CN105471038A - Control method and electronic equipment - Google Patents
Control method and electronic equipment Download PDFInfo
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- CN105471038A CN105471038A CN201511001731.9A CN201511001731A CN105471038A CN 105471038 A CN105471038 A CN 105471038A CN 201511001731 A CN201511001731 A CN 201511001731A CN 105471038 A CN105471038 A CN 105471038A
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- 238000000034 method Methods 0.000 title claims abstract description 32
- 230000005611 electricity Effects 0.000 claims abstract description 26
- 238000010586 diagram Methods 0.000 description 26
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 239000004973 liquid crystal related substance Substances 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
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
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- H02J2007/0067—
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- Crystallography & Structural Chemistry (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention discloses a control method and electronic equipment. The control method comprises the steps as follows: a voltage value of a power supply for supplying electricity to a light-emitting component is detected; the voltage value is used for reflecting the electric quantity of the power supply; a control signal is generated according to the voltage value; and a resistor of a control circuit of the light-emitting component is connected by responding to the control signal, so that a current value when the power supply supplies electricity to the light-emitting component is controlled through the control circuit according to the connected resistor.
Description
Technical field
The present invention relates to control technology, particularly relate to a kind of control method, electronic equipment.
Background technology
At present, electronic equipment such as the display screen of mobile phone mostly adopts liquid crystal (LCD, LiquidCrystalDisplay) display screen.Along with the demand of user, the size of LCD display constantly increases, and LCD back facet current is also more and more higher.When the battery electric quantity of electronic equipment is very low, larger load current will cause the unexpected power down shutdown of electronic equipment; If battery has been crossed and put, electronic equipment has been plugged charger and has also been difficult to start at once, and namely enable start also can be shut down because load current is excessive very soon.
Existing solution is the brightness by software limitations LCD display, reduces load current.The program needs could implement after software startup.After battery is crossed and put shutdown, software also cannot load, and the program can not be implemented.In addition, the program realizes difficulty difference for different operating system, does not have versatility.
Summary of the invention
For solving the problems of the technologies described above, embodiments provide a kind of control forwarding method, electronic equipment.
A kind of control method, comprising:
Detect the magnitude of voltage being used for the power supply of powering to emitting components, described magnitude of voltage is for embodying the electricity of described power supply;
According to described magnitude of voltage, generate control signal;
Respond described control signal, be communicated with the resistance of the control circuit of described emitting components, with make by described control circuit according to connect resistance control described power supply give described emitting components power time current value.
In the embodiment of the present invention, described control circuit comprises the first resistance and the second resistance, and the resistance value of described first resistance is greater than the resistance value of described second resistance; Described control circuit also comprises switch, and described first resistance is connected with described switch respectively with described second resistance;
The resistance of the control circuit of the described emitting components of described connection, comprising:
Control the operating state of described switch to realize the resistance be communicated with in described control circuit;
Wherein, when described switch is the first operating state, described first resistance is communicated with described control circuit;
When described switch is the second operating state, described second resistance is communicated with described control circuit.
In the embodiment of the present invention, described according to described magnitude of voltage generation control signal, comprising:
Judge the relation of described magnitude of voltage and threshold voltage;
When described magnitude of voltage is greater than described threshold voltage, produce the second control information, described second control signal is described second operating state for controlling described switch;
When described magnitude of voltage is less than or equal to described threshold voltage, produce the first control information, described first control signal is described first operating state for controlling described switch.
In the embodiment of the present invention, described emitting components is connected with adapter, and described adapter comprises charging circuit;
Utilize described charging circuit charging current to be exported to described emitting components and electronic devices and components to be launched, power to give described emitting components and electronic devices and components to be launched;
When described switch is described first operating state, the charging current value that described charging circuit exports is less than or equal to the current value of described emitting components and the starting current value sum of described electronic devices and components to be launched, starts successfully to make described electronic devices and components to be launched.
In the embodiment of the present invention, detected the magnitude of voltage of the power supply being used for powering to emitting components by electric voltage observation circuit; Described electric voltage observation circuit and/or described control circuit and/or described charging circuit and the integrated setting of described emitting components.
The electronic equipment that the embodiment of the present invention provides, comprising: emitting components, power supply;
Electric voltage observation circuit, for detecting the magnitude of voltage for the power supply of powering to described emitting components, described magnitude of voltage is for embodying the electricity of described power supply; According to described magnitude of voltage, generate control signal;
Control circuit, for responding described control signal, is communicated with the resistance of the control circuit of described emitting components, with make according to connect resistance control described power supply give described emitting components power time current value.
In the embodiment of the present invention, described control circuit comprises the first resistance and the second resistance, and the resistance value of described first resistance is greater than the resistance value of described second resistance; Described control circuit also comprises switch, and described first resistance is connected with described switch respectively with described second resistance;
Described control circuit, also for controlling the operating state of described switch to realize the resistance be communicated with in described control circuit; Wherein, when described switch is the first operating state, described first resistance is communicated with described control circuit; When described switch is the second operating state, described second resistance is communicated with described control circuit.
In the embodiment of the present invention, described electric voltage observation circuit, also for judging the relation of described magnitude of voltage and threshold voltage; When described magnitude of voltage is greater than described threshold voltage, produce the second control information, described second control signal is described second operating state for controlling described switch; When described magnitude of voltage is less than or equal to described threshold voltage, produce the first control information, described first control signal is described first operating state for controlling described switch.
In the embodiment of the present invention, described electronic equipment also comprises adapter; Described emitting components is connected with adapter, and described adapter comprises charging circuit;
Described adapter, also for utilizing described charging circuit to export charging current to described emitting components and electronic devices and components to be launched, powers to give described emitting components and electronic devices and components to be launched; Wherein, when described switch is described first operating state, the charging current value that described charging circuit exports is less than or equal to the current value of described emitting components and the starting current value sum of described electronic devices and components to be launched, starts successfully to make described electronic devices and components to be launched.
In the embodiment of the present invention, described electric voltage observation circuit and/or described control circuit and/or described charging circuit and the integrated setting of described emitting components.
In the technical scheme of the embodiment of the present invention, electronic equipment has electric voltage observation circuit, and utilize this electric voltage observation circuit can detect magnitude of voltage for the power supply of powering to emitting components, described magnitude of voltage is for embodying the electricity of described power supply; According to described magnitude of voltage, generate control signal.Electronic equipment also has control circuit, control circuit responds described control signal, be communicated with the resistance of the control circuit of described emitting components, with make by described control circuit according to connect resistance control described power supply give described emitting components power time current value.So, when electric quantity of power supply is not enough, the resistance with larger resistance value is communicated with by described control circuit, and like this, the electric current of powering to described emitting components will diminish, thus effectively reduces the risk of the unexpected power down shutdown of electronic equipment.In addition, the technical scheme of the embodiment of the present invention belongs to pure hardware plan, and when after the shutdown of power supply overdischarge subset, the supply current of emitting components reduces automatically, and the start that charger can realize electronic equipment plugged by the adapter one of electronic equipment.The technical scheme of the embodiment of the present invention can cross-platform, cross operating system application, highly versatile.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the control method of the embodiment of the present invention one;
Fig. 2 is the schematic flow sheet of the control method of the embodiment of the present invention two;
Fig. 3 is the schematic flow sheet of the control method of the embodiment of the present invention three;
Fig. 4 is the schematic flow sheet of the control method of the embodiment of the present invention four;
Fig. 5 is the structure composition schematic diagram of the electronic equipment of the embodiment of the present invention one;
Fig. 6 is the structure composition schematic diagram of the electronic equipment of the embodiment of the present invention two;
Fig. 7 is the structure composition schematic diagram of the electronic equipment of the embodiment of the present invention two;
Fig. 8 is the LCD backlight drive circuit schematic diagram of LCD display;
Fig. 9 is the schematic diagram of the electric voltage observation circuit of the embodiment of the present invention;
Figure 10 is the schematic diagram of the control circuit of the embodiment of the present invention;
Figure 11 is the electric voltage observation circuit of the embodiment of the present invention and the combination schematic diagram of control circuit;
Figure 12 is the schematic diagram of the charging circuit of the embodiment of the present invention.
Embodiment
In order to feature and the technology contents of the embodiment of the present invention more at large can be understood, be described in detail below in conjunction with the realization of accompanying drawing to the embodiment of the present invention, the use of appended accompanying drawing explanation only for reference, be not used for limiting the embodiment of the present invention.
Fig. 1 is the schematic flow sheet of the control method of the embodiment of the present invention one, and the control method in this example is applied to electronic equipment, and as shown in Figure 1, described control method comprises the following steps:
Step 101: detect the magnitude of voltage being used for the power supply of powering to emitting components, described magnitude of voltage is for embodying the electricity of described power supply; According to described magnitude of voltage, generate control signal.
In the embodiment of the present invention, electronic equipment can be mobile phone, panel computer etc.Electronic equipment has display screen, and this example take display screen as LCD display for example explains, and certainly, display screen can also be other types, such as light-emitting diode (LED, LightEmittingDiode) display screen.
With reference to the LCD backlight drive circuit schematic diagram that Fig. 8, Fig. 8 are LCD display, be described for TPS61162 here, TPS61162 is the integrated circuit (IC, IntegratedCircuit) of LCD backlight drive circuit.Back facet current maximum, namely the current value of emitting components passes through R
iSET(in figure R1) is arranged, and computing formula is as follows:
Wherein, I
fB_fullfor the current maxima of emitting components place circuit; K
iSET_full=1030; V
iSET_full=1.229V; R
iSETfor the resistance (in figure R1) that ISET pin is communicated with.
I is set
fB_full=20mA, R1=63.3K (selection resistance value is that the resistance of 63.4K carries out current limliting), suppose that input VSYS voltage is 3.6V, emitting components quantity is 14, emitting components conducting voltage is 3.0V, backlight IC conversion efficiency is 85%, so needs corresponding VSYS input current to be: 14 × 3 × 20/ (3.6 × 85%)=274.5mA.
In the embodiment of the present invention, electronic equipment has electric voltage observation circuit, and this electric voltage observation circuit can the magnitude of voltage of power supply of detected electrons equipment, and described magnitude of voltage can embody the electricity of power supply.With reference to the schematic diagram that Fig. 9, Fig. 9 are the electric voltage observation circuit of the embodiment of the present invention, the VCC end of electric voltage observation circuit is connected to power supply (VBAT), for detecting the magnitude of voltage of power supply; The GND end of electric voltage observation circuit connects ground; The output (OUT) of electric voltage observation circuit exports control signal.
Step 102: respond described control signal, is communicated with the resistance of the control circuit of described emitting components, with make by described control circuit according to connect resistance control described power supply give described emitting components power time current value.
In the embodiment of the present invention, electronic equipment also has control circuit, and this control circuit is connected with above-mentioned electric voltage observation circuit, and be the schematic diagram of the control circuit of the embodiment of the present invention with reference to Figure 10, Figure 10, control circuit V+ end inputs VSYS with system and is connected; The COM end of control circuit is held with the ISET in Fig. 8 and is connected; The IN end of control circuit is held with the OUT in Fig. 9 and is connected, for reception control signal; The GND end of control circuit is connected to the ground; The NC end of control circuit is connected with R1, and the NO end of control circuit is connected with R2, wherein, and R1=634K, R2=63.4K.Control circuit is according to control signal, and select resistance R1 or resistance R2 communicating pipe in the circuit of emitting components, when the resistance value being communicated to circuit is larger, the current value of emitting components is less; Otherwise when the resistance value being communicated to circuit is less, the current value of emitting components is larger.
In the embodiment of the present invention, when detecting that the magnitude of voltage of power supply is less, then show that the electricity of power supply is less, now, control signal makes control circuit connect larger resistance, carries out current limliting to emitting components.When the magnitude of voltage of the power supply detected is larger, then show that the electricity of power supply is comparatively large, now, control signal makes control circuit connect less resistance, emitting components normal luminous.So, when electric quantity of power supply is not enough, the resistance with larger resistance value is communicated with by described control circuit, and like this, the electric current of powering to described emitting components will diminish, thus effectively reduces the risk of the unexpected power down shutdown of electronic equipment.
Fig. 2 is the schematic flow sheet of the control method of the embodiment of the present invention two, and the control method in this example is applied to electronic equipment, and as shown in Figure 2, described control method comprises the following steps:
Step 201: detect the magnitude of voltage being used for the power supply of powering to emitting components, described magnitude of voltage is for embodying the electricity of described power supply; According to described magnitude of voltage, generate control signal.
In the embodiment of the present invention, electronic equipment can be mobile phone, panel computer etc.Electronic equipment has display screen, and this example take display screen as LCD display for example explains, and certainly, display screen can also be other types, such as light-emitting diode (LED, LightEmittingDiode) display screen.
With reference to the LCD backlight drive circuit schematic diagram that Fig. 8, Fig. 8 are LCD display, be described for TPS61162 here, TPS61162 is the integrated circuit (IC, IntegratedCircuit) of LCD backlight drive circuit.Back facet current maximum, namely the current value of emitting components passes through R
iSET(in figure R1) is arranged, and computing formula is as follows:
Wherein, I
fB_fullfor the current maxima of emitting components place circuit; K
iSET_full=1030; V
iSET_full=1.229V; R
iSETfor the resistance (in figure R1) that ISET pin is communicated with.
I is set
fB_full=20mA, R1=63.3K (selection resistance value is that the resistance of 63.4K carries out current limliting), suppose that input VSYS voltage is 3.6V, emitting components quantity is 14, emitting components conducting voltage is 3.0V, backlight IC conversion efficiency is 85%, so needs corresponding VSYS input current to be: 14 × 3 × 20/ (3.6 × 85%)=274.5mA.
In the embodiment of the present invention, electronic equipment has electric voltage observation circuit, and this electric voltage observation circuit can the magnitude of voltage of power supply of detected electrons equipment, and described magnitude of voltage can embody the electricity of power supply.With reference to the schematic diagram that Fig. 9, Fig. 9 are the electric voltage observation circuit of the embodiment of the present invention, the VCC end of electric voltage observation circuit is connected to power supply (VBAT), for detecting the magnitude of voltage of power supply; The GND end of electric voltage observation circuit connects ground; The output (OUT) of electric voltage observation circuit exports control signal.
Step 202: respond described control signal, controls the operating state of switch to realize the resistance be communicated with in control circuit; Wherein, when described switch is the first operating state, described first resistance is communicated with described control circuit; When described switch is the second operating state, described second resistance is communicated with described control circuit, with make by described control circuit according to connect resistance control described power supply give described emitting components power time current value.
