CN104730329A - Electric quantity detector - Google Patents
Electric quantity detector Download PDFInfo
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- CN104730329A CN104730329A CN201510162144.1A CN201510162144A CN104730329A CN 104730329 A CN104730329 A CN 104730329A CN 201510162144 A CN201510162144 A CN 201510162144A CN 104730329 A CN104730329 A CN 104730329A
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Abstract
The invention discloses an electric quantity detector. The electric quantity detector comprises a sensor circuit, an A/D switching circuit, a main control circuit, a display circuit and a power circuit, wherein the sensor circuit is connected with the A/D switching circuit in series, the main control circuit is connected with the A/D switching circuit, the display circuit and the power circuit, the sensor circuit is mainly composed of an alternating voltage sensor and an alternating current sensor and conducts current and voltage data acquisition, standard current and standard voltage are output after current and voltage are processed through the sensor circuit, standard current and standard voltage are then transmitted to the A/D switching circuit for analog-digital conversion, data obtained after conversion are transmitted to the main control circuit to be processed so that a result can be obtained, and the measurement result is displayed on a displayer through the display circuit. The electric quantity detector is high in measurement accuracy, wide in measurement range, low in cost and convenient to operate and has practical value.
Description
Technical field
The invention belongs to smart electronics instrument field, be specifically related to a kind of simple and practical electric power detection instrument.
Background technology
On market, electricity detector is of a great variety, but most of measuring accuracy of electric power detection instrument, the contradiction between measurement range and price are solved well, the price that measuring accuracy is high, scope is wide is also higher, therefore needs to seek that a kind of measurement range is wide, precision is higher and lower-cost electric power detection instrument.
Summary of the invention
In order to solve above-mentioned technical matters, the invention provides that a kind of measurement range is wide, precision is higher and lower-cost electric power detection instrument.
The technical solution adopted in the present invention is: a kind of electric power detection instrument, is characterized in that: comprise sensor circuit, A/D change-over circuit, governor circuit, display circuit, power circuit; Described sensor circuit and A/D change-over circuit are connected in series, and described governor circuit is connected with described A/D change-over circuit, display circuit, power circuit respectively; Described sensor circuit is primarily of AC voltage sensor and AC current sensor composition; Described sensor circuit carries out data acquisition to electric current and voltage, electric current and voltage are after described sensor circuit process, outputting standard electric current and voltage, normalized current and voltage carry out analog to digital conversion by being transmitted to described A/D change-over circuit, data after conversion send described governor circuit process to, obtain a result; Measurement result shows by described display circuit over the display.
As preferably, described electric power detection instrument also comprises reset circuit, is connected, for circuit reset with described governor circuit.
As preferably, described electric power detection instrument also comprises crystal oscillating circuit, is connected with described governor circuit, for described electric power detection instrument provides basic clock signal.
As preferably, described electric power detection instrument also comprises key circuit, is connected with described governor circuit, for controlling cut-offfing of described governor circuit.
As preferably, its core devices of described sensor circuit is AC voltage sensor WBV414AS3 and AC current sensor WBI414AS1; WBI414AS1 pin 6 is connected on pin 4 by resistance R7, pin 5,4 ground connection, and pin 3 is connected on+12V voltage, and pin 1,2 is connected on two slots of connector CON2 respectively; The pin 6 of WBV414AS3 is connected on pin 4 by resistance R8, pin 5,4 ground connection, and pin 3 is connected on+12V voltage, and pin 1,2 is connected on two slots of connector CON2 respectively.
As preferably, described governor circuit coordinates the core circuit that each circuit normally works, and its core devices is single-chip microcomputer STC12C5A60S2, the pin 1,2,3,4,5,6,7,8 of single-chip microcomputer STC12C5A60S2 stamps network label D0, D1, D2, D3, D4, D5, D6, D7 respectively, pin 9 stamps network label RST, pin 12, 13, 14, 15, 17, 18, 19 stamp network label KEY2 respectively, KEY1, B, A, C, X2, X1, pin 21, 22, 23, 24, 25, 26, 27, 28 stamp network label A respectively, B, C, EOC, P24, P25, P26, P27, pin 31 meets VCC by resistance R15, pin 32, 33, 34, 35, 36, 37, 38, 39 stamp network label P07 respectively, P06, P05, P04, P03, P02, P01, P00, pin 32, 33, 34, 35, 36, 37, 38, 39 are connected on resistance R14 respectively, R13, R6, R5, R4, R3, R2, R1.
