CN110048622A - A kind of power circuit and three-phase kilowatt-hour meter system for electric energy meter - Google Patents
A kind of power circuit and three-phase kilowatt-hour meter system for electric energy meter Download PDFInfo
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- CN110048622A CN110048622A CN201910310347.9A CN201910310347A CN110048622A CN 110048622 A CN110048622 A CN 110048622A CN 201910310347 A CN201910310347 A CN 201910310347A CN 110048622 A CN110048622 A CN 110048622A
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
- H02M7/062—Avoiding or suppressing excessive transient voltages or currents
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0038—Circuits or arrangements for suppressing, e.g. by masking incorrect turn-on or turn-off signals, e.g. due to current spikes in current mode control
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
- H02M1/123—Suppression of common mode voltage or current
Abstract
The invention belongs to electronic circuit technology fields, provide a kind of power circuit for electric energy meter and three-phase kilowatt-hour meter system, including protective module, rectification module, filter module, electrolytic module, switch module, feedback module and output module, by sequentially carrying out overvoltage protection to the power supply signal of three phase mains output, inhibit surge current, full-wave rectification, after common mode filtering and electricity storage, switch module is connected according to the power supply signal that electricity stores, and output drive signal and to power supply signal carry out voltage transformation, the feedback signal that final output module combination feedback module provides, after carrying out ripple processing to the power supply signal after voltage transformation, output optimization electric signal is to drive electric energy meter.After carrying out overvoltage protection from there through the power supply signal exported to three phase mains, a series of processing such as surge current, full-wave rectification, common mode filtering and ripple processing inhibited to act; stabilization signal is exported to drive electric energy meter; efficiency is greatly improved, stability is stronger.
Description
Technical field
The invention belongs to electronic circuit technology field more particularly to a kind of power circuits and three-phase kilowatt-hour meter for electric energy meter
System.
Background technique
Currently, the power supply of domestic electric energy meter remains unchanged based on traditional Industrial Frequency Transformer, and external some products are
Switching Power Supply is gradually used.Main reasons is that output power requires to increase, Industrial Frequency Transformer after the function of electric energy meter is reinforced
It is difficult to be competent at.Switching Power Supply be different from electric energy meter in other devices, scale, standardized production or will be improve quality, drop
Low production cost, optimized production process.The existing power technology for electric energy meter is not yet mature, inefficiency, stability
Difference.
Therefore, there is due to a lack of the prominent of defencive function and reply light-load efficiency for the existing power technology for electric energy meter
Hair mode leads to the problem of inefficiency and stability difference.
Summary of the invention
The purpose of the present invention is to provide a kind of power circuit for electric energy meter and three-phase kilowatt-hour meter systems, it is intended to solve existing
Some is used for the power technology of electric energy meter there is the burst mode due to a lack of defencive function and reply light-load efficiency, leads to efficiency
Low and stability difference problem.
First aspect present invention provides a kind of power circuit for electric energy meter, and the power circuit includes:
It is connect with three phase mains, the power supply signal for exporting to the three phase mains carries out overvoltage protection and inhibits surge
The protective module of electric current；
It is connect with the protective module, it is complete for being carried out to the power supply signal after overvoltage protection and inhibition surge current
The rectification module of wave rectification；
It is connect with the rectification module, for carrying out the filtering mould of common mode filtering to the power supply signal after full-wave rectification
Block；
It is connect with the filter module, for carrying out the electrolysis mould of electricity storage to the power supply signal after common mode filtering
Block；
It is connect with the electrolytic module, the power supply signal for being stored according to electricity is connected, and output driving
Signal and the switch module that voltage transformation is carried out to the power supply signal；
It is connect with the switch module, for exporting the feedback module of feedback signal according to the driving signal；And
It connect, is used in conjunction with the feedback signal, after voltage transformation with the switch module and the feedback module
After the power supply signal carries out ripple processing, output optimizes electric signal to drive the output module of electric energy meter.
Second aspect of the present invention provides a kind of three-phase kilowatt-hour meter system, three including electric energy meter and for providing power supply signal
Phase power supply, the three-phase kilowatt-hour meter system further include power circuit as described above.
