WO2015188405A1 - 一种用于调整输出电压的电路及方法 - Google Patents

一种用于调整输出电压的电路及方法 Download PDF

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Publication number
WO2015188405A1
WO2015188405A1 PCT/CN2014/080957 CN2014080957W WO2015188405A1 WO 2015188405 A1 WO2015188405 A1 WO 2015188405A1 CN 2014080957 W CN2014080957 W CN 2014080957W WO 2015188405 A1 WO2015188405 A1 WO 2015188405A1
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Prior art keywords
output
level signal
voltage
switching transistor
internal component
Prior art date
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Ceased
Application number
PCT/CN2014/080957
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English (en)
French (fr)
Inventor
曹丹
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TCL China Star Optoelectronics Technology Co Ltd
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Shenzhen China Star Optoelectronics Technology Co Ltd
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Priority to US14/379,855 priority Critical patent/US9548663B2/en
Publication of WO2015188405A1 publication Critical patent/WO2015188405A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M3/00Conversion of DC power input into DC power output
    • H02M3/22Conversion of DC power input into DC power output with intermediate conversion into AC
    • H02M3/24Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
    • H02M3/28Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
    • H02M3/325Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33507Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M3/00Conversion of DC power input into DC power output
    • H02M3/22Conversion of DC power input into DC power output with intermediate conversion into AC
    • H02M3/24Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
    • H02M3/28Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
    • H02M3/325Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • H02M3/33576Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M1/00Details of apparatus for conversion
    • H02M1/0003Details of control, feedback or regulation circuits
    • H02M1/0025Arrangements for modifying reference values, feedback values or error values in the control loop of a converter

Definitions

  • the present invention relates to the field of electronic technology, and more particularly to a circuit and method for adjusting an output voltage. Background technique
  • the input DC voltage is usually converted to a different output voltage for different electronic devices.
  • the internal components are used.
  • a fixed voltage output mode is often used to convert an input DC voltage into an output voltage for use in a specified component of an electronic device.
  • the disadvantages are: When the internal component connected to the output voltage changes, the current internal component is before When the required output voltage difference between internal components is large, the voltage output mode cannot meet the current internal component usage requirements, and the voltage output transition mode needs to be redesigned, thereby increasing design cost and design cycle. Summary of the invention
  • the technical problem to be solved by the embodiments of the present invention is to provide a backlight module and a liquid crystal display device, which can firmly fix the quantum dot material in the backlight module, and can be assembled simply and quickly.
  • the first technical solution adopted by the present invention is: a circuit for adjusting an output voltage, disposed between an input voltage source and an internal component, including an output transformer, a first switching transistor, a second switching transistor, and a signal controller; wherein
  • the output transformer includes an input coil connected to the input voltage source, and a first output coil and a second output coil at the secondary; wherein the first output coil is connected in series with the second output coil, and a voltage output end of the first output coil is connected to a drain of the first switching transistor, and a voltage output end of the second output coil is connected to a drain of the second switching transistor; a first level signal output terminal connected to a gate of the first switching transistor, a second level signal output terminal connected to a gate of the second switching transistor, and an input connected to one end of the internal component End, the first output of the first component is outputted according to the start voltage of the internal component and the preset first voltage threshold and the preset second voltage threshold a level signal, and outputting a second level signal at the second level signal output end;
  • a source of the first switching transistor is connected to the other end of the internal component, and is configured to implement the internal component and the first level according to a level of a first level signal output by the first level signal output end Turning on or off between the output coils, wherein, when conducting, outputting an output voltage of the first output coil to the internal component;
  • a source of the second switching transistor is connected to the other end of the internal component, and is configured to implement the internal component and the first level according to a level of a second level signal output by the second level signal output end Turning on or off between the two output coils, wherein, when conducting, outputting a superimposed output voltage of the first output coil and the second output coil to the internal component.
  • the signal controller includes a first comparator and a second comparator; wherein the first comparator includes an input connected to one end of the internal component and the first level signal output terminal, And obtaining, by the input end, a starting voltage of the internal component, and comparing, according to the obtained starting voltage of the internal component, the preset first voltage threshold Afterwards, outputting the first level signal at the first level signal output end;
  • the second comparator includes an input connected to one end of the internal component and the second level signal output for obtaining a starting voltage of the internal component through the input, and according to the After the obtained starting voltage of the internal component is compared with the preset second voltage threshold, the second level signal is outputted at the second level signal output terminal; wherein the preset first The voltage threshold is equal to the preset second voltage threshold.
  • the signal controller drives the first switching transistor to close and drives the second switching transistor to be turned off to achieve conduction between the internal component and the first output coil, and output an output voltage of the first output coil Give the internal components.
  • the first level signal is a low level signal and the second level signal is a high level signal
  • a signal controller driving the first switching transistor to turn off and driving the second switching transistor to be closed to achieve conduction between the internal component and the second output coil, outputting the first output coil and the The superimposed output voltage of the second output coil is given to the internal component.
  • the second technical solution used in the present invention is: a circuit for adjusting an output voltage, disposed between an input voltage source and an internal component, including an output transformer, a first switching transistor, and a second a switching transistor, a third switching transistor, a logic operator, and a signal controller; wherein
  • the output transformer includes an input coil connected to the input voltage source, and a first output coil, a second output coil, and a third output coil at the secondary; wherein the third output coil is disposed at the first output Between the coil and the second output coil, and with the first output coil and The second output coils are connected in series, and the voltage output end of the first output coil is connected to the drain of the first switching transistor, and the voltage output end of the second output coil and the second switch a drain of the transistor is connected, and a voltage output end of the third output coil is connected to a drain of the third switching transistor;
  • the signal controller has a first level signal output coupled to a gate of the first switching transistor, a second level signal output coupled to a gate of the second switching transistor, and An input end connected to one end of the internal component, wherein the first voltage is compared with a preset first voltage threshold and a preset second voltage threshold according to the starting voltage of the internal component
  • the flat signal output terminal outputs a first level signal
  • the second level signal output terminal outputs a second level signal
  • the logic operator has a first end connected to the output terminal of the first level signal, a second end connected to the output terminal of the second level signal, and a gate connected to the third switching transistor a third end, or the logic operator having a first end coupled to the second level signal output, a second end coupled to the first level signal output, and the third a third end of the switching transistor connected to the third end, configured to determine, according to the level of the first level signal and the second level signal, an output to the third switching transistor through the third end a level of the three-level signal; wherein, when the first level signal and the second level signal are low level signals or high level signals, the third level signal is a high level signal When the first level signal is a low level signal and the second level signal is a high level signal, or the first level signal is a high level signal and the second level signal is When the signal is low level, the third level signal is a low level signal; a source of the switching transistor is connected to the other end of the internal component, and configured to implement the internal component and the first output
  • a source of the second switching transistor is connected to the other end of the internal component, and is configured to implement the internal component and the first level according to a level of a second level signal output by the second level signal output end Turning on or off the two output coils, wherein, when conducting, outputting a superimposed output voltage of the first output coil, the second output coil, and the third output coil to the internal component;
  • a source of the third switching transistor is connected to the other end of the internal component, and is configured to implement the internal component and the third output coil according to a level of a third level signal output by the logic operator Turning on or off, wherein, when conducting, outputting a superimposed output voltage of the first output coil and the third output coil to the internal component.
  • the signal controller includes a first comparator and a second comparator; wherein the first comparator includes an input connected to one end of the internal component and the first level signal output terminal, And obtaining, by the input end, a starting voltage of the internal component, and comparing the starting voltage of the obtained internal component with the preset first voltage threshold, at the first level signal
  • the output terminal outputs the first level signal
  • the second comparator includes an input connected to one end of the internal component and the second level signal output for obtaining a starting voltage of the internal component through the input, and according to the After the obtained starting voltage of the internal component is compared with the preset second voltage threshold, the second level signal is outputted at the second level signal output terminal; wherein the preset second The voltage threshold is greater than the preset first voltage threshold.
  • the logic operator includes a fourth switching transistor and a fifth switching transistor connected in parallel with the fourth switching transistor;
  • the drain of the fourth switching transistor is connected to the drain of the fifth switching transistor, and a gate of the third switching transistor is connected, a source of the fourth switching transistor is connected to a source of the fifth switching transistor, a gate of the fourth switching transistor and the first level signal output end Connected, the gate of the fifth switching transistor is connected to the second level signal output terminal; or the drain of the fourth switching transistor is connected to the drain of the fifth switching transistor, and a gate of the three-switch transistor is connected, a source of the fourth switching transistor is connected to a source of the fifth switching transistor, and a gate of the fourth switching transistor is connected to the output terminal of the second level signal.
  • the gate of the fifth switching transistor is connected to the first level signal output terminal.
