A High DC voltage Generator by LC Resonance in Commercial Frequency

Abstract

For small capacity rectifier circuits such as those for consumer electronics and appliances, rectifier circuits of the capacitor input type are generally used. The various harmonics generated within such a power system become a serious problem. Various studies to reduce these effects have been presented so far. However, most of these employ switching devices, such as MOSFETs and the like. Removing the need for switching devices renders the systems more tolerant to over-load, and brings low RF noise benefits. The authors have proposed a power factor correction scheme using a LC circuit, resonant at a commercial frequency, without using switching devices. This method makes a sinusoidal wave by widening conduction period using the current resonance in commercial frequency. It is found that a output high voltage may be readily obtained by means of the LC resonance in this PFC circuit, such that the dc output voltage achieved can be as great as ten times the ac input voltage. In this paper the results are reported and confirmed from both theoretical and experimental implementations.

An Ultrasonic Through-Metal-Wall Power Transfer System with Regulated DC Output

“…The RF AC-DC converter used in the system is constructed from a resonant-type rectifier and a DC-DC converter as shown in Figure 8. The resonant-type rectifier was originally proposed by Matsui et al [25] as a high DC voltage generator. Kusaka et al improved it and developed an AC-DC converter from it for a magnetic resonance coupling WPT system [26,27].…”

“…We simplified the topology proposed by Kusaka et al, and redesigned it for our UTMWPT system. The resonant-type rectifier increases the conduction angle of the input current and the DC-DC converter stabilizes the operating point of the resonant-type rectifier [25][26][27]. These two features together achieve the input impedance matching of the AC-DC converter to the acoustic-electric channel.…”

“…Note that the DC-DC converter is drawn as an ideal voltage source with voltage V con in Figure 9 because the DC-DC converter with large capacitance C 5 can be assumed as an ideal voltage source [26]. The operation modes of the AC-DC converter can be mathematically analyzed [25][26][27].…”

“…According to (25) and (30), the amplitude and phase of the input current are determined by the resonant parameters: the capacitance C, inductance L 1 , the relation between the input voltage amplitude V in and rectifier output voltage V con . Therefore, the intended input impedance of the AC-DC converter, which is the same as the output impedance of the matched acoustic-electric channel, can be obtained by designing these parameters properly.…”

Reduction of Reflected Power Loss in an AC-DC Converter for Wireless Power Transfer Systems

“…The resonant-type rectifier has been demonstrated in a commercial frequency in Ref. (31). However, this converter becomes a low power density in the low-frequency operation because a huge inductor and capacitors as resonance components are required.…”