CN215222375U - Low-power consumption intrinsically safe Namur wireless adapter - Google Patents

Abstract

The utility model belongs to be applied to industry field's wireless sensing equipment, a low-power consumption ann's type Namur wireless adapter specifically says so, include: the battery module comprises a core board, a battery module and an antenna, wherein the battery module and the antenna are respectively connected with the core board; the core board includes: WIA wireless module and electric quantity acquisition circuit, power supply circuit, tongue tube, Namur warning circuit, the Namur acquisition circuit rather than being connected respectively, Namur acquisition circuit passes through the safety barrier circuit and links to each other with outside Namur sensor, the antenna links to each other with WIA wireless module, battery module links to each other with electric quantity acquisition circuit and power supply circuit in nuclear core plate respectively. The utility model discloses use WIA-PA wireless module as the core, whole application low-power consumption design, essence safety design technique to adopt the power supply of large capacity safety type group battery, have low voltage protection, overcurrent protection function has both guaranteed the life of battery and has improved explosion-proof security again.

Description

Low-power consumption intrinsically safe Namur wireless adapter

Technical Field

The utility model belongs to be applied to industry field's wireless sensing equipment, specifically say so a safe type low-power consumption Namur adapter of essence based on WIA-PA industry wireless network.

Background

The proximity switch sensor of the Namur interface is widely applied in the industrial field, and the most typical application is that the proximity switch sensor is connected with a safety grid to realize wired transmission of Namur signals. However, many application scenes often face the problems of difficult wired construction, high construction cost and the like. If a wireless transmission scheme is adopted, the Namur sensor is powered, low power consumption is realized, and the service life of the battery which is more than 2 years is a design difficulty.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a safe type low-power consumption Namur adapter of essence based on WIA-PA industry wireless network. The WIA-PA wireless module is used as a core and can be connected with a sensor of a Namur interface to supply power to the sensor and acquire state information, the low-power-consumption design and the intrinsic safety design technology are integrally applied, a high-capacity safety battery pack is used for supplying power, the low-voltage protection and overcurrent protection functions are achieved, the service life of the battery is guaranteed, and the explosion-proof safety is improved.

The utility model discloses a realize that the technical scheme that above-mentioned purpose adopted is:

a low power intrinsically safe Namur wireless adapter, comprising: the battery module comprises a core board, a battery module and an antenna, wherein the battery module and the antenna are respectively connected with the core board;

the core board includes: WIA wireless module and electric quantity acquisition circuit, power supply circuit, tongue tube, Namur warning circuit, the Namur acquisition circuit rather than being connected respectively, Namur acquisition circuit passes through the safety barrier circuit and links to each other with outside Namur sensor, the antenna links to each other with WIA wireless module, battery module links to each other with electric quantity acquisition circuit and power supply circuit in nuclear core plate respectively.

The battery module comprises a battery pack, a battery protection board and an electric quantity test interface which are sequentially connected, and the battery protection board is also respectively connected with an electric quantity acquisition circuit and a power supply circuit in the core board.

The power supply circuit comprises a DC/DC conversion circuit and an LDO circuit which are sequentially connected, the DC/DC conversion circuit is connected with a battery protection board in the battery module, and the LDO circuit is connected with the WIA wireless module.

The antenna is a whip antenna.

The WIA wireless module includes: the wireless radio frequency chip is respectively connected with the electric quantity acquisition circuit, the power circuit, the reed pipe, the Namur alarm circuit and the Namur acquisition circuit, and the radio frequency amplification circuit is connected with the antenna.

The electric quantity acquisition circuit comprises a switch chip, a sampling resistor, a follower and a filter which are sequentially connected, wherein the switch chip is connected with a battery protection plate in the battery module, and the filter is connected with a wireless radio frequency module in the WIA wireless module.

The safety barrier circuit is a Zener type safety barrier circuit.

The Zener type safety gate circuit comprises a current-limiting resistor R20, a fuse F1, a capacitor C35 and three Zener diodes D5, D6 and D7, wherein:

the positive output end of the Namur acquisition circuit is connected with the positive electrode of the external Namur sensor sequentially through a fuse F1 and a current-limiting resistor R20, the negative output end of the Namur acquisition circuit is connected with the negative electrode of the external Namur sensor through a capacitor C35, a node between the fuse F1 and the current-limiting resistor R20 is connected with the negative electrode of the external Namur sensor through Zener diodes D5, D6 and D7, and the negative electrode of the external Namur sensor is grounded.

The core plate and the battery module are arranged in the metal shell.

The metal shell is an aluminum alloy shell.

The utility model has the following beneficial effects and advantages:

1. the utility model discloses wireless Namur adapter can be connected with Namur sensor, can accomplish the power supply of sensor, signal acquisition to have external sensor short circuit and report an emergency and ask for help or increased vigilance, the function is reported an emergency and asked for help or increased vigilance to the broken string.

2. The utility model discloses wireless Namur adapter adopts the low-power consumption design, and the group battery power supply can reach more than 3 years.

3. The utility model discloses wireless Namur adapter adopts this ampere of design, and explosion-proof level Ex ib IIC T3.

Drawings

FIG. 1 is a schematic block diagram of a WIA-PA wireless Namur adapter;

FIG. 2 is a DC/DC conversion circuit diagram;

FIG. 3 is a circuit diagram of the LDO power supply;

FIG. 4 is a WIA-PA wireless module circuit diagram;

FIG. 5 is a schematic diagram of a fail-safe gate circuit;

FIG. 6 is a Namur signal acquisition circuit diagram;

FIG. 7 is a circuit diagram of a Namur sensor disconnection warning circuit;

FIG. 8 is a short circuit alarm circuit diagram of the Namur sensor;

fig. 9 is a circuit diagram of power collection.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

The utility model discloses a wireless low-power consumption Namur adapter has Namur interface, through this ampere of authentication, and low power dissipation, can use battery powered.

An intrinsically safe low-power consumption Namur adapter based on a WIA-PA industrial wireless network comprises a battery pack, a wireless core board, a small whip antenna and an aluminum alloy shell.

The wireless core board adopts the intrinsic safety design technology and the explosion-proof level Ex ib IIC T3.

The wireless core board comprises a DC/DC conversion circuit, an LDO power supply circuit, a WIA-PA wireless module, an electric quantity acquisition circuit and a Namur interface circuit.

The DC/DC conversion circuit converts 7.2VDC voltage output by the battery pack into 3.3VDC direct-current voltage, has high conversion efficiency, can provide low ripple direct-current signals, and has the functions of reverse connection protection and overvoltage protection;

the LDO power supply circuit converts 3.3VDC voltage into 3.0VDC voltage, further reduces power supply ripple to be lower than 50mV, reduces interference on radio frequency signals, and has output overvoltage protection.

The WIA-PA wireless module is composed of a wireless radio frequency chip and a radio frequency amplification circuit, mainly completes the modulation and demodulation and radio frequency amplification receiving functions of digital signals, converts the digital signals into radio frequency signals of 2.4 GHz-2.4835 GHz, radiates the radio frequency signals to the space through an antenna, receives weak radio frequency signals in the space at the same time, and demodulates the weak radio frequency signals into the digital signals.

The electric quantity acquisition circuit can acquire the voltage of the battery and consists of a switch chip, a sampling resistor, a follower and a filter.

The Namur interface circuit realizes the power supply of an external Namur sensor and the signal acquisition. The low-voltage power supply and the safety grid design are adopted.

As shown in figure 1 is a schematic block diagram of a WIA-PA wireless Namur adapter,

the hardware part comprises core plate, battery module and antenna, can connect external Namur sensor.

The core board is composed of a power supply circuit, an electric quantity acquisition circuit, a Namur alarm circuit, a safety barrier circuit and the like.

The power supply circuit comprises a DC/DC conversion circuit and an LDO circuit. As shown in fig. 2, the DC/DC conversion circuit converts a voltage of 7.2V supplied from the battery pack into 3.3V. As shown in fig. 3, the LDO circuit converts 3.3V into 3.0V to supply power to the WIA wireless module, and the LDO circuit can further optimize ripple and noise, which is beneficial to improving the radio frequency performance of wireless communication, as shown in fig. 4.

The safety barrier circuit is a Zener safety barrier circuit, and the 1 pin and the 2 pin of the J9 are externally connected with a two-wire system Namur sensor. The safety gate circuit consists of a current limiting resistor, 3 zener diodes, a one-time fuse, and requires a potting process, as shown in fig. 5. The resistance and power of the current-limiting resistor, the Zener voltage of the diode and the over-current protection value of the fuse are calculated according to intrinsic safety parameters of an external sensor.

