CN104897955A - Intelligent current voltmeter - Google Patents

Intelligent current voltmeter Download PDF

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Publication number
CN104897955A
CN104897955A CN201510362747.6A CN201510362747A CN104897955A CN 104897955 A CN104897955 A CN 104897955A CN 201510362747 A CN201510362747 A CN 201510362747A CN 104897955 A CN104897955 A CN 104897955A
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China
Prior art keywords
resistance
power
circuit
electric capacity
chip
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CN201510362747.6A
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Chinese (zh)
Inventor
王翔志
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JOVISION TECHNOLOGY Co Ltd
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JOVISION TECHNOLOGY Co Ltd
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Priority to CN201510362747.6A priority Critical patent/CN104897955A/en
Publication of CN104897955A publication Critical patent/CN104897955A/en
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Abstract

An intelligent current voltmeter comprises a power supply input module, a rectification module, a single-chip microcomputer control circuit, an AD acquisition circuit, a load current acquisition circuit, a button circuit, a nixie tube display circuit and a power supply output control module. An input end of the power supply input module is connected with an external power supply, and an output end of the power supply input module is connected with a power end of the single-chip microcomputer control circuit through the rectification module. Input ends of the AD acquisition circuit and the load current acquisition circuit are connected with the power supply input module, and output ends of the AD acquisition circuit and the load current acquisition circuit are connected with a signal input end of the single-chip microcomputer control circuit. The button circuit and the nixie tube display circuit are connected with the single-chip microcomputer control circuit. An input end of the power supply output control module is connected with an output end of the power supply input module, an output end of the power supply output control module is connected with a power end of to-be-measured load equipment, and a control end of the power supply output control module is connected with the single-chip microcomputer control circuit. The intelligent current voltmeter is serially connected in a power supply circuit of the to-be-measured load equipment, can timely detect change in current and voltage of the circuit, and visually display working current and working voltage.

Description

A kind of Intelligent current voltage table
Technical field
The present invention relates to a kind of current-voltage measurement device, specifically a kind of Intelligent current voltage table.
Background technology
The design and development of digital multimeter, has had polytype and style.But existing multimeter, measurement curtage that can only be single, can not show electric current and the voltage of load equipment, and multimeter inside need be protected with fuse, once equipment burnout causes short circuit to be easy to cause multimeter to damage simultaneously.Direct-flow voltage regulation source can show voltage and current simultaneously, and effectively can protect oneself and load equipment, but the cost intensive of direct-flow voltage regulation source, be not too applicable to the test of batch.
Existing current-voltage measurement device needs to reserve test point in circuit when sensing lead device current voltage, cannot monitor in real time the current/voltage of circuit.
Summary of the invention
For the deficiencies in the prior art, the present invention proposes a kind of Intelligent current voltage table of advantage of lower cost, it can not only show voltage and current value simultaneously, and can measure current/voltage in real time.
The present invention solves the technical scheme that its technical matters takes: a kind of Intelligent current voltage table, it is characterized in that, comprise Power Entry Module, rectification module, single chip machine controlling circuit, AD Acquisition Circuit, load current Acquisition Circuit, key circuit, digital pipe display circuit and power supply output control module, the input end of described Power Entry Module is connected with external power supply, the output terminal of Power Entry Module is connected with the power end of single chip machine controlling circuit through rectification module, described AD Acquisition Circuit is connected with Power Entry Module respectively with the input end of load current Acquisition Circuit, AD Acquisition Circuit is connected with the signal input part of single chip machine controlling circuit respectively with the output terminal of load current Acquisition Circuit, described key circuit is connected with single chip machine controlling circuit respectively with digital pipe display circuit, the described input end of power supply output control module is connected with the output terminal of Power Entry Module, and the output terminal of power supply output control module is connected with the power end of measured load equipment, and the control end of power supply output control module is connected with single chip machine controlling circuit.
Further, this Intelligent current voltage table also comprises protection circuit, and described protection circuit is connected with single chip machine controlling circuit with power supply output module respectively.
Further, this Intelligent current voltage table also comprises indicator light circuit, and described indicator light circuit is connected with single chip machine controlling circuit.
Further, this Intelligent current voltage table also comprises warning circuit, and described warning circuit is connected with single chip machine controlling circuit respectively.
