CN204258412U - Intrinsically safe circuit, explosion-suppression and intrinsic safety uninterrupted power supply control system and power supply - Google Patents

Abstract

The utility model relates to an intrinsically safe circuit, a flameproof and intrinsically safe uninterruptible power supply control system and a power supply, wherein the intrinsically safe circuit includes one or any combination of an overvoltage protection circuit, an overcurrent protection circuit and a short circuit protection circuit; The intrinsically safe uninterruptible power supply control system includes a magnetic control switch circuit, an AC/DC integrated conversion circuit, a DC/DC conversion circuit, a battery charge and discharge management circuit, an intrinsically safe circuit, and a battery pack, and realizes uninterrupted operation through the switching of the AC power supply and the battery pack. Power supply; small flameproof and intrinsically safe uninterruptible power supply, including flameproof and intrinsically safe uninterruptible power supply control system and flameproof housing. The utility model has the characteristics of simple system structure, easy assembly, small size and light weight, and has obvious advantages in market competition. It can be widely used in underground communication systems and monitoring and monitoring systems, and has good application prospects.

Description

Intrinsically safe circuit, flameproof and intrinsically safe uninterruptible power supply control system and power supply

technical field

The utility model relates to an intrinsically safe circuit, a flameproof and intrinsically safe uninterruptible power supply control system and a power supply.

Background technique

With the modernization of coal mine management, more and more intrinsically safe devices are used in coal mines, so it is necessary to design an effective and practical intrinsically safe circuit. At the same time, the explosion-proof and intrinsically safe uninterruptible power supply is an indispensable part of the intrinsically safe system. Its technological advancement and product quality determine the reliability of the intrinsically safe equipment and directly affect the working stability of the monitoring and monitoring system and the communication system. to mine safety production, disaster resilience and miner safety. Since the underground communication system and monitoring and monitoring system have many base stations and monitoring equipment, and they are separated by a long distance, the base stations and monitoring equipment must have a backup power supply, which can still work for more than 2 hours during a power outage. Therefore, it is required that the power supply for the base station or monitoring equipment must be an explosion-proof and intrinsically safe uninterruptible power supply, and it should be miniaturized as much as possible for easy installation and movement.

There are many types of explosion-proof and intrinsically safe uninterruptible power supplies currently on the market, most of which have the disadvantages of large size, heavy weight, and difficult installation.

Utility model content

The utility model aims at at least solving the technical problems existing in the prior art, and particularly innovatively proposes an intrinsically safe circuit with a simple circuit structure, which realizes intrinsic safety of the circuit from three aspects of overvoltage protection, overcurrent protection and short circuit protection characteristics.

For the above purpose, the utility model provides an intrinsically safe circuit, including one or any combination of an overvoltage protection circuit, an overcurrent protection circuit and a short circuit protection circuit, the number of the overvoltage protection circuits is m, and the overcurrent protection circuit is n, the number of short-circuit protection circuits is p, and the m, n, and p are respectively positive integers;

The overvoltage protection circuit includes: the voltage input terminal VIN is connected to the input terminal of the resistor divider, the output terminal of the resistor divider and the output terminal of the reference source respectively input the signals into the first comparator U1, and the first comparator U1 collects the voltage of the resistor divider The input voltage of the first comparator U1 is compared with the reference source voltage, the output terminal of the first comparator U1 is connected to the cathode of the first diode D1, the anode of the first diode D1 is connected to the input terminal of the trigger, and the output terminal of the trigger is connected to the gate of the transistor Q1 pole, the source of the triode Q1 is connected to the voltage input terminal VIN, and the drain of the triode Q1 is connected to the voltage output terminal VOUT;

The overcurrent protection circuit includes: the positive pole of the load is connected to the voltage output terminal VOUT, the negative pole of the load is connected to the ground through the sampling resistor Rs, the positive pole of the sampling resistor Rs is connected to the input terminal of the amplifier, and the output terminal of the amplifier and the output terminal of the reference source respectively input signals into the second comparator U2 , the second comparator U2 compares the voltage output by the amplifier with the reference source voltage, the output terminal of the second comparator U2 is connected to the cathode of the second diode D2, and the anode of the second diode D2 is connected to the trigger input terminal to trigger The output terminal of the transistor is connected to the gate of the transistor Q1, the source of the transistor Q1 is connected to the voltage input terminal VIN, and the drain of the transistor Q1 is connected to the voltage output terminal VOUT;

