CN106961214A - A kind of boost control circuit, its driving method and display device - Google Patents
A kind of boost control circuit, its driving method and display device Download PDFInfo
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- CN106961214A CN106961214A CN201710249923.4A CN201710249923A CN106961214A CN 106961214 A CN106961214 A CN 106961214A CN 201710249923 A CN201710249923 A CN 201710249923A CN 106961214 A CN106961214 A CN 106961214A
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1584—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
- H02M3/07—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a kind of boost control circuit, its driving method and display device, including：Electric charge pump module, boost switching module and processing and control module；Processing and control module detects the voltage of power supply end, when it is determined that the voltage of power supply end is not more than threshold voltage, only power supply end and electric charge pump module are turned on, electric charge pump module will export after the boost in voltage of power supply end according to the first preset rules when being turned on power supply end and give boost switching module；Exported after the boost in voltage that boost switching module exports electric charge pump module according to the second preset rules to voltage output end；When it is determined that the voltage of power supply end is more than threshold voltage, only power supply end and boost switching module are turned on；Boost switching module will be exported to voltage output end when being turned on power supply end according to the second preset rules after the boost in voltage of power supply end, and when the voltage of power supply end is different, conversion efficiency is improved using different boost modes.
Description
Technical Field
The invention relates to the technical field of display, in particular to a boost control circuit, a driving method thereof and a display device.
Background
Notebook products have been popular for their portability. At present, the notebook computer product generally adopts an external power adapter or a battery to provide a power supply voltage, wherein the power supply voltage of the power adapter is generally between 5V and 21V, and the power supply voltage of the battery is generally between 5V and 9V. However, the voltage required for the backlight of the notebook product to work normally is generally 35V. Therefore, a voltage boost circuit is generally used to boost the power supply voltage of the power adapter or the power supply voltage of the battery to 35V to ensure the normal operation of the backlight. However, the conventional booster circuit, as shown in fig. 1, includes: the circuit comprises an inductor L0, a diode D0, a first capacitor C01, a second capacitor C02, a transistor SW0, a first resistor R01 and a second resistor R02. The voltage of the power supply terminal VIN is input into the inductor L0, and the transistor SW0 under the control of the pulse signal terminal PS enables the inductor L0 to generate an induced electromotive force in the same direction as the voltage of the power supply terminal VIN, so that the voltage output terminal VOUT outputs a voltage higher than the voltage of the power supply terminal VIN. Fig. 2 is a simulation diagram of the conversion efficiency of the boost circuit shown in fig. 1, and the voltage of the power output terminal VOUT is 35V, and the output current is 90 mA. The abscissa in fig. 2 represents the voltage of the power supply terminal VIN, and the ordinate represents the conversion efficiency. As can be seen from fig. 2, when the voltage of the power supply terminal VIN is 4.5V, the conversion efficiency is about 68%. Therefore, the conversion efficiency of the boost circuit is low, which affects the service life of the battery.
Disclosure of Invention
The embodiment of the invention provides a boost control circuit, a driving method thereof and a display device, which are used for solving the problems that the conversion efficiency of the boost circuit in the prior art is low and the service life of a battery is influenced.
Therefore, an embodiment of the present invention provides a boost control circuit, including: the device comprises a charge pump module, a switch boosting module and a processing control module; wherein,
the processing control module is respectively connected with a power supply end, the charge pump module and the switch boosting module and is used for detecting the voltage of the power supply end, only conducting the power supply end and the charge pump module when the detected voltage of the power supply end is determined to be not more than a threshold voltage, and only conducting the power supply end and the switch boosting module when the detected voltage of the power supply end is determined to be more than the threshold voltage;
the charge pump module is also connected with the switch boosting module and is used for boosting the voltage of the power supply end and outputting the boosted voltage to the switch boosting module according to a first preset rule when the charge pump module is conducted with the power supply end;
the switch boosting module is also connected with a voltage output end and used for boosting the voltage output by the charge pump module according to a second preset rule and then outputting the boosted voltage to the voltage output end, and when the switch boosting module is conducted with the power supply end, boosting the voltage of the power supply end according to the second preset rule and then outputting the boosted voltage to the voltage output end.
Preferably, in the above boost control circuit provided in an embodiment of the present invention, the charge pump module includes: the first diode, the second diode and the first capacitor; wherein,
the anode of the first diode is connected with the processing control module, and the cathode of the first diode is connected with the anode of the second diode;
the negative electrode of the second diode is connected with the switch boosting module;
the first end of the first capacitor is connected with the cathode of the first diode, and the second end of the first capacitor is connected with the square wave signal end;
the first preset rule satisfies the formula: v1＝Vin+Vpk-Vd1-Vd2(ii) a Wherein, V1Voltage, V, representing the cathode of the second diodeinRepresenting the voltage at the supply terminal, VpkRepresents the said partyVoltage amplitude, V, of the signal at the wave signal terminald1Representing the voltage drop of said first diode, Vd2Representing the voltage drop of said second diode.
Preferably, in the boost control circuit provided in the embodiment of the present invention, the charge pump module further includes: a second capacitor; the first end of the second capacitor is connected with the anode of the first diode, and the second end of the second capacitor is connected with the ground terminal.
Preferably, in the boost control circuit provided in an embodiment of the present invention, the switch boost module includes: an inductor, a transistor and a third diode; wherein,
the first end of the inductor is connected with the processing control module and the charge pump module respectively, and the second end of the inductor is connected with the anode of the third diode;
the cathode of the third diode is connected with the voltage output end;
the control electrode of the transistor is connected with the pulse signal end, the first electrode of the transistor is connected with the anode of the third diode, and the second electrode of the transistor is connected with the ground end;
the second preset rule satisfies the formula:wherein, VoutRepresenting the voltage at said voltage output terminal, V0Representing the voltage at the first end of the inductor and DR representing the duty cycle of the signal at the pulse signal end.
Preferably, in the boost control circuit provided in the embodiment of the present invention, the switch boost module further includes: a third capacitor; the first end of the third capacitor is connected with the first end of the inductor, and the second end of the third capacitor is connected with the grounding end; or,
the switch boost module further includes: a fourth capacitor; the first end of the fourth capacitor is connected with the voltage output end, and the second end of the fourth capacitor is connected with the grounding end; or,
the switch boost module further includes: a first resistor and a second resistor; the first end of the first resistor is connected with the voltage output end, the second end of the first resistor is respectively connected with the first end of the second resistor and the feedback signal output end, and the second end of the second resistor is connected with the grounding end.
Preferably, in the boost control circuit provided in an embodiment of the present invention, the processing control module includes: the data processing submodule and the switch control submodule; wherein,
the data processing submodule is respectively connected with the power supply end and the switch control submodule and is used for detecting the voltage of the power supply end, outputting a first control signal to the switch control submodule when the detected voltage of the power supply end is determined to be not more than the threshold voltage, and outputting a second control signal to the switch control submodule when the detected voltage of the power supply end is determined to be more than the threshold voltage;
the switch control submodule is also respectively connected with the power supply end, the charge pump module and the switch boosting module, and is used for conducting the power supply end and the charge pump module only when receiving the first control signal, and conducting the power supply end and the switch boosting module only when receiving the second control signal.
Preferably, in the boost control circuit provided in the embodiment of the present invention, the switch control submodule includes: a first switch and a second switch; wherein,
the first end of the first switch is connected with the power supply end, the second end of the first switch is connected with the charge pump module, and the control end of the first switch is connected with the data processing submodule;
the first end of the second switch is connected with the power supply end, the second end of the second switch is connected with the switch boosting module, and the control end of the second switch is connected with the data processing submodule.
Preferably, in the boost control circuit provided in an embodiment of the present invention, the data processing sub-module includes: a processor; the input end of the processor is connected with the power supply end, and the output end of the processor is connected with the switch control submodule.
Correspondingly, the embodiment of the invention also provides a display device which comprises any one of the boosting control circuits provided by the embodiment of the invention.
Correspondingly, an embodiment of the present invention further provides a control method of any one of the above boosting control circuits provided in the embodiment of the present invention, including:
the processing control module detects the voltage of the power supply end;
the processing control module only conducts the power supply end and the charge pump module when determining that the detected voltage of the power supply end is not greater than the threshold voltage; the charge pump module boosts the voltage of the power supply end according to the first preset rule and outputs the boosted voltage to the switch boosting module; the switch boosting module boosts the voltage output by the charge pump module according to the second preset rule and outputs the boosted voltage to the voltage output end;
when the processing control module determines that the detected voltage of the power supply end is greater than the threshold voltage, only conducting the power supply end and the switch boosting module; and the switch boosting module boosts the voltage of the power supply end according to the second preset rule and outputs the boosted voltage to the voltage output end.
