CN112612302A - Carbon dioxide gas meter heating circuit and carbon dioxide gas meter - Google Patents
Carbon dioxide gas meter heating circuit and carbon dioxide gas meter Download PDFInfo
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- CN112612302A CN112612302A CN202011439984.5A CN202011439984A CN112612302A CN 112612302 A CN112612302 A CN 112612302A CN 202011439984 A CN202011439984 A CN 202011439984A CN 112612302 A CN112612302 A CN 112612302A
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 108
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 54
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 53
- 238000010438 heat treatment Methods 0.000 title claims abstract description 42
- 238000001514 detection method Methods 0.000 claims abstract description 44
- 238000005070 sampling Methods 0.000 claims description 18
- 238000001914 filtration Methods 0.000 claims description 13
- 238000004146 energy storage Methods 0.000 claims description 8
- 230000000087 stabilizing effect Effects 0.000 description 9
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 5
- 238000012423 maintenance Methods 0.000 description 5
- 229910052710 silicon Inorganic materials 0.000 description 5
- 239000010703 silicon Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 230000001960 triggered effect Effects 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D7/00—Control of flow
- G05D7/06—Control of flow characterised by the use of electric means
- G05D7/0617—Control of flow characterised by the use of electric means specially adapted for fluid materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
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- Engineering & Computer Science (AREA)
- Optics & Photonics (AREA)
- Mechanical Engineering (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Control Of Resistance Heating (AREA)
Abstract
The invention is suitable for the technical field of carbon dioxide gas meters, and provides a carbon dioxide gas meter heating circuit which comprises a power supply circuit, a heater, a driving circuit, a switch circuit, a current detection circuit and an overcurrent self-locking protection circuit, wherein the power supply output end of the heater is connected with the output end of the power supply circuit. The controlled end of the switch circuit is connected with the control signal output end of the drive circuit, and the input end of the switch circuit is connected with the output end of the heater. The input end of the current detection circuit is connected with the output end of the switch circuit, the output end of the current detection circuit is connected with the negative electrode of the power supply input, the input end of the overcurrent self-locking protection circuit is connected with the detection signal output end of the current detection circuit, and the first output end of the overcurrent self-locking protection circuit is connected with the feedback input end of the drive circuit. The technical problem that the fuse burns out and needs to be replaced is solved to above-mentioned scheme.
Description
Technical Field
The invention belongs to the technical field of carbon dioxide gas meters, and particularly relates to a carbon dioxide gas meter heating circuit and a carbon dioxide gas meter.
Background
Carbon dioxide is as a welding machine common gas, can control carbon dioxide gas flow with the gas meter usually, and when the gas meter freezes, thereby the gas flow is influenced easily to frozen gas meter thereby the molten bath when leading to the welding protects improperly, the welding seam shaping is not pleasing to the eye, generally can be provided with heating circuit in the gas meter this moment in order to heat carbon dioxide, thereby make gas flow even, but current heating circuit protection measure generally fuses the protection through the protective tube, but this kind of heating circuit's protection measure is unreliable, the fuse burns out and needs to be changed, the user hardly finds the fuse with the specification.
Disclosure of Invention
In view of this, an embodiment of the present invention provides a carbon dioxide meter heating circuit to solve the problem that a fuse of a carbon dioxide meter is burned out and needs to be replaced.
A first aspect of an embodiment of the present invention provides a carbon dioxide meter heating circuit, including:
a power input anode;
a power input cathode;
the power supply circuit is provided with a positive input end, a negative input end and an output end, wherein the positive input end of the power supply circuit is connected with the positive electrode of the power supply input, and the negative input end of the power supply circuit is connected with the negative electrode of the power supply input and is used for rectifying and filtering the input power supply;
the power supply output end of the heater is connected with the output end of the power supply circuit and is used for heating carbon dioxide gas;
a drive circuit having a feedback input terminal and a control signal output terminal, and outputting a switch drive signal;
the controlled end of the switch circuit is connected with the control signal output end of the drive circuit, and the input end of the switch circuit is connected with the output end of the heater and used for being switched on or switched off according to the switch drive signal;
the current detection circuit is provided with an input end, an output end and a detection signal output end, the input end of the current detection circuit is connected with the output end of the switch circuit, and the output end of the current detection circuit is connected with the negative electrode of the power supply input and is used for outputting a corresponding current sampling signal according to the working current of the switch circuit;
the overcurrent self-locking protection circuit is provided with an input end, a first output end and a second output end, the input end of the overcurrent self-locking protection circuit is connected with the detection signal output end of the current detection circuit, and the first output end of the overcurrent self-locking protection circuit is connected with the feedback input end of the drive circuit and used for forcing the drive circuit to be turned off to close the heater when the current sampling signal exceeds a preset current value.
Optionally, when the current sampling signal is lower than or equal to a preset current value, the overcurrent self-locking protection circuit outputs a first overcurrent feedback signal of a first level; when the current sampling signal is larger than a preset current value, the overcurrent self-locking protection circuit outputs a first overcurrent feedback signal of a second level; and the drive circuit is used for stopping outputting the switch drive signal when the first overcurrent feedback signal is at a second level.
Optionally, the power supply circuit includes a rectifying circuit and a filter circuit, the rectifying circuit has a first input end, a second input end and an output end, the first input end of the rectifying circuit is a positive input end of the power supply circuit, the second input end of the rectifying circuit is a negative input end of the power supply circuit, and the output end of the rectifying circuit is connected with the input end of the filter circuit; the output end of the filter circuit is the output end of the power supply circuit; or the like, or, alternatively,
the power supply circuit comprises a rectifying circuit, a filter circuit and an energy storage circuit, wherein the rectifying circuit is provided with a first input end, a second input end and an output end, the first input end of the rectifying circuit is the positive input end of the power supply circuit, the second input end of the rectifying circuit is the negative input end of the power supply circuit, and the output end of the rectifying circuit is connected with the input end of the filter circuit; the output end of the filter circuit is connected with the input end and the output end of the energy storage circuit, and the connection node of the filter circuit is the output end of the power supply circuit.
Optionally, the power circuit further includes a voltage stabilizing circuit, an input end of the voltage stabilizing circuit is connected to an output end of the power circuit, and an output end of the voltage stabilizing circuit is connected to a power end of the driving circuit.
Optionally, the switching circuit is a high power switching tube.
Optionally, the overcurrent self-locking protection circuit comprises an overcurrent self-locking power input end, a voltage division module, a first one-way conduction module, a second one-way conduction module, an overcurrent self-locking module, a filtering module and a voltage division detection module, wherein the input end of the voltage division detection module is the input end of the overcurrent self-locking protection circuit, and the output end of the voltage division detection module, the control end of the overcurrent self-locking module and the input and output end of the filtering module are interconnected; the output end of the overcurrent self-locking module is grounded, and the input end of the overcurrent self-locking module, the output end of the first one-way conduction module and the output end of the second one-way conduction module are interconnected; the input end of the first unidirectional conduction module is the first output end of the overcurrent self-locking protection circuit, the input end of the second unidirectional conduction module is connected with the first end of the voltage division module, and the connection node of the first unidirectional conduction module is the second output end of the overcurrent self-locking protection circuit; and the second end of the voltage division module is connected with the input end of the overcurrent self-locking power supply.
Optionally, the overcurrent self-locking module is a silicon controlled rectifier device.
Optionally, the carbon dioxide gas meter heating circuit further comprises a control circuit, the drive circuit further comprises a controlled end, the control circuit comprises an overcurrent signal input end and a control signal output end, the overcurrent signal input end of the control circuit is connected with the second output end of the overcurrent self-locking protection circuit, and the control signal output end of the control circuit is connected with the controlled end of the drive circuit;
the control circuit is used for outputting a control signal according to a second feedback signal output by the overcurrent self-locking protection circuit;
the driving circuit is further configured to output the corresponding switch driving signal according to the control signal.
Optionally, the carbon dioxide gas meter heating circuit further comprises a fault indication circuit, the control circuit further comprises a fault signal output end, and the fault signal output end of the control circuit is connected with the input end of the fault indication circuit;
the control circuit is used for outputting a corresponding fault signal according to the second feedback signal;
and the fault indicating circuit is used for indicating the working state of the heater according to the fault signal.
A second aspect of embodiments of the present invention provides a carbon dioxide meter comprising a carbon dioxide meter heating circuit as described above.
The embodiment of the invention designs a carbon dioxide gas meter heating circuit which comprises a power input anode, a power input cathode, a power circuit, a heater, a driving circuit, a switching circuit, a current detection circuit and an overcurrent self-locking protection circuit, wherein the power circuit carries out rectification and filtering processing on an input power. The heater heats the carbon dioxide gas. The driving circuit outputs a switch driving signal, and the switch circuit is switched on or off according to the switch driving signal. The current detection circuit outputs a corresponding current sampling signal according to the working current of the switch circuit, and the overcurrent self-locking protection circuit forces the drive circuit to be switched off to close the heater when the current sampling signal exceeds a preset current value. In the embodiment, by the scheme, the current detection function is realized by adding the current detection circuit, so that the overcurrent self-locking protection circuit automatically protects and locks the protection state when the heater is overloaded, and the technical problem that the fuse is burnt out and needs to be replaced is solved. Therefore, the overcurrent detection of the switching circuit can be realized on the basis of no control circuit, and the driving circuit is controlled to stop to close the heater when the overcurrent occurs, so that the overcurrent protection is realized, and the overcurrent self-locking protection circuit does not need to be replaced after once overcurrent protection. And thus also saves maintenance, use and overhaul costs of the gas meter.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a block schematic diagram of a carbon dioxide gas meter heating circuit of the present invention;
FIG. 2 is a block schematic diagram of a carbon dioxide meter heating circuit of the present invention;
fig. 3 is a schematic circuit diagram of an overcurrent self-locking protection circuit of the carbon dioxide gas meter heating circuit of the invention.
Detailed Description
In order to make the technical solutions of the present invention better understood by those skilled in the art, the technical solutions in the embodiments of the present invention will be clearly described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "comprises" and "comprising," and any variations thereof, in the description and claims of this invention and the above-described drawings are intended to cover non-exclusive inclusions. For example, a process, method, or system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
The invention provides a carbon dioxide gas meter heating circuit, and aims to solve the technical problem that a fuse is burnt out and needs to be replaced.
IN one embodiment, as shown IN fig. 1, the carbon dioxide meter heating circuit includes a positive power input terminal IN +, a negative power input terminal IN-, a power circuit 10, a heater 20, a driving circuit 60, a switching circuit 30, a current detection circuit 40, and an overcurrent self-locking protection circuit 50.
The power circuit 10 has a positive input terminal, a negative input terminal and an output terminal, the driving circuit 60 has a feedback input terminal and a control signal output terminal, the positive input terminal of the power circuit 10 is connected with a power input positive terminal IN +, the negative input terminal of the power circuit 10 is connected with a power input negative terminal IN-, the power output terminal of the heater 20 is connected with the output terminal of the power circuit 10, the controlled terminal of the switching circuit 30 is connected with the control signal output terminal of the driving circuit 60, the input terminal of the switching circuit 30 is connected with the output terminal of the heater 20, the current detecting circuit 40 has an input terminal, an output terminal and a detection signal output terminal, the input terminal of the current detecting circuit 40 is connected with the output terminal of the switching circuit 30, the output terminal of the current detecting circuit 40 is connected with the power input negative terminal IN-, the overcurrent self-locking protection circuit 50 has an input terminal, the input end of the over-current self-locking protection circuit 50 is connected with the detection signal output end of the current detection circuit 40, and the first output end of the over-current self-locking protection circuit 50 is connected with the feedback input end of the drive circuit 60.
The power circuit 10 rectifies and filters an input power, the heater 20 heats carbon dioxide gas, the driving circuit 60 outputs a switch driving signal, the switch circuit 30 is turned on or off according to the switch driving signal, the current detection circuit 40 outputs a corresponding current sampling signal according to a working current of the switch circuit 30, and the overcurrent self-locking protection circuit 50 forcibly turns off the driving circuit 60 to turn off the heater 20 when the current sampling signal exceeds a preset current value. In the above embodiment, by the above scheme, the current detection function is realized by adding the current detection circuit 40, so that the overcurrent self-locking protection circuit 50 automatically protects and locks the protection state when the heater 20 is overloaded, thereby solving the technical problem that the fuse is burnt out and needs to be replaced. The circuit can be effectively protected from running reliably, the fault rate of the whole machine is reduced, and the maintenance rate of a user is reduced. The over-current detection of the switch circuit 30 is realized on the basis of no control circuit, and the drive circuit 60 is controlled to stop to close the switch circuit 30 when the over-current occurs, so that the heater 20 stops working, the over-current protection is realized, and the over-current self-locking protection circuit 50 does not need to be replaced after once over-current protection. And thus also saves maintenance, use and overhaul costs of the gas meter.
