CN106405236A - Weak ripple and harmonic voltage detection device and method for direct-current voltage-stabilized power supply - Google Patents
Weak ripple and harmonic voltage detection device and method for direct-current voltage-stabilized power supply Download PDFInfo
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- CN106405236A CN106405236A CN201610957455.1A CN201610957455A CN106405236A CN 106405236 A CN106405236 A CN 106405236A CN 201610957455 A CN201610957455 A CN 201610957455A CN 106405236 A CN106405236 A CN 106405236A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/16—Spectrum analysis; Fourier analysis
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Abstract
The invention relates to a weak ripple and harmonic voltage detection device and method for a direct-current voltage-stabilized power supply. The device comprises a ripple signal extracting circuit, a reference signal circuit and a measuring circuit. The ripple signal extracting circuit and the reference signal circuit are connected with the measuring signal. According to the detection device and method, measurement is carried out by using a lock-in amplifier circuit; and a reference signal is taken from a transformer or a switching power supply oscillator. The detection sensitivity and anti-interference ability are high. Microvolt-level or sub-microvolt-level ripple and higher harmonic voltage can be measured. The operation is convenient.
Description
Technical field
The present invention relates to D.C. regulated power supply detection technique field, the faint ripple of more particularly, to a kind of D.C. regulated power supply and
Harmonic voltage detection means and method.
Background technology
Power supply ripple and noise voltage are the important parameters weighing D.C. regulated power supply quality, and ripple and noise can affect electricity
The performance of subsystem, causes electronic system malfunction, or even threat to life property safety.
The ripple of power supply and harmonic wave, mainly have following several measuring method at present：First, surveyed using A.C. voltmeter
Amount, there are environmental disturbances greatly in the method, different A.C. voltmeter frequency band ranges are different, also affects measurement result.Sensitivity can only
Reach about hundred microvolts it is impossible to measure each order harmonicses of ripple；Second, measured using oscillograph, the method test system
Easily affected by ground loop, inside and outside noise mixes, and is not measured less than the ripple voltage of oscillograph resolution ratio,
The ripple of millivolt level typically can only be measured；3rd, using differential type amplifier, each order harmonicses of ripple equally cannot be measured.
The ripple measuring method applied at present can only measure mV magnitude mostly, and minority can be measured that the side of μ V magnitude
Method process is very loaded down with trivial details, and there are a lot of problems.With development in science and technology, system power supply is more and more lower, and the impact of ripple is increasingly
Greatly, ripple detection method in the past is difficult to meet existing needs, for this reason, it may be necessary to develop a kind of more effective D.C. regulated power supply
Ripple determiner, to adapt to new requirement.
Content of the invention
The technical problem to be solved is for above-mentioned the deficiencies in the prior art, provides a kind of D.C. regulated power supply
Faint ripple and harmonic voltage detection means and method.
The technical scheme that the present invention solves above-mentioned technical problem is as follows：A kind of faint ripple of D.C. regulated power supply and harmonic wave electricity
Pressure detection means, includes ripple signal and extracts circuit, reference signal circuit and measuring circuit, described ripple signal extract circuit with
Reference signal circuit is connected with described measuring circuit respectively.
Described ripple signal extracts circuit and is used for extracting the alternating signal of the output of D.C. regulated power supply, and as quilt
Survey signal；Described reference signal circuit is used for providing the reference signal of CF for described measuring circuit；And by described survey
It is described reference letter with described reference signal frequency identical ripple signal and frequency in measured signal described in amount electric circuit inspection
The harmonic signal of number frequency integral multiple.
The invention has the beneficial effects as follows：A kind of faint ripple of D.C. regulated power supply of the present invention and harmonic voltage detection dress
Put, reference signal takes from transformer or Switching Power Supply oscillator detection sensitivity and strong antijamming capability, can measure microvolt or
Sub-micro lies prostrate ripple and the higher harmonic voltage of rank, very convenient.
On the basis of technique scheme, the present invention can also do following improvement：
Further：Described ripple signal extracts circuit and adopts block isolating circuit, and its high-pass equipment is less than 50Hz.
