CN205229277U - Level detection circuit - Google Patents
Level detection circuit Download PDFInfo
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- CN205229277U CN205229277U CN201521101249.8U CN201521101249U CN205229277U CN 205229277 U CN205229277 U CN 205229277U CN 201521101249 U CN201521101249 U CN 201521101249U CN 205229277 U CN205229277 U CN 205229277U
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- emitting diode
- light emitting
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- circuit
- relay
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Abstract
The utility model relates to a circuit detection area discloses a level detection circuit, and this circuit includes: the relay is waited to detect the level and is inputed to the control end of relay, and a light emitting diode, a light emitting diode anodal with the normally open contact of relay connects, a light emitting diode's minus earth under the circumstances that a light emitting diode shines, judge it is the high level to wait to detect the level under the circumstances that a light emitting diode did not work, judge it is the low level to wait to detect the level. Just can audio -visual detect out the level just through the bright of emitting diode with not working in level detection circuit to detection circuitry is simply portable.
Description
Technical field
The utility model relates to electric circuit inspection field, particularly, relates to a kind of level sensitive circuit.
Background technology
Along with the widespread use of electronic circuit, need the low and high level detecting some dedicated line in some cases, but general testing circuit can only detect the low and high level under specific voltage, exceeding certain voltage scope will damaged circuit, and rare assay device structures is comparatively complicated and costly.
Utility model content
The purpose of this utility model is to provide a kind of level sensitive circuit, this level sensitive circuit can simple and convenient and detect intuitively level height.
To achieve these goals, the utility model provides a kind of level sensitive circuit, and this circuit comprises: relay, and level to be detected inputs to the control end of relay; And first light emitting diode, the positive pole of this first light emitting diode is connected with the normally opened contact of described relay, the minus earth of this first light emitting diode, when described first light emitting diode is bright, judge that described level to be detected is high level, when described first light emitting diode does not work, judge that described level to be detected is low level.
Preferably, described circuit also comprises: the second light emitting diode, and the positive pole of this second light emitting diode is connected with the normally closed contact of described relay, the minus earth of this second light emitting diode, when this second light emitting diode is bright, judge that described level to be detected is low level.
Preferably, described circuit also comprises: the first resistance, connects with described first light emitting diode.
Preferably, described circuit also comprises: the second resistance, connects with described second light emitting diode.
Preferably, described circuit also comprises: power supply, and the positive pole of this power supply is connected with the common port of described relay, minus earth.
Preferably, described circuit also comprises: electrochemical capacitor and ceramic disc capacitor, with described power sources in parallel after this electrochemical capacitor is in parallel with ceramic disc capacitor, for filtering high-frequency interferencing signal.
Preferably, described power supply is composed in series by two dry cells.
Preferably, described relay is solid-state relay.
Preferably, described first light emitting diode is patch light-emitting diode.
Preferably, described second light emitting diode is patch light-emitting diode.
By technique scheme, utilize relay and light emitting diode composition level sensitive circuit, just can detect that level just by the bright of light emitting diode intuitively with not working, and testing circuit is simply portable.
Other features and advantages of the utility model are described in detail in embodiment part subsequently.
Accompanying drawing explanation
Accompanying drawing is used to provide further understanding of the present utility model, and forms a part for instructions, is used from explanation the utility model, but does not form restriction of the present utility model with embodiment one below.In the accompanying drawings:
Fig. 1 shows the connection layout of level sensitive circuit provided by the utility model; And
Fig. 2 shows the connection layout of the level sensitive circuit of the utility model one embodiment.
Description of reference numerals
10 power supply 20 relays
C1 electrochemical capacitor C2 ceramic disc capacitor
LED1 first LED 2 second light emitting diode
R1 first resistance R2 second resistance
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in detail.Should be understood that, embodiment described herein, only for instruction and explanation of the utility model, is not limited to the utility model.
Fig. 1 shows the connection layout of level sensitive circuit provided by the utility model.As shown in Figure 1, the utility model provides a kind of level sensitive circuit, and this circuit can comprise: relay 20, and level to be detected inputs to the control end 8 of relay 20; And the first light emitting diode LED1, the positive pole of this first light emitting diode LED1 is connected with the normally opened contact 4 of described relay 20, the minus earth of this first light emitting diode LED1, when described first light emitting diode LED1 is bright, can judge that described level to be detected is high level, when described first light emitting diode LED1 does not work, judge that described level to be detected is low level.
Preferably, level sensitive circuit can also comprise: the first resistance R1, connects with the first light emitting diode LED1, carries out current-limiting protection to the first light emitting diode LED1, prevents the first light emitting diode LED1 from burning.
With further reference to Fig. 1, level sensitive circuit can also comprise power supply 10, the positive pole of power supply 10 is connected to the common port 3 of relay 20, minus earth.When measuring level, the ground of measured circuit is connected with the ground of level sensitive circuit.
Here the high level of detection place or low level be that the inside forward voltage of relative relay 20 is correlated with, such as, the inside forward voltage of relay 20 is 2V, if level to be detected is higher than 2V, relay 20 conducting, normally opened contact 4 is closed, the first light emitting diode LED1, then level to be detected is high level, on the contrary, level to be detected is low level.
Fig. 2 shows the connection layout of the level sensitive circuit of the utility model one embodiment.As shown in Figure 2, in this embodiment, level sensitive circuit can comprise: relay 20, the first light emitting diode LED1, the second LED 2, power supply 10.