Alternatively, the heater 20 may be implemented by a 10R/150W power resistor, and it should be noted that a normally closed temperature protection switch may be provided to protect the heater 20 from over-temperature.
Optionally, when the current sampling signal is lower than or equal to the preset current value, the overcurrent self-locking protection circuit 50 outputs a first overcurrent feedback signal at a first level; when the current sampling signal is greater than the preset current value, the overcurrent self-locking protection circuit 50 outputs a first overcurrent feedback signal of a second level; the driving circuit 60 stops outputting the switch driving signal when the first overcurrent feedback signal is at the second level.
In one embodiment, the power circuit 10 includes a rectifying circuit and a filtering circuit, the rectifying circuit has a first input end, a second input end and an output end, the first input end of the rectifying circuit is a positive input end of the power circuit 10, the second input end of the rectifying circuit is a negative input end of the power circuit 10, and the output end of the rectifying circuit is connected with the input end of the filtering circuit; the output terminal of the filter circuit is the output terminal of the power supply circuit 10.
The rectifying circuit rectifies an input power, and the filter circuit filters the rectified power to supply an operating power to the heater 20. Thereby, the power supply voltage of the heater 20 is ensured to be stable, and the situations of overheating or uneven heating of the heater 20 caused by power supply problems are avoided.
In another embodiment, the power circuit 10 includes a rectifying circuit, a filtering circuit and an energy storage circuit, the rectifying circuit has a first input end, a second input end and an output end, the first input end of the rectifying circuit is the positive input end of the power circuit 10, the second input end of the rectifying circuit is the negative input end of the power circuit 10, and the output end of the rectifying circuit is connected with the input end of the filtering circuit; the output end of the filter circuit is connected with the input and output ends of the energy storage circuit, and the connection node of the filter circuit is the output end of the power supply circuit 10.
The rectifying circuit rectifies an input power, and the filter circuit filters the rectified power to supply an operating power to the heater 20. The tank circuit is typically a battery-carrying circuit that provides power to the heater 20 when no input power is applied. Therefore, various power supply modes of the heater 20 can be realized, and the outdoor carrying and high-power utilization are guaranteed. It is worth noting that, at this time, the rectifying circuit, the filter circuit and the energy storage circuit can be selected from commonly used rectifying circuits, filter circuits and energy storage circuits according to needs.
Optionally, as shown in fig. 2, the power circuit 10 further includes a voltage stabilizing circuit 70, an input terminal of the voltage stabilizing circuit 70 is connected to an output terminal of the power circuit 10, and an output terminal of the voltage stabilizing circuit 70 is connected to a power terminal of the driving circuit 60.
The voltage stabilizing circuit 70 provides the driving circuit 60 with operating power. It is noted that, in this case, the voltage stabilizing circuit 70 may be a conventional voltage stabilizing circuit 70 according to the requirement.
Optionally, the switching circuit 30 is a power switching tube, and the power switching tube can implement fast switching, such as a high-power MOS tube.
Optionally, as shown in fig. 3, the overcurrent self-locking protection circuit 50 includes an overcurrent self-locking power supply input terminal VCC, a voltage division module 501, a first unidirectional conduction module 502, a second unidirectional conduction module 503, an overcurrent self-locking module 504, a filter module 505, and a voltage division detection module 506, an input terminal of the voltage division detection module 506 is an input terminal of the overcurrent self-locking protection circuit 50, and an output terminal of the voltage division detection module 506, a control terminal of the overcurrent self-locking module 504, and an input and output terminal of the filter module 505 are interconnected; the output end of the over-current self-locking module 504 is grounded, and the input end of the over-current self-locking module 504, the output end of the first one-way conduction module 502 and the output end of the second one-way conduction module 503 are interconnected; the input end of the first unidirectional conduction module 502 is the first output end of the overcurrent self-locking protection circuit 50, the input end of the second unidirectional conduction module 503 is connected with the first end of the voltage division module 501, and the connection node is the second output end of the overcurrent self-locking protection circuit 50; the second end of the voltage dividing module 501 is connected to the overcurrent self-locking power input VCC.
