CN214205011U - Power supply circuit and flow meter - Google Patents
Power supply circuit and flow meter Download PDFInfo
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- CN214205011U CN214205011U CN202022997238.XU CN202022997238U CN214205011U CN 214205011 U CN214205011 U CN 214205011U CN 202022997238 U CN202022997238 U CN 202022997238U CN 214205011 U CN214205011 U CN 214205011U
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Abstract
The utility model provides a power supply circuit and flowmeter, wherein, power supply circuit includes: the grid electrode of the first switch tube is used for being connected with an external power supply, one of a source electrode and a drain electrode of the first switch tube is connected with the lithium battery, and the other of the source electrode and the drain electrode of the first switch tube is connected with the super capacitor; the first switch tube is configured to: when the voltage of the external power supply is greater than a first reference value, the external power supply is cut off to supply power to the super capacitor; and when the external power supply is less than or equal to the first reference value, the external power supply is conducted so as to supply power to the super capacitor through the lithium battery. The utility model provides a power supply circuit and flowmeter do benefit to and supply power for equipment lasts and steadily.
Description
Technical Field
The utility model relates to a power supply technical field especially relates to a supply circuit and flowmeter.
Background
Super capacitors are a passive device that has been mass produced only in recent years, between batteries and ordinary capacitors. The capacitor has the characteristics of quick large-current charge and discharge of the capacitor, energy storage of the battery and long repeated service life, and electrons between the movable conductors are used for releasing current during discharge, so that a power supply is provided for equipment.
At present, a super capacitor storage battery (also called super storage battery) is often used for a wireless communication circuit to directly supply power to a wireless module. The super-capacitor storage battery is a novel energy storage system combining a storage battery and a super-capacitor, and the system has the advantages of the storage battery and the super-capacitor. In addition, due to the buffering effect of the super capacitor, the accumulation of the sulfate of the storage battery is well inhibited in the high-rate charging and discharging process, the cycle life of the storage battery can be effectively prolonged, the power density is improved, and the application range of the storage battery is further expanded. The combination mode of the storage battery and the super capacitor comprises an external connection mode (namely, the storage battery is a main power supply, the super capacitor is an auxiliary power supply, and the storage battery and the super capacitor are combined into a system in parallel through an additional electronic device) and an internal connection mode (namely, the storage battery and the super capacitor are directly combined into the same system).
However, the super capacitor battery can only use the lithium battery to charge the super capacitor, and if the electric quantity of the lithium battery is used up, the voltage of the super capacitor is reduced, so that the power supply of the wireless communication circuit is abnormal.
SUMMERY OF THE UTILITY MODEL
An embodiment of the utility model provides a power supply circuit and flowmeter for after solving current battery power and run out, lead to super capacitor's voltage reduction, cause the unusual problem of wireless communication circuit power supply.
In order to achieve the above purpose, the utility model provides a following technical scheme:
an aspect of the embodiment of the present invention provides a power supply circuit, including:
a lithium battery and a super capacitor, wherein,
the grid electrode of the first switch tube is used for being connected with an external power supply, one of the source electrode and the drain electrode of the first switch tube is connected with the lithium battery, and the other of the source electrode and the drain electrode of the first switch tube is connected with the super capacitor;
the first switch tube is configured to: when the voltage of the external power supply is larger than a first reference value, the external power supply is cut off so as to supply power to the super capacitor; and when the external power supply is smaller than or equal to a first reference value, the external power supply is conducted so as to supply power to the super capacitor through the lithium battery.
In one possible implementation manner, the first switching tube is a P-type field effect transistor, a drain of the P-type field effect transistor is connected to the lithium battery, and a source of the P-type field effect transistor is connected to the super capacitor.
In one possible implementation manner, the power supply circuit further includes a first resistor, the first resistor is connected in series between the low potential and the gate of the first switch tube, and the first resistor is connected in parallel with the external power source.
In one possible implementation manner, diodes are arranged on a power supply circuit between the lithium battery and the first switching tube, on a control circuit between the external power supply and the gate of the first switching tube, and on a power supply circuit between the gate of the first switching tube and the super capacitor.
In one possible implementation manner, feedback adjusting modules are arranged on the external power supply and the power supply circuit of the super capacitor, the feedback adjusting modules have preset values, and the feedback adjusting modules are used for controlling the external power supply to stop supplying power to the super capacitor when the voltage of the super capacitor is greater than the preset value.
In one possible implementation, the feedback adjusting module includes a sampling circuit and a switching circuit;
the sampling circuit is used for acquiring the voltage value of the super capacitor;
the switch circuit is arranged on the external power supply and the power supply circuit of the super capacitor and connected with the sampling circuit, and the switch circuit is cut off when the voltage of the super capacitor acquired by the sampling circuit is greater than a preset value, so that the external power supply stops supplying power to the super capacitor.
In one possible implementation manner, the switching circuit includes a second switching tube and a third switching tube connected in series, the sampling circuit is connected to a gate of the second switching tube and a gate of the third switching tube, respectively, a drain of the second switching tube is connected to the external power supply, and a source of the third switching tube is connected to the super capacitor.
In one possible implementation manner, the sampling circuit includes a sampling chip and a conversion chip, the sampling chip is provided with a preset value, and the conversion chip is connected in series between a signal output end of the sampling chip and a control end of the switch circuit;
and when the voltage of the super capacitor is greater than a preset value, the conversion chip outputs a second reference value to enable the external power supply to stop supplying power to the super capacitor.
In one possible implementation manner, two sampling chips are provided, and the two sampling chips are arranged in parallel.
In one possible implementation manner, the power supply circuit further includes a second resistor, the second resistor is connected in series between the low potential and the output terminal of the sampling circuit, and the second resistor is connected in parallel with the control terminal of the switching circuit.
A flow meter comprising a wireless communication device, a valving system, and a power supply circuit as described above for powering the wireless communication device and/or the valving system.
The utility model provides a power supply circuit and a flowmeter, which are provided with a first switch tube and cut off when the voltage of an external power supply is greater than a first reference value, so as to supply power for a super capacitor through the external power supply; switch on when external power source is less than or equal to first benchmark value to supply power for super capacitor through the lithium cell, make and wait charging device and can be continuously charged, just can avoid current single lithium cell power supply of adoption, cause the unusual condition of wireless communication circuit power supply to take place, do benefit to wireless communication circuit's continuous power supply and stable.
In addition to the technical problems, technical features constituting technical aspects, and advantageous effects brought by the technical features of the technical aspects described above, other technical problems, technical features included in technical aspects, and advantageous effects brought by the technical features that can be solved by the embodiments of the present invention will be described in further detail in the detailed description.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is an overall circuit schematic diagram of a power supply circuit according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a part of a power supply circuit according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of another part of a power supply circuit according to an embodiment of the present invention.
Description of reference numerals:
1. an external power supply;
2. a lithium battery;
3. a super capacitor;
4. a first switch tube;
5. a sampling circuit; 51. sampling a chip; 52. converting the chip;
6. a switching circuit; 61. a second switching tube; 62. a third switching tube;
7. a first ground circuit; 71. a first resistor;
8. a second ground circuit; 81. a second resistor;
91. a first diode; 92. a second diode; 93. and a third diode.
With the above figures, certain embodiments of the present invention have been shown and described in more detail below. The drawings and the description are not intended to limit the scope of the inventive concept in any way, but rather to illustrate the inventive concept by those skilled in the art with reference to specific embodiments.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention.
Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention. The embodiments described below and the features of the embodiments can be combined with each other without conflict.
Example one
Fig. 1 is the overall circuit schematic diagram of a power supply circuit provided by an embodiment of the present invention, fig. 2 is a circuit schematic diagram of a part of a power supply circuit provided by an embodiment of the present invention, as shown in fig. 1 and fig. 2, a power supply circuit includes a lithium battery 2, a super capacitor 3 and a first switch tube 4. The grid electrode of the first switch tube 4 is connected with the external power supply 1, one of the source electrode and the drain electrode of the first switch tube 4 is connected with the lithium battery 2, and the other of the source electrode and the drain electrode of the first switch tube 4 is connected with the super capacitor 3;
the first switching tube 4 is configured to: when the voltage of the external power supply 1 is greater than a first reference value, the external power supply 1 is cut off to supply power to the super capacitor 3; and when the external power supply 1 is less than or equal to the first reference value, the external power supply is conducted so as to supply power to the super capacitor 3 through the lithium battery 2. Super capacitor 3
It should be noted that the supercapacitor 3 is an electrochemical element that stores energy by polarizing an electrolyte. It is different from traditional chemical power source, and is a power source with special performance between traditional capacitor and battery, and mainly depends on electric double layer and redox pseudo-capacitor charge to store electric energy. Its structure is similar to a plate capacitor, its electrodes are made of porous carbon-based material, the porous structure of the material makes its surface area per gram weight reach thousands of square meters, and the distance of separation of capacitor charges is determined by the size of ions in electrolyte. The huge surface area and the extremely small distance between charges enable the super capacitor 3 to have a large capacity, and the capacity of the super capacitor 3 monomer can vary from farads to thousands of farads. Compared with the traditional battery, the super capacitor 3 has the advantages of high charging speed, high power density, strong heavy current discharging capability, more recycling times, long service life, high safety coefficient and the like.
As shown in fig. 2, the embodiment of the present invention provides a power supply circuit, in which a lithium battery 2 and an external power supply 1 are connected in parallel to an input terminal of a super capacitor 3. A first charging loop is formed between the external power supply 1 and the super capacitor 3, and a second charging loop is formed between the lithium battery 2 and the super capacitor 3. The first charging circuit and the second charging circuit are both connected with the first switch tube 4. At the same time, only one charging loop is turned on. That is, at the same time, the first switch tube 4 can only select one of the lithium battery 2 and the external power supply 1 to charge the super capacitor 3. The external power supply 1 outputs an output voltage Vc. The first switch tube 4 receives the output voltage Vc, compares the output voltage Vc with a first reference value, and outputs a control command to control the on/off of the second charging loop.
The utility model provides a power supply circuit, through setting up the first switch tube 4, make the voltage of external power source 1 greater than the first reference value when this first switch tube 4 is cut off, in order to supply power for super capacitor 3 through external power source 1; this first switch tube 4 switches on when external power source 1 is less than or equal to first benchmark value to supply power for super capacitor 3 through lithium cell 2, make and treat charging device and can be continuously charged, just can avoid current single lithium cell 2 power supply of adoption, cause the unusual condition of wireless communication circuit power supply to take place, do benefit to wireless communication circuit's continuous power supply and stability.
The kind of the device for supplying power to the super capacitor 3 may be the above-mentioned lithium battery 2, the external power source 1, or a storage battery such as a lead-acid battery. Wherein, the external power supply outputs direct current. In the embodiment, the lithium battery 2 and the external power source 1 are taken as examples, and for other power supply types of power supply circuits, those skilled in the art can derive the power supply circuits simply, and details are not described herein again.
In addition, the number of devices for supplying power to the super capacitor 3 may be two or more than two. Exemplarily, fig. 2 illustrates that only the external power source 1 and the lithium battery 2 supply power to the super capacitor 3, and as shown in fig. 2, the external power source 1 and the lithium battery 2 supply power to the super capacitor 3 according to priority. When the external power supply 1 is not connected to the first charging loop, the first switching tube 4 can control the second charging loop to be conducted, so that the lithium battery 2 charges the super capacitor 3; when the external power supply 1 is connected to the first charging circuit, the first switch tube 4 can control the second charging circuit to be disconnected, so that only the external power supply 1 charges the super capacitor 3.
As another example, the number of devices for supplying power to the super capacitor 3 may be three, and the external power source 1, the lithium battery 2 and other batteries may be provided. The other cell may be a secondary cell. Namely, a storage battery is added on the basis of the previous example, and the charging loop where the other batteries are located is called as a third charging loop. At this time, the first switching tube 4 is provided with two, and one of the first switching tubes 4 may be provided with reference to the above example. The grid electrode of the other switch tube is used for being connected with the lithium battery 2, one of the source electrode and the drain electrode of the first switch tube 4 is connected with the other battery, and the other of the source electrode and the drain electrode of the first switch tube 4 is connected with the super capacitor 3. Thus, the external power source 1, the lithium battery 2, and other batteries have priority of power supply therebetween. Only when the external power supply 1 is not connected to the first charging circuit and the lithium battery 2 is not connected to the second charging circuit, the first switch tube 4 can control the third charging circuit to be conducted, so that other batteries charge the super capacitor 3.
It should be noted that the number of devices for supplying power to the super capacitor 3 may also exceed three, and a plurality of power supply devices may set the priority level with reference to the above, so as to charge the super capacitor 3 step by step. The number and types of the devices shown in fig. 2 for supplying power to the super capacitor 3 are shown below as an example, that is, only the external power source 1 and the lithium battery 2 supply power to the super capacitor 3, and for setting more than two power supply devices, the following simple derivation may be referred to, and details are not repeated here.
In fig. 2, the first switch tube 4 is a P-type field effect transistor, a gate of the first switch tube 4 is connected to the external power supply 1, a drain of the first switch tube 4 is connected to the lithium battery 2, and a source of the first switch tube 4 is connected to the super capacitor 3.
That is, the gate of the first switch tube 4 receives the output voltage Vc, the source of the first switch tube 4 has a first reference value, and when the output voltage Vc is greater than or equal to the first reference value, the source and the drain of the first switch tube 4 are disconnected. The source and drain of the first switch tube 4 are part of the second charging circuit, so the second charging circuit is disconnected, and only the external power supply 1 charges the super capacitor 3.
In addition, when the output voltage Vc is smaller than the first reference value, the source and the drain of the first switch tube 4 are turned on. The second charging loop is conducted, and only the lithium battery 2 charges the super capacitor 3.
In addition, the first switch tube 4 can also be an N-type field effect transistor or a triode. When the N-type fet is selected, the circuit at the first switching transistor 4 needs to be redesigned. For example, when the first switch tube 4 is an N-type fet, the gate of the first switch tube 4 may be connected to the external power source 1, the source of the first switch tube 4 may be connected to the super capacitor 3, and the drain of the first switch tube 4 may be connected to the lithium battery 2. An inverter can be connected between the gate of the first switch tube 4 and the external power supply 1 in series. The inverter may be a not gate. Thus, when the external power supply 1 is connected to the first charging loop, the output voltage Vc is at a high level and becomes a low level after passing through the not gate. The grid electrode of the first switch tube 4 is at a low level, the source electrode and the drain electrode of the first switch tube 4 are cut off, the second charging loop is disconnected, and only the external power supply 1 supplies power to the super capacitor 3. When the first switch tube 4 is a transistor, the transistor is used as a switch.
Optionally, as shown in fig. 2, the power supply circuit further includes a first grounding circuit 7, and the first grounding circuit 7 is connected in parallel with the gate of the first switch tube 4. When the external power supply 1 is connected into the first charging loop, the conducting wire in the first charging loop may generate voltage due to inductance effect, and the first grounding circuit 7 is arranged to pull down the voltage to obtain a known low level so as to ensure the uniqueness of charging the super capacitor 3 by the lithium battery 2.
The first grounding circuit 7 can pull down the partial voltage in a voltage sharing manner by adding a load. Fig. 2 illustrates an example in which a load is a first resistor 71, and as shown in fig. 2, one end of the first resistor 71 is connected to a connection node between the output terminal of the external power source 1 and the first switching tube 4, and the other end of the first resistor 71 can be connected to ground or a low potential.
Optionally, a first diode 91 is provided between the external power source 1 and the first switch tube 4 for preventing the super capacitor 3 from supplying power reversely. Illustratively, as shown in fig. 2, an anode of the first diode 91 is connected to the output terminal of the external power supply 1, and a cathode of the first diode 91 is connected to the gate of the first switching tube 4. So that the current of the first charging loop can only flow from the external power source 1 to the super capacitor 3.