The short-circuit protection circuit includes: the voltage output terminal VOUT is connected to one end of the fourth resistor R4, the other end of the fourth resistor R4 and the output terminal of the reference source respectively input signals into the third comparator U3, and the voltage output terminal VOUT is connected to the voltage by the fifth resistor R5 The input terminal VIN is connected, the positive pole of the load is connected to the voltage output terminal VOUT, the negative pole of the load is grounded through the sampling resistor Rs, the output terminal of the third comparator U3 is connected to the negative pole of the third diode D3, and the positive pole of the third diode D3 is connected to the trigger The input terminal and the trigger output terminal are connected to the gate of the transistor Q1, the source of the transistor Q1 is connected to the voltage input terminal VIN, and the drain of the transistor Q1 is connected to the voltage output terminal VOUT.

When any of the three situations of overvoltage, overcurrent or short circuit occurs, the level of the flip-flop will be reversed and output a high level, the transistor Q1 will be turned off, and the voltage output terminal VOUT will output zero. Three aspects of overvoltage protection, overcurrent protection and short circuit protection realize the characteristics of intrinsic safety of the circuit.

Based on the intrinsically safe circuit, the utility model also proposes a flameproof and intrinsically safe uninterruptible power supply control system, including a magnetic control switch circuit, an AC/DC integrated conversion circuit, a DC/DC conversion circuit, and a battery charge and discharge management circuit , an intrinsically safe circuit, a battery pack, an external AC power supply connected to the first input end of the magnetic control switch circuit, the battery pack is bidirectionally connected to the magnetic control switch circuit, and the magnetic control switch circuit is used to cut off or conduct external AC power and the power supply of the battery pack; the first output end of the magnetic control switch circuit is connected to the input end of the AC/DC integrated conversion circuit, and the magnetic control switch circuit is bidirectionally connected to the battery charge and discharge management circuit; the output end of the AC/DC integrated conversion circuit is connected to To the input end of the DC/DC conversion circuit, the output end of the AC/DC conversion circuit is connected to the input end of the battery charge and discharge management circuit; the output end of the battery charge and discharge management circuit is also connected to the input end of the DC/DC conversion circuit, and the battery The charge and discharge management circuit is used for charge and discharge management of the battery pack; the output end of the DC/DC conversion circuit is connected to the input end of the intrinsically safe circuit, and the output end of the intrinsically safe circuit is used to supply power to the load.

When the AC power supply is normal, the DC power supply battery pack is charged. When the AC power supply cannot be supplied normally, the battery pack can continuously supply power to the load to ensure the normal operation.

Further, the magnetic control switch circuit has three magnetic control switches, wherein the first magnetic control switch is installed at the positive pole of the input end of the AC/DC integrated conversion circuit, and the second magnetic control switch is installed at the positive pole of the input end of the AC/DC integrated conversion circuit. The negative pole controls the on-off of the alternating current, and the third magnetic switch is installed between the input end of the battery pack interface and the output end of the battery charge-discharge management circuit to control the charge-discharge on-off of the battery pack.

Preferably, the battery charging and discharging management circuit includes a battery charging module and a battery discharging module. The battery charging module is connected to the positive pole of the battery pack through a third magnetic switch. DC power is provided to charge the battery pack; the battery discharge module is also connected to the positive pole of the battery pack through the third magnetic switch. When the battery pack is discharged, the battery discharge module monitors the voltage of the battery pack. group discharge.

The charging and discharging management circuit of the battery pack controls the charging and discharging of the battery pack to prevent the battery pack from overcharging or over-discharging.

The utility model also proposes a small flameproof and intrinsically safe uninterruptible power supply, including the flameproof and intrinsically safe uninterruptible power supply control system and a flameproof housing, the flameproof housing includes a cover plate, a flameproof Cavity, input and output bell mouth and shell for introducing input and output cables, magnets for controlling the magnetic switch circuit are installed on the cover, printed boards and batteries are installed in the explosion-proof cavity from top to bottom The printed board and the battery pack are installed on the same support board, and the AC/DC integrated conversion circuit, the charge and discharge management circuit of the battery pack, the DC/DC conversion circuit and the intrinsically safe circuit are integrated on the printed board.

Integrating the AC/DC integrated conversion circuit, the charge and discharge management circuit of the battery pack, the DC/DC conversion circuit and the intrinsically safe circuit on the printed board, and the printed board and the battery pack are also mounted on the same support board, This integrated installation method makes full use of the flameproof cavity, which reduces the volume of the flameproof shell and makes the assembly simple.

Preferably, the flameproof and intrinsically safe uninterruptible power supply control system includes a magnetically controlled switch circuit, an AC/DC integrated conversion circuit, a DC/DC conversion circuit, a battery charge and discharge management circuit, an intrinsically safe circuit, a battery pack, and an external AC power supply Connect the first input end of the magnetic control switch circuit, the battery pack is connected to the second input end of the magnetic control switch circuit, and the magnetic control switch is used to cut off or conduct the power supply of the external AC charge battery pack; The first output end of the control switch circuit is connected to the input end of the AC/DC integrated conversion circuit, and the second output end of the magnetic control switch circuit is connected to the first input end of the battery charge and discharge management circuit; the output end of the AC/DC integrated conversion circuit is connected to the DC/DC The input end of the DC conversion circuit, the output end of the DC/DC conversion circuit is connected to the second input end of the battery charge and discharge management circuit; the output end of the battery charge and discharge management circuit is also connected to the input end of the DC/DC conversion circuit, the battery charge The discharge management circuit is used for charge and discharge management of the battery pack; the output end of the DC/DC conversion circuit is connected to the input end of the intrinsically safe circuit, and the output end of the intrinsically safe circuit is used to supply power to the load.

Charge the DC power battery pack when the AC power supply is normal. When the AC power supply cannot be supplied normally, the DC power battery pack can provide uninterrupted power supply to ensure the normal operation.

Preferably, the magnetic control switch circuit has three magnetic control switches, two of which are installed at the input end of the AC/DC integrated conversion circuit, and the other is installed at the input end of the battery pack interface and the output end of the battery charge and discharge management circuit.

Preferably, the intrinsically safe circuit includes a double overvoltage protection circuit, a double overcurrent protection circuit, and a double short circuit protection circuit, so as to limit voltage and current output energy within a safe range. The energy to realize the limited voltage and current output is within the safe range, so as to ensure that the electric sparks and thermal effects generated in the normal operation of the equipment or in the event of a short circuit or component damage in the circuit will not cause the explosion of dangerous gases that may exist around. meet intrinsic safety requirements.

Preferably, the battery pack is composed of 15 3Ah Ni-MH batteries connected in series, and the battery pack is installed on the support plate in a manner of laying 5 batteries in 3 rows. The output voltage is +15VDC～+22.5VDC, and the cut-off voltage is +15VDC, which makes the size of the battery pack and the printed board similar, and can be installed on the same support board up and down, reducing the volume.

Preferably, an observation window is also included, and the observation window is mounted on the cover plate. It is convenient for staff to observe the internal working conditions of the small flameproof and intrinsically safe uninterruptible power supply.

By integrating the AC/DC integrated conversion circuit, battery pack charge and discharge management circuit, DC/DC conversion circuit, and intrinsically safe circuit on one printed board, the printed board and battery pack are mounted on a bracket board to form an integrated installation In the flameproof shell, the flameproof and intrinsically safe uninterruptible power supply has the characteristics of simple system structure, easy assembly, small size and light weight, and has obvious market competitive advantages. It can be widely used in underground communication systems and monitoring and monitoring systems, and has good application prospects.

Additional aspects and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Description of drawings

The above-mentioned and/or additional aspects and advantages of the present utility model will become apparent and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:

Fig. 1 is the intrinsically safe circuit diagram of the utility model;

Fig. 2 is a block diagram of the utility model;

Figure 3 is a schematic block diagram of the battery charge and discharge management circuit;

Fig. 4 is a structural schematic diagram of the utility model.

Reference signs: 1 bracket plate, 2 casing, 3 printed board, 4 battery pack, 5 magnetic switch, 6 bell mouth, 7 cover plate, 8 observation window.

Detailed ways

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present utility model, but should not be construed as limiting the present utility model.

In the description of the present utility model, unless otherwise stipulated and limited, it should be noted that the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, or it can be The internal communication between two elements may be direct connection or indirect connection through an intermediary. Those of ordinary skill in the art can understand the specific meanings of the above terms according to specific situations.

The intrinsically safe circuit shown in Figure 1 includes one or any combination of an overvoltage protection circuit, an overcurrent protection circuit, and a short circuit protection circuit. The number of overvoltage protection circuits is m, and the number of overcurrent protection circuits is n. There are p circuits, and the m, n, and p are respectively positive integers;

The overvoltage protection circuit includes: the voltage input terminal VIN is connected to the input terminal of the resistor divider, the output terminal of the resistor divider and the output terminal of the reference source respectively input the signals into the first comparator U1, and the first comparator U1 collects the voltage of the resistor divider The input voltage of the first comparator U1 is compared with the reference source voltage, the output terminal of the first comparator U1 is connected to the cathode of the first diode D1, the anode of the first diode D1 is connected to the input terminal of the trigger, and the output terminal of the trigger is connected to the gate of the triode Q1, The source of the transistor Q1 is connected to the voltage input terminal VIN, and the drain of the transistor Q1 is connected to the voltage output terminal VOUT;

The overcurrent protection circuit includes: the positive pole of the load is connected to the voltage output terminal VOUT, the negative pole of the load is connected to the ground through the sampling resistor Rs, the positive pole of the sampling resistor Rs is connected to the input terminal of the amplifier, and the output terminal of the amplifier and the output terminal of the reference source respectively input signals into the second comparator U2 , the second comparator U2 compares the voltage output by the amplifier with the reference source voltage, the output terminal of the second comparator U2 is connected to the cathode of the second diode D2, and the anode of the second diode D2 is connected to the trigger input terminal to trigger The output terminal of the transistor is connected to the gate of the transistor Q1, the source of the transistor Q1 is connected to the voltage input terminal VIN, and the drain of the transistor Q1 is connected to the voltage output terminal VOUT;

The short-circuit protection circuit includes: the voltage output terminal VOUT is connected to one end of the fourth resistor R4, the other end of the fourth resistor R4 and the output terminal of the reference source respectively input signals into the third comparator U3, and the voltage output terminal VOUT is connected to the voltage by the fifth resistor R5 The input terminal VIN is connected, the positive pole of the load is connected to the voltage output terminal VOUT, the negative pole of the load is grounded through the sampling resistor Rs, the output terminal of the third comparator U3 is connected to the negative pole of the third diode D3, and the positive pole of the third diode D3 is connected to the trigger The input terminal and the trigger output terminal are connected to the gate of the transistor Q1, the source of the transistor Q1 is connected to the voltage input terminal VIN, and the drain of the transistor Q1 is connected to the voltage output terminal VOUT.

The overvoltage protection is implemented in this way. The input voltage is collected through a resistor divider and compared with the reference source voltage. When overvoltage occurs, the first comparator U1 outputs a low level, and the first diode D1 is turned on, causing the trigger The level of the device is reversed to output a high level, the transistor Q1 is turned off, and the output voltage of the voltage output terminal VOUT is zero; the overcurrent protection is to collect the voltage on the sampling resistor Rs, and compare it with the reference source voltage after passing through the amplifier; The second comparator U2 outputs a low level, and the second diode D2 is turned on, causing the flip-flop level to reverse and output a high level, the transistor Q1 is turned off, and the output voltage of the voltage output terminal VOUT is zero; the short circuit protection is achieved by collecting the voltage The output voltage of the output terminal VOUT is connected in series with a resistor R4. When short-circuited, R5 is connected in series with Rs. The output voltage of the voltage output terminal VOUT is equivalent to the voltage on Rs, which is almost zero. The output voltage of the voltage output terminal VOUT is equal to the reference source voltage Input the third comparator U3, the third comparator U3 outputs a low level, the third diode D3 is turned on, causing the trigger level to reverse and output a high level, the transistor Q1 is turned off, and the output voltage of the voltage output terminal VOUT is zero .

Here, the selection of the number of overvoltage protection circuits, overcurrent protection circuits and short circuit protection circuits can be selected according to the actual situation. From the perspective of intrinsic safety and economical application, it is preferable to use double overvoltage protection circuits and double overcurrent protection circuits. circuit and double short circuit protection circuit. When any of the three situations of overvoltage, overcurrent or short circuit occurs, the level of the flip-flop will be inverted and output a high level, the transistor Q1 will be turned off, and the output of the voltage output terminal VOUT will be zero. The characteristic of intrinsic safety of the circuit is realized from three aspects of overvoltage protection, overcurrent protection and short circuit protection.

Based on the intrinsically safe circuit, the utility model also proposes a flameproof and intrinsically safe uninterruptible power supply control system, as shown in Figure 2, including a magnetic control switch circuit, an AC/DC integrated conversion circuit, and a DC/DC conversion circuit , a battery charge and discharge management circuit, an intrinsically safe circuit, a battery pack 4, an external AC power supply connected to the first input end of the magnetic switch circuit, the battery pack 4 is bidirectionally connected to the magnetic switch circuit, and the magnetic switch circuit It is used to cut off or turn on the external alternating current and the power supply of the battery pack 4; the first output end of the magnetic control switch circuit is connected to the input end of the AC/DC integrated conversion circuit, and the magnetic control switch circuit is bidirectionally connected with the battery charge and discharge management circuit; The output end of the AC/DC integrated conversion circuit is connected to the input end of the DC/DC conversion circuit, and the output end of the AC/DC conversion circuit is connected to the input end of the battery charge and discharge management circuit; the output end of the battery charge and discharge management circuit is also connected to the DC/DC The input end of the DC conversion circuit, the battery charge and discharge management circuit is used for charge and discharge management of the battery pack 4; the output end of the DC/DC conversion circuit is connected to the input end of the intrinsically safe circuit, and the output end of the intrinsically safe circuit is used to supply power to the load .

The external AC power is input to the first input terminal of the magnetic control switch circuit through a three-core cable. When the external AC power supplies power normally, the external AC power charges the battery pack 4. At the same time, the AC/DC integrated conversion circuit converts the AC power It is converted into direct current, and then input to the input terminal of the intrinsically safe circuit through the conversion of the DC/DC conversion circuit, and finally supplies power to the load through the output terminal of the intrinsically safe circuit. If the external AC power supply cannot supply power normally, the battery pack 4 replaces the external AC power supply to supply power to the entire system to ensure normal operation. The battery charge and discharge management circuit monitors the charge and discharge conditions of the battery pack 4 to avoid overcharging or overdischarging.

Wherein, the magnetic control switch circuit has three magnetic control switches 5, wherein the first magnetic control switch is installed at the positive pole of the input end of the AC/DC integrated conversion circuit, and the second magnetic control switch is installed at the input end of the AC/DC integrated conversion circuit. The negative pole controls the on-off of the alternating current, and the third magnetically controlled switch is installed between the input end of the battery pack 4 interface and the output end of the battery charge-discharge management circuit to control the charge-discharge on-off of the battery pack.

As shown in Figure 3, the battery charging and discharging management circuit includes a battery charging module and a battery discharging module, the battery charging module is connected to the positive pole of the battery pack 4 through the third magnetic switch 5, and the third magnetic switch 5 adopts the existing The three-port magnetic switch, when powered by alternating current, provides the DC power provided by the AC/DC module to the battery pack 4 through the battery charging module for charging; the battery discharge module is also connected to the positive pole of the battery pack 4 through the third magnetic switch 5, when the battery When the battery pack 4 is discharging, the battery discharge module monitors the voltage of the battery pack 4, and when the voltage of the battery pack 4 is lower than the cut-off voltage of the battery pack 4, the battery pack 4 is turned off for discharging.

The battery charge and discharge management circuit is used to control the charging of the battery pack 4 when the AC power is supplied, and provide DC +24VDC to the battery pack 4. First, implement high-current fast charging, and then perform trickle current slow charging to prevent the battery pack 4 from overcharging; Switch to the battery pack 4 to discharge during power failure, monitor the voltage of the battery pack 4 in real time, and when it is lower than the cut-off voltage of the battery pack 4, turn off the battery pack 4 to discharge to prevent over-discharge.

The utility model also proposes a small flameproof and intrinsically safe uninterruptible power supply, as shown in Figure 4, including the flameproof and intrinsically safe uninterruptible power supply control system and the flameproof housing, the flameproof housing It includes a cover plate 7, a flameproof cavity, an input and output bell mouth 6 for introducing input and output cables, and a housing 2. A magnet for controlling a magnetic switch circuit is installed on the cover plate 7, and the flameproof cavity is from A printed board 3 and a battery pack 4 are installed from top to bottom, and the printed board 3 and the battery pack 4 are installed on the same support board 1, AC/DC integrated conversion circuit, battery charge and discharge management circuit, DC/DC conversion circuit and intrinsically safe circuits are integrated on the printed board 3 .

In this embodiment, the magnet for controlling the magnetic control switch circuit is installed on the cover plate 7. When the cover is opened, the magnetic control switch 5 cuts off the AC input and the voltage output of the battery pack 4, realizing the power off when opening the cover, and improving the Safety: AC/DC integrated conversion circuit, battery charge and discharge management circuit, DC/DC conversion circuit and intrinsically safe circuit are integrated on the printed board 3, and the printed board 3 and the battery pack 4 are also installed on the same On the bracket plate 1, the circuit integration is realized, and the printed board 3 and the battery pack 4 are integrated; this integrated installation method makes full use of the explosion-proof cavity, which reduces the volume of the flame-proof housing and is easy to assemble. The input and output bell mouth 6 adopts the way of direct wire-in to lead the input and output cables, and the inlet of the input bell mouth 6 for alternating current input and the output bell mouth 6 are the output ports of intrinsically safe voltage and current.

Among them, the flameproof surface parameter of the flameproof shell is the flameproof surface L = 25l = 12.7iC = 0.2, which can make the spark inside the flameproof shell cool down and extinguish the flame through the flameproof surface when the flame is ignited and exploded, and no spark can be transmitted to cause an external explosion. Meet explosion-proof requirements. In addition, the flameproof shell also includes a bottom plate, and the shell 2, the cover plate 7, and the bottom plate are all formed by welding 5mm steel plates made of Q235.

The flameproof and intrinsically safe uninterruptible power supply control system includes a magnetically controlled switch circuit, an AC/DC integrated conversion circuit, a DC/DC conversion circuit, a battery charge and discharge management circuit, an intrinsically safe circuit, a battery pack 4, and an external AC power supply connection The first input end of the magnetic control switch circuit, the battery pack 4 is connected to the second input end of the magnetic control switch circuit, and the magnetic control switch 5 is used to cut off or conduct the power supply of the external AC charge battery pack 4; The first output end of the magnetic control switch circuit is connected to the input end of the AC/DC integrated conversion circuit, and the second output end of the magnetic control switch circuit is connected to the first input end of the battery charge and discharge management circuit; the output end of the AC/DC integrated conversion circuit is connected to the DC The input end of the /DC conversion circuit, the output end of the DC/DC conversion circuit is connected to the second input end of the battery charge and discharge management circuit; the output end of the battery charge and discharge management circuit is also connected to the input end of the DC/DC conversion circuit, and the battery The charge and discharge management circuit is used for charge and discharge management of the battery pack 4; the output end of the DC/DC conversion circuit is connected to the input end of the intrinsically safe circuit, and the output end of the intrinsically safe circuit is used to supply power to the load.

When the AC power is normally supplied, the DC power battery pack 4 is charged, and when the AC power cannot be supplied normally, the DC power battery pack 4 can provide uninterrupted power supply to ensure normal operation.

The magnetic control switch circuit has three magnetic control switches 5, two of which are installed at the input end of the AC/DC integrated conversion circuit, and the other is installed at the input end of the interface of the battery pack 4 and the output end of the battery charge and discharge management circuit.

In this embodiment, the intrinsically safe circuit includes a double overvoltage protection circuit, a double overcurrent protection circuit, and a double short circuit protection circuit, so as to limit voltage and current output energy within a safe range. The energy to realize the limited voltage and current output is within the safe range, so as to ensure that the electric sparks and thermal effects generated in the normal operation of the equipment or in the event of a short circuit or component damage in the circuit will not cause the explosion of dangerous gases that may exist around. meet intrinsic safety requirements.

The battery pack 4 is composed of 15 3Ah Ni-MH batteries connected in series, and the battery pack 4 is installed on the support plate 1 in a way of laying 5 batteries in 3 rows. The output voltage is +15VDC～+22.5VDC, and the cut-off voltage is +15VDC, so that the size of the battery pack 4 is similar to that of the printed board 3, and can be installed on the same support board 1 up and down, reducing the volume.

It also includes an observation window 8, which is installed on the cover plate 7, which can facilitate the staff to observe the internal working conditions of the small flameproof and intrinsically safe uninterruptible power supply.

The utility model integrates the AC/DC integrated conversion circuit, the battery charge and discharge management circuit, the DC/DC conversion circuit and the intrinsically safe circuit on a printed board 3, and the printed board 3 and the battery pack 4 are installed on a support board 1 On the other hand, it forms an integrated installation in the flameproof shell, which makes the flameproof and intrinsically safe uninterruptible power supply have the characteristics of simple system structure, easy assembly, small size and light weight, and has obvious market competitive advantages. It can be widely used in underground communication systems and monitoring and monitoring systems, and has good application prospects.

In the description of this specification, reference to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" means that specific features described in connection with the embodiment or example , structures, materials or features are included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes, modifications, substitutions and modifications, the scope of the present invention is defined by the claims and their equivalents.

Claims (10)

1. an intrinsically safe circuit, it is characterized in that, comprise overvoltage crowbar, one of current foldback circuit and short-circuit protection circuit or combination in any, described overvoltage crowbar is that m is individual, current foldback circuit is n, short-circuit protection circuit is p, and described m, n, p are respectively positive integer;

Overvoltage crowbar comprises: voltage input end (VIN) contact resistance voltage divider inputs, signal is inputted the first comparator (U1) by resitstance voltage divider output and a reference source output respectively, the input voltage that resitstance voltage divider gathers by the first comparator (U1) and a reference source voltage compare, the output of the first comparator (U1) connects the negative pole of the first diode (D1), the positive pole of the first diode (D1) connects flipflop input terminal, the grid of flip-flop output connecting triode (Q1), the source electrode of triode (Q1) connects voltage input end (VIN), the drain electrode of triode (Q1) connects voltage output end (VOUT),

Current foldback circuit comprises: load positive pole connects voltage output end (VOUT), load negative pole is by sampling resistor (Rs) ground connection, the positive pole of sampling resistor (Rs) is connected with amplifier in, signal is inputted the second comparator (U2) by amplifier out and a reference source output respectively, the voltage that amplifier exports by the second comparator (U2) and a reference source voltage compare, the output of the second comparator (U2) connects the negative pole of the second diode (D2), the positive pole of the second diode (D2) connects flipflop input terminal, the grid of flip-flop output connecting triode (Q1), the source electrode of triode (Q1) connects voltage input end (VIN), the drain electrode of triode (Q1) connects voltage output end (VOUT),

Short-circuit protection circuit comprises: voltage output end (VOUT) connects one end of the 4th resistance (R4), signal is inputted the 3rd comparator (U3) by the other end of the 4th resistance (R4) and a reference source output respectively, voltage output end (VOUT) is connected with voltage input end (VIN) by the 5th resistance (R5), load positive pole connects voltage output end (VOUT), load negative pole is by sampling resistor (Rs) ground connection, the output of the 3rd comparator (U3) connects the negative pole of the 3rd diode (D3), the positive pole of the 3rd diode (D3) connects flipflop input terminal, the grid of flip-flop output connecting triode (Q1), the source electrode of triode (Q1) connects voltage input end (VIN), the drain electrode of triode (Q1) connects voltage output end (VOUT).

2. one kind utilizes the explosion-suppression and intrinsic safety uninterrupted power supply control system of intrinsically safe circuit described in claim 1, it is characterized in that, comprise magnetic switch circuit, AC/DC integrated converting circuit, DC/DC change-over circuit, battery charging and discharging management circuit, intrinsically safe circuit, battery pack

External ac power source connects the first input end of described magnetic switch circuit, and described battery pack and magnetic switch circuit are bi-directionally connected, and described magnetic switch circuit is for cutting off or conducting external communication electricity and the power supply of battery pack;

Described magnetic switch circuit first output connects AC/DC integrated converting circuit input, and magnetic switch circuit and battery charging and discharging management circuit are bi-directionally connected; Described AC/DC integrated converting circuit output is connected to DC/DC change-over circuit input, and AC/DC change-over circuit output is connected to the input of battery charging and discharging management circuit; Described battery charging and discharging management circuit output is also connected to DC/DC change-over circuit input, and described battery charging and discharging management circuit is used for the management of charging and discharging of battery pack; Described DC/DC change-over circuit output is connected to intrinsically safe circuit input, and intrinsically safe circuit output is used for powering to the load.

