3690 results about "Circuit protection" patented technology

The invention comprises use of Dynamically Switchable Bypass (DSB) elements in association with one or more Light Emitting Diodes (LEDs) in arrays for illumination circuits to provide rugged, reliable lighting. The DSBs are selected from Transient Voltage Suppressors, including Silicon, Metal Oxide Varistors, and Multi Layer Varistors as well as Zener Diodes. The DSBs are not used as circuit protecting devices, but rather as alternative paths for electric current to bypass failed LEDs. Bi-directional TVSs are used as alternative electric paths for circuits using Alternating Current (AC) and parallel LED arrays that light on both phases of AC. Zener Diodes are used in parallel to, but in the opposite polarity orientation to, one or more LEDs in DC or rectified AC circuits. The inventive paired DSB / LED elements overcomes the black-out problems of prior series LED illumination systems, making possible the use of robust LEDs in illumination systems where reliability, long life, low power consumption, low heat output, resistance to shock, vibration, and humidity, and self-diagnosis are important. The DSB elements have breakdown voltages slightly higher than the LED(s) they support, so that when an LED fails, the conduction through the DSB begins. Because the conduction voltage of the DSB so nearly matches the conduction voltage of the LED(s), the remainder of the circuit continues to function as normal. The system is self-diagnostic in that any LED failure presents itself as a dark LED rather than as a whole string of dark LEDs. DSBs may be used with incandescent bulbs.

The invention discloses an anti-theft system of a power device, comprising a main control unit, an anti-theft alarming module connected with the main control unit, and a sampling system, as well as a remote monitoring terminal; the main control unit carries out communication with the remote monitoring terminal; wherein, the main control unit comprises at least one camera; the anti-theft alarming module realizes anti-theft alarming by an infrared detector or polar plate circuit detecting lines connected in series on each solar polar plate, and generates alarming to the main control unit; the remote monitoring terminal realizes remote monitoring and control. The anti-theft system of the power device has the advantages that: besides the infrared detection function, circuit protection is added as well, thus realizing multi-functional protection effects, not only generating the alarming function on field, but also being capable of shooting the field situations and transmitting to a party in need simultaneously. On the other hand, the system combines anti-theft and power device detection, which not only realizes anti-theft, but also can detect the performances of the power device like detecting the voltage and the current. Moreover, the anti-theft system of the power device can realize undervoltage and undercurrent alarming.

The present invention is directed to an electrical wiring protection device for use in coupling an AC power distribution system to at least one electrical load. The device includes an automated self-test circuit coupled to the AC power distribution system. The automated self-test circuit is configured to generate at least one simulated fault signal during a first predetermined half-cycle of AC power. A detector circuit is coupled to the automated self-test circuit. The detector circuit generates a detection signal in response to the at least one simulated fault signal. An interval timing circuit is coupled to the test circuit. The interval timing circuit is configured to enable the automated self-test circuit to generate the at least one simulated fault signal during a first predetermined interval and not enable the test circuit during a subsequent second predetermined interval. The first predetermined interval and the second predetermined interval are recurring time intervals.

The present invention is directed to a circuit and method for self-testing a protection device for use in an AC power distribution system. The device is configured to be coupled between an AC power distribution system and at least one load. The method includes the step of introducing a simulated ground neutral fault during a first predetermined half cycle half cycle of the AC power. An attempt is made to detect the introduced simulated grounded neutral fault during the first predetermined half cycle half cycle. A fault condition is signaled if the introduced simulated grounded neutral fault is not detected within a predetermined period of time.

A protection circuit is provided for protecting a secondary battery from overcharging and excessive discharge current by a simple circuit. The protection circuit is provided with a connection terminal (T3) for connecting the secondary battery (6); a connection terminal (T1) for connecting a charging device for charging the secondary battery (6) and / or a load device driven by a discharge current from the secondary battery (6); a bimetal switch (SW1) that is provided between the connection terminals (T1, T3) and turned off in the case of exceeding a specified temperature set beforehand; a heater (R2) for heating the bimetal switch (SW1); and an integrated circuit (IC1) for turning the bimetal switch (SW1) off by causing the heater (R2) to generate heat if a voltage applied to the connection terminal (T3) by the secondary battery (6) exceeds a preset reference voltage.

A circuit protection device connected between two lines of an AC power source self checks for an introduced simulated ground fault every half cycle during a period when a trip SCR cannot conduct. If the self check fails, the device is tripped on the next half cycle of different phase. Possible responses to the self check failure include lighting an indicator lamp and locking out the device reset mechanism.

