CN105548724A - Test system and method of inductance value of smoothing reactor - Google Patents
Test system and method of inductance value of smoothing reactor Download PDFInfo
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- CN105548724A CN105548724A CN201510915615.1A CN201510915615A CN105548724A CN 105548724 A CN105548724 A CN 105548724A CN 201510915615 A CN201510915615 A CN 201510915615A CN 105548724 A CN105548724 A CN 105548724A
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- switch
- inductance
- smoothing reactor
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- rcl
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
Abstract
The invention provides a test system and method of the inductance value of a smoothing reactor. The test system of the inductance value of the smoothing reactor includes a voltage regulator for regulating voltage, an isolation step-down transformer, a rectifier bridge for converting alternating current into direct current, a first filtering inductor, a second filtering inductor, a first current limiting inductor, a second current limiting inductor, a connecting port for connecting a tested smoothing reactor, a first switch, a second switch, a third switch, a first blocking capacitor, a second blocking capacitor and an RCL bridge tester. According to the test system and method of the invention, the characteristics that inductors can conduct direct current and block alternating current and capacitors can conduct alternating current and block direct current are ingeniously utilized, so that direct current can be successfully applied to the tested smoothing reactor and will not flow into the RCL bridge tester, and high-frequency carriers can be applied to the tested smoothing reactor and will not flow into a power grid end, and therefore, the inductance value of the smoothing reactor can be measured. The test system and method have high measurement precision.
Description
Technical field
The present invention relates to field of electronic devices, particularly relate to a kind of test macro and method of smoothing reactor sensibility reciprocal.
Background technology
Smoothing reactor is used in the later DC loop of rectification.The pulse number of rectification circuit is always limited, always has ripple in the DC voltage exported.This ripple is harmful to often, needs to be suppressed by smoothing reactor.The current conversion station of direct current transportation all needs smoothing reactor is housed, and makes the direct current of output close to ideal DC; Rush in electric stake at new-energy automobile, smoothing reactor is also absolutely necessary, the high frequency ripple after its high-frequency PWM controlled rectification of filtering.Therefore, smoothing reactor is one of vitals of power electronics industry.
The inductance value of smoothing reactor is the electric parameter of its core, existing method of testing great majority are all survey its direct current sensibility reciprocal by the method for testing of AC reactor, namely, by tested reactor string in ac circuit, its equal alternating current logical, measure the pressure drop U at tested reactor two ends, then calculate its sensibility reciprocal value by formula L=U/ (ω I).The producer also had directly measures inductance value when it for direct current sensibility reciprocal uses with RCL electric bridge is cold.If have further investigation to know to direct current reactor, the DC magnetization curve of core of reactor is completely not identical with ac magnetization curve, so the DC inductance that above-mentioned first method is tested is inaccurate, and differs greatly sometimes.Above-mentioned second method, uses RCL directly to measure, has just measured its unloaded inductance value, the inductance value not when rated current, and user's often required inductance value when being rated current.
Therefore, prior art has yet to be improved and developed
Summary of the invention
Fundamental purpose of the present invention is the defect for prior art, provides a kind of test macro and method of smoothing reactor sensibility reciprocal.
The technological means that technical solution problem of the present invention adopts is: the test macro providing a kind of smoothing reactor sensibility reciprocal, comprise for the pressure regulator of voltage-regulation, insulate step-down transformer, for alternating current being become galvanic rectifier bridge, the first filter inductance, the second filter inductance, the first current-limiting inductance, the second current-limiting inductance, the connectivity port being used for connecting tested smoothing reactor, the first switch, second switch, the 3rd switch, the first capacitance, the second capacitance and RCL bridge test instrument;
The input end of described pressure regulator is connected with electrical network, the output terminal of described pressure regulator is connected with the input end of described insulate step-down transformer, the output terminal of described insulate step-down transformer is connected with the input end of described rectifier bridge, the positive output end of described rectifier bridge, described first filter inductance, first current-limiting inductance, described first switch, one end of described first isolation capacitance and described RCL bridge test instrument connects successively, the negative output terminal of described rectifier bridge, described second filter inductance, described second current-limiting inductance, described second switch, the other end of described second isolation capacitance and described RCL bridge test instrument connects successively, the two ends of described connectivity port are connected with described first switch and the common node of described first isolation capacitance and the common node of described second switch and described second isolation capacitance respectively, and the two ends of described 3rd switch are connected with described first switch and the common node of described first isolation capacitance and the common node of described second switch and described second isolation capacitance respectively.