The beneficial effect of above-mentioned further scheme is：Take out the electricity of D.C. regulated power supply output by described block isolating circuit
Pressure, and the signal of D.C. regulated power supply output is filtered, filter flip-flop therein, finally export measured signal, carry
The quality of high output signal, is easy to subsequently improve the accuracy of testing result.
Further：Described D.C. regulated power supply is linear power supply.
Further：Described reference signal circuit includes transformer T1, voltage stabilizing power supplying circuit and the first reference signal conditioning electricity
Road, the two ends of primary coil of described transformer T1 are electrically connected with outside city, and the two ends of primary coil are also steady with direct current to be measured
The Alternating Current Power Supply input of voltage source is corresponding to be connected, and the output end of D.C. regulated power supply to be measured is passed through described ripple signal and extracted electricity
Road is connected with the input of described measuring circuit, the two ends of secondary coil of described transformer T1 and described voltage stabilizing power supplying circuit
Two inputs connect, and the two ends of secondary coil are also corresponding with two signal input parts of described first reference signal modulate circuit
Connect, described voltage stabilizing power supplying circuit is connected with described first reference signal modulate circuit and provides power supply, described first ginseng for it
The output end examining signal conditioning circuit is connected with the reference input of described measuring circuit.
The beneficial effect of above-mentioned further scheme is：Ripple due to direct current linear power supply is produced by power frequency component and its harmonic wave
Raw, so when DC voltage power supply is for linear power supply, using the power frequency component directly obtaining from civil power, through a series of changes
Obtain after changing process with power frequency completely with the available signal of frequency and described measuring circuit as reference signal, so subsequently survey
Amount circuit can accurately measure the power frequency component in ripple, and accurately isolates remaining ripple signal.
Further：Described D.C. regulated power supply is linear power supply or Switching Power Supply.
Further：Described reference signal circuit also includes the second reference signal modulate circuit, in D.C. regulated power supply to be measured
The output end of high-frequency generator is connected with the input of described second reference signal modulate circuit, described first reference signal conditioning
The output end of circuit and the second reference signal modulate circuit is passed through selecting switch K and is connected with the reference input of described measuring circuit
Connect, described voltage stabilizing power supplying circuit is connected with described second reference signal modulate circuit and provides power supply for it.
The beneficial effect of above-mentioned further scheme is：Ripple due to direct-current switch power supply is produced by its internal switch device,
So the frequency of internal switching circuits to be obtained, reconvert becomes the available reference signal of measuring circuit, could be from ripple signal
In detect the ripple of Switching Power Supply.By taking out and through described second with reference to letter from the high-frequency generator of described Switching Power Supply
Number adjustment circuit adjustment and processing, and by described switch K switching it is possible to from the signal that D.C. regulated power supply to be measured exports
Detect the ripple of Switching Power Supply or the ripple detecting power frequency component from the signal of D.C. regulated power supply to be measured output.
Present invention also offers a kind of, D.C. regulated power supply faint ripple voltage detection method, comprise the steps：
Step 1：The output signal of D.C. regulated power supply to be measured is carried out processing every straight, and using the signal after processing as quilt
Survey signal；
Step 2：The reference signal that reference signal circuit is exported exports to measuring circuit, and is examined by described measuring circuit
Survey whole for described reference signal frequency with described reference signal frequency identical ripple signal and frequency in described measured signal
The harmonic signal of several times.
Brief description
Fig. 1 is a kind of faint ripple of D.C. regulated power supply and the harmonic voltage structure of the detecting device schematic diagram of the present invention；
Fig. 2 is the circuit diagram of the ripple signal extraction circuit of the present invention；
Fig. 3 is the circuit diagram of the measuring circuit of the present invention；
Fig. 4 is the circuit diagram of the reference signal circuit of the embodiment of the present invention one；
Fig. 5 is the circuit diagram of the first reference signal modulate circuit of the present invention；
Fig. 6 is the circuit diagram of the reference signal circuit of the embodiment of the present invention two；
Fig. 7 is a kind of faint ripple of D.C. regulated power supply and the harmonic voltage detection method schematic flow sheet of the present invention.
