CN202275281U - Timer - Google Patents
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- Publication number
- CN202275281U CN202275281U CN2011202478768U CN201120247876U CN202275281U CN 202275281 U CN202275281 U CN 202275281U CN 2011202478768 U CN2011202478768 U CN 2011202478768U CN 201120247876 U CN201120247876 U CN 201120247876U CN 202275281 U CN202275281 U CN 202275281U
- Authority
- CN
- China
- Prior art keywords
- pin
- control unit
- signal input
- input circuit
- timer
- 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 discloses a timer which comprises a micro control unit connected with a signal input circuit of equipment, wherein a reset circuit, a display unit and the signal input circuit are connected onto the micro control unit. The timer is mainly characterized in that the signal input circuit comprises a photoelectric coupler; two paths of input signals are respectively connected with a current-limiting resistor in series and then are connected with a first pin and a second pin of the photoelectric coupler; diodes of which the polarities are opposite to each other are connected between the first pin and the second pin of the photoelectric coupler in parallel; a third pin of the photoelectric coupler is grounded; a fourth pin of the photoelectric coupler is connected with a resistor R9 and then is connected with the micro control unit; and a power supply is serially connected with a resistor R7 and then is connected between the fourth pin and the resistor R9. The timer disclosed by the utility model is simple in structure; and the distinguishing of a positive electrode from a negative electrode of the signal input circuit is avoided, and thus the convenience for operation is realized and the work efficiency of an operator is greatly increased.
Description
Technical field
The utility model relates to a kind of timer, relates in particular to the signal input circuit in the timer.
Background technology
A lot of equipment all need carry out certain timework when operation.At present, generally adopt this structure of forming by micro-control unit, reset circuit, bleeder circuit and display unit, wherein partly should be noted that the polarity of input current, brought inconvenience to the staff like this at signal output apparatus.
The utility model content
The purpose of the utility model provides a kind of timer simple in structure.
To achieve these goals; Adopt following technical scheme: a kind of timer, comprise the micro-control unit that links to each other with the device signal input circuit, be connected with reset circuit, display unit and signal input circuit on the said micro-control unit; It is characterized in that: said signal input circuit comprises photoelectrical coupler; The two-way input signal links to each other with crus secunda with first pin of photoelectrical coupler after being connected in series current-limiting resistance respectively, is parallel with opposite polarity diode between photoelectrical coupler first pin and the crus secunda, the tripod ground connection of photoelectrical coupler; Connect micro-control unit behind the 4th pin connecting resistance R9, receive after the power series resistance R 7 between the 4th pin and the resistance R 9.
As further optimization, simple in structure in order to make, energy-conservation, said display unit is a LCDs, is connected with the bleeder circuit to the LCDs dividing potential drop on the said micro-control unit.
The utility model is simple in structure, and signal input circuit need not be distinguished both positive and negative polarity, and is easy to operate, the very big work efficiency that has improved operating personnel.
Description of drawings
Fig. 1 is the electrical schematic diagram of the utility model;
Fig. 2 is the physical circuit figure of reset circuit among Fig. 1;
Fig. 3 is the physical circuit figure of bleeder circuit among Fig. 1;
Fig. 4 is the physical circuit figure of power circuit among Fig. 1;
Fig. 5 is the physical circuit figure of signal input circuit among Fig. 1;
Fig. 6 is the inner structure synoptic diagram of photoelectrical coupler among Fig. 5.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the utility model is done further description.
Extremely shown in Figure 6 like Fig. 1; A kind of timer; Comprise the micro-control unit that links to each other with the device signal input circuit; Be connected with reset circuit, display unit and signal input circuit on the said micro-control unit, wherein display unit is a LCDs, is connected with the bleeder circuit to the LCDs dividing potential drop on the said micro-control unit.
Said signal input circuit comprises photoelectrical coupler; The two-way input signal links to each other with crus secunda with first pin of photoelectrical coupler after being connected in series current-limiting resistance respectively; Be parallel with opposite polarity diode between photoelectrical coupler first pin and the crus secunda; The tripod ground connection of photoelectrical coupler connects micro-control unit behind the 4th pin connecting resistance R9, receives after the power series resistance R 7 between the 4th pin and the resistance R 9.
Because have parallel connection between first pin of photoelectrical coupler and the crus secunda, opposite polarity two diodes when signal is imported, need not to consider both positive and negative polarity like this, have simplified operation.
Wherein reset circuit, bleeder circuit, power circuit are existing mature technology, are not detailing at this.
More than show and described ultimate principle of the utility model and the advantage of principal character and the utility model.The technician of the industry should understand; The utility model is not restricted to the described embodiments; The principle of describing in the foregoing description and the instructions that the utility model just is described; Under the prerequisite that does not break away from the utility model spirit and scope, the utility model also has various changes and modifications, and these variations and improvement all fall in the utility model scope that requires protection.
Claims (2)
1. timer; Comprise the micro-control unit that links to each other with the device signal input circuit; Be connected with reset circuit, display unit and signal input circuit on the said micro-control unit, it is characterized in that: said signal input circuit comprises photoelectrical coupler, and the two-way input signal links to each other with crus secunda with first pin of photoelectrical coupler after being connected in series current-limiting resistance respectively; Be parallel with opposite polarity diode between photoelectrical coupler first pin and the crus secunda; The tripod ground connection of photoelectrical coupler connects micro-control unit behind the 4th pin connecting resistance R9, receives after the power series resistance R 7 between the 4th pin and the resistance R 9.
2. timer as claimed in claim 1 is characterized in that: said display unit is a LCDs, is connected with the bleeder circuit to the LCDs dividing potential drop on the said micro-control unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202478768U CN202275281U (en) | 2011-07-14 | 2011-07-14 | Timer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202478768U CN202275281U (en) | 2011-07-14 | 2011-07-14 | Timer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202275281U true CN202275281U (en) | 2012-06-13 |
Family
ID=46195627
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202478768U Expired - Fee Related CN202275281U (en) | 2011-07-14 | 2011-07-14 | Timer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202275281U (en) |
-
2011
- 2011-07-14 CN CN2011202478768U patent/CN202275281U/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: 20120613 Termination date: 20190714 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |