A measuring circuit for determining the magnitude of a current flowing through a conductor, the measuring circuit having an input terminal pair that can be connected to the current transformer, with a first switch, which connects a measuring resistor between the input terminals in a current measuring position, and which, in a voltage measuring position, separates the measuring resistor from at least one of the input terminals, and having an output terminal pair, at which, alternatively, a voltage-dependent measuring voltage present at the input terminal pair or a current-dependent measuring voltage present at a first measuring point of the measuring resistor can be tapped. The invention also discloses a changeover switch which can be switched synchronously with the switch. The changeover switch is used to connect an output terminal to the first measuring point in the current measuring position, and to the second measuring point in the voltage measuring position.

A measuring circuit for determining the magnitude of a current flowing through a conductor, the measuring circuit having an input terminal pair that can be connected to the current transformer, with a first switch, which connects a measuring resistor between the input terminals in a current measuring position, and which, in a voltage measuring position, separates the measuring resistor from at least one of the input terminals, and having an output terminal pair, at which, alternatively, a voltage-dependent measuring voltage present at the input terminal pair or a current-dependent measuring voltage present at a first measuring point of the measuring resistor can be tapped. The invention also discloses a changeover switch which can be switched synchronously with the switch. The changeover switch is used to connect an output terminal to the first measuring point in the current measuring position, and to the second measuring point in the voltage measuring position.

Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for monitoring energy consumption. In one aspect, a method includes sending, to a power monitor of a circuit board, requests for power consumption data. The requests are sent periodically based on a reference clock that is located external to the circuit board and that is more accurate than a clock of the power monitor. Each request is for an accumulated amount of power for components of the circuit board. In response to each request, power consumption data is received from the power monitor. The power consumption data specifies the accumulated amount of power for the components of the circuit board since a previous request sent to the circuit board. An amount of energy consumed by the components of the circuit board over a time period is determined based on the received power measurements and the time period.

Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for monitoring energy consumption. In one aspect, a method includes sending, to a power monitor of a circuit board, requests for power consumption data. The requests are sent periodically based on a reference clock that is located external to the circuit board and that is more accurate than a clock of the power monitor. Each request is for an accumulated amount of power for components of the circuit board. In response to each request, power consumption data is received from the power monitor. The power consumption data specifies the accumulated amount of power for the components of the circuit board since a previous request sent to the circuit board. An amount of energy consumed by the components of the circuit board over a time period is determined based on the received power measurements and the time period.

A smart window and a controller thereof, a power detection method and a non-transitory computer-readable storage medium are provided. The controller includes: a microcontroller; an output circuit coupled to the microcontroller and configured to output a driving signal under a control of the microcontroller; a first power supply coupled to a load through the output circuit and configured to supply an operating power supply to the load; a sampling resistor between the output circuit and the first power supply, a first terminal of the sampling resistor being coupled to the first power supply, and the second terminal of the sampling resistor being coupled to the output circuit; and a power acquiring circuit coupled to the microcontroller and coupled to the first terminal and the second terminal of the sampling resistor, respectively.

A smart window and a controller thereof, a power detection method and a non-transitory computer-readable storage medium are provided. The controller includes: a microcontroller; an output circuit coupled to the microcontroller and configured to output a driving signal under a control of the microcontroller; a first power supply coupled to a load through the output circuit and configured to supply an operating power supply to the load; a sampling resistor between the output circuit and the first power supply, a first terminal of the sampling resistor being coupled to the first power supply, and the second terminal of the sampling resistor being coupled to the output circuit; and a power acquiring circuit coupled to the microcontroller and coupled to the first terminal and the second terminal of the sampling resistor, respectively.

In response to a problem wherein a voltage of a capacitor of a power conversion device decreases when a voltage of an alternating current power supply is restored after once decreasing, the voltage of the capacitor drops below a maximum value of the voltage of the alternating current power supply when power is restored, and an inrush current occurs, the power conversion device, provided between an alternating current power supply and a load, is such that a decrease in an input voltage or an input current of a power converting unit is detected, a change in the voltage of the capacitor is predicted, and operations of the power converting unit are caused to stop before the voltage of the capacitor drops to or below the maximum value of the voltage of the alternating current power supply, thereby restricting an occurrence of an inrush current.

Improved power line management is provided by the systems and methods disclosed herein that accurately measures voltage in a power distribution system. In various embodiments, the system may include one or more sensor units, each coupled to the power lines using a capacitive or resistive voltage divider to yield a voltage at a sensor unit that is within a measurable range. In one aspect, this voltage may also be used to power the sensor unit and/or other devices coupled to it.

Improved power line management is provided by the systems and methods disclosed herein that accurately measures voltage in a power distribution system. In various embodiments, the system may include one or more sensor units, each coupled to the power lines using a capacitive or resistive voltage divider to yield a voltage at a sensor unit that is within a measurable range. In one aspect, this voltage may also be used to power the sensor unit and/or other devices coupled to it.

A device for self-adjusting an electrical threshold includes a framing unit that compares a setpoint signal representative of the supply signal to a plurality of successive intervals of reference signals that increase in value according to a geometric sequence. The framing unit generates an output based on the interval bounding the setpoint signal, wherein the output controls a switch that is configured to provide one of the plurality of reference signals as an output, wherein the output reference signal is representative of the electrical detection threshold.