Combustible gas controller

Abstract

The present invention discloses a combustible gas controller, including a CPU microcontroller, a crystal oscillator circuit, a pulse circuit, a clock circuit, a signal conversion circuit, a key comparison circuit and an amplifier circuit. The crystal oscillator circuit, the pulse circuit, the clock circuit, the signal conversion circuit, the key comparison circuit and the amplifier circuit are all connected to the CPU microcontroller. The crystal oscillator circuit has a crystal oscillator; the pulse circuit has a positive low-dropout voltage regulator with an output voltage of 3.3V; the clock circuit has a clock chip; the signal conversion circuit includes a voltage stabilization circuit, a reference circuit and an output circuit; the key comparison circuit has a plurality of displacement buffers, and the displacement buffers are connected to corresponding LED lamps; the amplifier circuit includes two field effect tubes connected in series. Each combustible gas controller has 32 signal detection channels, that is, one controller of the present invention can carry 32 combustible gas detectors, the interface capacity is relatively large, the response is fast, and the data error is small.

Description

Technical Field

[0001] The invention relates to a controller, in particular to a combustible gas controller. Background Art

[0002] The combustible gas controller is a device used to control gas. Common gas controllers on the market include point-to-point light column analog alarm controllers, point-to-point digital display alarm controllers, and RS-485 / HART bus gas alarm controllers.

[0003] A general combustible gas controller has only 10-12 signal detection channels, which means that one controller can only control 10-12 combustible gas detectors. The interface capacity is relatively small and there is a certain error.

[0004] The known CN 113808373 A is a combustible gas alarm controller with 16 analog line outputs. The signals of multiple detectors (up to 16 signal sources) are input into the sub-control module for data processing, and then sequentially input into the main control module through the sub-control bus output module and the main control bus input module for data processing, and finally output up to 16 current analog outputs through the multi-line current analog output module for multi-point transmission. The interface capacity is still relatively small. It cannot meet the needs of modern petroleum and natural gas, petrochemical, metallurgy, oil depot industries, etc. Summary of the invention

[0005] In order to solve the problem of small interface capacity, the present invention provides a combustible gas controller with large interface capacity and high sensitivity.

[0006] The present invention provides the following technical solutions:

[0007] A combustible gas controller comprises a CPU microcontroller, a crystal oscillator circuit, a pulse circuit, a clock circuit, a signal conversion circuit and a key comparison circuit. The crystal oscillator circuit, the pulse circuit, the clock circuit, the signal conversion circuit and the key comparison circuit are all connected to the CPU microcontroller. The crystal oscillator circuit can generate a clock frequency signal necessary for the CPU microcontroller to execute instructions, and the crystal oscillator circuit has a crystal oscillator; the pulse circuit generates a pulse signal and performs necessary conversion processing on the generated pulse signal, and the pulse circuit has a positive low-dropout voltage regulator with an output voltage of 3.3V; the clock circuit provides a beat to the CPU microcontroller, performs work in chronological order, and has a clock chip; the signal conversion circuit comprises a voltage stabilization circuit, a reference circuit and an output circuit, and the signal conversion circuit can convert different types of signals to each other; the key comparison circuit has a plurality of displacement buffers, and the displacement buffers are connected to corresponding LED lights; the amplifier circuit comprises two field effect transistors connected in series.

[0008] Furthermore, the IN terminal of the forward low-dropout voltage regulator is connected to a group of capacitors in parallel, and the OUT terminal of the forward low-dropout voltage regulator is connected to another group of capacitors in parallel.

[0009] Furthermore, the voltage stabilization circuit comprises a voltage stabilizer and a plurality of capacitors, the IN terminal of the voltage stabilizer is connected to the capacitor, the OUT terminal of the voltage stabilizer is connected to the inductor, and the capacitor is connected in parallel between the IN terminal and the OUT terminal.

[0010] Furthermore, the reference loop comprises a voltage stabilizer, a diode and a plurality of capacitors, the OUT end of the voltage stabilizer is connected to the inductor and the diode, and the IN end of the voltage stabilizer is connected to the output circuit.

[0011] Furthermore, the output circuit has a plurality of capacitors, transient voltage suppression diodes and Schottky diodes connected in parallel, and the capacitors are connected in parallel to the transient voltage suppression diodes and the Schottky diodes.

[0012] Furthermore, the field effect transistors are connected via resistors.

