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A zero-voltage switching (ZVS) pulse-width-modulation (PWM) single-phase inverter using a ZVS transformer-isolated step-up/down dc link is presented in this paper. The proposed ZVS transformer-isolated step-up/down dc link not only makes the switches in single-phase inverter can operate at ZVS condition, but it has a step-up/down input voltage function and it provides an isolation function. Moreover,...
This paper presented a high performance DC power supply system with high input power factor. The presented DC power supply system provides the input current with low current distortion on the ac input side and the stable output dc voltage with low ripple voltage on the dc output side. The presented DC power supply system only uses four active switches to correct power factor in input side and regulate...
A novel soft-switching interleaved boost dc/dc converter is proposed in this paper. The proposed converter combines the conventional pulse-width-modulation technique, soft commutation technique to promote the circuit performance. The proposed converter uses two boost dc/dc converters with interleaved operation to increase the output power and reduce the input ripple current and output ripple voltage...
A high performance interleaving AC to DC converter is introduced in this paper. The proposed converter adopted two shunted elementary isolated AC to DC converter. They operate at interleaving mode for advancing its supply power. The current stress of main switches in the presented converter can be reduced. Moreover, the current ripple of output and input in it also can be decreased. Furthermore, every...
An estimation method of the state-of-charge (SOC) and the state-of-health (SOH) for Li-ion batteries is implemented in this paper. For the proposed methods, we defined the ratio between the variations in voltage and the variations in current in each cell during the operation processes of battery modules as the dynamic impedance, which is used to determine the SOC of the battery. Any initial values...
The messages can be exchanged in a fair manner if after the protocol, both exchanging parties can simultaneously obtain their desired messages or none of them can get useful information. Since the network communication is time consuming, the major approach for this issue is to develop a off-line trusted third party (off-line TTP) which gets involved into the exchange procedure only if at least one...
A systematic synthesis method to generate transconductance filters using nodal admittance matrix (NAM) expansion is proposed. The obtained circuits with two input voltage terminals and three output currents employing only two grounded capacitors and three resistors can be used to realize the transconductance-mode universal filter. The synthesized filters enjoy the properties of orthogonal controllability...
A soft-switching single-phase high power factor interleaved boost rectifier is proposed in this paper. The proposed rectifier includes two identical boost rectifiers which are operated in interleaved operation mode to increase the output power and reduce the input ripple current and output capacitor size. The proposed rectifier uses a soft-switching auxiliary circuit to get the soft-switching function...
A SOC-based charger for the LiFeO4 battery pack is implemented in this paper. The main circuit is a full-bridge phase-shift converter. The user can select the charging strategy and observe the state of charge (SOC) of the battery from the operation interface. Moreover, the proposed charger system communicates with the battery management system via the I2C interface, and generates the charging current...
A MCU-based electronic ballast for electrodeless fluorescent lamp (EFL) is implemented in this paper. The main circuit consists of a class D converter and a resonant circuit to form a resonant inverter. In addition, an 8-bit microcontroller is employed to act as the control core of the system to achieve soft start and smooth dimming feature. Moreover, we not only discuss the lamp model, the related...
This paper proposes a dc power supply system to give high power factor and low current distortion on the rectifier side and provide stable dc voltage on the isolated dc/dc converter side. The proposed dc power supply system uses a new ZCS strategy to get ZCS function. Besides operating at constant frequency, all semiconductor devices operate at ZCS without additional current stress. A significant...
A ZCS-PWM interleaved boost rectifier with high power factor is proposed in this paper. The pulse-width-modulation technique and soft commutation technique are used in the proposed rectifier to promote the circuit performance. The proposed circuit includes two boost converter which are operated at interleaved mode to increase the output power and reduce the input ripple current. A ZCS-PWM auxiliary...
A burst dimming controller with primary-side control for electrodeless fluorescent lamp (EFL) electronic ballast is implemented in this paper. The used main circuit is a class D topology with a resonant circuit to form a resonant inverter. Moreover, an 8-bit microcontroller is employed to act as the control core of the system to achieve soft start, burst dimming, and primary-side control feature....
A microcontroller-based electronic ballast for electrodeless fluorescent lamp (EFL) is implemented in this paper. The main circuit consists of a class D converter and a resonant circuit to form a resonant inverter. In addition, an 8-bit microcontroller is employed to act as the control core of the system to achieve soft start and smooth dimming feature. Moreover, we not only discuss the lamp model,...
This paper proposed a single-stage resonant buck-boost ac voltage regulator. The proposed regulator can output a voltage which is larger or lower than the input ac one and is dependence on depending on the instantaneous duty-ratio. This property is not found in the conventional single-stage ac voltage regulator that the ac output instantaneous voltage is always lower than the input ac voltage. The...
This paper analyses and designs a ZCS-PWM single-phase high power factor interleaved boost rectifier. The proposed rectifier combines the conventional pulse-width-modulation technique and soft commutation technique to promote the circuit performance. The proposed rectifier uses two boost rectifiers with interleaved operation to increase the output power and reduce the output ripple current and input...
In this paper, A MCU-based electronic ballast for electrodeless fluorescent lamp (EFL) is implemented. The used two stage system consists of a power factor corrector and a class D resonant inverter. In addition, an 8-bit microcontroller is employed to act as the control core of the system to achieve digital control feature. Moreover, we not only discuss the lamp model, derive the frequency characteristics,...
A MCU-based charger for the LiFeO4 battery pack is implemented in this paper. The main circuit is a full-bridge phase-shift converter. The user can select the charging strategy and observe the state of charge (SOC) of the battery from the operation interface. Moreover, the proposed charger system communicates with the battery management system via the I2C interface, and generates the charging current...
A zero-current transition (ZCT) pulse-width-modulation (PWM) interleaved boost dc/dc converter using a ZCT-PWM auxiliary circuit is presented in this paper. All semiconductor devices in the proposed interleaved boost converter operate at ZCS turn on and turn off. Besides operating at constant frequency and reducing commutation losses, the proposed converter has no additional current and voltage stress,...
This paper proposes an impulsed-power, which is used to eliminate arcing phenomenon and to maintain lamp luminance for field emission lamp driving. To compact the system configuration and to reduce the system cost, the flyback topology is employed as the main circuit. Next, the phase-locked loop technique is embedded as a feedback mechanism in this study. With the proposed control mechanism, the peak...
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