Novel coal mine power supply line fault alarm circuit

Abstract

The utility model provides a novel coal mine power supply line fault alarm circuit, which relates to the technical field of coal mine power supply line early warning and comprises a power supply module and a fault detection module. According to the utility model, the current transformer is used for taking electricity from a power grid line, the lithium battery is used for driving the power supply circuit to provide working voltage, the rectifying circuit is used for rectifying and filtering, the shunt capacitor is used for further filtering and rectifying the circuit, and the current detection circuit and the voltage detection circuit are used for realizing a fault detection function. According to the design scheme of the device, the single-chip microcomputer is used as a control core, the lithium battery power circuit is used for supplying power to the single-chip microcomputer and the WIFI module, the power passes through the current detection circuit and the voltage detection circuit after being filtered by the rectification circuit and the capacitor, the detection quantity is provided for the single-chip microcomputer to judge in a voltage mode, and the alarm system is formed by the single-chip microcomputer and the WIFI module. And finally, fault information is sent to a control center through the WIFI module.

Description

TECHNICAL FIELD

[0001] The utility model relates to coal mine power supply line early warning technical field especially relates to a new type coal mine power supply line fault alarm circuit. BACKGROUND

[0002] With the rapid development of social economy and the increasing demand for electricity, the stability, security and reliability of power grid operation are particularly important. In order to ensure the efficient operation of the power system, real-time monitoring and control of the power grid are required to quickly locate and take appropriate measures when a fault occurs. The power grid equipment detection device plays a key role in this process, which detects the line state through the sensor and realizes fault identification combined with the signal processing module, and then transmits the fault information to the control center by using the communication module, so as to ensure the rapid recovery of the power system.

[0003] The existing power equipment detection device is mostly applied in remote areas, and usually needs to use solar panels or ground induction to obtain power. However, the solar panels are limited by weather, season and geographical conditions, and the power supply stability is difficult to guarantee; while the ground induction power acquisition can only be implemented in new or reconstructed lines, and additional lightning protection equipment is needed. Therefore, the current detection device has certain limitations in power supply guarantee and operation environment adaptability, and cannot meet the complex and variable actual application requirements. UTILITY MODEL CONTENT

[0004] In view of the deficiencies of the prior art, the utility model provides a new type coal mine power supply line fault alarm circuit;

[0005] A new type coal mine power supply line fault alarm circuit, comprising: a power module, a fault detection module;

[0006] The power module includes power chip, capacitor C1-C16, resistor R1-R10, Schottky diode D1-D2, inductance L1-L2, +12V voltage input as power input terminal, +12V voltage is filtered by capacitor C1, C2 and C3 in turn, and is connected to the PVDD1 pin and PVDD2 pin of power chip TPS54383 respectively; The BOOT1 pin of the power chip is connected with the inductance L2 through the capacitor C4, one end of the inductance L2 is connected with the Schottky diode D1, the other end of the Schottky diode D1 is grounded, the other end of the inductance L2 is connected with the capacitor C6, C8, C9 and +5V voltage output terminal, the other end of the capacitor C6, C8, C9 is grounded; The SW1 pin of the power chip is connected with the capacitor C4, C12, the capacitor C12 is connected with the resistor R1 and then grounded; The GND pin of the power chip is grounded; The FB1 pin of the power chip is connected with the resistor R7 and then grounded, the resistor R7 is connected with the capacitor C15 and the resistor R10 in parallel; The FB1 pin of the power chip is also connected with the resistor R3, R4 and then connected with +5V voltage output terminal; The BOOT2 pin of the power chip is connected with the inductance L1 through the capacitor C5, one end of the inductance L1 is connected with the Schottky diode D2, the other end of the Schottky diode D2 is grounded, the other end of the inductance L1 is connected with the capacitor C7, C10, C11 and +3.3V voltage output terminal, the other end of the capacitor C7, C10, C11 is grounded; The SW2 pin of the power chip is connected with the capacitor C5, C13, the capacitor C13 is connected with the resistor R2 and then grounded; The BP pin of the power chip is connected with the ILIM2 pin of the power chip, then connected with C14 and grounded; The FB2 pin of the power chip is connected with the resistor R8 and then grounded, the resistor R8 is connected with the capacitor C16 and the resistor R9 in parallel; The FB2 pin of the power chip is also connected with the resistor R5, R6 and then connected with +3.3V voltage output terminal;

[0007] The fault detection circuit comprises a current transformer T1, a full-bridge rectifier circuit, a capacitor C17, resistors R11-R123, a single-chip microcomputer and a WIFI module; the current transformer T1 is connected to the power grid line to take power and is connected to the full-bridge rectifier circuit; a positive output end of the full-bridge rectifier circuit is connected to the resistor R11, a negative output end of the full-bridge rectifier circuit is connected to the resistor R13 and then grounded, the positive output end of the full-bridge rectifier circuit and the negative output end of the full-bridge rectifier circuit are connected in parallel to the capacitor C17, the other end of the resistor R11 is connected to the resistor R12 and then grounded; a VCC pin of the single-chip microcomputer STM32F103C8T6 is connected to a +5V voltage input, a PA2 pin of the single-chip microcomputer is connected to the negative output end, a PA3 pin of the single-chip microcomputer is connected to the resistor R11 and the resistor R12, a Tx pin of the single-chip microcomputer is connected to a Rx pin of the WIFI module, a Rx pin of the single-chip microcomputer is connected to a Tx pin of the WIFI module, a GND pin of the single-chip microcomputer is grounded, a VCC pin of the WIFI module ESP-01S is connected to a +3.3V voltage input, and a GND pin of the WIFI module is grounded.

[0008] The technical scheme has the beneficial effects that:

[0009] The novel coal mine power supply line fault alarm circuit has the feature that a filter circuit is designed, a filter capacitor is added in the fault detection circuit, high-frequency interference signals in the coal mine power supply line can be effectively filtered out, the influence of the noise is reduced, the quality of the detection signal is improved, the detection system is more reliable, the influence of voltage fluctuation in the coal mine line on the power supply fault detection circuit is reduced, and the stability and accuracy of the circuit are improved.

[0010] Compared with solar power supply and ground induction power supply, the current transformer is cheaper than the voltage transformer, can be more conveniently installed on the power grid line, and has low cost, long service life, green environmental protection, high reliability of the backup power supply, ensures the smoothness of the fault detection work, can filter out more interference signals through the parallel capacitor, and provides more accurate measurement results, the design uses lithium batteries to match the power supply circuit to not only ensure the stability of the power supply, but also reduce the cost, the detection circuit part has simple structure and is not prone to faults, the filter capacitor can be used to more accurately obtain voltage data and judge, the whole device has low cost, is easy to install, and can adapt to harsh environments. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 The circuit principle diagram of the novel coal mine power supply line fault alarm circuit. DETAILED DESCRIPTION

[0012] The specific embodiments of the present application will be further described in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present application, but are not used to limit the scope of the present application.

[0013] A novel coal mine power supply line fault alarm circuit, such as Figure 1As shown, the power module in this embodiment includes a lithium battery and a power circuit; the lithium battery serves as the main input power supply, provides power for the tps chip, and then converts 5V and 3.3V output to provide power for the peripheral circuit; the capacitors C1, C2, and C3 in the figure are located at the 12V power input end, and are used for decoupling and filtering the input voltage, large-capacity capacitors can filter low-frequency noise, and small-capacity capacitors are used for filtering high-frequency noise, to ensure the stability of the 12V power input; the tps chip of the power circuit is a dual-channel synchronous step-down converter, each channel has an independent step-down loop. It is the core device of the circuit, responsible for converting the input 12V to two different output voltages (5V and 3.3V); PVDD1 and PVDD2: These two pins supply power to the internal power MOSFET of the chip, and they are directly connected to the 12V input power supply to provide input voltage for the two-channel step-down converter; BOOT1 and BOOT2: These pins are used to drive the high-side MOSFET, and the external boost capacitors C4 and C5 are connected, which provides sufficient voltage for the gate of the high-side MOSFET to ensure its normal switching; SW1 and SW2: These two pins are connected to the inductors L1 and L2 of each channel respectively. The inductor is used to store energy and smooth the output voltage. When the MOSFET is turned on, the inductor stores energy; when the MOSFET is turned off, the inductor releases energy and provides continuous current to the load through Schottky diodes D1 and D2. They are the switching nodes of the step-down converter, and the switching action is combined with the inductor to store energy and regulate the output voltage. The main function of the Schottky diode is to provide a return path for the energy in the inductor when the switch is off, and to prevent the reverse voltage generated by the inductor from damaging the circuit. MBRS330T3 has a low forward voltage drop, which can improve the efficiency of the circuit. FB1 and FB2: These are feedback pins that control the output voltage of the first 5V and second 3.3V channels respectively. By connecting an external resistance divider network, the chip senses the output voltage through these pins and adjusts it to maintain the target voltage value; R3, R4, R7, R10 divide the 5V output voltage and feed it back to the FB1 pin. The chip senses the feedback voltage through the FB1 pin and compares it with the internal reference voltage to adjust the output voltage to maintain it at 5V. R5, R6, R8, R9 work in the same way, and C15 and C16 are used to adjust the response characteristics of the error amplifier to improve the dynamic response and stability of the system; C6, C8, C9, C12 are used to smooth the output voltage and reduce ripple. Larger capacitors are used to filter low-frequency noise, and smaller capacitors are used to filter high-frequency noise; the ILIM2 pin is used to set the current limit value of each channel.By connecting an external resistor, the chip can detect the current and limit the current flowing beyond the set value to prevent overcurrent damage to the circuit. The BP pin is usually the output pin of the low dropout regulator inside the power supply chip, which provides working voltage for the internal circuit. The main function of C14 is to filter and stabilize the voltage of the BP pin to prevent unstable or fluctuating output and help ensure the stable operation of the ILIM2 pin current limiting function, while filtering out possible noise and current spikes.

[0014] The fault detection module is composed of a current transformer, a rectifier circuit, a capacitor C17, a current detection circuit, a voltage detection circuit, a single-chip microcomputer, and a WIFI module. The process of fault detection is as follows: when a short-circuit fault occurs in the power grid line, a large current is generated in the power grid line for a short time (tens of ms), a large current flows through the primary side of the current transformer, the current coupled to the secondary side of the current transformer passes through the rectifier circuit, and after being filtered by the capacitor, the single-chip microcomputer and the WIFI module start to work normally under the power supply of the power module, the current detection circuit detects the current of the secondary side of the current transformer in real time and converts the detected current signal into an input voltage of the single-chip microcomputer and outputs it to the single-chip microcomputer, when the input voltage of the single-chip microcomputer output by the current detection circuit reaches the interrupt trigger voltage in the single-chip microcomputer, the single-chip microcomputer will process the interrupt, send the fault signal to the control center through the WIFI module, the voltage detection circuit detects the input voltage in real time and outputs the detected signal to the single-chip microcomputer, the single-chip microcomputer compares the voltage detection value received by it with the standard voltage preset in the single-chip microcomputer, when the voltage is too large to reach the trigger voltage, the single-chip microcomputer will process the interrupt, and send the fault signal to the control center through the WIFI module. The setting of the two circuits can enhance the reliability of fault detection, and when one of the circuits fails to work, the other can also work normally.

[0015] The above description is only the preferred embodiment of the present disclosure and the explanation of the applied technical principles. Those skilled in the art should understand that the utility model range involved in the embodiments of the present disclosure is not limited to the technical solutions formed by the specific combination of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above utility model concept. For example, the above features are replaced with the technical features disclosed in the embodiments of the present disclosure (but not limited to) having similar functions to form technical solutions.

Claims

1. A new type of coal mine power supply line fault alarm circuit, characterized in that, The utility model relates to a kind of power supply module and fault detection module. The power supply module includes power supply chip, capacitor C1-C16, resistance R1-R10, Schottky diode D1-D2, inductance L1-L2, +12V voltage input is power input terminal, +12V voltage is filtered by capacitor C1, C2 and C3 in turn, and is connected to the PVDD1 pin and PVDD2 pin of power supply chip respectively;The fault detection circuit includes current transformer T1, full-bridge rectifier circuit, capacitor C17, resistance R11-R13, single-chip microcomputer and WIFI module;The current transformer T1 is powered at power grid line, and is connected with full-bridge rectifier circuit;The positive output end of full-bridge rectifier circuit is connected with resistance R11, the negative output end of full-bridge rectifier circuit is connected with resistance R13 and then grounded, and the positive output end of full-bridge rectifier circuit is connected with capacitor C17 in parallel with the negative output end of full-bridge rectifier circuit, and the other end of resistance R11 is connected with R12 and then grounded. The BOOT1 pin of the power supply chip is connected with inductance L2 by capacitor C4, one end of the inductance L2 is connected with Schottky diode D1, the other end of the Schottky diode D1 is grounded, the other end of the inductance L2 is connected with capacitor C6, C8, C9 and +5V voltage output terminal, the other end of the capacitor C6, C8, C9 is grounded;The SW1 pin of the power supply chip is connected with capacitor C4, C12, the capacitor C12 is connected with resistance R1 and then grounded;The GND pin of the power supply chip is grounded;The FB1 pin of the power supply chip is connected with resistance R7 and then grounded, and the resistance R7 is connected with capacitor C15 and resistance R10 in parallel;The FB1 pin of the power supply chip is connected with resistance R3, R4 and then connected with +5V voltage output terminal;The BOOT2 pin of the power supply chip is connected with inductance L1 by capacitor C5, one end of the inductance L1 is connected with Schottky diode D2, the other end of the Schottky diode D2 is grounded, the other end of the inductance L1 is connected with capacitor C7, C10, C11 and +3.3V voltage output terminal, the other end of the capacitor C7, C10, C11 is grounded;The SW2 pin of the power supply chip is connected with capacitor C5, C13, the capacitor C13 is connected with resistance R2 and then grounded;The BP pin of the power supply chip is connected with the ILIM2 pin of the power supply chip, and then connected with C14 and grounded;The FB2 pin of the power supply chip is connected with resistance R8 and then grounded, and the resistance R8 is connected with capacitor C16 and resistance R9 in parallel;The FB2 pin of the power supply chip is connected with resistance R5, R6 and then connected with +3.3V voltage output terminal.

2. A new type of coal mine power supply line fault alarm circuit according to claim 1, characterized in that, The VCC pin of the single-chip microcomputer is connected with +5V voltage input, the PA2 pin of the single-chip microcomputer is connected with negative output terminal, the PA3 pin of the single-chip microcomputer is connected with the connection place of resistance R11 and resistance R12, the Tx pin of the single-chip microcomputer is connected with the Rx pin of the WIFI module, the Rx pin of the single-chip microcomputer is connected with the Tx pin of the WIFI module, and the GND pin of the single-chip microcomputer is grounded.

3. The new coal mine power supply line fault alarm circuit according to claim 1, characterized in that, ​ 4. The new coal mine power supply line fault alarm circuit according to claim 1, characterized in that, The VCC pin of the WIFI module is connected with +3.3V voltage input, and the GND pin of the WIFI module is grounded.

5. The new coal mine power supply line fault alarm circuit according to claim 1, characterized in that, The power supply chip adopts TPS54383.

6. The new coal mine power supply line fault alarm circuit according to claim 1, characterized in that, The single-chip microcomputer adopts STM32F103C8T6.

7. The new coal mine power supply line fault alarm circuit according to claim 1, characterized in that, The WIFI module adopts ESP-01S.

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