5 results about "Peak current" patented technology

The invention relates to a lithium battery dynamic peak power prediction method. The method mainly comprises the following steps: firstly, carrying out SOC-based continuous peak current estimation andequivalent circuit model-based continuous peak current estimation; solving peak current simultaneously meeting the dynamic voltage characteristic, the current limit value, the SOC and the temperatureconstraint of the battery; and obtaining the lithium battery peak power prediction power Pm under the multi-parameter constraint, predicting the lithium battery peak power Pn by using a BP neural network, performing difference comparison on the Pm and the Pn, and performing weighting processing to obtain a final lithium battery peak power prediction result.

A vibration damping apparatus including reference wave production section that produces a reference wave; a fundamental order adaptive algorithm block that calculates fundamental order adaptive filter factors from a vibration detection signal and the reference wave and produces a fundamental order vibration damping current instruction; an amplitude detection section that calculates a peak current value of the fundamental order vibration damping current instruction; and a fundamental order current excess detection section that derives a fundamental order current upper limit value from the fundamental frequency to produce a fundamental order current upper limit excess signal that is output to the fundamental order adaptive algorithm block, which revises the fundamental order adaptive filter factors in a direction in which the vibration damping current instruction is limited within a range.

The invention relates to an electrochemical method for detecting banned additive urotropin in food, which comprises the following steps of: respectively and simultaneously inserting a working electrode carbon paste electrode, a reference electrode saturated calomel electrode and a counter electrode platinum sheet into 0.1mol.L-1PBS (Phosphate Buffer Solution) buffer solution to carry out differential pulse voltammetry scanning to obtain the oxidation peak current value of the urotropin, wherein the pH of the buffer solution is 6, the buffer solution contains a series of urotropin standard solution in different concentrations, and the oxidation peak current value and the concentration of the urotropin have a good linear relationship; with the same method, the oxidation peak current value of the sample solution is obtained; and according to a standard curve and a corresponding linear regression equation, the density of the urotropin in the sample is obtained. The method is simple in operation, is convenient and quick and has a low detection cost, and the urotropin can be directly detected.

The invention provides a switching buck type LED constant-current control circuit, system and method. The switching buck type LED constant-current control circuit comprises an average current comparison module for comparing a current detection sampling signal with an average reference, a peak current comparison module which is used for comparing the current detection sampling signal with a peak reference, a self-adaptive clock generation module which is used for generating a turn-off ending signal; a PWM logic control module which is used for generating a logic control signal; and a driving module. When a current detection sampling signal rises to the average reference and exceeds the average reference, a power switch tube is switched on within the same time, and then the power switch tube is switched off; and if the current detection sampling signal is greater than a peak value benchmark, the power switch tube is turned off in advance, a turn-off reference signal is adjusted at the same time; and when a preset charging signal is greater than the turn-off reference signal, the power switch tube is turned on again, and a next new PWM period is started. According to the switching buck type LED constant-current control circuit, system and method of the invention, small current ripples and high-precision output current can be realized; and the linear adjustment rate and the load adjustment rate are good.