Bidirectional PFC system adopting digital control

A digital control and control module technology, applied in the field of PFC system, can solve problems such as difficult to achieve satisfactory control effect, achieve the effect of overall performance improvement, system tracking and performance improvement

Pending Publication Date: 2021-07-13
浙江奉天电子有限公司
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Problems solved by technology

Because the gain of the PI algorithm will be low in high-frequency signals, but it has a greater amplification effect on low-frequency signals, so the PI algorithm will amplify the noise signal at low frequencies, and because the rectifier and inverter are nonlinear systems, the traditional The double closed-loop PI control may be difficult to achieve satisfactory control effect

Method used

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  • Bidirectional PFC system adopting digital control
  • Bidirectional PFC system adopting digital control
  • Bidirectional PFC system adopting digital control

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Embodiment Construction

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0028] see Figure 1-13 , the present invention provides a technical solution: a bidirectional PFC system using digital control, including a PFC main circuit, a voltage outer loop control module, a current inner loop control module and a main control chip, characterized in that: the PFC main circuit passes through the main control The ADC of the chip samples the AC voltage, AC current and output voltage sampling values, and the AC voltage, AC current and outpu...

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Abstract

The invention relates to the related field of PFC systems, in particular to a bidirectional PFC system adopting digital control. The bidirectional PFC system comprises a PFC main circuit, a voltage outer loop control module, a current inner loop control module and a main control chip. Through the discretization of a PIR algorithm, a totem pole PFC forward and reverse double closed-loop control algorithm is carried out, and after the algorithm is improved, the PIR algorithm is better in low-frequency and high-frequency control, the system tracking is better, a steady-state error is smaller, and the overall performance is comprehensively improved, so that the performance of an OBC is integrally improved.

Description

technical field [0001] The invention relates to the related field of PFC systems, in particular to a bidirectional PFC system adopting digital control. Background technique [0002] With the development of the global economy, environmental issues have increasingly become problems that countries need to solve. The world is promoting the development of new energy vehicles. A large number of electric vehicles have emerged in the market, increasing the dependence on the power grid, and the impact of charging and discharging behavior of electric vehicles on the power grid has increased significantly. [0003] PFC control becomes an essential part of the on-board charger (OBC), in order to reduce the interference of the charger to the grid during the charging process. PFC works forward to realize AC / DC, connects to the grid, and charges electric vehicle batteries; PFC works in reverse to realize DC / AC, and the electric energy is reversely inverted from the battery pack to generat...

Claims

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Application Information

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IPC IPC(8): H02M1/42H02M7/797
CPCH02M1/4233H02M7/797Y02B70/10
Inventor 杨梦军薛圣立
Owner 浙江奉天电子有限公司
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