A high voltage protection circuit for mass spectrometer detector

Abstract

The present invention discloses a high-voltage protection circuit for a mass spectrometer detector, comprising: a control unit, a high-voltage direct current source module, a high-voltage setting component, a switch control component, and a feedback component, wherein the feedback component feeds back the communication state of the high-voltage direct current source module to the control unit and transmits it to the control unit, and the control unit determines whether the overall circuit is in a normal state, and further controls the switch control component to power the high-voltage direct current source module, and at the same time, the high-voltage setting component controls the high-voltage direct current source to output a predetermined high-voltage value and transmits it to the high-voltage direct current source; the present invention adopts the judgment of the working state of the circuit, and controls the switch circuit to power on and off the detector, so as to ensure that the detector has voltage during operation and avoid long-term irrelevant loss, and at the same time, by setting the maximum protection voltage, the detector is prevented from carrying excessively high voltage, thereby further protecting the detector and improving the service life.

Description

Technical Field

[0001] The invention belongs to the field of mass spectrometers, and in particular relates to a high-voltage protection circuit for a mass spectrometer detector. Background Art

[0002] The mass spectrometer is mainly composed of an injection system, an ion source, ion introduction and ion transmission, a mass analyzer, and a detector, and is supplemented by an electrical system and a vacuum system to ensure the normal operation of the instrument. In an inductively coupled plasma mass spectrometer, the types and contents of trace elements in the sample must be detected. After the sample is introduced through the injection system, it enters the ionization system in a high vacuum state for ionization. The conventional ionization method is electron ionization, also known as electron bombardment. It uses the thermal electrons generated when the filament is heated to interact with organic molecules in the gas phase, causing the molecules to lose valence electrons and ionize into positively charged molecular ions. If the internal energy of the molecular ion is large, chemical bonds may break, generating fragment ions with a smaller m / Z. These ions and fragments enter the mass analyzer under the guidance of the electromagnetic field. The movement properties of ions in the magnetic field or electric field can be used to separate ions with different mass-to-charge ratios. The detector then measures the intensity of the ion flow to obtain a specific mass spectrum. The mass spectrum will be different for different molecular structures. Qualitative and structural analysis can be performed based on the position of the peak, and the intensity of the peak is proportional to the number of ions, thereby obtaining quantitative information of the sample.

[0003] After the mass analyzer screens out the required ion signals, these ions enter the detector at high speed. In the detector, the positively charged signal ions are converted into electron flow. The pulse signal output after amplification by the detector is received and amplified by the detector signal acquisition and amplifier circuit, and converted into a square wave pulse signal that is easily detected by the MCU. One pulse is a count value, and the size of the count value is proportional to the number of charged ions output by the mass analyzer. Theoretically, there is one count value for one charged ion, but because the ion flow entering the detector is very fast and the detector itself has dead time limitations, the detected charged ions and count values ​​are often not one-to-one corresponding, but multiple ions correspond to one pulse count. After the MCU module obtains the required count value, it transmits this data to the host computer for the host computer to display the spectrum, and the host computer performs appropriate background subtraction settings as needed.

[0004] In actual detection, there will be a certain signal-to-noise ratio. If it is too large, it will directly affect the presentation of the signal spectrum. In addition, directly applying thousands of volts of high voltage to the detector will accelerate the loss of the detector. Exceeding the maximum voltage of the detector will directly make the detector scrapped. Therefore, it is necessary to find a technical solution or method that can solve the above problems. Summary of the invention

[0005] In view of this, it is necessary to overcome at least one of the above-mentioned defects in the prior art. The present invention provides a high-voltage protection circuit for a mass spectrometer detector, including a control unit, a high-voltage direct current source module, a high-voltage setting component for controlling the high-voltage direct current source to output a predetermined high voltage and connected to the control unit, a switch control component for controlling the power supply to the high-voltage direct current source module, and a feedback component for feeding back the communication state of the high-voltage direct current source module to the control unit, the feedback component feeds back the communication state of the high-voltage direct current source module to the control unit and transmits it to the control unit, the control unit determines whether the overall circuit is in a normal state, and then controls the switch control component to power the high-voltage direct current source module, and at the same time, the high-voltage setting component controls the high-voltage direct current source to output a predetermined high voltage value and transmits it to the high-voltage direct current source, if the control unit determines that the overall circuit is normal, then the voltage input to the detector is a normal value, if the control unit determines that the overall circuit is abnormal or not working, then the voltage input to the detector is 0.

[0006] According to the prior art described in the background technology of this patent, in actual detection, there will be a certain signal-to-noise ratio. If it is too large, it will directly affect the presentation of the signal spectrum, and directly applying thousands of volts of high voltage to the detector will accelerate the loss of the detector. Exceeding the maximum voltage of the detector will directly scrap the detector. The high-voltage protection circuit of the mass spectrometer detector disclosed in the present invention judges the working state of the circuit and powers on and off the detector by controlling the switch circuit, ensuring that the detector can only have voltage during operation, avoiding long-term irrelevant losses. At the same time, by setting the maximum protection voltage, the detector can be prevented from carrying too high a voltage, further protecting the detector and improving its service life.

[0007] In addition, the rotating structure for a multi-collimator disclosed in the present invention also has the following additional technical features:

[0008] Furthermore, the high-voltage DC source module includes a positive high-voltage DC source module and a negative high-voltage DC source module;

[0009] The positive high voltage DC source module status:

[0010] The control unit transmits the predetermined positive high voltage output by the high-voltage DC source to the high-voltage setting component and further transmits it to the positive high-voltage DC source module for outputting a preset voltage to the positive power supply terminal of the detector; at the same time, the control unit judges the working state signal transmitted by the positive high-voltage DC source from the feedback component, and if it is normal, controls the switch control component to start supplying power to the positive high-voltage DC source, and if it is abnormal or not working, cuts off the power;

[0011] The negative high voltage DC source module status:

[0012] The control unit transmits the predetermined negative high voltage output by the high-voltage DC source to the high-voltage setting component and further transmits it to the negative high-voltage DC source module for outputting a preset voltage to the negative power supply terminal of the detector; at the same time, the control unit judges the working status signal transmitted by the negative high-voltage DC source from the feedback component, and if it is normal, controls the switch control component to start supplying power to the negative high-voltage DC source; if it is abnormal or not working, the power is cut off.

[0013] Furthermore, the high voltage setting component includes a high voltage setting digital-to-analog conversion unit and a high voltage setting signal conditioning unit, the high voltage setting digital-to-analog conversion unit is connected to the control unit and converts the preset target voltage value signal and transmits it to the high voltage setting signal conditioning unit, and the conditioned voltage value is transmitted to the high voltage DC source to be output to the detector voltage terminal;

[0014] Furthermore, the switch control assembly includes a switch circuit connected to the control unit for controlling a solid-state relay, a solid-state relay controlled by the switch circuit, and a power supply component for controlling the solid-state relay.

[0015] Furthermore, the feedback component includes a feedback signal conditioning unit for conditioning the signal from the high voltage DC source and a feedback analog-to-digital conversion unit for performing analog-to-digital conversion on the feedback signal and transmitting it to the control unit, thereby determining the circuit working condition.

[0016] Furthermore, the protection circuit also includes a host computer and a communication unit for communicating between the control unit and the host computer.

[0017] Preferably, the host computer is provided with a maximum protection voltage, and the setting of the maximum protection voltage can make the voltage input to the detector not exceed this protection voltage, thereby further ensuring the protection of the detector.

[0018] The high-voltage DC source involved in this case includes a feedback pin (FB), a setting pin (VREF), a power supply end (VIN), and a high-voltage end (HV). The feedback pin is connected to the feedback component, the setting pin is connected to the high-voltage setting component, the power supply end is connected to the switch control component, and the high-voltage end is connected to the high-voltage terminal of the detector. If the high-voltage DC source is a positive high-voltage DC source, the high-voltage end is a positive high-voltage end, which is connected to the positive high-voltage terminal of the detector. If the high-voltage DC source is a negative high-voltage DC source, the high-voltage end is a negative high-voltage end, which is connected to the negative high-voltage terminal of the detector.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0021] Figure 1 is a principle block diagram of a positive high voltage protection circuit according to the present invention;

[0022] Figure 2 is a principle block diagram of a negative high voltage protection circuit according to the present invention;

[0023] Figure 1 Among them, 1 host computer, 2 high voltage setting component, 21 high voltage setting digital-to-analog conversion unit, 22 high voltage setting signal conditioning unit, 3 feedback component, 31 feedback analog-to-digital conversion unit, 32 feedback signal conditioning unit, 4 communication unit, 5 high voltage DC source, 51 positive high voltage DC source, 52 negative high voltage DC source, 6 detector terminal, 61 detector positive voltage terminal, 62 detector negative voltage terminal, 7 switch control component, 71 switch circuit, 72 solid state relay. DETAILED DESCRIPTION

[0024] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be interpreted as limiting the present invention.

[0025] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "bottom", "top", "front", "back", "inside", "outside", "horizontal", "vertical", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly stipulated and limited, the terms "connection", "communication", "connected", "connection" and "fitting" should be understood in a broad sense. For example, it can be a fixed connection, an integral connection, or a detachable connection; it can be the internal communication of two elements; it can be directly connected or indirectly connected through an intermediate medium; "fitting" can be the fit between surfaces, or the fit between points and surfaces or lines and surfaces, and also includes the fit between holes and axes. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] The inventive concept of the present invention is as follows: by judging the working state of the circuit and controlling the switch circuit to power on and off the detector, it is ensured that the detector only has voltage during operation, avoiding long-term irrelevant losses. At the same time, by setting the maximum protection voltage, the detector can be prevented from carrying too high a voltage, further protecting the detector and increasing its service life.

[0028] The following will describe the alignment device for bonding steel sheets of the present invention with reference to the accompanying drawings, wherein Figure 1 is a principle block diagram of a positive high voltage protection circuit according to the present invention; Figure 2 4 is a principle block diagram of a negative high voltage protection circuit according to the present invention.

[0029] According to an embodiment of the present invention, Figure 1 , 2 As shown, the high-voltage protection circuit disclosed in the present invention includes a control unit, a high-voltage direct current source module, a high-voltage setting component connected to the control unit for controlling the high-voltage direct current source to output a predetermined high voltage, a switch control component for controlling the power supply to the high-voltage direct current source module, and a feedback component for feeding back the communication state of the high-voltage direct current source module to the control unit, wherein the feedback component feeds back the communication state of the high-voltage direct current source module to the control unit and transmits it to the control unit, and the control unit determines whether the overall circuit is in a normal state, and then controls the switch control component to power the high-voltage direct current source module, and at the same time, the high-voltage setting component controls the high-voltage direct current source to output a predetermined high voltage value and transmits it to the high-voltage direct current source, if the control unit determines that the overall circuit is normal, the voltage input to the detector is a normal value, and if the control unit determines that the overall circuit is abnormal or not working, the voltage input to the detector is 0.

[0030] In addition, the rotating structure for a multi-collimator disclosed in the present invention also has the following additional technical features:

[0031] According to some embodiments of the present invention, the high-voltage DC source module includes a positive high-voltage DC source module and a negative high-voltage DC source module;

[0032] The positive high voltage DC source module status:

[0033] The control unit transmits the predetermined positive high voltage output by the high-voltage DC source to the high-voltage setting component and further transmits it to the positive high-voltage DC source module for outputting a preset voltage to the positive power supply terminal of the detector; at the same time, the control unit judges the working state signal transmitted by the positive high-voltage DC source from the feedback component, and if it is normal, controls the switch control component to start supplying power to the positive high-voltage DC source, and if it is abnormal or not working, cuts off the power;

[0034] The negative high voltage DC source module status:

[0035] The control unit transmits the predetermined negative high voltage output by the high-voltage DC source to the high-voltage setting component and further transmits it to the negative high-voltage DC source module for outputting a preset voltage to the negative power supply terminal of the detector; at the same time, the control unit judges the working status signal transmitted by the negative high-voltage DC source from the feedback component, and if it is normal, controls the switch control component to start supplying power to the negative high-voltage DC source; if it is abnormal or not working, the power is cut off.

[0036] According to one embodiment of the present invention, the high-voltage setting component includes a high-voltage setting digital-to-analog conversion unit and a high-voltage setting signal conditioning unit, the high-voltage setting digital-to-analog conversion unit is connected to the control unit and converts a preset target voltage value signal and transmits it to the high-voltage setting signal conditioning unit, the conditioned voltage value is transmitted to the high-voltage DC source to be output to the detector voltage terminal, and the high-voltage setting signal conditioning unit transmits the preset high-voltage value to the setting pin of the high-voltage DC source;

[0037] According to one embodiment of the present invention, the switch control assembly includes a switch circuit connected to the control unit for controlling a solid-state relay, a solid-state relay controlled by the switch circuit, and a power supply component for controlling the solid-state relay.

[0038] According to one embodiment of the present invention, the feedback component includes a feedback signal conditioning unit for conditioning the feedback signal from the high-voltage DC source and a feedback analog-to-digital conversion unit for performing analog-to-digital conversion on the feedback signal and transmitting it to the control unit, thereby determining the circuit working condition.

[0039] According to some embodiments of the present invention, the protection circuit further includes a host computer and a communication unit for communicating between the control unit and the host computer.

[0040] Preferably, the host computer is provided with a maximum protection voltage, and the setting of the maximum protection voltage can make the voltage input to the detector not exceed this protection voltage, thereby further ensuring the protection of the detector.

[0041] The high-voltage DC source involved in this case includes a feedback pin (FB), a setting pin (VREF), a power supply end (VIN), and a high-voltage end (HV). The feedback pin is connected to the feedback component, the setting pin is connected to the high-voltage setting component, the power supply end is connected to the switch control component, and the high-voltage end is connected to the high-voltage terminal of the detector. If the high-voltage DC source is a positive high-voltage DC source, the high-voltage end is a positive high-voltage end, which is connected to the positive high-voltage terminal of the detector. If the high-voltage DC source is a negative high-voltage DC source, the high-voltage end is a negative high-voltage end, which is connected to the negative high-voltage terminal of the detector.

[0042] Any reference to "one embodiment," "an embodiment," "an illustrative embodiment," etc., means that a specific component, structure, or feature described in connection with the embodiment is included in at least one embodiment of the present invention. Such illustrative expressions throughout this specification do not necessarily refer to the same embodiment. Moreover, when a specific component, structure, or feature is described in connection with any embodiment, it is claimed that it is within the scope of those skilled in the art to implement such component, structure, or feature in connection with other embodiments.

[0043] Although specific embodiments of the present invention have been described in detail with reference to a number of illustrative embodiments of the present invention, it must be understood that a variety of other modifications and embodiments may be devised by those skilled in the art that will fall within the spirit and scope of the principles of the present invention. Specifically, within the scope of the foregoing disclosure, the accompanying drawings, and the claims, reasonable variations and improvements may be made in the arrangement of components and / or dependent combinations without departing from the spirit of the present invention. Except for variations and improvements in components and / or arrangement, the scope is defined by the appended claims and their equivalents.

Claims

1. A mass spectrometer detector high voltage protection circuit, characterized in that , including a control unit, a high-voltage DC source module, a high-voltage setting component for controlling the high-voltage DC source to output a predetermined high voltage and connected to the control unit, a switch control component for controlling the power supply to the high-voltage DC source module, and a feedback component for feeding back the communication status of the high-voltage DC source module to the control unit, the feedback component feeds back the communication status of the high-voltage DC source module to the control unit, the control unit determines whether the overall circuit is in a normal state, and then controls the switch control component to power the high-voltage DC source module, and at the same time, the high-voltage setting component controls the high-voltage DC source to output a predetermined high-voltage value signal to the detector, if the control unit determines that the overall circuit is normal, then the voltage input to the detector is a normal value, if the control unit determines that the overall circuit is abnormal or not working, then the voltage input to the detector is 0; The high-voltage DC source module includes a positive high-voltage DC source module and a negative high-voltage DC source module; the positive high-voltage DC source module state: The control unit transmits the predetermined positive high voltage output by the high-voltage DC source module to the high-voltage setting component, and further transmits it to the positive high-voltage DC source module, so as to output a preset voltage to the positive power supply terminal of the detector; at the same time, the control unit judges the working state signal transmitted by the positive high-voltage DC source module from the feedback component, and if it is normal, controls the switch control component to start supplying power to the positive high-voltage DC source module, and if it is abnormal or not working, cuts off the power; The negative high voltage DC source module status: The control unit transmits the predetermined negative high voltage output by the high-voltage DC source module to the high-voltage setting component, and further transmits it to the negative high-voltage DC source module, for outputting a preset voltage to the negative power supply terminal of the detector; at the same time, the control unit judges the working status signal transmitted by the negative high-voltage DC source module from the feedback component, and if it is normal, controls the switch control component to start supplying power to the negative high-voltage DC source module, and if it is abnormal or not working, cuts off the power.

2. The mass spectrometer detector high voltage protection circuit according to claim 1, characterized in that: The high-voltage setting component includes a high-voltage setting digital-to-analog conversion unit and a high-voltage setting signal conditioning unit. The high-voltage setting digital-to-analog conversion unit is connected to the control unit and converts the preset target voltage value signal and transmits it to the high-voltage setting signal conditioning unit. The conditioned voltage value is transmitted to the high-voltage DC source module to be output to the detector voltage terminal.

3. The mass spectrometer detector high voltage protection circuit according to claim 1, characterized in that: The switch control assembly includes a switch circuit connected to the control unit for controlling a solid-state relay, a solid-state relay controlled by the switch circuit, and a power supply component for controlling the solid-state relay.

4. The mass spectrometer detector high voltage protection circuit according to claim 1, characterized in that: The feedback component includes a feedback signal conditioning unit for conditioning the signal from the high-voltage DC source module and a feedback analog-to-digital conversion unit for performing analog-to-digital conversion on the feedback signal and transmitting it to the control unit, thereby determining the circuit working status.

5. The mass spectrometer detector high voltage protection circuit according to claim 1, characterized in that: The protection circuit further includes a host computer and a communication unit for communicating between the control unit and the host computer.

6. The mass spectrometer detector high voltage protection circuit according to claim 5, characterized in that: The host computer is provided with a maximum protection voltage.

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