Powerless Electronic Detonator Repeater

Abstract

The present invention discloses a powerless electronic detonator repeater. The present invention includes a DCDC DC voltage converter, a rectifier bridge, two high-voltage charging diodes, and two inverting drivers. The two input pins of the repeater are respectively connected to the two AC input terminals of the rectifier bridge, the anodes of the two high-voltage charging diodes, and the input terminals of the two inverting drivers. The input voltage pin of the DCDC DC voltage converter is connected to the DC positive output terminal of the rectifier bridge, and the output voltage pin is connected to the power supply pins of the two inverting drivers. The two output pins of the repeater are respectively connected to the output terminals of the two inverting drivers and the cathodes of the two high-voltage charging diodes. The ground terminal of the DCDC DC voltage converter and the ground terminals of the two inverting drivers are connected to the DC negative output terminal of the rectifier bridge. The present invention has a simple structure, low cost, does not affect the downlink and uplink communication of electronic detonators, supports high-voltage charging, and can effectively overcome the voltage drop generated by long-distance busbars or a large number of electronic detonators.

Description

Technical Field

[0001] The present invention belongs to the technical field of electronic detonators, and particularly relates to a powerless electronic detonator repeater. Background Art

[0002] Compared with non-electric detonators, electronic detonators have functions such as more precise initiation delay time control, initiation energy control, and safety control, and are widely used. Due to the complex blasting scenarios, in some blasting scenarios, a large number of electronic detonators are required, and in some scenarios, the distance between the initiator and the working surface of the detonator is relatively far. Both of these scenarios will cause a large voltage drop on the initiation bus for the working current. If the voltage drop on the initiation bus is too large, the working voltage on the electronic detonator will be less than the minimum rated voltage, resulting in abnormal initiation.

[0003] In order to increase the number of electronic detonators on the bus or support long-line initiation, the commonly used method at present is to increase the working voltage of the initiator on the bus, such as using a working voltage of 16V or 24V; there are also cases of using a repeater with a power supply or an initiator with a repeating function for relaying; there are also cases of using a wireless repeater. For example, the invention patent CN106610253B discloses an electronic detonator initiation system and its control method for communication through a repeater. A repeater and an encoder are used for wireless communication with the initiation controller. Wired communication is carried out between the repeater and the electronic detonator through a signal bus, and power is provided for the electronic detonator. At the same time, the wireless communication signals from the initiation controller and the encoder are forwarded to the electronic detonator in the form of wired communication signals, and the feedback information of various instructions of the electronic detonator in response to the initiation controller and the encoder is returned to the initiation controller and the encoder in the form of wireless communication signals. The wireless transceiver units and power supplies of multiple electronic detonators are integrated on the repeater, and the repeater expands the signal transmission distance of the initiation network. However, the functions of the repeater are complex and the cost is high. If the battery power of the repeater is insufficient, it will affect initiation.

[0004] Increasing the working voltage of the initiator on the bus is a commonly used low-cost solution. However, for safety reasons, some standards have stipulated the upper limit of the communication voltage of the initiator. For example, the group standard T / CEMTA 2-2022 "Technical Conditions for General Industrial Electronic Detonator Initiators" implemented on June 1, 2022 stipulates that the initiator uses a low voltage for communication on the bus. Summary of the Invention

[0005] The purpose of the present invention is to provide a low-cost and easy-to-use electronic detonator repeater for scenarios where existing electronic detonators support a large number of electronic detonators at low voltage or the distance between the initiator and the working surface of the detonator is relatively far.

[0006] The present invention includes a DC-DC DC voltage converter, a rectifier bridge composed of four diodes, two high-voltage charging diodes, and two inverter drivers. The DC input of the DC-DC DC voltage converter is the DC voltage after bus rectification, and the output is a constant rated voltage of electronic detonators, such as 12V and 16V.

[0007] After the cathode of the first diode D1 is connected to the anode of the second diode D2, it is connected to the anode of the first high-voltage charging diode D5 and the input terminal of the first inverter driver INV1, serving as an input pin P of the repeater.

[0008] After the cathodes of the second diode D2 and the third diode D3 are connected, they are connected to the input voltage pin of the DC-DC DC voltage converter DC. The output voltage pin of the DC-DC DC voltage converter DC is connected to the power supply pins of the first inverter driver INV1 and the second inverter driver INV2 to supply power to the two inverter drivers.

[0009] After the anode of the third diode D3 is connected to the cathode of the fourth diode D4, it is connected to the anode of the second high-voltage charging diode D6 and the input terminal of the second inverter driver INV2, serving as another input pin N of the repeater.

[0010] The output terminal of the first inverter driver INV1 is connected to the cathode of the second high-voltage charging diode D6, serving as an output pin PO of the repeater; the output terminal of the second inverter driver INV2 is connected to the cathode of the first high-voltage charging diode D5, serving as another output pin NO of the repeater.

[0011] After the anode of the first diode D1 is connected to the anode of the four diodes D4, it is connected to the ground terminal of the DC-DC DC voltage converter DC, the ground terminal of the first inverter driver INV1, and the ground terminal of the second inverter driver INV2.

[0012] In use, the repeater can be connected in series on the bus. When there are more electronic detonators supported by the electronic detonators at low voltage, or when the distance between the initiator and the working surface of the detonators is far, a large voltage drop will occur on the bus, resulting in the voltage at the input of the DC-DC being much lower than the communication voltage VO of the initiator. The output voltage of the DC-DC is restored to the communication voltage VO of the initiator, and the voltage difference between the output terminals PO and NO is equal to the output voltage VO of the DC-DC, achieving the normal working conditions of the electronic detonators; when the electronic detonators are in high-voltage charging, due to the pressure difference between P and N being greater than VO, high-voltage transmission is achieved through the high-voltage charging diodes D5 or D6; the electronic detonators use current feedback technology. Since the repeater has no battery, all the power is fed back to the bus in real time; therefore, the present invention supports both low-voltage communication and high-voltage charging, and at the same time realizes the relay of the electronic detonator feedback.

[0013] Compared with traditional electronic detonator repeaters or wireless electronic detonator repeaters, the repeater of the present invention has a simple structure, low cost, does not affect the downlink and uplink communication of electronic detonators, supports high-voltage charging, can effectively overcome the voltage drop generated by long-distance busbars or a large number of electronic detonators, and increases the usage scenarios of electronic detonators. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a circuit schematic diagram of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] The present invention will be further described below in conjunction with the drawings and embodiments.

[0016] As Figure 1 shown, a powerless electronic detonator repeater includes a DCDC DC voltage converter, a rectifier bridge, two high-voltage charging diodes, and two inverting drivers. The DC input of the DCDC DC voltage converter is the DC voltage rectified from the busbar, and the output is a constant rated voltage of the electronic detonator, such as 12V or 16V.

[0017] The rectifier bridge is composed of four diodes. Among them: the cathode of the first diode D1 is connected to the anode of the second diode D2, serving as an AC input terminal of the rectifier bridge; the cathode of the second diode D2 and the cathode of the third diode D3 are connected, serving as the DC positive output terminal of the rectifier bridge; the anode of the third diode D3 is connected to the cathode of the fourth diode D4, serving as the other AC input terminal of the rectifier bridge; the anode of the first diode D1 and the anode of the fourth diode D4 are connected, serving as the DC negative output terminal of the rectifier bridge.

[0018] An input pin P of the repeater is connected to an AC input terminal of the rectifier bridge, as well as the anode of the first high-voltage charging diode D5 and the input terminal of the first inverting driver INV1. Another input pin N of the repeater is connected to the other AC input terminal of the rectifier bridge, as well as the anode of the second high-voltage charging diode D6 and the input terminal of the second inverting driver INV2.

