CN101788969B - universal serial bus external device with internal auxiliary power supply - Google Patents
universal serial bus external device with internal auxiliary power supply Download PDFInfo
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- CN101788969B CN101788969B CN2009100025898A CN200910002589A CN101788969B CN 101788969 B CN101788969 B CN 101788969B CN 2009100025898 A CN2009100025898 A CN 2009100025898A CN 200910002589 A CN200910002589 A CN 200910002589A CN 101788969 B CN101788969 B CN 101788969B
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Abstract
The invention provides a universal serial bus external device with an internal auxiliary power supply. The external device is connected to a universal serial bus port of a host computer, and a positive power supply end of the universal serial bus port can supply a maximum output current. The external device comprises a load circuit and an auxiliary power supply circuit, wherein the load circuit is provided with the positive power supply end, so the positive power supply end of the universal serial bus port can supply a main current to the positive power supply end of the load circuit in a unidirectional mode; the positive power supply end of the load circuit can receive a load current to drive the external device; the auxiliary power supply circuit is provided with an output end, so the output end of the auxiliary power supply circuit can supply an auxiliary current to the positive power supply end of the load circuit in a unidirectional mode; when a load current demand rises to a first threshold current value, the load current is supplied by the main current and the auxiliary current; and when the load current demand falls to a second threshold current value, the load current is completely supplied by the main current.
Description
Technical field
The present invention is a kind of universal serial bus (Universal Serial Bus is hereinafter to be referred as USB) external device, refers to a kind of USB external device of tool internal auxiliary power supply especially.
Background technology
USB is advocated by Microsoft (Microsoft) and Intel (Intel), its maximum characteristics for support hot plug (Hot Plug) and plug and play (Plug and Play, PnP).
Please with reference to Fig. 1, it is that a USB external device is connected to a main frame (Host) synoptic diagram via a USB port that its institute illustrates.In the standard interface (Interface) of USB, comprise four end points, its be respectively correction data end (D+), negative data end (D-), positive power source terminal (V+), with earth terminal (GND), and be connected to USB external device 12 accordingly.Wherein, the correction data end (D+) of USB port 102 and negative data end (D-) are responsible for the transmission of main frame 10 and 12 data of USB external device; Positive power source terminal (V+) mainly is to USB external device 12 a supply voltage (supply voltage) to be provided; Earth terminal (GND) then is a ground connection.
In the specification of USB; The specified USB port voltage (Vbus) that 102 pairs of USB external devices 12 of USB port are provided is 0.5A (ampere) for the available specified USB port electric current of 5V (volt) (Ibus); Yet the USB port 102 actual USB port electric currents (Ibus) of general desktop PC or mobile computer are all greater than 0.5A; Generally can reach 1.3A, partly machine even can reach 1.5A.
In addition, USB external device 12 consumable electric currents as far as possible surpass the maximum USB port electric current (Ibus, for example 1.3A) that 102 of USB ports can provide, if the words that surpass possibly cause the work that USB external device 12 can't be stable.Yet; Concerning part USB external device; USB circumscribed slim optical drive (Slim Optical Disc Drive) for example, when it when driving various high power consumption operator scheme such as servo motor or mobile pallet (Tray), its needed current peak (Peak) possibly moment be higher than 1.3A.Because USB port 102 can't provide so big electric current to USB external device 12, therefore might cause the work that USB external device 12 can't be stable.
In addition; USB port 102 generally contains complementary metal oxide semiconductor (CMOS) element as ammeter (Current Meter); And CMOS itself has internal resistance; Therefore, the USB port voltage (Vbus) that also can cause USB port 102 to be exported when USB port electric current (Ibus) is excessive produces excessive pressure drop, when the USB port electric current (Ibus) of USB port 102 exceeds its maximum rated current; The voltage that USB external device 12 is accepted will descend; For example voltage is reduced to when being low to moderate a warning value (for example 4.6V even 0V) by 5V, and this moment, USB port 102 was forced closed (Shut Down), and the voltage of USB external device 12 will interrupt or cause USB external device 12 job insecurities.
