CN218412701U - Power supply circuit of electric energy meter communication module and electric energy meter - Google Patents
Power supply circuit of electric energy meter communication module and electric energy meter Download PDFInfo
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- CN218412701U CN218412701U CN202221936614.7U CN202221936614U CN218412701U CN 218412701 U CN218412701 U CN 218412701U CN 202221936614 U CN202221936614 U CN 202221936614U CN 218412701 U CN218412701 U CN 218412701U
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Abstract
The application discloses power supply circuit and electric energy meter of electric energy meter communication module has improved the power supply reliability of electric energy meter communication module's power supply circuit. The power supply circuit includes: a controllable switch circuit K1 and a dual power supply circuit 100; the dual-power supply circuit 100 includes a first input branch, a second input branch, and an output branch, where one end of the three branches is connected to form a point O1; the other end of the first input branch is connected with one end of the controllable switch circuit K1, and the other end of the controllable switch circuit K1 is used for connecting a battery VBO; the control end of the controllable switch circuit K1 is used for connecting one pin IR _ FAR _ PWR of the electric energy meter control unit; the other end of the second input branch is connected with a VCC voltage pin; and the other end of the output branch is used for connecting a power supply end VBB _ IP of the electric energy meter communication module.
Description
Technical Field
The utility model relates to a power electronic technology field, more specifically say, relate to a power supply circuit and electric energy meter of electric energy meter communication module.
Background
The electric energy meter is internally provided with a communication module (for example, an infrared communication module), and the electric energy meter is communicated with an electric energy acquisition terminal (for example, an infrared meter reading palm machine) and the like through the communication module, as shown in fig. 1.
The existing power circuit design of the electric energy meter communication module is shown in fig. 2: the power supply end of the electric energy meter communication module is simultaneously connected with a battery and a VCC voltage pin (VCC voltage refers to power supply voltage obtained from a power grid, and the power grid voltage is converted into voltage transformation, rectification and the like). However, in this way, when the battery is low and the power grid is powered off, the communication module of the electric energy meter loses power supply, so that the electric energy meter cannot continue to communicate with the electric energy collecting terminal.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a power supply circuit and electric energy meter of electric energy meter communication module to improve electric energy meter communication module's power supply reliability of power supply circuit.
A power circuit of a communication module of an electric energy meter comprises: a controllable switch circuit K1 and a dual power supply circuit 100;
the dual-power supply circuit 100 includes a first input branch, a second input branch, and an output branch, where one end of the three branches is connected to a point, i.e. a common end O1;
the other end of the first input branch is connected with one end of the controllable switch circuit K1, and the other end of the controllable switch circuit K1 is used for connecting a battery VBO;
the control end of the controllable switch circuit K1 is used for connecting one pin IR _ FAR _ PWR of the electric energy meter control unit;
the other end of the second input branch is connected with a VCC voltage pin;
and the other end of the output branch is used for connecting a power supply end VBB _ IP of the electric energy meter communication module.
Optionally, the dual power supply circuit 100 further includes a module for filtering, stabilizing and limiting a power end signal of the communication module of the electric energy meter.
Optionally, the module in the dual power supply circuit 100 for performing current limiting processing on the power end signal of the communication module of the electric energy meter includes: a current limiting resistor R127;
the current limiting resistor R127 is connected in series on the output branch.
Optionally, the module in the dual power supply circuit 100 for filtering the power end signal of the communication module of the electric energy meter includes: a filter capacitor CP1;
one end of the filter capacitor CP1 is connected with the common end O1 of the first input branch, the second input branch and the output branch, and the other end is grounded.
Optionally, the module in the dual power supply circuit 100 for performing voltage stabilization processing on the power end signal of the communication module of the electric energy meter includes: a voltage stabilizing capacitor C61;
one end of the voltage-stabilizing capacitor C61 is used for connecting a power supply end VBB _ IP of the electric energy meter communication module, and the other end is grounded.
Optionally, the second input branch is further connected in series with a voltage reduction circuit VD3.
Optionally, the voltage reduction circuit VD3 is a voltage reduction circuit formed by parallel connection of double diodes.
Optionally, in the power supply circuit of any one of the electric energy meter communication modules, the controllable switch circuit K1 includes: an N-type switch tube Q6, a P-type switch tube Q7, a first resistor R27, a second resistor R28 and a third resistor R94;
the control electrode of the N-type switching tube Q6 is connected to one end of the first resistor R27, and the other end of the first resistor R27 is used as the control end of the controllable switching circuit K1;
the electric energy input pole of the N-type switching tube Q6 is connected with the control pole of the P-type switching tube Q7 through a second resistor R28;
the electric energy output electrode of the N-type switching tube Q6 is grounded and is connected with the control end of the controllable switching circuit K1 through a third resistor R94;
the electric energy input electrode of the P-type switching tube Q7 is used for receiving battery voltage;
the electric energy output electrode of the P-type switch tube Q7 is connected with a dual-power supply circuit 100.
An electric energy meter comprising: the electric energy meter communication module and the power circuit of any one of the electric energy meter communication modules disclosed above.
Optionally, the electric energy meter communication module is an infrared communication module.
According to the above technical scheme, the utility model discloses a power supply circuit of electric energy meter communication module has realized that battery output voltage is controllable through establishing ties controllable switch circuit K1 at the battery output. The control logic of the electric energy meter control unit to the controllable switch circuit K1 is preset by a worker, so that the controllable switch circuit K1 can be disconnected when the electric energy meter normally works, the VCC voltage supplies power to the electric energy meter communication module, and the electric quantity of a battery is not consumed; the controllable switch circuit K1 is closed when the power grid is powered off, the battery supplies power to the electric energy meter communication module, and the electric quantity of the battery begins to be consumed after the power grid is powered off, so that the electric quantity of the battery is sufficient at the moment of power grid power off, and the electric energy meter communication module can be supported to continuously work for a long time. Compared with the prior art, the utility model discloses this power supply circuit's power supply reliability has obviously been improved.
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 these drawings without creative efforts.
Fig. 1 is a schematic diagram of an electric energy meter and an electric energy collecting terminal in communication according to the prior art;
FIG. 2 is a schematic diagram of a power circuit of a communication module of an electric energy meter according to the prior art;
fig. 3 is a schematic diagram of a power circuit of a communication module of an electric energy meter according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a power circuit of another electric energy meter communication module according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of the voltage regulator circuit of the power circuit of FIG. 4 using a voltage reduction circuit;
FIG. 6 is a schematic diagram of the voltage-reducing circuit in the power circuit shown in FIG. 5, wherein the voltage-reducing circuit is formed by connecting two diodes in parallel;
fig. 7 is a schematic diagram of a controllable switch circuit K1 in the power circuit shown in fig. 6.
Detailed Description
For reference and clarity, the terms, abbreviations or abbreviations used hereinafter are summarized as follows:
MOSFET: metal-Oxide-semiconductor field-Effect Transistor (MOSFET);
IGBT: an Insulated Gate Bipolar Transistor;
MCU: micro Control Unit, micro Control Unit.
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.
Referring to fig. 3, the embodiment of the utility model discloses power supply circuit of electric energy meter communication module, include: a controllable switch circuit K1 and a dual power supply circuit 100;
the dual-power supply circuit 100 includes a first input branch, a second input branch, and an output branch, where one end of the three branches is connected to form a point, i.e., a common end O1;
the other end of the first input branch is connected with one end of a controllable switch circuit K1, and the other end of the controllable switch circuit K1 is used for connecting a battery VBO;
the control end of the controllable switch circuit K1 is used for connecting one pin IR _ FAR _ PWR of a power meter control unit, for example, a power meter built-in MCU;
the other end of the second input branch is connected with a VCC voltage pin; the VCC voltage is power supply voltage obtained from the power grid, and the power grid voltage is converted into power supply voltage through transformation, rectification and the like;
and the other end of the output branch is used for connecting a power supply end VBB _ IP of the electric energy meter communication module.
