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Three-phase interleaved buck PFC circuit and control method thereof

A step-down, circuit technology, applied in electrical components, high-efficiency power electronic conversion, output power conversion devices, etc., can solve problems such as high system cost, large demand for single switch tube capacity, and harmonic difference in grid current.

Pending Publication Date: 2020-05-19
SHENZHEN VAPEL POWER SUPPLY TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the capacitance and inductance of the traditional three-phase step-down PFC circuit are large, and the requirements for the withstand voltage of the capacitor are high.

Method used

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  • Three-phase interleaved buck PFC circuit and control method thereof
  • Three-phase interleaved buck PFC circuit and control method thereof
  • Three-phase interleaved buck PFC circuit and control method thereof

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Embodiment Construction

[0097] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0098]It should be noted that when a component is referred to as being “connected” to another component, it may be directly or indirectly located on the other component. The terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of technical features.

[0099] A three-phase interleaved parallel step-down PFC circuit, such as figure 1 As shown, it includes three-phase input voltage source, three-phase EMC filter, virtual midpoint capacitor, inter...

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Abstract

The invention discloses a three-phase interleaved buck PFC circuit and a control method thereof. The three-phase interleaved buck PFC circuit adopts interleaved parallel circuits, a step-down inductorand a filter capacitor are arranged, PID control is carried out on the capacitor voltage outer loop and the inductor current inner loop through the main controller, feedforward control operation is carried out at the same time, PWM control signals are obtained to control the switch tube, the size of the capacitor and the inductor of the circuit is reduced, the single capacity requirement of the switch tube is small, power grid current harmonic waves are reduced, cost is reduced, and therefore the power factor of a power grid is improved.

Description

technical field [0001] The invention relates to the technical field of electronic power, and more specifically relates to a three-phase interleaved parallel buck-type PFC circuit and a control method. Background technique [0002] Due to the uncontrollable rectification source used in some rectification links of the power grid, a large number of current harmonics are injected into the power grid, which reduces the power factor of the power grid. Three-phase step-down PFC technology, because of its advantages of controllable power factor, step-down, small current harmonics, and easy realization of short-circuit protection, has considerable advantages in occasions where the power supply volume is required to be small, especially in the aerospace field. . [0003] However, the capacitance and inductance of the traditional three-phase step-down PFC circuit are large, and the requirements for the withstand voltage of the capacitor are high. [0004] The above deficiencies need ...

Claims

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Application Information

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IPC IPC(8): H02M1/42
CPCH02M1/4216H02M1/4291Y02B70/10
Inventor 莫汉岐吕志明
Owner SHENZHEN VAPEL POWER SUPPLY TECH
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