CN203278678U - Circuit of visual power supply of building video intercommunication system - Google Patents
Circuit of visual power supply of building video intercommunication system Download PDFInfo
- Publication number
- CN203278678U CN203278678U CN 201320321406 CN201320321406U CN203278678U CN 203278678 U CN203278678 U CN 203278678U CN 201320321406 CN201320321406 CN 201320321406 CN 201320321406 U CN201320321406 U CN 201320321406U CN 203278678 U CN203278678 U CN 203278678U
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- CN
- China
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- terminal
- terminal regulator
- power supply
- circuit
- protective tube
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- Expired - Fee Related
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Abstract
The utility model relates to a circuit of a visual power supply of building video intercommunication system, comprising a rectifier bridge, a three terminal voltage regulator, a first capacitor, a second capacitor, a first resistor, a second resistor, an adjustable potentiometer and a self-recovery protective tube; the rectifier bridge is connected to the three terminal voltage regulator; the first capacitor is connected between the rectifier bridge and the three terminal regulator in parallel; the self-recovery protective tube is connected to the output terminal of the three terminal regulator in series, and the second capacitor is connected between the three terminal regulator and the self-recovery protective tube in parallel; the Adj terminal of the three terminal voltage regulator is connected to the second resistor and the adjustable potentiometer in series; and the first resistor is connected between the Adj terminal and the output terminal. The circuit of the visual power supply of the building video intercommunication system has advantages that the output voltage can be adjusted from 15V to 18V and installation requirements of various constructions can be met.
Description
Technical field
The utility model relates to a kind of circuit of visual power supply, especially relates to the circuit of visual power supply in a kind of visual building conversation system.
Background technology
Along with the raising of people life level, the building conversational system of residential quarter is also upgraded to video intercom by original non-visible dialogue system.In order to guarantee the job stability of building talkback, very high requirement has been proposed the power supply in building conversational system.
At present, in building conversational system, the circuit of visual power supply can't make output voltage regulate between 18V at 15V, is difficult to satisfy the needs of different project installation.
Summary of the invention
For above problem, the purpose of this utility model is to provide a kind of output voltage that can make to regulate between 18V at 15V, can satisfy the circuit of visual power supply in the visual building conversation system of different project installation needs.
A technology contents of the present utility model is, the circuit of visual power supply in a kind of visual building conversation system is characterized in that it comprises rectifier bridge, three terminal regulator, the first electric capacity, the second electric capacity, the first resistance, the second resistance, adjustable potentiometer and certainly recovers protective tube; Rectifier bridge is connected with three terminal regulator; The first Capacitance parallel connection is between rectifier bridge and three terminal regulator; Be serially connected on the output of three terminal regulator from recovering protective tube, the second Capacitance parallel connection is at three terminal regulator and from recovering between protective tube; Series connection the second resistance and adjustable potentiometer on the Adj end of three terminal regulator; Be connected with the first resistance between the Adj end of three terminal regulator and output.
The advantage that the utlity model has is: output voltage is regulated between 18V at 15V, can be satisfied different project installation needs.
Description of drawings
Fig. 1 is structural scheme of mechanism of the present utility model.
Specific embodiment
As shown in Figure 1, the circuit of visual power supply in a kind of visual building conversation system is characterized in that it comprises rectifier bridge U7, three terminal regulator U1, the first capacitor C 1, the second capacitor C 2, the first resistance R 1, the second resistance R 2, adjustable potentiometer RP1 and certainly recovers protective tube PTC2; Rectifier bridge U7 is connected with three terminal regulator U1; The first capacitor C 1 is connected in parallel between rectifier bridge U7 and three terminal regulator U1; Be serially connected on the output 2 of three terminal regulator U1 from recovering protective tube PTC2, the second electric capacity R2 is connected in parallel on three terminal regulator U1 and certainly recovers between protective tube PTC2; Series connection the second resistance R 2 and adjustable potentiometer RP1 on the Adj end 1 of three terminal regulator U1; Be connected with the first resistance R 1 between the Adj end 1 of three terminal regulator U1 and output 2.
Operation principle of the present utility model is: transformer secondary output output be AC18V voltage through rectifier bridge U7 rectification, capacitor C 1 filtering; The input 3 of input low voltage difference three-terminal voltage regulator U1, the output 2 constant direct voltages of output of three terminal regulator U1, then export after capacitor C 2 filtering, certainly recover protective tube PCT2 to the video intercom circuit supply through serial connection; The Adj end 1 of three terminal regulator U1 is adjusted pin for output voltage, by the variation of adjustable potentiometer RP1 resistance, output voltage can be regulated at 15V, to satisfy the needs of project installation between 18V.
Claims (1)
1. the circuit of visual power supply in a visual building conversation system, is characterized in that it comprises rectifier bridge, three terminal regulator, the first electric capacity, the second electric capacity, the first resistance, the second resistance, adjustable potentiometer and certainly recovers protective tube; Rectifier bridge is connected with three terminal regulator; The first Capacitance parallel connection is between rectifier bridge and three terminal regulator; Be serially connected on the output of three terminal regulator from recovering protective tube, the second Capacitance parallel connection is at three terminal regulator and from recovering between protective tube; Series connection the second resistance and adjustable potentiometer on the Adj end of three terminal regulator; Be connected with the first resistance between the Adj end of three terminal regulator and output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320321406 CN203278678U (en) | 2013-06-05 | 2013-06-05 | Circuit of visual power supply of building video intercommunication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320321406 CN203278678U (en) | 2013-06-05 | 2013-06-05 | Circuit of visual power supply of building video intercommunication system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203278678U true CN203278678U (en) | 2013-11-06 |
Family
ID=49509001
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320321406 Expired - Fee Related CN203278678U (en) | 2013-06-05 | 2013-06-05 | Circuit of visual power supply of building video intercommunication system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203278678U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105909927A (en) * | 2016-06-14 | 2016-08-31 | 刘玲 | Controllable intelligent projector |
-
2013
- 2013-06-05 CN CN 201320321406 patent/CN203278678U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105909927A (en) * | 2016-06-14 | 2016-08-31 | 刘玲 | Controllable intelligent projector |
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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: 20131106 Termination date: 20180605 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |