105 results about "Resettable fuse" patented technology

A battery charger protection circuit (10) interposable between a charger system or charger battery (22) and a lead acid or gel cell charging battery (26) to allow 1-to-1 charging thereof while protecting against short circuit and reverse current conditions. The circuit (10) broadly comprises a printed circuit board (12); a self-resettable fuse (14); a Schottky barrier diode 16; and connection wires (18). The self-resettable fuse (14) includes a temperature-sensitive polymer fuse material operable at a predetermined maximum current, defined by the polymer fuse material's composition, to increase in electrical resistance and thereby reduce current flow.

A resettable fuse device is fabricated on one surface of a semiconductor substrate (10) and includes: a gate region (20) having first and second ends; a source node (81) formed in proximity to the first end of the gate region; an extension region (52) formed to connect the source node to the first end of the gate region; and a drain node (80) formed in proximity to the second end of the gate region and separated from the gate region by a distance (D) such that upon application of a predetermined bias voltage to the drain node a connection between the drain node and the second end of the gate region is completed by junction depletion. A gate dielectric (30) and a gate electrode (40) are formed over the gate region. Current flows between the source node and the drain node when the predetermined bias is applied to both the drain node and the gate electrode.

An irrigation controller comprising a housing, a control circuit having a processor and a memory, the control circuit configured to store and execute an irrigation schedule, an input connector configured to be coupled to an alternating current (AC) power supply and receive an AC power signal having a first voltage level, a transformer disposed at least partially in the housing, the transformer having a primary side and a secondary side, wherein the primary side is coupled to the input connector, a resettable fuse disposed at least partially in the housing, the fuse being electrically coupled in series between the input connector and the primary side of the transformer, driver circuitry disposed in the housing and electrically coupled to the secondary side of the transformer, and wherein the driver circuitry is coupled to the control circuit, and an output connector coupled to the driver circuitry.

The present invention discloses an overvoltage and overcurrent protecting circuit connected between a power source and a load, which includes: a resettable fuse, a first end of which is electrically connected to an output end of the power source; a switch circuit, a first conduction end of which is electrically connected to a second end of the resettable fuse, and a second conduction end of which is electrically connected to the load; an overvoltage circuit, for detecting whether an output voltage of the power source is overvoltage; an overcurrent detecting circuit, for detecting whether a current flowing through the resettable fuse is overcurrent; and a switch control circuit, a first input end of which is electrically connected to an output end of the overvoltage detecting circuit, and a second input end is electrically connected to an output end of the overcurrent detecting circuit, to control the electrical connection between the output end and the control end of the switch circuit, so as to control disconnection of the switch circuit when the overvoltage and/or overcurrent is detected, and automatically control the conduction of the switch circuit after a preset time period for disconnection is reached. The circuit of the present invention can protect the overvoltage and overcurrent at the same time, and can recover normal operations of the load after the fault state is vanished.

The invention relates to a novel two-way blocking-up type surge protection device which is composed of dependent mode field effect transistors and resistors; the source electrodes of the first dependent mode field effect transistor and the second dependent mode field effect transistor are respectively connected with the source electrode and the drain electrode of the third dependent mode field effect transistor in series; the drain electrode of the first dependent mode field effect transistor is connected with the input end of a module, the grid electrode of the first dependent mode field effect transistor is connected with the source electrode of the second dependent mode field effect transistor; the drain electrode of the second dependent mode field effect transistor is connected with the input end of the module, the grid electrode of the second dependent mode field effect transistor is connected with the source electrode of the first dependent mode field effect transistor; the grid electrode of the third dependent mode field effect transistor is connected with the first resistor and the second resistor; the other end of the first resistor is connected with the input end of the module, and the other end of the second resistor is connected with the output end of the module. The invention forms a similar variable resistor circuit with resettable fuse wires, which can repeat blocking reset limitlessly; the two-way blocking-up type surge protection device also can realize blocking-up of surge forwards and backwards, thus improving performance of blocking-up type surge protection device.

A temperature compensated device to prevent overcurrent in electrical circuits in very cold conditions. The device includes a PTC thermistor to control current through a circuit. A negative temperature coefficient (NTC) thermistor is thermally coupled to a PTC thermistor to ‘warm’ the PTC thermistor in cold environments. When circuit current flows in the NTC thermistor, the NTC thermistor will heat up, thus warming the PTC thermistor. The PTC thermistor may then operate as designed and prevent overcurrent in an electrical circuit.

A resettable switch has a light emitting diode in parallel connection therewith such that when the resettable switch is in a tripped condition, the resulting voltage drop across the LED causes a sufficient flow of current therein to illuminate the LED. A diode and resistor are placed in serial connection with said LED in order to protect the LED from excessive voltage and current.

The invention relates to a voltage transformer harmonic elimination protector, in particular to a three-phase power supply network electromagnetic voltage transformer harmonic elimination protector, which comprises a capacitor. The capacitor is connected in parallel with a resettable fuse to form the harmonic elimination protector; and the harmonic elimination protector is connected in series between a neutral point and a ground point of a primary side of a three-phase electromagnetic voltage transformer to prevent ferromagnetic resonance overvoltage. The three-phase power supply network electromagnetic voltage transformer harmonic elimination protector can effectively eliminate ferromagnetic resonance caused by using the electromagnetic voltage transformer in a power supply system so as to prevent the generated overvoltage from damaging multiple kinds of equipment in the system, cannot influence normal operation of other protectors in the power supply system, has the advantages of simple structure, convenient use and low manufacturing cost and use cost, and can be widely applied to the power supply system of the 3 to 35kV three-phase power supply network electromagnetic voltage transformer.

Battery charging assemblies for children's ride-on vehicles, and children's ride-on vehicles that include the same. The charging assemblies may include a power adapter that is adapted to be electrically connected to a power source, a charger cord, and a charging connector that is adapted to electrically interconnect with the rechargeable battery of the ride-on vehicle. The battery charging assemblies further include at least one protective element to prevent or significantly reduce backflow current from the battery into the battery charging assembly. The protective element may be located in the charging probe or at any point along the charger cord of the battery charging assembly. The protective element may include any suitable current-limiting or current-interrupting device. Examples of such current limiting devices include, without limitation, a fuse, a circuit breaker, an anti-backflow diode, and a resettable fuse such as a positive temperature coefficient resistor (PTC resistor).

The invention discloses a low on-resistance blocking type surge protection device. A drain of a first transistor is connected with a module input end, and a grid of the first transistor is connected with a source of a second transistor; a drain of the second transistor is connected with a module output end, and a grid of the second transistor is connected with a source of the first transistor; a first variable resistor element is connected with a source of a first dependent mode field effect transistor and a source of a third transistor; a second variable resistor element is connected with the source of the second transistor and a drain of a third dependent mode field effect transistor; a grid of a third transistor is connected with a first resistor and a second resistor respectively; and the other end of the first resistor is connected with the module input end, and the other end of the second resistor is connected with the module output end. The low on-resistance blocking type surge protection device provided by the invention forms a variable resistance circuit similar to a resettable fuse, which can block and reset repeatedly for unlimited times; besides, the low on-resistance blocking type surge protection device can also realize blocking protection under low on-resistance and low trigger current, and improve the performance of the blocking type surge protection device.

The invention relates to a transmission system and resettable fuse production equipment. A vibrating disc, a transmission mechanism and a transmission pipe are arranged. In the actual transmission system application process, the vibrating disc vibrates a resettable fuse to the output end in a circulated manner, the resettable fuse then falls into a material containing zone along with vibration, atthe time, a sliding belt driving device drives a transmission sliding belt to slide relative to an installing support, the resettable fuse is further driven to move in the direction getting close tothe transmission pipe to be transmitted into the transmission pipe, automatic transmission of the resettable fuse can be achieved, compared with manual transmission, the transmission efficiency is greatly improved, and the transmission speed is high.

The invention discloses a power circuit based on a resettable fuse and an electronic product. The power circuit is characterized in that a resettable fuse main path and a resettable fuse alternative path which are in parallel connection are disposed in a power supply circuit for conveying an input power supply; the voltage difference at two ends of the resettable fuse in the main path is collected, the resettable fuse main path is used to convey the input power supply if the voltage different is smaller than a set threshold V, or else the resettable fuse alternative path is used to convey the input power supply. By the arrangement, the power circuit and the electronic product have the advantages that the service cycle of the electronic product using the resettable fuse can be prolonged, excessively-large voltage drop of the fuse due to the fact that the resettable fuse bears excessively-large current impact and bears the impact for an excessively-long time, system operation instability and system failure are avoided, and the overall performance of the electronic product is evidently increased.

The invention discloses a mobile phone changer charging a mobile phone with a dry battery. The mobile phone charger mainly comprises a dry battery, a DC/DC voltage booster circuit, a voltage set circuit, an output control circuit and an input interface and adapter cables matched with the output interface, wherein the output control circuit is formed by parallelly connecting an old-standard output circuit and a new-standard output circuit, and the output interface is matched and connected with an old-standard adapter cable and a new-standard adapter cable. The old-standard output circuit is formed by connecting a chip resistor, a field-effect tube and a resettable fuse. The new-standard output circuit is formed by connecting a chip resistor, a field-effect tube and a resettable fuse. The old-standard output circuit and the new-standard output circuit are parallelly connected with the output interface formed by a mini USB socket. The old-standard adapter cable and the new-standard adapter cable are mini USB adapter cables matched with the mini USB sockets. The mobile phone charger has the characteristics of meeting charging needs of new and old-standard mobile phones, along with simple structure, convenient use, high battery energy conversion efficiency, high battery utilization rate and so on.

An automatic electric unblocking valve comprises a valve body and an electric executing mechanism. The electric executing mechanism comprises a direct-current motor, an automatic valve switching-on device and a PTC (positive temperature coefficient) resettable fuse. The automatic valve switching-on device can enable the valve body to act in the switching-on direction of an electric valve when an external power source of the electric valve is not enough to supply power for the direct-current motor. The PTC resettable fuse is serially connected behind an input end of the external power source of the electric valve and in front of the electric executing mechanism, is in low-resistance state when the direct-current motor normally works, and is in high-resistance state when the direct-current motor is blocked. The automatic valve switching-on device is started so as to enable the electric valve to execute valve switching-on operation, and then the PTC resettable fuse resets to the low-resistance state after resetting time. Accordingly, the external power source is conducted, the electric valve keeps executing valve switching-off operation and automatically repeats once or more times of valve switching on and off operations, and finally blockage objects are automatically removed.

This disclosure relates to a heat sensitive electrical safety device with a manually resettable device and an automatically resettable fuse. The manually settable fuse prolongs the serviceable life of the automatically resettable fuse.