CN220775660U - Electric energy meter and power supply thereof - Google Patents
Electric energy meter and power supply thereof Download PDFInfo
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- CN220775660U CN220775660U CN202322189845.7U CN202322189845U CN220775660U CN 220775660 U CN220775660 U CN 220775660U CN 202322189845 U CN202322189845 U CN 202322189845U CN 220775660 U CN220775660 U CN 220775660U
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Abstract
The application provides an electric energy meter and power thereof, this electric energy meter power includes: the device comprises a half-wave rectifying unit, a chopping unit and a filtering unit; the input end of the half-wave rectifying unit receives power input voltage, the output end of the half-wave rectifying unit is connected with the input end of the filtering unit through the chopping unit, the output end of the filtering unit outputs power output voltage, and compared with an electric energy meter power supply adopting a flyback switching power supply scheme, the electric energy meter power supply does not need to be provided with a transformer, is smaller in size, and has fewer protection circuits aiming at the defects of the transformer, so that a circuit is simpler, and the problem that the existing electric energy meter power supply adopting the flyback switching power supply scheme needs to be provided with the transformer, and the circuit is complex and high in cost is solved.
Description
Technical Field
The application relates to the technical field of electronic power, in particular to an electric energy meter and a power supply thereof.
Background
With the continuous progress of electronic technology, the existing power supply of the electric energy meter generally adopts a flyback switching power supply scheme.
However, the flyback switching power supply scheme needs to be provided with a transformer, and the circuit is complex and high in cost.
Disclosure of Invention
To this, this application provides an electric energy meter and power thereof to solve current electric energy meter power that adopts flyback switching power supply scheme and need set up the transformer, lead to the complicated problem with high costs of circuit.
In order to achieve the above purpose, the embodiment of the present application provides the following technical solutions:
the first aspect of the application discloses an electric energy meter power supply, comprising: the device comprises a half-wave rectifying unit, a chopping unit and a filtering unit; the input end of the half-wave rectifying unit is connected with the input end of the filtering unit through the chopping unit, and the output end of the filtering unit outputs power supply output voltage.
Optionally, in the above electric energy meter power supply, the method further includes: and the overvoltage protection unit is arranged at the front stage of the half-wave rectification unit.
Optionally, in the above electric energy meter power supply, the overvoltage protection unit includes: and the piezoresistor is connected with the input end of the half-wave rectifying unit in parallel.
Optionally, in the above electric energy meter power supply, the input end of the half-wave rectification unit includes a first input end and a second input end, and the half-wave rectification unit includes: the first diode, the first capacitor, the second capacitor, the first resistor and the second resistor;
the anode of the first diode is used as a first input end of the half-wave rectifying unit and is connected to the anode of the power supply input voltage; the cathode of the first diode is respectively connected with one end of the first capacitor and one end of the first resistor, and the connection point is used as the output end of the half-wave rectifying unit;
the other end of the first capacitor is respectively connected with the other end of the first resistor, one end of the second resistor and one end of the second capacitor, and the other end of the second capacitor and the other end of the second resistor are used as second input ends of the half-wave rectifying unit and are connected to the negative electrode of the power supply input voltage.
Optionally, in the above electric energy meter power supply, the half-wave rectification unit further includes: and the third resistor is arranged in front of the first diode and is connected with the first diode in series.
Optionally, in the above electric energy meter power supply, the half-wave rectification unit further includes: the third capacitor is arranged at the front stage of the first diode and is connected with the first capacitor, the second capacitor, the first resistor and the second resistor in parallel, and the first inductor is arranged at the rear stage of the first diode and is connected with the first diode in series.
Optionally, in the above electric energy meter power supply, the input end of the chopper unit includes a first input end and a second input end, the first input end is connected with the output end of the half-wave rectifying unit, the second input end is connected with the second input end of the half-wave rectifying unit, the output end of the chopper unit includes a first output end and a second output end, and the chopper unit includes: the chopper comprises a chopper device, a fourth capacitor, a fifth capacitor, a second diode, a third diode and a fourth resistor;
the chopper device comprises a first port, a second port, a third port, a fourth port and a fifth port; the first port of the chopper device is connected with the second port of the chopper device, and the connection point is used as a first input end of the chopper unit; the third port of the chopper device is respectively connected with one end of the fourth capacitor, one end of the fifth capacitor and the cathode of the second diode, the anode of the second diode is connected with one end of the fourth resistor, and the other end of the fourth resistor is used as a first output end of the chopper unit; the other end of the fourth capacitor is respectively connected with a fourth port of the chopping device, a fifth port of the chopping device, the other end of the fifth capacitor and the cathode of the third diode, the connection point is used as the second output end of the chopping unit, and the anode of the third diode is used as the second input end of the chopping unit.
