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

Abstract

The present invention relates to an AC power source power factor isolation detection interface circuit, comprising an AC voltage isolation detection circuit, an AC current isolation detection circuit, a voltage and current amplification circuit and a power factor display interface circuit, the AC voltage isolation detection circuit and the AC current isolation detection circuit The circuits are respectively electrically connected with the power factor display interface circuit through the voltage and current amplifying circuit. The invention solves the problems of large volume, heavy weight, inaccurate measurement, phase shift, narrow dynamic frequency range and high price of the existing AC power factor detection equipment.

Description

An AC power source power factor isolation detection interface circuit

technical field

The invention relates to a detection circuit, in particular to an AC power factor isolation detection interface circuit.

Background technique

The detection of the power factor of the traditional AC power supply is usually carried out through the isolation detection of the silicon steel sheet type isolation transformer or the high frequency isolation transformer, so that the human body does not get an electric shock, which is relatively safe. However, the silicon steel sheet type isolation transformer has the problem of narrow passband (47HZ ~ 63HZ), and the high frequency isolation transformer has the problem of difficult coupling of low frequency signals, and there is a phase shift in the isolation detection of the silicon steel sheet type isolation transformer or high frequency isolation transformer. question. At present, there are many isolation amplifiers and isolation sensors on the market that can replace traditional silicon steel plate isolation transformers and high-frequency isolation transformers, such as TPS5904 isolation amplifiers, AD202 isolation amplifiers, voltage Hall sensors, current Hall sensors, etc., TPS5904 isolation amplifiers, AD202 isolation amplifier, voltage Hall sensor, and current Hall sensor have the advantages of good performance, high reliability, accurate measurement, and wide application range, but their prices are relatively expensive, and they are usually prohibitive for users with large demand.

Contents of the invention

Therefore, in view of the above-mentioned problems, the present invention proposes a power factor isolation detection interface circuit of an AC power supply, which solves the problem that the power factor detection equipment of the existing AC power supply is large in size, heavy in weight, has phase shift in inaccurate measurement, and uses a dynamic frequency range. Narrow and expensive issues.

To achieve the above object, the present invention adopts the following technical solutions: an AC power source power factor isolation detection interface circuit, including an AC voltage isolation detection circuit, an AC current isolation detection circuit, a voltage and current amplification circuit, and a power factor display interface circuit;

The voltage and current amplifying circuit includes dual integrated operational amplifier IC28, resistor R182, resistor R183, resistor R184, resistor R185, resistor R204, resistor R205, resistor R207, resistor R217, potentiometer RP30, potentiometer RP33, potentiometer RP36, Potentiometer RP37, polarity capacitor C137, polarity capacitor C148, the dual integrated operational amplifier IC28 adopts a dual voltage comparator LM393, the VCC end of the dual integrated operational amplifier IC28 is connected with a DC power supply, the resistance R182 The first end, the first end of the resistor R183, the first end of the resistor R184, and the first end of the resistor R185 are electrically connected to the VCC end of the dual integrated operational amplifier IC28 respectively, and the second end of the resistor R182 is connected to the polarity respectively. The positive end of the capacitor C137, the first end of the resistor R204, and the 1IN+ end of the dual integrated operational amplifier IC28 are electrically connected, the negative end of the capacitor C137 is electrically connected to the output end of the AC voltage isolation detection circuit, and the second end of the resistor R183 Terminals are electrically connected to the first terminal of resistor R205, the first terminal of potentiometer RP30, the adjustment terminal of potentiometer RP30, and the 1IN-terminal of dual integrated operational amplifier IC28, and the second terminal of said potentiometer RP30 is connected to the dual integrated operational amplifier The 1OUT end of the device IC28 is electrically connected, the second end of the resistor R205 is electrically connected to the first end of the potentiometer RP37, and the second end of the resistor R184 is respectively connected to the 2IN+ end of the dual integrated operational amplifier IC28, the polarity capacitor The positive end of C148 is electrically connected to the first end of resistor R217, the negative end of the polarity capacitor C148 is electrically connected to the output end of the AC current isolation detection circuit, and the second end of the resistor R185 is respectively connected to the dual integrated operational amplifier The 2IN-end of IC28, the first end of resistor R207, the first end of potentiometer RP33, and the adjustment end of potentiometer RP33 are electrically connected, and the 2OUT end of the dual integrated operational amplifier IC28 is electrically connected to the second end of potentiometer RP33 , the second end of the resistor R207 is electrically connected to the first end of the potentiometer RP36, the second end of the resistor R204, the second end of the resistor R217, the second end of the potentiometer RP37, the adjusting end of the potentiometer RP37, the potentiometer RP36 Both the second terminal and the adjustment terminal of the potentiometer RP36 are grounded;