3. explosion-suppression and intrinsic safety uninterrupted power supply control system according to claim 2, it is characterized in that, described magnetic switch circuit has three magnetic switchs, wherein the first magnetic switch is arranged on the positive pole of the input of AC/DC integrated converting circuit, second magnetic switch is arranged on the negative pole of the input of AC/DC integrated converting circuit, control alternating current break-make, 3rd magnetic switch is arranged between the output of battery pack interface input and battery charging and discharging management circuit, controls the discharge and recharge break-make of battery pack.

4. explosion-suppression and intrinsic safety uninterrupted power supply control system according to claim 3, it is characterized in that, described battery charging and discharging management circuit comprises battery charging module and battery discharge module, battery charging module is connected with battery anode by the 3rd magnetic switch, when AC-powered, by battery charging module, the direct current that AC/DC module provides is supplied to batteries charging;

Battery discharge module is also connected with battery anode by the 3rd magnetic switch, when battery power discharge, and the voltage of battery discharge module monitors battery pack, during cut-ff voltage lower than battery pack, shutoff battery power discharge.

5. small flame-proof is held concurrently an intrinsic safety uninterrupted power supply, it is characterized in that, comprises explosion-suppression and intrinsic safety uninterrupted power supply control system according to claim 2 and explosion-proof casing,

Described explosion-proof casing comprise cover plate, flame proof cavity, for introducing input and output horn mouth and the housing of I/O cable, described cover plate is provided with the magnet controlling magnetic switch circuit, described flame proof cavity is provided with printed board and battery pack from top to bottom, described printed board and battery pack are arranged on same supporting plate, and AC/DC integrated converting circuit, battery set charge/discharge management circuit, DC/DC change-over circuit and intrinsically safe circuit are integrated in described printed board.

6. small flame-proof according to claim 5 is held concurrently intrinsic safety uninterrupted power supply, it is characterized in that, described explosion-suppression and intrinsic safety uninterrupted power supply control system comprises magnetic switch circuit, AC/DC integrated converting circuit, DC/DC change-over circuit, battery charging and discharging management circuit, intrinsically safe circuit, battery pack

External ac power source connects the first input end of described magnetic switch circuit, and described battery pack connects the second input of magnetic switch circuit, and described magnetic switch is for cutting off or the power supply of conducting external communication electric charge battery pack;

Described magnetic switch circuit first output connects AC/DC integrated converting circuit input, and magnetic switch circuit second output connects battery charging and discharging management circuit first input end; Described AC/DC integrated converting circuit output is connected to DC/DC change-over circuit input, and DC/DC change-over circuit output is connected to the second input of battery charging and discharging management circuit; Described battery charging and discharging management circuit output is also connected to DC/DC change-over circuit input, and described battery charging and discharging management circuit is used for the management of charging and discharging of battery pack; Described DC/DC change-over circuit output is connected to intrinsically safe circuit input, and intrinsically safe circuit output is used for powering to the load.

7. small flame-proof according to claim 5 is held concurrently intrinsic safety uninterrupted power supply, it is characterized in that, described magnetic switch circuit has three magnetic switchs, wherein two are arranged on the input of AC/DC integrated converting circuit, and another is arranged on the output of battery pack interface input and battery charging and discharging management circuit.

8. small flame-proof according to claim 5 is held concurrently intrinsic safety uninterrupted power supply; it is characterized in that; described intrinsically safe circuit comprises dual overvoltage crowbar, double overcurrent protection circuit, Double short protective circuit, realize deboost, electric current export energy in safe range.

9. this peace uninterrupted power supply of holding concurrently of small flame-proof according to claim 5, it is characterized in that, described battery pack is in series by the Ni-MH battery of 15 joint 3Ah, and battery pack adopts 3 row's 5 batteries flat manner to be arranged on supporting plate.

10. this peace uninterrupted power supply of holding concurrently of small flame-proof according to claim 5, it is characterized in that, also comprise observation window, described observation window is arranged on described cover plate.