VERSATILE ZERO-VOLTAGE SWITCH RESONANT INVERTER FOR INDUSTRIAL DIELECTRIC BARRIER DISCHARGE GENERATOR APPLICATIONS
First Claim
1. A dielectric barrier discharge power system comprising:
- an inverter stage;
a resonant tank receiving an output of the inverter stage and outputting a signal for powering at least one dielectric barrier discharge cell; and
a control circuit comprising;
a gate driver providing switching signals to the inverter stage, the switching signals including a phase shift for soft switching; and
a pulse width modulation (PWM) controller for generating a switching frequency for the gate driver, the PWM controller having a first input configured to receive a first signal for adjusting a duty cycle of the switching frequency to perform PWM and a second input configured to receive a second signal for adjusting a clock frequency time constant of the PWM controller to perform frequency modulation (FM);
wherein the control circuit receives a feedback signal from the dielectric barrier discharge system and uses the feedback signal to generate the first signal and the second signal according to a load or line value of the dielectric barrier discharge system.
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Abstract
A power system for a dielectric barrier discharge system, such as used for generating ozone, can include a full bridge inverter stage and parallel resonant tank outputting a signal for powering a dielectric barrier discharge cell stack. The inverter stage is controlled using a combination of pulse width modulation (PWM) and frequency modulation (FM) to enable soft switching through all load conditions—from full load to light load. A current control loop error amplifier compensator can provide a duty cycle adjustment signal to a phase shift PWM controller chip that generates the switching signals for the inverter stage. A feedback signal is also used to adjust a clock frequency time constant of the PWM controller chip to provide the FM. In one embodiment, the feedback signal is an output of an inverting amplifier connected at an output of the current control loop error amplifier compensator.
56 Citations
20 Claims
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1. A dielectric barrier discharge power system comprising:
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an inverter stage; a resonant tank receiving an output of the inverter stage and outputting a signal for powering at least one dielectric barrier discharge cell; and a control circuit comprising; a gate driver providing switching signals to the inverter stage, the switching signals including a phase shift for soft switching; and a pulse width modulation (PWM) controller for generating a switching frequency for the gate driver, the PWM controller having a first input configured to receive a first signal for adjusting a duty cycle of the switching frequency to perform PWM and a second input configured to receive a second signal for adjusting a clock frequency time constant of the PWM controller to perform frequency modulation (FM); wherein the control circuit receives a feedback signal from the dielectric barrier discharge system and uses the feedback signal to generate the first signal and the second signal according to a load or line value of the dielectric barrier discharge system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of generating dielectric barrier discharge, the method comprising:
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providing an inverter stage and resonant tank for powering at least one dielectric barrier discharge cell; and generating switching signals for the inverter stage using a control circuit, the switching signals including a phase shift for soft switching, wherein generating the switching signals comprises; performing pulse width modulation (PWM) of a switching frequency of the switching signals to maintain an output current of the inverter stage at a current set point value; and performing frequency modulation (FM) in parallel with performing the PWM, the FM increasing a switching frequency of the switching signals to reduce output power during a light load condition. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification