Mining digital circuit breaker

Abstract

The utility model discloses a mining digital circuit breaker, which is characterized in that the output end of a switching power supply is connected with a main MCU (Microprogrammed Control Unit) and a double-contact relay J1 to supply power to the main MCU and the double-contact relay J1; the substation control signal input unit is connected with the double-contact relay J1 to control connection or disconnection of contacts of the double-contact relay J1, one auxiliary contact of the double-contact relay J1 controls connection and disconnection of a mining power supply, and the other auxiliary contact of the double-contact relay J1 acts synchronously; the 485 communication control unit, the double-contact relay J1, the high-voltage feed return detection unit, the contact state detection unit and the address switch are respectively connected with the main MCU; the address switch is used for setting a communication address of the circuit breaker, the main MCU is in 485 communication with a monitoring substation, the high-voltage feed return detection unit collects feed voltage of a load side of the circuit breaker and inputs the feed voltage into the main MCU, and the contact state detection unit collects synchronous contact signals of the double-contact relay J1 and inputs the synchronous contact signals into the main MCU. According to the utility model, the control of the circuit breaker and the return of the feed state are completed at one time in the existing signal line.

Description

Technical Field

[0001] The utility model relates to a digital type circuit breaker for mining, belonging to the technical field of mining equipment. Background Art

[0002] Most of the existing circuit breakers used underground use one-way control and AC power supply, that is, the coal mine monitoring substation is responsible for sending the control command, and cannot confirm whether the circuit breaker has received the control signal, and cannot realize the autonomous collection of the power supply line feeding status and the circuit breaker contact status through the return signal. The monitoring substation needs to collect the feeding status and contact status through another switch input port of the monitoring substation for signal collection, which has certain safety hazards. With the widespread application of digital communication circuits, a digital circuit breaker for mining is developed, which enables the control and feeding status of the circuit breaker to be returned on the existing signal line of the digital circuit breaker to complete the control and signal collection functions at one time, which can simplify the line and reduce safety risks. Utility Model Content

[0003] The utility model aims to provide a digital breaker for mining, in which the control of the breaker and the feedback of the power feeding state are completed at one time in the existing signal line of the digital breaker, thereby simplifying the line and reducing the safety risk.

[0004] The purpose of the utility model is achieved through the following technical solutions:

[0005] A digital power breaker for mining, comprising an intrinsically safe power supply, a 5V switching power supply, a 485 communication control unit, a main MCU, a double-contact relay J1, a high-voltage feed back detection unit, a contact state detection unit, an address switch, and a substation control signal input unit; the intrinsically safe power supply is connected to the input end of the switching power supply, the intrinsically safe power supply provides 9-24V intrinsically safe power to the switching power supply, the switching power supply outputs a DC5V power supply, the switching power supply output end is connected to the main MCU and the double-contact relay J1, and supplies power to the main MCU and the double-contact relay J1; the substation control signal input unit is connected to the double-contact relay J1, and controls the contact of the double-contact relay J1 to be connected or disconnected according to the substation control signal, and a sub-contact of the double-contact relay J1 is connected to the substation control signal. The contact controls the on and off of the mining power supply, and the other pair of contacts of the double-contact relay J1 acts synchronously as a synchronous contact; the 485 communication control unit, the double-contact relay J1, the high-voltage feed feedback detection unit, the contact state detection unit, and the address switch are respectively connected to the main MCU; the address switch adopts a four-bit dial switch to set the communication address of the breaker, the main MCU collects the communication address of the address switch, and the main MCU communicates with the monitoring substation through the 485 communication control unit. The high-voltage feed feedback detection unit collects the feed voltage on the load side of the breaker and inputs the feed state signal into the main MCU, and the contact state detection unit collects the synchronous contact signal of the double-contact relay J1 and inputs it into the main MCU.

[0006] The purpose of the utility model can also be further achieved through the following technical measures:

[0007] The above-mentioned mining digital breaker, wherein the high-voltage power feed back detection unit includes a current limiting resistor R21, a current limiting resistor R19, a current limiting resistor R22, a current limiting resistor R17, an optocoupler GD1, a diode D8, a transistor BG4, a voltage regulator W19, a resistor R32, a resistor R33, and a capacitor C27. One end GY1 of the power feed voltage on the load side of the breaker is connected in series with the current limiting resistor R21 and the current limiting resistor R19, and then connected to the cathode of the diode D8. The other end GY2 of the power feed voltage on the load side of the breaker is connected in series with the current limiting resistor R22 and the current limiting resistor R17, and then connected to the anode of the diode D8. The cathode of the light-emitting diode of the optocoupler GD1 is connected to the anode of the diode D8. The anode of the light-emitting diode of the optocoupler GD1 is connected to the cathode of the diode D8, the collector of the phototransistor of the optocoupler GD1 is connected to the power supply V+, the emitter of the phototransistor of the optocoupler GD1 is connected to the cathode of the voltage-regulating tube W19, the anode of the voltage-regulating tube W19 is connected to the power supply V-, one end of the capacitor C27 is connected to the power supply V-, and the other end is connected to the base of the transistor BG4, one end of the resistor R33 is connected to the power supply V-, and the other end is connected to the base of the transistor BG4, one end of the resistor R32 is connected to the cathode of the voltage-regulating tube W19, and the other end of the resistor R32 is connected to the base of the transistor BG4, the emitter of the transistor BG4 is connected to the power supply V-, and the collector of the transistor BG4 outputs a high-voltage feed signal to the main MCU.

[0008] The contact state detection unit of the aforementioned mining digital breaker includes a main MCU and a double-contact relay J1. One end of the synchronization contact of the double-contact relay J1 is connected to the power supply V-, and the other end of the synchronization contact is connected to the main MCU.

[0009] The aforementioned mining digital circuit breaker, wherein the main MCU is the STC15W408AD single chip microcomputer.

[0010] Compared with the prior art, the utility model has the following beneficial effects: the control of the circuit breaker and the feedback of the power supply status are completed at one time in the existing signal line of the digital circuit breaker, which simplifies the line and reduces the safety risk. The linear voltage-stabilized power supply of the prior art is changed into a switching voltage-stabilized power supply, which realizes a significant reduction in the power consumption of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a system structure diagram of the utility model;

[0012] Figure 2 This is a circuit diagram of a high voltage feed back detection unit of the utility model;

[0013] Figure 3 It is a circuit diagram of a specific embodiment. DETAILED DESCRIPTION

[0014] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments.

[0015] like Figure 1 As shown, a digital type power breaker for mining of the utility model includes an intrinsically safe power supply, a 5V switching power supply, a 485 communication control unit, a main MCU, a double-contact relay J1, (one set of contacts is used for power-off control, and the other set of contacts is used for synchronous contact state detection), a high-voltage feed back detection unit, (detects the feed state of the load side of the controlled switch, and feeds back the signal of the feed state to the mining monitoring substation through the MCU), a contact state detection unit, an address switch, and a substation control signal input unit. The intrinsically safe power supply is connected to the input end of the switching power supply, and the intrinsically safe power supply provides 9-24V intrinsically safe power to the switching power supply. The switching power supply outputs DC5V, and the output end of the switching power supply is connected to the main MCU and the double-contact relay J1 to supply power to the main MCU and the double-contact relay J1; the substation control signal input unit is connected to the double-contact relay J1, and the substation control signal input unit controls the connection or disconnection of the double-contact relay J1. The contacts of the double-contact relay J1 control the on and off of the mining power supply, and the other pair of contacts of the double-contact relay J1 acts synchronously as a synchronous contact. The 485 communication control unit, double-contact relay J1, high-voltage feed back detection unit, contact status detection unit, and address switch are respectively connected to the main MCU. The address switch adopts a four-bit dip switch for setting the communication address of the circuit breaker. The main MCU collects the address switch address to confirm whether to respond to the call command of the mining monitoring substation.

[0016] like Figure 2As shown, the high-voltage feeder feedback detection unit includes a current limiting resistor R21, a current limiting resistor R19, a current limiting resistor R22, a current limiting resistor R17, an optocoupler GD1, a diode D8, a transistor BG4, a voltage regulator W19, a resistor R32, a resistor R33, and a capacitor C27. In the figure, JJX1 and JX2 are connection terminals. One end GY1 of the feeder voltage on the load side of the breaker is connected in series with the current limiting resistor R21 and the current limiting resistor R19, and then connected to the cathode of the diode D8. The other end GY2 of the feeder voltage on the load side of the breaker is connected in series with the current limiting resistor R22 and the current limiting resistor R17, and then connected to the anode of the diode D8. The cathode of the light-emitting diode of the optocoupler GD1 is connected to the anode of the diode D8, and the anode of the light-emitting diode of the optocoupler GD1 is connected to the cathode of the diode D8. The collector of the photosensitive transistor of the optocoupler GD1 is connected to the power supply V+. The optocoupler G The emitter of the phototransistor D1 is connected to the cathode of the voltage regulator W19, the anode of the voltage regulator W19 is connected to the power supply V-, one end of the capacitor C27 is connected to the power supply V-, and the other end is connected to the base of the transistor BG4, one end of the resistor R33 is connected to the power supply V-, and the other end is connected to the base of the transistor BG4, one end of the resistor R32 is connected to the cathode of the voltage regulator W19, and the other end of the resistor R32 is connected to the base of the transistor BG4, the emitter of the transistor BG4 is connected to the power supply V-, and the collector of the transistor BG4 outputs a high-voltage feeding signal to the main MCU. The contact state detection unit includes the main MCU and the double-contact relay J1, one end of the synchronization contact of the double-contact relay J1 is connected to the power supply V-, and the other end of the synchronization contact is connected to the main MCU. The main MCU communicates with the monitoring substation through the 485 communication control unit, and uploads the feeding state and the contact state to the monitoring substation.

[0017] like Figure 3 The circuit diagram of a specific embodiment is shown, and the specific working principle is as follows:

[0018] The digital breaker adopts the existing DC9-24V intrinsically safe power supply, and the digital communication control port is designed to isolate the 485 circuit. The breaker uses the STC15W408AD microcontroller as the main MCU of the device. The microcontroller has 28 pins, and the number is IC1 in the figure; the relay components used in the digital breaker are double contacts, one group is used for power-off control, and the other group is used for synchronous contact state detection, and the contact state signal is fed back to the mining monitoring substation through the MCU; the breaker also provides a high-voltage feed back detection unit to detect the feed state of the load side of the controlled switch, and the feed state signal is fed back to the mining monitoring substation through the MCU. The positive and negative poles of the power supply are introduced through the terminal K2 and the terminal K1 respectively, and RS485A and RS485B are output to the monitoring substation through the H2 and H1 terminals respectively; the remote line control of the monitoring substation is input through the K3 terminal; the passive normally open and normally closed contacts of the double-contact relay are led out from the terminals P1, P2 and P3, among which P2 is the common terminal, P1 and P2 are normally open, and P3 and P2 are normally closed.

[0019] The DLY1 surge protection component is designed between K1 and K2, and enters the switching power supply V1 after passing through diodes D7 and D3. The switching power supply V1 adopts the K7805 module, and after being protected by GK1, W1, GK2, and W2, it outputs a constant DC 5V power supply, which supplies power to the main chip STC15W408AD, the RS485 drive part, and the relay J1 respectively. K3 introduces the remote line control input of the substation, and after passing through the DLY2 surge protection and GD2 optical coupler isolation, it directly drives the relay J1 to act or not, high level action, and low level recovery. GY1 and GY2 are introduced for high-voltage feed detection wiring. GY1 and GY2 are introduced into the optocoupler through current limiting resistors R21 and R19, R22 and R17 respectively. After the optocoupler GD1 is isolated, it controls the transistor BG4 to realize the level conversion of the P3.6 pin (21 pin) of MCU (IC1). If there is power, the GD1 optocoupler is turned on, the BG4 transistor is turned on, and the 21 pin of MCU (IC1) is low level. If there is no power, the GD1 optocoupler is not turned on, the BG4 transistor is not turned on, and the 21 pin of IC1 is high level, so that the main MCU detects the feeding state of the controlled switch. In the figure, the other pair of contacts (synchronous contacts) of the double-contact relay J1 is led to the 20 pin of IC1. IC1 can detect the level conversion of the 20 pin to detect whether the relay J1 is activated or not, thereby realizing the detection of the relay contact state.

[0020] For debugging purposes, this device can be equipped with a controlled switch, and the controlled working mode of this device can be confirmed through the controlled switch BM1. The BM1 controlled switch adopts an eight-bit dip switch. The first six dip switches correspond to the control ports 1-6 of the mine monitoring substation respectively. If one of the BM1 dip switches of this device is in the ON position, the monitoring substation is controlled, and if it is in the OFF position, it is not controlled; the seventh dip switch is used as a switch to determine whether the power-off control of the circuit breaker needs to be enabled when the 485 communication is interrupted (communication interruption is an abnormal state, and the power supply may need to be cut off). The ON position is enabled, and the OFF position is not enabled; the eighth position is that when the dip switch is in the ON position, the circuit breaker performs actions according to negative logic, and when it is in the OFF position, the circuit breaker performs actions according to positive logic.

[0021] IC1 confirms the address number of the device through the address switch BM2. The BM2 address switch uses a four-bit dip switch, which is used to set the communication address of the circuit breaker. The main MCU collects the address switch address to confirm whether to respond to the call command of the mining monitoring substation.

[0022] The DC-DC isolated power supply module of the RS485 driver part is numbered IC10 in the figure; the 485 driver chip uses the ADM2483 component, numbered IC3 in the figure. The RX and TX of this device are connected to the serial port of the main MCU to realize TTL communication. IC3 is responsible for converting the TTL signal into the RS485 communication method. IC3 has realized electrical isolation between TTL and RS485 driver A / B. Surge protection components W21, W22, and W23 are designed between A and B of the RS485 driver A / B output part.

[0023] In addition to the above-mentioned embodiments, the present invention may also have other implementation modes. Any technical solutions formed by equivalent replacement or equivalent transformation shall fall within the protection scope required by the present invention.

Claims

1. A digital breaker for mining, characterized in that , including an intrinsically safe power supply, a 5V switching power supply, a 485 communication control unit, a main MCU, a double-contact relay J1, a high-voltage feed back detection unit, a contact state detection unit, an address switch, and a substation control signal input unit; the intrinsically safe power supply is connected to the switching power supply input end, the intrinsically safe power supply provides 9-24V intrinsically safe power to the switching power supply, the switching power supply outputs DC5V power, the switching power supply output end is connected to the main MCU and the double-contact relay J1, and supplies power to the main MCU and the double-contact relay J1; the substation control signal input unit is connected to the double-contact relay J1, and controls the double-contact relay J1 contacts to be connected or disconnected according to the substation control signal, and a pair of contacts of the double-contact relay J1 controls the mine With the on and off of the power supply, the other pair of contacts of the double-contact relay J1 acts synchronously as a synchronous contact; the 485 communication control unit, the double-contact relay J1, the high-voltage feed feedback detection unit, the contact state detection unit, and the address switch are respectively connected to the main MCU; the address switch adopts a four-bit dial switch for setting the communication address of the breaker, the main MCU collects the communication address of the address switch, the main MCU communicates with the monitoring substation through the 485 communication control unit, the high-voltage feed feedback detection unit collects the feed voltage on the load side of the breaker and inputs the feed state signal into the main MCU, and the contact state detection unit collects the synchronous contact signal of the double-contact relay J1 and inputs it into the main MCU.

2. The mining digital circuit breaker according to claim 1, characterized in that: The high-voltage power feeding feedback detection unit includes a current limiting resistor R21, a current limiting resistor R19, a current limiting resistor R22, a current limiting resistor R17, an optocoupler GD1, a diode D8, a transistor BG4, a voltage regulator W19, a resistor R32, a resistor R33, and a capacitor C27. One end GY1 of the power feeding voltage on the load side of the breaker is connected in series with the current limiting resistor R21 and the current limiting resistor R19, and then connected to the cathode of the diode D8. The other end GY2 of the power feeding voltage on the load side of the breaker is connected in series with the current limiting resistor R22 and the current limiting resistor R17, and then connected to the anode of the diode D8. The cathode of the light-emitting diode of the optocoupler GD1 is connected to the anode of the diode D8. The anode of the light-emitting diode is connected to the cathode of the diode D8, the collector of the phototransistor of the optocoupler GD1 is connected to the power supply V+, the emitter of the phototransistor of the optocoupler GD1 is connected to the cathode of the voltage-regulating tube W19, the anode of the voltage-regulating tube W19 is connected to the power supply V-, one end of the capacitor C27 is connected to the power supply V-, and the other end is connected to the base of the transistor BG4, one end of the resistor R33 is connected to the power supply V-, and the other end is connected to the base of the transistor BG4, one end of the resistor R32 is connected to the cathode of the voltage-regulating tube W19, and the other end of the resistor R32 is connected to the base of the transistor BG4, the emitter of the transistor BG4 is connected to the power supply V-, and the collector of the transistor BG4 outputs a high-voltage feed signal to the main MCU.

3. The mining digital circuit breaker according to claim 1, characterized in that: The contact state detection unit comprises a main MCU and a double-contact relay J1. One end of a synchronous contact of the double-contact relay J1 is connected to a power source V-, and the other end of the synchronous contact is connected to the main MCU.

4. The mining digital circuit breaker according to claim 1, characterized in that: The main MCU is STC15W408AD microcontroller.

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