2119 results about "Weak current" patented technology

Disclosed is an improved electrochemical sensor for the detection of an analyte in a fluid test sample. The electrochemical sensor is of the type in which the fluid test sample is drawn into a capillary space and the improvement to the sensor involves an arrangement where a portion of the sensor's counter electrode is placed on the edge of the capillary space in a relationship to the sensor's working electrode such that if the capillary space is not completely filled there will be generated only a very weak current. When the sensor is connected to a properly programmed current detector, the weak current caused by the underfilling of the capillary space will be detected as an error and will notify the user of the sensor that the test should not be continued.

A distribution cabinet (1) for accommodating weak-current distribution installations, in particular for arranging outdoors, havinga base box (2),an outer cabinet body (3) with at least one door (4),a cabinet cover (5), andan inner installation frame (6),the installation frame (6) being made up of profile sections (50), of which the cross-sectional shapes has two insertion pockets (51a,b), of which the insertion directions (52a,b) run at right angles to one another.

The invention belongs to the technical field of a control system and particularly relates to a hotel guest room intelligent control system, which comprises a power supply module, a control module, an input module, an output module, a communication module, a server, a guest intelligent mobile terminal control system, wherein the control module comprises a main control box, a guest room information issuing system, a multifunctional gate indicating card, a music door bell, a networked power taking switch, a touch screen switch, a slight touch press key switch, a user card and a networked temperature controller, the guest room information issuing system is connected with the main control box through a 485 bus, and the multifunctional gate indicating card, the music door bell, the networked power taking switch, the touch screen switch, the slight touch press key switch, the user card and the networked temperature controller are respectively connected with the main control box. Compared with the prior art, the hotel guest room intelligent control system can realize the control on the environment through adopting various modes such as the slight touch type control panel, the guest intelligent mobile terminal control system terminal and remote control, so the energy saving is realized, and the electric energy waste is reduced. In addition, the hotel guest room intelligent control system adopts the modular design, the mutual interference of the self strong and weak current parts inside the whole system can be reduced, the loop number can be configured according to the guest room loop requirements, and the cost is saved.

This invention relates to a photoelectromagnetic integrated advanced oxidation method and its device for waste water, which first of all acidizes the waste water, then strongly magnetizes it to generate energy of physical change and chemical change then enters into a photo-catalyzing box to be oxidated mostly to CO2 and water under the actioin of photo-catalyst, ultraviolet light, ozone and oxydol, in which, molecular chains of some hard-degradated substances are broken, then the waste water is micro-electrolysed to adsorb and recover the hard degraded substances under the action of extra low voltage, weak current and air, ozone and oxydol to get rid of COD, color degree, deodorizatin and disinfectant finall to filter it by diatomite and filter out suspending substances to reach the standard or recover it.

A power feed system for a vehicle provided with a plurality of nodes (4a, 4b, 4c) provided with a load control portion (9) for controlling an electric load disposed at each portion of a vehicle, respectively, a power line (1) for supplying power to each node, and a multiplex transmission line (2) connecting each node to each other, comprising an abnormal current detection portion (5) disposed in a line for receiving power feed from the power line at each node for detecting abnormality of a load current, a detection signal generation portion (10) that starts to receive power when abnormality is detected at the abnormal current detection portion and sends a weak current as an output signal, a diagnostic signal line (3) in common to each node, connected to the detection signal generation portion for transmitting the signal from the detection signal generation portion, and a switching portion (6) for switching the power feed from the power line to the load control portion or the detection signal generation portion.

A distribution cabinet (1) for accommodating weak-current distribution installations, in particular for arranging outdoors, having a base box (2), an outer cabinet body (3) with at least one door (4), a cabinet cover (5), and an inner installation frame (6), the installation frame (6) being made up of profile sections (50), of which the cross-sectional shapes has two insertion pockets (51a,b), of which the insertion directions (52a,b) run at right angles to one another.

