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Appliance control system with a zero crossing detecting circuit

A zero-crossing detection and control system technology, applied in electronic switches, electrical components, pulse technology, etc.

Inactive Publication Date: 2014-04-30
ELECTROLUX HOME PROD CORP NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The primary part receives the AC signal

Method used

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  • Appliance control system with a zero crossing detecting circuit
  • Appliance control system with a zero crossing detecting circuit
  • Appliance control system with a zero crossing detecting circuit

Examples

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Embodiment Construction

[0013] The present invention relates to electrical appliance control systems, and more particularly to electrical appliance control systems having a circuit for detecting the zero crossing of an AC signal. The present invention is now described with reference to the drawings, wherein like reference numerals are used to refer to like elements throughout. In the following description, for purposes of explanation, numerous specific details are given in order to provide a thorough understanding of the present invention. It is evident, however, that the invention may be practiced without these specific details. In addition, other embodiments of the invention are possible and the invention can be practiced and carried out in other ways than that described. The terms and expressions used in describing the present invention are used to facilitate the understanding of the present invention and should not be regarded as limiting.

[0014] As used herein, the terms "connected" and "con...

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Abstract

A control system includes a zero crossing detecting circuit for detecting a zero crossing of an AC signal. The circuit includes a transformer having a primary portion and a secondary portion. The primary portion receives the AC signal. The secondary portion comprises first and second terminals. The first terminal is biased at a first DC voltage level. An output switch is operatively connected to the second terminal and has an on state and an off state. The output switch selectively activates an output signal of the zero crossing detecting circuit according to an activation voltage level sensed by the output switch and corresponding to the zero crossing. While in the off state, the output switch is biased at a second DC voltage level. A voltage difference between the first and second DC voltage levels substantially equals the activation voltage level. A controller monitors the output signal and controls an operation based on the output signal.

Description

technical field [0001] The present invention relates to appliance control systems, and more particularly to appliance control systems having a circuit for detecting the zero crossing of an AC signal. Background technique [0002] It is known to detect the zero crossing of an AC waveform or signal. A zero crossing is the point at which an AC signal experiences zero potential (ie, 0VAC). [0003] It is also known to detect a zero-crossing point of a power waveform of an AC power source and to control various operations based on the zero-crossing point detection. For example, switching operations may be timed to substantially coincide with zero crossings of the AC power source. Contents of the invention [0004] According to one aspect of the present invention, a control system is provided, and the control system includes a zero-crossing detection circuit for detecting a zero-crossing of an AC signal. The zero-crossing detection circuit includes a transformer having a prim...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03K5/1536H03K17/13
CPCH03K17/13H03K5/1536
Inventor 罗伯特·C·哈里斯
Owner ELECTROLUX HOME PROD CORP NV