance, one end is electrically connected to the power supply, its other end is electrically connected to the connecting end;Second resistance, one end is electrically connected to the other end of the first resistance, its other end is grounded and at ground voltage;And detection end, electrically connected to the one end of the second resistance and output detection voltage;The detection circuit is configured as: when the connecting end is electrically connected to input end at the power supply voltage, output first detection voltage, when the connecting end is disconnected with the input end and vacant, output second detection voltage, when the connecting end is electrically connected to input end at the ground voltage, output third detection voltage, and satisfy: U1>U2>U3=0V, U1 is first detection voltage, U2 is second detection voltage, U3 is third detection voltage.

Description

Technical Field

[0001] This utility model relates to a detection circuit and a vehicle including the detection circuit. Background Technology

[0002] As vehicles become increasingly intelligent, automakers require them to have fault indication functions. This allows maintenance personnel to quickly identify and repair problems when fuses or relays malfunction, enabling timely detection of damage to the central electrical box (CEB). The CEB is the core control and power distribution hub of the vehicle's electrical system, essentially the car's "electrical brain" and "power distribution station." It integrates various electrical components, managing and distributing electrical energy and protecting circuit safety, making it a crucial component for the efficient and reliable operation of modern automotive electrical systems. In this context, status detection circuits become particularly important. However, existing status detection circuits typically fall into two categories: one that can only detect the high-level and idle states of fuses, and another that can only detect the low-level and idle states of relays. Without knowing whether the faulty CEB contains a fuse or a relay, it's necessary to try both types of status detection circuits sequentially, increasing time and workload. When the same central electrical box is on the same platform and operates in different modes, it will have different functions. For example, the relay is at a low level in the first mode and at a high level in the second mode. This means that two state detection circuits must be installed in the vehicle at the same time to detect the state of the relay properly, which makes the vehicle's circuit structure more complicated.

[0003] Therefore, there is an urgent need to provide a detection circuit with a simple structure that can detect three different states, so as to realize the universality of state detection of the central electrical box and reduce the cost of state detection. Utility Model Content

[0004] The embodiments of this utility model are intended to solve at least one aspect of the above problems.

[0005] According to one aspect of the present invention, a detection circuit is provided for detecting a central electrical box having an input terminal, comprising: a connection terminal; a power supply at a power supply voltage; a first resistor, one end of which is electrically connected to the power supply, and the other end of which is electrically connected to the connection terminal; a second resistor, one end of which is electrically connected to the other end of the first resistor, and the other end of which is grounded and at a ground voltage; and a detection terminal electrically connected to the first end of the second resistor and outputting a detection voltage; the detection circuit is configured to: output a first detection voltage when the connection terminal is electrically connected to the input terminal at the power supply voltage, output a second detection voltage when the connection terminal is disconnected from the input terminal and is idle, and output a third detection voltage when the connection terminal is electrically connected to the input terminal at the ground voltage, and satisfying: U1 > U2 > U3 = 0V, where U1 is the first detection voltage, U2 is the second detection voltage, and U3 is the third detection voltage.

[0006] According to one aspect of the present invention, one end of the second resistor is directly electrically connected to the other end of the first resistor.

[0007] According to one aspect of the present invention, the detection end is directly electrically connected to one end of the second resistor.

[0008] According to one aspect of this utility model , ,in, It is the power supply voltage. It is the first resistor. It is the second resistor.

[0009] According to one aspect of the present invention, the detection terminal is indirectly electrically connected to one end of the second resistor.

[0010] According to one aspect of the present invention, the detection circuit further includes a third resistor electrically connected between the detection terminal and one end of the second resistor.

[0011] According to one aspect of this utility model , , ,in, It is the power supply voltage. It is the voltage across the third resistor. It is the first resistor. It is the second resistor. It is the third resistor.

[0012] According to one aspect of the present invention, the detection circuit further includes: a first capacitor, one end of which is electrically connected to the detection terminal and the other end of which is grounded.

[0013] According to one aspect of the present invention, the detection circuit further includes a second capacitor connected in parallel with the second resistor.

[0014] According to one aspect of the present invention, the detection circuit further includes a fourth resistor connected in parallel with the second resistor.

