A resistance connection state detection circuit and a detection method

Abstract

Embodiments of the present application provide a resistance connection state detection circuit and a detection method. The resistance connection state detection circuit comprises a voltage sampling module, a sampling resistor, a reference resistor, a switch assembly and a detection module; a first end of the sampling resistor is electrically connected to a first end of the switch assembly, a second end of the sampling resistor is electrically connected to a second end of the switch assembly and a first end of the reference resistor, a second end of the reference resistor is electrically connected to a third end of the switch assembly, a fourth end and a fifth end of the switch assembly are respectively electrically connected to a first input end and a second input end of the voltage sampling module, and an output end of the voltage sampling module is electrically connected to the detection module; the voltage sampling module is configured to obtain a digital sampling voltage of the sampling resistor, and the detection module is configured to detect whether a connection state of the sampling resistor is abnormal based on the digital sampling voltage and a digital reference voltage. The resistance connection state detection circuit can detect whether the connection state of the sampling resistor is normal, thereby improving the accuracy of system current.

Description

Technical Field

[0001] This application relates to the field of integrated circuit technology, and in particular to a detection circuit and detection method for resistor connection status. Background Technology

[0002] In integrated circuit applications, it is necessary to know the magnitude of the system current. Typically, a sampling resistor is connected in series in the circuit. The system current flows through the resistor, and the system current can be sampled by detecting the voltage difference across the sampling resistor. However, in practical applications, the sampling resistor is easily short-circuited or open-circuited. In this case, the sampled system current output will be 0 or full value, regardless of the magnitude of the system current.

[0003] Therefore, there is an urgent need to propose a solution to detect whether the connection status of the sampling resistor is normal, so as to determine whether the current system current collected is accurate. Summary of the Invention

[0004] In view of the above problems, embodiments of this application provide a detection circuit and detection method for resistor connection status, which can detect whether the connection status of the sampling resistor is normal, thereby improving the accuracy of system current.

[0005] In a first aspect, embodiments of this application provide a detection circuit for the state of a resistor connection, including: a voltage sampling module, a sampling resistor, a reference resistor, a switching component, and a detection module;

[0006] The first end of the sampling resistor is electrically connected to the first end of the switching assembly, the second end of the sampling resistor is electrically connected to the second end of the switching assembly and the first end of the reference resistor, the second end of the reference resistor is electrically connected to the third end of the switching assembly, the fourth end of the switching assembly is electrically connected to the first input end of the voltage sampling module, the fifth end of the switching assembly is electrically connected to the second input end of the voltage sampling module, and the output end of the voltage sampling module is electrically connected to the detection module.

[0007] The switching assembly is used to turn on the first input terminal of the voltage sampling module and the first terminal of the sampling resistor in the first state, and to turn on the second input terminal of the voltage sampling module and the second terminal of the sampling resistor.

[0008] The voltage sampling module is used to acquire the digital sampling voltage of the sampling resistor in the first state, wherein the digital sampling voltage is used to characterize the voltage difference across the sampling resistor;

[0009] The detection module is used to detect whether the connection status of the sampling resistor is abnormal based on the digital sampling voltage and the digital reference voltage, wherein the digital reference voltage is used to characterize the voltage difference across the reference resistor.

[0010] In some embodiments, the switching assembly is further configured to, in the second state, turn on the first input terminal of the voltage sampling module and the first terminal of the reference resistor, and turn on the second input terminal of the voltage sampling module and the second terminal of the reference resistor;

[0011] The voltage sampling module is also used to acquire the digital reference voltage in the second state.

[0012] In some embodiments, the switching assembly includes a first switch, a second switch, a third switch, and a fourth switch;

[0013] The first terminal of the first switch is electrically connected to the first terminal of the sampling resistor, the first terminals of the second switch and the first terminals of the third switch are both electrically connected to the second terminal of the sampling resistor, the first terminal of the fourth switch is electrically connected to the second terminal of the reference resistor, the second terminals of the first switch and the second terminals of the second switch are both electrically connected to the first input terminal of the voltage sampling module, and the second terminals of the third switch and the second terminals of the fourth switch are both electrically connected to the second input terminal of the voltage sampling module.

[0014] In some embodiments, the voltage sampling module includes an operational amplifier and an analog-to-digital converter;

[0015] The first input terminal of the operational amplifier is electrically connected to the fourth terminal of the switching assembly, the second input terminal of the operational amplifier is electrically connected to the fifth terminal of the switching assembly, the output terminal of the operational amplifier is electrically connected to the input terminal of the analog-to-digital converter, and the output terminal of the analog-to-digital converter is electrically connected to the detection module.

[0016] The operational amplifier is used to acquire the voltage difference across the sampling resistor in the first state and amplify the voltage difference across the sampling resistor to obtain the sampling voltage.

[0017] The analog-to-digital converter is used to convert the sampled voltage into the digital sampled voltage.

[0018] Secondly, embodiments of this application provide a method for detecting the resistor connection state, applicable to any resistor connection state detection circuit provided in the first aspect, the method comprising:

[0019] In the first state, the first input terminal of the voltage sampling module and the first terminal of the sampling resistor are turned on, and the second input terminal of the voltage sampling module and the second terminal of the sampling resistor are turned on.

[0020] In the first state, the digital sampling voltage of the sampling resistor is obtained, wherein the digital sampling voltage is used to characterize the voltage difference across the sampling resistor;

[0021] Based on the digital sampling voltage and the digital reference voltage, the connection status of the sampling resistor is detected to be abnormal, wherein the digital sampling voltage is used to characterize the voltage difference across the sampling resistor.

[0022] In some embodiments, detecting whether the connection state of the sampling resistor is abnormal based on the digital sampling voltage and the digital reference voltage includes:

[0023] If the ratio of the digital sampling voltage to the digital reference voltage is equal to a preset value, it is determined that the connection status of the sampling resistor is normal.

[0024] If the ratio of the digital sampling voltage to the digital reference voltage is not equal to the preset value, the connection status of the sampling resistor is determined to be abnormal.

[0025] In some embodiments, determining that the connection state of the sampling resistor is abnormal includes:

[0026] If the digital sampling voltage is less than the first threshold voltage, it is determined that the sampling resistor is short-circuited;

[0027] If the digital sampling voltage is greater than the second threshold voltage, the sampling resistor is determined to be open; wherein the second threshold voltage is greater than the first threshold voltage.

[0028] In some embodiments, before detecting whether the connection state of the sampling resistor is abnormal based on the digital sampling voltage and the digital reference voltage, the method further includes:

[0029] In the second state, the first input terminal of the voltage sampling module and the first terminal of the reference resistor are turned on, and the second input terminal of the voltage sampling module and the second terminal of the reference resistor are turned on.

[0030] The digital reference voltage is acquired in the second state.

[0031] In some embodiments, before detecting whether the connection state of the sampling resistor is abnormal based on the digital sampling voltage and the digital reference voltage, the method further includes:

[0032] Obtain the digital calibration voltage when the calibration resistor is properly connected;

[0033] The preset value is determined based on the ratio of the digital calibration voltage to the digital reference voltage.

[0034] In some embodiments, the resistance of the calibration resistor is N times the resistance of the sampling resistor;

[0035] Determining the preset value based on the ratio of the digital calibration voltage to the digital reference voltage includes:

[0036] The preset value is determined as N times the ratio of the digital calibration voltage to the digital reference voltage.

[0037] In some embodiments, obtaining the digital sampling voltage of the sampling resistor includes:

[0038] The voltage difference across the sampling resistor is collected, and the voltage difference across the sampling resistor is amplified to obtain the sampling voltage;

[0039] The sampled voltage is converted into the digital sampled voltage.

[0040] In the technical solution of this application embodiment, the resistor connection state detection circuit includes a voltage sampling module, a sampling resistor, a reference resistor, a switching component, and a detection module. The first end of the sampling resistor is electrically connected to the first end of the switching component; the second end of the sampling resistor is electrically connected to the second end of the switching component and the first end of the reference resistor; the second end of the reference resistor is electrically connected to the third end of the switching component; the fourth end of the switching component is electrically connected to the first input end of the voltage sampling module; the fifth end of the switching component is electrically connected to the second input end of the voltage sampling module; and the output end of the voltage sampling module is electrically connected to the detection module. The switching component can conduct the first input end of the voltage sampling module and the first end of the sampling resistor in a first state, and conduct the second input end of the voltage sampling module and the second end of the sampling resistor. The voltage sampling module can acquire the digital sampling voltage of the sampling resistor in the first state, where the digital sampling voltage is used to characterize the voltage difference across the sampling resistor. The detection module can detect whether the connection state of the sampling resistor is abnormal based on the digital sampling voltage and the digital reference voltage, where the digital reference voltage is used to characterize the voltage difference across the reference resistor. Thus, the resistor connection state detection circuit can detect whether the connection state of the sampling resistor is normal, and determine the system current based on whether the connection state of the sampling resistor is normal, thereby improving the accuracy of the system current.

[0041] The above description is merely an overview of the technical solutions of the embodiments of this application. In order to better understand the technical means of the embodiments of this application and to implement them in accordance with the contents of the specification, and to make the above and other objects, features and advantages of the embodiments of this application more obvious and understandable, specific implementation methods of this application are described below. Attached Figure Description

[0042] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0043] Figure 1A schematic diagram of a resistor connection state detection circuit provided in an embodiment of this application;

[0044] Figure 2 A schematic diagram of another resistor connection state detection circuit provided in an embodiment of this application;

[0045] Figure 3 A schematic diagram of the structure of another resistor connection state detection circuit provided in an embodiment of this application;

[0046] Figure 4 A schematic flowchart illustrating a method for detecting the state of a resistor connection provided in an embodiment of this application;

[0047] Figure 5 A flowchart illustrating another method for detecting the resistor connection state provided in an embodiment of this application;

[0048] Figure 6 A flowchart illustrating another method for detecting the resistor connection state provided in an embodiment of this application;

[0049] Figure 7 A flowchart illustrating another method for detecting the resistor connection state provided in an embodiment of this application;

[0050] Figure 8 A flowchart illustrating another method for detecting the resistor connection state provided in an embodiment of this application;

[0051] Figure 9 This is a flowchart illustrating another method for detecting the resistor connection state provided in an embodiment of this application. Detailed Implementation

[0052] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0053] 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 pertains; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims and drawings of this application are intended to cover non-exclusive inclusion.

[0054] The term "embodiment" as used herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of the phrase "embodiment" in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0055] Furthermore, the terms "first," "second," etc., in the specification and claims of this application or in the aforementioned drawings are used to distinguish different objects rather than to describe a specific order, and may explicitly or implicitly include one or more of the features.

[0056] In the description of this application, unless otherwise expressly specified and limited, the terms "connected" and "connected" shall be interpreted broadly. For example, "connected" or "connected" in circuit structure can refer not only to physical connection, but also to electrical connection or signal connection. For example, it can be a direct connection, i.e., a physical connection, or an indirect connection through at least one intermediate element, as long as the circuit is connected. It can also refer to the internal connection of two elements. Signal connection can refer not only to signal connection through circuit, but also to signal connection through a medium, such as radio waves.

[0057] In this article, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists, A and B exist simultaneously, or B exists. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0058] In the description of this application, unless otherwise stated, "multiple" and "at least two" mean two or more (including two), and similarly, "multiple groups" and "at least two groups" mean two or more (including two groups).

[0059] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0060] Figure 1 This is a schematic diagram of the structure of a resistor connection state detection circuit provided in an embodiment of this application, as shown below. Figure 1 As shown, the detection circuit 100 for the resistance connection state includes: a voltage sampling module 110, a sampling resistor Rs, a reference resistor Rp, a switching component 120, and a detection module 130.

[0061] Specifically, the first end of the sampling resistor Rs is electrically connected to the first end of the switch assembly 120, the second end of the sampling resistor Rs is electrically connected to the second end of the switch assembly 120 and the first end of the reference resistor Rp, the second end of the reference resistor Rp is electrically connected to the third end of the switch assembly 120, the fourth end of the switch assembly 120 is electrically connected to the first input end of the voltage sampling module 110, the fifth end of the switch assembly 120 is electrically connected to the second input end of the voltage sampling module 110, and the output end of the voltage sampling module 110 is electrically connected to the detection module 130.

[0062] A switching assembly 120 is configured to, in a first state, turn on the first input terminal of the voltage sampling module 110 and the first terminal of the sampling resistor Rs, and turn on the second input terminal of the voltage sampling module 110 and the second terminal of the sampling resistor Rs. The voltage sampling module 110 is configured to acquire a digital sampling voltage Vcode of the sampling resistor Rs in the first state, wherein the digital sampling voltage Vcode characterizes the voltage difference across the sampling resistor Rs. A detection module 130 is configured to detect whether the connection state of the sampling resistor Rs is abnormal based on the digital sampling voltage Vcode and the digital reference voltage Vcode', wherein the digital reference voltage Vcode' characterizes the voltage difference across the reference resistor Rp.

[0063] For example, in the first state, the first terminal of the switch assembly 120 is connected to the fourth terminal of the switch assembly 120, and the second terminal and the fifth terminal of the switch assembly 120 are connected. Since the first terminal of the switch assembly 120 is electrically connected to the first terminal of the sampling resistor Rs, the fourth terminal of the switch assembly 120 is electrically connected to the first input terminal of the voltage sampling module 110, the second terminal of the switch assembly 120 is electrically connected to the second terminal of the sampling resistor Rs, and the fifth terminal of the switch assembly 120 is electrically connected to the second input terminal of the voltage sampling module 110, therefore, the first terminal of the sampling resistor Rs is connected to the first input terminal of the voltage sampling module 110, and the second terminal of the sampling resistor Rs is connected to the second input terminal of the voltage sampling module 110.

[0064] The digital sampling voltage Vcode is the digital code stream of the voltage difference across the sampling resistor Rs, meaning it characterizes the voltage difference across Rs. In the first state, the system current flows through the sampling resistor Rs, and the voltage sampling module 110 can acquire the digital sampling voltage Vcode. Since the resistance of Rs is known, the system current can be obtained from the digital sampling voltage Vcode. If the digital sampling voltage Vcode is 0, it could mean the system current is 0 or that the sampling resistor Rs is short-circuited. If the digital sampling voltage Vcode is the maximum value that the voltage sampling module 110 can output, it could mean the system current is large or that the sampling resistor Rs is open-circuited. Therefore, the detection module 130 needs to further detect whether the connection status of the sampling resistor Rs is abnormal.

[0065] The digital reference voltage Vcode' is the digital code stream of the voltage difference across the reference resistor Rp. The reference resistor Rp can be a trace resistor on the system's printed circuit board. Therefore, the digital reference voltage Vcode' characterizes the voltage difference across the reference resistor Rp. When the sampling resistor Rs is connected normally, the digital sampling voltage Vcode and the digital reference voltage Vcode' satisfy: Vcode / Vcode' = Rs / Rp, where Rs is the resistance of the sampling resistor and Rp is the resistance of the reference resistor. Thus, the detection module 130 can determine whether the connection state of the sampling resistor Rs is abnormal based on whether the digital sampling voltage Vcode and the digital reference voltage Vcode' satisfy Vcode / Vcode' = Rs / Rp.

[0066] For example, if Vcode / Vcode' = Rs / Rp, it indicates that the connection state of the sampling resistor Rs is normal, and Vcode / Rs is the system current. If Vcode / Vcode' ≠ Rs / Rp, it indicates that the connection state of the sampling resistor Rs is abnormal, and Vcode / Rs is not the system current. The specific type of abnormal connection state of the sampling resistor Rs can be further determined based on the digital sampling voltage Vcode. For example, if Vcode ≈ 0, the sampling resistor Rs is short-circuited; if Vcode ≈ Vmax, where Vmax is the maximum value that the voltage sampling module 110 can output, the sampling resistor Rs is open-circuited.

[0067] In summary, the detection module 130 can detect whether the connection status of the sampling resistor Rs is abnormal based on the digital sampling voltage Vcode and the digital reference voltage Vcode'. When the connection status is normal, it determines that the system current is Vcode / Rs, and when the connection is abnormal, it determines that Vcode / Rs is not the system current, thereby improving the accuracy of the system current.

[0068] In this embodiment, the resistor connection status detection circuit includes a voltage sampling module, a sampling resistor, a reference resistor, a switching component, and a detection module. The first end of the sampling resistor is electrically connected to the first end of the switching component; the second end of the sampling resistor is electrically connected to the second end of the switching component and the first end of the reference resistor; the second end of the reference resistor is electrically connected to the third end of the switching component; the fourth end of the switching component is electrically connected to the first input end of the voltage sampling module; the fifth end of the switching component is electrically connected to the second input end of the voltage sampling module; and the output end of the voltage sampling module is electrically connected to the detection module. The switching component enables the first input end of the voltage sampling module and the first end of the sampling resistor to be connected in a first state, and the second input end of the voltage sampling module and the second end of the sampling resistor to be connected. The voltage sampling module can acquire the digital sampling voltage of the sampling resistor in the first state, where the digital sampling voltage represents the voltage difference across the sampling resistor. The detection module can detect whether the connection status of the sampling resistor is abnormal based on the digital sampling voltage and the digital reference voltage, where the digital reference voltage represents the voltage difference across the reference resistor. Thus, the resistor connection status detection circuit can detect whether the connection status of the sampling resistor is normal and determine the system current based on whether the connection status of the sampling resistor is normal, thereby improving the accuracy of the system current.

