CN204882845U - But control circuit of set voltage reference source penalty coefficient voltmeter - Google Patents

But control circuit of set voltage reference source penalty coefficient voltmeter Download PDF

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Publication number
CN204882845U
CN204882845U CN201520405778.0U CN201520405778U CN204882845U CN 204882845 U CN204882845 U CN 204882845U CN 201520405778 U CN201520405778 U CN 201520405778U CN 204882845 U CN204882845 U CN 204882845U
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China
Prior art keywords
pin
module
voltage
resistance
control module
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Expired - Fee Related
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CN201520405778.0U
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Chinese (zh)
Inventor
罗映
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Shandong paimon Electromechanical Technology Co Ltd
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Jinan Inno Electronic Technology Co Ltd
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Priority to CN201520405778.0U priority Critical patent/CN204882845U/en
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Abstract

The utility model provides a but control circuit of set voltage reference source penalty coefficient voltmeter, including MCU host system, characterized by: MCU host system connects reference voltage module, serial ports debugging module, partial pressure module, LED and master control button module, power module and charactron control module respectively, MCU host system uses STC12C2052AD as control core. Can be according to actual conditions ( measurement chip's the measuring error or the factors such as error of resistance capacitance) set voltage reference source penalty coefficient and divider resistance network penalty coefficient when measuring, can the effectual collection precision that improves the voltmeter, partial pressure module adopts resistance (1%) bleeder circuit to realize the increase and measures the range, power module can avoid use the time because of connecing wrong voltage to lead to whole voltmeter circuit to burn out, charactron control module, out of use exclusion, but use the resistance of 8 separations, directly use the drive of singlechip pin, can drive the charactron completely, can reduce the cost of whole device under the condition of guaranteeing system stability.

