CN201607480U - Power Signal Test Set - Google Patents

Abstract

A power supply signal testing device receives a standard voltage level signal and a power supply voltage signal through a noise judging module to judge whether a voltage value represented by the power supply voltage signal is higher than a voltage value represented by the standard voltage level signal and is lower than the voltage value represented by the standard voltage level signal to exceed an allowable range, and displays a judged testing result through a provided output module, so that a user can accurately obtain a direct current ripple wave and alternating current noise measuring result in a visual and rapid mode, and the effects of reducing cost and improving yield are achieved at the same time.

Description

Power Signal Test Set

technical field

The utility model relates to a test device, in particular to a power signal test device.

Background technique

In the production process of the advanced electronics industry, the DC power supply of electronic devices such as motherboards may generate DC ripple (DC Ripple) superimposed with high-frequency AC noise (AC Noise).

As the electronic industry's requirements for low power consumption and scale down continue to increase, the voltage level of DC power used in electronic devices is also continuously reduced to meet the demands of low power consumption and performance improvement. However, since lowering the DC power supply voltage level may cause the noise tolerance of the electronic system to decrease, thereby increasing the probability that the electronic system cannot operate normally due to noise interference, the ever-decreasing power supply voltage level is of great importance to electronic device designers and Manufacturers are a serious challenge.

It can be seen that how to accurately measure the degree to which the DC power supply voltage of an electronic device is affected by noise is also a part that must be carefully considered during the production and design of an electronic device. At present, the voltage noise voltage of each DC power supply is usually measured. However, since a general motherboard may have dozens of important DC power supplies, if the above-mentioned measurement process is implemented for each DC power supply, it is bound to be a Quite a tedious process, but also takes a long time to measure.

Therefore, how to quickly determine whether the power signal meets the requirements is an urgent problem to be solved in the industry.

Contents of the invention

In order to solve the above problems, the purpose of this utility model is to provide a device capable of testing the power signal, which is used to accurately, conveniently and quickly test the noise of the power signal, quickly judge whether the signal source to be tested meets the requirements, and based on the noise The judgment result of the judgment module is displayed.

In order to achieve the above and other purposes, the utility model provides a power signal testing device, including: a standard voltage signal source, providing a preset standard voltage value, and outputting a corresponding standard voltage level signal; a power input module to be tested, connected to Input the power supply voltage signal to be tested; the noise determination module is electrically connected to the standard voltage signal source and the power input module to be tested, receives the standard voltage level signal and the power supply voltage signal, and outputs an indication signal accordingly, the noise The judging module includes: a first judging module, which receives the standard voltage level signal and converts it into a first preset value, compares the power supply voltage signal with the first preset value, and outputs a first indication signal; a second judging module, receives the Convert the standard voltage level signal to a second preset value, compare the power supply voltage signal with the second preset value, and output a second indication signal; a processing module, coupled to the first judgment module and the second judgment module, receives The first indication signal and the second indication signal output a judging signal; and the output module is electrically connected to the noise judging module, receives the judging signal and makes a corresponding display.

In one embodiment of the present invention, the first judging module includes: a first converting unit, coupled to the standard voltage signal source, receiving the standard voltage level signal, and outputting the first preset value; and a first comparing unit , coupling the power input module under test and the first conversion unit, comparing the power voltage signal under test with the first preset value, and outputting the first indication signal. The second judging module includes: a second converting unit, coupled to the standard voltage signal source, receiving the standard voltage level signal, and outputting the second preset value; and a second comparing unit, coupled to the power input module to be tested and The second conversion unit compares the power voltage signal to be tested with the second preset value, and outputs the second indication signal.

In addition, the first preset value is not equal to the second preset value, wherein one of the first preset value and the second preset value is an acceptable upper limit value of the power supply voltage to be tested, and the other is Acceptable lower limit of the power supply voltage to be tested.

In another embodiment of the present utility model, the output module includes: a first indicator and a second indicator, respectively coupled to the noise determination module, and selectively enabling the first indicator or the second indicator according to different determination signals. the second indicator. The first indicator and the second indicator are indicator lights of different colors. The processing module is an AND gate or an OR gate.