Specific embodiment
Below in conjunction with accompanying drawing, the principle of the present invention and feature are described, example is served only for explaining the present invention, and
Non- for limiting the scope of the present invention.
As shown in figure 1, a kind of faint ripple of D.C. regulated power supply and harmonic voltage detection means, extract including ripple signal
Circuit, reference signal circuit and measuring circuit, described ripple signal extract circuit and reference signal circuit respectively with described measurement
Circuit connects.
Wherein, described ripple signal extracts circuit and is used for extracting the alternating signal of the output of D.C. regulated power supply, and by its
As measured signal；Described reference signal circuit is used for providing the reference signal of CF for described measuring circuit；Described survey
It is described ginseng that amount circuit is used for detecting in described measured signal with described reference signal frequency identical ripple signal and frequency
Examine the harmonic signal of signal frequency integral multiple.
In the present embodiment, described ripple signal extracts circuit and adopts block isolating circuit, and its high-pass equipment is less than 50Hz.
As shown in Fig. 2 in the present embodiment, described block isolating circuit includes resistance R1, resistance R2 and electric capacity C1, described resistance R1
Two ends connect one to one with the two ends of D.C. regulated power supply respectively, described resistance R2 and electric capacity C1 series connection after be connected in parallel on institute again
State the two ends of resistance R1, and the two ends of described resistance R2 are connected with described measuring circuit as the output end of measured signal.Pass through
Described resistance R1 removes the voltage of D.C. regulated power supply output, and can be to D.C. regulated power supply output by described electric capacity C1
Signal is filtered, and filters flip-flop therein, exports measured signal finally by described resistance R2, improves output signal
Quality, is easy to subsequently improve the accuracy of testing result.
As shown in figure 3, in the present embodiment, using lock phase amplifying circuit, it includes preamplifier, phase to described measuring circuit
Quick wave detector, low pass filter, dc amplifier and phase-shifter, described ripple signal extracts circuit with described preamplifier even
Connect, described preamplifier, phase-sensitive detector, low pass filter and dc amplifier are sequentially connected with, described reference signal circuit
It is connected with described phase-shifter.By the above-mentioned described lock phase amplifying circuit from structure, on the one hand can be with reduces cost, another aspect institute
State lock phase amplifying circuit and there is splendid sensitivity and antijamming capability.
As shown in Figure 4 it is preferable that described reference signal circuit includes transformer T1, voltage stabilizing power supplying circuit and the first reference
Signal conditioning circuit, the two ends of primary coil of described transformer T1 are electrically connected with outside city, and the two ends of primary coil also with
Two inputs of D.C. regulated power supply to be measured are corresponding to be connected, and the output end of D.C. regulated power supply to be measured passes through described ripple signal
Extract circuit to be connected with the input of described measuring circuit, the two ends of secondary coil of described transformer T1 and described voltage stabilizing are powered
The Alternating Current Power Supply input of circuit connects, the two ends of secondary coil two signals also with described first reference signal modulate circuit
Input is corresponding to be connected, and described voltage stabilizing power supplying circuit is connected with described first reference signal modulate circuit and provides power supply for it,
The output end of described first reference signal modulate circuit is connected with the reference input of described measuring circuit.
Preferably, described D.C. regulated power supply is linear power supply, for for the first reference signal modulate circuit and/or second
Reference signal modulate circuit is powered.The operation principle of linear power supply is first by transformer, 220V civil power to be switched to low-voltage alternating-current
Electricity, such as exchanges 12V, obtains 5V direct current after bridge rectifier, capacitor filtering and 7805 voltage stabilizings.
Ripple due to linear stabilized power supply to be measured is produced by power frequency, so when D.C. regulated power supply to be measured is linear power supply
When, using the power frequency component directly obtaining from the civil power of same supply line, obtain and work after a series of conversion process
The available signal of frequency Complete Synchronization and described measuring circuit as reference signal, can accurately survey by so follow-up measuring circuit
Measure power frequency synchronization ripple and its harmonic wave of voltage-stabilized power supply to be measured.
As shown in figure 5, in the present embodiment, described first reference signal modulate circuit include potentiometer RP, current-limiting resistance R3,
Light electric coupling pipe U3, resistance R4, Schmidt trigger U4, resistance R5 and electric capacity C6, described potentiometer RP and current-limiting resistance R3 is suitable
Secondary be connected between one end of described transformer T1 secondary coil and No. 2 pins of described smooth electric coupling pipe U3, described transformer
The other end of T1 secondary coil is directly connected with No. 3 pins of described smooth electric coupling pipe U3, and No. 5 of described smooth electric coupling pipe U3 are drawn
Pin is grounded, and No. 6 pins are connected with No. 1 pin of described Schmidt trigger U4, No. 8 pins and described 5V voltage stabilizing power supplying circuit
Output end connects, and is connected with described resistance R4 between No. 6 pins and No. 8 pins；No. 2 pins of described Schmidt trigger U4
It is connected with No. 3 pins, No. 4 pins pass through described resistance R5 ground connection, and No. 4 pins are also by described electric capacity C6 and measuring circuit
Input connects, No. 7 pin ground connection, and No. 14 pins are connected with the output end of described 5V voltage stabilizing power supplying circuit.By described first
The power frequency reference signal taking from transformer T1 can be nursed one's health the square-wave signal of the standard that is shaped to by reference signal modulate circuit, as
The reference signal of lock phase amplifying circuit.
Wherein, described smooth electric coupling pipe adopts the high speed optoelectronic coupling pipe of model 6N136, described Schmidt trigger
Model CD40106.
As shown in Figure 6 it is preferable that described reference signal circuit also includes the second reference signal modulate circuit, direct current to be measured
The output end of voltage-stabilized power supply medium-high frequency oscillator is connected with the input of described second reference signal modulate circuit, described first ginseng
The output end examining signal conditioning circuit and the second reference signal modulate circuit passes through the reference of selecting switch K and described measuring circuit
Input connects, and described voltage stabilizing power supplying circuit is connected with described second reference signal modulate circuit and provides power supply for it.
Preferably, described D.C. regulated power supply to be measured is linear power supply or Switching Power Supply.
Ripple due to Switching Power Supply is produced by its internal switch, so the frequency of internal switching circuits to be obtained, then turn
Change into as the available reference signal of measuring circuit, the ripple of Switching Power Supply could be detected from ripple signal.By from described
The high-frequency generator of Switching Power Supply takes out and through described second reference signal modulate circuit adjustment and processes, and is opened by described
Close K switching it is possible to detect the ripple of Switching Power Supply from the signal of D.C. regulated power supply to be measured output or to be measured straight
The ripple of power frequency component is detected in the signal of stream voltage-stabilized power supply output.
When using Switching Power Supply, its with linear power supply operation principle similar, difference is reference signal from switch
The oscillator of power supply takes out, and is easy to detect the ripple of Switching Power Supply from ripple signal.
As shown in fig. 7, present invention also offers a kind of faint ripple of D.C. regulated power supply and harmonic voltage detection method, bag
Include following steps：
Step 1：The output signal of D.C. regulated power supply to be measured is carried out processing every straight, and using the signal after processing as quilt
Survey signal；
Step 2：The reference signal that reference signal circuit is exported exports to measuring circuit, and is examined by described measuring circuit
Survey whole for described reference signal frequency with described reference signal frequency identical ripple signal and frequency in described measured signal
The harmonic signal of several times.
A kind of faint ripple of D.C. regulated power supply of the present invention and harmonic voltage detection means and method, are mutually amplified using lock
Device measures, and reference signal takes from transformer or Switching Power Supply oscillator detection sensitivity and strong antijamming capability, can survey
The ripple of amount microvolt or sub-micro volt rank and higher harmonic voltage, very convenient.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all spirit in the present invention and
Within principle, any modification, equivalent substitution and improvement made etc., should be included within the scope of the present invention.
Claims (8)
1. a kind of faint ripple of D.C. regulated power supply and harmonic voltage detection means it is characterised in that:Extract including ripple signal
Circuit, reference signal circuit and measuring circuit, described ripple signal extract circuit and reference signal circuit respectively with described measurement
Circuit connects；
Described ripple signal extracts circuit and is used for extracting the alternating signal of the output of D.C. regulated power supply to be measured, and as quilt
Survey signal；
Described reference signal circuit is used for providing the reference signal of CF for described measuring circuit；
Described measuring circuit be used for detecting in described measured signal with described reference signal frequency identical ripple signal and frequency
Rate is the harmonic signal of described reference signal frequency integral multiple.
