Cable detection circuit and cable detector for realizing detection of multiple electrical parameters
By designing a cable detection circuit, the voltage, current and resistance of the cable can be detected, which solves the problem that the existing technology can only detect voltage and improves the convenience of detection.
Patent Information
- Application Number
- CN202520223700.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-11
- Publication Date
- 2026-01-06
- Estimated Expiration
- 2035-02-11
AI Technical Summary
Existing underground cable detectors can only detect AC and DC voltages, but cannot detect current and resistance.
A cable detection circuit was designed, including a multimeter detection circuit, a main control circuit, and a transmitting circuit. It can detect the voltage, current, and resistance of the cable. The main control circuit is connected through the communication terminal of the multimeter detection circuit, the input terminal of the transmitting circuit is connected to the cable, and the output terminal of the transmitting circuit is connected to the cable.
It enables efficient and accurate cable tracing and can detect cable voltage, current and resistance without the need for a multimeter, thus improving the convenience of testing.
Smart Images
Figure CN223770414U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of cable detection technology, and in particular to a cable detection circuit and cable detector for detecting multiple electrical parameters. Background Technology
[0002] An underground cable detector is an instrument used to locate cables hidden underground or within walls. It typically consists of a transmitter and a receiver. The transmitter has a positive and a negative output port. In use, test leads or alligator clips are connected to the positive and negative ports respectively, and then connected to the cable to be detected. The transmitter emits a detection signal to the underground cable, which is then received by the user by moving the receiver, which then indicates the cable's location to the user.
[0003] However, in practice, it has been found that existing underground cable detectors only have voltage detection function, that is, they can only detect AC voltage and DC voltage, but cannot detect current or resistance.
[0004] Therefore, it is necessary to propose a multifunctional cable detector that can not only detect the voltage of the cable, but also the resistance and current of the cable. Utility Model Content
[0005] This invention provides a cable detection circuit and cable detector for detecting multiple electrical parameters. It can efficiently and accurately locate cables and can detect not only the voltage of the cable, but also the resistance and current of the cable.
[0006] The first aspect of this utility model discloses a cable detection circuit for detecting multiple electrical parameters. The cable detection circuit includes a multimeter detection circuit 101, a main control circuit 102, and a transmitting circuit 103. The multimeter detection circuit 101 is electrically connected to the communication terminal of the main control circuit 102, the transmitting circuit 103 is electrically connected to the signal terminal of the main control circuit 102, and the transmitting circuit 103 is electrically connected to the timing control terminal of the main control circuit 102.
[0007] The input terminal of the multimeter detection circuit 101 is used to electrically connect the cable, and the output terminal of the transmitting circuit 103 is used to electrically connect the cable to the cable detection circuit.
[0008] As an optional implementation, in the first aspect of this utility model, the multimeter detection circuit 101 includes a current detection circuit 1011, a voltage and resistance detection circuit 1012, a multimeter control circuit 1013, and a range switching circuit 1014, wherein:
[0009] The output terminal of the current detection circuit 1011 is electrically connected to the first acquisition terminal of the multimeter control circuit 1013; the common terminal of the current detection circuit 1011 is electrically connected to the common terminal of the multimeter control circuit 1013; the selection terminal of the current detection circuit 1011 is electrically connected to the first selection terminal of the range switching circuit 1014; and the input terminal of the current detection circuit 1011 is used to electrically connect to the cable.
[0010] The output terminal of the voltage resistance detection circuit 1012 is electrically connected to the second acquisition terminal of the multimeter control circuit 1013, the selection terminal of the voltage resistance detection circuit 1012 is electrically connected to the second selection terminal of the range switching circuit 1014, and the input terminal of the voltage resistance detection circuit 1012 is used to electrically connect the cable.
[0011] The data terminal of the gear switching circuit 1014 is electrically connected to the data terminal of the multimeter control circuit 1013;
[0012] The communication terminal of the multimeter control circuit 1013 is electrically connected to the communication terminal of the main control circuit 102.
[0013] As an optional implementation, in the first aspect of this utility model, the gear switching circuit 1014 includes a first transistor Q15, a second transistor Q16, a third transistor Q17, a fourth transistor Q18, and a relay RLY1, wherein:
[0014] The collectors of the first transistor Q15 and the second transistor Q16 are electrically connected to the first terminal of the relay RLY1, and the collectors of the third transistor Q17 and the fourth transistor Q18 are electrically connected to the second terminal of the relay RLY1.
[0015] The bases of the first transistor Q15, the second transistor Q16, the third transistor Q17, and the fourth transistor Q18 are all electrically connected to the data terminal of the multimeter control circuit 1013.
[0016] The emitter of the first transistor Q15 and the emitter of the third transistor Q17 are used to connect to the power supply module, and the emitter of the second transistor Q16 and the emitter of the fourth transistor Q18 are used to ground.
[0017] As an optional implementation, in the first aspect of this utility model, the cable detection circuit further includes a power consumption switch switching circuit 104, wherein:
[0018] The power consumption switching circuit 104 includes a first power consumption switching circuit 1041 or a second power consumption switching circuit 1042, wherein:
[0019] The output terminal of the first power consumption switch circuit 1041 is electrically connected to the power supply terminal of the multimeter control circuit 1013 and the power supply terminal of the range switching circuit 1014.
[0020] The output terminal of the second power consumption switch circuit 1042 is electrically connected to the power supply terminal of the multimeter control circuit 1013 and the power supply terminal of the range switching circuit 1014, and the controlled terminal of the second power consumption switch circuit 1042 is electrically connected to the power control terminal of the main control circuit 102.
