A high-frequency isolated AC/DC conversion circuit and a control method thereof

A high-frequency isolation and conversion circuit technology, applied in the direction of converting DC power input to DC power output, AC power input converting to DC power output, control/regulation systems, etc., can solve the problem of low work efficiency, AC-DC bidirectional conversion circuit design Complex, difficult to achieve high-frequency isolation and other issues, to reduce switching loss, suppress AC anti-bias function, reduce turn-on and turn-off stress

CN109039121APending Publication Date: 2018-12-18NANJING PANDA ELECTRONICS
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2018-12-18

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Abstract

The invention discloses a high-frequency isolated AC-DC conversion circuit and a control method thereof. The circuit comprises an input filter, an input transformer, an AC rectifier unit, an energy storage filter unit, a resonant conversion unit, an isolation transformer, a DC side rectifier unit and an output energy storage unit. The conversion circuit of the invention can work in three modes ofrectification, inverter or standby. By using the input transformer, the common-mode current on the AC side and the AC anti-deviation function can be effectively rejected while the energy storage function is realized, and the common-mode interference of the AC rectifier unit to the ground can be effectively reduced. In addition, the resonant conversion unit can realize the bi-directional conversionof soft switch, which reduces the on and off stress of each component and reduces the switching loss. Finally, multi-state conversion can be realized in the bi-directional conversion of DC voltage ina wide range by using the combination of resonant conversion unit and DC side rectifier unit to turn on the timing control.
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Description

technical field

[0001] The invention relates to a switching power supply, in particular to a high-frequency isolated AC-DC conversion circuit and a control method thereof. Background technique

[0002] In applications that require AC-DC bidirectional conversion (that is, with rectification and inverter modes), such as inverters for energy storage systems, hybrid power grid-connected inverters, lithium battery factory composition capacity, aging detection, etc. , the traditional two sets of circuits of rectification and inverter, or the scheme of low-frequency isolation transformer plus high-frequency inverter, so the volume is large, and the cost performance is poor in the field of small power; the main reason is that the high-frequency isolation two-way Transformation technology is difficult to implement. The low-frequency transformer isolation technology is relatively mature and stable. Therefore, compared with the high-frequency isolation technology, the combination of t...

Examples

Embodiment 1

[0026] Such as figure 1 As shown, a high-frequency isolated AC-DC conversion circuit provided by an embodiment of the present invention includes: an input filter 1, an input transformer 2, an AC rectification unit 3, an energy storage filter unit 4, a resonant conversion unit 5, and an isolation transformer 6 , the DC side rectification unit 7 and the output energy storage unit 8, wherein the resonant conversion unit 5, the isolation transformer 6, and the DC side rectification unit 7 are collectively referred to as a DC-DC conversion unit;

[0027] The input terminal of the input filter 1 is connected to an AC signal, the output terminal of the input filter 1 is connected to the two opposite ends of the input transformer 2, and the other two opposite ends of the input transformer 2 are connected to The input end of the AC rectification unit 3 is connected, the output end of the AC rectification unit 3 is connected to the input end of the energy storage filter unit 4, and the ...