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Electric amplifier and method for the control thereof

A technology of amplifiers and regulators, applied in instruments, measuring magnetic variables, measuring devices, etc., can solve problems such as overload, component damage, and excessive control of regulators

Inactive Publication Date: 2007-05-23
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Positive feedback can be caused by the controller itself, for example in an excessively high controller gain and is reflected in a continuously increasing amplitude and frequency of the controller signal, with the result that the controller overcontrols
Due to the controller signal oscillating in the controller positive feedback, components in the controller can be damaged or overloaded due to wide amplitudes in the increased frequency

Method used

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  • Electric amplifier and method for the control thereof
  • Electric amplifier and method for the control thereof
  • Electric amplifier and method for the control thereof

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Embodiment Construction

[0033] Figure 1 shows a block diagram of an electric amplifier EV with a final stage ES, which is connected to a voltage source SQ with a supply voltage U_0, and this final stage generates an electric device L (here Expressed by the coil GS) output voltage U_out. In addition, the amplifier EV includes a regulator R. In order to control the amplifier EV and fine-tune the output voltage U_out, the amplifier EV is compared with the current rating SOLL according to the current measured value IST determined from the output signal of the final stage ES using the current measuring device SME A regulator signal RS is set, and the regulator signal RS is provided to the controller SE. The controller SE generates control signals AS1, AS2, AS3, AS4 by modulating the pulse width of the regulator signal RS, so as to control the switching on and off of the bridge circuit BS in the final stage ES for setting the output voltage U_out.

[0034] In addition, the electric amplifier EV also has a moni...

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Abstract

The invention relates to a method for controlling an electric amplifier (EV), wherein a control signal (RS) controlling a final stage (ES) of the amplifier (EV) is monitored, said control signal (RS) being adjusted according to an output signal (U out) of the final stage (ES). According to the invention, the control signal (RS) is compared to a reference signal (REFS) and when an amplitude value (AW) and / or a period duration value (PW) of the reference signal (RS) exceeds an amplitude threshold value (REF O, REF U) and a period duration threshold value (PGW) of the reference signal (REFS), the final stage (ES) is controlled in a blocked manner on the input side.

Description

Technical field [0001] The invention relates to a method for controlling an electric amplifier, in which a regulator signal controlling the final stage of the amplifier is monitored. The invention also relates to an amplifier operating according to the method. Here, an amplifier is understood in particular to mean, for example, a gradient amplifier for nuclear spin tomography devices. Background technique [0002] Such electric amplifiers are often constructed in two stages. In the first stage, the intermediate circuit generator or power supply device generates a supply voltage of medium precision. The power supply device supplies power to the final stage, the task of which is to generate an output signal with the desired characteristics. According to different requirements, the output signal can have a voltage that is increased relative to the supply voltage, and can have a constant or time-changing signal change that can be specified according to different applications. [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/385
CPCG01R33/3852
Inventor 赫尔穆特·伦兹
Owner SIEMENS AG