CN220438460U - Data acquisition module and test system for DC-DC output ripple noise measurement - Google Patents
Data acquisition module and test system for DC-DC output ripple noise measurement Download PDFInfo
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- CN220438460U CN220438460U CN202321821666.4U CN202321821666U CN220438460U CN 220438460 U CN220438460 U CN 220438460U CN 202321821666 U CN202321821666 U CN 202321821666U CN 220438460 U CN220438460 U CN 220438460U
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- 238000012360 testing method Methods 0.000 title claims abstract description 22
- 238000005259 measurement Methods 0.000 title claims abstract description 21
- 230000003044 adaptive effect Effects 0.000 claims abstract description 7
- 239000003990 capacitor Substances 0.000 claims description 13
- 238000012545 processing Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 abstract description 5
- 230000001629 suppression Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 238000001914 filtration Methods 0.000 description 3
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
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Abstract
The utility model discloses a data acquisition module and a test system for DC-DC output ripple noise measurement, wherein the data acquisition module comprises a power supply, an adapter socket, a voltage bias circuit and a band-pass filter circuit, wherein the adapter socket, the voltage bias circuit and the band-pass filter circuit are respectively connected with the power supply; the output end of the voltage bias circuit is connected with the input end of the band-pass filter circuit; the input end of the voltage bias circuit is connected with the test end of the tested DC-DC device; the power end of the tested DC-DC device is connected with the adaptive socket; the output end of the band-pass filter circuit is the output end of the data acquisition module for DC-DC output ripple noise measurement. The utility model does not need to add an extra bias circuit or adjust the power supply rail of the operational amplifier, directly adjusts the input signal, has simple structure, is more convenient for adjusting the bias voltage, and has better suppression on power supply noise because the signal passes through the two-stage operational amplifier. The test data can be directly read through the LCD, and compared with the measuring method of the oscilloscope, the measuring method is simpler, more convenient and quicker.
Description
Technical Field
The utility model relates to the field of DC-DC output ripple noise measurement, in particular to a data acquisition module and a test system for DC-DC output ripple noise measurement.
Background
DC converters (commonly referred to as DC-DC) are widely used in a variety of electronic applications in many industries to convert DC power of one voltage class to DC power of another voltage class. The ripple noise is due to the internal high-speed switches, which is similar to a sine wave signal, and this noise is coupled to its output. When the output ripple noise is too large, the back-end circuit is greatly affected, and in the common DC-DC, the electrical parameters of the back-end circuit are introduced by the switching frequency, but the amplitude description of the switching frequency is less.
In the prior art, in order to obtain DC-DC output ripple noise, an oscilloscope is generally used for testing, and the testing method has high cost, low efficiency in batch testing and inconvenient carrying.
Generally, when the operational amplifier is used for processing ripple noise, the step of alternating current coupling is adopted, namely direct current bias is completely filtered, if direct current is completely filtered, the operational amplifier is powered by a double power supply, equipment or a negative-pressure chip capable of generating negative pressure is needed to be added to introduce a negative power supply, the noise is far greater than that of lithium battery power supply in terms of power supply, and a filter circuit is needed to be added subsequently. If a triode bias circuit is used, the low-voltage and low-power circuit cannot be met, the design difficulty and complexity are higher, and the triode has serious temperature drift. If the power supply rail of the operational amplifier is adjusted, the operational amplifier is more rigorous in type selection, and the common mode rejection ratio and the power supply voltage rejection ratio of the operational amplifier are changed due to the fact that the operational amplifier is changed, so that the cost is increased when the operational amplifier is selected.
Disclosure of Invention
Aiming at the defects in the prior art, the data acquisition module and the test system for DC-DC output ripple noise measurement solve the problem that the DC-DC output ripple noise signal is difficult to acquire.
