CN107634577B - Power-off detection control circuit and gas meter - Google Patents
Power-off detection control circuit and gas meter Download PDFInfo
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- CN107634577B CN107634577B CN201710838789.1A CN201710838789A CN107634577B CN 107634577 B CN107634577 B CN 107634577B CN 201710838789 A CN201710838789 A CN 201710838789A CN 107634577 B CN107634577 B CN 107634577B
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Abstract
The invention provides a power-off detection control circuit and a gas meter, and relates to the technical field of power-off detection. The power-off detection control circuit comprises a power-off detection circuit, a power supply circuit and a controller, wherein the power-off detection circuit is electrically connected with the power supply circuit, the controller and an external power supply, and the power supply circuit is electrically connected with the controller and the external power supply. The power supply circuit charges when the external power supply is connected, after the external power supply is disconnected, the power supply circuit continuously provides voltage for the power-off detection circuit and the controller through discharging, the controller controls the gas meter to execute a first operation when the power-off detection circuit detects that the external power supply is powered off, and controls the gas meter to execute a second operation when the power-off detection circuit detects that the external power supply is connected again, and the safety switch valve and the safety performance of data storage of the gas meter are ensured by timely and accurately judging the power supply condition of the external power supply.
Description
Technical Field
The invention relates to the technical field of power-off detection, in particular to a power-off detection control circuit and a gas meter.
Background
At present, the safe use of the fuel gas has become a serious issue in the living at home, the application of the fuel gas meter at the initial stage is only represented by metering the fuel gas usage data, the meter reading needs to be manually realized, and the meter reading at home is carried out at the upper door, so that the efficiency is low, the labor intensity is high, and the charging and the management of a service platform of a fuel gas company are inconvenient. Along with the continuous development of the internet of things technology and the sensor technology, the application of the gas meter is wider and wider, the gas meter is more intelligent, various dilemmas caused by manual meter reading are solved, the gas use safety of a user can be monitored in real time, and when the gas use is abnormal, the user or a management platform can be timely informed to process, so that the conditions of leakage, ignition, explosion and the like are avoided. Therefore, the normal operation of the gas meter is particularly important.
In the using process of the gas meter, the situation of power failure can occur due to the disconnection of an external power supply, for example, the reasons of damage of an externally powered battery, consumption of electric quantity and the like, which are sporadic and cannot be controlled. For the gas meter, the gas meter cannot work normally after power failure, if the power supply condition of an external power supply cannot be perceived in real time, when the condition of sudden power failure occurs, no time allowance is left for data service storage, data transmission, valve control and other operations, the gas meter can cause internal program disorder due to sudden power failure, and further damage or loss of meter reading data is caused, the safety of valve switch control is difficult to ensure, and the gas use condition of a user cannot be monitored any more.
Disclosure of Invention
The invention aims to provide a power-off detection control circuit which is used for detecting the power supply condition of an external power supply in real time and executing operations such as switching valve, data storage, transmission and the like according to detection results.
The invention also aims to provide a gas meter for detecting the power supply condition of an external power supply in real time and executing operations such as switching on and off a valve, storing data, sending and the like according to the detection result.
In order to achieve the above object, the technical scheme adopted by the embodiment of the invention is as follows:
in a first aspect, the invention provides a power-off detection control circuit, which comprises a power-off detection circuit, a power supply circuit and a controller, wherein the power-off detection circuit is electrically connected with the power supply circuit, the controller and an external power supply, and the power supply circuit is electrically connected with the controller and the external power supply; the power supply circuit is used for charging when an external power supply is connected, and is also used for discharging when the external power supply is disconnected so as to provide discharging voltage for the power-off detection circuit and the controller; the power-off detection circuit is used for detecting whether an external power supply is disconnected or not and outputting a detection result to the controller; the controller is used for executing corresponding operation according to the detection result.
Further, the power failure detection circuit comprises a switching tube, a first end of the switching tube is used for being electrically connected with an external power supply, a second end of the switching tube is used for being electrically connected with the power supply circuit, and an output end of the switching tube is used for being electrically connected with the controller.
Further, the power-off detection circuit further comprises a first resistor and a second resistor, the first end of the switching tube is electrically connected with an external power supply through the first resistor, and the output end of the switching tube is electrically connected with the controller through the second resistor.
