WO2018006492A1 - 直流-直流转换电路以及液晶显示器 - Google Patents

直流-直流转换电路以及液晶显示器 Download PDF

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Publication number
WO2018006492A1
WO2018006492A1 PCT/CN2016/098558 CN2016098558W WO2018006492A1 WO 2018006492 A1 WO2018006492 A1 WO 2018006492A1 CN 2016098558 W CN2016098558 W CN 2016098558W WO 2018006492 A1 WO2018006492 A1 WO 2018006492A1
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Prior art keywords
energy storage
storage module
feedback signal
module
current
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Ceased
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PCT/CN2016/098558
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English (en)
French (fr)
Inventor
周丽
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 US15/303,803 priority Critical patent/US10312809B2/en
Publication of WO2018006492A1 publication Critical patent/WO2018006492A1/zh
Anticipated expiration legal-status Critical
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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
    • 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
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • 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
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0009—Devices or circuits for detecting current in a converter

Definitions

  • the present invention generally relates to the technical field of liquid crystal display driving circuits, and more particularly to a DC-DC conversion circuit and a liquid crystal display.
  • a direct current-direct current (DC-DC) conversion circuit is generally used to convert an input voltage into various voltage values required for display of a liquid crystal display.
  • the DC-DC conversion circuit is divided into three categories: a step-up DC-DC conversion circuit, a step-down DC-DC conversion circuit, and a buck-boost DC-DC conversion circuit.
  • the step-up DC-DC conversion circuit realizes a stable output of the voltage through its own boosting circuit, feedback circuit, and feedback control circuit.
  • the output current of the existing DC-DC conversion circuit is affected by the load.
  • the output current of the DC-DC conversion circuit changes with the load, so that the efficiency of the DC-DC conversion circuit is Stability is affected.
  • the load connected to the DC-DC conversion circuit increases and the output voltage of the conversion circuit remains unchanged, the magnitude of the output current of the conversion circuit increases, so that the loss of the conversion circuit increases and the efficiency decreases.
  • the stability of the loop formed by the DC-DC conversion circuit and the load also deteriorates.
  • the present invention provides a DC-DC conversion circuit, including: a first energy storage module, a second energy storage module, a current regulation module, and a current detection module;
  • the second energy storage module outputs a current to the outside;
  • the current detecting module detects the magnitude of the output current of the second energy storage module, and outputs the inverse according to the detected output current of the second energy storage module.
  • the current adjustment module receives the feedback signal, and adjusts a peak value of an output current of the first energy storage module according to the feedback signal.
  • the current regulation module includes a first controller and a switch module, one connection end of the switch module is connected to an input end of the second energy storage module, and another connection end of the switch module is grounded;
  • the first controller receives the feedback signal, and controls a switching frequency of the switch module according to the feedback signal, thereby controlling a charging and discharging time of the first energy storage module to adjust an output of the first energy storage module The peak value of the current.
  • the current detecting module When the magnitude of the output current of the second energy storage module is less than a predetermined threshold, the current detecting module outputs a first feedback signal as the feedback signal; the first controller receives the first feedback signal, and And increasing a switching frequency of the switch module according to the first feedback signal, thereby controlling the first energy storage module to reduce a charging and discharging time to reduce a peak value of an output current of the first energy storage module.
  • the current detecting module When the magnitude of the output current of the second energy storage module is greater than a predetermined threshold, the current detecting module outputs a second feedback signal as the feedback signal; the first controller receives the second feedback signal, and And reducing a switching frequency of the switch module according to the second feedback signal, thereby controlling the first energy storage module to increase a charging and discharging time to increase a peak value of an output current of the first energy storage module.
  • the current detecting module When the magnitude of the output current of the second energy storage module is equal to a predetermined threshold, the current detecting module outputs a third feedback signal as the feedback signal; the first controller receives the third feedback signal, and Controlling, according to the third feedback signal, that the switching frequency of the switch module remains unchanged, thereby controlling the charging and discharging time of the first energy storage module to remain unchanged, so that the peak value of the output current of the first energy storage module is constant.
  • the current regulation module includes a second controller and a current limiting module, the current limiting module is connected between the first energy storage module and the second energy storage module; wherein the second controller receives Deriving a feedback signal, and controlling the current limiting module to adjust a peak value of an output current of the first energy storage module according to the feedback signal.
  • the current detection module When the magnitude of the output current of the second energy storage module is less than a predetermined threshold, the current detection module outputs a first feedback signal as the feedback signal; the second controller receives the first feedback signal, and Controlling, by the first feedback signal, the current limiting module to reduce a peak value of an output current of the first energy storage module.
  • the current detection module When the magnitude of the output current of the second energy storage module is greater than a predetermined threshold, the current detection module outputs a second feedback signal as the feedback signal; the second controller receives the second feedback signal, and Controlling, by the second feedback signal, the current limiting module to increase a peak value of an output current of the first energy storage module.
  • the current detection module When the magnitude of the output current of the second energy storage module is equal to a predetermined threshold, the current detection module outputs a third feedback signal as the feedback signal; the second controller receives the third feedback signal, and Controlling, by the third feedback signal, the current limiting module to keep the peak value of the output current of the first energy storage module unchanged.
  • the first energy storage module includes an inductor.
  • the second energy storage module includes a first Zener diode and a capacitor; an anode of the first Zener diode is connected to an output end of the first energy storage module, and a cathode of the first Zener diode is connected to a capacitor At one end, the other end of the capacitor is grounded.
  • the switch module includes a first field effect transistor.
  • the current limiting module includes a plurality of current limiting units, and the second controller turns on one of the plurality of current limiting units according to the feedback signal, and turns off the remaining current limiting units to adjust the first energy storage unit.
  • the peak value of the output current of the module; the peaks of the currents that different current limiting units can pass are different; one connection end of each current limiting unit is connected to the output end of the first energy storage module, and the other of the current limiting units A connection is connected to the input of the second energy storage module.
  • any one of the current limiting units includes a second field effect transistor, a first resistor, a second resistor, a triode, and a second Zener diode; a second controller is coupled to the gate of the second field effect transistor to control the a second field effect transistor is turned on or off, a source of the second field effect transistor is connected to an output end of the first energy storage module, and a drain of the second field effect transistor is connected to the second resistor
  • One end of the device and the collector of the triode, the other end of the second resistor is connected to the base of the triode and the anode of the second Zener diode, the emitter of the triode being connected to the first resistor
  • the other end of the first resistor is connected to the cathode of the second Zener diode and the input end of the second energy storage module.
  • the invention provides a DC-DC conversion circuit for detecting a second storage mode by a current detecting module
  • the output current of the block is outputted and the feedback signal is output.
  • the current adjustment module adjusts the peak value of the output current of the first energy storage module according to the received feedback signal, thereby achieving the control output current, thereby effectively improving the efficiency and stability of the conversion circuit.
