CN106340915A - Terminal equipment - Google Patents
Terminal equipment Download PDFInfo
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- CN106340915A CN106340915A CN201610718210.3A CN201610718210A CN106340915A CN 106340915 A CN106340915 A CN 106340915A CN 201610718210 A CN201610718210 A CN 201610718210A CN 106340915 A CN106340915 A CN 106340915A
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- addition function
- signal
- function module
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- 230000009466 transformation Effects 0.000 claims abstract description 15
- 238000006243 chemical reaction Methods 0.000 claims description 98
- 238000001914 filtration Methods 0.000 claims description 4
- 230000002093 peripheral effect Effects 0.000 abstract description 41
- 238000003780 insertion Methods 0.000 description 13
- 230000037431 insertion Effects 0.000 description 13
- 230000008859 change Effects 0.000 description 10
- 238000000034 method Methods 0.000 description 10
- 230000005611 electricity Effects 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- QWCRAEMEVRGPNT-UHFFFAOYSA-N buspirone Chemical compound C1C(=O)N(CCCCN2CCN(CC2)C=2N=CC=CN=2)C(=O)CC21CCCC2 QWCRAEMEVRGPNT-UHFFFAOYSA-N 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/30—Charge provided using DC bus or data bus of a computer
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Power Sources (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention provides terminal equipment. The output end of a DC voltage transformation module is connected with a USB interface and the input end of an enable circuit. The output end of the enable circuit is connected with a first input end of an addition function module. A master control chip is connected with a second input end of the addition function module. The output end of the addition function module is connected with the control end of the DC voltage transformation module. The enable circuit is used for generating a first level signal according to the pulse width modulation PWM pulse at the output end of the DC voltage transformation module when the DC voltage transformation module is in a working state. The addition function module is used for outputting a first control signal used for making the DC voltage transformation module output PWM pulse when the signal of the first input end is the first level signal and/or the signal of the second input end is the first level signal. Thus, after the terminal equipment goes into a standby mode, the USB interface can continue to charge peripherals.
Description
Technical field
The present invention relates to communication technology, more particularly, to a kind of terminal unit.
Background technology
Pass through USB (universal serial bus) (universal serial bus, referred to as: the usb) interface in terminal unit at present
Other peripheral hardwares are charged becomes a kind of conventional function in terminal unit.
And the usb interface that the terminal unit premise that to be other peripheral hardwares be charged is terminal unit must have electricity, and terminal
It is that terminal unit necessarily be in open state that the usb interface of equipment must have the premise of electricity, makes to charge to other peripheral hardwares
Terminal unit is always maintained at open state, if a peripheral hardware is charged using the usb interface of terminal, once terminal sets
Standby standby, now usb interface because losing power supply, and can not will be charged for peripheral hardware, and terminal unit therefore can be led to standby
Afterwards, usb interface can not be charged for peripheral hardware.
In order to avoid terminal unit standby after, the problem that usb interface can not be charged for peripheral hardware, doing in prior art
Method is that when no matter setting terminal unit is in open state or holding state, usb interface is all powered, thus avoiding terminal unit
It is in the problem cannot being charged during holding state to other peripheral hardwares.
Content of the invention
The embodiment of the present invention provides a kind of terminal unit, and to overcome after in prior art, terminal unit is standby, usb interface is not
The problem being charged for peripheral hardware.
The present invention provides a kind of terminal unit, comprising: USB (universal serial bus) usb interface, main control chip and unidirectional current buckling
Die change block, wherein, described main control chip is used for exporting the first level signal when described terminal unit is started shooting, and sets in described terminal
Second signal of telecommunication is exported, described terminal unit also includes: enable circuit and addition function module when standby standby；
The outfan of the described DC voltage conversion module input phase with described usb interface and described enable circuit respectively
Even；
The described outfan enabling circuit is connected with the first input end of described addition function module；Described main control chip and
Second input of described addition function module is connected, the outfan of described addition function module and described DC voltage conversion mould
The control end of block is connected, and described enable circuit is used for when described DC voltage conversion module is in running order, according to described
The pulse width modulation pwm pulse of DC voltage conversion module outfan generates described first level signal；
Described addition function module is described first level signal and/or described second in the signal of described first input end
When the signal of input is described first level signal, export the first control signal, described first control signal is used for controlling institute
State the output pwm pulse of DC voltage conversion module.
