A Soft Switching Circuit Topology Based on Capacitor Charging and Discharging
A technology of capacitor charging and discharging and soft switching, which is applied in the direction of high-efficiency power electronic conversion, electrical components, output power conversion devices, etc., can solve the problem of auxiliary switches working in hard switching, difficult control of soft switching technology, and high requirements for resonant device parameters. problem, to achieve the effect of wide application frequency range, improved power supply efficiency and economy, and low device parameter requirements
Active Publication Date: 2019-03-15
ANHUI CHANGYUAN GREEN ENERGY
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Problems solved by technology
The QRC quasi-resonant soft switch of the auxiliary switch is added. Although the constant frequency control is realized, the load change or the power supply change will cause the soft switch to fail, while the auxiliary switch works in the hard switching state.
The above-mentioned soft switching technology has the defects of high control difficulty and high requirements on the parameters of the resonant device, which greatly limits the application
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[0034] In order to have a further understanding and recognition of the structural features and the achieved effects of the present invention, the preferred embodiments and accompanying drawings are used for detailed description, as follows:
[0035] The present invention provides 6 basic topological diagrams for reference and description. On this basis, more topological diagrams can be evolved, but the basic principles are the same. At the same time, the present invention provides 3 basic application cases for reference and description. On this basis, more application methods can be deduced, but the basic principles are also similar.
[0036] 1. Topology diagram of soft switching circuit based on capacitor charging and discharging: including main switch 1, main switch freewheeling diode 9, auxiliary switch 2, auxiliary capacitor 3, auxiliary transformer 4, and auxiliary power supply 6. The auxiliary switch 2 is connected in series with the auxiliary capacitor 3, the auxiliary ...
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The invention relates to a soft switching circuit topology based on capacitor charging and discharging, comprising a main switch, one end of which is connected to one end of the primary side of an auxiliary transformer, the other end of which is connected to one end of an auxiliary switch, and the other end of the auxiliary switch is respectively connected to an auxiliary capacitor. One end is connected to the positive pole of the auxiliary power supply, and the other end of the auxiliary capacitor is respectively connected to the negative pole of the auxiliary power supply and the other end of the primary side of the auxiliary transformer. The invention also discloses a control logic sequence method based on the soft switching circuit topology of capacitor charging and discharging. The invention effectively solves the problems of high stress of the switching device, failure of the soft switch due to changes in load and power supply, complex control and difficult selection of parameters of the resonant device. The invention has low device parameter requirements, simple control, small device stress and wide application frequency range, can be applied to various devices with electronic switching devices and power converter devices, and can effectively improve power supply efficiency and reduce system cost.
Description
technical field [0001] The invention relates to the technical field of soft switching topology and control logic of an electronic switch, in particular to a technology for zero-voltage and zero-current turn-on and zero-voltage and zero-current turn-off of an electronic switch device. Background technique [0002] At present, in all kinds of switching power supplies, inverters, frequency converters and other devices, most of the electronic switching devices work in the hard switching state. The hard switching means that the voltage and current on the electronic switching devices are not zero. The switch is turned on or off when the voltage and current on the electronic switching device are zero. Due to the parasitic capacitance and parasitic inductance of electronic circuits and electronic components, electronic switching devices have a switching transition stage, the current gradually increases and the voltage gradually decreases when it is turned on, and the current gradual...
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IPC IPC(8): H02M1/00
CPCH02M1/00H02M1/0058Y02B70/10
Inventor 余晓东张光琴余润菲
Owner ANHUI CHANGYUAN GREEN ENERGY