A Wide-Range Power Supply Adaptive Intrinsically Safe Sensor Circuit

Abstract

The present invention discloses a wide-range power supply adaptive intrinsically safe sensor circuit, which includes a first connector, an intrinsically safe output power supply and a sensor probe; it further includes a constant current circuit and a voltage stabilizing circuit; the intrinsically safe output power supply, the first connector and the sensor probe are connected in sequence to supply power to the sensor probe; the constant current circuit and the voltage stabilizing circuit are connected in series and arranged between the first connector and the sensor probe, with one end connected to the first connector and the other end connected to the sensor probe, and the power supply input into the sensor probe is subjected to constant current and voltage stabilization in sequence. In the non-safe area where the intrinsically safe sensor is located, this solution combines the constant current circuit with the voltage stabilizing circuit to perform constant current and voltage stabilization on the input power supply in sequence, which can greatly improve the reliability and safety of the circuit during operation.

Description

Technical Field

[0001] The present invention relates to the field of electronic technology, and particularly to a wide-range power supply adaptive intrinsically safe sensor circuit. Background Art

[0002] With the rapid development of industries such as mining and petroleum, the use of explosion-proof devices in production and rescue is becoming more and more extensive, and the varieties and functions are also increasing. How to prevent accidental explosions in an environment full of explosive gases has become an important topic. Since electrical appliances will generate electric sparks during operation, once they come into contact with the explosive gases in the production environment, it will lead to large-scale explosion accidents, thus endangering the lives of workers and national property.

[0003] The intrinsically safe explosion-proof device is designed to prevent the electric sparks or effects generated inside the device from coming into contact with the ignitable gas in a flammable environment, so as to achieve the explosion-proof effect. Nowadays, when the existing intrinsically safe device is working, after the intrinsically safe output power protection action, it cannot be automatically restored, thus causing some accidental accidents. In order to solve the technical problems existing in the existing intrinsically safe circuit, it is necessary to develop a wide-range power supply adaptive intrinsically safe sensor circuit.

[0004] Therefore, how to improve the safety of the wide-range power supply adaptive intrinsically safe sensor circuit is a problem to be solved in this field. Summary of the Invention

[0005] Aiming at the technical problem of low safety in the circuit where the existing intrinsically safe sensor is located, the purpose of the present invention is to provide a wide-range power supply adaptive intrinsically safe sensor circuit, thereby overcoming the problems existing in the prior art.

[0006] To achieve the above purpose, the wide-range power supply adaptive intrinsically safe sensor circuit provided by the present invention includes a first connector, an intrinsically safe output power supply and a sensor probe; it also includes a constant current circuit and a voltage stabilizing circuit; the intrinsically safe output power supply, the first connector and the sensor probe are connected in sequence to supply power to the sensor probe;

[0007] The constant current circuit and the voltage stabilizing circuit are connected in series and arranged between the first connector and the sensor probe, with one end connected to the first connector and the other end connected to the sensor probe, and the power supply input into the sensor probe is subjected to constant current and voltage stabilization in sequence.

[0008] Further, the constant current circuit is composed of a constant current chip, a first capacitor and a first resistor; the constant current chip is connected in series between the first connector and the voltage stabilizing circuit; the first capacitor is connected into the circuit where the first connector and the constant current chip are located; the first resistor is connected in parallel between the constant current chip and the voltage stabilizing circuit.

[0009] Further, the voltage stabilizing circuit is composed of a voltage stabilizing chip and a second capacitor; the voltage stabilizing chip is connected in series between the constant current chip and the sensor probe; the second capacitor is connected to the circuit where the voltage stabilizing chip and the sensor probe are located.

[0010] Further, a first opto-isolation element is provided between the sensor probe and the second port of the first connector, which converts the analog signal of the sensor probe into light waves.

[0011] Further, the second port of the first connector is connected to a photosensitive diode, which converts the light waves into optical signals through the photosensitive diode.

[0012] Further, the photosensitive diode is connected to a second opto-isolation element, which converts the optical signal into light waves and outputs them.

[0013] The wide-range power supply adaptive intrinsically safe sensor circuit provided by this solution combines a constant current circuit and a voltage stabilizing circuit in the non-safe area where the intrinsically safe sensor is located, and sequentially performs constant current and voltage stabilization on the input power supply, which can greatly improve the safety and reliability of the circuit during operation. Description of the Drawings

[0014] The following further describes the present invention in conjunction with the drawings and specific embodiments.

[0015] Figure 1 It is a schematic circuit structure diagram of the intrinsically safe sensor in this circuit;

[0016] Figure 2 It is a schematic circuit structure diagram of the intrinsically safe associated element in this circuit. Detailed Embodiments

[0017] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below with reference to specific illustrations.

[0018] This solution provides a power supply adaptive intrinsically safe sensor circuit based on an intrinsically safe sensor and an intrinsically safe associated element. Among them, referring to Figure 1 - Figure 2 , the intrinsically safe sensor is arranged in the non-safe area, and the intrinsically safe associated element is arranged in the safe area.

[0019] Among them, the intrinsically safe output power supply is connected to the first connector P1 to control the switch of the first connector P1; the intrinsically safe output power supply outputs a DC power supply to the first connector P1; where P1 is the first connector; its first port is used to connect to the intrinsically safe output power supply to receive the DC power supply output by the intrinsically safe output power supply.

[0020] The first output port of the first connector P1 is sequentially connected to the first diode D1 and the second diode D2; the first diode D1 and the second diode D2 are in series, one end is connected to the first port of the first connector P1, and the other end is connected to the input end of the constant current circuit, for rectifying the power supply output by the first connector P1 and then transmitting it to the constant current circuit for constant current.

[0021] The constant current circuit is used to perform constant current on the power supply input from the first connector P1 end, and it includes a constant current chip U1, a first capacitor C1 and a first resistor R1.

[0022] Among them, the third end of the constant current chip U1 is connected to the second diode D2, and the first end is connected to the voltage stabilizing circuit; the first output end of the constant current chip U1 is connected to the input end of the voltage stabilizing circuit; for performing constant current on the current rectified by the second diode D2 and then transmitting it to the voltage stabilizing circuit for voltage stabilization.

[0023] The input end of the first capacitor C1 is connected into the circuit between the second diode D2 and the constant current chip U1, and the output end is grounded.

[0024] The first resistor R1 is connected in parallel to the circuit where the constant current chip U1 and the voltage stabilizing circuit are located, for limiting the current of this circuit; one end of the first resistor R1 is connected to the second end of the constant current chip U1, and the other end is connected into the circuit of the constant current chip U1 and the voltage stabilizing circuit.

[0025] Among them, the voltage stabilizing circuit includes a voltage stabilizing chip U2 and a second capacitor C2.

[0026] Among them, the first end input of the voltage stabilizing circuit is connected to the first end output of the constant current chip U1, for receiving the power supply after passing through the constant current chip U1 and performing voltage stabilization on it; the second output end of the voltage stabilizing chip U2 is connected to the ground; the third output end of the voltage stabilizing chip U2 is connected to the sensor probe U3 to supply power to it.

[0027] The input end of the second capacitor C2 is connected into the circuit where the voltage stabilizing chip U2 and the sensor probe U3 are located; the output end is connected to the ground.

[0028] The output end of the voltage stabilizing circuit is connected to the sensor probe U3 to supply power to the sensor probe U3.

[0029] After receiving the DC power supply, this solution passes through the constant current circuit and the voltage stabilizing circuit in sequence for constant current and voltage stabilization, and then transmits it to the sensor probe U3 for power supply. By adjusting and controlling this transmission circuit, it can be ensured that when this circuit works in a non-safe area, its safety can be further improved.

[0030] When the sensor probe U3 is working, an analog signal quantity will be output at the output end.

[0031] A signal quantity conversion circuit formed by connecting a second resistor R2, a third resistor R3, and a first opto-isolation element U4; the analog signal output by the sensor probe U3 is optically coupled through the second resistor R2, the third resistor R3, and the first opto-isolation element U4. Optical coupling will receive the signal, amplify the received signal, and drive the internal light-emitting diode to emit light of a certain wavelength.

[0032] The second port of the first connector P1 is connected to a fourth resistor R4 and a photosensitive diode D3; the photosensitive diode D3 receives the light source generated by the light-emitting diode in the first opto-isolation element U4, converts it into an optical signal, and further amplifies it to form an optical signal for output.

[0033] The output end of the photosensitive diode D3 is connected to a second opto-isolation element U5; after the photosensitive diode D3 transmits the optical signal to the second opto-isolation element U5 for opto-electronic coupling to generate a light source, it is connected to the backend controller through the second connector P2 for the transmission of the optical signal.

[0034] The following takes the intrinsically safe sensor circuit formed by the foregoing solution as an example to illustrate its operation process.

[0035] The intrinsically safe output power supply is connected to the first connector P1. The first output end of the first connector P1 sequentially transmits the current to the first diode D1 and the second diode D2 to rectify the current.

[0036] The rectified current is sequentially constant-current through a constant-current circuit and a voltage-regulating circuit, and after voltage regulation, it is transmitted to the sensor probe U3 to supply power to it.

[0037] When the sensor probe U3 is working, it outputs an analog signal to the first opto-isolation element U4. The signal is received by the first opto-isolation element U4, amplified, and then a light of a certain wavelength is generated.

[0038] The photosensitive diode D3 in the circuit located in the safe area receives the light source, amplifies it to form an optical signal and transmits it to the second opto-isolation element U5. The optical signal is received and amplified again, and then converted into a light source and output to the controller connected to the second connector P2.

[0039] In the non-safe area where the intrinsically safe sensor is located in this solution, the constant-current circuit is combined with the voltage-regulating circuit to sequentially constant-current and regulate the voltage of the input power supply, which can greatly improve the reliability and safety of the circuit during operation.

[0040] The basic principles, main features and advantages of the present invention have been shown and described above. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and what is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A wide-range power supply adaptive intrinsically safe sensor circuit, comprising a first connector (P1), an intrinsically safe output power supply and a sensor probe (U3); characterized in that, It also includes a constant current circuit and a voltage stabilizing circuit; the intrinsically safe output power supply, the first connector (P1) and the sensor probe (U3) are connected in sequence to supply power to the sensor probe (U3). The constant current circuit and the voltage stabilizing circuit are connected in series and arranged between the first connector (P1) and the sensor probe (U3), with one end connected to the first connector (P1) and the other end connected to the sensor probe (U3), to perform constant current and voltage stabilization on the power supply input into the sensor probe (U3) in sequence. A first opto-isolation element (U4) is provided between the sensor probe (U3) and the second port of the first connector (P1). The signal quantity conversion circuit formed by connecting the first opto-isolation element (U4) with the second resistor (R2) and the third resistor (R3) optically couples the analog signal output by the sensor probe (U3) through the second resistor (R2), the third resistor (R3), and the first opto-isolation element (U4). The optical coupling will receive the signal and amplify the received signal to drive the internal light-emitting diode to emit light of a certain wavelength. The second port of the first connector (P1) is connected to the fourth resistor (R4) and the photosensitive diode (D3). The photosensitive diode (D3) receives the light source generated by the light-emitting diode in the first opto-isolation element (U4) and converts it into an optical signal, which is further amplified and then output as an optical signal; the output end of the photosensitive diode (D3) is connected to the second opto-isolation element (U5); after the photosensitive diode (D1) transmits the optical signal to the second opto-isolation element (U5) for optoelectronic coupling to generate a light source, it is connected to the backend controller through the second connector (P2) for the transmission of the optical signal.

2. The wide-range power supply adaptive intrinsically safe sensor circuit according to claim 1, characterized in that, The constant current circuit is composed of a constant current chip (U1), a first capacitor (C1), and a first resistor (R1); the constant current chip (U1) is connected in series between the first connector (P1) and the voltage stabilizing circuit; the first capacitor (C1) is connected into the circuit where the first connector (P1) and the constant current chip (U1) are located; the first resistor (R1) is connected in parallel between the constant current chip (U1) and the voltage stabilizing circuit.

3. The wide-range power supply adaptive intrinsically safe sensor circuit according to claim 1, characterized in that, The voltage stabilizing circuit is composed of a voltage stabilizing chip (U2) and a second capacitor (C2); the voltage stabilizing chip (U2) is connected in series between the constant current chip (U1) and the sensor probe (U3); the second capacitor (C2) is connected into the circuit where the voltage stabilizing chip (U2) and the sensor probe (U3) are located.

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