Optionally, as shown in fig. 2, the anode of the second diode 92 is connected to the first switching tube 4, and the cathode of the second diode 92 is connected to the input end of the super capacitor 3, so as to further avoid the reverse flow of current.
Likewise, optionally, as shown in fig. 2, an anode of the third diode 93 is connected to the output terminal of the lithium battery 2, and a cathode of the third diode 93 is connected to the drain of the first switching tube 4, so that current can only flow from the lithium battery 2 to the super capacitor 3.
For convenience of description, the voltage when the super capacitor 3 is fully charged is 3.7V, the rated output voltage of the external power supply 1 is V, and the rated output voltage of the lithium battery 2 is 3.6V. In order to avoid the current reversal, the rated output voltage of the lithium battery 2 is set to be lower than the voltage at the time of full charge of the supercapacitor 3. A voltage drop is arranged between the external power supply 1 and the super capacitor 3, so that the V voltage of the external power supply 1 is changed into 3.7V to the super capacitor 3 through the voltage drop. In addition, the external power supply 1 adopts an external power supply for power supply, and the rated output voltage is V, which is greater than 3.7V. Therefore, in the process that the external power supply 1 charges the super capacitor 3, when the voltage of the super capacitor 3 does not reach 3.7V, the external power supply 1 continuously supplies power to the super capacitor 3; if the voltage of the super capacitor 3 exceeds 3.7V, the first switch tube 4 needs to control the external power supply 1 so that the super capacitor 3 is no longer powered.
Fig. 3 is another part of the circuit schematic diagram of the super capacitor 3 battery provided by the embodiment of the present invention, as shown in fig. 1 and fig. 3, a feedback adjusting module is provided on the power supply circuit of the external power source 1 and the super capacitor 3, the feedback adjusting module has a preset value, and the feedback adjusting module is used for controlling the external power source 1 to stop supplying power to the super capacitor 3 when the voltage of the super capacitor 3 is greater than the preset value.
The feedback regulation module comprises a sampling circuit 5 and a switch circuit 6. The sampling circuit 5 is used for collecting the voltage value of the super capacitor 3. The switch circuit 6 is arranged on the power supply circuits of the external power supply 1 and the super capacitor 3 and is connected with the sampling circuit 5, and the switch circuit 6 is cut off when the voltage of the super capacitor 3 collected by the sampling circuit 5 is greater than a preset value, so that the external power supply 1 stops supplying power to the super capacitor 3.
The sampling circuit 5 is capable of comparing the input voltage Vo of the super capacitor 3 with a preset value. When the input voltage Vo of the super capacitor 3 is greater than a preset value, the switching circuit 6 is used for disconnecting the charging loop; when the input voltage Vo of the super capacitor 3 is less than or equal to a preset value, the switch circuit 6 is used for conducting the charging loop.
That is, the super-pole capacitor in fig. 3 has an input voltage Vo, and the switching circuit 6 receives the input voltage Vo, compares the input voltage Vo with a preset value, and outputs the comparison value to the first switching element. And the switch circuit 6 receives the comparison value and controls the on-off of the first charging loop.
Illustratively, the sampling circuit 5 includes a sampling chip 51. When the sampling chip 51 is used for comparing the input voltage Vo of the super capacitor 3 with the preset value of 3.7V, the sampling chip 51 may be a chip of BD4937 model. When the voltage at the input end of the chip, namely the input voltage Vo of the super capacitor 3, is less than or equal to 3.7V, the chip outputs a low level; when the voltage at the input end of the chip, namely the input voltage Vo of the super capacitor 3 is more than 3.7V, the chip outputs high level.
Since the high level and the low level output by the sampling chip 51 cannot be directly judged by the switch circuit 6, the sampling circuit 5 further includes a conversion chip 52, and the conversion chip 52 is connected in series with the sampling chip 51 so as to convert the output signal of the sampling chip 51 into the signal that can be received by the switch circuit 6. In fig. 3, the conversion chip 52 is exemplified by a chip with a 74LVC14 model, when the sampling chip 51 outputs a low level, the conversion chip 52 outputs a low level, and the switch circuit 6 can receive the low level output by the conversion chip 52 and make the first charging loop be turned on; when the sampling chip 51 outputs a high level, the conversion chip 52 outputs a high level, and the switch circuit 6 can receive the high level output by the conversion chip 52 and disconnect the first charging loop.
