1095 results about "Electronic load" patented technology

Embodiments of the present invention relate to a low voltage differential signal driver (LVDS) circuit which comprises a current source, logic controlled switches for controlling the driver's output, an electronic load circuit coupled across the circuit, and a common-mode resistor feedback circuit coupled across the circuit, in parallel with the RC load, for tuning the driver's impedance. The driver is enabled to operate without op-amps and achieves optimum performance at 1.8 v supply voltages.

This invention provides an electronic control method for a planar inductive battery charging apparatus on which one or more electronic loads such as mobile phones, MP3 players etc can be placed and charged simultaneously. The power control circuit of the charging pad consists of two power conversion stages. Depending on the nature of the input power supply, the first power stage is an AC-DC power converter with variable output voltage control and a second stage is a DC-AC power inverter with constant current control. The combination of the two stages provides power control of the charging pad and generates AC magnetic flux of ideally constant magnitude over the charging areas within a group of primary windings that are excited.

A house uses solar light generated electric power and external commercial electric power and consumes the electric power with a household electronics load or the like. The house includes an electricity storage device and an electric power management device. The electric power management device further has a function to calculate transition of the load electric power, transition of the solar battery generated electric power, and transition of a leveled external commercial electric power during one day, classify the electric power by the power generation methods, apply a green index serving as a standardized index which is defined in advance to each power generation method to calculate an electric power green index, and display a result thereof on a display unit.

The invention discloses a SOC-SOH joint on-line real-time estimation and on-line modification method, the method comprises an SOC hardware pre-estimation module and a lithium battery equivalent-circuit parameter correction module, wherein the SOC hardware pre-estimation module utilizes a Hall current sensor to convert a heavy current signal into a low voltage signal, noise filtering is performed on the signal through a band-pass filter, the filtered signal is transmitted to an RC integrator to indirectly realize the integral for the current signal, and an integral signal acquired by an ADC is transmitted to an MCU chip to correct; the lithium battery equivalent-circuit parameter correction module comprises a square-wave pulse switch current source and a controllable electronic load, the square-wave pulse switch current source or the controllable electronic load is utilized to perform charge or discharge test on the lithium battery, the ADC is utilized to acquire terminal voltage of a battery pack, and according to the input response of charge or discharge curve, parameters of a battery equivalent model in a charge-discharge process are corrected. According to the invention, the method overcomes a circuit model parameter correction problem and realizes SOC-SOH real-time accurate on-line joint estimation.

A luggage weight measuring device for integration into a luggage case, or between the luggage case and handle or for mounting to the luggage case handle. In one embodiment at least one electronic load measuring sensor is mounted directly between the handle and the luggage case, for example to a deformable member which deforms as the handle is lifted to take up the load carried by the luggage case. Deformation is mathematically related to the load. A processor determines the load corresponding to the deformation as detected by the sensors and displays the load on a user viewable display on the luggage case or handle.

Solar power tracking techniques are described herein. In one aspect of the invention, a solar power tracking apparatus includes, but is not limited to, a voltage converter and a controller coupled to the voltage converter. The voltage converter includes an input capable of being coupled to a solar power source and an output capable of being coupled to an electronic load, such as, for example, a portable electronic device. The voltage converter is configured to monitor or detect an amount of power drawn by the electronic load at the output of the voltage converter. In response to the monitored power drawn, the controller is configured to control the voltage converter to reduce amount of power to be drawn subsequently if the monitored amount of power exceeds a predetermined threshold. As a result, the output voltage from the solar power source is maintained within a predetermined range. Other methods and apparatuses are also described.

The invention provides a device for testing solar cell parameter which belongs to the testing device for voltage and current. The device can solve problems of larger volume and high equipment cost in present, and is convenient for testing mass production solar cell in producting line. The device includes a simulation light source, a parameter tester and a testing table, the simulation light source locates on upper part of the testing table, a radiator device locates on down part of the testing table; the parameter tester includes a DSP, an AD conversion module, a DA conversion module, an electronic load module, a display module, a temperature testing module and a light radiation degree testing module. The device uses the DSP as a control center, the equipment is simple and has low cost which can monitor change of temperature and light radiation light in real time, and can test various parameter of the solar cell accurately, rapidly and stably: short circuit current, open circuit voltage, maximum output power, optimizing working current, optimizing working voltage, filling factor, conversion efficiency and I-V curve.

Described herein is, for example, a battery or capacitor over voltage (overcharge) and under-voltage protection circuit, that, for example, is adapted to not draw current from the battery or capacitor to be charged unless charge energy is detected and to not charge an energy storage device when an over-charge condition is sensed. The protection circuit may, for example, not be turned on unless an over voltage condition is present. Incoming energy to the system can be shunted to ground via a shunt load of various types including resistive loads and active components such as a zener diode. In some embodiments, no switching of the inbound power is required. Within limits, no regulation of inbound power is needed. When inbound power is sufficient to charge the battery or capacitor, regulation can occur via the applied shunt regulator if overcharge voltage conditions exist. Either type of charge source, voltage or current, can be used to provide charge energy. Combining said battery or capacitor over voltage (overcharge) and under-voltage protection circuit with electronic loads, such as wireless sensors, may lead to autonomously-powered wireless sensor systems.

