CN2088257U - A.c. voltage power type current detector with compensator - Google Patents
A.c. voltage power type current detector with compensator Download PDFInfo
- Publication number
- CN2088257U CN2088257U CN 91200312 CN91200312U CN2088257U CN 2088257 U CN2088257 U CN 2088257U CN 91200312 CN91200312 CN 91200312 CN 91200312 U CN91200312 U CN 91200312U CN 2088257 U CN2088257 U CN 2088257U
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- China
- Prior art keywords
- current
- utility
- diode
- current detecting
- sampling
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Abstract
The structure of the utility model is that two anti-parallel-connection offset diodes z [2] are respectively connected with the secondary sample branches 3*R [0] in series of the three AC mutual inductors of a prior current detecting device in an AC voltage source in order to change the nonlinear relation between the sampling voltage U[i] and the load current I[d] of the prior current detecting device into a linear relationship. Thus the problems that the light load oscillation is serious, failure often occurs on positive and negative commutation and the production can only be maintained in a lower dynamic or static index of the speed system of the power supply of the unidirectional controlled silicon formed by adopting the original current detecting mode. The utility model has novel structure, simplicity, easy operation, economy and utility and obtains an excellent effect on the reformation of a practical mill transmission system.
Description
The utility model belongs to electric automatization control field, and particularly belonging to has the alternating-current voltage source of compensation system formula current sensing means.
In the Direct Current Governor System of existing controllable silicon power supply, generally all adopt the double loop speed-regulating system that is made of speed ring, electric current loop, and the used current actual value sampling method of its electric current loop generally has two kinds: a kind of is by direct current instrument transformer direct sample in DC loop; Another kind is to be taken a sample in ac circuit by D.C mutual-inductor.A kind of sampling mode in back is can be divided into dual mode: a kind of is that the Current Transformer Secondary electric current is fallen stream through the secondary mutual inductor, and again through the three-phase commutation bridge rectification, through the pot sampling, its essence is the sampling mode of current source; Another kind is that the D.C mutual-inductor primary current is become alternating voltage through resistance sampling, again this voltage is become direct current through three-phase commutation bridge, take a sample through pot again, its essence is earlier current source to be become voltage source, rectification sampling again, this current detecting mode can be described as tributary voltage source formula current detecting.
There is following shortcoming in this electric current testing: the diode drop of three-phase commutation bridge is a nonlinear element, thus also must present nonlinear relationship between sampling voltage and the output current, and, in special hour of electric current, the no-output electric current; Electric current nonlinear situation hour is very serious.Therefore, in irreversible no underloading system, this current detection circuit still can be kept low index work, and is having relatively high expectations, in speed adjustable range is big, load change is the also bigger bilateral system, will produce underloading vibration and the unreliable phenomenon of reversible switching.
The objective of the invention is and to address these problems, make between sampling voltage and the output current linearly, avoid underloading vibration, guarantee that reversible handover security is reliable.
According to the present invention, two inverse parallel compensation of series connection diode makes between sampling voltage and the load current linear in the D.C mutual-inductor secondary sample resistance branch in alternating-current voltage source formula current detector.If diode in the three phase rectifier bridge circuit and the inverse parallel of being connected compensation diode characteristic are in full accord, then sampling voltage U
iWith output current I
dLinear fully.Even the performance of these two groups of diodes is not exclusively the same, difference is arranged slightly, also can make to present enough good linear relationship between sampling voltage and the output current.
Below in conjunction with accompanying drawing the utility model is elaborated.
Fig. 1 is the schematic diagram of existing alternating-current voltage source formula current sensing means.
Fig. 2 is the family curve of pick-up unit shown in Figure 1.
Fig. 3 is the schematic diagram that the alternating-current voltage source formula current sensing means of compensation system is arranged of the present invention.
As shown in Figure 1, common alternating-current voltage source formula current sensing means is by three D.C mutual-inductor LHa, LHb, LHc, three-phase current sampling slip 3 * R
0(by 3 resistance R
01～R
03Form), three phase rectifier bridge circuit Z
1(by 6 diode Z
11～Z
16Form), sampling pot R
1, the reversible fully controlled bridge SCR of controllable silicon, smoothing reactor L, line contactor XLC interconnects and forms.In this current sensing means, sampling voltage U
iWith output current I
dBetween the pass be:
U
i＝2.34（IaK
i·R
0－U
0）K
R1
＝1.91K
iK
R1K
0Id－2.34K
R1U
0… …（1）
In the formula, Ia=AC side line current;
I
d=DC side line current, Ia=0.816I
d
K
R1=pot R
1Intrinsic standoff ratio;
K
iFirst and second current ratio of=current transformer LH;
U
01Diode Z in the=three-phase commutation bridge
1Tube voltage drop.
