Controlling Switch Mode Power Supplies to Maximize Power Efficiency

A switch-mode power supply and control circuit technology, which is used in the conversion of DC power input to DC power output, control/regulation systems, and output power conversion devices, etc.

Inactive Publication Date: 2018-02-27
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] All of the above control strategies have drawbacks in terms of output voltage tolerance, transient response and power efficiency

Method used

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  • Controlling Switch Mode Power Supplies to Maximize Power Efficiency
  • Controlling Switch Mode Power Supplies to Maximize Power Efficiency
  • Controlling Switch Mode Power Supplies to Maximize Power Efficiency

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Embodiment Construction

[0039] As will be described in detail below, the present invention proposes a control strategy for a switch mode power supply. The control strategy maintains high power efficiency and still improves output voltage response in the face of voltage transients at the input or load current transients at the output.

[0040] figure 1 A top-level block diagram of a switched-mode power supply (SMPS) 100 and a control circuit 200 is shown. The control circuit 200 is arranged to receive an input voltage V indicative of the SMPS 100 in and the output voltage V out signal of. These signals may include analog signals of the voltage itself or digital signals containing information defining the voltage value measured by a measuring device (not shown). Based on the signal indicative of the SMPS output voltage or the signal indicative of the SMPS input voltage and the signal indicative of the output SMPS voltage (depending on the mode of operation discussed further below), the control circ...

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Abstract

A control circuit (200) operable to generate a control signal (D) to control a duty cycle of a switched mode power supply (100) is provided. The control circuit (200) includes a reference voltage generator (201) operable in a first mode to generate a predetermined reference signal (VRdes) and operable in a second mode to receive an input indicative of said switched mode power supply (100) voltage (Vin) and generate a variable reference signal (VRvar) dependent on said input voltage (Vin), the reference voltage generator (201) is configured to operate in a first mode when the input voltage (Vin) exceeds a threshold, And it operates in the second mode when the input voltage (Vin) is equal to or less than the threshold. The control circuit (200) also includes an error signal generator (202) operable to receive a signal indicative of an output voltage (Vout) of the switched mode power supply (100) and operable to generate a reference signal based on the reference voltage generator (VR; VRvar, VRdes) and an error signal (VE) is generated based on the output voltage (Vout). The control circuit (200) also includes a duty cycle control signal generator (204) operable to generate a control signal related to the error signal (VE) to control the duty cycle of the switched mode power supply (100).

Description

technical field [0001] The present invention relates generally to the field of switched mode power supplies, and more particularly to the control of the duty cycle of switched mode power supplies. Background technique [0002] A Switch Mode Power Supply (SMPS) is a well known type of power converter that has a diverse range of applications due to its small size, light weight and high efficiency. For example, SMPSs are widely used in personal computers and portable electronic devices, such as cellular telephones. SMPSs achieve these advantages by switching switching elements such as power MOSFETs at high frequencies (typically tens to hundreds of kHz), where the frequency or duty cycle of the switching defines the efficiency with which the input voltage is converted to the desired output voltage. [0003] In most SMPS topologies, the output voltage V out with input voltage V in Proportional. [0004] Equation 1 [0005] In Equation 1 above, D is the duty cycle of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/156H02M3/335H02M1/00
CPCH02M3/156H02M3/33507H02M1/0022H02M1/0003H02M1/0025H02M3/33592
Inventor M.卡尔松O.佩尔松
Owner TELEFON AB LM ERICSSON (PUBL)
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