CN203772944U - True effective value AC/DC voltage measuring device capable of automatically identifying type of signal - Google Patents
True effective value AC/DC voltage measuring device capable of automatically identifying type of signal Download PDFInfo
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- CN203772944U CN203772944U CN201420027336.2U CN201420027336U CN203772944U CN 203772944 U CN203772944 U CN 203772944U CN 201420027336 U CN201420027336 U CN 201420027336U CN 203772944 U CN203772944 U CN 203772944U
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Abstract
The utility model discloses a true effective value AC/DC voltage measuring device capable of automatically identifying types of signals. The device is characterized by comprising a voltage dividing buffer (1), a level translation circuit (2), an A/D converter (3), a zero-crossing synchronization circuit (4) and a microprocessor (5), wherein an output end of the voltage dividing buffer (1) is respectively connected with input ends of the level translation circuit (2) and the zero-crossing synchronization circuit (4), and an output end of the zero-crossing synchronization circuit (4) is connected to a synchronous detecting port of the microprocessor (5); a reference voltage output end of the A/D converter (3) is connected to a reference voltage input end of the level translation circuit (2), and an analog voltage input end of the A/D converter (3) is connected with an output end of the level translation circuit (2); and the microprocessor (5) is provided with a display interface and a communication interface, and an A/D converter interface of the microprocessor (5) is connected with a digital interface of the A/D converter (3). The true effective value AC/DC voltage measuring device can automatically identify alternating current, direct current and hybrid alternating current and direct current types, and can automatically measure AC voltage true effective value, DC voltage value and hybrid AC/DC voltage true effective value.
Description
Technical field
The utility model relates to a kind of ac and dc current signal measurement technique field, relates in particular to a kind of real effective alterating and direct current pressure measuring device.
Background technology
For the measurement of combined-voltage real effective, normally used method is: according to the difference of tested voltage type, tested voltage manual switchover to corresponding interchange or direct current input channel measured.In self-operated measuring unit, if the type of tested voltage is unknown, the intervention that artificial judgment is switched will directly reduce the automaticity of measurement mechanism.Meanwhile, if tested voltage is for mixing combined-voltage, it will be more loaded down with trivial details using the process of existing measurement mechanism, and be difficult to obtain comprehensive measurement parameter.
Summary of the invention
The purpose of this utility model is to solve above-mentioned shortcoming and a kind of automatic identification interchange, direct current, the mixing alternating current-direct current type that provide, automatically measures the real effective alterating and direct current pressure measuring device of the automatic identification signal type of AC Voltage TRMS, DC voltage value and mixing combined-voltage real effective.
The real effective alterating and direct current pressure measuring device of a kind of automatic identification signal type of the present utility model, comprise dividing potential drop and impact damper, level translation circuit, A/D converter, zero passage synchronizing circuit and microprocessor, the output terminal of dividing potential drop and impact damper is connected with the input end of level translation circuit and zero passage synchronizing circuit respectively, and the output of zero passage synchronizing circuit is connected on the synchronous detection mouth of microprocessor; The reference voltage output terminal of A/D converter is received on the reference voltage input terminal of level translation circuit, and the analog voltage input of A/D converter is connected with the output of level translation circuit; Microprocessor is provided with display interface and communication interface, the A/D converter interface of microprocessor and the interconnection of the digital interface of A/D converter.
The real effective alterating and direct current pressure measuring device of above-mentioned automatic identification signal type, wherein: the resistance R 5 of dividing potential drop and impact damper is connected between input interface J1 and the normal phase input end of operational amplifier U1, resistance R 7 is in parallel with capacitor C 1, resistance R 7 is connected between the negative-phase input of operational amplifier U1 and the output terminal of operational amplifier U1, resistance R 6 be connected in the normal phase input end of operational amplifier U1 and publicly between;
Level translation circuit comprises level translation integrated circuit U3, reference voltage source impact damper U2 and voltage clamping circuit R12, D1, D2, the differential operational amplifier U3A of level translation integrated circuit U3 inner member and resistance R 1, resistance R 2, resistance R 3, resistance R 4.Resistance R 1 and R2 series connection, it connects common port and is connected with the positive input terminal of differential operational amplifier U3A, the other end of resistance R 1 is connected with the REF of U3 end, then receives on the output terminal of dividing potential drop and impact damper 1, and the other end of resistance R 2 is connected with the reference voltage input terminal of U3, then receives on the output terminal of reference voltage source impact damper U2, resistance R 3 and R4 series connection, it connects common port and is connected with the negative input end of U3A, the other end of resistance R 3 and level translation integrated circuit U3-IN holds and is connected, then receive publicly, the other end of resistance R 4 is connected with OUT end with the SENCE end of level translation integrated circuit U3, then receives in the resistance R 12 of voltage clamping circuit, level translation integrated circuit U3-IN termination is publicly, the SENSE end of level translation integrated circuit U3 is connected with the OUT end of level translation integrated circuit U3, the REF end of level translation integrated circuit U3 is connected with the output terminal of operational amplifier U1, the reference voltage input terminal of level translation integrated circuit U3 is connected with the output terminal of reference voltage source impact damper U2, the negative-phase input of reference voltage source impact damper U2 is connected with the output terminal of reference voltage source impact damper U2, capacitor C 4 be connected in the input end of reference voltage source impact damper U2 and publicly between, the input end of reference voltage source impact damper U2 is connected with the reference voltage of A/D converter 3 output Uref end, resistance R 12 is connected between the OUT end and the A/D input end of A/D converter 3 of level translation integrated circuit U3, the anode of diode D1 connects publicly, the negative electrode of diode D1 is connected with the A/D input end of A/D converter 3, the negative electrode of diode D2 meets positive supply+V
cC, the anode of diode D2 is connected with the A/D input end of A/D converter 3, capacitor C 3 be connected in the A/D input end of A/D converter 3 and publicly between,
Resistance R 1 is connected between the REF end and the normal phase input end of differential operational amplifier U3A of level translation integrated circuit U3, resistance R 2 is connected between the reference voltage input terminal and the normal phase input end of differential operational amplifier U3A of level translation integrated circuit U3, resistance R 3 is connected in level translation integrated circuit U3's-IN end and the negative-phase input of differential operational amplifier U3A between, resistance R 4 is connected between the SENSE end and the negative-phase input of differential operational amplifier U3A of level translation integrated circuit U3, the OUT end of level translation integrated circuit U3 is connected with the output terminal of differential operational amplifier U3A,
The capacitor C 2 of zero passage synchronizing circuit is connected between the output terminal of operational amplifier U1 and the negative-phase input of voltage comparator U4, resistance R 8 is connected between the normal phase input end of voltage comparator U4 and the negative-phase input of voltage comparator U4, and resistance R 11 is connected in output terminal and the positive supply+V of voltage comparator U4
cCbetween, resistance R 9 is connected in normal phase input end and the positive supply+V of voltage comparator U4
cCbetween, resistance R 10 be connected in the normal phase input end of voltage comparator U4 and publicly between;
The synchronous detection mouthful of microprocessor is connected with the output terminal of voltage comparator U4, and the A/D converter interface of microprocessor is connected with the digital interface of A/D converter;
The reference voltage source impact damper U2 positive input terminal of level translation integrated circuit is connected to the reference voltage output terminal Uref of A/D converter, and negative input end is connected with output terminal and is connected to the reference voltage input terminal of level translation integrated circuit; Reference voltage source impact damper U2 output voltage is U
u2o=U
ref, filter capacitor C4 is parallel between U2 positive input terminal and ground; The A/D converter interface of microprocessor 5 and the interconnection of the digital interface of A/D converter.
The real effective alterating and direct current pressure measuring device of above-mentioned automatic identification signal type, wherein: if the A/D converter of selecting is without built-in reference voltage source, by increasing the mode of external reference voltage source U7, solve, the power voltage terminal VIN of reference voltage source U7 is connected with power source voltage Vcc; Reference voltage source U7 earth terminal GND be connected publicly; Reference voltage source output terminal VOUT is connected with the reference voltage input terminal Uref of A/D converter and the positive input terminal of reference voltage source impact damper U2.
The utility model compared with prior art, has obvious advantage and effect, known by above technical scheme: input dividing potential drop and impact damper, level translation circuit, zero passage synchronizing circuit, A/D change-over circuit and microprocessor etc., consist of.Tested alternating current-direct current signal is first through bleeder circuit step-down, then through buffer amplifier output, is added to respectively on level translation circuit and zero passage synchronizing circuit.Level translation circuit, being raised to by null value with reference to zero level on the point midway of A/D converter input range, is measured the initial conditions of interchange and positive-negative polarity direct current to meet the ordinary single power supply A/D converter of a large amount of uses.The output of level translation circuit connects clamp circuit and RC wave filter, prevents that superpotential and high frequency noise from entering A/D converter.The reference voltage base of level translation circuit is taken from A/D converter internal reference or external benchmark, through capacitor filtering and buffer buffers and obtain.Four resistances that reference voltage base value and level translation circuit differential amplifier connect determine the size of level lifting value jointly.A/D converter digital interface is connected with microprocessor A/D converter interface.Zero passage synchronizing circuit is for detecting the zero crossing that exchanges or mix the AC compounent of alternating current-direct current.It is comprised of voltage comparator, input capacitance, the default divider resistance of reference voltage, micro-biasing resistor and output pull-up resistor.Zero-crossing pulse output is connected to microprocessor and synchronously detects mouth.Microprocessor is by the synchronous mouthful detection zero passage synchronizing pulse that detects.According to the feature of zero passage synchronizing pulse, by A/D converter digital interface, A/D converter is operated.Gather tested instantaneous voltage, and image data is carried out to respective handling.By microprocessor display interface and communication interface, final measurement is sent.This simple circuit, reliable, realization with low cost.Without blocked operation manually, just can realize all automatic measurement to interchange, direct current, mixing alternating current-direct current, improved automaticity and the efficiency of measuring process.Can be applicable in surveying instrument, equipment or measuring system.Owing to adopting microprocessor software real effective computing method and automatic frequency tracking simultaneous techniques, therefore the AC compounent of measured interchange or mixing alternating current-direct current can be the wider random waveform of frequency range.
Accompanying drawing explanation
Fig. 1 is schematic block circuit diagram of the present utility model.
Fig. 2 is the circuit theory diagrams of embodiment 1.
Fig. 3 is the circuit theory diagrams of embodiment 2.
Mark in figure:
1: dividing potential drop and impact damper; 2: level translation circuit; 3:A/D converter; 4: zero passage synchronizing circuit; 5: microprocessor.
R5, R6, R7, R8, R9, R10, R11, R12: resistance
C1, C2, C3, C4: electric capacity
U1: operational amplifier
U2: reference voltage source impact damper
U3: level translation integrated circuit
U4: voltage comparator
J1: input interface
+ V
cC: positive supply
R1, R2, R3, R4: the resistance of level translation integrated circuit 2 inside
U3A: the differential operational amplifier of level translation integrated circuit 2 inside
U7: reference voltage source.
Embodiment
embodiment 1:
Referring to Fig. 1, the real effective alterating and direct current pressure measuring device of automatic identification signal type, comprise dividing potential drop and impact damper 1, level translation circuit 2, A/D converter 3, zero passage synchronizing circuit 4 and microprocessor 5, the output terminal of dividing potential drop and impact damper 1 is connected with the input end of level translation circuit 2 and zero passage synchronizing circuit 4 respectively, and 4 outputs of zero passage synchronizing circuit are connected on the synchronous detection mouth of microprocessor 5; The reference voltage output terminal of A/D converter 3 is received on the reference voltage input terminal of level translation circuit 2, and the analog input end of A/D converter 3 is connected with the output of level translation circuit 2; Microprocessor 5 is provided with display interface and communication interface, the A/D converter interface of microprocessor 5 and the interconnection of the digital interface of A/D converter 3.
Referring to Fig. 2, wherein: the resistance R 5 of dividing potential drop and impact damper 1 is connected between input interface J1 and the normal phase input end of operational amplifier U1, resistance R 7 is in parallel with capacitor C 1, resistance R 7 is connected between the negative-phase input of operational amplifier U1 and the output terminal of operational amplifier U1, resistance R 6 be connected in the normal phase input end of operational amplifier U1 and publicly between;
Level translation circuit 2 comprises level translation integrated circuit U3, reference voltage source impact damper U2 and voltage clamping circuit R12, D1, D2, the differential operational amplifier U3A of level translation integrated circuit U3 inner member and resistance R 1, resistance R 2, resistance R 3, resistance R 4.Resistance R 1 and R2 series connection, it connects common port and is connected with the positive input terminal of differential operational amplifier U3A, the other end of resistance R 1 is connected with the REF of U3 end, then receives on the output terminal of dividing potential drop and impact damper 1, and the other end of resistance R 2 is connected with the reference voltage input terminal of U3, then receives on the output terminal of reference voltage source impact damper U2, resistance R 3 and R4 series connection, it connects common port and is connected with the negative input end of U3A, the other end of resistance R 3 and level translation integrated circuit U3-IN holds and is connected, then receive publicly, the other end of resistance R 4 is connected with OUT end with the SENCE end of level translation integrated circuit U3, then receives in the resistance R 12 of voltage clamping circuit, level translation integrated circuit U3-IN termination is publicly, the SENSE end of level translation integrated circuit U3 is connected with the OUT end of level translation integrated circuit U3, the REF end of level translation integrated circuit U3 is connected with the output terminal of operational amplifier U1, the reference voltage input terminal of level translation integrated circuit U3 is connected with the output terminal of reference voltage source impact damper U2, the negative-phase input of reference voltage source impact damper U2 is connected with the output terminal of reference voltage source impact damper U2, capacitor C 4 be connected in the input end of reference voltage source impact damper U2 and publicly between, the input end of reference voltage source impact damper U2 is connected with the reference voltage of A/D converter 3 output Uref end, resistance R 12 is connected between the OUT end and the A/D input end of A/D converter 3 of level translation integrated circuit U3, the anode of diode D1 connects publicly, the negative electrode of diode D1 is connected with the A/D input end of A/D converter 3, the negative electrode of diode D2 meets positive supply+V
cC, the anode of diode D2 is connected with the A/D input end of A/D converter 3, capacitor C 3 be connected in the A/D input end of A/D converter 3 and publicly between,
Resistance R 1 is connected between the REF end and the normal phase input end of differential operational amplifier U3A of level translation integrated circuit U3, resistance R 2 is connected between the reference voltage input terminal and the normal phase input end of differential operational amplifier U3A of level translation integrated circuit U3, resistance R 3 is connected in level translation integrated circuit U3's-IN end and the negative-phase input of differential operational amplifier U3A between, resistance R 4 is connected between the SENSE end and the negative-phase input of differential operational amplifier U3A of level translation integrated circuit U3, the OUT end of level translation integrated circuit U3 is connected with the output terminal of differential operational amplifier U3A,
The capacitor C 2 of zero passage synchronizing circuit 4 is connected between the output terminal of operational amplifier U1 and the negative-phase input of voltage comparator U4, resistance R 8 is connected between the normal phase input end of voltage comparator U4 and the negative-phase input of voltage comparator U4, and resistance R 11 is connected in output terminal and the positive supply+V of voltage comparator U4
cCbetween, resistance R 9 is connected in normal phase input end and the positive supply+V of voltage comparator U4
cCbetween, resistance R 10 be connected in the normal phase input end of voltage comparator U4 and publicly between;
The synchronous detection mouthful of microprocessor 5 is connected with the output terminal of voltage comparator U4, and the A/D converter interface of microprocessor 5 is connected with the digital interface of A/D converter 3;
The reference voltage source impact damper U2 positive input terminal of level translation integrated circuit 2 is connected to the reference voltage output terminal Uref of A/D converter 3, and negative input end is connected with output terminal and is connected to the reference voltage input terminal of level translation integrated circuit 2; Reference voltage source impact damper U2 output voltage is U
u2o=U
ref, filter capacitor C4 is parallel between reference voltage source impact damper U2 positive input terminal and ground; The A/D converter interface of microprocessor 5 and the interconnection of the digital interface of A/D converter 3.
