CN117146664A - Digital electronic detonator protection circuit - Google Patents
Digital electronic detonator protection circuit Download PDFInfo
- Publication number
- CN117146664A CN117146664A CN202311149876.8A CN202311149876A CN117146664A CN 117146664 A CN117146664 A CN 117146664A CN 202311149876 A CN202311149876 A CN 202311149876A CN 117146664 A CN117146664 A CN 117146664A
- Authority
- CN
- China
- Prior art keywords
- diode
- control chip
- electrolytic capacitor
- zener diode
- electronic detonator
- 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.)
- Withdrawn
Links
- 239000003990 capacitor Substances 0.000 claims abstract description 47
- 238000002955 isolation Methods 0.000 claims abstract description 14
- 230000000977 initiatory effect Effects 0.000 claims description 5
- 239000004065 semiconductor Substances 0.000 abstract description 6
- 238000000034 method Methods 0.000 abstract description 5
- 238000005422 blasting Methods 0.000 description 6
- 238000004880 explosion Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 239000002360 explosive Substances 0.000 description 2
- 230000005764 inhibitory process Effects 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005474 detonation Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000006855 networking Effects 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
- F42C19/00—Details of fuzes
- F42C19/08—Primers; Detonators
- F42C19/12—Primers; Detonators electric
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
- F42C11/00—Electric fuzes
- F42C11/06—Electric fuzes with time delay by electric circuitry
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
- F42C15/00—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges
- F42C15/40—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges wherein the safety or arming action is effected electrically
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Air Bags (AREA)
Abstract
A zener diode is arranged between the positive electrode of an electrolytic capacitor and a charging pin of a control chip, the positive electrode of the zener diode is connected with the charging pin of the control chip, the negative electrode of the zener diode is connected with the positive electrode of the electrolytic capacitor, and a reference ground plane pin of the control chip is connected with the negative electrode of the electrolytic capacitor. The current flowing out of the electrolytic capacitor is limited by the zener diode. When current pulse enters the control chip, even if the current pulse breaks down a semiconductor tube in the control chip, the total consumption current of the electrolytic capacitor is related to the Zener diode and is irrelevant to the current of the electrolytic capacitor extracted by the control chip, so that the electrolytic capacitor can normally supply power to the control chip and the isolation protection circuit. The method is simple in implementation mode, safe and reliable, effectively protects the electrolytic capacitor and avoids the phenomenon of blind cannon.
Description
Technical field:
the invention belongs to the technical field of electronic detonators, and relates to a digital electronic detonator protection circuit.
The background technology is as follows:
in recent years, with the development of civil explosive devices, the explosion technology and process are continuously perfected, particularly the development and application of digital electronic technology, digital electronic detonators are rapidly developed in China, and the digital electronic detonators are widely applied to environments such as surface blasting, underground blasting, tunneling blasting and the like. Compared with the traditional detonator, the digital electronic detonator has relatively higher production cost, but the digital electronic detonator is known through a large number of actual blasting, has the advantages of accurate time delay, simple and convenient networking, no section limitation and the like compared with the traditional detonator, and is more beneficial to the management and control of a public security system.
However, in some complex environments, such as pile foundations, wading surfaces, etc., the defect of high probability of blind cannons is also particularly obvious. The basic reason is that when the digital electronic detonator is assembled, due to the fact that the detonation delay is different in each digital electronic detonator, the digital electronic detonators detonated firstly, and the like are combined, induced voltage, induced current, surge current and the like can be generated at the foot line input end of the digital electronic detonator which is not blasted, a semiconductor tube in the control module is easy to break down, the capacitive load is increased, the capacitor discharge is accelerated, and blind shots appear finally due to insufficient capacitance and electric quantity; or other pulse superposition effects, the digital electronic detonator is accessed through foot line crosstalk, so that an internal control module is abnormal, the capacitance load is increased, and the final blind gun phenomenon is generated.
In the prior art, protection is added to the input stage of the control module of the digital electronic detonator, common mode and differential mode inhibition is increased, but the control module is limited by the requirements of the digital electronic detonator structure, and the inhibition to part of strong interference signals is limited, so that the phenomenon of explosion rejection is also caused in a worse explosion environment.
The invention comprises the following steps:
in order to overcome the defects, the invention provides a digital electronic detonator protection circuit.
The invention solves the technical problems by adopting the technical scheme that:
a digital electronic detonator protection circuit comprising: a pair of pin lines TP and TN connected with the input lead, a rectifier bridge, a control chip U, an isolation protection circuit G, an electrolytic capacitor C, an ignition bridge wire Rw and a zener diode Z R ；
The pin lines TP and TN are respectively connected with the input end of the rectifier bridge, and the output positive end A of the rectifier bridge is connected with the power end Vcc of the control chip U through the isolation protection circuit G; the output negative terminal B of the rectifier bridge is connected with the reference ground plane pin Vss of the control chip U and the negative terminal of the electrolytic capacitor C; the zener diode Z R The positive terminal P of the Zener diode Z is connected with the charge pin HVout of the control chip U R The negative terminal N of the ignition bridge wire Rw is connected with the positive electrode of the electrolytic capacitor C and one end of the ignition bridge wire Rw, and the other end of the ignition bridge wire Rw is connected with the ignition switch port g of the control chip U.
The rectifier bridge comprises a first diode D 1 Second diode D 2 Third diode D 3 And a fourth diode D 4 First diode D 1 Cathode of (D) and second diode D 2 The anode of the electronic detonator is connected with a pin line TP of the electronic detonator; third diode D 3 Anode of (D) and fourth diode D 4 The cathode of the electronic detonator is connected with the other pin line TN of the electronic detonator; second diode D 2 Cathode of (D) and third diode D 3 The cathode of the rectifier bridge is connected with an output positive electrode terminal A serving as a rectifier bridge; first diode D 1 Anode of (D) and fourth diode D 4 Is connected as the output negative terminal B of the rectifier bridge.
The zener diode Z R The parameters of (1) need to satisfy:
V Z ≤V cmin -V g and, I F ≥I ccmax And, I eu ≤I R ≤I eu *3/2，
Wherein V is cmin Is the minimum voltage of the capacitor before detonator initiation, V z Is a zener diode Z R Reverse threshold voltage of V g Is the actual power supply voltage of the digital electronic detonator; i ccmax Is the maximum charging current of the electrolytic capacitor C, I F Is a zener diode Z R Is used for the positive working current of the (a); i eu To control the sum of the working currents of the chip U and the isolation protection circuit G, I R Is the reverse leakage current of the zener diode.
By adopting the technical scheme, the invention has the following advantages:
the digital electronic detonator protection circuit provided by the invention is simple, safe and reliable, and fully utilizes the zener diode Z R Effectively realizes the protection of the electrolytic capacitor, namely, the current pulse breaks down the semiconductor tube in the control chip U, and the total consumption current I of the electrolytic capacitor C ce And zener diode Z R Is the reverse leakage current I of (1) R And the electrolytic capacitor C is used for normally supplying power to the control chip U and the isolation protection circuit G, so that the phenomenon of blind cannon occurrence caused by insufficient capacitance and electric quantity due to interference in the actual blasting process is avoided.
Description of the drawings:
FIG. 1 is an electrical schematic of the present invention;
the specific embodiment is as follows:
for the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
As shown in fig. 1, the control circuit of the digital electronic detonator comprises a pair of pin wires TP and TN connected with the input wires, a rectifier bridge, a control chip U, an isolation protection circuit G, an electrolytic capacitor C and an ignition bridge wire Rw.
The rectifier bridge comprises four diodes, namely a first diode D 1 Second diode D 2 Third diode D 3 And a fourth diode D 4 First diode D 1 Cathode of (D) and second diode D 2 The anode of the electronic detonator is connected with a pin line TP of the electronic detonator; third diode D 3 Anode of (D) and fourth diode D 4 The cathode of the electronic detonator is connected with the other pin line TN of the electronic detonator; second diode D 2 Cathode of (D) and third diode D 3 Is used as a rectifier bridgeThe output positive terminal A is connected with the power supply terminal Vcc of the control chip U through the isolation protection circuit G; first diode D 1 Anode of (D) and fourth diode D 4 The anode of the control chip U is connected with the reference ground plane pin Vss of the control chip U and the cathode of the electrolytic capacitor C; the other end of the ignition bridge wire Rw is connected with an ignition switch g of the control chip U. A Zener diode Z is arranged between the positive electrode of the electrolytic capacitor C and a charging pin HVout of the control chip U R Zener diode Z R The positive terminal P of (1) is connected with the charge pin HVout of the control chip U, the zener diode Z R The negative terminal N of the control chip U is connected with the positive electrode of the electrolytic capacitor C, and the reference ground plane pin Vss of the control chip U is connected with the negative electrode of the electrolytic capacitor C. Through zener diode Z R Limiting the current flowing out of the electrolytic capacitor C.
During normal operation, the exploder communicates with the digital electronic detonator and supplies power through the lead wires TP/TN, the control chip U receives a charging control instruction sent by the exploder, and the exploder passes through the zener diode Z R The electrolytic capacitor C is charged to a set charging voltage Vc. In the charging process, the charging current I cc As the voltage across the electrolytic capacitor C gradually increases and gradually decreases.
The detonating device sends out a detonating command, the detonating command is sent to a control chip U of the digital electronic detonator in a carrier wave mode through the rectifier bridge, the detonating device stops supplying power, the electrolytic capacitor C starts to supply power to the isolation protection circuit G and the control chip U, and the power supply current is I eu . Total consumption current change interval of electrolytic capacitor C: i ce ＝I eu ～I R After the delay time set in the control chip U reaches, the control chip U turns on the ignition switch g, and the electrolytic capacitor C discharges through the ignition bridge wire Rw to detonate the electronic detonator.
However, in the above-mentioned ideal case, in reality, with the initiation of other electronic detonators, the explosion of the explosive causes electromagnetic interference to generate current pulses, and then the current pulses are induced on the pin lines of the initiating electronic detonators, and the current pulses enter the control chip U from the pin lines TP/TN, without the zener diode Z R If the semiconductor tube inside the control chip U is broken down,the current of the electrolytic capacitor C extracted by the control chip U is instantaneously increased, so that the electrolytic capacitor C is strongly discharged, the voltage at two ends of the electrolytic capacitor C can be rapidly reduced to 0, the electrolytic capacitor C cannot continuously supply power to the control chip U and the isolation protection circuit G, the control chip U is stopped, and the digital electronic detonator cannot detonate.
At this time, the zener diode Z is shown R When a current pulse enters the control chip U, the total consumption current I of the electrolytic capacitor C is reduced even if the current pulse breaks down a semiconductor tube inside the control chip U ce And zener diode Z R Is the reverse leakage current I of (1) R And the electrolytic capacitor C is irrelevant to the current of the electrolytic capacitor C extracted by the control chip U, so that the control chip U and the isolation protection circuit G are normally powered. Here zener diode Z R The voltage of the electrolytic capacitor C of the conventional exploder is low and is generally about 20V, and the voltage is reversely applied to the diode, so that the voltage can not reach the reverse breakdown voltage of the diode, and the circuit is in a cut-off state, the formed reverse current is of the order of nA, and is far smaller than the normal power supply requirement of the internal delayer and the protection circuit of the control chip U, and the zener diode is required to normally supply power to the internal delayer and the protection circuit of the control chip U in order to ensure that the zener diode can meet the requirement R Further limiting the parameters of (a).
According to actual requirements, testing the normal working current I of the digital electronic detonator module eu ；
Further, the maximum charge current of the capacitor is measured as I ccmax ；
Further, the actual power supply voltage V of the digital electronic detonator is measured g 。
For a selected zener diode Z R The following conditions are required to be satisfied:
1) Satisfy V Z ≤V cmin -V g Wherein V is cmin Is the minimum voltage of the capacitor before detonator initiation, V z Is a zener diode Z R Is the reverse threshold voltage of (a);
2) Meet the maximum charging powerStream I F ≥I ccmax ,I F Is a zener diode Z R I is the forward operating current of (1) ccmax Is the maximum charging current of the electrolytic capacitor C;
3) Satisfy I eu ≤I R ≤I eu *3/2，I R Is the reverse leakage current of the zener diode.
