33results about How to "Change amplitude" patented technology

The invention provides a dynamic power flow control device of a controllable transformer. The dynamic power flow control device is composed of the controllable transformer, a power unit, a measurement and control module, a bypass switch, an input voltage transformer, an output voltage transformer and an output current transformer. The dynamic power flow control method comprises the following steps of: controlling the ON and OFF of a subconnector at an input side (original edge) of the controllable transformer by using a quickly powered-on/off electronic power switch; injecting a duple-frequency signal in a pulse-width modulation signal of the electronic power switch of the controllable transformer by using a DC (Direct Current) signal; and changing the phase position and the amplitude of output voltage of the controllable transformer through changing the amplitude of the DC signal in the pulse-width modulation signal as well as the amplitude and the initial phase position of the duple-frequency signal so as to realize the adjustment of active power and reactive power. In the invention, as the conduction of the subconnector of the controllable transformer is controlled, the dynamicpower flow of a power network is adjusted and controlled; and the dynamic power flow control device has the characteristics of low cost and high reliability for the control of dynamic power flow.

The invention aims at providing an impact tension testing apparatus which comprises a supporting pedestal, a concrete pedestal, a transmitting rod, an incident rod, strain gauges, a strain indicator, a dynamic signal memory, a power generator, an annular collision block, a signal triggering device, a time interval instrument, a pulse generating device and an absorbing device; the transmitting rod, the incident rod and the power generator are arranged on the supporting pedestal; a detected test piece is arranged between the transmitting rod and the incident rod which are respectively stuck with the strain gauges; the strain gauges are connected with the strain indicator through lead wires; the incident rod sequentially penetrates through the power generator, the signal triggering device and the time interval instrument and is connected with the power generating device; the pulse generating device is arranged in the absorbing device which is arranged on the concrete pedestal; the signal triggering device is connected with the dynamic signal memory; the strain indicator is connected with the dynamic signal memory; and the annular collision block is arranged in the power generator. The impact tension testing apparatus is simply structured, convenient to mount and remarkably advantaged in cost.

The invention relates to a high power linear output high voltage stabilizing device and a high power linear output high voltage stabilizing method. The device comprises a chord wave generating circuit, a sine wave amplitude amplifier circuit, a prime power amplifier circuit, a push-pull power amplifier circuit, a boosting transformer, a high voltage rectifier filter circuit, a high voltage direct current (DC) output interface, a current sampling circuit and a voltage sampling circuit which are sequentially connected, wherein the current sampling circuit and the voltage sampling circuit are respectively connected with a micro-programmed control unit (MCU) and an over-voltage and over-current protection circuit; the device also comprises a voltage and current display connected with the MCU. The invention provides the high power linear output high voltage stabilizing device and the high power linear output high voltage stabilizing method which are high in stability and accuracy rate and realize high-power output.

The invention discloses a dynamic power flow control device with a wave trap for a controllable transformer. The dynamic power flow control device consists of the controllable transformer, a power unit, a measurement and control module, a bypass switch, the wave trap, an input voltage transformer, an output voltage transformer and an output current transformer. In a dynamic power flow control method, a power electronic switch rapidly switched on and switched off controls the on-off of a tapping point of an output side/secondary side of the controllable transformer; a direct current signal is injected into a frequency-doubled or frequency-multiplied signal in a pulse width modulation signal, and the amplitude of the direct current signal and the amplitude and initial phase of the frequency-doubled or frequency-multiplied signal are changed, thereby changing the phase and amplitude of output voltage of the controllable transformer and realizing the regulation of active power and reactive power; and the wave trap filters triple frequency harmonics or odd harmonics, corresponding to frequency multiplication modulation, of the output voltage of a dynamic power flow controller of the controllable transformer to avoid the distortion of the output voltage. The device and the method have the characteristics of low cost and high dynamic power flow control reliability.

