Method and arrangement for suppressing noise signals in a load supplied with direct voltage by a final controller
First Claim
1. A method of suppressing noise having an alternating voltage component in a load supplied with a direct voltage signal by way of a control loop including a final controller connected to the load, comprising:
- forming a connection between the final controller and the load by way of only an ohmic resistor, the signal at the output of the final controller containing an alternating voltage component of the noise;
forming a signal proportional to the alternating voltage component of the noise in the load in a branch circuit separate from the control loop supplying the load; and
feeding the proportional signal in phase opposition to the signal appearing at the output of the final controller ahead of the ohmic resistor with an amplitude corresponding to the amplitude of the alternating voltage component of the noise dropped across the ohmic resistor.
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Abstract
A method and arrangement for suppressing noise having an alternating voltage component in a load supplied with a direct voltage signal by way of a control loop including a final controller connected to the load. The final controller is connected to the load by way of only an ohmic resistor. The signal at the output of the final controller contains an alternating voltage component of the noise. A signal proportional to the alternating voltage component of the noise in the load is formed in a branch circuit separate from the control loop supplying the load. The proportional signal is fed in phase opposition to the signal appearing at the output of the final controller ahead of the ohmic resistor with an amplitude corresponding to the amplitude of the alternating voltage component of the noise dropped across the ohmic resistor.
10 Citations
5 Claims
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1. A method of suppressing noise having an alternating voltage component in a load supplied with a direct voltage signal by way of a control loop including a final controller connected to the load, comprising:
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forming a connection between the final controller and the load by way of only an ohmic resistor, the signal at the output of the final controller containing an alternating voltage component of the noise; forming a signal proportional to the alternating voltage component of the noise in the load in a branch circuit separate from the control loop supplying the load; and feeding the proportional signal in phase opposition to the signal appearing at the output of the final controller ahead of the ohmic resistor with an amplitude corresponding to the amplitude of the alternating voltage component of the noise dropped across the ohmic resistor.
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2. An arrangement for suppressing noise having an alternating voltage component in a load having first and second terminals, comprising:
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a voltage source supplying a direct voltage; a control loop including a final controller connected between said voltage source and the first terminal of the load for supplying the load with a direct voltage signal at the output of said final controller; an ohmic resistor forming the sole connecting element between the output of said final controller and the first terminal of the load; a capacitive sensor connected with the second terminal of the load for developing a voltage proportional to an alternating voltage component of noise in the load; a differential amplifier having an inverting input connected with said capacitive sensor and an output connected to the output of said final controller ahead of said ohmic resistor, said differential amplifier producing an alternating voltage at its output which is in phase opposition with, and corresponding in amplitude to, an alternating voltage component of the noise across said ohmic resistor. - View Dependent Claims (3, 4, 5)
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Specification