The power factor display interface circuit includes a dual voltage comparator IC39, an exclusive OR gate chip IC41 at two input terminals, a resistor R228, a resistor R232, a resistor R233, a resistor R235, a resistor R236, a resistor R237, a resistor R241, a resistor R242, and a potentiometer RP45 , potentiometer RP46, described dual-voltage comparator IC39 adopts dual-voltage comparator LM393, and the VCC end of described dual-voltage comparator IC39 and the VDD end of two-input XOR gate chip IC41 are all connected with DC power supply, and described dual-voltage comparator IC39 The VCC end of the voltage comparator IC39 is electrically connected to the first end of the resistor R233, the first end of the resistor R235, the first end of the resistor R236, and the first end of the resistor R237, and the second end of the resistor R233 is respectively connected to the dual voltage comparator IC39. The 1IN-end of the resistor R241 is electrically connected to the first end of the resistor R241, the second end of the resistor R235 is electrically connected to the 2IN-end of the dual voltage comparator IC39, and the first end of the resistor R242, and the second end of the R236 is connected to the first end of the resistor R242 respectively. The 1OUT end of the dual voltage comparator IC39 and the A input end of the exclusive OR gate chip IC41 of the two input terminals are electrically connected, and the second end of the R237 is respectively connected with the 2OUT end of the dual voltage comparator IC39 and the exclusive OR gate chip IC41 of the two input terminals. The B input end is electrically connected, the first end of the resistor R232 is electrically connected to the 1OUT end of the dual integrated operational amplifier IC28, and the second end of the resistor R232 is respectively connected to the 1IN+ end of the dual voltage comparator IC39 and the potentiometer RP45 first end. One end is electrically connected, the first end of the resistor R228 is electrically connected to the 2OUT end of the dual integrated operational amplifier IC28, the second end of the resistor R228 is respectively connected to the 2IN+ end of the dual voltage comparator IC39, and the first end of the potentiometer RP46 Terminals are electrically connected, the second end of the resistor R241, the second end of the resistor R242, the second end of the potentiometer RP45, the adjustment end of the potentiometer RP45, the second end of the potentiometer RP46, the adjustment end of the potentiometer RP46, The GND end of the dual-voltage comparator IC39 and the GND end of the two-input XOR gate chip IC41 are grounded, and the XOR end of the two-input XOR gate chip IC41 is the output end of the power factor display interface circuit.

Further, the AC voltage isolation detection circuit includes a first step-down current limiting circuit, a first half-wave rectification filter circuit, a first precision voltage stabilization bias circuit, a first optocoupler isolation modulation circuit, a voltage sampling circuit, a first The DC blocking coupling capacitor, the output end of the first step-down current limiting circuit sequentially passes through the first half-wave rectification filter circuit, the first precision voltage stabilization bias circuit, the first optocoupler isolation modulation circuit and the polarity of the voltage and current amplification circuit The negative end of the capacitor C137 is electrically connected, and the voltage sampling circuit is electrically connected to the first optocoupler isolation modulation circuit through the first DC blocking coupling capacitor;

The AC current isolation detection circuit includes a second step-down current limiting circuit, a second half-wave rectification filter circuit, a second precision voltage stabilizing bias circuit, a second optocoupler isolation modulation circuit, and a second DC blocking coupling capacitor. The output end of the second step-down current limiting circuit is electrically connected to the negative end of the polarity capacitor C148 of the voltage and current amplifier circuit through the second half-wave rectification filter circuit, the second precision voltage stabilization bias circuit, and the second optocoupler isolation modulation circuit, The variable frequency power supply current sampling end is electrically connected to the second optocoupler isolation modulation circuit through the second DC blocking coupling capacitor.

Furthermore, the first optocoupler isolation modulation circuit includes a resistor R180, a resistor R192, a resistor R199, an optocoupler IC32, and a non-polar capacitor C132. The optocoupler IC32 uses an optocoupler PC817, and the optocoupler The anode terminal and the cathode terminal of the device IC32 are electrically connected to the first voltage stabilizing bias circuit through the resistor R192 and the resistor R199 respectively, and the emitter of the photocoupler IC32 is electrically connected to the polar capacitor C137 negative terminal of the voltage and current amplifying circuit, The collector of the optocoupler IC32 is electrically connected to a DC power supply through a resistor R180, and the collector of the optocoupler IC32 is grounded through a non-polar capacitor C132; the second optocoupler isolation modulation circuit includes a resistor R216, a resistor R223 , optocoupler IC37, non-polar capacitor C143, described optocoupler IC37 adopts optocoupler PC187, and the anode end and the cathode end of described optocoupler IC37 pass resistance R216 and resistance R223 and the second steady voltage bias respectively The circuit is electrically connected, the emitter of the optocoupler IC37 is electrically connected with the polar capacitor C148 negative terminal of the voltage and current amplifying circuit, the collector of the optocoupler IC37 is electrically connected with a DC power supply through a resistor R206, and the optocoupler The emitter of the device IC32 is also grounded through the non-polar capacitor C143.

By adopting the aforementioned technical scheme, the beneficial effects of the present invention are: the AC power source power factor isolation detection interface circuit has the advantages of small size, light weight, simple circuit structure, low cost, high waveform transmission accuracy, good linearity, and low temperature coefficient. Further, through the first optocoupler isolation circuit, the lossless and phase-shift transmission of the voltage isolation waveform is realized, and the AC current isolation detection circuit realizes the lossless and phase-shift transmission of the current isolation waveform through the second optocoupler isolation circuit. Wide frequency range for detecting AC power: low-frequency frequency is lower than 10Hz, high-frequency frequency is higher than 50kHz.

Description of drawings

Fig. 1 is the overall structural block diagram of the embodiment of the present invention;

Fig. 2 is the overall circuit schematic diagram of the embodiment of the present invention;

3 is a schematic diagram of an AC voltage isolation detection circuit according to an embodiment of the present invention;

Fig. 4 is a schematic diagram of an AC current isolation detection circuit according to an embodiment of the present invention.

detailed description

First of all, before describing the embodiments, it is necessary to explain some terms appearing in this text. The use of "first end" and "second end" herein to describe various elements is only used to distinguish the connection relationship between one element and another element, but these elements should not be limited by these terms.

The present invention will be further described in conjunction with the accompanying drawings and specific embodiments.

Referring to Fig. 1, Fig. 2, Fig. 3 and Fig. 4, this embodiment provides an AC power factor isolation detection interface circuit, including an AC voltage isolation detection circuit 1, an AC current isolation detection circuit 2, a voltage and current amplification circuit 3, and a power Factor display interface circuit 4, DC power supply 5, AC power supply voltage input terminal 6 and AC power supply current sampling terminal 7.

The AC voltage isolation detection circuit 1 includes a step-down current-limiting circuit 11 , a half-wave rectification filter circuit 12 , a precision voltage stabilization bias circuit 13 , an optocoupler isolation modulation circuit 14 , a voltage sampling circuit 15 , and a DC blocking coupling capacitor 16 . The step-down and current-limiting circuit 11 includes a resistor R190 and a resistor R197, the resistor R190 plays a role of step-down and current-limiting, and the resistor R197 plays a role of voltage limiting; the half-wave rectification filter circuit 12 includes a diode D36 and a polar capacitor C135, and the diode D36 It acts as a half-wave rectifier, and the polar capacitor C135 acts as a filter smoother; the precision voltage stabilizing bias circuit 13 includes a resistor R191, a potentiometer RP32, a polar capacitor C136, and a precision three-terminal voltage stabilizing block IC31. The setting circuit 13 provides a bias voltage for the optocoupler IC32, so that the optocoupler IC32 works in the linear region; the optocoupler isolation circuit 14 includes a resistor R180, a resistor R192, a resistor R199, an optocoupler IC32, and a non-polar capacitor C132 , the resistor R192 and the resistor R199 are isolation resistors, the resistor R180 and the non-polar capacitor C132 form a power supply decoupling circuit; the voltage sampling circuit 15 includes a resistor 178 and a resistor R179, and the DC blocking coupling capacitor 16 adopts a polar capacitor C131, The optocoupler IC32 adopts optocoupler PC817.

The specific circuit connection mode of the above AC voltage isolation detection circuit 1 is as follows: the first end of the resistor R178 and the first end of the resistor R190 are respectively electrically connected to the AC power supply voltage input end 6, and the second end of the resistor R178 is respectively connected to the resistor R179 The first end is electrically connected to the negative end of the polarity capacitor C131, the second end of the resistor R179 is grounded, the positive end of the polarity capacitor C131 is electrically connected to the anode end of the optocoupler IC32, and the second end of the resistor R190 terminals are respectively electrically connected to the first terminal of the resistor R197 and the positive terminal of the diode D36, the negative terminal of the diode D36 is respectively electrically connected to the first terminal of the resistor R191 and the positive terminal of the capacitor C135, and the second terminal of the resistor R191 is respectively connected to the positive terminal of the capacitor C135. The positive end of the linear capacitor C136, the output end of the precision three-terminal voltage regulator IC31, the first end of the potentiometer RP32, and the first end of the resistor R192 are electrically connected, and the second end of the resistor R192 is electrically connected to the anode end of the optocoupler IC32. The input end of the precision three-terminal voltage stabilizing block IC31 is electrically connected to the adjustment end of the potentiometer RP32, the first end of the resistor R199 is electrically connected to the cathode end of the optocoupler IC32, the second end of the resistor R197, the resistor R199 The second terminal, the third terminal of the potentiometer RP32, the negative terminal of the polar capacitor C135, the negative terminal of the polar capacitor C136, and the common terminal of the precision three-terminal voltage stabilizing block IC31 are all connected to the common terminal NO. The emitter is the output terminal of the AC detection voltage, the collector of the optocoupler IC32 is connected to the DC power supply 5 through the resistor R180, and the collector of the optocoupler IC32 is grounded through the capacitor C132.

The AC current isolation detection circuit 2 includes a step-down current-limiting circuit 21, a half-wave rectification filter circuit 22, a precision voltage stabilizing bias circuit 23, an optocoupler isolation modulation circuit 24, and a DC blocking coupling capacitor 25. The circuit 21 includes a resistor R214 and a resistor R219, the resistor R214 acts as a current limiter, and the resistor R219 acts as a step-down; the half-wave rectification filter circuit 22 includes a diode D41 and a polar capacitor C146, the diode D41 acts as a half-wave rectifier, and the polarity The capacitor C146 acts as a filter; the precision voltage stabilizing bias circuit 23 includes a resistor R215, a potentiometer RP39, a polar capacitor C147, and a precision three-terminal voltage stabilizing block IC36, which provides the optocoupler IC37 through the precise voltage stabilizing bias circuit 23 The bias voltage makes the optocoupler IC37 work in the linear region; the optocoupler isolation modulation circuit 24 includes resistor R206, resistor R216, resistor R223, optocoupler IC37, non-polar capacitor C143, resistor R216 and resistor R223 are isolated The resistor, resistor R206 and non-polar capacitor C143 form a power decoupling circuit; the DC blocking coupling capacitor 25 uses a polar capacitor C140, and the optocoupler IC32 uses an optocoupler PC817.

The specific circuit connection mode of the above-mentioned AC current isolation detection circuit 2 is as follows: the AC power supply current sampling terminal 7 is electrically connected to the anode of the optocoupler IC37 through the polar capacitor C140, and the first terminal of the resistor R214 is electrically connected to the AC power supply voltage input terminal 6. connected, the second end of the resistor R214 is electrically connected to the first end of the resistor R219 and the positive end of the diode D41 respectively, and the negative end of the diode D41 is electrically connected to the first end of the resistor R215 and the positive end of the polarity capacitor C146 respectively, The second end of the resistor R215 is electrically connected to the positive end of the polar capacitor C147, the output end of the precision three-terminal voltage regulator IC36, the first end of the potentiometer RP39, and the first end of the resistor R216. The second end of the resistor R216 It is electrically connected to the anode end of the optocoupler IC37, the input end of the precision three-terminal voltage stabilizing block IC36 is electrically connected to the adjustment end of the potentiometer RP39, the first end of the resistor R223 is electrically connected to the cathode end of the optocoupler IC37, The second terminal of the resistor R219, the second terminal of the resistor R223, the third terminal of the potentiometer RP39, the negative terminal of the polar capacitor C146, the negative terminal of the polar capacitor C147, and the common terminal of the precision three-terminal voltage stabilizing block IC36 are all connected to the common line terminal NO, the emitter of the optocoupler IC37 is an AC detection current output terminal, the collector of the optocoupler IC37 is connected to the DC power supply 5 through a resistor R206, and the collector of the optocoupler IC37 is also connected through a non-polar capacitor C143 is grounded.

The voltage and current amplifying circuit includes dual integrated operational amplifier IC28, resistor R182, resistor R183, resistor R184, resistor R185, resistor R204, resistor R205, resistor R207, resistor R217, potentiometer RP30, potentiometer RP33, potentiometer RP36, Potentiometer RP37, polarity capacitor C137, polarity capacitor C148, described dual integrated operational amplifier IC28 adopts dual integrated operational amplifier LM358, the VCC end of described dual integrated operational amplifier IC28 supplies power through DC power supply 5, and described resistance The first end of R182, the first end of resistor R183, the first end of resistor R184, and the first end of resistor R185 are electrically connected to the VCC end of the dual integrated operational amplifier IC28 respectively, and the second end of the resistor R182 is respectively connected to The positive end of the polarity capacitor C137, the first end of the resistor R204, and the 1IN+ end of the dual integrated operational amplifier IC28 are electrically connected, the negative end of the capacitor C137 is electrically connected to the emitter of the optocoupler IC32, and the resistor R183 The second end is electrically connected to the first end of the resistor R205, the first end of the potentiometer RP30, the adjustment end of the potentiometer RP30, and the 1IN-end of the dual integrated operational amplifier IC28, and the second end of the potentiometer RP30 is connected to the dual integrated The 1OUT end of the op-amp IC28 is electrically connected, the second end of the resistor R205 is electrically connected to the first end of the potentiometer RP37, and the second end of the resistor R184 is respectively connected to the 2IN+ end and pole of the dual integrated op-amp IC28. The positive end of the polarity capacitor C148 is electrically connected to the first end of the resistor R217, the negative end of the polarity capacitor C148 is electrically connected to the emitter of the optocoupler IC37, and the second end of the resistor R185 is respectively connected to the dual integrated operational amplifier The 2IN-end of the IC28, the first end of the resistor R207, the first end of the potentiometer RP33, and the adjustment end of the potentiometer RP33 are electrically connected, and the 2OUT end of the dual integrated operational amplifier IC28 is electrically connected to the second end of the potentiometer RP33 connection, the second end of the resistor R207 is electrically connected to the first end of the potentiometer RP36, the second end of the resistor R204, the second end of the resistor R217, the second end of the potentiometer RP37, the adjustment end of the potentiometer RP37, the potentiometer The second terminal of RP36 and the adjustment terminal of potentiometer RP36 are respectively grounded;

The power factor display interface circuit includes a dual voltage comparator IC39, an exclusive OR gate chip IC41 at two input terminals, a resistor R228, a resistor R232, a resistor R233, a resistor R235, a resistor R236, a resistor R237, a resistor R241, a resistor R242, and a potentiometer RP45, potentiometer RP46, described dual-voltage comparator IC39 adopts dual-voltage comparator LM393, the VCC end of described dual-voltage comparator IC39 and the VDD end of two-input XOR gate chip IC41 are all powered by DC power supply 5, so The VCC end of the dual-voltage comparator IC39 is electrically connected to the first end of the resistor R233, the first end of the resistor R235, the first end of the resistor R236, and the first end of the resistor R237, and the second end of the resistor R233 is compared with the dual voltage respectively. The 1IN-end of the IC39 and the first end of the resistor R241 are electrically connected, the second end of the resistor R235 is electrically connected with the 2IN-end of the dual voltage comparator IC39, and the first end of the resistor R242 respectively, and the second end of the R236 It is electrically connected with the 1OUT end of the dual voltage comparator IC39 and the A input end of the exclusive OR gate chip IC41 of the two input terminals respectively, and the second end of the R233 is respectively connected with the 2OUT end of the dual voltage comparator IC39 and the exclusive OR gate chip of the two input terminals The B input end of IC41 is electrically connected, the first end of the resistance R232 is electrically connected with the 1OUT end of the dual integrated operational amplifier IC28, and the second end of the resistance R232 is respectively connected with the 1IN+ end of the dual voltage comparator IC39, the potentiometer The first end of RP45 is electrically connected, the first end of the resistor R228 is electrically connected to the 2OUT end of the dual integrated operational amplifier IC28, and the second end of the resistor R228 is respectively connected to the 2IN+ end of the dual voltage comparator IC39 and the potentiometer RP46 The first end is electrically connected, the second end of the resistor R241, the second end of the resistor R242, the second end of the potentiometer RP45, the adjustment end of the potentiometer RP45, the second end of the potentiometer RP46, and the adjustment of the potentiometer RP46 terminal, the GND end of the dual-voltage comparator IC39, and the GND end of the two-input XOR gate chip IC41 are all grounded, and the XOR end of the two-input XOR gate chip IC41 is the output end of the power factor display interface circuit.

The invention adopts optocoupler isolation modulation technology to realize the isolation of linear detection problem and waveform lossless and phase-shift transmission, and has the advantages of small size, light weight, simple circuit structure, low cost, high waveform transmission precision, good linearity and low temperature coefficient. It is not only suitable for the test application of general commercial products (47~63Hz), but also can meet the application requirements of military, avionics and communication up to 400Hz. It is especially suitable for occasions where there are frequency conversion control equipment, high-power electromagnetic starters, and GPS high-frequency signal wireless transceivers on site. Widely used in electric power, remote monitoring, instrumentation, medical equipment, industrial automatic control and other industries that require AC power isolation to measure and control power factor.

The output terminals of the AC voltage isolation detection circuit 1 and the AC current isolation detection circuit 2 can also be connected to a voltage, current, and power display circuit 8 for isolating and detecting the voltage, current, and power of the AC power supply. The voltage, current, and power display circuit 8 includes a power meter Chip IC40, resistor R203, resistor R227, resistor R229, resistor R234, resistor R239, resistor R243, potentiometer RP42, potentiometer RP44, non-polar capacitor C151, non-polar capacitor C152, polar capacitor C153, non-polar capacitor C158, non-polar capacitor C159, polar capacitor C171, polar capacitor C172, the power metering chip IC40 uses a power metering chip HLW8012, the VDD pin of the power metering chip IC40 is connected to the +5V power supply through a resistor R229, the The VDD pin of the power metering chip IC40 is grounded through the capacitor C152, the polar capacitor C153 is connected in parallel with the non-polar capacitor C152, the V1P pin of the power metering chip IC40 is electrically connected with the positive electrode of the polar capacitor C172, and the power The V1P pin of the metering chip IC40 is also grounded respectively through the resistor R234 and the non-polar capacitor C158, and the negative pole of the polar capacitor C172 is electrically connected with the emitter of the optocoupler IC32 of the AC voltage isolation detection circuit 1 through the potentiometer RP44, so The negative pole of the polar capacitor C172 is also grounded through the resistor R239, the V1N pin of the power metering chip IC40 is grounded through the non-polar capacitor C159 and the resistor R243 respectively, and the V2P pin of the power metering chip IC40 is passed through the polar capacitor in turn. C171, potentiometer RP42 are electrically connected to the emitter of the optocoupler IC37 of the AC current isolation detection circuit 2, the V2P pin of the power metering chip IC40 is also grounded through the non-polar capacitor C151 and the resistor R227 respectively, and the power metering chip The GND pin of IC40 is grounded. The power metering chip IC40 can measure the output power, current and voltage square wave frequency value, the CF pin of the power metering chip IC40 outputs the square wave frequency value of active power, and the CF1 pin of the power metering chip IC40 outputs the current or voltage square wave frequency value , use the SEL pin selection of the power metering chip IC40, when the SEL pin is low, the square wave frequency value of the effective value of the CF1 pin output current, when the SEL pin is high, the CF1 pin output voltage RMS square wave frequency value.

Although the present invention has been particularly shown and described in conjunction with preferred embodiments, it will be understood by those skilled in the art that changes in form and details may be made to the present invention without departing from the spirit and scope of the invention as defined by the appended claims. Making various changes is within the 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.