Methods, systems, circuits, and devices for power-packet-switching power converters using bidirectional bipolar transistors (BTRANs) for switching. Four-terminal three-layer BTRANs provide substantially identical operation in either direction with forward voltages of less than a diode drop. BTRANs are fully symmetric merged double-base bidirectional bipolar opposite-faced devices which operate under conditions of high non-equilibrium carrier concentration, and which can have surprising synergies when used as bidirectional switches for power-packet-switching power converters. BTRANs are driven into a state of high carrier concentration, making the on-state voltage drop very low.

An image processing circuit includes a first dual sample-and-hold circuit that samples a first data and a second data from a first pixel, a second dual sample-and-hold circuit that samples a third data and a fourth data from a second pixel, a voltage-to-current circuit including a resistor and a current source, that receives the first data and the second data to output a first difference data, and that receives the third data and the fourth data to output a second difference data; and an analog-to-digital converter that converts the first and second difference data from an analog form to a digital form.

According to one aspect of the present invention, a high-voltage power supply device outputs a high voltage of both positive and negative polarities in a switchable manner and includes: a first voltage generation unit; a second voltage generation unit; a first discharging diode connected to the first voltage generation unit; a second discharging diode connected to a the second voltage generation; a first output circuit connected including a first switch and a protective resistor connected in series to each other; a second output circuit including a second switch and a protective resistor connected in series to each other; an output capacitor connected in parallel to a load; a controller controlling the voltage generation units and opening/closing operations of the switches; limitation units configured to limit a time rate of change of a voltage between ends of the a respective switch.

According to one aspect of the present invention, a high-voltage power supply device outputs a high voltage of both positive and negative polarities in a switchable manner and includes: a first voltage generation unit; a second voltage generation unit; a first discharging diode connected to the first voltage generation unit; a second discharging diode connected to a the second voltage generation; a first output circuit connected including a first switch and a protective resistor connected in series to each other; a second output circuit including a second switch and a protective resistor connected in series to each other; an output capacitor connected in parallel to a load; a controller controlling the voltage generation units and opening/closing operations of the switches; limitation units configured to limit a time rate of change of a voltage between ends of the a respective switch.

A switching mode DC/DC power converter for delivering a direct current to a pulse radar unit. A first switching element connects and disconnects the power converter from a power source in each cycle of the power converter. An inductor charges and discharges in each cycle. A capacitor maintains a DC output voltage as the inductor charges and discharges in each cycle. A second switching element transfers energy from the inductor to the capacitor when the first switch disconnects the switching mode power converter from the power source. A control loop regulates the voltage with a time constant, to a predetermined value by controlling the first switching element. An on time for the first switching element in each cycle is chosen to allow the current through the inductor to fall to zero in each cycle. The cycle is shorter than RF pulse duration and time constant of the control loop is longer than the RF pulses.

A high voltage power system is disclosed. In some embodiments, the high voltage power system includes a high voltage pulsing power supply; a transformer electrically coupled with the high voltage pulsing power supply; an output electrically coupled with the transformer and configured to output high voltage pulses with an amplitude greater than 1 kV and a frequency greater than 1 kHz; and a bias compensation circuit arranged in parallel with the output. In some embodiments, the bias compensation circuit can include a blocking diode; and a DC power supply arranged in series with the blocking diode.

A method, apparatus and computer program are disclosed and can include applying a pulse edge to a resonant circuit including an inductive element (for inductively heating a susceptor) and a capacitor, wherein the applied pulse edge induces a pulse response between the capacitor and the inductive element of the resonant circuit, wherein the pulse response has a resonant frequency; determining a period or frequency of the resonant frequency of the pulse response; and converting the determined period or frequency into a distance based, at least in part, on a distance gradient and a first calibration measurement. The distance is based on a separation between the inductive element and the susceptor and the first calibration measurement includes the separation between the inductive element and the susceptor at a calibration temperature.

The present invention relates to a magnetic resonance system and a power supply device for a pulsed load of a magnetic resonance system. Embodiments of the present invention disclose a power supply device for a pulsed load of a magnetic resonance system. The power supply device includes: a switching power supply module, which is used to supply power to a pulsed load; a current measurement module, which is used to generate a pulse measurement signal on the basis of measuring the current of the pulsed load; a signal conversion module, which is used to convert the pulse measurement signal into a narrow pulse signal; and a drive controller, an input end of the drive controller being used to receive the narrow pulse signal, and the drive controller being used to drive the switching power supply module on the basis of the received narrow pulse signal.

The present invention relates to a magnetic resonance system and a power supply device for a pulsed load of a magnetic resonance system. Embodiments of the present invention disclose a power supply device for a pulsed load of a magnetic resonance system. The power supply device includes: a switching power supply module, which is used to supply power to a pulsed load; a current measurement module, which is used to generate a pulse measurement signal on the basis of measuring the current of the pulsed load; a signal conversion module, which is used to convert the pulse measurement signal into a narrow pulse signal; and a drive controller, an input end of the drive controller being used to receive the narrow pulse signal, and the drive controller being used to drive the switching power supply module on the basis of the received narrow pulse signal.

A high-voltage power supply system including a high-voltage regulator, a function generator, and a triggering circuit. The high-voltage regulator includes a microcontroller, a digital-to-analog convertor in communication with the microcontroller, and a high-voltage DC-DC converter in communication with the digital-to-analog converter. The function generator includes a high-voltage inverter including one or more MOSFET switches. The high-voltage inverter is in communication with the microcontroller of the high-voltage regulator. The triggering circuit includes one or more high-voltage electromechanical switches.