Buck-boost control circuit and display device

Abstract

The invention discloses a buck-boost control circuit and a display device. The buck-boost control circuit comprises a charging and discharging control module, an energy storage module and an output module, the charging and discharging control module is connected with the energy storage module and is used for performing charging and discharging control on the energy storage module according to the accessed power supply; the energy storage module is connected between the charging and discharging control module and the output module and is used for supplying power to a load through the output module. Wherein the energy storage module comprises a plurality of energy storage units, and the charge and discharge control module is used for carrying out alternate charge and discharge control on the plurality of energy storage units according to an input charge and discharge control signal. The charging and discharging process can be more uniform, and the output stability of the buck-boost circuit is improved.

Description

Technical Field

[0001] This application relates to the field of display technology, and particularly to a buck-boost control circuit and a display device. Background Art

[0002] The interior of a display device has various components and modules, such as a backlight module, a display panel, a driving chip, etc. These components and modules may require different voltages to drive. Additionally, the display device may also have different working modes, such as an on mode, an off mode, and a sleep mode, etc. The voltage needs to be dynamically adjusted in these working modes to optimize power consumption and performance. Moreover, the power input of the display device is diverse, so the input voltage may be higher or lower than the required output voltage. Based on this, a buck-boost control circuit capable of adjusting the voltage plays an important role in the display device. How to improve the output stability of the buck-boost control circuit is a topic that the industry has been committed to researching. Summary of the Invention

[0003] Embodiments of this application provide a buck-boost control circuit and a display device, which can make the charge and discharge process more uniform and improve the output stability of the buck-boost circuit.

[0004] In a first aspect, embodiments of this application provide a buck-boost control circuit. The buck-boost control circuit includes: a charge and discharge control module, an energy storage module, and an output module; the charge and discharge control module is connected to the energy storage module and is used to control the charge and discharge of the energy storage module according to the accessed power supply; the energy storage module is connected between the charge and discharge control module and the output module and is used to supply power to a load through the output module; wherein, the energy storage module includes a plurality of energy storage units, and the charge and discharge control module is used to alternately control the charge and discharge of the plurality of energy storage units according to the input charge and discharge control signals.

[0005] Optionally, the charge and discharge control module includes a control switch and at least one energy storage switch; wherein, the control switch includes a first electrode connected to the power supply, a second electrode connected to the first end of the energy storage unit, and a control electrode for accessing a first control signal; the energy storage switch includes a first electrode connected to the second end of the energy storage unit, a second electrode grounded, and a control electrode for accessing a second control signal; wherein, the charge and discharge control signal includes the first control signal and the second control signal.

[0006] Optionally, the energy storage module includes a first energy storage unit and a second energy storage unit, and the at least one energy storage switch includes a first energy storage switch and a second energy storage switch corresponding to the first energy storage unit and the second energy storage unit respectively; the first energy storage switch includes a first electrode connected to the second end of the first energy storage unit, a second electrode grounded, and a control electrode for accessing the second control signal; the second energy storage switch includes a first electrode connected to the second end of the second energy storage unit, a second electrode grounded, and a control electrode for accessing the second control signal.

[0007] Optionally, both the first energy storage switch and the second energy storage switch are NMOS switch tubes or PMOS switch tubes, and the phases of the second control signals respectively accessed by the first energy storage switch and the second energy storage switch are opposite.

[0008] Optionally, the first energy storage switch is an NMOS switch tube, and the second energy storage switch tube is a PMOS switch tube; the phases of the second control signals respectively accessed by the first energy storage switch and the second energy storage switch are the same.

[0009] Optionally, the charge-discharge control module further includes a first capacitor; wherein, the first capacitor includes a first end connected to the power supply and a second end grounded.

[0010] Optionally, the energy storage unit includes an inductor.

[0011] Optionally, the energy storage module includes a first energy storage unit and a second energy storage unit, the first energy storage unit includes a first inductor, and the second energy storage unit includes a second inductor.

[0012] Optionally, the output module includes a diode and a second capacitor; wherein, the diode includes a negative electrode connected to the first end of the energy storage unit and a positive electrode connected to the first end of the second capacitor; the second capacitor includes a first end connected to the positive electrode of the diode and a second end grounded.

[0013] In a second aspect, an embodiment of the present application provides a display device, and the display device includes the buck-boost control circuit as described above.

[0014] In summary, in the embodiments of the present application, through the alternating charge and discharge control of multiple energy storage units, multiple energy storage units can supply power to the load, thereby reducing the peak current of a single energy storage unit, reducing voltage ripple, making the charge and discharge process more uniform, and improving the output stability of the buck-boost circuit. Moreover, in the embodiments of the present application, the energy storage unit can include an inductor, and different energy storage units can use inductors with different inductance values, so that the appropriate energy storage unit can be flexibly selected for charge and discharge control according to different load conditions, which helps to achieve the best energy conversion efficiency for different load conditions. In addition, in the embodiments of the present application, through the alternating charge and discharge of multiple energy storage units, to ensure the output remains unchanged, the internal resistance of a single energy storage unit can be reduced. For example, the inductance value of the inductor in the energy storage unit can be reduced. The smaller the inductance value, the smaller the internal resistance, so the heat loss of the energy storage unit is reduced, and the charge and discharge efficiency can be improved while ensuring the output remains unchanged. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic diagram of a buck-boost control circuit;

[0016] Figure 2 is Figure 1 a schematic diagram of a current flow direction of the buck-boost control circuit shown;

[0017] Figure 3 is Figure 1 a schematic diagram of another current flow direction of the buck-boost control circuit shown;

[0018] Figure 4 is Figure 1 a schematic diagram of a charge and discharge current waveform of the buck-boost control circuit shown;

[0019] Figure 5 is a schematic diagram of a buck-boost control circuit provided by an embodiment of the present application;

[0020] Figure 6 is a schematic diagram of another buck-boost control circuit provided by an embodiment of the present application;

[0021] Figure 7 is Figure 6 a schematic diagram of a current flow direction during the charging process of the buck-boost control circuit shown;

[0022] Figure 8 is Figure 6 a schematic diagram of another current flow direction during the charging process of the buck-boost control circuit shown;

[0023] Figure 9 is Figure 6 a schematic diagram of a current flow direction during the discharging process of the buck-boost control circuit shown;

[0024] Figure 10 is Figure 6 a schematic diagram of another current flow direction during the discharge process of the buck-boost control circuit shown;

[0025] Figure 11 is Figure 6 a schematic diagram of a charge-discharge current waveform of the buck-boost control circuit shown;

[0026] Figure 12 is Figure 6 a schematic diagram of another charge-discharge current waveform of the buck-boost control circuit shown. Specific embodiments

[0027] Next, the technical solutions in the embodiments of the present application will be described with reference to the accompanying drawings in the embodiments of the present application. The described technical solutions are only used to explain and illustrate the idea of the present application, and should not be regarded as a limitation on the protection scope of the present application.

[0028] In addition, "a plurality of" in the embodiments of the present application refers to two or more. "First" and "second" in the embodiments of the present application are used to distinguish different technical features, and do not represent any order, quantity, or importance.

[0029] The various embodiments provided by the present application are similar, and the features in different embodiments can be combined with each other.

[0030] The description order of the following embodiments is not used as a limitation on the preferred order of the embodiments.

[0031] Please refer to Figure 1 , Figure 1 which is a schematic diagram of a buck-boost control circuit. As Figure 1 shown, the buck-boost control circuit includes an input capacitor CIN, a switching transistor Q1, an inductor L1, a diode D1, and an output capacitor COUT.

[0032] Among them, the input capacitor CIN includes a first end connected to a power supply S1 and a second end grounded; the switching transistor Q1 includes a first electrode connected to the first end of the input capacitor CIN, a second electrode connected to the first end of the inductor L1, and a control electrode connected to a charge-discharge control signal; the inductor L1 includes a first end connected to the second electrode of the switching transistor Q1 and a second end grounded; the diode D1 includes a negative electrode connected to the first end of the inductor L1 and a positive electrode connected to the first end of the output capacitor COUT; the output capacitor COUT includes a first end connected to the positive electrode of the diode D1 and a second end grounded. In addition, both ends of the output capacitor COUT are connected to a load RL to supply power to the load.

[0033] Figure 2 is Figure 1A schematic diagram of the current flow of the buck-boost control circuit shown Figure 3 is Figure 1 A schematic diagram of another current flow of the buck-boost control circuit shown. The switching transistor Q1 can control the charging and discharging of the inductor L1 according to the access charge and discharge control signal. As Figure 2 shown, when the switching transistor Q1 is turned on, the current of the power supply S1 can flow through the inductor L1 to charge the inductor L1. As Figure 3 shown, when the switching transistor Q1 is turned off, the inductor L1 discharges, and the discharge current of the inductor L1 can flow through the load RL to supply power to the load RL.

[0034] It should be understood that the first electrode of the switching transistor Q1 can be one of the source and the drain, the second electrode can be the other of the source and the drain, and the control electrode can be the gate. Optionally, the switching transistor Q1 can be an NMOS (N-Metal-Oxide-Semiconductor) transistor or a PMOS (P-Metal-Oxide-Semiconductor) transistor. The charge and discharge control signal can include a low potential and a high potential to control the conduction and cut-off of the switching transistor Q1. When the switching transistor Q1 is an NMOS switching transistor, the switching transistor Q1 is turned on when a high potential is applied to the control electrode and turned off when a low potential is applied to the control electrode. When the switching transistor Q1 is a PMOS switching transistor, the switching transistor Q1 is turned on when a low potential is applied to the control electrode and turned off when a high potential is applied to the control electrode. Figure 2 Taking the switching transistor Q1 as a PMOS switching transistor as an example, this does not limit the present application.

[0035] Figure 4 is Figure 1 A schematic diagram of a charge and discharge current waveform of the buck-boost control circuit shown. The charge and discharge current can be the charge and discharge current flowing through the inductor L1. According to the basic formula of the inductor U = L * di / dt, it can be known that Figure 4 the slope K = di / dt = U / L of the charge and discharge current waveform shown, and this slope di / dt has a positive correlation with the voltage. Wherein, U is the voltage and L is the inductance value of the inductor L1.

[0036] From Figure 4 it can be seen that to achieve the required output, the charging and discharging time of the inductor L1 is relatively long and the voltage ripple is relatively large, which is not conducive to the stability of the output. In view of this, the embodiments of the present application provide a buck-boost control circuit and a display device.

[0037] Please refer to Figure 5 , Figure 5 is a schematic diagram of a buck-boost control circuit provided by an embodiment of the present application. As Figure 5As shown in the figure, the buck-boost control circuit includes: a charge-discharge control module 100, an energy storage module 200, and an output module 300.

[0038] The charge-discharge control module 100 is connected to the energy storage module 200 and is used to control the charge and discharge of the energy storage module 200 according to the connected power supply S1. The energy storage module 200 is connected between the charge-discharge control module 100 and the output module 300 and is used to supply power to the load RL through the output module 300. In the embodiment of the present application, the load is taken as a resistor as an example, but this does not constitute a limitation to the present application. In practical applications, the load can also be a light-emitting device, a capacitor, an inductor, a sensor, a controller, a processor, etc.

[0039] The charge-discharge control module 100 can also receive a charge-discharge control signal. The charge-discharge control signal is used to control the conduction or cut-off of the charge-discharge control module 100. When the current loop of the charge-discharge control module 100 is conducting, the current provided by the power supply S1 can flow through the energy storage unit 210 in the energy storage module 200, so that the energy storage unit 210 can be charged. When the current loop of the charge-discharge control module 100 is cut off, the current provided by the power supply S1 no longer flows through the energy storage module 200, and the energy storage unit 210 in the energy storage module 200 can discharge to supply power to the load RL.

[0040] Among them, the energy storage module 200 includes a plurality of energy storage units 210, and the charge-discharge control module 100 is used to alternately control the charge and discharge of the plurality of energy storage units 210 according to the input charge-discharge control signal. The alternate charge-discharge control includes but is not limited to at least one of the following: the alternation of the charging process and the discharging process of a single energy storage unit 210, the alternation of the charging processes of a plurality of energy storage units 210, and the alternation of the discharging processes of a plurality of energy storage units 210. For example, taking the plurality of energy storage units 210 of the energy storage module 200 including a first energy storage unit and a second energy storage unit as an example, the alternate charge-discharge control of the plurality of energy storage units 210 may sequentially include the following processes: the first energy storage unit is charged, the first energy storage unit is discharged, the second energy storage unit is charged, the second energy storage unit is discharged; or may sequentially include the following processes: the first energy storage unit is charged, the second energy storage unit is charged, the first energy storage unit is discharged, the second energy storage unit is discharged; or may sequentially include the following processes: the first energy storage unit is charged, the second energy storage unit is charged, the second energy storage unit is discharged, the first energy storage unit is discharged. Of course, in practical applications, the energy storage module 200 may also include three, four or more energy storage units 210, and these should all fall within the protection scope of the present application.

[0041] In some embodiments, the charge and discharge control module 100 includes a control switch 110 and at least one energy storage switch 120. Among them, the control switch 110 includes a first electrode connected to the power supply S1, a second electrode connected to the first end of the energy storage unit 210, and a control electrode for accessing a first control signal; the energy storage switch 120 includes a first electrode connected to the second end of the energy storage unit 210, a second electrode grounded, and a control electrode for accessing a second control signal. Among them, the charge and discharge control signal includes a first control signal and a second control signal. The first control signal is used to control the conduction or cutoff of the control switch 110, and the second control signal is used to control the conduction or cutoff of the energy storage switch 120. Based on the control switch 110, the energy storage module 200 can be controlled to charge or discharge; based on the energy storage switch 120, the charging or discharging of the energy storage unit 210 corresponding to the energy storage switch 120 in the energy storage module 200 can be controlled. Optionally, the charge and discharge control module 100 includes one or more control switches 110 and one or more energy storage switches 120. The embodiments of the present application do not limit the number of the control switches 110 and the energy storage switches 120, and can be flexibly set according to requirements in actual applications. In some embodiments, the energy storage unit 210 may be provided with a corresponding energy storage switch 120 or may not be provided with a corresponding energy storage switch 120. When the energy storage unit 210 is provided with a corresponding energy storage switch 120, the first end of the energy storage unit 210 is connected to the second electrode of the control switch 110, and the second end is connected to the first electrode of the energy storage switch 120. When the energy storage unit 210 is not provided with a corresponding energy storage switch 120, the first end of the energy storage unit 210 is connected to the second electrode of the control switch 110, and the second end is grounded.