The overcurrent self-locking protection circuit 50 has two working states, firstly, the current detection circuit 40 detects the working current of the high-power switching tube wave by wave, and in the first working state, when the heater 20 works normally, the current sampling signal detected by the current detection circuit 40 is small, and the overcurrent self-locking module 504 cannot be triggered to work. In the second operating state, that is, when the heater 20 has a fault or a short circuit, the current sampling signal triggers the overcurrent self-locking module 504 to conduct and self-lock via the filtering module 505 and the voltage division detecting module 506, the signal output to the driving circuit 60 via the second conducting module is pulled down to 0V, the driving signal output of the driving circuit 60 is forced to be turned off, so that the driving signal is also 0V, the switching circuit 30 stops operating, the heater 20 stops operating, and the heater enters the protection state. The feedback signal output to the control circuit via the first unidirectional conducting module 502 is pulled down to 0V, and the control circuit receives the overcurrent protection signal, so that the control circuit obtains the operating state of the heater 20. IN addition, when the power input positive electrode IN + and the power input negative electrode IN-are connected with the voltage of 0V, the whole carbon dioxide gas meter heating circuit has no power supply, the overcurrent self-locking module 504 automatically releases the self-locking state, the overcurrent self-locking protection circuit 50 resets, and the overcurrent protection state is exited. Through the circuit, overcurrent detection and overcurrent protection can be easily triggered, automatic protection of the carbon dioxide gas meter heating circuit is realized, the protection state is locked, the reliable operation of the circuit can be effectively protected, the fault rate of the whole machine is reduced, and the maintenance rate of a user is reduced.
Optionally, the over-current latching module 504 is a thyristor device.
Optionally, as shown in fig. 2, the carbon dioxide meter heating circuit further includes a control circuit 80, the driving circuit 60 further includes a controlled end, the control circuit 80 includes an overcurrent signal input end and a control signal output end, the overcurrent signal input end of the control circuit 80 is connected to the second output end of the overcurrent self-locking protection circuit 50, and the control signal output end of the control circuit 80 is connected to the controlled end of the driving circuit 60.
The control circuit 80 outputs a control signal according to the second feedback signal output by the over-current self-locking protection circuit 50, and the driving circuit 60 outputs a corresponding switch driving signal according to the control signal. It should be noted that the control circuit 80 can adjust the waveform of the control signal according to the heating requirement, that is, adjust the frequency and duty ratio of the control signal, so as to adjust the on-off speed of the high-power switch tube, when the high-power switch tube is on, the heater 20 works, and when the high-power switch tube is off, the heater 20 stops working. By adjusting the on/off speed of the high power switching tube, the heater 20 can be heated quickly or slowly. Through the circuit, the intelligent on-demand control of the output of the driving signal can be realized, the effective feedback of overcurrent protection can be realized, only reminding can be realized, and a user can know the working state of the heater 20 conveniently. Alternatively, the control circuit 80 may be a commonly used control chip.
Optionally, as shown in fig. 2, the carbon dioxide meter heating circuit further includes a fault indication circuit 90, the control circuit 80 further includes a fault signal output terminal, and the fault signal output terminal of the control circuit 80 is connected to an input terminal of the fault indication circuit 90.
Wherein the control circuit 80 outputs a corresponding fault signal according to the second feedback signal, and the fault indication circuit 90 indicates the working state of the heater 20 according to the fault signal. And a fault indicator lamp or a corresponding error code is added, so that a user can visually judge whether the heater 20 is in a normal working state, and the effects of effectively protecting a molten pool by CO2 gas, forming a perfect welding seam and the like are achieved. Alternatively, the fault indication circuit 90 may be in various modes such as audio indication playing, screen display, and light display.
The principle of the overcurrent self-locking protection circuit 50 is explained below with reference to fig. 3:
the circuit principle is described below with the voltage dividing module 501 as a first resistor R1, the first unidirectional conducting module 502 as a first diode D1, the second unidirectional conducting module 503 as a second diode D2, the overcurrent locking module 504 as a unidirectional silicon device Q1, the filtering module 505 as a first capacitor C1, and the voltage dividing detecting module 506 as a second resistor R2:
when the heater 20 works normally, the current sampling signal detected by the current detection circuit 40 is small, and the unidirectional silicon device cannot be triggered to work.
