Multi-objective optimal hybrid control method for wide output resonant converter of electrosurgical generator
A technology of electrosurgical generator and resonant converter, which is applied in the direction of output power conversion device, electric variable adjustment, control/regulation system, etc. It can solve the problems affecting the overall efficiency and achieve the effect of improving efficiency and power density
Active Publication Date: 2022-05-27
NANJING UNIV OF SCI & TECH
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Problems solved by technology
The control method of the traditional resonant converter is frequency conversion control and hysteresis loop ON-OFF control. Under the frequency conversion control, the circuit works in a stable state and the output voltage ripple is small, but the switching frequency range is too wide when the output voltage is wide; when using the hysteresis loop During ON-OFF control, the switching frequency and duty cycle of the converter are not affected by the control circuit and remain constant, but the frequent start and stop of the converter will affect the overall efficiency, and the output voltage can only be lower than when the converter is always working The voltage value
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[0029] In order to make the purpose, technical solutions and advantages of the present application more clearly understood, the present application will be described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application.
[0030] like figure 1 As shown in the figure, the present invention is an electrosurgical generator wide output resonant converter. The circuit topology includes three parts: an input side circuit, an isolation transformer and an output side circuit. The input side circuit includes an input inductor (L in ), a switch tube (S), a switch body diode (D s ), the first resonant capacitor (C s ), a DC blocking capacitor (C b ), a resonant inductor (L s ), the output side circuit includes a diode (D), a second resonant capacitor (C d ) and an output filter capacitor (C o...
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The invention provides a multi-objective optimal hybrid control method for a wide-output resonant converter of an electrosurgical generator, which adopts a hybrid control combining frequency conversion control and hysteresis loop ON-OFF control. First determine the resonance parameters and switching point voltage; when the output voltage is higher than the switching point voltage, adopt the frequency conversion control method of fixing the switching tube off time and changing the switching tube opening time; when the output voltage is not higher than the switching point voltage, use hysteresis Loop ON-OFF control, that is, when the output voltage is lower than the lower limit of the hysteresis loop width, the control circuit continues to work at a fixed switching frequency, and when the output voltage is not lower than the upper limit of the hysteresis loop width, the control circuit does not work. The invention makes up for the shortcoming that the switching tube frequency range of the converter is too wide when only using the frequency conversion control method to output voltage in a wide range, and solves the problem that the converter starts and stops when the output voltage is high when only the hysteresis loop ON-OFF control is used. The problem of excessive voltage spikes during operation improves the efficiency and power density of the converter.
Description
technical field [0001] The invention relates to a DC / DC resonant converter technology with a wide-range output voltage, in particular to a multi-objective optimal hybrid control method for a wide-output resonant converter of an electrosurgical generator. Background technique [0002] As a high-end medical equipment, electrosurgical generators are widely used in various electrosurgery operations, and have become a research hotspot of scholars from all over the world. The working principle of the electrosurgical generator is to produce a thermal effect on the tissue by outputting a high-frequency current above 100 kHz, so as to cut, coagulate, burn, and vaporize the tissue, thereby coagulating small blood vessels, closing cavities and welding tissues. Different medical applications depend on the output power of the electrosurgical generator, therefore, the electrosurgical generator requires constant power control. However, during the operation, the resistance value of human t...
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IPC IPC(8): H02M3/335
CPCH02M3/33523Y02B70/10
Inventor 顾玲王凌晨李磊
Owner NANJING UNIV OF SCI & TECH