CN104038713A - Reverse current preventing device and set top box - Google Patents
Reverse current preventing device and set top box Download PDFInfo
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- CN104038713A CN104038713A CN201410280954.2A CN201410280954A CN104038713A CN 104038713 A CN104038713 A CN 104038713A CN 201410280954 A CN201410280954 A CN 201410280954A CN 104038713 A CN104038713 A CN 104038713A
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Abstract
The invention relates to a reverse current preventing device and a set top box. The reverse current preventing device comprises a power supply input end, a power supply output end and a control unit, wherein the control unit is connected with the power supply input end and the power supply output end, and the control unit comprises a control end, a first resistor, a first audion, a second resistor and a second audion. According to the reverse current preventing device, the two audions are connected, and the connection and disconnection of the first audio and the second audion are controlled by size of potential at the control end, thus being capable of controlling the power supply input end to supply power to the power supply output end, and also effectively preventing reverse current from the power supply output end to the power supply input end; the reverse current preventing device is simple in design, greatly reduced in cost, and shortened in development cycle, and thereby cost and development cycle of products are greatly reduced, and development of products and enterprises is promoted.
Description
Technical field
The present invention relates to electronic applications, relate in particular to a kind of backward flowing preventing device and Set Top Box.
Background technology
In the epoch of science and technology competition, cost is pressure and the power of enterprise development.Enterprise need to complete competitive science and technology under the pressure of least cost in the shortest time, thereby makes cost minimization, shortest time, and maximizing the benefits, has increased enterprise competitiveness, reduces cost and pays, and improves the quality of products.
In now a lot of electronic products, for product is protected, be all designed with backward flowing preventing device.But its circuit result of existing backward flowing preventing device is all very complicated, and cost is high, the development time is long, is not suitable for very much household appliances cheaply and uses, particularly Set Top Box industry, this has just improved cost and the construction cycle of product greatly, has limited the development of product and enterprise.
Summary of the invention
In view of this, be necessary, for above-mentioned backward flowing preventing device complex structure, problem that cost is high, to provide a kind of backward flowing preventing device.
In addition, also provide a kind of Set Top Box that uses above-mentioned backward flowing preventing device.
The invention provides a kind of backward flowing preventing device, comprising: power input, power output end and control unit, described control unit connects described power input and power output end, described control unit comprises control end, the first resistance, the first triode, the second resistance and the second triode, described control end connects described first resistance one end, the described first resistance other end connects the base stage of described the first triode, the emitter of described the first triode connects ground, collector electrode connects one end of described the second resistance, the described second resistance other end connects the base stage of described the second triode, the emitter of described the second triode connects described power input, collector electrode connects described power output end, when described control end is high level, described the first triode conducting, and described control the second triode conducting, when described control end is low level, described the first triode cut-off, and control described the second triode and end.
The present invention also provides a kind of Set Top Box, comprising: power supply, HDMI interface and backward flowing preventing device, described backward flowing preventing device connects described power supply and HDMI interface, described backward flowing preventing device comprises power input, power output end and control unit, described power input one end connects power supply, described power output end one end connects described HDMI interface, described control unit connects the described power input other end and the power output end other end, described control unit comprises control end, the first resistance, the first triode, the second resistance and the second triode, described control end connects described first resistance one end, the described first resistance other end connects the base stage of described the first triode, the emitter of described the first triode connects ground, collector electrode connects one end of described the second resistance, the described second resistance other end connects the base stage of described the second triode, the emitter of described the second triode connects the described power input other end, collector electrode connects the described power output end other end, when described control end is high level, described the first triode conducting, and described control the second triode conducting, when described control end is low level, described the first triode cut-off, and control described the second triode and end.
Backward flowing preventing device of the present invention and Set Top Box, utilize two triodes to be connected, control conducting and the cut-off of the first triode and the second triode by control end current potential height, can control power input and power to power output end, can effectively prevent that again power output end from pouring in down a chimney to power input, simplicity of design, greatly reduce costs, shorten the construction cycle, thereby greatly reduce cost and the construction cycle of product, promote the development of product and enterprise.
