KR-102961257-B1 - Temperature compensation device for the oscillator

KR102961257B1KR 102961257 B1KR102961257 B1KR 102961257B1KR-102961257-B1

Abstract

The present invention relates to an oscillator temperature compensation device, wherein the temperature compensation device of the present invention comprises a sampling unit that generates a sample value sequence for a target digital signal synchronized with an oscillation signal of an oscillator, a zero detection unit that detects a zero time in which the sample value has a zero value from the sample value sequence, and a period determination unit that counts the number of pulses of the oscillation signal between adjacent zero times and compares it with a set value, and the period determination unit can control a change in the frequency of the oscillation signal of the oscillator when the number of pulses of the oscillation signal is inconsistent with the set value.

Inventors

정성모
한용태

Assignees

주식회사 크레파스테크놀러지스

Dates

Publication Date: 20260511
Application Date: 20240205

Claims (7)

In a temperature compensation device that receives a power line signal of a monitored target from a signal adjustment unit connected to a power line, An ADC that generates a target digital signal corresponding to the above power line signal; A sampling unit that generates a sequence of sample values for the target digital signal synchronized with the oscillation signal of the oscillator; A zero detection unit that detects a zero time in which the sample value has a zero value from the above sample value sequence; and It includes a period determination unit that counts the number of pulses of the oscillation signal between adjacent zero times and compares them with a set value, A temperature compensation device for controlling whether to supply power for overcurrent from the power line to the internal load according to the clock signal generated by the central processing unit based on the clock signal and the information regarding the difference between the number of pulses of the oscillation signal and the set value, and the difference, based on the temperature change and the difference generated by the central processing unit based on the oscillation signal.
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In paragraph 1, The above zero detection unit is a temperature compensation device that detects the zero time by determining whether a plurality of sequential sample values of the sample value sequence cross a predetermined zero value during the period of the oscillation signal.
In paragraph 1, The above-mentioned period determination unit is a temperature compensation device that controls the frequency change by controlling the charging current for generating the oscillation signal of the above-mentioned oscillator to be changed.
In paragraph 1, The above period determination unit is a temperature compensation device that controls the frequency change by controlling the reference voltage for generating the oscillation signal of the oscillator to be changed.
In paragraph 1, The above-mentioned period determination unit is a temperature compensation device that controls the frequency change by controlling the capacitance value of the capacitor of the charge/discharge circuit for generating the oscillation signal of the above-mentioned oscillator to change.
A temperature compensation method of a temperature compensation device that receives a power line signal of a monitored target from a signal adjustment unit connected to a power line, A step of generating a target digital signal corresponding to the above power line signal; A step of generating a sequence of sample values for the target digital signal synchronized with the oscillation signal of the oscillator; A step of detecting a zero time in which the sample value has a zero value from the above sample value sequence; A step of counting the number of pulses of the oscillation signal between adjacent zero times and comparing it with a set value; and The method includes a step of controlling the frequency change of the oscillation signal of the oscillation generator based on the difference between the number of pulses of the oscillation signal and the set value. A temperature compensation method for notifying a central processing unit of information regarding the above difference, and controlling whether to supply power for overcurrent from the power line to an internal load according to a clock signal generated by the central processing unit based on the oscillation signal and information regarding the above difference according to temperature change.

Description

Temperature compensation device for the oscillator The present invention relates to a device and method for compensating for errors caused by ambient environments, such as deviations and temperature of an oscillator that forms the basis of the operation of a digital circuit in a power line load monitoring device, etc. Generally, power line load monitoring devices such as circuit breakers are installed in distribution panels in homes, commercial buildings, factories, offices, department stores, etc., and cut off the power supply from the power supply line to the internal load in response to overcurrents that occur in cases of load-side leakage, wiring short circuits, arcs, etc. However, due to changes in seasons or the influence of the surrounding environment, the digital circuit within the power line load monitoring device experiences a problem in that the clock signal based on the frequency of the oscillator's output oscillation signal changes, causing malfunction in the power cutoff determination by the central processing unit (CPU). Consequently, proper power cutoff is not achieved, which can lead to failure of subsequent circuits. Reference may be made to relevant prior art, such as Patent Application No. 10-2010-0133260 (December 23, 2010). The accompanying drawings, included as part of the detailed description to aid in understanding the present invention, provide embodiments of the present invention and explain the technical concept of the present invention together with the detailed description. FIG. 1 is a drawing for explaining a monitoring device according to an embodiment of the present invention. FIG. 2 is a schematic circuit diagram of an oscillator according to one embodiment of the present invention. FIG. 3 is a flowchart for explaining the operation of a temperature compensation device according to one embodiment of the present invention. FIG. 4 is a diagram illustrating the operation of a zero detection unit according to an embodiment of the present invention. FIG. 5 is a diagram for explaining the operation of a period determination unit according to an embodiment of the present invention. Figure 6 is an example of waveforms for the normal and abnormal states of a power line signal of a monitored object. The present invention will be described in detail below with reference to the attached drawings. In this case, identical components in each drawing are denoted by the same reference numeral whenever possible. Furthermore, detailed descriptions of already known functions and/or configurations are omitted. The content disclosed below focuses on the parts necessary for understanding the operation according to various embodiments, and descriptions of elements that may obscure the gist of the explanation are omitted. Additionally, some components in the drawings may be exaggerated, omitted, or schematically depicted. The size of each component does not entirely reflect its actual size, and therefore, the contents described herein are not limited by the relative sizes or spacing of the components depicted in each drawing. In describing the embodiments of the present invention, detailed descriptions of known technologies related to the present invention are omitted if it is determined that such detailed descriptions may unnecessarily obscure the essence of the invention. Furthermore, the terms described below are defined in consideration of their functions within the present invention, and these may vary depending on the intentions or practices of the user or operator. Therefore, such definitions should be based on the content throughout this specification. Terms used in the detailed description are intended merely to describe the embodiments of the present invention and should not be limiting in any way. Unless explicitly stated otherwise, expressions in the singular form include the meaning of the plural form. In this description, expressions such as "include" or "comprise" are intended to refer to certain characteristics, numbers, steps, actions, elements, parts thereof, or combinations thereof, and should not be interpreted to exclude the existence or possibility of one or more other characteristics, numbers, steps, actions, elements, parts thereof, or combinations thereof other than those described. Additionally, terms such as first, second, etc., may be used to describe various components, but said components are not limited by said terms, and said terms are used only for the purpose of distinguishing one component from another. FIG. 1 is a drawing for explaining a monitoring device (100) according to one embodiment of the present invention. Referring to FIG. 1, a monitoring device (100) according to one embodiment of the present invention is a device for receiving and monitoring power line signals and may include a temperature compensation device (110), an oscillator (120), a central processing unit (130), a memory (140), and a signal input/output unit (150). The temperature compensation