(1) U in the formula
0Itself promptly be a nonlinear element, its family curve such as Fig. 2
aShown in.So U
i=f(I
d) also be non-linear and work as I
dSpecial hour, U
iNo-output, I
dHour, non-linear very serious (seeing Fig. 2 b) has only the I of working as
dWhen big, U
i=f(I
d) just near linear.
The utility model as shown in Figure 3 is characterized in that at original D.C mutual-inductor two sample resistances 3 * R
0Three resistance R
01～R
03Seal in two antiparallel compensation diode Z in the branch road respectively
2, promptly at R
01Seal in antiparallel Z in the branch road
21, Z
22, at R
02Seal in antiparallel Z in the branch road
23, Z
24, at R
03Seal in antiparallel Z in the branch road
25, Z
26, form new sampling slip.This new sampling slip fundamentally changes with the relation between output current and the sampling voltage.Because the funtcional relationship between sampling voltage in this pick-up unit and the load current Id is:
U
i＝2.34［（Ia·K
i·R
0＋U
02）－U
01］K
R1
＝1.91K
R1·K
i·R
0Id＋2.34K
R1（U
02－U
01） … …（2）
U in the formula
02It is the tube voltage drop of compensation diode.Two utmost point Z in the three-phase bridge circuit
11～Z
16With compensation diode Z
21～Z
26Characteristic when identical, (2) formula becomes
U
i＝1.91K
R1·K
i·R
0·Id … …（3）
U
iAnd I
dLinear fully.Even Z
1And Z
2Characteristic difference is arranged slightly in addition, in (2) formula second compares with first, also is inappreciable, can reach the required linearity of engineering fully.
The application of the utility model on the frame main transmission speed control system of certain factory's 650 5 frame cold continuous rolling obtains good effect.Use folk prescription that original current detecting mode constitutes when the speed system of controllable silicon power supply, the underloading vibration is serious, and positive anti-switching is often failed, and can only keep production under lower sound attitude index.When adopting current sensing means of the present utility model, underloading vibration and handoff failure problem have thoroughly been eliminated.
Claims (1)
1, a kind of by D.C mutual-inductor LH, three-phase current sampling slip 3 * R
0(3 resistance R
01～R
03), three-phase commutation bridge Z
1(6 diode Z
11～Z
16), sampling pot R
1, the current sensing means formed of the reversible fully controlled bridge SCR of controllable silicon, it is characterized in that D.C mutual-inductor secondary sample branch road 3 * R
0In seal in two antiparallel compensation diode Z respectively
2, promptly at R
01Seal in antiparallel diode Z in the branch road
21, Z
22, at R
02Seal in inverse parallel diode Z in the branch road
23, Z
24, at R
03Seal in inverse parallel diode Z in the branch road
25, Z
26
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91200312 CN2088257U (en) | 1991-01-07 | 1991-01-07 | A.c. voltage power type current detector with compensator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91200312 CN2088257U (en) | 1991-01-07 | 1991-01-07 | A.c. voltage power type current detector with compensator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2088257U true CN2088257U (en) | 1991-11-06 |
Family
ID=4911308
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91200312 Withdrawn CN2088257U (en) | 1991-01-07 | 1991-01-07 | A.c. voltage power type current detector with compensator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2088257U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100437124C (en) * | 2003-11-27 | 2008-11-26 | 旦菲斯克公司 | A detector circuit to be used for measuring current |
| CN102109548A (en) * | 2009-12-23 | 2011-06-29 | 力博特公司 | Current detection circuit with current compensation and temperature compensation |
| CN113195885A (en) * | 2018-12-25 | 2021-07-30 | 三菱电机株式会社 | Ion current detection circuit, ignition control device and ignition system |
-
1991
- 1991-01-07 CN CN 91200312 patent/CN2088257U/en not_active Withdrawn
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100437124C (en) * | 2003-11-27 | 2008-11-26 | 旦菲斯克公司 | A detector circuit to be used for measuring current |
| CN102109548A (en) * | 2009-12-23 | 2011-06-29 | 力博特公司 | Current detection circuit with current compensation and temperature compensation |
| CN102109548B (en) * | 2009-12-23 | 2013-11-06 | 力博特公司 | Current detection circuit with current compensation and temperature compensation |
| CN113195885A (en) * | 2018-12-25 | 2021-07-30 | 三菱电机株式会社 | Ion current detection circuit, ignition control device and ignition system |
| US11293396B2 (en) | 2018-12-25 | 2022-04-05 | Mitsubishi Electric Corporation | Ion current detection circuit, ignition control apparatus, and ignition system |
| CN113195885B (en) * | 2018-12-25 | 2022-08-09 | 三菱电机株式会社 | Ion current detection circuit, ignition control device and ignition system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |