Secondary-side control of a constant frequency series resonant converter using dual-edge PWM

Tschirhart, D.J.; Jain, Praveen

doi:10.1109/apec.2010.5433617

Cited by 5 publications

(4 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The fundamental of the resonant current defined by (5) is simply the ratio of drive voltage to tank impedance In (3), R ac is the equivalent ac resistance of the load and rectifiers referred to the transformer primary. The equation for R ac is given by (6) where R L is the converter load resistance, N is the transformer turns ratio, and β is a conversion factor that is unity under traditional primary-side control methods, and greater than or equal to unity when load regulation is achieved by secondaryside control [19]. The resonant frequency of the tank is given by (7), relative operating frequency by (8), and quality factor by (9)…”

Section: A Resonant Tankmentioning

confidence: 99%

Design Procedure for High-Frequency Operation of the Modified Series-Resonant APWM Converter to Reduce Size and Circulating Current

Tschirhart

Jain

2012

IEEE Trans. Power Electron.

View full text Add to dashboard Cite

In this paper, a generalized analysis for the auxiliary network in a modified series-resonant asymmetrical pulsewidth-modulated (APWM) converter is performed to produce a design procedure that ensures that zero voltage switching (ZVS) is achieved for any series-resonant APWM converter design. New equations that correctly predict the magnitude of auxiliary current are obtained by accounting for the trapezoidal nature of the waveforms associated with high-frequency operation, and the dead time between the switches in the half-bridge. A design example of a 48-V/1.2-V, 25-A converter operating at 1 MHz is chosen to highlight the validity of the proposed design and that superior results can be achieved if the resonant tank is designed in tandem with the auxiliary network. Experimental results verify that ZVS is achieved, and that the proposed design reduces the auxiliary inductor by close to a factor of 3.

show abstract

Section: A Resonant Tankmentioning

confidence: 99%

Design Procedure for High-Frequency Operation of the Modified Series-Resonant APWM Converter to Reduce Size and Circulating Current

Tschirhart

Jain

2012

IEEE Trans. Power Electron.

View full text Add to dashboard Cite

show abstract

“…Cross conduction results in premature transistor failure, excessive output noise, low efficiency and excessive heat [8]. The most common method used to prevent cross conduction is to provide a dead time between the complementary driving pulses, HO and LO, in order to turn off both of the transistors at the same time.…”

Section: The Proposed Llc Resonant Convertermentioning

confidence: 99%

A Wide Frequency Range LLC Resonant Controller IC with a Phase-Domain Resonance Deviation Prevention Circuit for LED Backlight Units

Park¹,

Kim²,

Chun³

et al. 2015

Journal of Power Electronics

View full text Add to dashboard Cite

This paper presents a wide frequency range LLC resonant controller IC for LED backlight units. In this paper a new phase-domain resonance deviation prevention circuit (RDPC), which covers a wide frequency and input voltage range, is proposed. In addition, a wide range gate clock generator and an automatic dead time generator are proposed. The chip is fabricated using 0.35 µm BCD technology. The die size is 2 x 2 mm2. The frequency of the clock generator ranges from 38 kHz to 400 kHz, and the dead time ranges from 300 ns to 2 µs. The current consumption of the LLC resonant controller IC is 4 mA for a 100 kHz operation frequency using a supply voltage of 15 V.

show abstract

“…Also, primary side control of LED back light units causes the LED driver system to become complicated and bulky because additional OP-Amps, isolation, and discrete devices should be used to sense the load variations on the secondary side and feed this back to the primary side. To remove the opto-coupler from the feedback loop and to achieve fast dynamic performance, a secondary side output regulation method was presented in [13]. However, this method requires an additional chopper circuit to regulate against line variations.…”

Section: Introductionmentioning

confidence: 99%

A High Efficiency Controller IC for LLC Resonant Converter in 0.35 μm BCD

Hong¹,

Kim²,

Park³

et al. 2011

Journal of Power Electronics

View full text Add to dashboard Cite

This paper presents a LLC resonant controller IC for secondary side control without external active devices to achieve low profile and low cost LED back light units. A gate driving transformer is adopted to isolate the primary side and the secondary side instead of an opto-coupler. A new integrated dimming circuitry is proposed to improve the dynamic current control characteristic and the current density of a LED for the brightness modulation of a large screen LCD. A dual-slope clock generator is proposed to overcome the frequency error due to the under shoot in conventional approaches. This chip is fabricated using 0.35 µm BCD technology and the die size is 2 × 2 mm 2 . The frequency range of the clock generator is from 50 kHz to 500 kHz and the range of the dead time is from 50 ns to 2.2 µs. The efficiency of the LED driving circuit is 97 % and the current consumption is 40 mA for a 100 kHz operation frequency from a 15 V supply voltage.

show abstract

Secondary-side control of a constant frequency series resonant converter using dual-edge PWM

Cited by 5 publications

References 8 publications

Design Procedure for High-Frequency Operation of the Modified Series-Resonant APWM Converter to Reduce Size and Circulating Current

Design Procedure for High-Frequency Operation of the Modified Series-Resonant APWM Converter to Reduce Size and Circulating Current

A Wide Frequency Range LLC Resonant Controller IC with a Phase-Domain Resonance Deviation Prevention Circuit for LED Backlight Units

A High Efficiency Controller IC for LLC Resonant Converter in 0.35 μm BCD

Contact Info

Product

Resources

About