In order to solve this problem, USB external device that can be bigger (like the circumscribed slim optical drive) power transformer of arranging in pairs or groups in addition (Power Adapter) to power consumption.As shown in Figure 1, be connected to the power supply that general socket 16 is provided by power transformer 14, make USB external device 12 can obtain enough electric currents and the ability operate as normal.Yet its original intention of advocating of USB external device is that the user is provided a light device that is easy to carry about with one, and needs the USB external device 12 of extra collocation power transformer 14, can cause user's inconvenience because of volume is excessive.
In this external USB specification, single USB port can connect 127 USB external devices at the most through a hub (Hub).When more USB external devices are used in single USB port simultaneously, and USB port also can cause work or the USB port that the USB external device can't be stable to be forced closed when limited electric current (for example 1.3A) only can be provided at most.
In order to solve this problem, United States Patent (USP) (US 7,017,055) exposure one can initiatively provide the hub circuit of power supply to the USB external device.Please with reference to Fig. 2, the functional block diagram that the hub of power supply can initiatively be provided that its illustrate is disclosed into United States Patent (USP) (US7,017,055).This can initiatively provide the hub of power supply mainly comprise a charging circuit 21, a rechargeable battery 23, always circulate direct current transducer (DC/DC Converter) 25, one control circuit 27, with a hub circuit 29.
At first; The electric energy (5V/0.5A) that can provide less than USB port when hub circuit 29 required electric energy; Control circuit 27 can make DC-DC converter 25 by (OFF) through first control signal (CS-1); And making charging circuit 21 conductings (ON) through second control signal (CS-2), this moment, hub circuit 29 required electric energy were provided by USB port fully.At the same time, the USB port electric energy (5V/0.5A) that can provide also can charge via 21 pairs of rechargeable batteries 23 of charging circuit.
The electric energy (5V/0.5A) that can provide greater than USB port when hub circuit 29 required electric energy; Control circuit 27 can make DC-DC converter 30 conductings (ON) through first control signal (CS-1); And make charging circuit 21 by (OFF) through second control signal (CS-2); This moment, hub circuit 29 required electric energy will be provided by 23 of rechargeable batteries fully, that is the stored electric energy of rechargeable battery 23 scripts this moment can provide to hub circuit 29 via DC-DC converter 25.
Moreover when this hub circuit 29 was pulled out the USB port in main frame, the electric energy that power transformer provided can be via 23 chargings of 21 pairs of rechargeable batteries of charging circuit.
Because charging circuit 21 is with the conducting (ON) of DC-DC converter 25 or by (OFF); That is rechargeable battery 23 is via the charging via 21 pairs of rechargeable batteries 23 of charging circuit of the power supply of 25 pairs of hub circuit 29 of DC-DC converter or USB port; All must control, therefore must increase the complicacy of control circuit 27 designs and the increase of cost by 27 of control circuits.In addition; When electric energy (5V/0.5A) that hub circuit 29 required electric energy can provide greater than USB port; This moment, hub circuit 29 required electric energy were provided by 23 of rechargeable batteries fully, and this will cause USB port can the idle of electric energy be provided to hub circuit 29 originally.
Moreover for the required electric energy of hub circuit 29 when providing, rechargeable battery 23 must be realized that just so enough electric energy to hub circuit 29 can be provided, it is too huge that this will cause 23 of rechargeable batteries to take up space by the battery of a plurality of serial connections.
Summary of the invention
Fundamental purpose of the present invention is to provide the USB external device of a tool internal auxiliary power supply.By simple circuit design, make it under the situation that does not need power transformer, to the USB external device extra auxiliary electric energy is provided.
The present invention proposes a kind of universal serial bus external device of tool internal auxiliary power supply; Be connected in a universal serial bus port of a main frame; And a positive power source terminal of this universal serial bus port can provide a maximum output current; Comprise: load circuit has a positive power source terminal, but makes this positive power source terminal uniaxially of this universal serial bus port supply this positive power source terminal of a principal current to this load circuit; Wherein, this positive power source terminal of this load circuit can receive a load current to drive this external device; And an auxiliary power circuit, have an output terminal, but make this output terminal uniaxially of this auxiliary power circuit supply this positive power source terminal of an auxiliary current to this load circuit; Wherein, when this load current demand rose to one first threshold current value, this load current was provided by this principal current and this auxiliary current jointly; And when this load current demand was reduced to one second threshold current value, this load current was all provided by this principal current.
Moreover; The present invention more proposes a kind of universal serial bus external device of tool internal auxiliary power supply; Be connected in a universal serial bus port of a main frame, and a positive power source terminal of this universal serial bus port can provide a maximum output current and an output voltage, and this output voltage is when reducing to a warning value; The electric current output of this universal serial bus port is forced decline; Comprise: a load circuit has a positive power source terminal, but makes this positive power source terminal uniaxially of this universal serial bus port supply this positive power source terminal of a principal current to this load circuit; Wherein, this positive power source terminal of this load circuit can receive a load current to drive this external device; And an auxiliary power circuit, have an output terminal, but make this output terminal uniaxially of this auxiliary power circuit supply this positive power source terminal of an auxiliary current to this load circuit; Wherein, rise to one first threshold current value or when this output voltage was reduced to this warning value, this load current was provided by this principal current and this auxiliary current jointly when this load current demand; And when this load current demand was reduced to one second threshold current value, this load current was all provided by this principal current.
Description of drawings
About aforementioned and other technology contents, characteristics and effect of the present invention, in the detailed description of following cooperation, can clearly appear with reference to the preferred embodiment of accompanying drawing, wherein:
It is that a USB external device is connected to a main frame (Host) synoptic diagram via a USB port that Fig. 1 illustrates.
The functional block diagram that the hub of power supply can initiatively be provided that Fig. 2 illustrate is disclosed into United States Patent (USP) (US 7,017,055).
Fig. 3 A illustrate is the circuit diagram of the USB external device of the tool internal auxiliary power supply of first embodiment of the invention.
Fig. 3 B illustrate is the current/voltage synoptic diagram in the USB external device of the tool internal auxiliary power supply that is applied to first embodiment of the invention.
Fig. 4 illustrate is the circuit diagram of the USB external device of the tool internal auxiliary power supply of second embodiment of the invention.
Embodiment
Please with reference to Fig. 3 A, its illustrate is the circuit diagram of the USB external device of the tool internal auxiliary power supply of first embodiment of the invention.Wherein, USB external device 50 mainly comprises an auxiliary power circuit 30 and a USB load circuit 32, and USB load circuit 32 can be an existing circumscribed slim optical drive, or the higher device of other power consumption stream.Auxiliary power circuit 30 mainly comprise a charging circuit 302, a rechargeable battery 304, a boost rectifying circuit (Boost Regulator) 306, one current sense device 308, with an on-off circuit (SW1).
Moreover, in the present embodiment, suppose USB port 402 the exportable USB port voltage of positive power source terminal (V+) (Vbus, 5V) with a maximal value be the USB port electric current (Ibus) of 1.3A.Moreover; When USB port electric current (Ibus) when rising to 1.3A; USB port voltage (Vbus) meeting is owing to interior inhibition effect drops to warning value (4.6V), and when USB port voltage (Vbus) is lower than warning value (4.6V), USB port 402 will descend because of on-off circuit (SW1) start make principal current (Iin).
Shown in Fig. 3 A, the positive power source terminal of USB port 402 (V+) is connected to the input end of current sense device 308 in the main frame 40, and the output terminal of current sense device 308 is connected to the positive power source terminal (V+) of load circuit 32.One input end of charging circuit 302 is connected to the positive power source terminal (V+) of USB port 402, and an output terminal of charging circuit 302 is connected to an input end of rechargeable battery 304 and boost rectifying circuit 306.One output terminal of boost rectifying circuit 306 is connected to an input end of on-off circuit (SW1), and an output terminal of on-off circuit (SW1) is connected to the input end of current sense device 308.Moreover a control end of current sense device 308 is connected to a control end of on-off circuit (SW1).Rechargeable battery 304 be a lithium battery and in the present embodiment lithium battery 3.7V can be provided.And charging circuit 302 can charge to rechargeable battery 304, and boost rectifying circuit 306 can be promoted to the voltage of rechargeable battery near the 5V.
Moreover the electric current that flow to USB load circuit 32 may be defined as load current (Iout), and this load current (Iout) may be defined as principal current (Iin) from the part of USB port 402; Part from rechargeable battery 304 may be defined as auxiliary current (Is).According to this first bright embodiment; The load current (Iout) of can flowing through between the input end of current sense device 308 and the output terminal; And when load current rose to greater than the first threshold current value (for example 1.3A), the control end of current sense device 308 was exported first accurate signal (for example high levle); Moreover when load current dropped to less than the second threshold current value (for example 0.8A), the control end of current sense device 308 was exported second accurate signal (for example low level).
Therefore, measure USB load circuit 32 required load currents (Iout) when current sense device 308 and rise to certain accurate position, during like 1.3A, current sense device 308 will be exported the control end of a high levle to on-off circuit (SW1) in order to conducting (ON) on-off circuit (SW1).Because the conducting (ON) of on-off circuit (SW1); Therefore rechargeable battery 304 can offer USB load circuit 32 through the on-off circuit (SW1) of conducting (ON) through the auxiliary current (Is) that boost rectifying circuit 306 is provided; That is Iout=Iin+Is; Make USB port voltage (Vbus) can not be lower than certain accurate position, like 4.6V.That is to say; When the required load current (Iout) of USB load circuit 32 during greater than the first threshold current value (1.3A); USB port 402 still can provide the principal current (Iin) of 1.3A to give USB load circuit 32; Not enough electric current difference will be provided by the auxiliary current (Is) that rechargeable battery 304 is provided.Thus, USB load circuit 32 can obtain enough load currents (Iout), and USB port 402 also can maintain going up of warning value (4.6V) and avoid being compelled to close (Shut down).
When current sense device 308 is reduced to the second threshold current value (for example 0.8A) by measurement USB load circuit 32 required load currents (Iout); The control end that current sense device 308 will export a low level to on-off circuit (SW1) this moment is in order to by (OFF) on-off circuit (SW1), and load current this moment (Iout) utilizes principal current (Iin) to supply power fully.That is to say that USB load circuit 32 required load currents (Iout) will be provided by principal current (Iin) fully, that is Iout=Iin.
Moreover when above-mentioned situation, USB port electric current (Ibus) partly also can provide to charging circuit 302, makes 302 pairs of rechargeable batteries of charging circuit 304 charge.
In addition; For avoid back and forth the change between 1.3A of USB load circuit 32 required load currents (Iout) cause on-off circuit (SW1) back and forth by (OFF) and conducting (ON); And cause more energy consumption; The first embodiment of the present invention is being utilized the first threshold current value (1.3A) and the second threshold current value (0.8A) of setting current sense device 308; Make load current (Iout) rise to 1.3A and after causing on-off circuit (SW1) conducting (ON); In case load current (Iout) is when reducing to 1.3A; The control end that current sense device 308 can't be exported low level to on-off circuit (SW1) immediately is in order to by (OFF) on-off circuit (SW1), but must wait until when load current (Iout) is reduced to second threshold value (0.8A), at this moment current sense device 308 just export low level to on-off circuit (SW1) control end in order to end (OFF) on-off circuit (SW1); So can avoid load current (Iout) between 1.3A back and forth change and cause on-off circuit (SW1) back and forth by (OFF) and conducting (ON), and cause more energy consumption.In like manner; For avoid back and forth the change between 0.8A of USB load circuit 32 required load currents (Iout) cause on-off circuit (SW1) back and forth by (OFF) and conducting (ON); And cause more energy consumption; The first embodiment of the present invention is reduced to 0.8A and is caused on-off circuit (SW1) after (OFF) at load current (Iout); In case load current (Iout) is when rising to 0.8A; Current sense device 308 can't be exported the control end of high levle to on-off circuit (SW1) immediately in order to conducting (ON) on-off circuit (SW1), but load current (Iout) when rising to 1.3A by the time, and the control end that this moment, current sense device 308 was just exported high levle to on-off circuit (SW1) is in order to conducting (ON) on-off circuit (SW1); So can avoid load current (Iout) between 0.8A back and forth change and cause on-off circuit (SW1) back and forth by (OFF) and conducting (ON), and cause more energy consumption.
Please with reference to Fig. 3 B, its illustrate is the current diagram in the USB external device of the tool internal auxiliary power supply that is applied to first embodiment of the invention.At first; Before time point t1; Because USB load circuit 32 required load currents (Iout) do not rise to 1.3A, current sense device 308 will be exported the control end that controls signal to on-off circuit (SW1) of low level at this moment, so on-off circuit (SW1) is for ending (OFF); Therefore the auxiliary current (Is) that provided of rechargeable battery 304 is zero, this moment Iout=Iin.