In the test macro of smoothing reactor sensibility reciprocal provided by the invention, also comprise filter capacitor, the two ends of described filter capacitor are connected with described first filter inductance and the common node of described first current-limiting inductance and the common node of described second filter inductance and described second current-limiting inductance respectively.
In the test macro of smoothing reactor sensibility reciprocal provided by the invention, described pressure regulator is carbon brush type pressure regulator.
In the test macro of smoothing reactor sensibility reciprocal provided by the invention, described pressure regulator is induction voltage regulator.
In the test macro of smoothing reactor sensibility reciprocal provided by the invention, the capacitance of described first capacitance and described second capacitance is more than or equal to 4700 μ F.
In the test macro of smoothing reactor sensibility reciprocal provided by the invention, the inductance value of described first current-limiting inductance and described second current-limiting inductance is all more than or equal to the inductance value 100 times of described tested smoothing reactor.
Present invention also offers a kind of method of testing of the test macro based on the smoothing reactor sensibility reciprocal described in above-mentioned any one, comprise the following steps:
S1, open RCL bridge test instrument, disconnect the first switch and second switch and closed 3rd switch, described RCL bridge test instrument is reset.
S2, keep described first switch, described second switch to disconnect, and described 3rd switch is disconnected, obtain the first unloaded inductance value L of the tested smoothing reactor that described RCL bridge test instrument records
o1;
S3, closed described first switch, described second switch, described 3rd switch remains open, and described pressure regulator and electrical network is disconnected, and then obtains the second unloaded inductance value L that described RCL bridge test instrument records
o2;
S4, according to described first unloaded inductance value L
o1and described first unloaded inductance value L
o2calculate inductance rate of change Y, wherein Y=(L
o2-L
o1)/L
o1;
The voltage of input end of S5, adjustment pressure regulator make described tested smoothing reactor on the electric current that flows through be the rated current of this tested smoothing reactor, obtain the load inductance value L that now described RCL electric bridge records
1;
S6, revise described load inductance value L according to described inductance rate of change Y
1to obtain final actual inductance value L, wherein L=L
1* (1-Y).
Implement test macro and the method for a kind of smoothing reactor sensibility reciprocal provided by the invention, have following beneficial effect:
The present invention is ingenious to be utilized inductance to lead to directly smoothly direct current to be added to tested smoothing reactor every straight characteristic every giving electric capacity to lead to hand over and do not flow into RCL bridge test instrument, high frequency carrier is added to tested smoothing reactor and does not flow into electrical network end, thus record the inductance value of smoothing reactor, there is the beneficial effect that measuring accuracy is high.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of the test macro of smoothing reactor sensibility reciprocal in one embodiment of the present invention.
The realization of the object of the invention, functional characteristics and advantage will in conjunction with the embodiments, are described further with reference to accompanying drawing.
Embodiment
By reference to the accompanying drawings embodiments of the invention are described above; but the present invention is not limited to above-mentioned embodiment; above-mentioned embodiment is only schematic; instead of it is restrictive; those of ordinary skill in the art is under enlightenment of the present invention; do not departing under the ambit that present inventive concept and claim protect, also can make a lot of form, these all belong within protection of the present invention.
Unless otherwise defined, all technology used herein and scientific terminology are identical with belonging to the implication that those skilled in the art of the present invention understand usually.The object of term used in the description of the invention herein just in order to describe specific embodiment, is not intended to be restriction the present invention.Term as used herein " and/or " comprise arbitrary and all combinations of one or more relevant Listed Items.