When the heater 20 has a fault or a short circuit, the current sampling signal triggers the one-way silicon device to be switched on and self-locked through the first capacitor and the second resistor, the signal output to the driving circuit 60 through the second switch-on module is pulled down to 0V, the driving signal output of the driving circuit 60 is forced to be switched off, so that the driving signal is also 0V, the switching circuit 30 stops working, the heater 20 stops working, and the heater enters a protection state. The feedback signal output to the control circuit 80 via the first diode is pulled down to 0V, the control circuit 80 receives the overcurrent protection signal, so that the control circuit 80 obtains the working state of the heater 20, and then the control circuit 80 can output a fault signal to the fault indication circuit 90 for indication, so as to explain the working state of the heater 20.
When the power input anode IN + and the power input cathode IN-are connected with the voltage of 0V, the whole carbon dioxide gas meter heating circuit is not provided with a power supply, the one-way silicon device automatically releases the self-locking state, resets and exits from the overcurrent protection state. Through the circuit, overcurrent detection and overcurrent protection can be easily triggered, automatic protection of the carbon dioxide gas meter heating circuit is realized, the protection state is locked, the reliable operation of the circuit can be effectively protected, the fault rate of the whole machine is reduced, and the maintenance rate of a user is reduced.
In order to achieve the purpose, the invention also provides a carbon dioxide meter which comprises the carbon dioxide meter heating circuit.
It should be noted that, since the carbon dioxide meter of the present invention includes all embodiments of the above-mentioned heating circuit of the carbon dioxide meter, the carbon dioxide meter of the present invention has all the advantages of the above-mentioned heating circuit of the carbon dioxide meter, and details thereof are not repeated herein.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. A carbon dioxide gas meter heating circuit, comprising:
a power input anode;
a power input cathode;
the power supply circuit is provided with a positive input end, a negative input end and an output end, wherein the positive input end of the power supply circuit is connected with the positive electrode of the power supply input, and the negative input end of the power supply circuit is connected with the negative electrode of the power supply input and is used for rectifying and filtering the input power supply;
the power supply output end of the heater is connected with the output end of the power supply circuit and is used for heating carbon dioxide gas;
a drive circuit having a feedback input terminal and a control signal output terminal, and outputting a switch drive signal;
the controlled end of the switch circuit is connected with the control signal output end of the drive circuit, and the input end of the switch circuit is connected with the output end of the heater and used for being switched on or switched off according to the switch drive signal;
the current detection circuit is provided with an input end, an output end and a detection signal output end, the input end of the current detection circuit is connected with the output end of the switch circuit, and the output end of the current detection circuit is connected with the negative electrode of the power supply input and is used for outputting a corresponding current sampling signal according to the working current of the switch circuit;
the overcurrent self-locking protection circuit is provided with an input end, a first output end and a second output end, the input end of the overcurrent self-locking protection circuit is connected with the detection signal output end of the current detection circuit, and the first output end of the overcurrent self-locking protection circuit is connected with the feedback input end of the drive circuit and used for forcing the drive circuit to be turned off to close the heater when the current sampling signal exceeds a preset current value.
2. The carbon dioxide gas meter heating circuit of claim 1, wherein when the current sampling signal is lower than or equal to a preset current value, the over-current self-locking protection circuit outputs a first over-current feedback signal at a first level; when the current sampling signal is larger than a preset current value, the overcurrent self-locking protection circuit outputs a first overcurrent feedback signal of a second level; the driving circuit is further configured to stop outputting the switch driving signal when the first overcurrent feedback signal is at the second level.
3. The carbon dioxide gas meter heating circuit of claim 1, wherein the power circuit comprises a rectifier circuit and a filter circuit, the rectifier circuit having a first input, a second input, and an output, the first input of the rectifier circuit being a positive input of the power circuit, the second input of the rectifier circuit being a negative input of the power circuit, the output of the rectifier circuit being connected to the input of the filter circuit; the output end of the filter circuit is the output end of the power supply circuit; or the like, or, alternatively,
the power supply circuit comprises a rectifying circuit, a filter circuit and an energy storage circuit, wherein the rectifying circuit is provided with a first input end, a second input end and an output end, the first input end of the rectifying circuit is the positive input end of the power supply circuit, the second input end of the rectifying circuit is the negative input end of the power supply circuit, and the output end of the rectifying circuit is connected with the input end of the filter circuit; the output end of the filter circuit is connected with the input end and the output end of the energy storage circuit, and the connection node of the filter circuit is the output end of the power supply circuit.