  • FIG. 1 is a schematic diagram showing a DC-DC conversion circuit of an embodiment of the present invention.
  • FIG. 2 shows a schematic diagram of one embodiment of the DC-DC conversion circuit of FIG. 1.
  • FIG. 3 is a schematic diagram showing another embodiment of the DC-DC conversion circuit of FIG. 1.
  • FIG. 4 is a schematic diagram showing another embodiment of the DC-DC conversion circuit of FIG. 1.
  • FIG. 5 shows a specific example of the DC-DC conversion circuit of FIG.
  • a DC-DC conversion circuit according to an embodiment of the present invention will be described below with reference to FIGS. 1 through 5. Among them, the DC-DC conversion circuit according to an embodiment of the present invention can be used in a liquid crystal display.
  • FIG. 1 shows a schematic diagram of a DC-DC conversion circuit in accordance with an embodiment of the present invention.
  • the DC-DC conversion circuit proposed in the embodiment of the present invention includes: a first energy storage module 110, a second energy storage module 120, a current adjustment module 130, and a current detection module 140.
  • the first energy storage module 110 outputs current to the outside via the second energy storage module 120; the current detection module 140 detects the magnitude of the output current of the second energy storage module 120, and according to the detected output current of the second energy storage module 120.
  • the size output feedback signal; the current adjustment module 130 receives the feedback signal, and adjusts a peak value of the output current of the first energy storage module 110 according to the feedback signal.
  • the first energy storage module 110 includes an inductor.
  • the output current of the second energy storage module 120 is used as a current outputted by the DC-DC conversion circuit to the outside (for example, a load).
  • the magnitude of the output current corresponds to In this case, the magnitude of the output current of the second energy storage module 120 detected by the current detecting module 140 changes, and the current detecting module 140 outputs according to the detected output current of the second energy storage module 120. Corresponding feedback signal.
  • the detected output current of the second energy storage module 120 is smaller than a predetermined threshold, and the current detecting module 140 outputs a first feedback signal as the feedback signal; when the load increases, the detected The magnitude of the output current of the second energy storage module 120 is greater than a predetermined threshold, and the current detecting module 140 outputs a second feedback signal as the feedback signal; under normal circumstances, the detected output current of the second energy storage module 120 is equal to a predetermined amount.
  • the threshold, current detection module 140 outputs a third feedback signal as the feedback signal.
  • the output current of the DC-DC converter circuit can be calculated by the following equation (1):
  • I o is the magnitude of the output current of the DC-DC conversion circuit (ie, the magnitude of the output current of the second energy storage module 120), D is the duty ratio, and I pk is the first energy storage module 110.
  • the peak value of the output current ie, the peak value of the inductor's inductor current
  • V i is the input voltage
  • L is the inductance of the inductor
  • f is the switching frequency.
  • the output current I o is the magnitude and the switching frequency f and the first energy storage module 110
  • the peak value of the output current is related. Therefore, the magnitude of the output current I o of the DC-DC conversion circuit can be controlled by the current adjustment module 130 changing the switching frequency f and/or adjusting the peak value of the output current of the first energy storage module 110.
  • Example DC converter output current I o of the circuit size - below with reference to FIGS. 2 to 5 by changing the switching frequency f and / or adjust the peak output current of the first energy storage module 110 to control the DC be described in detail.
  • FIG. 2 shows a schematic diagram of one embodiment of the DC-DC conversion circuit of FIG. 1.
  • the DC-DC conversion circuit includes: a first energy storage module 110, a second energy storage module 120, a current adjustment module 130, and a current detection module 140.
  • the current adjustment module 130 includes a first controller 132 and a switch module 134.
  • the first energy storage module 110, the second energy storage module 120, and the current detection module 140 shown in FIG. 2 are the same as those shown in FIG. 1, and are not described again.
  • One connection end of the switch module 134 is connected to the input end of the second energy storage module 120, the other connection end of the switch module 134 is grounded, and the first controller 132 is connected to the control end of the switch module 134 to control the switching frequency of the switch module 134.
  • the first controller 132 receives the feedback signal, and controls the switching frequency of the switch module 134 according to the feedback signal, thereby controlling the charging and discharging time of the first energy storage module 110 to adjust the output current of the first energy storage module 110. Peak.
  • the charge and discharge time period of the first energy storage module 110 is proportional to the peak value of the output current of the first energy storage module 110.
  • the charging and discharging time of the first energy storage module 110 increases, and the peak value of the output current of the first energy storage module 110 increases; the charging and discharging time of the first energy storage module 110 decreases, and the output of the first energy storage module 110 The peak value of the current decreases; the charge and discharge time of the first energy storage module 110 does not change, and the peak value of the output current of the first energy storage module 110 does not change.
  • the switching frequency of the switch module 134 is the same as the frequency of charging and discharging of the first energy storage module 110.
  • the frequency of charging and discharging of the first energy storage module 110 is inversely proportional to the time period of charging and discharging, and since the duty ratio is constant, then The switching frequency is inversely proportional to the time of charging and the time of discharging during each charging and discharging time period. In this case, when the switching frequency is increased, the frequency of charging and discharging of the first energy storage module 110 is increased, and then the charging and discharging time of the first energy storage module 110 is decreased, and the peak value of the output current of the first energy storage module 110 is increased.
  • the switching frequency When the switching frequency is decreased, the frequency of charging and discharging of the first energy storage module 110 is decreased, and then the charging and discharging time of the first energy storage module 110 is increased, and the peak value of the output current of the first energy storage module 110 is increased;
  • the switching frequency is constant, the frequency of charging and discharging of the first energy storage module 110 does not change, and then the charging and discharging time of the first energy storage module 110 does not change, and the peak value of the output current of the first energy storage module 110 remains unchanged.
  • the current detecting module 140 When the magnitude of the output current of the second energy storage module 120 is less than a predetermined threshold, the current detecting module 140 outputs a first feedback signal as the feedback signal; the first controller 132 receives the first feedback signal, and according to the The first feedback signal increases the switching frequency of the switch module 134, thereby controlling the first energy storage module 110 to reduce the charge and discharge time to reduce the peak value of the output current of the first energy storage module 110.
  • the switching frequency f in the above equation (1) is increased, resulting in a decrease in the peak value I pk of the output current of the first energy storage module, so that Decreasing, thereby reducing the magnitude of the output current I o of the DC-DC conversion circuit.
  • the current detecting module 140 When the magnitude of the output current of the second energy storage module 120 is greater than a predetermined threshold, the current detecting module 140 outputs a second feedback signal as the feedback signal; the first controller 132 receives the second feedback signal, and according to the The second feedback signal reduces the switching frequency of the switch module 134, thereby controlling the first energy storage module 110 to increase the charge and discharge time to increase the peak value of the output current of the first energy storage module 110.
