CN106973472A - A kind of electronic energy-saving lamp pulse current suppressive integral control circuit - Google Patents
A kind of electronic energy-saving lamp pulse current suppressive integral control circuit Download PDFInfo
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- CN106973472A CN106973472A CN201710202034.2A CN201710202034A CN106973472A CN 106973472 A CN106973472 A CN 106973472A CN 201710202034 A CN201710202034 A CN 201710202034A CN 106973472 A CN106973472 A CN 106973472A
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- triode
- polar capacitor
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/10—Controlling the light source
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The invention discloses a kind of electronic energy-saving lamp pulse current suppressive integral control circuit, mainly by transformer T1, transformer T2, unidirectional thyristor VS, triode VT1, triode VT2, triode VT3, triode VT4, FET MOS, amplifier P, polar capacitor C2, resistance R11, and the polar capacitor C5 for the output end that positive pole is connected after diode D4 with triode VT2 emitter stage, negative pole and transformer T2 secondary inductance coils L5 Same Name of Ends are collectively forming double variable-pressures control circuits are constituted.The present invention can carry out boosting twice to voltage by dual transformer and handle, and the present invention can also carry out effective adjustment or buffering to the impulse wave of voltage, make voltage more steady, more stable, ensure that the present invention can export the voltage of stabilization.
Description
Technical field
Circuit is controlled the present invention relates to one kind, is a kind of electronic energy-saving lamp pulse current suppressive specifically
Integral control circuit.
Background technology
Electronic energy-saving lamp is as novel energy-conserving light source, the features such as with its environmental protection, energy-conservation, long lifespan, small volume, by people
Receive and use extensively, electronic energy-saving lamp is then a kind of electricity-saving lamp for enjoying in electronic energy-saving lamp people to favor.Electric energy-saving
Lamp is a kind of sensitive semiconductor devices of characteristic, has negative temperature characteristic again, therefore in application process, electronic energy-saving lamp control
Circuit plays considerable effect for the working condition and service life for promoting electronic energy-saving lamp to be in stabilization.However, existing
With the presence of electric energy-saving lamp control circuit output voltage stability it is poor the problem of, brightness when causing the electronic energy-saving lamp to be lit
Flash, so as to have a strong impact on the life of people and the service life of electronic energy-saving lamp.
Therefore it provides a kind of electric energy-saving lamp control circuit that can improve output control voltage stability is when business
It is anxious.
The content of the invention
It is an object of the invention to overcome existing electric energy-saving lamp control circuit to there is lacking for output voltage stability difference
Fall into there is provided a kind of electronic energy-saving lamp pulse current suppressive integral control circuit.
The present invention is achieved through the following technical solutions：A kind of electronic energy-saving lamp integrated control electricity of pulse current suppressive
Road, mainly by control chip U2, diode rectifier U1, triode VT1, triode VT2, triode VT3, triode VT4, field
Effect pipe MOS, amplifier P, diode D1, positive pole are connected after inductance L with diode rectifier U1 one of input
Connect, the polar capacitor C1 that negative pole is connected with diode rectifier U another input, one end and polar capacitor C1 positive pole
It is connected, the other end and polar capacitor C1 negative pole are collectively forming the fuse FU of integral control circuit, positive pole is whole with diode
The polarity electricity that stream device U1 cathode output end is connected, negative pole is grounded after being connected with diode rectifier U1 cathode output end
Hold C2, the pole that negative pole is connected with control chip U2 VDD pins, positive pole is connected after resistance R3 with diode D1 N poles
Property electric capacity C5, positive pole is connected after resistance R1 with diode D1 N poles, negative pole is connected with triode VT1 colelctor electrode
Polar capacitor C3, negative pole is connected with control chip U2 CPH pins, the pole that positive pole is connected with triode VT1 emitter stage