[0013] Compared with the prior art, the beneficial effects of the present invention are: each combustible gas controller has 32 signal detection channels, that is, one controller of the present invention can carry 32 combustible gas detectors, the interface capacity is relatively large, the response is fast, and the data error is small.

[0014] The controller of the present invention has reasonable layout of various circuits, small size, and convenient use. The detector can detect the concentration of combustible gas in the workplace environment in real time and transmit the concentration value information to the controller. The signal conversion is sensitive, the response is fast, and it can be displayed in real time. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a principle block diagram of the present invention.

[0016] Figure 2 This is a diagram of the CPU microcontroller of the present invention.

[0017] Figure 3 This is the pulse circuit diagram of the present invention.

[0018] Figure 4 This is a clock circuit diagram of the present invention.

[0019] Figure 5 This is a circuit diagram of the button comparison loop of the present invention.

[0020] Figure 6 It is a signal conversion circuit diagram of the present invention.

[0021] Figure 7 This is the amplification circuit diagram of the present invention.

[0022] In the figure: 1. CPU microcontroller; 2. crystal oscillator circuit; 3. pulse circuit; 4. clock circuit; 5. signal conversion circuit; 6. key comparison circuit, 7. amplifier circuit. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] See also Figure 1 and Figure 2 The combustible gas controller of the present invention comprises a CPU microcontroller 1, a crystal oscillator circuit 2, a pulse circuit 3, a clock circuit 4, a signal conversion circuit 5, a key comparison circuit 6 and an amplifier circuit 7. The crystal oscillator circuit 2, the pulse circuit 3, the clock circuit 4, the signal conversion circuit 5, the key comparison circuit 6 and the amplifier circuit 7 are all connected to the CPU microcontroller 1.

[0025] Figure 2 It is a CPU microcontroller 1, using chip U2, model STM32F103ZET6.

[0026] The crystal oscillator circuit 2 can generate a clock frequency signal necessary for the CPU microcontroller to execute instructions. The crystal oscillator circuit has a crystal oscillator X1, capacitors C14 and C15 connected in parallel on both sides of the crystal oscillator X1, and a reset switch RESET.

[0027] Figure 3 As shown, the pulse circuit 3 generates a pulse signal and performs necessary conversion processing on the generated pulse signal. The pulse circuit has a forward low-dropout regulator U4 with an output voltage of 3.3V. The IN end of the forward low-dropout regulator U4 is connected to a capacitor C11 and a capacitor C12 in parallel, and the OUT end of the forward low-dropout regulator U4 is connected to a capacitor C10 and a capacitor C13 in parallel.

[0028] Figure 4 As shown, the clock circuit 4 provides a beat to the CPU microcontroller 1 to execute work in time sequence, and has a clock chip U3.

[0029] Figure 6 The signal conversion circuit 5 shown includes a voltage stabilizing circuit 51, a reference circuit 52 and an output circuit 53. The voltage stabilizing circuit includes a voltage stabilizer U6 and a plurality of capacitors. The IN terminal of the voltage stabilizer U6 is connected to a capacitor C24, the OUT terminal of the voltage stabilizer U6 is connected to an inductor L2, and capacitors C26, C23 and C22 are connected in parallel between the IN terminal and the OUT terminal.

[0030] The reference loop includes a voltage regulator U5, a diode D9 and a plurality of capacitors. The OUT terminal of the voltage regulator U5 is connected to the inductor L1 and the diode D9, and the IN terminal of the voltage regulator U5 is connected to the output circuit.

[0031] The output circuit has a plurality of capacitors, a transient voltage suppression diode D10 and a Schottky diode D8 connected in parallel. Capacitor C18, capacitor C17 and capacitor 21 are connected in parallel, and then connected to the transient voltage suppression diode D10 and the Schottky diode D8.

[0032] The signal conversion circuit can convert different types of signals to each other, which is convenient for transmission and processing. It can convert multi-channel detector signals into highly anti-interference current analog quantities for multi-point transmission, and the signal transmission has strong anti-interference ability.

[0033] Figure 5 As shown, the key comparison loop 6 has two displacement buffers, the pins of the displacement buffer U1 and the displacement buffer U2 are connected, and the displacement buffers are connected to corresponding LED lights.

[0034] Figure 7 As shown, the amplifier circuit 7 includes two field effect tubes connected in series, and the field effect tubes Q8 and Q9 are connected through a resistor R21. The function of the field effect tube is to amplify the signal, because the field effect tube amplifier can input a very high impedance, so the coupling current can be small.

[0035] For example, the combustible gas controller in a factory workshop was modified and installed in the operation room. The detection signal of the combustible gas detector from the site was connected to each channel of the combustible gas controller. Through the 485 communication interface on the controller and the cable, it was connected to the 485 communication terminal on the communication card of the central control DCS system, and the combustible gas measurement signal was sent to the DCS system for display and recording.

[0036] The current signals sent by all combustible gas detection instruments on site are first connected to the combustible gas controller, which centrally controls and manages them and gives audible and visual alarms.

[0037] Each combustible gas controller has 32 signal detection channels, that is to say, one controller of the present invention can carry 32 combustible gas detectors, the interface capacity is relatively large, the response is fast, and the data error is small.

[0038] The controller of the present invention has reasonable layout of various circuits, small size, and convenient use. The detector can detect the concentration of combustible gas in the workplace environment in real time and transmit the concentration value information to the controller. The signal conversion is sensitive, the response is fast, and it can be displayed in real time.

[0039] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Combustible gas controller, characterized by: The invention comprises a CPU microcontroller (1), a crystal oscillator circuit (2), a pulse circuit (3), a clock circuit (4), a signal conversion circuit (5), a key comparison circuit (6) and an amplifier circuit (7), wherein the crystal oscillator circuit (2), the pulse circuit (3), the clock circuit (4), the signal conversion circuit (5), the key comparison circuit (6) and the amplifier circuit (7) are all connected to the CPU microcontroller (1), the crystal oscillator circuit (2) can generate a clock frequency signal required for the CPU microcontroller to execute instructions, and the crystal oscillator circuit has a crystal oscillator; the pulse circuit (3) generates a pulse signal and The pulse signal is converted and processed as necessary, and the pulse circuit has a positive low-dropout voltage regulator with an output voltage of 3.3V; the clock circuit (4) provides a beat to the CPU microcontroller (1) and performs work in time sequence, and has a clock chip; the signal conversion circuit (5) includes a voltage stabilization circuit (51), a reference circuit (52) and an output circuit (53), and the signal conversion circuit can convert different types of signals to each other; the key comparison circuit (6) has a plurality of displacement buffers, and the displacement buffers are connected to corresponding LED lights; the amplifier circuit (7) includes two field effect transistors connected in series; The pulse circuit (3) has a forward low-dropout voltage regulator U4 with an output voltage of 3.3V. The model of the forward low-dropout voltage regulator U4 is AMS1117-3.

3. The IN terminal of the forward low-dropout voltage regulator U4 is connected to a capacitor C11 and a capacitor C12 connected in parallel. The capacitor C11 and the capacitor C12 are connected in parallel to a resistor R5 and an LED. The resistor R5 and the LED are connected in series. The resistor R5 is also connected to a power socket PWR2.

5. The OUT terminal of the forward low-dropout voltage regulator U4 is connected to a capacitor C10 and a capacitor C13 connected in parallel. The voltage regulator circuit (51) comprises a voltage regulator U6 and a plurality of capacitors. The model of the voltage regulator U6 is TPS60400. The IN terminal of the voltage regulator U6 is connected to the capacitor C24. The OUT terminal of the voltage regulator U6 is connected to the inductor L2. The capacitor C26, the capacitor C23 and the capacitor C22 are connected in parallel between the IN terminal and the OUT terminal. The reference circuit (52) includes a voltage regulator U5, a diode D9 and a plurality of capacitors. The model of the voltage regulator U5 is LM2576T5.

0. The OUT terminal of the voltage regulator U5 is connected to the inductor L1 and the diode D9. The inductor L1 and the diode D9 are connected to the capacitor C16, the capacitor C20 and the capacitor C19 in parallel. The IN terminal of the voltage regulator U5 is connected to the output circuit (53). The output circuit (53) has a plurality of capacitors, a transient voltage suppression diode D10 and a Schottky diode D8 connected in parallel. The capacitor C18, the capacitor C17 and the capacitor 21 are connected in parallel and then connected to the transient voltage suppression diode D10 and the Schottky diode D8.

2. The combustible gas controller according to claim 1, characterized in that: The IN terminal of the forward low-dropout voltage regulator is connected to a group of capacitors connected in parallel, and the OUT terminal of the forward low-dropout voltage regulator is connected to another group of capacitors connected in parallel.

3. The combustible gas controller according to claim 1, characterized in that: The field effect transistors are connected through resistors.

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