Fault detection circuit and method

Abstract

The invention discloses a fault detection circuit and method, and relates to the technical field of fault detection, and the circuit comprises an upper computer, a relay, a reverse amplification circuit, and a radio frequency excitation circuit. The upper computer is used for controlling a sixth contact of the relay to be connected with a first contact of the relay and a second contact of the relay to be connected with a fourth contact of the relay if the detected current is greater than a preset current threshold value; if the voltage value of the nth voltage detection point is in nonlinear change and the voltage value of the (n-1) th voltage detection point is in linear change, determining that the nth radio frequency excitation sub-circuit is a fault circuit; checking the component of the fault circuit, and determining a target fault component; and if the detected current is smaller than or equal to the preset current threshold value, controlling a sixth contact of the relay to be connected with a third contact of the relay and controlling a fourth contact of the relay to be connected with a fifth contact of the relay. According to the circuit, the judgment accuracy of a fault circuit and a fault component by a worker is improved.

Description

Technical Field

[0001] The present application relates to the technical field of fault detection, and in particular to a fault detection circuit and method. Background Art

[0002] Quadrupole mass spectrometers are widely used in the fields of medicine, biology, chemical engineering and environmental science as conventional quantitative analysis instruments due to their high sensitivity, fast analysis speed and small sample consumption. The basic principle of a quadrupole mass spectrometer is that ions are focused near the central axis of the quadrupole under the action of an electric field, and ions of different mass-to-charge ratios are selected using an electric field that changes with time. The voltage application method of a conventional quadrupole mass spectrometer is that a set of relative poles applies voltages of the same polarity, while adjacent poles apply voltages of opposite polarity, that is, the voltage amplitudes in the x-axis direction and the y-axis direction are equal, and the phase difference is 180°. After entering the quadrupole, the ions begin a complex oscillating motion under the combined action of the RF power supply circuit, RF power amplifier circuit, resonant amplifier circuit and RF feedback circuit; Among them, the main function of the RF power supply circuit is to generate an excitation signal and a voltage drive signal of the corresponding frequency according to the instructions of the lower computer, and to modulate the RF signal by comparing the drive signal and the load feedback signal.

[0003] However, the RF power supply circuit is a closed-loop circuit. When a sub-circuit of the RF power supply circuit fails, the voltage detection points of each sub-circuit will become abnormal, and the staff cannot accurately locate the faulty components. Summary of the invention

[0004] In view of this, an object of the present invention is to provide a fault detection circuit and method to solve the above-mentioned problem and achieve accurate positioning of the fault of each component of each sub-circuit.

[0005] In a first aspect, the present application provides a fault detection circuit, the circuit comprising: a host computer, a relay, a reverse amplifier circuit and a radio frequency excitation circuit; wherein the radio frequency excitation circuit comprises a plurality of radio frequency excitation sub-circuits; The first contact of the relay is connected to the first input terminal of the reverse amplifier circuit, the output terminal of the reverse amplifier circuit is connected to the second contact of the relay, and the second input terminal of the reverse amplifier circuit is grounded; The third contact of the relay is connected to the first input terminal of the n-1th RF excitation circuit, the fourth contact of the relay is connected to the first input terminal of the n-1th RF excitation sub-circuit, the fifth contact of the relay is connected to the output terminal of the n-1th RF excitation sub-circuit, the first input terminal of the n+1th RF excitation sub-circuit is connected to the output terminal of the n-1th RF excitation sub-circuit, the second input terminal of each RF excitation sub-circuit is grounded, and the output terminal of the n-th RF excitation sub-circuit is connected to the n-th voltage detection point; The sixth contact of the relay is connected to the first power supply voltage, the control end of the host computer is connected to the first end of the winding of the relay, and the second end of the winding of the relay is connected to the second power supply voltage; The host computer is used to obtain the detection current; if the detection current is greater than the preset current threshold, the sixth contact of the relay is controlled to be connected to the first contact of the relay and the second contact of the relay is connected to the fourth contact of the relay; the voltage of each voltage detection point is obtained; if the voltage value of the nth voltage detection point changes nonlinearly and the voltage value of the n-1th voltage detection point changes linearly, the nth RF excitation sub-circuit is determined to be a fault circuit; the components of the fault circuit are checked to determine the target faulty components.

[0006] Preferably, the radio frequency excitation circuit includes: a differential amplifier circuit, an amplitude modulation circuit, a voltage-controlled amplifier circuit or an integral amplifier circuit; the voltage detection point includes: a first voltage detection point, a second voltage detection point or a third voltage detection point; The third contact of the relay is connected to the first end of the first resistor, the second end of the first resistor is respectively connected to the first input end of the integral amplifier circuit and the first end of the second resistor, the output end of the integral amplifier circuit is connected to the fifth contact of the relay, the second end of the second resistor is respectively connected to the first voltage detection point and the output end of the differential amplifier circuit, and the second input end of the integral amplifier circuit is grounded; The first input terminal of the differential amplifier circuit and the second voltage detection point are commonly connected to the output terminal of the voltage-controlled amplifier circuit, and the second input terminal of the differential amplifier circuit is grounded; The first input end of the voltage-controlled amplifier circuit is respectively connected to the output end of the amplitude modulation circuit and the third voltage detection point, the first input end of the amplitude modulation circuit is connected to the fourth contact of the relay, and the second input end of the amplitude modulation circuit is grounded; The host computer is specifically used to obtain the voltage value of the first voltage detection point, the voltage value of the second voltage detection point and the voltage value of the third voltage detection point; if the voltage value of the first voltage detection point changes linearly, the integral amplifier circuit is determined to be the fault circuit; if the voltage value of the first voltage detection point changes nonlinearly and the voltage value of the second voltage detection point changes linearly, the differential amplifier circuit is determined to be the fault circuit; if the voltage value of the second voltage detection point changes nonlinearly and the voltage value of the third voltage detection point changes linearly, the voltage-controlled amplifier circuit is determined to be the fault circuit; if the voltage value of the third voltage detection point changes nonlinearly, the amplitude modulation circuit is determined to be the fault circuit.

[0007] Preferably, the integration amplifier circuit comprises: a third resistor, a first capacitor and a first operational amplifier; The first input terminal of the integrating amplifier circuit is connected to the inverting input terminal of the first operational amplifier, the second input terminal of the integrating amplifier circuit is connected to the positive input terminal of the first operational amplifier, and the output terminal of the integrating amplifier circuit is connected to the output terminal of the first operational amplifier; The second end of the first resistor is connected to the first end of the third resistor and the inverting input end of the first operational amplifier respectively, the second end of the third resistor is connected to the first end of the first capacitor, the second end of the first capacitor is connected to the output end of the first operational amplifier, and the positive input end of the first operational amplifier is grounded; The host computer is further used to analyze the first image fed back by the camera to obtain a first analysis result; wherein the first image is an image of the connection points between the pins at both ends of the third resistor and the corresponding pads; the resistance value of the third resistor is detected to obtain a first detection result; if the first analysis result indicates that one and / or two pins of the third resistor are not connected to the corresponding pads, the welding of the third resistor is determined to be abnormal; if the first detection result indicates that the resistance value of the third resistor exceeds the first resistance standard range, the third resistor is determined to be faulty; the second image fed back by the camera is analyzed to obtain a second analysis result; wherein the second image is an image of the connection points between the pins at both ends of the first capacitor and the corresponding pads; the capacitance of the first capacitor is detected to obtain a second detection result; if the second analysis result indicates that one and / or two pins of the first capacitor are not connected to the corresponding pads, the welding of the first capacitor is determined to be abnormal; if the second detection result indicates that the capacitance value of the first capacitor exceeds the first capacitance standard range, the first capacitor is determined to be faulty; if the first capacitor and the third resistor are both welded normally and the first capacitor and the third resistor are both normal, the first operational amplifier is determined to be faulty.

[0008] Preferably, the amplitude modulation circuit comprises: a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor and a second operational amplifier; The first input terminal of the amplitude modulation circuit is connected to the inverting input terminal of the second operational amplifier, the second input terminal of the amplitude modulation circuit is connected to the positive input terminal of the second operational amplifier, and the output terminal of the amplitude modulation circuit is connected to the output terminal of the second operational amplifier; The first end of the fourth resistor is connected to the fourth contact of the relay, the first end of the fifth resistor is grounded, the inverting input end of the second operational amplifier is respectively connected to the second end of the fourth resistor and the first end of the sixth resistor, the positive input end of the second operational amplifier is connected to the second end of the fifth resistor, the output end of the second operational amplifier is connected to the first end of the seventh resistor, the second end of the seventh resistor is connected to the first end of the eighth resistor, and the second end of the eighth resistor is respectively connected to the second end of the fifth resistor and the positive input end of the second operational amplifier.

[0009] The host computer is further used to analyze the third image fed back by the camera to obtain a third analysis result; wherein the third image is an image of the connection points between the pins at both ends of the fourth resistor and the corresponding pads; the resistance value of the fourth resistor is detected to obtain a third detection result; if the third analysis result indicates that one and / or two pins of the fourth resistor are not connected to the corresponding pads, it is determined that the welding of the fourth resistor is abnormal; if the third detection result indicates that the resistance value of the fourth resistor exceeds the second resistance standard range, it is determined that the fourth resistor is faulty; the fourth image fed back by the camera is analyzed to obtain a fourth analysis result; wherein the fourth image is the fifth An image of the connection points between the pins at both ends of the resistor and their corresponding pads; the resistance value of the fifth resistor is detected to obtain a fourth detection result; if the fourth analysis result indicates that one and / or two pins of the fifth resistor are not connected to their corresponding pads, it is determined that the welding of the fifth resistor is abnormal; if the fourth detection result indicates that the resistance value of the fifth resistor exceeds the third resistance standard range, it is determined that the fifth resistor is faulty; the fifth image fed back by the camera is analyzed to obtain a fifth analysis result; wherein the fifth image is an image of the connection points between the pins at both ends of the sixth resistor and their corresponding pads; the resistance value of the sixth resistor is detected to obtain a fifth detection result; if The fifth analysis result indicates that one and / or two pins of the sixth resistor are not connected to their corresponding pads, and the sixth resistor is determined to be abnormally welded; if the fifth detection result indicates that the resistance of the sixth resistor exceeds the fourth resistance standard range, the sixth resistor is determined to be faulty; the sixth image fed back by the camera is analyzed to obtain the sixth analysis result; wherein the sixth image is an image of the connection points between the pins at both ends of the seventh resistor and their corresponding pads; the resistance of the seventh resistor is detected to obtain the sixth detection result; if the sixth analysis result indicates that one and / or two pins of the seventh resistor are not connected to their corresponding pads, the seventh resistor is determined to be Welding abnormality; if the sixth detection result indicates that the resistance value of the seventh resistor exceeds the fifth resistance value standard range, the seventh resistor is determined to be faulty; the seventh image fed back by the camera is analyzed to obtain a seventh analysis result; wherein the seventh image is an image of the connection points between the pins at both ends of the eighth resistor and the corresponding pads; the resistance value of the eighth resistor is detected to obtain the seventh detection result; if the seventh analysis result indicates that one and / or two pins of the eighth resistor are not connected to the corresponding pads, the eighth resistor is determined to be welded abnormally; if the seventh detection result indicates that the resistance value of the eighth resistor exceeds the sixth resistance value standard range, the eighth resistor is determined to be faulty;If the fourth resistor, the fifth resistor, the sixth resistor, the seventh resistor and the eighth resistor are all normal and the fourth resistor, the fifth resistor, the sixth resistor, the seventh resistor and the eighth resistor are all welded normally, it is determined that the second operational amplifier is faulty. ;

[0010] Preferably, the differential amplifier circuit comprises: a ninth resistor and a third operational amplifier; The first input terminal of the differential amplifier circuit is respectively connected to the inverting input terminal and the positive input terminal of the third operational amplifier, the second input terminal of the differential amplifier circuit is connected to the ground terminal of the third operational amplifier, and the output terminal of the differential amplifier circuit is connected to the output terminal of the third operational amplifier; The first end of the ninth resistor is connected to the first end of the third operational amplifier, and the second end of the ninth resistor is connected to the second end of the third operational amplifier; The host computer is also used to analyze the eighth image fed back by the camera to obtain an eighth analysis result; wherein the eighth image is an image of the connection points between the pins at both ends of the ninth resistor and their corresponding pads; the resistance value of the ninth resistor is detected to obtain an eighth detection result; if the eighth analysis result indicates that one and / or two pins of the ninth resistor are not connected to their corresponding pads, it is determined that the welding of the ninth resistor is abnormal; if the eighth detection result indicates that the resistance value of the ninth resistor exceeds the seventh resistance standard range, it is determined that the ninth resistor is faulty; if the ninth resistor is normal and the ninth resistor is welded normally, it is determined that the third operational amplifier is faulty.

[0011] Preferably, the host computer is also used to control the sixth contact of the relay to be connected to the third contact of the relay and the fourth contact of the relay to be connected to the fifth contact of the relay if the detected current is less than or equal to the preset current threshold.

[0012] Preferably, the radio frequency excitation circuit further comprises: a digital-to-analog conversion circuit and a fourth voltage detection point; The input end of the digital-to-analog conversion circuit is connected to the first power supply voltage, and the output end of the digital-to-analog conversion circuit is respectively connected to the fourth voltage detection point and the sixth contact of the relay; The host computer is further used to obtain the voltage value of the fourth voltage detection point; if the voltage value of the fourth voltage detection point changes nonlinearly, it is determined that the digital-to-analog conversion circuit is the fault circuit.

[0013] Preferably, the reverse amplification circuit comprises: a fourth operational amplifier; The first input terminal of the reverse amplifier circuit is connected to the reverse input terminal of the fourth operational amplifier, the second input terminal of the reverse amplifier circuit is connected to the positive input terminal of the fourth operational amplifier, and the output terminal of the reverse amplifier circuit is connected to the output terminal of the fourth operational amplifier; The first output terminal of the fourth operational amplifier is connected to the first input terminal of the fourth operational amplifier.

[0014] It can be seen from the above technical solution that the present application has at least the following beneficial effects: The fault detection circuit provided by the present application can change the circuit from the original closed-loop form to the open-loop form when the RF excitation circuit fails, so that the staff can accurately judge whether each RF excitation subcircuit is faulty based on the voltage value of each voltage detection point, and then accurately judge whether each component in each faulty RF excitation subcircuit is faulty. The circuit converts the RF excitation circuit into a circuit that can be switched between closed-loop and open-loop states through a host computer, a relay, and a reverse amplifier circuit, avoiding the staff's misjudgment of the faulty circuit and the faulty components. This arrangement improves the staff's judgment accuracy on the faulty circuit and the faulty components, and efficiently solves the fault location problem of the RF excitation circuit.

[0015] In a second aspect, the present application provides a fault detection method, which is applied to the fault detection circuit, wherein the circuit includes: a host computer, a relay, a reverse amplifier circuit and a radio frequency excitation circuit; wherein the radio frequency excitation circuit includes multiple radio frequency excitation sub-circuits; the first contact of the relay is connected to the first input end of the reverse amplifier circuit, the output end of the reverse amplifier circuit is connected to the second contact of the relay, and the second input end of the reverse amplifier circuit is grounded; the third contact of the relay is connected to the first input end of the n-1th radio frequency excitation circuit, the fourth contact of the relay is connected to the first input end of the n-th radio frequency excitation sub-circuit, the fifth contact of the relay is connected to the output end of the n-1th radio frequency excitation sub-circuit, the first input end of the n+1th radio frequency excitation sub-circuit is connected to the output end of the n-th radio frequency excitation sub-circuit, the second input end of each radio frequency excitation sub-circuit is grounded, and the output end of the n-th radio frequency excitation sub-circuit is connected to the n-th voltage detection point; the sixth contact of the relay is connected to the first power supply voltage, the control end of the host computer is connected to the first end of the winding of the relay, and the second end of the winding of the relay is connected to the second power supply voltage; the method includes: The host computer obtains the detection current; If the detected current is greater than the preset current threshold, the host computer controls the sixth contact of the relay to be connected to the first contact of the relay and the second contact of the relay to be connected to the fourth contact of the relay; The host computer obtains the voltage of each voltage detection point; If the voltage value of the nth voltage detection point changes nonlinearly and the voltage value of the n-1th voltage detection point changes linearly, the host computer determines that the nth radio frequency excitation subcircuit is a fault circuit; The host computer checks the components of the faulty circuit to determine the target faulty components.

[0016] Preferably, the method further comprises: If the detected current is less than or equal to the preset current threshold, the host computer controls the sixth contact of the relay to be connected to the third contact of the relay and the fourth contact of the relay to be connected to the fifth contact of the relay.

[0017] The fault detection method provided in the present application has the same technical features as the above-mentioned fault detection circuit, so it can also solve the same technical problems and achieve the same technical effects.

[0018] It should be understood that the description of technical features, technical solutions, beneficial effects or similar language in this application does not imply that all features and advantages can be realized in any single embodiment. On the contrary, it is understood that the description of features or beneficial effects means that specific technical features, technical solutions or beneficial effects are included in at least one embodiment. Therefore, the description of technical features, technical solutions or beneficial effects in this specification does not necessarily refer to the same embodiment. Furthermore, the technical features, technical solutions and beneficial effects described in the present embodiment can also be combined in any appropriate manner. Those skilled in the art will understand that the embodiment can be realized without one or more specific technical features, technical solutions or beneficial effects of a specific embodiment. In other embodiments, additional technical features and beneficial effects can also be identified in a specific embodiment that does not embody all embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of a fault detection circuit structure provided in an embodiment of the present application; Figure 2 A schematic diagram of another fault detection circuit structure provided in an embodiment of the present application. DETAILED DESCRIPTION

[0020] The terms "first", "second", "third", etc. in the specification of this application and the accompanying drawings are used to distinguish different objects rather than to limit a specific order.