Property electric capacity C4, it is adjustable that one end is connected with control chip U2 RT pins, the other end is connected with triode VT1 emitter stage
The diode D4 that resistance R2, P pole is connected with control chip U2 SGND pins, N poles are connected with triode VT1 base stage,
Positive pole is connected after resistance R4 with diode D1 P poles, negative pole is connected after resistance R6 with control chip U2 VDC pins
Polar capacitor C6, N pole be connected with polar capacitor C5 positive pole, base stage of the P poles with triode VT3 after resistance R8 is connected
Diode D2, N pole be connected after resistance R5 with polar capacitor C5 positive pole, hair of the N poles after resistance R7 with triode VT2
The diode D3 that emitter-base bandgap grading is connected, positive pole is connected with triode VT2 colelctor electrode, negative pole and control chip U2 OUT pins
The polar capacitor C7 being connected, positive pole is connected after resistance R9 with triode VT3 base stage, negative pole and amplifier P output
The polar capacitor C9 being connected is held, positive pole is connected with diode D3 P poles, negative pole is connected with triode VT3 emitter stage
Polar capacitor C8, positive pole is connected with FET MOS source electrode, colelctor electrode of the negative pole after resistance R11 with triode VT4
After polar capacitor C10, the P pole being connected is connected with polar capacitor C10 negative pole ground connection, N poles after adjustable resistance R12 with three
The diode D6 that pole pipe VT4 colelctor electrode is connected, positive pole is connected with FET MOS grid, negative pole and triode VT4
Polar capacitor C11, the P pole that is connected of base stage be connected with FET MOS grid, N poles after adjustable resistance R10 with putting
The diode D5 that big device P output end is connected, positive pole is connected after resistance R13 with amplifier P negative pole, negative pole and amplification
The polar capacitor C12 that device P output end is connected, and P poles be connected with amplifier P negative pole after ground connection, N poles are through resistance
The diode D7 compositions being connected after R14 with amplifier P output end；The drain electrode of the FET MOS is with triode VT1's
Colelctor electrode is connected；The emitter stage of the triode VT4 is connected with amplifier P positive pole；The P poles of the diode D1 also with
Diode rectifier U1 cathode output end is connected；The colelctor electrode of the triode VT1 is also negative with diode rectifier U1
Pole output end is connected；The VB pins of the control chip U2 are connected with triode VT2 base stage, its GND pin ground connection；Institute
Triode VT3 grounded collector, its base stage is stated also with control chip U2 OUT pins to be connected；The polar capacitor C9's
Negative pole and polar capacitor C8 positive pole are collectively forming the output end of integral control circuit.
To ensure the practical effect of the present invention, the control chip U2 is FAN7710 integrated chips；The diode
Rectifier U1 is the diode rectifier of 4 1N4001 diodes compositions.The triode VT1 and triode VT2 and three poles
Pipe VT3 is 3DG130 triodes, and the triode VT4 is 3DK9C triodes；The FET MOS is 02N60C3 effects
Ying Guan.
The present invention compared with prior art, with advantages below and beneficial effect：
(1) present invention can be suppressed or be eliminated to the Electromagnetic Interference in input voltage, and the present invention can also be to electricity
Pressure and the high transient state of electric current are adjusted, and prevent the frequency of electric current from drifting about, make voltage more steady, so as to improve the present invention
The stability of output control voltage, can effectively ensure the stability of brightness when electronic energy-saving lamp is lit, while can be well
The requirement of people is met, the service life of electronic energy-saving lamp is extended well.
(2) present invention can be adjusted to frequency, the pulsewidth of pulse current, can make output voltage and constant current hold,
Effectively the stabilization of power output is ensured, so as to pass through the stability of output voltage of the present invention.
Brief description of the drawings
Fig. 1 is integrated circuit structural representation of the invention.
Embodiment
The present invention is described in further detail with reference to embodiment and its accompanying drawing, but embodiments of the present invention are not
It is limited to this.
