459 results about "Circuit reliability" patented technology

This invention relates to an anti-theft alarm for electric power cable. Wherein, connecting an ac large-resistance inductance in series at least on two wires ends; arranging a dc detection power on wire supply end to form detection port with wire testing circuit with output linked to an alarm circuit; and connecting the detection port to wire on power supply end. This invention simplifies circuit to reduce cost and increase reliability, and brings benefit to treatment in time and loss reduction.

A polymeric layer encompassing the solder elements of a ball grid array in an electronics package. The polymeric layer reinforces the solder bond at the solder ball-component interface by encasing the elements of the ball grid array in a rigid polymer layer that is adhered to the package structure. Stress applied to the package through the ball grid array is transmitted to the package structure through the polymeric layer, bypassing the solder joint and improving mechanical and electrical circuit reliability. In one embodiment of a method for making the polymeric layer, solder elements bonded to external pads on a structure of the package are submerged in a fluidic form of the polymeric layer. The fluidic form is solidified and then a portion of the resulting polymeric layer is removed to make the solder elements accessible for mounting the package to a printed circuit board or other external circuit.

A system for increasing circuit reliability and a method thereof are disclosed. A second thin film transistor (TFT) is used as a contrastive group of a first TFT in the circuit, and variations of device parameters of the first TFT are estimated through the contrastive group. The operation environment of the first TFT is adjusted according to the variations of device parameters of the first TFT so as to compensate the variations of device parameters of the first TFT. Thereby the driving ability of the first TFT can be maintained.

The invention relates to a light-emitting diode (LED) power driving circuit, which comprises a power supply unit, a converting unit, a rectifying and filtering unit and a control unit. The power supply unit converts low-frequency alternating current provided by a power supply network into direct current; the converting unit converts the direct current into high-frequency output pulse; the rectifying and filtering unit filters and rectifies the high-frequency output pulse to obtain stable direct current output needed by an LED lamp; and the control unit samples the direct current output to obtain a voltage sampling signal, and generates a control signal according to an error between the voltage sampling signal and reference voltage through a pulse frequency regulator with a multiplier, wherein the control signal is used for controlling the converting unit to regulate the high-frequency output pulse. Due to the adoption of the pulse frequency regulator with the multiplier, the LED power driving circuit makes an LED driver simple in circuit structure and low in cost; besides, high-power factor output is realized, and the circuit contributes to saving electric energy. Moreover, due to simple circuit and a few devices, the circuit contributes to improving the production efficiency and circuit reliability.

The invention discloses a reliability detecting system for a battery balancing circuit, which comprises a battery, a battery balancing circuit and a reliability detecting circuit. The battery balancing circuit comprises a discharge load, a switch device and a control unit; the reliability detecting circuit comprises a voltage detecting judgment unit; after the discharge load is connected in series with the switch device, the two ends of a series-connected circuit which is formed by the discharge load and the switch device are respectively connected with a positive electrode and a negative electrode of the battery; the control unit sends a control signal to the switch device, and the control device is controlled to be in an off or on state; and the voltage detecting judgment unit judges whether the switch device is in failure through detecting the voltages at the two ends of the discharge load and the voltages at the two ends of the battery. The reliability detecting system for the battery balancing circuit can detect that whether the switch device used in the battery balancing circuit is damaged or not, so that the reliability of the battery system is improved.

A system and method for predicting a product characteristic are provided. The system includes a data acquisition module configured to acquire raw data associated with to-be predicted prediction information, a data conversion module configured to convert the raw data into computable normalized data, and a result prediction module configured to calculate a prediction result based on the normalized data and compare the prediction result with a predetermined standard value. The result prediction module includes a neural network prediction model configured to calculate the prediction result based on the normalized data. The prediction information may include reliability and/or yield to prevent major reliability or yield problems from occurring during manufacturing of semiconductor devices.

The invention discloses a dual-frequency receiving antenna and a dual-frequency rectifying antenna. The dual-frequency receiving antenna and the dual-frequency rectifying antenna are used for solving the problems that an existing dual-frequency receiving antenna is large in size and small in gain, an existing dual-frequency rectifying antenna is large in size, can not receive weak energy and is not suitable for remote transmission, and a rectifying circuit is poor in reliability. The dual-frequency receiving antenna comprises a rectangular radiating patch. A Z-type groove used for achieving dual-frequency characteristics is formed in the radiation patch. The lower end of the radiation patch is sequentially connected with a dielectric substrate layer and a metal earth plate through a coaxial line. The coaxial line is in circuit connection with the rear end of the radiation patch. An air dielectric layer is formed between the radiation patch and the dielectric substrate layer. The portions, arranged between the radiation patch and the dielectric substrate layer, outside the coaxial line are provided with metal sheets in a bilaterally-symmetric mode. The upper ends of the metal sheets are connected with the radiation patch. The lower ends of the metal sheets are connected with the dielectric substrate layer. One end face of the radiation patch is further connected with the metal sheets connected with the dielectric substrate layer. The dual-frequency receiving antenna and the dual-frequency rectifying antenna can be widely applied in the fields of communication, medical treatment, industry and the like, for microwave power transmission.

The invention relates to a circuit reliability evaluating method based on the signal probability. The method includes reading an integrated circuit gate level netlist, analyzing the netlist to acquire connection structures of gate nodes, and providing a segmentation algorithm to segment the circuit into a plurality of modules; allowing each module to be one sub circuit, utilizing the PTM method onto the sub circuits, and calculating the reliability of each module sequentially; evaluating the reliability of the entire circuit according to the principle of calculating the independent event joint probability through the module reliability product. By the aid of the segmentation algorithm, the majority of modules are guaranteed being free of redundancy on functions and overlap on structures. The problem that only small-scale circuits can be evaluated by a PTM method is optimized, and the evaluating method can be applied to large-scale circuits; in addition, the TP method, the EPP method and the optimized PTM method are integrated to develop a circuit reliability evaluating platform which can be applied to the circuit designing step to calculate the reliability, and the designed structure can be adjusted conveniently and timely.

The present invention includes analysing gallium arsenide monolithic microwave integrated circuit, thereby obtaining chip concerned rate of failures and package and external environment concerned rate of failures; according to chip concerned rate of failures and package and external environment concerned rate of failures sum to evaluate gallium arsenide monolithic microwave integrated circuit degree of reliability. The present invention provides guideline for gallium arsenide monolithic microwave integrated circuit rate of failures level and reliability evaluating.

The invention discloses a power supply switching circuit of an external power supply and a power supply by a battery and a switching method. The power supply switching circuit comprises a switch, a first voltage reducer, a second voltage reducer, a third voltage reducer, a voltage reference module, a voltage divider, a comparator and a level transfer module, wherein when voltage of the external power supply is not lower than a predetermined voltage threshold value, the level transfer module controls the switch to cut off the battery to a loaded access, and when voltage of the external power supply is lower than the predetermined voltage threshold value, the level transfer module controls the switch to communicate the battery to the loaded access. With the adoption of the power supply switching circuit and the switching method disclosed by the invention, a set of switches is just used to select power supplies of the system, so that the structure of the control circuit is simplified and the reliability of the circuit is improved.

The invention discloses a three-phase power grid phase loss detection method and a circuit. The three-phase power grid phase loss detection method comprises the following steps: obtaining a first line voltage and a second line voltage of a power grid side through a voltage transformer; calculating a third line voltage according to the first line voltage and the second line voltage obtained through the voltage transformer through a processor; and judging three-phase power grid phase loss according to the magnitude relation of the first line voltage, the second line voltage and the third line voltage through the processor. The invention further discloses the three-phase power grid phase loss detection circuit. Due to the fact that the voltage of the power grid side is obtained through the voltage transformer, the problems that current-limiting resistance loss is large, heating is serious, circuit reliability is low and the like in an existing detection circuit can be solved. Meanwhile, due to the fact that the processor is adopted for calculating line voltages and judging according to the magnitude of the line voltages, specific phase loss conditions of a three-phase power grid can be judged.

The invention discloses an input and output common-ground boost-buck photovoltaic grid-connected inverter and a control method thereof. The photovoltaic grid-connected inverter disclosed by the invention comprises five switch tubes, three diodes, two inductors and a capacitor. The input and output common-ground boost-buck photovoltaic grid-connected inverter has the beneficial effects that voltage at two ends of a ground parasitic capacitor of a photovoltaic cell panel is zero and remains unchanged; leakage current is effectively eliminated; input and output of the inverter are common-grounded and are beneficial to building of a three-phase system and the applications of the inverter can be further expanded; boosting and bucking can be achieved by a single stage of the inverter, the grid-connected voltage requirement can be achieved by a DC side only by low voltage and the application range of the inverter is expanded; a transformer does not exist in a circuit, the required active and passive devices are few and a system is high in efficiency, small in volume and light in weight; and an electrolytic capacitor does not exist in the circuit, the reliability of the circuit is improved and the service life of the circuit is prolonged.

The invention discloses a self-adaptive switching frequency regulator circuit which mainly solves the problem that in the prior art, a switching convertor only has high efficiency in a narrow load range. The self-adaptive switching frequency regulator circuit comprises a pattern discrimination module, a threshold selection module, fundamental oscillation logic, jitter frequency control logic and a controlled current source. The pattern discrimination module detects external feedback voltage FB to generate two comparison logic signals which are subjected to logical operation in the threshold selection module, low-threshold voltage of a comparer in the fundamental oscillation logic is determined, the fundamental oscillation logic outputs clock signals and is used for driving the jitter frequency control logic to generate a set of control signals to control output current of the controlled current source, frequency jitter is achieved, and electromagnetic interference of the switching convertor is lowered. The self-adaptive switching frequency regulator circuit is high in reliability, all functions can be integrated in a chip, and the self-adaptive switching frequency regulator circuit can be applied to various power supply management systems.

The invention discloses an integrated circuit interconnection reliability analysis method for modeling based on neural network parameters. The method comprises the steps of acquiring training data by ANSYS simulation; building a neural network model structure based on EM reliability; and training a reliability neural network model and acquiring a model result. The advantages that the neural network has a strong non-linear mapping function and a rapid learning ability are utilized to model an EM reliability input and output relation via the neural network and train the model, results with respect to reliability under various work conditions are acquired after the model is built, reliability data under different conditions can be predicted in very short time, the defect that simulation time is long due to the fact that the reliability results under all input conditions need to be simulated when traditional ANSYS finite element software analyzes circuit reliability in different conditions, and the method provided by the invention is significant in research on interconnection reliability of the integrated circuit.

Provided is a distributed battery management system and method for lead-acid storage battery pack equalization. Multiple lead-acid storage batteries are connected in series to form a series lead-acid storage battery unit. Multiple series lead-acid storage battery units are connected in parallel to form a lead-acid storage battery pack. The output end of the lead-acid storage battery pack is connected with a master control unit. Each lead-acid storage battery is connected with a slave control unit. A constant-current/voltage equalization device in the master control unit is connected with the corresponding lead-acid storage battery pack through the equalization switch of the slave control unit. Each slave control unit acquires the output voltage signal of the corresponding lead-acid storage battery and sends the output voltage signal to the master control unit. The master control unit acquires a maximum voltage signal and a minimum voltage signal of the multiple lead-acid storage batteries. When a voltage difference between the maximum voltage signal and the minimum voltage signal is greater than a preset threshold, the master control unit controls the constant-current/voltage equalization device and the equalization switch to perform equalization operation on the lead-acid storage battery corresponding to the minimum voltage signal. The distributed battery management system and method achieve organic combination of cost and circuit reliability.

The invention discloses a matrix vector multiplication double-track logic circuit based on DNA composite strand displacements and a method thereof; the method comprises the following steps: firstly building a three-row-three-column matrix and three-row-one column vector multiplication system according to a composite strand displacement combination mechanism; building a third-order matrix vector multiplication operated digit logic circuit; using a double-track idea to convert the digit logic circuit into a third-order matrix vector multiplication operated dual-track logic circuit; converting the dual-track logic circuit into a seesaw logic circuit; converting the seesaw logic circuit into a biochemical logic circuit; finally using Visual DSD simulation software to verify the outputted result and parse the three-row-three-column matrix and three-row-one column vector multiplication system complex dynamics behaviors, and enabling the simulation result to prove the result validity. The method provides basic theory basis for building a higher-order matrix vector multiplication in a later time and matrix and matrix multiplication logic operations, thus promoting the biology computer development, and improving the bio-computer logic circuit reliability.

The invention discloses an ARCP flexible switch circuit with voltage clamping function, which comprises a first master power switch and a second master power switch with one ends respectively connected with a DC power supply positive pole and a negative pole and the other ends connected with a filtering circuit; a series branch composed of a third switch and a resonant inductor with one end connected with a zero potential reference end of the DC power supply and the other end connected with the input end of a filtering circuit; and a fourth clamping fly-wheel switch and a fifth clamping fly-wheel switch with one ends respectively connected with the DC power supply positive pole and the negative pole and the other ends connected with one point between the third switch and the resonant inductor, and used for introducing the excess energy in the series branch to a circuit loop when the third switch is switched off. The inventive circuit can consume or absorb the excess energy in the resonant inductor, reduce the peak high voltage in the ARCP circuit due to the parasitic capacitance in the resonant inductor, improve the reliability and efficiency of the circuit, and has the advantage of low cost.

The invention discloses a quenching reset circuit for a single photon avalanche diode detector. The reset circuit comprises three parts such as a quenching circuit, a reset circuit and an avalanche signal output portion, and is characterized in that the quenching circuit is composed of five MOS transistors, and the five MOS transistors form a positive feedback circuit for voltage variations of a node a; the reset circuit is composed of 17 MOS transistors; and the avalanche signal output portion is composed of eight MOS transistors. The advantages are that the quenching reset circuit is high in reliability, and a reset operation is ensured to be performed after avalanche current generated by the SPAD (Single Photon Avalanche Diode) detector is sufficiently quenched because of adoption of a Schmitt trigger with high threshold level. In addition, the waveform quality of avalanche pulses generated by the circuit is high, avalanche signals are converted into narrow pulses through a NOR gate, and then the narrow pulses are shaped by a two-stage inverter and act as final output avalanche pulses, so that the output pulses are enabled to be steeper, and processing of a counting circuit is facilitated.

The invention discloses a short-circuit protection circuit for an APF high-power IGBT. The short-circuit protection circuit comprises the working control circuit of the IGBT and the short-circuit protection circuit of the IGBT, the working control circuit of the IGBT is used for controlling the IGBT to work or not, and the short-circuit protection circuit of the IGBT is used for monitoring the short circuit currents of the IGBT and preventing the short circuit of the IGBT from causing overvoltages to damage the IGBT through a slowly lowered grid voltage circuit. The short-circuit protection circuit of the IGBT comprises the working control circuit of the short-circuit control circuit, the detecting circuit of the short-circuit protection circuit, the slowly lowered grid voltage circuit and a latch protecting resetting circuit, wherein the working control circuit is used for controlling the short-circuit protection circuit to work or not, the detecting circuit is used for detecting the voltage of the IGBT, the slowly lowered grid voltage circuit is used for slowly lowering grid voltages, and the latch protecting resetting circuit is used for protecting and locking a PWM, and completely turning off the IGBT. The short-circuit protection circuit for the APF high-power IGBT has the advantages of improving the reliability of the working circuit, and reducing the overvoltages in a turning off process by adopting the soft turn-off mode of slowly lowering IGBT grid voltages when a short circuit occurs.

The invention belongs to the technical field of LED backlight display, and provides a two-in-one power source for LED backlight and a LED backlight display. The two-in-one power source for LED backlight is characterized in that LED load is equivalent to stable voltage and is subjected to current sampling by a sampling circuit; a sampling circuit of the sampling circuit is amplified by virtue of a constant current control circuit; corresponding duty cycles of an excitation control circuit are regulated according to the output of the constant current control circuit; meanwhile, the voltage is subjected to buck conversion by utilizing direct current-direct current conversion circuit and the electricity is supplied to a main board. The circuit can normally work in a relatively-wide input voltage range; compared with the prior art, the two-in-one power source has the advantages that a BOOST circuit is eliminated, the structure is simple, the cost is low, and the conversion rate can reach 82 percent; meanwhile, boost inductance is not needed, and the problem of poor circuit reliability and the like possibly caused by the boost inductance can be solved.

The invention relates to a flexible direct-current converter valve and a bridge arm damping module energy taking circuit thereof. The energy taking circuit of the bridge arm damping module comprises at least one high-voltage isolation power source which corresponds to sub modules in arrangement. The input of one high-voltage isolation power source is connected with a direct-current support capacitor of one sub module. The output of each high-voltage isolation power source is in power supply connection with a damping module control loop though a current limiting resistor and a voltage support capacitor. The bridge arm damping module energy taking circuit of the invention is highly reliable and low in cost, and does not affect the power supply sub modules.

The invention discloses a single-phase voltage boosting-reducing type photovoltaic inverter capable of inhibiting leakage current and a control method thereof. The inverter consists of six switch tubes, two diodes, one DC inductor, two filtering inductors with identical inductance values and a filtering capacitor. The single-phase voltage boosting-reducing type photovoltaic inverter has functions of boosting voltage and reducing voltage and has a wide input voltage range; the four power switches of the bridge arms of the inverter are in a power frequency state and only two power switches are working at a high frequency; the switch loss is small, a dead area does not need to be set for driving pulse, and circuit reliability is high. The single-phase voltage boosting-reducing type photovoltaic inverter capable of inhibiting leakage current and the control method thereof enable voltage on two ends of a parasite capacitor to ground of the photovoltaic system does not contain high frequency components, and enable current leakage to be effectively inhibited.

The invention discloses a neutralizing bootstrap cascode amplifier suitable for millimeter-wave power amplification. Structurally, the amplifier is formed by cascading a pair of bootstrap capacitor common-gate transistors and a pair of capacitor neutralizing common-source transistors up and down, a first neutralizing capacitor is bridged on the gate of the first common-source transistor and the drain of the second common-source transistor, and a second neutralizing capacitor is bridged on the gate of the second common-source transistor and the drain of the first common-source transistor. Bootstrap capacitance formed between the neutralizing capacitors and the source and the drain of the common-gate transistors eliminates the impact of parasitic capacitance of the drains of the common-source transistors, so that the gain and stability of the amplifier are improved; and the cascode amplifier increases the swing of an output signal without increasing the voltage swing of the transistor, so that the output power of the amplifier is improved, and the circuit is more reliable.

The invention relates to a three-dimensional metal-based Printed Circuit Board (PCB) assembly structure assembly structure in a light-emitting lamp, which consists of a single continuous metal-based circuit board and a plurality of light-emitting components on the upper surface of the metal-based circuit board. Each light-emitting component is connected with the metal-based circuit board by a circuit; parts on the metal-based circuit board, which are provided with the light-emitting components, are not positioned on the same plane or curved surface; and the metal-based circuit board is of a three-dimensional structure. The invention also relates to the light-emitting lamp with the assembly structure and a manufacturing method of the assembly structure. Due to the adoption of the three-dimensional metal-based PCB circuit board assembly structure which is of the structure, the corresponding light-emitting lamp and the manufacturing method, the heat conduction contact surface is larger; a single module assembly has simple and practical structure; the process is simplified; the three-dimensional metal-based PCB circuit board assembly structure is convenient and rapid to process, is beneficial to mass mechanical production, has low cost, has high circuit reliability and stable and reliable performance and is firm and durable; the assembly stability and the mechanical strength of a circuit board assembly are improved; and the three-dimensional metal-based PCB circuit board assembly structure is difficult to deform and has wide application range.