Description

A kind of control circuit that voltage-reference penalty coefficient voltage table is set
Technical field
The utility model relates to electronic instrumentation, specifically, relates to a kind of control circuit arranging voltage-reference penalty coefficient voltage table.
Background technology
At present when measuring voltage, what generally adopt is that voltage table or multimeter are measured.Existing equipment is when the voltage of metering circuit point-to-point transmission, this is because the internal resistance of instrument needs current sinking, cause measurement result mistake, in addition, also may because the systematic error of itself affects when the error of voltage table internal circuit components and parts used own or voltage table dispatch from the factory, can cause in actual measurement process, error deviation value can be bigger than normal than actual value.Therefore, in the urgent need to a kind of control circuit arranging voltage-reference penalty coefficient voltage table.
Summary of the invention
The technical problems to be solved in the utility model is to provide a kind of control circuit arranging voltage-reference penalty coefficient voltage table, complete function, and measuring accuracy is high, and measure simple and convenient, cost is low.
The utility model adopts following technological means to realize goal of the invention:
A kind of control circuit that voltage-reference penalty coefficient voltage table is set, comprise MCU main control module, it is characterized in that: described MCU main control module connects reference voltage module, AccessPort module, division module, LED and master control key-press module, power module and charactron control module respectively, described MCU main control module take STC12C2052AD as control core.
As the further restriction to the technical program, described charactron control module directly uses single-chip microcomputer pin to drive, charactron can be driven completely, input pin SMG_COM1, SMG_COM2, SMG_COM3 of described charactron control module and SMG_COM4 are connected with the pin 19 of MCU main control module, pin 20, pin 1 and pin 2 respectively, and the output 8 pass pin a ~ dp of described charactron control module pin P3.0 ~ P3.7 that resistance in series R1 ~ R8 connects MCU main control module respectively connects.
As the further restriction to the technical program, described reference voltage module adopts TL431 chip, the pin A ground connection of described TL431 chip, the pin R series resistor R10 of described TL431 chip is connected to VCC, its parallel branch series capacitance C2 is connected to ground, the pin K serial capacitance C3 of described TL431 chip is connected to GND, the pin VOL_BASE of described reference voltage module connects the pin 3 of MCU main control module, reference source circuit C3 adopts 68pf, and when can solve calculating, spread of voltage asks and problem that numerical value difference is also larger.
As the further restriction to the technical program, described division module adopts the duplicate bleeder circuit of two covers, then do difference and then complete the measurement of magnitude of voltage after gathering with two-way ADC, measurement pin VOL_IN1 and the measurement pin VOL_IN2 of described division module are connected pin 3 and the pin 2 of power module socket respectively, data pin VOL_MEA1 and the data pin VOL_MEA2 of described division module are connected pin 4 and the pin 5 of MCU main control module respectively, described bleeder circuit is measured pin VOL_IN1 resistance in series R11 and resistance R12 and is connected to data pin VOL_MEA1, the parallel branch resistance in series R13 of resistance R12 and electric capacity C5, wherein resistance in series R13 and electric capacity C5 indirectly, described bleeder circuit is measured pin VOL_IN2 resistance in series R14 and resistance R15 and is connected to data pin VOL_MEA2, the parallel branch resistance in series R17 of resistance R15 and electric capacity C6, wherein resistance in series R17 and electric capacity C6 indirectly.
As the further restriction to the technical program, described power module adopts chip AMS1117-5.0, the pin 1 series resistor R6 of described chip AMS1117-5.0 and pilot lamp D1 is connected to pin 2, the pin 2 of described chip AMS1117-5.0 is connected in series in VCC with the pin 4 of chip AMS1117-5.0, the pin 3 of described chip AMS1117-5.0 connects the pin 4 that described diode Diode is connected to socket CON1, the pin 4 serial capacitance C1 of described socket CON1 connects the pin 3 of chip AMS1117-5.0, the two-way TVS pipe that power unit increases a 15V can be avoided when measuring because some high pressure cause the problem of single chip microcomputer halt.
As the further restriction to the technical program, pin 2 and the pin 3 of described AccessPort module are connected pin P3.0 and the pin P3.1 of described MCU main control module respectively, the pin 1 of described AccessPort module is connected VCC and GND respectively with pin 4, and described AccessPort module can facilitate staff to debug voltage table.
As the further restriction to the technical program, described LED is connected the pin 7 of described MCU main control module with the pin KEY of master control key-press module, and described LED is connected the pin 9 of described MCU main control module with the pin LED of master control key-press module.
Compared with prior art, advantage of the present utility model and good effect are: the utility model can arrange voltage-reference penalty coefficient and resistor voltage divider network penalty coefficient according to actual conditions (measuring the factor such as the measuring error of chip or the error of resistance capacitance) by master control button in measurement, effectively can improve the acquisition precision of voltage table; Division module adopts resistance (1%) bleeder circuit to realize increasing measurement range; Power module adds AMS1117 chip as voltage stabilizing, and 1N5824 diode is as reverse connecting protection, and the circuit such as electrochemical capacitor, can avoid use time cause whole voltmeter circuit to be burnt because of wrong voltage; Charactron control module, do not re-use exclusion, but the resistance that use 8 is discrete, bad owing to often easily welding time exclusion welds, and charactron control circuit does not re-use 74HC164, but directly use single-chip microcomputer pin to drive, can charactron be driven completely, the cost of whole device can be reduced under the condition ensureing system stability.
Accompanying drawing explanation
Fig. 1 functional-block diagram of the present utility model.
Fig. 2 is charactron control module circuit diagram.
Fig. 3 is power module circuitry figure.
Fig. 4 is LED and master control key-press module circuit diagram.
Fig. 5 is division module circuit diagram.
Fig. 6 is AccessPort module circuit diagram.
Fig. 7 is reference voltage module circuit diagram.
Fig. 8 is MCU main control module circuit diagram.
Fig. 9 is workflow diagram of the present utility model
Embodiment
Below in conjunction with embodiment, further illustrate the utility model.
See Fig. 1-Fig. 8, the utility model comprises MCU main control module, it is characterized in that: described MCU main control module connects reference voltage module, AccessPort module, division module, LED and master control key-press module, power module and charactron control module respectively, described MCU main control module take STC12C2052AD as control core.
Described charactron control module directly uses single-chip microcomputer pin to drive, charactron can be driven completely, input pin SMG_COM1, SMG_COM2, SMG_COM3 of described charactron control module and SMG_COM4 are connected with the pin 19 of MCU main control module, pin 20, pin 1 and pin 2 respectively, pin P3.0 ~ the P3.7 of output 8 pass pin a ~ dp resistance in series R1 respectively ~ R8 connection MCU main control module of described charactron control module connects, charactron can the magnitude of voltage of display measurement, and precision is 0.01 volt.
Described reference voltage module adopts TL431 chip, the pin A ground connection of described TL431 chip, the pin R series resistor R10 of described TL431 chip is connected to VCC, its parallel branch series capacitance C2 is connected to ground, the pin K serial capacitance C3 of described TL431 chip is connected to GND, the pin VOL_BASE of described reference voltage module connects the pin 3 of MCU main control module, and reference source circuit C3 adopts 68pf, when can solve calculating spread of voltage ask and also numerical value differs also larger problem.
Described division module adopts the duplicate bleeder circuit of two covers, then do difference and then complete the measurement of magnitude of voltage after gathering with two-way ADC, measurement pin VOL_IN1 and the measurement pin VOL_IN2 of described division module are connected pin 3 and the pin 2 of power module socket respectively, data pin VOL_MEA1 and the data pin VOL_MEA2 of described division module are connected pin 4 and the pin 5 of MCU main control module respectively, described bleeder circuit is measured pin VOL_IN1 resistance in series R11 and resistance R12 and is connected to data pin VOL_MEA1, the parallel branch resistance in series R13 of resistance R12 and electric capacity C5, wherein resistance in series R13 and electric capacity C5 indirectly, described bleeder circuit is measured pin VOL_IN2 resistance in series R14 and resistance R15 and is connected to data pin VOL_MEA2, the parallel branch resistance in series R17 of resistance R15 and electric capacity C6, wherein resistance in series R17 and electric capacity C6 indirectly.
Described power module adopts chip AMS1117-5.0, the pin 1 series resistor R6 of described chip AMS1117-5.0 and pilot lamp D1 is connected to pin 2, the pin 2 of described chip AMS1117-5.0 is connected in series in VCC with the pin 4 of chip AMS1117-5.0, the pin 3 of described chip AMS1117-5.0 connects the pin 4 that described diode Diode is connected to socket CON1, the pin 4 serial capacitance C1 of described socket CON1 connects the pin 3 of chip AMS1117-5.0, the two-way TVS pipe that power unit increases a 15V can be avoided when measuring because some high pressure cause the problem of single chip microcomputer halt.
Pin 2 and the pin 3 of described AccessPort module are connected pin P3.0 and the pin P3.1 of described MCU main control module respectively, the pin 1 of described AccessPort module is connected VCC and GND respectively with pin 4, and described AccessPort module can facilitate staff to debug voltage table.
Described LED is connected the pin 7 of described MCU main control module with the pin KEY of master control key-press module, described LED is connected the pin 9 of described MCU main control module with the pin LED of master control key-press module, user arranges voltage-reference penalty coefficient and resistor voltage divider network penalty coefficient by master control button, effectively can improve the acquisition precision of voltage table.
When the control circuit work of voltage-reference penalty coefficient voltage table can be set, tested voltage signal is by the measurement pin input measurement device of division module, owing to owing to technique inevitably there is error (TL431 precision is 0.5%) in each reference source, due to each reference source once after having manufactured, error is determined, difference is done after being gathered by two-way 8 ADC of 12 single-chip microcomputers, therefore make to improve acquisition precision by penalty coefficient, the problem that reference source circuit adopts TL431 chip to solve after STC single-chip microcomputer gathers the voltage of reference source to cause because of spread of voltage the numerical value change that obtains larger, and then ensure that the precision of voltage table image data can reach 0.01V, after the voltage data detecting tested device, MCU control module can by 8 Digital sum pipe displays of quaternity, power module is used to provide the electricity of each components and parts need of work, by the control circuit arranging voltage-reference penalty coefficient voltage table of the present utility model, the magnitude of voltage of related device can be detected easily, by the compensation of signal criterion can be relatively accurate complete inter-related task.
Certainly; above-mentioned explanation is not limitation of the utility model; the utility model is also not limited only to above-mentioned citing, the change that those skilled in the art make in essential scope of the present utility model, remodeling, interpolation or replacement, also belongs to protection domain of the present utility model.

