KR101087504B1 - Apparatus and method for measuring noise signal occurred from ac source of diode element - Google Patents

Abstract

PURPOSE: An AC source noise measurement apparatus of a diode device and a method thereof are provided to rapidly and efficiently measure AC source noise. CONSTITUTION: A voltage measurement part(200) measures the output voltage of a diode device. A voltage component calculation part(300) extracts the output voltage measured in the voltage measurement part three times per a predetermined time interval. The voltage component calculation part outputs an absolute value of the AC voltage component and DC voltage component of the output voltage.

Description

Apparatus and method for measuring AC power noise of diode device {APPARATUS AND METHOD FOR MEASURING NOISE SIGNAL OCCURRED FROM AC SOURCE OF DIODE ELEMENT}

The present invention relates to an AC power source noise measuring apparatus and method, and more particularly to an AC power source noise measuring apparatus and method of a diode element.

In a test device of a diode device such as a light emitting diode (LED), various noises may be included in the voltage measurement of the test device.

These noises include power source noise from AC power of the test equipment. Therefore, when the voltage by the forward bias is measured, not only the DC voltage component but also the AC voltage component is detected together. If a lot of such AC power noise appears in the test of the diode, it may be determined as a defective device.

In order to measure these jeonwonseong AC noise is conventional to obtain the DC voltage component V _dc to calculate the average voltage after the measurement voltage up to several tens of times. The conventional method will be described in more detail with reference to FIG. 1.

1 is a conceptual diagram illustrating an AC power noise measuring method of a diode device according to the prior art.

As shown in FIG. 1, the voltage is measured about 20 times or more from t ₁ to t _n . AC power is usually 110 V / 220 V with an effective voltage of 50 Hz / 60 Hz. Considering the frequency of the AC power supply, the period is about 16.7 msec / 20 msec. In order to measure at least the maximum and minimum values of the AC power noise, the DC voltage component V _dc was obtained by measuring the voltage of the test device for a time period of 8.35 msec / 10 msec or more corresponding to at least half of the period and calculating the average.

By the way, this conventional method takes a relatively long time to measure the DC voltage component V _dc and the AC voltage component and the number of times of measurement increases, there is a problem that the test of the diode device is complicated. Furthermore, it takes a lot of time to calculate the average using the measured voltage. Given the need to test a large number of diode devices in a short time, conventional AC-powered noise measurement methods are very inefficient.

An object of the present invention is to provide an AC power supply noise measuring device of a diode element.

Another object of the present invention is to provide a method for measuring AC power noise of a diode device.

An AC power source noise measuring apparatus for a diode element according to the object of the present invention described above includes a voltage measuring unit measuring an output voltage V (t) of a diode element, and the measured output voltage V (t) at a predetermined time interval? T. Extracted three times each time, the extracted voltages V (t ₁ ), V (t ₂ ) and V (t ₃ ) are respectively V _dc + V _ac sinwt ₁ , V _dc + V _ac sin (wt ₁ + Δt) and V The absolute value V _ac of the DC voltage component V _dc and the AC voltage component of the output voltages V (t ₁ ), V (t ₂ ) and V (t ₃ ) is calculated using _dc + V _ac sin (wt ₁ + 2Δt). It may be configured to include a voltage component calculating unit. Here, the voltage component calculator is configured to synchronize a timing generator for generating a signal at each predetermined time interval Δt and the measured output voltage V (t) in the order of the generated signal to obtain V (t _1). ), An analog-to-digital converter extracting and converting V (t ₂ ) and V (t ₃ ) into a digital signal, and converting the converted digital signals V (t ₁ ), V (t ₂ ) and V (t ₃ ). Three shift registers which are sequentially shifted and output in synchronization with the generated signal, and digital signals V (t ₁ ), V (t ₂ ) and V (t ₃ , respectively output by the three shift registers. And an unknown calculation circuit for calculating the DC voltage component V _dc and the absolute value V _ac of the AC voltage component. In this case, the diode device is preferably a light emitting diode device (LED).

