CN203337739U - Capacitance detection circuit enhancing detection sensitivity and stability and used for capacitance fuse - Google Patents
Capacitance detection circuit enhancing detection sensitivity and stability and used for capacitance fuse Download PDFInfo
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- CN203337739U CN203337739U CN2013202451459U CN201320245145U CN203337739U CN 203337739 U CN203337739 U CN 203337739U CN 2013202451459 U CN2013202451459 U CN 2013202451459U CN 201320245145 U CN201320245145 U CN 201320245145U CN 203337739 U CN203337739 U CN 203337739U
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- triode
- detecting circuit
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Abstract
The utility model discloses a capacitance detection circuit enhancing detection sensitivity and stability and used for a capacitance fuse, which comprises an oscillator circuit, a detection circuit, and two coupling electrodes. The detection circuit comprises resistors R1, R2, R3 and R4, a capacitor C1, a diode D1 and a triode Q2. The detection circuit is characterized in that the base electrode of the triode Q2 is connected with one coupling electrode and the cathode of the diode D1 and meanwhile grounded through the resistor R1; the collector electrode of the triode Q2 is connected with a power supply through the resistor R2; after being connected with the resistor R3 in a parallel way, the capacitor C1 has one end grounded and the other end connected with the anode of the diode D1; meanwhile, the capacitor C1 is connected with the emitting electrode of the triode Q2 through the resistor R4; and a detection voltage output end Ud is led out from the part where the resistor R4 and the capacitor C1 are connected. By increasing the input impedance of the detection circuit, the capacitance detection circuit can enhance the stability of the detection circuit outputting detection voltages and the detection circuit sensitivity to coupling capacitance changes. Furthermore, the capacitance detection circuit has the characteristics of simple realization and good practical effects.
Description
Technical field
The utility model relates to the electric capacity fuze Detection Techniques, is specifically related to a kind of electric capacity fuze capacitive detection circuits that improves detection sensitivity and degree of stability.
Background technology
Capacitance Fuze is the variation of distributed capacitance while utilizing bullet and target to approach and the detection of a target.When fuse approaches target, the interelectrode electric capacity of fuse will change, and the variable quantity of this electric capacity is detected as echo signal and is used, and can control fried point, realize the predetermined height of burst.The raising of the electric capacity fuze height of burst and reliability, depend on that the electric capacity fuze detector is to playing sensitivity and the stability that in the order motion process, between electrode, the small capacitance variation detects.
Summary of the invention
In view of this, the utility model provides a kind of electric capacity fuze capacitive detection circuits that improves detection sensitivity and degree of stability, can improve electric capacity fuze detection sensitivity and stability, thereby improves the height of burst and the reliability of Capacitance Fuze.
This electric capacity fuze capacitive detection circuits, be comprised of pierce circuit, detecting circuit and two coupling electrodes, and pierce circuit is connected with two coupling electrodes respectively one to one with detecting circuit; Described detecting circuit comprises resistance R 1～resistance R 4, capacitor C 1, diode D1 and triode Q2;
The base stage of triode Q2 connects wherein the negative electrode of a coupling electrode and diode D1, simultaneously by resistance R 1 ground connection; The collector of triode Q2 connects power Vcc by resistance R 2; An end ground connection after capacitor C 1 and resistance R 3 are in parallel, the other end connects the anode of diode D1, connects the emitter of triode Q2 by resistance R 4 simultaneously; Resistance R 4 is drawn detecting circuit output terminal U with the junction of capacitor C 1
d.
Beneficial effect:
For the triode detection circuit, the input impedance that at first analyzes detecting circuit sensitivity is low, degree of stability is poor reason and be detecting circuit is lower.So, by adjusting the input impedance of detecting circuit, can improve the degree of stability of detecting circuit output detecting circuit and the susceptibility that coupling capacitance is changed.
Therefore the utility model has increased the resistance R 4 be connected in series between the emitter of triode Q2 and detecting circuit output terminal, adopts this very simply circuit optimization mode, effectively raises the input impedance of detecting circuit.
Only there is several millivolts beating through the improved capacitance probe detecting circuit of the utility model, with the wave detector before not transforming, compare, while carrying out same push pedal experiment, after transformation, the detecting circuit of capacitance probe interchange variable quantity can reach the 100mv left and right, the former electric capacity fuze of remolding sensitivity has improved 5-6 doubly, and the Simultaneous Stabilization degree has also improved 10 times of left and right.
The accompanying drawing explanation
Fig. 1 is the capacitance probe theory diagram.
Fig. 2 is capacitance probe circuit diagram before a kind of adjustment.
Fig. 3 is the capacitance probe circuit diagram after the utility model is adjusted.
Embodiment
Below in conjunction with the accompanying drawing embodiment that develops simultaneously, the utility model is described in detail.
The theory diagram of electric capacity fuze detector as shown in Figure 1, is comprised of pierce circuit, detecting circuit and two coupling electrodes etc.Pierce circuit is connected with two coupling electrodes respectively one to one with detecting circuit, and two coupling electrodes form the front end transducing part that capacitance variations is surveyed.Pierce circuit produces oscillating voltage to be responded to by coupling electrode, forms voltage in detecting circuit, is called detecting circuit U
d.The circuit form of the amplitude of this detecting circuit and oscillating voltage, electrode position, detecting circuit and component parameter etc. are relevant.
The circuit diagram of a kind of electric capacity fuze detector that the applicant uses at present as shown in Figure 2.Wherein the detection form of detecting circuit is the triode detection circuit, utilizes the PN junction of base-emitter-base bandgap grading of triode Q2 to complete the detection task.Through using, find, the oscillating voltage that the detecting circuit of this circuit is come by the coupling electrode induction affects larger, there be tens millivolts beating in detection post-detection voltage, and the detection sensitivity changed for small capacitance is lower, this electric capacity fuze detector is when push pedal is tested, sheet metal target for the 1.5m*1.5m of 0.5m place size, detecting circuit after detection exchanges variable quantity only 20mv, thereby its consequence of bringing is: one comes the height of burst more on the low side, relatively to nearer distance, target could effectively be detected; Two come the fluctuation of detecting circuit can have influence on the reliability of electric capacity fuze.
For further improving detection sensitivity and the reliability of existing electric capacity fuze, need to be improved from the stability of detecting circuit itself and the reaction sensitivity aspect that small capacitance is changed.
Find by analysis, detecting circuit sensitivity is low, the reason of poor reliability is that original detecting circuit exists the lower problem of input impedance while utilizing triode detection.So, by adjusting the detecting circuit of original capacitance probe wave detector part, adjust the input impedance of wave detector, reduce the impact of a pair of oscillators wave detector part, thereby than existing capacitance probe, greatly improve the degree of stability of wave detector output detecting circuit and the susceptibility that coupling capacitance is changed, and then improve the overall sensitivity of capacitance probe.Choosing of R4 resistance do not have specific (special) requirements, as long as make the input impedance of grounded emitter circuit and the input impedance of front grade coupled level reach matching relationship.
Therefore, the utility model provides the electric capacity fuze detector of a kind of high sensitivity and degree of stability, and its circuit diagram as shown in Figure 3.Than the electric capacity fuze detection circuit shown in Fig. 2, increased the resistance R 4 be connected in series between the emitter of triode Q2 and detecting circuit output terminal, be equivalent to adjust the input impedance of detecting circuit, after increasing this resistance, greatly improve the degree of stability of detecting circuit output detecting circuit and the susceptibility that coupling capacitance is changed, and then improve the overall sensitivity of capacitance probe.
Specifically, the electric capacity fuze detection circuit after adjustment specifically is comprised of pierce circuit, detecting circuit and two coupling electrodes.Pierce circuit is connected with two coupling electrodes respectively one to one with detecting circuit.Detecting circuit comprises resistance R 1～R4, capacitor C 1, diode D1 and triode Q2; The base stage of triode Q2 connects wherein a coupling electrode, connects the negative electrode of diode D1, simultaneously by resistance R 1 ground connection; The collector of triode Q2 connects power Vcc by resistance R 2; An end ground connection after capacitor C 1 and resistance R 3 are in parallel, the other end connects the anode of diode D1, connects the emitter of triode Q2 by resistance R 4 simultaneously; Resistance R 4 is drawn detecting circuit output terminal U with the junction of capacitor C 1
d.
Only there is several millivolts beating through the improved capacitance probe detecting circuit of the utility model, when the same sheet metal for the 1.5m*1.5m of 0.5m place size carries out the push pedal experiment, detecting circuit after detection exchanges variable quantity can reach the 100mv left and right, the former electric capacity fuze of remolding sensitivity has improved 5-6 doubly, and the Simultaneous Stabilization degree has also improved 10 times of left and right.
In sum, these are only preferred embodiment of the present utility model, be not intended to limit protection domain of the present utility model.All within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection domain of the present utility model.
Claims (1)
1. an electric capacity fuze capacitive detection circuits, be comprised of pierce circuit, detecting circuit and two coupling electrodes, and pierce circuit is connected with two coupling electrodes respectively one to one with detecting circuit; It is characterized in that, described detecting circuit comprises resistance R 1～resistance R 4, capacitor C 1, diode D1 and triode Q2;
The base stage of triode Q2 connects wherein the negative electrode of a coupling electrode and diode D1, simultaneously by resistance R 1 ground connection; The collector of triode Q2 connects power Vcc by resistance R 2; An end ground connection after capacitor C 1 and resistance R 3 are in parallel, the other end connects the anode of diode D1, connects the emitter of triode Q2 by resistance R 4 simultaneously; Resistance R 4 is drawn detecting circuit output terminal U with the junction of capacitor C 1
d.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013202451459U CN203337739U (en) | 2013-05-08 | 2013-05-08 | Capacitance detection circuit enhancing detection sensitivity and stability and used for capacitance fuse |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013202451459U CN203337739U (en) | 2013-05-08 | 2013-05-08 | Capacitance detection circuit enhancing detection sensitivity and stability and used for capacitance fuse |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203337739U true CN203337739U (en) | 2013-12-11 |
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ID=49706406
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013202451459U Expired - Fee Related CN203337739U (en) | 2013-05-08 | 2013-05-08 | Capacitance detection circuit enhancing detection sensitivity and stability and used for capacitance fuse |
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|---|---|
| CN (1) | CN203337739U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103278697A (en) * | 2013-05-08 | 2013-09-04 | 北京理工大学 | Wave detection method for improving detection sensitivity and stability of capacitance fuze and detection circuit |
-
2013
- 2013-05-08 CN CN2013202451459U patent/CN203337739U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103278697A (en) * | 2013-05-08 | 2013-09-04 | 北京理工大学 | Wave detection method for improving detection sensitivity and stability of capacitance fuze and detection circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131211 Termination date: 20140508 |