CN101370110B - Power control unit and method for high-definition multimedia interface - Google Patents
Power control unit and method for high-definition multimedia interface Download PDFInfo
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- CN101370110B CN101370110B CN2007101387416A CN200710138741A CN101370110B CN 101370110 B CN101370110 B CN 101370110B CN 2007101387416 A CN2007101387416 A CN 2007101387416A CN 200710138741 A CN200710138741 A CN 200710138741A CN 101370110 B CN101370110 B CN 101370110B
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Abstract
This invention is a power supply control device and method for high definition multimedia interface (HDMI), which can save electricity and avoid the problem of the technical background. The power supply control device includes a voltage generating unit and a sensing unit. The voltage generating unit generates one of a first voltage value and a second voltage value at an output end based on a control signal. The output end is coupled to a power supply pin of the high definition multimedia interface. The second voltage value is in accordance with a supply voltage of the high definition multimedia interface. The sensing unit with an input end senses whether the voltage value of the input end is not smaller than a threshold voltage value so as to generate the control signal. The input end is coupled to a hot plug sensing pin of the high definition multimedia interface. And the threshold voltage value is in accordance with the first voltage value.
Description
Technical field
What the present invention relates to is a kind of HDMI (High Definition Multimedia Interface) (High-Definition MultimediaInterface is called for short HDMI), refers to a kind of power control and method that is useful in HDMI (High Definition Multimedia Interface) especially.
Background technology
HDMI (High Definition Multimedia Interface) (High-definition Multimedia Interface, HDMI) be at the designed transmission terminal of multimedia video equipment of new generation, be useful in digital household appliances Digital Television, DVD projector, DVD videocorder, individual video recording machine (personal video recorder, PVR), set-top box (Set-top Box) and other digital audio-video commodity.HDMI interface greatest feature is to integrate image signal and sound signal together transmits, and is different with the audio-visual separated transmission of tradition, and HDMI also adopts the digital data transfer of non-compression, can effectively reduce the signal that is caused in numeral and the analog-converted and disturb and decay.
In the standard of HDMI interface, the HDMI interface has a power supply pin, this power supply pin provides positive five volts power supply, in the electronic installation that generally has the HDMI interface, when the power supply that is originally had when electronic installation is not positive five volts, just must carry out voltage transitions, with extremely positive five volts of original power source conversion, even electronic installation is not connected to external device.Yet, carry out the loss that this voltage transitions can produce electric power.Particularly, when the power supply of electronic installation is battery, similarly be portable electronic devices, as mobile phone, digital player (digital player), mobile computer etc., this kind power consumption also can make the electric power of battery exhaust soon, and has a strong impact on the service time of electronic installation.
Summary of the invention
In view of this, a purpose of the present invention is to provide a kind of power control and method that is used in HDMI (High Definition Multimedia Interface), can save electric power, to avoid the problem of background technology.
The present invention discloses a kind of power control that is used in HDMI (High Definition Multimedia Interface), it comprises: a voltage generation unit, in order to according to a controlling signal, produce one of first magnitude of voltage and second magnitude of voltage at an output, wherein, described output is coupled to the power supply pin of HDMI (High Definition Multimedia Interface), and second magnitude of voltage is corresponding to a supply voltage of HDMI (High Definition Multimedia Interface); An and detecting unit, has an input, and detect the magnitude of voltage of described input and the magnitude relationship between a critical voltage value, to produce described controlling signal, wherein, described input is coupled to the hot plug detecting pin position of HDMI (High Definition Multimedia Interface), and described critical voltage value is corresponding to first magnitude of voltage.
The present invention discloses a kind of power control method that is used in HDMI (High Definition Multimedia Interface) in addition, and it comprises: whether the magnitude of voltage of the hot plug detecting pin position of detecting HDMI (High Definition Multimedia Interface) is not less than a critical voltage value, to produce a controlling signal; And according to a power supply and described controlling signal, power supply pin in HDMI (High Definition Multimedia Interface) produces one of first magnitude of voltage and second magnitude of voltage, wherein second magnitude of voltage is corresponding to a supply voltage of HDMI (High Definition Multimedia Interface), and described critical voltage value is corresponding to first magnitude of voltage.
