86results about How to "Few modules" patented technology

The invention discloses a circuit for accurately correcting the duty ratio of a clock signal. The circuit comprises an inverter chain, a delay unit, a phase detection unit and a low-pass filter. The inverter chain adopts one CMOS inverter or adopts a plurality of cascaded CMOS inverters. An input signal enters the input end of the inverter chain. The duty ratio of the input signal is adjusted through the change of the grid bias voltage of the first CMOS inverter in the inverter chain, and the inverter chain outputs an output signal subjected to duty ratio correction. And the output signal passes through the time delay unit to obtain a time delay signal. The output signal and the delay signal are used as input of the phase detection unit together, and the phase detection unit outputs an indication signal representing whether the duty ratio of the output signal reaches a target value or not. After high-frequency components of the indication signals are filtered out through a low-pass filter, the remaining low-frequency and direct-current components serve as grid direct-current bias voltage of a first CMOS inverter in the inverter chain. The duty ratio of the output signal can be accurately controlled.

The invention discloses a continuous vibration signal time history replication control method which is realized by software arranged in a control system. The continuous vibration signal time history replication control method comprises the following steps of target signal processing; system self-checking; initial transfer function estimation; and time domain vibration control which includes the steps that current driving frame data are transmitted in real time; a system transfer function is identified by the previous frame of data, and interpolation and updating are performed on the transfer function; and next frame of driving signals are calculated. A better vibration control method aiming at a continuous vibration mode is provided on the basis of frequency domain digital iteration control. The time domain control method is adopted so that control is stable, vibration time history replication control precision is great, the method is suitable for continuous random, sine and other vibration tests, and transport, flight vibration, airborne and ship-based time history vibration environments can be more truly simulated.

The invention relates to a general waveform reproduction control method and device. The general waveform reproduction control method includes setting test parameters, performing target wave processing, estimating original transfer functions and adjusting order. The control device comprises a computer and a signal interface case. The computer is connected with the signal interface case through Ethernet electric signals and provided with a general seismic modeling control system. The signal interface case is used for connecting controller inner signals and inputting and outputting external hardware signals. The signal interface case integrates an acceleration signal conditioning board, a displacement signal conditioning board, a busbar clamping slot, a single board computer and a power supply module. The general seismic modeling control system comprises a test parameter setting unit, a target wave processing unit, a seismic waveform simulation unit and a signal analyzing unit. By the use of the control method, estimation accuracy of the system transfer functions within full spectrum band is high, and test steps are simplified. The control device is simple and reasonable in structural design and high in control accuracy and has fewer modules and complete signal analyzing and processing functions.