  • the first level signal is a high level signal and the second level signal is a low level signal
  • the three-level signal is a low-level signal
  • the signal controller drives the first switching transistor to be closed, and the second switching transistor and the third switching transistor are driven to be turned off to implement the internal component and the first Conduction between an output coil outputs an output voltage of the first output coil to the internal component.
  • the first level signal and the second level signal are both when the obtained starting voltage is between the preset first voltage threshold and the preset second voltage threshold a low level signal, the third level signal is obtained as a high level signal, the signal controller driving the third switching transistor to be closed, driving the first switching transistor and the second switching transistor to be turned off, A conduction between the internal component and the third output coil is achieved, and a superimposed output voltage of the first output coil and the third output coil is output to the internal component.
  • the first level signal is a low level signal and the second level signal is a high level signal
  • the third is obtained
  • the level signal is a low level signal
  • the signal controller drives the second switching transistor to be closed, driving the first switching transistor and the third switching transistor to be turned off, implementing the internal component and the second Conducting between the output coils, outputting the first output coil, the second output coil, and the The superimposed output voltage of the third output coil is given to the internal component.
  • the first level signal is a high level a signal or a low level signal
  • the second level signal being a high level signal or a low level signal
  • the respective driving transistors connected to the respective output coils in the circuit are turned on or off to control the magnitude of the output voltage.
  • the circuit and method for adjusting the output voltage provided by the present invention have the following beneficial effects: Since each output coil in the circuit is connected to the switching transistor, the first level signal in the circuit is determined by the obtained starting voltage of the internal component. And the level of the second level signal, the signal controller drives each switching transistor to be closed or opened, thereby controlling the number of output coils to output different magnitudes of voltage, so that the voltage output mode can be changed without changing the output voltage.
  • the use requirements between different internal components enable compatibility with a wide range of output voltages, reduced design costs, and reduced design cycles.
  • FIG. 1 is a connection diagram of a circuit for adjusting an output voltage according to a first embodiment of the present invention
  • FIG. 2 is another connection diagram of a circuit for adjusting an output voltage according to a first embodiment of the present invention
  • 3 is a schematic diagram of a connection of a circuit for adjusting an output voltage according to a second embodiment of the present invention
  • 4 is another schematic connection diagram of a circuit for adjusting an output voltage according to a second embodiment of the present invention
  • FIG. 5 is still another connection diagram of a circuit for adjusting an output voltage according to a second embodiment of the present invention.
  • FIG. 6 is still another connection diagram of a circuit for adjusting an output voltage according to a second embodiment of the present invention.
  • FIG. 7 is a circuit schematic diagram of a circuit for adjusting an output voltage according to a second embodiment of the present invention.
  • FIG. 8 is a flowchart of a method for adjusting an output voltage according to a third embodiment of the present invention. . detailed description
  • FIG. 1 and FIG. 2 a connection diagram of a circuit for adjusting an output voltage according to a first embodiment of the present invention is shown.
  • the circuit 1 for adjusting the output voltage in the first embodiment of the present invention is disposed between the input voltage source 2 and the internal component 3, the circuit 1 including an output transformer, a first switching transistor, a second switching transistor, and a signal controller; among them,
  • the output transformer includes an input coil that connects the input voltage source 2 and obtains the input voltage of the input voltage source 2, and a first output coil and a second output coil that are located in the secondary, the first output coil and the second output coil are used for The input voltage is voltage-converted; wherein the first output coil is connected in series with the second output coil, and the voltage output end of the first output coil is connected to the drain D1 of the first switching transistor, and the voltage output end of the second output coil is a drain D2 of the second switching transistor is connected; the signal controller has a first level signal output terminal P1 connected to the gate G1 of the first switching transistor, and a second level signal connected to the gate G2 of the second switching transistor Output P2, and An input terminal P3 connected to one end of the internal component 3, the signal controller is configured to obtain the starting voltage of the internal component 3 through the input terminal P3, and according to the obtained starting voltage of the internal component 3 and the preset first voltage threshold and pre- After the second voltage threshold is compared, the first level signal output terminal P1 outputs
  • the source S1 of the first switching transistor is connected to the other end of the internal component 3 for conducting the conduction between the internal component 3 and the first output coil according to the level of the first level signal ml outputted by the first level signal output terminal. Or disconnected, wherein, when conducting, outputting the output voltage of the first output coil to the internal component 3;
  • the source S1 of the second switching transistor is connected to the other end of the internal component 3 for conducting the conduction between the internal component 3 and the second output coil according to the level of the second level signal m2 outputted by the second level signal output terminal. Or disconnected, wherein, when conducting, the superimposed output voltages of the first output coil and the second output coil are output to the internal component 3.
  • the signal controller includes a first comparator and a second comparator, wherein the first comparator presets a first voltage threshold, and the second comparator presets a second voltage threshold, the preset a voltage threshold equal to a preset second voltage threshold;
  • the first comparator includes an input terminal connected to one end of the internal component 3 and a first level signal output terminal P1 for obtaining a starting voltage of the internal component 3 through the input terminal, and according to the obtained internal component 3 After the startup voltage is compared with the preset first voltage threshold, the first level signal output is outputted at the first level signal output terminal P1;
  • the second comparator includes an input terminal connected to one end of the internal component and a second level signal output terminal P2 for obtaining a starting voltage of the internal component through the input terminal, and according to the obtained starting voltage of the internal component 3 After comparing with the preset second voltage threshold, at the second level The signal output terminal P2 outputs a second level signal m2.
  • the determined voltage threshold is equal, that is, the first voltage threshold is equal to the second voltage threshold, so when the obtained starting voltage is less than the preset first voltage threshold, the first power
  • the flat signal ml is a high level signal and the second level signal m2 is a low level signal.
  • the first level signal ml is a low level signal.
  • the second level signal m2 is a high level signal.
  • the signal controller drives the first switching transistor to be closed and Driving the second switching transistor to open, to achieve conduction between the internal component 3 and the first output coil, outputting the output voltage of the first output coil to the internal component 3; at the first level signal ml is a low level signal and
  • the signal controller drives the first switching transistor to open and drives the second switching transistor to close, thereby implementing internal components 3 and The conduction between the two output coils outputs the superimposed output voltage of the first output coil and the second output coil to the internal component 3.
  • a working principle of a circuit for adjusting an output voltage in the first embodiment of the present invention is:
  • the signal controller automatically monitors and acquires a starting voltage of an internal component (such as a light emitting diode), and compares the starting voltage in the signal controller. According to the comparison result, different level signals are output, so that the switching transistors connected to the respective output coils are driven to be closed or opened by the signal controller, and the voltages of different sizes are controlled to meet the requirements of different internal components.
  • the designer can also adjust the turns ratio of the input coil to the output coil without changing the voltage output mode according to the starting voltage and actual needs of different internal components.
  • the output coil includes a first output coil and a second output coil, wherein a ratio of turns of the input coil to the first output coil is 1: A, the input coil and the first and second output coils The turns ratio of the sum of the two is 1: B; when the starting voltage U0 of the internal component is lower than the first voltage threshold U1, the first switching transistor K1 connected to the first output coil is closed, and the second connecting second output coil is connected.
  • the second embodiment of the present invention further provides a circuit for adjusting the output voltage, not only having the same as described in the first embodiment of the present invention.
  • a third output coil, a third switching transistor, and a logic operator are also added to the circuit configuration and connection relationship of the output voltage.
  • FIG. 6 are schematic diagrams showing the connection of a circuit for adjusting an output voltage according to a second embodiment of the present invention.
  • the circuit 1 for adjusting the output voltage in the second embodiment of the present invention is disposed between the input voltage source 2 and the internal component 3.
  • the circuit 1 includes an output transformer, a first switching transistor, a second switching transistor, and a third switching transistor.
  • the output transformer includes an input coil that connects the input voltage source 2 and obtains an input voltage of the input voltage source 2, and a first output coil, a second output coil, and a third output that are located at the secondary a coil, the first output coil, the second output coil, and the third output coil are both used for voltage conversion of the input voltage; wherein the third output coil is disposed between the first output coil and the second output coil, and the first output The coil and the second output coil are connected in series, and the voltage output end of the first output coil is first The drain D1 of the switching transistor is connected, the voltage output end of the second output coil is connected to the drain D2 of the second switching transistor, and the voltage output end of the third output coil is connected to the drain D3 of the third switching transistor;
  • the signal controller has a first level signal output terminal P1 connected to the gate G1 of the first switching transistor, a second level signal output terminal P2 connected to the gate G2 of the second switching transistor, and the internal component 3
  • An input terminal P3 connected at one end, the signal controller is configured to obtain the starting voltage of the internal component 3 through the input terminal P3, and according to the obtained starting voltage of the internal component 3 and the preset first voltage threshold and the preset second voltage After the threshold is compared, the first level signal ml is outputted at the first level signal output terminal P1, and the second level signal m2 is outputted at the second level signal output terminal P2; wherein the preset second The voltage threshold is greater than the preset first voltage threshold;
  • the first end L1 of the logic operator is connected to the first level signal output terminal P1, the second end L2 is connected to the second level signal output terminal P2, and the third end L3 is connected to the gate G3 of the third switching transistor, or The first end L1 of the logic operator is connected to the second level signal output terminal P2, the second end L2 is connected to the first level signal output terminal P1, and the third end L3 is connected to the gate G3 of the third switching transistor;
  • the logic operator is configured to determine the level of the third level signal m3 outputted to the third switching transistor through the third terminal L3 according to the level of the first level signal ml and the second level signal m2; wherein, when the first level is When the flat signal ml and the second level signal m2 are low level signals or high level signals, the third level signal m3 is a high level signal; when the first level signal ml is a low level signal and the second When the level signal m2 is a high level signal, or the first level signal ml is a high level
  • the source S1 of the first switching transistor is connected to the other end of the internal component 3 for conducting the internal component 3 and the first output coil according to the level of the first level signal ml outputted by the first level signal output terminal or Disconnecting, wherein, when conducting, outputting the output voltage of the first output coil to the internal Element 3;
  • the source S1 of the second switching transistor is connected to the other end of the internal component 3 for conducting the internal component 3 and the second output coil according to the level of the second level signal m2 outputted by the second level signal output terminal or Disconnecting, wherein, when conducting, outputting a superimposed output voltage of the first output coil, the second output coil and the third output coil to the internal component 3;
  • the source S3 of the third switching transistor is connected to one end of the internal component 3 for turning on or off the internal component 3 and the third output coil according to the level of the third level signal m3, and outputting the first output coil And the superimposed output voltage of the third output coil is given to the internal component 3.
  • the output coils are three groups for widening the range of the output voltage, and the preset second voltage threshold in the signal controller should be greater than the preset first voltage threshold, so that the starting voltage of the internal components can be expanded. Compare the range to expand the range of use of different internal components.
  • the first level signal ml is a high level signal and the second level signal m2 is a low level signal, and the third level signal m3 is obtained as a low level.
  • a flat signal when the obtained starting voltage is between the preset first voltage threshold and the preset second voltage threshold, the first level signal ml and the second level signal m2 are low level signals, Obtaining a third level signal m3 as a high level signal; when the obtained starting voltage is greater than a preset second voltage threshold, the first level signal ml is a low level signal and the second level signal m2 is a high level The signal is flat, and the third level signal m3 is obtained as a low level signal.
  • the signal controller includes a first comparator and a second comparator, wherein the first comparator presets a first voltage threshold, and the second comparator presets a second voltage threshold; wherein
  • the first comparator comprises an input connected to one end of the internal component 3 and a first level signal output P1 for obtaining the starting voltage of the internal component 3 through the input, and according to the obtained internal component 3
  • the starting voltage is compared with the preset first voltage threshold, and the first voltage is
  • the flat signal output terminal PI outputs a first level signal ml;
  • the second comparator comprises an input connected to one end of the internal component and a second level signal output P2 for obtaining the starting voltage of the internal component 3 through the input and according to the obtained activation of the internal component 3 After the voltage is compared with the preset second voltage threshold, the second level signal m2 is outputted at the second level signal output terminal P2.
  • the logic operator includes a fourth switching transistor and a fifth switching transistor connected in parallel with the fourth switching transistor;
  • the drain D4 of the fourth switching transistor is connected to the drain D5 of the fifth switching transistor, and is also connected to the gate G3 of the third switching transistor, and the source S4 of the fourth switching transistor is connected to the source S5 of the fifth switching transistor.
  • the gate G4 of the fourth switching transistor is connected to the first level signal output terminal P1, and the gate G5 of the fifth switching transistor is connected to the second level signal output terminal P2; or
  • the drain D4 of the fourth switching transistor is connected to the drain D5 of the fifth switching transistor, and is also connected to the gate G3 of the third switching transistor, and the source S4 of the fourth switching transistor is connected to the source S5 of the fifth switching transistor.
  • the gate G4 of the fourth switching transistor is connected to the second level signal output terminal P2, and the gate G5 of the fifth switching transistor is connected to the first level signal output terminal P1.
  • the signal controller drives the first switching transistor to be closed, drives the second switching transistor and the third switching transistor to be turned off, realizes conduction between the internal component 3 and the first output coil, and outputs an output voltage of the first output coil to the internal Element 3.
  • the first level signal ml and the second level signal m2 are both low level signals, and the third power is obtained.
  • the flat signal m3 is a high level signal, and the signal controller drives the third switching transistor to be closed, driving the first The switching transistor and the second switching transistor are turned off to achieve conduction between the internal component 3 and the third output coil, and the superimposed output voltages of the first output coil and the third output coil are output to the internal component 3.
  • the signal controller drives the second switching transistor to be closed, drives the first switching transistor and the third switching transistor to be turned off, and realizes conduction between the internal component 3 and the second output coil, and outputs the first output coil and the second output coil. And the superimposed output voltage of the third output coil to the internal component 3.
  • circuit for adjusting the output voltage in the second embodiment of the present invention is the same as that of the circuit for adjusting the output voltage in the first embodiment of the present invention, and will not be described herein.
  • the output coil includes a first output coil, a second output coil, and a third output coil, the third output coil being located between the first output coil and the second output coil, wherein the input coil and the first output coil are The ratio is 1: A, the turns ratio of the sum of the input coil and the first and third output coils is 1: B, the number of turns of the sum of the input coil and the first, second and third output coils Ratio is 1: C;
  • the first switching transistor K1 connected to the first output coil is closed, the second switching transistor K2 connecting the second output coil, and the third switch connected to the third output coil
  • the turns ratio of the input coil to the first output coil is achieved;
  • the first switching transistor K1 connected to the first output coil is disconnected and the second output coil is connected.
  • the first switching transistor K1 connected to the first output coil is disconnected and connected to the third output coil.
  • the third switching transistor K3 is turned off, and the second switching transistor K2 connected to the second output coil is closed, so that the output coil is used in three groups, that is, the first output coil, the third output coil, and the second output coil, which are at the second output.
  • FIG. 7 a circuit schematic diagram of a circuit for adjusting an output voltage according to a second embodiment of the present invention
  • the circuit in the block is a circuit for adjusting an output voltage
  • the circuit obtains an input of an input voltage source.
  • the voltage Vin is outputted to the internal component LED after being transformed by the output. among them,
  • the output transformer includes an input coil N1, and a first output coil N2, a second output coil N4, and a third output coil N3 at the secondary, a first output coil N2, a second output coil N4, and a third output coil N3.
  • the signal controller includes a first comparator OP2 and a second comparator OP1, both of which obtain the starting voltage FB of the internal component LED, which is compared with the Vref2 for the first voltage threshold in the first comparator OP2.
  • the level signal OutPut2 is a first level signal, and after being compared with Vref1 for the second voltage threshold in the second comparator OP1, the output level signal OutPutl is a second level signal;
  • the logic operator includes a fourth switching transistor Q17 and a fifth switching transistor Q18, which are connected in parallel and respectively obtain different level signals, and output a third level signal to the third switching transistor Q13; the first switching transistor Q2 is connected to the first Between the output coil N2 and the internal component LED, an OutPut2 is obtained as a first level signal, and when turned on, an output voltage of the first output coil N2 is output to the internal component LED;
  • the second switching transistor Q1 is connected between the second output coil N4 and the internal component LED to obtain OutPutl which is a second level signal, and when turned on, outputs the first output coil N2, the second output coil N4 and the third output coil N3.
  • OutPutl which is a second level signal, and when turned on, outputs the first output coil N2, the second output coil N4 and the third output coil N3.
  • the superimposed output voltage of the three is given to the internal component LED;
  • the third switching transistor Q13 is connected between the third output coil N3 and the internal component LED, and when turned on, outputs the superimposed output voltage of the first output coil N2 and the third output coil N3 to the internal component LED.
  • a method for adjusting an output voltage in a third embodiment of the present invention which is implemented in a circuit for adjusting an output voltage in a first embodiment of the present invention or a second embodiment of the present invention, the method comprising:
  • Step S101 obtaining a starting voltage of the internal component, and determining, according to the obtained starting voltage of the internal component, a first level signal and a second level signal in the circuit; wherein, the first level signal is a high level signal or a low level signal, the second level signal being a high level signal or a low level signal;
  • Step S102 driving each of the switching transistors connected to the output coils in the circuit to be turned on or off according to the determined first level signal and the second level signal, thereby controlling the magnitude of the output voltage.
  • the circuit and method for adjusting the output voltage provided by the present invention have the following beneficial effects: Since each output coil in the circuit is connected to the switching transistor, the first level signal in the circuit is determined by the obtained starting voltage of the internal component. And the level of the second level signal, the signal controller drives each switching transistor to be closed or opened, thereby controlling the number of output coils to output different magnitudes of voltage, so that the voltage output mode can be changed without changing the output voltage.
  • the use requirements between different internal components enable compatibility with a wide range of output voltages, reduced design costs, and reduced design cycles.

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Abstract

一种用于调整输出电压的电路,设置于输入电压源和内部元件之间,包括输出变压器、信号控制器、第一及第二开关晶体管;其中,输出变压器包括输入线圈、及相串联的第一、第二输出线圈,第一开关晶体管连接第一输出线圈与内部元件,第二开关晶体管连接第二输出线圈与内部元件,信号控制器连接内部元件,还分别连接第一及第二开关晶体管。信号控制器自动监测并获取内部元件的启动电压并进行比较,根据比较结果输出不同的电平信号,驱动与第一、第二输出线圈相连的开关晶体管闭合或断开,控制不同大小的电压输出。无需更改电压输出模式,满足电压差较大的不同内部元件的使用,实现兼容宽范围的输出电压、降低设计成本和周期的目的。

Description

一种用于调整输出电压的电路及方法
本申请要求于 2014 年 6 月 9 日提交中国专利局、 申请号为 201410250230. 3 , 发明名称为 "一种用于调整输出电压的电路及方法" 的中 国专利申请的优先权, 上述专利的全部内容通过引用结合在本申请中。 技术领域
本发明涉及电子技术领域,尤其涉及一种用于调整输出电压的电路及方 法。 背景技术
由于电子设备如电视机、 显示器、 音响及电脑等的内部元件所使用的直 流电压不尽相同, 因此, 在电子设备中, 通常将输入的直流电压转换成不同 的输出电压以供电子设备中不同的内部元件使用。 目前,往往釆用固定的电压输出模式将输入的直流电压转换成输出电压 用来满足电子设备内部指定元件的使用, 其缺点在于: 当输出电压所连接的 内部元件发生改变, 当前内部元件与前一内部元件之间所需输出电压相差较 大时, 使得该电压输出模式无法满足当前内部元件的使用要求, 需要重新设 计电压输出转变模式, 从而增加了设计成本和设计周期。 发明内容
本发明实施例所要解决的技术问题在于,提供一种背光模组及液晶显示 装置, 能够将量子点材料牢固的固定在背光模组中, 并且能够简单快速的组 装。 为了解决上述技术问题, 本发明釆用的第一种技术方案为: 一种用于调 整输出电压的电路, 设置于输入电压源和内部元件之间, 包括输出变压器、 第一开关晶体管、 第二开关晶体管以及信号控制器; 其中,
所述输出变压器包括连接所述输入电压源的输入线圈, 以及位于次级的 第一输出线圈和第二输出线圈; 其中, 所述第一输出线圈与所述第二输出线 圈相串联,且所述第一输出线圈的电压输出端与所述第一开关晶体管的漏极 相连, 所述第二输出线圈的电压输出端与所述第二开关晶体管的漏极相连; 所述信号控制器包括与所述第一开关晶体管的栅极相连的第一电平信 号输出端, 与所述第二开关晶体管的栅极相连的第二电平信号输出端, 以及 与所述内部元件的一端相连的输入端,其用于才艮据所述内部元件的启动电压 与预设的第一电压阔值及预设的第二电压阔值进行比较后,在所述第一电平 信号输出端输出第一电平信号, 以及在所述第二电平信号输出端输出第二电 平信号;
所述第一开关晶体管的源极与所述内部元件的另一端相连,用于根据所 述第一电平信号输出端输出的第一电平信号的高低, 实现所述内部元件与所 述第一输出线圈之间的导通或断开, 其中, 在导通时, 输出所述第一输出线 圈的输出电压给所述内部元件;
所述第二开关晶体管的源极与所述内部元件的另一端相连,用于根据所 述第二电平信号输出端输出的第二电平信号的高低, 实现所述内部元件与所 述第二输出线圈之间的导通或断开, 其中, 在导通时, 输出所述第一输出线 圈与所述第二输出线圈的叠加输出电压给所述内部元件。
其中, 所述信号控制器包括第一比较器和第二比较器; 其中, 所述第一比较器包括与所述内部元件的一端相连的输入端和所述第一 电平信号输出端, 其用于通过所述输入端获得所述内部元件的启动电压, 并 根据所述获得的内部元件的启动电压与所述预设的第一电压阔值进行比较 后, 在所述第一电平信号输出端输出所述第一电平信号;
所述第二比较器包括与所述内部元件的一端相连的输入端和所述第二 电平信号输出端, 其用于通过所述输入端获得所述内部元件的启动电压, 并 根据所述获得的内部元件的启动电压与所述预设的第二电压阔值进行比较 后, 在所述第二电平信号输出端输出所述第二电平信号; 其中, 所述预设的 第一电压阔值与所述预设的第二电压阔值相等。
其中, 当所述获得的启动电压小于所述预设的第一电压阔值时, 所述第 一电平信号为高电平信号且所述第二电平信号为低电平信号, 所述信号控制 器驱动所述第一开关晶体管闭合及驱动所述第二开关晶体管断开, 实现所述 内部元件与所述第一输出线圈之间的导通,输出所述第一输出线圈的输出电 压给所述内部元件。
其中, 当所述获得的启动电压大于所述预设的第一电压阔值时, 所述第 一电平信号为低电平信号且所述第二电平信号为高电平信号, 所述信号控制 器驱动所述第一开关晶体管断开及驱动所述第二开关晶体管闭合, 实现所述 内部元件与所述第二输出线圈之间的导通,输出所述第一输出线圈与所述第 二输出线圈的叠加输出电压给所述内部元件。
为了解决上述技术问题, 本发明釆用的第二种技术方案为: 一种用于调 整输出电压的电路, 设置于输入电压源和内部元件之间, 包括输出变压器、 第一开关晶体管、 第二开关晶体管、 第三开关晶体管、 逻辑运算器以及信号 控制器; 其中,
所述输出变压器包括连接所述输入电压源的输入线圈, 以及位于次级的 第一输出线圈、 第二输出线圈和第三输出线圈; 其中, 所述第三输出线圈设 置于所述第一输出线圈与所述第二输出线圈之间, 并与所述第一输出线圈及 所述第二输出线圈三者相串联,且所述第一输出线圈的电压输出端与所述第 一开关晶体管的漏极相连, 所述第二输出线圈的电压输出端与所述第二开关 晶体管的漏极相连, 所述第三输出线圈的电压输出端与所述第三开关晶体管 的漏极相连;
所述信号控制器具有与所述第一开关晶体管的栅极相连的第一电平信 号输出端, 与所述第二开关晶体管的栅极相连的第二电平信号输出端, 以及 与所述内部元件的一端相连的输入端,其用于才艮据所述内部元件的启动电压 与预设的第一电压阔值及预设的第二电压阔值进行比较后,在所述第一电平 信号输出端输出第一电平信号, 以及在所述第二电平信号输出端输出第二电 平信号;
所述逻辑运算器具有与所述第一电平信号输出端相连的第一端, 与所述 第二电平信号输出端相连的第二端, 以及与所述第三开关晶体管的栅极相连 的第三端, 或所述逻辑运算器具有与所述第二电平信号输出端相连的第一 端, 与所述第一电平信号输出端相连的第二端, 以及与所述第三开关晶体管 的栅极相连的第三端, 其用于根据所述第一电平信号及所述第二电平信号的 高低,确定通过所述第三端输出给所述第三开关晶体管的第三电平信号的高 低; 其中, 当所述第一电平信号且所述第二电平信号均为低电平信号或高电 平信号时, 所述第三电平信号为高电平信号; 当所述第一电平信号为低电平 信号且所述第二电平信号为高电平信号,或所述第一电平信号为高电平信号 且所述第二电平信号为低电平信号时, 所述第三电平信号为低电平信号; 所述第一开关晶体管的源极与所述内部元件的另一端相连,用于根据所 述第一电平信号输出端输出的第一电平信号的高低, 实现所述内部元件与所 述第一输出线圈的导通或断开, 其中, 在在导通时, 输出所述第一输出线圈 的输出电压给所述内部元件;
所述第二开关晶体管的源极与所述内部元件的另一端相连,用于根据所 述第二电平信号输出端输出的第二电平信号的高低, 实现所述内部元件与所 述第二输出线圈的导通或断开, 其中, 在导通时, 输出所述第一输出线圈、 所述第二输出线圈及所述第三输出线圈三者的叠加输出电压给所述内部元 件;
