CN205581185U - DC -AC converter measuring device - Google Patents
DC -AC converter measuring device Download PDFInfo
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- CN205581185U CN205581185U CN201620140893.4U CN201620140893U CN205581185U CN 205581185 U CN205581185 U CN 205581185U CN 201620140893 U CN201620140893 U CN 201620140893U CN 205581185 U CN205581185 U CN 205581185U
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- 238000005070 sampling Methods 0.000 claims abstract description 32
- 238000005259 measurement Methods 0.000 claims abstract description 28
- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 27
- 238000004804 winding Methods 0.000 claims description 30
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
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Abstract
The utility model relates to a DC AC converter measuring device belongs to automatic measure technical field. The utility model discloses a singlechip, sampling circuit I, sampling circuit II, measuring circuit, relay, button module, liquid crystal module, reference cell, temperature protection circuit, does sampling circuit I, DC await measuring AC converter 1 is connected with the sampling circuit II order, the sampling circuit II output with measure circuit input end and link to each other, the measuring circuit output with is connected the singlechip and links to each other, relay one end is connected with the singlechip, other end connection is at the DC power supply input, sampling circuit I, button module, liquid crystal module, reference cell, temperature protection circuit all are connected with the singlechip. This device measurement accuracy is high, the good reliability, and the security is high, and the structure is simple and easy, and low in manufacturing cost has the function of measuring electric energy, voltage, electric current, active power, reactive power, power factor isoparametric simultaneously, and measurement accuracy is high, has protect function, and the practicality is high.
Description
Technical field
This utility model relates to a kind of DC-AC changer measurement apparatus, belongs to automatic measurement technology field.
Background technology
Along with the development of Power Electronic Technique, various electronic installations are more and more higher to the requirement of power, and the requirement to electric current is the most increasing, and Switching Power Supply develops to greater power direction.Develop various Switching Power Supply high-power, high performance and become trend.DC-AC(DC inversion exchange especially) inverter, but existing method of testing needs tester to use four pieces of circuit testers, side input and output voltage electric current respectively, have then by artificial reading and manual calculations result, and exist owing to during test, short circuit can burn out test module, test trouble, efficiency is low.The most present circuit tester does not have power factor, electric energy measurement function, and existing power-factor measurement instrument is costly.
Summary of the invention
The technical problems to be solved in the utility model is: this utility model provides one, DC-AC changer measurement apparatus, inconvenience and the inaccurate problem of result that input and output voltage electric current brings is measured for solving prior art, and solve owing to during test, short circuit can burn out test module, test trouble, inefficient problem.This device can realize automatically measuring input and output voltage electric current and power.
Technical solutions of the utility model are: a kind of DC-AC changer measurement apparatus, including single-chip microcomputer 2, sample circuit I3, sample circuit II4, measuring circuit 5, relay 6, key-press module 7, Liquid Crystal Module 8, reference cell 9, temperature protection circuit 10；Described sample circuit I3, DC-AC changer 1 to be measured and sample circuit II4 are sequentially connected with; sample circuit I3 is connected with single-chip microcomputer 2; sample circuit II4 outfan is connected with measuring circuit 5 input; measuring circuit 5 outfan is connected with being connected single-chip microcomputer 2; relay 6 one end is connected with single-chip microcomputer 2; the other end is connected to DC supply input, and key-press module 7, Liquid Crystal Module 8 are all connected with single-chip microcomputer 2, and reference cell 9, temperature protection circuit 10 are the most all connected with single-chip microcomputer 2.
Described single-chip microcomputer 2 uses STC12C5A60S2 model single-chip microcomputer；Sample circuit I3 is connected with the AD mouth of single-chip microcomputer 2; sample circuit II4 outfan is connected with measuring circuit 5 input; measuring circuit 5 outfan is connected with the I/O mouth of single-chip microcomputer 2; relay 6 one end is connected with the I/O mouth of single-chip microcomputer 2; the other end is connected to DC supply input; key-press module 7, Liquid Crystal Module 8 are connected with the I/O mouth of single-chip microcomputer 2 respectively, and reference cell 9, temperature protection circuit 10 are connected with the AD mouth of single-chip microcomputer 2.
Described sample circuit I3 includes DC voltage sample circuit and DC current sample circuit, and sample circuit II4 includes alternating voltage sampling circuit and alternating current sample circuit.
Described adopt described DC voltage sample circuit and include resistance R1 and R2；Resistance R1, R2 connect, and series connection point is connected with the AD2 mouth of single-chip microcomputer 2；DC current sample circuit includes sampling resistor R3, amplifier module；Wherein amplifier module includes resistance R9, R10, R11, potentiometer R12, operational amplifier Q, inductance L, Zener diode D, electric capacity C；
Resistance R3 is connected on the negative pole of DC supply input, one end of resistance R3 is connected with one end of resistance R9, the resistance R9 other end respectively with one end of resistance R11, the input in the same direction of operational amplifier Q is connected, the other end ground connection of resistance R11, the other end of resistance R3 is connected with one end of resistance R10, the resistance R10 other end respectively with the reverse input end of operational amplifier Q, potentiometer R12 is connected, the potentiometer R12 other end is connected with operational amplifier Q output, the outfan of operational amplifier Q the most respectively with Zener diode D negative pole, one end of inductance L is connected, Zener diode D plus earth, inductance L other end AD1 mouth with electric capacity C positive pole and single-chip microcomputer 2 respectively is connected, electric capacity C1 minus earth；Constitute a second-order filter by inductance L and electric capacity C, the interference harmonic wave of sampling is carried out a filtering, improves sampling precision；In order to prevent the AD mouth of the input signal excessive damage single-chip microcomputer 2 of single-chip microcomputer 2 after sampling, have employed a Zener diode D and carry out amplitude limit.
Alternating voltage sampling circuit includes voltage transformer pt, resistance R4, resistance R5；Alternating current sample circuit includes Current Transmit, resistance R6；
After first side winding series resistance R4 of voltage transformer pt in parallel with output AC voltage, secondary side winding is in parallel with resistance R5, secondary side winding one end ground connection after parallel connection, one end is connected with the Vin end measuring chip of measuring circuit 5, the first side winding series connection incoming transport outlet side of Current Transmit, secondary side winding is in parallel with resistance R6, the secondary side winding one end ground connection after parallel connection, and one end is connected with the Iin end measuring chip.
The employing STC12C5A60S2 model single-chip microcomputer of described single-chip microcomputer 2, the measurement chip of described measuring circuit 5 uses CS5460A.
Described reference cell 9 uses reference voltage chip LM1117.
Described key-press module 7 is made up of three buttons, be respectively "+", "-", " function selecting "；
Described relay 6 is made up of relay coil KM2 and relay normally-closed contact KM1, and relay coil KM2 one end is connected with single-chip microcomputer 2, other end ground connection, and relay normally-closed contact KM1 is connected on the positive pole of DC supply input；
Described temperature protection circuit 10 is made up of resistance R7 and critesistor R8, and resistance R7 one end is connected with VCC, and resistance R7 connects with critesistor R8, and series connection point is connected with the AD4 mouth of single-chip microcomputer 2.
Operation principle of the present utility model is:
By key-press module 7, stream under-voltage protection threshold value and the stable voltage of output were set; it is energized to DC-DC converter 1 to be measured; sample circuit I 3 real-time sampling input direct voltage and electric current; the inside AD(single-chip microcomputer 2 of single-chip microcomputer 2 have carry internal AD function) voltage of real-time sampling reference cell 9 and preferable reference value compare; the singlechip technology of the process routine that this compares can be achieved with; then calibration sample circuit I3 sampling obtain DC voltage and current signal; the DC voltage and current signal making sampling obtain is more accurate, and shows on Liquid Crystal Module 8；Sample circuit II4 samples output AC voltage electric current, transmit data to measuring circuit 5, showing that the amplitude of input ac voltage electric current, phase data pass to single-chip microcomputer 2 through measuring circuit 5, single-chip microcomputer 2 utilizes existing conventional techniques by displays such as the virtual value of input ac voltage electric current measured, power factors on Liquid Crystal Module 8；Liquid Crystal Module 8 shows input direct voltage current value, output AC voltage current effective value, efficiency and the parameter such as electric energy, power factor.When single-chip microcomputer 2 detects that output electric current exceedes protective current, or output voltage is less than threshold value, or when chip temperature is too high, single-chip microcomputer 2 exports a signal and disconnects input circuit to relay 6, relay 6.
The use step of this DC-AC changer measurement apparatus is:
The first step: arranging overcurrent protection threshold value by button 7 is Id, under-voltage protection threshold value be the stable voltage of Ud and output be Uo.
Second step: be energized to DC-AC changer 1 to be measured.
3rd step: input dc power, sample circuit I 3 real-time sampling output DC voltage and electric current, the voltage of the inside AD real-time sampling reference cell of single-chip microcomputer 2 and preferable reference value compare, the singlechip technology of the process routine that this compares can be achieved with, then the signal that calibration sample circuit I 3 sampling obtains, the signal making sampling obtain is more accurate, and shows on Liquid Crystal Module 8.
4th step: sample circuit II 4 samples alternating voltage and the electric current of input, transmits data to measuring circuit 5, through measuring circuit 5, signal is passed to single-chip microcomputer 2, then the parameters measured is shown on Liquid Crystal Module 8.
5th step: Liquid Crystal Module 8 shows input direct voltage current value, output AC voltage current effective value, voltage regulation factor, efficiency and the parameter such as electric energy, power factor.
Efficiency is:
P=(active power of output)/(input voltage * input current) * 100%
6th step: when single-chip microcomputer 2 detects that output electric current exceedes protective current, or output voltage is less than threshold value, or when chip temperature is too high, single-chip microcomputer 2 exports a signal and disconnects input circuit to relay 6, relay 6.
7th step: when this system does not works, cuts off power supply.
The beneficial effects of the utility model are: this measurement device precision is high; highly reliable; safety is high; simple structure; low cost of manufacture, has measurement electric energy, voltage, electric current, active power, reactive power, the isoparametric function of power factor simultaneously, and the precision of measurement is high; there is defencive function, have the highest practicality.
Accompanying drawing explanation
Fig. 1 is that this utility model connects block diagram；
Fig. 2 is that this utility model concrete function structure connects block diagram；
Fig. 3 is this utility model DC current sample circuit schematic diagram.
Each label: 1-DC-AC to be measured changer in Fig. 1-3,2-single-chip microcomputer, 3-sample circuit I; 4-sample circuit II; 5-measuring circuit, 6-relay, 7-key-press module; 8-Liquid Crystal Module; 9-reference cell, 10-temperature protection circuit, PT-voltage transformer; CT-current transformer; R1, R2, R3, R4, R5, R6, R7, R9, R10, R11-fixed value resistance, R8-critesistor, R12-potentiometer; C-electric capacity; Q-operational amplifier, L-inductance, D-Zener diode; KM1-relay normally-closed contact, KM2-relay coil.
Detailed description of the invention
Below in conjunction with the accompanying drawings and specific embodiment, the utility model is described in further detail.
Embodiment 1: as Figure 1-3, a kind of DC-AC changer measurement apparatus, include single-chip microcomputer 2, sample circuit I3, sample circuit II4, measuring circuit 5, relay 6, key-press module 7, Liquid Crystal Module 8, reference cell 9, temperature protection circuit 10；Described sample circuit I3, DC-AC changer 1 to be measured and sample circuit II4 are sequentially connected with; sample circuit I3 is connected with single-chip microcomputer 2; sample circuit II4 outfan is connected with measuring circuit 5 input; measuring circuit 5 outfan is connected with being connected single-chip microcomputer 2; relay 6 one end is connected with single-chip microcomputer 2; the other end is connected to DC supply input, and key-press module 7, Liquid Crystal Module 8 are all connected with single-chip microcomputer 2, and reference cell 9, temperature protection circuit 10 are the most all connected with single-chip microcomputer 2.
Described single-chip microcomputer 2 uses STC12C5A60S2 model single-chip microcomputer；Sample circuit I3 is connected with the AD mouth of single-chip microcomputer 2; sample circuit II4 outfan is connected with measuring circuit 5 input; measuring circuit 5 outfan is connected with the I/O mouth of single-chip microcomputer 2; relay 6 one end is connected with the I/O mouth of single-chip microcomputer 2; the other end is connected to DC supply input; key-press module 7, Liquid Crystal Module 8 are connected with the I/O mouth of single-chip microcomputer 2 respectively, and reference cell 9, temperature protection circuit 10 are connected with the AD mouth of single-chip microcomputer 2.
Embodiment 2: as Figure 1-3, a kind of DC-AC changer measurement apparatus, include single-chip microcomputer 2, sample circuit I3, sample circuit II4, measuring circuit 5, relay 6, key-press module 7, Liquid Crystal Module 8, reference cell 9, temperature protection circuit 10；Described sample circuit I3, DC-AC changer 1 to be measured and sample circuit II4 are sequentially connected with; sample circuit I3 is connected with single-chip microcomputer 2; sample circuit II4 outfan is connected with measuring circuit 5 input; measuring circuit 5 outfan is connected with being connected single-chip microcomputer 2; relay 6 one end is connected with single-chip microcomputer 2; the other end is connected to DC supply input, and key-press module 7, Liquid Crystal Module 8 are all connected with single-chip microcomputer 2, and reference cell 9, temperature protection circuit 10 are the most all connected with single-chip microcomputer 2.
Described single-chip microcomputer 2 uses STC12C5A60S2 model single-chip microcomputer；Sample circuit I3 is connected with the AD mouth of single-chip microcomputer 2; sample circuit II4 outfan is connected with measuring circuit 5 input; measuring circuit 5 outfan is connected with the I/O mouth of single-chip microcomputer 2; relay 6 one end is connected with the I/O mouth of single-chip microcomputer 2; the other end is connected to DC supply input; key-press module 7, Liquid Crystal Module 8 are connected with the I/O mouth of single-chip microcomputer 2 respectively, and reference cell 9, temperature protection circuit 10 are connected with the AD mouth of single-chip microcomputer 2.
Described sample circuit I3 includes DC voltage sample circuit and DC current sample circuit, and sample circuit II4 includes alternating voltage sampling circuit and alternating current sample circuit.
Described adopt described DC voltage sample circuit and include resistance R1 and R2；Resistance R1, R2 connect, and series connection point is connected with the AD2 mouth of single-chip microcomputer 2；DC current sample circuit includes sampling resistor R3, amplifier module；Wherein amplifier module includes resistance R9, R10, R11, potentiometer R12, operational amplifier Q, inductance L, Zener diode D, electric capacity C；
Resistance R3 is connected on the negative pole of DC supply input, one end of resistance R3 is connected with one end of resistance R9, the resistance R9 other end respectively with one end of resistance R11, the input in the same direction of operational amplifier Q is connected, the other end ground connection of resistance R11, the other end of resistance R3 is connected with one end of resistance R10, the resistance R10 other end respectively with the reverse input end of operational amplifier Q, potentiometer R12 is connected, the potentiometer R12 other end is connected with operational amplifier Q output, the outfan of operational amplifier Q the most respectively with Zener diode D negative pole, one end of inductance L is connected, Zener diode D plus earth, inductance L other end AD1 mouth with electric capacity C positive pole and single-chip microcomputer 2 respectively is connected, electric capacity C1 minus earth；
Alternating voltage sampling circuit includes voltage transformer pt, resistance R4, resistance R5；Alternating current sample circuit includes Current Transmit, resistance R6；
After first side winding series resistance R4 of voltage transformer pt in parallel with output AC voltage, secondary side winding is in parallel with resistance R5, secondary side winding one end ground connection after parallel connection, one end is connected with the Vin end measuring chip of measuring circuit 5, the first side winding series connection incoming transport outlet side of Current Transmit, secondary side winding is in parallel with resistance R6, the secondary side winding one end ground connection after parallel connection, and one end is connected with the Iin end measuring chip.
Embodiment 3: as Figure 1-3, a kind of DC-AC changer measurement apparatus, include single-chip microcomputer 2, sample circuit I3, sample circuit II4, measuring circuit 5, relay 6, key-press module 7, Liquid Crystal Module 8, reference cell 9, temperature protection circuit 10；Described sample circuit I3, DC-AC changer 1 to be measured and sample circuit II4 are sequentially connected with; sample circuit I3 is connected with single-chip microcomputer 2; sample circuit II4 outfan is connected with measuring circuit 5 input; measuring circuit 5 outfan is connected with being connected single-chip microcomputer 2; relay 6 one end is connected with single-chip microcomputer 2; the other end is connected to DC supply input, and key-press module 7, Liquid Crystal Module 8 are all connected with single-chip microcomputer 2, and reference cell 9, temperature protection circuit 10 are the most all connected with single-chip microcomputer 2.
Described single-chip microcomputer 2 uses STC12C5A60S2 model single-chip microcomputer；Sample circuit I3 is connected with the AD mouth of single-chip microcomputer 2; sample circuit II4 outfan is connected with measuring circuit 5 input; measuring circuit 5 outfan is connected with the I/O mouth of single-chip microcomputer 2; relay 6 one end is connected with the I/O mouth of single-chip microcomputer 2; the other end is connected to DC supply input; key-press module 7, Liquid Crystal Module 8 are connected with the I/O mouth of single-chip microcomputer 2 respectively, and reference cell 9, temperature protection circuit 10 are connected with the AD mouth of single-chip microcomputer 2.
Described sample circuit I3 includes DC voltage sample circuit and DC current sample circuit, and sample circuit II4 includes alternating voltage sampling circuit and alternating current sample circuit.
Described adopt described DC voltage sample circuit and include resistance R1 and R2；Resistance R1, R2 connect, and series connection point is connected with the AD2 mouth of single-chip microcomputer 2；DC current sample circuit includes sampling resistor R3, amplifier module；Wherein amplifier module includes resistance R9, R10, R11, potentiometer R12, operational amplifier Q, inductance L, Zener diode D, electric capacity C；
Resistance R3 is connected on the negative pole of DC supply input, one end of resistance R3 is connected with one end of resistance R9, the resistance R9 other end respectively with one end of resistance R11, the input in the same direction of operational amplifier Q is connected, the other end ground connection of resistance R11, the other end of resistance R3 is connected with one end of resistance R10, the resistance R10 other end respectively with the reverse input end of operational amplifier Q, potentiometer R12 is connected, the potentiometer R12 other end is connected with operational amplifier Q output, the outfan of operational amplifier Q the most respectively with Zener diode D negative pole, one end of inductance L is connected, Zener diode D plus earth, inductance L other end AD1 mouth with electric capacity C positive pole and single-chip microcomputer 2 respectively is connected, electric capacity C1 minus earth；
Alternating voltage sampling circuit includes voltage transformer pt, resistance R4, resistance R5；Alternating current sample circuit includes Current Transmit, resistance R6；
After first side winding series resistance R4 of voltage transformer pt in parallel with output AC voltage, secondary side winding is in parallel with resistance R5, secondary side winding one end ground connection after parallel connection, one end is connected with the Vin end measuring chip of measuring circuit 5, the first side winding series connection incoming transport outlet side of Current Transmit, secondary side winding is in parallel with resistance R6, the secondary side winding one end ground connection after parallel connection, and one end is connected with the Iin end measuring chip.
The employing STC12C5A60S2 model single-chip microcomputer of described single-chip microcomputer 2, the measurement chip of described measuring circuit 5 uses CS5460A.
Described reference cell 9 uses reference voltage chip LM1117.
Embodiment 4: as Figure 1-3, a kind of DC-AC changer measurement apparatus, include single-chip microcomputer 2, sample circuit I3, sample circuit II4, measuring circuit 5, relay 6, key-press module 7, Liquid Crystal Module 8, reference cell 9, temperature protection circuit 10；Described sample circuit I3, DC-AC changer 1 to be measured and sample circuit II4 are sequentially connected with; sample circuit I3 is connected with single-chip microcomputer 2; sample circuit II4 outfan is connected with measuring circuit 5 input; measuring circuit 5 outfan is connected with being connected single-chip microcomputer 2; relay 6 one end is connected with single-chip microcomputer 2; the other end is connected to DC supply input, and key-press module 7, Liquid Crystal Module 8 are all connected with single-chip microcomputer 2, and reference cell 9, temperature protection circuit 10 are the most all connected with single-chip microcomputer 2.
Described single-chip microcomputer 2 uses STC12C5A60S2 model single-chip microcomputer；Sample circuit I3 is connected with the AD mouth of single-chip microcomputer 2; sample circuit II4 outfan is connected with measuring circuit 5 input; measuring circuit 5 outfan is connected with the I/O mouth of single-chip microcomputer 2; relay 6 one end is connected with the I/O mouth of single-chip microcomputer 2; the other end is connected to DC supply input; key-press module 7, Liquid Crystal Module 8 are connected with the I/O mouth of single-chip microcomputer 2 respectively, and reference cell 9, temperature protection circuit 10 are connected with the AD mouth of single-chip microcomputer 2.
Described sample circuit I3 includes DC voltage sample circuit and DC current sample circuit, and sample circuit II4 includes alternating voltage sampling circuit and alternating current sample circuit.
Described adopt described DC voltage sample circuit and include resistance R1 and R2；Resistance R1, R2 connect, and series connection point is connected with the AD2 mouth of single-chip microcomputer 2；DC current sample circuit includes sampling resistor R3, amplifier module；Wherein amplifier module includes resistance R9, R10, R11, potentiometer R12, operational amplifier Q, inductance L, Zener diode D, electric capacity C；
Resistance R3 is connected on the negative pole of DC supply input, one end of resistance R3 is connected with one end of resistance R9, the resistance R9 other end respectively with one end of resistance R11, the input in the same direction of operational amplifier Q is connected, the other end ground connection of resistance R11, the other end of resistance R3 is connected with one end of resistance R10, the resistance R10 other end respectively with the reverse input end of operational amplifier Q, potentiometer R12 is connected, the potentiometer R12 other end is connected with operational amplifier Q output, the outfan of operational amplifier Q the most respectively with Zener diode D negative pole, one end of inductance L is connected, Zener diode D plus earth, inductance L other end AD1 mouth with electric capacity C positive pole and single-chip microcomputer 2 respectively is connected, electric capacity C1 minus earth；
Alternating voltage sampling circuit includes voltage transformer pt, resistance R4, resistance R5；Alternating current sample circuit includes Current Transmit, resistance R6；
After first side winding series resistance R4 of voltage transformer pt in parallel with output AC voltage, secondary side winding is in parallel with resistance R5, secondary side winding one end ground connection after parallel connection, one end is connected with the Vin end measuring chip of measuring circuit 5, the first side winding series connection incoming transport outlet side of Current Transmit, secondary side winding is in parallel with resistance R6, the secondary side winding one end ground connection after parallel connection, and one end is connected with the Iin end measuring chip.
The employing STC12C5A60S2 model single-chip microcomputer of described single-chip microcomputer 2, the measurement chip of described measuring circuit 5 uses CS5460A.
Described reference cell 9 uses reference voltage chip LM1117.
Described key-press module 7 is made up of three buttons, be respectively "+", "-", " function selecting "；
Described relay 6 is made up of relay coil KM2 and relay normally-closed contact KM1, and relay coil KM2 one end is connected with single-chip microcomputer 2, other end ground connection, and relay normally-closed contact KM1 is connected on the positive pole of DC supply input；
Described temperature protection circuit 10 is made up of resistance R7 and critesistor R8, and resistance R7 one end is connected with VCC, and resistance R7 connects with critesistor R8, and series connection point is connected with the AD4 mouth of single-chip microcomputer 2.
Above in conjunction with accompanying drawing, specific embodiment of the utility model is explained in detail, but this utility model is not limited to above-described embodiment, in the ken that those of ordinary skill in the art are possessed, it is also possible on the premise of without departing from this utility model objective, various changes can be made.
Claims (7)
1. a DC-AC changer measurement apparatus, it is characterised in that: include single-chip microcomputer (2), sample circuit I(3), sample circuit II(4), measuring circuit (5), relay (6), key-press module (7), Liquid Crystal Module (8), reference cell (9), temperature protection circuit (10)；Described sample circuit I(3), DC-AC changer (1) to be measured and sample circuit II(4) it is sequentially connected with, sample circuit I(3) it is connected with single-chip microcomputer (2), sample circuit II(4) outfan is connected with measuring circuit (5) input, measuring circuit (5) outfan is connected with being connected single-chip microcomputer (2), relay (6) one end is connected with single-chip microcomputer (2), the other end is connected to DC supply input, key-press module (7), Liquid Crystal Module (8) is all connected with single-chip microcomputer (2), reference cell (9), temperature protection circuit (10) is the most all connected with single-chip microcomputer (2).
