CN212627307U - Power supply circuit of intelligent instrument and intelligent instrument - Google Patents
Power supply circuit of intelligent instrument and intelligent instrument Download PDFInfo
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- CN212627307U CN212627307U CN202021495552.1U CN202021495552U CN212627307U CN 212627307 U CN212627307 U CN 212627307U CN 202021495552 U CN202021495552 U CN 202021495552U CN 212627307 U CN212627307 U CN 212627307U
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Abstract
The embodiment of the utility model discloses power supply circuit of intelligent instrument and have its intelligent instrument relates to thing networking intelligent terminal technical field. The method comprises the following steps: the circuit between the battery and the capacitor is provided with a power supply control protection circuit; the power control protection circuit includes: the electronic switch unit circuit comprises an electronic switch device, wherein a first end of the electronic switch device is connected with the output end of the battery, a second end of the electronic switch device is connected with the input end of the capacitor, and a control end of the electronic switch device is connected with the signal wiring terminal; and the controller is used for controlling the on and off of the electronic switching device according to the set upper and lower threshold voltages. The system can complete the processing of abnormal events such as storage, remote communication, valve closing and the like after the main power of the battery is cut off; and the protection of components of the power circuit can be realized.
Description
Technical Field
The utility model belongs to the technical field of the intelligent instrument technique and specifically relates to a power supply circuit of intelligent instrument and have its intelligent instrument is related to.
Background
In the smart meter industry, such as the gas meter industry. In order to meet the ten-year service life of the product and realize the large power consumption events of remote communication, switching valves and the like of the product, an energy type lithium battery parallel battery capacitor (SPC) is usually selected for power supply. However, in the power supply mode that the lithium battery and the SPC are connected in parallel, the system is immediately and thoroughly powered off after the whole system is unplugged, and the functions of processing abnormal events such as storage, remote communication and the like of products after the main power failure cannot be realized.
SUMMERY OF THE UTILITY MODEL
In view of this, the embodiment of the present invention provides a power circuit of an intelligent instrument and an intelligent instrument having the same, which can at least solve the above technical problems, and after the main power failure of a battery, a system can complete storage, remote communication, valve closing and other abnormal event handling; and the protection of components of the power circuit can be realized.
In order to achieve the above object, a first aspect of the present invention provides a power circuit of an intelligent instrument, including:
the circuit between the battery and the capacitor is provided with a power supply control protection circuit;
the power control protection circuit includes: the electronic switch unit circuit comprises an electronic switch device, wherein a first end of the electronic switch device is connected with the output end of the battery, a second end of the electronic switch device is connected with the input end of the capacitor, and a control end of the electronic switch device is connected with the signal wiring terminal;
the controller is used for controlling the on and off of the electronic switching device according to the set upper and lower threshold voltages.
Optionally, the electronic switching device is an MOS transistor, the first end is a source of the MOS transistor, the second end is a drain of the MOS transistor, and the control end is a gate of the MOS transistor;
the switching unit circuit includes: the drain electrode of the first MOS tube is connected with the source electrode of the second MOS tube, the source electrode of the first MOS tube is connected with the output end of the battery, the drain electrode of the second MOS tube is connected with the input end of the capacitor, and the grid electrodes of the first MOS tube and the second MOS tube are respectively connected onto the signal wiring terminal.
Optionally, the electronic switching device is a triode, a collector of the triode is connected with the output end of the battery, an emitter of the triode is connected with the input end of the capacitor, and a base of the triode is connected to the signal connection terminal.
Optionally, the electronic switch unit circuit further includes an RC switch delay circuit, the RC switch delay circuit includes a first current-limiting resistor and a bypass capacitor, a first end of the first current-limiting resistor is connected to the signal connection terminal, and the other end of the first current-limiting resistor is connected to the control end of the electronic switch device, one end of the bypass capacitor is connected to a circuit node between the first current-limiting resistor and the control end of the electronic switch device, and the other end of the bypass capacitor is grounded.
Optionally, a diode is provided in a circuit between the first terminal of the electronic switching device and the output terminal of the battery.
Optionally, a third MOS transistor is disposed in a circuit between the first end of the electronic switching device and the output end of the battery;
and the source electrode of the third MOS tube is connected with the output end of the battery, and the drain electrode of the third MOS tube is connected with the first end of the electronic switching device.
Optionally, a second current limiting resistor is disposed in a circuit between the second terminal of the electronic switching device and the input terminal of the capacitor.
Optionally, the battery is connected with a battery voltage sampling circuit, and the battery voltage sampling circuit is connected with the controller and used for collecting the battery voltage and sending the battery voltage to the controller.
