117 results about "Pull in voltage" patented technology

Nano-electromechanical device having an electrically conductive nano-cantilever wherein the nano-cantilever has a free end that is movable relative to an electrically conductive substrate such as an electrode of a circuit. The circuit includes a power source connected to the electrode and to the nano-cantilever for providing a pull-in or pull-out voltage therebetween to effect bending movement of the nano-cantilever relative to the electrode. Feedback control is provided for varying the voltage between the electrode and the nano-cantilever in response to the position of the cantilever relative to the electrode. The device provides two stable positions of the nano-cantilever and a hysteresis loop in the current-voltage space between the pull-in voltage and the pull-out voltage. A first stable position of the nano-cantilever is provided at sub-nanometer gap between the free end of the nano-cantilever and the electrode with a pull-in voltage applied and with a stable tunneling electrical current present in the circuit. A second stable position of the nano-cantilever is provided with a pull-out voltage between the cantilever and the electrode with little or no tunneling electrical current present in the circuit. The nano-electromechanical device can be used in a scanning probe microscope, ultrasonic wave detection sensor, NEMS switch, random access memory element, gap sensor, logic device, and a bio-sensor when the nano-cantilever is functionalized with biomolecules that interact with species present in the ambient environment be them in air or aqueous solutions. In the latest case, the NEMS needs to be integrated with a microfluidic system.

A microphone and a method for calibrating a microphone are disclosed. In one embodiment the method for calibrating a microphone comprises operating a MEMS device based on a first AC bias voltage, measuring a pull-in voltage, calculating a second AC bias voltage or a DC bias voltage, and operating the MEMS device based the second AC bias voltage or the DC bias voltage.

A small thin film movable element comprises; a movable portion supported elastically deformably and having a movable electrode at at least a portion of the movable portion; and a fixed electrode arranged to be opposed to the movable portion, wherein the movable portion is displaced by an electrostatic force in accordance with a voltage applied to the movable electrode and the fixed electrode, and wherein the voltage applied in displacing the movable portion falls in a range equal to or lower than a static pull-in voltage for bringing the movable portion into contact with a side of the fixed electrode against a resistance force generated in accordance with an amount of displacing the movable portion and equal to or higher than a minimum dynamic pull-in voltage for bringing the movable portion into contact with the side of the fixed electrode by being compounded with an inertia force generated in accordance with an operation of the movable portion.

Driving is made possible in a moving range equivalent to or wider than the conventional range, with a driving voltage having a range smaller than a pull-in voltage. An electronic element includes a fixed portion, and a movable portion which is movable with respect to the fixed portion and which is provided to generate a spring force to make restoration to a predetermined position. The fixed portion is provided with a first driving electrode and a first signal electrode. The movable portion is provided with a second driving electrode and a second signal electrode. An electrostatic force is generated between the first driving electrode and the second driving electrode by a voltage applied therebetween so that the electrostatic force resists against the spring force; and the first and second driving electrodes and the first and second signal electrodes are arranged so that the electrostatic force is generated in a direction in which a spacing distance between the first and second signal electrodes is widened.

The invention discloses an automatic testing system for the vibration fatigue characteristic of a on-line micro electromechanical system beam which consists of a voltage generating module, an amplifier, a beam, a timer, a voltage detecting module, a protection circuit and a data output module. The invention adopts the technical scheme as follows: firstly using an AC voltage to load a vibration fatigue load on the micro electromechanical system beam to lead the beam to vibrate for specific times; removing the vibration fatigue load, then loading a DC measuring voltage on the beam to detect a pull-in voltage value which reflects the fatigue characteristic of the beam, finally repeating the steps to lead the loading and the measuring to be alternatively carried out to obtain a relation between the pull-in voltage value which reflects the fatigue characteristic of the beam and the vibration times of the beam. The automatic testing system integrates the loading of the vibration fatigue load and the testing of the fatigue characteristic, thereby leading the system to be simpler; besides, the measuring process is completely automatic and no persons are needed to watch the whole process.

The invention relates to a drive assembly of a pulsator washing machine. The drive assembly comprises a mounting tray. A spindle and a shaft sleeve sleeved on the spindle are rotatably disposed on the mounting tray. A reduction electromagnetic clutch mechanism is disposed between the spindle and the shaft sleeve. A drive mechanism is disposed on the lower portion of the spindle. The reduction electromagnetic clutch mechanism is an electromagnetic clutch mechanism having a function of electromagnetic clutch planetary gear reduction. The reduction electromagnetic clutch mechanism is provided with a planetary gear component and an electromagnetic clutch component. The drive mechanism is an external rotor direct-drive motor comprising a rotor and a stator. The stator is fixedly connected to the mounting tray. The rotor is fixedly connected with the spindle. The spindle and the electromagnetic clutch and planetary gear reduction mechanism are directly driven by an external rotor motor, and accordingly defects such as complex ratchet and pawl structure, large size and low control accuracy in the prior art are broken through. Electromagnetic clutching is high in transmission efficiency, accurate in transmission and clutching control and low in noise; the whole drive assembly is light in weight, pull-in voltage and holding voltage are less demanded in electromagnetic clutching, and energy consumption is reduced effectively.

The invention discloses an ACS710 based frequency converter overcurrent protection circuit and method. The circuit comprises a frequency converter, a fault pull-up resistor, an enabling pull-up resistor, a first comparator, a second comparator, an eleventh resistor, a fourth resistor, a triode, a voltage stabilizing tube and a hardware lockout sub-circuit, wherein the first comparator is used for comparing pull-down voltage of a chip overcurrent fault pin with a reference voltage value, the second comparator is used for level overturn protection on overcurrent. The hardware overcurrent protection circuit is designed according to overcurrent signals of the overcurrent fault pin of an ACS710 Hall, so that a primary short-circuit priority protection circuit is added by output of the frequency converter, circuit protection signals are directly transmitted to the hardware lockout sub-circuit without being processed via a CPU (central processing unit) so as to shield drive PWM (pulse-width modulation) signals, delay of the circuit only includes ACS710 fault detection delay and overturn delay of the second comparator, delayed response time of the whole circuit is within 5us, and the shortcoming that a traditional circuit is not timely in short-circuit protection is eliminated thoroughly .

The invention discloses a microphone and electronic equipment. The microphone comprises a shell with a cavity and a microphone unit arranged in the shell cavity, and further comprises an acousticallysealed electret film and a pole plate; the electret film is configured to seal a channel between a sound hole and the microphone unit when the electret film and the pole plate are adsorbed together; relative to a surface level Vs on the pole plate, the electret film satisfies the condition that Vs is more than VPI water and less than VPI air, wherein the VPI water represents the pull-in voltage ofthe electret film and the pole plate in the water, and the VPI air represents the pull-in voltage of the electret film and the pole plate in the air. The microphone disclosed by the invention can beautomatically waterproof, and can resist large water pressure.

The invention provides a micro-electro-mechanical-system microphone. The microphone comprises a back plate and a diaphragm which is opposite to the back plate, wherein the back plate is provided with a main body part; the diaphragm is provided with a vibration part; an insulating layer which completely covers the main body part or the vibration part is arranged between the diaphragm and the back plate; when the insulating layer completely covers the main body part, a gap is formed between the insulating layer and the vibration part; and when the insulating layer completely covers the vibration part, a gap is formed between the insulating layer and the main body part. The micro-electro-mechanical-system microphone can effectively prevent the diaphragm from pulling in the back plate at pull-in voltage during work.

The invention discloses an anti-interference electricity contactor time delay device. The time delay device comprises an alternating current auxiliary power supply input module, an auxiliary power supply state detection module, a switch power supply module, a switch power supply state detection module, a pull-in voltage circuit module, a holding voltage circuit module, a selection control switch module, a button, a display, an alarm, an output module, a contactor coil, a contactor coil operation state detection module and a master control unit module. Setting of delay time of 0.1s to 9.9s, adjusting of a holding voltage of 2.0V to 12V and setting of a power loss voltage and a recovery voltage can be achieved through setting of different parameters, the time delay device has a display, an alarm output and a motion output outlet, therefore functions of an anti-interference electricity contactor time delay module, such as high reliability, flexible selection application, low cost, energy saving and simple control line are achieved, and the purpose of delay time release of contactor functions during interference electricity of the system is achieved.

The present invention relates to a method for a driving solenoid-operated fuel injector in diesel. An accurate control of a solenoid-operated fuel injector in a Diesel or gasoline engine requires that a pull-in voltage (V pull-in ) higher than the generally available battery voltage (V batt ) is applied to the injector (2,3), and that the injection is ended as quickly as possible, in order that the fuel injection closely follows the solenoid current profile. When the initial pull-in voltage is lower than the expected nominal value, a deviation of the injected fuel quantity appears with respect to the nominal quantity. This inconvenience is overcome by monitoring the actual value of a selected parameter, such as the actual value of the initial pull-in voltage (V pull-in), and the injectionstart time (t e ) and the solenoid energizing time (ET) are correspondingly modified ( t, ET).

The invention discloses a method for measuring the mechanical parameters of a double-layer double-clamped beam, which belongs to the technical field of micro-electro-mechanical system (MEMS) material parameter online test. According to the method, based on a pull-in voltage analysis model of upper and lower unequal-width double-layer double-clamped beams, numerical calculation is carried out by using pull-in voltage of a group of upper and lower unequal-width double-layer double-clamped beams, equivalent Young's modulus of each layer and equivalent residual stress data of each layer can be obtained more accurately at one time, which is of great significance for the production and research of MEMS. The invention also discloses a mechanical parameter measuring device for double-layer double-clamped beam.