DC-AC changer measurement apparatus the most according to claim 1, it is characterised in that: described single-chip microcomputer (2) uses STC12C5A60S2 model single-chip microcomputer；Sample circuit I(3) it is connected with the AD mouth of single-chip microcomputer (2); sample circuit II(4) outfan is connected with measuring circuit (5) input; measuring circuit (5) outfan is connected with the I/O mouth of single-chip microcomputer (2); relay (6) one end is connected with the I/O mouth of single-chip microcomputer (2); the other end is connected to DC supply input; key-press module (7), Liquid Crystal Module (8) I/O mouth with single-chip microcomputer (2) respectively is connected, and reference cell (9), temperature protection circuit (10) are connected with the AD mouth of single-chip microcomputer (2).
DC-AC changer measurement apparatus the most according to claim 1, it is characterized in that: described sample circuit I(3) include DC voltage sample circuit and DC current sample circuit, sample circuit II(4) include alternating voltage sampling circuit and alternating current sample circuit.
DC-AC changer measurement apparatus the most according to claim 3, it is characterised in that: described DC voltage sample circuit includes resistance R1 and R2；Resistance R1, R2 connect, and series connection point is connected with the AD2 mouth of single-chip microcomputer (2)；DC current sample circuit includes sampling resistor R3, amplifier module；Wherein amplifier module includes resistance R9, R10, R11, potentiometer R12, operational amplifier Q, inductance L, Zener diode D, electric capacity C；
Resistance R3 is connected on the negative pole of DC supply input, one end of resistance R3 is connected with one end of resistance R9, the resistance R9 other end respectively with one end of resistance R11, the input in the same direction of operational amplifier Q is connected, the other end ground connection of resistance R11, the other end of resistance R3 is connected with one end of resistance R10, the resistance R10 other end respectively with the reverse input end of operational amplifier Q, potentiometer R12 is connected, the potentiometer R12 other end is connected with operational amplifier Q output, the outfan of operational amplifier Q the most respectively with Zener diode D negative pole, one end of inductance L is connected, Zener diode D plus earth, inductance L other end AD1 mouth with electric capacity C positive pole and single-chip microcomputer (2) respectively is connected, electric capacity C1 minus earth；
Alternating voltage sampling circuit includes voltage transformer pt, resistance R4, resistance R5；Alternating current sample circuit includes Current Transmit, resistance R6；
After first side winding series resistance R4 of voltage transformer pt in parallel with output AC voltage, secondary side winding is in parallel with resistance R5, secondary side winding one end ground connection after parallel connection, one end is connected with the Vin end measuring chip of measuring circuit (5), the first side winding series connection incoming transport outlet side of Current Transmit, secondary side winding is in parallel with resistance R6, the secondary side winding one end ground connection after parallel connection, and one end is connected with the Iin end measuring chip.
DC-AC changer measurement apparatus the most according to claim 3, it is characterised in that: the employing STC12C5A60S2 model single-chip microcomputer of described single-chip microcomputer (2), the measurement chip of described measuring circuit (5) uses CS5460A.
DC-AC changer measurement apparatus the most according to claim 1, it is characterised in that: described reference cell (9) uses reference voltage chip LM1117.
DC-AC changer measurement apparatus the most according to claim 1, it is characterised in that: described key-press module (7) is made up of three buttons, be respectively "+", "-", " function selecting "；
Described relay (6) is made up of relay coil KM2 and relay normally-closed contact KM1, and relay coil KM2 one end is connected with single-chip microcomputer (2), other end ground connection, and relay normally-closed contact KM1 is connected on the positive pole of DC supply input；
Described temperature protection circuit (10) is made up of resistance R7 and critesistor R8, and resistance R7 one end is connected with VCC, and resistance R7 connects with critesistor R8, and series connection point is connected with the AD4 mouth of single-chip microcomputer (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620140893.4U CN205581185U (en) | 2016-02-25 | 2016-02-25 | DC -AC converter measuring device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620140893.4U CN205581185U (en) | 2016-02-25 | 2016-02-25 | DC -AC converter measuring device |
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| CN205581185U true CN205581185U (en) | 2016-09-14 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107992147A (en) * | 2017-12-18 | 2018-05-04 | 中国电子科技集团公司第四十七研究所 | A kind of programmable multiple exports digital power |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107992147A (en) * | 2017-12-18 | 2018-05-04 | 中国电子科技集团公司第四十七研究所 | A kind of programmable multiple exports digital power |
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