In the embodiment of the present invention, electronic equipment also has control circuit, and described control circuit comprises the first resistance and the second resistance, and the resistance value of described first resistance is greater than the resistance value of described second resistance; Described control circuit also comprises switch, and described first resistance is connected with described switch respectively with described second resistance; This control circuit is connected with above-mentioned electric voltage observation circuit, and be the schematic diagram of the control circuit of the embodiment of the present invention with reference to Figure 10, Figure 10, control circuit V+ end inputs VSYS with system and is connected; The COM end of control circuit is held with the ISET in Fig. 8 and is connected; The IN end of control circuit is held with the OUT in Fig. 9 and is connected, for reception control signal; The GND end of control circuit is connected to the ground; The NC end of control circuit is connected with R1 (the first resistance), and the NO end of control circuit is connected with R2 (the second resistance), wherein, and R1=634K, R2=63.4K.Control circuit is according to control signal, and select resistance R1 or resistance R2 communicating pipe in the circuit of emitting components, when the resistance value being communicated to circuit is larger, the current value of emitting components is less; Otherwise when the resistance value being communicated to circuit is less, the current value of emitting components is larger.
In the embodiment of the present invention, when detecting that the magnitude of voltage of power supply is less, then show that the electricity of power supply is less, now, control signal makes the switch in control circuit be the first operating state, larger resistance (the first resistance) is communicated with described control circuit, carries out current limliting to emitting components.When the magnitude of voltage of the power supply detected is larger, then show that the electricity of power supply is comparatively large, now, control signal makes the switch in control circuit be the second operating state, less resistance (the second resistance) is communicated with described control circuit, emitting components normal luminous.So, when electric quantity of power supply is not enough, the resistance with larger resistance value is communicated with by described control circuit, and like this, the electric current of powering to described emitting components will diminish, thus effectively reduces the risk of the unexpected power down shutdown of electronic equipment.
Fig. 3 is the schematic flow sheet of the control method of the embodiment of the present invention three, and the control method in this example is applied to electronic equipment, and as shown in Figure 3, described control method comprises the following steps:
Step 301: detect the magnitude of voltage being used for the power supply of powering to emitting components, described magnitude of voltage is for embodying the electricity of described power supply.
In the embodiment of the present invention, electronic equipment can be mobile phone, panel computer etc.Electronic equipment has display screen, and this example take display screen as LCD display for example explains, and certainly, display screen can also be other types, such as light-emitting diode (LED, LightEmittingDiode) display screen.
With reference to the LCD backlight drive circuit schematic diagram that Fig. 8, Fig. 8 are LCD display, be described for TPS61162 here, TPS61162 is the integrated circuit (IC, IntegratedCircuit) of LCD backlight drive circuit.Back facet current maximum, namely the current value of emitting components passes through R
iSET(in figure R1) is arranged, and computing formula is as follows:
Wherein, I
fB_fullfor the current maxima of emitting components place circuit; K
iSET_full=1030; V
iSET_full=1.229V; R
iSETfor the resistance (in figure R1) that ISET pin is communicated with.
I is set
fB_full=30mA, R1=63.3K (selection resistance value is that the resistance of 63.4K carries out current limliting), suppose that input VSYS voltage is 3.6V, emitting components quantity is 14, emitting components conducting voltage is 3.0V, backlight IC conversion efficiency is 85%, so needs corresponding VSYS input current to be: 14 × 3 × 30/ (3.6 × 85%)=274.5mA.
In the embodiment of the present invention, electronic equipment has electric voltage observation circuit, and this electric voltage observation circuit can the magnitude of voltage of power supply of detected electrons equipment, and described magnitude of voltage can embody the electricity of power supply.With reference to the schematic diagram that Fig. 9, Fig. 9 are the electric voltage observation circuit of the embodiment of the present invention, the VCC end of electric voltage observation circuit is connected to power supply (VBAT), for detecting the magnitude of voltage of power supply; The GND end of electric voltage observation circuit connects ground; The output (OUT) of electric voltage observation circuit exports control signal.
Step 302: the relation judging described magnitude of voltage and threshold voltage; When described magnitude of voltage is greater than described threshold voltage, produce the second control information, described second control signal is the second operating state for controlling switch; When described magnitude of voltage is less than or equal to described threshold voltage, produce the first control information, described first control signal is the first operating state for controlling described switch.
In the embodiment of the present invention, threshold voltage can be arranged according to the specific implementation of electronic equipment, such as, threshold voltage is set to 3.3V.
With reference to Figure 11, Figure 11 is the electric voltage observation circuit of the embodiment of the present invention and the combination schematic diagram of control circuit, when electric quantity of power supply is enough (supply voltage is greater than threshold voltage), OUT end in figure exports high level (the second control signal), now, ISET is connected by control circuit and R2, and as R2=63.4K, the electric current of emitting components is 20mA; When electric quantity of power supply is not enough (supply voltage is lower than threshold voltage), the OUT in figure holds output low level (the first control signal), and now, ISET is connected by control circuit and R1, and as R1=634K, the electric current of emitting components is 2mA.Now, the VSYS input current that needs are corresponding is: 14 × 3 × 2/ (3.6 × 85%)=27.4mA<<274.5mA.
Step 303: respond described control signal, controls the operating state of switch to realize the resistance be communicated with in control circuit; Wherein, when described switch is the first operating state, described first resistance is communicated with described control circuit; When described switch is the second operating state, described second resistance is communicated with described control circuit, with make by described control circuit according to connect resistance control described power supply give described emitting components power time current value.