According to another aspect of the present invention, there is provided a method for measuring AC power noise of a diode device, wherein a voltage measuring unit measures an output voltage V (t) of a diode device, and the analog-to-digital converter measures the measured output voltage V (t). ) And extracting V (t ₁ ), V (t ₂ ) and V (t ₃ ) by synchronizing the signal generated at a predetermined time interval Δt with a timing generator, and extracting V (t ₁ ) and V ( converting t ₂ ) and V (t ₃ ) into a digital signal, respectively, three shift registers sequentially shifting and outputting the converted digital signal in synchronization with a signal generated by the timing generator, and calculating an unknown value The circuit outputs the digital signals V (t ₁ ), V (t ₂ ) and V (t ₃ ) respectively V _dc + V _ac sinwt ₁ , V _dc + V _ac sin (wt ₁ + Δt) and V _dc + _{V ac sin (wt 1 + 2Δt} ) to the DC voltage component used that V _dc and ac voltage component of the absolute values V _ac It may be configured to include the step of calculating respectively. Herein, the digital signal V (t ₁ ), V (t ₂ ) and V (t ₃ ) output by the unknown calculation circuit are respectively V _dc + V _ac sinwt ₁ , V _dc + V _ac sin (wt ₁ + Calculating the absolute value V _ac of the DC voltage component V _dc and the AC voltage component by using Δt) and V _dc + V _ac sin (wt ₁ + 2Δt), respectively, is given by Equation (A ₁ * K ₄ -A ₂ *). The DC voltage components V _dc of V (t ₁ ), V (t ₂ ) and V (t ₃ ) are calculated by K ₂ ) / (K ₁ * K ₄ -K ₂ * K ₃ ), where A ₁ is V (t ₁ ) -V (t ₂ ), A ₂ is V (t ₁ ) -V (t ₃ ), K ₁ is 1-cos (wΔt), K ₂ is -sin (wΔt), K ₃ May be 1-cos (w2Δt), and K ₄ may be −sin (w2Δt).

According to the AC power noise measuring apparatus and method of the diode device as described above, the voltage of the diode device is measured only three times for a predetermined time interval regardless of the test time, and the DC voltage component V _dc and By calculating V _ac , which is an absolute value of the AC voltage component, there is an effect that the AC power noise can be measured quickly and efficiently. In terms of test efficiency of many diode devices, a test process that is significantly improved than before is provided.

1 is a conceptual diagram illustrating an AC power noise measuring method of a diode device according to the prior art.
2 is a block diagram of an AC power supply noise measuring apparatus of a diode device according to an exemplary embodiment of the present invention.
3 is a conceptual diagram illustrating an AC power noise measuring method of a diode device according to an exemplary embodiment of the present invention.
4 is a flowchart of a method of measuring AC power noise of a diode device according to an exemplary embodiment of the present invention.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention. Like reference numerals are used for like elements in describing each drawing.

The terms first, second, A, B, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

When a component is said to be "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that another component may exist in between. Should be. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that there is no other component in between.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram of an AC power supply noise measuring apparatus of a diode device according to an exemplary embodiment of the present invention.

Referring to FIG. 2, an AC power source noise measuring apparatus 100 (hereinafter, referred to as an “AC power source noise measuring apparatus”) of a diode element may be configured to include a voltage measuring unit 200 and a voltage component calculating unit 300. Can be.

Here, unlike the conventional method, the AC power supply noise measuring apparatus 100 measures the voltage of a diode element only three times, thereby calculating the power supply characteristics by calculating the DC voltage component V _dc of the diode element and V _ac , which is an absolute value of the AC voltage component by the power supply. Noise can be easily measured. Thus, in terms of test efficiency of many diode devices, a dramatically improved test process is implemented. Hereinafter, the detailed structure is demonstrated.

The voltage measuring unit 200 may be configured to measure the output voltage V (t) of the diode device. The voltage measuring unit 200 measures the analog output voltage V (t) of the diode device and provides the measured voltage to the voltage component calculating unit 300.

The voltage component calculator 300 extracts the output voltage V (t) measured by the voltage measuring unit 200 three times at predetermined time intervals Δt, and extracts the extracted voltages V (t ₁ ), V (t ₂ ), and V. The output voltage V (t ₁ ) using (t ₃ ) is V _dc + V _ac sinwt ₁ , V _dc + V _ac sin (wt ₁ + Δt) and V _dc + V _ac sin (wt ₁ + 2Δt), respectively. , V (t ₂ ) and V (t ₃ ) may be configured to calculate the absolute voltage V _ac of the DC voltage component V _dc and the AC voltage component.

Here, the voltage component calculating unit 300 extracts the output voltage V (t) three times for each predetermined time interval Δt, but is not particularly restricted for the time range of the predetermined time interval Δt.

Meanwhile, considering that the extracted voltages V (t ₁ ), V (t ₂ ) and V (t ₃ ) are output as alternating output voltages, mathematically, V _dc + V _ac sinwt ₁ , V _dc + V _ac sin, respectively. (wt ₁ + Δt) and V _dc + V _ac sin (wt ₁ + 2Δt). When referring to each mathematical expression of the output voltage, each voltage V (t ₁ ), V (t ₂ ) and V (t ₃ ) are measured values and are already known values, and the predetermined time interval Δt is also a predetermined value. to be. In addition, since the angular frequency w is approximately 60 Hz or 50 Hz, it is a known value. For each frequency, the AC power supplies 110V / 220V, 60Hz / 50Hz AC voltage signals, which is a known value.

Therefore, the unknown DC voltage component V _dc , the absolute value V _ac of the AC voltage component, and arbitrary measurement time t ₁ can be obtained by combining Equation 1, which is the following equation.

Accordingly, V _ac sinwt, which is an AC voltage component of the output voltage of the diode device, may be measured. As described above, the AC power supply noise measuring apparatus 100 according to the present invention can easily measure an AC voltage component in a remarkably short time than in the related art.

Hereinafter, the voltage component calculation operation will be described in more detail using the detailed configuration of the voltage component calculator 300.

The voltage calculator 300 includes a timing generator 310, an analog-digital converter 320, a shift register 330, and an unknown calculator 340. Can be configured. The shift register 330 may be configured to include a first shift register 331, a second shift register 332, and a third shift register 333. The unknown calculation circuit 340 may be configured to include a first subtractor 341, a second subtractor 342, and a DC voltage component calculating circuit 343.

The timing generator 310 may be configured to generate a signal every predetermined time interval? T. The timing generator 310 generates a pulse signal at a predetermined time interval Δt to the analog-to-digital converter 320, the first shift register 331, the second shift register 332, and the third shift register 333, respectively. Apply a pulse signal.

The analog-digital converter 320 receives the voltage signal V (t) measured from the voltage measuring unit 200, and synchronizes V (t ₁ ) and V (t) in the order of the signals generated by the timing generator 310. ₂ ) and V (t ₃ ) can be configured to extract and convert to a digital signal.

The shift register 330 sequentially shifts the digital signals V (t ₁ ), V (t ₂ ), and V (t ₃ ) converted by the analog-to-digital converter 320 in synchronization with the signals generated by the timing generator 310. Can be configured to output. In this case, the first shift register 331, the second shift register 332, and the third shift register 333 output the V (t ₃ ) by the first shift register 331 after three measurements. The shift register 332 outputs V (t ₂ ), and the third shift register 333 outputs V (t1).

