Research on Common Control Methods of Series Resonant Single-Phase Full-Bridge Inverter

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Research on Common Control Methods of Series Resonant Single-Phase Full-Bridge Inverter [Copy link]

Research on Common Control Methods of Series Resonant Single-Phase Full-Bridge Inverter

Abstract: Several commonly used power and frequency control methods for series resonant single-phase full-bridge inverters are discussed, the advantages and disadvantages of various methods are compared, and the pulse width plus frequency modulation method is discussed in depth.

Keywords: amplitude modulation control; pulse frequency modulation; pulse density modulation; resonant pulse width modulation; pulse width plus frequency modulation

With the development of self-shutdown power electronic devices, series resonant inverter circuits have been increasingly used, and various control methods suitable for series resonant inverter circuits have emerged. This paper discusses and compares commonly used control methods such as amplitude modulation control, pulse frequency modulation, pulse density modulation, and resonant pulse width modulation. In particular, the control method of pulse width plus frequency modulation is analyzed in detail. The basic schematic diagram of the series resonant inverter is shown in Figure 1. It includes a DC voltage source, an inverter bridge composed of switches S1 to S4, and a series resonant load composed of R, L, and C. Among them, switches S1 to S4 can use power semiconductor devices with self-shutdown capabilities such as IGBT, SIT, MOSFET, and SITH. The inverter is a single-phase full-bridge circuit, and its control method is that the drive signals of the two switch tubes in the same bridge arm are complementary, and the two diagonal switches are turned on and off at the same time.