Claims (7)

1. one kind can arrange the control circuit of voltage-reference penalty coefficient voltage table, comprise MCU main control module, it is characterized in that: described MCU main control module connects reference voltage module, AccessPort module, division module, LED and master control key-press module, power module and charactron control module respectively, described MCU main control module take STC12C2052AD as control core.
2. the control circuit that voltage-reference penalty coefficient voltage table is set according to claim 1, it is characterized in that: described charactron control module directly uses single-chip microcomputer pin to drive, charactron can be driven completely, input pin SMG_COM1, SMG_COM2, SMG_COM3 of described charactron control module and SMG_COM4 are connected with the pin 19 of MCU main control module, pin 20, pin 1 and pin 2 respectively, and the output 8 pass pin a ~ dp of described charactron control module pin P3.0 ~ P3.7 that resistance in series R1 ~ R8 connects MCU main control module respectively connects.
3. the control circuit that voltage-reference penalty coefficient voltage table is set according to claim 1, it is characterized in that: described reference voltage module adopts TL431 chip, the pin A ground connection of described TL431 chip, the pin R series resistor R10 of described TL431 chip is connected to VCC, its parallel branch series capacitance C2 is connected to ground, the pin K serial capacitance C3 of described TL431 chip is connected to GND, the pin VOL_BASE of described reference voltage module connects the pin 3 of MCU main control module, reference source circuit C3 adopts 68pf, when can solve calculating, spread of voltage asks and problem that numerical value difference is also larger.
4. the control circuit that voltage-reference penalty coefficient voltage table is set according to claim 1, it is characterized in that: described division module adopts the duplicate bleeder circuit of two covers, then do difference and then complete the measurement of magnitude of voltage after gathering with two-way ADC, measurement pin VOL_IN1 and the measurement pin VOL_IN2 of described division module are connected pin 3 and the pin 2 of power module socket respectively, data pin VOL_MEA1 and the data pin VOL_MEA2 of described division module are connected pin 4 and the pin 5 of MCU main control module respectively, described bleeder circuit is measured pin VOL_IN1 resistance in series R11 and resistance R12 and is connected to data pin VOL_MEA1, the parallel branch resistance in series R13 of resistance R12 and electric capacity C5, wherein resistance in series R13 and electric capacity C5 indirectly, described bleeder circuit is measured pin VOL_IN2 resistance in series R14 and resistance R15 and is connected to data pin VOL_MEA2, the parallel branch resistance in series R17 of resistance R15 and electric capacity C6, wherein resistance in series R17 and electric capacity C6 indirectly.
5. the control circuit that voltage-reference penalty coefficient voltage table is set according to claim 1, it is characterized in that: described power module adopts chip AMS1117-5.0, the pin 1 series resistor R6 of described chip AMS1117-5.0 and pilot lamp D1 is connected to pin 2, the pin 2 of described chip AMS1117-5.0 is connected in series in VCC with the pin 4 of chip AMS1117-5.0, the pin 3 of described chip AMS1117-5.0 connects the pin 4 that described diode Diode is connected to socket CON1, the pin 4 serial capacitance C1 of described socket CON1 connects the pin 3 of chip AMS1117-5.0, the two-way TVS pipe that power unit increases a 15V can be avoided when measuring because some high pressure cause the problem of single chip microcomputer halt.
6. the control circuit that voltage-reference penalty coefficient voltage table is set according to claim 1, it is characterized in that: pin 2 and the pin 3 of described AccessPort module are connected pin P3.0 and the pin P3.1 of described MCU main control module respectively, the pin 1 of described AccessPort module is connected VCC and GND respectively with pin 4, and described AccessPort module can facilitate staff to debug voltage table.
7. the control circuit that voltage-reference penalty coefficient voltage table is set according to claim 1, it is characterized in that: described LED is connected the pin 7 of described MCU main control module with the pin KEY of master control key-press module, described LED is connected the pin 9 of described MCU main control module with the pin LED of master control key-press module, user arranges voltage-reference penalty coefficient and resistor voltage divider network penalty coefficient by master control button, effectively can improve the acquisition precision of voltage table.
CN201520405778.0U 2015-06-14 2015-06-14 But control circuit of set voltage reference source penalty coefficient voltmeter Expired - Fee Related CN204882845U (en)

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Application Number Priority Date Filing Date Title
CN201520405778.0U CN204882845U (en) 2015-06-14 2015-06-14 But control circuit of set voltage reference source penalty coefficient voltmeter

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Application Number Priority Date Filing Date Title
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110763910A (en) * 2019-11-11 2020-02-07 绵阳市维博电子有限责任公司 Digital display DC meter and current sampling circuit thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110763910A (en) * 2019-11-11 2020-02-07 绵阳市维博电子有限责任公司 Digital display DC meter and current sampling circuit thereof

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Legal Events

Date Code Title Description
C14 Grant of patent or utility model
GR01 Patent grant
TR01 Transfer of patent right
TR01 Transfer of patent right

Effective date of registration: 20180801

Address after: 250101 room 1-618, building 1, 88 West convention Road, Ji'nan, Shandong.

Patentee after: Shandong paimon Electromechanical Technology Co Ltd

Address before: 250000 Phoenix building third, Lingang Development Zone, Licheng District, Ji'nan, Shandong 1501

Patentee before: JINAN INNO ELECTRONIC TECHNOLOGY CO., LTD.

CF01 Termination of patent right due to non-payment of annual fee
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20151216

Termination date: 20190614