Improved mining intrinsically safe power supply

Abstract

The utility model discloses an improved mining intrinsically safe power supply, which relates to the technical field of mining power supplies, and converts 220V alternating current into direct current through a bridge rectifier filter circuit after passing through an over-current protector, an anti-surge protector I and an EMC (Electro Magnetic Compatibility) anti-interference circuit in sequence. The high-frequency switching power supply module converts direct current into high-frequency alternating current, and voltage conversion is achieved through a high-frequency transformer. The discrete intrinsically safe circuit performs multi-stage voltage and current detection and protection, dynamically adjusts a protection threshold, and ensures that accurate protection is provided during overvoltage, undervoltage, overcurrent or short circuit faults. And finally, the surge protection device II suppresses the surge voltage of the output side, and provides 12V, 18V or 24V direct current voltage through the intrinsic safety output interface. According to the mining intrinsically safe power supply, through modular design and dynamic threshold adjustment, the problem of unified protection of multiple voltage levels is solved, and the safety, adaptability and production efficiency of a system are remarkably improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of mine power supply, and specifically relates to an improved mine intrinsic safety type power supply. BACKGROUND

[0002] With the rapid development of mine mechanization and automation, the demand for power supply of mining equipment is also increasing. The traditional mine power supply often adopts the design of explosion-proof type, which prevents the occurrence of explosion through physical isolation. Although the traditional design is safe, it is bulky, heavy, and difficult to be flexibly applied in the complex and changeable mine environment. The intrinsic safety type power supply gradually becomes an important part of the mine power supply system due to its small size, light weight and strong adaptability. The mine intrinsic safety type power supply is a power supply device specially designed for mine environment, and its core purpose is to provide safe and reliable power supply in high-risk environment. The mine environment has particularity, usually accompanied by high dust, humidity, high temperature and the existence of flammable and explosive gas, which puts high requirements on the safety and reliability of power supply equipment. The design concept of intrinsic safety type power supply is to prevent the generation of electric spark by limiting the energy (such as voltage and current) in the circuit, so as to avoid causing explosion or fire accident.

[0003] Although the mine intrinsic safety type power supply has made significant progress in technology, there are still some problems to be solved. The early design of mine power supply often focuses on mechanical strength and basic circuit protection, but has limited ability to deal with transient voltage fluctuation, surge current impact, electromagnetic interference (EMI / EMC) and other aspects in complex working conditions, which not only affects the stability and reliability of the power supply, but also is difficult to meet the demand of modern mining equipment for efficient and intelligent power supply. The existing mine power supply is often designed for specific working conditions, lacks flexibility and universality, and different regions of the same mine may need power supply output of different voltage grades, while the existing equipment usually needs to be replaced or reconfigured to adapt to these changes, increasing the maintenance cost and time. Therefore, we provide an improved mine intrinsic safety type power supply to solve the above problems. UTILITY MODEL CONTENTS

[0004] In order to overcome the above-mentioned defects of the prior art, the utility model provides an improved mine intrinsic safety type power supply.

[0005] In order to achieve the above-mentioned purpose, the utility model provides the following technical scheme: an improved mine intrinsic safety type power supply, comprising:

[0006] Bridge rectifier filter circuit (5);

[0007] High-frequency switching power supply module (6) is connected in parallel with bridge rectifier filter circuit (5), which is used for converting the direct current rectified by bridge rectifier filter circuit (5) into high-frequency alternating current;

[0008] A common mode filter (7) is connected in series with the high-frequency switching power module (6);

[0009] A discrete intrinsic safety circuit protection module (8) is connected in series with the common mode filter (7) and the high-frequency switching power module (6) through a pin interface (81);

[0010] A surge protector two (9) is connected in series with the discrete intrinsic safety circuit protection module (8);

[0011] An intrinsic safety output interface (10) is connected in series with the surge protector two (9) and is used for outputting different levels of DC voltage.

[0012] Further, an improved intrinsic safety power supply for mine use further comprises:

[0013] An AC input interface (1) is used for connecting an AC power supply;

[0014] An overcurrent protector (2) is connected in series with the AC input interface (1);

[0015] A surge protector one (3) is connected in series with the overcurrent protector (2);

[0016] An EMC anti-interference circuit (4) is connected in series with the surge protector one (3) and the bridge rectifier filter circuit (5).

[0017] Further, the discrete intrinsic safety circuit protection module (8) comprises:

[0018] A pin interface (81) is used for transmitting signal data between the discrete intrinsic safety circuit protection module (8) and the common mode filter (7);

[0019] A voltage sampling unit (82) is connected in parallel with an output end of the common mode filter (7) and is used for detecting the voltage of the output end in real time;

[0020] A current sampling unit (83) is connected in parallel with the output end of the common mode filter (7) and obtains a load current signal by connecting a high-precision current detection resistor in series;

[0021] A threshold adjustable circuit (84) is configured to dynamically adjust the overvoltage, undervoltage and overcurrent protection thresholds through a programmable resistor;

[0022] A control chip (85) is connected in parallel with the threshold adjustable circuit (84) and controls the on-off state of a MOSFET switch in a synchronous rectification chip (62) based on the output signals of the voltage sampling unit (82) and the current sampling unit (83).

[0023] Further, the discrete intrinsic safety circuit protection module (8) is adapted to the high-frequency switching power module (6) of different voltage levels through the pin interface (81).

[0024] Further, the pin interface (81) of the discrete intrinsic safety circuit protection module (8) comprises:

[0025] a power input pin (811) connected in parallel with the output end of the common-mode filter (7);

[0026] a voltage feedback pin (812) connected in optical coupling isolation with the optocoupled voltage reference chip (63) of the high-frequency switching power supply module (6);

[0027] a control signal pin (813) connected in series with the high-frequency switching power supply module (6) for transmitting the switching control signal of the control chip (85) to the high-frequency switching power supply module (6).

[0028] Further, the high-frequency switching power supply module (6) comprises:

[0029] a multi-mode PWM switching power supply chip (61) connected in series with the bridge rectifier filter circuit (5) for switching the working mode according to the load demand;

[0030] a synchronous rectification chip (62) connected in series with the high-frequency transformer (65);

[0031] an optocoupled voltage reference chip (63) connected in series with the multi-mode PWM switching power supply chip (61) for transmitting the feedback signal of the output voltage;

[0032] a π-type filter circuit (64) connected in parallel with the multi-mode PWM switching power supply chip (61) and the optocoupled voltage reference chip (63) for suppressing high-frequency noise;

[0033] a high-frequency transformer (65) connected in series with the bridge rectifier filter circuit (5) for realizing closed-loop control through optical coupling isolation.

[0034] Further, the drive signal of the synchronous rectification chip (62) is provided by the secondary winding of the high-frequency transformer (65), and its gate is connected in series with an RC absorption circuit.

[0035] Further, the discrete intrinsic safety circuit protection module (8) further comprises:

[0036] a double isolation circuit connected in series with the common-mode filter (7) and the surge protector two (9) for realizing high-low voltage isolation through optical coupling and magnetic isolation elements;

[0037] a dynamic response unit connected in series with the intrinsic safety output interface (10) for cutting off the output and triggering the self-recovery mechanism within a preset time when a short-circuit fault is detected.

[0038] Further, the shell of the discrete intrinsic safety circuit protection module (8) is made of flame-retardant material, and the surface is provided with heat dissipation fins (87) and an EMI shielding layer (88).

[0039] The improved mine intrinsic safety power supply has the following technical effects and advantages:

[0040] (1) The improved mine intrinsic safety power supply has the following technical effects and advantages:

[0041] (2) The improved mine intrinsic safety power supply has the following technical effects and advantages:

[0042] (3) The improved mine intrinsic safety power supply has the following technical effects and advantages: BRIEF DESCRIPTION OF DRAWINGS

[0043] Figure 1 The improved mine intrinsic safety power supply has the following technical effects and advantages:

[0044] Figure 2This is a schematic diagram of the structure of the high-frequency switching power supply module of this utility model;

[0045] Figure 3 This is the circuit schematic diagram of the high-frequency switching power supply module of this utility model;

[0046] Figure 4 This is a circuit diagram of the discrete intrinsically safe circuit protection module of this utility model.

[0047] In the diagram: 1. AC input interface; 2. Overcurrent protector; 3. Surge protector one; 4. EMC anti-interference circuit; 5. Bridge rectifier filter circuit; 6. High-frequency switching power supply module; 61. Multi-mode PWM switching power supply chip; 62. Synchronous rectifier chip; 63. Optocoupler voltage reference chip; 64. π-type filter circuit; 65. High-frequency transformer; 7. Common-mode filter; 8. Discrete intrinsically safe circuit protection module; 9. Surge protector two; 10. Intrinsically safe output interface. Detailed Implementation

[0048] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0049] Example 1

[0050] Reference Figure 1 This embodiment provides a technical solution: an improved intrinsically safe power supply for mining, comprising:

[0051] AC input interface 1 is used to connect to a 220V AC power supply.

[0052] Overcurrent protector 2 is connected in series with AC input interface 1 to prevent overcurrent on the input side.

[0053] Surge protector 3, connected in series with overcurrent protector 2, is used to suppress surge voltage on the input side.

[0054] EMC anti-interference circuit 4, connected to surge protector 3, is used to suppress electromagnetic interference.

[0055] The bridge rectifier filter circuit 5 is connected to the EMC anti-interference circuit 4 and is used to rectify AC power into DC power and filter it.

[0056] The high-frequency switching power supply module 6 is connected in parallel with the bridge rectifier filter circuit 5 and is used to convert the DC power rectified by the bridge rectifier filter circuit 5 into high-frequency AC power.

[0057] The common-mode filter 7 is connected in series with the high-frequency switching power module 6, and is used to suppress common-mode noise.

[0058] The discrete intrinsic safety circuit protection module 8 is connected in plug-in manner through the pin interface 81 to the common-mode filter 7 and the high-frequency switching power module 6, and is used to realize multi-stage voltage and current detection, threshold-adjustable protection, and short-circuit spark suppression functions.

[0059] The surge protection device 9 is connected in series with the discrete intrinsic safety circuit protection module 8, and is used to suppress surge voltage on the output side.

[0060] The intrinsic safety output interface 10 is connected in series with the surge protection device 9, and is used to output 12V, 18V, or 24V DC voltage.

[0061] Reference Figure 4 The discrete intrinsic safety circuit protection module 8 includes:

[0062] The pin interface 81 is used for signal data transmission between the discrete intrinsic safety circuit protection module 8 and other components of the system.

[0063] The voltage sampling unit 82 is connected in parallel to the output end of the common-mode filter 7, and is used to detect output end voltage in real time. In this embodiment, the voltage sampling unit 82 is composed of resistors R11, R12, R13, and R18, R19, R20.

[0064] The current sampling unit 83 is connected in parallel to the output end of the common-mode filter 7, and obtains load current signals through a high-precision current detection resistor connected in series. In this embodiment, the current sampling unit 83 uses precision resistors R14 and R21.

[0065] The threshold-adjustable circuit 84 is configured to dynamically adjust overvoltage, undervoltage, and overcurrent protection thresholds through a programmable resistor RW2. In this embodiment, the threshold-adjustable circuit 84 is composed of resistors R16, R17, R23, and R24.

[0066] The control chip 85 is connected in parallel to the threshold-adjustable circuit 84, and controls the on-off state of the MOSFET switch in the synchronous rectification chip 62 based on the output signals of the voltage sampling unit 82 and the current sampling unit 83. In this embodiment, the control chip 85 is composed of resistor R22, capacitor C9, and control chip U5.

[0067] The discrete intrinsic safety circuit protection module 8 is adapted to high-frequency switching power modules 6 of different voltage grades through the pin interface 81, and realizes unified protection functions.

[0068] The discrete intrinsic safety circuit includes two mutually connected switch circuits, which are connected with the common mode filter 7 and the surge protector 9 respectively. The voltage on the resistor R22 is used to generate the current limiting threshold setting, and the capacitor C1 is used to set the timing input of the IC chip control MOSFET switch. According to the IC chip specification, the FLT pin is connected to the UV pin, which can realize the automatic retry of the chip when the current is lower than the current limiting threshold after the overcurrent protection mode is removed.

[0069] The pin interface 81 of the discrete intrinsic safety circuit protection module 8 includes:

[0070] The power input pin 811 is connected in parallel with the output end of the common mode filter 7.

[0071] The voltage feedback pin 812 is connected with the optocoupling voltage reference chip 63 of the high-frequency switching power supply module 6 through optical coupling isolation.

[0072] The control signal pin 813 is connected in series with the high-frequency switching power supply module 6, which is used to transmit the switching control signal of the control chip 85 to the high-frequency switching power supply module 6.

[0073] Reference Figures 2-3 The high-frequency switching power supply module 6 includes:

[0074] The multi-mode PWM switching power supply chip 61 is connected in series with the bridge rectifier filter circuit 5, which is used to switch the working mode according to the load demand. In this embodiment, MP1584EN chip is used, which supports continuous conduction mode and discontinuous conduction mode.

[0075] The synchronous rectification chip 62 is connected in series with the high-frequency transformer 65, which is used to replace the Schottky diode. In this embodiment, Si7802DBV chip is used, which has a conduction resistance lower than 0.1Ω, significantly reducing the conduction loss.

[0076] The optocoupling voltage reference chip 63 is connected in series with the multi-mode PWM switching power supply chip 61, which is used to transmit the feedback signal of the output voltage and realize closed-loop control through optical coupling isolation. In this embodiment, HCPL-316J chip is used.

[0077] The π-type filter circuit 64 is connected in parallel with the multi-mode PWM switching power supply chip 61 and the optocoupling voltage reference chip 63, which is used to suppress high-frequency noise. In this embodiment, the π-type filter circuit 64 is composed of inductor L1, capacitor C6 and capacitor C7.

[0078] The high-frequency transformer 65 is connected in series with the bridge rectifier filter circuit 5, which is used to realize closed-loop control through optical coupling isolation. In this embodiment, PA1008P-400 transformer is used, which has a turns ratio of 1:1.5:0.5 and supports high-frequency operation.

[0079] The driving signal of the synchronous rectification chip 62 is provided by the secondary winding of the high-frequency transformer 65, and its gate is connected in series with an RC absorption circuit.

[0080] The Vcc pin of the multi-mode PWM switching power supply chip 61 is connected to the synchronous rectification chip 62 through the resistor R3, serving as the input power supply during AC power-up. After the output voltage is established, the multi-mode PWM switching power supply chip 61 is continuously powered by the feedback winding of the high-frequency transformer 65 through the diode D2. The D pin of the multi-mode PWM switching power supply chip 61 is the drain of the internal high-voltage MOSFET, which is the PWM output, passing through the drain voltage peak absorption network composed of the resistor R2, the capacitor C3, and the diode D1. The resistor R1 is used to set the output current overcurrent protection value. The COMP pin is the voltage feedback pin, which is connected to the optocoupling voltage reference chip 63 through the secondary output voltage feedback circuit to adjust the PWM duty cycle and control the output voltage to be stable and constant.

[0081] The discrete intrinsic safety circuit protection module 8 further comprises:

[0082] The double isolation circuit is connected in series with the common-mode filter 7 and the surge protection device two 9, respectively, for realizing high and low voltage isolation through optical coupling and magnetic isolation elements.

[0083] The dynamic response unit is connected in series with the intrinsic safety output interface 10, for cutting off the output and triggering the self-recovery mechanism within a preset time when a short-circuit fault is detected.

[0084] The shell of the discrete intrinsic safety circuit protection module 8 is made of flame-retardant material, and the surface is provided with heat dissipation fins 87 and an EMI shielding layer 88.

[0085] Working principle: In actual operation, the improved mine intrinsic safety power supply of the embodiment is powered by 220V AC power through the AC input interface, which is sequentially passed through the overcurrent protector, the surge protection device one, and the EMC anti-interference circuit, ensuring the safety and anti-interference ability of the input side. Subsequently, the bridge rectifier filter circuit converts the AC power into stable DC power. The high-frequency switching power supply module converts the DC power into high-frequency AC power, and the voltage conversion is realized through the high-frequency transformer. The synchronous rectification chip replaces the traditional diode, improving the conversion efficiency. The π-type filter circuit suppresses high-frequency noise, ensuring the stability of the output voltage. The optocoupling voltage reference chip realizes closed-loop control through the feedback signal, maintaining the constant output voltage. The intrinsic safety circuit performs multi-stage voltage and current detection and protection, dynamically adjusts the protection threshold, and ensures precise protection in the event of overvoltage, undervoltage, overcurrent, or short-circuit failure. Finally, the surge protection device two further suppresses the surge voltage on the output side, providing 12V, 18V, or 24V DC voltage through the intrinsic safety output interface.

[0086] In addition, the modular design of the present embodiment enables the same intrinsically safe protection module to be applicable to output requirements of multiple voltage levels, reducing research and production costs. Secondly, the dynamic threshold adjustment function and fast response mechanism significantly improve the dynamic protection capability of the system, reducing the possibility of false triggering and missed triggering. Thirdly, the design of the discrete intrinsically safe circuit protection module simplifies the structure of the main circuit board, making maintenance and replacement more convenient. Finally, by optimizing the synchronous rectification chip and π-type filter circuit design of the high-frequency switching power supply module, the conversion efficiency and anti-interference capability of the power supply are significantly improved. These improvements not only enhance the safety, adaptability and efficiency of the system, but also provide important technical support for the intelligentization and high efficiency development of mine-used power supplies.

[0087] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An improved intrinsically safe power supply for mining, characterized in that, The application relates to an isolated intrinsic safety circuit protection module. The application relates to an isolated intrinsic safety circuit protection module. The application relates to an isolated intrinsic safety circuit protection module. The application relates to an isolated intrinsic safety circuit protection module. The application relates to an isolated intrinsic safety circuit protection module. The application relates to an isolated intrinsic safety circuit protection module. The application relates to an isolated intrinsic safety circuit protection module.

2. An improved intrinsically safe power supply for mine use according to claim 1, characterized in that, The application relates to an isolated intrinsic safety circuit protection module. The application relates to an isolated intrinsic safety circuit protection module. The application relates to an isolated intrinsic safety circuit protection module. The application relates to an isolated intrinsic safety circuit protection module. The application relates to an isolated intrinsic safety circuit protection module.

3. An improved intrinsically safe power supply for mine use as claimed in claim 1, wherein The application relates to an isolated intrinsic safety circuit protection module. The application relates to an isolated intrinsic safety circuit protection module. The application relates to an isolated intrinsic safety circuit protection module. The application relates to an isolated intrinsic safety circuit protection module. The application relates to an isolated intrinsic safety circuit protection module. The application relates to an isolated intrinsic safety circuit protection module.

4. An improved intrinsically safe power supply for mine use according to claim 3, characterized in that, The application relates to an isolated intrinsic safety circuit protection module.

5. An improved intrinsically safe power supply for mine use as claimed in claim 3, wherein The application relates to an isolated intrinsic safety circuit protection module. The application relates to an isolated intrinsic safety circuit protection module. The application relates to an isolated intrinsic safety circuit protection module. The application relates to an isolated intrinsic safety circuit protection module.

6. An improved intrinsically safe power supply for mine use as defined in claim 1, wherein, The application relates to an isolated intrinsic safety circuit protection module. The application relates to an isolated intrinsic safety circuit protection module. The application relates to an isolated intrinsic safety circuit protection module. The application relates to an isolated intrinsic safety circuit protection module. The application relates to an isolated intrinsic safety circuit protection module. The application relates to an isolated intrinsic safety circuit protection module. The application relates to an isolated intrinsic safety circuit protection module. The application relates to an isolated intrinsic safety circuit protection module. The application relates to an isolated intrinsic safety circuit protection module. The application relates to an isolated intrinsic safety circuit protection module. 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7. An improved intrinsically safe power supply for mine use according to claim 6, characterized in that, The drive signal of the synchronous rectification chip (62) is provided by the secondary winding of the high-frequency transformer (65), and the gate electrode of the synchronous rectification chip (62) is connected in series with an RC absorption circuit.

8. The improved intrinsically safe power supply for mine use according to claim 1, characterized in that, The discrete intrinsic safety circuit protection module (8) further comprises: A double-isolation circuit is connected in series with the common-mode filter (7) and the surge protector (9) respectively, for realizing high-low voltage isolation through optocoupling and magnetic isolation elements; A dynamic response unit is connected in series with the intrinsic safety output interface (10), for cutting off the output and triggering a self-recovery mechanism within a preset time when a short-circuit fault is detected.

9. The improved intrinsically safe power supply for use in mines as claimed in claim 1 wherein, The shell of the discrete intrinsic safety circuit protection module (8) is made of a flame-retardant material, and the surface is provided with heat dissipation fins (87) and an EMI shielding layer (88).

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