In a second aspect, a further embodiment of the present invention provides an intelligent instrument, including power supply and power utilization functional module, the power supply includes that the first aspect is arbitrary the power supply circuit, the output of the capacitor in the power supply circuit with the connection of the power utilization functional module, be used for doing the power supply of the power utilization functional module.
Optionally, the smart meter is a gas meter.
The embodiment of the utility model provides a power supply circuit of intelligent instrument and have its intelligent instrument, through setting up battery and condenser SPC separation, after the battery outage, the system can utilize SPC's energy storage to maintain and accomplish abnormal event processing such as storage, remote communication, shut-off valve; therefore, the system can complete the processing of abnormal events such as storage, remote communication, valve closing and the like after the main power supply of the battery is cut off. Moreover, on the basis of setting up battery and SPC separation, add power control protection circuit between the two, can realize the control of lithium cell to SPC charging voltage to avoid the SPC that charging voltage too high brought to burn out the risk of explosion even, and then realize the protection of power supply circuit components and parts.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a circuit block diagram of an embodiment of a power circuit of the intelligent instrument of the present invention;
FIG. 2 is a schematic circuit diagram of another embodiment of the power supply circuit of the smart meter of the present invention;
fig. 3 is a schematic circuit diagram of another embodiment of the power circuit of the smart meter of the present invention;
in fig. 4, the utility model discloses power supply circuit of intelligent instrument is a circuit schematic diagram of another embodiment.
Detailed Description
The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
It should be apparent that numerous technical details are set forth in the following detailed description to provide a more thorough description of the present invention, and it will be apparent to those skilled in the art that the present invention may be practiced without some of these details. In addition, some methods, means, components and applications thereof known to those skilled in the art are not described in detail in order to highlight the gist of the present invention, but the implementation of the present invention is not affected thereby. The embodiments described herein are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
For this reason, the existing circuit designs a power supply circuit with a lithium battery and a battery capacitor (SPC) separated: the lithium battery is separated from the SPC, and a switch circuit is added between the lithium battery and the SPC, so that the lithium battery can control the SPC charging process; meanwhile, after the battery is powered off, the system can complete storage, remote communication, valve closing and other abnormal event processing under the action of SPC.
The embodiment of the utility model provides an intelligent instrument's power supply circuit, have its power and intelligent gas table, through setting up specific charging management circuit, power needs when can satisfying the communication of telecommunication module, also can not influence the normal operating voltage requirement of MCU microprocessor system and other functional circuits when normal communication. Meanwhile, the charging start time of the farad capacitor, the charging duration and the like can be controlled in real time, the intelligent power supply management of the remote communication module is realized, the static power consumption of the communication module can be reduced, and the static power consumption of a product with the communication module is further reduced. This scheme is applicable to and has great restriction to external input power, has remote communication and multifunctional circuit's product again simultaneously, for example intelligent gas table.
Example one
Referring to fig. 1 to 4, an embodiment of the present invention provides a power supply circuit 1 for an intelligent instrument, including: the embodiment of the utility model provides a power supply circuit of intelligent instrument, include: the circuit between the battery and the capacitor is provided with a power supply control protection circuit;
the battery is preferably a rechargeable battery, and comprises a lithium battery, a nickel-cadmium rechargeable battery, a nickel-hydrogen rechargeable battery, a lead accumulator, lithium iron and the like; in the embodiment, a lithium battery is preferably used as the main battery, and more specifically, an energy type ER34615 lithium battery is selected.
The power supply control protection circuit is used for controlling SPC charging voltage by the battery and avoiding SPC explosion risk caused by overhigh charging voltage. It includes: a signal wiring terminal and electronic switch unit circuit for connection director, electronic switch unit circuit includes electronic switch device, electronic switch device's first end with the output of battery is connected, the second end with the input of condenser is connected, the control end with signal wiring terminal connects.
The controller is at least used for controlling the on and off of the electronic switching device according to the set upper and lower threshold voltages so as to cut off the charging current from the battery to the SPC when the SPC charging voltage is too high, and prevent the risk of burning or even explosion of the SPC; when the SPC charging voltage is too low, the working voltage requirement of the meter end electricity utilization functional module cannot be met, and the controller can also disconnect the electronic switch device to cut off the charging current.
Wherein, power consumption functional module includes: electricity utilization functional modules or devices such as communication, valves, controllers and the like; the controller can be a single chip microcomputer generally.