In the embodiment of the present invention, electronic equipment also has control circuit, and described control circuit comprises the first resistance and the second resistance, and the resistance value of described first resistance is greater than the resistance value of described second resistance; Described control circuit also comprises switch, and described first resistance is connected with described switch respectively with described second resistance; This control circuit is connected with above-mentioned electric voltage observation circuit, and be the schematic diagram of the control circuit of the embodiment of the present invention with reference to Figure 10, Figure 10, control circuit V+ end inputs VSYS with system and is connected; The COM end of control circuit is held with the ISET in Fig. 8 and is connected; The IN end of control circuit is held with the OUT in Fig. 9 and is connected, for reception control signal; The GND end of control circuit is connected to the ground; The NC end of control circuit is connected with R1 (the first resistance), and the NO end of control circuit is connected with R2 (the second resistance), wherein, and R1=634K, R2=63.4K.Control circuit is according to control signal, and select resistance R1 or resistance R2 communicating pipe in the circuit of emitting components, when the resistance value being communicated to circuit is larger, the current value of emitting components is less; Otherwise when the resistance value being communicated to circuit is less, the current value of emitting components is larger.
In the embodiment of the present invention, when detecting that the magnitude of voltage of power supply is less, then show that the electricity of power supply is less, now, control signal makes the switch in control circuit be the first operating state, larger resistance (the first resistance) is communicated with described control circuit, carries out current limliting to emitting components.When the magnitude of voltage of the power supply detected is larger, then show that the electricity of power supply is comparatively large, now, control signal makes the switch in control circuit be the second operating state, less resistance (the second resistance) is communicated with described control circuit, emitting components normal luminous.So, when electric quantity of power supply is not enough, the resistance with larger resistance value is communicated with by described control circuit, and like this, the electric current of powering to described emitting components will diminish, thus effectively reduces the risk of the unexpected power down shutdown of electronic equipment.
Fig. 4 is the schematic flow sheet of the control method of the embodiment of the present invention four, and the control method in this example is applied to electronic equipment, and as shown in Figure 4, described control method comprises the following steps:
Step 401: detect the magnitude of voltage being used for the power supply of powering to emitting components, described magnitude of voltage is for embodying the electricity of described power supply.
In the embodiment of the present invention, electronic equipment can be mobile phone, panel computer etc.Electronic equipment has display screen, and this example take display screen as LCD display for example explains, and certainly, display screen can also be other types, such as light-emitting diode (LED, LightEmittingDiode) display screen.
With reference to the LCD backlight drive circuit schematic diagram that Fig. 8, Fig. 8 are LCD display, be described for TPS61162 here, TPS61162 is the integrated circuit (IC, IntegratedCircuit) of LCD backlight drive circuit.Back facet current maximum, namely the current value of emitting components passes through R
iSET(in figure R1) is arranged, and computing formula is as follows:
Wherein, I
fB_fullfor the current maxima of emitting components place circuit; K
iSET_full=1030; V
iSET_full=1.229V; R
iSETfor the resistance (in figure R1) that ISET pin is communicated with.
I is set
fB_full=40mA, R1=63.3K (selection resistance value is that the resistance of 63.4K carries out current limliting), suppose that input VSYS voltage is 3.6V, emitting components quantity is 14, emitting components conducting voltage is 3.0V, backlight IC conversion efficiency is 85%, so needs corresponding VSYS input current to be: 14 × 3 × 40/ (3.6 × 85%)=274.5mA.
In the embodiment of the present invention, electronic equipment has electric voltage observation circuit, and this electric voltage observation circuit can the magnitude of voltage of power supply of detected electrons equipment, and described magnitude of voltage can embody the electricity of power supply.With reference to the schematic diagram that Fig. 9, Fig. 9 are the electric voltage observation circuit of the embodiment of the present invention, the VCC end of electric voltage observation circuit is connected to power supply (VBAT), for detecting the magnitude of voltage of power supply; The GND end of electric voltage observation circuit connects ground; The output (OUT) of electric voltage observation circuit exports control signal.
Step 402: the relation judging described magnitude of voltage and threshold voltage; When described magnitude of voltage is greater than described threshold voltage, produce the second control information, described second control signal is the second operating state for controlling switch; When described magnitude of voltage is less than or equal to described threshold voltage, produce the first control information, described first control signal is the first operating state for controlling described switch.
In the embodiment of the present invention, threshold voltage can be arranged according to the specific implementation of electronic equipment, such as, threshold voltage is set to 3.3V.
With reference to Figure 11, Figure 11 is the electric voltage observation circuit of the embodiment of the present invention and the combination schematic diagram of control circuit, when electric quantity of power supply is enough (supply voltage is greater than threshold voltage), OUT end in figure exports high level (the second control signal), now, ISET is connected by control circuit and R2, and as R2=63.4K, the electric current of emitting components is 20mA; When electric quantity of power supply is not enough (supply voltage is lower than threshold voltage), the OUT in figure holds output low level (the first control signal), and now, ISET is connected by control circuit and R1, and as R1=634K, the electric current of emitting components is 2mA.Now, the VSYS input current that needs are corresponding is: 14 × 3 × 2/ (3.6 × 85%)=27.4mA<<274.5mA.
