A system and method for suppressing EMP-induced voltage surges due to detonation of a nuclear weapon at high altitude generating an EMP (HEMP) comprising E1, E2, and E3 component pulses. A plurality of shunting assemblies, each including transient voltage suppressors (TVSs), metal oxide varistors (MOVs), gas discharge tubes (GDTs), other mechanical, electrical and ionization discharge devices (IDDs) and combinations thereof of surge limiting technologies, are positioned intermediate a signal stream and a plurality of electronic device ports associated with a plurality of communication channels for sensing upstream of the communication channels an overvoltage associated with each of the E1, E2, and E3 components of the EMP and shunting the over-voltages to predetermined allowable levels within the predetermined time.

A system and method for suppressing EMP-induced voltage surges due to detonation of a nuclear weapon at high altitude generating an EMP (HEMP) comprising E1, E2, and E3 component pulses. A plurality of shunting assemblies, each including transient voltage suppressors (TVSs), metal oxide varistors (MOVs), gas discharge tubes (GDTs), other mechanical, electrical and ionization discharge devices (IDDs) and combinations thereof of surge limiting technologies, are positioned intermediate a signal stream and a plurality of electronic device ports associated with a plurality of communication channels for sensing upstream of the communication channels an overvoltage associated with each of the E1, E2, and E3 components of the EMP and shunting the over-voltages to predetermined allowable levels within the predetermined time.

A system and method for suppressing EMP-induced voltage surges due to detonation of a nuclear weapon at high altitude generating an EMP (HEMP) comprising E1, E2, and E3 component pulses. A plurality of shunting assemblies, each including transient voltage suppressors (TVSs), metal oxide varistors (MOVs), gas discharge tubes (GDTs), other mechanical, electrical and ionization discharge devices (IDDs) and combinations thereof of surge limiting technologies, are positioned intermediate a signal stream and a plurality of electronic device ports associated with a plurality of communication channels for sensing upstream of the communication channels an overvoltage associated with each of the E1, E2, and E3 components of the EMP and shunting the over-voltages to predetermined allowable levels within the predetermined time.

A circuit interrupting device with overload current detection is provided. It comprises a hot conductor, a main contactor and a first electromagnetic device configured to remove power from an electrical circuit when overload current exceeds a predetermined % of a rated load current. It further comprises a section of conductor that generates heat and a thermal overload current detection mechanism including a temperature sensing switch having contacts. The temperature sensing switch closes the contacts when a temperature reaches a predefined temperature threshold corresponding to an overload current, in which case the temperature sensing switch electrically couples power to a second electromagnet which is disposed across the hot conductor and a connection to a neutral conductor. The energized second electromagnet generates a magnetic force capable of moving an armature that unlatches the latch releasing the spring to open the main contactor removing power from the electrical circuit.

Provided are a protection circuit and a photovoltaic system capable of irreversibly interrupting a current path of photovoltaic units such as solar cells by a signal in an emergency such as a fire. The protection circuit includes: a photovoltaic units 26, a protection element 2 provided on a current path of the photovoltaic units 26, and a switch 3 for activating the protection element 2, wherein the protection element 2 irreversibly interrupts the current path of the photovoltaic units 26.

A method for protecting an electronic system against a voltage surge, which electronic system is connected to a telecommunication network and includes a control integrated circuit, the method including successively connecting the electronic system to a remote server containing meteorological data; recovering meteorological data originating from the remote server; analyzing by the control circuit the recovered meteorological data to assign thereto a danger level of the current or imminent meteorological event; and, when the assigned danger level exceeds a main warning threshold: sending by the control circuit a warning signal to a display terminal connected to the electronic system; displaying a first warning message on the display terminal from information contained in the warning signal, the first warning message warning a user of the display terminal of a risk of voltage surge due to the current or imminent meteorological event; and electrical isolating a port of the electronic system.

A method for protecting an electronic system against a voltage surge, which electronic system is connected to a telecommunication network and includes a control integrated circuit, the method including successively connecting the electronic system to a remote server containing meteorological data; recovering meteorological data originating from the remote server; analyzing by the control circuit the recovered meteorological data to assign thereto a danger level of the current or imminent meteorological event; and, when the assigned danger level exceeds a main warning threshold: sending by the control circuit a warning signal to a display terminal connected to the electronic system; displaying a first warning message on the display terminal from information contained in the warning signal, the first warning message warning a user of the display terminal of a risk of voltage surge due to the current or imminent meteorological event; and electrical isolating a port of the electronic system.

Provided are a protection circuit and a photovoltaic system capable of irreversibly interrupting a current path of photovoltaic units such as solar cells by a signal in an emergency such as a fire. The protection circuit includes: a photovoltaic units 26, a protection element 2 provided on a current path of the photovoltaic units 26, and a switch 3 for activating the protection element 2, wherein the protection element 2 irreversibly interrupts the current path of the photovoltaic units 26.

An impact protection controller for an electric height-adjustable desk. The controller comprises an MCU, a motor drive circuit, a motor current sampling circuit, a current amplifier circuit, a Hall pulse generator, and a Hall filter. The MCU controls the motor drive circuit. A signal transmitted by the Hall pulse generator is sent to the MCU via the Hall filter. A motor current is sampled by the motor current sampling circuit, and the result is sent to the MCU via the current amplifier circuit to detect a change of the current. The controller further comprises a shock switch provided outside of and connected to the MCU, or provided inside of the MCU. The present invention combines current detection and shock detection to improve sensitivity and reliability of impact protection.

This application discloses a photovoltaic direct-current breaking apparatus, including a positive connection terminal and a negative connection terminal for connecting a photovoltaic string and a photovoltaic energy converter, a first diode, a first switch, a convector circuit, and an energy absorption circuit, where the first switch, the convector circuit, and the energy absorption circuit are connected in parallel. The convector circuit can effectively avoid arc discharge and ablation generated when the first switch cuts off a direct-current circuit between the photovoltaic string and the photovoltaic energy converter. The first diode can effectively bypass energy stored by an energy storage device in the photovoltaic energy converter, helping reduce required specifications of a semiconductor device in the convector circuit. The energy absorption circuit can also effectively reduce required specifications of the semiconductor device and a varistor.