The functionality of electronic convertors for low voltage filament lamp applications, such as halogen lamps, can be increased by including auxiliary circuits. Such auxiliary circuits may include gate drive resistors; a charge pump for sustaining the DC supply; open circuit protection; short circuit protection; thermal protection; extended resetting time; latched shutdown; self-dimming; a digital (DALI) interface; and line voltage compensation.

A precision voltage control circuit applicable to a PWM (Pulse Width Modulation) circuit can offer CCFL (Cold Cathode Fluorescent Lamp) or EEFL (External Electrode Fluorescent Lamp) tubes a stable high frequency voltage or current, so that each CCFL or EEFL tube can get an appropriate compensation current and an optimal emitting efficiency and enhance its emitting quality. The circuit also has an overload current, low current, and overload voltage and low voltage protective circuit to protect the CCFL or EEFL tubes from being injured. The circuit can also be applied to the TFT LCD TV or other large LCD panels, and develops the best display effect of each LCD tube.

Circuit structure and resulting circuitry for multiple-valued logic. The circuit structure allows the design and fabrication of any r-valued logic function of n-places where r is an integer greater than 1 and n is an integer greater than 0. This structure is called SUpplementary Symmetrical LOgic Circuit structure (SUS-LOC). In circuits incorporating SUS-LOC, circuit branches are realized that uniquely deliver circuit response and output. For some circuits, and due to the operating characteristics of the switch elements, additional circuit elements, or stages, must be incorporated to prevent "back biasing." SUS-LOC is fully active. Only active elements perform logic synthesis and those components not directly related to logic synthesis, such as resistors and / or other passive loads, are relegated the task of circuit protection. The fabrication of r-valued, multi-valued, or multiple-valued logic circuits, designed using the definitions of the SUS-LOC structure can be accomplished with known techniques, materials, and equipment.

Systems and methods for providing overcurrent circuit protection are disclosed. A method of providing overcurrent circuit protection may include setting a threshold current value according to an operational state of a motor and sensing an amount of current being supplied to the motor. The method may further include electrically isolating the motor from a current source if the sensed current amount is greater than the threshold current value.

The present invention provides overvoltage circuit protection. Specifically, the present invention provides a voltage variable material (“VVM”) that includes an insulative binder that is formulated to intrinsically adhere to conductive and nonconductive surfaces. The binder and thus the VVM is self-curable and may be applied to an application in the form of an ink, which dries in a final form for use. The binder eliminates the need to place the VVM in a separate device or for separate printed circuit board pads on which to electrically connect the VVM. The binder and thus the VVM can be directly applied to many different types of substrates, such as a rigid (FR-4) laminate, a polyimide or a polymer. The VVM can also be directly applied to different types of substrates that are placed inside a device.

A light emitting device having a circuit protection unit is provided. The circuit protection unit has a low-resistance layer and a potential barrier layer, wherein a barrier potential exists at the interface between the low-resistance layer and the potential barrier layer. The circuit protection unit is electrically connected with the light emitting device. When an electrostatic discharge or excessive forward current is occurred in the light emitting device, the circuit protection unit provides a rectifying function for preventing damages caused by static electricity or excessive forward current to the light emitting device.

A boost converter includes a load disconnect switch connected between a voltage input terminal and an inductor, a power switch connected to the inductor by a switching node, a diode connected between the switching node and a voltage output terminal, and an output capacitor connected to the voltage output terminal to provide an output voltage. A protection apparatus is connected to the load disconnect switch, switching node and power switch to monitor the voltage at the switching node and the output voltage to provide open circuit and short circuit protection for the boost converter.

The invention discloses an induction cooker heating device. A main control chip module (10) connected with a heating control circuit is arranged in a cooker body (1), and the cooker body is provided with a circuit coupling interface A (3) of the heating control circuit. A sensor module (40) is arranged in a pot body (2), and a circuit coupling interface B (3) electrically connected with the sensormodule is arranged in the bottom of the pot body. When the bottom seat of the pot body is on the top of the cooker body, the circuit coupling interface B is jointed with the circuit coupling interface A, so that the main control chip module can be electrically connected with the sensor module so as to control heating. An induction cooker of the induction cooker heating device can be used alone orconduct combined use, the functions are complete, and the individual placement space of the induction cooker is saved. The assembly structure is consistent with user usages. During assembly, whetherthe pot body is assembled in place or not can be detected and short-circuit protection can be realized through a pot assembly detection module and a switching circuit module. Thus, the damage of a main control chip is prevented, and the equipment safety and reliability is high.