As preferably, described its core devices of A/D change-over circuit is converter ADC0808; The pin 10,6,9,7 of converter ADC0808 stamps network label CLK, ST, OE, EOC respectively, pin 22 stamps network label ST, pin 22 is connected with pin 6, pin 23,24,25 stamps network label A, B, C respectively, and pin 17,14,15,8,18,19,20,21 stamps network label D0, D1, D2, D3, D4, D5, D6, D7 respectively; , pin 12 meets VCC, ground connection after pin 16,5,4,3,2,1,28 is in parallel, and pin 27 is by resistance R7 ground connection, and pin 26 is by resistance R8 ground connection.
As preferably, the core devices of described display circuit is group of four figures pipe LG3641 and triode S8550; The pin 11,7,4,2,1,10,5,3 of group of four figures pipe LG3641 is connected on resistance R1, R2, R3, R4, R5, R6, R13, R14 respectively; Q1, Q2, Q3, Q4 is made to represent the identical triode S8550 of 4 types respectively, then the emitter E of triode Q1 is connected on the pin 12 of charactron, the collector C of triode Q1 meets VCC, and the base stage B of triode Q1 is connected on one end of resistance R9, and the other end of resistance R9 stamps network label P24; The emitter E of triode Q2 is connected on the pin 9 of charactron, and the collector C of triode Q2 meets VCC, and the base stage B of triode Q2 is connected on one end of resistance R10, and the other end of resistance R10 stamps network label P25; The emitter E of triode Q3 is connected on the pin 8 of charactron, and the collector C of triode Q3 meets VCC, and the base stage B of triode Q3 is connected on one end of resistance R11, and the other end of resistance R11 stamps network label P26; The emitter E of triode Q4 is connected on the pin 6 of charactron, and the collector C of triode Q4 meets VCC, and the base stage B of triode Q4 is connected on one end of resistance R12, and the other end of resistance R12 stamps network label P27.
As preferably, the core devices of described reset circuit is 10uF/35V electrolytic condenser C1; The positive pole of electrolytic condenser C1 meets VCC, and the negative pole of electrolytic condenser C1 is by resistance R17 ground connection; Button SW-PB is connected in parallel on the two ends of electrolytic condenser C1, and the negative pole of electrolytic condenser C1 stamps network label RST.
As preferably, the core devices of described crystal oscillating circuit is crystal oscillator G1; The two ends of crystal oscillator G1 stamp network label X1, X2 respectively, and one end of crystal oscillator G1 is by electric capacity C2 ground connection, and the other end is by electric capacity C3 ground connection.
As preferably, described key circuit, its first button SW-PB(J4) one end ground connection, one end meets VCC by resistance R18, and stamps network label KEY1 at the ungrounded end of button; Second button SW-PB(J5) one end ground connection, one end meets VCC by resistance R19, and stamps network label KEY2 at the ungrounded end of button.
As preferably, the main devices of described power circuit is transformer TRANS1 and integrated regulator 7805; 220V alternating voltage is connected on the side of transformer TRANS1; The opposite side of transformer TRANS1 is connected on 1,3 ends of bridge circuit BRIDGE1 respectively; 2,4 ends of bridge circuit BRIDGE1 are connected by polar capacitor C4; 2 ends of bridge circuit BRIDGE1 are connected on the positive pole of polar capacitor C4; Electric capacity C6 is connected in parallel on C4 two ends; The pin 1,2 of integrated regulator 7805 is connected by electric capacity C6; The pin 2,3 of integrated regulator 7805 is connected by polar capacitor C5; The pin 3 of integrated regulator 7805 is connected on the positive pole of polar capacitor C5; Pin 2 ground connection of integrated regulator 7805; Electric capacity C7, C8 are connected in parallel on C5 two ends; Resistance R16 mono-termination VCC, the other end is by LED ground connection.
The present invention utilizes single-chip microcomputer to complete the detection of electricity (voltage or electric current).First sensor circuit carries out data acquisition to electric current to be measured and voltage, outputting standard electric current after process, and normalized current is sent to converter AD0809 conversion process, data after conversion are transmitted to single-chip microcomputer process, calculate through single-chip microcomputer process, draw corresponding measurement result, and show on 48 segment numeral pipes.Measuring accuracy of the present invention is higher, and scope is comparatively wide, and cost is lower, easy to operate, has more practical value.
