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Switch power supply load disturbance feedforward control circuit

A feedforward control, switching power supply technology, applied in the direction of high-efficiency power electronic conversion, electrical components, output power conversion devices, etc., to achieve the effect of avoiding contradictory relationships

Active Publication Date: 2012-07-25
BEIJING SUPLET +1
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AI Technical Summary

Problems solved by technology

[0004] The embodiment of the present invention provides a switching power supply load disturbance feed-forward control circuit to solve the problem that in the existing high-frequency switching power supply technology, it is impossible to meet the requirements of high-performance PF and THD indicators while meeting the high-performance load disturbance indicators.

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  • Switch power supply load disturbance feedforward control circuit
  • Switch power supply load disturbance feedforward control circuit
  • Switch power supply load disturbance feedforward control circuit

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Embodiment Construction

[0021] 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.

[0022] With the continuous progress of digital control technology, digital switching power supply has become a development trend of medium and high-power high-end switching power supply, and the technology of using digital signal processor (DSP) to realize PFC has been widely used. The application of DSP makes the control algorithm of PFC very flexible.

[0023] In order to solve the problem that in the existing high-frequency switching power supply technology...

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Abstract

The invention discloses a switch power supply load disturbance feedforward control circuit and relates to the technical field of high-frequency switch power supplies. In the invention, the feedforward control is formed by adding load disturbance information into a power factor correction (PFC) circuit control loop; when an output power increases due to the load disturbance, the current loop reference of the PFC circuit increases and the inductive current of the PFC circuit increases correspondingly due to the closed-loop control of the current loop of the PFC circuit, so that the entire PFC circuit can make a quick response to the load disturbance; and vice versa. On the other hand, the load disturbance feedforward control only functions when loads change and therefore avoids influencing stable index THD and PF. Thus, contradiction relationship between a load disturbance index and the THD and PF indexes in the prior art is resolved, and the power factor and the THD index of input current harmonics increase with the increase in the load disturbance index.

Description

technical field [0001] The invention relates to the technical field of high-frequency switching power supplies, in particular to a load disturbance feedforward control circuit of a switching power supply. Background technique [0002] With the continuous development of high-frequency switching power supply technology, the user's electrical performance requirements for power supply products are also increasing, such as: power factor (PF), input current harmonics (THD), load disturbance, etc. The power factor correction (PFC) technology has been widely used at present, which has greatly improved the performance indicators of power supply steady-state PF and THD. [0003] During the process of implementing the present invention, the inventor found that in the prior art, because many users have high requirements on load disturbance, the traditional control technology cannot meet the high-performance load disturbance index and also meet the high-performance PF and THD index requi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/42H02M1/12
CPCY02B70/126Y02B70/10
Inventor 柏建国邓礼宽
Owner BEIJING SUPLET
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