In summary, the power signal testing device of the present utility model can improve various cost and yield problems caused by the current DC ripple and AC noise measurement methods, in addition to greatly saving measurement time, eliminating ambient noise and The impact of various instrument noises on the measurement results can also greatly reduce the damage to the motherboard or electronic devices during the test, thus providing users with an intuitive and fast way to accurately obtain the amount of DC ripple and AC noise Test results, and at the same time achieve the effect of reducing costs and improving yield.

Description of drawings

FIG. 1 is a schematic diagram of the internal structure of an embodiment of a power signal testing device of the present invention.

Description of main component symbols

1 standard voltage signal source

2 Power input module to be tested

3 Noise judgment module

4 output module

10 standard voltage input terminal

20 Power supply voltage input terminal

30 Digital to Analog Converter

30a The first judgment module

30b The second judgment module

40 first conversion unit

50 second conversion unit

60 The first comparison unit

70 Second comparison unit

80 processing modules

90r first indicator

90g Second indicator

100 power signal test device

V _cc standard voltage level signal

V _in supply voltage signal

V _A standard voltage signal

V _A1 first preset value

V _A2 second preset value

V _C1 output signal

V _C2 output signal

V _i1 first input terminal

V _i2 second input terminal

V _i1 ' first input terminal

V _i1 ' second input terminal

Detailed ways

The following embodiments are described in sufficient detail so that those skilled in the art can manufacture and use the utility model. It should be understood that other embodiments can be understood based on this disclosure, and the device or changes on the device can be made without departing from the utility model. under a new category.

It should be noted here that, in order to avoid obscuring the focus of the present invention, some existing electrical connections (such as power supply or voltage signal) and basic circuit elements will not be described in detail.

Furthermore, the drawings used to illustrate the embodiments of the present utility model, some common features in different embodiments, for clarity and ease of illustration, description and understanding, similar or identical features will be described with the same reference numerals.

Referring to FIG. 1 , it is a schematic diagram of an internal structure of an embodiment of a power signal testing device 100 of the present invention. The power signal testing device 100 of this embodiment includes four parts: a standard voltage signal source 1 , a power input module 2 to be tested, a noise determination module 3 and an output module 4 .

As shown in FIG. 1 , the standard voltage signal source 1 includes a standard voltage input terminal 10, which provides the user with a direct input of the corresponding standard voltage level signal V _cc according to different test requirements, and the standard voltage level signal V cc input by the user _cc is output in the form of a digital signal or an analog signal, and in this embodiment, a digital signal is used as the output form. In addition, the standard voltage signal source 1 may also optionally include buttons or setting devices (not shown) for inputting voltage values. The power input module 2 to be tested includes a power voltage input terminal 20 for providing a power voltage signal V _in to be tested. Both the standard voltage signal source 1 and the under-test power input module 2 are electrically connected to the noise determination module 3 .

The noise determination module 3 includes a digital-to-analog converter (DAC) 30 , a first determination module 30 a , a second determination module 30 b and a processing module 80 .

The first judging module 30 a includes a first converting unit 40 and a first comparing unit 60 . The second judging module 30 b includes a second converting unit 50 and a second comparing unit 70 .

Since the standard voltage level signal V _cc in this embodiment is a digital signal, it must be converted by a digital-to-analog converter 30 to output an analog standard voltage signal V _A . The digital-to-analog converter 30 is used to receive the standard voltage level signal V _cc transmitted from the standard voltage input terminal 10 , and convert the received digital signal into a standard voltage signal V _A , and then output the standard voltage signal V _A to the first conversion unit 40 and the second conversion unit 50 . It should be noted that, since the design and manufacturing costs of digital-to-analog converters of different specifications may vary greatly, in order to meet the requirements of measurement accuracy, the digital-to-analog converter 30 can be measured according to the required measurement accuracy. Digital-to-analog converters with different resolutions are used.

The first conversion unit 40 can amplify the received analog voltage signal with a specific amplification factor. In this embodiment, the voltage amplification factor of the first conversion unit 40 is 1.05 times, but it is not limited thereto. That is, the first conversion unit 40 can increase the voltage level of the received analog voltage signal by 5%, and output the increased voltage level as the first preset value V _A1 . Similarly, the second conversion unit 50 can amplify the received analog voltage signal with a specific amplification factor. In this embodiment, the voltage amplification factor of the second conversion unit 50 is 0.95 times, but it is not limited thereto. That is, the second conversion unit 50 can reduce the voltage level of the received analog voltage signal by 5%, and output the reduced voltage level as the second preset value V _A2 .

Both the first comparison unit 60 and the second comparison unit 70 are analog voltage comparators and have two analog voltage input terminals for outputting corresponding digital signal outputs according to the voltage comparison results of the two input signals. The first input terminal V _i1 and the second input terminal V _i2 of the first comparison unit 60 are respectively electrically connected to the power supply voltage input terminal 20 and the output terminal of the first conversion unit 40 for receiving the power supply voltage signal V to be tested. _in and the first preset value V _A1 , then compare the voltage level V _in received by the input terminals V _i1 and V _i2 with the first preset value V A1 , and output V _C1 according to the comparison result, where _{V C1 is} A digital signal of logic 1 or 0. Similarly, the first input terminal V _i1 ′ and the second input terminal V _i2 ′ of the second comparison unit 70 are respectively electrically connected to the power supply voltage input terminal 20 and the output terminal of the second conversion unit 50 for receiving The power supply voltage signal V _in and the second preset value V _A2 , then compare the voltage level V _in received by the input terminals V _i1 ' and V _i2 ' with the second preset value V _A2 , and output according to the comparison result V _C2 , where V _C2 is also a digital signal of logic 1 or 0. In this embodiment, the processing module 80 is an OR gate, which is electrically connected to the first comparison unit 60 and the second comparison unit 70, and is used to receive the output signals V _C1 and V _C2 , and according to the output signals V _C1 and V The Boolean relationship between _C2 outputs a corresponding logic 1 or 0 signal.

What needs to be particularly mentioned here is that, in a preferred embodiment of the present invention, the processing module 80 can be replaced with an AND gate (AND gate), depending on the configuration of the input terminals of the first comparison unit 60 and the second comparison unit 70 depends. For example, when the voltage signal received by the first input terminal V _i1 of the first comparison unit 60 is greater than the voltage signal received by the second input terminal V _i2 , the output V _C1 will be a logic 1 potential, and the processing module 80 It must be set as an OR gate to reflect that the power supply voltage signal V _in is greater than one hundred and five percent of the standard voltage level signal V _cc . Therefore, the logical operation of the processing module 80 may be changed depending on the testing function and requirements of the circuit.

The output module 4 includes a first indicator 90r and a second indicator 90g, and the indicators 90r and 90g are electrically connected to the processing module 80 for receiving output signals thereof. When the processing module 80 outputs a logic 0 signal, the second indicator 90g is enabled. Relatively, when the processing module 80 outputs a logic 1 signal, the first indicator 90r is enabled. In addition, the output module 4 may also optionally include a timing device or a timing circuit (not shown), which is used to record the length of time that the second indicator 90g is continuously enabled. Furthermore, the first indicator 90r and the second indicator 90g can be, for example but not limited to, red or green LEDs, that is, display units or light emitting elements capable of displaying output signal states and having different display colors.

To sum up, the power signal testing device 100 allows the user to directly input the corresponding standard voltage level signal V _cc according to different test requirements, and at the same time input the power voltage signal V _in to be tested, and then through the digital-to-analog converter 30 The standard voltage level signal V _cc is converted into a standard voltage signal V _A . Next, the received standard voltage signal V _A is amplified by a specific amplification factor through the first conversion unit 40 and the second conversion unit 50 respectively to generate output voltages V _A1 and V _A2 . The first comparison unit 60 compares the power voltage signal _Vin with the output voltage V _A1 ; the second comparison unit 70 compares the power voltage signal _Vin with the output voltage V _A2 . The first comparison unit 60 and the second comparison unit 70 respectively output the comparison results to the processing module 80, and then the processing module 80 outputs the corresponding logic 1 or 0 signal according to the Boolean function relationship between the output signals V _C1 and V _C2 . The logic signal output by the processing module 80 can respectively control the enabling of the first indicator 90r and the second indicator 90g according to the display requirement of the measurement.

