CN2037870U - Automatic power switch for radiophotograph machine - Google Patents
Automatic power switch for radiophotograph machine Download PDFInfo
- Publication number
- CN2037870U CN2037870U CN 88213565 CN88213565U CN2037870U CN 2037870 U CN2037870 U CN 2037870U CN 88213565 CN88213565 CN 88213565 CN 88213565 U CN88213565 U CN 88213565U CN 2037870 U CN2037870 U CN 2037870U
- Authority
- CN
- China
- Prior art keywords
- radiophotograph
- machine
- circuit
- automatic power
- power supply
- 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.)
- Withdrawn
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Abstract
The utility model relates to an automatic power switch for a radiophotograph machine, which is composed of an input circuit and an amplifying and control circuit. The automatic power switch makes use of the ringing signal of the radiophotograph machine to control the on-off of the power supply line of the radiophotograph machine through a switch circuit so as to make the radiophotograph machine only work when information needs to be transmitted, and the automatic power switch changes the present operating state of the radiophotograph machine continuously opened day and night so as to extend the service life of the radiophotograph machine and save electric energy. The utility model can also be used for controlling the power supply of the microcomputer and domestic appliances.
Description
The utility model belongs to communication apparatus power supply automatic control equipment.
The conventional usage of facsimile machine is no matter whether transmission line has signal at present, facsimile machine all is in the power connection state, because facsimile machine is started shooting for a long time, therefore caused machine intimate overheated, quickened the aging of components and parts, reduce the useful life of facsimile machine, also caused a large amount of waste of energy simultaneously.At this situation, the utility model adopts the switch of being made up of electronic device, and its input and facsimile machine input also connect, the power circuit of output control facsimile machine.When no signal on the signal transmssion line is imported, cut off the facsimile machine power supply automatically, when importing, connects extraneous signal the facsimile machine power supply.
The purpose of this utility model is to provide a kind of facsimile machine when no signal is imported, and is in off state, the automatic power supply switch of automatic unlatching work when the signal input is arranged.
The utility model is made up of input circuit, amplification control circuit, and the input of input circuit and facsimile machine input also connect, and promptly docks with the facsimile transmission line, and input circuit adopts general rectifier circuit.Basic functional principle of the present utility model is that when no signal was imported, the direct voltage on the transmission line was added to the prime T of amplification control circuit through input circuit
1Base stage, T
1Conducting, thus final driver is ended, switch element is failure to actuate, and facsimile machine is not worked.When signal was imported, the amplification control circuit prime was ended, and final stage drives conducting, switch element action, facsimile machine power connection.
Accompanying drawing is circuit theory diagrams of the present utility model.
Now in conjunction with the accompanying drawings content of the present utility model and enforcement are done an introduction in detail:
When K switch is connected on, output voltage U
Out=220V supplies with the facsimile machine power supply, and this is a regular situation.
When K switch was connected AOTO, circuit was in wait state, on this moment signal transmssion line direct voltage be added to input circuit AB end.Input circuit is a rectification circuit, during the no signal input, provides path to the direct voltage on the transmission line, is added to resistance R
7On, and pass through resistance R
2Be added to and amplify front stage transistor T
1Base stage.During the no signal input, T
1The pipe base stage is a high potential, T
1The pipe conducting.Its current collection is electronegative potential very, T
2Pipe ends, drive stage transistors T
3End.Relay τ does not work, and relay normally open contact is in off-state, and the facsimile machine power supply disconnects.When the signal input is arranged, i.e. during off-hook or ring, be added to resistance R through input circuit
7On current potential descend T
1Pipe ends, and its collector potential rises, and makes T
2The pipe conducting, its emitter current potential rises, and gives capacitor C
2Charging, transistor T
3Conducting.Relay τ work, contacting is powered to facsimile machine; As when on-hook (once more) after the signal end of transmission, T
1The pipe conducting, T
2Pipe ends, and this moment is because in capacitor C
2On be filled with certain voltage, so transistor T
3Still be in conducting state, pass through C
2, R
4, R
5The loop discharge.Play time-lag action, discharge until relay, the contact disconnects, and the facsimile machine power supply disconnects.Circuit is in wait state again.Amplification control of the present utility model partly can be adopted integrated circuit, and as rest-set flip-flop, voltage comparator, this schmitt trigger etc., relay τ can replace with ghyristor circuit.
Introduce embodiment of the present utility model below: because input terminal voltage is higher, string has dropping resistor R in input circuit in force
9, R
10, at T
1Pipe, T
2Be connected to isolating diode D between the pipe
1, T
2Pipe and T
3Be connected to D between the pipe
2, C in the delay circuit
2=100 μ f, R
4=1K Ω, R
5=240 Ω, resistance R
6Show light-emitting diode D
5Branch road, light-emitting diode D
7, R
8, D
8Branch road shows as automatic switch power supply and facsimile machine power supply status respectively.
After adopting the utility model, can prolong the service life of facsimile machine, improve its service efficiency.
The utility model also can be used for the power supply control of microcomputer, or the control of the power supply of some household electrical appliance, the effect of playing economize on electricity and increasing the service life.
Claims (3)
1. a facsimile machine automatic power supply switch is made up of input circuit, amplification control circuit, it is characterized in that the input and the facsimile machine input of input circuit and connects; Control circuit drives relay normally open contact and is serially connected with in the facsimile machine power circuit.
2. automatic power supply switch according to claim 1 is characterized in that input circuit is a diode rectifier circuit.
3. according to claim 1 and 2 described automatic power supply switchs, it is characterized in that the driving stage T of amplification control circuit
3Base loop, be connected to capacitor C
2, R
4The delay circuit that constitutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88213565 CN2037870U (en) | 1988-08-30 | 1988-08-30 | Automatic power switch for radiophotograph machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88213565 CN2037870U (en) | 1988-08-30 | 1988-08-30 | Automatic power switch for radiophotograph machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2037870U true CN2037870U (en) | 1989-05-17 |
Family
ID=4846651
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88213565 Withdrawn CN2037870U (en) | 1988-08-30 | 1988-08-30 | Automatic power switch for radiophotograph machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2037870U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102662335A (en) * | 2012-04-28 | 2012-09-12 | 四川电力科学研究院 | Electronic remote random controller |
| CN103676685A (en) * | 2012-09-19 | 2014-03-26 | 成都达瑞斯科技有限公司 | Simple and energy-saving power supply control device for fax machine |
-
1988
- 1988-08-30 CN CN 88213565 patent/CN2037870U/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102662335A (en) * | 2012-04-28 | 2012-09-12 | 四川电力科学研究院 | Electronic remote random controller |
| CN103676685A (en) * | 2012-09-19 | 2014-03-26 | 成都达瑞斯科技有限公司 | Simple and energy-saving power supply control device for fax machine |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |