A system for monitoring a circuit breaker includes: at least one sensor and a processor. The at least one sensor is configured to be located and utilized to obtain at least one sensor data of a main shaft of an operational circuit breaker, and the at least one sensor is configured to provide the at least one sensor data of the main shaft of the operational circuit breaker to the processor. The processor is configured to determine position and/or velocity information for a moveable contact of the operational circuit breaker, where the determination comprises analysis of the at least one sensor data of the main shaft of the operational circuit breaker by a trained neural network implemented by the processor.

A system and method for monitoring energy use in an electronic device. In one embodiment, an energy monitoring system includes a processor and an energy monitor module. The energy monitor module includes instructions that when executed cause the processor to receive values of measured parameters of a pulse signal that controls the switching of energy to an energy storage device in a switch mode power supply that provides power to an electronic device. The instructions also cause the processor to determine, based on the values of measured parameters, attributes of operation of the electronic device powered by the energy source during an interval corresponding to the measured parameters. The instructions further cause the processor to generate, based on the attributes of operation, a control signal that causes the electronic device to change the loading of the power supply by the electronic device.

A system and method for monitoring energy use in an electronic device. In one embodiment, an energy monitoring system includes a processor and an energy monitor module. The energy monitor module includes instructions that when executed cause the processor to receive values of measured parameters of a pulse signal that controls the switching of energy to an energy storage device in a switch mode power supply that provides power to an electronic device. The instructions also cause the processor to determine, based on the values of measured parameters, attributes of operation of the electronic device powered by the energy source during an interval corresponding to the measured parameters. The instructions further cause the processor to generate, based on the attributes of operation, a control signal that causes the electronic device to change the loading of the power supply by the electronic device.

The present disclosure relates to a relay examination device and a battery management system including the same, the relay examination device includes a first resistor unit having one end connected to one end of a relay, a second resistor unit having one end connected to the other end of the first resistor unit, a power unit connected to the other end of the second resistor unit and configured to supply power, and a control unit configured to receive a voltage signal applied between the first resistor unit and the second resistor unit and to examine whether the relay is open or closed or whether the relay has malfunctioned.

A logic control system for magnetic track braking of a rail transit vehicle includes a magnetic track braking control circuit, a magnetic track braking power supply execution circuit, and a magnetic track braking status monitoring and feedback circuit. The magnetic track braking control circuit includes a pneumatic actuator relay, an electromagnet relay, a system protection relay, a power-on delay relay, a power-off delay relay, an automatic control branch circuit, and a manual control branch circuit. The pneumatic actuator relay is connected to the power-on delay relay, and the system protection relay is connected to the power-off delay relay. The automatic control branch circuit includes a first isolation magnetic track braking switch and an emergency braking relay contact. The manual control branch circuit includes a first circuit breaker, a cab signal option switch, a second isolation magnetic track braking switch and a manual touch button.

A welding detection device includes a first circuit including a detection element, a first circuit power supply, and a second circuit. The first circuit is connected to a first line connecting a power supply and a main relay and a second line connecting a load and the main relay. The first circuit power supply supplies DC power to the first circuit. The first circuit detects welding in the main relay based on whether or not a current from the first circuit power supply has flowed to the detection element through the main relay when the main relay is controlled to be in an open state from a closed state. The second circuit cuts off the first circuit only when the voltage difference is present between the first line and the second line while the main relay is controlled to be in an open state from a closed state.

A protection system includes: a first positive terminal; a second positive terminal; a first relay configured to be opened and closed by contact and separation of a first contact portion and a second contact portion; and a fuse. The first relay and the fuse are connected in series between the first positive terminal and the second positive terminal, and when an electric current exceeding a threshold current flows to the first relay, the first contact portion and the second contact portion are separated in the first relay at a first time, and when the first contact portion and the second contact portion are separated, an arc discharge occurs between the first contact portion and the second contact portion, an arc discharge occurs between the first electrode and the second electrode of the fuse at a second time, the arc discharge occurs at both of the first relay and the fuse and a difference in potential between the first electrode and the second electrode of the fuse increases during a period between the second time and a third time, and the first positive terminal and the second positive terminal are disconnected at a fourth time.

A method of detecting welded contacts in a relay. The method includes performing, at a first point in time, the applying of a drive to the activation coil to conduct a coil current through the activation coil, the coil current increasing to a first current level, the first current level being less than a pull-in current of the relay; responsive to the coil current reaching the first current level, turning off the drive to the activation coil to discharge the coil current at a first clamping voltage; and measuring a first discharge time corresponding to a first inductance from the turning off of the drive to the activation coil to the coil current reaching a second current level, the second current level being less than the first current level. These operations are repeated at a second point in time to obtain a second inductance. Comparison of the first inductance and second inductance determines whether a difference between the first and second inductances exceeds a comparison criterion.

An anti-short circuit structure (10) of a high-capacity relay, the structure (10) comprising a housing assembly (100) and a pushing assembly (200). The housing assembly (100) comprises two static contacts (110), a first magnetically conductive block (120), a cover body (130), a transition block (160), and a yoke plate (140). The first magnetically conductive block (120) is disposed on an inner side surface of the top part of the cover body (130). The pushing assembly (200) comprises a fixing support (210), a stop piece (220), a movable reed (230), a second magnetically conductive block (240), an elastic member (250), and a push rod (260). The fixing support (210) comprises two fixing side arms (211) and a receiving plate (212). One end of the stop piece (220) is connected to the tail end of one fixing side arm (211), and the other end of the stop piece (220) is connected to the tail end of the other fixing side arm (211). Two ends of the movable reed (230) are disposed facing the two static contacts (110) respectively, and the second magnetically conductive block (240) is disposed facing the first magnetically conductive block (120). The first magnetically conductive block (120) and the second magnetically conductive block (240) are used to form magnetic flux. In the described anti-short circuit structure (10), when a coil is excited, the positions of the first magnetically conductive block (120) and the second magnetically conductive block (240) do not change due to overtravel. A magnetic air gap does not increase as overtravel increases, and an increase in overtravel does not affect magnetic attraction and does not affect the anti-short circuit function of the relay.

A coil drive device energizes an operation coil to close an electromagnetic contactor. A rectifier outputs, to a power supply line, an input voltage obtained by full-wave rectification of an AC voltage supplied from a main power source. A controller controls on and off of a switching element connected to a power supply line in series with the operation coil. The controller controls a duty ratio that is an on period ratio of the switching element in each switching period in accordance with a value of a parameter calculated from a detected value of the input voltage, in at least a partial period after start of energization of the operation coil in response to a close command for the electromagnetic contactor.