CN107478900A - A kind of AC power power factor isolation detection interface circuit - Google Patents

A kind of AC power power factor isolation detection interface circuit Download PDF

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Publication number
CN107478900A
CN107478900A CN201710687732.6A CN201710687732A CN107478900A CN 107478900 A CN107478900 A CN 107478900A CN 201710687732 A CN201710687732 A CN 201710687732A CN 107478900 A CN107478900 A CN 107478900A
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China
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resistance
potentiometer
circuit
coupler
photo
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CN107478900B (en
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严添明
陈金佳
郑晓青
江春梅
徐燎源
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Liming Vocational University
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Liming Vocational University
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R21/00—Arrangements for measuring electric power or power factor
    • G01R21/006—Measuring power factor
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
    • G01R1/30—Structural combination of electric measuring instruments with basic electronic circuits, e.g. with amplifier
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/22—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-emitting devices, e.g. LED, optocouplers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R21/00—Arrangements for measuring electric power or power factor
    • G01R21/06—Arrangements for measuring electric power or power factor by measuring current and voltage

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Measurement Of Current Or Voltage (AREA)
  • Amplifiers (AREA)

Abstract

The present invention relates to a kind of AC power power factor isolation detection interface circuit, including alternating voltage isolation detection circuit, alternating current isolation detection circuit, voltage x current amplifying circuit and power factor display interface circuit, the alternating voltage isolation detection circuit and alternating current isolation detection circuit are electrically connected by voltage x current amplifying circuit with power factor display interface circuit respectively.Solve the problems, such as that the big detection device volume of the power factor of existing AC power, weight weight, measurement inaccurately have phase shift, using dynamic frequency narrow range, price by the present invention.

Description

A kind of AC power power factor isolation detection interface circuit
Technical field
The present invention relates to detection circuit, more particularly to a kind of AC power power factor isolation detection interface circuit.
Background technology
The detection of the power factor of conventional AC power becomes typically by silicon steel chip isolating transformer or high-frequency isolation Depressor carries out isolation detection, human body is not got an electric shock, thus relatively safer.But silicon steel chip isolating transformer is present The problem of passband narrow (47HZ~63HZ), there is the problem of low frequency signal hardly possible coupling in high-frequency isolation transformer, and use silicon The problem of phase shift all be present in steel-sheet type isolating transformer or high-frequency isolation transformer isolation detection.At present, have on the market it is many every Traditional silicon steel chip isolating transformer and high-frequency isolation transformer, such as TPS5904 can be replaced from amplifier and isolation sensor Isolated amplifier, AD202 isolated amplifiers, voltage hall sensor, current Hall sensor etc., TPS5904 isolated amplifiers, AD202 isolated amplifiers, voltage hall sensor, current Hall sensor have performance is good, reliability is high, measurement is accurate, should With scope it is wide the advantages of, but their price is somewhat expensive, for the big user of demand, generally hangs back.
The content of the invention
Therefore, for it is above-mentioned the problem of, the present invention proposes a kind of AC power power factor isolation detection interface circuit, solution The detection device volume of the power factor for existing AC power of having determined is big, weight weight, measurement is inaccurate phase shift be present, using dynamic The problem of frequency range is narrow, price.
To achieve the above object, present invention employs following technical scheme：A kind of AC power power factor isolation detection Interface circuit, including alternating voltage isolation detection circuit, alternating current isolation detection circuit, voltage x current amplifying circuit and power Factor display interface circuit；
The voltage x current amplifying circuit include double integrated operatinoal amplifier IC28, resistance R182, resistance R183, resistance R184, Resistance R185, resistance R204, resistance R205, resistance R207, resistance R217, potentiometer RP30, potentiometer RP33, potentiometer RP36, potentiometer RP37, polar capacitor C137, polar capacitor C148, double integrated operatinoal amplifier IC28 are compared using twin voltage Device LM393, double integrated operatinoal amplifier IC28 VCC ends are connected with dc source, the first end of the resistance R182, resistance R183 first end, resistance R184 first end, resistance R185 first end are electric with double integrated operatinoal amplifier IC28 VCC ends respectively Connection, the second end of the resistance R182 positive terminal with polar capacitor C137, resistance R204 first end, double integrated fortune respectively Device IC28 1IN+ ends electrical connection is put, negative pole end and the alternating voltage isolation detection circuit output end of the electric capacity C137 are electrically connected Connect, the second end adjustment with resistance R205 first ends, potentiometer RP30 first end, potentiometer RP30 respectively of the resistance R183 End, double integrated operatinoal amplifier IC28 1IN- ends electrical connection, the second end of the potentiometer RP30 is with double integrated operatinoal amplifier IC28's 1OUT ends electrically connect, and the second end of the resistance R205 electrically connects with potentiometer RP37 first end, and the of the resistance R184 The 2IN+ ends with double integrated operatinoal amplifier IC28, polar capacitor C148 positive terminal, resistance R217 first end are electrically connected respectively at two ends Connect, the negative pole end of the polar capacitor C148 electrically connects with the output end of alternating current isolation detection circuit, the resistance R185 The second end the 2IN- ends with double integrated operatinoal amplifier IC28, resistance R207 first ends, potentiometer RP33 first end, current potential respectively Device RP33 adjustment end electrical connection, the 2OUT ends of double integrated operatinoal amplifier IC28 electrically connect with potentiometer RP33 the second end, The second end of the resistance R207 electrically connects with potentiometer RP36 first end, the ends of resistance R204 second, resistance R217 Two ends, the ends of potentiometer RP37 second, potentiometer RP37 adjustment ends, the ends of potentiometer RP36 second, potentiometer RP36 adjustment ends connect Ground；
The power factor display interface circuit includes twin voltage comparator IC39, two input XOR gate chip ICs 41, Resistance R228, resistance R232, resistance R233, resistance R235, resistance R236, resistance R237, resistance R241, resistance R242, current potential Device RP45, potentiometer RP46, the twin voltage comparator IC39 use twin voltage comparator LM393, the twin voltage comparator The vdd terminal of IC39 VCC ends and two input XOR gate chip ICs 41 is respectively connected with dc source, the twin voltage comparator IC39 VCC ends respectively with resistance R233 first ends, resistance R235 first ends, resistance R236 first ends, resistance R237 first ends Electrical connection, the 1IN- ends with twin voltage comparator IC39, resistance R241 first end are electric respectively at the second end of the resistance R233 Connection, the 2IN- ends with twin voltage comparator IC39, resistance R242 first end electrically connect respectively at the ends of resistance R235 second, The ends of R236 second the 1OUT ends with twin voltage comparator IC39, the A inputs of two input XOR gate chip ICs 41 respectively Electrical connection, the ends of R237 second the 2OUT ends with twin voltage comparator IC39, the B of two input XOR gate chip ICs 41 respectively Input electrically connects, and the first end of the resistance R232 electrically connects with double integrated operatinoal amplifier IC28 1OUT ends, the resistance The 1IN+ ends with twin voltage comparator IC39, potentiometer RP45 first ends electrically connect respectively at R232 the second end, the resistance R228 first end electrically connects with double integrated operatinoal amplifier IC28 2OUT ends, the second end of the resistance R228 respectively with twin voltage Comparator IC39 2IN+ ends, the electrical connection of potentiometer RP46 first ends, the second end of the resistance R241, the second of resistance R242 End, potentiometer RP45 the second end, potentiometer RP45 adjustment end, potentiometer RP46 the second end, potentiometer RP46 adjustment End, twin voltage comparator IC39 GND ends, the GND ends of two input XOR gate chip ICs 41 are grounded, and two input is different The XOR ends of OR gate chip IC 41 are power factor display interface circuit output end.
Further, the alternating voltage isolation detection circuit includes the first decompression current-limiting circuit, the filter of the first halfwave rectifier Wave circuit, the first accurate voltage stabilizing biasing circuit, the first light-coupled isolation modulation circuit, voltage sample circuit, the first blocking coupling electricity Hold, the first decompression current-limiting circuit output end is successively by the first halfwave rectifier filter circuit, the first accurate voltage stabilizing biased electrical Road, the first light-coupled isolation modulation circuit electrically connect with the polar capacitor C137 negative pole ends of voltage x current amplifying circuit, the voltage Sample circuit electrically connects through the first blocking coupled capacitor with the first light-coupled isolation modulation circuit；
The alternating current isolation detection circuit includes the second decompression current-limiting circuit, the second halfwave rectifier filter circuit, the Two accurate voltage stabilizing biasing circuits, the second light-coupled isolation modulation circuit, the second blocking coupled capacitor, the second decompression current-limiting circuit Output end is successively by the second halfwave rectifier filter circuit, the second accurate voltage stabilizing biasing circuit, the second light-coupled isolation modulation circuit Electrically connected with the polar capacitor C148 negative pole ends of voltage x current amplifying circuit, the variable-frequency power sources current sampling end by second every Straight coupled capacitor electrically connects with the second light-coupled isolation modulation circuit.