Preferably,
Described Power Entry Module comprises power input terminal J2 and power input terminal J3;
Described rectification module comprises stream chip U6, electric capacity C8, electric capacity C9, inductance L 1 and voltage stabilizing diode D4, the Vin end of described rectification chip U6 is held with the VIN of power input terminal J3 with power input terminal J2 respectively and is connected, be connected with 3V3 power end after the Vout end series inductance L1 of rectification chip U6, the negative pole of described voltage stabilizing diode D4 is held with the Vout of rectification chip U6 respectively and is connected with one end of inductance L 1, the plus earth of voltage stabilizing diode D4, one end of described electric capacity C8 is held with the Vin of rectification chip U6 and is connected, the other end ground connection of electric capacity C8, one end of described electric capacity C9 and the other end of inductance L 1 are held with the FB of rectification chip U6 and are connected, the other end ground connection of electric capacity C9,
Described single chip machine controlling circuit comprises single-chip microcomputer U1, electric capacity C1, electric capacity C2, electric capacity C3 and crystal oscillator Y1, the vdd terminal of described single-chip microcomputer U1 is connected with 3V3 power end, XTAL1 with the XTAL2 pin of single-chip microcomputer U1 is connected with the two ends of crystal oscillator Y1 respectively, the two ends of described crystal oscillator Y1 connect ground connection after electric capacity C1 and electric capacity C2 respectively, one end of described electric capacity C3 is connected with the vdd terminal of single-chip microcomputer U1, the other end ground connection of electric capacity C3;
Described AD Acquisition Circuit comprises resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, adjustable resistance RP1 and electric capacity C4, described resistance R3 holds with the AD-Input of single-chip microcomputer U1 and is connected, the other end of resistance R3 is connected with one end of resistance R1 with one end of electric capacity C4, one end of adjustable resistance RP1, the adjustable end of adjustable resistance RP1 respectively, the other end of resistance R1 is connected with 3V3 power end, ground connection after the other end of electric capacity C4 and the other end resistance in series R6 of adjustable resistance RP1; One end of described resistance R4 is held with the Voltage of single-chip microcomputer U1 and is connected, the other end of resistance R4 is connected with one end of resistance R5 with one end of resistance R2 respectively, the other end of resistance R2 is held with the VIN of power input terminal J3 with power input terminal J2 respectively and is connected, the other end ground connection of resistance R5;
Described load current Acquisition Circuit comprises current sense amplifier U5, resistance R16, resistance R17 and electric capacity C7, the RS+ end of described current sense amplifier U5 is held with the VIN of power input terminal J3 with power input terminal J2 respectively and is connected, the SHD end of current sense amplifier U5 and GND hold ground connection, the OUT end of current sense amplifier U5 respectively with one end of resistance R17, one end of electric capacity C7 is connected with the current end of single-chip microcomputer U1, the RS-end of current sense amplifier U5 is held with RS and is connected, ground connection after the SIG end resistance in series R16 of current sense amplifier U5, the other end of resistance R17 and the other end of electric capacity C7 ground connection respectively,
Described key circuit comprises resistance R10, resistance R11, switch S 1 and switch S 2, one end of described resistance R10 is connected with 3V3 power end, the other end is held with the KEY-Cha of single-chip microcomputer U1 respectively and is connected with one end of switch S 1, the other end ground connection of switch S 1, one end of described resistance R11 is connected with 3V3 power end, the other end is held with the KEY-Res of single-chip microcomputer U1 respectively and is connected with one end of switch S 2, the other end ground connection of switch S 2;
Described digital pipe display circuit comprises charactron driving chip U2, first common anode charactron U3, second common anode charactron U4, resistance R13, resistance R14, resistance R15, electric capacity C5 and electric capacity C6, the STB end of described charactron driving chip U2, CLK end and DIO end are held with the STB of single-chip microcomputer U1 respectively, CLK end is connected with DIO end, the SEG1 of charactron driving chip U2, SEG2, SEG3, SEG4, SEG5, SEG6, SEG7, SEG8 end respectively with the SEGA of the first common anode charactron U3 and the second common anode charactron U4, SEGB, SEGC, SEGD, SEGE, SEGF, SEGG, SEGH end is connected, the vdd terminal of charactron driving chip U2 respectively with one end of electric capacity C5, one end of electric capacity C6 is connected with 3V3 power end, the other end of electric capacity C5 and the other end of electric capacity C6 ground connection respectively, the STB end of charactron driving chip U2, CLK end and DIO end resistance in series R15 respectively, resistance R14 is connected with 3V3 power end with after resistance R13, L1, L2, L3 of described first common anode charactron U3 and L4 end holds with GER4 with GER1, GER2, GER3 of charactron driving chip U2 respectively and are connected, and L1, L2, L3 of described second common anode charactron U4 and L4 hold to hold with GER8 with GER5, GER6, GER7 of charactron driving chip U2 respectively and be connected,
Described power supply output control module comprises resistance R18, resistance R19, diode D5, second triode Q2, relay K 1, power output terminal J4 and power output terminal J5, the input end parallel connection of power output terminal J4 power output terminal J5 is held with the VIN of power input terminal J3 with power input terminal J2 respectively by the normally opened contact of relay K 1 afterwards and is connected, one end of relay K 1 coil respectively with 3V3 power end, one end of resistance R18 is connected with the negative pole of diode D5, the other end of relay K 1 coil is connected with the collector of the second triode Q2 with the positive pole of diode D5 respectively, the other end of resistance R18 is connected with the base stage of the second triode Q2 with one end of resistance R19 respectively, the other end of resistance R19 is held with the JDQ of single-chip microcomputer U1 and is connected, the grounded emitter of the second triode Q2.
Preferably; described protection circuit comprises resistance R20, resistance R21, resistance R22 and amplifier U7; hold with RS after the electrode input end resistance in series R20 of described amplifier U7 and be connected; be connected with 3V3 power end after the negative input resistance in series R22 of amplifier U7; hold with the CHK of single-chip microcomputer U1 after the output terminal resistance in series R21 of amplifier U7 and be connected; the cathode power supply end of amplifier U7 is connected with 3V3 power end, the negative power supply end ground connection of amplifier U7.
Preferably, described indicator light circuit comprises resistance R7, resistance R8, resistance R9, light emitting diode D1, light emitting diode D2 and light emitting diode D3, be connected with 3V3 power end after the cathode series resistance R7 of described light emitting diode D1, hold with the RUN of single-chip microcomputer U1 after the cathode series resistance R8 of described light emitting diode D2 and be connected, hold with the WORK of single-chip microcomputer U1 after the cathode series resistance R9 of described light emitting diode D3 and be connected, the negative pole ground connection respectively of the negative pole of light emitting diode D1, the negative pole of light emitting diode D2 and light emitting diode D3;
Preferably, described warning circuit comprises resistance R2, the first triode Q1 and hummer LS1, hold with the BEEP of single-chip microcomputer U1 after the base series resistor R12 of described first triode Q1 and be connected, be connected with 3V3 power end after the collector series connection hummer LS1 of the first triode Q1, the grounded emitter of the first triode Q1.
Preferably, described single-chip microcomputer U1 adopts S3F9454/S3F94C4 single-chip microcomputer.
Preferably, described single chip machine controlling circuit also comprises burning interface J1, and described burning interface J1 is connected with single-chip microcomputer U1.
Beneficial effect of the present invention is as follows:
Intelligent current voltage table of the present invention is connected in the supply line of tested load equipment, can the current/voltage situation of change of real-time detection circuit, show working current and the operating voltage of tested load equipment intuitively, thus the ruuning situation of tested load equipment can be checked more intuitively, single-chip microcomputer is to the data analysis gathered and can be controlled the operation of tested load equipment by power supply output control module, and solving existing current voltmeter needs when test reserve test point at circuit and can not carry out the problem of monitoring in real time to circuit.
The present invention is designed with two power input terminals simultaneously, effectively supports the input of 5V-36V Width funtion power supply, can use in the circuit of different voltage; By design AD Acquisition Circuit and load current Acquisition Circuit, and be designed with two common anode charactrons at digital pipe display circuit, current value and magnitude of voltage can be measured simultaneously, and current value and magnitude of voltage are shown simultaneously; Single chip machine controlling circuit is adopted to reduce cost as processor; Carry out anti-reverse protection by arranging protection circuit, available protecting is carried out to tested load equipment.
Accompanying drawing explanation
Fig. 1 is application connection diagram of the present invention;
Fig. 2 is structural representation of the present invention;
Fig. 3 is the circuit diagram of Power Entry Module of the present invention;
Fig. 4 is the circuit diagram of rectification module of the present invention;
Fig. 5 is the circuit diagram of single chip machine controlling circuit of the present invention;
Fig. 6 is the circuit diagram of single-chip microcomputer burning interface of the present invention;
Fig. 7 is the circuit diagram of AD Acquisition Circuit of the present invention;
Fig. 8 is the circuit diagram of load current Acquisition Circuit of the present invention;
Fig. 9 is the circuit diagram of indicator light circuit of the present invention;
Figure 10 is the circuit diagram of warning circuit of the present invention;
Figure 11 is the circuit diagram of key circuit of the present invention;
Figure 12 is the circuit diagram of digital pipe display circuit of the present invention;
Figure 13 is the circuit diagram of power supply output control module of the present invention;
Figure 14 is the circuit diagram of protection circuit of the present invention.
