59results about How to "No leakage current" patented technology

An insulation detection circuit comprises a first resistor, a second resistor, a third resistor and a first switch, wherein one terminal of the first resistor is connected with a first input positive terminal; the other terminal of the first resistor is respectively connected with one terminal of the first switch and one terminal of the second resistor; the other terminal of the first switch is grounded; the other terminal of the second resistor is connected with an input negative terminal through the third resistor, so that the insulation detection circuit can be really isolated from the ground, thereby avoiding the production of leakage currents; and the precision of the insulation detection circuit is relatively high. An inverter comprises a main body and the insulation detection circuit, wherein the insulation detection circuit is connected in parallel to an input terminal of the inverter, so that the first switch of the insulation detection circuit can be turned off after the work of the insulation detection circuit is completed, thereby really isolating the insulation detection circuit from the ground, avoiding the production of the leakage currents and guaranteeing normal work of the inverter.

A waveguide photodetector and forming method thereof are provided. The method of forming a waveguide photodetector includes: forming a waveguide on a silicon-on-insulator(SOI) substrate(100), depositing a first oxide coating over the waveguide and on the SOI substrate(102), creating a seed window through the first oxide coating to a bulk silicon layer of the SOI substrate(104), depositing a photodetector material into the seed window and on top of the first oxide coating over the waveguide(106), depositing a second oxide coating over the photodetector material and over the first oxide coating deposited over the waveguide and on the SOI substrate(108), and applying thermal energy to liquefy the photodetector material(110). Thereby, the leakage current characteristics of the waveguide photodetector are improved.

The invention discloses a high-assembly-accuracy grid-control electronic gun which comprises a cathode hot wire component, a heat shield combination, a supporting cylinder combination, a control grid combination, a shadow grid combination, a gun shell combination and a magnetism shield welding cylinder combination. The electronic gun is reasonable in design, assembling parts of the electronic gun are screened out through a large number of experiments, and the electronic gun with high accuracy is obtained by assembling. The electronic gun is long in service life and high in reliability and stability, a specific-shaped electron beam can be provided for a coupled cavity traveling-wave tube, the assembling requirement of the high-standard coupled cavity traveling-wave tube can be well met, and the shortcomings of the prior art can be overcome.

The invention discloses a digital display high-sensitivity conductivity and high-resistance resistivity measuring circuit which comprises a measuring circuit body, a precise amplifying and convertingcircuit and a digital A/D converting and displaying circuit in sequential connection. The measuring circuit body sends voltage signals of a measured resistor to the precise amplifying and converting circuit, and the voltage signals are adjusted to voltages for ratio method resistivity measurement after being subjected to impedance conversion and resistivity partial pressure by the precise amplifying and converting circuit. The precise amplifying and converting circuit sends adjusted reference voltages and adjusted measurement signal voltages to the digital A/D converting and displaying circuit, and the reference voltages and the signal voltages are converted into corresponding display values by the digital A/D converting and displaying circuit to be displayed. The invention further provides a digital display high-sensitivity conductivity and high-resistance resistivity measuring method. When the to-be-measured Rx changes according to the coefficient k, the measurement signal voltages/reference voltages can change in inversion proportion according to the same change coefficient k, and therefore conductivity measurement is realized, calculation errors in the prior art can be eliminated, and the measurement precision is high.

The invention discloses a Pd-based variable capacitive hydrogen sensor and a preparation method thereof. A SiO2 layer grows on a substrate doped single crystal Si in a heat oxidation manner, a deposition hole is formed in the SiO2 layer in a penetrating manner, movable electrode Pd-based materials are deposited in the deposition hole, a vent groove communicated with the deposition hole is formed in the upper surface of the SiO2 layer, and a stationary electrode conducting panel is bonded on the SiO2 layer. Under the condition existing hydrogen, a Pd-based movable electrode in the sensor absorbs the hydrogen to generate reversible volume expansion, the distance between a movable electrode and a static electrode is shortened, and capacitance is enlarged, so that hydrogen concentration is monitored. The deposition hole of the sensor has a horizontal restraint function, volume expansion of the Pd-based movable electrode is accumulated to the height direction, sensor response is improved, response time of the sensor is effectively shortened, and the sensor is manufactured by the aid of standard Si-based micromachining process, so that the sensor is low in cost and power consumption, can be produced in batches and has a wide market prospect.