Alternatively, two sampling chips 51 may be provided so that when one of the sampling chips 51 is damaged, the other sampling chip can continue to operate to extend the service life of the composite power supply device. Two sampling chips 51 may be connected in parallel between the input of the super capacitor 3 and the switching circuit 6.
Optionally, the power supply circuit further includes a second grounding circuit 8, and the second grounding circuit 8 is connected to the output end of the sampling circuit 5 in parallel with the switch circuit 6, so as to pull down the high level when the sampling circuit 5 outputs the high level. That is, when the input voltage Vo of the super capacitor 3 is greater than the preset value (3.7V), the sampling circuit 5 outputs a high level, and the second grounding circuit 8 is turned on.
The second grounding circuit 8 can pull down the part of high level in a voltage sharing manner by additionally arranging a load. Fig. 3 illustrates that the load is the second resistor 81, as shown in fig. 3, one end of the second resistor 81 is connected to the connection node between the output terminal of the converting chip 52 and the switch circuit 6, and the other end of the second resistor 81 can be connected to ground or a low potential.
Optionally, the sampling circuit 5 further includes a fourth diode, an anode of the fourth diode is connected to the output terminal of the conversion chip 52, and a cathode of the fourth diode is connected to the switching circuit 6, so that a current flows from the sampling circuit 5 to the switching circuit 6.
Continuing with fig. 3, sampling circuit 5 outputs the comparison value and switching circuit 6 sets the second reference value. When the comparison value is less than or equal to the second reference value, the switch circuit 6 switches on the first charging loop; when the comparison value is greater than the second reference value, the switching circuit 6 turns off the first charging circuit.
Optionally, the switch circuit 6 includes a second switch tube 61, and the second switch tube 61 may be a P-type field effect transistor. The grid electrode of the second switch tube 61 is connected with the output end of the sampling circuit 5; the drain electrode of the second switch tube 61 is connected with the external power supply 1; the source of the second switch tube 61 is connected to the super capacitor 3.
That is, the output terminal of the sampling circuit 5 outputs the comparison value, the gate of the second switch tube 61 receives the comparison value, the source of the second switch tube 61 is set with the second reference value, and when the comparison value is smaller than the second reference value, the source and the drain of the second switch tube 61 are turned on. The source and drain of the second switch tube 61 are part of the first charging circuit, so that the first charging circuit is turned on and the external power source 1 charges the super capacitor 3.
In addition, when the comparison value is greater than or equal to the second reference value, the source and the drain of the second switching tube 61 are turned off. The first charging circuit is disconnected and the external power supply 1 no longer charges the super capacitor 3.
In addition, the second switch 61 may also be an N-type fet or a triode. When the second switch tube 61 can be an N-type fet, the circuit at the switch circuit 6 needs to be redesigned, and those skilled in the art can easily derive the redesigned circuit according to the above description, and will not be described herein again. When the second switching tube 61 is a transistor, the transistor is used as a switch.
Optionally, the switching circuit 6 further includes a third switching tube 62. The second switch tube 61 and the third switch tube 62 are connected in series. Illustratively, the drain of the second switching tube 61 is connected to the source of the third switching tube 62, and the gate of the second switching tube 61 and the gate of the third switching tube 62 are respectively connected to the output terminal of the sampling circuit 5. That is, the gate of the second switching tube 61 is connected to the output terminal of the sampling circuit 5, and the gate of the third switching tube 62 is connected to the connection node between the gate of the second switching tube 61 and the output terminal of the sampling circuit 5. So that the third switch tube 62 can continue to work when the grid of the second switch tube 61 is damaged, thereby prolonging the service life of the device.
Example two
A flow meter includes a wireless communication device, a valve control system, and a power supply circuit as provided in the above embodiments that supplies power to the wireless communication device and/or the valve control system. The wireless communication device refers to one or more electronic components such as a controller for controlling the valve body. The valve control system refers to one or more valve bodies for regulating the flow rate (or pressure) of liquid (or gas), or the like.
