CN201072874Y - Standby circuit of television - Google Patents
Standby circuit of television Download PDFInfo
- Publication number
- CN201072874Y CN201072874Y CNU2007201196594U CN200720119659U CN201072874Y CN 201072874 Y CN201072874 Y CN 201072874Y CN U2007201196594 U CNU2007201196594 U CN U2007201196594U CN 200720119659 U CN200720119659 U CN 200720119659U CN 201072874 Y CN201072874 Y CN 201072874Y
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- voltage
- regulator
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- voltage regulator
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Abstract
The utility model provides a television standby circuit being suitable for power supply field, which comprises a switching voltage regulator; the circuit also comprises: a control switch for controlling the switching voltage regulator to work; a voltage stabilizer for connecting external plus 12V voltage to generate plus 5V voltage; a general-purpose diode and a Schottky diode separately connected with the switching voltage regulator and the voltage stabilizer, the general-purpose diode is conducted when external control signals control the switching voltage regulator to stop working and the Schottky diode is conducted when external control signals control the switching voltage regulator to work; a linear voltage stabilizer connected with the general-purpose diode and the Schottky diode and converting the input plus 5V voltage to standby voltage for output. The television standby circuit of the utility model switches over switch to control the switching voltage regulator. The switching voltage regulator or voltage stabilizer generates plus 5V voltage which is output to the linear voltage stabilizer under on mode and standby mode, which saves cost while saving power consumption.
Description
Technical field
The utility model belongs to field of power supplies, relates in particular to a kind of television set stand-by circuit.
Background technology
Along with the continuous development of electronic technology, people are more and more higher to the requirement of electronic product environmental protection and energy saving, and at the environmental protection and energy saving index legislation of household electrical appliance, clear and definite regulation has been made in classification to different product in succession for the European Union and the U.S..Television set all has a stand-by power consumption when standby, and will reach requirement, can bring the raising of cost again.
It is that a power supply adaptor output+12V by the outside finishes that the electric power of general television set is supplied with.The stand-by circuit of television set inside generally needs the voltage of one+3.3V.
Following several application is arranged in the prior art.Be described below in conjunction with accompanying drawing.
As shown in Figure 1, in the television set stand-by circuit of prior art 1,, carry out the stand-by power consumption of output+3.3V behind the linear voltage stabilization through linear voltage regulator LM1117 from external power adapter input+12V voltage.When adopting above-mentioned television set stand-by circuit, start is risen with after-current, and the pressure drop of linear voltage regulator LM1117 itself is very high, and over-burden to cause heat power consumption, influential to the life-span of linear voltage regulator LM1117.
As shown in Figure 2, in the television set stand-by circuit of prior art 2, behind the external power adapter input+12V voltage through the regulator (LM2596) of system will import+12V voltage transitions one-tenth+5V, export to the stand-by power consumption that linear voltage regulator (LM1117) carries out output+3.3V behind the linear voltage stabilization.Though reduced the ineffective power consumption of linear voltage regulator LM1117 this moment, regulator output+5V voltage produces power consumption, the power consumption of integrated circuit also rises thereupon, can't solve root problem.
As shown in Figure 3, in the television set stand-by circuit of prior art 3, from external power adapter input+12V voltage later through synchro switch pressurizer (LM2655) be directly changed into+voltage of 3.3V exports.Though reduced power consumption this moment, the cost of synchro switch pressurizer is than higher, and the cost of television set stand-by circuit will increase substantially.
Reduce the cost of television set stand-by circuit when therefore, power consumption can't be reduced in the prior art.
The utility model content
The purpose of this utility model is to provide a kind of television set stand-by circuit, is intended to solve the problem that reduces cost when existing television set stand-by circuit can't reduce power consumption.
The utility model is achieved in that a kind of television set stand-by circuit, comprises regulator, is connected generation+5V voltage with external+12V voltage, and described circuit also comprises:
Control switch with described regulator, connect and draw voltage and external control signal to be connected, is controlled the work of described regulator outward;
Pressurizer is connected generation+5V voltage with external+12V voltage;
General-purpose diode and Schottky diode are connected with described regulator and described pressurizer respectively, when standby, and general-purpose diode conducting when external control signal control switch voltage regulator quits work; General-purpose diode ends the Schottky diode conducting when external control signal control switch voltage regulator is worked;
Linear voltage regulator is connected with described general-purpose diode and Schottky diode, with input+the 5V voltage transitions becomes standby voltage to export.
Television set voltage stabilizing circuit of the present utility model is by increasing pressurizer, control switch and two dissimilar diodes, diverter switch control switch voltage regulator work or quit work, switch voltage-stabilizing adjuster generation+5V voltage is transferred to linear voltage regulator output standby voltage through diode when television boot-strap, the switch voltage-stabilizing adjuster quits work during standby, by power consumption and the lower pressurizer generation+5V voltage of cost, be transferred to linear voltage regulator output standby voltage through Schottky diode, reduced the cost of stand-by circuit when reducing the stand-by circuit power consumption.
Description of drawings
Fig. 1 is the circuit diagram of the television set stand-by circuit that provides of prior art 1.
Fig. 2 is the circuit diagram of the television set stand-by circuit that provides of prior art 2.
Fig. 3 is the circuit diagram of the television set stand-by circuit that provides of prior art 3.
Fig. 4 is the circuit diagram of the television set stand-by circuit that provides of the utility model.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer,, the utility model is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
Television set stand-by circuit of the present utility model is by increasing control switch, pressurizer, general-purpose diode D6 and Schottky diode D5, is transferred to linear voltage regulator by switch voltage-stabilizing adjuster generations+5V voltage through Schottky diode during television boot-strap and exports standby voltage under the control of control switch; The switch voltage-stabilizing adjuster quits work during standby, by power consumption and the lower pressurizer generation+5V voltage of cost, is transferred to linear voltage regulator output standby voltage through diode.
As shown in Figure 4, television set stand-by circuit of the present utility model comprises switch voltage-stabilizing adjuster (LM2596), control switch Q1, pressurizer (78L05), Schottky diode D6, general-purpose diode D5 and linear voltage regulator (LM1117).
When television set was in holding state, control switch received high level signal from external signal input end (ON/OFF), and the control switch voltage regulation adjustor quits work, and this moment, the power consumption of switch voltage-stabilizing adjuster LM2596 was 0.From external power adapter input+12V voltage converts to+5V voltage through pressurizer 78L05, exports to linear voltage regulator LM1117, input+5V voltage is transferred to linear voltage regulator LM1117 through diode D6 and converts to+voltage of 3.3V, export.The about 50MA of electric current this moment, the about 0.4W of overall power, the minimum power consumption requirement when having reached standby.
After the start, the electric current that standby partly needs increases to 200MA, needs the power consumption of about 1.5W, and this moment, pressurizer 78L05 can't provide needed electric current and power consumption.Control switch receives low level signal from external signal input end (ON/OFF), and the control switch voltage regulation adjustor is started working.Power-switching circuit connect to external power adapter input+12V voltage changes output+5V-SW voltage, + 5V-SW voltage outputs to linear voltage regulator LM1117 through Schottky diode D5, and linear voltage regulator LM1117 will import+and 5V-SW voltage transitions one-tenth+3.3V voltage exports.Because the pressure drop of Schottky diode itself has only about 0.4V, and the pressure drop of general-purpose diode has 0.7V.Therefore, the virtual voltage of the input node of linear voltage regulator LM1117 is 5-0.4=4.6V at this moment, surpass 5-0.7=4.11V through diode D6 input, therefore pressurizer 78L05 will end to the circuit of linear voltage regulator LM1117, no longer work, all power consumptions of this moment are produced by switch voltage-stabilizing adjuster and linear voltage regulator LM1117, have reduced power consumption, when having satisfied operate as normal simultaneously to the requirement of power output.