The Namur signal acquisition circuit is composed of a sampling resistor, an operational amplifier, a voltage reference, and the like, as shown in fig. 6. The sampling circuit converts the current signal of the sensor into a voltage signal. The voltage reference circuit and the operational amplifier circuit realize the judgment of the magnitude grade of the signal current of the sensor, thereby realizing the acquisition of Namur signals.

And a Namur sensor disconnection warning circuit as shown in figure 7. A Namur sensor short alarm circuit as shown in fig. 8. The circuit consists of an operational amplifier, a voltage reference circuit and the like. And determining different voltage reference circuit judgment threshold values according to the level generated by the broken line and the short circuit state of the Namur sensor, thereby realizing the corresponding alarm function.

The electric quantity acquisition circuit monitors the electric quantity of the battery, and as shown in fig. 9, when the electric quantity is too low, an alarm is given out to remind an operator to replace the battery. According to the discharge characteristics of the battery, the lower the voltage, the lower the amount of electricity, so the battery voltage can be monitored.

The circuit consists of a load switch TPS27082, a sampling resistor, a follower TLV2761 and a filter. By adopting a low-power-consumption design concept, the follower TLV2761 supplies power by using the wireless module I/0 and can control the power supply. The electric quantity acquisition input end is connected with a load switch TPS27082 in series, and the input signal can be controlled to be turned off. When collecting the electric quantity, supplying power to the partial circuit; normally, the circuit is in an off state and leaks current uA level.

Claims (10)

1. A low-power intrinsically safe Namur wireless adapter, comprising: the battery module comprises a core board, a battery module and an antenna, wherein the battery module and the antenna are respectively connected with the core board;

the core board includes: WIA wireless module and electric quantity acquisition circuit, power supply circuit, tongue tube, Namur warning circuit, the Namur acquisition circuit rather than being connected respectively, Namur acquisition circuit passes through the safety barrier circuit and links to each other with outside Namur sensor, the antenna links to each other with WIA wireless module, battery module links to each other with electric quantity acquisition circuit and power supply circuit in nuclear core plate respectively.

2. The Namur wireless adapter of claim 1, wherein the battery module comprises a battery pack, a battery protection board and a power testing interface, wherein the battery protection board is connected to the power collecting circuit and the power circuit of the core board.

3. The Namur wireless adapter of claim 1, wherein the power circuit comprises a DC/DC converter circuit and an LDO circuit connected in series, the DC/DC converter circuit connected to a battery protection board of the battery module, the LDO circuit connected to the WIA wireless module.

4. The low power intrinsically safe Namur wireless adapter of claim 1, wherein the antenna is a whip antenna.

5. The low power intrinsically safe Namur wireless adapter of claim 1, wherein the WIA wireless module comprises: the wireless radio frequency chip is respectively connected with the electric quantity acquisition circuit, the power circuit, the reed pipe, the Namur alarm circuit and the Namur acquisition circuit, and the radio frequency amplification circuit is connected with the antenna.

6. The Namur wireless adapter of claim 1, wherein the power acquisition circuit comprises a switch chip, a sampling resistor, a follower and a filter, which are connected in sequence, the switch chip is connected to a battery protection board of the battery module, and the filter is connected to a radio frequency module of the WIA wireless module.

7. A low power intrinsically safe Namur wireless adapter as recited in claim 1, wherein the safing barrier circuit is a zener-type safing barrier circuit.

8. The low power intrinsically safe Namur wireless adapter of claim 7, wherein the Zener safety barrier circuit comprises a current limiting resistor R20, a fuse F1, a capacitor C35, and three Zener diodes D5, D6, D7, wherein:

the positive output end of the Namur acquisition circuit is connected with the positive electrode of the external Namur sensor sequentially through a fuse F1 and a current-limiting resistor R20, the negative output end of the Namur acquisition circuit is connected with the negative electrode of the external Namur sensor through a capacitor C35, a node between the fuse F1 and the current-limiting resistor R20 is connected with the negative electrode of the external Namur sensor through Zener diodes D5, D6 and D7, and the negative electrode of the external Namur sensor is grounded.

9. The low power intrinsically safe Namur wireless adapter as recited in claim 1, wherein the core board and the battery module are disposed within a metal housing.

10. The low power intrinsically safe Namur wireless adapter of claim 9, wherein the metal housing is an aluminum alloy housing.

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