Disclosed herein is a device comprising a pulse trigger switch module configured to generate a first control signal in response to a first input signal value and generate the second control signal in response to a second input signal value. An on pulse generator module provides a first pulse signal having a first predetermined pulse duration in response to the first control signal and an off pulse generator module provides a second pulse signal having a second predetermined pulse duration in response to the second control signal. An on pulse switch module connects a power signal to an output in response to the first pulse signal and an off pulse switch module connects the power signal to the output in response to the second pulse signal.

A driving circuit includes a relay driver for selectively connecting a relay coil with (a) a first current path between the relay driver and a relay voltage input or (b) a second current path between the relay driver and a ground connection. Another relay driver selectively connects the coil with (a) a third current path between the other relay driver and the relay voltage input or (b) a fourth current path between the other relay driver and the ground connection. The relay drivers may connect the coil between the second and third current paths for latching the relay, and between the first and fourth current paths for unlatching the relay. The driving circuit applies signals of opposite polarity and different magnitudes through the coil to latch and unlatch the relay. The signal for unlatching can be of lower voltage than the signal for latching the relay.

A thermal hazard protection circuit for a transportation vehicle comprises an interruptible power circuit connected between a power source and load, and a failsafe circuit operative to permanently interrupt current flow under an overcurrent condition. The interruptible power circuit comprises a Positive Temperature Coefficient (PTC) component in series with bi-stable relay configured as a SPST switch. The failsafe circuit comprises a failsafe relay energized by current in the interruptible power circuit. An input of the failsafe relay is connected to the power source, and a normally closed (NC) output (not connected to the input so long as the failsafe relay is energized) is connected to a control input of the bi-stable relay that opens the SPST switch. In an overcurrent condition, the PTC component limits current flow, switching the failsafe relay input to its NC outputs, providing a control signal to open the SPST switch, rendering the interruptible power circuit non-conductive and isolating the load.

A power supply system comprises an AC input, an AC output, and a DC input; a DC intermediate circuit; a first converter connected, via a first bistable switching circuit, between the AC input and the DC intermediate circuit; a second converter connected, via a second bistable switching circuit, between the DC intermediate circuit and the AC output; a third converter connected, via a third bistable switching circuit, between the DC input and the DC intermediate circuit; a bypass circuit connected, via a bypass bistable switching circuit, between the AC input and the AC output and configured to provide a bypassing path from the AC input to the AC output; and a control unit.

Provided herein is an improved bi-stable relay. In some embodiments, the bi-stable relay assembly may include a housing, and a core assembly within the housing. The core assembly may include a coil support structure, a first coil and a second coil along a central section of the coil support structure, a first magnet at a first end of the coil support structure, a second magnet at a second end of the coil support structure, and a first electromagnetic shell component and a second electromagnetic shell component each extending between the first and second magnets.

The present invention relates to a technology that monitors a normal operation state through whether the flow of minute current is maintained in real time when a latch relay is turned on and allows the latch relay to be forcibly turned off through current prestored in a supercapacitor when an off operation of the latch relay is not normally performed.

A method of controlling the behavior of a latching relay includes receiving a configuration signal of either a first behavior signal or a second behavior signal, receiving a power status signal of either a powered or unpowered signal, receiving either a low-to-high or a high-to-low signal command signal, generating latching pulse in response to receiving a powered signal input as the power status signal and a low-to-high signal as the command signal, generating an unlatching pulse in response to receiving a powered signal input as the power status signal and a high-to-low signal as the command signal input, and generating an unlatching pulse in response to receiving the second behavior signal as the configuration signal and the unpowered signal as the power status signal.

A communication device including an actuator driven by a control circuit, the communication device further including: a connector that can be connected to the control circuit, to receive a state signal sent by the control circuit and to receive an electrical power supply voltage supplied by the switching unit; a capacitor configured to be recharged from the power supply voltage received from the input connector when the state signal takes a predefined value; a bistable relay comprising a normally-open electrical contact connected to output terminals to form a dry electrical contact; and a pulse generator supplied by the capacitor and being configured to excite the bistable relay when the capacitor reaches a predefined level of charge.

Provided herein is an improved bi-stable relay. In some embodiments, the bi-stable relay assembly may include a housing, and a core assembly within the housing. The core assembly may include a coil support structure, a first coil and a second coil along a central section of the coil support structure, a first magnet at a first end of the coil support structure, a second magnet at a second end of the coil support structure, and a first electromagnetic shell component and a second electromagnetic shell component each extending between the first and second magnets.

Provided herein are coil support structures and methods of retaining a printed circuit board assembly (PCBA) of a relay. In some embodiments, a bi-stable relay assembly may include a coil support structure, having a central section extending between a first end section and a second end section, and set of biasable fasteners extending from the first end section and the second end section, wherein each of the set of biasable fasteners includes a sloped engagement surface and a retention slot. The coil support structure may further include a PCBA coupled to the first and second end sections of the coil support structure, wherein the coil support structure extends within the retention slot of each of the set of biasable fasteners.