所述第三开关晶体管的源极与所述内部元件的另一端相连,用于根据所 述逻辑运算器输出的第三电平信号的高低, 实现所述内部元件与所述第三输 出线圈的导通或断开, 其中, 在导通时, 输出所述第一输出线圈及所述第三 输出线圈的叠加输出电压给所述内部元件。
其中, 所述信号控制器包括第一比较器和第二比较器; 其中, 所述第一比较器包括与所述内部元件的一端相连的输入端和所述第一 电平信号输出端, 其用于通过所述输入端获得所述内部元件的启动电压, 并 根据所述获得的内部元件的启动电压与所述预设的第一电压阔值进行比较 后, 在所述第一电平信号输出端输出所述第一电平信号;
所述第二比较器包括与所述内部元件的一端相连的输入端和所述第二 电平信号输出端, 其用于通过所述输入端获得所述内部元件的启动电压, 并 根据所述获得的内部元件的启动电压与所述预设的第二电压阔值进行比较 后, 在所述第二电平信号输出端输出所述第二电平信号; 其中, 所述预设的 第二电压阔值大于所述预设的第一电压阔值。
其中, 所述逻辑运算器包括第四开关晶体管和与所述第四开关晶体管相 并联的第五开关晶体管; 其中,
所述第四开关晶体管的漏极与所述第五开关晶体管的漏极相连,还与所 述第三开关晶体管的栅极相连, 所述第四开关晶体管的源极与所述第五开关 晶体管的源极相连, 所述第四开关晶体管的栅极与所述第一电平信号输出端 相连, 所述第五开关晶体管的栅极与所述第二电平信号输出端相连; 或 所述第四开关晶体管的漏极与所述第五开关晶体管的漏极相连,还与所 述第三开关晶体管的栅极相连, 所述第四开关晶体管的源极与所述第五开关 晶体管的源极相连, 所述第四开关晶体管的栅极与所述第二电平信号输出端 相连, 所述第五开关晶体管的栅极与所述第一电平信号输出端相连。
其中, 当获得的启动电压小于所述预设的第一电压阔值时, 所述第一电 平信号为高电平信号且所述第二电平信号为低电平信号,得到所述第三电平 信号为低电平信号, 所述信号控制器驱动所述第一开关晶体管闭合, 驱动所 述第二开关晶体管及所述第三开关晶体管断开, 实现所述内部元件与所述第 一输出线圈之间的导通, 输出所述第一输出线圈的输出电压给所述内部元 件。
其中, 当获得的启动电压位于所述预设的第一电压阔值和所述预设的第 二电压阔值之间时, 所述第一电平信号且所述第二电平信号均为低电平信 号, 得到所述第三电平信号为高电平信号, 所述信号控制器驱动所述第三开 关晶体管闭合, 驱动所述第一开关晶体管及所述第二开关晶体管断开, 实现 所述内部元件与所述第三输出线圈之间的导通,输出所述第一输出线圈和所 述第三输出线圈的叠加输出电压给所述内部元件。
其中, 当获得的启动电压大于所述预设的第二电压阈值时, 所述第一电 平信号为低电平信号且所述第二电平信号为高电平信号,得到所述第三电平 信号为低电平信号, 所述信号控制器驱动所述第二开关晶体管闭合, 驱动所 述第一开关晶体管及所述第三开关晶体管断开, 实现所述内部元件与所述第 二输出线圈之间的导通, 输出所述第一输出线圈、 所述第二输出线圈及所述 第三输出线圈三者的叠加输出电压给所述内部元件。 为了解决上述技术问题, 本发明釆用的第三种技术方案为: 一种用于调 整输出电压的方法, 所述方法包括:
获得内部元件的启动电压, 并根据所述获得的内部元件的启动电压, 确 定所述电路中的第一电平信号及第二电平信号; 其中, 所述第一电平信号为 高电平信号或低电平信号, 所述第二电平信号为高电平信号或低电平信号; 根据所述确定的第一电平信号及第二电平信号,通过所述电路中的信号 控制器驱动所述电路中与各输出线圈相连的各开关晶体管闭合或断开,从而 控制输出电压的大小。
本发明所提供的用于调整输出电压的电路和方法, 具有如下有益效果: 由于电路中的各输出线圈均与开关晶体管相连,通过获得的内部元件的 启动电压确定电路中的第一电平信号及第二电平信号的高低,信号控制器驱 动各开关晶体管闭合或断开, 从而控制输出线圈的组数输出不同大小的电 压, 因此无需更改电压输出模式, 就能满足输出电压相差较大的不同内部元 件之间的使用要求, 实现兼容宽范围的输出电压、 降低设计成本和缩短设计 周期的目的。
附图说明
图 1为本发明第一实施例提供的用于调整输出电压的电路的一连接示意 图;
图 2为本发明第一实施例提供的用于调整输出电压的电路的又一连接示 意图;
图 3为本发明第二实施例提供的用于调整输出电压的电路的一连接示意 图; 图 4为本发明第二实施例提供的用于调整输出电压的电路的又一连接示 意图;
图 5为本发明第二实施例提供的用于调整输出电压的电路的又一连接示 意图;
图 6为本发明第二实施例提供的用于调整输出电压的电路的又一连接示 意图;
图 7为本发明第二实施例提供的用于调整输出电压的电路的一电路原理 图;
图 8为本发明第三实施例提供的用于调整输出电压的方法的流程图。 。 具体实施方式
下面参考附图对本发明的优选实施例进行描述。
结合参见图 1和图 7 , 为本发明用于调整输出电压的电路的实施例。 如图 1和图 2所示, 为本发明第一实施例提供的用于调整输出电压的电 路的连接示意图。 本发明第一实施例中用于调整输出电压的电路 1 , 设置于 输入电压源 2和内部元件 3之间, 该电路 1包括输出变压器、 第一开关晶体 管、 第二开关晶体管以及信号控制器; 其中,
输出变压器包括连接输入电压源 2并获得该输入电压源 2输入电压的输 入线圈, 以及位于次级的第一输出线圈和第二输出线圈, 该第一输出线圈及 第二输出线圈均用于将输入电压进行电压转换的; 其中, 第一输出线圈与第 二输出线圈相串联,且第一输出线圈的电压输出端与第一开关晶体管的漏极 D1相连, 第二输出线圈的电压输出端与第二开关晶体管的漏极 D2相连; 信号控制器具有与第一开关晶体管的栅极 G1相连的第一电平信号输出 端 P1 , 与第二开关晶体管的栅极 G2相连的第二电平信号输出端 P2, 以及 与内部元件 3的一端相连的输入端 P3 , 该信号控制器用于通过输入端 P3获 得内部元件 3的启动电压, 并根据获得的内部元件 3的启动电压与预设的第 一电压阔值及预设的第二电压阔值进行比较后, 在第一电平信号输出端 P1 输出第一电平信号 ml , 以及在第二电平信号输出端 P2 输出第二电平信号 m2;
第一开关晶体管的源极 SI与内部元件 3的另一端相连, 用于根据第一 电平信号输出端输出的第一电平信号 ml的高低, 实现内部元件 3与第一输 出线圈的导通或断开, 其中, 在导通时, 输出第一输出线圈的输出电压给内 部元件 3;
第二开关晶体管的源极 S1与内部元件 3的另一端相连, 用于根据第二 电平信号输出端输出的第二电平信号 m2的高低, 实现内部元件 3与第二输 出线圈的导通或断开, 其中, 在导通时, 输出第一输出线圈及第二输出线圈 的叠加输出电压给内部元件 3。
更进一步的, 信号控制器包括第一比较器和第二比较器, 该第一比较器 中预设第一电压阔值, 该第二比较器中预设第二电压阔值, 预设的第一电压 阔值与预设的第二电压阔值相等; 其中,
第一比较器包括与内部元件 3的一端相连的输入端和与第一电平信号输 出端 P1 , 该第一比较器用于通过输入端获得内部元件 3 的启动电压, 并根 据获得的内部元件 3的启动电压与预设的第一电压阔值进行比较后,在第一 电平信号输出端 P1输出第一电平信号 ml ;
第二比较器包括与内部元件的一端相连的输入端和第二电平信号输出 端 P2, 该第二比较器用于通过输入端获得内部元件的启动电压, 并根据获 得的内部元件 3的启动电压与预设的第二电压阔值进行比较后,在第二电平 信号输出端 P2输出第二电平信号 m2。
此时, 由于输出线圈为两组, 判别的电压阔值相等, 即第一电压阔值等 于第二电压阔值, 因此当获得的启动电压小于预设的第一电压阔值时, 第一 电平信号 ml为高电平信号且第二电平信号 m2为低电平信号, 当获得的启 动电压大于或等于预设的第一电压阔值时, 第一电平信号 ml为低电平信号 且第二电平信号 m2为高电平信号。
在第一电平信号 ml为高电平信号且第二电平信号 m2为低电平信号时 (即启动电压小于预设的第一电压阔值), 信号控制器驱动第一开关晶体管 闭合及驱动第二开关晶体管断开, 实现内部元件 3与第一输出线圈之间的导 通, 输出第一输出线圈的输出电压给内部元件 3 ; 在第一电平信号 ml为低 电平信号且第二电平信号 m2为高电平信号时(即启动电压大于预设的第一 电压阔值), 信号控制器驱动第一开关晶体管断开及驱动第二开关晶体管闭 合, 实现内部元件 3与第二输出线圈之间的导通, 输出第一输出线圈和第二 输出线圈的叠加输出电压给内部元件 3。
本发明第一实施例中一种用于调整输出电压的电路的工作原理为: 信号 控制器自动监测并获取内部元件(如发光二极管)的启动电压, 将启动电压 在信号控制器中进行比较后, 根据比较结果输出不同的电平信号, 从而通过 信号控制器驱动与各输出线圈相连的开关晶体管闭合或断开,控制输出不同 大小的电压, 满足不同内部元件的使用要求。 换句话说, 设计人员相应的也 可以根据不同内部元件的启动电压及实际需要,在无需改变电压输出模式的 情况下, 调整输入线圈与输出线圈的匝数比值。
作为一个例子, 输出线圈包括第一输出线圈和第二输出线圈, 其中, 输 入线圈与第一输出线圈的匝数比为 1 : A, 输入线圈与第一、 第二输出线圈 二者之和的匝数比为 1 : B;当内部元件的启动电压 U0<第一电压阔值 Ul时, 连接第一输出线圈的第一开关晶体管 K1闭合, 连接第二输出线圈的第二开 关晶体管 K2断开, 使得输出线圈釆用第一输出线圈, 其在第一输出线圈上 的输出电压 Vo=A*输入电压 Vi> U0,为了满足输出电压 Vo=内部元件的启动 电压 U0, 可以调整输入线圈与第一输出线圈的匝数比实现; 同理, 当内部 元件的启动电压 U0>第一电压阔值 U1时, 连接第一输出线圈的第一开关晶 体管 K1断开, 连接第二输出线圈的第二开关晶体管 K2闭合, 使得输出线 圈釆用两组, 即第一输出线圈和第二输出线圈, 其在第二输出线圈上的输出 电压 Vo=B*输入电压 Vi> U0, 为了满足输出电压 Vo=内部元件的启动电压 U0, 可以调整输入线圈与第一、 第二输出线圈的匝数比实现。
相应于本发明第一实施例的用于调整输出电压的电路, 本发明第二实施 例还提供一种用于调整输出电压的电路, 不仅仅具有本发明第一实施例中所 述的用于调整输出电压的电路的构成及连接关系, 还新增了第三输出线圈、 第三开关晶体管以及逻辑运算器。
如图 3至图 6所示, 为本发明第二实施例提供的用于调整输出电压的电 路的连接示意图。 本发明第二实施例中用于调整输出电压的电路 1 , 设置于 输入电压源 2和内部元件 3之间, 该电路 1包括输出变压器、 第一开关晶体 管、 第二开关晶体管、 第三开关晶体管、逻辑运算器以及信号控制器; 其中, 输出变压器包括连接输入电压源 2并获得该输入电压源 2输入电压的输 入线圈, 以及位于次级的第一输出线圈、 第二输出线圈和第三输出线圈, 第 一输出线圈、 第二输出线圈和第三输出线圈均用于将输入电压进行电压转 换; 其中, 第三输出线圈设置于第一输出线圈与第二输出线圈之间, 与第一 输出线圈及第二输出线圈三者相串联,且第一输出线圈的电压输出端与第一 开关晶体管的漏极 Dl相连, 第二输出线圈的电压输出端与第二开关晶体管 的漏极 D2相连, 第三输出线圈的电压输出端与第三开关晶体管的漏极 D3 相连;
信号控制器具有与第一开关晶体管的栅极 G1相连的第一电平信号输出 端 P1 , 与第二开关晶体管的栅极 G2相连的第二电平信号输出端 P2, 以及 与内部元件 3的一端相连的输入端 P3 , 该信号控制器用于通过输入端 P3获 得内部元件 3的启动电压, 并根据获得的内部元件 3的启动电压与预设的第 一电压阔值及预设的第二电压阔值进行比较后, 在第一电平信号输出端 P1 输出第一电平信号 ml , 以及在第二电平信号输出端 P2 输出第二电平信号 m2; 其中, 所述预设的第二电压阔值大于所述预设的第一电压阔值;
逻辑运算器的第一端 L1与第一电平信号输出端 P1相连, 第二端 L2与 第二电平信号输出端 P2相连,第三端 L3与第三开关晶体管的栅极 G3相连, 或该逻辑运算器的第一端 L1与第二电平信号输出端 P2相连, 第二端 L2与 第一电平信号输出端 P1相连,第三端 L3与第三开关晶体管的栅极 G3相连; 该逻辑运算器用于根据第一电平信号 ml及第二电平信号 m2的高低, 确定通过第三端 L3输出给第三开关晶体管的第三电平信号 m3的高低; 其 中, 当第一电平信号 ml且第二电平信号 m2均为低电平信号或高电平信号 时, 第三电平信号 m3为高电平信号; 当第一电平信号 ml为低电平信号且 第二电平信号 m2为高电平信号, 或第一电平信号 ml为高电平信号且第二 电平信号 m2为低电平信号时, 第三电平信号 m3为低电平信号;
第一开关晶体管的源极 S1与内部元件 3的另一端相连, 用于根据第一 电平信号输出端输出的第一电平信号 ml的高低, 实现内部元件 3与第一输 出线圈导通或断开, 其中, 在导通时, 输出第一输出线圈的输出电压给内部 元件 3;
第二开关晶体管的源极 SI与内部元件 3的另一端相连, 用于根据第二 电平信号输出端输出的第二电平信号 m2的高低, 实现内部元件 3与第二输 出线圈导通或断开, 其中, 在导通时, 输出第一输出线圈、 第二输出线圈及 第三输出线圈三者的叠加输出电压给内部元件 3;
第三开关晶体管的源极 S3与内部元件 3的一端相连, 用于根据第三电 平信号 m3的高低, 实现内部元件 3与第三输出线圈导通或断开, 输出所述 第一输出线圈及第三输出线圈的叠加输出电压给内部元件 3。
此时, 输出线圈为三组, 用于拓宽输出电压的范围, 在信号控制器中的 预设的第二电压阔值应大于预设的第一电压阈值,这样就可以扩大内部元件 的启动电压比较范围, 从而扩大不同内部元件的使用范围。 当获得的启动电 压小于预设的第一电压阔值时, 第一电平信号 ml为高电平信号及第二电平 信号 m2为低电平信号, 得到第三电平信号 m3为低电平信号; 当获得的启 动电压位于预设的第一电压阔值和预设的第二电压阔值之间时, 第一电平信 号 ml及第二电平信号 m2均为低电平信号, 得到第三电平信号 m3为高电 平信号; 当获得的启动电压大于预设的第二电压阔值时, 第一电平信号 ml 为低电平信号及第二电平信号 m2为高电平信号, 得到第三电平信号 m3为 低电平信号。
更进一步的, 信号控制器包括第一比较器和第二比较器, 该第一比较器 中预设第一电压阔值, 该第二比较器中预设第二电压阔值; 其中,
第一比较器包括与内部元件 3的一端相连的输入端和第一电平信号输出 端 P1 , 该第一比较器用于通过输入端获得内部元件 3 的启动电压, 并根据 获得的内部元件 3的启动电压与预设的第一电压阔值进行比较后,在第一电 平信号输出端 PI输出第一电平信号 ml ;
第二比较器包括与内部元件的一端相连的输入端和第二电平信号输出 端 P2, 该第二比较器用于通过输入端获得内部元件 3 的启动电压, 并根据 获得的内部元件 3的启动电压与预设的第二电压阔值进行比较后,在第二电 平信号输出端 P2输出第二电平信号 m2。
更进一步的, 所逻辑运算器包括第四开关晶体管和与第四开关晶体管相 并联的第五开关晶体管; 其中,
第四开关晶体管的漏极 D4与第五开关晶体管的漏极 D5相连, 还与第 三开关晶体管的栅极 G3相连,第四开关晶体管的源极 S4与第五开关晶体管 的源极 S5相连,第四开关晶体管的栅极 G4与第一电平信号输出端 P1相连, 第五开关晶体管的栅极 G5与第二电平信号输出端 P2相连; 或
第四开关晶体管的漏极 D4与第五开关晶体管的漏极 D5相连, 还与第 三开关晶体管的栅极 G3相连,第四开关晶体管的源极 S4与第五开关晶体管 的源极 S5相连,第四开关晶体管的栅极 G4与第二电平信号输出端 P2相连, 第五开关晶体管的栅极 G5与第一电平信号输出端 P1相连。
当获得的启动电压小于预设的第一电压阈值时, 第一电平信号 ml为高 电平信号及第二电平信号 m2为低电平信号, 得到第三电平信号 m3为低电 平信号, 信号控制器驱动第一开关晶体管闭合, 驱动第二开关晶体管及第三 开关晶体管断开, 实现内部元件 3与第一输出线圈之间的导通, 输出第一输 出线圈的输出电压给内部元件 3。
当获得的启动电压位于预设的第一电压阈值和预设的第二电压阔值之 间时, 第一电平信号 ml及第二电平信号 m2均为低电平信号, 得到第三电 平信号 m3为高电平信号, 信号控制器驱动第三开关晶体管闭合, 驱动第一 开关晶体管及第二开关晶体管断开, 实现内部元件 3与第三输出线圈之间的 导通, 输出第一输出线圈及第三输出线圈的叠加输出电压给内部元件 3。
当获得的启动电压大于预设的第二电压阈值时, 第一电平信号 ml为低 电平信号及第二电平信号 m2为高电平信号, 得到第三电平信号 m3为低电 平信号, 信号控制器驱动第二开关晶体管闭合, 驱动第一开关晶体管及第三 开关晶体管断开, 实现内部元件 3与第二输出线圈之间的导通, 输出第一输 出线圈、 第二输出线圈及第三输出线圈三者的叠加输出电压给内部元件 3。
本发明第二实施例中一种用于调整输出电压的电路的工作原理与本发 明第一实施例中所述的用于调整输出电压的电路的工作原理相同,在此不再 赘述。
作为一个例子, 输出线圈包括第一输出线圈、 第二输出线圈和第三输出 线圈, 第三输出线圈位于第一输出线圈和第二输出线圈之间, 其中, 输入线 圈与第一输出线圈的匝数比为 1 : A, 输入线圈与第一、 第三输出线圈二者 之和的匝数比为 1 : B, 输入线圈与第一、 第二及第三输出线圈三者之和的 匝数比为 1 : C;
当内部元件的启动电压 U0<第一电压阔值 U1时, 连接第一输出线圈的 第一开关晶体管 K1 闭合, 连接第二输出线圈的第二开关晶体管 K2及连接 第三输出线圈的第三开关晶体管 K3断开,使得输出线圈釆用第一输出线圈, 其在第一输出线圈上的输出电压 Vo=A*输入电压 Vi> U0, 为了满足输出电 压 Vo=内部元件的启动电压 U0, 可以调整输入线圈与第一输出线圈的匝数 比实现;
同理, 当第一电压阔值 U2>内部元件的启动电压 U0>第一电压阔值 U1 时, 连接第一输出线圈的第一开关晶体管 K1断开及连接第二输出线圈的第 二开关晶体管 K2断开, 连接第三输出线圈的第三开关晶体管 Κ3闭合, 使 得输出线圈釆用两组, 即第一输出线圈和第三输出线圈, 其在第三输出线圈 上的输出电压 Vo=B*输入电压 Vi> U0且输出电压 Vo<C*输入电压 Vi, 为了 满足输出电压 Vo=内部元件的启动电压 U0, 可以调整输入线圈与第一、 第 三输出线圈的匝数比实现;
同理, 当内部元件的启动电压 U0>第二电压阔值 U2时(即也 >第一电 压阔值 U1 ), 连接第一输出线圈的第一开关晶体管 K1断开及连接第三输出 线圈的第三开关晶体管 K3 断开, 连接第二输出线圈的第二开关晶体管 K2 闭合, 使得输出线圈釆用三组, 即第一输出线圈、 第三输出线圈和第二输出 线圈,其在第二输出线圈上的输出电压 Vo=C*输入电压 Vi> U0,为了满足输 出电压 Vo=内部元件的启动电压 U0, 可以调整输入线圈与第一、 第二及第 三输出线圈的匝数比实现。
如图 7所示, 为本发明第二实施例提供的用于调整输出电压的电路的一 电路原理图, 方框中的电路为用于调整输出电压的电路, 该电路获得输入电 压源的输入电压 Vin, 经输出变压后输出电压给内部元件 LED。 其中,
输出变压器包括输入线圈 N1 , 以及位于次级的第一输出线圈 N2、 第二 输出线圈 N4和第三输出线圈 N3 , 第一输出线圈 N2、 第二输出线圈 N4和 第三输出线圈 N3三者相串联;
信号控制器包括第一比较器 OP2和第二比较器 OP1 , 二者均获得内部 元件 LED的启动电压 FB, 在第一比较器 OP2中与为第一电压阔值的 Vref2 进行比较后, 输出的电平信号 OutPut2为第一电平信号, 在第二比较器 OP1 中与为第二电压阔值的 Vrefl进行比较后, 输出的电平信号 OutPutl为第二 电平信号; 逻辑运算器包括第四开关晶体管 Q17和第五开关晶体管 Q18,二者相并 联且分别获得不同的电平信号, 输出第三电平信号给第三开关晶体管 Q13; 第一开关晶体管 Q2连接第一输出线圈 N2与内部元件 LED之间, 获得 为第一电平信号的 OutPut2, 导通时, 输出第一输出线圈 N2的输出电压给 内部元件 LED;
第二开关晶体管 Q1连接第二输出线圈 N4与内部元件 LED之间, 获得 为第二电平信号的 OutPutl , 导通时, 输出第一输出线圈 N2、 第二输出线圈 N4及第三输出线圈 N3三者的叠加输出电压给内部元件 LED;
第三开关晶体管 Q13连接第三输出线圈 N3与内部元件 LED之间, 导 通时, 输出第一输出线圈 N2及第三输出线圈 N3的叠加输出电压给内部元 件 LED。
结合参见图 8, 为本发明用于调整输出电压的方法的实施例。
如图 7所示, 为本发明第三实施例提供的用于调整输出电压的方法的流 程图。 本发明第三实施例中用于调整输出电压的方法, 其在本发明第一实施 例或本发明第二实施例中的用于调整输出电压的电路中实现, 所述方法包 括:
步骤 S101、 获得内部元件的启动电压, 并根据所述获得的内部元件的 启动电压, 确定所述电路中的第一电平信号及第二电平信号; 其中, 所述第 一电平信号为高电平信号或低电平信号, 所述第二电平信号为高电平信号或 低电平信号;
步骤 S102、 根据所述确定的第一电平信号及第二电平信号, 驱动所述 电路中与各输出线圈相连的各开关晶体管闭合或断开,从而控制输出电压的 大小。 本发明所提供的用于调整输出电压的电路和方法, 具有如下有益效果: 由于电路中的各输出线圈均与开关晶体管相连,通过获得的内部元件的 启动电压确定电路中的第一电平信号及第二电平信号的高低,信号控制器驱 动各开关晶体管闭合或断开, 从而控制输出线圈的组数输出不同大小的电 压, 因此无需更改电压输出模式, 就能满足输出电压相差较大的不同内部元 件之间的使用要求, 实现兼容宽范围的输出电压、 降低设计成本和缩短设计 周期的目的。
本领域普通技术人员可以理解实现上述实施例方法中的全部或部分步 骤是可以通过程序来指令相关的硬件来完成, 所述的程序可以存储于一计算 机可读取存储介质中, 所述的存储介质, 如 ROM/RAM、 磁盘、 光盘等。
以上所揭露的仅为本发明较佳实施例而已, 当然不能以此来限定本发明 之权利范围, 因此依本发明权利要求所作的等同变化, 仍属本发明所涵盖的 范围。

Claims

权 利 要 求
1、 一种用于调整输出电压的电路, 设置于输入电压源和内部元件之间, 其中, 包括输出变压器、第一开关晶体管、第二开关晶体管以及信号控制器; 其中,
所述输出变压器包括连接所述输入电压源的输入线圈, 以及位于次级的 第一输出线圈和第二输出线圈; 其中, 所述第一输出线圈与所述第二输出线 圈相串联,且所述第一输出线圈的电压输出端与所述第一开关晶体管的漏极 相连, 所述第二输出线圈的电压输出端与所述第二开关晶体管的漏极相连; 所述信号控制器包括与所述第一开关晶体管的栅极相连的第一电平信 号输出端, 与所述第二开关晶体管的栅极相连的第二电平信号输出端, 以及 与所述内部元件的一端相连的输入端,其用于才艮据所述内部元件的启动电压 与预设的第一电压阔值及预设的第二电压阔值进行比较后,在所述第一电平 信号输出端输出第一电平信号, 以及在所述第二电平信号输出端输出第二电 平信号;
所述第一开关晶体管的源极与所述内部元件的另一端相连,用于根据所 述第一电平信号输出端输出的第一电平信号的高低, 实现所述内部元件与所 述第一输出线圈之间的导通或断开, 其中, 在导通时, 输出所述第一输出线 圈的输出电压给所述内部元件;
所述第二开关晶体管的源极与所述内部元件的另一端相连,用于根据所 述第二电平信号输出端输出的第二电平信号的高低, 实现所述内部元件与所 述第二输出线圈之间的导通或断开, 其中, 在导通时, 输出所述第一输出线 圈与所述第二输出线圈的叠加输出电压给所述内部元件。
2、 如权利要求 1 所述的电路, 其中, 所述信号控制器包括第一比较器 和第二比较器; 其中,
所述第一比较器包括与所述内部元件的一端相连的输入端和所述第一 电平信号输出端, 其用于通过所述输入端获得所述内部元件的启动电压, 并 根据所述获得的内部元件的启动电压与所述预设的第一电压阔值进行比较 后, 在所述第一电平信号输出端输出所述第一电平信号;
所述第二比较器包括与所述内部元件的一端相连的输入端和所述第二 电平信号输出端, 其用于通过所述输入端获得所述内部元件的启动电压, 并 根据所述获得的内部元件的启动电压与所述预设的第二电压阔值进行比较 后, 在所述第二电平信号输出端输出所述第二电平信号; 其中, 所述预设的 第一电压阔值与所述预设的第二电压阔值相等。
3、 如权利要求 2所述的电路, 其中, 当所述获得的启动电压小于所述 预设的第一电压阔值时, 所述第一电平信号为高电平信号且所述第二电平信 号为低电平信号, 所述信号控制器驱动所述第一开关晶体管闭合及驱动所述 第二开关晶体管断开, 实现所述内部元件与所述第一输出线圈之间的导通, 输出所述第一输出线圈的输出电压给所述内部元件。
4、 如权利要求 2所述的电路, 其中, 当所述获得的启动电压大于所述 预设的第一电压阔值时, 所述第一电平信号为低电平信号且所述第二电平信 号为高电平信号, 所述信号控制器驱动所述第一开关晶体管断开及驱动所述 第二开关晶体管闭合, 实现所述内部元件与所述第二输出线圈之间的导通, 输出所述第一输出线圈与所述第二输出线圈的叠加输出电压给所述内部元 件。
5、 一种用于调整输出电压的电路, 设置于输入电压源和内部元件之间, 其中, 包括输出变压器、 第一开关晶体管、 第二开关晶体管、 第三开关晶体 管、 逻辑运算器以及信号控制器; 其中,
所述输出变压器包括连接所述输入电压源的输入线圈, 以及位于次级的 第一输出线圈、 第二输出线圈和第三输出线圈; 其中, 所述第三输出线圈设 置于所述第一输出线圈与所述第二输出线圈之间, 并与所述第一输出线圈及 所述第二输出线圈三者相串联,且所述第一输出线圈的电压输出端与所述第 一开关晶体管的漏极相连, 所述第二输出线圈的电压输出端与所述第二开关 晶体管的漏极相连, 所述第三输出线圈的电压输出端与所述第三开关晶体管 的漏极相连;
所述信号控制器具有与所述第一开关晶体管的栅极相连的第一电平信 号输出端, 与所述第二开关晶体管的栅极相连的第二电平信号输出端, 以及 与所述内部元件的一端相连的输入端,其用于才艮据所述内部元件的启动电压 与预设的第一电压阔值及预设的第二电压阔值进行比较后,在所述第一电平 信号输出端输出第一电平信号, 以及在所述第二电平信号输出端输出第二电 平信号;
所述逻辑运算器具有与所述第一电平信号输出端相连的第一端, 与所述 第二电平信号输出端相连的第二端, 以及与所述第三开关晶体管的栅极相连 的第三端, 或所述逻辑运算器具有与所述第二电平信号输出端相连的第一 端, 与所述第一电平信号输出端相连的第二端, 以及与所述第三开关晶体管 的栅极相连的第三端, 其用于根据所述第一电平信号及所述第二电平信号的 高低,确定通过所述第三端输出给所述第三开关晶体管的第三电平信号的高 低; 其中, 当所述第一电平信号且所述第二电平信号均为低电平信号或高电 平信号时, 所述第三电平信号为高电平信号; 当所述第一电平信号为低电平 信号且所述第二电平信号为高电平信号,或所述第一电平信号为高电平信号 且所述第二电平信号为低电平信号时, 所述第三电平信号为低电平信号; 所述第一开关晶体管的源极与所述内部元件的另一端相连,用于根据所 述第一电平信号输出端输出的第一电平信号的高低, 实现所述内部元件与所 述第一输出线圈的导通或断开, 其中, 在在导通时, 输出所述第一输出线圈 的输出电压给所述内部元件;
所述第二开关晶体管的源极与所述内部元件的另一端相连,用于根据所 述第二电平信号输出端输出的第二电平信号的高低, 实现所述内部元件与所 述第二输出线圈的导通或断开, 其中, 在导通时, 输出所述第一输出线圈、 所述第二输出线圈及所述第三输出线圈三者的叠加输出电压给所述内部元 件;
所述第三开关晶体管的源极与所述内部元件的另一端相连,用于根据所 述逻辑运算器输出的第三电平信号的高低, 实现所述内部元件与所述第三输 出线圈的导通或断开, 其中, 在导通时, 输出所述第一输出线圈及所述第三 输出线圈的叠加输出电压给所述内部元件。
6、 如权利要求 5所述的电路, 其中, 所述信号控制器包括第一比较器 和第二比较器; 其中,
所述第一比较器包括与所述内部元件的一端相连的输入端和所述第一 电平信号输出端, 其用于通过所述输入端获得所述内部元件的启动电压, 并 根据所述获得的内部元件的启动电压与所述预设的第一电压阔值进行比较 后, 在所述第一电平信号输出端输出所述第一电平信号;
所述第二比较器包括与所述内部元件的一端相连的输入端和所述第二 电平信号输出端, 其用于通过所述输入端获得所述内部元件的启动电压, 并 根据所述获得的内部元件的启动电压与所述预设的第二电压阔值进行比较 后, 在所述第二电平信号输出端输出所述第二电平信号; 其中, 所述预设的 第二电压阔值大于所述预设的第一电压阔值。
7、 如权利要求 6所述的电路, 其中, 所述逻辑运算器包括第四开关晶 体管和与所述第四开关晶体管相并联的第五开关晶体管; 其中,
所述第四开关晶体管的漏极与所述第五开关晶体管的漏极相连,还与所 述第三开关晶体管的栅极相连, 所述第四开关晶体管的源极与所述第五开关 晶体管的源极相连, 所述第四开关晶体管的栅极与所述第一电平信号输出端 相连, 所述第五开关晶体管的栅极与所述第二电平信号输出端相连; 或 所述第四开关晶体管的漏极与所述第五开关晶体管的漏极相连,还与所 述第三开关晶体管的栅极相连, 所述第四开关晶体管的源极与所述第五开关 晶体管的源极相连, 所述第四开关晶体管的栅极与所述第二电平信号输出端 相连, 所述第五开关晶体管的栅极与所述第一电平信号输出端相连。
8、 如权利要求 7所述的电路, 其中, 当获得的启动电压小于所述预设 的第一电压阔值时, 所述第一电平信号为高电平信号且所述第二电平信号为 低电平信号, 得到所述第三电平信号为低电平信号, 所述信号控制器驱动所 述第一开关晶体管闭合,驱动所述第二开关晶体管及所述第三开关晶体管断 开, 实现所述内部元件与所述第一输出线圈之间的导通, 输出所述第一输出 线圈的输出电压给所述内部元件。
9、 如权利要求 7所述的电路, 其中, 当获得的启动电压位于所述预设 的第一电压阔值和所述预设的第二电压阔值之间时 , 所述第一电平信号且所 述第二电平信号均为低电平信号, 得到所述第三电平信号为高电平信号, 所 述信号控制器驱动所述第三开关晶体管闭合,驱动所述第一开关晶体管及所 述第二开关晶体管断开, 实现所述内部元件与所述第三输出线圈之间的导 通,输出所述第一输出线圈和所述第三输出线圈的叠加输出电压给所述内部 元件。
10、 如权利要求 7所述的方法, 其中, 当获得的启动电压大于所述预设 的第二电压阔值时, 所述第一电平信号为低电平信号且所述第二电平信号为 高电平信号, 得到所述第三电平信号为低电平信号, 所述信号控制器驱动所 述第二开关晶体管闭合,驱动所述第一开关晶体管及所述第三开关晶体管断 开, 实现所述内部元件与所述第二输出线圈之间的导通, 输出所述第一输出 线圈、所述第二输出线圈及所述第三输出线圈三者的叠加输出电压给所述内 部元件。
11、 一种用于调整输出电压的方法, 其中, 所述方法包括:
获得内部元件的启动电压, 并根据所述获得的内部元件的启动电压, 确 定所述电路中的第一电平信号及第二电平信号; 其中, 所述第一电平信号为 高电平信号或低电平信号, 所述第二电平信号为高电平信号或低电平信号; 根据所述确定的第一电平信号及第二电平信号,通过所述电路中的信号 控制器驱动所述电路中与各输出线圈相连的各开关晶体管闭合或断开,从而 控制输出电压的大小。
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