33results about How to "Change amplitude" patented technology

The invention discloses a device for simulating sea wave swings. The device is used for testing stability of a sea surface stabilized platform to be tested, and comprises a variable speed motor, a transmission device, a sinusoidal motion mechanism, a pedestal and a transmission belt, wherein the variable speed motor, the transmission device and the sinusoidal motion mechanism are arranged on the pedestal, the variable speed motor is connected with the transmission device through the transmission belt for providing power input, one end of the sinusoidal motion mechanism is connected with the transmission device, and the other end is fixed to the bottom part of the sea surface stabilized platform to be tested. The device provided by the invention can simulate swing motion of sea waves, can change amplitude of the swing motion by adjusting length of a crank, can adjust frequency of motion by changing rotation speed of the motor, is simple in operation, occupies small space, and is suitable for indoor stability tests of the sea surface stabilized platform.

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 specifically relates to a square wave and sawtooth wave generation circuit based on a memristor. The invention has the technical scheme that the square wave and sawtooth wave generation circuit consists of an in-phase input hysteresis comparator (1), an integral circuit (7) with an adjustable charging and discharging time constant, a first variable gain amplification module (14), a second variable gain amplification module (13) and a control module (12), wherein the control module (12) is respectively connected with the in-phase input hysteresis comparator (1), the integral circuit (7) with the adjustable charging and discharging time constant, the first variable gain amplification module (14) and the second variable gain amplification module (13). The square wave and sawtooth wave generation circuit based on the memristor has the advantages of simple structure, high precision, good stability and easiness in realizing automatic control.

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.

The invention discloses a dynamic power flow control device based on a wide-range controllable transformer including bidirectional thyristors. The dynamic power flow control device is formed by a controllable transformer, a power unit, a measuring and controlling module, a cross phase conversion module, a filter capacitor, an input / output voltage transformer and an output current transformer. The dynamic power flow control method is carried out in a way that an electronic power switch which can be turned on / off quickly is employed to control the turn-on / off of a tap joint at the output side (secondary side) of the wide-range controllable transformer, other two phases of windings are connected in series with each phase tap joint of the wide-range controllable transformer, at the same time, four bidirectional thyristors are added to change the conducting direction of the cross phase winding, and therefore the phase and amplitude of the output voltage of the controllable transformer can be changed in a maximum range, and active power and reactive power can be adjusted; because the conduction of the tap joints of the wide-range controllable transformer is controlled, the dynamic power flow of a power network can be adjusted and controlled. The dynamic power flow control method for the wide-range controllable transformer including the bidirectional thyristors is characterized by being low in cost and high in dynamic power flow control reliability.

The invention relates to a high-power linear output high-voltage device and method. Including sequentially connected sine wave generating circuit, sine wave amplitude amplifying circuit, primary power amplifying circuit, push-pull power amplifying circuit, step-up transformer, high-voltage rectifying and filtering circuit, high-voltage DC output interface, and MCU and overvoltage and overcurrent protection respectively A current acquisition circuit and a voltage acquisition circuit connected with the circuit; also includes a voltage and current display interconnected with the MCU. The invention provides a high-stability, high-accuracy, high-power output high-power linear output high-voltage device and method.