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Switch Mode Power Supply Compensation Loop

A mode and feedback loop technology, applied in the direction of electrical components, regulating electrical variables, output power conversion devices, etc.

Inactive Publication Date: 2019-09-17
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this approach usually requires the designer to have a good understanding of the system at hand and in many cases results in a sub-optimal solution

Method used

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  • Switch Mode Power Supply Compensation Loop
  • Switch Mode Power Supply Compensation Loop
  • Switch Mode Power Supply Compensation Loop

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] figure 1 is a schematic diagram showing components of SMPS 100 useful for understanding the present invention along with apparatus 200 for determining the values ​​of control parameters for tuning the feedback loop of SMPS 100.

[0033] In the present embodiment, the SMPS 100 includes a switching circuit 110 including at least one switching element (eg, a MOSFET) arranged in the switching circuit 110 and controlled to operate at high frequencies (typically tens to hundreds of kHz) ) to switch with a duty cycle to convert the input DC voltage V of the SMPS 100 in Converted to an output voltage, which is filtered by a low-pass filter 120 of the SMPS (eg, a first-order LC filter including an inductor and one or more capacitors) to generate the output DC voltage V of the SMPS 100 out . As in this embodiment, the switching circuit 110 may include an isolation transformer having a primary winding driven by the primary side circuit and electromagnetically coupled to the prim...

Embodiment 2

[0080] In the first embodiment described above, the objective function G is evaluated to provide a measure of the magnitude of the output voltage deviation or recovery time that occurs in response to changes in the load current of the SMPS 100 . However, the objective functions of the exemplary classes identified above may not provide an indication of whether a particular candidate value for the natural frequency of the zero results in an output voltage deviation that meets certain user requirements. For example, for an objective function of the form:

[0081] ,

[0082] where N = 1, which indicates that the time integral of the output voltage deviation is small, while the voltage V out (t) may have peak amplitudes that are unacceptably high for current applications. In these cases, the objective function described above will not provide an indication of peak voltage deviation and can ultimately lead to improperly set control law parameters. This and other forms of the ob...

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PUM

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Abstract

An apparatus (200) for tuning a feedback loop arranged to regulate an output voltage (V out ). The apparatus comprises a natural frequency estimator (210) arranged to determine a respective estimate of the natural frequency of each of two zeros in a transfer function corresponding to the model of the feedback loop. The natural frequency estimator (210) includes an output voltage deviation determination module (212), each point arranged as a plurality of points in the search space determines a deviation in the output voltage of the SMPS that occurs in response to a change in the load current of the SMPS, wherein the coordinates of each point correspond to candidate values ​​of the natural frequency of the zero point; and an objective function estimation module (214) arranged to evaluate the objective function using the determined deviation of the output voltage of the SMPS at each of the plurality of points, to A measurement of at least one of a magnitude of a corresponding output voltage deviation and a recovery time is obtained. The natural frequency estimator (210) is arranged to estimate, based on the estimated value of the objective function, the position of a minimum of the objective function in the search space, the position of the minimum corresponding to the natural frequency of the null. The apparatus further comprises a control law parameter calculator (220) arranged to calculate control law parameters for tuning the feedback loop based on the determined estimate of the natural frequency of the zero point and to tune the feedback loop of the feedback loop based on the calculated control law parameters. channel tuner (230).

Description

[0001] [Technical field] [0002] The present invention relates generally to the field of switched mode power supplies (sometimes referred to as switch mode power supplies or switching mode power supplies), and more particularly to determining a regulated switch mode power supply for tuning The value of the control law parameter of the compensation loop used in . [0003] [Background technique] [0004] Switched Mode Power Supplies (SMPS) are a well-known type of power converter with a wide range of applications due to their small size and weight and high efficiency, eg, in personal computers and portable electronic devices such as cell phones. SMPS achieves these advantages by switching one or more switching elements, such as power MOSFETs, at high frequencies (usually tens to hundreds of kHz), where the frequency or duty cycle of the switching is determined by a feedback loop (also widely known as A "compensation loop" or "feedback circuit") adjusts to convert the input volt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B13/04H02M3/156
CPCH02M3/156H02M1/0025H02M3/158
Inventor M.梅尔特格M.卡里斯森D.尼尔斯森A.拉斯森
Owner TELEFON AB LM ERICSSON (PUBL)