[0042] In the embodiments of the present application, the types of the control switch 110 and the energy storage switch 120 are not limited, and can be flexibly set according to requirements in practical applications. The above-mentioned first electrode can be one of the source electrode and the drain electrode, the second electrode can be the other of the source electrode and the drain electrode, and the control electrode can be the gate electrode. Optionally, the control switch 110 can be an NMOS switch tube or a PMOS switch tube; the energy storage switch 120 can be an NMOS switch tube or a PMOS switch tube; the types of the control switch 110 and the energy storage switch 120 can be the same or different. The first control signal can include two phase states of low potential and high potential to control the on and off of the control switch 110; when the control switch 110 is an NMOS switch tube, the control switch 110 is turned on when a high potential is applied to the control electrode and turned off when a low potential is applied to the control electrode; when the control switch 110 is a PMOS switch tube, the control switch 110 is turned on when a low potential is applied to the control electrode and turned off when a high potential is applied to the control electrode. The second control signal can include two phase states of low potential and high potential to control the on and off of the energy storage switch 120; when the energy storage switch 120 is an NMOS switch tube, the energy storage switch 120 is turned on when a high potential is applied to the control electrode and turned off when a low potential is applied to the control electrode; when the energy storage switch 120 is a PMOS switch tube, the energy storage switch 120 is turned on when a low potential is applied to the control electrode and turned off when a high potential is applied to the control electrode.

[0043] In some embodiments, the energy storage module 200 includes a first energy storage unit and a second energy storage unit, and at least one energy storage switch 120 includes a first energy storage switch and a second energy storage switch corresponding to the first energy storage unit and the second energy storage unit respectively. The first energy storage switch includes a first electrode connected to the second end of the first energy storage unit, a second electrode grounded, and a control electrode for accessing the second control signal. The second energy storage switch includes a first electrode connected to the second end of the second energy storage unit, a second electrode grounded, and a control electrode for accessing the second control signal.

[0044] To achieve the alternating charge and discharge control of the first energy storage unit and the second energy storage unit, during the conduction time of the first energy storage switch, the second energy storage switch can be maintained in the off state, and during the conduction period of the second energy storage switch, the first energy storage switch can be maintained in the off state. Optionally, both the first energy storage switch and the second energy storage switch are NMOS switch tubes or PMOS switch tubes. Thus, the conduction conditions and the off conditions of the first energy storage switch and the second energy storage switch are the same. To achieve the alternating charge and discharge control of the first energy storage unit and the second energy storage unit, the phases of the second control signals respectively connected to the first energy storage switch and the second energy storage switch are opposite. For example, the second control signal connected to the first energy storage switch is different from the second control signal connected to the second energy storage switch. When the second control signal connected to the first energy storage switch is at a high potential, the second control signal connected to the second energy storage switch is at a low potential; when the second control signal connected to the first energy storage switch is at a low potential, the second control signal connected to the second energy storage switch is at a high potential. Optionally, the first energy storage switch is one of an NMOS switch tube and a PMOS switch tube, and the second energy storage switch is the other of an NMOS switch tube and a PMOS switch tube. For example, if the first energy storage switch is an NMOS switch tube and the second energy storage switch is a PMOS switch tube, to achieve the alternating charge and discharge control of the first energy storage unit and the second energy storage unit, the phases of the second control signals respectively connected to the first energy storage switch and the second energy storage switch are the same. For example, the first energy storage switch and the second energy storage switch can be connected to the same second control signal.

[0045] In some embodiments, the charge and discharge control module 100 further includes a first capacitor. Wherein, the first capacitor includes a first end connected to a power supply and a second end grounded. This first capacitor can be used to stabilize the output voltage of the power supply. When the current loop of the charge and discharge control module 100 is turned off, the current of the power supply can flow through the first capacitor.

[0046] In some embodiments, the output module 300 includes a diode and a second capacitor. Wherein, the diode includes a negative electrode connected to the first end of the energy storage unit and a positive electrode connected to the first end of the second capacitor; the second capacitor includes a first end connected to the positive electrode of the diode and a second end grounded. When the current loop of the charge and discharge control module 100 is turned on, due to the unidirectional conduction characteristic of the diode, the current of the power supply S1 will not flow through the diode; when the current loop of the charge and discharge control module 100 is turned off, the current of the energy storage module 200 can flow through the diode to form a current loop to realize the power supply to the load RL.

[0047] In some embodiments, the energy storage unit 210 includes an inductor. One energy storage unit 210 may include one or more inductors, and the embodiments of the present application do not limit this. Optionally, the energy storage module 200 includes a first energy storage unit and a second energy storage unit. The first energy storage unit includes a first inductor, and the second energy storage unit includes a second inductor. The inductance value of the first inductor and the inductance value of the second inductor may be the same or different. When the inductance values of the first inductor and the second inductor are different, the buck-boost control circuit can be flexibly adapted to different load conditions. For example, for a heavy load condition, the energy storage unit with the inductor having a larger inductance value can be used to supply power to the load; for a light load condition, the energy storage unit with the inductor having a smaller inductance value can be used to supply power to the load.

[0048] In summary, the buck-boost control circuit provided by the embodiments of the present application includes a charge and discharge control module, an energy storage module, and an output module. The energy storage module is connected between the charge and discharge control module and the output module and is used to supply power to the load. Among them, the energy storage module includes a plurality of energy storage units, and the charge and discharge control module can perform alternating charge and discharge control on the plurality of energy storage units according to the charge and discharge control signal. Through the alternating charge and discharge control of the plurality of energy storage units in the embodiments of the present application, the plurality of energy storage units can supply power to the load, thereby reducing the peak current of a single energy storage unit, reducing the voltage ripple, making the charge and discharge process more uniform, and improving the output stability of the buck-boost circuit. Moreover, in the embodiments of the present application, the energy storage unit may include an inductor, and different energy storage units may use inductors with different inductance values, so that the energy storage unit suitable for charging and discharging can be flexibly selected according to different load conditions, which helps to achieve the best energy conversion efficiency for different load conditions. In addition, through the alternating charge and discharge of the plurality of energy storage units in the embodiments of the present application, in order to ensure that the output remains unchanged, the internal resistance of a single energy storage unit can be reduced. For example, the inductance value of the inductor in the energy storage unit is reduced. The smaller the inductance value, the smaller the internal resistance, so that the heat loss of the energy storage unit is reduced, and the charge and discharge efficiency can be improved while ensuring that the output remains unchanged.

[0049] Correspondingly, the embodiments of the present application also provide a display device, which may include the above buck-boost control circuit. In some embodiments, the display device provided by the embodiments of the present application includes, but is not limited to: AMOLED (Active Matrix Organic Light Emitting Diode) displays, Micro LED (Micro Light Emitting Diode) displays, Mini Led (Miniature Light Emitting Diode) displays, etc.

[0050] For a detailed introduction to the module structure, connection relationship, and beneficial efficiency of the buck-boost control circuit in the display device, please refer to the above embodiments and will not be elaborated here.

[0051] Next, some examples will be used to introduce the buck-boost control circuit provided in the embodiments of the present application.

[0052] Please refer to Figure 6 , Figure 6 which is a schematic diagram of another buck-boost control circuit provided in the embodiments of the present application. As Figure 6 shown, the buck-boost control circuit includes: a charge and discharge control module 100, an energy storage module 200, and an output module 300.

[0053] Among them, the charge and discharge control module 100 includes a first capacitor CIN, a control switch Q1, a first energy storage switch Q2, and a second energy storage switch Q3; the energy storage module 200 includes a first energy storage unit and a second energy storage unit. The first energy storage unit includes a first inductor L1, and the second energy storage unit includes a second inductor L2; the output module 300 includes a diode D1 and a second capacitor COUT. The first capacitor CIN includes a first end connected to the power supply S1 and a second end grounded. The control switch Q1 includes a first electrode connected to the power supply S1, a second electrode connected to the first end of the first inductor L1 and the first end of the second inductor L2, and a control electrode for accessing a first control signal. The first inductor L1 includes a first end connected to the second electrode of the control switch Q1 and a second end connected to the first energy storage switch Q2. The first energy storage switch Q2 includes a first electrode connected to the second end of the first inductor L1, a second electrode grounded, and a control electrode for accessing a second control signal. The second inductor L2 includes a first end connected to the second electrode of the control switch Q1 and a second end connected to the second energy storage switch Q3. The second energy storage switch Q3 includes a first electrode connected to the second end of the second inductor L2, a second electrode grounded, and a control electrode for accessing a second control signal. The diode D1 includes a negative electrode connected to the first end of the first inductor L1 and the first end of the second inductor L2, and a positive electrode connected to the first end of the second capacitor COUT. The second capacitor COUT includes a first end connected to the positive electrode of the diode D1 and a second end grounded.