In time point t1 moment; Because USB load circuit 32 required load currents (Iout) rise to 1.3A; Current sense device 308 will be exported the control end that controls signal to on-off circuit (SW1) of high levle at this moment; Therefore on-off circuit (SW1) be conducting (ON), so rechargeable battery 304 is beginning to provide auxiliary current to USB load circuit 32 required load current (Iout), at this moment Iout=Iin+Is.
At time point t1 between the time point t2; This moment is not because USB load circuit 32 required load currents (Iout) are all reduced to 0.8A; Current sense device 308 will be exported the control end that controls signal to on-off circuit (SW1) of high levle at this moment; Therefore on-off circuit (SW1) still is conducting (ON), so rechargeable battery 304 will provide auxiliary current (Is) to USB load circuit 32 required load current (Iout), this moment Iout=Iin+Is.
In time point t2 moment; Because USB load circuit 32 required load currents (Iout) are reduced to 0.8A; Current sense device 308 will export the control end that controls signal to on-off circuit (SW1) of low level this moment, so on-off circuit (SW1) is for ending (OFF), so the auxiliary current (Is) that no longer provides of rechargeable battery 304; That is auxiliary current (Is) is zero, this moment Iout=Iin.And time point t3 is identical to the action of time point t4, therefore repeats no more.
Please with reference to Fig. 4, its illustrate is the circuit diagram of the USB external device of the tool internal auxiliary power supply of second embodiment of the invention.For the error of avoiding measuring causes when the current sense device is measured load current (Iout) and still is lower than 1.3A (for example 1.2A); And USB port voltage (Vbus) has been reduced to warning value (4.6V) and be forced closed (Shut Down); And causing principal current (Iin) can't provide foot to supply the required load current (Iout) of USB load circuit, second embodiment of the invention adopts current sense device and detecting voltage device simultaneously.As shown in Figure 4, USB external device 50 mainly comprises an auxiliary power circuit 30 and a USB load circuit 32, and USB load circuit 32 can be an existing circumscribed slim optical drive, or the higher device of other power consumption stream.Auxiliary power circuit 30 mainly comprise a charging circuit 302, a rechargeable battery 304, a boost rectifying circuit (Boost Regulator) 306, one current sense device 318, a detecting voltage device 320, with an on-off circuit (SW1).
The input end of current sense device 318 is connected to the positive power source terminal (V+) of USB port 402 in the main frame 40; The output terminal of current sense device 318 is connected to the positive power source terminal (V+) of USB load circuit 32, and the control end of current sense device 318 is connected to the control end of on-off circuit (SW1).Moreover the sense terminal of detecting voltage device 320 is connected to the positive power source terminal (V+) of USB port 402, and the control end of detecting voltage device 310 connects current sense device 318.
According to this second bright embodiment; The load current (Iout) of can flowing through between the input end of current sense device 318 and the output terminal; And when load current rose to greater than the first threshold current value (for example 1.3A), the control end of current sense device 318 was exported first accurate signal (for example high levle); Moreover when load current dropped to less than the second threshold current value (for example 0.8A), the control end of current sense device 318 was exported second accurate signal (for example low level).
Moreover; The sense terminal of detecting voltage device 320 is during less than a warning value (for example 4.6V); The control end of detecting voltage device 320 is exported first accurate signal (for example high levle) to current sense device 318, goes out the end output first accurate position (for example high levle) in order to impressed current detector 318.
At first; Even measuring USB port voltage (Vbus) when detecting voltage device 320 is higher than warning value (4.6V) and exports a low level to current sense device 318; In case current sense device 308 is measured load current (Iout) and is risen to 1.3A; Current sense device 308 will be exported the control end that controls signal to on-off circuit (SW1) of a high levle in order to conducting (ON) on-off circuit (SW1), so the auxiliary current (Is) that rechargeable battery 304 is provided can offer USB load circuit 32 through the on-off circuit (SW1) of conducting.