In a direct current cutoff switch1, a PTC 5, which is a non-linear resistor, is parallel connected to a contact circuit composed of a fixed contact 4-2 and a movable contact 8-2 via electrodes 5-1. When the switch is closed, no current flows in the PTC 5 with a prescribed resistance value at 25° C., since voltage between both the electrodes 5-1 is almost “0”. When the switch is opened in order to cut off current, the contacts form a closed circuit since the PTC 5 is parallel inserted between the fixed contact 4-2 and the movable contact 8-2. For this reason, it is difficult for surge voltage to occur and an arc hardly occurs between both the contacts. The PTC 5 instantaneously heats due to passing current, reduces the resistance value and passes peak current. Then, the resistance value rises and becomes stable in a high value such that weak current which is negligible at 42V, which is rated voltage. Thus, current is substantially cut off.

The invention discloses an Internet-of-Things platform system and a cloud platform thereof, and a local terminal. The cloud platform includes an IoT gateway, a streaming media service module, a rulesengine module, a general service module, a management center, a visualization module and an open gateway. The local terminal includes an edge gateway and a sensing device, and the edge gateway includes an acquisition module, a video server and a display module. The edge gateway is configured to connect an IoT-related hardware facility and the sensing device in the weak current system to obtain data of the sensing device and upload the data to the cloud platform; and the cloud platform is configured to connect downwards with the sensing device and the local terminal to obtain data and connect upwards with service and application. According to the technical scheme, the Internet-of-Things platform system and the cloud platform thereof, and the local terminal have good openness and good safety, and high-reliability and cross-system message channel capability.

The invention discloses a weak current detection device for radiation detection, which is used for detecting large dynamic weak current and requires recording and displaying measured data in real time. The device comprises a DC power module, a weak current amplifying and I / V switching circuit, an A / D conversion circuit, a central control unit, a range selection switching circuit and a user terminal, wherein the central control unit is used for finishing the functions of data processing, range switching and data communication; and the range selection switching circuit realizes automatic range selection by selecting a feedback channel of a feedback network. The weak current detection device realizes automatic range switching, adopts a T-shaped resistance network structure in a feedback network of the weak current amplification and an I / V switching circuit U2, improves the equivalent resistance of the feedback network and avoids the temperature drift and capacitive reactance influence brought by high impedance generally. Therefore, the technical problems that the conventional weak signal measurement equipment has low range, slow response, low resolution, and the like, so that the precision reaches 0.1pA or below and the resolution is 10fA.

The invention discloses a method for automatically detecting an air conditioner outdoor unit control panel, which adopts different detection modes according to different functional circuits on the outdoor unit control panel, and mainly comprises communication circuit detection, direct current fan drive circuit detection, sensor sampling circuit detection, high and low level input circuit detection, weak current drive circuit or relay circuit detection and the like. The special method for automatically detecting the air conditioner outdoor unit control panel provided by the invention not only can prevent the control panel to be detected from being damaged during the detection process, can qualitatively determining and quantitatively detecting all the functional circuits of the control panel to be detected through adopting a mode which combines manual judgment and automatic judgment, but also can detect both two states of 'on' and 'off' of a switching input, so the accuracy of the detection result is improved, and the detection efficiency is also taken into consideration.

The invention discloses a weak current amplifier with pA (picoamperes)-mu A (microamperes) range. The weak current amplifier comprises an input circuit, a current-voltage conversion circuit, a zeroing circuit, a voltage linear amplification circuit, a lowepass filtering circuit, a gain control circuit and a power circuit, wherein the current-voltage conversion circuit is used for realizing current-voltage conversion by adopting an electrometer operational amplifier with high input impedance; an input end of the current-voltage conversion circuit is connected with the input circuit, an output end of the current-voltage conversion circuit is connected with the voltage linear amplification circuit; the current-voltage conversion circuit is further connected with the zeroing circuit and the gain control circuit; and an output end of the voltage liner amplification circuit is connected with the lowpass filtering circuit for filtering out interference of high-frequency noise which is finally sent to an output circuit to be output. The technology can be used for solving the defects of the conventional weak current measurement process, such as complicated implementation, long preheating, difficulty in zeroing operation and large instrument volume. The weak current amplifier has the advantages of strong anti-interference capacity, high reliability and high measurement speed and can realize amplification of low-frequency weak current with a pA-muA range.