It can be known from the above description that the embodiment of the utility model discloses an electric energy meter communication module's power supply circuit has realized that battery output voltage is controllable through establishing ties controllable switch circuit K1 at the battery output. The control logic of the electric energy meter control unit to the controllable switch circuit K1 is preset by a worker, so that the controllable switch circuit K1 can be disconnected when the electric energy meter normally works, the VCC voltage supplies power to the electric energy meter communication module, and the electric quantity of a battery is not consumed; when the power grid is powered off (at the moment, the electric energy meter is in a low power consumption state), the controllable switch circuit K1 is closed, the battery supplies power for the electric energy meter communication module, and the electric quantity of the battery begins to be consumed after the power grid is powered off, so that the electric quantity of the battery is sufficient at the moment of the power grid power off, and the electric energy meter communication module is supported to continue to work for a long time. Compared with the prior art, the embodiment of the utility model provides an obviously improved electric energy meter communication module's power supply circuit's power supply reliability.
Optionally, still referring to fig. 3, the dual-power-supply circuit 100 further includes a module for filtering, stabilizing and limiting the output signal of the output branch (i.e., the voltage and current signal output to the power supply terminal VBB _ IP via the dual-power-supply circuit 100, i.e., the power supply terminal signal of the communication module of the electric energy meter). Therefore, the smoothness and the stability of the power supply signal of the electric energy meter communication module are ensured, and overcurrent damage of devices caused by overlarge power supply signal of the electric energy meter communication module is avoided.
In one embodiment, still referring to fig. 3, the module of the dual power supply circuit 100 for performing current limiting processing on the power terminal signal of the communication module of the electric energy meter includes: a current limiting resistor R127; and the current limiting resistor R127 is connected in series on the output branch. The resistance of the current limiting resistor R127 may be selected according to actual needs, without limitation. The current limiting resistor R127 may be an independent resistor device, or a series, parallel, or series-parallel combination of a plurality of resistor devices, and is not limited in the same way.
In one embodiment, still referring to fig. 3, the module of the dual power supply circuit 100 for filtering the power terminal signal of the communication module of the electric energy meter includes: a filter capacitor CP1; one end of the filter capacitor CP1 is connected to the common terminal O1 of the first input branch, the second input branch and the output branch, and the other end is grounded. The capacitance value of the filter capacitor CP1 is generally set to be relatively small. The filter capacitor CP1 may be an independent capacitor device, or a series, parallel, or series-parallel combination of a plurality of capacitor devices, without limitation.
In one embodiment, still referring to fig. 3, the module of the dual power supply circuit 100 for performing voltage stabilization processing on the power terminal signal of the communication module of the electric energy meter includes: a voltage stabilizing capacitor C61; one end of the voltage-stabilizing capacitor C61 is used for connecting a power supply end VBB _ IP of the electric energy meter communication module, and the other end is grounded. The capacitance value of the voltage-stabilizing capacitor C61 is generally set to be larger, and a large capacitor is used for storing energy, so that the output is stable. The voltage stabilizing capacitor C61 may be an independent capacitor device, or a series, parallel, or series-parallel combination of a plurality of capacitor devices, without limitation.
Optionally, in any of the embodiments disclosed above, when the VCC voltage is higher than the voltage required by the communication module of the electric energy meter, the second input branch is further connected in series with a voltage regulating circuit VD3, as shown in fig. 4.
Generally, the VCC voltage is higher than the voltage required by the communication module of the electric energy meter by about 0.7V, and at this time, the voltage regulation circuit needs to adopt a voltage reduction circuit, as shown in fig. 5. The voltage reduction circuit is formed by connecting double diodes in parallel, for example, and is low in cost, as shown in fig. 6.
Optionally, in any of the embodiments disclosed above, referring to fig. 7, the controllable switch circuit K1 includes: an N-type switch tube Q6, a P-type switch tube Q7, a first resistor R27, a second resistor R28 and a third resistor R94;
the control electrode of the N-type switching tube Q6 is connected with one end of a first resistor R27, and the other end of the first resistor R27 is used as the control end of the controllable switching circuit K1;
the electric energy input pole of the N-type switch tube Q6 is connected with the control pole of the P-type switch tube Q7 through a second resistor R28;
the electric energy output electrode of the N-type switching tube Q6 is grounded and is connected with the control end of the controllable switching circuit K1 through a third resistor R94;
the electric energy input electrode of the P-type switching tube Q7 is used for receiving the voltage of the battery;
the electric energy output electrode of the P-type switch tube Q7 is connected with the dual-power supply circuit 100.
