CN2146716Y - Voltage-detecting AC digital instrument - Google Patents

Abstract

The utility model belongs to the implement and instrument field and a voltage detecting instrument in the present electronic equipment has the large system measuring error and can not visually read out the number because of adopting a pointing needle type instrument head. Therefore, the utility model provides a voltage detecting alternating current digital instrument having accurate number reading, strong vibration resistance, reliable operation and visual number reading and is composed of an isolator, a mutual locking option circuit, a divider, a signal carrying and putting conversion circuit, a rectified output circuit, a voltage changing rectified voltage stabilized power supply circuit, a negative voltage generator, an IC7107 integrated circuit and a displayer. The input end of the isolator is connected with a power supply and the voltage of the power supply goes to the signal carrying and putting conversion circuit through the divider to output the signal to the rectified output circuit after passing through the selective measurement of the mutual locking option circuit. Then the voltage of the power supply is inputted to the displayer through the treatment of the IC7107 integrated circuit.

Description

Voltage-detecting AC digital instrument

The utility model belongs to instrument field.

The voltage detecting instrument is widely used in the electronic equipment, is used to detect the numerical value and the variable quantity thereof of civil power, power piezoelectric voltage, with convenient monitoring to line voltage, power piezoelectric voltage, and the normal operation of equipment that assurance is electric.At present, the voltage detecting instrument that adopts is a pointer header, its principle of work is, utilize magnetomotive to drive the indicator action, and specify on the numeral of corresponding index dial, this numeral is promptly represented the numerical value of measured voltage, but because the skew at visual angle, tend to cause bigger reading error, and the indicator indicating positions is to change with the magnetic field of the earth is strong and weak, so the metering system error is bigger.In addition, the anti-vibration performance is poor, the phenomenon that often has the card pin accurately not indicate, and the variable quantity of voltage also is difficult for intuitively reading.

The purpose of this utility model is to propose a kind of accuracy of reading, and freedom from vibration is strong, reliable operation, and reading is voltage detecting ac digital instrument intuitively.

The utility model is by isolator 1, interlocking option switches circuit 2, divider 3, amplifier signaling conversion circuit 4, rectifying output circuit 5, transformation rectifying voltage regulator circuit 6, negative pressure generator 7, IC7107 integrated circuit 8, display 9 is formed, the input end of isolator 1 with connect power supply after the input end of transformation rectifying voltage regulator circuit 6 links to each other, the output terminal of the input termination isolator 1 of interlocking option switches circuit 2, the input end of its output termination divider 3, the output termination amplifier signaling conversion circuit 4 of divider 3, the output terminal while of transformation rectifying voltage regulator circuit 6 and the input end of negative pressure generator 7, the input end of amplifier change-over circuit 4 links to each other with the power input of IC7107 integrated circuit 8, the output terminal of the input termination amplifier change-over circuit 4 of rectifying output circuit 5, the power input of its output termination IC7107 integrated circuit 8, the power input of the output termination IC7107 integrated circuit 8 of negative pressure generator 7, the input end of the output termination display 9 of IC7107 integrated circuit 8.Principle of work: the effect of isolator 1 is that instrument and forceful electric power are isolated, the effect of interlocking option switches circuit 2 is to select to measure civil power 220V or power electricity 380V voltage, the IC7107 integrated circuit comprises large-scale integrated package 7107 and external tapping circuit thereof, and the IC7107 integrated circuit is finished signal transformation, mould/number conversion, counting, driven, shares out the work.Negative pressure generator 7 and IC7107 integrated circuit belong to prior art.After the energized, forceful electric power arrives interlocking option switches circuit 2 through isolator 1, after selecting to measure phase voltage, to divider 3, divider 3 output stationary signals are to amplifier signaling conversion circuit 4, amplifier signaling conversion circuit 4 output signals are to rectifying output circuit 5, simultaneously, forceful electric power is supplied with amplifier signaling conversion circuit 4, negative pressure generator 7 and IC7107 integrated circuit 8 through transformation rectifying voltage regulator circuit 6 output LOW voltages, negative pressure generator 7 and rectifying output circuit 5 output signals are input to display 9 to IC7107 integrated circuit 8 after signal Processing.

Advantage of the present utility model is that the metering system error is little, reading degree of accuracy height, and freedom from vibration is strong, does not have card pin phenomenon, and the variable quantity of read-out voltage directly perceived, and can realize measurement to civil power 220V or power electricity 380V in same gauge outfit.

Fig. 1 is the utility model schematic block circuit diagram

Fig. 2 is the utility model circuit theory diagrams

Embodiment:

The utility model is made up of isolator 1, interlocking option switches circuit 2, divider 3, amplifier signaling conversion circuit 4, rectifying output circuit 5, transformation rectifying voltage regulator circuit 6, negative pressure generator 7, IC7107 integrated circuit 8, display 9, and wherein isolator 1 is by resistance R ₄, R ₅, R ₆, R ₇Form, interlocking option switches circuit 2 is by K switch ₁, K ₂, K ₃Form, with the 380V power supply contact be A, B, C, ground wire is N, works as K switch ₁When being in open position, connecting C, N at 2 and can measure civil power 220V voltage, this also is of the present utility model one big characteristics, K switch ₁Point 2 ' with K ₂Point 2 link to each other K ₂Point 2 ' with K switch ₃Point 2 link to each other.Resistance R ₄Be connected in K switch ₁Point 2 and the C point between, resistance R ₅Be connected in K switch ₂Point 2 and the B point between, resistance R ₆Be connected in K switch ₃Point 2 and the A point between, resistance R ₇Be connected in K ₁, K ₂, K ₃Point 3 and the B point between, K switch ₁Point 2 and K ₃, the C point all connects the input E end of transformation rectifying voltage regulator circuit 6, the input F that N point connects transformation rectifying voltage regulator circuit 6 holds, voltage divider 3 is by variable resistor W ₁, resistance R ₁, R ₂, R ₃Form, amplifier signaling conversion circuit 4 is selected 3140 integrated package T for use ₁, T ₁Pin 1,4,5,8 unsettled, pin 7 is connected in the positive pole of transformation rectifying voltage regulator circuit 6 output terminals, variable resistor W ₁With resistance R ₁After the series connection, W ₁A termination K switch ₁, K ₂, K ₃Point 1, R ₁An end pass through resistance R ₂Meet T ₁Pin 3, R ₃An end be connected in R ₁With R ₂The junction, another termination K switch ₁, K ₂, K ₃Point 1 ', rectifying output circuit 5 is by resistance R ₈～R ₁₂, capacitor C ₁～C ₅, diode D ₁, D ₂Form resistance R ₈Be connected in T ₁Pin 2 and 6 between, capacitor C ₁One termination T ₁Pin 6, another termination two utmost point official D ₁Negative pole, capacitor C ₂A termination T ₁Pin 2, another termination capacitor C ₃With resistance R ₉End after the parallel connection, and capacitor C ₄With resistance R ₁₀End after the parallel connection, C ₄With R ₁₀Another terminating diode D after the parallel connection ₂Negative pole, D ₂Positive pole connect capacitor C ₁, resistance R ₁₁One termination IC7107 integrated circuit, 8 signal input part anodes, another terminating diode D ₂Negative pole, resistance R ₁₂One termination capacitor C ₂, the signal input part negative terminal of another termination IC7107 integrated circuit 8, capacitor C ₅Be connected between the positive and negative end of IC7107 integrated circuit 8 signal input parts K switch ₁, K ₂, K ₃Point 1 ', the input end negative terminal of the signal input part negative terminal of IC7107 integrated circuit 8 and power input negative terminal and negative pressure generator 7 all meets the defeated negative pole of transformation rectifying voltage regulator circuit 6 outputs, 3140 integrated package T ₁The power input anode of pin 7, IC7107 integrated circuit 8 and the input end anode of negative pressure generator 7 output head anode that all connects transformation rectifying voltage regulator circuit 6, the output termination IC7107 integrated circuit input end of negative pressure generator 7, the output termination display 9 of IC7107 integrated circuit 8, display 9 is selected light-emitting diode display for use.

Claims (2)

1, voltage detecting ac digital instrument, comprise transformation rectifying voltage regulator road 6, negative pressure generator 7, IC7017 integrated circuit 8, display 9, transformation rectifying voltage regulator circuit 6 input termination powers, output terminal output low-voltage dc voltage is supplied with negative pressure generator 7, amplifier signaling conversion circuit 4 and IC7107 integrated circuit 8, the signal input part of the output termination IC7107 integrated circuit 8 of negative pressure generator 7, the input end of the output termination display 9 of IC7107 integrated circuit 8, it is characterized in that also comprising isolator 1, the interlocking option, switch 2, divider 3, amplifier signaling conversion circuit 4, rectifying output circuit 5, the input termination power of isolator 1, the input end of output termination interlocking option switches 2, the output terminal of the input termination interlocking option switches circuit 2 of amplifier signaling conversion circuit 4, the input end of output termination rectifying output circuit 5, the signal input part of the output termination IC7107 integrated package 8 of rectifying output circuit 5.

2, according to the described voltage detecting ac digital of claim 1 instrument, it is characterized in that isolator 1 is by resistance R ₄～R ₇Form, interlocking option switches circuit 2 is by K switch ₁, K ₂, K ₃Form, divider 3 is by variable resistor W ₁, resistance R ₁～R ₃Form, amplifier signaling conversion circuit 4 is selected 3140 integrated package T for use ₁, rectifying output circuit 5 is by resistance R ₈～R ₁₂, capacitor C ₁～C ₅, diode D ₁, D ₂Form K switch ₁Point 2 ' with K switch ₂Point 2 link to each other K ₂Point 2 ' with K switch ₃Point 2 link to each other resistance R ₄Be connected in K ₁Point 2 and the C point between, resistance R ₅Be connected in K switch ₂Point 2 and the B point between, resistance R ₆Be connected in K ₃Point 2 and the A point between, resistance R ₇Be connected in K ₁, K ₂, K ₃Point 3 and the B point between, K ₁Point 2 and K ₃Point 2 ' link to each other K switch ₁, K ₂, K ₃Point 3, the input end E that the C point all connects transformation rectifying voltage regulator circuit 6, the pin 1,4,5,8 of 3140 integrated packages is unsettled, pin 7 is connected in the positive pole of transformation rectifying voltage regulator circuit 6 output terminals, variable resistor W ₁With resistance R ₁After the series connection, W ₁A termination K switch ₁, K ₂, K ₃Point 1, R ₁An end pass through resistance R ₂Meet T ₁Pin 3, R ₃An end be connected in R ₁And R ₂The junction, another termination K switch ₁, K ₂, K ₃Point 1 ', resistance R ₈Be connected in T ₁Pin 2 and 6 between, capacitor C ₁One termination T ₁Pin 6, another terminating diode D ₁Negative pole, capacitor C ₂A termination T ₁Pin 2, another termination capacitor C ₃With resistance R ₉An end and capacitor C after the parallel connection ₄With resistance R ₁₀End after the parallel connection, C ₄With R ₁₀Another terminating diode D after the parallel connection ₂Negative pole, D ₂Positive pole connect capacitor C ₁, resistance R ₁₁The signal input part anode of one termination IC7107 integrated circuit 8, another terminating diode D ₂Negative pole, resistance R ₁₂One termination capacitor C ₂, the signal input part negative terminal of another termination IC7107 integrated circuit 8, capacitor C ₅Be connected between the positive and negative end of IC7107 integrated circuit 8 signal input parts K switch ₁, K ₂, K ₃Point 1 ' link to each other 3140 integrated package T with transformation rectifying voltage regulator circuit 6 negative pole of output end ₁Pin 7 link to each other with the output head anode of transformation rectifying voltage regulator circuit 6.

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