Further, the power-off detection circuit further comprises a first pull-down resistor and a second pull-down resistor, wherein the first pull-down resistor is electrically connected between the first end of the switch tube and the ground, and the second pull-down resistor is electrically connected between one end of the second resistor and the ground.
Further, the power supply circuit comprises a super capacitor, one end of the super capacitor is used for being electrically connected with the second end of the switch tube and an external power supply, and the other end of the super capacitor is grounded.
Further, the power supply circuit further comprises a first capacitor and a second capacitor, and the first capacitor and the second capacitor are electrically connected between one end of the super capacitor and the ground.
Further, the power supply circuit further comprises a diode, and the diode is electrically connected between one end of the super capacitor and an external power supply.
Further, the power supply circuit further comprises a power supply chip, the input end of the power supply chip is electrically connected with one end of the super capacitor, and the output end of the power supply chip is electrically connected with the controller.
Further, the power supply circuit further comprises a third capacitor and a fourth capacitor, and the third capacitor and the fourth capacitor are electrically connected between the output end of the power supply chip and the ground.
In a second aspect, the invention further provides a gas meter, the gas meter comprises a power-off detection control circuit, the power-off detection control circuit comprises a power-off detection circuit, a power supply circuit and a controller, the power-off detection circuit is electrically connected with the power supply circuit, the controller and an external power supply, and the power supply circuit is electrically connected with the controller and the external power supply; the power supply circuit is used for charging when an external power supply is connected, and is also used for discharging when the external power supply is disconnected so as to provide discharging voltage for the power-off detection circuit and the controller; the power-off detection circuit is used for detecting whether an external power supply is disconnected, and the controller is used for controlling the gas meter to execute a first operation when the power-off detection circuit detects that the external power supply is disconnected and controlling the gas meter to execute a second operation when the power-off detection circuit detects that the external power supply is connected.
Compared with the prior art, the invention has the following beneficial effects:
the power-off detection control circuit comprises a power-off detection circuit, a power supply circuit and a controller, wherein the power-off detection circuit is electrically connected with the power supply circuit, the controller and an external power supply, and the power supply circuit is electrically connected with the controller and the external power supply. When the external power supply is connected, the power supply circuit is charged, and after the external power supply is disconnected, the power supply circuit continuously provides voltage for the power-off detection circuit and the controller through discharging, the power-off detection circuit outputs a corresponding detection result to the controller after detecting power off, and the controller performs operations such as gas meter valve closing, data service storage, data transmission and the like according to the detection result; after the power-off detection circuit detects that the external power supply is disconnected and re-connected, the controller performs operations such as valve opening, data service storage, data transmission and the like of the gas meter according to the detection result output by the power-off detection circuit.
The gas meter provided by the invention comprises the power-off detection control circuit, wherein the controller is used for controlling the gas meter to execute a first operation, such as closing a valve, storing gas data, sending power-off information outwards and the like when the power-off detection circuit detects that an external power supply is disconnected, and then entering a power-off protection state, and is used for controlling the gas meter to execute a second operation, such as waking up the gas meter from a dormant state at the moment when the external power supply is reconnected after the power-off detection circuit detects that the external power supply is connected again, starting normal operation, opening the valve, storing related data service, sending power-on information outwards and the like.
In order to make the above objects, features and advantages of the present invention more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 shows an application environment schematic diagram of a gas meter provided by an embodiment of the invention.
Fig. 2 is a block diagram showing connection between a power failure detection control circuit and an external power supply according to an embodiment of the present invention.
Fig. 3 is a schematic circuit connection diagram of a power failure detection control circuit according to an embodiment of the present invention.
Fig. 4 is a schematic diagram showing a circuit connection between an external power supply and a power-off detection control circuit according to an embodiment of the invention.
Icon: 10-a gas meter; 20-an external power source; 30-valve; 100-a power-off detection control circuit; 110-a power-off detection circuit; 120-a power supply circuit; 130-controller.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures. Meanwhile, in the description of the present invention, the terms "first", "second", and the like are used only to distinguish the description, and are not to be construed as indicating or implying relative importance.
Referring to fig. 1, an application environment of a gas meter 10 according to an embodiment of the invention is shown. An external power source 20 is electrically connected to the gas meter 10 for providing a voltage to the gas meter 10. The gas meter 10 is further connected to a valve 30 for controlling the closing or opening of the valve 30, wherein a wired connection or a wireless connection can be adopted between the gas meter 10 and the valve 30. In this embodiment, the gas meter 10 may be used to detect whether a power outage occurs, i.e. whether the external power source 20 is disconnected, and when the power outage is detected, perform a first operation by maintaining the internal discharge voltage for a period of time to perform power outage protection, for example, send a valve closing command to the valve 30 to control the valve 30 to close, send power outage information to the outside, store gas data, etc. In the present embodiment, the external power source 20 is preferably a battery, but is not limited thereto. In addition, when the gas meter 10 detects that the external power source 20 is re-connected (e.g., the user replaces the battery) to implement power-on reset, normal recovery is performed and a second operation is performed, for example, a valve opening command is sent to the valve 30 to control the valve 30 to open, relevant data service is stored, power-on information is sent to the outside, etc.
Referring to fig. 2, a block diagram of a connection between the power-off detection control circuit 100 and the external power source 20 is shown. In this embodiment, the power-off detection control circuit 100 may be applied to the gas meter 10, so that the gas meter 10 can correctly sense the power supply condition of the external power supply 20, and timely process the related measures after power off, so as to ensure the safety performance of the safety switch valve 30 and the data storage of the gas meter 10.
In this embodiment, the power-off detection control circuit 100 includes a power-off detection circuit 110, a power supply circuit 120 and a controller 130, wherein the power-off detection circuit 110 is electrically connected to the power supply circuit 120, the controller 130 and the external power source 20, and the power supply circuit 120 is electrically connected to the controller 130 and the external power source 20.
The power supply circuit 120 is used for charging when the external power supply 20 is connected, and the power supply circuit 120 is also used for discharging when the external power supply 20 is disconnected to provide a discharging voltage for the power-off detection circuit 110 and the controller 130.
In this embodiment, when the external power source 20 is connected, the whole system of the gas meter 10 is also powered while charging and storing energy. When the external power source 20 is disconnected, the power supply circuit 120 starts discharging to supply the discharging voltage to the power-off detection circuit 110 and the controller 130, and supplies power to the whole system as a power source.
The power-off detection circuit 110 is configured to detect whether the external power source 20 is turned off, and output a detection result to the controller 130.
The controller 130 is configured to perform a corresponding operation according to the detection result. Specifically, the controller 130 is configured to control the gas meter 10 to perform a first operation when the power-off detection circuit 110 detects that the external power supply 20 is turned off, and to control the gas meter 10 to perform a second operation when the power-off detection circuit 110 detects that the external power supply 20 is turned on.
In this embodiment, the controller 130 may determine the access condition of the external power supply 20 according to the change of the high and low levels of the detection result output by the power-off detection circuit 110. For example, when the detection result is at a high level, it indicates that the external power supply 20 is turned off, and at this time, the controller 130 controls the gas meter 10 to perform the first operation under the condition that the power supply circuit 120 supplies power, and the gas meter 10 enters a power-off protection state after the first operation is completed; when the detection result is at the low level, it indicates that the external power supply 20 is re-connected, and the gas meter 10 will be awakened at this time, and the controller 130 controls the gas meter 10 to perform the second operation.
As shown in fig. 3, a schematic circuit diagram of the power-off detection control circuit 100 is shown. IN this embodiment, the power outage detection circuit 110 includes a switching tube Q1, a first end of the switching tube Q1 is electrically connected to the external power supply 20, a second end (v_in) of the switching tube Q1 is electrically connected to the power supply circuit 120, and an output end of the switching tube Q1 is electrically connected to the controller 130. Note that, the switching transistor Q1 may be, but is not limited to, a transistor, a field effect transistor, and the like. In this embodiment, the switching tube Q1 is a P-channel field effect tube, where a gate of the P-channel field effect tube is used as a first end of the switching tube Q1, a source of the P-channel field effect tube is used as a second end of the switching tube Q1, and a drain of the P-channel field effect tube is used as an output end of the switching tube Q1.
In this embodiment, the power-off detection circuit 110 further includes a first resistor R1 and a second resistor R2, the first end of the switching tube Q1 is electrically connected to the external power source 20 through the first resistor R1, and the output end of the switching tube Q1 is electrically connected to the controller 130 through the second resistor R2.
Further, the power-off detection circuit 110 further includes a first pull-down resistor R3 and a second pull-down resistor R4, wherein the first pull-down resistor R3 is electrically connected between the first end of the switch tube Q1 and the ground, and the second pull-down resistor R4 is electrically connected between one end of the second resistor R2 and the ground. In this embodiment, the first pull-down resistor R3 is set to avoid suspending the first end (gate) of the switching tube Q1 and interfering with the conduction of the switching tube Q1, and the second pull-down resistor R4 is set to ensure the stability of the signal potential of the input controller 130, so as to avoid the interference of the bypass signal.
IN this embodiment, the power supply circuit 120 includes a super capacitor E1, one end (v_in) of the super capacitor E1 is electrically connected to the second end of the switch tube Q1 and the external power source 20, and the other end of the super capacitor E1 is grounded.
Further, the power supply circuit 120 further includes a diode D1, and the diode D1 is electrically connected between one end of the super capacitor E1 and the external power source 20, and the reverse connection protection is implemented through the unidirectional conductivity of the diode D1, so as to avoid damage to the gas meter 10 when the polarity of the power source is reversed.
Further, the power supply circuit 120 further includes a first capacitor C1 and a second capacitor C2, the first capacitor C1 and the second capacitor C2 are electrically connected between one end of the super capacitor E1 and the ground, and the first capacitor C1 and the second capacitor C2 have functions of filtering and voltage stabilizing.
Further, the power supply circuit 120 further includes a power chip U1, an input end of the power chip U1 is electrically connected to one end of the super capacitor E1, and an output end of the power chip U1 is electrically connected to the controller 130. After the external power supply 20 is connected, the output voltage (for example, 3.7V) of the external power supply 20 supplies power to the power supply chip U1 and charges the super capacitor E1, and the output voltage (for example, 3V) of the power supply chip U1 supplies power to the controller 130. When the external power source 20 is disconnected, the super capacitor E1 starts to discharge, and the power source continues to supply power to the controller 130 and the power failure detection circuit 110. It will be appreciated that in the present embodiment, the output voltage of the power chip U1 is used to supply power to the entire system of the gas meter 10, that is, other modules may be supplied with voltage in addition to the controller 130.
Further, the power supply circuit 120 further includes a third capacitor C3 and a fourth capacitor C4, and the third capacitor C3 and the fourth capacitor C4 are electrically connected between the output end of the power chip U1 and the ground. In this embodiment, the third capacitor C3 and the fourth capacitor C4 are used for filtering and voltage stabilization.
As shown in fig. 4, a schematic circuit diagram of the external power supply 20 and the power-off detection control circuit 100 according to an embodiment of the invention is shown. The input positive electrode of the external power supply 20 is electrically connected to the power-off detection circuit 110 and the power supply circuit 120 via the recoverable fuse F1. In this embodiment, the recoverable fuse F1 has an overcurrent protection function.
In this embodiment, the power-off detection control circuit 100 operates according to the following principle: when the external power supply 20 is normally connected, the super capacitor E1 is charged, and meanwhile, the output voltage of the power supply chip U1 supplies power to the whole system of the gas meter 10, the gas meter 10 is in a normal working state, the first end (gate) of the switching tube Q1 is at a high level, and in a cut-OFF state, the pow_off signal (i.e., the detection result) output by the output end (drain) of the switching tube Q1 is at a low level. When the external power supply 20 is turned OFF, the super capacitor E1 is used as a power supply to continuously supply power to the whole system (including the power-OFF detection circuit 110 and the controller 130), and the first end (gate) of the switching tube Q1 is turned on due to the fact that the external power supply 20 is turned OFF to be at a low level, so that the pow_off signal (i.e. the detection result) output by the switching tube Q1 is at a high level. The controller 130 detects a change in the high-low level of the pow_off signal (i.e., the detection result) output from the switching transistor Q1, thereby determining the connection of the external power supply 20. When the pow_off signal is detected to be at a high level, the external power supply 20 is indicated to be disconnected, and at the moment, the controller 130 continues to work by supplying power through the discharge voltage of the super capacitor E1, so that the gas meter 10 enters a power-OFF protection state after the operations of closing the valve 30, storing data, sending power-OFF information and the like; when the POW_OFF signal is detected to be low, the external power supply 20 is switched on again, the gas meter 10 is powered on for resetting, the valve 30 is opened, related data service is stored, power-on information is sent outwards, and the like.