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 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 relates to a high-voltage power supply for medical plastic package liquid leakage detection and a detection method. The detection power supply comprises a sine-wave signal generating circuit, a power amplification circuit, a high-frequency transformer, a high-voltage discharge circuit and a liquid leakage alarm detecting circuit, and is characterized in that an external DC voltage signal is accessed through an input end of the sine-wave signal generating circuit, a plastic package to be detected is placed in a high-voltage discharge gap of the high-voltage discharge circuit, and the liquid leakage alarm detecting circuit externally outputs a liquid leakage alarm signal. Whether the plastic package leaks or not is detected by using a high-voltage discharge method, the high-voltage discharge circuit stays at different degrees of short circuit when the plastic package stays at different degrees of liquid leakage, high-voltage output has characteristics of a voltage source, high-voltage output voltage is relatively constant, and high-voltage output current changes obviously, so that the liquid leakage alarm detecting circuit is facilitated to give out a liquid leakage alarm signal accurately, and thus the reliability of liquid leakage detection can be improved.

The invention discloses a wave generation and combined water-absorbing system for deep-water ice test tank with horizontal cylinder in circular-track oscillation. The system comprises a wave generation mechanism, a first wave-absorbing mechanism, a second wave-absorbing mechanism, a first longitudinal frame, a second longitudinal frame, an infrared sensor, a simulated ice layer and a test tank body; the wave generation mechanism is arranged between the first wave-absorbing mechanism and the second wave-absorbing mechanism and close to the first wave-absorbing mechanism; the wave generation mechanism is used for producing bending gravity wave in one-way propagation; the first wave-absorbing mechanism and the second wave-absorbing mechanism are used for evading the reflection of the bendinggravity wave on a sidewall of the test tank body; the simulated ice layer is arranged at an opened end of the test tank body; the first longitudinal frame is arranged above the wave generation mechanism, and the second longitudinal frame is arranged at the inner wall of one side corresponding to an opening of the test tank body; the infrared sensor is arranged above the simulated ice layer and used for monitoring a bending deformation condition of the simulated ice layer. The system disclosed by the invention can precisely produce the one-way advancing bending gravity wave of the ice tank, andcan effectively adjust a waveform parameter.

The invention discloses an output-side-switching-based dynamic power flow control device for a controllable transformer. The device consists of the controllable transformer, a power unit, a measurement and control module, a bypass switch, an input voltage transformer, an output voltage transformer and an output current transformer. In a dynamic power flow control method, the switching-on and switching-off of an output side/secondary tapping point of the controllable transformer are controlled by utilizing a fast switching-on/off power electronic switch, a frequency doubling signal is injectedinto a pulse width modulation signal of the power electronic switch of the controllable transformer by adopting a direct current signal, and the amplitude of the direct current signal and the amplitude and initial phase of the frequency doubling signal in the pulse width modulation signal are changed, thereby changing the phase and amplitude of output voltage of the controllable transformer and realize active power adjustment and passive power adjustment. The switching-on of the tapping point of the controllable transformer is controlled, thereby realizing adjustment control over the dynamic power flow of a power grid. The device and the method have the characteristics of low cost and high dynamic power flow control reliability.

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 relates to a portable radiation dose meter, dose monitoring equipment and a sectional treatment method and belongs to the technical field of radiation detection instruments. The portableradiation dose meter comprises a CZT detector, a signal processing system, a processor and a shielding case made of metal; and the CZT detector, the signal processing system and the processor are sequentially coupled to one another and are all arranged in the shielding case. Compared with the prior art, by adopting the signal processing system to perform amplification and formation on an electricsignal output by the CZT detector, and the electric signal after screening treatment is output to the processor for pre-processing, so that the amplitude, the pulse width and the like of the output signal can be changed to improve the dose linearity of the portable radiation dose meter and the dose monitoring equipment, and the higher detection efficiency of the portable radiation dose meter whenthe working voltage of the CZT detector is descended to the safety voltage of a human body is ensured.

The invention discloses a dynamic trend control method based on a wide-scope controllable transformer comprising bidirectional power tubes. By use of a rapidly conducted and broken electric electronic switch, conduction and breaking of a tap joint at the output side (secondary side) of the wide-scope controllable transformer are controlled, another two phases of windings are connected in series with the side of each phase of the tap joint of the wide-scope controllable transformer, at the same time, the four bidirectional power tubes are additionally arranged for changing the conduction directions of intersected-phase windings, the phase and the amplitude of output voltages of the controllable transformer can be changed in a maximum scope, adjustment of active power and reactive power is realized, since conduction of the tap joint of the wide-scope controllable transformer is controlled, the dynamic trend of a power network can be adjusted and controlled, and the method has the advantages of low cost and high control reliability of the dynamic trend.

The invention relates to a portable radiation dosimeter and dosage monitoring equipment, and belongs to the technical field of radioactivity detection instruments. The portable radiation dosimeter comprises a CZT (chemoreceptor trigger zone) detector, a signal processing system and a shielding case. The CZT detector is coupled with the signal processing system, the CZT detector and the signal processing system are both arranged in the shielding case, the signal processing system is used for conducting amplification, forming and screening treatment and outputting the electric signal output by the CZT detector, and the shielding case is made from a metal material. The outstanding detection efficiency is ensured by adopting the CZT detector. In addition, the signal processing system is adopted to conduct amplification, forming and screening treatment on the electric signal output by the CZT detector, accordingly the amplitude, pulse width and the like of the output signal can be changed,so that the dosage linearity of the portable radiation dosimeter and the dosage monitoring equipment is improved. The shielding case can protect the CZT detector and the signal processing system frombeing disturbed by outside electromagnetic signals, and thus the accuracy of the radiation dose rate can be improved.

The invention discloses a waveform control system, comprising a Miller integrating circuit, a Schmidt circuit, a Schmidt trigger and a power supply VCC, wherein the output end of the Miller integrating circuit is connected with the Schmidt circuit, the output end of the Schmidt circuit is separately connected with the input end of the Schmidt trigger and the input end of a filter circuit, the output end of the Schmidt trigger is connected with the input end of the Miller integrating circuit, the power supply VCC separately supplies power to the Miller integrating circuit and the Schmidt trigger, and the output end of the filter circuit is connected with the output end Vo of the system. According to the waveform control system disclosed by the invention, a direct current power supply VCC is directly converted to a square wave signal, the amplitude value and frequency of the square wave signal at the output end can be changed by changing the size of the power supply VCC and the charge and discharge frequency of a capacitor C1, the secondary amplification is not required, high stability can be achieved, and the obtained waveform is low in distortion rate.

The invention discloses a wide-range controllable transformer-based dynamic power flow control device provided with bidirectional thyristors. The wide-range controllable transformer-based dynamic power flow control device provided with the bidirectional thyristors is composed of a controllable transformer, a power unit, a measurement and control module, a cross-phase conversion module, a filtering capacitor, an input and output voltage transformer and an output current transformer. According to the dynamic power flow control method, a power electronic switch enabling rapid turning on and turning off is utilized to control the turning on and turning off of the taps of the input side (primary side) of the wide-range controllable transformer; another two phases of windings are connected in series into each phase of tap of the wide-range controllable transformer; four bidirectional thyristors are additionally adopted, so that the turn-on direction of cross-phase windings can be changed, and therefore, the phase and amplitude of the output voltage of the controllable transformer can be changed in a largest range, and the adjustment of active power and reactive power can be realized; and since the turning on of the taps of the wide-range controllable transformer is controlled, so that adjustment and control on the dynamic power flow of a power grid can be realized. The control device has the advantages of low cost and high reliability of dynamic power flow control.

The invention relates to an LVDT/RVDT simulation module output circuit, which comprises an excitation voltage acquisition circuit and an LVDT/RVDT simulation circuit, an external excitation signal of the excitation voltage acquisition circuit is used as a reference source of a DA conversion chip, a digital end of the DA conversion chip outputs a fixed voltage value, and the reference source is an alternating current excitation signal, so that the voltage value of the LVDT/RVDT simulation module output circuit is improved. Therefore, a DA actual output signal and an input excitation voltage signal have the same frequency and the same direction, the amplitude of an LVDT/RVDT simulation signal can be changed by changing a DA output voltage value, and simulation of the position of the sensor is achieved. The circuit is easy to implement, high in control precision and capable of flexibly controlling continuous scanning output of displacement values.