  • the switching frequency f in the above formula (1) is lowered, causing the peak value I pk of the output current of the first energy storage module to rise, so that Increase, thereby increasing the magnitude of the output current I o of the DC-DC conversion circuit.
  • the current detecting module 140 When the magnitude of the output current of the second energy storage module 120 is equal to a predetermined threshold, the current detecting module 140 outputs a third feedback signal as the feedback signal; the first controller 132 receives the third feedback signal, and according to the The third feedback signal controls the switching frequency of the switch module 134 to remain unchanged, thereby controlling the charge and discharge time of the first energy storage module 110 to remain unchanged, so that the peak value of the output current of the first energy storage module 110 remains unchanged.
  • the switching frequency f does not change, and the peak value I pk of the output current of the first energy storage module does not change, so that the magnitude of the output current I o of the DC-DC conversion circuit does not change.
  • FIG. 3 is a schematic diagram showing another embodiment of the DC-DC conversion circuit of FIG. 1.
  • the DC-DC conversion circuit includes: a first energy storage module 110, a second energy storage module 120, a current adjustment module 130, and a current detection module 140.
  • the current regulation module 130 includes a second controller 136 and a current limiting module 137.
  • the first energy storage module 110, the second energy storage module 120, and the current detection module 140 shown in FIG. 3 are the same as those shown in FIG. 1, and are not described again.
  • the current limiting module 137 is connected between the first energy storage module 110 and the second energy storage module 120; the second controller 136 receives the feedback signal, and controls the current limiting module 137 to adjust the first energy storage module according to the feedback signal.
  • the peak value of the output current of 110 is connected between the first energy storage module 110 and the second energy storage module 120; the second controller 136 receives the feedback signal, and controls the current limiting module 137 to adjust the first energy storage module according to the feedback signal.
  • the peak value of the output current of 110 is connected between the first energy storage module 110 and the second energy storage module 120; the second controller 136 receives the feedback signal, and controls the current limiting module 137 to adjust the first energy storage module according to the feedback signal.
  • the peak value of the output current of 110 is connected between the first energy storage module 110 and the second energy storage module 120; the second controller 136 receives the feedback signal, and controls the current limiting module 137 to adjust the first energy storage module according to the feedback signal.
  • the peak value of the output current of 110 is connected between
  • the current limiting module 137 includes a plurality of current limiting units. Different current limiting units are capable of passing different peak currents. In other words, the peak of the current that the first energy storage module 110 can output via different current limiting units The values are different. One connection end of each current limiting unit is connected to an output end of the first energy storage module 110, and the other connection end of each current limiting unit is connected to an input end of the second energy storage module 120.
  • the current detecting module 140 When the magnitude of the output current of the second energy storage module 120 is less than a predetermined threshold, the current detecting module 140 outputs a first feedback signal as the feedback signal; the second controller 136 receives the first feedback signal, and according to the The first feedback signal control current limiting module 137 reduces the peak value of the output current of the first energy storage module 110.
  • the second controller 136 turns on a current limiting unit that is lower than a peak of a current that the current current limiting unit can pass, such that the first energy storage module 110 passes the current limiting The peak value of the current output by the unit is lowered.
  • the switching frequency f in the above equation (1) is constant, and the peak value I pk of the output current of the first energy storage module is lowered, thereby reducing the magnitude of the output current I o of the DC-DC conversion circuit. .
  • the current detection module 140 When the magnitude of the output current of the second energy storage module 120 is greater than a predetermined threshold, the current detection module 140 outputs a second feedback signal as the feedback signal; the second controller 136 receives the second feedback signal, and according to the The second feedback signal controls the current limiting module 137 to increase the peak value of the output current of the first energy storage module 110.
  • the second controller 136 turns on a current limiting unit that is higher than a peak of current that the current current limiting unit can pass, such that the first energy storage module 110 passes the current limiting
  • the switching frequency f in the above equation (1) does not change, and the peak value I pk of the output current of the first energy storage module increases, thereby increasing the output current I o of the DC-DC conversion circuit. the size of.
  • the current detecting module 140 When the magnitude of the output current of the second energy storage module 120 is equal to a predetermined threshold, the current detecting module 140 outputs a third feedback signal as the feedback signal; the second controller 136 receives the third feedback signal, and according to the The third feedback signal control current limiting module 137 maintains the peak value of the output current of the first energy storage module 110 unchanged.
  • the second controller 136 maintains the opening of the current current limiting unit, so that the peak value of the current output by the first energy storage module 110 via the current limiting unit remains unchanged, then
  • the switching frequency f is constant, and the peak value I pk of the output current of the first energy storage module is unchanged, so that the magnitude of the output current I o of the DC-DC conversion circuit remains unchanged.
  • FIG. 4 is a schematic diagram showing another embodiment of the DC-DC conversion circuit of FIG. 1.
  • the DC-DC conversion circuit includes: a first energy storage module 110, a second energy storage module 120, a current adjustment module 130, and a current detection module 140.
  • the current adjustment module 130 includes a first controller 132, a switch module 134, a second controller 136, and a current limiting module 137.
  • the current detecting module 140 When the magnitude of the output current of the second energy storage module 120 is less than a predetermined threshold, the current detecting module 140 outputs a first feedback signal as the feedback signal.
  • the first controller 132 receives the first feedback signal, and increases the switching frequency of the switch module 134 according to the first feedback signal, thereby controlling the first energy storage module 110 to reduce the charging and discharging time to reduce the first energy storage module 110.
  • a peak of the output current the second controller 136 receives the first feedback signal, and according to the first feedback signal, turns on a current limiting unit that is lower than a peak of a current that the current current limiting unit can pass, thereby The peak value of the current output by the energy storage module 110 via the current limiting unit is reduced.
  • the switching frequency f in the above formula (1) is increased, resulting in a decrease in the peak value I pk of the output current of the first energy storage module, so that Decreasing, and further reducing the peak value I pk of the output current of the first energy storage module through the current limiting module, so that Further reducing, thereby reducing the magnitude of the output current I o of the DC-DC conversion circuit.
  • the current detecting module 140 When the magnitude of the output current of the second energy storage module 120 is greater than a predetermined threshold, the current detecting module 140 outputs a second feedback signal as the feedback signal.
  • the first controller 132 receives the second feedback signal, and reduces the switching frequency of the switch module 134 according to the second feedback signal, thereby controlling the first energy storage module 110 to increase the charging and discharging time to raise the first energy storage module.
  • a peak value of the output current of 110 the second controller 136 receives the second feedback signal, and according to the second feedback signal, turns on a current limiting unit that is higher than a peak of a current that the current current limiting unit can pass, thereby The peak value of the current output by the energy storage module 110 via the current limiting unit rises.
  • the switching frequency f in the above formula (1) is lowered, causing the peak value I pk of the output current of the first energy storage module to rise, so that Is increased, while passing through the peak I pk a first energy storage module is further increased output current limiting module so Further increasing, thereby increasing the magnitude of the output current I o of the DC-DC conversion circuit.
  • the current detecting module 140 When the magnitude of the output current of the second energy storage module 120 is equal to a predetermined threshold, the current detecting module 140 outputs a third feedback signal as the feedback signal.
  • the first controller 132 receives the third feedback signal, and controls the switching frequency of the switch module 134 to remain unchanged according to the third feedback signal, thereby controlling the charging and discharging time of the first energy storage module 110 to remain unchanged.
  • the peak value of the output current of the energy storage module 110 remains unchanged; the second controller 136 receives the third feedback signal, and maintains the current current limiting unit on according to the third feedback signal to make the first energy storage
  • the peak value of the current output by module 110 via the current limiting unit remains unchanged.
  • the switching frequency f in the above equation (1) does not change, and the peak value I pk of the output current of the first energy storage module does not change, so that the magnitude of the output current I o of the DC-DC conversion circuit remains unchanged.
  • FIG. 5 shows a specific example of the DC-DC conversion circuit of FIG.
  • first energy storage module 110 includes an inductor L 1, the DC voltage end of the inductor to receive an input of L 1. It should be understood that the first energy storage module in this embodiment is merely exemplary and can also be implemented by other energy storage modules.
  • the second energy storage module 120 includes a first Zener diode D 1 and a capacitor C 1 ; the anode of the first Zener diode D 1 is connected to the other end of the inductor L 1 , and the cathode of the first Zener diode D 1 is connected to the capacitor one end C 1 of the capacitor C 1 to the other end. It should be understood that the second energy storage module in this embodiment is merely exemplary and can also be implemented by other energy storage modules.
  • the switch module 134 includes a first field effect transistor Q 1.
  • the first field effect transistor Q 1 is an N-channel depletion type field effect transistor
  • the second controller 136 is connected to the gate of the first field effect transistor Q 1 'to control the first field effect transistor turn on Q 1 or turned off
  • the drain of the first field effect transistor Q 1 is connected to the anode of the first Zener diode D 1
  • a first field effect transistor Q 1 is grounded source.
  • the switch module in this embodiment is merely exemplary and can also be implemented by other switch modules.
  • the current limiting module 137 includes a plurality of current limiting units 138.
  • the basic structure of any one of the current limiting units 138 will be described in detail below.