The invention relates to a pulse electronic accelerator nano-pico ampere electron beam flow measuring system, relating to an electronic accelerator pulse electron beam flow measuring system, in particular to the nano-pico (10-10A / cm2) micro beam flow measurement of millisecond pulse, belonging to the electron radiation environment ground simulation and test field. The pulse electronic accelerator nano-pico ampere electron beam flow measuring system is composed of a novel inclined-bottom faraday cup, three coaxial cables and a nano-pico level current amplifier. The measurement result can be obtained by oscilloscope or data acquisition card. The inclined-bottom faraday cup electron collection system resolves the collection efficiency problem of high energy electrons (MeV), to improve collection efficiency. The adopted three coaxial cables can reduce the interference of electromagnetic field. The nano-pico ampere level current amplifier resolves the stable current linear amplification problem under electron radiation, and converts weak current signals to voltage signals, thus being convenient for data acquisition of oscilloscope or data acquisition card. The invention resolves the measurement problem of nano-pico ampere pulse electron beam flow, to confirm the accuracy, real-time property and easy use of measurement.

The invention relates to an electrospinning direct-writing closed-loop control system and a control method, which relate to electrospinning direct writing equipment. The invention provides the electrospinning direct-writing closed-loop control system which is capable of realizing the controllable adjustment of the electrospinning direct-writing nano fibre diameter and improves the jet injection stability of spinning and the uniformity of nano fibre diameter and the control method of the electrospinning direct-writing closed-loop control system. The system comprises a liquid storage tank, a liquid feeder, a spinning nozzle, a collecting plate, a weak current detector, a temperature sensor, a humidity sensor, a data collector, a control computer, a direct current high voltage power supply and an adjustable frame. The system establishes a fuzzy controller to obtain the jet injection state by detecting the spinning current, adjusts the applied voltage and the flow rate of the feeding liquid according to the change of the spinning current so as to avoid the influence of various interference factors and realize long time stable jet of the spinning jet flow. The set current of the fuzzy controller is adjusted to control the electrospinning direct-writing nano fibre diameter. The electrospinning direct-writing closed-loop control system is beneficial to improving the controllability of the electrospinning direct-writing nano fibre diameter and well promoting the industrialized application of the electrospinning direct-writing technology.

The invention discloses a power management power supply system for an electronic electric energy meter. The system comprises a weak current main power supply loop, a power monitoring circuit, a power-down memory power supply circuit, a battery power supply circuit, a low power consumption wake-up circuit and a main control chip low power consumption management circuit, wherein the low power consumption wake-up circuit is connected with the main control chip low power consumption management circuit; the main control chip low power consumption management circuit is connected with the weak current main power supply loop; the power-down memory power supply circuit is connected with the battery power supply circuit and the weak current main power supply loop; a power management chip in the weak current main power supply loop is a multi-path output DC / DC high-efficiency power management chip; the main power chip is a DC / DC high-efficiency power chip; the power chip in the power-down memory power supply circuit is a DC / DC high-efficiency power chip; and finally, the weak current main power supply loop has a plurality of paths of effective power outputs all the time. Due to the adoption of the system of the invention, the high-performance chip can be applied to the electronic electric energy meter and the electronic electric energy meter can work stably in each power supply operating mode.

The invention discloses an automobile warm air control method and an automobile warm air control device. The method includes steps: using a control circuit to load weak-current voltage; using a PTC (positive temperature coefficient) heater to load strong-current voltage; using the control circuit to detect temperature of the PTC heater and comparing the temperature of the PTC heater with a target temperature value; and using the control circuit to detect the voltage and the current of a strong-current circuit of the PTC heater through a photocoupling strong-weak current isolation circuit. The automobile warm air control method and the automobile warm air control device are characterized in that a driving circuit receives duty cycle pulse width modulation signals outputted by the control circuit by the aid of an IGBT (insulated gate bipolar transistor) to lead a collector and an emitter to be on or off; and a strong-current power source is applied to the PTC heater through the IGBT. Strong-current voltage of different frequencies is outputted under pulse width modulation control and duty cycle change to realize linear control of the PTC heater. The automobile warm air control method and the automobile warm air control device have the advantages that overhigh surface temperature of the PTC heater can be effectively avoided so that reliability is high and risks and potential hazards are avoided; electrodeless power adjustment and smooth temperature control are realized, and overheating and overcooling are avoided; and cost is low.

