Method and system for measuring resistance value of electronic detonator communication bus on line

Abstract

The invention relates to the technical field of electronic detonators, in particular to a method and system for measuring the resistance value of a communication bus of an electronic detonator on line. The systemcomprises an exploder current measuring circuit and a detonator chip current reverse pull circuit, the exploder leakage current measuring circuit comprises an exploder microcontroller U1,an operational amplifier U7, a switching tube Q4A, a switching tube Q7A, a resistor R21, resistors R23 and R24, resistors R25, R27, R29, R31, R32 and R45 and a bus interface LG1; the detonator chip current reverse pull circuit comprises a switching tube Q1, a rectifying circuit D1, a communication module U2, a driving circuit U3, a logic control unit U5 and a resistor R3. According to the invention, the resistance value of the electronic detonator bus can be measured by utilizing the exploder current measuring circuit and the exploder chip current reverse pull circuit, so that the field construction efficiency is improved, and the problems of unstable communication, insufficient loading capacity, explosion rejection and the like caused by unqualified bus resistance are effectively avoided.

Description

technical field [0001] The invention relates to the technical field of electronic detonators, in particular to a method and system for online measurement of the resistance value of a communication bus of an electronic detonator. Background technique [0002] Before the detonation of the electronic detonator, all the detonators are connected to the detonator with the busbar, and the detonator communicates with the detonator through the busbar. In order to achieve the ideal communication distance and effect, a busbar with a small resistivity must be used. If the resistivity of the busbar is too large, it is easy to cause communication Shorter distances, fewer connected detonators, unstable communication, and other problems will affect the construction period of the site and cause economic losses in minor cases, and may endanger the lives of construction workers in severe cases. However, the resistivity of the bus bar should not be too small, otherwise it will lead to a substan...

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Problems solved by technology

[0002] Before the detonation of the electronic detonator, all the detonators are connected to the detonator with the busbar, and the detonator communicates with the detonator through the busbar. In order to achieve the ideal communication distance and effect, a busbar with a small resistivity must be used. If the resistivity of the busbar is too large, it is easy to cause communication Shorter distance, less number of connected detonators, unstable communication and other problems will affect the on-site construction period and cause economic losses in slight cases, and may endanger the lives of construction workers in severe cases.

However, the resistivity of the bus bar should not be too small. If it is too small, the cost will increase significantly, which is not conducive to the large-scale promotion and use of electronic detonators.

Therefore, it is necessary to pre-measure the resistance of the busbar. The resistivity of the busbar should not exceed 6 ohms / 100m. The closer to 6 ohms / 100m, the better. The total resistance of the busbar should not exceed 75-80 ohms. The application number is 201410354906.3 Chinese patent The document announced "a detonator with network resistance measurement and adaptive pressurization", including resistance measurement circuit, charging voltage measurement circuit and charging control circuit, applying a fixed voltage to the network, and using a microcontroller to measure The voltage on the sampling resistor calculates the network current, and then calculates the total network resistance, because the bridge wires and bus bars of all electric detonators are connected in series, all calculated network resistance indirectly calculates the bus resistance, and All electronic detonators are connected in parallel with the bus bar, and the end of the detonator connected to the bus bar is in a high-impedance state, so this prior art device cannot be used on the electronic detonator

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