CN218888397U - Explosion-proof and intrinsically safe DC voltage-stabilized power supply for coal mine - Google Patents

Abstract

The utility model discloses a flame proof and intrinsically safe type direct current stabilized voltage power supply for coal mine relates to colliery machinery. The utility model comprises a power supply, an intrinsically safe power supply and an intrinsically safe power supply output end; the power supply, the intrinsically safe power supply and the intrinsically safe power supply output end are connected in sequence; and an explosion-proof shell is arranged outside the intrinsic safety type power supply. The utility model discloses have the flame proof shell, this shell can bear the explosive pressure that its inside explosive gas mixture detonates the production, can prevent again that the explosive product from wearing out the explosive mixture around the flame proof clearance lights the shell. The DC voltage of the mining explosion-proof and intrinsic safety type DC voltage-stabilizing power supply is isolated by a DC/DC isolation module of an output intrinsic safety type power supply to obtain stable DC voltage, and the DC voltage is output by the intrinsic safety type power supply after passing through an overvoltage and overcurrent protection circuit.

Description

Explosion-proof and intrinsically safe DC voltage-stabilized power supply for coal mine

Technical Field

The utility model relates to a coal mine machinery field, more specifically the utility model relates to a flame proof and intrinsically safe type direct current constant voltage power supply for coal mine that says so.

Background

At present, in China coal mines, intrinsically safe equipment cannot be used for roadway construction and coal excavation. An important link of intrinsically safe electrical equipment is an intrinsically safe power supply, which has two basic types: the power supply comprises an independent power supply and an external power supply, wherein the independent power supply refers to a dry battery, a storage battery and the like, and the external power supply refers to a power supply which is introduced by power electricity and is supplied with power by a power transformer. Most of power supplies of intrinsically safe electrical equipment used underground in the coal mine are introduced into the power supplies rectified by a power transformer from a power grid, and the power supplies are generally explosion-proof and intrinsically safe.

The intrinsic safety type independent power supply cannot output stable direct-current voltage, and the power supply can be always connected into a circuit no matter whether a power grid is electrified or not, so that effective protection is lacked

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides a flame proof and intrinsically safe type DC voltage stabilizing power supply for coal mine has the flame proof shell, and this shell can bear the explosive pressure that its inside explosive gas mixture detonated and produced, can prevent again that the explosive product from wearing out the flame proof clearance and lighting the explosive mixture around the shell. The DC voltage of the mining explosion-proof and intrinsic safety type DC voltage-stabilized power supply is isolated by a DC/DC isolation module of an output intrinsic safety type power supply to obtain stable DC voltage, and the DC voltage is output by the intrinsic safety power supply after passing through an overvoltage and overcurrent protection circuit.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a flame-proof and intrinsically safe DC voltage-stabilized power supply for coal mines comprises a power supply, an intrinsically safe power supply and an intrinsically safe power output end; the power supply, the intrinsically safe power supply and the intrinsically safe power supply output end are connected in sequence;

and the explosion-proof shell is arranged outside the intrinsic safety type power supply.

Optionally, the intrinsically safe power supply includes a rectifier filter circuit, a dc voltage regulator circuit, and a protection circuit; the rectification filter circuit, the direct current voltage stabilizing circuit and the protection circuit are connected in sequence.

Optionally, the chip of the protection circuit is LTC4211.

Optionally, the intrinsically safe power supply is further provided with a DC/DC isolation module, and the DC/DC isolation module, the rectification filter circuit, the direct-current voltage stabilizing circuit and the protection circuit are sequentially connected.

Optionally, the rated power supply voltage of the power supply is DC24V, and the voltage fluctuation range is DC 18-36V; the rated input apparent power is less than or equal to 100VA.

Can know via foretell technical scheme, compare with prior art, the utility model discloses a flame proof and intrinsically safe type DC voltage stabilizing power supply for coal mine has following beneficial effect:

the power supply circuit is suitable for supplying power to various intrinsically safe electrical equipment, has wide application range, simple operation, high reliability and strong capacitive load capacity, obtains different output voltages and currents by adjusting the parameters of corresponding resistors and capacitors, and can be designed into an assembly for different products; the protection speed is high, when the load is in short circuit or the output current exceeds the maximum output current, the sampling resistor Rs1 detects an overcurrent signal, the GATE pin outputs a low level to turn off the Q1, the power supply does not output, and after the overcurrent or short circuit disappears, the GATE outputs a high level to turn on the Q1 and restore the normal operation of the power supply. When the output voltage exceeds the set voltage and overvoltage occurs, the FB pin obtains an overvoltage signal through the voltage dividing resistor, and then the Q1 is turned off to control output. Meanwhile, a complex debugging process is not needed, only the input end and the output end are correctly wired, the connection is firm, and the safe operation under the coal mine is realized.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is an electrical schematic diagram of the flame-proof and intrinsically safe DC voltage-stabilized power supply for mining of the utility model;

fig. 2 is a schematic diagram of the protection circuit of the present invention;

fig. 3 is a DC/DC schematic diagram of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The embodiment of the utility model discloses a flameproof and intrinsically safe DC voltage-stabilized power supply for coal mine, which comprises a power supply, an intrinsically safe power supply and an intrinsically safe power output end, as shown in figure 1; the power supply, the intrinsically safe power supply and the intrinsically safe power supply output end are connected in sequence; an explosion-proof shell is arranged outside the intrinsic safety type power supply.

Further, the rated supply voltage of the power supply: DC24V, voltage fluctuation range: DC 18-36V; rated input apparent power: less than or equal to 100VA.

Outputting an intrinsic safety power supply: the input of the non-safety voltage is isolated by a DC/DC isolation module of the output intrinsic safety type power supply to obtain stable direct current voltage, and the direct current passes through an overvoltage and overcurrent protection circuit to provide output of the intrinsic safety power supply.

Outputting an intrinsically safe power supply: the output intrinsic safety type power supply consists of a rectifying filter circuit, a direct current voltage stabilizing circuit and a protection circuit. The working principle is that the direct current voltage is subjected to DC/DC voltage reduction, then is subjected to links such as rectification, filtering and the like to output the direct current voltage, and then is subjected to voltage stabilization to obtain stable voltage output.

Further, as shown in fig. 3, the non-safety voltage input is isolated by a DC/DC isolation module of the intrinsically safe power supply to obtain a stable direct current voltage, and the direct current voltage passes through an overvoltage and overcurrent protection circuit to provide an intrinsically safe power supply output to supply power to the intrinsically safe electrical equipment for mining.

As shown in fig. 2, the protection circuit main chip adopts LTC4211, which is a hot plug controller. An internal high side switch driver is used to control the gate of an external N-channel MOSFET to achieve a voltage supply range of 2.5V to 16.5V. The LTC4211 provides soft start and inrush current limiting functions during start-up (which has a programmable duration). The two on-chip current limiting comparators are responsible for providing a two-stage overcurrent circuit breaker protection function. The slow comparator jumps from VCC-50mV and starts within 20 mus (or time set by an external filter capacitor). The fast comparator then jumps at VCC-150mV and can typically respond in 300ns of time. The FB pin is used for monitoring the output power supply voltage and sending an indication signal to the RESET output pin. The ON pin signal is responsible for turning the chip ON and off and may also be used to provide a reset function. MS packaged devices have FAULT and FILTER pins to provide additional functionality with an external zener diode clamp, such as: fault indication, automatic retry or lockout modes, programmable current limit response times, and programmable overvoltage protection. The chip is the existing technology and is installed in an output intrinsic safety type power supply module.

When the switch is closed, the voltage applied to the two ends of the inductor is (Vi-Vo), and at the moment, the inductor is excited by the voltage (Vi-Vo), and the magnetic flux increased by the inductor is as follows: (Vi-Vo) Ton. When the switch is switched off, the diode VD becomes conductive due to the continuity of the output current, the inductance demagnetizes, and the magnetic flux reduced by the inductance is: (Vo) Toff. When the states of the switch closure and the switch opening reach balance, (Vi-Vo) × Ton = (Vo) × Toff, since the duty ratio D <1, vi > Vo, the voltage reduction function is realized.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (5)

1. An explosion-proof and intrinsically safe direct-current voltage-stabilized power supply for a coal mine is characterized by comprising a power supply, an intrinsically safe power supply and an intrinsically safe power supply output end; the power supply, the intrinsically safe power supply and the intrinsically safe power output end are connected in sequence;

and an explosion-proof shell is arranged outside the intrinsic safety type power supply.

2. The flameproof and intrinsically safe direct-current voltage-stabilized power supply for the coal mine according to claim 1, wherein the intrinsically safe power supply comprises a rectification filter circuit, a direct-current voltage-stabilized circuit and a protection circuit; the rectification filter circuit, the direct current voltage stabilizing circuit and the protection circuit are connected in sequence.

3. The explosion-proof and intrinsically safe DC voltage-stabilized power supply for coal mines as claimed in claim 2, wherein a chip of the protection circuit adopts LTC4211.

4. The flameproof and intrinsically safe direct-current voltage-stabilized power supply for the coal mine according to claim 2, characterized in that the intrinsically safe power supply is further provided with a DC/DC isolation module, and the DC/DC isolation module, the rectification filter circuit, the direct-current voltage-stabilized circuit and the protection circuit are sequentially connected.

5. The explosion-proof and intrinsically safe direct-current voltage-stabilized power supply for the coal mine according to claim 1, wherein rated power supply voltage of the power supply is DC24V, and voltage fluctuation range is DC 18-36V; the rated input apparent power is less than or equal to 100VA.

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