CN213455904U - Low-voltage line wireless passive current temperature fire detector - Google Patents
Low-voltage line wireless passive current temperature fire detector Download PDFInfo
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- CN213455904U CN213455904U CN202022442648.8U CN202022442648U CN213455904U CN 213455904 U CN213455904 U CN 213455904U CN 202022442648 U CN202022442648 U CN 202022442648U CN 213455904 U CN213455904 U CN 213455904U
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Abstract
The utility model provides a wireless passive current temperature fire detector of low voltage circuit, including current transformer, rectification filter module, partial pressure module, AD conversion module, DC/DC voltage reduction module, temperature sensor and wireless communication control module. The utility model discloses a power supply of each module is derived from the low voltage line is answered in current transformer, has realized passive power supply, and the electric current of collection and temperature data transmit through wireless communication control module, have realized wireless transmission, and fire detector uses more conveniently.
Description
Technical Field
The utility model relates to a fire detection technical field especially relates to a wireless passive current temperature fire detector of low voltage circuit.
Background
Fire detection is usually carried out on a low-voltage circuit in a low-voltage switch cabinet in a current detection or temperature detection mode, and if a fire is easily caused by overlarge current or overhigh temperature in the circuit, an alarm can be given when the overlarge current or the overhigh temperature is detected so as to realize fire detection. The traditional current temperature fire detector mostly adopts an active power supply and wired transmission mode, and the active power supply and the wired transmission both cause the fire detector to be inconvenient to use.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a wireless passive electric current temperature fire detector of low voltage circuit to solve traditional low voltage circuit fire detector and adopt active power supply and wired transmission to lead to the detector awkward problem.
The technical scheme of the utility model is realized like this: a low-voltage line wireless passive current temperature fire detector comprises a current transformer, a rectifying and filtering module, a voltage division module, an AD conversion module, a DC/DC voltage reduction module, a temperature sensor and a wireless communication control module;
the current transformer is arranged in a low-voltage line, and a secondary side winding of the current transformer is connected with the input end of the rectification filter module;
the output end of the rectification filtering module is connected with the wireless communication control module through the voltage division module and the AD conversion module in sequence;
the output end of the rectification filtering module is also respectively connected with the power supply end of the temperature sensor and the power supply end of the wireless communication control module through the DC/DC voltage reduction module, and the output end of the temperature sensor is connected with the wireless communication control module.
Optionally, the voltage dividing module is a voltage dividing circuit formed by a plurality of resistors.
Optionally, the DC/DC voltage reduction module includes a MAX5030B chip, resistors R1 to R2, a diode D1, and an inductor L1;
the output end of the rectification filter module is connected with a Vin pin of the MAX5030B chip, the output end of the rectification filter module is further grounded through a resistor R1 and a resistor R2 in sequence, the common end of the resistor R1 and the resistor R2 is connected with an On/Off pin of the MAX5030B chip, an LX pin of the MAX5030B chip is grounded through a cathode of a diode D1 and an anode of a diode D1 in sequence, the LX pin of the MAX5030B chip is further connected with one end of an inductor L1, and the other end of the inductor L1 is respectively connected with a power supply end of the temperature sensor, a power supply end of the wireless communication control module and an FB pin of the MAX5030B chip.
Optionally, the temperature sensor includes a DS18B20 chip, the output terminal of the DC/DC voltage reduction module is connected to pin 1 of the DS18B20 chip, and pin 2 of the DS18B20 chip is connected to the wireless communication control module.
Optionally, the wireless communication control module includes a CC2530 chip, an antenna matching circuit and an antenna, an output end of the AD conversion module is connected to an I/O pin of the CC2530 chip, an output end of the temperature sensor is connected to the I/O pin of the CC2530 chip, an output end of the DC/DC voltage reduction module is connected to a power supply pin of the CC2530 chip, and a radio frequency port of the CC2530 chip is connected to the antenna through the antenna matching circuit.