Principle of work: tested alternating current-direct current signal is added on the input end of input dividing potential drop and impact damper 1, through bleeder circuit step-down and impact damper impedance transformation, the Low ESR signal that output meets subsequent conditioning circuit amplitude requirement is to level translation circuit 2 and zero passage synchronizing circuit 4; Level translation circuit 2 is being raised to by null value with reference to zero level on the point midway of A/D converter 3 input ranges, to meet the requirement of the single supply A/D converter generally using at present; The analog input end of A/D converter 3 is connected with the output of level translation circuit 2; Reference voltage output is received on the reference voltage input terminal of level translation circuit 2, and digital interface is connected with the A/D converter interface of microprocessor 5; Zero passage synchronizing circuit 4 is for detection of the zero crossing that exchanges or mix the AC compounent of alternating current-direct current, and its output is connected on the synchronous detection mouth of microprocessor 5; Microprocessor 5 detects the synchronizing pulse of zero passage synchronizing circuit 4 outputs by built-in measurement control software; And A/D converter 3 is operated, gather instantaneous voltage; Judge by analysis and data processing, measurement result is sent by display interface and communication interface.
Input dividing potential drop and impact damper 1 are comprised of input interface J1, resistance R 5, R6, R7, capacitor C 1 and operational amplifier U1, and tested alternating current-direct current signal is added on the input interface J1 of input minute compression buffer 1;
Voltage divider comprises the resistance R 5 that is connected in input interface J1 and operational amplifier U1 positive input terminal; Be connected in the positive input terminal of operational amplifier U1 and the resistance R of common 6, voltage divider intrinsic standoff ratio is R6/ (R5+R6), and intrinsic standoff ratio is determined the requirement of operational amplifier U1 input range according to measurement range and A/D converter;
R7 and C1 are parallel between operational amplifier U1 negative input end and output terminal, form low pass buffer amplifier with operational amplifier U1; Low pass buffer amplifier has the impedance transformation effect of high resistant input, low-resistance output, and can disturb by the outer high-frequency signal of inhibition zone.In its passband, gain is 1, and-3dB frequency is:
;
Operational amplifier U1 output, as the output of minute compression buffer 1, is connected to respectively level translation circuit 2 and zero passage synchronizing circuit 4;
Reference voltage source impact damper U2 is used high impedance input operational amplifier, and its positive input terminal is connected to the reference voltage output terminal Uref of A/D converter 3, and negative input end is connected with output terminal and is connected to the reference voltage input terminal of level translation integrated circuit 2; Reference voltage source impact damper U2 output voltage is U
u2o=U
ref, filter capacitor C4 is parallel between reference voltage source impact damper U2 positive input terminal and ground;
In level translation integrated circuit U3, R3=2R4, R2=2R1, calculate level translation integrated circuit U3 output voltage and be:
.So just realized the lifting of input combined-voltage, datum point is Uref/2.For meeting the input requirements of follow-up A/D converter: 0～Uref, the upper input voltage range of input interface J1 is:
;
Voltage clamping circuit comprises one end and the resistance R 12 that level translation integrated circuit U3 output OUT is connected, the other end is connected with the A/D input end of A/D converter 3; The diode D1 that plus earth, negative electrode are connected with the A/D input end of A/D converter 3; Negative electrode meets the diode D2 that positive supply, anode are connected with the A/D input end of A/D converter 3.When the upper input voltage of input interface J1 surpasses range and makes level translation integrated circuit U3 output voltage lower than 0V or higher than power supply positive voltage, D1 or D2 conducting, voltage clamping circuit action, prevents that A/D converter 3 from damaging.D1, D2 are used schottky diode.Capacitor C 3 is parallel between the A/D input end and ground of A/D converter 3, forms single order RC wave filter disturb with the outer high-frequency signal of further inhibition zone with R12.
