1597 results about "Insulation resistance" patented technology

An insulation resistance determining system (50) comprises an insulation resistance determining portion configured by connecting a coupling capacitor (52), a detection resistor (54), and a pulse oscillating circuit (56) in series with a common mode potential measuring point (30), and an insulation resistance determining portion having a filter (58) which processes an AC signal (v_x) at a junction between the coupling capacitor (52) and the detection resistor (54), an amplifier (60), a wave-peak value detection circuit (62), and a controller (70). The controller (70) has functions for detecting a drop in insulation resistance in response to an output of the wave-peak value detection circuit (62); for requesting an HVCPU (40) to change the common mode potential so as to determine a failure of the insulation resistance determining portion; and for determining a failure of the insulation resistance determining portion from an output change of the wave-peak value determining circuit (62) between before and after the common mode potential change.

A ground-fault detecting device includes a power source which is electrically insulated from a vehicle body, a pulse signal generator which generates a pulse signal having a high level and a low level which appear repeatedly in a prescribed cycle, a detection resistor which is connected to the pulse signal generator and the power source, a coupling capacitor which is connected to the detecting resistor in series, an integrator which integrates a difference between a first reference voltage and a detection voltage of the pulse signal at a connecting point of the detection resistor and the coupling capacitor over an integration interval, and a ground-fault determinant which judges whether a ground fault has occurred on the basis of an output of the integrator. The integration interval is at least part of a high-level interval and a low-level interval of the pulse signal.

The invention is concerned with low rosin type halogen-free and cleaning-free flux using for lead-free solder paste, belonging to flux field. About the existing rosin type flux, the leftover after welding is high and the leavings with halogen has cauterization. The matter of this invention is 5 to 20 wt percent of organic acid activator, 10 to 29 wt percent of modified rosin, 1 to 10 wt percent of binder, 0.5 to 6 wt percent of stabilizer, 1 to 6 wt percent of surfactant, 1 to 8 wt percent of corrosion inhibitor, 1 to 10 wt percent of thickener, and the rest is solvent with high boiling point. The copper mirror after welding is not penetration, and this invention without halogen has high insulation resistance and good assistant jointing capability. The viscosity of matched solder paste is advisable to solve the high content of rosin in the flux and great smoke. The leftover after welding is colorless and transparent film and it dose not absorb water with the normal temperature without clearing to fit for the welding demand of common production.

The invention relates to a battery management system performance test platform and a testing method based on semi-physical simulation and belongs to the field of systems. According to the battery management system performance test platform and the testing method based on semi-physical simulation, the problems existing in the aspects of effectiveness, practicality, accuracy, generality and comprehensiveness of an existing battery management system testing device and method are solved. A BMS to be tested and a simulation control and emulating unit of the test platform are connected with a CAN bus. A signal output end of an insulation resistance testing device, a signal output end of an insulation voltage resistant testing device, a signal output end of a 24-channel single-body voltage simulator, a signal output end of a high-voltage source, a signal output end of a current source and current reversing module, a signal output end of a high-accuracy temperature environment box, a signal output end of an insulation resistance simulator and a signal output end of a direct current power source are respectively connected with corresponding signal input ends of the BMS to be tested. The BMS to be tested is arranged in a high-low-temperature operational testing box. The testing method comprises the steps of safety testing and the comprehensive testing of state parameter measuring accuracy, SOC estimating accuracy, a battery fault diagnostic function, a heat management function and environment adapting performance and is used for testing the battery management system.

A manufacturing method for manufacturing a solar panel including a solar cell and an outer housing and an inspection method for inspecting a solar panel generating system, include a step of performing one of a withstand voltage test and an insulation resistance test between a live electrical section electrically connected to the solar cell and a conductor section of the outer housing, and thereafter a step of applying a voltage between the live electrical section and the conductor section. In this way, a residual charge left subsequent to the withstand voltage test or the insulation resistance test is reliably removed within a short period of time.

The invention relates to a lead free soldering clean free soldering flux with the mass percentage of organic acid activating agent 1. 5-3. 5%, surface active agent 0. 04-0. 6%, organic amine and derivant 2. 0-5. 0%, with the rest being film forming matter. The said organic acid could be one or more of the aliphatic acid mono acid or bi-acid, aromatic acid, or amino acid. The said surface active agent is one or more of the nonion surface active agent, and the said organic amine and the derivant being ethanediamine, tetramethylenediamine, diethyl ethanolamine and so on, with the said film forming material being diethyl ethanolamine or resin. The soldering flux does not have halogen, being environmental protective, good in welding, welding spot being full and luminous, without residue, no corrosion, high in isolation resistance.

A method of patterning an insulation layer is described. The method includes preparing a film stack on a substrate, wherein the film stack comprises a cap layer, a SiCOH-containing layer overlying the cap layer, and a hard mask overlying the SiCOH-containing layer. The method further includes transferring a pattern through the film stack by performing a series of etch processes in a plasma etching system, wherein the series of etch processes utilize a temperature controlled substrate holder in the plasma etching system according to a substrate temperature control scheme that achieves etch selectivity between the SiCOH-containing layer and the underlying cap layer.

The invention discloses a method and a device for detecting power battery insulation resistance of an electric automobile. Two circuits of universal input/output interfaces of a micro-controller are respectively and externally connected with positive and negative insulation switch circuits. Positive and negative insulation switch relays are gated. Insulation resistance sampling voltage is output. The sampling voltage is amplified by an operational amplifying circuit, isolated by a voltage isolation chip and input in an analogue-digital conversion unit of the micro-controller. An insulation resistance value of a current power battery is calculated by the micro-controller according to an algorithm, transmitted to a battery management system through a communication module in the form of message and used by the battery management system. According to the method and the device disclosed by the invention, the problem that positive leakage, positive leakage or positive and positive leakage cannot be judged by the traditional insulation resistance detection device is effectively solved; the leakage degree of the current power battery can be precisely measured; and potential safety hazards resulted from inaccuracy of the insulation resistance are stopped.

The invention provides a photovoltaic power generation system and control method. The photovoltaic power generation system comprises photovoltaic cells and an inversion device which is electrically connected with the photovoltaic cells and is used for converting direct currents generated by the photovoltaic cells to alternating currents, and further comprises a PID circuit, an insulation resistance detection device and a control unit. On the one hand, because first insulation resistance between the positive electrode of photovoltaic cells array and the ground and second insulation resistance between the negative electrode of the photovoltaic cell array and the ground are respectively detected by the insulation resistance detection device and faults can be detected before the whole photovoltaic power generation system operates, the photovoltaic power generation system solves the problem that safety can not be determined because the negative electrode is grounded, and accordingly the insulation state of a negative-electrode cable or the insulation state of a cell panel negative-electrode end can not be determined, and the cell electrodes is grounded and the PID phenomenon is successively eliminated on the other hand.

The invention relates to the technical field of battery production equipment, in particular to a metallic shell power battery assembling line and an assembling process. The metallic shell power battery assembling line comprises an electric core feeding conveying and transition transferring apparatus, a hot-pressing and Hi-pot testing apparatus, a battery pre-weldingdust-collecting and insulation resistance testing apparatus, a cover board feeding welding dust-collecting and flattening apparatus, a core-closing fixture apparatus, an automatic electric core rubberizing apparatus, an automatically-posted protective film thickness measurement apparatus and an automatic battery shell-entering apparatus arranged in sequence based on stations. The metallic shell power battery assembling line is simplified in structure and higher in production efficiency.

The present invention provides a ferrite core which has a structure in that plating is prevented from elongating, which can maintain insulation resistance between electrodes and can prevent short-circuit between a conductor wire and the electrode without damaging adhesion properties while mounted and, moreover, which can stabilize a Q value (loss characteristic) of a product. The ferrite core includes a wound core and flanges integrally formed at both ends of the wound core, and each of the flanges includes a plurality of legs provided so as to rise from one surface of the wound core and having a top surface to be formed with electrode, and each leg is tapered off toward the top surface and an vertical corner portion formed between adjacent side faces thereof has a curved surface.

The invention relates to a halogen-free non-cleaning soldering flux for a lead-free solder wire, and belongs to the soldering flux field. According to the weight ratio, the invention comprises the following elements that: 4 to 18 wt percent of organic acid active agent, 10 to 30 wt percent of organic solvent, 1 to 6 wt percent of pasting agent, 0.2 to 3wt percent of stabilizer, 0.5 to 5wt percent of thixotropic agent, 0.5 to 4wt percent of surface active agent, 0.5 to 5wt percent of rust inhibition, and the rest comprises colophony. The invention includes no halogen, the speculummetal has no breakthrough after being welded, the insulation resistance is high, and the soldering performance is good, the problem of the potential solder joint short circuit caused by the soldering flux of the prior welding wire that the colophony content is too high, the smoke is large and the derelict is easy to be flaked away is solved, the invention is smooth and has no absorption of moisture under normal temperature, no cleaning is required after being welded, and the welding requirement of normal product can be met.

The vehicular insulation resistance detection apparatus includes a cyclic signal generating unit that generates a cyclic signal, a first resistor that has one end to which the cyclic signal is applied, a first capacitor that has one end connected to the other end of the first resistor and the other end connected to a high-voltage circuit, a second capacitor that has one end connected to the other end of the first resistor, a second resistor that has one end connected to the other end of the second capacitor and the other end connected to a low-voltage ground that is a circuit ground of a low-voltage circuit, a series circuit that includes a diode and a third resistor connected in series, and is connected in parallel with the second capacitor, this diode having a forward direction coincident with a direction from the other end of the second capacitor to the one end of the second capacitor, a voltage detection unit that detects a voltage between the low-voltage ground and the other end of the second capacitor as a detection signal, and an insulation resistance detection unit that detects a resistance value of an insulation resistance based on an amplitude of the detection signal.

The invention discloses a halogen-and-rosin-free antibacterial no-clean soldering flux for a lead-free solder. The halogen-and-rosin-free antibacterial no-clean soldering flux comprises the following components in percentage by weight: 0.5-10.0% of an organic acid activator, 5.0-30.0% of a cosolvent, 0.1-1.0% of a nonionic surfactant, 0.01-0.2% of a phenolic antioxidant, 0.01-0.1% of a bactericide, 0.01-0.02% of a corrosion inhibitor, 0.1-5.0% of a film-forming agent and the balance of deionized water. The soldering flux for the lead-free solder has the advantages of no halogen and rosin, antibacterial effect, excellent weld-aid property, bright and full welding spots, good spreadability, fewer post-welding residues and being free from a cleaning procedure; and in addition, a welded copper mirror is non-corrosive and nontoxic, and the surface insulation resistance of a welded substrate is more than 1*10+8 ohms, which meets the requirements of the electronical industry standard.

The invention discloses a locomotive car duct pilot earth detecting circuit, which comprises a positive bus-bar, a negative bus-bar, a load resistance, line-to-ground isolated resistances of the positive bus-bar and the negative bus-bar, wherein, two detecting branch circuits are connected between the positive or the negative bus-bar and the earth respectively, one of which is composed of a known resistance and the other one is composed of the known resistance and a switch board in series connection. At the same time, an earth detecting method and a thread break error detecting method are further provided to be used for the locomotive car duct pilot earth detecting circuit. The locomotive car duct pilot earth detecting circuit can not only judges the earth errors existing in the locomotive car duct pilot by detecting the size of the line-to-ground isolated resistance of the positive and the negative bus-bar, but also detects the errors of thread breaking, which overcomes the shortcomings of traditional methods, alarms the earth errors in advance, eliminates the hidden safety trouble caused by the earth errors to regular running of locomotive cars and improves the normal using efficiency of locomotive cars.

The invention provides a battery management main system suitable for a new energy automobile and a control method. The battery management main system includes an MCU module, a battery management module, a current detection module, a liquid crystal display module, a whole set of voltage and insulating performance measurement module, a heat management module, a clock module and a memory module; the MCU module reads current data of the current detection module, total voltage and insulation resistance data measured by the whole set of voltage and insulating performance measurement module and terminal voltage of a single battery and temperature data which are sent by an acquisition module through CAN channels, and estimates internal states SOC and SOE of a battery pack, the heat management module is driven to perform heat management on the battery pack, battery state information and alarm information are sent to the liquid crystal display module, and corresponding diagnostic information is stored in the memory module. The beneficial effects of the battery management main system are that the system can realize utilization and protection an automobile battery to the greatest extent, improve efficiency of energy utilization, saves energy and reduces emissions, and guarantees safety of use.

The present invention is a high-sensitivity insulation resistance detection method and circuit for an ungrounded DC power supply systems. When the ratio of the voltage of the positive bus to that of the negative bus exceeds a preset range, the DC current is injected into the ungrounded DC power supply systems. DC power supply systems have essentially some grounded stray and external capacitors, so some of the injected DC current will flow into the grounded capacitor, increasing the voltage of the fault bus and the leakage current. The proposed method increases the leakage current by the injection of DC current, so the current sensor can detect the leakage current from which the insulation resistance can be calculated. The DC current injection method can significantly improve the detection of ground insulation faults in ungrounded DC power supply systems.

Disclosed is an apparatus for measuring an insulation resistance that may calculate each of a cathode terminal-side insulation resistance value and an anode terminal-side insulation resistance value of a battery. The apparatus for measuring an insulation resistance according to the present disclosure forms different first and second circuits by selectively connecting an insulation resistance measurement unit to a cathode terminal or an anode terminal of the battery, and calculates a cathode terminal-side insulation resistance value and an anode terminal-side insulation resistance value from first and second insulation detection voltages applied to the insulation resistance measurement unit and simultaneous circuit equations derived from the first and the second circuits. Accordingly, quantitative insulation resistance values of the cathode terminal and the anode terminal of the battery may be each obtained.

The invention discloses an ethylene propylene rubber insulation material for longitudinal high-voltage watertight cables of ships and warships and a production method thereof. The method comprises the following steps: adding the ethylen e-propylene-diene mischpolymere, age resister and fire retardant into a banbury for banburying for 3.5min; adding argil, white carbon black and paraffin wax for continued banburying for 2min; adding active agent, and discharging after banburying for 1.5min; filtering the rubber compound with a three-layer filter screen (namely a 60 mesh filter screen, a 60 mesh filter screen and a 80 mesh filter screen) on a rubber filter; and beating into cornucopla on a double-roller mill, adding vulcanizer and co-crosslinker, then beating into cornucopla for 7 times, grinding and slicing after finishing the steps, and then cooling, wherein the materials are as follows in parts by weight: 100 parts of ethylen e-propylene-diene mischpolymere, 1-5 parts of vulcanizer, 1-4 parts of age resister, 15-70 parts of fire retardant, 0.5-10 parts of active agent, 10-20 parts of argil and 2-4 parts of paraffin. The prepared insulation material has the characteristics of low smoke, no halogen, fire resistance, high machinery strengthen, and high insulation resistance, good flexibility, elasticity and viscosity, and can be used for the ships and warships.

The invention relates to a novel environment-friendly soldering flux for low-silver SnAgCu unleaded soldering paste, belonging to the field of unleaded solder soldering flux. The invention aims at providing a soldering flux suitable for the low-silver SnAgCu unleaded soldering paste. The soldering flux comprises the following components: 5.0-13.0% of activator, 32.0-41.0% of solvent, 0.8-5.0% of corrosion inhibitors, 1.0-6.0% of thixotropic agent, 2.0 -9.0% of paste forming agent, 0.3-2.5% of stabilizer, 0.5-5.0% of surfactant and 35.0-48.0% of modified rosin. The activator is the compound of a plurality of organic acids, has wide boiling point distribution space, can achieve good activation effect in the whole soldering process, can be mostly volatilized, sublimated or decomposed at the brazing temperature and ensures no corrosion after the soldering. The soldering flux has the advantages of no halogen content, good soldering aiding property, few and hard-film-shaped residuals after the soldering, high insulation resistance, and the like.