Brief description of the drawings
Fig. 1 is the structure chart of a backward flowing preventing device in embodiment;
Fig. 2 is the structure chart of a Set Top Box in embodiment;
Fig. 3 is the concrete structure figure of a Set Top Box in embodiment.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Be illustrated in figure 1 the structure chart of backward flowing preventing device.As shown in Figure 1, this backward flowing preventing device project organization is simple, and cost is low, and the construction cycle is very short, specifically comprises: power input 100, power output end 200 and control unit 300.Control unit 300 connects power input 100 and power output end 200, powers, and prevent that power output end 200 from pouring in down a chimney to power input 100 for controlling power input 100 to power output end 200.Control unit 300 comprises control end 310, the first resistance R 1, the first triode Q1, the second resistance R 2 and the second triode Q2.Control end 310 connects first resistance R 1 one end, first resistance R 1 other end connects the base stage (the B utmost point) of the first triode Q1, the emitter (the E utmost point) of the first triode Q1 connects one end of ground, collector electrode (the C utmost point) connection the second resistance R 2, second resistance R 2 other ends connect the base stage of the second triode Q2, and the emitter of the second triode Q2 connects power input 100, collector electrode connects power output end 200.When control end 310 is high level, the first triode Q1 conducting, and control the second triode Q2 conducting, power input 100 can be powered to power output end 200.When control end 310 is low level, the first triode Q1 cut-off, and control the second triode Q2 cut-off, power input 100 can not be powered to power output end 200, and power output end 200 can not pour in down a chimney to power input 100, thereby by adjusting the current potential height of control end 310, can control power input 100 and power to power output end 200, can prevent that again power output end 200 from pouring in down a chimney to power input 100, and simplicity of design, thereby greatly reduce costs, shorten the construction cycle.
For accurately controlling Power supply and whole circuit being protected; each device parameters is controlled; in this embodiment; the first resistance R 1 resistance is 10K ohm; the second resistance is 1K ohm; power input 100 input supply voltages are 5V, and power output end 200 output supply voltages are 5V.
In further execution mode, for output voltage is effectively protected and adjusted to power input 100 and power output end 200, control unit 300 also comprises the 3rd resistance R 3 and the 4th resistance R 4.The 3rd resistance R 3 one end connect power input 100, other end ground connection.The 4th resistance R 4 one end connect power output end 200, other end ground connection.By adjusting the resistance size of the 3rd resistance R 3 and the 4th resistance R 4, can control the voltage ratio size of power input 100 and power output end 200.Preferably, the 3rd resistance R 3 is identical with the 4th resistance R 4 resistances, even if power input 100 is 1:1 with the ratio of power output end 200.Further, the 3rd resistance R 3 and the 4th resistance R 4 resistances are 100 ohm.
This backward flowing preventing device, utilize two triodes to be connected, control conducting and the cut-off of the first triode Q1 and the second triode Q2 by control end current potential height, can control power input 100 and power to power output end 200, can effectively prevent that again power output end 200 from pouring in down a chimney to power input 100, simplicity of design, greatly reduce costs, shorten the construction cycle, thereby greatly reduce cost and the construction cycle of product, promote the development of product and enterprise.
Meanwhile, the present invention also provides a kind of Set Top Box.As shown in Figure 2, this Set Top Box comprises power supply, backward flowing preventing device 10 and HDMI interface 20.Backward flowing preventing device 10 connects power supply and HDMI interface 20.This Set Top Box, compared with conventional set-top box, is provided with backward flowing preventing device 10 between power supply and HDMI interface 20, for power supply and HDMI interface 20 are protected.