A flexible closed-loop controller capable of being quickly and easily configured for a broad range of applications. The controller contains a set of control elements that may be configured or reconfigured for any specific application. Built-in configuration management automates configuration of the control elements dependent on user commands or operating conditions. The controller is autonomous after initial configuration, although it may be used interactively. This flexible closed-loop controller is suitable for switching power supplies, linear amplifiers, AC inverters, battery chargers, electronic loads, temperature and pressure management, motor or actuator drives, as well as industrial automation, data acquisition, and automatic test equipment. The controller reduces development time and cost, reduces parts count and cost, and improves performance and reliability of real-time closed-loop systems.

A feedback electronic load of high frequency isolated single-phase electric energy in multi-input channel modularization mode is prepared for forming each DC voltage conversion module by connecting high frequency conversion circuit and high frequency transformer as well as high frequency rectification circuit in sequence, forming inverter unit by connecting inverter and AC filter with each other, then connecting DC output end of DC voltage conversion module to DC input end of inverter unit.

The invention provides an electronic load module of a power supply aging test and a power supply aging test system. The electronic load module of the power supply aging test provides an intelligent electronic load module controlled by an MCU (Microprogrammed Control Unit). According to the power supply aging test system, a plurality of electronic load modules of the power supply aging test are uniformly managed, displayed and stored by adopting an upper computer, so that the system is the intelligent power supply aging test system.

The invention discloses a virtual battery management system and an application method thereof, belonging to the technical field of new energies. The virtual battery management system has the structure as follows: a central data processing unit is respectively connected with a man-machine interaction unit, a power battery emulation unit, a CAN (Controller Area Network) communication unit, a measuring unit and an electron load control unit. The virtual battery management system has the advantages that: firstly, the state and charging requirements of a charging object which is possibly encountered in the actual use process are integrated in one system; secondly, charging state information interaction between the virtual battery management system and charging equipment to be tested is realized; thirdly, the model parameters and time coefficients of the test type power battery can be adjusted, and the controllability and work frequency of the charging equipment are improved; and fourthly, the invention provides reference for the influence of the charging equipment on the power battery in the charging process of the power battery, and diversity of the charging loads and universality of the test environment of the charging equipment are realized.

The energy feedback type AC/DC electronic load simulator consists of two stages of PWM inverters with common DC bus as key parts. The input PWM inverter stage is connected through input filter inductor to the tested power source to constitute the load characteristic simulating part of electronic load; the output PWM inverter stage is connected through the isolating transformer and output filter inductor to the power network to constitute the energy feedback part of electronic load; and the load characteristic simulating part and the energy feedback part are independently controlled. The load characteristic simulating has single instantaneous current value control mode controlling the input load current amplitude and waveform, and the energy feedback has current and voltage double closed-loop control mode including phase lock loop to control the current waveform in the output network side and the bus voltage in the DC side. The present invention has small loss and high network side power factor.

The present invention provides an apparatus and method to combinatorially screen a plurality of electrochemical material compositions for use in an electrochemical cell such as a fuel cell, battery or electro-catalytic cell. The apparatus includes an electrochemical cell with one or more windows, sealed with an infrared (IR) transparent material for direct thermal imaging of an internal electrode, an electronic load for applying a voltage or current to the electrochemical cell, and a device, external to the cell, for monitoring the relative temperature of the internal electrode through each window of the cell when the load is applied. When a load is applied to the cell, the temperature observed through each window may be used as a relative measure of the electrochemical efficiency of the discreet region of the electrode being viewed and of the material compositions contained therein. The electrochemical cell may comprise discreet compositions of electrode materials. The device for monitoring the temperature of the cells may include a thermal imaging device, infrared camera and array of thermocouples.

The invention discloses a universal power-aging testing system which belongs to aging testing systems of electronic products and aims to solve the problems of poor universal property, flexibility, real-time performance and operability of the prior power aging systems. The system comprises a placement frame, a power supply source, an electronic load, a host computer monitor and control subsystem and a control and collection subsystem, wherein the placement frame bears the power supply to be tested, the power supply source supplies power to the power supply to be tested, and the electronic loadis used as the load of the power supply to be tested; and the host computer monitor and control subsystem is used for receiving data of the control and collection subsystem and transmitting test parameters and control commands to the control and collection subsystem; and the control and collection subsystem is respectively connected with the power supply to be tested, the electronic load and the host computer monitor and control subsystem, and used for receiving the test parameters and the control commands of the host computer monitor and control subsystem as well as the status information ofthe power supply to be tested, and also used for adjusting the electronic load signals according to the status information of the power supply to be tested so as to control the aging testing process.

