[논문]Analysis and Implementation of a Half Bridge Class-DE Rectifier for Front-End ZVS Push-Pull Resonant Converters

Ekkaravarodome, Chainarin; Jirasereeamornkul, Kamon

doi:10.6113/jpe.2013.13.4.626

Analysis and Implementation of a Half Bridge Class-DE Rectifier for Front-End ZVS Push-Pull Resonant Converters 원문보기

Journal of power electronics, v.13 no.4, 2013년, pp.626 - 635

Ekkaravarodome, Chainarin (Dept. of Instrumentation and Electronics Engineering, King Mongkut's University of Technology North Bangkok) , Jirasereeamornkul, Kamon (Dept. of Electronic and Telecommunication Engineering, King Mongkut's University of Technology Thonburi)

Abstract ▼ AI-Helper

An analysis of the junction capacitance in resonant rectifiers which has a significant impact on the operating point of resonance circuits is studied in this paper, where the junction capacitance of the rectifier diode is to decrease the resonant current and output voltage in the circuit when compared with that in an ideal rectifier diode. This can be represented by a simplified series resonant equivalent circuit and a voltage transfer function versus the normalized operating frequency at varied values of the resonant capacitor. A low voltage to high voltage push-pull DC/DC resonant converter was used as a design example. The design procedure is based on the principle of the half bridge class-DE resonant rectifier, which ensures more accurate results. The proposed scheme provides a more systematic and feasible solution than the conventional resonant push-pull DC/DC converter analysis methodology. To increase circuit efficiency, the main switches and the rectifier diodes can be operated under the zero-voltage and zero-current switching conditions, respectively. In order to achieve this objective, the parameters of the DC/DC converter need to be designed properly. The details of the analysis and design of this DC/DC converter's components are described. A prototype was constructed with a 62-88 kHz variable switching frequency, a 12 $V_{DC}$ input voltage, a 380 $V_{DC}$ output voltage, and a rated output power of 150 W. The validity of this approach was confirmed by simulation and experimental results.

주제어

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문제 정의

Due to the effect of the junction capacitance, it is very difficult to design all of the parameters for the converter [15-16]. The objective of this paper is to introduce an analysis of the junction capacitance in a half bridge rectifier diode which has a significant impact on the operating point of the resonance circuit. This is accomplished by using the principle of a half bridge class-DE rectifier with a push-pull resonant converter.

가설 설정

The waveforms of the input current and resonant current are shown in Fig. 14. These waveforms show that the input and resonant currents become close to sinusoidal. The waveforms of the switch voltage and switch current of M₁ are depicted in Fig.
The principle of operation of the half bridge class-DE rectifier with a push-pull resonant converter is explained by the waveforms shown in Fig. 3. The main switches and the rectifier diodes can operate under ZVS and ZCS conditions, respectively. It is reasonable to consider the transformer secondary side as a sinusoidal current source i_r, which is also the input current source of the half bridge class-DE rectifier.
The analysis of the junction capacitance in the half bridge class-DE resonant rectifier for push-pull ZVS resonant converters is demonstrated by the equivalent circuit, as shown in Fig. 5. The diode, D₁, of the half bridge class-DE resonant rectifier operates during the positive half-cycle of the high-frequency transformer secondary side square-wave voltage, while the equivalent circuits of secondary side of the high-frequency transformer are modeled by a squarewave voltage source, u_S. The fundamental component is u_S(t) = V_Ssinw_st, where w_sis the switching angular frequency and the diode, D₂ , operates during the negative half-cycle.
The plots of the magnitude of the AC/DC voltage transfer function V_out/V_S versus the operating frequency f_s/f_rat varied values of the resonant capacitor, C_r, are shown in Fig. 6. It can be seen the impact of the junction capacitance of the rectifier diode cannot be neglected, because the junction capacitance is to decrease the output voltage of the proposed circuit. The range of Q_Lis from 1.
7. Find the value of output capacitor, CO, choose the ripple voltage and assume that the CO is large enough.
With the above design, the operating region of the converter is shown as the shaded area in Fig. 7. It can be seen from the operating region that under a light load, the switching frequency needs to increase a great deal to keep the output voltage regulated. This is a main drawback for series resonant converters.

제안 방법

In order to achieve this objective, the parameters of the DC/DC converter need to be designed properly and the details of analysis and design of this DC/DC converter’s components need to describe.
In this paper, the junction capacitance in a half bridge rectifier diode which has a significant impact on the operating point of the resonance circuit at high-frequency and high voltage conditions has been analyzed, by using the principle of the half bridge class-DE resonant rectifier with a push-pull resonant converter. The proposed scheme ensures more accurate results and provided a more systematic and feasible solution than the conventional resonant push-pull DC/DC converter analysis methodology.
The measured waveforms of the diode voltage uD2 and current iD2 , with the lower two waveforms as zoomed-in views of the top two waveforms.
These issues can be solved by using the principle of the half bridge class-DE rectifier with a push-pull resonant converter. The proposed scheme can ensures more accurate results and provided a more systematic and feasible solution than the conventional resonant push-pull DC/DC converter analysis methodology.
In this paper, the junction capacitance in a half bridge rectifier diode which has a significant impact on the operating point of the resonance circuit at high-frequency and high voltage conditions has been analyzed, by using the principle of the half bridge class-DE resonant rectifier with a push-pull resonant converter. The proposed scheme ensures more accurate results and provided a more systematic and feasible solution than the conventional resonant push-pull DC/DC converter analysis methodology. All of the power switches are operated under the soft switching condition.

대상 데이터

8. The MOSFETs are modeled by switches with the on-resistances, r_DS1 and r _DS2 . The resistances, r_P1, r_P2, and r_S represent the equivalent resistances of the physical primary and secondary leakage inductors, L_lP1, L_lP2 and L_lSof the transformer, respectively.
The converter employs (IRFP2907 International Rectifier) MOSFETs, each with an on-resistance, rDS , of 4.5 mΩ.

성능/효과

2. Find the loaded-quality factor, Q_L, value by assuming that the switching frequency, f_s, is approximately equal to the resonant frequency, f_r, for full power.

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