[0021] As an optional implementation, in the first aspect of this utility model, the cable detection circuit further includes a power supply circuit 105, wherein the power supply circuit 105 includes a power module 1051 and a power management module 1052, wherein the power module 1051 includes a first power supply unit 10511, wherein:
[0022] The output terminal of the power management module 1052 is electrically connected to the input terminal of the first power unit 10511, the controlled terminal of the power management module 1052 is electrically connected to the power control terminal of the main control circuit 102, and the input terminal of the power management module 1042 is used to electrically connect to the energy storage battery.
[0023] The output terminal of the first power supply unit 10511 is electrically connected to the input terminal of the power consumption switch switching circuit 104 and the input terminal of the main control circuit 102, respectively.
[0024] As an optional implementation, in the first aspect of this utility model, the power supply circuit 105 further includes a power detection module 1053, wherein:
[0025] The input terminal of the power detection module 1053 is electrically connected to the output terminal of the power management module 1052, and the output terminal of the power detection module 1053 is electrically connected to the battery control terminal of the main control circuit 102.
[0026] The power detection module 1053 is used to electrically connect to the energy storage battery, and the grounding terminal of the power detection module 1053 is used for grounding.
[0027] As an optional implementation, in the first aspect of this utility model, the power supply circuit further includes a charging module 1054, wherein:
[0028] The status terminal of the charging module 1054 is electrically connected to the status control terminal of the main control circuit 102, and the output terminal of the charging module 1054 is used to electrically connect to the energy storage battery.
[0029] As an optional implementation, in the first aspect of this utility model, the multimeter detection circuit 101 further includes a prompting circuit 1015, wherein the prompting circuit 1015 includes a first resistor R86, a second resistor R87, a third resistor R93, a fifth transistor Q19, and a buzzer BZ1, wherein:
[0030] One end of the third resistor R93 is electrically connected to the prompt control terminal of the main control circuit 102, and the other end of the third resistor R93 is electrically connected to the base of the fifth transistor Q19 and one end of the second resistor R87. The other end of the second resistor R87 is electrically connected to the prompt control terminal of the multimeter control circuit 1013. The collector of the fifth transistor Q19 is electrically connected to one end of the buzzer BZ1, and the other end of the buzzer BZ1 is grounded through the first resistor R86. The emitter of the fifth transistor Q19 is used for grounding.
[0031] As an optional implementation, in the first aspect of this utility model, the cable detection circuit further includes a transmitting circuit 103, wherein:
[0032] The transmitting circuit 103 includes a signal transmitting circuit 1031, a signal frequency division circuit 1032, a signal amplification circuit 1033, and a timing control circuit 1034, wherein:
[0033] The input terminal of the signal frequency divider circuit 1032 is electrically connected to the signal terminal of the main control circuit 102, the output terminal of the signal frequency divider circuit 1032 is electrically connected to the input terminal of the signal amplification circuit 1033, the output terminal of the signal amplification circuit 1033 is electrically connected to the signal transmitting circuit 1031, and the output terminal of the signal transmitting circuit 1031 is used to electrically connect the cable.
[0034] The timing terminal of the timing control circuit 1034 is electrically connected to the timing control terminal of the main control circuit 102, and the output terminal of the timing control circuit 1034 is electrically connected to the timing controlled terminal of the signal amplification circuit 1033.
[0035] The power module 1051 further includes a second power unit 10512, wherein:
[0036] The output terminal of the power management module 1052 is electrically connected to the input terminal of the second power unit 10512, and the output terminal of the second power unit 10512 is electrically connected to the voltage input terminal of the signal transmitting circuit 1031, the voltage input terminal of the signal frequency division circuit 1032, the voltage input terminal of the signal amplification circuit 1033, and the power supply terminal of the timing control circuit 1034.
[0037] As an optional implementation, in the first aspect of this utility model, the signal frequency division circuit 1032 includes a first signal frequency division unit 10321 or a second signal frequency division unit 10322, wherein:
[0038] The first signal frequency division unit 10321 includes a fourth resistor R37, and the second signal frequency division unit 10322 includes a first frequency divider U4-B and a second frequency divider U4-A, wherein:
[0039] One end of the fourth resistor R37 is electrically connected to the signal terminal of the main control circuit 102, and the other end of the fourth resistor R37 is electrically connected to the input terminal of the signal amplification circuit 1033.
[0040] One end of the first frequency divider U4-B is electrically connected to the signal terminal of the main control circuit 102, the output terminal of the first frequency divider U4-B is electrically connected to the input terminal of the second frequency divider U4-A, and the output terminal of the second frequency divider U4-A is electrically connected to the input terminal of the signal amplification circuit 1033.
[0041] The second aspect of this utility model discloses a cable detector, which includes the cable detection circuit described in any one of the present utility model for detecting multiple electrical parameters.
[0042] Compared with the prior art, the present invention has the following beneficial effects:
[0043] In this invention, the cable detection circuit includes a multimeter detection circuit, a main control circuit, and a transmitting circuit. The communication terminal of the multimeter detection circuit is electrically connected to the communication terminal of the main control circuit, the input terminal of the transmitting circuit is electrically connected to the signal terminal of the main control circuit, and the timing terminal of the transmitting circuit is electrically connected to the timing control terminal of the main control circuit. The input terminal of the multimeter detection circuit is used to electrically connect to the cable, and the output terminal of the transmitting circuit is used to electrically connect to the cable. Therefore, the cable detection circuit of this invention has a simple structure, can efficiently and accurately locate cables, and can detect not only the voltage of the cable but also its current and resistance. It eliminates the need for a multimeter, thus achieving the functions of a multimeter and improving the convenience of detecting the voltage, current, and resistance of cables. Attached Figure Description
[0044] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0045] Figure 1This is a schematic diagram of the structure of a cable detection circuit for detecting multiple electrical parameters disclosed in an embodiment of this utility model;
[0046] Figure 2 This is a schematic diagram of the structure of a gear switching circuit disclosed in an embodiment of this utility model;
[0047] Figure 3 This is a schematic diagram of the structure of a multimeter control circuit disclosed in an embodiment of the present invention;
[0048] Figure 4 This is a schematic diagram of the structure of a current detection circuit disclosed in an embodiment of this utility model;
[0049] Figure 5 This is a schematic diagram of the structure of a voltage resistance detection circuit disclosed in an embodiment of this utility model;
[0050] Figure 6 This is a schematic diagram of the structure of a main control circuit disclosed in an embodiment of this utility model;
[0051] Figure 7 This is a schematic diagram of the structure of a power consumption switch switching circuit disclosed in an embodiment of this utility model;
[0052] Figure 8 This is a schematic diagram of another power consumption switch switching circuit disclosed in an embodiment of this utility model;
[0053] Figure 9 This is a schematic diagram of the structure of a power supply circuit disclosed in an embodiment of this utility model;
[0054] Figure 10 This is a schematic diagram of the structure of a power management module and a charging module disclosed in an embodiment of this utility model;
[0055] Figure 11 This is a schematic diagram of the structure of a power module disclosed in an embodiment of this utility model;
[0056] Figure 12 This is a schematic diagram of the structure of a power detection module disclosed in an embodiment of this utility model;
[0057] Figure 13 This is a schematic diagram of the structure of a prompting circuit disclosed in an embodiment of this utility model;
[0058] Figure 14 This is a schematic diagram of the structure of a transmitting circuit disclosed in an embodiment of this utility model;
[0059] Figure 15 This is a schematic diagram of the structure of a button circuit disclosed in an embodiment of this utility model;
[0060] Figure 16This is a schematic diagram of the structure of a display circuit disclosed in an embodiment of this utility model. Detailed Implementation
[0061] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0062] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, apparatus, product, or end that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or ends.
[0063] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the present invention. The appearance of this phrase 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.
[0064] This utility model discloses a cable detection circuit and cable detector for detecting multiple electrical parameters. Through a simple circuit structure, it can efficiently and accurately locate cables and detect their voltage, current, and resistance without requiring a multimeter, thus achieving multimeter functionality and improving the convenience of detecting cable voltage, current, and resistance. The following descriptions are in conjunction with... Figure 1-16 This invention provides a detailed description of the various electrical parameter detection circuits and cable detectors involved in this invention.
[0065] Example 1
[0066] Please see Figure 1 , Figure 1 This is a schematic diagram of a cable detection circuit for detecting multiple electrical parameters, as disclosed in an embodiment of this utility model. Figure 1As shown, the cable detection circuit includes a multimeter detection circuit 101, a main control circuit 102, and a transmitting circuit 103. The communication terminal of the multimeter detection circuit 101 is electrically connected to the communication terminal of the main control circuit 102, the input terminal of the transmitting circuit 103 is electrically connected to the signal terminal of the main control circuit 102, and the timing terminal of the transmitting circuit 103 is electrically connected to the timing control terminal of the main control circuit 102. The input terminal of the multimeter detection circuit 101 is used to electrically connect the cable, and the output terminal of the transmitting circuit 103 is used to electrically connect the cable.
[0067] Optionally, the multimeter detection circuit 101 includes a current detection circuit 1011, a voltage and resistance detection circuit 1012, a multimeter control circuit 1013, and a range switching circuit 1014, wherein:
[0068] The output terminal of the current detection circuit 1011 is electrically connected to the first acquisition terminal of the multimeter control circuit 1013; the common terminal of the current detection circuit 1011 is electrically connected to the common terminal of the multimeter control circuit 1013; the selection terminal of the current detection circuit 1011 is electrically connected to the first selection terminal of the range switching circuit 1014; and the input terminal of the current detection circuit 1011 is used for electrical connection of the cable. The output terminal of the voltage and resistance detection circuit 1012 is electrically connected to the second acquisition terminal of the multimeter control circuit 1013; and the selection terminal of the voltage and resistance detection circuit 1012 is electrically connected to the second selection terminal of the range switching circuit 1014. The input terminal of the voltage and resistance detection circuit 1012 is used to electrically connect the cable; the data terminal of the gear shifting circuit 1014 is electrically connected to the data terminal of the multimeter control circuit 1013; the communication terminal of the multimeter control circuit 1013 is electrically connected to the communication terminal of the main control circuit 102; the grounding terminals of the main control circuit 102, the multimeter control circuit 1013, and the gear shifting circuit 1014 are used for grounding; the power supply terminals of the multimeter control circuit 1013 and the gear shifting circuit 1014 are used to electrically connect to the first power supply voltage, and the power supply terminal of the main control circuit 102 is used to electrically connect to the second power supply voltage.
[0069] Optionally, the cable detection circuit may further include a button circuit 106 and a display circuit 107. The main control circuit 102 is electrically connected to the button circuit 106 and the display circuit 107. The grounding terminals of the button circuit 106 and the display circuit 107 are used for grounding.
[0070] Optional, such as Figure 2As shown, the gear shifting circuit 1014 includes a first transistor Q15, a second transistor Q16, a third transistor Q17, a fourth transistor Q18, and a relay RLY1. The collectors of the first transistor Q15 and the second transistor Q16 are electrically connected to the first terminal of the relay RLY1; the collectors of the third transistor Q17 and the fourth transistor Q18 are electrically connected to the second terminal of the relay RLY1; the bases of the first transistor Q15, the second transistor Q16, the third transistor Q17, and the fourth transistor Q18 are all electrically connected to the multimeter control circuit 101. 3 is the data terminal; the emitters of the first transistor Q15 and the third transistor Q17 are used to connect to the power supply module, the emitters of the second transistor Q16 and the fourth transistor Q18 are used for grounding, interfaces 3 and 6 of relay RLY1 are electrically connected to the selection terminals of the resistor voltage detection circuit 1012, and interfaces 4 and 5 of relay RLY1 are electrically connected to the selection terminals of the current detection circuit 1011; furthermore, the gear switching circuit 1014 also includes resistors R80, R81, R82, R83, R84, and R85, the electrical connection relationships of which are detailed in [reference needed]. Figure 2 As shown.
[0071] Optionally, the multimeter control circuit 1013 can be specifically as follows: Figure 3 As shown, this specifically includes the multimeter testing chip U8 and its peripheral electronic components. Details of the peripheral electronic components of the multimeter testing chip U8 and their interconnections can be found in [link to documentation]. Figure 3 Optionally, the multimeter detection chip U8 can be SD7051.
[0072] Optionally, the current detection circuit 1011 can be specifically as follows: Figure 4 As shown, the electronic components included in the current detection circuit 1011 (specifically resistors R74-R76, diodes D7-D10, capacitor C41, transistors Q13 and Q14, and device F1) and their connections are detailed in [reference needed]. Figure 4 .
[0073] Optionally, the voltage-resistance detection circuit 1012 can be specifically as follows: Figure 5 As shown, the electronic components (specifically resistors R68-R73 and variable resistor PTC1) included in the voltage-resistance detection circuit 1012 and their connection relationships are detailed in [reference needed]. Figure 5 .
[0074] Optionally, the main control circuit 102 can be specifically as follows: Figure 6 As shown, the main control circuit 102 specifically includes the main control chip U7 and its peripheral electronic components. Details of the peripheral electronic components of the main control chip U7 and their interconnections are provided below. Figure 6Optionally, the main control chip U7 is STM32F103RBT6.
[0075] Optionally, the button circuit 106 can be specifically as follows: Figure 15 As shown, the button circuit 106 may specifically include one or more buttons K1 to K7. Details of the connection relationships between buttons K1 to K7 and between buttons K7 and other electronic components are provided below. Figure 15 .
[0076] Optionally, the display circuit 107 can be specifically as follows: Figure 16 As shown, the display circuit 107 specifically includes interface P1 and other electronic components. The connection relationships between interface P1 and other electronic components (specifically resistors R34 and R35, and transistor Q7) are detailed below. Figure 16 Interface P1 is electrically connected to the liquid crystal display via LCD_LIGHT.
[0077] As can be seen, the circuit described in this embodiment of the present invention for detecting multiple electrical parameters has a simple structure and low cost. It can efficiently and accurately locate cables and can detect not only the voltage of the cable but also the current and resistance of the cable. It does not require a multimeter, thus realizing the function of a multimeter and improving the convenience of detecting the voltage, current and resistance of the cable. Furthermore, the main control circuit 102, the button circuit 106 and the display circuit 107 can display the detected voltage, current and resistance, making it convenient for users to check the status of the cable.
[0078] In an optional embodiment, such as Figure 7 As shown, the cable detection circuit also includes a power consumption switch switching circuit 104, which generates a first supply voltage. The power consumption switch switching circuit 104 includes a first power consumption switch circuit 1041 or a second power consumption switch switching circuit 1042, wherein:
[0079] The output terminal of the first power consumption switch circuit 1041 is electrically connected to the power supply terminal of the multimeter control circuit 1013 and the power supply terminal of the range switching circuit 1014. The input terminal of the first power consumption switch circuit 1041 is used to electrically connect to the second power supply voltage, and the ground terminal of the first power consumption switch circuit 1041 is used for grounding. The output terminal of the second power consumption switch circuit 1042 is electrically connected to the power supply terminal of the multimeter control circuit 1013 and the power supply terminal of the range switching circuit 1014. The controlled terminal of the second power consumption switch circuit 1042 is electrically connected to the power control terminal of the main control circuit 102. The input terminal of the second power consumption switch circuit 1042 is used to electrically connect to the second power supply voltage, and the ground terminal of the second power consumption switch circuit 1042 is used for grounding.
[0080] Further optionally, the first power consumption switching circuit 1041 can specifically be Figure 7 The resistor R94 shown is electrically connected at both ends to the power supply terminal of the multimeter control circuit 1013 and to the second power supply voltage, respectively. Alternatively, the second power consumption switch circuit 1042 can be specifically configured as follows: Figure 8 The circuit shown includes a MOSFET Q20, resistors R90 and R64, a transistor Q21, resistors R91 and R92. One end of resistor R91 is electrically connected to the power control terminal of the main control circuit 102. The other end of resistor R91 and one end of resistor R92 are both electrically connected to the base of transistor Q21. The collector of transistor Q21 is electrically connected to both resistors R64 and R90. The other end of resistor R90 is electrically connected to the gate of MOSFET Q20. The drain and source of MOSFET Q20 are respectively electrically connected to the multimeter control circuit 1013. The power supply terminal and the other end of resistor R64 are also used to electrically connect to the second power supply voltage. The first power consumption switch circuit 1041 corresponds to the multimeter control circuit 1013 that needs to be continuously powered, and the second power consumption switch circuit 1042 corresponds to the multimeter control circuit 1013 that needs to be turned on or off. The main control circuit 102 controls the on and off of transistor Q21 and MOSFET Q20, thereby realizing the on and off of multimeter control circuit 1013 and improving the on and off control flexibility of multimeter control circuit 1013.
[0081] As can be seen, this optional embodiment can provide corresponding voltages for different types of multimeter control circuits 1013 through the first power consumption switch circuit 1041 or the second power consumption switch circuit 1042, enriching the circuit's functions and improving its applicability; and by controlling the multimeter control circuit 1013 to be on or off through the second power consumption switch circuit 1042 and the main control circuit 102, the power consumption of the multimeter control circuit 1013 can be saved.
[0082] In another alternative embodiment, the cable detection circuit further includes a power supply circuit 105, wherein, as Figure 9 As shown, the power supply circuit 105 includes a power supply module 1051 and a power management module 1052 electrically connected to the power supply module 1051. Wherein, as... Figure 10 As shown, the power module 1051 includes a first power supply unit 10511, as follows: Figure 11 As shown, the first power supply unit 10511 is used to step down the voltage output from the power management module 1052 to obtain the second supply voltage, wherein:
[0083] The output terminal of the power management module 1052 is electrically connected to the input terminal of the first power unit 10511. The controlled terminal of the power management module 1052 is electrically connected to the power control terminal of the main control circuit 102. The input terminal of the power management module 1052 is used to electrically connect to the energy storage battery. The start terminal of the power management module 1052 is electrically connected to the start terminal of the button circuit 106. Figure 13 As shown, specifically the KEY_ON_OFF of button K1;
[0084] The output terminal of the first power supply unit 10511 is electrically connected to the input terminal of the power consumption switch switching circuit 104 and the input terminal of the main control circuit 102, respectively.
[0085] Optional, such as Figure 10 As shown, the power management module 1052 includes MOSFETs Q1 and Q2, transistors Q3 and Q4, and resistors R5, R6, R7, R8, and R9. The drain of MOSFET Q2 is electrically connected to the input terminal of the first power supply unit 10511. The two ends of resistor R7 are electrically connected to the gate of MOSFET Q2 and the emitter of transistor Q3, respectively. The source of MOSFET Q2 is simultaneously electrically connected to one end of resistor R6, one end of resistor R5, and the source of MOSFET Q1. The base of transistor Q3 is electrically connected to the other end of resistor R5, the collector of transistor Q4 is electrically connected to the other end of resistor R6, the base of transistor Q4 is simultaneously electrically connected to one end of resistor R8 and one end of resistor R9, the other end of resistor R8 is electrically connected to the power control terminal of the main control circuit 102, specifically the MCU_POWER of the main control chip U7, the collector of transistor Q3, the emitter of transistor Q4, and the other end of resistor R9 are all used for grounding, and the base of transistor Q3 is electrically connected to the start terminal of the button circuit 106.
[0086] Optionally, details of the electronic components included in the first power supply unit 10511 and their electrical connections can be found in [reference needed]. Figure 11 .
[0087] Optionally, when button K1 is pressed, transistor Q3 and MOSFET Q2 are turned on. The energy storage battery BAT+ supplies power to the main control circuit 102 through MOSFETs Q1 and Q2 and the first power supply unit 10511, and further supplies power to the multimeter detection circuit 101 through the power consumption switch circuit 104. At this time, button K1 is released. The main control chip U7 of the main control circuit 102 then controls transistor Q4 so that the energy storage battery BAT+ supplies power to the multimeter detection circuit 101 through MOSFETs Q1 and Q2.
[0088] As can be seen, this optional embodiment can power the main control circuit 102 through the button circuit 106, the power management module 1052 and the first power unit 10511, and further power the multimeter by combining the power consumption switch circuit 104. The structure is simple and improves the efficiency and convenience of power supply.
[0089] In yet another alternative embodiment, such as Figure 9 As shown, the power supply circuit 105 also includes a power detection module 1053 electrically connected to the power management module 1052, wherein, as Figure 12 As shown, the input terminal POWER_IN of the power detection module 1053 is electrically connected to the output terminal POWER_IN of the power management module 1052, and the output terminal MCU_BAT_ADC of the power detection module 1053 is electrically connected to the battery control terminal MCU_BAT_ADC of the main control circuit 102.
[0090] The power detection module 1053 is used to electrically connect to the energy storage battery BAT+, and the grounding terminal of the power detection module 1053 is used for grounding.
[0091] Optional, such as Figure 12 As shown, the electronic components (specifically transistor Q5, MOSFET Q6, resistors R10-R16, and capacitor C4) included in the power detection module 1053 and their connections are detailed in [reference needed]. Figure 12 As shown.
[0092] Optionally, details of the electronic components and their electrical connections included in the power detection module 1053 can be found in [link to documentation]. Figure 12 .
[0093] As can be seen, this optional embodiment can control the power supply of the energy storage battery to the multimeter detection circuit 101 and the main control circuit 102 through the power detection module 1053, thereby improving the reliability of power supply control.
[0094] In yet another alternative embodiment, such as Figure 9 As shown, the power supply circuit also includes a charging module 1054 electrically connected to the power management module 1052, wherein, as Figure 10 As shown, the status terminal MCU_BAT_CHRG of the charging module 1054 is electrically connected to the status control terminal MCU_BAT_CHRG of the main control circuit 102. The input terminal of the charging module 1054 is used to electrically connect to the third power supply voltage, and the output terminal of the charging module 1054 is used to electrically connect to the energy storage battery.
[0095] Optionally, details of the electronic components included in the charging module 1054 and their electrical connections can be found in [link to documentation]. Figure 10 .
[0096] As can be seen, this optional embodiment can charge the energy storage battery through the charging module 1054, and simultaneously supply power to the multimeter detection circuit 101 and the main control circuit 102 under the action of devices such as diode D1; and when the energy storage battery is fully charged, the charging circuit of the energy storage battery is disconnected, and the display circuit is controlled by the main control circuit 102 to indicate that the energy storage battery is fully charged, thus enriching the power supply sources of the multimeter detection circuit 101 and the main control circuit 102, and ensuring the power supply sources of the multimeter detection circuit 101 and the main control circuit 102 by charging the energy storage battery.
[0097] In yet another alternative embodiment, such as Figure 13 As shown, the multimeter detection circuit 101 also includes a prompting circuit 1015, wherein the prompting circuit 1015 includes a first resistor R86, a second resistor R87, a third resistor R93, a fifth transistor Q19, and a buzzer BZ1, wherein:
[0098] One end of the third resistor R93 is electrically connected to the prompt control terminal of the main control circuit 102, and the other end of the third resistor R93 is electrically connected to the base of the fifth transistor Q19 and one end of the second resistor R87. The other end of the second resistor R87 is electrically connected to the prompt control terminal of the multimeter control circuit 1013. The collector of the fifth transistor Q19 is electrically connected to one end of the buzzer BZ1, and the other end of the buzzer BZ1 is grounded through the first resistor R86. The emitter of the fifth transistor Q19 is used for grounding.
[0099] Optionally, when a short circuit occurs in the multimeter control circuit 1013, a signal is output to the buzzer BZ1 through the multimeter chip U8, resistor R87, and transistor Q19 to indicate that the multimeter control circuit 1011 is short-circuited; when a button in the button circuit 106 is touched, a signal is output to the buzzer BZ1 through the main control chip U7, resistor R93, and transistor Q19 of the main control circuit 102 to indicate that the button has been touched.
[0100] As can be seen, under the action of the multimeter control circuit 1013 and the main control circuit 102, this optional embodiment provides a prompt through the prompt circuit 1015 to indicate when the multimeter detection circuit 101 is short-circuited or when a button is touched, thus achieving convenience and intuitiveness in the prompt.
[0101] In yet another alternative embodiment, such as Figure 14 As shown, the circuit also includes a transmitting circuit 103, wherein the transmitting circuit 103 includes a signal transmitting circuit 1031, a signal frequency divider circuit 1032, a signal amplification circuit 1033, and a timing control circuit 1034, wherein:
[0102] The input terminal of the signal frequency divider circuit 1032 is electrically connected to the signal terminal of the main control circuit 102, the output terminal of the signal frequency divider circuit 1032 is electrically connected to the input terminal of the signal amplification circuit 1033, the output terminal of the signal amplification circuit 1033 is electrically connected to the signal transmitting circuit 1031, and the output terminal of the signal transmitting circuit 1031 is used for electrical connection of cables.
[0103] The power module 1051 also includes a second power supply unit 10512, wherein:
[0104] The output terminal of the power management module 1052 is electrically connected to the input terminal of the second power supply unit 10512. The output terminal of the second power supply unit 10512 is electrically connected to the voltage input terminal of the signal transmitting circuit 1031, the voltage input terminal of the signal frequency division circuit 1032, and the voltage input terminal of the signal amplification circuit 1033.
[0105] Optionally, the signal frequency divider circuit 1032 includes a first signal frequency divider unit 10321 or a second signal frequency divider unit 10322, wherein:
[0106] like Figure 14 As shown, the first signal frequency division unit 10321 includes a fourth resistor R37, and the second signal frequency division unit 10322 includes a first frequency divider U4-B and a second frequency divider U4-A, wherein:
[0107] One end of the fourth resistor R37 is electrically connected to the signal terminal of the main control circuit 102, and the other end of the fourth resistor R37 is electrically connected to the input terminal of the signal amplifier circuit 1033; one end of the first frequency divider U4-B, MCU_SCAN, is electrically connected to the signal terminal of the main control circuit 102, the output terminal of the first frequency divider U4-B is electrically connected to the input terminal of the second frequency divider U4-A, and the output terminal of the second frequency divider U4-A is electrically connected to the input terminal of the signal amplifier circuit 1033.
[0108] It should be noted that the first signal divider unit 10321 or the second signal divider unit 10322 can be selected according to the driving capability of the main control chip U7. Specifically, when the driving capability of the main control chip U7 is strong, the first signal divider unit 10321 is selected; otherwise, the second signal divider unit 10322 is selected.
[0109] Optionally, the first frequency divider U4-B and the second frequency divider U4-A can be specifically CD4013SA14.TR.
[0110] Optional, such as Figure 14As shown, the signal transmitting circuit 1031 mainly consists of transistors Q8 and Q9, capacitor C20, inductor L5, transformer TR1, and varistor RV1. The emitter of transistor Q8 and the collector of transistor Q9 are electrically connected to transformer TR1 through capacitor C20 and inductor L5. Varistor RV1 is connected in parallel with transformer TR1. The bases of transistors Q8 and Q9 are electrically connected to the output terminal of the signal amplification circuit, specifically the output terminal of amplifier U5-B. This increases the driving force of the bases of transistors Q8 and Q9, thereby improving their conduction capability, and thus improving signal transmission efficiency and line-finding efficiency.
[0111] Optionally, the other electronic components included in the second signal frequency division unit 10322 (specifically R36, capacitor C14, resistor R44, resistor R45, and resistor R46) and their interconnections, the other electronic components included in the signal transmitting circuit 1031 (specifically TVS diode D12, capacitor C50, diodes D4 and D5, inductor L7, capacitor C21, resistor R61, resistor R62, and resistor R63) and their interconnections, and the electronic components included in the signal amplification circuit 1033 (specifically operational amplifiers U5-A and U5-B, capacitors C15 and C16, resistors R47, R48, R49, R50, R51, R52, R53, R56, R57, R58, R59, R60, and control chip U6) and their interconnections, can be found in [reference needed]. Figure 14 As shown. Optionally, the control chip U6 in the signal amplification circuit 1033 can be a CD4066BM.
[0112] Optional, such as Figure 14 As shown, the timing terminals of the timing control circuit 1034 are electrically connected to the timing control terminals of the main control circuit 102, specifically to the output terminals of the main control chip U7, and more specifically to MCU_CONAB, MCU_CONC, and MCU_COND. The output terminals of the timing control circuit 1034 are electrically connected to the timing controlled terminals of the signal amplification circuit 1033, specifically to the input terminals of the control chip U6, specifically CONAB, CONC, and COND. The power supply terminal of the timing control circuit 1034 is electrically connected to the output terminal of the second power supply unit 10512. The main control chip U7 controls the opening and closing of the corresponding channels of the control chip U6 through transistors Q10, Q12, and Q13 to realize the timing of the output signals.
[0113] In this embodiment, the main control chip U7 sends a clock signal to the first frequency divider U4-B and the second frequency divider U4-A for frequency adjustment. Then, the signal is input to the operational amplifiers U5-A and U5-B of the signal amplification circuit for signal amplification. The main control chip U7 controls the timing control circuit 1034 to control the amplitude and timing of the output signal. Then, the push-pull circuit connected by transistors Q8 and Q9 improves the load capacity and the stability of the signal output. Finally, the transformer TR1 isolates the signal from the live cable and outputs the signal to the output probe, ultimately forming a transmit signal with positive and negative polarity, adjustable timing, and adjustable amplitude.
[0114] As can be seen, this optional embodiment can transmit the signal sequentially through the signal frequency division circuit 1032, the signal amplification circuit 1033, the signal transmission circuit 1031, and the timing control circuit 1034 to perform line searching, thereby improving the efficiency and accuracy of line searching.
[0115] Example 2
[0116] This utility model discloses a cable detector, which includes any of the cable detection circuits described in Embodiment 1 for detecting multiple electrical parameters.
[0117] As can be seen, the circuit structure of this utility model embodiment is simple, enabling efficient and accurate cable tracing. It can detect not only the voltage of the cable but also its current and resistance, achieving the functions of a multimeter without the need for one, thus improving the convenience of detecting the voltage, current, and resistance of the cable.
[0118] The cable detector and other related circuit structures described above are merely illustrative. The electronic components described as separate parts may or may not be physically separate, and the components shown as modules may or may not be physical modules; that is, they may be located in one place or distributed across multiple network modules. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.
[0119] Finally, it should be noted that the cable detection circuit and cable detector disclosed in this utility model embodiment for realizing the detection of multiple electrical parameters are only preferred embodiments of this utility model, and are only used to illustrate the technical solutions of this utility model, not to limit it; although this utility model 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; and these 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 various embodiments of this utility model.
Claims
1. A cable detection circuit for implementing detection of a plurality of electrical parameters, the cable detection circuit comprising a multimeter detection circuit (101), a master control circuit (102) and a transmission circuit (103), characterized in that, The communication end of the multimeter detection circuit (101) is electrically connected with the communication end of the main control circuit (102), the input end of the transmitting circuit (103) is electrically connected with the signal end of the main control circuit (102), and the timing end of the transmitting circuit (103) is electrically connected with the timing control end of the main control circuit (102). The input end of the multimeter detection circuit (101) is used for electrically connecting a cable, and the output end of the transmitting circuit (103) is used for electrically connecting the cable.
2. The cable probe circuit for enabling detection of multiple electrical parameters as claimed in claim 1 wherein, The multimeter detection circuit (101) comprises a current detection circuit (1011), a voltage resistance detection circuit (1012), a multimeter control circuit (1013) and a gear switching circuit (1014). The output end of the current detection circuit (1011) is electrically connected with the first acquisition end of the multimeter control circuit (1013), the common end of the current detection circuit (1011) is electrically connected with the common end of the multimeter control circuit (1013), the selection end of the current detection circuit (1011) is electrically connected with the first selection end of the gear switching circuit (1014), and the input end of the current detection circuit (1011) is used for electrically connecting the cable. The output end of the voltage resistance detection circuit (1012) is electrically connected with the second acquisition end of the multimeter control circuit (1013), the selection end of the voltage resistance detection circuit (1012) is electrically connected with the second selection end of the gear switching circuit (1014), and the input end of the voltage resistance detection circuit (1012) is used for electrically connecting the cable. The data end of the gear switching circuit (1014) is electrically connected with the data end of the multimeter control circuit (1013). The communication end of the multimeter control circuit (1013) is electrically connected with the communication end of the main control circuit (102).
3. The cable probe circuit for enabling detection of multiple electrical parameters as claimed in claim 2 wherein, The gear switching circuit (1014) comprises a first triode (Q15), a second triode (Q16), a third triode (Q17), a fourth triode (Q18) and a relay (RLY1). The collector of the first triode (Q15) and the collector of the second triode (Q16) are electrically connected with the first end of the relay (RLY1), and the collector of the third triode (Q17) and the collector of the fourth triode (Q18) are electrically connected with the second end of the relay (RLY1). The base of the first triode (Q15), the base of the second triode (Q16), the base of the third triode (Q17) and the base of the fourth triode (Q18) are all electrically connected with the data end of the multimeter control circuit (1013). The emitter of the first triode (Q15) and the emitter of the third triode (Q17) are used for connecting a power supply module, and the emitter of the second triode (Q16) and the emitter of the fourth triode (Q18) are used for grounding.
4. The cable probe circuit for enabling detection of multiple electrical parameters according to claim 2 or 3, wherein, The cable detection circuit further comprises a power consumption switch switching circuit (104). The power consumption switch switching circuit (104) includes a first power consumption switch circuit (1041) or a second power consumption switch switching circuit (1042), wherein: The output end of the first power consumption switch circuit (1041) is electrically connected to the power supply end of the multimeter control circuit (1013) and the power supply end of the gear switching circuit (1014); The output end of the second power consumption switch circuit (1042) is electrically connected to the power supply end of the multimeter control circuit (1013) and the power supply end of the gear switching circuit (1014), and the controlled end of the second power consumption switch circuit (1042) is electrically connected to the power supply control end of the main control circuit (102).
5. The cable probe circuit for enabling detection of multiple electrical parameters as claimed in claim 4 wherein, The cable detection circuit further includes a power supply circuit (105), wherein the power supply circuit (105) includes a power supply module (1051) and a power management module (1052), wherein the power supply module (1051) includes a first power supply unit (10511), wherein: The output end of the power management module (1052) is electrically connected to the input end of the first power supply unit (10511), the controlled end of the power management module (1052) is electrically connected to the power supply control end of the main control circuit (102), and the input end of the power management module (1052) is used for electrically connecting the energy storage battery; The output end of the first power supply unit (10511) is respectively electrically connected to the input end of the power consumption switch switching circuit (104) and the input end of the main control circuit (102).
6. The cable probe circuit for enabling detection of multiple electrical parameters as claimed in claim 5 wherein, The power supply circuit (105) further includes a power supply detection module (1053), wherein: The input end of the power supply detection module (1053) is electrically connected to the output end of the power management module (1052), and the output end of the power supply detection module (1053) is electrically connected to the battery control end of the main control circuit (102); The power supply detection module (1053) is used for electrically connecting the energy storage battery; The power supply circuit (105) further includes a charging module (1054), wherein: The state end of the charging module (1054) is electrically connected to the state control end of the main control circuit (102), and the output end of the charging module (1054) is used for electrically connecting the energy storage battery.
7. The cable probe circuit for enabling detection of a plurality of electrical parameters according to any one of claims 2-6, wherein, The multimeter detection circuit (101) further includes a prompt circuit (1015), wherein the prompt circuit (1015) includes a first resistor (R86), a second resistor (R87), a third resistor (R93), a fifth triode (Q19), and a buzzer (BZ1), wherein: One end of the third resistor (R93) is electrically connected to the prompt control end of the master control circuit (102), the other end of the third resistor (R93) is electrically connected to the base of the fifth transistor (Q19) and one end of the second resistor (R87), the other end of the second resistor (R87) is electrically connected to the prompt control end of the universal table control circuit (1013), the collector of the fifth transistor (Q19) is electrically connected to one end of the buzzer (BZ1), the other end of the buzzer (BZ1) is grounded through the first resistor (R86), and the emitter of the fifth transistor (Q19) is grounded.
8. The cable probe circuit for enabling detection of a plurality of electrical parameters according to any one of claims 1-6, wherein, The transmitting circuit (103) comprises a signal transmitting circuit (1031), a signal frequency dividing circuit (1032), a signal amplifying circuit (1033) and a timing control circuit (1034), wherein: The input end of the signal frequency dividing circuit (1032) is electrically connected to the signal end of the master control circuit (102), the output end of the signal frequency dividing circuit (1032) is electrically connected to the input end of the signal amplifying circuit (1033), the output end of the signal amplifying circuit (1033) is electrically connected to the signal transmitting circuit (1031), and the output end of the signal transmitting circuit (1031) is used for electrically connecting the cable; The timing end of the timing control circuit (1034) is electrically connected to the timing control end of the master control circuit (102), and the output end of the timing control circuit (1034) is electrically connected to the timing controlled end of the signal amplifying circuit (1033). The power supply module (1051) further comprises a second power supply unit (10512), wherein: The output end of the power management module (1052) is electrically connected to the input end of the second power supply unit (10512), the output end of the second power supply unit (10512) is electrically connected to the voltage input end of the signal transmitting circuit (1031), the voltage input end of the signal frequency dividing circuit (1032), the voltage input end of the signal amplifying circuit (1033) and the power supply end of the timing control circuit (1034).
9. The cable probe circuit for enabling detection of multiple electrical parameters as claimed in claim 8 wherein, The signal frequency dividing circuit (1032) comprises a first signal frequency dividing unit (10321) or a second signal frequency dividing unit (10322), wherein: The first signal frequency dividing unit (10321) comprises a fourth resistor (R37), and the second signal frequency dividing unit (10322) comprises a first frequency divider (U4-B) and a second frequency divider (U4-A), wherein: One end of the fourth resistor (R37) is electrically connected to the signal end of the master control circuit (102), and the other end of the fourth resistor (R37) is electrically connected to the input end of the signal amplifying circuit (1033); One end of the first frequency divider (U4-B) is electrically connected to the signal end of the master control circuit (102), the output end of the first frequency divider (U4-B) is electrically connected to the input end of the second frequency divider (U4-A), and the output end of the second frequency divider (U4-A) is electrically connected to the input end of the signal amplifying circuit (1033).
10. A cable probe, characterized in that, The cable detector comprises the cable detection circuit for implementing detection of multiple electrical parameters as claimed in any one of claims 1-9.