Design of Virtual Device Driver (VxD) The VxD program mainly communicates with the PC and the data acquisition circuit, manages the No. 10 interrupt of the ISA slot of the PC, reads the AD conversion data in an interrupt mode, and sends it back to the PC, by the Windows program Perform data processing. There are many development tools for VxD. In this paper, the VtoolSD software color is used. QuickVxD is used to quickly generate the VxD frame, and then the code is added to the corresponding interface function of the frame program. The following are several interface functions of VxD for virtual device development: set a number of variables datal-data4 in this interface function to store the AD conversion data of channels 1-4; this function transfers VxD from the data buffer channel of the data acquisition circuit The AD conversion data obtained in is sent back to the Windows application program; the communication interface between VxD and hardware: it is the communication interface between VxD and the data acquisition circuit, that is to say, this function is executed as soon as the 10th interrupt occurs. In this function, the operation of unlinking VxD and IRQ10 is performed. 33 Windows application design Windows application mainly implements the sterilization soft operation control panel, including hardware initialization, sterilization process start and stop, pulse electric field parameter setting and adjustment, dynamic display of sterilization voltage, etc. In the INTO interrupt service program, you only need to cut off the pulse power, that is, to clear the P2.7 bit, and force the high-speed electronic switch to interrupt the sterilization process.
The design software control panel of the control system of the high-voltage pulse electric field food sterilization device is mainly divided into three parts: parameter display and adjustment, sterilization voltage display and monitoring, sterilization process start and stop, in addition, there are two virtual equipment controls indicating that the current sterilization status is normal Still not normal.
Phase Control Thyristor is the abbreviation of thyristor, also known as Silicon Controlled Rectifier, formerly referred to as thyristor; thyristor is PNPN four-layer semiconductor structure, it has three poles: anode, cathode and control pole; thyristor has silicon rectifier The characteristics of the parts can work under high voltage and high current conditions, and their working processes can be controlled and widely used in electronic circuits such as controlled rectifiers, AC voltage regulators, contactless electronic switches, inverters, and inverters.
Phase Control Thyristor
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