A kind of power circuit and three-phase kilowatt-hour meter system for electric energy meter provided by the invention, including protective module, rectification
Module, filter module, electrolytic module, switch module, feedback module and output module, by sequentially to three phase mains output
After power supply signal carries out overvoltage protection, inhibits surge current, full-wave rectification, common mode filtering and electricity storage, switching molding root tuber
According to electricity store power supply signal be connected, and output drive signal and to power supply signal carry out voltage transformation, final output
The feedback signal that module combination feedback module provides, after carrying out ripple processing to the power supply signal after voltage transformation, output optimization
Electric signal is to drive electric energy meter.From there through power supply signal that three phase mains is exported carry out overvoltage protection, inhibit surge current,
After a series of processing movements such as full-wave rectification, common mode filtering, voltage transformation and ripple processing, stabilization signal is exported to drive electricity
Can table, greatly improve efficiency, stability is stronger, solve the existing power technology for electric energy meter there is due to a lack of
The burst mode of defencive function and reply light-load efficiency, leads to the problem of inefficiency and stability difference.
Detailed description of the invention
Fig. 1 is a kind of modular structure schematic diagram for power circuit for electric energy meter that one embodiment of the invention provides.
Fig. 2 is a kind of examples of circuits figure for power circuit for electric energy meter that one embodiment of the invention provides.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
A kind of above-mentioned power circuit and three-phase kilowatt-hour meter system for electric energy meter, including protective module, rectification module, filter
Wave module, electrolytic module, switch module, feedback module and output module, by sequentially believing the power supply of three phase mains output
Number carry out overvoltage protection, inhibit surge current, full-wave rectification, common mode filtering and electricity storage after, switch module is according to electricity
The power supply signal of storage is connected, and output drive signal and to power supply signal carry out voltage transformation, final output module knot
The feedback signal that feedback module provides is closed, after carrying out ripple processing to the power supply signal after voltage transformation, output optimization electric signal
To drive electric energy meter.Overvoltage protection is carried out from there through the power supply signal exported to three phase mains, inhibits surge current, all-wave whole
After a series of processing movements such as stream, common mode filtering, voltage transformation and ripple processing, stabilization signal is exported to drive electric energy meter,
Efficiency is greatly improved, stability is stronger.
Fig. 1 shows a kind of modular structure of power circuit for electric energy meter of one embodiment of the invention offer, in order to
Convenient for explanation, only the parts related to this embodiment are shown, and details are as follows:
A kind of above-mentioned power circuit for electric energy meter, the power circuit include protective module 102, rectification module 103,
Filter module 104, electrolytic module 105, switch module 106, feedback module 108 and output module 107.
Protective module 102 is connect with three phase mains 101, and the power supply signal for exporting to three phase mains 101 carries out over-voltage
Protection and inhibition surge current.
Rectification module 103 is connect with protective module 102, for the power supply signal after overvoltage protection and inhibition surge current
Carry out full-wave rectification.
Filter module 104 is connect with rectification module 103, for carrying out common mode filtering to the power supply signal after full-wave rectification.
Electrolytic module 105 is connect with filter module 104, for carrying out electricity storage to the power supply signal after common mode filtering.
Switch module 106 is connect with electrolytic module 105, and the power supply signal for being stored according to electricity is connected, and defeated
Out driving signal and to power supply signal carry out voltage transformation.
Feedback module 108 is connect with switch module 106, for exporting feedback signal according to driving signal.
Output module 107 is connect with switch module 106 and feedback module 108, for combining feedback signal, to voltage transformation
After power supply signal afterwards carries out ripple processing, output optimization electric signal is to drive electric energy meter 109.
As an embodiment of the present invention, above-mentioned power circuit by sequentially to three phase mains 101 export power supply signal into
After row overvoltage protection, inhibition surge current, full-wave rectification, common mode filtering and electricity storage, switch module 106 is deposited according to electricity
The power supply signal of storage is connected, and output drive signal and to power supply signal carry out voltage transformation, final output module combine
Feedback module provide feedback signal, to after voltage transformation power supply signal carry out ripple processing after, output optimization electric signal with
Drive electric energy meter 109.Overvoltage protection is carried out from there through the power supply signal exported to three phase mains, inhibits surge current, all-wave
After a series of processing movements such as rectification, common mode filtering, voltage transformation and ripple processing, stabilization signal is exported to drive electric energy
Table, greatly improves efficiency, and stability is stronger.
Fig. 2 shows one embodiment of the invention provide a kind of power circuit for electric energy meter exemplary circuit, in order to
Convenient for explanation, only the parts related to this embodiment are shown, and details are as follows:
As an embodiment of the present invention, above-mentioned protective module 102 includes the first varistor RV1, the second varistor
RV2, third varistor RV3, the 15th resistance R315, the 16th resistance R316 and the 17th resistance R317；
The first end of first varistor RV1 and the A phase of the first termination three phase mains 101 of the 15th resistance R315 are held,
The first end of second varistor RV2 and the B phase of the first termination three phase mains 101 of the 16th resistance R316 are held, and third is pressure-sensitive
The first end of resistance RV3 and the C phase of the first termination three phase mains 101 of the 17th resistance R317 are held, the first varistor RV1's
The zero of second termination three phase mains 101 of the second end and third varistor RV3 of second end and the second varistor RV2
Second termination of line, the second end of the 15th resistance R315 and the second end of the 16th resistance R316 and the 17th resistance R317
Rectification module 103.
As an embodiment of the present invention, above-mentioned rectification module 103 include first diode D201, the second diode D202,
Third diode D203, the 7th diode D207, the 8th diode D208, the 9th diode D209, the tenth diode D210 with
And the 11st diode D211；
The cathode of 8th diode D208 connects the anode of first diode D201, and the cathode of the 9th diode D209 connects second
The anode of diode D202, the cathode of the tenth diode D210 meet the anode of third diode D203, the 11st diode D211
Cathode connect the anode of the 7th diode D7, anode, the anode of the 9th diode D209, the 12nd pole of the 8th diode D208
The anode of the anode of pipe D210 and the 11st diode D211 connect filter module 104, the cathode of first diode D201, second
The cathode of diode D202, the cathode of third diode D203, the 7th diode D207 cathode connect filter module 104.
As an embodiment of the present invention, above-mentioned filter module 104 includes the first inductance L1, the second inductance L2, third inductance
L3, the 7th common mode inductance L7 and the 4th capacitor C204；
The first end of first the first inductance L1 of termination of 4th capacitor C204, the second termination third inductance of the first inductance L1
The first end of L3, the first end of the first coil of the second the 7th common mode inductance L7 of termination of third inductance L3, the 4th capacitor C204
Second the second inductance L2 of termination first end, the of the second coil of the second the 7th common mode inductance L7 of termination of the second inductance L2
One end, the second end of the first coil of the 7th common mode inductance L7 and the second end of the second coil connect electrolytic module 105.
As an embodiment of the present invention, above-mentioned electrolytic module 105 includes the 5th electrolytic capacitor C205, the 6th electrolytic capacitor
C206, the 29th resistance R29, the 30th resistance R30, the 31st resistance R31 and the 32nd resistance R32；
The first end of the first the 29th resistance R29 of termination of 5th electrolytic capacitor C205, the of the 29th resistance R29
The first end of two the 30th resistance R30 of termination, the first of the second end of the 5th electrolytic capacitor C205, the 6th electrolytic capacitor C206
The first end at end, the second end of the 30th resistance R30 and the 31st resistance R31 connects altogether, and the second of the 31st resistance R31
The first end of the 32nd resistance R32 is terminated, the second of the 6th electrolytic capacitor C206 terminates the second of the 32nd resistance R32
End.
