Design And Implementation Of The High-power Scanning Magnet Power

The heavy Ion Researched Facility of Lanzhou Cooling Storing Rin (HIRFL-CSR) is a project of the National Science and Engineering in the "Ninth Five-Year Plan" period, construction began in December1999, confirmed by the state in July2008. Cooling Storage Ring relying on heavy ion accelerator, to carry out basic research and key technologies of heavy ion radiotherapy, deep the Heavy Ion clinical cancer experimental terminal has completed clinical trials to obtain a significant effect, making China the world’s first4to achieve ion-clinical cancer country. Beam scanning technology is one of the key technologies of the experimental terminal cancer, it is composed by the X and Y directions dipole deflection magnet power supply, compared with two magnets, when the beam after the dipole magnet gap, scanning excitation current, a magnetic field is generated in the dipole magnet gap, there by guiding the charged ion beam to move in two horizontal (X) and vertical (Y) direction. So that in experimental terminal beam can bombards in the different position of the target according to user needs.Scanning magnet power supply is for the two directions of X and Ydipole deflection magnet excitation current, so that the deflection magnet generating a deflection magnetic field. In a beam scanning apparatus, because there are two directions of X and Y dipole deflection magnet, so there are two of the scanning magnet excitation power. However, because the excitation current provided by the two power supplies is the same, so the principles of the two power supply design targets and structures are the sameThe cancer terminal scanning system, the scanning power requirements is the output power, high precision, small output error. In order to achieve this requirement, the paper adopted the program is a multi-stage H-bridge switching power supply series phase-shift work mode, based on pulse width modulation (PWM) technology to achieve supply current output. Switching power supply output current with MACC sensor sampling as the amount of feedback, and PI regulator of the given value to do comparison get control quantity, the control amount of the input pulse width modulated (PWM) controller, a drive pulse is output by the PWM controller, Power switch is amplified by the drive to drive, thereby forming a closed-loop control system.In order to achieve the triangular wave output of the scanning current, In the power supply system, due to use of multi-H bridge in series shift phase techniques, requires multi-channel PWM signals, system using multiplex wrong phase square wave signal circuit to generate the same frequency, a different phase PWM signal, and generates the corresponding drive signal to each H bridge IGBT power tube. Power supply design process, in order to make the design to meet the power actual work requirements, the theoretical calculations are carried out simulation by the simulation software simploar developed by the ansofl company. In order to make the power operation simple, the process reasonable, and the operation reliable, the power relay control, process, function protection design. After the completion of the verification and design work, production and processing, and various functional modules debugging circuit system needs. The final machine assembly and commissioning, technical indicators test concluded.