A MEMS (microelectromechanical system) electrical switch device is provided for circuit protection applications. The device includes a mechanical latching mechanism by which the switch is held in the closed position, and a mechanism by which this latch is released when the load current passing through the device reaches or exceeds some desired magnitude. In addition, a mechanism is provided by which the switch may be reset to its closed position by applying an electrical control voltage to certain terminals of the device. A number of these devices, or arrays of these devices, can be fabricated by parallel processes on a single substrate, and photolithography can be employed to define the mechanical structures described above. Other embodiments include additional electrical isolation of the resetting mechanism, enhancement of the separation distance of the contact points of the switch in the open position, and prevention of arcing at the latch mechanism. A method of fabricating the device is provided. A method of using the aforementioned device is also provided.

NMR transmitter / receiver antenna active signal conditioning circuitry that enables receiver antenna circuit protection from high voltage RF transmitter pulses, provides energy dumping for the entire antenna in successive stages and eliminates re-tuning during sweeping of the antenna frequency.

An electrical wiring device includes a housing, and a circuit protection component and a light source operably mounted within the housing. In various aspects, the circuit protection component is a ground fault circuit interrupter (GFCI) or an arc fault circuit interrupter (AFCI). The light source can function to provide increased illumination in an environment surrounding the electrical wiring device (e.g., a darkened bathroom or a darkened kitchen), or to indicate the status of the circuit protection component (e.g., tripped or normal). The light source may be one or more LEDs, neon sources, incandescent sources, etc. Embodiments of the invention include, in addition, a sensor for controlling the on / off state of the light source and / or a trip indicator separate from the light Source for indicating a status condition of the circuit protection component. The device is illustratively represented by a grounded plug receptacle, but may be embodied in a switch, a dimmer, or other application device.

The present invention is directed to an electrical wiring protection device for use in coupling an AC power distribution system to at least one electrical load. The device includes an automated self-test circuit coupled to the AC power distribution system. The automated self-test circuit is configured to generate at least one simulated fault signal during a first predetermined half-cycle of AC power. A detector circuit is coupled to the automated self-test circuit. The detector circuit generates a detection signal in response to the at least one simulated fault signal. An interval timing circuit is coupled to the test circuit. The interval timing circuit is configured to enable the automated self-test circuit to generate the at least one simulated fault signal during a first predetermined interval and not enable the test circuit during a subsequent second predetermined interval. The first predetermined interval and the second predetermined interval are recurring time intervals.

A portable, temporary power distribution system is contained in a fully integrated, reusable container, and is particularly useful in temporary applications, especially as an alternative power distribution system. The portable system provides comprehensive functionality for all aspects of a power system, and any adjuncts thereto. The portable power distribution system is fully integrated, and can include, for example, low voltage capability, emergency lighting control, communication, power allocation control and circuit protection, as well as any other protective or control feature that is used in a permanent power distribution system for virtually any installation.

The invention relates to a multipole fused switch arrangement for busbar systems having at least two fused switch units (10) which each holds a fuse link (20), with the fused switch units (10) having a mounting and contact apparatus (11) for a busbar, and having a switching apparatus for closing and interrupting the circuit of all the switched fuse units, with the fused switch arrangement comprising a combined switching and blocking apparatus (30), having a switching lever (40), an operating arrangement (60), a blocking apparatus (70) for each fused switch unit (10), and a locking apparatus (80).

A compact and multi-functional power monitoring and circuit protection system is provided that is easily installed, used and modified, and internally derives all control and output power from the input voltages being monitored for abnormal power conditions. The functionality of all desired power monitoring and sensing devices is integrated into one unit controlled by a microprocessor. This substantially reduces the number of parts and control wiring required to achieve adequate power monitoring and circuit protection, and reduces the assembly and installation time. The integrated system uses only one set of voltage input wires, one set of current input wires, one set of blown fuse input wires and one output pair of wires to the power disconnect switch's shunt trip. Circuitry is provided to select one of the three power phases being monitored such that one of the three phases is always available to power the system. Control voltages for controlling the shunt trip and external circuits using output relays (to illuminate pilot lights, bell alarms, etc.) are also provided onboard the unit. A blown fuse detection circuit uses solid-state devices in lieu of replaceable trigger fuses. The unit can be instantly reset itself after a blown fuse condition in a power disconnect switch has been rectified.

