539 results about "Voltage response" patented technology

An electronic device with a force sensing key (200) has a switch (280), a first force sensing region (290) for acquiring a first force value, a second force sensing region (290) for acquiring a second force value, and a processor for determining a selected function for the key (200) based upon the first force value and the second force value when the switch (280) is activated. The first force sensing pad (290) and the second force sensing pad (290) use a partially resistive material (250) that exhibits a force-to-voltage response value. By forming the switch (280) as a dome (225) switch, the force sensing key (200) provides crisp tactile feedback to a user. The force sensing key (200) can be configured for a variety of applications and user preferences by varying the architecture of the actuator (270).

The invention provides a voltage stabilizer which is provided with one or more discharge circuits. The voltage stabilizer compensates less on-chip output capacitance and long loop response time. In an embodiment, the voltage stabilizer comprises an output transistor which is coupled with an output voltage wire, an output voltage sensing device which is coupled with the output voltage wire and is used for generating output feedback voltage and an error amplifier which is coupled with the output feedback voltage, the output transistor and reference voltage and is used for feeding back and controlling the output transistor. A first discharge circuit is coupled with the output voltage wire and a reference potential, wherein, the first discharge circuit is triggered by the status of sharply rising overvoltage. In the other embodiment, a combination of a fast discharge circuit and a slow discharge circuit is used for improving load step response that means preventing too high output voltage jump and drawing the output voltage to the stable value fast, so as to protect a load circuit.

The present invention provides an inexpensive security sensor cable, a method for manufacturing of same and an overall security system for using that sensor cable. The sensor cable consists of a central conductor, an air separator, a polyethylene dielectric tube, an outer conductor and an outer protective jacket. The central conductor is loosely centered in the coaxial cable and thus freely movable relative to the dielectric tube. The sensor cable has application either in a passive sensing system or in an active ranging sensing system to determine the location of an intrusion along the cable. For the passive sensing function, when the center conductor moves, it contacts a suitable dielectric material from the triboelectric series, such as polyethylene, which can be processed to produce a charge transfer by triboelectric effect that is measurable as a terminal voltage. In an active system, the central conductor moves within the dielectric in response to a vibration to provide an impedance change that can be sensed. Conventional radio grade cable may be modified in its construction by removing its dielectric thread to manufacture the sensor cable, thus enabling the center conductor to move freely in the air gap within the dielectric tube. An inexpensive method of manufacturing sensor cable is provided as the cable parts are readily available. Such a sensor cable is advantageous in that the passive triboelectric properties of the cable, in response to a disturbance, can provide a larger voltage response over prior art cables.

Formulations for voltage switchable dielectric materials include two or more different types of semiconductive materials uniformly dispersed within a dielectric matrix material. The semiconductive materials are selected to have different bandgap energies in order to provide the voltage switchable dielectric material with a stepped voltage response. The semiconductive materials can comprise inorganic particles, organic particles, or an organic material that is soluble in, or miscible with, the dielectric matrix material. Formulations optionally can also include electrically conductive materials. At least one of the conductive or semiconductive materials in a formulation can comprise particles characterized by an aspect ratio of at least 3 or greater.

The invention relates to the technical field of manufacturing of lithium ion batteries, in particular to a method for detecting the internal states of the lithium ion batteries and nondestructively screening the lithium ion batteries. The method comprises the following steps that: the lithium ion batteries are put into formation equipment, and the formation charging process of the lithium ion batteries is divided into a constant current charging stage and a constant voltage charging stage; a current signal is given at the constant current charging stage, the acquired voltage response signal continuously rises according to a certain law, the rising velocity of voltage is continuously increased, and the internal states of the batteries are abnormal if the rising velocity of a voltage curve is continuously abnormal in the process; and a voltage signal is given at the constant voltage charging stage, the acquired current response signal curve continuously falls according to a certain law, the falling velocity is gradually reduced, and the internal states of the batteries are abnormal if the falling velocity of the current curve is abnormal in the process. The method has the advantages that on the one hand, screening accuracy is high, and defective products are prevented from entering the next process; and on the other hand, the problems in the previous production process can be timely fed back and guided in being rectified.

A reference voltage generating circuit includes voltage outputting means for outputting a reference voltage corresponding to a difference between a band gap reference voltage and an input voltage; a first resistor having one end that is coupled to the output of the voltage outputting unit; first variable resistor unit having a plurality of second resistors that are serially coupled between the first resistor and a ground voltage, for providing the input voltage of the voltage outputting unit with a first trimming voltage that is inputted to one end of selected one of the plurality of the second resistors in response to decoded signals for trimming the reference voltage; second variable resistor having a plurality of third resistors coupled serially between the first resistor and the ground voltage, the third resistors having different resistances from the second resistors, for providing the input voltage of the voltage outputting unit with a second trimming voltage that is inputted to one end of selected one of the plurality of the third resistors in response to the decoded signals for trimming the reference voltage; and selecting unit for selectively providing the first trimming voltage or the second trimming voltage to the input voltage of the voltage outputting unit.