CN202678930U - Gas meter power-off protection circuit - Google Patents
Gas meter power-off protection circuit Download PDFInfo
- Publication number
- CN202678930U CN202678930U CN 201220314651 CN201220314651U CN202678930U CN 202678930 U CN202678930 U CN 202678930U CN 201220314651 CN201220314651 CN 201220314651 CN 201220314651 U CN201220314651 U CN 201220314651U CN 202678930 U CN202678930 U CN 202678930U
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- diode
- mcu
- gas meter
- breakover element
- electric capacity
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Abstract
The utility model relates to a gas meter power-off protection circuit which is provided with a valve control module connected with a battery pack, a power-off detection module, and a first diode. The first diode is connected with an MCU of a gas meter. Capacitors are arranged between the first diode and the MCU. The first diode is connected with the capacitors via a cut-off circuit. The capacitors are connected with the MCU via a discharging circuit. The cut-off circuit includes a second diode and a relay which are connected with the first diode. The anode of the second diode is connected with a first switch-on element. The discharging circuit includes a second switch-on element which is connected with the first switch-on element via the input terminal. The switch-on terminal of the second switch-on element is connected with the input terminal of the MCU. The output terminal of the second switch-on element is connected with the output terminal of the MCU and is connected with the ground. When a system is in the power-off station, the back-up capacitors of the gas meter system discharge rapidly, and an external power supply is disconnected with the inside in the discharge process, and after the discharge process, the gas meter power-off protection circuit is connected with the external power supply automatically, and the normal operation of the system is recovered.
Description
Technical field
The utility model relates to protective circuit, is the gas meter, flow meter power-off protecting circuit concretely.
Background technology
Close the function that valve and system enter the power-off protection state when gas meter, flow meter has outage usually at present, system does not do any response to external world to avoid the unstable beyond thought result of appearance of power supply under the power-off protection state.Cut off the power supply moment, system keeps the follow-up work of short time by inner large capacity backup capacitor discharge.The protective circuit of general gas table as shown in Figure 1, under the normal operation feelings, battery pack is charged to large capacity backup capacitor C 1 and C2 by diode D1, and simultaneously MCU is powered.When cutting off the power supply moment; because the unilateal conduction effect of diode D1, backup capacitor C 1 and C2 can discharge to MCU, therefore can guarantee that MCU works on a short time; also can trigger the outage detection module and notify MCU to carry out power-off protection after the outage simultaneously, close valve by MCU control valve control module.Backup capacitor C 1 and C2 power-on time is generally shorter, general discharge off when the user changes new battery, and therefore when the user changes new battery after, system is electrification reset and working successfully.If backup capacitor C 1 and C2 also remain when the user changes new battery certain electric weight is arranged, system then still may be in guard mode behind the replacing battery.And system can not recover normal operation automatically after backup capacitor C 1 and C2 are discharged.
The utility model content
The utility model provides a kind of gas meter, flow meter power-off protecting circuit; behind system cut-off; the internal control system of gas meter, flow meter can make the repid discharge of backup electric capacity after finishing power-off protection; if connect again then and can be forced to disconnect and inner being connected by circuit at the discharge process external power source; after discharge process finishes, automatically reclose external power source, system is normally resumed work.
Gas meter, flow meter power-off protecting circuit of the present utility model, battery pack with minus earth, the positive pole of battery pack is connected with valve control module, outage detection module and the first diode, the negative pole of the first diode is connected with the MCU of gas meter, flow meter, be connected with respectively control line between MCU and described valve control module and the outage detection module, also be connected with the positive pole of the first electric capacity between the first diode and the MCU, the negative pole of the first diode is connected with the first electric capacity through cut off circuit, the first electric capacity is connected with described MCU through the discharge circuit of ground connection, wherein said cut off circuit comprises negative pole and the relay input of the second diode that is connected with the first diode cathode, the positive pole of the second diode is connected output and is connected with relay, the positive pole of the second diode also is connected with the first breakover element of ground connection, the negative pole of the output termination battery pack of the first breakover element; Described discharge circuit comprises that input is connected the second breakover element with described the first breakover element output, and the conduction terminal of the second breakover element connects the input of described MCU, and the output of the second breakover element connects output and the ground connection of MCU.