In the embodiment of the present invention: main control chip is used for exporting the first level signal when terminal unit is started shooting, and sets in terminal
Second signal of telecommunication, the outfan input with usb interface and enable circuit respectively of DC voltage conversion module is exported when standby standby
End is connected；The outfan enabling circuit is connected with the first input end of addition function module；Main control chip and addition function module
Second input be connected, the outfan of addition function module is connected with the control end of DC voltage conversion module, enable circuit
For when DC voltage conversion module is in running order, according to the pulse width modulation of DC voltage conversion module outfan
Pwm pulse generates the first level signal；Addition function module is the first level signal and/or second in the signal of first input end
When the signal of input is the first level signal, export the first control signal, the first control signal is used for controlling unidirectional current buckling
Die change block exports pwm pulse.So that after terminal unit is standby, usb interface can continue as peripheral hardware and be charged.
Brief description
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
Have technology description in required use accompanying drawing be briefly described it should be apparent that, drawings in the following description are these
Some bright embodiments, for those of ordinary skill in the art, without having to pay creative labor, acceptable
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 show the circuit diagram powered for usb interface in correlation technique；
Fig. 2 show the structural representation one of terminal unit provided in an embodiment of the present invention；
Fig. 3 show the structural representation two of terminal unit provided in an embodiment of the present invention；
Fig. 4 show the structural representation three of terminal unit provided in an embodiment of the present invention；
Fig. 5 show the structural representation four of terminal unit provided in an embodiment of the present invention.
Specific embodiment
Purpose, technical scheme and advantage for making the embodiment of the present invention are clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is described.
The network architecture of embodiment of the present invention description and business scenario are in order to more clearly the explanation present invention is implemented
The technical scheme of example, does not constitute the restriction for technical scheme provided in an embodiment of the present invention, those of ordinary skill in the art
Understand, the appearance of the differentiation with the network architecture and new business scene, technical scheme provided in an embodiment of the present invention is for similar
Technical problem, equally applicable.
Term " first " in the description of the present invention, claims and above-mentioned accompanying drawing, " second ", etc. be for distinguishing
Similar object, without for describing specific order or precedence.It should be appreciated that such data using is in suitable feelings
Can exchange under condition, so as embodiments of the invention example described herein can with except here illustrate or description those with
Outer order is implemented.Additionally, term " comprising " and " having " and their any deformation are it is intended that cover non-exclusive bag
Contain, for example, contain the process of series of steps, method, comprising a series of units, the system of module, product or equipment need not
Be limited to those steps or the unit clearly listed, but may include clearly not listing or for these processes, method,
Product or the intrinsic other steps of equipment or unit.In the present invention, involved " at least one " refers to one kind, or multiple
The meaning.
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation description is it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of not making creative work
Embodiment, broadly falls into the scope of protection of the invention.
It should be noted that input in the present invention believing to the enable signal of DC voltage conversion module for logic high
Number, namely the control end of DC voltage conversion module normal work when receiving logic high electricity frequency.
Fig. 1 show the circuit diagram powered for usb interface in correlation technique, as shown in figure 1, this circuit includes leading
Control chip, the voltage source vcc of DC voltage conversion module, DC voltage conversion module and usb interface,
Wherein, the main control chip in terminal unit is connected with control end en of DC voltage conversion module；Unidirectional current buckling
The voltage source vcc of die change block is connected with the input vin of DC voltage conversion module；The outfan sw of DC voltage conversion module
It is connected with vbus (power supply) pin in usb interface.
When terminal unit is in open state, main control chip in terminal unit is to the control of DC voltage conversion module
End en output logic high, now DC voltage conversion module normal work, normal supplying power for outside, DC voltage conversion module
In outfan sw output pwm pulse, this pwm pulse forms the unidirectional current making needed for usb interface normal work after filtering afterwards
Pressure vusb, for example: can be 5v, that is, now the vusb in the usb interface in Fig. 1 circuit is normally powered, usb interface is normal
Work, can be normally carried out charging for other peripheral hardwares in insertion usb interface.
When terminal unit is in holding state, main control chip in terminal unit is to the control of DC voltage conversion module
End en exports logic low, and now DC voltage conversion module does not work, and not supplying power for outside, thus the usb in Fig. 1 circuit connects
Mouthful in vusb not charged, namely when terminal unit working condition when open state is changed to holding state it is impossible to continue
It is to proceed to charge by other peripheral hardwares that usb interface charges in open state.
The present invention passes through to arrange an enable circuit and addition function module, thus when terminal unit is changed to from normal work
During holding state, in the moment of change, DC voltage conversion module is in working condition, now, enables circuit direct
The dutycycle of the pwm pulse of outfan sw output of voltage transformation module, so that it is determined that to add circuit input logic high level
Signal, and main control chip is to add circuit input logic low level signal, so that addition function module is according to enabling circuit input
Logic-high signal and described main control chip input logic-low signal determine continue to DC voltage conversion module
Output logic-high signal, to control DC voltage conversion module to keep working condition, thus be continuously peripheral hardware carry out
Charge.Solve in terminal unit as in peripheral hardware charging process, when peripheral hardware does not complete to charge, standby situation occurs it is impossible to
Complete the problem of peripheral hardware charging.
Fig. 2 show the structural representation one of terminal unit provided in an embodiment of the present invention, as shown in Fig. 2 the present embodiment
Terminal unit may include that USB (universal serial bus) usb interface 11, main control chip 12, DC voltage conversion module 13, master control core
Piece 12 is used for exporting the first level signal when terminal unit is started shooting, and exports second electrical level signal when terminal unit is standby,
In the embodiment of the present invention, above-mentioned terminal unit also includes: enables circuit 14 and addition function module 15；
The outfan of DC voltage conversion module 13 respectively with terminal unit in USB (universal serial bus) usb interface 11 in
Vbus pin is connected with the input enabling circuit 14；
The outfan enabling circuit 14 is connected with the first input end of addition function module 15；Main control chip 12 and addition work(
Can the second input of module 15 be connected, the control end phase of the outfan of addition function module 15 and DC voltage conversion module 13
Even；
Wherein, enable circuit 14 and be used for when DC voltage conversion module 13 is in running order, according to unidirectional current buckling
The pulse width modulation pwm pulse of die change block 13 outfan generates described first level signal；
Addition function module 15 is that the signal of the first level signal and/or the second input is in the signal of first input end
During the first level signal, export the first control signal, described first control signal is used for controlling described DC voltage conversion module
13 output pwm pulses.
In above-described embodiment, the outfan of DC voltage conversion module 13 is connected with the v_bus pin in usb interface 11,
For providing running voltage for usb interface 11.
In prior art, during terminal unit in normal work is the peripheral hardware charging in insertion usb interface, if
The Status Change of terminal unit is holding state, and the main control chip 12 in terminal unit can be to the control of DC voltage conversion module 13
End processed inputs second electrical level signal, and now, DC voltage conversion module 13 externally can not export pwm pulse, namely direct current
Voltage transformation module 13 can not externally continue power, also just cannot export vbus to usb interface 11, due to usb interface 11 without
Electricity, the peripheral hardware that also just cannot continue as inserting in usb interface 11 charges.
When being charged for the peripheral hardware in insertion usb interface 11 due to DC voltage conversion module 13, the duty of pwm pulse
Larger frequently, and work as the peripheral hardware that DC voltage conversion module 13 is not in insertion usb interface 11 and be charged and charge
Full of when, the dutycycle of pwm pulse is 0, is exactly the above-mentioned characteristic of the dutycycle by using pwm pulse, in electricity in the present invention
Increase in road and enable circuit 14 and addition function module 15, wherein, this enable circuit 14 is used for the dutycycle life according to pwm pulse
One-tenth can make the first control signal of DC voltage conversion module 13 normal work.
For example: when the dutycycle that enable circuit 14 detects pwm pulse is more than some default value, then to addition work(
Module 15 can input the first level signal；The dutycycle of pwm pulse is detected when enabling circuit 14 less than some default value
When, input second electrical level signal to addition function module 15.
Be in normal operating conditions in terminal unit, now, DC voltage conversion module 13 be in normal operating conditions and
When being charged for the peripheral hardware in insertion usb interface 11, enable what circuit 14 exported according to now DC voltage conversion module 13
The dutycycle of pwm pulse generates the first level signal, and inputs to addition function module 15, and now because terminal unit is in
Normal operating conditions, thus now main control chip 12 to addition function module 15 input also be the first level signal so that plus
Method functional module 15 is according to the first level letter of the first level signal enabling circuit 14 input and described main control chip 12 input
Number determine continue to DC voltage conversion module 13 export the first control signal, to control at DC voltage conversion module 13 continuation
In working condition, thus being charged for the peripheral hardware in insertion usb interface 11.
When terminal unit is changed to holding state from normal operating conditions, due to the moment in change, unidirectional current buckling
Die change block 13 is in normal operating conditions, and is charged for the peripheral hardware in insertion usb interface 11, now, enables electricity
The dutycycle of the pwm pulse that road 14 exports according to DC voltage conversion module 13 generates the first level signal, and inputs to addition
Functional module 15, and now because terminal unit is in holding state, so main control chip 12 inputs to addition function module 15
Second electrical level signal, so that addition function module 15 is defeated according to the first level signal and main control chip 12 enabling circuit 14 input
The second electrical level signal entering determines that continuation exports the first control signal to DC voltage conversion module 13, to control unidirectional current buckling
Die change block 13 keeps working condition, thus the peripheral hardware being continuously in insertion usb interface 11 is charged.
Be in normal operating conditions in terminal unit, now, DC voltage conversion module 13 be in normal operating conditions and
It is charged for the peripheral hardware in insertion usb interface 11 and peripheral hardware charges when filling with, when terminal unit is from normal operating conditions
When being changed to holding state, enable the dutycycle life of the pwm pulse that circuit 14 exports according to now DC voltage conversion module 13
Become second electrical level signal, and input to addition function module 15, and now because terminal unit is in holding state, so now
Main control chip 12 to addition function module 15 input also be second electrical level signal so that addition function module 15 according to enable electricity
The second electrical level signal of the second electrical level signal of road 14 input and described main control chip 12 input determines continuation to unidirectional current buckling
Die change block 13 exports the second control signal, so that DC voltage conversion module 13 keeps off working state, thus not being slotting
The peripheral hardware entering in usb interface 11 is charged.
Be in normal operating conditions in terminal unit, now, DC voltage conversion module 13 be in normal operating conditions and
When being not inserted into peripheral hardware in usb interface 11, when terminal unit is changed to holding state from normal operating conditions, enable circuit 14
The dutycycle of the pwm pulse according to the output of now DC voltage conversion module 13 generates second electrical level signal, and inputs to addition
Functional module 15, and now because terminal unit is in holding state, so now main control chip 12 is to addition function module 15
Input is also second electrical level signal, so that addition function module 15 is according to the second electrical level signal enabling circuit 14 input and institute
The second electrical level signal stating main control chip 12 input determines that continuation exports the second control signal to DC voltage conversion module 13, with
DC voltage conversion module 13 is made to keep off working state.
It is in normal operating conditions in terminal unit, now, but the peripheral hardware in unpromising insertion usb interface 11 is filled
Electricity, the peripheral hardware normal power supply being only in insertion usb interface 11 realizes the other functions such as data transfer, when terminal unit is from normal
When working condition is changed to holding state, enable the pwm pulse that circuit 14 exports according to now DC voltage conversion module 13
Dutycycle generates second electrical level signal, and inputs to addition function module 15, and now because terminal unit is in holding state,
So what now main control chip 12 inputted to addition function module 15 is also second electrical level signal, so that addition function module 15
Determine according to the second electrical level signal of the second electrical level signal enabling circuit 14 input and described main control chip 12 input and continue to straight
Stream voltage transformation module 13 exports the second control signal, so that DC voltage conversion module 13 keeps off working state.
By above-mentioned analysis, addition function module 15 is used for according to the level signal enabling circuit 14 input and master
The signal of control chip 12 input determines whether that DC voltage conversion module 13 output enables signal and includes:
If the signal enabling circuit 14 input is the first level signal, and the signal of main control chip 12 input is second electrical level
Signal, then addition function module 15 is to DC voltage conversion module 13 output the first control signal；
If the signal enabling circuit 14 input is the first level signal, and the signal of main control chip 12 input is the first level
Signal, then addition function module 15 is to DC voltage conversion module 13 output the first control signal；
If the signal enabling circuit 14 input is second electrical level signal, and the signal of main control chip 12 input is the first level
Signal, then addition function module 15 is to DC voltage conversion module 13 output the first control signal；
If the signal enabling circuit 14 input is second electrical level signal, and the signal of main control chip 12 input is second electrical level
Signal, then addition function module 15 is to DC voltage conversion module 13 output the second control signal.
In a kind of attainable mode of the present invention, the first above-mentioned level signal can be logic-high signal,
Above-mentioned second electrical level signal can be logic-low signal, and now, above-mentioned logical relation is as shown in table 1:
Table 1
The embodiment of the present invention provides a kind of terminal unit, comprising: USB (universal serial bus) usb interface, main control chip and direct current
Voltage transformation module, wherein, main control chip is used for exporting the first level signal when terminal unit is started shooting, standby in terminal unit
When export second signal of telecommunication, terminal unit also includes: enables circuit and addition function module；The output of DC voltage conversion module
End is connected with the input of usb interface and enable circuit respectively；Enable the outfan of circuit and the first of addition function module defeated
Enter end to be connected；Main control chip is connected with the second input of addition function module, the outfan of addition function module and unidirectional current
The control end of pressure conversion module is connected, and enables circuit and is used for when DC voltage conversion module is in running order, according to direct current
The pulse width modulation pwm pulse of voltage transformation module outfan generates the first level signal；Addition function module is defeated first
When entering the signal at end to be the signal of the first level signal and/or the second input being the first level signal, output first controls letter
Number, the first control signal is used for controlling the output pwm pulse of DC voltage conversion module.So that after terminal unit is standby, usb
Interface can continue as peripheral hardware and be charged.
Fig. 3 show the structural representation two of terminal unit provided in an embodiment of the present invention, on the basis of Fig. 2, such as Fig. 3
Shown, the enable circuit 14 in Fig. 2 includes: comparison circuit 141 and filter circuit 142；
Wherein, the outfan of DC voltage conversion module 13 is connected with the input enabling circuit 14, comprising: DC voltage
The outfan of conversion module 13 is connected with the first input end of comparison circuit 141 by filter circuit 142, because pwm pulse is
The pulse of one low and high level, the pulses switch of low and high level can be become a metastable level by this filter circuit 142
Signal；
Second input of comparison circuit 141 is connected with reference voltage source；
The outfan enabling circuit 14 is connected with the first input end of addition function module 15, comprising: comparison circuit 141
Outfan is connected with the first input end of addition function module 15；
Enable circuit 14 and be used for when DC voltage conversion module 13 is in running order, according to DC voltage conversion module
The pwm pulse of 13 outfans exports corresponding level signal to addition function module 15 and includes: comparison circuit 141 is used for comparing
When the corresponding voltage of pwm pulse of the first input end input of circuit 141 is higher than the voltage of the second input of comparison circuit 141
Export the first level signal to addition function module 15, correspond in the pwm pulse of the input of the first input end of comparison circuit 141
Voltage be less than comparison circuit 141 the voltage of the second input when to addition function module 15 export second electrical level signal.
