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Switching arrangement and method for monitoring ac signals

A technology of alternating voltage, circuit device, applied in the direction of output power conversion device, measuring device, measuring current/voltage, etc.

Active Publication Date: 2020-05-01
EATON INTELLIGENT POWER LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, only one phase can be monitored by means of this method

Method used

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  • Switching arrangement and method for monitoring ac signals
  • Switching arrangement and method for monitoring ac signals
  • Switching arrangement and method for monitoring ac signals

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Embodiment Construction

[0078] exist Figure 1A In principle, a circuit arrangement is shown which enables the processing of an AC input signal originating from any phase of the supply network. A second output signal or zero-crossing signal S2 is generated from the supply voltage of the device by means of the zero-crossing detector 10 . Which phase is implemented from basically has no effect. three phases Figure 1A Called La, Lb and Lc in. Here, this can be in any order L1, L2, L3 or L2, L3, L1 or L3, L1, L2. N is neutral. Zero-crossing detector 10 at Figure 1A is constructed in the form of a comparator which compares the supply voltage with ground potential GND (zero reference) or approximately ground potential. In this way, a zero crossing of the supply voltage can be detected. For example, according to Figure 1A The zero-crossing detector 10 is connected to La. The supply voltage on phase La is firstly rectified, and then it is fed into zero point detector 10 . this is in Figure 1A is sc...

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Abstract

The invention relates to a switching arrangement for monitoring AC signals (I_k), said arrangement comprising: a comparator (8) to which a signal (I_k) to be monitored can be fed for comparison with adefined amplitude threshold value (A) so that a first output signal (S1) can be generated; a zero crossing detector (10) to which a reference signal can be fed so that a second output signal (S2) canbe generated; downstream first and second timers (12a, 12b) for generating first and second clock signals (S3a, S3b), wherein the second clock signal (S3b) differs from the first clock signal (S3a);and first and second edge-triggered flip-flops (14a, 14b). The output of the comparator (8) is connected both to a level-triggered input (D) of the first flip-flop (14a) and to a level-triggered inputof the second flip-flop (14b). An output of the first timer (12a) and an output of the second timer (12b) are both connected to an edge-triggered input of the flip-flop (14a, 14b) such that first andsecond status signals (S4a, S4b) are generated at outputs of the flip-flops (14a, 14b).

Description

technical field [0001] The invention relates to a circuit arrangement and a method for monitoring a signal in the form of an alternating voltage (AC), in particular an electronic controller, such as a programmable logic controller (SPS), and a corresponding software product. ) or an AC input signal to a programmable logic relay or an AC input signal or input voltage to a similar device. Background technique [0002] Small programmable controllers, such as SPS or programmable logic relays, are usually available in variants that are supplied with an alternating voltage (mostly in the range of 85 to 264 VAC) and have corresponding AC inputs. In order to identify the AC input signal for such a controller, the distinction or identification of certain limit values ​​or thresholds is absolutely necessary. Accurate and fast detection of this defined threshold is particularly advantageous for different applications. [0003] A conventional approach, in order to provide an AC input ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/04G01R19/25
CPCG01R19/04G01R19/2513G05B19/05H02M1/14H02M7/155
Inventor H·库卡
Owner EATON INTELLIGENT POWER LTD
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