14results about "Contact-welding prevention/breaking" patented technology

In a case where a load current flows in an energized state where a power supply is connected to a load, it is assumed that a measured voltage fluctuates due to a voltage drop caused by contact resistance of a relay contact, and thus the relay state cannot be accurately diagnosed. A relay control device that controls a relay connected between a secondary battery and a load device calculates, in a failure diagnosis during energization with the relay being closed, a contact resistance value of the relay based on a voltage applied to the relay and a current flowing through the secondary battery, and determines a first threshold set as a variable value in accordance with a temperature change amount of the relay and compares the calculated contact resistance value with the first threshold to diagnose a failure of the relay.

A method for monitoring contactor health of an electrical contactor of an electrical device, the electrical contactor being switchable in a switching event between an open state and a closed state or between a closed state and an open state, in response to a switching event command, the method includes determining a current value indicative of a current flowing in the closed electrical contactor at a time proximate the switching event, attributing a percentage of a total contactor life estimate to the switching event based on the current value, determining an updated percentage remaining contactor life estimate by subtracting the percentage of the total contactor life estimate from an initial percentage remaining contactor life estimate, and outputting the updated percentage remaining contactor life estimate.

The invention presents a motorized contactor comprising at least three pairs of contacts composed of a fixed contact and a movable contact, these pairs of contacts each having a closed state where the movable contact is in the position of maximum approach to said associated fixed contact and an open state where the movable contact is as far apart as possible from the associated fixed contact, all of the movable contacts being mobilized by at least one carriage,as well as an electric actuator controlling the movement of the entire carriage(s) reversibly between a position P1 where a first pair of contacts is in the closed state and at least two pairs of contacts are in the open state and a position P2 where said first pair of contacts is in the open state and said at least two pairs of contacts are in the closed state, characterized in that the open and closed states of each of said at least 3 pairs of contacts is mechanically imposed by the control of the electric actuator. The electric actuator mechanically controls, via said carriage(s), the forced passage between a closed state and an open state of each of said at least three pairs of contacts. Abstract figure: Figure 3,

An operating mechanism includes an input shaft, an output shaft, and a connecting rod assembly, and the connecting rod assembly includes an input connecting rod and an output connecting rod. A disconnector includes a plurality of stacked sub-switches, and each sub-switch includes a movable contact and a stationary contact. The input shaft is fastened to the handle, the connecting rod assembly is configured to be in transmission connection to the input shaft and the output shaft, and the output shaft is configured to drive the movable contact to rotate. The handle is configured to drive the input shaft to rotate, and the input shaft is configured to drive the input connecting rod to rotate, so that the input connecting rod collides with the output connecting rod, and the output connecting rod drives the output shaft to rotate, to separate the movable contact from the stationary contact.

This invention provides a driving structure for a high-voltage DC relay, comprising: a fixed bracket, a stop plate, a movable spring, and an elastic element. The fixed bracket includes two fixed side arms, a receiving plate, and a pushing rod. The two fixed side arms are respectively disposed on both sides of the receiving plate, and the pushing rod is connected to the bottom of the receiving plate. One end of the stop plate is connected to the end of one fixed side arm, and the other end of the stop plate is connected to the end of the other fixed side arm. One end of the elastic element abuts against the receiving plate, and the other end of the elastic element abuts against the movable spring. The movable spring abuts against the stop plate, and the stop plate is provided with an arc-isolating portion. The above-mentioned driving structure for the high-voltage DC relay adopts a bottom-up assembly method, with the elastic element, movable spring, and stop plate stacked sequentially. The stop plate is connected and fixed to the two fixed side arms, making the assembly process simple and fast, improving the assembly efficiency of the high-voltage DC relay. Furthermore, the arc-isolating portion isolates electric arcs, improving the reverse electrical life of the high-voltage DC relay.

