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372results about How to "Simple circuit" patented technology

Single slice battery essential resistance and voltage on-line testing system for fuel cell pile

The invention relates to an online system for testing the essential resistance and the voltage of a single cell of a fuel cell stack, comprising a testing unit, a programmed AC driving source, a blocking condenser, an electric current detecting module, a keyboard, an LCD unit and a storage unit, which is characterized in that the programmed AC driving source is serially connected with the blocking condenser and then parallel connected with an output end of a fuel cell, and the testing unit is used for controlling the frequency and the amplitude value of the AC driving source periodically through a communication interface and collecting the voltage and the electric current signals of each single cell in order for computing essential resistance; the electric current detecting module, the keyboard, the LCD unit and the storage unit are respectively connected with the testing unit which communicates with a main controller of galvanic pile and other equipments through the communication interface. The invention has compact and legible circuit, high reliability, moderate cost, high measurement precision, quick measurement speed and ample and scalable interfaces, and the invention satisfies the requirements of the real-time and high-precision testing of the essential resistance and the voltage of the single cell of the fuel cell stack.
Owner:WUHAN UNIV OF TECH

Multipath LED constant current drive circuit suitable for non-isolated converter

The invention discloses a multipath LED constant current drive circuit suitable for a non-isolated converter, which comprises a DC/AC converting circuit, a current-equalizing transformer, rectifier filter circuits and LED loads. The multipath LED constant current drive circuit is characterized in that the DC/AC converting circuit converts the input direct voltage into alternating voltage, and the alternating voltage is input to the current-equalizing transformer; the current-equalizing transformer performs balancing control on each path of current; and after passing through each rectifier filter circuit, the current is output to each LED load respectively. The multipath LED constant current drive circuit has the advantages that: 1, the current-equalizing transformer realizes the equalization of a plurality of paths of LED load current, and the cost is low; 2, the current equalization control is realized by the current-equalizing transformer automatically without additional control circuits, and the circuit is simple and has high reliability; and 3, the current-equalizing transformer has a high efficiency to achieve the current equalization, and even the voltage difference of two paths of LEDs is large, the consumption for realizing the current equalization is small.
Owner:INVENTRONICS HANGZHOU

Startup and shutdown circuit

The invention relates to startup and shutdown technology of electronic products, in particular to a startup and shutdown circuit. The startup and shutdown circuit comprises a startup and shutdown key, a system main control chip, a hard startup circuit, a soft shutdown circuit, a forced shutdown circuit and a system power supply, wherein the hard startup circuit, the soft shutdown circuit, the forced shutdown circuit and the system power supply are all formed by discrete components. The hard startup circuit, the soft shutdown circuit and the input end of the forced shutdown circuit are all connected with the startup and shutdown key. The output end of the hard startup circuit is connected with the system power supply, the output ends of the soft shutdown circuit and the forced shutdown circuit are connected with the system power supply through the hard startup circuit, and the soft shutdown circuit is further connected with the system main control chip. The startup and shutdown circuit is composed of all discrete components and is simple and low in standby power consumption and cost compared with startup and shutdown circuits controlled by an advanced reduced instruction set computer machine (ARM)/micro controller unit (MCU)/Super input/output (IO)/electronic computer (EC)/south bridge chip. Simultaneously the startup and shutdown circuit has high circuit reliability, can achieve a startup and shutdown control method same as that of x86 platform products (personal computer (PC) and Notebook) under the condition of non-x86 platform products, and increases a new user experience effect.
Owner:GUANGDONG VTRON TECH CO LTD

Novel chaos source based on quadratic-term nonlinear effect and signal amplitude and polarity control method

InactiveCN102957530ASimple circuitAmplitude and polarity controllable reductionSecuring communicationVIT signalsCapacitance
The invention discloses a novel chaos source circuit based on quadratic-term nonlinear effect and a corresponding signal amplitude and polarity control method. The novel chaos source circuit is characterized by implementing output of a special chaos attractor by adopting a multiplying circuit consisting of three multipliers, an integration summing circuit consisting of seven resistors (including rheostats or potentiometers), three capacitors and three operational amplifiers, and an inverse-phase amplifying circuit consisting of four resistors and two operational amplifiers. The feedback intensity of product signals is partially and synchronously adjusted by the potentiometers, so that the partial and whole control on the amplitudes of output signals can be realized; and the polarities of linear feedback signals can be selectively controlled by switches, so that the polarity control on two paths of chaos signals can be realized. The partial amplitude control provided by the invention gives up the amplitude variation of a variable, and the polarity control only aims at two state variables. The novel chaos source circuit and the signal amplitude and polarity control method have the advantages of simple signal source circuit, special attractor, adjustable amplitude and controllable polarity, and can be widely applied to the fields of chaos radars, secret communication and the like.
Owner:JIANGSU INST OF ECONOMIC & TRADE TECH

Automotive anti-collision radar signal processing device by use of 77GHz millimeter waves

InactiveCN102253370ASimple circuitTakes up little space in the carRadio wave reradiation/reflectionRadio frequencyVIT signals
The invention relates to an automotive anti-collision radar signal processing device, particularly relates to an automotive anti-collision radar signal processing device by use of 77GHz millimeter waves, and belongs to the technical field of communication and radar. The device comprises a radio frequency module, a power supply module, an FPGA (Field Programmable Gate Array) module, four groups ofreceiving circuits, two groups of transmission circuits, a clock and an RS232 interface module, wherein each group of receiving circuit consists of a front receiving amplification circuit, a receiving filter module, a rear receiving amplification circuit and an A/D (analog to digital) conversion module; and each group of transmission circuit consists of a D/A (digital to analog) conversion module, a transmission attenuation circuit and a transmission filter circuit. The device has the advantages of concise circuit, small occupied vehicular space, low cost and low power consumption; a signal processing board can be used for effectively amplifying and filtering a signal received by a radar antenna; and a high-performance low-noise filter chip is adopted in secondary amplification, so that high-frequency noise is effectively reduced, the accuracy of sampled data is guaranteed, and the dynamic range of signals is effectively improved.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY +1
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