A two-stage power converter can incorporate a buck pre-regulator and a resonant bus converter. Such a converter may be operated to achieve unconditional soft switching operation (zero voltage switching a/k/a ZVS) over a wide input and output range, while delivering excellent power conversion efficiency at lower power levels and in a no load condition.

A circuit comprises an H-bridge circuit that includes a pair of current sources and a plurality of transistors. The H-bridge circuit includes a first output and a second output. One of the current sources is coupled to receive a supply voltage. A control circuit is configured to control, based on a sum of voltages on the first and second outputs, current of at least one of the current sources through at least some of the plurality of transistors.

A power supply circuit has a push-pull portion having a transformer; first and second terminals of the primary winding, each connected to ground via first and second switches; an inductor connected between an input voltage and the primary winding centre tap via a third switch; an energy storage portion connected between the primary winding and ground, and to the inductor via a fourth switch; a controller arranged to monitor the input voltage and to apply partially overlapping first and second PWM signals to the first and second switches; when input voltage is between first and second thresholds, the controller closes the third switch and opens the fourth switch; above the second threshold, the controller applies a third PWM signal to the third switch and opens the fourth switch; and below the first threshold, the controller closes the third switch and applies a fourth PWM signal to the fourth switch.

A two-stage power converter can incorporate a buck pre-regulator and a resonant bus converter. Such a converter may be operated to achieve unconditional soft switching operation (zero voltage switching a/k/a ZVS) over a wide input and output range, while delivering excellent power conversion efficiency at lower power levels and in a no load condition.

The present application discloses a multi-port energy storage battery. The multi-port energy storage battery comprises a battery case including a first port, a second port and a third port; a battery module, including a first interface, the first interface is connected to the first port, the battery module is configured to connect an external power supply module via the first port and first interface, so as to charge the battery module; a DC-DC converter, including a second interface and a third interface, the second interface is connected with the first interface, and the third interface is connected with the second port, the DC-DC converter is configured to boost battery voltage to a DC high voltage and then output it through the second port; a DC-AC converter, including a fourth interface and a fifth interface, the fourth interface is connected with the first interface, the fifth interface and the third port.

A power supply consisting of double stages. Wherein one stage generates a high voltage using current methods. While the second stage generator an amperage pulse which is inserted into the high voltage circuit, causing both elements to fuse and operate as one entity.

The invention provides a power supply device and a charged particle beam device capable of reducing noise generated between a plurality of voltages. The charged particle beam device includes a charged particle gun configured to emit a charged particle beam, a stage on which a sample is to be placed, and a power supply circuit configured to generate a first voltage and a second voltage that determine energy of the charged particle beam and supply the first voltage to the charged particle gun. The power supply circuit includes a first booster circuit configured to generate the first voltage, a second booster circuit configured to generate the second voltage, and a switching control circuit configured to perform switching control of the first booster circuit and the second booster circuit using common switch signals.

An inverter control board that is configured to be connected to an inverter for performing conversion between direct current power and multiple-phase alternating current power, wherein the inverter has arms, each arm provided for one alternating current phase and comprising a series circuit of a high-side switching element to be connected to a direct-current positive electrode and a low-side switching element to be connected to a direct-current negative electrode.

A power conversion system including a power conversion unit, a power circuit and a precharge circuit is provided. The power conversion circuit includes an input port, an output port, switching power conversion units and at least one storage device. The storage device is connected between the input and output ports in series. The power circuit is electrically connected to the power conversion circuit for receiving the input voltage and outputting a supply voltage to the power conversion circuit, and the power circuit includes a magnetic element. The precharge circuit precharges the storage device. The precharge circuit includes a winding and a rectifier filter circuit connected to each other. The winding is coupled to the magnetic element for receiving a conversion voltage. The rectifier filter circuit is electrically connected to the storage device so as to receive the conversion voltage and output a charge voltage to the corresponding storage device.

A power supply circuit has a push-pull portion having a transformer; first and second terminals of the primary winding, each connected to ground via first and second switches; an inductor connected between an input voltage and the primary winding centre tap via a third switch; an energy storage portion connected between the primary winding and ground, and to the inductor via a fourth switch; a controller arranged to monitor the input voltage and to apply partially overlapping first and second PWM signals to the first and second switches; when input voltage is between first and second thresholds, the controller closes the third switch and opens the fourth switch; above the second threshold, the controller applies a third PWM signal to the third switch and opens the fourth switch; and below the first threshold, the controller closes the third switch and applies a fourth PWM signal to the fourth switch.