Further, the first light-coupled isolation modulation circuit includes resistance R180, resistance R192, resistance R199, light Coupler IC32, nonpolar electric capacity C132, the photo-coupler IC32 use photo-coupler PC817, the photo-coupler IC32 Anode tap and cathode terminal electrically connected respectively by resistance R192 and resistance R199 with the first voltage stabilizing biasing circuit, the optical coupling Device IC32 emitter stage electrically connects with the polar capacitor C137 negative pole ends of voltage x current amplifying circuit, the photo-coupler IC32's Colelctor electrode is electrically connected with dc source by resistance R180, and the colelctor electrode of the photo-coupler IC32 passes through nonpolar electric capacity C132 Ground connection；The second light-coupled isolation modulation circuit includes resistance R216, resistance R223, photo-coupler IC37, nonpolar electric capacity C143, the photo-coupler IC37 are led to respectively using photo-coupler PC187, the photo-coupler IC37 anode tap and cathode terminal Cross resistance R216 and resistance R223 to electrically connect with the second voltage stabilizing biasing circuit, emitter stage and the voltage electricity of the photo-coupler IC37 The polar capacitor C148 negative pole ends electrical connection of current amplifier, the colelctor electrode of the photo-coupler IC37 are electrically connected by resistance R206 Dc source is connected to, the emitter stage of the photo-coupler IC32 is also grounded by nonpolar electric capacity C143.
By using preceding solution, the beneficial effects of the invention are as follows：This AC power power factor isolation detection connects Mouth circuit has small volume, and in light weight, circuit structure is succinct, and cost is low, and waveform transfer precision height, good linearity, temperature coefficient are low The advantages of.Further, by the first optical coupling isolation circuit, the lossless no phase-shifted transmission of voltage isolation waveform, alternating current are realized Isolation detection circuit is galvanically isolated the lossless no phase-shifted transmission of waveform by the second optical coupling isolation circuit, realization.Detect AC power Wide frequency range：Frequency is less than 10Hz, and higher frequency is higher than 50kHz.
Brief description of the drawings
Fig. 1 is the overall structure block diagram of the embodiment of the present invention；
Fig. 2 is the integrated circuit schematic diagram of the embodiment of the present invention；
Fig. 3 is the alternating voltage isolation detection circuit schematic diagram of the embodiment of the present invention；
Fig. 4 is the alternating current isolation detection circuit schematic diagram of the embodiment of the present invention.
Embodiment
First, before embodiment is described, it is necessary to which some herein presented terms are explained.Herein It is middle to describe various elements using " first end ", " the second end ", only it is used for distinguishing the company between an element and another element Relation is connect, but these elements should not be limited by these terms.
In conjunction with the drawings and specific embodiments, the present invention is further described.
With reference to figure 1, Fig. 2, Fig. 3 and Fig. 4, the present embodiment provides a kind of AC power power factor isolation detection interface electricity Road, including alternating voltage isolation detection circuit 1, alternating current isolation detection circuit 2, voltage x current amplifying circuit 3, power factor Display interface circuit 4, dc source 5, AC supply voltage input 6 and AC power current sampling end 7.
It is steady that the alternating voltage isolation detection circuit 1 includes decompression current-limiting circuit 11, halfwave rectifier filter circuit 12, precision Press biasing circuit 13, light-coupled isolation modulation circuit 14, voltage sample circuit 15, blocking coupled capacitor 16.The decompression current limliting electricity Road 11 includes resistance R190 and resistance R197, and resistance R190 plays decompression metering function, and resistance R197 plays pressure limiting；The half-wave Current rectifying and wave filtering circuit 12 includes diode D36 and polar capacitor C135, and diode D36 plays halfwave rectifier, polar capacitor C135 plays filtering；The accurate voltage stabilizing biasing circuit 13 includes resistance R191, potentiometer RP32, polar capacitor C136, accurate three-terminal regulator block IC31, bias voltage is provided for photo-coupler IC32 by accurate voltage stabilizing biasing circuit 13, makes light Coupler IC32 is operated in the range of linearity；The optical coupling isolation circuit 14 includes resistance R180, resistance R192, resistance R199, light Coupler IC32, nonpolar electric capacity C132, resistance R192 and resistance R199 are isolation resistance, resistance R180 and nonpolar electric capacity C132 forms power supply decoupling circuit；The voltage sample circuit 15 includes resistance 178 and resistance R179, the blocking coupled capacitor 16 use photo-coupler PC817 using polar capacitor C131, the photo-coupler IC32.
The physical circuit connected mode of above-mentioned alternating voltage isolation detection circuit 1 is：The resistance R178 first ends and electricity Resistance R190 first end electrically connected respectively with AC supply voltage input 6, the ends of resistance R178 second respectively with resistance The negative pole end electrical connection of R179 first ends, polar capacitor C131, the second end ground connection of the resistance R179, the polar capacitor C131 positive terminal electrically connects with photo-coupler IC32 anode tap, the ends of resistance R190 second respectively with resistance R197 first End and diode D36 positive terminal electrically connect, the negative pole end of the diode D36 respectively with resistance R191 first ends and electric capacity C135 positive terminal electrical connection, the ends of resistance R191 second positive terminal with polar capacitor C136, accurate three-terminal voltage-stabilizing respectively Block IC31 output end, potentiometer RP32 first ends, the electrical connection of resistance R192 first ends, the ends of resistance R192 second and optocoupler Clutch IC32 anode taps electrically connect, and the adjustable side of the input and potentiometer RP32 of the accurate three-terminal regulator block IC31 is electrically connected Connect, the first end of the resistance R199 electrically connects with photo-coupler IC32 cathode terminals, the ends of resistance R197 second, resistance R199 Second end, the ends of potentiometer RP32 the 3rd, polar capacitor C135 negative pole ends, polar capacitor C136 negative pole ends, accurate three-terminal regulator block IC31 common port is all connected to shared line end NO, and the transmitting of the photo-coupler IC32 extremely exchanges detection voltage output end, The colelctor electrode of the photo-coupler IC32 is by resistance R180 connections dc source 5, and the colelctor electrode of the photo-coupler IC32 is also It is grounded by electric capacity C132.
It is steady that the alternating current isolation detection circuit 2 includes decompression current-limiting circuit 21, halfwave rectifier filter circuit 22, precision Biasing circuit 23, light-coupled isolation modulation circuit 24, blocking coupled capacitor 25 are pressed, the decompression current-limiting circuit 21 includes resistance R214 Metering function is played with resistance R219, resistance R214, resistance R219 plays antihypertensive effect；The halfwave rectifier filter circuit 22 includes two Pole pipe D41 and polar capacitor C146, diode D41 play halfwave rectifier, and polar capacitor C146 strobes；The precision Voltage stabilizing biasing circuit 23 includes resistance R215, potentiometer RP39, polar capacitor C147, accurate three-terminal regulator block IC36, passes through essence Close voltage stabilizing biasing circuit 23 provides bias voltage for photo-coupler IC37, photo-coupler IC37 is operated in the range of linearity；It is described Light-coupled isolation modulation circuit 24 includes resistance R206, resistance R216, resistance R223, photo-coupler IC37, nonpolar electric capacity C143, Resistance R216 and resistance R223 is isolation resistance, resistance R206 and nonpolar electric capacity C143 composition power supply decoupling circuits；It is described every Straight coupled capacitor 25 uses photo-coupler PC817 using polar capacitor C140, the photo-coupler IC32.