As mentioned above, the present invention provides a power signal testing device 100 for measuring DC ripple and AC noise. Firstly, a standard voltage signal V _cc and a power supply voltage signal V _in to be tested are input. Next, judge whether the voltage value represented by the power supply voltage signal _Vin to be tested is greater than 105 percent of the voltage value represented by the standard voltage signal V _cc , if so, enable the first indicator 90r and then end the test Flow process; if not, then judge whether the voltage value represented by the power supply voltage signal V _in to be tested is less than ninety-five percent of the voltage value represented by the standard voltage signal V _cc , if so, enable the first indicator 90r and Then end the test process; if not, enable the second indicator 90g. Then judge the length of time that the second indicator 90g is enabled, and when the second indicator 90g is continuously enabled for a preset time, such as one minute, the test process ends.

Therefore, through the power signal testing device of the present utility model, various cost and yield problems caused by the current DC ripple and AC noise measurement methods can be improved, in addition to greatly saving measurement time, eliminating ambient noise and various instruments The impact of noise on the measurement results can also greatly reduce the damage caused to the motherboard or electronic devices during the test, thus providing users with an intuitive and fast way to accurately obtain the measurement results of DC ripple and AC noise, And at the same time achieve the effect of reducing cost and improving yield.

The above-mentioned embodiments only illustrate the principles and effects of the present utility model, but are not intended to limit the present utility model. Anyone skilled in the art can modify and change the above-mentioned embodiments without departing from the spirit and scope of the utility model. Therefore, the protection scope of the utility model shall be as listed in the claims.

Claims (8)

1. A power signal tester, characterized in that the power signal tester comprises: Standard voltage signal source, providing a preset standard voltage value and outputting a corresponding standard voltage level signal; The power input module to be tested is connected to the power voltage signal to be tested; The noise determination module is electrically connected to the standard voltage signal source and the power input module to be tested, receives the standard voltage level signal and the power supply voltage signal, and outputs an indication signal accordingly. The noise determination module includes: The first judging module receives the standard voltage level signal and converts it into a first preset value, compares the power supply voltage signal with the first preset value, and outputs a first indication signal; The second judging module receives the standard voltage level signal and converts it into a second preset value, compares the power supply voltage signal with the second preset value, and outputs a second indication signal; A processing module, coupled to the first judgment module and the second judgment module, receives the first indication signal and the second indication signal, and outputs a judgment signal; and The output module is electrically connected to the noise judging module, receives the judging signal and makes a corresponding display. 2. The power signal testing device according to claim 1, wherein the first judging module comprises: a first conversion unit, coupled to the standard voltage signal source, receives the standard voltage level signal, and outputs the first preset value; and The first comparison unit is coupled to the power input module under test and the first conversion unit, compares the power voltage signal under test with the first preset value, and outputs the first indication signal. 3. The power signal testing device according to claim 1, wherein the second judging module comprises: a second conversion unit, coupled to the standard voltage signal source, receives the standard voltage level signal, and outputs the second preset value; and The second comparison unit is coupled to the power input module under test and the second conversion unit, compares the power voltage signal under test with the second preset value, and outputs the second indication signal. 4. The power signal testing device according to claim 1, wherein the first preset value is not equal to the second preset value, wherein one of the first preset value and the second preset value One is the acceptable upper limit value of the power supply voltage to be tested, and the other is the acceptable lower limit value of the power supply voltage to be tested. 5. The power signal testing device according to claim 1, wherein the output module comprises: a first indicator and a second indicator, which are respectively coupled to the noise judgment module, and are selectively used according to different judgment signals either the first indicator or the second indicator. 6. The power signal testing device according to claim 1, wherein the first indicator and the second indicator are indicator lights of different colors. 7. The power signal testing device according to claim 1, wherein the processing module is an AND gate. 8. The power signal testing device according to claim 1, wherein the processing module is an OR gate.

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