CN114441846A - High-precision voltage detection control circuit - Google Patents
High-precision voltage detection control circuit Download PDFInfo
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- CN114441846A CN114441846A CN202210129627.1A CN202210129627A CN114441846A CN 114441846 A CN114441846 A CN 114441846A CN 202210129627 A CN202210129627 A CN 202210129627A CN 114441846 A CN114441846 A CN 114441846A
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- 238000001514 detection method Methods 0.000 title claims abstract description 23
- 238000006243 chemical reaction Methods 0.000 claims abstract description 26
- 230000002093 peripheral effect Effects 0.000 claims abstract description 5
- 239000003990 capacitor Substances 0.000 claims description 21
- 102100039435 C-X-C motif chemokine 17 Human genes 0.000 claims description 6
- 101000889048 Homo sapiens C-X-C motif chemokine 17 Proteins 0.000 claims description 6
- 230000005611 electricity Effects 0.000 claims description 4
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 230000002457 bidirectional effect Effects 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 5
- 238000012544 monitoring process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 208000033999 Device damage Diseases 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 239000013642 negative control Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/2503—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques for measuring voltage only, e.g. digital volt meters (DVM's)
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/20—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for electronic equipment
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Control Of Voltage And Current In General (AREA)
Abstract
The invention discloses a high-precision voltage detection control circuit in the technical field of voltage detection, which comprises a power supply module, an AD conversion module, a CPU control module and a voltage control module, wherein the power supply module is electrically connected with the AD conversion module, the AD conversion module is in bidirectional signal connection with the CPU control module, the CPU control module is in bidirectional signal connection with the voltage control module, the voltage control module is connected with an external protected circuit, the AD conversion module adopts a 12-bit ADS7886 chip and a matching circuit, the voltage input end of the ADS7886 chip is electrically connected with an analog voltage acquisition circuit, the voltage control module comprises a control circuit, the voltage detection circuit is combined with a PMOS tube high-voltage end control circuit, the on-off of the circuit can be controlled, the normal state of a rear-end circuit is protected, and meanwhile, all devices are low in cost and can be prevented from damaging the peripheral equipment with higher price; the applicability is strong, and most low-voltage direct current circuits can be applied; the portability is strong, and the circuit can be adapted without being basically changed.
Description
Technical Field
The invention relates to the technical field of voltage detection, in particular to a high-precision voltage detection control circuit.
Background
For many industrial automation control system circuits, the input voltage limit born by the industrial automation control system circuits is provided, and if the industrial automation control system circuits work beyond the limit for a long time, the circuits are likely to be damaged, and electrical equipment can also be damaged. Therefore, the accurate detection of the voltage plays an important role in many industrial control fields. The AD conversion chip is generally only used to prior art scheme, increases the resistance of high accuracy at the power entrance of whole circuit board, through the voltage of gathering high accuracy resistance both ends, can monitor the consumption of whole board through calculating, as shown in figure 1, specifically do: the high-precision voltage detection control circuit is characterized in that a high-precision resistor is connected into the power inlet of the whole board in series, the resistance value is R, certain voltage drop is generated after voltage passes through the resistor R, the voltage drop U is collected through an AD conversion chip, and the power consumption P of the mainboard is calculated to be U2/R.
Disclosure of Invention
The present invention is directed to provide a high-precision voltage detection control circuit, so as to solve the problem of the prior art that a voltage detection control circuit with a protection mechanism is urgently needed to be designed in real life.
In order to achieve the purpose, the invention provides the following technical scheme: high accuracy voltage detection control circuit, including power supply module, AD conversion module, CPU control module and voltage control module, AD conversion module is connected to the power supply module electricity, AD conversion module two-way signal connection CPU control module, CPU control module two-way signal connection voltage control module, voltage control module is connected with peripheral hardware by the protection circuit, power supply module adopts the steady voltage source, AD conversion module adopts 12 ADS7886 chips and supporting circuit, the voltage input electricity of ADS7886 chip is connected with analog voltage acquisition circuit, pass through IIC bus connection between AD conversion module and the CPU control module, voltage control module is including control circuit.
Preferably, the control chip of the voltage-stabilizing source is an LDO power supply chip.
Preferably, the IIC bus interface is connected with a pull-up resistor.
Preferably, the control circuit includes an IO port connected to the CPU control module, the IO port is connected in parallel to resistors R1 and R2, the other end of the resistor R1 is connected in series to a VCC terminal, the other end of the resistor R2 is connected in parallel to a base of a capacitor C1, a resistor R3 and an NPN triode Q1, the other end of the capacitor C1 and the other end of the resistor R3 and an emitter of the NPN triode Q1 are grounded, a collector of the NPN triode Q1 is connected in series to a resistor R4, the other end of the resistor R4 is connected in parallel to a resistor R5 and a gate of a PMOS transistor Q2, the other end of the resistor R5 and a drain of the PMOS transistor Q2 are connected to a VCC1 terminal, a source of the PMOS transistor Q2 is connected in parallel to capacitors C2, C3 and a VCC2 terminal, and the other ends of the capacitors C2 and C3 are grounded.
Preferably, the analog voltage acquisition circuit comprises a resistor R6 and a resistor R7 connected with a VIN port of an ADS7886 chip, the other end of the resistor R6 is connected with the voltage acquisition port, the other end of the resistor R7 is connected with a GND port of the ADS7886 chip, a capacitor C4, a capacitor C5, a ground line and a resistor R8, the other end of the resistor R8 is connected with a CS # port of the ADS7886 chip, and the other ends of the capacitors C4 and C5 are connected with a VDD port of the ADS7886 chip.
Preferably, the 12-bit ADS7886 chip and the supporting circuit can be replaced by a 16-bit AD7705 chip and a supporting circuit.
Compared with the prior art, the invention has the beneficial effects that: the voltage detection circuit is combined with the PMOS tube high-voltage end control circuit, so that the on-off of the circuit can be controlled, the normal state of a rear end circuit can be protected, and meanwhile, all devices are low in cost and can prevent peripheral equipment with higher price from being damaged; the applicability is strong, and most low-voltage direct-current circuits can be applicable; the portability is strong, and the circuit can be adapted without being basically changed.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a prior art schematic;
FIG. 2 is a schematic diagram of the circuit of the present invention;
FIG. 3 is a schematic control diagram of the AD conversion module, the CPU control module and the voltage control module shown in FIG. 2;
FIG. 4 is a diagram of the control circuit of FIG. 3;
FIG. 5 is a circuit diagram of the analog voltage acquisition of the present invention;
fig. 6 is a diagram of fig. 4 showing an electric connection in use.
In the drawings, the components represented by the respective reference numerals are listed below:
the system comprises a power supply module 1, a 2-AD conversion module, a 3-CPU control module, a 4-voltage control module and a 5-peripheral protected circuit.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Example one
Referring to fig. 2-3, the present invention provides a technical solution: a high-precision voltage detection control circuit comprises a power supply module 1, an AD conversion module 2, a CPU control module 3 and a voltage control module 4, wherein the power supply module 1 is electrically connected with the AD conversion module 2, the AD conversion module 2 is in bidirectional signal connection with the CPU control module 3, the CPU control module 3 is in bidirectional signal connection with the voltage control module 4, the voltage control module 4 is connected with an external protected circuit 5, the power supply module 1 adopts a voltage stabilizing source, wherein the control chip of the voltage stabilizing source adopts an LDO power chip to provide stable power supply for the AD conversion module 2, meanwhile, the AD conversion module 2 adopts a 12-bit ADS7886 chip and a matching circuit, the highest voltage detection precision of 0.8mV can be realized, the voltage of the precision can protect almost any integrated circuit and module from being damaged, the voltage input end of the ADS7886 chip is electrically connected with an analog voltage acquisition circuit, and the AD conversion module 2 is connected with the CPU control module 3 through an IIC bus, the CPU control module 3 is used for collecting IIC bus signals, the voltage control module 4 is controlled through IO, an IIC bus interface is connected with a pull-up resistor, the voltage control module 4 comprises a control circuit, an NPN triode Q1 and a PMOS tube Q2 are integrated, and the on-off of the circuit can be controlled at a high voltage end; the AD conversion chip of realization process accessible high accuracy will be gathered by monitoring voltage, surpasss safe voltage when the voltage range, then cuts off supply voltage through on-off control circuit, prevents to be burnt out by protection circuit, realizes voltage monitoring and on-off control to certain partial circuit, prevents to be surpassed the maximum limit by protection device voltage, during the use: the power supply voltage of the ADS7886 chip is 2.35-5.25V, when the collected voltage is higher than the power supply voltage, the collected voltage can be collected after being divided by the resistors, and then the collected voltage is calculated.
Referring to fig. 4, the control circuit includes an IO port connected to the CPU control module 3, the IO port is connected in parallel to resistors R1 and R2, the other end of the resistor R1 is connected in series to a VCC terminal, the other end of the resistor R2 is connected in parallel to a capacitor C1, a resistor R3, and a base of an NPN transistor Q1, the capacitor C1 and the other end of the resistor R3 are grounded to an emitter of the NPN transistor Q1, a collector of the NPN transistor Q1 is connected in series to a resistor R4, the other end of the resistor R4 is connected in parallel to gates of the resistor R5 and a PMOS transistor Q2, the other end of the resistor R5 and a drain of the PMOS transistor Q2 are connected to a VCC1 terminal, a source of the PMOS transistor Q2 is connected to terminals of capacitors C2, C3, and VCC2, and the other ends of the capacitors C2 and C3 are grounded, specifically: the control circuit adopts a PMOS tube Q2 and an NPN triode Q1, the power supply can be cut off at the positive voltage end, the rear end circuit is protected, compared with the negative control voltage end of an NMOS tube, the PMOS tube control circuit can ensure that all devices are not electrified after the voltage is cut off, wherein an IO port is a control port of the CPU control module 3, when the IO port outputs high level, the NPN triode Q1 can be conducted, at the moment, the grid electrode and the source electrode of the PMOS tube Q2 generate voltage difference, the VCC1 end and the VCC2 end are conducted, and at the moment, power is supplied to the load end; when the IO outputs a low level, the NPN triode Q1 is turned off, no voltage difference is generated between the gate and the source of the PMOS transistor Q2 at this time, the VCC1 terminal and the VCC2 terminal are not turned on, the VCC2 terminal voltage is 0 at this time, and no power supply voltage is provided at the load terminal;
when the CPU control module 3 detects that the voltage value of the load end exceeds the tolerable range through the IIC bus, the low level is output through IO, and the VCC1 end and the VCC2 end are disconnected through the NPN transistor Q1 and the PMOS transistor Q2, so as to protect devices of the rear-end load circuit from being damaged in time.
Referring to fig. 5, the analog voltage acquisition circuit includes resistors R6 and R7 connected to the VIN port of the ADS7886 chip, the other end of the resistor R6 is connected to the voltage acquisition port, the other end of the resistor R7 is connected to the GND port of the ADS7886 chip, a capacitor C4, a capacitor C5, a ground line, and a resistor R8, the other end of the resistor R8 is connected to the CS # port of the ADS7886 chip, and the other ends of the capacitors C4 and C5 are connected to the VDD port of the ADS7886 chip.
The working principle is as follows: the high-precision voltage monitoring and PMOS tube voltage control circuit are integrated, the voltage can be monitored and the on-off of the voltage can be controlled in time, and the damage of devices caused by abnormal voltage can be prevented, as shown in FIG. 6, the scheme is applied to an A7 framework mainboard, digital signals of an ADS7886 chip are collected through an IIC interface of an A7 main chip, the voltage is calculated, and the peripheral 5V module is monitored and controlled in the on-off mode; supply voltage is 3.3V for AD conversion module 2, the precision of gathering voltage can reach 0.8mV, it gives ADS7886 chip through two 10K resistance R6 and R7 partial pressure to gather the voltage, because the supply voltage scope of external module is 4.75 ~ 5.25V, detect the scope that gathers voltage and exceed 2.375 ~ 2.625V promptly as main control chip, promptly through control circuit, to the module outage, prevent the device damage, GPIO interface through CPU control module 3, the 5V voltage power supply of external module is controlled.
