JPS5559530A - Contact information take-in circuit - Google Patents
Contact information take-in circuitInfo
- Publication number
- JPS5559530A JPS5559530A JP13151378A JP13151378A JPS5559530A JP S5559530 A JPS5559530 A JP S5559530A JP 13151378 A JP13151378 A JP 13151378A JP 13151378 A JP13151378 A JP 13151378A JP S5559530 A JPS5559530 A JP S5559530A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- voltage
- contact
- primary side
- transformer
- 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.)
- Pending
Links
Landscapes
- Input From Keyboards Or The Like (AREA)
- Control By Computers (AREA)
Abstract
PURPOSE: To reduce the amount of heat generation and then to realize the miniaturization of the device by connecting the switch means at the primary side along with the contact connected to the secondary side of the transformer each and also installing the means which converts the primary side voltage into the digital signal at the ON time of the switch means.
CONSTITUTION: Contacts 1aW1n are connected to the secondary side of transformer 12, and at the same time transistor Tr16 and power source VC plus comparator circuit 7 are connected to the primary side respectively. The base of Tr16 is connected to timing circuit 21 via scanning lines 19aW19n. Circuit 21 transmits the pulse of a fixed duration cyclically, and thus each Tr16 is turned on in sequence. If contact 1a is closed when Tr16 is on, the voltage of detection line 17 becomes zero virtually and becomes nearly identical to voltage VC in case 1a is open respectively. This voltage is compared with reference voltage Vref and then converted through circuit 7 into the digital signal level corresponding to the switch of the contact to be turned into the input signal of FF18. The signal applied to FF18 is set by the set pulse given from circuit 21. As the contact current is flowed in the time-division cyclic way, the heat generation can be reduced.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13151378A JPS5559530A (en) | 1978-10-27 | 1978-10-27 | Contact information take-in circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13151378A JPS5559530A (en) | 1978-10-27 | 1978-10-27 | Contact information take-in circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5559530A true JPS5559530A (en) | 1980-05-06 |
Family
ID=15059785
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13151378A Pending JPS5559530A (en) | 1978-10-27 | 1978-10-27 | Contact information take-in circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5559530A (en) |
-
1978
- 1978-10-27 JP JP13151378A patent/JPS5559530A/en active Pending
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