The invention provides an intelligent battery cycle charge-discharge testing device. The device is a secondary battery automatic charge-discharge testing device with low price, high precision and good stability. The device can test main parameters of a secondary battery, has safe and reliable performance and has wide application prospect. The device comprises a power supply module, an electronic load, an acquisition control module, a PC machine and a charge-discharge module, wherein an output of the power supply module is connected with the electronic load and the charge-discharge module; a battery to be tested is connected with the electronic load by the charge-discharge module; a signal acquisition end of the acquisition control module is connected with the battery to be tested, while a control end thereof is connected with the charge-discharge module; and the acquisition control module is on-line with the PC machine by a USB data wire.

The invention relates to an electric energy feedback type electronic load. The input end of the electronic load employs a large-current single-channel access mode. A main circuit mainly comprises a DC/DC conversion circuit, a DC/AC inverter circuit, and an AC filter output circuit, wherein the DC/DC conversion circuit employs a phase-shifted full-bridge circuit to achieve the control of DC input, and boosts DC input voltage. In order to adapt to large-current input, a switching device is formed by parallel connection of a plurality of MOSFETs. The DC/DC conversion circuit is connected with the DC/AC inverter circuit through a DC bus. The DC/AC inverter circuit employs a single-phase full-bridge inverter circuit to control AC output current so as to stabilize the voltage of the DC bus and feeds the AC current back to a power network by a unit power factor. The DC/AC inverter circuit employs an IGBT module as a power device. The AC filter circuit can employ an LC low-pass filter circuit so as to eliminate the higher harmonic waves in the output current of the DC/AC inverter circuit and improve the quality of grid-connected electric energy.

The invention provides a method for measuring the electrical characteristics of a solar cell, comprising: step 1, electrically connecting the solar cell to be tested with an electronic load to form a circuit; step 2, using a control unit to change the resistance value of the electronic load to simulate the formed circuit The working state of the circuit from open circuit to short circuit; and Step 3, during the change process of the above resistance value, collecting the voltage value and current value sequence output by the battery to be tested. A measuring device is also provided, including: an electronic load, adapted to provide a load for the battery under test; a voltage acquisition unit, adapted to acquire the voltage of the battery under test; a current acquisition unit, adapted to acquire the voltage of the battery under test and a control unit adapted to send a control signal to the electronic load to change the resistance of the electronic load, while receiving voltage and current values ​​from the voltage acquisition unit and the current acquisition unit. The measurement efficiency is improved, errors are reduced, and real-time detection is possible.

The invention relates to an electrochemical machining bipolar electrode of a revolution body surface boss structure and the electrochemical machining method of the electrochemical machining bipolar electrode, and belongs to the technical field of electrochemical machining. The method is characterized in that a tool electrode is the bipolar electrode, according to different boss heights, an auxiliary electrode is arranged to be in a fixed and reciprocating motion manner, and a constant positive potential difference is applied to the auxiliary electrode and a workpiece positive pole through an electronic load in the machining process; and as the distance between the auxiliary electrode and a boss is short, according to the electric field distribution principle, the auxiliary electrode with the higher potential can effectively change electric field distribution on the surface of the boss in a machining zone, stray current on the surface of the boss is eliminated, and the effect of protecting the surface of the boss from dispersive corrosion is achieved.

The invention relates to the technical field of rope processing, in particular to a rope capable of prompting the fatigue degree. The rope comprises a rope core, a sheath and a jacket, wherein the rope core is covered with the sheath; the jacket is arranged outside the sheath; circular areas are arranged on the sheath and comprise an inner circular area and outer circular areas, the outer circular area, the inner circular area and the outer circular area are sequentially distributed from top to bottom, and the inner circular area and the outer circular areas are coated with two pigments different from the sheath in color respectively; the width of the jacket is equal to that of the circular areas on the sheath, and the jacket just covers the circular areas of the sheath. The rope capable of prompting the fatigue degree fills in the gap in the prior art, a user can directly see whether the rope reaches or exceeds the own safe load, complex and high-cost equipment such as electronic load sensors and the like are not required, and the rope can be made of various materials and is simple, practical and low in cost.

The invention discloses an impedance measurement system and method for secondary batteries and belongs to a battery measurement technology. The system comprises a battery module, a charging and discharging module, an alternating current frequency scanning module and a signal collecting and processing module. A 203c point of a 203 three-position switch of the charging and discharging circuit is connected with the negative electrode of the battery module 1, and by selecting a switch arm connected with the 203c point, the negative electrode of the battery module 1 is connected with a 202 electronic load and the positive electrode of the battery module 1 through a 203a point to form a discharging circuit. The impedance measurement system and method for the secondary batteries are applied to tests on impedance of the secondary batteries in the working state and can be used for measuring all the single secondary batteries contained in a secondary battery pack in parallel through multiple channels. The Ohm internal resistance, the electrochemical polarization impedance and the concentration polarization impedance of each secondary battery are tested out, the impedance of each secondary battery is analyzed, and the impedance measurement system and method are used for analyzing the charging and discharging performance of the batteries. The service life of the batteries is estimated, and the batteries can run more safely, stably and reliably.