[0069] In some embodiments, the switching component 120 is also used to conduct the first input terminal of the voltage sampling module 110 and the first terminal of the reference resistor Rp, and the second input terminal of the voltage sampling module 110 and the second terminal of the reference resistor Rp in the second state.

[0070] The voltage sampling module 110 is also used to acquire the digital reference voltage Vcode' in the second state.

[0071] For example, in the second state, the second and fourth terminals of the switch assembly 120 are connected, and the third and fifth terminals of the switch assembly 120 are connected. Since the second terminal of the switch assembly 120 is electrically connected to the first terminal of the reference resistor Rp, the fourth terminal of the switch assembly 120 is electrically connected to the first input terminal of the voltage sampling module 110, the third terminal of the switch assembly 120 is electrically connected to the second terminal of the reference resistor Rp, and the fifth terminal of the switch assembly 120 is electrically connected to the second input terminal of the voltage sampling module 110, therefore, the first terminal of the reference resistor Rp is connected to the first input terminal of the voltage sampling module 110, and the second terminal of the reference resistor Rp is connected to the second input terminal of the voltage sampling module 110.

[0072] The voltage sampling module 110 can acquire the digital reference voltage Vcode' of the reference resistor Rp and transmit the digital reference voltage Vcode' to the detection module 130 so that the detection module 130 can detect whether the connection status of the sampling resistor Rs is abnormal.

[0073] In some embodiments, Figure 2 This is a schematic diagram of another resistor connection state detection circuit provided in an embodiment of this application. Figure 2 for Figure 1 Based on the embodiment shown, the switch assembly 120 includes a first switch S1, a second switch S2, a third switch S3, and a fourth switch S4. The first terminal of the first switch S1 is electrically connected to the first terminal of the sampling resistor Rs. The first terminals of the second switch S2 and the third switch S3 are both electrically connected to the second terminal of the sampling resistor Rs. The first terminal of the fourth switch S4 is electrically connected to the second terminal of the reference resistor Rp. The second terminals of the first switch S1 and the second terminals of the second switch S2 are both electrically connected to the first input terminal of the voltage sampling module 110. The second terminals of the third switch S3 and the second terminals of the fourth switch S4 are both electrically connected to the second input terminal of the voltage sampling module 120.

[0074] In the first state, both the first switch S1 and the third switch S3 are on, while both the second switch S2 and the fourth switch S4 are off. Since the first terminal of the first switch S1 is electrically connected to the first terminal of the sampling resistor Rs, and the second terminal of the first switch S1 is electrically connected to the first input terminal of the voltage sampling module 110, and the first terminal of the third switch S3 is electrically connected to the second terminal of the sampling resistor Rs, and the second terminal of the third switch S3 is electrically connected to the second input terminal of the voltage sampling module 120, the first terminal of the sampling resistor Rs is connected to the first input terminal of the voltage sampling module 110, and the second terminal of the sampling resistor Rs is connected to the second input terminal of the voltage sampling module 110.

[0075] In the second state, both the first switch S1 and the third switch S3 are open, while both the second switch S2 and the fourth switch S4 are closed. Since the first terminal of the second switch S2 is electrically connected to the first terminal of the reference resistor Rp, and the second terminal of the second switch S2 is electrically connected to the first input terminal of the voltage sampling module 110, and the first terminal of the fourth switch S4 is electrically connected to the second terminal of the reference resistor Rp, and the second terminal of the fourth switch S4 is electrically connected to the second input terminal of the voltage sampling module 110, the first terminal of the reference resistor Rp is connected to the first input terminal of the voltage sampling module 110, and the second terminal of the reference resistor Rp is connected to the second input terminal of the voltage sampling module 110.

[0076] Thus, based on the on / off states of the first switch S1, the second switch S2, the third switch S3, and the fourth switch S4, the sampling resistor Rs or the reference resistor Rp can be controlled to conduct with the voltage sampling module 110, so that the voltage sampling module 110 can obtain both the digital sampling voltage Vcode of the sampling resistor Rs and the digital reference voltage Vcode' of the reference resistor Rp.

[0077] In some embodiments, Figure 3 This is a schematic diagram of another resistor connection state detection circuit provided in an embodiment of this application. Figure 3 for Figure 1 Based on the embodiment shown, the voltage sampling module 110 includes an operational amplifier 111 and an analog-to-digital converter 112.

[0078] The first input terminal of the operational amplifier 111 is electrically connected to the fourth terminal of the switch assembly 120, the second input terminal of the operational amplifier 111 is electrically connected to the fifth terminal of the switch assembly 120, the output terminal of the operational amplifier 111 is electrically connected to the input terminal of the analog-to-digital converter 112, and the output terminal of the analog-to-digital converter 112 is electrically connected to the detection module 130.

[0079] Operational amplifier 111 is used to acquire the voltage difference across the sampling resistor Rs in the first state and amplify the voltage difference across the sampling resistor Rs to obtain the sampling voltage Vsns. Analog-to-digital converter 112 is used to convert the sampling voltage Vsns into a digital sampling voltage Vcode.

[0080] For example, such as Figure 3 As shown, the positive input terminal of operational amplifier 111 is electrically connected to the second terminal of the first switch S1 and the second terminal of the second switch S2, and the negative input terminal of operational amplifier 111 is electrically connected to the second terminal of the third switch S3 and the second terminal of the fourth switch S4. In the first state, both the first switch S1 and the third switch S3 are on, and both the second switch S2 and the fourth switch S4 are off. Therefore, the first terminal of the sampling resistor Rs is connected to the positive input terminal of operational amplifier 111, and the second terminal of the sampling resistor Rs is connected to the negative input terminal of operational amplifier 111. At this time, operational amplifier 111 can acquire the voltage difference Vsp-Vsn across the sampling resistor Rs, where Vsp-Vsn = Isns*Rs, and Isns is the system current. Operational amplifier 111 can also amplify Vsp-Vsn to obtain the sampling voltage Vsns, where Vsns = G(Vsp-Vsn) = G*Isns*Rs, and G is the gain of operational amplifier 111. The analog-to-digital converter 112 can convert the sampled voltage Vsns into a digital code stream to obtain the digital sampled voltage Vcode.

[0081] In the second state, both the second switch S2 and the fourth switch S4 are on, while both the first switch S1 and the third switch S3 are off. Therefore, the first terminal of the reference resistor Rp is connected to the positive input terminal of the operational amplifier 111, and the second terminal of the reference resistor Rp is connected to the negative input terminal of the operational amplifier 111. At this time, the operational amplifier 111 can acquire the voltage difference Vpp-Vpn across the reference resistor Rp, where Vpp-Vpn = Isns*Rp. The operational amplifier 111 can amplify Vpp-Vpn to obtain the reference voltage Vsns', where Vsns' = G(Vpp-Vpn) = G*Isns*Rp. The analog-to-digital converter 112 can convert the reference voltage Vsn' into a digital code stream to obtain the digital reference voltage Vcode'.

[0082] In this embodiment, the voltage sampling module includes an operational amplifier and an analog-to-digital converter (ADC). The first input terminal of the operational amplifier is electrically connected to the fourth terminal of the switching assembly, the second input terminal of the operational amplifier is electrically connected to the fifth terminal of the switching assembly, the output terminal of the operational amplifier is electrically connected to the input terminal of the ADC, and the output terminal of the ADC is electrically connected to the detection module. The operational amplifier can acquire the voltage difference across the sampling resistor in the first state, amplify the voltage difference across the sampling resistor to obtain the sampling voltage, and the ADC can convert the sampling voltage Vsns into a digital sampling voltage Vcode. Thus, based on the amplified voltage difference across the sampling resistor, it is convenient to detect the connection status of the resistor, which helps to improve the accuracy of the detection results.

[0083] This application also discloses a method for detecting the resistor connection state, applicable to the resistor connection state detection circuit provided in any of the above embodiments. Figure 4 This is a flowchart illustrating a method for detecting the state of a resistor connection provided in an embodiment of this application, as shown below. Figure 4 As shown, it includes:

[0084] S101, in the first state, the first input terminal of the voltage sampling module and the first terminal of the sampling resistor are turned on, and the second input terminal of the voltage sampling module and the second terminal of the sampling resistor are turned on.

[0085] For example, refer to Figures 1-3 As shown, the switch assembly 120 can receive control signals. If the received control signal is a first state control signal, the switch assembly 120 can connect its first terminal to its fourth terminal, and also connect its second terminal to its fifth terminal. The first terminal of the switch assembly 120 is electrically connected to the first terminal of the sampling resistor Rs, the fourth terminal of the switch assembly 120 is electrically connected to the first input terminal of the voltage sampling module 110, the second terminal of the switch assembly 120 is electrically connected to the second terminal of the sampling resistor Rs, and the fifth terminal of the switch assembly 120 is electrically connected to the second input terminal of the voltage sampling module 110. Therefore, the first terminal of the sampling resistor Rs is connected to the first input terminal of the voltage sampling module 110, and the second terminal of the sampling resistor Rs is connected to the second input terminal of the voltage sampling module 110.

[0086] Thus, in the first state, the switching component 120 can turn on the first input terminal of the voltage sampling module 120 and the first terminal of the sampling resistor Rs, and turn on the second input terminal of the voltage sampling module 120 and the second terminal of the sampling resistor Rs.

[0087] S102, in the first state, obtain the digital sampling voltage of the sampling resistor.

[0088] The digital sampling voltage is used to characterize the voltage difference across the sampling resistor.

[0089] The digital sampling voltage Vcode is the digital code stream of the voltage difference across the sampling resistor Rs, meaning that the digital sampling voltage Vcode can characterize the voltage difference across the sampling resistor Rs. In the first state, the system current flows through the sampling resistor Rs, and the voltage sampling module 110 can acquire the digital sampling voltage Vcode of the sampling resistor Rs.

[0090] The voltage sampling module 110 can acquire the digital sampling voltage Vcode of the sampling resistor Rs and transmit it to the detection module 130. Thus, the detection module 130 can obtain the digital sampling voltage Vcode of the sampling resistor Rs. The resistance value of the sampling resistor Rs is known, and the detection module 130 has a pre-set resistance value for Rs. Therefore, based on the digital sampling voltage Vcode and the resistance value of the sampling resistor Rs, the detection module 130 can calculate the system current.

[0091] S103, based on the digital sampling voltage and the digital reference voltage, detect whether the connection status of the sampling resistor is abnormal.

[0092] The digital reference voltage is used to characterize the voltage difference across the reference resistor.

[0093] The digital reference voltage Vcode' is a digital code stream representing the voltage difference across the reference resistor Rp. The reference resistor Rp can be a trace resistor on the system's printed circuit board, and thus the digital reference voltage Vcode' characterizes the voltage difference across the reference resistor Rp. The detection module 130 can obtain the digital reference voltage Vcode' through pre-setting or by measurement.

[0094] As a specific description of one possible implementation when executing S103, such as Figure 5 As shown:

[0095] S201, determine whether the ratio of digital sampling voltage to digital reference voltage is equal to a preset value.

[0096] If yes, execute S202; otherwise, execute S203.

[0097] When the sampling resistor Rs is connected normally, the digital sampling voltage Vcode and the digital reference voltage Vcode' satisfy: Vcode / Vcode' = Rs / Rp, where Rs is the resistance of the sampling resistor and Rp is the resistance of the reference resistor. Therefore, by checking whether the ratio of the digital sampling voltage Vcode to the digital reference voltage Vcode' equals the preset value Rs / Rp, it can be determined whether the connection state of the sampling resistor Rs is abnormal.

[0098] S202, confirm that the connection status of the sampling resistor is normal.

[0099] If Vcode / Vcode' = Rs / Rp, it means that the connection of the sampling resistor Rs is normal. In this case, Vcode / Rs is the system current.

[0100] S203, it is determined that the connection status of the sampling resistor is abnormal.

[0101] If Vcode / Vcode'≠Rs / Rp, it indicates that the connection state of the sampling resistor Rs is abnormal. In this case, Vcode / Rs is not the system current.

[0102] In this embodiment, by turning on the first input terminal of the voltage sampling module and the first terminal of the sampling resistor in the first state, and turning on the second input terminal of the voltage sampling module and the second terminal of the sampling resistor, the digital sampling voltage of the sampling resistor is obtained in the first state. The digital sampling voltage is used to characterize the voltage difference across the sampling resistor. Based on the digital sampling voltage and the digital reference voltage, the connection status of the sampling resistor is detected to be abnormal. The digital reference voltage is used to characterize the voltage difference across the reference resistor. In this way, the connection status of the sampling resistor can be detected to be normal, and the system current can be determined based on whether the connection status of the sampling resistor is normal, which can improve the accuracy of the system current.

[0103] Figure 6 This is a flowchart illustrating another method for detecting the resistor connection state provided in an embodiment of this application. Figure 6 for Figure 5 Based on the illustrated embodiment, a specific description of one possible implementation of S203 is provided below:

[0104] S2031, if the digital sampling voltage is less than the first threshold voltage, it is determined that the sampling resistor is short-circuited.

[0105] For example, the digital sampling voltage Vcode is compared with the first threshold voltage Vth1, where Vth1 is a value approximately equal to 0. If the digital sampling voltage Vcode is less than the first threshold voltage Vth1, then the digital sampling voltage Vcode can be considered approximately 0, i.e., Vcode≈0. In this case, it can be determined that the connection state of the sampling resistor Rs is abnormal, and that the connection state of the sampling resistor Rs is short-circuited.

[0106] S2032, if the digital sampling voltage is greater than the second threshold voltage, determine that the sampling resistor is open.

[0107] The second threshold voltage is greater than the first threshold voltage.

[0108] For example, the digital sampling voltage Vcode is compared with the second threshold voltage Vth2, where the second threshold voltage Vth2 is approximately the maximum value that the voltage sampling module 110 can output. If the digital sampling voltage Vcode is greater than the second threshold voltage Vth2, then the digital sampling voltage Vcode can be considered to be approximately the maximum value that the voltage sampling module 110 can output, i.e., Vcode≈Vmax. In this case, it can be determined that the connection state of the sampling resistor Rs is abnormal, and the connection state of the sampling resistor Rs is open circuit.

[0109] In this embodiment, if the digital sampling voltage is less than the first threshold voltage, the sampling resistor is determined to be short-circuited; if the digital sampling voltage is greater than the second threshold voltage, the sampling resistor is determined to be open-circuited. Wherein, if the second threshold voltage is greater than the first threshold voltage, the specific type of abnormal connection state of the sampling resistor can be further determined, which is helpful in locating the point of abnormal resistor connection.

[0110] Figure 7 This is a flowchart illustrating another method for detecting the resistor connection state provided in an embodiment of this application. Figure 7 for Figure 5 Based on the illustrated embodiment, before executing S103, the following steps are also included:

[0111] S301, in the second state, the first input terminal of the voltage sampling module and the first terminal of the reference resistor are turned on, and the second input terminal of the voltage sampling module and the second terminal of the reference resistor are turned on.

[0112] For example, refer to Figures 1-3As shown, before receiving the first state control signal, the switch assembly 120 receives the second state control signal. Under the action of the second state control signal, the switch assembly 120 can connect its second terminal to its fourth terminal, and also connect its third terminal to its fifth terminal. The fourth terminal of the switch assembly 120 is electrically connected to the first input terminal of the voltage sampling module 110, the third terminal is electrically connected to the second terminal of the reference resistor Rp, and the fifth terminal is electrically connected to the second input terminal of the voltage sampling module 110. Therefore, the first terminal of the reference resistor Rp is connected to the first input terminal of the voltage sampling module 110, and the second terminal of the reference resistor Rp is connected to the second input terminal of the voltage sampling module 110.

[0113] Thus, in the second state, the switching component 120 can turn on the first input terminal of the voltage sampling module 120 and the first terminal of the reference resistor Rp, and turn on the second input terminal of the voltage sampling module 120 and the second terminal of the reference resistor Rp.

[0114] S302, Obtain the digital reference voltage.

[0115] The voltage sampling module 110 can collect the digital reference voltage Vcode' of the reference resistor Rp and transmit the digital reference voltage Vcode' of the reference resistor Rp to the detection module 130. In this way, the detection module 130 can obtain the digital reference voltage Vcode' of the reference resistor Rp.

[0116] It should be noted that, Figure 7 This example only demonstrates that S301-S302 are executed before S101. In practical applications, S301-S302 can also be executed after S102.

[0117] In this embodiment, by turning on the first input terminal of the voltage sampling module and the first terminal of the reference resistor in the second state, and turning on the second input terminal of the voltage sampling module and the second terminal of the reference resistor, a digital reference voltage is obtained. In this way, the digital reference voltage and the digital sampling voltage can be obtained based on the same circuit, which can improve the accuracy of the ratio of the digital sampling voltage to the digital reference voltage, thereby improving the accuracy of the detection results.

[0118] Figure 8 This is a flowchart illustrating another method for detecting the resistor connection state provided in an embodiment of this application. Figure 8 for Figure 5 Based on the illustrated embodiment, before executing S103, the following steps are also included:

[0119] S401, obtain the digital calibration voltage when the calibration resistor is properly connected.

