A technique for managing undervoltage in a compute system is disclosed. The technique includes a method that further includes: detecting an AC undervoltage condition in the compute system; and upon detecting the AC undervoltage condition: dynamically determining a holdup time as a function of the present load; determining a monitoring period as a function of the dynamically determined holdup time; waiting for the determined monitoring period to expire; and upon expiration of the determined monitoring period, perform a shutdown process if the AC undervoltage condition persists.

A protection circuit and method for protecting driven circuitry against voltage peaks in a radio frequency signal, “V.sub.RF”, past a predetermined voltage level “V.sub.detect”. The protection circuit includes an input for receiving the radio frequency signal. The protection circuit also includes at least one amplification stage coupled to the input. The amplification stage is operable to produce an amplified signal based on V.sub.detect−V.sub.RF. The protection circuit further includes a hold circuit operable to determine, from the amplified signal produced by the amplification stage, whether a peak voltage V.sub.peak of the radio frequency signal exceeds V.sub.detect. The hold circuit is operable to output a first detection value if V.sub.peak exceeds V.sub.detect. The hold circuit is operable to output a second detection value if V.sub.peak does not exceed V.sub.detect. The protection circuit also includes a latch circuit operable to latch the detection value outputted by the hold circuit.

The present technology relates to a signal processing apparatus, a control method, an image pickup element, and an electronic appliance that achieve the suppression of an increase in electric power consumption. The signal processing apparatus may be configured to control an amount of electric current at a differential stage in a comparison unit that compares signal levels of a plurality of signals and reduce the amount of electric current for a period other than this comparison period. For example, the amount of electric current may be reduced by turning off part of a group of switches each capable of disconnecting a path of an electric current from an electric current source. In addition, for example, the amount of electric current may be reduced by causing a gate potential at the electric current source unit to decrease. The present technology can be applied to, for example, an image pickup element and an electronic appliance.

The present invention relates to a supply voltage detection device (1), in particular for at least one load, for monitoring a rectified mains voltage of a mains voltage supply (2) and for comparing a detected mains voltage value with a predetermined reference value, wherein, if the detected mains voltage value is lower than the reference value, switching to e.g. an emergency voltage of an emergency voltage supply can be effected by means of an electronic control system (3). In addition, if a voltage limit value has been exceeded, the rectified mains voltage can be fed to an optocoupler (4) and a signal can be transmitted by said optocoupler for the duration of this excess, a duty factor that is dependent on the mains voltage value being determinable from the duration and the period of said signal.

System, apparatus and methods are provided for identifying a phase loss condition in a motor drive. In one example, a power conversion system includes an active rectifier, a switching inverter, and a controller. The controller is operative to generate rectifier switching control signals to operate the rectifier, measure AC input voltage signals and determine grid current signals. If the rectifier circuit is not in a switching mode, the controller identifies a suspected AC input phase loss condition if two of the AC input voltage signals are in phase with one another. If the rectifier is in the switching mode, the controller identifies a suspected AC input phase loss condition if the absolute value of the sum of two of the grid current signals is less than a predetermined non-zero threshold.

The invention relates to an interference suppressor for a direct current circuit, a vehicle component, a high-voltage intermediate circuit and a vehicle. The interference suppressor for a direct current circuit, which comprises two conductors, is characterized in that the interference suppressor comprises a first connection for connecting the interference suppressor to a first conductor of the direct current circuit; a second connection for connecting the interference suppressor to a second conductor of the direct current circuit; a sensor, wherein the sensor can be coupled in noncontact manner to the direct current circuit and is designed to detect the passing of a predetermined limit value of a superimposed alternating voltage in the first conductor of the direct current circuit; and is designed, by impressing a current in the first connection, to reduce the alternating voltage in the first conductor of the direct current circuit substantially to the predetermined limit value.

A voltage monitoring device 2 includes: a comparator circuit 31; a state determination circuit 32; a pulse pattern setting circuit 33; an output circuit 36; a VDD port 21; a VSS port 22; an input port 24; and an output port 23. The comparator circuit 31 is connected to the state determination circuit 32. The state determination circuit 32 is connected to the pulse pattern setting circuit 33. The pulse pattern setting circuit is connected to the output port 23 via the output circuit 36.

Techniques for synchronizing acquisition of image data by cameras in a multi-camera system using a waveform associated with an AC power supply for the cameras. Each camera in the multi-camera system may receive power from the AC power supply provided using an AC voltage signal. Further, each camera may be configured to identify predefined voltages on a waveform of the AC voltage signal. By detecting the predefined voltage on the waveform of the AC voltage signal, the cameras may be synchronized according to a frequency of the AC voltage signal. The cameras may be configured to synchronize acquisition of image data from respective imaging sensors based on the frequency of the AC voltage signal. In this way, the cameras of the multi-camera system may be synchronized using an AC power signal delivered through wires that are used to deliver power to the multiple cameras.

The present specification relates to a power grid electric transient detector, a method of detecting a power grid electric transient, and an electric provisioning system detecting the power grid electric load. The power grid electric transient is estimated by receiving an electric parameter for electricity received from a power grid at a consuming facility. A digital filter extracts transient of the electric parameter. A processor analyzes the transients of the electric parameter and generates a power grid performance index based on the analyzed transient of the electric parameter.

A method of operating a relaxation oscillator includes determining a measure of a propagation delay of a detection device of a relaxation oscillator and increasing a charging rate of a capacitor device of the relaxation oscillator for a time duration based on the determined measure of the propagation delay.