The invention relates to a slip electrical contact material for feeble current, the material is Ag-Cu-Ni-Re alloy, Ag-Cu-Zn-Ni-Re alloy or Ag-Cu-Pd-Zn-Ni-Re alloy, wherein Cu has a mass percentage of 0.1-10.0%, Ni has mass percentage of 0.01-0.6%, Re has a mass percentage of 0.01-0.5%, Zn has a mass percentage of 0.1-5.0%, Pd has a mass percentage of 0.1-105%,and the balance Ag. The invention solves the following problems of feeble current slip contact alloy under high: unstable contact resistance, low contact reliability, low hard and low wearing quality. The slip electrical contact material prepared by combining the material with copper or copper alloy has good quality and long life in a temperature scope ranging from -40 DEG C to 80 DEG C.

The invention discloses a graphene nanopore-microcavity-solid-state nanopore structure based DNA sequencing device and a method. The sequencing device is mainly composed of a graphene nanopore-equipped graphene microstrip, an inverted pyramid-shaped microcavity in a silicon-based substrate, and a solid-state nanopore at the top of the microcavity. During sequencing, a sequencing reaction chamber is divided into two parts by the graphene nanopore-microcavity-solid-state nanopore structure. A single-stranded DNA molecule passes through the graphene nanopore linearly under the effect of an electrostatic field, then enters the inverted pyramid-shaped microcavity, and finally comes out from the solid-state nanopore. Weak current measuring equipment is utilized to measure longitudinal ionic current blocking caused by the DNA molecule passing activity in the nanopore and the transverse conductance change around the nanopore in the graphene microstrip. Further, a synchronous data recording and processing system is employed for analytical calculation of bi-directional data, thus realizing sequence analysis of the single-stranded DNA molecule.

Provided is an optical fiber measurement method and device of blade tip clearance. A multipoint orientation reflecting compensation type optical fiber is adopted to carry out distance measurement; laser emitted by a laser device in a working wavelength range is transmitted to the surface of an object to be measured through a fiber probe, is reflected back to the fiber probe after being reflected through the surface of the object to be measured, and then enters multiple channels of receiving optical fibers respectively; filtering is carried out on laser entering the receiving optical fibers through optical filters, energy of laser entering the multiple channels of receiving optical fibers in the working wavelength range after the laser is reflected by the surface of the object to be measured is obtained respectively, the energy of the laser is converted into weak current signals through photoelectric detection, the weak current signals are amplified into current or voltage signals for being collected through a signal amplification filtering circuit, comparison processing is carried out by collecting the multiplexed output current signals or voltage signals, and the distance between the optical fiber probe and the object to be measured is obtained. The invention further discloses a measurement device for achieving the method.

The invention discloses a weak current integrated UPS (uninterrupted power supply) power system applied to urban mass transit and a power supply method. The weak current integrated UPS power system comprises a power source input distribution system, a UPS and storage battery system, an intelligent distributor system and a UPS monitoring system, wherein the UPS and storage battery system is connected with the power source input distribution system and the intelligent distributor system in sequence; and UPSs distributed in weak current systems of urban mass transit are integrated under the premise of meeting certain conditions and requirement, so that an integrated UPS power system meeting the requirements of relevant weak current systems can be formed, and UPS can be provided for weak current systems in the positions such as stations, car depots, parking sites and control centers. The weak current integrated power system can improve the reliability, availability and maintainability of the UPS system, reduce the investment in the UPS, reduce the configuration for the total capacity of the storage battery and increase the spare total capacity of each system, thereby facilitating centralized monitoring and management and maintenance of the UPS.

The invention discloses a multi-channel laser echo time measurement system based on an FPGA (Field Programmable Gate Array) chip, and relates to the field of photoelectric measurement. The system solves the problems that the existing single-point detector cannot meet requirements of multiple channels, high accuracy, wide measurement range, rapid measurement and the like. The system comprises an array detector used for converting a received laser echo signal into a weak current signal, a plurality of preamplifiers with the same quantity as array detector pixels, a plurality of threshold comparators with the same quantity as the preamplifiers, and the FPGA chip of a plurality of channels with the same quantity as the threshold comparators, wherein the preamplifiers are used for amplifying the weak current signal to a voltage signal; the threshold comparators are used for comparing the voltage signal with reference voltage, and generating a timing stop pulse signal used for marking the laser echo signal; and the FPGA chip is used for measuring a time difference between the received timing stop pulse signal and a timing start pulse signal, and obtaining the pulse flight time. The system realizes high-accuracy, wide-range and high-speed array signal measurement through multi-channel signal processing.

The invention provides an air conditioning system integral optimized control device. The device comprises a host (101), a weak current control system (102), and a strong current control system (103), wherein both the weak current control system (102) and the strong current control system (103) are connected in parallel with the host (101) via an RS485 communication interface. The control device provided by the invention realizes the control completely compatible and parallel with an original central air conditioning control circuit, and has a local control mode and a remote control mode, wherein the local mode is applicable to site button operation, and the remote mode is applicable to remote computer remote control operation. The remote mode is divided into an automatic mode and a manualmode, wherein the manual mode can realize remote inching equipment operation, and the automatic mode can realize the full-automatic, failure-free and optimized operation of the central air conditioning system.

The invention discloses an alternating current mains supply isolation zero crossing checking circuit combined with low-voltage power line carrier wave communication signal coupling, belonging to the field of low-voltage power line carrier wave communication and control. The circuit comprises a carrier wave signal coupling circuit, a zero crossing checking circuit and a protective circuit, wherein the carrier wave signal coupling circuit receives and sends the carrier wave signal in the carrier wave communication process in a mode of combining series resonance with a coupling transformer, and the active power consumption and the inactive power consumption of a system can be effectively lowered. in the zero crossing detection circuit, a biasing circuit is designed according to the conduction condition of a Darlington tube, the capacitance characteristics and the optocoupling working condition, so as to accurately detect the zero crossing point time of the alternating current mains supply; the carrier wave signal coupling circuit and the zero crossing detection circuit share one protective circuit to prevent impact interference, such as pulse or surge and the like; and strong current and weak current are completely isolated to guarantee system safety. In the alternating current mains supply isolation zero crossing checking circuit, a low-voltage power line carrier wave coupling circuit is combined; the characteristics of components are used for realizing the zero crossing point detection function; the coupling circuit and the detection circuit share one protective circuit, and the whole circuit is easy to realize, thereby correspondingly lowering cost, and lowering the active power consumption and the inactive power consumption of a system; and especially the zero crossing point detection accuracy required for carrier wave communication is guaranteed.

The invention discloses an automatic detection method for a control panel of an air-conditioning indoor unit, and achieves the purposes that different measures are adopted to detect different functional circuits on the control panel of the indoor unit. The automatic detection method comprises the following steps: detecting a communication circuit; detecting a motor type drive circuit; detecting a sensor sampling circuit; detecting a high-low-level input type circuit; and detecting a weak current type drive circuit or a relay type circuit. By adopting the automatic detection method, damage to a to-be-detected control panel is avoided in the detecting process, qualitative detection and quantitative test of all functional circuits of the to-be-detected control panel can be achieved through both manual judgment and automatic decision, and on and off states for switching input can be both detected, so that not only is the accuracy of detection results improved and the detection efficiency is drawn into consideration.

The invention discloses a universal detection chip system for weak signals of a sensor. The chip system comprises a detection subsystem and an auxiliary subsystem which are both connected with the sensor, wherein the detection subsystem comprises two current detection channels and a voltage detection channel; the current detection channels realize detection to weak current signals input by the sensor through current and voltage conversion, voltage amplification and analog-digital conversion; the voltage detection channel first converts weak voltage signals input by the sensor into current signals and then outputs the current signals to the current detection channels, thereby indirectly realizing the detection of weak voltage signals; the auxiliary subsystem is used for providing required bias current, voltage, a clock and control signals for the sensor and the detection subsystem. The chip system has the characteristics of low noise, low power consumption, high precision, high integration level and the like, can be integrated on a substrate together with the sensor to form a lab-on-chip.

The invention relates to a self-adaption quasi-PRD control method for a photovoltaic grid-connected inverter. The self-adaption quasi-PRD control method for the photovoltaic grid-connected inverter relates to the technical field of photovoltaic grid-connected inverter control, and aims to solve the problems that the existing photovoltaic grid-connected inverter has poor adaptability on power grid impedance change, and the stability of a photovoltaic grid-connected system is poor in a weak current grid. The method comprises the following steps of injecting disturbance current with specific frequency into a power grid through a disturbance current injection method; then obtaining a relational expression of current controller parameters and power grid impedance based on the principle of closed loop pole parameter configuration; when the power grid impedance Rg and power grid inductance Lg are changed, realizing self-adapting adjustment on controller parameters Kp, Kr and Kd so as to adapt to the ever-changing power grid impedance, so that the adaptability and the stability of the photovoltaic grid-connected inverter control system are improved. The self-adaption quasi-PRD control method for the photovoltaic grid-connected inverter can be used for controlling the photovoltaic grid-connected inverter.

The invention discloses a circuit and a method for weak current detection and belongs to the current detection field. Geminate field effect transistors are employed by an input end to form a difference amplifier, and I-V conversion of a weak current is carried out; a voltage signal after conversion is sent to two sets of proportion operation circuits having symmetric in-phase input modes for proportion operation amplification; difference operation amplification of the voltage signal after proportion operation amplification is carried out, and a difference operation amplification voltage magnitude is measured. According to the method and the device, the junction type geminate field effect transistors are employed to form the difference amplifier as an input level, so input impedance is improved, and the relatively high common-mode inhibition ratio is acquired; the precise proportion operation circuit structures in the symmetric in-phase input modes are employed as the middle level, input impedance is further improved, and measurement precision is improved; the multiple operation amplifier difference amplification detection technology is employed, conflicts of useful-signal weakness and relatively high common-mode interference can be effectively solved, and high gain, high input resistance and the high common-mode inhibition ratio of the detection circuit are realized.

A direct current measuring device comprising at least one first magnetic sensor and at least one second magnetic sensor sensitive to a magnetic field generated by an electric current flowing in a conductor. The measuring device comprises a processing unit connected to the magnetic sensors and designed to generate an output signal dependent on the measurement signals supplied by the magnetic sensors. Said processing unit comprises selection means supplying the output signal dependent, for weak electric currents on the first measurement signals from at least one first magnetic sensor, and dependent, for strong electric currents, on the second measurement signals from at least one second magnetic sensor.

The invention discloses a control circuit of a time relay. A timing / delay circuit comprises a trigger control signal input node control and a control output node out connected with the control input end of a relay output circuit, and further comprises an electric-leakage trigger circuit with a trigger switch, and a trigger signal processing circuit, wherein a normally-open trigger contact of the trigger switch is optionally connected with a weak switch-on element and an outer trigger terminal in parallel, the trigger switch, the weak switch-on element and the outer trigger terminal are connected mutually to form a node which is connected with an input node of the trigger signal processing circuit, and the trigger switch is connected with the other end of the weak switch-on element to form a node which can be directly connected to any one of a pole L or a pole N on the alternating-current input side of a step-down rectifying voltage stabilizing circuit. The electric-leakage trigger circuit provides a control signal to the trigger signal processing circuit and afterwards triggers the timing / delay circuit, thus controlling the relay output circuit to realize the on / off state switching of a load, and when a current generated by a parallel element loop does not exceed a predetermined current threshold, the time relay is not triggered. The control circuit of the time relay provided by the invention is simple and allows weak current to flow through a normally-open contact serving as the trigger device without leading to false trigger.

The present invention relates to sewage treating technology, and is especially one advanced electrochemical catalytic oxidation process of treating heavy metal containing sewage. During the process, various kinds of stuffing with functions of catalysis, redox, adsorption, flocculating, etc. separately are added. When the sewage passes through the stuffing, heavy metal ions under the action of applied weak current and inflated air are reduced into free metal atoms, which are then separated out from the water through adsorption, neutralization, flocculation, etc. The water is further filtered for reaching the draining standard, and the deposited heavy metal sludge may be recovered and reused.