[0054] The control switch Q1 can control the charging and discharging of the first inductor L1 and the second inductor L2 according to the first control signal applied. The first energy storage switch Q2 can control the charging and discharging of the first inductor L1 according to the second control signal applied, and the second energy storage switch Q3 can control the charging and discharging of the second inductor L2 according to the second control signal applied. Among them, the phases of the second control signals respectively applied to the first energy storage switch Q2 and the second energy storage switch Q3 are the same or opposite, and can be flexibly determined according to the types of the first energy storage switch Q2 and the second energy storage switch Q3 in practical applications.

[0055] Figure 7 is Figure 6 A schematic diagram of a current flow direction during the charging process of the buck-boost control circuit shown. As Figure 7 shown, when the control switch Q1 and the first energy storage switch Q2 are turned on and the second energy storage switch Q3 is turned off, the current of the power supply S1 can flow through the first inductor L1 to charge the first inductor L1. Figure 8 is Figure 6 Another schematic diagram of a current flow direction during the charging process of the buck-boost control circuit shown. As Figure 8 shown, when the control switch Q1 and the second energy storage switch Q3 are turned on and the first energy storage switch Q2 is turned off, the current of the power supply S1 can flow through the second inductor L2 to charge the second inductor L2.

[0056] Figure 9 is Figure 6 A schematic diagram of a current flow direction during the discharging process of the buck-boost control circuit shown. As Figure 9 shown, when the control switch Q1 and the first energy storage switch Q2 are turned off and the second energy storage switch Q3 is turned on, the second inductor L2 discharges, and the discharge current of the second inductor L2 can flow through the load RL to supply power to the load RL. Figure 10 is Figure 6 Another schematic diagram of a current flow direction during the discharging process of the buck-boost control circuit shown. As Figure 10 shown, when the control switch Q1 and the second energy storage switch Q3 are turned off and the first energy storage switch Q2 is turned on, the first inductor L1 discharges, and the discharge current of the first inductor L1 can flow through the load RL to supply power to the load RL.

[0057] Figure 11 is Figure 6 A schematic diagram of a charge-discharge current waveform of the buck-boost control circuit shown. If Figure 6 the inductance values of the first inductor L1 and the second inductor L2 in the buck-boost control circuit shown, are the same as the inductance value of the inductor L1 in the buck-boost control circuit shown in Figure 1 and the parameters of other devices in the two buck-boost control circuits are also the same, then as Figure 4and Figure 11 As shown, based on Figure 6 the buck-boost control circuit shown, the peak currents of the first inductor L1 and the second inductor L2 can be reduced, thereby reducing the voltage ripple, making the charging and discharging process more uniform, and achieving fast response and stable output for the load RL.

[0058] Figure 12 is Figure 6 a schematic diagram of another charging and discharging current waveform of the buck-boost control circuit shown. If Figure 6 the inductance values of the first inductor L1 and the second inductor L2 in the buck-boost control circuit shown are half of the inductance value of the inductor L1 in the buck-boost control circuit shown, and the parameters of other devices in the two buck-boost control circuits are the same, then as Figure 1 shown, based on Figure 4 and Figure 12 the buck-boost control circuit shown, the slope of the current ripple during the charging and discharging process can be increased under the same input and output. When Figure 6 the inductance values of the first inductor L1 and the second inductor L2 in the buck-boost control circuit shown are small, the internal resistance of the inductor is small, so the inductance heat loss is reduced, which can ensure the improvement of the charging and discharging efficiency under the same input and output. Figure 6 In addition, in the buck-boost control circuit shown