Description of drawings
Figure 1A is according to one embodiment of the invention, shows the calcspar of the power control that is used in the HDMI interface;
Figure 1B is according to a preferred embodiment of the present invention, shows the calcspar of the power control that is used in the HDMI interface;
Fig. 1 C is according to another preferred embodiment of the present invention, shows the calcspar of the power control that is used in the HDMI interface;
Fig. 2 A and Fig. 2 B show that the power control of 1B figure is connected to the schematic diagram of external device via the HDMI connector;
Fig. 3 is the flow chart of an embodiment of the power control method of the HDMI of being used in interface of the present invention.
Description of reference numerals: 1a, 1b, 1c-portable electronic devices; 10a, 10b, 10c-power control; 11a, 11b, 1c-voltage generation unit; The 111-output; The 112-DC-DC converter; The 113-multiplexer; 114-separates multiplexer; The 12-detecting unit; The 121-input; The 13-HDMI connector; The 14-power supply; The flow process of one embodiment of 30～31-power control method.
Embodiment
Below in conjunction with accompanying drawing, be described in more detail with other technical characterictic and advantage the present invention is above-mentioned.
Figure 1A is according to one embodiment of the invention, the calcspar that shows the power control 10a that is used in the HDMI interface, wherein, power control 10a is used among the portable electronic devices 1a, such as but not limited to mobile phone, digital player, mobile computer, numeral action assistant (PDA) etc.Portable electronic devices 1a can be connected to external device via a HDMI connector 13, as numeric display units such as digital projector, plasma-screen television, LCD TV, to present the digital audio-video signal of the HDMI specification that portable electronic devices 1 exported.Power control 10a comprises a voltage generation unit 11a and a detecting unit 12.Voltage generation unit 11a couples the power supply 14 that portable electronic devices 1a is provided, battery for example, and the controlling signal that is produced according to detecting unit 12, an output 111 produce first magnitudes of voltage and second magnitude of voltage one of them.Output 111 is coupled to the power supply pin of a HDMI connector 13, and second magnitude of voltage is corresponding to the supply voltage of HDMI interface.With existing HDMI specification, described power supply pin is that (+5VPower) pin position, described supply voltage is five volts to positive five volts of power supplys.
Detecting unit 12 has an input 121, and whether the magnitude of voltage that detecting unit 12 can be detected input 121 is not less than a critical voltage value, delivers to voltage generation unit 11a to produce aforesaid controlling signal.Input 121 is coupled to the hot plug detecting pin position of HDMI connector 13, and described critical voltage value is corresponding to first magnitude of voltage.When the magnitude of voltage that detects input 121 when detecting unit 12 is not less than described critical voltage value, can produce described controlling signal, 11a produces second magnitude of voltage at output 111 with control voltage generation unit; And the magnitude of voltage that detects input 121 when detecting unit 12 can produce described controlling signal during less than described critical voltage value, and 11a produces first magnitude of voltage at output 111 with control voltage generation unit.
Figure 1B is according to a preferred embodiment of the present invention, shows the calcspar of the power control 10b be used in the HDMI interface, and wherein voltage generation unit 11b comprises and flow to a direct current transducer 112 and a multiplexer 113 always.DC-DC converter 112 can be according to the controlling signal of detecting unit 12 generations, optionally the magnitude of voltage of the power supply 14 that portable electronic devices 1b is provided is converted to second magnitude of voltage, 113 of multiplexers are according to the controlling signal that detecting unit 12 produces, the magnitude of voltage of selecting out-put supply 14 and second magnitude of voltage of DC-DC converter 112 generations one of them.In other words, voltage generation unit 11b be directly with the magnitude of voltage of power supply 14 as first magnitude of voltage.
Fig. 1 C is according to another preferred embodiment of the present invention, shows the calcspar of the power control 10c be used in the HDMI interface, and wherein voltage generation unit 11c comprises DC-DC converter 112 and and separates multiplexer 114.Separate the controlling signal that multiplexer 114 produces according to detecting unit 12, the magnitude of voltage of the power supply 14 that portable electronic devices 1c is provided exports HDMI connector 13 and DC-DC converter 112 both one of them to.When separating multiplexer 114 and select to export HDMI connector 13 to, the magnitude of voltage of power supply 14 is first magnitude of voltage; When selecting to export direct current transducer 112 to, DC-DC converter 112 can be converted to second magnitude of voltage with the magnitude of voltage of power supply 14, delivers to HDMI connector 13 via output 111 again.In the preferred embodiment of Figure 1B and Fig. 1 C, second magnitude of voltage is the supply voltage of HDMI interface, and first magnitude of voltage is less than second magnitude of voltage, and critical voltage value then can be made as less than first magnitude of voltage.
Fig. 2 A and Fig. 2 B show that the power control 10b of Figure 1B is connected to the schematic diagram of an external device 2 via HDMI connector 13.Among Fig. 2 A, HDMI connector 13 is not connected to external device 2 as yet, and the hot plug detecting pin position that the input 121 of voltage generation unit 11b is coupled does not form the loop as yet, is that input 121 is suspension joint (floating) yet.At this moment, detecting unit 12 detects the magnitude of voltage of input 121 less than critical voltage value, therefore the controlling signal that is produced can be controlled voltage generation unit 11b and produce first magnitude of voltage, also be, DC-DC converter 112 is not carried out the action of voltage transitions, with saving electric power, and multiplexer 113 can directly be chosen the magnitude of voltage output of power supply 14.Among Fig. 2 B, HDMI connector 13 has been connected to external device 2, standard according to the HDMI standard, the power supply pin of HDMI connector 13 and hot plug detecting pin position can form the loop with the HDMI jockey (not illustrating) in the external device 2, also are that the output 111 of voltage generation unit 11b can form a loop with input 121 with external device 2 via HDMI connector 13.At this moment, first magnitude of voltage of output 111 outputs is after delivering to input 121 via described loop, the magnitude of voltage that detecting unit 12 can detect input 121 has been not less than critical voltage value, and then the generation controlling signal changes generation second magnitude of voltage into control voltage generation unit 11b, also be, DC-DC converter 112 can be converted to five volts second magnitude of voltage with the magnitude of voltage of power supply 14, chooses output via multiplexer 113, to meet the standard at HDMI interface.On the other hand, detecting unit 12 also can start the HDMI function of portable electronic devices 1b, to begin transmitting the digital audio-video signal of HDMI specification to external device 2.So, just the power saving effect can be when not using the HDMI interface, reached on the one hand, the standard of HDMI interface can be when using the HDMI interface, met on the other hand again.
In the application of reality, when the HDMI of Fig. 2 B connector 13 with after external device 2 is connected, first magnitude of voltage of output 111 output is when delivering to input 121 with external device 2 formed loops, pressure drop slightly may be arranged, therefore the critical voltage value of detecting unit 12 must be designed to less than first magnitude of voltage, and its amplitude less than first magnitude of voltage must be greater than this pressure drop, when HDMI connector 13 with after external device 2 is connected, detecting unit 12 can judge that just the magnitude of voltage of input 121 is not less than critical voltage value.
Among Fig. 1 C, when power control 10c is not connected to external device as yet, input 121 is a suspension joint, thereby detecting unit 12 detects the magnitude of voltage of input 121 less than critical voltage value, therefore the controlling signal that is produced can be controlled voltage generation unit 11c and produce first magnitude of voltage, also be, separating multiplexer 114 can be according to described controlling signal, directly export the magnitude of voltage of power supply 14 to HDMI connector 13 via output 111, DC-DC converter 112 is not then carried out the action of voltage transitions, to save electric power.On the other hand, when power control 10c is connected to external device, output 111 can form a loop via HDMI connector 13 and external device with input 121, and first magnitude of voltage of output 111 output originally is when delivering to input 121 via described loop, detecting unit 12 can judge that the magnitude of voltage of input 121 is not less than critical voltage value, change generation second magnitude of voltage and produce controlling signal into control voltage generation unit 11c, also be, separating multiplexer 114 can be according to described controlling signal, the magnitude of voltage of power supply 14 is selected to export to DC-DC converter 112, be converted to five volts second magnitude of voltage with magnitude of voltage with power supply 14, export external device to via HDMI connector 13 again, to meet the standard of HDMI interface.Similarly, detecting unit 12 also can start the HDMI function of portable electronic devices 1c, to begin transmitting the digital audio-video signal of HDMI specification to external device.So, just the power saving effect can be when not using the HDMI interface, reached on the one hand, the standard of HDMI interface can be when using the HDMI interface, met on the other hand again.
In one embodiment, power control 1a, 1b and 1c are incorporated in the integrated circuit (IC).In another embodiment, among power control 1b and the 1c, detecting unit 12 is to be incorporated among the IC, voltage generation unit 11b and 11c then be embodied in described IC outside.
Fig. 3 is the flow chart of an embodiment of the power control method of the HDMI of being used in interface of the present invention.Described power control method can be used on the portable electronic devices with HDMI interface.Described power control method comprises the following step:
Step 30: whether the magnitude of voltage of the hot plug detecting pin position of detecting HDMI interface is not less than a critical voltage value, to produce a controlling signal.
Step 31: according to a power supply and described controlling signal, the power supply pin of HDMI interface produce first magnitude of voltage and second magnitude of voltage one of them, wherein second magnitude of voltage is corresponding to the supply voltage of HDMI interface, and described critical voltage value is corresponding to first magnitude of voltage.
In the step 31, described power supply can be battery.When the magnitude of voltage that detects described hot plug detecting pin position when step 30 was not less than critical voltage value, step 31 selected to produce second magnitude of voltage; The magnitude of voltage that detects described hot plug detecting pin position when step 30 is during less than critical voltage value, and then step 31 selects to produce first magnitude of voltage.
In a preferred embodiment, step 31 directly with described power source voltage value as first magnitude of voltage, and according to described controlling signal, optionally described power source voltage value is converted to second magnitude of voltage, also be, when the magnitude of voltage that detects described hot plug detecting pin position when step 30 was not less than critical voltage value, step 31 was carried out voltage transitions, to produce second magnitude of voltage; And the magnitude of voltage that detects described hot plug detecting pin position when step 30 is during less than critical voltage value, and then step 31 is not carried out voltage transitions, to save electric power.
The above only is preferred embodiment of the present invention, only is illustrative for the purpose of the present invention, and nonrestrictive.Those skilled in the art is understood, and can carry out many changes to it in the spirit and scope that claim of the present invention limited, revise, even equivalence, but all will fall within the scope of protection of the present invention.
Claims (15)
1. power control that is used in a HDMI (High Definition Multimedia Interface) is characterized in that: comprise:
One voltage generation unit, in order to according to a controlling signal, produce one of one first magnitude of voltage and one second magnitude of voltage at an output, wherein, described output is a power supply pin that is coupled to described HDMI (High Definition Multimedia Interface), and described second magnitude of voltage is corresponding to a supply voltage of described HDMI (High Definition Multimedia Interface); And
One detecting unit, has an input, in order to the magnitude of voltage of detecting described input and the magnitude relationship between a critical voltage value, to produce described controlling signal, wherein, described input is the hot plug detecting pin position that is coupled to described HDMI (High Definition Multimedia Interface), and described critical voltage value is corresponding to described first magnitude of voltage.
2. the power control that is used in a HDMI (High Definition Multimedia Interface) according to claim 1, it is characterized in that: when the magnitude of voltage that detects described input when described detecting unit is not less than described critical voltage value, described voltage generation unit produces described second magnitude of voltage according to described controlling signal at described output, and the magnitude of voltage that detects described input when described detecting unit is during less than described critical voltage value, and described voltage generation unit produces described first magnitude of voltage according to described controlling signal at described output.
3. power control according to claim 1, it is characterized in that: described power control is to be used in a portable electronic devices with described HDMI (High Definition Multimedia Interface), and described voltage generation unit is a power supply that is coupled to described portable electronic devices.
4. power control according to claim 3 is characterized in that: described voltage generation unit with a magnitude of voltage of described power supply as described first magnitude of voltage.
5. power control according to claim 3 is characterized in that: described voltage generation unit comprises:
Flow to direct current transducer always, be converted to described second magnitude of voltage in order to a magnitude of voltage with described power supply.
6. power control according to claim 5 is characterized in that: described DC-DC converter is according to described controlling signal, and optionally the described magnitude of voltage with described power supply is converted to described second magnitude of voltage.
7. power control according to claim 5 is characterized in that: described voltage generation unit also comprises:
One multiplexer is coupled to described power supply and described DC-DC converter, in order to according to described controlling signal, exports one of the described magnitude of voltage of described power supply and described second magnitude of voltage.
8. power control according to claim 5 is characterized in that: described voltage generation unit also comprises:
One separates multiplexer, is coupled between described power supply and the described DC-DC converter, and in order to according to described controlling signal, the described magnitude of voltage of exporting described power supply is to one of described output and described DC-DC converter.
9. power control according to claim 1 is characterized in that: described detecting unit is to be incorporated in the integrated circuit, and described voltage generation unit is to be positioned at outside the described integrated circuit.
10. power control according to claim 1 is characterized in that: described power control is to be incorporated in the integrated circuit.
11. a power control method that is used in a HDMI (High Definition Multimedia Interface) is characterized in that: comprise the following step:
Whether the magnitude of voltage of detecting the hot plug detecting pin position of described HDMI (High Definition Multimedia Interface) is not less than a critical voltage value, to produce a controlling signal; And
According to a power supply and described controlling signal, power supply pin in described HDMI (High Definition Multimedia Interface) produces one of one first magnitude of voltage and one second magnitude of voltage, wherein said second magnitude of voltage is corresponding to a supply voltage of described HDMI (High Definition Multimedia Interface), and described critical voltage value is corresponding to described first magnitude of voltage.
12. power control method according to claim 11 is characterized in that: described first magnitude of voltage is less than described second magnitude of voltage.
13. power control method according to claim 11 is characterized in that: described power control method is used in a portable electronic devices with described HDMI (High Definition Multimedia Interface).
14. power control method according to claim 11, it is characterized in that: when the magnitude of voltage that detects described hot plug detecting pin position is not less than described critical voltage value, described magnitude of voltage produces step and produces described second magnitude of voltage, when the magnitude of voltage that detects described hot plug detecting pin position during less than described critical voltage value, described magnitude of voltage produces step and produces described first magnitude of voltage.
15. power control method according to claim 11 is characterized in that: described magnitude of voltage produce step with a magnitude of voltage of described power supply as described first magnitude of voltage; And described magnitude of voltage produces step and comprises: according to described controlling signal, optionally the described magnitude of voltage with described power supply is converted to described second magnitude of voltage.
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| CN2007101387416A CN101370110B (en) | 2007-08-13 | 2007-08-13 | Power control unit and method for high-definition multimedia interface |
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| CN2007101387416A CN101370110B (en) | 2007-08-13 | 2007-08-13 | Power control unit and method for high-definition multimedia interface |
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| CN101370110A CN101370110A (en) | 2009-02-18 |
| CN101370110B true CN101370110B (en) | 2011-06-15 |
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| CN103888824A (en) * | 2012-12-19 | 2014-06-25 | 中国电信股份有限公司 | IPTV set-top box and automatic standby method thereof |
| CN103888556B (en) * | 2012-12-24 | 2017-07-14 | 华为终端有限公司 | A kind of control method of domestic terminal apparatus and domestic terminal apparatus |
| CN103702056B (en) * | 2013-12-13 | 2017-01-25 | 乐视致新电子科技（天津）有限公司 | HDMI (High-definition Multimedia Interface) signal processing circuit and method |
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| CN2701144Y (en) * | 2003-08-28 | 2005-05-18 | 明基电通股份有限公司 | Power supply circuit |
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| CN1387367A (en) * | 2001-05-22 | 2002-12-25 | 金宝电子工业股份有限公司 | Charger holder of digital camera able to transmit data |
| CN1672116A (en) * | 2002-08-21 | 2005-09-21 | 富士通株式会社 | Bus power device and power-source control method |
| CN2701144Y (en) * | 2003-08-28 | 2005-05-18 | 明基电通股份有限公司 | Power supply circuit |
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Effective date of registration: 20200407 Address after: No.1, Duhang 1st Road, Hsinchu City, Hsinchu Science Park, Taiwan, China Patentee after: MEDIATEK Inc. Address before: Hsinchu County, Taiwan, China Patentee before: MStar Semiconductor, Inc. |