The unknown calculation circuit 340 outputs the digital signals V (t ₃ ), V (t ₂ ), and V respectively output by the first shift register 331, the second shift register 332, and the third shift register 333. DC voltage component V _dc from (t ₁ ), absolute value V _ac of AC voltage component And calculate an initial voltage measurement time t ₁ . More specifically:

First, the first subtractor 341, a third receiving the V (t ₃₎ output from the V (t ₁₎ and the first shift register 331 is output from the shift register (333) A _2, i.e. V (t ₁ )-Calculates V (t ₃ ). The second subtractor 342 receives V (t ₃ ) output from the first shift register 331 and V (t ₁ ) output from the third shift register 333 and receives A ₁ , that is, V (t _1). )-Calculates V (t ₂ ). Meanwhile, the DC voltage component calculating circuit 343 may be configured to calculate the DC voltage component V _dc by Equation 2 below.

Where A ₁ is V (t ₁ ) -V (t ₂ ), A ₂ is V (t ₁ ) -V (t ₃ ), K ₁ is 1-cos (wΔt), and K ₂ is -sin (wΔt ), K ₃ is 1-cos (w2Δt), and K ₄ is -sin (w2Δt).

The DC voltage component calculating circuit 343 receives A ₁ corresponding to the output value of the second subtractor 342 and receives A ₂ corresponding to the output value of the first subtractor 341. And K ₁ , K ₂ , K _3, and K ₄ , which are easily derived by the known values of the angular frequency w and the time interval Δt, are input. In addition, V _dc , a DC voltage component, may be calculated according to the calculation of Equation 2. Similarly, the ac voltage component V _ac can also be calculated by a predetermined calculation circuit.

On the other hand, a diode device which is a test device may be an example of a light emitting diode device (LED).

3 is a conceptual diagram illustrating an AC power noise measuring method of a diode device according to an exemplary embodiment of the present invention.

Referring to FIG. 3, the AC power supply noise measuring apparatus 100 includes the voltages V (t ₁ ), V (t ₂ ), and V (t ₃ ) of a diode device as a test device at a predetermined time interval Δt at an arbitrary time t ₁ . ) Can be calculated to calculate the _ac voltage component, V _ac . In the related art, by measuring 20 or more times during at least T / 2 or more times of power supply noise, as in FIG. However, in the present invention, as shown in Figure 3 by measuring the voltage only three times at any time interval Δt at any time t ₁ , there is an advantage that can measure the power supply noise through a simple operation for a relatively short time.

4 is a flowchart of a method of measuring AC power noise of a diode device according to an exemplary embodiment of the present invention.

Hereinafter, the detailed structure is demonstrated.

The voltage measuring unit 200 measures the output voltage V (t) of the diode device (S110).

On the other hand, the timing generator 310 generates a synchronization signal every predetermined time interval Δt (S120).

Next, the analog-to-digital converter 320 synchronizes the measured output voltage V (t) with a signal generated at a predetermined time interval Δt in the timing generator 310 to V (t ₁ ), V (t ₂ ) and V. (t ₃ ) is extracted and converted into digital signals V (t ₁ ), V (t ₂ ) and V (t ₃ ) (S130).

The first shift register 331, the second shift register 332, and the third shift register 333 sequentially shift and output the converted digital signal in synchronization with the signal generated by the timing generator 310 ( S140).

Then, the unknown calculation circuit 340 determines that the digital signals V (t ₁ ), V (t ₂ ) and V (t ₃ ) output from the shift register 330 are respectively V _dc + V _ac sinwt ₁ , V _dc + The absolute value V _ac of the DC voltage component V _dc and the AC voltage component is calculated using V _ac sin (wt ₁ + Δt) and V _dc + V _ac sin (wt ₁ + 2Δt), respectively (S150). Here, the DC voltage component V _dc may be configured to be calculated by Equation 3 below.

Where A ₁ is V (t ₁ ) -V (t ₂ ), A ₂ is V (t ₁ ) -V (t ₃ ), K ₁ is 1-cos (wΔt), and K ₂ is -sin (wΔt ), K ₃ is 1-cos (w2Δt), and K ₄ is -sinw (w2Δt).

The method of measuring AC power noise of a diode device has an advantage of measuring AC power noise of a diode device only by measuring voltage three times in a short measurement time.

