The present application relates to current sensing circuitry (100) that comprises a differential amplifier (110) comprising first and second inputs configured to sense a current across a sense resistance, and an output configured to output a current sense signal. The circuitry (100) further comprises a first current source, a second current source and a switch network operable in: a first phase in which the first current source is connected to the first input and disconnected from the output, and the second current source is connected to the output and disconnected from the first input; and a second phase in which the first current source is connected to the output and disconnected from the first input, and the second current source is connected to the first input and disconnected from the output.

A semiconductor device includes an analog-digital conversion circuit that converts a voltage at a node between a reference resistor and a sensor resistor into output data, the reference resistor and the sensor resistor being connected in series. The semiconductor device calculates a resistance value of the sensor resistor using a first output data obtained in a first conversion phase and second output data obtained in a second conversion phase. In the first conversion phase, a high potential side voltage is applied to one end of the reference resistor and a low potential side voltage is applied to one end of the sensor resistor. In the second conversion phase, the low potential side voltage is applied to one end of the reference resistor and the high potential side voltage is applied to one end of the sensor resistor.

A switching circuit comprising a transistor (23) and a drive component both for controlling the transistor and also for limiting the power supply current (Ia) suppled to a load (22), the drive component being arranged both to receive a control voltage (V.sub.H) and also: when the control voltage (VH) is disconnection signal, to generate a drive voltage (V.sub.P) that causes the transistor to occupy a non-conductive state; when the control voltage (VH) is a connection signal and the power supply current (Ia) cannot reach a predefined current threshold, to generate drive voltage (V.sub.P) that causes the transistor to occupy saturated conditions; and when the control voltage (VH) is a connection signal and the power supply current (Ia) can reach a predefined current threshold, to generate a drive voltage (V.sub.P) that causes the transistor to occupy linear conditions, such that the power supply current is regulated so that it does not exceed the predefined current threshold.

A switching circuit comprising a transistor (23) and a drive component both for controlling the transistor and also for limiting the power supply current (Ia) suppled to a load (22), the drive component being arranged both to receive a control voltage (V.sub.H) and also: when the control voltage (VH) is disconnection signal, to generate a drive voltage (V.sub.P) that causes the transistor to occupy a non-conductive state; when the control voltage (VH) is a connection signal and the power supply current (Ia) cannot reach a predefined current threshold, to generate drive voltage (V.sub.P) that causes the transistor to occupy saturated conditions; and when the control voltage (VH) is a connection signal and the power supply current (Ia) can reach a predefined current threshold, to generate a drive voltage (V.sub.P) that causes the transistor to occupy linear conditions, such that the power supply current is regulated so that it does not exceed the predefined current threshold.

A current detection system, a current detection method, and a detection apparatus are provided. The current detection system includes a printed circuit board and N groups of amplification apparatuses, wherein N is a positive integer greater than or equal to 1. Each group includes at least one amplification apparatus. N Rogowski coils are mounted on the printed circuit board. The n.sup.th Rogowski coil is capable of being mounted concentric with the n.sup.th current-carrying conductor in N current-carrying conductors, which is perpendicular to a plane of the n.sup.th Rogowski coil. An output end of the n.sup.th Rogowski coil is connected to an input end of the first amplification apparatus in the n.sup.th group of the N groups of amplification apparatuses. The foregoing current detection system provides more convenience when being integrated into different electrical equipment, in particular when each group of amplification apparatus includes multiple amplification apparatuses.

A current detection system, a current detection method, and a detection apparatus are provided. The current detection system includes a printed circuit board and N groups of amplification apparatuses, wherein N is a positive integer greater than or equal to 1. Each group includes at least one amplification apparatus. N Rogowski coils are mounted on the printed circuit board. The n.sup.th Rogowski coil is capable of being mounted concentric with the n.sup.th current-carrying conductor in N current-carrying conductors, which is perpendicular to a plane of the n.sup.th Rogowski coil. An output end of the n.sup.th Rogowski coil is connected to an input end of the first amplification apparatus in the n.sup.th group of the N groups of amplification apparatuses. The foregoing current detection system provides more convenience when being integrated into different electrical equipment, in particular when each group of amplification apparatus includes multiple amplification apparatuses.

A readout circuit for resistive and capacitive sensors includes a first input coupled to a reference resistor in a first mode of operation and coupled to a resistive sensor in a second mode of operation; a second input coupled to a capacitive sensor in the first mode of operation and coupled to a reference capacitor in the second mode of operation; and an output for providing a capacitive sensor data stream in the first mode of operation and for providing a resistive sensor data stream in the second mode of operation.

A readout circuit for resistive and capacitive sensors includes a first input coupled to a reference resistor in a first mode of operation and coupled to a resistive sensor in a second mode of operation; a second input coupled to a capacitive sensor in the first mode of operation and coupled to a reference capacitor in the second mode of operation; and an output for providing a capacitive sensor data stream in the first mode of operation and for providing a resistive sensor data stream in the second mode of operation.

A readout circuit for resistive and capacitive sensors includes a first input coupled to a reference resistor in a first mode of operation and coupled to a resistive sensor in a second mode of operation; a second input coupled to a capacitive sensor in the first mode of operation and coupled to a reference capacitor in the second mode of operation; and an output for providing a capacitive sensor data stream in the first mode of operation and for providing a resistive sensor data stream in the second mode of operation.

A readout circuit for resistive and capacitive sensors includes a first input coupled to a reference resistor in a first mode of operation and coupled to a resistive sensor in a second mode of operation; a second input coupled to a capacitive sensor in the first mode of operation and coupled to a reference capacitor in the second mode of operation; and an output for providing a capacitive sensor data stream in the first mode of operation and for providing a resistive sensor data stream in the second mode of operation.