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Input voltage feedforward apparatus and method

A technology of input voltage and output voltage, which is used in output power conversion devices, DC power input conversion to DC power output, electrical components and other directions, can solve the problem of difficulty in implementing input voltage feedforward, and achieve the effect of reducing overshoot voltage.

Inactive Publication Date: 2018-10-09
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Embodiments of the present invention provide a device and method for input voltage feedforward, to at least solve the problem in the related art that it is difficult to implement input voltage feedforward in two-stage conversion topologies

Method used

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  • Input voltage feedforward apparatus and method

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specific Embodiment 1

[0059] Figure 4 It is a circuit principle block diagram of BUCK+full-bridge two-stage transformation topology input voltage feedforward according to an embodiment of the present invention, as Figure 4 As shown, how this specific embodiment implements input voltage feed-forward will be described in detail below.

[0060] First, let me introduce the working principle of BUCK+ original side full bridge. Such as figure 1 As shown, this topology is the cascading of the first-stage BUCK transformation and the second-stage full-bridge transformation. The input of the full-bridge transformation is the output of the BUCK transformation, and the output rectification adopts full-bridge synchronous rectification. Among them, the second-stage full-bridge conversion works in an open-loop state, and its primary-side main-control drive duty cycle is about 0.48 (it should be noted that this duty cycle can be fine-tuned, and 0.48 is a preferred duty cycle), Therefore, the output filter ind...

specific Embodiment 2

[0066] Figure 7 It is a circuit principle block diagram of BOOST+full bridge two-stage transformation topology input voltage feedforward according to an embodiment of the present invention, as Figure 7 As shown, how this embodiment implements input voltage feed-forward will be described in detail below.

[0067] First, let me introduce the working principle of BOOST+ primary side full bridge whose output adopts full bridge synchronous rectification. Figure 8 It is the main circuit diagram of the BOOST+full bridge two-stage topology according to the embodiment of the present invention, such as Figure 8 As shown, this topology is the cascade of the first-stage BOOST transformation and the second-stage full-bridge transformation, and the input of the full-bridge transformation is the output of the BOOST transformation. Among them, the second-stage full-bridge conversion works in an open-loop state, and the duty cycle of the primary-side main driver is about 0.48, so the out...

specific Embodiment 3

[0073] Figure 11 It is a circuit schematic diagram (2) of BUCK+full bridge two-stage conversion topology input voltage feedforward according to an embodiment of the present invention, as Figure 11 As shown, the difference from the first embodiment is that the third embodiment is applied to the output of the BUCK+full bridge two-stage conversion topology using full-wave synchronous rectification, and the implementation method of input voltage feedforward is the same as that of the first embodiment The method is the same.

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Abstract

The invention provides an input voltage feedforward apparatus and method. The method includes steps: detecting a voltage value of an inductor in a first-stage transformation topology in a secondary control two-stage transformation topology; determining an input voltage value of a secondary control two-stage transformation topology power supply according to the voltage value of the inductor; and performing input voltage feedforward according to the input voltage value of the power supply. According to the apparatus and method, the problem of difficult realization of input voltage feedforward for the two-stage transformation topology is solved, and the effect of substantially reducing an over-charging voltage during rapid change of the input voltage of the switch power supply with the two-stage transformation topology is achieved.

Description

technical field [0001] The present invention relates to the communication field, in particular, to an input voltage feedforward device and method. Background technique [0002] Under normal circumstances, the switching power supply is a regulated output. However, when the input voltage jumps rapidly, such as the input voltage rises rapidly, the overshoot of the output voltage will generally be relatively high due to the effect of the feedback circuit alone, which will easily lead to the malfunction of the output overvoltage protection circuit; when the input voltage drops rapidly At this time, the output voltage drop will be relatively large due to the function of the feedback circuit alone, which will easily cause the reset of the load circuit. At this time, it is necessary to increase the input voltage feedforward circuit, so that the duty cycle of the driving signal can be rapidly reduced or increased with the change of the input voltage, thereby reducing the output volt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/158H02M3/335H02M3/337
CPCH02M3/158H02M3/33569H02M3/3374H02M1/0022H02M1/007
Inventor 刘飞云王俊杰王目舜黄建华柯寿斌
Owner ZTE CORP
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