[0059] In addition, Figure 6 in the buck-boost control circuit shown, the inductance value of the first inductor L1 can be set to a relatively large value, and the inductance value of the second inductor L2 can be set to a relatively small value. Thus, in the case of heavy load, the load RL is large, and the first inductor L1 can be selected for charging and discharging control to supply power to the load RL; in the case of light load, the load RL is small, and the second inductor L2 can be selected for charging and discharging control to supply power to the load RL. Figure 6 The buck-boost control circuit shown can select the best application configuration according to the load situation, and achieve the best energy conversion efficiency under different load conditions.

[0060] The above has introduced in detail a buck-boost control circuit and a display device provided in an embodiment of the present application. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application; at the same time, for those skilled in the art, according to the idea of the present application, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. A buck-boost control circuit, characterized in that, The buck-boost control circuit includes: a charge and discharge control module, an energy storage module, and an output module; The charge and discharge control module is connected to the energy storage module and is used to control the charge and discharge of the energy storage module according to the accessed power supply; The energy storage module is connected between the charge and discharge control module and the output module and is used to supply power to a load through the output module; Wherein, the energy storage module includes a plurality of energy storage units, and the charge and discharge control module is used to alternately control the charge and discharge of the plurality of energy storage units according to the input charge and discharge control signal.

2. The buck-boost control circuit according to claim 1, wherein The charge and discharge control module includes a control switch and at least one energy storage switch; wherein, The control switch includes a first electrode connected to the power supply, a second electrode connected to the first end of the energy storage unit, and a control electrode for accessing a first control signal; The energy storage switch includes a first electrode connected to the second end of the energy storage unit, a second electrode grounded, and a control electrode for accessing a second control signal; Wherein, the charge and discharge control signal includes the first control signal and the second control signal.

3. The buck-boost control circuit according to claim 2, wherein The energy storage module includes a first energy storage unit and a second energy storage unit, and the at least one energy storage switch includes a first energy storage switch and a second energy storage switch corresponding to the first energy storage unit and the second energy storage unit respectively; The first energy storage switch includes a first electrode connected to the second end of the first energy storage unit, a second electrode grounded, and a control electrode for accessing the second control signal; The second energy storage switch includes a first electrode connected to the second end of the second energy storage unit, a second electrode grounded, and a control electrode for accessing the second control signal.

4. The buck-boost control circuit according to claim 3, wherein Both the first energy storage switch and the second energy storage switch are NMOS switch tubes or PMOS switch tubes, and the phases of the second control signals respectively accessed by the first energy storage switch and the second energy storage switch are opposite.

5. The buck-boost control circuit according to claim 3, wherein The first energy storage switch is an NMOS switch tube, and the second energy storage switch tube is a PMOS switch tube; the phases of the second control signals respectively accessed by the first energy storage switch and the second energy storage switch are the same.

6. The buck-boost control circuit according to claim 2, wherein The charge and discharge control module further includes a first capacitor; wherein, The first capacitor includes a first end connected to the power supply and a second end grounded.

7. The buck-boost control circuit according to claim 1, wherein The energy storage unit includes an inductor.

8. The buck-boost control circuit according to claim 7, wherein The energy storage module includes a first energy storage unit and a second energy storage unit, the first energy storage unit includes a first inductor, and the second energy storage unit includes a second inductor.

9. The buck-boost control circuit according to claim 1, wherein The output module includes a diode and a second capacitor; wherein, The diode includes a negative electrode connected to the first end of the energy storage unit and a positive electrode connected to the first end of the second capacitor; The second capacitor includes a first end connected to the positive electrode of the diode and a second end grounded.

10. A display device, characterized in that, The display device includes the buck-boost control circuit according to any one of claims 1 to 9.

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