Shown in Fig. 3, backward flowing preventing device 10 project organizations are simple, and cost is low, and the construction cycle is very short, specifically comprises: power input 100, power output end 200 and control unit 300.Power input 100 one end connect power supply, power output end 200 one end connect HDMI interface 20, control unit 300 connects power input 100 other ends and power output end 200 other ends, be used for controlling power input 100 and power to power output end 200, and prevent that power output end 200 from pouring in down a chimney to power input 100.Control unit 300 comprises control end 310, the first resistance R 1, the first triode Q1, the second resistance R 2 and the second triode Q2.Control end 310 connects first resistance R 1 one end, first resistance R 1 other end connects the base stage (the B utmost point) of the first triode Q1, the emitter (the E utmost point) of the first triode Q1 connects one end of ground, collector electrode (the C utmost point) connection the second resistance R 2, second resistance R 2 other ends connect the base stage of the second triode Q2, and the emitter of the second triode Q2 connects power input 100 other ends, collector electrode connects power output end 200 other ends.When control end 310 is high level (Set Top Box is in normal operating conditions), the first triode Q1 conducting, and control the second triode Q2 conducting, power input 100 can be powered to power output end 200, can power for HDMI interface 20.When control end 310 is low level (Set Top Box is in standby or off-mode), the first triode Q1 cut-off, and control the second triode Q2 and end, power input 100 can not be powered to power output end 200, can not power for HDMI interface 20, and power output end 200 can not pour in down a chimney to power input 100, thereby by adjusting the current potential height of control end 310, can control power input 100 powers to power output end 200 and HDMI interface 20, can prevent that again power output end 200 from pouring in down a chimney to power input 100, and simplicity of design, thereby greatly reduce costs, shorten the construction cycle.
For accurately controlling Power supply and whole circuit being protected; each device parameters is controlled; in this embodiment; the first resistance R 1 resistance is 10K ohm; the second resistance is 1K ohm; power input 100 input supply voltages are 5V, and power output end 200 output supply voltages are 5V.
In further execution mode, for output voltage is effectively protected and adjusted to power input 100 and power output end 200, control unit 300 also comprises the 3rd resistance R 3 and the 4th resistance R 4.The 3rd resistance R 3 one end connect power input 100 other ends, other end ground connection.The 4th resistance R 4 one end connect power output end 200 other ends, other end ground connection.By adjusting the resistance size of the 3rd resistance R 3 and the 4th resistance R 4, can control the voltage ratio size of power input 100 and power output end 200.Preferably, the 3rd resistance R 3 is identical with the 4th resistance R 4 resistances, even if power input 100 is 1:1 with the ratio of power output end 200.Further, the 3rd resistance R 3 and the 4th resistance R 4 resistances are 100 ohm.
This Set Top Box; adopt the power supply of backward flowing preventing device 10 protection power sources to HDMI interface 20; backward flowing preventing device 10 utilizes two triodes to be connected; control conducting and the cut-off of the first triode Q1 and the second triode Q2 by control end current potential height; can control power input 100 powers to power output end 200; can effectively prevent that again power output end 200 from pouring in down a chimney to power input 100; simplicity of design; greatly reduce costs; shorten the construction cycle; thereby greatly reduce cost and the construction cycle of product, promote the development of product and enterprise.
Backward flowing preventing device of the present invention and Set Top Box, utilize two triodes to be connected, control conducting and the cut-off of the first triode and the second triode by control end current potential height, can control power input and power to power output end, can effectively prevent that again power output end from pouring in down a chimney to power input, simplicity of design, greatly reduce costs, shorten the construction cycle, thereby greatly reduce cost and the construction cycle of product, promote the development of product and enterprise.
These are only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. a backward flowing preventing device, is characterized in that, comprising: power input, power output end and control unit, described control unit connects described power input and power output end, described control unit comprises control end, the first resistance, the first triode, the second resistance and the second triode, described control end connects described first resistance one end, the described first resistance other end connects the base stage of described the first triode, the emitter of described the first triode connects ground, collector electrode connects one end of described the second resistance, the described second resistance other end connects the base stage of described the second triode, the emitter of described the second triode connects described power input, collector electrode connects described power output end, when described control end is high level, described the first triode conducting, and described control the second triode conducting, when described control end is low level, described the first triode cut-off, and control described the second triode and end.
2. backward flowing preventing device according to claim 1, is characterized in that, described the first resistance is 10K ohm, and the second resistance is 1K ohm.
3. backward flowing preventing device according to claim 1, is characterized in that, described power input input supply voltage is 5V, and described power output end output supply voltage is 5V.
4. backward flowing preventing device according to claim 1, is characterized in that, described control unit also comprises the 3rd resistance and the 4th resistance; Described the 3rd resistance one end connects described power input, other end ground connection, and described the 4th resistance one end connects described power output end, other end ground connection.
5. backward flowing preventing device according to claim 4, is characterized in that, described the 3rd resistance and the 4th resistance are 100 ohm.
6. a Set Top Box, is characterized in that, comprising: power supply, HDMI interface and backward flowing preventing device, described backward flowing preventing device connects described power supply and HDMI interface, described backward flowing preventing device comprises power input, power output end and control unit, described power input one end connects power supply, described power output end one end connects described HDMI interface, described control unit connects the described power input other end and the power output end other end, described control unit comprises control end, the first resistance, the first triode, the second resistance and the second triode, described control end connects described first resistance one end, the described first resistance other end connects the base stage of described the first triode, the emitter of described the first triode connects ground, collector electrode connects one end of described the second resistance, the described second resistance other end connects the base stage of described the second triode, the emitter of described the second triode connects the described power input other end, collector electrode connects the described power output end other end, when described control end is high level, described the first triode conducting, and described control the second triode conducting, when described control end is low level, described the first triode cut-off, and control described the second triode and end.
7. Set Top Box according to claim 6, is characterized in that, described the first resistance is 10K ohm, and the second resistance is 1K ohm.
8. Set Top Box according to claim 6, is characterized in that, described power input input supply voltage is 5V, and described power output end output supply voltage is 5V.
9. Set Top Box according to claim 6, is characterized in that, described control unit also comprises the 3rd resistance and the 4th resistance; Described the 3rd resistance one end connects the described power input other end, other end ground connection, and described the 4th resistance one end connects the described power output end other end, other end ground connection.
10. Set Top Box according to claim 9, is characterized in that, described the 3rd resistance and the 4th resistance are 100 ohm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410280954.2A CN104038713A (en) | 2014-06-20 | 2014-06-20 | Reverse current preventing device and set top box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410280954.2A CN104038713A (en) | 2014-06-20 | 2014-06-20 | Reverse current preventing device and set top box |
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| CN104038713A true CN104038713A (en) | 2014-09-10 |
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| CN201410280954.2A Pending CN104038713A (en) | 2014-06-20 | 2014-06-20 | Reverse current preventing device and set top box |
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| CN201156773Y (en) * | 2008-01-29 | 2008-11-26 | 深圳市同洲电子股份有限公司 | Electronic apparatus having HDMI/USB interface and interface circuit |
| CN101345520A (en) * | 2008-08-20 | 2009-01-14 | 启攀微电子（上海）有限公司 | Anti-back flow circuit |
| CN202334466U (en) * | 2011-12-09 | 2012-07-11 | 重庆电子工程职业学院 | Change-over switch circuit |
| US20130063106A1 (en) * | 2011-09-13 | 2013-03-14 | Ricoh Company, Ltd. | Dc-dc converter control circuit and dc-dc converter including same |
| CN103297032A (en) * | 2013-05-31 | 2013-09-11 | 成都锐奕信息技术有限公司 | Anti-backflow circuit of multiplex interface |
| JP2013247746A (en) * | 2012-05-24 | 2013-12-09 | Semiconductor Components Industries Llc | Charge control circuit and charging circuit |
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2014
- 2014-06-20 CN CN201410280954.2A patent/CN104038713A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201156773Y (en) * | 2008-01-29 | 2008-11-26 | 深圳市同洲电子股份有限公司 | Electronic apparatus having HDMI/USB interface and interface circuit |
| CN101345520A (en) * | 2008-08-20 | 2009-01-14 | 启攀微电子（上海）有限公司 | Anti-back flow circuit |
| US20130063106A1 (en) * | 2011-09-13 | 2013-03-14 | Ricoh Company, Ltd. | Dc-dc converter control circuit and dc-dc converter including same |
| CN202334466U (en) * | 2011-12-09 | 2012-07-11 | 重庆电子工程职业学院 | Change-over switch circuit |
| JP2013247746A (en) * | 2012-05-24 | 2013-12-09 | Semiconductor Components Industries Llc | Charge control circuit and charging circuit |
| CN103297032A (en) * | 2013-05-31 | 2013-09-11 | 成都锐奕信息技术有限公司 | Anti-backflow circuit of multiplex interface |
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Application publication date: 20140910 |