Example two
Referring to fig. 2-5, the 12-bit ADS7886 chip and the supporting circuit in the high-precision voltage detection control circuit of the invention can be replaced by a 16-bit AD7705 chip and a supporting circuit, which can meet the requirement of higher-precision voltage detection.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (6)
1. High accuracy voltage detection control circuit, including power supply module (1), AD conversion module (2), CPU control module (3) and voltage control module (4), its characterized in that: AD conversion module (2) is connected to power supply module (1) electricity, AD conversion module (2) two-way signal connection CPU control module (3), CPU control module (3) two-way signal connection voltage control module (4), voltage control module (4) are connected with peripheral hardware protected circuit (5), power supply module (1) adopts the steady voltage source, AD conversion module (2) adopt 12 ADS7886 chips and supporting circuit, the voltage input electricity of ADS7886 chip is connected with analog voltage acquisition circuit, pass through IIC bus connection between AD conversion module (2) and CPU control module (3), voltage control module (4) are including control circuit.
2. The high-precision voltage detection control circuit according to claim 1, characterized in that: and the control chip of the voltage stabilizing source is an LDO power supply chip.
3. The high-precision voltage detection control circuit according to claim 1, characterized in that: and the IIC bus interface is connected with a pull-up resistor.
4. The high-precision voltage detection control circuit according to claim 1, characterized in that: the control circuit comprises an IO port connected with a CPU control module (3), the IO port is connected with a resistor R1 and a resistor R2 in parallel, the other end of the resistor R1 is connected with a VCC end in series, the other end of the resistor R2 is connected with a base of a capacitor C1, a resistor R3 and an NPN triode Q1 in parallel, the other end of the capacitor C1 and the other end of the resistor R3 are grounded with an emitter of the NPN triode Q1, a collector of the NPN triode Q1 is connected with a resistor R4 in series, the other end of the resistor R4 is connected with a gate of a resistor R5 and a gate of a PMOS transistor Q2 in parallel, the other end of the resistor R5 and a drain of the PMOS transistor Q2 are connected with a VCC1 end, a source of the PMOS transistor Q2 is connected with ends of a capacitor C2, a C3 and a VCC2 in parallel, and the other ends of the capacitors C2 and the C3 are grounded.
5. The high-precision voltage detection control circuit according to claim 1, characterized in that: the analog voltage acquisition circuit comprises a resistor R6 and a resistor R7 which are connected with a VIN port of an ADS7886 chip, the other end of the resistor R6 is connected with a voltage acquisition port, the other end of the resistor R7 is connected with a GND port, a capacitor C4, a capacitor C5, a ground wire and a resistor R8 of the ADS7886 chip, the other end of the resistor R8 is connected with a CS # port of the ADS7886 chip, and the other ends of the capacitors C4 and C5 are connected with a VDD port of the ADS7886 chip.
6. The high-precision voltage detection control circuit according to claim 1, characterized in that: the 12-bit ADS7886 chip and the supporting circuit can be replaced by a 16-bit AD7705 chip and a supporting circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210129627.1A CN114441846A (en) | 2022-02-11 | 2022-02-11 | High-precision voltage detection control circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210129627.1A CN114441846A (en) | 2022-02-11 | 2022-02-11 | High-precision voltage detection control circuit |
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| CN114441846A true CN114441846A (en) | 2022-05-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210129627.1A Pending CN114441846A (en) | 2022-02-11 | 2022-02-11 | High-precision voltage detection control circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115566786A (en) * | 2022-10-24 | 2023-01-03 | 福建顺昌虹润精密仪器有限公司 | Hand-held type low-power consumption humiture detector |
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2022
- 2022-02-11 CN CN202210129627.1A patent/CN114441846A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115566786A (en) * | 2022-10-24 | 2023-01-03 | 福建顺昌虹润精密仪器有限公司 | Hand-held type low-power consumption humiture detector |
| CN115566786B (en) * | 2022-10-24 | 2023-08-18 | 福建顺昌虹润精密仪器有限公司 | Handheld low-power-consumption temperature and humidity detector |
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