The embodiment of the utility model provides a power supply circuit of intelligent instrument through setting up battery and condenser SPC separation, after the battery outage, the system can utilize SPC's energy storage to maintain and accomplish abnormal event processing such as storage, remote communication, shut valve. Moreover, on the basis of separating the battery from the SPC, a power supply control protection circuit is added between the battery and the SPC, so that the control of the lithium battery on the SPC charging voltage can be realized, the SPC explosion risk caused by overhigh charging voltage is avoided, and the protection of components and parts of the power supply circuit can be realized.
Referring to fig. 2, in some application embodiments, the electronic switching device is a MOSFET (chinese: metal oxide semiconductor field effect transistor, hereinafter, referred to as MOS transistor), and the switching unit circuit is a MOS transistor (hereinafter, referred to as MOS transistor), and the switching unit circuit controls the MOS transistor to be turned on and off by the single chip to control the power circuit.
However, the inventors found that: according to the scheme of taking the MOS tube as the switch unit circuit, although the control of the lithium battery on the SPC charging process can be realized, due to the fact that the parasitic diode exists between the source electrode and the drain electrode of the MOS tube, in the testing or production process, even if the single chip microcomputer can control the MOS tube to be disconnected when power is supplied by misusing higher voltage, leakage current still exists through the parasitic diode, the charging current cannot be completely cut off, namely the scheme cannot effectively control the upper threshold voltage (generally 4.4V, and can also be specifically set according to application scenes), and potential safety hazards of SPC burnout or even explosion still exist.
In addition, when the SPC voltage is higher than that of the lithium battery, the SPC may also reversely charge the lithium battery through the parasitic diode, causing reverse charge of the electric quantity, which has a risk and makes the safety lower.
In order to solve the technical problem in the foregoing solution, referring to fig. 3, as an alternative embodiment, the electronic switching device is an MOS transistor, the first end is a source of the MOS transistor, the second end is a drain of the MOS transistor, and the control end is a gate of the MOS transistor.
The switching unit circuit includes: first MOS pipe Q1 and second MOS pipe Q2, the drain electrode of first MOS pipe Q1 is connected with second MOS pipe Q2's source electrode, first MOS pipe Q1's source electrode with the output of battery is connected, second MOS pipe Q2's drain electrode is connected in condenser C2's input, first MOS pipe Q1 and second MOS pipe Q2's grid connect respectively in on the signal connection terminal to be further used for being connected with controller MCU, in order to receive the on-off control signal that controller MCU sent.
In the embodiment, by reversely connecting the two back-to-back MOS tubes and utilizing the forward conduction and reverse cut-off characteristics of the diodes, the singlechip can effectively and completely cut off the charging current by switching off the switches of the two back-to-back MOS tubes when the SPC charging voltage is too high according to the set upper threshold voltage value, so that the SPC is prevented from being burnt or even exploded due to too high charging voltage; in addition, since the two parasitic diodes are reversely connected, current reverse-sinking can be prevented when the SPC voltage is higher than the battery voltage by using the reverse-blocking characteristic of the diodes. Therefore, the battery, SPC and other devices in the power supply circuit can be effectively protected, and the safety and reliability of the power supply circuit are improved.
The first MOS transistor Q1 and the second MOS transistor Q2 are preferably P-channel MOS transistors.
Referring to fig. 4, in some power application scenarios with lower power consumption control, the electronic switching device is alternatively a transistor, a collector of the transistor is connected to the output terminal of the battery, an emitter of the transistor is connected to the input terminal of the capacitor C2, and a base of the transistor is connected to the signal connection terminal.
It can be understood that, in this embodiment, by adopting the replacement scheme of the triode switch unit circuit, because no parasitic diode exists in the triode, the on-off of the triode can also be controlled by a controller, such as a single chip, so that when the charging voltage exceeds the upper threshold voltage value, the charging current can be completely cut off by turning off the triode, and further, the protection of devices such as a battery and an SPC in the power supply circuit can also be realized.
In addition, the switching unit circuit of the triode is adopted for replacing the circuit, so that the circuit has the advantage of low cost; the disadvantage is that the loading capacity is weaker than that of the MOS tube.
Referring to fig. 2, in another alternative embodiment, the electronic switch unit circuit further includes an RC switch delay circuit, the RC switch delay circuit includes a first current-limiting resistor R1 and a bypass capacitor C1, a first end of the first current-limiting resistor R1 is connected to the signal connection terminal, and the other end of the first current-limiting resistor R1 is connected to the control terminal of the electronic switch device, that is, the gates of the first MOS transistor Q1 and the second MOS transistor Q2, one end of the bypass capacitor C1 is connected to a circuit node between the first current-limiting resistor R1 and the control terminal of the electronic switch device, and the other end of the bypass capacitor C1 is grounded.
With continued reference to fig. 3, a diode D1 is provided in the circuit between the first terminal of the electronic switching device and the output terminal of the battery.
In this embodiment, through increasing diode D1 between the output of battery and electronic switch's first end, utilize diode D1's one-way conductivity can effectively realize preventing the protection of preventing joining conversely, and can prevent the backward pouring of electric quantity when SPC voltage is higher than lithium electricity voltage also.
In an alternative of this embodiment, a third MOS transistor is provided in the circuit between the first terminal of the electronic switching device and the output terminal of the battery, and is used to replace the aforementioned diode.
The source of the third MOS transistor is connected to the output end of the battery, the drain of the third MOS transistor is connected to the first end of the electronic switching device, and the MOS transistor is used to replace the diode D1, so that reverse connection protection can be achieved by using the parasitic diode D1 between the source and the drain of the MOS transistor.
Although the conduction voltage drop of the MOS tube is small, the battery utilization rate of the lithium battery can be improved, the cost is increased, 1 singlechip I/O resource is occupied, and the scheme of circuit topology compared with a diode is complex.
With continued reference to fig. 3, a second current limiting resistor R2 is provided in the circuit between the second terminal of the electronic switching device and the input terminal of the capacitor C2. By adding the second current limiting resistor R2 to the charging loop from the battery to the SPC, the charging current can be prevented from being excessive, thereby enhancing the safety of the power supply circuit.
Specifically, referring to fig. 3, the battery is connected to a battery voltage sampling circuit, and the battery voltage sampling circuit is connected to the controller and configured to collect a battery voltage and send the battery voltage to the controller, so that the controller sends a corresponding level signal to the electronic switch device of the switch unit circuit according to the collected battery voltage value after comparing the collected battery voltage value with a set upper threshold voltage value and a set lower threshold voltage value, and controls the electronic switch device to be turned on and off.
To help understand the technical solution and the technical effect of the embodiment of the present invention, the following is illustrated with reference to fig. 3:
referring to fig. 3, which is a schematic circuit diagram of an embodiment of the power supply circuit of the smart meter according to the present invention, the power supply of the smart meter mainly comprises an ER34615 energy type lithium battery and an SPCI550 battery capacitor C2, so as to supply power to the electricity utilization function module.
A power supply control protection circuit is arranged between the lithium battery and the battery capacitor C2, a signal connection terminal of the power supply control protection circuit is connected to a pin of a controller, the controller is a single chip microcomputer, in this example, the single chip microcomputer sets a lower threshold voltage for controlling the on-off of the electronic switch device to be 3.55, and an upper threshold voltage to be 3.95.
When the battery capacitor C2 needs to be charged, namely when the voltage value of the lithium battery is acquired to be more than 3.55V and less than 3.95V through the battery voltage acquisition circuit, the controller outputs a low-level control signal to the grids of the first MOS tube Q2 and the second MOS tube Q2, the first MOS tube Q1 and the second MOS tube Q2 are in a conducting state, and the lithium battery charges the SPC through the diode D1D1, the two MOSFET tubes and the second current-limiting resistor R2R 2.
Wherein, when lithium cell voltage need be gathered, the singlechip can output high level control signal to first MOS pipe Q1 and second MOS pipe Q2 grid for first MOS pipe Q1 and second MOS pipe Q2 are in the off-state, and the lithium cell no longer charges for SPC, can avoid SPC to cause the influence to lithium cell voltage detection, influence voltage detection's accuracy.
When the voltage value is less than 3.55V, the singlechip output signal output high level is gathered to lithium cell voltage acquisition circuit for first MOS pipe Q1 and second MOS pipe Q2 are in the off-state, because the parasitic diode D1 opposite direction of first MOS pipe Q1 and second MOS pipe Q2, can prevent that the electric current when SPC voltage is higher than lithium cell voltage from flowing backward.
When the voltage value acquired by the lithium battery voltage acquisition circuit is greater than 3.95V, the output of the single chip microcomputer signal MCU-LI-PWR-CTL is at a high level, so that the first MOS tube Q1 and the second MOS tube Q2 are in a cut-off state, and because the parasitic diodes D1 of the first MOS tube Q1 and the second MOS tube Q2 are opposite in direction, the charging current can be completely cut off, and SPC explosion caused by the fact that the SPC charging voltage exceeds 4.4V is prevented.
Example two
Based on the power supply circuit of the intelligent instrument that embodiment a provided, the embodiment of the utility model provides a still provide an intelligent instrument, including power supply and power consumption functional module, power supply includes one or any of embodiment power supply circuit, condenser C2's among the power supply circuit output with power consumption functional module's connection, be used for doing power consumption functional module supplies power.