2. according to claim 1 a kind of faint ripple of D.C. regulated power supply and harmonic voltage detection means it is characterised in that:
Described ripple signal extracts circuit and adopts block isolating circuit, and its high-pass equipment is less than 50Hz.
3. according to claim 1 a kind of faint ripple of D.C. regulated power supply and harmonic voltage detection means it is characterised in that:
Described measuring circuit is using lock phase amplifying circuit.
4. according to claim 1 a kind of faint ripple of D.C. regulated power supply and harmonic voltage detection means it is characterised in that:
Described reference signal circuit includes transformer T1, voltage stabilizing power supplying circuit and the first reference signal modulate circuit, described transformer T1
The two ends of primary coil electrically connect with outside city, and the Alternating Current Power Supply also with D.C. regulated power supply to be measured for the two ends of primary coil
Input is corresponding to be connected, and the output end of D.C. regulated power supply to be measured extracts circuit and described measuring circuit by described ripple signal
Input connect, the two ends of secondary coil of described transformer T1 are connected with two inputs of described voltage stabilizing power supplying circuit,
The two ends of secondary coil are also corresponding with two signal input parts of described first reference signal modulate circuit to be connected, and described voltage stabilizing supplies
Circuit is connected with described first reference signal modulate circuit and provides power supply for it, described first reference signal modulate circuit
Output end is connected with the reference input of described measuring circuit.
5. according to claim 4 a kind of faint ripple of D.C. regulated power supply and harmonic voltage detection means it is characterised in that:
Described D.C. regulated power supply to be measured is linear stabilized power supply.
6. according to claim 4 a kind of faint ripple of D.C. regulated power supply and harmonic voltage detection means it is characterised in that:
Described reference signal circuit also includes the second reference signal modulate circuit, the output of D.C. regulated power supply medium-high frequency oscillator to be measured
End is connected with the input of described second reference signal modulate circuit, and described first reference signal modulate circuit and second is with reference to letter
The output end of number modulate circuit is connected with the reference input of described measuring circuit by selecting switch K, and described voltage stabilizing is powered electricity
Road is connected with described second reference signal modulate circuit and provides power supply for it.
7. according to claim 6 a kind of faint ripple of D.C. regulated power supply and harmonic voltage detection means it is characterised in that:
Described D.C. regulated power supply to be measured is linear power supply or Switching Power Supply.
8. a kind of faint ripple of D.C. regulated power supply and harmonic voltage detection method are it is characterised in that comprise the steps：
Step 1：The output signal of D.C. regulated power supply to be measured is carried out processing every straight, and using the signal after processing as tested letter
Number；
Step 2：The reference signal that reference signal circuit is exported exports to measuring circuit, and detects institute by described measuring circuit
Stating in measured signal with described reference signal frequency identical ripple signal and frequency is described reference signal frequency integral multiple
Harmonic signal.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610957455.1A CN106405236A (en) | 2016-10-27 | 2016-10-27 | Weak ripple and harmonic voltage detection device and method for direct-current voltage-stabilized power supply |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610957455.1A CN106405236A (en) | 2016-10-27 | 2016-10-27 | Weak ripple and harmonic voltage detection device and method for direct-current voltage-stabilized power supply |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107543976A (en) * | 2017-08-24 | 2018-01-05 | 中国电子科技集团公司第四十研究所 | A kind of devices and methods therefor for being used to detect electromagnetic radiation small-signal |
| CN112485697A (en) * | 2020-11-11 | 2021-03-12 | 中山大学 | High-voltage power supply ripple measurement and analysis system based on phase-locked amplification algorithm |
| WO2022267437A1 (en) * | 2021-06-21 | 2022-12-29 | 合肥美的暖通设备有限公司 | Harmonic measurement method and apparatus, variable-frequency drive and storage medium |
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