The invention relates to a circuit arrangement for combined protection of a load from temporary and transient overvoltages with emergency operation of the load in the presence of a temporary overvoltage and with integrated follow current limitation, wherein a first surge arrester, in particular a spark gap or a varistor, is provided between network-side input terminals and a second surge arrester, in particular a varistor, is provided between load-side output terminals for follow current limitation. According to the invention, at least one controlled semiconductor switch is provided in each case in the series branch between the input terminal and the output terminal and in the output-side parallel branch, wherein a mechanical switch and a series capacitance are connected in parallel with the semiconductor switch in the series branch. Furthermore, the semiconductor switch in the parallel branch is part of a series circuit comprising a parallel circuit comprising a second surge arrester and a parallel capacitance. A series inductance is provided in the series branch between the input terminal and the parallel circuit comprising the series capacitance, the controlled semiconductor switch and the mechanical switch. A microcontroller for controlling the semiconductor switches is also present, wherein the microcontroller is connected to a current detector in the series branch.

The invention relates to a circuit arrangement for combined protection of a load from temporary and transient overvoltages with emergency operation of the load in the presence of a temporary overvoltage and with integrated follow current limitation, wherein a first surge arrester, in particular a spark gap or a varistor, is provided between network-side input terminals and a second surge arrester, in particular a varistor, is provided between load-side output terminals for follow current limitation. According to the invention, at least one controlled semiconductor switch is provided in each case in the series branch between the input terminal and the output terminal and in the output-side parallel branch, wherein a mechanical switch and a series capacitance are connected in parallel with the semiconductor switch in the series branch. Furthermore, the semiconductor switch in the parallel branch is part of a series circuit comprising a parallel circuit comprising a second surge arrester and a parallel capacitance. A series inductance is provided in the series branch between the input terminal and the parallel circuit comprising the series capacitance, the controlled semiconductor switch and the mechanical switch. A microcontroller for controlling the semiconductor switches is also present, wherein the microcontroller is connected to a current detector in the series branch.

A device for detecting stray electrical currents in fluid mediums comprises at least two probes for partially disposing in a fluid medium and a control unit. The control unit comprises at least one analog-to-digital signal converter in electrical communication with at least one of the probes, at least one audio-visual alarm, and a processor operably coupled to the at least one converter and to the at least one audio-visual alarm. The processor is operable to measure an electrical potential difference between the two probes, to analyze a plurality of the measurements to determine whether a predetermined frequency is present, and to transmit an alert signal to the audio-visual alarm if the predetermined frequency is present. Advantageously, by monitoring for the frequency, the device more consistently and more reliably detects the presence of stray alternating currents.

A device for detecting stray electrical currents in fluid mediums comprises at least two probes for partially disposing in a fluid medium and a control unit. The control unit comprises at least one analog-to-digital signal converter in electrical communication with at least one of the probes, at least one audio-visual alarm, and a processor operably coupled to the at least one converter and to the at least one audio-visual alarm. The processor is operable to measure an electrical potential difference between the two probes, to analyze a plurality of the measurements to determine whether a predetermined frequency is present, and to transmit an alert signal to the audio-visual alarm if the predetermined frequency is present. Advantageously, by monitoring for the frequency, the device more consistently and more reliably detects the presence of stray alternating currents.

The present application provides a sensor, relates to sensing technology field, the sensor includes a sensor body, a main circuit module disposed in the sensor body and an sensing assembly electrically connect to the main circuit module, and further includes a circuit protection module disposed at outside of the sensor body and electrically connected to the main circuit module. In the present application, the main circuit module and the sensing assembly are used as the core components to achieve the functions of sensing and information conversion of the sensor; the circuit protection module is disposed outside the sensor body to realize the circuit protection function of the sensor. Specifically, the sensor can pass the test of the lightning surge test standard IEC61000-4-5 surge, and can also protect from static electricity of a high level and the impact of the electric fast transient pulse group; in addition, since the circuit protection module is disposed outside of the sensor body and the inner volume of the sensor is not occupied, such that the circuit protection performance of the sensor is further optimized and improved without any change on the inherent structure of the sensor body.

The present application provides a sensor, relates to sensing technology field, the sensor includes a sensor body, a main circuit module disposed in the sensor body and an sensing assembly electrically connect to the main circuit module, and further includes a circuit protection module disposed at outside of the sensor body and electrically connected to the main circuit module. In the present application, the main circuit module and the sensing assembly are used as the core components to achieve the functions of sensing and information conversion of the sensor; the circuit protection module is disposed outside the sensor body to realize the circuit protection function of the sensor. Specifically, the sensor can pass the test of the lightning surge test standard IEC61000-4-5 surge, and can also protect from static electricity of a high level and the impact of the electric fast transient pulse group; in addition, since the circuit protection module is disposed outside of the sensor body and the inner volume of the sensor is not occupied, such that the circuit protection performance of the sensor is further optimized and improved without any change on the inherent structure of the sensor body.

A pest control system for tracking and locating the nest of the pest to improve the efficiency of pest control. The pest control system comprising a detector for detecting pests which have consumed a conducting tracking material; the detector comprising a sensing head comprising an electrical conductance loop; and a pest sensing circuit configured to sense the electrical continuity of the presence of the conducting tracking material to generate a first pest signal and comprising at least one indicator configured to indicate the first pest signal received from the sensing head. The pest control system also comprises a sensor probe comprising a body configured for inserting into a substrate to indicate the presence of a pest colony; and at least one sensor electrically connected to the pest sensing circuit and configured to generate a second pest signal to be indicated on the at least one indicator.

A pest control system for tracking and locating the nest of the pest to improve the efficiency of pest control. The pest control system comprising a detector for detecting pests which have consumed a conducting tracking material; the detector comprising a sensing head comprising an electrical conductance loop; and a pest sensing circuit configured to sense the electrical continuity of the presence of the conducting tracking material to generate a first pest signal and comprising at least one indicator configured to indicate the first pest signal received from the sensing head. The pest control system also comprises a sensor probe comprising a body configured for inserting into a substrate to indicate the presence of a pest colony; and at least one sensor electrically connected to the pest sensing circuit and configured to generate a second pest signal to be indicated on the at least one indicator.

An integrated circuit includes a semiconductor die having conductive pads and an electronic component with a first terminal coupled to a third conductive pad and a second terminal coupled to a fourth conductive pad. A resistor has a first terminal coupled to the fourth conductive pad and a second terminal coupled to the fifth conductive pad, and a first transistor has a first terminal coupled to the first conductive pad, a second terminal coupled to the fifth conductive pad, and a control terminal. A second transistor has a first terminal coupled to the first transistor, a second terminal coupled to the third conductive pad, and a control terminal. A pulse generator has an input coupled to the second conductive pad and an output coupled to the control terminal of the second transistor.

An integrated circuit includes a semiconductor die having conductive pads and an electronic component with a first terminal coupled to a third conductive pad and a second terminal coupled to a fourth conductive pad. A resistor has a first terminal coupled to the fourth conductive pad and a second terminal coupled to the fifth conductive pad, and a first transistor has a first terminal coupled to the first conductive pad, a second terminal coupled to the fifth conductive pad, and a control terminal. A second transistor has a first terminal coupled to the first transistor, a second terminal coupled to the third conductive pad, and a control terminal. A pulse generator has an input coupled to the second conductive pad and an output coupled to the control terminal of the second transistor.