CN206832880U - A kind of circuit for testing voltage - Google Patents
A kind of circuit for testing voltage Download PDFInfo
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- CN206832880U CN206832880U CN201720761639.0U CN201720761639U CN206832880U CN 206832880 U CN206832880 U CN 206832880U CN 201720761639 U CN201720761639 U CN 201720761639U CN 206832880 U CN206832880 U CN 206832880U
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- voltage
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Abstract
The utility model is related to a kind of circuit for testing voltage, including one from test lead input electrical connection receive the voltage of its input and be modulated into the bleeder circuit of different output voltages, the voltage indicating circuit that electrically connect analog switching circuit of its output voltage of reception with bleeder circuit, reception its control electric signal sent is electrically connected with analog switching circuit and one end electrically connect with test lead the other end and electrically connect with voltage indicating circuit current-limiting control circuit for controlling stream overvoltage indicating circuit size of current.The circuit uses power supply of the measured voltage as circuit, is not required to be powered with battery, and the value of measurement voltage is shown with LED, can directly find out current voltage scope, easily and effectively.
Description
Technical field
A kind of test circuit is the utility model is related to, more particularly to a kind of circuit for testing voltage.
Background technology
At present, conventional voltage measurement instrument is voltmeter or universal meter.Such instrument and need to use battery powered, volume
Bigger, it is inconvenient to carry.Also the voltmeter of useful LED instructions, row such as, in number of patent application 201520309938.1, use
LED voltage table, the technology disclosed in this patent document have problems with：Using integrated regulator, and multiple phase inverters；
LED is using connected mode in parallel.
2 problems show that the cost of product is higher more than, and LED power consumptions in parallel are larger, and the input impedance of voltmeter
It is small, influence the precision of voltage measurement.
Utility model content
In view of this, the purpose of this utility model is to overcome the deficiencies in the prior art, there is provided a kind of voltage is surveyed
Circuit is tried, the circuit is powered without power supply, and the value of measurement voltage is indicated using LED, and LED is connected with the mode of series connection,
It can be measured from more than ten volts to the voltage of several hectovolts, the electric current for flowing through circuit during measurement only has several milliamperes.
The technical solution of the utility model is as follows：
A kind of circuit for testing voltage, including one with test lead input electrically connect receive its input voltage and be modulated into difference
The bleeder circuit of output voltage, the analog switching circuit and analog switch electricity for receiving its output voltage are electrically connected with bleeder circuit
Road electrical connection receives the voltage indicating circuit of its control electric signal sent and one end electrically connects the other end and voltage with test lead
Indicating circuit electrically connects the current-limiting control circuit for controlling stream overvoltage indicating circuit size of current.
Wherein, the bleeder circuit includes the first divider resistance, the second divider resistance, the 3rd the partial pressure electricity being sequentially connected in series
Resistance, the 4th divider resistance and the 5th divider resistance, the first divider resistance electrically connect with test input, the 5th divider resistance ground connection
End.
Wherein, the voltage indicating circuit includes the first LED, the second LED, the 3rd LED and the being sequentially connected in series
Four LEDs, the anode of each LED is towards unanimously.