Optionally, the low-voltage line wireless passive current temperature fire detector further includes a voltage conversion circuit, the voltage conversion circuit is connected between the output end of the DC/DC voltage reduction module and the power supply end of the wireless communication control module, and the voltage conversion circuit is used for converting the output voltage of the DC/DC voltage reduction module into the power supply voltage of the wireless communication control module.
Optionally, the voltage conversion circuit includes an XC6206P332MR chip, an output terminal of the DC/DC voltage reduction module is connected to a pin 3 of the XC6206P332MR chip, and a pin 2 of the XC6206P332MR chip is connected to a power supply terminal of the wireless communication control module.
The utility model discloses a wireless passive electric current temperature fire detector of low voltage circuit has following beneficial effect for prior art:
(1) the power supply of each module is induced from a low-voltage line by a current transformer, passive power supply is realized, the acquired current and temperature data are transmitted through a wireless communication control module, wireless transmission is realized, and the fire detector is more convenient to use;
(2) the output voltage of the DC/DC voltage reduction module is converted into the voltage capable of supplying power to the wireless communication control module through the voltage conversion circuit, and the problem that the DC/DC voltage reduction module cannot directly supply power to the temperature sensor and the wireless communication control module at the same time is solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings 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 some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a block diagram of the low-voltage line wireless passive current temperature fire detector of the present invention;
FIG. 2 is a circuit diagram of the DC/DC buck module of the present invention;
fig. 3 is a circuit diagram of the temperature sensor of the present invention;
fig. 4 is a partial circuit diagram of the wireless communication control module of the present invention;
fig. 5 is a circuit diagram of the voltage conversion circuit of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to 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 all belong to the protection scope of the present invention.
As shown in fig. 1, the low-voltage line wireless passive current temperature fire detector comprises a current transformer, a rectification filtering module, a voltage division module, an AD conversion module, a DC/DC voltage reduction module, a temperature sensor and a wireless communication control module. The current transformer is arranged in a low-voltage line, and a secondary side winding of the current transformer is connected with the input end of the rectification filter module. The output end of the rectification filtering module is connected with the wireless communication control module through the voltage division module and the AD conversion module in sequence. The output end of the rectification filtering module is also respectively connected with the power supply end of the temperature sensor and the power supply end of the wireless communication control module through the DC/DC voltage reduction module, and the output end of the temperature sensor is connected with the wireless communication control module. The voltage dividing module can be a voltage dividing circuit formed by a plurality of resistors, and the type selection and circuit structure of the current transformer, the rectifying and filtering module and the AD conversion module can refer to a traditional circuit, which is not described herein again.
In the embodiment, the current transformer induces and outputs alternating current voltage from a low-voltage line, the rectifying and filtering module is used for rectifying and filtering alternating current, the voltage after rectification and output is higher, the voltage needs to be reduced by the voltage dividing module and then input into the AD conversion module, the voltage needs to be reduced by the DC/DC voltage reducing module and then supply power to the AD conversion module, the temperature sensor and the wireless communication control module, the wireless communication control module has the functions of a controller and wireless communication, sampling voltage representing sampling current obtained by the AD conversion module is input into the wireless communication control module, the controller in the wireless communication control module calculates the current in the low-voltage line through the sampling voltage to realize the function of current detection, the sampling current and the temperature of the low-voltage line obtained by the temperature sensor are wirelessly transmitted through the wireless unit in the wireless communication control module to be sent to a background, the background can alarm when the sampling current and the temperature are higher than the safety values, and the purpose of fire detection is achieved. The power supply of each module of this embodiment is derived from the low-voltage line for current transformer, has realized passive power supply like this, and the electric current of gathering and temperature data transmit through wireless communication control module, have realized wireless transmission, and fire detector uses more conveniently.
As shown in fig. 2, the DC/DC voltage reduction module of the present embodiment includes a MAX5030B chip, resistors R1-R2, a diode D1, and an inductor L1. The output end of the rectification filter module is connected with a Vin pin of the MAX5030B chip, the output end of the rectification filter module is further grounded through a resistor R1 and a resistor R2 in sequence, the common end of the resistor R1 and the resistor R2 is connected with an On/Off pin of the MAX5030B chip, an LX pin of the MAX5030B chip is grounded through a cathode of a diode D1 and an anode of a diode D1 in sequence, the LX pin of the MAX5030B chip is further connected with one end of an inductor L1, and the other end of the inductor L1 is respectively connected with a power supply end of the temperature sensor, a power supply end of the wireless communication control module and an FB pin of the MAX5030B chip.
