According to an embodiment, there is provided an amplifier circuit including a first capacitive element, a first GM amplifier, and a second GM amplifier. The first GM amplifier includes a first input node, a second input node, and an output node. The output node is connected to one end of the first capacitive element. The second GM amplifier includes a first input node, a second input node, and an output node. The output node is connected to one end of the first capacitive element and the second input node.

According to an embodiment, there is provided an amplifier circuit including a first capacitive element, a first GM amplifier, and a second GM amplifier. The first GM amplifier includes a first input node, a second input node, and an output node. The output node is connected to one end of the first capacitive element. The second GM amplifier includes a first input node, a second input node, and an output node. The output node is connected to one end of the first capacitive element and the second input node.

This application provides a current measurement circuit including: an amplification unit, configured to amplify an electrical signal from the sensor unit; a comparison unit, configured to obtain an initial pulse signal based on a voltage signal output by the amplification unit and a preset voltage; a delay unit, electrically connected to the comparison unit and configured to delay an output of the initial pulse signal to obtain a target pulse signal; a resistance unit, wherein two terminals of the resistance unit are electrically connected to an input terminal of the amplification unit and an output terminal of the delay unit respectively, and the resistance unit is configured to charge and discharge the amplification unit based on the target pulse signal; and a calculation unit, electrically connected to the delay unit and configured to calculate a target current based on the target pulse signal output by the delay unit.

This application provides a current measurement circuit including: an amplification unit, configured to amplify an electrical signal from the sensor unit; a comparison unit, configured to obtain an initial pulse signal based on a voltage signal output by the amplification unit and a preset voltage; a delay unit, electrically connected to the comparison unit and configured to delay an output of the initial pulse signal to obtain a target pulse signal; a resistance unit, wherein two terminals of the resistance unit are electrically connected to an input terminal of the amplification unit and an output terminal of the delay unit respectively, and the resistance unit is configured to charge and discharge the amplification unit based on the target pulse signal; and a calculation unit, electrically connected to the delay unit and configured to calculate a target current based on the target pulse signal output by the delay unit.

Load current consumption measured using a first resistor having a high resistive value and a second resistor having a low resistive value. Differential amplifiers, the outputs of which are coupled to analog-to-digital converters and to a processing circuit unit, are connected to each of the nodes of the resistors. Depending on the current level, the processing circuit unit advantageously selects one of the analog-to-digital converters to estimate the present consumption of current in the load. Each input terminal of a resistor is advantageously power supplied from a power amplifier and each power amplifier is advantageously driven by a control loop. For low load currents, the first amplifier associated with the first resistor power supplies the load through the resistors while, for high load currents, when this first amplifier saturates, the second amplifier associated with the second resistor, takes over from the first amplifier to continue to power supply the load.

An indicator light circuit configured for a micro-current comprises an indicator light module, a logic controller, and a sampling circuit. The logic controller is configured to compare a sample voltage generated by the micro-current on the sampling circuit with a first preset threshold voltage. When the sample voltage is greater than the first preset threshold voltage, the logic controller outputs a control signal to the indicator light module to drive an indicator light of the indicator light module to be turned on.

An indicator light circuit configured for a micro-current comprises an indicator light module, a logic controller, and a sampling circuit. The logic controller is configured to compare a sample voltage generated by the micro-current on the sampling circuit with a first preset threshold voltage. When the sample voltage is greater than the first preset threshold voltage, the logic controller outputs a control signal to the indicator light module to drive an indicator light of the indicator light module to be turned on.

A current sensing topology uses an amplifier with capacitively coupled inputs in feedback to sense the input offset of the amplifier, which can be compensated for during measurement. The amplifier with capacitively coupled inputs in feedback is used to: operate the amplifier in a region where the input common-mode specifications are relaxed, so that the feedback loop gain and/or bandwidth is higher; operate the sensor from the converter input voltage by employing high-PSRR (power supply rejection ratio) regulators to create a local, clean supply voltage, causing less disruption to the power grid in the switch area; sample the difference between the input voltage and the controller supply, and recreate that between the drain voltages of the power and replica switches; and compensate for power delivery network related (PDN-related) changes in the input voltage during current sensing.

A current sensing topology uses an amplifier with capacitively coupled inputs in feedback to sense the input offset of the amplifier, which can be compensated for during measurement. The amplifier with capacitively coupled inputs in feedback is used to: operate the amplifier in a region where the input common-mode specifications are relaxed, so that the feedback loop gain and/or bandwidth is higher; operate the sensor from the converter input voltage by employing high-PSRR (power supply rejection ratio) regulators to create a local, clean supply voltage, causing less disruption to the power grid in the switch area; sample the difference between the input voltage and the controller supply, and recreate that between the drain voltages of the power and replica switches; and compensate for power delivery network related (PDN-related) changes in the input voltage during current sensing.

A method of calibrating a recloser voltage measurement system. In one example, the recloser voltage measurement system includes a voltage divider and a voltage adjustment circuit. The voltage divider is electrically coupled to a recloser. The voltage adjustment circuit is electrically coupled to an output of the voltage divider. The method includes determining a first voltage measurement at a high voltage input to the recloser. The method also includes determining a second voltage measurement at an output of the voltage adjustment circuit. The method further includes calculating a difference between the first voltage measurement and the second voltage measurement. The method also includes determining a target voltage gain based on the determined difference between the first voltage measurement and the second voltage measurement. The method further includes adjusting a voltage ratio of the voltage divider by setting the voltage adjustment circuit to the target voltage gain.