Power conversion device for supplying a load with a PWM signal, comprising an inductive filter having at least an output configured to be connected to the load, the device comprising: a power conversion module supplied by an input voltage and configured for providing a plurality of output signals wherein one of the plurality of output signals is supplied to the filter; a conversion ratio control stage coupled to the power conversion module; and a controller configured to: determine a requested conversion ratio based on the input voltage and a target reference voltage; and based on the requested conversion ratio, control the conversion ratio control stage to operate in either a first operating mode, whereby the power conversion module provides the output signals in accordance with a first conversion ratio, or a second operating mode, whereby the power conversion module provides the output signals in accordance with a second conversion ratio.

A high voltage direct current power transmission series valve group control device, is used for regulating a series circuit having two or more valve groups provided with controllable power semiconductors respectively. Each valve group is provided with a current regulation unit and a voltage regulation unit. The current regulation unit controls a direct current current flowing through a valve group corresponding thereto, and the voltage regulation unit controls a voltage across two ends of a valve group corresponding thereto. One valve group is selected from the series valve group as a master control valve group, while the others are taken as slave control valve groups. The master control valve group selects a trigger angle output by the current regulation unit to control same, and the slave control valve group selects a trigger angle obtained after the trigger angle transmitted from the master control valve group and an output value of the voltage regulation unit pass through a subtractor to control same.

A first offset voltage which is added to voltage commands in a first three-phase voltage command calculated on the basis of a control command for an AC rotary machine, and a second offset voltage which is added to voltage commands in a second three-phase voltage command calculated on the basis of a control command for the AC rotary machine, are set in such a manner that a period during which one of a first power converter and a second power converter outputs an effective vector and the other thereof outputs a zero vector occurs during a carrier period of a first carrier wave signal and a second carrier wave signal.

A first offset voltage which is added to voltage commands in a first three-phase voltage command calculated on the basis of a control command for an AC rotary machine, and a second offset voltage which is added to voltage commands in a second three-phase voltage command calculated on the basis of a control command for the AC rotary machine, are set in such a manner that a period during which one of a first power converter and a second power converter outputs an effective vector and the other thereof outputs a zero vector occurs during a carrier period of a first carrier wave signal and a second carrier wave signal.

A semiconductor device according to an embodiment includes a normally-off transistor having a first source, a first drain, and a first gate; a normally-on transistor having a second source electrically connected to the first drain, a second drain, and a second gate, a capacitor having a first end and a second end, the second end being electrically connected to the second gate, a first diode having a first anode electrically connected between the second end and the second gate and having a first cathode electrically connected to the second source, a first resistor provided between the first end and the first gate, and a second diode having a second anode electrically connected to the first end and having a second cathode electrically connected to the first gate, the second diode being provided in parallel with the first resistor.

The disclosure describes examples of integrate circuit (IC) chips. An IC chip includes a first detector configured to generate information indicative of whether an input supply voltage or power is greater than or equal to a first threshold, a second detector configured to receive a circuit voltage or current level and generate information used to indicate a status of the IC chip based on the received circuit voltage or current level, and a controller configured to cause the IC chip to enter a safe mode in response to both the first detector indicating that the input supply voltage or power is greater than the first threshold and the circuit voltage or current level being greater than a second threshold.

The disclosure describes examples of integrate circuit (IC) chips. An IC chip includes a first detector configured to generate information indicative of whether an input supply voltage or power is greater than or equal to a first threshold, a second detector configured to receive a circuit voltage or current level and generate information used to indicate a status of the IC chip based on the received circuit voltage or current level, and a controller configured to cause the IC chip to enter a safe mode in response to both the first detector indicating that the input supply voltage or power is greater than the first threshold and the circuit voltage or current level being greater than a second threshold.

In accordance with at least one aspect of this disclosure, a method for pulse width modulation control includes resolving a reference vector for any number of active space vectors to determine a voltage offset for the reference vector, adding the voltage offset to each active vector to determine a modified modulated signal to be added to a carrier signal, and controlling, with a control module, a switching circuit based at least in part on the modified carrier signal.

In accordance with at least one aspect of this disclosure, a method for pulse width modulation control includes resolving a reference vector for any number of active space vectors to determine a voltage offset for the reference vector, adding the voltage offset to each active vector to determine a modified modulated signal to be added to a carrier signal, and controlling, with a control module, a switching circuit based at least in part on the modified carrier signal.

A rectifier circuit has one or more bridge circuits each with: a first leg with two diodes in series and an AC terminal at a midpoint between the two, a second leg with two semiconductor switches in parallel to the first, a third diode connected to a upper node of each leg, a fourth diode connected to a lower node of each leg, and a capacitor leg with two capacitors in series between the third and fourth diode. A midpoint between the capacitors is connected to a midpoint between the semiconductor switches. The first arrangement is two controllable semiconductor switches in series. A gate node of the second is connected to a first load terminal of the first switch and the first load terminal is connected to the lower node. The second semiconductor switch is a third controllable semiconductor switch with a gate node connected to the lower node.