Two-wire current output built-in wireless data transmission instrument

Abstract

The utility model discloses a kind of two-wire system current type output built-in wireless data sending instrument, including (4~20)mA power taking circuit, battery charging circuit, wireless transceiver system, current pressure transmitter and current detection module.(4~20)mA power taking circuit is connected with battery charging circuit, current pressure transmitter, and 24V power supply is jointly accessed to form series loop;Battery charging circuit is powered for wireless transceiver system;Current detection module is connected in series in power supply loop and with wireless transceiver system connection.Wireless transceiver system contains MCU and 4G module, and can hibernate wake-up to realize data sending.The instrument does not need to change original line, can utilize sustained current charging, realize long-term maintenance-free wireless monitoring, and be applicable to industrial remote monitoring scene.

Claims

1. A two-wire current-type output instrument with built-in wireless data transmission, characterized in that, It includes a power supply circuit, a battery charging circuit, a wireless transceiver system, and a current and pressure transmitter; the output terminal of the power supply circuit is connected to the input terminal of the battery charging circuit, the output terminal of the battery charging circuit is connected to the wireless transceiver system, and the power supply circuit is also connected to the current and pressure transmitter. The power supply circuit and the current and pressure transmitter are both connected to the positive and negative terminals of a 24V power supply to form a series circuit.

2. The two-wire current-type output built-in wireless data transmission instrument according to claim 1, characterized in that, The battery charging circuit includes a charging IC, a first LED indicator, a second LED indicator, multiple resistors, and multiple capacitors. The voltage input terminal of the charging IC is connected to the positive terminal of a 24V power supply. The charging output terminal of the charging IC is connected to one end of each of the multiple capacitors and a wireless transceiver system. The other ends of the multiple capacitors are all grounded. The first LED indicator is connected to the charging status indicator terminal of the charging IC through a resistor. The second LED indicator is connected to the fully charged status indicator terminal of the charging IC through another resistor. The other ends of both the first and second LED indicators are grounded.

3. The two-wire current-type output built-in wireless data transmission instrument according to claim 1, characterized in that, It also includes a current detection module, which is connected in series in the 24V power supply circuit, and the input terminal of the current detection module is connected to the power supply circuit, and the output terminal of the current detection module is connected to the wireless transceiver system.

4. The two-wire current-type output built-in wireless data transmission instrument according to claim 1, characterized in that, The wireless transceiver system includes an MCU and a 4G module; the power input terminal of the MCU is connected to the output terminal of the battery charging circuit, the control output terminal of the MCU is connected to the control input terminal of the 4G module, and the power input terminal of the 4G module is connected to the output terminal of the battery charging circuit.

5. The two-wire current-type output built-in wireless data transmission instrument according to claim 1, characterized in that, The current-pressure transmitter includes a conditioning IC, a transistor, multiple resistors, and multiple capacitors. The voltage detection terminal of the conditioning IC is connected to one end of a resistor, and the other end of the resistor is grounded. The output terminal of the conditioning IC is connected to the control terminal of the transistor. The input terminal of the transistor is connected to the positive terminal of the 24V power supply, and the output terminal of the transistor is connected to the negative terminal of the 24V power supply. Multiple capacitors are connected in parallel between different pins of the conditioning IC and ground.

6. The two-wire current-type output built-in wireless data transmission instrument according to claim 3, characterized in that, The current detection module includes a detection resistor, an operational amplifier, and an ADC chip. The detection resistor is connected in series in a 24V power supply circuit, and its two ends are respectively connected to the two input terminals of the operational amplifier. The output terminal of the operational amplifier is connected to the input terminal of the ADC chip, and the output terminal of the ADC chip is connected to the MCU in the wireless transceiver system. The power supply terminal of the ADC chip is connected to the power supply voltage.

7. The two-wire current-type output built-in wireless data transmission instrument according to claim 2, characterized in that, The temperature detection terminal of the charging IC is grounded through a resistor. A resistor is connected in series between the voltage input terminal of the charging IC and the positive terminal of the 24V power supply. The ground terminal of the charging IC is connected to the system ground.

8. The two-wire current-type output built-in wireless data transmission instrument according to claim 4, characterized in that, The MCU has an internal RTC component, the output of which is connected to the wake-up input of the MCU, and the wake-up output of the MCU is connected to the wake-up input of the 4G module.

9. The two-wire current-type output built-in wireless data transmission instrument according to claim 5, characterized in that, The feedback terminal of the conditioning IC is connected to one end of the detection resistor, the power supply terminal of the conditioning IC is connected to the power supply voltage, and a capacitor is connected in parallel between the power supply terminal and ground.

10. The two-wire current-type output built-in wireless data transmission instrument according to claim 1, characterized in that, The power supply circuit, battery charging circuit, wireless transceiver system, and current and pressure transmitter share the same grounding terminal, which is connected to the negative terminal of the 24V power supply.

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