Means of Eliminating Electrolytic Capacitor in AC/DC Power Supplies for LED Lightings

Gu, Linlin; Ruan, Xinbo; Xu, Ming; Yao, Kai

doi:10.1109/tpel.2009.2016662

Cited by 359 publications

(135 citation statements)

References 14 publications

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“…(7) Key waveforms of the PFC are illustrated in Fig. 4 when the third harmonic is injected into the input current [10].…”

Section: Concept Of the Third Harmonic Injection Methodsmentioning

confidence: 99%

“…Another circuit produces the combined waveform of the fundamental and the third harmonic using MCU as shown in Fig. 5(b) [10]. This second circuit could have a simple circuitry.…”

Section: Design Of the Third Harmonic Injection Circuitmentioning

confidence: 99%

“…The third harmonic current injection, one of the capacitance reduction methods, has been studied and tested by implementing it on 2 stage PFCs and single stage PFCs [9][10][11]. This method has been implemented either using analog multipliers or a MCU (microcontroller-unit).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Third Harmonic Injection Circuit to Eliminate Electrolytic Capacitors in Light-Emitting Diode Drivers

Yoo¹,

Jung²,

Jeon³

et al. 2012

Journal of Electrical Engineering and Technology

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-A new third harmonic injection circuit for light-emitting diode (LED) drivers is proposed to eliminate electrolytic capacitors and thereby extend the lifetime of LED drivers. When a third harmonic current is injected to the input current of the LED driver, the required capacitance of the driver can be reduced. The proposed circuit can control an injection ratio and has simple circuitry. The synchronous third harmonic is generated by a phase locked loop (PLL), a 1/3 counter, and op-amps and applied to a power factor correction circuit. Thus, the storage capacitor can install film capacitors instead of the electrolytic capacitor. The value of storage capacitance can be reduced to 78% compared to an input power factor of 100%. The proposed circuit is applied to the 80W prototype LED driver to experimentally verify the performances.

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“…(7) Key waveforms of the PFC are illustrated in Fig. 4 when the third harmonic is injected into the input current [10].…”

Section: Concept Of the Third Harmonic Injection Methodsmentioning

confidence: 99%

“…Another circuit produces the combined waveform of the fundamental and the third harmonic using MCU as shown in Fig. 5(b) [10]. This second circuit could have a simple circuitry.…”

Section: Design Of the Third Harmonic Injection Circuitmentioning

confidence: 99%

See 1 more Smart Citation

Third Harmonic Injection Circuit to Eliminate Electrolytic Capacitors in Light-Emitting Diode Drivers

Yoo¹,

Jung²,

Jeon³

et al. 2012

Journal of Electrical Engineering and Technology

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show abstract

“…Possible tradeoff between the input current waveform and the output capacitor size of the pre-regulator has been studied in [13]- [15]. In this paper, an analytical solution for the output voltage ripple of the pre-regulator drawing imperfect sinusoidal input current is provided to predict the relationship between the imperfect sinusoidal input current and the output voltage ripple level.…”

Section: A Derivation Of Output Voltage Ripple Of Ccm Boost Pfc Pre-mentioning

confidence: 99%

“…A survey on the design cost and quality of input current of PFC switching regulators has been reported by García et al [12]. It has been shown in [13]- [15] that pre-regulators drawing imperfect sinusoidal input current can effectively reduce the second harmonic output ripple voltage without increasing their output capacitor. This reduced output ripple voltage arrangement can lead to more stable operation of the pre-regulators [16] and provide possibility of expanding the gain of the output voltage control loop for enhancing the static output voltage regulation.…”

Section: Introductionmentioning

confidence: 99%

Effects of Imperfect Sinusoidal Input Currents on the Performance of a Boost PFC Pre-Regulator

Cheung¹,

Chow

Lai

et al. 2012

Journal of Power Electronics

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This paper investigates the effects of applying different input current waveshapes on the performance of a continuous-conduction-mode (CCM) power-factor-correction (PFC) boost pre-regulator. It is found that the output voltage ripple of the pre-regulator can be reduced if the input current is modified to include controlled amount of higher order harmonics. This finding allows us to balance the performance of output regulation and the harmonic current emission when coming to the design of the pre-regulator. An experimental PFC boost pre-regulator prototype is constructed to verify the analysis and show the benefit of the pre-regulator operating with input current containing higher order harmonics.

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A single‐stage integrated bridgeless AC/DC converter for electrolytic capacitor‐less LED lighting applications

Zheng

et al. 2014

Circuit Theory & Apps

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SUMMARYIn this paper, a single-stage integrated bridgeless AC/DC converter is proposed. As compared to its counterpart that is composed of totem-pole boost power factor correction (PFC) cascade fly-back DC/DC converter, the studied circuit has less components number while overcoming the limits of the totem-pole type. Thus, it is suitable to the low-power LED lighting applications. Furthermore, when both PFC inductors L b and magmatic inductance L m of the transformer TR1 operate at discontinuous current mode, the bus voltage v CB can be used to decouple the ac input and constant dc output power. Thus, the approach of increasing bus voltage ripple is employed to eliminate electrolytic capacitors and obtain long operation lifetime. Additionally, it is able to be compatible with our studied twin-bus configuration for increasing the overall efficiency. A 50-W hardware prototype has been designed, fabricated, and tested in the laboratory to verify the proposed converter validity.

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Means of Eliminating Electrolytic Capacitor in AC/DC Power Supplies for LED Lightings

Cited by 359 publications

References 14 publications

Third Harmonic Injection Circuit to Eliminate Electrolytic Capacitors in Light-Emitting Diode Drivers

Third Harmonic Injection Circuit to Eliminate Electrolytic Capacitors in Light-Emitting Diode Drivers

Effects of Imperfect Sinusoidal Input Currents on the Performance of a Boost PFC Pre-Regulator

A single‐stage integrated bridgeless AC/DC converter for electrolytic capacitor‐less LED lighting applications

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