Wherein, the analog switching circuit includes the electronic switch of multiple electrical connections；The electronic switch includes the first limit
Piezoresistance, first switch triode, the second pressure limiting resistance, second switch triode, the 3rd pressure limiting resistance, the 3rd three poles of switch
Pipe, the 4th pressure limiting resistance and the 4th switch triode；The end of first pressure limiting resistance one is connected to the first divider resistance and the second partial pressure
Node between resistance, another base stage for being terminated at first switch triode, the colelctor electrode of first switch triode are connected to respectively
The negative electrode and ground terminal of first LED, emitter stage are connected to the anode of the first LED and the colelctor electrode of second switch triode respectively；
The end of second pressure limiting resistance one is connected to the node between the second divider resistance and the 3rd divider resistance, another to be terminated at second switch three
The base stage of pole pipe, the colelctor electrode of second switch triode are connected to the negative electrode of the second LED, and emitter stage is connected to the second LED respectively
Anode and the 3rd switch triode colelctor electrode；The end of 3rd pressure limiting resistance one be connected to the 3rd divider resistance and the 4th divider resistance it
Between node, another base stage for being terminated at the 3rd switch triode, the colelctor electrode of the 3rd switch triode is connected to the 3rd LED
Negative electrode, emitter stage are connected to the anode of the 3rd LED and the colelctor electrode of the 4th switch triode respectively；4th pressure limiting resistance one terminates
Node between the 4th divider resistance and the 5th divider resistance, another base stage for being terminated at the 4th switch triode, the 4th opens
The colelctor electrode for closing triode is connected to the negative electrode of the 4th LED, and emitter stage is connected to the anode of the 4th LED and the hair of triode respectively
Emitter-base bandgap grading.
Wherein, the current-limiting control circuit includes the first current-limiting resistance, the second current-limiting resistance, the triode being sequentially connected electrically
And photo-coupler；The photo-coupler includes light emitting diode and optocoupler triode, and the anode of light emitting diode is connected to the 3rd LED
The negative electrode of lamp, the negative electrode of light emitting diode are connected to the anode of the second LED, and the emitter stage of optocoupler triode is connected to the hair of triode
Emitter-base bandgap grading, the colelctor electrode of optocoupler triode are connected to the base stage of triode；One end of first current-limiting resistance is connected to input, another
The colelctor electrode of triode is terminated at, an end of the second current-limiting resistance is connected to input, another base stage for being terminated at triode.
Wherein, voltage-regulator diode and current limliting electricity are additionally provided between the colelctor electrode of the first switch triode and ground terminal
Resistance.
The utility model has the advantages that：
1st, a kind of circuit for testing voltage of the utility model, by the use of measured voltage as the power supply of circuit, it is not required to
Powered with battery.
2nd, a kind of circuit for testing voltage of the utility model, the value of measurement voltage is shown with LED, can directly find out current voltage
Scope, easily and effectively.
3rd, a kind of circuit for testing voltage of the utility model, circuit is simple, and cost is cheap, suitable for industrialized production, is easy to
Promote.
Brief description of the drawings
Fig. 1 is the utility model circuit theory diagrams；
Fig. 2 is the connection diagram of the utility model analog switching circuit and voltage indicating circuit.
Reference is expressed as in figure：
1- bleeder circuits, the divider resistances of 11- first, the divider resistances of 12- second, the divider resistances of 13- the 3rd, the 4th point of 14-
Piezoresistance, the divider resistances of 15- the 5th, 2- analog switching circuits, 21- electronic switches, the first pressure limitings of 211- resistance, 212- first are opened
Close triode, the second pressure limitings of 213- resistance, 214- second switches triode, the pressure limiting resistance of 215- the 3rd, the switches of 216- the 3rd three
The pressure limiting resistance of pole pipe, 217- the 4th, the switch triodes of 218- the 4th, 3- current-limiting control circuits, the current-limiting resistances of 31- first, 32-
Two current-limiting resistances, 33- triodes, 34- photo-couplers, 341- light emitting diodes, 342- optocouplers triode, 4- voltages instruction electricity
Road, the LEDs of 41- first, the LEDs of 42- second, the LEDs of 43- the 3rd, the LEDs of 44- the 4th, 5- voltage-regulator diodes, 50- current limlitings electricity
Resistance.
Embodiment
The utility model is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Referring to Fig. 1 and Fig. 2, a kind of circuit for testing voltage, including one with test lead input electrically connect receive its input electricity
Press and be modulated into the bleeder circuit 1 of different output voltages, the analog switch electricity for receiving its output voltage is electrically connected with bleeder circuit 1
Road 2, the voltage indicating circuit 4 and one end and test lead for receiving its control electric signal sent are electrically connected with analog switching circuit 2
The electrical connection other end electrically connects the Current limited Control for the size of current of controlling stream overvoltage indicating circuit 4 with voltage indicating circuit 4
Circuit 3.
Further, the bleeder circuit 1 includes being sequentially connected in series the first divider resistance 11, the second divider resistance 12, the
Three divider resistances 13, the 4th divider resistance 14 and the 5th divider resistance 15, the first divider resistance 11 electrically connect with test input,
The earth terminal of 5th divider resistance 15.
Further, the voltage indicating circuit 4 includes the first LED 41, the second LED the 42, the 3rd being sequentially connected in series
The LED 44 of LED 43 and the 4th, the anode of each LED is towards unanimously.
Further, the analog switching circuit 2 includes the electronic switch 21 of multiple electrical connections；The electronic switch 21 wraps
The first pressure limiting resistance 211, first switch triode 212, the second pressure limiting resistance 213, second switch triode the 214, the 3rd is included to limit
Piezoresistance 215, the 3rd switch triode 216, the 4th pressure limiting resistance 217 and the 4th switch triode 218；First pressure limiting resistance
211 1 ends are connected to the node between the first divider resistance 11 and the second divider resistance 12, another to be terminated at first switch triode
212 base stage, the colelctor electrode of first switch triode 212 are connected to the negative electrode and ground terminal of the first LED 41, emitter stage difference respectively
It is connected to the anode of the first LED 41 and the colelctor electrode of second switch triode 214；The end of second pressure limiting resistance 213 1 is connected to second
Node between the divider resistance 13 of divider resistance 12 and the 3rd, another base stage for being terminated at second switch triode 214, second opens
The colelctor electrode for closing triode 214 is connected to the negative electrode of the second LED 42, and emitter stage is connected to the anode and the of the second LED 42 respectively
The colelctor electrode of three switch triode 216；The end of 3rd pressure limiting resistance 215 1 be connected to the 3rd divider resistance 13 and the 4th divider resistance 14 it
Between node, another base stage for being terminated at the 3rd switch triode 216, the colelctor electrode of the 3rd switch triode 216 is connected to the 3rd
The negative electrode of LED 43, emitter stage are connected to the anode of the 3rd LED 43 and the colelctor electrode of the 4th switch triode 218 respectively；4th
The end of pressure limiting resistance 217 1 is connected to the node between the 4th divider resistance 14 and the 5th divider resistance 15, another to be terminated at the 4th and open
The base stage of triode 218 is closed, the colelctor electrode of the 4th switch triode 218 is connected to the negative electrode of the 4th LED 44, and emitter stage connects respectively
In the anode of the 4th LED 44 and the emitter stage of triode 33.
Further, the current-limiting control circuit 3 includes the first current-limiting resistance 31, the second current-limiting resistance being sequentially connected electrically
32nd, triode 33 and photo-coupler 34；The photo-coupler 34 includes light emitting diode 341 and optocoupler triode 342, and luminous two
The anode of pole pipe 341 is connected to the negative electrode of the 3rd LED 43, and the negative electrode of light emitting diode 341 is connected to the anode of the second LED 42,
The emitter stage of optocoupler triode 342 is connected to the emitter stage of triode 33, and the colelctor electrode of optocoupler triode 342 is connected to triode 33
Base stage；One end of first current-limiting resistance 31 is connected to input, another colelctor electrode for being terminated at triode 33, the second current limliting electricity
One end of resistance 32 is connected to input, another base stage for being terminated at triode 33.
Further, the He of voltage-regulator diode 5 is additionally provided between the colelctor electrode of the first switch triode 212 and ground terminal
Current-limiting resistance 50.
Workflow of the present utility model is as follows：
Now with the first LED 41, the second LED 42, the 3rd LED 43, the 4th LED 44 is respectively 12V, 50V,
Further illustrated exemplified by 100V, 220V voltage instruction.When input N1 voltages are 12V, through the partial pressure of divider resistance first electricity
Resistance 11, the second divider resistance 12, the 3rd divider resistance 13, the 4th divider resistance 14, the partial pressure of the 5th divider resistance 15, makes triode
Second switch triode 214, the 3rd switch triode 216, the base stage of the 4th switch triode 218, the conducting of emitter stage positively biased, the
The base stage of one switch triode 212, the reverse-biased cut-off of emitter stage, the base stage of triode 3, the conducting of emitter stage positively biased, electric current from N1 →
Switch triode 216ec → the second of the switch triode 218ec of first 31 → triode of current-limiting resistance 33ce → the 4th → the 3rd opens
Triode 214ec → the first LED → voltage-regulator diode 5 → current-limiting resistance, 50 → ground terminal is closed, the first LED is lighted.
When N1 inputs 100V voltage, voltage is through the first divider resistance 11, the second divider resistance 12, the 3rd divider resistance
13rd, the 4th divider resistance 14 and the partial pressure of the 5th divider resistance 15, base stage, the positive local derviation of emitter stage of the 4th switch triode 218 are made
It is logical, first switch triode 212, the base stage of the switch triode 216 of second switch triode 214 and the 3rd, reverse-biased section of emitter stage
Only, the base stage of triode 33, the conducting of emitter stage positively biased, electric current are opened from 31 → triode of current-limiting resistance 33ce → 4th of N1 → first
Close the LED 41 of the triode 218ec → anode cathode of the 3rd 43 → light emitting diode of LED 341 → second LED 42 → the first →
Voltage-regulator diode 5 → current-limiting resistance, 50 → ground terminal, make the first LED 41, the second LED 42 and the 3rd LED 43 luminous.When
First LED 41, the second LED 42 and the 3rd LED 43 luminous moment, electric current flow through light emitting diode 341, light simultaneously
Coupling triode 342ce turn on, the base stage of triode 33, emitter voltage drop is less than 0.7V, triode 33 ends, electric current from N1 →
The switch triode 218ec of second 32 → triode of current-limiting resistance 33be → the 4th → anode of three LEDs → light emitting diode 341
The LED of negative electrode → second → the first LED → voltage-regulator diode 5 → current-limiting resistance, 50 → ground terminal, the resistance of the second current-limiting resistance 32
Value, so as to play a part of current limliting, makes N1 input the voltage of several hectovolts, flows through circuit much larger than the resistance of the first current-limiting resistance 31
Electric current also only have several milliamperes.
Embodiment of the present utility model is the foregoing is only, not thereby limits the scope of the claims of the present utility model, it is every
The equivalent structure or equivalent flow conversion made using the utility model specification and accompanying drawing content, or be directly or indirectly used in
Other related technical areas, similarly it is included in scope of patent protection of the present utility model.
Claims (6)
- A kind of 1. circuit for testing voltage, it is characterised in that：Including one with test lead input electrically connect receive its input voltage and It is modulated into the bleeder circuit of different output voltages（1）With bleeder circuit（1）Electrical connection receives the analog switch electricity of its output voltage Road（2）With analog switching circuit（2）Electrical connection receives the voltage indicating circuit of its control electric signal sent（4）With one end with Test lead electrically connects the other end and voltage indicating circuit（4）Electrically connect and be used for controlling stream overvoltage indicating circuit（4）Size of current Current-limiting control circuit（3）.
- A kind of 2. circuit for testing voltage according to claim 1, it is characterised in that：The bleeder circuit（1）Including successively First divider resistance of series connection（11）, the second divider resistance（12）, the 3rd divider resistance（13）, the 4th divider resistance（14）With Five divider resistances（15）, the first divider resistance（11）Electrically connected with test input, the 5th divider resistance（15）Earth terminal.
- A kind of 3. circuit for testing voltage according to claim 2, it is characterised in that：The voltage indicating circuit（4）Including The first LED being sequentially connected in series（41）, the second LED（42）, the 3rd LED（43）With the 4th LED（44）, each LED Anode towards consistent.
- A kind of 4. circuit for testing voltage according to claim 3, it is characterised in that：The analog switching circuit（2）Including The electronic switch of multiple electrical connections（21）；The electronic switch（21）Including the first pressure limiting resistance（211）, first switch triode （212）, the second pressure limiting resistance（213）, second switch triode（214）, the 3rd pressure limiting resistance（215）, the 3rd switch triode （216）, the 4th pressure limiting resistance（217）And the 4th switch triode（218）；First pressure limiting resistance（211）One end is connected to first Divider resistance（11）With the second divider resistance（12）Between node, it is another to be terminated at first switch triode（212）Base stage, First switch triode（212）Colelctor electrode be connected to the first LED respectively（41）Negative electrode and ground terminal, emitter stage be connected to respectively One LED（41）Anode and second switch triode（214）Colelctor electrode；Second pressure limiting resistance（213）One end is connected to second Divider resistance（12）With the 3rd divider resistance（13）Between node, it is another to be terminated at second switch triode（214）Base stage, Second switch triode（214）Colelctor electrode be connected to the second LED（42）Negative electrode, emitter stage is connected to the second LED respectively （42）Anode and the 3rd switch triode（216）Colelctor electrode；3rd pressure limiting resistance（215）One end is connected to the 3rd divider resistance （13）With the 4th divider resistance（14）Between node, it is another to be terminated at the 3rd switch triode（216）Base stage, the 3rd switch Triode（216）Colelctor electrode be connected to the 3rd LED（43）Negative electrode, emitter stage is connected to the 3rd LED respectively（43）Anode With the 4th switch triode（218）Colelctor electrode；4th pressure limiting resistance（217）One end is connected to the 4th divider resistance（14）With the 5th Divider resistance（15）Between node, it is another to be terminated at the 4th switch triode（218）Base stage, the 4th switch triode （218）Colelctor electrode be connected to the 4th LED（44）Negative electrode, emitter stage is connected to the 4th LED respectively（44）Anode and three poles Pipe（33）Emitter stage.
- A kind of 5. circuit for testing voltage according to claim 4, it is characterised in that：The current-limiting control circuit（3）Including The first current-limiting resistance being sequentially connected electrically（31）, the second current-limiting resistance（32）, triode（33）And photo-coupler（34）；The light Coupler（34）Including light emitting diode（341）With optocoupler triode（342）, light emitting diode（341）Anode be connected to the 3rd LED（43）Negative electrode, light emitting diode（341）Negative electrode be connected to the second LED（42）Anode, optocoupler triode（342） Emitter stage be connected to triode（33）Emitter stage, optocoupler triode（342）Colelctor electrode be connected to triode（33）Base stage；Institute State the first current-limiting resistance（31）An end be connected to input, it is another to be terminated at triode（33）Colelctor electrode, the second current-limiting resistance （32）An end be connected to input, it is another to be terminated at triode（33）Base stage.
- A kind of 6. circuit for testing voltage according to claim 5, it is characterised in that：The first switch triode（212） Colelctor electrode and ground terminal between be additionally provided with voltage-regulator diode（5）And current-limiting resistance（50）.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720761639.0U CN206832880U (en) | 2017-06-28 | 2017-06-28 | A kind of circuit for testing voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720761639.0U CN206832880U (en) | 2017-06-28 | 2017-06-28 | A kind of circuit for testing voltage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206832880U true CN206832880U (en) | 2018-01-02 |
Family
ID=60778281
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720761639.0U Expired - Fee Related CN206832880U (en) | 2017-06-28 | 2017-06-28 | A kind of circuit for testing voltage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206832880U (en) |
-
2017
- 2017-06-28 CN CN201720761639.0U patent/CN206832880U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| 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: 20180102 |