Wide-input-voltage high-power double-circuit mining intrinsic safety power supply and underground coal mine fully-mechanized mining system

Abstract

The utility model relates to the technical field of coal mine equipment, and provides a wide-input-voltage high-power double-circuit mining intrinsic safety power supply and an underground coal mine fully mechanized coal mining system, the intrinsic safety power supply comprises a filtering and rectifying circuit, and the input end of the filtering and rectifying circuit is connected with an alternating current power supply; the rectifier is used for filtering and rectifying alternating current input by an alternating current power supply; the input end of the flyback converter circuit is connected with the output end of the filtering and rectifying circuit, and the flyback converter circuit is used for converting alternating current into direct current; and at least two overvoltage and overcurrent protection circuits, the input end of each overvoltage and overcurrent protection circuit is connected with the output end of the flyback converter circuit, and the output end of each overvoltage and overcurrent protection circuit is connected with coal mine electric equipment. The high-power intrinsically safe power supply with a wide voltage function and high output efficiency is provided, and due to the arrangement of at least two paths, the volume of the intrinsically safe power supply module is reduced, and the output power and the output efficiency of the intrinsically safe power supply are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of coal mine equipment, in particular to a wide input voltage high-power dual-channel intrinsically safe power supply for coal mines and a fully mechanized coal mining system underground in coal mines. Background Art

[0002] With the rapid development of coal mine automation and unmanned operation, intelligent devices such as controllers, base stations and sensors are widely used in the fully mechanized coal mining automation control system underground in coal mines. And as the intrinsically safe power supply for powering the control system, its performance directly affects the reliability and stability of the entire control system. In addition, due to the large number of electromechanical devices underground in coal mines, there is great pressure on installation, commissioning and maintenance. This requires that the power supply device meet the higher requirements for miniaturized design of products without affecting performance. At the same time, there are many intrinsically safe devices in the fully mechanized coal mining automation control system, bringing relatively high cost pressure to production operation and maintenance. Summary of the Utility Model

[0003] The utility model provides a wide input voltage high-power dual-channel intrinsically safe power supply for coal mines and a fully mechanized coal mining system underground in coal mines, so as to solve the problems that the power converter of the existing intrinsically safe power supply adopts a linear power supply composed of a power frequency transformer or a pulse width modulation hard-switching single-ended flyback power supply, with problems such as a relatively large volume of the power supply module, a narrow voltage input range, a small output power and a low output efficiency.

[0004] According to a wide input voltage high-power dual-channel intrinsically safe power supply for coal mines provided by the first aspect of the utility model, it includes: a filtering and rectifying circuit, the input end of the filtering and rectifying circuit is connected to an AC power supply, and is used for filtering and rectifying the alternating current input by the AC power supply; a flyback converter circuit, the input end of the flyback converter circuit is connected to the output end of the filtering and rectifying circuit, and is used for converting the alternating current into direct current; at least two overvoltage and overcurrent protection circuits, the input end of each overvoltage and overcurrent protection circuit is connected to the output end of the flyback converter circuit, and the output end of each overvoltage and overcurrent protection circuit is connected to a coal mine electrical equipment.

[0005] According to an embodiment of the utility model, the filtering and rectifying circuit includes: a rectifier bridge, the input end of the rectifier bridge is connected to the AC power supply, and the output end of the rectifier bridge is connected to the input end of the flyback converter circuit.

[0006] Specifically, this embodiment provides an implementation manner of the filtering and rectifying circuit.

[0007] According to an embodiment of the present utility model, the flyback converter circuit includes: a control chip, a transformer, and an output voltage stabilization feedback circuit; one end of the control chip is connected to the filtering and rectifying circuit, and the other end of the control chip is connected to the transformer and the output voltage stabilization feedback circuit; the output end of the output voltage stabilization feedback circuit is connected to the input end of the overvoltage and overcurrent protection circuit.

[0008] Specifically, this embodiment provides an implementation manner of a flyback converter circuit.

[0009] According to an embodiment of the present utility model, the output voltage stabilization feedback circuit includes: a voltage reference source circuit and an optocoupler; the input end of the voltage reference source circuit is connected to the transformer, and the output end of the voltage reference source circuit is connected to the input end of the overvoltage and overcurrent protection circuit; the optocoupler is arranged in parallel with the transformer, and the input end of the optocoupler is connected to the control chip, and the output end of the optocoupler is connected to the input end of the voltage reference source circuit.

[0010] Specifically, this embodiment provides an implementation manner of an output voltage stabilization feedback circuit.

[0011] According to an embodiment of the present utility model, the control chip is a chip integrated with gallium nitride by PWM in a co-packaged form.

[0012] Specifically, this embodiment provides an implementation manner of a control chip.

[0013] According to an embodiment of the present utility model, the maximum operating frequency of the control chip is 260 KHz, and the maximum output efficiency is greater than 83%.

[0014] Specifically, this embodiment provides another implementation manner of a control chip.

[0015] According to an embodiment of the present utility model, the overvoltage and overcurrent protection circuit includes at least two levels of intrinsically safe protection circuits; the intrinsically safe protection circuit includes: a protection chip, a current sampling resistor, and a voltage sampling resistor; the protection chip is connected to the output end of the flyback converter circuit, and is used to provide protection for the intrinsically safe power supply and the circuit connected to the intrinsically safe power supply; the current sampling resistor and the voltage sampling resistor are respectively connected to the functional pins of the protection chip, and are used to feedback the output current and voltage to the protection chip.

[0016] Specifically, this embodiment provides an implementation manner of an overvoltage and overcurrent protection circuit.

[0017] According to an embodiment of the present utility model, the overcurrent protection value of the current sampling resistor is greater than or equal to 2.5 A, and the overvoltage protection value of the voltage sampling resistor is greater than or equal to 12.5 V.

[0018] Specifically, this embodiment provides an implementation manner of a current sampling resistor and a voltage sampling resistor.

[0019] According to an implementation manner of the present utility model, the protection chip is provided with a protection recovery time, and the protection recovery time is less than or equal to 7.78 ms.

[0020] Specifically, this embodiment provides an implementation manner of a protection chip.

[0021] According to a fully-mechanized coal mining system underground in a coal mine provided in the second aspect of the present utility model, it includes the above-mentioned wide input voltage high-power dual-channel intrinsically safe power supply for mine use.

[0022] One or more of the above technical solutions in the present utility model have at least one of the following technical effects: A wide input voltage high-power dual-channel intrinsically safe power supply for mine use and a fully-mechanized coal mining system underground in a coal mine provided by the present utility model, by setting the intrinsically safe circuit as a filtering and rectifying circuit, a flyback converter circuit, and at least two overvoltage and overcurrent protection circuits, provide a high-power intrinsically safe power supply with high output efficiency for wide voltage function, and due to at least dual-channel setting, reduce the volume of the intrinsically safe power supply module, and improve the output power and output efficiency of the intrinsically safe power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0024] Figure 1 is one of the circuit layout relationship diagrams of the wide input voltage high-power dual-channel intrinsically safe power supply for mine use provided by the present utility model.

[0025] Figure 2 is the second of the circuit layout relationship diagrams of the wide input voltage high-power dual-channel intrinsically safe power supply for mine use provided by the present utility model.

[0026] Figure 3 is the third of the circuit layout relationship diagrams of the wide input voltage high-power dual-channel intrinsically safe power supply for mine use provided by the present utility model.

[0027] Figure 4 is the fourth of the circuit layout relationship diagrams of the wide input voltage high-power dual-channel intrinsically safe power supply for mine use provided by the present utility model.

[0028] Reference Signs:

[0029] 10. Filtering and rectifying circuit; 11. Rectifier bridge

[0030] 20. Flyback converter circuit; 21. Control chip; 22. Transformer; 23. Output voltage stabilizing feedback circuit; 231. Voltage reference source circuit; 232. Optocoupler

[0031] 30. Overvoltage and overcurrent protection circuit; 31. Intrinsic safety protection circuit; 311. Protection chip; 312. Current sampling resistor; 313. Voltage sampling resistor Detailed implementation manners

[0032] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts shall fall within the protection scope of the present utility model.

[0033] In the description of the embodiments of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the embodiments of the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the embodiments of the present utility model. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0034] The present utility model will be specifically described below in conjunction with the detailed implementation manners.

[0035] In some specific implementation schemes of the present utility model, as Figures 1 to 4 shown, the present solution provides a wide input voltage high-power dual-channel intrinsically safe power supply for mine use, including: a filtering and rectifying circuit 10, the input end of the filtering and rectifying circuit 10 is connected to an AC power supply, and is used for filtering and rectifying the alternating current input by the AC power supply; a flyback converter circuit 20, the input end of the flyback converter circuit 20 is connected to the output end of the filtering and rectifying circuit 10, and is used for converting the alternating current into direct current; at least two overvoltage and overcurrent protection circuits 30, the input end of each overvoltage and overcurrent protection circuit 30 is connected to the output end of the flyback converter circuit 20, and the output end of each overvoltage and overcurrent protection circuit 30 is connected to a coal mine electrical equipment.

[0036] In some possible embodiments of the present utility model, the filtering and rectifying circuit 10 includes: a rectifier bridge 11, the input end of the rectifier bridge 11 is connected to an AC power supply, and the output end of the rectifier bridge 11 is connected to the input end of the flyback converter circuit 20.

[0037] Specifically, this embodiment provides an implementation manner of the filtering and rectifying circuit 10. The current output by the AC power supply undergoes AC filtering, rectification, and DC filtering through the rectifier bridge 11 to obtain a specified voltage.

[0038] In some possible embodiments of the present utility model, the flyback converter circuit 20 includes: a control chip 21, a transformer 22, and an output voltage stabilizing feedback circuit 23; one end of the control chip 21 is connected to the filtering and rectifying circuit 10, and the other end of the control chip 21 is connected to the transformer 22 and the output voltage stabilizing feedback circuit 23; the output end of the output voltage stabilizing feedback circuit 23 is connected to the input end of the overvoltage and overcurrent protection circuit 30.

[0039] Specifically, this embodiment provides an implementation manner of the flyback converter circuit 20. The filtered current passes through the control chip 21, the transformer 22, and the output voltage stabilizing feedback circuit 23 to obtain an isolated and stable DC 12.5V intrinsically safe power supply.

[0040] In some possible embodiments of the present utility model, the output voltage stabilizing feedback circuit 23 includes: a voltage reference source circuit 231 and an optocoupler 232; the input end of the voltage reference source circuit 231 is connected to the transformer 22, and the output end of the voltage reference source circuit 231 is connected to the input end of the overvoltage and overcurrent protection circuit 30; the optocoupler 232 is arranged in parallel with the transformer 22, and the input end of the optocoupler 232 is connected to the control chip 21, and the output end of the optocoupler 232 is connected to the input end of the voltage reference source circuit 231.

[0041] Specifically, this embodiment provides an implementation manner of the output voltage stabilizing feedback circuit 23. The voltage reference source circuit 231 and the optocoupler 232 constitute the output voltage stabilizing feedback circuit 23.

[0042] In some possible embodiments of the present utility model, the control chip 21 is a chip integrated with gallium nitride by PWM and hermetically sealed.

[0043] Specifically, this embodiment provides an implementation manner of the control chip 21. The control chip 21 provided by the present utility model is a chip integrated with gallium nitride by PWM and hermetically sealed, belonging to soft switching. Due to the increase in the switching frequency, the volume of the transformer 22 and the filtering devices in the DC / DC converter can be greatly reduced, so the power density of the power supply is improved.

[0044] In a possible embodiment, the control chip 21 is a quasi-resonant flyback gallium nitride co-packaged chip, operating in a quasi-resonant state, belonging to soft switching, and having small switching losses.

[0045] In some possible embodiments of the present invention, the maximum operating frequency of the control chip 21 is 260 KHz, and the maximum output efficiency is greater than 83%.

[0046] Specifically, this embodiment provides another implementation manner of the control chip 21. The control chip 21 provided by the present invention has a maximum operating frequency of 260 KHz and a maximum output efficiency greater than 83%. Compared with the conventional intrinsically safe power supply, the efficiency can be increased by about 10%.

[0047] It should be noted that the power converters of common intrinsically safe power supplies adopt linear power supplies constituted by power frequency transformers 22 or pulse width modulation hard-switching single-ended flyback power supplies. The linear power supply constituted by the power frequency transformer 22 has a large volume, a narrow input range, and a very low output efficiency, generally 30% - 60%. Although the general single-ended flyback power supply with pulse width modulation has a wide input range, due to the switching tube operating in a hard-switching state, it has large switching losses, the switching frequency is up to about 100 KHz at most, and the efficiency is generally 70% - 85%.

[0048] In some possible embodiments of the present invention, the overvoltage and overcurrent protection circuit 30 includes at least two levels of intrinsically safe protection circuits 31; the intrinsically safe protection circuit 31 includes: a protection chip 311, a current sampling resistor 312, and a voltage sampling resistor 313; the protection chip 311 is connected to the output end of the flyback converter circuit 20, and is used to provide protection for the intrinsically safe power supply and the circuit connected to the intrinsically safe power supply; the current sampling resistor 312 and the voltage sampling resistor 313 are respectively connected to the functional pins of the protection chip 311, and are used to feedback the output current and voltage to the protection chip 311.

[0049] Specifically, this embodiment provides an implementation manner of the overvoltage and overcurrent protection circuit 30. In the power supply circuit design of this case of the present invention, at least two levels of this case protection circuits are designed, and a protection chip 311 for this case power supply is adopted. The protection chip 311 is provided with overvoltage and filtering protection, which can provide fast protection for the power supply circuit, making the output of general switching power supplies and linear power supplies have intrinsically safe characteristics.

[0050] In a possible embodiment, the overvoltage and overcurrent protection of the protection chip 311 is achieved by setting the resistance of the functional pins.

[0051] In a possible embodiment, the overvoltage and overcurrent protection of the protection chip 311 is achieved by an external capacitor and the output slow start time.

[0052] In some possible embodiments of the present utility model, the overcurrent protection value of the current sampling resistor 312 is greater than or equal to 2.5 A, and the overvoltage protection value of the voltage sampling resistor 313 is greater than or equal to 12.5 V.

[0053] Specifically, this embodiment provides an implementation manner of the current sampling resistor 312 and the voltage sampling resistor 313. By setting the current sampling resistor 312 and the voltage sampling resistor 313, overvoltage protection and overcurrent protection for the intrinsically safe power supply are achieved.

[0054] In a possible embodiment, when the current flowing through the current sampling resistor 312 exceeds 2.5 A, the chip monitors the voltage difference across the resistor and will turn off the field effect transistor in a very short time to complete overcurrent protection.

[0055] In a possible embodiment, when the output voltage sampling resistor 313 monitors that the output voltage exceeds 12.5 V, the internal voltage comparator of the chip flips, and the field effect transistor is turned off in a very short time to achieve overvoltage protection.

[0056] In some possible embodiments of the present utility model, the protection chip 311 is provided with a protection recovery time, and the protection recovery time is less than or equal to 7.78 ms.

[0057] Specifically, this embodiment provides an implementation manner of the protection chip 311. The setting of the protection recovery time, combined with overvoltage and overcurrent protection, enables reliable protection of the output even when a counting failure occurs, and avoids false operations during power startup.

[0058] In some specific implementation schemes of the present utility model, as Figures 1 to 4 shown, this solution provides a fully-mechanized coal mining system underground in a coal mine, including the above-mentioned wide input voltage high-power dual-channel intrinsically safe power supply for mines.

[0059] In the description of the embodiments of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific situations.

[0060] In the embodiments of the present utility model, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on the top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "below" and "beneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply indicates that the horizontal height of the first feature is less than that of the second feature.

[0061] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "mode", "specific mode", or "some modes" etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or mode are included in at least one embodiment or mode of the embodiments of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or mode. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or modes. In addition, without contradiction, those skilled in the art may combine and combine the different embodiments or modes described in this specification and the features of different embodiments or modes.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the present utility model, rather than to limit the present utility model. Although the present utility model has been described in detail with reference to the embodiments, those of ordinary skill in the art should understand that various combinations, modifications or equivalent replacements of the technical solutions of the present utility model do not depart from the spirit and scope of the technical solutions of the present utility model, and should all be covered within the scope of the claims of the present utility model.

Claims

1. A wide input voltage high-power dual-channel intrinsically safe power supply for mine use, characterized in that, Comprising: A filtering and rectifying circuit (10), the input end of the filtering and rectifying circuit (10) is connected to an AC power supply, and is used for filtering and rectifying the alternating current input by the AC power supply; A flyback converter circuit (20), the input end of the flyback converter circuit (20) is connected to the output end of the filtering and rectifying circuit (10), and is used for converting alternating current into direct current; At least two overvoltage and overcurrent protection circuits (30), the input end of each overvoltage and overcurrent protection circuit (30) is connected to the output end of the flyback converter circuit (20), and the output end of each overvoltage and overcurrent protection circuit (30) is connected to a coal mine electrical equipment.

2. The wide-input-voltage high-power dual-channel intrinsically safe power supply for mine use according to claim 1, characterized in that, The filtering and rectifying circuit (10) includes: a rectifier bridge (11), the input end of the rectifier bridge (11) is connected to the AC power supply, and the output end of the rectifier bridge (11) is connected to the input end of the flyback converter circuit (20).

3. The wide-input-voltage high-power dual-channel intrinsically safe power supply for mine use according to claim 1, wherein The flyback converter circuit (20) includes: a control chip (21), a transformer (22) and an output voltage stabilizing feedback circuit (23); One end of the control chip (21) is connected to the filtering and rectifying circuit (10), and the other end of the control chip (21) is connected to the transformer (22) and the output voltage stabilizing feedback circuit (23); The output end of the output voltage stabilizing feedback circuit (23) is connected to the input end of the overvoltage and overcurrent protection circuit (30).

4. The wide-input-voltage high-power dual-channel intrinsically safe power supply for mine use according to claim 3, characterized in that, The output voltage stabilizing feedback circuit (23) includes: a voltage reference source circuit (231) and an optocoupler (232); The input end of the voltage reference source circuit (231) is connected to the transformer (22), and the output end of the voltage reference source circuit (231) is connected to the input end of the overvoltage and overcurrent protection circuit (30); The optocoupler (232) is arranged in parallel with the transformer (22), and the input end of the optocoupler (232) is connected to the control chip (21), and the output end of the optocoupler (232) is connected to the input end of the voltage reference source circuit (231).

5. The wide input voltage high-power dual-channel intrinsically safe power supply for mine use according to claim 3, characterized in that, The control chip (21) is a chip integrated with gallium nitride by PWM.

6. The wide-input-voltage high-power dual-channel intrinsically safe power supply for mine use according to claim 3, wherein The highest operating frequency of the control chip (21) is 260KHz, and the highest output efficiency is greater than 83%.

7. The wide-input-voltage high-power dual-channel intrinsically safe power supply for mine use according to any one of claims 1 to 6, characterized in that, The overvoltage and overcurrent protection circuit (30) includes at least two levels of intrinsically safe protection circuits (31); The intrinsically safe protection circuit (31) includes: a protection chip (311), a current sampling resistor (312) and a voltage sampling resistor (313); The protection chip (311) is connected to the output end of the flyback converter circuit (20), and is used for providing protection for the intrinsically safe power supply and the circuit connected to the intrinsically safe power supply; The current sampling resistor (312) and the voltage sampling resistor (313) are respectively connected to the functional pins of the protection chip (311), and are used for feeding back the output current and voltage to the protection chip (311).

8. The wide-input-voltage high-power dual-channel intrinsically safe power supply for mine use according to claim 7, characterized in that, The overcurrent protection value of the current sampling resistor (312) is greater than or equal to 2.5A, and the overvoltage protection value of the voltage sampling resistor (313) is greater than or equal to 12.5V.

9. The wide-input-voltage high-power dual-channel intrinsically safe power supply for mine use according to claim 7, wherein The protection chip (311) is provided with a protection recovery time, and the protection recovery time is less than or equal to 7.78 ms.

10. A fully-mechanized mining system underground in a coal mine, characterized in that, It includes the wide-input-voltage high-power dual-channel intrinsically safe power supply for mine use according to any one of the above-mentioned claims 1 to 9.

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