Embodiment
For clearly demonstrating the technical characterstic of this programme, below by embodiment, and in conjunction with its accompanying drawing, the present invention will be described in detail.Disclosing hereafter provides many different embodiments or example is used for realizing different structure of the present invention.Of the present invention open in order to simplify, hereinafter the parts of specific examples and setting are described.In addition, the present invention can in different example repeat reference numerals and/or letter.This repetition is to simplify and clearly object, itself does not indicate the relation between discussed various embodiment and/or setting.It should be noted that parts illustrated in the accompanying drawings are not necessarily drawn in proportion.Present invention omits the description of known assemblies and treatment technology and process to avoid unnecessarily limiting the present invention.
As shown in Figure 1; Intelligent current voltage table of the present invention is connected in the supply line of tested load equipment; the input of 5V-36V Width funtion power supply supported by this Intelligent current voltage table; can overcurrent value be set; there is the function exporting against short-circuit, anti-reverse and overcurrent protection; by being serially connected in the supply line of tested load equipment; can real-time detection circuit current/voltage change; the working current of the tested load equipment of display directly perceived and operating voltage; thus machine operation can be checked more intuitively, and then control the operation of tested load equipment.
As shown in Figure 2, a kind of Intelligent current voltage table of the present invention, it comprises Power Entry Module, rectification module, single chip machine controlling circuit, AD Acquisition Circuit, load current Acquisition Circuit, indicator light circuit, warning circuit, key circuit, digital pipe display circuit, power supply output control module and protection circuit, the input end of described Power Entry Module is connected with external power supply, the output terminal of Power Entry Module is connected with the power end of single chip machine controlling circuit through rectification module, described AD Acquisition Circuit is connected with Power Entry Module respectively with the input end of load current Acquisition Circuit, AD Acquisition Circuit is connected with the signal input part of single chip machine controlling circuit respectively with the output terminal of load current Acquisition Circuit, described indicator light circuit, warning circuit, key circuit is connected with single chip machine controlling circuit respectively with digital pipe display circuit, the described input end of power supply output control module is connected with the output terminal of Power Entry Module, and the output terminal of power supply output control module is connected with the power end of measured load equipment, and the control end of power supply output control module is connected with single chip machine controlling circuit, described protection circuit is connected with single chip machine controlling circuit with power supply output module respectively.
As shown in Figure 3, described Power Entry Module comprises power input terminal J2 and power input terminal J3; Although this Intelligent current voltage table is designed with power input terminal J2 and power input terminal J3 simultaneously, but they and non-concurrent are connected with extraneous power supply, but be connected with extraneous power supply after needing to select according to the interface of tested load equipment in specific implementation process.
As shown in Figure 4, described rectification module comprises stream chip U6, electric capacity C8, electric capacity C9, inductance L 1 and voltage stabilizing diode D4, the Vin end of described rectification chip U6 is held with the VIN of power input terminal J3 with power input terminal J2 respectively and is connected, be connected with 3V3 power end after the Vout end series inductance L1 of rectification chip U6, the negative pole of described voltage stabilizing diode D4 is held with the Vout of rectification chip U6 respectively and is connected with one end of inductance L 1, the plus earth of voltage stabilizing diode D4, one end of described electric capacity C8 is held with the Vin of rectification chip U6 and is connected, the other end ground connection of electric capacity C8, one end of described electric capacity C9 and the other end of inductance L 1 are held with the FB of rectification chip U6 and are connected, the other end ground connection of electric capacity C9.Input power through under C8 bypass after by U6 rectification chip, rectification exports 3.3V power supply to system power supply.Rectification chip U6 adopts LM2596-3V3 chip, the VIN end of power input terminal J2 and power input terminal J3 receives the Vin end of rectification chip U6, Vout end from rectification chip U6 after overcommutation exports, export first by arriving the earth under voltage stabilizing diode D4, chip FB pin is fed back to again through inductance L 1, by electric capacity C8 and electric capacity C9 filtering clutter, finally export clean 3.3V power supply, for this Intelligent current voltage table provides operating voltage.
As shown in Figure 5 and Figure 6, described single chip machine controlling circuit comprises single-chip microcomputer U1, electric capacity C1, electric capacity C2, electric capacity C3, crystal oscillator Y1 and burning interface J1, the vdd terminal of described single-chip microcomputer U1 is connected with 3V3 power end, XTAL1 with the XTAL2 pin of single-chip microcomputer U1 is connected with the two ends of crystal oscillator Y1 respectively, the two ends of described crystal oscillator Y1 connect ground connection after electric capacity C1 and electric capacity C2 respectively, one end of described electric capacity C3 is connected with the vdd terminal of single-chip microcomputer U1, the other end ground connection of electric capacity C3; Described burning interface J1 is connected with single-chip microcomputer U1 with RESET end by SDA end, SCL end.Described single-chip microcomputer U1 adopts S3F9454 single-chip microcomputer, and S3F9454 single-chip microcomputer is also connected with a burning interface J1.The 3.3V power supply that rectification module exports is powered to single-chip microcomputer U1, and crystal oscillator Y1 clocking makes it normal work.Single-chip microcomputer U1 is held by STB, CLK holds, DIO end controls digital pipe driving chip work, held by AD-input, Voltage holds, Current end gathers the data of D Acquisition Circuit and load current Acquisition Circuit, held by Run, Work holds control 2 pilot lamp, held by KEY-Cha, KEY-Res holds connection two buttons, control warning circuit by BEER end to report to the police, held by SDA, SCL holds, RESET end is connected with burning interface J1, to carry out the burning of single-chip microcomputer U1, the output signal of protection circuit is gathered by CHK end, the output of power supply output control module is controlled by JDQ end.
As shown in Figure 7, described AD Acquisition Circuit comprises resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, adjustable resistance RP1 and electric capacity C4, described resistance R3 holds with the AD-Input of single-chip microcomputer U1 and is connected, the other end of resistance R3 is connected with one end of resistance R1 with one end of electric capacity C4, one end of adjustable resistance RP1, the adjustable end of adjustable resistance RP1 respectively, the other end of resistance R1 is connected with 3V3 power end, ground connection after the other end of electric capacity C4 and the other end resistance in series R6 of adjustable resistance RP1, for measuring the overcurrent value of input; One end of described resistance R4 is held with the Voltage of single-chip microcomputer U1 and is connected, the other end of resistance R4 is connected with one end of resistance R5 with one end of resistance R2 respectively, the other end of resistance R2 is held with the VIN of power input terminal J3 with power input terminal J2 respectively and is connected, the other end ground connection of resistance R5, for measuring input voltage.First being processed by the voltage of divider resistance to tested load equipment, then sending to single-chip microcomputer U1 to carry out calculating end value measured value by AD-Input and Voltage end, the magnitude of voltage of A point for collecting in Fig. 7.
As shown in Figure 8, described load current Acquisition Circuit comprises current sense amplifier U5, resistance R16, resistance R17 and electric capacity C7, the RS+ end of described current sense amplifier U5 is held with the VIN of power input terminal J3 with power input terminal J2 respectively and is connected, the SHD end of current sense amplifier U5 and GND hold ground connection, the OUT end of current sense amplifier U5 respectively with one end of resistance R17, one end of electric capacity C7 is connected with the current end of single-chip microcomputer U1, the RS-end of current sense amplifier U5 is held with RS and is connected, ground connection after the SIG end resistance in series R16 of current sense amplifier U5, the other end of resistance R17 and the other end of electric capacity C7 ground connection respectively.First load current changes into voltage signal by the collection resistance of current sense amplifier U5 inside current signal, and then outputs to the AD pin of single-chip microcomputer U1 after being integrated by resistance R17 and electric capacity C7, thus completes the measurement of electric current.
As shown in Figure 9, described indicator light circuit comprises resistance R7, resistance R8, resistance R9, light emitting diode D1, light emitting diode D2 and light emitting diode D3, be connected with 3V3 power end after the cathode series resistance R7 of described light emitting diode D1, hold with the RUN of single-chip microcomputer U1 after the cathode series resistance R8 of described light emitting diode D2 and be connected, hold with the WORK of single-chip microcomputer U1 after the cathode series resistance R9 of described light emitting diode D3 and be connected, the negative pole ground connection respectively of the negative pole of light emitting diode D1, the negative pole of light emitting diode D2 and light emitting diode D3; 3.3V power end receives ground via R7 and D1, achieves the on/off instruction of 3.3V; The Run end of single-chip microcomputer U1 receives ground via R8 and D2, achieves the whether operation instruction of single-chip microcomputer U1; The Work end of single-chip microcomputer U1 receives ground via R9 and D3, achieves the instruction that whether works of single-chip microcomputer U1.
As shown in Figure 10, described warning circuit comprises resistance R12, the first triode Q1 and hummer LS1, hold with the BEEP of single-chip microcomputer U1 after the base series resistor R12 of described first triode Q1 and be connected, be connected with 3V3 power end after the collector series connection hummer LS1 of the first triode Q1, the grounded emitter of the first triode Q1.If unusual circumstance, control first triode Q1 drived control hummer is held to report to the police by the BEER of single-chip microcomputer U1.
As shown in figure 11, described key circuit comprises resistance R10, resistance R11, switch S 1 and switch S 2, one end of described resistance R10 is connected with 3V3 power end, the other end is held with the KEY-Cha of single-chip microcomputer U1 respectively and is connected with one end of switch S 1, the other end ground connection of switch S 1, one end of described resistance R11 is connected with 3V3 power end, and the other end is held with the KEY-Res of single-chip microcomputer U1 respectively and is connected with one end of switch S 2, the other end ground connection of switch S 2.The control operation of single-chip microcomputer U1 is carried out by switch S 1 and switch S 2.
As shown in figure 12, described digital pipe display circuit comprises charactron driving chip U2, first common anode charactron U3, second common anode charactron U4, resistance R13, resistance R14, resistance R15, electric capacity C5 and electric capacity C6, the STB end of described charactron driving chip U2, CLK end and DIO end are held with the STB of single-chip microcomputer U1 respectively, CLK end is connected with DIO end, the SEG1 of charactron driving chip U2, SEG2, SEG3, SEG4, SEG5, SEG6, SEG7, SEG8 end respectively with the SEGA of the first common anode charactron U3 and the second common anode charactron U4, SEGB, SEGC, SEGD, SEGE, SEGF, SEGG, SEGH end is connected, the vdd terminal of charactron driving chip U2 respectively with one end of electric capacity C5, one end of electric capacity C6 is connected with 3V3 power end, the other end of electric capacity C5 and the other end of electric capacity C6 ground connection respectively, the STB end of charactron driving chip U2, CLK end and DIO end resistance in series R15 respectively, resistance R14 is connected with 3V3 power end with after resistance R13, L1, L2, L3 of described first common anode charactron U3 and L4 end holds with GER4 with GER1, GER2, GER3 of charactron driving chip U2 respectively and are connected, and L1, L2, L3 of described second common anode charactron U4 and L4 hold to hold with GER8 with GER5, GER6, GER7 of charactron driving chip U2 respectively and be connected.Charactron driving chip U2 adopts TM1638 chip, 1,2,3,13,14 and 15 pins of TM1638 chip are blank pipe pin, first common anode charactron U3 and the second common anode charactron U4 all adopts 4 common anode charactrons, and the parallel circuit of electric capacity C5 and electric capacity C6 is arranged on the position near charactron driving chip U2.Single-chip microcomputer U1 drives charactron driving chip U2 to control the first common anode charactron U3 by STB, CLK, DIO end and the second common anode charactron U4 shows current value and magnitude of voltage simultaneously.
As shown in figure 13, described power supply output control module comprises resistance R18, resistance R19, diode D5, second triode Q2, relay K 1, power output terminal J4 and power output terminal J5, power output terminal J4 holds with the VIN of power input terminal J3 with power input terminal J2 respectively after passing through the normally opened contact of serial connection relay K 1 afterwards with the input end parallel connection of power output terminal J5 and is connected, one end of relay K 1 coil respectively with 3V3 power end, one end of resistance R18 is connected with the negative pole of diode D5, the other end of relay K 1 coil is connected with the collector of the second triode Q2 with the positive pole of diode D5 respectively, the other end of resistance R18 is connected with the base stage of the second triode Q2 with one end of resistance R19 respectively, the other end of resistance R19 is held with the JDQ of single-chip microcomputer U1 and is connected, the grounded emitter of the second triode Q2.The control signal of single-chip microcomputer U1 drives the second triode Q2 make relay K 1 coil electricity thus control the break-make of power supply output control module by current-limiting resistance R19, resistance R18 is the driving force that pull-up resistor promotes single-chip microcomputer U1, and diode D5 can suppress the instantaneous pressure of relay.
As shown in figure 14; described protection circuit comprises resistance R20, resistance R21, resistance R22 and amplifier U7; hold with RS after the electrode input end resistance in series R20 of described amplifier U7 and be connected; be connected with 3V3 power end after the negative input resistance in series R22 of amplifier U7; hold with the CHK of single-chip microcomputer U1 after the output terminal resistance in series R21 of amplifier U7 and be connected; the cathode power supply end of amplifier U7 is connected with 3V3 power end, the negative power supply end ground connection of amplifier U7.Reverse-connection preventing circuit is constituted by resistance R20, resistance R21, resistance R22 and amplifier U7, judged the correctness exported by the height of the output end voltage and 3.3V voltage that compare power supply output control module, last result exports to single-chip microcomputer U1 by 1 pin of amplifier U7.
The above is the preferred embodiment of the present invention, and for those skilled in the art, under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications are also regarded as protection scope of the present invention.

Claims (10)

1. an Intelligent current voltage table, it is characterized in that, comprise Power Entry Module, rectification module, single chip machine controlling circuit, AD Acquisition Circuit, load current Acquisition Circuit, key circuit, digital pipe display circuit and power supply output control module, the input end of described Power Entry Module is connected with external power supply, the output terminal of Power Entry Module is connected with the power end of single chip machine controlling circuit through rectification module, described AD Acquisition Circuit is connected with Power Entry Module respectively with the input end of load current Acquisition Circuit, AD Acquisition Circuit is connected with the signal input part of single chip machine controlling circuit respectively with the output terminal of load current Acquisition Circuit, described key circuit is connected with single chip machine controlling circuit respectively with digital pipe display circuit, the described input end of power supply output control module is connected with the output terminal of Power Entry Module, and the output terminal of power supply output control module is connected with the power end of measured load equipment, and the control end of power supply output control module is connected with single chip machine controlling circuit.
2. a kind of Intelligent current voltage table according to claim 1, it is characterized in that, also comprise protection circuit, described protection circuit is connected with single chip machine controlling circuit with power supply output module respectively.
3. a kind of Intelligent current voltage table according to claim 1, it is characterized in that, also comprise indicator light circuit, described indicator light circuit is connected with single chip machine controlling circuit.
4. a kind of Intelligent current voltage table according to claim 1, it is characterized in that, also comprise warning circuit, described warning circuit is connected with single chip machine controlling circuit respectively.
5. a kind of Intelligent current voltage table according to any one of Claims 1-4, is characterized in that,
Described Power Entry Module comprises power input terminal J2 and power input terminal J3;
Described rectification module comprises stream chip U6, electric capacity C8, electric capacity C9, inductance L 1 and voltage stabilizing diode D4, the Vin end of described rectification chip U6 is held with the VIN of power input terminal J3 with power input terminal J2 respectively and is connected, be connected with 3V3 power end after the Vout end series inductance L1 of rectification chip U6, the negative pole of described voltage stabilizing diode D4 is held with the Vout of rectification chip U6 respectively and is connected with one end of inductance L 1, the plus earth of voltage stabilizing diode D4, one end of described electric capacity C8 is held with the Vin of rectification chip U6 and is connected, the other end ground connection of electric capacity C8, one end of described electric capacity C9 and the other end of inductance L 1 are held with the FB of rectification chip U6 and are connected, the other end ground connection of electric capacity C9,
Described single chip machine controlling circuit comprises single-chip microcomputer U1, electric capacity C1, electric capacity C2, electric capacity C3 and crystal oscillator Y1, the vdd terminal of described single-chip microcomputer U1 is connected with 3V3 power end, XTAL1 with the XTAL2 pin of single-chip microcomputer U1 is connected with the two ends of crystal oscillator Y1 respectively, the two ends of described crystal oscillator Y1 connect ground connection after electric capacity C1 and electric capacity C2 respectively, one end of described electric capacity C3 is connected with the vdd terminal of single-chip microcomputer U1, the other end ground connection of electric capacity C3;
Described AD Acquisition Circuit comprises resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, adjustable resistance RP1 and electric capacity C4, described resistance R3 holds with the AD-Input of single-chip microcomputer U1 and is connected, the other end of resistance R3 is connected with one end of resistance R1 with one end of electric capacity C4, one end of adjustable resistance RP1, the adjustable end of adjustable resistance RP1 respectively, the other end of resistance R1 is connected with 3V3 power end, ground connection after the other end of electric capacity C4 and the other end resistance in series R6 of adjustable resistance RP1; One end of described resistance R4 is held with the Voltage of single-chip microcomputer U1 and is connected, the other end of resistance R4 is connected with one end of resistance R5 with one end of resistance R2 respectively, the other end of resistance R2 is held with the VIN of power input terminal J3 with power input terminal J2 respectively and is connected, the other end ground connection of resistance R5;
Described load current Acquisition Circuit comprises current sense amplifier U5, resistance R16, resistance R17 and electric capacity C7, the RS+ end of described current sense amplifier U5 is held with the VIN of power input terminal J3 with power input terminal J2 respectively and is connected, the SHD end of current sense amplifier U5 and GND hold ground connection, the OUT end of current sense amplifier U5 respectively with one end of resistance R17, one end of electric capacity C7 is connected with the current end of single-chip microcomputer U1, the RS-end of current sense amplifier U5 is held with RS and is connected, ground connection after the SIG end resistance in series R16 of current sense amplifier U5, the other end of resistance R17 and the other end of electric capacity C7 ground connection respectively,
Described key circuit comprises resistance R10, resistance R11, switch S 1 and switch S 2, one end of described resistance R10 is connected with 3V3 power end, the other end is held with the KEY-Cha of single-chip microcomputer U1 respectively and is connected with one end of switch S 1, the other end ground connection of switch S 1, one end of described resistance R11 is connected with 3V3 power end, the other end is held with the KEY-Res of single-chip microcomputer U1 respectively and is connected with one end of switch S 2, the other end ground connection of switch S 2;
Described digital pipe display circuit comprises charactron driving chip U2, first common anode charactron U3, second common anode charactron U4, resistance R13, resistance R14, resistance R15, electric capacity C5 and electric capacity C6, the STB end of described charactron driving chip U2, CLK end and DIO end are held with the STB of single-chip microcomputer U1 respectively, CLK end is connected with DIO end, the SEG1 of charactron driving chip U2, SEG2, SEG3, SEG4, SEG5, SEG6, SEG7, SEG8 end respectively with the SEGA of the first common anode charactron U3 and the second common anode charactron U4, SEGB, SEGC, SEGD, SEGE, SEGF, SEGG, SEGH end is connected, the vdd terminal of charactron driving chip U2 respectively with one end of electric capacity C5, one end of electric capacity C6 is connected with 3V3 power end, the other end of electric capacity C5 and the other end of electric capacity C6 ground connection respectively, the STB end of charactron driving chip U2, CLK end and DIO end resistance in series R15 respectively, resistance R14 is connected with 3V3 power end with after resistance R13, L1, L2, L3 of described first common anode charactron U3 and L4 end holds with GER4 with GER1, GER2, GER3 of charactron driving chip U2 respectively and are connected, and L1, L2, L3 of described second common anode charactron U4 and L4 hold to hold with GER8 with GER5, GER6, GER7 of charactron driving chip U2 respectively and be connected,
Described power supply output control module comprises resistance R18, resistance R19, diode D5, second triode Q2, relay K 1, power output terminal J4 and power output terminal J5, power output terminal J4 is held with the VIN of power input terminal J3 with power input terminal J2 respectively by the normally opened contact of relay K 1 afterwards with the input end parallel connection of power output terminal J5 and is connected, one end of relay K 1 coil respectively with 3V3 power end, one end of resistance R18 is connected with the negative pole of diode D5, the other end of relay K 1 coil is connected with the collector of the second triode Q2 with the positive pole of diode D5 respectively, the other end of resistance R18 is connected with the base stage of the second triode Q2 with one end of resistance R19 respectively, the other end of resistance R19 is held with the JDQ of single-chip microcomputer U1 and is connected, the grounded emitter of the second triode Q2.
6. a kind of Intelligent current voltage table according to claim 5; it is characterized in that; described protection circuit comprises resistance R20, resistance R21, resistance R22 and amplifier U7; hold with RS after the electrode input end resistance in series R20 of described amplifier U7 and be connected; be connected with 3V3 power end after the negative input resistance in series R22 of amplifier U7; hold with the CHK of single-chip microcomputer U1 after the output terminal resistance in series R21 of amplifier U7 and be connected; the cathode power supply end of amplifier U7 is connected with 3V3 power end, the negative power supply end ground connection of amplifier U7.
7. a kind of Intelligent current voltage table according to claim 5, it is characterized in that, described indicator light circuit comprises resistance R7, resistance R8, resistance R9, light emitting diode D1, light emitting diode D2 and light emitting diode D3, be connected with 3V3 power end after the cathode series resistance R7 of described light emitting diode D1, hold with the RUN of single-chip microcomputer U1 after the cathode series resistance R8 of described light emitting diode D2 and be connected, hold with the WORK of single-chip microcomputer U1 after the cathode series resistance R9 of described light emitting diode D3 and be connected, the negative pole of light emitting diode D1, the negative pole of light emitting diode D2 and the negative pole of light emitting diode D3 ground connection respectively.
8. a kind of Intelligent current voltage table according to claim 5, it is characterized in that, described warning circuit comprises resistance R12, the first triode Q1 and hummer LS1, hold with the BEEP of single-chip microcomputer U1 after the base series resistor R12 of described first triode Q1 and be connected, be connected with 3V3 power end after the collector series connection hummer LS1 of the first triode Q1, the grounded emitter of the first triode Q1.
9. a kind of Intelligent current voltage table according to claim 5, is characterized in that, described single-chip microcomputer U1 adopts S3F9454/S3F94C4 single-chip microcomputer.
10. a kind of Intelligent current voltage table according to claim 5, is characterized in that, described single chip machine controlling circuit also comprises burning interface J1, and described burning interface J1 is connected with single-chip microcomputer U1.
CN201510362747.6A 2015-06-26 2015-06-26 Intelligent current voltmeter Pending CN104897955A (en)

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Application publication date: 20150909