Fig. 1 shows the test macro of 1 in one embodiment of the present invention, a kind of smoothing reactor sensibility reciprocal, it is characterized in that, comprise for the pressure regulator 100 of voltage-regulation, insulate step-down transformer 200, for alternating current being become galvanic rectifier bridge 300, first filter inductance L1, the second filter inductance L2, the first current-limiting inductance L3, the second current-limiting inductance L4, the connectivity port being used for connecting tested smoothing reactor L5, the first K switch 1, second switch K2, the 3rd K switch 3, first capacitance C2, the second capacitance C3 and RCL bridge test instrument 900.
The input end of described pressure regulator 100 is connected with electrical network, the output terminal of described pressure regulator 100 is connected with the input end of described insulate step-down transformer 200, the output terminal of described insulate step-down transformer 200 is connected with the input end of described rectifier bridge 300, the positive output end of described rectifier bridge 300, described first filter inductance L1, first current-limiting inductance L3, described first K switch 1, one end of described first isolation capacitance C2 and described RCL bridge test instrument 900 connects successively, the negative output terminal of described rectifier bridge 300, described second filter inductance L2, described second current-limiting inductance L4, described second switch K2, the other end of described second isolation capacitance C3 and described RCL bridge test instrument 900 connects successively, the two ends of described connectivity port are connected with described first K switch 1 and the common node of described first isolation capacitance C2 and the common node of described second switch K2 and described second isolation capacitance C3 respectively, and the two ends of described 3rd K switch 3 are connected with described first K switch 1 and the common node of described first isolation capacitance C2 and the common node of described second switch K2 and described second isolation capacitance C3 respectively.
Preferably, the test macro of smoothing reactor sensibility reciprocal also comprises filter capacitor C1, and the two ends of described filter capacitor C1 are connected with the common node of described first filter inductance L1 and described first current-limiting inductance L3 and the common node of described second filter inductance L2 and described second current-limiting inductance L4 respectively.
Particularly, this pressure regulator 100 can be single-phase or three-phase, can be carbon brush type pressure regulator and also can be induction voltage regulator.Pressure regulator 100 input end gets access to grid, and this insulate step-down transformer 200 becomes low-voltage and high-current for the voltage exported by pressure regulator 100 and exports rectifier bridge 300 to.Rectifier bridge 300 can be controlled rectification or uncontrollable rectification, and it such as, for being transformed to the direct current of low-voltage and high-current, DC10V/5000A etc. by alternating voltage.The direct current that this rectifier bridge 300 exports obtains the DC source of relative smooth by the first filter inductance L1 and the second filter inductance L2 filtering ripple.In order to record tested smoothing reactor L5 inductance value, the carrier wave of the exportable different frequency of RCL bridge test instrument 900 and different voltage magnitude is to tested smoothing reactor L5, RCL bridge test instrument 900, by detecting and calculate the carrier signal added on tested smoothing reactor L5, can obtain the direct current sensibility reciprocal of tested smoothing reactor L5.
The present invention utilizes inductance to lead to and directly direct current is added to tested smoothing reactor L5 smoothly every straight characteristic every giving electric capacity to lead to hand over and do not flow into RCL bridge test instrument 900, high frequency carrier is added to tested smoothing reactor L5 and does not flow electrical network end, being further analyzed below.
When DC current adds tested smoothing reactor L5, due to the existence of the first capacitance C2 and the second capacitance C3, direct current cannot flow into RCL bridge test instrument 900, protects RCL bridge test instrument 900; In like manner, when the carrier wave that RCL bridge test instrument 900 exports different frequency and different voltage magnitude is upper to tested smoothing reactor L5, is also applied to net simultaneously and has held, but, due to the existence of the first current-limiting inductance L3 and the second current-limiting inductance L4, high frequency carrier is prevented to add to electrical network end to greatest extent.
High-frequency carrier signal detected on RCL bridge test instrument 900 is all the pressure drop U on tested smoothing reactor L5 substantially
~, RCL electric bridge 900 obtains high frequency pressure drop U by detection
~, high-frequency current I
~, frequency f
~, according to L=U
~/ (ω I
~) the load inductance L of tested smoothing reactor L5 can be calculated.All test signals detect and calculate and all complete voluntarily in RCL bridge test instrument 900 inside.
Preferably, in order to make the high frequency carrier of RCL bridge test instrument 900 add on tested smoothing reactor L5 more smoothly, the first capacitance C2 and the second capacitance C3 chooses the bulky capacitor being more than or equal to 4700 μ F usually.Do not flow into electrical network end to stop high frequency carrier to add to tested smoothing reactor L5, the inductance value usually getting the first current-limiting inductance L3 and the second current-limiting inductance L4 is more than or equal to the inductance value 100 times of tested smoothing reactor L5.In order to more be beneficial to test, the high frequency carrier that RCL bridge test instrument 900 exports usually is chosen and is more than or equal to 1KHz.
Further, in order to reduce or eliminate the impact of connection line as far as possible, after RCL bridge test instrument 900 resets, tested smoothing reactor L5 does not first connect current supply circuit, and namely the first K switch 1, second switch K2 and the 3rd open K3 and all disconnect.
Present invention also offers a kind of method of testing of the test macro based on the smoothing reactor sensibility reciprocal described in above-mentioned any one, comprise the following steps:
S1, open RCL bridge test instrument, disconnect the first switch and second switch and closed 3rd switch, described RCL bridge test instrument is reset;
S2, keep described first switch, described second switch to disconnect, and described 3rd switch is disconnected, obtain the first unloaded inductance value L of the tested smoothing reactor that described RCL bridge test instrument records
o1;
S3, closed described first switch, described second switch, described 3rd switch remains open, and described pressure regulator and electrical network is disconnected, and then obtains the second unloaded inductance value L that described RCL bridge test instrument records
o2;
S4, according to described first unloaded inductance value L
o1and described first unloaded inductance value L
o2calculate inductance rate of change Y, wherein Y=(L
o2-L
o1)/L
o1;
The voltage of input end of S5, adjustment pressure regulator make described tested smoothing reactor on the electric current that flows through be the rated current of this tested smoothing reactor, obtain the load inductance value L that now described RCL electric bridge records
1;
S6, revise described load inductance value L according to described inductance rate of change Y
1to obtain final actual inductance value L, wherein L=L
1* (1-Y).
Preferably, in order to make the high frequency carrier of RCL bridge test instrument 900 add on tested smoothing reactor L5 more smoothly, the first capacitance C2 and the second capacitance C3 chooses the bulky capacitor being more than or equal to 4700 μ F usually.Do not flow into electrical network end to stop high frequency carrier to add to tested smoothing reactor L5, the inductance value usually getting the first current-limiting inductance L3 and the second current-limiting inductance L4 is more than or equal to the inductance value 100 times of tested smoothing reactor L5.In order to more be beneficial to test, the high frequency carrier that RCL bridge test instrument 900 exports usually is chosen and is more than or equal to 1KHz.
Further, in order to reduce or eliminate the impact of connection line as far as possible, after RCL bridge test instrument 900 resets, tested smoothing reactor L5 does not first connect current supply circuit, and namely the first K switch 1, second switch K2 and the 3rd K switch 3 all disconnect.
Should be noted that; the technical scheme of each embodiment of the present invention can be combined with each other; but must be can be embodied as basis with those skilled in the art; when technical scheme combination occur conflicting maybe cannot realize time people should think that the combination of this technical scheme does not exist, also not within the protection domain of application claims.
These are only the preferred embodiments of the present invention; not thereby the scope of the claims of the present invention is limited; every utilize instructions of the present invention and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (8)
1. the test macro of a smoothing reactor sensibility reciprocal, it is characterized in that, comprise for the pressure regulator of voltage-regulation, insulate step-down transformer, for alternating current being become galvanic rectifier bridge, the first filter inductance, the second filter inductance, the first current-limiting inductance, the second current-limiting inductance, the connectivity port being used for connecting tested smoothing reactor, the first switch, second switch, the 3rd switch, the first capacitance, the second capacitance and RCL bridge test instrument;
The input end of described pressure regulator is connected with electrical network, the output terminal of described pressure regulator is connected with the input end of described insulate step-down transformer, the output terminal of described insulate step-down transformer is connected with the input end of described rectifier bridge, the positive output end of described rectifier bridge, described first filter inductance, first current-limiting inductance, described first switch, one end of described first isolation capacitance and described RCL bridge test instrument connects successively, the negative output terminal of described rectifier bridge, described second filter inductance, described second current-limiting inductance, described second switch, the other end of described second isolation capacitance and described RCL bridge test instrument connects successively, the two ends of described connectivity port are connected with described first switch and the common node of described first isolation capacitance and the common node of described second switch and described second isolation capacitance respectively, and the two ends of described 3rd switch are connected with described first switch and the common node of described first isolation capacitance and the common node of described second switch and described second isolation capacitance respectively.
2. the test macro of smoothing reactor sensibility reciprocal according to claim 1, it is characterized in that, also comprise filter capacitor, the two ends of described filter capacitor are connected with described first filter inductance and the common node of described first current-limiting inductance and the common node of described second filter inductance and described second current-limiting inductance respectively.
3. the test macro of smoothing reactor sensibility reciprocal according to claim 1 and 2, is characterized in that, described pressure regulator is carbon brush type pressure regulator.
4. the test macro of smoothing reactor sensibility reciprocal according to claim 3, is characterized in that, described pressure regulator is induction voltage regulator.
5. the test macro of smoothing reactor sensibility reciprocal according to claim 1, is characterized in that, the capacitance of described first capacitance and described second capacitance is more than or equal to 4700 μ F.
6. the test macro of smoothing reactor sensibility reciprocal according to claim 1, is characterized in that, the inductance value of described first current-limiting inductance and described second current-limiting inductance is all more than or equal to the inductance value 100 times of described tested smoothing reactor.
7., based on a method of testing for the test macro of the smoothing reactor sensibility reciprocal described in any one of claim 1-6, it is characterized in that comprising the following steps:
S1, open RCL bridge test instrument, disconnect the first switch and second switch and closed 3rd switch, described RCL bridge test instrument is reset.
8.S2, keep described first switch, described second switch to disconnect, and described 3rd switch is disconnected, obtain the first unloaded inductance value L of the tested smoothing reactor that described RCL bridge test instrument records
o1;
S3, closed described first switch, described second switch, described 3rd switch remains open, and described pressure regulator and electrical network is disconnected, and then obtains the second unloaded inductance value L that described RCL bridge test instrument records
o2;
S4, according to described first unloaded inductance value L
o1and described first unloaded inductance value L
o2calculate inductance rate of change Y, wherein Y=(L
o2-L
o1)/L
o1;
The voltage of input end of S5, adjustment pressure regulator make described tested smoothing reactor on the electric current that flows through be the rated current of this tested smoothing reactor, obtain the load inductance value L that now described RCL electric bridge records
1;
S6, revise described load inductance value L according to described inductance rate of change Y
1to obtain final actual inductance value L, wherein L=L
1* (1-Y).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106093642A (en) * | 2016-06-08 | 2016-11-09 | 福州大学 | Capacitance characteristic measuring circuit under a kind of any AC carrier and method thereof |
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| CN106093642B (en) * | 2016-06-08 | 2019-02-01 | 福州大学 | Capacitance characteristic measuring circuit and its method under a kind of any AC carrier |
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|---|---|
| CN105548724B (en) | 2018-08-10 |
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