The adopted zener diode Z can be determined according to the above 3 conditions R 。
The design is safe and reliable, and the zener diode Z is fully utilized R Effectively realizes the protection of the electrolytic capacitor, namely, the current pulse breaks down the semiconductor tube in the control chip U, and the total consumption current I of the electrolytic capacitor C ce And zener diode Z R Is the reverse leakage current I of (1) R And the electrolytic capacitor C is used for normally supplying power to the control chip U and the isolation protection circuit G, so that the phenomenon of blind cannon occurrence caused by insufficient capacitance and electric quantity due to interference in the actual blasting process is avoided.
The above is not described in detail in the prior art.
Claims (3)
1. A digital electronic detonator protection circuit comprising: a pair of pin lines TP and TN connected with the input lead, a rectifier bridge, a control chip U, an isolation protection circuit G, an electrolytic capacitor C, an ignition bridge wire Rw and a zener diode Z R ；
The pin lines TP and TN are respectively connected with the input end of the rectifier bridge, and the output positive end A of the rectifier bridge is connected with the power end Vcc of the control chip U through the isolation protection circuit G; the output negative terminal B of the rectifier bridge is connected with the reference ground plane pin Vss of the control chip U and the negative terminal of the electrolytic capacitor C; the zener diode Z R The positive terminal P of the Zener diode Z is connected with the charge pin HVout of the control chip U R The negative terminal N of the ignition bridge wire Rw is connected with the positive electrode of the electrolytic capacitor C and one end of the ignition bridge wire Rw, and the other end of the ignition bridge wire Rw is connected with the ignition switch port g of the control chip U.
2. The digital electronic detonator anti-interference circuit of claim 1 wherein: the rectifier bridge comprises a first diode D 1 Second diode D 2 Third diode D 3 And a fourth diode D 4 First diode D 1 Cathode of (D) and second diode D 2 The anode of the electronic detonator is connected with a pin line TP of the electronic detonator; third diode D 3 Anode of (D) and fourth diode D 4 The cathode of the electronic detonator is connected with the other pin line TN of the electronic detonator; second diode D 2 Cathode of (D) and third diode D 3 The cathode of the rectifier bridge is connected with an output positive electrode terminal A serving as a rectifier bridge; first diode D 1 Anode of (D) and fourth diode D 4 Is connected as the output negative terminal B of the rectifier bridge.
3. The digital electronic detonator anti-interference circuit of claim 1 wherein: the zener diode Z R The parameters of (1) need to satisfy:
V Z ≤V cmin -V g and, I F ≥I ccmax And, I eu ≤I R ≤I eu *3/2，
Wherein V is cmin Is the minimum voltage of the capacitor before detonator initiation, V z Is a zener diode Z R Reverse threshold voltage of V g Is the actual power supply voltage of the digital electronic detonator; i ccmax Is the maximum charging current of the electrolytic capacitor C, I F Is a zener diode Z R Is used for the positive working current of the (a); i eu To control the sum of the working currents of the chip U and the isolation protection circuit G, I R Is the reverse leakage current of the zener diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311149876.8A CN117146664A (en) | 2023-09-06 | 2023-09-06 | Digital electronic detonator protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311149876.8A CN117146664A (en) | 2023-09-06 | 2023-09-06 | Digital electronic detonator protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117146664A true CN117146664A (en) | 2023-12-01 |
Family
ID=88902300
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311149876.8A Withdrawn CN117146664A (en) | 2023-09-06 | 2023-09-06 | Digital electronic detonator protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117146664A (en) |
-
2023
- 2023-09-06 CN CN202311149876.8A patent/CN117146664A/en not_active Withdrawn
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20231201 |
|
| WW01 | Invention patent application withdrawn after publication |