The invention discloses an electromagnetic type power master switch for a car. According to the key points of the technical scheme, the electromagnetic type power master switch for the car comprises an electromagnetic component, a metal shell, a movable iron core, a movable contact component and a fixed electrode. The electromagnetic component is mainly composed of a magnetism conducting plate, a coil holder, a primary coil and an auxiliary coil, wherein the primary coil and the auxiliary coil are arranged on the coil holder, the auxiliary coil is arranged at the outer side of the primary coil, a thermistor is connected to a closed circuit of the auxiliary coil in series, and the thermistor is fixed inside a groove of bakelite through 906 insulation paste. The primary coil and the auxiliary coil are provided, the thermistor is connected to the closed circuit of the auxiliary coil in series, and therefore the electromagnetic type power master switch for the car achieves the effects of reducing energy consumption, lowering pull-in voltage, lowering a heat value and reducing material consumption.

The invention discloses a vehicle relay energy saving control circuit having voltage protection. The vehicle relay energy saving control circuit having voltage protection includes a voltage protectioncircuit, an energy saving control circuit and a vehicle relay driving circuit. A relay coil voltage is stabilized on the condition that external wide voltage range input power conditions are met; according to characteristics of a relay, the minimum pull-in voltage and the minimum holding voltage are provided at a pull-in phase and a holding phase respectively, the coil consumption power is stabilized, through feedback closed-loop control, in the case of external voltage changes, the coil is guaranteed to consume the minimum power. The vehicle relay energy saving control circuit is advantagedin that the voltage protection circuit is set, the coil is guaranteed to operate in the normal operation voltage range, under high and low voltage conditions, the relay coil is effectively protected from being influenced or damaged.

The invention relates to a full-automatic detection processing line, and belongs to the production field of electromagnetic switches of start motors. The full-automatic detection processing line comprises a middle control mechanism, as well as a transmission mechanism, an airtightness test box, a hook size test box, a switch cover direction confirmation mechanism, an additional stroke test box, a pull-in voltage test box, a release voltage test box, a coil current balance test box, a running-in test box, a measuring contact step-down and withstand voltage test box and an automatic ink jet box driven by the middle control mechanism; and the transmission mechanism comprises a cyclic feeding belt and a tool positioning platform arranged on the cyclic feeding belt. In the full-automatic detection processing line, the test boxes are arranged sequentially along the cyclic feeding belt, and during detection, the tool positioning platform is pushed manually and conveyed along the cyclic feeding belt, and undergoes different data detection successively; and via a processing line detection manner, the detection efficiency is improved greatly, the outgoing amount of an enterprise is increased, and the enterprise cost is reduced.

The invention discloses a Monte Carlo simulation based method for predicting the pass percent of pull-in voltages of contactors and belongs to the technical field of contactor detection. The method solves the problems that methods for detecting pull-in voltage parameters during design of existing contactors are high in design and test cost and long in design period due to the fact that samples are required to be machined and manufactured. According to the method, three kinds of design values, upper limits and lower limits of parameters which affect pull-in voltages are determined according to design documents of contactors, and a matrix laboratory (MATLAB) is used for producing N groups of parameter combinations through an independent identically distributed central limit theorem; then N groups of pull-in voltage characteristic parameters are obtained according to N groups of parameter combinations; distribution characteristics of pull-in voltage parameters are obtained; and finally, the pass percent of pull-in voltages of contactors is obtained through a Simpson principle according to distribution characteristics and pull-in voltage design parameters. The method is applicable to prediction and analysis of the pass percent of pull-in voltages of contactors in the design link of contactors, so that bases are provided for correction of design parameters for designers of contactors.

The invention discloses an elevator emergency rescue method and device. The method comprises the following steps that after an elevator is powered off, a rescue device is started, the rescue device detects the voltage of the rescue device after being started, when the detection value is not lower than the lowest pull-in voltage of an elevator brake, the rescue device detects the load in the elevator, when the elevator is loaded, the rescue device detects the position, in a shaft, of the elevator, when the elevator is located in the non-level position, the rescue device provides power for the elevator brake; and the elevator brake drives the elevator to the level position; after the rescue device stops providing power for the elevator brake and supplies power to a portal crane so that the landing door can be opened, and trapped persons leave the elevator through the landing door; and after the trapped persons leave completely, the rescue device stops the elevator. The elevator emergencyrescue method and device have the characteristics that the intelligent degree is high, and the safety is good.

The invention discloses a vacuum contactor comprehensive performance test board which is characterized by comprising an input/output loop unit, a signal detection unit, an analytical control unit and a voltage-regulating unit. The input/output loop unit is used for inputting power and supplying the same for each unit; the signal detection unit is used for detecting output voltage and coil current of a contactor and sending the output voltage and the coil current to the analytical control unit to be analyzed and judged; the analytical control unit is used for analyzing and judging multiple dynamic tests of the contactor; and the voltage-regulating unit is used for controlling clockwise/anticlockwise rotation of a motor through signals analyzed by the analytical control unit, so that a voltage regulator can be boosted and released to release voltage when the contactor pulls in voltage. With the method, test results of the multiple dynamic detects of the contactor are accurate and visual, testing time is short, and conventional connection troubles during tests are reduced; one equipment with the contactor is provided with the tests and analyses of multiple performance parameters at a time; and intellectualization of incoming goods detection is improved, and professional requirements on an detection personnel is lowered.