[0015] According to one aspect of the present invention, one end of the second resistor is indirectly connected to the other end of the first resistor.

[0016] According to one aspect of the present invention, the detection circuit further includes a fifth resistor electrically connected between one end of the second resistor and the other end of the first resistor.

[0017] According to one aspect of this utility model , ,in, It is the power supply voltage. It is the first resistor. It is the second resistor. It is the fifth resistor.

[0018] According to one aspect of the present invention, the detection circuit further includes: a first capacitor, one end of which is electrically connected to the detection terminal and the other end of which is grounded; and a second capacitor, one end of which is electrically connected to the connection terminal and the other end of which is grounded.

[0019] According to one aspect of the present invention, the detection circuit further includes a third resistor electrically connected between the detection terminal and one end of the second resistor.

[0020] According to one aspect of this utility model , , ,in, It is the power supply voltage. It is the first resistor. It is the second resistor. It is the fifth resistor. It is the voltage across the third resistor.

[0021] According to one aspect of the present invention, the detection circuit further includes a fourth resistor connected in parallel with the second resistor.

[0022] According to one aspect of the present invention, the central electrical box is provided with at least one of a fuse and a relay.

[0023] According to another aspect of the present invention, a vehicle is provided, including a detection circuit according to any of the foregoing aspects. Attached Figure Description

[0024] The features of this utility model will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, wherein similar reference numerals always identify corresponding elements. In the drawings, similar reference numerals generally denote identical, functionally similar, and / or structurally similar elements. Unless otherwise stated, the drawings provided throughout this document should not be construed as being drawn to scale.

[0025] Figure 1 This is a schematic diagram of the detection circuit according to the first embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram of the detection circuit according to the second embodiment of the present invention;

[0027] Figure 3 This is a schematic diagram of the detection circuit according to the third embodiment of the present invention;

[0028] Figure 4 This is a schematic diagram of the detection circuit according to the fourth embodiment of the present invention;

[0029] Figure 5 This is a schematic diagram of the detection circuit according to the fifth embodiment of the present invention; and

[0030] Figure 6 This is a schematic diagram of the detection circuit according to the sixth embodiment of the present invention.

[0031] The accompanying drawings, which are incorporated herein and form a part of this specification, illustrate the present invention and, together with the description, further serve to explain the principles of the present invention and enable those skilled in the art to make and use the embodiments described herein. Detailed Implementation

[0032] The technical solution of this utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings. In this specification, the same or similar reference numerals indicate the same or similar components. The following description of the embodiments of this utility model with reference to the accompanying drawings is intended to explain the overall inventive concept of this utility model and should not be construed as a limitation thereof.

[0033] Furthermore, in the following detailed description, numerous specific details are set forth for ease of explanation to provide a thorough understanding of the embodiments disclosed herein. However, it will be apparent that one or more embodiments may be practiced without these specific details. In other instances, well-known structures and apparatuses are illustrated to simplify the figures.

[0034] See Figures 1 to 6 This utility model discloses a detection circuit 1000, 2000, 3000, 4000, 5000, 6000 for detecting a central electrical box 7000 having an input terminal 7100 and an output terminal 7200, and a vehicle (not shown in the figure) including the detection circuit 1000, 2000, 3000, 4000, 5000, 6000.

[0035] The central electrical box 7000 is equipped with at least one of a fuse and a relay. For ease of description, in Figures 1 to 6 The central electrical box 7000 is shown only schematically in a block diagram.

[0036] The detection circuits 1000, 2000, 3000, 4000, 5000, and 6000 according to six embodiments of the present invention will be described in detail below.

[0037] Figure 1 A detection circuit 1000 according to a first embodiment of the present invention is shown. The detection circuit 1000 includes: a connection terminal 1001, a power supply 1010, a first resistor 100, a second resistor 200, a second capacitor 700, and a detection terminal 1002.

