33results about How to "Change amplitude" patented technology

The invention discloses a dynamic tide flow control device based on a wide-range controllable transformer comprising bidirectional power tubes, and the device consists of a controllable transformer, a power unit, a measurement and control module, a cross phase conversion module, a filter capacitor, an input / output voltage transformer, and an output current transformer. The control method of a dynamic tide flow comprises the steps: controlling the on / off of a tapping point at an input side (a primary side) of the wide-range controllable transformer through employing a power electronic switch which can achieve quick switching-on and switching-off; connecting another two windings at a tapping point of each phase of the wide-range controllable transformer in a series manner; adding four groups of bidirectional power tubes too change the switching-on direction of the cross phase conversion module, thereby changing the phase and amplitude of the output voltage of the controllable transformer in the largest range, and achieving the adjustment of active power and reactive power. The method carries out the control of the switching-on of the tapping point of the wide-range controllable transformer, thereby achieving the regulation and control of the dynamic tide flow of a power grid. The device is low in cost, and is high in control reliability of the dynamic tide flow.

The invention relates to a beam instability prevention-based asymmetric pulse voltage modulation electronic beam method. The method comprises the following steps of (1) modulating DC bias of a controlpole to a pulse voltage by a high-voltage pulse signal, wherein other basic parameters of the system are correspondingly changed according to modulation requirement; (2) triggering a logic driving circuit of a high-voltage switch by a trigger signal, and determining a frequency of a high-voltage pulse signal and pulse width of the high-voltage switch according to the frequency and the pulse widthof the trigger signal; (3) calculating the frequency of the high-voltage pulse signal according to a cyclotron frequency of an ion beam; (4) setting a modulation period T in an injection period; (5)setting the frequency fe and the pulse width Um of the trigger signal; (6) setting amplitude +U and -U of the DC bias; (7) setting an initial time Ts and an ending time Te of a synchronous time sequence control instruction of each modulation period; (8) setting a modulation mode; and (9) triggering a modulation system. The method has the advantage of flexible adjustment and combination and is easyto implement.