Step 403: respond described control signal, controls the operating state of switch to realize the resistance be communicated with in control circuit; Wherein, when described switch is the first operating state, described first resistance is communicated with described control circuit; When described switch is the second operating state, described second resistance is communicated with described control circuit, with make by described control circuit according to connect resistance control described power supply give described emitting components power time current value.
In the embodiment of the present invention, electronic equipment also has control circuit, and described control circuit comprises the first resistance and the second resistance, and the resistance value of described first resistance is greater than the resistance value of described second resistance; Described control circuit also comprises switch, and described first resistance is connected with described switch respectively with described second resistance; This control circuit is connected with above-mentioned electric voltage observation circuit, and be the schematic diagram of the control circuit of the embodiment of the present invention with reference to Figure 10, Figure 10, control circuit V+ end inputs VSYS with system and is connected; The COM end of control circuit is held with the ISET in Fig. 8 and is connected; The IN end of control circuit is held with the OUT in Fig. 9 and is connected, for reception control signal; The GND end of control circuit is connected to the ground; The NC end of control circuit is connected with R1 (the first resistance), and the NO end of control circuit is connected with R2 (the second resistance), wherein, and R1=634K, R2=63.4K.Control circuit is according to control signal, and select resistance R1 or resistance R2 communicating pipe in the circuit of emitting components, when the resistance value being communicated to circuit is larger, the current value of emitting components is less; Otherwise when the resistance value being communicated to circuit is less, the current value of emitting components is larger.
In the embodiment of the present invention, when detecting that the magnitude of voltage of power supply is less, then show that the electricity of power supply is less, now, control signal makes the switch in control circuit be the first operating state, larger resistance (the first resistance) is communicated with described control circuit, carries out current limliting to emitting components.When the magnitude of voltage of the power supply detected is larger, then show that the electricity of power supply is comparatively large, now, control signal makes the switch in control circuit be the second operating state, less resistance (the second resistance) is communicated with described control circuit, emitting components normal luminous.So, when electric quantity of power supply is not enough, the resistance with larger resistance value is communicated with by described control circuit, and like this, the electric current of powering to described emitting components will diminish, thus effectively reduces the risk of the unexpected power down shutdown of electronic equipment.
Step 404: utilize described charging circuit charging current to be exported to described emitting components and electronic devices and components to be launched, powers to give described emitting components and electronic devices and components to be launched; When described switch is described first operating state, the charging current value that described charging circuit exports is less than or equal to the current value of described emitting components and the starting current value sum of described electronic devices and components to be launched, starts successfully to make described electronic devices and components to be launched.
In the embodiment of the present invention, described emitting components is connected with adapter, and described adapter comprises charging circuit.With reference to Figure 12, Figure 12 is the schematic diagram of the charging circuit of the embodiment of the present invention, wherein, USB end connects outside charger to charge to electronic equipment, the voltage of USB end is generally 5V, after overcharge circuit, export the SYS voltage of 3.5V-44.45V to electronic equipment, the SYS end in figure is held with the VSYS in Fig. 8 and is connected.To put to such an extent as to after shutting down when the power supply of electronic equipment is crossed, observation circuit detects that the voltage of power supply is lower than threshold voltage, and now, switch is the first operating state, controlling the first larger resistance is switched in circuit, and the current limit of emitting components is less electric current.And now, the charging current value that charging circuit exports is less than or equal to the current value of described emitting components and the starting current value sum of described electronic devices and components to be launched, start successfully to make described electronic devices and components to be launched.
Under normal circumstances, within the input current of charging circuit is limited in 500mA, as VSYS=3.6V, if charging circuit conversion efficiency is 85%, then the maximum system power that can provide of charging circuit is: 500 × 5 × 85%/3.6=590mA.
Now, if the starting current of electronic equipment electronic devices and components to be launched is 500mA, then:
When connecting R2, total starting current is: 500+274.5=774.5mA>590mA, and electronic equipment cannot normally start;
When connecting R1, total starting current is: 500+27.4=527.4mA<590mA, and electronic equipment can normally start.
For the electronic equipment of dull and stereotyped (Tablet) class, the advantage of the technical scheme of the embodiment of the present invention is more outstanding.Blade product so that backlight is 36:
When connecting R2, total starting current is: 500+274.5/14 × 36=500+706=1206mA>>590mA, and electronic equipment cannot normally start; When connecting R1, total starting current is: 500+70.6=570.6mA<590mA, and electronic equipment can normally start.
The embodiment of the present invention can power supply cross put after realize rapidly start, if during the fast approach exhaustion of electric quantity of power supply, by back facet current current limiting mechanism, effectively reduce electronic equipment unexpected power down shutdown risk.The embodiment of the present invention belongs to pure hardware plan, can the application of cross-platform, cross operating system, and not by platform and system constraint, highly versatile, has very high practical value.
In addition, electric voltage observation circuit and/or described control circuit and/or described charging circuit and the integrated setting of described emitting components, such as be integrated in backlight drive integrated circuit, thus reduce the cost of electronic equipment and the area of printed circuit board (PCB, PrintedCircuitBoard) further.
Fig. 5 is the structure composition schematic diagram of the electronic equipment of the embodiment of the present invention one, and as shown in Figure 5, described electronic equipment comprises: emitting components 51, power supply 52;
Electric voltage observation circuit 53, for detecting the magnitude of voltage for the power supply 52 of powering to described emitting components 51, described magnitude of voltage is for embodying the electricity of described power supply 52; According to described magnitude of voltage, generate control signal;
Control circuit 54, for responding described control signal, is communicated with the resistance of the control circuit 54 of described emitting components 51, to make the current value controlling when described power supply 52 is powered to described emitting components 51 according to the resistance connected.
It will be appreciated by those skilled in the art that the practical function of each circuit in the electronic equipment shown in Fig. 5 can refer to the associated description of aforementioned control method and understands.
Fig. 6 is the structure composition schematic diagram of the electronic equipment of the embodiment of the present invention two, and as shown in Figure 6, described electronic equipment comprises: emitting components 61, power supply 62;
Electric voltage observation circuit 63, for detecting the magnitude of voltage for the power supply 62 of powering to described emitting components 61, described magnitude of voltage is for embodying the electricity of described power supply 62; According to described magnitude of voltage, generate control signal;
Control circuit 64, for responding described control signal, is communicated with the resistance of the control circuit 64 of described emitting components 61, to make the current value controlling when described power supply 62 is powered to described emitting components 61 according to the resistance connected.
Described control circuit 64 comprises the first resistance 641 and the second resistance 642, and the resistance value of described first resistance 641 is greater than the resistance value of described second resistance 642; Described control circuit 64 also comprises switch 643, and described first resistance 641 is connected with described switch 643 respectively with described second resistance 642;
Described control circuit 64, also for controlling the operating state of described switch 643 to realize the resistance be communicated with in described control circuit 64; Wherein, when described switch 643 is the first operating state, described first resistance 641 is communicated with described control circuit 64; When described switch 643 is the second operating state, described second resistance 642 is communicated with described control circuit 64.
Described electric voltage observation circuit 63, also for judging the relation of described magnitude of voltage and threshold voltage; When described magnitude of voltage is greater than described threshold voltage, produce the second control information, described second control signal is described second operating state for controlling described switch 643; When described magnitude of voltage is less than or equal to described threshold voltage, produce the first control information, described first control signal is described first operating state for controlling described switch 643.
It will be appreciated by those skilled in the art that the practical function of each circuit in the electronic equipment shown in Fig. 6 can refer to the associated description of aforementioned control method and understands.
Fig. 7 is the structure composition schematic diagram of the electronic equipment of the embodiment of the present invention two, and as shown in Figure 7, described electronic equipment comprises: emitting components 71, power supply 72;
Electric voltage observation circuit 73, for detecting the magnitude of voltage for the power supply 72 of powering to described emitting components 71, described magnitude of voltage is for embodying the electricity of described power supply 72; According to described magnitude of voltage, generate control signal;
Control circuit 74, for responding described control signal, is communicated with the resistance of the control circuit 74 of described emitting components 71, to make the current value controlling when described power supply 72 is powered to described emitting components 71 according to the resistance connected.
Described control circuit 74 comprises the first resistance 741 and the second resistance 742, and the resistance value of described first resistance 741 is greater than the resistance value of described second resistance 742; Described control circuit 74 also comprises switch 743, and described first resistance 741 is connected with described switch 743 respectively with described second resistance 742;
Described control circuit 74, also for controlling the operating state of described switch 743 to realize the resistance be communicated with in described control circuit 74; Wherein, when described switch 743 is the first operating state, described first resistance 741 is communicated with described control circuit 74; When described switch 743 is the second operating state, described second resistance 742 is communicated with described control circuit 74.
Described electric voltage observation circuit 73, also for judging the relation of described magnitude of voltage and threshold voltage; When described magnitude of voltage is greater than described threshold voltage, produce the second control information, described second control signal is described second operating state for controlling described switch 743; When described magnitude of voltage is less than or equal to described threshold voltage, produce the first control information, described first control signal is described first operating state for controlling described switch 743.
Described electronic equipment also comprises adapter 75; Described emitting components 71 is connected with adapter 75, and described adapter 75 comprises charging circuit;
Described adapter 75, also for utilizing described charging circuit to export charging current to described emitting components 71 and electronic devices and components to be launched, powers to give described emitting components 71 and electronic devices and components to be launched; Wherein, when described switch 743 is described first operating state, the charging current value that described charging circuit exports is less than or equal to the current value of described emitting components 71 and the starting current value sum of described electronic devices and components to be launched, starts successfully to make described electronic devices and components to be launched.
Described electric voltage observation circuit 73 and/or described control circuit 74 and/or described charging circuit and the integrated setting of described emitting components 71.
It will be appreciated by those skilled in the art that the practical function of each circuit in the electronic equipment shown in Fig. 7 can refer to the associated description of aforementioned control method and understands.
Between technical scheme described in the embodiment of the present invention, when not conflicting, can combination in any.
