A control circuit for an AC/DC converter includes an AC detection circuit that periodically determines from a change in the AC input voltage whether AC voltage is being input and, upon determining that AC voltage is being input, outputs an AC detection signal that takes a HIGH level only for a prescribed duration; and an enable signal conversion circuit that filters the AC detection signal to generate the enable signal that is in a HIGH state when the AC detection signal is in the HIGH level and that becomes the LOW state after a prescribed time has passed since the AC detection signal becomes a LOW level unless the AC detection signal rises to the HIGH level again, thereby producing the enable signal that is more responsive.

A control circuit for an AC/DC converter includes an AC detection circuit that periodically determines from a change in the AC input voltage whether AC voltage is being input and, upon determining that AC voltage is being input, outputs an AC detection signal that takes a HIGH level only for a prescribed duration; and an enable signal conversion circuit that filters the AC detection signal to generate the enable signal that is in a HIGH state when the AC detection signal is in the HIGH level and that becomes the LOW state after a prescribed time has passed since the AC detection signal becomes a LOW level unless the AC detection signal rises to the HIGH level again, thereby producing the enable signal that is more responsive.

A voltage testing system. The voltage testing system includes a pair of probes, each having a housing with a first end and a second end, wherein the pair of probes are electrically connected by a wire affixed to the first end of each of the pair of probes. A prong extends from the second end of the pair of probes, wherein a pin extends therethrough. The pin is electrically conductive, such that the pin is in communication with a fuse and a plurality of lights within the housing. The pin can be spring-biased such that a connection is formed between the fuse and the pin when the force is applied to the pin. The fuse can sever the electrical connection when a set current is transmitted through the fuse, such that a user is protected from excessive currents. The plurality of lights illuminate in response to receiving a preset voltage.

A voltage testing system. The voltage testing system includes a pair of probes, each having a housing with a first end and a second end, wherein the pair of probes are electrically connected by a wire affixed to the first end of each of the pair of probes. A prong extends from the second end of the pair of probes, wherein a pin extends therethrough. The pin is electrically conductive, such that the pin is in communication with a fuse and a plurality of lights within the housing. The pin can be spring-biased such that a connection is formed between the fuse and the pin when the force is applied to the pin. The fuse can sever the electrical connection when a set current is transmitted through the fuse, such that a user is protected from excessive currents. The plurality of lights illuminate in response to receiving a preset voltage.

The present disclosure pertains to systems and methods for measuring electrical parameters in an electric power system. In one embodiment, a system may include a line-mounted wireless current sensor comprising a current monitoring subsystem to generate a current measurement of an alternating current flow through an electrical conductor. The line-mounted wireless current sensor may harvest power from the electrical conductor. A processing subsystem may generate a message comprising the current measurement, and the message may be transmitted at a synchronization point using a wireless communication subsystem. An intelligent electronic device (IED) may receive the message. The IED may further generate a voltage and generate a phasor based on the current measurement and the voltage measurement. A control action subsystem may implement a control action (e.g., selectively connecting or disconnecting a capacitor bank) based on the phasor.

The present disclosure pertains to systems and methods for measuring electrical parameters in an electric power system. In one embodiment, a system may include a line-mounted wireless current sensor comprising a current monitoring subsystem to generate a current measurement of an alternating current flow through an electrical conductor. The line-mounted wireless current sensor may harvest power from the electrical conductor. A processing subsystem may generate a message comprising the current measurement, and the message may be transmitted at a synchronization point using a wireless communication subsystem. An intelligent electronic device (IED) may receive the message. The IED may further generate a voltage and generate a phasor based on the current measurement and the voltage measurement. A control action subsystem may implement a control action (e.g., selectively connecting or disconnecting a capacitor bank) based on the phasor.

An electrical receptacle including an outlet for electrically connecting to an external load, a load terminal electrically connected to the outlet, a line terminal electrically connected to a line and configured to receive line power, an interrupting device, and a testing circuit. The interrupting device electrically connects the load terminal to the line terminal when in a first condition and electrically disconnects the load terminal and the line terminal when in a second condition. The testing circuit is configured to determine when the external load is electrically connected to the outlet, and place the interrupting device in the first condition when the external load is electrically connected to the outlet.

An electrical receptacle including an outlet for electrically connecting to an external load, a load terminal electrically connected to the outlet, a line terminal electrically connected to a line and configured to receive line power, an interrupting device, and a testing circuit. The interrupting device electrically connects the load terminal to the line terminal when in a first condition and electrically disconnects the load terminal and the line terminal when in a second condition. The testing circuit is configured to determine when the external load is electrically connected to the outlet, and place the interrupting device in the first condition when the external load is electrically connected to the outlet.

A voltage on-off detector includes an inverter between a first voltage source and a first node and having an input terminal that receives a third voltage, a first transistor having a first gate, and a first source and a first drain between the first node and a second voltage source, a second transistor having a second source connected to the second voltage source, and a second gate and a second drain connected to the first node, and an amplifier having an input terminal connected to an output terminal of the inverter and configured to output a first voltage from the first voltage or a second voltage from the second voltage source based on or in response to an output of the inverter.

A voltage on-off detector includes an inverter between a first voltage source and a first node and having an input terminal that receives a third voltage, a first transistor having a first gate, and a first source and a first drain between the first node and a second voltage source, a second transistor having a second source connected to the second voltage source, and a second gate and a second drain connected to the first node, and an amplifier having an input terminal connected to an output terminal of the inverter and configured to output a first voltage from the first voltage or a second voltage from the second voltage source based on or in response to an output of the inverter.