A high-frequency surgical generator including a power supply for supplying rectified electrical energy, a power oscillator for supplying a potential-free, DC current-free and DC voltage-free high frequency voltage and a control device for controlling the high frequency voltage wherein the power supply is configured as a current source for supplying a load-independent output current, such that the load-independent output current of the power supply serves as the control variable for controlling the high-frequency voltage. The target value of the load-independent output current is pre-determined by the control device. The high-frequency surgical generators configured as such achieve improved modulation capability.

Hf surgical generator

A bi-directional DC-DC converter has a transformer for connecting a voltage type full bridge circuit connected to a first power source and a current type switching circuit connected to a second power source. A voltage clamping circuit constructed by switching elements and a clamping capacitor is connected to the current type switching circuit. The converter has a control circuit for cooperatively making switching elements operative so as to control a current flowing in a resonance reactor.

Bi-directional dc-dc converter and method for controlling the same

A power converter including a resonant circuit is controlled by pulse width modulation (PWM) of a switching circuit to control current in the resonant circuit near the frequency of the resonant circuit (a null-immittance criterion) in order to control current and voltage at the output of the resonant circuit. Further control of voltage can be performed by PWM of a switching circuit at the output of the resonant circuit such that centers of the duty cycles of respective switches for the output of the resonant circuit are substantially synchronized and substantially symmetrical about centers of said duty cycles of respective switches at the input of the resonant circuit. Thus, operation of the converter is substantially simplified by using only PWM, a wide range of input and output voltages can be achieved and the converter circuit can be configured for bi-directional power transfer.

Pulse width modulated resonant power conversion

Various circuit configurations and topologies are provided for single and multi-phase, single-level or multi-level, full and half-bridge rectifiers in which diodes are replaced by combinations of voltage-controlled self-driven active switches, current-controlled self-driven active switches and inductors in order to reduce the effects of conduction loss in the diodes.

Generalized ac-dc synchronous rectification techniques for single- and multi-phase systems

A synchronous rectifier using only n-channel devices in which the low-side switches are effectively cross-coupled using low-side comparators and the high-side switches perform an accurate zero-voltage-switching (ZVS) comparison. The charging path of each bootstrap domain is completed through the low-side switches, which are each always on for every half-cycle independent of loading. This scheme gives rectifier efficiency gain because a) each bootstrap domain receives maximum charging time, and b) the charging occurs through a switch rather than a diode. Both these factors ensure the bootstrap domain is fully charged, thereby reducing conduction losses through the rectifier switches. Furthermore, settings may be adjusted by software to optimize the resistive and capacitive losses of the rectifier. Using data for die temperature and operating frequency, software can create a feedback loop, dynamically adjusting rectifier settings in order to achieve the best possible efficiency.

Wireless Power Receiver with Programmable Power Path

A resonance converter and a synchronous rectification driving method thereof are provided. The resonance converter includes a switch circuit having at least two first switches, a resonance circuit having a resonance frequency, a transformer, and a full-wave rectification circuit having two second switches each of which has a drain and a source and generates a channel resistance voltage when a current flows through the drain and the source. The synchronous rectification driving method includes steps as follow. When an operating frequency of the resonance converter is less than the resonance frequency and the resonance converter is coupled to a heavy load, the channel resistance voltage is compared with a reference voltage for driving the second switches of the full-wave rectification circuit; and when the operating frequency of the resonance converter is not smaller than the resonance frequency, duplicated signals of signals used to drive the first switches are respectively used to drive the second switches of the full-wave rectification circuit.

Resonance converter and synchronous rectification driving method thereof

A novel bacteriocin against Staphylococcus aureus from Lactobacillus paracasei isolated from Yunnan traditional fermented yogurt: Purification, antibacterial characterization, and antibiofilm activity.

The present invention provides a continuous conductive planar coil structure. The continuous conductive planar coil structure includes a first output terminal, a second output terminal, a coil body and a projection plane parallel to the coil body, wherein a first projection on the projection plane is formed by the first output terminal, a second projection on the projection plane is formed by the second output terminal, and an overlapping portion is between the first projection and the second projection.

Coil structure for high frequency transformer

The present invention provides a resonance converter and the synchronous rectifying driving method thereof, the resonance converter includes a switching circuit which is composed of at least two first switches, a resonant circuit with resonance frequency, a transformer, and a full wave circuit which is composed of two second switches, wherein each second switch will equally generate channel resistance electric voltage when the current flows through the source and drain, the synchronous rectifying driving method comprises the following procedures: doing comparison to the reference voltage aiming at the channel resistance to drive each second switch of the full wave circuit when the working frequency of the resonance converter is less than the resonance frequency and the resonance converteris connected to the heavy duty; and driving each second switch of the full wave circuit with the identical signal which is respectively drive each first switch when the working frequency of the resonance converter is larger or equal to the resonance frequency. The invention can prevent the generating of the phenomenon that each switch in the synchronous rectifying circuit is incorrectly driven.

Resonance converter and its synchronous commutation driving method

The invention relates a plane conducting body type winding structure, comprising a first outlet end, a second outlet end, a winding body and a projection plane which is parallel to the winding body, wherein the first outlet end projects a first projection on the projection plane, the second outlet end projects a second projection on the projection plane, and the first and the second projections are partially overlapped.

Jian-Ping Ying

Papers

Resonance converter and synchronous rectification driving method thereof

A novel bacteriocin against Staphylococcus aureus from Lactobacillus paracasei isolated from Yunnan traditional fermented yogurt: Purification, antibacterial characterization, and antibiofilm activity.

Coil structure for high frequency transformer

Resonance converter and its synchronous commutation driving method

High-frequency transformer winding structure with planar conductor type winding structure