The control switch that adopts in the middle of the utility model is triode Q1, the b utmost point of triode Q1 is connected with external control signal, e utmost point ground connection, the controlled pin of the c utmost point and switch voltage-stabilizing adjuster link to each other and the pull-up resistor by 10K with external on draw voltage (employing+5V voltage in the present embodiment) to be connected.Triode conducting when the control signal of input is high level, the control switch voltage regulation adjustor is started working; Triode ends when the control signal of input is low level, and the control switch voltage regulation adjustor quits work.
In the middle of concrete enforcement, the switch voltage-stabilizing adjuster and+the 5V-SW voltage output end between, linear voltage regulator and+be connected with electric capacity of voltage regulation between the 3.3V voltage output end.
Television set voltage stabilizing circuit of the present utility model has increased pressurizer, control switch and two dissimilar diodes, utilize the voltage regulator work of control switch control switch or quit work, switch voltage-stabilizing adjuster generation+5V voltage is transferred to linear voltage regulator output standby voltage through diode when television boot-strap, the switch voltage-stabilizing adjuster quits work during standby, by pressurizer generation+5V voltage, reduced the cost of stand-by circuit when reducing the stand-by circuit power consumption; Two dissimilar diodes make the electric current can be according to setting conducting or ending under different operating states, make holding state and the operating state can be by differentiated treatment, reach the designing requirement on electric.
The above only is preferred embodiment of the present utility model; not in order to restriction the utility model; all any modifications of within spirit of the present utility model and principle, being done, be equal to and replace and improvement etc., all should be included within the protection range of the present utility model.
Claims (4)
1. a television set stand-by circuit comprises regulator, is connected generation+5V voltage with external+12V voltage, it is characterized in that described circuit also comprises:
Control switch with described regulator, connect and draw voltage and external control signal to be connected, is controlled the work of described regulator outward;
Pressurizer is connected generation+5V voltage with external+12V voltage;
General-purpose diode and Schottky diode are connected with described regulator and described pressurizer respectively, general-purpose diode conducting when external control signal control switch voltage regulator quits work; General-purpose diode ends the Schottky diode conducting when external control signal control switch voltage regulator is worked; And
Linear voltage regulator is connected with described general-purpose diode and Schottky diode, with input+the 5V voltage transitions becomes standby voltage to export.
2. television set stand-by circuit as claimed in claim 1 is characterized in that, described control switch is a triode, and the b utmost point of described triode is connected with external control signal, e utmost point ground connection, the controlled pin of the c utmost point and regulator and external on draw voltage to be connected.
3. television set stand-by circuit as claimed in claim 1 is characterized in that, described switch voltage-stabilizing adjuster and+the 5V voltage output end between, be connected with electric capacity of voltage regulation between linear voltage regulator and the standby voltage output end.
4. television set stand-by circuit as claimed in claim 1 is characterized in that, described outer connect to draw between the voltage input end and the triode c utmost point be connected with resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201196594U CN201072874Y (en) | 2007-04-20 | 2007-04-20 | Standby circuit of television |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201196594U CN201072874Y (en) | 2007-04-20 | 2007-04-20 | Standby circuit of television |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201072874Y true CN201072874Y (en) | 2008-06-11 |
Family
ID=39551427
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201196594U Expired - Fee Related CN201072874Y (en) | 2007-04-20 | 2007-04-20 | Standby circuit of television |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201072874Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102111595B (en) * | 2009-12-29 | 2014-12-10 | 康佳集团股份有限公司 | Central processing unit (CPU) supply circuit equipment |
| CN104467421A (en) * | 2014-12-12 | 2015-03-25 | 柳州铁道职业技术学院 | Switching power source based on switch voltage stabilizing type integrated circuit |
-
2007
- 2007-04-20 CN CNU2007201196594U patent/CN201072874Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102111595B (en) * | 2009-12-29 | 2014-12-10 | 康佳集团股份有限公司 | Central processing unit (CPU) supply circuit equipment |
| CN104467421A (en) * | 2014-12-12 | 2015-03-25 | 柳州铁道职业技术学院 | Switching power source based on switch voltage stabilizing type integrated circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080611 Termination date: 20100420 |