Dual-mode converter with linear and comparative feedback modes

Inactive Publication Date: 2006-08-08
LOCKHEED MARTIN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0010]This present invention solves the foregoing problems by providing a dual mode converter that converts power and that uses a feedback loop that operates in a linear mode during continuous input loads and that operates in a comparative mode during a step input load, with inherent stability.

Problems solved by technology

In many applications using conventional converters, linearity errors can cause distortion, which limits the performance of the system that relies on the converter.
For example, such distortion can decrease the operational bandwidth of the system which uses the converter.
In addition, many conventional converters use linear feedback which does not perform as well for step input loads as it does for continuous input loads.
Such converters often result in overshoot or undershoot output voltage in response to a discontinuous step load.
Many converters that are used to work with discontinuous step loads have slow transient response.
Also, many conventional converters require feedback loop compensation because such converters are inherently unstable.
The use of feedback loop compensation adds additional complexity and cost to the converter, and often requires adjustment of the compensation parameters when the converter is implemented into a specific application, thereby requiring additional setup time.

Method used

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  • Dual-mode converter with linear and comparative feedback modes
  • Dual-mode converter with linear and comparative feedback modes
  • Dual-mode converter with linear and comparative feedback modes

Examples

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Example

[0018]FIG. 1 shows a schematic of a converter according to one embodiment of the present invention. As seen in FIG. 1, converter 1 includes many common circuit components and is configured to provide a controlled dual-mode converter with a feedback loop that operates in a linear mode under continuous loads, and that operates in a comparative mode under non-continuous step loads.

[0019]Converter 1 receives input signal (load) 2 from a source such as a power supply. Input signal 2 is passed through resistor 3, which is a known type of resistor and may be of a desired resistance to step down the voltage level of input signal 2 to a desired level. Next, input signal 2 is branched to signal 4 which is passed through resistor 5 and split to input signal 9. Also on the path of signal 4 is capacitor 6 for filtering signal 4. The other side of capacitor 6 is grounded. As with resistor 3, resistor 5 and capacitor 6 are known types of components and may be of desired values in different embodiment

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PUM

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Abstract

A dual-mode converter for converting power from an input voltage level to an output voltage level, the dual-mode converter including an inductor section having an input side and an output side, the input side receiving an input signal and the output side outputting at least one output signal based on a power value of the input signal, a feedback loop section which receives a feedback signal from one or more of the at least one output signals, the feedback loop section including a first transistor, a second transistor and a comparator unit which outputs a comparator output signal based on a comparison of the feedback signal to a comparator reference signal, wherein the respective states of the first and second transistors configure the feedback loop section to function as either a linear mode or a comparator mode, a current mode controller unit which receives the input signal, the feedback signal, and a current sense signal representing a sensed current flowing through the input side of the inductor section, the current mode controller unit outputting an output control signal based on the received input signal, the feedback signal, and the current sense signal, and a control gate that enables the current flow through the input side of the inductor section when either the output control signal or the comparator output signal is greater than a predetermined threshold.

Description

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Claims

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Application Information

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Owner LOCKHEED MARTIN CORP
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