[0120] For example, a calibration resistor is connected to the system, replacing the sampling resistor Rs, and it is ensured that the calibration resistor is properly connected. Under the action of the first state control signal, the switching component 120 can turn on the first input terminal of the voltage sampling module 120 and the first terminal of the calibration resistor, and turn on the second input terminal of the voltage sampling module 120 and the second terminal of the calibration resistor.

[0121] At this time, the voltage sampling module 110 can collect the digital calibration voltage "Vcode" of the calibration resistor. "Vcode" is a digital code stream representing the voltage difference across the calibration resistor, that is, "Vcode" can characterize the voltage difference across the calibration resistor. The voltage sampling module 110 can also transmit the digital calibration voltage "Vcode" of the calibration resistor to the detection module 130, so that the detection module 130 can obtain the digital calibration voltage "Vcode" of the calibration resistor.

[0122] S402, determine the preset value based on the ratio of the digital calibration voltage to the digital reference voltage.

[0123] For example, if the calibration resistor and the sampling resistor are of the same specification, then the resistance value of the calibration resistor is Rs' = Rs. In this case, the ratio of the resistance value of the calibration resistor to the resistance value of the reference resistor can be used as the preset value, that is, the preset value is Rs / Rp. The resistance value Rp of the reference resistor is usually unknown, but the resistance Rs of the calibration resistor is known. Based on Rs / Rp = Vcode” / Vcode', the preset value Rs / Rp can be calculated.

[0124] If the calibration resistor and the sampling resistor are resistors of different specifications, and according to the specifications, the resistance value Rs' of the calibration resistor is N times the resistance value Rs of the sampling resistor, where N is an integer greater than or equal to 2, i.e., Rs' = N * Rs. In this case, based on Rs' / Rp = Vcode” / Vcode', we can obtain Rs / Rp = N * Vcode” / Vcode', which means that the preset value Rs / Rp can be calculated.

[0125] In summary, if the resistance of the calibration resistor is N times the resistance of the sampling resistor Rs, and N is an integer greater than or equal to 1, then N times the ratio of the digital calibration voltage Vcode” to the digital reference voltage Vcode' can be determined as the preset value Rs / Rp, that is, Rs / Rp=N*Vcode” / Vcode'.

[0126] Figure 9 This is a flowchart illustrating another method for detecting the resistor connection state provided in an embodiment of this application. Figure 9 for Figure 4 Based on the illustrated embodiment, a specific description of a possible implementation of S102 is as follows:

[0127] S1021, Collect the voltage difference across the sampling resistor and amplify the voltage difference across the sampling resistor to obtain the sampling voltage.

[0128] For example, such as Figure 3 As shown, the positive input terminal of operational amplifier 111 is electrically connected to the second terminal of the first switch S1 and the second terminal of the second switch S2, and the negative input terminal of operational amplifier 111 is electrically connected to the second terminal of the third switch S3 and the second terminal of the fourth switch S4. In the first state, both the first switch S1 and the third switch S3 are on, and both the second switch S2 and the fourth switch S4 are off. Therefore, the first terminal of the sampling resistor Rs is connected to the positive input terminal of operational amplifier 111, and the second terminal of the sampling resistor Rs is connected to the negative input terminal of operational amplifier 111. At this time, operational amplifier 111 can acquire the voltage difference Vsp-Vsn across the sampling resistor Rs, where Vsp-Vsn = Isns*Rs, and Isns is the system current. Operational amplifier 111 can also amplify Vsp-Vsn to obtain the sampling voltage Vsns, where Vsns = G(Vsp-Vsn) = G*Isns*Rs, and G is the gain of operational amplifier 111.

[0129] In the second state, both the second switch S2 and the fourth switch S4 are on, while both the first switch S1 and the third switch S3 are off. Therefore, the first terminal of the reference resistor Rp is connected to the positive input terminal of the operational amplifier 111, and the second terminal of the reference resistor Rp is connected to the negative input terminal of the operational amplifier 111. At this time, the operational amplifier 111 can acquire the voltage difference Vpp-Vpn across the reference resistor Rp, where Vpp-Vpn = Isns*Rp. The operational amplifier 111 can amplify Vpp-Vpn to obtain the reference voltage Vsns', where Vsns' = G(Vpp-Vpn) = G*Isns*Rp.

[0130] S1022, convert the sampled voltage into the digital sampled voltage.

[0131] The analog-to-digital converter 112 can convert the sampled voltage Vsns into a digital code stream to obtain the digital sampled voltage Vcode. In addition, the analog-to-digital converter 112 can also convert the reference voltage Vsn' into a digital code stream to obtain the digital reference voltage Vcode'.

[0132] In this embodiment, the voltage difference across the sampling resistor is collected and amplified to obtain the sampling voltage. The sampling voltage is then converted into a digital sampling voltage. Thus, based on the amplified voltage difference across the sampling resistor, the connection status of the resistor can be easily detected, which helps to improve the accuracy of the detection results.

[0133] The above-disclosed embodiments are merely specific examples of this application. However, the embodiments of this application are not limited thereto, and any variations that can be conceived by those skilled in the art should fall within the protection scope of this application.

[0134] The term "comprising" as used in this application does not exclude the presence of elements or steps not listed in the claims. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. This application can be implemented by means of hardware comprising several different elements and by means of a suitably programmed computer. In the unit claims listing several means, several units of these means may be embodied by the same item of hardware. The use of "first," "second," and "third," etc., does not indicate any order and should be interpreted as names. Unless otherwise specified, the steps in the above embodiments should not be construed as limiting the order of execution.

[0135] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications 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.