The magnitude of voltage of the reference voltage source in the present invention according to insertion peripheral hardware in usb interface 11 and can be not inserted into peripheral hardware
When, the corresponding magnitude of voltage of pwm pulse of the outfan of DC voltage conversion module 13 determines, the present invention is not any limitation as to it,
As long as can distinguishing in usb interface 11 and whether inserting peripheral hardware.
It should be noted that in a kind of attainable mode of the present invention, above-mentioned reference voltage source can be by terminal
Battery in equipment provides, in order to reach default magnitude of voltage, when being provided by the battery in terminal unit, can be in terminal unit
In battery and the second input of comparison circuit 141 between connect the adjustable resistance of a resistance, thus ensure that input to than
Reach preset value compared with the voltage of the second input of circuit 141.
In the attainable mode of another kind of the present invention, enable circuit 14 and corresponding function can be realized by mcu,
When this mcu obtains the first level signal or second electrical level signal according to the dutycycle of pwm pulse.
Fig. 4 show the structural representation three of terminal unit provided in an embodiment of the present invention, on the basis of Fig. 2 and Fig. 3,
As shown in figure 4, the filter circuit 142 enabling in circuit 14 in Fig. 3 includes: first resistor a and the first electric capacity b；
Wherein, the outfan of described DC voltage conversion module 13 passes through described filter circuit 142 and described comparison circuit
141 first input end is connected, comprising:
The outfan of described DC voltage conversion module 13 is connected with one end of described first resistor a, described first resistor a
The other end be connected with the first input end of described comparison circuit 141；
The other end of described first resistor a is also connected with one end of described first electric capacity b, and described first electric capacity b's is another
End ground connection.
Due to DC voltage conversion module 13 outfan output for pwm pulse, by above-mentioned first resistor a and the
One electric capacity b can carry out rc filtering to pwm pulse, thus obtaining magnitude of voltage corresponding with pwm pulse, in order to comparison circuit
141 are compared using the corresponding magnitude of voltage of pwm pulse obtaining, to determine the level letter to addition function module 15 input
Number.
In one embodiment of the invention, as shown in figure 4, above-mentioned addition function module 15 includes: the first diode
151 and second diode 152,
The outfan of described comparison circuit 141 is connected with the first input end of described addition function module 15, comprising: described
The outfan of comparison circuit 141 is connected with the anode of described first diode 151；
Described main control chip 12 is connected with the second input of described addition function module 15, comprising: described main control chip
12 are connected with the anode of described second diode 152；
The outfan of described addition function module 15 is connected with the control end of described DC voltage conversion module 13, comprising:
The negative electrode of described first diode 151 be connected with the negative electrode of described second diode 152 and all with described unidirectional current
The control end of pressure conversion module 13 is connected, and may be constructed addition function by arranging the first diode 151 and the second diode 152
Module 15.
