The disclosure relates to a method and a control device for controlling at power semiconductor switches connected in parallel for switching a total current. The semiconductor switches each have a gate terminal. An input terminal for feeding the total current, an output terminal for discharging the total current, and a joint control terminal for receiving a joint control signal that has the state ‘disconnect’ or ‘connect’ are provided. The power semiconductor switches are each connected between to the input terminal and the output terminal. At least one ascertainment unit is designed to receive the joint control signal, ascertain individual control signals in accordance with the joint control signal to control the individual power semiconductor switches, and output the individual control signals to the gate terminals of the power semiconductor switches. The individual control signals each have the state ‘disconnect’ or ‘connect’ and differ at least temporarily.

An electric power converter for converting AC to DC power or DC to AC power is disclosed. The converter includes a circuit for controlling the voltage and the circuit for controlling the current separately. The voltage is controlled by the switching modules and the up-side controller using the calculated target voltage. The current is controlled by the current controller using the calculated target current.

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.

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.

A circuit structure of a voltage type single-stage multi-input low-frequency link inverter with an external parallel-timesharing select switch is formed by connecting a plurality of input filters connected to ground and a common output low-frequency isolation voltage-transformation filter circuit through a multi-input single-output high-frequency inverter circuit. Each input end of the multi-input single-output high-frequency inverter circuit is connected to an output end of each of the input filters in a manner of one-to-one correspondence. An output end of the multi-output single-input high-frequency inverter circuit and the output low-frequency isolation voltage-transformation filter circuit are connected. The multi-input single-output high-frequency inverter circuit includes an external multi-path parallel-timesharing select four-quadrant power switch circuit and a bidirectional power flow single-input single-output high-frequency inverter circuit successively connected in cascade.

A power inversion apparatus includes a smoothing capacitor, first and second primary coils, a secondary coil, first to fourth switches of bridge circuit switches, a clamp capacitor, and a switch controller. The switch controller calculates a lower-arm duty ratio of each of the first and second switches using a map or a mathematical expression by feed-forward control based on an input voltage. The switch controller outputs a fixed value that is equal to or greater than a maximum value of the lower-arm duty ratio within a variation range of the input voltage as an upper-arm duty ratio of each of the third and fourth switches. The switch controller generates a pulse width modulation signal based on the calculated lower-arm duty ratio and the fixed value of the upper-arm duty ratio, and outputs the pulse width modulation signal to the bridge circuit switches.

In various embodiments, a control circuit for a radio frequency drive of an electrosurgical device is disclosed comprising a voltage data input configured to receive voltage data, a current data input configured to receive current data, and a switching signal output configured to source a switching signal. The control circuit is configured to adjust a frequency of the switching signal based on the voltage data and the current data. The radio frequency drive comprising a transformer comprising a first tap, a second tap, a third tap, a first portion of a primary coil, a second portion of the primary coil, and a secondary coil. Two of the first, second, and third taps are selected to drive the primary coil between the two selected taps.

A power supply device for converting an AC power input into a DC power output comprises a rectifier module connected to the AC power input for producing rectified power; a final stage DC-DC converter for producing the DC power output; and one or more smoothing stages provided between the rectifier module and the final stage DC-DC converter to smooth the rectified power. There is an initial DC-DC converter module is provided between the rectifier and one of the smoothing stages to lower the voltage range of the output signal from the rectifier. The lowered voltage range of the rectified power is provided directly to the final stage DC-DC converter, without a power storage device storing the lowered voltage range rectified power.

A power inversion apparatus includes a smoothing capacitor, first and second primary coils, a secondary coil, first to fourth switches of bridge circuit switches, a clamp capacitor, and a switch controller. The switch controller calculates a lower-arm duty ratio of each of the first and second switches using a map or a mathematical expression by feed-forward control based on an input voltage. The switch controller outputs a fixed value that is equal to or greater than a maximum value of the lower-arm duty ratio within a variation range of the input voltage as an upper-arm duty ratio of each of the third and fourth switches. The switch controller generates a pulse width modulation signal based on the calculated lower-arm duty ratio and the fixed value of the upper-arm duty ratio, and outputs the pulse width modulation signal to the bridge circuit switches.

A circuit structure of a voltage type single-stage multi-input low-frequency link inverter with an external parallel-timesharing select switch is formed by connecting a plurality of input filters connected to ground and a common output low-frequency isolation voltage-transformation filter circuit through a multi-input single-output high-frequency inverter circuit. Each input end of the multi-input single-output high-frequency inverter circuit is connected to an output end of each of the input filters in a manner of one-to-one correspondence. An output end of the multi-output single-input high-frequency inverter circuit and the output low-frequency isolation voltage-transformation filter circuit are connected. The multi-input single-output high-frequency inverter circuit includes an external multi-path parallel-timesharing select four-quadrant power switch circuit and a bidirectional power flow single-input single-output high-frequency inverter circuit successively connected in cascade.