The physical circuit connected mode of above-mentioned alternating current isolation detection circuit 2 is：AC power current sampling end 7 passes through Polar capacitor C140 electrically connects with photo-coupler IC37 anode, the resistance R214 first ends and AC supply voltage input 6 electrical connections, positive terminal of the ends of resistance R214 second respectively with resistance R219 first ends and diode D41 electrically connects, described Positive terminal of the diode D41 negative pole end respectively with resistance R215 first ends and polar capacitor C146 electrically connects, the resistance The ends of R215 second positive terminal with polar capacitor C147, accurate three-terminal regulator block IC36 output end, potentiometer RP39 respectively One end, the electrical connection of resistance R216 first ends, the ends of resistance R216 second electrically connect with photo-coupler IC37 anode taps, the essence Close three-terminal regulator block IC36 input electrically connects with potentiometer RP39 adjustable side, the first end and optocoupler of the resistance R223 Clutch IC37 cathode terminals electrically connect, the ends of resistance R219 second, the ends of resistance R223 second, the ends of potentiometer RP39 the 3rd, polarity Electric capacity C146 negative pole ends, polar capacitor C147 negative pole ends, accurate three-terminal regulator block IC36 common port are all connected to shared line end NO, the photo-coupler IC37 transmitting extremely exchange detection current output terminal, and the colelctor electrode of the photo-coupler IC37 passes through Resistance R206 connections dc source 5, the colelctor electrode of the photo-coupler IC37 are also grounded by nonpolar electric capacity C143.
The voltage x current amplifying circuit include double integrated operatinoal amplifier IC28, resistance R182, resistance R183, resistance R184, Resistance R185, resistance R204, resistance R205, resistance R207, resistance R217, potentiometer RP30, potentiometer RP33, potentiometer RP36, potentiometer RP37, polar capacitor C137, polar capacitor C148, double integrated operatinoal amplifier IC28 are using double integrated transporting dischargings Device LM358, the VCC ends of double integrated operatinoal amplifier IC28 are powered by dc source 5, the first end of the resistance R182, electricity Hinder R183 first end, resistance R184 first end, resistance R185 first end the VCC ends with double integrated operatinoal amplifier IC28 respectively Electrical connection, the second end of the resistance R182 positive terminal with polar capacitor C137, resistance R204 respectively first end, double integrated Transport and placing device IC28 1IN+ ends electrical connection, the negative pole end of the electric capacity C137 electrically connect with photo-coupler IC32 emitter stage, institute State resistance R183 the second end respectively with resistance R205 first ends, potentiometer RP30 first ends, potentiometer RP30 adjustment end, double Integrated operatinoal amplifier IC28 1IN- ends electrical connection, the second end of the potentiometer RP30 and double integrated operatinoal amplifier IC28 1OUT ends Electrical connection, the second end of the resistance R205 electrically connect with potentiometer RP37 first end, the second end point of the resistance R184 The positive terminal at 2IN+ ends, polar capacitor C148, resistance R217 first end not with double integrated operatinoal amplifier IC28 electrically connect, described Polar capacitor C148 negative pole end electrically connects with photo-coupler IC37 emitter stage, the second end of the resistance R185 respectively with it is double Integrated operatinoal amplifier IC28 2IN- ends, resistance R207 first ends, potentiometer RP33 first end, potentiometer RP33 adjustment end electricity Connection, the 2OUT ends of double integrated operatinoal amplifier IC28 electrically connect with potentiometer RP33 the second end, and the of the resistance R207 Two ends electrically connect with potentiometer RP36 first end, the ends of resistance R204 second, the ends of resistance R217 second, potentiometer RP37 Two ends, potentiometer RP37 adjustment ends, the ends of potentiometer RP36 second, potentiometer RP36 adjustment ends are grounded respectively；
The power factor display interface circuit includes twin voltage comparator IC39, two input XOR gate chip ICs 41, Resistance R228, resistance R232, resistance R233, resistance R235, resistance R236, resistance R237, resistance R 241, resistance R242, current potential Device RP45, potentiometer RP46, the twin voltage comparator IC39 use twin voltage comparator LM393, the twin voltage comparator The vdd terminal of IC39 VCC ends and two input XOR gate chip ICs 41 is powered by dc source 5, and the twin voltage compares Device IC39 VCC ends respectively with resistance R233 first ends, resistance R235 first ends, resistance R236 first ends, resistance R237 first End electrical connection, the second end of the resistance R233 1IN- ends with twin voltage comparator IC39, resistance R241 first end respectively Electrical connection, the 2IN- ends with twin voltage comparator IC39, resistance R242 first end are electrically connected respectively at the ends of resistance R235 second Connect, the 1OUT ends with twin voltage comparator IC39, the A of two input XOR gate chip ICs 41 are inputted respectively at the ends of R236 second End electrical connection, the ends of R233 second the 2OUT ends with twin voltage comparator IC39, two input XOR gate chip ICs 41 respectively The electrical connection of B inputs, the first end of the resistance R232 electrically connects with pair integrated operatinoal amplifier IC28 1OUT ends, the resistance The 1IN+ ends with twin voltage comparator IC39, potentiometer RP45 first ends electrically connect respectively at R232 the second end, the resistance R228 first end electrically connects with double integrated operatinoal amplifier IC28 2OUT ends, the second end of the resistance R228 respectively with twin voltage Comparator IC39 2IN+ ends, the electrical connection of potentiometer RP46 first ends, the second end of the resistance R241, the second of resistance R242 End, potentiometer RP45 the second end, potentiometer RP45 adjustment end, potentiometer RP46 the second end, potentiometer RP46 adjustment End, twin voltage comparator IC39 GND ends, the GND ends of two input XOR gate chip ICs 41 are grounded, and two input is different The XOR ends of OR gate chip IC 41 are power factor display interface circuit output end.
The present invention uses light-coupled isolation modulation technique, realizes and isolates linear test problems and the lossless no phase-shifted transmission of waveform, In light weight with small volume, circuit structure is succinct, and cost is low, the advantages of waveform transfer precision height, good linearity, low temperature coefficient. Be not only suitable for the test application of general commercial product (47~63Hz), can also meet up to 400Hz military affairs, aviation electronics and Application demand in communication.Especially suitable for there is frequency conversion control device at scene, great-power electromagnetic starts, GPS high-frequency signals are wireless The occasion of R-T unit.Being widely used in electric power, remote monitoring, instrument and meter, Medical Devices, industrial automatic control etc. needs alternating current Source isolates the industry of observing and controlling power factor.
Above-mentioned alternating voltage isolation detection circuit 1 and alternating current isolation detection circuit 2 output end can also connect voltage Current power display circuit 8, for the voltage, electric current and power of isolation detection AC power, the voltage x current power is shown Circuit 8 includes power measurement chip IC 40, resistance R203, resistance R227, resistance R229, resistance R234, resistance R239, resistance It is R243, potentiometer RP42, potentiometer RP44, nonpolar electric capacity C151, nonpolar electric capacity C152, polar capacitor C153, nonpolar Electric capacity C158, nonpolar electric capacity C159, polar capacitor C171, polar capacitor C172, the power measurement chip IC 40 use work( Rate computation chip HLW8012, the VDD pins of the power measurement chip IC 40 pass through resistance R229 connection+5V power supplys, the work( Rate computation chip IC40 VDD pins are grounded by electric capacity C152, and the polar capacitor C153 is in parallel with nonpolar electric capacity C152, The V1P pins of the power measurement chip IC 40 electrically connect with polar capacitor C172 positive pole, the power measurement chip IC 40 V1P pins be also grounded respectively by resistance R234, nonpolar electric capacity C158, the negative pole of the polar capacitor C172 passes through current potential Device RP44 electrically connects with the photo-coupler IC32 emitter stages of alternating voltage isolation detection circuit 1, and the polar capacitor C172's is negative Pole is also grounded by resistance R239, and the V1N pins of the power measurement chip IC 40 pass through nonpolar electric capacity C159, resistance respectively R243 is grounded, and the V2P pins of the power measurement chip IC 40 pass sequentially through polar capacitor C171, potentiometer RP42 and alternating current The photo-coupler IC37 emitter stages electrical connection of isolation detection circuit 2 is flowed, the V2P pins of the power measurement chip IC 40 are also distinguished It is grounded by nonpolar electric capacity C151, resistance R227, the GND pin ground connection of the power measurement chip IC 40.Power measurement core Piece IC40 can measure power output, electric current and voltage square wave frequency values, and the CF pins output of power measurement chip IC 40 is active The square wave frequency value of power, the CF1 pins output current or voltage square wave frequency values of power measurement chip IC 40, uses power meter Measure the SEL pins selection of chip IC 40, when SEL pins are low level, the square wave frequency of the virtual value of CF1 pin output currents Value, when SEL pins are high level, the square wave frequency value of the virtual value of CF1 pin output voltages.
Although specifically showing and describing the present invention with reference to preferred embodiment, those skilled in the art should be bright In vain, do not departing from the spirit and scope of the present invention that appended claims are limited, in the form and details can be right The present invention makes a variety of changes, and is protection scope of the present invention.

Claims (3)

  1. A kind of 1. AC power power factor isolation detection interface circuit, it is characterised in that：Including alternating voltage isolation detection electricity Road, alternating current isolation detection circuit, voltage x current amplifying circuit and power factor display interface circuit；
    The voltage x current amplifying circuit includes double integrated operatinoal amplifier IC28, resistance R182, resistance R183, resistance R184, resistance R185, resistance R204, resistance R205, resistance R207, resistance R217, potentiometer RP30, potentiometer RP33, potentiometer RP36, electricity Position device RP37, polar capacitor C137, polar capacitor C148, double integrated operatinoal amplifier IC28 use double integrated operatinoal amplifier LM358, The VCC ends of double integrated operatinoal amplifier IC28 are connected with dc source, the first end of the resistance R182, the first of resistance R183 End, the VCC ends of resistance R184 first end, resistance R185 first end respectively with double integrated operatinoal amplifier IC28 electrically connect, described Resistance R182 the second end positive terminal with polar capacitor C137, resistance R204 first end, double integrated operatinoal amplifier IC28 respectively The electrical connection of 1IN+ ends, the negative pole end of the electric capacity C137 electrically connects with alternating voltage isolation detection circuit output end, the electricity Hinder R183 the second end respectively with resistance R205 first ends, potentiometer RP30 first ends, potentiometer RP30 adjustment end, double integrated Transport and placing device IC28 1IN- ends electrical connection, the second end of the potentiometer RP30 and double integrated operatinoal amplifier IC28 1OUT ends are electrically connected Connect, the second end of the resistance R205 electrically connects with potentiometer RP37 first end, the second end of the resistance R184 respectively with Double integrated operatinoal amplifier IC28 2IN+ ends, the first end electrical connection of polar capacitor C148 positive terminal, resistance R217, the polarity Electric capacity C148 negative pole end electrically connects with the output end of alternating current isolation detection circuit, the second end difference of the resistance R185 The adjustment at 2IN- ends, resistance R207 first end, potentiometer RP33 first end, potentiometer RP33 with double integrated operatinoal amplifier IC28 End electrical connection, the 2OUT ends of double integrated operatinoal amplifier IC28 electrically connect with potentiometer RP33 the second end, the resistance R207 The second end electrically connected with potentiometer RP36 first end, the ends of resistance R204 second, the ends of resistance R217 second, potentiometer The ends of RP37 second, potentiometer RP37 adjustment ends, the ends of potentiometer RP36 second, potentiometer RP36 adjustment ends are grounded；
    The power factor display interface circuit includes twin voltage comparator IC39, two input XOR gate chip ICs 41, resistance R228, resistance R232, resistance R233, resistance R235, resistance R236, resistance R237, resistance R241, resistance R242, potentiometer RP45, potentiometer RP46, the twin voltage comparator IC39 use twin voltage comparator LM393, the twin voltage comparator The vdd terminal of IC39 VCC ends and two input XOR gate chip ICs 41 is respectively connected with dc source, the twin voltage comparator IC39 VCC ends respectively with resistance R233 first ends, resistance R235 first ends, resistance R236 first ends, resistance R237 first ends Electrical connection, the 1IN- ends with twin voltage comparator IC39, resistance R241 first end are electric respectively at the second end of the resistance R233 Connection, the 2IN- ends with twin voltage comparator IC39, resistance R242 first end electrically connect respectively at the ends of resistance R235 second, The ends of R236 second the 1OUT ends with twin voltage comparator IC39, the A inputs of two input XOR gate chip ICs 41 respectively Electrical connection, the ends of R237 second the 2OUT ends with twin voltage comparator IC39, the B of two input XOR gate chip ICs 41 respectively Input electrically connects, and the first end of the resistance R232 electrically connects with double integrated operatinoal amplifier IC28 1OUT ends, the resistance The 1IN+ ends with twin voltage comparator IC39, potentiometer RP45 first ends electrically connect respectively at R232 the second end, the resistance R228 first end electrically connects with double integrated operatinoal amplifier IC28 2OUT ends, the second end of the resistance R228 respectively with twin voltage Comparator IC39 2IN+ ends, the electrical connection of potentiometer RP46 first ends, the second end of the resistance R241, the second of resistance R242 End, potentiometer RP45 the second end, potentiometer RP45 adjustment end, potentiometer RP46 the second end, potentiometer RP46 adjustment End, twin voltage comparator IC39 GND ends, the GND ends of two input XOR gate chip ICs 41 are grounded, and two input is different The XOR ends of OR gate chip IC 41 are power factor display interface circuit output end.
  2. A kind of 2. AC power power factor isolation detection interface circuit according to claim 1, it is characterised in that：It is described Alternating voltage isolation detection circuit is inclined including the first decompression current-limiting circuit, the first halfwave rectifier filter circuit, the first accurate voltage stabilizing Circuits, the first light-coupled isolation modulation circuit, voltage sample circuit, the first blocking coupled capacitor, the first decompression current limliting electricity Road output end is successively by the first halfwave rectifier filter circuit, the first accurate voltage stabilizing biasing circuit, the first light-coupled isolation modulation electricity Road electrically connects with the polar capacitor C137 negative pole ends of voltage x current amplifying circuit, and the voltage sample circuit couples through the first blocking Electric capacity electrically connects with the first light-coupled isolation modulation circuit；
    The alternating current isolation detection circuit includes the second decompression current-limiting circuit, the second halfwave rectifier filter circuit, the second essence Close voltage stabilizing biasing circuit, the second light-coupled isolation modulation circuit, the second blocking coupled capacitor, the second decompression current-limiting circuit output End is successively by the second halfwave rectifier filter circuit, the second accurate voltage stabilizing biasing circuit, the second light-coupled isolation modulation circuit and electricity The polar capacitor C148 negative pole ends electrical connection of piezoelectricity current amplifier, the second blocking coupling is passed through at the variable-frequency power sources current sampling end Electric capacity is closed to electrically connect with the second light-coupled isolation modulation circuit.
  3. A kind of 3. AC power power factor isolation detection interface circuit according to claim 2, it is characterised in that：It is described First light-coupled isolation modulation circuit includes resistance R180, resistance R192, resistance R199, photo-coupler IC32, nonpolar electric capacity C132, the photo-coupler IC32 are led to respectively using photo-coupler PC817, the photo-coupler IC32 anode tap and cathode terminal Cross resistance R192 and resistance R199 to electrically connect with the first voltage stabilizing biasing circuit, emitter stage and the voltage electricity of the photo-coupler IC32 The polar capacitor C137 negative pole ends electrical connection of current amplifier, the colelctor electrode of the photo-coupler IC32 are electrically connected by resistance R180 Dc source is connected to, the colelctor electrode of the photo-coupler IC32 is grounded by nonpolar electric capacity C132；Second light-coupled isolation Modulation circuit is adopted including resistance R216, resistance R223, photo-coupler IC37, nonpolar electric capacity C143, the photo-coupler IC37 With photo-coupler PC187, the anode tap and cathode terminal of the photo-coupler IC37 respectively by resistance R216 and resistance R223 with Second voltage stabilizing biasing circuit electrically connects, the emitter stage of the photo-coupler IC37 and the polar capacitor of voltage x current amplifying circuit C148 negative pole ends electrically connect, and the colelctor electrode of the photo-coupler IC37 is electrically connected with dc source, the light by resistance R206 Coupler IC32 emitter stage is also grounded by nonpolar electric capacity C143.
CN201710687732.6A 2017-08-11 2017-08-11 Alternating current power supply power factor isolation detection interface circuit Active CN107478900B (en)

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CN111077356A (en) * 2019-12-16 2020-04-28 广东格兰仕集团有限公司 Current detection circuit, method, apparatus and storage medium

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CN201322772Y (en) * 2008-12-11 2009-10-07 淮安信息职业技术学院 Automatic power factor recorder
CN204595075U (en) * 2015-05-08 2015-08-26 深圳市盈科互动科技有限公司 Power-fail detection circuit and device

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CN201322772Y (en) * 2008-12-11 2009-10-07 淮安信息职业技术学院 Automatic power factor recorder
CN204595075U (en) * 2015-05-08 2015-08-26 深圳市盈科互动科技有限公司 Power-fail detection circuit and device

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CN111077356A (en) * 2019-12-16 2020-04-28 广东格兰仕集团有限公司 Current detection circuit, method, apparatus and storage medium

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