  • the current limiting unit 138 includes a second field effect transistor Q 2 , a first resistor R 1 , a second resistor R 2 , a first transistor T 1 , and a second Zener diode D 2 ; the second controller 136 is connected to the second gate of FET Q 2 to control the second field effect transistor Q 2 is turned on or off, a source of the second FET Q 2 is connected to the other end of the inductor of L 1, the second field effect transistor Q The drain of 2 is connected to one end of the second resistor R 2 and the collector of the first transistor T 1 , and the other end of the second resistor R 2 is connected to the base of the first transistor T 1 and the second Zener diode D the anode 2, T-emitting electrode of the first transistor 1 is connected to one end of the first resistor of R 1, the other end of the first resistors R 1 connected to the cathode of the second zener diode D 2 and the anode of the first zener diode D 1. It should be understood
  • the current detection module detects the magnitude of the output current of the second energy storage module and outputs a feedback signal
  • the current adjustment module adjusts the output of the first energy storage module according to the received feedback signal.
  • the peak value of the current in turn, achieves control of the output current, effectively improving the efficiency and stability of the conversion circuit.

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Abstract

一种直流-直流转换电路，包括：第一储能模块（110）、第二储能模块（120）、电流调节模块（130）、电流侦测模块（140）；所述第一储能模块（110）经由所述第二储能模块（120）向外部输出电流；所述电流侦测模块（140）检测所述第二储能模块（120）的输出电流的大小，并根据检测的第二储能模块（120）的输出电流的大小输出反馈信号；所述电流调节模块（130）接收所述反馈信号，并根据所述反馈信号调节所述第一储能模块（110）的输出电流的峰值，所述直流-直流转换电路可以实现控制输出电流的大小，有效提高转换电路的效率和稳定性。

Description

直流-直流转换电路以及液晶显示器 技术领域
本发明总体说来涉及液晶显示器驱动电路的技术领域，更具体地讲，涉及一种直流-直流转换电路以及液晶显示器。
背景技术
在现有的液晶显示器驱动电路中，通常采用直流-直流(DC-DC)转换电路将输入电压转换成液晶显示器显示所需要的各种电压值。直流-直流转换电路分为三类：升压型直流-直流转换电路、降压型直流-直流转换电路以及升降压直流-直流转换电路。例如，升压型直流-直流转换电路通过自身的升压电路、反馈电路和反馈控制电路来实现电压的稳定输出。
但是，现有的直流-直流转换电路的输出电流受负载的影响，当负载变化时，直流-直流转换电路的输出电流的大小随着负载的变化而变化，使直流-直流转换电路的效率和稳定性受到影响。例如，当连接到直流-直流转换电路的负载增大且该转换电路的输出电压保持不变时，该转换电路的输出电流的大小增大，从而该转换电路的损耗增大、效率降低，由该直流-直流转换电路和负载构成的环路的稳定性也变差。
因此，亟需开发一种新型的直流-直流转换电路，以解决上述存在的问题。
发明内容
本发明的目的在于提供一种直流-直流转换电路，通过控制输出电流的大小，有效提高转换电路的效率和稳定性。
为实现上述发明目的，本发明提供一种直流-直流转换电路，包括：第一储能模块、第二储能模块、电流调节模块、电流侦测模块；所述第一储能模块经由所述第二储能模块向外部输出电流；所述电流侦测模块检测所述第二储能模块的输出电流的大小，并根据检测的第二储能模块的输出电流的大小输出反 馈信号；所述电流调节模块接收所述反馈信号，并根据所述反馈信号调节所述第一储能模块的输出电流的峰值。
所述电流调节模块包括第一控制器和开关模块，所述开关模块的一个连接端连接到所述第二储能模块的输入端，所述开关模块的另一个连接端接地；其中，所述第一控制器接收所述反馈信号，并根据所述反馈信号控制所述开关模块的开关频率，从而控制所述第一储能模块的充放电时间，以调节所述第一储能模块的输出电流的峰值。
当所述第二储能模块的输出电流的大小小于预定阈值时，所述电流侦测模块输出第一反馈信号作为所述反馈信号；所述第一控制器接收所述第一反馈信号，并根据所述第一反馈信号提高所述开关模块的开关频率，从而控制所述第一储能模块减少充放电时间，以降低所述第一储能模块的输出电流的峰值。
当所述第二储能模块的输出电流的大小大于预定阈值时，所述电流侦测模块输出第二反馈信号作为所述反馈信号；所述第一控制器接收所述第二反馈信号，并根据所述第二反馈信号降低所述开关模块的开关频率，从而控制所述第一储能模块增加充放电时间，以升高所述第一储能模块的输出电流的峰值。
当所述第二储能模块的输出电流的大小等于预定阈值时，所述电流侦测模块输出第三反馈信号作为所述反馈信号；所述第一控制器接收所述第三反馈信号，并根据所述第三反馈信号控制所述开关模块的开关频率保持不变，从而控制所述第一储能模块的充放电时间保持不变，使所述第一储能模块的输出电流的峰值的保持不变。
所述电流调节模块包括第二控制器和限流模块，所述限流模块连接在所述第一储能模块与所述第二储能模块之间；其中，所述第二控制器接收所述反馈信号，并根据所述反馈信号控制所述限流模块调节所述第一储能模块的输出电流的峰值。
当所述第二储能模块的输出电流的大小小于预定阈值时，所述电流侦测模块输出第一反馈信号作为所述反馈信号；所述第二控制器接收所述第一反馈信号，并根据所述第一反馈信号控制所述限流模块降低所述第一储能模块的输出电流的峰值。
当所述第二储能模块的输出电流的大小大于预定阈值时，所述电流侦测模块输出第二反馈信号作为所述反馈信号；所述第二控制器接收所述第二反馈信号，并根据所述第二反馈信号控制所述限流模块升高所述第一储能模块的输出电流的峰值。
当所述第二储能模块的输出电流的大小等于预定阈值时，所述电流侦测模块输出第三反馈信号作为所述反馈信号；所述第二控制器接收所述第三反馈信号，并根据所述第三反馈信号控制所述限流模块保持所述第一储能模块的输出电流的峰值不变。
所述第一储能模块包括电感器。
所述第二储能模块包括第一稳压二极管和电容器；所述第一稳压二极管的阳极连接到所述第一储能模块的输出端，所述第一稳压二极管的阴极连接到电容器的一端，所述电容器的另一端接地。
所述开关模块包括第一场效应晶体管。
所述限流模块包括多个限流单元，所述第二控制器根据所述反馈信号开启所述多个限流单元中的一个，关闭其余的限流单元，以调节所述第一储能模块的输出电流的峰值；不同的限流单元所能够通过的电流的峰值不同；每个限流单元的一个连接端连接到第一储能模块的输出端，所述每个限流单元的另一个连接端连接到所述第二储能模块的输入端。
任意一个限流单元包括第二场效应晶体管、第一电阻器、第二电阻器、三极管、第二稳压二极管；第二控制器连接到所述第二场效应晶体管的栅极以控制所述第二场效应晶体管导通或截止，所述第二场效应晶体管的源极连接到所述第一储能模块的输出端，所述第二场效应晶体管的漏极连接到所述第二电阻器的一端和三极管的集电极，所述第二电阻器的另一端连接到所述三极管的基极和第二稳压二极管的阳极，所述三极管的发射极连接到所述第一电阻器的一端，所述第一电阻器的另一端连接到所述第二稳压二极管的阴极和第二储能模块的输入端。
本发明提供一种直流-直流转换电路，通过电流侦测模块检测第二储能模 块的输出电流的大小并输出反馈信号，电流调节模块根据接收反馈信号调节第一储能模块的输出电流的峰值，进而实现控制输出电流的大小，有效提高转换电路的效率和稳定性。
附图说明
图1示出本发明实施例的直流-直流转换电路的示意图。
图2示出图1的直流-直流转换电路的一个实施例的示意图。
图3示出图1的直流-直流转换电路的另一实施例的示意图。
图4示出图1的直流-直流转换电路的另一实施例的示意图。
图5示出图4的直流-直流转换电路的一个具体示例。
具体实施方式
下面参照图1至图5描述根据本发明的实施例的直流-直流转换电路。其中，根据本发明的实施例的直流-直流转换电路可用于液晶显示器中。
图1示出根据本发明实施例的直流-直流转换电路的示意图。
参照图1，本发明的实施例中提出的直流-直流转换电路包括：第一储能模块110、第二储能模块120、电流调节模块130、电流侦测模块140。
第一储能模块110经由第二储能模块120向外部输出电流；电流侦测模块140检测第二储能模块120的输出电流的大小，并根据检测的第二储能模块120的输出电流的大小输出反馈信号；电流调节模块130接收所述反馈信号，并根据所述反馈信号调节第一储能模块110的输出电流的峰值。
优选地，第一储能模块110包括电感器。
应当理解，第二储能模块120的输出电流作为直流-直流转换电路向外部(例如负载)输出的电流，当负载发生变化且该转换电路的输出电压不变时，所述输出电流的大小相应的变化，在此情况下，电流侦测模块140检测的第二储能模块120的输出电流的大小发生变化，该电流侦测模块140根据检测的第二储能模块120的输出电流的大小输出相应的反馈信号。
具体地，当负载减小时，检测的第二储能模块120的输出电流的大小小于预定阈值，电流侦测模块140输出第一反馈信号作为所述反馈信号；当负载增大时，检测的第二储能模块120的输出电流的大小大于预定阈值，电流侦测模块140输出第二反馈信号作为所述反馈信号；在正常情况下，检测的第二储能模块120的输出电流的大小等于预定阈值，电流侦测模块140输出第三反馈信号作为所述反馈信号。
直流-直流转换电路的输出电流的大小可通过下面的式(1)计算：
Figure PCTCN2016098558-appb-000001
式(1)中，Io为直流-直流转换电路的输出电流的大小(即第二储能模块120的输出电流的大小)，D为占空比，Ipk为第一储能模块110的输出电流的峰值(即电感器的电感电流的峰值)，Vi为输入电压，L为电感器的电感值，f为开关频率。
在本实施例的直流-直流转换电路中，由于输入电压Vi和输出电压一定，相应的占空比D一定，那么，输出电流Io为大小与开关频率f和第一储能模块110的输出电流的峰值相关。因此，可通过电流调节模块130改变开关频率f和/或调节第一储能模块110的输出电流的峰值，来控制直流-直流转换电路的输出电流Io的大小。
下面参照图2至图5详细描述通过改变开关频率f和/或调节第一储能模块110的输出电流的峰值，来控制直流-直流转换电路的输出电流Io的大小的实施例。
图2示出图1的直流-直流转换电路的一个实施例的示意图。
参照图2，本实施例提供的直流-直流转换电路包括：第一储能模块110、第二储能模块120、电流调节模块130、电流侦测模块140。具体地，电流调节模块130包括第一控制器132和开关模块134。
图2示出的第一储能模块110、第二储能模块120、电流侦测模块140与图1中示出的相同，不再赘述。
开关模块134的一个连接端连接到第二储能模块120的输入端，开关模块134的另一个连接端接地，第一控制器132连接到开关模块134的控制端以控制开关模块134的开关频率。
第一控制器132接收所述反馈信号，并根据所述反馈信号控制开关模块134的开关频率，从而控制第一储能模块110的充放电时间，以调节第一储能模块110的输出电流的峰值。
这里，第一储能模块110的充放电时间周期与第一储能模块110的输出电流的峰值成正比。换言之，第一储能模块110的充放电时间增加，则第一储能模块110的输出电流的峰值升高；第一储能模块110的充放电时间减少，则第一储能模块110的输出电流的峰值降低；第一储能模块110的充放电时间不变，则第一储能模块110的输出电流的峰值不变。
应当理解，开关模块134的开关频率与第一储能模块110的充放电的频率相同，第一储能模块110的充放电的频率与充放电的时间周期成反比，由于占空比一定，那么，开关频率与在每个充放电的时间周期内充电的时间和放电的时间均成反比。在此情况下，当开关频率提高时，第一储能模块110的充放电的频率提高，那么第一储能模块110的充放电的时间减少，则第一储能模块110的输出电流的峰值降低；当开关频率降低时，第一储能模块110的充放电的频率降低，那么第一储能模块110的充放电的时间增加，则第一储能模块110的输出电流的峰值升高；当开关频率不变时，第一储能模块110的充放电的频率不变，那么第一储能模块110的充放电的时间不变，则第一储能模块110的输出电流的峰值不变。
下面详细描述在本实施例中改变开关频率以调节第一储能模块的输出电流的峰值，进而控制直流-直流转换电路的输出电流的大小的过程。
当第二储能模块120的输出电流的大小小于预定阈值时，电流侦测模块140输出第一反馈信号作为所述反馈信号；第一控制器132接收所述第一反馈信号，并根据所述第一反馈信号提高开关模块134的开关频率，从而控制第一储能模块110减少充放电时间，以降低第一储能模块110的输出电流的峰值。换言之，上述式(1)中开关频率f提高，导致第一储能模块输出电流的峰值 Ipk降低，使
Figure PCTCN2016098558-appb-000002
减小，从而减小直流-直流转换电路的输出电流Io的大小。
当第二储能模块120的输出电流的大小大于预定阈值时，电流侦测模块140输出第二反馈信号作为所述反馈信号；第一控制器132接收所述第二反馈信号，并根据所述第二反馈信号降低开关模块134的开关频率，从而控制第一储能模块110增加充放电时间，以升高第一储能模块110的输出电流的峰值。换言之，上述式(1)中开关频率f降低，导致第一储能模块输出电流的峰值Ipk升高，使
Figure PCTCN2016098558-appb-000003
增大，从而增大直流-直流转换电路的输出电流Io的大小。
当第二储能模块120的输出电流的大小等于预定阈值时，电流侦测模块140输出第三反馈信号作为所述反馈信号；第一控制器132接收所述第三反馈信号，并根据所述第三反馈信号控制开关模块134的开关频率保持不变，从而控制第一储能模块110的充放电时间保持不变，使第一储能模块110的输出电流的峰值的保持不变。换言之，上述式(1)中开关频率f不变，第一储能模块输出电流的峰值Ipk不变，从而直流-直流转换电路的输出电流Io的大小不变。
图3示出图1的直流-直流转换电路的另一实施例的示意图。
参照图3，本实施例提供的直流-直流转换电路包括：第一储能模块110、第二储能模块120、电流调节模块130、电流侦测模块140。具体地，电流调节模块130包括第二控制器136和限流模块137。
图3示出的第一储能模块110、第二储能模块120、电流侦测模块140与图1中示出的相同，不再赘述。
限流模块137连接在第一储能模块110与第二储能模块120之间；第二控制器136接收所述反馈信号，并根据所述反馈信号控制限流模块137调节第一储能模块110的输出电流的峰值。
限流模块137包括多个限流单元。不同的限流单元所能够通过的电流的峰值不同。换言之，第一储能模块110经由不同的限流单元能够输出的电流的峰 值不同。每个限流单元的一个连接端连接到第一储能模块110的输出端，所述每个限流单元的另一个连接端连接到第二储能模块120的输入端。
下面详细描述在本实施例中通过调节第一储能模块的输出电流的峰值，控制直流-直流转换电路的输出电流的大小的过程。
当第二储能模块120的输出电流的大小小于预定阈值时，电流侦测模块140输出第一反馈信号作为所述反馈信号；第二控制器136接收所述第一反馈信号，并根据所述第一反馈信号控制限流模块137降低第一储能模块110的输出电流的峰值。换言之，当输出电流的大小小于预定阈值时，所述第二控制器136开启比当前的限流单元所能够通过的电流的峰值低的限流单元，从而第一储能模块110经由该限流单元输出的电流的峰值降低，那么，上述式(1)中开关频率f不变，第一储能模块输出电流的峰值Ipk降低，从而减小直流-直流转换电路的输出电流Io的大小。
当第二储能模块120的输出电流的大小大于预定阈值时，电流侦测模块140输出第二反馈信号作为所述反馈信号；第二控制器136接收所述第二反馈信号，并根据所述第二反馈信号控制限流模块137升高第一储能模块110的输出电流的峰值。换言之，当输出电流的大小大于预定阈值时，所述第二控制器136开启比当前的限流单元所能够通过的电流的峰值高的限流单元，从而第一储能模块110经由该限流单元输出的电流的峰值升高，那么，上述式(1)中开关频率f不变，第一储能模块输出电流的峰值Ipk升高，从而增大直流-直流转换电路的输出电流Io的大小。
当第二储能模块120的输出电流的大小等于预定阈值时，电流侦测模块140输出第三反馈信号作为所述反馈信号；第二控制器136接收所述第三反馈信号，并根据所述第三反馈信号控制限流模块137保持第一储能模块110的输出电流的峰值不变。换言之，当输出电流的大小等于预定阈值时，所述第二控制器136保持当前的限流单元的开启，使第一储能模块110经由该限流单元输出的电流的峰值保持不变，那么，上述式(1)中开关频率f不变，第一储能模块输出电流的峰值Ipk不变，从而直流-直流转换电路的输出电流Io的大小保持不变。
图4示出图1的直流-直流转换电路的另一实施例的示意图。
参照图4，本实施例提供的直流-直流转换电路包括：第一储能模块110、第二储能模块120、电流调节模块130、电流侦测模块140。具体地，电流调节模块130包括第一控制器132、开关模块134、第二控制器136、限流模块137。
图4中示出的第一储能模块110、第二储能模块120、电流侦测模块140、第一控制器132、开关模块134、第二控制器136、限流模块137与图1至图3中示出的相同，不再赘述。
下面详细描述在本实施例中通过改变开关频率和调节第一储能模块的输出电流的峰值，控制直流-直流转换电路的输出电流的大小的过程。
当第二储能模块120的输出电流的大小小于预定阈值时，电流侦测模块140输出第一反馈信号作为所述反馈信号。第一控制器132接收所述第一反馈信号，并根据所述第一反馈信号提高开关模块134的开关频率，从而控制第一储能模块110减少充放电时间，以降低第一储能模块110的输出电流的峰值；第二控制器136接收所述第一反馈信号，并根据所述第一反馈信号开启比当前的限流单元所能够通过的电流的峰值低的限流单元，从而第一储能模块110经由该限流单元输出的电流的峰值降低。换言之，上述式(1)中开关频率f提高，导致第一储能模块输出电流的峰值Ipk降低，使
Figure PCTCN2016098558-appb-000004
减小，同时通过限流模块进一步降低第一储能模块输出电流的峰值Ipk，使
Figure PCTCN2016098558-appb-000005
进一步减小，从而减小直流-直流转换电路的输出电流Io的大小。
当第二储能模块120的输出电流的大小大于预定阈值时，电流侦测模块140输出第二反馈信号作为所述反馈信号。第一控制器132接收所述第二反馈信号，并根据所述第二反馈信号降低开关模块134的开关频率，从而控制第一储能模块110增加充放电时间，以升高第一储能模块110的输出电流的峰值；第二控制器136接收所述第二反馈信号，并根据所述第二反馈信号开启比当前的限流单元所能够通过的电流的峰值高的限流单元，从而第一储能模块110经由该限流单元输出的电流的峰值升高。换言之，上述式(1)中开关频率f降低，导致第一储能模块输出电流的峰值Ipk升高，使
Figure PCTCN2016098558-appb-000006
增大，同时通 过限流模块进一步升高第一储能模块输出电流的峰值Ipk，使
Figure PCTCN2016098558-appb-000007
进一步增大，从而增大直流-直流转换电路的输出电流Io的大小。
当第二储能模块120的输出电流的大小等于预定阈值时，电流侦测模块140输出第三反馈信号作为所述反馈信号。第一控制器132接收所述第三反馈信号，并根据所述第三反馈信号控制开关模块134的开关频率保持不变，从而控制第一储能模块110的充放电时间保持不变，使第一储能模块110的输出电流的峰值的保持不变；第二控制器136接收所述第三反馈信号，并根据所述第三反馈信号保持当前的限流单元的开启，使第一储能模块110经由该限流单元输出的电流的峰值保持不变。换言之，上述式(1)中开关频率f不变，第一储能模块输出电流的峰值Ipk不变，从而直流-直流转换电路的输出电流Io的大小保持不变。
图5示出图4的直流-直流转换电路的一个具体示例。
参照图5，第一储能模块110包括电感器L1，电感器L1的一端接收输入的直流电压。应当理解，本实施例中的第一储能模块仅是示例性的，还可通过其他的储能模块来实现。
第二储能模块120包括第一稳压二极管D1和电容器C1；第一稳压二极管D1的阳极连接到电感器L1的另一端，第一稳压二极管D1的阴极连接到电容器C1的一端，电容器C1的另一端接地。应当理解，本实施例中的第二储能模块仅是示例性的，还可通过其他的储能模块来实现。
开关模块134包括第一场效应晶体管Q1。优选地，第一场效应晶体管Q1为N沟道耗尽型场效应晶体管，第二控制器136连接到第一场效应晶体管Q1的栅极以控制第一场效应晶体管Q1导通或截止，第一场效应晶体管Q1的漏极连接到第一稳压二极管D1的阳极，第一场效应晶体管Q1的源极接地。应当理解，本实施例中的开关模块仅是示例性的，还可通过其他的开关模块来实现。
限流模块137包括多个限流单元138。下面详细描述任意一个限流单元138的基本结构。
限流单元138包括第二场效应晶体管Q2、第一电阻器R1、第二电阻器R2、 第一三极管T1、第二稳压二极管D2；第二控制器136连接到第二场效应晶体管Q2的栅极以控制第二场效应晶体管Q2导通或截止，第二场效应晶体管Q2的源极连接到电感器L1的另一端，第二场效应晶体管Q2的漏极连接到第二电阻器R2的一端和第一三极管T1的集电极，第二电阻器R2的另一端连接到第一三极管T1的基极和第二稳压二极管D2的阳极，第一三极管T1的发射极连接到第一电阻器R1的一端，第一电阻器R1的另一端连接到第二稳压二极管D2的阴极和第一稳压二极管D1的阳极。应当理解，本实施例中的限流单元仅是示例性的，还可通过其他的限流单元来实现。
应该理解，通过设置包括的元件的参数使得任意一个限流单元138所能够通过的电流的峰值不同。
采用上述根据本发明实施例的直流-直流转换电路，通过电流侦测模块检测第二储能模块的输出电流的大小并输出反馈信号，电流调节模块根据接收反馈信号调节第一储能模块的输出电流的峰值，进而实现控制输出电流的大小，有效提高转换电路的效率和稳定性。
上面已经结合具体实施例描述了本发明，但是本发明的实施不限于此。在本发明的精神和范围内，本领域技术人员可以进行各种修改和变型，这些修改和变型将落入权利要求限定的保护范围之内。