During concrete connection, the positive pole of power supply 10 is connected to the common port 3 of relay 20, minus earth; First light emitting diode LED1 positive pole is connected to the normally opened contact 4 of relay 20, minus earth; Second LED 2 positive pole is connected to the normally closed contact of relay 20, minus earth; By contact 1 ground connection of relay 20.
The ground of measured circuit is connected with the ground of level sensitive circuit, level to be detected is connected to the control end 8 of relay 20, opening power 10, if the first light emitting diode LED1 is bright, then represent that level to be detected is high level, if the second LED 2 is bright, then represent that level to be detected is low level.In addition, when the control end 8 of relay 20 is unsettled, opening power 10, the second LED 2 is also by bright.
Further; in this embodiment; level sensitive circuit can also comprise: the first resistance R1 and the second resistance R2; the resistance of the first resistance R1 and the second resistance R2 can be 20 Ω; first resistance R1 connects with the first light emitting diode LED1; current-limiting protection is carried out to the first light emitting diode LED1, prevents the first light emitting diode LED1 from burning.Second resistance R2 connects with the second LED 2, carries out current-limiting protection to the second light emitting diode LED2, prevents the second light emitting diode LED2 from burning.
With further reference to Fig. 2, level sensitive circuit can also comprise electrochemical capacitor C1 and ceramic disc capacitor C2, in parallel with described power supply 10 after this electrochemical capacitor C1 is in parallel with ceramic disc capacitor C2, for the high frequency interference small-signal that filter out power 10 is caused when opening or closing.The capacitance of electrochemical capacitor C1 is 10uF, and withstand voltage is 16V, and the capacitance of ceramic disc capacitor C2 is 0.1uF.
Preferably, the first LED 1 and the second light emitting diode LED2 can be patch light-emitting diode.In addition, can select red patch light emitting diode by the first LED 1, the second light emitting diode LED2 can select green patch light-emitting diode, but the utility model is not restricted to this.
The solid-state relay that relay 20 can be made up of chip IC 1, the control end of this solid-state relay can have Width funtion input (as 3 ~ 20V).
Level sensitive circuit provided by the utility model adopts relay and light emitting diode composition, just can detect that level just intuitively with not working, and testing circuit is simply portable by the bright of light emitting diode.
Below preferred implementation of the present utility model is described by reference to the accompanying drawings in detail; but; the utility model is not limited to the detail in above-mentioned embodiment; within the scope of technical conceive of the present utility model; can carry out multiple simple variant to the technical solution of the utility model, these simple variant all belong to protection domain of the present utility model.
It should be noted that in addition, each concrete technical characteristic described in above-mentioned embodiment, in reconcilable situation, can be combined by any suitable mode, in order to avoid unnecessary repetition, the utility model illustrates no longer separately to various possible array mode.
In addition, also can carry out combination in any between various different embodiment of the present utility model, as long as it is without prejudice to thought of the present utility model, it should be considered as content disclosed in the utility model equally.
Claims (10)
1. a level sensitive circuit, is characterized in that, this circuit comprises:
Relay, level to be detected inputs to the control end of relay; And
First light emitting diode, the positive pole of this first light emitting diode is connected with the normally opened contact of described relay, the minus earth of this first light emitting diode,
When described first light emitting diode is bright, judge that described level to be detected is high level, when described first light emitting diode does not work, judge that described level to be detected is low level.
2. circuit according to claim 1, is characterized in that, described circuit also comprises:
Second light emitting diode, the positive pole of this second light emitting diode is connected with the normally closed contact of described relay, the minus earth of this second light emitting diode, when this second light emitting diode is bright, judges that described level to be detected is low level.
3. circuit according to claim 1 and 2, is characterized in that, described circuit also comprises:
First resistance, connects with described first light emitting diode.
4. circuit according to claim 2, is characterized in that, described circuit also comprises:
Second resistance, connects with described second light emitting diode.
5. circuit according to claim 1, is characterized in that, described circuit also comprises:
Power supply, the positive pole of this power supply is connected with the common port of described relay, minus earth.
6. circuit according to claim 5, is characterized in that, described circuit also comprises: electrochemical capacitor and ceramic disc capacitor, with described power sources in parallel after this electrochemical capacitor is in parallel with ceramic disc capacitor, for filtering high-frequency interferencing signal.
7. circuit according to claim 5, is characterized in that, described power supply is composed in series by two dry cells.
8. circuit according to claim 1, is characterized in that, described relay is solid-state relay.
9. circuit according to claim 1, is characterized in that, described first light emitting diode is patch light-emitting diode.
10. circuit according to claim 2, is characterized in that, described second light emitting diode is patch light-emitting diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521101249.8U CN205229277U (en) | 2015-12-25 | 2015-12-25 | Level detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521101249.8U CN205229277U (en) | 2015-12-25 | 2015-12-25 | Level detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205229277U true CN205229277U (en) | 2016-05-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201521101249.8U Active CN205229277U (en) | 2015-12-25 | 2015-12-25 | Level detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205229277U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109613912A (en) * | 2018-12-21 | 2019-04-12 | 惠州市德赛西威汽车电子股份有限公司 | A kind of test stand system for air conditioning for automobiles product |
-
2015
- 2015-12-25 CN CN201521101249.8U patent/CN205229277U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109613912A (en) * | 2018-12-21 | 2019-04-12 | 惠州市德赛西威汽车电子股份有限公司 | A kind of test stand system for air conditioning for automobiles product |
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