Accompanying drawing explanation
Fig. 1: the circuit theory diagrams of the embodiment of the present invention;
Fig. 2: the circuit diagram of the sensor circuit of the embodiment of the present invention, A/D change-over circuit, governor circuit and display circuit;
Fig. 3: the circuit diagram of the reset circuit of the embodiment of the present invention;
Fig. 4: the circuit diagram of the crystal oscillating circuit of the embodiment of the present invention;
Fig. 5: the circuit diagram of the key circuit of the embodiment of the present invention;
Fig. 6: the circuit diagram of the power circuit of the embodiment of the present invention.
Embodiment
Understand for the ease of those of ordinary skill in the art and implement the present invention, below in conjunction with drawings and Examples, the present invention is described in further detail, should be appreciated that exemplifying embodiment described herein is only for instruction and explanation of the present invention, is not intended to limit the present invention.
Ask for an interview Fig. 1, a kind of electric power detection instrument provided by the invention, comprises sensor circuit, A/D change-over circuit, governor circuit, display circuit, reset circuit, crystal oscillating circuit, key circuit, power circuit; Reset circuit is used for circuit reset; Crystal oscillating circuit provides basic clock signal for electric power detection instrument; Key circuit is for controlling cut-offfing of governor circuit; Sensor circuit and A/D change-over circuit are connected in series, and governor circuit is connected with A/D change-over circuit, display circuit, reset circuit, crystal oscillating circuit, key circuit, power circuit respectively; Sensor circuit is primarily of AC voltage sensor and AC current sensor composition; Sensor circuit carries out data acquisition to electric current and voltage, electric current and voltage after sensor circuit process, outputting standard electric current and voltage, normalized current and voltage will be transmitted to A/D change-over circuit and carry out analog to digital conversion, data after conversion send governor circuit process to, obtain a result; Measurement result shows by display circuit over the display.
Ask for an interview Fig. 2, its core devices of the sensor circuit of the present embodiment is AC voltage sensor WBV414AS3 and AC current sensor WBI414AS1; WBI414AS1 pin 6 is connected on pin 4 by resistance R7, pin 5,4 ground connection, and pin 3 is connected on+12V voltage, and pin 1,2 is connected on two slots of connector CON2 respectively; The pin 6 of WBV414AS3 is connected on pin 4 by resistance R8, pin 5,4 ground connection, and pin 3 is connected on+12V voltage, and pin 1,2 is connected on two slots of connector CON2 respectively.
Ask for an interview Fig. 2, the governor circuit of the present embodiment is the core circuit that each circuit of coordination normally works, and its core devices is single-chip microcomputer STC12C5A60S2, the pin 1,2,3,4,5,6,7,8 of single-chip microcomputer STC12C5A60S2 stamps network label D0, D1, D2, D3, D4, D5, D6, D7 respectively, pin 9 stamps network label RST, pin 12, 13, 14, 15, 17, 18, 19 stamp network label KEY2 respectively, KEY1, B, A, C, X2, X1, pin 21, 22, 23, 24, 25, 26, 27, 28 stamp network label A respectively, B, C, EOC, P24, P25, P26, P27, pin 31 meets VCC by resistance R15, pin 32, 33, 34, 35, 36, 37, 38, 39 stamp network label P07 respectively, P06, P05, P04, P03, P02, P01, P00, pin 32, 33, 34, 35, 36, 37, 38, 39 are connected on resistance R14 respectively, R13, R6, R5, R4, R3, R2, R1.
Ask for an interview Fig. 2, its core devices of A/D change-over circuit of the present embodiment is converter ADC0808; The pin 10,6,9,7 of converter ADC0808 stamps network label CLK, ST, OE, EOC respectively, pin 22 stamps network label ST, pin 22 is connected with pin 6, pin 23,24,25 stamps network label A, B, C respectively, and pin 17,14,15,8,18,19,20,21 stamps network label D0, D1, D2, D3, D4, D5, D6, D7 respectively; , pin 12 meets VCC, ground connection after pin 16,5,4,3,2,1,28 is in parallel, and pin 27 is by resistance R7 ground connection, and pin 26 is by resistance R8 ground connection.
Ask for an interview Fig. 2, the core devices of the display circuit of the present embodiment is group of four figures pipe LG3641 and triode S8550; The pin 11,7,4,2,1,10,5,3 of group of four figures pipe LG3641 is connected on resistance R1, R2, R3, R4, R5, R6, R13, R14 respectively; Q1, Q2, Q3, Q4 is made to represent the identical triode S8550 of 4 types respectively, then the emitter E of triode Q1 is connected on the pin 12 of charactron, the collector C of triode Q1 meets VCC, and the base stage B of triode Q1 is connected on one end of resistance R9, and the other end of resistance R9 stamps network label P24; The emitter E of triode Q2 is connected on the pin 9 of charactron, and the collector C of triode Q2 meets VCC, and the base stage B of triode Q2 is connected on one end of resistance R10, and the other end of resistance R10 stamps network label P25; The emitter E of triode Q3 is connected on the pin 8 of charactron, and the collector C of triode Q3 meets VCC, and the base stage B of triode Q3 is connected on one end of resistance R11, and the other end of resistance R11 stamps network label P26; The emitter E of triode Q4 is connected on the pin 6 of charactron, and the collector C of triode Q4 meets VCC, and the base stage B of triode Q4 is connected on one end of resistance R12, and the other end of resistance R12 stamps network label P27.
Ask for an interview Fig. 3, the core devices of the reset circuit of the present embodiment is 10uF/35V electrolytic condenser C1; The positive pole of electrolytic condenser C1 meets VCC, and the negative pole of electrolytic condenser C1 is by resistance R17 ground connection; Button SW-PB is connected in parallel on the two ends of electrolytic condenser C1, and the negative pole of electrolytic condenser C1 stamps network label RST.
Ask for an interview Fig. 4, the core devices of the crystal oscillating circuit of the present embodiment is crystal oscillator G1; The two ends of crystal oscillator G1 stamp network label X1, X2 respectively, and one end of crystal oscillator G1 is by electric capacity C2 ground connection, and the other end is by electric capacity C3 ground connection.
Ask for an interview Fig. 5, the key circuit of the present embodiment, its first button SW-PB(J4) one end ground connection, one end meets VCC by resistance R18, and stamps network label KEY1 at the ungrounded end of button; Second button SW-PB(J5) one end ground connection, one end meets VCC by resistance R19, and stamps network label KEY2 at the ungrounded end of button.
Ask for an interview Fig. 6, the power circuit of the present embodiment its provide power supply for whole detector, ensure that detector normally runs; Its main devices is transformer TRANS1 and integrated regulator 7805; 220V alternating voltage is connected on the side of transformer TRANS1; The opposite side of transformer TRANS1 is connected on 1,3 ends of bridge circuit BRIDGE1 respectively; 2,4 ends of bridge circuit BRIDGE1 are connected by polar capacitor C4; 2 ends of bridge circuit BRIDGE1 are connected on the positive pole of polar capacitor C4; Electric capacity C6 is connected in parallel on C4 two ends; The pin 1,2 of integrated regulator 7805 is connected by electric capacity C6; The pin 2,3 of integrated regulator 7805 is connected by polar capacitor C5; The pin 3 of integrated regulator 7805 is connected on the positive pole of polar capacitor C5; Pin 2 ground connection of integrated regulator 7805; Electric capacity C7, C8 are connected in parallel on C5 two ends; Resistance R16 mono-termination VCC, the other end is by LED ground connection.
Electric power detection instrument of the present invention connects measured signal, powers, run by key control circuit to each circuit, can read concrete electricity (voltage or electric current) value after operation on charactron.
Should be understood that, the part that this instructions does not elaborate all belongs to prior art.
Should be understood that; the above-mentioned description for preferred embodiment is comparatively detailed; therefore the restriction to scope of patent protection of the present invention can not be thought; those of ordinary skill in the art is under enlightenment of the present invention; do not departing under the ambit that the claims in the present invention protect; can also make and replacing or distortion, all fall within protection scope of the present invention, request protection domain of the present invention should be as the criterion with claims.
Claims (12)
1. an electric power detection instrument, is characterized in that: comprise sensor circuit, A/D change-over circuit, governor circuit, display circuit, power circuit; Described sensor circuit and A/D change-over circuit are connected in series, and described governor circuit is connected with described A/D change-over circuit, display circuit, power circuit respectively; Described sensor circuit is primarily of AC voltage sensor and AC current sensor composition; Described sensor circuit carries out data acquisition to electric current and voltage, electric current and voltage are after described sensor circuit process, outputting standard electric current and voltage, normalized current and voltage carry out analog to digital conversion by being transmitted to described A/D change-over circuit, data after conversion send described governor circuit process to, obtain a result; Measurement result shows by described display circuit over the display.
2. electric power detection instrument according to claim 1, is characterized in that: described electric power detection instrument also comprises reset circuit, is connected, for circuit reset with described governor circuit.
3. electric power detection instrument according to claim 1, is characterized in that: described electric power detection instrument also comprises crystal oscillating circuit, is connected with described governor circuit, for described electric power detection instrument provides basic clock signal.
4. electric power detection instrument according to claim 1, is characterized in that: described electric power detection instrument also comprises key circuit, is connected with described governor circuit, for controlling cut-offfing of described governor circuit.
5. electric power detection instrument according to claim 1, is characterized in that: its core devices of described sensor circuit is AC voltage sensor WBV414AS3 and AC current sensor WBI414AS1; WBI414AS1 pin 6 is connected on pin 4 by resistance R7, pin 5,4 ground connection, and pin 3 is connected on+12V voltage, and pin 1,2 is connected on two slots of connector CON2 respectively; The pin 6 of WBV414AS3 is connected on pin 4 by resistance R8, pin 5,4 ground connection, and pin 3 is connected on+12V voltage, and pin 1,2 is connected on two slots of connector CON2 respectively.
6. electric power detection instrument according to claim 1, is characterized in that: described governor circuit is the core circuit that each circuit of coordination normally works, and its core devices is single-chip microcomputer STC12C5A60S2, the pin 1,2,3,4,5,6,7,8 of single-chip microcomputer STC12C5A60S2 stamps network label D0, D1, D2, D3, D4, D5, D6, D7 respectively, pin 9 stamps network label RST, pin 12, 13, 14, 15, 17, 18, 19 stamp network label KEY2 respectively, KEY1, B, A, C, X2, X1, pin 21, 22, 23, 24, 25, 26, 27, 28 stamp network label A respectively, B, C, EOC, P24, P25, P26, P27, pin 31 meets VCC by resistance R15, pin 32, 33, 34, 35, 36, 37, 38, 39 stamp network label P07 respectively, P06, P05, P04, P03, P02, P01, P00, pin 32, 33, 34, 35, 36, 37, 38, 39 are connected on resistance R14 respectively, R13, R6, R5, R4, R3, R2, R1.
7. electric power detection instrument according to claim 1, is characterized in that: described its core devices of A/D change-over circuit is converter ADC0808; The pin 10,6,9,7 of converter ADC0808 stamps network label CLK, ST, OE, EOC respectively, pin 22 stamps network label ST, pin 22 is connected with pin 6, pin 23,24,25 stamps network label A, B, C respectively, and pin 17,14,15,8,18,19,20,21 stamps network label D0, D1, D2, D3, D4, D5, D6, D7 respectively; , pin 12 meets VCC, ground connection after pin 16,5,4,3,2,1,28 is in parallel, and pin 27 is by resistance R7 ground connection, and pin 26 is by resistance R8 ground connection.
8. electric power detection instrument according to claim 1, is characterized in that: the core devices of described display circuit is group of four figures pipe LG3641 and triode S8550; The pin 11,7,4,2,1,10,5,3 of group of four figures pipe LG3641 is connected on resistance R1, R2, R3, R4, R5, R6, R13, R14 respectively; Q1, Q2, Q3, Q4 is made to represent the identical triode S8550 of 4 types respectively, then the emitter E of triode Q1 is connected on the pin 12 of charactron, the collector C of triode Q1 meets VCC, and the base stage B of triode Q1 is connected on one end of resistance R9, and the other end of resistance R9 stamps network label P24; The emitter E of triode Q2 is connected on the pin 9 of charactron, and the collector C of triode Q2 meets VCC, and the base stage B of triode Q2 is connected on one end of resistance R10, and the other end of resistance R10 stamps network label P25; The emitter E of triode Q3 is connected on the pin 8 of charactron, and the collector C of triode Q3 meets VCC, and the base stage B of triode Q3 is connected on one end of resistance R11, and the other end of resistance R11 stamps network label P26; The emitter E of triode Q4 is connected on the pin 6 of charactron, and the collector C of triode Q4 meets VCC, and the base stage B of triode Q4 is connected on one end of resistance R12, and the other end of resistance R12 stamps network label P27.
9. electric power detection instrument according to claim 2, is characterized in that: the core devices of described reset circuit is 10uF/35V electrolytic condenser C1; The positive pole of electrolytic condenser C1 meets VCC, and the negative pole of electrolytic condenser C1 is by resistance R17 ground connection; Button SW-PB is connected in parallel on the two ends of electrolytic condenser C1, and the negative pole of electrolytic condenser C1 stamps network label RST.
10. electric power detection instrument according to claim 3, is characterized in that: the core devices of described crystal oscillating circuit is crystal oscillator G1; The two ends of crystal oscillator G1 stamp network label X1, X2 respectively, and one end of crystal oscillator G1 is by electric capacity C2 ground connection, and the other end is by electric capacity C3 ground connection.
11. electric power detection instrument according to claim 4, is characterized in that: described key circuit, its first button SW-PB(J4) one end ground connection, one end meets VCC by resistance R18, and stamps network label KEY1 at the ungrounded end of button; Second button SW-PB(J5) one end ground connection, one end meets VCC by resistance R19, and stamps network label KEY2 at the ungrounded end of button.
The 12. electric power detection instrument stated according to claim 1, is characterized in that: the main devices of described power circuit is transformer TRANS1 and integrated regulator 7805; 220V alternating voltage is connected on the side of transformer TRANS1; The opposite side of transformer TRANS1 is connected on 1,3 ends of bridge circuit BRIDGE1 respectively; 2,4 ends of bridge circuit BRIDGE1 are connected by polar capacitor C4; 2 ends of bridge circuit BRIDGE1 are connected on the positive pole of polar capacitor C4; Electric capacity C6 is connected in parallel on C4 two ends; The pin 1,2 of integrated regulator 7805 is connected by electric capacity C6; The pin 2,3 of integrated regulator 7805 is connected by polar capacitor C5; The pin 3 of integrated regulator 7805 is connected on the positive pole of polar capacitor C5; Pin 2 ground connection of integrated regulator 7805; Electric capacity C7, C8 are connected in parallel on C5 two ends; Resistance R16 mono-termination VCC, the other end is by LED ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510162144.1A CN104730329A (en) | 2015-04-08 | 2015-04-08 | Electric quantity detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510162144.1A CN104730329A (en) | 2015-04-08 | 2015-04-08 | Electric quantity detector |
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| Publication Number | Publication Date |
|---|---|
| CN104730329A true CN104730329A (en) | 2015-06-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510162144.1A Pending CN104730329A (en) | 2015-04-08 | 2015-04-08 | Electric quantity detector |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105173936A (en) * | 2015-09-11 | 2015-12-23 | 浙江南奥电梯有限公司 | Elevator car internal temperature energy consumption display device |
| CN107465169A (en) * | 2017-09-13 | 2017-12-12 | 山东航海电器设备有限公司 | A kind of digital reverse-power relay |
| CN107707205A (en) * | 2017-10-26 | 2018-02-16 | 成都西井科技有限公司 | low-frequency power amplifier |
| CN107809219A (en) * | 2017-10-26 | 2018-03-16 | 成都西井科技有限公司 | The adjustable low-frequency power amplifier of attenuation amplitude |
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| CN202013378U (en) * | 2011-04-13 | 2011-10-19 | 广州市地下铁道总公司 | Digital electricity quantity metering device for subway electric passenger train |
| CN203551653U (en) * | 2013-10-15 | 2014-04-16 | 康迪 | A multifunctional electronic measurement apparatus |
| CN203929872U (en) * | 2013-12-31 | 2014-11-05 | 安徽鑫龙电器股份有限公司 | A kind of electrical measurement instrument |
| CN204129100U (en) * | 2014-11-06 | 2015-01-28 | 武汉大学 | A kind of resistance self-operated measuring unit |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2234622Y (en) * | 1994-12-27 | 1996-09-04 | 武晓愚 | Digital circuit device for measuring nonlinear electricity |
| CN202013378U (en) * | 2011-04-13 | 2011-10-19 | 广州市地下铁道总公司 | Digital electricity quantity metering device for subway electric passenger train |
| CN203551653U (en) * | 2013-10-15 | 2014-04-16 | 康迪 | A multifunctional electronic measurement apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105173936A (en) * | 2015-09-11 | 2015-12-23 | 浙江南奥电梯有限公司 | Elevator car internal temperature energy consumption display device |
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| CN107707205A (en) * | 2017-10-26 | 2018-02-16 | 成都西井科技有限公司 | low-frequency power amplifier |
| CN107809219A (en) * | 2017-10-26 | 2018-03-16 | 成都西井科技有限公司 | The adjustable low-frequency power amplifier of attenuation amplitude |
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Application publication date: 20150624 |