Optionally, in the above electric energy meter power supply, the input end of the filtering unit includes a first input end and a second input end, the first input end is connected to the first input end of the chopping unit, the first input end is further used as the output end of the chopping unit, the second input end is connected to the second output end of the chopping unit, and the filtering unit includes: a second inductor, a sixth capacitor and a seventh capacitor;
one end of the second inductor is connected with one end of the sixth capacitor and one end of the seventh capacitor, and a connection point is used as a first input end of the filtering unit; the other end of the second inductor is used as a second input end of the filtering unit; the other end of the sixth capacitor is connected with the other end of the seventh capacitor and grounded.
Optionally, in the above electric energy meter power supply, the filtering unit further includes: and a fifth resistor connected in parallel with the sixth capacitor and the seventh capacitor, respectively.
A second aspect of the present application discloses an electric energy meter comprising: a power meter body and a power meter power supply as disclosed in any one of the first aspects.
The utility model provides an electric energy meter power, include: the device comprises a half-wave rectifying unit, a chopping unit and a filtering unit; the input end of the half-wave rectifying unit receives the power input voltage, the output end of the half-wave rectifying unit is connected with the input end of the filtering unit through the chopping unit, and the output end of the filtering unit outputs the power output voltage.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present application, and that other drawings may be obtained according to the provided drawings without inventive effort to a person skilled in the art.
Fig. 1 is a schematic structural diagram of an electric energy meter power supply according to an embodiment of the present application;
fig. 2 is a specific circuit diagram of an electric energy meter power supply according to an embodiment of the present application;
fig. 3 is a schematic diagram of a supply current loop according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of another power supply of an electric energy meter according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
The embodiment of the application provides an electric energy meter power supply to solve the problem that the existing electric energy meter power supply adopting a flyback switching power supply scheme needs to be provided with a transformer, and the circuit is complicated and high in cost.
Referring to fig. 1, the power supply of the electric energy meter may include: half-wave rectifying unit 101, chopping unit 102, and filtering unit 103. The input end of the half-wave rectifying unit 101 receives the power input voltage, the output end of the half-wave rectifying unit 101 is connected with the input end of the filtering unit 103 through the chopping unit 102, and the output end of the filtering unit 103 outputs the power output voltage.
In practical applications, referring to fig. 2, the input end of the half-wave rectifying unit 101 may include a first input end and a second input end, and the half-wave rectifying unit 101 may specifically include: the first diode D1, the first capacitor C2, the second capacitor C1, the first resistor R2 and the second resistor R3.
Wherein the anode of the first diode D1 is connected to the positive electrode (N in the figure) of the power supply input voltage as the first input terminal of the half-wave rectification unit 101; the cathode of the first diode D1 is respectively connected with one end of the first capacitor C2 and one end of the first resistor R2, and the connection point is used as the output end of the half-wave rectifying unit 101; the other end of the first capacitor C2 is connected to the other end of the first resistor R2, one end of the second resistor R3, and one end of the second capacitor C1, respectively, and the other end of the second capacitor C1 and the other end of the second resistor R3 serve as second input ends of the half-wave rectifying unit 101, and are connected to a negative electrode (L in the drawing) of the power supply input voltage.
Since only one capacitor is provided, the withstand voltage requirement cannot be satisfied, and therefore the first capacitor C2 and the second capacitor C1 need to be used in series to increase the withstand voltage. The first resistor R2 and the second resistor R3 mainly serve to equalize the voltage so that the voltage across the first capacitor C2 is equal to the voltage across the second capacitor C1.
