A power converter to be tested is supplied with arm current from a hysteresis converter in a state in which it is connected to an auxiliary converter through a line. In the power converter and the auxiliary converter, a circulation operation is performed in which a current path bypassing power storage elements is formed between an output terminal of the power converter and an output terminal of the auxiliary converter, after the start of output of arm current in accordance with a reference current command value in which an AC component and a DC component are superimposed, until a DC component of arm current reaches a predetermined level. After execution of the circulation operation, in the power converter and the auxiliary converter, voltage control of the power storage elements and the output terminals is started.

A control circuit and an AC-DC power supply are provided. A ripple reference signal characterizing an industrial frequency ripple component of an output voltage is added to a reference voltage of a desired output voltage, so that a reference and a feedback voltage of the output voltage are almost the same at the industrial frequency band. In addition, a voltage compensation signal outputted by an error compensation circuit does not include the industrial frequency ripple component, and the voltage compensation signal without the industrial frequency ripple component does not affect a tracking reference of the current loop. Therefore, the loop can be designed without considering limit of the industrial frequency on a cut-off frequency of the loop, thereby effectively increasing the cut-off frequency of the loop and improving a dynamic response speed of the loop.

A power converter is configured to measure an output current and to determine a multi-phase voltage reference as a function of the output current. Within the same switching period the voltage reference is determined, a modulation routine determines a modulation index for each phase of the output voltage. In some instances, one or more phases must start modulation during the switching period before the new modulation index is determined. The modulation routine stores the value of the modulation index generated from the prior switching period and uses the stored value when a new value is not yet ready. An offset value for the phase voltage which used a modulation index from the prior switching period is determined in order to compensate the phase voltages of the other phases and to maintain a desired line-to-line voltage output from the power converter.

An LLC resonant converter comprises, an LLC resonant converter circuit with an output line and an input line. The LLC resonant converter circuit includes a switch array operatively connecting between the input line and the output line. A controller is connected to the input line by a feed forward line and connected to a respective gate of each switch in the switch array. The controller includes machine readable instructions configured to cause the controller to receive feed forward input from the input line and control switching of the switch array with a pulse frequency modulation (PFM) switching pattern to regulate voltage of the output line.

A feedback loop circuit of a voltage regulator includes a loadline and a compensation circuit. The loadline generates a feedback signal according to a sensed current signal that provides information of an inductor current of the voltage regulator, and outputs the feedback signal to a controller circuit of the voltage regulator for regulating an output voltage of the voltage regulator. The compensation circuit generates a compensation signal to compensate for a deviation of the output voltage, wherein the feedback signal generated from the loadline is affected by the compensation signal.

A power converter for detecting oscillation of an output voltage including a switching regulator configured to perform switching so that an inductor is alternatively connected to or isolated from an external power voltage and generate the output voltage by a current that flows through the inductor and an oscillation detector configured to detect oscillation that occurs in the output voltage and output an oscillation detection signal by determining whether the oscillation belongs to an oscillation frequency detection range to be detected by the oscillation detector may be provided.

This power conversion device has: a main breaker and a main electromagnetic contactor connected to a main power supply; a converter body having a switching element; a power supply-side reactor and a device body-side reactor connected to the main electromagnetic contactor; a current detector; a smoothing capacitor; a DC voltage detector that detects a voltage of the smoothing capacitor; a control unit; and accessories. The accessories have: a power-supply phase detection transformer that detects the phase and the amplitude of a power supply voltage; a current limiting resistor that suppresses rush current to the smoothing capacitor at an initial turning-on stage of the main power supply; an electromagnetic contactor which is for turning on current limiting operation and which connects the current limiting resistor and the main power supply; and a filter circuit that removes current ripples caused by switching of the switching element. The main breaker, the main electromagnetic contactor, and an input terminal of the power-supply phase detection transformer in the accessories are connected to one another. The power supply-side reactor, the device body-side reactor, and a filter terminal in the accessories are connected to one another.

The present application provides a controller for a switching power supply such as a DC-DC converter which provides an output voltage and an output current. The controller is configured to provide at least one control signal to operate the switching power supply to maintain the output voltage at a first reference voltage. The controller employs a load line compensator responsive to output current for adjusting the reference voltage employed by the compensator. The load line compensator employs one or either or both of a high pass filter or saturating element to provide a filtered/saturated value which is the value employed in adjusting the reference voltage.

Example implementations include a method of obtaining an input voltage of a power converter circuit and a system voltage of the power converter circuit, obtaining a voltage rate gain based on an aggregate inductance of the power converter circuit, and in accordance with a determination that the input voltage and the system voltage are not equal, generating a rate offset voltage based on the voltage rate gain and the system voltage difference. Example implementations also include a device with a rate predictor device operatively coupled to an input voltage node and a system voltage node, and configured to obtain an input voltage of a power converter circuit and a system voltage of the power converter circuit, configured to obtain a voltage rate gain based on an aggregate inductance of the power converter circuit, and configured to, in accordance with a determination that the input voltage and the system voltage are not equal, generate a rate offset voltage based on the voltage rate gain and the system voltage difference.

A constant power control circuit driving an external device receiving an input voltage and generating an output voltage is provided. A first conversion circuit converts the voltage difference between the input voltage and the output voltage to generate a charge current. An energy storage circuit is charged during a charging period by the charge current to provide a stored voltage. The charging period is terminated in response to the stored voltage reaching a predetermined voltage. A control circuit adjusts a control signal according to a length of the charging period. A second conversion circuit generates a counting voltage according to the control signal. The counting voltage is inversely proportional to the voltage difference. A third conversion circuit converts the counting voltage into a limitation current. A driving circuit compares the setting current and the limitation current to generate a driving signal and send it to the external device.