CN205594040U - Ampere meter protection circuit - Google Patents
Ampere meter protection circuit Download PDFInfo
- Publication number
- CN205594040U CN205594040U CN201620282228.9U CN201620282228U CN205594040U CN 205594040 U CN205594040 U CN 205594040U CN 201620282228 U CN201620282228 U CN 201620282228U CN 205594040 U CN205594040 U CN 205594040U
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- CN
- China
- Prior art keywords
- resistor
- relay
- ammeter
- capacitor
- switch element
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model relates to a protection circuit of ampere meter belongs to the electrical technology field. Include: sample switch circuit, level acquisition circuit, sample switch circuit includes first resistance, the vehicle charging control system further comprises a second resistor, the switch element, bee calling organ, the normally open contact of the rela, first resistor, first jack and plug connector one end are connected respectively to first resistor one end, the first contact of relay is connected to the first resistor other end, the plug connector other end is connected with second resistor one end, the second resistor other end is connected with the switch element control end, switch element output ground connection, bee calling organ one end is connected to the switch element input, the bee calling organ other end is connected, relay coil one end is connected, relay other end linked switch component input, relay second contact junction current table input. Having increased the reliability of equipment, having improved system security nature, the cost is reduced has the safety warning device, and the more effective elimination equipment trouble of ability guarantees safety personal and equipment.
Description
Technical field
This utility model relates to the protection circuit of a kind of ammeter, belongs to technical field of electricity.
Background technology
In Verifying Experiment, circuit voltage, typically not over 24V, safe to the human body would not cause shadow mutually
Ring, but the protection to device and instrument and meter is the most particularly important.In experimentation, it is often necessary to the electric current of measuring circuit, due to
Operational error often makes electric current exceed the range of ammeter, causes the damage of ammeter, makes circuit arrangement maintenance cost significantly
Raise.Common protection circuit is typically carried out in terms of pressure limiting and current limliting two, but they have a common feature, it is simply that be
Altogether with an earth potential.When claimed circuit is unrelated with operating circuit, these methods are the most no longer valid.And when circuit is extensive
Time the most normal, protection circuit can not be automatically stopped work.
Utility model content
For solving above-mentioned technical problem, this utility model provides a kind of ammeter protection circuit, adopts the following technical scheme that
A kind of ammeter protection circuit, including:
Sampling switch circuit, obtains beyond voltage during ammeter range；Disconnected when measuring when electric current exceedes ammeter range
Open measurement electric current, and report to the police；When measuring electric current less than ammeter range, connect and measure electric current；
Level Acquisition Circuit, gathers the working condition of protection circuit；Sampling switch circuit includes the first resistance, the second electricity
Resistance, switch element, buzzer, relay, the first resistance, first resistance one end connects the first jack and plug connector one end respectively,
The first resistance other end connects the first contact of relay, the plug connector other end and second resistance one end and connects, and the second resistance is another
One end controls end with switch element and is connected, switch element output head grounding, and switch element input connects buzzer one end, buzzing
The device other end connects power supply, and relay coil one end connects power supply, relay other end connecting valve cell input, relay
Second contact connects ammeter input.
Use this utility model of technique scheme compared with prior art, provide the benefit that:
Applied widely, can install according to equipment and service condition is arranged flexibly, add the reliability of equipment, carry
The high safety of system, reduces cost, has safety alarm device, can more effective abatement apparatus fault, it is ensured that the person
Safety with equipment.
Further, prioritization scheme of the present utility model is:
Described switch element is quasiconductor.
Described quasiconductor is transistor.
Described switch element is audion, and the base stage of audion connects the second resistance, and colelctor electrode connects buzzer, emitter stage
Ground connection.
Described level Acquisition Circuit includes single-chip microcomputer, crystal oscillator, the first electric capacity, the second electric capacity, the 3rd electric capacity, the 3rd resistance,
18th foot of single-chip microcomputer connects sampling switch circuit transistor collector, and the 28th foot connects power supply, and the 6th, connect crystalline substance between 7 feet
Shaking, crystal oscillator two ends connect the second electric capacity, the 3rd electric capacity respectively, and the second electric capacity, the 3rd electric capacity other end ground connection respectively, the 3rd foot divides
Not being connected with the first electric capacity, the 3rd resistance, the first electric capacity other end connects power supply, and the 3rd resistance other end connects ground, the 14th foot
Connect ground.
Accompanying drawing explanation
Fig. 1 is sampling protection circuit figure of the present utility model.
Fig. 2 is level Acquisition Circuit figure of the present utility model.
In figure: the first resistance R1d；Second resistance R2d；3rd resistance Rs；Audion Q8；Buzzer LS1d；Relay
RL1d；Crystal oscillator Y2；First electric capacity C3；Second electric capacity C4；3rd electric capacity C5；Single-chip microcomputer U12；Ammeter M；First jack u1；The
Two jack u2；Plug connector P1, the first contact 7；Second contact 6.
Detailed description of the invention
The present embodiment includes sampling switch circuit, level Acquisition Circuit, and sampling switch circuit, when obtaining ammeter overcurrent
Voltage；Measure electric current when measuring to disconnect when electric current exceedes ammeter range, and report to the police；When measuring electric current less than ammeter range
Time, connect and measure electric current；Level Acquisition Circuit, gathers the working condition of protection circuit；Sampling switch circuit includes the first resistance
R1d, the second resistance R2d, audion Q8, buzzer LS1d, relay R L1d, one end of plug connector P1, the first resistance R1d is respectively
Connecting the first jack u1 and plug connector P1 one end, the first resistance R1d other end connects the first contact 7 of relay R L1d；Grafting
The part P1 other end and second resistance R2d one end connect, and the second resistance R2 other end is connected with audion Q8 base stage, and audion Q8 sends out
Emitter grounding, audion Q8 colelctor electrode connects buzzer LS1d one end, and the buzzer LS1d other end connects power supply, relay R L1d
Coil one end connects power supply, relay R L1d other end connecting triode Q8 colelctor electrode, and relay R L1d the second contact connects electricity
Stream table M input.
Level Acquisition Circuit includes single-chip microcomputer U12, crystal oscillator Y2, the first capacitor C3, the second capacitor C4, the 3rd capacitor
18th foot of C5, the 3rd resistor Rs, single-chip microcomputer U12 connects sampling switch circuit audion Q8 colelctor electrode, and the 28th foot connects electricity
Source, the 6th, connect crystal oscillator Y2, crystal oscillator Y2 two ends between 7 feet and connect the second capacitor C4, the 3rd capacitor C5, the second electric capacity respectively
Device C4, the 3rd capacitor C5 other end ground connection respectively, the 3rd foot is connected with the first capacitor C3, the 3rd resistor Rs respectively, and first
The capacitor C3 other end connects power supply, the 3rd resistor Rs other end ground connection, the 14th foot ground connection.
The present embodiment ammeter to be protected M uses high accuracy five, and numerical monitor, digital display surpasses the milliampere electric current of four and half
Table.Its range is 0-3.0000A, and five red LED lamp show, the most succinctly.Ammeter M minimum refresh per second 3 times, quite
In real-time measuring data.The maximum error of ammeter is within 1.7mA (within nominal error 0.5mA), and error is little.Supply voltage
Being chosen to be 5V, operating temperature, at-10 DEG C ~ 65 DEG C, meets the working condition of experiment.Ammeter M both can use insulating power supply,
Can power with system power supply altogether again.Because components and parts to be connected after ammeter, therefore insulating power supply is used to power.
The present embodiment operationally, when electric current flows into from the first jack u1, from second jack u2 flow out time, if electric current is big
In 3A, the first resistor R1 both end voltage conducting voltage more than audion Q8, audion Q8 turns on, and relay R L1d coil obtains
Electricity, disconnects the circuit between relay R L1d the first contact 7 and the second contact 6, makes ammeter M value back to zero, buzzer simultaneously
LS1d reports to the police；When electric current is less than 3A, audion Q8, by, relay R L1d coil losing electricity, connects relay R L1d first and touches
Circuit between point 7 and the second contact 6, ammeter M measures current turns ON, automatically recovers to measure work.
Level Acquisition Circuit, is made up of single-chip microcomputer U12 minimum system, when sampling protection circuit work, and the 18th foot
Cxinhao position is become low level from high level, can be collected by single-chip microcomputer U12, conveniently do follow-up work, such as record short circuit
Number of times etc..
The foregoing is only the embodiment that this utility model is the most feasible, not thereby limit to power of the present utility model
Profit scope, the equivalent structure change that all utilization this utility model description and accompanying drawing content are made, it is both contained in this utility model
Interest field within.
Claims (5)
1. an ammeter protection circuit, including: sampling switch circuit, obtain beyond voltage during ammeter range；Work as measurement
Electric current disconnects when exceeding ammeter range measures electric current, and reports to the police；When measuring electric current less than ammeter range, connect and measure electricity
Stream；Level Acquisition Circuit, gathers the working condition of sampling protection circuit；
It is characterized in that: sampling switch circuit includes the first resistor (R1d), the second resistor (R2d), switch element (Q8),
Buzzer (LS1d), relay (RL1d), one end of the first resistor (R1d) connects the first jack (u1) and plug connector respectively
(P1) one end, the first resistance (R1d) other end connects first contact (7) of relay (RL1d)；Plug connector (P1) other end with
Second resistor (R2d) one end connects, and the second resistor (R2) other end controls end with switch element (Q8) and is connected, switch element
(Q8) output head grounding, switch element (Q8) input connects buzzer (LS1d) one end, and buzzer (LS1d) other end connects
Power supply, relay (RL1d) coil one end connects power supply, relay other end connecting valve element (Q8) input, relay
(RL1d) the second contact (6) connect ammeter (M) input.
Ammeter protection circuit the most according to claim 1, it is characterised in that: described switch element (Q8) is quasiconductor.
Ammeter protection circuit the most according to claim 2, it is characterised in that: described quasiconductor is transistor.
Ammeter protection circuit the most according to claim 3, it is characterised in that: described transistor is audion, audion
Base stage connect resistance (R2d), colelctor electrode connect buzzer (LS1d), grounded emitter.
Ammeter protection circuit the most according to claim 1, it is characterised in that: described level Acquisition Circuit includes single-chip microcomputer
(U12), crystal oscillator (Y2), the first capacitor (C3), the second capacitor (C4), the 3rd capacitor (C5), the 3rd resistor (Rs), single
18th foot of sheet machine (U12) connects sampling switch circuit audion (Q8) colelctor electrode, and the 28th foot connects power supply, and the 6th, between 7 feet
Connecting crystal oscillator (Y2), crystal oscillator (Y2) two ends connect the second capacitor (C4), the 3rd capacitor (C5), the second capacitor respectively
(C4), the 3rd capacitor (5) other end connect ground connection respectively, the 3rd foot respectively with the first capacitor (C3), the 3rd resistor (Rs)
Connecting, the first capacitor (C3) other end connects power supply, and the 3rd resistor (Rs) other end connects ground, and the 14th foot connects ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620282228.9U CN205594040U (en) | 2016-04-07 | 2016-04-07 | Ampere meter protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620282228.9U CN205594040U (en) | 2016-04-07 | 2016-04-07 | Ampere meter protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205594040U true CN205594040U (en) | 2016-09-21 |
Family
ID=56922707
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620282228.9U Expired - Fee Related CN205594040U (en) | 2016-04-07 | 2016-04-07 | Ampere meter protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205594040U (en) |
-
2016
- 2016-04-07 CN CN201620282228.9U patent/CN205594040U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160921 Termination date: 20180407 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |