A multi-channel adjustable electric field strength driver

Abstract

The application belongs to the technical field of mass spectrometer equipment development, and particularly relates to a multi-path adjustable electric field strength driver. The driver comprises a single-chip microcomputer, a direct current voltage module, a communication interface module, an LED module, a DAC digital-analog conversion module, an operational amplifier module and a high-voltage module. The single-chip microcomputer is connected with the communication interface module, the LED module and the DAC digital-analog conversion module respectively, the direct current voltage module supplies power for the MCU module, the DAC digital-analog conversion module is multiple, each DAC digital-analog conversion module is connected with two operational amplifier modules, the operational amplifier module is connected with the high-voltage module, and the high-voltage module outputs signals. The driver provides a complex electric field environment for the lens component in the mass spectrometer equipment, and is used for extracting, focusing, decelerating, accelerating and adjusting the charged particles, and deflecting and fine-tuning the running track of the charged particle beam.

Description

Technical Field

[0001] This invention belongs to the field of mass spectrometer equipment development technology, specifically relating to a multi-channel adjustable electric field strength driver. Background Technology

[0002] The primary function of a multi-channel adjustable electric field strength actuator in a mass spectrometer is to extract charged particles from a particle beam, perform preliminary screening of the beam, and guide particles meeting the extraction criteria into a quadrupole under the influence of a specific electric field. This allows the mass spectrometer to further accurately screen and analyze the particle beam containing the analyte. This type of device only emphasizes the effect of the electric field strength on the charged particles, controlling the deflection of the particle beam; it does not require any physical work. There are no mature products of this type on the current market, and it needs to be developed independently based on specific requirements. Summary of the Invention

[0003] The purpose of this invention is to provide a multi-channel adjustable electric field strength driver, which provides 10 individually adjustable voltage intensity output terminals, of which 8 channels have a voltage adjustment range of [missing information]. The voltage regulation range of the two channels is Each voltage adjustment has an accuracy of ±0.5V and a resolution of 1V, which is applied to the lens components in the mass spectrometer.

[0004] The technical solution of this invention is as follows: A multi-channel adjustable electric field strength driver includes a microcontroller, a DC voltage module, a communication interface module, an LED module, a DAC digital-to-analog converter module, an operational amplifier module, and a high-voltage module. The microcontroller is connected to the communication interface module, the LED module, and the DAC digital-to-analog converter module. The DC voltage module supplies power to the microcontroller module. Multiple DAC digital-to-analog converter modules are included, each connected to two operational amplifier modules. The operational amplifier modules are connected to the high-voltage module, which outputs signals.

[0005] The microcontroller described is implemented using an MCU chip.

[0006] The DC voltage module converts 220V to 12V via a transformer power supply as the basic operating power supply. This includes filtering / protection to convert the voltage to 12V for output. The DC voltage module performs DC / DC conversion to output DC5V. The filtering is achieved through a Zener diode to obtain the required 12V reference voltage.

[0007] The communication interface module uses an RS232 data transmission chip to establish a communication protocol between the microcontroller and the computer, thereby enabling communication between the microcontroller and the computer.

[0008] The LED module is controlled by a microcontroller for each voltage output. When the voltage of a given output is 0V, the corresponding LED is off, and when there is voltage in that output, the corresponding LED is on.

[0009] The DAC digital-to-analog converter module uses a dedicated DAC chip. The microcontroller and the DAC chip are connected according to the function pins. The voltage value written by the user through the RS232 serial port is encoded into a digital code by the microcontroller and sent to the DAC chip. The microcontroller uses a lookup table method. After the user writes the voltage value, the microcontroller uses the voltage value to obtain the encoded value from the pre-established encoded value list in the microcontroller. This encoded value drives the DAC chip to output an analog voltage value between 0V and 1V. This voltage output value is the initial analog voltage adjustment voltage of the high-voltage module.

[0010] The operational amplifier module amplifies the analog voltage (0V~1V) obtained from the DAC to a value that meets the effective adjustment range of the high voltage module, namely (0V~5V).

[0011] The high-voltage module mentioned above is available in three types in this device: (0V~200V), (0V~-200V), and (0V~400V).

[0012] The beneficial effects of this invention are as follows: When applied to the lens component of a mass spectrometer, it is used for the extraction, focusing, deceleration, and acceleration adjustment of charged particles, as well as fine-tuning the deflection of the charged particle beam trajectory. This driver provides a complex electric field environment for the lens component. Because this driver simultaneously provides 10 independently adjustable electric fields, the adjustable electric field range is... and Two types are available, each measuring 20cm × 15cm × 4cm. The overall driver is a standalone device and can be used in other environments where charged particle beams are controlled. Attached Figure Description

[0013] Figure 1 A schematic diagram of a multi-channel adjustable electric field strength driver provided by the present invention;

[0014] Figure 2 This is a schematic diagram of a DC voltage module;

[0015] Figure 3 This is a schematic diagram of the communication interface module;

[0016] Figure 4 This is a schematic diagram of a DAC (Digital-to-Analog Converter) module. Detailed Implementation

[0017] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0018] like Figure 1As shown, a multi-channel adjustable electric field strength driver includes a microcontroller, a DC voltage module, a communication interface module, an LED module, a DAC (Digital-to-Analog Converter) module, an operational amplifier module, and a high-voltage module. The microcontroller is implemented using an MCU chip and is connected to the communication interface module, the LED module, and the DAC module. The DC voltage module powers the MCU module. Multiple DAC modules are included, each connected to two operational amplifier modules. The operational amplifier modules are connected to the high-voltage module, which outputs the signal.

[0019] like Figure 2 As shown, the DC voltage module converts 220V to 12V via a transformer power supply as the basic operating power source. This includes filtering / protection to convert the voltage to 12V for output. The DC voltage module performs DC / DC conversion to output DC 5V. The filtering is achieved through a Zener diode to obtain the required 12V reference voltage. Based on the reference 12V voltage, a dedicated 12V to 5V chip is used, along with voltage divider resistors and voltage stabilizing capacitors around the chip, to obtain the required 5V DC output and reference 5V voltage. The 12V DC voltage primarily provides a stable operating voltage for the high-voltage module, while the 5V DC voltage provides operating voltage for the microcontroller, operational amplifier, LED module, and RS232 chip. The 5V reference voltage provides a 5V reference voltage for the high-voltage module's voltage regulation terminal (0V~5V).

[0020] The communication interface module uses an RS232 data transmission chip to establish a communication protocol between the microcontroller and the computer, enabling communication between the microcontroller and the computer. The chip selected for implementing the RS232 communication protocol encoding is the MAX202E, where the MAX202E's signal reception and transmission are linked to the MCU chip's RS232T and RS232R, respectively. The RS232 communication protocol encoding chip communicates with the MCU through RS232T and RS232R, obtains binary code, encapsulates it into an encoding format, sends it out via TXD2, and receives data sent back via RXD2, parsing the binary code according to the RS232 encoding format to achieve RS232 communication. During RS232 communication, signals sent or output by the MAX202E encoding chip cannot be directly used as transmission signals; they need to be processed by the SN65LBC184 chip before transmission.

[0021] The LED module is controlled by a microcontroller for each voltage output. When the voltage of a given output is 0V, the corresponding LED is off; when there is voltage, the corresponding LED is on. The microcontroller assigns 20 pins (Q1 to Q20) to the 20 LED pins. When the corresponding voltage circuit is not 0V, a dedicated pin between Q1 and Q20 outputs a low level (0), indicating that the LED is on. Otherwise, the pin is high (1), indicating that the LED is off. The LED illumination is used to provide feedback on the output of each electric field, using the on / off state of 16 LEDs. The output status of the 8 channels is indicated by the on / off state of two LEDs. The two-channel output uses two LEDs to indicate the driver's communication status. Each of the 20 LEDs is connected to the MCU via three sets of encoding chips. During the MCU's process, the voltage output (DA) is executed, and commands are sent through corresponding pins to illuminate the corresponding LEDs.

[0022] The DAC digital-to-analog converter module uses a dedicated DAC chip. The microcontroller and the DAC chip are connected according to the function pins. The voltage value written by the user through the RS232 serial port is encoded into a digital code by the microcontroller and sent to the DAC chip. The microcontroller uses a lookup table method. After the user writes the voltage value, the microcontroller uses the voltage value to obtain the encoded value from the pre-established encoded value list in the microcontroller. This encoded value drives the DAC chip to output an analog voltage value between 0V and 1V. This voltage output value is the initial analog voltage adjustment voltage of the high-voltage module.

[0023] The operational amplifier module amplifies the analog voltage (0V~1V) from the DAC to a range that matches the effective adjustment range of the high-voltage module, i.e., (0V~5V). The DAC module outputs an analog voltage of (0V~1V), while the high-voltage module adjusts its voltage range of (0V~5V). The DAC module controls the high-voltage module to change proportionally, hence the need for an operational amplifier module.

[0024] The high-voltage modules in this device come in three types: (0V~200V), (0V~-200V), and (0V~400V). The operating voltage is 12V, supplied by a power supply module. The voltage output control pins are Vadj and ground. When a voltage value between (0V~5V) is applied to the control pin Vadj, the high-voltage module will proportionally output a corresponding value between (0V~200V), (0V~-200V), and (0V~400V). The Vadj voltage value is the amplified voltage output value provided by the operational amplifier.

Claims

1. A multi-channel adjustable electric field strength driver, characterized in that: The system includes a microcontroller, a DC voltage module, a communication interface module, an LED module, a DAC (Digital-to-Analog Converter) module, an operational amplifier module, and a high-voltage module. The microcontroller is connected to the communication interface module, LED module, and DAC module. The DC voltage module powers the microcontroller. Multiple DAC modules are used, each connected to two operational amplifier modules. These operational amplifier modules are connected to the high-voltage module, which outputs the signal. Each DAC module uses a dedicated DAC chip. The microcontroller and DAC chip are connected according to their functional pins. The voltage value written by the user via the RS232 serial port is displayed in the compiled data structure of the microcontroller. The character encoding is sent to the DAC chip. The microcontroller operates using a lookup table method. After the user writes the voltage value, the microcontroller uses this voltage value to retrieve the encoded value from a pre-established encoding value list within the microcontroller. This encoded value drives the DAC chip to output an analog voltage value between 0V and 1V. This voltage output value is the initial analog adjustment voltage for the high-voltage module. The operational amplifier module amplifies the analog voltage (0V to 1V) obtained from the DAC to a value that meets the effective adjustment range of the high-voltage module, i.e., (0V to 5V). There are three types of high-voltage modules in this device: (0V to 200V), (0V to -200V), and (0V to 400V).

2. The multi-channel adjustable electric field strength driver as described in claim 1, characterized in that: The microcontroller described is implemented using an MCU chip.

3. The multi-channel adjustable electric field strength driver as described in claim 1, characterized in that: The DC voltage module converts 220V to 12V via a transformer power supply as the basic operating power supply. This includes filtering / protection to convert the voltage to 12V for output. The DC voltage module performs DC / DC conversion to output DC5V. The filtering is achieved through a Zener diode to obtain the required 12V reference voltage.

4. A multi-channel adjustable electric field strength driver as described in claim 1, characterized in that: The communication interface module uses an RS232 data transmission chip to establish a communication protocol between the microcontroller and the computer, thereby enabling communication between the microcontroller and the computer.

5. A multi-channel adjustable electric field strength driver as described in claim 1, characterized in that: The LED module is controlled by a microcontroller to output each voltage channel. When the voltage of a channel is 0V, the corresponding LED is off, and when there is voltage in the channel, the corresponding LED is on.

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