[0021] In the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0022] The embodiment of the present invention provides a fault detection circuit, such as Figure 1 As shown, Figure 1 A schematic diagram of a fault detection circuit structure provided in an embodiment of the present application. The circuit includes: a host computer 100, a relay 200, a reverse amplifier circuit 300 and a radio frequency excitation circuit; wherein the radio frequency excitation circuit (not shown in the figure) includes a plurality of radio frequency excitation sub-circuits 501; a first contact 1 of the relay 200 is connected to a first input end of the reverse amplifier circuit 300, an output end of the reverse amplifier circuit 300 is connected to a second contact 2 of the relay 200, and the second input end of the reverse amplifier circuit 300 is grounded; a third contact 3 of the relay 200 is connected to a first input end of the n-1th radio frequency excitation circuit, a fourth contact 4 of the relay 200 is connected to a first input end of the n-th radio frequency excitation sub-circuit 501, a fifth contact 5 of the relay 200 is connected to an output end of the n-1th radio frequency excitation sub-circuit 501, a first input end of the n+1th radio frequency excitation sub-circuit 501 is connected to an output end of the n-th radio frequency excitation sub-circuit 501, a second input end of each radio frequency excitation sub-circuit 501 is grounded, and an output end of the n-th radio frequency excitation sub-circuit 501 is connected to an n-th voltage detection point TP; The sixth contact 6 of the relay 200 is connected to the first power supply voltage U1, the control end of the host computer 100 is connected to the first end of the winding of the relay 200, and the second end of the winding of the relay 200 is connected to the second power supply voltage U2; the host computer 100 is used to obtain the detection current; if the detection current is greater than the preset current threshold, the sixth contact 6 of the relay 200 is controlled to be connected to the first contact 1 of the relay 200 and the second contact 2 of the relay 200 is connected to the fourth contact 4 of the relay 200; the voltage of each voltage detection point is obtained; if the voltage value of the nth voltage detection point TP changes nonlinearly and the voltage value of the n-1th voltage detection point TP changes linearly, the nth RF excitation sub-circuit 501 is determined to be a fault circuit; the components of the fault circuit are checked to determine the target faulty components; if the detection current is less than or equal to the preset current threshold, the sixth contact 6 of the relay 200 is controlled to be connected to the third contact 3 of the relay 200 and the fourth contact 4 of the relay 200 is connected to the fifth contact 5 of the relay 200. The second supply voltage U2 is 5V.

[0023] Specifically, the RF excitation circuit composed of each RF excitation subcircuit 501 in the circuit is a closed-loop circuit. If any RF excitation subcircuit 501 in the RF excitation circuit fails, it will affect each RF excitation subcircuit 501. The staff cannot troubleshoot the faulty RF excitation subcircuit 501, and thus cannot determine the specific component that has failed. In order to accurately locate the fault of each RF excitation subcircuit 501 and each component in each RF excitation subcircuit 501, it is necessary to transform the closed-loop circuit composed of each RF excitation subcircuit 501 into an open-loop circuit so that each RF excitation subcircuit 501 will not affect each other.

[0024] With such arrangement, when the RF excitation circuit works normally, that is, when the detection current is less than or equal to the preset current threshold, the input current of the RF excitation circuit flows in sequence from the sixth contact 6 of the relay 200, the third contact 3 of the relay 200, the first input terminal of the n-1th RF excitation subcircuit 501, the output terminal of the n-1th RF excitation subcircuit 501, the fifth contact 5 of the relay 200, the fourth contact 4 of the relay 200, the first input terminal of the n-th RF excitation subcircuit 501, the output terminal of the n-1th RF excitation subcircuit 501 to the first input terminal of the n-1th RF excitation subcircuit 501, forming a closed loop circuit; when the RF excitation circuit fails, that is, when the detection current is less than or equal to the preset current threshold, the input current of the RF excitation circuit flows in sequence from the sixth contact 6 of the relay 200, the third contact 3 of the relay 200, the first input terminal of the n-1th RF excitation subcircuit 501, the output terminal of the n-1th RF excitation subcircuit 501 When the current is greater than the preset current threshold, the input current of the RF excitation circuit flows from the sixth contact 6 of the relay 200, the first contact 1 of the relay 200, the first input terminal of the reverse amplifier circuit 300, the output terminal of the reverse amplifier circuit 300, the second contact 2 of the relay 200, the fourth contact 4 of the relay 200, the first input terminal of the nth RF excitation sub-circuit 501, the output terminal of the nth RF excitation sub-circuit 501 to the first input terminal of the n-1th RF excitation sub-circuit 501. Since there is no circuit connected after the fifth contact 5 of the relay 200 connected to the output terminal of the n-1th RF excitation sub-circuit 501, the RF excitation circuit is an open-loop circuit at this time.

[0025] When the RF excitation circuit is an open-loop circuit, the voltage value of each voltage detection point represents the voltage value of the output end of the RF excitation subcircuit 501 to which each voltage detection point is connected. The following is an example. For example: if the voltage value of the third voltage detection point TP is linear, it means that the circuits composed of the first RF excitation subcircuit 501, the second RF excitation subcircuit 501, and the third RF excitation subcircuit 501 are all non-fault circuits, but if the voltage value of the fourth voltage detection point TP is non-linear, it means that the RF excitation subcircuit 501 between the third voltage detection point and the fourth voltage detection point, that is, the fourth RF excitation subcircuit 501 is a faulty circuit. Further investigation of the components of the fourth RF excitation subcircuit 501 can determine the specific faulty components.

[0026] When the RF excitation circuit fails, the circuit can be changed from the original closed-loop form to an open-loop form, so that the staff can accurately judge whether each RF excitation subcircuit 501 is faulty according to the voltage value of each voltage detection point TP, and then accurately judge whether each component in each faulty RF excitation subcircuit 501 is faulty. Compared with the fuzzy fault location caused by the feedback mechanism of the RF excitation circuit in the closed-loop state in the prior art, the circuit converts the RF excitation circuit into a circuit that can be switched between closed-loop and open-loop states through the host computer 100, the relay 200 and the reverse amplifier circuit 300, avoiding the staff's misjudgment of the faulty circuit and the faulty components. Such a setting improves the staff's judgment accuracy on the faulty circuit and the faulty components, and efficiently solves the fault location problem of the RF excitation circuit. In addition, isolating the faulty RF excitation circuit from the closed-loop state can prevent the fault from spreading, that is, continuing to affect other circuits, thereby protecting the stability and reliability of the entire circuit. The open-loop form makes maintenance work simpler and more direct. The staff can repair or replace the faulty RF excitation sub-circuit 501 and components without making complex adjustments to the entire RF excitation circuit.

[0027] The structure of the radio frequency excitation circuit composed of the differential amplifier circuit 600, the amplitude modulation circuit 700, the voltage-controlled amplifier circuit 800 and the integral amplifier circuit 900 is specifically described below. Figure 2 As shown, Figure 2Another schematic diagram of the fault detection circuit structure provided in the embodiment of the present application. The above-mentioned RF excitation circuit includes: a differential amplifier circuit 600, an amplitude modulation circuit 700, a voltage-controlled amplifier circuit 800 or an integral amplifier circuit 900; the voltage detection point TP includes: a first voltage detection point TP1, a second voltage detection point TP2 or a third voltage detection point TP3; the third contact 3 of the relay 200 is connected to the first end of the first resistor R1, and the second end of the first resistor R1 is respectively connected to the first input end of the integral amplifier circuit 900 and the first end of the second resistor R2, the output end of the integral amplifier circuit 900 is connected to the fifth contact 5 of the relay 200, and the second end of the second resistor R2 is respectively connected to the first voltage detection point TP1 and the output end of the differential amplifier circuit 600, and the second input end of the integral amplifier circuit 900 is grounded; the first input end of the differential amplifier circuit 600 and the second voltage detection point TP2 are commonly connected to the output end of the voltage-controlled amplifier circuit 800, and the second input end of the differential amplifier circuit 600 is grounded; the first input end of the voltage-controlled amplifier circuit 800 is respectively The output terminal of the amplitude modulation circuit 700 and the third voltage detection point TP3 are connected, the first input terminal of the amplitude modulation circuit 700 is connected to the fourth contact 4 of the relay 200, and the second input terminal of the amplitude modulation circuit 700 is grounded; the host computer 100 is specifically used to obtain the voltage value of the first voltage detection point TP1, the voltage value of the second voltage detection point TP2 and the voltage value of the third voltage detection point TP3; if the voltage value of the first voltage detection point TP1 changes linearly, the integral amplifier circuit 900 is determined to be a fault circuit; if the voltage value of the first voltage detection point TP1 changes nonlinearly and the voltage value of the second voltage detection point TP2 changes linearly, the differential amplifier circuit 600 is determined to be a fault circuit; if the voltage value of the second voltage detection point TP2 changes nonlinearly and the voltage value of the third voltage detection point TP3 changes linearly, the voltage-controlled amplifier circuit 800 is determined to be a fault circuit; if the voltage value of the third voltage detection point TP3 changes nonlinearly, the amplitude modulation circuit 700 is determined to be a fault circuit.