[0038] Power supply 1010 is at the power supply voltage and supplies power to detection circuit 1000 to drive detection circuit 1000 to work. The power supply voltage can also be referred to as the "high level" or "drive voltage". One end of the first resistor 100 (i.e., the end of the first resistor 100 at...) Figure 1 The upper end of the first resistor 100 is electrically connected to the power supply 1010, and the other end 110 of the first resistor 100 (i.e., the upper end of the first resistor 100) is electrically connected to the power supply 1010. Figure 1 The lower end of the second resistor 200 is electrically connected to the connection terminal 1001. One end 210 of the second resistor 200 (i.e., the lower end of the second resistor 200) is electrically connected to the connection terminal 1001. Figure 1 The upper end of the second resistor 200 is directly electrically connected to the other end 110 of the first resistor 100 (i.e., the upper end of the second resistor 200). Figure 1The lower end of the first resistor 200 is grounded and at a ground voltage (0V, also known as a "low level"), as is known to those skilled in the art. The detection terminal 1002 is directly electrically connected to one end 210 of the second resistor 200. Since this end 210 of the second resistor 200 is at the same potential as the other end 110 of the first resistor 100, the detection terminal 1002 is also directly electrically connected to the other end 110 of the first resistor 100. The detection terminal 1002 outputs a detection voltage to the vehicle's controller or other signal receiving device (not shown). In the detection circuit 1000, the detection voltage is the voltage detected at the detection terminal 1002, which is also the voltage at the other end 110 of the first resistor 100 or the other end 210 of the second resistor 200. The second capacitor 700 is connected in parallel with the second resistor 200. That is, one end of the second capacitor 700 is simultaneously electrically connected to the connection terminal 1001, the other end 110 of the first resistor 100, and the other end 210 of the second resistor 200, and the other end of the second capacitor 700 is grounded. Therefore, the second capacitor 700 is used to filter out excessive noise voltage from the input voltage from the input terminal 7100 and the output voltage (i.e., the aforementioned output detection voltage) from the detection terminal 1002, thereby protecting the detection circuit 1000 and the vehicle controller.

[0039] The detection circuit 1000 is configured to: output a first detection voltage when the connection terminal 1001 is electrically connected to the input terminal 7100 at the power supply voltage; output a second detection voltage when the connection terminal 1001 is disconnected from the input terminal 7100 and is idle (i.e., the connection terminal 1001 is not connected to any circuit or component); and output a third detection voltage when the connection terminal 1001 is electrically connected to the input terminal 7100 at the ground voltage, and satisfy the formula:

[0040] U1>U2>U3=0V (1)

[0041] Among them, U1 is the first detection voltage, U2 is the second detection voltage, and U3 is the third detection voltage, which is always 0V.

[0042] When the detection circuit 1000 outputs U1, it indicates that the input terminal 7100 of the central electrical box 7000 is at the power supply voltage, but it is not necessarily physically connected to the power supply 1010; rather, it is at the same voltage as the power supply voltage of the power supply 1010. This state of the central electrical box 7000 can be referred to as the "first state." When the detection circuit 1000 outputs U2, it indicates that the input terminal 7100 of the central electrical box 7000 is not connected to the detection circuit 1000, and the connection terminal 1001 of the detection circuit 1000 is not connected to any circuit or component. This state of the central electrical box 7000 can be referred to as the "second state." When the detection circuit 1000 outputs U3, it indicates that the input terminal 7100 of the central electrical box 7000 is at the ground voltage of 0V. This state of the central electrical box 7000 can be referred to as the "third state." Therefore, the simple detection circuit 1000 can detect three different states of the central electrical box 7000 by outputting three voltages U1, U2, and U3 with different values ​​corresponding to the first, second, and third states, respectively. This realizes the universality of state detection for the central electrical box 7000, which not only greatly improves the convenience of detection operation but also reduces the cost of state detection accordingly.

[0043] Furthermore, in the detection circuit 1000, the first resistor 100 and the second resistor 200 are directly connected in series. When the input terminal 7100 is at the power supply voltage, the connection terminal 1001 and the other end 110 of the first resistor 100 are also at the power supply voltage. At this time, the two ends of the first resistor 100 are short-circuited because they are both at the power supply voltage, causing the entire power supply voltage to be applied to the second resistor 200. Therefore, when the central electrical box 7000 is in the first state, the first detection voltage of the detection circuit 1000 satisfies the formula:

[0044] (2)

[0045] in, It is the power supply voltage.

[0046] Furthermore, in the detection circuit 1000, when the connection terminal 1001 of the detection circuit 1000 is idle and not connected to the input terminal 7100 of the central electrical box 7000 or any other circuit or component, the first resistor 100 and the second resistor 200, which are directly connected in series, divide the voltage. Therefore, when the central electrical box 7000 is in the second state, the second detection voltage of the detection circuit 1000 satisfies the formula:

[0047] (3)

[0048] in, It is the power supply voltage. The first resistor is 100. It is the second resistor, 200Ω.

[0049] Furthermore, in the detection circuit 1000, when the connection terminal 1001 of the detection circuit 1000 is at ground voltage, both ends 210 and 220 of the second resistor 200 are at ground voltage, causing the second resistor 200 to be short-circuited. Therefore, when the central electrical box 7000 is in the third state, the third detection voltage U3 of the detection circuit 1000 is 0V.

[0050] Figure 2 A detection circuit 2000 according to a second embodiment of the present invention is shown. Detection circuit 2000 is a variant embodiment of detection circuit 1000. For the sake of brevity, the same components and functions as detection circuit 1000 are not described in detail here, as they can be found in the description of detection circuit 1000. Only the differences between detection circuit 2000 and detection circuit 1000 are described in detail here. The difference between detection circuit 2000 and detection circuit 1000 is that detection circuit 2000 further includes a third resistor 300 and a first capacitor 600.

[0051] The third resistor 300 is electrically connected between the detection terminal 1002 and one end 210 of the second resistor 200, such that the detection terminal 1002 is indirectly electrically connected to one end 210 of the second resistor 200 through the third resistor 300. The resistance value of the third resistor 300 is... The specific value of the third resistor 300 can be set according to the actual situation to reduce the detection voltage detected at the detection terminal 1002, so as to avoid damage to the vehicle controller or other signal receiving devices due to excessive detection voltage. However, those skilled in the art should understand that the present invention is not limited thereto, and suitable electronic components or circuits can be set to replace the third resistor 300 according to actual needs.

[0052] In the detection circuit 2000, one end of the first capacitor 600 is electrically connected to the detection terminal 1002, and the other end of the first capacitor 600 is grounded, to filter out excessive noise voltage in the output voltage (i.e., the aforementioned detection voltage) output from the detection terminal 1002, thereby protecting the vehicle's controller or other signal receiving devices. Correspondingly, the second capacitor 700 is only used to filter out excessive noise voltage in the input voltage from the input terminal 7100, thereby protecting the detection circuit 2000.

[0053] Furthermore, in the detection circuit 2000, the first resistor 100 and the second resistor 200 are directly connected in series. Therefore, when the input terminal 7100 is at the power supply voltage, the connection terminal 1001 and the other end 110 of the first resistor 100 are both at the power supply voltage. At this time, the two ends of the first resistor 100 are short-circuited because they are both at the power supply voltage, causing the entire power supply voltage to be applied to the second resistor 200. Since the third resistor 300 is electrically connected between the detection terminal 1002 and one end 210 of the second resistor 200, it will divide the voltage applied to the second resistor 200. Therefore, when the central electrical box 7000 is in the first state, the first detection voltage of the detection circuit 2000 satisfies the formula:

[0054] (4)

[0055] in, It is the power supply voltage. It is the voltage across the third resistor 300.

[0056] Furthermore, in the detection circuit 2000, when the connection terminal 1001 of the detection circuit 2000 is idle and not connected to the input terminal 7100 of the central electrical box 7000 or any other circuit or component, the first resistor 100 and the second resistor 200, which are directly connected in series, divide the voltage. Since the third resistor 300 is electrically connected between the detection terminal 1002 and one end 210 of the second resistor 200, it will divide the voltage applied to the second resistor 200. Therefore, when the central electrical box 7000 is in the second state, the second detection voltage of the detection circuit 2000 satisfies the formula:

[0057] (5)

[0058] in, It is the power supply voltage. It is the voltage across the third resistor 300. The first resistor is 100. It is the second resistor, 200Ω.

[0059] Furthermore, in the detection circuit 2000, when the connection terminal 1001 of the detection circuit 2000 is at ground voltage, both ends 210 and 220 of the second resistor 200 are at ground voltage, causing the second resistor 200 to be short-circuited. Therefore, when the central electrical box 7000 is in the third state, the third detection voltage U3 of the detection circuit 2000 is 0V.

[0060] Figure 3A detection circuit 3000 according to a third embodiment of the present invention is shown. Detection circuit 3000 is a variant embodiment of detection circuits 1000 and 2000. For the sake of brevity, the same components and functions of detection circuit 3000 as detection circuits 1000 and 2000 will not be described in detail here. These same components and functions can be found in the description of detection circuits 1000 and 2000. Only the differences between detection circuit 3000 and detection circuit 2000 are described in detail here. The difference between detection circuit 3000 and detection circuit 2000 is that detection circuit 2000 further includes a fourth resistor 400 connected in parallel with the second resistor 200 for adjusting the voltage division across the second resistor 200.

[0061] Furthermore, in the detection circuit 3000, the second resistor 200 and the fourth resistor 400 are connected in parallel, and then connected in series with the first resistor 100. Therefore, when the input terminal 7100 is at the power supply voltage, the connection terminal 1001 and the other end 110 of the first resistor 100 are both at the power supply voltage. At this time, the two ends of the first resistor 100 are short-circuited because they are both at the power supply voltage, causing the entire power supply voltage to be applied to the parallel second resistor 200 and the fourth resistor 400. Since the third resistor 300 is electrically connected between the detection terminal 1002 and the end 210 of the second resistor 200, it will divide the voltage applied to the second resistor 200. Therefore, when the central electrical box 7000 is in the first state, the first detection voltage of the detection circuit 3000 satisfies the formula:

[0062] (4)

[0063] in, It is the power supply voltage. It is the voltage across the third resistor 300.

[0064] Furthermore, in the detection circuit 3000, when the connection terminal 1001 of the detection circuit 3000 is idle and not connected to the input terminal 7100 of the central electrical box 7000 or any other circuit or component, the parallel second resistor 200 and the fourth resistor 400 are connected in series with the first resistor 100 to divide the voltage. Since the third resistor 300 is electrically connected between the detection terminal 1002 and one end 210 of the second resistor 200, it will divide the voltage applied to the second resistor 200. Therefore, when the central electrical box 7000 is in the second state, the second detection voltage of the detection circuit 3000 satisfies the formula:

[0065] (6)

[0066] in, It is the power supply voltage. It is the voltage across the third resistor 300. The first resistor is 100. The second resistor is 200. It is the fourth resistor, 400Ω.

[0067] Furthermore, in the detection circuit 3000, when the connection terminal 1001 of the detection circuit 3000 is at ground voltage, both ends 210 and 220 of the second resistor 200 are at ground voltage, causing the second resistor 200 to be short-circuited. Therefore, when the central electrical box 7000 is in the third state, the third detection voltage U3 of the detection circuit 3000 is 0V.

[0068] Figure 4 A detection circuit 4000 according to a fourth embodiment of the present invention is shown. Detection circuit 4000 is a variant embodiment of detection circuit 1000. For the sake of brevity, the components and functions identical to those of detection circuit 1000 in detection circuit 4000 will not be described in detail here, as these components and functions can be found in the description of detection circuit 1000. Only the differences between detection circuit 4000 and detection circuit 1000 will be described in detail here. The difference between detection circuit 4000 and detection circuit 1000 is that detection circuit 4000 further includes a fifth resistor 500 and a first capacitor 600, and a second capacitor 700 is connected in parallel with the second resistor 200 and the fifth resistor 500.

[0069] One end of the first capacitor 600 is electrically connected to the detection terminal 1002 and one end 210 of the second resistor 200, and the other end of the first capacitor 600 is grounded. That is, the first capacitor 600 and the second resistor 200 are connected in parallel to filter out excessive noise voltage in the output voltage (i.e., the aforementioned detection voltage) output from the detection terminal 1002, thereby protecting the vehicle's controller or other signal receiving devices. One end of the second capacitor 700 is simultaneously electrically connected to the connection terminal 1001, the other end 110 of the first resistor 100, and one end 210 of the second resistor 200, and the other end of the second capacitor 700 is grounded. Therefore, the second capacitor 700 is only used to filter out excessive noise voltage in the input voltage from the input terminal 7100, thereby protecting the detection circuit 4000.

