CN2444243Y - Circuit of protector of electric source and ammeter for ion pump - Google Patents
Circuit of protector of electric source and ammeter for ion pump Download PDFInfo
- Publication number
- CN2444243Y CN2444243Y CN 00253666 CN00253666U CN2444243Y CN 2444243 Y CN2444243 Y CN 2444243Y CN 00253666 CN00253666 CN 00253666 CN 00253666 U CN00253666 U CN 00253666U CN 2444243 Y CN2444243 Y CN 2444243Y
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- CN
- China
- Prior art keywords
- ionic pump
- reometer
- diode
- ammeter
- resistance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
The utility model comprises an ammeter PA, a resistor R, a capacitor C, diodes VD2, VD1, and an actuating component KA, wherein, the resistor R is connected in series with the ammeter PA. The series circuit is connected in parallel with the capacitor C, the diodes VD2, VD1, a the actuating component KA in sequence. The series circuit and the diode VD2 are connected in parallel in the reverse direction. The actuating component KA is a normally open contact. The utility model is used for overload protection for an ionic pump power load current measurement ammeter, particularly be used for overload protection for a thermal device which is an ionic pump current measurement ammeter of a microwave fast regulating tube and an ionic pump ammeter which applies an ionic pump vacuum extractor.
Description
The utility model relates to a kind of reometer holding circuit; relate in particular to a kind of ionic pump source current table protector circuit; it is used for ionic pump power source loads current measurement reometer is carried out overload protection, is used for that particularly HIGH-POWERED MICROWAVES klystron hot-test equipment ion pump current is measured ammeter and carries out overload protection with the ion pump current table of using the ionic pump vaccum-pumping equipment.
The HIGH-POWERED MICROWAVES klystron is the high vacuum device, for keeping its good vacuum characteristic, all has ionic pump structure, ionic pump power supply just to provide the necessary DC power supply device of ionic pump work on the body.By can extrapolate the situation of vacuum tightness to the measurement of gas current in the ionic pump.So every ionic pump power supply all has the ion pump current table that detects its loading condition.
High vacuum device and system are when vacuum state is good, and ion pump current monitors that near zero or within several microamperes the ion pump current table of vacuum tightness is often selected 50 microamperes of ranges for use.For various reasons, the situation that vacuum tightness descends suddenly often may appear in high vacuum device and system, and this moment, the load of ionic pump was uprushed to hundreds of microampere or bigger value, if not reasonably protection, therefore reometer can be damaged.
Using at present more protector circuit, is the electric capacity of a value in parallel≤1 μ F on 50 micro aning ammeters of gas current in measuring ionic pump, an executive component in parallel with it again, and this executive component has three kinds.One is a normal opened contact; Its two, be a manual switch; Its three, be a diode.In first kind of mode, when executive component moved, the normal opened contact closure can the short-circuit current table, prevents the impact of long-time outrange electric current to reometer, and this protected mode is many to be adopted in the ionic pump power-supply device of high-power klystron.In the second way, when needs read electric current, open hand switch, the most of the time reometer is by the hand switch short circuit, this mode is many to be adopted in the ionic pump vacuum equipment, wherein said hand switch can be selected hand switch for use, also can select the pushbutton switch that can return elastically for use, and the third mode is comparatively common.
Facts have proved that adopt above-mentioned three kinds of protected modes, the pointer of reometer is still often bended, reometer is damaged, the reometer of having to often change.
The purpose of this utility model is to overcome above-mentioned deficiency of the prior art and provides a kind of when microampere meter is operated in a small amount of journey retaining; can guarantee 1.0-1.5 level measuring accuracy; ability lives to surpass the heavy current impact of many times of ranges again, and the ionic pump source current table protector circuit that reometer is not damaged.
The technical scheme that realizes the utility model above-mentioned purpose is as follows.
Ionic pump source current table protector circuit of the present utility model, comprise reometer PA, capacitor C, electric executive component KA, resistance R, diode VD1 and VD2, wherein resistance R is connected with reometer PA, this series circuit order again is in parallel with capacitor C, diode VD2 and VD1 and executive component KA, and VD2 is a reverse parallel connection; Executive component KA is a normal opened contact.
Ionic pump source current table protector circuit of the present utility model, wherein going back one has shunt and described series circuit to be in parallel.
Ionic pump source current table protector circuit of the present utility model, wherein said diode VD1 and VD2 are silicon diode, and its specified average current I
FRated current I with the ionic pump power supply
HBe directly proportional.
Ionic pump source current table protector circuit of the present utility model, wherein said I
F〉=10～20I
HThe reverse withstand voltage V of described diode VD1 and VD2
RM〉=50-100 volt; Described resistance R should satisfy (R
0+ R) Im≤0.3 volt, R in the formula
0DC internal resistance for reometer; Im is the range of reometer; The power P of described resistance R
R〉=0.5W; Described capacitor C 〉=2.2-10 μ F, withstand voltage 〉=50 volt.
The technique effect of ionic pump source current table protector circuit of the present utility model is:
1, in this protector circuit, increased resistance R, made diode VD1 and VD2 can fine protective current table PA tolerate the impact of big electric current;
2, in this circuit arrangement, increased VD2, reometer PA has been had the reverse protection effect;
3, the link position of capacitor C is different from prior art in this circuit arrangement, and its capacity is bigger, can reduce the AC compounent at reometer P A two ends like this, makes micro aning ammeter satisfy the requirement of measuring accuracy.
Based on above-mentioned 3 points, as load current value I
LDuring≤48 μ A, I=I
L, I
LDuring=50 μ A, I=49 μ A is with I
LIncrease, the shunting action of diode VD1 strengthens, and with the such protector circuit of measurement, works as I as calculated
LDuring=1.29A, the dash current of reometer A is 93 μ A.General silicon diode forward conduction speed is very fast, is the microsecond level, and is therefore fine to the protection effect of reometer.
Below in conjunction with accompanying drawing the utility model ionic pump source current table protector circuit is further described.
Fig. 1 is an ionic pump power principle block diagram.
Fig. 2 is a kind of protector circuit of prior art intermediate ion pumping source reometer.
Fig. 3 is the another kind of protector circuit of prior art intermediate ion pumping source reometer.
Fig. 4 is another protector circuit of prior art intermediate ion pumping source reometer.
Fig. 5 is an ionic pump source current table protector circuit of the present utility model.
As shown in Figure 1, DC current E wherein can realize with multiple modes such as voltage doubling rectifing circuit or switching power circuits; The equivalence of power source loads ionic pump is a resistance R
LR
SIt is the sampling element of ionic pump power supply protector circuit; PA is 50 μ A reometers of measuring ion flow, because measurement range is bigger, general PA has shunt.The protector circuit of PA is the object that the utility model will be protected.
As shown in Figure 2, KA is a pair of normal opened contact of executive component KA among Fig. 1, when KA moves; contact 3 and 4 closures; can short-circuit current table PA, prevent of the impact of long-time outrange electric current to PA, the ionic pump power-supply device of high-power klystron is on the high side with this guard method.KA action setting valve I
L＇ 〉=100～200 μ A, I
L〉=I
LBehind the ＇, KA moves contact 3 and 4 closures, and approximately a few tens of milliseconds, protection speed is too slow.
As shown in Figure 3, SA is a hand switch.Open SA in the time of need reading electric current, most of the time PA is adopted this method in the majority in the ionic pump vacuum equipment by the SA short circuit.SA has selects hand switch for use, and what also have selects the pushbutton switch that can return elastically for use.Because the variation of vacuum tightness is unpredictable, randomness is arranged, when reading reometer PA reading, run into heavy current impact just at the right time, the SA that manually closes again, speed is too slow.
As shown in Figure 4, directly use diode VD and capacitor C in parallel with microampere meter PA also common as holding circuit.But exist the reometer overshoot bigger than normal.50 micro aning ammeter internal resistance R
0Be 2.5K Ω～4K Ω.If 4K is Ω, when reometer is completely inclined to one side, reometer end pressure drop U=ImR
0=0.2V, the about 0.6V of VD1 conducting, if reometer overshoot current I=150 μ A like this is R
0Little, I can be bigger.Secondly the ionic pump structure always has a utmost point to be connected with shell.As Fig. 1, R
LOne end ground connection.Because the C capacity is less, do not guarantee reometer PA measuring accuracy.
As shown in Figure 5, the utility model ionic pump source current table protector circuit, comprise reometer PA, resistance R, capacitor C, diode VD2 and VD1, executive component KA and shunt, wherein resistance R is connected with reometer PA, this series circuit order again is in parallel with capacitor C, diode VD2 and VD1 and executive component KA, and VD2 is a reverse parallel connection; Executive component KA is a normal opened contact.Shunt also is in parallel with the circuit that reometer PA connects with resistance R.Described diode VD1 and VD2 are silicon diode, and its specified average current I
FRated current I with the ionic pump power supply
HBe directly proportional.Described I
F〉=10～20I
HThe reverse withstand voltage V of described diode VD1 and VD2
RM〉=50-100 volt; Described resistance R should satisfy (R
0+ R) Im≤0.3 volt, R0 is the DC internal resistance of reometer in the formula; Im is the range of reometer; The power P of described resistance R
R〉=0.5W; Described capacitor C 〉=2.2-10 μ F, withstand voltage 〉=50 volt.
Adopt the utility model ionic pump source current table protector circuit shown in Figure 5, once did the test of following protection effect.
When this protector circuit was used for the hot scaffold tower of high-power klystron with ionic pump source current table PA, selected parameter was:
The model of reometer PA is 44C2-A50 μ A
Resistance R is RJJ-2K Ω/0.5w
Capacitor C is CJ112-160V-2.2 μ F
Diode VD1 is 2cp15
VD2 is 1N4004
During ionic pump source current table PA that this protector circuit is used for using on the ion pump vacuum system, selected parameter is:
The model of reometer PA is 5,9C5 100 μ A
Resistance R is 1.78K Ω (nonstandard)
Capacitor C is 10 μ F/50V
Diode VD1 and VD2 are 1N4004.
Claims (4)
1, a kind of ionic pump source current table protector circuit, comprise reometer PA, capacitor C and executive component KA, it is characterized in that: also comprise resistance R, diode VD1 and VD2, wherein resistance R is connected with reometer PA, this series circuit order again is in parallel with capacitor C, diode VD2 and VD1 and executive component KA, and VD2 is a reverse parallel connection; Executive component KA is a normal opened contact.
2, ionic pump source current table protector circuit according to claim 1 is characterized in that: also have a shunt and described series circuit to be in parallel.
3, ionic pump source current table protector circuit according to claim 1 and 2, it is characterized in that: described diode VD1 and VD2 are silicon diode, and its specified average current I
FRated current I with the ionic pump power supply
HBe directly proportional.
4, ionic pump source current table protector circuit according to claim 3 is characterized in that: wherein said I
F〉=10～20I
HThe reverse withstand voltage V of described diode VD1 and VD2
RM〉=50-100 volt; Described resistance R should satisfy (R
0+ R) Im≤0.3 volt, R in the formula
0DC internal resistance for reometer; Im is the range of reometer; The power P of described resistance R
R〉=0.5w; Described capacitor C 〉=2.2-10 μ F, withstand voltage 〉=50 volt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00253666 CN2444243Y (en) | 2000-10-12 | 2000-10-12 | Circuit of protector of electric source and ammeter for ion pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00253666 CN2444243Y (en) | 2000-10-12 | 2000-10-12 | Circuit of protector of electric source and ammeter for ion pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2444243Y true CN2444243Y (en) | 2001-08-22 |
Family
ID=33611074
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00253666 Expired - Fee Related CN2444243Y (en) | 2000-10-12 | 2000-10-12 | Circuit of protector of electric source and ammeter for ion pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2444243Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107046409A (en) * | 2017-05-23 | 2017-08-15 | 北京智芯微电子科技有限公司 | A kind of wideband Larger Dynamic automatic gain control circuit of power line carrier, PLC |
| CN107918050A (en) * | 2017-12-18 | 2018-04-17 | 云丁网络技术(北京)有限公司 | A kind of power consumption test system and method |
-
2000
- 2000-10-12 CN CN 00253666 patent/CN2444243Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107046409A (en) * | 2017-05-23 | 2017-08-15 | 北京智芯微电子科技有限公司 | A kind of wideband Larger Dynamic automatic gain control circuit of power line carrier, PLC |
| CN107046409B (en) * | 2017-05-23 | 2020-02-11 | 北京智芯微电子科技有限公司 | Wide-band large dynamic automatic gain control circuit for power carrier communication |
| CN107918050A (en) * | 2017-12-18 | 2018-04-17 | 云丁网络技术(北京)有限公司 | A kind of power consumption test system and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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 |