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Circuit for leading-out trigger signal from AC line

A technology of AC line and AC power supply, which is applied to electrical components, cathode ray oscilloscopes, measurement leads/probes, etc., and can solve the problems of unwanted trigger timing and changes of optical isolators

Inactive Publication Date: 2006-07-19
TEKTRONIX INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Optoisolators have the same disadvantages as transformers in terms of requiring proper testing and approval, and in terms of cost
Additionally, opto-isolators exhibit undesired trigger timing variations as the magnitude of the AC line voltage varies

Method used

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  • Circuit for leading-out trigger signal from AC line
  • Circuit for leading-out trigger signal from AC line
  • Circuit for leading-out trigger signal from AC line

Examples

Experimental program
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Embodiment Construction

[0018] In the following drawings, elements labeled with similar numbers perform similar functions, for example, elements 105a, 205a, and 305a refer to figure 1 , Figure 2 and image 3 similar wires.

[0019] refer to figure 1 , the instrument 100 , which may be an oscilloscope, receives power from the AC line via a pair of leads 105 a , 105 b coupled to an internal power supply 120 . Internal power supply 120 provides operating power to the circuitry of instrument 100 . Each of a pair of sense lines comprising conductors 110a and 110b is non-conductively affixed to, and capacitively coupled to, a respective one of AC power line conductors 105a and 105b. Conductors 110a and 110b are referred to as signal sense conductors because they capacitively couple a signal representative of the AC line voltage to a processing channel comprising amplifier 130, low pass filter 140, another amplifier 150, and finally to A microprocessor (μp) 160 is controlled.

[0020] Amplifier 130 is ...

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PUM

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Abstract

An apparatus and method for deriving a signal from the AC line and conveying it to processing circuitry employs two wires each of which is non-conductively attached and capacitively coupled to a respective one of a two-wire AC power line. Each of the capacitive pick-offs is coupled to a respective input of a differential amplifier for amplification. Advantageously, because the output signal is a replica of the AC power line signal, the detection threshold can be set at or near zero volts. This makes the detection point insensitive to the amplitude variations of the AC power line. A further amplifier includes an amplitude limiting circuit to accommodate the wide range of AC line voltages which may be applied to the instrument.

Description

technical field [0001] This invention relates generally to the field of trigger circuits and, more particularly, to circuits for deriving trigger signals from AC power lines. Background technique [0002] Many electronic products perform functions that require synchronization with the AC line voltage that powers the product. One such product is an oscilloscope, and the functionality referred to is AC line triggering. [0003] An AC signal must be derived from the AC power line and delivered to the processing circuitry in order to perform the required functions. A transformer is usually used for this purpose. The transformer is insensitive as to whether said AC voltage is applied to one or both sides of a two-wire AC power system. This transformer provides the necessary safety isolation from the AC line and produces a signal identical to the AC line voltage. Unfortunately, because the transformer and associated circuitry couples to the AC power line, the transformer must ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03K5/15G01R13/20G01R1/07G01R13/32
CPCG01R13/32G01R1/07
Inventor F·Y·卡瓦巴塔
Owner TEKTRONIX INC
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