The invention discloses a composite surge protection device with double arc extinguishing. The composite surge protection device with the double arc extinguishing comprises a first arc extinguishing protection module and a second arc extinguishing protection module, wherein the first arc extinguishing protection module is a self-blowing arc extinguishing type graphite gap surge protection device, and the second arc extinguishing protection module is formed by connecting a piezoresistor and a discharge tube in series; the second arc extinguishing protection module is located above the first arc extinguishing protection module, and the first arc extinguishing protection module and the second arc extinguishing protection module are connected in parallel to form the composite surge protection device with double arc extinguishing. Through the first arc extinguishing protection module and the second arc extinguishing protection module which are arranged in parallel, arc extinguishing functions are added to the two protection modules, so that the composite surge protection device has high follow current interruption capability and is free of leakage current, the performance of the composite surge protection device is improved, and the service life of the composite surge protection device is prolonged.

The invention provides an electrocardiogram detection device and a detection circuit, and belongs to the technical field of electronics. A housing of the electrocardiogram detection device may be made of a conductive material, and the electrocardiogram detection device may include a voltage holding circuit for providing a target potential to the housing. Due to the fact that the potential difference between the target potential provided by the voltage holding circuit and the reference potential provided by the electrocardiogram detection circuit for a third electrode is small, even if a user touches the housing by mistake in the ECG detection process, and consequently, the housing and the third electrode are conducted, no leakage current is generated between the housing and the third electrode or the generated leakage current is small, so that the interference to the ECG signal can be effectively reduced, and the ECG detection accuracy is ensured.

The invention provides a sensor microphone output protection circuit and a sensor microphone. Wherein the sensor microphone comprises an amplification output circuit, a power supply end and an audio output end, the amplification output circuit is electrically connected with the power supply end and the audio output end, the sensor microphone output protection circuit comprises a voltage detection module, a low-power trigger module and a switch module, and the detection end of the voltage detection module is connected with the power supply end. The output end of the voltage detection module is electrically connected with the controlled end of the low-power trigger module, and the controlled end of the switch module is electrically connected with the low-power trigger module. The invention aims to eliminate the abnormal audio signal output by the sensor microphone when the voltage is not enough or the battery is attenuated and is out of power when the sensor microphone is powered on.

The invention relates to the technical field of traffic power supply equipment, and specifically relates to electric sliding contact tracks of a ground inflatable streetcar, which is characterized by comprising a safety protective box, a hollow sliding track slot body, the electric sliding tracks, pole separating plates, a supply station and an air compression station, wherein the safety protective box is formed by mutually crossing and fixing a base, a left side plate on the left side of the base and a right side plate on the right side of the base, the hollow sliding track slot body is arranged in the safety protective box, inflating holes are horizontally formed in the hollow sliding track slot body, hollow sliding track slots are formed in the side faces or end faces of the hollow sliding track slot body, the adjacent inflating holes are mutually communicated, the air compression station is connected with the inflating holes, three sliding track pole separating grooves are formed in parallel in the hollow sliding track slot body, the pole separating plates are fixed in the sliding track pole separating grooves, the electric sliding tracks are arranged between adjacent pole separating plates, and the electric sliding tracks are connected with the supply station. The electric sliding contact tracks of the ground inflatable streetcar have the advantages of novel structure, safe operation, fast construction progress, no interference signal, no leakage current, low assembly cost and the like.

The invention discloses a novel liquid injection system used for a storage type battery. The novel liquid injection system comprises a battery case, a liquid storage tank, a liquid injection valve, a gas generator and a vent valve, wherein the battery case is internally provided with a battery case cavity, a plurality of battery monomers as well as a common flow passage and a common air passage which are communicated with the gas generator; a cavity liquid injection hole is formed between the battery case cavity and the common flow passage, and battery monomer liquid injection holes are formed between the battery monomers and the common flow passage; the hole diameter of the cavity liquid injection hole is smaller than that of each battery monomer liquid injection hole; a cavity vent hole is formed between the battery case cavity and the common air passage, and vent pipes are arranged between the battery monomers and the common air passage; the liquid storage tank comprises a liquid outlet and an air inlet; the liquid injection valve comprises a liquid injection valve inlet communicated with the liquid outlet and a liquid injection valve outlet communicated with the common flow passage; and the vent valve comprises a vent valve air outlet communicated with the air inlet and a vent valve air inlet communicated with the common air passage. The novel liquid injection system is uniform in liquid injection, the common flow passage is free of electrolyte residue, and no leakage current is generated during battery discharging.