The MAX5030B chip has a threshold voltage below which the MAX5030B chip cannot output. The threshold voltage is set by the On/Off pins, i.e., by resistors R1-R2. Inductor L1 is an output energy storage inductor, and diode D1 is a freewheeling diode. The output of the DC/DC voltage reduction module is 5V by parameter setting.
As shown in fig. 3, the temperature sensor of the present embodiment includes a DS18B20 chip, the output terminal of the DC/DC voltage reduction module is connected to pin 1 of the DS18B20 chip, and pin 2 of the DS18B20 chip is connected to the wireless communication control module. That is, the other end of the inductor L1 is the output end of the DC/DC buck module, and pin No. 2 of the DS18B20 chip is the output end of the temperature sensor. The DS18B20 chip adopts a unique single bus technology, so that interface resources are saved, and information can be read and written only by one interface line; only 3 pins are needed, so that the pins of the wireless communication control module are not excessively occupied, the size is small, and the anti-interference capability is strong; the voltage range is 3-5.5V, and programming is convenient; the power can be supplied by a single bus without an external power supply, so that the power consumption is reduced; no additional AD conversion chip is required. In the embodiment, the DC/DC voltage reduction module outputs 5V voltage to supply power to the DS18B20 chip.
As shown in fig. 4, the wireless communication control module of this embodiment includes a CC2530 chip, an antenna matching circuit and an antenna, an output terminal of the AD conversion module is connected to an I/O pin of the CC2530 chip, an output terminal of the temperature sensor is connected to an I/O pin of the CC2530 chip, an output terminal of the DC/DC voltage reduction module is connected to a power supply pin of the CC2530 chip, and a radio frequency port of the CC2530 chip is connected to the antenna through the antenna matching circuit. The antenna matching circuit is not shown, and is often a balun circuit. The CC2530 chip is an SoC solution for 2.4GHz IEEE802.15.4 ZigBee, and the established ZigBee network has the advantages of low cost, high efficiency, good performance and the like. The CC2530 chip is roughly divided into a CPU, a memory, a peripheral and a wireless radio frequency module, thereby having the radio frequency communication function and the control function. The CC2530 chip has a chip 8051 core, which is a single cycle core that can access special function registers on a single cycle. The peripheral of the CC2530 chip comprises: the device comprises a debugging interface, a flash memory controller, an I/O controller, a DMA controller, timers 1-4, a sleep timer, an analog-to-digital converter, a random number generator, an AES coprocessor, a watchdog timer, a USART and a USB 2.0 controller. The CC2530 provides a wireless radio frequency module (wireless transceiver) compatible with ieee802.15.4 standard, and the chip further provides an interface between the MCU and the wireless radio frequency module, through which the MCU can send commands to the wireless transceiver to control the wireless transceiver to perform corresponding actions.