Zero passage synchronizing circuit 4 is comprised of voltage comparator U4, capacitor C 2 and resistance R 8, R9, R10, R11, in zero passage synchronizing circuit 4, C2 is input coupling capacitance, its one end is connected with the output terminal of dividing potential drop and impact damper 1, and the other end is connected with the negative input end of voltage comparator U4.After resistance R 9 and R10 series connection, be connected between positive supply and ground, it connects common port and is connected with the positive input terminal of voltage comparator U4, and for voltage comparator, U4 provides comparison reference voltage:
; Resistance R 11, for output pull-up resistor, is parallel between voltage comparator U4 output terminal and positive supply.Micro-biasing resistor R8 is parallel between the positive and negative input end of voltage comparator U4.Voltage comparator U4 adopts the LinCMOS device of utmost point Low-bias Current.Because of the input bias current extremely low (representative value is 5pA) of voltage comparator U4, the electric current that therefore flows through R8 is also minimum.In the situation that zero passage synchronizing circuit 4 is inputted without interchange, voltage comparator U4 negative input end voltage is less than positive input terminal voltage slightly, and now voltage comparator U4 is output as high level.During due to static state, the positive and negative input terminal voltage difference of voltage comparator U4 is very little, and the resistance value of R8 is larger, so zero passage synchronizing circuit 4 has very high sensitivity.Survey this circuit and can accurately detect the sinusoidal wave zero crossing that amplitude is 1mVrms;
4 outputs of zero passage synchronizing circuit are connected to the synchronous detection mouthful of microprocessor 5;
A/D converter 3 is used high speed successive approximation A/D converter, for combined-voltage signal is converted to corresponding digital signal; A/D input end is connected with the output terminal of level translation circuit 2, and reference voltage output terminal is connected with the reference voltage source impact damper U2 input end in level translation circuit 2; A/D converter 3 is connected with the A/D converter interface of microprocessor by digital interface.According to concrete model and the interface type of the A/D converter 3 of selecting, this digital interface can be one of various ways such as SPI, I2C, parallel port;
The built-in measurement control software of microprocessor 5, detects zero-crossing pulse by synchronous detection mouthful; According to testing result, by A/D converter interface, A/D converter 3 is operated, with specific cycle and the time interval, gather instantaneous voltage value.Judge by analysis and data processing, measurement result is sent by display interface and communication interface.
embodiment 2:
Referring to Fig. 1,3, the real effective alterating and direct current pressure measuring device of automatic identification signal type, comprise dividing potential drop and impact damper 1, level translation circuit 2, A/D converter 3, zero passage synchronizing circuit 4 and microprocessor 5, the output terminal of dividing potential drop and impact damper 1 is connected with the input end of level translation circuit 2 and zero passage synchronizing circuit 4 respectively, and 4 outputs of zero passage synchronizing circuit are connected on the synchronous detection mouth of microprocessor 5; The reference voltage output terminal of A/D converter 3 is received on the reference voltage input terminal of level translation circuit 2, and the analog input end of A/D converter 3 is connected with the output of level translation circuit 2; Microprocessor 5 is provided with display interface and communication interface, the A/D converter interface of microprocessor 5 and the interconnection of the digital interface of A/D converter 3;
Power voltage terminal VIN and the positive supply+V of reference voltage source U7
cCbe connected, reference voltage source U7 meets common GND and is connected publicly; The output terminal VOUT of reference voltage source U7 is connected with the normal phase input end of the reference voltage of A/D converter 3 input VREF end and reference voltage source impact damper U2, and all the other are with embodiment 1.
Principle of work: if the A/D converter of selecting, without built-in reference voltage source, solves by increasing the mode of external reference voltage source U7, the power voltage terminal VIN of U7 is connected with power source voltage Vcc; Earth terminal GND be connected publicly; Output terminal VOUT is connected with the reference voltage input terminal VREF of A/D converter 3 and the positive input terminal of reference voltage source impact damper U2; All the other are with embodiment 1.
In the utility model circuit, also comprise power supply circuit and the filtering circuit relevant with power supply, wherein, operational amplifier U1, reference voltage source impact damper U2, level translation integrated circuit U3, voltage comparator U4 adopt positive-negative power supply, A/D converter 3, microprocessor 5 adopt single supply (positive supply) power supply, and the formation of filtering circuit and parameter design according to the specific requirement of integrated circuit used.
In the utility model circuit, also comprise the overcurrent-overvoltage protecting circuit of importation.
The input alternating current-direct current signal that the utility model is described is voltage, but is not limited only to voltage, increases the automatic measurement that current-voltage conversion can realize ac and dc current signal before input circuit.
In the utility model, A/D converter circuit 3 and microprocessor 5 are two ingredients of hardware circuit, but A/D converter circuit 3 also can be included in the microprocessor with high-speed a/d converter, that is: with the microprocessor of built-in high-speed a/d converter, replace A/D converter circuit 3 and microprocessor 5 two parts circuit.
The above, it is only preferred embodiment of the present utility model, not the utility model is done to any pro forma restriction, any technical solutions of the utility model content that do not depart from, any simple modification, equivalent variations and the modification above embodiment done according to technical spirit of the present utility model, all still belong in the scope of technical solutions of the utility model.
Claims (3)
1. the real effective alterating and direct current pressure measuring device of an automatic identification signal type, it is characterized in that: comprise dividing potential drop and impact damper (1), level translation circuit (2), A/D converter (3), zero passage synchronizing circuit (4) and microprocessor (5), the output terminal of dividing potential drop and impact damper (1) is connected with the input end of level translation circuit (2) and zero passage synchronizing circuit (4) respectively, and zero passage synchronizing circuit (4) output is connected on the synchronous detection mouth of microprocessor (5); The reference voltage output terminal of A/D converter (3) is received on the reference voltage input terminal of level translation circuit (2), and the analog voltage input of A/D converter (3) is connected with the output of level translation circuit (2); Microprocessor (5) is provided with display interface and communication interface, the digital interface interconnection of the A/D converter interface of microprocessor (5) and A/D converter (3).
2. the real effective alterating and direct current pressure measuring device of automatic identification signal type as claimed in claim 1, it is characterized in that: the resistance R 5 of dividing potential drop and impact damper (1) is connected between input interface J1 and the normal phase input end of operational amplifier U1, resistance R 7 is in parallel with capacitor C 1, resistance R 7 is connected between the negative-phase input of operational amplifier U1 and the output terminal of operational amplifier U1, resistance R 6 be connected in the normal phase input end of operational amplifier U1 and publicly between;
Level translation circuit comprises level translation integrated circuit U3, reference voltage source impact damper U2 and voltage clamping circuit R12, D1, D2, the differential operational amplifier U3A of level translation integrated circuit U3 inner member and resistance R 1, resistance R 2, resistance R 3, resistance R 4, resistance R 1 and R2 series connection, it connects common port and is connected with the positive input terminal of differential operational amplifier U3A, the other end of resistance R 1 is connected with the REF of U3 end, then receives on the output terminal of dividing potential drop and impact damper 1, and the other end of resistance R 2 is connected with the reference voltage input terminal of U3, then receives on the output terminal of reference voltage source impact damper U2, resistance R 3 and R4 series connection, it connects common port and is connected with the negative input end of U3A, the other end of resistance R 3 and level translation integrated circuit U3-IN holds and is connected, then receive publicly, the other end of resistance R 4 is connected with OUT end with the SENCE end of level translation integrated circuit U3, then receives in the resistance R 12 of voltage clamping circuit, level translation integrated circuit U3-IN termination is publicly, the SENSE end of level translation integrated circuit U3 is connected with the OUT end of level translation integrated circuit U3, the REF end of level translation integrated circuit U3 is connected with the output terminal of operational amplifier U1, the reference voltage input terminal of level translation integrated circuit U3 is connected with the output terminal of reference voltage source impact damper U2, the negative-phase input of reference voltage source impact damper U2 is connected with the output terminal of reference voltage source impact damper U2, capacitor C 4 be connected in the input end of reference voltage source impact damper U2 and publicly between, the input end of reference voltage source impact damper U2 is connected with the reference voltage of A/D converter 3 output Uref end, resistance R 12 is connected between the OUT end and the A/D input end of A/D converter 3 of level translation integrated circuit U3, the anode of diode D1 connects publicly, the negative electrode of diode D1 is connected with the A/D input end of A/D converter 3, the negative electrode of diode D2 meets positive supply+V
cC, the anode of diode D2 is connected with the A/D input end of A/D converter 3, capacitor C 3 be connected in the A/D input end of A/D converter 3 and publicly between,
Resistance R 1 is connected between the REF end and the normal phase input end of differential operational amplifier U3A of level translation integrated circuit U3, resistance R 2 is connected between the reference voltage input terminal and the normal phase input end of differential operational amplifier U3A of level translation integrated circuit U3, resistance R 3 is connected in level translation integrated circuit U3's-IN end and the negative-phase input of differential operational amplifier U3A between, resistance R 4 is connected between the SENSE end and the negative-phase input of differential operational amplifier U3A of level translation integrated circuit U3, the OUT end of level translation integrated circuit U3 is connected with the output terminal of differential operational amplifier U3A,
The capacitor C 2 of zero passage synchronizing circuit (4) is connected between the output terminal of operational amplifier U1 and the negative-phase input of voltage comparator U4, resistance R 8 is connected between the normal phase input end of voltage comparator U4 and the negative-phase input of voltage comparator U4, and resistance R 11 is connected in output terminal and the positive supply+V of voltage comparator U4
cCbetween, resistance R 9 is connected in normal phase input end and the positive supply+V of voltage comparator U4
cCbetween, resistance R 10 be connected in the normal phase input end of voltage comparator U4 and publicly between;
The synchronous detection mouthful of microprocessor (5) is connected with the output terminal of voltage comparator U4, and the A/D converter interface of microprocessor (5) is connected with the digital interface of A/D converter (3);
The reference voltage source impact damper U2 positive input terminal of level translation integrated circuit (2) is connected to the reference voltage output terminal Uref of A/D converter (3), and negative input end is connected with output terminal and is connected to the reference voltage input terminal of level translation integrated circuit (2); Reference voltage source impact damper U2 output voltage is U
u2o=U
ref, filter capacitor C4 is parallel between U2 positive input terminal and ground; The digital interface interconnection of the A/D converter interface of microprocessor (5) and A/D converter (3).
3. the real effective alterating and direct current pressure measuring device of automatic identification signal type as claimed in claim 1 or 2, wherein: the power voltage terminal VIN of reference voltage source U7 is connected with power source voltage Vcc; Reference voltage source U7 earth terminal GND be connected publicly; Reference voltage source output terminal VOUT is connected with the reference voltage input terminal Uref of A/D converter (3) and the positive input terminal of reference voltage source impact damper U2.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420027336.2U CN203772944U (en) | 2014-01-16 | 2014-01-16 | True effective value AC/DC voltage measuring device capable of automatically identifying type of signal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420027336.2U CN203772944U (en) | 2014-01-16 | 2014-01-16 | True effective value AC/DC voltage measuring device capable of automatically identifying type of signal |
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| Publication Number | Publication Date |
|---|---|
| CN203772944U true CN203772944U (en) | 2014-08-13 |
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|---|---|---|---|
| CN201420027336.2U Expired - Lifetime CN203772944U (en) | 2014-01-16 | 2014-01-16 | True effective value AC/DC voltage measuring device capable of automatically identifying type of signal |
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| CN (1) | CN203772944U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104515898A (en) * | 2014-11-13 | 2015-04-15 | 浙江涵普电力科技有限公司 | Alternating current and direct current universal real-available-value voltage transmitter |
| CN105004903A (en) * | 2015-07-13 | 2015-10-28 | 江苏省电力公司淮安供电公司 | High-internal-resistance alternating current-direct current universal voltmeter |
| CN106532923A (en) * | 2017-01-06 | 2017-03-22 | 常熟开关制造有限公司(原常熟开关厂） | Control method and apparatus for alternating current and direct current universal type power supply conversion switch |
| CN106772123A (en) * | 2017-01-06 | 2017-05-31 | 常熟开关制造有限公司(原常熟开关厂） | Power supply type recognition methods, circuit and automatic change-over |
| RU211214U1 (en) * | 2022-03-22 | 2022-05-25 | Евгений Борисович Колесников | AC/DC VOLTAGE MEASURING CONVERTER |
-
2014
- 2014-01-16 CN CN201420027336.2U patent/CN203772944U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104515898A (en) * | 2014-11-13 | 2015-04-15 | 浙江涵普电力科技有限公司 | Alternating current and direct current universal real-available-value voltage transmitter |
| CN105004903A (en) * | 2015-07-13 | 2015-10-28 | 江苏省电力公司淮安供电公司 | High-internal-resistance alternating current-direct current universal voltmeter |
| CN106532923A (en) * | 2017-01-06 | 2017-03-22 | 常熟开关制造有限公司(原常熟开关厂） | Control method and apparatus for alternating current and direct current universal type power supply conversion switch |
| CN106772123A (en) * | 2017-01-06 | 2017-05-31 | 常熟开关制造有限公司(原常熟开关厂） | Power supply type recognition methods, circuit and automatic change-over |
| CN106532923B (en) * | 2017-01-06 | 2019-10-29 | 常熟开关制造有限公司(原常熟开关厂） | The control method and device of AC/DC universal type transfer switch |
| RU211214U1 (en) * | 2022-03-22 | 2022-05-25 | Евгений Борисович Колесников | AC/DC VOLTAGE MEASURING CONVERTER |
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