In addition, the power supply circuit can be electrically connected with one of the wireless communication device and the valve control system, and the power supply circuit can also be electrically connected with the wireless communication device and the valve control system respectively.
The terms "upper" and "lower" are used to describe relative positions of the structures in the drawings, and are not used to limit the scope of the present invention, and the relative relationship between the structures may be changed or adjusted without substantial technical changes.
It should be noted that: in the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
Furthermore, in the present disclosure, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral part; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the description herein, reference to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (11)
1. A power supply circuit, comprising:
a lithium battery and a super capacitor, wherein,
the grid electrode of the first switch tube is used for being connected with an external power supply, one of the source electrode and the drain electrode of the first switch tube is connected with the lithium battery, and the other of the source electrode and the drain electrode of the first switch tube is connected with the super capacitor;
the first switch tube is configured to: when the voltage of the external power supply is larger than a first reference value, the external power supply is cut off so as to supply power to the super capacitor; and when the external power supply is smaller than or equal to a first reference value, the external power supply is conducted so as to supply power to the super capacitor through the lithium battery.
2. The power supply circuit according to claim 1, wherein the first switch tube is a P-type field effect transistor, a drain of the P-type field effect transistor is connected to the lithium battery, and a source of the P-type field effect transistor is connected to the super capacitor.
3. The power supply circuit according to claim 1, further comprising a first resistor connected in series between a low potential and the gate of the first switching tube, and connected in parallel with the external power source.
4. The power supply circuit according to claim 1, wherein diodes are disposed on the power supply circuit between the lithium battery and the first switching tube, on the control circuit between the external power source and the gate of the first switching tube, and on the power supply circuit between the gate of the first switching tube and the super capacitor.
5. The power supply circuit according to any one of claims 1-4, wherein a feedback regulation module is disposed on the external power source and the power supply circuit of the super capacitor, the feedback regulation module has a preset value, and the feedback regulation module is configured to control the external power source to stop supplying power to the super capacitor when the voltage of the super capacitor is greater than the preset value.
6. The power supply circuit of claim 5, wherein the feedback regulation module comprises a sampling circuit and a switching circuit;
the sampling circuit is used for acquiring the voltage value of the super capacitor;
the switch circuit is arranged on the external power supply and the power supply circuit of the super capacitor and connected with the sampling circuit, and the switch circuit is cut off when the voltage of the super capacitor acquired by the sampling circuit is greater than a preset value, so that the external power supply stops supplying power to the super capacitor.
7. The power supply circuit according to claim 6, wherein the switching circuit comprises a second switching tube and a third switching tube which are connected in series, the sampling circuit is respectively connected with a grid electrode of the second switching tube and a grid electrode of the third switching tube, a drain electrode of the second switching tube is connected with the external power supply, and a source electrode of the third switching tube is connected with the super capacitor.
8. The power supply circuit according to claim 6, wherein the sampling circuit comprises a sampling chip and a conversion chip, the sampling chip is provided with a preset value, and the conversion chip is connected in series between a signal output end of the sampling chip and a control end of the switching circuit;
and when the voltage of the super capacitor is greater than a preset value, the conversion chip outputs a voltage higher than a second reference value so that the external power supply stops supplying power to the super capacitor.
9. The power supply circuit of claim 8, wherein there are two sampling chips, and the two sampling chips are arranged in parallel.
10. The power supply circuit of claim 6, further comprising a second resistor connected in series between a low potential and the output of the sampling circuit, and connected in parallel with the control terminal of the switching circuit.
11. A flow meter comprising a wireless communication device, a valving system, and the power supply circuit of any of claims 1-10 for powering the wireless communication device and/or the valving system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022997238.XU CN214205011U (en) | 2020-12-11 | 2020-12-11 | Power supply circuit and flow meter |
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| CN202022997238.XU CN214205011U (en) | 2020-12-11 | 2020-12-11 | Power supply circuit and flow meter |
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