The intelligent instrument can be a gas meter.
In the constant current source power supply provided by this embodiment, because the power supply circuit of the smart meter described in the first embodiment is provided, after the battery is powered off, the system can maintain and complete the storage, the remote communication, the valve closing and other abnormal event processing by using the stored energy of the SPC. Moreover, in the power supply, the power supply control protection circuit is added between the battery and the capacitor C2, so that the control of the lithium battery on SPC charging voltage can be realized, the SPC explosion risk caused by overhigh charging voltage can be avoided, the protection of components and parts of the power supply circuit can be realized, and the safety and the reliability of the system operation can be improved.
In addition, in this embodiment, based on the description of the first embodiment, other technical effects can be achieved, and according to the functions of the component itself and the components cooperating with other components in the circuit, the technical effects can be obtained through logical reasoning, which is not described herein again.
It should be noted that the terms "upper", "lower", and the like, herein indicate orientations and positional relationships, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; may be directly connected or indirectly connected through an intermediate. Relational terms such as first and third, and the like may be 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. Also, 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 an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element. As will be appreciated by one of ordinary skill in the art, the situation may be specified.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A power supply circuit for a smart meter, comprising: the circuit between the battery and the capacitor is provided with a power supply control protection circuit;
the power control protection circuit includes: the electronic switch unit circuit comprises an electronic switch device, wherein a first end of the electronic switch device is connected with the output end of the battery, a second end of the electronic switch device is connected with the input end of the capacitor, and a control end of the electronic switch device is connected with the signal wiring terminal;
the controller is used for controlling the on and off of the electronic switching device according to the set upper and lower threshold voltages.
2. The power supply circuit of a smart meter according to claim 1, wherein the electronic switching device is an MOS transistor, the first terminal is a source electrode of the MOS transistor, the second terminal is a drain electrode of the MOS transistor, and the control terminal is a gate electrode of the MOS transistor;
the switching unit circuit includes: the drain electrode of the first MOS tube is connected with the source electrode of the second MOS tube, the source electrode of the first MOS tube is connected with the output end of the battery, the drain electrode of the second MOS tube is connected with the input end of the capacitor, and the grid electrodes of the first MOS tube and the second MOS tube are respectively connected onto the signal wiring terminal.
3. A power supply circuit of a smart meter according to claim 1, wherein the electronic switching device is a transistor, a collector of the transistor is connected to the output terminal of the battery, an emitter of the transistor is connected to the input terminal of the capacitor, and a base of the transistor is connected to the signal connection terminal.
4. The power supply circuit of an intelligent instrument according to claim 1, wherein the electronic switch unit circuit further comprises an RC switch delay circuit, the RC switch delay circuit comprises a first current-limiting resistor and a bypass capacitor, a first end of the first current-limiting resistor is connected to the signal connection terminal, the other end of the first current-limiting resistor is connected to the control terminal of the electronic switch device, one end of the bypass capacitor is connected to a circuit node between the first current-limiting resistor and the control terminal of the electronic switch device, and the other end of the bypass capacitor is grounded.
5. A power supply circuit of a smart meter according to claim 1, wherein a diode is provided in the circuit between the first terminal of the electronic switching device and the output terminal of the battery.
6. The power supply circuit of the intelligent instrument according to claim 5, wherein a third MOS transistor is arranged on a circuit between the first end of the electronic switching device and the output end of the battery;
and the source electrode of the third MOS tube is connected with the output end of the battery, and the drain electrode of the third MOS tube is connected with the first end of the electronic switching device.
7. A power supply circuit of a smart meter according to claim 1, wherein a second current limiting resistor is provided in the circuit between the second terminal of the electronic switching device and the input terminal of the capacitor.
8. The power supply circuit of the intelligent instrument according to claim 1, wherein the battery is connected with a battery voltage sampling circuit, and the battery voltage sampling circuit is connected with the controller and used for collecting battery voltage and sending the battery voltage to the controller.
9. An intelligent instrument, characterized by, including power supply and power consumption functional module, power supply includes the power supply circuit of any one of claims 1 to 8, the output of the condenser in the power supply circuit with the connection of power consumption functional module is used for power supply to power consumption functional module.
10. The smart meter of claim 9, wherein the smart meter is a gas meter.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021495552.1U CN212627307U (en) | 2020-07-24 | 2020-07-24 | Power supply circuit of intelligent instrument and intelligent instrument |
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| CN202021495552.1U CN212627307U (en) | 2020-07-24 | 2020-07-24 | Power supply circuit of intelligent instrument and intelligent instrument |
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