[0028] Specifically, the RF excitation circuit composed of the integral amplifier circuit 900, the amplitude modulation circuit 700, the voltage-controlled amplifier circuit 800 and the differential amplifier circuit 600 in the circuit is a closed-loop circuit. If any one of the integral amplifier circuit 900, the amplitude modulation circuit 700, the voltage-controlled amplifier circuit 800 and the differential amplifier circuit 600 fails, it will affect the other circuits and affect the staff's troubleshooting of the remaining circuits. In order to accurately locate the fault of any one of the integral amplifier circuit 900, the amplitude modulation circuit 700, the voltage-controlled amplifier circuit 800 and the differential amplifier circuit 600, it is necessary to transform the entire closed-loop RF excitation circuit into an open-loop circuit so that there is no impact between the above-mentioned integral amplifier circuit 900, the amplitude modulation circuit 700, the voltage-controlled amplifier circuit 800 and the differential amplifier circuit 600.

[0029] With such arrangement, when the RF excitation circuit operates normally, that is, when the detection current is less than or equal to the preset current threshold, the input current of the RF excitation circuit flows in sequence from the sixth contact 6 of the relay 200, the third contact 3 of the relay 200, the first input terminal of the integrating amplifier circuit 900, the output terminal of the integrating amplifier circuit 900, the fifth contact 5 of the relay 200, the fourth contact 4 of the relay 200, the first input terminal of the amplitude modulation circuit 700, the output terminal of the amplitude modulation circuit 700, the first input terminal of the voltage-controlled amplifier circuit 800, the output terminal of the voltage-controlled amplifier circuit 800, the first input terminal of the differential amplifier circuit 600, and the output terminal of the differential amplifier circuit 600 to the first input terminal of the integrating amplifier circuit 900, forming a closed loop circuit.

[0030] When the RF excitation circuit fails, that is, when the detection current is greater than the preset current threshold, the input current of the RF excitation circuit flows in sequence from the sixth contact 6 of the relay 200, the first contact 1 of the relay 200, the first input end of the reverse amplifier circuit 300, the output end of the reverse amplifier circuit 300, the second contact 2 of the relay 200, the fourth contact 4 of the relay 200, the first input end of the amplitude modulation circuit 700, the output end of the amplitude modulation circuit 700, the first input end of the voltage-controlled amplifier circuit 800, the output end of the voltage-controlled amplifier circuit 800, the first input end of the differential amplifier circuit 600, the output end of the differential amplifier circuit 600 to the first input end of the integral amplifier circuit 900. Since there is no circuit connected after the fifth contact 5 of the relay 200 connected to the output end of the integral amplifier circuit 900, the RF excitation circuit is an open-loop circuit at this time.

[0031] More specifically, when the RF excitation circuit is an open-loop circuit, the voltage value of the first voltage detection point TP1 is the voltage value of the output end of the differential amplifier circuit 600, the voltage value of the second voltage detection point TP2 is the voltage value of the output end of the voltage-controlled amplifier circuit 800, and the voltage value of the third voltage detection point TP3 is the voltage value of the output end of the amplitude modulation circuit 700. If the voltage value of the first voltage detection point TP1 is linear, it means that the differential amplifier circuit 600, the voltage-controlled amplifier circuit 800, the amplitude modulation circuit 700 and the reverse amplifier circuit 300 are all non-fault circuits, and because the first resistor R1 and the second resistor R2 do not participate in the operation of the RF excitation circuit, at this time, the faulty circuit can only be the integral amplifier circuit 900.

[0032] If the voltage value of the first voltage detection point TP1 changes nonlinearly, it means that the differential amplifier circuit 600, the voltage-controlled amplifier circuit 800, the amplitude modulation circuit 700 and the reverse amplifier circuit 300 are all likely to be faulty circuits, while the voltage value of the second voltage detection point TP2 changes linearly, which means that the voltage-controlled amplifier circuit 800, the amplitude modulation circuit 700 and the reverse amplifier circuit 300 are all non-faulty circuits, so the faulty circuit can only be the differential amplifier circuit 600.

[0033] If the voltage value at the second voltage detection point TP2 changes nonlinearly, it means that the voltage-controlled amplifier circuit 800, the amplitude modulation circuit 700 and the reverse amplifier circuit 300 are all likely to be faulty circuits, while the voltage value at the third voltage detection point TP3 changes linearly, which means that the amplitude modulation circuit 700 and the reverse amplifier circuit 300 are both non-faulty circuits, so the faulty circuit can only be the voltage-controlled amplifier circuit 800.

[0034] If the voltage value of the third voltage detection point TP3 changes nonlinearly, and since the reverse amplifier circuit 300 is not a closed-loop RF excitation circuit, that is, the reverse amplifier circuit 300 is an open-loop circuit, it can be known that the faulty circuit can only be the amplitude modulation circuit 700.

[0035] With such a configuration, the circuit can change the circuit from the original closed-loop form to the open-loop form when the RF excitation circuit fails. The staff can determine whether the voltage value of the first voltage detection point TP1, the voltage value of the second voltage detection point TP2, and the voltage value of the third voltage detection point TP3 are linear changes, and combine the elimination method to locate the fault conditions of the integral amplifier circuit 900, the amplitude modulation circuit 700, the voltage-controlled amplifier circuit 800, and the differential amplifier circuit 600, thereby avoiding the staff from misjudging the faulty circuit. The circuit improves the staff's judgment accuracy on the faulty circuit and improves the fault location efficiency of the RF excitation circuit.

[0036] The structure of the integral amplifier circuit 900 is introduced below. Figure 2 As shown, Figure 2Another schematic diagram of the fault detection circuit structure provided in the embodiment of the present application. The above-mentioned integral amplifier circuit includes: a third resistor R3, a first capacitor C1 and a first operational amplifier OP1; the first input end of the integral amplifier circuit is connected to the reverse input end of the first operational amplifier OP1, the second input end of the integral amplifier circuit is connected to the forward input end of the first operational amplifier OP1, and the output end of the integral amplifier circuit is connected to the output end of the first operational amplifier OP1; the second end of the first resistor is respectively connected to the first end of the third resistor R3 and the reverse input end of the first operational amplifier OP1, the second end of the third resistor R3 is connected to the first end of the first capacitor C1, the second end of the first capacitor C1 is connected to the output end of the first operational amplifier OP1, and the forward input end of the first operational amplifier OP1 is grounded; the host computer is specifically used to analyze the first image fed back by the camera to obtain a first analysis result; wherein the first image is an image of the connection points between the pins at both ends of the third resistor R3 and their respective corresponding pads; the resistance value of the third resistor R3 is detected to obtain a first Detection results; if the first analysis result indicates that one and / or two pins of the third resistor R3 are not connected to their respective corresponding pads, it is determined that the welding of the third resistor R3 is abnormal; if the first detection result indicates that the resistance of the third resistor R3 exceeds the first resistance standard range, it is determined that the third resistor R3 is faulty; the second image fed back by the camera is analyzed to obtain a second analysis result; wherein the second image is an image of the connection points between the pins at both ends of the first capacitor C1 and their respective corresponding pads; the capacitance of the first capacitor C1 is detected to obtain a second detection result; if the second analysis result indicates that one and / or two pins of the first capacitor C1 are not connected to their respective corresponding pads, it is determined that the welding of the first capacitor C1 is abnormal; if the second detection result indicates that the capacitance of the first capacitor C1 exceeds the first capacitance standard range, it is determined that the first capacitor C1 is faulty; if the first capacitor C1 and the third resistor R3 are both welded normally and the first capacitor C1 and the third resistor R3 are both normal, it is determined that the first operational amplifier OP1 is faulty.

[0037] Specifically, when it is determined that the integrating amplifier circuit 900 is a faulty circuit, it is necessary to check the third resistor R3, the first capacitor C1 and the first operational amplifier OP1 one by one. First, it is necessary to determine whether the third resistor R3 and the first capacitor C1 are welded normally, and then it is necessary to determine whether the third resistor R3 and the first capacitor C1 are faulty. If the third resistor R3 and the first capacitor C1 are not faulty (normal) and the third resistor R3 and the first capacitor C1 are welded normally, it is determined that the faulty component is the first operational amplifier OP1.

[0038] In this circuit, according to the welding conditions of the third resistor R3 and the first capacitor C1, the fault caused by poor welding can be quickly eliminated, and time and resources can be avoided in subsequent complex detection. After eliminating the possibility of the third resistor R3 and the first capacitor C1, it can be determined that the faulty component is the first operational amplifier OP1. This circuit improves the accuracy of troubleshooting of each component in the integral amplifier circuit 900, and also ensures the pertinence of the maintenance of each component.

[0039] The structure of the amplitude modulation circuit 700 is described below. Figure 2 As shown, Figure 2Another schematic diagram of the fault detection circuit structure provided by the embodiment of the present application. The above-mentioned amplitude modulation circuit 700 includes: a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8 and a second operational amplifier OP2; the first input end of the amplitude modulation circuit 700 is connected to the reverse input end of the second operational amplifier OP2, the second input end of the amplitude modulation circuit 700 is connected to the forward input end of the second operational amplifier OP2, and the output end of the amplitude modulation circuit 700 is connected to the output end of the second operational amplifier OP2; the first end of the fourth resistor R4 is connected to the fourth contact 4 of the relay 200, the first end of the fifth resistor R5 is grounded, the reverse input end of the second operational amplifier OP2 is respectively connected to the second end of the fourth resistor R4 and the first end of the sixth resistor R6, the forward input end of the second operational amplifier OP2 is connected to the second end of the fifth resistor R5, the output end of the second operational amplifier OP2 is connected to the first end of the seventh resistor R7, the second end of the seventh resistor R7 is connected to the first end of the eighth resistor R8, and the second end of the eighth resistor R8 is respectively connected to the second end of the fifth resistor R5 and the forward input end of the second operational amplifier OP2.The upper computer is specifically used to analyze the third image fed back by the camera to obtain a third analysis result; wherein the third image is an image of the connection points between the pins at both ends of the fourth resistor R4 and the corresponding pads; the resistance value of the fourth resistor R4 is detected to obtain a third detection result; if the third analysis result indicates that one and / or two pins of the fourth resistor R4 are not connected to the corresponding pads, it is determined that the welding of the fourth resistor R4 is abnormal; if the third detection result indicates that the resistance value of the fourth resistor R4 exceeds the second resistance standard range, it is determined that the fourth resistor R4 is faulty; the fourth image fed back by the camera is analyzed to obtain a fourth analysis result; wherein the fourth image is an image of the connection points between the pins at both ends of the fifth resistor R5 and the corresponding pads; The resistance value of the fifth resistor R5 is detected to obtain a fourth detection result; if the fourth analysis result indicates that one and / or two pins of the fifth resistor R5 are not connected to their corresponding pads, it is determined that the welding of the fifth resistor R5 is abnormal; if the fourth detection result indicates that the resistance value of the fifth resistor R5 exceeds the third resistance standard range, it is determined that the fifth resistor R5 is faulty; the fifth image fed back by the camera is analyzed to obtain a fifth analysis result; wherein the fifth image is an image of the connection points between the pins at both ends of the sixth resistor R6 and their corresponding pads; the resistance value of the sixth resistor R6 is detected to obtain a fifth detection result; if the fifth analysis result indicates that one and / or two pins of the sixth resistor R6 are not connected to their corresponding pads, it is determined that the welding of the sixth resistor R6 is abnormality; if the fifth detection result indicates that the resistance value of the sixth resistor R6 exceeds the fourth resistance value standard range, it is determined that the sixth resistor R6 is faulty; the sixth image fed back by the camera is analyzed to obtain a sixth analysis result; wherein the sixth image is an image of the connection points between the pins at both ends of the seventh resistor R7 and their corresponding pads; the resistance value of the seventh resistor R7 is detected to obtain a sixth detection result; if the sixth analysis result indicates that one and / or two pins of the seventh resistor R7 are not connected to their corresponding pads, it is determined that the seventh resistor R7 is welded abnormally; if the sixth detection result indicates that the resistance value of the seventh resistor R7 exceeds the fifth resistance value standard range, it is determined that the seventh resistor R7 is faulty; the seventh image fed back by the camera is analyzed to obtain a seventh analysis result; wherein In the figure, the seventh image is an image of the connection points between the pins at both ends of the eighth resistor R8 and their corresponding pads; the resistance of the eighth resistor R8 is detected to obtain a seventh detection result; if the seventh analysis result indicates that one and / or two pins of the eighth resistor R8 are not connected to their corresponding pads, it is determined that the welding of the eighth resistor R8 is abnormal; if the seventh detection result indicates that the resistance of the eighth resistor R8 exceeds the sixth resistance standard range, it is determined that the eighth resistor R8 is faulty; if the fourth resistor R4, the fifth resistor R5, the sixth resistor R6, the seventh resistor R7 and the eighth resistor R8 are all normal and the fourth resistor R4, the fifth resistor R5, the sixth resistor R6, the seventh resistor R7 and the eighth resistor R8 are all welded normally, it is determined that the second operational amplifier OP2 is faulty.

[0040] Specifically, when it is determined that the amplitude modulation circuit 700 is a faulty circuit, it is necessary to check the fourth resistor R4, the fifth resistor R5, the sixth resistor R6, the seventh resistor R7, the eighth resistor R8 and the second operational amplifier OP2 one by one. First, it is necessary to determine whether the fourth resistor R4, the fifth resistor R5, the sixth resistor R6, the seventh resistor R7 and the eighth resistor R8 are welded normally and whether a fault occurs. If the fourth resistor R4, the fifth resistor R5, the sixth resistor R6, the seventh resistor R7 and the eighth resistor R8 are welded normally and without a fault, it is determined that the faulty component is the second operational amplifier OP2.

[0041] With this arrangement, the circuit can quickly eliminate component failures caused by process (welding) problems, greatly improving the accuracy and efficiency of troubleshooting. Each component is checked one by one to avoid misjudgment of component failures. The circuit is rigorous and can ensure the comprehensiveness and accuracy of fault component troubleshooting. In addition, the faulty components can be replaced or repaired in a targeted manner, saving repair time and cost.

[0042] The structure of the differential amplifier circuit 600 is described below. Figure 2 As shown, Figure 2 Another schematic diagram of the fault detection circuit structure provided by the embodiment of the present application. The above-mentioned differential amplifier circuit 600 includes: a ninth resistor R9 and a third operational amplifier OP3; the first input terminal of the differential amplifier circuit 600 is respectively connected to the reverse input terminal and the forward input terminal of the third operational amplifier OP3, the second input terminal of the differential amplifier circuit 600 is connected to the ground terminal of the third operational amplifier OP3, and the output terminal of the differential amplifier circuit 600 is connected to the output terminal of the third operational amplifier OP3; the first terminal of the ninth resistor R9 is connected to the first terminal of the third operational amplifier OP3, and the second terminal of the ninth resistor R9 is connected to the second terminal of the third operational amplifier OP3; the upper computer is specifically used for the camera (not shown in the figure) The eighth image fed back by the ninth resistor R9 is analyzed to obtain an eighth analysis result; wherein the eighth image is an image of the connection points between the pins at both ends of the ninth resistor R9 and the corresponding pads; the resistance value of the ninth resistor R9 is detected to obtain an eighth detection result; if the eighth analysis result indicates that one and / or two pins of the ninth resistor R9 are not connected to the corresponding pads, it is determined that the welding of the ninth resistor R9 is abnormal; if the eighth detection result indicates that the resistance value of the ninth resistor R9 exceeds the seventh resistance value standard range, it is determined that the ninth resistor R9 is faulty; if the ninth resistor R9 is normal and the welding of the ninth resistor R9 is normal, it is determined that the third operational amplifier OP3 is faulty.

[0043] Specifically, when it is determined that the differential amplifier circuit 600 is a faulty circuit, it is necessary to check the ninth resistor R9 and the third operational amplifier OP3. First, it is necessary to determine whether the ninth resistor R9 is welded normally, and then determine whether the ninth resistor R9 is faulty. If the ninth resistor R9 is welded normally and the ninth resistor R9 is normal, it is determined that the faulty component is the third operational amplifier OP3.

[0044] By checking the above steps one by one and eliminating the fault of the ninth resistor R9, the circuit can accurately determine that the faulty component is the third operational amplifier OP3, thereby improving the accuracy of locating the faulty component and avoiding blind replacement of components and unnecessary repair of components.

[0045] The digital-to-analog conversion circuit 1000 is introduced below. Figure 2 As shown, Figure 2 Another schematic diagram of the fault detection circuit structure provided by the embodiment of the present application. The above-mentioned RF excitation circuit also includes: a digital-to-analog conversion circuit 1000 and a fourth voltage detection point TP4; the fault circuit also includes a fault circuit; the input end of the digital-to-analog conversion circuit 1000 is connected to the first power supply voltage U1, and the output end of the digital-to-analog conversion circuit 1000 is respectively connected to the fourth voltage detection point TP4 and the sixth contact 6 of the relay 200; the host computer 100 is also used to obtain the voltage value of the fourth voltage detection point TP4; if the voltage value of the fourth voltage detection point TP4 is a nonlinear change, it is determined that the digital-to-analog conversion circuit 1000 is a fault circuit.

[0046] Specifically, the voltage value of the fourth voltage detection point TP4 is the voltage value of the output end of the digital-to-analog conversion circuit 1000. If the voltage value of the fourth voltage detection point TP4 changes linearly, it means that the voltage value of the output end of the digital-to-analog conversion circuit 1000 is normal, so the digital-to-analog conversion circuit 1000 is a non-faulty circuit.

[0047] With such a configuration, the staff can determine whether the voltage value of the fourth voltage detection point TP4 changes linearly, and combine the elimination method to locate the fault of the digital-to-analog conversion circuit 1000, thereby avoiding the staff's misjudgment of the faulty circuit. The circuit improves the staff's judgment accuracy and fault location efficiency of the digital-to-analog conversion circuit 1000.

[0048] The reverse amplifier circuit 300 is described below. Figure 2 As shown, Figure 2Another schematic diagram of the structure of a fault detection circuit provided in an embodiment of the present application. The reverse amplifier circuit 300 includes: a fourth operational amplifier OP4; a first input terminal of the reverse amplifier circuit 300 is connected to the reverse input terminal of the fourth operational amplifier OP4; a second input terminal of the reverse amplifier circuit 300 is connected to the positive input terminal of the fourth operational amplifier OP4; an output terminal of the reverse amplifier circuit 300 is connected to the output terminal of the fourth operational amplifier OP4; and a first output terminal of the fourth operational amplifier OP4 is connected to the first input terminal of the fourth operational amplifier OP4.

[0049] Specifically, when the reverse amplifier circuit 300 is determined to be a faulty circuit, it can be determined that the fourth operational amplifier OP4 is faulty. The fault of the fourth operational amplifier OP4 is caused by aging, damage or other nonlinear factors in the circuit.

[0050] The circuit can accurately determine that the faulty component is the fourth operational amplifier OP4, thereby improving the accuracy of locating the faulty component and avoiding blind replacement of components and unnecessary repair of components.

[0051] On the basis of the above fault detection circuit embodiment, the embodiment of the present invention further provides a fault detection method, which is applied to the fault detection circuit, the circuit comprising: a host computer, a relay, a reverse amplifier circuit and a radio frequency excitation circuit; wherein the radio frequency excitation circuit comprises a plurality of radio frequency excitation sub-circuits; the first contact of the relay is connected to the first input end of the reverse amplifier circuit, the output end of the reverse amplifier circuit is connected to the second contact of the relay, and the second input end of the reverse amplifier circuit is grounded; the third contact of the relay is connected to the first input end of the n-1th radio frequency excitation circuit, the fourth contact of the relay is connected to the first input end of the n-th radio frequency excitation sub-circuit, the fifth contact of the relay is connected to the output end of the n-1th radio frequency excitation sub-circuit, the first input end of the n+1th radio frequency excitation sub-circuit is connected to the output end of the n-th radio frequency excitation sub-circuit, the second input end of each radio frequency excitation sub-circuit is grounded, and the output end of the n-th radio frequency excitation sub-circuit is connected to the n-th voltage detection point; the sixth contact of the relay is connected to the first power supply voltage, the control end of the host computer is connected to the first end of the winding of the relay, and the second end of the winding of the relay is connected to the second power supply voltage; the method comprises the following steps: S101, the host computer obtains the detection current.

[0052] S102: If the detected current is greater than the preset current threshold, the host computer controls the sixth contact of the relay to be connected to the first contact of the relay and the second contact of the relay to be connected to the fourth contact of the relay.

[0053] S103, the host computer obtains the voltage of each voltage detection point.

[0054] S104: If the voltage value of the nth voltage detection point changes nonlinearly and the voltage value of the n-1th voltage detection point changes linearly, the host computer determines that the nth radio frequency excitation sub-circuit is a fault circuit.

[0055] S105, the host computer checks the components of the faulty circuit to determine the target faulty components.

[0056] Preferably, the radio frequency excitation circuit includes: a differential amplifier circuit, an amplitude modulation circuit, a voltage-controlled amplifier circuit or an integral amplifier circuit; the voltage detection point includes: a first voltage detection point, a second voltage detection point or a third voltage detection point; the third contact of the relay is connected to the first end of the first resistor, the second end of the first resistor is respectively connected to the first input end of the integral amplifier circuit and the first end of the second resistor, the output end of the integral amplifier circuit is connected to the fifth contact of the relay, the second end of the second resistor is respectively connected to the first voltage detection point and the output end of the differential amplifier circuit, and the second input end of the integral amplifier circuit is grounded; the first input end of the differential amplifier circuit and the second voltage detection point are commonly connected to the output end of the voltage-controlled amplifier circuit, and the second input end of the differential amplifier circuit is grounded; the first input end of the voltage-controlled amplifier circuit is respectively connected to the output end of the amplitude modulation circuit and the third voltage detection point, the first input end of the amplitude modulation circuit is connected to the fourth contact of the relay, and the second input end of the amplitude modulation circuit is grounded; the upper computer checks the components of the fault circuit and determines the step of the target faulty components, including: The host computer obtains the voltage value of the first voltage detection point, the voltage value of the second voltage detection point and the voltage value of the third voltage detection point; If the voltage value of the first voltage detection point changes linearly, the host computer determines that the integral amplifier circuit is a fault circuit; If the voltage value at the first voltage detection point changes nonlinearly and the voltage value at the second voltage detection point changes linearly, the host computer determines that the differential amplifier circuit is a fault circuit; If the voltage value of the second voltage detection point changes nonlinearly and the voltage value of the third voltage detection point changes linearly, the host computer determines that the voltage-controlled amplifier circuit is a fault circuit; If the voltage value at the third voltage detection point changes nonlinearly, the host computer determines that the amplitude modulation circuit is a fault circuit.

[0057] Preferably, the integration amplifier circuit comprises: a third resistor, a first capacitor and a first operational amplifier; the first input terminal of the integration amplifier circuit is connected to the inverting input terminal of the first operational amplifier, the second input terminal of the integration amplifier circuit is connected to the positive input terminal of the first operational amplifier, and the output terminal of the integration amplifier circuit is connected to the output terminal of the first operational amplifier; the second end of the first resistor is respectively connected to the first end of the third resistor and the inverting input terminal of the first operational amplifier, the second end of the third resistor is connected to the first end of the first capacitor, the second end of the first capacitor is connected to the output terminal of the first operational amplifier, and the positive input terminal of the first operational amplifier is grounded; the method further comprises: The host computer analyzes the first image fed back by the camera to obtain a first analysis result; wherein the first image is an image of the connection points between the pins at both ends of the third resistor and the corresponding pads; The host computer detects the resistance value of the third resistor to obtain a first detection result; If the first analysis result indicates that one and / or two pins of the third resistor are not connected to their respective corresponding pads, the host computer determines that the welding of the third resistor is abnormal; If the first detection result indicates that the resistance value of the third resistor exceeds the first resistance value standard range, the host computer determines that the third resistor is faulty; The host computer analyzes the second image fed back by the camera to obtain a second analysis result; wherein the second image is an image of the connection points between the pins at both ends of the first capacitor and the corresponding pads; The host computer detects the capacitance of the first capacitor to obtain a second detection result; If the second analysis result indicates that one and / or two pins of the first capacitor are not connected to their respective corresponding pads, the host computer determines that welding of the first capacitor is abnormal; If the second detection result indicates that the capacitance of the first capacitor exceeds the first capacitance standard range, the host computer determines that the first capacitor is faulty; If the first capacitor and the third resistor are both welded normally and the first capacitor and the third resistor are both normal, the host computer determines that the first operational amplifier is faulty.

[0058] Preferably, the amplitude modulation circuit comprises: a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor and a second operational amplifier; a first input terminal of the amplitude modulation circuit is connected to the inverting input terminal of the second operational amplifier, a second input terminal of the amplitude modulation circuit is connected to the forward input terminal of the second operational amplifier, and an output terminal of the amplitude modulation circuit is connected to the output terminal of the second operational amplifier; a first terminal of the fourth resistor is connected to a fourth contact of the relay, a first terminal of the fifth resistor is grounded, an inverting input terminal of the second operational amplifier is respectively connected to the second terminal of the fourth resistor and the first terminal of the sixth resistor, a forward input terminal of the second operational amplifier is connected to the second terminal of the fifth resistor, an output terminal of the second operational amplifier is connected to the first terminal of the seventh resistor, a second terminal of the seventh resistor is connected to the first terminal of the eighth resistor, and a second terminal of the eighth resistor is respectively connected to the second terminal of the fifth resistor and the forward input terminal of the second operational amplifier; the method further comprises: The host computer analyzes the third image fed back by the camera to obtain a third analysis result; wherein the third image is an image of the connection points between the pins at both ends of the fourth resistor and the corresponding pads; The host computer detects the resistance value of the fourth resistor to obtain a third detection result; If the third analysis result indicates that one and / or two pins of the fourth resistor are not connected to their respective corresponding pads, the host computer determines that the welding of the fourth resistor is abnormal; If the third detection result indicates that the resistance value of the fourth resistor exceeds the second resistance standard range, the host computer determines that the fourth resistor is faulty; The host computer analyzes the fourth image fed back by the camera to obtain a fourth analysis result; wherein the fourth image is an image of the connection points between the pins at both ends of the fifth resistor and the corresponding pads; The host computer detects the resistance value of the fifth resistor to obtain a fourth detection result; If the fourth analysis result indicates that one and / or two pins of the fifth resistor are not connected to their respective corresponding pads, the host computer determines that the welding of the fifth resistor is abnormal; If the fourth detection result indicates that the resistance value of the fifth resistor exceeds the third resistance value standard range, the host computer determines that the fifth resistor is faulty; The host computer analyzes the fifth image fed back by the camera to obtain a fifth analysis result; wherein the fifth image is an image of the connection points between the pins at both ends of the sixth resistor and the corresponding pads; The host computer detects the resistance value of the sixth resistor to obtain a fifth detection result; If the fifth analysis result indicates that one and / or two pins of the sixth resistor are not connected to their respective corresponding pads, the host computer determines that the welding of the sixth resistor is abnormal; If the fifth detection result indicates that the resistance value of the sixth resistor exceeds the fourth resistance value standard range, the host computer determines that the sixth resistor is faulty; The host computer analyzes the sixth image fed back by the camera to obtain a sixth analysis result; wherein the sixth image is an image of the connection points between the pins at both ends of the seventh resistor and the corresponding pads; The host computer detects the resistance value of the seventh resistor to obtain a sixth detection result; If the sixth analysis result indicates that one and / or two pins of the seventh resistor are not connected to their respective corresponding pads, the host computer determines that the seventh resistor is abnormally welded; If the sixth detection result indicates that the resistance value of the seventh resistor exceeds the fifth resistance value standard range, the host computer determines that the seventh resistor is faulty; The host computer analyzes the seventh image fed back by the camera to obtain a seventh analysis result; wherein the seventh image is an image of the connection points between the pins at both ends of the eighth resistor and the corresponding pads; The host computer detects the resistance value of the eighth resistor to obtain a seventh detection result; If the seventh analysis result indicates that one and / or two pins of the eighth resistor are not connected to their corresponding pads, the host computer determines that the eighth resistor is abnormally welded; If the seventh detection result indicates that the resistance value of the eighth resistor exceeds the sixth resistance value standard range, the host computer determines that the eighth resistor is faulty; If the fourth resistor, the fifth resistor, the sixth resistor, the seventh resistor and the eighth resistor are all normal and the fourth resistor, the fifth resistor, the sixth resistor, the seventh resistor and the eighth resistor are all welded normally, the host computer determines that the second operational amplifier is faulty.

[0059] Preferably, the differential amplifier circuit comprises: a ninth resistor and a third operational amplifier; the first input terminal of the differential amplifier circuit is respectively connected to the reverse input terminal and the forward input terminal of the third operational amplifier, the second input terminal of the differential amplifier circuit is connected to the ground terminal of the third operational amplifier, and the output terminal of the differential amplifier circuit is connected to the output terminal of the third operational amplifier; the first terminal of the ninth resistor is connected to the first terminal of the third operational amplifier, and the second terminal of the ninth resistor is connected to the second terminal of the third operational amplifier; the method further comprises: The host computer analyzes the eighth image fed back by the camera to obtain an eighth analysis result; wherein the eighth image is an image of the connection points between the pins at both ends of the ninth resistor and the corresponding pads; The host computer detects the resistance value of the ninth resistor to obtain an eighth detection result; If the eighth analysis result indicates that one and / or two pins of the ninth resistor are not connected to their corresponding pads, the host computer determines that the ninth resistor is abnormally welded; If the eighth detection result indicates that the resistance value of the ninth resistor exceeds the seventh resistance standard range, the host computer determines that the ninth resistor is faulty; If the ninth resistor is normal and the ninth resistor is welded normally, the host computer determines that the third operational amplifier is faulty.

[0060] Preferably, the method further includes: if the detected current is less than or equal to a preset current threshold, the host computer controls the sixth contact of the relay to be connected to the third contact of the relay and the fourth contact of the relay to be connected to the fifth contact of the relay.

[0061] Preferably, the RF excitation circuit further includes: a digital-to-analog conversion circuit and a fourth voltage detection point; the input end of the digital-to-analog conversion circuit is connected to the first power supply voltage, and the output end of the digital-to-analog conversion circuit is respectively connected to the fourth voltage detection point and the sixth contact of the relay; the method further includes: The host computer obtains the voltage value of the fourth voltage detection point; If the voltage value at the fourth voltage detection point changes nonlinearly, the host computer determines that the digital-to-analog conversion circuit is a fault circuit.

[0062] Preferably, the reverse amplification circuit includes: a fourth operational amplifier; a first input terminal of the reverse amplification circuit is connected to the reverse input terminal of the fourth operational amplifier, a second input terminal of the reverse amplification circuit is connected to the positive input terminal of the fourth operational amplifier, and an output terminal of the reverse amplification circuit is connected to the output terminal of the fourth operational amplifier; and a fourth output terminal of the fourth operational amplifier is connected to the first input terminal of the fourth operational amplifier.

[0063] Preferably, the method further includes: if the detected current is less than or equal to a preset current threshold, the host computer controls the sixth contact of the relay to be connected to the third contact of the relay and the fourth contact of the relay to be connected to the fifth contact of the relay.

[0064] The fault detection method provided in the embodiment of the present invention has the same technical features as the fault detection circuit provided in the above embodiment, so it can also solve the same technical problems and achieve the same technical effects.

[0065] The descriptions of the structures corresponding to the above-mentioned figures have different emphases. For parts not described in detail in a certain structure, reference can be made to the relevant descriptions of other structures.

[0066] The above description is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present application should be included in the protection scope of the present application.

Claims

1. A fault detection circuit, characterized in that: The circuit includes: a host computer, a relay, a reverse amplifier circuit and a radio frequency excitation circuit; wherein the radio frequency excitation circuit includes a plurality of radio frequency excitation sub-circuits; The first contact of the relay is connected to the first input terminal of the reverse amplifier circuit, the output terminal of the reverse amplifier circuit is connected to the second contact of the relay, and the second input terminal of the reverse amplifier circuit is grounded; The third contact of the relay is connected to the first input terminal of the n-1th RF excitation circuit, the fourth contact of the relay is connected to the first input terminal of the n-1th RF excitation sub-circuit, the fifth contact of the relay is connected to the output terminal of the n-1th RF excitation sub-circuit, the first input terminal of the n+1th RF excitation sub-circuit is connected to the output terminal of the n-1th RF excitation sub-circuit, the second input terminal of each RF excitation sub-circuit is grounded, and the output terminal of the n-th RF excitation sub-circuit is connected to the n-th voltage detection point; The sixth contact of the relay is connected to the first power supply voltage, the control end of the host computer is connected to the first end of the winding of the relay, and the second end of the winding of the relay is connected to the second power supply voltage; The host computer is used to obtain the detection current; if the detection current is greater than the preset current threshold, the sixth contact of the relay is controlled to be connected to the first contact of the relay and the second contact of the relay is connected to the fourth contact of the relay; the voltage of each voltage detection point is obtained; if the voltage value of the nth voltage detection point changes nonlinearly and the voltage value of the n-1th voltage detection point changes linearly, the nth RF excitation sub-circuit is determined to be a fault circuit; the components of the fault circuit are checked to determine the target faulty components.

2. The fault detection circuit according to claim 1, characterized in that: The radio frequency excitation circuit includes: a differential amplifier circuit, an amplitude modulation circuit, a voltage-controlled amplifier circuit or an integral amplifier circuit; the voltage detection point includes: a first voltage detection point, a second voltage detection point or a third voltage detection point; The third contact of the relay is connected to the first end of the first resistor, the second end of the first resistor is respectively connected to the first input end of the integral amplifier circuit and the first end of the second resistor, the output end of the integral amplifier circuit is connected to the fifth contact of the relay, the second end of the second resistor is respectively connected to the first voltage detection point and the output end of the differential amplifier circuit, and the second input end of the integral amplifier circuit is grounded; The first input terminal of the differential amplifier circuit and the second voltage detection point are commonly connected to the output terminal of the voltage-controlled amplifier circuit, and the second input terminal of the differential amplifier circuit is grounded; The first input end of the voltage-controlled amplifier circuit is respectively connected to the output end of the amplitude modulation circuit and the third voltage detection point, the first input end of the amplitude modulation circuit is connected to the fourth contact of the relay, and the second input end of the amplitude modulation circuit is grounded; The host computer is specifically used to obtain the voltage value of the first voltage detection point, the voltage value of the second voltage detection point and the voltage value of the third voltage detection point; if the voltage value of the first voltage detection point changes linearly, the integral amplifier circuit is determined to be the fault circuit; if the voltage value of the first voltage detection point changes nonlinearly and the voltage value of the second voltage detection point changes linearly, the differential amplifier circuit is determined to be the fault circuit; if the voltage value of the second voltage detection point changes nonlinearly and the voltage value of the third voltage detection point changes linearly, the voltage-controlled amplifier circuit is determined to be the fault circuit; if the voltage value of the third voltage detection point changes nonlinearly, the amplitude modulation circuit is determined to be the fault circuit.

3. The fault detection circuit according to claim 2, characterized in that: The integral amplifier circuit comprises: a third resistor, a first capacitor and a first operational amplifier; The first input terminal of the integrating amplifier circuit is connected to the inverting input terminal of the first operational amplifier, the second input terminal of the integrating amplifier circuit is connected to the positive input terminal of the first operational amplifier, and the output terminal of the integrating amplifier circuit is connected to the output terminal of the first operational amplifier; The second end of the first resistor is connected to the first end of the third resistor and the inverting input end of the first operational amplifier respectively, the second end of the third resistor is connected to the first end of the first capacitor, the second end of the first capacitor is connected to the output end of the first operational amplifier, and the positive input end of the first operational amplifier is grounded; The host computer is further used to analyze the first image fed back by the camera to obtain a first analysis result; wherein the first image is an image of the connection points between the pins at both ends of the third resistor and the corresponding pads; the resistance value of the third resistor is detected to obtain a first detection result; if the first analysis result indicates that one and / or two pins of the third resistor are not connected to the corresponding pads, the welding of the third resistor is determined to be abnormal; if the first detection result indicates that the resistance value of the third resistor exceeds the first resistance standard range, the third resistor is determined to be faulty; the second image fed back by the camera is analyzed to obtain a second analysis result; wherein the second image is an image of the connection points between the pins at both ends of the first capacitor and the corresponding pads; the capacitance of the first capacitor is detected to obtain a second detection result; if the second analysis result indicates that one and / or two pins of the first capacitor are not connected to the corresponding pads, the welding of the first capacitor is determined to be abnormal; if the second detection result indicates that the capacitance value of the first capacitor exceeds the first capacitance standard range, the first capacitor is determined to be faulty; if the first capacitor and the third resistor are both welded normally and the first capacitor and the third resistor are both normal, the first operational amplifier is determined to be faulty.

4. The fault detection circuit according to claim 2, characterized in that: The amplitude modulation circuit comprises: a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor and a second operational amplifier; The first input terminal of the amplitude modulation circuit is connected to the inverting input terminal of the second operational amplifier, the second input terminal of the amplitude modulation circuit is connected to the positive input terminal of the second operational amplifier, and the output terminal of the amplitude modulation circuit is connected to the output terminal of the second operational amplifier; The first end of the fourth resistor is connected to the fourth contact of the relay, the first end of the fifth resistor is grounded, the inverting input end of the second operational amplifier is respectively connected to the second end of the fourth resistor and the first end of the sixth resistor, the positive input end of the second operational amplifier is connected to the second end of the fifth resistor, the output end of the second operational amplifier is connected to the first end of the seventh resistor, the second end of the seventh resistor is connected to the first end of the eighth resistor, and the second end of the eighth resistor is respectively connected to the second end of the fifth resistor and the positive input end of the second operational amplifier. The host computer is further used to analyze the third image fed back by the camera to obtain a third analysis result; wherein the third image is an image of the connection points between the pins at both ends of the fourth resistor and the corresponding pads; the resistance value of the fourth resistor is detected to obtain a third detection result; if the third analysis result indicates that one and / or two pins of the fourth resistor are not connected to the corresponding pads, it is determined that the welding of the fourth resistor is abnormal; if the third detection result indicates that the resistance value of the fourth resistor exceeds the second resistance standard range, it is determined that the fourth resistor is faulty; the fourth image fed back by the camera is analyzed to obtain a fourth analysis result; wherein the fourth image is the fifth An image of the connection points between the pins at both ends of the resistor and their corresponding pads; the resistance value of the fifth resistor is detected to obtain a fourth detection result; if the fourth analysis result indicates that one and / or two pins of the fifth resistor are not connected to their corresponding pads, it is determined that the welding of the fifth resistor is abnormal; if the fourth detection result indicates that the resistance value of the fifth resistor exceeds the third resistance standard range, it is determined that the fifth resistor is faulty; the fifth image fed back by the camera is analyzed to obtain a fifth analysis result; wherein the fifth image is an image of the connection points between the pins at both ends of the sixth resistor and their corresponding pads; the resistance value of the sixth resistor is detected to obtain a fifth detection result; if The fifth analysis result indicates that one and / or two pins of the sixth resistor are not connected to their corresponding pads, and the sixth resistor is determined to be abnormally welded; if the fifth detection result indicates that the resistance of the sixth resistor exceeds the fourth resistance standard range, the sixth resistor is determined to be faulty; the sixth image fed back by the camera is analyzed to obtain the sixth analysis result; wherein the sixth image is an image of the connection points between the pins at both ends of the seventh resistor and their corresponding pads; the resistance of the seventh resistor is detected to obtain the sixth detection result; if the sixth analysis result indicates that one and / or two pins of the seventh resistor are not connected to their corresponding pads, the seventh resistor is determined to be Welding abnormality; if the sixth detection result indicates that the resistance value of the seventh resistor exceeds the fifth resistance value standard range, the seventh resistor is determined to be faulty; the seventh image fed back by the camera is analyzed to obtain a seventh analysis result; wherein the seventh image is an image of the connection points between the pins at both ends of the eighth resistor and the corresponding pads; the resistance value of the eighth resistor is detected to obtain the seventh detection result; if the seventh analysis result indicates that one and / or two pins of the eighth resistor are not connected to the corresponding pads, the eighth resistor is determined to be welded abnormally; if the seventh detection result indicates that the resistance value of the eighth resistor exceeds the sixth resistance value standard range, the eighth resistor is determined to be faulty;If the fourth resistor, the fifth resistor, the sixth resistor, the seventh resistor and the eighth resistor are all normal and the fourth resistor, the fifth resistor, the sixth resistor, the seventh resistor and the eighth resistor are all welded normally, it is determined that the second operational amplifier is faulty. ; 5. The fault detection circuit according to claim 2, characterized in that: The differential amplifier circuit comprises: a ninth resistor and a third operational amplifier; The first input terminal of the differential amplifier circuit is respectively connected to the inverting input terminal and the positive input terminal of the third operational amplifier, the second input terminal of the differential amplifier circuit is connected to the ground terminal of the third operational amplifier, and the output terminal of the differential amplifier circuit is connected to the output terminal of the third operational amplifier; The first end of the ninth resistor is connected to the first end of the third operational amplifier, and the second end of the ninth resistor is connected to the second end of the third operational amplifier; The host computer is also used to analyze the eighth image fed back by the camera to obtain an eighth analysis result; wherein the eighth image is an image of the connection points between the pins at both ends of the ninth resistor and their corresponding pads; the resistance value of the ninth resistor is detected to obtain an eighth detection result; if the eighth analysis result indicates that one and / or two pins of the ninth resistor are not connected to their corresponding pads, it is determined that the welding of the ninth resistor is abnormal; if the eighth detection result indicates that the resistance value of the ninth resistor exceeds the seventh resistance standard range, it is determined that the ninth resistor is faulty; if the ninth resistor is normal and the ninth resistor is welded normally, it is determined that the third operational amplifier is faulty.

6. The fault detection circuit according to claim 1, characterized in that: The host computer is also used to control the sixth contact of the relay to be connected to the third contact of the relay and the fourth contact of the relay to be connected to the fifth contact of the relay if the detected current is less than or equal to the preset current threshold.

7. The fault detection circuit according to claim 3, characterized in that: The radio frequency excitation circuit further includes: a digital-to-analog conversion circuit and a fourth voltage detection point; The input end of the digital-to-analog conversion circuit is connected to the first power supply voltage, and the output end of the digital-to-analog conversion circuit is respectively connected to the fourth voltage detection point and the sixth contact of the relay; The host computer is further used to obtain the voltage value of the fourth voltage detection point; if the voltage value of the fourth voltage detection point changes nonlinearly, it is determined that the digital-to-analog conversion circuit is the fault circuit.

8. The fault detection circuit according to claim 1, characterized in that: The reverse amplification circuit comprises: a fourth operational amplifier; The first input terminal of the reverse amplifier circuit is connected to the reverse input terminal of the fourth operational amplifier, the second input terminal of the reverse amplifier circuit is connected to the positive input terminal of the fourth operational amplifier, and the output terminal of the reverse amplifier circuit is connected to the output terminal of the fourth operational amplifier; The first output terminal of the fourth operational amplifier is connected to the first input terminal of the fourth operational amplifier.

9. A fault detection method, characterized in that: Applied to the fault detection circuit, the circuit includes: a host computer, a relay, a reverse amplifier circuit and a radio frequency excitation circuit; wherein the radio frequency excitation circuit includes a plurality of radio frequency excitation sub-circuits; the first contact of the relay is connected to the first input end of the reverse amplifier circuit, the output end of the reverse amplifier circuit is connected to the second contact of the relay, and the second input end of the reverse amplifier circuit is grounded; the third contact of the relay is connected to the first input end of the n-1th radio frequency excitation circuit, the fourth contact of the relay is connected to the first input end of the n-th radio frequency excitation sub-circuit, the fifth contact of the relay is connected to the output end of the n-1th radio frequency excitation sub-circuit, the first input end of the n+1th radio frequency excitation sub-circuit is connected to the output end of the n-th radio frequency excitation sub-circuit, the second input end of each radio frequency excitation sub-circuit is grounded, and the output end of the n-th radio frequency excitation sub-circuit is connected to the n-th voltage detection point; the sixth contact of the relay is connected to the first power supply voltage, the control end of the host computer is connected to the first end of the winding of the relay, and the second end of the winding of the relay is connected to the second power supply voltage; the method includes: The host computer obtains the detection current; If the detected current is greater than the preset current threshold, the host computer controls the sixth contact of the relay to be connected to the first contact of the relay and the second contact of the relay to be connected to the fourth contact of the relay; The host computer obtains the voltage of each voltage detection point; If the voltage value of the nth voltage detection point changes nonlinearly and the voltage value of the n-1th voltage detection point changes linearly, the host computer determines that the nth radio frequency excitation subcircuit is a fault circuit; The host computer checks the components of the faulty circuit to determine the target faulty components.

10. The fault detection method according to claim 9, characterized in that: The method further comprises: If the detected current is less than or equal to the preset current threshold, the host computer controls the sixth contact of the relay to be connected to the third contact of the relay and the fourth contact of the relay to be connected to the fifth contact of the relay.

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