[0070] The fifth resistor 500 is electrically connected between one end 210 of the second resistor 200 and the other end 110 of the first resistor 100, such that one end 210 of the second resistor 200 is indirectly electrically connected to the other end 110 of the first resistor 100 through the fifth resistor 500.

[0071] Furthermore, in the detection circuit 4000, the first resistor 100, the fifth resistor 500, and the second resistor 200 are connected in series. Therefore, when the input terminal 7100 is at the power supply voltage, the connection terminal 1001 and the other end 110 of the first resistor 100 are also at the power supply voltage. At this time, the two ends of the first resistor 100 are short-circuited because they are both at the power supply voltage, causing the entire power supply voltage to be applied to the fifth resistor 500 and the second resistor 200, where it is divided by the fifth resistor 500 and the second resistor 200. Therefore, when the central electrical box 7000 is in the first state, the first detection voltage of the detection circuit 4000 satisfies the formula:

[0072] (7)

[0073] in, It is the power supply voltage. The second resistor is 200. It is the fifth resistor, 500Ω.

[0074] Furthermore, in the detection circuit 4000, when the connection terminal 1001 of the detection circuit 4000 is idle and not connected to the input terminal 7100 of the central electrical box 7000 or any other circuit or component, the first resistor 100, the fifth resistor 500, and the second resistor 200, which are connected in series, divide the voltage. Therefore, when the central electrical box 7000 is in the second state, the second detection voltage of the detection circuit 4000 satisfies the formula:

[0075] (8)

[0076] in, It is the power supply voltage. The first resistor is 100. The second resistor is 200. It is the fifth resistor, 500Ω.

[0077] Furthermore, in the detection circuit 4000, when the connection terminal 1001 of the detection circuit 4000 is at ground voltage, both ends of the fifth resistor 500 and both ends 210 and 220 of the second resistor 200 are at ground voltage, causing the fifth resistor 500 and the second resistor 200 to be short-circuited. Therefore, when the central electrical box 7000 is in the third state, the third detection voltage U3 of the detection circuit 4000 is 0V.

[0078] Figure 5A detection circuit 5000 according to a fifth embodiment of the present invention is shown. Detection circuit 5000 is a variant embodiment of detection circuit 4000. For the sake of brevity, the same components and functions as detection circuit 4000 are not described in detail here, as they can be found in the description of detection circuit 4000. Only the differences between detection circuit 5000 and detection circuit 4000 are described in detail here. The difference between detection circuit 5000 and detection circuit 4000 is that detection circuit 5000 further includes a third resistor 300.

[0079] The third resistor 300 is electrically connected between the detection terminal 1002 and one end 210 of the second resistor 200, such that the detection terminal 1002 is indirectly electrically connected to one end 210 of the second resistor 200 through the third resistor 300. The resistance value of the third resistor 300 is... The specific value of the third resistor 300 can be set according to the actual situation to reduce the detection voltage detected at the detection terminal 1002, so as to avoid damage to the vehicle controller or other signal receiving devices due to excessive detection voltage. However, those skilled in the art should understand that the present invention is not limited thereto, and suitable electronic components or circuits can be set to replace the third resistor 300 according to actual needs.

[0080] Furthermore, in the detection circuit 5000, the first resistor 100, the fifth resistor 500, and the second resistor 200 are connected in series. Therefore, when the input terminal 7100 is at the power supply voltage, the connection terminal 1001 and the other end 110 of the first resistor 100 are both at the power supply voltage. At this time, the two ends of the first resistor 100 are short-circuited because they are both at the power supply voltage, causing the entire power supply voltage to be applied to the fifth resistor 500 and the second resistor 200, where it is divided by the fifth resistor 500 and the second resistor 200. Since the third resistor 300 is electrically connected between the detection terminal 1002 and one end 210 of the second resistor 200, it will divide the voltage applied to the second resistor 200. Therefore, when the central electrical box 7000 is in the first state, the first detection voltage of the detection circuit 5000 satisfies the formula:

[0081] (9)

[0082] in, It is the power supply voltage. The second resistor is 200. It is the fifth resistor, 500. It is the voltage across the third resistor 300.

[0083] Furthermore, in the detection circuit 5000, when the connection terminal 1001 of the detection circuit 5000 is idle and not connected to the input terminal 7100 of the central electrical box 7000 or any other circuit or component, the first resistor 100, the fifth resistor 500, and the second resistor 200, which are connected in series, divide the voltage. Since the third resistor 300 is electrically connected between the detection terminal 1002 and one end 210 of the second resistor 200, it will divide the voltage applied to the second resistor 200. Therefore, when the central electrical box 7000 is in the second state, the second detection voltage of the detection circuit 5000 satisfies the formula:

[0084] (10)

[0085] in, It is the power supply voltage. The first resistor is 100. The second resistor is 200. It is the fifth resistor, 500. It is the voltage across the third resistor 300.

[0086] Furthermore, in the detection circuit 5000, when the connection terminal 1001 of the detection circuit 5000 is at ground voltage, both ends of the fifth resistor 500 and both ends 210 and 220 of the second resistor 200 are at ground voltage, causing the fifth resistor 500 and the second resistor 200 to be short-circuited. Therefore, when the central electrical box 7000 is in the third state, the third detection voltage U3 of the detection circuit 5000 is 0V.

[0087] Figure 6 A detection circuit 6000 according to a sixth embodiment of the present invention is shown. Detection circuit 6000 is a variant embodiment of detection circuits 4000 and 5000. For the sake of brevity, the same components and functions of detection circuit 6000 as those of detection circuits 4000 and 5000 will not be described in detail here. These same components and functions can be found in the description of detection circuits 4000 and 5000. Only the differences between detection circuit 6000 and detection circuit 5000 are described in detail here. The difference between detection circuit 6000 and detection circuit 5000 is that detection circuit 6000 further includes a fourth resistor 400 connected in parallel with the second resistor 200 for adjusting the voltage division across the second resistor 200.

[0088] Furthermore, in the detection circuit 6000, the second resistor 200 is connected in parallel with the fourth resistor 400, and then in series with the fifth resistor 500 and the first resistor 100. Therefore, when the input terminal 7100 is at the power supply voltage, the connection terminal 1001 and the other end 110 of the first resistor 100 are both at the power supply voltage. At this time, the two ends of the first resistor 100 are short-circuited because they are both at the power supply voltage, causing the entire power supply voltage to be applied to the fifth resistor 500 and the parallel second resistor 200 and fourth resistor 400, thus being divided by the fifth resistor 500 and the parallel second resistor 200 and fourth resistor 400. Since the third resistor 300 is electrically connected between the detection terminal 1002 and the end 210 of the second resistor 200, it will divide the voltage applied to the second resistor 200. Therefore, when the central electrical box 7000 is in the first state, the first detection voltage of the detection circuit 6000 satisfies the formula:

[0089] (11)

[0090] in, It is the power supply voltage. It is the voltage across the third resistor 300. It is the fifth resistor, 500. The second resistor is 200. It is the fourth resistor, 400Ω.

[0091] Furthermore, in the detection circuit 6000, when the connection terminal 1001 of the detection circuit 6000 is idle and not connected to the input terminal 7100 of the central electrical box 7000 or any other circuit or component, the parallel second resistor 200 and fourth resistor 400 are connected in series with the first resistor 100 and fifth resistor 500 to divide the voltage. Since the third resistor 300 is electrically connected between the detection terminal 1002 and one end 210 of the second resistor 200, it will divide the voltage applied to the second resistor 200. Therefore, when the central electrical box 7000 is in the second state, the second detection voltage of the detection circuit 6000 satisfies the formula:

[0092] (12)

[0093] in, It is the power supply voltage. It is the voltage across the third resistor 300. The first resistor is 100. It is the fifth resistor, 500. The second resistor is 200. It is the fourth resistor, 400Ω.

[0094] Furthermore, in the detection circuit 6000, when the connection terminal 1001 of the detection circuit 6000 is at ground voltage, the two ends of the fifth resistor 500 and the two ends 210 and 220 of the second resistor 200 are also at ground voltage, causing the fifth resistor 500, the second resistor 200 and the fourth resistor 400 to be short-circuited. Therefore, when the central electrical box 7000 is in the third state, the third detection voltage U3 of the detection circuit 6000 is 0V.

[0095] Those skilled in the art will understand that the embodiments described above are exemplary and can be improved upon. The structures described in the various embodiments can be freely combined without causing any conflict in structure or principle.

[0096] After a detailed description of the preferred embodiments of the present invention, those skilled in the art will clearly understand that various changes and modifications can be made without departing from the scope and spirit of the appended claims, and that the present invention is not limited to the embodiments described in the specification.

Claims

1. A detection circuit for detecting a central electrical box having an input terminal, characterized in that, include: Connection end; The power supply is operating at the power supply voltage. A first resistor, one end of which is electrically connected to the power source, and the other end of which is electrically connected to the connection terminal; A second resistor, one end of which is electrically connected to the other end of the first resistor, and the other end of which is grounded and at a ground voltage; and The detection terminal is electrically connected to one end of the second resistor and outputs a detection voltage; The detection circuit is configured to: When the connection terminal is electrically connected to the input terminal at the power supply voltage, a first detection voltage is output. When the connection terminal is disconnected from the input terminal and is idle, a second detection voltage is output. When the connection terminal is electrically connected to the input terminal at the ground voltage, a third detection voltage is output, and the following conditions are met: U1 > U2 > U3 = 0V Wherein, U1 is the first detection voltage, U2 is the second detection voltage, and U3 is the third detection voltage.

2. The detection circuit according to claim 1, characterized in that, One end of the second resistor is directly electrically connected to the other end of the first resistor.

3. The detection circuit according to claim 2, characterized in that, The detection terminal is directly electrically connected to one end of the second resistor.

4. The detection circuit according to claim 3, characterized in that, ， ， in, It is the power supply voltage. It is the first resistor. It is the second resistor.

5. The detection circuit according to claim 2, characterized in that, The detection terminal is indirectly connected to one end of the second resistor.

6. The detection circuit according to claim 5, characterized in that, Also includes: The third resistor is electrically connected between the detection terminal and one end of the second resistor.

7. The detection circuit according to claim 6, characterized in that, ， ， ， in, It is the power supply voltage. It is the voltage across the third resistor. It is the first resistor. It is the second resistor. It is the third resistor.

8. The detection circuit according to claim 6, characterized in that, Also includes: A first capacitor, one end of which is electrically connected to the detection terminal and the other end of which is grounded.

9. The detection circuit according to any one of claims 2, 3, 5, 6 to 8, characterized in that, Also includes: The second capacitor is connected in parallel with the second resistor.

10. The detection circuit according to claim 9, characterized in that, Also includes: The fourth resistor is connected in parallel with the second resistor.

11. The detection circuit according to claim 1, characterized in that, One end of the second resistor is indirectly connected to the other end of the first resistor.

12. The detection circuit according to claim 11, characterized in that, Also includes: The fifth resistor is electrically connected between one end of the second resistor and the other end of the first resistor.

13. The detection circuit according to claim 12, characterized in that, ， ， in, It is the power supply voltage. It is the first resistor. It is the second resistor. It is the fifth resistor.

14. The detection circuit according to claim 11 or 12, characterized in that, Also includes: A first capacitor, one end of which is electrically connected to the detection terminal and the other end of which is grounded; and A second capacitor, one end of which is electrically connected to the connection terminal and the other end of which is grounded.

15. The detection circuit according to claim 14, characterized in that, Also includes: The third resistor is electrically connected between the detection terminal and one end of the second resistor.

16. The detection circuit according to claim 15, characterized in that, ， ， ， in, It is the power supply voltage. It is the first resistor. It is the second resistor. It is the fifth resistor. It is the voltage across the third resistor.

17. The detection circuit according to any one of claims 11, 12, and 15, characterized in that, Also includes: The fourth resistor is connected in parallel with the second resistor.

18. The detection circuit according to any one of claims 1 to 8, 10 to 13, 15 and 16, characterized in that, The central electrical box is equipped with at least one of a fuse and a relay.

19. A vehicle, characterized in that, Includes the detection circuit according to any one of claims 1 to 18.

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