A diagnostic method for the remaining service life of a switching device, wherein performance characteristics of the switching device (1) are obtained with a measuring unit (41, 42) and then used as historical condition value data relating to a deterioration state of the switching device (1), are estimated with a condition value estimation unit (51) on the basis of measurement data obtained by the measuring unit (41, 42); wherein, on the basis of the historical condition value data, a remaining service life estimation unit (53) generates two or more sets of data series, namely - data series in which the state values ​​are plotted, the abscissa indicating the elapsed time during an operating period of the switching device (1); - data series in which the state values ​​are plotted, the abscissa indicating the number of operations of the switching device (1) during the operating period of the switching device (1); - data series in which the state values ​​are plotted, the abscissa indicating the non-operative time of the switching device (1) during the operating period of the switching device (1); and - data series in which the state values ​​are plotted, the abscissa indicating the accumulated operating time of the switching device (1) during the operating time of the switching device (1); wherein, on the basis of the data series among the generated two or more data series sets for which the correlation between the abscissa values ​​of the generated data series sets and the state values ​​corresponding to the respective abscissa values ​​is the strongest, a first deterioration tendency of the switching device (1) is determined; wherein a first estimated value of the remaining service life of the switching device (1) is calculated on the basis of the first deterioration tendency; wherein the first deterioration trend is removed from the generated two or more data series sets; wherein a second deterioration tendency is determined on the basis of the data series from the two or more data series sets from which the first deterioration tendency has been removed, for which the correlation between the abscissa values ​​of the data series sets from which the first deterioration tendency has been removed and the condition values ​​corresponding to the respective abscissa values ​​is the strongest; wherein a second estimated value of the remaining service life of the switching device (1) is calculated on the basis of the second deterioration tendency; and wherein the remaining service life of the switching device (1) is then determined at least on the basis of the first estimated value and the second estimated value of the remaining service life.

Provided is a drive structure for a high-voltage direct-current relay, the drive structure comprising: a retaining frame, a stopper piece, a movable spring piece, and an elastic member. The retaining frame comprises two retaining side arms, a support plate, and a drive rod. The two retaining side arms are disposed at two sides of the support plate, and the drive rod is connected to a bottom portion of the support plate. The stopper piece has one end connected to a terminal end of one of the retaining side arms, and the other end connected to a terminal end of the other retaining side arm. The elastic member has one end pressing against the support plate and the other end pressing against the movable spring piece, the movable spring piece presses against the stopper piece, and the stopper piece is provided with an arc isolation portion. The drive structure for a high-voltage direct-current relay has an bottom-up assembly manner, in which the elastic member, the movable spring piece, and the stopper piece are stacked sequentially, and the stopper piece is connected to and retained by the two retaining side arms, thereby realizing a simple and fast assembly process, and increasing assembly efficiency of high-voltage direct-current relays. In addition, the arc isolation portion has an effect of isolating arcs, thereby improving a service life of high-voltage direct-current relays despite reverse arcs.

The invention relates to a motor-driven contactor comprising at least three pairs of contacts consisting of a fixed contact and a movable contact, these pairs of contacts each having a closed state in which the movable contact is positioned as close as possible to the associated fixed contact and an open state in which the movable contact is as far apart as possible from the associated fixed contact, the set of movable contacts being made to move by at least one carriage, and an electric actuator controlling the displacement of all of the carriage(s) reversibly between a position PI in which a first contact pair is in the closed state and at least two pairs of contacts are in the open state and a position P2 in which the first pair of contacts is in the open state and the at least two pairs of contacts are in the closed state, characterized in that the open state and closed state of each of the at least 3 pairs of contacts are mechanically applied by the control of the electric actuator. The electric actuator mechanically controls, via the carriage(s), the forced transition between a closed state and an open state of each of the at least three pairs of contacts.

A circuit breaker protects an electric low-voltage circuit, having: a housing with grid-side connections and load-side connections for the low-voltage circuit; and a mechanical separating contact unit connected to an electronic interruption unit in series. The mechanical separating contact unit is paired with the load-side connections, and the electronic interruption unit is paired with the grid-side connections. The mechanical separating contact unit is switched by opening contacts to prevent a current flow or by closing the contacts for a current flow in the low-voltage circuit. Semiconductor-based switch elements of the electronic interruption unit are switched to a high-ohmic state to prevent a current flow or to a low-ohmic state for a current flow in the low-voltage circuit. A current sensor ascertains the level of the current of the low-voltage circuit and a controller is connected to the current sensor, the mechanical separating contact unit, and the electronic interruption unit.

