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The single-ended (SE) resonant inverter is a type of class E parallel resonant inverter and popularly used in many IH applications due to its lower cost structure and relatively high efficiency. However its maximum power rating should be limited because the resonant voltage of SE resonant inverter increases as its power increases. Consequently the maximum power rating of SE resonant inverter should...
Nowadays the field-stop (FS) IGBT provides lower saturation voltage drop and lower switching losses than the conventional non-punch-through (NPT) IGBT, making the FS IGBT well suited for induction heating (IH) applications. A relatively recent improvement in the FS IGBT — the integration of an antiparallel diode on the IGBT die through use of the shorted-anode (SA) technology — made the FS IGBT even...
This paper introduces a newly developed field stop shorted anode trench IGBT with intrinsic body diode like power MOSFETs, and presents its effectiveness for the single ended resonant inverter in induction heating applications. Although the new device combines both IGBT and body diode functions, it can provide better performances by means of an advanced field stop trench IGBT technology. The effectiveness...
This paper introduces a newly developed UniFETTM II MOSFET family of which the body diode characteristic has been highly improved and presents its effectiveness for the mixed frequency switching inverter leg in the HID lamp ballast. Its reverse recovery time, Trr of the body diode is 35 nsec and the peak value of reverse current, irr is also much smaller than that of the typical MOSFET and even smaller...
This paper proposes a new 3-phase interleaved LLC resonant DC-DC converter and its control scheme. The proposed circuit consists of three conventional interleaved LLC resonant DC-DC converters and each converter operates with π/3 of phase difference respectively. Therefore the current ripple of the output capacitor can be significantly reduced and the life cycle of the converter will be extended....
This paper introduces a newly improved MOSFET, ultra-FRFET of which Trr characteristic is much faster than that of the typical MOSFET and presents its effectiveness when it is applied to HV-BLU system of LCD TVs. The reverse recovery time, Trr of ultra-FRFET is shorter than 40 nsec and the peak value of reverse recovery current, irr is also much smaller compared to the typical MOSFET's, which are...
This paper presents a 75W single-stage power supply unit for LED lighting. The proposed power supply designed using flyback converter topology that is controlled by the critical conduction mode control. The secondary side of main transformer is directly connected to LED strings. By a constant current feedback circuit, this flyback converter directly regulates LED current. Although the proposed circuit...
This paper proposes a new lowest-voltage detecting circuit for multi-channel LED backlighting units (BLUs) for LCD TVs. The proposed circuit detects the lowest voltage drop among the multi-channel LED strings with reduced number of devices. After detecting such condition the circuit provides a feedback voltage to control the output voltage of the boost converter. Therefore, it can minimize the power...
In this paper, a recurrent artificial neural network (RNN) based self-tuning speed controller is proposed for the high-performance drives of induction motors. The RNN provides a nonlinear modeling of a motor drive system and could provide the controller with information regarding the load variation, system noise, and parameter variation of the induction motor through the online estimated weights of...
For the backlighting of most LCD panels such as TVs and monitors today, CCFL (cold cathode fluorescent lamp) is widely used because it can provide both low cost manufacturing and high quality color gamut. To illuminate the CCFL, half-bridge or full-bridge resonant inverters are necessary. Although resonant inverters can work under the ZVS condition when the PFM (pulse frequency modulation) method...
This paper presents a wire and wireless linked remote control system for the group lighting system using induction lamps. Ethernet based network communication is used for long distance management and 2.4 GHz RF network is adopted for the local area communication between the main network and the ballast. For the effective remote control and management including dimming using wire and wireless linked...
In this paper, a new dimming algorithm for the electronic ballast of an electrodeless fluorescent lamp is proposed. The proposed method is based on the burst dimming method that controls the duty ratio for the two switches of the electronic ballast by intermittently modulated pulse signal. This paper presents a fully digital circuit using an erasable programmable logic device (EPLD). To verify the...
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