The normally closed pin of battery pack by relay be to inner system power supply, and the first electric capacity discharges to MCU after by current-limiting resistance and triode.Discharge circuit and cut off circuit in common power-off protecting circuit, have been increased.After MCU detects outage and carries out system protection, set high by the output level with the first breakover element, make the second breakover element conducting, the dump energy of the first electric capacity is released fast by the second breakover element.In the process of releasing, the first breakover element is conducting, if the outside added power supply relay inside and can switch to and often hold pin this moment, thereby cuts off being connected of gas meter, flow meter system and external power source.Until after the first electric capacity released substantially, relay switched to normally closed pin under magneticaction, make follow-up gas meter, flow meter system connect external power source, reply electrification reset.Therefore circuit of the present utility model can not only carry out power-off protection to gas meter, flow meter reliably, autoboot system after outage reliably in the time of can also guaranteeing to access external power source at any time.
Preferably, be provided with the second electric capacity and voltage regulator between the first electric capacity and the MCU, the second electric capacity is located at before the MCU, and voltage regulator is connected between the first capacitance cathode and the second capacitance cathode, and ground connection.The second electric capacity can filter out the clutter of MCU feedback signal, and voltage regulator is be used to the adjusting of carrying out input voltage, such as the cell voltage of input is adjusted to 3.3V etc., whether can select the needs voltage regulator according to actual conditions.
Concrete, described the first breakover element is field effect transistor, missing of described field effect transistor connects the second diode cathode, and source ground, grid connects the battery pack negative pole.
Another kind of selectable scheme is, described the second breakover element is triode, and the base stage of triode is connected with described the first breakover element, and collector and emitter is connected with output with the input of MCU respectively, and with grounded emitter.
Wherein said the first breakover element and the second breakover element also can be all field effect transistor or triode, or other has the element of similar conducting function.
Gas meter, flow meter power-off protecting circuit of the present utility model; after can working as system cut-off; the internal control system of gas meter, flow meter makes the repid discharge of backup electric capacity after finishing power-off protection; in discharge process, can force to disconnect itself and inner being connected to the external power source of access at any time; and after discharge process finishes, can automatically reclose external power source, system is normally resumed work.
Below in conjunction with the embodiment by the accompanying drawing illustrated embodiment, foregoing of the present utility model is described in further detail again.But this should be interpreted as that the scope of the above-mentioned theme of the utility model only limits to following example.Do not breaking away from the above-mentioned technological thought situation of the utility model, various replacements or change according to ordinary skill knowledge and customary means are made all should be included in the scope of the present utility model.
Description of drawings
Fig. 1 is the protective circuit structure chart of general gas table.
Fig. 2 is a kind of structure chart of the utility model gas meter, flow meter power-off protecting circuit.
Embodiment
Gas meter, flow meter power-off protecting circuit of the present utility model has the battery pack of minus earth as shown in Figure 2, and the positive pole of battery pack is connected with valve control module, outage detection module and the first diode D1.The negative pole of the first diode D1 is connected with the MCU of gas meter, flow meter, is connected with respectively control line between MCU and described valve control module and the outage detection module, is connected with jumbo the first capacitor C 1, the second capacitor C 2 and voltage regulator before the MCU.The first capacitor C 1 be connected corresponding connection of both positive and negative polarity of capacitor C 2, voltage regulator is connected between two positive poles of the first capacitor C 1 and the second capacitor C 2, the earth terminal ground connection of voltage regulator.The negative pole of the first diode D1 is connected with capacitor C 1 through cut off circuit, the second capacitor C 2 is connected with described MCU through the discharge circuit of ground connection, wherein said cut off circuit comprises negative pole and the relay K input of the second diode D2 that is connected with the first diode D1 negative pole, the positive pole of the second diode D2 is connected output and is connected with relay K, the positive pole of the second diode D2 also is connected with the first breakover element Q1 of ground connection, the first breakover element Q1 is field effect transistor, missing of described field effect transistor connects the second diode D2 positive pole, source ground, grid connects the battery pack negative pole.Described discharge circuit includes the second breakover element Q2, and the second breakover element Q2 is triode.The base stage of triode is connected with described the first breakover element Q1, and collector and emitter is connected with output with the input of MCU respectively, and with grounded emitter.
After the outage detection module detected outside outage, notice MCU, MCU carried out power-off protection and data storage, and control valve control module is closed gas check valve.After entering the power-off protection state; MCU sets high the discharge node level of the grid output of the first breakover element Q1 of field-effect tube structure; make the second breakover element Q2 conducting of audion, allow the dump energy of the first capacitor C 1 and the second capacitor C 2 release fast by the second breakover element Q2.
If again access external power source in the process of releasing, then relay K inner can switch to pin 5 by pin 5, pin 6 connecting pins 1, pin 6 connects the pin 10 of often holding, and formation is opened circuit, thereby cuts off being connected of gas meter, flow meter follow-up system and external power source.
When the dump energy of the first capacitor C 1 and the second capacitor C 2 release finish after, relay K switches to pin 5, pin 6 connecting pins 1 again under magneticaction, make the gas meter, flow meter system externally can realize electrification reset under the power supply.
Claims (4)
1. gas meter, flow meter power-off protecting circuit, battery pack with minus earth, the positive pole of battery pack is connected with valve control module, outage detection module and the first diode (D1), the negative pole of the first diode (D1) is connected with the MCU of gas meter, flow meter, be connected with respectively control line between MCU and described valve control module and the outage detection module, also be connected with the positive pole of the first electric capacity (C1) between the first diode (D1) and the MCU, it is characterized by: the negative pole of the first diode (D1) is connected through cut off circuit and the first electric capacity (C1) positive pole, the first electric capacity (C1) is connected with described MCU through the discharge circuit of ground connection, wherein said cut off circuit comprises negative pole and relay (K) input of the second diode (D2) that is connected with the first diode (D1) negative pole, the positive pole of the second diode (D2) is connected K with relay) output connect, the positive pole of the second diode (D2) also is connected with first breakover element (Q1) of ground connection, the negative pole of the output termination battery pack of the first breakover element (Q1); Described discharge circuit comprises that input is connected the second breakover element (Q2) with described the first breakover element (Q1) output, the conduction terminal of the second breakover element (Q2) connects the input of described MCU, and the output of the second breakover element (Q2) connects output and the ground connection of MCU.
2. gas meter, flow meter power-off protecting circuit as claimed in claim 1; it is characterized by: be provided with the second electric capacity (C2) and voltage regulator between the first electric capacity (C1) and the MCU; the second electric capacity (C2) is located at before the MCU; voltage regulator is connected between the first electric capacity (C1) positive pole and the second electric capacity (C2) positive pole, and ground connection.
3. gas meter, flow meter power-off protecting circuit as claimed in claim 1 or 2 is characterized by: described the first breakover element (Q1) is field effect transistor, and missing of described field effect transistor connects the second diode (D2) positive pole, source ground, and grid connects the battery pack negative pole.
4. gas meter, flow meter power-off protecting circuit as claimed in claim 1 or 2; it is characterized by: described the second breakover element (Q2) is triode; the base stage of triode is connected with described the first breakover element (Q1); collector and emitter is connected with output with the input of MCU respectively, and with grounded emitter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220314651 CN202678930U (en) | 2012-07-02 | 2012-07-02 | Gas meter power-off protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220314651 CN202678930U (en) | 2012-07-02 | 2012-07-02 | Gas meter power-off protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202678930U true CN202678930U (en) | 2013-01-16 |
Family
ID=47499805
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220314651 Expired - Lifetime CN202678930U (en) | 2012-07-02 | 2012-07-02 | Gas meter power-off protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202678930U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110601518A (en) * | 2019-08-01 | 2019-12-20 | 惠州市德赛西威汽车电子股份有限公司 | Vehicle navigation quick discharge circuit |
-
2012
- 2012-07-02 CN CN 201220314651 patent/CN202678930U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110601518A (en) * | 2019-08-01 | 2019-12-20 | 惠州市德赛西威汽车电子股份有限公司 | Vehicle navigation quick discharge circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: Jiepai Industrial Park in Longquanyi District of Chengdu City, Sichuan province 610505 Chengdu Qinchuan Technology Development Co Ltd Patentee after: CHENGDU QINCHUAN IOT TECHNOLOGY Co.,Ltd. Address before: Jiepai Industrial Park in Longquanyi District of Chengdu City, Sichuan province 610505 Chengdu Qinchuan Technology Development Co Ltd Patentee before: CHENGDU QINCHUAN TECHNOLOGY DEVELOPMENT Co.,Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130116 |