This application provides a direct current switch and a power converter including the direct current switch. The direct current switch includes an operating mechanism, a handle, and a disconnector. The operating mechanism includes an input shaft, an output shaft, and a connecting rod assembly, and the connecting rod assembly includes an input connecting rod and an output connecting rod. The disconnector includes a plurality of stacked sub-switches, and each sub-switch includes a movable contact and a stationary contact. The input shaft is fastened to the handle, the connecting rod assembly is configured to be in transmission connection to the input shaft and the output shaft, and the output shaft is configured to drive the movable contact to rotate. The handle is configured to drive the input shaft to rotate, and the input shaft is configured to drive the input connecting rod to rotate, so that the input connecting rod collides with the output connecting rod, and the output connecting rod drives the output shaft to rotate, to separate the movable contact from the stationary contact. In this way, when friction between the movable contact and the stationary contact increases, or when rust or adhesion occurs between the movable contact and the stationary contact, larger driving force can be provided for the movable contact, to reliably separate the movable contact from the stationary contact.

The invention relates to a method for releasing a switching contact (18) of a mechanical high-voltage switch (10), comprising a mechanical high-voltage switch (10) having a housing (12) and a mechanical vibration device (22) which is arranged externally on the housing (12) of the high-voltage switch (10), wherein a switching state of the mechanical high-voltage switch (10) is monitored, wherein a vibration protocol is activated and the mechanical vibration device (22) is controlled according to the vibration protocol when an operating state of the mechanical high-voltage switch (10) with a high risk of sticking or a stuck switching contact (18) of the mechanical high-voltage switch (10) is detected, wherein vibrations generated by the mechanical vibration device (22) are transmitted from the outside via a housing (12) of the mechanical high-voltage switch (10) to the switching contact (18).wherein at the end of the vibration protocol a check of the switching state of the mechanical high-voltage switch (10) is carried out, as well as a device (20) for carrying out such a method for releasing a switching contact (18) of a mechanical high-voltage switch (10).

A contactor assembly is provided for a battery module of an electric work vehicle comprising a battery management system. The battery module is configured to be charged and discharged via a first circuit. The first circuit comprises the contactor assembly, the contactor assembly comprising a first contactor in series with a second contactor. Each of the first contactor and the second contactor is configured to have a higher resistance to welding for a switching current flowing in a preferred direction than in a nonpreferred direction. The first contactor and the second contactor have opposite preferred directions. In response to an instruction to switch the contactor assembly, the battery management system is configured to determine whether the switching current direction is in the first direction or in the second direction, and to break or complete the first circuit with the contactor having a preferred direction in the switching current direction.

A system includes a relay system and a controller. The relay system includes a plurality of relays, each having a first contact on an input side of the respective relay, the input side coupled to a power source, a second contact on a load side of the respective relay coupled to a load, and a spanner configured to close the first and second contacts of the respective relay when activated by a close signal. The load sides of each of the respective relays are coupled through their respective loads. The controller is configured to measure a voltage between a spanner of a first relay and an input side of a second relay. Based on the voltage between the spanner of the first relay and the input side of the second relay, the controller determines whether an electrical weld of one of the contacts of the first relay exists.

Actuating mechanism of a rotary switch with contacts, comprising a mounting base (1) in which an actuating rod assembly (2) and a rotary plate assembly (3) for manual rotation are arranged, wherein an energy storage element (4) is provided between the actuating rod assembly (2) and the rotary plate assembly (3), wherein the rotary plate assembly (3) closes or opens the rotary switch by forward or backward rotation, wherein, when the actuating rod assembly (2) is rotated, the energy storage element (4) rotates the rotary plate assembly (3), wherein a limiting element (5) is pivotally mounted in the mounting base (1), wherein the limiting element (5) has a pressure section (501) and a locking section (502), wherein the rotary plate assembly (3) interacts with the pressure section (501) so that the limiting element (5) can be rotated relative to the mounting base (1) between a first position and a second position, wherein,When the rotary plate assembly (3) is in the closed position, the rotary plate assembly (3) abuts the pressure section (501), so that the limiting element (5) is in the first position, wherein the locking section (502) is on the rotation path of the actuating rod assembly (2) or the energy storage element (4) to lock the rotation of the actuating rod assembly (2) in the case of welded contacts of the rotary switch, wherein when the rotary plate assembly (3) is in the open position, the rotary plate assembly (3) releases the pressure section (501), wherein the limiting element (5) is in the second position, so that the locking section (502) releases the actuating rod assembly (2).