CN113341344B - Circuit on-off detection device - Google Patents
Circuit on-off detection device Download PDFInfo
- Publication number
- CN113341344B CN113341344B CN202110511778.9A CN202110511778A CN113341344B CN 113341344 B CN113341344 B CN 113341344B CN 202110511778 A CN202110511778 A CN 202110511778A CN 113341344 B CN113341344 B CN 113341344B
- Authority
- CN
- China
- Prior art keywords
- resistor
- voltage
- unit
- operational amplifier
- line
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/54—Testing for continuity
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/58—Testing of lines, cables or conductors
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The application discloses circuit on-off detection device, it includes: the detection unit is used for detecting the line to be detected so as to output a detection result; a voltage supply unit for supplying a first voltage and a second voltage; the comparison unit is used for generating a first output signal according to the received first voltage and the second voltage, generating a corresponding feedback voltage according to the first output signal and the detection result, comparing the feedback voltage with the second voltage and further generating a corresponding second output signal; and the prompting unit is used for generating corresponding indication information according to the first output signal or the second output signal so as to indicate that the line to be detected is a closed circuit or an open circuit. This application circuit break-make detection device can effectively detect out the wire rod because of the produced unusual problem of contact failure to reduce electronic equipment's rework rate, and improve and produce line efficiency.
Description
Technical Field
The application relates to the technical field of electronic circuits, in particular to a line on-off detection device.
Background
Some electronic equipment (for example, a television) manufacturer finds abnormal problems of plug wire type wires through data statistics, which may easily cause a high rework rate of the whole machine, and among the abnormal problems of plug wire type wires, the problem that an IR wire (infrared remote control receiving wire) is easily loosened is particularly prominent. The electronic equipment manufacturer conducts further investigation on the reworked electronic equipment due to the fact that the infrared remote controller keys are not functional, and finds that the IR line is not completely installed in the machining process of the infrared remote controller, and the adhesive paper pasted on the surface of the IR line enables the IR line to be difficult to adjust, so that the IR line installed in the infrared remote controller shell can be loosened, contact between the IR line and the IR main board is poor, and the infrared remote controller keys are not functional. In addition, there is no effective detection process to detect the loosening of the IR line in a timely manner.
At present, products for detecting the connecting lines are not available in the market, so that the connecting conditions of the connecting lines cannot be accurately known in production test. Moreover, there is not an adaptation standard between socket and the wire rod, and the socket probably appears the not hard up condition because of reasons such as vibrations, atress friction when the adaptation with the wire rod, if do not detect in time, then probably make external module (for example button, WIFI module, power amplifier module etc.) do not have the effect and produce abnormal conditions.
In addition, in the circuit on-off detection device that is common in the existing market, current-limiting resistor can be established ties in general to its circuit, and this current-limiting resistor is in operating condition always, causes this current-limiting resistor's consumption great for circuit on-off detection device generates heat seriously at the operation in-process, so that need adopt the great resistance of volume, causes circuit on-off detection device's life-span short like this easily, and fragile, and maintenance cost is higher, uses and experiences not good scheduling problem. Furthermore, this type of on/off detection circuit is not suitable for the television products described above.
In view of the above, designing a wire breakage detecting device to detect the abnormal problem of the wire is an important research topic for relevant researchers.
Disclosure of Invention
The embodiment of the application provides a line on-off detection device, which can effectively detect the abnormal problem of a line caused by poor contact, thereby reducing the rework rate of electronic equipment and improving the production line efficiency. Moreover, this application circuit break-make detection device is a succinct efficient analysis tool.
According to an aspect of the present application, there is provided a line on-off detection apparatus, including: the detection unit is used for detecting the line to be detected so as to output a detection result; a voltage supply unit for supplying a first voltage and a second voltage; the comparison unit is used for generating a first output signal according to the received first voltage and the second voltage, generating a corresponding feedback voltage according to the first output signal and the detection result, comparing the feedback voltage with the second voltage and further generating a corresponding second output signal; and the prompting unit is used for generating corresponding indication information according to the first output signal or the second output signal so as to indicate that the line to be detected is a closed circuit or an open circuit.
Optionally, the detection unit includes two interfaces, and the two interfaces are electrically connected to two ends of the to-be-detected line, respectively.
Optionally, the voltage supply unit includes a first resistor, a second resistor, a third resistor, and a fourth resistor; one end of the first resistor is connected with a power supply end, the other end of the first resistor is connected with one end of the second resistor, and the other end of the second resistor is grounded; one end of the third resistor is connected with a power supply end, and the other end of the third resistor is connected with one end of the fourth resistor; the other end of the fourth resistor is grounded.
Optionally, the voltage supply unit further includes a first diode, an anode of the first diode is connected to a power supply terminal, and a cathode of the first diode is connected to the one end of the first resistor.
Optionally, the comparison unit includes an operational amplifier, a first input end of the operational amplifier is connected to the other end of the first resistor and one end of the second resistor of the voltage supply unit and the output end of the detection unit, a second input end of the operational amplifier is connected to the other end of the third resistor and one end of the fourth resistor of the voltage supply unit, and an output end of the operational amplifier is connected to the input end of the prompt unit and the input end of the detection unit.
Optionally, the prompting unit includes a light emitting diode, an anode of the light emitting diode is connected to the output end of the comparing unit, and a cathode of the light emitting diode is grounded.
Optionally, the line on-off detection device further includes a current limiting unit, where the current limiting unit includes a fifth resistor and a sixth resistor; one end of the fifth resistor is connected with the input end of the detection unit, and the other end of the fifth resistor is respectively connected with one end of the sixth resistor and the output end of the comparison unit; one end of the sixth resistor is connected with the output end of the comparison unit, and the other end of the sixth resistor is connected with the anode of the light emitting diode of the prompt unit.
Optionally, the line on-off detection device further includes a reset unit, the reset unit includes a reset switch, the reset unit is configured to provide the first voltage and the second voltage to the voltage supply unit when the reset switch is turned on, and provide the second voltage to the voltage supply unit when the reset switch is turned off.
Optionally, the line on-off detection device further includes a voltage stabilizing unit, where the voltage stabilizing unit includes a first capacitor, a second capacitor, and a third capacitor, the first capacitor and the second capacitor are respectively connected in parallel to the second resistor of the voltage supply unit, and the third capacitor is connected in parallel to the fourth resistor of the voltage supply unit.
Optionally, the line on-off detection device further includes a protection unit, the protection unit is used for preventing static electricity, the protection unit includes a first voltage regulator diode and a second voltage regulator diode, a cathode of the first voltage regulator diode is connected to the output end of the detection unit, the first input end of the comparison unit and the output end of the voltage supply unit, an anode of the first voltage regulator diode is connected to an anode of the second voltage regulator diode, and a cathode of the second voltage regulator diode is grounded.
The embodiment of the application provides a circuit on-off detection device, when the contact failure between wire rod and the socket produces the action of falling the electricity, through circuit on-off detection device's detecting element detects this action of falling the electricity to the cooperation comparing element is in order to produce corresponding output signal, and send this output signal to emitting diode, with the corresponding prompt information of output, thereby can arrange the wire rod fast because of the produced abnormal problem of contact failure, and then can reduce electronic equipment's rework rate, can improve the efficiency of producing the line moreover. In addition, this application the circuit break-make detection device is a succinct efficient analysis tool.
Drawings
The technical solution and other advantages of the present application will become apparent from the detailed description of the embodiments of the present application with reference to the accompanying drawings.
Fig. 1 is a schematic diagram of a framework of a circuit disconnection detecting apparatus according to an embodiment of the present application.
Fig. 2 is a schematic circuit connection diagram of the line on-off detection device according to the embodiment of the present application.
Fig. 3 is a schematic structural diagram of the line on-off detection device provided in the embodiment of the present application.
Fig. 4 is a schematic view of an operating principle of the line on-off detection device provided in the embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms "first", "second" and "first" are used herein for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
The following disclosure provides many different embodiments or examples for implementing different features of the application. In order to simplify the disclosure of the present application, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present application. Further, the present application may repeat reference numerals and/or reference letters in the various examples for simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or arrangements discussed.
Fig. 1 is a schematic diagram of a framework of a circuit disconnection detecting apparatus according to an embodiment of the present application. Fig. 2 is a schematic circuit connection diagram of the line on-off detection device according to the embodiment of the present application. Fig. 3 is a schematic view of an operating principle of the line on-off detection device provided in the embodiment of the present application. Fig. 4 is a schematic view of an operating principle of the line on-off detection device provided in the embodiment of the present application.
Referring to fig. 1 to 4, a circuit on/off detection apparatus 1000 is provided in the embodiment of the present application. The line on-off detection device 1000 includes: a detection unit 110 for detecting a line to be detected (not shown) to output a detection result; a voltage supply unit 120 for supplying a first voltage and a second voltage; a comparing unit 130 for generating a first output signal according to the received first voltage and second voltage, generating a corresponding feedback voltage according to the first output signal and the detection result, and comparing the feedback voltage with the second voltage to generate a corresponding second output signal; and the prompting unit 140 is configured to generate corresponding indication information according to the first output signal or the second output signal, so as to indicate that the line to be detected is a closed circuit or an open circuit.
When the action falls to the production power failure of contact failure between wire rod and the socket, this application circuit break-make detection device 1000 detects this action of falling to the cooperation comparing element is in order to produce corresponding output signal, and send this output signal to emitting diode, with the corresponding prompt message of output, thereby can arrange the wire rod fast and because of the produced abnormal problem of contact failure, and then can reduce electronic equipment's rework rate, can improve the efficiency of producing the line moreover.
Specifically, the detection unit 110 includes two interfaces, and the two interfaces are electrically connected to two ends of the line to be detected respectively. In some embodiments, the detection unit 110 may also include a socket connected to the line to be detected, where the socket may be a standard socket 111 or an expansion socket 112, and the socket has two port interfaces, so that the two port interfaces are electrically connected to two ends of the line to be detected, respectively, so as to be able to detect whether the connection between the line to be detected and the socket is normal, that is, whether the contact between the line to be detected and the socket is good.
The voltage supply unit 120 includes a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4. One end of the first resistor R1 is connected to a power supply terminal (+ 5V), the other end of the first resistor R1 is connected to one end of the second resistor R2, and the other end of the second resistor R2 is grounded GND. One end of the third resistor R3 is connected to a power supply terminal (+ 5V), and the other end of the third resistor R3 is connected to one end of the fourth resistor R4. The other end of the fourth resistor R4 is grounded GND. The voltage supply unit 120 provides a required voltage to the comparison unit 130 based on a voltage division principle of a series circuit. The first resistor R1 and the second resistor R2 are connected in series. The third resistor R3 and the fourth resistor R4 are connected in series. In this embodiment, the voltage supply unit 120 may further include a USB interface (such as reference numeral 121 shown in fig. 3) for receiving power supplied by an external power source to output a preset voltage. For example, the preset voltage is 5V, that is, the voltage of the power source terminal of the on-off line detection apparatus 1000 is 5V.
In some embodiments, the voltage supply unit 120 further includes a first diode D1, an anode of the first diode D1 is connected to a power source terminal, and a cathode of the first diode D1 is connected to the one end of the first resistor R1. The diode is arranged to be designed to prevent voltage backflow, so that crosstalk is prevented from enabling the single circuit to be not activated.
The comparing unit 130 includes an operational amplifier OPA1. The first input end of the operational amplifier OPA1 is respectively connected to the other end of the first resistor R1 and one end of the second resistor R2 of the voltage supply unit 120 and the output end of the detection unit 110, the second input end of the operational amplifier OPA1 is respectively connected to the other end of the third resistor R3 and one end of the fourth resistor R4 of the voltage supply unit 120, and the output end of the operational amplifier OPA1 is respectively connected to the input end of the prompt unit 140 and the input end of the detection unit 110. Specifically, the operational amplifier OPA1 may employ an LM358P dual operational amplifier, which includes two high-gain, independent internal frequency compensated dual op amps. Of course, in other embodiments, other types of operational amplifiers may be used. In this embodiment, the operational amplifier OPA1 has a positive feedback characteristic, and when a high level is input to the first input terminal (i.e., the positive input terminal) of the operational amplifier OPA1, the output terminal of the operational amplifier OPA1 outputs the high level. If the first input terminal (i.e., the positive input terminal) of the operational amplifier OPA1 inputs a low level, the output terminal of the operational amplifier OPA1 outputs a low level. If the first input terminal (i.e. the positive input terminal) of the operational amplifier OPA1 inputs a low level when the port interfaces are disconnected, the output terminal of the operational amplifier OPA1 also outputs a low level. At this time, even if the path is restored between the port interfaces, the first input terminal (i.e., the positive input terminal) of the operational amplifier OPA1 still inputs a low level, and thus the output terminal of the operational amplifier OPA1 also outputs a low level. The circuit in the above case may be referred to as a self-locking circuit. In addition, by utilizing the positive feedback characteristic of the operational amplifier OPA1, the power failure action (even a tiny action) can be captured, the tiny action can be amplified, and a corresponding level is output to the indicating unit, so that the abnormal problem of the wire rod caused by poor contact can be rapidly found out, the rework rate of the electronic equipment can be reduced, and the efficiency of a production line can be improved.
The prompting unit 140 includes a light emitting diode D2, i.e., an LED lamp, an anode of the light emitting diode D2 is connected to the output end of the comparing unit 130, and a cathode of the light emitting diode D2 is grounded GND. The led D2 may obtain corresponding indication information according to the output signal (e.g. the first output signal and the second output signal described above) generated by the operational amplifier OPA1, and the indication information may be turned on or off by the led D2 to indicate that the line to be detected is open or closed.
In this embodiment, the circuit on-off detection device 1000 further includes a current limiting unit 150, where the current limiting unit 150 includes a fifth resistor R5 and a sixth resistor R6; one end of the fifth resistor R5 is connected to the input end of the detection unit 110, and the other end of the fifth resistor R5 is connected to one end of the sixth resistor R6 and the output end of the comparison unit, respectively; one end of the sixth resistor R6 is connected to the output end of the comparing unit, and the other end of the sixth resistor R6 is connected to the anode of the light emitting diode D2 of the prompting unit 140. The current limiting unit 150 is used to limit the current on the line to within the electrical specification of the component. For example, the fifth resistor R5 may limit the current within the electrical specification of the operational amplifier OPA1, and the sixth resistor R6 may limit the current within the electrical specification of the light emitting diode D2, thereby preventing these components from being burned out due to excessive current.
The on-off line detection device 1000 further comprises a reset unit 170, and the reset unit 170 comprises a reset switch K1. The reset unit 170 is configured to provide the first voltage and the second voltage for the voltage supply unit 120 when the reset switch K1 is turned on, and provide the second voltage for the voltage supply unit 120 when the reset switch K1 is turned off. That is to say, the reset unit 170 is configured to restore the whole circuit to the initial state when performing power-on reset on the line break detection apparatus 1000 each time, so as to ensure the sensitivity of the line break detection apparatus 1000, perform a fool-proof function, and ensure the stability of the device.
The apparatus further includes a voltage stabilizing unit 180, where the voltage stabilizing unit 180 includes a first capacitor C1, a second capacitor C2, and a third capacitor C3, the first capacitor C1 and the second capacitor C2 are respectively connected in parallel to the second resistor R2 of the voltage supplying unit 120, and the third capacitor C3 is connected in parallel to the fourth resistor R4 of the voltage supplying unit 120. Because the first capacitor C1, the second capacitor C2, and the third capacitor C3 of the voltage stabilizing unit 180 have a characteristic that the capacitor voltage cannot change suddenly, the voltage supplying unit 120 does not supply power to the operational amplifier OPA1 of the comparing unit first, but charges the first capacitor C1, the second capacitor C2, and the third capacitor C3 first, so that the power-on time of the operational amplifier OPA1 is changed from nanosecond to millisecond, and the purpose is to protect the operational amplifier OPA1 from being impacted by rapid power-on, thereby prolonging the service life of the operational amplifier OPA1.
With reference to fig. 1 and fig. 2, the on-off line detection apparatus 1000 further includes a protection unit 190, the protection unit 190 includes a first zener diode D3 and a second zener diode D4, a cathode of the first zener diode D3 is respectively connected to the output terminal of the detection unit 110, the first input terminal of the comparison unit 130, and the output terminal of the voltage supply unit 120, an anode of the first zener diode D3 is connected to an anode of the second zener diode D4, and a cathode of the second zener diode D4 is grounded. The protection unit 190 is used to prevent static electricity that may be generated when an operator touches (or touches) a circuit board of the on-off line detection apparatus 1000 or hot plugs a wire from a port interface of a socket, so that damage to a chip caused by the static electricity can be prevented, and reliability can be improved.
The working principle of the circuit breaking detection device 1000 will be further described below with reference to fig. 2 to 4.
In this embodiment, the on-off line detection apparatus 1000 may include a circuit board 200, and a detection unit 110, a voltage supply unit 120, a comparison unit 130, a prompt unit 140, a current limiting unit 150, a reset unit 170, a voltage regulation unit 180, a protection unit 190, and other functional units disposed on the circuit board 200. A plurality of sockets including a standard socket 111 and an expansion socket 112 may also be disposed on the circuit board 200, as shown in fig. 1. The standard socket 111 and the expansion socket 112 each have a port interface for connecting a line to be detected. The sockets all support hot plug functions.
When the reset switch K1 of the reset unit 170 is closed, that is, the entire circuit of the line break detecting device 1000 is reset, the voltage supply unit may supply the first voltage and the second voltage to the first input terminal and the second input terminal of the comparison unit 130, respectively. The first voltage may be obtained according to a power supply voltage and a resistance ratio of the first resistor R1 and the second resistor R2 connected in series. The second voltage may be obtained according to the power supply voltage and the resistance ratio of the third resistor R3 and the fourth resistor R4 connected in series. Specifically, in the present embodiment, the voltage of the power source terminal may be, for example, 5V, the resistance of the first resistor R1 is 2K, the resistance of the second resistor R2 is 2K, and the first voltage is 2.5V, that is, the voltage of the first input terminal of the operational amplifier OPA1 is 2.5V. Similarly, if the third resistor R3 has a resistance of 2K and the fourth resistor R4 has a resistance of 1.1K, the second voltage is about 1.6V, i.e., the voltage at the second input terminal of the OPA1 is 1.6V, and the second voltage can be used as the reference voltage.
When the voltage at the first input terminal of the operational amplifier OPA1 is 2.5V and the voltage at the second input terminal is 1.6V, the voltage of the first output signal generated by the output terminal of the operational amplifier OPA1 is 3.5V. Since the voltage of the first output signal is at a high level, the indication information of the indication unit is 1, and the indication information is 1 according to the preset lighting rule, which indicates that the light emitting diode D2 is turned on. Note that the indication information may be 1 or 0. When the instruction information is 1, it indicates that the light emitting diode D2 is on, and when the instruction information is 0, it indicates that the light emitting diode D2 is off. Of course, in other embodiments, the preset lighting rule may be as follows: the instruction information is 1, indicating that the light emitting diode D2 is off, and the instruction information is 0, indicating that the light emitting diode D2 is on.
When the reset switch K1 of the reset unit 170 is turned off, the voltage supply unit 120 supplies only the second voltage to the second input terminal of the comparison unit. The second voltage may be obtained according to the power supply voltage and a resistance ratio of the third resistor R3 and the fourth resistor R4 connected in series. Specifically, in this embodiment, the voltage of the power source terminal may be, for example, 5V, the resistance of the third resistor R3 is 2K, the resistance of the fourth resistor R4 is 1.1K, and the second voltage is about 1.6V, that is, the voltage of the second input terminal of the operational amplifier OPA1 is 1.6V, which may be used as the reference voltage.
At this time, the line to be detected is connected to two port interfaces of the detection unit 110. It should be noted that, when the line to be detected is correctly connected to the two port interfaces of the detection unit 110, a path is formed between the two port interfaces, that is, the line to be detected is a path, in other words, the detection result generated by the detection unit 110 is 1. When the line to be detected is incorrectly connected to the two port interfaces of the detection unit 110 or the line to be detected is in poor contact with the two port interfaces of the detection unit 110, an open circuit is formed between the two port interfaces, which means that the line to be detected is open circuit, in other words, the detection result generated by the detection unit 110 is 0.
When the reset switch K1 of the reset unit 170 is turned off and the detection result is 1, the first output signal generated by the output terminal of the operational amplifier OPA1 is fed back to the first input terminal of the operational amplifier OPA1 through the input terminal and the output terminal of the detection unit 110, and the feedback voltage is generated. Specifically, in the present embodiment, the first output signal (in the present embodiment, the voltage of the first output signal is 3.5V) generated at the output terminal of the operational amplifier OPA1 is transmitted to the input terminal of the detection unit 110 through the fifth resistor R5, and then transmitted to the first input terminal of the operational amplifier OPA1 through the output terminal of the detection unit 110, and the feedback voltage is generated. Since the resistance of the fifth resistor R5 is 1K and the resistance of the second resistor R2 is 2K, the voltage (i.e. the feedback voltage) at the first input terminal of the operational amplifier OPA1 is about 2.15V at this time. Since the voltage (i.e. the feedback voltage) at the first input terminal of the operational amplifier OPA1 is larger than the voltage (i.e. the reference voltage) at the second input terminal, the second output signal generated at the output terminal of the operational amplifier OPA1 is still high. According to the above-mentioned light-emitting rule, if the indication information obtained by the indication unit is 1, the light-emitting diode D2 is turned on.
When the reset switch K1 of the reset unit 170 is turned off and the line to be detected and the two port interfaces are in poor contact, a broken circuit is formed between the two port interfaces, that is, the line to be detected is broken, so the detection result of the detection unit 110 is 0, and at this time, the first input end of the operational amplifier OPA1 is connected to the ground through the second resistor R2, and therefore, the first input end of the operational amplifier OPA1 receives a low-level signal. However, since the second resistor R2 is connected in parallel to the first capacitor C1 and the second capacitor C2, according to the characteristic that the capacitor voltage cannot change abruptly, the voltage at the first input terminal of the operational amplifier OPA1 is gradually decreased from 2.15V, and when the voltage is decreased to 1.6V, i.e., equal to the voltage (reference voltage) at the second input terminal of the operational amplifier OPA1, the second output signal generated at the output terminal of the operational amplifier OPA1 is changed from 3.5V to 0V, i.e., the second output signal of the operational amplifier OPA1 is at a low level. According to the above-mentioned light-emitting rule, if the indication information obtained by the indication unit is 0, the light-emitting diode D2 is turned off.
It should be noted that the poor contact between the line to be detected and the two port interfaces may be caused by the socket or the wire being subjected to vibration, force and friction, and the like. Specifically, for example, a force horizontal to the direction of the wire may be applied to the wire to detect whether the wire is separated from the socket, thereby ensuring good contact between the wire and the socket. The force may be 2 newtons, but is not limited thereto. In addition, the power consumption of the fifth resistor R5 is 0.001W, the power consumption of the sixth resistor R6 is 0.002W, and the power consumption is very low, and once the line to be detected is disconnected, the voltage of the second output signal output by the output terminal of the operational amplifier OPA1 may be 0V, that is, no current flows through the fifth resistor R5 and the sixth resistor R6, so that the power consumption of the both is zero.
When the reset switch K1 of the reset unit 170 is turned off and the line to be detected is restored to be in normal contact with the two port interfaces, due to poor contact between the line to be detected and the two port interfaces, the second output signal output by the output end of the operational amplifier OPA1 is a low level signal, at this time, the voltage of the second output signal output by the output end of the operational amplifier OPA1 fed back to the first input end of the operational amplifier OPA1 through the fifth resistor R5 is still a low level signal, that is, the working principle of the operational amplifier OPA1 with the positive feedback characteristic is met. If the subsequent line to be detected is in poor contact with the two port interfaces again, the second output signal output by the output terminal of the operational amplifier OPA1 is still at a low level, which may be referred to as self-locking. The first output signal output from the output terminal of the operational amplifier OPA1 is high, i.e., the output 3.5V is restored, unless when the reset switch K1 of the reset unit 170 is closed.
As described above, when the reset switch K1 of the reset unit 170 is turned off and there is a poor contact between the line to be detected and the port interface, the voltage at the first input terminal of the operational amplifier OPA1 is gradually decreased from 2.15V until the voltage of the second output signal outputted from the output terminal of the operational amplifier OPA1 is changed from 3.5V to 0V, which is different from the first output signal by about 50ms. Therefore, even if the time for the line to be detected to be broken is short, for example, 50ms, the line on-off detection device 1000 according to the present application can still cooperate with the detection unit 110, the comparison unit 130, the voltage stabilization unit 180, the prompt unit 140, and the like to detect the abnormal condition of the line to be detected. In addition, when the abnormal condition of the line to be detected is detected, and the second output signal output by the output end of the operational amplifier OPA1 is always kept at the low level since the second output signal is changed into the low level until the reset switch K1 of the reset unit 170 is closed, the design makes the indicating effect (turning off or on) of the light emitting diode D2 of the indicating unit obvious, and an operator can determine the line to be the open circuit or the broken circuit in time.
The embodiment of the application provides a circuit on-off detection device 1000, when the contact failure between wire rod and the socket produces the action of falling electric, through detection unit 110 of circuit on-off detection device 1000 detects this action of falling electric to the cooperation comparing element is in order to produce corresponding output signal, and send this output signal to emitting diode D2, with corresponding prompt information of output, thereby can arrange the wire rod fast because of the produced abnormal problem of contact failure, and then can reduce electronic equipment's rework rate, and can improve the efficiency of producing the line. In addition, this application the circuit break-make detection device 1000 is a succinct efficient analytical tool.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
The circuit on-off detection device provided by the embodiment of the present application is described in detail above, a specific example is applied in the description to explain the principle and the implementation of the present application, and the description of the embodiment is only used to help understand the technical scheme and the core idea of the present application; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present disclosure as defined by the appended claims.
Claims (9)
1. A circuit on-off detection device, characterized by comprising:
the detection unit is used for detecting the line to be detected so as to output a detection result;
a voltage supply unit for supplying a first voltage and a second voltage;
the comparison unit is used for generating a first output signal according to the received first voltage and the received second voltage, generating a corresponding feedback voltage according to the first output signal and the detection result, comparing the feedback voltage with the second voltage and further generating a corresponding second output signal, wherein the comparison unit comprises an operational amplifier, the voltage supply unit is used for respectively providing the first voltage and the second voltage to a first input end and a second input end of the operational amplifier, and the output end of the operational amplifier is connected with the first input end through the detection unit; and
the reset unit comprises a reset switch, the reset unit is used for providing the first voltage and the second voltage when the reset switch is closed, and the voltage supply unit provides the second voltage when the reset switch is opened;
when the reset switch is turned off and the detection circuit is turned on, the operational amplifier inputs a level higher than the second voltage to the first input end through the detection unit, and the second output signal output by the operational amplifier is at a high level;
when the reset switch is turned off and the detection circuit is in an open circuit state, the level of the first input end is lower than the second voltage, and the second output signal output by the operational amplifier is in a low level;
when the reset switch is turned off and the detection circuit is restored to a path from the open circuit, the operational amplifier inputs a low level to the first input end through the detection unit, and the second output signal output by the operational amplifier continues to be the low level;
and the prompting unit is used for generating corresponding indication information according to the first output signal or the second output signal so as to indicate that the line to be detected is a closed circuit or an open circuit.
2. The on-off line detection device according to claim 1, wherein the detection unit comprises two interfaces, and the two interfaces are electrically connected to two ends of the line to be detected respectively.
3. The on-off line detection device according to claim 1, wherein the voltage supply unit comprises a first resistor, a second resistor, a third resistor and a fourth resistor; one end of the first resistor is connected with a power supply end, the other end of the first resistor is connected with one end of the second resistor, and the other end of the second resistor is grounded; one end of the third resistor is connected with a power supply end, and the other end of the third resistor is connected with one end of the fourth resistor; the other end of the fourth resistor is grounded.
4. The on-off line detection device according to claim 3, wherein said voltage supply unit further comprises a first diode, an anode of said first diode being connected to a power source terminal, and a cathode of said first diode being connected to said one end of said first resistor.
5. The on-off line detection device according to claim 1, wherein a first input terminal of the operational amplifier is connected to the other end of the first resistor and one end of the second resistor of the voltage supply unit and an output terminal of the detection unit, respectively, a second input terminal of the operational amplifier is connected to the other end of the third resistor and one end of the fourth resistor of the voltage supply unit, respectively, and an output terminal of the operational amplifier is connected to the input terminal of the prompt unit and the input terminal of the detection unit, respectively.
6. The on-off line detection device according to claim 1, wherein the prompting unit comprises a light emitting diode, an anode of the light emitting diode is connected with the output end of the comparing unit, and a cathode of the light emitting diode is grounded.
7. The on-off line detection device according to claim 1, further comprising a current limiting unit including a fifth resistor and a sixth resistor; one end of the fifth resistor is connected with the input end of the detection unit, and the other end of the fifth resistor is respectively connected with one end of the sixth resistor and the output end of the comparison unit; one end of the sixth resistor is connected with the output end of the comparison unit, and the other end of the sixth resistor is connected with the anode of the light emitting diode of the prompt unit.
8. The on-off line detection device according to claim 1, further comprising a voltage stabilizing unit, wherein the voltage stabilizing unit comprises a first capacitor, a second capacitor and a third capacitor, the first capacitor and the second capacitor are respectively connected in parallel to the second resistor of the voltage supply unit, and the third capacitor is connected in parallel to the fourth resistor of the voltage supply unit.
9. The on-off line detection device according to claim 1, further comprising a protection unit, wherein the protection unit is configured to prevent static electricity, the protection unit comprises a first zener diode and a second zener diode, a cathode of the first zener diode is connected to the output terminal of the detection unit, the first input terminal of the comparison unit, and the output terminal of the voltage supply unit, respectively, an anode of the first zener diode is connected to an anode of the second zener diode, and a cathode of the second zener diode is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110511778.9A CN113341344B (en) | 2021-05-11 | 2021-05-11 | Circuit on-off detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110511778.9A CN113341344B (en) | 2021-05-11 | 2021-05-11 | Circuit on-off detection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113341344A CN113341344A (en) | 2021-09-03 |
| CN113341344B true CN113341344B (en) | 2023-02-17 |
Family
ID=77470713
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110511778.9A Active CN113341344B (en) | 2021-05-11 | 2021-05-11 | Circuit on-off detection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113341344B (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001136656A (en) * | 1999-11-04 | 2001-05-18 | Nec Corp | Power supply protective circuit |
| CN101900783A (en) * | 2010-07-21 | 2010-12-01 | 宁波英格塑料制品有限公司 | High-voltage testing equipment |
| CN102638024A (en) * | 2012-04-16 | 2012-08-15 | 北京航天发射技术研究所 | Neutral line break protector |
| CN203705582U (en) * | 2014-02-21 | 2014-07-09 | 山东华芯富创电子科技有限公司 | Test circuit for open circuit of conducting circuit |
| CN104007353A (en) * | 2013-02-26 | 2014-08-27 | 鸿富锦精密工业(武汉)有限公司 | Interface detection circuit |
| CN105466032A (en) * | 2015-12-21 | 2016-04-06 | 上海奉天电子股份有限公司 | Positive temperature coefficient (PTC) water heater over-current detection software and hardware dual protection circuit |
| CN208479164U (en) * | 2018-07-12 | 2019-02-05 | 东莞朗勤电子科技有限公司 | A kind of over-current detection protection circuit and electronic cigarette |
| CN110764028A (en) * | 2019-10-10 | 2020-02-07 | 华东光电集成器件研究所 | Integrated circuit pin clamping abnormity detection and protection device |
| CN210224944U (en) * | 2019-07-02 | 2020-03-31 | 上海杰宁新能源科技发展有限公司 | Protection self-locking circuit and switching power supply |
-
2021
- 2021-05-11 CN CN202110511778.9A patent/CN113341344B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001136656A (en) * | 1999-11-04 | 2001-05-18 | Nec Corp | Power supply protective circuit |
| CN101900783A (en) * | 2010-07-21 | 2010-12-01 | 宁波英格塑料制品有限公司 | High-voltage testing equipment |
| CN102638024A (en) * | 2012-04-16 | 2012-08-15 | 北京航天发射技术研究所 | Neutral line break protector |
| CN104007353A (en) * | 2013-02-26 | 2014-08-27 | 鸿富锦精密工业(武汉)有限公司 | Interface detection circuit |
| CN203705582U (en) * | 2014-02-21 | 2014-07-09 | 山东华芯富创电子科技有限公司 | Test circuit for open circuit of conducting circuit |
| CN105466032A (en) * | 2015-12-21 | 2016-04-06 | 上海奉天电子股份有限公司 | Positive temperature coefficient (PTC) water heater over-current detection software and hardware dual protection circuit |
| CN208479164U (en) * | 2018-07-12 | 2019-02-05 | 东莞朗勤电子科技有限公司 | A kind of over-current detection protection circuit and electronic cigarette |
| CN210224944U (en) * | 2019-07-02 | 2020-03-31 | 上海杰宁新能源科技发展有限公司 | Protection self-locking circuit and switching power supply |
| CN110764028A (en) * | 2019-10-10 | 2020-02-07 | 华东光电集成器件研究所 | Integrated circuit pin clamping abnormity detection and protection device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113341344A (en) | 2021-09-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101604282B (en) | Voltage detection alarm device | |
| CN101963835B (en) | Electronic equipment and method for dynamically allocating USB port power | |
| US20060050465A1 (en) | Uninterruptible power supply apparatus controllable by monitoring apparatus via network | |
| US20210223844A1 (en) | Method for protecting operation of server backboard | |
| CN201302715Y (en) | Device for computers | |
| CN112612357B (en) | Abnormal power-off protection system, method and equipment for sub-nodes in server of whole cabinet | |
| CN104571273A (en) | Fan controller and server system provided with same | |
| CN102938797A (en) | Current detection and control device for mobile terminal | |
| CN101876846A (en) | Computer power supply and standby voltage discharge circuit thereon | |
| CN113341344B (en) | Circuit on-off detection device | |
| CN101835313B (en) | LED control device with current monitoring function | |
| KR101553793B1 (en) | Sram memory card and voltage monitoring circuit | |
| CN102568548A (en) | Hard disk power supply circuit | |
| JP5854188B2 (en) | I / O module and duplex system using the same | |
| CN102237667B (en) | Overcurrent detecting circuit of USB port | |
| CN208580396U (en) | Data dump device and computer | |
| CN203551905U (en) | Liquid crystal display panel and communication equipment | |
| CN211701611U (en) | Multi-power-supply parallel electric control device and purifier | |
| CN111708426A (en) | Server and power supply protection circuit thereof | |
| KR100632107B1 (en) | Mobile communication terminal able to warning abnormal input power | |
| CN111313364A (en) | Overvoltage protection device and overvoltage protection method | |
| KR20160113343A (en) | Double Power Supply | |
| US20030227728A1 (en) | Circuit board with protection capability and method of protecting a circuit board | |
| CN101625886B (en) | Control circuit for hard disk light signal and light signal module | |
| CN110688260B (en) | EC reset circuit and electronic equipment based on earphone interface |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |