CN203337738U - Capacitance detection circuit for capacitance fuse - Google Patents
Capacitance detection circuit for capacitance fuse Download PDFInfo
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- CN203337738U CN203337738U CN2013202450916U CN201320245091U CN203337738U CN 203337738 U CN203337738 U CN 203337738U CN 2013202450916 U CN2013202450916 U CN 2013202450916U CN 201320245091 U CN201320245091 U CN 201320245091U CN 203337738 U CN203337738 U CN 203337738U
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Abstract
The utility model discloses a capacitance detection circuit for a capacitance fuse, which can improve the capacitance fuse detection sensitivity and stability. A detection part in the capacitance detection circuit adopts a circuit form characterized by isolation plus dual-voltage detection. Resistors R3, R4, R5 form a voltage dividing network to lift an oscillation voltage inducted by a coupling electrode to a certain level and further perform isolation and filtering of a filtering network through a voltage follower U1. The rear end of the filtering network is connected with a charging capacitor C5 and a reversely connected diode D1. The two ends of the diode D1 are connected with a diode D2, a resistor R8 and a capacitor C6 which are serially connected. When a signal is in a negative half cycle, the diode D1 is conducted and the capacitor C5 is charged to a signal peak value. When the signal is in a positive half cycle, the signal voltage is then well superposed on the voltage of the capacitor C5 to form a twofold voltage. The diode D1 is reversely biased and cut off. The diode D2 is then conducted. The capacitor C6 is charged to a twofold peak value.
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.
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.
The utility model content
In view of this, the utility model provides a kind of electric capacity fuze capacitive detection circuits, 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 two coupling electrodes are distinguished connection oscillator circuit and detecting circuit one to one;
Described detecting circuit comprises voltage follower U1, capacitor C 4～C6, diode D1 and the D2 that described detecting circuit comprises resistance R 3～R8, connected into by amplifier; Resistance R 4 is connected respectively power Vcc and ground with two ends after resistance R 5 series connection, and the junction of resistance R 4 and resistance R 5 is connected a wherein coupling electrode by resistance R 3, also connects the input end of voltage follower U1 simultaneously; The two ends of capacitor C 4 are respectively by resistance R 6 and resistance R 7 ground connection, and capacitor C 4 one ends connect the output terminal of voltage follower U1, another termination capacitor C 5; The other end of capacitor C 5 is by the diode D1 ground connection of reversal connection; The negative electrode of the anodic bonding diode D1 of diode D2, the negative electrode of diode D2 is by resistance R 8 and capacitor C 6 ground connection of series connection; Detecting circuit output terminal U is drawn in the junction of resistance R 8 and capacitor C 6
d.
Beneficial effect:
The utility model adopts the circuit of isolation+multiplication of voltage detection to replace the triode detection circuit.After adopting the multiplication of voltage detection, when the identical oscillating voltage of input, the detecting circuit of output is original twice, thereby has strengthened the susceptibility that wave detector output detecting circuit changes coupling capacitance.And the buffer action of voltage follower also improves the degree of stability of wave detector output detecting circuit greatly.Than existing capacitance probe, greatly improved the overall sensitivity of capacitance probe.
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 also improves greatly.
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 that the utility model adopts the detection of isolation+multiplication of voltage.
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.
A kind of circuit diagram of existing electric capacity fuze detector 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.Therefore the utility model has been abandoned the triode detection circuit, adopts multiplication of voltage detection principle, improves the susceptibility that wave detector output detecting circuit changes coupling capacitance; Adopt voltage follower to be isolated, improve the degree of stability of wave detector output detecting circuit.Than existing capacitance probe, greatly improved the overall sensitivity of capacitance probe.
The electric capacity fuze detector circuit figure that Fig. 3 is the utility model high sensitivity and degree of stability.As shown in Figure 3, this electric capacity fuze detector is comprised of pierce circuit, detecting circuit and two coupling electrodes.Two coupling electrodes are distinguished connection oscillator circuit and detecting circuit.
Voltage follower U1, capacitor C 4～C6, diode D1 and D2 that detecting circuit comprises resistance R 3～R8, connected into by amplifier.Resistance R 4 is connected respectively voltage vcc and ground with two ends after resistance R 5 series connection, and the junction of resistance R 4 and resistance R 5 is connected a wherein coupling electrode by resistance R 3, also connects the input end of voltage follower U1 simultaneously.Be input to follow-up multiplication of voltage demodulator probe from the oscillating voltage of coupling electrode induction after the isolation of the dividing potential drop of R4 and R5 and voltage follower U1.In the multiplication of voltage demodulator probe, the two ends of capacitor C 4 are respectively by resistance R 6 and resistance R 7 ground connection, and capacitor C 4 one ends connect the output terminal of voltage follower U1, another termination capacitor C 5.The other end of capacitor C 5 is by the diode D1 ground connection of reversal connection; The negative electrode of the anodic bonding diode D1 of diode D2, the negative electrode of diode D2 is by resistance R 8 and capacitor C 6 ground connection of series connection; Detecting circuit output terminal U is drawn in the junction of resistance R 8 and capacitor C 6
d.
The principle of this circuit is as follows:
The oscillating voltage of responding to by coupling electrode, be lifted to certain DC level after R3, R4, R5, the voltage follower U1 realized through transport and placing device is isolated, and R6, R7 and C4 form filter network, when signal is negative half period, the D1 conducting, C5 is charged to the peak value of signal, when signal is positive half cycle, signal voltage just in time with C5 on voltage stack form the voltage of twice, D1 is instead ended partially, and the D2 conducting, so be charged to the peak value of twice to C6.Each signal period all repeats this process later, and C6 is upper just has the signal voltage of twice always.
After adopting the multiplication of voltage detection, when the identical oscillating voltage of input, the detecting circuit of output is original twice, thereby has strengthened the susceptibility that wave detector output detecting circuit changes coupling capacitance.And the buffer action of voltage follower also improves the degree of stability of wave detector output detecting circuit greatly.
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 also improves greatly.
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, two coupling electrodes are connection oscillator circuit and detecting circuit respectively one to one; It is characterized in that voltage follower U1, capacitor C 4～C6, diode D1 and D2 that described detecting circuit comprises resistance R 3～R8, connected into by amplifier;
Resistance R 4 is connected respectively power Vcc and ground with two ends after resistance R 5 series connection, and the junction of resistance R 4 and resistance R 5 is connected a wherein coupling electrode by resistance R 3, also connects the input end of voltage follower U1 simultaneously;
The two ends of capacitor C 4 are respectively by resistance R 6 and resistance R 7 ground connection, and capacitor C 4 one ends connect the output terminal of voltage follower U1, another termination capacitor C 5; The other end of capacitor C 5 is by the diode D1 ground connection of reversal connection; The negative electrode of the anodic bonding diode D1 of diode D2, the negative electrode of diode D2 is by resistance R 8 and capacitor C 6 ground connection of series connection; Detecting circuit output terminal U is drawn in the junction of resistance R 8 and capacitor C 6
d.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013202450916U CN203337738U (en) | 2013-05-08 | 2013-05-08 | Capacitance detection circuit for capacitance fuse |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013202450916U CN203337738U (en) | 2013-05-08 | 2013-05-08 | Capacitance detection circuit for capacitance fuse |
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| Publication Number | Publication Date |
|---|---|
| CN203337738U true CN203337738U (en) | 2013-12-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013202450916U Expired - Fee Related CN203337738U (en) | 2013-05-08 | 2013-05-08 | Capacitance detection circuit for capacitance fuse |
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| Country | Link |
|---|---|
| CN (1) | CN203337738U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103267900A (en) * | 2013-05-08 | 2013-08-28 | 北京理工大学 | Capacitance detection circuit for capacitance fuze |
| CN104345349A (en) * | 2014-10-29 | 2015-02-11 | 上海电机学院 | Fuse detector and detection method thereof |
| CN106646618A (en) * | 2016-09-09 | 2017-05-10 | 上海电机学院 | Capacitive orientation detection circuit |
-
2013
- 2013-05-08 CN CN2013202450916U patent/CN203337738U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103267900A (en) * | 2013-05-08 | 2013-08-28 | 北京理工大学 | Capacitance detection circuit for capacitance fuze |
| CN104345349A (en) * | 2014-10-29 | 2015-02-11 | 上海电机学院 | Fuse detector and detection method thereof |
| CN106646618A (en) * | 2016-09-09 | 2017-05-10 | 上海电机学院 | Capacitive orientation detection circuit |
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Legal Events
| Date | Code | Title | Description |
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| 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 |