The invention has the following beneficial effects:
the boost control circuit, the driving method thereof and the display device provided by the embodiment of the invention comprise the following steps: the device comprises a charge pump module, a switch boosting module and a processing control module; the processing control module is used for detecting the voltage of the power supply end, only conducting the power supply end and the charge pump module when the detected voltage of the power supply end is not larger than a threshold voltage, and disconnecting the power supply end and the switch boosting module at the moment; the switch boosting module is used for boosting the voltage output by the charge pump module according to a second preset rule and then outputting the boosted voltage to the voltage output end, so that the voltage of the power supply end can be boosted by adopting a boosting mode when the voltage of the power supply end is not greater than the threshold voltage. When the processing control module determines that the detected voltage of the power supply end is greater than the threshold voltage, the power supply end is only connected with the switch boosting module, the power supply end is disconnected with the charge pump module at the moment, the charge pump module does not work, and the switch boosting module is used for boosting the voltage of the power supply end and then outputting the boosted voltage to the voltage output end according to a second preset rule when the switch boosting module is connected with the power supply end, so that the voltage of the power supply end can be boosted by adopting another boosting mode when the voltage of the power supply end is greater than the threshold voltage. Therefore, the boost control circuit provided by the embodiment of the invention can adopt different boost modes when the voltages of the power supply ends are different, thereby improving the conversion efficiency.
Drawings
Fig. 1 is a schematic diagram of a specific structure of a boosting circuit in the prior art;
FIG. 2 is a schematic diagram of the conversion efficiency of the boost circuit shown in FIG. 1;
fig. 3 is a schematic structural diagram of a boost control circuit according to an embodiment of the present invention;
fig. 4 is a second schematic structural diagram of the boost control circuit according to the embodiment of the present invention;
FIG. 5a is a schematic diagram of a specific structure of the boost control circuit shown in FIG. 4;
FIG. 5b is a second schematic diagram of the boosting control circuit shown in FIG. 4;
FIG. 6 is a schematic diagram of the conversion efficiency of the boost control circuit shown in FIG. 5 b;
fig. 7 is a flowchart of a driving method according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, specific embodiments of a boost control circuit, a driving method thereof and a display device according to an embodiment of the present invention are described in detail below with reference to the accompanying drawings. It should be understood that the preferred embodiments described below are only for illustrating and explaining the present invention and are not to be used for limiting the present invention. And the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
An embodiment of the present invention provides a boost control circuit, as shown in fig. 3, including: the charge pump module 10, the switch boosting module 20 and the processing control module 30; wherein,
the processing control module 30 is respectively connected to the power supply terminal VIN, the charge pump module 10 and the switch boosting module 20, and is configured to detect a voltage of the power supply terminal VIN, only connect the power supply terminal VIN with the charge pump module 10 when it is determined that the detected voltage of the power supply terminal VIN is not greater than a threshold voltage, and only connect the power supply terminal VIN with the switch boosting module 20 when it is determined that the detected voltage of the power supply terminal VIN is greater than the threshold voltage;
the charge pump module 10 is further connected to the switch boosting module 20, and configured to boost a voltage of the power supply terminal VIN according to a first preset rule and output the boosted voltage to the switch boosting module 20 when the VIN is conducted with the power supply terminal;
the switch boosting module 20 is further connected to the voltage output terminal VOUT, and is configured to boost the voltage output by the charge pump module 10 according to a second preset rule and output the boosted voltage to the voltage output terminal VOUT, and when the switch boosting module is turned on with the power supply terminal VIN, boost the voltage of the power supply terminal VIN according to the second preset rule and output the boosted voltage to the voltage output terminal VOUT.
The boost control circuit provided by the embodiment of the invention comprises: the device comprises a charge pump module, a switch boosting module and a processing control module; the processing control module is used for detecting the voltage of the power supply end, only conducting the power supply end and the charge pump module when the detected voltage of the power supply end is not larger than a threshold voltage, and disconnecting the power supply end and the switch boosting module at the moment; the switch boosting module is used for boosting the voltage output by the charge pump module according to a second preset rule and then outputting the boosted voltage to the voltage output end, so that the voltage of the power supply end can be boosted by adopting a boosting mode when the voltage of the power supply end is not greater than the threshold voltage. When the processing control module determines that the detected voltage of the power supply end is greater than the threshold voltage, the power supply end is only connected with the switch boosting module, the power supply end is disconnected with the charge pump module at the moment, the charge pump module does not work, and the switch boosting module is used for boosting the voltage of the power supply end and then outputting the boosted voltage to the voltage output end according to a second preset rule when the switch boosting module is connected with the power supply end, so that the voltage of the power supply end can be boosted by adopting another boosting mode when the voltage of the power supply end is greater than the threshold voltage. Therefore, the boost control circuit provided by the embodiment of the invention can adopt different boost modes when the voltages of the power supply ends are different, thereby improving the conversion efficiency.