As shown in figure 1, the present invention is main by control chip U2, diode rectifier U1, triode VT1, triode VT2,
Triode VT3, triode VT4, FET MOS, amplifier P, fuse FU, resistance R1, adjustable resistance R2, resistance R3, electricity
R4, resistance R5, resistance R6, resistance R7, resistance R8, resistance R9, adjustable resistance R10, resistance R11, resistance R12, resistance R13 are hindered,
Resistance R14, polar capacitor C1, polar capacitor C2, polar capacitor C3, polar capacitor C4, polar capacitor C5, polar capacitor C6, pole
Property electric capacity C7, polar capacitor C8, polar capacitor C9, polar capacitor C10, polar capacitor C11, polar capacitor C12, diode D1,
Diode D2, diode D3, diode D4, diode D5, diode D6, diode D7, and inductance L are constituted.
To ensure the practical effect of the present invention, the control chip U2 is FAN7710 integrated chips；The diode
Rectifier U1 is the diode rectifier of 4 1N4001 diodes compositions.The triode VT1 and triode VT2 and three poles
Pipe VT3 is 3DG130 triodes, and triode VT4 is 3DK9C triodes；The FET MOS is 02N60C3 field-effects
Pipe；Meanwhile, amplifier P is OP364 amplifiers；Fuse FU fusing value is 1A/250V；Resistance R1 resistance is 100k Ω,
Adjustable resistance R2 Standard resistance range is 10~82k Ω, and resistance R3~R5 resistance is 8 Ω, and resistance R6~R8 resistance is
10k Ω, resistance R9 resistance are 330k Ω, and adjustable resistance R10 Standard resistance range is 100~200k Ω, resistance R11 and resistance
The resistance that R12 resistance is 100 Ω, resistance R13 and resistance R14 is 50k Ω；Polar capacitor C1 capacitance is 0.1 μ F/
400V, polar capacitor C2 are that filter capacitor its capacitance is 10 μ F/400V, and polar capacitor C3 capacitance is 4.7 μ F/25V, polarity electricity
It is that its capacitance of charging capacitor is 470 μ F/25V polar capacitor to hold C4 and polar capacitor C5, and polar capacitor C6 capacitance is 22 μ
F/50V, polar capacitor C7 capacitance are 100 μ F/25V, and polar capacitor C8 capacitance is 210 μ F/25V, polar capacitor C9 appearance
It is worth for 0.33 μ F/600V, polar capacitor C10 capacitance is equal for 220 μ F/25V, polar capacitor C11 and polar capacitor C12 capacitance
For 200 μ F/16V；Diode D1, diode D3 and diode D4 are 1N5404 diodes, and diode D2 is the poles of 1N4,002 bis-
Pipe, diode D5 and diode D6 are 1N4013 diodes, and diode D7 is 1N4009 diodes；Inductance L is 100 μ P magnetic
Core inductance.
During connection, polar capacitor C1 positive pole is connected after inductance L with diode rectifier U1 one of input
Connect, negative pole is connected with diode rectifier U another input.Fuse FU one end and polar capacitor C1 positive pole phase
Connection, the other end is collectively forming the input of integral control circuit with polar capacitor C1 negative pole and is connected with 220V civil powers.
Polar capacitor C2 positive pole is connected with diode rectifier U1 cathode output end, the negative pole of negative pole and diode rectifier U1
Output end is grounded after being connected.Polar capacitor C5 negative pole is connected with control chip U2 VDD pins, and positive pole is after resistance R3
It is connected with diode D1 N poles.Polar capacitor C3 positive pole is connected after resistance R1 with diode D1 N poles, negative pole with
Triode VT1 colelctor electrode is connected.Polar capacitor C4 negative pole is connected with control chip U2 CPH pins, positive pole and three
Pole pipe VT1 emitter stage is connected.
