3283 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 relates to a measuring array with an earth connection point (5) for determining the insulation resistance (R_iso) of an energized electrical apparatus or of an installation with a supply voltage U_B with a positive pole (6) and a negative pole (7), two switches (S₁, S₂) or a corresponding two-way switch being provided for creating a current path between one of the two poles and said earth connection point (5) in order to determine the insulation resistance (R_iso) generally obtained when one or a plurality of insulation faults occur at any potential reference, two measurements being performed one after the other for determining the insulation resistance, the first switch (S₁) being closed and the second switch (S₂) open during the first of these two measurements and the first switch (S₁) being open and the second switch (S₂) closed during the second of these measurements.

The invention relates to the technical field of soldering pastes, in particular to a halogen-free tin-bismuth-copper soldering paste and a preparation method thereof. A soldering flux of the halogen-free tin-bismuth-copper soldering paste consists of the following components in percentage by weight: 20 to 40 percent of polymerized rosin, 1 to 6 percent of rosin amine, 4 to 8 percent of thixotropic agent, 5 to 10 percent of organic acid, 5 to 10 percent of organic amine, 1 to 5 percent of antioxidant, 0.5 to 3 percent of surfactant and an organic solvent. The halogen-free tin-bismuth-copper soldering paste is mainly characterized by adopting the organic acid and the organic amine serving as activating agents and comprising no halogens at all, so not only the solderability is not reduced, but also the expansion rate and the insulation resistance value of the soldering paste are improved, and simultaneously the corrosivity of residues after soldering to a base material is reduced and the service life of the soldering paste is prolonged; and particularly, the peak temperature of the soldering paste during soldering is lower in favor of reducing the thermal damages to electronic components.

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.

A device for detecting the insulation resistance of a high-voltage battery system of a motor vehicle that includes a high-voltage battery and a high-voltage component which is operatively connected to terminals of the high-voltage battery via converters. The device includes a reference resistor operatively connected to the terminals of the high-voltage battery via switches, with a voltage measurement device configured to detect the voltage present between each respective terminal and a reference potential of the vehicle; a voltage measurement device configured to measure the voltage between the terminals; and a coupling circuit configured to monitor the high-voltage component when the converters are open.

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 relates to an automobile insulation resistance detection circuit and method, and the circuit comprises a negative bleeder resistor, a positive bleeder resistor, a first sampling resistor, a second sampling resistor, a third sampling resistor, a fourth sampling resistor, a fifth sampling resistor, a sixth sampling resistor, a negative switch, and a positive switch. One end of the negative bleeder resistor is connected with the negative electrode of a detected battery, and the other end of the negative bleeder resistor is grounded. One end of the positive bleeder resistor is connected with the positive electrode of the detected battery, and the other end is grounded. One end of the first sampling resistor is connected with the negative electrode, and the other end of the sampling resistor is connected with one end of the negative switch. The other end of the negative switch is connected with one end of the second sampling resistor, and the other end of the second sampling resistor is grounded. One end of the third sampling resistor is connected with the positive electrode, and the other end of the third sampling resistor is connected with one end of the positive switch. The other end of the positive switch is connected with one end of the fourth sampling resistor, and the other end of the fourth sampling resistor is grounded. One end of the fifth sampling resistor is connected with the positive electrode, and the other end of the fifth sampling resistor is connected with one end of the sixth sampling resistor. The other end of the sixth sampling resistor is connected with the negative electrode. According to the scheme of the invention, the circuit can improve the detection precision of insulation resistance.