Claims (19)

  1. 一种直流-直流转换电路，其中，包括：第一储能模块、第二储能模块、电流调节模块、电流侦测模块；
    所述第一储能模块经由所述第二储能模块向外部输出电流；
    所述电流侦测模块检测所述第二储能模块的输出电流的大小，并根据检测的第二储能模块的输出电流的大小输出反馈信号；
    所述电流调节模块接收所述反馈信号，并根据所述反馈信号调节所述第一储能模块的输出电流的峰值。
  2. 如权利要求1所述的直流-直流转换电路，其中，所述电流调节模块包括第一控制器和开关模块，所述开关模块的一个连接端连接到所述第二储能模块的输入端，所述开关模块的另一个连接端接地；
    其中，所述第一控制器接收所述反馈信号，并根据所述反馈信号控制所述开关模块的开关频率，从而控制所述第一储能模块的充放电时间，以调节所述第一储能模块的输出电流的峰值。
  3. 如权利要求2所述的直流-直流转换电路，其中，当所述第二储能模块的输出电流的大小小于预定阈值时，所述电流侦测模块输出第一反馈信号作为所述反馈信号；
    所述第一控制器接收所述第一反馈信号，并根据所述第一反馈信号提高所述开关模块的开关频率，从而控制所述第一储能模块减少充放电时间，以降低所述第一储能模块的输出电流的峰值。
  4. 如权利要求2所述的直流-直流转换电路，其中，当所述第二储能模块的输出电流的大小大于预定阈值时，所述电流侦测模块输出第二反馈信号作为所述反馈信号；
    所述第一控制器接收所述第二反馈信号，并根据所述第二反馈信号降低所 述开关模块的开关频率，从而控制所述第一储能模块增加充放电时间，以升高所述第一储能模块的输出电流的峰值。
  5. 如权利要求2所述的直流-直流转换电路，其中，当所述第二储能模块的输出电流的大小等于预定阈值时，所述电流侦测模块输出第三反馈信号作为所述反馈信号；
    所述第一控制器接收所述第三反馈信号，并根据所述第三反馈信号控制所述开关模块的开关频率保持不变，从而控制所述第一储能模块的充放电时间保持不变，使所述第一储能模块的输出电流的峰值的保持不变。
  6. 如权利要求1所述的直流-直流转换电路，其中，所述电流调节模块包括第二控制器和限流模块，所述限流模块连接在所述第一储能模块与所述第二储能模块之间；
    其中，所述第二控制器接收所述反馈信号，并根据所述反馈信号控制所述限流模块调节所述第一储能模块的输出电流的峰值。
  7. 如权利要求2所述的直流-直流转换电路，其中，所述电流调节模块包括第二控制器和限流模块，所述限流模块连接在所述第一储能模块与所述第二储能模块之间；
    其中，所述第二控制器接收所述反馈信号，并根据所述反馈信号控制所述限流模块调节所述第一储能模块的输出电流的峰值。
  8. 如权利要求6所述的直流-直流转换电路，其中，当所述第二储能模块的输出电流的大小小于预定阈值时，所述电流侦测模块输出第一反馈信号作为所述反馈信号；
    所述第二控制器接收所述第一反馈信号，并根据所述第一反馈信号控制所述限流模块降低所述第一储能模块的输出电流的峰值。
  9. 如权利要求7所述的直流-直流转换电路，其中，当所述第二储能模块的输出电流的大小小于预定阈值时，所述电流侦测模块输出第一反馈信号作为所述反馈信号；
    所述第二控制器接收所述第一反馈信号，并根据所述第一反馈信号控制所述限流模块降低所述第一储能模块的输出电流的峰值。
  10. 如权利要求6所述的直流-直流转换电路，其中，当所述第二储能模块的输出电流的大小大于预定阈值时，所述电流侦测模块输出第二反馈信号作为所述反馈信号；
    所述第二控制器接收所述第二反馈信号，并根据所述第二反馈信号控制所述限流模块升高所述第一储能模块的输出电流的峰值。
  11. 如权利要求7所述的直流-直流转换电路，其中，当所述第二储能模块的输出电流的大小大于预定阈值时，所述电流侦测模块输出第二反馈信号作为所述反馈信号；
    所述第二控制器接收所述第二反馈信号，并根据所述第二反馈信号控制所述限流模块升高所述第一储能模块的输出电流的峰值。
  12. 如权利要求6所述的直流-直流转换电路，其中，当所述第二储能模块的输出电流的大小等于预定阈值时，所述电流侦测模块输出第三反馈信号作为所述反馈信号；
    所述第二控制器接收所述第三反馈信号，并根据所述第三反馈信号控制所述限流模块保持所述第一储能模块的输出电流的峰值不变。
  13. 如权利要求7所述的直流-直流转换电路，其中，当所述第二储能模块的输出电流的大小等于预定阈值时，所述电流侦测模块输出第三反馈信号作为所述反馈信号；
    所述第二控制器接收所述第三反馈信号，并根据所述第三反馈信号控制所述限流模块保持所述第一储能模块的输出电流的峰值不变。
  14. 如权利要求1所述的直流-直流转换电路，其中，所述第二储能模块包括第一稳压二极管和电容器，
    所述第一稳压二极管的阳极连接到所述第一储能模块的输出端，所述第一稳压二极管的阴极连接到电容器的一端，所述电容器的另一端接地。
  15. 如权利要求6所述的直流-直流转换电路，其中，所述限流模块包括多个限流单元，所述第二控制器根据所述反馈信号开启所述多个限流单元中的一个，关闭其余的限流单元，以调节所述第一储能模块的输出电流的峰值；不同的限流单元所能够通过的电流的峰值不同；
    每个限流单元的一个连接端连接到第一储能模块的输出端，所述每个限流单元的另一个连接端连接到所述第二储能模块的输入端。
  16. 如权利要求7所述的直流-直流转换电路，其中，所述限流模块包括多个限流单元，所述第二控制器根据所述反馈信号开启所述多个限流单元中的一个，关闭其余的限流单元，以调节所述第一储能模块的输出电流的峰值；不同的限流单元所能够通过的电流的峰值不同；
    每个限流单元的一个连接端连接到第一储能模块的输出端，所述每个限流单元的另一个连接端连接到所述第二储能模块的输入端。
  17. 如权利要求15所述的直流-直流转换电路，其中，任意一个限流单元包括第二场效应晶体管、第一电阻器、第二电阻器、三极管、第二稳压二极管，
    第二控制器连接到所述第二场效应晶体管的栅极以控制所述第二场效应晶体管导通或截止，所述第二场效应晶体管的源极连接到所述第一储能模块的输出端，所述第二场效应晶体管的漏极连接到所述第二电阻器的一端和三极管的集电极，所述第二电阻器的另一端连接到所述三极管的基极和第二稳压二极管的阳极，所述三极管的发射极连接到所述第一电阻器的一端，所述第一电阻器的另一端连接到所述第二稳压二极管的阴极和第二储能模块的输入端。
  18. 如权利要求16所述的直流-直流转换电路，其中，任意一个限流单元包括第二场效应晶体管、第一电阻器、第二电阻器、三极管、第二稳压二极管，
    第二控制器连接到所述第二场效应晶体管的栅极以控制所述第二场效应晶体管导通或截止，所述第二场效应晶体管的源极连接到所述第一储能模块的输出端，所述第二场效应晶体管的漏极连接到所述第二电阻器的一端和三极管的集电极，所述第二电阻器的另一端连接到所述三极管的基极和第二稳压二极管的阳极，所述三极管的发射极连接到所述第一电阻器的一端，所述第一电阻 器的另一端连接到所述第二稳压二极管的阴极和第二储能模块的输入端。
  19. 一种液晶显示器，包括直流-直流转换电路，其中，所述直流-直流转换电路包括：第一储能模块、第二储能模块、电流调节模块、电流侦测模块；
    所述第一储能模块经由所述第二储能模块向外部输出电流；
    所述电流侦测模块检测所述第二储能模块的输出电流的大小，并根据检测的第二储能模块的输出电流的大小输出反馈信号；
    所述电流调节模块接收所述反馈信号，并根据所述反馈信号调节所述第一储能模块的输出电流的峰值。
PCT/CN2016/098558 2016-07-02 2016-09-09 直流-直流转换电路以及液晶显示器 Ceased WO2018006492A1 (zh)

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