In some embodiments, also in connection with fig. 2, the half-wave rectification unit 101 may further comprise: the third resistor R1 is disposed in front of the first diode D1 and connected in series with the first diode D1, and is used for suppressing the charging current of the first capacitor C2 and the second capacitor C1.
The specific type of the third resistor R1 may be a wire-wound resistor; of course, the present utility model is not limited to this, and other conventional resistors may be used, and the specific type of the third resistor R1 is not limited in the present application, and is within the scope of protection of the present application.
In some embodiments, also in connection with fig. 2, the half-wave rectification unit 101 may further comprise: the third capacitor CX1 and the first inductor L2, the third capacitor CX1 is arranged at the front stage of the first diode D1 and is connected with the first capacitor C2, the second capacitor C1, the first resistor R2 and the second resistor R3 in parallel, and the first inductor L2 is arranged at the rear stage of the first diode D1 and is connected with the first diode D1 in series. The third capacitor CX1 and the first inductor L2 are mainly configured to suppress electromagnetic interference of the power supply; the specific type of the third capacitor CX1 may be a safety capacitor; of course, the present utility model is not limited to this, and other capacitors may be used, and the specific type of the third capacitor CX1 is not limited to this, and is within the scope of protection of the present utility model.
In practical application, with reference to fig. 2 as well, the input end of the chopper unit 102 includes a first input end and a second input end, the first input end is connected with the output end of the half-wave rectifying unit 101, the second input end is connected with the second input end of the half-wave rectifying unit 101, the output end of the chopper unit 102 includes a first output end and a second output end, and the chopper unit 102 includes: chopper device, fourth capacitor C3, fifth capacitor C4, second diode D3, third diode D2, and fourth resistor R10.
The chopper device comprises a first port, a second port, a third port, a fourth port and a fifth port; the first port of the chopper device is connected with the second port of the chopper device, and the connection point is used as a first input end of the chopper unit 102; the third port of the chopper device is respectively connected with one end of a fourth capacitor C3, one end of a fifth capacitor C4 and the cathode of a second diode D3, the anode of the second diode D3 is connected with one end of a fourth resistor R10, and the other end of the fourth resistor R10 is used as a first output end of the chopper unit 102; the other end of the fourth capacitor C3 is connected to the fourth port of the chopper device, the fifth port of the chopper device, the other end of the fifth capacitor C4, and the cathode of the third diode D2, respectively, and the connection point is used as the second output end of the chopper unit 102, and the anode of the third diode D2 is used as the second input end of the chopper unit 102.
In practical application, the chopper device may be a power chip, specifically may be a power chip of a MOSFET; of course, the present utility model is not limited to this, and other power chips may be used, and the present utility model is not limited thereto, and all of them are within the scope of protection of the present utility model.
It should be noted that, as shown in fig. 2, if the chopper device is a power supply chip of a MOSFET, the first port of the chopper device may be a first drain pin (SW numbered 8 in the drawing), the second port of the chopper device may be a second drain pin (SW numbered 7 in the drawing), the third port of the chopper device may be a power supply pin (VDD in the drawing), the fourth port of the chopper device may be a first ground pin (GND numbered 1 in the drawing), and the fifth port of the chopper device may be a second ground pin (GND numbered 2 in the drawing) of the power supply chip.
In some embodiments, the third diode D2 in the chopper unit 102 is typically a freewheeling diode, which on the one hand is used to provide a current loop when the chopper device is off, i.e. as shown in fig. 3; on the other hand, when the chopper device is turned off, the cathode voltage of the third diode D2 is clamped at 0.7V, protecting the chopper device from high voltage. The second diode D3 in the chopper unit 102 is mainly used for single-phase conduction, and is matched with the fourth capacitor C3, the fifth capacitor C4 and the fourth resistor R10 together to ensure that the chopper device is powered normally.
In some embodiments, the fourth capacitor C3 may be a ceramic chip capacitor, and the fifth capacitor C4 may be an electrolytic capacitor, and their main functions are all to store energy; of course, the specific types of the fourth capacitor C3 and the fifth capacitor C4 are not limited thereto, but other capacitors may be available, and the present application is not limited thereto, and all are within the protection scope of the present application.
In practical application, with reference to fig. 2 as well, the input terminal of the filtering unit 103 includes a first input terminal and a second input terminal, the first input terminal is connected to the first input terminal of the chopping unit 102, the first input terminal is also used as the output terminal of the chopping unit 102, the second input terminal is connected to the second output terminal of the chopping unit 102, and the filtering unit 103 may include: a second inductance L3, a sixth capacitance C5 and a seventh capacitance C6.
One end of the second inductor L3 is connected to one end of the sixth capacitor C5 and one end of the seventh capacitor C6, and the connection point is used as a first input end of the filtering unit 103; the other end of the second inductor L3 is used as a second input end of the filtering unit 103; the other end of the sixth capacitor C5 is connected to the other end of the seventh capacitor C6 and grounded.
It should be noted that the second inductor L3, the sixth capacitor C5, and the seventh capacitor C6 may form a filter device at a later stage of the chopper unit 102.
In some embodiments, also in connection with fig. 2, the filtering unit 103 may further comprise: the fifth resistor R22 is connected in parallel with the sixth capacitor C5 and the seventh capacitor C6, respectively, and is used for providing a dummy load when the power load of the electric energy meter is low.
It should be noted that, with reference to fig. 2, the design working range of the electric energy meter power supply provided by the scheme can be 85Vac-420Vac, the output power is more than or equal to 2W, and the working range and the load capacity of the power frequency transformer are far exceeded; and the weight is lower than that of a power frequency transformer (which is formed by adding a coil to an iron core and pouring sealant on part), thereby being beneficial to improving the shock resistance of the whole transformer.
In some embodiments, referring to fig. 4, the power meter power supply may further include: the overvoltage protection unit 104 is disposed at the front stage of the half-wave rectification unit 101, and is used for protecting the rear stage circuit from overvoltage damage.
Specifically, referring also to fig. 2, the overvoltage protection unit 104 may include: the varistor RV1, the varistor RV1 is connected in parallel with the input of the half-wave rectifying unit 101.
When a lightning surge or a voltage group pulse occurs, the varistor RV1 starts to operate, and protects the subsequent stage from overvoltage damage.
Based on the above, the electric energy meter power supply provided in this embodiment includes: a half-wave rectifying unit 101, a chopping unit 102, and a filtering unit 103; the input end of the half-wave rectifying unit 101 receives the power input voltage, the output end of the half-wave rectifying unit 101 is connected with the input end of the filtering unit 103 through the chopping unit 102, and the output end of the filtering unit 103 outputs the power output voltage. In addition, when 420Vac is input, the rectified voltage is 593V, and the scheme has the advantages that no transformer exists, so that the reflected voltage generated by the transformer does not exist, the withstand voltage of 700V of the chopper device can meet the requirement, and the flyback device needs to consider withstand voltage of more than 1000V. In addition, the scheme adopts half-wave rectification, and compared with a full-wave rectification circuit, the method is simpler and lower in cost.
It is worth to say that, still there is the electric energy meter power that adopts the resistance-capacitance step-down scheme now, under the condition that the harmonic exceeds standard, the capacitive reactance can diminish, can burn out the device after having reached a definite value, and because this scheme is commutated the input voltage again, does not receive the harmonic influence.
Based on the electric energy meter power supply provided in the above embodiment, optionally, another embodiment of the present application further provides an electric energy meter, including: the electric energy meter body and the electric energy meter power supply according to any of the embodiments, wherein the electric energy meter power supply is used for supplying power to the electric energy meter body so as to ensure normal operation of the electric energy meter.
It should be noted that, the related description about the power supply of the electric energy meter can be referred to the above corresponding embodiments, and will not be repeated here; the related description of the electric energy meter can also be referred to in the prior art, and will not be repeated here.
Features described in the embodiments in this specification may be replaced or combined, and identical and similar parts of the embodiments may be referred to each other, where each embodiment focuses on differences from other embodiments. In particular, for a system or system embodiment, since it is substantially similar to a method embodiment, the description is relatively simple, with reference to the description of the method embodiment being made in part. The systems and system embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present utility model without undue burden.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative elements and steps are described above generally in terms of functionality in order to clearly illustrate the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. 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 application. Thus, the present application 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.
It is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Claims (10)
1. An electrical energy meter power supply, comprising: the device comprises a half-wave rectifying unit, a chopping unit and a filtering unit; the input end of the half-wave rectifying unit is connected with the input end of the filtering unit through the chopping unit, and the output end of the filtering unit outputs power supply output voltage.
2. The power meter of claim 1, further comprising: and the overvoltage protection unit is arranged at the front stage of the half-wave rectification unit.
3. The power supply of claim 2, wherein the overvoltage protection unit comprises: and the piezoresistor is connected with the input end of the half-wave rectifying unit in parallel.
4. The power meter of claim 1, wherein the input of the half-wave rectification unit comprises a first input and a second input, the half-wave rectification unit comprising: the first diode, the first capacitor, the second capacitor, the first resistor and the second resistor;
the anode of the first diode is used as a first input end of the half-wave rectifying unit and is connected to the anode of the power supply input voltage; the cathode of the first diode is respectively connected with one end of the first capacitor and one end of the first resistor, and the connection point is used as the output end of the half-wave rectifying unit;
the other end of the first capacitor is respectively connected with the other end of the first resistor, one end of the second resistor and one end of the second capacitor, and the other end of the second capacitor and the other end of the second resistor are used as second input ends of the half-wave rectifying unit and are connected to the negative electrode of the power supply input voltage.
5. The power meter of claim 4, wherein the half-wave rectification unit further comprises: and the third resistor is arranged in front of the first diode and is connected with the first diode in series.
6. The power meter of claim 4, wherein the half-wave rectification unit further comprises: the third capacitor is arranged at the front stage of the first diode and is connected with the first capacitor, the second capacitor, the first resistor and the second resistor in parallel, and the first inductor is arranged at the rear stage of the first diode and is connected with the first diode in series.
7. The power supply of claim 1, wherein the input of the chopping unit comprises a first input and a second input, the first input being connected to the output of the half-wave rectifying unit, the second input being connected to the second input of the half-wave rectifying unit, the output of the chopping unit comprising a first output and a second output, the chopping unit comprising: the chopper comprises a chopper device, a fourth capacitor, a fifth capacitor, a second diode, a third diode and a fourth resistor;
the chopper device comprises a first port, a second port, a third port, a fourth port and a fifth port; the first port of the chopper device is connected with the second port of the chopper device, and the connection point is used as a first input end of the chopper unit; the third port of the chopper device is respectively connected with one end of the fourth capacitor, one end of the fifth capacitor and the cathode of the second diode, the anode of the second diode is connected with one end of the fourth resistor, and the other end of the fourth resistor is used as a first output end of the chopper unit; the other end of the fourth capacitor is respectively connected with a fourth port of the chopping device, a fifth port of the chopping device, the other end of the fifth capacitor and the cathode of the third diode, the connection point is used as the second output end of the chopping unit, and the anode of the third diode is used as the second input end of the chopping unit.
8. The power supply of claim 1, wherein the input of the filter unit comprises a first input connected to the first input of the chopper unit, the first input further being an output of the chopper unit, and a second input connected to the second output of the chopper unit, the filter unit comprising: a second inductor, a sixth capacitor and a seventh capacitor;
one end of the second inductor is connected with one end of the sixth capacitor and one end of the seventh capacitor, and a connection point is used as a first input end of the filtering unit; the other end of the second inductor is used as a second input end of the filtering unit; the other end of the sixth capacitor is connected with the other end of the seventh capacitor and grounded.
9. The power meter of claim 8, wherein the filtering unit further comprises: and a fifth resistor connected in parallel with the sixth capacitor and the seventh capacitor, respectively.
10. An electric energy meter, comprising: a power meter body and a power meter power supply as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322189845.7U CN220775660U (en) | 2023-08-14 | 2023-08-14 | Electric energy meter and power supply thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322189845.7U CN220775660U (en) | 2023-08-14 | 2023-08-14 | Electric energy meter and power supply thereof |
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| CN220775660U true CN220775660U (en) | 2024-04-12 |
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| CN202322189845.7U Active CN220775660U (en) | 2023-08-14 | 2023-08-14 | Electric energy meter and power supply thereof |
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| CN (1) | CN220775660U (en) |
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