In the transmitter, the controller is used to realize the transmitter real-time monitoring and control.In order to guarantee the quality of the transmitter controller, for manual testing, high repetition rate, low efficiency and low accuracy problem, a set of automatic test system based on LabVIEW and TestStand has been designed and developed.Mainly introduced the the design process of the automatic test and test results for transmitter controller function, the system can test the function of the controller quickly and accurately according to the established sequence, it can effectively improve the test efficiency of the staff.
In order to improve the modularization degree of cascaded H-bridge converter and reduce the development cost, a modularized carrier phase shifted sine pulse width modulation (CPS-SPWM) based on multi-controller is proposed in this paper, which can easily increase or decrease the number of submodules in cascaded H-bridge. In order to solve the problem of coordination in multi-controller structure, a two-stage control structure is proposed, which uses the master controller to carry out closed-loop control for multiple slave controllers, and uses the approximate natural sampling method to realize digital CPS-SPWM modulation, which reduces computation and makes full use of controller resources. The experimental result shows that the stepped voltage waveform output by the proposed method at the AC side is of high quality and H bridge submodule is easy to be increased and decreased.
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