[0019] The DC positive output terminal of the rectifier bridge is connected to the input voltage pin of the DCDC DC voltage converter DC, and the output voltage pin of the DCDC DC voltage converter DC is connected to the power supply pins of the first inverting driver INV1 and the second inverting driver INV2 to supply power to the two inverting drivers.

[0020] An output pin PO of the repeater is connected to the output terminal of the first inverting driver INV1 and the cathode of the second high-voltage charging diode D6; another output pin NO of the repeater is connected to the output terminal of the second inverting driver INV2 and the cathode of the first high-voltage charging diode D5.

[0021] The ground terminal of the DCDC DC voltage converter, the ground terminal of the first inverter driver INV1, and the ground terminal of the second inverter driver INV2 are connected to the DC negative output terminal of the rectifier bridge.

[0022] During use, the repeater can be connected in series on the bus.

[0023] Taking an electronic detonator with a 12V low-voltage communication voltage, a 20V charging voltage, and a minimum operating voltage of 10V as an example. When the operating current of the electronic detonator is 50uA and the bus resistance is 50 ohms, when 1000 electronic detonators are used in a network simultaneously, the total operating current is 50mA, and a voltage drop of 2.5V will be generated on the bus. If the repeater is not used, the input voltage of the electronic detonator is 9.5V, which is lower than the minimum operating voltage requirement of 10V.

[0024] In the case of using this patent, the output of the DCDC is the set operating voltage of 10V. The distance between the repeater and the electronic detonator is close, and the line resistance can be ignored. The voltage at the electronic detonator end is approximately the output of the DCDC of the repeater, which is 10V. Calculated with a 90% DCDC conversion efficiency, according to the circuit formula, the bus current can be calculated as 62.7mA, the voltage drop generated by the bus resistance is 3.135V, and the DCDC input voltage is 8.865V, and the repeater can work normally.

[0025] When the electronic detonator is charged with a high voltage of 20V, the voltage of the input pin wire P of the repeater is 20V, the voltage of N is 0V, D6 conducts, the voltage of NO is close to 20V, and the voltage of PO is close to 0V, realizing the high-voltage charging function of the electronic detonator.

[0026] The electronic detonator uses current feedback technology. Since the repeater has no battery and all power is fed back to the bus in real time, the repeater realizes the relay of the electronic detonator feedback.

[0027] It should be understood that the above examples are only illustrative of the present invention and not restrictive of the present invention. Any invention or creation that does not exceed the essential spirit of the present invention falls within the protection scope of the present invention.

Claims

1. The non-powered electronic detonator repeater is characterized in that It includes a DC-DC DC voltage converter, a rectifier bridge composed of four diodes, two high-voltage charging diodes, and two inverting drivers; the output of the DC-DC DC voltage converter is a constant rated voltage of the electronic detonator; specifically: The first diode whose cathode is connected to the anode of the second diode and then connected to the anode of the first high-voltage charging diode and the input terminal of the first inverter driver as an input pin P of the repeater; The second diode The cathode of and the third diode After the cathodes are connected, it is connected to the input voltage pin of the DCDC DC voltage converter The output voltage pin of the DCDC DC voltage converter is connected to the power supply pin of the first inverter driver And the power supply pin of the second inverter driver To supply power to the two inverter drivers; ​ The anode of the third diode is connected to the cathode of the fourth diode and then connected to the anode of the second high-voltage charging diode and the input terminal of the second inverting driver to serve as another input pin N of the repeater; The first inverting driver 's output terminal is connected to the cathode of the second high-voltage charging diode and serves as an output pin PO of the repeater; The output terminal of the second inverting driver is connected to the cathode of the first high-voltage charging diode and serves as another output pin NO of the repeater; The anode of the first diode is connected to the anode of the fourth diode and then connected to the ground terminal of the DCDC DC voltage converter , the ground terminal of the first inverting driver , and the ground terminal of the second inverting driver .

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