Methods and apparatus for non-intrusive monitoring by sensing physical parameters such as electric and/or magnetic fields. Such apparatus and techniques may find application in a variety of fields, such as monitoring consumption of electricity, for example.

A measuring system for measuring a high frequency signal is provided. The measuring system comprises an antenna module, adapted for receiving the high frequency signal. Moreover, the system comprises a detector module adapted for deriving a measuring signal from the high frequency signal. Finally, the system comprises a sensor module adapted for measuring the measuring signal. The sensor module is arranged in a housing, while the detector module is not arranged in the housing. The detector module is connected to the sensor module by a first cable, which is adapted to transmit the measuring signal from the detector module to the sensor module.

A power conversion device includes a power conversion circuit including a temperature sensor configured to detect a temperature at a sensor position and a switch configured to switch a connection on and off at a switch position separated from the sensor position; a loss calculation processing circuitry configured to calculate a power loss in the switch; a loss correction processing circuitry configured to correct a calculation result of the power loss on the basis of a detection result of the temperature at the sensor position; a temperature correction processing circuitry configured to correct the detection result of the temperature on the basis of the calculation result of the power loss; and a temperature estimation processing circuitry configured to estimate a temperature at the switch position on the basis of a corrected calculation result of the power loss and a corrected detection result of the temperature.

A power conversion device includes a power conversion circuit including a temperature sensor configured to detect a temperature at a sensor position and a switch configured to switch a connection on and off at a switch position separated from the sensor position; a loss calculation processing circuitry configured to calculate a power loss in the switch; a loss correction processing circuitry configured to correct a calculation result of the power loss on the basis of a detection result of the temperature at the sensor position; a temperature correction processing circuitry configured to correct the detection result of the temperature on the basis of the calculation result of the power loss; and a temperature estimation processing circuitry configured to estimate a temperature at the switch position on the basis of a corrected calculation result of the power loss and a corrected detection result of the temperature.

A remote radio frequency (RF) power sensing unit includes a first module and a second module. The first module may be configured to generate an analog signal representative of a power level of a radio frequency (RF) signal. The second module may be configured to (i) receive a particular frequency of a plurality of frequencies over a wireless communication channel from a device, (ii) generate a value conveying a magnitude of said power level of said RF signal in response to said analog signal, (iii) convert said value into a digital signal communicating said power level based on said particular frequency indexed into a table, and (iv) transmit said digital signal communicating said power level and information identifying said radio frequency power sensing unit over said wireless communication channel to said device.

A remote radio frequency (RF) power sensing unit includes a first module and a second module. The first module may be configured to generate an analog signal representative of a power level of a radio frequency (RF) signal. The second module may be configured to (i) receive a particular frequency of a plurality of frequencies over a wireless communication channel from a device, (ii) generate a value conveying a magnitude of said power level of said RF signal in response to said analog signal, (iii) convert said value into a digital signal communicating said power level based on said particular frequency indexed into a table, and (iv) transmit said digital signal communicating said power level and information identifying said radio frequency power sensing unit over said wireless communication channel to said device.

In some embodiments, a compensated power detector can include a power detector that includes a first detection cell having a bias input and an output, and a second detection cell having a signal input, a bias input and an output. The power detector can further include an error amplifier having a first input coupled to the output of the first detection cell, and a second input for receiving a reference voltage. The error amplifier can be configured to provide an output voltage to each of the bias inputs of the first and second detection cells, such that an output of the second detection cell is representative of power of a radio-frequency signal received at the signal input with an adjustment for one or more non-signal effects as measured by the first detection cell and the error amplifier.

In some embodiments, a compensated power detector can include a power detector that includes a first detection cell having a bias input and an output, and a second detection cell having a signal input, a bias input and an output. The power detector can further include an error amplifier having a first input coupled to the output of the first detection cell, and a second input for receiving a reference voltage. The error amplifier can be configured to provide an output voltage to each of the bias inputs of the first and second detection cells, such that an output of the second detection cell is representative of power of a radio-frequency signal received at the signal input with an adjustment for one or more non-signal effects as measured by the first detection cell and the error amplifier.

A measurement circuit for monitoring at least one parameter of an input signal received from an external signal source includes at least one first measurement element coupled to the input signal and configured to provide an initial measurement signal indicative of a respective one or more of the at least one parameter of the input signal. An analog to digital converter is coupled to receive a signal indicative of the analog output signal and a reference voltage and configured to generate a digital output signal representative of the analog output signal. A compensation circuit is responsive to an output of at least one second measurement element and to a reference signal to generate a compensation signal indicative of a difference between the output of the at least one second measurement element and the reference signal. A voltage level of the reference voltage is adjusted in response to the compensation signal.

A measurement circuit for monitoring at least one parameter of an input signal received from an external signal source includes at least one first measurement element coupled to the input signal and configured to provide an initial measurement signal indicative of a respective one or more of the at least one parameter of the input signal. An analog to digital converter is coupled to receive a signal indicative of the analog output signal and a reference voltage and configured to generate a digital output signal representative of the analog output signal. A compensation circuit is responsive to an output of at least one second measurement element and to a reference signal to generate a compensation signal indicative of a difference between the output of the at least one second measurement element and the reference signal. A voltage level of the reference voltage is adjusted in response to the compensation signal.