In several embodiment provided by the present invention, should be understood that, disclosed method and smart machine, can realize by another way.Apparatus embodiments described above is only schematic, such as, the division of described unit, be only a kind of logic function to divide, actual can have other dividing mode when realizing, and as: multiple unit or assembly can be in conjunction with, maybe can be integrated into another system, or some features can be ignored, or do not perform.In addition, the coupling each other of shown or discussed each part or direct-coupling or communication connection can be by some interfaces, and the indirect coupling of equipment or unit or communication connection can be electrical, machinery or other form.
The above-mentioned unit illustrated as separating component or can may not be and physically separates, and the parts as unit display can be or may not be physical location, namely can be positioned at a place, also can be distributed in multiple network element; Part or all of unit wherein can be selected according to the actual needs to realize the object of the present embodiment scheme.
In addition, each functional unit in various embodiments of the present invention can all be integrated in second processing unit, also can be each unit individually as a unit, also can two or more unit in a unit integrated; Above-mentioned integrated unit both can adopt the form of hardware to realize, and the form that hardware also can be adopted to add SFU software functional unit realizes.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; change can be expected easily or replace, all should be encompassed within protection scope of the present invention.
Claims (10)
1. a control method, comprising:
Detect the magnitude of voltage being used for the power supply of powering to emitting components, described magnitude of voltage is for embodying the electricity of described power supply;
According to described magnitude of voltage, generate control signal;
Respond described control signal, be communicated with the resistance of the control circuit of described emitting components, with make by described control circuit according to connect resistance control described power supply give described emitting components power time current value.
2. control method according to claim 1, described control circuit comprises the first resistance and the second resistance, and the resistance value of described first resistance is greater than the resistance value of described second resistance; Described control circuit also comprises switch, and described first resistance is connected with described switch respectively with described second resistance;
The resistance of the control circuit of the described emitting components of described connection, comprising:
Control the operating state of described switch to realize the resistance be communicated with in described control circuit;
Wherein, when described switch is the first operating state, described first resistance is communicated with described control circuit;
When described switch is the second operating state, described second resistance is communicated with described control circuit.
3. control method according to claim 2, described according to described magnitude of voltage generation control signal, comprising:
Judge the relation of described magnitude of voltage and threshold voltage;
When described magnitude of voltage is greater than described threshold voltage, produce the second control information, described second control signal is described second operating state for controlling described switch;
When described magnitude of voltage is less than or equal to described threshold voltage, produce the first control information, described first control signal is described first operating state for controlling described switch.
4. control method according to claim 3, described emitting components is connected with adapter, and described adapter comprises charging circuit;
Utilize described charging circuit charging current to be exported to described emitting components and electronic devices and components to be launched, power to give described emitting components and electronic devices and components to be launched;
When described switch is described first operating state, the charging current value that described charging circuit exports is less than or equal to the current value of described emitting components and the starting current value sum of described electronic devices and components to be launched, starts successfully to make described electronic devices and components to be launched.
5. control method according to claim 4, detects the magnitude of voltage of the power supply being used for powering to emitting components by electric voltage observation circuit; Described electric voltage observation circuit and/or described control circuit and/or described charging circuit and the integrated setting of described emitting components.
6. an electronic equipment, comprising: emitting components, power supply;
Electric voltage observation circuit, for detecting the magnitude of voltage for the power supply of powering to described emitting components, described magnitude of voltage is for embodying the electricity of described power supply; According to described magnitude of voltage, generate control signal;
Control circuit, for responding described control signal, is communicated with the resistance of the control circuit of described emitting components, with make according to connect resistance control described power supply give described emitting components power time current value.
7. electronic equipment according to claim 6, described control circuit comprises the first resistance and the second resistance, and the resistance value of described first resistance is greater than the resistance value of described second resistance; Described control circuit also comprises switch, and described first resistance is connected with described switch respectively with described second resistance;
Described control circuit, also for controlling the operating state of described switch to realize the resistance be communicated with in described control circuit; Wherein, when described switch is the first operating state, described first resistance is communicated with described control circuit; When described switch is the second operating state, described second resistance is communicated with described control circuit.
8. electronic equipment according to claim 7, described electric voltage observation circuit, also for judging the relation of described magnitude of voltage and threshold voltage; When described magnitude of voltage is greater than described threshold voltage, produce the second control information, described second control signal is described second operating state for controlling described switch; When described magnitude of voltage is less than or equal to described threshold voltage, produce the first control information, described first control signal is described first operating state for controlling described switch.
9. electronic equipment according to claim 8, described electronic equipment also comprises adapter; Described emitting components is connected with adapter, and described adapter comprises charging circuit;
Described adapter, also for utilizing described charging circuit to export charging current to described emitting components and electronic devices and components to be launched, powers to give described emitting components and electronic devices and components to be launched; Wherein, when described switch is described first operating state, the charging current value that described charging circuit exports is less than or equal to the current value of described emitting components and the starting current value sum of described electronic devices and components to be launched, starts successfully to make described electronic devices and components to be launched.
10. electronic equipment according to claim 9, described electric voltage observation circuit and/or described control circuit and/or described charging circuit and the integrated setting of described emitting components.
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