In summary, the power-off detection control circuit and the gas meter provided by the embodiments of the present invention include a power-off detection circuit, a power supply circuit and a controller, where the power-off detection circuit is electrically connected to the power supply circuit, the controller and an external power supply, and the power supply circuit is electrically connected to the controller and the external power supply. When the external power supply is connected, the power supply circuit is charged, and after the external power supply is disconnected, the power supply circuit continuously provides voltage for the power-off detection circuit and the controller through discharging, the power-off detection circuit outputs a corresponding detection result to the controller after detecting power off, and the controller performs operations such as gas meter valve closing, data service storage, data transmission and the like according to the detection result; after the power-off detection circuit detects that the external power supply is disconnected and re-connected, the controller performs operations such as valve opening, data service storage, data transmission and the like of the gas meter according to the detection result output by the power-off detection circuit. The gas meter can accurately sense the power supply condition of an external power supply, and take relevant countermeasures for the power failure condition, so that the safety switch valve and the safety performance of data storage of the gas meter are ensured, and the situation that the gas meter cannot detect the use of the gas of a user under the power failure condition is avoided, thereby threatening the life and property safety of the user.
It should be noted that in this document, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
Claims (9)
1. The power-off detection control circuit is characterized by comprising a power-off detection circuit, a power supply circuit and a controller, wherein the power-off detection circuit is electrically connected with the power supply circuit, the controller and an external power supply, and the power supply circuit is electrically connected with the controller and the external power supply; the power-off detection circuit comprises a switching tube, a first end of the switching tube is used for being electrically connected with an external power supply, a second end of the switching tube is used for being electrically connected with the power supply circuit, and an output end of the switching tube is used for being electrically connected with the controller; the input positive electrode of the external power supply is respectively and electrically connected with the power-off detection circuit and the power supply circuit through a recoverable fuse;
the power supply circuit is used for charging when an external power supply is connected, and is also used for discharging when the external power supply is disconnected so as to provide discharging voltage for the power-off detection circuit and the controller;
the power-off detection circuit is used for detecting whether an external power supply is disconnected or not and outputting a detection result to the controller;
the controller is used for executing corresponding operation according to the detection result.
2. The power-off detection control circuit according to claim 1, wherein the power-off detection circuit further comprises a first resistor and a second resistor, the first end of the switching tube is electrically connected with an external power supply through the first resistor, and the output end of the switching tube is electrically connected with the controller through the second resistor.
3. The outage detection control circuit of claim 2, further comprising a first pull-down resistor electrically connected between a first end of the switching tube and ground and a second pull-down resistor electrically connected between an end of the second resistor and ground.
4. The power down detection control circuit of claim 1, wherein the power supply circuit comprises a super capacitor, one end of the super capacitor is electrically connected with the second end of the switching tube and an external power supply, and the other end of the super capacitor is grounded.
5. The power down detection control circuit of claim 4, wherein the power supply circuit further comprises a first capacitor and a second capacitor, both of which are electrically connected between one end of the super capacitor and ground.
6. The power down detection control circuit of claim 4, wherein the power supply circuit further comprises a diode electrically connected between one end of the super capacitor and an external power source.
7. The power down detection control circuit of claim 4, wherein the power supply circuit further comprises a power chip, an input terminal of the power chip is electrically connected to one end of the super capacitor, and an output terminal of the power chip is electrically connected to the controller.
8. The power down detection control circuit of claim 7, wherein the power supply circuit further comprises a third capacitor and a fourth capacitor, both of which are electrically connected between the output terminal of the power chip and ground.
9. A gas meter comprising the power-down detection control circuit of any one of claims 1-8, the controller configured to control the gas meter to perform a first operation when the power-down detection circuit detects an external power source disconnection, and to control the gas meter to perform a second operation when the power-down detection circuit detects an external power source access.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710838789.1A CN107634577B (en) | 2017-09-18 | 2017-09-18 | Power-off detection control circuit and gas meter |
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| CN201710838789.1A CN107634577B (en) | 2017-09-18 | 2017-09-18 | Power-off detection control circuit and gas meter |
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| CN107634577B true CN107634577B (en) | 2023-06-27 |
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| CN109546738B (en) * | 2019-01-21 | 2022-02-18 | 成都秦川物联网科技股份有限公司 | Detection device and method for lithium battery standby circuit |
| CN114088154B (en) * | 2020-07-03 | 2023-05-26 | 成都秦川物联网科技股份有限公司 | Photoelectric encoder for intelligent gas meter of Internet of things |
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