In order to achieve the aim of the utility model, the utility model adopts the following technical scheme:
the data acquisition module for DC-DC output ripple noise measurement comprises a power supply, an adapter socket, a voltage bias circuit and a band-pass filter circuit, wherein the adapter socket, the voltage bias circuit and the band-pass filter circuit are respectively connected with the power supply;
the output end of the voltage bias circuit is connected with the input end of the band-pass filter circuit; the input end of the voltage bias circuit is connected with the test end of the tested DC-DC device; the power end of the tested DC-DC device is connected with the adaptive socket; the output end of the band-pass filter circuit is the output end of the data acquisition module for DC-DC output ripple noise measurement.
Further, the voltage bias circuit includes an operational amplifier U1 and an operational amplifier U2; the noninverting input end of the operational amplifier U1 is respectively connected with one end of the adjustable resistor R1 and the grounding resistor R2; the other end of the adjustable resistor R1 is an input end of a voltage bias circuit; the inverting input end of the operational amplifier U1 is connected with one end of a resistor R3; the output end of the operational amplifier U1 is respectively connected with one end of the resistor R4 and the other end of the resistor R3; the power end of the operational amplifier U1 is connected with a power supply;
the other end of the resistor R4 is respectively connected with the inverting input end of the operational amplifier U2 and one end of the resistor R5; the non-inverting input end of the operational amplifier U2 is connected with a reference voltage, and the output end of the operational amplifier U2 is connected with the other end of the resistor R5 and is used as the output end of the voltage bias circuit; the power end of the operational amplifier U2 is connected with a power supply.
Further, the band-pass filter circuit comprises an operational amplifier U3, and an inverting input end of the operational amplifier U3 is respectively connected with one end of a capacitor C1 and one end of a resistor R8; the other end of the capacitor C1 is respectively connected with one end of the resistor R6, one end of the capacitor C2 and the grounding resistor R7; the other end of the resistor R6 is an input end of the band-pass filter circuit; the non-inverting input end of the operational amplifier U3 is connected with a reference voltage; the output end of the operational amplifier U3 is respectively connected with the other end of the resistor R8 and the other end of the capacitor C2 and is used as the output end of the band-pass filter circuit.
The test system for DC-DC output ripple noise measurement based on the data acquisition module for DC-DC output ripple noise measurement comprises a data processing board card and a display; the input end of the data processing board card is connected with the output end of the band-pass filter circuit.
The beneficial effects of the utility model are as follows:
1. the data acquisition module does not need to add an extra bias circuit or adjust a power supply rail of the operational amplifier, is directly adjusted on an input signal, has a simple structure, is more convenient for adjusting bias voltage, and has better suppression on power supply noise because the signal passes through two-stage operational amplifiers.
2. The test system is powered by the battery, the integration level of the whole system is high, test data can be directly read through the LCD, and the test system is simpler, more convenient and quicker than the measuring method of the oscilloscope.
Drawings
FIG. 1 is a schematic diagram of the structure of the present data acquisition module;
FIG. 2 is a schematic diagram of a voltage bias circuit;
FIG. 3 is a schematic diagram of a bandpass filter circuit;
FIG. 4 is a schematic diagram of a test system.
Detailed Description
The following description of the embodiments of the present utility model is provided to facilitate understanding of the present utility model by those skilled in the art, but it should be understood that the present utility model is not limited to the scope of the embodiments, and all the utility models which make use of the inventive concept are protected by the spirit and scope of the present utility model as defined and defined in the appended claims to those skilled in the art.
As shown in fig. 1, the data acquisition module for DC-DC output ripple noise measurement includes a power supply, and an adapter socket, a voltage bias circuit and a band-pass filter circuit connected with the power supply, respectively;
the output end of the voltage bias circuit is connected with the input end of the band-pass filter circuit; the input end of the voltage bias circuit is connected with the test end of the tested DC-DC device; the power end of the tested DC-DC device is connected with the adaptive socket; the output end of the band-pass filter circuit is the output end of the data acquisition module for DC-DC output ripple noise measurement.
As shown in fig. 2, the voltage bias circuit includes an operational amplifier U1 and an operational amplifier U2; the noninverting input end of the operational amplifier U1 is respectively connected with one end of the adjustable resistor R1 and the grounding resistor R2; the other end of the adjustable resistor R1 is an input end of a voltage bias circuit; the inverting input end of the operational amplifier U1 is connected with one end of a resistor R3; the output end of the operational amplifier U1 is respectively connected with one end of the resistor R4 and the other end of the resistor R3; the power end of the operational amplifier U1 is connected with a power supply;
the other end of the resistor R4 is respectively connected with the inverting input end of the operational amplifier U2 and one end of the resistor R5; the non-inverting input end of the operational amplifier U2 is connected with a reference voltage, and the output end of the operational amplifier U2 is connected with the other end of the resistor R5 and is used as the output end of the voltage bias circuit; the power end of the operational amplifier U2 is connected with a power supply.
As shown in fig. 3, the band-pass filter circuit includes an operational amplifier U3, and an inverting input terminal of the operational amplifier U3 is connected to one end of a capacitor C1 and one end of a resistor R8, respectively; the other end of the capacitor C1 is respectively connected with one end of the resistor R6, one end of the capacitor C2 and the grounding resistor R7; the other end of the resistor R6 is an input end of the band-pass filter circuit; the non-inverting input end of the operational amplifier U3 is connected with a reference voltage; the output end of the operational amplifier U3 is respectively connected with the other end of the resistor R8 and the other end of the capacitor C2 and is used as the output end of the band-pass filter circuit.
In one embodiment of the utility model, the power supply adopts a 12V lithium battery, and a 4.7uF capacitor is added at the input end of a power supply line of the power supply for filtering, so that the noise of the power supply can be reduced.
In operation, the ratio of R1 to R2 is changed by adjusting the adjustable resistor R1 of the voltage bias circuit, so as to adjust the bias voltage of the input of the voltage bias circuit, where the expression is v1out= (vin×r2)/(r1+r2). Where v1out is the output voltage of the operational amplifier U1 and VIN is the output voltage of the DC-DC device under test.
As can be seen from the above formula, the VP-P voltage of VIN also varies with the adjustment of R1 and R2, so that the original signal is compensated by U2, and U2 is used as a single-power-supply inverting amplifier, and the output expression is v2out= ((r5+r4) ×vref-r5×v1out)/R4. The final output voltage of the voltage bias circuit can be obtained by combining the two expressions: vout= ((r5+r4) ×vref-r5 ((vin×r2)/(r1+r2)))/R4.
The band-pass filter circuit is used for filtering signals in certain frequency ranges, and the parameters of the band-pass filter circuit mainly comprise gain Kp; a center frequency w0; quality factor = Q; bandwidth Bw. When in use, the proper resistance and capacitance value can be adjusted according to the parameter of the switching frequency in the measured DC-DC device manual, clutter except the switching frequency is filtered, and the specific calculation formula is as follows:
Q＝w0/B
Q＝R8*w0*C/2；(C＝C1＝C2)
Kp＝Q/(R6*w0*C)
w0＝Q/((2Q2-Kp)*w0*C)
the capacitance and resistance values in the above formula are determined by a user, and the values of Q, w and Kp can be obtained by corresponding four primary equations with three unknowns.
In another embodiment, as shown in fig. 4, the test system for DC-DC output ripple noise measurement based on the data acquisition module for DC-DC output ripple noise measurement further comprises a data processing board card and a display; the input end of the data processing board card is connected with the output end of the band-pass filter circuit.
The output of the band-pass filter circuit is firstly collected by a data processing board card, then the collected voltage is converted into a digital signal through analog-to-digital conversion, then the digital signal is subjected to fast Fourier transform, the input signal is converted into a frequency domain from a time domain, the frequency point and the amplitude of the corresponding ripple noise are obtained by a spectrum estimation-based method, and finally the result is displayed through an LCD display. It should be noted that analog-to-digital conversion, fast fourier transformation of digital signals, methods based on spectrum estimation, and display of results by LCD displays are all prior art, which is not an innovation of the present utility model.