The invention relates to the technical fields of photoelectricity and chemical industry, in particular to a low-stress epoxy / organic silicon / POSS nano hybrid material, and a preparation method and application thereof. The epoxy / organic silicon / POSS nano hybrid material comprises (a) an epoxy resin, (b) a polyorganosiloxane, (c) a cage-type polysilsesquioxane (POSS), (d) an epoxy hardener, (e) non-essential silane oxycompound and (f) non-essential assistants, wherein the polyorganosiloxane contains epoxy groups and silane oxygen groups. The cured nano hybrid system has excellent reticular cross-linked structure and does not have microphase separation. The epoxy / organic silicon / POSS nano hybrid material has the advantages of high mechanical strength, favorable heat resistance, favorable cohesive property, high chemical stability, favorable ultraviolet aging resistance, favorable optical transparency and other excellent properties, has the functions of low internal stress and pressure buffer, and can be used as an LED packaging material, optical protection material, circuit protection coating material, adhesive paint and the like.

A fuse box system and method providing for visual and / or remote sensing of interrupted fusing elements is disclosed. The system incorporates LEDs and / or remote sensing apparatus to permit indication of a “blown” fuse and / or circuit protection breaker. This system may be configured for both polarized and / or non-polarized applications and generally provides for indicator illumination when a fuse / breaker is blown. Some preferred embodiments may incorporate current sourcing technologies to permit operation of the system over wide range of system voltages, as well as provisions for wired and / or RF / wireless interrogation of the fuse / breaker status. Alternate embodiments including systems / methods to permit remote sensing of fuse status and / or circuit current monitoring, and may be retrofit within existing fuse / breaker panel systems in some configurations.

An electronic device formed as an integrated circuit (IC) wherein the electronic device further includes a transient voltage suppressing (TVS) circuit. The TVS circuit includes a triggering MOS transistor connected between an emitter and a collector of a first bipolar-junction transistor (BJT) coupled to a second BJT to form a SCR functioning as a main clamp circuit of the TVS circuit. The TVS circuit further includes a triggering circuit for generating a triggering signal for the triggering MOS transistor wherein the triggering circuit includes multiple stacked MOS transistors for turning into a conductive state by a transient voltage while maintaining a low leakage current.

A power distribution panel with a chassis defining an interior with a first opening and a second opposing opening. The panel including a module with a bottom, a first face and a second face, and including a power input terminal, a plurality of power output terminals, and an electrical circuit connecting each power output terminal to the power input terminal, each circuit including a circuit protection device. The power input terminal, the power output terminals and the circuit protection devices are mounted to one of the first or second faces. The module is configured to be received through the first opening and removably mounted within the interior so that the power input terminal, the power output terminals and the circuit protection devices are accessible through one of the first and second openings when the module is mounted within the chassis. A module including power distribution components and circuitry adapted to be removably mounted within a power distribution panel chassis.

An electronic circuit device comprising at least one substrate having a photoimageable covercoat, comprising at least 95 weight percent of at least one epoxy-modified aromatic vinyl-conjugated diene block copolymer and a catalyst comprising an onium salt selected from a triarylsulfonium salt and a diaryliodonium salt, wherein the covercoat is formed by solvent coating or extrusion and then heat laminated onto at least a portion of the substrate.

An MRI-compatible electronic medical therapy system includes an active medical device connected to a plurality of electrodes. A multiplexer circuit includes at least one circuit protection device in electrical series with the electrodes and the medical device. The circuit protection device can be in the form of a switch or a band stop filter. The circuit protection device is adapted to permit current flow therethrough during normal medical device related therapy, but substantially prevent current flow therethrough in the presence of an induced electromagnetic field.

A protection circuit is provided for protecting a secondary battery from overcharging and excessive discharge current by a simple circuit. The protection circuit is provided with a connection terminal (T3) for connecting the secondary battery (6); a connection terminal (T1) for connecting a charging device for charging the secondary battery (6) and / or a load device driven by a discharge current from the secondary battery (6); a bimetal switch (SW1) that is provided between the connection terminals (T1, T3) and turned off in the case of exceeding a specified temperature set beforehand; a heater (R2) for heating the bimetal switch (SW1); and an integrated circuit (IC1) for turning the bimetal switch (SW1) off by causing the heater (R2) to generate heat if a voltage applied to the connection terminal (T3) by the secondary battery (6) exceeds a preset reference voltage.

An ESD protective circuit protects an input or output of a monolithically integrated circuit. The ESD protective circuit has at least one bipolar transistor structure and one ESD protective element between two supply networks. The emitter of the bipolar transistor structure is electrically connected to the input or output, while the base is electrically connected to one of the two supply networks. The collector produces a current signal, which is used for triggering of the ESD protective element, when an ESD load occurs at the input or output.