Although described with reference to the embodiments above, those skilled in the art will understand that the present invention can be variously modified and changed without departing from the spirit and scope of the invention as set forth in the claims below. Could be.

100: AC power noise measuring device
200: voltage measuring unit
300: voltage component calculating unit
310: timing generator
320: analog-to-digital converter
330: shift register
331: First shift register
332: second shift register
333: third shift register
340: unknown output circuit
341: first subtractor
342: second subtractor
343: DC voltage component output circuit

Claims (5)

A voltage measuring unit measuring an output voltage V (t) of the diode element;
The measured output voltage V (t) is extracted three times at predetermined time intervals Δt, and the extracted voltages V (t ₁ ), V (t ₂ ) and V (t ₃ ) are respectively V _dc + V _ac sinwt ₁ , Direct current of the output voltages V (t ₁ ), V (t ₂ ) and V (t ₃ ) using V _dc + V _ac sin (wt ₁ + Δt) and V _dc + V _ac sin (wt ₁ + 2Δt) An AC power source noise measuring device for a diode element comprising a voltage component calculating unit for calculating a voltage component V _dc and an absolute value V _ac of an AC voltage component. The method of claim 1, wherein the voltage component calculator,
A timing generator generating a signal every predetermined time interval Δt;
An analog-to-digital converter for synchronizing the measured output voltage V (t) in the order of the generated signal to extract V (t ₁ ), V (t ₂ ) and V (t ₃ ) and convert it into a digital signal;
Three shift registers for sequentially shifting and outputting the converted digital signals V (t ₁ ), V (t ₂ ) and V (t ₃ ) in synchronization with the generated signals;
An unknown calculation circuit for calculating the absolute value V _ac of the DC voltage component V _dc and the AC voltage component from the digital signals V (t ₁ ), V (t ₂ ) and V (t ₃ ) respectively output by the three shift registers is provided. AC power supply noise measuring device of a diode element comprising. The method of claim 1, wherein the diode element,
It is a light emitting diode element (LED), The AC power supply noise measuring apparatus of diode element. A voltage measuring unit measuring an output voltage V (t) of the diode device;
An analog-digital converter extracts V (t ₁ ), V (t ₂ ) and V (t ₃ ) by synchronizing the measured output voltage V (t) with a signal generated at a predetermined time interval Δt in a timing generator. ;
Converting the extracted V (t ₁ ), V (t ₂ ) and V (t ₃ ) into digital signals, respectively;
Three shift registers sequentially shifting and outputting the converted digital signal in synchronization with a signal generated by the timing generator;
The digital signal V (t ₁ ), V (t ₂ ) and V (t ₃ ) output by the unknown calculation circuit are respectively V _dc + V _ac sinwt ₁ , V _dc + V _ac sin (wt ₁ + Δt) and V Comprising a step of calculating the absolute value V _ac of the DC voltage component V _dc and the AC voltage component using _dc + V _ac sin (wt ₁ + 2Δt), respectively. The digital signal V (t ₁ ), V (t ₂ ) and V (t ₃ ) of the unknown calculation circuit are respectively V _dc + V _ac sinwt ₁ , V _dc + V _ac sin ( Calculating the absolute value V _ac of the DC voltage component V _dc and the AC voltage component using wt ₁ + Δt) and V _dc + V _ac sin (wt ₁ + 2Δt), respectively,
The DC voltage components V _dc of V (t ₁ ), V (t ₂ ) and V (t ₃ ) are calculated by the following equation,
V _dc = (A ₁ * K ₄ -A ₂ * K ₂ ) / (K ₁ * K ₄ -K ₂ * K ₃ ),
Where A ₁ is V (t ₁ ) -V (t ₂ ), A ₂ is V (t ₁ ) -V (t ₃ ), K ₁ is 1-cos (wΔt), and K ₂ is -sin (wΔt ), K ₃ is 1-cos (w2Δt), K ₄ is -sin (w2Δt) AC power noise measuring method of the diode element.

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