In practical implementation, in the boost control circuit provided in the embodiment of the present invention, the threshold voltage may be 12V, or 8V, or 5V. Of course, in practical applications, the threshold voltage needs to be designed and determined according to practical application environments, and is not limited herein.
In a specific implementation, in the boost control circuit provided in the embodiment of the present invention, the first preset rule and the second preset rule need to be designed and determined according to an actual application environment, which is not limited herein.
In a specific implementation, in the boost control circuit provided in the embodiment of the present invention, as shown in fig. 4, the processing control module 30 may specifically include: a data processing submodule 31 and a switch control submodule 32; wherein,
the data processing submodule 31 is respectively connected with the power supply terminal VIN and the switch control submodule 32, and is configured to detect a voltage of the power supply terminal VIN, output a first control signal to the switch control submodule 32 when it is determined that the detected voltage of the power supply terminal VIN is not greater than a threshold voltage, and output a second control signal to the switch control submodule 32 when it is determined that the detected voltage of the power supply terminal VIN is greater than the threshold voltage;
the switch control submodule 32 is further connected to the power supply terminal VIN, the charge pump module 10 and the switch boosting module 20, and is configured to only conduct the power supply terminal VIN with the charge pump module 10 when receiving the first control signal, and only conduct the power supply terminal VIN with the switch boosting module 20 when receiving the second control signal.
The present invention will be described in detail with reference to specific examples. It should be noted that the present embodiment is intended to better explain the present invention, but not to limit the present invention.
Specifically, in practical implementation, in the boost control circuit provided in the embodiment of the present invention, as shown in fig. 5a and 5b, the switch control sub-module 32 may specifically include: a first switch S1 and a second switch S2; wherein,
a first terminal of the first switch S1 is connected to the power supply terminal VIN, a second terminal of the first switch S1 is connected to the charge pump module 10, and a control terminal of the first switch S1 is connected to the data processing submodule 31;
a first terminal of the second switch S2 is connected to the power supply terminal VIN, a second terminal of the second switch S2 is connected to the switch boosting module 20, and a control terminal of the second switch S2 is connected to the data processing submodule 31.
In a specific implementation, in the boost control circuit provided in the embodiment of the present invention, as shown in fig. 5a and 5b, the first switch S1 may be an N-type transistor, the second switch S2 may be a P-type transistor, the first control signal is a high-level signal, and the second control signal is a low-level signal. Alternatively, the first switch may be a P-type transistor, the second switch may be an N-type transistor, the first control signal is a low-potential signal, and the second control signal is a high-potential signal, which is not limited herein. Of course, the first switch and the second switch may also be other devices having a switching function, which are not limited herein and are all the contents to be protected by the present invention.
In a specific implementation manner, in the boost control circuit provided in the embodiment of the present invention, the second switch is turned off under the control of the first control signal, and the first switch is turned on under the control of the first control signal and supplies the voltage of the power supply terminal to the charge pump module. The first switch is turned off under the control of the second control signal, and the second switch is turned on under the control of the second control signal and supplies the voltage of the power supply terminal to the switch boosting module.
Specifically, in practical implementation, in the boost control circuit provided in the embodiment of the present invention, as shown in fig. 5a and 5b, the data processing sub-module 31 may specifically include: a processor MCU; the input end of the processor MCU is connected to the power supply terminal VIN, and the output end is connected to the switch control submodule 31.
In a specific implementation, in the boost control circuit provided in the embodiment of the present invention, a specific structure of a processor is the same as that in the prior art, which should be understood by those skilled in the art, and details are not described herein, and should not be construed as limiting the present invention.
Specifically, in practical implementation, in the boost control circuit provided in the embodiment of the present invention, as shown in fig. 5a, the charge pump module 10 may specifically include: a first diode D1, a second diode D2, and a first capacitor C1; wherein,
the anode of the first diode D1 is connected with the processing control module, and the cathode of the first diode D1 is connected with the anode of the second diode D2;
the cathode of the second diode D2 is connected to the switching boost module 20;
a first end of the first capacitor C1 is connected with the cathode of the first diode D1, and a second end of the first capacitor C1 is connected with the square wave signal terminal LX;
the first preset rule satisfies the formula: v1＝Vin+Vpk-Vd1-Vd2(ii) a Wherein, V1Voltage, V, representing the cathode of the second diode D2inRepresenting the voltage of the power supply terminal VINpkVoltage amplitude, V, of a signal representing a square-wave signal terminal LXd1Representing the voltage drop, V, of the first diode D1d2Representing the voltage drop of the second diode D2.
In a specific implementation, in the boost control circuit provided in the embodiment of the present invention, as shown in fig. 5b, the charge pump module 10 may further include: a second capacitance C2; a first terminal of the second capacitor C2 is connected to the anode of the first diode D1, and a second terminal of the second capacitor C2 is connected to the ground GND. Therefore, the voltage input by the power supply end VIN can be filtered.
In a specific implementation, in the boost control circuit provided in the embodiment of the present invention, the signal at the square-wave signal end is a signal having a Pulse Width Modulation (PWM) waveform, and the voltage amplitude of the signal at the square-wave signal end is the same as the voltage at the power supply end, that is, the high voltage at the square-wave signal end is the same as the voltage at the power supply end. The duty ratio of the signal at the square wave signal end needs to be determined according to the design of the practical application environment, and is not limited herein.
In a specific implementation, in the boost control circuit provided in the embodiment of the present invention, the first diode and the second diode are diodes with low conduction voltage drop, so as to improve the conversion efficiency as much as possible. In practical applications, the conduction voltage drop of the first diode and the second diode may be 0.1V. Of course, the conduction voltage drop of the first diode and the second diode needs to be designed and determined according to the practical application environment, and is not limited herein,
specifically, in a specific implementation, in the boost control circuit provided in the embodiment of the present invention, as shown in fig. 5a, the switching boost module 20 may specifically include: an inductor L, a transistor SW, and a third diode D3; wherein,
a first end of the inductor L is connected to the processing control module and the charge pump module 10, respectively, and a second end of the inductor L is connected to the anode of the third diode D3;
the cathode of the third diode D3 is connected to the voltage output terminal VOUT;
a control electrode of the transistor SW is connected with the pulse signal terminal PS, a first electrode of the transistor SW is connected with an anode of the third diode D3, and a second electrode of the transistor SW is connected with the ground terminal GND;
the second preset rule satisfies the formula:wherein, VoutRepresenting the voltage, V, of the voltage output terminal VOUT0Representing the voltage at the first terminal of the inductor L and DR representing the duty cycle of the signal at the pulsed signal terminal PS.
In a specific implementation, in the boost control circuit provided in the embodiment of the present invention, as shown in fig. 5b, the switching boost module 20 may further include: a third capacitance C3; wherein,
a first terminal of the third capacitor C3 is connected to the first terminal of the inductor L, and a second terminal of the third capacitor C3 is connected to the ground GND. This may filter the voltage at the first terminal of the input inductor L.
As shown in fig. 5b, the switching boost module may further include: a fourth capacitance C4; wherein,
a first terminal of the fourth capacitor C4 is connected to the voltage output terminal VOUT, and a second terminal of the fourth capacitor C4 is connected to the ground terminal GND. Therefore, the voltage of the input voltage output end VOUT can be filtered.
As shown in fig. 5b, the switching boost module may further include: a first resistor R1 and a second resistor R2; wherein,
a first end of the first resistor R1 is connected to the voltage output terminal VOUT, a second end of the first resistor R1 is connected to a first end of the second resistor R2 and the feedback signal output terminal FB, and a second end of the second resistor R2 is connected to the ground terminal GND. Thus, the feedback control can be performed by detecting the voltage of the feedback signal output terminal FB.
In a specific implementation, in the boost control circuit provided in the embodiment of the present invention, the third diode is a diode with a low conduction voltage drop, so as to improve the conversion efficiency as much as possible. In practical applications, the conduction voltage drop of the third diode may be 0.1V. Of course, the conduction voltage drop of the third diode needs to be designed and determined according to the practical application environment, and is not limited herein, and in practical application, the third diode may be a schottky diode. Of course, the third diode may be another type of diode, and is not limited herein.
In specific implementation, in the boost control circuit provided in the embodiment of the present invention, the signal at the pulse signal end is a signal having a PWM waveform, and the duty ratio of the signal at the pulse signal end needs to be determined according to a design of an actual application environment, which is not limited herein.
In a specific implementation, in the boost control circuit provided in the embodiment of the present invention, the transistor may be an N-type transistor; alternatively, the transistor may be a P-type transistor, which is not limited herein.
In a specific implementation, in the boost control circuit provided in the embodiment of the present invention, the transistor generates an induced electromotive force in the same direction as the voltage of the first end of the inductor by the control of the pulse signal end, so that the voltage output end outputs a voltage higher than the power supply end, thereby implementing the boost function.
The above is merely an example of the specific structure of each module in the boost control circuit, and in the specific implementation, the specific structure of each module is not limited to the structure provided in the embodiment of the present invention, and may be other structures known to those skilled in the art, and is not limited herein.