4. The carbon dioxide gas meter heating circuit of claim 1, wherein the power circuit further comprises a voltage regulator circuit, an input terminal of the voltage regulator circuit being connected to an output terminal of the power circuit, an output terminal of the voltage regulator circuit being connected to a power terminal of the driving circuit.
5. The carbon dioxide gas meter heating circuit of claim 3, wherein the switching circuit is a power switching tube.
6. The carbon dioxide gas meter heating circuit according to any one of claims 1 to 5, wherein the over-current self-locking protection circuit comprises an over-current self-locking power input end, a voltage division module, a first one-way conduction module, a second one-way conduction module, an over-current self-locking module, a filtering module and a voltage division detection module, wherein the input end of the voltage division detection module is the input end of the over-current self-locking protection circuit, and the output end of the voltage division detection module, the control end of the over-current self-locking module and the input and output ends of the filtering module are interconnected; the output end of the overcurrent self-locking module is grounded, and the input end of the overcurrent self-locking module, the output end of the first one-way conduction module and the output end of the second one-way conduction module are interconnected; the input end of the first unidirectional conduction module is the first output end of the overcurrent self-locking protection circuit, the input end of the second unidirectional conduction module is connected with the first end of the voltage division module, and the connection node of the first unidirectional conduction module is the second output end of the overcurrent self-locking protection circuit; and the second end of the voltage division module is connected with the input end of the overcurrent self-locking power supply.
7. The carbon dioxide gas meter heating circuit of claim 4 or 5, wherein the overcurrent latching module is a thyristor device.
8. The carbon dioxide gas meter heating circuit according to any one of claims 1-5, wherein the carbon dioxide gas meter heating circuit further comprises a control circuit, the driving circuit further comprises a controlled terminal, the control circuit comprises an overcurrent signal input terminal and a control signal output terminal, the overcurrent signal input terminal of the control circuit is connected with the second output terminal of the overcurrent self-locking protection circuit, and the control signal output terminal of the control circuit is connected with the controlled terminal of the driving circuit;
the control circuit is used for outputting a control signal according to a second feedback signal output by the overcurrent self-locking protection circuit;
the driving circuit is further configured to output the corresponding switch driving signal according to the control signal.
9. The carbon dioxide gas meter heating circuit of claim 8, further comprising a fault indication circuit, wherein the control circuit further comprises a fault signal output, wherein the fault signal output of the control circuit is connected to an input of the fault indication circuit;
the control circuit is used for outputting a corresponding fault signal according to the second feedback signal;
and the fault indicating circuit is used for indicating the working state of the heater according to the fault signal.
10. A carbon dioxide gas meter, characterized in that it comprises a carbon dioxide gas meter heating circuit according to any of claims 1-9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011439984.5A CN112612302A (en) | 2020-12-11 | 2020-12-11 | Carbon dioxide gas meter heating circuit and carbon dioxide gas meter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011439984.5A CN112612302A (en) | 2020-12-11 | 2020-12-11 | Carbon dioxide gas meter heating circuit and carbon dioxide gas meter |
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| CN112612302A true CN112612302A (en) | 2021-04-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011439984.5A Pending CN112612302A (en) | 2020-12-11 | 2020-12-11 | Carbon dioxide gas meter heating circuit and carbon dioxide gas meter |
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| CN101724824A (en) * | 2008-10-31 | 2010-06-09 | 中国科学院沈阳科学仪器研制中心有限公司 | Over-current protection device for physical vapor deposition heating system |
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| CN203537249U (en) * | 2013-10-18 | 2014-04-09 | 上海通用重工集团有限公司 | Carbon dioxide gas heater power supply |
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| CN214174923U (en) * | 2020-12-11 | 2021-09-10 | 深圳市佳士科技股份有限公司 | Carbon dioxide gas meter heating circuit and carbon dioxide gas meter |
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- 2020-12-11 CN CN202011439984.5A patent/CN112612302A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101724824A (en) * | 2008-10-31 | 2010-06-09 | 中国科学院沈阳科学仪器研制中心有限公司 | Over-current protection device for physical vapor deposition heating system |
| CN201833101U (en) * | 2010-04-16 | 2011-05-18 | 深圳市佳士科技股份有限公司 | Welding power supply circuit with input current limiting function |
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