A lighting relay panel may include lower-cost features or components related to improved safety and reliability. In some cases, the relay panel includes a power supply capable of protecting the panel from high-voltage and high-current transients. A microcontroller may determine a power interruption based on a zero-cross signal received from the power supply, and may also configure latching relays during the interruption. In some implementations, the relay panel includes a relay sense circuit that is capable of receiving actuation signals from multiple relays connected to different phases of a power signal, and the microcontroller may synchronize or repeat the actuations based on a signal from the relay sense circuit. The microcontroller may generate relay addresses based on the relay positions within the relay panel. In some cases, the relay panel may include isolation circuits that are capable of providing an isolated control signal having an improved voltage range.

A lighting relay panel may include lower-cost features or components related to improved safety and reliability. In some cases, the relay panel includes a power supply capable of protecting the panel from high-voltage and high-current transients. A microcontroller may determine a power interruption based on a zero-cross signal received from the power supply, and may also configure latching relays during the interruption. In some implementations, the relay panel includes a relay sense circuit that is capable of receiving actuation signals from multiple relays connected to different phases of a power signal, and the microcontroller may synchronize or repeat the actuations based on a signal from the relay sense circuit. The microcontroller may generate relay addresses based on the relay positions within the relay panel. In some cases, the relay panel may include isolation circuits that are capable of providing an isolated control signal having an improved voltage range.

The present invention is a variable control switch. In particular, it is a control switch with modifiable variables for activation and deactivation of primary and secondary devices. The control switch has an input plug and two output plugs. The control switch has a sensing circuit connected between the input plug and two output plugs and has an output comprising DC voltage varying proportionally to the current passing between said first and second output plugs. The sensing circuit is connected to a microcontroller unit that controls current to the first or second outputs based on a set of pre-determined variables, including a termination threshold.

The present invention is a variable control switch. In particular, it is a control switch with modifiable variables for activation and deactivation of primary and secondary devices. The control switch has an input plug and two output plugs. The control switch has a sensing circuit connected between the input plug and two output plugs and has an output comprising DC voltage varying proportionally to the current passing between said first and second output plugs. The sensing circuit is connected to a microcontroller unit that controls current to the first or second outputs based on a set of pre-determined variables, including a termination threshold.

A magnetic switch controlled circuit for an electrical appliance includes a voltage input terminal, a voltage output terminal, a magnetic switch, a relay circuitry and a turn-off delay circuitry. When the magnetic switch detects a first change in the magnetic field from an idle status, the relay circuitry is configured to output an output voltage to the voltage output terminal so as to supply power to the electrical appliance. When the magnetic switch detects a second change in the magnetic field from the first change in the magnetic field, the turn-off delay circuitry is configured to control the relay circuitry to continue outputting the output voltage to the voltage output terminal for a predetermined period of time, the relay circuitry being switched off by the turn-off delay circuitry after the predetermined period of time elapses.

A load control device may control power delivered to an electrical load from an AC power source. The load control device may include a controllably conductive device adapted to be coupled in series electrical connection between the AC power source and the electrical load, a zero-cross detect circuit configured to generate a zero-cross signal representative of the zero-crossings of an AC voltage. The zero-cross signal may be characterized by pulses occurring in time with the zero-crossings of the AC voltage. The load control device may include a control circuit operatively coupled to the controllably conductive device and the zero cross detect circuit. The control circuit may be configured to identify a rising-edge time and a falling-edge time of one of the pulses of the zero-cross signal, and may control a conductive state of the controllably conductive device based on the rising-edge time and the falling-edge time of the pulse.

A load control device may control power delivered to an electrical load from an AC power source. The load control device may include a controllably conductive device adapted to be coupled in series electrical connection between the AC power source and the electrical load, a zero-cross detect circuit configured to generate a zero-cross signal representative of the zero-crossings of an AC voltage. The zero-cross signal may be characterized by pulses occurring in time with the zero-crossings of the AC voltage. The load control device may include a control circuit operatively coupled to the controllably conductive device and the zero cross detect circuit. The control circuit may be configured to identify a rising-edge time and a falling-edge time of one of the pulses of the zero-cross signal, and may control a conductive state of the controllably conductive device based on the rising-edge time and the falling-edge time of the pulse.

A passive timing circuit for optocoupled relay has a rail having an output for an input terminal of the optocoupled relay. The circuit also has a capacitive network between the rail and ground. The capacitance of the capacitive network can be configured according to a timing period and the circuit does not require a voltage source other than that applied by the input terminal which, over the time period, increases voltage of the rail until the relay switches.

A passive timing circuit for optocoupled relay has a rail having an output for an input terminal of the optocoupled relay. The circuit also has a capacitive network between the rail and ground. The capacitance of the capacitive network can be configured according to a timing period and the circuit does not require a voltage source other than that applied by the input terminal which, over the time period, increases voltage of the rail until the relay switches.

A power switch controller includes a condition detector, a zero crossing detector, a retimer, and a driver. The condition detector detects a change in a sense signal towards a first or second condition. The zero crossing detector detects zero crossings in an AC powerline signal. The power switch controller drives a latching relay that connects a load to powerlines. The power switch controller activates or deactivates the latching relay based on the sensed condition, and retimes activation and deactivation pulses to align the relay contact opening and closing times to coincide with the AC powerline zero crossings, compensating for contact travel times. The activation and deactivation pulses have a duration of max 20 ms, and an amplitude of at least 110% of the maximum sustainable voltage for the relay coil(s). A power-on reset deactivates the relay, aligned with a second AC zero crossing.