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The method of determining the loss of dc-dc converter and its dc-dc converter

A DC-DC and converter technology, applied in the field of switching power supply, can solve problems such as unstable power factor value, measurement error, and inability to widely apply power reduction methods

Active Publication Date: 2016-05-18
ROHM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this technique does not use sensors, the duty cycle signal is affected by many changing parameters such as input voltage and power stage gain, so it is not suitable for situations where absolute power estimation is required
Use of this method to optimize power converter power consumption is limited
Although this method is suitable for dead time applications; it is not widely applicable to power reduction methods
In addition, power factor values ​​are often highly unstable and subject to measurement error

Method used

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  • The method of determining the loss of dc-dc converter and its dc-dc converter
  • The method of determining the loss of dc-dc converter and its dc-dc converter
  • The method of determining the loss of dc-dc converter and its dc-dc converter

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Embodiment Construction

[0023] refer now figure 2 Buck converter to describe the method; of course, the method can also be used for other types of converters. The Buck converter uses a switch to convert an input voltage V in Connect / disconnect with an inductor L. The inductor stores energy from the input voltage in the form of magnetic energy and provides it to an output. Use a capacitor C to provide the output V o clipping. The ratio of the input voltage to the output voltage depends on the duty cycle d of the switch, which is normally adjusted to maintain a constant output voltage. For this purpose, the output voltage is sensed, for example, by an analog-to-digital converter ADC and compared with a desired output voltage r, which is then fed back through a feedback loop as a control signal to adjust the duty cycle, the The feedback loop includes, for example, an integrator Int. This is a technique familiar in the art.

[0024] The present application relies on an auto-zero circuit placed in...

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Abstract

This application provides a method to calculate the loss of a DC-DC converter without measuring the input current, and uses this algorithm to determine the optimal switching point between single-phase mode and two-phase mode in a two-phase DC-DC power supply.

Description

field of invention [0001] This application relates to switched mode power supplies, and in particular to a method of measuring losses and currents in a DC-DC converter, using these measures to control the DC-DC converter. Background technique [0002] Switching power supplies have advantages over linear power supplies, for example, in the ability to pass voltages or supply negative voltages, and more importantly, their high efficiency. [0003] The efficiency of a power converter is an extremely important metric because inefficiency leads directly to power dissipation, which in turn generates heat and, in battery-operated devices, shortens battery life. [0004] Various power reduction methods have been developed to improve the efficiency of the converter in different operating modes. Examples of these power reduction methods include phase shedding, pulse frequency modulation, and pulse omitting. In the phase-changing mode, for example, there are two phases, the first work...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/156H02M3/157H02M3/335
CPCH02M3/156H02M3/157H02M3/33507H02M3/33515G05F1/62
Inventor 安东尼·凯利
Owner ROHM CO LTD