Claims

1. A detection circuit for the resistive connection state, characterized in that, include: Voltage sampling module, sampling resistor, reference resistor, switching assembly, and detection module; The first end of the sampling resistor is electrically connected to the first end of the switching assembly, the second end of the sampling resistor is electrically connected to the second end of the switching assembly and the first end of the reference resistor, the second end of the reference resistor is electrically connected to the third end of the switching assembly, the fourth end of the switching assembly is electrically connected to the first input end of the voltage sampling module, the fifth end of the switching assembly is electrically connected to the second input end of the voltage sampling module, and the output end of the voltage sampling module is electrically connected to the detection module. The switching assembly is used to turn on the first input terminal of the voltage sampling module and the first terminal of the sampling resistor in the first state, and to turn on the second input terminal of the voltage sampling module and the second terminal of the sampling resistor. The voltage sampling module is used to acquire the digital sampling voltage of the sampling resistor in the first state, wherein the digital sampling voltage is used to characterize the voltage difference across the sampling resistor; The detection module is used to detect whether the connection status of the sampling resistor is abnormal based on the digital sampling voltage and the digital reference voltage, wherein the digital reference voltage is used to characterize the voltage difference across the reference resistor; The switching assembly is also used to turn on the first input terminal of the voltage sampling module and the first terminal of the reference resistor in the second state, and to turn on the second input terminal of the voltage sampling module and the second terminal of the reference resistor; The voltage sampling module is also used to acquire the digital reference voltage in the second state; The switching assembly includes a first switch, a second switch, a third switch, and a fourth switch; The first terminal of the first switch is electrically connected to the first terminal of the sampling resistor, the first terminals of the second switch and the third switch are both electrically connected to the second terminal of the sampling resistor, the first terminal of the fourth switch is electrically connected to the second terminal of the reference resistor, the second terminals of the first switch and the second switches are both electrically connected to the first input terminal of the voltage sampling module, and the second terminals of the third switch and the fourth switch are both electrically connected to the second input terminal of the voltage sampling module. In the first state, both the first and third switches are on, and both the second and fourth switches are off; in the second state, both the first and third switches are off, and both the second and fourth switches are on. The detection module is specifically used to determine whether the ratio of the digital sampling voltage to the digital reference voltage is equal to a preset value; if yes, it determines that the connection status of the sampling resistor is normal; if no, it determines that the connection status of the sampling resistor is abnormal.

2. The detection circuit for the resistive connection state according to claim 1, characterized in that, The voltage sampling module includes an operational amplifier and an analog-to-digital converter; The first input terminal of the operational amplifier is electrically connected to the fourth terminal of the switching assembly, the second input terminal of the operational amplifier is electrically connected to the fifth terminal of the switching assembly, the output terminal of the operational amplifier is electrically connected to the input terminal of the analog-to-digital converter, and the output terminal of the analog-to-digital converter is electrically connected to the detection module. The operational amplifier is used to acquire the voltage difference across the sampling resistor in the first state and amplify the voltage difference across the sampling resistor to obtain the sampling voltage. The analog-to-digital converter is used to convert the sampled voltage into the digital sampled voltage.

3. A method for detecting the state of a resistor connection, characterized in that, The method, applicable to the detection circuit for the resistive connection state as described in claim 1, comprises: In the first state, the first input terminal of the voltage sampling module and the first terminal of the sampling resistor are turned on, and the second input terminal of the voltage sampling module and the second terminal of the sampling resistor are turned on. In the first state, the digital sampling voltage of the sampling resistor is obtained, wherein the digital sampling voltage is used to characterize the voltage difference across the sampling resistor; Based on the digital sampling voltage and the digital reference voltage, the connection status of the sampling resistor is detected to be abnormal, wherein the digital sampling voltage is used to characterize the voltage difference across the sampling resistor.

4. The method for detecting the resistive connection state according to claim 3, characterized in that, The step of detecting whether the connection status of the sampling resistor is abnormal based on the digital sampling voltage and the digital reference voltage includes: If the ratio of the digital sampling voltage to the digital reference voltage is equal to a preset value, it is determined that the connection status of the sampling resistor is normal. If the ratio of the digital sampling voltage to the digital reference voltage is not equal to the preset value, the connection status of the sampling resistor is determined to be abnormal.

5. The method for detecting the resistive connection state according to claim 4, characterized in that, The determination of an abnormal connection status of the sampling resistor includes: If the digital sampling voltage is less than the first threshold voltage, it is determined that the sampling resistor is short-circuited; If the digital sampling voltage is greater than the second threshold voltage, the sampling resistor is determined to be open; wherein the second threshold voltage is greater than the first threshold voltage.

6. The method for detecting the resistive connection state according to claim 4, characterized in that, Before detecting whether the connection status of the sampling resistor is abnormal based on the digital sampling voltage and the digital reference voltage, the method further includes: In the second state, the first input terminal of the voltage sampling module and the first terminal of the reference resistor are turned on, and the second input terminal of the voltage sampling module and the second terminal of the reference resistor are turned on. The digital reference voltage is acquired in the second state.

7. The method for detecting the resistive connection state according to claim 4, characterized in that, Before detecting whether the connection status of the sampling resistor is abnormal based on the digital sampling voltage and the digital reference voltage, the method further includes: Obtain the digital calibration voltage when the calibration resistor is properly connected; The preset value is determined based on the ratio of the digital calibration voltage to the digital reference voltage.

8. The method for detecting the resistive connection state according to claim 7, characterized in that, The resistance of the calibration resistor is N times the resistance of the sampling resistor; Determining the preset value based on the ratio of the digital calibration voltage to the digital reference voltage includes: The preset value is determined as N times the ratio of the digital calibration voltage to the digital reference voltage.

9. The method for detecting the resistive connection state according to claim 3, characterized in that, The process of obtaining the digital sampling voltage of the sampling resistor includes: The voltage difference across the sampling resistor is collected, and the voltage difference across the sampling resistor is amplified to obtain the sampling voltage; The sampled voltage is converted into the digital sampled voltage.

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