The present invention provides an induction heating device for a fuel cell system, which can rapidly heat coolant during cold start-up, control the power consumption depending on the voltage of a fuel cell stack, and ensure the insulation resistance by separating a heating unit, which is in contact with the coolant, from the outside. That is, the present invention provides an induction heating device for a fuel cell system, in which an insulating housing is provided in a coolant circulation line, a heater for heating coolant is provided in the housing, and a high frequency controller for controlling the power consumption of the heater is provided at the outside of the housing such that the coolant can be rapidly heated during cold start-up, precisely control the power consumption depending of the voltage of a fuel cell stack, and improve the insulation performance by separating the heater as a heating unit, which is in contact with the coolant, and the high frequency controller and a coil as a power unit with respect to the insulating housing.

The invention relates to a circuit and a method for detecting a direct-current power ground insulation resistor. The circuit comprises resistors R1 to R5 and switches S1 to S2, wherein the resistors R1 and R3 have the same resistance value; the resistors R2 and R4 have the same resistance value; one end of the resistor R2 is connected to an anode of a direct-current power supply through the resistor R1, and the other end of the resistor R2 is grounded through the switch S1; the resistors R1 and R2 and the switch S1 form a first detection branch circuit; one end of the resistor R4 is connected to a cathode of the direct-current power supply through the resistor R3, and the other end of the resistor R4 is grounded through the switch S2; the resistors R3 and R4 and the switch S2 form a second detection branch circuit; and the resistor R5 is connected with the first detection branch circuit or the second detection branch circuit in parallel. The circuit has the advantages as follows: when resistance values of positive and negative ground insulation resistors R+ and R- of the direct-current power supply are reduced in a uniform amplitude way or close to each other, the resistance values of the resistors R+ and R- can be still detected, and detection precision of the resistors R+ and R- can be also guaranteed.

Multilayer ceramic chip capacitors which satisfy COG requirements and which are compatible with reducing atmosphere sintering conditions so that non-noble metals such as copper and copper alloys thereof may be used for internal and external electrodes are made in accordance with the invention. The capacitors exhibit desirable dielectric properties (high capacitance, low dissipation factor, high insulation resistance), excellent performance on highly accelerated life testing, and very good resistance to dielectric breakdown. The dielectric layers comprise a composite oxide formed by calcining rare earth titanates, barium titanate, together with other metal oxides such as MgO, CaO, ZnO, MnO₂, ZrO₂, SiO₂, Ga₂O₃, Nd₂O₃, Nb₂O₅, and Y₂O₃.

The invention discloses a cable fault detection and aging analysis method. According to the insulation resistance oscillation theory of the frequency domain, the cable fault detection and aging analysis method is characterized in that a fault location model is established by analyzing the oscillation characteristics of frequency domain impedance on the basis of oscillation wave spectrum analysis of the frequency domain impedance acquired by a non-destructive test system or a destructive test system, and then test oscillation impedance spectrum defect is compared with an internal simulation curve, so that long-distance accurate fault location can be realized, and the fault types can be also effectively distinguished. Compared with the prior art, the method not only is capable of realizing accurate multipoint positioning of faults, but also is capable of carrying out fault type recognition and insulation aging state analysis; in the whole detection and analysis processes, artificial experience is hardly depended; the method is suitable for a cable with the length of 1m-1,000km, and is especially suitable for a cable with the length of more than hundreds of kilometers.

An electric leakage detecting apparatus, in an electric leakage detecting apparatus which is insulated from a chassis ground and detects electric leakages of a battery, is provided with: a voltage dividing circuit that divides an output voltage of the battery; an electric leakage determining circuit provided at a rear stage of the voltage dividing circuit, that determines the presence of an electric leakage based on a voltage detected by a circuit that respectively connects to a positive electrode side insulation resistance or a negative electrode side insulation resistance of the battery; and a dark current inhibit circuit in which a switch and a resistance are connected in parallel, that is inserted between at least either one of wiring that connects a positive terminal of the battery and the voltage dividing circuit, and wiring that connects a negative terminal of the battery and the voltage dividing circuit.