The Transistor in the above embodiments of the present invention may be a Thin Film Transistor (TFT) or a Metal oxide semiconductor field effect Transistor (MOS), and is not limited herein. In a specific implementation, the gates of the transistors are used as control electrodes, and the first electrode is set as a source or a drain and the second electrode is set as a drain or a source according to the type of the transistors and the input signal, which is not limited herein.
The operation of the present invention will be described with reference to the specific structure of the boost control circuit shown in fig. 5b as an example. Here, the threshold voltage is described as 12V.
The MCU of the processor detects the voltage V of the VIN of the power supply endinDetermining the voltage V of the detected supply terminal VINinWhen the voltage is not greater than 12V, the first control signal is output to the first switch S1 and the second switch S2, so that the first switch S1 is closed and the second switch S2 is opened, and thus the power supply terminal VIN and the anode of the first diode D1 are turned on. Voltage V of power supply terminal VINinThe signal is output through the first diode D1 and the second diode D2, and the signal of the square wave signal terminal LX charges the first capacitor C1, so that the first capacitor C1 has VpkAt voltage of, at this time VpkIs output through the second diode D2, so that the voltage V of the cathode of the second diode D21Satisfies the formula: v1＝Vin+Vpk-Vd1-Vd2I.e. the voltage boosted by the charge pump module. At this time, the voltage V of the first end of the inductor L0＝V1The transistor SW enables the inductor L to generate the voltage V under the control of the pulse signal end PS1Induced electromotive force with the same direction enables the voltage V of the voltage output end VOUToutSatisfies the formula:
the MCU of the processor detects the voltage V of the VIN of the power supply endinDetermining the voltage V of the detected supply terminal VINinWhen the voltage is greater than 12V, the second control signal is output to the first switch S1 and the second switch S2, so that the first switch S1 is turned off and the second switch S2 is turned on, and therefore, the power supply terminal VIN is disconnected from the positive electrode of the first diode D1 and is connected to the first end of the inductor L. Voltage V of power supply terminal VINinFirst terminal of input inductance L, i.e. V1＝VinThe transistor SW enables the inductor L to generate the voltage V under the control of the pulse signal end PS1Induced electromotive force with the same direction enables the voltage V of the voltage output end VOUToutSatisfies the formula:
a schematic diagram of a simulation performed by taking the boost control circuit shown in fig. 5b as an example, in which the threshold voltage is 12V, the voltage of the voltage output terminal is 35V, and the current of the voltage output terminal is 90mA, is shown in fig. 6. Wherein the abscissa represents the voltage of the power supply terminal, and the ordinate represents the conversion efficiency. As can be seen from fig. 6, the conversion efficiency can reach 87% when the voltage at the power supply terminal is 4.5V. As can be seen from fig. 2, the conversion efficiency of the boosting circuit in the prior art is 68% when the voltage of the power supply terminal is 4.5V. Therefore, when the voltage of the power supply end is less than the threshold voltage and is 12V, the boost control circuit provided by the embodiment of the invention adopts a different mode from the boost circuit in the prior art, so that the conversion efficiency can be improved, and the power consumption can be reduced.
Based on the same inventive concept, an embodiment of the present invention further provides a method for driving any one of the above boost control circuits, as shown in fig. 7, including:
s701, detecting the voltage of a power supply end by a processing control module; the processing control module executes step S702 when determining that the detected voltage of the power supply terminal is not greater than the threshold voltage; the processing control module executes step S703 when determining that the detected voltage of the power supply terminal is greater than the threshold voltage;
s702, only conducting a power supply end and a charge pump module; the charge pump module boosts the voltage of a power supply end according to a first preset rule and outputs the boosted voltage to the switch boosting module; the switch boosting module boosts the voltage output by the charge pump module according to a second preset rule and outputs the boosted voltage to a voltage output end;
s703, only conducting a power supply end and the switch boosting module; and the switch boosting module boosts the voltage of the power supply end according to a second preset rule and outputs the boosted voltage to the voltage output end.
According to the driving method provided by the embodiment of the invention, different boosting modes can be adopted when the voltages of the power supply ends are different, so that the conversion efficiency is improved, and the power consumption is reduced.
In a specific implementation, in the driving method provided in the embodiment of the present invention, the processing control module may specifically include a data processing sub-module and a switch control sub-module, and the driving method may specifically include:
the data processing submodule detects the voltage of a power supply end;
the data processing submodule outputs a first control signal to the switch control submodule when determining that the detected voltage of the power supply end is not greater than the threshold voltage; when receiving a first control signal, the switch control submodule conducts only the power supply end and the charge pump module;
the data processing submodule outputs a second control signal to the switch control submodule when determining that the detected voltage of the power supply end is greater than the threshold voltage; and when receiving the second control signal, the switch control submodule only conducts the power supply end with the switch boosting module.
Based on the same inventive concept, the embodiment of the invention further provides a display device, which comprises any one of the boosting control circuits provided by the embodiment of the invention. The principle of the display device to solve the problem is similar to the boost control circuit, so the implementation of the display device can be referred to the implementation of the boost control circuit, and repeated details are not repeated here.
In a specific implementation, the display device provided in the embodiment of the present invention may be: any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like. Other essential components of the display device are understood by those skilled in the art, and are not described herein or should not be construed as limiting the invention.
In a specific implementation, when the display device provided in the embodiment of the present invention is a notebook computer, the power supply terminal of the boost control circuit is connected to the power adapter of the notebook computer and the output terminal of the battery of the notebook computer. The voltage output end of the boost control circuit is connected with the voltage input end of the backlight source of the notebook computer. Therefore, when the notebook computer is powered by the battery, the service life of the battery can be prolonged.
The boost control circuit, the driving method thereof and the display device provided by the embodiment of the invention comprise the following steps: the device comprises a charge pump module, a switch boosting module and a processing control module; the processing control module is used for detecting the voltage of the power supply end, only conducting the power supply end and the charge pump module when the detected voltage of the power supply end is not larger than a threshold voltage, and disconnecting the power supply end and the switch boosting module at the moment; the switch boosting module is used for boosting the voltage output by the charge pump module according to a second preset rule and then outputting the boosted voltage to the voltage output end, so that the voltage of the power supply end can be boosted by adopting a boosting mode when the voltage of the power supply end is not greater than the threshold voltage. When the processing control module determines that the detected voltage of the power supply end is greater than the threshold voltage, the power supply end is only connected with the switch boosting module, the power supply end is disconnected with the charge pump module at the moment, the charge pump module does not work, and the switch boosting module is used for boosting the voltage of the power supply end and then outputting the boosted voltage to the voltage output end according to a second preset rule when the switch boosting module is connected with the power supply end, so that the voltage of the power supply end can be boosted by adopting another boosting mode when the voltage of the power supply end is greater than the threshold voltage. Therefore, the boost control circuit provided by the embodiment of the invention can adopt different boost modes when the voltages of the power supply ends are different, thereby improving the conversion efficiency.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A boost control circuit, comprising: the device comprises a charge pump module, a switch boosting module and a processing control module; wherein,
the processing control module is respectively connected with a power supply end, the charge pump module and the switch boosting module and is used for detecting the voltage of the power supply end, only conducting the power supply end and the charge pump module when the detected voltage of the power supply end is determined to be not more than a threshold voltage, and only conducting the power supply end and the switch boosting module when the detected voltage of the power supply end is determined to be more than the threshold voltage;
the charge pump module is also connected with the switch boosting module and is used for boosting the voltage of the power supply end and outputting the boosted voltage to the switch boosting module according to a first preset rule when the charge pump module is conducted with the power supply end;
the switch boosting module is also connected with a voltage output end and used for boosting the voltage output by the charge pump module according to a second preset rule and then outputting the boosted voltage to the voltage output end, and when the switch boosting module is conducted with the power supply end, boosting the voltage of the power supply end according to the second preset rule and then outputting the boosted voltage to the voltage output end.
2. The boost control circuit of claim 1, wherein the charge pump module comprises: the first diode, the second diode and the first capacitor; wherein,
the anode of the first diode is connected with the processing control module, and the cathode of the first diode is connected with the anode of the second diode;
the negative electrode of the second diode is connected with the switch boosting module;
the first end of the first capacitor is connected with the cathode of the first diode, and the second end of the first capacitor is connected with the square wave signal end;
the first preset rule satisfies the formula: v1＝Vin+Vpk-Vd1-Vd2(ii) a Wherein, V1Voltage, V, representing the cathode of the second diodeinRepresenting the voltage at the supply terminal, VpkVoltage amplitude, V, of a signal representative of said square-wave signal terminald1Representing the voltage drop of said first diode, Vd2Representing the voltage drop of said second diode.
3. The boost control circuit of claim 2, wherein the charge pump module further comprises: a second capacitor; the first end of the second capacitor is connected with the anode of the first diode, and the second end of the second capacitor is connected with the ground terminal.
4. A boost control circuit in accordance with claim 1, wherein said switching boost module comprises: an inductor, a transistor and a third diode; wherein,
the first end of the inductor is connected with the processing control module and the charge pump module respectively, and the second end of the inductor is connected with the anode of the third diode;
the cathode of the third diode is connected with the voltage output end;
the control electrode of the transistor is connected with the pulse signal end, the first electrode of the transistor is connected with the anode of the third diode, and the second electrode of the transistor is connected with the ground end;
the second preset rule satisfies the formula:wherein, VoutRepresenting the voltage at said voltage output terminal, V0Representing the voltage at the first end of the inductor and DR representing the duty cycle of the signal at the pulse signal end.
5. A boost control circuit in accordance with claim 4, wherein said switching boost module further comprises: a third capacitor; the first end of the third capacitor is connected with the first end of the inductor, and the second end of the third capacitor is connected with the grounding end; or,
the switch boost module further includes: a fourth capacitor; the first end of the fourth capacitor is connected with the voltage output end, and the second end of the fourth capacitor is connected with the grounding end; or,
the switch boost module further includes: a first resistor and a second resistor; the first end of the first resistor is connected with the voltage output end, the second end of the first resistor is respectively connected with the first end of the second resistor and the feedback signal output end, and the second end of the second resistor is connected with the grounding end.
6. A boost control circuit according to claim 1, wherein the process control module comprises: the data processing submodule and the switch control submodule; wherein,
the data processing submodule is respectively connected with the power supply end and the switch control submodule and is used for detecting the voltage of the power supply end, outputting a first control signal to the switch control submodule when the detected voltage of the power supply end is determined to be not more than the threshold voltage, and outputting a second control signal to the switch control submodule when the detected voltage of the power supply end is determined to be more than the threshold voltage;
the switch control submodule is also respectively connected with the power supply end, the charge pump module and the switch boosting module, and is used for conducting the power supply end and the charge pump module only when receiving the first control signal, and conducting the power supply end and the switch boosting module only when receiving the second control signal.
7. A boost control circuit in accordance with claim 6, wherein the switch control submodule comprises: a first switch and a second switch; wherein,
the first end of the first switch is connected with the power supply end, the second end of the first switch is connected with the charge pump module, and the control end of the first switch is connected with the data processing submodule;
the first end of the second switch is connected with the power supply end, the second end of the second switch is connected with the switch boosting module, and the control end of the second switch is connected with the data processing submodule.
8. A boost control circuit according to claim 6, wherein the data processing sub-module comprises: a processor; the input end of the processor is connected with the power supply end, and the output end of the processor is connected with the switch control submodule.
9. A display device comprising the boost control circuit according to any one of claims 1 to 8.
10. A control method of a boost control circuit according to any one of claims 1 to 8, comprising:
the processing control module detects the voltage of the power supply end;
the processing control module only conducts the power supply end and the charge pump module when determining that the detected voltage of the power supply end is not greater than the threshold voltage; the charge pump module boosts the voltage of the power supply end according to the first preset rule and outputs the boosted voltage to the switch boosting module; the switch boosting module boosts the voltage output by the charge pump module according to the second preset rule and outputs the boosted voltage to the voltage output end;
when the processing control module determines that the detected voltage of the power supply end is greater than the threshold voltage, only conducting the power supply end and the switch boosting module; and the switch boosting module boosts the voltage of the power supply end according to the second preset rule and outputs the boosted voltage to the voltage output end.
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| CN201710249923.4A CN106961214A (en) | 2017-04-17 | 2017-04-17 | A kind of boost control circuit, its driving method and display device |
| PCT/CN2018/077393 WO2018192303A1 (en) | 2017-04-17 | 2018-02-27 | Boost control circuit, driving method therefor and display device |
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| CN201710249923.4A CN106961214A (en) | 2017-04-17 | 2017-04-17 | A kind of boost control circuit, its driving method and display device |
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| WO2020082524A1 (en) * | 2018-10-25 | 2020-04-30 | 惠科股份有限公司 | Power supply voltage compensation circuit of display panel, display panel, and display apparatus |
| CN111211684A (en) * | 2020-02-24 | 2020-05-29 | 北京京东方显示技术有限公司 | High voltage generation circuit, power management integrated circuit, and electronic device |
| CN111462708A (en) * | 2020-04-29 | 2020-07-28 | 深圳市华星光电半导体显示技术有限公司 | Voltage conversion circuit, voltage conversion method and display device |
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| CN112099559A (en) * | 2020-09-15 | 2020-12-18 | 无锡芯朋微电子股份有限公司 | Internal power supply generating circuit |
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| WO2018192303A1 (en) | 2018-10-25 |
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