When DC voltage conversion module 13 is in running order, main control chip 12 normal work, main control chip 12 exports
Logic-high signal, the second diode 152 turns on, thus by the negative electrode of the second diode 152 to DC voltage conversion mould
The control end input logic high level signal of block 13；Now when inserting peripheral hardware in the usb interface 11 of terminal unit, comparison circuit
During 141 outfan output logic high, the first diode 151 turns on, thus by the negative electrode of the first diode 151 to straight
The control end input logic high level signal of stream voltage transformation module 13, after two logic highs combine, then to DC voltage
The control end input of conversion module 13 for logic-high signal；Now when being not inserted in the usb interface 11 of terminal unit
During peripheral hardware, during the outfan output logic low of comparison circuit 141, the first diode 151 ends, thus passing through the one or two pole
The negative electrode of pipe 151 is to control end input logic low level signal, logic low and the logic high of DC voltage conversion module 13
Level combine after, then to DC voltage conversion module 13 control end input also be logic-high signal；
When DC voltage conversion module 13 is in the situation of off position, now main control chip 12 does not work, master control core
Piece 12 exports logic-low signal, and the second diode 152 ends, thus by the negative electrode of the second diode 152 to unidirectional current
No matter whether the control end input logic low level signal of pressure conversion module 13, insert peripheral hardware, comparison circuit in usb interface 11
What 141 outfan exported is logic low, and the first diode 151 ends, thus by the negative electrode of the first diode 151
Control end input logic low level signal to DC voltage conversion module 13.
In the attainable mode of another kind of the present invention, above-mentioned addition function module 15 can be realized by OR gate,
Can also be realized by mcu, the present invention is not any limitation as to it.
Further as shown in figure 4, above-mentioned terminal unit also includes: the second electric capacity 21,
The negative electrode of described second diode 152 is also connected with one end of described second electric capacity 21, described second electric capacity 21
The other end is grounded.
Further, on the basis of Fig. 4, as shown in figure 5, above-mentioned terminal unit also includes: second resistance 22；
The negative electrode of described second diode 152 is connected with one end of described second electric capacity 21 by second resistance 22.
And because the present invention is the improvement on existing circuit base, therefore as shown in figure 4, DC voltage conversion module
The connection of 13 other ports is similar to the correlation technique shown in Fig. 1, and here is omitted.
Terminal unit provided in an embodiment of the present invention includes: the outfan of DC voltage conversion module respectively with usb interface
It is connected with the input enabling circuit；The outfan enabling circuit is connected with the first input end of add circuit；Main control chip and
Second input of add circuit is connected, and the outfan of add circuit is connected with the control end of DC voltage conversion module, enables
Circuit is used for when DC voltage conversion module is in running order, according to the pulse width of DC voltage conversion module outfan
Modulation pwm pulse exports corresponding level signal to add circuit, and add circuit is used for according to the level letter enabling circuit input
Number and main control chip input signal determine whether DC voltage conversion module output enable signal.
Due in dutycycle and the usb interface of the pulse width modulation pwm pulse of DC voltage conversion module outfan it is
No insertion peripheral hardware is related, therefore, can be connected with DC voltage conversion module outfan by the dutycycle determination of pwm pulse
Whether peripheral hardware is inserted, thus inputting corresponding level signal to add circuit, so that add circuit combines master in usb interface
With real-time, the input signal of control chip controls whether DC voltage conversion module works, thus it is standby to avoid terminal unit
In the case of in order to charge to peripheral hardware, thus the safety problem that usb interface is constantly in electriferous state and brings, effectively improve and be
The stability of system.
Finally it is noted that various embodiments above, only in order to technical scheme to be described, is not intended to limit；To the greatest extent
Pipe has been described in detail to the present invention with reference to foregoing embodiments, it will be understood by those within the art that: its according to
So the technical scheme described in foregoing embodiments can be modified, or wherein some or all of technical characteristic is entered
Row equivalent；And these modifications or replacement, do not make the essence of appropriate technical solution depart from various embodiments of the present invention technology
The scope of scheme.
Claims (7)
1. a kind of terminal unit, comprising: USB (universal serial bus) usb interface, main control chip and DC voltage conversion module, wherein,
Described main control chip is used for exporting the first level signal when described terminal unit is started shooting, and exports when described terminal unit is standby
Second signal of telecommunication is it is characterised in that described terminal unit also includes: enables circuit and addition function module；
The outfan of described DC voltage conversion module is connected with the input of described usb interface and described enable circuit respectively；
The described outfan enabling circuit is connected with the first input end of described addition function module；Described main control chip and described
Second input of addition function module is connected, the outfan of described addition function module and described DC voltage conversion module
Control end is connected, and described enable circuit is used for when described DC voltage conversion module is in running order, according to described direct current
The pulse width modulation pwm pulse of voltage transformation module outfan generates described first level signal；
Described addition function module is described first level signal and/or described second input in the signal of described first input end
When the signal at end is described first level signal, export the first control signal, described first control signal is used for controlling described straight
Stream voltage transformation module output pwm pulse.
2. terminal unit according to claim 1 is it is characterised in that described enable circuit includes: comparison circuit and filtering
Circuit；
The outfan of described DC voltage conversion module is connected with the described input enabling circuit, comprising: described DC voltage
The outfan of conversion module is connected with the first input end of described comparison circuit by described filter circuit；
Second input of described comparison circuit is connected with reference voltage source；
The described outfan enabling circuit is connected with the first input end of described addition function module, comprising: described comparison circuit
Outfan be connected with the first input end of described addition function module；
Described enable circuit is used for when described DC voltage conversion module is in running order, according to described DC voltage conversion
The pwm pulse of module outfan generates the first level signal and includes:
Described comparison circuit is used for after the described pwm pulse after filtering of the first input end input of described comparison circuit
DC voltage generates described first level signal when being higher than the voltage of the second input of described comparison circuit.
3. terminal unit according to claim 2 is it is characterised in that described addition function module is in described first input end
Signal when to be the signal of described first level signal and/or described second input be described first level signal, output the
One control signal includes:
If it is described first level signal that described comparison circuit inputs to the signal of described addition function module, and described master control core
Piece input to described addition function module signal be described second electrical level signal, then described addition function module is to described direct current
Voltage transformation module exports described first control signal；
If it is described first level signal that described comparison circuit inputs to the signal of described addition function module, and described master control core
Piece input to described addition function module signal be described first level signal, then described addition function module is to described direct current
Voltage transformation module exports described first control signal.
4. the terminal unit according to Claims 2 or 3 is it is characterised in that described filter circuit includes: first resistor and
One electric capacity；
The outfan of described DC voltage conversion module is by the first input end phase of described filter circuit and described comparison circuit
Even, comprising:
The outfan of described DC voltage conversion module is connected with one end of described first resistor, the other end of described first resistor
It is connected with the first input end of described comparison circuit；
The other end of described first resistor is also connected with one end of described first electric capacity, the other end ground connection of described first electric capacity.
5. terminal unit according to claim 4 is it is characterised in that described addition function module includes: the first diode
With the second diode,
The outfan of described comparison circuit is connected with the first input end of described addition function module, comprising: described comparison circuit
Outfan be connected with the anode of described first diode；
Described main control chip is connected with the second input of described addition function module, comprising: described main control chip and described the
The anode of two diodes is connected；
The outfan of described addition function module is connected with the control end of described DC voltage conversion module, comprising:
The negative electrode of described first diode be connected with the negative electrode of described second diode and all with described DC voltage conversion module
Control end be connected.
6. terminal unit according to claim 5 is it is characterised in that also include: the second electric capacity,
The negative electrode of described second diode is also connected with one end of described second electric capacity, the other end ground connection of described second electric capacity.
7. the terminal unit according to Claims 2 or 3 is it is characterised in that described addition function module is OR gate.
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| CN201610718210.3A CN106340915B (en) | 2016-08-24 | 2016-08-24 | Terminal device |
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| CN201610718210.3A CN106340915B (en) | 2016-08-24 | 2016-08-24 | Terminal device |
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| CN106340915B CN106340915B (en) | 2019-04-09 |
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| CN106340915B (en) | 2019-04-09 |
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Address after: 266555 Qingdao economic and Technological Development Zone, Shandong, Hong Kong Road, No. 218 Patentee after: Hisense Visual Technology Co., Ltd. Address before: 266555 Qingdao economic and Technological Development Zone, Shandong, Hong Kong Road, No. 218 Patentee before: QINGDAO HISENSE ELECTRONICS Co.,Ltd. |