When the system is used for DC-DC ripple noise test, the flow is as follows:
step one: adjusting the peripheral circuit of the tested DC-DC device to enable the output of the tested DC-DC device to be within a specified value;
step two: installing a tested DC-DC device on an adaptive socket, turning on a power supply, adjusting the ratio of R1 to R2 in the graph 2 according to the output of the tested DC-DC device to bias the output direct current of U1 to 0.5 Vcc, compensating by U2, transmitting the signal into a lower band-pass filter, amplifying and filtering the signal by the band-pass filter, and screening out a desired frequency band and outputting the signal to a data processing board card;
step three: the data processing board card firstly collects data, the sampling rate is four times of f switching frequency, and 2N points are sampled (N is an integer, and the sampling point number is larger than the period). And then performing fast Fourier transform on the 2N points, calculating the amplitude of the corresponding frequency point, and finally displaying real-time data on an LCD screen.
Claims (4)
1. The data acquisition module for DC-DC output ripple noise measurement is characterized by comprising a power supply, an adaptive socket, a voltage bias circuit and a band-pass filter circuit, wherein the adaptive socket, the voltage bias circuit and the band-pass filter circuit are respectively connected with the power supply;
the output end of the voltage bias circuit is connected with the input end of the band-pass filter circuit; the input end of the voltage bias circuit is connected with the test end of the tested DC-DC device; the power end of the tested DC-DC device is connected with the adaptive socket; the output end of the band-pass filter circuit is the output end of the data acquisition module for DC-DC output ripple noise measurement.
2. The data acquisition module for DC-DC output ripple noise measurement of claim 1, wherein the voltage bias circuit comprises an operational amplifier U1 and an operational amplifier U2; the noninverting input end of the operational amplifier U1 is respectively connected with one end of the adjustable resistor R1 and the grounding resistor R2; the other end of the adjustable resistor R1 is an input end of a voltage bias circuit; the inverting input end of the operational amplifier U1 is connected with one end of a resistor R3; the output end of the operational amplifier U1 is respectively connected with one end of the resistor R4 and the other end of the resistor R3; the power end of the operational amplifier U1 is connected with a power supply;
the other end of the resistor R4 is respectively connected with the inverting input end of the operational amplifier U2 and one end of the resistor R5; the non-inverting input end of the operational amplifier U2 is connected with a reference voltage, and the output end of the operational amplifier U2 is connected with the other end of the resistor R5 and is used as the output end of the voltage bias circuit; the power end of the operational amplifier U2 is connected with a power supply.
3. The data acquisition module for DC-DC output ripple noise measurement according to claim 1, wherein the band-pass filter circuit comprises an operational amplifier U3, and an inverting input terminal of the operational amplifier U3 is connected to one end of the capacitor C1 and one end of the resistor R8, respectively; the other end of the capacitor C1 is respectively connected with one end of the resistor R6, one end of the capacitor C2 and the grounding resistor R7; the other end of the resistor R6 is an input end of the band-pass filter circuit; the non-inverting input end of the operational amplifier U3 is connected with a reference voltage; the output end of the operational amplifier U3 is respectively connected with the other end of the resistor R8 and the other end of the capacitor C2 and is used as the output end of the band-pass filter circuit.
4. A test system for DC-DC output ripple noise measurement based on the data acquisition module for DC-DC output ripple noise measurement of any one of claims 1 to 3, further comprising a data processing board and a display; the input end of the data processing board card is connected with the output end of the band-pass filter circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321821666.4U CN220438460U (en) | 2023-07-12 | 2023-07-12 | Data acquisition module and test system for DC-DC output ripple noise measurement |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321821666.4U CN220438460U (en) | 2023-07-12 | 2023-07-12 | Data acquisition module and test system for DC-DC output ripple noise measurement |
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| Publication Number | Publication Date |
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| CN220438460U true CN220438460U (en) | 2024-02-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202321821666.4U Active CN220438460U (en) | 2023-07-12 | 2023-07-12 | Data acquisition module and test system for DC-DC output ripple noise measurement |
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| CN (1) | CN220438460U (en) |
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- 2023-07-12 CN CN202321821666.4U patent/CN220438460U/en active Active
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