Wherein, adjustable resistance R2 one end is connected with control chip U2 RT pins, the hair of the other end and triode VT1
Emitter-base bandgap grading is connected.Diode D4 P poles are connected with control chip U2 SGND pins, and N poles are connected with triode VT1 base stage
Connect.Polar capacitor C6 positive pole is connected after resistance R4 with diode D1 P poles, negative pole after resistance R6 with control chip U2
VDC pins be connected.Diode D2 N poles are connected with polar capacitor C5 positive pole, P poles after resistance R8 with triode
VT3 base stage is connected.Positive pole of the diode D3 N poles with polar capacitor C5 after resistance R5 is connected, and N poles are after resistance R7
It is connected with triode VT2 emitter stage.Polar capacitor C7 positive pole is connected with triode VT2 colelctor electrode, negative pole and control
Coremaking piece U2 OUT pins are connected.Base stage of the polar capacitor C9 positive pole with triode VT3 after resistance R9 is connected, and bears
Pole is connected with triode VT1 colelctor electrode.
Meanwhile, polar capacitor C8 positive pole is connected with diode D3 P poles, the emitter stage phase of negative pole and triode VT3
Connection.Polar capacitor C10 positive pole is connected with FET MOS source electrode, and negative pole is after resistance R11 with triode VT4's
Colelctor electrode is connected.Diode D6 P poles are grounded after being connected with polar capacitor C10 negative pole, and N poles are after adjustable resistance R12
It is connected with triode VT4 colelctor electrode.Polar capacitor C11 positive pole is connected with FET MOS grid, negative pole and three
Pole pipe VT4 base stage is connected.Diode D5 P poles are connected with FET MOS grid, and N poles are after adjustable resistance R10
It is connected with amplifier P output end.Negative pole of the polar capacitor C12 positive pole with amplifier P after resistance R13 is connected, and bears
Pole is connected with amplifier P output end.Diode D7 P poles are grounded after being connected with amplifier P negative pole, and N poles are through resistance
Output end after R14 with amplifier P is connected.
The drain electrode of the FET MOS is connected with triode VT1 colelctor electrode；The emitter stage of the triode VT4
It is connected with amplifier P positive pole；Cathode output end of the P poles of the diode D1 also with diode rectifier U1 is connected；
Cathode output end of the colelctor electrode of the triode VT1 also with diode rectifier U1 is connected；The VB of the control chip U2
Pin is connected with triode VT2 base stage, its GND pin ground connection；The grounded collector of the triode VT3, its base stage is also
It is connected with control chip U2 OUT pins；The negative pole of the polar capacitor C9 is connected with electricity-saving lamp W one of electrode
Connect, polar capacitor C8 positive pole is then connected with electricity-saving lamp W another electrode.
During work, diode rectifier U1, polar capacitor C1, polar capacitor C2, inductance L and fuse FU formation all-wave are whole
Filter circuit, polar capacitor C9, resistance R8 and resistance R9 formation charge pump circuits are flowed, adjustable resistance R2 is that frequency adjusts resistance.
After power, the full-wave rectifier filter circuit carries out rectifying and wave-filtering to the alternating voltage of input, effectively to electromagnetic wave in voltage
Interference is suppressed or eliminated, and full-wave rectifier filter circuit carries out the startup of output voltage about 300V after rectification to the voltage of input
Voltage charges to polar capacitor C3.When the charging voltage on polar capacitor C3 reaches 13.5V, triode VT1 conductings, control chip
U2 obtains electric internal oscillator and started, and the oscillator in its control chip U2 vibrates on pre-heat frequency FPh, in oscillating current to one
Regularly, control chip U2 then output driving currents；Meanwhile, control chip U2 pressure feedback port output HIGH current is used as switch
The diode D4 conductings of diode, colelctor electrode of the high current through triode VT1 is transferred to FET MOS, triode VT4, pole
Property electric capacity C10, polar capacitor C11, polar capacitor C12, diode D5, diode D6, diode D7, adjustable resistance R10, resistance
R11, resistance R12, resistance R13 and the phase adjusting circuit of resistance R14 formation.
Wherein, the FET MOS of phase adjusting circuit, polar capacitor C10, polar capacitor C11, resistance R11, adjustable electric
R12 and diode D6 formation adjusters are hindered, the adjuster is adjusted to the pulse current frequency in high current, makes pulse current
Static frequency be consistent with dynamic frequency, emitter stage and polar capacitor C11 of the electric current after adjustment through triode VT4 are just
Pole is transferred to amplifier P, diode D5, diode D7, polar capacitor C12, adjustable resistance R10, resistance R12 and resistance R14 shapes
Into current detection circuit, the current detection circuit can reduce Leakage Current and loss current, and can suppress the different of output current
Ordinary wave is moved, and electric current is kept stable, and the electric current after phase adjusting circuit is then handled adjustment transmits triode VT2, triode
VT3, polar capacitor C7, polar capacitor C8 and the pulse current amplifying circuit of resistance R formation, the current amplification circuit are adjusted
Make driving current more stable, and make the pulse frequency of driving current stronger, can effectively shorten electronic energy-saving lamp W startup when
Between, current amplification circuit by after processing driving current supply electronic energy-saving lamp W, electronic energy-saving lamp W obtain it is electric be lit,
The present invention can be suppressed or be eliminated to the Electromagnetic Interference in input voltage, and the present invention can also to voltage and
The high transient state of electric current is adjusted, and prevents the frequency of electric current from drifting about, makes voltage more steady, so as to improve output of the present invention
The stability of control voltage；Meanwhile, the present invention can be adjusted to frequency, the pulsewidth of pulse current, can make output voltage and electricity
Stream keeps constant, effectively ensures the stabilization of power output, so that passed through the stability of output voltage of the present invention, therefore this hair
It is bright effectively to ensure the stability of brightness when electronic energy-saving lamp is lit, while being well positioned to meet the requirement of people, very
The good service life for extending electronic energy-saving lamp.
According to above-described embodiment, you can realize the present invention well.
Claims (5)
1. a kind of electronic energy-saving lamp pulse current suppressive integral control circuit, it is characterised in that mainly by control chip U2,
Diode rectifier U1, triode VT1, triode VT2, triode VT3, triode VT4, FET MOS, amplifier P, two
Pole pipe D1, positive pole is connected after inductance L with diode rectifier U1 one of input, negative pole and diode rectifier
The polar capacitor C1 that U another input is connected, one end is connected with polar capacitor C1 positive pole, the other end and polarity are electric
The negative pole for holding C1 is collectively forming the fuse FU of integral control circuit, and positive pole is connected with diode rectifier U1 cathode output end
Connect, the polar capacitor C2 that negative pole is grounded after being connected with diode rectifier U1 cathode output end, negative pole and control chip U2
VDD pins be connected, the polar capacitor C5 that positive pole is connected after resistance R3 with diode D1 N poles, positive pole is through resistance R1
Be connected afterwards with diode D1 N poles, the polar capacitor C3 that negative pole is connected with triode VT1 colelctor electrode, negative pole with control
The polar capacitor C4 that chip U2 CPH pins are connected, positive pole is connected with triode VT1 emitter stage, one end and control core
Piece U2 RT pins are connected, the other end is connected with triode VT1 emitter stage adjustable resistance R2, P pole and control chip
The diode D4 that U2 SGND pins are connected, N poles are connected with triode VT1 base stage, positive pole after resistance R4 with two poles
Pipe D1 P poles are connected, negative pole is connected after resistance R6 with control chip U2 VDC pins polar capacitor C6, N pole and pole
Property electric capacity C5 positive pole is connected, the diode D2 that P poles are connected after resistance R8 with triode VT3 base stage, and N poles are through resistance
Be connected after R5 with polar capacitor C5 positive pole, the diode that N poles are connected after resistance R7 with triode VT2 emitter stage
D3, the polar capacitor C7 that positive pole is connected with triode VT2 colelctor electrode, negative pole is connected with control chip U2 OUT pins,
Positive pole is connected after resistance R9 with triode VT3 base stage, the polar capacitor that negative pole is connected with amplifier P output end
C9, the polar capacitor C8 that positive pole is connected with diode D3 P poles, negative pole is connected with triode VT3 emitter stage, positive pole with
The polar capacitor that FET MOS source electrode is connected, negative pole is connected after resistance R11 with triode VT4 colelctor electrode
Ground connection, colelctor electrode of the N poles after adjustable resistance R12 with triode VT4 after C10, P pole are connected with polar capacitor C10 negative pole
The diode D6 being connected, positive pole is connected with FET MOS grid, negative pole is connected with triode VT4 base stage
Polar capacitor C11, P pole is connected with FET MOS grid, output end of the N poles after adjustable resistance R10 with amplifier P
The diode D5 being connected, positive pole is connected after resistance R13 with amplifier P negative pole, negative pole and amplifier P output end phase
The polar capacitor C12 of connection, and P poles be connected with amplifier P negative pole after ground connection, N poles after resistance R14 with amplifier P
Output end be connected diode D7 composition；The drain electrode of the FET MOS is connected with triode VT1 colelctor electrode；
The emitter stage of the triode VT4 is connected with amplifier P positive pole；The P poles of the diode D1 also with diode rectifier
U1 cathode output end is connected；Cathode output end of the colelctor electrode of the triode VT1 also with diode rectifier U1 is connected
Connect；The VB pins of the control chip U2 are connected with triode VT2 base stage, its GND pin ground connection；The triode VT3
Grounded collector, its base stage is also connected with control chip U2 OUT pins；The negative pole of the polar capacitor C9 and polarity electricity
The positive pole for holding C8 is collectively forming the output end of integral control circuit.
2. a kind of electronic energy-saving lamp according to claim 1 pulse current suppressive integral control circuit, its feature exists
In the control chip U2 is FAN7710 integrated chips.
3. a kind of electronic energy-saving lamp according to claim 2 pulse current suppressive integral control circuit, its feature exists
In the diode rectifier U1 is the diode rectifier of 4 1N4001 diodes compositions.
4. a kind of electronic energy-saving lamp according to claim 3 pulse current suppressive integral control circuit, its feature exists
In the triode VT1 and triode VT2 and triode VT3 are 3DG130 triodes, and the triode VT4 is 3DK9C
Triode.
5. a kind of electronic energy-saving lamp according to claim 4 pulse current suppressive integral control circuit, its feature exists
In the FET MOS is 02N60C3 FETs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710202034.2A CN106973472A (en) | 2017-03-30 | 2017-03-30 | A kind of electronic energy-saving lamp pulse current suppressive integral control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710202034.2A CN106973472A (en) | 2017-03-30 | 2017-03-30 | A kind of electronic energy-saving lamp pulse current suppressive integral control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106973472A true CN106973472A (en) | 2017-07-21 |
Family
ID=59337292
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710202034.2A Pending CN106973472A (en) | 2017-03-30 | 2017-03-30 | A kind of electronic energy-saving lamp pulse current suppressive integral control circuit |
Country Status (1)
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| CN (1) | CN106973472A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109493673A (en) * | 2018-12-14 | 2019-03-19 | 国家电网有限公司 | Electric energy metering device wiring is just misidentifying training evaluation system |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106163003A (en) * | 2016-07-27 | 2016-11-23 | 成都翰道科技有限公司 | A kind of LED dimming drive power based on ripple peak restrained circuit |
-
2017
- 2017-03-30 CN CN201710202034.2A patent/CN106973472A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106163003A (en) * | 2016-07-27 | 2016-11-23 | 成都翰道科技有限公司 | A kind of LED dimming drive power based on ripple peak restrained circuit |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109493673A (en) * | 2018-12-14 | 2019-03-19 | 国家电网有限公司 | Electric energy metering device wiring is just misidentifying training evaluation system |
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Application publication date: 20170721 |