An electric wire and cable conductivity, tensile strength and aging comprehensive testing device comprises a testing control system, an analytical balance, an electrical bridge with a clamp, an insulation resistance tester, a tension testing machine, a high-temperature low-temperature humidity thermal cycling testing machine, an air-exchange aging testing machine, an ozone-proof aging testing machine, an xenon lamp weather-proof testing machine, a gas analysis device and a test control system. The device can test mechanical performance of an electric wire and cable, electric performance of the electric wire and cable and performance of the electric wire and cable under the influence of environment at a time, can effectively reduce work load of a test of the electric wire and cable, enables the test of the mechanical performance, the electricity performance, and the performance of the electric wire and cable under the influence of the environment to be concentrated and effective, and can synchronously test components of released gases of a cable with a sheath in the aging process.

The invention relates to the technology of photovoltaic grid-connected inverter, in particular to an online detection method of insulating resistance to ground of a photovoltaic grid-connected inverter. The method comprises the following steps of: by sampling an output voltage VPV of a photovoltaic cell and enabling a switch S1 in a resistance switch circuit to be in opening or closing state, disconnecting or connecting a resistor R5 from or to an upper bridge arm, and then sampling a voltage signal of a dividing voltage output end of a lower bridge arm to obtain a voltage ratio equation of anode to ground of photovoltaic cell and cathode to ground of the photovoltaic cell, thereby online calculating a insulating resistance R+ of anode to ground of the photovoltaic cell and an insulating resistance R- of cathode to ground of the photovoltaic cell in real-time and accurately. The method has simple calculation process and high detecting precision; by adopting the method, the online and real-time detection of anode-to-ground resistance of the photovoltaic cell and the cathode-to-ground resistance of the photovoltaic cell is achieved, the photovoltaic grid-connected inverter is guaranteed to work safely and reliably.

An object is to detect an insulation failure of a DC circuit with high sensitivity and in safety by means of a simple detection circuit. An insulation resistance measurement device of this invention is a device for measuring an insulation resistance to ground of a DC source circuit and is provided with connection terminals for connections to a positive electrode and a negative electrode of a series power supply, switch elements connected between the connection terminals and the ground potential and configured to switch connections between the connection terminals and the ground potential, resistive elements connected through the switch elements between the connection terminals, respectively, and the ground potential, and a voltage detection unit for detecting voltage drops in the resistive elements.

In insulator including alumina as a main component, a Na component in the insulator is set in the range of 0.07 to 0.5 wt % as Na2O. While the Na component content is as high as to have conventionally been regarded to be beyond the common sense, with this range of the Na component content, insulation resistance, mechanical strength and the like at high temperature are unexpectedly not reduced and an insulator with performances comparable to those of an insulator from conventional low soda alumina lower in Na component content than the above described range can be obtained. As a result, medium soda alumina and regular soda alumina that are much lower in cost than conventionally used low soda alumina can be used instead of the low soda alumina, so that dramatic reduction in production costs of insulator 2 for a spark plug 100 and in addition, of the spark plug 100 using the insulator 2 are realized.

The invention relates to the technical field of soldering paste, in particular to halogen-free lead-free soldering paste for a radiator and a preparation method thereof. The soldering paste consists of a soldering flux and soldering tin, wherein the soldering flux consists of the following substances in percentage by weight: 30 to 55 percent of resin, 4 to 8 percent of organic acid, 2 to 5 percent of organic amine, 3 to 10 percent of thixotropic agent, 1 to 2 percent of corrosion inhibitor, 1 to 2 percent of surfactant and a solvent. The soldering paste has no halogen, is environmentally-friendly, and has the advantages of small corrosion, good welding performance, plump welding spots, high expansion rate and insulating resistance of more than 1.0*10<12>ohm.