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Responser for improving underdamped system

An under-damped, circuit technology, applied in the field of circuits that drive under-damped systems, to achieve the effect of fast set-up time

Active Publication Date: 2014-06-25
STMICROELECTRONICS SHANGHAI R&D
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004]Another technique used to reduce the magnitude of overshoot / undershoot in 2nd order systems is to extend the time to change the drive voltage, but this also increases the settling time to an unsuitable level

Method used

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  • Responser for improving underdamped system
  • Responser for improving underdamped system
  • Responser for improving underdamped system

Examples

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Embodiment Construction

[0022] figure 1 is a diagram of one embodiment of a spring-loaded electromagnetic lens assembly 10 including a focusable lens 12 . The lens assembly 10 may be a system such as a camera or video recorder ( figure 1 part not shown). An example of such a lens assembly is shown in US Patent No. 7,612,957, which is incorporated herein by reference.

[0023] In addition to the lens 12, the lens assembly 10 also includes a spring 14 for forcing the lens toward the reference position 16, and the lens assembly 10 also includes a coil 18 and at least one permanent magnet 20 ( figure 1 Two magnets are shown in ) that work together to force the lens away from this reference position. Since the skilled person can model the lens assembly 10 as a second-order spring-mass system, figure 1 A damper 22 is included to represent the level of damping inherent in the lens assembly - the damper is not an actual part of the lens assembly, but represents the combination of all sources of damp...

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Abstract

An embodiment of a circuit for driving an under-damped system comprises first and second signal generators. The first generator is operable to generate a first drive signal. And the second generator is operable to receive the first drive signal and a second drive signal, and to generate from the first and second drive signals a system drive signal having a first amplitude for a first duration and having a second amplitude after the first duration, the system drive signal operable to cause the under-damped system to operate in a substantially damped manner. Either or both of the first and second generators may be programmable such that one may adjust the response of any under-damped system by generating an appropriate drive signal instead of by physically modifying the system itself. In another embodiment, an under-damped system is caused to oscillate at a damped frequency having a first phase, and is also caused to oscillate at substantially the damped frequency having a second phase such that the oscillation at the first phase substantially cancels the oscillation at the second phase. Such embodiments may allow one to realize a faster settling time without slowing down the response time of an under-damped system.

Description

technical field [0001] The present invention relates to underdamped systems, and to circuits and methods for driving underdamped systems. Background technique [0002] The response of prior art underdamped systems is not suitable for certain applications. For example, a lens assembly with poor underdamped response is not suitable for use in compact digital camera applications because the assembly takes too long to move the lens between steady state focus positions. [0003] One technique for reducing the overshoot / undershoot and settling time of a second order system is to increase the damping level of the system. But increasing this damping level increases the power required, and this increased power may not be suitable for some applications, such as battery powered systems. [0004] Another technique used to reduce the magnitude of overshoot / undershoot in a second-order system is to extend the time to change the drive voltage, but this also increases the settling time t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03B1/00G02B7/04
CPCH04N5/232G02B7/08
Inventor 郜小茹赵建华欧伟
Owner STMICROELECTRONICS SHANGHAI R&D
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