The invention relates to a split type high-pressure cavity structure for comprehensive dielectric property measurement and a measurement method thereof. The split type high-pressure cavity structure comprises an anti-expansion protection steel sleeve, an epoxy glass fiber sleeve, a first connecting hole and a second connecting hole, the epoxy glass fiber sleeve is sleeved with the anti-expansion protection steel sleeve, and the first connecting hole is located above the second connecting hole; and the anti-expansion protection steel sleeve and the epoxy glass fiber sleeve are each of an up-down split structure, and the split interface of the anti-expansion protection steel sleeve and the split interface of the epoxy glass fiber sleeve are both located below the first connecting hole. When a polymer flat plate sample is tested, the polymer flat plate sample is positioned below the split interface of the epoxy glass fiber sleeve; and the epoxy glass fiber sleeve is made of glass fibers. Compared with the prior art, the risk that a polymer flat plate sample is extruded to peripheral gaps under high pressure intensity is prevented, the epoxy glass fiber composite material is adopted as an inner layer sleeve material, and the accuracy of a comprehensive dielectric property measurement result is ensured due to the good insulating property of the epoxy glass fiber composite material.

The invention provides a method for preparing a self-aligned silicide of a metal-oxide-semiconductor (MOS) transistor. In the invention, an ion implantation step is performed before the metal-oxide-semiconductor transistor is subjected to self-aligned silicide treatment, and the implanted Ions (such as: fluorine, chlorine, bromine, iodine, boron and boron difluoride) will first react with the silicon substrate and the surface of the gate, and produce a barrier effect (barrier efreet) in the silicidation process, which can prevent cobalt metal or It is cobalt silicide that infiltrates into the gate or source/drain region to produce a spike phenomenon, which avoids causing junction leakage or reducing the breakdown voltage of the metal oxide semiconductor transistor.

The invention discloses a series-connection combined type surge protector. A pair of arc gaps are formed in an insulating housing; the clearance of the two arc gaps is controlled by the thickness of an insulating gasket, which can be adjusted to determine the protecting voltage of the surge protector; a group of appropriate varistors are further connected in series; the normal current and the ground are isolated by the clearance in a normal state, and the arc extinction is carried out by the varistors in an actuating state; a low-temperature alloy tripping display mechanism is further connected with the varistor combination in series; and when the varistors deteriorate, fail and emit heat to reach a certain temperature, the low-temperature alloy melts, the tripping mechanism actuates, and an alarm is displayed on the housing surface of the surge protector. The surge protector has the advantages that the protection function is strong, the actuating time is short, the after flow is avoided, the arc extinction can be carried out under the condition that the power current is not over zero, the current leakage is avoided, the voltage protection level is low, the service life is long, and the surge protector can protect electrical wires and products against damage caused by direct lightning (10/350 mus) and indirect lightning (8/20 mus) waveform surges at the same time.

The invention discloses a current detection circuit which has few elements, is good in detection effect and comprises a circuit. The circuit comprises a power source, a switch, an MOS (metal oxide semiconductor) transistor and a motor, a microprocessor, a first resistor and a diode are further arranged in the circuit, an electrode D of the MOS transistor is connected with the motor, an electrode S of the MOS transistor is connected with a cathode of the power source, a second resistor is connected between an eighth pin and a seventh pin of the microprocessor, one end of the first resistor is connected with the eighth pin of the microprocessor, the other end of the first resistor is connected with an anode of the power source, an anode of the diode is connected with the seventh pin of the microprocessor, a cathode of the diode is connected with the electrode D of the MOS transistor, and an electrode G of the MOS transistor is connected with a fifth pin of the microprocessor by a third resistor. The current detection circuit has the advantages that the microprocessor can be effectively protected from interference of high voltage and the motor owing to the unilateral conductivity of the diode, the diode is extremely high in back resistance and is nearly free of leak current, and accordingly the performance of the diode can be played to the greatest extent by the current detection circuit.

The invention relates to an arrangement for overload protection for overvoltage protection equipment, consisting of at least one type II overvoltage arrester with or without a thermal disconnecting device that responds in the case of overload. According to the invention, a switching unit free of movable contacts is connected in series with the at least one overvoltage arrester and structurally combined therewith, which switching unit has at least two stationary switching contacts located at a small distance, wherein the distance of the switching contacts is specified in such a way that, in thecase of every surge current event or arresting event, the switching device goes into a quasi closed state because of the arc formed; in contrast, in the idle state the voltage of the connected network drops at the switching device, whereby the overvoltage arrester lying in series remains free of leakage current.