Optionally, the N-type switching tube Q6 is an NPN triode, an N-type MOSFET, or an N-type IGBT, but is not limited thereto. The P-type switch Q7 is a PNP triode, a P-type MOSFET or a P-type IGBT, but not limited thereto.
In consideration of cost, the embodiment of the present invention further recommends that the N-type switch Q6 employs an NPN transistor, and the P-type switch Q7 employs a PNP transistor. When the N-type switching tube Q6 is a triode, the electric energy input electrode of the N-type switching tube Q6 is a collector electrode of the triode, the electric energy output electrode of the N-type switching tube Q6 is an emitting electrode of the triode, and the control electrode of the N-type switching tube Q6 is a base electrode of the triode; when the P-type switch tube Q7 is a triode, the electric energy input terminal of the P-type switch tube Q7 is an emitting electrode of the triode, the electric energy output terminal of the P-type switch tube Q7 is a collecting electrode of the triode, and the control terminal of the P-type switch tube Q7 is a base electrode of the triode.
The working principle of the circuit shown in fig. 7 is described below by taking an NPN transistor as the N-type switching transistor Q6 and a PNP transistor as the P-type switching transistor Q7 as an example:
when the electric energy meter normally works, the IR _ FAR _ PWR is at a low level, the NPN triode Q6 is not conducted, the base electrode of the PNP triode Q7 is at a high level, the PNP triode Q7 is not conducted, the VCC voltage is reduced through the voltage reduction circuit VD3, and then the VBB _ IR is supplied with power through the current limiting resistor Q127. When the electric energy meter enters a low power consumption mode, voltage does not exist at VCC, the MCU pulls the pin voltage of the IR _ FAR _ PWR high, the NPN triode Q6 is conducted, the collector of the PNP triode Q7 is low voltage, the PNP triode Q7 is conducted, and the battery voltage VBO supplies power for the VBB _ IR through the current limiting resistor R127, so that the communication module can be normally used. The third resistor R94 and the second resistor R28 are pull-down resistors, so that the PNP triode Q7 is prevented from misoperation; the first resistor R27 is a base current limiting resistor.
Furthermore, the embodiment of the utility model provides a still disclose an electric energy meter, include: the electric energy meter communication module and the power circuit of any one of the electric energy meter communication modules disclosed above.
Optionally, the electric energy meter communication module is an infrared communication module, but is not limited thereto.
The utility model discloses a controllable switch circuit K1 of series connection at the battery output end, it is controllable to have realized battery output voltage. The control logic of the electric energy meter control unit to the controllable switch circuit K1 is preset by a worker, so that the controllable switch circuit K1 can be disconnected when the electric energy meter normally works, and the electric energy meter communication module is supplied with power by VCC voltage; the controllable switch circuit K1 is closed when the power grid is powered off, the battery supplies power to the electric energy meter communication module, and the electric quantity of the battery begins to be consumed after the power grid is powered off, so that the electric quantity of the battery is sufficient at the moment of power grid power off, the electric energy meter communication module is supported to continuously work for a long time, and the power supply reliability of the power supply circuit is obviously improved.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the electric energy meter disclosed in the embodiment, since the electric energy meter corresponds to the power circuit of the electric energy meter communication module disclosed in the embodiment, the description is relatively simple, and the relevant points can be referred to the description of the power circuit part of the electric energy meter communication module.
The terms "first," "second," and the like in the description and in the claims, and in the drawings, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. 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, the use of the verb "comprise a" to define an element does not exclude the presence of another, identical element in a process, method, article, or apparatus that comprises the element.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A power supply circuit of an electric energy meter communication module is characterized by comprising: a controllable switch circuit (K1) and a dual power supply circuit (100);
the dual-power-supply circuit (100) comprises a first input branch, a second input branch and an output branch, wherein one ends of the three branches are connected into one point, namely a common end (O1);
the other end of the first input branch is connected with one end of the controllable switch circuit (K1), and the other end of the controllable switch circuit (K1) is used for connecting a battery (VBO);
the control end of the controllable switch circuit (K1) is used for connecting one pin (IR _ FAR _ PWR) of a power meter control unit;
the other end of the second input branch is connected with a VCC voltage pin;
the other end of the output branch is used for connecting a power supply end (VBB _ IP) of the electric energy meter communication module.
2. The power supply circuit of the electric energy meter communication module according to claim 1, wherein the dual power supply circuit (100) further comprises a module for filtering, voltage-stabilizing and current-limiting the power supply end signal of the electric energy meter communication module.
3. The power supply circuit of the electric energy meter communication module as claimed in claim 2, wherein the module of the dual power supply circuit (100) for performing current limiting processing on the power end signal of the electric energy meter communication module comprises: a current limiting resistor (R127);
the current limiting resistor (R127) is connected in series with the output branch.
4. The power supply circuit of the electric energy meter communication module as claimed in claim 2, wherein the module for filtering the power end signal of the electric energy meter communication module in the dual power supply circuit (100) comprises: a filter capacitance (CP 1);
one end of the filter capacitor (CP 1) is connected with the common end (O1) of the first input branch, the second input branch and the output branch, and the other end of the filter capacitor is grounded.
5. The power supply circuit of the electric energy meter communication module according to claim 2, wherein the module of the dual power supply circuit (100) for performing voltage stabilization processing on the power supply end signal of the electric energy meter communication module comprises: a voltage stabilization capacitor (C61);
one end of the voltage stabilizing capacitor (C61) is used for being connected with a power supply end VBB _ IP of the electric energy meter communication module, and the other end of the voltage stabilizing capacitor is grounded.
6. The power circuit of the electric energy meter communication module as claimed in claim 2, wherein the second input branch is further connected in series with a voltage reduction circuit (VD 3).
7. The power circuit of the electric energy meter communication module as claimed in claim 6, wherein the voltage reduction circuit (VD 3) is a voltage reduction circuit formed by connecting two diodes in parallel.
8. The power supply circuit of a communication module of an electric energy meter according to any one of claims 1 to 7, characterized in that the controllable switching circuit (K1) comprises: the circuit comprises an N-type switch tube (Q6), a P-type switch tube (Q7), a first resistor (R27), a second resistor (R28) and a third resistor (R94);
the control electrode of the N-type switching tube (Q6) is connected with one end of the first resistor (R27), and the other end of the first resistor (R27) is used as the control end of the controllable switching circuit (K1);
the electric energy input electrode of the N-type switch tube (Q6) is connected with the control electrode of the P-type switch tube (Q7) through a second resistor (R28);
the electric energy output electrode of the N-type switching tube (Q6) is grounded and is connected with the control end of the controllable switching circuit (K1) through a third resistor (R94);
the electric energy input electrode of the P-type switching tube (Q7) is used for receiving battery voltage;
and the electric energy output electrode of the P-type switching tube (Q7) is connected with a dual-power supply circuit (100).
9. An electric energy meter, comprising: an electric energy meter communication module, and a power supply circuit of the electric energy meter communication module according to any one of claims 1 to 8.
10. The electric energy meter according to claim 9, wherein the electric energy meter communication module is an infrared communication module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221936614.7U CN218412701U (en) | 2022-07-26 | 2022-07-26 | Power supply circuit of electric energy meter communication module and electric energy meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221936614.7U CN218412701U (en) | 2022-07-26 | 2022-07-26 | Power supply circuit of electric energy meter communication module and electric energy meter |
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| Publication Number | Publication Date |
|---|---|
| CN218412701U true CN218412701U (en) | 2023-01-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221936614.7U Active CN218412701U (en) | 2022-07-26 | 2022-07-26 | Power supply circuit of electric energy meter communication module and electric energy meter |
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| CN (1) | CN218412701U (en) |
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2022
- 2022-07-26 CN CN202221936614.7U patent/CN218412701U/en active Active
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