As an embodiment of the present invention, above-mentioned switch module 106 includes the 20th resistance R320, the 21st resistance
R321, the 22nd resistance R322, the 23rd resistance R323, the 24th resistance R324, the 25th resistance R325, transient state
Inhibit diode TVS8, first resistor R301, second resistance R302,3rd resistor R303, the 4th resistance R304, the 5th resistance
R305, the 6th resistance R306, the 8th capacitor C208, the 9th capacitor C209, the 21st capacitor C221, the 4th diode C204,
Field-effect tube Q25, the 18th diode D18, switch chip U101, first capacitor C111, the 22nd capacitor C222, the 7th electricity
Hold C207 and transformer T1；
The first termination electrolytic module 105 of 20th resistance R320, the second termination the 21st of the 20th resistance R320
The first end of resistance R321, the first end of the second the 22nd resistance R322 of termination of the 21st resistance R321, the 22nd
The first end of the second the 23rd resistance R323 of termination of resistance R322, the second end and the 24th of the 23rd resistance R323
The first end of resistance R324 and the first end of the 25th resistance R325 connect altogether, the second end of the 24th resistance R324 and the
The second end of 25 resistance R325 and the first end of Transient Suppression Diode TVS8 connect altogether, and the first of first resistor R301
End, the first end of second resistance R302, the first end of the 21st capacitor C221, the first end of the 8th capacitor C208, the 5th electricity
Hinder the input terminal of the first end of R305 and the primary coil of the first termination transformer T1 of the 9th capacitor C209, first resistor
The first end of the second termination 3rd resistor R303 of R301, the first of the second the 4th resistance R304 of termination of second resistance R302
End, the second end of 3rd resistor R303, the second end of the 4th resistance R304, the second end and the 4th of the 21st capacitor C221
The cathode of diode C204 connects altogether, and the second end of the 8th capacitor C208 and the second end of the 9th capacitor C209 are grounded, the four or two pole
The anode of pipe C204 and the source electrode of field-effect tube Q25 connect the output end of the primary coil of transformer T1, and the of the 5th resistance R305
The first end of two the 6th resistance R306 of termination, the secondary coil of transformer T1 connect output module 107, and the second of the 6th resistance R306
Terminate the first end of first capacitor C111, anode and field-effect of the drain electrode of switch chip U101 with the 18th diode D18
The drain electrode of pipe Q25 connects altogether, and the cathode of the 18th diode D18 connects the grid of field-effect tube Q25, and the source electrode of switch chip U101 connects
The second end of Transient Suppression Diode TVS8, switch chip U101 bypass termination the 22nd capacitor C222 first end and
The first end of 7th capacitor C207, the enable end of switch chip U101 connect feedback module 108, the second end of first capacitor C111 with
The second end of 22nd capacitor C222 and the second end of the 7th capacitor C207 connect altogether.
As an embodiment of the present invention, above-mentioned output module 107 includes the 7th resistance R307, the 8th resistance R308, the 5th
Diode D205, the 6th diode D206, the 11st capacitor C211, the 12nd capacitor C212, the 13rd capacitor C213, the 14th
Capacitor C214, the 15th capacitor C215, the 16th capacitor C216, the 18th capacitor C218, the 79th capacitor C79 and the 4th
Inductance L4；
The anode of the first the 5th diode D205 of termination of 7th resistance R307, the second termination the tenth of the 7th resistance R307
The first end of one capacitor C211, cathode, the 79th capacitor of the second end of the 11st capacitor C211, the 5th diode D205
The first end of C79 and the first end of the 14th capacitor C214 connect altogether and connect with electric energy meter 109, the 79th capacitor C79's
Second end and the second end of the 14th capacitor C214 are grounded, the sun of the first the 6th diode D206 of termination of the 8th resistance R308
Pole, the first end of the second the 12nd capacitor C212 of termination of the 8th resistance R308, the second end of the 12nd capacitor C212, the six or two
The cathode of pole pipe D206, the first end of the 13rd capacitor C213, the first end of the 15th capacitor C215 and the 4th inductance L4
First end connects altogether, and the first of the second end of the 4th inductance L4 and the first end of the 16th capacitor C216 and the 18th capacitor C218
End connects altogether and connect with electric energy meter 109, and the second end of the 16th capacitor C216 and the second end of the 18th capacitor C218 are grounded.
As an embodiment of the present invention, above-mentioned feedback module 108 includes photoelectrical coupler U25, the 9th resistance R309, the tenth
Resistance R310, eleventh resistor R311, twelfth resistor R312, thirteenth resistor R313, the 14th resistance R314, the 19th electricity
Hold C219, the 20th capacitor C220 and voltage-stablizer U26；
The light-receiving device of photoelectrical coupler U25 connects switch module 106, the input termination of the light emitting source of photoelectrical coupler U25 the
The first end of 14 resistance R314, the first end of the second termination thirteenth resistor R313 of the 14th resistance R314, the 13rd electricity
Hinder the output end of the light emitting source of the second termination photoelectrical coupler U25 of R313, the first end and the 20th of the 19th capacitor C219
The first end of capacitor C220 and the output end of voltage-stablizer U26 connect altogether, the second termination twelfth resistor of the 19th capacitor C219
The first end of R312, the second end of twelfth resistor R312, the second end of the 20th capacitor C220, the 9th resistance R309 first
End, the first end of the tenth resistance R310 and the first end of eleventh resistor R311 connect altogether, the second termination of the 9th resistance R309
The input terminal of output module 107, the second end of the tenth resistance R310 and the second end of eleventh resistor R311 and voltage-stablizer U26
It connects altogether.
The present invention also provides a kind of three-phase kilowatt-hour meter systems, including electric energy meter and for providing the three-phase electricity of power supply signal
Source, the three-phase kilowatt-hour meter system further include power circuit as described above.
The power-supply system of above-mentioned electric energy meter 109 has selected Switching Power Supply, it is contemplated that conventional input voltage is in 230V ± 15%
Small-power switching power-supply, overall efficiency and cost have selected reverse exciting topological mode power supply.
This power-supply system has selected the switch chip of model TNY285, and internal remove is integrated with working frequency as 132KHz
Current module formula controller outside, be also integrated with the MOSFET of 725V, conducting resistance is 19 Ω, is encapsulated as DIP7.In the chip
Portion is integrated with the high voltage startup unit of 725V simultaneously.It is 50 degree in environment temperature, conventional Width funtion inputs (85Vac-265Vac)
Situation, maximal input is up to 11.5W.Meanwhile switch chip U101 also has the guarantor such as overcurrent, over-voltage, input undervoltage, excess temperature
Protective function and the burst mode for improving light-load efficiency.
Below in conjunction with Fig. 1-Fig. 2 to above-mentioned a kind of for the power circuit of electric energy meter and the working principle of three-phase kilowatt-hour meter system
It is described as follows:
Firstly, full-wave rectification of the input voltage Jing Guo prime, common-mode filter (pass through the 4th capacitor C204 and the 7th common mode
Inductance L7)；Varistor RV1, RV2, RV3 constitute overvoltage protection route；Power resistor R315, R316, R317 are for inhibiting wave
Gush electric current.The position of filter inductance is placed on after rectifier bridge to save cost, simultaneously, it is contemplated that input phase failure situation,
As long as i.e. any both threads exist, no matter Live line Zero line or firewire, system still can work normally, using full-wave rectification.
After rectification, since maximum peak voltage is up to 780V, using two 450V electrolytic capacitors (i.e. the 5th electrolytic capacitor C205 and
6th electrolytic capacitor C206) it is used in series, while considering the balance of voltage, capacitor two is attempted by using resistance R29~R32
Side.
Secondly, switching line routing transformer T1, clamp circuit, switching tube and the switch chip U101 of primary side, transient state inhibit
The composition such as diode TVS8, zener diode.When starting, electric current, which flows through zener diode D18 entrance by R320~R323, to be opened
Close the connected high voltage startup unit of the drain electrode of chip U101.High voltage startup unit inside switch chip U101 is 725V, due to
The presence of external Transient Suppression Diode TVS8, extra-high voltage can be clamped in a specific voltage, with protective switch core
Piece U101.But when switch chip U101 is opened, the source electrode of external MOSFET is pulled to ground, so that zener diode D18 is formed instead
Partially, to keep external MOSFET open-minded；When switch chip U101 shutdown when, inductive current first to switch chip U101 inside
The drain source capacitance of MOSFET charges, when Vds voltage reaches the clamp voltage of external Transient Suppression Diode TVS8, electricity
Stream starts to discharge to the gate pole source capacitance of external MOSFET, until the forward voltage of the zener diode between GS is super
Cross 0.7V, external MOSFET shutdown, while electric current will be flowed to by zener diode D18 external Transient Suppression Diode TVS8 or
Resistance R320~R323.Depending on the impedance in two circuits, since the Vgs of external MOSFET is already close to zero,
MOSFET will be turned off thoroughly；For be more than external Transient Suppression Diode TVS8 voltage rating input, at this time R320~
R323 voltage stress is the clamp voltage value of external Transient Suppression Diode TVS8.For example, the transient state using 550V inhibits
The external MOSFET of diode TVS8 and a 600V, then the voltage endurance capability of flyback are as follows: 550V+600V=1150V.Consider to dislike
Bad situation, the time that can be turned off with rough estimate from internal MOSFET to external MOSFET are to flow through external transient state to inhibit two poles
The time of pipe TVS8, peak point current when with maximum load are easy to get the average current for flowing through Transient Suppression Diode TVS8.
Therefore, the loss of Transient Suppression Diode TVS8 is the product of average current and clamp voltage.Output module 107 is by Schottky two
Pole pipe, absorbing circuit and filter are constituted.For ripple requirement, using two-stage filter.Wherein output 2 is main 12V, in addition
12V supplemented by output 1 all the way, the ground isolation of two-way output.
Therefore, by power supply signal that three phase mains is exported carry out overvoltage protection, inhibit surge current, full-wave rectification,
After a series of processing movements such as common mode filtering, voltage transformation and ripple processing, stabilization signal is exported to drive electric energy meter, significantly
Efficiency is improved, stability is stronger.
To sum up, a kind of power circuit and three-phase kilowatt-hour meter system for electric energy meter provided in an embodiment of the present invention, including protect
Module, rectification module, filter module, electrolytic module, switch module, feedback module and output module are protected, by sequentially to three
The power supply signal of phase power supply output carries out overvoltage protection, inhibits surge current, full-wave rectification, common mode filtering and electricity storage
Afterwards, switch module is connected according to the power supply signal that electricity stores, and output drive signal and to power supply signal carry out voltage
Transformation, the feedback signal that final output module combination feedback module provides carry out at ripple the power supply signal after voltage transformation
After reason, output optimization electric signal is to drive electric energy meter.From there through power supply signal that three phase mains is exported carry out overvoltage protection,
After inhibiting a series of processing movements such as surge current, full-wave rectification, common mode filtering, voltage transformation and ripple processing, output is steady
Signal is determined to drive electric energy meter, greatly improves efficiency, and stability is stronger, solves the existing power supply skill for electric energy meter
Art there is due to a lack of defencive function and reply light-load efficiency burst mode, cause inefficiency and stability difference ask
Topic.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (9)
1. a kind of power circuit for electric energy meter, which is characterized in that the power circuit includes:
It is connect with three phase mains, the power supply signal for exporting to the three phase mains carries out overvoltage protection and inhibits surge current
Protective module；
It is connect with the protective module, it is whole for carrying out all-wave to the power supply signal after overvoltage protection and inhibition surge current
The rectification module of stream；
It is connect with the rectification module, for carrying out the filter module of common mode filtering to the power supply signal after full-wave rectification；
It is connect with the filter module, for carrying out the electrolytic module of electricity storage to the power supply signal after common mode filtering；
It is connect with the electrolytic module, the power supply signal for being stored according to electricity is connected, and output drive signal
And the switch module of voltage transformation is carried out to the power supply signal；
It is connect with the switch module, for exporting the feedback module of feedback signal according to the driving signal；And
It connect, is used in conjunction with the feedback signal, described in after voltage transformation with the switch module and the feedback module
After power supply signal carries out ripple processing, output optimizes electric signal to drive the output module of electric energy meter.
2. power circuit as described in claim 1, which is characterized in that the protective module includes:
First varistor, the second varistor, third varistor, the 15th resistance, the 16th resistance and the 17th electricity
Resistance；
The first end of first varistor and the A phase of the first termination three phase mains of the 15th resistance are held, institute
The B phase for stating the first end of the second varistor and the first termination three phase mains of the 16th resistance is held, the third
The first end of varistor and the C phase of the first termination three phase mains of the 17th resistance are held, the first pressure-sensitive electricity
The second termination three-phase electricity of the second end and the third varistor of the second end of resistance and second varistor
The of the zero curve in source, the second end of the second end of the 15th resistance and the 16th resistance and the 17th resistance
The two termination rectification modules.
3. power circuit as described in claim 1, which is characterized in that the rectification module includes:
First diode, the second diode, third diode, the 7th diode, the 8th diode, the 9th diode, the 12nd
Pole pipe and the 11st diode；
The cathode of 8th diode connects the anode of the first diode, and the cathode of the 9th diode connects described second
The anode of diode, the cathode of the tenth diode connect the anode of the third diode, the yin of the 11st diode
Pole connects the anode of the 7th diode, the anode of the 8th diode, the anode of the 9th diode, the described 12nd
The anode of the anode of pole pipe and the 11st diode connects the filter module, the cathode of the first diode, described
The cathode of second diode, the cathode of the third diode, the 7th diode cathode connect the filter module.
4. power circuit as described in claim 1, which is characterized in that the filter module includes:
First inductance, the second inductance, third inductance, the 7th common mode inductance and the 4th capacitor；
The first end of first termination first inductance of the 4th capacitor, the second termination third of first inductance
The first end of inductance, the first end of the first coil of the second termination the 7th common mode inductance of the third inductance, described the
The first end of second termination second inductance of four capacitors, the second termination the 7th common mode inductance of second inductance
The first end of second coil, the second end of first coil and the second end of the second coil of the 7th common mode inductance connect described
Electrolytic module.
5. power circuit as described in claim 1, which is characterized in that the electrolytic module includes:
5th electrolytic capacitor, the 6th electrolytic capacitor, the 29th resistance, the 30th resistance, the 31st resistance and the 30th
Two resistance；
The first end of first termination the 29th resistance of the 5th electrolytic capacitor, the second of the 29th resistance
Terminate the first end of the 30th resistance, the second end of the 5th electrolytic capacitor, the first end of the 6th electrolytic capacitor,
The second end of 30th resistance and the first end of the 31st resistance connect altogether, and the second of the 31st resistance
The first end of the 32nd resistance is terminated, the second of the 6th electrolytic capacitor terminates the second of the 32nd resistance
End.
6. power circuit as described in claim 1, which is characterized in that the switch module includes:
20th resistance, the 21st resistance, the 22nd resistance, the 23rd resistance, the 24th resistance, the 25th electricity
Resistance, Transient Suppression Diode, first resistor, second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance, the 8th
Capacitor, the 9th capacitor, the 21st capacitor, the 4th diode, field-effect tube, the 18th diode, switch chip, the first electricity
Appearance, the 22nd capacitor, the 7th capacitor and transformer；
The first termination electrolytic module of the 20th resistance, the second termination the described 21st of the 20th resistance
The first end of resistance, the first end of the second termination the 22nd resistance of the 21st resistance, the described 22nd
The first end of second termination the 23rd resistance of resistance, the second end and the described 24th of the 23rd resistance
The first end of resistance and the first end of the 25th resistance connect altogether, the second end of the 24th resistance and described the
The second end of 25 resistance and the first end of the Transient Suppression Diode connect altogether, the first end of the first resistor, institute
State the first end of second resistance, the first end of the 21st capacitor, the first end of the 8th capacitor, the 5th resistance
First end and the 9th capacitor the first termination transformer primary coil input terminal, the first resistor
The first end of the second termination 3rd resistor, the first end of the second termination the 4th resistance of the second resistance are described
The second end of 3rd resistor, the second end of the 4th resistance, the second end and the described 4th 2 of the 21st capacitor
The cathode of pole pipe connects altogether, and the second end of the 8th capacitor and the second end of the 9th capacitor are grounded, the 4th diode
Anode and the field-effect tube source electrode connect the transformer primary coil output end, the second end of the 5th resistance
Connecing the first end of the 6th resistance, the secondary coil of the transformer connects the output module, and the second of the 6th resistance
Terminate the first end of the first capacitor, anode and the field of the drain electrode of the switch chip with the 18th diode
The drain electrode of effect pipe connects altogether, and the cathode of the 18th diode connects the grid of the field-effect tube, the source of the switch chip
Pole connects the second end of the Transient Suppression Diode, and the bypass of the switch chip terminates the first end of the 22nd capacitor
And the first end of the 7th capacitor, the enabled termination feedback module of the switch chip, the of the first capacitor
Two ends connect altogether with the second end of the 22nd capacitor and the second end of the 7th capacitor.
7. power circuit as described in claim 1, which is characterized in that the output module includes:
7th resistance, the 8th resistance, the 5th diode, the 6th diode, the 11st capacitor, the 12nd capacitor, the 13rd capacitor,
14th capacitor, the 15th capacitor, the 16th capacitor, the 18th capacitor, the 79th capacitor and the 4th inductance；
The anode of first termination the 5th diode of the 7th resistance, the second termination the described tenth of the 7th resistance
The first end of one capacitor, the second end of the 11st capacitor, the cathode of the 5th diode, the 79th capacitor
First end and the first end of the 14th capacitor connect altogether and connect with the electric energy meter, and the second of the 79th capacitor
End and the second end of the 14th capacitor are grounded, the anode of the first termination the 6th diode of the 8th resistance, institute
State the first end of the second termination the 12nd capacitor of the 8th resistance, the second end of the 12nd capacitor, the described 6th 2
The cathode of pole pipe, the first end of the 13rd capacitor, the first end of the 15th capacitor and the 4th inductance
One end connects altogether, and the first of the second end of the 4th inductance and the first end of the 16th capacitor and the 18th capacitor
End connects altogether and connect with the electric energy meter, and the second end of the 16th capacitor and the second end of the 18th capacitor are grounded.
8. power circuit as described in claim 1, which is characterized in that the feedback module includes:
Photoelectrical coupler, the 9th resistance, the tenth resistance, eleventh resistor, twelfth resistor, thirteenth resistor, the 14th resistance,
19th capacitor, the 20th capacitor and voltage-stablizer；
The light-receiving device of the photoelectrical coupler connects the switch module, described in the input termination of the light emitting source of the photoelectrical coupler
The first end of 14th resistance, the first end of the second termination thirteenth resistor of the 14th resistance, the described 13rd
The output end of the light emitting source of the second termination photoelectrical coupler of resistance, the first end and described second of the 19th capacitor
The output end of the first end of ten capacitors and the voltage-stablizer connects altogether, the second termination of the 19th capacitor the 12nd electricity
The first end of resistance, the second end of the twelfth resistor, the second end of the 20th capacitor, the 9th resistance first
End, the first end of the tenth resistance and the first end of the eleventh resistor connect altogether, the second termination of the 9th resistance
The output module, the second end and the second end of the eleventh resistor and the input of the voltage-stablizer of the tenth resistance
End connects altogether.
9. a kind of three-phase kilowatt-hour meter system, including electric energy meter and for providing the three phase mains of power supply signal, which is characterized in that described
Three-phase kilowatt-hour meter system further includes such as the described in any item power circuits of claim 1-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910310347.9A CN110048622A (en) | 2019-04-17 | 2019-04-17 | A kind of power circuit and three-phase kilowatt-hour meter system for electric energy meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910310347.9A CN110048622A (en) | 2019-04-17 | 2019-04-17 | A kind of power circuit and three-phase kilowatt-hour meter system for electric energy meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110048622A true CN110048622A (en) | 2019-07-23 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910310347.9A Pending CN110048622A (en) | 2019-04-17 | 2019-04-17 | A kind of power circuit and three-phase kilowatt-hour meter system for electric energy meter |
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| Country | Link |
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| CN (1) | CN110048622A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116359603A (en) * | 2023-03-29 | 2023-06-30 | 江苏斯菲尔电气股份有限公司 | Three-phase electric energy meter circuit |
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| CN2552047Y (en) * | 2002-06-19 | 2003-05-21 | 深圳市跨宏实业有限公司 | Switch power with wide input voltage range |
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| CN104242616A (en) * | 2014-10-15 | 2014-12-24 | 国家电网公司 | Power supply circuit of multi-functional electric energy meter |
| CN108092529A (en) * | 2017-12-27 | 2018-05-29 | 浙江恒业电子有限公司 | A kind of Three phase electrical energy meter electricity source circuit |
| CN209896934U (en) * | 2019-04-17 | 2020-01-03 | 深圳龙电电气股份有限公司 | Power supply circuit for electric energy meter and three-phase electric meter system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2552047Y (en) * | 2002-06-19 | 2003-05-21 | 深圳市跨宏实业有限公司 | Switch power with wide input voltage range |
| CN102158092A (en) * | 2011-04-26 | 2011-08-17 | 武汉盛帆电子股份有限公司 | Three-phase buck type switch power supply module |
| CN104242616A (en) * | 2014-10-15 | 2014-12-24 | 国家电网公司 | Power supply circuit of multi-functional electric energy meter |
| CN108092529A (en) * | 2017-12-27 | 2018-05-29 | 浙江恒业电子有限公司 | A kind of Three phase electrical energy meter electricity source circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116359603A (en) * | 2023-03-29 | 2023-06-30 | 江苏斯菲尔电气股份有限公司 | Three-phase electric energy meter circuit |
| CN116359603B (en) * | 2023-03-29 | 2023-10-24 | 江苏斯菲尔电气股份有限公司 | Three-phase electric energy meter circuit |
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Address after: 518000 Guangdong city of Shenzhen province Nanshan District Nanyou 107 first industrial zone 3 Applicant after: Shenzhen Longdian Huaxin Holding Group Co., Ltd Address before: 518000 Guangdong city of Shenzhen province Nanshan District Nanyou 107 first industrial zone 3 Applicant before: SHENZHEN LONDIAN ELECTRICS Co.,Ltd. |