In this embodiment, a CC2530 chip is selected to implement wireless communication, the power supply voltage of the CC2530 chip is 3.3V, and the output voltage of the DC/DC voltage reduction module is 5V, which requires voltage conversion. As shown in fig. 1, the low-voltage line wireless passive current temperature fire detector preferably further includes a voltage conversion circuit, the voltage conversion circuit is connected between the output terminal of the DC/DC voltage reduction module and the power supply terminal of the wireless communication control module, and the voltage conversion circuit is configured to convert the output voltage of the DC/DC voltage reduction module into the power supply voltage of the wireless communication control module. As shown in fig. 5, the voltage conversion circuit of this embodiment includes an XC6206P332MR chip, an output terminal of the DC/DC voltage reduction module is connected to a pin 3 of the XC6206P332MR chip, and a pin 2 of the XC6206P332MR chip is connected to a power supply terminal of the wireless communication control module. The XC6206P332MR chip is a voltage stabilizing chip with high precision and low power consumption, the highest input voltage is 6V, and the output voltage is 1.2-5V. The XC6206P332MR chip can work only by two filter capacitors, and the size of hardware is greatly reduced by adopting SOT-23 chip packaging.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A wireless passive current temperature fire detector for a low-voltage line is characterized by comprising a current transformer, a rectifying and filtering module, a voltage division module, an AD conversion module, a DC/DC voltage reduction module, a temperature sensor and a wireless communication control module;
the current transformer is arranged in a low-voltage line, and a secondary side winding of the current transformer is connected with the input end of the rectification filter module;
the output end of the rectification filtering module is connected with the wireless communication control module through the voltage division module and the AD conversion module in sequence;
the output end of the rectification filtering module is also respectively connected with the power supply end of the temperature sensor and the power supply end of the wireless communication control module through the DC/DC voltage reduction module, and the output end of the temperature sensor is connected with the wireless communication control module.
2. The low-voltage line wireless passive current temperature fire detector of claim 1, wherein the voltage divider module is a voltage divider circuit formed by a plurality of resistors.
3. The wireless passive current temperature fire detector of claim 1, wherein the DC/DC voltage reduction module comprises a MAX5030B chip, resistors R1-R2, a diode D1, and an inductor L1;
the output end of the rectification filter module is connected with a Vin pin of the MAX5030B chip, the output end of the rectification filter module is further grounded through a resistor R1 and a resistor R2 in sequence, the common end of the resistor R1 and the resistor R2 is connected with an On/Off pin of the MAX5030B chip, an LX pin of the MAX5030B chip is grounded through a cathode of a diode D1 and an anode of a diode D1 in sequence, the LX pin of the MAX5030B chip is further connected with one end of an inductor L1, and the other end of the inductor L1 is respectively connected with a power supply end of the temperature sensor, a power supply end of the wireless communication control module and an FB pin of the MAX5030B chip.
4. The low-voltage line wireless passive current temperature fire detector of claim 1, wherein the temperature sensor comprises a DS18B20 chip, the output terminal of the DC/DC voltage reduction module is connected with pin 1 of the DS18B20 chip, and pin 2 of the DS18B20 chip is connected with the wireless communication control module.
5. The fire detector of claim 1, wherein the wireless communication control module comprises a CC2530 chip, an antenna matching circuit and an antenna, an output terminal of the AD conversion module is connected to an I/O pin of the CC2530 chip, an output terminal of the temperature sensor is connected to an I/O pin of the CC2530 chip, an output terminal of the DC/DC voltage reduction module is connected to a power supply pin of the CC2530 chip, and a radio frequency port of the CC2530 chip is connected to the antenna through the antenna matching circuit.
6. The low-voltage line wireless passive current temperature fire detector of claim 1, further comprising a voltage conversion circuit, the voltage conversion circuit being connected between the output terminal of the DC/DC voltage reduction module and the power supply terminal of the wireless communication control module, the voltage conversion circuit being configured to convert the output voltage of the DC/DC voltage reduction module into the power supply voltage of the wireless communication control module.
7. The wireless passive current temperature fire detector of claim 5, wherein the voltage conversion circuit comprises XC6206P332MR chip, the output terminal of the DC/DC voltage reduction module is connected to pin 3 of XC6206P332MR chip, and pin 2 of XC6206P332MR chip is connected to the power supply terminal of the wireless communication control module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022442648.8U CN213455904U (en) | 2020-10-28 | 2020-10-28 | Low-voltage line wireless passive current temperature fire detector |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022442648.8U CN213455904U (en) | 2020-10-28 | 2020-10-28 | Low-voltage line wireless passive current temperature fire detector |
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| Publication Number | Publication Date |
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| CN213455904U true CN213455904U (en) | 2021-06-15 |
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| CN202022442648.8U Active CN213455904U (en) | 2020-10-28 | 2020-10-28 | Low-voltage line wireless passive current temperature fire detector |
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