8 results about "Negative peak" patented technology

A method comprising: generating, by a peak detector, a comparison signal by comparing a coil current of a relay against a dynamic threshold, the comparison signal having a first value when the coil current is above the dynamic threshold, the comparison signal having a second value when the coil current is below the dynamic threshold, wherein the peak detector is configured to: cause the dynamic threshold to track the coil current until a positive peak in the coil current is reached that has a value PP, and set the dynamic threshold to a rebound value R in response to detecting that a negative peak in the coil current is reached, the rebound value R being based on the value PP; detecting whether the relay is in a faulty state based on the comparison signal; and generating an indication of a fault when the relay is in a faulty state.

The application discloses a centering method of a spiral scanning measurement system, comprising a rotating platform, an x-direction driving platform and a y-direction driving platform for driving the rotating platform, and a probe, wherein the centering is performed according to the following steps: S01, placing a scale sheet in the center of the rotating platform; S02, moving the probe to the center of the rotating platform, so that the scale sheet is in the measurement range of the probe, and the z-axis height value h of the scale sheet is set as 0; S03, starting the rotating platform, and recording the total number N of positive and negative peak values of the signal sent by the probe when the rotating platform rotates one round; and S04, under the condition that the rotating platform continues to rotate, adjusting the x-direction driving platform and the y-direction driving platform to make N tend to 0, and completing the centering of the driving rotating platform. The scale sheet is taken as a measured object, the eccentricity error r is reflected through the scale sheet, and the centering is realized by gradually eliminating the zero-crossing number N.

The application provides a processing circuit of a float flowmeter converter, a collection and amplification module collects and amplifies a signal voltage to obtain an amplified voltage; a bias collection module receives the amplified voltage, collects the amplified voltage to obtain a positive peak value of the amplified voltage and a negative peak value of the amplified voltage, performs proportional subtraction operation on the positive peak value and the negative peak value to obtain a bias value of the amplified voltage; an amplitude collection module receives the amplified voltage and the bias value, performs subtraction operation on the amplified voltage and the bias value to obtain a corrected amplified voltage, the corrected amplified voltage is the amplified voltage without bias, collects the corrected amplified voltage to obtain an amplitude of the corrected amplified voltage. The application processes the signal voltage related to the magnetic displacement of the float flowmeter, collects the bias value and the amplitude of the signal voltage, eliminates the bias value of the signal voltage, and obtains the accurate signal voltage amplitude and bias value, thereby improving the accuracy and precision of subsequent flow calculation.

Provided is an electromagnetic wave absorber which is capable of satisfactorily absorbing electromagnetic waves having a high frequency of at least a millimeter band, and which is also capable of satisfactorily absorbing electromagnetic waves having a desired frequency even when the ambient temperature changes. An electromagnetic wave absorber in which a magnetoplumbite-type hexagonal ferrite (1a) that performs magnetic resonance in a millimeter-band frequency band is contained in a binder (1b), said electromagnetic wave absorber being characterized in that: a part of metal sites of the magnetoplumbite-type hexagonal ferrite are substituted by La; in a graph representing the relationship between the frequency of the incident electromagnetic wave and the value of the imaginary part of the complex number relative permeability of the electromagnetic wave absorber, when the temperature of the electromagnetic wave absorber changes from 25 DEG C to 105 DEG C, the value of the frequency that becomes a positive peak shows a positive rate of change, and the value of the frequency that becomes a negative peak shows a positive rate of change. The ratio of the amount of change in the frequency of a positive peak when changed from 25 DEG C to 105 DEG C to the value of the frequency of a positive peak at 25 DEG C is 1.5% or less.

The invention discloses a freeze-drying stage conversion judgment method and system based on weightlessness acceleration peak detection, and belongs to the technical field of freeze-drying process control. According to the method, the average weight loss rate of freeze-dried materials is calculated by monitoring weight loss data of the freeze-dried materials in real time, and the weight loss acceleration is further solved; and by tracking the signal of the weightlessness acceleration in real time, identifying the unique and obvious negative peak value appearing in the whole freeze-drying process, and judging the peak value point as an inflection point of conversion from the sublimation drying stage to the desorption drying stage. According to the method, a fixed judgment threshold value related to the materials does not need to be preset, full-automatic, self-adaptive and high-precision stage conversion judgment is achieved, the universality and the intelligent level of the method are remarkably improved, and meanwhile the system cost and the debugging complexity are reduced.

The application discloses a third harmonic injection method and device suitable for converter circulating current control, and the method comprises the following steps: obtaining the amplitude and phase of a converter power frequency modulation wave and the amplitude and phase angle of a second harmonic modulation voltage introduced by the converter circulating current control; determining the amplitude and phase of the third harmonic injection voltage when the maximum and minimum of the positive and negative peak values of the converter alternating current modulation wave are determined according to the relationship between the amplitude and phase angle of the second harmonic modulation voltage introduced by the converter circulating current control and the amplitude and phase of the converter power frequency modulation wave. The application can improve the consistency of the positive and negative peak values of the converter modulation wave, thereby further improving the rated voltage of the valve side of the converter transformer, reducing the converter valve and related current, and reducing the system loss.

The invention discloses a control method and a control circuit of a switching power supply and the switching power supply, the switching power supply comprises a first switching tube and a second switching tube, the first switching tube is used as a main switching tube of the switching power supply, the second switching tube and the first switching tube are alternately conducted, and the second switching tube is used as a main switching tube of the switching power supply. Controlling the turn-off of the first switching tube according to the first jitter signal so as to enable an inductive current peak value to jitter along with time; the second switching tube is controlled to be turned off according to a second jitter signal, so that an inductive current negative peak value jitters along with time at least in a part of time period, when the inductive current negative peak value jitters along with time, the jitter direction of the inductive current negative peak value is opposite to the jitter direction of the inductive current peak value, and the jitter direction of the inductive current negative peak value is opposite to the jitter direction of the inductive current peak value. Therefore, the output power fluctuation is reduced. The EMI characteristics can be optimized, and output voltage ripples can be reduced.