Perhaps, (Iout) do not rise to 1.3A as yet even current sense device 308 is measured load current.Yet; In case detecting voltage device 310 is measured USB port voltage (Vbus) and is reduced to warning value (4.6V); Detecting voltage device 310 will be exported a high levle to current sense device 318; Make the control end that controls signal to on-off circuit (SW1) that current sense device 318 forces output one high levle in order to conducting (ON) on-off circuit (SW1), so the auxiliary current (Is) that rechargeable battery 304 is provided can offer USB load circuit 32 through the on-off circuit (SW1) of conducting.Thus, USB load circuit 32 can obtain enough load currents (Iout), and USB port 402 also can avoid being compelled to close (Shutdown).
And the condition of ending (OFF) on-off circuit (SW1) only has one; Promptly be when current sense device 318 when measuring USB load circuit 32 required load currents (Iout) and reduce to the second threshold current value (for example 0.8A), the control end that this moment, current sense device 318 just can be exported a low level to on-off circuit (SW1) is in order to by (OFF) on-off circuit (SW1).
In sum, the USB external device of tool internal auxiliary power supply of the present invention has following characteristics:
The first, because rechargeable battery 304 of the present invention only provides required load current (Iout) of USB load circuit 32 and the difference between principal current (Iin); And need not be responsible for the required whole load currents (Iout) of USB load circuit 32, therefore rechargeable battery 304 of the present invention can only be realized by a lithium battery.Therefore, rechargeable battery 304 of the present invention has more the advantage that accounts for less space.
The second, because rechargeable battery 304 of the present invention only provides required load current (Iout) of USB load circuit 32 and the difference between principal current (Iin); Therefore when the required load current (Iout) of load circuit 32 during greater than 1.3A; USB port 402 still provides 1.3A to USB load circuit 32, can't cause the idle of USB port electric current (Ibus).
Three, owing to be built in the USB external device in the auxiliary power circuit 30 of the present invention, therefore do not need extra power transformer, also do not need initiatively to provide the hub (Hub) of power supply, so the present invention has more the convenient advantage of using of user.
In sum; Though the present invention discloses as above with preferred embodiment; Right its is not in order to limiting the present invention, anyly has the knack of this operator, do not breaking away from the spirit and scope of the present invention; When can doing various changes and retouching, so protection scope of the present invention is when looking being as the criterion that the claim scope defined.
Claims (8)
1. the universal serial bus external device of a tool internal auxiliary power supply is connected in a universal serial bus port of a main frame, and a positive power source terminal of this universal serial bus port can provide a maximum output current, and this device comprises:
One load circuit has a positive power source terminal, but makes this positive power source terminal uniaxially of this universal serial bus port supply this positive power source terminal of a principal current to this load circuit; Wherein, this positive power source terminal of this load circuit can receive a load current to drive this external device; And
One auxiliary power circuit comprises:
One current sense device has an input end, an output terminal and a control end, and this load current can be flowed through between this input end and this output terminal of this current sense device;
One charging circuit has the positive power source terminal that an input end is connected to this universal serial bus port;
One rechargeable battery is connected to an output terminal of this charging circuit, and this rechargeable battery provides auxiliary current;
One boost rectifying circuit has the output terminal that an input end is connected to this charging circuit;
One on-off circuit has the output terminal that an input end is connected to this boost rectifying circuit, has this input end that an output terminal is connected to this current sense device, has this control end that a control end is connected to this current sense device;
Wherein, when this load current demand rose to one first threshold current value, this this on-off circuit conducting of current sense device control made this load current provided jointly by this principal current and this auxiliary current; And when this load current demand was reduced to one second threshold current value, this this on-off circuit of current sense device control was by this load current is all provided by this principal current.
2. the universal serial bus external device of tool internal auxiliary power supply as claimed in claim 1, wherein this first threshold current value is this maximum output current value.
3. the universal serial bus external device of tool internal auxiliary power supply as claimed in claim 1, wherein, when this load current during less than this maximum output current, this positive power source terminal of this universal serial bus port can be to this rechargeable battery charging.
4. the universal serial bus external device of tool internal auxiliary power supply as claimed in claim 1, wherein this rechargeable battery is a lithium battery.
5. the universal serial bus external device of a tool internal auxiliary power supply; Be connected in a universal serial bus port of a main frame; And a positive power source terminal of this universal serial bus port can provide a maximum output current and an output voltage; And when this output voltage was reduced to a warning value, the output of the electric current of this universal serial bus port was forced decline, and this device comprises:
One load circuit has a positive power source terminal, but makes this positive power source terminal uniaxially of this universal serial bus port supply this positive power source terminal of a principal current to this load circuit; Wherein, this positive power source terminal of this load circuit can receive a load current to drive this external device; And
One auxiliary power circuit comprises:
One current sense device has an input end, an output terminal and a control end, and this load current can be flowed through between this input end and this output terminal of this current sense device;
One detecting voltage device has this positive power source terminal that a sense terminal is connected to this universal serial bus port, has a control end and is connected to this current sense device;
One charging circuit has the positive power source terminal that an input end is connected to this universal serial bus port;
One rechargeable battery is connected to an output terminal of this charging circuit, and this rechargeable battery provides auxiliary current;
One boost rectifying circuit has the output terminal that an input end is connected to this charging circuit;
One on-off circuit has the output terminal that an input end is connected to this boost rectifying circuit, has this input end that an output terminal is connected to this current sense device, has this control end that a control end is connected to this current sense device;
Wherein, when this load current demand rises to one first threshold current value or when this output voltage is reduced to this warning value, this this on-off circuit conducting of current sense device control makes this load current provided jointly by this principal current and this auxiliary current; And when this load current demand was reduced to one second threshold current value, this this on-off circuit of current sense device control was by this load current is all provided by this principal current.
6. the universal serial bus external device of tool internal auxiliary power supply as claimed in claim 5, wherein this first threshold current value is this maximum output current value.
7. the universal serial bus external device of tool internal auxiliary power supply as claimed in claim 5, wherein, when this load current during less than this maximum output current, this positive power source terminal of this universal serial bus port can be to this rechargeable battery charging.
8. the universal serial bus external device of tool internal auxiliary power supply as claimed in claim 5, wherein this rechargeable battery is a lithium battery.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100025898A CN101788969B (en) | 2009-01-23 | 2009-01-23 | universal serial bus external device with internal auxiliary power supply |
| US12/616,461 US20100133908A1 (en) | 2008-11-28 | 2009-11-11 | Usb device with internal assisting power |
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| CN2009100025898A CN101788969B (en) | 2009-01-23 | 2009-01-23 | universal serial bus external device with internal auxiliary power supply |
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| CN101788969A CN101788969A (en) | 2010-07-28 |
| CN101788969B true CN101788969B (en) | 2012-02-08 |
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| CN2009100025898A Expired - Fee Related CN101788969B (en) | 2008-11-28 | 2009-01-23 | universal serial bus external device with internal auxiliary power supply |
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| CN102377202A (en) * | 2010-08-26 | 2012-03-14 | 鸿富锦精密工业（深圳）有限公司 | Power supply voltage boosting device and electronic system with same |
| GB2532337B (en) * | 2014-08-29 | 2021-08-04 | Pismo Labs Technology Ltd | Apparatus and method for a mobile router to receive power from a plurality of power supplies |
| US10411466B2 (en) | 2014-12-21 | 2019-09-10 | Pismo Lab Technology Limited | Apparatus and method for a mobile router to receive power from a plurality of power supplies |
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| US7017055B1 (en) * | 2004-12-08 | 2006-03-21 | Cyber Power System Inc. | Hub that can supply power actively |
| CN101286646A (en) * | 2007-04-13 | 2008-10-15 | 宏碁股份有限公司 | Charging equipment of portable device |
| CN101312303A (en) * | 2007-05-21 | 2008-11-26 | 佛山普立华科技有限公司 | Power source switching apparatus |
-
2009
- 2009-01-23 CN CN2009100025898A patent/CN101788969B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7017055B1 (en) * | 2004-12-08 | 2006-03-21 | Cyber Power System Inc. | Hub that can supply power actively |
| CN101286646A (en) * | 2007-04-13 | 2008-10-15 | 宏碁股份有限公司 | Charging equipment of portable device |
| CN101312303A (en) * | 2007-05-21 | 2008-11-26 | 佛山普立华科技有限公司 | Power source switching apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101788969A (en) | 2010-07-28 |
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