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This paper presents the analysis and design of isolated voltage-fed single-switch soft-switched converter for magnetron filament heating. A step-down transformer is used to obtain the required voltage conversion ratio and isolation. By low-damped resonance, the primary transistor achieves zero-voltage switching. The secondary diode naturally attains zero-current switching due to discontinuous current...
An interleaved boost power-factor corrector (PFC) with average current control is studied in this paper. It comprises two interleaved boost circuits connected in parallel and operated with average current control. The interleaved operation reduces the input current and output current ripples and also improves the circuit efficiency at light load condition. This paper analyzes the interleaved PFC pre-regulator...
This paper presents the analysis and design of a current-fed push-pull parallel-resonant (CFPP-PR) converter for cooker magnetrons. The CFPP-PR converter is fabricated with a buck converter, a push-pull parallel-resonant inverter and a full-wave voltage doubler. The front-end buck converter synchronously operated with the following push-pull resonant circuit is a controllable dc current source. The...
This paper presents the circuit design of current-fed push-pull resonant inverters for cold cathode fluorescent lamps (CCFL). The current-fed push-pull resonant inverter acts as a sinusoidal current source to drive the nonlinear CCFL loads. The sinusoidal current source may be implemented with a center-tapped transformer and an inductor, or with a general transformer and two inductors. Both designs...
This paper compares a push-pull resonant inverter with a half-bridge resonant inverter for cold cathode fluorescent lamps. The push-pull resonant inverter is fabricated with an input inductor, a center-tapped transformer, a parallel resonant capacitor and two bipolar junction transistors, whereas the halfbridge resonant inverter comprises a series resonant capacitor, a transformer and two metal-oxide-semiconductor...
In this paper, a half-bridge LLC resonant converter with a loose-coupling transformer and a transition capacitor is analyzed and implemented. The LLC resonant tank is comprised with a loose-coupling transformer and a series-resonant capacitor. For transiting the resonant current of the switching transistors and improving the zero-current turn off of the rectifying diodes, a small transition capacitor...
This paper depicts a magnetron driver with half-bridge LLC resonant converter for microwave ovens. The designed driver contains a diode rectifier, a half-bridge switching inverter, an LLC transformer resonant tank and a diode-capacitor full-wave voltage doubler. Input voltage and output current are sensed and sent to a 16 bit digital signal controller for power control. The controller varies the switching...
This paper presents the one-switch and two-switch transition-mode zero-voltage-switching (ZVS) inverters for cooker magnetron drives. Both inverters utilize step-up leakage transformers to boost voltage and limit current. The transformer is magnetized with rectified DC voltage while the main transistor of inverters is conducted. While the main transistor is cut off, the transformer resonates with...
This paper designs a transition-mode zero-voltage-switching inverter for cooker magnetrons. The inverter drives a leakage transformer to generate high voltage and stabilize current. While switch is ON, pulsating input voltage magnetizes the transformer. And, while switch is OFF, the transformer resonates with a parallel capacitor. For achieving zero-voltage switching, a transition-mode driver L6561...
This paper presents a voltage-fed quasi-E resonant inverter for cooker magnetron drives. The design of voltage-fed quasi-E circuits has a choice of using one switch or two switches. Usually, one-switch circuit and two-switch circuit are respectively used in AC110V and AC220V microwave ovens. In the circuit, the filament heating and current stabilization of magnetrons are all supplied with a loose-coupling...
This paper depicts a bipolar switching power supply designed for generating AC, DC, and other user-defined specific waveforms. The bipolar power supply is composed of a remote control board and a power supply module. The power supply module consists of a digital signal processor, an intelligent power module and an LC filter. A twisted-pair wire of CAN bus connects the remote control board and the...
This paper presents the implementation of a neural network controller (NNC) for maximum power point tracking (MPPT). A fuzzy logic controller (FLC) with three fuzzy sets is designed and its look-up control table is used to train a 3-layer feed-forward neural network. The MPPT controllers are implemented with an 8-bit microcontroller, PIC16F877A, and tested on a power source which comprises a voltage...
This paper presents the implementation of maximum power point tracking (MPPT) with fuzzy logic controller. For cost consideration, an inexpensive 8-bit microcontroller, PIC16F877A, is selected and programmed with C language and integer variables. For evaluation, the implemented fuzzy logic controller (FLC) is compared with the MPPT controller of using perturbation and observation (P&O). Both types...
This paper depicts the implementation of a colorful RGB-LED light source with an 8-bit microcontroller. The microcontroller regulates LED light output with pulse-width modulation current and changes the light color with the current ratios of red, green and blue LEDs. While the LED light output varies with temperature, the microcontroller stabilizes the light output of LED with feed-forward compensation...
This paper presents the closed-loop control of high brightness LED lamps using microcontroller. Three types of controllers, proportional-integral (PI) controller, look-up table fuzzy logic controller and real-time calculation fuzzy logic controller are implemented for performance comparison. A photosensitive resistor senses the LED brightness and an 8-bit microcontroller converts brightness signal...
A DC-pulse power supply designed for reactive sputtering plasma applications is presented in this paper. It consists of an H-bridge switching circuits and two DC sources. All pulse parameter values are set in a control panel developed with LabVIEW software. The designed panel adopts RS232 protocol to sequentially transmit the set parameter values to a low-cost 8-bit microcontroller. The microcontroller...
This paper presents a high-brightness RGB-LED lamp of using palette and high-efficiency pulse-number-modulation (PNM) current driver. Target colors of the RGB-LED lamp designed in this paper are specified on a palette of LabVIEW by using a mouse to point it. A complete 24-bit RGB luminance data provided by the palette is split into three separate 8-bit monochromatic commands and sequentially transmitted...
This article presents a contactless charger based on LLC resonant tank and 8-bit microcontrollers. A separated transformer couples the fixed and mobile parts of the contactless charger with two separate windings. The fixed part is composed of a half-bridge circuit and an LLC resonant tank, and the mobile part is just a diode rectifying and filtering circuit. For the purpose of control, each part has...
This paper presents a novel single-stage asymmetrical half-bridge regulator with input current ripple reduction technique. Most of the researched ripple reduction rectifiers cascade a boost-type converter integrates with the system. It is found that the asymmetrical half-bridge resonant converter, when the duty cycles are greater than 50%, can simplify the front end of the boost-type converter to...
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